Patent US3756147A successfully refreshed from Google Patents.
US3756147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coil spring biased printing wheels
Assignee: Chubb Cash Registers Ltd
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Filing: 1971-07-08
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Granted: 1973-09-04
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Expires: 1991-07-08
Abstract
Abstract The invention provides a printing device including a printing wheel which carries peripheral printing characters and peripheral ratchet teeth whereby it can be stopped at required printing positions. The wheel is of reduced width at and adjacent the ratchet teeth so that the printing characters can be of full width while a spring can be located at the part of reduced width and can extend out of the wheel to an external position of anchorage.
Inventors
- 👤 H Gross
- 👤 S Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:01
CPC Classifications
B; B41; B41J; B41J1/00; B41J1/22; B41J1/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
191 words
In a printing device having printing wheels rotated by coil springs, a printing wheel having a segmental part which is thicker axially than the remainder segmental part; printing characters on the periphery of one segmental part of the wheel; ratchet teeth on the periphery of the other segmental part of said wheel; the segmental part of the wheel that carries the printing chaRacters including a central boss having an axial thickness at least as great as the width of the printing characters axially of the wheel; the remainder segmental part of the wheel which includes the ratchet teeth and the part of the wheel between the ratchet teeth and the boss thereby being of reduced thickness to receive a coiled spring of smaller diameter than the difference in thicknesses between the said segmental parts, and means for attachment to one end of said spring, said means being located in the remainder segmental part of reduced thickness, whereby the spring can be located within the overall axial width of the wheel to extend partly around the boss and to extend beyond the periphery of the wheel for attachment to a fixed support.
Claim 2
Dependent Claim
191 words
In a printing device having printing wheels rotated by coil springs, a printing wheel having a segmental part which is thicker axially than the remainder segmental part; printing characters on the periphery of one segmental part of the wheel; ratchet teeth on the periphery of the other segmental part of said wheel; the segmental part of the wheel that carries the printing chaRacters including a central boss having an axial thickness at least as great as the width of the printing characters axially of the wheel; the remainder segmental part of the wheel which includes the ratchet teeth and the part of the wheel between the ratchet teeth and the boss thereby being of reduced thickness to receive a coiled spring of smaller diameter than the difference in thicknesses between the said segmental parts, and means for attachment to one end of said spring, said means being located in the remainder segmental part of reduced thickness, whereby the spring can be located within the overall axial width of the wheel to extend partly around the boss and to extend beyond the periphery of the wheel for attachment to a fixed support.
Claim 3
Dependent Claim
91 words
A printing wheel as claimed in claim 1, said printing device including a pawl adapted to be moved into and out of engagement with pawl engaging faces on the said ratchet teeth; and the pawl engaging face of each tooth being undercut in the direction such that the outer end of this face will normally overlie the outer end of the pawl, whereby the face can hold the pawl engaged due to the pressure on said pawl by said face exerted by the said spring until said pawl is forced out.
Claim 4
Dependent Claim
117 words
A printing wheel as claimed in claim 2, said thicker segmental part having an arcuate slot thereon concentric with the axis of said wheel, a sprindle rotatably carrying said wheel; a rod passing through said arcuate slot and disposed parallel with said spindle; means in the printing device for supporting said rod whereby same can be driven in one direction to bring the printing wheel to a ''''starting'''' position, and can be driven in the opposite direction to allow the printing wheel to rotate under the influence of the spring until the wheel is arrested by said pawl; said rod serving to bring the wheel back to ''''starting'''' position by engagement with the end of said slot.
Claim 5
Dependent Claim
35 words
A printing wheel as claimed in claim 2, said remainder segmental part having at one end a peripheral portion of sufficient radius to serve to force the pawl out of engagement with the ratchet teeth.
Claim 6
Dependent Claim
74 words
A printing wheel as claimed in claim 1, said remainder segmental part having an opening therethrough at one end; and said attachment means comprising a projection on the wheel extending partly over the said opening, a pin on the projection located for attachment thereto of one end of said spring, said pin being located within the opening whereby the spring will be held onto the pin by engagement with the said remainder segmental part.
Claim 7
Dependent Claim
20 words
A printing wheel as claimed in claim 1, wherein the entire wheel is made in a single integral moulded piece.
Claim 8
Dependent Claim
19 words
A printing wheel as claimed in claim 1, having a groove in the boss to receive the said spring.
Claim 9
Dependent Claim
84 words
In a printing device as set forth in claim 3, said printing device having a series of wheels located side by side on a common spindle, together with said related coil springs acting thereon continuously urging the wheels in one rotary direction; the outer ends of the springs being anchored outside the diameter of the wheels, means to release all the wheels simultaneously whereupon they are rotated by the springs, and related pawls engageable with said teeth to stop the wheels in required positions.
Claim 10
Dependent Claim
17 words
A printing device as claimed in claim 8 wherein adjacent wheels are in contact with each other.
Claim 11
Dependent Claim
104 words
A printing device as claimed in claim 8, wherein each wheel has a peripheral part of large enough radius to serve to force its related pawl out of engagement with the ratchet teeth, and wherein the pawls are two-armed, electromagnetic means for actuating the pawls, one arm of each pawl engaging the ratchet teeth and the other arm being actuated towards the ratchet teeth by said electromagnetic means, said pawls being held in the ratchet teeth by the pressure of the springs when the electromagnetic means is switched off until forced out of the ratchet teeth by said peripheral parts of large enough radius.
Claim 12
Dependent Claim
71 words
A prInting device as claimed in claim 8, wherein each of the wheels has a concentric slot and a single rod engages in the slots of all the wheels, said rod being movable around the same axis as the wheels to restore the wheels to normal in one direction and to allow the wheels to move under the action of the springs in the other direction until stopped by the pawls.
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |