US3757352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digitally pulsed dielectric line scan recorder
Assignee: Revvity Inc
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Filing: 1972-01-06
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Granted: 1973-09-04
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Expires: 1992-01-06
Abstract
Abstract A conductive paper web with a dielectric coating is fed over a writing roll where its surface receives image-defining electrostatic charges deposited by one of three pulsed line scan styluses bearing directly and successively upon it. The styluses are secured to an endless belt moving at constant velocity laterally of the web. The pulse stream for each line is accurately initiated as a function of stylus position and clocked from a rapid access storage by pulses mechanically synchronized with the belt drive. The latent image charged web is progressively festooned until a full sheet of video data is recorded, following which the web is severed and an image toning and fixing cycle is initiated to produce a hard copy.
Inventors
- 👤 A Chertok
- 👤 D Shaler
- 👤 R Murray
- 👤 P Cone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:47
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/325; H; H04; H04N; H04N1/00; H04N1/04; H04N1/12; H04N1/14; H04N1/23; H04N1/29
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
173 words
A dielectric recorder having, in combination, a closed loop belt, drive means for the belt including means to form a writing portion of the path thereof, means to feed a sheet having a dielectric surface relatively to the belt in a direction transverse to said writing portion, an electrically conductive support directly contacting the side of said sheet opposite to said dielectric surface along a dimension of the sheet spaced uniformly from said writing portion, a plurality of stylus means secured to the belt in mutually spaced relationship, each adapted to bear independently and resiliently upon said dielectric surface opposite to said support while traversing the writing portion of said path, means to apply electrical pulses between each stylus and said support at positions spaced along said writing portion to produce a latent image of a line in the form of electrostatic charges on said surface, means to apply an oppositely charged toner to said surface, and means to fix said toner on the sheet to produce a hard copy of said image.
Claim 2
Dependent Claim
173 words
A dielectric recorder having, in combination, a closed loop belt, drive means for the belt including means to form a writing portion of the path thereof, means to feed a sheet having a dielectric surface relatively to the belt in a direction transverse to said writing portion, an electrically conductive support directly contacting the side of said sheet opposite to said dielectric surface along a dimension of the sheet spaced uniformly from said writing portion, a plurality of stylus means secured to the belt in mutually spaced relationship, each adapted to bear independently and resiliently upon said dielectric surface opposite to said support while traversing the writing portion of said path, means to apply electrical pulses between each stylus and said support at positions spaced along said writing portion to produce a latent image of a line in the form of electrostatic charges on said surface, means to apply an oppositely charged toner to said surface, and means to fix said toner on the sheet to produce a hard copy of said image.
Claim 3
Dependent Claim
24 words
A recorder as defined in claim 1 in which the means to apply electrical pulses is synchronized with the drive means for the belt.
Claim 4
Dependent Claim
99 words
A recorder as defined in claim 1 in which each stylus means includes a body attached to the belt, a stylus mounted on the body with provision for resiliently bearing on the sheet and an actuator operable to withdraw the stylus from contact with the sheet, and further including stationary ramps means adjacent an edge of the sheet to engage and operate the actuator of each stylus means to lift the stylus out of contact with the sheet as the stylus passes over the edge thereof and thereafter to allow the stylus to move into contact with the sheet.
Claim 5
Dependent Claim
16 words
A recorder as defined in claim 3 in which the last mentioned means include a cam.
Claim 6
Dependent Claim
49 words
A recorder as defined in claim 1 in which the means to apply electrical pulses include a digital memory for data representing said image and a pulse generator mechanically connected with the belt drive means and adapted to clock said data out of said memory to a stylus means.
Claim 7
Dependent Claim
21 words
A recorder as defined in claim 5 in which the digital memory has capacity for a full line of said image.
Claim 8
Dependent Claim
64 words
A recorder as defined in claim 1 in which the means to apply electrical pulses include a digital memory for data representing said image, a circuit having means enabling it to clock said data out of said memory to a stylus means, and synchronizing means in a predetermined position relative to said writing portion and cooperative with said stylus means to enable said circuit.
Claim 9
Dependent Claim
23 words
A recorder as defined in claim 7 in which said circuit clocks said data in synchronism with the drive means for the belt.
Claim 10
Dependent Claim
36 words
A recorder as defined in claim 8 in which the means to feed the sheet are adapted to advance it intermittently in discrete steps to space the line images produced by the stylus means in sequence.
Claim 11
Dependent Claim
24 words
A recorder as defined in claim 9 in which a plurality of steps occur during the production of the latent image for each line.
Claim 12
Dependent Claim
39 words
A recorder as defined in claim 1 in which each stylus means includes a body attached to the belt and a stylus moUnted on the body with provision for positional adjustment thereon and for resiliently bearing on the sheet.
Claim 13
Dependent Claim
66 words
A recorder as defined in claim 11 in which the means to apply electrical pulses include a digital memory for data representing said image, a circuit having means enabling it to clock said data out of said memory to a stylus means, and synchronizing means in a predetermined position relative to said writing portion and directly operative by a stylus moving therethrough to enable said circuit.
Claim 14
Dependent Claim
42 words
A recorder as defined in claim 12 in which the synchronizing means include a light source, a photocell and means defining a light path from said source to said photocell, said path being interrupted by each stylus passing through said predetermined position.
Claim 15
Dependent Claim
54 words
A recorder as defined in claim 1 in which the means to feed the sheet include means to accumulate a length thereof during the period of production thereon of the latent images for a plurality of lines, and means to feed said length after said period continuously through the toner applying and fixing means.
Claim 16
Dependent Claim
31 words
A recorder as defined in claim 14 in which the sheet is fed at a first speed during said accumulation and at a higher speed through the toner and fixing means.
Claim 17
Dependent Claim
26 words
A recorder as defined in claim 14 further including means situated between said writing portion and the accumulated length of the sheet for severing the same.
Claim 18
Dependent Claim
46 words
A recorder as defined in claim 16 in which the sheet is in web form and is severed transversely of the web, said means to feed the sheet being adapted to arrest a severed end thereof between the accumulated length thereof and the toner applying means.
Claim 19
Dependent Claim
35 words
A recorder as defined in claim 17 in which said means to feed the sheet are operated by detecting the arrival of said severed end at a predetermined position to cause it to be arrested.
Claim 20
Dependent Claim
104 words
A recorder as defined in claim 17 in which said means to feed the sheet are operated by detecting the arrival of a leading severed end at a predetermined position to cause said end to be arrested and to cause the accumlating length to feed past said writing portion at a first speed, to be further operated upon actuation of the severing means to cause the accumlated length to feed through the toner and fixing means at a higher speed, and to be further operated by detecting the arrival of the trailing severed end at said predetermined position, to return to said first speed.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |