Method for monitoring saw blade stability and controlling work feed rate on circular saw and bandsaw machines

• US 4,644,832 A
• Filed: 03/21/1985
• Issued: 02/24/1987
• Est. Priority Date: 03/21/1985
• Status: Expired due to Term

• Current Assignee: Smith H. Reid, The Main Children's Trust
• Original Assignee: Smith H. Reid
• Inventors: Smith, H. Reid
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Knoble, John L.
• Application Number:
  US06/714,466
• Time in Patent Office: 705 Days
• Field of Search: 83/72, 83/62, 83/74, 83/62.1, 83/75, 83/76, 83/522, 83/365, 83/403.1, 364/475, 318/39, 73/658, 73/660, 73/DIG. 1
• US Class Current: 83/72
• CPC Class Codes: B23D 47/005 Vibration-damping
• CPC Class Codes: B23D 59/002 for the position of the saw blade mounting for swiveling or tilting a circular saw blade B27B5/36; portable power-driven circular saws with adjustment for cutting depth or amount of tilting B27B9/02
• CPC Class Codes: B23D 59/008 comprising computers
• CPC Class Codes: Y10T 83/141 With means to monitor and control operation [e.g., self-regulating means]
• CPC Class Codes: Y10T 83/6475 With means to regulate work-feed speed

Abstract

A position sensing transducer senses the lateral movement of the saw blade resulting from variable operating conditions. These sensed values are displayed on instrumentation for use by the saw machine operator, and are also used to automatically control work feed rates and/or rim speed of the saw blade. These automatica corrections and/or compensations maintain lateral movement of the saw blade within established limits. Optimized work feed rates and superior cutting accuracy result from this precise automatic control.

Claims

1. A method of controlling vibration in saw blades comprising:

detecting lateral movement of saw blade;

using signal conditioning means to provide an electrical signal proportional to said saw blade movement;

calculating referenced mean displacement, peak to peak, and displacement RMS signals;

comparing the conditioned signals to assigned levels; and

controlling the speed of the saw blade responsive to said comparison by predetermined program logic.

2. A method according to claim 1 whereby critical saw blade vibrations are by-passed.

3. A method of controlling vibration is saw blades comprising:

detecting lateral movement of saw blade;

using signal conditioning means to provide an electrical signal proportional to said saw blade movement;

calculating referenced mean displacement, peak to peak, and displacement RMS signals;

comparing the conditioned signals to assigned levels; and

controlling the work feed rate responsive to said comparison by predetermined program logic.

4. A method according to claim 3 whereby critical saw blade vibrations are by-passed.