JPS60208769A - One-surface and both-surface copying machine - Google Patents

Abstract

PURPOSE:To obtain a both-surface copy which provides no distress to confirmation and an economical one-side copy with only a small storage space by providing a paper thickness detecting means to a copying machine with a both-surface copying function, and stopping both-surface copying operation when thin paper is detected. CONSTITUTION:The one-surface and both-surface copying machine has a both- surface copying function and photocoupler units P and P' connecting with a paper thickness signal generating means are so arranged between the register roller 14 and paper feed rollers 13 and 13' as to detect the quantities of transmitted light of sheets 110 and 110' of paper which are conveyed slightly out of paper feed cassettes 10 and 10' and stopped. When detection result data on only the recording paper 110' is inputted as paper thickness information, both-surface copying operation is not performed and when data on only the thick recording paper 110 is inputted, the copying operation is performed in both modes, thereby obtaining the both-surface copy which provides no distress to confirmation and the one-surface copy which is economical with only a small storage space.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to electrostatic copying machines, particularly electrophotographic copying machines (transfer type copying machines that perform Otsu-type development), and in particular to dual-purpose copying machines capable of single-sided and double-sided copying. It flashes.

[Prior art]

Copying using copiers has traditionally been done by single-sided copying due to the complexity of operation, the need to hold pages, and the complexity and size of the device, but this has led to the need to save transfer paper and lack storage space. Alternatively, double-sided copying is desired due to the appearance and weight of the copy booklet, and many proposals have already been made for double-sided copying. For example, special IJIJ 1977-1
No. 37341, 9.1 Kaimei No. 54-43742, etc., and proposals such as Japanese Patent Application No. 58-85103 are referred to regarding double-sided copying.

Each of the above-mentioned proposals concerns the performance of double-sided copying, and does not take into account the suitability of the recorded image as a recording medium. It is preferable to use transfer paper that is as thin as possible, such as paper with a basis weight of 6.
5 B/v2 paper is used as standard. However, when making double-sided copies, the image on the back side of the paper is transparent, making it extremely difficult to see the image on the front side, and it also looks bad as a booklet. Furthermore, double-sided copying inevitably requires passing the paper twice, and weak N paper tends to wrinkle easily. Also, re-extracting the manuscript, etc.
The post-processing of complex:q failure is surprisingly complicated in E1.

[Purpose of the invention]

The present invention provides a copying machine capable of both single-sided and double-sided copying, which allows double-sided copying to be performed without difficulty in recognition based on imprinting of images on the back side, and without causing accidents such as jamming when performing double-sided copying. The purpose is to provide double-sided copying.

[Structure of the invention]

The present invention is provided with a detection means for detecting paper thickness, and during lunar surface/double-sided copying, the control section is controlled based on the 1i'1 report from the filter paper thickness detection means and the signal from the copy designation section. This system is configured to stop double-sided copying when only thin recording paper is being fed due to output. This is achieved by a single-sided/double-sided copying machine which is equipped with a single-sided/double-sided copying machine and is characterized in that double-sided copying is stopped when thin paper is detected.

〔Example〕

An embodiment of the single-sided/double-sided copying (reed) according to the present invention is shown in Figures 1 to 4.

Based on the drawings below, the fi! Explain the 4M and its effects.

Figure f:tS1 shows a schematic configuration of an embodiment of single-sided/double-sided duplication according to the present invention. A scanning optical system 2 is provided on the platen glass P. The scanning optical system 2 includes a reciprocating document illumination lamp 2a, mirrors 2J and 2c, and a fixed lens 2d and mirror 2c. A photoreceptor drum 3 is provided in the center of the interior of the main body so as to be rotatable in the direction of arrow J, and around it are a charging electrode 4 for uniformly charging the photoreceptor 3a along the rotational direction, and a developing sleeve. A developing device 5 having a built-in developing device 5a, a transfer electrode 6, a separation electrode 7, a static elimination electrode 8, and a cleaning device 9 are arranged in this order. 10. There are two types of recording paper of different sizes in the paper feed tray (paper storage unit) 10.10' and 2 types of recording paper of different sizes. is stored and set in the main body 1. Paper feed case lio, 1
The recording paper is inserted into the inside of 0' by pressure row 211.
\A bottom plate 12 for lifting is provided. 13 and 1
:(' is a paper feed roller that feeds and detours the recording paper stored in the paper feed cassettes 10 and 10' to the position of the registration roller 14, which will be described later. This is to prevent the recording paper from being fed overlapped. It is composed of rollers 13a, 13a and a stop roller 18b, which are rotated through belts respectively.14 is the paper feed roller 13 or 1.
A registration roller that temporarily stops the recording paper fed by 3' and then feeds the paper again toward the transfer position in synchronization with the leading edge of the image on the photoreceptor 3a. rJ, seven automatic coupler units P and P' connected to the paper thickness 4fj generating means are installed between the registration roller 14 and the paper feed rollers 13 and 13', respectively. The recording paper 110 and 110' are placed in a state where the amount of transmitted light is detected after they have been slightly removed from the paper cassettes 10 and 10' and have stopped. 15 is a conveyor that transports the recording paper after being rotated to the fixing position. The fixing device 16 is a heating roller 16.
a and a pressure roller 16b. Reference numeral 17 denotes a paper discharge roller that discharges the recording paper after fixing to a recording paper reverse feed device n18. It is provided on the side and consists of a forward rotation roller 18u and a forward and reverse rotation roller 18b. 19
20 is a sorter provided on the A-1 paper side of the recording paper reverse feeding device 18 for aligning the sheets of recorded material; 20 is a single-sided recorded paper fed from the recording paper reverse feeding device 18 provided in the stand 21; This double-sided tray 20 is a double-sided tray that temporarily stores recording paper.The front of the feeding direction (right side in the figure) of this double-sided tray 20 is oriented slightly downward in order to easily store the recording paper, and the recording paper is placed on the front side of the device. The device is tilted so that the front side of the device is lowered so that it can be aligned.

The screen tray 20 is also provided with a side regulating plate (not shown) that is movable in accordance with the width of the recording paper and a double-sided tray auxiliary guide plate 231 (described later).

Reference numeral 22 indicates an auxiliary conveyance bell (23°2) for guiding the recording paper back to the duplex tray 20 during double-sided copying.
3' and 23'' are connected to arrow J by the parallel four-bar link 24.
These pressure rollers 23, 23' and 23'' have parallel four-bar links with double-sided tray auxiliary guide plates 231 that hold the recording paper on the auxiliary conveyance belt 22 side, respectively. t=
It is worn. Also, the pressure roller that smells like this 2. I.

23', 23'' is a double-sided tray auxiliary light plate 231
It moves integrally with the recording paper and comes into pressure contact with the auxiliary conveyance belt 22 according to the size of the recording paper during double-sided copying. When the recording paper size is large (for example, B3 size), only the left roller 223 moves to the position shown by the chain line, and when the recording paper size is medium (for example, B4 size), the left roller and the medium-heat roller 23 move. .2
3' moves to the position shown by the chain line, and when the recording paper size is small (for example, 84.115 size), all three rollers 23, 23', and 23'' move to the position shown by the chain line. Yes.25(j: 1i1i 1!
This is a re-feed roller for feeding out the recording paper 111 after single-sided copying in A 20, and this ifr paper feed port 25 is also used in the same way as the paper feed rollers 13 and 13' to prevent double feeding. is planned. As shown in the figure, the double-sided tray 20, the auxiliary conveyance belt 22, and the pressure roller? 2:11
23'+23'', link 24, and paper refeed roller 2
5 is provided in a recording paper holding section 26 that can be moved up and down within the pedestal 21. An intermediate roller 27 is provided between the rows 214 and 25 in order to convey the recording paper fed by the paper refeed roller 25 to the position of the lens roller 14.

Next, the operation of the single-sided/double-sided copying machine will be explained.

First, when copying is to be performed on only one side of the recording paper, set the copy designation section to single-sided copy mode and press the copy button once. A static latent image of the document M is formed on the photoreceptor 3a. The static image is made into a visible image by the developing device 5, and the visible image is transferred by the transfer electrode 6 onto the thin recording paper from the paper feeding power center 10' of the main body 1. After the transfer, the recording paper is separated from the photoreceptor 3a by the separation electrode 7, and transferred to the fixing device ri! by the conveying device 15. It is transported to iIO and then
The recording paper reverse feeding device 18 is carried out by the palm paper roller 17.
sent to.

At this time, each roller 18a, 18b of the recording paper reverse feed device 18
Since each of the two rotates in the normal direction (the recording paper is directed toward the sorter 19 in a circular direction), the recording paper is sorted into the sorter 19 with its copy side oriented in the opposite direction.

On the other hand, when copying 7f on both sides of recording paper, set the copy designation section to duplex copy mode and turn on the copy button. is transferred by the transfer electrode 6. After the transfer, the recording paper is separated from the photoreceptor 3a by the separation electrode 7, conveyed to the fixing device 1616 by the conveyance device 15, fixed there, and sent to the waste paper roller]7 and sent to the recording paper reverse feed device 18. . At this time, the roller 18b of the recording paper reverse feeding device 18 rotates in reverse (rotation in the opposite direction to normal rotation), and the auxiliary conveyance belt 22 starts to drive, pressing rollers 23, 23' corresponding to the recording paper size.

23'' moves to the position shown by the chain line, the side regulating plate moves, and the recording paper that has undergone the above-described series of copying processes and has been copied on one side is moved toward the roller 18b by the roller 18a of the recording paper reverse feed device 18. transported.

Since the conveyance force of the roller 218a is greater than that of the roller 2181, the recording paper is conveyed with its leading edge sliding on the rollers 181+J-. The roller 1811 is not in strong pressure contact with the recording paper, the conveying force is weak, and the roller 18
A jam will not occur due to the conveying force of a.

After that, when the trailing edge of the recording paper is scraped from the roller 18a, the conveying force toward the roller 181+ side (toward the paper) is lost, and conversely, the conveying force in the opposite direction by the roller 18b works, albeit weakly, and the recording paper continues until that point. A pressure contact roller 223.23 that is reversely fed with its rear end as the leading edge and moves up and down according to the auxiliary conveyance belt 22 and the recording paper size and is driven by the auxiliary conveyance belt 22.
', 23'' and guided to the double-sided tray 20 with the double-sided q side facing upwards. Through the same process, the legal number of recording sheets are stacked one after another in the double-sided tray 20. Recording. When a predetermined number of sheets of paper are stacked in the double-sided tray 20 (I'1LJri number is based on the set number of sheets), the driving of the auxiliary conveyance bell 1.22 is stopped, and the front of the double-sided tray 20 (l'll, il+'
The j' state (not shown) is released and they become parallel. At the same time, a double-sided copy signal is output and the copying operation for side a is started. That is, the uppermost recording paper in the double-sided Louis 20 is lifted upward via the middle plate 102 by the rotation of the bottom plate 01 and is pressed against the paper refeed roller 2S. Thereafter, the paper refeed port 25 starts rotating, and the uppermost recording paper in the double-sided tray 20 is fed toward the main body 1 by the paper refeed roller 25. This is double-sided tray 2
1 in front of 0 (the slope is already kept parallel, so
Paper feeding by the roller 25 is easy. The recording paper fed by the paper re-feeding roller 25 passes through the intermediate roller 27 and is sent to the position of the registration roller 14, and the subsequent recording paper follows the same path as when copying one side previously. undergoes copy processing. The recording paper on which double-sided copying has been completed in this way is transferred to the paper ejection roller 17 and the roller 18a of the recording paper reverse feeding device 18.
and the row 2181 which is already rotating in the normal direction, the copies are initially output with the copy side of the later copy facing upward and are sorted into the sorter 19 if a sorter is installed.

As mentioned above, the single-sided/double-sided board of the present invention 'T 4fit
2, even if either one-sided or double-sided copy mode is selected in the copy designation area, by operating the copy button it is possible to select paper suitable for the copy mode, that is, supply recording paper of the appropriate thickness. The control and operation of these functions is performed as follows.

That is, as shown in FIG.
13 from the single-sided or double-sided copy designation section, the so-called copy mode designation section, and the information regarding the transparency of the recording paper from the photocoupler units P and P' shown in FIG. 2, that is, the paper thickness information. is input, and the existence and arrangement of thick or thin recording paper are identified by the memory that stores the specific amount of transmitted light.

If only thin recording paper 110' is input as a detection result in the paper thickness information in the 3rd UA to the overlay control unit (CP TJ), even if you operate the copy button as shown in the vS4 figure, the When the double-sided copy mode signal is input, double-sided copying is not activated, and by switching to the single-sided copy mode, single-sided copying is performed using thin recording paper 110'.

On the other hand, if only the cardboard recording paper 110 is detected manually, copying can be performed in either double-sided or single-sided copy mode, as shown in FIG.

In addition, instead of detecting the paper thickness of the recording paper using the photocoupler units P and P', the paper feed cassettes 10 and 10' that store the recording paper 110 and 110', respectively, are provided with their own dedicated detection parts, and a plurality of It is also possible to indirectly detect the thickness and location of the recording paper using a microswitch, etc. 6 [Effects of the Invention] When copying, the present invention allows only one-sided copying to be made on thin recording paper, and only one-sided copying on thick paper. For paper, we will provide single-sided and double-sided copies that can make single-sided or double-sided copies, making it possible to obtain double-sided copies that are easy to certify and single-sided copies that are economical and require little storage space. It became a thing.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the present invention up to single-sided and double-sided copying. Figure 2 shows the main parts. FIG. 3 is a control circuit diagram of the above-mentioned copy). The tiS4 diagram is 70-Char-1. 10.10'...Paper cassette 110...(thick paper) Recording paper 110'...(thin paper)
Recording paper 13.13'...Paper feed rollers P, P'...7 Otokufu unit 14...Registration roller 18...Recording paper reverse feeding device 19...Sorter 20...Double-sided tray 25...Refeed roller 27...Intermediate roller agent Patent attorney Noguchi 1 Parent-in-law

Claims (1)

[Claims] A copying machine with double-sided copying function, equipped with paper thickness detection means,
A single-sided/double-sided copying machine characterized by stopping double-sided copying when thin paper is detected.