| 摘要 |
PURPOSE:To reduce production cost by miniaturizing a control board, by a method wherein a cylindrical safety door surrounding a mold is mounted rotatably, a plurality of cams is provided on the external surface of the safety door along a rotating direction and contact points each of limit switches provided by confronting with the cams of the safety door are connected to a sequence control circuit. CONSTITUTION:A cylindrical safety door 20 is arranged rotatably between a base stand 1 and stationary plate 6 through a bearing. A plurality of cams 22 is provided on an external circumferential part of the safety door 20 in a protruded state along a rotating direction, limit switches LS2-LS10 which are obtained by arranging each of action pieces on loci of the cams 22 are fitted to the base stand 1 through a fitting frame 23 and the limit switches LS2-LS10 are made to act in an aged state in order through a rotation of the safety door 20. Each of contact points are connected with a sequence control circuit and the contact points of the above limit switches LS1-LS12 are connected in series with solenoid switches and solenoids SOL1-SOL7. |
