US2759542A

US2759542A - Apparatus for cutting a moving broad strip longitudinally and obliquely

Info

Publication number: US2759542A
Application number: US405630A
Authority: US
Inventors: Weisshuhn Peter
Original assignee: SARL LES ATELIERS DE CONST MEC
Current assignee: A Responsabilite Les Ateliers De Constructions Mecaniques C & A Holweg Ltee Ste; SARL LES ATELIERS DE CONST MEC
Priority date: 1953-01-22
Filing date: 1954-01-22
Publication date: 1956-08-21
Anticipated expiration: 1973-08-21

Description

Aug. 21, 1956 P. WEISSHUHN 2,759,542

APPARATUS FOR CUTTING A MOVING BROAD STRIP LONGITUDINALLY AND OBLIQUELY Filed Jan. 22, 1954 2 Sheets-Sheet l Aug. 21, 1956 P. WEISSHUHN 2,759,542

APPARATUS FOR CUTTING A MOVING BROAD STRIP LONGITUDINALLY AND OBLIQUELY Filed Jan. 22, 1954 2 Sheet s-She et 2 8/ I l g 8/! United States Patent APPARATUS FOR CUTTING A MOVING BROAD STRIP LONGITUDINALLY AND OBLIQUE LY Peter Weisshuhn, Zurich, Switzerland, assignor to Societe a respousabilite limitee Les Ateliers de Constructions Mecaniques C. & A. Holweg, Strasbourg, France The present invention has for its object an arrangement for cutting narrow strips with lateral folds intended when out into sections to form fiat bags.

It has already been proposed to cut out of a broad strip of constant breadth one or more narrow strips with lateral folds. purpose include a plurality of separate cutting rollers over which the successive cuts defining the narrow strips are made. Such conventional arrangements are expensive and intricate and do not generally ensure a faultless cut.

The drawbacks of said known arrangements are removed in accordance with my invention insofar as a separate cutting roller provided with longitudinal and oblique cutters is associated with a corresponding counterroller for separating any two adjacent narrow strips, said rollers being submit-ted to rotations of equal variable speeds.

In order to obtain a faultless cutting both for thelongitudinal and the oblique cuts, there is provided a novel and advantageous arrangement which is designed so that the cutting and counter-rollers run during the longitudinal cutting operations at a higher speed than the speed of progression of the broad strip between them while they run advantageously at the same speed as said broad strip during the oblique cuts and at any rate always at a smaller speed than during the longitudinal cutting operations. I

It is of advantage to resort for the control of the rollers to a pair of elliptical wheels which allow driving the cutting and counter-rollers at variable speeds which are however always equal for the two types of rollers.

In order to allow per revolution four modifications altogether in the speed of the two cooperating rollers provided with two oblique cutters and with two longitudinal cutters, it is of advantage to provide between the pair of elliptical wheels and the two rollers provided each with two longitudinal cutting means and with ,two oblique cuttings means, a transmission adapted to make the elliptical wheels execute two revolutions for each one revolution of the two rollers, whereby the rollers are submitted during their revolution to four modifications in speed.

Accompanying drawings illustrate by way of example a preferred embodiment of the invention. In said drawingsz 'Fig. l is a diagrammatic view of a complete machine for the execution of flat bags.

Fig. 2 illustrates a section of a broad strip cut into three narrow strips.

Fig. 3 is a perspective view of the cutting arrangement according to the invention.

Fig. 4 is a front view, partly sectional, of the same cutting arrangement.

Fig. 5 is a cross-section through line 55 of Fig. 4.

Fig. 6 is a partial front view of a section of Fig. 4 on a larger scale.

Fig. 1 illustrates diagrammatically am-achine for the execution of flat bags. The'machine includes a frame The cutting means generally used for this 10 with

lateral walls

101 and 102 carrying the different parts of the machine. Fig. 1 shows only one lateral wall 101 resting on a base 11. On the right hand side of the frame 10, as seen in Fig. 1, is provided a paper reel 12 carried by a spindle 13 and from which a broad strip of paper 14 of constant breadth may be unwound in the direction of the arrow U. This broad strip is subdivided by a cutting arrangement A into a plurality of narrow strips 15. In the example illustrated in Figs. 1 and 2,

there are provided three

narrow strips

151, 152, 158."

The control means forming part of said cutting means and the actual cutting means will be described with further detail hereinafter.

The three narrow strips 15 are guided over a guiding roller 16 towards compensating means B including a roller 18 secured to a pivotal arm 17 and a cooperating roller assuming an invariable posit-ion. One group of narrow strips, say 1511 and 1'53, are guided in the direction of the arrow V over the roller 18 so as to move over a longer track than the remainder of the strip constituted in the present case by the narrow strip 152, which is guided directly over a shorter track from the roller 16 towards the roller .19. Asuitable selection of the track lengths, the relationship between which may be modified by shifting the roller 18, may shift the different narrow strips 15 in a manner such that, upon leaving the roller 19, the transverse sectional lines shown in dotted lines in Fig. 2 at 154, and 156 are brought into transverse register with one another.

Beyond the compensating means B, the narrow strips i 1'5 are guided in the direction of the arrow X through means C producing the lateral folds, said folds being produced by an inward folding, as shown in dotted lines in Fig. 2.

Beyond the longitudinal folding means C are provided gluing means D including a glue container 20, a gluefeeding roller 21 and glue-applying discs 22 adapted to apply the glue over the longitudinal folds. In front of the glue-applying discs 22 is located a roller 23 forming part of the paper-strip driving means E. The roller 23 is driven by the means described hereinafter and the narrow strips 15 are urged against said roller'2'3 'by means of a further roller 24 provided with driving rings. The narrow strips 15 continue their movement beyond said gluing means towards means F cutting the strips transversely along the lines of separation 154-155- 156. Said transversely cutting means F include a cutting roller 25 and a counter-roller 26 and the cut sections are transferred thence into means G producing the transverse folds and including a folding cylinder 27 and a transverse folding blade carried by the rings 28; the bags 29 are formed into a stack at 30.

The control of the complete machine forming fiat bags is provided by a motor that is not illustrated and which controls the

cylinders

27 and 28 through a suitably designed transmission. Further control means, which are not illustrated, control the transverse cutting means F together with a shaft 311 revolubly mounted at 3'9 and 40 inside the frame 10. The upper end of-the shaft 31 carries also a bevel wheel 32 meshing with a further bevel wheel 33 rigid with the above-mentioned means F and the transverse folding means G. Thus Patented Aug. 21, a"

finished paper rah'gement' according to the invention to be more readily understood; Hereinafter, only the'cut'tin'g means A will be disclosed With further detail, reference being made to accompanying Figures 3 to 6.

The above rrientio'ned shaft 35 carries abevcl wheel 50' meshing with a further bevel wheel 51'', which latter is rigid with a shaft-52 revolubly mounted at 53 in-the side wan 101 of the frame through the agency of 'a chair 54- (Fig'. The shaft 52 carries further an elliptical wheel 55 meshing with a further elliptical wheel 56. The latter elliptical wheel' 56 is rigidwith a shaft 57 revolubly carried at58by the side wall 101, saidshaft 57 carrying at its end a toothed wheel 59 the distance of which with reference'to the elliptical'wheel 56 is defined by spacing rings 60 (Fig. 4). The toothed wheel 59' meshes with a toothed wheel 61 rigid with a shaft 64 carried at 62 and 63' in the

side walls

101 and 102. The above-mentioned toothed'wheel 61 meshes in its turn with a toothed wheel 65 rigid with afurther shaft 68 revolubly carried at 66 and'at 67- between the

side walls

101 and 102. As shown in Fig. 4, the

side walls

101 and 102 of the frame are connected by a tie-rod 69 secured by means of nuts 70 to said side walls.

The shaft 68 carries the actual cutting rollers while the shaft 64 carries the counter-rollers which are slidably mounted on it. For this purpose, the shaft 68 is provided with a groove 681 engaged by a wedge not illustrated which serves for guiding the cutting rollers. After positioning of the cutting rollers to suit the desired breadth of bag, said cutting rollers are secured in position by means of clamping screws 71. The number of cutting and counter-rollers is equal to four in'the example illustrated corresponding to the obtention of three narrow strips.

Fig. 6 illustrates a cutting roller shown separate with the corresponding counter-roller on a larger scale. The shaft 68 carries a plate 72 of which the side directed towards the right hand side'of Fig. 6 corresponds in shape to the desired shape of the narrow strips. To said side of the-plate is applied under pressure a cutter 79 throughthe'agency of the

parts

73, 74 and-75 which are held fast by'screws-76,.77 and 78; The actual cutter includes in successiona longitudinally cutting section 7&1, an oblique cutting section 792 and a further longitudinally cutting section-793. The other sideof the cutter includes a further oblique cutting section which cannot be seen in Fig. 6. After the counter-roller has been suitably positioned both axially and radially, said counter-roller is also securedthrough clamping screws 80. Each counter-roller 81 is secured to the shaft 64 through ascrew or pin 80,

said counter-roller bring provided with longitudinalgI'QOvcs 811 and 8 13 extending in adjacent transverse cross-sections and connected by oblique grooves 812, so as to correspond to the

different sections

791, 793 and 792 of the cutter 79.

The transmission ratios between the different toothed Wheels are-selected so thatthe

wheels

50 and 51 increase the speed in a ratio as between'l and 2, while the toothed wheels 59 and61 reduce the speed by an equal amount. The

toothed wheels

61 and 65 have equal numbers of teeth'andthe same is the case for the

elliptical wheels

55 and 56.

The above-disclosed transmission ratios are such that Now, if it is desired to modify for a constant breadth of bag thelengths' of thesuccessive bag sections unwound from the reel, it is possible for instance to modify the speed of the

strips

14 or 15, for instance by changing the

bevel wheels

32 and 33 or by modifying the transmission at another point, so thatthe'ratio between the speed of the cutting means and the speedof the paper strip is modified. When the speed of the cutting rollers and of the cooperating counter-rollers remains unaltered, the increased speew of the strip leadsobviously to an increase in the length of the bagsections that a'rebeing unwound.

The arrangement of'the transmission illustrated'inFigs. 3 to 5 is-designed in accordance with the invention so that the speed of the cutting rollers and of their counterrolle'rs is higher than the'speed of the-paper strip"so'as to obtain a clean cut. In the execution of the oblique cuts, it is however necessary, in order to prevent any tearing or deformation of the paper strip for the speed of the oblique cutter to be equal to orat least not very difterm from the'sp'eed of the paper strip, the difference between last-mentioned speeds being held below a predetermined value.

WhatI'claiIn is: I

1. A machine for cutting bag blanks out of a broad strip, comprising a shaft, a number of cutting rollers carried by said shaft'andincluding each a peripheral cutter constituted by two longitudinal sections in two slightly spac'ed cro'ss sections and two oblique sections interconnec'tirig the two longitudinal sections to form therewith a continuous cutter ouline' adapted to cut a zig-zag line, a second shaft, parallel to the first shaft, counter-rollers cooperating with the corresponding cutting rollers, carried by the secondshaft and leaving a gapbetween them and the cutting rollers, means for" feeding the broad strip through the gap between the cutting rollers and the counter ro'lle'rs to" cut said strip into a number of narrow longitudinal strips defined by the number of cutting rollers and counter-rollers, rneans for driving the two sh'afts'atconstantly equal'speeds'a'nd transmission means controlling said driving'means and adapted to modify said speeds periodically during each revolution of' the shafts by inc'reas'ing'the speed of the cutting rollers over that of th'e broad strip during engagement of the latter by the longitudinal sections of the cutters and by sub stantially equalizing the speed of the cutting rollers with that of the broad strip when the later' is engaged by the oblique cross sections of the cutters.

21 A machine for" cutting bag blanks out of a broad strip, comprising a shaft, a number of cutting rollers carried by" said shaft, said cuttingv rollers being shiftable longitudinallyof' said shaft and including'each a peripheral' cutter" constituted by two longitudinal sections in two" slightly spaced crosssec'tio'ns and two oblique sec tions interconnecting'the'two lo'n'gitudinalsections to form therewith a continuous cutter outline adapted to cut a zig-z'ag line, a second shaft, parallel to the first shaft, counter-rollers cooperating with the corresponding cutting rollers, carried by the secondsha'ft and leaving a gap between them and the cutting rollers, said'counter-rolle'rs being shiftable longitudinally of the second shaft for registerin'g with said cutting rollers, means for feeding the broad strip through the gap" between the cutting rollersand the counter-rollers to cut said strip into a number of narrow longitudinal strips defined by the number of cutting rollers and counter-rollers, means for driving'the two" shafts at constantly equal speeds and transmission means controlling said driving means and adapted to modify said speeds periodically during each revolution of the shafts, the speed of the cuttingr'ollers being higher than the speed at which the broad strip is fed thereto during engagement of the broad strip by the'longitudinal' sections of the cutters and the speed of said cutting rollers being substantially the same as the feeding speed of'the broad strip during engagement of the broad strip by the oblique" sections of the cutters;

3; A machine" for cutting bag blanks out of a broad" strip, comprising a shaft, a number of cutting rollers carried by said shaft and including each a peripheral cutter constituted by two longitudinal sections in two slightly spaced cross sections and two oblique sections interconnecting the two longitudinal sections to form therewith a continuous cutter outline adapted to cut a zig-zag line, a second shaft, parallel to the first shaft, counterrollers cooperating with the corresponding cutting rollers, carried by the second shaft and leaving a gap between them and the cutting rollers, means for feeding the broad strip through the gap between the cutting rollers and the counter-rollers to cut said strip into a number of narrow longitudinal strips defined by the number of cutting rollers and counter-rollers, means for driving the two shafts at constantly equal speeds and transmission means controlling said driving means and adapted to modify said speeds periodically during each revolution of the shafts, the speed of the cutting rollers being higher than the speed at which the broad strip is fed thereto during engagement of the broad strip by the longitudinal sections of the cutters and the speed of said cutting rollers being substantially equal to the feeding speed of the broad strip during the engagement of the broad strip by the oblique sections of the cutters.

4. A machine for cutting bag blanks out of a broad strip, comprising a shaft, a number of cutting rollers carried by said shaft and including each a peripheral cutter constituted by two longitudinal sections in two slightly spaced cross-sections and two oblique sections interconnecting the two longitudinal sections to form therewith a continuous cutter outline adapted to cut a zig-zag line, a second shaft, parallel to the first shaft, counter-rollers cooperating with the corresponding cutting rollers, carried by the second shaft and leaving a gap between them and the cutting rollers, means for feeding the broad strip through the gap between the cutting rollers and the counter-rollers to cut said strip into a number of narrow longitudinal strips defined by a number of cutting rollers and counter-rollers, means for driving the two shafts at constantly equal speeds and transmission means controlling said driving means and including a pair of interengaging elliptical wheels controlling said driving means and adapted to modify said speeds periodically during each revolution of the shafts, said transmission means increasing the speed of the cutting rollers over that of the broad strip during engagement of the latter by the longitudinal sections of the cutters and substantially equalizing the speed of the cutting rollers with that of the broad strip during engagement of the latter by the oblique sections of the cutters.

5. A machine for cutting bag blanks out of a broad strip, comprising a shaft, a number of cutting rollers carried by said shaft and including each a peripheral cutter constituted by two longitudinal sections in two slightly spaced cross-sections and two oblique sections interconnecting the two longitudinal sections to form therewith a continuous cutter outline adapted to cut a zig-zag line, a second shaft, parallel to the first shaft, counter-rollers cooperating with the corresponding cutter rollers, carried by the second shaft and leaving a gap between them and the cutting rollers, means for feeding the broad strip through the gap between the cutting rollers and the counter-rollers to cut said strip into a number of narrow longitudinal strips defined by a number of cutting rollers and counter-rollers, means for driving the two shafts at constantly equal speeds and transmission means controlling said driving means and including a pair of interengaging elliptical wheels, means driving said elliptical wheels and a gear connecting the elliptical wheels with the shaft driving means, whereby said elliptical wheels execute two revolutions for each revosution of the shafts carrying the cutting rollers and the counter-rollers to make said rollers assume four modifications in speed during each of their revolutions, said transmission means increasing the speed of the cutting rollers over that of the broad strip during each engagement of the latter by the longitudinal sections of the cutters and substantially equalizing the speed of the cutting rollers with that of the broad strip during engagement of the latter with the oblique sections of the cutters.

6. A machine for cutting bag blanks out of a broad strip, comprising a shaft, a number of cutting rollers carried by said shaft and including each a peripheral cutter constituted by two longitudinal sections in two slightly spaced cross-sections and two oblique sections interconnecting the two longitudinal sections to form therewith a continuous cutter outline adapted to cut a zig-zag line, a second shaft, parallel to the first shaft, counter-rollers cooperating with the corresponding cutting rollers, carried by the second shaft and leaving a gap between them and the cutting rollers, said counter-rollers being provided each with two annular peripheral grooves connected with two oblique grooves and spaced by a distance equal to the spacing of the longitudinal sections of the cutter in the corresponding cutting roller, said longitudinal sections being adapted to engage the corresponding grooves in the counter-roller and the oblique sections being adapted to engage the oblique grooves in the counter-roller, means for feeding the broad strip through the gap between the cutting rollers and the counter-rollers to cut said strip into a number of narrow longitudinal strips defined by the number of cutting rollers and counter-rollers, means for driving the two shafts at constantly equal speeds and transmission means controlling said driving means and adapted to modify said speeds periodically during each revolution of the shafts, said transmission means increasing the speed of the cutting rollers over that of the broad strip during engagement of the latter by the longitudinal sections of the cutters and equalizing the speed of the cutting rollers with that of the broad strip during engagement of the latter by the oblique sections of the cutters.

References Cited in the file of this patent UNITED STATES PATENTS 1,306,499 Novick June 10, 1919 1,433,138 Kruse Oct. 24, 1922 2,060,821 Novick Nov. 17, 1936