US2030130A - Machine for operating upon hides, skins, and leather - Google Patents

Description

R. F. WHITNEY 2,030,136

AND LEATHER MACHINE FOR OPERATING UPON HlDES, SKINS Filed July 7, 1934 4 Sheets-Sheet l Feb, 11, 1935,, R w N 2,930,13O

MACHINE FOR OPERATING UPON HlDES, SKINS, AND LEATHER Filed July 7, 1954 4 Sheets-Sheet 2 A33 3 38 50 A 52 2242 I, I m $8 50 1 67 Feb, 11, 1936. R. F; WHITNEY I 2,030,130

MACHINE FOR OPERATING UPON HIDES, SKINS, AND LEATHER Filed y '7, 1934 4 Sheets-Sheet s a3 m4 /M O a 2 jg 5 g 3i 5%? 3 m7 //4 /Z& 5 a4 6 /0 20 m 22 I\\ & V V

Ebb. 11, 1936. R wHlTNEY 2,030,130

MACHINE FOR OPERATING UPON HIDES, SKINS, AND LEATHER Filed July 7, 1934 4 Sheets-Sheet 4 Patented Feb. 11, 1936 UNITED STATES PATENT OFFICE MACHINE FOR OPERATING UPON HIDES, SKINS, AND LEATHER Application July 7, 1934, Serial No. 734,117

20 Claims.

This invention relates to machines for operating upon hides, skins and leather. While the invention is embodied in a machine for performing beaming or scudding operations upon skins it. is to be understood that the invention and various important features thereof may have other applications and uses.

This invention is an improvement upon the machine shown in United States Letters Patent No. 1,658,506, granted February 7, 1928, upon an application filed in the names of J. A. Wheeler and R. F. Whitney. It is an object of the present invention to improve and simplify the embodiment of the invention disclosed in the patented machine and to provide a machine adapted particularly for the handling of small pieces of work such as kid and calf skins.

To these ends and in accordance with an important feature of the invention there: is provided a work support upon which each piece of work in turn is clamped, during treatment, by a work clamping member arranged to be operated by the work support in such manner that as the work support moves toward work presenting position with respect to a bladed cylinder the work clamping member is caused to approach the work support and finally to engage the work and clamp it firmly on the work support, the work support and work clamping member remaining stationary in work presenting position during treatment of the work by said bladed cylinder. After the work support has moved a predetermined distance to- Ward work receiving position away from the bladed cylinder, to insure that the work piece in 5 the machine is spaced from said bladed cylinder, the work clamping member is lifted promptly from engagement with the work sothat the operator may remove the work early in the movement of the work support toward open position and thus be enabled to introduce a fresh piece of work as soon as the work support and the work clamping member arrive at wide open work receiving postion. Conveniently the work clamping member is pivoted to the work support by cam members arranged to be guided by cam rolls carried by the frame of the machine.

' Another important feature of the invention resides in an arrangement wherein a shaft, coaxial with 'a shaft supporting the bladed cylinder, is provided with connections for operating a flexible work support or bolster to move the latter bodily toward and from the bladed cylinder so that pieces of work may be readily introduced when th'e'bolster is in work receiving position and then 5 operated upon while the bolster is pressing the work against the bladed cylinder. As shown, the bolster is carried at one end by the work support to which the work clamping member is pivoted and by which it is operated, in an organization wherein the work support, the bolster, and the 6 work clamping member are all operated in properly timed relation by connections with the single shaft located in coaxial relation to the shaft which carries the bladed cylinder. There is thus provided a simple, durable, and highly efficient 10 and compact construction for performing scudding or beaming operations upon pieces of work such as calf and goat skins.

These and other features of the invention and novel combinations of parts will now be described in detail in the specification and then pointed out more particularly in the appended claims.

In the drawings,

Fig. l is a front elevation partly in section of a beaming or scudding machine showing one embodiment of the invention;

Fig. 2 is an end view looking from the left in Fig. 1, parts being broken away the more clearly to disclose the invention;

Fig. 3 is a section along the line III-III of Fig. 1, looking in the direction of the arrows;

Fig. 4 is a view of the starting and stopping mechanism of the machine;

Fig. 5 is a View along the line VV of Fig. 4;

Fig. 6 is a view taken along the line VIVI of Fig. 4;

Fig. 7 is a sectional view along the line VII-VII of Fig. 4;

Fig. 8 is a view similar to Fig. 2 showing an auxiliary work clamping means; and

Fig. 9 is a View similar to Fig. 8 showing the work clamping parts in open work receiving position.

In the illustrated machine, which is specially designed to perform beaming or scudding oper- 0 ations upon kid and calf skins, there is provided a bladed cylinder or drum ID, the blades 12 of which are disposed somewhat helically upon the surface of the cylinder and serve as both scudding and spreadingblades while blades M are disposed nearly or quite parallel tothe axis of the drum and serve more as scraping blades. Preferably and as shown, the drum I0 is secured upon a hollow shaft or quill l6 mounted in bearings ll'in end members l8 (Fig. 2) of the machine frame. Secured to the quill I6 as by a spline 20 (Fig. '7) is a large gear wheel 22 arranged in mesh with a pinion 24 (Figs. 1 and 2) fixed to a counter shaft 26 which also carries a pulley 28 adapted to serve as' thepower pulley of -85 of the box "n,

the machine. With power applied to the pulley 28 the bladed drum is will be continuously rotated as in practically all beamhouse machines.

In the illustrated construction, the skins are supported while being treated by a work support mechanism comprising a combined work support and work clamping member so carried at the upper ends of a pair of swing arms 32 pivotally mounted at their lower ends upon posts 33 constituting part of the end frames 18 of the machine. For operating the swing arms 32 about their pivots 35 there is provided a pair of pitmarm 34 each having its front end pivoted at 36 to the upper end of the corresponding swing arm 32, and its rear end pivotally connected to a crank pin 38 (Figs. 2 and '7) said crank pin being carried by a crank arm rigid with a hub portion is of a cam wheel .2 splined at 14 to a shaft 46 that extends through and projects from the ends of the hollow shaft or quill H3. As shown most clearly in Fig. 7, the shaft to has end bearings at 48 within the quill it, the said shaft :35 carrying at one end the hub portion to of the cam wheel 42, as stated above, and at its other end merely a crank arm (not shown) to operate a pitman like the pitman As indicated in Figs. 2 and '7, each pitman comprises a middle portion which is provided at its ends with right and left hand threads for adjustable engagement with similarly threaded socket carrying members 56 forming parts of the pitman so that the latter may be adjusted in length to facilitate proper positioning of the swing arms 32 in relation to the drum IE3 and to an upper clamping member hereinafter described.

The work support mechanism'mentioned above comprises also a flexible support or bolster 52 of a Width coextensive with the length dimension of the drum I ll, the purpose of the bolster 52 being to support a piece of work such as a skin 5 (Fig. 3) for the action of the blades I2, I4 on the drum id. The flexible support or bolster 52 is attached at its lower end by means of a clamping bar 56 to a relatively heavy rod or pipe 58 (Fig. 3) rigidly clamped in the lower ends of two levers, one of which is shown at 68 (Figs. 1 and 2), each pivotally mounted at B2 on an end frame it of the machine. At its upper end the bolster 52 is disposed over the upper surface of the lower work clamping member 30 and is rigidly secured by bolts to a. front bar 51 of said lower work clamping member 30. Pivoted at $8 to each swing arm 32 is a link 18 which is slidable at its other end through an opening of suitable size in a box member 22 pivotally mounted at '14 upon an intermediate portion of the lever 50, a spring l6 being interposed between washers 18 on the link 20 and another washer at the other .-end of-the spring it, the latter washer being backed by nuts 82 screw threaded on the link I0 to adjust the tension of the spring it. t its free end the link it screw threaded and provided with nuts 35. adapted to engage an extension the arrangement being such that the levers are swung forwardly as the swing arms 32 move forwardly to carry the bolster 52 to work receiving position, whereas, upon .movement of the swing arms 32 in the reverse "direction into the position shown in Fig. 2 the levers 6d are move to carry the bolster 52 into position to press the work against the drum l8, yielding of the bolster 52 away from the drum s It being permitted by the springs '56, thereby to accommodate variations in the thickness of the work.

For co-operation with the lower work clamping member 36 there is provided an upper work clamping member 90, the said work clamping member being shown as an I-beam secured at its ends to a pair of cam members 92, each pivoted at $4 to the upper end of the adjacent swing arm 32. Each cam member 92 has a cam slot 96 for the reception of a cam roll 98 rigidly carried by a casting I00 adjustably secured by bolts I02 to the upper ends of the frame posts 33. The castings I80 may be readily adjusted by loosening the bolts I02 and by proper manipulation of adjusting screws or bolts I04. As shown in Fig. 1, the bolts I02 also pass through a frame cross bar I 03 secured to the castings I00. It will be understood that upon movement of the swing arms 32 to the right in Fig. 2 the cam members 92 will be swung about the pivots 34 by the cam rolls 98 in the cam slots 90, the arrangement being such that the upper work clamping member is swung upwardly to a wide-open position to facilitate removal of the work and insertion of a fresh piece of work. However, the clamp member 90 remains in clamping position during the first part of the outward movement of the swing arms 32, so as not to release the work until it has been moved away from the blades of the cylinder I0.

For operating the swing arms 32 through the pitmans 34 and the shaft 46, at the will of the operator, there is provided means for clutching the cam wheel 42 to the gear 22, it being recalled that cam wheel 42 is fastened to shaft 46 and the gear 22 is splined to the hollow shaft or quill I0. As shown most clearly in Figs. 4 and 7, the. clutching means comprises an annular member I06 carried by a circular hub member 101, of the cam wheel 42, extending into an open cup portion of the gear Wheel 22. Pivoted at I08 to the annular member I08 is a toggle link member I I0 adjustable in length through having one constituent part screw threaded into another part,

the toggle link I I0 having a ball portion II2 arranged to engage in a socket I I4 in the end of a link member II 6 pivoted at IIB to the annular part of the cam wheel 42. Pivoted to the link member H6 is an arcuate clutch member I20 adapted to engage an inside cylindrical surface I22 of the cup portion of the gear Wheel 22. Upon rotating the annular member I06 in a clockwise direction, in Fig. 4, the pivot I08 is moved with the member I06 to bring the center of the pivot in the dotted line in said Fig. 4, thus in efiect straightening a toggle of which one portion is the toggle link member I I0 and the other portion is a part of the annular member I 06. By

thus straightening the toggle the arcuate clutchmembers I20 are caused to engage the inner surface I22 of the gear wheel 22, thus clutching the member I06. When the stop member I24 is projected into the path of one of the arms I30 and engages the wooden block I28 therein the annu lar member I06 is turned in a counterclockwise direction, thus breaking the toggle and permitting a spring I32 to move the arcuate clutch mem- This moveadjacent portion of the cam member 92.

ber I20 away from the clutching surface I22 on the gear wheel 22. It will be noted that the springs I22 serve also as buffers to soften the shock by which the cam wheel 42 and its connected parts are brought to rest. A pair of studs I33 on the annular member I06 project there:- from into position to engage opposite sides of a spoke I35 of the cam wheel 42 to prevent undesirable displacement of the annular member I06. Upon inspection of Figs. 1, 2, and 3 it will be observed that the stop member I24 is secured to a shaft I40 mounted in bearings carried by the machine frame and that at its forward end said shaft I40 carries an arm I42 adapted to be: engaged by an arm I44 of a treadle lever I46 pivoted at I48 on the frame post I8, depression of the treadle I46 being resisted by a spring I55 one end of which is secured to a portion of the machine frame and the other end of which is attached to an arm I52 extending downwardly from the rear end of the shaft I ll the spring I50 having the function also of holding the stop member I24 yieldingly against the rim of the cam wheel 42 until a notch I54 in the rim is: encountered by a roll I56 carried by the member I24.

If desired an additional work clamping member I 60 (Figs. 8 and 9) may be provided to insure against displacement of the work. While the work clamping member 95 is amply sufficient to hold all the common grades of work during treatment thereof by the blades I2 and I4, the additional work clamping member I60 may be advantageously provided for larger and heavier pieces of work which are also unusually difficult to send or .to fine hair. As shown, the auxiliary work clamping member I60 is mounted upon levers I62 pivoted at I64 upon the cam members 92. Each lever I62 has a curved arm I66 extending over the top of the corresponding cam roll 95, said curved am having a cam portion I68 for a purpose which will be hereinafter described. Connected to the end of the arm I66 is a spring I10 the other end of which is adjustably secured to an As shown most clearly in Fig. 9, the auxiliary clamping member I60 is provided with a concaved surface I'I2 for smoothly engaging the work and pressing it against a correspondingly convexed surface on the work support or lower clamping member 30.

It will be understood that, the machine shown in Fig. 8 is at the same point in its cycle of operations as the machine shown in Fig. 2, that is, with :the work clamping devices stationary in work clamping position. Following depression of the treadle I46 (Fig. 2) the crank pin 38 will move upwardly in the direction of the arrow (Fig. 2) with the result that the swing arms 32, work supporting member 30, and work clamping members 90 and I 60 will be moved toward the right in Figs. 2 and 8. Since approximately the first half I13 of the lower wall of the cam slot 96 is concentric with respect to the axes of the pivot pins 1350f the swing arms 32, the Work clamping member'90 will not be disturbed while the crank pin 38 is moving upwardly through an arc of about 45, the reason for this being that the work should remain firmly that is, positively clamped 70 rto the work support 30 so long as any part of the work is still being contacted by the blades l2 and I4. At the'point above mentioned, that is, when the crank pin SShas moved through about 45, the auxiliary work clamping member 60 starts ;to.move upwardly, this being due to the fact that the upwardly curved cam surface I68 on the arm I66 permits corresponding downward movement of the arm I66 under the action of the spring I10. By the time the crank pin 38 has traveled through an arc of both clamping members 90 and I60 have moved upwardly away from the work so that the operator may begin to withdraw the latter from the machine, the combined upward movement of the clamping members 90 and I60 as thus far described being due to a. cam surface I74 on the lower wall of the cam slot 96. From then on each cam member 92 is swung about its pivot 84 due to the passing of said pivot 94 beyond a line connecting the axis of the cam roll 98 with the axis of the pivot 35 of the swing arm 32, the result being that what has theretofore been ,a forward movement of the cam members 92 (that is, in the direction of movement of the swing arms 32) is reversed with the result that the ,cam

members 92 tip backwardly as shown in Fig. 9

during which there is a rearward movement of the cam slot 96 with respect to the cam roll 98. Fig. 9, it will be understood, shows the work clamping members 90 and IE0 in fully open position in which they offer no obstruction to the introduction of a fresh piece of work. Upon again depressing the treadle I 46, the work clamping members 90 and E60 and the work support 30 move in the reverse direction, that is, from the position shown in Fig. 9 to that shown in Fig. 8, with the result that the work is first clamped by the clamping member 90 and then by the auxiliary work clamping member I60. In both cases these work clamping members come down squarely upon the work so as not to be drawn thereover, since the latter might result in sending the work.

In operating the machine, a skin 54 is introduced into the machine when the upper work clamping member 90 (and I00, if present) and the swing arms 32 and the lower work supporting and work clamping member 30 are in open work receiving position (Fig. 9). The treadle I46 is then depressed whereupon the swing arms move to the positions shown in Figs. 2 and 8. During this movement of the swing arms the upper clamping member 90 (together with I60) moves downwardly to engage the work resting upon the upper surface of the lower work clamping and supporting member work taking place before it is presented to the blades of the cylinder I0. Also the levers (it are moved by the swing arms 32 to tension the flexible work supporting bolster 52 and bring it blades I2 and I4 on the drum I0, it being recalled that the drum i0 is continuously in rotation.-

After an interval, during which the blades operate upon the work, the operator again depresses the treadle I46 to cause the swing arms 32 .to move to open position, the upper work clamping member 96 (and E60) moving upwardly to release the work only after the bolster 52 has been moved away from the blades of the cylinder I0 far enough to insure that the work will not be pulled into the machine by the rotating cylinder I0. This delay in the upward movement of the clamping member $30 (and I60) is due to the fact that the first half of the slot 92 is concentric with respect to the pivots 35 of the swing arms 32. The operator starts to remove the skin as soon as the latter is released at the beginning of the upward movement of the work clamping member 90v since it has to be reversed to secure treatment of the remaining portion of the skin. The otherhalf,

30, the clamping of the i. e.,'the untreated portion of the work, is then introduced into the machine by throwing it over the lower clamping member 3-9 into position upon the flexible bolster 52 which has been moved away from the drum it! into a work receiving position along with the swing arms 32 and lower clamping member 30. No attempt is made to straighten out the work except as that may be accomplished by stretching the work along the lengthwise dimension of the lower work clamping member 30, for the reason that, as the bolster approaches the drum, the blades of the latter in first contaoting with the skin spread it out and then almost instantly operate to clean the surface of the skin of all hair, loose epithelial cells, and dirt. While the machine may be employed in unhairing operations upon light hides and skins, it is specially intended to perform the operations of fine hairing and beaming or scudding, that is, removing the fine hairs which persist after the usual unhairing operation and cleaning the surface of the skins from loose epithelial cells and hair follicles, and from the dirt which has remained after the liming and unhairing operations.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a machine for operating upon hides, skins and leather, a tool for treating the work, a work support movable between work receiving and Work presenting positions with respect to said tool, said work support being stationary in its work presenting position while said tool is operating on a piece of work, a member for clamping the work on the work support just before the work is pressed against the tool, and co-operating cam members arranged to move the work clamping member to operative position as the work support moves to present the work to said tool, one of said cam members being stationary and the other movable with the work support during movement of the latter to work presenting position.

2. In a machine for operating upon hides, skins and leather, a rotary tool for treating the work, a work support having a pivotal mounting about which it is oscillated between work receiving and work presenting positions with respect to said tool, a member pivoted to the work support for clamping the work on the work support just before the work is pressed against the tool, said work support and work clamping member remaining stationary during treatment of the work by said tool, and co-operating cam members mounted on the work support and on the frame of the machine and operated by the work support during movement of the latter in one direction about its pivotal mounting to move the work clamping member positively to its operative or work clamping position.

3. In a machine for operating upon hides, skins and leather, a rotary tool for treating the work, a work support movable between work receiving and work presenting positions with respect to said tool, swing arms upon which said work support is mounted, a member pivoted to the swing arms for clamping the work on the work support just before the work is presse against the tool, and co-operating cam members and cam rolls mounted on the work clamping member and on the frame of the machine and operated by the work support to move the work climping member positively both toward and from the work support in timed relation to the movements of the work support.

4. In a machine for operating upon hides,

skins and leather, a rotary tool, a hollow shaft to which said tool is secured, means for driving said shaft, a work support, a shaft mounted in said hollow shaft and arranged to operate the work support, Work clamping means pivoted to the work support and arranged to be operated by the latter, and a clutch under the control of the operator for clutching the last recited shaft to said hollow shaft to effect movement of the work support toward and from said rotary tool.

5. In a machine for operating upon hides, skins and leather, a rotary tool for operating on the work, a work support movable between work receiving and work presenting positions with respect to said tool, a hollow shaft to which the rotary tool is securely fastened, power means for driving said shaft, means comprising a shaft mounted coaxially with respect to said hollow shaft and having connections to operate said work support, a work clamping member operated by the work support alternately to clamp the work on the support and to release the same, and means for clutching the last recited shaft to said hollow shaft whereby the work support may be moved toward and away from the rotary tool and the clamping member toward and away from the work support.

6. In a machine for operating upon hides, skins and leather, a rotary tool for treating the work, a work support movable between Work receiving and work presenting positions with respect to said too-l, a member for clamping the work on the work support just before the work is pressed against the rotary tool, cam members connected to said work clamping member and pivotally mounted upon the work support, and cam rolls mounted upon the frame of the machine for engagement with said cam members for positively operating the work clamping member both toward and from co-operative relation with respect to said work support as the latter moves between work receiving and work presenting positions.

'7. In a machine for operating upon hides, skins and leather, a rotary tool, a hollow shaft to which said cylinder is secured, means comprising a gear wheel splined to said shaft for driving the latter, a work support, a shaft mounted in said hollow shaft and arranged to operate the work support, and a clutch under the control of the operator for clutching the last recited shaft to said gear wheel to effect movement of the work support toward and from said rotary tool.

8. In a machine for operating upon hides, skins and leather, a bladed cylinder for operating upon the work, a hollow shaft supporting said cylinder, a gear wheel splined to said shaft, a pinion to drive said gear wheel, a shaft mounted for rotation in said hollow shaft and having crank arms secured to its ends, pitmans connected to said crank arms, a pair of swing arms arranged to be operated by said pitmans, a work support carried by the swing arms, and means under th control of the operator to clutch the last-recited shaft to said gear wheel to effect movement of the swing arms and work support alternately toward and from the bladed cylinder.

' 9. In a machine for operating upon hides, skins and leather, a rotary tool for operating upon the work, a shaft to which said tool is secured, power means to drive said shaft, a bolster to support the work during treatment by said rotary tool,

means connected to the ends of the bolster movably to support the latter, a shaft mounted axially with respect to the first-mentioned shaft for rotation therewith and arranged to operate said bolster supporting means to move the bolster bodily with respect to the bladed cylinder, and means under the control of the operator to clutch thesecond-mentioned shaft to said power means to effect movement of the bolster alternately toward and from the bladed cylinder.

10. In a machine for operating upon hides, skins and leather, a rotary tool for operating on the work, a hollow shaft to which said tool is seourely fastened, means for driving said shaft, bolster to support the work during treatment thereof by the rotary tool, swing arms connected to opposite ends of the bolster movably to support the latter, a shaft mounted for rotation in said hollow shaft and arranged to operate said swing arms to move the bolster bodily with respect to the rotary tool, and a clutch under the control of the operator for operatively connecting the last-recited shaft to said hollow shaft during rotation of the latter to cause movement of the bolster alternately toward and away from said rotary tool.

11. In a machine for operating upon hides, skins and leather, a rotary tool, a hollow shaft journaled in the frame of the machine and to which said tool is securely fastened, means to drive said shaft, a work support, a bolster connected at one end to said work support, means for movably supporting the other end of the bolster below said cylinder, a shaft journaled in said hollow shaft, means driven from the last-recited shaft to move the work support and bolster bodily toward and from the rotary tool, and a clutch device under control of the operator for operatively connecting the last-recited shaft to said hollow shaft during rotation of the latter through 180 whereby said work support and bolster are moved alternately between work receiving and work presenting positions with respect to the rotary tool.

12. In a machine for operating upon hides, skins and leather, a rotary tool, a hollow shaft journaled in the frame of the machine and to which said tool is securely fastened, means to drive said shaft. a work support comprising a pair of swing arms, a bolster connected at one end to said work support, swing arms and a connecting bar for supporting the other end of the bolster below said cylinder, links connecting the work support swing arms to the bolster supporting swing arms, whereby the latter are operated by the former so that the bolster moves bodily between work receiving and work presenting relation to the rotary tool, a shaft journaled in said hollow shaft and arranged to operate said work support and bolster, and a clutch device under control of the operato'r for operatively connecting the last-recited shaft to said hollow shaft during rotation of the latter through 180.

13. In a machine for o'peratin upon hides, skins and leather, a rotary tool for operating on the work, a shaft mounted in the frame of the machine and arranged to have said tool fixedly secured thereto, means for driving said shaft, a work support movable toward and away from said rotary tool, a shaft mounted coaxially with respect to the first-mentioned shaft and arranged to move said work support yieldingly toward said rotary tool, and means for clutching said shafts to each other for rotation of the second-mentioned shaft through 180 whereby the work support is moved alternately between work receiving and work presenting positions with respect to said rotary tool.

14. In a machine for operating upon hides, skins and leather, a bladed cylinder for operating on the work, a shaft mounted in the frame of the machine and arranged to have said cylinder fixedly secured thereto, means for driving said shaft, a work support comprising a bolster and a supporting device therefor movable toward and away from said cylinder, a shaft mounted coaxially with respect to the first-mentioned shaft, crank arms connected to the ends of the second-mentioned shaft, pitmans pivoted to said crank arms and to said bolster supporting device, and means for clutching said shafts to each other for rotation of the second-mentioned shaft through 180 whereby the bolster is bodily moved alternately between work receiving and work presenting positions with respect to said cylinder.

15. In a machine for operating upon hides, and leather, a tool for operating on the work, a support for the work while it is being operated on by said tool, means for moving the work support toward and from said tool, a work clamping member movable toward and from the work support during movement of the latter toward and from said tool, means to cause the described movements of said work clamping member, and an auxiliary work clamping member mounted upon the first-mentioned work clamping member and arranged to be operated in timed relation to the movements of said work support.

16. In a machine for operating upon hides, skinsand leather, a tool for operating on the work, a support for the work movable between work receiving and work presenting positions with respect to said tool, a work clamping member pivotally mounted upon said work support, co-o-perating cam roll and cam-slotted members for operating the work clamping member during movements of said work support, and an auxiliary work clamping member arranged to be operated by one of said cam roll and cam-slotted members toprovide additional clamping effect upon the work.

17. In a machine for operating upon hides, skins and leather, a tool for operating on the work, a support for the work while it is being operated on by said tool, swing arms at the upper ends of which said work support is mounted, means for operating the swing arms to move the work support between work receiving and work presenting positions with respect to said tool, a member mounted on the swing arms and 0perative to clamp the work upon said work support, an auxiliary work clamping member mounted on the first-mentioned work clamping member, and means for operating both work clamping members in timed relation to each other and to said work support.

18. In a machine for operating upon hides, skins and leather, a tool for operating on the work, a support for the work movable between work receiving and work presenting positions with respect to said tool, a work clamping mem ber, members secured at each end of said work clamping member and pivotallymounted upon said work support, co-operating cam roll and cam-slotted members carried by the frame of the machine and by said pivoted members to cause movements of the work clamping member in timed relation to movements of the work support, and an auxiliary work clamping member mounted on said pivoted members and arranged to be operated by one of said cam roll and camslotted members in timed relation to the movements of said work support.

19. In a machine for operating upon hides, skins and leather, a tool for operating on the work, a support for the work while it is being operated on by said tool, swing arms carrying said work support, means to operate the swing arms to move the work support alternately between work receiving and work presenting positions with respect to said tool, cam-slotted members pivotally connected to said swing arms, a work clamping member carried by said camslotted members, cam roll members mounted on the frame of the machine and arranged to cooperate with said cam-slotted members to operate the Work clamping member in timed relation to the work support, and an auxiliary work clamping member arranged to be operated by one of said cam roll and cam-slotted members in timed relation to the movements of the work support.

20. In a machine for operating upon hides, skins and leather, a tool for operating on the work, a support for the work while it is being operated on by said tool, swing arms carrying said work support, means to operate the swing arms to move the work support alternately between work receiving and work presenting positions with respect to said tool, cam-slotted members pivotally connected to said swing arms, a work clamping member carried by said camslotted members, cam rolls mounted on the frame of the machine and arranged to co-operate with said slotted members to operate the Work clamping member in timed relation to the work support, an auxiliary work clamping member pivotally mounted upon said cam-slotted members and arranged to be operated by said cam rolls in timed relation to the movements of said work support.

ROBERT F. WHITNEY.

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