US1356516A - Pulling-over machine - Google Patents

Description

I. A. COOK.

PULLING-OVER MACHINE.

APPLICATION FILED MAR/14, 917.

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max 727a Patented Oct. 26, 1920.

UNITED STATES PATENT orrrc u,

IRVING A. COOK, OF LANCASTER, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, T0

UNITED SHOE MACHINERY CORPORATION, OF

PORATION OF NEW JERSEY.

runmne-ovnn MACHINE.

Specification of Letters Patent. Patented O t 26 1920 Application filed March 14, '1917. Serial m5. 154,817.

To all whom it may 0012 cam:

Be it known that I, IRVING A. COOK, a citizen of the United States, residing at Lancaster, in the county of Fairfield and State of Ohio, have invented certain Improvements in Pulling-Over Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures. w

This invention relates to machines for use in the manufacture of boots and shoes, and particularly to machines for pulling the shoe upper into conformity to the contour of the last. An important object of the invention is to render machines of this class readily adaptable to the different conditions presented by right and left crookedclasts with a minimum of attention or loss of time on the part of the operator. V

Pulling-over machines, as commonly constructed, include grippers for engaging and pulling the upper at opposite sides of the forepart of thevlast and a gripper, or grippers, for pulling the upper at the toe, together with a heel restwhich determines the position of the heel end of the last. It is important for the best results inthe upper pulling and fastening operationsthat the toe gripper engage and pull the upper in substantially symmetrical relation to the opposite sides of the toe of the last. In operating with right and left crooked lasts, however, in which the angular relatlon-ot the forepart and the heel part is opposite in the two lasts of a pair, there is a tendency for the toe end of the last in the pulling over operation to be displaced to one side or the other of the toe gripper in such man- 'ner that the upper may not be pulled symmetrically and evenly at the toe and in some classes of shoes .the subsequently driven toe tack may be unduly displaced to one side or the other of the last. In order to avoid these conditions various adjustments of the toe or side grippers or of the shoe positioning instrumentalities. have beenproposed, but such adjustments, where used. have required a considerable amount of the operators time and resulted in a sub stantial decrease in production.

p This invention aims to provide a construction adaptable to the different condiside. grippers in such manner as to permit them to be moved together laterally of a shoe by pressure of the work or ofthe operators hand against one of them without them. It is contemplated in the use of this construction that the lateral. position of the toe gripper may remain consta'nt, although the invention in its broader aspects isnot thus limited;

any shoe PATERSON, NEWJERSEY, A (703- substantially altering the distance between and with this arrangement the operator is enabled to present to the machine in the proper relation to both the side and the toe grippers, such change of position of the side grippers as may be necessaryfor anyparticular shoe effected simply by pushing;

being readily them transversely of the machine before or during the presentation of the shoe. The

side grippers may have their usual function, under the influence of overdraw springs, of drawing the edges of the upper over the margin of the last bottom prior to the tacking operation; and as applied to a well known type of machine in which the overdrawing movement of the grippers is controlled by a wedge which is movable sub- 7;

sequently to spread the grippers to shoe receiving position, this feature of the invention has been embodied 111 a construction including a wedge which 1s laterally movable to permit the movement of the side In grippers transversely of the machine. the construction shown the wedge is pivoted for lateral movement the extent of which is limited to determine the correct positions of the side grippers.

The invention provides, as afurther feature, means for normally maintaining the side grippers in one lateral position, as for operating upon one of the shoes of a pair,

while permitting them to be readily moved laterally into adifierent position to operate.

for example, upon the other shoe. The op erator is thus afiorded assurance as to the position of the grippers when the machine has come to rest after its operation upon a draw springs which are slightly out of balance. These springs act to position the side grippers laterally in the machine at a time when no substantial frictional resistance is offered to their action and therefore a slight difference in strength between the spring on one side and the spring on the other side serves to position the grippers automatically on that side of the machine on which the weaker spring is located, as for example to position the grippers always automatically to receive a left shoe. The springs may be so nearly balanced that a very small force is required to move the grippers to. the opposite side of the machine into position to receive a right shoe, and in practice an operator quickly learns to do this by pressure of each right shoe against the gripper acted upon by the stronger spring, the weaker spring of course assisting him in effecting this shifting movement of the grippers. The unbalanced overdraw springs are, of course, operative to draw the edges of the upper over the margin of the last bottom in the usual manner, and the purposes of the invention are effectively served by the use of such springs in combination with. a

laterally movable wedge such as above de-' scribed. A part of the advantage of this invention may be obtained by the use of this wedge with balanced overdraw springs, in which case the operator will always push the shoe laterally against the grippers to in sure the correct position of the grippers for each particular shoe. but I prefer to use the unbalanced springs in view of the saving of time which is thereby effected.

The features of. the invention will now he more particularly described with reference to the accompanying drawings and will then be pointed out in the claims. The invention'is illustrated in its application to a well known type of pulling-over machine such as shown and described in United States Letters Patent No. 1.029 387 granted on June 11,1912, upon the application of R. F. McFeely, and only such portions, of the machine as it is necessary to refer to for an understanding of the invention are shown and. will be described herein in detail;

In the drawings,-

Figure 1 is a perspective view of gripper controlling mechanism equipped with the laterally movable wedge of this invention,

' and partly in section,

. partly.

, per bears.

Fig. .Zisa plan view of the mechanism shown in Fig. 1 and with other portions of thema chine including the unbalanced overdraw springs with which this mechanism is intimately associated shown partly in plan and Fig. 3 is a'view partly in elevationand in sect-ion showing the side grippers and associated parts of the machine, and illustrating by full and dotted lines different positions of the side grippers.

The machine comprises side grippers 2 for engaging and pulling the upper at opposite sides of the forepart of the last and a toe gripper 4 for pulling the upper at the toe. Operative movement is first imparted to the several grippers to pull the upper, after which the side grippers are moved laterally toward each other and the toe gripper is moved rearwardly to draw the upper over the margin of the sole or innersole on the last bottom, as described in the prior patent above mentioned, the grippers being. guided in their overdrawing movement by guideways in a frame bracket 6. Overdraw springs 8 are effective with a constant tendency to force the toe gripper rearwardly and are operative to impart the overdrawing movement to this gripper when such movement is permitted by the operation of a slide 10 which has a roll 12 at its front end against which the toe grip- Mounted for movement with the slide 10 is a wedge block 14 which is engaged on its opposite sides by rolls on levers 16. these levers having at their front ends swivel blocks 18 against which the right and left side grippers are held by overdraw springs indicated at 20 and 22 respectively. these springs performing the same function for the side grippers as the springs 8 for the toe gripper. The block 14 thus acts as a side gripper positioning or spacing memher for holding the side grippers apart and controlling their movements laterally of the shoe. It will be understood that the slide 10 is moved forwardly to spread the several grippers and thus to position them for the receptionof the work, and is moved rearwardly to permit the overdraw springs to force the grippers inwardly over the shoe bottom; the position of the toe gripper being determined directly by the slide and thefpositions of the side grippers depending upon the relation of the wedge block 1 4 to the levers 16. The slide 10 is reciprocatod in time relation to other operative movements of the machine, and may also be adjusted relatively to its operating means to change the positions of the grippers for shoes of different sizes bv mechanism associated with a hand wheel 23 and a rack 24:.

Patent No. 1,029,387. Similarly to the construction shown in said patent, the machine is also provided with means for adjusting the wedge block 14 relatively to the slide 10 to vary the distance between the side grippers without changing the position of the toe gripper, this mechanism comprising a screw 25 which is threaded in a block 26 on the lower side of the wedge'block l4 and is provided with a head 28 in engagement with lugs 30 on the slide to restrain the screw from lengthwise movement and cause the wedge block to be adjusted along to the slide by turning movement of the screw.

In carrying out the objects of this invention the wedge block 14 is pivoted at 32 to the block 26 and has tapering channels on its upper and lower sides to permit it to swing relatively to the slide 10 and the block 26 a limited distance transversely of the machine, the limits of the movement being determined by engagement of the slide 10 with the sides of the upper recess or channel in the block 14:, the slide thus serving as a stop for the block. It will be evident that this construction permits both side grippers to be swung together a limited distance transversely of the machine and relatively to the toe gripper without materially altering the distance between the two side grippers. Such movement of the side grippers may be effected by pushing against either one of the grippers in the direction of the desired movement, thus causing the wedge block 1% to swing on'its pivot while the springs 20 and 22 continue to press the grippers inward as far as permitted by the wedge block. For operating with right and left crooked lasts the side grippers may thus be so positioned relatively to thetoe gripper as to cause the latter to engage and pull the upper symmetrically with reference to opposite sides of the toe of the last, as will he evident from a comparison of the dotted line positions of the different shoes of a pair in Fig. 2. r a

