US 2771534 A
Description (OCR text may contain errors)
ROTATING NYLON BELT CUTTER Filed July 19, 1955 INVENTOR. ja l y A. oyn al n/ United States Patent 2,771,534 ROTATING NYLON BELT CUTTER Joseph L. Schwahn, Philadelphia, Pa. Application July 19, 1955, Serial No. 523,131
1 Claim. (Cl. 219-29) (Granted under Title 35, U. S. Code (1952), sec. 266) The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
This invention relates to improvements in cutting bolts of cloth to specific lengths. More specifically it relates to an automatic machine which cuts synthetic materials, such as nylon parachute belting, to a specified length automatically.
An object of this invention therefore is a machine which automatically cuts webbing material to certain prescribed sizes.
A further object of this invention is an automatic device which fuses the ends of the material automatically cut on the machine.
Another object of this invention is a cutting device which is simple to maintain and which does not require sharpening as the result of continued use.
Still other objects, advantages and improvements will be apparent from a consideration of the following description, taken in conjunction with the accompanying drawings, in which:
Figure 1 is an end view of the cutting device, and
Figure 2 is a cross-sectional view along section 22 of Figure 1.
In nylon parachute making, the webbing to date has been cut and fused manually. This invention intends to eliminate the manual process and substitute therefor a machine which automatically performs this operation and also automatically cuts the webbing to the prescribed length.
In the drawings, a pair of rollers 1, 2 are mounted on shafts 7, 8, which shafts are geared through gearing 22, 23 to synchronize the rotation of the two drums and shafts. Motor 19 drives one of the shafts through conventional gearing 17, 18.
Indented on drum 1 are two wells 3, 4 (roller 2 has a pair of similar wells 20, 6), wells 3, 4 containing a pair fo posts such as 9, 10 (Fig. 2). Strung between the posts is a heating wire 21. Copper plates 11, 12 are fastened, one on each end of the drum 1, and form end plate members for the drum.
Needle points 13, 14 are mounted on drum 2, which points serve to pull the webbing or other synthetic fabric 15, through the two rolls.
The design of the rolls is such that the outer periphery or portions thereof conform to the length of fabric to be cut. In the particular case at hand, two cutting wires on drum 1 are shown, consequently one-half of the outer periphery of the drum is the desired length of cut of fabric. Obviously more or less than two wires can be used depending upon the initial diameter of the drum and the length of cut fabric desired.
The operation of the device is as follows: The drums are rotated at the desired rate of speed by the motor 19 and the reduction gearing while gears 22, 23 insure that synchronous rotary motion of the drums is obtained. The synthtic material webbing is fed between the rollers with the aid of pins 13, 14 which grab the fabric on rotation of drum 2.
One of the wires, for example, wire 21 engages the material adjacent the well 20 on drum 2. The wire 21 is heated by a curent fed from the end plates and through the posts 9 and 10. The heat from the wire together with the thinness of the wire cuts the webbing upon further rotation of the drums as the wire further enters its mating well 20. The length of fabric cut off is determined of course by the diameter of the drums.
The action of the heated wire not only severs the length of piece required but also fuses the end of the material so that the piece cut is ready for further operations.
Although the electrical circuit is shown in simple form, it is understood that conventional transformers, brushes, etc. are used to conduct the proper degree of power to the end plates of drum 1.
The electrical connection from the wire to the plates may be also of various forms. The post itself may act as an electrical conductor or may be merely a fastening means through which the heating wire is passed before attachment of the wire to the copper plates.
Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.
What is claimed is:
A cutting device for cutting a synthetic belting material in specified lengths comprising a pair of closely spaced drums mounted on separate shafts, means to rotate one of said drums, synchronizing meshing gear means mounted on said shafts to thereby rotate the drums at the same speed, a plurality of longitudinal wells set into the periphery of one of the drums, a similar plurality of mating longitudinal wells set into the periphery of the other of said drums, a heating wire mounted in each of the wells of the one of said drums, at set of copper end plates mounted on the ends of the one of said drums, said plates connected to an electrical source and to the terminals of said wires, a plurality of pins mounted on the periphery of the other of said drums, rotation of said drums causing said belting to pass between the drums with the pins engaging said belting and aiding the drums to pass said belting between the drums and said wire heated by the electrical current passed therethrough cutting and fusing the belting on its travel through the drums.
References Cited in the file of this patent UNITED STATES PATENTS 751,527 Marr Feb. 9, 1904 2,202,110 Maurer May 28, 1940 2,232,640 Schwartzman Feb. 18, 1941 2,242,645 Frost May 20, 1941 2,589,777 Collins Mar. 18, 1952 2,621,705 Nye et al Dec. 16, 1952 2,625,201 Smith Jan. 13, 1953 2,627,893 Williams Feb. 10, 1953 Patented Nov. 20, 1956'-