US1914019A - Machine for making square-bottomed paper bags with stepwisely fed paper tubes - Google Patents

Description

June 13, 1933.

BAGS WITH STEPWISELY F F. HLSCHER MACHINE FOR MAKING' SQUARE BOTTOHED PAPER ED PAP-ER TUBES Filed Nov. 27, 1931 2 Sheets-Sheet 1 9 2 l 0., n M M 9 e 9 S 1 t e m m P. s 2

June 13, 1933. F. HLscHER MACHINE FOR MAKING SQUARE BOTTOMED PA BAGS WITH STEPWISELY FED PAPER TUBES Filedl Nov. 27, 1951 Patented June 13, 1933 1,914,019

UNITED STATES PATENTOFFICE FRITZ HLSCHER, F LENGKERICH, GERMANY MACHINE FOR MAKING SQUARE-BOTTOMED PAPER BAGS WITH STEPWISELY FED PAPER TUBES Application led November 27, 1931, Serial No. 577,623, and in Germany November 28, 1930.

This invention relates to machines for wise arranged diagonal of the bottom fold making square-bottomed paper bags, esrespectively. pecially those without side folders or folded A preferred constructional form of the intucks, and with stepwisely fed paper tube. vention has been shown in a somewhat In machines of this character up to now diagrammatic form by the4 drawings accom- 5 during the intervals in the feeding of the panying .the specification, and wherein: paper tube at the front end of the same the F 1g. l is a side elevation of the main parts bottom square has been formed by the co` of the machine; operation of a sheet metal gauge and a re- Fig. is a still somewhat more diagramciprocating finger, pushing the paper over matic s1de elevation drawn on a larger scale, the folding roller. By this reciprocating and in which for simplicitys sake parts have finger in machines operating with high speed been omitted; l frequently tearing of the paper has occurred, 1g. 3 is a partial plan view showing the especially if sensitive material, such as that palr of grippers 1n the moment in which they one which is well known under the trade have Just engaged the front edge of the upper name Cellophane, is used for making the layer of the paper tube; paper bag v Fig. 4 is a side view of the grippers in It is the object of this invention to avoid another operative position; this drawback and to create an arrangement F 1g. 5 1s a plan View corresponding to Fig. for preventing the danger of tearing the 3 showing the moment in which the diamond material, occurring with the high speed. fold has Just been formed by the gippers. According to the invention with this inten- It may be mentioned that in the drawings tion one single pair of gripper-S is used, for simplicitys sake such parts, which are which, during the intervals, is caused to move H Ot necessary for understanding the invenin the direction of the axis of the papel` tube tion and which are known as to their action,

so as to be introduced into the slightly opened have not been shown. end of the tube. and then to grip the edge of F 1S the framework of the machine supthe upper layer in its middle whereupon it is Poftng the Cooperatmg Parts l and 2 are caused to perform a swinging circular movef'edmg rolls for repeatedly and 1n 3g Step' nient by which the gripped layer is pulled WS@ manner feedmg the Paper tube 3 1U 'the over the edge ofthe ruler. It has been found dlrectlon of the arrow 1n Fgs- 1 t0 3 4 1S a stationary knife which cooperates with a rethat on account of the slight tension 1n which ciprocating knife 5, the latter being peri0di the paper is kept any tearing of it is avoided. c

i ally moved up and down by known means Aften this Swmgullg moverlent the uur of (not shown) after the paper has been pushed 8( grlppfrsfs than. le else( an lll'elurne forward for the length necessary for form- SVlngmg gUPPelS are We nown m @he ing a paper bag beyond the cutting level of paper bag machine art, even these which the knives 4, 5 PQI'OI'm a 1`eC1P1'0Cat-mg a? Wen as. a SYVmg' For simplicitys sake in the following the 4o ing movement. The invention consists .in the cooperating parts may be described in concreating of a machine 1n which the grippers nection with the description 0f their Cooperare so arranged as to clutch the edge of a ation: layer of the tube in its middle, and then to The paper tube 3 formed at the righthand erforin a swinging. movement around the of Fig. 1 by known means is pulled forward front edge of the folding roller and the orossby the above mentioned feeding rolls 1 and tia 2, and in this forward movement it surrounds the sheet metal form or gauge 6, the shape of which has been shown in dotted lilies in Fig. 3. rlhe feeding rolls 1 and 2 are periodically driven from the continuously rotating main shaft M of the machine by means of a crank disc A with adjustable crank pins B and a rod C pivoted to a toothsegment D supported at E in the framework of the machine, which, by means of the tooth-wheel G operates another tooth-wheel which has the same diameter as the feeding roll 2, and which is so arranged upon the shaft of this roll that it only drives the same if the crank A, B swings the segment l) opposite to the direction of the clockhand in Fig. 1. During the swinging movement the paper tube 3 is fed, whereas the feeding rolls are kept stationary when the segment D is rotated in the direction of the clockhand.

'lhe two feeding rolls 1 and 2 are geared together in such a way that they simultaneously rotate inversely. The roller 1 is sup` Vported by a lever 1 in such a way that it may be elastically pressed by its own weight or other well known means against the upper side or layer of the paper'tube. This feeding device is well known.

After the described feeding device 1 and 2 has fed the paper tube for a length dependent on the adjustment of the pin B at the disc A and has come to a standstill, then the knife 5, which up to this moment was in a lifted position, is moved downward cutting off between itself and the. under-knife 1 the fed length of the tube. whereupon the knife 5 is at once lifted again. Now the devices which are significant for the. present invention become operative. These devices comprise pins 7 arranged below the front end of the paper tube close to the cutting device 4, 5 periodically moved up and down, and one pair of grippers forming tongs 8, which performs areciprocating as well as a swinging or oscillating movement. These parts in their action are co-operating with the. gauge 6 within the paper tube and a ruler 9 situated close to the upper side of the tube.

As soon as the knife 5 is lifted, the two pins arranged at both sides ot the middle line or axis of the tube, as may be seen from Fig. 3, are lifted so as to meet the underside of the papel' tube outside of the front edges 6a of '1 the gauge 6 arranged at a right angle to each other as shown in F ig. 3. By this. the tube at its eut` front edge is sli ghtly opened as outlined in Fig. 3 so that its upper layer is lifted away from the gauge 6. B v this.v the said layer is brought into a position in which it. may be gripped by the tongs or pair of `grippers 8.

This pair of grippers is supported sidewise from the paper tube and the sheet metal gauge 6 by an arm 30, rotarily arranged upon newbie a shaft H supported by the framework F. A projection 29 of this arm 30 is connected by means of a link 26 to a double-armed lever 25 rotarily supported at 25 in the framework F and bearing at its end remote to the link 26 a roll being held in operative connection by any well known means (for instance by springs which are not shown) with a cam disc 28 rotated from the main shaft M by a gearing, which has been shown in Fig. 1 but which needs no further description. This cam disc 28 is so arranged that it'brings, immediately after the operation of the knlfe 5, the lever 25 from the dotted position shown in Fig. 2 into the position shown in full lines in the said figure, so that the arm 30 with the pair of grippers 8 is moved for a short way from the left to that position in which it has been shown in Figs. 1 and 2; during this movementthe grippers are held separated, so that they may embrace the lifted upper layer in its middle at the point 10. When this has been done the pins 7, which may be operated for instance by a cam mechanism (not sh own) from the main shaft M, or which may b e dependent on the driving means of the knife 5 in such a manner that they are only lifted when the knife 5 has been completely lifted, may be sunk again below the level in which the paper tube is fed.

Between the arms 20, 21 of the grippers a compression spring 22 is arranged in such a manner that it always tries to keep the ends closed. The said pair of grippers is rotarily supported upon a shaft 30 arranged at the upper end of the arm 30 and is in connection with a. sprocket or chain-wheel 14 supported by the same shaft. A chain 15 connects this sprocket wheel with another sprocket wheel 16 rotarily supported by the shaft H. and an adjustable crank pin 16 of this wheel is engaged b v a rod 19 provided with a roll 18 at its other end. which is constantly kept in' contact with a cam disc 17 on the. main shaft lid. Here as well springs or the like secure the continuous contact between roll and cam disc 17. Means of this character are well known in the art.

rThe periodical reciprocation of the rod 19 caused by the cam disc 17 periodically oscillates the chain wheel 16 and 14. r1he parts are so dimensioned that the osciliation of the wheel 14. and therefore that oi: the pair of grippers 8. embraces an angle of about 180. Approximately at the end of the oscillation in one or the other direction. the arms 21. 22 respectively. meet fixed but adjustable stoppins 23. 24 respectively, at a cross-piece 30 of the arm 30. whereby the spring 22 is comt pressed and the gripper-s opened.

ln Figs. 1 and 2 the moment has been shown in which the arm 21 of the pair of grippers has been introduced b v the swinging movement into the opened end of the paper tube (see Fig. 3) just after it has left the pin 23,

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Fig. 5, so that the diamond fold is made.

The point of the front edge caught by the pair of grippers has then reached the point connected with the upper end of the lever, the grippers having their gripping ends bent toward the longitudinal axis of the tube for gripping the tube at its longitudinal axis, means for swinging the lever to move the gripping ends into and out of gripping position, means for swinging the gripping ends to and fro after being moved into gripping position, and means to release the gripping ends from gripping position after the initial part of the to and fro Swingin f movement. FRITZ I-I LSGHER.

11 in Fig. 5. In this moment the arm 2O has impinged upon the stop 24 and has opened the 15 grippers again. At the same time the drive for the feeding rolls l and 2 becomes operative again and the front edge of the tube, now provided at its front end with the diamond fold is drawn forward to the left for one paper bag length, which is then cut off by the cutting device 4, 5 as described above. The diamond fold is passed through a pair of rolls 12, 13 and delivered to a pair of conveying bands J (outlined by dotted lines), passed over a number of guiding rolls K and driven in any well known way by the main shaft. These conveying bands deliver the cut olf part to a gluing device L and folding device N, which do not form a part of the present invention and which finish the forming of the square bottom.

The diamond fold when it has left the rolls 12, 13 is secured against opening by means of a reciprocating finger O arranged .closely to the operating table P of the machine and reciprocated from the segment D by means of a link R. At the time during which the knife 5 is operated, the lever 30 with the pair of grippers at its free end has been swung again to the left by the cam 28 and the cam 17 has swung the pair of grippers around the pin 30', so that the grippers have returned again to their initial position, thus the described play can begin afresh.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is A machine for making a paper bag with a square bottom comprising intermittently operated feeding rollers for advancing predetermined lengths of a paper tube, a cutting device including an intermittently operated knife and a stationary knife cooperating to cut an advance length of the tube, a stationary rule determining the cross diagonal of the diamond fold for the square bottom, a

sheet metal gauge engageable in the tube and having inclined front edges 4merging at a point adjacent the cutting device, a pair of vertically rcciprocable pins between the cutting device and gauge and periodically movable toward the tube to open the front edge thereof after each operation of the cutting device. a pivotally mounted lever, a pair of grippers arranged in tong form rotatably

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