JPS60220366A - Automatic double face copying machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention has an intermediate tray for storing transfer paper on which one side has been transferred, and an image is recorded on the back side of the transfer paper sent from the intermediate tray. This invention relates to an automatic double-sided copying machine that records images on both sides of transfer paper.

[Prior art]

Generally, in an automatic duplex copying machine, when two sheets of transfer paper are fed from the document tray to the transfer unit, images are recorded on them, and then stored in the intermediate tray, blank transfer paper is mixed into the intermediate tray. Therefore, if the transfer sheets in the intermediate tray are sent out one by one and an image is recorded on the back side of each transfer sheet, there will be a sheet of transfer paper on which an image is recorded only on the back side.

In view of this point, an automatic double-sided copying machine is already known which is provided with a detection means for detecting double feeding of transfer paper. Such an automatic double-sided copying machine is described in Japanese Patent Application Laid-Open No. 57-197560, and in the automatic double-sided copying machine of this publication, the detection means is provided in the transfer paper path near the transfer section,
When this detection means detects double feeding of transfer sheets, the guide is switched so that the double fed transfer sheets are discharged onto the paper discharge tray without being introduced into the intermediate tray.

However, in such conventional automatic duplex copying machines, not only the blank transfer paper but also the single-sided transferred transfer paper that is fed overlapping with the blank transfer paper is ejected to the paper ejection tray. Therefore, there is a disadvantage that the number of copies per copy is insufficient, and a correction means is required to correct this shortage.

〔the purpose〕

The present invention eliminates the drawbacks of the conventional ones mentioned above,
An object of the present invention is to provide an automatic double-sided copying machine that removes only blank transfer paper from multi-fed transfer paper.

Structure The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows the entire automatic double-sided copying machine according to the present invention, but the document feeding device on the contact glass 1 is not shown. An optical system 3 is disposed below the contact glass 1 stretched over the upper wall 2a of the casing 2, and transmits light that scans an original (not shown) on the contact glass 1 to the transfer unit 4. It looks like this. The transfer section 4 is configured with a charging device, a developing device, a transfer device, etc. arranged around the photosensitive drum 5, but since the structure is similar to a known structure, detailed description thereof will be omitted.

A transfer paper cassette 6.6 is mounted on the end wall 2b of the casing 2.
The valley transfer paper cassette 6.
A transfer paper path 7 and various rollers 8 for feeding transfer paper (not shown) in 6 one by one to the transfer section 4.
, 8... are arranged inside the casing 2. On the downstream side of the transfer section 4, there is a conveyance mechanism 9 for conveying the transfer paper.
is provided, and the transport mechanism 9 can swing around its left end portion as a fulcrum. On the other hand, an operating lever 10 that rotates to swing the transport mechanism 9 is disposed below the transport mechanism 9. By rotating the operating lever 100, the transport mechanism 9 is moved to the transport position shown by the solid line. and a retracted position shown by a chain line. The transport mechanism 9 is able to take the retracted position because
This is to make it easier to remove jammed transfer paper.

On the downstream side of the conveyance mechanism 9, a pair of fixing rows 211,
A fixing section 12 having a fixing section 11 is provided to fix the toner adhering to the transfer paper.

A transfer paper path 13 is formed on the downstream side of the fixing unit 12 and is inclined toward the lower left. A pair of conveying rollers 14 is provided at the lower end of the transfer paper path 13.

15 are arranged opposite to each other, one of these conveyance rollers 15
has a large diameter and is also connected to a vacuum roller 16, which will be described later.

A switching pawl member 17 is provided on the downstream extension of the transfer paper path 13.
is arranged so that it can take the solid line position and the chain line position in FIG. Further, when the transfer paper is at the chain line position, the transfer paper from the transfer paper path 13 is discharged to a paper discharge tray (not shown) by the paper discharge row 219°19.

As shown in detail in FIG. 2, the reversing section 18 has a guide P2o that curves upward, and the length of this guide 2 (J is longer than the maximum length of the transfer paper). Further, an inner guide 21 facing the guide 2 is provided at the upper part of the guide member to prevent the upper end of the transfer paper from bending.The left side of the switching claw member 17 A reversible drive roller 22 is disposed in the
The transfer paper can be conveyed in either the left or right direction. A driven roller bar is disposed above the driving roller 22, which swings about a fulcrum and can move toward and away from the driving row 222, and this driven roller 224 can rotate only in a clockwise direction. It has become. Also, this tlJ
A reversible driven roller 5 is arranged near the J-roll ram.

The reversing section 18 is provided with a detection means 4 that detects the thickness of the transfer paper located in the reversing section 18 and detects double feeding of the transfer paper. This detection means 26 includes a light emitting section that emits light in a direction perpendicular to the guide force, and a light emitting section 2 that emits light in a direction perpendicular to the guide force.
It has a light-receiving section path that receives the light from the light-emitting section through a guiding opening (not shown), and the light from the light-emitting section passes through the transfer paper midway through the transfer paper due to the difference in transmittance. 1
transmission is detected.

A vacuum roller 16 that rotates clockwise is disposed on the right side of the switching claw member 17, and this vacuum roller 16 is connected to a vacuum pump (not shown) so that the transfer paper can be attracted to the peripheral surface of the vacuum roller 16. ing. The conveying roller 15 located above the row 216 is in contact with the circumferential surface of the vacuum roller 16, and the vacuum roller 16
It is designed to follow the rotation of the The vacuum roller 16 is controlled by a control means (not shown) so that it is evacuated for a predetermined time when the detection means section detects double feeding of transfer sheets.
A tray 4 for receiving the blank transfer paper sucked by the vacuum roller 216 is arranged substantially below the vacuum roller 6, and one side wall 29m of the tray 4 serves as a guide for the vacuum roller 1.
It extends to the sides of 6. Moreover, a separating claw member is in pressure contact with the lower surface of the vacuum roller 16, and the transfer paper adsorbed by the vacuum row 216 is peeled off.

On the right side of the conveyance row 215, there is a pair of pulleys 3].

A conveyor belt 33 is wound around the pulley 32 and runs horizontally, and a conveyor roller is in pressure contact with the lower part of the one pulley 31. In addition, this conveyance row 234
On the right side of , there are three claw members 35', 35, 3., each of which is rotationally controlled individually. ') are arranged in series, and depending on the size of the transfer paper, one of the claw members 35 can take the open position and introduce the transfer paper for single-sided transfer into the lower intermediate tray 36. There is.

The intermediate tray 36 is disposed in the lower part of the casing 2, and has a dispensing mechanism which is biased by a spring (not shown) above the distal end and is given a counterclockwise rotational habit. Old -237 is installed.

Further, in the vicinity of this delivery roller 37, respective ridge rollers 8, 8, . ing. Furthermore, a releasable stone e39 is provided at the front end of the intermediate tray 36.

Note that reference numeral 40 in FIG. 1 is a motor for driving various members.

Next, the operation of the embodiment described above will be explained.

When making a one-sided copy, place the original on the contact glass 1 and press the copy 2 button (not shown).The optical system 3 scans the original and the light is used to copy the original onto the photosensitive drum 5 of the transfer unit 4.
An electrostatic latent image is formed on the toner, and this electrostatic latent image is visualized by toner. On the other hand, transfer paper of a size preselected in advance to match the rotation of the photosensitive drum 5 is supplied to the transfer paper path 7 one by one from the transfer paper cassette 6 or 6, and as it passes through the transfer section 4, The image on the photosensitive drum 5 is transferred onto one side of the transfer paper.

By the way, in the case of single-sided copying, the switching claw member 17 located near the reversing unit 18 is in the position shown by the chain line in FIG. After passing through and fixing the image, transfer paper path 1
3, passes between the switching pawl member 17 and the drive row 222, and is discharged to a paper discharge tray (not shown) by paper discharge rollers 19, 19.

On the other hand, when making a double-sided copy, when the double-sided copy button 2 is pressed, the switching claw member 17 takes the position shown by the solid line in FIG. The claw member 35 is in the open position. Therefore, when you place the original on the contact glass 1 and press the copy 2 button (not shown), the image is printed on one side of the transfer paper fed out one by one from the transfer paper cassette 6 in the same way as in the case of single-sided copying described above. is transferred and fixed. Then, this transfer paper is introduced into the transfer paper path 13 or the reversing section 18,
When the rear end of the transfer paper passes between the rollers 4 and 24, the roller 22 is separated from the roller 22, and the drive roller n is reversed so that the transfer paper is conveyed to the right with the rear end leading. Thereafter, it passes between the vacuum roller 16 and the conveyance roller 15 and is introduced into the intermediate tray 36 . In this intermediate tray 36, an image is transferred onto the upper surface of the transfer paper.

