US2078188A - Apparatus for manufacturing, at choice, bags, pockets, double pockets, and envelopes - Google Patents

Description

April 20, 1937. wlNv ER ET AL 2,078,188 ANUFA APPARATUS FO RING, AT CHOICE, BAGS,

POCKETS, DOUBLE POCKETS, AND ENVEL S Filed April 16, 1935 Sheets-Sheet 1 llllllllum llmlll Aprll 20, 1937. A. WINKLER E-r AL T 2,078,188

APPARATUS Fon MANUFACTURING, AT CHOICE, BAGS, n

PooKETs, DOUBLE PocxETs, AND ENvELoPEs Filed April 16, 1935 5 Sheets-Sheet 2 April 20, 1937. A, WlNfLER ET AL 2,078,188

APPARATUS FOR MANUFACTURING, AT CHOICE, BAGS, POCKETS, DOUBLE POCKETS, AND ENVELOPES 3 Sheets-Sheet 3 Filed April l, 1955 Patented Apr. 20, 1937 PATENT OFFICE 2,078,188 APPARATUS FOR MANUFACTURING, ATv

CHOICE,

Alfred Winkler and BAGS, POCKETS, POCKETS, AND ENVELOPES DOUBLE Max Dnnebier, Neuwied, Germany Application April 16, 1935, Serial No. 16,724 In Germany August 16, 1933 33 claims'.

This invention relates to a rotary machine for manufacturing, at choice, bags, pockets, double pockets and envelopes. In its narrower aspect the invention has reference to a machine, for

the purpose specified and of the kind in which Aa sheet or blank which, for the time being, comes lowermost in a stack of sheets is bulged out be- .tween two oppositely rotating rolls and withdrawn from the stack while, at the same time,

the bulge in the sheet is converted into a fold.

The most important feature of the invention is to be observed in the combination comprising a device which withdraws a sheet from the stack while, at the same time, giving it one fold and immediately thereafter gives it a second and parallel fold, a roll system, immediately adjoining said device, said roll system being operative to align the work-pieces, pre-crease the same for the remaining folds and (when necessary) stick together the two flaps first formed and an endless travelling conveying means provided with grippers which latter carry the work-pieces past means operative to fold over the two flaps still remaining open and to stick down one of these flaps and finally deliver the finished Work-pieces to the output stack;

This combination, in itself, affords certain important advantages over known machines. Among such advantages may be mentioned the simplified construction of the machine and the facility afforded for supervising its several individual operating points and the progress of the work as a whole, but the most important advan tage resides in the' possibility which it affords for making up the most widely varied kinds of workpieces, such as flat bags, pockets, double (folder) pockets and envelopes` for letters in all the vay rious shapes and with all the different types of sticking that may be adopted for such articles. 40 To particularize; it is possible, owing' to the use f of the grippers arranged on the endlessconveying means, for folding over the two flaps last formed, to make' articles, for instance, envelopes of the-five-seal typ which the side flaps are very broad, extending to the middle of4 the work-piece or even farther. This is because the folding over of such aps is in nowise hindered by the grippers as it is when conveyor rolls and cylinders are used.

The advantages of the combinationaccording to the invention are greatly enhanced by novel constructions of individual devices therein. Thus, the devices now to bev enumerated also constitute subject matter of this invention:

l. A device for withdrawing the lowermost e (with triangular flaps) in sheet from the stack and producing the first two parallel folds. For this purpose there are employed two pairs of rolls which co-operate in such a manner that the sheet is first seized by an intake roll and bulged out under the rest of the stack and then nipped between the said intake roll 'and a counter roll and drawn out from beneath the stack, with simultaneous formation, of the first fold. The intake roll then holds the sheet fast, by suction, until the said sheet is engaged between it and the adjacent top roll of a second` pair of rolls. The sheet, thus engaged, is guided into apocket wherein the fold first formed in said sheet strikes against a stop, so adjusted that the after end of the sheet, still positively engaged and driven, is bulged out into the aforementioned second pair of rolls, between which the second fold is then produced. In this way it is ensured that the two folds first formed in the work-piece will be located exactly at the right distance apart, since, in contrad-istinction to the working of known devices, it is notthe temporal separation of the two foldforming operations which determines the distance apart of the two folds, but only the spatial separation of the aforesaid stop from the second pair of rolls.

Moreover, with the arrangement described, it is possible to give .a very large diameter to the intake roll and a very small diameter to its two counter rolls. Since the circumference of the intake roll determines the maximum sizeof the sheet that can be drawn in by it per revolution, its large diameter has the advantage of afford- `ing great adaptability, thatis to say, a wide difference between the largest and the smallest sizes of sheet that can be worked. The small diameter of theV rst of the counter rolls co-operatingwith the intake roll also reduces the space into which the sheet to be withdrawn has to be bulged out, so that the production of scrap at thefsheet intake is avoided. Finally,| the small diameter of the second counter roll ensures that, even `when making flat bags, stuck at the'side, so that on, of the side flaps is very narrow, this side flap will still be engaged by the intake roll and its second counter roll when the second fold is formed, whereby, even in this case the fold is formed with absolute exactitude. 2. The intake roll as such-For the purpose of engaging` the sheet it is provided with two devices which, having regard to the direction of rotation of the roll, lie one behind the other. The device that lies to the rear engages the sheet rst, bythe action' of suction or friction,

the sheet between the intake roll and its rst counter roll is ensured. 3. A rubber rail extending longitudinally at the periphery of the intake roll and serving as the l rearwardly located sheet-engaging device, aforesaid. It is first to engage the sheet and bulge it out. Special means are employed to control this rubber rail in such a way that it emerges from the peripheryof the roll, either l at every revolution o f the latter or at every .second revolution thereof, for the purpose of engaging the sheet. 'I'his device makes it possible to withdraw a sheet from the stack either at each revolution orat each second revolution of 20 the intake roll, so that, in conjunction with other measures, the .number of smaller work-pieces that can be operated upon is twice the number of work-pieces of larger size for the same number of revolutions of the machine.

25 4. A device which is used in conjunction with .the system of rolls `employed in the combination to enable adhesive, for sticking together the two first formed and partially overlapping aps, to

be applied, if need be, to the undermost of these 30 two aps. 'Ihis last named provision is absolutely-necessary, in View of the way in which the combination works. 'I'he device consists of a rotating adhesive applying rail and, located ahead of this, suction members which likewise rotate, said rail and said suction members being so controlled that the latter raise the overlying flap and the adhesive applying rail passes beneath this iiap to apply adhesive to the flap lying underneath, whereupon the said adhesive applying rail moves out again from beneath the upper ap which the suction members then release. Meanwhile a supplementary device assists in freeing the lower ap from the adhesive applying rail.

5. Means serving for longitudinal adjustment in relation to the rest of the machine of the whole arrangement for withdrawing the sheet from the stack and producing the rst two folds. This adjustability facilitates changing over the machine from one size of work-piece to another.

One embodiment of the invention is shown, by way of example, in the accompanying drawings.I In these drawingsz- Figs. 1 and 2, which are intended to be arranged in continuity, one beyond the other, in

accordance with their terminal dot and dash lines,

'show a diagrammatic longitudinal section through the apparatus as a whole. More particularly, Fig. 1 includes the fold intake device with the associated means for aligning and precreasing halt-nished work-pieces, for applying. the adhesive, for sticking the two iirst folded flaps together and for introducing the work-pieces into the rotating grippers, while in Fig. 2 is depicted the part lyingin the region of the gripper conveyor;

Fig. 3 is a vertical transverse section through p 6 is a vertical transverse section through the intake roll, showing the springing of the steel bar carrying the'rubber rail.

Fig. 7 is a side view of the device for applying the adhesive for sticking the bag work-pieces f lengthwise. Y,

Fig. 8 is a side view of a gripper and shows how it is arranged on a travelling chain, while Fig. 9 is a front view of a gripper, looked at in the direction of the arrow in Fig. 8.

The stack of sheets I rests on the stack table 3 iixed over the side cheeks 2 and is maintained in its orderly condition bythe adjustable stops, 4. Under the stack table 3 the intake roll 5, shown in the example of Fig. 1 as a combined friction and suction roll, is mounted in the-side cheeks 2 insuch a manner that its periphery protrudes through a slot in the table `3 by a small amount. The counter roll 6 for thev intake roll 5 is yieldingly pressed against the latter and is mounted in such a Way that its periphery does actually project into the slot in the table but does not protrude above the top surface of the latter. In a channel running axially in the intake roll 5 there rests a radially displaceable steel bar 1 in which is xed a rubber rail 8. 'Ihe steel bar 'I is pressed towards the middle point of the .intake roll 5 by springs 9 .(see Fig. 6). On the shaft I0,.journalled in the end walls of the intake roll I5 are xed two levers II (see Fig. 5), the free ends of which bear upwardly from underneath against the steel bar l.l Moreover, the shaftll) also carries a bowl lever I2, the bowl I3 of which runs on the cam disc I4. This latter is mounted loosely on the shaft 5' of the intake roll and it consists of two discs of like profile which can be relatively displaced in such a manner that the raised stretch along the periphery of the .cam may have either the minimum extent shown by the full lines or'twicethat length as shown completed by the dotted line. The two parts of the cam disc I4 are secured in their relative positions by means of the screws I5. The spur wheel I6 is ixedly attached by means of screws I'I to the under part of the cam disc I4 as seen in Fig. 5. An idler spur wheel I8 is engaged with the spur wheel I6 and is driven by the spur wheel Ill-which, in turn, is driven from a suitable point in the machine, in the direction of the arrow and in such a way that it makes the same number of revolutions as the intake roll 5. The spur wheel -I6 has double as many teeth as the spur wheel I9. Accordingly it is apparent that half the number of revolutions vof the intake roll 5 can be transmitted to the spur wheel I6 and thus to the cam disc I4 the motion being in the direction of the arrow I4', which is also the direction of rotation of the said intake roll. The idler spur wheel I8 can be swung about the shaft 20 of the spur wheel I9 and so brought out of engagement with the spur wheel I6 and it can be locked in this swung out position by known means (not shown). Furthermore, the cam disc I4 can be locked by the arresting device 2l when the spur wheels I6 and 'I8 are not in engagement. If the cam disc I4 be locked by the arresting device 2|, then at each revolution of the intake roll, the steel bar I carrying the rubber rail 8 is temporarily moved outward once in opposition'to the action of the springs 9 (Fig. 6) and in accordance with the raised path on the periphery of the cam disc I `4, in such a way that the rubber `rail 8 emerges somewhat above the peripheral surface* of the roll. If, on the contrary, the cam disc I4 be freed by the arresting device 2| and if the spur CII .2, these rails being justable by l direction of the side cheeks wheels I6 and I8 be brought into engagement with each other, the movement of the steel bar 1 with the rubber rail 8 still takes place at the samepoint in its path of revolution but only at every second revolution of the intake roll 5, since, ln the same time, the cam disc |4 makes one revolution in the same direction as the roll 5. In the latter case, in order that the emergence of the rubber rail 8 above the peripheral surface of the roll may not, in consequence of the cam disc I4 turning with the roll but half as fast, be allowed to last longer, the two parts of the cam disc are so adjusted relatively to one another that the raised stretch of the cam is only half as long as when the cam disc is at rest.

The intake roll 5 has, in advance of the rubber rail 8, Vhaving regard to the direction of rotation of said roll, an axially directed suction duct 22, which is connected to a vacuum control device, of known kind, by way of a longitudinal bore 23 (Fig. 4) in the roll shaft 5 and a xed attachment 26 having a pipe coupling 24 for a pipe or hose connection 25, the vacuum control device being connected to a vacuum air pumpv and i neither of these two last named members being shown in the drawings. From the suction duct 22 suction openings the peripheral surface of the roll.

In Fig. 3 is shown a constructional form of the intake roll 5 in which, instead of the controllable rubber rail 8 a second axial row of suction openings 28 is provided, opening into a separate suction duct 29 and at the peripheral surface of the roll. In this construction the roll shaft 5' has a longitudinal bore 23, as shown in Fig. 4, at each end, these longitudinal bores each leading by way of a xed attachmentto a separate vacuum control device and thence tothe air pump.

With the intake roll 5 there co-operates a second counter roll 30 which, at the same time, constitutes the top roll for a roll 3|. On the crossbar 32 xed to the side cheeks 2 are arranged a plurality of curved guides 33, side by side,"which extend around the intake roll 5, between the counter rolls 6 and 3U, leaving a small free space `or gap. l

Below the intake roll 5, running off tangentially thereto and on an incline, a superimposed pair of rack-like guide rails and 35 are attached to flat iron bars 34 xed between` the side cheeks separated from each other sufficiently for a workpiece to be able to run in between them comfortably. A stop rail 31, ad-

means of a screw 36, extends into the gap between the guide rails 35, 35', so that a work-piece running in between the latter strikes against the stop rail 31 and is prevented from running any further. The guide rails 35, 35', together with the stop rail 31 form a. so-called impact `folder pocket.

All the parts described so far belong to the fold 'intake device and are connected, directly-or indirectly, with the side cheeks 2. These latter are horizontally adjustable in the longitudinal 38 of the rest of the machine. For their adjustment there is provided a shaft 39, which is journalled in them and on which are fixed two spur wheels 40 each'of which engages 'in a toothed rack 4|, these racks being fitted each to one of the side cheeks 38, so that rotating the shaft 39 results in shifting the side cheeks 2 in one direction or the other. Known devices (not shown) are used for locking the side cheeks 2.4

The two rolls 30 and 3| form the first pair of vgroove in 21 extend in an axial row to' to be able to emerge again top ap. In order ,to permit of this, the top roll thereof which rolls "in a horizontal roll track comprising the pairs of rolls 42, 43; 44, 45; 46,` 41; 48, 49; 50, 5| and 52, 53. The individual rolls are formed in various'different ways according to the functions assigned to them in the treatment of the work-pieces. The pair of rolls 30, 3| takes over the work-piece which is in the impact folder pocket, consisting of the parts 35., 35", 36 and 31 and forms a second fold. The roll 3| is formed as a suction roll, but the purpose of making it so is of no importance so far as the present invention is concerned. The work-piecenow comes between the pair of rolls 42,'43, of which the roll 42 has two sheet steel rails 54, projecting slightly above its peripheral surface and as this roll rotates these rails encounter a ,longitudinal the counter roll 43 the diameter of which is half the size of that of the roll 42. As will be explained later, the sheet steel rails 54 serve for aligning the work-pieces.

in this roll track The, followveyor rolls, as also are the pairs of rolls 48, 49 and 52, 53. The pair of rolls 46, 41 takes care of the pre-creasing of the work-piece for the succeeding folding operations. The bottom roll 41 has a rubber coating 56, into which the breaker knives or pre-folder blades ,51 and 58 on the roll 46 press lightly. The pre-folder blades 51 and 58 are fixed to individual longitudinally adjustable parts of which the roll 46 is built up. The folds running in the direction in which the work-piece is being vconveyed are pre-creasedby the lcircular plate-like blades 51 while those which run at right angles to' that direction are pre-creased by the axially arranged blade 58. The further explained hereinafter is used only in the production of certain kinds of work-pieces.

' i `After the work-piece has run through the pair of rolls 48, 49 the adhesive for the longitudinal sticking of iiat bags is applied between the pair of rolls 58, 5|. Since that flap of the bag which lies underneath-and to the rear, having regard to the direction of travel of the work-pieces has to receive the adhesive, it becomes necessary for the adhesive applying rail by means of which the adhesive is applied to be brought underneath the already turned up top'flap, which lies advanced in the direction of travel and, likewise, for it from beneath the said 50 is constructed in the following manner:-V

The actual conveying of the work-piece is effected by two discs adjustable longitudinally of the roll shaft 59, these discs being provided with diametrically opposed lugs or projections 6| directed towards the middle of the roll. Only these lugs 6| come into contact with the workpiece for the purpose of causing the same to` travel. They only engage the lower and rearwardly lying flap W at those opposite ends lie transversely of the direction of travel and this they do outside the region of the turned up top flap W. As regards the said flaps` of the work-piece, attention is directed to Fig. '1in which, however, for the sake of clearness, the `discs 60 with the lugs 6| are not shown. On the roll shaft 59 double-armed members 63 are fixed by means of screws 62, these members carrying the adhesive applying rails 64, both of which can be seen in Fig. l, while in Fig.'7 only one is shown. In addition, a plurality of doublearmed members are lxedly arranged on the roll shaft 59, each arm of these being formed as a suction member and', to this end, provided with bores 66, these bores presenting suction openings blade 58 as is at the outer ends of the arms while in the interior,`they are connected with longitudinal bores 61 in the roll shaft 59, serving 'as suction ducts. These separate longitudinall bores 61, like those in the roll shaft 5' are connected each by way of a vacuum control device, to a vacuum air pump. Finally, a toothed segment 68 is fixed by means of a screw 69 to the roll shaft 59.

A spur wheel 10, driven from any suitable point in the machine is used to drive the roll shaft 59.

The spur wheel 10, however, is not made fast onthe roll shaft 59, but is loosely mtatable thereon and is coupled thereto solely by a toothed segment 1|. 'I'his toothed segment 1| is rotatable about a stud 1| screwed into the spur wheel 10 and segment 68 mounted on the roll shaft 59. Accordingly, the roll shaft 59 is entrained by the -spurwheel 10 through the intermediary of the two toothed segments 68 and 1| and if Vthe toothed segment 1| be partially rotated about thestud 1|', the roll shaft 59 executes a corresponding movement and so becomes displaced relatively to the driving wheel 10. The bowl arm, the bowl 14 yby a spring 13. Consequently, when the driving wheel 10 is rotating, so long as the toothed segment 1| is not swung out of place the roll shaft 59 revolves with the same angular velocity as thedriving wheel 10, so that the outer ends of the adhesive rails 64 and the suction members have a peripheral velocity which agrees exactly with the velocity of travel of the work- Simultaneously with the inception `of its increased peripheral velocity or immediately therebefore, the operative suction members 65, under jacent flap W" and apply adhesive to the latter. If now, after the adhesive has been applied and the adhesive rail 64 has freed itself from the work-piece W, retardation of the peripheral velocity of the said adhesive rail 64 and of the suction members 65 sets in and if, at the same time, the suction effect in the said suction members' be terminated, the adhesive rail 64 will again emerge from underneath the upper nap W' and this latter will lie down again on top of the lower flap W".

To assist and accelerate disengagement of the adhesive rail 64 from the work-piece, a plurality of sheet metal naps 15 are pivoted on two diametrically opposite shafts 16 so as to be movable in the longitudinal direction thereof. In Fig. 7 only one of these is 16 `Upon this the grippers 83 nite and inter se equal distances. The chain 84 quently, partake in the transitory increase and decrease in its peripheral velocity. Upon the shaft 16 is also xed a bowl lever, the bowl of which is pressed by a spring 11 against a xed cam disc 18, only indicated in Fig. 7, the eiect ofA this cam disc being to swing the sheet metal aps 15, at a given moment, out of the position shown in full lines and into that shown in dotted lines,so that they press the lower flap W" of the work-piece away from the adhesive rail 84. The adhesive rails 64 are fed from the adhesive container through the intermediary of the dipper roll 8| and the applier roll` 82.

The pair of rolls 52, 53,y being the last pair of the roll track, is adapted to pass thework grippers 83 of one or more chains 84. In-the drawings one such chain is shown.

are fastened at defiruns over'the chain wheels 85, 86, 81 (see also Fig. 2). Each of the grippers 83 is so fitted into the chain that the bottom or basic member 88 thereof (Fig. 8) at the same time forms an outer member of the chain. 'I'he top surface at the front part of the basic member serves as the spring 9|, forming is fixed by means end it rests in a seat inthe basic member 88. By shifting the slide-like member 90 to the rear, that is to say, in the direction of travel of the workpieces, the leaf spring 9| is also moved back and, at the same time, is opened by the throw of the small lever 93.

'Ihe opening and closing of the grippers 83, that is to say, the movement of its slide-like part 90, is effected by means of separately controlled, double-armed levers 94, rotatably mounted on pins on the chain wheels 85 and 81. One arm of each lever 94 is formed a; a tooth 96 which, at a given time, runs into a gap or notch 91 in the slide-like member 90. .The other arm ofthe lever 94 carries a bowl 98 which runs round on a fixed cam disc 99 and thereby oscillates the lever 94, so that the tooth 96 of the latter sets the slide 90 in motion, to one side or the other, for opening or closing the gripper.

On both sides of the gripper chain 84, along its path from chain wheel 85 to chain wheel 86 are ixed guide plates or rails |00, at the level of the top surface of the lower jaw oi the gripper, the work-pieces engaged by the grippers being supported by these plates.

Within the conveyor path traversed by the gripper chain 84 the following devices for the further treatment of the work-pieces are provided: 1

1. The folder blades |0|, of degrees and which turn over on to the body of the work-piece the iiaps Lying in the direction of travel of said work-piece.

2. 'Ihe bottom roll |02 with the roll |03 running freely thereon, to press down the folds of the last named naps.

3. The unfolder guides |04; these are suitably formed rails which engage between the turned over naps and the body ot the work-pieces, and open theaps again when these aps have to be subsequently gummed or have to remain open .in the finished work-piece.

4. A device for applying the adhesive for sticking the bottom fla this device consisting of rotary adhesive rails |05, which receive the adhesive from the container |06 by way of thel dipper roll |01 and the applier roll |08.

5. A second folder blade |09, which i's shaped like the first folder blade and effects the final folding over of the bottom flap.

6. The bottom roll I0 withthe roll running freely thereon, to press down and stick the bottom flap. j

'1. The stacking table I2, upon which the nished work-pieces are stacked, one against an'- other, in upright position.

' The manner in which the whole device works is as follows: f

The intake roll 5 of Fig. 1 is, as can be seen from the foregoing description, a' combined friction and suction roll. Its controllable rubber rails 8 exert a rubbing action on the lowermost sheet of the stack of sheets so that they rst of all bulge out this lowermost sheet underneath the rest of the stack; only when this has happened does the series of suction openings 21 come into contact with the sheet. In this way'the sheet is first bulged out by the rubber rail- 8 into the gap formed between the. rolls 5 and 6. The suction effect then set up by the suction openings 21 maintains and completes the bulging in such .a way that the sheet is certain to be gripped between the rolls 5 and l5` and a fold formed in it. In contradi'stinction to other known suction folding devices the suction remains effective even when the fold has been produced and has run outI tween the rolls 5 and 30.

The action is the same even with the intake roll 5 according to Fig. 3. The difference consists solely in this; that the sheet, in this case, is initially bulged out by the suction openings 28 instead of by rubber rails and is then seized by suction openings 21, as before.

Under the action of the rolls 5 and 30 the work-piece is fed bodily into the impact folder pocket, made up of the lguide racks 35 and 35' and the stop rail 31, until the edge of the fold previously formedvbetween the r'olls 5 and B Vstrikes against the said rail 31, which is adjusted according to the size of the work-piece being operated upon. mlivery of the rear or trailing part of the work-piece through the nip of the rolls 5 and 30 still continues after the'edge'of the fold in the forward or leadingpart has been arrested by the rail 31; consequently the work-piece is buiged out and the bulge forcibly driven in between the pair of rolls 30, 3|, which thereupon form the second fold.

The rolls 30, 3| deliver the work-piece to the pair of rolls 42, 43, which is so adjusted that the leading edge of each work-piece encounters one of the sheet steel rails in the roll 42 when such rail is in the groove or channel 55 in the roll 43; thus, at first, the work-piece is not gripped by the rolls 42 and 43 although it is still being ldelivered by the Vrolls 30 and 3|. As a result, it buckles to some extent, since it is held back at its forward folded edge by the sheet steel rail 54.- In this condition it is then ultimately gripped between the rear edge of the groove 55 in the roll 43 (having regard to the direction of rotation of the latter) and the roll 42. In this manner the work-piece is exactly located both temporally and spatially to come into the path of'operation of the succeeding tools, so that these take effect on the right parts of the work-piece.

The work-piece running out from the pair of rolls 42, 43 is seized by the pair of conveyor rolls 44, 45 and conducted to the pre-creaser rolls 46, 41 the construction of which has been hereinbefore described. '.Ihe circularplate-like blades 51 are used both in the production of bags and in the making of envelopes. 'Ihey are adjustable to correspond to the width of the work-piece as measured at right angles to the direction of travel. On the other hand, the blade 58, running axially of the roll 46 cornes into use only in the production `oi" double pockets for phot( graphs and similar work-pieces, which have to be given a. preliminary crease or fold, running at right angles to their direction of travel, in the middle, between their two connected pockets.

lImmediately afterwards the work-piece runs through the pair of rolls 48, 49 which deliver it to the device which applies the adhesive to the lowermost of the two aps. This consistsv of the bottom roll 5| and the several devices arranged on the shaft 59 and has already been described herein, as regards its construction and manner of working. operation only in the production of bags stuck at the sides or in the middle and for envelopes This devices comes into with high closure gumming, in which there arises the problem of putting the coating of gum, underneath the flap that lies uppermost, on to the subjacent flap in a work-piece which is already completelyl folded over along longitudinal folds lying at right angles to the direction of travel.

From the pair of rolls 50, 5|, comprising the adhesive applying device, the work-piece comes in between the pair of conveyor rolls 52, 53 which deliver it-up to the grippers 83 of the chain 84. Oscillating sheet metal iiaps I3 which come down on to the work-piece at a given moment, ensure I the said work-piece lying fiat down on the bottom jaw of the gripper receiving it, immediately before being gripped by such gripper. The grippers 83 convey the work-pieces, now half finished and already pre-creased at the flaps still tov beturned over, through the fold over zone, comprising the folder blades |0|. Here the bottom and closure flaps lare turned over `on to the body of the work-piece and sharply folded by the roll |03 running on the bottom roll |02.

Of the now ready folded bottom and closure flaps, the bottom flap in every case but the closure flap only if it is to remain open in the finished work-piece, is opened again by the unfolder guides |04, and the adhesive for sticking the bottom flap is applied by the rotary adhesive rails |05. The second folder blade |09 then again turns over the bottom fiap and the roll I, running on the bottom roll 1| 0, presses the bottom flap firmly on to the body of the work-piece. The now completely finished work-piece is then brought by its gripper 83 on to the stacking table ||2 of the collecting device, the grippers 83 letting go at the moment when the leading edge of the workpiece reaches the stacking table I2. In this way, during the operation of the device, the workpieces range themselves one against another on the stacking table H2, so that a stack of upstanding finished work-pieces is obtained.

The whole of the fold intake device, including the pair of rolls 30, 3| and together with the table 3 supporting the input stack I and the impact.

folder pocket 34, 35, 35', 31 is dsplaceable in the ,longitudinal direction of the apparatus as a whole,

the rolls 42 and 46, as also or' the r'oll 50 and the rotary adhesive applying rails |05. When, however, the work-pieces exceed a certain size, measured in the directionof travel (and this applies. in practice, to all commercial sizes of double pockets), the device must be so readjusted that for each revolution of the machine only one workpiece is finished. To this end the following measures must be adopted:

1. Since the intake roll 5, in contradistinction to the ions 42, as, so and the adhesive rails los, exea cutes two revolutions iii Jone revolution of the vmachine and, consequently must withdraw a sheet from the stack at each revolution when producing the smaller work-pieces but only at every second revolution when producing thelarger ones, the bi-partite cam disc I4 (Fig. 5), which controls the rubber rail 8 mounted in the intake roll 5 must be adjusted so that the extent of its raised peripheral zone is a minimum (according to the full lines in Fig. 5), the cam disc must be released from the locking device 2l and the spur wheel 'i8 must be brought into engagement with the spur wheel l 6 so that the intake roll 5 only withdraws a sheet from the stack at every second revolution. x

1a. If an intake roll according to Fig. 3 be employed the vacuum control device must be re-set,

in a manner which may be assumed to be known, so that the vacuum comes into action in the ducts 22 and 29 and in the suction openings 21 and 2B only at every second revolution of the roll.

2. One of the two aligning rails 54 fitted in the roll 42 is removed.

3. From the device incorporating the roll 50 one of the adhesive rails 64 isremoved and the vacuum duct to those arms of the member B5 which lie adjacent to the adhesive rails 64 thus removed is shut on, the corresponding loosening aps 15 being likewise put out of action. I

4. Half of the grippers 83 ilxed on the chain 84 are put out of action, so that between every two operative grippers there remains an inoperative one. The cutting out of the grippers, however, is not eii'ected by taking the whole gripper out of the chain assembly but by drawing out and removing the slide-like part 90 to which is attached the leaf spring 9| serving as-the upper jaw.

What we claim isz- Y I 1. In a machine for-*producing bags, pockets, double pockets and envelopes, means for extracting individual work-pieces from a stack of workpieces carried in the machine and forming two initial parallel folds in each extracted work-.

piece, said means comprising a pair of intake rolls, one of which, constituted as a suction roll, is adapted to draw a work-piece from the stack into the nip of the intake rolls with ,simultaneous formation of the first fold, a second pair of rolls, one of which co-operates with the intake suction roll to withdraw the work-pieces from the nip of the intake vrolls and a fold receiving pocket positioned to arrest the first fold ohthe workpiece while the latter is still in process of being fed Abetween the two co-operating yrolls of the 'rst and second pairs, said second pair of rolls being adapted to nip the bight thus formed in the work-piece and to extract the work-piece fromthe fold receiving pocket, with simultaneous i formation of the second fold.

2. The device of claim l, characterized by the fold receiving pocket including 'adjustable means adapted to determine the position of arrest of the first fold of the work-piece according to'the size of the latter and the required distance of separation between' the iirst and second folds.

3. Ina machine flor producing bags, pockets, double pockets and envelopes, means for extracting individual work-pieces from a stack of work operates with the intake suction roll to withdraw the work-piece from the nip of the intake rolls and a fold receiving pocket positioned to arrest the iirst fold of the work-piece while the latter is still yin process of being fed between the two cooperating rolls of the rst and second pairs, said second pair of rolls being adapted to nlp the second bight thus formed in the work-piece and to extract the work-piece from the fold receiving Docket, with simultaneous formation of ythe second fold.

` 4. In a machine for producing bags, pockets, double pockets and envelopes, means for extracting individual work-pieces from a stack of workpieces carried in the7 machine and forming two initial parallel folds in each extracted Work-piece.

said means comprising a pair of intake rolls, one of said rolls including means adapted frictionally to engage each work-piece and to form abight there across prior tothe extraction of such workpiece Afrom the stack and suction means organized to draw such bight into and through the nip of the intake rolls withsimultaneous formation of the ir'st'fold, a second pair of rolls one of which cooperates with the intake roll including the frictional and suction means, to withdraw the work-piece from the nip of the intake rolls and a fold receiving pocket positioned to arrest the rst fold of the work-piece while the latter is still in process of being fed between the two cooperating rolls of the first and second pairs, said second pair of rolls being adapted to nip the second bight thus formed in the work-piece and to y extract the work-piece from-the fold receiving Docket, with simultaneouscformation of the second fold.

5. AIn a machine for producing bags, pockets,

. double pockets and envelopes, means for extract- Ving individual work-pieces from a stack of workpieces carried in the machine and forming two initial parallel folds in each extracted work-piece.,

said means comprising a pair of intake rolls, one of saiderolls including suction means organized to engage each work-piece and to form a bight there across prior to the extraction of such worka fold receiving pocket ,positioned to arrest the first fold of the work-piece while the latter is still in process of being fed between the two cooperating rolls of the first and second pairs, said second pair of rolls being adapted to nip the 5 second bight thus formed in thev work-piece and to extract the work-piece from the fold receiving pocket, with simultaneous formation of the second fold.

6. In a machine for producing bags, pockets, double pockets and envelopes in a variety of sizes the combination with an assembly including means for holding a plurality of work-pieces in a stack and means for withdrawing work-pieces from the stack forming two initial longitudinal 5 parallel folds in each work-piece so withdrawn and ej'ecting the work-piece so folded, and a second assembly including means for receiving the initially folded work-piece ejected by the first assembly and meansfor producing transverse 0 folds in such work-piece of means for varying the spatial separation between said first men.- tioned and said second mentioned assemblies.

'7. In a machine for producing bags, pockets, double pockets and envelopes in a variety of sizes 5 the combination with an assembly including means for holding .a plurality of work-pieces in a stack and means for withdrawing work-pieces from the stack forming two initial longitudinal parallel folds in each work-piece so withdrawn 0A and ejecting the work-piece so folded, and a second assembly including means for receiving and aligning the initially folded work-piece ejected by the first assembly and means for producing transverse foldsin such work-piece of means for :2.) varying the spatial separation between said rst mentioned assembly and the receiving and aligning means ofthe second mentioned assembly.

8. In a machine for folding and sticking workpieces .to produce bags, pockets, double pockets and envelopes, means for supporting a stack of work-pieces, a pair of intake rolls positioned in proximity to said stack and including means for drawing a work-piece therefrom into their nip with simultaneous formation of a first fold in such work-piece, a pocket structur positioned tangentially to the periphery of one of said i'ntake rolls, and means for guiding the work-piece from the nip of said intake rolls into said pocket structure, the latter including an adjustable ar-V resting abutment for said first fold in said workpiece, a second pair of rolls having their nip located opposite the mouth of said pocket structure said second pair of rolls adapted to withdraw i said work-piece from said pocket structure with simultaneous formation of a second fold in said work-piece parallel to said first fold, one of said second pair of rolls coacting with one of said intake rolls to maintain feed of said work-piece into the nip of said second pair of rolls during arrest of said first fold by the abutment of said pocket structure, means for producing in the work-piece opposing folds transverse to said first and second folds, means for sticking together -flaps resulting. from the folding of the work-piece, means for receiving finished work-pieces and means for conveying work-pieces from the nip of the second mentioned pair of rolls past the said transverse fold producing means and the said flap sticking means to said finished work-piece receiving means.

in a machine for folding and sticking workpieccr.; if; produce bags. pockets, double pockets and envelopes, means for supporting a stack of work-pieces, a4 pair of intake rolls positioned in proximity to said stack and including means for drawing a Vwork-piece therefrom into their nip with simultaneous formation of a first fold in such work-piece, a pocket structure positioned tangentially to the periphery of one of said intake rolls, and means for guiding the work-piece from the nip of said intake rolls into said pocket structure, the latter including an adjustable arresting abutment for said first fold in said work-piece, a second pair of rolls having their nip-located opposite the mouth of said pocket structure, said second pair of rolls adapted to withdraw said work= piece from said pocket structure'with simultaneous formation of a second fold in said work-piece parallel to said first fold, one of said second pair of rollscoacting with one of said intake rolls to maintain feed of said work-piece into the nip of said second pair of rolls during arrest of said first fold by the abutment of said pocket structure, a roll track conveyor adapted to withdraw the workpiece from the nip of said second mentioned pair of rolls, an endless conveyor including means for gripping individual work-pieces emerging from the roll track conveyor, means associated with the endless conveyor for producing in the work-piece gripped thereon folds transverse to the said first and second folds, means for sticking together predetermined iiaps of the work-piece produced by the folding thereof and means for receiving finished work-pieces, said endless conveyor further including means for causing the work-pieces to be engaged' by its gripping means when delivered from the roll track and disengaged from such gripping means; upon arrival at the finished work-piece receiving means.

10. A machine according to claim 9, wherein one roll of the first pair of rolls of the roll track conveyor carries axially directed radially proJecting aligning means for the second fold of the work-piece, the other roll of said pair being recessed to accommodate said aligning means dursaid folds.

13. A machine according to claim 9, wherein the roll track conveyor includes a pair of co-acting rolls incorporating means for sticking together overlapping flaps when produced by the forming of the first and second folds in the workpiece.

piece from the stack into their nip and there to produce the fold, said suction roll including vacuum means for engaging the work-piece, an axially extending, radially displaceable friction rail adapted for transitory engagement with the work-,piece to form therein a bight for subsequent engagement by said vacuum means and means tending to4 maintain said friction rail within the confines of the suction roll periphery, meas for rotating said suction roll and means operative periodically during rotation of said suction roll to protrude said friction rail from its periphery into contact with the Work-'piece to be engaged.

15. In a mechanism for the automatic production of a fold in an initially fiat work-piece, means for supporting a stack of work-pieces, a suction roll and counter roll organized to draw awrkpiece from the stack into their nip and/there t produce the fold, said suction roll'includin'g vacuum means forengaging the work-piece, 'an axially'extending, radially displaceable friction rail adapted for transitory engagement with the workpiece to form therein a bight for subsequent engagement by said vacuum means and means tending to maintain said friction rail within the confines of the suction roll periphery, means for rotating said suction roll, cam means operatively associated with said suction roll and friction rail to protrude said friction rail periodically from.

the rotating roll periphery into contact with the work-piece and means for varying the number of revolutions executed by the suction roll between successive actuations ofsaid friction rail by said cam. means.

16. In a mechanism for the automatic production of a fold in an initially at work-piece, means for supporting a stack of work-pieces, a suction roll and counter roll organized to draw a workpiece from the stack into their nip and there to produce the fold, a suction roll including vacuum means for engaging the work-piece, an axially extending, adapted for transitory engagement -with the work-piece to form therein a bight for subsequent engagement by said vacuum means and means tending to maintain said vfriction rail within the connes of the suction roll periphery, means for rotating said suction roll, a cam mounted coaxially with said lsuctionroll and having an -0perative portion adapted to act on said friction rail to protrude the same from the rotating roll periphery into contact with the work-piece, releasable means for holding said cam stationary during rotation of the suction roll, so as to cause actuation of said friction rail once in every revolution of said suction roll and means operable when said cam holding means is released to rotate'said lcam in the same direction as the suction roll but at a speed such as to cause the suction roll to execute a plurality of revolutions between successive actuations of the friction rail.

17. The device according to claim 16, characterized by means for varying the period of dwell of the cam relatively to the friction rail.

18. In a'machine for folding and sticking workpieces toV produce bags, pockets, double pockets and envelopes, the combination with means for supporting a stack of work-pieces and means for extracting work-pieces one by one from the stack and forming substantially simultaneously, the first longitudinal fold in the extracted work-piece, of mea-ns for feeding the work-piece folded edge foremost, means for receiving and arresting the folded part of the work-piece under maintainedfeed of the opposing non-folded part and initiation of the second longitudinal fold therein by the same feed means, means for withdrawing the work-piece from said receiving and arresting means with simultaneous completion of the said 'second longitudinal fold, means for receiving finished work-pieces, means for transporting workpieces from the means which forms the second longitudinal fold to the finished work-piece receiving means and, operatively associated with saidwork-piece transporting means, means for producing transverse folds in said work-piece and transverse flap sticking means.

19. In a machine for folding and sticking workradially displaceable friction rail pieces to produce bags, pockets, double pockets and envelopes, the combination with means for supporting a stack of work-pieces and means for extracting work-pieces one by one from the stack and forming, substantially simultaneously, the rst longitudinal fold in the extracted workpiece, of means for feeding the work-piece folded edge foremost, means for receiving and arresting the folded part of the work-piece under maintained feed of the opposing non-folded part and initiation of the second longitudinal fold therein by the same feed means, means for withdrawing the work-piece from said receiving and arresting means with simultaneous completion of the said second longitudinalA fold, means for receiv Y ing nished work-pieces, means'for transporting work-pieces from the means which forms the Second longitudinal fold to the finished workpiece receiving means and, operatively associated with said work-piece transporting means, means adapted to pre-crease work-pieces for transverse folding, means for producing transverse folds in said work-piece and transverse flap' sticking means.

20. In a machine forifolding and sticking workpieces to produce bags, pockets, double pockets and envelopes, thecombination With means for supporting a stack of work-pieces and means for extracting work-pieces one by one from the stack and forming, substantially simultaneously, the first longitudinal fold in the extracted workpiece, of means for feeding the work-piece folded edge foremost, means for receiving-and, arresting thefolded part of the work-'piece under maintained feed of the opposing non-folded part and initiation'of the second longitudinal fold therein by the same feed me'ans, means for withdrawing the work-piece from said receiving and arresting means with simultaneous completion of the said second longitudinal fold, means for receiving finished work-pieces, means for transporting work-pieces from the means which forms the second longitudinal fold to the finished Workpiece receiving means and, operatively associated with said work-piece transporting means, means adapted to pre-crease work-pieces for transverse folding, said last named means being modifiable when making double pockets and like folders to produce in the work-piece, in addition to the transverse creases, a longitudinal crease supplementary to and intermediate between the first and second longitudinal folds, means for producing transverse folds in said work-piece and transverse ap sticking means.

21. In a machine for folding and sticking work-pieces to produce bags, pockets, double pockets and envelopes, the combination with means for supporting a stack of work-pieces and means for extracting work-pieces one by one from the stack and forming, substantially simultaneously, the first longitudinal fold in the extracted work-piece, of means for feeding the work-piece folded edge foremost, means for receiving and arresting the folded part of the workpiece under maintained feed of the opposing non-folded part and initiation of the second 1ongitudinal fold therein by the same feed means, means for withdrawing the work-piece from said receiving and arresting means with simultaneous completion of the said second longitudinal fold, means for receiving finished work-pieces, means for transporting work-pieces from the means which forms the second longitudinal fold to the finished work-piece receiving means and, operatively associated with'said work-piece trans- 75 porting meansfmeans adaptable, when producing bag-like articles, for introducing adhesive between already contacting overlapping longitudinal fiaps and sticking said flaps together, means for producing transverse folds in said work-piece andtransverse flap sticking means.

22. In a machine for folding and sticking work-pieces to produce bags, pockets, double pockets and envelopes, the combination with means for supporting a stack of work-pieces and means for extracting work-pieces one by one from the stack and forming, substantially simultaneously, the first longitudinal fold in the extracted Work-piece, of means for feeding the work-pieces folded edge foremost, means for receiving and arresting' the folded part of the Work-piece under maintained feed vof the opposing non-folded part and initiation of the second longitudinal fold therein by the same feed means, means for withdrawing'the workpiece from said receiving and arresting means with simultaneous completion of the said second longitudinal fold, means for receiving iinished work-pieces, means for transporting workpieces from the means which forms the second longitudinal fold to the finished work-piece receiving means and, operatively associated with said Work-piece transporting means, means adapted to pre-crease work-pieces for transverse folding, means adaptable, when producing baglike articles, for introducing adhesive between already contacting overlapping longitudinal flaps and sticking said flaps together, 4means for producing transverse folds in said work-piece and transverse flap sticking means.

23. In a machine for Vfolding and sticking workpieces to producebags, pockets, double pockets and envelopes, the combination with means for supporting a stack of work-pieces and means for extracting work-pieces one by one from the stack and forming, substantially simultaneously, the rst longitudinal fold in the extracted workpiece, of means for feeding the work-piece folded edge foremost, means for receiving and arresting the folded part of the work-piece under maintained feed of the opposing non-folded part and initiation of the second longitudinal fold therein by the same feed means, `means for withdrawing the work-piece from said receiving and arresting means with simultaneous completion of the said second longitudinal fold, means for receiving finished work-pieces, means for transporting,l

work-pieces from the means which forms the second longitudinal fold to the finished workpiece receiving means and, operatively associated with said work-piece transporting means, means 'adapted to pre-crease work-pieces for transverse folding and adaptable to produce in double pocket Work-pieces a longitudinal crease intermediate the first and second longitudinal folds, means adaptable, when producing. bag-like articles, for introducing adhesive between already contacting overlapping longitudinal flaps and sticking said flaps together, means for producing transverse folds in said work-piece and transverse flap sticking means.

24. The machine according to claim 18, characterized by the workpiece transporting means including feed means operative temporarily, before feeding, to arrest progress of the leading folded edge of the work-piece directly upon its emergence from the means completing ,the second longitudinal fold and thereby to align said Workpiece prior to initiation of the transverseA folds.

25. In a machine for folding and sticking workpieces to produce bags, pockets, double pockets and envelopes, the combination comprising means for supporting a stack of work-pieces, means for extracting work-pieces, one by onef from the stack with substantially simultaneous formation of the rst'longitudinal fold in the extracted work-piece, means forfeeding the work-piece, folded edge foremost, means for receiving and arresting the folded part of the work-piece under maintained positive feed of its non-folded part and initiation of the second longitudinal fold@ therein by the same feed means, means for withdrawing the work-piece from said receiving and arresting means with simultaneous completion of the said second longitudinal fold, rotary means adapted to feed the work-piece in a direction at right angles to the longitudinal folds, said rotary means embodying means for aligning the work-piece means for pre-creasing the work-piece Y for supporting la stack of work-pieces, means for extracting work-pieces, one by one from the stack with substantially simultaneous formation of the first longitudinal fold in the extracted work-piece. means for feeding the work-piece, foldededge foremost, means for receiving and arresting the lfolded part of the work-piece under maintained positive feed of itsnon-folded part and initiation of the second longitudinal fold therein by the same feed means, means for withdrawing the work-piece from said receiving and arresting means with simultaneous completion of the said second longitudinal fold, rotary means adapted to feed the work-piece in a direction at right angles to the longitudinal folds, said rotary means embodying means for aligning the Work-piece means for pre-creasing the work-piece at the predetermined locations for transverse folding, means operable when producing double pockets and like fodlers to form a longitudinal crease at a predetermined location intermediate between the already existing longitudinal folds and means operable when producing bag-like articles to stick together already overlapping longitudinal naps,

endless conveyor means arranged to receive workpieces from the aforesaid rotary means, said end= less conveyor means being associated with means for folding the transverse aps and means for sticking down said transverse flaps, and means adapted to receive finished work-pieces from said endless conveyor means.

27. In amachine for folding and sticking work- Apieces' to produce bags, pockets, double pockets tion of a first ylongitudinal fold, meansfor immediate subsequent formation of a second longitudinal fold, rotary means adapted to receive the longitudinally folded work-pieces from the means producing the secondlongitudinal fold and to impart to said work-pieces a translatory movement in a direction transverse to their longitransverse folding, endless' conveyor means.adapt. ed to receive the prepared work-pieces from said rotary means, transverse folder means and trans- 5 verse flap sticking means associated with said endless conveyor means and means for receiving finished Work-pieces from said endless conveyor means, said .rotarymeans including means for ,l

sticking together overlapping flaps produced in Work-pieces for bags and bag-type envelopes by the initial longitudinal folding of such workpieces.

28. In a machine for folding and sticking work- A dinal folds while preparing said work-pieces for ,Y transverse folding, endless ,conveyor means adapted to receive the prepared work-pieces from said rotary means, transverse folder means ands `transverse flap sticking means associated with 3.0 said endless conveyor means and means for rekceiving finished work-pieces from said endless -conveyor means, said rotary means including means for vtemporarily separating overlapping flaps produced in work-pieces for bags and bag- 5 type envelopesjby the initial longitudinal folding o f such work-pieces, means for coating adhesive on to the surfaces of the lower longitudinal flaps exposed by the temporary separation of the upper longitudinal naps therefrom and means for bring- 4,0l ing said upper longitudinal ilapsfinto adhesive contact with the coated surfaces of said lower longitudinal naps. Y

29. 'In a machine for folding and sticking work# #pieces to produce bags. pockets, double pockets and envelopes, means for supporting a stack of work-pieces, means forextracting fslngle workpieces from the stack with simultaneous frmation of a i'rst longitudinal fold. means 'for imf mediate subsequent. formation'V of a second longitudinal fold,v rotary meansfv adapted vto receive the longitudinally'folded work-pieces from the means producing the second longitudinal'fold and to impart to said work-pieces a translatory movement, in a Adirection transverse to their longitudinal folds while preparing said Aworkpieces for transverse folding, endless conveyor means adapted to receive pieces from said rotary means, transverse .folder means and transverse-flap sticking means associated; with said endless conveyor means and .means for receiving finished work-pieces from said rotarymeansy aid endless conveyor means, includingmeans for uniting produced`by the longitudinal folding 'of workpieces for bags and bag-type envelopes, which last named means comprise a pair of rotary members adapted to feeda work-piece between them, one of said rotary members being a driving mem-rV ber, and suction means and, adhesive applying means associated with 'said Adriving member topartake in the uniform rotation thereof, said suc- 4tion means being organized to raise the upper overlapping flaps onel of the overlapping longitudinal naps tein- 4 porarily from the sublacent lower longitudinal.

- nap in the work-piece in transit between sind the prepared work y aovaiss' tudinal folds while preparing 'said work-pieces'A for rotary members and said adhesive applying means being organized to enter beneath the tem' porarily' raisedv upper longitudinal iiap, to apply adhesive to the lower longitudinal flap and to emerge Lfrom between the saidflaps before the temporaryl raising of the said upper ilap by the suction means is terminated.V

.30; In a machine for folding. and sticking lwork-pieces to produce bags, pockets, double pockets Aand envelopes, means for supporting a stack of work-pieces, means for extracting single `work-pieces from the stack with simultaneous the means producing the second longitudinal fold and to impart to said work-pieces a translatory movement in a direction transverse to their longitudinal folds while preparing said work-pieces for transverse folding, endless conveyor means adapted to receive the prepared work-pieces from said rotary means, transverse folder means and transverse flap sticking means associated with said endless conveyor means and means for receiving finished Work-pieces from said endless conveyor means, said rotary means including mear-1s for uniting overlapping aps produced by the longitudinal folding of work-pieces for bags and bag-type envelopes, winch last named means comprises a pair of rotary members adapted to feed the work-pieces between them, one of said rotary members being a driving member,suction means organizedfor temporarily raising the upper Aone of said overlappingI longitudinal flaps from the s'ubjacent lower longitudinal flap in a workpiece in transit between said rotary members,

means for applying adhesive to thelower longitudinal flap while the upper longitudinal flap is raised, said suction means and said adhesive applying -means partaking in the uniform rotation of said driving member, and means for imparting to said suction means and to saidj adhesive applying .-means, a varying velocity which,

for the raising of the ,upper longitudinal Aflap and the application of 'adhesive to the lower longitudinal flap, isl higher than the velocity` of feed of the work-piece but, for recession of the adhesive applying means and lowering of the l upper longitudinal flap on to the adhesive-coated formation of a first longitudinal fold, means for immediate subsequent formation of a second longitudinalfold, rotary means adapted to receive the longitudinally folded work-pieces froml s the means producing the lsecond lbngltudinal fold' and to impart to saidwork-pieces a translatory movement in a direction transverse to their longitudinal folds while preparing said work-pieces'- I for transverse. folding, endless conveyor means adapted to receive the prepared work-pieces from.

saidrotary means, transverse folder means'vand transverse flap sticking means associated with said endless conveyor means and means for re-`,

ceiving nnished work-pieces from saidendless conveyor means, said rotary means including means for uniting overlapping flaps produced by the longitudinal folding of work-pieces for bags and bag-type envelopea/svhich last named means comprises a pair of rotary members adapted to feed the work-pieces between them, one of said rotary members being a driving member, suction means organized for temporarily raising the upper one of said overlapping longitudinal flaps from the subjacent lower longitudinal flap in a work-piece in transit between said rotary members, means for applying a coating of adhesive to the lower .longitudinal flap while the upper longitudinal flap is raised, means for separating said lower longitudinal flap from said adhesive applying means after application of said adhesive coating, said suction means, adhesive applying means and lower ap separating means partaking in Hthe uniform rotation of said driving member, and means for imparting to said suction means, said adhesive applying means and said lower flap separating means a varying velocity which, for the raising of said upper ap and the application of the adhesive coating to said lower flap, is higher than the velocity of feed of the work-piece but, for separation of said lower flap from the adhesive applying means, recession of said adhesive applying means and 25 lowering oi said upper flap on to the adhesivecoated surface of said lower flap. becomes lower than said feed velocity of said work-piece.

32. The device according to claim 3l, characterized by the said lower ap separating means including an element movable into contact with the lower longitudinal flap of the work-piece behind the adhesive applying means, means operative to maintain said element out of contact with said lower ilap during application of the adhesive coating thereto and means operative to press said element on to said lower iiap during recession of said adhesive applying means from said lower flap.

33. In a machine for folding and sticking .work-pieces to produceV bags, pockets, double pockets and envelopes, means for supporting a stack of work-pieces, means for extracting single work-pieces from the stack with simultaneous formation of a first longitudinal fold, means for immediate subsequent formation of a second 1ongitudinal fold, rotary means including a pair of coacting .rotary feed members adapted temporarily to arrest and align work-pieces received from the means forming the second longitudinal fold, before imparting feed movement to such work-pieces, endless conveyor means adapted to receive' the prepared work-pieces from saidrotary work-pieces from said endlessV conveyor means.

ALFRED WINKLER. MAX DNNEBIER.

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