US3838762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Type action arrangement
Assignee: TRIUMPH-ADLER AG A CORP OF GERMANY
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Filing: 1973-02-16
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Granted: 1974-10-01
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Expires: 1993-02-16
Abstract
Abstract The keylevers, trip levers and sublevers of a powered type action arrangement are pivotally supported on common pivot rods and mounted in a single mounting bracket with the keylevers biased to a rest position by springs urging the trip levers against the keylevers. The normal rest position of the keylevers and keylever movement necessary to initiate printing are determined by a stop member limiting the movement of the trip levers, and the stop member has a cam-shaped cross-sectional configuration and is rotatable so as to vary the distance of keylever movement necessary to effect printing. The keylever depression is resisted by leaf springs secured to the mounting bracket for engagement by the trip levers, and the resisting pressure may be varied by a pressure adjusting mechanism for moving the leaf springs relative to the trip levers. Each depression of a keylever pivots the associated trip lever to move a cam carried on the associated sublever into engagement with a rotating power roll for driving the corresponding type bar in a printing movement. The engagement of the cams with the power roll is limited by a stop member which is part of an impression control mechanism, and the position of the stop member may be adjusted to uniformly vary the impact intensity of all the type bars. After a cam is disengaged from the power roll, the momentum imparted to the type bar continues its printing movement toward the platen against the urging of a return spring connected to the sublever for returning it to a rest position. The impact intensity of each type bar may be individually varied by controlling the tension of the return spring, and the mounting bracket has a plate with a plurality of holes associated with each type action for enabling the return spring to be stretched to different distances. To prevent the type bars from undergoing a printing movement when a carriage supporting the platen is in a left margin position, a bail is pivoted into blocking relation with the cams for restricting engagement with the power roll.
Inventors
- 👤 T Madison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:52
CPC Classifications
B; B41; B41J; B41J23/00; B41J23/02; B41J23/12; B41J7/00; B41J7/92; B41J7/94
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
239 words
In a powered typewriter having a plurality of type actions each including a sublever movable from a rest position to a print position to effect a printing movement of a type bar, a cam pivotally supported on the sublever and movable into engagement with a power roll to drive the sublever from the rest position to the print position, a trip lever movable to pivot the cam into engagement with the power roll, and a keylever for moving the trip lever to initiate a printing operation, the improvement comprising: a first pivot rod for pivotally supporting said plurality of sublevers; a second pivot rod for pivotally supporting said plurality of trip levers; a third pivot rod for pivotally supporting said plurality of keylevers; a mounting bracket for mounting said sublevers, said trip levers and said keylevers in operative relation relative to each other; said mounting bracket including spaced-apart end plate means having first, second and third holes formed therein for receiving said first, second and third pivot rods respectively in aligned relation to each other; said mounting bracket further including wall means extending between said pair of end plates and having guide slots formed therein for receiving therethrough and operably aligning said sublevers, said trip levers and said keylevers; and said end plates and said wall means defining complementary tabs and tab receiving slots for positioning and securing said end plates and said wall means relative to each other.
Claim 2
Dependent Claim
239 words
In a powered typewriter having a plurality of type actions each including a sublever movable from a rest position to a print position to effect a printing movement of a type bar, a cam pivotally supported on the sublever and movable into engagement with a power roll to drive the sublever from the rest position to the print position, a trip lever movable to pivot the cam into engagement with the power roll, and a keylever for moving the trip lever to initiate a printing operation, the improvement comprising: a first pivot rod for pivotally supporting said plurality of sublevers; a second pivot rod for pivotally supporting said plurality of trip levers; a third pivot rod for pivotally supporting said plurality of keylevers; a mounting bracket for mounting said sublevers, said trip levers and said keylevers in operative relation relative to each other; said mounting bracket including spaced-apart end plate means having first, second and third holes formed therein for receiving said first, second and third pivot rods respectively in aligned relation to each other; said mounting bracket further including wall means extending between said pair of end plates and having guide slots formed therein for receiving therethrough and operably aligning said sublevers, said trip levers and said keylevers; and said end plates and said wall means defining complementary tabs and tab receiving slots for positioning and securing said end plates and said wall means relative to each other.
Claim 3
Dependent Claim
92 words
In a powered typewriter according to claim 1: said end plates of said mounting bracket having an L-shaped configuration with a top portion, a bottom portion, a front portion and a back portion; and said wall means of said mounting bracket including a top wall connecting the top portion of said L-shaped end plates, a bottom wall connecting the bottom portions of said L-shaped end plates, an upper front wall connecting said front portions of said L-shaped end plates, and a back wall connecting said back portions of said L-shaped end plates.
Claim 4
Dependent Claim
95 words
In a powered typewriter according to claim 1: said plurality of pivotally supported keylevers each having a finger for contacting an associated trip lever; said plurality of pivotally supported trip levers each having a first arm for contacting the cam of an associated sublever and a second arm for contacting the finger of an associated keylever; and a plurality of resilient biasing means each connected between said mounting bracket and a trip lever for urging the second arm against the projecting finger of an associated keylever to pivot said keylever about said third pivot rod.
Claim 5
Dependent Claim
155 words
In a powered typewriter according to claim 3, the combination further comprising: a keylever control mechanism for limiting the pivotal movement of said plurality of trip levers under the urging of said resilient biasing means and the corresponding pivotal movement of said plurality of keylevers to determine the normal rest position of said plurality of keylevers; said keylever control mechanism including a stop member extending beside one of the first or second arms of said plurality of trip levers; said stop member having a cross-sectional configuration in the form of a cam and Being rotatably supported for enabling adjustment of the normal rest position of said plurality of keylevers and the distance of keylever movement necessary to move a cam into engagement with a power roll; and said keylever control mechanism further including a control means connected in controlling relation with said rotatably supported stop member and being manually operable for rotating said stop member.
Claim 6
Dependent Claim
169 words
In a powered typewriter according to claim 3, the combination further comprising: a pressure control mechanism for adjusting the pressure necessary to pivot said plurality of keylevers to move a cam into enagagement with a power roll; said pressure control mechanism including spring means in the form of a plurality of leaf springs secured to said mounting bracket adjacent said plurality of trip levers with each leaf spring being associated with a different trip lever and positioned in blocking relation to the path of movement of said trip lever; said pressure control mechanism further including an adjusting member extending beside said plurality of leaf springs; said adjusting member having a cross-sectional configuration in the form of a cam and being rotatably supported for bending said plurality of leaf springs to adjust the spring tension resisting pivotal movement of said trip levers; and said pressure control mechanism including a control means connected in controlling relation with said rotatably supported adjusting member and being manually operable for rotating said adjusting member.
Claim 7
Dependent Claim
135 words
In a typewriter according to claim 2, the combination further comprising: a plurality of return springs each associated with a different one of said plurality of sublevers for resisting the driven movement of said sublevers and urging said sublevers to a rest position; said bottom wall of said mounting bracket having an extension in a direction away from said plurality of pivotally supported sublevers; said extension of said bottom wall having a plurality of holes formed therein and arranged in columns with each column of holes being associated with a different one of said plurality of sublevers; and said plurality of return springs each being stretched to a selected one of said column of holes associated with each sublever to selectively control the tension of said return spring urging said sublever to a rest position.
Claim 8
Dependent Claim
151 words
In a typewriter according to claim 1, the combination further comprising: an impression control mechanism for uniformly varying the impact intensity of type bars linked to said plurality of sublevers and driven in a printing movement by the engagement of an associated cam with the power roll; said impression control mechanism including a stop member extending beside the power roll and said cams for limiting the engagement of said cams with the power roll to control the impact intensity of the type bars; said stop member being supported for movement from a first position enabling maximum engagement of said cams with the power roll and a second position enabling minimum engagement of said cams with the power roll; and said impression control mechanism further including a control means connected in controlling relation with said stop member and being manually operable for moving said stop member between said first and second positions.
Claim 9
Dependent Claim
133 words
In a typewriter according to claim 1, the combination further comprising: a line lock mechanism for preventing type bars linked to said sublevers from undergoing a printing movement when a carriage is at a right margin stop position; said line lock mechanism including a bail extending beside said mounting bracket and the power roll; said bail being supported for movement between an inoperative position enabling the engagement of said cams with the power roll and blocking position restricting the engagement of said cams with the power roll to prevent the type bars from undergoing a printing movement; and said line lock means further inCluding linkage means operable in response to the movement of the carriage to a right margin stop position for moving said bail from the inoperative position to the blocking position.
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |