US3752969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for updating the position dimension of a numerically controlled machine tool
Assignee: Allen Bradley Co LLC
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Filing: 1971-09-24
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Granted: 1973-08-14
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Expires: 1991-09-24
Abstract
Abstract A machine position dimension contained in a storage register is compared with a command position dimension contained in a position unit to obtain a digital error signal for controlling a machine tool. Increments of displacement are sensed by an eightposition shaft encoder. The shaft encoder output is periodically compared with the least significant digit in the storage register, and when necessary, counts are generated to the storage register to update the machine position dimension.
Inventors
- 👤 W Kiffmeyer
- 👤 J Radtke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:05
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/39; G05B19/21; G05B19/23; G05B19/231; G05B2219/00; G05B2219/30; G05B2219/34; G05B2219/34236; G05B2219/35; G05B2219/35233; G05B2219/37; G05B2219/37104; G05B2219/37155
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A method of updating a machine position dimension contained in a storage register, the steps comprising: sensing machine displacement with a digital absolute position transducer; periodically comparing the number of counts embodied in the position transducer output with the number of counts embodied in the least significant digit in said storage register; and advancing the count embodied in the least significant digit in said storage register when said compared counts differ by predetermined amounts.
Claim 2
Independent Claim
74 words
A method of updating a machine position dimension contained in a storage register, the steps comprising: sensing machine displacement with a digital absolute position transducer; periodically comparing the number of counts embodied in the position transducer output with the number of counts embodied in the least significant digit in said storage register; and advancing the count embodied in the least significant digit in said storage register when said compared counts differ by predetermined amounts.
Claim 3
Dependent Claim
48 words
The method as recited in claim 1 wherein the count embodied in said least significant digit in said storage register is advanced by adding counts when said machine is displaced in one direction and is advanced by subtracting counts when said machine is displaced in the opposite direction.
Claim 4
Dependent Claim
121 words
A position transducer for a numerically controlled machine, the combination comprising: a digital absolute position transducer connected to sense and indicate increments of machine displacement; a storage register operable to receive and store counts which form the machine position dimension, each count representing one increment of machine displacement; and a comparator connected to said digital absolute position transducer and said storage register, said comparator being operable to periodically update the counts in said storage register by first arithmetically comparing the number of counts embodied in the least significant digit of said machine position dimension with thE number of increments indicated by said digital absolute position transducer, and when said numbers differ by predetermined amounts, generate a count to said storage register.
Claim 5
Dependent Claim
121 words
A position transducer for a numerically controlled machine, the combination comprising: a digital absolute position transducer connected to sense and indicate increments of machine displacement; a storage register operable to receive and store counts which form the machine position dimension, each count representing one increment of machine displacement; and a comparator connected to said digital absolute position transducer and said storage register, said comparator being operable to periodically update the counts in said storage register by first arithmetically comparing the number of counts embodied in the least significant digit of said machine position dimension with thE number of increments indicated by said digital absolute position transducer, and when said numbers differ by predetermined amounts, generate a count to said storage register.
Claim 6
Dependent Claim
53 words
The position transducer as recited in claim 3 wherein said digital absolute position transducer is an encoder having a capacity sufficient to generate X number of discrete digital output signals, where X is substantially equal to the maximum possible number of counts embodied in the least significant digit of said machine position dimension.
Claim 7
Dependent Claim
63 words
The position transducer as recited in claim 4 wherein said comparator includes a subtractor having a first set of inputs connected to read the number of counts embodied in the least significant digit of said machine position dimension, a second set of inputs connected to receive the digital signals from said encoder, and a set of output terminals connected to said storage register.
Claim 8
Dependent Claim
39 words
The position transducer as recited in claim 5 wherein said comparator includes logic gate means connected to said first and second set of subtractor input terminals for reversing the connections thereof when said machine changes its direction of movement.
References Cited (Backward Citations)
US3172026A
Cited
US3513371A
Cited
US3500023A
Cited
US3517286A
Cited
US3585376A
Cited
US3665280A
Cited
US3612840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |