US4457635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printer arm
Assignee: Hitachi Ltd
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Filing: 1982-02-04
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Granted: 1984-07-03
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Expires: 2002-02-04
Abstract
Abstract A printer arm for transmitting an impact to a wire stylus in a wire matrix printing head is disclosed. The print arm includes a lever to one end of which the wire stylus is connected. The lever operates in the longitudinal direction of the wire stylus. The lever is a hollow member of a polygonal cross-section and has walls extending substantially in parallel to the direction of operation of the lever. Each of the side wall is provided with at least one through hole for reducing the weight of the lever. The portion of each side wall around each hole is protruded from the other portion of the side wall. This construction effectively suppresses the lateral vibration of the side walls of the lever and to improve the mechanical strength of the lever while reducing the weight of the same.
Inventors
- 👤 Kenichiro Takezawa
- 👤 Mineo Harada
- 👤 Yutaka Kako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:20
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/235; B41J2/25; B41J2/26
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
125 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever to one end of which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polygonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, each of said side walls of said lever is provided with at least one through hole, a portion of said side wall around said hole is provided with a convexity, said lever is made from a thin sheet material, and the portion around said hole has a thickness greater than a thickness of other portions of said side wall.
Claim 2
Dependent Claim
125 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever to one end of which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polygonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, each of said side walls of said lever is provided with at least one through hole, a portion of said side wall around said hole is provided with a convexity, said lever is made from a thin sheet material, and the portion around said hole has a thickness greater than a thickness of other portions of said side wall.
Claim 3
Dependent Claim
34 words
A printer arm according to claim 1, characterized by further comprising: at least one second convexity formed in a portion of said side wall of said lever other than said portion around said hole.
Claim 4
Dependent Claim
28 words
A printer arm according to claim 2, wherein a second convexity protrudes in a direction opposite to a direction of protrusion of the first convexity around each hole.
Claim 5
Dependent Claim
119 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever having a first end to which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polyogonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, each of said side walls of said lever is provided with at least one through hole, and said side walls of said lever are provided with a plurality of convexities each of which have a longitudinal axis extending substantially in parallel with a direction of the longitudinal axis of said wire stylus.
Claim 6
Dependent Claim
119 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever having a first end to which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polyogonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, each of said side walls of said lever is provided with at least one through hole, and said side walls of said lever are provided with a plurality of convexities each of which have a longitudinal axis extending substantially in parallel with a direction of the longitudinal axis of said wire stylus.
Claim 7
Dependent Claim
104 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever having a first end to which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polyogonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, each of said side walls of said lever are provided with a plurality of convexities, and each convexity has a longitudinal axis extending substantially in parallel with a direction of the longitudinal axis of the wire stylus.
Claim 8
Dependent Claim
104 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever having a first end to which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polyogonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, each of said side walls of said lever are provided with a plurality of convexities, and each convexity has a longitudinal axis extending substantially in parallel with a direction of the longitudinal axis of the wire stylus.
Claim 9
Dependent Claim
45 words
A printer arm according to claim 5, wherein at least one through hole is provided in each of said side walls, and wherein a wall portion around each of said holes has a thickness greater than a thickness of other portions of said side walls.
Claim 10
Dependent Claim
130 words
An armature structure adapted to be rotatingly driven by an electromagnet comprising: a magnetic body portion adapted to be rotatingly driven around a predetermined axis by a magnetic force exerted by said electromagnet; and a hollow lever of a polygonal cross-section connected to said magnetic body portion, said lever having walls extending substantially in parallel to the direction of drive of said magnetic body portion, each of said side walls of said lever is provided with at least one through hole, a portion of said side wall around said hole is provided with a convexity, said hollow lever is made from a thin sheet material, and a portion around each of said through holes has a thickness greater than a thickness of other portions of each of said side walls.
Claim 11
Dependent Claim
130 words
An armature structure adapted to be rotatingly driven by an electromagnet comprising: a magnetic body portion adapted to be rotatingly driven around a predetermined axis by a magnetic force exerted by said electromagnet; and a hollow lever of a polygonal cross-section connected to said magnetic body portion, said lever having walls extending substantially in parallel to the direction of drive of said magnetic body portion, each of said side walls of said lever is provided with at least one through hole, a portion of said side wall around said hole is provided with a convexity, said hollow lever is made from a thin sheet material, and a portion around each of said through holes has a thickness greater than a thickness of other portions of each of said side walls.
Claim 12
Dependent Claim
143 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever to one end of which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polygonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, a plurality of through holes are provided in each of said side walls, said through holes being spaced from each other in an axial direction of said lever, a plurality of convexities are provided and arranged in an alternating fashion with said through holes, said lever is made from a thin sheet material and the wall portions around each of said through holes has a thickness greater than a thickness of other portions of the side walls.
Claim 13
Dependent Claim
143 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever to one end of which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polygonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, a plurality of through holes are provided in each of said side walls, said through holes being spaced from each other in an axial direction of said lever, a plurality of convexities are provided and arranged in an alternating fashion with said through holes, said lever is made from a thin sheet material and the wall portions around each of said through holes has a thickness greater than a thickness of other portions of the side walls.
Claim 14
Dependent Claim
31 words
A printer arm according to claim 8, wherein each of the convexities has a longitudinal axis extending substantially in parallel with a direction of a longitudinal axis of said wire stylis.
Claim 15
Dependent Claim
133 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever to one end of which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polygonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, a plurality of through holes are provided in each of said side walls, said through holes being spaced from each other in an axial direction of said lever, a plurality of convexities are provided and arranged in an alternating fashion with said through holes, each of the convexities has a longitudinal axis extending substantially in parallel with a direction of a longitudinal axis of said wire stylus.
Claim 16
Dependent Claim
133 words
A printer arm for transmitting an impact to a wire stylus in a wire matrix print head comprising: a wire stylus having a predetermined length; and a lever to one end of which said wire stylus is fixed at a portion thereof, said lever being a hollow member of a polygonal cross-section and having side walls substantially parallel to a longitudinal axis of said wire stylus, a plurality of through holes are provided in each of said side walls, said through holes being spaced from each other in an axial direction of said lever, a plurality of convexities are provided and arranged in an alternating fashion with said through holes, each of the convexities has a longitudinal axis extending substantially in parallel with a direction of a longitudinal axis of said wire stylus.
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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |