US3833843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drive controls
Assignee: Masson Scott Thrissell Engineering Ltd
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Filing: 1973-01-18
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Granted: 1974-09-03
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Expires: 1993-01-18
Abstract
Abstract Two rotary members are required to rotate not necessarily with the same or related circumferential speeds throughout a cyclic period, but at least during part of each revolution the speeds should have a given relationship. The relative cyclic periods are also required to be adjustable while maintaining that relationship intact. The speed of one rotary member over at least the part revolution is detected and compared with the speed of the other member detected over the same period. Any departure of the speeds from their required relationship gives a signal that is used to adjust the drive to one of the members to restore that relationship. When the relative cyclic periods are altered the correcting circuit follows that adjustment and maintains the relationship.
Inventors
- 👤 W Bossons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:51
CPC Classifications
B; B23; B23D; B23D36/00; B23D36/0008; B23D36/0033; B23D36/0041; H; H02; H02P; H02P5/00; H02P5/46; H02P5/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
Apparatus for controlling the rotation of a first member that rotates at cyclically non-uniform speed per revolution synchronously with the rotation of a second member so that circumferential speeds of said members have a predetermined relationship over part of a revolution of said first member, comprising a cyclically variable transmission in the drive to the first member, said transmission including means to create said cyclically non-uniform speed per revolution of said first member, signal producing means associated with each member for giving an output representative of the associated speed over a period corresponding to said part revolution, means for signalling the commencement of said part revolution, comparator means responsive to said signalling means and to said outputs to give a signal indicating comparative speeds over said part revolution, and control means for the variable transmission governed by the comparative signal to adjust said transmission to maintain the rotation of said first member during said part revolution in said predetermined relationship with said second member.
Claim 2
Dependent Claim
164 words
Apparatus for controlling the rotation of a first member that rotates at cyclically non-uniform speed per revolution synchronously with the rotation of a second member so that circumferential speeds of said members have a predetermined relationship over part of a revolution of said first member, comprising a cyclically variable transmission in the drive to the first member, said transmission including means to create said cyclically non-uniform speed per revolution of said first member, signal producing means associated with each member for giving an output representative of the associated speed over a period corresponding to said part revolution, means for signalling the commencement of said part revolution, comparator means responsive to said signalling means and to said outputs to give a signal indicating comparative speeds over said part revolution, and control means for the variable transmission governed by the comparative signal to adjust said transmission to maintain the rotation of said first member during said part revolution in said predetermined relationship with said second member.
Claim 3
Dependent Claim
72 words
Apparatus as claimed in claim 1, and prime mover means for said members, and means between said prime mover means and one of said members to maintain synchronism of the mean speed of rotation of said first member and the speed of rotation of said second member. 3. Apparatus as claimed in claim 1, wherein the signal producing means are digital and include means for producing pulses according to the rotational speeds.
Claim 4
Dependent Claim
29 words
Apparatus as claimed in claim 3, wherein said pulse producing means comprise radial gratings that rotate with said first and second members and sensing means associated with each grating.
Claim 5
Dependent Claim
24 words
Apparatus as claimed in claim 1, wherein said signal producing means are analogue and include means for producing continuous signals indicative of rotational speed.
Claim 6
Dependent Claim
25 words
Apparatus as claimed in claim 1, wherein the means for signalling the commencement of said part revolution includes a trip rotating with said first member.
Claim 7
Dependent Claim
27 words
Apparatus as claimed in claim 1 comprising a single prime mover for both members, and infinitely variable transmission means between said prime mover and said second member.
Claim 8
Dependent Claim
33 words
Apparatus as claimed in claim 1 comprising separate prime movers for said members, means for monitoring the comparative speeds of said members and further control means governing said second member to maintain synchronism.
Claim 9
Dependent Claim
44 words
Apparatus as claimed in claim 8, wherein said monitoring means are said signal producing means, the signal producing means for the first member being arranged to give an output throughout a revolution, and means for averaging this output to indicate the mean cyclic speed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |