US4059213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutchless paper advance mechanism
Assignee: HP Inc
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Filing: 1976-06-07
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Granted: 1977-11-22
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Expires: 1996-06-07
Abstract
Abstract The paper advance mechanism disclosed herein comprises two essentially identical paper-engaging devices, one fixed, one driven, which cooperate to incrementally advance the paper in a hand-held printing calculator. Each device includes a tapered cavity enclosing a roller which engages the paper as it passes therethrough. The position of the roller in the cavity determines whether that device slidably or non-slidably engages the paper and the position of the roller is determined by the movement of the paper itself. The paper-engaging devices alternately non-slidably engage the paper; when the driven device moves in one direction, it non-slidably engages and thus advances the paper as it moves, and the paper slides through the fixed device; when the driven device reverses direction, it slidably engages the paper as it returns to the start of its travel and the fixed device non-slidably engages the paper to hold the advanced paper in position.
Inventors
- 👤 Timothy L. Toomay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:29
CPC Classifications
B; B65; B65H; B65H20/00; B65H20/16; B65H20/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
Apparatus for advancing paper along a guide path, said apparatus comprising: first paper-engaging means, non-rotatably mounted for translation along the guide path including a roller, said roller being responsive to movement of the means in a first direction relative to the paper for non-slidably gripping the paper and for advancing the paper in the first direction, and to movement of the means in a second direction relative to the paper for rollably engaging the paper; drive means coupled to the first paper-engaging device for moving that device in the first and second directions; and second paper-engaging means non-rotatably and fixedly mounted in the guide path and including a roller, said roller being responsive to movement of the paper in the first direction for rollably engaging the paper, and to movement of the paper in the second direction for non-slidably gripping the paper and for preventing movement of the paper in the second direction when the first paper-engaging means is moving in that direction; said second paper-engaging means including means for releasing its non-slidable grip with the paper when the force tending to cause the paper to move in the second direction exceeds a first value.
Claim 2
Dependent Claim
195 words
Apparatus for advancing paper along a guide path, said apparatus comprising: first paper-engaging means, non-rotatably mounted for translation along the guide path including a roller, said roller being responsive to movement of the means in a first direction relative to the paper for non-slidably gripping the paper and for advancing the paper in the first direction, and to movement of the means in a second direction relative to the paper for rollably engaging the paper; drive means coupled to the first paper-engaging device for moving that device in the first and second directions; and second paper-engaging means non-rotatably and fixedly mounted in the guide path and including a roller, said roller being responsive to movement of the paper in the first direction for rollably engaging the paper, and to movement of the paper in the second direction for non-slidably gripping the paper and for preventing movement of the paper in the second direction when the first paper-engaging means is moving in that direction; said second paper-engaging means including means for releasing its non-slidable grip with the paper when the force tending to cause the paper to move in the second direction exceeds a first value.
Claim 3
Dependent Claim
96 words
An apparatus as in claim 1 wherein: the roller is housed in a cavity having wide and narrow portions and deflecting means for urging the roller into the narrow portion of the cavity, said paper being in substantially constant engagement with the roller when passing through the cavity; and said roller is effective for non-slidably gripping the paper in response to the relative movement of the paper toward the narrow portion of the cavity and for rollably engaging the paper in response to the relative movement of the paper toward the wide portion of the cavity.
Claim 4
Dependent Claim
66 words
An apparatus as in claim 1 wherein: the first paper-engaging means is effective for advancing the paper along the guide path in the first direction by frictional engagement of the roller therewith; the second paper-engaging means is effective for preventing movement of the paper in the guide path by frictional engagement of the roller therewith when the first paper-engaging means is moving in the second direction.
Claim 5
Dependent Claim
20 words
An apparatus as in claim 1 wherein the first value is less than the force required to tear the paper.
Claim 6
Dependent Claim
55 words
An apparatus as in claim 1 wherein the means for releasing the non-slidable grip of the first and second paper-engaging means is effective for releasing the non-slidable grip of the roller with the paper when the force causing the relative movement of the roller toward the narrow end of the cavity exceeds a first value.
Claim 7
Dependent Claim
83 words
An apparatus as in claim 1 wherein: the first and second paper-engaging means each include a retainer and a receiver; and the means for releasing the first and second paper-engaging means non-slidable grip of the paper are sets of clamps for holding the retainer and receiver of each paper-engaging means together, said clamps yielding to allow partial separation of the retainer and receiver when the force causing non-slidable gripping of the paper by the rollers in the paper-engaging means exceeds the first value.
Claim 8
Dependent Claim
42 words
An apparatus as in claim 6 wherein the drive means is coupled to the first paper-engaging means at points corresponding to both ends of the roller so that the axis of the roller is perpendicular to its movement relative to the paper.
Claim 9
Dependent Claim
42 words
An apparatus as in claim 1 wherein said drive means further includes orientation means for maintaining the orientation of the first paper-engaging means parallel to the orientation of the second paper-engaging means in the guide path while moving in the first direction.
Claim 10
Dependent Claim
16 words
An apparatus as in claim 8 wherein said orientation means is a rack and pinion gear.
Claim 11
Dependent Claim
36 words
An apparatus as in claim 8 wherein said orientation means maintains orientation of the first paper-engaging means parallel to the orientation of the second paper-engaging means in the guide path while moving in the second direction.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |