US2324129A - Presser structure for shoe lasting machines - Google Patents

Description

July 13, 1943. J. w. BARNA 2,324,129

PRESSER STRUCTURE FOR SHOE LASTING MACHINES Filed April 2, 1942 2 Sheets-Sheet 1 J05 e m? fV $41774 y 1943. J. w; BARNA 2,324,129

PREfiSEWSTRUCTURE FOR SHOE LASTING MACHINES Filed April,2, 1942 2' Sheets-Sheet 2 "Patented July 13, 1 943 UNITED STATE PATENT OFFICE PRESSER STRUCTURE FOR SHOE LASTING MACHINES (Jhicago, Ill.

Application April 2, 1942, Serial No. 437,332

4 Claims.

My invention relates to presser structure for lasting and sole laying machines for pressure application to soles for cementing thereof to the welt or welted margin of shoe uppers held to lasts by wiper assemblies.

My invention may be considered as an improvement over the presser structure arrangement such as is disclosed in my Patent No. 2,144,582, dated January 17, 1939, in which arrangement the presser foot is supported at the lower end of a threaded shaft which must be turned to bring the presser foo+u into pressure engagement with the sole to be laid. With such adjustment, the pressure of the foot is not always certain unless the shaft, for each pressure engagement, is given the same number of turns, and any overturning or underturning will, of course, result in too great or too little pressure.

important object of my invention is to prv.'.de presser structure in which accurate adjustment may be made for predetermined pressure movement of the presser foot together with actuating means, each operation of which will result in such predetermined movement, so that in the laying of soles on a particular run of shoes the same predetermined pressure will in each case be applied to the sole to be laid.

A further object of the invention is to provide presser structure which possesses maximum flexibility so that thepressure exerted upon operaticn of the actuating means will be uniformly distributed by the presser foottothe sole to be laid.

Another important object is to provide presser structure for the purpose described which may be readily applied on various types of lasting machines.

The above enumerated and other features of my invention are incorporated in the structure disclosed on the drawings, in which:

Figure 1 is a front elevation of a lasting machine showing my improved presser structure thereon;

Figure 2 is an enlarged side elevation of the presser structure; and

Figure 3 is a section on plane III-III of Figure 2.

The lasting machine shown on Figure 1 is that of my Patent No. 2,144,582. Briefly describing the machine, it comprises the bed Iii on which is mounted the base structure ii for supporting the various operating parts. Blocks l2 are slidable longitudinally on the base structure by a shaft l3 operated by a handwheel i4, and these blocks support pedestals l5 for the heel and toe wipers, all as shown in my patent referred to, the drawings showing only the toe wipers [6. Posts i1 rising from the base structure H support the side wiper structures iii. The toe and heel wiper supporting pedestals l5 are connected with cam structure's IS) on the tables 29 for shift of the pedestals crosswise of the machine when these pedestals are moved longitudinally with the wipers thereon, and, as disclosed in my patent referred to, the side wiper structures have connections With the toe and heel wipers for movement Widthwise of the machine when the toe and heel wipers are moved into wiping engagement with an upper.

Describing now my improved presser structure, a supporting pedestal 2! therefor is mounted on the bed l8 and has a sleeve 22 journalled thereon for swing in a horizontal plane. The presser structure comprises the body 23 having a bar 24 extending therefrom for engagement in the sleeve 22 in which it is adjustably secured as by means of a set screw 25.

The body 23 has the vertical bore 26 in which the bar 21 is slidable but held against rotation as by a key 21. The bar has the bore 28 threaded in its lower end for reception of a threaded stem 29 having a polygonal head 30 adjacent its lower end for application of a tool for adjustment of the stem in the bar 21. The end 3| below the head 3!! is secured as by pin 32 to the upper member 33 of a universal coupling Whose other member 34 has the cylindrical socket 35 receiving the stud 36 extending from the support 31 to which the presser foot 38 is secured as by means of screws 39. A link 40 is connected to the coupling member by pins 4| and 42 respectively which extend at right angles to each other. Presser feet of different sizes may be secured to the universal coupling, and each of the feet will have a stud 36 for engaging in the socket 3'! of the coupling. To hold the foot tothe coupling, the stud 36 is provided with a circumferential channel 43 for receiving the end of a screw 34, the screw being applied to extend into the channel to hold the stud against axial displacement but to permit rotary movement of the stud and the foot from which it extends, the screw after setting being held by a lock nut 45. The supporting plate. 31 for the foot is preferably provided with elongated slots 46 for the screw 39 so that the foot may be adjusted longitudinally relative to the supporting plate.

Mounted on top of the bar 2'! is a U fitting 48 having a stud 39 extending therefrom into the bore 28 of the bar, to be secured by a pin 50.

The legs of the fitting 48 support a shaft 5| which journals a roller 52 disposed between the legs. Extending laterally from the upper part of the body 23 are ears 5&- which support a shaft 54 above the shaft 5! for the roller 52, and on the shaft 54 between the ears 53 is journalled a cam 55 for cooperation with the roller 52. Springs 56 extend between the outer ends of the shafts 5i and 54 (Figure 2), these springs tending to hold the bar 2'! in its upper position with the rollerr 52 in engagement with the cam 55. The cam is operable by a handle 5'! and has the cam surface 58 effective, upon clockwise rotation of the cam, to engage with the roller 52 for downward movement of the bar 27 and the presser foot 38 secured thereto by the universal coupling. Figure 1 shows the cam rotated to bring the presser foot into pressing position with a sole S for pressing it downwardly for cementing thereof to the welt portion of a shoe upper which has been wiped around a last supported in the machine, all in a manner as disclosed in my Patent No. 2,144,582. The cam has the locking surface 59 which, when brought into engagement with the roller 52, will lock the handle in its down position for holding the presser foot in its pressing position. To release the foot, the handle 51 is swung upwardly sufficiently to withdraw the holding surface 59 from the roller 52 whereupon the springs 55 will then swing the cam to its normal position and will raise the bar 21 for raising of the presser foot away from the sole. The entire presser structure may then be swung on the pedestal 2| to one side while another upper is being lasted preparatory for thereto.

By adjusting the stem 29 in the bar 21, the pressure engagement of the shoe with a sole will be determined, and after such adjustment a lock nut 63 will hold the stem in its adjusted positon and the connection between the cam and the presser foot will be axially unyielding. Each rotation of the cam 55 to its locking position will then move the presser foot downwardly the same distance, and therefore the presser foot will be applied with the same pressure to a run of uppers which are lasted by the machine.

The foot 33 is provided with a yieldable pad 6 I,

coupling, the foot can be turned to register accurately with a sole before the cam is turned for downward movement of the foot against the sole. The universal coupling will then permit the foot to tilt and rock itself into full engagement with the sole when it is being shifted downwardly by operation of the cam, so that the pressure will be uniformly distributed by the foot to the sole through the pad for proper and uniform cementing of the sole to the upper.

I have thus produced presser structure for lasting and sole laying machines which can be accurately adjusted for the desired pressure application and in which the lateral flexibility of the connection to the presser foot insures uniform pressure application to a sole, and whose operation by the cam insures, by virtue of the axial unyielding of the connection, the application of application of a sole and operation shown and described, as changes and modifications may be made without departing from the scope of the invention.

I claim as follows:

1. Presser structure for the purpose described comprising a body having a vertical bore, a bar movable in said bore, cam means on said body cooperable with said bar for movement thereof, a presser foot having a stud extending therefrom, a universal coupling connected to said bar and having a socket for receiving said stud, said stud having an annular channel, and a screw on said coupling projecting into said channel for holding said foot axially to said coupling but permitting rotational movement relative thereto.

2. A presser structure for the purpose described comprising a body having a vertical bore, a bar shiftable in said bore, a cam roller mounted on the upper end of said bar, a cam mounted on said body for engagement with said roller for downward shift of said bar, spring means tending to hold said bar upwardly in engagement with said cam, a stem having threaded engagement in said bar and depending therefrom, a presser foot having a stud extending therefrom, a universal coupling secured at one end to said stem and having a socket at its other end receiving said stud, said stud having a circumferential channel, and a screw on said coupling projecting into said channel to hold said shoe against displacement from said coupling but permitting rotational movement relative thereto.

3. A presser structure for the purpose described comprising a body having a vertical bore, a bar shiftable in said bore, a cam mounted on said body for effecting downward shift of said bar, spring means tending to hold said bar upwardly in engagement with said cam, a stem having threaded engagement in said bar for axial adjustment relative thereto and depending therefrom, a presser foot, a universal coupling between said presser foot and the end of said stem, said bar and said stem and said coupling providing an axially unyielding connection between said presser foot and said cam, and a yieldable pad on the underside of said presser foot for engagement with soles to be laid.

4. In a lasting and sole laying machine having a supporting base and a wiper assembly mounted thereon, a presser structure comprising a pedestal on the base, a presser body mounted on said pedestal for movement into position over the Wiper assembly, said pressure body having a vertical bore, a bar shiftable in said bore, a cam on said body adapted for camming engagement with said bar to effect downward shift thereof, a stem extending downwardly from said bar, a presser foot, a coupling connecting said presser foot with the end of said stem, said bar and said stem and said coupling providing an axially unyielding connection between said cam and the presser foot, said stem having adjustable connection with said bar for adjustment of the length of said connection whereby for each operation of said cam the same pressure will be transmitted through said connection to the presser foot, and a yieldable pad on said presser foot for uniform distribution of the pressure to soles to be laid on uppers in the wiper assembly.

JOSEPH W. BARNA.

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