US2078577A

US2078577A - Shoe supporting mechanism

Info

Publication number: US2078577A
Application number: US89196A
Authority: US
Inventors: Robert H Lawson
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1936-03-30
Filing date: 1936-07-06
Publication date: 1937-04-27
Anticipated expiration: 1954-04-27

Description

April 27, 1937. R LAWSON 2,078,577

SHOE SUPPORTING MECHANISM Original Filed March 30, 1936 I I, G

Patented Apr. 27, 1937 SHOE SUPPORTING MECHANISM Robert H. Lawson, Beverly, Mass., assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey 7 Original application March 30, 1936, Serial No.

71,671. Divided and this application July 6, 1936, Serial No. 89,196

3 Claims. (01. 12-126) This invention relates to jacks for machines for operating upon shoes and is disclosed herein as embodied in an assembling machine. This application is a division of my application, Serial No. 71,671, filed March 30, 1936, to which reference should be made for description of all mechanism not specifically described herein.

The purpose of the assembling machine is to perform an initial lasting operation, preparatory to the pulling-over operation. In the assembling operation an upper is placed on a last to which an insole has already been tacked in the usual manner, and a counter, which is generally molded with an inturned flange, is placed between the lining and the upper, these parts of the shoe being loosely arranged on the last as well as possible after jacking the last. The last with the shoe on it is then presented to the assembling machine,

which stretches the upper forwardly and up- 0 wardly over the heel end of the inverted last, and

well as possible on the jack in an inoperative position, somewhat removed from the operating instrumentalities of the machine, and then to move the jack into operative position in the machine.

Conveniently, a jack for such purposes is pivoted at that end of the jack post which is remote from the last and shoe, so that the last and shoe are swung into-and out of the machine around such pivot. Such a swinging movement is not necessarily or conveniently more than about l0-15 in magnitude, the last being consequently tipped downward and toward the operator when the jack is swung out into inoperative or shoereceiving position. I have found that a greater angularity of the last at this time considerably facilitates the assembly of the shoe on the jack. Accordingly, and in accordance with the present invention, Ihave provided a jack as above described with a last-receiving and holding member shown as an ordinary jack pin which is pivoted to the main body of the jack in such manner as to tilt a last thereon to a substantially greater degree than is eifected by the main tilting movement of the jack in moving out of its operative position, and I have provided mechanism for moving the last into proper relation to the main body of the jack simultaneously with the movement of the jack as a whole into operative position in the machine.

It is advisable that the reorientation of the last in proper operative relation to the jack should be accomplished before the last reaches the immediate vicinity of the operating parts of the machine in order that a rotating movement of the last on the main body of the jack while in such vicinity may not require prejudicial modification of construction in the machine itself in order to avoid interference with the shoe-treating mechanism thereof. I have therefore, in accordance with another feature of the invention, provided mechanism for effecting such reorientation during the early part of the movement of the jack into the machine. Conveniently, and as shown in the illustrated machine, the last-carrying member is tipped upon the main body of the jack by a pair of toggle links which are operated by a link extending into the machine and having frictional sliding engagement therewith, the frictional force exerted being suflioient to operate the toggle links to tilt the last into proper position by virtue of the movement of the main body of the jack into the machine, the structure being such that the last is in proper position on the jack before the jack arrives in operative position, the frictional sliding of the link into the machine absorbing the remaining movement of the jack.

These and other features of the invention comprising certain combinations and arrangements of parts will be apparent from the following description of a preferred embodiment of the invention shown in the drawing, in which Fig. 1 is a side elevation of the machine;

Fig. 2 is a detail of the jack;

Fig. 3 is another detail of the jack in operative position; and

Fig. 4 is a detail of the jack-operating mechanism.

All reference numerals used herein are identical with those of my parent application above referred to.

The machine frame is denoted by the numeral IE1.

For supporting the shoe there is provided a support or jack best shown in Fig. 1. The heel end of the shoe is supported by a member l2, the upper surface of which is formed to engage the top of the cone of the last, and is provided with a jack pin It. The member I2 is pivoted at It on a pin extending heightwise of the last and shoe thereon, and located forwardly of the jack pin, so that the heel end of the shoe may be centralized between two geared equi-acting centralizing fingers l8 (Fig. 8) when in operative position, as will be described below. The pin it is mounted on a block 20 pivoted at 22 on the upvided with a pair of equalizing leaf springs 26 to effect approximate centralization of the member I 2 when it is swung out of operative position toward the operator as in Fig. 1. This is effected by upstanding ears 28 on the springs 26, engaging opposite sides of the member I2.

The axis at 22 is horizontal and crosswise of the shoe. by two

toggle links

32, 34 to the block 20. The central point of the toggle links is carried in a slot 36 in the end of a bar 38 which is supported in a friction device 48 in the frame I8. When the jack is tipped clockwise from the position shown in Fig. 1 to operative position, the toggle joint first runs to the right end of the slot 38 and then the friction device 48 causes the toggle links to straighten and tips the block 28 about the axis 22 to bring the shoe bottom into an approximately horizontal position. The friction device then slips until the jack post 24 has been brought to an approximately vertical position.

This position of the jack is maintained by a set of diiferential pawls 42 which engage teeth in a plate 44 mounted at the top of a casing 46 which carries the jack post 24. The pawls 42 are pivoted in an arm 48 pivoted at 59 on the frame I8 and are spring-pressed counterclockwise (Fig. 1) around their pivot, their movement in this direction being limited by stops 52 so that the pawls can be released from the plate 44 by pulling up on the rod 54 as will be described below.

The jack post 24 is slidably mounted in the casing 48 which is pivoted at 56 to the machine frame In. The post rests upon an adjusting screw 58 in the casing 46, by means of which its height can be regulated. The screw 58 is threaded into a carrier 68 which slides vertically in the casing 46. The carrier 88 is pivoted at its lower end at 62 to a block 64 rigidly mounted on the upper end of a rod 66 slidably mounted in a vertically movable block 68 having a spring I0 mounted in a bore therein and pressing upwardly against the block 64. The compression of the spring in is regulated by an abutment screw 12. The block 68 overhangs the block 64 at 14, and tends to pull it downward at times, but the block 68 can rise relatively to the block 64, the spring 18 being then compressed. Also, a spring I6 is provided, between the portion 14 and a shoulder on the casing 46, which tends to force the block 68 downwardly. The block 68 is located in a cutout portion at the rear of the casing 46, but does not contact with the casing; it is in effect carried slidably by the rod 66, which hangs on the bottom of the member 80, which does have a sliding fit in the casing 46.

The block 68 is pivoted at its lower end at 18 to the end of an operating lever 88, pivoted at 82 on the frame III. The rocking of the lever 88, by the downward movement of the rod 84, raises the block 68 and through the spring 10 effects a resilient upward movement of the elements 64, B0 and the jack post 24. This forces a shoe on the jack up against a holddown 86 (Fig. 6).

Provision is also made for a positive non-resilient movement of the jack post, following the resilient movement just mentioned. To this end a collar 88 is slidably mounted on the bar 66. The collar 88 has (Fig. 2) two spaced ears 90 on its front side between which is pivotally mounted a clutch dog 92 on a pin 94, which is supported in the ears 90. The dog 92 is arranged to jam on a flat place 96 on the bar 66 when turned The post 24 has an arm 38 connected per end of a jack post 24. The block 20 is proclockwise as seen in Fig. 2. The outer end of the dog 92 is pivotally connected to the lower end of the block 83 by a link 98. The ends of the pin 94 are embraced by notches in the ends of parallel forked horizontal arms I80 of a bellcrank lever I02 pivoted at I84 on the casing 46, the vertical arm of the bell-crank lever being resiliently forced clockwise (Fig. 1) by the spring I86, such movement being limited by a stop screw I88. This stop screw I08 is set so that a definite upward movement of the link 98 is necessary to turn the clutch dog 92 into gripping relation with the surface 86, and until this happens the upward movement of the jack post is resilient: afterward, the block 68, bar 86, slide 64 and jack post 24 all move positively, together, the spring I86 yielding during the positive movement, as the pin 94 rises with the bar 66.

The jack is pulled back into operative position by a bell-crank lever IIO operated by a rod 2 and connected to the jack by a resilient link II4, This link comprises a member I I6 mounted on the casing 46 and a member H8 pivotally connected to the upstanding arm of the bell-crank I I8, and

having a reduced front end H9 slidably extending through a guide hole in the member H6, the members H6 and H8 being connected by a spring I28. This movement of the jack carries the shoe under the holddown member 86, which acts to wipe down the upper and counter at the rear end of the shoe.

For a description of the shoe-treating mechanism reference is made to my application above mentioned, of which this application is a division.

This mechanism, as well as the shoe-positioning I mechanism described herein, is operated from a cam shaft 2 I8, the cams carried by which operate various levers mounted on

shafts

228, 238, and 252. Only a part of the cam mechanism need be described herein, such part being shown in Fig. 4. The cams concerned in the operation of the shoe-positioning mechanism are cut on a disk 298 fixedly mounted on the cam shaft 2I8. The disk 298 has a peripheral cam 300 and also has cam tracks 302, 304 on its opposite sides. The

peripheral cam 30!] cooperates with a roll 306 on an arm 3B8 pivoted on the shaft 252 (see Fig. 4) which arm pivotally carries the end of the rod 84 which is connected to the rear end of the jacklifting lever 88 (Fig. 1). cooperates with a roll 3|!) on a lever 3I2 mounted on the shaft 238 and carrying the upper end of the rod 54 which, when pulled upward, unlocks the jack and permits it to fall forward into the Fig. 1 position. The cam track 304 cooperates with a roll 3| 4 on one arm of a bell-crank 3I6 pivoted at 252, whose other arm 3I8 carries the upper end of the rod I I2 which operates the jack drawing-in bell-crank lever I ll].

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

1. In a shoe making machine, a jack movable between an operative position in the machine and an inoperative position remote from the operating instrumentalities of the machine, said jack comprising a jack post and a last-carrying head pivoted to said post on an axis extending laterally of a last on said head, whereby a last on the jack may tip downward toward the operator when in the said inoperative position for convenience in placing a shoe thereon, mechanism connecting the last-carrying head, at a point remote from its said pivotal axis, to the jack post, and arranged The cam track 302 =,.=i

to rotate the head about its pivot to move a last thereon between a position with its bottom substantially perpendicular to the jack axis and the said position in which it is substantially tilted on the jack, and a link connecting the said mechanism to the machine frame and arranged to operate the said mechanism when the main body of the jack moves into or out of the machine, the connection at one end of the link being frictional, whereby when the jack post is moved toward the machine to place a shoe on the jack in operative relation to the machine, the bottom of the shoe is brought into the said perpendicular position during the early part of said jack movement, the link slipping through its frictional connection during the remainder of said jack movement.

2. In a shoe making machine, a jack having an inoperative position remote from the operating instrumentalities of the machine, said jack comprising a jack post and a last-carrying head pivoted to said post on an axis extending laterally of a last on said head, whereby the last may tip downward toward the operatorfor convenience in placing a shoe thereon, a pair, of toggle links connecting the last-carrying head, at a point re mote from its said pivotal axis, to the jack post, and arranged, when straightened, to rotate the head about its pivot to bring a last thereon into a position with its bottom substantially horizontal, and a link connecting the pivot of the toggle links to the machine frame, and arranged to straighten the toggle when under compressive stress, the connection at one end of the link being frictional, whereby when the jack post is moved toward the machine to place a shoe on the jack in operative relation to the machine, the bottom of the shoe is brought into a horizontal position during the early part of said jack movement, the link slipping through its frictional connection during the remainder of said jack movement.

3. In a shoe making machine, a jack pivotally mounted to swing into and out of the machine, the jack comprising a jack post and a last-carrying member pivoted thereto on an axis parallel to the axis of the said pivotal mounting, a toggle mechanism connecting the last-carrying member to the jack post, and being in bent condition when the jack is swung out of the machine, thereby permitting the last-carrying member to tilt away from the machine to facilitate the placing of a shoe thereon, and a connection between the toggle mechanism and the machine frame, arranged to straighten the toggle as the jack is swung into the machine about its pivot, whereby the last-carrying member will be swung about its pivot to bring the bottom of a last thereon into horizontal position, said connection comprising a sliding friction device, arranged to provide a resisting force adequate to straighten the toggle mechanism but not to prevent movement of the jack into the machine after the toggle is straightened.

ROBERT H. LAWSON.