US 3021652 A
Description (OCR text may contain errors)
Feb. 20, 1962 Filed July 21, 1959 s. GREISMAN v BAG SEALING MACHINES 5 Sheets-Sheet 1 lgento r Ba fi rm Attorney Feb. 20, 1962 Filed July 21, 1959 S. GREISMAN BAG SEALING MACHINES 5 Sheets-Sheet 2 Attorney Feb. 20, 1962 s. GREISMAN 3,021,652
BAG SEALING MACHINES Filed July 21, 1959 5 Sheets-Sheet 5 Inventor g iwzig A ftorney Feb. 20, 1962 Filed July 21, 1959 S. GREISMAN BAG SEALING MACHINES 5 Sheets-Sheet 4 Feb. 20, 1962 s. GREISMAN 9 5 BAG SEALING MACHINES Filed July 21, 1959 5 Sheets-Sheet 5 69- 4 70/1 //2 y I w a Attorney This invention concerns a new or improved machine for hermetically sealing bags, sacks and the like, and has particular reference to a machine for applying flexible adhesive strip over the mouths of paper, plastic (e.g. polythene) and like bags, hermetically to seal the same, the
red seas Fatcnt said adhesive strip preferably being of the self adhering type.
According to this invention there is provided a bag sealing machine comprising guide means along which the mouth of a bag to be sealed may be passed, means for supplying a flexible sealing strip bearing adhesive on one side to a sealing station along said guide means, means for folding said strip along a longitudinal line upon itself and over the mouth of said bag prior to the latter reaching said sealing station, and feed means for feeding the bag mouth and said sealing strip through the machine and for pressing the folded over sealing strip on to opposite sides of such bag mouth.
Said feed means may conveniently comprise a pair of feed rollers, which may be serrated or fluted, between which the bag and the folded over sealing strip pass. These feed rollers may be resiliently urged together and means may be provided for separating them to facilitate feeding the sealing strip initially into position between them.
According to a further feature of the invention, power operated means are provided for driving said feed means, and trip means are preferably provided for automatically interrupting said drive at the completion of a bag sealing operation.
Means are preferably also provided for severing the sealing strip immediately to the rear of each sealed bag, and according to a still further feature of the invention the said severing means are preferably automatically operated through the same trip means as are employed for interrupting the drive to the said feed means, the severing of the sealing strip and the interruption of the feed being preferably eifected simultaneously.
The said trip means may conveniently be positioned to be engaged, when the trailing end of the bag has passed through said feed rollers, by that hand by which an operator holds the leading upper corner of the bag and desirably the said trip means may be adjustable in position according to the width of bag to be sealed by the machine.
According to a further feature of the invention, means may advantageously be provided for incorporating a tearing thread in the said sealing strip prior to, or at the same time as, the latter is applied to a bag.
In machines, such as the bag sealing machine according to this invention, for operating on objects, especially relatively heavy objects, in which the objects are required to be moved relatively to the operating part of the machine as the operation is being effected, it is usual for the operating part of the machine to be placed at a convenient height for the operator and for a supporting surface to be pro- ,vided for the objects at a height convenient to bring the appropriate part of the object to the level of the'operating part of the machine. Where the object is of the correct height, the said supporting surface may, of course, be the floor or base surface on which the machine itself stands. When it is desired to use such a machine for objects which have a height less than that for which the machine is basically designed, it is necessary either for the operator to raise the object by hand and maintain it in its raised ice position while he moves the object relatively to the operating part of the machine, or alternatively for a table or the like to be placed on the normal supporting surface to provide a new supporting surface at the correct height. Where it is required that the machine should be usable for operating on objects of many different heights, it is necessary for a plurality of tables to be provided.
It is a further object of this invention to provide, in such a machine, means which will enable the machine to be used with objects of different sizes without the necessity for the operator having to support the object in a raised position as he moves it through the machine or for the provision of a plurality of tables of different heights.
Thus, according to a further aspect of this invention, there is provided a machine for performing an operation on objects which are required to be moved relatively to'an operating part of the machine and including an object support comprising a carrier mounted for guided movement relatively to the machine along the path along which the objects are required to be moved and an object supporting platform mounted on said carrier so as to be adjustable thereon to 'vary the distance of such platform from the level of the said operating part of the machine.
It will be appreciated that the said platform may be adjusted on the carrier to suit the height of the object upon which the operation is to be effected so that the appropriate part of the object will, when the latter is supported on the platform, be at the correct height for operation thereon and that the mountingv of the carrier enables an object, when supported on the said platform, to be readily moved relatively to the machine without causing fatigue to the operator.
Conveniently, the said path of movement of the carrier is defined by two spaced rails, and the carrier is provided with rollers adapted to engage and run along the said rails. According to a further feature of this invention, the said carrier may be provided with two spaced parallel slots extending between upper and lower parts of the carrier and the said platform mounted on the carrier by locking elements, e.g. bolts, passing through the said slots so that adjustment of the platform may be achieved by sliding of the said elements along the said slots.
In order that this invention may more readily be understood, reference will now be made by way of example to the accompanying drawings in which:
FIGURE 1 is a perspective view of a machine according to this invention for hermetically sealing bags, sacks and the like;
FIGURE 2 is a rear elevation of the machine of FIG- URE 1;
FIGURE 3 is an enlarged perspective view of the upper part of the machine of FIGURE 1;
FIGURE 4 is a fragmentary rear elevation showing the bag support of the machine;
FIGURES 5 and 6 are fragmentary rear and side ele vational views respectively showing the mounting of the box-like housing of the machine;
FIGURE 7 isa fragmentary front elevation of the machine with the front plate of the housing removed;
FIGURES 8 and 9 are cross-sections on the line AA of FIGURE 7; the mechanism inside the housing being shown in two different positions;
FIGURE 10 is a fragmentary cross-section through the housing; and
FIGURE 11 is a fragmentary section through the mouth of a bag sealed using the machine of FIGURES The machine illustrated comprises a stand 1 which is conveniently of rectangular form in plan and comprises a rectangular top plate 2 from each corner of which extends downwardly and outwardly a leg strut 3 of angle-shape cross section, these struts 3 being braced 3 together near their lower ends by appropriate cross members 4. The stand 1 may be furnished, if desired, at its lower end with wheels, castors or the like.
To the front of the stand 1 is afiixed a supporting frame 5 for a carrier for the bags to be operated on by the machine. Such frame is of elongated rectangular form and is defined by a track consisting of two spaced parallel rails 6, which extend horizontally across the front of the stand and define the path of movement of the bags across the front of the machine, and two side members 7 which extend between the horizontal rails 6 at the ends thereof. Each of the rails 5 is of angleshape in section and is bolted to the stand 1 with one flange of the rail proiecting rearwardly from the front surface of the stand and perpendicular to the latter and the other flange extending upwardly from the forward edge of the first mentioned flange, one rail being located at the upper part of the stand and the other rail being located atthe lower part of the stand. To provide a more rigid support for the frame 5, the two side members 7 are advantageously extended below the lower horizontal rail to form additional leg struts 3 for the machine. Conveniently, the side members 7 are formed of flat strip metal and at their lower ends, below the lower horizontal rail, are cranked slightly rearwardly to form the struts 8, the extreme lower ends of the members being again cranked rearwardly and being provided with feet 9 adapted to engage the floor or base surface on which the'machine is placed.
On the frame 5 is mounted a support 10 for the bags to be sealed by the machine, such support being adapted to he slid along the frame 5 transversely across the front of the machine. The support 1i! comprises a carrier 11, conveniently in the form of a fiat board, having at each side of the rear of its upper part a roller 12 adapted to slide along the upper edge of the upper horizontal rail 6 and at each side of the rear of its-lower part a similar roller 13 adapted to slide along the upper edge of the lower horizontal rail 6, the rollers being carried by spindles projecting rearwardly and perpen dicularly from the rear surface of the carrier. In addition, the carrier 11 is provided at each side of its lower edge with a roller 14 adapted to slide along the forward face of the lower horizontal rail 6, the two rollers" 14 being mounted on spindles projecting perpendicularly downwardly from the lower edge of the carrier.
The carrier 11 is provided with two parallel spaced slots 15 extending between the upper and lower parts of the carrier perpendicularly to the horizontal rails 6 andthrough the slots 15 pass bolts 16 on which are mounted a platform 17 on which the bags to be sealed may be placed.
The platform 17 is at each side supported on, and secured to, one flange of an L-shaped bracket 18, the other flanges of these brackets projecting downwardly from'the rear edge of the undersurface of the platform 1! and registering with the slots 15 in the carrier. The bolts 16 passing through these slots pass through holes in the said downwardly projecting flanges and receive wing nuts 19 which when tightened against the said bracket flanges fix the platform 17 securely in position on the carrier. To adjust the height of the platform 17 from the floor or base surface on which the stand 1 rests, it is only necessary to loosen the wing nuts 19, slide the platform along the carrier, this sliding being guided by the bolts 16 moving along the slots 15 in the carrier, and then retightening the wing nuts 19 to lock' the platform in its new position. The platform advantageously has at one end, preferably the left hand end, a side plate 20 against which the side of the bag may be registered when the latter is placed on the platform.
Preferably, the carrier supporting and guiding frame 5 has" at each end a stop 21 to limit the extent of travel of the carrier 11, such stops conveniently comprising cylindrical elements secured to the frame side members c ances 7 at a position just above the lower horizontal rail of the frame so as to be engageable by a bottom roller 13 of the carrier.
In order to provide for further adjustability of the height at which a bag is supported, one .or more additional platforms 22 may, as shown in FZGURE 4, be provided for superposition on the main platform 17 secured to the carrier, the or each such additional platform comprising a backing board 23 carrying a support 24 which projects perpendicularly outwardly from the board 23 and which is similar to the main platform 17, but smaller than the latter, such board 23 having at its lower part an angled bracket 25' by which it may be releasably secured to the main platform, the arrange ment being such that when the additional platform '22 is secured to the main platform 1'7, the backing board 23 is flatly superposed on the carrier with the lower edge of the board supported on the main platform 17 and the support 24 is spaced above the latter.
The top plate 2 of the stand it carries four pillars 26, arranged at the corners of a square, which pillars in turn carry a support plate 27 for the operative part of the machine.
The upper surface of the support plate 27 has an integral upstanding boss 28 (see particularly FIGURES 5 and 6) horizontally through which rotatably passes a spindle 29 on which is also rotatably mounted, side by side with the boss 28, a further boss 3% formed integrally with an attachment plate 31 secured to the rear of a rectangular box-like housing 32, the attachment plate 31 with its boss being angularly adjustable relatively to the support plate boss 28 about the axis of the spindle 29 and capable of being retained in any appropriately adjusted position by a locking pin 33 threaded through a passage in the boss 30 and parallel to the axis of the spindle 29, such locking pin 33 being selectively engageable in any one of a plurality of similar, but angularly arranged, passages 34 formed in the boss 28. Additional locking of the two bosses together may advantageously be achieved as shown, by forming the spindle 29 as a bolt which has a head 35 engaging the boss 39 and carries a nut 36 capable of being tightened against the boss 28,
such nut 36 being of elongated form so as to extend beyond the edge of the support plate 27 and carrying at its end a handle 37 to facilitate rotation of the nut.
For convenience the machine will be described as if the front face of the box-like housing 32 were disposed in a vertical plane although, of course, the orientation of the housing may be varied by angular adjustment of theattachment plate 27 about the axis of the spindle 29 and in practice the front face of the housing will probably be in a slightly upwardly and rearwardly inclined plane.
The housing 32 has fixed to the bottom thereof a horizontal guiderail 38 of T-shaped cross section which extends laterally beyond both sides of the housing, the dependent web 39 of the guide rail being located centrally between the lower ends of a pair of feed roller driving shafts 40 and 41 arranged one behind the other in a vertical plane in the housing 32, the lower ends of the shafts 40 and 41 projecting through the bottom of the housing and each carrying a fluted feed roller 42. In the vicinity of these feed rollers 42 the upper part of the guide rail 38 is cut away as shown at 43 and at the leadin end the remaining lower part of the guide rail web has an undulating form of upper edge which is adapted to coact with two fixed sealing strip folding members 44 and 45 to fold a strip 46 of self-adhesive transversely crimped paper longitudinally upon itself and over the closed mouth of the bag when the latter is fed along the guide rail below the top flange thereof, but in front of the web 39, throughand by the feed rollers 42.
The adhesive sealing strip 46 is fed to the folding members 44 and 4 5 from a reel 47 carried upon a horizontal spindle 48 supported by an arm 45* angularly adjustably mounted upon a bracket 5t? projecting from 2; u the feed side of the housing 32. at right angles thereto and parallel to the guide rail 38. The adhesive strip 46 passes from the reel 47 downwardly and under a guide roller 51 arranged on a horizontal spindle 52 carried by a bracket 53 located to the rear of the strip folding member 45.
The strip being fed into the machine is appropriately tensioned by means of a pressure arm 54 which frictionally bears upon the periphery of the reel 47 and which is pivoted at one end to that side of the housing 32 which carries the reel bracket 51 the pressure arm 54- being pulled downwardly on to the reel by means of a tension spring 55 anchored to the arm 54 at one end and attached at the other end to the housing 32.
The folding members 44- and 45 are so shaped that the strip passing therethrough is folded longitudinally to a doubled overor inverted U-shaped cross sectional form. a
The doubled over adhesive strip is initially manually threaded between the fluted feed rollers 42 and from then on the adhesive strip is automatically drawn from the reel 47 and folded and simultaneously engaged over the mouth of a bag, when the upper closed end of the latter is fed along the guide rail in the same direction as the feed of the folded over adhesive strip, the mouth of the bag being guided between the dependent limbs of the folded over strip and between the feed rollers so that the bag, like the folded over strip, is fed forwardly, the folded over strip thus being applied over the mouth of the bag.
To aid the guiding of a bag mouth along the guide rail 58, the latter is provided to one side of the feed rollers with a guide strip 56 which is spaced from the front surface of the guide rail so as to provide a slot through which the bag mouth must pass as it is fed to the feed rollers. Preferably, as shown, the end of the strip 56 remote from the feed rollers is bent outwardly away from the guide rail so as to provide a flared mouth to the said slot. I
If it is desired that a tearing thread should be incorporated in the sealing strip along the fold thereof, such a thread may be fed centrally into the folding member'45 simultaneously with the adhesive strip, the said thread being conveniently brought from a bobbin 57 on a vertical bobbin spindle 58 fixed upon the top flange of the guide rail 38, the thread conveniently 'being guided through a thread tensioning device 5? of normal form.
Along the rear of the lower edge of the web 39 of the guide rail 3% there is mounted an inverted semicylindrical guide channel 6% along which the operator may run his forefingers as he feeds the top of the bag (held between the forefingers and thumbs of his left and right hands) along the guide rail.
On the underside of the top flange of the guide rail and to the rear of the web 39 is mounted a trip rod 61 which extends longitudinally of the rail and is capable of limited axial movement with respect to the rail, being urged, in a direction opposite to the direction of feed of the adhesive strip and the bag to be sealed, by means of a compression spring 62 located between a bracket 63 on the rail and a collar 64% fixedly secured on the rod 61, an adjustable trip arm 65 being mounted on this trip rod and having a forwardly projecting, preferably rubber covered, lug 66 against which the left hand of an operator, is. that hand holding the leading upper corner of the bag, will engage when the bag has passed between the feed rollers 42 and has been fully sealed, further movement of the operators hand in the feed direction causing endwise movement of the trip arm 65 and trip rod of and effecting the operation of a cutter or guillotine (hereinafter described) to severe the adhesive strip 46 behind the trailing upper corner of the latter, but in advance of the feed rollers.
The driving shaft 40 to which the front feed roller 42 is secured is journalled at its upper end in a bearing block 57 pivoted to one side of the housing 32 for movement about a horizontal axis 68 so that the shaft 40 is capable of slight swinging movement in a vertical plane containing the axis of the roller shaft 41, this slight forward movement of the: front shaft 40 being achieved by means of a cam or eccentric 69 rigidly carried by a spindle 70 journalled in a bottom bracket 71 within the lower part of the housing 32, the spindle 70 extending horizontally through and beyond one side of the housing and being provided with a small cranked handle 72 by which the spindle 70 can be rotated to operate thev cam 69 thereby slightly to separate the feed rollers 42 in order to permit the threading of the adhesive strip 46 initially therebetween and to release such strip, when required, from being fed forwardly by the feed rollers.
The upper end of the front feed roller driving shaft 40 is furnished with a spur wheel 73 which meshes with-a similar gear wheel 74 upon the upper end of the rear feed roller driving shaft 41 which is appropriately 'journalled at spaced positions in the said housing and in brackets therein, the intergengagement between the gear wheels 73 and 74 being sufficiently free to permit the swinging adjustment of the shaft 40 with respect to the 'shaft 41.
A dog clutch collar 75 is mounted on the upper part of the shaft 41 above the gear wheel 74, this collar 75 being keyed or splined to the shaft so as to rotate therewith whilst being capable of axial movement along the shaft. For effecting this axial adjustment of the dogclutch collar 75, a fork 76 is provided which at one.
-ment being such that the large spur wheel 78 can freely rotate without the clutch collar 75 and shaft 41 until the "clutch collar is raised into engagement with the clutch half 79 by the raising of the fork 76.
The spur wheel 78 meshes with a spur pinion 80 secured coaxially below a second large spur wheel 81 forming a part of an intermediate gear unit journalled on a vertical axis between the top of thehousing 32 and a horizontal upper bracket 82 within the latter. The spur wheel 81 meshes with a spur pinion 83 fixed to the lower end of a primary driving shaft 84 vertically entering the upper end of the housing 52 and rotatably c0- axially coupled to the shaft of an electric motor 85 located above the housing and receiving its power from any suitable electric supply source.
It will thus be seen that, when the electric motor 85 is switched on, the drive from the primary driving shaft 34 is conveyed through the pinion 83, the spur wheel 81 (which may be formed of a fibre or other non-metallic material), the spur pinion 8d and the spur wheel 78 (which may also be formed of fibre or other suitable non-metallic material) carrying one half of the dog clutch. When the clutch collar 75 is moved into engagement with the clutch half 79 on the spur wheel 78, the rear feed roller driving shaft 41 is driven and, through the gearing between thisshaft and the front feed roller shaft 40, the latter is also driven, the two shafts being driven in opposite directions. Thus, where the strip is fed from right to left as viewed by the operator, the rear shaft will be driven clockwise (when viewed from above) and the front shaft will be driven anticlockwise.
The clutch actuating rod 77 is normally depressed by means of a lever arm 86 which is pivoted at one end to one side of the housing 32 and which bears, between its ends, upon the upper end of the clutch actuating rod 77, the othere end of the lever arm 86 being'connected by a strong tension spring 87 to the bottom, or other suitable part, of the housing by an adjustable eye-bolt 88. The clutch actuating rod 77 is furnished with an abutment 89 adapted to co operate with a notch or recess 95} in the upper end of a trip lever 91 pivoted at its lower end upon one arm of a manually operable bell crank lever 92 fixed at its elbow upon one end of a horizontal spindle 93 journalled in an intermediate bracket 94 fixed in the housing, the spindle193 also having fixed thereto a lever arm 95 connected by a tension spring 96 to the rear or other affixed part of the housing so as normally to turn the spindle 93 in such a direction as to'move the trip lever 91 to its lowermost position shown in FIGURE 8 and in full lines in FIGURE 9. The trip lever 91 occupies a generally vertical position and is maintained in this position by means of a tension spring 97 which may conveniently extend rearwardly as shown from the trip lever to an anchorage point farther back in the housing, such anchorage conveniently being formed as shown by the guillotine trip operating spindle 95 subsequently described.
The second arm of the bell crank lever 92 is connected by a bifurcated lug 99 to one end of the inner cable 100 of a Bowdenwire assembly 101, the outer casing of this assembly abutting against; an adjustable stop 102 screwing into the rear of the housing 32 and the other end of the innere cable being anchored to a foot operated lever 103 which is pivoted on a bracket 104 fixed to the front lower part of the stand 1, the foot operated lever 103 being urged upwardly by a compression spring 105 and depression of this foot lever causing the cable to be withdrawn partially from the housing to rotate the bell crank lever 92 and thereby to cause the latter to move the cluutch actuating rod 77, the latter moving the dog clutch collar 75 into engagement with the second half 79 of the dog clutch and these two clutch parts remaining interengaged so long as the foot lever is depressed, but being disengaged as soon as the foot lever is released or, as will hereinafter be explained, on the automatic release of the trip lever 91 from the abutment 89, which it engages on the clutch actuating rod.
The clutch actuating rod 77 extends downwardly beyond the abutment 89 and is connected at its lower end to a pivoted guillotine blade 106 movable transversely of the guide rail 38 and co-operating with a fixed guillotine blade 107, these two blades being arranged adjacent to the discharge side of the feed rollers 42' and so disposed as to be in a position to sever from opposite sides the folded over sealing strip after its application to a bag, the cutting being arranged to take place immediately after the bag has passed, in a forward direction, from the feed rollers. Thus, when the trip lever 91 is raised by means of the bell crank lever 92 as a result of depression of the foot operated lever 103, the clutch actuating rod 77 is raised and consequently the pivoted guillotine blade 106 is swung into a cooked position so that the doubled over sealing strip and the top of a bag can pass between the two guillotine blades.
in order that the guillotine shall operate to sever the said sealing strip as above described immediately the top of the bag has passed through and beyond the feed rollers, the trip rod 61, mounted along the guide rail 38 and carrying the adjustable trip arm 65, is connected to one end of a lever 108 fixed to the lower end of the guillotine trip operating spindle 98, this spindle being rigidly furnished with a cam 109 co-operating with a slide 110 carried on a bracket 111 and slidable horizontally in an endwise direction under the action of the cam 109, the slide being urged into constant interengagement with the cam by appropriate spring means as shown.
If the foot operated lever 103 has been depressed and the trip lever 91 and the clutch actuating rod 77 have been raised to, and remain in, their highest positions, then actuation of the guillotine trip operating spindle 98 causes the cam 109 thereon to advance the slide 110 forwardly and to engage the upper end of the trip lever 91 and disengages the latter from the clutch actuating rod 77 which will immediately, under the action of the spring loaded arm 86 hearing thereon, rapidly descend and cause the pivoted guillotine blade 106 to snap to the closed position, thereby severing the adhesive strip. Simultaneously, the descent of the clutch actuating rod 77 will disengage the dog clutch collar from the other half 79 of the dog clutch and thus bring the feed rollers of the machine immediately to rest.
The feedroilers 42 and guillotine may, if desired, be enclosed in a movable, e.g. hinged, casing which protects the fingers of an operator from the feed rollers and the guillotine whilst permitting the free passage of the mouth of the bag and the sealing strip between the said rollers and blades of the guillotine to maintain the feed rollers normally in the closed positioma spring 112 bears on the front feed roller shaft 40.
It will be appreciated that the carrier 11 enables the bags to be easily moved across the machine and the adjustable platform 17 mounted on the carrier enables difierent sized bags to be supported on the carrier with the mouths of such bags in correct-position to be passed along the guide rail and between the feed rollers.
FEGURE ll shows in cross section the upper end of a bag 1-13 sealed using the above described machine.
The forms of the invention here described and illustrated are presented merely as examples of how the invention may be embodied and applied. Other forms, embodiments and applications of the invention, coming within the proper scope of the appended claims, will, of course, suggest themselves to those skilled in the art.
1. A sealing machine for a bag comprising a stand, a frame mounted on said stand having a longitudinally extending track thereon, a carrier slidably mounted for horizontal movement on said track, a platform for supporting a bag disposed on said carrier, operating mechanism for said machine, a support for said mechanism disposed above said track on said stand, a guide rail mounted on said support above and parallel to said track for engagement with the mouth of a bag during the sealing thereof, a pair of feed rollers carried by said support at the level of said guide rail to engage the mouth of a bag therebetween, means for rotating said rollers in opposite rotational direction, a holder for a reel of sealing strip bearing adhesive on one side thereof, folding means shaped and positioned to longitudinally fold said sealing strip upon itself when drawn therethrough by said rollers for sealing application to the mouth of such bag, and manually operated trip means mounted on said guide rail at a distance from said rollers to interrupt the drive thereof upon completion of such sealing operation.
2. A sealing machine according to claim 1, wherein said carrier comprises a vertically disposed flat member, two sets of rollers pivotally mounted at the top and bottom of said member for horizontal movement along said track, parallel slots disposed in said member for adjustably mounting said platform relative to said guide rail to convert said machine for use on bags of different heights.
3. A sealing machine according to claim 1 wherein said trip means comprises a longitudinally extending rod capable of limited axial movement relative to said guiderail, resilient means for urging said rod in a direction counter to that of bags fed by said feed rollers, and a releasable arm carried by said rod for manually operatingsaid trip means, the position of said arm on said rod being adjustable to regulate the distance thereof from said feed rollers andconvert said machine for use on bags of difierent widths.
4. A sealing machine according to claim 1 having guillotine means for severing the sealing strip disposed adjacent said feed rollers and operating means for said guillotine means, said operating means being actuated by said trip means.
5. A sealing machine according to claim 1 wherein a first of said feed rollers is connected to said operating mechanism and the second feed roller is disposed upon a pivotally mounted shaft, cam means for engagement with said shaft, and handle means for operating said cam 5 to swing said second feed roller from said first feed roller and permit threading of the adhesive strip and the mouth of a bag therethrough.
6. A sealing machine according to claim 5 wherein spring means causes said second feed roller to normally 10 bear resiliently against said first feed roller.
References Cited in the file of this patent UNITED STATES PATENTS Brand June 28, 1921 Malocsay Jan. 10, 1922 Brady June 4, 1935 Belli Apr. 3, 1956 Hopkins Aug. 5, 1958 FOREIGN PATENTS Great Britain Apr. 30, 1942