| 摘要 |
PCT No. PCT/US89/00766 Sec. 371 Date Jan. 17, 1990 Sec. 102(e) Date Jan. 17, 1990 PCT Filed Feb. 27, 1989 PCT Pub. No. WO89/08068 PCT Pub. Date Sep. 8, 1989.A multiple document detector uses a driven wheel (40) opposed by an idler wheel (44) on a castoring arm (60). The wheels (40,44) each have a coefficient of friction against a document greater than the coefficient of friction of a document against another document. When a sensor (14A,14B) senses the presence of a document (26) a solenoid (70) operates to attract a magnetic slug (58). If only one document (26) is present the idler wheel (44) stays in a preferred position. If two documents are present the solenoid (70) has sufficient force to cause the idler wheel (44) to push one document (26) to slide against another. In doing so the movement of the idler wheel (44) is detected by a microswitch (18) which signals the presence of multiple documents. |
