JPH10203674A - Belt meander adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize meander control of a belt, by effectively preventing a peripheral length change of the belt itself and a meander balance change at belt reciprocating time according to a kind of a conveyed medium on the belt. SOLUTION: A device has an alignment adjusting means 3 adjusting an alignment position of a steering roll 1s and a steering center shaft moving means 4 moving a mounting position of this alignment adjusting means 3 to move a center shaft of the steering roll 1s. Further, by a meander balance detection means 5 detecting meander balance at reciprocating time in a direction orthogonal to a moving direction of a belt 2, or based on a factor changing meander balance at reciprocating time in a direction orthogonal to a moving direction of the belt 2, meander balance at reciprocating time of the belt 2 is estimated in a meander balance estimation means 7, meander balance adjusting means 6, 8 are controlled, so as to almost equalize the meander balance at reciprocating time of the belt 2, the center shaft of the steering roll 1s is moved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveying device for circulating and conveying a belt, and more particularly to an improvement in a belt meandering adjusting device for adjusting a meandering (walk) in a direction perpendicular to a belt moving direction.

[0002]

2. Description of the Related Art Conventionally, as a belt transporting device of this type, for example, as a belt fixing device, there is a belt transporting device which is disposed in pressure contact with a heat fixing roll coated with an elastic body. This is done by arranging a plurality of support roll groups in parallel, wrapping an endless heat-resistant belt over these support roll groups, and circulating and conveying the belt, so that unfixed toner is fixed between the heat fixing roll and the belt. A sheet carrying an image is conveyed (Japanese Patent Laid-Open No. 5-150679).

In this type of belt transport device, from the viewpoint of effectively avoiding problems such as breakage of the belt edge, occurrence of wrinkling of the paper, and skew of the paper, the belt has a predetermined path. It is necessary to convey accurately, and it is an important technical problem to effectively prevent meandering in a direction (width direction) perpendicular to the moving direction of the belt. However, considering the imperfect formation of the belt and the support roll, the parallelism of the support roll group on which the belt is stretched, and the like, a belt meandering adjustment device that prevents meandering in the width direction of the belt has been conventionally used. Is provided.

In this type of belt meandering adjustment device, one of a group of rolls around which a belt is stretched is a tiltable steering roll, and an alignment adjustment device (for example, a steering motor and a link mechanism is used to rotate the steering motor. A device that adjusts the meandering of the belt by adjusting the alignment position of the steering roll using a device that moves the steering roll along a predetermined trajectory (Japanese Patent Application Laid-Open No. H05-205686) is already known. Fifteen
No. 0679).

[0005]

However, in this type of belt meandering adjusting device, if a situation occurs in which the circumferential length of the belt is different in the width direction, for example, during belt manufacturing or due to aging, The belt tends to approach one of the edges, and the meandering balance of the belt when reciprocating (the balance between the meandering time when going forward and the meandering time when returning) tends to be uneven. At this time, in some cases,
The belt is shifted in one direction beyond the meandering control range, and the belt collides with a guide or the like unnecessarily strongly, causing a technical problem that the belt is easily damaged.

Further, in a belt conveying device used in an image forming apparatus of a corner registration system (a system in which a corner portion of a platen is used as a positioning point), a belt is moved along a positioning line near one side in the width direction of the belt. The paper is moved and conveyed. At this time, when small-size paper or thick paper is used as the paper, the paper is strongly pressed against the belt at the nip portion between the heat fixing roll and the belt, so that the frictional resistance between the paper and the belt is increased. , And the belt tends to move closer to the paper passing portion. For this reason, similar to the change in the circumferential length in the width direction of the belt, there is a technical problem that the meandering balance of the belt during reciprocation is likely to be uneven, and the belt is likely to be damaged beyond the meandering control range.

The present invention has been made in order to solve the above technical problems, and has been made in consideration of a change in the circumference of the belt itself,
An object of the present invention is to provide a belt meandering adjustment device capable of effectively preventing a meandering balance change during belt reciprocation due to a type of a transport medium on a belt and stabilizing belt meandering control.

[0008]

That is, as shown in FIG. 1A, a belt meandering adjusting device according to the present invention comprises at least a tiltable steering roll 1s for meandering adjustment.
Are arranged in parallel with each other, and an endless belt 2 is wound around these roll groups 1 to adjust the alignment position of the steering roll 1s in a belt transport device that circulates and transports the belts 2. It is characterized by comprising an adjusting means 3 and a steering center axis moving means 4 for moving the mounting position of the alignment adjusting means 3 to move the center axis of the steering roll 1s.

As one mode for specifically operating the belt meandering adjusting device according to the present invention, as shown in FIG. 1B, in addition to the basic configuration shown in FIG. Meandering balance detecting means 5 for detecting the meandering balance at the time of reciprocation in a direction orthogonal to the moving direction of the moving object; What is necessary is just to provide the meandering balance adjustment means 6 which adjusts the steering center axis moving means 4 to move the center axis of the steering roll 1s so as to be balanced.

As another mode, as shown in FIG. 1B, in addition to the basic configuration shown in FIG. 1A, the meandering balance at the time of reciprocation in the direction orthogonal to the moving direction of the belt 2 is also shown. The meandering balance predicting means 7 for predicting the meandering balance of the belt 2 during reciprocation based on the fluctuating factor, and the meandering balance at reciprocation based on the meandering balance at reciprocation predicted by the meandering balance predicting means 7 is obtained. What is necessary is just to provide the meandering balance adjusting means 8 which adjusts the steering center axis moving means 4 to move the center axis of the steering roll 1s so as to be substantially balanced. Of course, both aspects can be simultaneously realized as one belt meandering adjustment device.

In such a technical means, as a belt transporting device to which the present invention is applied, if the belt transporting device includes a meandering adjustment steering roll 1s and circulates and transports the belt 2, it is used in an image forming apparatus or the like. The present invention widely includes a belt fixing device, a belt conveying device for conveying a conveying medium 9 such as paper, and the like.

The alignment adjusting means 3 includes:
As long as the alignment position of the steering roll 1s is adjusted, the steering roll 1s may be directly moved along a predetermined trajectory, or the rotational movement may be indirectly performed via a link mechanism or the like. It may be one that moves forward and backward. In this case, the movement trajectory of the alignment position of the steering roll 1s is not limited to the one disclosed in Japanese Patent Application Laid-Open No. 5-150679, and may be appropriately selected.

Further, the steering center axis moving means 4 may be appropriately selected as long as it moves the mounting position of the alignment adjusting means 3 and moves the center axis OC of the steering roll 1s.
Although the width of the alignment adjustment by the alignment adjusting means 3 is usually kept constant, the width of the alignment adjustment may be changed as necessary.

The meandering balance detecting means 5 includes:
Any sensor capable of detecting the meandering balance of the belt 2 during reciprocation may be used. For example, a sensor for detecting the meandering limit position of the belt 2 and a belt 2 based on a detection signal from the sensor.
Means for measuring meandering information (meaning time, meandering speed, meandering acceleration, etc.) at the time of going and returning, and meandering balance determining means for determining meandering balance during reciprocation of the belt 2 based on information from the measuring means. May be provided. Such detection timing of the meandering balance detecting means 5 may be arbitrarily selected, but a situation in which the meandering balance during the reciprocation of the belt 2 is easily broken is likely to occur in the process of transporting the transport medium 9 onto the belt 2. Therefore, it is preferable to operate the meandering balance detecting means 5 in the process of transporting the transport medium 9 onto the belt 2.

Further, the meandering balance predicting means 7 includes:
Focusing on the factors that affect the meandering balance when the belt 2 reciprocates, any factors may be appropriately selected as long as the degree of the effects due to the factors can be predicted in advance by an experiment or the like. For example, there is one that predicts the meandering balance of the belt 2 during reciprocation based on various types of information about the transport medium 9 on the belt 2. Here, various types of information on the transport medium 9 include the size (the size in the moving direction and / or the size in the width direction), the thickness, the surface frictional resistance, and the like of the transport medium 9 such as paper.
Refers to the skew state. As another example, there is a method of predicting the meandering balance of the belt 2 at the time of reciprocation based on a circumferential length difference of an end portion in a direction orthogonal to the moving direction of the belt 2. At this time, the difference in the circumference of the belt 2 may be directly detected, or the load of the steering roll 1s that changes according to the difference in the circumference of the belt 2 may be detected.

Next, the operation of the above technical means will be described. In FIG. 1B, when the meandering balance detecting means 5 detects the meandering balance during reciprocation in a direction orthogonal to the moving direction of the belt 2, the meandering balance adjusting means 6 performs the reciprocating movement detected by the meandering balance detecting means 5. Based on the meandering balance at the time, the steering center axis moving means 4 is adjusted so as to move the center axis of the steering roll 1s such that the meandering balance at the time of reciprocation is substantially balanced.

Now, for example, the meandering balance of the belt 2 during the reciprocation is out of the allowable range as shown on the left side of FIG. 2C (the right or left side of the vertical axis in FIG. Right and left). At this time, as shown in FIGS. 2A and 2B, the meandering balance adjusting means 6 determines the center axis (the meandering center of the steering roll 1s) of the steering roll 1s based on the detection information that the meandering balance of the belt 2 when reciprocating is lost. Axis) Move an appropriate amount of OC to the left side in the figure (OL position in the figure)
The alignment of the steering roll 1s is adjusted with a predetermined alignment width (shown by oblique lines in the figure) around the meandering center axis OL. In other words, the center axis OC of the steering roll 1s is moved in a direction in which the belt 2 is hard to return, and the alignment of the steering roll 1s is adjusted about the deviated meandering center axis OL. Then, the meandering balance of the belt 2 at the time of reciprocation returns to a substantially balanced state as shown on the right side of FIG. When the meandering balance of the belt 2 when reciprocating is lost in the opposite direction, the meandering balance adjusting means 6 moves the center axis (the meandering center axis) OC of the steering roll 1s to the right side in the figure (OR position in the figure). Move an appropriate amount to balance the meandering balance.

As shown in FIG. 1B, the meandering balance predicting means 7 calculates the meandering balance during the reciprocation of the belt 2 based on the factor of the meandering balance fluctuating in the direction orthogonal to the moving direction of the belt 2. Predict the meandering balance. Then, the meandering balance adjusting means 8 sets the steering roll 1s based on the meandering balance at the time of reciprocation predicted by the meandering balance predicting means 7 so that the meandering balance at the time of reciprocation is substantially balanced.
The steering center axis moving means 4 is adjusted to move the center axis of the steering wheel.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the accompanying drawings. First Embodiment FIG. 3 shows a first embodiment of a belt fixing device to which the present invention is applied. In FIG. 1, a belt fixing device includes a heating / fixing roll 20 having a built-in heater therein, and a sheet 4 carrying an unfixed toner image between the heating / fixing roll 20.
0 is provided with a belt conveying device 30 which is arranged in pressure contact. In the present embodiment, the belt transport device 30
For example, three support rolls 31 to 33 are arranged in parallel, and a belt 34 is attached to these support roll groups 31 to 33.
With a predetermined tension.
To 33 (in this embodiment, the support roll 3
3) is a tiltable steering roll. In the present embodiment, the paper 40 is particularly
As shown in the figure, a corner registration method (a method of positioning an original at the corner of the platen with a copying machine)
The belt 34 is moved and conveyed along a positioning line L near one end in the width direction orthogonal to the moving direction of the belt 34 determined by.

The alignment of the steering roll 33 is adjusted by an alignment adjusting device 50. The alignment adjusting device 50 according to the present embodiment is rotated in a predetermined direction as shown in FIGS. A movable steering motor 51; an eccentric cam 52 rotatably connected to the shaft of the steering motor 51 and having an eccentric locking portion 53 formed at a position eccentric to the shaft of the steering motor 51; A link mechanism 54 for restraining the eccentric locking portion 53 of the cam 52 and the rotation shaft supporting portion of the steering roll 33 is provided. In the present embodiment, the alignment adjusting mechanism makes the steering roll 33 meander to the leftmost side when the eccentric locking portion 53 is arranged closest to the steering roll 33 as shown by a solid line in FIG. As shown by, when the eccentric locking portion 53 rotates, for example, 90 degrees in the clockwise direction, the steering roll 33 is set to the reference position, and as shown by the dotted line in FIG. 90 degrees, the steering roll 3
3 meanders to the far right.

The alignment adjusting device 50 is supported by a steering center axis moving device 60. The steering center axis moving device 60 includes a steering motor 5
The worm gear 64 is attached to the shaft of the central shaft moving motor 63, and the worm gear 64 is engaged with the locking piece 62, and the central shaft moving motor 63 is By rotating the worm gear 64 in a predetermined direction (two forward and reverse directions), the mounting position of the steering motor 51 is moved forward and backward via the motor bracket 61. In the present embodiment, the steering center axis moving device 60
As shown by the solid line in FIG. 4, when the locking piece 62 is located at the intermediate position of the worm gear 64, the mounting position of the steering motor 51 is set such that the center axis position of the steering roll 33 is the reference position. When the locking piece 62 is located on the tip end side of the worm gear 64 as shown by the dashed line in FIG. 4, the steering motor 5 is moved so that the center axis position of the steering roll 33 is shifted to the left.
When the locking piece 62 is located on the base end side of the worm gear 64 as shown by a two-dot chain line in FIG. The setting position of the steering motor 51 is set in the following.

FIG. 5 shows a belt meandering control system of the fixing belt unit according to the present embodiment. In the figure,
Reference numeral 70 denotes a control device including a microcomputer including a CPU, a ROM, a RAM, and an I / O port. The control device 70 includes an end portion in a direction (width direction) orthogonal to the moving direction of the belt 34. Signals from a pair of meandering limit detection sensors 71 and 72 for detecting the meandering limit position, a sheet size sensor 73, and a thick paper mode selection switch 74 are input. Here, as the meandering limit detection sensors 71 and 72, the optical path is blocked in accordance with a mechanical sensor such as a microswitch to which the widthwise end of the meandering belt 34 contacts, or the meandering of the widthwise end of the belt 34. An optical sensor for detecting the fact is used. The paper size sensor 73 is a sensor that indicates whether the length and width dimensions of the paper 40 are larger, smaller, or equal to the reference size, and is provided, for example, in the paper transport path. Further, the thick paper mode selection switch 74 is a switch for designating that the paper 40 to be used is thick paper, and is selected by an operator himself / herself on a console panel, for example. The control device 70
For example, a belt meandering control program as shown in FIG. 6 is stored in advance in the ROM, and the control device 70 executes the belt meandering control program and controls the steering motor 51 and the center axis moving motor 63 to a predetermined value. Is transmitted. In FIG. 6,
T0 is the mean value of the meandering time, T1 is the meandering time from the left to the right in the moving direction of the belt 34, T2 is the meandering time from the right to the left in the moving direction of the belt 34, F1 is the number of times the T1 has exceeded the time, F2
Is the number of times exceeding T2 time, S1 and S2 are meandering limit detection sensors 7
1 and 72 are shown.

Next, an operation example of the belt meandering control system according to this embodiment will be described. Now, when a copy start switch (not shown) is turned on, the control device 70 appropriately rotates the steering motor 51 according to a change in the statuses S1 and S2 of the meandering limit detection sensors 71 and 72 to perform normal alignment adjustment. The movement control of the center axis of the steering roll 33 is performed as described above.

That is, after confirming the current status (S1, S2) of the meandering limit detection sensors 71, 72, the control device 70 checks whether or not the number of continuous prints is 10 or more. Here, if the continuous print number of the belt 34 is less than 10, the control device 70
It is determined that the size of the paper 40 does not significantly affect the meandering of No. 4, and the meandering balance of the belt 34 is immediately detected, and the meandering adjustment of the belt 34 is performed based on the detection result.
On the other hand, when the number of continuous prints is 10 or more, it is determined that the size of the sheet 40 greatly affects the meandering of the belt 34, and the meandering balance of the belt 34 is first estimated from the size of the sheet 40. After the meandering adjustment of the belt 34 is performed based on the prediction, the actual meandering balance of the belt 34 is detected, and the meandering adjustment of the belt 34 is performed based on the detection result.

