US2668481A - Machine for manufacturing valve bags - Google Patents

Description

1954 P. c. ROBINSON 2,668,481

MACHINE FOR MANUFACTURING VALVE BAGS Filed Oct. 29, 1948 4 Sheets-Sheet l INVENTOR @111. 6'- POEM saw ATTORNEYS Feb. 9, 1954 P. c. ROBINSON MACHINE FOR MANUFACTURING VALVE BAGS Filed Oct. 29, 1948 4 Sheets-Sheet 2 vx xxx MK I N V E N TO R P404 6! Foe/WM Feb. 9, 1954 P. c. ROBINSON 2,668,481

MACHINE FOR MANUFACTURING VALVE BAGS Filed Oct. 29, 1948 '4 Sheets-Sheet s TIHJU.

y /K/ Q; [I ll INVENTOR P904 6'. Pas/Also BY [fiu mm A TTORNEYS Feb. 9,1954 P. c. ROBINSON MACHINE FOR MANUFACTURING VAL .VE BAGS 4 Sheets-Sheet 4 Filed Oct. 29, 1948 INVENTOR P404 dfiaa/A/sa/v Patented Feb. 9, 1954 Z 668A8l UNITED STATES PATENT OFFICE Paul 0..Robinsom-canajoharie, N. Y., assignor .to

Arkell and Smiths, Canajoharie, N.. Y a corporation of New York Ap-plicatiomctober 29, 1948;: Serial-No; 57,1 88" 4. Claims. l

Thepresent invention relates to-the manufacture of paper bags, and has special reference to machines for manufacturing multi-ply valve bagsof the type in;which a filling sleeveextends through the valve-opening.

One of the objects of the inventionais to provide a novel and improved machine of thischaracter- Another object of the invention. is-to' provide a machine whichis simple in construction and eflicient in operation for forming the valve in the endof a bag; tube and applying a: supplemental. sheetor patch. to the. valve to form a filling sleeve.

The several features of theinvention, whereby these and other objects may be. attained; will be readilyunderstood from...the following. description. and accompanying drawings,- in which:

Figure 1. is. a view in perspective of a. gusseted bag, tube having a valve extension that is partic.- ularly; adapted to be operated upon by my improved machine and in accordance. with my im. proved method to form a sleeve valve in one end thereof;

Figs. 2'through '7 are views. in perspective of the upper endportion of the bag tube respectively illustrating. di'fierent steps in carrying outmy improved .method;

Fig. Siis a plan view, partly. diagrammatical, andwith parts broken away, of'a machineiembodying features otmy invention in their prefe'rredformthe machine beingshown successivelyoperating. on aplurality of bagtubes;

Fig. 9 is a side view partly in section of the same; Y

Fig.1 10 is a plan view, on-an enlarged scale',. of the rear end portion of the machine illustrated in Fig. 8';

Fig. 11 is a detail view, on an enlarged scale, of a portion .of the machine illustrated. in' Fig. 10;

Fig. 12 is a sectional side View, taken substantially on the line l2"-l2'of'Fig. 11;

Fig-13is a view'in perspective: of a portion of a'bag tube and certain forming devices therefor illustrating one step in the manufacture of the completed bag;

Fig; 14'is a side view ofthe p'ortionofthe machine illustrated in Fig. 10;

Fig; 15 is a detail plan view; on an enlarged scaleof' a portion'of the machine illustrated in Fig. 10; Fig. 16 is a side view partly insection of the same; and

' Fig. 17 is a view-corresponding to a portion of Fig. 15 but withparts-in a different position.

The machine as illustrated in'the drawings,

2. is particularly, adaptedfor use informing. a sleeve valve in a multi-ply bagtube 2. (Fig. 1) having gusseted sides 4 and a valve extension 5.

Ila accordance with my improved method as preferablycarried out, the end of the bag. tube having the-extension 6 is spread and flattened so as to provide side flaps 8 and end flaps Hi and I2 overlying. theside flaps, the inner side flap. 8 being .foldednback. against the side wall of the bag tube. Such spreading of. the. end ofthe valve tube-may beaccomplished either by hand or by machine. Any suitable. machine or mechanism may be employed .for thus spreading and flattening the. ends. of. the bag. tuba. such for example as the spreading. and flattening mechanism illustratedand described. in the patent'to Potdevin 1,176,163, dated .March 21, 1916.. To assist inv the easy spreading. and flattening of theendof thebag. tube,v the tube may be provided with suitably arranged score lines It and 16.. where. the folds are made. Also the inner end of; the. valve extension maybe scoredon the line. l8-tov permit. it to be easily folded back for the purpose hereinafter described.

After thus. spreadingand flattening the end ofthe bag. tube, the valve. extension .6 is folded back. upon. the underlying end flap 12.. A sleeve patch 2001 the usual form is then appliedto the folded. valve extension 6 by adhesively securing the inner end thereofto the upwardly. directed side. of the extension (Fig. 4), the patch being scored on the line 20.. The valve extension 6 is-then returned to its unfolded position (Fig. 5) and thepatch 20 is foldedback over the edge of the extension and over the end flap l2 with its outer or free end projecting beyond said end flap.

After'thus applying the sleeve patch the inner'side flap 8 is then swung toward the other side flap to recl'ose the end of the bag tube (Fig. '7). During such movement of thisside flap, theva'lve extension 6' and end. flap [2 are centrallyfolded-i' between the=-side flaps, and the sleeve patch 20 is folded on the line 22 between the sides of said end flap, thus positioning the longitudinal edges of the patch substantially flush with the end edges of the bag tube when closed. Also, during such closing movement of the inner side flap, 8,. the other end flap I0 is restored. to its initial position forming continuations of the adjacent'gusset and side walls of the bag tube.

In the machine illustrated in the drawing, the bag tubes" are supplied to-the machine-with their upper ends insprea'd and flattened condition as-illustrated' in 2 The bagtubes: are'conveyed through the machine by any suitable devices as by means of a chain conveyor 24 having suitable gripping devices 28 which engage the upper or advancing end of one wall of each bag tube at spaced points (Figs. 8, 9 and 10).

As the tubes are thus conveyed, a suitable folder 28 is engaged by the valve extension 8 so as to cause the extension to be folded back upon the end flap I2. During the continued travel of each bag tube, the inner end of a sleeve patch 20 is applied to the upwardly directed side of the folded valve extension by means of rollers 38 between which the bag tube passes, the end of the patch previously having adhesive applied thereto so as to cause said end to adhere to the valve extension. The sleeve patches 20 may be successively cut from a strip 32 which is supplied from a roll 34. This strip passes down over idlers 36 and 38 between score rolls 48 which score the strip to form the score line 28' on the completed sleeve patch, and then passes between draw rolls 42, between cutting-off knives 44 and between draw rolls 46 which deliver each patch to a suitable gripping device 48 carried by the upper drum or roll 88. As each sleeve patch is cut off by the knives 4 5, rotating segments 58 engage the patch and feed it between the rolls 46. After each patch is gripped by the grippers '38, it is carried by the upper roll 30 to present the inner margin thereof to the valve extension, an adhesive pad 52 previously applying adhesive to the inner margin of the patch. The pad 52 is carried by a roll 54 and receives the adhesive from a roll 56 that extends into a paste or glue pct 58.

After the inner margin of the patch is thus adhesively applied to the folded valve extension 5, the bag tube passes beneath a pressure belt St so as to insure proper setting of the adhesive.

From the pressure belt 50, the bag tube carries the sleeve patch and the valve extension into engagement with a suitable folder 62 which returns the valve extension to its unfolded position, the sleeve patch being carried therewith as shown in Fig. 5.

The sleeve patch then rides over a suitable folder 64 which folds the patch back over the edge of the valve extension and over the end flap 12 (Fi 6).

During the continued movement of each bag tube with the valve patch thus attached, a rod 58 engages beneath the inner side flap 8 of the bag tube and swings this side flap upwardly and downwardly toward the other side flap. As the inner side flap is acted upon by the rod 86, a blade 58 is swung against the base of the rising side flap, sleeve patch, and end flap I2 so as to insure proper central folding of these parts, and during the continued forward movement of the bag tube the blade 88 is retracted therefrom and out of the path of the bag tube and the rod 68.

Also, during such closing movement of the inner side flap 8, a blade T strikes against the outer edge of the end flap I8 below the gusset line thereof, and thus forces the gusseted portion of the flap inwardly so that during the continued closing movement of the inner side flap 8, this end flap is restored to its initial position as a continuation of the gusset and side walls of the adjacent longitudinal portion of the bag tube (Fig. 13).

After such reclosing of the bag tube with the valve formed therein and the valve patch applied, the bag tube may be discharged from the machine ready for final closing in the usual manner by a line of stitches through the upper margins of the bag tube and the sleeve patch.

As shown, the side flap closing rod 65 may be secured on the underside of a supporting rod I2 having its ends secured to a pair of chains I4 which pass over sprocket wheels I6 that are mounted on shafts I8 having their ends journaled in hearings in the side frames 88 of the machine. The rear shaft I8 is driven so as to drive the chains I4 by means of gears 82 which connect it with a shaft 84 that is driven by a gear 86 thereon that is operatively engaged by a gear 88 which in turn is driven through miter gears 90 from the main drive shaft 92 of the machine (Figs. 10 and 14).

The blade 68 above described is secured on a pivot shaft 94 which has an arm 96 that is connected by a link 98 with a cam lever I88 carrying a cam roll I82 which is .held in engagement with a cam I04 by means of a spring I06. The cam I84 is carried by the shaft 84 (Figs. 15 and 16) The striker blade I0 (Figs. 11 and 12) is carried by a pivot shaft I88 which has an arm III) which is operatively connected through a link I I2 with a cam lever H4 that carries a cam roll H5 held in engagement with a cam I I8 by means of a spring I20. The cam I I8 is carried by the shaft 84. The conveyor chains 24 may be driven by sprocket wheels I22 carried by a shaft I24 that is driven through a gear I26 thereon from driving gear 88.

As will be evident to those skilled in the art, my invention permits various modifications without departing from the spirit thereof or the scope of the appended claims.

What I claim is:

1. In a machine for forming a sleeve valve bag of the class described, which comprises means for feeding gusseted bag tubes longitudinally one behind the other, each bag tube having a valve extension on the advancing end thereof and said end of the bag tube being spread and flattened to provide side flaps and end flaps overlying the side flaps, one of the side flaps being folded against the side of the body of the tube, a folder for causing the valve extension of each bag to be folded back upon the adjacent end flap as the bag reaches a predetermined point in its travel, devices for adhesively securing the inner end of a sleeve patch to the upwardly directed side of the folded valve extension as each bag tube reaches another predetermined point in its travel, folding means for returning said valve extension to its unfolded condition and folding said patch outwardly over the inner edge of said valve extension during the continued travel of each bag, means for restoring said side flaps to their initial closed position comprising a member traveling in the same direction but at increased speed with said bag tube engaging the underside of said folded side flap and riding over said side flap to fold it against the other side flap, and an oscillating arm for engaging the top side of said valve extension at the base of said folded side flap to cooperate with said member in restoring said side flaps to their initial closed position.

2. In a machine for forming a sleeve valve bag of the class described, which comprises means for feeding gusseted bag tubes longitudinally one behind the other, each bag tube having a valve extension on the advancing end thereof and said end of the bag tube being spread and flattened to provide side flaps and end flaps overlying the side flaps, one of the side flaps being folded against the side of the body of the tube, a folder for causing the valve extension of each bag to be folded back upon the adjacent end flap as the bag reaches a predetermined point in its travel, devices for adhesively securing the inner end of a sleeve patch to the upwardly directed side of the folded valve extension as each bag tube reaches another predetermined point in its travel, folding means for returning said valve extension to its unfolded condition and folding said patch outwardly .over the inner edge of said valve extension during the continued travel of each bag, means for restoring said side flaps to their initial closed position comprising a member traveling in the same direction but at increased, speed with said bag tube engaging the underside of said folded side flap and riding over said side flap to fold it against the other side flap, an oscillating arm for engaging the top side of said valve extension at the base of said folded side flap to cooperate with said member in restoring said side flaps to their initial closed position, and means comprising an arm acting automatically as said side flap is being closed to strike the gusseted portion of the other end flap to restore it to its initial position as continuations of the longitudinal gusseted portion and side walls of the bag tube.

3. In a machine for forming a valve bag of the class described, means for feeding longitudinally a gusseted bag having a valve extension on the advancing end thereof, said end of the bag tube being spread and flattened to provide side flaps and end flaps overlying the side flaps,

said valve extension being a continuation of one of said end flaps, one of the side flaps being folded against the side of the body of the tube, means acting automatically during the feeding of the tube for folding the last-mentioned side flap upwardly and then downwardly towards the other side flap with the valve extension and its associated end flap folded inwardly between the side flaps to form a valve, and a device for simultaneously restoring the gusseted portion of the other end flap to its initial position as a continuation of the gusset and side walls of the adjacent longitudinal portion of the bag tube.

4. A structure according to claim 3 in which the device for restoring the gusseted portion of the end flap to its initial position comprises an oscillating arm acting automatically in timed relation to the feeding of the bag tube tostrike the base of said gusseted portion to force the longitudinal center thereof inwardly during the closing of the side flaps.

PAUL C. ROBINSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,044,476 Koenig June 16, 1936 2,096,788 Coty Oct. 26, 1937 2,325,042 Crawford July 27, 1943 2,387,274 Lee Oct. 23, 1945 2,415,862 Belcher Feb. 18, 1947 2,559,873 Grupe et al July 10, 1951

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