| 摘要 |
1,082,244. Embossing. COURTAULDS Ltd. May 26, 1964 [May 27, 1963], No. 21037/63. Heading B3Q. Apparatus for indenting a spinning jet comprises a rotatable jet blank holder, an anvil for supporting the blank diaphragm, means to stepwise rotate the holder and anvil about an axis perpendicular to the anvil surface through one revolution, control means for sensing the number of steps, a chuck for holding a punch with its axis parallel to that of the holder, the operative punch end being spaced from the anvil surface to clear the diaphragm thereon, the chuck being movable laterally of the axis to traverse a punch held therein between the axis and periphery of the anvil, chuck locating means and actuating means for effecting relative movement between the anvil and chuck to indent the diaphragm. An indexing head 31 comprises a turret 4 mounted on a motor-driven spindle 32 and carrying at least one chuck 2. The turret is located by a spherical ended member 5, Fig. 2, mounted on an arm 6, pivoted at 8 on a plate 9 which is adjustably pivoted at 10 to the head, and is actuated by pneumatic cylinder means 7 to engage a grooved block 1 mounted on the turret. A pointer (not shown) indicates the position of the plate 9 and hence the radial distance of the punch 26 from the holder axis on a scale and a cam and follower 40 indicates when one circle of indentations have been made so that the plate 9 is reset for the subsequent circles. The punch 26 is clamped in a holder part (78, Fig. 4, not shown), of the chuck secured to a spindle (22) axially adjustable in a body (21) by a screwed ring (80) engaging a screwed portion of the spindle. The upper headed end of the body 21 is located for radial and circumferential adjustment in the turret and clamped in the required position by member 14. The workholder (17, Fig. 5, not shown), comprises an anvil (45), having a sleeve (46) into which a jet blank (47) is fitted, mounted on an axially slidable spindle (41) mounted in a sleeve (43) intermittently driven by a motor and gear chain including a rotary potentiometer which in conjunction with a chain of resistors is used to index the sleeve between each indenting stroke of the spindle. The total resistance of the chain is such that after one revolution of the sleeve the potentiometer is balanced. The spindle (41) is downwardly biased by a spring and raised by a two-stage pneumatic means (55) comprising a cylinder (19) housing a piston (18) in which is slidable a rod (57) which engages a foot member (68) at the lower end of the spindle and also contacts an internal diaphragm (11) supported by the bottom surface of a cavity (58) in the piston. Air supplied to the piston by a connector (64) raises it to a first stage position in which the diaphragm (48) in the holder is just clear of the punch and the spindle (41) can be rotatably indexed without interference from the rod (57). The holder assembly is maintained in this position during the forming of a complete ring of indentations after which it is lowered and the punch re-positioned. To effect indentation of the diaphragm (48) the holder is further raised through a second stage after each index by air pressure from a nipple (62) which raises the piston diaphragm (11), the rod (57) and holder-assembly to impinge the diaphragm against the punch. To facilitate setting up, the spindle (41) can be manually raised by means of a hand wheel (25) and pivoted linkage (76), (77) engaging the foot (68). The relationship of the blank diaphragm and punch are observed through a microscope. To enable the positioning of the arm (6), which locates the turret, to be programmed the plate 9 is driven by a motor 87, Fig. 2, through a gear train engaging teeth on the periphery 85 thereof in conjunction with a potentiometer 90 and a chain of resistances which control the energizing of the motor. The operational sequence of the machine is controlled by a programming device (not shown) in conjunction with a plurality of cams and switches. |
