US2007973A - Pulling-over machine - Google Patents

Description

y B. JORGENSEN PULLING OVER MACHINE 2 Sheets-Sheet 1 Filed Dec. 21, 1955 July 16, 1935. B. JORGENSEN PULLING OVER MACHINE Filed Dec. 21, 1935 2 Sheets-Sheet 2 m "w 4 mm a, 0 g 240.. .1 6 O G i Q... 6 w 5 M m W m w A. l1 0 PO M W l I Patented July 16, 1935 UNITED STATES- PULLING-OVER, MACHINE Bernhardt Jorgensen, Beverly, Mass, assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Application December 21, 1933, SerialiNoI 703,444 v 9 Claims. (01. 124);

This invention relates to upper-pulling or pull ing-over machines and more particularly to improved mechanism for controlling the relative movement of the upper-grippingmeans and the last or form in the upper-pulling operation. Although the invention is herein illustrated in its application to the control of the side grippers in a machine of the type commonly used for pulling over uppers, the invention is not limited to side gripper control nor to an organization of the a particular type illustrated.

movements of the grippers and thus insuring that they shall exert a slow steady pull upon the upper Various expedients have been adopted or proposed'heretofore for controlling the upper-pulling movements of the upper-engaging grippers in pulling-over machines. It is well known, for example, to employ a fluid checkfor retarding the such as will have no tendency to tear or' injure it. It has been proposed to provide for automatically relieving the resistance of the fluid check at a predetermined time in the cycle of operations of the machine to' insure that the grippers when released from the upper shall be quickly retracted into positions out of the way of the overlaying and tacking'devices. It is also well known to provide mechanism including a hand lever for supplementingthe action of theupdraw springs so as to increase at will the pull of the grippers upon the upper.

In order to provide for still better control of the relative movement of the upper-gripping means and the last or form in an upper-pulling machine there is provided, in accordance with the present invention, a novel organization of controlling mechanism which, as herein illustrated, comprises a hand lever that is operable at will to cause the side grippers to exert upon the upper a stronger pull than that derived from the updraw springs, and a fluid check which is normally effective to retard the upper-pulling movement but which is so constructed and arranged andso connected with the hand lever that, upon actuar a tion of the latter to increase the pull on the upper,

the retarding action of the fluid check will be automatically relieved. In the organization herein shown the hand lever is movable in one direction to retard the upper-pulling movement to a greater extent than it is normally retarded by the 7 in response to the upper-pulling movement of the "sidegrippers and a valve normally held by a spring in position to restrict and regulate the flow of the fluid through an opening in the cylinder. As illustrated also, the tension of the valve spring and the constructionand arrangement of the operative connections between the piston and the hand lever are such that when the hand lever is moved in a direction to increase the pull on the upper, so that thegrippers are operated with greater force than that normally applied through theupdraW springs, the pressure'exerted by the 10 piston on the fluid in the cylinder will be increased sufliciently to cause the valve to open Wider and thus to relieve the resistance to the flow of the fluid through the cylinder'opening to such an extent'that the-fluidchec k will ofier little if any substantial resistance to the movement of. the hand lever and. avery sensitive and eflicient manual control of the upper-pulling movement is afiorded. i I i e 7 Further in accordance with the present invention the means for retarding the relative movement of the upper-engaging grippers and the last in the upper-pulling operation comprises novel and improved mechanism-for automatically relieving the resistance of the retarding means at a predetermined time in the cycle of operations ofv the machine to insure. a quick withdrawal of the grippers intoout-of-the-way positions when they are released from the upper. This improved mechanism, as herein illustrated, comprises a cam onthe rockshaft which is operated toswing the tacking devices inwardly into positions for the driving of the tacks, and operative connections between this cam and the valve Which'regulates-the retarding action of the fluid check, these. operative connections being constructed and arranged to open the valve wider to relieve the retarding action of the fluid check and thereafter to permit the valve spring to return the valve to its normal position. As illustrated, also, the valve-operating cam may be so constructed and so mounted that it may be quicklyand conveniently adjusted upon its shaft to varythe time whenthe automatic operation of 4 the valve takesplace. a 5

"Invention further resides in various novel combinations and'arrangernents of parts including certain particulars of construction ofthe fluid check and associated controlling mechanism all of which will now be described with reference to the acompanying drawings and pointed out in the claims.

In the drawings, 7

Fig; 1 is a view inside elevation of the upper sociated therewith at 20. As indicated the illusportion of a pulling-over machine embodying the novel features of the invention;

Fig. 2 is a view, partially in side elevation and partially in section and on an enlarged scale, of the mechanism for retarding the updraw movements of the side grippers;

Fig. 3 is a detailed view in side elevation of the cam mechanism for automatically relieving the resistance of the retarding mechanism;

Fig. 4 is a top plan view, partially broken away, of the mechanism shown in Fig. 3;

Fig. 5 is a side elevational view of a cam of modified form which may be employed to effect the automatic opening of the valve for relieving the action of the fluid check; and

Fig. 6 is a plan view, partially broken away, of

the modified cam and associated parts showing machine of a well-known commercial type hav ing a sole rest ID, a heel rest 12, and side clamps, one of which is shown at I4. In common with other machines of this type, the illustrated machine is provided also with two sets of side grippers, one set of which is indicated by dotted lines at I6, and with the usual side wipers and associated tacking devices, one of the side wipers being indicated at l8 and the tacking device astrated tacking devices include tack driver bars 22 which are raised against spring tension by mechanism that swings about a cam-operated rockshaft 24 and are subsequently depressed by spring action to drive tacks for fastening the upper to the insole and last when they are released by portions of that mechanism operated by turning of the rockshaft 24. Such turning of the rockshaft further serves to swing the tacking devices and the wipers I8 thereon inwardly over the shoe bottom just before the driver bars are released. The illustrated side grippers [6 comprise gripper jaws which are carried by gripper casings 25, the latter being connected by means of operating bars 26 with updraw levers 21. As shown, the updraw levers 2'! aremounted upon a pivot rod 28 and are connected at their rear ends to a cam-operated slide 30 through updraw I springs 32 mounted upon rods 34 on the slide 30, the springs being arranged to be compressed by the downward movement of the slide'to operate the grippers I5 yieldingly. As in other machines of this type, also, the updraw levers 21 of the illustrated machine are connected to an equaliz-' ing lever 38 which is mounted for turning movement in a block 38 about an axis extending lengthwise of the updraw levers, the block 38 being fast upon a rockshaft 40 which carries a gear segment 42 operatively engaged with a coacting gear segment 44 on a hand lever 46 which is pivoted upon the rod 28 and is arranged to permit manual control of the movements of the side grippers when desired. The equalizing lever 36 bears upon the upper edges of the updraw levers 2'! and is connected to these levers by means of cradle members 48 so that the swinging movements of the levers in, either direction are accompanied by a swinging movement of the equalizing lever 36 about the axis of the rock-. shaft 4H, the lever 36 being permitted to turn in the block 38 to accommodate itself to different relative positions of the updraw levers. The construction and mode of operationof all I of the operative parts above referred to, with the exception of the side wipers IS, the hand lever 46, and the equalizing mechanism for the updraw levers, are substantially the same as of corresponding parts of the pulling-over machine dirclosed, for example, in United States Letters Pa"- ent No. 1,029,387, granted June 11, 1912, upon application of R. F. McFeely. The side wipers are substantially the same in construction and mode of operation as corresponding parts in the machine disclosed in United States Letters Patent No. 1,409,190, granted March 14, 1922, upon application of R. F. McFeely, while the construction and mode of operation of the equalizing mechanism and the construction and arrangement of the hand lever 2-6 are substantially the same of corresponding parts disclosed in United States Letters Patent No. 1,448,742, granted March 20, 1923, upon application of Joseph Gouldbourn. Reference may be had to the above-mentioned patents for details of construction and operation of the illustrated machine not herein fully disclosed.

In the operation of the illustrated machine it will be understood that the sole rest it engages the insole to prevent the last from moving upwardly and is operated to sink the last downwardly into the upper during the upper-pulling movements of the grippers and that the heel rest I2 is moved into engagement with the heel end of the last to resist the backward strains to which the last is subjected in the upper-pulling operation. It will also be understood that upon the starting of a cycle of operations of the machine the slide 30 receives a comparatively quick downward movement from its operating cam and that, through the springs 32, the updraw levers 2'! are thereby operated to close the gripper jaws upon the upper and then to pull the upper over the last until the resistance of the tensioned upper balances the force of the springs which react to complete the pulling of the upper after the slide 3i) has completed its downward movement. The machine comes automatically to a stop with the upper under tension and upon a subsequent actuation of the starting means the side clamps I4 are swung inwardly at opposite sides of the shoe to clamp the tensioned upper to the last. Thereafter the side wipers 53 are operated to wipe the margin of the upper inwardly over the edges of the insole on the last by inward swinging movements of the tacking devices 20 which carry them, and immediately thereafter the driver bars 22 are released to drive the tacks and thereby to fasten the over-wiped upper margins to the insole and the last. The inward movements of the tacking devices and the release of the driver bars result from the turning of the rockshaft 24, as hereinbefore explained. In the course of the inward movements of the side wipers l3 and the tacking devices 20 the side grippers 16 are tripped to cause them to release the upper, whereupon the grippers are quickly withdrawn to positions out of the way of the tacking devices by means of overdraw springs (not shown) which act to swing them inwardly as they are moved farther upwardly by the updraw levers 2? under the influence of the springs 32. Subsequently the updraw levers are positively returned to starting positions by upward movement of the cam slide 30 and the grippers are swung outwardly into positions to receive the next upper.

For the purpose of retarding the upper-pulling movements of the side grippers E6 the illustrated machine is provided with a liquid check comprising a liquid-containing cylinder 5E1 (Fig.2) having iii a hollow piston 52 therein whichis caused to move downwardly in response to upward movements of the updraw levers 21. The cylinder 50 is formed within acasing 54 which isrigidly secured. by meansofiscrews 56 to the frame of the machine and-withinwhich is formed a liquid chamber 58 which is arranged to communicate with the lower portion or the cylinder 50 through a passage 60 controlled. by thecooperation of a valve t2-with a valve seat 64 at one end of'the passagefifi. Provision is. also made for communication between the cylinder 50 and the chamber 58 througha central passage 66 in. the head of the hollow piston 52 and branch passages, one: of which is shown at 68, radiating from the centrai passage 66, the flow ofliquid through these passages being controlled by means ,of a valve 70. arranged to cooperate with a valve seat. 12 iormedat-the lower end of the passage 66. The chamber 58 and the cylinder are adapted to be filled. with liquid, for exampleoil, through an.

opening M. in:a cover 15 which is secured by means of screws 16 to the top ofthecasing 54;

the opening l l;..being normallyclosed bymeans of a screw plugv it. The piston .52 is urged upfree extremity .of a curved arm M which is rigs idlysecured to a rockshaft 8t thatyis journaled w inbearings in tlle,}casi11g 5%.. Upon iact'uation.

of the rockshaft 35, the-curved armB i functions freely iroin the chamber fidthroug h the passage.

to move the piston 52 downwardly within the cylinder 56; As shown, adisk-shaped wear plate s3 is countersunk within the head of the piston to provide a suitable bearing for the end of the curved arm St. The roekshaft 36 is connected with the updrawlevers 2'5 by means comprising an arm 93 which is rigidly secured to one end of the rockshaft 85, alink 92 -.connecting the arm 99 with the hand :lever 46, and the equalizing mechanism hereinbefore; described which connects the handleverdfi with the updraw levers. Provision is thereby made for movingthe. piston 52 downwardly in response to upward movement of -the updraw levers and the side grippers. During such downward'movement of. the piston .52

the valve it is held against its seat 12 by means of a light spring 94 the upper end of which bears against thevalve iii and the lower end of which is seated upon inwardly turnedvextremities of fingers 95 which extend downwardly from the washer 82. The tension of thelight spring 94 is such that thespring will yield upon upward movement of thepiston to open thevalve 10 an amount; suificient. to permit the liquid to flow Shinto the upper end of thecylinder 58 as the updraw levers arereturned to their starting positions... a

Upon downward movement ot the piston, 52

responsivesto upward movement ofthe updraw levers derived from the updraw springs 32 the valve 62 functions to restrict the flow of liquid j from the cylinder 5?} through the passage 5B. 5 into the. chamber. til so as to retard the downward movement of the piston and, through the connections between the piston and the updraw. levers, .toretard the upward pulling movements ofthe side'gripp'ers. Provision ismade whereby. the valve 62 is ope ned farther automatically at a predetermined time in the cycle of operations of themachine to relieve the resistance ofthe fluid check to the upward movements of the grippers and whereby the valve 62 is opened forthesame purpose if and when the operator moves the hand lever .46 in a direction to cause the grippers to exert astronger pull upon the upper.

To enable the valve to be operated in this man-.

ner it is formed with a stem H36 which extends outwardly through a' bushing I92 having at its inner end external screw threads H34 in engagement with threads formed in an opening H16 in the outer wall of the chamber 58; To prevent outward leakage of liquid along'the outer side of the bushing I132 the inner side of an external flange m8 on the bushing I t2 bears against a gasket Iii! that is seated in a counterbore in the opening. Hit, the bushing being formed with a hexagonal outer portion l l2 adapted to be en gaged by a wrench for use in tightening the flange H38 against the gasket'illi. The valve stem lilll is adapted to slide freely within the bushing m2 and it is normally urged in'a direc tion tending to close the valve 52 by means of a spring I M which encircles the valve stem, one end of the spring bearing against the valve 62 and the other end of the spring bearing against the inner end of the bushing; The strength and tension oi the spring l M are such'that the spring will not yield to permit further opening of the valve 52 under the influence ofvany pressure developed by downward movement of the piston 52 in response to normal upward movement of the.

updraw levers under influence of the springs 32, but will yield toperrnit the valve to open wider so as to offer no substantial obstruction to the ilow ofthe liquid through the passage 60 when the piston 52 is, depressed in the operation of the updrawleversby manipulation of the hand lever 46 in a' manner hereinafter to be described. In order-that thevalve 62 shall function to restrict as desired the flow of liquid through the passage 6!] it is normally held retracted against the force of the spring I is in a slightly open-position, such as that shown in Fig. 2, by means of a nut H6 on thethreaded outer portion N8 of the bushing.

I02 arranged to. engage the inner flanged end of a spool or sleeve liilon the valve stem I09, the

spool I20 having internal screw threads in en- 7 gagementwith threads on the, outer portion of the valve stemand being adapted to receive between its flanges 522 the lower forked extremity I24 of a cam ac'tuated lever I26. The lever I26 is pivoted at its to an ear i353 on the casing Stand is operated automatically to open the valve 62 farther after the completion of the upper-pulling operation, as will be hereinafter explained. As shown, the nut H6 is split and provided with a binding-screw $2 for clamping it in adjusted position on the bushing i532 and. the nutis formed with a wing it'l by means of which it maybe manually turned ,to adjust the valve 62 so as to vary the of the opening between the valve and its seat 5d when the valve occupies its normal position. As shown, also, the outer flange of the spool till knurled and a screwdriver slot I36 is formed in the outerend of the valve stem to facilitate relative turning of the spool and the valve stemfor purposes of settingup adjustment of the valve mechanism. A check hut,i38 on the valve stem ii?!) is adapted to be tightened against the outer cndof the spool i2 3 toprevent accidental displacement of the spool and the valve stem fromthe'ir relatively adjusted positions. x l l During the progress of the upper-pulling operation under power the operator may find that in certain instances it is advantageous to hasten the pulling movement or he may find it desirable in order more effectively to tension the upper, either before or after the grippers have completed their normal pulling movements, to cause them to exert a more powerful pull on the upper than that derived from the updraw springs. The operator may accomplish either of these results by giving a comparatively quick backward push to the hand lever 45. This movement of the hand lever will operate through the connections between the lever and the curved arm 84 to impart a sudden downward movement to the piston 52 which will increase the pressure of the fluid within the cylinder sufficiently to compress the spring H4 and open the valve 62 wider so as to relieve the retarding action of the fluid check. This will cause the updraw springs to raise the grippers more quickly if the stresses of the springs have not already been balanced by the resistance of the upper. By means of the backward push upon the hand lever, moreover, the'force exerted by the updraw springs may be supplemented to a substantial extent by manual force to provide any desired amount of operatorcontrolled additional pulling or stretching of the upper, such stretching being substantially unopposed by the fluid cheek inasmuch as the valve 62 in the latter will be kept open by the fluid pressure within the cylinder 50 resulting from the movement of the hand lever.

The lever I20 is operated automatically to open the valve 62 to relieve the retarding action of the liquid check at a predetermined time in the cycle of operations of the machine by means comprising a cam I40 (Figs. 3 and 4) on the rockshaft 24, a cam roll I42 engaged with the periphery of the cam I40, and a rod I44 which carries the cam roll I 42. As shown, one end of the rod I44 is pivoted at I46 to the upper extremity of the lever I26 and the opposite end of the rod is forked at I08 (see Fig. 3) to embrace a boss I50 formed on the outer side of the cam I40 and is held in place by means of a flange I52 on the boss I50. The cam I40 is rigidly secured to the end of the roekshaft 24 by means of a clamp screw I54, the radial position of the cam relatively to the rockshaft being determined by means of a dowel pin I56 which extends from the end of the rockshaft into the cam.

The cam I40, as shown in Fig. 3, is so constructed that it will operate to open the valve 62 as soon as the rockshaft 24 begins to turn in the direction to swing the tacking devices inwardly toward the shoe. If desired, however, a cam of modified construction may be employed such, for example, as the cam I40a shown in Figs. and 6, wherein a substantial dwell M02) is provided in the low part of the cam for the purpose of delaying the opening of the valve 62. In order that the time when the valve is opened may be varied more or less according to the requirements of the particular work being operated upon, provision may be made for adjusting the cam I40a about the axis of the rockshaft 24. To this end, as shown in Fig. 6, the use of a dowel pin for holding the cam in place upon the rockshaft is eliminated and the cam is secured to the end of the rockshaft by means of a clamp screw I54a having a knurled head I541) by means of which the screw may be readily turned for the purpose of clamping or releasing the cam. Upon loosening the clamping screw I54a the cam I40a may be quickly and conveniently adjusted to vary the time when it shall be effective to open the valve. As shown, the cam M011 is held positively in adjusted position when the clamp screw I54a is tightened by means of a series of radial teeth I58 on the inner face of the hub of the cam I40a arranged to cooperate with corresponding series of radial teeth I60 formed on the end of the shaft 24. By appropriate adjustment of the cam 0a it is practicable to delay the time when the retarding action of the fluid check is relieved until after the side wipers I0 have engaged the margins of the upper and pressed them against the edges of the insole so that they are adapted to supplement the action of the side clamps in holding and controlling the upper at the time when the grippers are caused to release the upper.

In the use of the machine the valve 62 in the fluid check will be manually adjusted by manipulation of the nut II6 to restrict as desired the flow of liquid through the opening 60 so as to retard the upper-pulling movements of the side grippers to such an extent as may be found necessary or desirable to insure against injury to the shoe upper, having regard to the character of the upper and the strength of the updraw springs. In operation the fluid check is eiTective to retard the upward movements of the side grippers when the machine is started, and, unless the hand lever 46 is moved manually in a direction to increase the pull of the grippers upon the upper, the fluid check will continue its retarding action until the grippers come to rest or until the valve 62 is opened by means of the automatic mechanism including the lever I25 and the cam I 40 on the rockshaft 24. At any time while the upper is being pulled, the operator, by pulling forwardly upon the hand lever 46, may retard the pulling movement even more than it is being retarded by the action of the fluid check and in this way cause the upper to be stretched as slowly as may be desired for best results upon the particular shoe being operated upon. On the other hand, the operator, watching the progress of the pulling operation, may observe that the grippers, rising i slowly and steadily under the retarding action of the fluid check, may not be'properly tightening the upper over the last, and under such circumstances he may push the lever backwardly to increase the downward pressure upon the piston 52 and thereby to cause the valve 62 to yield so as to relieve more or less the resistance of the fluid check and thus permit the grippers to be raised more rapidly by the force of the updraw springs and thereby to stretch or tighten the upper more effectively. In this way, as already pointed out, the operator may manually supplement the force exerted by the updraw springs to transmit a more powerful pull to the upper in case the condition of the latter is such as to warrant such action. Moreover, after the stresses of the updraw springs have become balanced by the resistance of the upper so that the springs are no longer effective to increase the tension of the upper, the operator, by backward pressure upon the control lever 46, may manually exert such force as may be'necessary satisfactorily to complete the upperpulling operation and he may repeatedly stretch the upper in this way if desired. In all cases the operator may thus cause manual force to be applied to the grippers before the valve 62 has been automatically opened in the second stage of the cycle of operations of the machine. Such force will be substantially unopposed by the fluid check inasmuch as movement of the control lever ma- 7 2,007,973 nipulated as hereinbefore described-willb'e efi fecupper yieldingly over a last by relativemovement of said upper-gripping means and the-lash-coritrolling mechanism for said upper-pulling means including a fluid check for retarding said upper"- pulling movement, a valve for regulating the a ction of the fluid check, mechanismarranged"to beoperated manually to supplement the pulling action of said'upper pulling means, means operable at a predetermined time in the cycle of operations of the machine to open said valve to relieve the resistance of the fluid check, and other means controlling said valve and yieldableto permit said manually-operated mechanism to open' the valve through the medium of the fluid in the fluidcheck andthus to relieve the resistance of the check. V

2. In an upper-pulling machine, the combination with upper-gripping means and means for pulling an upper yieldingly over a last by relative movement of said upper-gripping means and the last, of a fluid check for retarding said upperpulling movement, mechanism including a springcontrolled valve automatically operative at a predetermined time in the cycle of the machine to relieve the resistance of said fluid check to further relative movement of the upper-gripping means and the last in the direction of pull by the opening of the valve against the action of its spring, and manually-operable means for increasing the pressure of the fluid in said fluid check and thereby opening said valve to lessen the resistance of the fluid check at the will of the operator.

3. In an upper-pulling machine, in combina: tion, upper-gripping means, operating mechanism including an updraw spring for imparting yielding movement to said upper-gripping means to pull an upper, a fluid check for retarding the upper-pulling movement of said gripping means comprising a cylinder having a piston movable therein, operative connections between said piston and said upper-gripping means for moving the piston in response to said upper-pulling movement, and a valvefor regulating the flow of fluid in said check to control said retarding action,

said valve being unairected by pressure of said fluid caused by normal movement of said piston but being operable by increased pressure of said fluid to relieve the retarding action of the fluid check, and said operative connections including a member adapted to be moved manually in one direction to supplement the retarding action of the fluid check and in another direction to sup-' plement the force applied to said piston in the upper-pulling operation and thus to increase the pressure of said fluidand thereby operate the valve to relieve said retarding action.

4. In an upper-pulling machine, upper-gripping means, automatic operating means foryieldingly effecting relative movement of said upper-gripping means and a last to pull an upper over the last, a member movable by the operator for also eflecting such relative movement to increase the force of the pull on the upper, a fluid-containing device for retarding said relative movement by resistance to flow of the fluid in said device, a

valve controlling the flow of the fluid and "so arranged that pressure of the fluid thereon tends to open it, asp ing acting onsaid valve in oppo- 's'ition to the pressure of' the fluid thereon, means "cooperating with said spring to hold the-valve normally iii apos'ition affording a restricted opening for flow ofthe fluid, said spring being yield able to permit a wider opening'of thevalve in respon'se tdsuch pressure of the fluid 'on the valve as results from movement of said member by the operator, and mechanism for also opening the valve- -independntly of the pressure of the fluid thereon. 5;Iii an upper-pulling machine, upper-pulling grippers and automatic mechanism for operating them t'opull an' upperover a last, said grippers being releasable 'from the upper and adapted to be withdrawn to out-of-the-way positions,a member movable by the operator for also operating said grippers to increase the force of the pull on the upper, a fluid-containing device for retarding the movements of said grippers by resistance to flow of the fluid in said device, a valve controlling the flow of the fluid and so arranged that pressure of the fluid thereon tends to open the valve, a spring acting on said valve in opposition to the pressure of the fluid thereon, means cooperating with said spring to hold the valve normally in a position affording a restricted opening for flow of the fluid, and automatic means for opening said valve wider to relieve the resistance to the flow of the fluid and thereby to facilitate the withdrawal of said grippers, said spring being yieldable to permit a wider opening of the valve only in response to the operation of said automatic means and to such pressure of the fluid on the valve as results from movement of said member 1 by the operator. 7

6. In an upper-pulling machine, in combination, upper-pulling grippers and means for operating them to pull an upper over a last, said grippers being releasable from the upper and adapted to be withdrawn to out-of-the-way positions, means for retarding the upper-pulling movements of said grippers, tacking devices for securing the pulled-over upper to the last, mechanism including a rockshait for moving said tacking devices into operative positions, and means includinga cam on said rockshaft for lessening the resistance of said retarding means to movement of the grippers and thereby facilitating withdrawal of said grippers after they have released the upper.

7. In an upper-pulling machine, in combination, upper-pulling grippers and means for operating them to pull an upper over a last, said grippers being releasable from the upper and adapted to be withdrawn to out-of-the-way positions, a fluid check for retarding the upperpulling movements of said grippers, a valve normally held by a spring in position to control the retarding action of said fluid check, normally retracted tacking devices for securing the pulledover upper to the last, mechanism including a rockshaft for moving said tacking devices into operative positions, and mechanism including a cam on said rockshaft for opening said valve against the tension of said spring to relieve the retarding action of said fluid check and thus to facilitate the withdrawal of said grippers.

8. In an upper-pulling machine, in combination, upper-pulling grippers and means for operatingthem to pull an upper over a last, said grippers being releasable from the upper and adapted to be withdrawn to out-of-the-way positions, means for retarding the upper-pulling movements of said grippers, tacking devices for securing the pulled-over upper to the last, mechanism including a rockshaft for moving said tacking devices into operative positions, and

means including a, cam on said ro ckshaft for lessening the resistance of said retarding means to movement of the grippers and thereby facilitating the withdrawal of said grippers, the construction and mounting of said cam being such as to permit adjustment of the cam to vary the time when the resistance of the retarding means is lessened.

9. In an upper-pulling machine, in combination, upper-pulling grippers and means for operating them to pull an upper over a last, said grippers being releasable from the upper and adapted to be withdrawn to out-of-the-way positions, a

fluid check for retarding the upper-pulling movements of said grippers, a valve for regulating the action of the fluid check, normally retracted wipers movable inwardly into positions for engaging the margin of the upper and wiping it inwardly over the insole, normally retracted tacking devices for securing the overwiper upper margin to the last, mechanism including a rockshaft for moving said tacking devices into operative positions, and means including a cam on said rockshaft for opening said valve to lessen the resistance of said retarding means to movement of the grippers and thereby to facilitate the withdrawal of the grippers, said cam being constructed and arranged to delay the opening of said valve until the wipers have engaged the upper.

BERNHARDT J ORGENSEN.

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