US3774097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic positioning system
Assignee: Individual
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Filing: 1971-09-09
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Granted: 1973-11-20
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Expires: 1991-09-09
Abstract
Abstract In a machine having two relatively movable members, such as the bed and carriage of a machine tool, drive means for moving one of the members, and control means coupled to the drive means, a positioning system for changing the relative movement of the machine members after a predetermined distance has been traveled. A retentive member of magnetizable material, such as a steel tape or rod, is mounted on one of the machine members, for example on the carriage, and is disposed generally parallel to the direction of relative movement. A magnetic recording means is mounted on the other machine member for magnetizing the retentive member at a discrete point thereon corresponding to the relative position of the machine members at which movement is to be changed. This recording is sensed by means which develops an electrical signal for causing the machine control to change the movement, for example to stop the carriage.
Inventors
- 👤 J Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:36
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/12; G05B19/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
247 words
In a machine having first and second relatively movable members, drive means for moving one of said members, and control means coupled to said drive means, a positioning system for changing the relative movement of said machine members after a predetermined distance has been traveled, said system comprising: a. a retentive member of magnetizable material mounted on one of said machine members, said retentive member being elongated and flexible; b. recording means on the other of said machine members for magnetizing said retentive member at a discrete point thereon corresponding to the relative position of said first and second machine members at which relative movement is to be changed; c. sensing means on said other machine member for sensing the recording on said retentive member during relative movement of said machine members and for producing an output signal in response thereto; d. means coupling said sensing means to said control means whereby in response to a signal produced by said sensing means said control means causes a change in the relative movement of said machine members; e. a support frame mounting said retentive member on said Machine member, said frame being secured to said retentive member at opposite ends thereof to permit flexing thereof; and f. magnetic erasing means on said other machine member, said erasing means being disposed toward a surface of said retentive member opposite the surface toward which said recording means is disposed, said erasing means being substantially in alignment with said recording means.
Claim 2
Dependent Claim
247 words
In a machine having first and second relatively movable members, drive means for moving one of said members, and control means coupled to said drive means, a positioning system for changing the relative movement of said machine members after a predetermined distance has been traveled, said system comprising: a. a retentive member of magnetizable material mounted on one of said machine members, said retentive member being elongated and flexible; b. recording means on the other of said machine members for magnetizing said retentive member at a discrete point thereon corresponding to the relative position of said first and second machine members at which relative movement is to be changed; c. sensing means on said other machine member for sensing the recording on said retentive member during relative movement of said machine members and for producing an output signal in response thereto; d. means coupling said sensing means to said control means whereby in response to a signal produced by said sensing means said control means causes a change in the relative movement of said machine members; e. a support frame mounting said retentive member on said Machine member, said frame being secured to said retentive member at opposite ends thereof to permit flexing thereof; and f. magnetic erasing means on said other machine member, said erasing means being disposed toward a surface of said retentive member opposite the surface toward which said recording means is disposed, said erasing means being substantially in alignment with said recording means.
Claim 3
Dependent Claim
43 words
A positioning system as defined in claim 1, wherein said first and second machine members move in directions parallel to each other and wherein said retentive member is disposed so that longitudinal axis thereof is generally parallel to the direction of relative movement.
Claim 4
Dependent Claim
26 words
A positioning system as defined in claim 1, wherein said control means causes stopping of said relative movement when said sensing means produces an output signal.
Claim 5
Dependent Claim
30 words
A positioning system as defined in claim 1, wherein said control means causes a change in the rate of said relative movement when said sensing means produces an output signal.
Claim 6
Dependent Claim
84 words
A positioning system as defined in claim 1, wherein said control means decreases the rate of said relative movement in response to a first signal from said sensing means and causes stopping of said relative movement in response to a second signal from said sensing means whereby said retentive member can be recorded at two spaced locations therealong corresponding to the relative positions of said first and second machine members where relative movement therebetween is to be decreased in rate and then stopped, respectively.
Claim 7
Dependent Claim
16 words
A positioning system as defined in claim 1, wherein said frame is of temperature stabilized material.
Claim 8
Dependent Claim
84 words
A positioning system as defined in claim 1, wherein said recording means and said sensing means comprise a core of magnetic material having an air gap positioned adjacent said retentive member, a winding on said core, and switching means having a first position connecting said winding to a direct voltage source for energizing said winding during recording and having a second position connecting said winding to a source of bias voltage and to said coupling means for sensing a recording on said retentive member.
Claim 9
Dependent Claim
43 words
A positioning system as defined in claim 7, wherein said coupling means comprises amplifier means connected to said switching means and relay means connected in controlled relation to the output of said amplifier means and in controlling relation to said machine control 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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |