JP2019181721A - Conveyance control device - Google Patents

Abstract

To prevent a conveyance amount from shifting from a target value as compared to a case where an error in conveyance amount corrected by feedback control of a motor is not subjected to reset processing.SOLUTION: A motor 20 is a drive source for driving a conveyance roller 10, and performs feedback control of correcting an error in conveyance amount by conveyance to drive the conveyance roller 10. In response to passage of a medium through a predetermined position, a control part 30 performs reset processing on an error in conveyance amount corrected by the feedback control of the motor 20, and then controls driving of the conveyance roller 10 by the motor 20 to control conveyance of the medium.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a conveyance control device.

  In Patent Document 1, when stopping a carriage on which a recording head of an image forming apparatus is mounted at a target position, the carriage is moved toward the target position by feedback control, and the difference between the target position and the current position is a first error amount. When entering, the feedback loop is cut off and the carriage motor is forcibly stopped. If the difference between the stop position and the target position is within the second error amount smaller than the first error amount, If the stop position is not within the second error amount, the predetermined control variable for feedback control is reset and then the carriage is moved again toward the target position by feedback control. Control method that forcibly stops the carriage motor by interrupting the feedback loop when the difference between the target position and the current position falls within the second error amount. There has been described.

  In Patent Document 2, an actual paper conveyance amount is measured by detecting the position of a weight placed on the paper before and after the paper conveyance by the motor, and the measured actual paper conveyance amount is the paper conveyance amount. An apparatus is described that performs paper conveyance control again to correct this when there is a deviation from the optimum value.

  Patent Document 3 discloses a process for increasing the driving amount of the conveyance roller at the time of executing the bending formation process so that the bending is formed when the sheet is no longer bent between the conveyance roller and the registration roller. Is described.

JP 2003-191560 A JP 2011-068118 A JP 2013-129490 A

  By the way, some motors that are transport driving sources require feedback control that corrects transport amount errors due to transport.

  An object of the present invention is to suppress the deviation of the conveyance amount from a target value as compared with the case where the error of the conveyance amount corrected by the feedback control of the motor is not reset.

  According to a first aspect of the present invention, there is provided a transport roller for transporting the medium, a motor for driving the transport roller by executing feedback control for correcting an error in the transport amount due to the transport, and a position where the medium is predetermined. And a controller that controls the conveyance of the medium after resetting an error in the conveyance amount corrected by the feedback control in response to passing the medium.

  According to a second aspect of the present invention, in the conveyance control device according to the first aspect, the motor starts driving the conveyance roller in accordance with control from the control unit, and the predetermined position is set as a medium. The conveyance control device is characterized in that the feedback control is executed before the conveyance roller is driven to drive the conveyance roller.

  According to a third aspect of the present invention, in the conveyance control device according to the first or second aspect, the first conveyance roller that conveys the medium along the first conveyance path and the first conveyance by executing the feedback control. A first motor that drives the rollers for use, and a registration roller that is provided on a downstream side of a predetermined position of the first transport path, and the control unit is configured to determine the first transport path in advance. The reset process is executed in response to the passage of the medium through the predetermined position, and the first motor by the first motor after a predetermined time after the medium passes through the predetermined position of the first transport path. 1 is a conveyance control device that stops driving of a conveyance roller.

  According to a fourth aspect of the present invention, in the conveyance control device according to any one of the first to third aspects, the second conveyance path branches from the first conveyance path and is connected to a path for reversing the front and back of the medium. And a second motor for executing the feedback control and driving the second transport roller, and the control unit is configured to control the second transport path. The reset process is executed in response to the passage of a medium through a predetermined position, and the second motor is a predetermined time after the medium passes through a predetermined position of the second transport path. The conveyance control device is characterized in that the driving of the second conveyance roller is stopped.

  According to a fifth aspect of the present invention, in the conveyance control device according to the fourth aspect, the control unit drives the second conveyance roller by the rotation of the second motor in the positive direction after the predetermined time. After stopping, the gate that opens and closes the connection path connecting the first transport path and the second transport path is controlled to close the connection path, and then the second motor is rotated in the reverse direction to The conveyance control apparatus is characterized in that the medium is conveyed to the path for reversing the front and back by driving the second conveyance roller in the reverse direction.

  According to the first aspect of the present invention, it is possible to suppress the deviation of the conveyance amount from the target value as compared with the case where the error of the conveyance amount corrected by the feedback control of the motor is not reset.

  According to the second aspect of the present invention, the error in the transport amount accumulated until the medium reaches the predetermined position is reset.

  According to the third aspect of the present invention, the deviation from the target value of the amount of bending for deflecting the medium is smaller than in the case where the error of the transport amount is not reset.

  According to the fourth aspect of the present invention, the deviation of the medium reversal position from the target position is reduced as compared with the case where the carry error is not reset.

  According to the fifth aspect of the present invention, the clogging of the medium by the gate is reduced as compared with the case where the error of the transport amount is not reset.

It is a figure which shows the specific example of a conveyance control apparatus. It is a figure which shows the specific example of the path | route which a conveyance control apparatus controls conveyance. It is a figure which shows the specific example of the conveyance control of loop creation. It is a figure which shows the example of control of a switching gate. It is a figure which shows the specific example of the conveyance control to a reverse position.

  FIG. 1 is a diagram illustrating an example of a specific embodiment of the present invention, and FIG. 1 illustrates a specific example of the transport control device 100. A specific example of the conveyance control apparatus 100 illustrated in FIG. 1 includes a conveyance roller 10, a motor 20, and a control unit 30.

  The transport roller 10 is a roller for transporting a medium. For example, one or more transport rollers 10 are provided in a path for transporting the medium. The conveying roller 10 is driven by a motor 20. For example, one transport roller 10 is driven by one motor 20 corresponding thereto.

  The motor 20 is a drive source that drives the conveyance roller 10, and performs feedback control to drive the conveyance roller 10. For example, the motor 20 drives the conveyance roller 10 by performing feedback control for correcting an error in the conveyance amount due to conveyance of the conveyance roller 10 using the motor 20 as a drive source. One specific example of the motor 20 is a DC (direct current) brushless motor.

  The control unit 30 is a controller that controls the conveyance of the medium. For example, the control unit 30 outputs a control signal and a reset signal to the motor 20 and controls the conveyance of the medium by controlling the driving of the conveyance roller 10 by the motor 20. For example, the start of driving of the conveying roller 10 by the motor 20, the rotation speed of the motor 20, the rotation direction of the motor 20, and the like are controlled by the control signal. Further, for example, an error in the transport amount corrected by feedback control executed by the motor 20 is reset by a reset signal. Then, the control unit 30 controls the conveyance of the medium by using, for example, a detection result obtained from one or more path sensors PS provided in the medium conveyance path.

  The control unit 30 can be realized by using various arithmetic devices such as a CPU as a representative example. For example, the function of the control unit 30 may be realized using a computer. That is, a program (software) corresponding to at least a part of the functions provided in the control unit 30 illustrated in FIG. 1 is read into the computer, and the control unit is configured by cooperation between the hardware resources provided in the computer and the read software. At least a part of the functions of 30 may be realized by a computer. The program may be provided to the computer (control unit 30) via a communication line such as the Internet, or stored in a storage medium such as an optical disk or a semiconductor memory and provided to the computer (control unit 30). Also good.

  FIG. 2 is a diagram illustrating a specific example of a path for which the conveyance control apparatus 100 in FIG. 1 controls conveyance. FIG. 2 shows a specific example of a path provided in an image forming apparatus that executes a printing process on a sheet as a medium. The route of the specific example shown in FIG. 2 includes a transport route R1, a transport route R2, and a transport route R3.

  The conveyance path R <b> 1 conveys a sheet obtained from the upstream side (for example, a sheet storage tray) of the first conveyance roller 11 to the transfer unit and the fixing unit, and conveys the sheet processed by the transfer unit and the fixing unit downstream of the discharge roller 16. It is a route to discharge to the side. The first transport roller 11 that is one of the transport rollers 10 (FIG. 1) transports the paper along the transport path R1. The path sensor PS1 is a sensor that detects that the sheet conveyed by the first conveyance roller 11 passes a predetermined position P1 on the conveyance path R1. Further, a registration roller 14 is provided on the downstream side of the position P1 on the transport path R1, for example, in the vicinity of the downstream side of the path sensor PS1.

  The conveyance path R2 is a path for retracting the sheet conveyed from the conveyance path R1 when performing duplex printing on the sheet. The second transport roller 12 that is one of the transport rollers 10 (FIG. 1) transports the paper along the transport path R2. The path sensor PS2 is a sensor that detects that the paper transported by the second transport roller 12 passes a predetermined position P2 on the transport path R2. Note that the sheet conveyed to the conveyance path R2 may be further conveyed by the discharge roller 18 and discharged.

  The conveyance path R3 is a path that conveys the sheet obtained from the conveyance path R2, reverses the front and back of the sheet, and returns the sheet to the conveyance path R1 when performing duplex printing on the sheet. For example, a sheet whose surface has been printed by the fixing unit and the transfer unit is conveyed from the conveyance path R1 to the conveyance path R2, and further conveyed from the conveyance path R2 to the conveyance path R3, thereby reversing the front and back sides. To return to the transport path R1. The transport path R3 is connected to the transport path R1 on the upstream side of the predetermined position P1 on the transport path R1, for example, on the upstream side of the path sensor PS1.

  In the specific example shown in FIG. 2, a switching gate 40 that opens and closes the connection path is provided in the connection path that connects the transport path R1 and the transport path R2. In a state in which the switching gate 40 closes the connection path (state indicated by a solid line in FIG. 2), the sheet conveyed downstream from the fixing unit along the conveyance path R1 is directly transferred to the discharge roller 16 along the conveyance path R1. It is conveyed toward. On the other hand, in a state where the switching gate 40 opens the connection path (a state indicated by a broken line in FIG. 2), the sheet transported downstream from the fixing unit along the transport path R1 becomes the connection path by the switching gate 40. Guided and transported to the transport path R2 via the connection path.

  The conveyance control apparatus 100 in FIG. 1 controls conveyance of a sheet as a medium in the specific example path illustrated in FIG. In the control, the conveyance control apparatus 100 in FIG. 1 executes a loop creation conveyance control for bending the paper and a front / back reversal conveyance control for inverting the front / back of the paper. Accordingly, the following describes the loop creation conveyance control and the reverse conveyance control executed by the conveyance control device 100 of FIG. In addition, about the structure (part) shown in FIG. 1, FIG. 2, the code | symbol of FIG. 1, FIG. 2 is utilized in the following description.

  FIG. 3 is a diagram illustrating a specific example of conveyance control for creating a loop. For example, in the image forming apparatus having the conveyance path of FIG. 2, the sheet is brought into contact with the registration roller 14 before the image forming process by the transfer unit and the fixing unit in order to correct an angular deviation of the sheet that occurs in the conveyance process. Loop creation is executed.

  In creating the loop, the sheet conveyed by the first conveyance roller 11 is abutted against the registration roller 14, and the sheet is further conveyed by the first conveyance roller 11 while the rotation of the registration roller 14 is stopped. By abutting against the registration roller 14, the angular deviation of the paper is corrected, and the paper is bent. In this loop creation, a deflection amount corresponding to the conveyance amount after the leading end (downstream end) of the sheet hits the registration roller 14 is realized.

  FIG. 3A is a diagram illustrating a change over time in the motor speed of the motor 20 that drives the first transport roller 11. The vertical axis in FIG. 3A is the speed of the motor 20, and the horizontal axis is the time axis. Further, in the specific example shown in FIG. 3, time t1 is a timing at which the sheet conveyed by the first conveying roller 11 passes a predetermined position P1 on the conveying path R1. The timing at which the sheet passes the position P1 is detected by the path sensor PS1. Time t2 is the timing at which the leading edge of the paper that has passed the position P1 reaches the registration roller 14. Time t3 is a timing at which the driving of the first conveying roller 11 by the motor 20 is stopped.

  For example, the time change of the motor speed illustrated in FIG. 3A is created so that the amount of deflection of the paper becomes the target value, and the control signal indicating the time change of the motor speed (for example, the motor speed at each time). Is output from the control unit 30 to the motor 20 that drives the first transport roller 11. Thus, the motor 20 drives the first transport roller 11 in accordance with, for example, the time change of the motor speed exemplified in FIG.

  Further, the motor 20 executes feedback control to drive the first transport roller 11. The motor 20 executes, for example, feedback control for correcting a deviation (error) between a target conveyance amount (target conveyance amount) and an actual conveyance amount. The target transport amount can be calculated by, for example, integral calculation (integral calculation with time as a variable) from the change in the motor speed exemplified in FIG. Further, the control unit 30 may give information related to the target conveyance amount to the motor 20 that drives the first conveyance roller 11.

