US3896451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording apparatus with automatic movement of the recording electrodes between a recording and a nonrecording position
Assignee: Ricoh Co Ltd
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Filing: 1973-03-23
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Granted: 1975-07-22
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Expires: 1993-03-23
Abstract
Abstract In an electrostatic recording apparatus, the recording electrode and the back electrode are pressed against each other across a sheet of moving recording paper, to ensure effective recording, but move away from each other just before the sheet moves away from the electrodes, to avoid an electrical short. This has the advantages of efficient recording, which have been previously possible only with recording on a continuous web, and the advantages of efficient use of paper, which have been associated previously only with spaced-apart electrodes recording on individual sheets of paper.
Inventors
- 👤 Kyoji Omi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:27
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/325; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
261 words
An electrostatic recording apparatus comprising means for moving a recording sheet along a defined path, recording electrode means disposed at the other side of the path, means for supporting the electrode means, means for detecting the presence of a recording sheet at a defined portion of said path to provide control signals in response to detecting the presence of a sheet at said defined portion of the path, means responsive to the said control signals from the detecting means for causing the support means to maintain the two electrode means at a recording position adjacent and facing each other across said path when a sheet is present at said defined portion of the path and to maintain the two electrode means at a nonrecording position away from each other when no sheet is present at said defined portion of the path and to move the electrode means between said two positions, said defined portion of the path including the path portion which is between the two electrode means when the electrode means are at their recording position, wherein the detecting means comprises first sensor means disposed in the path of the recording sheet preceding at least one of the electrode means and second sensor means disposed in the path of the recording sheet after at least one of the electrode means, as seen in the direction of movement of the recording sheet along said path, each of said sensor means being actuated by the presence of a recording sheet at its location, said sensor means providing said control signals when actuated.
Claim 2
Dependent Claim
261 words
An electrostatic recording apparatus comprising means for moving a recording sheet along a defined path, recording electrode means disposed at the other side of the path, means for supporting the electrode means, means for detecting the presence of a recording sheet at a defined portion of said path to provide control signals in response to detecting the presence of a sheet at said defined portion of the path, means responsive to the said control signals from the detecting means for causing the support means to maintain the two electrode means at a recording position adjacent and facing each other across said path when a sheet is present at said defined portion of the path and to maintain the two electrode means at a nonrecording position away from each other when no sheet is present at said defined portion of the path and to move the electrode means between said two positions, said defined portion of the path including the path portion which is between the two electrode means when the electrode means are at their recording position, wherein the detecting means comprises first sensor means disposed in the path of the recording sheet preceding at least one of the electrode means and second sensor means disposed in the path of the recording sheet after at least one of the electrode means, as seen in the direction of movement of the recording sheet along said path, each of said sensor means being actuated by the presence of a recording sheet at its location, said sensor means providing said control signals when actuated.
Claim 3
Dependent Claim
59 words
An electrostatic recording apparatus as in claim 1 wherein the supporting means comprises a frame carrying one of said electrode means and means for pivotally supporting the frame for movement between a recording position in which the two electrode means are at their recording position and a nonrecording position which the two electrode means are at their nonrecording position.
Claim 4
Dependent Claim
16 words
An electrOstatic recording apparatus as in claim 2 wherein said frame carries the back electrode means.
Claim 5
Dependent Claim
89 words
An electrostatic recording apparatus as in claim 3 wherein the means for moving the recording sheet comprises a first and a second pair of feed rollers, with the first pair disposed before the electrode means and the second pair disposed after the electrode means as seen in the direction of movement of the recording sheet, each of said pair comprising a lower and an upper roller, with the upper roller of each pair secured to said frame and movable therewith between the recording and nonrecording position of the frame.
Claim 6
Dependent Claim
127 words
An electrostatic recording apparatus as in claim 1 wherein the support means and the means for causing the support means to maintain the electrode means in said recording and nonrecording position comprise a lever, means for pivotally supporting the lever for movement between a recording position at which the two electrode means are at their recording position and a nonrecording position at which the two electrode means are at their non-recording position, said lever engaging the support means for at least one of the electrode means, and electric circuit means responsive to the actuation of both switches to cause the lever to move to its recording position and responsive to the lack of actuation of either switch to cause the lever to move to its nonrecording position.
Claim 7
Dependent Claim
17 words
An electrostatic recording apparatus as in claim 5 wherein the lever engages the back electrode means only.
Claim 8
Dependent Claim
70 words
An electrostatic recording apparatus as in claim 6 wherein the electrical circuit means comprises a relay actuated when both the first and the second switch are actuated, a solenoid energized when the relay is actuated, and means responsive to the energized state of the solenoid to move the lever to its recording position and responsive to the nonenergized state of the solenoid to move the lever to its nonrecording position.
Claim 9
Dependent Claim
19 words
An electrostatic recording apparatus as in claim 7 including means for normally biasing the lever to its nonrecording position.
Claim 10
Dependent Claim
231 words
An electrostatic recording apparatus comprising: means for moving a recording sheet along a defined path; recording electrode means disposed at one side of the path, and back electrode means disposed at the other side of the path; means for supporting the electrode means for motion toward and away from each other, between a recording position at which the electrode means are close to each other and a nonrecording position at which the electrode means are further away from each other; means for detecting the presence of a continuous length of a recording sheet within a continuous span of said path, which span has a portion before and a portion after the electrode means, as seen in the direction of movement of the sheet along the path, to provide first type control signals in response thereto, and for detecting the absence of a sheet at any portion of said span to provide second type control signals; means for moving the electrode means to said recording position in response to said first type control signals and for maintaining the electrode means at said recording position until the detecting means provide said second type control signals, and for moving the electrode means to said nonrecording position in response to said second type control signals and for maintaining the electrode means at said nonrecording position until the detecting means provide said first type control signals.
Claim 11
Dependent Claim
231 words
An electrostatic recording apparatus comprising: means for moving a recording sheet along a defined path; recording electrode means disposed at one side of the path, and back electrode means disposed at the other side of the path; means for supporting the electrode means for motion toward and away from each other, between a recording position at which the electrode means are close to each other and a nonrecording position at which the electrode means are further away from each other; means for detecting the presence of a continuous length of a recording sheet within a continuous span of said path, which span has a portion before and a portion after the electrode means, as seen in the direction of movement of the sheet along the path, to provide first type control signals in response thereto, and for detecting the absence of a sheet at any portion of said span to provide second type control signals; means for moving the electrode means to said recording position in response to said first type control signals and for maintaining the electrode means at said recording position until the detecting means provide said second type control signals, and for moving the electrode means to said nonrecording position in response to said second type control signals and for maintaining the electrode means at said nonrecording position until the detecting means provide said first type control signals.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |