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Automatic sheet feeding device
| Details |
Inventors: Saiki, Eisaku; Kawauchi, Masataka;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Kashnikow; Andres
Assistant Examiner: Graham; Matthew C.
Attorney, Agent or Firm: Antonelli, Terry & Wands
An automatic sheet feeding device for feeding sheets of low rigidity and high coefficient of friction, such as documents of small thickness and thin sheets with carbon backing, including feeding rollers, separating rollers, a rotating mechanism for rotating the separating rollers, and a regulating mechanism for regulating a torque applied to the separating rollers. A torque tending to rotate the separating rollers in a direction in which the sheets are fed is applied thereto by the feeding rollers, and a torque tending to rotate the separating rollers in a direction opposite the direction in which the sheets are fed is applied thereto by the separating roller rotating mechanism through the regulating mechanism for regulating the torque applied to the separating rollers which is a friction clutch. By adjusting the torque transmitting force of the friction clutch, one of the two torques is selectively applied to the separating rollers depending on whether or not the sheets are held between the feeding rollers and separating rollers. |
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DETAILED DESCRIPTION This invention has as one of its objects the provision of an automatic sheet feeding device of high reliability in performance capable of separating and feeding with high reliability those sheets which are high in the coefficient of friction, such as documents of small thickness or thin sheets with carbon backing.
Another object is to provide an automatic sheet feeding device of high reliability in performance capable of separating and feeding with high reliability those sheets which are high in the coefficient of friction and which tend to stain rollers and other parts, such as thin sheets with carbon backing.
According to the invention, there is provided an automatic sheet feeding device for successively feeding one sheet after another from a stack of sheets by separating them, comprising feeding means for feeding one sheet after another from the stack of sheets, separating means for separating the stack of sheets into individual sheets, torque regulating means for regulating a torque applied to the separating means, and rotating means for rotating the separating means through the torque regulating means, wherein the separating means is maintained in engagement with the rotating means and feeding means in such a manner that the separating means can be rotated freely in a direction in which the sheets are fed and in a direction opposite the direction in which the sheets are fed.
Also, in the automatic sheet feeding device of the aforesaid construction according to the invention, the separating means has a coefficient of friction with respect to the sheets which is selected to be lower than the coefficient of friction of the feeding means with respect to the sheets and higher than the coefficient of friction of one of the sheets with respect to another sheet.
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