First, the predicted meandering adjustment by the control device 70 based on the paper size and the like will be described.
Is F under the condition that the number of continuous prints is 10 or more.
After initializing 1, F2, T1, and T2, the steering center axis moving device 60 is controlled in accordance with the paper size matrix to control the movement of the center axis of the steering roll 33. In the present embodiment, for example, as shown in FIG. 8, the paper size matrix has a length dimension (dimension in the moving direction of the paper 40) and a width dimension (dimension orthogonal to the moving direction of the paper 40) as a reference dimension. (In this embodiment, A4
The amount of movement of the central axis of the steering roll 33 is determined according to the parameter of whether the length is equal to, less than, or greater than this, and the type of the paper 40 (thick paper or normal). I have. FIG.
, Each numerical value (%) indicates a ratio when the normal meandering range of the belt 34 is set to 100%. Thereafter, the control device 70 determines that F1 ≧ 1 and F2 ≧
1, it is determined whether or not T1 or T2 ≦ T0. If these conditions do not match, a subroutine (abnormality processing) shown in FIG. 7A is executed. To the step of detecting the actual meandering balance.

Next, the meandering adjustment by the meandering balance detection by the control device 70 will be described as follows. That is, the controller 70 controls the meandering limit detection sensor 7
The timer is operated according to the change timing of the statuses S1 and S2 of 1, 72, and the meandering time (T1, T2) is set to a predetermined number of times (in this embodiment, N = 4 times: T1 and T2 are twice each).
Sampling, averaging based on it,
It is determined whether or not T1 (Ave) = T2 (Ave). Where T
If 1 (Ave) = T2 (Ave), T0 = T1 (Ave), T1
= T2 = 0, then F1 ≧ 1 and F2 ≧ 1, T1or
The process returns to the step of determining whether T2 ≦ T0.

On the other hand, T1 (Ave) ≠ T2 (Ave), for example, T
If 1> T2, the subroutine shown in FIG. 7B is executed after setting F1 = F1 + 1, and if T2> T1, the subroutine is executed after setting F2 = F2 + 1. In the subroutine, if F1 or F2> 2, the same abnormal processing as in the subroutine is executed, and F1o
If rF2 ≦ 2, the statuses (S1, S2) of the meandering limit detection sensors 71, 72 are checked, and then the T shown in FIG.
1. The steering center axis moving device 60 is controlled based on the center axis movement amount based on the time difference of T2 to control the movement of the center axis of the steering roll 33. Note that the table shown in FIG. 9 is a table in which the relationship between the time difference between T1 and T2 and the amount of movement of the center axis of the steering roll 33 is obtained in advance by experiments.

As described above, when the deviation speed of the belt 34 is imbalanced (when the meandering balance is lost), the meandering center position of the steering roll 33 is changed by controlling the steering center axis moving device 60. , It is possible to substantially balance the shift speed of the belt 34. At this time, the meandering range of the steering roll 33 associated with the rotation of the steering motor 51 is constant regardless of the position of the center axis moving motor 63.

Further, in this embodiment, as shown in FIG. 10, when the paper 40 does not pass over the belt 34, the belt 34 meanders from right to left in the width direction (left to right). Although there is almost no difference in the meandering time to (), when the paper 40 passes (at the time of paper passing), a difference occurs in the meandering time in the meandering direction due to friction with the paper 40. Under such circumstances, in the present embodiment, the belt 34
The above-described belt meandering control operation is executed when the paper is easily passed through the meandering balance.

Second Embodiment FIG. 11 shows a second embodiment of a belt fixing device to which the present invention is applied. In the figure, the basic configuration of the belt fixing device is substantially the same as that of the first embodiment, but a belt meandering adjustment device 80 for the steering roll 33 used in the belt transport device 30 is different from the first embodiment. In the present embodiment, as shown in FIGS. 11 and 12, the belt meandering adjusting device 80 has a pair of sun gears 85 and 86 (internal gears) fixedly opposed to each other on a support bracket 89, and each sun gear 85 and 86 are engaged with three planetary gears 87 that are mutually restrained by a carrier 88, and the corresponding one planetary gear 87 of the pair of sun gears 85 and 86 is driven by a driving motor 81 via a one-way gear (not shown). An eccentric cam 82 having an eccentric locking portion 83 formed at a position eccentric from the rotary shaft at one end of the rotary shaft of the drive motor 81 is connected to a one-way gear (not shown) (not shown). (In the direction opposite to the one-way gear provided between them), and connects the eccentric locking portion 83 of the eccentric cam 82 and the rotating shaft support portion of the steering roll 33 to a link machine. 84 is obtained so as to connected with.

Therefore, according to the present embodiment, FIG.
As shown in (a), when the drive motor 81 is rotated in the direction of arrow A, the rotation shaft of the drive motor 81 and the eccentric cam 82 are connected to rotate the eccentric cam 82, and adjust the alignment position of the steering roll 33. I do. At this time, since the rotating shaft of the drive motor 81 and the planetary gears 87 are idle through the one-way gear, the planetary gears 87 do not planetary move around the sun gears 85 and 86.

On the other hand, as shown in FIG. 13B, when the drive motor 81 is rotated in the direction of arrow B (the direction opposite to the direction of arrow A), the rotating shaft of the drive motor 81 and the planetary gear 87 are rotated.
And the planetary gears 87 rotate around the sun gears 85 and 86 in the direction of arrow C, and the mounting position of the drive motor 81 moves along the movement locus of the planetary gears 87 and the center of the steering roll 33. The axis moves. At this time, since the rotating shaft of the drive motor 81 and the eccentric cam 82 are idle through the one-way gear, the eccentric cam 82 does not rotate.

As described above, in the present embodiment, the ordinary meandering control of the steering roll 33 or the movement control of the center axis of the steering roll 33 is performed by changing the rotation direction of the drive motor 81.

Third Embodiment FIG. 14 is an explanatory diagram showing a main part of a belt fixing device according to a third embodiment of the present invention. In the figure, the basic configuration of the belt conveyance device is substantially the same as that of the first embodiment, but a method of estimating the meandering balance of the belt 34 is changed to a method different from that of the first embodiment. That is, in the present embodiment, both ends of the steering roll 33 of the belt transport device 30 are supported by the load measuring devices 91 and 92, and for example, the load balance when the circumferential length of both ends in the width direction of the belt 34 changes due to aging or the like. Is measured, and the central axis of the steering roll 33 is moved based on the measured load difference so as to make the meandering balance of the belt 34 reciprocating substantially equilibrium. Here, the steering roll 3
The relationship between the movement amount of the center axis 3 and the measured load difference may be determined in advance by experiments or the like.

[0035]

As described above, according to the present invention,
By moving the mounting position of the alignment adjustment means and moving the center axis of the steering roll, when the meandering balance of the belt is lost, by moving the center axis of the steering roll in the direction in which the belt is difficult to return, the belt Meandering balance can be easily adjusted to a balanced state. For this reason, it is possible to effectively prevent a change in the circumference of the belt itself and a change in the meandering balance during the reciprocation of the belt due to the type of the transport medium on the belt, and to stabilize the meandering control of the belt.

In particular, in the present invention, the meandering balance of the belt is detected, and based on the detection result, the center axis of the steering roll is moved so that the meandering balance of the belt is substantially balanced. The meandering adjustment of the belt can be performed while the balance is constantly monitored, and accordingly, a situation in which the belt is broken beyond the meandering control range can be reliably avoided.

Further, in the present invention, the meandering balance of the belt is predicted from the main meandering factors of the belt (the difference in the circumference of the belt, the type of the transport medium, etc.), and based on the prediction result,
By moving the central axis of the steering roll so that the meandering balance of the belt is substantially balanced, it is possible to predict in advance the meandering balance of the belt meandering, and to effectively prevent the meandering balance of the belt in advance. By doing so, the meandering control of the belt can be stably performed.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views showing an outline of a belt meandering adjusting device according to the present invention.

2A is an explanatory diagram showing an example of the behavior of the steering roll of the belt meandering adjustment device according to the present invention, FIG. 2B is an explanatory diagram showing the meandering range of each steering roll,
(C) is an explanatory view showing an operation of the belt meandering adjustment device according to the present invention.

FIG. 3 is an explanatory diagram illustrating Embodiment 1 of the belt fixing device to which the present invention has been applied.

FIG. 4 is an explanatory diagram illustrating a basic configuration of a belt meandering adjustment device used in the first embodiment.

FIG. 5 is an explanatory diagram showing a control system of the belt meandering adjustment device used in the first embodiment.

FIG. 6 is an explanatory diagram showing a flowchart of belt meandering control used in the first embodiment.

7A and 7B are explanatory diagrams showing a subroutine (SUB, SUB) of the flowchart in FIG.

FIG. 8 is an explanatory diagram showing a center axis matrix according to a paper type used in the first embodiment.

FIG. 9 shows T used in the subroutine of FIG. 7 (b).
FIG. 1 is a graph for determining a center axis movement amount based on a time difference of T2.

FIG. 10 is an explanatory diagram showing a difference in meandering time depending on presence / absence of paper passing in the first embodiment.

FIG. 11 is an explanatory diagram showing Embodiment 2 of the belt fixing device to which the present invention has been applied.

FIG. 12 is an explanatory plan view of a belt meandering adjusting device used in the second embodiment.

FIG. 13A is an explanatory diagram illustrating a normal alignment adjustment of the belt meandering adjustment device according to the second embodiment, and FIG.
FIG. 4 is an explanatory diagram showing adjustment of a center axis movement of a steering roll.

FIG. 14 is an explanatory diagram showing a main part of a belt fixing device according to a third embodiment of the present invention;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Roll group, 1s ... Steering roll, 2 ... Belt, 3 ... Alignment adjustment means, 4 ... Steering center axis moving means, 5 ... Meandering balance detection means, 6, 8 ... Meandering balance adjustment means, 7 ... Meandering balance prediction means , 9 ... Conveying medium

Claims (7)

[Claims] A plurality of roll groups (1) including at least a tiltable steering roll (1s) for meandering adjustment are arranged in parallel, and these roll groups (1) are arranged.
An endless belt (2), and a belt transport device for circulating and transporting the belt (2). An alignment adjusting means (3) for adjusting an alignment position of the steering roll (1s); A) a steering center axis moving means (4) for moving the center axis of the steering roll (1s) by moving the mounting position of (1). 2. A plurality of roll groups (1) including at least a tiltable steering roll (1s) for meandering adjustment are arranged in parallel, and these roll groups (1) are arranged.
An endless belt (2), and a belt transport device for circulating and transporting the belt (2). An alignment adjusting means (3) for adjusting an alignment position of the steering roll (1s); ), A steering center axis moving means (4) for moving the center axis of the steering roll (1s), and meandering for detecting meandering balance during reciprocation in a direction orthogonal to the moving direction of the belt (2). Based on the balance detecting means (5) and the meandering balance at the time of reciprocation detected by the meandering balance detecting means (5), the center axis of the steering roll (1s) is adjusted so that the meandering balance at the time of reciprocation is substantially balanced. A meandering balance adjusting means (6) for adjusting a steering center axis moving means (4) to move the belt; Meandering adjustment device. 3. A plurality of roll groups (1) including at least a tiltable steering roll (1s) for meandering adjustment are arranged in parallel, and these roll groups (1) are arranged.
An endless belt (2), and a belt transport device for circulating and transporting the belt (2). An alignment adjusting means (3) for adjusting an alignment position of the steering roll (1s); And (4) a means for moving the center axis of the steering roll (1s) by moving the mounting position of (1), and a factor that varies meandering balance during reciprocation in a direction orthogonal to the moving direction of the belt (2). Meandering balance predictor (7) for predicting the meandering balance of the belt (2) during reciprocation based on the meandering distance. Based on the meandering balance during reciprocation predicted by the meandering balance predictor (7), The steering center axis moving means (4) is adjusted to move the center axis of the steering roll (1s) so that the meandering balance is substantially balanced. A belt meandering adjusting device comprising a meandering balance adjusting means (8). 4. The meandering balance detecting means (5) according to claim 2, wherein the meandering balance detecting means (5) detects a meandering limit position of the belt (2), and detects the meandering position of the belt (2) based on a detection signal from the sensor. A belt comprising: measuring means for measuring meandering information during forward and backward movements; and meandering balance determining means for determining meandering balance of the belt (2) during reciprocation based on information from the measuring means. Meandering adjustment device. 5. The meandering belt according to claim 4, wherein the meandering balance detecting means (5) operates in a process of conveying the conveying medium (9) onto the belt (2). Adjustment device. 6. The meandering balance predicting means (7) calculates a meandering balance of the belt (2) during reciprocation based on various kinds of information on a transport medium (9) on the belt (2). A belt meandering adjustment device, which is to be predicted. 7. The meandering balance predicting means (7) according to claim 3, wherein the meandering balance predicting means (7) determines whether the belt (2) reciprocates at the time of reciprocation based on a circumferential length difference between ends of the belt (2) in a direction perpendicular to the moving direction. A belt meandering adjusting device for predicting meandering balance.