Abstract: A double-feed prevention device in paper feeding apparatus is provided with a paper feeding roller and a frictional member carried on a paper separating plate mounted on an end of a spring-biased swingable lever. Paper sheets are separated one by one at a gap having a predetermined dimension between the paper feeding roller and the frictional member. A part of the swingable lever is always engaged by a locking member so as to prevent separation of said frictional member from said paper feeding roller by wear off in a surface of said paper feeding roller. The double-feed prevention device according to the present invention is further provided with releasing means for disengaging between the locking member and the swingable lever to remove jammed paper from the gap as desired.

Abstract: Disclosed herein is a method of manufacturing a base steel sheet, which method comprises combined steps of: not rolling a steel slab containing not more than 0.0070% by weight of C (hereinafter referred to briefly as "%"), not more than 0.1% of Si, not more than 0.5% of Mn, 0.010 to 0.080% of Al, not more than 0.0050% of N, not more than 0.030% of S provided that the ratio of Mn/S is not less than 10, and not more than 0.030% of P while the hot rolling being terminated at a finish temperature of not less than 800.degree. C.; cold rolling thus obtained hot rolled steel sheet in an ordinary manner; continuously annealing the cold rolled steel sheet in which heating is done up to a temperature from a recrystallization temperature to 800.degree. C.