US2261198A - Machine for shaping the welts of prewelted uppers - Google Patents

Description

Nov. 4-, 1941. w. A. WHEATON MACHINE FOR SHAPING THE WELTS OF PREWELTED UPPERS Filed Dec. 27, 19.39 2 Sheets-Sheet l Nov. 4, 1941. w. A. WHEA TON 3 L MACHINE FOR SHAPING THE WELTS OF PREWELTED UPPERS Filed Dec. 27, 1959 2 Sheets-Sheet 2 Patented Nov. 4, 1941 MACHINE FOR SHAPING THE WELTS OF PREWELTED UPPERS William A. Wheaten, Lynn, Mass, assignor to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey Application December 27, 1939, Serial No. 311,149 (01. 12,-51)

Claims.

This invention relates to machines for shap ing the welts of prewelted uppers and is herein illustrated and described as embodied in a' machine having a pair of rolls between which the work passes. These rolls not only feed the work but operate also to shape it to the desired form.

The illustrated machine is intended particularly for operation upon welts of the type disclosed in United States Letters Patent No. 2,119,- 801, granted June 7, 1938, on the application of W. C. Vizard. This welt is made from strip material substantially rectangular in cross section. Two slits are made in one edge of the strip extending inwardly for about a half thewidth of the strip, dividing one marginal portion 'of the welt into three flaps. Th margin of the shoe upper is secured between two of these flaps, while the third flap is left free for subsequent attachment to an insole. The unslit margin of the welt strip constitutes the usual extension for attachment to an outsole. However, before this extension can be secured to the outsole it must first be turned outwardly relatively to the two flaps between which the margin of the upper has been attached. Because of the thickness of the welt at the point where the crease is to be formed considerable pressure is required to do this.

' It is an object of the present invention to provide a machine particularly adapted for performing the shaping operation above described. In accordance with an object of the invention, the illustrated machine is provided with a pair of parallel rolls between which the work piece may be pressed, one of the rolls having a portion of its periphery tapering and having adjacent the small end of the tapering portion a flange for engaging an edge of the work piece. This flange engages the end of the outsole extension of a welt of the type under consideration to prevent the welt from being forced out between the ends of the rolls. The other roll, as shown, is in the form of a pair of stepped cylinders, the cylin-- der of smaller diameter cooperating with the tapered portion of the first-mentioned roll. As the welt passes between the rolls, the outsole extension is bent back upon the two flaps between which the margin of the upper is attached. .The free flap of the welt which is later to be attached to the insole passes between cylindrical portions of both rolls. The invention further consists of various features of construction and combinations of parts herein disclosed and claimed the advantages of which will be apparent to those skilled in the art, reference being had to the accompanying drawings, in which Fig. I is a side elevation of the improved machine; and

Fig. 2 is a side elevation on an enlarged scale showing the rolls of the machine in. operation upon a welt.

The supporting structure of the improved machin comprises a frame having a stationary portion In adapted to be secured upon a work table. Upon a fulcrum pin I2 in the frame In ispivotally mounted a head I4; Journaled in suitable bearings formed in the stationary frame member I 0 is a countershaft I6 driven by a pulley l8 from a belt 20 and carrying a gear 22. Also journaled in bearings formed in the frame member III is a shaft 24 paralle1 to the shaft l6 and driven through a gear'26 in engagement with the gear 22. Journaled in suitable bearings formed in the head 14 is a shaft 28 substantially parallel to the shafts 24 and i6 and driven through a gear 30 which engages the gear 26. In order to provide for'adjustment of the head l4 in a direction parallel to the three shafts above mentioned the head is provided with a slot 32 engaging the pin I2 and extending in a direction parallel to the three shafts. Such adjustment of the head is effected through a screw 34 threaded into the frame member ID and extending through a vertical slot in a lug 36 on the head M. A head 38 and acollar 40 on the screw 34 engage opposite sides of the lug 36 to prevent endwise movement of the screw relatively to the lug. The head I4 is normally held down to a stop positionby a' spring 42 surrounding a rod 44,1one end of thespring abutting an under surface of the frame member ID and the opposite end of the spring abutting a nut 46 threaded upon the lower end of the rod 44 to provide adjustment of the pressure of the Sp ing. The rod 44 passes upwardly through a bearing 48 on the frame member Ill and at its upper end is enlarged and horizontally slotted for engagement with a pin 5n secured' in the head [4. The stop position of the head 14 is determined by a screw 52 threadedinto the frame member ID and engageable with the collar 40 to limit downward movement of the head l4. To provide for raising the head [4 for the introduction of the work piece, the rod 44 has a lateral extension 54 which is engaged by a lever 56 fulcrumed upon a pin 58 secured in the frame member ID. A rod 60 connects the lever 56 with a treadle (not shown). The frame member ID has a pair of upwardly extending portions 6| which engage opposite sides of the head [4 and serve as guides to support the head against-lateral movement.

Keyed upon an end of the shaft 28 is an upper roll 62. A washer 64 engaged by the head of a screw 66 which is threaded endwise into the shaft 28 holds the roll upon the shaft. The periphery of the roll 62 has a cylindrical inner end portion 68, an intermediate portion which tapers from the diameter of the cylinder 68 to a less diameter, and an outer end portion 12 tapering sharply to a larger diameter from the small end of the intermediate portion 10 and forming the inner surface of an end flange. The roll 62 is mounted upon the shaft 28 with the portion 12 adjacent to the end of the shaft. The intermediate portion 10 is not strictly conical but slightly concaved.

