| 摘要 |
PURPOSE:To prevent the abrasion of the engaging part of a platen with a frame at the time of the mounting/detaching of the platen, by fixing a metal body to the arm part protruding from a cylindrical bearing main body to expose a part thereof and fixing a platen bearing by the engagement of the exposed part with the frame. CONSTITUTION:In use, platen bearings 3, 4 are placed in the receiving grooves 2A, 2A on both sides of a frame 2 along with a platen 1 at first and the knob parts 3F, 4F of the bearings 3, 4 are rotated to the left when looked in an X-direction and the peripheral edge parts of the receiving grooves 2A, 2A of the frame 2 are held between the projections 3D, 3E and 4D, 4E of the bearings 3, 4 to obtain a midway state prescribing only the left and right positions of the platen 1. When the bearings 3, 4 are further rotated in the same direction, the spring pins (metal bodies) 5, 5 fixed to the bearings 3, 4 get over edge parts 2B, 2B to move in pin engaging grooves 2C, 2C to be set thereto and the mounting of the platen 1 is finished. When the bearings 3, 4 are detached from the frame 2 at the time of detaching the platen 1, the operation reverse to that at the time of the aforementioned mounting may be performed. |
