Typewriting machines – For line-spacing by incremental rotation of platen – By pawl and ratchet wheel drive
Patent
1993-06-29
1995-03-21
Burr, Edgar S.
Typewriting machines
For line-spacing by incremental rotation of platen
By pawl and ratchet wheel drive
400574, 355212, 355237, B41J 1980
Patent
active
053990374
ABSTRACT:
A magnetic actuator apparatus which transfers a magnetic force produced by a solenoid to a movable arm. The arm is movable between an engaged position spaced away from the solenoid and a solenoid position abutting the solenoid. The arm has a bore formed therein opposite the solenoid. A magnetic member is slidingly received in the bore. The magnetic member is spaced away from the solenoid a distance less than the arm when the arm is in the engaged position and abuts the solenoid when the arm is in the solenoid position. A head is connected to the magnetic member on the side of the arm opposite the solenoid to prevent the magnetic member from passing through the bore. The head transfers the force applied to the magnetic member to the arm when the solenoid is energized. The arm and the magnetic member move in unison until the magnetic member abuts the solenoid at which point the arm moves relative to the magnetic member until the arm reaches the solenoid position.
REFERENCES:
patent: 2814764 (1955-01-01), De Fligue et al.
patent: 3271707 (1966-09-01), Koehler
patent: 4895463 (1990-01-01), Wysk
patent: 4934848 (1990-06-01), Hayashi et al.
Burr Edgar S.
Hewlett--Packard Company
Hilten John S.
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