US 3224394 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
Dec. 21, 1965 R. DOBNER ETAL 3,224,394
MACHINE FOR SEWING BAGLIKE STRUCTURES AND THE LIKE Filed May 28, 1964 9 Sheets-Sheet l INVENTORS REM/H010 0OB/1/EIF, onme emu/v; Hf/A Z 4 715 A Tw V15 Y Dec. 21, 1965 DOBNER ETAL 3,224,394
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United States Patent 3,224,394 MACHINE FOR SEWING BAGLIKE STRUCTURES AND THE LIKE Reinhold Dobner and Oslrar Braun, Kaiserslautern-Pfalz, and Heinz Ulmer, Kirchentellinsfurt, Kreis Tubingen, Germany, assignors to G. M. Pfaif A.G., Kaiserslautern- Pfalz, Germany, a corporation of Germany Filed May 28, 1964, Ser. No. 370,769 Claims priority, application Germany, May 31, 1963, P 31,950 12 Claims. (Cl. 11210) The present invention relates to a machine for the sewing or fabrication of baglike structures and the like, more particularly, though not limitatively, structures of the type being closed along three sides and fitted with suitable closure means, such as pillow cases, blanket and the like cases made of flexible or pliable material (cloth, fabric, plastic, etc.) supplied in the form of a continuous web wound upon a supply roll from which blanks or work pieces of appropriate length are withdrawn intermittently, cut to the desired length and fed in succession to the hemming, sewing and associated operating stations of the machine.
Baglike structures having an open side, such as bags, sacks, pouches and the like have been manufactured in the past by withdrawing a blank of material from a supply roll, having a width equal to the length of the structures to be produced and having a length equal to twice the width of said structures, and cutting the withdrawn blank and folding the same about a symmetry line by the aid of a vertically moving, folding bar or plate. The folded work piece or blank having a vertical position is then returned to its horizontal position by the aid of inclined conveyer bands, whereupon a longitudinal seam is sewn by a first sewing machine along one of the lateral edges parallel to the feeding direction of the blank. The thus obtained work piece being closed at two sides, as a result of the folding and first sewing operation, is then fed at right angle to its original feeding direction to a second sewing machine disposed at right angle to said first machine, for the sewing of a seam along the still open side parallel to the new feeding direction.
Sewing arrangements of the foregoing type are suited for the fabrication of pouches, or similar bags of relatively small size or surface area, as disinct, for instance, from pillow or blanket cases or the like relatively large baglike structures. Besides, pillow and blanket cases must be hemmed along their outer, in particular cut, edges before folding and being sewn into the baglike structures. For this and other reasons they cannot be fabricated simply and economically by use of the prior methods or machines.
An important object of the present invention is, therefore, the provision of an improved and fully integrated machine or manufacturing assembly for the sewing of baglike structures, in particular, structures of relatively large size, such as pillow and blanket cases of both the open and closed type, though not limited thereto, said machine being substantially devoid of the shortcomings and defects inherent in the known devices or machines known according to the prior art.
Among the more specific objects of the invention is the provision of a machine or sewing assembly of the referred to type which is both compact in size and simple in construction, as well as efiicient in operation, whereby to allow of the frabrication of relatively large baglike structures or the like units or products economically and expeditiously; which machine will enable the size of the structures to be varied simply and readily without essential changes or readjustments; which will allow of the 3,224,394 Patented Dec. 21, 1965 sewing of either open or closed baglike structures in the course of the fully integrated step-by-step operation of the machine,
Yet another object of the invention is the provision of a machine or sewing assembly of the referred to type being characterized by the requirement of a minimum of mounting space, whereby to allow of the eflicient and expeditious fabrication of large pillow or blanket cases or the like structures or fabric pieces.
Another object of the invention is the provision of a fully automatic and integrated sewing apparatus or machine of the type referred to comprising a plurality of operating units or stations each designed to perform its individual function substantially separately from the other units, such as cutting, folding, hemming, sewing and turning of a workpiece initially withdrawn from a continuous web or supply roll, whereas all said units are operated step-by-step and in unison for the continuous fabrication of baglike structures or the like units, said machine being both simple and compact in design as well as economical and reliable in operation.
The invention, both as to the foregoing and ancillary objects as well as novel aspects thereof, will be better understood from the following detailed description of a preferred practical embodiment in conjunction with the accompanying drawings forming part of this specification and in which:
FIG. 1 is a perspective view of a complete integrated sewing assembly for producing baglike structures, constructed in accordance with the principles of the invention;
FIG. 2 is an end view of the work withdrawing, folding and cutting station of the machine according to FIG. 1, shown in the normal or starting position;
FIG. 3 is similar to FIG. 1, showing the operating parts in the work folding and cutting position;
FIG. 4 is a sectional view taken on line IVIV of FIG. 3;
FIG. 5 is a sectional View taken on line VV of FIG. 4;
FIG. 6 is a sectional view taken on line VIVI of FIG. 3;
FIG. 7 is a sectional view taken on line VII-VII of FIG. 6;
FIG. 8 is a schematic end view of the hemming station of the machine according to FIG. 1;
FIG. 9 is a more detailed and schematic view, showing the hemming mechanism on an enlarged scale in the starting position, the end position being indicated in dot-dash lines in the drawing;
FIG. 10 is a diagrammatic view more clearly showing the hemming tools of FIG. 9 in the starting position;
FIG. 11 shows the hemming tools in an intermediate position during a hem forming operation;
FIG. 12 shows the hemming tools in the end position;
FIG. 13 is a schematic view of the hem sewing station of FIG. 1;
FIG. 14 is an end view of the button and buttonhole sewing station of FIG. 1;
FIG. 15 is an end view of the work re-orienting and longitudinal seaming station of the machine of FIG. 1, shown in the starting position;
FIG. 16 shows the work re-orienting mechanism of FIG. 15 in the operative or end position;
FIG. 17 is a side view of the final station of FIG. 1 for inside out turning of the baglike structures produced;
FIG. 18 is a partial perspective view of FIG. 17 more clearly showing the turning mechanism for the small fold of the baglike structures;
FIG. 19 is a plan view of the turning mechanism of FIG. 18 in the starting position;
FIG. 20 is a view similar to FIG. 19, showing the turning mechanism in an intermediate operating position; and
FIG. 21 is a plan view showing the end position of the turning mechanism of FIG. 18.
Like reference characters denote like parts throughout the different views of the drawings.
