Production device null of shinai ruler for steel-frame processing

摘要

PURPOSE:To feed a band steel under a constant contact pressure at which a slip hardly occurs by a method wherein a plurality of tension pulleys are radially arranged and brought into pressure adhesion to the outer periphery of a reel type drive roller through their own spring pressures. CONSTITUTION:A band steel unreeled from the band steel feed reel 33 of a band steel feed mechanism part 30 is fed to a feed drive part 34 through an upper mark forming device 35 after the passage of it through a guide pulley 48 having a detecting sensor. The band steel is wound around a drive roller 40 at a high angle enough for contact with approximately the half peripheral surface of a drive roller 40 from the band steel introduction side A. With this state, the band steel is nipped by means of a plurality of tension pulleys 41a-41n on which pressures by respective springs are applied and a given drive force is exerted. Thereafter, on the band steel feed side B, the band steel is wound around a band steel winding reel 36 after the passage of it through the same guide pulley with a detecting sensor as the guide pulley 48.