JP2008308282A - Conveying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveying device capable of performing stable conveyance according to normal/reverse rotation without applying a load an object to be conveyed when the object is conveyed by a plurality of conveying rollers. <P>SOLUTION: This conveying device includes: a first motor; a second motor different from the first motor; the first conveying roller driven by the first motor and conveying the object to be conveyed; the second conveying roller driven by the second motor and conveying the object to be conveyed; a first drive circuit driving the first motor; a second drive circuit driving the second motor; a detection part detecting the conveying state of the second conveying roller; and a speed control part controlling the first drive circuit to drive the first motor so that the first conveying roller is brought into in a state of being incorporated with the detected conveying state of the second conveying roller. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a conveyance device that conveys various conveyance objects, and particularly relates to conveyance control of an image forming apparatus that conveys a conveyance object such as transfer paper.

When transferring a transfer sheet as a transfer object in an image forming apparatus or the like, the transfer sheet may be transferred across two different transfer rollers.
In the case of performing such conveyance, in Patent Document 1 below, a plurality of conveyance rollers are driven by an endless belt or the like by a single drive motor, and the transfer paper is conveyed by the plurality of conveyance rollers. .

  In addition, by connecting a one-way clutch to the downstream roller at the connecting part of the image forming apparatus main body and the subsequent post-processing apparatus, and transporting the upstream side so as to provide a speed difference slightly faster, On the side, the one-way clutch was operated and pulled out.

When the transfer paper is transported across a plurality of transport rollers, if a difference in speed of the transport rollers occurs, if the transfer paper is pulled, a load is applied to the transfer paper or the toner image on the transfer paper Problems such as rubbing and dirt may occur.
JP 2003-215842 A (first page, FIG. 1)

In the invention described in Patent Document 1 described above, when a speed difference is generated between the two transport rollers, there is a problem that it is not possible to perform control to eliminate the speed difference.
Further, the method in which the upstream side is driven slightly faster and the one-way clutch is provided on the downstream side has a problem that it can only be used for conveyance in one direction, and cannot be used in a place where the conveyance direction is switched by forward and reverse rotation.

  Further, it is conceivable to drive at least one of the plurality of transport rollers with a stepping motor. In this case, however, there is a possibility that the stepping motor may step out due to a difference in transport speed.

  The present invention has been made to solve the above-described problems, and stably transports in correspondence with forward and reverse operations without imposing a burden on the object to be transported when transported by a plurality of transport rollers. An object is to realize a transfer device capable of performing the above.

The present invention for solving the above problems is as described below.
(1) The invention according to claim 1 is a first motor, a second motor different from the first motor, and a first transport roller that is driven by the first motor and transports a transport object. A second transport roller that is driven by the second motor to transport the transport object, a first drive circuit unit that drives the first motor, and a second that drives the second motor. The driving circuit unit, the detection unit for detecting the conveyance state of the second conveyance roller, and the first conveyance roller so as to cooperate with the detected conveyance state of the second conveyance roller. And a speed control unit that controls the first drive circuit unit to drive the first motor.

  (2) The invention according to claim 2 is characterized in that the speed controller is configured such that the first transport roller is at a timing when the transport object is transported by the first transport roller and the second transport roller. However, the first drive circuit unit controls to drive the first motor so as to cooperate with the detected transport state of the second transport roller. Item 2. The conveyance device according to Item 1.

  (3) In the invention according to claim 3, the speed control unit can switch the transport direction of the transport object by forward / reverse operation, and the first transport roller and the second transport can be switched by switching the transport direction. 3. The transport device according to claim 1, wherein the control of the first motor is changed by changing the upstream / downstream position of the transport roller. 4.

  (4) The invention according to claim 4 is characterized in that the first motor and the second motor are different types of motors. It is a conveyance apparatus of description.

  (5) The invention according to claim 5 is characterized in that the first motor is a stepping motor and the second motor is a motor other than the stepping motor. It is a conveyance apparatus as described in any one item.

  (6) In the invention according to claim 6, the speed control unit predicts a transport speed at a control execution timing based on the detected transport state of the second transport roller, and the predicted transport speed. The conveyance device according to any one of claims 1 to 5, wherein the control is executed on the basis of the above.

According to the present invention, the following effects can be obtained.
(1) In the first aspect of the present invention, the first drive roller that is driven to rotate by the first motor driven by the first drive circuit section and transports the object to be transported, and the second drive circuit section In a transport device that includes a second transport roller that is rotationally driven by the driven second motor and transports a transport target, the transport state of the second transport roller is detected by the detection unit, The first drive circuit unit controls the first motor according to the control of the speed control unit so that the transport state of the transport roller is in a state of cooperating with the transport state of the second transport roller detected by the detection unit. To drive.

  Thereby, the conveyance state of a 1st conveyance roller will be in the state which cooperated with the conveyance state of the 2nd conveyance roller detected by the detection part. Here, “cooperation” means a state in which acceleration, deceleration, speed fluctuation, or the like follows. As a result, the transport state of the first transport roller and the transport state of the second transport roller follow, including speed fluctuations. In addition, since it is not necessary to use a one-way clutch, the operation is not limited to one direction, and the forward / reverse operation can be handled. Accordingly, it is possible to realize a transport device that can perform stable transport in accordance with forward and reverse operations without imposing a burden on the transport object when transported by a plurality of transport rollers.

  (2) In the invention described in claim 2, at the timing when the object to be conveyed is conveyed by the first conveyance roller and the second conveyance roller, the conveyance state of the first conveyance roller is detected by the detection unit. The first drive circuit unit drives the first motor in accordance with the control of the speed control unit so as to cooperate with the transport state of the second transport roller.

  As a result, at the timing when the first transport roller and the second transport roller are transporting the same transport target, the speed of the transport state of the first transport roller and the transport state of the second transport roller change. Will follow. Accordingly, it is possible to realize a transport device that can perform stable transport in accordance with forward and reverse operations without imposing a burden on the transport object when transported by a plurality of transport rollers.

  (3) In the invention according to claim 3, the speed control unit is configured to be able to switch the transport direction of the transport object by a forward / reverse operation, and the first transport roller and the second transport roller can be switched by switching the transport direction. By changing the upstream / downstream position of the transport roller, the control of the first motor is changed so that a load such as pulling is not applied to the transport target. As a result, it is possible to realize a transport apparatus that can perform stable transport in response to forward / reverse operation without imposing a burden on the transport object.

  (4) In the invention according to claim 4, even when the first motor and the second motor are different types of motors, the transport state of the first transport roller and the transport state of the second transport roller are Will follow, including speed fluctuations. Accordingly, it is possible to realize a transport device that can perform stable transport in accordance with forward and reverse operations without imposing a burden on the transport object when transported by a plurality of transport rollers.

  (5) In the invention described in claim 5, when the first motor is a stepping motor and the second motor is a motor other than the stepping motor, the acceleration, deceleration, and speed fluctuations generated in the second motor are prevented. Thus, the first motor cooperates, and the conveyance state of the first conveyance roller and the conveyance state of the second conveyance roller follow up including the speed fluctuation. Accordingly, it is possible to realize a transport device that can perform stable transport in accordance with forward and reverse operations without imposing a burden on the transport object when transported by a plurality of transport rollers.

  (6) In the invention according to claim 6, the speed controller predicts the transport speed at the control execution timing based on the detected transport state of the second transport roller, and sets the predicted transport speed to the predicted transport speed. Since the control is executed based on the control, it is possible to appropriately execute the above-described controls (1) to (5), and a burden is imposed on the object to be transported when transported by a plurality of transport rollers. It is possible to realize a transport apparatus that can perform stable transport in response to forward / reverse operation without being applied.

The best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described below in detail with reference to the drawings.
<First Embodiment>
Conveyor configuration:
FIG. 1 is a block diagram illustrating a configuration of a main part related to the conveyance of the image forming apparatus 100 to which the conveyance device of the first exemplary embodiment of the present invention is applied. In FIG. 1, the periphery of the part necessary for the description of the operation of the characteristic part of the present embodiment is mainly described, and other parts known as an image forming apparatus and a conveyance apparatus, a power supply circuit, a power switch, etc. Is omitted.

  FIG. 2 is a configuration diagram illustrating a configuration of a main part related to image formation of the image forming apparatus 100 to which the conveyance device is applied. Here, as an example, an electrophotographic monochrome image forming apparatus is used as a specific example. In FIG. 2, the periphery of the part necessary for the description of the operation of the characteristic part of the present embodiment is mainly described, and other parts known as the image forming apparatus are omitted.

  First, the configuration and operation of the image forming apparatus 100 will be described with reference to FIG. Transfer paper as a conveyance object is stacked on the paper supply unit 150, and the transfer paper is fed out to the conveyance path 161 by a paper supply roller (not shown). The transferred transfer paper is transferred at a predetermined constant speed suitable for image formation, and a toner image is transferred from an image carrier 170 such as a photosensitive drum or a photosensitive belt. The transfer paper on which the toner image has been transferred is transported through a transport path 162, and the toner image is fixed on the transfer paper by the fixing unit 180 by heating and pressing. The transfer sheet is reversely conveyed in a switchback manner by the reversal conveyance unit 163 as necessary, and is reversed, and is discharged with the image forming surface facing downward. In the reverse conveyance path 163, switchback is executed at a speed higher than a predetermined conveyance speed so that no collision occurs between the reversed transfer paper and the subsequent transfer paper.

  When performing double-sided image formation, the transfer paper fixed by the fixing unit 180 is guided to the circulation conveyance path 164, and is reversed by the switchback type reversal conveyance in the circulation reversal conveyance path 165, and further the circulation conveyance path. The back surface image is formed by being guided from 166 to the conveyance path 161. In this reversal conveyance path 165 as well, switchback is executed at a speed higher than a predetermined conveyance speed so that no collision occurs between the reversed transfer sheet and the subsequent transfer sheet.

Next, the configuration of the image forming apparatus 100 and the conveyance control operation will be described with reference to FIG.
The speed control unit 110 includes a CPU 101, a ROM 103, a RAM 105, and a calculation unit 107. Here, the control unit 101 that controls each unit executes predetermined control using programs stored in the ROM 103 and various control data. At this time, the RAM 105 is used as a work memory. The calculation unit 107 performs calculation for speed control based on the control of the control unit 101.

  The first drive circuit unit 120A (hereinafter simply “drive circuit unit 120A”) drives the first motor 130A (hereinafter simply “motor 130A”) based on the speed control of the speed control unit 110. The second drive circuit unit 120B (hereinafter simply “drive circuit unit 120B”) drives the second motor 130B (hereinafter simply “motor 130B”) based on the speed control of the speed control unit 110. The rotation detector 140 detects the rotation of the motor 130 </ b> B and transmits the detection result to the speed controller 110. Note that the rotation detection unit 140 may be externally attached to the motor 130B or may be incorporated therein. The rotation detection unit 140 may directly detect the rotation of the motor 130B or may detect it through a transmission unit such as a gear.

Next, with reference to FIG. 3, a configuration related to transfer sheet transfer by the transfer roller will be described.
A first conveying roller 160A (hereinafter simply referred to as “conveying roller 160A”) that is driven by the motor 130A via the transmission unit 150A and conveys the object to be conveyed, and a conveyance target that is driven by the motor 130B via the transmission unit 150B. A second conveyance roller 160B that conveys an object (hereinafter simply referred to as “conveyance roller 160B”) and a rotation detection unit 140 that detects the conveyance state of the conveyance roller 160B are provided.

  Here, the conveyance state of the conveyance roller 160B is detected by the rotation detection unit 140, and the conveyance state of the conveyance roller 160A is in a state of cooperating with the conveyance state of the conveyance roller 160B detected by the rotation detection unit 140. In addition, the drive circuit unit 120A drives the motor 130A under the control of the speed control unit 110.

  Note that “cooperation” means a state in which acceleration, deceleration, or speed fluctuation follows. Further, “cooperation” means a state in which acceleration, deceleration, speed fluctuation, or the like follows, and a state in which the distances to which the conveyance target is moved in a predetermined time are equal. That is, even when the speed fluctuation does not completely match, if the moving distances within the predetermined time are equal, it is equivalent to following as a result.

  In addition, at the timing when the conveyance object is conveyed by the conveyance roller 160A and the conveyance roller 160B, the conveyance state of the conveyance roller 160A cooperates with the conveyance state of the conveyance roller 160B detected by the rotation detection unit 140; Thus, the drive circuit unit 120A drives the motor 130A in accordance with the control of the speed control unit 110.

  Further, the speed control unit 110 is configured to be able to switch the transport direction of the transport object by forward / reverse operation, and the upstream / downstream positions of the transport roller 160A and the transport roller 160B can be changed by switching the transport direction. By changing, the control of the motor 130A is changed so as not to put a burden such as pulling on the object to be conveyed.

  Further, even when the motor 130A and the motor 130B are different types of motors, the speed controller 110 causes the conveyance state of the conveyance roller 160A and the conveyance state of the conveyance roller 160B to follow each other, including speed fluctuations.

  Further, when the motor 130A is a stepping motor and the motor 130B is a motor other than the stepping motor, the speed control unit 110 controls the motor 130A to cooperate with acceleration, deceleration, and speed fluctuations generated in the motor 130B. To do.

  In this embodiment, the motor 130A is a stepping motor that can be controlled with high accuracy, and the motor 130B is described as a brushless DC motor that is less accurate than the stepping motor.

Transport device operation:
Hereinafter, the operation of the transport apparatus according to the first embodiment will be described in detail with reference to flowcharts and other explanatory drawings.

  First, the speed control unit 110 analyzes the transfer timing of the transfer paper (step S401 in FIG. 4). Here, it is analyzed whether or not it is the timing when the transfer paper spans a plurality of rollers driven by different motors with reference to the paper feed timing, detection results of various sensors, the conveyance speed, and the like.

Here, attention is paid to a plurality of pairs of rollers determined as targets to be controlled in the present embodiment.
If it is not the timing at which the transfer paper spans a plurality of rollers (NO in step S402 in FIG. 4), each roller is independently controlled by predetermined normal control (step S403 in FIG. 4). .

  If it is the timing when the transfer paper spans a plurality of rollers (YES in step S402 in FIG. 4), first, the conveyance speed of the conveyance roller 160B as the second drive side detected by the rotation detection unit 140 is detected (FIG. 4 in step S404). In addition, when the rotation detection part 140 is arrange | positioned at the motor 130B, the rotational speed of the motor 130B is detected.

Here, the speed control unit 110 checks whether or not a change of direction occurs in the transfer of the transfer paper being controlled (step S405 in FIG. 4).
If there is no direction change in the transfer of the transfer paper under control (NO in step S405 in FIG. 4), the transport state of the transport roller 160A depends on the transport speed of the transport roller 160B in the forward transport state. Then, the speed controller 110 calculates the transport speed of the transport roller 160A and the rotation speed of the motor 130A according to the calculation so as to cooperate with the transport state of the transport roller 160B (step in FIG. 4). S406). Then, the drive circuit unit 120A drives the motor 130A based on the control of the speed control unit 110 so as to achieve the calculated rotation speed (step S407 in FIG. 4).

  Here, “cooperation” means a state in which the conveyance roller 160B follows the conveyance roller 160A, including acceleration, deceleration, or speed fluctuation. Further, “cooperation” means a state in which acceleration, deceleration, speed fluctuation, or the like follows, and a state in which the distances to which the conveyance target is moved in a predetermined time are equal. That is, even when the speed fluctuation does not completely match, if the moving distances within the predetermined time are equal, it is equivalent to following as a result.

  As a result, the transport state of the transport roller 160A and the transport state of the transport roller 160B follow, including speed fluctuations. Therefore, it is possible to realize a transport device that can perform stable transport without placing a burden on the transport object when transported by a plurality of transport rollers.

  For example, when the motor 130A has the acceleration characteristic shown by the solid line in FIG. 5 and the motor 130B has the acceleration characteristic shown by the broken line in FIG. 5, when the transfer sheet does not straddle the conveyance roller 160A and the conveyance roller 160B, the speed control unit 110 Can drive each motor independently under normal control.

  When the motor 130A has the acceleration characteristic shown by the solid line in FIG. 5 and the motor 130B has the acceleration characteristic shown by the broken line in FIG. 5, and the transfer paper straddles the conveyance roller 160A and the conveyance roller 160B, the speed control unit As described above, 110 detects the rotational speed of the motor 130B from the transport speed of the transport roller 160B, and controls the motor 130A to cooperate with the motor 130B. In this case, also for the motor 130A, the acceleration characteristic is the acceleration characteristic indicated by the broken line in FIG. For example, when the transfer sheet spans between the transport roller 160A and the transport roller 160B by speed switching by acceleration as shown in FIG. 6B, the speed control unit 110, as described above, sets the speed of the transport roller 160B. The rotational speed of the motor 130B is detected from the conveyance speed, and the motor 130A is controlled to cooperate with the motor 130B.

  In this case, since the transport states of the two transport rollers that transport the transfer paper coincide with each other, there is no need to use a one-way clutch as in the prior art, and the operation is not limited to one direction. It becomes possible to cope with. Accordingly, it is possible to realize a transport device that can perform stable transport in accordance with forward and reverse operations without imposing a burden on the transport object when transported by a plurality of transport rollers.

  In this case, it is desirable that the transport speeds of the two transport rollers are made to coincide with each other as much as possible. However, if it is difficult to completely match the transport speeds of the two transport rollers, the downstream transport roller is connected to the upstream side. By controlling so as to be slightly faster than the side, the transfer paper is not pulled and stable conveyance can be realized.

  In the case where a change of direction occurs in the transfer of the transfer paper under control (FIG. 6A, YES in step S405 in FIG. 4), in the state of carrying in the reverse direction, the transfer roller according to the transfer speed of the transfer roller 160B. The speed control unit 110 calculates the conveyance speed of the conveyance roller 160A and the rotation speed of the motor 130A according to the calculation so that the conveyance state of 160A becomes a state cooperating with the conveyance state of the conveyance roller 160B ( Step S408 in FIG. Then, the drive circuit unit 120A drives the motor 130A based on the control of the speed control unit 110 so as to achieve the calculated rotation speed (step S409 in FIG. 4).

  In this case, it is desirable that the transport speeds of the two transport rollers be made to coincide with each other as much as possible. However, when it is difficult to completely match the transport speeds of the two transport rollers, the downstream transport roller is moved from the upstream side. By controlling the operation so as to be slightly faster, the transfer paper is not pulled and stable conveyance can be realized.

  Here, “cooperation” means a state in which the conveyance roller 160B follows the conveyance roller 160A, including acceleration, deceleration, or speed fluctuation. As a result, the transport state of the transport roller 160A and the transport state of the transport roller 160B follow, including speed fluctuations. Therefore, it is possible to realize a transport device that can perform stable transport without placing a burden on the transport object when transported by a plurality of transport rollers.

  Also, in this case, since the transport states of the two transport rollers that transport the transfer paper match, there is no need to use a one-way clutch, and the operation is not limited to one direction, so that it can cope with forward and reverse operations. become. Accordingly, it is possible to realize a transport device that can perform stable transport in accordance with forward and reverse operations without imposing a burden on the transport object when transported by a plurality of transport rollers.

  Even if the speed of the transport roller 160B causes an overshoot or undershoot as shown in FIG. 7 due to various inertias, the transport state of the transport roller 160A depends on the transport speed of the transport roller 160B. The speed control unit 110 calculates the transport speed of the transport roller 160A and the rotation speed of the motor 130A according to the calculation so as to cooperate with the transport state of the transport roller 160B (step S406 in FIG. 4). , S408). Then, the drive circuit unit 120A drives the motor 130A based on the control of the speed control unit 110 so as to achieve the calculated rotation speed (steps S407 and S409 in FIG. 4).

  Also in this case, when it is difficult to completely match the transport speeds of the two transport rollers, the transfer paper is pulled by controlling the downstream transport rollers to be slightly faster than the upstream. Therefore, stable conveyance can be realized.

  In the above embodiment, since detection, calculation, control, and driving may take some time, the motor 130A and the conveyance roller are actually referred to by referring to past trends in the conveyance speed of the conveyance roller 160B. It is desirable to predict the transport speed of the transport roller 160B at the timing for controlling 160A, and calculate the speed control based on the predicted value.

  In other words, in the above embodiment, when the calculation unit 107 in the speed control unit 110 needs to calculate the speed Y1 at the time X1, it refers to the speed S1 at the time T1 and the speed S2 at the time T2. Control for predicting the speed Y1 of X1 may be performed. In this way, appropriate control corresponding to speed fluctuations can be executed.

  In this case, an appropriate calculation may be performed in the case where the speed fluctuates or the conveyance direction is reversed (steps S205, S206, and S208 in FIG. 4). For such calculation, it is desirable to store data such as the motor characteristics and the characteristics of the transmission unit and the transport roller in the ROM 203 in advance.

<Second Embodiment>
FIG. 8 is an explanatory diagram showing the configuration of the second exemplary embodiment of the present invention. Here, a specific example is shown in which a post-processing device 200 is connected to the image forming apparatus 100.

  In this case, the timing at which the same transfer paper is transported by the final transport roller of the image forming apparatus 100 and the first transport roller of the post-processing apparatus 200 occurs. And each conveyance roller is controlled by each speed control part 110,210. Further, the speed control units 110 and 210 are configured to be able to perform coordinated control by communicating with each other.

  Here, the motor 130 for driving the final conveyance roller on the image forming apparatus 100 side is a high-precision motor, for example, a stepping motor, and the motor 230 for driving the first conveyance roller of the post-processing apparatus 200 is relatively accurate. In the case of a bad brushless DC motor, the rotation detection unit 240 detects the speed of the motor 230 and the conveyance roller on the post-processing apparatus 200 side, and transmits the detection result to the speed control unit 110 on the image forming apparatus 100 side. 110 executes control for causing the motor 230 to cooperate with the speed control of the motor 130. Thereby, stable conveyance can be realized between the image forming apparatus 100 and the post-processing apparatus 200.

<Third Embodiment>
FIG. 9 is an explanatory diagram showing the configuration of the third embodiment of the present invention. Here, a specific example is shown in which a post-processing device 200 is connected to the image forming apparatus 100.

  In this case, the timing at which the same transfer paper is transported by the final transport roller of the image forming apparatus 100 and the first transport roller of the post-processing apparatus 200 occurs. And each conveyance roller is controlled by each speed control part 110,210. Further, the speed control units 110 and 210 are configured to be able to perform coordinated control by communicating with each other.

  Here, the motor 130 for driving the final transport roller on the image forming apparatus 100 side is a brushless DC motor with relatively low accuracy, and the motor 230 for driving the first transport roller of the post-processing device 200 is a motor with high accuracy. For example, in the case of a stepping motor, the rotation detection unit 140 detects the speed of the motor 130 and the conveyance roller on the image forming apparatus 100 side, and transmits the detection result to the speed control unit 210 on the image post-processing apparatus 200 side. The unit 210 executes control for causing the motor 130 to cooperate as speed control of the motor 230. Thereby, stable conveyance can be realized between the image forming apparatus 100 and the post-processing apparatus 200.

  Further, not only between the image forming apparatus 100 and the post-processing apparatus 200, but also when a plurality of post-processing apparatuses 200, 300 (not shown) and 400 (not shown) are connected to the post-processing apparatus. Similarly, the same control as described above can be executed between the post-processing apparatuses, and good conveyance can be realized.

<Other embodiments>
In the above specific example, the same transfer sheet is transported by two transport rollers. However, the same transport roller may be transported by three or more transport rollers. In that case, it is only necessary to detect the speed of one specific transport roller or motor and execute control to cooperate with the speeds of the other transport rollers or motors.

It is a functional block diagram which shows the structure of the conveying apparatus of the 1st Embodiment of this invention. 1 is a configuration diagram illustrating a configuration of an image forming apparatus to which a conveyance device according to an embodiment of the present invention is applied. It is a block diagram which shows the structure of the conveying apparatus of embodiment of this invention. It is a flowchart which shows the processing operation of embodiment of this invention. It is a characteristic view which shows the characteristic at the time of the process of embodiment of this invention. It is a characteristic view which shows the characteristic at the time of the process of embodiment of this invention. It is a characteristic view which shows the characteristic at the time of the process of embodiment of this invention. It is a functional block diagram which shows the structure of the conveying apparatus of the 2nd Embodiment of this invention. It is a functional block diagram which shows the structure of the conveying apparatus of the 3rd Embodiment of this invention. It is a characteristic view which shows the characteristic at the time of the process of embodiment of this invention.

Explanation of symbols

100 Conveying device (image forming device)
101 Control unit 103 ROM
105 RAM
107 arithmetic unit 110 speed control unit 120A drive circuit unit (first drive circuit unit)
120B drive circuit section (second drive circuit section)
130A motor (first motor)
130B motor (second motor)
140 Rotation detection unit 160A Conveying roller (first conveying roller)
160B Conveying roller (second conveying roller)

Claims (6)

A first motor;
A second motor different from the first motor;
A first transport roller that is driven by the first motor to transport a transport object;
A second transport roller driven by the second motor to transport the transport object;
A first drive circuit section for driving the first motor;
A second drive circuit section for driving the second motor;
A detection unit for detecting a conveyance state of the second conveyance roller;
The speed at which the first drive circuit unit controls the first motor to drive the first motor so that the first transport roller cooperates with the detected transport state of the second transport roller. A control unit;
A conveying apparatus comprising: The speed controller is configured to detect the second transport roller detected by the first transport roller at a timing when the transport target is transported by the first transport roller and the second transport roller. The first drive circuit unit controls to drive the first motor so as to cooperate with the transport state of
The conveying apparatus according to claim 1. The speed control unit can switch the transport direction of the transport object by forward / reverse operation, and the upstream / downstream positions of the first transport roller and the second transport roller can be switched by switching the transport direction. Changing the control of the first motor by changing,
The conveying apparatus according to claim 1 or 2, characterized by the above. The first motor and the second motor are different types of motors.
The conveying apparatus as described in any one of Claims 1-3 characterized by the above-mentioned. The first motor is a stepping motor, and the second motor is a motor other than the stepping motor.
The conveying apparatus as described in any one of Claims 1-4 characterized by the above-mentioned. The speed control unit predicts a transport speed at a control execution timing based on the detected transport state of the second transport roller, and executes the control based on the predicted transport speed.
The conveying apparatus as described in any one of Claims 1-5 characterized by the above-mentioned.

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