With the foregoing objects in view, the invention, according to one aspect as shown by the drawings, involves the provision of a completely integrated sewing aggregate or machine for the sewing or fabrication of baglike structures of flexible or pliable material being fitted with closure means spaced from one edge thereof, in particular pillow and blanket cases, said machine embodying stationary hemming, hem sewing and buttonhole and button sewing machine units or devices for the fabrication of structures of varying size or length. This basic aim is achieved essentially, according to the invention, by the provision of means to clamp or hold the free end of a webof material, having been initially withdrawn from a supply roll, against a first horizontal supporting surface, of further means adjoining said surface to draw said web at right angle to said surface into a vertical U-shaped blank or workpiece, of means to hold or clamp the opposite end of the drawn off blank against a second horizontal supporting surface being parallel to and horizontally spaced from said first surface, and final means to cut said web at a point closely adjacent to said second surface, to thereby provide a workpiece in the form of a reversely bent blank of material disposed in a vertical position and having outwardly bent en'dportions overlying said' surfaces. The workpiece is fed successively by the aid of suitable feeding means operatively engaging said end portions at right angle to the original withdrawing direction, or in a direction parallel to the plane of the workpiece, to the hemming, hem-sewing, buttonhole and button sewing, longitudinal seaming and turning stations of the machine all being controlled or operated intermittently by a suitable program, switch mechanism, in such a manner as to result in the completed baglike structures being discharged from the output end of the machine, in the manner as will become further apparent as the description proceeds.
In the case of structures or cases fitted with buttonhole and button closure means spaced from an edge of the cases, the supporting surfaces of the bent end portions of the workpiece are advantageously disposed at different vertical heights or levels spaced from one another by a distance being equal to the sum of the widths of said end portions, that is, to provide a U-shaped workpiece having legs of unequal length. More specifically, in the latter case the buttonholes are sewn upon the end portion of the shorter leg of the workpiece and the buttons are sewn upon the end portion of the longer leg of the workpiece, to result in the proper cooperative relation upon finally turning inside out the completed structures, as will be further understood from the following description in reference to drawings.
The folded workpiece, being provided with transverse hems and fitted with buttons and buttonholes, is reoriented, prior to its feeding to the machines for the sewing the longitudinal seams, from its normally vertical to a horizontal operating position simultaneously with the turning over of the end portions into the plane of the workpiece. After the sewing of the longitudinal seams, the workpiece, including both a large and small fold, is turned inside out in a final turning station of the assembly, to result in a completed baglike structure with the seams and hems being invisible and with the buttons and buttonholes in proper cooperative relation to each other. I
In a machine of the referred to type, a variation of the length of the structures or size of the cases may be achieved simply and readily by a change of the stroke of the web Withdrawing means and the work folding means, substantially Witho t any change or readjfistments of the remainder of the machine, such as a change of position of the hemming devices, sewing machines, etc. As a consequence, the same machine will enable, for instance, the sewing of both pillow and blanket cases, or in general the withdrawing, hemming and cutting of blanks of any desired length from the web of material or supply roll.
In the realization of a machine of the referred to type, it is necessary to seize the depending free end of the web initially drawn off the supply roll and to operate the same to a position underneath a folding plate such as to assume a final position essentially at right angle to the referred to outer end portions of the cut blank or workpiece. Mechanism according to the invention for effecting the latter operation of an especially simple construction and involving the provision of a single swinging member for the re-orientation of the free end of the web, advantageously consists in the supporting member of the end of the web being rotatably mounted upon the end of a swinging arm being fitted with a sprocket which is engaged by a chain having its free ends affixed to a pair of stationary anchoring points, in such a manner that rotation of said arm through a predetermined angle will result in a rotation of said member from its initially vertical to a horizontal end position.
In the manufacture of pillow or blanket cases it is desirable, for esthetic and other reasons, to arrange the closure means at a distance from an edge of the structures. This requirement may be readily complied with by the invention by the formation of the U-shaped workpiece with unequal legs and by the mounting of the hemming devices, hem sewing machines and buttonhole and button sewing machines at different vertical heights or levels spaced by a predetermined distance in the manner pointed out hereinbefore.
Inasmuch as in the case of pillow and blanket cases the distance of the closure means from an edge of the cases remains the same, or is independent of the size of the cases, it is possible to sew cases of varying size With the aid of the machine according to the present invention substantially without readjustments of or change of the position of the sewing machines, as will be further understood from the description of the drawings.
From the foregoing as well as from the description which follows, it will be seen that the compactness or minimum mounting space required by a machine according to the invention is predicated principally on the carrying out of all the sewing and related operations, with the exception of the sewing of the longitudinal seams, in the folded vertical position of the workpiece and its feeding successively from one to the next operating station in a direction coinciding with the plane thereof, or at right angle to the direction of withdrawal from the supply roll.
In order to sew the longitudinal seams, it is necessary to re-orient or swing the workpieces from the vertical to a horizontal position, or to transfer a workpiece from a first conveyer to a second conveyer being at right angle to said first conveyer. This may be accomplished in a simple and efiective manner by the aid of a pair of vertical turnover plates enclosing the workpiece and being rotatable to a horizontal position.
In order to reduce the operating time, several of the operating steps may be carried out simultaneously. Thus, in order to turn the end portions of the workpiece to a position in line with the plane thereof simultaneously with the operation of the turnover plates, each of the latter may be fitted at its outer end with a folding flap controlled and operated by the swinging movement of the plates, in such a manner as to cause one of the flaps to form a prolongation of the associated plate and to cause the other flap to engage its associated plate in the case of closed structures, or that both flaps form prolongations of their associated plates in the case of open baglike structures, respectively.
Upon eompletionof'the sewing p ration the seams and hems must be rendered invisible by inside out turning of the structures. For this purpose, it is customary to utilize turning rails being inserted into the folds of the structures and cooperating with counter rails for the carrying out of the turning operations.
In accordance with the present invention, in a further elfort to increase the compactness and reduce mounting space, a drum-shaped turning device comprising sectorshaped turning rails is utilized, as shown and further understood from the following description of the drawings.
The machine for carrying into effect the invention as shown by the drawings comprises essentially a work withdrawal, folding and cutting station A, FIG. 1, a hemming station B, a hem sewing station C for producing a hem along the transverse or cut edges of a workpiece or blank withdrawn from a supply roll forming part of station A, a button and buttonhole sewing station D, a work reorienting station E, a further sewing station F for seaming the longitudinal edges of a folded workpiece, and finally a turning station G for turning the sewn baglike structures inside out so as to render invisible the longitudinal seams and the crosswise hems, in a manner as will become further apparent as the description proceeds.
More specifically, the work withdrawl and folding station A comprises a frame or support 1, FIG. 1, 2. and 3, rotatably supporting a supply roll 2 which carries a web of material to be operated on, such as cloth, fabric, plastic or the like flexible or pliable material. The web is withdrawn from the roll 2 by means of a drawoff roller 3 being driven by an electric motor 5 which is mounted upon a support or bracket 4 and serves to drive, by way of a sprocket 6, chain 7 and a further sprocket 8, a shaft 9 being journalled in the bracket 4 and carrying a pair of gears 10 located exteriorly of the web portion drawn off the roll 2. Disposed between the gears 10 and fixedly secured to the shaft 9 is a guide roller 11 for the web. The two gears 10 are each in meshing engagement with a counter gear (not shown) supported by a rocker arm 12 also mounted upon the bracket 4. Further disposed in line with said counter gears is a sprocket 13 which drives, by way of a chain 14 and sprocket 15, the draw-off roll 3 mounted upon the free end of the arm 12. Roller 3 is maintained in frictional engagement with the web by the action of a spring 16 having one end secured to the arm 12 and having its opposite end secured to the bracket 4.
Adjoining the frame 1 is a casing or support 17, wherein is journalled a shaft 18 carrying a supporting or pickup member 19 which has a pickup surface 20 extending over the entire width of the web indicated in dot-dash lines in the drawing. Fixedly connected to the shaft 18 is a sprocket 21 being driven, by way of a chain 22, by a driving motor 23 supported by the casing 17 and serving to swing or rotate the member 19 from an initial or starting vertical position, FIG. 2, to an operative or end (horizontal) position, FIG. 3.
Disposed laterally of the casing 17 at a predetermined spacing distance is a further casing or support 24 upon one side wall of which is mounted a further motor 25 being operably connected with a rocker arm 28 by way of an eccentric 26 and link 27, said arm having a horizontal axis journalled in the base of the support 24. Journalled within the upper end of arm 25 is a shaft 30 to which is connected a second pickup member 31 having a supporting surface 32 also extending across the entire width of the web. Both pickup surfaces 20 and 32 are, in the example shown, at different vertical heights in their operative or end positions, FIG. 3. Further secured to shaft 30 is a sprocket 33 engaging the bent end portion of a chain 34 formed into a U and having its free ends fixed at predetermined spaced points to the base of the support 24 or to a special supporting member 35 also supporting the rocker arm 28 in the example illustrated. As a consequence, rotation of the arm 28 about its shaft or pivot 29 results in the rotation of the pickup member 31 about its axis 30 due to the varying differential between 6 the legs of the chain 34 at different angular positions of the arm 28.
Disposed between the casings or supports 17, 24 is a vertical folding plate 36 (see also FIG. 1) having an upper end which terminates in a guide sleeve 37 slidable upon a vertical guide rod or post 38 supported by the casing 17. Sleeve 37 is fixedly connected to an endless vertical chain 39 which is driven by a motor 41 mounted upon the base of the machine by way of a driving sprocket 40 and a guide sprocket 42 mounted at the top of the casing 17, whereby, with the motor 41 rotating in one direction, the folding plate 36 performs an upward stroke and, with the motor 41 being rotated in the opposite direction, the plate performs a downward or work folding stroke, the latter being advantageously adjustable by the provision of means well known and understood.
Operably connected to the pickup member 31 is a drive unit 43 including a pair of guide pieces 45, FIGS. 4 and 5, which are provided with longitudinal openings or recesses adapted to receive the ends of a feed roller carrier 46. The ends of the latter are engaged by transverse pins 48 encircled by compression springs 47 and connected with or forming part of the armatures or plungers of a pair of electromagnetic solenoids or actuators 49. As a consequence, with the solenoids 49 being de-energized, the carrier 46 is urged in a downward direction by the springs 47 and will be retracted upwardly during energization of the solenoids, in a manner as will become further apparent as the description proceeds. The carrier 46 is fitted with feed rollers 50 spaced at predetermined distances from each other, one of the extreme feed rollers having a shaft 51 to which is secured a driving gear 52 adapted to mesh with, in the operative of horizontal position of the member 31, a pinion 53 being driven by a motor 54 mounted upon the support 24, to operate one or more endless work conveyor bands 55 disposed in the feeding direction of the machine.
Mounted upon the casing 17 is a further drive unit 44 being similar in construction to the unit 43. In the lowered position, the gear 52 of unit 44 meshes with the driving pinion 53' of an electric motor 54' being also supported by the casing 17, both units 43 and 44 being operated in synchronism in the manner described in further detail hereafter.
In order to cut a predetermined length from the Web 3', there is provided a rotary cutting knife 56, FIGS. 6 and 7, mounted within a support or casing 57 which is secured to the pickup member 19. Iournalled within the support 57 and exteriorly of the web 3 are a pair of sprockets 58 and 59 which are driven by an electric motor 60 and connected by a chain 61. Secured to the upper strand of the chain 61 is a supporting plate being fitted with four guide rollers 63 which run upon a pair of guide rails 64 disposed upon the inside surfaces of the casing 57. Continuously meshing with the lower strand of the chain 61 is a further sprocket 65 being secured to a shaft 66 which is journalled in the plate 62. Shaft 66 carries at its opposite end a gear 67 which meshes with a counter gear 68 secured to a shaft 69 also journalled in the plate 62 and carrying the knife 56.
The hem forming station B, FIG. 8, following the station A, comprises a pair of supports and 81 located on either side of the U-shaped workpiece or blank 3' supplied by the station A. The supporting surfaces or platforms 82, 83 for the end portions of the blank or workpiece 3', being located at different vertical heights in the example illustrated, are each provided at their undersurface with a hemming bar 84, FIGS. 9-12, to which is secured a folding plate 85 extending over the entire length of the blank 3, as viewed in the feeding direction, and having a width being about equal to the width of the hem to be formed.
The tools or devices for the forming of the double folded hems upon both the outwardly bent end portions of the blank 3' and the work feeding means are identical and symmetrical to one another. In the following, only one of the devices, that is, the right hand hemming device, as viewed in the feeding direction of the blank 3, will be described in detail in reference to FIGS. 9-12..
Secured to an intermediate wall 86 of the support 80,. FIG. 9, at a mutual spacing distance corresponding to the width of the workpiece 3, are a pair of vertical mounting plates 89 each being provided with a pair of guide grooves 87, 88 and having disposed therebetween the hemming tools 90, 91 proper which extend over the entire spacing distance between the plates 87, 88 and are provided with pushing plates or tongues 92, 93, respectively. The hemming tool 91 is fitted above its pushing tongue 93 with a retaining bar 94 and a cover plate 95 for the hem being formed, both the latter extending over the entire length of the tool 91. Both hemming tools 90, 91 are each provided in the vincinity of the plates 89 with two depending arms 96, 97 adapted to receive guide rods 98, 99 the end of which slide within the grooves 87, 88 of the plates 89, respectively, for the operation of the tools 90, 91.
Operation of the hemming tools 90, 91 is controlled by a pair of cams 100, 101 mounted upon a shaft 102 which is journalled in the plates 89 and driven by an electric motor (not shown). Cooperating with the cam 101 is a rocker arm 104 provided with a follower or scanning roller 103 and rotatably supported at one end by the wall 86. Jointed to the opposite end of the arm 104 is a bellcrank lever 105 to the arm 106 of which is, in turn, jointed a further rocker arm 108 having its opposite end rotatably supported by the wall 86. Furthermore jointed to the arm 107 of the bellcrank lever 105 is a link 109 which is, in turn, connected, by way of an intermediate link 110, to a further depending arm 111 of the hemming tool 91 being disposed intermediate the arms 97. A further link 112 connects the arm 111 with the vertex of the bellcrank lever 105.
The hemming tool 90 is similarly provided with a depending arm 113 disposed intermediate the arms 96 and being actuated by a link 114 by way of an intermediate link 115, the latter being, in turn, jointed to the arm 116 of a further bellcrank lever 117. Jointed to the vertex of the bellcrank lever 117 is a rock-er arm 119 also rotatably mounted in the wall 86 and fitted with a scanning roller 120 engaging the cam 100, while furthermore jointed to the vertex of the lever 116 is a link 121 having its free end connected with the arm 113 of the hemming tool 90. Connected to the arm 118 of the bellcrank lever 117 is a further rocker arm 122 also rotatably mounted upon the intermediate wall or support 86. Both scanning rollers 103 and 120 are each maintained in frictional engagement with. the respective cams 101, 100 by the action of springs 123 secured, respectively, to the wall 86, on the one hand, and to the arms 104, 119, on the other hand. In order to retain and feed the workpiece, there are provided upon each of the supporting surfaces 82, 83, FIG. 8, driving units 125, 126 operated by an electric motor 124, FIG. 1. The construction of the drives 125, 126 may be substantially similar to that of the drives 43, 44 of the station A, as will be understood. Since raising and lowering of the units is not required here, the solenoid actuators 49 of station A may be dispensed with in the hemming station.
The hem sewing station C, FIG. 13, is equipped with a pair of sewing machines 127, 128, being preferably of the type enabling both straight and Zigzag stitching and support-ed each by a frame or support 129, 130, respectively, the heights of the work-supporting surfaces 131, 132 of said machines corresponding, respectively, to the heights of the work-supporting surfaces of the hemming station B. Both sewing machines are followed by drive and feed units 133, 134, FIG. 1, which may be similar in construction to the drives 124, 125 of the hemming station E and which. are operated in synchronism with the sewing machines 127,128.
The buttonhole and button sewing station D, FIGS. 1 and 14, is equipped with a plurality of buttonhole sewing machines disposed adjacent to the end portion of the shorter leg of the folded work piece 3', the number of the machines corresponding to the number of buttonholes to be sewn in the pillow case or the like baglike structure to be produced. In place of separate machines as shown by the drawing, one or more multiple buttonhole sewing machines may be provided for the purpose of the invention with the number of buttonholes being either fixed or variable, in a manner well known and understood.
Disposed at the side of the machine opposite to the buttonhole sewing machines are a limited number, such as one half the number of the machines 140, of button sewing machines 141, inasmuch as the sewing of a button requires a considerably lesser time compared with the sewing of a buttonhole of corresponding size. The machines 141 may be mounted upon a slide (not shown) which may be displaced to the extent of one button spacing distance. Thus, assuming that six buttons are to be provided, there are sewn at first the first, third and fifth buttons. Subsequently, the machines are displaced by a button spacing distance for the sewing of the second, fourth and sixth buttons, in a manner readily understood. Both the buttonhole and button sewing machines may be of conventional construction and adapted to fully automatically sew a buttonhole or button, respectively, upon starting of the machines by a suitable switch or program device.
Disposed below each of the sewing heads of both the button sewing machines 141 and the buttonhole sewing machines 140, FIG. 14, is a drive or feed unit 142, 143 being similar in construction to the units 125, 126 of the hemming station B. The units 142, 143 are supported by a pair of brackets 144, 145, respectively, which are in turn secured, exteriorly of the'bent portions of the workpiece 3', to the frames 146, 147 supporting the machines 140, 141. The units 142, 143 are each driven by an electric motor (not shown), in a manner similar to the drive units of the preceding stations.
The work-re-orienting station E, FIGS. 1, 15, 16, comprises a pair of frames or supports 160, 161 between which are disposed a pair of turnover plates 162, 163. The supports 160, 161 are spaced from one another such as to enable ready passage of the folded Work pieces. The plates 162, 1 63 are connected with one another exteriorly of the workpiece at their right hand edges, as viewed in FIG. 1, plate 163 is fitted with bearing brackets 165 adapted to receive a shaft 164 which is fixedly secured to the support 161 and carries a sprocket 166 located exteriorly of the workpiece and secured to one side of the bearing-165 of the plate 163. As a consequence, the sprocket 166 rotatestogether with the plates 162 and 163 about the stationary axis 164, said sprocket being driven by an electric motor 167 mounted upon the base of the support and carrying a driving sprocket 168 operably connected with the sprocket 166 through a chain 169. Each of the turnover plates 162, 163 is fitted at its upper end with a rotatable folding flap 170, 171 which extends over the full width of the workpiece, both said flaps having a horizontal position inthe vertical position of the plates 162, 163, FIG. 15, with the height of the respective work-supporting surfaces corresponding to those of the work-supporting surfaces of station D.
Both flaps 17 0, 171 are hinged, exteriorly of the workpiece 3', with the associated turnover plates 162, 163, in such a manner as to enable rotation thereof to a position as shown in FIG. 16, that is, in line with said plates, forthe purpose as will become more apparent from the description of the operation of the device. In order to effect rotation of the flaps 170, 171, by the plates 162, 163, there are provided a pair of sprockets 172, 173 being fixedly secured to shaft 164 and located exteriorly of the workpiece adjoining the right hand end ofthe latter, said 9 Sprockets being engaged by chains 174, 175, respectively. Chain 174, in turn, engages a further sprocket 176 secured to a shaft 177 which is rotatably mounted in the plate 162. Further connected to the shaft 177 is the flap 170. As a consequence, rotation of the plates 162, 163 about the axis 164 will result in the flap 170 being swung relative to the plate 162 from the (horizontal) position according to FIG. 15 to a position as shown by FIG. 16.
The chain 175 cooperating with the sprocket 173 engages at its upper end a further sprocket 178 which is secured to a shaft 180 supported in an extension 179 of the plate 163. Further secured to the shaft 180 and laterally of the sprocket 178 is a gear 181 which meshes with a counter gear 182 being in turn secured to a shaft 183 rotatably mounted in the plate 183. Further connected to the shaft 183 is the turnover flap 171. As a consequence, the flap 171 will be rotated relatively to the plate 163 from the position shown in FIG. 15 to the position of FIG. 16 as a result of the rotation of the plates 162, 163 about the axis 164 and by virtue of the relative motion between the chain 175 and the sprocket 173,
Mounted upon each of the supports 160, 161 is a driving unit 184, 185 the construction of which is identical to the unit 43 of the station A, FIG. 4. Both the turnover plates 162, 163 and the folding flaps 170, 171 are fitted with suction tubes 188 which serve to retain the workpiece 3' between the plates 162, 163 or against the flaps 170, 171, respectively, in the raised position of the driving units 184, 185. Secured to the undersurface of the cover plate 189 of the support 161 is a motor 190 which serves to drive a number of feed rollers 194, being distributed over the entire width of the workpiece, by way of a driving sprocket 191, a chain 192 and counter sprocket 193, said rollers serving to withdraw the workpiece from the station E in cooperation with a number of further feed rollers 195 supported by the turnover plate 162 and also being distributed over the entire width of the workpiece.
The station F for the sewing of the longitudinal seams is equipped with a pair of sewing machines 200, 202, FIG. 1, preferably of the type for selective straight and zigzag stitching and each being supported by a frame 202, 263, respectively. In order to ensure a smooth transition of the workpiece from the station E to the station F, the work-supporting heights of the machines 200, 201 coincide with the heights of the upper edge of the turnover plate 162 in its raised or end position, FIG. 16. The machines 200, 201 are operated synchronously with the continuously rotating rollers 194 with the machines being connected and disconnected intermittently in accordance with the operating cycles or program of the machine.
The work turning station G following the sewing station F, FIG. 1, comprises a number of juxtaposed conveyor bands 210, FIG. 1, being arranged at the height of the work-supporting surfaces of the machines 200, 201, said bands being driven through rollers 211 secured to a shaft supported by the inside walls 212, 213 of the support 214, FIG. 17, by an electric motor (not shown). The turning inside out of the small fold of the workpiece or baglike structure leaving the station E is effected by a pair of turning units or devices 216, 217 being disposed adjacent to the machines 200, 201. Inasmuch as the construction of both turning devices 216, 217 arranged at a distance equal to the width of the workpiece is the same, only the right hand unit 216, as viewed in FIG. 1, will be described in detail in the following.
As can be seen from FIG. 1, there is arranged upon the side wall 212 at the height of the conveyer bands 210 a supporting plate 218 (see also FIGS. 17 and 18) upon which is rotatably mounted laterally of the workpiece a vertical bolt 219 carrying a sprocket 220 at its upper end which is driven by an electric motor 222 mounted upon the side wall 212. Rotatably mounted upon the bolt 219 below the sprocket 220 is a gripping tongs device 223 having a pair of offset inner legs 224, 225 whose front ends 226, 227 entering the baglike structures to be turned are urged towards one another by the action of a spring 230 arranged between the legs 224, 225 of the device.
In order to provide a minimum spreading angle of the legs 226, 227 of the unit 223 in the starting position, to ensure a safe entry into the baglike structure, the plate 218 has afiixed to it a pin 231 being engaged by the end 228 of leg 225. The end 229 of leg 224 of the unit 223, engages in the starting position as shown in FIGS. 18 and 19, a pin 232 depending from the disk 233 secured to the bolt 219, whereby said pin is rotated together with said disk 233. Mounted upon a further bolt 234, FIG. 21, and extending from the supporting plate 218 is a double lever 235 whose vertical distance from the plate 218 is equal to the vertical distance between said plate and the leg 229 and whose one end cooperates with the leg 229, while its opposite end is jointed to the end of a pushing rod 236 of an electromagnet or solenoid 237 also supported by the plate 218. In order to facilitate the entry of the leg 226 into the fold of the baglike structure to be turned, there is provided at a slight vertical distance from the conveyer bands 210 a suction tube 238, FIGS. 1 and 17, extending over the entire width of the workpiece.
Disposed between the turning devices and the right hand end of the conveyer bands 210, FIG. 17, is a reversing bar 239 also extending over the entire width of the workpiece and having its downturned ends secured to the side walls 212, 213. This bar serves to return the turned small fold of the structures overlying the large fold upon turning, into a horizontal position and in line with the large fold, in the manner as will be further understood from the following.
The turning of the large fold of th workpiece is effected, in accordance with the improvements of the present invention, by the aid of a turning drum 240, FIG. 17, being rigidly mounted upon a shaft 241 which is secured to the side walls 212, 213. The drum 240 has its circumferential surface fitted with a plurality of suction tubes 242 which serve to retain the workpiece fed by the bands 210 upon the drum.
Disposed laterally of the conveyer bands 210, yet within the area of the work are a pair of sector-shaped turning rails or bars 243 having essentially a recumbent U-shaped cross-section and being supported by an arm 244 rotatably mounted upon the shaft 241. Disposed laterally of and connected with the arm 241 is a sprocket 245 being freely rotatable upon the shaft 241 and driven through a chain 246 by an electric motor 247 mounted upon the support 214. Disposed slidably within each of the turning rails 243, FIG. 1, is a further turning rail 248 being supported by an arm 249 also freely rotatable upon the shaft 241. Disposed laterally of and mounted upon the arm 249 is a sprocket 250 being driven by way of a chain 251 by .a further electric motor 252 also mounted upon the support 214. Further disposed at the right hand side of the conveyer bands 210, as viewed in FIG. 1, is a suction tube 253 extending over the entire Width of the drum 240 and serving to slightly lift the upper layer of the baglike structures at the instant of insertion of the turning rails into the larger fold of the structures, to ensure a safe entry and smooth operation of the device.
In the following will be explained the operation of the machine shown and described in the foregoing.
Let it be assumed that the free end of the web or Workpiece 3, as indicated in dot-dash lines in FIGS. 2 and 3, has been withdrawn manually so as to overlie the guide roller 11 prior to the starting of the machine. Upon starting of the motor 5, the web of material is withdrawn from the supply roll 2 by the drawoff roller 3 such that the free end of the web extends to the end of the surface 32 of the supporting member 31. The solenoids 49 of the drive unit 43 are then energized, whereby to cause the carrier 46 to be displaced towards the surface 32 by the action of the springs 47. As a consequence, the end of the web is firmly clamped against the surface 32 by the rollers 50 and the conveyer band 55, the latter being still at rest at this stage of the operation. Subsequently, the motor is started, whereby the eccentric 26 performs one half revolution, thereby causing the rocker arm 28 to be rotated from the position of FIG. 1 to the position of FIG. 3. As a result, of this rotation of thearm 28, the sprocket 33 supported by the shaft 30 is caused to rotate through a quarter revolution by virtue of the relative variation of the lengths of the strands of the chain 34, whereby the supporting member 31 normally pointing in a downward direction will be operated to a horizontal position, while at the same time the gear 52 is moved into operative position relative to the pinion 53 of the motor 54, as shown by FIG. 3. At the same time, the supporting member 19 driven -by the motor 23 performs a quarter revolution, whereby also to be operated to a horizontal position, as shown in FIG. 3. Subsequently, the folding bar 36 driven by the motor 41 by way of the chain 39, performs its downward or operating stroke, whereby to withdraw a corresponding length of material from the supply roll 2 and to simultaneously reversely bend or fold the withdrawn web portion or blank 3'. Upon completion of the downward movement of the folding bar 36, the solenoids 49 of the device 44 are deenergized, whereby to cause the rollers and band to be lowered, or the workpiece to be clamped against the surface 19, as well as to cause the gear 52' to operatively engage the pinion of the motor 54. In order to cut the withdrawn length of material, motor is now started, whereby to displace the supporting plate 62 in a direction transverse .to the web 3 by way of the chain 61 and to rotate, through gears 67, 68, the sprocket 65 engaging the lower strand of said chain, and, in turn, the cutter 56. The web is thus cut from the supply roll to the desired length determined by the stroke of the folding bar 36, which may be adjustable for the sewing of baglike structures of different length.
After the cutting operation, the folded or U-shaped workpiece 3 with its unequal and outwardly bent leg portions is fed in a direction at right angle to the direction of withdrawal from the roll 2 by means of the drive units 43, 44 operated by the motor 54, whereby the ends of the blank are retained between the supporting surfaces 20 and 32 and the bands 55 and the blank is fed to the hemming station B. Simultaneously with the starting of the drives 43, 44 of station A, the drive units 125, 126 of station B are set in motion, to advance the leading edge ofthe workpiece 3' up to the front end of the station B at which instant the units 125, 126 are arrested.
While thus positioned in the hemming station B, the transverse edges of the workpiece, FIGS. 8 and 9, are formed with a double-folded hem. Inasmuch as both hems are identical, only the formation of the right hand hem, as viewed in FIG. 1, will be described in detail in the following in reference to FIGS. 8-12.
In FIGS. 9 and 10 both hemming tools are shown in the starting position with the outwardly bent ends of the workpiece 3 projecting beyond the supporting surface 82 to an extent necessary for the information of a doublefolded hem. The cams 100, 101 driven by shaft 102 are now started to rotate in the direction of the arrow, whereby the tool 91 is at first operated horizontally towards the left and subsequently in a slanting downward direction and again horizontally in accordance with the design of the associated cam 101 and guide groove 87. At the end of this movement, the hemming tool 91 assumes the position shown in FIG. 11, wherein the hemming bar 94 engages the edge of the hemming plate 84, the cover plate 95 engages the upper horizontal portion of the hem, and the pushing tongue 93 engages the underface of the horizontal hem portion, respectively. During this partial rotation of the shaft 102, the scanning roller 120 engages the concentric section of the earn 100, whereby to retain the hemming tool 90 in. the rest position,
Upon reaching the position shown by FIG. 11, the roller 103 engages the concentric section of the cam 101, thus arresting the movement of tool 91. On the other hand, the tool 90, during the continued rotation of the shaft 102, is operated at first horizontally towards the right and subsequently in a slanting upward direction and finally again horizontally in accordance with the shape or design of the eccentric section of the cam and of the guide groove 88, as will be understood. During this movement, the pushing tongue 92 seizes and raises the end portion of the workpiece projecting beyond the tongue 92, to result in the final hemming position of the tool, as shown in FIG. 12.
In the last referred to position of the hemming tools 90, 91, the shaft 102 is arrested whereupon the motor 124, FIG. 1, is started, whereby to operate the drive units 125, 126, to advance the workpiece 3' to the hem sewing machines 127, 128 having been started at the proper instant. Simultaneously with the sewing machines 127, 128, the drives 133, 134 of station C are set in motion, to advance the workpiece 3' to the buttonhole and button sewing station D. Upon reaching the latter, the drives 133, 134 are arrested and the drives 142, 143, FIG. 14, set in motion. The latter serve to properly position the workpiece 3 underneath the machines 140, 141 for the sewing of the buttonholes and buttons, respectively, whereupon units 142, 143 are arrested and the sewing machines 140, 141 started. As a consequence, the buttonhole sewing machine automatically sews a predetermined number of buttonholes upon the outwardly bent and portion of the shorter leg of the U-shaped workpiece, while the butt-on sewing machine 141 at first sews one half of the buttons and then the other half after lateral displacement of the machines, in the manner explained hereinbefore.
Upon completion of the buttonhole and button sewing operations, the machines 140, 141 are arrested and the drives 142, 143 set in motion to advance the workpiece 3, in cooperation with the lowered drive units 184, 185, to the end of the reorienting station F in which position the bent end portions of the blank engage the folding flaps 170, 171, respectively. The drives 142, 143 and 184, 185 are then arrested and vaccum or underpressure applied to the suction tubes 188, to retain the workpiece in a vertical position between the turnover plates 162, 163 and to clamp it against the flaps 170, 171. The solenoids 49 of the drive 184, 185 are then energized, to withdraw the drives from the workpiece, whereupon the motor 167 is started to operate the plates 162, 163 from the position of FIG. 15 to the position of FIG. 16.
During the swinging movement of the plates 162, 163, the suction tubes 188 of the plate 163 are disconnected or disabled, whereby the folded workpiece adheres the plate 162. A a further result of the swinging movement of the plates 162, 163 and due to the stationary position of the sprockets 172, 173, the line of contact between the chain and sprocket 173 vary in such a manner as to cause rotation of both the gear 182 and sprocket 176. As a consequence, the flaps 170, 171 are rotated or swing to the positions shown by FIG. 16 relative to the plates 162, 163, whereupon at first the suction tubes 188 of the flap 171 and subsequently all the suction tubes 188 of the station E are disconnected. The ends of the workpiece 3' initially bent outwardly are thus swung into a horizontal position or in line with the main portion of the workpiece, that is, the bent end of the shorter leg of the workpiece is rotated by an angle of 90 in a direction away from the folded end of the workpiece While the bent end of the longer leg of the workpiece is rotated by an angle of in a direction towards said folded end, respectively. Subsequently, the driven rollers 194 seize the leading end of the workpiece overlying the rollers 195, whereby to feed the same in a direction at right angle to its preceding movement, or parallel to the direction of the initial movement or withdrawal from the roll 2, to
13 the sewing machines 200, 201 for the longitudinal seaming of the still open sides of the workpiece.
