JPH034145U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the configuration of the paper feed section of the ADF of the present invention, FIG. 2 is a perspective view showing an example of the configuration of the document thickness detection means, and FIGS. 3, 4, and 5 are FIG. 6 is a sectional view showing an example of the overall configuration of a conventional ADF, and FIG. 7 is a sectional view showing the configuration of its paper feed section. It is. A... Conveying section, B... Paper feeding section, C... Reversing section,
D... Original paper thickness measuring section (original thickness detection means), 1
...Copy machine body, 2...Contact glass, 3...
...Document mounting table, 7...Separation belt, 8...Separation roller, 9...Pulse encoder (pulse generation means)
, 11...Registration sensor, 12...Document scale, 14...Endless belt, 19...Document,
20, 30...Conveyance roller, 21...Minute displacement detection sensor, 31, 32...Metal roller.

Claims (1)

[Scope of claim for utility model registration] (1) Separating and feeding originals one by one from a stack of originals, and positioning the originals at a reference position on the contact glass using an endless belt that covers the contact glass of a copying machine. This is an automatic document feeder that conveys the document, stops it, performs exposure, and discharges the document from above the contact glass after exposure.A servo motor is used as the drive device for the endless belt, and the amount of movement of the endless belt It has a pulse generating means that generates pulses to be compared, and a registration sensor that is provided on the document conveyance path onto the contact glass and detects the leading edge or trailing edge of the document, and after the edge of the document is detected by the registration sensor, from the position of the registration sensor. A non-contact mode in which the belt is stopped after the servo motor is rotated by the number of pulses corresponding to the distance to the document reference position, and the document is stopped at the reference position, and the registration sensor position is determined after the edge of the document is detected by the registration sensor. The servo motor is rotated by a number of pulses greater than the number of pulses corresponding to the distance from There are two types: a collision mode in which the motor is rotated in reverse by the number of pulses corresponding to a distance slightly larger than the distance from the document position to the reference position, and the belt is stopped after the edge of the document hits the scale at the reference position. In a device with a document placement mode of Automatic document feeding characterized by having a control means that automatically selects a non-butting mode when the detected thickness is smaller than a set value, and selects a butting mode when the detected thickness is greater than the set value. Device. (2) Separate and feed originals one by one from a stack of originals, transport the originals to a reference position on the contact glass using an endless belt provided over the contact glass of the copying machine, stop, and perform exposure. , an automatic document feeder that ejects the document from above the contact glass after completion of exposure, in which a servo motor is used as a drive device for the endless belt, and a pulse generator that generates a pulse that is compared to the amount of movement of the endless belt. means and a registration sensor that is provided in the document conveyance path onto the contact glass and detects the leading edge or trailing edge of the document, and corresponds to the distance from the registration sensor position to the document reference position after the document edge is detected by the registration sensor. The servo motor is rotated by a number of pulses greater than the number of pulses to transport the original beyond the reference position, and after stopping, the distance from the original position on the contact glass to the reference position detected by the pulse generating means is In a system that rotates the motor in the reverse direction by the number of pulses corresponding to a larger distance and stops the belt after the edge of the document hits the scale at the reference position, the document thickness is detected upstream of the registration sensor in the document feed path. The detected document thickness is compared with a preset value, and if the detected thickness is greater than or equal to the set value, the contact amount is set to the normal value, and the detected thickness is set to the set value. An automatic document feeder characterized in that it has a control means that automatically switches the abutment amount to a constant value smaller than the normal value when the abutment amount is smaller than the normal value. (3) Separate and feed originals one by one from a stack of originals, transport the originals to a reference position on the contact glass using an endless belt provided over the contact glass of the copying machine, stop and expose the originals. , an automatic document feeder that ejects the document from above the contact glass after completion of exposure, in which a servo motor is used as a drive device for the endless belt, and a pulse generator that generates a pulse that is compared to the amount of movement of the endless belt. means and a registration sensor that is provided in the document conveyance path onto the contact glass and detects the leading edge or trailing edge of the document, and corresponds to the distance from the registration sensor position to the document reference position after the document edge is detected by the registration sensor. The servo motor is rotated by a number of pulses greater than the number of pulses to transport the original beyond the reference position, and after stopping, the distance from the original position on the contact glass to the reference position detected by the pulse generating means is In a system that rotates the motor in reverse by the number of pulses corresponding to a larger distance and stops the belt after the edge of the document hits the scale at the reference position, the document thickness is detected upstream of the registration sensor in the document feed path. Based on the thickness of the detected document, the document abutment amount is calculated as a function of the document thickness so that the document abutment amount increases as the document thickness increases. An automatic document feeder characterized in that it is provided with a control means for controlling the amount.