US3008157A

US3008157A - Cement lasting machine for use in the manufacture of shoes

Info

Publication number: US3008157A
Application number: US763074A
Authority: US
Inventors: Weinschenk Albert
Original assignee: EG Henkel Maschinenfabrik
Current assignee: EG Henkel Maschinenfabrik
Priority date: 1958-08-16
Filing date: 1958-09-24
Publication date: 1961-11-14
Anticipated expiration: 1978-11-14

Description

Nov. 14, 1961 A. WEINSCHENK 3,003,157

CEMENT LASTING MACHINE FOR uss IN THE] MANUFACTURE OF SHOES 4 Sheets-Sheet 1 Filed Sept. 24, 1958 Fla 1 iii Nov. 14, 1961 A. WEINSCHENK 3,008,157

CEMENT LASTING MACHINE FOR USE IN THE MANUFACTURE OF SHOES Filed Sept. 24, 1958 4 Sheets-Sheet Z VENTOQ: W W

ola 1 Nov. 14, 1961 A. WEINSCHENK 3, 0

CEMENT LASTING MACHINE FDR USE IN THE MANUFACTURE OF SHOES Filed Sept. 24, 1958 4 sheets-sheet Is FIG. 3

INVENTOB. aim m AGQAXQECIT/ Nov. 14, 1961 A. WEINSCHENK 3,008,157

CEMENT LASTING MACHINE FOR USE IN THE MANUFACTURE OF SHOES Filed Sept. 24, 1958 4 Sheets-Sheet 4 /Nl ENTO/2.' g I I g Uniterf. iitates My invention relates to cement lasting machines used in the manufacture of shoes for pulling over and lasting the vamp or upper. Such cement lasting machines are being used to avoid the use of tacks and to simplify the said pulling over and lasting operation. In such machines the upper is drawn over the last by means of pincers and thereafter lasted by means of wipers, the edge of the upper having been inwardly reversed by means of said wipers upon the inner sole placed on the last and cemented thereto. During the operation of such machines a piling up of leather, more or less depending on the type of shoe to be manufactured and on the kind of leather, occurs in theshank and consequently arising wrinkles have to be eliminated manually by cumbrously pulling the leather obliquely forward toward the toe. Very often this necessitates tearing apart already cemented sections and this results in a great and costly waste of time.

Attempts have been made to eliminate the said disadvantage by installing special ball pincers. Such pincers, however, released the leather at the beginning of the action of the wipers and thus did not prevent the slipping away of the upper in the direction of the shank and of the heel during the lasting action of the wipers. For thisreason it has been further suggested to use pivotable or retractable ball pincers, their pivoting motionbeing dependent on the wipers or on the upper pulled inward by these wipers; However even such ball pincers did not, at least not satisfactorily, prevent the slipping away of the upper in the direction of the heel and of the shank.

It is an object of my invention to eliminate the above mentioned disadvantages and to prevent the piling up of the leather in the shank and the slipping away of the leather in the direction of the shank. Moreover, my new machine permits applying immediately preceding the lasting of the upper an independent pull to the ball section in the direction of the toe, experience having shown that it is advantageous, in order to obtain a perfect lasting allowance free of wrinkles, to pull the edge of the upper in the ball section obliquely forward in the direction of the toe;

According to my invention the cement lasting machine has independently controllable ball pincers, which canbe pivoted not only in the direction toward the longitudinal axis of the last but also in the direction of the toe. These ballpincers ar'e put into operation after the actual pulling over operation and the subsequently following corrective adjustment of the upper are completed; they pullthe edge of the upper obliquely forward by their pivoting motions both inward and in the direction of the toe; before the wipers begin to operate, whereupon the lasting is enacted. In'this respect it is important that the release of the upper occurs only then, when a displacement of the leather in the direction of the shank and/ or of the heel by the ac tion of the wipers is no more possible. For this-purpose the ball pincers are controlled in dependence upon the path of the wipers, e'xpediently through the'wiper piston, arid the" control of the opening of the ball pincers isadj'ustable byregulating means in accordance with the existing conditions.

The said and other objects of my invention will be more fully understood from the following specification when read with the accompanying drawings in which one ate t ice 2 embodiment of my new cement lasting machine is illustrated,

In the drawing- FIG. 1 shows infront elevation the arrangement of ball pincers with the upper pulled over the last and held securely by the pincers;

FIG; 2 shows a side elevation of the ball pincers in starting position aswellas a side view of the valve mechanism for switching the pincers;

FIG. 3 shows a top view of the arrangement of the ball pincers after their pivoting movement in the direction of the center axis and of the toe of the shoe; the control mechanism of the device for disconnecting the pincers;

FIG. 4 shows sectional views of the pivoting support of the pincer carriers 12 with slide piston 16.

The same reference numbers indicate the same parts in all figures of the drawing.

The shoe last is designated by 1, the upper by 2, the inner sole by 3,- the last carrier by 4, the crimping wipers by 5, the side pincers by 6, and the toe pincers by 7'. A slidable support 8 provided with longitudinal grooves serves for the positioning and adjustment of the ball pincers 2627 in the direction of the length of the shoe in the required relation to the side pincers 6 and to the given length of size of the last. Two hexagonal clamp bolts 9 lock the slidable support 8 on the supporting trestle 10. This slidable support 8 is equipped with a bed bolt 11,- which serves as a seat for the pivoting support 12 of the pincers carrier. A retaining ring 1-3- assures the blocking of said support 12 invertical direction. This pivoting support 12 houses the pivoting bolt 14 for the piston housing 15;, and also the slide piston 16*, which,- when acted upon by pressure oil supplied through pipe 65, initiates the pivoting movement of the pincers in-the di{ rection of the toe; the hooked end portion of the slide 8 serving as a counterstop (FIG. 4-).

The pressure'spring 19 returns the pivoting support 12 of the pincers carrier together with the entire pincers mechanism after each operation into its initial position sectionA B in FIG. 4). The casing 17 tor the pressure spring 19 is fastened to the" slide 8 by means of bolts 18 (FIG. 1). The position of the bed bolt 11 is so selected that a favorable operation of the pivoting movement of the pincers with the upper leather is attained (see FIGS. 3 and 4).

Such pivoting movement-in the direction of the center axis of the shoe is effected by the piston 20 which is slidably mounted in the piston housing 15' and acted upon by pressure oil supplied through piping 64. The desired adjustment of the p-iv'otingmovementof piston housing 15 is'eifected by a stop screw 21 restoring spring 22 which returns the piston housing 15 into its initialposition aftereach' operation; anda' block spring 2.3which prevents an independent displacement of the stops'crew 21 which is screwed-for adjustment into the support 12;. A' regulating screw 24 mounted inthe piston housing-15 permits an adjustment of the initial position of the pincers relative to the" shoe last.

The-pincers support 25% serves as a seat for the ball pincers which are composed of the lower grasping jaw 26 and the upper graspin'g jaw 27'; =the'='lower jaw 26- is swingably mounted on a shaft bolt 28 whereas" the upper jaw 27' of. thepincers is permanently connected with the pincers support 25by means of positioning pins 31*. A? piston 29' reciprocable insup-port 25 is actuated by pres+ sure oil supplied by pipe 66* and closes atthe required

moment theball pincers

26, 27. A restoring spring 30 returns after each operation the pivotable lower pincer 26 into its low position, thus permitting the insertion of another piece of upper. Another restoring spring 32 returns the piston 29 into its initial position, after the pressure oil is shut olf. 'Ihe pincer support 25' can be easily adjusted on or detached from the connecting shaft 33 by means of a locking handle 36. The shaft 33 is also adjustably mounted in the piston housing 15, in order to permit its elevational adjustment relative to the 'lower edge of the crimping wipers 5. As shown a guide bolt 34 is bolted on shaft 33 and moves in a guide groove located in the piston housing 15 thus preventing a rotational movement of shaft33. After the pincers support 25 has been elevationally adjusted the same is blocked in the desired position by the pair of retaining rings 35 which are adjustably mounted for example screwed on the shown (FIG. 1) sleevelike extension of the piston housing 15 and between which the bolt 34 may be arrested.

A valve mechanism controlling the pincers serves for the release of the leather held by the ball pincers at the appropriate moment (FIG. 2). A valve 40 for the control of the pincers is attached by screws 41 on the machine frame 42. A control piston 43 in the valve 40 is kept in its initial position by pressure spring 44 in such a way that the pressure oil can flow through the pipe 66 to the ball pincers (see FIG. 1). A retaining ring 45 serves as the upper stop-guard, while the cover 46 of the valve 46) serves as a counterstop. When the control piston 43 is pressed down into its low position, the pressure oil supply in the pipe 66 leading to the ball pincers is disconnectcd and the oil flows into the return pipe 67; this causes the ball pincers to open and to release the leather for the lasting operation by means of wipers 5. On the piston 47 actuating the wipers is permanently mounted a control flange 48 by means of a positioning pin 49 (see FIG. 3). Furthermore, a guide rail 50 is fastened to said flange 48 by means of screws 51 and it moves in the groove 52 of the flange. The rail 50 serves at the same time as a seat for the carrier 53 of the cam roller 54. A pivot bolt 55 is fastened on the machine frame 42. On said bolt 55 is situated a cam lever 56 with the adjustable cam segment 57, the positioning pins 58 and the regulating screw 59. When the movement to close the wipers is started by the wiper piston 47, then the roller '4 presses the cam segment sooner or later, depending on the adjustment, and this segment presses in turn the control piston 43 into the low position and disconnects thus the pressure oil pipe 66, so that the ball pincers 26 are opened. Segment 60, connecting lever 61, wipers carrier 62, cam rollers 63 and wipers 5 participate in the movement to close the wipers.

The machine operates as follows: The upper 2 drawn over the last 1 is inserted in the usual manner into the pincers 6 and 7. Then the machine is actuated for example by a foot pedal. Thereafter the above mentioned hydraulic control is actuated, pressure oil from pipe 66 acts upon piston 29 and the pincers 6, 7 grasp the upper and close; thereafter the upper is pulled over the last and placed tightly thereon. The machine comes to a standstill and the upper leather can be correctively adjusted on the last.

A further pressing on the foot pedal initiates the second phase. The ball pincers 26, 27 are pivoted by the control piston 20, to which pressure oil is delivered through the pipe 64, in the direction of the center axis of the shoe and shortly thereafter the pressure oil pipe 65 receives also oil whereupon the

ball pincers

26, 27 are pivoted in the direction of the toe of the shoe by the control piston 16. Thereby the lasted portion of the upper is drawn in the direction of the toe and is held securely. The following closing movement of the wipers through the action of the wipers piston 47, segment 60, connecting lever 61, wipers carrier 62 which is controlled by the rolls 63, and wipers 5 bring about the lasting of the upper leather on the inner sole in the cementing process, which is done in the conventional manner. During this lasting operation, depending on the position of the segment 57 of the cam, which is aligned by means of the regulating screw 59, this segment 57 and the lever 56, respectively, press the control piston 43 into low position and the ball pincers are opened, so that a displacement of the upper in the shank is prevented. The toe pincers 7 and side pincers 6 have released their hold already at the beginning of the lasting operation, by means of another valve, not illustrated in the drawing, and operating independently from the above described steps.

It is essential for this invention that the ball pincers are controlled independently, as explained above. It is also important that the pivoting'movements precede immediately the closing movement of the wipers. Moreover, a special device for the opening of the pincers must be provided for, so that the upper is released only then, when the wipers 5 have taken hold of it, so that it cannot slip away in the shank. Another new and useful feature of this invention is the possibility to adjust the height of the pincers carrier, and by this also of the

pincers

26, 27, in relation to the lower edge of the wipers, enabling to regulate the stretch of the leather, depending on the kind of leather and the type of the shoe. It will be well understood that the machine can also be operated by a purely mechanical or electrical control.

What I claim as my invention is:

1. In a cement lasting machine for pulling over and lasting an upper in the manufacture of shoes, the improvement comprising in combination a pair of cooperating wipers; means to actuate said Wipers; independently controllable ball pincers pivotable about a horizontal shaft in a direction towards the longitudinal axis of the shoe as well as about a vertical shaft in the direction of the toe; said ball pincers being additionally elevationally adjustable relative to the lower edge of the wipers; means effecting such adjustment; and control means influenced by said actuating means for the wipers to control the opening movement of the ball pincers in dependence of the wiper action.

2. A cement lasting machine according to claim 1 comprising an elevationally adjustable shaft supporting each ball pincers and their actuating means.

3. A cement lasting machine according to claim 2 comprising a housing for said shaft; hydraulic means acting upon said shaft; said housing pivotably mounted on the horizontal shaft for the ball pincers; and set screws to adjust and control the pivoting movement of said housing.

4. A cement lasting machine according to claim 3 comprising a pivoting support for said housing and its shaft; said pivoting support pivotably mounted on the vertical shaft; and a hydraulically operated piston in said pivoting support effecting the pivoting movement of the ball pincers in the direction of the toe.

5. A cement lasting machine according to claim 4 comprising a restoring spring acting upon said pivoting support returning the same into its normal position. 6. A cement lasting machine according to claim 4 comprising a slidable support shiftable parallel to the longitudinal axis of the shoe and supporting said pivoting support and its shaft; said slidable support permitting an adjustment of the ball pincers mechanism in conformity with the size of the last and with the side pincers.

7. A cement lasting machine according to claim 1 comprising actuating means for the ball pincers independently and automatically operating preceding the lasting operation.

References Cited in the file of this patent UNITED STATES PATENTS