| 摘要 |
1,069,352. Selective printing. INTERNATIONAL BUSINESS MACHINES CORPORATION. Jan. 4, 1966 [Jan. 5, 1965], No. 251/66. Heading B6F. [Also in Divisions G3 and G4] A fluid serial to parallel converter comprises a series of bi-stable latches 21, a rotary distributer 31 having an outlet channel 32 which is connectable to a source of fluid under pressure and which is rotatable to distribute switching pulses to input channels 27 of the latches in succession, a valve 36 disposed at the centre of rotation of the outlet channel and selectively operable to block the passage of fluid to said outlet channel and an output device 60 arranged to indicate the state of all the latches simultaneously at intervals between successive distributions by the distributer. As shown, upon receiving a start bit from transmission line 11, solenoid 35 will cause valve 36 and rod 46 to move to the left, pivoting lever 48 against clutch latch 45 and completing the drive between shaft 43 and pulley 42. Rotation of shaft 43 causes channel 32 to sweep past signal input channels 27 of each latch 21 at a time corresponding to the time at which a signal pulse if one exists is to be received. The signal impulses are converted into fluid pulses by solenoid 35 displacing valve 36 which provides selective communication between a fluid pressure source (not shown) connected to inlet 38 and outlet channel 32. Latches 21 (Figs. 2 and 3, not shown), are provided, one for each bit. The state of each latch is determined by whether a jet issuing from a plenum (22) and then through a throat (23) follows a first wall (24a) or a second wall (24b). Input signal pulses flowing through channel (27) make the jet flow along (24b) where it will alter the position of a vane (61) to enable a probe (62) of lever (66) to move downwards through a slot (65). A cable (12) is connected to lever (66) to transmit its motion, e.g. to a typewriter or paper tape punch (13). Parallel output.-As shown, a typewriter 13 is operated by cables 12 from each latch 21 which enter a frame 71 and pass through a bail 72 pivoted about an axis 74 and spring-biased to tend to permit the wires to move to the right under the influence of springs (68), Fig. 3. A face cam 76 mounted on shaft 43 is engaged by cam follower 77 on bail 72 and holds the bail in a leftward position maintaining probes 62 in their raised position. At the point in the cycle between the time that the outlet channel 32 has passed the last latch 21 and before a reset valve 52 has reset the latches, the follower 77 moves to the low dwell portion 76b of the cam 76 and permits the wires to move to the right to sense the position of vanes 61. |
