US2053303A

US2053303A - Machine for operating upon sheet material

Info

Publication number: US2053303A
Application number: US717053A
Authority: US
Inventors: Robert N Sandberg
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1934-03-23
Filing date: 1934-03-23
Publication date: 1936-09-08
Anticipated expiration: 1953-09-08

Description

7 Sept. 1936- R. N. SANDBERG 1 2,053,303

MACHINE FOR OPERATING UPON SHEET MATERIAL Filed-March 25, 1954 2 Sheets-Sheet l Sept. 8, 1936. R SANDBERG 2,053,303

MACHINE FOR OPERATING UPON SHEET MATERIAL Filed March 25, 1954 I 2 Sheets-Sheet 2 Patented Sept. 8, 1936 PATENT OFFICE MACHINE FOR OPERATING UPON SHEET MATERIAL Robert N. Sandberg, Beverly,

United Shoe Machinery Corporation,

Mass., assignor to Paterson, N. J., a corporation of New Jersey Application March 23,

9 Claims.

This invention relates to machines for operating upon sheet material and is herein illustrated as embodied in a clicking machine.

Clicking machines as heretofore constructed commonly comprise a bed, a cutting block supported upon the bed, and a presser member arranged for reciprocation relatively to the bed, thereby forcing a freely movable die through sheet material, such as leather, positioned upon the cutting block. Cutting blocks used in such machines are subject to wear and frequently must be removed from the machine for resurfacing operations or for replacement. Consequently it is customary to secure a cutting block in position upon the bed of the machine by devices such as clamping bolts which can be released when it is necessary to remove the block.

It is'an object of the present invention to provide, in a machine of the type refered to, a block-securing device of novel construction which will be especially adapted to facilitate the assembly or disassembly of a cutting block and the bed of the machine.

To this end and as illustrated, the invention provides a bed, a cutting block supported upon the bed and a clamping device comprising a toggle mechanism for securing the block to the bed. By the use of the toggle mechanism in the construction set forth, it is possible quickly to secure theblock to the bed or to release it from the bed thus to save the time which an operator would otherwise have to spend in loosening or tightening the attaching bolts commonly used heretofore.

Other features of the invention will be apparent from the following detailed description when taken in connection with the accompanying drawings and will be pointed out in the claims.

. In the drawings,

Fig. 1 is a side view partly in section of a portion of a clicking machine disclosing one form of block-securing device;

.Fig. 2 isa plan view showing the cutting block in position upon the bed of the machine;

.Fig. 3 is a detailed view partly in section of the toggle mechanism for operating the clamping device;

Fig. 4 is a side elevation of a part of a clicking .machine illustrating a modified form of block-securing device; and

.Fig. 5 is a plan view of a portion of the machine equipped as in Fig. 4 and illustrating also a work table mounted adjacent to the cutting blockof the machine.

The clicking machine illustrated in Figs. 1

1934, Serial No. 717,053

and 2 comprises a frame Ill, carrying a flat bed l2 upon which is positioned a cutting block I4, and a presser arm [6 which is arranged for reciprocation relatively to the bed by means of mechanism not shown.

The cutting block i4 is square in cross section as shown in Fig. 2 and is particularly adapted, as is the entire machine shown, for use in operating upon small work such as appliques -or other small blanks which go into the making of the uppers of shoes. Preferably, the cutting block I4 is of wood and is composed of separate blocks or sections I! glued together and secured in position against forces applied to the upper surface of the block by clamping irons or bolts i8 which extend along the sides of the block and are secured together at their ends by nuts 20. Additional reinforcement of the block is obtained by

rods

22 and 24 which extend through the block and connect the irons l8 at opposite sides thereof. The rod 22 is positioned in a groove 26 extending along the lower surface of the block, the rod having reduced ends 28 which pass through opposite clamping irons i8 and are secured in position by nuts 30. The reinforcing rod 24 extends at right angles to the rod 22 and passing through two of the clamping irons l8 and through a slot 32 in the rod 22. This arrangement of clamping irons l8 and reinforcing

rods

22 and 24 produces a rigid block structure which can effectively withstand blows applied to the upper surface of the cutting block-I4.

In order to secure the cutting block to the bed l2 there is provided quickly detachable clamping means which will now be described. Secured to the central portion of the rod 22 is a spindle or shank 34 which extends downwardly through a clearance opening 36 and a bore 38 in a boss 45 on the under side of the bed l2. The shank 34 is arranged to be forced in a downward direction by means of a toggle lever 42 having ears 43 mounted upon a pin 44 carried by the boss 40 and is operatively connectedto a sleeve 46 slidably mounted upon the shank 34 by toggle links 48 mounted upon pins 58, carried by the lever, and connected to the sleeve 46 by pins 52. The lower end of the shank 34 is screw-threaded and carries a nut 54, held in adjusted position by a nut 55, which serves to limit downward movement of the sleeve 52 upon the shank, the sleeve being normally forced upwardly by springs 56 extending between the pins 44 and 52. Upon rotation of the lever 42 in a counterclockwise direction (Fig. 1) the toggle links 48 are brought into a position with their axes in line with the pins 44 and 50, thus forcing the sleeve 46 downwardly causing it to engage the nut 54 thereby to force the shank 34 downwardly with sufficient pressure to clamp the cutting block I4 to the bed I2. The clamping device can readily be released by moving the lever in a clockwise direction thereby to break the toggle.

One advantage of the construction just described is that the positioning of the cutting block upon its supporting bed is facilitated as in cases where it is desired to locate a new block surface at the point where the operator does most of the work, that is, the front of the machine. This can be done readily merely by releasing the toggle, rotating the block on the bed about the shank 34 through 90 and then operating the toggle lever 42 again to clamp the block to the bed. By thus shifting the position of the block upon the bed at frequent intervals the wear upon the block is evenly distributed thus rendering frequent resurfacing unnecessary.

In Figs. 4 and 5 I have shown in a modified form a block-securing device in which there are several toggle-operated clamps positioned along the. sides of a cutting block. In this instance, the machine comprises a frame 60 having a bed 62 supporting a cutting block 64 and having a presser member 66 arranged for reciprocation relatively to the bed by mechanism not shown;

The block is arranged to' be secured to the cutting bed by a plurality of clamping bolts 68, each of which has a hooked portion '10 adapted to enter a slot I2 in one of the block clamping irons 14. Each of the clampingbolts is carried by a toggle block 16 mounted upon a pin 18 carried by a bifurcated toggle lever 80 which in turn is carried by a pin 82 mounted in ears 84 on the Within the toggle block 16.

bed of the machine. 7 is positioned a. nut 86 adapted to receive the screw-threaded end 88 of the clamping bolt 68, the nut .86 being held against rotation in the block bymeans of a pin 90 which is adapted to engagea flat side 92. of the nut. The nut 86 is providedwith an upwardly extending reduced portion or sleeve 94 which carries a stiff spring 96 the upper end of which bears against a shoulder 98 on the toggle block 16. This spring constitutes a yieldable connection between the bolt 68 and the toggle block 16 by which pressure can. be applied to the bolt;

In the use of the clamping bolts 68 a bolt is swung about the

pivot pins

18 and 82 until the hooked portion 10 of the bolt engages the bottom of a slot 172 and the toggle lever 80 is then forced down until the pivot pin 18 is positioned inwardly of the pin 82. This results in forcing the toggle block 16 downwardly causing the shoulder 98 to compress. the spring 96 and apply pressure to the nut 85 and bolt 68' to clamp the cutting block 64' to the bed. The pressure which a bolt exerts upon the cutting block can be adjusted merely by turning the bolt in its sleeve 94, thereby to lengthen or shorten the distance between the hooked portion 10 of the bolt and the pivot pin 18. V V

In order to provide for the support of dies and tools in proximity to the cutting block where they are'used the machine is equipped with work tables I00 positioned upon opposite sides of the cutting block 64., Each of the tables comprises a board I02 having on the under side thereof a metal bracket I 04 which is supported by two rods I06 and I08 slidably secured to the frame end, the table I 00 is pivotally mounted on the rod I06 which extends through ears I I2 on the bracket I04, there being a spring I I4 positioned between one of the ears and. a pin I I6 extending through the rod whereby the table is forced toward the side of the cutting block to maintain it in juxtaposition thereto. The rearward end of the table normally rests on the rod I08 without being secured thereto. The tablel02 is cut away along one side thereof at H8 and at I20 toprovide clearance for the clamping bolts 68 and for portions of the frame of the machine. When. it is desired to operate the clamping bolts along the sides of the block, such bolts normally being partially covered by the tables, the tables can readily be swung about the rods I06 so that they extend downwardly as shown in the righthand portionof Fig. 5, thus to provide access to the clamping bolts. In swinging the tables to such position or in placing them back in their normal position they may be pushed outwardly of the cutting block against the pressure ofrthe springs H4 in order to clear various of the parts of the machine during their movements into or out'of normal position Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a clicking machine, a bed, a cutting block supported upon the bed, a clamping member loosely carried by the bed and adapted to engage the block, and a toggle member for exerting pressure upon the clamping member thereby to secure the block to the bed.

2. In a clicking machine, a bed, a cutting block positioned upon the bed, a clamping member for engaging the block, and a toggle member for operatingthe clamping member to secure the block to the bed.

3. In a clicking machine, abed, a cutting block.

the block can be readily removed fromthe bed..

4.. In a clicking machine, a bed, a cutting block supported upon the bed, a member secured to the cutting block and having 2. depending portion extending through the bed, a sleeve loosely carried by the depending portion,.and a lever carried by the bed for forcing the sleeve in a direction to clamp the block to the bed. V V 5. In a clicking machine, a bed, a cutting block position-ed upon the bed, a member secured to the cutting block and having .a depending portion extending through the bed, and lever-operated means for engaging the depending portion to clamp the block to the bed.

6. In a clicking. machine, a bed, a cutting block positioned upon the bed, means for clamping the block to the bed comprising a member engaging the cutting block and extending through the bed, a lever pivoted upon the bed and having means for engaging the member to force it in a direction. to clamp the block to the bed. I

'7'. A block-securing device comprising a bolt formed to engage a portion of a cutting block, a sleeve screw-threaded on the bolt, a toggle block slidably mounted upon the bolt and surroundingthesleeve, a spring positioned upon the sleeve and adapted to be engaged by a-portion of the block, and a toggle lever for forcing the block in toggle member for engaging the bolt to move it in of rods projecting laterally from the frame, a. a direction to clamp the block to the bed. bracket on the table pivotally mounted upon one 9. In a clicking machine, a frame, a cutting of the rods, and resilient means normally operablock supported by the frame, a work table positive to force the table laterally toward the cut- 5 tioned adjacent to the cutting block and means ting block.

for supporting the table comprising a plurality ROBERT N. SANDBERG.