US3720135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feed rate controller
Assignee: Kearney and Trecker Corp
•
Filing: 1971-02-01
•
Granted: 1973-03-13
•
Expires: 1991-02-01
Abstract
Abstract An apparatus to eliminate the stalling of a machine tool spindle electric drive motor when a cutting tool secured in the spindle encounters a hard spot in a workpiece. A current relay is connected in the spindle motor circuit and is energized upon the occurrence of an abnormal load on the spindle motor. A normally closed contact of the relay is located in the feed axis drive system and effects the interruption of the command pulses to the feed axis drive system.
Inventors
- 👤 K Merner
- 👤 R Stobbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:39
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4163; B; B23; B23Q; B23Q5/00; B23Q5/22; B23Q5/28; H; H02; H02P; H02P29/00; H02P29/40; G05B2219/00; G05B2219/30; G05B2219/49; G05B2219/49078; G05B2219/49092; Y; Y10; Y10T; Y10T408/00; Y10T408/08; Y10T408/13; Y10T408/14; Y10T408/16; Y10T408/17; Y10T408/172; Y10T409/00; Y10T409/30; Y10T409/306664; Y10T409/306776; Y10T409/306832; Y10T409/306944
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
In a machine tool having a rotatable tool spindle and a work support; a spindle motor connected to rotate said tool spindle; feed drive means operative to effect relative movement between said spindle and said work support to produce relative movement between a rotating cutter carried by said spindle and a workpiece carried by said work support; a positioning control system issuing control signals to regulate the operation of said feed drive means; and overload means responsive to an overload on said spindle motor to interrupt the flow of control signals and thereby interrupt the operation of said feed drive means to relieve the overload on said spindle motor and thereby restore operation of said feed drive means so that said feed drive means will operate intermittently when the cutter is encountering unusual resistance to its cutting operation.
Claim 2
Dependent Claim
138 words
In a machine tool having a rotatable tool spindle and a work support; a spindle motor connected to rotate said tool spindle; feed drive means operative to effect relative movement between said spindle and said work support to produce relative movement between a rotating cutter carried by said spindle and a workpiece carried by said work support; a positioning control system issuing control signals to regulate the operation of said feed drive means; and overload means responsive to an overload on said spindle motor to interrupt the flow of control signals and thereby interrupt the operation of said feed drive means to relieve the overload on said spindle motor and thereby restore operation of said feed drive means so that said feed drive means will operate intermittently when the cutter is encountering unusual resistance to its cutting operation.
Claim 3
Dependent Claim
138 words
In a machine tool having a rotatable tool spindle and a work support; a spindle motor connected to rotate said tool spindle; feed drive means operative to effect relative movement between said spindle and said work support to produce relative movement between a rotating cutter carried by said spindle and a workpiece carried by said work support; a positioning control system issuing control signals to regulate the operation of said feed drive means; and overload means responsive to an overload on said spindle motor to interrupt the flow of control signals and thereby interrupt the operation of said feed drive means to relieve the overload on said spindle motor and thereby restore operation of said feed drive means so that said feed drive means will operate intermittently when the cutter is encountering unusual resistance to its cutting operation.
Claim 4
Dependent Claim
138 words
In a machine tool having a rotatable tool spindle and a work support; a spindle motor connected to rotate said tool spindle; feed drive means operative to effect relative movement between said spindle and said work support to produce relative movement between a rotating cutter carried by said spindle and a workpiece carried by said work support; a positioning control system issuing control signals to regulate the operation of said feed drive means; and overload means responsive to an overload on said spindle motor to interrupt the flow of control signals and thereby interrupt the operation of said feed drive means to relieve the overload on said spindle motor and thereby restore operation of said feed drive means so that said feed drive means will operate intermittently when the cutter is encountering unusual resistance to its cutting operation.
Claim 5
Dependent Claim
86 words
A machine tool according to claim 1 wherein said spindle motor is an electric motor; and said overload means is a current relay connected in the circuit to said motor so that it is actuated by the increased current in said circuit caused by the overload on said motor; and said relay has a normally closed contact connected in a conductor carrying said control signals so that actuation of said relay opens said normally closed contact to thereby interrupt the operation of said feed drive means.
Claim 6
Dependent Claim
51 words
A machine tool according to claim 1 wherein said positioning control system is a numerical control circuit for regulating the operation of said feed drive means; and the actuation of said overload means serves to interrupt the flow of command pulses to thereby interrupt the operation of said feed drive means.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |