JPH04129945A - Endless belt conveyer - Google Patents

Abstract

PURPOSE:To effectively prevent a belt walk so as to prevent local damage of a belt end face without receiving an influence to shape of a belt by tilting a belt contact surface of a belt guide means relating to the belt end face. CONSTITUTION:A belt guide means 3a is arranged in an extension direction of an end part of the first driven roll 2 to restrict a belt walk generated toward the guide means 3a on a roll 2a. The guide means 3a, which is an almost cylindrical ring with a tapered belt contact surface 31 formed in the peripheral surface, is fitted to a shaft center member 22 of the roll 2a. The contact surface 31 is raised at an acute angle theta relating to the peripheral surface 15, and the belt 1, in which the belt walk is generated, rides on the contact surface 31 so as to restrict the belt walk. Since force of restricting the belt walk is applied to a belt internal peripheral surface 17a from the guide means, damage of a belt end face 16 can be effectively prevented by applying the restricting force to wide dispersedly act on the belt 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a conveying device for preventing rotation of an endless belt, and more particularly to an opening of a conveying device having means for preventing meandering of the belt.

[Prior Art] FIG. 12 shows an example of a color electrophotographic copying machine that uses a beltless belt to convey a recording sheet.

Specifically, an endless belt 1 (hereinafter F
, belt), and four sets of visible image forming units 9 that form toner images (visible images) corresponding to each color of cyan, magenta, yellow, and black by an electrophotographic process are attached to the endless belt 1. They are arranged on one side at appropriate intervals. Each visible image forming unit 9 is
A charger 9 is installed around an electrostatic latent image carrier 91 such as a photoreceptor drum.
2. Latent image writing means 93, developer 94 and cleaner 9
5 is arranged, and a toner image corresponding to image information of each color is formed on an electrostatic latent image carrier 91, and the toner image is pressure-transferred onto a recording sheet 8 conveyed by the belt 1. It has become.

Therefore, the recording sheet 8 carried out from the supply tray 6a is
After being held by belt 1 at a predetermined timing, belt 1
As the process progresses, each visible image forming unit 9,9. ...
The toner images of each color are sequentially transferred from
The recording sheets 1 to 8, which carry the images, and the recording sheets 1 to 8, which have completed the transfer of the toner images, are peeled off from the belt 1 and sent out through the fixing device 7 onto the output tray 6b. Now, the formation of the color recorded image is completed! do.

In FIG. 12, numeral 41 is a roller for sucking the recording sheet 8 onto the bells 1 to 1 at a predetermined timing, and numeral 96 is for nipping the recording sheet 8 onto the electrostatic latent image carrier 91. Pressure [1-ru, code 42 is a cleaner that removes dirt from the surface of bells 1 to 1, code 5 is a tension adjustment after applying a constant tension to bells 1 to 1 (21-ru) .

In this image forming method in which a plurality of toner images are multiple-transferred onto the recording sheet 1~, the premise of forming a high-quality recorded image without color shift is that the recording sheet 1~ moves exactly 1F along a predetermined path. It is important to be transported. Therefore, it is necessary that the belt that generally covers the recording sheets 1 to 1 does not move in the width direction when rotating.

However, the widthwise movement of the belt is
- It is virtually impossible to completely prevent this problem due to imperfections in the molding of the bells, the parallelism of the bell groups, etc.

Therefore, in conventional belt conveying devices, several measures have been proposed to prevent belt meandering (hereinafter referred to as bell 1 to walk) by restricting movement of the belt in the width direction in roll 1. .

For example, as shown in FIG. 10, a non-rotating guide member 1 is fixed to a frame e at one end of a cylindrical rigid body, and a stretched bell 1 or the above-mentioned guide member 1 is attached to the frame e. There is a known means for adjusting the angle of each roll so as to cause the belt to walk in the direction of the guide. It will be held in a predetermined position with respect to the surface.

However, with this method, the bell (1) is caught by the force that is trying to generate the pelt water and is pushed against the kite member, so a large external force is applied to the end of the belt and the bell (-) ■Or maybe it's a drawback that it easily causes damage.

Therefore, we have taken measures to overcome these shortcomings - C1 JP-A-Sho! A bell 1 to support conveyance device as shown in Japanese Patent No. +8-177811 has been proposed. Specifically, the first
As shown in Figures 1 (A) and (B), an elastic petal f whose circumference is divided into four by placing it on the core part + Aq is arranged spirally, and a roll formed into a substantially cylindrical shape (hereinafter referred to as [- 1-1-1''-
). According to a device that combines this 1-1-[1''-rule and the guide member shown in Figure 1(), when the stretched belt comes into contact with the guide member and is about to buckle, the elastic The petal buckles and the external force acting on the belt is weakened, reducing the damage done to the belt.3.
Therefore, it has become possible to reduce belt torsion while preventing damage to the belt. .

[Problems to be Solved by the Invention] However, when the movement of the bell is restricted by the kite member as described above, the following inconvenience occurs. In other words, the pel 1 to the end surface that the kite part + AI'J comes into contact with must be formed completely straight, or the guide member must be formed as shown in (A) and (8). If you race the old end face of the watermelon, conversely, the guide member will apply an external force to the belt d, and the belt d
The upper point △ moves to the point △- as shown in FIG. It was essential to avoid pelt distortion due to imperfections in the process.

In addition, in conventional kite members, the force that restricts Peltoe A-- acts directly on the belt end surface, so if the shape of the belt end surface is undulated as shown in -1, stress may be applied to a part of the belt end surface. There was a problem in that the particles were concentrated, causing local damage to the part concerned.

The present invention has been made in view of these problems, and its purpose is to effectively prevent the occurrence of belt failure without being affected by the shape of the belt. It is an object of the present invention to provide an endless bell 1 to a conveying device which can prevent local damage to the end surface of the belt.

[Means for Solving the Problems 1-1] In order to achieve the object 1-1, the two-seatless belt conveying device of the present invention comprises a plurality of two-seatless belts that are stretched and rotated; [above] - pertonotide means that comes into contact with the side part of the bell 1 and restricts movement of the bell 1 in the width direction;
The belt 1 is characterized in that the contact surface is slanted relative to the end surface of the belt.

With such technical means, it is possible to land on the inner circumferential surface of the bell 1 or on the contact surface of the bell 1.
Movement of the bell 1 in the width direction, that is, movement of the bell 1 in the width direction, is prevented. Therefore, as long as the above-mentioned bell 1 to powering means have a bell inclined with respect to one end surface of the bell 1 and a contact surface, the structure may be changed as appropriate; From the viewpoint of suppressing wear of the belt due to sliding contact between the belt 1 and the contact surface and extending the life of the belt 1, it is preferable that the means has a structure in which the blade rotates while being carried around by the belt. .

Also, as for the inclination angle of the above-mentioned Pel 1 to the contact surface, as mentioned in -1-, it is possible for the Pel 1 to ride on the belt contact surface on the inner periphery. Although it may be changed, based on the results obtained by the inventors' experiments, the upright angle with respect to the belt outer circumferential surface is 5° to 45°.
It is preferable to set it to . The details of this experiment will be described later.

Further, the bell 1 to the guide means may be arranged only on one side of the belt, or may be arranged on both sides.

However, if only one side is provided and covered, the belt must be stretched in advance so that the belt walks toward the belt guide means because it is necessary to always keep the belt in contact with the belt kite means.

Further, the endless belt may be made of any material and of any structure.

Examples include semi-dielectric or dielectric electrostatic adsorption bells 1 to 1 for conveying recording sheets such as paper, ink recording media in transfer recording devices, and bell L-shaped photoreceptors in electrophotographic recording devices.

[Work] The technical means described above operate as follows.

By making the abutting surface of the bell 1 to the bell 1 of the powering means incline with respect to one end surface of the bell 1, the inner circumferential surface of the belt rides on the abutting surface, and the bell 1 to the bell 1 is regulated by .DELTA.-. Therefore, it is possible to prevent the belt guide means from being stiffened due to incomplete molding of one end surface of the bell 1, thereby preventing the bell 1 from being damaged.

In addition, since the force applied from the peruhegaite means to bell 1~ is received by the inward surface of bell 1~, the force applied to bell 1~
The force is not concentrated only on one part of the edge, and local damage to the edges is prevented.

[Example 1 Hereinafter, the entrance bell 1 of the present invention is constructed based on the attached drawings.
~ Detailed explanation of the conveyor head cover.

FIG. 2 shows a schematic structure of the seatless belt conveying device of the present invention, which is applicable to the recording sheet 1 to the conveying mechanism of the color image forming apparatus shown in FIG. 12.

Specifically, a drive roll 4 connected to the seventh wheel 14 and moving together in the direction of the arrow, and a first driven roll [21- Le 2a and Bell 1
second and third driven rolls 2b and 2c that rotate as the bells 1 to 1 are conveyed, and a tension adjustment roll that is biased towards the bells 1 to 1 and applies a constant tension to the bells 1 to 1. 5, and bells 1 to 1, which carry and convey recording sheets 1 to 1 by these roll groups, are stretched.

The bells 1 to 1 above hold the recording sheets 1 to 1 with electrostatic adsorption force.
It is an annular body to be transported, and as shown in FIG. electrode 1
3 are buried in parallel. Further, the electrode 13 is exposed to the inner layer 11 at the end of the belt in the width direction,
The frame is such that a plurality of one-line power feeders (not shown) can be brought into sliding contact with the exposed portion 14 to supply electricity to each electrode 13. Therefore, by alternately applying a low voltage and a high voltage to the arranged brush power feeders, an electric field is formed between the electrodes 13, 13, etc., and the recording sheet is electrostatically attracted and covered on the surface of the outer layer 12. It is possible.

FIG. 1 shows a first embodiment of belt kite means 3 according to the present invention. In this embodiment, the C1 belt guide means 3a is disposed in the direction of extension of the end of the first driven roll 2a, and is adapted to restrict the pelt water generated from the roll 2a toward the bell 1 to the guide means 3a. There is.

The first driven roll 2a has approximately the same structure as the conventional ILF roll shown in FIG.
The elastic petal 21 divided into four parts in the circumferential direction is connected to the core part vJ2.
A plurality of them are arranged around 2. The only difference from the LIF roll shown in FIG. 11 is that the elastic belt 21 is not spirally arranged, but is arranged perpendicularly to the rotation axis of the D-rule 2a. This first driven roll 2a is connected to the frame 10a via a rotating bearing 23.
10b.

Further, the belt guide means 3a is a substantially cylindrical ring having a tapered belt contact surface 31 formed on its outer peripheral surface, and is connected to the first driven roll 2a via a rotary bearing 32.
It fits into the support core vJ22. Above belt contact surface 3
1 stands up at an acute angle of 0 to the belt outer peripheral surface 15,
The belt 1 which has avoided the belt torsion Δ rides on the contact surface 31 and the belt walk is regulated.

In this embodiment, since the belt guide means 3a is disposed only on one side of the first driven roll 2a, the belt guide means 3a is provided only on one side of the first driven roll 2a or the other rolls 2b, 2cb, .
The arrangement angles of the bells 1 to 1 are adjusted so that the bells 1 to 1 always have biasing force toward the belt guide means 3a. For this reason, the bells l to 1 that are hung and rotated on the first driven roll 2a always have their side ends riding on the belt guide means 3a, and also move while rotating the belt guide means 3. .

FIG. 4 shows a second embodiment of the belt guide means 3.

In this embodiment, the shape of the belt guide means 3b is substantially the same as that of the first embodiment, or it is fixed to the shaft core member 22 of the first driven roll 2a with a screw rest 33,
It is integrated with the first driven roll 2a. Therefore, in this second embodiment as well, the bell 1 to the guide means 3b are rotated by the belt 1.

FIG. 5 shows a third embodiment of the belt guide means 3.

In this embodiment, the belt guide means 3C is rotatably fitted to the shaft core member 22 of the first driven roll 2a as in the first embodiment, but one end thereof is connected to the frame 10b by a screw 34. has been done. Therefore, the belt guide means 3C is non-rotating, and the belt 1 is
1 and 1 progress, and belt walking is regulated.

In FIGS. 4 and 5, the same parts as those shown in FIG.

In the above-described configuration, in the endless belt 1 general feeding device of this embodiment, the belt 1 is moved by having the end of the bell rest on the bell mill contact surface 31 which is inclined with respect to the belt end surface 16. Because Hewoke is prevented [1-,
The belt inner circumferential surface 17 instead of the belt end surface 16 comes into contact with the belt abutting surface 31, and due to incomplete molding of the end surface 16 to the bell L, the belt guide means 3 or the belt 1 to A
- There will be no need to confuse people.

]3 In addition, the force for regulating the Peltoe A-ri is provided by the belt guide means 3.
Since the regulating force is applied to the inner peripheral surface 17 of the belt, the regulating force acts in a widely distributed manner on the bell l-1, and damage to the end surface 16 of the belt can be effectively prevented.

Next, the inventors of the present application examined the three types of belt guide means 3a and 3b described above in order to confirm the effect of controlling Peltoe A due to the difference in the upright angle θ of the belt contact surface 31.

An experiment was conducted to measure the actual belt walking amount using an endless belt conveying device equipped with 3C.

In the experiment, the upright angle θ of the belt contact surface 31 was changed, and the belt 1 was rotated once at two points near the drive roll 4 and the first driven roll 2a (points A and B in FIG. 1). The amount of peltow A was measured.

Fig. 6 shows the experimental results using the belt guide means 3a (first embodiment), Fig. 7 shows the experimental results using the belt guide means 3b (second embodiment), and Fig. 8 shows the experimental results using the belt guide means 3c.
(Third Example) Experimental results are shown. In the graph showing the experimental results, the horizontal axis is the upright angle θ of the belt contact surface 31, and the vertical axis is the maximum value of the amount of Peltouger that occurred during one rotation of the belt 1.

As is clear from each graph, when the rising angle θ of the belt contact surface 31 is 5 to 45 degrees, the belt 1 to A is most effectively
In particular, in the first and second embodiments, the belt load A is 150 at both measurement points.
It was less than μm F, and the effect of the present invention was more than confirmed.

Moreover, from the experimental results, it can be seen that when the standing angle θ exceeds 45°, the Bell's angle A tends to increase rapidly. This is thought to be because as the upright angle increases, the belt end surface 16 and the belt abutment surface 31 come into contact with each other, resulting in poor molding of the belt end surface 16 or belt torsion, similar to the conventional guide member.

Furthermore, in the third actual measurement, the non-rotating belt guide means 3
When C is used, a rotating vermilkite means 3a
, 3b, it was also confirmed that the effect of controlling Peltower A was smaller than that of 3b.

[Effect of the invention] As explained above, endless bells 1 to 1 of the present invention
According to the conveying device, the inner circumferential surface of the belt rides on the belt contact surface of the bell 1 to the guide means and the belt is restricted, so the G-plane is affected by the imperfection of the forming of the belt end surface. It becomes possible to effectively prevent Peltower A-ri without causing any damage.

In addition, since the force that restricts Peltower A-ri is dispersed over the inner circumferential surface of the belt, there is no local damage to the end surface of the belt, making it possible to extend the life of the belt.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main parts of a first embodiment of a conveying device for endless bells 1 of the present invention, FIG. 2 is a schematic configuration diagram of a conveying device for endless bells 1 to m of the present invention, and FIG. I
FIG. 4 is a perspective view showing the seatless bell 1 of the present invention.
- A diagram showing the main part of the second embodiment of the transport device, Fig. 5 is a diagram showing the main part of the third embodiment of the 1-entrespel 1 - transport device of the present invention, and Fig. 6 shows the experiment of the first embodiment. Graph showing the results,
Fig. 7 is a graph showing the experimental results of the second embodiment, Fig. 8 is a graph showing the experimental results of the third embodiment, and Fig. 9 is a graph showing the cause of the belt-tow gag caused by J5 in the conventional galloid section No. 4. Figures 10 and 11 are diagrams showing the main parts of the conventional]-Raddress Bell 1 to 1 general feeding device, and Figure 12 is an image constructed using the old Raddress Bell 1 general feeding device. It is a schematic diagram of a forming device. [Explanation of symbols] 1: Bell (~(]less belt) 2a: First driven roll 3: Belt guide means 15: Belt guide 16: Belt end surface 31: Belt contact surface

Claims (1)

[Claims] Multiple rolls that rotate by stretching an endless belt,
In the endless belt conveying device, the belt guide means is provided with a belt guide means that comes into contact with the side end of the endless belt to restrict movement of the belt in the width direction. An endless belt conveyor device characterized by its inclination.