US2305682A - Gripper - Google Patents

Gripper Download PDF

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Publication number
US2305682A
US2305682A US40458941A US2305682A US 2305682 A US2305682 A US 2305682A US 40458941 A US40458941 A US 40458941A US 2305682 A US2305682 A US 2305682A
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Prior art keywords
upper
jaws
jaw
gripper
pulling
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Expired - Lifetime
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Fred C Eastman
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Emhart Enterprises Corp
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Emhart Enterprises Corp
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    • AHUMAN NECESSITIES
    • A43FOOTWEAR
    • A43DMACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D23/00Single parts for pulling-over or lasting machines
    • A43D23/02Wipers; Sole-pressers; Last-supports; Pincers
    • A43D23/027Pincers

Description

Patented Dec. 22, 1942 UNITED STATES PATENT--`OFFICE GRIPPER Fred C". Eastman, Marblehead, Mass., assigner to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application July 30, 1941, Serial No. 404,589 22 claims.v (ol. 12J-101.1)

This invention relates to grippers foruse in shoemachines for pulling uppers to shape them over lasts or other forms. The invention is herein illustrated as embodied in a gripper particularly designed for use in a toe-lasting ma.

upper maintain a grip of the same force thereon during the upper-pulling operation, the jaws being closed by spring-operated mechanism the action of which is unaffected by the pulling'of the upper. While this construction has proved satisfactory under most conditions, it has been found that when an upper is unusually heavy and is subjected to a comparatively hard pull the jaws may not hold it securely enough for the best results in the upper-pulling operation. An object of the present invention, accordingly, is

to provide a construction such as to increase theV security with which the upper is gripped and held by the jaws without the necessity of using Ya jaw-closing spring which is stronger than is otherwise desirable. To this and other ends,

the invention sherein illustrated as embodied*` in a gripper having mechanism for eiecting relative movement of the jaws to grip the upper prior to the upper-pulling operation and additional mechanism for eiecting further relative movement of the jaws to increase the force of their grip on the upper in the course of the upper-pulling operation. In the construction shown this additional mechanism acts in response to resistance of the upper to the force of the pull applied thereto, so that the force with` which the upper is gripped increases with the force of the pull. As more particularly herein illustrated, the gripping of the upper prior to the pull is effected by a cam which is operated by the usual jaw-closing spring and acts on one of ther jaws alone to move it into upper-gripping position and to lock it against reverse movement, and the increase in the force of the grip of the jaws on the upper is eiected through' lever mechanism which acts on the other jaw aloneand is operated by relative movement of parts of the gripper resulting from resistance of the upper to the force of the pull. In addition to novel features involved in such a combination of mechanisms for effecting'the gripping of the 55 upper and for increasing the force of the grip thereon, novel features are also to be recognized inthe jaw-closingmeans and in the means for increasing the force with which the jaws grip the upper. 4

When a shoe isA positioned bottom upward for vthe ltoe-lasting operation in the machine distate the insertion of theI proper amount of upper materialsl in 'the'jaws of the gripper, the jaws are arrangedto 'extend lengthwise of the last at an inclination to the bottom of the last such that portions 'of the jaws located comparatively near the end of the toe extend farther toward the upper heightwise of the last than portions more remote from the end of the toe. In the construction shown, moreover, the jaws are provided with upper-engaging teeth arranged to extend lengthwise of the margin of the upper and have notches formed only in portions of the teeth which are located comparatively near the end of the toe. Theportions of the teeth where the notches are located grip the upper more effectively than vother portions, so that the upper is held more securely in locations where it is' comparatively loose on the last than it is near the portions thereof which have already been pulled over or lasted. Since the upper near these portions need be pulled but little in the toe-lasting operation,

the jaws may slip more or less thereon while maintaining a more secure grip on the portions nearer the end of the toe where a more effective pull is required.

The above and other features of the invention, including various novel details of construction vand combinations of parts, will now be more par- Fig. 2 shows a portion of the same `'gripper in elevation, as viewed from the left withlreference to Fig. 1;

Fig. 3 is a view similar to Fig. 1 of a portion of the gripper, but showing the parts as they appear when gripping and pulling an upper and showing also other portions of the machine;

Fig. 4 is a view similar to Fig. 2 of the gripper jaws, but illustrating their relation to a shoe in the pulling of the upper and showing also a portion of another one of the grippers;

Fig. 5 shows one of the jaws detached; and

Fig. 6 is a plan view illustrating how the several grippers are grouped relatively to the shoe and to toe-lasting wipers in the above-mentioned machine.

The machine shown in the above-mentioned Letters Patent is provided with three grippers for gripping the margin of the toe-end portion of the upper and for pulling the upper automatically in time relation to the operation of wipers 2 which, after the pulling of the upper, wipe its marginal portion inwardly over the insole into lasted position, as shown in Fig. 6, the last and shoe being held by a toe rest 4 (Fig. 4) in :a position determined by an insole-engaging plate 6 (Figs. 3 and 6). The grippers comprise a toeend gripper 8 for pulling the upper at the end of the toe and opposite side grippers I0 arranged to act on the upper at the `sides of the toe. The

present drawing shows, by reference to details of the left-hand side gripper, how each of the two side grippers may be modified for purposes of this invention, and it is contemplated that the toe-end gripper 8 will in most respects be simi-F larly modified in a manner which Will be Obvious from the description of the side gripper construction.

The side gripper I8 shown in Figs. 1, 2 and 3 includes a pair of upper-gripping jaws I2 and vI4 supported by a tubular casingxIS which corresponds to the casing 408 shown in the previously mentioned Letters Patent. The jaws, however, are not supported directly on the casing, as

heretofore, but on a jaw carrier I8 having a tubu-` lar portion extending upwardly into an enlarged lower end portion of the casing and loosely mounted therein to permit relative vertical movements of the jaw carrier and the casing between limits determined by a pin 22 mounted in the casing and a slot 24 formed in the tubular portion 2D of the jaw carrier. The purpose of this lconstruction will be hereinafter described. Clamped on the casing I6 are members 26 and 28 through which upward movement is imparted to the grip` per to pull the upper heightwise of the last, these members corresponding to the members 524 and 526 shown in the above-mentioned Letters Pat ent. Within the casing is a jaw-closing rod similar to a corresponding rod of the prior construction and arranged .to be moved upwardly by a spring 32 to effect relative movement of the jaws to grip the upper, this spring acting on. the lower end of a tubular plunger 34 which is slidingly mounted on the upper end of the rod and carries a pin 3S extending through a slot 38 in the rod. It will be understood that in moving the rod upwardly the pin engages it at the upper end of the slot. In the construction herein shown the lower end of the spring 32 lis seated on the jaw carrier I8. When the jaws are in open relation the rod 3!) is held depressed as heretofore by a member in engagement-with the upper end of the plunger 34, the plunger acting yieldingly on the rod through the pin 36 and a light 75 spring 42 in the rod. The member 40 corresponds to the member 452 shown in the abovementioned Letters Patent.

In the construction herein shown both the jaws I2 and I4 are mounted to swing about a pin 44 supported by the lower ends of two downwardly extending plates 46 which are formed on the jaw carrier I8 in spaced relation to each other. The gripping of the upper in response to the upward movement of the rod 30 is effected by swinging movement of the jaw I2, which engages the outer face of the upper, toward the jaw I4. For this purpose, in the construction herein shown, an upwardly extending tail portion 48 of the jaw I2 is engaged by a cam 50 rotatably mounted on a pin 52 supported by the plates 45 of the jaw carrier I8 and parallel to the pin 44. This cam is provided with a recess 54 to receive the tail portion of the jaw when the latter is in its open position, as illustrated in Fig. 1, and with a peripheral face 56 for engaging the tail portion of the jaw to impart to the jaw the latter portion of its swinging movement. This peripheral face of the cam is in such relation to the axis of the pin 52 that when the jaw I2 is in uppergripping position, as shown in Fig. 3, the cam serves to lock it effectively against any reverse swinging movement. For rotating the cam thus to operate the jaw I2 the rod 30 is connected to the cam by a pair of links 58 between which the tail portion 48 of the jaw lies when the jaws are in open relation. For returning the jaw I2 to open position there is provided a link 60 pivotally connected to the cam 58 and having therein a slot B2 in which lies a pin 64 carried by the tail portion 48 of the jaw. By reference to Figs. 1

-and 3 it will be evident that this slot permits the link to move idly during a portion of the return movement of the .cam 50 and that the cam acts thereafter through the link to swing the jaw I2 to its fully open position.

When the jaw I2 is swung as above described to grip the upper, no corresponding movement of the jaw i4 toward the jaw I2 takes place, and, accordingly, the gripping of the upper is effected by the movement of the jaw I2 alone. The jaw I4, however, is not xed to the jaw carrier I8, but as previously suggested is capable of swinging about the pin 44. For controlling the jaw I4 there are provided two levers 66 mounted at the outer sides of the plates 46 of the jaw carrier I8 to swing about the previously mentioned pin 52, the right-hand ends of these levers, as the parts are viewed in Figs. 1 and 3, being connected by links 63 to the jaw I4. Only one of these links is visible in the drawing, since they lie in the same vertical planes as the plates 45 oi the jaw carrier. The other ends of the levers 66 are connected by links 'I0 to the previously mentioned pin 22 which is mounted in the casing I6. It will thus be seen that no swinging movement of the jaw I 4 about the pin 44 can take place except as accompanied by relative vertical movement of the casing i3 and the jaw carrier I8. In the pulling of the upper heightwise of the last, as more fully hereinafter explained, there is a tendency to move the casing upward relatively to the jaw carrier and thereby to move the jaw I4 toward the jaw I2 to increase the force with which the upper is gripped by the jaws. It will be understood that the two levers 66 have a single function, the duplicate construction being provided simply for greater strength .and better balance.

By reference to Fig. 4 it will be observed that the jaws of the gripper are inclined somewhat relatively to the bottom of the last in a downward direction toward the end of the toe. The reason for this construction is that when a shoe is presented to the machine the margin of the upper which is to be engaged by the gripper at each side of the toe usually occupies a position somewhat lower near the end of the toe than farther heelwardly, as hereinbefore explained. The inclination ofthe jaws in the manner illustrated facilitates the insertion of the proper amount of upper in the jaws throughout the length of the jaws. It will also be observed by reference particularly to Figs. 1 and 5 that the jaw I4 is provided with two teeth 12 arranged to extend lengthwise of the margin of the upper and that the jaw I2 has a single similarly extending tooth 14 arranged to force the upper into the uspace between the two teeth 12. In portions of the several teeth which are located com-L paratively near the end of the toe there are provided notches 16 which increase the eiectiveness of the grip of those portions of the teeth on the upper as compared with the portions which are Without such notches. Accordingly, the gripper holds the upper more securely in locations where it is comparatively loose on the last prior to the toe-lasting operation than adjacent to portions of the upper which have already been pulled over or lasted and where, therefore, but little further pull is required.

The manner of operation of the novel gripper will now be briefly summarized. Initially the member 40 is in the position illustrated in Fig. l

and holds the jaw-closing rod 30 depressed with" the jaws of the gripper in open relation, the jaw carrier I8 being held by this member, through the spring 32, in its lowest position determined by engagement of the pin 22 with the tubular portion 20 of the carrier at the upper end of the slot 24. It will be understood that at this time the gripper jaws occupy a lower position than in Fig. 4, their downward inclination toward the end of the toe being such as to facilitate the`A insertion of the proper amount of upper ma-i terials between them near the end of the toe as well as in other locations. When in the operation of the machine the member 40 is moved upwardly and the jaw-closing rod 30 is accord-` A ingly lifted by the spring 32, the rod acts through the links 58 to swing the cam 50 from its starting position (Fig. l) to the position in which it is shown in Fig. 3, the cam acting on the tail portion 48 of the jaw I2 to swing this jaw toward the jaw I4 into position to grip the upper.

Near the end of its movement the jaw I2 by its pressure on the margin of the upper causes the jaw I4 to swing a short distance in the same direction as the jaw I2. The effect of this movement of the jaw I4 is to swing the levers 66 about their connections with the links 18 and thus to lift the jaw carrier I8 relatively to the casing I6 to space the upper end of the slot 24 from the pin 22. This action is facilitated by reason of the fact that after the upward movement of the member 40 away from the plunger 34 there is no longer any tendency to force the jaw carrier I8 in a downward direction relatively to the casing I6 through the spring 32.

Thereafter, in the course of the operation of the to the jaw carrier I8 through the links 10 and the levers 6B connected by the links 68 to the jaw I4, and in so far as this force is effective to lift the jaw carrier it is also effective on the jaw I4 to increase the force with which the upper is gripped by the jaws, the jaw I2 being held positively by the cam 50 against reverse movement. In other words, the mechanism connecting the casing I6 to the jaw I4 acts in response to resistance of the upper to the force of the pull applied thereto, by reason of the tendency of the casing to move upward relatively to the jaw carrier I8, to increase the force with which the upper is gripped by the jaws. Accordingly, insurance is afforded that if an upper is unusually heavy and is subjected to a comparatively hard pull the jaws will hold it securely enough for satisfactory results in the lasting operation. By reason of the construction of the jaws,'however, they may slip more or less near the end of the upper-pulling operation on portions of the upper comparatively remote from the end of the toe while maintaining a more effective grip on portions located nearer the end of the toe, as hereinbefore explained.

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

1. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, said gripper including jawclosing mechanism for eiecting relative movement of said jaws to grip the upper prior to the upper-pulling operation and including also additional mechanism for thereafter effecting further relative movement of the jaws in the course of the upper-pulling operation to increase the force of their grip on the upper.

2. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, said gripper including jawclosing mechanism for effecting relative movement of said jaws to grip the upper prior to the upper-pulling operation and including also additional mechanism arranged to act thereafter in response to resistance of the upper to the force of the pull applied thereto to effect further relative movement of the jaws to increase the force of their grip on the upper.

3. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, said gripper including a jaw carrier supporting said jaws, means supported on said jaw carrier for eiecting relative movement of the jaws to grip the upper prior to the upper-pulling operation, and additional means also supported on said jaw carrier for thereafter effecting further relative movement of the jaws in the course' of the upper-pulling operation to increase the force of their grip on the upper.

4. In a shoe machine, a gripper'having a pair of jaws for gripping an upper between them and ojf jaws for gripping an upper between them and for pulling the upper, means for moving one of Said jaws alone toward the other jaw to grip the upper prior to the upper-pulling operation, and additional means for thereafter moving said other jaw alone toward the iirst-n'amed jaw in the course of the upper-pulling operation to increase the force with which the upper is gripped by the jaws.

G. In a shoe machine, a gripper having a pair.

of jaws for gripping an upper between them and for pulling the upper, means for moving one of said jaws alone toward the other jaw to grip the upper prior to the upper-pulling operation, and mechanism arranged to act thereafter in response to resistance of the upper to the force of the pull applied thereto to move said other jaw toward the rst-named jaw and thus to increase the force with which the upper is gripped by the jaws.

7. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, mechanism for moving one of said jaws alone toward the other jaw to grip Vthe upper and for locking it positively against reverse movement, and additional mechanism arranged to act thereafter in response to resistance of the upper to the force of the pull applied thereto to move said other jaw toward the firstnamed jaw and thus to increase the force with which the upper is gripped by the jaws.

8. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, a cam arranged to act on one of said jaws alone to move it toward the other jaw to grip the upper and then to hold it against reverse movement, and mechanism arranged to act thereafter in the course of the upper-pulling operation to move the other jaw toward said cam-operated jaw and thus to increase the force with which the upper is gripped by the jaws.

9. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, a jaw carrier supporting said jaws, means supported on said jaw carrier for moving one of the jaws alone toward the other jaw to grip the upper prior to the upperpulling operation, and additional means also supported on said jaw carrier for thereafter moving said other jaw toward the rst-named jaw in response to resistance of the upper to the force of the pull applied thereto to increase the force with which the upper is gripped by the jaws.

10. In a shoe machine, a gripper having a Ipair of jaws for gripping an upper between them and for pulling the upper, said gripper including a jaw carrier supporting said jaws, a Cam rotatably supported on said jaw carrier and arranged to act on one of said jaws to move it toward the other jaw to grip the upper, spring-operated means for thus operating said cam prior to the upper-pulling operation, and mechanism also supported on said jaw carrier for thereafter moving said other jaw toward the cam-operated jaw in the course of the upper-pulling operation to increase the force with which the upper is gripped by the jaws.

11. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, said gripper including parts relatively movable in response to resistance of the upper to the force of the pull applied thereto, mechanism for moving one of said jaws alone toward the other jaw to grip .the upper prior to the upper-pulling operation, and additional mechanism arranged to be operated by the relative movement of said parts in the course of the upper-pulling operation to move said other jaw toward the first-named jaw to increase the force with which the upper is gripped kby the jaws.

12. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, said gripper including a jaw carrier supporting said jaws and also a member supporting said jaw carrier, said carrier and member being relatively movable in response to resistance of the upper to the force of the pull applied thereto, means supported on said jaw carrier for effecting relative movement of the jaws to grip the upper prior to the upper-pulling operation, and additional means also supported on the jaw carrier and connected to said member for thereafter moving one of the jaws toward the other to increase the force of their grip on the upper in response to the relative movement of said carrier and member in the upper-pulling operation.

13. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, said gripper including a jaw carrier supporting said jaws and also a member supporting said jaw carrier, said carrier and member being relatively movable in response to resistance of the upper to the force of the -pull applied thereto, a cam supported on said jaw carrier for moving one of the jaws toward the other to grip the upper prior to the upper-pulling operation, a lever also supported on said jaw carrier and connected to said other jaw, and means connecting said lever and member for operating the lever to move said other jaw tow-ard the first-named jaw to increase the force with which the upper is gripped by the jaws in response to the relative movement of said carrier and member in the upper-pulling operation.

14. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, said gripper including members relatively movable in response to resistance of the `upper to the force of the pull applied thereto and on one of which members the jaws are supported, a lever supported on said last-named member for moving one of the jaws toward the other to increase the force with which the upper is gripped by the jaws, and means for thus operating said lever by the relative movement of said members in the upper-pulling operation.

15. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, said gripper including members relatively movable in response to resistance of the upper to the force of the pull applied thereto and on one of which members the jaws are supported, a lever fulcrumed between its opposite ends on said last-named member, a link connecting one end of-said lever to one of the jaws for moving that jaw toward the other [by the lever to increase the force with which the upper is gripped by the jaws, and a link connecting the other end of the lever to the other member for thus operating the lever lby the relative movement of said members in the upperpulling operation.

16. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, a member on which said jaws are supported, a cam rotatably supported on said member for moving one of the jaws toward the other to grip the upper by engagement of the -cam with the jaw thus moved, and a spring-operated member for rotating said cam.

17. In a shoe machine, .a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, a member on which said jaws are supported, a cam rotatably supported on said member for moving one of the jaws toward the other to grip the upper, a spring-operated rod, and a link connecting said rod Ito the cam for rotating the cam by the rod.

18. In `a shoe machine, a gripper having a pair of jaws forgripping an upper between them and for pulling the upper, a member on which said jaws are supported, a cam rotatably supported on said member for swinging one of the jaws toward the other to grip the upper by rotation of the cam about an aXis substantially parallel to the axis of the swinging jaw, and spring-operated means for thus rotating said cam.

19. In a shoe machine, a gripper having a pair of jaws for gripping an upper between them and for pulling the upper, a jaw carrier supporting `said jaws and movable with them to pull the upper, a cam supported on said jaw carrier for rotation to move one of the jaws toward the other to grip the upper, and a spring arranged thus to rotate said cam and movable thereafter bodily with the jaws in the pulling of the upper.

20. In a shoe machine, the combination with means for positioning a last and shoe for the lasting of the toe-end portion of the upper, of

grippers for gripping and pulling the upper a-t the opposite sides of the toe respectively, each of said grippers having a pair of upper-gripping jaws arranged to extend lengthwise of the last at such an inclination to the bottom of the last as to cause portions of the jaws which engage the upper comparatively near the end of the toe to extend farther toward the upper heightwise of the last than portions of the jaws more remote from the end of the toe.

21. In a shoe machine, the combination with means for positioning a last and shoe for the lasting of the toe-end portion of the upper, of grippers arranged to pull 4the upper at the cpposite sides of the toe respectively and each having a pair of jaws for gripping the upper between them, portions of said jaws which are located comparatively near the end of the toe being so formed as to grip the upper more securely than portions more remote from the end of the toe.

22. In a shoe machine, the combination with means for positioning a last and shoe for the lasting of the toe-end portion of the upper, of grippers arranged to pull the upper at the `opposite sides of the toe respectively and each having a pair of jaws for gripping the upper between them, said jaws being provided with upper-engaging teeth extending lengthwise of the margin of the upper and the teeth having notches formed only in portions thereof which are located comparatively near the end of the toe.

FRED C. EASTMAN.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693606A (en) * 1952-03-14 1954-11-09 United Shoe Machinery Corp Lasting machine
DE1135339B (en) * 1959-03-31 1962-08-23 Schoen & Cie G M B H Aufzwickmaschine for overtaking and adhesive twinge of shoe uppers over strips
US3793661A (en) * 1971-07-19 1974-02-26 Schoen & Cie Gmbh Gripper device for a heel-lasting machine
US20040112589A1 (en) * 2000-10-02 2004-06-17 Cook Robert Lance Mono-diameter wellbore casing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693606A (en) * 1952-03-14 1954-11-09 United Shoe Machinery Corp Lasting machine
DE1135339B (en) * 1959-03-31 1962-08-23 Schoen & Cie G M B H Aufzwickmaschine for overtaking and adhesive twinge of shoe uppers over strips
US3793661A (en) * 1971-07-19 1974-02-26 Schoen & Cie Gmbh Gripper device for a heel-lasting machine
US20040112589A1 (en) * 2000-10-02 2004-06-17 Cook Robert Lance Mono-diameter wellbore casing

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