In the construction shown the springs 20 and 22 are not of equal strength, the springs 20 being stronger than the springs 22 enough to insure that each time when the parts of the machine come to rest after the operations upon a shoe have been completed theside grippers shall occupy the positions shown in the drawings at their limit of movement toward the left. This construction saves the operators time both by affording assurance of the normal location of the grippers and by making it unnecessary to effect any adjustment except for one of the shoes of the pair. in the construction shown the stronger springs are on the right hand side of the machine to position the parts normally for operation upon a left shoe, but it is, of course 'mmaterial on which side the stronger springs are located. The relative strength of the springs, moreover, is such that when the grippers are 'pushed over against the tension of the stronger springs they will remain in the position to which they are thus moved while the machine is at rest, the tension of the stronger springs being insufficient to overcome the friction of the parts particularly of lugs 36 in engagement with the bracket 6, in addition to overcoming the operator may use his hand directly to push When the grippers are the grippers over. thus positioned the upper will be engaged and pulled, and later fastened, at the toe and the sides in the correct relationto the last.

When the grippers finally release the stock and during their return to position for operating upon another shoe, the stronger springs will be ell'ective to insure the normal lateral position of the side grippers.

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

1. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of means constructed and arranged. to position said grippers with freedom for movement together in directions widthwisc of the last in response to lateral pressure against them while maintaining them substantially the same distance apart to position them for operating r .spectively upon right or left shoes.

2. In a machine of the class described,the combination with grippers for pulling an upper at opposite sides of a last, of means for maintaining the grippers in determined spaced relation, said means being mounted with freedom for movement in response to lateral pressure against the grippers to peri it said grippers to assume diiferentpost tions for operating respectively upon right or left shoes.

3; In a ma :hine oi" theclass describcd,the combination with "ipers forp'ulling an upper at opposite siees of a last. of means. for holdin g said grlppers in sep tion, and yielding means for. forcing the grippers toward each other in operative relation to said holding means, said holding means being mounted with freedonr for movement transversely of the machine to permit the grippers to assume different po sitions for operating respectively upon right or left shoes.

- 4a Ina machine of theclass described, the

combination with grippers for pulling an ited relaQ upper at opposite sides of a last, of a gripper positioning memb r for controlling relative movements of the grippers widthwise of the last, said member being arranged to space the grippers apart and mounted for movement to permit the grippers to be moved together laterally into positions for operating respectively upon right or left shoes.

5. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of a mem her for holding said grippers in determined spaced relation, and springs for maintaining the grippersin operative relation to said member, said member being mounted for movement in directions to permit the grippers to assume different positions for operating respectively upon right or left shoes.

6. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of a member for holding said grippers in determined spaced relation, and means for maintain ing the grippers in operative relation to said member, said member being pivoted'for movement transversely of the machine to permit said grippers to assume different lateral positions.

7. In a machine of the class described, the combination with grippers for pulling -an upper at opposite sides of a last, of a member for holding said grippers in separated relation, springs for forcing the grippers toward each other in operative relation to said member, said member being pivoted for lateral movement to permit the grippers to assume different positions for operating respectively upon right or left shoes, and means for limiting the lateral movement of said member.

8. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of a wedgeshaped member movable to vary the distance between said grippers, and means for main taining the grippers in operative relation to said member, the member being pivoted for additional movement transversely of the machine to permit the grippers to assume different lateral positions.

9. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of a member movable to vary the distance between said grippers, means for maintaining the grippers in operative relation to said mem her, and a gripper spreading slide along which the member is thus movable, the member having a tapering channel in which said slide is received to permit also a limited lateral movement of the member.

10. In a machine of the class described, the

combination with grippers for pulling an upper at opposite sides of a last, of a wedge shaped member for holding the grippers in separated relation, and springs for forcing the grippers toward each other in operative relation to said member, said member being adjustable in directions to vary the distance between the grippers and mounted also with freedom for limited movement laterally of the shoe to permit the grippers to assume different positions for operating respectively upon right or left shoes.

11. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of a wedge member for determining the distance between said grippers, said member being movable lengthwise to vary the distance between the grippers, the member being mounted also for lateral movement to permit the grippers to assume different positions for operating respectively upon right or left shoes.

12. In a machine of the class described, the combination with a toe gripper, of side grippers, and means for positioning the side grippers in spaced relation, said positioning means comprising a spacing member mounted substantially between said side grippers for movement in directions widthwise of a shoe positioned in the machine to permit lateral movements of the side grippers with relation to the toe gripper while maintaining the side grippers substantially the same distance apart.

13. In a machine of the class described, the combination with a toe gripper, of side grippers, said toe and side grippers being movable to pull an upper and also to draw the upper over the margin of the bottom of a last, and means for controlling the overdrawing movement of said grippers including a wedge member between the side grippers, said member being movable laterally to permit the side grippers to assume diiferent positions with relation to the toe gripper for operating upon right and left shoes.

14. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of means constructed and arranged to position said grippers with capacity for movement together transversely of the machine into positions for operating respectively upon right or left shoes, and means for normally maintaining said grippers in position to operate upon one shoe of a pair while permitting them to be moved together in response to pressure of the work or ofthe operators hand against them into position for operating upon the other shoe of the pair.

15. In a machine of the class described,

the combination with grippers for pulling an upper at opposite sides of a last, of a gripper positioning member mounted with freedom for movement transversely of the machine to permit the grippers to assume.

different positions for operating respectively upon right or left shoes, means for limiting the movements of said member in opposite directions to determine the correct positions of the grippers for right and left shoes, and

yielding means for normally maintaining the grippers at one of the limits of movement determined by said. positioning member.

16. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of a member for holding saidgrippers in separated relation, said member being mounted with freedom for limited movement transversely of the machine to permit the grippers to assume dilferent positions for operating respectively upon right or left shoes, and springs for maintaining the grippers in operative relation to said member, the spring for one side gripper being stronger than the spring for the opposite side gripper to cause the grippers to assume a normal position for operating upon one of the shoes of a pair.

17. In a pulling-over machine, the combination with side grippers, of a gripper spreading wedge positioned between them with capacity for limited lateral movement, and unbalanced overdraw springs holding the side grippers in operative relation to the wedge.

18. In a pulling-over machine, the combination with side grippers, of a gripper spreading wedge positioned between them with capacity for limited lateral movement, and unbalanced overdraw springs holding the side grippers in operative relation to the wedge and normally positioning the, grippers to receive one shoe of a pair, said springs being nearly enough balanced to permit the operator easily to push the grip-.

pers into position to receive the other shoe of the pair. e

19. In a machineof the class described, the combination with grippers for pulling an upper at opposite sides of a last, of means for positioning said grippers with capacity for lateral movement in directions widthwise of the last while maintaining them substantially the same distance apart, and spring means acting to maintain said grippers normally in one lateral position while permitting them to be readily moved to another lateral'position by pressure of the work or of the operators hand against them.

20. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of a last, of

means for positioning said grippers with" capacity for lateral movement in directions widthwise of the last, said positioning'means being constructed and arranged to cause both grippers to receive such lateral movement in response to pressure of the 'WOlk or of the operators hand'against one of them, and the machine being constructed to maintain the grippers prior to their operation upon a shoe 111 any position which they as sume in response to such lateral pressure.

21. In a machine of the class described, the combination with grippers for pulling an upper at opposite sides of'a last, of meansfor maintaining said grippers substantially a predetermined distance apart while permitting them to be moved together widthwise of the last into different positions for operating respectively upon right or left shoes, and limiting means for determining said difierent positions of the grippers.

22. In a machine of the class described, the combination with shoe positioning means, of side grippers mounted to swing laterally of the shoe, means for maintaining said grippers substantially a uniform distance apart while permitting them to be swung together into different positions for operating respectively upon right or left shoes, and a stop device arranged to limit such swinging movement of the grippers and to determine said different positions.

23. In a machine of the class described, the combination with grippers for engaging an upper at opposite sides of a last, of spacing means positioned substantially between the grippers and arranged to determine the distance between them, said spacing means being movable widthwise of the last to permit the grippers to assume difi'erent positions for operating respectively upon right or left shoes, and means for limiting the movement of said spacing means to determine the correct positions for the 'difierent shoes.

24. In a machine of theclass described,"

of the grippers the combination with grippers for engaging an upper at opposite sides of a last, of spacing means for determining the distance bethe combination with grippers for engaging tween said grippers, and spring means acting to press said grippers toward each other and to hold them in operative relation to thespacing means, said spacing means being movable in response to pressure against the grippers to permit the grippers to be dis-,

placed together. widthwise of the last to position them 7 for operating respectively upon right or left shoes.

26. In a machine of the class described,

the combination with shoe positioning means and opposite side grippers, of means for causing said grippers to assume automatically a laterally offset relation to the shoe positioning means suitable for op erating upon one of the shoes of a pair said means being responsive to pressure against the grippers to, permit adjustment of the grippers at the will of the operator into position for operating upon the other shoe 10 of the pair. 1

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

' IRVING A. COOK.

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