US619150A

US619150A - dreyfuss

Info

Publication number: US619150A
Authority: US
Publication date: 1899-02-07
Anticipated expiration: 1916-02-07

Description

3 Sheets-Sheat l,

A TTORNEYS.

Paitented Feb. 7, I899.

i. DREYFUSS'.

PAPER CUT-OFF FDR BOX COVERING MACHINES.

(Application filed June 25, 1898.)

YHE uanms warms m, Puma-Lima. wssmuaron. n. c.

(No MudeL) N0. 619,!50. Patented Feb. 7, I899.

l. DREYFUSS.

PAPER CUT-OFF FOB BOX COVERING MACHINES.

(Application filed June 25, 1898.)

:3 3 Swag-Sheets.

(No Model.)

//v VENTOI? 7 A TTORNE 78.

ms Noam: Farms co, wwoumo" WASNINGYOM n n No. 6l9,l50. Patented Fab. 7, 1899. l. DBEYFUSS. PAPERDU-T-OFF FOB BOX GOVERING MACHINES.

(Application filed June 25, 1898.)

IN VENTOH 3 SheetsSheet 3.

(No Model.)

A TTOHNE Y S.

UNTTED STATES PATENT OFFICE.

isrnoannnvruss, on NEW YORK, N. Y.

PAPER CUT-OFF FOR BOX-COVERING MACHINES.

SPECIFICATION forming part of Letters Patent N0. 619,150, dated February 7, 1899.

Application filed June 25. 1898. Serial No. 684,447. (No model.)

To all whom it may concern.-

Be it known that I, ISIDOR DREYFUSS, of the city of New York, borough of Manhattan, in the county of New York and State of New York, have invented a new and Improved Automatic Paper Cut-OE for Box-Covering Machines, of which the following is a full, clear, and eXact description.

The object of my invention is to provide an improved cutoff for paper-boX-covering machines which will be automatic in its action and yet capable of operation by hand.

A further object of the invention is to provide a means whereby the attachment may be adjusted to boxes of various sizes and whereby such adjustment may be made by any person of ordinary intelligence and in an expeditious and convenient manner.

It is a further object of the invention to provide a means whereby there will be the least possible friction in the operation of the knives and to-so construct the knife-operating mechanism that the knives will act with a shear out, one of the knives having a rocking movement and the other a reciprocating movement, the knife havinga rocking movement being capable of operation to meet the cutting edge of the reciprocating knife as the latter descends and leaving the reciprocating knife just prior to its ascent, so that on the ascent of the reciprocating knife the lower knife will ofier no resistance.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the upper right-hand portion of the machine, showing the application of the attachment thereto. Fig. 2 is a plan view of that portion of the attachment and that portion of the machine shown in Fig. 1. Fig. 3 is a vertical section taken substantially on the line 3 3 of Fig. 2, near the left-hand end of the attachment, illustrating the knives in their normal posi tion. Fig. 4 is a view similar to Fig. 3, the knives being shown as just having made a cut. Fig. 5 is a detail view of a portion of the stick or rod that operates the knives and a detail sectional view of a dog that is employed in connection with the said stick or rod. Fig. 6 is a vertical section taken through the mechanism at the right-hand end of the knife-shaft, the said section being taken practically on the line 6 6 of Fig. 2. Fig. 7 is a detail outside view of the upper portion of the left-hand end of the attachment. Fig. 8 is a section taken at the same end of the machine substantially on the line 8 8 of Fig. 7. Fig. 9 is a front elevation of the knives and their supports, the knives being in their normal position. Fig. 10 is a section taken substantially on the line 10 10 of Fig. 9, the knives being in the position shown in Fig. 9. Fig. 11 is a section similar to that shown in Fig. 10, the knives being shown in engagement; and Fig. 12 is a vertical section taken practically on the line 12 12 of Figs. 1 and 2.

A represents a portion of the bed of a paper-box-coverin g machine; B, the drive-shaft, that is journaled in suitable hearings in said bed, the bearings of the drive-shaft, which are designated as 11, being provided with a hood 10 about centrally between their ends, as illustrated in Figs. 2 and 12. The shaft B may be driven in any suitable or approved manner. One manner of driving the said shaft is that illustrated in Fig. 12, in which a worm-wheel 13 is secured on the shaft B beneath the housing 10, engaged by a worm 14.,driven by any suitable power. The driveshaft B is made to carryaform 0, upon which the box 0 to be covered is supported; but this form constitutes no portion of the present invention, and the paper 0 is fed from any suitable source of supply between knives, to be hereinafter described, and to the surface of the box 0 that is to be covered.

A rib 15 is formed on the bed A of the machine, and a foot-piece for a standard 17 is mounted to slide on the said rib, so that the standard, which is the prime support for the attachment, may be carried to or from the form for the box to be covered. The standard 17 supports a frame D, and the said frame consists of a right-hand upright side 19, to which, preferably, asleeve 18 is secured, and the said sleeve is fitted to slide upon the standard 17, being held in adjusted position by a set-screw 18 or its equivalent.

The frame are connected near their bottom at the rear of the slots 21 through the medium of a bar 23. This bar is preferably L-shaped in crosssection and near its left-hand end is provided with an opening 24, and just above this opening an adj usting-screw 25 is located in the upper surface of the bar for a purpose to be hereinafter mentioned, and at each end of the connecting-bar an offset or a lug 23 (shown best in Fig. 9) is usually formed.

A knife-supporting bar 26 is located above the connecting-bar 23. This knife-support ing bar 26 is provided at each end with a lug 27, and the lugs 27 of the knife-supporting bar are generally made to engage with the inner faces of the lugs 23 of the connectingbar 23, as shown also in Fig. 9, the lugs on the knife-supporting barbeing pivoted to the lugs on the con nectin g-bar by means of pivotpins or spindles 28. A knife-blade, which is the lower knife-blade of the attachment, is secured in any suitable or approved manner upon the upper surface of the supportingbar 26. The cutting edge of the knife 29 extends forwardly beyond its supporting-bar 26, as shown in Figs. 3 and4, and is given an upward bevel. The cutting edge of the knife 29 at its right-hand end is longitudinally inclined or cut away, as is shown particularly in Figs. 10 and 11.

A shaft 31 is journaled in the rearwardlyextending arms 22 of the side pieces of the frame D, the shaft being carried beyond the sides of the frame to a greater extent at the right-hand than at the left-hand side. Two arms 32 are secured to the shaft 31 within the frame D near its sides. A longitudinal slot 33 is made in the forward end of each of the said arms 32, as shown best invFigs. 3 and 4, and these arms are adapted to carry the supporting-bar 34 for the upper knife 34. The supporting-bar 34 is preferably L- shaped in cross-section, and the upper knife 34': is secured to its under face, the knife-blade being given a downward and rearward inclination, and its rear longitudinal edge is the cutting edge. wardly, or in a reverse direction to the cutting edge of the lower knife 29. I

Ahanger 35 is attached to or made integral with the upper edge of the supporting-bar of the upper knife at each'of its ends. Each of these hangers is provided with two members, especially at thetop; but the hanger at the left-hand end of the upper knife is shorter than the hanger at the right-hand end of the V U l The said cutting edge is beveled downsame knife, so that the upper cutting-blade is longitudinally inclined, being in its normal position nearer the right-hand end of the lowerblade or knife than the left-hand end. Each hanger receives between its members the slotted end of one of the said arms 32, attached to the shaft 31, and the pivot-pin 36 is passed through the top of each hanger and through the slot in the arm pertaining to the hanger and preferably at each end of the upper-knife-supporting bar, and at the outer face of each hanger lugs 37 are formed, which en ter and are adapted to slide in the slots 21 made in the sides of the frame D.

In order that friction shall be reduced to a minimum where the arms 32 connect with the upper-knife-supporting bar, a frictionroller 38 is preferably placed upon each pivotpin 36, the friction-rollers being held to travel in the slots 33 of the said arms 32, as shown in Figs. 3 and 4.

A plunger-head 40 is located at the outer face of the left-hand side bar of the frame D, the plunger-head being provided with a 1ongitudinal or vertical slot 41, through which the shaft 31 is loosely passed. The plungerhead 40 is provided with a rearwardly-extending block 39, in which block a latch 42 is held to slide parallel with the shaft 31, the head of the latch, which is beveled, extending out beyond the outer side face of the block, as shown in Figs. 7 and 8, the latch being attached to a spring-arm 43, which is secured to the inner side face of the said block 39, as is most clearly shown in Fig. 8. This spring serves to normally hold the head of the latch beyond the outer side face of the block.

A rod 44 is secured to the lower face of the plunger-head 40, and this rod is made to pass freely through an arm 45, located at the rear of the left-hand side of the frame D, which arm 45 at its inner end is attached to an arm 46, and the arm 46 is carried through the opening 24 in the connecting-bar 23 of the frame, as shown in Figs. 3 and 4, to a connection with the supporting-bar of the lower knife, the arm 46 being likewise passed immediately below the adj listing-screw 25,which screw limits the upward movement of the arm 46 and the forward rocking movement of the lower-knife 29, since when the connected arms 45 and 46 are elevated the lower knife is rocked forward, and as the said arms are depressed the lower knife will be carried rearwardly. A nut 47 is secured on the plunger-rod 44 just above the arm 45, through which the rod passes, and in the normal position of the plunger-rod andits guide-arm the nut 47, which may be a collar, will be in I engagement with the said guide-arm. The

spring 49 is coiled around that portion of the plunger-rod 44 which is below the guide-arm 45, the spring having hearing at its upper end against the under face of the said arm and at its lower end against a head 48 formed at the lower end of the said plunger-rod.

The plunger-head and its rod are raised through the medium of a collar 50, which is secured upon the left-hand end of the shaft 31 through the medium of a set-screw 51 or its equivalent, and the collar 50 is provided with a rearwardly-projecting lug 52, which as the shaft revolves will be in the path of the projecting end of the rod 42, carried by the plunger-head.

A spring 53 is coiled around the shaft 31 near its right-hand end, and the said spring is atorsion-spring, being contracted when the shaft is turned in one direction and serving to return the shaft to its normal position when the latch is disconnected from the projection of the collar 50. This spring 53 has one of its ends attached to a collar 54, which is faston the shaft 30, the other end of the spring being secured to the rear extension 55 from one of the right-hand supporting-arms 32. The attachment of the ends of the spring is best shown in Fig. 2, where the ends are designated as CL and a.

In the operation of the knives, the knives being in their normal position, (shown in Fig. 9,) if the shaft 31 is turned by suitable mechanism in a manner to place the spring 53 under tension the arms of the upper knife will be carried downward, and as the shaft turns to effect this movement of the upper or reciprocating knife the projection 52 on the collar 50, attached to the shaft at its left-hand end, by engagement with the head of the latch 42 will carry the plunger-head and plungerrod and 44 upward, placing the spring 49 of the plunger under tension and causing the guide-arms 45 and 46 for the plunger-rod to be raised, thus rocking'the lower knife forward, and at about the time the cutting edge of the upper knife at the right-hand end reaches the corresponding end of the cuttingsurface of the lower knife the lower knife will have been advanced sufficiently to bring its cutting edge in engagement with the cutting edge of the upper or reciprocating knife; but as the upper knife will first strike at its lower or right-hand end the beveled surface 30 of the lower knife the lower knife will be graduallypushed rearward against the tension of the spring 49 and the upper knife will cut the paper with a perfect shear out. As soon as the cutting action is effected between the two knives the projection of the collar 50 will have passed the latch 42, and the spring 49 of the plunger-rod will then immediately act to rock the lower knife rearward, so that the upper knife when it ascends will not be in frictional engagement with the lower knife, since a space will in tervene the two knives, as shown in Fig. 10. The upper knife will ascend as soon as the shaft 31 is relieved from driving action, the upper knife being returned by the torsionspring 53 in assuming its normal position.

The upper knife may be operated by hand at any time, since the mechanism employed for driving the shaft 30, to be hereinafter described, will not act upon the shaft 31 after the out has been made until it is intended that such mechanism shall be brought into action, and through the medium of such mechanism the action of the machine is rendered automatic.

The driving mechanism for the knife above referred to is shown best in Figs. 1, 2, 5, and 9 and is as follows: At the right-hand end of the shaft 31 a sleeve 56 is securely fastened by means of a set-screw or otherwise, and the said sleeve is provided with a projection 56, as shown in Fig. 9, which extends downward, and with a horizontal arm 57 from the said projection, which is carried beneath the shaft parallel therewith. A second sleeve 58 is loosely mounted on the shaft 31, and this second sleeve 58 is provided with a forked spur 59, which straddles the forward surface of the arm 57 of the fixed sleeve 56, and a rear projection 60 from the loose sleeve 58 is made to slide in a slot 61 produced in a bar 62, the said bar being verticallyadj usted on the loose sleeve 58 by means of a set-screw 63 or the equivalent thereof The lower end of the bar 62 is bifurcated and provided with eyes 64, in which eyes a cylindrical block 65 is mounted to turn, and at one end of this cylindrical block a set-screw 66 is located, which extends through into a slot made in the central portion of the cylindrical block, through which slot the upper end of a stick or bar 67 is passed, the stick or bar being adapted to actuate the shaft 31. The throw of the shaft 31 is regulated by the adjustment of the stick and actuating-bar 67 in the cylindrical block 65, which is accomplished by the manipulation of the set-screw 66.

The actuating stick or bar 67 is provided near its lower end with a notch 68 in its lower face. The hub 70 of a support 71 is mounted to turn upon the sleeve projection 12 of the bearing 11 for the main shaft B, as shown in Fig. 12. This support 71 is in the nature of a plate or a casting and, as shown, is oblong and provided at its top, near its rear end, with an upright 72, provided with a bearing 73, and at its forward end with an upright 74, having a bearing 75 formed thereon, and the forward and lower end of the actuating stick or bar 67 is mounted to slide loosely in the said bearings 73 and 75. An adjusting-screw 76 is located in the rear upright 74 of the supportingplate 71, the working end of the said set screw extending to the rearward, as shown particularly in Fig. 1, and at the lower portion of the rear end of the supporting-plate 71 an eye 77 is located. The downward and forward movement of the agitating-bar (i7 is limited by a pin 78, which when the stick has been carried as far forward as is needed engages with the rear upright- 72 of the supporting-plate 71.

The supporting-plate is provided at its rear end usually with a neck 79, (shown in Fig. 2,) and from the said neck a guide-lug S0 is carried outward. A propelling device is provided for the actuating stickor rod 67. This of a plate or. a casting and is held to slide upon the supporting-plate 71 in engagement with the outer face of the said supportingplate, being guided in its movement on said supporting-plate to some extent by the hub 70 of the supporting-plate passing through a longitudinal opening 82 in the propellingplate, the hub fitting loosely in the said opening. The propelling-plate is provided at its forward end portion with an offset 82 in which offset a friction-roller 83 is preferably journaled, and a guide-rod 84 is carried forwardfrom the offset 82 and'through the eye 77 of the supporting-plate 71. When the propelling-plate 81 has been carried as far to the front as is necessary, the offset 82 will engage with the eye 87, as shown in positive linesin Fig. 1, the dotted lines showing the rearwardjor normalposition of the said propelling-plate.

The propelling-plate is provided with arearwardly-extending neck 85, having an outwardly-projecting lug 86, and in this lug one end of a rod 87 is secured, a washer 88 being placed upon the said rod adjacent to the said lug, as is also shown in Fig. 1. The rod 87 is-passed loosely through a projection 80 from the rear portion of the propelling-plate. A spring 89 is coiled around the said rod at its rear end, having bearing against the projection 80 from the supporting-plate and against a head 90, formed at the rear end of the rod. When the propelling-plate is carried to its forward position, the spring 89 is placed under tension.

An upwardlyextending standard 91 is formed at the rear upper portion of the propelling-plate, and upon the inner face of this standard, above the upper edge of the supporting-plate 71, a dog 92 is pivoted .to the standard 91, as shown best inFigs. 1 and 5. The dog 92 is provided with ahead 93, which extends beyond the plane of its outer face.

The said head is pointed and is adapted to enter the slot 68 in the agitating rod or stick "67. The head 93 of the dog at its offset pormechanism for the knives, supposing the propelling-plate 81 to be in the dotted position shown in Fig. 1, the other portions of the device being in the position shown in positive lines, with the exception of the cam, as the cam revolves the nose of the said cam will engage with the roller in the ofiset 82 of the propelling-plate and will gradually force the propelling-plate. forward, and when the propelling-plate has reached its forward position (shown in positive lines in Fig. 1) the dog will have been engaged by theset-screw 76 and will have been drawn upward, the latch 96 entering the rearmost cavity 95 in the head of the latch, thus carrying the head of the latch into the notch or recess 68 in the actuating stick or rod" 67. The spring 89, connected with the propelling-plate, will now the nose of the cam disengages from the roller of the ofiset' 82 of the propelling-plate the spring 89 will expand and will quickly draw rearward, and the said sleeve engaging with the projecting arm 57 of the collar '56, secured to the shaft 31, will turn the said shaft in a direction to place its spring 53 under tension and carry the reciprocating knife downward,- at the same time operating the lowerorlrocking knife. The momentum of the stick in its rearward passage will cause the notch to pass the dog when the propelling-plate be.- comes stationary, and the said dog will then gravitate downward to the dotted position shown in Fig. 1, and the latch 96 will enter the forward cavity 94, holding the dog out of the path of the stick and permitting the spring 53 on the shaft 31 to return the knives and the stick to their initial or normal position.

Having thus described my. invention, I

'- claim as new and desire to secure by Letters Paten.t-

1. In a cut-off attachment for. box-covering machines, a frame, a knife mounted to rock in said frame, a second knife adapted to re ciprocate within the frame, having movement to and from the rocking knife, and means, substantially as described, for moving the rocking knife to and from the reciprocating knife respectively on the down and the up stroke of said reciprocating knife, the two knives being located one above the other, the space between the knives tapering in shape when the knives are in their normal position.

2. In a paper cut-0E for box-covering machines, a vertically reciprocating knife, a guide for the ends of the reciprocating knife, a knife mounted to rock below the reciproeating knife, the rocking knife being capable of horizontal movement to and from the reciprocating knife, the reciprocating knife in .its various positionsbeing longitudinally at an angle to the rocking knife, the rocking knife having its cutting edge longitudinally beveled at thepoint where the reciprocating knife most closely approaches the rocking knife, and the movement of the reciprocating knife being at an angle to the rocking knife in each position of the reciprocating knife, as described, whereby a shear cutbetween the two knives is obtained, while the reciprocating knife is guided at each of its ends, as described.

have been placed under tension,and as soon as 3. In a paper cut-off for box-covering machines, a horizontal tension-controlled rocking knife and a longitudinally-inclined reciprocating knife, hangers for the reciprocating knife capable of movement to and from the rocking knife, a pivotal support for the said hangers, and an actuating connection between the pivotal support for the hangers of the reciprocating knife and the tension device for the rocking knife, as and for the purpose specified.

4. In a paper cut-off for box-covering machines, a frame, a knife mounted to rock in the said frame, a reciprocating knife mounted to slide in the said frame to and from the rocking knife, the reciprocating knife being longitudinally inclined with relation to the rocking knife, a tensioncontrolled device adapted to impart rocking movement to the rocking knife, means for suspending the reciprocating knife, a rotary support for the suspension attachment to the reciprocating knife, and a connection between the said rotary support for the reciprocating knife and the tension attachment for the rocking knife, the connection being such that at the downward movement of the reciprocating knife the rocking knife will approach it and will leave the reciprocating knife prior to its return movement, as specified.

5. In a paper cut-01f for box-covering machines, the combination, with aframe, aknife mounted to rock in the said frame, an arm connected with the rocking knife, a shaft, means for rotating the said shaft, a plunger carried by the said shaft and having vertical movement thereon, and a spring connection with the arm connected with the rocking knife, and a lifting connection between the said shaft and the said plunger, of arms secured to the said shaft, a knife the support whereof has vertical movement in the said frame, the said vertically-moving knife being longitudinally at an angle to the rocking knife, and arms connected with the said shaft and with the support for the reciprocating knife, substantially as shown and described.

6. In a paper cut-0E for box-covering machines, the combination, with a frame, a knife mounted to rock in the said frame, an arm connected with the rocking knife, a shaft, means for rotating said shaft, a plunger carried by said shaft and having vertical movement thereon, and a spring connection with the arm connected with the rocking knife, and a lifting connection between the said shaft and said plunger, of arms secured to the said shaft, a knife the support whereof has vertical movement in the said frame, the said vertically-moving knife being longitudinally at an angle to the rocking knife, hangers connected with the support for the reciprocating knife, arms attached to the said shaft, pivoted in the said hangers, the said arms at their pivot-point being provided with longitudinal slots, and friction-rollers carried by the pivots of the arms, the said rollers being held to nection with the said arms, the plunger being held to slide vertically on the said shaft, the plunger being provided with a spring-controlled latch, and a projection from the said shaft located in the path of the said latch, of an upper knife, longitudinally inclined with respect to the lower or rocking knife, a support for the upper knife, hangers attached to the said support, guides from the upper-knife support, held to travel in vertical slots in the side portions of the said frame, and arms connected with the said hangers and with the said shaft, for the purpose specified.

8. In a paper cut-off for box-coveringmachines, a frame, an inclined knife mounted to reciprocate in said frame, a tension-controlled rocking knife adapted to mate with the reciprocating knife, meeting the same at an angle, the reciprocating knife being guided at both of its ends, and the rocking knife being provided with a longitudinal bevel at its cutting edge opposite the lowest point of the reciprocating inclined knife, and means, substantially as described, for carrying the rocking knife toward the reciprocating knife on the downward stroke of the latter, and from the reciprocating knife upon its upward stroke, for the purpose set forth.

9. In a paper cut-01f for box-covering machines, a rocking and a reciprocating knife, a shaft controlling the movement of the two knives, a drive-shaft, a cam carried by the drive-shaft, a pivoted support, an actuatingstick held to slide in the pivoted support and having an attachment to the actuating-shaft of the knives, a plate guided by the said pivoted support, the said plate being actuated by the said cam, and a dog carried by the cam actuated plate, which dog is adapted for engagement with the said actuating-stick, for the purpose set forth.

10. In a paper cut-off forboX-covering machines, the combination, with a shaft adapted to operate knives, the said shaft being provided with a torsion-spring, of a drive-shaft, a plate pivotally mounted on the said driveshaft, an actuating-stick having guided movement in the said pivoted plate, a rocking attachment between the said stick and the actuating-shaft for the knives, a propelling-plate having guided movement upon the pivotal plate and provided with a dog adapted to entera recess in the said actuating stick, a shifting device for the dog carried by the pivotal plate, and a cam carried by the main shaft, being arranged to actuate the propelling-plate, which plate is spring-controlled, for the purpose specified.

11. In a paper cut-off for box coveringmachines, the combination, with the main frame of the machine, an auxiliary frame vertically and laterally adjustable upon the main frame, knives carried by the auxiliary frame, and a spring-controlled shaft having operative con- 'nection with the said knives, of a main shaft, a supporting-plate pivoted at the main shaft, an actuating-stick having guided movement in the said pivoted support, the actuatingstick being provided with a recess in one of its edges, a plate adjustably attached to the said stick, and means for turning the knifeactuating shaft by the movement of the said plate connected with the stick, a spring-controlled propelling-plate having guided movement upon the pivoted supporting-plate, a dog carried by the propelling-plate, a trip for the said dog carried by the supporting-plate, and a cam carried by the main shaft, and arranged for actuating connection with the propelling-plate, for the purpose set forth.

12. In a paper cut-off for box-covering machines, the combination, with the main frame of. the machine, an auxiliary frame'vertically and laterally adjustable upon the main frame, knives carried by the auxiliary frame, and a spring-con trolled shaft having operative connection with the said knives, of a main shaft, a supporting-plate pivoted at the main shaft,

anactuating-stick having guided movement in the said pivoted support, the actuatingstick being provided with a recess in one of its edges, a plate adj ustably attached to the said stick, and means for turning the knife- :actuating shaft by the movement of the said plate connected with the stick, a spring-controlled propelling-plate having guided movement upon the pivoted supporting-plate, a

dog carried by the propelling-plate, a trip for the said dog carried by the supporting-plate,

a cam carried by the main shaft and arranged for actuating connection with'the propelling- 13. In a paper cut-off for box-covering machines, the combination, with opposing uprights, a tension-controlled.knife mounted to rock between the said uprights, and a reciprocating knife having its ends guided in the upright, the reciprocating knife being arranged ;to move to and from the rocking knife, the reciprocating knife being so inclined that gone of its ends more closely approaches the ,rocking knife than its opposite end, the cutting edge of the reciprocating knife being arranged to meet the cutting edge of the rock- Zing knife and gradually force the rocking Qknife to a position Which will enable the two ,knives to efiect a shear cut, as set forth.

ISIDOR DREYFU SS.