Patent GB-1005418-A (GB)
Title: Tape-controlled means for positioning a movable member
IPC: F15B11/00
Filed: 1963-11-21
Abstract: 1,005,418. Machine tool details. MOOG SERVOCONTROLS Inc. Nov. 21, 1963 [Jan. 7, 1963], No. 45980/63. Heading B3B. [Also in Division G3] Fluid pressure operating means in a machine comprises manual control means 44, Fig. 4, associated with transducers 16, 29. The operated member is a table 1, of a machine tool, mounted on a saddle 2. Rotatably attached to the table is a piston 5 which slides on a stationary rod 10 and in a cylinder 7 in a manner similar to that described in Specification 954,444. The piston has a helical land 6 and is attached to the rod 10 by a sliding pin 11 so that the piston and rod rotate together. An hydraulic fluid flow path is established to the cylinder 7, through perforated valve plates 15, passages 18, 19, a chamber 20, passages 23, 22 and a cylinder spacer 21. Hydraulic fluid is supplied through a line 32 and a constriction 33 to the cylinder 7 and through lines 30 with constrictions 31 to a rotary-vane motor 4 associated with valve plates 28 leading to a return line.35. The positions of the valve plates 15, 28 are determined by pneumatic-hydraulic transducers operated by pneumatic pressure supplied from a line 43 and lines 40-42, 55, 56, the latter being operative or vented to atmosphere as determined either by the manually-set valves 44 or by a punched tape 50. The transducers 16, Fig. 5, are normally supplied with pressure air to bulge a diaphragm 64 (lower-half of Figure) to seal off a nozzle 65. When pressure is released (upper-half) hydraulic fluid passes through the nozzle 65 into a line 71 to allow an operating piston 68 to move a valve plate 15. The control means are housed in a console 79, Fig. 1, and include a tape reading means 77, a change-over knob 78 and manual controls 44X, 44Y for movements in the X and Y axes. The controls 44X, Fig. 20, comprise a group of manually-set rotary discs 98, each numbered to indicate the set position. The discs are mounted on a hollow shaft 82 corresponding to the pressure line 43, Fig. 4. The discs are formed with ports to make the necessary connections to fixed port members 88 for venting selected lines 110 corresponding to the lines 36, 45 &c. of Fig. 4. The change-over knob 78 oscillates a series of perforated discs 96 to render either the tape or the manual control operative. Each pair of discs 96 and 98 is clamped in the set position against a port member 88 by an annalar piston 95. Each disc 98 is held in position by a spring-pressed roller 140, Fig. 21, and by a bar 145 entering a groove 120, the bar 145 also serving to convey the movement of the change-over knob 78 to the disc 96. The tape reader block 51, Fig. 4, is vertically movable and is clamped against the tape during reading by a flexible bladder against the force of an encircling leaf spring. The backing block 49 of the tape-reader is grooved along the path of the sprocket-feeding holes in the tape. The driving sprocket 212, Fig. 1, is advanced intermittently by a Geneva mechanism which is associated with switches controlling an electric driving motor 229, Fig. 9, for the mechanism and the air control valve 57. The motor 229 can be adjusted by swinging its mounting about a screw 245 on a bracket 234 adjustable about a pivot screw 239. The adjustments enable the tape to be adjusted axially by angularly moving the sprocket-wheel 212 and the Geneva mechanism to be adjusted for backlash. Spring- pressed hold-down plates contacting the tape at each side of the reading head can be lifted by a hand-lever.