JPS63249834A - Electrostatic copying machine - Google Patents

Abstract

PURPOSE:To improve a copy speed by executing a slit exposure by moving an optical member in the direction opposite to the conveying direction, while conveying an original at a prescribed speed. CONSTITUTION:While conveying the original 2 which is fed to an original placing table 6 by an original resist roller 23 and an intermediate belt 4 at a prescribed speed V1 by a conveying belt 5, a first optical scanner 7 exposes the original by moving at a prescribed speed V2 in the direction opposite to the conveying direction. In this case, a peripheral velocity of a photosensitive drum 14 is controlled so as to become V1+V2=V in case of unmagnification copying. In such a way, since the original 2 and the first optical scanner 7 move relatively at a speed of V1+V2, a copy speed increases, and also, since the first scanner 7 is not fixed, a lock device therefor becomes unnecessary, and also, since temperature does not rise, a cooling fan, etc., become unnecessary.

Description

[Detailed description of the invention] Technique Forest Disaster The present invention relates to a copying machine equipped with an automatic document feeder.

BACKGROUND OF THE INVENTION Hitherto, a copying machine of this type, such as the one shown in FIG. 5, has been known. In this copier, the ADF (
When using automatic document feed, document 2 placed on document tray 1.
The documents are separated one by one by the document separating section 3, and the leading edge of the document comes into contact with a document registration roller 23 that is driven via an electromagnetic clutch (not shown) or the like. Thereafter, the document registration roller 23 rotates at a predetermined timing, and the document 2 is fed onto the document placement table 6 by the registration roller 23 and the intermediate belt 4, and then moved to a predetermined position on the document placement table 6 by the conveyance bell l-5. sent to and stopped. After exposure, the original 2 is discharged onto the original discharge tray 24 by the conveyor belt 5. On the other hand, while the original 2 is stopped below the original placing table 6, the first
The optical scanner 7 is moved at a predetermined speed V, the second optical scanner 8 is moved at a speed v/2 by a driving member (not shown),
The image of the original 2 is displayed on the first mirror 9, the second mirror 10, and the third mirror.
The light passes through the mirror 11, the lens 12, and the fourth mirror 13, and is exposed to the photosensitive drum 14. Further, the transfer paper 16 on the paper feed tray 15 is conveyed toward the photoreceptor drum 14 by a paper feed roller 17, and transferred to the photoreceptor drum 14 by a transfer charger 18.
After the image on the paper is transferred, the paper is separated by a separation charger 19, fixed by a fixing roller 20, and then discharged onto a paper discharge tray 21. A transfer paper registration roller 22 that is driven via an electromagnetic clutch (not shown) is provided upstream of the transfer section, and the transfer paper 16 is moved along this registration roller 2.
After the leading edge contacts the drum 14 and stops once, the paper is fed at a timing that matches the timing of the leading edge of the image on the drum 14.

However, in the conventional apparatus as described above, when using the ADF, as described above, the slit exposure must be started after the original 2 is completely fed to the original platen 6 and stopped, which reduces the copy speed. In order to solve this problem, when using the ADF, the first optical scanner 7 with the exposure lamp 31 is fixed in the middle of the isa mounting table 6 as shown in FIG. 3. The original 2 fed by the original registration roller 23 and the intermediate belt 4 is transported by the transport belt 5 at a predetermined constant speed V (same as the circumferential speed of the drum 14 when copying at the same size), and the original 2 is moved. There is a type that aims to improve the copying speed by performing exposure using only a sheet-through type.

However, in this case, not only is a device required to lock the first optical scanner 7 midway on the document table 6, but also the exposure lamp 31 is used to expose the first optical scanner 7 while it is fixed. temperature rises,
Therefore, there is a drawback that a cooling fan 30 or the like is required.

The purpose of this invention is to solve the above-mentioned conventional problems and provide a copying machine that can improve copying speed without requiring a locking device or cooling fan for an optical scanner. shall be.

This invention, which achieves the above object, includes a document registration roller that adjusts the timing of feeding the document, a feeding member that feeds the document to the document tray, and a feeding member that feeds the document to the document tray. In the electrostatic copying machine, the electrostatic copying machine is equipped with a transport member that transports the document above, an optical member that moves below the document table and applies slit exposure to the document, and a transfer paper registration roller that adjusts the timing of conveyance of the transfer paper. A position detection member is provided on the movement path of the optical member, and the document registration roller and the transfer paper registration roller are operated based on a signal from the detection member, and while the document is moved at a constant speed by the conveyance member. The present invention is characterized in that a control device is provided for moving the optical member at a constant speed in a direction opposite to the direction in which the optical member is transported.

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 structural members as those of the conventional machine (FIG. 5), and these members are given the same reference numerals.

In this invention, the document 2 fed to the document table 6 by the document registration roller 23 and the intermediate belt 4 is conveyed by the conveyor belt 5 at a constant speed v1, and the first optical scanner 7 is moved in the opposite direction to the conveyance direction. It exposes by moving at a constant speed v2. At this time, the circumferential speed of the photosensitive drum 14 is controlled so that in the case of full-size copying, V + v2 = v. The operations of the conveyor belt 5 and the first optical scanner 7 are controlled by a control device (not shown). As described above, since the original 2 and the first optical scanner 7 move relative to each other at a speed of V□+v2, the copying speed increases, and the first scanner 7 is not fixed. There is no need for a locking device, and there is no temperature rise, so there is no need for a cooling fan or the like.

In the above method, in order to prevent the image obtained on the transfer paper 16 from being misaligned, the operation timing of the original registration roller 23 and the transfer paper registration roller 22 must be adjusted.

For this reason, in the present invention, a home sensor 3 is further provided in the movement path of the first optical scanner 7 near its starting position.
2 is provided, and as shown in FIG. 2, a signal is output when the detection plate 33 of the first optical scanner 7 passes this home sensor 32. As shown in FIG. 4, the output signal of the home sensor 32 is input to the microcomputer unit 36 via the input/output interface 35, and based on this signal, each electromagnetic magnet of the original registration roller 23 and the transfer paper registration roller 22 is The operation of clutches 23' and 22' is controlled.

That is, as shown in FIG. 3, the print button is turned on, the first and second optical scanners 7.8 are driven, and the conveyor belt 5 is driven.
When detecting the first optical scanner 7, the document registration roller 23 is activated after a predetermined detection time Ams has elapsed, and the transfer paper registration roller 22 is activated after a predetermined detection time Bms has elapsed. In this way, the Ha registration roller 23 and the transfer paper registration roller 22 operate at predetermined timings, so that a proper copy without any positional deviation of the image can be obtained.

5. As described above, according to the present invention, while the JJfi document is transported at a constant speed, the optical member is moved in the opposite direction to the transport direction to perform slit exposure, thereby improving the copy speed. Furthermore, there is no need for conventional locking devices or cooling fans for optical members, and the device can be manufactured at low cost. Further, since the original registration roller and the transfer paper registration roller are operated at predetermined timing based on the signal from the position detection member of the optical member, a proper copy without any positional deviation of the image can be obtained.

[Brief explanation of 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 the control device, and FIG. 4 is a block diagram of the control device. 5 and 6 are front views showing the conventional example. 2...Manuscript...Conveyor belt 6...
Original stage 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)

[Claims] 1. A feeding member that includes a document registration roller that adjusts the timing of feeding the document and feeds the document to the document platform; a transport member that conveys the fed document on the document platform; In an electrostatic copying machine equipped with an optical member that moves below a table and performs slit exposure on a document, and a transfer paper registration roller that adjusts the conveyance timing of the transfer paper, the member is positioned along the movement path of the optical member. A detection member is provided, and the original registration roller and the transfer paper registration roller are operated based on a signal from the detection member, and while the original is moved at a constant speed by the transport member, the original is moved in the opposite direction to the transport direction. An electrostatic copying machine characterized by being provided with a control device that moves an optical member at a constant speed.