US3598220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon-lifting mechanism for a typewriter
Assignee: TRIUMPH-ADLER AG A CORP OF GERMANY
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Filing: 1969-03-19
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Granted: 1971-08-10
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Expires: 1989-03-19
Abstract
Abstract A ribbon-lifting mechanism for a typewriter comprising a toggle mechanism the common ends of whose links are pivotally mounted on a drive arm, the other end of one link is fulcrumed on a bistable shiftable support, and the other end of the other link is pivotally connected to a ribbon lift crank. The drive arm is operable on each forward stroke to open or straighten and on each rearward stroke to close or break the toggle about its fulcrum. A bistable trip lever also pivotally mounted on the drive arm is conditioned on each forward stroke of the drive arm to shift the position of the bistable support on each rearward stroke of the drive arm, and as a result of the shifting movement of the bistable support a ribbon vibrator connected to the toggle mechanism is elevated alternately through full and partial strokes on succeeding forward strokes of the drive arm whereby in combination with ribbon movement a zigzag pattern is defined on a carbon ribbon to utilize the maximum area of the carbon ribbon.
Inventors
- 👤 Robert E Mcgrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:04
CPC Classifications
B; B41; B41J; B41J35/00; B41J35/22; B41J35/23; B41J35/04; B41J35/10; B41J35/12; B41J35/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
419 words
A ribbon-lifting mechanism comprising, a frame, vibrator-elevating means pivotally supported on said frame, a ribbon vibrator mounted on said vibrator-eleVating means, a toggle mechanism including a first link having a first end pivotally joined to said vibrator-elevating means and a second link having a first end pivotally connected to a second end of said first link and forming therewith a toggle linkage, bistably shiftable support means, means on said bistably positionable support means carrying said second link pivotally at a second end thereof, drive means connected to said toggle joint, operative in an actuating stroke to straighten the toggle mechanism and operative in a return stroke to fold said toggle mechanism, automatic means operable in response to each return stroke of said drive means to shift the position of said bistably shiftable support means, whereby said ribbon vibrator is elevated alternately to one and another positions incidental to alternate actuating strokes of said drive means, said bistably shiftable support means including a pivotally mounted shifting plate movable in one direction from one position to a second position and movable in a counterdirection from said second position to said first position, bias means connected to said shifting plate for alternately biasing said shifting plate to each of said positions after a partial movement thereto, said automatic means including a two-armed, pivotally mounted bistable trip lever on said drive means, said trip lever in one bistable position on said drive means being capable in return stroke of said drive means to engage one portion of said pivotally mounted shifting plate to move it pivotally from said first to said second position and being capable in another bistable position to engage another portion of said shifting plate to move it pivotally from said second to said first position, means cooperative between said drive means and said bistable trip lever to provide limits of pivotal movements for said trip lever, an overcenter spring oppositely connected to said trip lever and said drive means for biasing said trip lever bistably to each of said pivotal limits after partial movements thereto, a frame-supported projection in the path of one of said arms of said trip lever effective in successive alternate actuating strokes of said drive means to position said trip lever in one of its bistable positions, and a frame-supported other projection in the path of the other of said arms of said trip lever effective in the other actuating strokes of said drive means to position said trip lever in its other bistable position.
Claim 2
Dependent Claim
419 words
A ribbon-lifting mechanism comprising, a frame, vibrator-elevating means pivotally supported on said frame, a ribbon vibrator mounted on said vibrator-eleVating means, a toggle mechanism including a first link having a first end pivotally joined to said vibrator-elevating means and a second link having a first end pivotally connected to a second end of said first link and forming therewith a toggle linkage, bistably shiftable support means, means on said bistably positionable support means carrying said second link pivotally at a second end thereof, drive means connected to said toggle joint, operative in an actuating stroke to straighten the toggle mechanism and operative in a return stroke to fold said toggle mechanism, automatic means operable in response to each return stroke of said drive means to shift the position of said bistably shiftable support means, whereby said ribbon vibrator is elevated alternately to one and another positions incidental to alternate actuating strokes of said drive means, said bistably shiftable support means including a pivotally mounted shifting plate movable in one direction from one position to a second position and movable in a counterdirection from said second position to said first position, bias means connected to said shifting plate for alternately biasing said shifting plate to each of said positions after a partial movement thereto, said automatic means including a two-armed, pivotally mounted bistable trip lever on said drive means, said trip lever in one bistable position on said drive means being capable in return stroke of said drive means to engage one portion of said pivotally mounted shifting plate to move it pivotally from said first to said second position and being capable in another bistable position to engage another portion of said shifting plate to move it pivotally from said second to said first position, means cooperative between said drive means and said bistable trip lever to provide limits of pivotal movements for said trip lever, an overcenter spring oppositely connected to said trip lever and said drive means for biasing said trip lever bistably to each of said pivotal limits after partial movements thereto, a frame-supported projection in the path of one of said arms of said trip lever effective in successive alternate actuating strokes of said drive means to position said trip lever in one of its bistable positions, and a frame-supported other projection in the path of the other of said arms of said trip lever effective in the other actuating strokes of said drive means to position said trip lever in its other bistable position.
Claim 3
Dependent Claim
313 words
In a machine having a selective typing mechanism operable to effect character imprints at a typing line, a ribbon vibrator for projecting a ribbon from a retired position to either one of two positions over a printing line, an element connected with said vibrator to operate it, a mechanism responsive to the selective operation and restoration of said typing mechanism to effect respectively an operating and a restoring movement of said element and connected vibrator and comprising, a normally folded toggle linkage having a first link and a second link, a pivotal joint between said links, a pivotal joint connecting said element with said first link at a location spaced from the pivotal joint which connects it with said second link, a means bistably positionable in one or another position for pivotally supporting said second toggle link in one or another basic pivot location at the link end thereof which is opposite to where it has a pivotal joint with said first toggle link, and means respectively responsive to each selective operation of said typing mechanism followed by a restoration thereof, to impart respectively a straightening movement and a folding movement to said toggle, and means operatively associated with said responsive means to effect in connection with each consecutive toggle-folding movement a movement of said bistably positionable supporting means from the bistable position it has occupied to its other bistable Position, said responsive means including a drive link to impart to said toggle linkage in conjunction with each selective operation and restoration of the typing mechanism a toggle straightening stroke followed reversely by a toggle-folding stroke, said responsive means including means conditionable in response to each toggle-straightening stroke of said drive link, so that said bistably positionable means in dependency of its then prevalent bistable position will in the following toggle-folding stroke of said drive link become operated to the other bistable position.
Claim 4
Dependent Claim
313 words
In a machine having a selective typing mechanism operable to effect character imprints at a typing line, a ribbon vibrator for projecting a ribbon from a retired position to either one of two positions over a printing line, an element connected with said vibrator to operate it, a mechanism responsive to the selective operation and restoration of said typing mechanism to effect respectively an operating and a restoring movement of said element and connected vibrator and comprising, a normally folded toggle linkage having a first link and a second link, a pivotal joint between said links, a pivotal joint connecting said element with said first link at a location spaced from the pivotal joint which connects it with said second link, a means bistably positionable in one or another position for pivotally supporting said second toggle link in one or another basic pivot location at the link end thereof which is opposite to where it has a pivotal joint with said first toggle link, and means respectively responsive to each selective operation of said typing mechanism followed by a restoration thereof, to impart respectively a straightening movement and a folding movement to said toggle, and means operatively associated with said responsive means to effect in connection with each consecutive toggle-folding movement a movement of said bistably positionable supporting means from the bistable position it has occupied to its other bistable Position, said responsive means including a drive link to impart to said toggle linkage in conjunction with each selective operation and restoration of the typing mechanism a toggle straightening stroke followed reversely by a toggle-folding stroke, said responsive means including means conditionable in response to each toggle-straightening stroke of said drive link, so that said bistably positionable means in dependency of its then prevalent bistable position will in the following toggle-folding stroke of said drive link become operated to the other bistable position.
Claim 5
Dependent Claim
125 words
The invention defined in claim 2, said drive link being pivotally jointed with said toggle linkage so that said drive link in its toggle-straightening stroke moves in the direction of the straightening action of the toggle linkage to either one of two positions dependent on the prevalent basic pivot location said bistably positionable means then affords to the second toggle link, and a trip means carried on said drive link and controllable thereby during the conclusion of its toggle-straightening stroke, due to the position to which said drive link moves in the direction of the straightening action of the toggle linkage, to become potent in the toggle-folding return stroke of said drive link to act on said bistably positionable means to reverse its bistable position.
Claim 6
Dependent Claim
99 words
The invention defined in claim 3, two frame-supported abutments, said trip means being a two-armed bistable member pivotally carried on said drive link, and the arms of said two-armed member during alternate toggle straightening strokes of said drive link being adapted to engage alternately one or the other of said abutments to cause opposite rocking movements of said two-armed bistable member, said two-armed bistable member, due to being alternately rocked in the toggle straightening strokes of said drive link, being effective in the toggle folding return strokes to act on said bistably positionable means to reverse its bistable position.
Claim 7
Dependent Claim
238 words
In a machine having a selective typing mechanism operable to effect character imprints at a typing line, a ribbon vibrator for projecting a ribbon from a retired position to either one of two positions over a printing line, an element connected with said vibrator to operate it, a mechanism responsive to the selective operation and restoration of said typing mechanism to effect respectively an operating and a restoring movement of said element and connected vibrator and comprising, a normally folded toggle linkage having a first link and a second link, a pivotal joint between said links, a pivotal joint connecting said element with said first link at a location spaced from the pivotal joint which connects it with said second link, a means bistably positionable in one or another position for pivotally supporting said second toggle link in one or another basic pivot location at the link end thereof which is opposite to where it has a pivotal joint with said first toggle link, and means respectively responsive to each selective operation and restoration of said typing mechanism, to impart to said toggle respectively a straightening movement and a folding movement, and means operatively associated with said responsive means to effect in consequence of each consecutive toggle folding movement following a toggle straightening movement, a movement of said bistably positionable supporting means from the particular bistable position it has occupied to the other one of its bistable position.
Claim 8
Dependent Claim
238 words
In a machine having a selective typing mechanism operable to effect character imprints at a typing line, a ribbon vibrator for projecting a ribbon from a retired position to either one of two positions over a printing line, an element connected with said vibrator to operate it, a mechanism responsive to the selective operation and restoration of said typing mechanism to effect respectively an operating and a restoring movement of said element and connected vibrator and comprising, a normally folded toggle linkage having a first link and a second link, a pivotal joint between said links, a pivotal joint connecting said element with said first link at a location spaced from the pivotal joint which connects it with said second link, a means bistably positionable in one or another position for pivotally supporting said second toggle link in one or another basic pivot location at the link end thereof which is opposite to where it has a pivotal joint with said first toggle link, and means respectively responsive to each selective operation and restoration of said typing mechanism, to impart to said toggle respectively a straightening movement and a folding movement, and means operatively associated with said responsive means to effect in consequence of each consecutive toggle folding movement following a toggle straightening movement, a movement of said bistably positionable supporting means from the particular bistable position it has occupied to the other one of its bistable position.
Claim 9
Dependent Claim
58 words
The invention defined in claim 5, said responsive means effecting during the restoration of said typing mechanism each time a forced partial movement of said bistably positionable means from whichever of said two positions it has occupied toward the other position, and spring means cooperative with said bistably positionable means to complete each of its said started movements.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |