JPH0259112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording apparatus having a refeeding means.

Conventionally, refeeding means for double-sided recording devices required a feeding means for refeeding because the transport paths for feeding from sheet stacking means (such as a cassette) and refeeding were different. . There is also a structure that can be used for both feeding and re-feeding, but in this case, it can only handle recording one sheet at a time.

The present invention has been made in view of the above-mentioned conventional example, and an object of the present invention is to provide a recording apparatus having a refeeding means capable of recording a plurality of sheets.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 are enlarged sectional views showing important parts of the conveyance path. In the figure, the document loading table 19
The image of the document placed thereon is illuminated by a halogen lamp 17, and formed by mirrors 16, 15, lens 14, and mirror 13 onto drum 1 covered with an optical semiconductor. The drum 1 is uniformly charged by a charger 12, and after an image is exposed on the drum 1, it is visualized on the drum 1 as a toner image by a developer 2. Then, the visible image is transferred by a transfer charger 8 onto a sheet that is conveyed in a timed manner by a register roller 3, and the latent image and toner image remaining on the drum 1 are then transferred to the drum by a lamp 10 and a cleaner 11. 1 is removed from above. On the other hand, the sheet 7 is stored in a cassette or the like 6, and is sent out by a half-moon-shaped paper feed roller 5 (FIG. 4) and a register roller 3 in synchronization with the toner image on the drum 1, and transferred to the transfer charger. After being transferred at 8, it is separated from the drum 1 by a separation roller 9, and sent to a fixing device 22, such as a heat fixing device, through a conveying section 21.

In the case of normal one-sided copying after fixing, the flap 28 is at the position shown in FIG. 1 (solid line position in FIG.
6 to be carried out. In the case of double-sided copying, for a sheet on which only the front side (one side of both sides) has been copied, move the flap 8 at the position shown by the two-dot chain line in FIG. 2 and turn the solenoid 37 counterclockwise (see FIG. 3). The necessary number of sheets are stored in a second tray 27 for temporary sheet storage, which is integrally formed directly below the first tray 26, by rotating the first tray 26, and then, at an appropriate timing, the reversing rollers facing each other are rotated. The sheets are sequentially separated and discharged by the pairs 29 and 30. The trays include a first tray 26 and a second tray 2.
The integrated two-stage tray system of 7 constitutes a so-called intermediate tray in double-sided copying, and it is also possible to integrate the first and second trays 26 and 27, the separation conveyance section, and the flap mechanism (unitization). If this unit is driven by the drive system of the fixing section, the unit can be easily attached and detached by removing the electrical wiring connector 48 (FIG. 2).
In this case, it is also possible to convert it into a general single-sided copying machine by independently attaching another normal paper ejection unit, such as a paper ejection roller and tray, to the main body. Next, the sheets sent out from the separating and conveying sections 29 and 30 are moved to the overall reference position by diagonal feeding sections 31, 32, 33, and 34 for moving the sheets to the reference position, and then the sheets 7 of the cassette 6 are A spacer roller 75 that keeps the axis and spacing of the paper feed roller 5 constant and is smaller than the system around the outer circumference of the paper feed roller 5.
is guided by guides 33 and 34 to near the tangent line. Next, the timing is determined in the same way as front side copying, and the front side copied sheet is sent out preferentially by the paper feed roller (half-moon roller) 5, and after transfer and fixing, the sheet with the front side copied is sent out preferentially, and after transfer and fixing, the sheet
3 and 24, the paper is carried out onto the first tray 26.

Next, details of each part will be explained. 2 and 3, the paper discharge after the fixing device 22 and the first
A unit section including second trays 26 and 27 (hereinafter also referred to as two-stage tray) and sheet separation and conveyance sections 29 and 30 will be explained. This part is the side plate 47
(Also in the foreground) is a unit with each component attached, and the elongated hole 47 of this side plate 47
₁ is slidably and rotatably indicated on the shaft 45,
The shaft 45 is fixed to a lower stay 80 of the fixing device 22 via a shaft support plate 61 with screws 60. The shaft of the conveying roller 23 passing through the side plate 47 enters into the round notch 64 of the lower plate 46 of the fixing device 22. The driving force is transmitted from the drive gear 22 ₁ of the fuser 22 to the drive gear 2 of the unit by the gear train 22 ₂ (broken line).
2 ₃ , when the sheet is jammed, the entire unit can be opened around the shaft 45 as shown by the arrow 62, and the guide plate 40 is moved around the pin 43, and the first tray 26 is moved around the pin 44. It is becoming more open to the public.

And the whole unit consists of screw 60 and connector 48.
It can be easily removed by pulling it out, and it can also be easily installed.

The sheet exiting the fixing device 22 is separated by a separator 81, passes through a conveyance roller 23, and then passes through a solenoid 3.
7, a lever 36, and a spring 38, the flap mechanism 28 divides the path of the tray.
A predetermined number of sheets, whose front side has been copied during double-sided copying, are temporarily stored in the first tray 26 and the second tray 27 configured in layers, and then the sheets are transferred to the normal rotation roller 30. The sheets are separated and conveyed one by one by a separation conveyance mechanism by a reversing roller 29 facing oppositely thereto. Note that the rollers of this separation and conveyance mechanism may be other types such as a belt that rotates in a phase direction, and a belt has better separation properties. At this stage, these sheets are generally shifted in the axial direction with respect to the position of the toner image on the drum 1, so it is necessary to move such sheets to the reference position and correct them. For this purpose, a diagonal sheet conveyance section is required.

Next, the diagonal conveyance section will be explained with reference to FIGS. 5 and 6. The sheet sent out from the separation conveyance section is attached to a driving roller 31 that is inclined by θ degrees (approximately 10 to 20 degrees) with respect to a reference guide 74 that determines a reference position.
and the driven roller 32 that is in contact with the driving roller 31 under a predetermined pressure by a spring plate 73 that also serves as a bearing, the sheet is pressed against the reference guide 74 side due to the inclination angle θ of both rollers. It will be done. Since the sheet is naturally advanced in a slip state between the sheet and both rollers 31 and 32, an appropriate pressing force and material are selected and used.

In addition, the drive of the diagonal conveyance section is transmitted from other units by a belt or helical gear, etc.
This speed is faster than other process speeds, and corrects and prevents a reduction in copying speed due to the length of the sheet conveyance path during double-sided copying. In addition,
In this case, there is no need to limit it to rollers, and any combination is possible, such as a belt or one belt and the other a guide plate or rollers.

Furthermore, as shown in FIG.
By sharing the lid of the cassette 6 with the driven roller 32, the lower guide plate and the driven roller 32 can be removed together with the cassette 7 or independently. This allows the discharge section to be attached or detached together with the above-mentioned unit or independently.
Jam processing in the diagonal conveyance section becomes easy.

Next, details of the paper feed roller will be explained with reference to FIG. As shown in the figure, the paper feed roller 5 has a half-moon shape with a part of its circumference cut out, and the rollers 75, which are smaller in diameter than the half-moon-shaped paper feed roller 5, are always in contact with the sheets 7 of the cassette etc. 6. They are in contact with each other at a predetermined pressure.
The distance between the half-moon roller 5 and the sheet 7 is kept constant to suppress flapping of the sheet during paper feeding.
At the same time, the sheet that has been brought to the reference position by the diagonal conveyance section is guided by the guide plates 33 and 34 to near the tangent line between the roller 75 and the sheet 7 (a in FIG. 4), so that the next sheet feeding roller 5 is Due to the difference in diameter between the rollers 75 and the half-moon roller 5 during rotation, the double-sided copying sheet (the sheet with the front side copied) is always sent out first.

Also, the starting position of the sheet in the cassette 6 and the starting position of the double-sided copying sheet are at the length l as shown in the figure.
Therefore, if the paper feed roller 5 rotates at the same number of revolutions as in the case of single-sided copying, the amount of feed of the sheet differs by the length l, so the timing register roller 3 when the sheet stops This may result in a difference in the amount of loops formed, and in some cases, problems such as poor paper feeding or bending of the sheet may occur.In this case, the rotation speed of the paper feed roller 5 may be 2 times, 3 times both sides
It is preferable to control the length of the paper feeding section of the half-moon roller 5 so that the length of the paper feeding section of the half-moon roller 5 is changed in a similar manner. Further, as shown in FIG. 7, two or more notches are formed in the paper feed roller,
By using the first divided sheet feeding section 79 and the second divided sheet feeding section 80 as the paper feeding sections, and controlling the number of rotations thereof suitably finely, for example, 2 times for single-sided copying and 2 1/2 times for double-sided copying, etc. A more accurate paper feed length with no difference can be obtained.

Next, referring to FIG. 8, a two-stage tray will be explained. The two-stage tray composed of the first tray 26 and the second tray 27, which is an intermediate tray for double-sided copying, is preferably formed into an integral structure, and is arranged so as to protrude outside the machine. . The first tray 26 has an elongated hole 35 and a notch 3 on the upper surface of the tray.
6, the presence or absence of sheets in the second tray 27 can be checked from above the first tray 26 when making the final copy, and the presence or absence of sheets in the second tray 27 due to double feeding of sheets can be confirmed. It is possible to check for double feeding since it is possible to check which sheets are stacked. Further, the positions of the elongated holes 35 and the notches 36 must be determined by appropriately considering the size of the sheet to be used and the ejection position.

In addition, by arranging a large number of elongated holes 35, the frictional force between the tray surface and the sheet can be reduced, and the notch portion 36 can make it easier to remove the sheet on the first tray 26.

Note that by covering the first tray 26 with a transparent lid, it is possible to prevent dust from touching the sheets of the second tray 27 and to prevent hands from touching the sheets.
Furthermore, the entire two-tiered tray may be made of transparent resin or the like.

Next, referring to FIG. 9, an embodiment in which the tray unit section is dedicated to a single-sided recording machine will be described. The tray unit section 81 includes a first tray 82,
Paper ejection roller 83, static eliminator 84, guide plates 85, 8
It consists of 6 etc. and is detachable from the machine body.
3, 24, first tray 26, second tray 2
7. It can be replaced with a double-sided tray unit consisting of a flap 28, a pair of reversing rollers 29, 30, etc. By replacing this unit, there is almost no need to change or replace other parts, and it can be easily applied as a single-sided or double-sided recording machine. Incidentally, in this embodiment, an example is shown in which the driving roller and driven roller disposed at the upper part of the cassette 6 are excluded. The other parts are numbered the same as in FIG. 1, and their explanation is omitted.

Since the recording apparatus according to the present invention is as described above, it has the advantage of being able to continuously refeed a plurality of sheets with a simplified configuration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment to which the present invention is applied, FIGS. 2 and 3 are enlarged sectional views of the main parts of the conveyance path,
FIG. 4 is a partially enlarged sectional view of the paper feeding section, FIGS. 5 and 6 are a plan view and side view of the diagonal conveying section, FIG. 7 is a partially enlarged sectional view of another paper feeding section, and FIG. 8 is a partially enlarged sectional view of the paper feeding section. FIG. 9 is an enlarged perspective view of the tray section and a sectional view showing another example of a copying machine. In the figure, 6 is a cassette, 26 is a first tray, 27 is a second tray, 33 and 34 are guides,
29 and 30 are a pair of reverse rotation rollers, 81 is a tray unit section, 82 is a first tray, and 83 is a paper discharge roller.

Claims (1)

[Scope of Claims] 1. A sheet loading means that is provided with a lid and is detachable from the apparatus main body; A feeding means that separates and feeds sheets one by one from the sheet loading means; By the feeding means. a recording processing section that records on the fed sheets; a tray means that stacks a plurality of recorded sheets recorded by the recording processing section; and a refeeder that separates and feeds the sheets one by one from the tray means. a feeding means, upper and lower guide plates whose lower guide plates are formed by the lid of the sheet stacking means, and a pair of conveying rollers with driven rollers provided on the lid, and the sheet is fed by the re-feeding means. A recording device comprising a re-feeding means, comprising: a conveying means for guiding the loaded sheet to the sheet stacking means and causing the leading end of the sheet to face below the feeding means.