US1743480A - Shoe-finishing machine - Google Patents

Description

Jan. 14, 1930.

Original Filed March 20, 1925 E. J. RAY

SHOE FINISHING MACHINE 2 Sheets-Sheet 1 I 6 If-i 01 60 m' w J l I I 50 Jan. 14, 1930. E. J. RAY 1,743,430

SHOE FINISHING MACHINE Original Filed March 20, 1925 2 Sheets-Sheet 2 Fig. A74- Patented Jan. 14, 1930 rare .1 creme EUGENE J. BAY, OF BEVERLY, I'EASSACHUSETTS, ASSIGNOB TO UNITED SHOE MA- CHINERY CORPORATIGN, 0F PAT ERSON, NEVI JERSEY, A GOR-PORATION'OF -NZEW JERSEY SHOE-FIN ISHIN G MACHINE Application filed March 20, 1925, Serial No. 17,063.

This invention relates to shoe finishing machines and is herein illustrated as embodied in an edge-setting machine designed for bun nishing ,the edges of shoe soles.

F or burnishing the edges of shoe soles in the production of the better grades of Work, it has been found desirable to useedge-setting machines having oscillating tools. Such machines are found t0 develop considerable vibration, due to two -factors. The first is the tendency oi the oscillating movement characteristic of sucha tool, as it starts and stops, to induce vibration. The second is the fact that the actual movement cycle of the tool depends on the relation between the force cycle appliedto produce theoscillating movement of the tool and the frictional drag of the ,Work on the tool, as it is forced against the tool by the operator. This relation is abruptly variable, adventitious, and uncontrollable, and commonly, in consequence, such astoaggravate the tendency 'to vibration which, in addition to producing poor Work, causes undue wear on the machine.

Accordingly, one object of the invention is to provide an improved shoe finishing machine designed to operate with .a minimum of vibration in Which the driving mechanism is arranged to deliver a force cycle which can be adjusted to meet the variations inthe trictional drag of the Work on the tool to produce maximum smoothness of operation.

To this end I propose toluse a single phase induction motor to ,drive thetool for the reason that such a motor has a pulsating torque, as distinguished from the constant torque of a direct currentor three-phase induction motor, thus providing a variable energy cycle for the tool drive. I propose also to make the stator 01" this motor angularly adjustable about its central axis, at the will of the operator, in order to ,efiect the optimum relation between its pulsating torque vcycle and the particular Work condition obtaining at the time. This enables the operator .so to adjust the energy cycle of the motor to the tool-drag cycle that the maxima and minima of one ill best correspond with the maxima and minima of the other.

lVith this in View, in another aspect the Renewed November 30, 1928.

invention comprises a novel organization in which the rotary movement of an electric motor is transformed into an oscillating tool movement by means of an arrangement which ehiects adjustment of the torque cycle of the driving motor to bring it into the best relation to the motion cycle of the vibrating tool under Working conditions.

iCustomarily, because of the difference in the shape of the edge of the forepart and of the shankofthe sole of a shoe, different types of t ols are employed upon different parts of the shoe. These tools are nsually heated to a temperature ivhich makes it practically impossible ,for the operator to handle .them and obviously it is wasteful of time to require the interruption of the yibration of the tool il Order for the operator to bring another tool into operative position. Consequently it is common edge-setting machines, in order that they may be convenient to vQberate and capable of turning out a large quantity of Work, to provide a movable tool carrier in which the various tools are mounted, this tool carrier being so constructed and arran ed that it may be moved readily to bring one after another of the tools into oper ative position Without stopping the vibration producing mechanism. Furthermore, many of the tool changing arrangements Which have been heretofore devised have been so designed that the parts are not disposed in balanced relation to the center of oscillation, and for this reason sucharrangements necessarily contribute to the difficulties heretofore discussed of reducing to a minimum the Vibration and ar of the machine.

Another object of the invention is to pro,- vide an improved tool interchanging mechanism adapted for use in a shoe finishing machine of the type referred to, which will be rganized to-obviate the difliculties and disadvantages above referred to.

To this end and in accordance with an other feature of the invention the illustrated toolcarrier is mounted for rotation around the ,aXis of the power operatedshatt by means of Which the tool is given its oscillatory movement and is disposed in balanced relation thereto, and a mechanism of simplified in a tool interchanging mechanism employ-V ing the power of the operating shaft of the machine intermittently to rotate the tool carrier through half a revolution, said mechanism comprising a one-way clutch the parts of which are positively and directly connected to the shaft and the carrier respectively,

thereby to transform the oscillating move: ments of theshaft into a rotary movement of the tool carrier when desired upon the release of suitable locking means.

One preferred embodiment of the invention is set forth in the following description and illustrated in the accompanying drawings in which: 7 I

Fig. 1 is a side elevation ofa machine embodying the invention with the head of the machine shown in vertical section along the operating shaft Fig.2 is a transverse vertical section along the line 22 in Fig. 1;

, Fig. 3 is a detail section of the one-way clutch between the shaft and the tool holder taken on the line 33 of Fig. 1;

Fig. 4 is a side elevation of the head of the machine;

Fig. 5 is a vertical section along the line 55ofFig.4;and' v Fig. 6 is a perspective View of part of the tool interchanging mechanism showing the manually operated device for releasing one of the retaining latches.

The illustrated shoe finishing machine embodying my invention is a twin edge-setting machine comprising a head 10 mounted upon a column 12 with similar tool carriers 40 at opposite ends of the head, each of which carriers is provided with a tool 50 for treating the shank and-a tool 52 for treating the forepart of the sole of a shoe. .These tool car-' riers are mounted upon opposite ends of an operating shaft 14 extending longitudinally of the head and supported in suitable bearings, and the shaft is oscillated by means of a crank arm 16 connected with a link 18 surrounding an eccentric 20 which is secured to the shaft 22 of a driving motor. A properly shaped plate 24 mounted at the end of the shaft counterbalances the weight of the eccentric and is arranged to dip in the oil in a reservoir 26 in the head of the machine and transfer this oil to the operating parts in a manner well understood in the art.

It has been found by experimental trial that if the tool of an edge-setting machine is oscillated seventy-two hundred times per minute, the resultant speed of operation and effect on the shoe approximates the ideal for such an arrangement. Accordingly, I propose to use a two-pole, sixty-cycle, single phase, induction motor which, it will be understood, delivers a pulsating torque approximately synchronous with the oscillations of the alternating current. As hereinafter explained, this motor is so interconnected with the mechanism for oscillating the 7 tool carrier shaft that the torque pulses of the induction motor bear an optimum relation to the mechanical frictional drag cycle of the tool. To this end the stator 28 of the driving motor is preferably adjustably mounted in the frame of the machine, and mechanism such as a hand operated screw 30 is provided for adjusting the position of the stator through any desired range, which, however, will never need to be as much as 180 electrical degrees so that the desired relation may be easily effected. The stator 28 may be held in adjusted position by a set screw 32.

The adjustment of the relation of the power torque cycle to the tool cycle provided by the present invention is of considerable importance. The mechanical combination of a crank actuating a heavy reciprocating or oscillating object is always productive of jar and vibration, due to the necessity of stopping and starting the object at each end of its path." Further, the frictional-drag cycle exerted by the particularsort of work in the machine must be combined with the energy cycle pro vided bythe prime mover (pulley or motor) and will modify the free running tool cycle very much. Aside from the question of mechanical vibration per se, the cycle of movement of the tool over the work should be smooth. That is, there should be no discon tinuities or marked irregularities in the acceleration cycle of the tool. Consequently, the torque cycle exerted to drive the crank should be'that which will under the drag of the work produce the smooth acceleration cycle desired, or if the acceleration cycle is more or less optional, should be designed to produce the minimum of vibration.

For example, suppose the tool of the disclosed machine were desired to have a simple harmonic motion relatively to the burnished surface of the work. This motion is symmetrical in all respects with regard to the central point of the swing, which tends to balance up conditions and minimize the jar and vibration. Further, the acceleration of the tool in such motion varies gradually and continuously, and will effect smoothness of relative movement between thetool and the work. The acceleration of the tool, andconsequently the force required to produce the acceleration, is then proportional to its distance from its central position, that is, a maximum at the ends of the stroke and zero at the middle of it. In order to impress such a force on an unloaded tool by means of a crank, the torque exerted by the prime mover to drive the crank should be very large at the beginning of the stroke, should diminish to zero at the center, and should then reverse, increasing rapidly in its drag on the tool to the end of the stroke. The frictional load on the tool alters this simple energy cycle required of the prime mover very much and varies so much with different kinds and con-- ditions of work. that it becomes practically impossible to predict what torque cycle would be necessary to produce just this. or any other desired type of motion except that it will be generally a pulsating cycle.

In any case the optimum condition will be produced by some particular relation between the torque cycle of the motor, the proposed acceleration cycle of the tool, and-1 the drag cycle of the work, and in general a motor having a constant torque such as a direct current motor, a three-phase induction motor, or a synchronous motor offers no opportunity for securing this relation. Such opportunity in considerable measure is pro-- 7 vided by the use of a single-phasev induction motor, the torque of which fluctuates from zero to a maximum twice 1n each of its own cycles. The adjustment of the stator 28:, by

Inasmuch as the arrangement of the tools and the tool interchanging mechanism is identical upon opposite ends of the shaft14,

it will be suflicient to describe one of these devices and it will be understood that a similar arrangement will be found on the other end of the shaft. The tool carrier 40is rotatably mounted upon a sleeve 42 surround ing a reduced portion 43 of'the shaft. 14 and keyed thereto (Fig. and is retained inposition on said shaft by means ofv a washer 44 and a retaining nut 46. The tool carrier 40 is so designed that its parts arealways symmetrical with respect to and, therefore, in balanced relation to the shaft 14, thus serving further to reduce vibration. rier 40 is provided with projecting arms in which are mounted tool holding plungers 48" in which the tools 50 and 52 for t'reatingthe shank or the forepart respectively of a shoe are retained by suitable springs. The=plung-' ers 48 are resiliently mounted in the tool carrier 40 so that they may yield under pressure of the work. By supporting the tools This carat an inclination to the axis of the carrier it is possible to bring the working faces of the tools to the proper working position without destroying the balance of the holder. The sleeve 42 and the carrier 40 constitute the inner and outer parts respectively of a clutch the parts of which are positively and directly connected to the shaft and to the carrier respectively. Preferably this one-way clutch is of the type of the Horton clutch embodying rollers 53 which are pressed into gripping engagement with the parts of the clutchby springs 54. The manufacture and assembly of these parts are greatly facilitated by mounting the rollers 53, or any equivalent balls or similar parts which may be used, and the springs 54 within a sleeve 42 which is separately assembled and then keyed to the shaft 14.

The mechanism controlling the interchange of the tool carriers comprises a sleeve 60 (Figs. 5 and 6) which is received in a recess formed by a rearward extension 61 of the carrier 40, said sleeve being keyed-to the shaft 14 and held in position in the recess of the carrier by means of a retaining plate 62 (Fig. 1) pinned to the shaft. To provide for positively and directly interconnecting the sleeve 60 and. the carrier 40 oppositely directed pawls 64. and 66 are pivotall mounted in recesses in the sleeve 60 and spring pressed outwardly to enter cooperating notches 68 and 70 formed in the interior of the tool carrier 40. Similar notches 72 and 74arie formed in the opposite side of the interior of the carrier ready to cooperate with said pawls when the carrier has been rotated through 180" degrees to bring another tool into operative position. It will be noted from Figs. 1 and 6 that-the pawl 64 is ex tended in a direction parallel withthe shaft 14 beyond the sleeve 60 and the carrier 40 so that a portion thereof is exposed above a recess in theretaining plate'GQ. Anoper ator controlled striking finger 76 is pi votally mounted upon the frame of the machine with its outer end in position to contact with-the extensionof the pawl 64 so as to release said" pawl from the cooperating notch of the car'- rier. Connected with the striker'76' isa depending rod 78 normally held in upper position by means of a spring 80 and capable of being pulled downwardly by the operator either by the depression of a pedal (not shown) or by striking a bell crank lever 82 having a strike plate 84 at the front of the machine in convenient position for engagement by the: hand of.'. or the work held in the; hand of, the operator. A finger hook 86' of the usual form may be provided for use by the operator'in' steadying the work when it is applied tothe lower tool in the carrier:

If the machine 1s1n' motion and the carrier is locked to the shaft by means of the oscillating movements of the shaft 14 into 7 a rotary movement of the tool carrier in a clockwise direction as viewed in Fig. 5. Thus the clockwise movements. of the shaft14 are imparted directly to the carrier 40 by the gripping of the rollers 53 to lock the shaft and carrier together and the inertia of the tool carrier as it is erked along by the oscillating shaft is sufficient to avoid retrograde movement of the carrier during the reverse 7 movements of the oscillating shaft. It will be noted from an inspection of Fig. 6 that thepawl 64 will drop into but immediately ride out of the'notch 72 and that pawl 66 will drop into but will immediately ride out of the notch 68. Just as soon, however, as the pawl 64 reaches the notch 74, the pawl i 66 will reach the notch 7 2 and, acting in opposite directions, the two pawls will positively and directly interconnect the carrier andthe shaft so that the carrier again will have an oscillating movement with the other tool in operative lower position. It will be seen that the rotation of the tool holder is effected by the reaction between said holder'and' the rock shaft resulting fromethe oscillations of said shaft and that this reactive force acts always in the'same plane'and one which is normal "to the axis of the shaft.

Heat may be supplied to the tools of the finishing machine by radiation from electric units which preferably are adjustably mounted, to vary the heat transmit-ted, upon slides 92 provided with a rack for engagement with a pinion 94 having a handwheel 96 which is retained in its adjusted position by a spring 98. This, whole mechanism is mounted in a bracket 100 attached to the frame of the machine. The supply of electric current to the heating units is transmitted through leads 102 passing by way of a suitable conduit 104 to a control panel 106 having switches 108 and 110. One of these switches 'is used to control the heating units and the other switch is used to control the motor. As

will be noted from Fig. 2, these switches are preferably mounted upon an offset bracket 112 forming part of the panel 106 so that their upper surfaces are substantially flush with said panel, as shown in Fig. 2. Below the switches the panel 106 is formed witha cut-outbox 114 containing fuses 116, saidbon having a hinged cover 118. At the upper end of the panelis a bracket 120, which is utilized 'to keep the unused tools substantially up to for the support of a covered metal box 122 provided with holding sockets 124- for the receptionof'spare tools of other styles and other sizes. In this box is a heating unit 126 working temperatureiand this unit is controlled by means of the same switch which controls the heating units 90 for the tools 50. To facilitate the proper operation of the machine individual illumination is provided for each end of the machine directly above theoperating tools. To this end, as shown in Fig. 4, a standard 130 is mounted upon the head of the machine and supports an adj ustable bracket 132 carrying an electric lamp 134 which is shaded to'protect the eyes of the operator by a shade 136. It will be understood that a similar unit is provided for the other end of themachine and may be mounted upon the same standard 130. .The control circuits of the illuminating lamps and the heat- 7 ing units are made interdependent, as illustrated in Fig. 4, so that the lamps will be lighted whenever current is being supplied to the heating units. This results in'jprov'iding' a simple and compact arrangement by means of which proper illumination is supplied to the machine directly at the point Where it is. most needed and the illuminatingunit performs the double function ofsupplying light to the work and serving as a telltale toindicate that current is being supplied to the heating units. Thus if the operator is careless and leaves the machine with the electric current turned on, it will become immediately apparent to a foreman or a watchman and serve as a warning that it should be turned off.

In the use of the machine the operator will I turn the appropriate switch to supply electric current to the driving motor and, if necessary, will twirl the rotor 22 to start the motor into operation. Having turned the other switch to supply heat to the burnishing units, he will "regulate this heat by turning the appropriate handle 96 and will apply the work first to one and then the other of the tools upon the operatin shaft usin the fin er hook86 to assist i D b P him in this operation. The operation of interchanging the tools, as has'already been described, is effected by the operator either by depressing the bell crank lever 82 or bypress-' ing a foot pedal (not shown), whereupon the tools will be very rapidly interchanged by the half rotation of the tool carrier utilizing the power of the operating shaft. For reasons already brought out the: machine will have a' minimum of vibration and noise and the optimum condition may be reached by adjust ing, ifnecessary, the stator 28 of the electric motor by means of the hand operated screw 30.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent of the United States is I 1. In a machine of the class described, a mounted carrier supporting a plurality of tools, a power operated shaft for driving said tools, means including a oneway clutch for utilizing the power of said shaft to shift the carrier to interchange the tools to bring them alternately into operative position, one part of said clutch being positively connected to the carrier and another. part of the clutch being positively connected to the shaft, and means for positively connecting said carrier and said shaft to prevent interchange of the tools. a

2. In a machine of the class described, a shaft, means for oscillating said shaft, a carrier for shoe finishing tools rotatably mounted upon said shaft, a one-way clutch interposed between the carrier and the shaft the parts of which are enclosed by the carrier, a looking device interposed between the carrier and the shaft within the periphery of the carrier, and means for rendering said locking device inefiective mounted upon a fixed part of the machine.

3. In a machine of the class described, a shaft, means for oscillating said shaft, a carrier for shoe finishing tools mounted upon said shaft in balanced relation thereto, and means for locking said carrier to said shaft comprising oppositely directed pawls pivoted upon one of said elements and arranged to engage the other of said elements and means for disengaging one of said pawls to allow the rotation of the carrier with respect to the shaft in one direction.

4. In a machine of the class described, a shaft, means for oscillating said shaft, a carrier for shoe finishing tools mounted upon said shaft in balanced relation thereto, means for locking said carrier to said shaft comprising oppositely directed pawls pivoted upon one of said elements and arranged to engage the other of said elements, means for disengaging one of said pawls to allow the rotation of the carrier with respect to the shaft in one direction, and means for trans forming the oscillating movements of the shaft into a rotary movement of the tool carrier when one of the lockingcevices is released.

5. In amachine of the class described, a carrier supporting a plurality of shoe finishing tools, a power operated shaft for driving said tools, means including a one-way clutch for utilizing the power of said shaft to shift the carrier to bring the tools alternately to operative position, and means connecting the shaft and the carrier arranged to transmit the power of the shaft directly to the tool and to render said shifting means unable to utilize the power of the shaft.

.6. In a machine of the character described, a power operated oscillating shaft, a tool carrier, a plurality of shoe treating tools' mnunted 91.1 said carrier, locking means for holding said carrier in any one of a plurality of positions with respect to said shaft to oscillate the carrier and the tools with the shaft, and a one-way clutch interposed between the shaft and the carrier rendered effective by the release of the locking device to transform the oscillating movement of the shaft into a rotary movement of the tool carrier when the locking device is released.

7. In a machine of the character described, an oscillating shaft, a tool carrier mounted for rotation about the aXiS Of said shaft, locking devices each normally operative to prevent rotation of the carrier with respect to the shaft in one direction, means for re lea ing on of a ock ng device and m n for operatively connecting the carrier to the shaft to effect rotary movement of the tool carrier in the direction permitted by releasing said locking device.

8. In a machine of the character describec, an oscillating shaft, a tool carrier mounted for rotation about the axis of said shaft, looking devices each operative to prevent rotation of the carrier with respect to the shaft in one direction, means for releasing one of said locking devices, and a one-way clutch interposed between the shaft the tool carrier for transforming the oscillating movements of the shaft into a rotary movement of the tool carrier when one of the locking devices is released.

9, In a machine of the character described, a tool carrier, a power operated shaft, means for connecting said carrier to said shaft for movement therewith comprising two latches mounted upon one of said parts and operative to prevent relative rotation in opposite directions, the other part being constructed and arranged to cooperate with said latches in a plurality of positions, and means for releasing one of said latches during the oper ation of the machine whereby the tool carr er may be rotated with respect to the operating shaft into another posit on in which the latches w ll connect the carrier with the shaft.

l0. In a machine of the character de-' scribed, an'operating shaft, a tool carrier mounted on said shaft and provided with an annular member surrounding the shaft, one of said members being prQVided with oppo.-

sitely directed pawls and the other of said members being provided with a plurality of pairs of notches arranged to engage both pawls whereby upon the release of one of the pawls the tool carrier may be rotated around the shaft until the next position is reached in which a pair of notchesiengages w h a P r f traw e- 11, II a machine of the character de: scribed, an oscillating shaft, a tool carrier provided with a plurality of shoe treating tools mounted upon and surrounding said shaft, a one-way clutch interposed between the shaft and the tool carrier tending to move the tool carrier with the shaft in one direction, a plurality of locking devices interposed between the tool carrier and the shaft, each operative to prevent rotation of the tool carrier with respect to the shaft in opposite directions in a plurality of positions correof said electric motor into oscillating move-' ment of said shoe finishing tool constructed and arranged to bring the torque cycle of the driving motor into a predetermined relation to the motion cycle of the vibrating tool.

13. In a shoe finishing machine, an oscillating burnishing tool, and means for oscillating said tool comprising an electric motor constructed and arranged to deliver a pulsating force to the burnishing tool in which the'cycl'e of pulsation of the force bears a predetermined definite relation to the cycle of oscillation of the burnishing tool.

14. In ashoe finishing machine, an oscillating burnishing tool, means for oscillating said tool comprising'an electric motor constructed and arranged to deliver a pulsating force to the burnishing tool in which the cycle of pulsation of the force bears a definite relation to the cycle of vibration of the burnishing tool, and means for adjusting the said relation.

15. In a shoe finishing machine, an oscillating burnishing tool, and means for oscillating said tool comprising an electric motor having a substantially pulsating torque, said motor being constructed and arranged to deliver a pulsating force to the burnishing tool in which the cycle of pulsation of the force delivered by the motor bears a definite relation to the cycle of the vibration of the burnishing tool.

16. In a shoe finishing machine, an oscillating burnishing tool, and means for oscillating said tool comprising a single phase electric induction motor having a substantially pulsating torque, said motor being constructed and arranged to deliver a pulsating force to the burnishing tool in which the cycle of pulsation of the force delivered by the motor bears a definite relation to the cycle of vibration of the burnishing tool, the stator of the motor being angularly adjustable around the axis of the rotor, to adjust the said relation; 7

a 17. In a shoe finishingmachine, an oscillat- Y ing burnishing tool and means for oscillating said tool comprising an electric motor constructed and arranged so that its torque cycle is in strict synchronism with the motion cycle of the tool. v

18 In a shoe finishing machine, an oscillating burnishing tool and'means for oscillating said tool comprising an electric motor constructed and arranged so that its torque cycle adjustable.

19. In a machine for operatingupon shoes, an oscillating rock shaft, a carrier for a plurality of tools rotatable about said shaft, and means for transforming the oscillationsof the rock shaft into a turning movement of the tool carrier comprising a clutch of the Horton type the parts of which are arranged to grip an interposed roller.

20. In a machine for operating upon shoes, an oscillating rock shaft, a tool carrier mounted for rotation around said shaft and arranged to be secured thereto to oscillate therewith, and means for imparting rotary movement to said tool carrier when it is released from the shaft, comprising a clutch of the Horton type, said clutch lncluding a sleeve detachably secured to one of said parts and provided with rollers spring-pressed into gripping engagement with the other part.

21. In a shoe finishing machine, an oscillating rock shaft, a tool holder rotatably mounted on said rock shaft and arranged to be detachably connected thereto or released therefrom, and a one-way clutch interconnecting the tool holder and the shaft, one of said parts being provided With a recess to receive said clutch'so that the clutch is covered.

22. In a shoe finishing machine, a rock shaft, a tool holder having a plurality of tools symmetrically disposed with respect to said shaft, said tool holder being rotatably mounted on said rock shaft, means for intermittently connecting the tool carrier to the rock shaft to move with the shaft as the latter oscillates in one direction and for releasing it from the shaft as the latter oscillates in the other direcion, and areleasable means for holding said carrier in fixed position upon the shaft to oscillate therewith or releasing it so that the cumulative movements imparted to the carrier by the shaft will impart a tool interchanging rotary movement to the tool carrier when it is released from the shaft. .t

23. In a machine of the class described, a power operated shaft, a carrier supporting a plurality of tools symmetrically mounted for" rotation on said shaft, means including a oneway clutch for utilizing the power of said shaft to shift the carrier to interchange the tools to bring them alternately into operative position, one part of said clutch being positively connected to the carrier and another part of the clutch being positively connected to the shaft, and means for positively interlocking said carrier and said shaft to prevent interchange of the tools.

24. In a shoe finishing machine, a rock shaft, a holder for a plurality of tools mounted on the rock shaft, said holder being pivoted for rotary movement to bring successive tools into operative position, and means to rotate said tool holder by the reaction between it and the rock shaft due to the oscillations of the rock shaft, said reaction acting always in the same plane normal to the axis of said shaft.

25. In a shoe finishing machine, an oscillating rock shaft, a tool carrier provided with a plurality of shoe treating tools, said carrier being rotatably mounted upon said shaft and cut away to provide a recess adjacent to the shaft, a displaceable locking device situated in said recess and constructed and arranged to interconnect the carrier with the shaft for oscillation therewith, said carrier being cut away to expose said locking device, and an operator-controlled member constructed and arranged to be brought into contact with said locking device to release the carrier from the shaft so that it may be rotated to bring another tool into operative position.

26. In a shoe finishing machine, an oscillating rock shaft, a tool carrier mounted for rotation around said shaft and arranged to be rcleasably secured thereto to oscillate therewith, and means including a friction gripping device for interconnecting said tool carrier with a source of power whereby to rotate the tool carrier to bring another tool into operative position when the carrier is released from the shaft.

In testimony whereof I have signed my name to this specification.

EUGENE J. RAY.

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