By the way, the reversing section 18 is provided with a detection means for detecting double feeding of the transferred paper, and when this detecting means detects one feeding of the transfer paper in the reversing section 18, this double feeding transfer is detected. Immediately before the paper reaches the vacuum roller 16, vacuuming of the vacuum roller 16 starts, and the lower blank transfer paper among the double-fed transfer papers is sucked. At this time, 1. The upper one-sided transfer paper is separated from the blank transfer paper,
It is introduced into the intermediate tray 36 and stored therein. On the other hand, the blank transfer paper attracted to the vacuum roller 16 is sequentially moved to the vacuum roller 1 from the tip side by a separating claw member (G).
6 and stored in the lower tray 29.

Note that the vacuuming of the vacuum roller 16 is stopped before and after the blank transfer paper is completely peeled off by the vacuum roller 16.

As described above, the blank transfer sheets of the multi-fed transfer sheets are removed, so that all the transfer sheets that have been transferred on one side are stacked and stored in the intermediate tray 36 without any omission. When all images have been transferred to one side of the transfer paper, the user changes the original on the contact glass 1 and presses the button again.

Then, the switching claw member 17 switches to the chain line position.
Then, the stopper 39 of the intermediate tray is retracted, and the transfer paper that has been transferred on one side is sent out one by one from the intermediate tray, reaches the transfer section 5 from the transfer paper path 7, and the image of the original is transferred to the back side. Ru. In this way, the transfer paper with the image of the original transferred on both sides passes from the transfer paper path 13 between the switching pawl member 17 and the drive roller n, and then passes through the paper ejection rollers 19, 19.
The paper is ejected to a paper ejection tray (not shown) via the paper.

According to this embodiment, when the detection means 26 provided in the reversing section 18 detects double feeding of transfer paper, the vacuum roller is evacuated and only the blank transfer paper is removed from the normal path. Therefore, double-sided copies can be made without running out of copies.

In this embodiment, the detection means is provided in the reversing section 18, but the position where the detecting means 26 is provided is in the reversing section 18.
However, the transfer paper path is not limited to the intermediate tray 36, and may be provided at other locations as long as the transfer paper path reaches the intermediate tray 36. Further, the means for detecting double-fed transfer paper is not limited to only light (direct thickness detection may be used), and the separating means is not limited to the vacuum roller 16.

[Effects] As explained above, the automatic double-sided copying machine according to the present invention has the following effects:
A detection means for detecting double feeding of transfer paper is provided in the transfer paper path leading to the intermediate tray, and a separation means for separating blank transfer paper is provided in the transfer paper path downstream of this detection means, and the detection means When the means detects the double feeding of transfer paper, the separation means is activated to remove the blank transfer paper from the transfer paper path, so that the blank transfer paper and the single-sided transferred transfer paper overlapped with each other are separated. is introduced into the intermediate tray without being removed, resulting in the excellent effect that double-sided copies can be made without causing a shortage in the number of copies.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of an automatic double-sided copying machine according to the present invention, and FIG. 2 is an enlarged view of the main parts of FIG. 1... Contact glass, 2... Casing, 3...
...optical system, 4...transfer section, 5...photosensitive drum,
6... Transfer paper cassette, 16... Vacuum roller, 17... Switching claw member, 18... Reversing section, ah...
Detection means, n... Light emitting section, A... Light receiving section, 29...
- Tray, 36... Intermediate tray, 39... Stopper. Applicant's agent Kiyoshi Inomata

Claims (1)

[Claims] In an automatic double-sided copying machine having an intermediate tray for storing transfer paper that has been transferred on one side, a detection means for detecting double feeding of transfer paper is provided in the transfer paper path leading to the intermediate tray, and a detection means downstream of this detection means is provided. Separating means for separating blank transfer paper is provided in the transfer paper path, and when the detection means detects double feeding of transfer paper, the separation means operates to remove the blank transfer paper from the transfer paper path. An automatic double-sided copying machine characterized by: