JP3758785B2 - Belt meander adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt conveying device that circulates and conveys a belt, and more particularly, to an improvement in a belt meandering adjusting device that adjusts a meandering (walk) in a direction orthogonal to a moving direction of a belt.
[0002]
[Prior art]
Conventionally, as an example of this type of belt conveying device, for example, a belt fixing device, there is one that is disposed in pressure contact with a heat fixing roll coated with an elastic body.
This is because a plurality of support roll groups are arranged in parallel, an endless heat-resistant belt is stretched over these support roll groups, and the belt is circulated and conveyed, whereby unfixed toner is provided between the heat fixing roll and the belt. A sheet carrying an image is conveyed (Japanese Patent Laid-Open No. 5-150679).
[0003]
In this type of belt conveyance device, the belt accurately conveys a predetermined route from the viewpoint of effectively avoiding problems such as breakage of the belt end, generation of paper wrinkles, and paper skew. Therefore, it is an important technical problem to effectively prevent meandering in the direction (width direction) perpendicular to the moving direction of the belt.
However, in consideration of incomplete molding of the belt and the support roll, parallelism of the support roll group on which the belt is stretched, and the like, conventionally, a belt meandering adjustment device that prevents meandering in the width direction of the belt has been provided. Is provided.
[0004]
In this type of belt meandering adjustment device, one of a group of rolls on which the 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 steer as the steering motor rotates). A device that adjusts the meandering of the belt by adjusting the alignment position of the steering roll with a device that moves the roll along a predetermined locus is already known (Japanese Patent Laid-Open No. 5-150679). ).
[0005]
[Problems to be solved by the invention]
However, in this type of belt meandering adjustment device, for example, if a situation occurs in which the circumference of the belt differs in the width direction at the time of manufacturing the belt or due to a change with time, the belt is attached to one of the edges. As a result, the meandering balance during the reciprocation of the belt (the balance between the meandering time at the time of going forward and the meandering time at the time of return) tends to become uneven.
At this time, depending on the case, the belt may be offset in one direction beyond the meandering control range, causing the technical problem that the belt collides with the guide or the like unnecessarily strongly and is easily damaged.
[0006]
Also, in belt conveyors used in corner registration system (a system that uses the corners of the platen as positioning points), etc., the paper moves along a positioning line near one side in the belt width direction. Will be transported.
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. Becomes larger, and accordingly, the belt tends to be closer to the paper passing portion.
For this reason, like the change in the circumferential length in the width direction of the belt, the meandering balance during the reciprocation of the belt is likely to be non-uniform, causing a technical problem that the belt is easily damaged beyond the meandering control range.
[0007]
The present invention has been made in order to solve the above technical problem, and effectively prevents changes in the circumference of the belt itself and changes in meandering balance during belt reciprocation associated with the type of transport medium on the belt. The present invention provides a belt meandering adjustment device capable of stabilizing belt meandering control.
[0008]
[Means for Solving the Problems]
  That is, as shown in FIG. 1A, the belt meandering adjustment apparatus according to the present invention arranges a plurality of roll groups 1 including at least tiltable steering rolls 1s for meandering adjustment in parallel, and these rolls. In a belt conveyance device that circulates an endless belt 2 over the group 1 and circulates and conveys the belt 2,The meandering balance when the belt 2 reciprocates is substantially balanced.A meandering center axis moving means 4 for moving the meandering center axis of the steering roll 1s and an alignment adjusting means 3 for adjusting the steering roll 1s with a predetermined alignment width around the meandering center axis are provided. It is.
[0009]
  Further, 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. Based on the meandering balance detection means 5 for detecting the meandering balance at the time of reciprocation in the direction orthogonal to the meandering and the meandering balance at the time of reciprocation detected by the meandering balance detection means 5, the meandering balance at the time of reciprocation is substantially balanced. To move the central axis of the steering roll 1sMeanderA meandering balance adjusting means 6 for adjusting the central axis moving means 4 may be provided.
