JPS62269154A - Conveying device for copying paper - Google Patents

Abstract

PURPOSE:To reduce the width of inflection of transfer paper between a conveying device and a fixing device by absorbing the difference the transfer speed of a photosensitive body and the fixing speed of the fixing device even when the transfer speed is made high. CONSTITUTION:When the copying paper 1 to which a visible toner image is transferred from the photosensitive body 7 is conveyed to the fixing device 8 by the conveying device C, the conveying speed Vd' of a conveyor belt A, the conveying speed Vt of a conveyor belt B, and the fixing speed Vf of the fixing device 8 are different from one another, so the copying paper 1 flexes bit by bit in moving from the conveyor belt A to the conveyor belt B and in moving from the conveyor belt B to the fixing device 8 and the flexing absorbs the conveying speed difference, so that the copying paper 1 is conveyed to the fixing device 8 while reduced in speed gradually. Consequently, the inflection width of the copying paper 1 between the conveying device C and fixing device 8 (vertical with of inflection) is reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION 3. Industrial Application Field of the Invention The present invention relates to a copy paper conveying device in a copying machine.

2. Description of the Related Art A copy paper conveying device according to the present invention is a copy paper that is placed between a photoreceptor and a fixing device of a copying machine, and transports the copy paper onto which a visible toner image has been transferred from the photoreceptor, and transfers the visible toner image to the surface of the copy paper. This is a device that conveys the image while sucking it to a fixing device for fixing the image using pressure and heat.

Conventionally, as shown in FIG.
A plurality of rollers 4 for conveying the copy paper 1 are placed between a plurality of sets of rollers 4 arranged perpendicularly to the conveyance direction of the copy paper 1 with a saccilane box 3 having a rear hole 2 bored therein for suctioning the copy paper 1. A so-called numbered belt type conveyor belt +A, which has a book belt 5 around it, is often used.

The inside of the saxiran box 3 is kept negative and positive by operating a fan, a blower (not shown), etc., and the copy paper 1 is placed around the surface of the saxiran box 3 through the suction hole 2. It is attracted to the surface of the belt 5. Further, by rotating the roller 4 and driving the belt 5, the copy paper 1 is conveyed while being attracted by the conveyor belt A. Incidentally, the belt 5 may also be provided with suction holes 6 to increase the suction force against the copy paper l.

The conveying speed of the copy paper conveying device configured as described above is set to a speed substantially equal to the rotational peripheral speed of the photoreceptor, in other words, the transfer speed.

This is to prevent problems such as misalignment of the toner image with respect to the surface of the copy paper when the visible toner image is transferred from the photoreceptor to the copy paper.

On the other hand, the fixing speed of the fixing device is set to be slightly slower than the transfer speed of the photoreceptor.

Problems with the Prior Art In recent years, as the transfer speed of photoreceptors has increased, the conveyance speed of the conveyance device has also tended to increase. However, in order to reliably fix the visible toner image on the surface of the copy paper, it is necessary to ensure a certain fixing time, and it is extremely difficult to increase the fixing speed in the fixing device in proportion to the conveying speed. Therefore, when the transfer speed is increased, the speed difference between the copy paper conveyance speed and the fixing speed increases, and the copy paper conveyed by the conveyance device is transferred between the conveyance device and the fixing device. This will cause the paper to bend significantly.

As a result, problems such as the copy paper becoming wrinkled, coming into contact with a member protruding inside the main body of the copying machine, and causing the toner image on the copy paper to smear occur.

Purpose of the Invention The present invention has been devised in view of the above circumstances, and even if the transfer speed on the photoreceptor is increased, the conveyance speed is improved by absorbing the speed difference between the transfer speed and the fixing speed in the fixing device. It is an object of the present invention to provide a copy paper conveying device that can reduce the amount of deflection of copy paper between the device and the fixing device.

Structure of the Invention The main means adopted by the present invention to achieve the above object is that the photoconductor of a copying machine and a fixing device whose circumferential speed is set to be lower than the circumferential speed of the photoconductor. In a copy paper conveyance device that is provided with a conveyance means for conveying the copy paper to a fixing device while sucking the copy paper after transfer, the conveyance means decelerates the conveyance speed of the copy paper in multiple stages and conveys the copy paper. This is a copy paper conveying device related to the above.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

It should be noted that the following examples are examples embodying the present invention, and are not intended to limit the technical scope of the present invention.

Here, FIG. 1 is a perspective view of a conventional conveyance belt that can be used in a conveyance device according to an embodiment of the present invention, FIG. 2 is a schematic side view of the conveyance device according to the above embodiment, and FIG. A perspective view of a conveyor belt that can be used in a conveyor device according to another embodiment of the present invention, FIG. 4 is a sectional view taken along the line GG in FIG. 3, and FIG. FIG. 6 is a perspective view of a conveying device according to still another embodiment of the present invention, and FIG. 7 is a sectional view taken in the direction of arrow H.

In the copy paper conveying device of the present invention, which serves as a means for absorbing the speed difference between the high-speed transfer speed of the photoreceptor and the fixing speed of the fixing device, the above-mentioned purpose is achieved by reducing the copy paper conveyance speed in two stages. A case in which this is achieved will be explained below.

First, as a first embodiment, two stages of conveyor belts (A), which are arranged separately in the copy paper conveyance direction and have different speeds,
A copy paper conveyance device C constituted by B will be described.

As shown in FIG. 1 and FIG. 2, the copy paper conveyance device C in this embodiment has the above-mentioned conveyance belts with different conveyance speeds.
It is constructed by separately arranging two conveyor belts in the copy paper conveyance direction: a conveyor belt A and a conveyor belt B having the same structure as the conveyor belt A).

The conveying speed of the conveying bell A disposed on the photoreceptor 7Ill of the conveying device C is the transfer speed v of the photoreceptor 7.
The speed is set to vJ', which is approximately equal to J. On the other hand, the conveyance speed of the fixing device 8 (conveyance bell disposed at FJ) B is slower than the conveyance speed v J/'゛ of the above-mentioned waist conveyance bell) A (
, the fixing speed Vf of the fixing device 8 is set to be slightly faster than the fixing speed 'vf' of the fixing device 8.

As a result, the magnitude relationship among the above-mentioned speeds is vJΣV,／>>
Vt≧vf. Further, the suction force of the conveyor belt A and the conveyor belt B on the copy paper 1 is set such that the suction force of the conveyor belt B is set to be weaker than the suction force of the conveyor belt A. This is intended to increase the slippage between the belt B and the belt B. As described above, the copy paper conveyance device C in this embodiment
is configured.

Therefore, the copy paper 1 onto which the visible toner image has been transferred by the photoreceptor 7
is transported to the fixing device by the transport device C,
As mentioned above, the conveyance speed V, / of the conveyor belt A,
Conveying speed of conveyor belt B and ■.

and the fixing speed vI of the fixing device 8 are different from each other, and the speeds are reduced in the order of 1 conveyor belt A, conveyor belt B, and fixer 8, so the above-mentioned "copy paper" is different from the conveyor belt).
When transferring from conveyor belt A to conveyor belt B, and from conveyor belt B to fixing device 8, the copy paper 1 is slightly deflected, and this deflection absorbs the difference in conveyance speed. The copy paper 1 is conveyed to the fixing device 8 while gradually decelerating. Therefore, reducing the deflection width (width in the vertical direction of tQ) of the copy paper l between the conveyance device C and the fixing device 8 makes it burnable.

Next, as a second embodiment, two types of conveyor belts (1) with different speeds are arranged so as to be overlapped in the copy paper conveyance direction.
9. The copy paper conveyance device fD constructed by 20 will be explained based on FIGS. 3 to 5.

It should be noted that this conveying device can be constructed more compactly and at lower cost than the intermediate conveying device C while maintaining the same effects as the above-mentioned conveying device C (FIG. 2).

First, the notches lO, 11 are alternately arranged in the copy paper conveying direction.
A guide plate 12 is fixed to the saccilane box 9. The guide plate 12 is provided with a suction hole 2 for suctioning the copy paper 1. Further, a drive shaft 13 (on the photoreceptor side) and a driven shaft 14 (on the fixing device side) are configured to be rotatable at right angles to the conveyance direction of the copy paper 1 with the sacsiran box 9 in between. A large-diameter driving roller 15 is fixed on the drive shaft 13 corresponding to the notch 10 provided on the fixing device side of the guide plate 12.
A driven roller 16 is rotatably mounted on a driven shaft 14 corresponding to the driven shaft 14 . On the other hand, a small-diameter driving roller 17 having a smaller diameter than the large-diameter roller 15 is fixed on the drive shaft 13 corresponding to the notch 11 provided on the photoreceptor side of the guide plate 12;
A driven roller 18 is rotatably mounted on the driven shaft 14 corresponding to the notch 11.

Furthermore, between each of the rollers I5 and 16, and between 17 and 18, a plurality of conveyor belts 19.20 for conveying the copy paper l are fitted into the notch portions 10.11, respectively. In some parts, the belt is attached so that the surface of the belt is located below the upper surface of the guide plate 12. Since rollers 15 and 17 are provided alternately and rollers 16 and 18 are also provided alternately, conveyor belts 19 and 20 are also provided alternately.

The outer diameter of the large-diameter driving roller 15 is such that when the drive shaft 13 is driven to rotate, the conveyance belt 19 has a conveyance speed V that is approximately equal to the transfer speed Va of the photoreceptor (not shown). / is set to be driven. Also,
The outer diameter dimension of the small diameter driving roller 17 is the same as that of the driving shaft 1.
3, the conveyor belt 20 has a conveyance speed vt which is slower than the conveyance speed V of the conveyor belt 19 and slightly faster than the fixing speed V of the fixing device (not shown).
It is set to be driven by

As a result, the magnitude relationship of each of the above-mentioned speeds is V4 N!, similar to the above-mentioned conveyance device C. V, 1'>>V,> Vl and null.

The inside of the saxiran box 9 is maintained at negative pressure by operating a fan or blower (1!l not shown), etc., and the copy paper 1 is fixed to the surface of the saxiran box 3 through the suction hole 2. It is also possible to provide suction holes 6 in the conveyor belt 19, 20 to increase the suction force against the copy paper 1.

The copy paper conveyance device configured as described above is
On the photoreceptor side, as shown in FIG.
, / contacts the copy paper 1, and on the fixing device side, as shown in FIG. 5, only the transport belt 20 driven at a transport speed V contacts the copy paper 1. .

Since the conveyor belt 20 is inserted into the notch 11 from the center of the conveyor to the photoconductor side, the copy paper l supplied from the photoconductor side is attracted only to the conveyor belt 19 (m The conveyor belt 19 is inserted into the notch 10 from the center of the conveyance device to the fixing device side, and the copy paper is separated from the copy paper 1. 1 is conveyed to the conveyor belt 20 at a speed vt.

Therefore, when the copy paper 1 onto which the visible toner image has been transferred by the photoreceptor is sucked and conveyed to the fixing device by the above-mentioned conveyance device, the conveyance speed of the conveyance belt 19 is vJ, as in the case of the above-mentioned conveyance device IC. ', the conveying speed vt of the conveying belt 20, and the fixing speed V of the fixing device are different, and the conveying belt)19. IQ feed belt 20. The speed is reduced in the order of the fixing device (therefore, when the copy paper 1 moves from the upper surface of the conveyor belt 19 to the upper surface of the conveyor belt 20, and when the copy paper 1 moves from the upper surface of the conveyor belt 20 to the fixing device, A small deflection occurs in each copy paper 1, and the copy paper 1 is transported to the fixing device while absorbing the difference in transport speed and gradually decelerating. Therefore, it is unavoidable to reduce the deflection width of the copy paper 1 in the vertical direction between the conveying device and the fixing device.

Furthermore, since the conveying device having the above structure is composed of one saxiran box 9, it is more compact and less expensive than the conveying device C (FIG. 2) which is composed of two saxiran boxes. It becomes usable if it is configured as follows.

Furthermore, as a third embodiment, by cutting off the suction force that attracts the copy paper and bending the copy paper over a wide area, the transport speed of the copy paper is reduced and the vertical deflection width of the copy paper is reduced. A copy paper conveyance device E that can reduce the size of the copy paper will be described.

As shown in FIG. 6, the copy paper conveyance device E in this embodiment includes a conveyor belt F, which has the same basic structure and suction action on the copy paper as the conveyor belt A (FIG. 1), and A guide bar 21 which is located on the fixing device side of the transport bell) F and pushes up the copy paper 1, and the guide bar 21 is connected to a shaft 22. The solenoid 24 is configured to be driven in the vertical direction via a link lever 23. The solenoid 24 is provided on the fixing device side of the conveyor belt F.
A groove 25 is provided to accommodate the tip of the guide bar 21 when the guide bar 21 is turned off.

Next, the operation of the copy paper conveying device E having the above structure will be explained as shown in FIG. 7+a1. The explanation will be based on Cb).

The conveyance speed of the belt 26 (61st!I reference) of the conveyance device E is approximately equal to the transfer speed V- of the photoreceptor 7, vj
’ is set. The conveying speed vJ' is faster than the fixing speed V of the fixing device 8. And the magnitude relationship of each speed above is vJ=V, 1'>>
v.

First, the copy paper 1, onto which a visible toner image has been transferred by the photoreceptor 7, is conveyed by the conveyance device at a conveyance speed V, / (FIG. 7(al)).

Then, when the leading edge of the copy paper l is held by the fixing device 8 driven at the fixing speed V#, the solenoid 24 is turned on and the link lever 23 is swung in the direction of the arrow 27 ( Figure 6).

Then, the copy paper 1 is pushed upward over a wide range by the guide bar 21 interlocking with the link lever 23 (61st!) via the shaft 22, and the suction force from the conveyance device E is cut off. (No. 71 J (bl)
.

As a result, the conveyance speed of the copy paper 1 is instantaneously decelerated from V to V, and the copy paper 1 is conveyed to the fixing device while being thick (and flexed).

Therefore, it is possible to reduce the amount of deflection of the copy paper 1 in the vertical direction between the transport device E and the fixing device 8.

Effects of the Invention As described above, the present invention is provided between the photoreceptor of a copying machine and the fixing device, which is set at a peripheral speed lower than the peripheral speed of the photoreceptor, and which sucks the copy paper after transfer. A copy paper conveyance device comprising a conveyance means for conveying the copy paper to a fixing device while transporting the copy paper, wherein the conveyance means reduces the conveyance speed of the copy paper in multiple stages and conveys the copy paper. Therefore, even if the transfer speed on the photoreceptor is increased, the speed difference between the transfer speed and the fixing speed in the fixing device can be absorbed, and the vertical direction of the copy paper between the conveying device and the fixing device can be absorbed. This allows the width of deflection to be reduced. By reducing the deflection width of the copy paper, problems such as the copy paper becoming wrinkled or coming into contact with a member protruding inside the copying machine main body and causing the toner image on the copy paper to smear. will also be resolved.

[Brief explanation of the drawing]

1 is a perspective view of a conventional conveyor belt that can be used in a conveyor according to an embodiment of the present invention, 211J is a schematic side view of the conveyor according to the above embodiment, and FIG. 3 is a perspective view of a conventional conveyor belt that can be used in a conveyor according to an embodiment of the present invention. A perspective view of a conveyor belt that can be used in a conveyance device according to another embodiment, FIG. 4 is a cross-sectional view taken along the line GG in FIG. 3, and FIG. 5 is a cross-sectional view taken along the line H-H in FIG. 3. , 6th
The figure is a perspective view of a conveying device according to still another embodiment of the present invention,
FIG. 7(5) (bl is an explanatory diagram of the operation according to the above embodiment. (Explanation of symbols) 1... Copy paper 2... Suction hole 3...
Saxiran box 4...Roller 5...Belt
6... Suction hole 7... Photoreceptor
8...Fixing device 9...Saxiran box 1
0.11... Notch 12... Guide plate 1
3... Drive shaft 14... Driven wheel 15... Large diameter roller for driving 16... Driven roller 1
7... Small diameter drive roller 18... Followed roller 19
．． 20... Conveyor belt 21... Guide bar 22.
...Shaft 23-...Link lever 24...Solenoid 25...Groove 26...
・Belt 27...Arrows A, B, F...
Conveyor belts C, D, E...Copy paper conveyor.

Claims (4)

[Claims] (1) A conveyance means that is located between the photoconductor of the copying machine and a fixing device set at a circumferential speed lower than the circumferential speed of the photoconductor, and conveys the transferred copy paper to the fixing device while sucking the copy paper. 1. A copy paper conveyance apparatus comprising: a copy paper conveyance apparatus, wherein the conveyance means conveys the copy paper by reducing the conveyance speed of the copy paper in multiple stages. (2) The copy paper conveyance device according to claim 1, wherein the conveyance means is constituted by a plurality of conveyance belts having different speeds and arranged separately in the copy paper conveyance direction. (3) The copy paper conveyance device according to claim 1, wherein the conveyance means is constituted by a plurality of conveyance belts having different speeds and arranged in an overlapping manner in the copy paper conveyance direction. (4) The copy paper conveyance device according to claim 1, wherein the conveyance means reduces the conveyance speed of the copy paper by cutting off the suction force that attracts the copy paper.