JPS58100145A - Correcting device for zigzagging of endless belt - Google Patents

Abstract

PURPOSE:To correct the displacement and zigzagging of an endless belt in the direction of the shaft of a body of revolution by providing a photoreceptor belt used for a microfilm printer, etc., with a displacing means for displacing the body of revolution in such a direction that the extended and supported endless belt is loosened. CONSTITUTION:A photoreceptor belt 1 when running in contact with the flange 30 of a roller 3 by being displaced to an end part in a roller shaft direction is further diaplaced and floats. At this time, when the photoreceptor 1 is loosened through the operation of cams 26 and 27, the photoreceptor 1 is placed in a free state and the part floating in contact with the flange 30 is pressed back by the flange 30 to the center part of the roller 30. Even after the belt 1 is loosened while the bent does not zigzag, the belt 1 is extended and supported again at the position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an endless belt meandering correction device for correcting displacement of the belt in the axial direction of the rotating body, which occurs when the endless belt is stretched and supported by the rotating body. It is related to.

Below, microfilm li is used as an endless belt.
This will be explained by taking as an example a photoreceptor belt used in a printer that enlarges an image and obtains a copy of it.

Conventionally, in electrophotographic printers that use a sheet-like belt tracker as a photoreceptor, the ratio of the length in the width direction to the length in the belt feeding direction is large, so when the belt is fed, there is a A deviation or meandering of the belt occurs in the perpendicular direction, that is, in the axial direction of the cylindrical roller that tensions and supports the belt. For this reason, there is a risk that the belt may protrude beyond the edge of the roller, causing damage to the edge of a sheet-like belt that is easily damaged, such as a photoreceptor belt. Here, if the cylindrical roller that tensions and supports the photoreceptor belt has a perfect cylindrical shape and is in a flat position, and the belt itself is also made perfectly flat, the above problem will not occur. However, in reality, it is difficult to achieve such precision in machining, resulting in meandering.

Therefore, conventionally, in order to correct such meandering of the belt, for example, a sensing member is provided for the displacement of the belt in the axial direction of the roller, and when the belt starts meandering, this sensing member senses and tilts the belt support roller. One idea was to return the belt to its original position and control the displacement of the belt in the axial direction of the roller. Alternatively, there are methods in which a crown is attached to the support roller of the belt, but all of them have complicated mechanisms, are not stretchable, and are not suitable for thin and easily damaged materials such as photoreceptor belts.

SUMMARY OF THE INVENTION Therefore, the present invention provides a meandering correction device that is capable of correcting the meandering of an endless belt with little elasticity using a mechanism that is simpler than conventional methods.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows Microfilm II! A schematic diagram of a microprinter for enlarging an i image and obtaining a copy image f# thereof is shown. FIG. 2 is a perspective view of the photoreceptor belt unit.

In the figure, l is a photoreceptor belt. The photoreceptor belt 1 is formed by vapor-depositing aluminum on a Mylar substrate and coating it with zinc oxide. Further, reference numeral 2 denotes a drive roller, which is connected to the drive system on the main body side via a clutch 26 so as to run the belt 1 at a proper timing. Further, reference numeral 3 denotes a driven roller, which is provided parallel to and opposite to the row 22, and supports the belt 1 under tension. Thereupon, the belt 1 is passed over these rollers 2 and 3 and runs in the direction of arrow 15 by the rotation of the drive roller 2. Furthermore, this roller 2・
It is rotatably supported by the shafts 2a and 3aFi of No. 3 and support frames 18 and 19. Therefore, this photoreceptor bell) It
Then, feed is started in the direction of arrow 15 by the print signal issued by the print button (not shown) ONK.
First, the display base B, which has been uniformly charged by the charging means A, is inquired. At this time, the illumination system 4 as a light source is turned off. Then, when the leading end of the charged belt 1 passes through B-1, the belt) It1 is temporarily stopped. At that time, the illumination thread 4ti is turned on, and the microfilm 50g1#'i illuminated by this is illuminated by the belt 1 by the projection lens 6.
It is enlarged and projected onto part B of
fJI is formed. After this, the belt 1 starts moving in the 15 direction again, and the latent film formed on the belt 1 is developed in the visual imaging means CK. Then, in section D, the grain developed by the developing means C is transferred onto the paper 9 which has been guided by the guide plate lO.11 from the direction of the arrow 16.

In the folding section, 12 is a transfer discharger, and 13 is a separation discharger for separating the paper 9 from the photoreceptor belt 1. After passing through DfiS, the belt 1 is cleaned to remove residual toner on the photoreceptor in a cleaning machine jiE.
It stops after moving to the fixed position. On the other hand, after the image is transferred in the D section, the paper 9 is conveyed to the fixing section PK by the conveyor belt 14, the transferred image is fixed on the paper 9, and the paper 9 is discharged in the direction of the arrow 17.

Next, referring to FIG. 2, an embodiment of the present invention for correcting the meandering of the traveling bell 1 will be shown.

In this embodiment, both NA of the driven row 23 are attached with 7 langes 29 and 3o that are rotatable relative to the roller 3. The support frames 18 and 19 have a long length 1 in order to rotatably support the drive roller 1 at one end, and to make the shaft 3a, on which the driven roller 3 is fixedly fixed at the other end, movable in the direction of the roller 2 (in the direction of arrow 28).
It is rotatably supported via 8a and 19a. A metal fitting 22 serving as a sliding member is slidably attached to the support frames 18 and 19. This metal fitting 2
2 is rotatably attached to the shaft 3a at the end 22b,
Also, the bottle 21 installed in the frame 18 in the long section 221
It is mated with. Furthermore, a tension spring 23 is hung between the other end 22c of the metal fitting 22 and the pin 21. Therefore, the metal fitting 22 is moved to the direction indicated by the arrow 29 due to the tensile force of the spring 23.
The shaft 3 attached to this metal fitting 22 receives a force in the direction.
Push & in the direction of arrow 29, and also remove these metal fittings 22 and bottle 2.
1 and the tension spring 23tj and the support frame 19 are similarly provided. Therefore, the roller 3 fixed to the shaft 3a is also pushed in the direction of arrow 29, and is held by the support frames 18 and 19 with the belt 1 stretched across the length of 18 m and 19 m. A stay 24 is provided between the support frames 18 and 19 to reinforce the support frames 18 and 19 and to prevent the belt 1 from sagging.

Here, in this embodiment, the rollers 2 and 3 (their shafts 2a and 3m) supported by the support frames 18 and 19, the bell) 1, and the metal fittings 2
2. The stay 24 constitutes a photoreceptor belt unit (U). This unit (U) is integrally removable from the main body of the printer.

FIG. 2 shows a state in which the unit Ut is loaded into a predetermined loading position in the main body of the printer according to positioning means (not shown). In this state, one end of the shaft 2a is connected to the main body motor (not shown) via the clutch 2b.
It is connected to a drive system (not shown) such as a gear train that transmits the drive force of the drive.

Further, on the main body side, cams 26 and 27 are provided at positions facing the bent portion 22d at the end of the shaft 3a @I4 of the metal fitting 22. The cams 26 and 27r are fixed to a shaft 25 that is rotatable from 1 to 1. Further, this shaft 25 is connected to a drive system (not shown) via a clutch 25m so as to rotate at a predetermined timing. As the shaft 25 rotates, the arcuate portions 26m and 27m of the cams 26 and 27 come into contact with the bent portion 22d. With this, the metal fitting 22 is attached to the spring 2.
3 is pushed in the same direction as indicated by the arrow 31, and therefore the roller 3
The roller 3 also moves in the direction of arrow 31, and the roller 3 approaches the roller 2, and the distance between the rollers 2 and 3 decreases, causing the IFi to slacken. The amount to loosen this bell) 1 is -1 23 7 lunges 29
In this embodiment, the operation of the cams 26 and 27 is determined by the sensor 32 reading the black mark on the edge of the belt.
Clutch 25a is turned ON by a signal from sensor 32 immediately after the camera (Bell) 1 stops for exposure, and before exposure.
This is done by rotating the shaft 25 once.

Now, it is assumed that the photoreceptor belt 1 has moved toward the axial end of the roller as the photoreceptor belt 10 has traveled, and has come into contact with the seventh lunge 30 of the row 23 (FIG. 3). When the photoreceptor belt 1 is fed in order to perform the next copy in the state of being in a deep state,
The bell) 1 moves further toward the flange 30 and becomes in a raised state (Fig. 3 ■)). In such a state, if the belt 1 becomes slack due to the operation of the cams 26 and 27,
Belt 1 is now in a free state, and belt 1's 7 lunge 3
The portion that has come into contact with 0 and floated up is pushed back by the 7-lunge 30, and is pushed back at least to the state shown in FIG. 3 (4) or further to the center of μ-23. Note that even if the belt 1 is loosened when the belt is not meandering, no problem will occur because the belt 1 will be tensioned and supported at that position again.

In general, with a photoreceptor belt and rollers made with normal precision, the number of the photoreceptor belt changes from the state shown in FIG.
Since it will not be pushed toward the flange so much as to damage 1 (9), by loosening the photoconductor belt 1 for every 1 (9) copying operation, the situation shown in Figure 3 (a) can be repeated. become. Therefore, the photoreceptor belt can run without inverting the edges. However, a belt? The timing, interval (number of times), etc. of loosening can be appropriately selected depending on the meandering amount, etc., and are not limited to the present embodiment. Further, in this embodiment, only an example using a photoreceptor belt that is not very stretchable is shown, but the present invention is not limited to this, and can of course be applied to, for example, a stretchable rubber belt. be.

Hereinafter, favorable experimental results of the photoreceptor belt conveying device using the present example will be shown.

In the experiment, the direct C+ of the driving roller and driven roller was set to 50 [■
]・Width of both rollers is 400 [■], pelt width is 398~3
99〔■〕・7U/J protrusion height from the roller surface 5~
10 (■) - Installation interval between both rollers (distance between the centers of both coolers) 350 [■] Then, operate the cam every l copying stroke to loosen the belt about 5 places, and □ Correct the meandering of the belt. As a result, the belt did not fall off from both rollers or was damaged even after approximately 4,000 copies were made.The rollers were made of aluminum.

Still another embodiment is shown in FIG.

In this embodiment, the amount of slack in the belt is changed by changing the amount of eccentricity of the cam.

In the figure, 36 is a cam. Also 37Fi cam 11
A threaded part (male thread) 37 is located at a position facing the shaft 25 with a well-aligned axis.
A is cut □ and engages with a female thread (not shown) of the shaft 25. First, by loosening the set screw 33 and rotating the cam adjustment shaft 37, the cam 36 is displaced in the direction of arrow a or #'ib with respect to the shaft 25 along the elongated hole 36m. Therefore, when the cam 36tl is displaced in the direction a with respect to the shaft 25, the slackness of the belt l can be reduced, and when it is displaced in the direction b, the slackness t of the belt 1 can be increased. can be done. Therefore, in this embodiment, the slack of the belt 1 can be adjusted according to the meandering amount of the belt 1 or the stiffness of the belt 1. Note that after adjusting the E6 amount of the cam 36, the set screw 33 can be tightened again to prevent the cam adjustment shaft 37 from turning inadvertently. Further, 36b is a tension washer.

to Furthermore, FIG. 5 shows another embodiment.

This embodiment is an example in which seven flanges 34 and 35 are provided movably in the direction of the axis 3a of the roller 3.

That is, in the figure, 7 flange 34, 35 are movably provided along the axis 3a, and support frames 18, 19 and 7, respectively.
The bell is pressed in one direction by springs 29a and 30m provided between the lunges 34 and 35. Then, it is assumed that the photoreceptor belt (belt) 1 approaches the axial end of the roller from the jrc and comes into contact with the 7 langes 34 of the roller 3 (FIG. 4). In the current state, if you run Bell ) 1 to make the next copy, Be pw ) I
Fi, move further towards rank 34, spring (30a)
Go against the force and press 7 lunge 34 (Figure 4 (6))
. Here, when the belt l is loosened according to the above-mentioned fruiting example, the belt l returns to the predetermined position under the pushing force of the seven lunges 34,
Bell) 1 meandering can be corrected.

In particular, by using this embodiment, even when the amount of meandering of the belt is large, the meandering of the photoreceptor belt can be sufficiently corrected accordingly.

As described above, if the present invention is used, it is possible to provide a meandering correction device that can satisfactorily correct the meandering of not only stretchable belts but also belts that are not very stretchable.

[Brief explanation of the drawing]

FIG. 1 shows a printer to which an embodiment of the present invention can be applied.
(6) is also a side view of the flange portion of another embodiment. In the figure, 1... photoreceptor belt, 2... drive roller, 3...
Driven D=5.2*・3a...shaft, 18/19...support frame, 22-...metal fitting, 22d-...bending part, 23...
Spring, 25-・Shaft, 26・27・36...Cam, 29
・3゜・34・35...flange, 32...sensor, 33--set screw, 37...cam adjustment shaft, 37a
...Threaded part (male thread). Applicant Canon Co., Ltd. Kinoshita Research Institute Ltd.

Claims (2)

[Claims] (1) Rotating bodies provided to face each other to tension and support the endless belt; and a displacement means for displacing the rotating body in a direction to loosen the stretched and supported endless belt in order to correct the meandering of the endless belt. A meandering correction device for an endless belt, comprising: (2) The endless belt meandering correcting device according to claim (1), wherein the cocoon displacement means is driven by a cam. (81111) The endless belt meandering correction device according to claim (1), wherein the endless belt has a photoreceptor coated on its surface.