US2120926A

US2120926A - Cutting stick

Info

Publication number: US2120926A
Application number: US122452A
Authority: US
Inventors: Norman S Baer
Original assignee: WILMINGTON FIBRE SPECIALTY COM
Current assignee: WILMINGTON FIBRE SPECIALTY Co; WILMINGTON FIBRE SPECIALTY COM
Priority date: 1937-01-26
Filing date: 1937-01-26
Publication date: 1938-06-14
Anticipated expiration: 1955-06-14

Description

-June,14,193s. NS BAER' A 2,120,926

7 CUTTING .s'TIcK Filed Jan. 26, 1957 Patented June 14, 1938 PATENT OFFICE CUTTING STICK Norman S. Baer, Montclair, N. J., assignor to Wilmington Fibre Specialty Company, a corporation of Delaware Application January 26, 1937, Serial No. 122,452

n Claims.

This invention relates to cutting sticks forv straight knife paper cutting machines used by printers, bookbinders and paper and blank book manufacturers, and aims to improve upon the 5 wood sticks and vulcanized fibre sticks heretofore commonly used for this work.

The hard wood cutting sticks heretofore used have a comparatively short life because of the tendency of the wood to crush adjacent to the line of cut under repeated cuts, so that the necessary shifting of the line of cut soon destroys the smooth cutting surface and results in ragged edges on some of the under sheets of the n pile. The cutting surfaces of vulcanized fibre cutting sticks have a useful life of several times that of the wood sticks, but also have a tendency to warp which destroys their usefulness before the cutting surfaces are destroyed as it produces f crooked cuts and is apt to result in injury to the According to my invention, the stick II is composed of two or more laminations extending from end to end and securely glued together to form a solid unitary structure, the outer laminations l2 being made of vulcanized fibre, and the inner laminations I3 being made of Wood veneer. Any suitable glue or cement may be used for securing the laminations together, depending upon the materials in contact at the particular joint. vention, Casco glue, 2120 EMX, is used for securing the outer laminations to the inner wood core, and soya bean glue is used for securing the wood veneer strips which form the inner core; but the invention is not restricted to these substances for making the joints.

The Wood core is preferably built up of alternate strips of different kinds of wood, such as commercial ply woods, synthetic boards or veneer strips, for example, arranged with the grain reversed to prevent warping. Any wood or sheet material having a uniform structure and a de- In the illustrative embodiment of the ingree of resiliency sufficient to absorb the impact of the cutting knife after severing the paper (or other material), but affording suicient resistance to the knife to enable it to make a clean cut, is suitable for the laminations in the core, and the invention is not rrestricted to a core containing laminations made of different kinds of wood.

The core may be faced with vulcanized fibre on all four sides if desired. Roughening the inner 10 face of the fibre strips is advantageous so as to increase the holding power of the glue and make a better bond between the fibre and the wood.

Cutting sticks made in accordance with my invention may be used on all faced sides and re- 15 versed top for bottom and end for end like the sticks heretofore used to present fresh cutting surfaces to the action of the knife, and are much more resilient than the vulcanized fibre sticks now in common use, thereby prolonging the serv- 20 `iceability of the knife. They are also somewhat cheaper to make than the solid vulcanized fibre sticks of equal quality.

Other advantages of the invention are the greater cleanness of the cut edges of the paper, 25 particularly the bottom layers, and the less frequent changing of sticks in straight blade sheet cutting machines than as compared with the wood sticks generally used for such machines today. 3o

I claim the following: Y

1. A cutting stick for the purposes described having a laminated wood core with the laminations parallel to the cutting face and facing strips of vulcanized fibre adhesively secured to the core.

2. A cutting stick for the purposes described having a non-warping wood core and facing strips of vulcanized fibre adhesively secured thereto.

3. A cutting stick for the purposes described having a non-warping wood core and facing strips 40 of harder, tougher, more uniform material with respect to strength and density adhesively secured to the core.

4. A solid cutting stick for the purposes described having a resilient core comprising' a plu- 45 rality of strips of wood arranged one on topy of another with the grain parallel to the cutting face and top and bottom facing strips of vulcanized fibre adhesively secured to the core.

5. A cutting stick for the purposes described 50 having a core comprising laminations of wood with the grain extending parallel to the cutting face and reversed top for bottom in vertically adjoining layers, and facing strips of vulcanized NORMAN S. BAER.