US2356241A

US2356241A - Prewelt lasting machine

Info

Publication number: US2356241A
Application number: US499529A
Authority: US
Inventors: Eric A Holmgren
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1943-08-21
Filing date: 1943-08-21
Publication date: 1944-08-22
Anticipated expiration: 1961-08-22

Description

Au 22, 1 944. E. A; HOLMGREN I PREWELT LASTING MACHINE Filed Aug. 21, 1943 2 Sheets-Sheet l In me n for Eric AHolmgr-eh' E. A. HOLMGREN PREWELT LKSTING MACHINE Filed Aug. 21, 1945 2 Sheets-Sheet 2 In venzor Eric A HoLmgren Patented Aug. 22, 1944 S PATENT OFFICE PREWELT LASTING MACHINE Eric A. Holmgren, Beverly, Mass.,' assignor to United Shoe Machinery Corporation, Fleming- 'ton, N. J a. corporation of New Jersey Atpiicaiot August 21, 1943, Serial No. 499,529

13 Claims.

This invention relates to machines for use in the manufacture of shoes and is herein illustrated in its application to machines for lasting shoes the uppers of which are provided with outward extensions to which soles are secured. The

invention is herein illustrated as embodied in a machine for lasting prewelt shoes, but it is to be understood that the invention is not thus limited in its scope, the invention in certain aspects being. applicable generally to machines for lasting uppers having outward sole-attaching extensions, including for example the uppers. of shoes of, the

stitchdown type.

It is an object of the present invention to provide a machine for eificiently and economically lasting shoes the uppers of which have outward sole attaching extensions. It is a further object of the invention to provide a machine, which will reliably effect the cement-attachment of the outward sole-attaching extension of the upper to the extension of the sole.

With the above objects inview the, present invention, in one aspectthereof, consists in the provision in a machine for lasting uppers having outward sole-attaching extensions or flanges, of

lasting means, and sole-supportingmeans constructed and arranged to present a reentrant angle to the supported sole. Features of the invention reside in rotary sole-supportingmeans having sole-supporting surfaces presenting a reentrant angle to the sole. As herein illustrated the sole-supporting means comprises two rolls having, respectively, cylindrical and frusto conical peripheral surfaces constructed and arranged to support the vsole. Preferably, the cylindrical roll engages the margin of the sole and the frustoconical roll a portion of the sole adjacent to its margin. To effect the cement-attachment of the extensions of the upper and the sole-supporting rolls are mounted on a carrier and means is provided for operating against said carrier to cause the rolls to press the sole against the outward extension of the upper. Y I I In another aspect thereof the invention consists in the provision in a machine of the type above described of a rotorconstructed and arranged to engage the sole-attaching extension of the upper and .means for continuously driving said rotor tocause the point of operation of .the

machine on the shoe to advance continuously about the periphery of the shoe bottom, the shoe being supported on means mounted to rotateidly during the operation of said-rotor... ,For gaging the position of the shoe in the machine, the illustrated rotor, in accordance with another feature of the invention, is provided with means herein illustrated as a cylindrical hub serving as an edge gage for the extensions of the sole and the welt.

In another aspect thereof the invention consists in improvements in a machine for securing soles to uppers having outwardly extending soleattaching flanges which machine may or may not perform a lasting operation depending upon whether the upper is mounted on a last or whether the shoe is made off the last in accordance with methods such, for example, as that set forth in my copending application, Serial No. 466,975, filed November 26, 1942. Said improvements comprise a rotor constructed and arranged to engage the outwardly extending sole-attaching flange of the upper and sole-supporting means herein illustrated as rolls having work-supporting surfaces presenting a reentrant angle to the work.

These and other features of the invention will now be described with reference to the accompanying drawings and pointed out in the appended claims.

In the drawings,

Fig. 1 is a perspective view of a machine embodying the features of the present invention; and

Fig.2 is a side elevation, partly in section, showing the head of the machine, and, also in section, a portion of a prewelt shoe being operated upon.

Referring to Fig. 1, the illustrated machine comprises a standard l0 extending upwardly from a base I2 to which there is bolted a bracket 14 which supports a motor I6 which operates a work-feeding and pressing means hereinafter described.

For supporting a prewelt shoe :by engagement with the margin of the outsole two rolls l8 and 20 are pivotally mounted on a bracket 22 arranged to support-the rolls at an angle of approximately 45 to the horizontal with the upper portions of the edge faces of said rolls directed away from the machine standard. This arrangement of the work-supporting rolls permits the operator to hold the shoe in a convenient position during the operation of the machine.v The bracket 22 is secured to the upper end portion of a vertical shaft 24 slidably mounted in bearings provided in

brackets

26 and 28 secured to the front of the machine standard Iii. The .worksupporting rolls are urged upwardly by a spring 30, the lower end of which is anchored in a fixed position on the standard 10 while the upper end engages the rear portion of a lever 32 pivotally mounted at 34 on brackets BBextendingforwardly from the machine standard. Said lever has upward extensions which terminate in curved cam rails 38 which act on rolls 40 carried by the shaft 24. The cam rails 38 are so arranged that the movement of the lever 32 by the spring 30 produces an upward movement of the shaft 24 whereby the rolls i8 and 20 are pressed upwardly against the work. In order that the upward pressure of the

rolls

18 and 20 against the work may bend the outward extensions of the Welt and the sole upwardly to reduce the welt crease, the periphery of the forward roll 20 is made frusto-conical with its larger diameterforemost while the periphery of the roll I8 is made cylindrical and of the same diameter as the smaller diameter of the frusto-conical roll '20. Thus'the two work-supporting rolls present two work-supporting surfaces arranged at a reentrant angle somewhat less than 180 to each other and this angular relation of the work-supporting surfaces of'the rolls has an upward bending effect on ;the outwardly extending marginsof the welt and the outsole, as illustrated in Fig. 2. The .use of two work-supporting rolls l8 -and 2ll rather than a single roll having the illustrated peripheral con struction facilitates the operation of .the machine around the toe end and the heel-end of the shoe since the rolls l8 and 20 may have -a differential movement corresponding to the difference in length of the tracks of the rolls on thecurved end portions of the sole. In order to facilitate the positioning of a shoe, for example the shoe 42 illustrated in Fig. 2, on the work-supporting rolls, a treadle -44 is provided for causing the work-supporting rolls to move downwardly into shoe-receiving position,-said treadle being connected to the forward portion-of the lever 3-2 by a link 46.

For cooperating with the rearmost work-supporting roll [8 to press the welt and the outsole together, a generally 'frusto-conical roll 48 is 'arranged to rotate on an axis at'right angles to the axis of the rolls l8 and 20 in order to position the flat bottom surface of the roll 48 'for engagement with the upper surface of the welt 49. The roll 48 is so positioned relatively to the rolls l8 and 20 that when its margintis positioned within the welt crease, as shown in Fig. '2, the

outsole is positioned on the rolls l8 and 20 with 1 its edge face substantially in the plane .of the rearmost surface of therroll 18.

To cause the point of operation of the machine onthe shoe to advance in a regular, continuous manner about the periphery of the shoe bottom the roll 48 is rotated by the operation of the motor 18 hereinbefore referred to. To this end the motor operates a belt 50 mounted on a pulley 52 (Fig. 2) secured to a countershaft 54 which also has secured thereto a much smaller pulley .56 which turns a large pulley Sii secured to the real-portion of a shaft 82 journaled in a bearing at the top of the machine standard it]. The shaft "52 operates the roll 48 through .reduction gearing comprising

bevel gears

64 and 66 and spur gears 68, ll 12, and 74, the latter being secured to a shaft 76 on which the workengaging roll 48 is mounted.

To assist the operator in positioning the welt 49 and the sole l8 relatively to the work-supporting rolls i8 and .29, the roll 48 is provided with a downward extension or-hub 80 having a cylindrical periphery 82 which provides a gage for th welt and the outsole.

In the-operation of themachine theloperator first depresses the treadle 44 to cause the worksupporting rolls l8 and 20 to move downwardly to permit the outwardly extending margins of the welt and the outsole, which have been coated with suitable adhesive, to be inserted between the work-supporting rolls and the welt-engaging roll 48. After the shoe is correctly positioned with relation to the rolls the operator permits the treadle 44 etO move upwardlyuntil .the rolls l8 and 20 press the outsole against the welt and the welt against the roll 48, which is continuously rotating and immediately commences its workfeeding operation as soon as the welt is pressed against it. The operator maintains a continuous pressur against the shoe to hold the adjacent ledge ,faces .of the welt and the outsole against the gage face 82 of the roll 48 as the rotation of saidroll 'transfersthe point of operation continuously in a regular, uniform manner about the periphery of the shoe bottom. The operation continues about:the entire periphery of theshoe bottom and if desirable :may proceed about the shoe bottom. a second time'to iinsure-aisatisiactory bond (between :the welt and the outsole.

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

1. In a machine for :lasting :uppers having outwardly extending sole-attaching flanges, lasting means, andsole-engaging zmeans constructedand arranged to present-a reentrant'angle to'the sole.

' 2. Inamachine for lasting uppers .havingoutwardly extending sole-attachingflanges, lasting means, and sole-supporting means constructed and arranged to-present-a .reentrantangle tonthe supported sole.

3. In a 'machinefor lasting uppersrhaving out- =wardly extending sole-attaching flanges, lasting means, and rotary sole-engaging means having sole-engagingsurfaces presentinga reentrant angle to the sole.

4. In a machine for=lasting uppers having outwardly extending sole-attaching fianges, sole- -engaging means comprising two rolls having, respectively, cylindrical andirusto-conical sole-engaging surfaces.

-5. Ina machine forlasting:uppershaving outwardly extending sole-attaching flanges, sole-engaging .means comprising two rolls having, respectvely, cylindrical and "frustoeconical sole-engaging surfaces, the-cylindrical roll-engaging the margin of the :sole, and the frusto-conical roll -a 4 portion adjacent to its margin.

6. Ina machine for lasting uppers having outwardly extendingsole-attachingflanges, sole-engaging means comprising -two rolls having, respectively, cylindrical and 'frusto-conical soleengaging surfaces, 'a carrier for said rolls, and means for actuating said carrier to cause said rolls to press the soleagainstthe=outwardly extending sole-attaching flange of .the upper.

'7. -In-a machine-for lasting uppers having outwardly extending sole-attaching flanges, lasting means comprising a rotor constructed and arranged toengage said flange idly rotating means constructed and arranged to holdthe'margin of a sole againstsaid fiange and means for actuating said rotor to cause the ,point of operation of the machine'on the shoe to advance-in a continuous mannerabout the periphery of the shoe bottom.

8. Ina'machinelfor lasting upperslhavingoutwardly extending :isoleeattaching flanges, lasting means comprising :a .rotor constructed .and arranged to engage said outwardly extending flange, rotary sole-supporting means constructed and arranged to hold the sole against said flange while the work is fed to cause the point of operation of the machine on the shoe to advance about the periphery of the shoe bottom, and

means on said rotor for gaging the position of ranged to engage said outwardly extending v flange, rotary sole-supporting means constructed and arranged to hold the sole against said flange while the work is fed to cause the point of operation of the machine on the shoe to advance about the periphery of the shoe bottom, and a cylindrical hub on said rotor providing an edge gage for [positioning a shoe in the machine.

10. In a machine for securing soles to uppers having outwardly extending sole-attaching flanges, a rotor constructed and arranged to engage the sole-attaching flange, and rotary soleengaging means presenting a reentrant angle to the work.

11. In a machine for securing soles to uppers having outwardly extending sole-attaching flanges, a driven rotor constructed and arranged to engage the outwardly extending flange of the upper, and two idle sole-engaging rolls having work engaging surfaces presenting a reentrant angle to the sole.

12. In a machine for securing soles to uppers having outwardly extending sole-attaching flanges, a driven frusto-conical rotor constructed and arranged to engage the outwardly extending flange of the upper, two idle sole-engaging rolls, one having a cylindrical surface which engages the margin of the sole, and the other having a frusto-conical surface which engages a portion of the sole adjacent to its margin, a carrier on which said idle rolls are mounted, and means for actuating said carrier to cause said rolls to press the sole against the outwardly extending flange of the upper.

13. In a machine for securing soles to uppers having outwardly extending sole-attaching flanges, a rotor constructed and arranged to act on the outwardly extending flange of the upper and means for supporting a sole and pressing it against the outwardly extending flange of the wpper comprising rotary sole-engaging means, a carrier on which said sole-engaging means is mounted, and means for actuating the carrier to urge said rotary sole-engaging means toward the rotor.

ERIC A. HOLMGREN.

CERTIFICATE OF CORRECTION.

Patent No., 2, 56,2L 1O August 22, 19th.

ERIC A. HOIMGRENQ It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, first column, line 59: before "s0l-su'pport" insert -sole the--; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed'and sealed this 10th day of October, A. D. 191.1140

Henry Van Arsdale (S Acting Commissioner of Patents.