Circular saw cutting machine

• US 5,974,927 A
• Filed: 07/09/1997
• Issued: 11/02/1999
• Est. Priority Date: 07/12/1996
• Status: Expired due to Fees

• Current Assignee: Tsune Seiki Co. Ltd.
• Original Assignee: Tsune Seiki Co. Ltd.
• Inventors: Tsune, Ryoichi
• Primary Examiner(s): Rachuba, M.
• Assistant Examiner(s): PRYOR, SEAN AUGUSTUS
• Application Number:
  US08/890,190
• Time in Patent Office: 846 Days
• Field of Search: 83/490, 83/452, 83/526, 83/471.2
• US Class Current: 83/490
• CPC Class Codes: B23D 47/12 of drives for circular saw blades
• CPC Class Codes: B23Q 11/0032 Arrangements for preventing or isolating vibrations in parts of the machine B23B29/022, B23D47/005 take precedence; means for damping or suppressing vibrations, in general F16F
• CPC Class Codes: B23Q 5/04 rotary shafts, e.g. working-spindles
• CPC Class Codes: F16H 57/12 Arrangements for adjusting or for taking-up backlash not provided for elsewhere
• CPC Class Codes: Y10T 83/7487 Means to clamp work
• CPC Class Codes: Y10T 83/7693 Tool moved relative to work-support during cutting
• CPC Class Codes: Y10T 83/7788 Tool carrier oscillated or rotated
• CPC Class Codes: Y10T 83/8694 With brake or blocking means

Abstract

A circular saw having a cutting position for cutting a workpiece at a predetermined location thereof, a gripper for gripping a workpiece at a predetermined location on the workpiece, a drive having a plurality of gears including final and penultimate stage gears, and a backlash eliminator for braking the final stage gear for eliminating backlash between the final and the penultimate stage gears upon the initiation of cutting a workpiece at the cutting position.

Claims

1. A circular saw which comprises

(i) a cutting position for cutting with a saw blade a workpiece at a predetermined location thereof,

(ii) means for gripping said workpiece at a predetermined location on the workpiece,

(iii) a drive having a plurality of gears, including final and penultimate stage gears, said final gear being mounted on a common shaft with the saw blade, and

(iv) a backlash eliminator in association with said final gear for braking said final gear for eliminating backlash between said final and said penultimate gears upon the initiation of cutting and during cutting a workpiece at said cutting position.

2. The circular saw of claim 1, wherein said backlash eliminator further comprises a brake gear meshing with said final stage gear, a brake shaft for mounting said brake gear, a brake disk having a peripheral portion and being integral with said brake shaft, a pair of two brake calipers each provided with brake pads for gripping a predefined part of said peripheral portion of said brake disk, and a hydraulic actuating cylinder for actuating said calipers between a braking position where said brake pads grip the brake disk, and a release position where said brake pads are located remote from said brake disk.

3. The circular saw of claim 2, wherein each of said calipers is adapted to move independently of the other caliper, said hydraulic actuating cylinder being adapted to dispose said calipers in a substantially parallel relationship to each other.

4. The circular saw of claim 2, wherein each of said calipers has a tip end and a rear end, and said calipers are pivotably connected to each other about a pivot shaft, for alternately opening and closing said tip and rear ends of said calipers about said pivot shaft.