US2730991A - Oscillatable paste dispensing unit - Google Patents

Description

Jan. 17, 1956 G. o. BAUGHAN 2,730,991

OASCILLATABLE PASTE DISPENSING UNIT BY @wa/Wim ATTORNEYS- Jan. 17, 1956 G. o. BAUGHAN 2,730,991

OSCILLATABLE PASTE DISPENSING UNIT 2 Sheets-Sheet 2 Filed Aug. '7. 1952 Hummm IN VENTOR BY @wg ATTORNEYS United States Patent OSCILLATABLE PASTE DISPENSDIG UNIT Graham O. Baughan, Richmond, Va.

Application August 7, 1952, Serial No. 303,118

2 Claims. (Cl. 118-415) This invention relates to a pasting device particularly designed for applying paste in the form of a series of separate spots to the flange margin of the sleeve insert blank preparatory to its insertion into the valve of a valved bag.

The general object of the invention is to increase the eiciency of production of valved bags when the conventional method is' practiced of inserting the sleeve by hand. The valve is a pre-creased infolded dihedral portion of the bag at one corner near the top, the top being left open at the time the sleeve is inserted, providing lateral wings extending upwardly from an inwardly extending fold line. The conventional practice is for a single operator, usually a girl, to perform the entire sleeve inserting operation, which requires the use of one hand in holding the mouth of the bag spread to bring the inner edges of the wings substantially into a common straight line. This leaves to the other hand the task of transferring the sleeve from the pasting device to the bag. The pasting device is therefore in most instances operated by a foot treadle, leaving the hands for the above described manipulations.

A foot operated pasting machine must necessarily be a lloor model, and therefore, less portable on account of its weight and bulk than a table model, which may be carried readily from one location in a factory to another, wherever there is a quantity of bags to be completed, this being frequently more convenient than to have to bring the bags to a permanently located pasting machine. Furthermore, in the use of a foot operated machine the girl must maintain a relatively restricted Stance With respect to the pasting machine, which introduces an element of inconvenience and ultimate fatigue resulting from the continual turning or bending of the upper part of the body in transferring the sleeve blank from the pasting machine to the bag which she is holding spread. This materially cuts down production.

The present invention has for one of its objects the provision of a pasting device which is not foot operated, and therefore, leaves the operator free to assume a compromise position between the pasting device and bag, which is most comfortable to her, which gives her freedom of moving about on her feet, and prevents the fatigue which follows maintaining an enforced attitude for long time periods'. In the present invention the foot treadle is substituted by a construction of the device that enables the hand which is free of the bag to operate the pasting device and transfer the sleeve blank with the applied paste in such quick succession as to minimize lost motion and to appreciably enhance production over what has heretofore been accomplished by the foot operated type of pasting machine.

Other objects of the invention relate to specific structural features whichwill appear as the following description of a preferred and practical embodiment of the invention proceeds.

In the drawings which accompany and form a part of the following specication, and throughout the several 2,730,991 Patented Jan. 17, 1956 ICC figures of which the same characters of reference have been used to denote identical parts:

Figure l is a perspective view of a pasting device embodying the features of the invention;

Figure 2 is an end elevation viewed from the lefthand end in Figure l;

Figure 3 is a cross-section taken along the line 3-3 of Figure l;

Figure 4 is a side elevation partly in section, of the side of the pasting device;

Figure 5 is a horizontal section taken along the line 5 5 of Figure 4;

Figure 6 is a vertical section taken along the line 6-6 of Figure 4.

Referring now in detail to the figures of the drawing, the numeral 1 represents a flat base which is suitably rested upon a table or other support in a horizontal plane when the device is operated. A plate 2 is secured to the support, having fixed thereto a longitudinally siotted block 3. The slot 4 in said block extends longitudinally of the base and defines spaced side lugs 5 and 6, which have aligned holes for the horizontal pivot bolt 7.

An arm S hasrits lower end fitted into said slot and journaled in said pivot bolt. Said arm at its upper end carries the paste hopper 9, which in the form shown is shaped as a funnel. A discharge pipe 1t) extends forwardly in the vertical plane of swing of the arrn 8, being rigidly welded to said arm at its upper end, and being in communication with the lower end of said hepper. Said discharge pipe has a laterally extending portion 11 which is shown being depressed by the hand in Figure 2, and a downwardly turned portion 12 which is substantially parallel to the arm 8. At the end of the downwardly extending portion 12 and communicating therewith is a manifold 13, which is perpendicular to the vertical plane in which the arm swings. A series of spaced nozzles 14 of uniform length extend from the under surface of the manifold 13. Check valves 15, which are in the form of balls in the embodiment shown in Figure 3, are within the mouths of the nozzles and project slightly therefrom, as shown in Figure 3. The mouths' of said nozzles are in a plane that intersects the arrn 8 perpendicularly at some distance above the base 1, so that when the arm 8 is in the vertical position shown in Figure 4, the mouths of the nozzles will be spaced from the base 1. An upright post 16 is conveniently inserted within the slot 4 to the rear of the arm S and fixed in any suitable manner such as by welding. At its top it carries an adjustable stop 17 engageable by the arm 8 when the latter swings backward beyond vertical position. A spring 1S, which is anchored at 19 to the base and at 20 to the upper end of the arm 8, biases' the arm 8 normally against the stop 17. When the arm is in this position which is at a small angle to the vertical, the manifold 13 and nozzles 14 are in a Y somewhat elevated position with respect to that shown in Figure 4.

The hopper 9 is provided with a preferably permanently closed cover 21 in the form of an annulus, the hole 22 in the middle of the cover giving access to the interior of the hopper for replenishing the paste therein, and for cleansing purposes. The discharge pipe 10 is of relatively large size to facilitate cleaning, and there is a' plug 23 in one end of the manifold 13, which may be removed in order to flush out the manifold. The opposite end of the manifold is closed. The nozzles 14 are readily removable with a small wrench. Springs 24 are within the nozzles between the ball valves 15 and retainingrpins 25. Said springs may exert tension against the ball valves to keep them closed, but it is preferred to have the balls free from tension, the springs functioning merely as cushions against which the balls yield when they come inl contact with the sheet to which paste is to be applied. This freedom of the balls from tension causes them to close gravitationally and rela tively slow, since they must displace a film of paste from the surfaces against which they seat, this retarded closing permitting a small amount of paste to cling as a flat drop to the face of the nozzle to ensure that an adequate quantity of paste will be applied to the sheet, regardless of the rapidity with which the pasting device may be operated. Y

The space between the nozzles 14 and the base l provides a station at which a stack of sheets may be presented in the path of movement of the nozzles. At this station a receptacle is located. rIhis comprises a rack of generally rectangular shaperhaving a base 27, a relatively high back wall 28 parallel to the series of nozzles, and a relatively high end wall 29 at one end. These relatively high walls afford means contacted by two perpendicular sides of the valve sleeve blanks 3l), so that the latter may be congruently stacked. The end wall 29 has a cutaway portion 31 to malte room for the adjacent end of the manifold 13, whichV extends beyond said end wall. For convenience in placing the stack in position and for removing sheets one by one therefrom, there is no opposite endwvall. The front wall of the rack consists of a member 32 of triangular crosssection, as shown in Figure 4. The stack of sheets is somewhat yieldable, so that when placed in the rack the forward portion of the stack lies substantiallyrflat in the path of movement of the nozzles, while'the opposite side of the stack is curved in an upward direction. This has the advantage that the rear edges of the sheets fan out somewhat, as shown at 33, so that with the finger pressed against the topmost sheet each topmost sheet may be lifted singly without bringing up any of the underlying sheets.

The fact that the downwardly extending portion of the discharge pipe, including the nozzles, is parallel to the arm 8, causes the mouths of the nozzles to contact the topmost sheet of the stack actually perpendicular thereto when the stack has been partially depleted. This means that when the stack is relatively tall, the mouths of the nozzles will be at a very slight angle to the plane of the topmost sheet, and when the stack is a1- most depleted, they will also be at a very slight angle to the topmost sheet, but in an opposite direction, so that it is convenient to state that the parallel relationship of the axes of the nozzles to the arm 8 causes the mouths of the nozzles to contact the sheets of the stack substantially normal to the surfaces of the sheets.

The valve sleeve blanks are preformed with aline of weakness 34Y pressed in them adjacent the edge, leaving a margin 35 to which the paste spots are t0 be applied. The discharge pipe 1l) forms a convenient handle which may be pressed by the operator in order to bring the nozzles into contact with the topmost sheet of the. stack. The operation is as follows. The girl holds the bag (not shown in the drawings), open with one hand, with the two wings which form the sides of the valve uplifted until theirV inner edges are substantially in a straight line. While the bag is thus held she presses lightly upon the discharge pipe il, applying paste to the margin of the topmost valve sleeve blank, then immediately shifts her hand to the stack and removes the topmost sheet, which sheV transfers to the bag, placing the margin having the paste spots beneath the substantially rectilinear edges of the' wings and in contact with the under sides of said wings. She now has both hands available to secure the sleeve in the bag, which she does by folding the sleeve outwardly between the wings, forming it into a dihedral angle, at the same time holding the margin firmly in contact with the undersides of the' wings until the sides of the valve, including the folded sleeve, are in flat relationsl-iip. The bag is thenl laid Aon other bagsV in which the sl'eeve'shave been inserted, and the weight of superposed bags holds i the sleeves in place until the paste is diied. YThe bags are laterrcompleted by stitching Athe tops together, including the tops of the wings and the top edges of the folded sleeve, Y

As has been stated, the fact that the girl does not have to maintain a position convenient to the operation of the foot treadle, enables her to assume a comfortableV attitude halfway between the'pasting machine and the bag, so that the transfer of the sleeve from the pasting device to the bag is accomplished without any strained movements, with resultant fatigue. The `time saved in this part of the operation offsets the slight interval required between pressing the dischargev pipe 16 Vand removing the freshly pasted valve sleeve blank.

Another advantage of the invention is that each time the device is oscillated a tide of paste is produced within the hopper, which has the effect of keeping the paste in motion, preventing the formation of a film on Ythe surface, due to evaporation. The permanent cover `prevents the paste from spilling from the hopper. In lling the hopl per it is not necessary to remove the cover. Therefore,

more cleanly operation is possible than if it were neces-V sary to remove the cover and lay it down somewhere while the hopper is being filled. At the endrof, the day if there is paste in the hopper, evaporation may be prevented by laying one of the valve-sleeve blankls across the cover to close the opening 22. Y Y

' The stop 17 may be adjusted to secure any amplitude of oscillation of the device which the particular op-v crater may have found best suited to her speed. Lilie# wise, the tension ofthe spring may be adjusted .by selectively engaging any length of chain 36 withinrthe hook i9, which forms the anchorage of the spring to Y Vthe base 1. Y

'While this device has been designed for a particular purpose, it is obvious that it is useful wherever it is desired quickly toV apply a series of paste spotsl to a sheet for anyl purpose whatsoever, and the scope of the invention is to be regarded in this light.

While l have in the above description disclosed what I believe to be a preferred and practical embodiment of the invention, it will be understood by those skilled in the art that the specific details of construction and arrangement of parts, as shown, are by way of example and not to be construed as limiting the scope of the invention.

What l claim is: l. Pasting device comprising a normally horizontal base and an oscillatory pasting unit mounted thereupon come prising a supporting arm pivotally mounted at lits lower end on said base to swing in a vertical plane, a stop on saidbase in said plane engageable with said arm to limit its swing in one direction to a small angle beyond the vertical, a spring anchored between said Ysupporting arm and base urging said arm toward said stop, a paste container Vrnounted on said arm adjacent the end remote from its pivotal connection, and rigid with said arm, including a hopper, an elbow shaped conduit having its axis inrsaid vertical plane and h ving one end connected to said hopper and the other end downturned, a manifold perpendicular to said vertical piane connected intermediately to the lower end of said conduit, a series of nozzles along the lower'. side of `said manifold having their mouths in a horizontalV plane when said arm is vertical, and spring closed valves controlling said nozzles, protruding therefrom to be opened through Contact with an underlying sheet, said elbow shaped conduit constituting a handle depressible vfor."Y

arm and base urging said arm toward said stop, a paste container mounted on said arm adjacent the end remote from its pivotal connection, and rigid with said arm, including a hopper, an elbow shaped conduit having its axis in said vertical plane and having one end connected to said hopper and the other end downturned, a manifold perpendicular to said vertical plane connected intermediately to the lower end of said conduit, a series of nozzles along the lower side of said manifold having their mouths in a horizontal plane when said arm is vertical, spring closed valves controlling said nozzles, protruding therefrom to be opened through contact with an underlying sheet, said elbow shaped conduit constituting a handle depressible for oscillating said pasting device, a tray on said base beneath said nozzles defining a pasting station for stacked sheets, said tray having wall structure for determining the congruent stacking of said sheets, and

6. a floor structure, horizontal beneath said nozzles, and upwardly inclined at the end remote from said nozzles to support the stacked sheets with their superposed end edges fanned out.

References Cited in the file of this patent UNITED STATES PATENTS Re. 22,128 St. Hilaire July 7, 1942 39,609 Young Aug. 18, 1863 1,222,940 Edwards Apr. 17, 1917 1,494,315 Ostenberg May 13, 1924 1,575,564 Fleming Mar. 2, 1926 1,647,072 Bergstein Oct. 25, 1927 1,764,423 Stone June 17, 1930 2,190,766 Bennett Feb. 20, 1940

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