JPS6227209A - Meandering motion corrector for endless belt - Google Patents

Abstract

PURPOSE:To miniaturize a device in structure, by supporting both ends of a minimum one belt running roller with a correction setting member, and constituting both roller ends so as to be moved in the opposite direction by this member, in case of the above captioned device for an electronic copying machine or the like. CONSTITUTION:When a belt position detecting member detects a belt's deflection, a correction driving shaft 12 turns round. At this time, since eccentric parts 12a and 12b subjected to phase deviation in the opposite direction with each other are formed at both sides of this correction driving shaft 12, these eccentric parts perform each crank motion with rotational motion of the driving shaft, making a correction setting member 6 move in a direction contrary to each other with a pin 9 as a fulcrum. Therefore, both ends of a stretching roller 3, whose both ends are supported on the correction setting member 6, move in a direction contrary to each other, the the meandering motion in the belt is corrected. With this constitution, a tilting amount in the roller is reducible and its miniaturization is attainable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a meandering correction device for an endless belt that is movable by being wrapped around a plurality of rollers.

(Prior Art) An example of an endless belt is a photoreceptor belt used in an electronic copying machine.

As shown in FIG. 2, this photoreceptor belt 1 includes a belt base 1 made of a transparent film. AJ:, 20-60
% and a transparent organic semiconductor layer having a spectral transmittance (450 to 940 nm) of 20% or more, a so-called photosensitive layer, are sequentially laminated.

A transparent portion LD is formed on one edge of the photoreceptor belt 1 in the width direction as a synchronization mark for setting one image forming position, and the edge other than this portion is non-conductive with conductive paint. Translucent treatment has been applied.

The purpose of using this conductive paint is to allow the charge in the photoreceptor belt that is exposed to light to escape to the outside of the photoreceptor, and the conductive brush comes into contact with this conductive paint. ing.

As shown in FIG. 1, the photoreceptor belt 1 described above is wrapped around a plurality of guide drive rollers 2 or spreading rollers 3, and is movable in the direction of rotation of these rollers. During transportation, well-known copying operations are performed.

In FIG. 1, the reference numeral 4 indicates a backup roller that can come into contact with and separate from the back surface of the photoreceptor belt 1.
By pushing up the belt l, the gap between the surface of the belt l and the member performing the copying work is set so that the action of the member is most effective.

However, in such an endless belt that is wound around a plurality of rollers, there is a risk that the belt may shift in the axial direction of the rollers, resulting in so-called meandering, due to the assembly precision of the rollers.

Therefore, in order to solve this problem, an end plate is installed at the axial end of the roller on which the endless belt is hung, which is pushed and moved by the edge of the belt when it meanders, and this end plate can be used to detect meandering. A structure in which the roller is tilted in the axial direction based on the belt, or a structure in which both axial ends of the roller on which the belt is hung are displaced in a direction opposite to the direction in which the belt is stretched, for each copying cycle in which the belt rotates between the rollers. A structure has been proposed in which the belt is loosened over the entire axial direction of the roller.

However, in such a structure, the structure for correction is complicated, and it is necessary to ensure the strength of the edge of the belt.

If the parallelism of the rollers is poor, the corrective action will not be able to follow the meandering of the belt. In other words, if the amount of meandering that occurs during a copying cycle is large, the edge of the belt may be removed before the end of the copying cycle. New drawbacks have arisen, such as the risk of raising the end of the roller.

(Objective) The present invention has been made in view of the above, and an object of the present invention is to provide a meandering correction device for an endless belt that eliminates the above-mentioned drawbacks.

(Structure) The present invention includes a correction setting member that pivotally supports one of a plurality of rollers and is movable together with the roller in the direction in which tension is applied to the endless belt; A means for moving and biasing the endless belt in a direction to extend it, and a correction setting member that is normally in such a biased position, both axial ends of which are inserted and fitted, and the axial ends are set in relative phases. and an eccentric rotatable correction drive shaft, and by rotating the correction drive shaft, a crank movement is caused at the end of the drive shaft, and the correction drive shaft is pivotally supported by the correction setting member via the correction setting member. The feature is that the rollers are tilted alternately in the axial direction.

The present invention will be explained below with reference to one illustrated embodiment.

In FIG. 1, a spreading roller 3 and a guide roller 5 located close to the roller 3 are supported at both axial ends by a plate-shaped correction setting member 6, respectively.

The correction setting member 6 rotatably supports the above-mentioned spreading roller 3 and guide roller 5 on one end side in FIG. 1, that is, on the end side near the back surface of the photoreceptor belt 1.
A rod 7 is installed at the other end, that is, at the end opposite to the rollers 3 and 5 described above.

A long hole 6a is formed between one end side and the other end side of the correction setting member 6 along the displacement direction of the correction setting member 6 by a spring serving as a biasing means, which will be described later. , a pin 9 (see FIG. 4) fixed to the fuselage wall plate 8 is inserted.

This pin 9 and the rod 7 provided on the other end side of the correction setting member 6
A spring 10 serving as a biasing means is applied to the
As shown in FIG.
In FIG. 1, the displacement behavior in the direction shown by the arrow is given.

The above-mentioned rod 7 has an operating rod 11 of the tension release device 11.
One end of a is hooked, and this expansion release member 11 is
A support shaft 11 pivotally attached to the fuselage wall 8. A release lever 11c that can swing around b as a fulcrum, and a support shaft 1 of the release lever 11c.
1b and a pin lid installed in a spaced apart position and to which the other end of the operating rod 11a is latched, forms a toggle mechanism, and the release lever 11c is rotated counterclockwise in FIG. As a result, the correction setting member 6 is displaced in a direction in which the stretching roller 3 moves away from the back surface of the photoreceptor belt 1 against the bias of the spring 10, and the application of the stretching tension to the photoreceptor belt 1 is released. It has become.

In FIG. 4, another elongated hole 6b having the same longitudinal direction as the elongated hole 6a is bored between the rod 7 and the pin 9 in the correction setting member 6. An axial end portion of the correction drive shaft 12 is inserted through the hole 6b.

The modified drive shaft 12, as shown in FIGS. 5(B) and 5(C),
Both ends in the axial direction are eccentric shafts formed with eccentric parts], 2a, 12b which are out of phase with each other in the relative direction, and these eccentric parts 12a, 12b are connected to the fuselage wall plate as shown in FIG. 5(A). The sliding bracket 1 which is separate from the bearing 13 is inserted into the bearing 13 inserted into the hole drilled in the hole 8.
The correction setting member 6 is inserted into an elongated hole 14a in the correction setting member 6, and the distal end thereof is inserted into an elongated hole 6b of the correction setting member 6, and is rotatably supported by a bearing 15 in the elongated hole 6b.

The eccentric parts 12a and 12b of the correction drive shaft 12 are designed to perform a crank movement within the elongated hole 6b of the correction setting member 6 when the coaxial shaft 12 rotates. It abuts against the hole edge of the elongated hole 6b of the correction setting member 6, which is receiving the force.

The correction drive shaft 12 is provided with a member for controlling the rotation of the same shaft 12.

That is, as shown in FIG. 5(A) and FIG. 6, the correction drive shaft 12 has an orientation of approximately 180 degrees, and has a circumferential length that corresponds to the permissible meandering amount limit range of the position detection member 21, which will be described later. The set sector 16 is integrally supported, and this sector 1
Photoelectric elements 17 are arranged at the lower part of the fan side 6, facing each other across the fan side.

On the other hand, near the sector 16 on the corrected drive shaft 12,
2Y-m old army 18 is installed, and this worm gear 1
At 8, a worm oil 20 that is integrated with the rotating shaft of a motor M that is attached to a bracket 19 supported on the body wall plate 8 is engaged.

The motor M is designed to rotate in one direction when correcting the meandering of the photoreceptor belt 1, and the rotation timing of the motor M is determined by the position detection member 20 shown in FIG. 1 and the position detection member 20 shown in FIG. This is done by the detection signal of sector 16.

The above-mentioned position detection member 20 is arranged at the side edge of the belt 1 on the side corresponding to the transparent portion ID of the photoreceptor belt 1, as shown in FIG.

In the width direction of the photoreceptor belt 1, in other words, in the axial direction of the roller on which the belt 1 is hung, there are two sensors for detecting that the belt 1 is meandering beyond the permissible meandering limit position of the belt 1. Photoelectric elements 20a and 20b are arranged, and a synchronizing photoelectric element 20c for setting the running start time of the belt 1 is arranged inside these elements in the belt width direction.

In addition, FIG. 3(B) shows the BB arrow view of FIG. 3(A), and in order to arrange each photoelectric element in a small area,
The layout is shown at each vertex of a triangle.

The position detection member 20 has an edge in the width direction of the photoreceptor belt 1.
When detected by either the photoelectric element 20a or 20b, the motor M is energized.

The sector 16 on the correction drive shaft 12 side rotates in conjunction with the rotation of the motor M, and the rotation of the motor M is stopped at the timing of switching to block or transmit light from the photoelectric element 17. .

Therefore, when the position detecting member 20 detects that the edge of the belt 1 has shifted and the so-called meandering of the belt 1 has occurred, the motor M starts rotating and the potential level of the photoelectric element 17 is adjusted by the sector 16. The correction drive shaft 12 will rotate only until the change occurs.

When the correction drive shaft 12 rotates, the eccentric parts 12a and 12b of the coaxial shaft 12 perform a crank motion, and the eccentric part on the side that rotates away from the photoreceptor belt 1 has a length that abuts against each other. The correction setting member 6 with a hole is
The axial end of the stretching roller 3 on the corresponding side is tilted in a direction that weakens the application of stretching tension to the photoreceptor belt 1.

Incidentally, when the inventor of the present invention experimentally determined the amount of tilting in the axial direction of the roller supported by the correction setting member according to the above-mentioned embodiment, in FIG. When the difference is about 0.2 mm, the tilting amount a is about 0.2-0.3 mm, which makes it possible to cancel out the circumferential length difference that is the processing error mentioned above, and thereby, the parallelism of the roller can be obtained. It has been found that even if the parallelism is not the same, it can be corrected so that it is the same as when the stretching force applied to the belt is applied uniformly in the axial direction by matching the parallelism.

In addition, when it is desired to increase the amount of tilting, instead of inserting and supporting the shaft of the roller in the correction setting member 6 as in the above-mentioned embodiment, the same shaft is supported by a self-aligning bearing 10 as shown in FIG.
This is made possible by supporting the correction setting member 6 via 0.

In this embodiment, not only the spreading roller 3 but also the guide roller 5 are attached to the correction setting member 6.

The reason for tilting a pair of rollers in the axial direction is that when the rollers are close to each other, if only one roller is tilted, the belt that is in the meandering correction state on one row will move This is to prevent the tension of the belt from becoming uneven between the rollers, which is not the case with the row rows, and from causing waving.

(Effects) According to the present invention, when tilting the end of the stretching roller in the width direction of the photoreceptor belt, the correction setting member that pivotally supports the stretching roller F is adjusted at the moving speed of the photoreceptor belt. Regardless of this, it is possible to tilt the end of the stretching roller simply by displacing the axial ends alternately along the belt stretching direction using the crank movement when the correction drive shaft rotates. The advantage is that the displacement along the extension direction can be achieved with an extremely simple structure consisting of a sliding member and a member that performs a crank motion relative to this member, specifically a rotating shaft having an eccentric portion.

Furthermore, since belt meandering can be corrected while the photoreceptor belt is moving, it is not necessary to loosen the belt every time a copying cycle is completed.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view of essential parts showing an example of an endless belt used in the embodiment of the present invention,
FIG. 3(A) is a cross-sectional view showing an example of the position detection member used in the embodiment of the present invention, and FIG. 3(B) is B of FIG. 3(A).
-B arrow view; FIG. 4 is a schematic front sectional view of an embodiment of the present invention;
FIG. 5(A) is a perspective view of essential parts of an embodiment of the present invention, FIG. 5 CB
), (C) are views taken along arrows BB and CC in FIG. 5(A), FIG. The figure is a schematic diagram showing the operation of the embodiment of the present invention, and FIG. 8 is a schematic diagram showing a modification of the main part of the embodiment of the present invention. 1... Photoreceptor belt, 2, 5... Guide roller, 3... Expansion roller, 6... Correction setting member,
1o... Spring, 12... Correction drive shaft, +2a,
12b...Eccentric part. Engraving of drawings (no changes to 9) Engraving of Himetsuen drawings (no changes to contents) 6 Kasumi procedure amendments dated January 23, 1986

Claims (1)

[Claims] By tilting one of the plurality of rollers in its axial direction, the tension applied to the endless belt in the axial direction is changed, and the shifting of the endless belt is changed. In the meandering correction device for an endless belt to be corrected, at least one of the plurality of rollers is pivotally supported at both ends in the axial direction, and is provided separately from the wall plate of the device main body that supports the rollers other than this one. a correction setting member which is displaceable together with the pivotally supported roller along the direction in which tension is applied to the endless belt; and a correction setting member provided between the correction setting member and the wall plate;
Means for biasing the correction setting member so as to displace a roller, which is normally supported by the correction setting member, in a direction in which the endless belt is stretched; and a rotatable correction drive shaft whose axial ends are formed as eccentric shafts whose phases are shifted in the relative direction, and by rotating the correction drive shaft, the axial ends can be adjusted. The correction setting member whose end portion is inserted is displaced alternately at both ends in the axial direction along the direction in which tension is applied to the endless belt by cranking the correction setting member. A meandering correction device for an endless belt that alternately tilts one end of the roller in the axial direction with respect to the other end.