Geometrical instruments – Miscellaneous – Light direction
Patent
1982-05-19
1983-12-13
Little, Willis
Geometrical instruments
Miscellaneous
Light direction
33434, 33448, B43L 1302
Patent
active
044198230
ABSTRACT:
There is indicated a programmable braking device for the X guide block (18) and the Y guide block (30) of a drafting machine which comprises a brake band (42, 60) which is moved together with the considered guide block. The band revolves around guide pulleys (38, 40; 62, 64), which are arranged laterally outside the displacement path, and is lockable by an associated magnetic brake (44-58; 70-76). In a modified programmable braking device, the guide block (30) carrying the drafting head carries two direction brakes (130, 132) for the two co-ordinate directions. These brakes each comprise a freely running belt conveyor which is movable against the drawing surface in a friction grip.
REFERENCES:
patent: 3567950 (1971-03-01), Meyer
patent: 3744891 (1973-07-01), Dennis et al.
patent: 3950853 (1976-04-01), Andrew
patent: 4268969 (1981-05-01), Koenuma
Little Willis
Marabuwerke Erwin Martz GmbH & Co.
Philpitt Fred
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