US2316125A - Shoe upper pressing and shaping machine - Google Patents

Description

pr 1943- J. F. SMITH I 2,3,15,125'- SHOE UPPER PRESSING AND SHAPING MACHINE Filed March 22, 1940 Patented Apr. 6, 1943 SHOE. UPPER PRESSING AND SHAPING M'ACHINE.

J ohn F. Smith, Quincy, Mass.,-assignor to Milton L. Dodge, Newburyport, Mass.

Application March 22, 1940, Serial N 0. 325,379 9 Claims. (01. 12 51) This invention relates to machines for pressing and shaping shoe uppers. One example of a machine for this purpose is shown in the Dodge application Serial Number 604,455 filed April 11, 1932, for Method of shaping shoe uppers, which on April 16, 1940, eventuated into Patent No. 2,197,208.

In this machine a form over which the shoe is placed is carried by a gooseneck bracket in position for side pressing forms to move inwardly from opposite sides toward the form and subject the upper of a shoe on the form. to the desired shaping pressure, the pressure being applied by the operator. While this pressure should be considerable, as it is applied through a toggle mechanism, it may be done without undue effort by the operator, but it has been found that some operators, actingon the apparent belief that if heavy pressure is desirable, the heavier the pressure the better, have exerted a quite unnecessary heavy pressure which has caused damage and sometimes even breakage of machine parts. I

The present invention, therefore, has for an object to provide a mechanism for insuring a desirable heavy but uniform pressure not dependent on the exertion of the operator for its amount, but re'gul'able 'in accordance with the optimum requirements for the particular work. To this end the application of the pressure may be produced by fluid pressure mechanism, there being means by which the amount of the fluid pressuremay be regulated. Thus a uniform pressure regardless of thickness of upper materials and regardless of the strength of the operator may be maintained. For a more complete understanding of this invention, reference may be had to the accompanying drawing, in which:

Figure 1 is a perspective view of a machine having a bank of pressing units embodying this invention. 7

Figure 2 is a fragmentary view showing one of thepressing units in front elevation.

Figure .3 is a diagrammatic view illustrating the. fluid pressure system with connections for one of the unit's.

Referring to the drawing, at i is indicated a supporting table orbench to the top face of which is secured a plurality of gooseneck brackets 2. Each bracket carries depending from its forward extremity a form 3 over which a shoe may be placed, the upper of which is intended to be treated by the forming and pressing mechanism. For the purpose of the present invention any desired type of inner form may be employed, but

as shown it comprises two parts which are ar- 3 comprise a supply tank 20, and a pump 21 for 'ing the liquid from the supply chamber 20 ranged to be expanded to an adjustable extent to conform to the requirements of the particular shoe being operated upon. For pressing the shoe upper against each of these forms is a pair of side presser members 5. Each of these sid presser members is shown as carried at the upper end of a lever '6, these levers being arranged in pairs as shown in Figures 1 and 2, and each being fulcrumed as at I to a suitable portion of the table I. The lower ends of the arms or levers 6 extend below the pivots 1 and have at their lower ends rollers 8. Between the rollers 8 of each opposed pair of arms 6,there is positioned a wedge block 9 havingits wider end upwardly presented and having inclined sides l0 adapted to be engaged by the rollers 8. Thus as the wedge member 9 is depressed the faces l0 engaging the rollers 8 progressively rock; the lower ends of the arms 6 outwardly and bring the side pressing members 5 toward the central form 3. These side forms are so shaped that they cause the shoe upper to be pressed against and conformed to the contour of the inner form. t

In accordance with this invention means are provided for insuring that the wedge member 9 is drawn between the rollers 8 with a predetermined pressure, and for this purpose a fluid pressure moving mechanism is employed and preferably one containing an incompressible fluid such as oil, such a system being generally referred to as a hydraulic system. To this end each of the wedges 9 is connected at its lower end to a piston rod II to which a piston [2 working in the hydraulic cylinder I3 is attached. Pipes l4 and I5 may be employed to supply and discharge the liquid from opposite sides of the piston l2 to move the piston in opposite directions.

As shown in Figure 3 the hydraulic system tak- and introducing it into a pressure supply pipe 22. The discharge from the pump 2! has located therein an adjustable pressure relief valve as at 23. This pressure relief valve, as shownyhas avalve element 24 normally seated in a port 25 and-backed up by a spring 26, the tension of whichmay be adjusted as by turning a shaft 21 threaded through the outer end of a valve casing 28. For the purpose of regulating this pressure relief valve 7 to relieve pressure lineZZ of any pressure in excess of a desired predetermined amount, this threaded shaft?! may be provided at its outer end with an actuating wheel 29. This wheel may be located accessible to the operator at the forward face of the table I. The response to the adjustment may be indicated to the operator as by the pressure gage at 30, deriving its fluid under pressure from any suitable part of the pressure supply as from the pressure line 22.

The pressure line 22 is connected as through a pipe 3! and a check valve 32 to each of the controlling valves 33. This controlling valve 33 controls the connection of the pipes l4 and [5 to the pressure supply line 3| and to the discharge line 34 which leads back to the supply 20. By manipulation of the valve 33, fluid under pressure may be caused to act on either face of the corresponding piston l2, thus to drive its wedge 9 downwardly and apply pressure against the upper of a shoe on the corresponding form, or to lift the wedge 9 and thus relieve pressure on the shoe upper.

Any suitable means such as a spring 40 may be employed to swing the outer presser members and the upper portions of the arms 6 outwardly when the wedge 9 is being moved upwardly, thus to release the shoe from the forming pressure. I

It will be noted that there is an actuating handle 4| accessible to the operator at the forward face of the table I and that there is an individual valve 33, for each of the pressing units, each such pressing unit comprising a central form to receive the shoe, the side presser members for pressing the sides of the shoe upper against the form,

and the controlling and actuating mechanism.

There is, however, only a single pressure relief valve so that all the pressing units in the one bank have their maximum pressure set at the same point. The pressure relief valve having been set to the desired pressure, and the valve 33 of one of the pressing units being in the position' to admitfiuid under pressure beneath one of the pistons l2 and to discharge fluid from above that piston, so that the side members for one unit are spaced from the form, a shoe is placed over this form, which is adjusted to fit it, whereupon the valves 33 are turned by the operator to reverse the fluid connections to the cylinder l3, thus drawing down on the wedge block 9 and causing the side presser members 5 to close on the shoe upper under forming pressure. After a suitable, time, the valve is turned to admit fluid beneath the piston' IZ'fand to discharge fluid from about it, opening the pressing mechanism for the removal of the treated shoe and the insertion of an untreated shoe.

From the foregoing description of an embodiment of this invention, it should be evident to those skilled in the art that various changes and modifications might be made without departing from the spirit or scope of this invention as defined by the appended claims.

Iclaim: I r g 1. In combination, shoe upper pressing means,

and means including a pressure limiting device for actuating said pressing means to press a shoe upper with a definite maximum pressure applied by said pressing means regardless of the thickness of said upper. V

2. In combination, shoe upper pressing means, fluid pressure mechanism for actuating said pressing means, and means for predetermining the amount of such fluid pressure and thereby controlling the pressure exerted on said upper.

3. The combination with a form over which the upper of a shoe may be placed, and means for pressing a shoe upper on said form against the surface of said form, of fluid pressure means for actuating said pressing means, and pressure limiting means determining the amount of such fluid pressure and thereby controlling the pressure exerted on said upper during a pressing operation.

4. The combination with a form over which a shoe may be placed, side presser members, pivoted arms carrying said presser members for motion from and toward the sides of said form, of a wedge member mounted for motion between said arms to swing said arms in pressing directions, and means acting with a predetermined force for moving said wedge member in pressing direction.

5. The combination with a form over which a shoe may be placed, side presser members, pivoted arms carrying said presser members for motion from and toward the sides of said form, of a wedge member mounted for motion between said arms to swing said arms in pressing directions, fluid pressure means for moving said wedge member in pressing direction, and means for fixing the pressure of the fluid in said fluid pressure means.

6. The combination with a form over'which a shoe may be placed, side pressure members, a source of fluid pressure, fluid pressure operated means for moving said side presser members to bring said presser members toward said form, and means for controlling the supply of fluid under pressure from said source with respect to said fluid pressure operated means.

7. The combination with a form over which a shoe may be placed, side presser members, arms carrying said presser members for motion from and toward the sides of said form, a source of fluid pressure, fluid pressure operated means for moving said arms to bring said presser members toward said form, and means for controlling the supply of fluid under pressure from said source with respect to said fluid pressure operated means. i

8. The combination with a form over which a shoe may be placed, side presser members, arms carrying said presser members for motion from and toward the sides of said form, a source of fluid pressure, means deriving fluid under pressure from said source for moving said arms to bring said presser members toward said form, and a pressure relief valve in controlling relation to fluid used by said moving means to' determine the maximum pressure exerted between said pressure members and form.

9. The combination with a form on which a shoe may be placed, side presser members, a source of fluid pressure, means for supporting said side presser members for motion of said member toward from said form, and means deriving power from said source for actuating said supporting means to bring said presser members toward said form, and a pressure limiting device in controlling relation to the fluid from said source which operates said actuating means.

JOHN F. SMITH.

Petent No. 2,516,125.

. CERTIFICATE or CORRECTION.

' April 6, 191; JOHN F. SMITH.

It is hereby certified that error appears in the printed spemificsltion" 0f the Above numbered patent requiring correction as follows: Page 2, second colnmn, line 60, claim 9, after the word "toward" insert --and--; same line before the word "means" strike out a nd--; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the casein the Patent Office.

Signed and sealed this 25th day of May, A. D. 19LL5.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents. 4

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