US3794902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backlash compensating apparatus for numerically controlled machine tool
Assignee: Individual
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Filing: 1973-02-12
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Granted: 1974-02-26
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Expires: 1993-02-12
Abstract
Abstract The backlash in the feed screw system of a machine tool is automatically compensated so as to obtain a high degree of machining accuracy. When the direction of the feed motion is required to be changed, the normal feed motion is temporarily interrupted, and backlash compensating data are supplied to a shift register, which is also used for normal feed operation, so that backlash compensation may be accomplished. Thereafter, a pulse generator supplies a series of pulse signals to the shift register to trigger drive pulse signals which are supplied to a pulse motor, the drive pulse signals being generated in accordance with the backlash compensating data.
Inventors
- 👤 T Ishigaki
- 👤 H Nishimura
- 👤 K Kanou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:12
CPC Classifications
B; B23; B23Q; B23Q23/00; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B19/418; G05B19/4181; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41037; G05B2219/41038; G05B2219/41326; Y; Y02; Y02P; Y02P90/00; Y02P90/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
259 words
In a computer controlled machine tool control system including: a computer for controlling the operation of a machine tool in accordance with computer control data, shift register means operably connected to said computer to receive a predetermined amount of pulse distribution data therefrom, said shift register means being capable of providing drive pulse signlas to pulse motors in accordance with said pulse distribution data, pulse generating means for generating a series of pulse signals at a frequency determined by said computer control data, said pulse signals being supplied to said shift register means to trigger said drive pulse signals provided by said shift register means; shift finish detecting means for counting the number of said pulse signals supplied to said shift register means, counter means connected to said shift register means for counting the number of drive pulse signals supplied to said pulse motors, the improvement comprising: a backlash compensating apparatus including backlash compensation detecting means connected to said computer and providing first signals when the direction of the existing feed motion is different from the previous direction thereof, compensation data presetting means responsive to one of said first signals to supply backlash compensation data to said shift register means and, switching means responsive to another of said first signals for stopping the supply of said pulse distribution data to said shift register means and making said counter means inoperative, said shift finish detecting means being capable of generating a backlash compensation finish signal when a predetermined number of said pulse signals is applied to said shift register means.
Claim 2
Dependent Claim
259 words
In a computer controlled machine tool control system including: a computer for controlling the operation of a machine tool in accordance with computer control data, shift register means operably connected to said computer to receive a predetermined amount of pulse distribution data therefrom, said shift register means being capable of providing drive pulse signlas to pulse motors in accordance with said pulse distribution data, pulse generating means for generating a series of pulse signals at a frequency determined by said computer control data, said pulse signals being supplied to said shift register means to trigger said drive pulse signals provided by said shift register means; shift finish detecting means for counting the number of said pulse signals supplied to said shift register means, counter means connected to said shift register means for counting the number of drive pulse signals supplied to said pulse motors, the improvement comprising: a backlash compensating apparatus including backlash compensation detecting means connected to said computer and providing first signals when the direction of the existing feed motion is different from the previous direction thereof, compensation data presetting means responsive to one of said first signals to supply backlash compensation data to said shift register means and, switching means responsive to another of said first signals for stopping the supply of said pulse distribution data to said shift register means and making said counter means inoperative, said shift finish detecting means being capable of generating a backlash compensation finish signal when a predetermined number of said pulse signals is applied to said shift register means.
Claim 3
Dependent Claim
119 words
A system as in claim 1, wherein said backlash compensating apparatus further comprises: mode register means connected to said computer for storing signals corresponding to the direction and the axis of feed motion, and said backlash compensation detecting means comprises a first flip-flop means operably connected to said mode register means, first gate means connected to said mode register and said first flip-flop means so as to register the direction of said feed motion in said first flip-flop means, and second gate means connected to said mode register and said first gate means so as to generate a backlash compensating signal when the dIrections of the previous feed motion and the existing feed motion are different from each other.
Claim 4
Dependent Claim
76 words
A system as in claim 1, wherein said compensation data presetting means comprises: a plurality of first gate means connected to said compensation detecting means, each of said first gate means being connected to a predetermined number of second gate means which are connected to said shift register means, and a plurality of backlash setting switches connected to to said first gate means so as to supply said backlash compensating data to said shift register means.
Claim 5
Dependent Claim
33 words
A system as in claim 1, wherein said backlash compensating apparatus furJher comprises: a data presetting means for presetting pulse distribution data to said shift register means and operably connected to said computer.
Claim 6
Dependent Claim
54 words
A system as in claim 4, wherein said switching means comprises: gate means connected to said computer and said backlash compensation detecting means for initiating a data control signal so that said computer supplies pulse distribution data to said data presetting means when said backlash compensation detecting means does not provide said first signals.
Claim 7
Dependent Claim
60 words
A system as in claim 1, where said switching means comprises: gate means connected to said backlash compensation detecting means, and flip-flop means connected to said gate means, said gate means being operable to provide a signal to said flip-flop means in response to said other of said first signals so that said flip-flop means makes said counter means inoperative.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |