| 摘要 |
PURPOSE:To reduce manufacturing cost by providing a device with a conduction detecting section coming in contact with the rotating surface of the mounting section of a work tool and with an emergency suspending means which automatically suspends the drive of the operating system for the work tool when the work tool comes in contact with the core material by switching to conductive state via said conduction detecting section. CONSTITUTION:If a cutter 10 excessively cuts the resin 9b of a model forming body 9 till it comes in contact with a steel frame 9a, a closed circuit consisting of a conducting arm and an earth which is composed of a power supply terminal 22a, a coil 21a, a lead wire 19; the steel frame 9a, the cutter 10, a chuck 13 and of a conduction detecting section 16 is formed so that a normally closed contact 21b is opened by energizing the coil 21a so as to let electric current to a driving mechanism 15 be interrupted. As a result, the operation of the cutter 10 is suspended for preventing a worse condition wherein the cutter is broken and the like. In addition, which situation eliminates the need for the replacement of relative members such as an arm and the like. |
