US3760189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion detecting apparatus
Assignee: Niagara Machine and Tool Works
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Filing: 1972-10-10
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Granted: 1973-09-18
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Expires: 1992-10-10
Abstract
Abstract Detecting apparatus for providing a signal when a rotating machine element stops and comprising a pulse generating means mechanically coupled to the machine element for producing electrical pulses at a frequency directly proportional to the speed of rotation of the element. The pulses are applied through a pulse shaper to signal generating means for producing, in response to the occurrence of each pulse, first and second signals which decrease and increase, respectively, in a regular and continuous, preferably linear, manner until the next pulse occurs whereupon the signals are repeated. The signals are applied to a comparison circuit which provides an indicating signal in response to a predetermined relationship between the first and second signals indicating that the machine element has stopped rotating, and the indicating signal is used to control the machine. In preferred form, the element is a cam fixed to the shaft of rotary switching apparatus which is coupled to the drive shaft of a machine such as a power press and which controls the machine.
Inventors
- 👤 C Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:51
CPC Classifications
G; G01; G01P; G01P13/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
In combination with a machine having an element which is rotated during operation of said machine, means for detecting when said rotating element stops comprising: a. pulse generating means mechanically coupled to said element for producing electrical pulses at a frequency directly proportional to the speed of rotation of said element; b. signal generating means connected to said pulse generating means for producing, in response to the occurrence of each pulse, first and second signals each varying with time in a regular, continuous manner until the next pulse occurs whereupon said signals are repeated and again vary in the same manner as before; and c. comparison means connected to said signal generating means for providing an indicating signal in response to the occurrence of a predetermined relationship between said first and second signals indicative that rotation of said element has stopped.
Claim 2
Dependent Claim
141 words
In combination with a machine having an element which is rotated during operation of said machine, means for detecting when said rotating element stops comprising: a. pulse generating means mechanically coupled to said element for producing electrical pulses at a frequency directly proportional to the speed of rotation of said element; b. signal generating means connected to said pulse generating means for producing, in response to the occurrence of each pulse, first and second signals each varying with time in a regular, continuous manner until the next pulse occurs whereupon said signals are repeated and again vary in the same manner as before; and c. comparison means connected to said signal generating means for providing an indicating signal in response to the occurrence of a predetermined relationship between said first and second signals indicative that rotation of said element has stopped.
Claim 3
Dependent Claim
31 words
The combination according to claim 1, further including means connected to said comparison means and to said machine for controlling the operation of said machine in response to said indicating signal.
Claim 4
Dependent Claim
32 words
The combination according to claim 1, wherein said element is a cam rigidly secured to the shaft of rotary switching apparatus coupled to the drive of said machine for controlling said machine.
Claim 5
Dependent Claim
33 words
The combination according to claim 3, wherein said machine is a power press and said rotary switching apparatus is connected to electrical circuits for controlling the ram clutch and brake of said press.
Claim 6
Dependent Claim
35 words
The combination according to claim 4, further including means connected to said comparison means and to said press control circuits for stopping movement of the ram of said press in response to said indicating signal.
Claim 7
Dependent Claim
25 words
The combination according to claim 1, wherein said cam has a plurality of lobes or rise portions at equally spaced locations around the periphery thereof.
Claim 8
Dependent Claim
52 words
The combination according to claim 1, wherein said first and second signals produced by said signal generating means decrease and increase, respectively, with time in a linear manner toward the same level of magnitude and in a manner whereby said signals do not coincide as long as said pulses continue to appear.
Claim 9
Dependent Claim
65 words
The combination according to claiM 7, wherein said first and second signals coincide if the next pulse fails to occur at its regular time, the time of coincidence of said signals occuring a short period of time after the time when the leading edge of the next pulse would have been present, said time period being less than the duration of each of said pulses.
References Cited (Backward Citations)
US3261007A
Cited
US3559205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |