US3820893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronizing apparatus
Assignee: Xerox Corp
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Filing: 1972-08-25
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Granted: 1974-06-28
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Expires: 1992-08-25
Abstract
Abstract Synchronizing apparatus is disclosed in accordance with the teachings of the present invention wherein the operation of a first device is regulated in accordance with the operation of a second device. The phase relationship between signals representing the operation of the first and second devices, respectively, is determined by comparison means which produces a pulse width modulated signal indicative of said phase relationship. Control signal generating means responds to the pulse width modulated signal to generate an analog signal having an amplitude established by said phase relationship. Feedback means, including variable frequency generating means, is controlled by the analog signal to modify the operation of the first device whereby said first device is urged into a synchronous relationship with said second device and the signals representative of the operation of said first and second devices admit of a desired phase relationship.
Inventors
- 👤 J Donohue
- 👤 J Kramer
- 👤 V Rodek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:46
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/60; G03G15/602; G03B; G03B27/00; G03B27/32; G03B27/50; G03G15/22; G03G15/28; G03G15/30; G03G15/305; H; H02; H02P; H02P23/00; H02P23/18; H02P23/186
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
353 words
Apparatus for printing prerecorded information comprising: a filmstrip bearing said prerecorded information and first uniformly spaced sense markings distributed along the length thereof; a web bearing second uniformly spaced sense markings distributed along the length thereof; filmstrip driving means mechanically coupled to said filmstrip for driving said filmstrip at a controllable velocity; web driving means mechanically coupled to said web for driving said web at a constant velocity; first detecting means fixedly disposed relative to said filmstrip for detecting the passage of each of said first uniformly spaced sense markings through a first predetermined position and for generating a first signal in response to each detected sense marking whereby the frequency of said generated signals is representative of the velocity of said filmstrip; second detecting means fixedly disposed relative to said web for detecting the passage of each of said second uniformly spaced sense markings through a second predetermined position and for generating a second signal in response to each detected sense marking whereby the frequency of said generated signals is representative of the velocity of said web; comparison means coupled to said first and second detecting means for generating signals indicative of the phase relationship between said first and second signals; control signal generating means coupled to said comparison means for generating a control signal having an amplitude determined by the signals generated by said comparison means; feedback meanS coupled to said filmstrip driving means and responsive to said control signal for adjusting the operating characteristics of said filmstrip driving means in accordance with the amplitude of said control signal whereby the velocity of said filmstrip is altered to obtain a desired value; optical means for projecting images of said information prerecorded on said filmstrip onto photoreceptor means, said optical means comprising magnifying means for projecting an image of said information prerecorded on said filmstrip at a predetermined magnification ratio onto said phototreceptor means, said web and filmstrip being driven at velocities such that the ratio therebetween is substantially equal to said magnification ratio, and means for printing images on said web in response to the images projected onto said photoreceptor means.
Claim 2
Dependent Claim
353 words
Apparatus for printing prerecorded information comprising: a filmstrip bearing said prerecorded information and first uniformly spaced sense markings distributed along the length thereof; a web bearing second uniformly spaced sense markings distributed along the length thereof; filmstrip driving means mechanically coupled to said filmstrip for driving said filmstrip at a controllable velocity; web driving means mechanically coupled to said web for driving said web at a constant velocity; first detecting means fixedly disposed relative to said filmstrip for detecting the passage of each of said first uniformly spaced sense markings through a first predetermined position and for generating a first signal in response to each detected sense marking whereby the frequency of said generated signals is representative of the velocity of said filmstrip; second detecting means fixedly disposed relative to said web for detecting the passage of each of said second uniformly spaced sense markings through a second predetermined position and for generating a second signal in response to each detected sense marking whereby the frequency of said generated signals is representative of the velocity of said web; comparison means coupled to said first and second detecting means for generating signals indicative of the phase relationship between said first and second signals; control signal generating means coupled to said comparison means for generating a control signal having an amplitude determined by the signals generated by said comparison means; feedback meanS coupled to said filmstrip driving means and responsive to said control signal for adjusting the operating characteristics of said filmstrip driving means in accordance with the amplitude of said control signal whereby the velocity of said filmstrip is altered to obtain a desired value; optical means for projecting images of said information prerecorded on said filmstrip onto photoreceptor means, said optical means comprising magnifying means for projecting an image of said information prerecorded on said filmstrip at a predetermined magnification ratio onto said phototreceptor means, said web and filmstrip being driven at velocities such that the ratio therebetween is substantially equal to said magnification ratio, and means for printing images on said web in response to the images projected onto said photoreceptor means.
Claim 3
Dependent Claim
44 words
The apparatus of claim 1 wherein said control signal generating means includes means for selectively varying the ratio between the velocity of said filmstrip and the velocity of said web in accordance with a variation of the ratio of magnification of said projected image.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |