Patent US4569607A successfully refreshed from Google Patents.
US4569607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing hammer rebound control
Assignee: Ricoh Co Ltd
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Filing: 1984-04-25
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Granted: 1986-02-11
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Expires: 2004-04-25
Abstract
Abstract A printing hammer rebound control system for use in impact-type printing machines is provided. The present system includes separate memory devices for storing the information of primary and its associated secondary energization. The primary energization is to move the printing hammer in the printing direction and the secondary energization is to slow down the hammer when it is in the returning motion. The present system applies an appropriate secondary energization in accordance with the intensity of the primary energization applied, thereby allowing to maintain the level of hammer rebound and production of noise at a minimum.
Inventors
- 👤 Takeshi Takemoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:49
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/42
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
253 words
A printing hammer rebound control system for use in an impact type printing machine including a slidably supported hammer which has a core section and an impact surface for impacting a selected one of type elements, a coil disposed in operative association with said core section and biasing means for biasing said hammer in a predetermined direction, said rebound control system comprising: means for applying a primary energization signal to said coil to move said hammer in the forward direction to apply an impact force to said selected one of type elements, said primary energization signal being provided from stored primary energization data so as to be variable in intensity depending upon the type element selected for at least some of said type elements; means for applying a secondary energization signal after termination of said primary energization signal to said coil to apply a force to said hammer in said forward direction when said hammer is approaching its original position during its returning motion, said secondary energization signal being provided from secondary energization data previously determined varyingly in accordance with the intensity of said primary energization signal and being the same in intensity but variable in timing of application in accordance with the intensity of said primary energization signal; storing means for separately storing said primary and secondary energization data; and means for generating said primary and secondary energization signals separately; thereby maintaining the amount of rebound of said hammer at a minimum even if the intensity of said primary energization signal varies.
Claim 2
Dependent Claim
253 words
A printing hammer rebound control system for use in an impact type printing machine including a slidably supported hammer which has a core section and an impact surface for impacting a selected one of type elements, a coil disposed in operative association with said core section and biasing means for biasing said hammer in a predetermined direction, said rebound control system comprising: means for applying a primary energization signal to said coil to move said hammer in the forward direction to apply an impact force to said selected one of type elements, said primary energization signal being provided from stored primary energization data so as to be variable in intensity depending upon the type element selected for at least some of said type elements; means for applying a secondary energization signal after termination of said primary energization signal to said coil to apply a force to said hammer in said forward direction when said hammer is approaching its original position during its returning motion, said secondary energization signal being provided from secondary energization data previously determined varyingly in accordance with the intensity of said primary energization signal and being the same in intensity but variable in timing of application in accordance with the intensity of said primary energization signal; storing means for separately storing said primary and secondary energization data; and means for generating said primary and secondary energization signals separately; thereby maintaining the amount of rebound of said hammer at a minimum even if the intensity of said primary energization signal varies.
Claim 3
Dependent Claim
13 words
A system of claim 1, wherein said storing means includes a semiconductor memory.
Claim 4
Dependent Claim
13 words
A system of claim 2, wherein said semiconductor memory is a read-only memory.
Claim 5
Dependent Claim
35 words
A system of claim 1, wherein said primary energization data is stored in said storing means in the form of codes each indicating the width of a current pulse to be applied to said coil.
Claim 6
Dependent Claim
31 words
A system of claim 1, wherein said impact type printing machine further includes a damper disposed to be engageable with said hammer when said hammer is located at its original position.
Claim 7
Dependent Claim
28 words
A system of claim 5, wherein said biasing means includes a spring which normally presses said hammer against said damper to keep said hammer at its original position.
Claim 8
Dependent Claim
253 words
A printing hammer rebound control system for use in an impact type printing machine including a slidably supported hammer which has a core section and an impact surface for impacting a selected one of type elements, a coil disposed in operative association with said core section and biasing means for biasing said hammer in a predetermined direction, said rebound control system comprising: means for applying a primary energization signal to said coil to move said hammer in the forward direction to apply an impact force to said selected one of type elements, said primary energization signal being provided from stored primary energization data so as to be variable in intensity depending upon the type element selected for at least some of said type elements; means for applying a secondary energization signal after termination of said primary energization signal to said coil to apply a force to said hammer in said forward direction when said hammer is approaching its original position during its returning motion, said secondary energization signal being provided from secondary energization data previously determined varyingly in accordance with the intensity of said primary energization signal and being the same in timing of application but variable in intensity in accordance with the intensity of said primary energization signal; storing means for separately storing said primary and secondary energization data; and means for generating said primary and secondary energization signals separately; thereby maintaining the amount of rebound of said hammer at a minimum even if the intensity of said primary energization signal varies.
Claim 9
Dependent Claim
253 words
A printing hammer rebound control system for use in an impact type printing machine including a slidably supported hammer which has a core section and an impact surface for impacting a selected one of type elements, a coil disposed in operative association with said core section and biasing means for biasing said hammer in a predetermined direction, said rebound control system comprising: means for applying a primary energization signal to said coil to move said hammer in the forward direction to apply an impact force to said selected one of type elements, said primary energization signal being provided from stored primary energization data so as to be variable in intensity depending upon the type element selected for at least some of said type elements; means for applying a secondary energization signal after termination of said primary energization signal to said coil to apply a force to said hammer in said forward direction when said hammer is approaching its original position during its returning motion, said secondary energization signal being provided from secondary energization data previously determined varyingly in accordance with the intensity of said primary energization signal and being the same in timing of application but variable in intensity in accordance with the intensity of said primary energization signal; storing means for separately storing said primary and secondary energization data; and means for generating said primary and secondary energization signals separately; thereby maintaining the amount of rebound of said hammer at a minimum even if the intensity of said primary energization signal varies.
Claim 10
Dependent Claim
13 words
A system of claim 7, wherein said storing means includes a semiconductor memory.
Claim 11
Dependent Claim
13 words
A system of claim 8, wherein said semiconductor memory is a read-only memory.
Claim 12
Dependent Claim
35 words
A system of claim 7, wherein said primary energization data is stored in said storing means in the form of codes each indicating the width of a current pulse to be applied to said coil.
Claim 13
Dependent Claim
30 words
A system of claim 7, wherein said impact printing machine further includes a damper disposed to be engageable with said hammer when said hammer is located at its original position.
Claim 14
Dependent Claim
28 words
A system of claim 11, wherein said biasing means includes a spring which normally presses said hammer against said damper to keep said hammer at its original position.
Claim 15
Dependent Claim
252 words
A printing hammer rebound control system for use in an impact type printing machine including a slidably supported hammer which has a core section and an impact surface for impacting a selected one of type elements, a coil disposed in operative association with said core section and biasing means for biasing said hammer in a predetermined direction, said rebound control system comprising: means for applying a primary energization signal to said coil to move said hammer in the forward direction to apply an impact force to said selected one of type elements, said primary energization signal being provided from stored primary energization data so as to be variable in intensity depending upon the type element selected for at least some of said type elements; means for applying a secondary energization signal after termination of said primary energization signal to said coil to apply a force to said hammer in said forward direction when said hammer is approaching its orginal position during its returning motion, said secondary energization signal being provided from secondary energization data previously determined varyingly in accordance with the intensity of said primary energization signal and being variable both in intensity and in timing of application in accordance with the intensity of said primary energization signal; storing means for separately storing said primary and secondary energization data; and means for generating said primary and secondary energization signals separately; thereby maintaining the amount of rebound of said hammer at a minimum even if the intensity of said primary energization signal varies.
Claim 16
Dependent Claim
252 words
A printing hammer rebound control system for use in an impact type printing machine including a slidably supported hammer which has a core section and an impact surface for impacting a selected one of type elements, a coil disposed in operative association with said core section and biasing means for biasing said hammer in a predetermined direction, said rebound control system comprising: means for applying a primary energization signal to said coil to move said hammer in the forward direction to apply an impact force to said selected one of type elements, said primary energization signal being provided from stored primary energization data so as to be variable in intensity depending upon the type element selected for at least some of said type elements; means for applying a secondary energization signal after termination of said primary energization signal to said coil to apply a force to said hammer in said forward direction when said hammer is approaching its orginal position during its returning motion, said secondary energization signal being provided from secondary energization data previously determined varyingly in accordance with the intensity of said primary energization signal and being variable both in intensity and in timing of application in accordance with the intensity of said primary energization signal; storing means for separately storing said primary and secondary energization data; and means for generating said primary and secondary energization signals separately; thereby maintaining the amount of rebound of said hammer at a minimum even if the intensity of said primary energization signal varies.
Claim 17
Dependent Claim
13 words
A system of claim 13, wherein said storing means includes a semiconductor memory.
Claim 18
Dependent Claim
13 words
A system of claim 14, wherein said semiconductor memory is a read-only memory.
Claim 19
Dependent Claim
35 words
A system of claim 13, wherein said primary energization data is stored in said storing means in the form of codes each indicating the width of a current pulse to be applied to said coil.
Claim 20
Dependent Claim
31 words
A system of claim 13, wherein said impact type printing machine further includes a damper disposed to be engageable with said hammer when said hammer is located at its original position.
Claim 21
Dependent Claim
28 words
A system of claim 17, wherein said biasing means includes a spring which normally presses said hammer against said damper to keep said hammer at its orginal 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) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |