Patent US3620344A successfully refreshed from Google Patents.
US3620344A
Expired / Lapsed
US
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Selection system for a dual-element typewriter
Assignee: International Business Machines Corp
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Filing: 1969-12-29
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Granted: 1971-11-16
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Expires: 1989-12-29
Abstract
Abstract A dual-element typewriter mounts the print elements a fixed distance apart with a carrier support system and operates each element from a single keyboard and selection system. A control is positionable to select the desired element. Each element is connected to opposite ends of a flexible strand and pulley system for rotating and tilting the elements to position the selected character at the print point. The control operates to prevent the rotation and tilting of one element so that the strand and pulley system moves only the element carrying the selected character to bring that character to the print point.
Inventors
- 👤 Douglas E Clancy
- 👤 Jerome B O'daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:59
CPC Classifications
B; B41; B41J; B41J7/00; B41J7/54; B41J7/56; B41J7/64; B41J3/00; B41J3/54
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
289 words
In a typewriter including a keyboard, keylevers, a selection system, a printing mechanism, and a pair of type elements operatively connected thereto, each element being mounted for rotation and tilting about a center point and having a plurality of characters arranged thereon, an apparatus for selectively causing either one of the other of said elements to respond to said selection system and said printing mechanism said apparatus comprising: 1. a first flexible strand having its opposite ends connected to support means for rotating each head, 2. means connected to said selection system for varying the length of said first strand according to the keylever selected, 3. a second flexible strand having its opposite ends connected to support means for tilting each head, 4. means connected to said selection system for varying the length of said second strand according to the keylever selected, and 5. control means positionable to select either one or the other of said elements for response, said control means including: a. locking means moveable to prevent the rotation and tilting of the element not selected for response and thereby fix the ends of said strands connected to the means for rotating and the means for tilting the element not selected for response and at the same time moveable to permit the rotation and tilting of the element selected for response caused by the movement of the ends of said strands connected to the means for rotating and the means for tilting the element selected according to the change in lengths of said strands, and b. means moveable to connect the element selected for response to said printing mechanism and at the same time moveable to disconnect the element not selected for response from said printing mechanism.
Claim 2
Dependent Claim
289 words
In a typewriter including a keyboard, keylevers, a selection system, a printing mechanism, and a pair of type elements operatively connected thereto, each element being mounted for rotation and tilting about a center point and having a plurality of characters arranged thereon, an apparatus for selectively causing either one of the other of said elements to respond to said selection system and said printing mechanism said apparatus comprising: 1. a first flexible strand having its opposite ends connected to support means for rotating each head, 2. means connected to said selection system for varying the length of said first strand according to the keylever selected, 3. a second flexible strand having its opposite ends connected to support means for tilting each head, 4. means connected to said selection system for varying the length of said second strand according to the keylever selected, and 5. control means positionable to select either one or the other of said elements for response, said control means including: a. locking means moveable to prevent the rotation and tilting of the element not selected for response and thereby fix the ends of said strands connected to the means for rotating and the means for tilting the element not selected for response and at the same time moveable to permit the rotation and tilting of the element selected for response caused by the movement of the ends of said strands connected to the means for rotating and the means for tilting the element selected according to the change in lengths of said strands, and b. means moveable to connect the element selected for response to said printing mechanism and at the same time moveable to disconnect the element not selected for response from said printing mechanism.
Claim 3
Dependent Claim
57 words
The apparatus of claim 1 wherein said locking means comprises a pair of pins alternately moveable into engagement with a pair of detent plates fixed to said support means for rotating each head and a pair of detent plates alternately moveable into engagement with a pair of pins fixed to said support means for tilting each head.
Claim 4
Dependent Claim
19 words
means connected to said selection system for varying the length of said first strand according to the keylever selected,
Claim 5
Dependent Claim
19 words
means connected to said selection system for varying the length of said first strand according to the keylever selected,
Claim 6
Dependent Claim
16 words
a second flexible strand having its opposite ends connected to support means for tilting each head,
Claim 7
Dependent Claim
16 words
a second flexible strand having its opposite ends connected to support means for tilting each head,
Claim 8
Dependent Claim
52 words
The apparatus of claim 1 wherein said control means includes a bistable code bar which engages the cycle clutch and prevents movement of said control when said clutch is not in the home position and which prevents operation of said cycle clutch when said code bar is not in a bistable position.
Claim 9
Dependent Claim
31 words
The apparatus of claim 3 wherein said bistable code bar engages the shift bar and prevents movement of said shift bar when said code bar is not in a bistable position.
Claim 10
Dependent Claim
20 words
means connected to said selection system for varying the length of said second strand according to the keylever selected, and
Claim 11
Dependent Claim
20 words
means connected to said selection system for varying the length of said second strand according to the keylever selected, and
Claim 12
Dependent Claim
145 words
control means positionable to select either one or the other of said elements for response, said control means including: a. locking means moveable to prevent the rotation and tilting of the element not selected for response and thereby fix the ends of said strands connected to the means for rotating and the means for tilting the element not selected for response and at the same time moveable to permit the rotation and tilting of the element selected for response caused by the movement of the ends of said strands connected to the means for rotating and the means for tilting the element selected according to the change in lengths of said strands, and b. means moveable to connect the element selected for response to said printing mechanism and at the same time moveable to disconnect the element not selected for response from said printing mechanism.
Claim 13
Dependent Claim
145 words
control means positionable to select either one or the other of said elements for response, said control means including: a. locking means moveable to prevent the rotation and tilting of the element not selected for response and thereby fix the ends of said strands connected to the means for rotating and the means for tilting the element not selected for response and at the same time moveable to permit the rotation and tilting of the element selected for response caused by the movement of the ends of said strands connected to the means for rotating and the means for tilting the element selected according to the change in lengths of said strands, and b. means moveable to connect the element selected for response to said printing mechanism and at the same time moveable to disconnect the element not selected for response from said printing mechanism.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |