US4733343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine tool numerical controller with a trouble stop function
Assignee: Toyoda Koki KK
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Filing: 1986-02-12
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Granted: 1988-03-22
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Expires: 2006-02-12
Abstract
Abstract A numerical controller for a grinding machine composed of a central processing unit (CPU), which is programmed to read out a numerical control program block by block from a memory device and to control a pulse generation circuit to generate pulses of such number and frequency as determined by the read-out data block, for supply to feed servomechanisms of the grinding machine. The CPU is also programmed to execute a trouble identification routine and a trouble processing routine at predetermined time intervals. The trouble identification routine enables the CPU to identify the kinds of troubles occurring in the grinding machine and to assort the troubles into a number of trouble modes. The trouble processing routine enables the CPU to operate so that a movable member of the grinding machine is immediately stopped or, for preventing the actual position of the movable member from differing from a present position thereof stored in the memory device, slowly stopped depending upon the kind of a trouble presently occurring in the grinding machine.
Inventors
- 👤 Takao Yoneda
- 👤 Yasuji Sakakibara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:51
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/406; G05B19/4063
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
In a machine control apparatus for controlling the movement of a movable member of a machine tool in accordance with a numerical control program, the improvement comprising: first stop control means for immediately stopping said movable member; second stop control means for stopping said movable member through the execution of a slow-down feed so as to prevent the actual position of said movable member from differing from a present position stored in said machine control apparatus; trouble identification means for identifying the kind of a trouble occurring in said machine tool; and trouble processing means for selectively operating said first and second stop control means depending upon the kind of the trouble identified by said trouble identification means, when said movable member is being moved in accordance with one data block of said numerical control program.
Claim 2
Dependent Claim
136 words
In a machine control apparatus for controlling the movement of a movable member of a machine tool in accordance with a numerical control program, the improvement comprising: first stop control means for immediately stopping said movable member; second stop control means for stopping said movable member through the execution of a slow-down feed so as to prevent the actual position of said movable member from differing from a present position stored in said machine control apparatus; trouble identification means for identifying the kind of a trouble occurring in said machine tool; and trouble processing means for selectively operating said first and second stop control means depending upon the kind of the trouble identified by said trouble identification means, when said movable member is being moved in accordance with one data block of said numerical control program.
Claim 3
Dependent Claim
204 words
A machine control apparatus capable of controlling the movement of a movable member of a machine tool in accordance with a numerical control program, said apparatus comprising: memory means for storing a numerical control program composed of a plurality of NC data blocks; read-out means for reading out said NC data blocks from said memory means block by block; pulse distribution means responsive to said NC data block read out by said read-out means for distributing feed pulses to a feed mechanism for said movable member in accordance with said read-out NC data block; trouble identification means for identifying a plurality of troubles occurring in said machine tool so as to selectively generate trouble mode signals including first and second trouble mode signals depending upon the kind of one of said troubles identified by said trouble identification means; first stop control means responsive to said first trouble mode signal from said trouble identification means for causing said feed mechanism to immediately discontinue its feed operation; and second stop control means responsive to said second trouble mode signal from said trouble identification means for causing said feed mechanism to immediately effect a slow-down feed and to discontinue its operation upon completion of said slow-down feed.
Claim 4
Dependent Claim
204 words
A machine control apparatus capable of controlling the movement of a movable member of a machine tool in accordance with a numerical control program, said apparatus comprising: memory means for storing a numerical control program composed of a plurality of NC data blocks; read-out means for reading out said NC data blocks from said memory means block by block; pulse distribution means responsive to said NC data block read out by said read-out means for distributing feed pulses to a feed mechanism for said movable member in accordance with said read-out NC data block; trouble identification means for identifying a plurality of troubles occurring in said machine tool so as to selectively generate trouble mode signals including first and second trouble mode signals depending upon the kind of one of said troubles identified by said trouble identification means; first stop control means responsive to said first trouble mode signal from said trouble identification means for causing said feed mechanism to immediately discontinue its feed operation; and second stop control means responsive to said second trouble mode signal from said trouble identification means for causing said feed mechanism to immediately effect a slow-down feed and to discontinue its operation upon completion of said slow-down feed.
Claim 5
Dependent Claim
97 words
A machine control apparatus as set forth in claim 2, wherein: said first stop control means comprises means responsive to said first trouble mode signal for immediately discontinuing the operation of said pulse distribution means before said movable member reaches an objective position designated by said read-out NC data block; and said second stop control means comprises means responsive to said second trouble mode signal for enabling said pulse distribution means to perform a slow-down feed operation so that said movable member is slowly stopped before reaching an objective position designated by said read-out NC data block.
Claim 6
Dependent Claim
75 words
A machine control apparatus as set forth in claim 3, wherein said trouble identification means selectively generates said first and second trouble mode signals and a third trouble mode signal depending upon the kind of the trouble identified by said trouble identification means, further comprising: emergency stop processing means responsive to said third trouble mode signal from said trouble identification means for immediately breaking electric power supplied to said feed servomechanism for said movable member.
Claim 7
Dependent Claim
56 words
A machine control apparatus as set forth in claim 2, further comprising: read-out inhibition means responsive to any of said first and second trouble mode signals from said trouble identification means for inhibiting the operation of said read-out means so as to prevent a successive NC data block from being read out from said memory means.
Claim 8
Dependent Claim
64 words
A machine control apparatus as set forth in claim 2, wherein said trouble identification means comprises: encoding means for generating a plurality of coded data which are respectively assigned to plural kinds of troubles occurring in said machine tool; and assorting means for identifying said coded data as corresponding to predetermined of said trouble mode signals including said first and second trouble mode signals.
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) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |