G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/26 (2006.01) B23B 31/12 (2006.01) F26B 5/08 (2006.01) G11B 23/00 (2006.01)
Patent
CA 2451583
A device for rotation of disc-shaped elements of different diameter, such as matrices for manufacturing audio and video discs. The device comprises a rotatable chuck (10) in which three arms (20) distributed evenly in the peripheral direction are pivotably mounted, the said arms having a radially outer stop element (22) for contact with an outer peripheral edge of a disc element inserted in the chuck. The chuck has a rotatably mounted central gearwheel (18) which is preloaded by means of tension spring elements (28) towards a rotational position in which the central gearwheel (18) tends to hold the arms (20) and their stop elements (22) in a pivoted-in position in the chuck. The arms (20) are synchronously pivotable towards a pivoted-out position counter to the action of the tension spring elements (28). The device comprises a retaining mechanism (30-40) which is configured to lock the rotation of the central gearwheel (18) relative to the base plate (16) when a predetermined speed of the chuck (10) is reached.
Alpha Sweden Ab
Fetherstonhaugh & Co.
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