Patent GB-607870-A (GB)
Title: Device indicating the movements executed by metal cutting and the like machine-tools
IPC: B23Q15/00
Filed: 1945-07-09
Abstract: 607,870. Actuating and driving machines; boring and facing machines. PEGARD, M. July 9, 1945, Nos. 17436 and 17437. Convention dates, Jan. 24, 1942, and Dec. 10, 1942. [Class 83 (iii)] [Also in Group XXXVIII] In a metal-cutting machine tool, the directions of the feed movements and of the rotation of the spindle are indicated by the illumination of transparent arrows on a diagram repre. senting the machine, electric lamps behind the arrows being controlled by means operated by the main controls of the machine. Headstocks.-The indicating board Ti, Fig. 1, is mounted on a vertically adjustable spindle carriage C which carries control levers b, c, d for spindle speeds and various feeds, a feed selector lever e enabling either the spindle B or one of the three carriages C, T, P to be fed, a feed reversing lever f, a lever g for selecting slow, rapid or hand-operated feeds, a hand wheel i providing handoperated feeds, and a hand wheel for engaging the spindle feed and providing hand-operated feed of the spindle only. A carriage feed selector lever p is mounted in the frame. The indicating board, shown in Fig. 7 as applied to a boring and surfacing machine, has spindle rotation arrows 7, 71 and, for each movable part, two arrows such as LT, L1T, showing their direction of movement; a diagonal line divides the diagram into two parts, the arrows in the upper part indicating movements away from the operator and those in the lower part indicating movements towards the operator. Also on the indicator board are forward and reverse switches 1, 1<SP>1</SP>, controlling the driving motor M and a stop switch 2. In operation, as applied to a horizontal boring machine, the switch 1 or 1<SP>1</SP> is closed, closing either of the relays AV, AR, Fig. 5, and starting the motor and also closing a contact 5 or 5<SP>1</SP> so that the appropriate lamp LAV or LAR behind the arrow 7 or 7<SP>1</SP> is illuminated by current from a transformer 6 which also supplies the other indicating lamps. The lever f is then operated and through a projection 10, causes a sliding gear B10 either to mesh directly with a gear E10 or, through reversing gears E12, E11, to rotate a shaft A 10 for forward or reverse feed; all the lamps above the diagonal or all those below are provided with current by the action of a cam fc on contacts CC or C1C. Feed of either the spindle or the carriages is then selected by means of the lever e which through a projection 20 displaces a sliding gear E20 on the shaft A10 to engage a gear E21 to provide for feed of the spindle or to engage a gear E22 driving the carriages by means of shafts All, A12. A cam ec on the lever e operates a contact CB illuminating one of the lamps LB or L1B corresponding to the spindle, or three of the six lamps corresponding to the carriages. If the spindle is to be fed, the clutch connected to the hand wheel j is engaged, thus driving the spindle rack and illuminating a lamp LE on the carriage by the action of a cam Kj on a contact Cj. If a carriage is to be selected, the lever p is moved either vertically to engage by means of lever PL a sliding gear B5 which actuates a shaft LV feeding the spindle carriage or horizontally to right or left to engage by means of an arm bp, Fig. 8, a sliding gear B6 actuating the shaft LL for longitudinal displacement of the carriage T or the shaft LT for transverse displacement of the table P. Movement of the lever p actuates contacts CL, CT or CV by means of cams Cp and a cone Rp so that only one arrow corresponding to the part to be displaced remains illuminated. Finally, either slow or rapid feed is selected by the lever g which moves a sliding gear B30 to engage gears E30 and E31 or E32 and E33 respectively, or, if hand-operated feed is required, to engage the gear E30 with a gear E37 on a shaft rotatable by the hand wheel i. In any selected position, the lever g can be moved downwards, acting on a switch CS and stopping the motor. As applied to a boring and facing machine having a facing plate PS, Fig. 8, and facing slide CS, the levers p, f and g operate as previously described; the lever p controls the lamps through contacts CLV, CLT and CLL and the lever f through contacts CSA1, CSA2 and the lever g controls a motor switch. The lever e can be moved into four positions, the first two positions corresponding, as before, to feed of the spindle or of the carriages; the third position engages the gear E20 w th the gear E23 to feed the facing slide by means of the shaft A14 and gear E39; and the fourth position engages the gear E20 with both the gears E23 and E21 to provide the facing slide and spindle feed simultaneously. A cam plate is fitted on the lever e and, according to the position of the lever, closes a contact CLPB in the lamp circuit for the spindle feed, a contact CLVT corresponding to the carriage feeds, a contact CLP corresponding to the facing slide or closes the two contacts CLPB and CLP simultaneously. The spindle rack has a groove r1 engaging a member d1 operating a contact CLTP which, when the spindle is moved out, lights a lamp to indicate that there is danger of the spindle and facing slide contacting each other; when the spindle is retracted, the lamp is extinguished by the action of a slope r2 at the end of the groove. The lamp is mounted under the indicating board Ti and replaces the lamp LE that previously indicated that the spindle was in operation. Another groove s in the spindle rack operates a contact CSB to switch off the motor when the spindle reaches either extremity of its travel.