Patent GB-647750-A (GB)
Title: Improved method of, and apparatus for, welding metallic tips to metallic bases
Inventor: TUCKER NORMAN ALBERT
IPC: B23K11/00
Filed: 1948-01-28
Abstract: 647,750. Making pens. JOHNSON, MATTHEY, & CO., Ltd. Jan. 28, 1948, Nos. 2556/48 and 299/49. [Classes 83 (ii) and 83 (iv)] Electric welding. - In welding metallic tips to pen nibs or other metallic bases a rotary carrier intermittently feeds the bases to a position where a tip applied to a base and welded thereto and the completed base is then carried to an ejecting position. Transferring blanks. A carrier 10 with pivoted clamping jaw 70 is rotated by a ratchet lever 19 from a crank 20 on a shaft 9 rotated by an electromotor 2. The clamps are closed by springs and opened by a fixed cam 75. Nibs are loaded singly by hand into the carrier clamps at position P. The carrier is locked by a finger on a rod 105 withdrawn by a cam 114 against the pressure of a spring 108. Tip feeding. The tips 23 on a hopper 24 are extracted singly by a grooved-top plunger 27 raised by a cam 21 on shaft 9 and fed to a shoot 37 until stopped by a cup. An apertured slide 36 controls the feed. A cup 25 for holding the tip is carried on an arm 43 pivoted to a hinged yoke 40 raised by springs 45 and lowered by a cam 23 through a lever 52. The cup arm 43 carries a slotted extension 53 which locks under a stop 54 to prevent the cup from rising and swings a lever 56 to operate the shutter 36 of the tip delivery mechanism. The cup consists of a concave supporting member 115 with a cover 118 under which a supply of hydrogen controlled by a valve operated by a cam 120 on a shaft 6 is supplied. Cup centring. To align the cup 25 with the nib the arm 43 in lowered position is positively displaced from the centre position to the right, Fig. 2, by a cam 87, Fig. 5, through a lever 89 and then positively displaced before the next upward movement to the left and accurately centred by a cam 92 through lever 93 coupled to a rod 96 with adjustable head 102 which engages the nib. A transformer 126 secondary is connected to the yoke 40 and to the frame of the machine. The primary is in series with a rheostat 127 and fixed and adjustable contactbreakers 128, 129, the latter being adjustable to vary the time the welding circuit is closed by a knob 131 on a shaft 132. Nib ejector means. A pivoted clamp 79 on an arm 77 is raised by a cam 84 on a driven shaft against the pressure of a spring 85. The clamp is closed by a leaf-spring and opened by a fixed abutment. Operation. A tip 23 is placed by hand in the cup 25 and a nib in the clamp at position P and switches 124, 130 are closed. The electromotor 2 rotates the shaft 9 and cam 92 withdraws the locking-rod 108. The yoke 40 is swung downwards by cam 23 to lower the cup which is displaced laterally by cam 87. The ratchet mechanism rotates the carrier sixty degrees clockwise, Fig. 2, and the nibcarrying clamp is moved to position A and the clamp closes when the jaw rides off the fixed cam 75. The cup centring rod 96 is moved forward by spring 99 but as no nib is in the clamp 66, 70 the cup and arm 43 are displaced beyond the centre until the arm 53 engages beneath the stop 54 to prevent the arm 53 and the cup from rising. During the movement of the carrier 10 the cam 84 is positioned to allow arm 77 and withdrawing-jaws 79, 80 to drop and grip a nib when one is present. The cam 21 raises plunger 27 to lift one nib and expel it through outlet 36 when opened by the slide moving to the centre position. On continued rotation of the shafts 6, 9 and whilst the carrier is stationary, cam 87 displaces cup 25. The carrier is then rotated another sixty degrees to bring the nib to position B and the sequence is repeated. When the carrier brings the nib to position C above the cup 25 the nib contacts the finger 102 to position the cup beneath the nib axis. The yoke 40 rises and a tip in the cup contacts the nib. The welding circuit switch 130 and the contact breakers 128, 129 are in closed position and the tip is welded. Continued rotation of the electromotor 2 opens circuit-breakers 128, 129. When the carrier reaches position E the jaw is opened by cam 75 and the jaws 79 take the nib from the carrier. One jaw rides over the pin 80b on the retraction movement and the nib falls to a shoot 86. Specification 647,758 is referred to.