US2263700A - Edge cutter for shoes - Google Patents

Description

Nov. 25, 1941. J. HOZA EDGE CUTTER FOR'SHOES Filed 'Ma 13,. 1940 Edd Patented Nov. 25, 1941 OFFICE 2,263,700 1 EDGE CUTTER FOR SHOES John Hoza, Bea s, Md.

Application May 13, 1940, Serial sagas In Czechoslovakia July 30, 1938 a 13 Claims.

This invention relates to a machine comprising mechanism for cutting off the edges of shoes in the manufacture thereof, especially overshoes, galoshes and rubber shoes of all sizes.

Heretofore it has been customary to cut off the edges of shoes such as aforesaid by hand, by means of scissors. Such handwork is subject to the usual disadvantage that it is slow. Moreover, it is performed without exactitude, and the bevelling-off is irregular, with the result that shoes with hand-cut edges are often unsightly,

An object of this invention is to provide a machine having mechanism for cutting off the edges of shoes and serving to improve the cutting-off operation both quantitatively and qualitatively.

Another object .is to guide and feed the Work in an efficient manner.

Another object is to provide mechanism comprising control means forvarying the feed of the shoe to an edge-cutting knife during the operation of said mechanism with constant cutting speed so that the curved form of the edge can be varied.

Another object is to provide mechanism comprising meansyfor adjusting the angular relationship between the knife and the work so that the bevel of the edge can be regulated and will be cut with overall uniformity.

Another object of the invention is to provide edge-cutting means so operable, adjustable and controllable that a wide variety of shoescan be turned out.

said forked arm bearing against the disc 5. The lever 4, at its opposite end, is connected by a rod (not shown) to a control pedal. A control pull-rod I is mounted for sliding axial movement in the shaft 6; and a cross-pin 8 extendingdiametrally through the ferrule I passes through a hole in the rod I and is guided in longitudinal slots in the shaft 6. The rod I is urged and normally maintained towards the left, as viewed in Fig. 1, by a spring 2 arranged in the shaft 6 andjpressing against the right-hand end of the rod I.

There is formed in the surface of the pull-rod I, near its left-hand end, a recess 9 which has an inclined base and which is engaged by a regulating screw I0 extending through the shaft 6 and retained in place by a safety screw I I. Both of these screws are threaded in an eccentric 3 (Figs. 1 and 2). Screws I3 and I4 connect the eccentric'3 to a carrier flange I2 which is secured fast to the shaft'fi. The, screw 14 passes fore is pivotable, to vary its eccentricity to a l limited extent, about the'screw I3. "I'heshaft 6 Other objects of the invention will appear from the following specification and claims.

:The invention will now be described by way of example with reference to the accompanying drawing in which:

Fig. 1 is a sectional side elevation of the edgecutting mechanism.

Fig. 2 is an elevation, partly in section, looking towards the left hand end of the assembly denoted generally by A in Fig. 1.

The edge-cutting mechanism comprises, on the one hand, an assembly forperforming the feed motion applied to the shoe and controlling the length of said motion and,-on the other hand, an assembly for operating and adjusting the inclination of the knife. and their functions will now be described.

The machine in which the mechanism shown is incorporated includes a main driving shaft 6 journalled for'rotation in bearings (not shown) in the frame of the machine, said shaft being motor driven. A disc 5, a flanged ferrule l and an intermediate thrust washer 6 made of fibre, areall arranged against one another and embrace the shaft 6. The disc 5 is restrained against rotation with the shaft by a pin 5 which engages a recess in the forked arm of a lever 4,

These two assemblies a of the rod I.

passes right throughboth the flange I2 and the eccentric 3. A small pad or brake block I5, which is seated in the eccentric 3, is pressed by a spring l'l. against the shaft 6. The spring IT bears upon a retaining screw [8 in the eccentric 3. The function of the spring I! is to maintain the screw I 0 against the inclined bas of the recess 9 and thus to urge the eccentric 3 to adopt its most central, or least eccentric setting, the actual setting being determined by the axial position A strap or pulley I9 is journalled on the eccentric 3 and extends laterally therefrom. A post 20 is slidabl through the strap l9 and is secured fast to a pivotally mounted body 2l which carries the limb 22 at the end of When the shaft 6 and eccentric 3 thereon are t rotated, the strap I9 and post 20 are caused to rock,the post sliding in relation to the strap during this rocking motion. The result of this action is that a to-and-fro or reciprocatory lateral motion is imparted to the foot 23, which motion combines with the aforesaid vertical reciprocating motion to produce a stepwise feed motion impartedby the foot 23. The amplitude of the 'reciprocatory' lateral motion and therefore the magnitude of the stepwise feed motion are proportional to the stroke of the eccentric 3.

' In use of the mechanism described, a shoe 3 is placed upon a lower .arm 39 of the frame and the machine is'put in operation. The machine is normally set to give the shoe the customary,

The aforesaid pedal is not depressed in the normal setting of the machine, and therefore the spring 2 maintains the pull-rod I pressed in its endmost position towards the left, in which position the cocentric 3 is maintained in its most central setting by the spring l1, the screw then being at the deepest end of recess 9. That is, the ecfoot 23 also is sh'ortest.

As soon as the edge is to be out to a slightly incurving form, the feed is increased. This is effected by depressing the pedal attached to the lever 4. Thus, the lever is turned so that its forked end presses the assembly of shaft-embracing parts 5, 6 and 1 towards the right, and the cross-pin 8 transmits this motion to me rod I, so that the inclined base of recess 9 acts like a cam to displace the screw II] radially outwards against the pressure of spring I1. Accordingly, the eccentric 3 is pivoted into a setting of greater eccentricity and proportionately increases the length of feed applied by the foot 23 to the shoe edge being out.

By depressing further, or by relieving more or less the pressure on, the pedal connected to lever 4, the control rod l is moved further to the left, or returned more or less to the right, so that the eccentricity of eccentric 3 is increased or decreased and the length or rate of feed is proportionately increased or decreased.

With reference now to the knife operating and adjusting assembly, as shown in Fig. 1, screw gears 24, 25 transmit drive from the main shaft to a crankshaft 26, on one end of which a crank 21 is provided. A pitman 28 driven by the crank 21 has an extension 29 which is connected to one end of a bellcrank lever 30. The length of the entire pitman can be adjusted at will by temporarily slackening the connection between the parts 28, 29. The fulcrum pin 3| of the lever 30 is secured to a lug projecting from a guide-block 32 which is angularly adjustable around a segment 33 secured by screws 34, 35 on the frame of the machine. The other end of lever 30 slidably enters a hole penetrating a cylindrical journal pin turnably mounted in the holder 31 of the knife 33. The holder 31 is guided to reciprocate at an inclination in the angularly adjustable guide-block 32. The extent of angular adjustment of the block 32, and therefore of the inclination of the knife 38, is about 10 to 30. The setting of the guide-block 32 on the segment 33 is selected, and can be adjusted by means of the holder 31, before the commencement of the operation of the machine, or before work starts upon a different form of shoe requiring a different inclination or bevel of the edge to be cut. The length of the pitman 28, 29 is or may be simultaneously adjusted.

The frame of the machine terminates below in the work-supporting arm 39, To this arm a counter-knife is fastened. The adjustable knife 38is reciprocated by the crank and pitman acting through the lever 30 and holder 31 and cooperates with' the counter-knife to shear the material of the upper at the edge thereof.

The operation and regulation of the feed of the shoe is in no respect dependent upon the actuation of the knife. Accordingly, the feed can be varied atwill while the cutting speed remains constant. Thus, the form of the shoe-edge curvature is variable under the operator's control of the pedal-operated lever 4 and parts operated thereby.

The arrangement of the lower work-supporting arm 39 is very advantageous, as it renders possible the cutting-out of edges of wide variety.

Modifications may be made without departing from the scope of the invention hereinafter claimed. For example, instead of varying the inclination of the knife, the arrangement may be such that it is the inclination of the shoe edge which is varied.

I claim:

1. Edge-cutting mechanism for shoes, said mechanism comprising a support for a shoe, rotary means, a knife adapted to work in relation to said support, a counter-knife on said support adapted to co-operate with said knife, feed means including a reciprocable shoe-engaging member movable in relation to said support to feed the shoe edge to said knife and counter knife, a transmission from said rotary means to said member for imparting reciprocating feed motion thereto, control means applied to said rotary means for regulating the amplitude of reciprocation of said motion to vary the extent of feeding thereby, means guiding said knife to cut at an inclination to said shoe edge, and means operated by said rotary means actuating said knife.

2. Edge-cutting mechanism for shoes, said mechanism comprising a support for a shoe, rotary means, a knife adapted to work in relation to said support, a counter-knife on said support adapted to co-operate with said knife, feed means including a reciprocable shoe-engaging member movable in relation to said support to feed the shoe edge to said knife and counterknife, control means applied to said rotary means for regulating the amplitude of reciprocation of said member to vary the rate of feeding thereby, and means operated by said rotary means actuating said knife to out said edge at regular overall speed.

3. Edge-cutting mechanism for shoes, said mechanism comprising a rotary drive shaft, a knife, a support for a shoe edge, means operated by said shaft to actuate said knife at an inclination to said support, a feed element for feeding the shoe edge in relation to said knife, means for operating said element comprising an eccentric on said shaft and an operative connection between said eccentric and element, and control 'means for varying the extent of feeding by said feed element, said control means comprising a rod mounted for axial displacement in said shaft, a manually operable lever for controlling the axial position of said rod, said lever having a forked end, motion-transmitting means on said shaft and connecting said forked end to said rod and a connection between said rod and said eccentric, said connection serving to displace said eccentric to vary its eccentricity on axial displacement of said rod.

4. Edge-cutting mechanism according to claim 3, in which said forked end is formed with a recess and in which said motion-transmitting means comprise a ring abutting said forked end, an annular member connected to said rod and axially displaceable on said shaft, a fibre washer sandwiched between said ring and member, and a projection on said ring engaging said recess to hold said ring against rotation with said shaft.

5. Edge-cutting mechanism according to claim 3, in which said motion-transmitting means'inelude a flanged member on said shaft, a pin connecting said member to said rod and a slot in said shaft through which said pin passes to permit axial displacement of said member on said shaft.

6. Edge-cutting mechanism for shoes, said mechanism comprising a rotary drive shaft, a knife, a support for a shoe edge, means operated by said shaft to actuate said knife, feed means for feeding the shoe edge in relation to said knife, said feed means comprising a shoe-engaging feed element mounted for movement toandfro, an eccentric on said shaft and an operative connection between said eccentric and said feed element, and control means for varying the extent of feeding by said element, said control means including an axially displaceable member in said shaft, an inclined device in said member and a connection in said eccentric between it and said member for displacing said eccentric to vary its eccentricity.

'7. Edge-cutting mechanism according to claim 6 in which manually operable means associated with said shaft are operatively connected to said axially displaceable member for its displacement in one direction, and in which a spring mounted in said shaft urges said member in the opposite direction.

8. Edge-cutting mechanism for shoes, said mechanism comprising a knife, a support for a shoe edge, feed means for feeding the shoe edge to said knife, a holder for'said knife, a guide in which said holder and knife are reciprocable in a direction of cut inclined to said support, means for reciprocating said holder and knife to out said shoe edge at said inclination, and a segment on which said guide is mounted and is adjustable to vary the inclination of said direction of cut.

9. Edge-cutting mechanism for shoes, said mechanism comprising a rotary drive shaft, a knife, a support for a shoe edge, feed means operated by said shaft for feeding the shoe edge to said knife, a holder for said knife, a guide in which said holder is reciprocable at an inclination to said support, knife-reciprocating means operated by said shaft, said knife-reciprocating means including a lever fulorumed to pivot on said guide and operatively connected to said shaft and a journal turnably mounted in said holder and slidably engaged by said lever, and means for adjusting the angular relationship of said guide to said support in order to vary said inclination.

10. Edge-cutting mechanism for shoes, said mechanism comprising a main rotary, shaft, a support for a shoe whose edge is to be out, a knife, means guiding said knife for movement at an inclination to said support, a counter-knife thereon co-operating with said knife, knife-driving means for reciprocating said knife in said knife-guiding means, said knife-driving means comprising a crank rotated by said shaft, a pitman of adjustable length operated by said crank,

and a lever inter-connecting said pitman and knife, said lever being fulcrumed in said knifeguiding means, a segmental element on which said knife-guiding means is mounted and is angularly adjustable to vary said inclination, a shoe-engaging feed-foot mounted in relation to said support for motion including a to-and-fro feed-motion whereby said shoe edge is fed stepwise to said knife and counter-knife, operating means for imparting said feed-motion to said feed-foot, said operating mechanism comprising an eccentric on and rotating with said shaft, an element embracing and actuated by said eccentric and an operative connection between said element and said feed-foot, and mean for adjusting the extent of said stepwise feed-motion comprising an axially displaceable rod in said shaft, a manually turnable lever for controlling axial displacement of said rod in both directions, a cam device on said rod, a carrier on said shaft to which said eccentric is pivotally attached so that its eccentricity can be varied by pivotal adjustment of the eccentric, and a connection between said cam device and said eccentric for pivotally adjusting it under the control of said manually turnable lever and said rod.

11. Edge-cutting mechanism for shoes, said mechanism comprising a rotary shaft, a support for a shoe Whose edge is to be cut, a knife, means guiding said knife for movement at an inclination to said support, a counter-knife thereon cooperating with said knife, knife-driving means operated by said shaft to reciprocate said knife in said knife-guiding means, an element on which said knife-guiding means is mounted and is angularly adjustable to vary said inclination, a shoe-engaging feed-foot mounted in relation to said support for motion including a to-and-fro feed-motion whereby said shoe edge is fed stepwise to said knife and counter-knife, operating means driven by said shaft to impart said toand-fro feed-motion to said feed-foot, and means applied to the last-stated operating means for adjusting the extent of the to-and-fro motion of said feed-foot.

l2. Edge-cutting mechanism for shoes, said mechanism comprising a rotary shaft, a support for a shoe whose edge is to be cut, cutting means operated by said shaft and mounted adjacent said support, a shoe-engaging feed-foot mounted in relation to said support for motion including a to-and-fro feed-motion whereby said shoe edge is fed stepwise to said cutting means, operating means for imparting said feed-motion to said feed-foot, said operating mechanism comprising an eccentric on and rotating with said shaft, an element embracing and actuated by said eccentric and an operative connection between said element and said feed-foot, and means for adjusting the extent of said stepwise feed-motion comprising an axially displaceable rod in said shaft, a manually turnable lever for controlling axial displacement of said rod in both directions, a cam device on said rod, a carrier on said shaft to which said eccentric is pivotally attached so that its eccentricity can be varied by pivotal adjustment of the eccentric, and a connection between said cam device and said eccentric for pivotally adjusting it under the control of said manually turnable lever and said rod.

13. Edge-cutting mechanism for shoes, said mechanism comprising a rotary shaft, a support for a shoe whose edge is to be cut, a knife, means guiding said knife in relation to said support, a counter-knife thereon co-operating with said knife, knife-driving means for reciprocating said knife in said knife-guiding means, said knifedriving means comprising a crank rotated by said shaft, a pitman of adjustable length operated by said crank, and a lever inter-connecting said pitman and knife, said lever being fulcrumed in said knife-guiding means, a shoe-engaging feed-foot mounted in relation to said support for motion including a to-and-fro feed-moe tion whereby said shoe edge is fed stepwise to said knife and counter-knife, and operating means driven by said shaft to impart said feedmotion to said feed-foot.

JOHN HOZA,

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