[0010]
  As another aspect, as shown in FIG. 1 (b), in addition to the basic configuration shown in FIG. 1 (a), a factor that fluctuates the meandering balance during reciprocation in the direction perpendicular to the moving direction of the belt 2. The meandering balance predicting means 7 for predicting the meandering balance at the time of reciprocation of the belt 2 and the meandering balance at the time of reciprocation that is predicted by the meandering balance predicting means 7 are substantially balanced. To move the central axis of the steering roll 1sMeanderThe meandering balance adjusting means 8 for adjusting the central axis moving means 4 may be provided.
  Of course, both modes can be realized simultaneously as one belt meandering adjustment device.
[0011]
In such technical means, the belt conveying device to which the present application is applied includes a belt fixing used in an image forming apparatus or the like as long as it includes a steering roll 1s for meandering adjustment and circulates and conveys the belt 2. The apparatus widely includes a belt conveyance device for conveying a conveyance medium 9 such as a sheet.
[0012]
Further, as the alignment adjusting means 3, as long as the alignment position of the steering roll 1s is adjusted, the steering roll 1s may be moved directly along a predetermined trajectory, or may be rotated. May be indirectly advanced or retracted via a link mechanism or the like.
In this case, the movement trajectory of the alignment position of the steering roll 1s is not limited to that shown in Japanese Patent Laid-Open No. 5-150679, and can be selected as appropriate.
[0013]
  Furthermore,MeanderFor the center axis moving means 4, the mounting position of the alignment adjusting means 3 is moved, and the center axis of the steering roll 1s is moved.(Meandering central axis)If OC (see FIG. 2 (a)) is moved, it may be selected as appropriate. At this time, the alignment adjustment width by the alignment adjusting means 3 is usually kept constant, but if necessary, alignment is performed. The adjustment range may be changed.
[0014]
The meandering balance detection means 5 may be any means that can detect the meandering balance when the belt 2 reciprocates. For example, a sensor that detects the meandering limit position of the belt 2 and a detection signal from the sensor. Measuring means for measuring meandering information (meandering time, meandering speed, meandering acceleration, etc.) when the belt 2 goes back and forth, and meandering balance for determining the meandering balance when the belt 2 reciprocates based on information from the measuring means. What is necessary is just to provide a determination means.
The detection timing of the meandering balance detection means 5 can be arbitrarily selected, but the situation where the meandering balance during the reciprocation of the belt 2 is likely to be lost tends to occur in the process of conveying the conveying medium 9 onto the belt 2. Therefore, it is preferable to operate the meandering balance detection means 5 in the process of transporting the transport medium 9 onto the belt 2.
[0015]
Further, the meandering balance predicting means 7 is appropriately selected as long as it can be predicted by investigating the degree of influence by this factor in advance by paying attention to factors affecting the disruption of the meandering balance when the belt 2 reciprocates. There is no problem.
For example, what predicts the meandering balance at the time of reciprocation of the belt 2 based on various kinds of information on the conveyance medium 9 on the belt 2 is mentioned.
Here, the various types of information related to the transport medium 9 refers to the size (movement direction size and / or width direction size), thickness, surface frictional resistance, skew state, and the like of the transport medium 9 such as paper.
Another example is one that predicts the meandering balance during the reciprocation of the belt 2 based on the circumferential length difference of the direction end perpendicular to the moving direction of the belt 2.
At this time, the circumferential length difference of the belt 2 may be directly detected, or the steering roll 1s load that varies with the circumferential length difference of the belt 2 may be detected.
[0016]
  Next, the operation of the technical means described above will be described.
  In FIG. 1B, when the meandering balance detecting means 5 detects the meandering balance at the time of reciprocation in the direction orthogonal to the moving direction of the belt 2, the meandering balance adjusting means 6 detects the reciprocation detected by the meandering balance detecting means 5. Based on the meander balance at the time, the center axis of the steering roll 1s should be moved so that the meander balance at the time of reciprocation is substantially balanced.MeanderThe center axis moving means 4 is adjusted.
[0017]
  Now, for example, the meandering balance during reciprocation of the belt 2 has collapsed beyond the allowable range as shown on the left side of FIG. 2C (the right or left of the vertical axis in the figure is the right side with respect to the moving direction of the belt 2, Assume left).
  At this time, as shown in FIGS. 2A and 2B, the meandering balance adjusting means 6 determines the center axis (meandering center) of the steering roll 1s based on the detection information that the meandering balance during the reciprocation of the belt 2 is lost. Axis) Move OC to the left side (OL position in the figure) by an appropriate amountNewThe steering roll 1s is aligned with a predetermined alignment width (indicated by the slanted line in the figure) around the meandering center axis OL. In other words, the central axis of the steering roll 1s in a direction in which the belt 2 is difficult to return.(Meandering central axis)OC is moved, and the steering roll 1s is aligned with the displaced meandering center axis OL as the center.
  Then, the meandering balance during the reciprocation of the belt 2 returns to a substantially balanced state as shown on the right side of FIG.
  When the meandering balance during reciprocation of the belt 2 is reversed in the reverse direction, the meandering balance adjusting means 6 moves the central axis (meandering central axis) OC of the steering roll 1s to the right side (OR position in the figure). Move the proper amount to balance the meandering balance.
[0018]
  Further, as shown in FIG. 1B, the meandering balance predicting means 7 determines the meandering balance when the belt 2 reciprocates based on the factors that cause fluctuations in the meandering balance when reciprocating in the direction orthogonal to the moving direction of the belt 2. Predict.
  Then, the meandering balance adjusting means 8 moves the central axis of the steering roll 1s based on the meandering balance at the time of reciprocation predicted by the meandering balance prediction means 7 so that the meandering balance at the time of reciprocation is substantially balanced.MeanderThe center axis moving means 4 is adjusted.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
Embodiment 1
FIG. 3 shows a first embodiment of a belt fixing device to which the present invention is applied.
In the figure, a belt fixing device includes a heat fixing roll 20 having a heater built therein, and a belt conveying device 30 in which a sheet 40 carrying an unfixed toner image is pressed against the heat fixing roll 20. It is equipped with.
In the present embodiment, the belt conveyance device 30 has, for example, three support rolls 31 to 33 arranged in parallel, and the belt 34 is wound around these support roll groups 31 to 33 with a predetermined tension. One of the support rolls 31 to 33 (in this embodiment, the support roll 33) is a tiltable steering roll.
In this embodiment, as shown in FIG. 5, the sheet 40 has a width orthogonal to the moving direction of the belt 34 determined by a corner registration method (a method of positioning a document at a corner of a platen by a copying apparatus). It is moved and conveyed along a positioning line L near one end in the direction.
[0020]
  The steering roll 33 is adjusted by the alignment adjusting device 50, and the alignment adjusting device 50 according to the present embodiment is rotatable in a predetermined direction as shown in FIGS. A steering motor 51, an eccentric cam 52 that is rotatably connected to the shaft of the steering motor 51 and has an eccentric locking portion 53 formed at a portion that is eccentric with respect to the shaft of the steering motor 51, and the eccentric cam 52 A link mechanism 54 that restrains the eccentric locking portion 53 and the rotation shaft support portion of the steering roll 33 is provided.
  In the present embodiment, the alignment adjustment mechanism is configured so that the steering roll 33 is positioned when the eccentric locking portion 53 is disposed closest to the steering roll 33, as indicated by a solid line in FIG.TheWhen the eccentric locking portion 53 rotates 90 degrees clockwise, for example, as shown by a thin line in FIG. 4, the steering roll 33 is set to the reference position, and as shown by the dotted line in FIG. When the eccentric locking portion 53 further rotates 90 degrees in the clockwise direction, the steering roll 33 is meandered to the rightmost side.
[0021]
  The alignment adjustment device 50 isThe central axis (meandering central axis) of the steering roll 33 is moved.The steering center shaft moving device 60 is supported.
  The steering center shaft moving device 60 is provided with a locking piece 62 on a motor bracket 61 to which the steering motor 51 is fixed, and a worm gear 64 is attached to the shaft of the center shaft moving motor 63, and the locking piece is attached to the worm gear 64. 62 is engaged, and the center shaft moving motor 63 rotates the worm gear 64 in a predetermined direction (forward and reverse two directions) to move the mounting position of the steering motor 51 forward and backward through the motor bracket 61.
  In the present embodiment, as shown by a solid line in FIG. 4, the steering center axis moving device 60 is configured such that the center axis position of the steering roll 33 is the reference position when the locking piece 62 is positioned at the intermediate position of the worm gear 64. When the attachment position of the steering motor 51 is set so that the locking piece 62 is positioned on the tip side of the worm gear 64 as shown by a one-dot chain line in FIG. The mounting position of the steering motor 51 is set so as to be in the position, and when the locking piece 62 is positioned on the proximal end side of the worm gear 64 as shown by a two-dot chain line in FIG. The mounting position of the steering motor 51 is set so that the position becomes the right side position.
[0022]
FIG. 5 shows a belt meandering control system of the fixing belt unit according to this embodiment.
In the figure, reference numeral 70 denotes a control device comprising a microcomputer composed of a CPU, ROM, RAM and I / O port. The control device 70 has 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, a paper size sensor 73, and a thick paper mode selection switch 74 for detecting the meandering limit position of the end are input.
Here, as the meandering limit detection sensors 71 and 72, the optical path is interrupted according to a mechanical sensor such as a micro switch with which the end portion in the width direction of the meandering belt 34 abuts or the meandering of the end portion in the width direction of the belt 34. An optical sensor for detecting this 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 a thick paper, and is selected by the operator's own operation on the console panel, for example.
Further, for example, a belt meandering control program as shown in FIG. 6 is stored in the ROM of the control device 70. The control device 70 executes the belt meandering control program, and the steering motor 51 and the central axis moving motor. A predetermined control signal is sent to 63.
In FIG. 6, T0 is the meandering time average value, T1 is the meandering time from the left side to the right side in the moving direction of the belt 34, T2 is the meandering time from the right side to the left side in the moving direction of the belt 34, and F1 is the number of times exceeding the T1 time. F2 indicates the number of times that the T2 time is exceeded, and S1 and S2 indicate the status of the meandering limit detection sensors 71 and 72, respectively.
[0023]
Next, an operation example of the belt meandering control system according to the present embodiment will be described.
Now, when a copy start switch (not shown) is turned on, the control device 70 rotates the steering motor 51 appropriately according to changes 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 as described below is performed.
[0024]
That is, after confirming the current statuses (S1, S2) of the meandering limit detection sensors 71, 72, the control device 70 checks whether the number of continuous prints is 10 or more.
Here, when the number of continuous prints of the belt 34 is less than 10, the control device 70 determines that the size of the paper 40 does not significantly affect the meandering of the belt 34 and immediately detects the meandering balance of the belt 34. Then, 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 paper 40 greatly affects the meandering of the belt 34. First, the meandering balance of the belt 34 is predicted from the size of the paper 40 and the like. Then, after the meandering adjustment of the belt 34 is performed based on this 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.
[0025]
First, the meandering adjustment based on the paper size by the control device 70 will be described. The control device 70 initializes F1, F2, T1, and T2 under the condition that the number of continuous prints is 10 or more. The steering center axis moving device 60 is controlled according to the size matrix, and the movement control of the center axis of the steering roll 33 is performed.
In the present embodiment, for example, as shown in FIG. 8, the sheet size matrix has a length dimension (a dimension in the movement direction of the sheet 40) and a width dimension (a dimension orthogonal to the movement direction of the sheet 40) as reference dimensions. (A4 length in the present embodiment) is equal to, less than, or more than this, and the amount of movement of the central axis of the steering roll 33 depending on the type of paper 40 (whether thick paper or normal) Is to decide.
In the paper size matrix of FIG. 8, each numerical value (%) indicates a ratio when the normal meandering range of the belt 34 is 100%.
Thereafter, the control device 70 determines whether or not F1 ≧ 1 and F2 ≧ 1, T1orT2 ≦ T0. If these conditions do not match, the subroutine (1) (abnormal processing) shown in FIG. ) And if these conditions are met, the process proceeds to a step of detecting the actual meandering balance of the belt 34.
[0026]
Next, meandering adjustment by meandering balance detection by the control device 70 will be described as follows.
That is, the control device 70 operates the timer according to the change timings of the statuses S1 and S2 of the meandering limit detection sensors 71 and 72, and sets the meandering time (T1, T2) a predetermined number of times (N = 4 in this embodiment). : T1 and T2 are sampled twice) and averaged based on the sampling(T 1 ( Ave ), T 2 ( Ave ))To determine whether T1 (Ave) = T2 (Ave).
Here, if T1 (Ave) = T2 (Ave), after substituting T0 = T1 (Ave) and T1 = T2 = 0, the step of whether F1 ≧ 1 and F2 ≧ 1, T1orT2 ≦ T0 is set. Return.
[0027]
On the other hand, if T1 (Ave) ≠ T2 (Ave), for example, if T1> T2, the subroutine (2) shown in FIG. 7B is executed after setting F1 = F1 + 1, and if T2> T1, After setting F2 = F2 + 1, subroutine (2) is executed.
In subroutine {circle around (2)}, if F1 or F2> 2, abnormal processing similar to subroutine {1} is executed, and if F1orF2 ≦ 2, the statuses (S1, S2) of meandering limit detection sensors 71, 72 are confirmed. After that, the steering center axis moving device 60 is controlled based on the center axis moving amount due to the time difference between T1 and T2 shown in FIG.
The table shown in FIG. 9 is obtained in advance by experiment to determine the relationship between the time difference between T1 and T2 and the amount of movement of the central axis of the steering roll 33.
[0028]
As described above, when the shifting 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, and the belt 34. It is possible to substantially balance the shifting speed.
At this time, the meandering range of the steering roll 33 accompanying the rotation of the steering motor 51 is constant regardless of the position of the central axis moving motor 63.
[0029]
Further, in the present embodiment, as shown in FIG. 10, when the paper 40 does not pass over the belt 34, the belt 34 moves in the opposite direction (left → right) from the meandering in the width direction right → left. Although there is almost no difference in the meandering time, when the paper 40 passes (when the paper passes), there is a difference in the meandering time in the meandering direction as the paper 40 is rubbed.
Under such circumstances, in the present embodiment, the above-described belt meandering control operation is executed when the belt 34 passes the paper meandering balance easily.
[0030]
Embodiment 2
FIG. 11 shows a second embodiment of a belt fixing apparatus 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 the belt meandering adjusting device 80 for the steering roll 33 used in the belt conveying device 30 is different from that of the first embodiment.
In the present embodiment, as shown in FIGS. 11 and 12, the belt meandering adjustment device 80 has a pair of sun gears 85 and 86 (internal gears) fixedly disposed on a support bracket 89, and each sun gear. Three planetary gears 87, which are positionally restrained by a carrier 88, are meshed with 85 and 86, and a driving motor 81 is connected to each corresponding planetary gear 87 of the pair of sun gears 85 and 86 via a one-way gear (not shown). An eccentric cam 82 having an eccentric locking portion 83 formed at a portion eccentric from the rotary shaft is provided on one end side of the rotary shaft of the drive motor 81 with a one-way gear (with planetary gear 87) (not shown). And the eccentric locking portion 83 of the eccentric cam 82 and the rotating shaft support portion of the steering roll 33 are connected to each other via a link machine. 84 is obtained so as to connected with.
[0031]
Therefore, according to the present embodiment, as shown in FIG. 13A, 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 each other and the eccentric cam 82 is connected. Rotates to adjust the alignment position of the steering roll 33.
At this time, since the rotating shaft of the drive motor 81 and the planetary gear 87 are in an idle state via the one-way gear, the planetary gear 87 group does not travel planetarily around the sun gears 85 and 86.
[0032]
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 rotation shaft of the drive motor 81 and the planetary gear 87 are connected to each other. The group rotates around the sun gears 85 and 86 in the direction of arrow C, the attachment position of the drive motor 81 moves along the movement locus of the planetary gear 87 group, and the central axis of the steering roll 33 moves.
