US2098413A

US2098413A - Stripping machine

Info

Publication number: US2098413A
Application number: US105924A
Authority: US
Inventors: Daneke Dietrich
Original assignee: FRED M BRACKETT
Current assignee: FRED M BRACKETT
Priority date: 1936-10-16
Filing date: 1936-10-16
Publication date: 1937-11-09
Anticipated expiration: 1954-11-09

Description

Nov. 9, 1937. D. DANEKE 2,093,413

STRIPPING'MACHINE Filed OCb. 16, 1936 i4 Sheets-Sheet l ATTor'zNEY Nov. 9, 1937. D. DANE-KE STRIPPING MACHINE Filed oct. 1e, 195e 4 Sheets-Sheet 2 z O Q Owg ,WMO s V N\ N\\ S .n w Q x m wn @www ATTORNEY Nov, 9, i937. D. DANEKE 2,098,413

STRIPPING MACHINE Filed Oct. 16, 1956 4 Sheets-Sheecl 3 ATTORN EY Nov. 9, 1937.. D. DANEKE 9 STRIPPING MACHINE Filed Oct. 16, 1956 4 Sheets-Sheet 4 ATTOREY INVENTOR /e r BY Patented Nov. 9, 1937 ain STRIPPING MACHINE Dietrich Daneke, Topeka, Kans., assignor to Fred M. Brackett, Topeka, Kans.

Application October 16, 1936, Serial No. 105,924

j 15 Claims.

This invention relates to stripping and similar machines wherewith a strip is applied to individual work-pieces such as tablets, signatures, booklets or the like. In machines of this character the work-pieces are fed through the machine in successive order and the strip is applied thereto in continuous form, the individual work-pieces being subsequently separated by a knife movable through the strip at the points of spacing between the work-pieces. In order that the machine may be operated at maximum capacity it is essential that the spacing between the workpieces be reduced to minimum; however, unless the knife is operated'in exact timed relation with the spacing, the knife cuts into the ends of the work-pieces resulting in damage thereto, and possibly to the knife and its operating mechanism.

It is, therefore, a principal object of the present invention to provide for accurate operation of the knife in exact timed relation with the spacing between the work-pieces and to effect shifting movement of the knife with movement of the work-pieces.

It is also anl important object of the invention to effect automatic operation of the knife incidental to movement of the work-pieces so that the cuts are made in the desired place without consideration as to lengths of the work-pieces.

It is also an important object of the invention to provide a latch mechanism for retaining the knife in inoperative latched position until tripped by a trigger mechanism engageable between the ends of the respective work-pieces.

In accomplishing these and other objects of the invention, as hereinafter pointed out, I have provided improved details of structure, the preferred form of which is illustrated in the accompanying drawings, wherein:

Fig. 1 is a perspective view of a portion of a stripping machine equipped with a knife and knife operating mechanism embodying the features of the present invention.

Fig. 2 is a plan view of the portion of the stripping machine and knife illustrated in Fig. 1, a part of the table being broken away to better illustrate the knife tripping mechanism.

Fig. 3 is a vertical section on the line 3 3 of Fig. 2.

4 is a section on the line 4 4 of Fig. 3 showing the trigger mechanism in tripped position.

Fig. 5 is a similar view showing the tripheld in latched position by the work-pieces.

Fig. 6 is a detail perspective view of the foot for retaining the the trip.

Fig. 'Z is a perspective view of the trip retaining detent.

-Fig. 8 is a cross-sectionv on the line 8 8 of Fig. 2, showing the knife in inoperative position.

Fig. 9 is a similar View showing the knife in operative position.

Fig. 10 is a detail perspective view of the crank mechanism for effecting engagement of the knife operating clutch.

Fig. 11 is a detail section through the trigger and its pivotal support on the line Il II of Fig. 3.

Fig. 12 is a detail perspective view of the parts shown in Fig. 1l in disassembled spaced relation to better illustrate their construction.

Fig. 13 is a longitudinal section through the knife and its operating clutch.

Fig. 14V is a detail section on the line III-I4 of Fig. V13, particularly illustrating the knife stop for holding the knife in inoperative position.

Fig. 15 is a detail perspective View of the knife carrier.

Fig. 16 is a detail perspective view of the knife and its operating parts shown in disassembled spaced relation to better illustrate their construction.

Fig. 17 is a perspective view of the bridge bar.

Referring more in detail to the drawings:

I designates a portion of a stripping machine including a side frame 2 and a table 3. Carried on the outer face of the side frame is a belt 4 cooperating with an. upper belt 5 to move workpieces along the length of the table with the edges thereof projecting from the outer side of the belts, as shown in Fig. 3. The upper belt 5 operates over suitable rollers 6 journalled in side plates 1 and 8 of an upper frame 9, as in conventional stripping machine construction.

The work-pieces I are moved in successive order across the table and have a binding strip I I applied to the edge thereof projecting from between the belts andwhich hasbeen applied as a continuous strip in another part of the machine (not shown). 'I'he work-pieces III are moved in spaced relation as indicated at I2, to provide room for accommodating a knife that severs the strip to separate the work-pieces, as now to be described.

Supported from the side frame 2 adjacent the point at which the strip is to be severed is a bracket I3 carrying spaced bearings I4 and I5 for rotatably mounting a knife operating shaft I6 that extends parallel with and in substantially the work-pieces in engagement with plane of the work-pieces as best shown in Fig. 3, the shaft being spaced laterally from the normal travel of the strip II to accommodate a knife I1 that is rotatable about the axis of the shaft IG and movable across the strip II to separate the individual work-pieces. The knife I1 includes a knife carrier I8 having a hub I9 rotatably mounted on the shaft I6 adjacent the bearing I5. The knife carrier includes an arcuate shaped arm 20 projecting radially from the hub and having a flat face 2I adapted to be contacted with a roller 22 of a control lever 23, later described.

The arm I8 is provided on its opposite face with a recess 24 to mount the knife I1. The knife consists of a flat flexible blade 25 having an arcuate shaped cutting edge 26 positionable in the path of the strip to be severed thereby. The knife is secured against the bottom face 21 of the recess 24 by fastening devices such as screws 28 extending through openings 29 in the arm, registering openings 30 in the knife blade, 3l in a block of rubber 32, and into threaded openings 33 of a retaining bar 34. The knife is thus held in yielding contact against the face 21 incidental to the resiliency of the rubber block 32.

Rotatably mounted on a bearing portion 35 of the hub I9 of the knife carrier is a roller retaining ring 3B having lateral spaced fingers 31 projecting parallel with the axis of the hub to form recesses 38 to accommodate rollers 39, having selective rolling contact with the periphery of the hub and With the inner face 40 of a clutch member 4I. The portions of the hub contacted by the rollers are attened, as indicated at 42, so that when the rollers are retained in the center of the flattened portions the outer peripheries thereof are supported from wedging engagement with theV surface 40 of the clutch member 4I. The clutch member 4I includes an inwardly extending flange 43 that is fixed to a flange 44 on `a sleeve 45 by means of fastening devices, such as rivets 46.

The sleeve 45 includes a portion 41 secured to the shaft by means of tapered pins or the like 48, as best shown in Fig. 13. Also formed as a part of the sleeve is a pulley 49 having a groove 50 in the face thereof mounting a drive belt 5I. The drive pulley (not shown) for the belt 5I is preferably located out of the plane of the pulley 49 in the direction of the knife so that the pull on the belt slides the shaft I6 longitudinally in the direction of the bearing I5 to retain a stop collar 52 on the shaft in engagement therewith as best shown in Fig. 13. When the shaft is in this position an arm 53 on the ring 36 projects through a notch 54 in the Vknife carrier and on the side of the arm in the direction of rotation of the shaft. The arm 53 also engages the head of a plunger 55 that is slidable in a socket 56 formed in a ,plate attached to the bearing I5, as shown in Fig. 1.

The plunger is normally'retained in contact with the arm 53 by a coil spring 51 having one end bearing against the bottom of the socket and its other end against the plunger as shown in Fig. 14. The bottom face .of the notch 54 is provided with a bore 58 having a plunger 59 retained in contact with the arm by means .of a coil spring 60 seated in the .boreand bearing against the plunger, as best shown in Fig. 14. When in this position the roller carrying ring is ,supported Vso that the rollers 38 are centered on the nat sides of the hub and retained from Wedging contact with the inner face of the clutch member 40 so that the knife carrier remains in idle position while the shaft is rotating within the bore of the hub.

In order to selectively release the knife, I provide a tripping mechanism operable incidental to passage of the work-pieces as now to be described. Forrned in the side frame 42.at a. point above the bracket I3, is a substantially cylindrical opening 6I so located that it intersects .the upper edge of the frame at a. point adjacent the side edge of the table, as best shown in Figs. 4 and 5. Fixed to the inner face of the side frame 2 at a .point in alignment with the opening 6I is a. bearing bracket 62 having a bearing opening 63 cooperating with a bearing opening 64 in a side bar 65 that extends longitudinally of the frame 2 in spaced relation therewith at a. pOint below the side plate 1 for mounting a shaft l5.

Fixed on the shaft 66 at the inner side of the bearing bracket 62 is a disk 61 supportingafriction washer engageable with the end flange 69 of a sprocket 19, the sprocket 10 being loosely mounted on .the shaft to rotate independently thereof under certain conditions. Formed on the opposite side of the sprocket is a flange 1I engaging a friction washer 12 yieldingly supportedby a disk 13 that is slidably mounted on the shaft. Fixed on the outer end of the shaft by'a spline 14 is a disk i5 having openings 16 slidably mounting pins 11 projecting laterally from the disk 13. The disk 13 is thus retained in driving relation ,with the disk 15 by the pins and isyieldingly supported in frictional-engagement with the Washer 19 by `means of coil springs 18 sleeved vover the pins and having Vtheir ends bearing Y relatively against the

disks

13 and 15, as shown in Fig. 4. Action -of the springs normally retains the frictional washers in driven relation with the.

sprocket so that operation of the sprocketeifects drive of the shaft G6 through the disks 61,13'and 15, however, the shaft is normally prevented from rotation by means of Va trip mechanism 19.

Fixed on the outer end of theshaft is a crank 39 having a crank pin 8| extending therefrom to pivotally mount the control ,lever 23, previously mentioned. The control lever 23 includes a bar having a depending lower end 83 provided with a slot 94 engaging a pin 85 projecting from the bar G5. The pin 85 has its outer end shouldered, as at V855, to cooperate with a nut 88 on the reduced end thereof to retain the control arm in guided pivotal relation with the crank. The upper end of the control arm carrying the roller projects into alignment with the arm of the knife carrier 22 so that when the crank 80 rotates in an anticlockwise direction (Fig. 8) the knife carrier, including the shaft, is moved laterally toward the bearing I4 to move the arm 59 out of engagement with the head of the plunger 55. When this occurs the spring 60 acts against the plunger 59 to cause relative shifting movementV between the hub of the knife carrier and the roller yretaining ring allowing the rollers 39 to wedgebetween the hub and the inner annular surface V40 .of the clutch member 4I, thereby causing planetation of ther knife to sever the strip II.

In order to insure that the knife is operated directly at the time the space between `the workpieces aligns therewith, I provide the tripping mechanism 19 now to be described. The tripping mechanism 19 includes an arrn99 that is clamped to the shaft by means of a screw 90 extending through ears 9| and 92 as shown in Fig. 11. The

arm 89 has a substantially triangular shaped outer end 93 provided with a slot 94. Pivotally mounted within the slot 94 on a pin 95 is a trip supporting lever 96 carrying a trip 91 that is pivotally retained thereon by a pin 98 extending through ears 99 and |00 of the trip and through an opening in the end of the arm as best shown in Figs. 11 and 12. The trip 91 is of arcuate shape and terminates in forked ends |0| and |92 engaging upon opposite sides o-f a bridge bar |03 that is supported in the plane of the table as best shown in Figs. 2 and 3. The free ends of the trip are rounded to engage under the tablets as shown in Fig. 5. f

In order to relieve pressure of the trip against the bottom of the tablets the side of the trip has a tooth |04 engageable with a shoulder |05 on a lug |06 that is provided on a block |91 that is inset in a groove |08 of the bearing bracket 62, as shown in Fig. 2. The inset block is retained in position by means of a set screw |09 threaded in the side of the bearing bracket and having its end engaging against the insert. When the ends of the trip engage under the tablets the tooth |04 engages the shoulder |05 of the lug |06 as shown in Fig. 4, to prevent rotation of the shaft; however, as soon as one of the spaces I2 aligns with the end of the trip, tendency for the shaft to rotate causes the trip to move upwardly into the space between the tablets a sufficient distance to release the tooth of the trip from engagement with the shoulder. The shaft is, therefore, free to rotate in an anticlockwise direction (Figs. 4 and 5) to cause the rocking movement of the control lever that eifects release of the knife as just described. As soon as the shaft 66 has made one revolution the tooth on the trip reengages the stop shoulder to prevent further rotation thereof until the trip engages another space between the adjacent ends of the succeeding tablets. The trip is normally retained in latched engagement by a spring l0 engaging under the trip supporting lever and in a socket formed in the trip arm 89, as best shown in Fig. 11.

To assure retention of the tablets against the table, the side of the inner bar 8 carries a presser foot ||2 having a slotted forward end |3 to accommodate the ends of the trip when they move through one of the spaces as shown in Fig. 4.

In order to restore the knife to its original position after it has made one revolution, the forward edge of the knife carrying arm is provided with a cam surface ||4 that engages a cam track ||5 formed as a part of a knife guard I6. The knife guard ||6 includes a substantially semicircular housing having a passageway I 1 for the knife as it moves toward the outer side of the machine. To remove any of the adhesive from the knife after it has cut through the trip the guard is provided with a pair of wiping rollers |8 and I9 to contact the knife as it is returned to its rest position.

The knife carrier, after being tripped, is positively shifted in the direction of movement of the work-pieces by engagement of the forward edge |20 of the knife arm with a cam |2| formed as a part of the bearing bracket support. As the knife is returning toward its at rest position, a leaf latch spring |22 rides into engagement with a shoulder |23 on the retractive side of the knife arm to prevent its retractive movement or rebound when it engages the lug on the plunger.

In using an apparatus constructed and assembled as described the Work-pieces I9 are fed along the table 3 between the belts 4 and 5 with the edges thereof carrying the binding strip projecting over the edge of the tableand in the path of the knife. As the tablets move over the trip 91 the trip is held in depressed condition with the tooth |04 thereof in engagement with the shoulder |05 of the lug |06. The shaft 66 is thus retained against rotation; however, due to the slip clutch, the sprocket 10 continues4 to rotate, so that when the trip slides off the retractive end of one of the work-pieces and engages in the space I2 therebetween to release the tooth |04, the sprocket is in condition for driving the shaft66.

Rotation of the shaft 66 actuates the eccentric 89 to cause lateral shifting movement of the roller 22 to shift the knife carrier and its driving assembly in the direction of travel of the work-pieces and in opposition to pull of the belt 5|. This shifting movement of the knife assembly causes ther knife arm to ride laterally off the stop 53. When this occurs the knife carrier is free to rotate and the roller 39 will therefore be wedged in driving relation with the inner face 40 of the clutch member 4|. The` knife carrier will then be positively driven to carry the knife across the space between the respective Work pieces for severing the binding strip. As the knife moves through the binding strip the fore edge |29 of the knife carrier engages against the cam |2| formed as a part of the bearing supporting post |5 so that the knife is rshifted in the same relative position as the movement of the work pieces to effect a perpendicular cut through the binding strip and avoid strikingthe ends of the work-pieces. f

As the knife completes its rotation the cam 4 engages the cam track ||5 to effect lateral shifting movement of the knife assembly and its shaft in a reverse direction until the knife carrier arm is in alignment with the plunger 55 whereupon the plunger 59 strikes the arm 53 thereby stopping rotation of the knife carrier and effecting disengagement of the clutch rollers. The clutch member 4| is then free to ro-v tate about the cage member which carries the rollers 39 and the knife is retained in idle position.

Simultaneously with engagement of the knife with the arm 53 of the plunger, the leaf spring |22 on the member i 6 drops back of a. shoulder |23 on the retractive side of the knife carrying arm, as best shown in Fig. 14. It isthus apparent that the knife is locked between the ends of the spring leaf and the arm 53 on the plunger so as to prevent further movement of the knife until it is again tripped by the tripping mechanism.

During return movement of the knife assembly to its latched position the roller 22 has been moved by the eccentric away from engagement therewith incidental to the continued move-y ment of the shaft 66. As soon as the shaft 66 has made one revolution the trip is again carried into position for engaging under the succeeding work-pieces and the tooth thereof has reengaged the lug |06 to stop rotation of the shaft 66 until the space betweenthe succeeding work-pieces again aligns with the trip, whereupon the trip again operates to effect actuation of the knife and severance of the binding strip.

It is thus obvious that I have provided a severing mechanism that is operated rin timed relation with movement of the work-pieces and the knife is therefore operated to sever the binding strip in the time necessary to prevent damage to the Work-pieces. With this arrangement it isrobvious that the machine requires no adjustment when variable length work-pieces are run through the machine, and. in fact, workpieces of different lengths may be moved successively through the machine and the cuts are madeat the proper intervals for the reason that the knife is operated under control of the workpiece spacings.

What I claim and desire to secure by Letters Patent is:

V1. In ar machine of the character described, means for moving Work pieces in a fixed path while connected in spaced relation by a continuous strip,fmeans vfor severing said strip including a knife, means mounting the knife for movement across and shifting movement in the direction of movement of the work pieces, knife operating;l'in'eans, la clutch connecting the knife with said operating means, means supported in contact with the work pieces to enter said spaces between the Work pieces as said spaces approach the knife, and means actuated by said contact means to render the clutch effective in actuating the knife to sever the strip.

12. In a machine of the character described, means for moving work pieces in a fixed path while connected in spaced relation by a continuous strip, means for severing said strip including a knife, means mounting the knife for rotary movement across and shifting movement in the direction of movement of the work pieces, knife operating means, a clutch connecting the knife with said operating means, a trip, means supporting the trip in engagement with the work pieces to enter said spaces between the Work pieces as said spaces approach the knife, and means connecting the trip with the clutch to render said clutch effective for actuating the knife to sever the strip.

3. In a machine of the character described, means for moving Work pieces in a fixed path while connected in spaced relation by a continuous strip, means for severing said strip including alknife, means mounting the knife for rotary movement across and shifting movement in the direction of movement of the work pieces, knife operating means, a clutch connecting the knife with said operating means, means for latching the knife from rotary movement, a trip, means supporting the trip in contact with the work pieces to enter said spaces between the work pieces as said spaces approach the knife, and release mechanism connected with the trip and controllably engaging with the knifeto effect release of the knife from said latch means.

4. In a machine of the character described, means for moving work pieces in' a fixed path while connected in spaced relation by a continuous strip, means for severing said strip including a knife, means mounting the knife for rotary movement across and shifting movement in the direction of movement of the work pieces, knife operating means, means for latching the knife from rotary movement, a trip, means supporting the trip Yin contact with the workpieces for entering said spaces between the work pieces as said spaces approach the knife, and release mechanism vconnected with the trip and engageable with the knife to effect release of the knife from said latch means.

5. VIn a machine of the character described, means for moving work pieces in a fixed path while connected in spaced relation by a continuousstrip, means. for severing said strip including a knife, means mounting the knife for rotary movement across and shifting movement in the directionof movement of the work piecesknife operating means, an over-running clutch connecting the knife with said operating means, means for latching the knife from rotary movement and to retain the clutch in disengaged condition, a trip, means supporting the trip inengagement with the work pieces for entering said spaces between the work pieces as said spaces approach the knife, release mechanism connected with the trip and engageable with the knife to effect release of the knife from said latch means and driving engagement of the over-running clutch, and means for effecting shifting movement of the knife.

6. In a machine of the character described, means for moving work pieces in a fixed path while connected in spaced relation by a continuous strip, means for severing said strip including a knife, a shaft supporting the knife, means mounting the shaft for longitudinal shifting movement in the direction of travel of the work pieces, a carrier mounting the knife on the shaft, a clutch on the shaft for connecting the knife carrier in driving relation with the shaft, means for actuating the shaft including means for retaining the knife carrier in retractive position, and means actuated by the work pieces for effecting shifting of the shaft in the opposite direction to shift the knife with movement of the Work pieces.

7. In a machine of the character described, means for moving work pieces in a xed path while connected in spaced relation by a continuous strip, means for severing said strip including a knife, a shaft supporting the knife, means miounting the shaft for longitudinal shifting movement in the direction of travel of the work pieces, a carrier mounting the knife on the shaft, a clutch on the shaft for connecting the knife carrier in driving relation with the shaft, latching means for the knife carrier, means for actuating the shaft including means for retaining the knife carrier in latched position, and means actuated by the work pieces for shifting the shaft to effect release of the knife carrier and engagement of the clutch to actuate the knife.

8. In a machine of the character described, means for moving work pieces in a xed path while connected in spaced relation by a continuous strip, means for severing said strip including a knife, a shaft supporting the knife, means mounting the shaft for longitudinal reciprocatory movement in the direction of travel of the work pieces, a carrier mounting the knife on the shaft, a clutch on the shaft for connecting the knife carrier in driving relation with the shaft, latching means for the knife carrier, means for actuating the shaft including means for retaining the knife carrier in latched position, a rock lever bearing on the knife carrier to move the knife carrier out of latched position, and trip mechanism contacting the work pieces including means for actuating the rock lever.

9. In a machine of the character described, means for moving work pieces in a fixed path while connected in spaced relation by a. continuous strip, means for severing said strip including a knife, a shaft supporting the knife, means mounting the shaft for longitudinal shifting movement in the direction of travel of the work pieces, a carrier mounting the knife on the shaft, a clutch on the shaft for connecting the knife carrier in driving relation With the shaft,

l'atching means for the knife carrier, means for actuating the shaft including means for retaining the knife carrier in latched position, a rock lever bearing on the knife carrier to move the knife carrier out of latched position, a trip shaft, an eccentric on the trip shaft for actuating the rock lever, means for rotating the trip shaft including a slip clutch, and a trip mechanism for normally preventing rotation of the trip shaft and engageable between the work pieces to effect release of the shaft and actuation of the knife.

l0. In a machine of the character described, means for moving Work pieces in a fixed path while connected in spaced relation by a continuous strip, means for severing said strip including a knife, a shaft supporting the knife, means mounting the shaft for longitudinal shifting movement in the direction of travel of the work pieces, a carrier mounting the knife on the shaft, a clutch on the shaft for connecting the knife carrier in driving relation with the shaft, latching means for the knife carrier, means for actuating the shaft including means for retaining the knife carrier in latched position, a rock lever bearing on the knife carrier to move said knife carrier out of latched position, a trip shaft, an eccentric on the trip shaft for actuating the rock lever, means for rotating the trip shaft including a slip clutch, a trip carrier on the trip shaft, a trip on the trip carrier, and means for latching the trip to prevent rotation of the trip carrier when the trip is engaged under the work pieces and releasable when the trip engages the ends of the respective Work pieces to effect actuation of the knife.

11. In a machine of the character described, means for moving work pieces in a fiXed path while connected in spaced relation by a continuous strip, means for severing said strip, means for actuating the severing means and means controlling actuation of said severing means including a4 trip shaft, means for rotating the trip shaft including a slip clutch, a trip carrier on the trip shaft, a trip on the trip carrier, and means for latching the trip to prevent rotation of the trip carrier when the trip is engaged under the work pieces and releasable when the trip engages the ends of the respective work pieces.

12. In a machine of the character described, means for moving work pieces in a fixed path while connected in spaced relation by a continuous strip, means for severing said strip including a knife, means mounting the knife for rotary movement across and shifting movement in the direction of movement of the Work pieces, knife operating means, an over-running clutch connecting the knife With said operating means, means for latching the knife from rotary movement, and a cam for returning the knife to latched position.

13. In a machine of the character described, means for moving work pieces in a fixed path while connected in spaced relation by a continuous strip, means for severing said strip including a knife, a shaft supporting the knife, means mounting the shaft for longitudinal shifting movement in the direction of travel of the work pieces, a carrier mounting the knife on the shaft, a clutch on the shaft for connecting the knife carrier in driving relation with the shaft, latching means for the knife carrier, means for actuating the shaft including means for retaining the knife carrier in latched position, means for moving the knife carrier out of latched position, and a cam for returning the knife carrier to latched position.

14. In a machine of the character described, means for moving work pieces in a fixed path and connected in spaced relation by a continuous strip, means for severing said strip, means for moving the severing means across said strip and through the space between said work pieces, means for shifting the severing means in the direction of movement of the work pieces at the time the severing means is passing through said strip, and cam means for returning the knife.

15. In a machine of the character described, means for moving work pieces in a xed path while connected in spaced relation by a continuousstrip, means for severing said strip including a knife, means for operating the knife, a clutch connecting the knife with said operating means,

means latchingly retaining the knife in retracted position, a trip, means supporting the trip in contact with the work pieces to enter said spaces, and release mechanism connected With the trip and controllably engaging with the knife to effect release of the knife from said latch means.

DIETRICH DANEKE.