Fret saw blade having saw-teeth provided with sets and an automatic fret sawing machine having the fret saw blade

• US 4,236,432 A
• Filed: 09/11/1978
• Issued: 12/02/1980
• Est. Priority Date: 09/17/1977
• Status: Expired due to Term

• Current Assignee: Toshiba Kikai Kabushiki Kaisha (Toshiba Machine Company Limited)
• Original Assignee: Toshiba Kikai Kabushiki Kaisha (Toshiba Machine Company Limited)
• Inventors: Kawakami, Hideo, Endo, Masami, Yamazaki, Fumio
• Primary Examiner(s): Meister, J. M.
• Application Number:
  US05/941,173
• Time in Patent Office: 813 Days
• Field of Search: 83/835, 83/848-855, 83/747, 83/837, 83/784, 83/71, 30/355, 30/392, 145/31 AB, 76/112, 76/72, 76/28, 76/29
• US Class Current: 83/848
• CPC Class Codes: B23D 49/007 Jig saws, i.e. machine saws with a vertically reciprocating narrow saw blade chucked at both ends for contour cutting
• CPC Class Codes: B23D 61/12 Straight saw blades; Strap saw blades
• CPC Class Codes: Y10T 83/173 Arithmetically determined program
• CPC Class Codes: Y10T 83/6875 With means permitting tool to be rotatably adjusted about its cutting edge during cutting
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor
• CPC Class Codes: Y10T 83/935 Plural tooth groups

Abstract

In a fret saw blade having a shank portion and saw-teeth, the saw-teeth are formed in a manner that the centers of the cutting edges of some saw-teeth are depressed and deformed generally in V-shape so as to form sharp ends projecting beyond the side surfaces of the shank portion of the fret saw blade.

Claims

1. In a fret saw blade used for a numerically controlled automatic fret sawing machine and adapted to cut wood material, said fret saw blade having a shank, saw-teeth having non deformed cutting edges and at least one saw-tooth having a cutting edge the center of which is deformed to form sets, the improvement in which the cutting edge of said deformed saw-tooth is constructed to have a V-shaped groove extending substantially the full width of the saw tooth in order to form narrow sharp ends at both ends of the V-shaped groove projecting substantially horizontally beyond the side surfaces of said shank, whereby said fret saw blade can cut a wood material along a predetermined profile by preventing the deviation of said saw blade caused by fiber orientation of the wood material from said profile.