US4494206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for indexing a stepping rotatable member
Assignee: Fanuc Corp
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Filing: 1981-07-10
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Granted: 1985-01-15
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Expires: 2001-07-10
Abstract
Abstract A control device for indexing a stepping rotatable member, such as a turret of an NC lathe, comprising a means for generating code signals which generates different code signals at every stop position of the stepping rotatable member (TR), a means for generating strobe signals which generates the strobe signals used for reading said code signals at every stop position of the stepping rotatable member, a first comparator circuit which compares an indexing command value and the code signal, a counter which is preset by the code signal and which counts the strobe signal, and a second comparator circuit which compares a count value of the counter and the code signal value, the control device for indexing a stepping rotatable member outputs an end of indexing signal when both the comparator circuits detect coincidences.
Inventors
- 👤 Ryoji Imazeki
- 👤 Katsuaki Kusumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:22
CPC Classifications
B; B23; B23Q; B23Q16/00; B23Q16/02; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/39; G05B2219/00; G05B2219/30; G05B2219/34; G05B2219/34466; G05B2219/42; G05B2219/42318; G05B2219/49; G05B2219/49062
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
203 words
A control device for indexing stepping rotatable member comprising: a stepping rotatable member which can stop at a plurality of angular positions; an indexable rotative drive apparatus which rotates said stepping rotatable member; means for generating different positional code signals at every stop position of said stepping rotatable member; means for generating incremental strobe signals at every stop position of said stepping rotatable member; a control circuit which controls the operation of said indexable rotative drive apparatus; a numeric means for supplying indexing command values; a first comparator circuit which detects a coincidence between an indexing command value and said code signal; a counter, which can be preset by said control circuit and which counts said strobe signals; and a second comparator circuit which detects a coincidence between a count signal of said counter and said code signal value, such that said control circuit supplies a rotation command to said indexable rotative drive apparatus when said indexing command is supplied thereto from said numeric means, supplies a stop command to said rotative drive apparatus when said first comparator circuit detects a coincidence, and outputs an "end of indexing signal" to said numeric means when both said first and second comparator circuits detect coincidences.
Claim 2
Dependent Claim
203 words
A control device for indexing stepping rotatable member comprising: a stepping rotatable member which can stop at a plurality of angular positions; an indexable rotative drive apparatus which rotates said stepping rotatable member; means for generating different positional code signals at every stop position of said stepping rotatable member; means for generating incremental strobe signals at every stop position of said stepping rotatable member; a control circuit which controls the operation of said indexable rotative drive apparatus; a numeric means for supplying indexing command values; a first comparator circuit which detects a coincidence between an indexing command value and said code signal; a counter, which can be preset by said control circuit and which counts said strobe signals; and a second comparator circuit which detects a coincidence between a count signal of said counter and said code signal value, such that said control circuit supplies a rotation command to said indexable rotative drive apparatus when said indexing command is supplied thereto from said numeric means, supplies a stop command to said rotative drive apparatus when said first comparator circuit detects a coincidence, and outputs an "end of indexing signal" to said numeric means when both said first and second comparator circuits detect coincidences.
Claim 3
Dependent Claim
75 words
The control device of claim 1, wherein said means for generating code signals comprises: a code disc attached to said stepping rotatable member; a plurality of code dogs attached to said code disc, each code dog or group of code dogs corresponding to an angular position; and a plurality of stationary limit switches operable by one of said code dogs or group of code dogs, the output of said limit switches constituting said code signals.
Claim 4
Dependent Claim
59 words
The control device of claim 2, wherein said means for generating strobe signals comprises: a plurality of strobe dogs attached to said code disc such that a strobe dog corresponds to each of said angular positions; and a stationary limit switch operable by any one of said strobe dogs, the output of said limit switch constituting said strobe signals.
Claim 5
Dependent Claim
52 words
The control device of claim 3, wherein a strobe dog has a smaller engaging width than a code dog, such that a strobe signal, generated by a strobe dog operating a corresponding limit switch, is of less duration than a code signal, generated by a code dog operating a corresponding limit switch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |