G - Physics – 11 – B
Patent
G - Physics
11
B
352/24.25
G11B 5/00 (2006.01) G11B 15/10 (2006.01) G11B 15/18 (2006.01)
Patent
CA 1246738
22 ABSTRACT: The head-mounting plate of a cassette apparatus is positioned, in part, through the operation of a servo having a motor-driven servo wheel whose rotation is ini- tiated by pulsed operation of an impulse relay. The servo wheel has teeth around its circumference except for two portions defining wheel rest positions. In the rest posi- tion of the wheel, a starting torque is applied by pres- sure on a cam on the wheel, rotation being prevented by a latching arrangement. The impulse relay is engaged by a relay-armature member which has an elastically deflectable arm and a rigid arm, the end of the elastically deflect- able arm having a rigid support for a soft iron element which can be attracted to the impulse relay, and a coupling element which couples the elastically deflectable arm to the rigid arm, so that movement of the rigid arm in one direct is prevented by the engagement with the relay. Deflection of the deflectable arm permits movement of the relay-armature member through an additional pivotal move- ment toward the latching relay. In the latching position of the relay-armature member, a stop on the member abuts a latching projection on the servo wheel to keep the wheel in a latched position. An impulse energization of the impulse relay releases the soft iron element, and a spring pivots the relay-armature member to an inoperative posi- tion in which the servo wheel is freed to rotate under the influence of the starting torque, so that the circum- ferential teeth mesh with a drive pinion connected to a drive motor which may be constantly rotating. A reset protection on the relay-armature member is actuated by the latching projection for pivoting the member back to the latching position so that the latching projection can abut the stop when the servo wheel has again reached the rest position.
485752
Fetherstonhaugh & Co.
N.v.philips'gloeilampenfabrieken
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