US2731890A - bechle - Google Patents

Description

Jan. 24, 1956 R. P. BECHLE 2,731,890

WEB SLITTING AND CROSS PASTING APPARATUS Filed March 25, 1952 4 Sheets-Sheet 1 FIG. I

INVENTOR. RUDOLPH P BECHLE z gm 1956 R. P. BECHLE WEB SLITTING AND CROSS PASTING APPARATUS Sheets-Sheet 2 Filed March 25, 1952 INVENTOR. RUDOLPH P BECHLE W 1956 R. P. BECHLE WEB SLITTING AND CROSS PASTING APPARATUS 4 SheetsSheet 3 Filed March 25, 1952 JNVENTOR. P BECHLE BY RUDOLPH Jan. 24, 1956 R. P. BECHLE 2,731,890-

WEB SLITTING AND CROSS PASTING APPARATUS Filed March 25, 1952 FIGS 4 Sheets-Sheet 4 INVENTOR.

RUDOLPH P BECHLE Y a shingled effect.

c r 2,731,890 WEB SLITTVING AND- cRoss PASTING APPARATUS Rudolph-P. Bechle, Yonkers, N. Y., assignor to Potdevin Machine Company, Teterhoro, N. L, a corporation of New York Application March 25, 1952, set-in No. 278,520 4 Claims. (21. 93-8) My invention relates to an improvement in web slitting, and cross pastingmechanisms, and has for one of its objects to provide such mechanism which is economi cal, convenient and easy to adjust so as to adapt the samefor use in the web slitting and cross pasting of multiple wall satchel bottom and self-opening paper bags.

, Conventional bottoms formed on satchel bottom and form bottoms with sufiicient paste area and also so as to prevent the extreme inflexibility that results from the full angular fold.

The formation of a proper bottom is dependent upon the location and length of the slits.

It is essential therefore for optimum bottom-forming conditions that the slits be adjustable by the It is equally essential that the slitting mechanism be laterally and longitudinally of the web.

On multiple-wall bags it is considered advantageous, to reduce sifting, to stagger the slits in order to obtain In this Way a double seal is provided and the multiple bottom unduly. Staggered slits require that the slitting be done to both Webs separately, that is before the ,Webs are brought together and formed into a tube, but the relationship or relative location of these separate operations must be closely controlled and maintained.

I have found that the rotary shear principle of slitting is ideal for my slitting operation, in that I obtain walls are prevented from stifiening the clean cuts which are very consistent in location and' length, all of which is very desirable in the modern high speed automatic machines employed in the making of bags.

My invention provides an apparatusin which the slithas been made whereby paper speed and slitter speed The bag machines with which I am concerned are multi-size, that is, are capable of making bagsin a variety of sizes, so that the web length between slits varies and the paper feed per revolution of the slitters also varies.

7 Prior to my invention the practice has been to employ knives and holders of proper diameter to match the circumference of revolution to the cut-off length of the bag in question. This has the obvious disadvantage of requiring a multiplicity of holders and knives for diiferent bag lengths not to mention the time necessarily spent removing, installing, readjusting and ,retiming all of the components.

Furthermore provision must be made in the basic machine to accommodate this multiplicity of diameters with the attendant complication of drives, adjustments, etc.

The same problems to a somewhat lesser degree are involved in the cross pasting.

In my improved apparatus wherein the cutters pasters are of fixed diameter, I accommodate the equipment to the making of bags of varying 'sizes by impart- 2,731,890 Patented Jan. 24, 1956 inga pulsating cyclic motion to the slitters and pasters, thespee'd of the slitte-rs varying from to and back to maximum on each revolution. degree of speed variation from maximum to minimum is adjustable and is set so that at the maximmnjdrf minimum speed it is just sufficient to match the fixed diameter mechanisms to paper speed. The setting is such that pasting and slitting both take place at thesame ii)- I maximum or minimum point of the cycle. In; my improved apparatus one web is slitted and cross other is slittd the two webs then becombining the two webs to he'eqtial to the distance from the point of combination of the two webs to the cross paster of the other web. This eliminates the necss'ity of adjusting the relative timing of these components when bag-siz'e'sare changed.

Since cross pasting and slitting of the web must take place simultaneously because the speed is correct at only one pointof the cycle, the web lead from the slitter to the crosspaster must necessarily be an integralnumber of 'cut oil lengths. Accordingly in order that provision 'be' made to accommodate the machine to varying bag lengths I provide simple adjusting mchariism for this purpose: The slitting mechanism 7 essentially involves slitter shafts and anvil shafts, and the lateral adjusting mechashafts are adjusted V 7 v shear relationship between the cutting edge. 1 For the cyclic drive for the slitters and cross past'er I employ a crank motion althoughelli'ptic gears could be used but not to as good an advantage.

In the accompanying drawings wherein I have illustrated an embodiment of my invention. H more or less diagrammatic fragmentary view of the two webs of a multi wall bag illustrating primarilythe relative location of the web slits, cross pasting andcut-ofl"; g M i In p V Fig. 2 is apart sectional view illustrating the layout of the s litters and cross paster, etc c j j 1 v Fig. 3 isa top plan view in part section of the cyclic drive mechanism; I I J Fig. 4 is an end view of the same; I Fig. 5 is a fragmentary plan view in part section of the lateral adjusting mechanism for the slitting mechanism; and

Fig. 6 is an end elevation of the same. I g Refeningtto Fig. 1 of the drawings, -2 a'nd {designate two paper webs which are to he slitted, cross pasted, combined eventually formed into multiwall bags.

These webs arebeing continuouslyadvanced, and the slitting, cross-pasting, etc. take place while the web'sjare moving.

In Fig. 1', the slits 6, the cross pasting 8 in the web 2 have been designated is applied to the web 2 only. The slits in the Web 4 are designated 10. After the slitting and cross pasting operations the two webs are combined, and in alater operation, are cut into bag lengths. In order that the relation of the division of the webs into bag lengthsto the location of the slots and cross pasting be illustrated, I have shown the transverse lines 12 on Fig. 1 as indicating the point of out 01f.

Referring now to Fig. 2 of the, drawings, the Web 2 is taken from any suitable supply roll and is drawn through the machine in conventional fashion, it being home in mind that, as is customary in bag making machines, the web is continuously moving 'at constant speed, In accordancejwith 'my'invention the web as it comes into the machine passes around an idler roller 14 and from "thence upwardly around "anvil roller 16 which is simply driven slits in one web to be staggered by the moving web. The web is then passed about idler rollers 18 and 20 to the cross pasting backing roller 22, idler roller 24, to pasting roller 26, whereby paste is applied longitudinally of the web, and where in fact the two web'2 and 4 are brought together or combined. This area will be referred to hereinafter as the combining station.

. The web 4 is taken from any suitable supply roll and as it is drawn forward continuously it passes over idlers 28 and 30 and from thence about anvil roller 32, simply driven by the moving web, and then around idler roller 34 to the combining station. 7

While the two webs are moving forward at equal speed at all times they are travelling in separate paths to apoint at least beyond the slitting and cross pasting stations.

The two webs after being slitted and cross pasted, etc., are divided into bag lengths at 36.

As above explained the slitting and cross pasting of the web 2 are done simultaneously. Likewise as above pointed out these two operations are performed at paper speed. The means for accomplishing this will be described later in this description. v

Inasmuch as the slitting and cross pasting of the web take place simultaneously, and inasmuch as the location of the" slits and cross pasting of the web 2 has a definite relation to the area at which the webs are divided into bag lengths as shown in Fig. 1, it becomes necessary to provide some means whereby this relationship will be maintained when the spacing of division into bag lengths is altered to produce bag lengths of different lengths. I accordingly have provided for varying the length of lead or web between the anvil roller 16 and the cross pasting backing roller 22. As seen from Fig. 2 the web after it leaves anvil roller 16 passes about rollers 18 and 20 to the cross pasting backing roller 22, so that the web is in effect looped about 18. The shaft 38 of this roller, and on which the roller is rotatable, is provided at each end witha pinion 40 meshing with vertically extending racks 42. By rotating the shaft 38 by a handwheel, for instance, the roller 18 can be raised and lowered, thereby to vary the length of web between 16 and 22. V

The cross paster is designated 42 and its cooperating tank roller is designated 44. The web 2 passes about the roller 22 which has been referred to as the backing roller for the cross paster 42 inasmuch as the cross paste is applied as the paster 42 is rotated past 22.

The slitters for the web 2 I have referred to as comprising an anvil roller 16 and a cooperating slitter roller, which in Fig. 2 I have designated 44.

The anvil roller 16 is provided with peripheral circumferential grooves 46, spaced at the desired intervals along the roller which depends upon the spacing of the slits 6 transversely of the web; Theslitting knives 48 carried by 4.4 are similarly'spaced so that, with the two rollers r0 tating, the web as it passes between them will be slit with 'a shear cut. The anvil roller. 32 and its cooperating slitter roller 50 for the upper web 4 are of similar construction.

Referring now to Figs.

it is necessary that each pair of anvil and slitter rollers be adjustable laterally of the web, and that one pair be adjustable relative to the other. This not only accommodates the machine to webs of different widths, but it enables the to any extent desired with respect to the slits in the other web. As above pointed out this staggering of the slits is desirable and of material advantage. In Figs. 5 and 6 I have shown the upper set of anvil and slitter rollers only, but it is to be under'stoodthat the lower set is similar in construction. Each of the members 32 and 50 at one end extends into and is rotatable relatively to an exteriorly threaded sleeve 52, these'sleeves being threaded through the side frame 54 of the. machine. Each sleeve 52 carries a gear 56 and these gears are in constant mesh with a wide faced gear 58 adapted to be manuallyi rotated by knob 60. By rotating this knob it will be apparent that both the anvil roller and the slitter roller maybe adjusted simultaneously laterally of the machine 5 and 6. As above pointed out I and web. Inasmuch as the adjusting mechanism for the lower set of anvil and slitting rollers is a duplicate of that just described, it will be apparent that the two sets of rollers are adjustable relatively to each other.

As above pointed out the slitters and cross paster are given a pulsating cyclic motion. The slitter 44 is geared 1:1 to the slitter 50. Likewise these two rollers are geared 1:1 to the cross paster 42. Inasmuch as the circumferential grooves in each of the anvil rollers are continuous, the anvil rollers need not be driven other'th'an'by the paper web.

Referring to Figs. 3 and 4, the input and output shafts of the cyclic motion mechanism are designated 62 and 64, respectively, the shaft 64 being coupled to or integral with one of the slitter rollers or to the cross paster. 62 operates one revolution per bag and it revolves at a steady or constant rate. This shaft is keyed to gear 66 which is in mesh with a one to one gear 68. Gear 68 revolves on stud 76 which is in turn carried by housing 72. Housing 72 is arranged so that it can limited arc and it is pivoted around the center of shaft 62 and gear 66. The center of gear 68 can be set concentric or at various degrees of eccentricity with respect to output shaft 64. Gear 68 carries driver 74 by meansof stud 76.

Driver 7 4 contacts, by slidable engagement, slide 78 which 7 is in turn carried by and keyed to output shaft 64. 1 Gear 68 revolvesat constant speed in time with input shaft 62 and driver 74 revolves in a circle concentric with gear 68 and with constant circumferential speed. In-

revolving it carries slide 78 along with it. However, if slide 78, and gear 68 are adjusted eccentrically, the lever arm, or radius from the slide center of rotation to the point of engagement with driver 74 varies from a maximum to minimum and back to maximum during the revolution. Since the driver circumferential speed is constant and the lever arm variable, shaft 64 is thereby driven with a variable angular velocity. The amount of speed variation is dependent upon the degree of eccentricity of the adjustable housing the Thus, by proper location maximum and minimum speed of shaft 64 can be controlled by the operator. In the preferred form the housing is equipped with a dial indicating the proper eccentricity for the bag being'run.

It is to be understood that changes may be made in the details of construction and arrangement of parts hereinabove described within the purview of my invention.

What I claim is:

1. In web slitting and cross pasting mechanism, the combination of pairs of slitting and anvil rollers adapted simultaneously to slita plurality of webs moving in spaced paths, a shaft for each of said rollers to which the rollers are afiixed, and means forlaterally shifting each pair of slitting and anvil rollers relatively to the other slitting and anvil rollers, said shifting mechanism comprising an exteriorly threaded sleeve rotatably mounted on the shaft of each anvil and slitter roller, a machine frame through which the said sleeves are threaded, a gear afiixed to each sleeve, an elongated gear meshing with the two last mentioned gears and means manually to rotate the elongated gear thereby-to rotatesaid sleeves to move the slitter roller and anvil roller endwise.

2. In web slitting'and cross pasting mechanism, the.

another web to any extent desired, a rotatable cross paster for cross pasting one web simultaneously with the slitting of the web, driving mechanism for the said slitting'rollers and cross paster to impart to theseelements a pulsating cyclic motion and to drive the slitters at a speed varying from maximum to minimum and back Shaft be moved through a and means for varying the setting of the driving mechanism to vary the maximum and minimum speeds of the slitters.

3. In Web slitting and cross pasting mechanism, the combination of pairs of rotatable slitting and anvil rollers adapted simultaneously to slit a plurality of webs moving in spaced paths, manually operated means for independently adjusting each pair of rollers transversely of the webs to accommodate webs of difiereut widths and to stagger the slits in one web relatively to those in another web to any extent desired, a cross paster for one web for cross pasting the Web simultaneously with the slitting of that web, means located beyond the said slitting and cross pasting mechanisms for uniting the webs to provide a laminated structure, means for adjusting the lead of the cross pasted web between the cross paster and the said uniting means to equal the lead of another web between its slitter and said uniting means, driving mechanism for the slitter rollers and cross paster to impart to these elements a pulsating cyclic motion and to drive the slitters at a speed varying from maximum to minimum and back to maximum on each revolution, and means for varying the setting of the driving mechanism to vary the maximum and minimum speeds of the slitters.

4. In web slitting and cross pasting mechanism, the combination of pairs of rotatable slitting and anvil rollers adapted simultaneously to slit a plurality of webs moving in spaced paths, manually operated means for independently adjusting each pair of rollers laterally of the webs to accommodate webs of difierent widths and to stagger the slits in one web relatively to those in another web to any extent desired, a cross paster for one web for cross pasting the web simultaneously with its slitting, an idler roller between the cross paster and slitter of the Web last mentioned about which the web lead between slitter and cross paster is looped, and rack and pinion mechanism for shifting said idler roller to vary the length of the web loop thereby to vary the spacing of the slitting and cross pasting of the web.

References Cited in the file of this patent UNITED STATES PATENTS

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