JPH0248469B2 - KIROKUSOCHINOYOSHISHUSEKISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper stacking device in a double-sided recording device of an electrophotographic copying machine that is capable of copying on both sides of recording paper.

Conventional technology Recording devices that can copy both the front and back sides of a manuscript or two pages of a document onto a single sheet of recording paper are becoming increasingly popular due to the recent increase in the amount of office work and demands for resource and labor savings. The need for this has increased, and the development of functions that can meet various demands is progressing.

Regarding this double-sided recording device, JP-A-52-
Proposals have been made in Japanese Patent Publication No. 137341, Japanese Patent Publication No. 54-43742, and Japanese Patent Publication No. 56-41107, etc., but all of them have complicated structures and are prone to failure during the paper conveyance process, etc., and the devices are also large. It has the disadvantage of

In addition, the positions of the originals copied on the front and back sides of the recording paper are often uneven, causing problems when binding.
Many practical problems have been recognized.

OBJECTS OF THE INVENTION The present invention provides a paper accumulating device in a double-sided recording device that prevents accidents during conveyance of recording paper with an extremely simple configuration and makes it possible to copy accurately at a predetermined position on the back side of the recording paper. It is intended for the purpose of providing.

Structure of the Invention The present invention provides a stacking device for temporarily stacking recording paper, the front side of which has been transferred and fixed, before reversing the recording paper and re-recording on the back side, in order to achieve the above object. A toner image formed on a photoreceptor drum by an image forming means provided in the main body of the copying machine is transferred onto recording paper by a transfer pole, and after the toner image on the recording paper is fixed in a fixing section, the recording paper is sequentially a tray for accumulating recording paper; a paper feeding section for refeeding paper from the tray in order to form a toner image on the other side of the recording paper by the image forming means; an intermediate plate that descends from the paper feeding position of the tray and aligns and stacks the leading edge of the recording paper against the abutment plate; The present invention provides a paper stacking device for a recording apparatus, characterized in that a cam is provided for causing the recording paper to abut against a guide support plate while being inclined laterally with respect to the direction of the recording paper. That is, the present invention makes it possible to tilt a recording paper receiving member having a fixed inclination angle with respect to the paper feeding direction in a direction perpendicular to the paper feeding direction by bringing it into contact with a rotatable cam member using, for example, elastic means. The device is configured to perform the above operations.

Embodiment FIG. 1 is a configuration diagram showing a recording paper conveyance path in a copying machine equipped with a double-sided recording device to which the present invention is applied. FIGS. 2a and 2b are detailed views of the recording paper stacking device according to the present invention, and FIGS. 3 and 4 are views of the main parts thereof.

In FIG. 1, an original 2 placed on a platen glass of a copying machine main body 1 is image-exposed onto a photoreceptor drum 4 by moving optical systems 3 and 3a. At the periphery of the photosensitive drum 4, various processing devices such as a charging and developing device are arranged as known image forming means.

The uppermost recording paper is fed one by one from the recording paper cassette 5 by a paper feeding section 6 consisting of a paper feeding roller, a separation belt, and a sorting roller, and after being temporarily stopped by a registration roller 6a, it is transferred to the photosensitive film. After matching the timing with the leading edge of the image on the body drum 4, feeding is performed again.

The toner image on the photoreceptor drum 4 is transferred to the fed recording paper at the transfer pole 7, and the toner image is transferred to the fixing section 8.
After completing the copying process, the paper is discharged to the outside of the machine by a paper discharge roller 9.

Reference numerals 12 and 13 are paper transport rollers that constitute a part of the double-sided recording device 11 in the main body 1 of the copying machine, but in the case of normal copying of only one side of the recording paper, the paper transport rollers 12 and 13 are Since both rotate in the forward feed direction, the recording paper discharged outside the machine can be conveyed to, for example, a known sorter 10.

On the other hand, when performing double-sided copying, when the operation of the main body 1 of the copying machine is switched to the double-sided copy mode, the paper conveyance roller 13 is reversed, but its conveyance force is less than the conveyance force of the paper conveyance roller 12. Since it is weak, the recording paper slips on the surface of the paper transport roller 13 and is fed sequentially. However, when the trailing edge of the recording paper leaves the paper transport roller 12, the recording paper P completely loses its transport force in the paper ejection direction, and at the same time, the paper P is transported by the paper transport roller 13 in the opposite direction to normal paper ejection. Receive power. Therefore, the trailing edge of the recording paper is guided downward by the rotating paper conveyance roller 12 and the guide plate, so that it is conveyed downward by the backup roller 14, with its transfer surface facing upward. Then, the sheets are accommodated in a tray 15, which is a paper stacking section for double-sided copying, which is the main part of the paper stacking device of the present invention, and are sequentially stacked.

The details of the configuration of the tray 15, which is the paper stacking section, will be explained in detail with reference to FIG.

The recording paper P conveyed downward by the back-up roller 14 passes through a pair of pressing and feeding rollers 21 provided on the tray 15, and then passes through the guide plate 2.
6, and is conveyed to the right while being held by a conveyor belt 23 hooked around the drive shaft 22 and driven shafts 22a and 22b, and a pressure roller 25 that is pressed against the conveyor belt 23 by an elastic means (not shown). Ru. The guide plate 26 and the pressure roller 25 are respectively attached or rotatably supported on the upper part of the parallel four-bar link 24 which can be raised and lowered using fixed points 24c and 24d as fulcrums. When the recording paper P is short, the parallel four-bar links 24a and 24b, which are constructed in the same manner as the parallel four-bar link 24, also stand up, and the pressure roller 25 is pressed by their respective elastic means (not shown).
a, 25b are brought into pressure contact with each other via the conveyor belt 23 at the positions of the driven shafts 22a, 22b, and a guide plate 26 provided on the parallel four-bar links 24a and 24b.
The recording paper P can be conveyed to near the right end of the tray 15 by a and 26b. Furthermore, since the recording paper receiving member 27 according to the present invention is inclined by approximately 10 degrees with respect to the conveyance direction of the recording paper P, the recording paper P that has come out of contact between the conveyance belt 23 and the pressure roller 25 is A front abutting plate 28 that slides on the receiving member 27 of the recording paper P and further moves in the conveying direction, and is fixedly provided near the end of the receiving member 27.
is stopped by The recording paper P that is subsequently conveyed similarly comes into contact with the front abutment plate 28 and stops, so that each end surface of the recording paper P is aligned and aligned as shown in the figure and is stacked. Become.

Furthermore, the alignment of the recording sheets P is performed more reliably by the blower 29 installed to blow air in the conveyance direction of the recording sheets P.

Further, the receiving member 27 for the recording paper P according to the present invention is configured such that when the recording paper P is stacked, the end surface 2 of the receiving member 27 is
7c follows the cam 30a fixed to the shaft 30 by the tension spring 27b, and is inclined about 5 degrees to the right as shown in FIG. The recording paper P whose leading edge is aligned with 28 further has its side surface aligned with the receiving member 2.
The recording paper P is aligned with the guide portion 31c of the right guide support plate 31 disposed on the paper 7, and as a result, the two perpendicular sides of the recording paper P are properly aligned at the predetermined position, and therefore, for back side copying. As a result, it is possible to make the original surface accurately correspond to the surface that has already been copied.

On the other hand, in this embodiment, since conveyance and image formation are performed with the center of the recording paper P as a reference, the receiving member 2
The right side guide part 31c and the left side guide part 32c arranged on the guide plates 31 and 32 are connected to the pins 31b on the rack plates 31a and 32a attached to the guide plates 31 and 32, respectively, as shown in the plan view of FIG. ,32
b is a long hole 27d provided in the receiving member 27, respectively.
Since it is fitted into the recording paper, it is constructed so that it can be moved symmetrically and parallel to the center line C of the recording paper. Therefore, the rack plate 31a,
32a are moved by a predetermined amount, and the respective guide portions 31a, 3 of the guide support plates 31, 32 are moved in accordance with the size of the recording paper P.
An interval of 2c can be set. in this case,
The right guide support plate 31 serves as a reference for alignment as described above, so it is correctly placed at a distance of 1/2 of the specified size of the recording paper P with respect to the center line C, while the left guide support plate 32 serves as a reference for recording paper P. In consideration of the variation in the dimensions of the paper P, it is assumed that the paper P is placed at a position slightly outward and away from it.

Further, the guide portion 32 of the left guide support plate 32
c is provided with sloped portions 32d and 32e on the side and top surfaces, respectively, in order to easily receive the recording paper P carried in. Furthermore, the guide portion 32c
Alternatively, a plurality of elastic members (not shown) may be interposed to press the stacked recording sheets against the right guide support plate 31 to further promote alignment. However, the pressing force exerted by the elastic member is set to a level that does not impede the conveyance of the recording paper P.

When the recording sheets P are aligned with the receiving member 27 and stacking is completed, the shaft 30 rotates 180 degrees clockwise in response to a feed start signal and stops, resulting in the state shown in FIG. 2b. That is, the receiving member 27, which was tilted approximately 5 degrees to the right with the shaft 27a as a fulcrum in FIG. A 1/2 turn in the direction moves from the tilted position shown by the solid line to the horizontal position shown by the dashed line. With a slight delay in this movement, the notch 33, which is also integral with the shaft 30, rotates clockwise by 1/2, thereby causing the bell crank 35, whose rotation in the clockwise direction is restricted by the notch plate 33.
However, when the end portion 35a of the notch 33 is released by the notch 33a, the tension spring 35 is released.
It rotates clockwise around the shaft 34 under the action of b. Therefore, the shaft 3 common to the bell crank 35
A pressure roller 36a provided on an integral pressure bonding plate 36 on an extension of 4 pushes up the intermediate plate 37, one end of which is supported by the receiving member 27, in a counterclockwise direction.
7 is pressed against the paper feed roller 38. As shown in FIG. 4, the intermediate plate 37 is dimensioned so that it will not be interfered with by the guide plates 31, 32 even when the guide plates 31, 32 are closest to the center line C of the recording paper P. It is assumed that

In this way, the recording paper P on the receiving member 27 is ready to be fed again for backside copying.
Note that if the rotating shaft of the eccentric cam 30a is provided separately from the shaft 30 and is connected to rotate at an increased speed from the shaft 30, the recording paper P is tilted before being pressed by the paper feed roller 38. The operation from this state to the horizontal state is repeated repeatedly, and the above-described alignment of the recording paper P to the predetermined position is performed more reliably.

Then, the intermediate plate 3 is pressed by the paper feed roller 38.
The recording paper P on 7 is attached to the shaft 38a in the paper feed section 16.
Feeding is started by the counterclockwise rotation of the integrated paper feed roller 38, but the feed roller 38 and the shaft 38a are connected to the integrated belt drive roller 39 and a driven roller 40 provided independently. The uppermost recording paper is separated by the counterclockwise rotation of the paper feed belt 41 and the double-feed prevention member, ie, the sorting roller 42, which contacts the paper feed belt 41 and is driven and rotated in the counterclockwise direction. Only one sheet continues to be fed.

Further, it is desirable that the front abutting plate 28 described above is higher than the stacking height of the recording paper P, but if it is set to match the stacking surface due to restrictions from the configuration of the paper feed section 16, In order to prevent alignment from being impaired due to curling or lifting of the paper P, a holding member 43 for preventing lifting is provided at the center of the recording paper P near the abutting plate 28. The pressing member 43 is made of an elastic member or the like so that it can press the upper surface of the recording paper P appropriately and strongly enough when the stack of recording paper P becomes high.

Furthermore, since the belt driving roller 39, driven roller 40, and sorting roller 42 are arranged on a single substrate, high precision is maintained and a stable sorting function can be obtained.

The recording paper P, which has thus passed through the paper feed section 16, reaches the intermediate conveyance roller 17 along the guide plate 44.

In FIG. 1, the recording paper P that has reached the intermediate conveyance roller 17 enters the paper feed section of the copying machine main body 1, and is temporarily stopped by the registration roller 6a, as in the case of the first transfer described above, and then After matching the timing with the leading edge of the image on the photosensitive drum 4, feeding is performed again and a new image is transferred. In this case, since the recording paper P enters the transfer pole 7 of the photosensitive drum 4 after being reversed, images can be recorded on both the front and back sides of the recording paper P.

Further, the intermediate conveyance roller 17 carries the optional recording paper cassette 5b,
Since it also serves to receive the recording paper P from 5c, it is configured so that it can handle recording paper conveyance from both sides.

Furthermore, since the recording paper is strongly sandwiched between the belt 41 and the separating roller 42, the leading edge of the recording paper P passes through the intermediate conveyance roller 17, reaches the registration roller 6a, stops temporarily, and then starts feeding again. In this case, if the trailing edge of the recording paper P is caught between the belt 41 and the sorting roller 42, it is expected that the recording paper P cannot be conveyed. Therefore, it is desirable that the distance between the sorting roller 42 and the registration roller 6a be slightly longer than the maximum recording paper P.

Effects of the Invention According to the present invention, when reversing the recording paper that has been copied on the front side and transferring the recording again to the back side,
Since high-precision vertical and horizontal position alignment is automatically performed reliably and accurately within the recording device, it is possible to record the document surface correctly at the specified position on the recording paper on both the front and back sides, improving office efficiency and saving resources. A paper stacking device for a recording device that is extremely useful in the field of technology has now been provided.

Although this embodiment has been described with reference to the center of the recording paper for conveyance and image formation, the present invention is not limited to this, and the present invention can also be used when one side of the recording paper is used as the reference. A similar effect can be obtained by slanting the side so that it is facing downward.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a recording paper conveyance path of a double-sided recording apparatus. FIGS. 2a and 2b are side sectional views showing respective states of the recording paper stacking apparatus according to the present invention at the time of stacking and at the end of stacking, respectively. 3 and 4 are views of the main parts of FIG. 2a. 11...Double-sided recording device, 15...Double-sided copy tray, 16...Paper feed section, 23...Transport belt,
24, 24a, 24b...parallel four-bar link, 2
5, 25a, 25b...Crimping roller, 27...Receiving member, 28...Front abutment plate, 29...Blower, 30a...Cam, 31...Right side guide support plate, 32...Left side guide support plate, 33... Notch plate, 33a... Notch, 35... Bell crank,
36a...pressure roller, 37...middle plate, 38...
Paper feed roller, 41...paper feed belt, 42...separation roller, 43...pressing member.

Claims (1)

[Scope of Claims] 1 (a) The toner image formed on the photosensitive drum 4 by the image forming means provided in the copying machine main body 1 is transferred onto the recording paper by the transfer pole 7, and the toner image is transferred to the recording paper by the fixing section 8. (b) re-feeding paper from the tray 15 in order to form a toner image on the other side of the recording paper by the image forming means; (c) an abutting plate 2 provided in the tray 15 and lowered from the recording paper feeding position during recording paper stacking;
(d) When recording sheets are being accumulated in the tray 15, the receiving member 27 of the tray 15 is aligned with respect to the feeding direction of the recording sheets. A paper stacking device for a recording apparatus, characterized in that a cam 30a is provided for causing the recording paper to abut against a guide support plate 31 while being inclined laterally.