During the sewing of the longitudinal seams, the leading end of the now completely closed workpiece engages the conveyer bands 210 being driven in synchronism with the machines 200, 201. Upon completion of the sewing operation and stoppage of the machines 200, 261, the bands 210 continue to advance the workpiece to a position coinciding with the right end of the bands, FIG. 17. During this feed movement, the leading end of the small fold of the workpiece reaches the suction tube 238 (position according to FIG. 18). Suction is applied briefly, whereby to lift the upper layer of the workpiece and to enable the legs 226 of the turning tongs 216, 217 to enter the small fold, as shown in FIG. 19. At this instant, the conveyor bands 210 are arrested. Since both turning units 216, 217 are identical, only the operation of the unit 216 will be described in detail in the following.
After the leg 226 has entered the small fold of the workpiece, FIG. 19, the motor 222 is started, whereby to rotate the pin 232 about the bolt 219 by way of the disk 233. During this rotation of the bolt 219, the pin 232 moves counterclockwise until engaging the leg 228 of the gripping tongs 223. As a consequence, the spring 230 acts on the now freed leg 229, whereby to cause the legs 226, 227 to approach one another. The pin 233 which now engages the leg 228 causes rotation of the latter in ,the counterclockwise direction, whereby the spring 230 further acts to bring up the leg 229 such as to grip the side edge of the small fold of the workpiece by the legs 226, 227. During continued rotation of the pin 232, the tongs 223 are operated through an intermediate position, FIG. 20, to a final position, FIG. 21, whereby to cause the leg 226 initially inserted in the small fold to be withdrawn and to cause the leg 227 to be inserted in the fold, to thereby turn the same inside out, as shown in FIG. 21. At the end of the movement of the tongs 223, the solenoid 237 is energized, whereby to cause its push rod 236 to rotate the double lever 235 in counterclockwise direction and to open the tongs 223. At this instant, the conveyor bands are restarted, to advance the workpiece to a position of full engagement of its large fold with the turning drum 140 in which position it is retained by the action of the suction tubes 242. During this latter movement, the previously turned small fold overlying the large fold of the workpiece reaches the reversing bar 239 to be raised thereby and returned to a position in line with and adjoining the large fold of the workpiece.
In order to turn the large fold of the workpiece, suction is at first applied briefly to the tube 253, FIGS. 1 and 17, to raise the end of the large fold being fitted with a row of buttons sewn previously, whereupon the motor 247 is started. The latter rotates the turning rails 243, FIG. 17, in clockwise direction by way of the chain 246, whereby to cause said rails to enter the large fold of the workpiece to an extent determined by the fold produced by the bar 36 of station A. The motor 247 is now arrested and the motor 262 started, whereby to rotate the turning rail 248 counterclockwise. As a consequence, the latter by entering the workpiece in the opposite direction causes the turning inside out of the large fold, whereby to complete the turning operation of the baglike structure produced step-by-step from the original blank or web portion 31 drawn off and cut from the roll 2.
Inasmuch as the operating time of the stations AG varies considerably, in that for instance the sewing of the buttonholes in station D takes a much longer time than the hemming operation in station B, the control of the machine is advantageously such that each station has its own independent operating program controlled by a suitable sequence or program switch or mechanism, and that the stations are operated in unison and intermittently during successive operating periods or cycles determined by the longest operating time of any one station. After all the simultaneously started stations have completed their individual operations, each workpiece is fed to the next following station and all the operations re-started for the carrying out of the next following operating cycle.
In initially starting the machine by the withdrawal and folding of the first blank or workpiece in station A, the machine is unable to automatically transfer to the next operating cycle, since the following stations B, C are still in their rest position. This makes it necessary to effect the transfer manually step-by-step until the last station (G) has been charged with a workpiece and set into operation. From here on the machine will operate automatically, whereby each station performs its own function independently of the preceding and following stations and is arrested by its control device upon termination of its respective operation. The machine is then advanced by one step, whereby the workpiece in station A is fed to station B and the workpiece in the latter is fed to station C, and so on, whereupon all the stations are re-started simultaneously for the carrying out of the next following operating cycle. In other words, there will be a workpiece being operated on at any time in all the stations, or a complete baglike structure will be in the last (turning) station while a blank is withdrawn from the supply roll in the first (folding) station.
In the foregoing the invention has been described in reference to the separate operating movements of the component parts or devices, it being understood that the parts or tools are returned to the starting positions by polarity reversal or continued rotation of the driving motors, to enable a repeated operationof the machine in successive cycles under the control of a suitable program switching mechanism, in a manner readily understood by those skilled in the art.
Furthermore, while the invention has been described in the foregoing in reference to the sewing of closed baglike structures, such as pillow cases, blanket cases, or the like, it is understood that the improvements presented may be used with equal advantage for the manufacture of equivalent structures or units of any size and made of any suitable flexible or pliable material, both with or without any special closure means. Thus, in the absence of the latter, the buttonhole and button sewing machines of station D may be dispensed with and the bent ends of the workpiece or blank 3 may be at the same heights while passing through the machine. If the hemmed edges of the workpiece are in register, as in the case of open pillow or the like structures, the folding flaps are modified such as to cause the outwardly bent ends of the workpiece to be both swung through angles of or to be in line with the main portions of the workpiece, in a manner readily understood. Finally, the invention, according to a further simplified embodiment, may be utilized with advantage for the simple hemm-ing of sheets, such as table cloths, bed sheets or the like, by the provision of operating stations A, B, and C only, to enable a continuous manufacture and hemming of the sheets or blanks drawn and cut from a supply roll, in the manner described. The advantage, among others, of such an arrangement or method resides mainly in the considerably reduced space of the cutting and hemming devices due to the bent or folded condition of the workpiece or blank while being operated on. This, in turn, allows of the manufacture of relative large sheets of either simple or baglike form to be produced efficiently and expeditiously. In the case of the fabrication of baglike structure, stations E, F, and G have to be merely added to the stations A, B, and C serving for simple hemming only.
In the foregoing, the invention has been described in reference to a specific illustrative device or machine. It will be evident, however, that variations and modifications, as well as the substitution of equivalent parts and devices for those shown herein for illustration, may be made in accordance with the broader scope and spirit of the invention, as encompassed by the appended claims. The
specification and drawings are accordingly to be regarded in an illustrative rather than in a restrictive sense.
1. A machine of the character described comprising in combination:
(1) means to temporarily hold the end portion of a web of flexible material withdrawn from a supply roll against a first horizontal supporting surface,
(2) folding means disposed closely adjacent to said surface to draw off and reversely bend a blank of predetermined length from said roll,
(3) means to hold the opposite end portion of the drawn oif blank against a second horizontal supporting surface,
(4) means to transversely out said web at a point closely adjacent to said second surface, to provide a U- shaped workpiece having a pair of vertical leg portions depending from said end portions overlying said surfaces,
(5) a pair of hemming devices having stationary hemming plates each adjoining and being in line with one of said supporting surfaces,
(6) a pair of hem sewing machines each adjoining the end of one of said hemming devices, and
(7) work feeding means operably engaging said end portions, to successively feed a workpiece in its vertical position and in a direction parallel to the plane thereof to said hemming devices and said hem sewing machines, to form and sew a hem along the edges of both said end portions.
2. A machine as claimed in claim 1, including a reorienting device with means to feed thereto a workpiece emerging from said hem sewing machines, to operate said workpiece from its vertical to a substantially horizontal operating position, a pair of further sewing machines disposed in spaced relation to one another and at right angle to said hem sewing machines, further means to feed the re-oriented workpiece to said further sewing machines, to sew a pair of seams along the longitudinal edges of said workpiece, to produce a closed baglike structure, and a device for turning inside out said structure fed thereto upon passage through said further sewing machines.
3. A machine as claimed in claim 1, said first holding means being comprised of a swinging lever rotatively supporting a supporting member at its free end having a vertical surface adjoining the end portion of said web initially withdrawn from said roll, means to clamp the end of said web against said member, and operating means to rotate said lever to an operative position and to simultaneously rotate said supporting member about the end of said lever from its vertical to its horizontal operative position.
4. A machine as claimed in claim 3, said operating means being comprised of a sprocket connected to said supporting member and a chain engaging said sprocket and having its ends anchored at spaced fixed points near the fulcrum of said lever.
5. A machine as claimed in claim 3, said second holding means being comprised of a second rotatively mounted supporting member having a fixed pivot and a vertical surface initially adjoining a portion of said web spaced from said end portion, and means to rotate said second member from its vertical to a horizontal position in operative relation to said first member.
6. A machine as claimed in claim 3, said folding means being comprised of a vertically operable folding plate closely adjoining said supporting member in the operative position, said second holding means being comprised of a second rotatively mounted supporting member having a stationary pivot and a vertical surface initially adjoining a portion of said web spaced from said end portion, means to rotate said second member from its vertical to a horizontal position in operative relation to said first member, and said cutting means consisting of a circular cutting knife rotatively supported by said St COI Q membe to cut said web, in the operative position of said second member, at a point closely adjoining the supporting surface of said second member.
7. A machine for the fabrication of baglike structures comprising in combination:
(1) means to temporarily hold the end portion of a web of flexible material withdrawn from a supply roll against a first horizontal supporting surface,
(2) a vertically operable folding plate disposed closely adjacent to said surface, to draw off and reverselybend a blank of predetermined length from roll,
(3) means to hold the opposite end portion of the drawn off blank against a second horizontal supporting surface,
(4) means to transversely out said web at a point closely adjacent to said second surface, to provide a U- shaped workpiece having a pair of vertical leg portions depending from said end portions overlying said surfaces,
(5) a pair of hemming devices having stationary hemming plates adjoining and being in line with said supporting surfaces, to fold and hem the edges of said end portions,
(6) a pair of first sewing machines each adjoining the end of one of said hemming devices for the sewing of said hems,
(7) a work re-orienting device to turn a workpiece upon passing said sewing machines from its vertical to a substantially horizontal operating position and to simultaneously turn said end portions into the planes of the respective leg portions of said workpiece,
(8) a pair of further sewing machines disposed in spaced relation to one another and at right angle to said first sewing machines for the sewing of a pair of longitudinal seams upon the workpiece after passing said re-orienting device, to produce a closed baglike structure,
(9) a turning device for inside out turning said structure, and
(10) work feeding means operably engaging said end portions, to successively feed a workpiece, in its vertical position and in a first feeding direction in line with the plane thereof, to said hemming devices, said first sewing machines and said re-orienting device, and to thereafter feed said workpiece in its re-oriented horizontal position and in a feeding direction at right angle to said first feeding direction, to said second sewing machines and said turning device.
8. A machine as claimed in claim 7, including sets of button-and-buttonhole sewing machines disposed between said first sewing machines and said re-orienting device, to sew a series of buttons upon one of said end portions and to sew a series of corresponding buttonholes upon the other of said end portions.
9. A machine as claimed in claim 7, said first and second supporting surfaces and the associated hemming devices and first sewing machines being at different vertical heights spaced by a distance about equal to the sum of the widths of said end portions, to result in workpiece having unequal leg portions and in a baglike structure emerging from said further sewing machines having both small and large folds, and said turning device adapted to separately turn the small and larger folds of said structure in succession.
10. A machine as claimed in claim 7, said first and second supporting surfaces and the associated hemming devices and first sewing machines being at different vertical heights spaced by a distance about equal to the sum of the widths of said end portions, to result in a workpiece having unequal leg portions and in a baglike structure emerging from said further sewing machines having both small and large folds, and sets of buttonandbuttonhole sewing machines disposed between said first sewing machine a d id rt -or en i g evi e, to sew a er e of buttonholes upon the end portion of the shorter leg portion of said workpiece and to sew a series of corresponding buttons upon the end portion of the longer leg portion of said workpiece, said turning device adapted to separately turn said small and larger folds in succession, whereby to result in a final baglike structure fitted with a line of buttons and corresponding buttonholes being spaced from one side of the structure.
11. A machine as claimed in claim 7, said re-orienting device comprising a pair of spaced parallel turning plates adapted to receive the U-shaped workpiece therebetween, means to simultaneously rotate said plates from a vertical to a substantially horizontal position, each of said plates being fitted with a flap at one end engaging one of the end portions of said workpiece and rotatable in response to the rotation of said plates, to turn said end portions from their position at right angle into a position coinciding with the plane of the respective leg portions of said workpiece.
References Cited by the Examiner UNITED STATES PATENTS 3/1956 MacIsaac 1122 8/1956 MacIsaac 1l22 JORDAN FRANKLIN, Primary Examiner.