Secured upon the shaft 24 below the roll 62 is a roll 14 having its periphery in the form of two stepped cylinders 16 and 18 of greater and less diameters respectively. The cylinder 18 is adjacent to the end of the shaft 24 and coop-' erates with the tapered intermediate portion 10 of the roll 62, while the cylinder 16 cooperates with the cylindrical portion 68 of the roll 62. The shoulder between the cylinders 16 and I8 is rounded off as indicated by the reference character 80. The cylinder 16 overextends the cylindrical surface 68 widthwise with the shoulder 80 extending slightly beyond or to the right of the junction of the cylindrical surface 68 and the tapered surface 10. The exact amount by which the shoulder 80 extends to the right beyond the cylindrical surface 68 is important, and is determined by adjustment of the screw 34. The roll 14 is fixed upon the shaft 24 by a countersunk washer 82 which is engaged by the head of a screw 84 threaded endwise into the shaft.

Mounted upon the outer end of the head I4 is a guide 86 having a slot 88 through which extends a clamping screw 90 threaded into the head M. The slot extends heightwise and provides for vertical adjustment of the guide. Thelower end of the guide is hook-shaped and has an end portion inclined upwardly and inwardly, or backwardly from the position of the operator, and also to the right. On this end portion is formed a smooth guiding surface 92 for engagement with the work piece.

The operation of the rolls is'illustrated in Fig. 2. The work piece comprises a welt W secured to the marginal portion of the upper of a shoe S. The welt W comprises an outsole attaching extension E which represents the full thickness of the material from which the welt is made, and three flaps F F F which together make up the thickness of the welt material. The upper of the shoe S; as shown, is secured between the flaps F and by stitching whilethe flap F (which has been turned away from the other flaps during the stitching of the upper) is freefor subsequent attachment toan insole; Before the operation which is to be performed by this machine, the various portions of the welt W occupy the relative positions indicated in the section identified by the reference numeral 94 in Fig. 2. The operation consists in bending back the extension E from theposition shown at 94 to the position shown in the section indicated by the reference numeral 96. To insert the work in the machine, the operator first bends back a small portion of the extension E and depresses the treadle, to raise the upper roll 62 which enables him to insert the welt between the rolls in the position shown in section 96. Upon release of the treadle the spring 42 causes the roll 62 to bear down upon the welt with sufiicient pressure to urge the extension E downwardly against the base of the flap F and to form a definite crease between the extension and the flap. The rotation of the rolls thereupon feeds the work progressively, away from the operator, until the locality at which the welt was inserted has been reached again. The guide 86 is not engaged by the flap F but only by the extension E. As the work advances the guiding surface 92 helps to raise the extension thereby facilitating the work of the rolls. The pressure upon the welt is greatest between the cylinder '18 and the tapered portion 10 at a locality close to the shoulder 80. The tapered surface of the flange 12 engages the outer edge of the extension E to prevent the work from being squeezed out from between the rolls. The concavity of the surface 10 enables greater downward pressure to be imposed upon the outer portion of the extension E, which flexes, than could be obtained by a conical surface. The flap F passes between the cylinder 16 and the cylindrical surface 18 which grip it with a pressure sufiicient to aid in feeding the welt, but not great enough to lessen the concentration of pressure at the locality above mentioned.

When the work is removed from between the rolls, the extension E will not resume the original position indicated at 94 but will tend to extend out at a sharp angle from the flap E. This condition of the welt facilitates the laying and stitching of the outsole, and insures that the welt will lie flat without beating.

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

1. A machine for shaping the welts of prewelted uppers, comprising a pair of rolls having opposed cylindrical portions for gripping and feeding a flap of a welt, one of said rolls having a portion of its periphery tapering to bend the outsole attaching extension of the welt away from said iiap and having also at the small end of said tapering portion a flange for engaging the edge of the outsole attaching extension to prevent the welt from being squeezed out from between the rolls.

2. A machine for shaping the welts of prewelted uppers, comprising a pair of parallel rolls between which a welt may be pressed, one of said rolls having its periphery tapering to a less diameter toward the end of the roll for bending the outsole attaching extension of the welt and having adjacent to the small end of said tapered portion a flange for engaging the edge of said outsole attaching extension to preventthe welt from being squeezed out from between the rolls, the other of said rolls having a peripheral portion which is closer to said tapered portion at the larger end of the tapered portion than at the smaller end, and means for driving one of said rolls.

3. A machine for shaping the welts of prewelted uppers, comprising a roll having a portion of its periphery tapering for bending the outsole attaching extension of the welt and having adjacent to the small end of said tapering portion a flange for engaging said outsole attaching extension to prevent the welt from being squeezed out from between the rolls, a roll parallel to the first-mentioned roll and having the portion of its periphery which is adjacent to the tapering portion of the first-mentioned roll substantially rolls.

4. A machine for shaping the welts of prewelted uppers, comprising a roll having an end portion of its periphery cylindrical, an intermediate portion tapering to a less diameter from said cylindrical portion, and an end portion tapering to a greater diameter from the small end of said intermediate portion, and a roll parallel to the first-mentioned roll with its periphery in the form of stepped cylinders of greater and less diameter respectively, the cylinder of greater diameter being in operating relation to the cylindrical portion of the first-mentioned roll to provide a relatively small space therebetween and the cylinder of less diameter being in operating relation to the intermediate portion of the first-mentioned roll to provide a relatively large space therebetween.

5. A machine for shaping the welts of prewelted uppers, comprising a roll having an end portion of its periphery cylindrical, an intermediate portion concave and tapering to a less rounded off.

WILLIAM A. WHEATON.

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