| 摘要 |
802,699. Automatic extrusion control. WRIGLEY, Jun. CO., W. Feb. 7, 1956 [June 24, 1955], No. 3758/56. Class 38 (4). In a machine wherein a plastic material such as chewing gum is extruded from a kneading machine 10, Fig. 1, in a partial loop 12 to a further machine having driven rollers 14, 15, and the speed of extrusion is controlled by a mechanical variable speed mechanism 24 through a reversible servomotor 26 in response to the movement of a feeler 20 of a switch-box 18, power is fed from an A.C. source 28, 29, Fig. 2, to the windings 39, 40 of the motor through a timer T which connects the power for 4¢ seconds in each 20 seconds and selector switches A, B, C. Switch A which is a normally open, single-pole, double-throw switch is actuated by the paddle 20, Fig. 3, through a cam 57 on a shaft 19 and a leaf-spring 62, and contacts B or C are closed by a head 65 of an operating arm 64. The operating arm is located on shaft 19 by friction so that excessive movement of the arm in response to a large paddle movement is prevented by screws 80, 82 on arms of a yoke 77 engaging a rear extension 69.
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