Claims
- 1. In combination:
- a. an endless web of synthetic fabric,
- b. a severing apparatus comprising:
- 1. a bed having guide means for guiding the web on a path through the apparatus and having a flat metal cutting block disposed horizontally in the bed transverse to the path, the block being directly underlaid by a layer of resilient material,
- 2. support means secured to the bed and extending upward on opposite sides of the path,
- 3. vertically reciprocating drive means mounted on the support means above the block and comprising a vertically disposed pneumatic cylinder having a piston operatively disposed therein, a connecting rod connected thereto and extending through a sealed opening in the lower end of the cylinder, a horizontally disposed yoke secured at its center to the lower end of the rod.
- 2. The combination as claimed in claim 1 wherein the bed has compressed air passages therein having angled outlets in the path to help move the web and finite lengths along the path.
- 3. The combination as claimed in claim 1 wherein a support frame supports the bed in an adjustably fixed manner lengthwise of the path.
- 4. The combination as claimed in claim 3 wherein the bed is laterally adjustable with respect to the frame.
- 4. vertically disposed support pins secured to and extending down from the opposite ends of the yoke, and
- 5. a heated knife assembly comprising a thin vertically disposed body having securing means at the opposite ends of the upper portion thereof secured to the pins respectively, a heating element disposed in the assembly, the lower end of the assembly comprising a heated knife being pointed in a cutting line parallel to the top surface of the cutting block, the converging sides of the heated knife at the cutting line being symmetrical about an imaginary vertical line through the cutting line and disposed at an obtuse angle with respect to each other so that the sides are at angles to the cutting block of less than 45.degree. respectively, the heating element being parallel to the cutting line and adapted to heat the knife to a temperature approaching 950.degree. F.
- whereby when the drive means is activated, it will drive down the knife assembly so that the cutting line forcefully impacts the synthetic fabric and severs it and binds together the threads in the synthetic fabric adjacent the cut and creates non-fraying edges, the edges having been subject to the broad impact of the sides of the heated knife at an angle of less than 45.degree. to the cutting block.
Parent Case Info
This is a Continuation, of application Ser. No. 07/979,064, filed Nov. 19, 1992, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
258457 |
Oct 1963 |
AUX |
2300686 |
Jul 1974 |
DEX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
979064 |
Nov 1992 |
|