At this time, since the rotating shaft of the drive motor 81 and the eccentric cam 82 are idle via the one-way gear, the eccentric cam 82 does not rotate.
[0033]
Thus, in the present embodiment, by changing the rotation direction of the drive motor 81, the normal meandering control of the steering roll 33 or the movement control of the central axis of the steering roll 33 is performed.
[0034]
Embodiment 3
FIG. 14 is an explanatory view showing a main part of a third embodiment of the belt fixing device to which the present invention is applied.
In the figure, the basic configuration of the belt conveyance device is substantially the same as that of the first embodiment, but the meandering balance prediction method 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 conveying device 30 are supported by the load measuring devices 91 and 92, and for example, the load balance when the circumferential length at both ends in the width direction of the belt 34 changes due to changes over time. And the central axis of the steering roll 33 is moved so that the meandering balance when the belt 34 reciprocates is substantially balanced based on this measured load difference.
Here, the relationship between the amount of movement of the central axis of the steering roll 33 and the measured load difference may be obtained in advance through experiments or the like.
[0035]
【The invention's effect】
  As described above, according to the present invention, the attachment position of the alignment adjusting means is moved,The meandering balance when the belt reciprocates is almost balancedSince the meandering axis of the steering roll can be moved, the meandering balance of the belt can be adjusted by moving the center axis of the steering roll (meandering center axis) in the direction in which the belt is difficult to return when the meandering balance of the belt is lost. It can be easily adjusted to an equilibrium state.
  For this reason, it is possible to effectively prevent a change in the circumference of the belt itself and a change in meandering balance when the belt reciprocates due to the type of the conveyance medium on the belt, and it is possible to stabilize the meandering control of the belt.
[0036]
In particular, in the present invention, if the meandering balance of the belt is detected, and the center axis of the steering roll is moved so that the meandering balance of the belt is substantially balanced based on the detection result, the meandering balance of the belt is always maintained. The meandering adjustment of the belt can be performed in the monitored state, and accordingly, a situation where the belt is damaged beyond the meandering control range can be surely avoided.
[0037]
Further, in the present invention, the meandering balance of the belt is predicted from the main meandering factors of the belt (such as the difference in the circumference of the belt and the type of the conveyance medium), and the meandering balance of the belt is substantially balanced based on the prediction result. If the center axis of the steering roll is moved, the belt meandering balance can be predicted in advance, and the belt meandering balance can be effectively avoided beforehand and the belt meandering control can be stabilized. Can be done automatically.
[Brief description of the drawings]
FIGS. 1A and 1B are explanatory views showing an outline of a belt meandering adjustment device according to the present invention.
2A is an explanatory diagram showing an example of the behavior of a steering roll of a belt meandering adjustment device according to the present invention, FIG. 2B is an explanatory diagram showing a meandering range of each steering roll, and FIG. It is explanatory drawing which shows the effect | action of the belt meandering adjustment apparatus which concerns.
FIG. 3 is an explanatory view showing Embodiment 1 of a belt fixing device to which the present invention is applied.
FIG. 4 is an explanatory diagram showing 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 apparatus used in the first embodiment.
FIG. 6 is an explanatory diagram showing a flowchart of belt meandering control used in the first embodiment.
FIGS. 7A and 7B are explanatory diagrams showing subroutines (1) and (2) (SUB (1) and SUB (2)) in the flowchart of FIG. 6;
FIG. 8 is an explanatory diagram showing a central axis matrix according to paper types used in the first embodiment.
FIG. 9 is a graph for determining a center axis movement amount based on a time difference between T1 and T2 used in subroutine (2) in FIG. 7B.
FIG. 10 is an explanatory diagram showing a difference in meandering time depending on the presence or absence of paper passing in the first embodiment.
FIG. 11 is an explanatory diagram showing a second embodiment of a belt fixing device to which the present invention is applied.
FIG. 12 is an explanatory plan view of a belt meandering adjustment device used in the second embodiment.
13A is an explanatory view showing normal alignment adjustment of the belt meandering adjustment apparatus according to the second embodiment, and FIG. 13B is an explanatory view showing center axis movement adjustment of the steering roll.
FIG. 14 is an explanatory diagram showing a main part of a third embodiment of a belt fixing device to which the present invention is applied.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 1 ... Roll group, 1s ... Steering roll, 2 ... Belt, 3 ... Alignment adjustment means, 4 ...MeanderCenter axis moving means, 5 ... meandering balance detecting means, 6, 8 ... meandering balance adjusting means, 7 ... meandering balance predicting means, 9 ... transport medium

Claims (7)

A plurality of roll groups (1) including at least tiltable steering rolls (1s) for adjusting meandering are arranged in parallel, and an endless belt (2) is stretched over these roll groups (1). 2) In a belt conveyance device for circulating and conveying
Meandering center axis moving means (4) for moving the meandering center axis of the steering roll (1s) so that the meandering balance during reciprocation of the belt (2) is substantially balanced ;
A belt meandering adjustment device comprising alignment adjusting means (3) for adjusting the alignment of the steering roll (1s) with a predetermined alignment width about the meandering central axis. A plurality of roll groups (1) including at least tiltable steering rolls (1s) for adjusting meandering are arranged in parallel, and an endless belt (2) is stretched over these roll groups (1). 2) In a belt conveyance device for circulating and conveying
Meandering center axis moving means (4) for moving the meandering center axis of the steering roll (1s) so that the meandering balance during reciprocation of the belt (2) is substantially balanced ;
Alignment adjusting means (3) for adjusting the alignment of the steering roll (1s) with a predetermined alignment width around the meandering central axis;
Meandering balance detection means (5) for detecting meandering balance at the time of reciprocation in a direction orthogonal to the moving direction of the belt (2);
Based on the meandering balance during reciprocation detected by the meandering balance detection means (5), meandering center axis moving means for moving the center axis of the steering roll (1s) so that the meandering balance during reciprocation is substantially balanced. And a meandering balance adjusting means (6) for adjusting (4). A plurality of roll groups (1) including at least tiltable steering rolls (1s) for adjusting meandering are arranged in parallel, and an endless belt (2) is stretched over these roll groups (1). 2) In a belt conveyance device for circulating and conveying
Meandering center axis moving means (4) for moving the meandering center axis of the steering roll (1s) so that the meandering balance during reciprocation of the belt (2) is substantially balanced ;
Alignment adjusting means (3) for adjusting the alignment of the steering roll (1s) with a predetermined alignment width around the meandering central axis;
Meandering balance prediction means (7) for predicting the meandering balance at the time of reciprocation of the belt (2) based on the factor of fluctuation of the meandering balance at the time of reciprocation in the direction orthogonal to the moving direction of the belt (2);
Based on the meandering balance during reciprocation predicted by the meandering balance predicting means (7), meandering center axis moving means for moving the center axis of the steering roll (1s) so that the meandering balance during reciprocation is substantially balanced. A belt meandering adjustment device comprising meandering balance adjustment means (8) for adjusting (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 when the belt (2) moves forward and backward based on a detection signal from the sensor. A belt meandering adjustment apparatus comprising: a measuring means for measuring meandering information; and a meandering balance determining means for determining a meandering balance during reciprocation of the belt (2) based on information from the measuring means.   5. The belt meandering adjusting device according to claim 4, wherein the meandering balance detecting means (5) operates in the process of transporting the transport medium (9) onto the belt (2).   The meandering balance predicting means (7) according to claim 3, wherein the meandering balance predicting means (7) predicts the meandering balance at the time of reciprocation of the belt (2) based on various information relating to the transport medium (9) on the belt (2). A belt meandering adjustment device characterized by the above.   The meandering balance predicting means (7) according to claim 3, wherein the meandering balance predicting means (7) predicts the meandering balance at the time of reciprocation of the belt (2) based on a circumferential length difference at a direction end perpendicular to the moving direction of the belt (2). A belt meandering adjusting device characterized by being a thing.

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