US3673956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed print mechanism with interposer arm for print hammer
Assignee: English Numbering Machines Ltd
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Filing: 1970-01-22
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Granted: 1972-07-04
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Expires: 1990-01-22
Abstract
Abstract Printing mechanisms comprising print hammers driven by striker arms selectively struck by projections on a rotating striker drum so that characters on print wheels are selectively printed on a sheet interposed between the wheels and the hammers. The striker arms are normally resiliently retained out of the path of the drum projections and selective energization of electromagnets causes the striker arms to be displaced into said path and thus impacted thereby causing a print to be made. Energization of the electromagnets may be controlled through a pulse counter which is fed in dependence on the rotation of the striker drum.
Inventors
- 👤 Manfred Huber
- 👤 Norbert Klimek
- 👤 Kenneth Herbert William Dee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:49
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/02; B41J9/10; B41J9/26; B41J9/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
241 words
A printing mechanism comprising in combination: a. a type wheel, b. a striker arm pivotably mounted for rotation about an axis parallel to the axis of said type wheel; c. an elongated print hammer extending in a direction transverse of the striker arm and engageable by that arm for longitudinal printing motion of the print hammer toward the type of wheel, d. a continuously rotatable striker drum, having a plurality of striker projections extending outwardly therefrom, e. means comprising an electromagnet which when energized is adapted to move the striker arm from a position spaced from said drum into an operative position wherein the end of said striker arm is accessible for engagement with a striker projection, for selective movement of the striker arm toward the type wheel; f. means defining a recess in said print hammer, and also defining a pair of abutments, rigid with said print hammer, disposed in the recess and slightly projecting from the walls of the recess, said abutments being spaced apart in a direction parallel to the length of the print hammer by a distance substantially corresponding to the width of the striker arm in said direction, and g. means for mounting the striker arm for operation by the electromagnet so as to be in sliding contact with both of said abutments of the print hammer, while the end of the striker arm variably extends beyond the print hammer for engagement by a striker projection.
Claim 2
Dependent Claim
241 words
A printing mechanism comprising in combination: a. a type wheel, b. a striker arm pivotably mounted for rotation about an axis parallel to the axis of said type wheel; c. an elongated print hammer extending in a direction transverse of the striker arm and engageable by that arm for longitudinal printing motion of the print hammer toward the type of wheel, d. a continuously rotatable striker drum, having a plurality of striker projections extending outwardly therefrom, e. means comprising an electromagnet which when energized is adapted to move the striker arm from a position spaced from said drum into an operative position wherein the end of said striker arm is accessible for engagement with a striker projection, for selective movement of the striker arm toward the type wheel; f. means defining a recess in said print hammer, and also defining a pair of abutments, rigid with said print hammer, disposed in the recess and slightly projecting from the walls of the recess, said abutments being spaced apart in a direction parallel to the length of the print hammer by a distance substantially corresponding to the width of the striker arm in said direction, and g. means for mounting the striker arm for operation by the electromagnet so as to be in sliding contact with both of said abutments of the print hammer, while the end of the striker arm variably extends beyond the print hammer for engagement by a striker projection.
Claim 3
Dependent Claim
136 words
A printing mechanism as defined in claim 1, further comprising controlling means associated with said striker drum, whereby upon rotation of said striker drum said controlling means energizes said electromagnet in a predetermined sequence, said controlling means comprising: a counter operable by rotation of said striker drum, output connection means of said counter being connected to said electromagnet effective to cause said energization thereof, an element rotatable with said striker drum, and having apertures, a light source located to one said of said element, a photosensitive transistor located to the opposite side of said element, whereby light from said light source reaches said photosensitive transistor only when one of said apertures lies between said light source and said photosensitive transistor, and output connection means of said photosensitive transistor connected to input connection means of said counter.
Claim 4
Dependent Claim
47 words
A printing mechanism as defined in claim 1, wherein said print hammer is are horizontally reciprocably mounted below said electromagnet, whereby said striker arm moves downwardly into said recess in the print hammer upon energization of the electromagnet, said striker drum being situated below said striker arm.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |