US1744420A - Staking machine - Google Patents

Description

Jan. 21, 1930. c. F. STACKPOLE 1,744,420 I 'STAKING MACHINE Original Filed Sept. 9, 1924 4 Sheets-Sheet 1 I Inv'enfor Jan. 21, 1930. c. F. STACKPOLE STAKING MACHINE Original Filed Sept. 9, 1924 4 Sheets-Sheet 2 jn zrenior J 1930. c. F. sTAcKPoLE STAKING' MACHINE Original Filed Sept. 9, 1924 4 Sheets-Sheet 4 Patented Jan. 21, 1930 s'rAr CHARLES E. STACKPOLE, O33 LYNN, MASSACHUSETTS, ASSIGNOR TO THE TURNER TAN- N ING MACHIN CUMEANY, 0F PORTLAND, MAINE, A CORPORATION OF MIAINE STAKING MACHINE Application filed September 9, 1324, Serial No; 736,724. Renewed June 19, 1928.

Tlis invention relates to staking machines and more particularly to staking machines which are provided with a plurality of stakingt-ools for operating on the work.

lVhile a number of machines on the market perform stai ng operations on various kinds of leather with results more or less satisfactory, the staking of glove leather is still performed in tl is country by skilled workmen called knee-stalkers. In kneestaking operations the workman draws a skin back and forth over the edge of a staking lade fastened to the upper end of a post or standard tired to the staking-room floor, and in these operations his bare knee is em ployed as well as his hands in holding and in forcing the skin with the requisite tension over the edge of the blade. It will be readily understood that such operations require skilled workmen with strong hands and with the skin of the hands and of the bare knee accustomed to sense the correct tension on the skin under" varying conditions and for all portions of the skin undergoing the staking operation. Not only must the worker skilled in knee-staking operations but he must also be physically strong and of unusual endurance since knee-staking is very laborious and since the operator must stand on one foot the greater part of thetime and at all times in a position humped over his work.

In view of the foregoing, it is an object of this invention to provide a machine, especially adapted to the staking of glove leather and of leather having similar qualities for other purposes, by the use of which such stakoperations may be performed economically and otherwise satisfactorily and without involving arduous labor on the part of the workmen.

To this end and in accordance with important -features oi the invention, there are provided in the illustrated embodiment of the invention two staking tools arranged to operate simultaneously upon opposite sides of a piece of leather, one staking tool being movable over and around the operative edge of the other staking tool to head the work sharply over the edges of hetl'. iools to cli'ect stretching of the leather in substantially equal amounts on its two surfaces. Preten ably, and as shown, one staking tool has an inclined operative portion and an operative stroke in a direction away from the direction of inclination of the operative portion of the blade so that there is no tendency of the blade to cut into the work. vi hile the flesh side of the skin is operated upon directly by the sharp staking blade which scrapes and flexes and stretches the same, the grain side is also operated upon indirectly by the same blade sinc it is the acute bending of the grain surface over the edge of the blade which effects the opening up of the pores of the grain side and the softening and stretching thereof. In the illustrated construction one staking tool is mounted eccentrically for operative movement with respect to a roller which presses the skin against the other staking tool, the arrangement being such that the first-mentioned tool not only moves over the edge of the second staking tool but inwardly toward the same so as to insure that the skin will be bent over the said edge with the requisite sharpness in the angle formed in the skin. The described eccentric 1nounting of one of the staking tools also facilitates proper adjustment of the tool with respect to the roller and. to the other staking tool. Since the illustrated machine is especially adapted to the staking of skins or other pieces of leather having both a grain and a flesh side, it is important that the staking tool which engages with the grain side in folding the skin over the sharp edged staking tool snould not work any injury to the grain surface. Hence. the illustrated grains contacting staking tool is provided with an operative edge which is considerably more rounded than the operative edge of the other staking tool.

As heretofore constructed, staking machines have been provided with means for adjusting the staking tools to the thickness of the work. In all such cases, however, adjustment for thickness has always been a difficult matter with little likelihood of suiting the staking pi sure exactly to the requirements of wan ying so much in thickness as does leather. It is an important feature of the resent invention that in addition to the adjustment which may be secured through proper manipulation of adjusting devices associated with the staking tools, there is also provided an automatic adjustment of the tension of the staking operation, the staking tools adjusting themselves to a substantial range of variations in the thickness of a skin and yielding to a predetermined maximum resistance, thus eliminating danger of overstretching the thicker parts of the skin and of tearing the skin where perforations or other defects occur. Furthermore, the illustated construction comprises improved means for varying the tension, and hence the severity, of the staking operation for skins of different grades which comprises a member arranged for operation by the operator, at any and all times whether the machine be running or not, for controlling the force of the staking operations so that the effect of the operation on the work may be lessened or increased instantly in accordance with the judgment of the operator. In the construction shown this manually controled means comprises a knee lever having connections for raising or lowering the guideway which controls an eccentric operating to vary the position of the carrier of one of the staking tools with respect to the other.

The invention resides further in a staking machine organization in which the closing movement of the staking tools upon the work takes place much more quickly than in any known prior construction, the purpose being to have the work gripped promptly at the beginning of the operative stroke of the staking tools, thus providing a very efiicient mechanism for operating on small skins and on the tabs and various other projecting portions of skins. \Vhile operators may adjust themselves to the slower closing of the staking tools in prior constructions, the improved means for securing prompt gripping of the work at the very beginning of the operative stroke of the staking head has the effect of facilitating greatly the work of the operator in staking skins of all sizes, including particularly those having many tabs and great irregularity of outline.

Other features of the invention and novel combinations of parts will be described in the specification and pointed out in the appended claims.

In the drawings Fig. 1 is a view in side elevation of a staking machine disclosing one embodiment of the invention;

Fig. 2 is a similar view on an enlarged scale showing certain of the parts in section, the table being removed on the near side the better to disclose the operating parts.

Figs. 3, 4 and 5 are views of the staking instrumentalities with. certain portions of their operating means shown in side elevation, a part of the work supporting table being broken away as in Fig. 2;

Fig. 6 is a view on an enlarged scale of the curved staking tool with its mounting;

Fig. 7 is a View lookin from the left in Fig. 6 and showing certain of the parts in section;

Fig. 8 is a detail of the guiding slide for the carrier upon which the staking tools are mounted;

Fig. 9 is a detail front view showing the carrier and its relation to the guideways which support and guide the carrier;

Fig. 10 is a plan view from above of the manually operable controlling member by which the tension of the staking operations may be regulated;

Fig. 11 is a detailed view of the lower staking blade or tool, and

Fig. 12 is an edge View of the tool shown in Fig. 11.

In the illustrated machine there is provided a table 14 1 and 3) for supporting the work the table being preferably strengthened by cleats or other reinforcing members 16. Carried at the front end of the table is a cylindrical member or roll 18 which is normally secured against rotation but is adjustable so that new surfaces can be presented for engagen'ient with the work when other surfaces become worn, the purpose of the roll being to present a curved friction surface against which the work may be pressed by the opera tor. Usually the operator wears a pad on the body so that while leaning forwardly the pad is pressed against the work where the latter passes over the roll. Supporting the table 14 is an upper part of a frame 20 which supports also the other parts of the stakingmachine instrumentalities. As shown, pa; icularly in Fig. 9, the upper part of the frame 20 comprises two members 22 spaced rather widely apart from each other and each provided with a groove 24. Secured to the top surface of each member 22 is a plate 9.6, the inner edge of which overhangs the groove 29; whereby a guideway is provided for a longitudinal edge of a. carrier 28. It will be understood then that the carrier 28 is suppehed in the grooves or guideways 24 for longitudinal reciprocation thereni by means that will hereinafter be described. Preferably, and as shown, the plates 26 are secured in place by means of bolts 30 which may be loosened to permit of adjustment of the plates through proper manipulation of screws 82. the bolts 30 being again tightened to hold the plates 26 in adjusted position.

For reciprocating the carrier 28 there is provided power means comprising a connecting-rod l0 (Figs. 1 and 2) pivotally connected at one end to a crank 42 which is secured to a shaft 44, the latter being driven by power furnished in any desired or well known manner as, for instance, by a belt pulley as secured to the shaft 4A and arranged to be driven by a belt from a line shaft. At its other end the comiiccting rod 40 is fixedly mounted on a bar (Figs. 2 to 5 inclusive) which turns in bearings in two downwardly projecting arms 52 fixedly secured to or integral with the carrier 28, the rod or bar 5 being mounted rotatably in the ends of the arms 52. Pivotally mounted on the same bar 50 is a cam member 5a: which, in the construction shown, is provided with an elongated slot 56 adapted to receive a bolt 58 secured to the adjacent end of the connecting-rod 40, Upon loosening the bolt 58 the cam member 54L may be adjusted about the center of bar 50 and then secured in adjusted position upon tightening the bolt 58. By this provision for ac justment oi the cam member 5st it is possible to secure in connection with other devices which will be hereinafter described the requisite accuracy in the adj stmeit and ope'ation oi the staking instilmentalities.

Secured to the upper suria 28 IS a standard 60 havin a csdiy ch rected arm portion 53 to which oolteo a beam 64 preferably of wood gi e a certain amount of yield or flexibility in the beam Bolted to the forward end of beam is yolre member 66 provided with to): arrying a curved staking member or tool 68, the operative edge of which is considerably more rounded than the operative edge oi the other staking member hereinafter described. As shown most clearly in Figs. 6 and T, the yoke 66 comprises two downwardly extend ing arms 70 provided at their lower ends with bearings for a shaft 72 having rigidly secured thereto a pressing member or roller 7-ihaving wrapped around its cyli drical surface a felt covering material designed to ongage, with a certain amount of -friction, the work as the latter passes in engagen'ient with the roll. 7%, the curved staking member or (38, and with an inclined staking tool or blad member 69. As shown, the end 0:" he shaft T y secured thereto and adapted to be yic dingy by a brake member pivoted at 82 and having a curred portion for engaging substantially one half or the cylindrical surface of the collar 78 in braking action under pressure exerted by a spring 84: which is eng and with an upwardly extending arm 88 or the brake member 80, means being provided, as by an adjustable bolt 90, for varying the tension oi": the spring 84 in a manner that will be readily understood upon inspection of: the drawin s particularly oi Fig. 6.

'52 carries collar 78 rig The purpose or iii oral-1e is to prevent the pressing member or roller 74 from turning too readily, it being especially desirable that a certain definite maximum amount of gripping action on the work should take place while all portions the skin are being treated. In other not i i, i

w lllQ the stalrii tools were operating upon portions of the sh at a considerable d irom the edge in line of oocration.

For moving the curved staking tool 68 into and out of co-operative relation to the ther staking tool 69, it is mounted, in th construction shown, in a pair of hell crank levers 53 i one adjacent to each end of the shaft 72. Preferably and as shown the bell crank levers are not pivoted directly upon the shaft 72, the purpose beingto provide an aejustable connection between the curved staltingmember or tool 68 and its ultimate support, t 1e shaft C 2. Pivoted upon boss 98 extending inwardly from he arm 70 is a link 100 which receives rotatably in a bearing at its upper end one end of a sha t 102 the middle portion of which engaged rotatabl by a bearing 10-1- at the front end of a rod 106 which is reciprocated means which will hereinaitter be descril ed to cause a rocking movement of the staking member or tool 68. As shown, the middle portion of the bell crank lever 9t has an elongated opening 109 to loosely over a boss 110 extending laterally from the boss 98, set screws 112, 114: being employed to ad- 7; 1st the bell crank 94: on the boss 110. It will be clear that by means of the bolts 112, 114 the staking member or tool 68 may be adjusted inwardly with respect to the a surface of the roll 74 and also with respect to the second staking tool which will hereinafter l described. for the ends of the shaft 102 also prov i d in the upper ends of 1e bell cr nits i For cans in the other ends oi the bell or ii: levers 9% to grip and securely hold the curved staking tool 68, a bolt or red 1520 is passed thi the free ends of the bell cr Al: levers 94L eiternal to the member or tool so that upon tightening the nuts upon the ltolt or rod 120 the opposite ends of the staking tool are securely clamped to hold the tool rigidly in place in grooves on the inside surfaces or the bell crank levers 94. The curved tool 68 is struck about a center eccentric to the center of the shaft 72 so that it is spaced wider, with respect to the roll 7%, at its upper edge than at its lower edge to clear any wt material that might get in between the tool and the roll. As before stated the rod 1.06 is rcciprocarted to ca so rocking movements oi the curved staking tool 68 and for this purpose the other end of the rod 106 is pivotally connected to the upper end of a lever 122 (Figs. 2 to 5 inclusive), the other end of which is rigidly connected to a short shaft 124 supported by spaced projections 126 (Figs. 2 and 5) from the lower surface of the carrier 28, the shaft 124 being rotatable in its bearings. Secured to the shaft 124 is a second lever 12 having a roll 130 for engagement with portions of the cam member 54, a spring such as a leaf spring 132 being employed for holding the roll 130 constantly in contact with cum surfaces on the cam member 54. If desired a oiled spring 133 (Fig. may be employed to supplement spring 132, since spring 133 can be more readily adjusted as to tension. \Vhen the cam member 54 operated to ca .se the high point 134 thereof to engage with the roll 130 the rod 106 is moved to the left in Figs. 3, 4 and 5 and held for a time at the extreme limit of its movement in this direction so that the curved staking tool 68 is ma aincd in operative position during the wor U r. of the staking tools 68 and 66. Preferably, and as shown, the rod 106 has inter; a point intermediate between its 01 ing portion or member indicated by the reference character (Fi 5). Upon reference to Fig. 2 oi. .e or. I

ings it will be seen that this yielding connection 140 comprises a casing 142 (Fig. 2) which is conveniently screwed upon a ca 144 screw-threaded on the rod portion At its other end the casing 142 has a head p rtion which is perforated to receive the adja ent end 148 of the rod 106, the end of the rod carrying a piston member 150, spring 152 being interposed between the piston 150 and the cap 144 and under tension normally to maintain the piston 150 in contact with the adjacent end of the casing 142. It will be readily understood upon inzspection of the drawings that compression of the spring 152 will permit yielding of the curved staking tool 68 in a direction away from the adjacent surfaces of the roll 7 4 and of the lower staking tool 69 hereinafter to be described. The spring connection just described makes provision for considerable self-adjustment of the staking tools to variations in the thickn ss of the skins being operated upon, and particularly variations in thickness of different parts of the same skin, and provides for a nice ad justment of the pressure of the staking operation such as cannot be secured even by accurate adjustments of the staking tool; themselves. There is thus provided a saf device to prevent tearing of the work or excessive strain or harshness of treatment.

For co-operation with the upper curved staking tool 68 there is provided, as already stated, a second staking tool 69 shown in detail in Fig. 11. This staking lade 69 has a curved operating edge considerably sharper (Fig. 12) than the corresponding edge of the staking tool 68 and yet not so sharp as to operate as a cutter but rather as a tool which will insure a very abrupt bending of the portions of the skin as they pass over this edge. In other words, the blade will operate as a scraper on the skin and have the eifect of softening the material through the bending and stretching of the fibres of the skin, it being understood that this blade operates directly upon the flesh side of the skin while the upper curved staking tool 68 is in engagement with the grain side of the skin to bend the skin sharply over the blade. Conveniently the blade 69 is mounted securely upon an angle iron (Fig. 2) being preferably bolted thereto as by bolts 162. Preferably, and as shown, the angle iron 160 is adjustably connected to the forward end of a lever 164 by means of a second angle iron 166 which is securely bolted to the front end of the lever 164 and which providesa substantially vertical attaching face for the angle iron 160. Upon loosening bolts 168 the angle iron 160 can be adjusted vertically through proper manipulation of set screws or setting bolts 170 after which the bolts 168 may be again tightened to hold the angle iron 160 in adjusted position. As will be clearly understood from an inspection of the drawings accuracy in the position of the staking tool 69 may also be secured by adjustment upon the angle iron 160 prior to tightening of the bolts 162.

Power means is provided for moving the staking tool 69 toward and from the staking tool 68 so that the skin undergoing operation may be operated upon and then released to permit of shifting of the skin between suceessive staking operations, the said power means in the construction shown comprising the cam 54 already mentioned which has a cam portion for engagement with a roll 182 on the lever arm 184 of the lever 164 which turns pivotally on a shaft 186. For holding the roll 182 in contact with the cam member 54 there is provided a spring 185 which presses against the lever 164. It will be clearly understood that when the roll 182 is engaged with the high part of the cam 180 the staking tool 69 is in full working cooperation with the staking tool 68 at which time the roll 130 is held stationary on the high part of the cam 134, as before described (see Fig. 5 of the drawings).

Since skins for glove leather and for other purposes vary considerably in thickness and in density so that it is quite common to grade even these relatively thin skins into a number of grades, it is desirable to provide means under the control of the operator for adjusting the force of tension of the staking operation to suit the thickness or density grade of skins being operated upon, in addition to the automatic adjustment or accommodation provided by the spring connection 140. For this purpose applicant has provided a novel construction by which the staking blade 69 may be adjusted relatively to the roll 74:, bringing it closerto the roll while thinner skins being operated upon. This mechanism con'ipidses a member 190 which constitutes a guide member extending longitudinally of the machine, that is, from front to rear in parallelism with the path of moveof the carrier it to be understood that this guide member is movable only in a vertical plane so that the roll 192 travels along the groove in the guide member 190 during reciprocation of the carrier 28. This roll 192 is at the end of a short lever 19% on the other end of which is an eccentric 196 securely attached to the lever or integrally formed therewith. Upon rocking the lever 19-ithe eccentric 196 is shifted to raise or lower the fulcrum point of the lever 16st whereby the lower staking blade 69 is adjusted. For raising and lowering the guide member 190 the e is provided a manually controllable mcu'iber having connections with the guide member 190 whereby the latter is n'iaintained always in a horizontal plane during its movements of adjustments. In the construction shown this manually controllable means comprises a segmental wheel 200 2 and 10) which carries members 202 which may serve as handles or as members to be en aged by he knee of the operator, the segmeinal mem r 200 being connected by spokes 20-1 to a i'cal shaft 206. Preferably, and as shown, the nub 208 has its upper surface provided with a cam 210 which co-operates with a complemental surface 212 which faces drnvnwardly on the lower surface of a fixed block 214 carried by a standard 216 fixed to the frame of the machine. Upon rototing the shaft 206 in the direction of the arrow in Fig. 10, the co-operation of cam surfaces 210 and 212 results in forein the shaft 206 in a downward direction iereby the lever 218 is rotated about its pi ot 220 by reason of the engagement of the shaft 206 at its lower end with the arm 222 of the said lever. At its other end the lever is connected by a link 22% with a projection 226 securely fastened to or integral w th the guide member 190 so that upon depressing the iirm 222 of the lever 218 the forward end of the guide member 190 is lifted. In order that both ends of the guide member 190 may be lifted at the same time and in equal amounts there is provided a pair of bell crank levers 228, 280, duplicates of each other in size and shape and pivoted at 232 and 28-1,

-ectively, on the frame of the machine. 228 is pivotally connected to the pivot pin which serves as the connection also of the link 224 to the projection 226. Similarly the lever 230 is pivotally connected to the projection 288 which is integral with or securely attached to the guide member 196 adjacent to the rear end thereof. Since the bell crank levers 228, 230 are connected by a link 240 they are constrained to move together and in equal amounts thus insuring that the guide member 190 will be maintained in parallelism with the guideway for the carrie 28 while it is being lifted or lowered.

At the forward end of the groove or guideway 2st for the carrier 28 there is provided a plate 250 8 and 9) which is secured to the frame member 22 by means of a dowel pin 252 and a screw 254, there being one of the blocks 250 in each guideway 24, the purpose of the blocks being to provide stops which would limit the forward movement of the carrier 28 in case of accidental overthrow of the carrier 28, so that no injury to the operator could take place under any conceivable circumstances due, for instance, to breakage or disconnection of the operating parts for the carrier.

In operating with this machine a skin is placed in extended condition upon the table i i and moved rearwardly as the carrier 28 moves rearwardly, the skin being held by the hands of the operator on each side of the relatively wide slot between the frame memhers-22. When the skin has been moved far enough into the machine in the judgment of the operator it is held in position against the pull of ti e staking tools by the body of the operator pressing the skin against the cylindrical member or roll 18. At the rear end of the stroke of the carrier 28 the staking tools 68 and 69 are opened widely apart (as shown in Fig. 3), and upon forward movement of the carrier these tools remain in spread apart condition so that they may be closed upon the skin at substantially the extreme limit of the forward movement of the carrier. These movements of the carrier and of the staking tools are illustrated in Figs. 3, t and 5 of the drawings, wherein the carrier with the staking tools in spaced relation is seen in Fig. 3 with the carrier a little to the rear of the middle point of the path of its rectilinear travel. in Fig. t the carrier has nearly reached its limit of forward movement and the staking tools are moving toward each other, and in Fig. 5 this closing or gripping movement of the tools with respect to the skin is completed, the closing and opening movements of the staking tools being caused by rocking movements of the cam 5-l. At the instant that the staking tools close upon the skin the carrier 28 is started on its backward trip, whereby both surfaces of the skin are operated upon simultaneously by the staking tools throughout a stroke which carries the tools nearly the full length of the table 14 from the position shown in Fig. 5 to the end of the table at 260, at which point the staking tools separate to release the skin and to return in spaced relation to each other to grip the skin in another place as it is shifted by the operator. Upon inspection of Fig. 5 it will be observed that the skin S is bent sharply around the edge of the staking tool 69, just as the skin is bent over the blade in knee-staking, through co-operation of the curved staking tool 68 and the roller 74, and it will be further observed that the staking blade 69 is at such an an le that, during its operative stroke, the srin continues to be drawn over its edge at the same acute angle, the movement of the staking blade being in such a direction however, relatively to the bent portion of the skin that no cutting or tearing of the skin takes place. The flesh side of the skin is stretched and scraped and flexed so as tosoftenandenlargetheareaoftheskin. This takes place under yielding tension, as provided for in the construction of the machine by the flexibility of the beam 64 and by the yielding features of the connection 140 in the rod 106. At the same time that the staking tool 69 is operating on the flesh side of the skin S the curved staking blade 68 is contactin 1 with the grain side to assist in stretching thls side, between the holding member or roll 18 and the constantly changing point of grip of the staking tools, to substantially the same extent that the flesh side is stretched. Since the grain side is on the outside of the bend in the skin over the blade 69, it is stretched fully as much as the flesh side which receives harsher treatment since it is in contact with the shar blade. \Vhile it is true that the flesh side is operated upon by the blade 69 which gives it a severe stretching and scraping it is to be remembered that the flesh side of the skin is more resistant to stretching than is the grain side so that it needs this harsher treatment. The angular relationship of the two staking tools and the staking edge of these tools have been so constructed and adjusted that substantially the same amount of stretching is secured upon the grain and flesh sides, thus providing for the most desirable results in that there is no tendency to separate the grain side from the flesh side through greater stretching of one as compared to the other. The grain side bent over the sharp blade 69 is thoroughly softened and stretched, and has its pores opened, without contact with the tool that does it, thus avoiding damage thereto. Through the fine adjustments provided for the staking tools, and the control of the tensioning of the tools both automatically and manually through the knee lever 200, 204, there is provided means for staking light skins which enables the machine operators to do more and better work than can be done by knee-stakers. At the same time the operation of the machine involves so little effort that the laborious work heretofore incident to the staking of light skins is substantially eliminated. Applicant believes himself to be the first to provide a machine adapted to accomplish this work.

Having described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a machine of the character described, a staking member for operating on the flesh side of a skin, a roller for co-operation with the staking member, and a member for en gaging with the grain side of the skin and movable relatively to the roller and to the staking member for bending the skin sharply over, around, and under the edge of the staking member.

2. In a machine of the character described, a staking blade having an inclined operative portion, an operative stroke in a direction opposite to the direction of the inclination of said operative portion, a roller for cooperation with the blade, and a member movable with respect to the blade for folding the work down over the edge of the blade.

3. In a machine of the character described, a blade for operating on the flesh side of a skin, a. roller for pressing the skin against the blade and a staking member spaced with respect to one side of the blade when the member and blade are in work-receiving position and movable about the axis of the roller to carry its operative edge over the edge of the staking blade and inwardly toward the other side of the blade to bend the skin sharply over the edge thereof.

4. In a machine of the character described,

a staking blade having a relatively sharp edge for operating on the flesh side of a skin, a roller for holding the skin against the blade, and a staking member having a rounded edge for engagement with the grain side of the skin and having a movement relative to the roller to carry its operative edge over and around the edge of the staking blade so that the skin is bent over edges of both the member and blade whereby both sides of the skin are simultaneously stretched to substantially the same extent.

5. In a machine of the character described, a staking blade for operating on the flesh side of a skin, a. member for pressing the skin against the staking blade, and a member movable relatively to the pressing member for engaging with the grain side of the skin for bending it sharply over the edge of the staking blade.

6. In a. machine of the character described, a staking blade having an inclined operative portion and an operative stroke in a direction opposite to the direction of the inclination of said operative portion, a member for cooperating with the blade in stretching the a member for operating on the flesh side of a skin, a member for pressing the skin against the first-mentioned member in cooperation therewith for stretching the skin, and a staking member movable in a curved path about the pressing member and toward and over the edge of the first-mentioned member to bend the skin sharply thereover.

8. In a machine of the character described, a staking blade having a relatively sharp et'ige for operating on the flesh side of a skin, a roller for holding the skin against the blade, and a staking member having an edge more rounded than the edge of the blade for engagement with the grain side of the skin, and having a pivotal mounting eccentric to the axis of said roller so that operative movement thereof about said pivotal mounting carries its rounded edge down over and in toward the edge of the staking blade whereby the skin is bent sharply over the edge of the staking blade.

9. In a machine of the character described, aroller having a friction surface for contactwith the grain side of a skin, a staking blade for operating upon the flesh side of the skin, and member mounted to turn with respect to the roller during each cycle of the ea for bending the skin shar dv over the o tire or. go of the staking blade.

10. In a machine of the character described, a roller having a friction surface for engagement with a skin, a staking blade for engaging another surface of the skin, a brake for the roller so to secure resistance to the passage of the skin over the surfaces of the roller and the staking blade, a member ll'lOVitblG for folding the skin over the edge of the blade, at supporting member upon which the folding member is mounted, and means independent of the supporting member for tensioning the holding member so that the la oer may yield automatically to variations in the thicl-zness of the work and to other excessive resistances such as may be caused by perforations in the work.

11. In a machine of the character described, a roller having a felt-covered fricfor contact with the grain side tion su race of a skin, staking blade for operating upon 'L-he flesh side of the skin, a member having 1. pivotal mounting eccentric with respect to the center of the roller and operative during movement about the pivotal mounting for bending the skin sharply over the operative edge of the staking blade, and means for adjustin the eccentric mounting to vary the position of the member with respect to the roller and the blade.

12. In a machine of the character described, a roller having a friction surface for engagement with a skin, a staking blade for ongagir another surface of the skin, a brake for the roller so to secure resistance to the passage of the skin over the engaged surfaces of the roller and the staking blade,

a member movable for folding the skin over the edge of the blade, a support for the fold member, means for moving the member, said moving means having a tensioned portion adapted to yield so as to secure autonatic adjustment of the folding member to var ations in the thickness of the work and to other excessive resistances s eh may no cased by perforations in the work.

13. In a machine of the character described, a sta g tool having an inclined ve portion and an operative stroke in a direction opposite to the direction of the inclination of said operative portion, a roundededge staking tool movable to fold skin over the inclined operative edge of the list-n'ientiened tool, means for movii'ig the tools toward and from each other to enwith and to release the skin, and means providing for automatic adjustment of the tools i Ih respect each other.

14. In a machine of the character described, staking tool for operating on th flesh side of a skin, a staking tool mounted 0 move dcwnwarcly and inwardly toward ion-ed staking tool so that the sharply over the edge thereof, the tools longitudinally of "retelling and softening the pern in the path of the tools, said cans coinpri an arm having a bearing directly over and closely adjacent to the firstment oned staking tool for pivotally supporting the second staking tool, and means for moving both the tools toward each other one of them about its pivotal support, to grip the work prom shy at the beginning of the operative stroke of the tools.

15. In a mach ne of the character described, a staking blade for with the flesh side of a skin, a roller for pressing the skin against the blade, means for adjusting the blade toward. and from the roller, a staking member for engaging with the side of the skin, means for mounting the staking member for movement toward and from the staking blade, means for adjusting the staking member toward and from the staking blade, and means l11( pendent of the mounting means for the staking member for securing automatic adjustment of the staking member with respect to the staking blade during he staking operation.

16. In a machine of the character described, a member against which a skin may be pressed by the operator to hold it stationary during a single staking operation, a staking blade for operating on the flesh side of the skin, a staking member mounted to move s i'nuh taneously downwardly and inwardly toward and under the staking blade so that the skin is folded sharply over the edges of both the staking blade and staking member during the operative stroke thereof, and means for moving the blade and staking member longitudinally of the skin for stretching and staking both the grain and flesh sides of the portion of the skin in the path of the staking member and blade.

17. In a machine of the character described, a pair of staking tools for engagement with opposite sides of a skin, a roller for co-operation with the staking tools, one of the staking tools being oscillatable about the roller, means for moving the oscillatable staking tool over and around the operative edge of the other staking tool whereby the skin is tolded sharply over the operative edges of both staking tools, and a carrier for the staking tools reciprocable to move the tools lengthwise of the skin while the latter is held stationary, said carrier comprising means for moving said other staking tool bodily toward the oscillatable staking tool to facilitate gripping of the skin at the very beginning of the operative stroke of the tools.

18. In a machine of the character described, staking tools for engaging opposite sides of a skin, a roller for co-operating with the tools, means for moving both of the tools toward and from the roller and toward and from each other to grip and to release the skin, and a carrier for moving the tools longitudinally of the skin while the latter is held stationary.

19. In a machine of the character described, a pair of staking tools for engagement with opposite sides of a skin, means for moving one of the staking tools over and around the operative edge of the other staking tool whereby the skin is folded sharply over said operative edge, a carrier for the staking tools reciprocable to move the tools lengthwise of the skin while the latter is held stationary, said carrier comprising a resilient arm for supporting one of the staking tools, and means for causing the tools alternately to grip and to release the skin, said means comprising a tension member so that the tools may adjust themselves automatically to the skin undergoing operation.

20. In a machine of the character describet staking tools for engaging opposite sides of the skin, means for causing the tools to grip and to release the skin, a carrier for moving the tools longitudinally of the skin while the latter is held stationary, a yielding device in the said means for permitting automatic adjustment of the tools with respect to each other during their operative stroke, and means under the control of the operator for varying the tension of the staking opera tion at any time during the staking operation.

21. In a machine of the character described, a staking tool for operating on one side of a piece of work, a staking tool for engaging simultaneously with the other side of the Work, means for moving the tools toward and from each other to grip and to release the work, a carrier for the upper tool comprising a resilient member designed to permit a relatively small amount of yielding of the tools away from each other should ercessive resistance be encountered, said means for moving the tools toward and from each other comprising a yielding device whereby the tools may adjust themselves automatically to variations in the thickness of the work and to the resistance ofl'ered by the work, and means under the control of the operator for varying the staking pressure at any time in accordance with the judgment of the operator.

22. In a machine of the character described,

staking tools for operating on opposite sides of a piece of work, a carrier for the tools, means mounted on the carrier for causing the tools to grip and to release the work, said means comprising a lever for moving one of the tools toward and from the other, said lever being provided with an eccentric mounting, a member connected to the eccentric mounting and having a roll at its free end, a guideway in which the roll travels during reciprocation ot the carrier, and means under the control of the operator for rais ing or lowering the guideway, thereby adjusting the eccentric mounting and varying the position of the tools with respect to each other whereby the tension of the stakiin operation may be varied at the will 01": the operator.

23. In a machine of the character described, staking tools for engaging opposite sides of a piece of work, a carrier l'eciplocable to move the tools lengthwise of the work while the latter is held stationary, means for moving the tools toward and from each other to grip and to release the work, said means comprising a cam having two cam surfaces thereon, levers, one for each staking tool, arranged to be operated by the cam surfaces on the cam member, a yielding connection between one lever and the staking tool operated thereby for varying automatically the tension of the staking operation, and means under the control of the operator for varying the fulcrum point of the other lever to change the relative position of the tools with respect to each other whereby the tension of the staking operation may be changed at the will of the operator at any time during the staking operation.

24. In a machine of the character described, a staking blade for engaging with the flesh side of a skin, a staking member for engaging with the grain side of the skin, means for effecting relative movement of the staking member and the staking blade toward and from each other, means for relatively adjusting the staking member and the staking blade toward and from each other, a supporting member for staking the member, and means for independent of the supporting member effecting automatic relative adjustment of the staking member and the staking blade during the staking operation.

25. In a machine of the character described,

a staking tool for engagement with the flesh side of a skin, a member for pressing the skin against thetool, a second staking tool movable toward the first-mentioned staking tool for folding the skin sharply over the operative edge thereof, means for moving the withhnd to release the skin, and a compression spring providing for automatic adjustment of the tools with respect to each other during a staking operation on the skin.

26. In a machine of the character described, a pair of staking tools for engagement with opposite sides of a skin, a roller for engaging with the skin to retard its movement with respect to the staking tools, and means comprising a spring providing for automatic adjustment of the tools with respect to each other during a staking operation on the skin. 27. In a machine of the character described, a pair of staking tools for engagement with opposite sides of a skin, means for moving one of the staking tools over and around the operative edge of the other staking tool whereby the skin is folded sharply over said operative edge, a roller for pressing the skin against one of the tools, and means for causing relative movement of the staking tools in directions toward and from each other to engage and to release the skin, said means comprising a yielding connection so that the tools may adjust themselves to variations in the thickness of the skin.

28. In a machine of the character described, a staking blade having an inclined relatively sharp edge portion for operating on the flesh side of a skin and having an operative stroke in a direction opposite to the direction of the inclination of the sharp edge portion, a member for holding the skin against the blade, and a staking member having an edge more rounded than the edge of the blade for engagement with the grain side of the skin in bending the latter over the sharp edge of the staking blade.

29. In a machine for staking skins and other light pieces of leather, a staking blade having a. relatively sharp edge for operating on the flesh side of a piece of leather, a member for holding the piece of leather against the blade, and a staking member having an edge considerably more rounded than the edge of the blade for engagement with the grain side of a piece of leather for operating thereon in bending the leather over the sharp edge of the staking blade.

30. In a machine for staking skins and other light pieces of leather, a staking blade having a relatively sharp edge for operating on the flesh side of a piece of leather, a member for holding the piece of leather against 65 the blade, a staking member having an edge tools toward and from each other to engage CHARLES F. STACKPOLE.

CERTIFICATE OF CORRECTION.

Patent No. 1,744,420. Granted January 21, 1930, to

CHARLES F. STAGKPOLE.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows; Page 8, line 128, claim 24, for the words "for staking the member" read tor the staking member; line 129, same claim, strike out the word "tor" and insert the same before the word "eiiecting in line 130; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 9th day of December, A. D. 1930.

M. J. Moore, (Seal) Acting Commissioner of Patents.

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