Paper feeder

Inactive Publication Date: 2006-07-06
PFU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] According to the sheet feeding apparatus of the present invention, the output value of the receiving element of the ultrasonic sensor is adjusted either by altering the reference voltage of the operational amplifier or altering the frequency of clocks supplied by the drive circuit or the duty ratio. Therefore, at the time of shipping the sheet feeding apparatus, for example, t

Problems solved by technology

Moreover, readjustment is needed when ultrasonic sensor has run into trouble and is to be replaced.
Further, in a case that the control is such as to determine the decision slice value uniquely, it is difficult to secure a sufficient margin of operation against variations in the ultra

Method used

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Embodiment Construction

[0027]FIG. 1 and FIG. 2 are structural diagrams of a scanner, showing the schematic structure of a scanner to which a sheet feeding apparatus according to the present invention is applied. Particularly, FIG. 1 shows an external view of the scanner, and FIG. 2 shows a schematic section of a scanner.

[0028] This scanner is formed integrally with the sheet feeding apparatus. The sheet feeding apparatus, as shown in FIG. 2, comprises a paper sheet mounting table (shooter) 31, a pick roller 32, a pick arm 33, a separating pad 34, feed rollers 35 and 36, and discharge rollers 37 and 38. And, the sheet feeding apparatus further comprises the sending element of the ultrasonic sensor 17 and the receiving element of the ultrasonic sensor 18 of an ultrasonic detector 1 to be described afterwards. In FIG. 2, the two-dot chain line represents the transfer path of paper sheets 100 and the arrow R represents the reading position of the paper sheets 100.

[0029] The paper sheets 100 mounted on the p...

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Abstract

A sheet feeding apparatus includes a sending element of an ultrasonic sensor for outputting ultrasonic waves, a drive circuit for supplying the sending element of the ultrasonic sensor with a drive signal for driving the sending element, a receiving element of the ultrasonic sensor disposed opposite the sending element of the ultrasonic sensor across a sheet transfer path in the sheet feeding apparatus, and for receiving the ultrasonic waves, a setting unit for setting a threshold for the detection of transfer of the plurality of paper sheets by using the output of the receiving element of the ultrasonic sensor at the time of stopping of the output of the sending element of the ultrasonic sensor as a basic value, and a detection unit for detecting transfer of the plurality of paper sheets by comparing the output of the receiving element of the ultrasonic sensor with the threshold.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention generally relates to a sheet feeding apparatus, and particularly to a sheet feeding apparatus which sets a threshold that enables, in double feed detection using ultrasonic waves, the double feed to be detected without fail even in a case that the sensor output is varied by fluctuations in the sensitivity or sound pressure of the ultrasonic sensor and the like. [0003] 2. Description of the Related Art [0004] For use in the front shield device of a sheet-fed press, for example, an ultrasonic detector is known, which detects the transfer or feeding of a plurality of (for example, two) paper sheets (double feed or DF) by using ultrasonic waves. In this ultrasonic detector, ultrasonic waves outputted from a sending element of an ultrasonic sensor are received by a receiving element of the ultrasonic sensor, and it is detected whether there is one fed paper sheet or more according to the level (wave height...

Claims

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Application Information

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IPC IPC(8): B65H7/02B41J11/42B65H7/12G03G15/00
CPCB65H7/125B65H2553/30
Inventor TAGAWA, YOSHIYASUWAKAURA, TOMOMIMIYAZAKI, KATSUTOSHI
Owner PFU LTD
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