JP2549377B2 - Electrostatic copier - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a copying machine having an automatic document feeder.

2. Description of the Related Art Conventionally, as this type of copying machine, for example, the one shown in FIG. 5 is known. In this copying machine, when an ADF (automatic document feed) is used, a document 2 placed on a document receiver 1 is separated one by one by a document separating unit 3 and a document registration roller 23 driven via an electromagnetic clutch or the like (not shown).
The tip comes into contact with. Thereafter, the document registration roller 23 rotates at a predetermined timing, and the document 2
Then, the intermediate belt 4 feeds the document onto the document placing table 6, and the transport belt 5 feeds it to a predetermined position on the document placing table 6 and stops. The document 2 is discharged onto a document discharge tray 24 by the transport belt 5 after exposure. Document loading table 6
In the lower part of the table, while the document 2 is stopped, the first optical scanner 7 has a predetermined speed v and the second optical scanner 8 has a speed v / 2.
The document 2 is moved by a driving member (not shown), and the image of the document 2 is exposed to the photosensitive drum 14 via the first mirror 9, the second mirror 10, the third mirror 11, the lens 12, and the fourth mirror 13. The transfer paper 16 on the paper feed table 15 is conveyed toward the photoconductor drum 14 by the paper feed roller 17, and after the image on the photoconductor drum 14 is transferred by the transfer charger 18, it is separated by the separation charger 19, After the image is fixed by the fixing roller 20, the sheet is discharged onto a sheet discharge tray 21. A transfer paper registration roller 22 driven via an electromagnetic clutch or the like (not shown) is provided on the upstream side of the transfer section. The paper is fed at a timing that matches the leading edge timing of.

However, in the conventional apparatus as described above, when the ADF is used, the slit exposure must be started after the original 2 has been completely sent to the original mounting table 6 and stopped, as described above. There was a problem.

To deal with this, when using the ADF, the first optical scanner 7 having the exposure lamp 31 is fixed in the middle of the document table 6 as shown in FIG. Also, the original 2 fed by the intermediate belt 4 is conveyed by the conveying belt 5 at a predetermined constant speed v (the same as the peripheral speed of the drum 14 when copying is the same size), and exposure is performed only by moving the original 2. Some have been designed to improve speed (sheet-through method).

However, in this case, not only is a device for locking the first optical scanner 7 in the middle of the document table 6 necessary, but also the exposure is performed by the exposure lamp 31 while the first optical scanner 7 is fixed. The temperature rises,
Therefore, there is a disadvantage that the cooling fan 30 and the like are required.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a copying machine capable of improving the copying speed without requiring a lock device for an optical scanner, a cooling fan, and the like. And

Configuration To achieve the above object, the present invention includes a document registration roller that adjusts the timing of feeding a document, a feeding member that feeds the document to the document mounting table, and a document that is fed by the feeding member. In an electrostatic copying machine including a transport member that transports on a mounting table, an optical member that moves below the document mounting table to perform slit exposure on a document, and a transfer paper registration roller that adjusts the transfer timing of the transfer paper. A position detection member for detecting the position of the optical member is provided in the movement path of the optical member, and after the lapse of a predetermined time after the movement of the optical member is started in synchronization with the operation start of the conveyance member, the position detection member Based on the detection signal, the document registration roller and the transfer sheet registration roller are operated, and while the document is moved at a constant speed by the transport member, it is in the opposite direction to the transport direction. It is characterized in that a control device for moving the optical member in a predetermined direction at a constant speed is provided.

 An embodiment shown in the drawings will be described below.

As shown in FIG. 1, the copying machine according to the present invention includes the same constituent members as the conventional one (FIG. 5), and those members are denoted by the same reference numerals.

The original 2 is fed in table 6 holding the document by the document registration roller 23 and the intermediate belt 4 in the present invention, while transporting at a constant speed v ₁ by the conveyor belt 5, a direction opposite to the conveying direction of the first optical scanner 7 it is intended to be exposed by moving at a constant speed v ₂ to. At this time, the peripheral speed of the photosensitive drum 14 is controlled to be v ₁ + v ₂ = v in the case of copying at the same size. The operations of the transport belt 5 and the first optical scanner 7 are controlled by a control device (not shown).
As described above, the original 2 and the first optical scanner 7 are v ₁ + v ₂
, The copy speed is increased, and the first scanner 7 is not fixed. Therefore, a lock device for the first scanner 7 is unnecessary, and there is no temperature rise and no cooling fan is required. Becomes

In the above-described method, in order to prevent the positional deviation of the image obtained on the transfer paper 16, the operation timings of the original registration roller 23 and the transfer paper registration roller 22 must be adjusted.

For this reason, according to the present invention, the home sensor is further provided near the starting end position in the movement path of the first optical scanner 7.
32 is provided, as shown in FIG. 2, this home sensor
A signal is output when the detection plate 33 of the first optical scanner 7 passes through 32. This home sensor 32
As shown in FIG. 4, the output signal of is input to the microcomputer unit 36 through the input / output interface 35, and based on this signal, the electromagnetic magnet clutches 2 of the original registration roller 23 and the transfer paper registration roller 22 are respectively.
The operation of 3 ', 22' is controlled. That is, as shown in FIG. 3, the print button is turned on, the first and second optical scanners 7 and 8 are driven, and the conveyor belt 5 is driven, and then the home sensor 32 detects the first optical scanner 7. Then, the document registration roller 23 operates after a lapse of a predetermined time Ams after the detection, and the transfer paper registration roller 22 operates after a predetermined time Bms after the detection. In this way, the document registration roller 23 and the transfer paper registration roller 22 operate at a predetermined timing, so that an appropriate copy without misalignment of the image can be obtained.

Effect As described above, according to the present invention, the slit exposure is performed by moving the optical member in the direction opposite to the conveying direction while conveying the original at a constant speed, so that the copy speed can be improved, In addition, a lock device, a cooling fan, and the like for the conventional optical member are not required, and the device can be manufactured at low cost. Further, a position detection member that detects the position of the optical member is provided in the movement path of the optical member, and after a predetermined time has elapsed after the movement of the optical member started in synchronization with the operation start of the conveyance member, the detection signal of the position detection member Based on the above, since the original registration roller and the transfer paper registration roller are operated, the original registration roller and the transfer paper registration roller are operated after the moving speed of the conveying member and the optical member is stabilized, and an image is formed. There is an effect that an appropriate copy without misalignment can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of the inside of a copying machine showing an embodiment of the present invention, FIG. 2 is a perspective view showing a home sensor, FIG. 3 is a time chart of a control device, and FIG. Is a block diagram of the control device, and FIGS. 5 and 6 are front views showing a conventional example. 2 ... Original, 5 ... Conveying belt 6 ... Original platen 7 ... First optical scanner 8 ... Second optical scanner 14 ... Photosensitive drum, 16 ... Transfer paper 22 ... Transfer paper registration roller 23 ...... Document registration roller 32 …… Home sensor

Claims (1)

(57) [Claims] 1. A feeding member that includes a document registration roller that adjusts the timing of feeding a document, and feeds the document to the document placing table; and the document fed by the feeding member is conveyed on the document placing table. A transport member for moving the document, and an optical member that moves below the document table and performs slit exposure on the document,
In an electrostatic copying machine provided with a transfer paper registration roller for adjusting the transfer timing of the transfer paper, a position detection member for detecting the position of the optical member is provided in the moving path of the optical member to start the operation of the transfer member. After a predetermined time has elapsed after the optical members started to move synchronously, the original registration roller and the transfer paper registration roller are operated based on the detection signal of the position detection member, and the original is moved at a constant speed by the conveyance member. An electrostatic copying machine provided with a control device for moving an optical member at a constant speed in a direction opposite to a conveying direction while moving the optical member.