US2388726A - Back part forming machine - Google Patents

Description

Nov 13, 1945.

E. R. DAVIS BACKPART FORMING MACHINE 2 Sheets-heet l Filed Sept. 25, 1943 Wm 4 a Inventor: Emery R Dcwls.

Nov. 13, 1945. E. R; DAVIS 2,388,726

BACKPART FORMING MACHINE Filed Sept. 25, 1945 2 Sheets-Shet 2 r 2 8 p 2 M Inventor.

Emel g R Davis A Patented Nov. 13, 1945 :Emerylt. Dauis, Beverly, Mass.,.assi gnor to United shoclMachinery CorporatiomFlemington, N. ".L, a corporation of .New Jersey Application September 25, 19/13, Serial :N 0. 503,557

9 Claims.

This invention relates :to machines for use in the :iormation of ibackparts of shoe uppers and :more particularly i130 machines for ruse in carrying :out the method and donning the article of manufacture aof application for Letters Patent of the United States, Serial "No. 4595926, filed September -28, 1'942in the :name ofMerwinF. Ashley.

In accordance with the method :covered by the .above application, =.a backpart is formed by turning the marginal :portion of a hat backpart blank to form a heebattaching flange and an edge crease. The flange thus formed is corrugated without substantially stretching the material of which the flange formed. By thus corrugating the-margin after the flange is-formed the cor- 'rugations .are readily confined :to the flange as the backpart is molded to final shape and objectionable wrinkles visible in the finished shoe are avoided, as discussed in-detail the aforementioned application.

The formation of the corrugations in the flange is effected insuch manner as :to preform the blank i-n'to somewhat the shape of a finished backpar-t. This is accomplished by formingeach of the corrugations of varying depths, the deepestpor tions of the "corrugations being along the edge of the flange, thereby to foreshorten it. causes the blank to assume -a curved shape and by forming thecorrugations in'only the heelend portion of the blank, the curvature is confined to this portion and the sides remain straight, so that the shape of the blank'approximates that of a finished backpart, and a minimum of final molding of the blank is required to form it to finished shape.

An object of the present invention is to provide improved mechanism for operating on flat backpart blanks to carry out the method of the aforementioned application. To this end, .and'in accordance with a feature of the invention, the machine includes a pair of cooperating rolls arranged to act progressively, upon opposite sides of the blank-to flange the lower marginal portion and form a well defined edge crease. A second pair of rollsacts progressively pon the flange of the blank after the flange has been formed by the first pair of rolls to impress corrugations therein. The rolls of the second pair are provided with intermeshing teeth and the rolls :are mounted with their axes at a g es to each other so that the depths of the corrugations formed in the -flange decrease inwardly from the edge thereof. Provision is made for separating the second pair of rolls at will to such an extent that-they become "ineffective to corrugate theflange so that the corrugations in the :flange may ibe limited to the '-heelend portion of the blank.

The above and other features :of the invention will :now :be described '-with reference to the accompanying drawingsand pointed out in the claims. 1

Inthedrawings,

Fig. 1 is a front elevation 'of one form of mechanism in which the invention is embodied;

Fig. 2 is an end elevation partly in "section of the head of the machine, thisview being taken from the left of Fig. 1 and illustrating the conru gating rolls;

Fig. 3 is a front elevation of the head of the machine illustrating "the action of the :corrugating rolls on the work;

Fig. 4 is a vertical section through :the machine looking toward the left illustrating the flange-formin rolls acting on a work piece;

Fig. '5 is'a perspective viewof the flange-forming rolls illustrating their action in turning the flang'e on the marginal portion of a "flat 'backpart blank; and

Fig. 6 is a perspective viewer a blank af-terit has been acted upon by the machine illustrated herein.

In the illustrated embodiment of the invention, the machine comprises a housing Ill having a head II in which aresupported a pair of flange-forming rolls 12, -14 and a pair of corrugating rolls '16 and 1-8. Theflange-"forming-roll M has a V-shaped periphery with which cooperates the roll 12 having a complemental periphery, the rolls acting on a backpart blank B introduced therebetween to bend the lower marginal portion to form a flange F and an edge crease C. The sides of the V of -roll M are at right angles to each other, .as shown clearly in Fig. 4 so that the flange F formed by the rolls lies at an angle of substantially with respect to the rest of thebackpartblank.

The rolls l2 and M are mounted on shafts 2-0 and 22 respectively journaled in the head ll of the housing l0, these shafts being parallel to each other and extendin downwardly and rearwardly at an angle of approximately 45 to the horizontal so that the ilange F formed by the corrugating rolls 'will lie in a horizontal position to be subsequently acted upon by the cor-rugating "rolls, as will be described. The shaft 20, carrying the flange for-ming roll 12, carries at its inner en-(1a bevel gear 24 meshing with a bevel gear '26 on a vertical shaft 28 journaled in bearings 30 and 32 in the housing N]. "The lower end of the shaft 28 is connected by bevel earing 34 to a counter-shaft 36 extending outwardly of the housing and carrying a pulley 38 connected by a belt 48 to a suitable driving means. The flangeforming roll I2 is rotated continuously during the operation of the machine, whereas the shaft 22 carrying the roll [4 is not connected to the driving means and the roll turns freely although it will be understood that the shaft 22 may be driven with the shaft 28 if desired by any suitable means. In turning the marginal portion of the backpart blank to form the flange F and the edge crease C, the blank is introduced between the rolls I 2 and I4 with the lower edge of the blank against a surface 42 which acts as a gage to determine the width of the flange to be formed.

The rolls l2 and M are so spaced that they grip the opposite sides of the blank firmly and the blank is fed therebetween during the formation of the flange, as illustrated in Figs. 4 and 5.

The corrugations in the flange of the blank are formed without substantially stretching the material of the blank by the action of the corrugating rolls l8 and I8 in progressively forming the corrugations. The corrugations are thus formed by foreshortening the flange as contrasted from forming them simultaneously between a pair of molds, in which case the material between the corrugations must be stretched. The rolls l6 and I8 are provided with intermeshing teeth 44 of uniform depth and the axes of the rolls, as best shown in Fig. 2, are arranged at an angle to each other so that the corrugations formed thereby are deepest at the outer edge of the flange and decrease in depth toward the edge crease C and terminate just short of the edge crease. In this manner the greatest amount of foreshortening of the flange takes place along the outer edge and no foreshortening takes place along theedge crease so that the action of the rolls in thus foreshortening ,the flange causes the backpart blank to assume a curved shape. By confining the corrugations to the heel-end portion of the blank or that portion between the lines a: and y in Fig. 6 the blank is caused to assume somewhat the shape of a finished backpart.

In order to operate the rolls l6 and I8 the roll I6 is mounted on a shaft 48 (Fig. 2) journaled in an arm 58 pivoted at 52 about a horizontal axis in the head I I of the housing ID. The shaft 48 carries a pinion 54 which meshes with a pinion 56 carried by a shaft 58 on the outerend of which is mounted the corrugating roll IS. The shaft 58 carries a sprocket 68 connected by a. sprocket chain 62 to a sprocket 64 on the counter-shaft 36. Thus it will be seen that the shaft 58 carrying the lower corrugating roll I8 is continuously driven during the operation of the machine and through the pinions 56, 54 the shaft 48 carrying the roll [6 is continuously driven therewith. The axis about which the arm 58 carrying the upper roll I8 pivots, coincides with the pitch circles of the pinions 54 and 56 so that the arm 50 may be moved about its pivot to carry the roll l6 toward or away from the roll l8 thereby to render the rolls ineffective while maintaining the pinions in constant engagement. sufficient clearance is provided between the teeth of the pinions to permit this movement of the, arm 58 and the shaft 48.

For moving the arm 50 carrying the upper corrugating roll l8 about its pivotal axis 52 the arm carries a rearward extension 68 which slidably receives the threaded upper end of a vertically extending rod 10, the lower end of which is pivoted at 12 to a lever 14, fulcrumed. Qll a SUQW I6 threaded into a wall of the housing III. A spring 18 surrounds the rod 10 and acts between a collar 88 secured to the lower portion of the rod and the under surface of the rearward extension 68 so that upon clockwise movement of the lever 14, as viewed in Fig. 2, the arm 50 is moved in a clockwise direction through the compressive action of the spring 18, thereby to move the upper roll I 6 toward the lower roll l8 into the position shown in Fig. 2. The upper end of the rod 10 carries a pair of nuts 82 engageable with the upper surface of the extension 68 when the lever 14 is moved in its counterclockwise direction thereby to move the arm 50 to carry the roll l6 away from the roll I8. The lever 14 is normally urged in a counterclockwise direction, to maintain the corrugating rolls separated, by a spring 84 connected to the rearward portion of the lever 14 and to a pin 86 secured to the side wall of the housing Ill. The forward end of the lever I4 is connected by a treadle rod 88 to a suitable treadle, not shown, whereupon the rod may be pulled down to move the lever 14 against the action of the spring 84 thereby to move the upper corrugating roll l6 toward the lower roll l8.

In the normal operation of the machine the flange-forming roll l2 and the corrugating rolls l5 and I8 are continuously driven from the counter-shaft 36 and the upper corrugating roll is normally held in an elevated position, spaced sufliciently from the lower roll l8 so that these rolls will have no effect on the flange of a backpart blank passing therebetween. One end of a blank is introduced between the rolls l2 and I4 whereupon the blank is fed therebetween and the flange F is formed along the length thereof, as shown in Fig. 5. With the corrugating rolls l6 and I 8 sufliciently separated, the flange thus formed passes between these rolls without being acted upon thereby. At the proper time, however, during the passage of the blank between the corrugating rolls the operator depresses the treadle, thereby moving the upper roll J6 toward the roll l8, whereupon corrugations are progressively formed in a portion of the blank, such as from the line a: in Fig. 6 to the line 1/.

After the corrugations have been formed around to the liner the operator removes his foot from the treadle whereupon the corrugating rolls are separated and the remaining portion of the flange is not corrugated. Inasmuch as thedepth of corrugations is greatest along the edge of the flange and decreases inwardly toward the edge crease C, the corrugations terminating just short of the edge crease, the foreshortening effect on the flange is greatest along the outer edge and decreases inwardly to the edge crease, whereby the effect of the corrugating rolls is to form the blank into a curved shape. By confining the corrugations to that portion of the flange around the heel-end portion of the blank, as defined by the lines :0, 1/, only that portion of the blank is curved and the wing portions extending forwardly from these lines will be substantially flat so that the blank is formed into a shape approximating that of a completed backpart, and the amount of final molding of the backpart neces-' sary to form the backpart into finished shape is reduced to a minimum.

It will thus be seen that the machine in a single operation acts on a flat backpart blank to turn a flange and form corrugations in the flange, the corrugations being of such nature that the backpart is curved into a shape approximating that of a completed backpart. By thus corrugating the margin following the flanging operation, the corrugations are readily confined to the flange and. objectionable wrinkles Visible in the finished shoe are avoided.

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 operating on flat backpart blanks, means for flanging the lower marginal portion of the blank, means for progressively corrugating the flange, and operator-controlled means for rendering the corrugating means ineffective at will during the operation of the flanging means.

2. In a machine for operating on flat backpart blanks, means for flanging the lower marginal portion of a blank, and means for imparting to the flange thus formed corrugations the depths of which decrease inwardly from the outer edge thereof.

3. In a machine for operating on flat backpart blanks, a pair of cooperating rolls arranged to act on opposite sides of a blank to flange the lower marginal portion thereof, and a pair of toothed rolls arranged on axes inclined to each other to act on the flanged portion of the blank to form corrugations therein which decrease inwardly from the edge thereof.

4. In a machine for operating on flat backpart blanks, a pair of cooperating rolls arranged to act on opposite sides of a blank to flange the lower marginal portion thereof, a pair of toothed rolls arranged to act on the flanged portion of the blank to form corrugations therein, and operatorcontrolled means for separating said toothed rolls to render them ineffective.

5. Mechanism for corrugating the flange of a flat backpart blank comprising a pair of intermeshing toothed rolls between which the flange of the blank may be passed, shafts supporting said rolls, means for driving one of said shafts,

intermeshing pinions carried by said shafts, and means for pivotally mounting one of said shafts to permit the roll carried thereby to be separated from the other roll, the axis of the pivotal mounting passing through the pitch circles of the pinions.

6. Mechanism for corrugating the flange of a flat backpart blank comprising a pair of intermeshing toothed rolls between which the flange of the blank may be passed, means for mounting said rolls on aXes inclined with respect to each other, means for separating said rolls to render them ineffective, and means for continuously rotating said rolls at all times including periods of separation.

7. Mechanism for corrugating the flange of a flat backpart blank comprising a pair of intermeshing toothed rolls between which the flange of the blank may be passed, shafts supporting said rolls on axes inclined with respect to each other, means for moving one of said shafts toward and away from the other, and means for continuously driving both of said shafts at all times regardless of their relative positions.

8. Mechanism for corrugating the flange of a flat backpart blank which comprises a pair of rolls having intermeshing teeth of uniform depth, and means mounting said rolls for rotation about axes inclined relatively to each other whereby the corrugations impressed by the rolls on a work piece are of variable depth.

9. Mechanism for corrugating the flange of a flat backpart blank which comprises a pair of rolls having intermeshing teeth of uniform depth, means mounting said rolls for rotation about axes inclined relatively to each other whereby the corrugations impressed by the rolls on a work piece are of variable depth, and means for moving one of said rolls toward and away from the other.

EMIERY R. DAVIS.

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