Patent GB-807075-A (GB)
Title: Apparatus for the manufacture of glass cathode ray tubes
Inventor: STUTSKE WILLIAM ALBERT
IPC: H01J9/46
Filed: 1956-09-21
Abstract: 807,075. Making cathode ray tubes. OWENS-ILLINOIS GLASS CO. Sept. 21, 1956, No. 28868/56. Class 39(2) [Also in Group II] Apparatus for inserting anode buttons into the apertured walls of cathode ray tubes brought successively to an inserting station comprises a reciprocating button pick-up device 10, Figs. 1 and 3, mounted above a position into which a tube is carried by the apparatus, and a button supply carrier 20 which is movable to and from a button-presenting position intermediate the pick-up device and a cathode ray tube so that when the carrier is in the presenting or inner position the pick-up device is lowered to remove a button therefrom, whereupon the carrier is retracted to its outer position and the pick-up device is reciprocated first downwardly to deposit the button in the aperture in the tube and then upwardly to clear the delivery position for the next inward movement of the button supply carrier. The button supply carrier comprises a disc 20, Fig. 1, with a plurality of sockets 20a around its periphery into which metal anode buttons b are placed preparatory to feeding them to the cathode ray tubes which are mounted on a rotary indexing table or the like. The disc 20 is secured on the upper end of a shaft 21 which is mounted freely in a vertical sleeve 22 provided with two integral arms 23, 24 projecting laterally therefrom, the arm 24 being longer than arm 23 and mounted on a fixed pivot 25 on the machine frame. The arm 23 is pivotally connected to the outer end of a plunger which operates within a cylinder 26 pivotally mounted on a fixed bracket 27, so that admission of compressed air into the cylinder 26 causes the disc 20 to be swung to and fro between the positions shown respectively in full lines and broken lines in Fig. 1. The swinging movement of the carrier disc also produces a rotary indexing movement of the button carrier 20 about its own axis by means of a pawl and ratchet device, Fig. 4, comprising an indexing gear wheel 28 secured on the shaft 21 and engaged by a spring-biased pawl 32 pivoted on an arm 29 which is loosely pivoted on shaft 21 and connected by a link 30 to a fixed pivot 31. A detent pin 34 on a spring-biased lever 35 pivoted on the arm 24 supporting the carrier 20 ensures accurate positioning of the latter. The pawl 32 rides over the gear wheel 28 during clockwise rotation of the arm 24, and pushes against a tooth of the sector during anti-clockwise rotation of the arm, thereby rotating the carrier disc 20 so that a button will be below a vacuum head 12 in the button pick-up device 10 at the completion of the next inward movement of the carrier disc. The vacuum head 12 is carried at the lower end of a rod 13, Fig. 3, which is movable within guides in a tubular body 15 and pressed downwardly by a coil spring 16. The tubular body 15 is movable vertically in a guide 17, being connected by a cross-arm 19 to a plunger operating within a cylinder 18' that can be connected to a source of pressure fluid. A lateral channel is provided in the vacuum head 12 to connect it to a vacuum source at timed intervals. Cylinder 18 is operative to lower the head 12 on to a button disposed below it, whereupon suction is applied to seize and hold the button while the carrier disc 20 is retracted, and the vacuum head 12 is again lowered by actuation of cylinder 18 so that the button is deposited in the opening in the previously heatsoftened part of the wall of the cathode ray tube, under the pressure of the spring 16, the vacuum being cut off to release the button from the head 12.