Modulated forming machine

• US 4,524,812 A
• Filed: 09/29/1982
• Issued: 06/25/1985
• Est. Priority Date: 08/11/1982
• Status: Expired due to Fees

• Current Assignee: Peter H. Murphy
• Original Assignee: Peter H. Murphy
• Inventors: Murphy, Peter H.
• Primary Examiner(s): Meister, James M.
• Application Number:
  US06/427,701
• Time in Patent Office: 1,000 Days
• Field of Search: 83/72, 83/74, 83/471.2, 83/477.2, 144/144 A, 144/134 A, 144/134 C, 144/136 R, 144/356, 409/148, 409/183, 408/11, 318/39
• US Class Current: 144/135.2
• CPC Class Codes: B23D 45/021 with the saw blade mounted on a carriage B23D45/06, B23D45/046 take precedence
• CPC Class Codes: B23D 47/08 of devices for bringing the circular saw blade to the workpiece or removing same therefrom
• CPC Class Codes: B23D 59/001 Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade measuring in general G01; controlling in general G05
• CPC Class Codes: B23Q 1/5481 followed parallelly by a single rotating pair
• CPC Class Codes: B23Q 11/08 Protective coverings for parts of machine tools; Splash guards
• CPC Class Codes: B23Q 15/013 Control or regulation of feed movement B23Q15/12 takes precedence
• CPC Class Codes: B23Q 5/385 using a gear and rack mechanism or a friction wheel co-operating with a rail
• CPC Class Codes: Y10T 409/304704 In response to cutter or cutter carriage
• CPC Class Codes: Y10T 409/306664 including means to infeed rotary cutter toward work
• CPC Class Codes: Y10T 83/141 With means to monitor and control operation [e.g., self-regulating means]
• CPC Class Codes: Y10T 83/773 Work-support includes passageway for tool [e.g., slotted table]

Abstract

A material forming machine comprising a forming tool driven by a forming tool motor, a workpiece, a feed drive motor, a sensor, and a reference signal, wherein said sensor varies the speed of the feed drive motor by responding to variations of the speed of the forming tool'"'"'s motion, and wherein the reference signal remains constant. Said machine performs sawing, shaping, milling, drilling, hammering, shearing, chiseling, and cutting on irregularly shaped workpieces, having variations in density.

Claims

1. A material forming machine comprising a forming tool, driven by a forming tool motor, a workpiece, a feed drive motor, sensing means which generate a electrical signal which is proportional to the rotational speed of the forming tool motor, a constant reference signal greater than zero and equal in magnitude, but opposite in sign to the signal produced by the sensing means at the minimum desired rotational speed of the forming tool motor, and a summing amplifier to combine the signal from the sensing means with the reference signal to vary the speed of the feed drive motor in response to variations in the speed of the forming tool motor.

2. A material forming machine according to claim 1 wherein the sensing means is a direct current generator.

3. A material forming machine according to claim 1 wherein the sensing means is an optic encoder.

4. A material forming machine according to claim 1 wherein the sensing means is a hall effect encoder.

5. A material forming machine according to claim 1 wherein the summing amplifier is a diode.

6. A material forming machine according to claim 1 wherein the summing amplifier is a zener diode.