Patent US3799315A successfully refreshed from Google Patents.
US3799315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon guide for typewriter ribbon cartridge
Assignee: SCM Corp
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Filing: 1972-05-03
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Granted: 1974-03-26
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Expires: 1992-05-03
Abstract
Abstract A ribbon guide or carrier arm for a typewriter ribbon cartridge is disclosed. The carrier arm which is pivotally connectable to the cartridge housing to laterally extend therefrom, has means for guiding a ribbon from the housing to a print point and back to the housing. An aperture is provided adjacent the end of the arm for exposing a portion of the ribbon to a type element at the print point. A retaining finger is provided adjacent the aperture to retain the ribbon for uniform smudge free typing. A cap on the end of the arm cooperates with the retaining finger in retaining the ribbon.
Inventors
- 👤 D Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:43
CPC Classifications
B; B41; B41J; B41J35/00; B41J35/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
An improved cartridge for a ribbon for a typewriter having at least one typing element, the cartridge having a housing and an arm for guiding a loop of the ribbon having upper and lower limbs from the housing to the end of the arm, the arm having a first window for exposing the upper limb of ribbon to the typing element, wherein the improvement comprises the arm having a recess in a rear surface of said arm near thE housing side of the first window and a finger projecting upward from the lower portion of the recess and positioned at least partially in the recess to guide the upper limb of ribbon between the finger and the recess so that the upper limb of ribbon will be taut across the first window even during and immediately after impacts of the typing element.
Claim 2
Dependent Claim
142 words
An improved cartridge for a ribbon for a typewriter having at least one typing element, the cartridge having a housing and an arm for guiding a loop of the ribbon having upper and lower limbs from the housing to the end of the arm, the arm having a first window for exposing the upper limb of ribbon to the typing element, wherein the improvement comprises the arm having a recess in a rear surface of said arm near thE housing side of the first window and a finger projecting upward from the lower portion of the recess and positioned at least partially in the recess to guide the upper limb of ribbon between the finger and the recess so that the upper limb of ribbon will be taut across the first window even during and immediately after impacts of the typing element.
Claim 3
Dependent Claim
18 words
The cartridge of claim 1 in which the finger is formed integral with the arm from a plastic.
Claim 4
Dependent Claim
13 words
The cartridge of claim 1 in which the recess is a second window.
Claim 5
Dependent Claim
110 words
The cartridge of claim 1 in which the arm has a first proximal channel at least as wide as the width of the ribbon in said rear surface in communication with the housing side of the first window, the recess is in a portion of the first proximal channel and substantially spans the first proximal channel, the finger projects upward from the lower portion of the first proximal channel, and the upper portion of the first proximal channel overhangs at least a portion of the top of the finger so that the upper limb of ribbon will be trapped in the first proximal channel between the finger and the recess.
Claim 6
Dependent Claim
64 words
The cartridge of claim 4 in which the arm has a V-shaped end with a first distal channel at least as wide as the width of the ribbon in said rear surface in communication with the V-shaped end side of the first window and substantially in line with the first proximal channel to help support the upper limb of ribbon across the first window.
Claim 7
Dependent Claim
30 words
The cartridge of claim 5 in which the arm has a hollow V-shaped cap on said V-shaped end to trap the upper limb of ribbon in the first distal channel.
Claim 8
Dependent Claim
50 words
The cartridge of claim 4 in which the arm has a second proximal channel at least as wide as the width of the ribbon in said rear surface in communication with the housing side of the first window below the first proximal channel to guide the lower limb of ribbon.
Claim 9
Dependent Claim
77 words
The cartridge of claim 7 in which the arm has a V-shaped end with first and second distal channels each at least as wide as the width of the ribbon in said rear surface in communication with the V-shaped end side of the first window and substantially in line with the first and second proximal channels respectively to help support the upper limb of ribbon across the first window and to guide the lower limb of ribbon.
Claim 10
Dependent Claim
35 words
The cartridge of claim 8 in which the arm has a hollow V-shaped cap on said V-shaped end to trap the upper and lower limbs of ribbon in the first and second distal channels respectively.
Claim 11
Dependent Claim
53 words
The cartridge of claim 9 in which, except across the first and second distal channels, the V-shaped end of the arm has a flange around the mouth of the V to guide the ribbon across the front face of the V-shaped end and to provide a mounting surface for the hollow V-shaped cap.
Claim 12
Dependent Claim
63 words
The cartridge of claim 10 in which the V-shaped end of the arm has a projection on the point of the V and the hollow V-shaped cap has an aperture in the point of the V for the projection to help position the cap on the end of the arm and to prevent the ribbon from riding over the end of the arm.
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |