US3873014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet intermittent feed device
Assignee: Ricoh Co Ltd
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Filing: 1973-07-02
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Granted: 1975-03-25
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Expires: 1993-07-02
Abstract
Abstract A device comprising at least one electromagnet and a sheet feed member made of a ferromagnetic material disposed in spaced juxtaposed relationship across a path of movement of a sheet. The electromagnet is intermittently excited so that the sheet feed member intermittently moves relative to the electromagnet or the electromagnet intermittently moves relative to the sheet feed member whereby the sheet can be intermittently fed along its path of movement.
Inventors
- 👤 Koh Matsuhisa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:00
CPC Classifications
G; G06; G06K; G06K13/00; G06K13/02; G06K13/07; G06K13/077; B; B65; B65H; B65H5/00; B65H5/08; B65H5/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
305 words
A sheet intermittent feed device comprising: a. means for defining a path of movement of sheet material having two opposed major surfaces, including means for engaging one of the two major surfaces of the sheet material during advance thereof along said path; b. a first member, for pressing said sheet material against said engaging means, reciprocable between first and second positions spaced a predetermined distance apart along said path, in engagement with the other of the two major surfaces of the sheet material, and sufficiently displaceable transversely of said path to vary the pressure exerted by said first member on sheet material in the path; c. means for returning said first member for movement toward said first posiTion; and d. a second member fixedly disposed on one side of said path, and closer to said second position than to said first position, in facing relation to said one major surface of sheet material in the path such that the path extends between said first and second members; e. one of said first and second members being intermittently energizable to constitute an electromagnet; f. the other of said members being made of a magnetic material attractable by said electromagnet; g. the sphere of influence of said electromagnet embracing said second member and said first and second positions of said first member, such that energization of said electromagnet causes said first member to move from said first position to said second position while being pressed against sheet material in the path by magnetic attraction to said electromagnet, thereby advancing the sheet material along the path for said predetermined distance by frictional pressing engagement of the first member therewith, and de-energization of said electromagnet releases said first member for return by said returning means to said first position in reduced-pressure sliding relation to sheet material in the path.
Claim 2
Dependent Claim
305 words
A sheet intermittent feed device comprising: a. means for defining a path of movement of sheet material having two opposed major surfaces, including means for engaging one of the two major surfaces of the sheet material during advance thereof along said path; b. a first member, for pressing said sheet material against said engaging means, reciprocable between first and second positions spaced a predetermined distance apart along said path, in engagement with the other of the two major surfaces of the sheet material, and sufficiently displaceable transversely of said path to vary the pressure exerted by said first member on sheet material in the path; c. means for returning said first member for movement toward said first posiTion; and d. a second member fixedly disposed on one side of said path, and closer to said second position than to said first position, in facing relation to said one major surface of sheet material in the path such that the path extends between said first and second members; e. one of said first and second members being intermittently energizable to constitute an electromagnet; f. the other of said members being made of a magnetic material attractable by said electromagnet; g. the sphere of influence of said electromagnet embracing said second member and said first and second positions of said first member, such that energization of said electromagnet causes said first member to move from said first position to said second position while being pressed against sheet material in the path by magnetic attraction to said electromagnet, thereby advancing the sheet material along the path for said predetermined distance by frictional pressing engagement of the first member therewith, and de-energization of said electromagnet releases said first member for return by said returning means to said first position in reduced-pressure sliding relation to sheet material in the path.
Claim 3
Dependent Claim
31 words
A device as defined in claim 1, wherein said returning means comprises means acting on said first member for resiliently biasing said first member toward said first position along said path.
Claim 4
Dependent Claim
54 words
A device as defined in claim 2, wherein said biasing means comprises an element fixed relative to said path, and a spring acting between said first member and said fixed element, and further including stop means for arresting movement of said first member, under the force of said biasing means, at said first position.
Claim 5
Dependent Claim
115 words
A device as defined in claim 3, wherein said second member comprises an electromagnet having two poles facing and spaced along said path; wherein said first member comprises a ferromagnetic member having two openings respectively positioned for register with said two poles when said first member is in said first position, and two solid portions respectively positioned on the sides of said two openings toward said first position; and further including a fixed plate extending over the path of movement of said first member; said fixed element being secured to said plate, and said stop comprising a portion of said plate projecting into the path of movement of said first member at said first position.
Claim 6
Dependent Claim
14 words
A device as defined in claim 1, wherein said second member comprises an electromagnet.
Claim 7
Dependent Claim
49 words
A device as defined in claim 5, wherein said returning means comprises a second electromagnet disposed adjacent said first position on the same side of the path as said first member and energizable for return of said first member to said first position upon de-energization of said second member.
Claim 8
Dependent Claim
62 words
A device as defined in claim 1, further including brake means disposed adjacent said path beyond said second position, said brake means comprising an electromagnetic element and a ferromagnetic element positioned on opposite sides of said path, one of the last-mentioned elements being movable toward the other upon energization of said electromagnetic element, for pressing and arresting sheet material in the path.
Claim 9
Dependent Claim
28 words
A device as defined in claim 1, wherein said path-defining means comprises plural supports spaced along the path for engaging said one major surface of sheet material therein.
Claim 10
Dependent Claim
23 words
A device as defined in claim 1, wherein said path-defining means comprises a nonmagnetic plate interposed between said second member and said path.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |