US 3285649 A
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Description (OCR text may contain errors)
Nov. 15, 1966 D. HARTON 3,235,549
GRASPING DEVICE FOR JUTE BAGS AND THE LIKE PIECES OF FABRIC Filed July 51, 1964 2 Sheets-Sheet 1 /NVENT0/? /3 Daniel HA/PTO/V QM W PA TENT AGEN T D. HARTON GRASPING DEVICE FOR JUTE BAGS AND THE LIKE PIECES OF FABRIC 2 Sheets-$heet 2 Filed July 31, 1964 lNVENTfl/F Dan/kl llA/PTOA/ QM P PATENT A6f/V7' United States Patent 3,285,649 GRASPING DEVICE FOR JUTE BAGS AND THE LIKE PIECES OF FABRIC 1 Daniel Harton, Black Lake, Quebec, Canada, assignor 0f fifty percent to Paul M. Pidcock, Westmount, Quebec,
Canada Filed July 31, 1964, Ser. No. 386,496 8 Claims. (Cl. 294-61) The present invention relates to a device specially woven fabric from a stack of pieces, in such a way that a substantial surface area of the piece of fabric will adhere to the grasping device, such that the latter can transfer the piece of fabric from the stack to any other suitable location.
A more specific object of the present invention resides in the provision of a fabric grasping device, which is more particularly adapted for use as a component of a bag placing machine for the purpose of placing jute bags onto the outlet spout of a horizontal type pressure packer machine, in a completely automatic manner without manual assistance other than the original stacking of the empty jute bags in a magazine.
Another object of the present invention resides in the provision of a grasping device of the character described, which is adapted to grasp only the top wall of the topmost bag or a stack of such bags made of fabric and to lift said topmost bag off the stack in order to allow opening up of the bag for eventual filling of the same.
Another object of the present invention resides in the provision of a grasping device of the character described, which holds the piece of fabric in a very efficient and firm manner and over a substantial surface area of the same.
Yet another object of the present invention resides in the provision of a grasping device of the character described, which can be easily adapted to grasp fabrics of different types of weave and/ or yarn.
The foregoing and other important objects of the present invention will become more apparent during the following disclosure and by referring to the drawings, in which:
FIGURE 1 is a perspective view of a bag placing machine using, as one of its components, the grasping device in accordance with the present invention;
FIGURE 2 is a top plan View of the grasping device;
FIGURE 3 is a side elevation;
FIGURE 4 is a cross section, the main plate being partially broken away; and
FIGURE 5 is a partial longitudinal section, on an enlarged scale, taken along line 55 of FIGURE 4.
Referring now more particularly to the drawings in which like reference characters indicate like elements throughout, the grasping device in accordance with the invention comprises a main plate 1, of elongated rectangular shape, having a substantially flat fabric-contacting face 2 provided with a plurality of longitudinally extending grooves 3, of generally T-shaped cross section, and opening at one end 4 of plate 1. j
A plurality of bars 5, of T-shaped cross section, are slidably mounted within grooves 3, having a sliding fit therein. Bars 5 are interconnected at the end 4 of plate 1 by means of a header plate 6 protruding from the other face 7 of plate 1.
The assembly of bars 5 and header plate 6 can be longitudinally moved with respect to plate 1 by any suitable power means such as an air cylinder and piston unit 8,
which, for instance, is attached to header plate 6 and to a bracket 9 secured to plate 1.
Main plate 1 is provided between grooves 3 with lon-' gitudinal rows of inclined bores 10, in which are fitted with a tight fit conventional nails 11, such that the point 12 of said nails will protude from the fabric contacting face 2 of plate 1.
Similarly, bars 5 are each provided with a series of longitudinally spaced inclined bores 13, in which are fitted shorter nails 14, the point 15 of which protrudes from the fabric-contacting face 16 of said bars 5.
Faces 2 and 16 of plate 1 and bars 5, respectively, are substantially flush and bars 5 are movable in a plane parallel to said faces 2 and 16. The points 12 provided by nails 11 are substantially equally spaced and disposed in longitudinal and transverse rows, and .the points 15 of nails 14 of bars 5 are also equally spaced and disposed in longitudinal and transverse rows. Moreover, the longitudinal rows of the nails 11 alternate with the longitudinal rows of nails 14.
Nails 11 are oppositely inclined with respect to nails The stroke of bars 5 is equal to at least the distance separating two successive nails 14 and such that said nails 14 will, during movement of bars 5, intersect the transverse rows of tips 12 of nails 11.
In the use of the device 20 for the grasping and transfer of'jute bags, the device is brought to bear onto the topmost jute bag of a stack of such bags such that faces 2 and 16 of plate 1 and bars 5, will contact firmly the top wall of said bag and the majority of points 12 and 15 will engage the interstices between the woven yarns. of the bag.
The cylinder unit 8 is thereafter actuated to move header 6 and bars 5 so that the transverse yarns of the top wall of the bag will be displaced by the nails to take a more or less zigzag shape. Substantially the same yarns, or at least clusters of adjacent yarns being engaged from both sides by the points 12 and 15. Thus, the top bag wall is firmly grasped over a substantial area by the device in accordance with the invention and the latter can be lifted with the bag so as to transfer the bag and, at the same time, open the same, the lower wall of the bag becoming separated by gravity.
The grasping device 20 of the present invention may be used, for instance, as a component of a bag-placing machine, shown in perspective view in FIGURE 1.
The device 20 is mounted in the machine of FIGURE 1 so as to be bodily swung to one side, as shown in FIG- URE 1, from positions in which plate 1 is horizontal with its face 2 being its underface. In the horizontal position of device 20, the latter can be raised or lowered; in the lowermost position, plate 1 contacts the topmost bag of a stack of jute bags, not shown, housed in magazine space 21 underneath the device 20. Thus, the device 20 can be operated to grasp the top wall of the topmost bag of the stack, raise the bag off the stack so that the bottom wall of the bag will hang freely to open up the mouth of the bag, ready for the insertion into said mouth of a corner form-er attachment 22.
Device 20 is then swung to one side to bring the sides of the jute bag in a vertical position. The edges of the bag mouth are then grasped by fingers 23 and, after re lease of the bag from device 20, said bag can be transferred and fitted to the spout of packer machine (not shown) for filling the bag. Then, the full bag is transferred to a tilting table 24, which drops the bag in vertical position onto a discharge conveyor 25.
The machine of FIGURE 1 forms no part of the invention and is illustrated only to show a specific application of the grasping device 20.
As will be noted, the grasping device can open up the jute bag for subsequent easy filling of the same, and this in a completely automatic manner.
Points 12 and 15 may be provided with saw teeth or the like and their spacing and height may be varied to suit different types of yarns and weaves of the fabric pieces to be grasped.
While a preferred embodiment in accordance with the invention has been illustrated and described, it is understood that various modifications may be resorted to without departing from the spirit and scope of the appended claims.
What I claim is:
1. A fabric grasping device comprising a first element having spaced substantially fiat and substantially flush fabric-contacting surface portions, a second element having space-d substantially flat fabric-contacting surface portions extending between the surface portions of said first element and substantially flush therewith, a plurality of spaced points carried by each of said elements protruding from said surface portions and distributed over substantially the entire area of said surface portions, said elements being reciprocable relative to one another in planes parallel tosaid surface portions so that the points of one element will intersect lines passing through the points of the other element, and means to reciprocate one element relative to the other, said points being inclined with respect to said surface portions, the points carried by said first element being oppositely inclined with respect to the points carried by said second element.
2. A fabric grasping device as claimed in claim 1, wherein said points are disposed in longitudinal rows, the rows of one element alternating with the rows of the other element.
3. A fabric grasping device as claimed in claim 2, wherein the points of each element are further aligned in several transverse rows.
4. A fabric grasping device comprising an elongated plate having a substantially flat fabric-contacting surface and provided with longitudinally extending transversely spaced grooves made therein, bars slidable in said grooves, a head element interconnecting the ends of said bars protruding from one end of said plate, power means to move said bars in said grooves relative to said plate, said plate and bars having substantially flush fabric-contacting surfaces, a plurality of spaced points protruding from said surfaces, the points of said bars intersecting lines passing through the points of said plate during movement of said bars said points being inclined with respect to said fabriccontacting surfaces, the points of said bars being oppositely inclined with respect to the points ofsaid plate.
5. A fabric grasping device as claimed in claim 4, wherein said grooves and bars are provided with means to slidably retain said bars in said grooves.
6. A fabric grasping device as claimed in claim 4, wherein said points are those of nails fitted in bores in said plates and in said bars.
7. A fabric grasping device as claimed in claim 4, wherein said points are disposed in longitudinal rows, the rows on said bars alternating with the rows on said plate.
8. A fabric grasping device as claimed in claim 4, wherein said points are disposed in longitudinal rows, the rows on said bars atlernating with the rows on said plate, the points on said bars being further transversely aligned in several courses, the points on said plates being further transversely aligned in several courses.
References Cited by the Examiner UNITED STATES PATENTS 7/1952 Rose 2946l 4/1959 Abbott 294103 X