US2101191A - Web cutting mechanism for bag machines - Google Patents

Description

G. w. POPPE WEB CUTTING MECHANISM FOR BAG MACHINES 4 Sheets-Sheet l Dec. 7, 193 7.

Filed Dele. 1, 1936' Dec. 7, 1937. G. w. POPPE 2,101,191

WEB CUTTING MECHANISM FOR BAG MACHINES De.7,1937. GW. PQPPE 2,101,191 l WB CUTTING MECHANISM FOR BAG MACHINES Filed Dec. 1, 1956 4 Sheets-Sheets INVENTOR GEO/EGE W PoP/2f ATTORNEY Dec. 7, 1937. G. w. POPFE 2,101,191

WEB CUTTING MECHANISM FOR BAG MACHINES Filed Deo. l, 1936 4 Sheets-Shes??4 4 INVENTOR GEORGE M. POP/PE.

ATTORNEY PatentedA Dec. 7, 1937 WEB CUTTING MEcrIANIsM ron MACHINES 'PATIENT' OFFICE BAG George W. Poppe, Brooklyn, N. Y., assigner to lEquitable Paper Bag Co., Inc., Brooklyn, N. Y., a corporation of New York Application December 1, 1936,-Seriai No. 113,565

Claims.

The present invention relates to a machine for making paper bags and more particularly to im-` provements in the devices whereby the preliminary cuts are made in a web of lpaper prior to 5 folding the same to form a bag tube section which is finally to result in a finished bag.

In my Reissue Patent 19,921 granted April 7, 1936,- the flap of the bag is produced by first making cuts in a web of paper, the cuts being spaced l0 from the edge of the web and running generally in a longitudinal direction. In Figures 6 to 8 inclusive of said patent there is shown a pair of dies each of which is set at a slight angle tothe line of feed of the web and said dies are mounted to rotate on a shaft as shown in Figure 2 of said patent. i I

Commercial requirements make it. necessary that bags of diierent lengths may be made at will, and machines of the character described in r complished in machines of the priorv art, such as illustrated in said patent, it has been the practice to provide a number of dies each with a different radius.

The object of the present invention is to properiy slit any length of tube within the capacity of the machine in a more efficient manner than heretofore and also to make diierent length slits for determining the length of the ap on any tube length within the capacity of the machine with Va single set of rotary cutters.

In my Patent 2,054,297, granted September 15, 1936, a single set of dies having a.A rectilinear movement is provided, said dies being driven by a 'pair of cams and the speed of the die is. made to conform to the surface speed of the web by means of a pair of cams so shaped as to accomplish the desireduresult. However, in-this machine the cams which move the dies must have the proper shape and different sets of cams are required for different lengths of bagr tube sections.

In said patent the dies h. ,ve a rectilinear move'- ment during the cutting action, While for high speedoperation to which these .machines are subjected, it is preferable that the motions be rotary as far as possible. v

speed of the web. In order that this may be ac- The present invention provides a single set of rotary dies ,with means for coordinating the speed of the-dies to correspond substantially with vthe speed of the paper forany length of bag tube section Within the capacity of the machine and also provides means for varying the lengt/h of cut of the dies .to enable dierent sized flaps to be made.

A feature of the invention therefore resides in the provision of cutters in the form of rotary dies with driving connections for the cutters including rotary gears and means for varying the eccentric movement of said gears in equal and opposite degree to vary the peripheral speed of the cutters so that such speed during the cutting action will accord substantially with the surface 'speed of the web as the latter is advanced by the usual feed rollers. L,

Further features and advantages will be apparent from the following description and claims when taken in connection with the accompanying drawings in which:

Figure l is a side elevation of theieft of the machine.

Figure 2 is a longitudinal sectional View.

Figure 3 is a top plan View of the right-hand portion of the machine as viewed in Figure 2.

f Figure 4I is an enlarged sectional view on the line t-t of Figure 2.

Figure 5 is a detailed elevational view showing 'the eccentric connections to the cutters in nor-- mal or neutral adjustment."

Figure 5a is a detail of 'an instrument for addusting certain eccentrics in unison.

r Figure 6 is a diagrammatic view illustrating howal change is made in the adjustment of the eccentrics from the position shown in Figure 5 1 to a position to make abag in which a tooth change gear is used.

. Figure 7 is a similar diagrammatic view show- -ing the adjustment of the parts to make `a bag of a length in which a tooth change gear isused.

Figure 8 is a diagrammatic' view showing the development of the bag tube.

Figures 9 to 12 inclusive are details of bag tube sections. l l

Referring to the drawings and particularly to Figure 2the reference character 2 indicates one of the side frames of theI machine, the other side frame being shown in Figure 1. y 50 A roll of paper t is supported in these side y frames and a web 6 drawn from said roll passes over a guide roller 1 and betweena printing cylinder 8 and an impression roller 9. The web then passes over idlers I0, Il, l2, I4, and I6, thence, 55

'Figure 3) carried by up-standing portions 20 projecting from side frames 2. As the web passes under the former, it is folded over on -it in the usual manner to form a bag tube as shown diagrammatically in 'Figure 8. The tube and web are continuously fed through the machine by means of upper feed rollers 22 and a feed roller 23 carried by ' shafts 24 and 25 respectively. A gear 26, Figure 1, on shaft 24 meshes with a similar gear 2 on the shaft 25 whereby both upper and lower feed rollers are driven in unison. The upper feed roller shaft is supported from the side frames 2, Figure 1, by means of up-standing frames 26a one on each side of the machine and '-the shaft is adjustable for tension by means of screws 28 one of 4which is shown in Figure 1.

After the tube passes the feed rollers it is severed into bag tube sections and for this purpose any' suitable mechanism may be' used. In the present embodiment, however, such severing is eected by a serrated edge 30 of the former in conjunction with a serrated edge 32 of a lip knife 33. Prior to the severing operation, the tube is slightly retarded by means of pinch bar mechanism of the usual type. This mechanism includes a lower pinch bar shaft 34 and an upper pinch bar shaft 36. The lower shaft carries a cylindrical roller and the upper shaft carries a roller which is provided with a segmental portion 38 of slightly greater radius than the main portion of the roller and which is so timed that this segmental portion engages the tube for a sufficient length o-f time to permit the necessary slack to be gathered in the tube. The segmental portion is of less radius than the radius of the feed rollers 22 and 23 and therefore does not feed the tube along as fast as it is advanced by the feed rollers, hence a slack. in the tube results. A sprocket chain 31 passes over sprockets 38 and 39 driven from the lower pinch bar shaft 34 through means of gearing 4U, 4I and 42, Figure l, as is usual in machines of this general type. Stnker bars 43 are carried by the sprocket chain 31 and the timing is such that when the segmental portion 38 of the upper pinch bar roller retards the tube and produces a slack therein, one o-f the striker bars 43 gives the tube a sharp blow from beneath, severing o-ne wall of the tube against the edge of the former and the other wall against the lip knife. This matter of severing will be more apparent from a consideration of Figure 8, the upper wall of the tube being severed along the linev b-b and the lower wall being severed along the dotted line c-c. This matter of severing is fully set forth in my reissue patent above referred to. The severed tubepasses to a tucker blade and paste bar cylinder 44 cooperated with a clamp cylinder 45. A paste bar 46 receives paste from a roller 48 supplied by a paste pot 50, for sealing the bottom of the bag in the usual manner. From. the clamp cylinder 45 the finished bag is delivered by any well known mechanism.

The mechanism above described with the exceptlon of some modification in the idlers for guiding the web, is substantially that used in machines of this general type as illustrated in my Reissue Patent 19,921 above referred to.

The various parts of the machine receive their motion through the lower pinch bar shaft 34 and this shaft may be driven in any suitable wey although the particular driving means is not shown in the drawings.

v The present invention is concerned with the proper control of the cutters for making the diagonal cuts in the web prior to folding the same into a bag tube, as illustrated diagrammatically in Figure 7. Variations in the length of a bag tube which may be produced on the same machine are brought about through the medium of change gear mechanism between the lower pinch bar shaft 34 and the lower feed roller shaft 25. The shaft 34, which may be considered as the driver or prime mover, makes one rotation for each bag tube section cut off from the main tube. By using change gears of different numbers of teeth, the ratio of drive between the pinch bar mechanism and feed rollers is varied. If the ratio transmission between the pinch bar mechanism and the feed rollers is as one to one a bag tube section of a denite length depending upon the length of the circumference of the feed rollers will be cut off by the severing mechanism. If the ratio of transmission is less than one to one, a bag tube section of shorter length will be cut olf. Similarly if the ratio is greater than one to one a bag tube section of greater length will be cut oi because during one rotation of the pinch bar mechanism the feed rollers would feed a greater length of the tube to the severing mechanism. A number of change gears such as 40, each having a different number of teeth are mounted on the shaft 34. An intermediate idler gear 52 is supported on the lower feed roller shaft 25 in a carrier 56. vWhile a number of gears such as 40 having different numbers of teeth may be mounted on the shaft 34, the usual practice is to use one change gear at a time.

From a consideration of Figure 8 it will be understood that the cuts 62 are made in the web cuts by their length and their distance apart transversely of the web determine the Width and length of the closing ap in the finished bag. After a bag tube section has been cut off from the main tube, a section similar to that shown in Figure 9 is the result. 'I'he present.invention contemplates making bag tube sections of any length between that shown in Figures 9 and 11 and that shown in Figures 10 and 12. By varying the length of the cuts 62 ilaps of different lengths may be produced, the shortest flap being shown in Figure 11 and the longest in Figure 12 although these are merely illustrative of a practical range of which the machine is capable.

In the type of machine shown in my Reissue Patent 19,921, the shaft carrying' cutters was driven directly from the lower pinch bar shaft, hence in machines of the type illustrated in said patent, it is necessary to provide cutters or dies of different radius for different'lengths of bag tube sections because in order to make a proper cut the peripheral speed of the cutters or dies must be substantially the same as .the surface speed of the -web during the cutting action. Therefore, when using machines of the character shown in said reissue patent it has heretofore been necessary to have a great many dies and die holdersin order to provide for bags of different lengths. This diiculty has been overcome in the machine of my Patent No. 2,054,297 previously referred to and the present invention is an improvement of said machine. I am also aware of the application of Walter Bochow, Serial No; 101,565, 4filed September 19, 1936, in which the speed of the cutters is varied so that during the cutting action thereof their peripheral speed accords with that of the `surface speed of the web, and I make no claim in the present application l y 2,101,191 broad enough to read on said Bochow application..

pinch bar shaft 34, and a cutter shaft 84, and I provide means for varying the eccentricity of the driving connections to accord with the particular change geaiin use at any particular time.

The cutters 66 are suitably supported in cutter blocks 81 which blocks are clamped to the shaft 84 by means of clamps 68. In this way the cutters may be adjusted longitudinally of the shaft Y to provide for the proper distance between the cuts 82 as is..necessary for different widths of bags to be produced (see Figures 3 and 4), the cutting edge of which die is 4of a length equal to or slightly greater than the longest cut 62 which the die will be called upon to make.

The shaft 84 is supported in the side frames 2 and to provide for vertical adjustment of the shaft, said shaft is provided with a bearing box 18 at each end thereof and set screws 12, Figure irovide for accurate vertical adjustment of the s ft.

In the present embodiment the shaft 64 is rotated once for each bag tube section but during approximately one-half of the rotation of this shaft it moves at a speed which is different from that during the other one-half of 'its rotation. In other words during the cutting action the peripheral speed of the die is substantially equal to the surface speed of the paper. This peripheral speed during the cutting action may be slower or faster than the speed during the remaining portion of this rotation depending upon the adjustment of certain eccentrics which will now be l described.

Referring to Figure 2 the lower pinch bar shaft 84' carries a sprocket 14 about which passes a sprocket chain 16 which chain at the upper portion of the machine passes over a sprocket 16 carried by a stud shaft 88, 'Figure 4. The stud shaft 88 is supported from the machine fram'e2 on the left side of the machine. by a plate 82 secured to the side frame by screws 83 one of which is shown in Figure 4. The sprocket 18 is provided with an extended sleeve 8| which sleeve is loosely mounted on the shaft 88 and is capable of slight longitudinal movement thereon for a purpose to be later referred to. A sleeve 84 is mounted eccentricaliy on the sleeve 8lv and a clamp 86 enables the sleeue 84 to be clamped to the sleeve 8l at will. A gear 88 is eccentrically mounted on the sleeve 84 and may be clamped' thereto by means of a clamp 891similar to the clamp 86.

With the structure just. described, if both clamps 86 and 89. are tightened, the gear 88 will be driven with the sprocket 18 which in turn is driven from the lower pinch bar shaft 34 'and the a clamp 88 by which it may be clamped to the sleeve 88 and said gear ls eccentricaliy mounted on said sleeve 88. Gears 88 and 92 are of the f same diameter and have the same number of teeth and gear 88 drives gear 92. The eccentricity of the sleeve 88 and the sleeve 8| areA the same. The eccentricity of the gears 88 and 92 are likewise the same;

In the position of the parts shown in Figure 4, the eccentriclties are'not apparent because the parts mare shown in what will be later designated as the neutral position' in which the parts are so .positioned that the eccentricities balance each other and under such condition the gears 88 and 82 rotate as fthough they were concentrically mounted on their respective shafts. This neutral condition is also illustrated in Figure 5 which is an elevation of the ends of the shafts 64 and 88. Under this adjustment it will be observed that the greatest eccentricity soto speak, of the gears 88 and 92 is opposite the smallest eccentricity of the sleeves 84 and 88. In thisposition the cutters are vertical and a central line through the cutters passes through the center of the shaft 84.

If the radius of each cutter is for instance 2%, inches and the diameter of the gears 88 and 92 is each 5 inches and each gear is provided with 50 teeth, then it will be apparent that during each rotation of the gear 88, the gear 92 will make one rotation as will likewise the cutters 66 but since in the adjustment assumed the gears- 88 and 92 rotate concentrically in respect to their shafts, the cutters will rotate uniformly during a cycle of the machine or during one rotation of the shaft `84. It is also assumed that the'change gear 48,

Figure 1, on the pinch bar shaft 34 also carries `50 teeth. Such is the normal or neutral adjustment depicted in Figures 4 and 5.

The eccentric mountings above described serve to cause variations in the speed of rotation of the shaft 84 and thereby cause the 4cutters Ato be purpose. Sincethe shaft 88 does not rotate itsI ,Y

zero point serves as a fixed point for adjustment. The zero point on the shaft 64 is opposite the mid-point of the cutters and serves to indicate .their position.

The graduations on the face of the sleeves 84 and 88 are shown in Figures 5, 6 and 7 and correspond to the number of teeth in different change gears which may be used. The zero point on each sleeve is indicated by a hole into which the projections on a tool 81 may be placed forI moving these sleeves together as will be later d escribed.

With the parts in neutral position, shown in Figures 4 and 5,'it will be assumed that itis desired to make a bag tube section of such length asfto require a. 60 tooth change gear between the pinch bar mechanism and the feed rollers. During the cutting action of the. cutters, therefore, it is necessary that they be speeded up to accord substantially with the surface speed of the paper during the time the cuts are being made. 'I'o adjust theeccentric connections to accomplish this result, the clamps 88, 89, y9| and 88 are loosened. The eccentric sleeve 98 is rotated on the shaft 64 until the'index 88 on the end of the sleeve isopposite the zero on the shaft 84. .The sleeve 84 on the stud shaft 88 isrotated until the index 88 is opposite the zero index 60 thereon coincides with the hole on the v eccentrically mounted sleeve 90 and the clamp 93 tightened. 'I'he gear B0 is then moved out of mesh with the gear 92 and while out of adjustment said gear is turned to such a position l that its index point 60 coincides with the hole Y marking the zero position on the sleeve 09 and the gear put back into mesh with the gear 92. The clamp 89 is then tightened and the machine is ready for operation under the new adjustment.

In order that the gear 88 may be thus unmeshed and remeshed, the sleeve 9| together with the sprocket 'l0 are slidable longitudinally on the shaft 80 but normally are held in position .with the gears 08 and 92 meshing by'reason of an arm 94 carried by a rod 95 slidable in the side frame 2, -the arm 94 engages a circumferential groove 96 in the hub of the sprocket 78. vA collar 98 secures the rod 95 in position, said collar being secured to the rod 95 by a screw |00 when the parts are in the operative position shown in Figure 1.

The relation of the parts, after the adjustment above described has been made, is shown in Figure 6 and it will be understood that during one-half of the rotation of the sleeve 9| due to the eccentric path of the gear 08 more teeth of said gear will engage teeth of the gear 92 than during its remaining one-half of rotation. Consequently during such one half of rotation the gear 92 will be driven at a greater speed than during its remaining one-half of rotation. The posi.

tion of the cutters is such that the cutting action occurs during that half of the rotation of the shaft 64 wherein its motion is accelerated.

Figure 'I shows the adjustment of the parts for a change gear of '15 teeth. There it will be noted the zeroV point on the shafts' and 04 coincides with the index l on the eccentrically mounted sleeves 88 and 90 while the index 15 on the gears 88 and 92 coincides with the holes marking the zero position on the eccentrically mounted sleeves. It will be apparent that the acceleration under the adjustment shown in Figures 6 and 7, of the shaft 60 during the cutting action will be greatest when the cutters are in the position there shown, that is at their central point. The cutters, however, will move somewhat slower at the beginning of their cutting action and somewhat slower, but in the same degree, towards the end of their cuttingaction. In other 'words, the peripheral speed of the cutters at their central point will be exactly the same as the surface speed of the paper but 4the peripheral speed of the cutters at the beginning and end of their cutting action will be slightly less than the surface speed of the web. This difference however, is so slight that it is not material to the making of a proper cut.

It is obvious from what has been said that the eccentrics may be adjusted to positions corresponding to any change gear within the capacity of the machine and indexes may be provided for the various change gears.

The range shown is from a change gear having 35 teeth to a change gear having 75 teeth and th se limits correspond approximately to a bag tux section from eleven inches in length to one of twenty-three inches in length.

Since the cutters have edges of suiiicient length aromas to make the longest cut which the machine may be called uponl to make, means are also provided that shorter cuts may be made in order that the closing iiap of the bag may have different lengths.

- For instance, the closing flap shown in Figure 9 is considerably longer than that shown in Figure l1. Figures 10 and 12 also show bag tube sections in which the upper or closing ap is of a diierent length.

In order to vary the length of cut the shaft 'It carries a hardened roller |02. This shaft carries a gear |03 at its right hand end, Figure 4, which meshes with a similar gear |04 on shaft 0d so that the two shafts are driven in a one to one ratio. 'I'he roller 02 is rotarily adjustable on the shaft 18 by means of a clamp |06. The roller |02 has its peripheral portion of different radii and during the time that the dies are in cooperation with the portion of longer radius the dies are in position to make the cuts. By reference to Figure 2, it will be noted that the web does not pass in a straight line between the idlers i4 and IB, but is raised slightly by the roller |02 when its larger radius part is 'in engagement with the web. When, however, the portion of the roller |02 of less radius is opposite the die there is no cutting action because the web then passes between the rollers I4 and I6 in a line which is slightly below the cutting edge of the cutters. The cutters of course are very accurately ground so that they `ust touch the roller |02 at that portion of its periphery having the greater radius. By adjusting the roller |02 about the shaft 18 the length of cut which the dies will make may be carefully determined so that a cut short enough to make a bag ap of 'a length shown in Figures 10 and l1 as well as longer cuts to make the length flap shown in Figures 9 and 12 are possible.

What I claim is:

1. A bag machine having a former about which a web of paper is wrapped to form a bag tube, with means for continuously advancing the tube and Web; in combination, cutters for making cuts in the web at bag section intervals apart, means for `rotating said cutters, said rotating means induring a rotation, and means whereby the degree of eccentricity may be varied.

3. A bag machine having a former about which a web of paper is wrapped to form a bag tube, with means for continuously advancing the tube and web; in combination, cutters for making cuts in the web at bag section intervals apart, means for rotating said cutters, said rotating means including two gears each gear being so mounted that it may be made to describe an eccentric path during a rotation, and means whereby the degree of eccentricity of each gear may vary in equal and opposite degree.

4. A bag machine having a former about which a web of paper is wrapped to form a bag tube, with means for continuously advancing the tube and web; in combination,cutters for making cuts in 75 the web at bag section intervals apart, means for rotating said cutterasaid rotating means including two gears each gear being so mounted that it may be made to describean eccentric path dur-v ing a. rotation, and means whereby the degree 'of' eccentricity of each gear maybe varied in equal and oppositeI degree, the degree of eccentricity having a denite relation to the surface speed of the web. 4

5.. A bag machine having a former` about which I GEORGE W. PUPPE. m

Images