Claims
- 1. A platen knob device of a typewriter, comprising:
- a first clutch member having two pawls having on a periphery thereof engageable surfaces, said first clutch member being fixed onto a platen shaft;
- a second clutch member having a surface engageable with the engageable surfaces of the first clutch member and teeth constituting a platen pitch feed mechanism, said second clutch member axially slidably mounted on the platen shaft;
- a first resilient member for urging the engageable surface of the second clutch member against the engageable surfaces of the first clutch member;
- a platen knob axially slidably mounted on the platen shaft and having a cylindrical portion bottomed at a base thereof, said cylindrical portion being formed with square openings through which proximal portions of said two pawls transeversely extend, an end face of said cylindrical portion being opposite to said second clutch member;
- a second resilient member interposed between said platen knob and said first clutch member and for axially urging outwardly said platen knob so that said proximal portions are abutted on right edges of said openings and axial clearance corresponding to axial movement of said platen knob is defined between each proximal portion and each left edge of said square openings; whereby said platen knob is capable of displacing by said axial clearance and the axial displacement of said platen knob causes said second clutch member to disengage from said first clutch member for continuous rotation of said platen.
Priority Claims (1)
Number |
Date |
Country |
Kind |
55-94520 |
Jul 1980 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 280,020, filed June 30, 1981, now abandoned.
US Referenced Citations (8)
Non-Patent Literature Citations (1)
Entry |
IBM Selectric Typewriter Service Manual, May 1975, IBM Corp., pp. 145, 149. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
280020 |
Jun 1981 |
|