US1690626A

US1690626A - Machine for forming bag bottoms in bag tubes

Info

Publication number: US1690626A
Application number: US746121A
Authority: US
Inventors: Duvall James
Original assignee: CROWN WILLAMETTE PAPER Co
Current assignee: CROWN WILLAMETTE PAPER Co
Priority date: 1924-10-27
Filing date: 1924-10-27
Publication date: 1928-11-06
Anticipated expiration: 1945-11-06

Description

Nov. 6, 1928. 1,690,626

. J. DUVALL MACHINE FOR FORMING BAG BOTTCMS IN BAG TUBES Filed Oct. 27, 1 924 Nov. 6, 1928.

J. DUVALL MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES 2'7, 1924 11 Shcets- Sheet 2 Nov. 6, 1928. 1,690,626

J. DUVALL MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES Filed Oct. 27, 192 11 Sheets-Sheet 5 Nov. 6, 1928.

J. DUVALL MACHINE FOR FORMING BAG 'BOTTOMS IN BAG TUBES Tamer 240a w 4 k 6 6 m h M h 6 m: WWW m a *N 6 9 w u Filed 001:. 27, 1924 1,690,626 J. DUVALL I MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES Nov. 6, 1928.

' Filed Oct. 27, 924 11 Sheets-Sheet 5 Ndv. 6, 1928.

1,690,626 J-, DUVALL MACHINE FOR FORMINGBAG BOTTOMS IN BAG TUBES Filed Oct; 27, 1924 11 snets-sheet s Nov. 6,1928. T 1,690,626

. J. DUVALL MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES Filed 001;. 27, 1924 ll Sheets-Sheet '7 Nov. 6, 1928. 1,690,626

J. DUVALL MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES Filed Oct. 2'7, 1924 ll Sheets-Sheet 8 Nov. 6, 1928.

J. DUVALL MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES ll Sheets-Sheet 9 Filed Oc't. 27, 1924 Nov. 6, 1928.

J. DUVALL I MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES Filed Oct. 2'7, 1924 11 Sheets-Sheet 10 Nov. 6, 192 1,690,626

, .I. DUVALL MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES Filed Oct. 27, 1924 11 Sheets-Sheet 11 Patented Nov. 1928.

UNITED STATES PATENT OFFICE.

JAMES nnv LL, or CAMAS, WASHINGTON, ASSIGNOB T cnown WILLAMETTE PAPER COMPANY, or SAN FRANCISCO, CALIFORNIA, A conrom rron or DELAWARE.

MACHINE FOR FORMING BAG BOTTOMS IN BAG TUBES.

Application filed October 27-, 1924. Serial No. 746,121.

. The principal object of my invention is to provide an eflicient machine operating upon a bag-tube to form therein the bag-bottom; said machine to be dependable in its operations, and at thesame time to operate at efficient speed.

In this connection one of the main objects of my invent-ion'further is to provide a machine adapted to operate upon bag-tubes, or

0 blanks, of relatively large size and made of thin paper. These bag-tubes frequently lack sufficient stiffness to prevent their walls from collapsing, and hence require-the providing of means by which the bag-tube will be firmly supported and'held in position during the bag-bottom forming operation. In this connection my invention has for its particular object the providing of'a machine especially adapted for making a lining bag of the type described in my application for patent entitled Dust and insect proof package filed June 14, 1923, Serial No. 645,434.

An incidental object of my invention isto provide a machine in which the bag-bottom I making devices are grouped around, and carried by a single cylinderwith the latter of such size, and the said devices so arranged about the cylinder that a number of bags may be made in a single revolution of the ac cylinder.

' A further object of my invention is to hold the blank firmly on the cylinder throughout the bag-bottom forming operations of my machine; that is to say, by means which will 1 assure that the blank is at all times properly positioned relatively to the bag-bottom forming devices. In prior machines ofthis type, it was attempted to hold the bag-tube in position by belts; but belts will stretch and slip,

I and as a result the bag-tube gets out of position relatively to the creasing and folding devices by which the bag-bottom is formed, and a number of bags will be imperfectly made and mustbe thrown away.

A further obj ect of my invention is to provide eficient means for separating the bagtube portions to be formed into the bag-bottom; this operation being performed in my machine by the aid of means provided on the 66 cylinder for seizing and holding the forward end of one of the walls of the bag-tube, and complementary holding means provided on an auxiliar inder, for holding the forward end of the other of said walls; the latter means being adapted to yield to the pull of said holdin means on the main cylinder when separate portions of the bag-tube are in tension.

A further object of my invention is to provide, in combination with said means for separating the forward-ends of the bag-tube, other means operating first to crease the bagtube transversely, and then to seize and hold the bag-tube at said crease, so that the latter will constitute the hinge on which the diamond forming portions of the bag-tube are separated and folded.

Furthermore, to provide in combination with the means last referred to, arms arranged to bear circumferentially on the main cylinder, and to function as forming elements against which the sides of said forward-bag.- tube portions, forming the diamond of the bag-bottom, are drawn during the separation and folding of said portions.

A further object of my invention is to provide, in a machine of the character referred to, creasing and gripping devices comprising a cylinder provided with-a transverse recess, a cooperating presser-roll provided with a 'circumferentially projecting tucker-blade operating to increase the bag-tube by pushing it into said recess, a gripper-bar journaled for rotation within said recess, means normally causing it to bear against one side-wall of said recess, and means for moving said gripper-blade from said side-wall to permit the insertion of said tucker-blade. In this connection, furthermore, I so arrange my tucker-blade as to be adapted to yield to rotation, so that it may become positioned tangentially with said roller by which it is carried, thereby to facilitate the withdrawal of said tucker-blade from said recess of the cylinder.

The foregoing. features of my machine as well as others incidental thereto, are here1nafter more fully described with reference to the accompanying drawings.

In said drawings:

Figs 1 to 8 inclusive, are. progressive diagrammatic views showing the successive steps performed by my machinefupon the tubular blank passing over the rotating cylinder and roller, located adjacent the cylshow the approximate position of each operation and its relation to the rotation of the cylinder;

Fig. 9 is a plan view of my machine, taken substantially on the line 99 of Fig. 10 and shows a portion of three successive bags, and thus illustrates three steps of the bottom forming operation;

Fig. 10 is a longitudinal section taken approximately on the line 1010 of Fig. 9, this View diagrammatically showing the relationship of the auxiliary devices to the rotatable cylinder, the relative directions of rotation of the parts being indicated by arrows;

Figs. 11 and 12 are fragmentary perspective details of construction;

Fig. 13 is an end elevation taken in the direction of the arrow 13 in Fig. 9;

Fig. 14 is a section taken on the line 1et.14 of Fig. 13, diagrammatically showing the action of the slitting mechanism;

Fig. 15 is an enlarged sectional View and further illustrating said slitting mechanism, the slitter head being shown as having been rotated somewhat;

Fig. 16 is a perspective section taken at the line 1616 of Fig. 15;

Fig. 17 is a side elevation taken in the direction of the arrow 17 in Fig. 13, parts having been broken away to disclose details of construction;

Fig. 18 is a side elevation of my machine taken in the direction of the arrow 18 in Fig. 13, parts having been broken away here also to disclose details of construction and the relationship of the parts to each other;

Fig. 19 is a fragmentary detail of the side grippers which are arranged at each side of the cylinder;

Fig. 20 is a fragmentary section taken on the line 2020 in Fig. 19;

Fig. 21 is a fragmentary perspective view,

with parts broken away, of the rotating cylinder and the auxiliary opening roll;

Fig. 22 is an end elevation taken in the direction of the arrow 22 in Fig. 9;

Figs. 23 and 24 are fragmentary views showing details of construction and operation of one tucking and creasing blade;

Fig. 25 is a perspective view of my bag machine, looking approximately in the direction of the arrow 22 in Fig. 9;

Fig. 26 is a diagrammatic fragmentary view, showing the opposite walls of the forward end of a bag-tube (distinguished by stippling) as separated and held by the cylinder and the roll of mymachine the first crease in the bag-tube has been made, and the bagtube is being firmly held at its side on the cylinder adjacent said crease, and this figure illustrates that the holding means of the roll are adapted to yield to those of the cylinder, after the said wall portions have been separated, and are in tension. This figure further illustrates the arrangement of the arms or forming elements against which the sides of said separated wall-portions are drawn to form the diamond of the bag-bottom.

Figs. 27 and 28 show the bag-tube in progressive stages of being folded;

Fig. 29 shows a bag having a bottom formed therein and in position for being filled.

Figs. 30 and 31, respectively, are fragmentary views of the main cylinder and cooperating roll of my machine, and illustrate the devices provided for seizing and holding the forward-end of the bagtube to said cylinder and said roll and the action of the holding devices or pins provided on the cylinder.

Fig. 32 is a fragmentary view illustrating,

diagrammatically, the construction and oper ation of the devices provided in my machine for making the first crease in the bag-tube, and for holding the latter firmly on the cylinder at such crease, after it has been made, so that said crease will function as a hinge, located at a predetermined line, on which the forward end of the upper wall of the bag-tube is folded in forming the diamond of the bag-bottom.

And Figs. 33 and 3 1 in connection with Fig. 23 illustrate the construction and action of the devices provided in my machine for making a second and third crease in the bag-tube, during the bottom-forming operations, and for holding the bag-tube firmly on the cylinder by the gripping of these creases, so that the proper folding of the forward end of the bag-tube back upon its body is assured; the consecutive operations of these devices being illustrated by the Figs. 33, 34 and 23 in the order named.

My machine comprises a frame 2 made'up of two spaced side frames 2 and 2 which support a rotatable main cylinder 3 journaled between them. A number of auxiliary de vices are arranged circumferentially about said main cylinder 3 and cooperate therewith to perform the various steps upon the tubular blank 4 for making the bag bottom therein.

These steps are diagrammatically illustrated in their sequence in Figs. 1 to 8 inclusive. The tubular blank 1 is fed to the cylinder endwise and the cylinder and the various auxiliary devices form a bottom in the forward end P. The machine cuts

parallel slits

1 and 4 through both sides of the tubular blank. These slits extend longitudinally inwardly from the forward end 4" and divide each side of the forward end of the blank into three portions,

side portions

4 and 4 and a middle portion, in each side wall of the bag, 41 and 4 1f the bag is to be used as a lining bag, slits 4) and 1 are also cut in the opposite end 41" of said tubular blank.

Bag gripping pins 5, Figs. 18 and 21, are provided 011 the main cylinder 3 and releasable grippers 6 are'provided on an oppositely rotated auxiliary roll element 24; composed of segments 24, 2& and 261, Fig. 9, and during the rotation of the cylinder 3 and the auxiliary roll 24, said pins and grippers pull the

portions

4 and 4 of the tubular blank in opposite directions. the tubular blank below the inner ends of the

slits

41 and 4, and sidegrippers 7, Figs; 4, 8 and 21, at each side grip the fiat tubular blank, just below the said crease 4 These grippers hold the blank tightly against the cylinder, as shown in Fig. 2. As the pins 5 and grippers 6 pull the blank open the portion 4 is folded backwardly against the remainder of the blank on the periphery of the cylinder 3 along the crease 4* and over the forward edge of the side grippers 7 as is shown in Fig. 3. The sides of the bag-tube are drawn inwardly on angular lines converging at the ends of the crease 42. The grippers 6 are then released and the cylinder rotates until the tubular blank 4: passes over the highest point of the cylinder. During this movement the bag is pasted in a U- shaped pattern 4*, along the edges which are subsequently to be overlapped. The blank is then creased at 4 (see Fig. 5).

The cylinder is provided with a groove in which a creasing and tucking blade 87 seats and this groove grips the tubular blank along said crease 4. Said gripping of thetubular blank at this point lifts the portion 4: from the periphery of the roll, as shown in Fig. 6,

- thus permitting the folding roll 8 to strike the portion from underneath and to fold this portion 4 back upon the portions e and 4 of the tubular blank. A similar crease is made at 4? (see Fig. 6). The blank is also the forward edge of the bag-tube, as folded,

reaches the turning element 9. Said turning element folds the bag upon itself along the crease 4? so that the forward end as folded is the tubular blank is formed into a bag. Reference will be made to the other figures of the drawings.

The bag forming machine performs "a seriesof progressive steps, and each step is so timed. that' the blank is fed continuously through the machine without interruption. All of the parts of the machine are mounted upon theframe 2 and most of the mechanism, except some of'the' driving connections, are carried between the-

frame sides

2 and 2*. I

A crease 4 is formed in.

will describe the parts of my machine in the order in which they operate upon the bagtube from which the bag is zgiade.

Tubular blanks are fed-intothe machine frqmthefeeding table 10. Each blank isarranged longitudinally thereon, that is, with the open end 43 towards the machine. A longitudinal uiding ledge 10 at one side of the feeding table, and two guiding stops 11, arranged transversely of the latter, position the blanks for the feeding mechanism. The stops 11 are depressed periodically to permit the feeding mechanism to pass said blank to the cylinder, said stops 11 being timed to release the paper slightly in advance'of the gripping of said tubular bag tube by the feeding mechanism.

The feeding mechanism is arranged partly above'and partly below the path of the tubular blank, both parts being supported by the bracket 12, made up of two side pieces 12* and 12 The feeding mechanism above the blank is supported upon a transverse shaft 14 which is journaled between the bracket sides '12 and 12 the

sides

12 and 12 being longitudinal extensions of theside frames 2* and 2 respectively. One end of a shaft 14 extends thru bracket side 12 and a gear 15 is fixed thereto. A plurality of feeding segments 16 are also fixed to said shaft 14 and as they rotate are in contact with the tubular blank 4 for a portion of a rotation and feed the blank forward while they are thus in contact. A corresponding number of feed rollers 17 are arranged below the path of travel of the tubular blank and are alined with the feeding segments 16, the peripheries of said rollers and segments gripping the tubular blank between them, to feed the blank to the main cylinder 3. The feed rollers 17 are fixed to a transverse shaft 18, which is also journaled between the bracket sides 12 and 12*, directly beneath the shaft '14. The depressible stops 11. are fixed to a rock shaft 19 which is journaled between the bracket sides 12 and 12 said rock shaft 19 being controlled by a segment 20 fixed to the shaft 14. The segment 20 depresses a lever 21 fixed-to the rock shaft 19 once during .each revolution, and a spring 22 returns the lever 21 to its original position.

Thus, after one blank has been fed to the folding devices by the feeding segments 16 another blank may be placed on the feeding table and be positioned by the guiding ledge 10 and the depressible. stops 11 so as to be picked up upon the succeeding rotation of the segments 16. Since said feeding rolls are formed in a number of segments,they per mit the forward end of each succeeding blank to be fed into position before the rearward end of the previous blank has been moved forward. If flexible lining bags for packing boxes are to be formed by my machine which are somewhat shorter than the usual bag blank may be placed under the rearward end of the preceding blank and thus held flat and drawn into the machine. This is only possible because the shorter blank permits the succeeding one to be carried into the machine properly positioned relatively to the preceding bag. The feeding table 10 is provided with a plate 23, one end of which is shown in Fig. 11, and which provides a continuous surface along which the tube may be fed and the forward end 23 of the plate 23 is curved upwardly toguide the tubular blank from a horizontal plane to substantially a vertical plane. Thus the blank strikes the main cylinder 3 substantially at a tangent thereto, as is shown in Fig. 10. Said sheet metal covering also performs another function. Lying within this curve 23 is an auxiliary roll 24 which is preferably made up ofanumberof roll

units

24, 24 and 24 at each side of the longitudinal center line of the machine, Figs. 9 and 13. Said roll 24 is made sectionally in this manner for lightness, and to reduce the cost of construction, as well as to allow adjustment of the slitting mechanism, hereinafter described. Said roll units are fixed to a transverse shaft 25 journaled between the side frames 2 and 2 and carrying at one end a driving gear 26. The gear 26 meshes with the gear 15 for the feeding mechanism thru an idler gear 27 mounted on a trunnion 28 on the bracket side 12. On the periphery of the roll 24 between its two units 24, I provide gripping mechanism 6. (See Figs. 14, 15 and 21.) This gripping mechanism is made up of a rotatable releasableclamp or gripper29 mounted ona rock shaft 29, which clamp cooperates with fixed clamping bar 29, extending longitudinally of the roll 24. A tubular blank is fed under the roll 24 and the operation of this clamp n'iechanism is timed so that when the paper is approximately at the end of its movement forward by the feeding mechanism, the clamp 29 grips the portion 4 of the uppermost wall of the blank at its forward edge 4, and continues its movement forward. This is shown diagrammatically in Figs. 15 and 16. The rock shaft 29 is journaled transversely of the roll 24 and at one end is provided with a crank arm 30 carrying an anti-friction roller 31. The latter rides on the face of the cam 32, which is fixed to the bracket side 12 by a number of studs The position of the cam 32 is therefore fixed, and the rock shaft 29 is mounted on the roll member off-center and thus as the roll 24 rotates in the frame, the rock shaft 29 describes a circle about the transverse shaft 25. The anti-friction roller 31 on the arm 30 bearing upon the non-circular face of the cam 32 thus rocks the shaft 29, to open and close the clamp 29. The roll 24 has the same peripheral speed as the feeding segments 16 and thus the blank 4 moves to the roll at the same speed as the peripheral speed of said roll 24. The moving of said blank to said roll in this manner permits a certain amount of variance in the closing of said clamp 29 against the clamping bar 29 because the forward end 4 of said blank moves uniformly with the roll 24 along the feeding table, and is guided about said roll by the up turned end 23" 0f the sheet mounted on said feed table.

The slitting mechanism consists of one or two sets of rotatable slitting heads 36 spaced apart and rotated in a Vertical plane. If lining bags for packing boxes are to be made, I use two sets of slitter heads to slit both ends of the bag-tube, but if ordinary bags are being made, a single set is used to slit the forward end of the blank in which the bottom is formed. Said heads are clamped to a rotatable shaft 37 ournaled transversely between the bracket sides 12 and 12. The end of the shaft 37 which extends through the bracket side 12*, carries a driving gear 38 which gear meshes with the driving gear 82 through an idling gear 45 mounted on the trunnion 45 which trunnion extends outwardly from the frame side 2". Each slitting head 36 is V- shaped in cross section as is shown in Figs. 15, 16 and 17. The shaft 37 extends through the converging ends of said slitter heads and each of the diverging ends thereof is provided with a circular segmental serrated slitting blade 36 These blades are relatively thin and are adapted to fit closely within the slot 39 cut in the face of the roll unit 24. The slitting heads 36 and the roll unit 24 rotate in opposite directions and have the same peripheral speed and thus the slitting blade cuts the

slits

4 and 4 of equal length to that of the blade. The blade 36 is fixed in the rim 36 of each of said heads by screws 41 and normally lies below the upper faces of two yieldingly mounted shoes 36", which are mounted on said rim 36 at each side of the blade, as is shown in Fig. 17. These depressible shoes are mounted on pins 40 which extend through said rim 36 and extend into holes in the hub 36 alined with the holes in the rim 36. Coil springs 4O are mounted about these pins, one end of each spring bearing against the hub 36 and the other end against a nut 40 on the pin 40. Said spring normally tends to hold the nut against the underside of the rim 36, as shown in Fig. 15. When the shoes 36 bear against the roll 24, they are forced down wardly against the rim 36 and thus uncover the slitting blade 36 which blade extends into the slot 39 cut in the face of the roll unit 24. The shoes thus bear against the roll 24 and grip the tubular blank against the roll and tend to feed it forward as long as the shoes are in contact with the roll 24. Said shoes at ach side of the blade also tend to hold the paper taut across the blade to cause a perfect out which tensioning devices are essential, especially if the paper is of light weight. Each blade 36 preferably is provided with holes 42 which are elongated radially to the shaft 37 and thus the distance each blade extends above its shoes, when depressed, may be adjusted to the Conditions at hand.

As shown in Fig. 21, I provide a coil spring 34 fastened at one end to the pin 35 on the roll unit 24 and at the other end to the rock shaft 29. Said spring tends to hold the antifriction roll 31 against the face of the cam 32, as well as to "hold the clamp 29 firmly against the bar 29 and the forward end of the bag-blank.

I preferably make the main cylinder 3 large enough to accommodate more than one bag during each revolution, and in the machine shown in the accompanying drawings this cylinder is shown as large enough to operate successively upon 3 bag-tubes during a single revolution, the three sets of operative mechanisms upon said cylinder being spaced 120 degrees apart. The operative mechanisms are identical in physical structure as well as in operation and thus I will only describe one set of said operative structures and it is to be understood that the similar parts in the other operative mechanisms will'be referred toby the same reference characters.

After the tubular blank has been slit-ted at one or both ends it is gripped at 4 by the rotatable clamp 29 on the roll 24 and the portion 4 of the bag-blank is caught by the pins 5 on the main cylinder 3. When the tubular blank is held by said pins and said clamp a transverse crease 4 is made across the tubular blank intermediate its ends and at a point a predetermined distance from the inner ends of the

slits

4 and 4 made in the forward edge of the bag. Said crease is made by a blade 43 mounted transversely along the auxiliary roll member 24 which blade seats in a groove 44 on the periphery of the main cylinder 3.

The retractable pins 5 are mounted on a rock shaft 46 (see Fig. 21) which is journaled transversely of said main cylinder 3 and is mounted in a plurality of bearings 47 carried in a transverse slot 53 in the periphery of said main cylinder. A cmnk arm 48 fixed to one end of said rock shaft 46 carries an anti-friction roller 49 which engages the face 50* of the cam 50. This cam is slightly smaller in diameter than the main cylinder 3 and is fastened to the side frame 2 by bolts 50. Said cam 50 is provided with a recessed portion 51, said recess terminating in a relatively sharp shoulder 51 at one end as shown in Fig. 18 and terminating in a rather gradual shoulder 51 at the other end. The

sharpness of the shoulder 51 permits a spring 52 to retract the pins 5 very quickly to release their hold upon the bag-tube speedily so as not to interfere with other holding mechanisms for said bag-tube. The pins are raised to operative positions by the inclined shoulder 51 and inasmuch as said pins do not have to be in exact time with other operating devices, they can be moved at a slow rate of speed. An apertured plate 54 covers the middle portion of the said transverse slot '53 in which pins and their control mechanism are mounted, the pins 5 passing through aper-' tures 55 in said plate 54. The unperforated portion of said plate thus acts as a support for the bag-tube when it is held to the cylinder by said pins.

The peripheral speeds of the auxiliary roll member 24 and the main cylinder 3 are the same but because these rolls rotate in opposite directions they space the wall portions of said bag-tube from each other because said wall portions are gripped by devices carried upon diiferent members. When said roll member and said cylinderrotate to spread these side portions apart the clamp 29 on the roll 24 also bends the portion 4 of said bag tube back upon the body portion, along the crease 4*.

I provide side gripping members 7 at each side of said main cylinder 3 which grip the bag-tube to the cylinder at points adjacent each end of said crease 4 this being diagrammatically shown in Fig. 2. Said side gripping members 7 are shown in detail in Figs. 19 and 20 and their relative positions on the roll are shown in the perspective view Fig. 21. The side grippers are mounted upon a spider which is fixed to shaft 61 on which the main cylinder 3 is also carried. A bifurcated pivot 62 is fastened to the spider 60 by bolts 63 and the gripper 7 is pivotally mounted between the bifurcated portions on a pin 64. Thus each gripper pivots in a plane radial to the main cylinder 3. The gripper 7 is provided with a bent fiat finger 7 which is fastened thereto by a screw 7 and the lower end of the gripper 7 is provided with an antifriction roller 7 mounted on the pin 7 Said anti-friction rolleron gripper 7 rolls along a circular cam 65. Thereare two of these cams, one on each side of the main cylinder 3. One of these cams is fastened to the inner face of the cam 50 and the other is fastened to the inner face of a similar cam 67 which is mounted on the opposite side of the cylinder 3. The circular cam 65 is fastened to the cam 50 by bolts 66 and the cam 65 is fastened to the cam 67 by bolts 66*. As is shown in Fig. 21, one end 65 of this cam 65, is tapered so that the anti-friction rol1er 7 may readily grippers 7 are moved into'operative position 7 by the springs 68.

When the clamp 29 on the auxiliary roll 24 spaces the

wall portions

4 and 4 apart the clamp 29 continues to grip the portion 4 of the tubular blank until it has been bent back upon the remainder of said tubular blank along the crease 4*, said tubular blank then assuming the position shown in Fig. 3.

Idling rollers 56 are mounted on a rod 56 which is supported on pendant arms 57,

mounted on a transverse shaft 57, and which are held against the periphery of the roll 24 by the action of a spring 58, sufiiciently to tension the bag portion 4 on the roll 24 and yet to allow the said portion 4 to yield to the pull of the tubular blank as the said portion 4 is withdrawn by the rotation of the main cylinder 3.

Curved, rod-like guide arms 59 are fixed to the transverse rod 56 and bear against the periphery of the main cylinder 3 as shown in Figs. 9 and 12 and serve to guide the folds of the tubular blank in forming the diamond. As the portion 4 of the bag blank is drawn forward by the main cylinder 3 and the portion 4 is drawn rearwardly over the roller 24, the

side portions

4 and 4 tend to be drawn upwardly and inwardly as shown in Fig. 2. At this point, the forward end of the bag blank, the portion 4 is drawn under the guide arms 59, and the

side portions

4 and 4, having been drawn inwardly and upwardly are drawn and folded down over the guide arms by the continued separations of the

portions

4 and 4 and serve to guide and position the bag blank so that the said portions will be folded accurately and uniformly, thus forming angular folds converging at the ends of the crease 4*, as the bag portion 4 is drawn about the roll 24 and under the idling rollers 56, thus having formed the diamond of the bag bottom.

The cylinder is then rotated so that it passes under the paster roll 69 which applies paste in a U-shaped pattern 4 to the tubular blank along the portions which are subsequently to be overlapped.

The pasting mechanism consists of a. trough 70 which holds a quantity of paste and a past-e supplying roll 71 which rotates in said trough to which paste adheres. This roll is mounted on a transverse shaft 72 which is journaled between the side frames 2 and 2*, said shaft being driven by an operating gear 73. I provide a paste transferring roll 74 which is mounted on the transverse shaft 75 extending transversely across the machine journaled at each end in brackets 76 mounted on the side frames 2 to 2 The paste transferring roll is provided with a paste applying segment 77, which contacts with the paste supplying roll 71 during a portion of each revolution. The shaft 75 on which this paste transferring roll is mounted is provided with an operating gear 79 at one end outside of the frame side 2". The paster roll 69 is mounted on a trans- The gear 81 for the paster roll is driven by A the main gear 82 fixed to the shaft 61 for the main cylinder 3. The paster roll 69 is provided with a U-shaped paste applying sector 83 which contacts with the paste supplying segment 77 on the paste transferring roll 74 and with the tubular blank 4, once each revolution and applies paste to the sections which are to be subsequently overlapped.

The pasted tubular blank is then passed on to the creasing mechanism by which the trans verse folding creases are formed, along which the bottom folds are made. A creaser roll 84 is made up of

roll units

84 and 84 at each side of the longitudinal center line of the machine and these roll units are clamped to the shaft 85 which extends transversely across the machine, said shaft being journaled between the frame sides 2 and 2". 'Said creaser roll shaft 85 is driven by an operating gear 86 which meshes with the gear 82 of the main cylinder. The creaser roll 84 is provided with two creasing and

tucking blades

87 and 88. I will term the crease 4*, made by the blade 87, the second crease, and term the crease 4 made by the tucker 88, the third crease. The tucking blade 87 is adapted to cooperate with transverse gripper blade 89 on the main cylinder 3 and the tucker blade 88 is adapted to cooperate in the forming of the crease 4 with the transverse blade gripper 90 on the main cylinder.

The circumference of the main cylinder 3 is provided with a transverse channel 91. In this channel bearing blocks 92 are located, as shown in Fig. 31. The face 92 of the bearing blocks 92 lies below the circumference of the c linder 3, and on such faces 92" is mounted a ar 92. In the bearing blocks 92 is journaled a shaft 93 carrying a gripper-blade 89. One end of the shaft 93 is provided with a radial pin 97*, to which is attached spring 97, the latter functioning to hold the gripperblade 89 normally against the bar 92*. The opposite end of the shaft 93 is provided with a cam-arm 94, having a cam-roller 95 which bears on the stationary cam-plate 67 fixed to one side of the frame. The cam-plate 67 has a portion 67 of longer radius than the portion 96 (compare Figs. 10 and 21). The connecting portion 96 between said cam surfaces 67 and 96 is relatively abrupt to allow the gripper bar to be quickly actuated and the connecting portion 96 of said cam surfaces is made more gradual so as to facilitate the climbing of the cam-arm 94 to the higher surface. In viewing said second crease-forming devices as positioned in Fig. 21, the camsaid second crease 4 is illustrated in Figs.

33, 34 and 23. In Fig. 33 the gripper-blade 89 is shown as having been spaced from the bar 92 so as to accommodate the inserting of the tucker blade 87. In Fig. 84 the tuckerblade 87 has entered and pushed with it the blank walls into the space between the gripper-blade 89 and the bar 92, thus forming said crease 4. At this point the cam-arm 94 of the gripper-blade 89 has been dropped so that the spring 97 may function to cause the gripper-blade to bear against the crease 4 and in so doing hold it in the space between the gripper-blade 89 and the bar 92*; In the further rotation of the cylinder and the creaser roll 84, the pants are positioned as shown in Fig. 23, the tucker-blade 87 being pulled from between the gripping-blade 89 and bar 92 and the former then pinches the crease 4 of the blank against the bar 92 In order to prevent the tucker-blade 87 from forcing the gripper-blade 89 from the bar 92, and also to prevent the tucker-blade from tending to pull the crcaed portion 4 of the blank out with it, while the tuckerblade is being withdrawn "from between the gripper-blade 89 and the bar 923during the further rotation of the creaser roll 84, the

tucker-blade is mounted on a rock-shaft 87", and such rock-shaft is controlled by a spring 87 the tucker-blade 87 is being withdrawn as mentioned it may tilt, so as to lag. and ride over the gripper-blade 89 without any tendency to pull out with it the creased blank portion 4.

Shortly before the crease 4 has been made, as described, the pins 5 are retracted by re tating of the arm 48 in a clockwise direction,

1 Fig. 21, caused by the anti-Liction roller 49 passing over the; shoulder 51*. Shortly after the gripping blade 89 grips the tubular blank 4 along the crease 4, the side grippers 7 also are released, due to the anti-friction rollers 7c thereon, climbing up the tapered face 65 of. the circular cam 65. The tubu- Thus, as illustrated in Fig. 23, when' journaled transversely of the main cylinder 3 in spaced bearings 99 which are recessed in the transverse groove 100 in the main cylinder .3, so that the upper face of the hearings will lie below the periphery of said main cylinder. The rock shaft 98 is provided with a crank arm 101, having an anti-friction roller 102 which rides upon the cam face 50 of the cam 50. When the anti-friction roller 102 passes over the shoulder 51, it permits the spring 103 to rotate the crank in a counter-clockwise direction as viewed in Fig. 21, and thus forces the gripping blade against the bar 99*. When the creasing blade 88 tucks the tubular blank alongside of the blade 90, as it does when it is forming the crease 4 it permits the gripping blade 90 to grip the tubular blank along the crease 4 The cams are so arranged that the

gripping blades

89 and 90 both grip the tubular blank for a portion of a revolution. The gripping of the tubular blank by the gripping blade 89 causes the portion 4 of the tubular blank to be lifted from the periphcry of the roll, as shown in Figs. 6 and 10, and thus, permits the presser roll 8 to strike this portion 4 from underneath so as to fold this portio-n4 back upon the remainder of the bag body. and to make the second fold.

Said roll 8 is mounted on a transverse shaft 104 which is journaled between the frame sides 2 and 2". Said roll 8 is made in two sections so that it will straddle the tubular blank at its middle because on this portion of the tubular blank the paste is still uppermost. Immediately after the crease 4 has passed under the presser or ironing roller 8, the blade 89 is released, the roller having passed off the shoulder of the cam 67.

The continued rotation of the main cylinder 3 causes the blank to be moved under the roller 8 and the forward end as folded to be forced into the turning rack 9, which is in its down position, as shown in dotted lines in Fig. 10. Said turning rack is made up of a number of U-shaped members 9*, each provided at one end with a hub 9 and these hubs are mounted on a transverse rod 105 supported at its ends by

arms

106 and 106, fixed to the rock shaft 107. The latter is journaled transversely of the machine between the frame sides 2 and 2 and extends beyond the frame side 2 and has a pinion 108 fixed thereon.

The shaft 85 on which the creaser roll 84 is mounted also extends out beyond the frame side 2 and a cam 109 is fixed on its end. as is shown in Figs. 9 and 18. A connecting rod 110, which has a forked end 110 fits over and rides upon the shaft 85. The two branches of this forked end are connected by a cap 111, held by two cap screws 112 and a cam follower 113 is rotatably supported at one side of this cap, the follower 113 riding upon the face 109* of the cam 109. A toothed rack 114 is cut on the under side of the opposite end 110 of the connecting rod and said rack meshes with the pinion 108. A guide 115 is pivotally supported on one slde of the frame 2 at a point above the pinion 108, which guide holds the rack 114 in operative relationship with the pinion 108. lrVhen the cam 109 moves to the position shown in Fig. 18, it rocks the turning element 9 to a vertical position and the continued movement permits the spring 116 to retract the connecting rod so as to cause the turning element 9 to assume the position shown in dotted lines in Fig. 10.

The tubular blank is then passed behind the pressing roll 117, which is guided and supported by the member 118, and presses the pasted and overlapped surfaces together. The blade 90 then releases the crease 4 as the roller 102 has then passed off the shoulder of the cam 50 which is the last step in the operation of my machine. The bag then is dropped and guided to a pile by the guide arms 119.

Power is supplied to the machine from any convenient source, by means of the belt 120 which is mounted over the pulley 121 fixed to the shaft 122, which is journaled between the frame sides 2 and 2". The pulley is mounted outside of the frame 2 and lies in a plane outside of the train of driving gears. A gear 123 is also fixed to the shaft 122 and said gear 123 meshes with the idling gear 45, as shown in Fig. 17. The idling gear meshes with the main gear 82 which is keyed to the shaft 61. Mounted about this main gear 82 are a number of gears which drive the various mechanisms. The gear 124 mounted on the shaft 125 upon which the presser roll 117 is mounted, meshes with this gear and is rotated in a counter-clockwise direction as shown in Fig. 17 A gear 126 is fixed to the transverse shaft 104 which carries the creasing roll 84, the latter gear also is driven by said main gear 82 in a counter-clockwise direction, as shown in Fig. 17. The gear 86 fixed on the shaft 85, on which the creasing roll 84 is mounted also is rotated in a counterclockwise direction. The gear 81 which rotates the shaft 82 on which the paster'roll 69 is mounted, meshes with the gear 82 on one side and meshes with the gear 79 on the other. The gear 81 is rotated in a counter-clockwise direction and thus rotates the gear 79 in a clock-' wise direction. The gear 79 is fixed to the shaft 75, on which the paste transferring roll is mounted. The gear 73 which rotates the shaft 72 on which the paste supplying roll is mounted, meshes with the gear 79 and is driven in a counter-clockwise direction thereby.-

The gear 82 also rotates the train of gears by which the-mechanism at the forward end of my machine is rotated. This train of gears consists of the gear 26 mounted on the shaft 25 on which the auxiliary roll 24 is mounted. Said gear 26 meshes directly with the gear 82 at one side and at the other side meshes with .fecd rolls 17 are mounted. The gear 13 for the lower feed rolls, thus rotates in a clockwise direction. The gear 15 for the upper feed rolls rotates in a counter-clockwise direction, the idling gear 27 moves in a clockwise direction, and the gear 26 for the auxiliaryroll 24 rotates'in a counter-clockwise direction. The slitter mechanism is driven directly from the idler gear 45, the operating gear 38 therefor, being mounted on the shaft 37. The idler gear 45 rotates in a clockwise direction and therefore rotates the slitter mechanism in a counter-clockwise direction.

The operation of my machine is as follows:

In practice a pile of bag-tubes, or blanks 4, is placed upon the feeding table 10 with one side of the pile against the guiding ledge 10 of the table. The top blank of said pile is moved forward by hand; one side of such blank being kept against the guiding ledge 10 and its forward end 4 being brought against the stops 11.

The portion 4 of the tubular blank is preferably made with a lip, which extends slightly beyond the companion portion, 4 of the other wall of the blank. The blanks are so placed on the table 10 as to bring uppermost the portion 4 The feeding sectors 16 in each revolution feed the blank-previously placed under them to the bottom forming mechanism; the stops 11 simultaneously being depressed to permit the blank to be moved forward.

The depression of stops 11 is accomplished by the cam sector 20 hearing on the arm 21, rigid on the rock-shaft 19, the latter carrying, said stops 11.

During such forward movement the clamps 29, carried by the roll 24 are in the position shown in Fig. 14, that is they have been 1 opened so as to seize the portion 4 of the tubular blank. The sectors 16 continue to move the blank forward until the'clamps 29 of the roll 24 have closed. At this point the sectors 16 let go of the blank, and further movement of the latter is accomplished by the rotation of the roll 24. During the latter forward movement of the blank its forward end is also guided by the curved, forwardend 23 of the plate 23, so as to prevent the under wall of the blank from dropping down; in other words, said curved plate-portion 23 supports said under wall.

Simultaneously with the movement of the blank forward the slitting of its forward end is accomplished. As shown in Fig. 15 the units 24 of the roll 24 are provided with circumferential cavities 39, for the knives 36 of the slitters 36 to operate in. As shown by Fig. 16, the slitter-head 36 comprises portions 36 which are supported by rods 40, and normally are projected by springs 40. Hence, when the slotted port-ions 39 of the units 24 of the roll 24, bear on the portions 36 of the slitter-heads said portions are depressed and the knives 36 work in the slots 39. The slitter-element of my machine as shown in Fig. 14 represents-two siitterhead units 36, so positioned on the shaft 37 that one of said slitter-head units will cut the slits 4 at the forward end of the blank, and the other slitter-head unit will cut the slits 4" at the rear end of the blank. This arrangement of the slitter heads is particularly designed to make the slits in the blank of a lining-bag of the type represented in Figs. 28 and 29. In case. only the first slits 4 are to be cut as would be the case in formingthe usualbag-bottom, one of the slitter units 36 would be eliminated.

The roll .24, as mentioned, comprises units 240 which are spaced as shown in Fig. 9. During the rotation of the. main cylinder 3 the pins 5carried by the rock-shaft 46, journaled in said cylinderhave been projected and positioned as shown in Fig. 30. The further rotation of the main cyllnder 3 drives these pins through the forward end of both walls of the blank, in the space between the units 24 of the roll 24. The cooperative rotation of the main cylinder 3 wall of the. blank being pulled from the pins 5.

During the interval the cylinder 3 and the roll 24 are rotated to pull said blank-ends in opposite directions the creaser blade 43 presses both walls of the blank into the creaser slot 44 in the cylinderto make the first crease 4, see Fig. 2; the parts 43 and 44having become positioned as illustrated in Fig. 32. Immediately after the first crease 4 has so been formed, the clamps 7*, provided at each side of the cylinder 3 and movable laterally onto and from the cylinder, are closed and grip the sides of the blank just below said crease 4 The clamps 29 of the roll 24 continue their hold on the forward end 4 of the upper wall of the blank until such forward end has been pulled under the friction rollers 56. These rollers are loosely mounted on a shaft 56- (see Fig. 9)'carried by the pendent,

arms 57, fast on the spring controlled rockshaft 57. While the forward end of the bag-tube is being opened by the pulling of the forward ends of its opposite walls in as forming elements against which the sides of the forward open end of the bag-tube are drawn to form the diamond of the bottom (I); the bag, as shown at 4 in Fig.3 and Tu the continued rotation of the cylinder 3, the friction rollers 56 permit the rear portion of the blank to be pulled from under them. The forward end of the lower wall of the blank is still held by the pins 5 the sides of the blank are held by the clamps 7, and the diamond forming arms 59 still hold the body of the blank on the cylinder'3.

The clamps 29 of the roll 24 do not release their hold on the forward end 4 of the blank until the

bottom forming portions

4 and 4 have been fully stretched in opposite directions as illustrated by Fig. 3, in which stretching the diamond forming arms 59 function to form the corners 4 as mentioned.

After the clamps 29 have released their hold, the further rotation of the main cylinder 3 causes the blank to rest wholly on the latter as illustrated in Fig. 4.

During the formation of the bag-bottom forming elements into their arrangement illustrated by Fig. 4 the paster roll 69 has functioned to apply paste as indicated by 4 in Figs. 4 to 7 inclusive. I

Directly after the paste has been applied the second crease 4 is formed in the blank (see Figs. 5 to 7 inclusive). Such creasing operation is performed by the tucker blade 87 entering and pushing the blank into the space between the gripper-blade 89 and the bar 92*. The tucker-blade 87 is then withdrawn, and the gripper-blade 89 pinches the second crease 4 against the bar 92*. The pins 5 are retracted by the rotation of the shaft 46 in a clockwise direction shortly before the devices making said crease 4 in the blank are thrown into action. drawal of said pins 5 tends to cause forwardend of the blank to spring up at an angle from the circumference of the main cylinder, so that the roller 8 may function to fold the blank-end 4 back upon the body of the blank as illustrated by Figs. 6 and 10.

The side clamps 7 meanwhile still hold the blank firmly and immovably on the circumference of the main cylinder 3, which is essential, because if the blank were to shift on the main cylinder the bag bottom would be imperfectly made.

It is also essential that the second crease 4 of the blank be firmly held on the main cylinder 3 while the roller 8 is brought against and folds back the blank portion 4.

The With-