  FIG. 3B is a diagram illustrating a specific example of the target transport amount and the actual transport amount. In FIG. 3B, the vertical axis represents the amount of paper transport, and the horizontal axis represents the time axis. FIG. 3B shows a specific example of a temporal change in the target transport amount (broken line) and the actual transport amount (solid line). For example, when there is a deviation in the conveyance amount, which is a difference between the target conveyance amount and the actual conveyance amount, as illustrated in FIG. There is.

  For example, when the paper is transported with the transport amount deviation illustrated in FIG. 3B and the path sensor PS1 detects the timing at which the paper passes the position P1, the actual transport amount is smaller than the target transport amount. Therefore, the passage timing detected by the actual conveyance amount is delayed from the passage timing scheduled at the target conveyance amount.

  If it is found that the timing at which the sheet passes through the position P1 is delayed, the motor 20 executes feedback control for correcting the deviation (error) in the conveyance amount, and therefore the conveyance amount accumulated up to the time t1. In order to eliminate the deviation, for example, after time t1, the motor speed is increased by an amount corresponding to the deviation of the conveyance amount. In this way, in the specific example illustrated in FIG. 3B, feedback control is executed so as to eliminate the deviation between the target transport amount and the actual transport amount, for example, at time t3 when the motor 20 is stopped. .

  In the loop creation, the amount of deflection changes according to the amount of conveyance after the leading edge (downstream end) of the sheet hits the registration roller 14. That is, in the specific example shown in FIG. 3B, the amount of deflection is determined by the amount of conveyance from time t2 to time t3. Therefore, in the specific example shown in FIG. 3B, the actual deflection amount obtained with the actual conveyance amount is larger than the target deflection amount planned with the target conveyance amount. In the specific example shown in FIG. 3B, the motor speed is increased after time t1 by the amount corresponding to the deviation of the conveyance amount accumulated until time t1 by feedback control of the motor 20, and from time t1 to time t3. This is because the transport amount increased in number than planned.

  Therefore, the control unit 30 resets the error of the conveyance amount corrected by the feedback control of the motor 20 in response to the sheet passing through the predetermined position P1, and the sheet for creating a loop after the reset process. Control the transport of

  FIG. 3C is a diagram illustrating a specific example of the reset process. FIG. 3C shows a specific example of a temporal change in the target transport amount (broken line) and the actual transport amount (solid line). The time change until time t1, which is the timing at which the path sensor PS1 detects the passage of the paper position P1, is the same as the specific example of FIG.

  In the specific example shown in FIG. 3C, an error in the conveyance amount used for feedback control of the motor 20 is reset in response to the sheet passing through the position P1 at time t1. For example, a reset signal is output from the control unit 30 to the motor 20 so that the carry amount at the time t1 (the carry amount that the motor 20 uses for feedback control) becomes zero, and the reset process is executed. Thereby, the error of the conveyance amount accumulated up to time t1 (deviation from the target conveyance amount) is also zero.

  Then, from time t1 when the sheet passes the position P1, the motor 20 is stopped to stop the driving of the first conveying roller 11 at time t3 after a predetermined time according to the target deflection amount.

  By executing the reset process, the influence of the deviation of the transport amount accumulated up to time t1 on the feedback control of the motor 20 after time t1 is eliminated, and the reset process is not performed (FIG. 3B). Compared to the above, it is possible to prevent the carry amount after time t1 from deviating from the planned carry amount. Thereby, compared with the case where a reset process is not performed, the deviation | shift from the target value of the deflection amount determined by the conveyance amount from the time t2 to the time t3 becomes small.

  In the specific example shown in FIG. 3C, the reset process for setting the transport amount (including error) at time t1 to zero has been described. However, the reset process for setting only the transport amount error at time t1 to zero is performed. It may be broken.

  Next, the conveyance control for reversing the front and back executed by the conveyance control device 100 in FIG. 1 will be described. In the conveyance control for reversing the front and back, the switching gate 40 is used.

  FIG. 4 is a diagram illustrating a control example of the switching gate 40. FIG. 4 shows a specific example of the open / close state of the switching gate 40 provided in the connection path connecting the transport path R1 and the transport path R2.

  FIG. 4A shows the switching gate 40 when maintaining the transport route R1. For example, when performing printing on only one side of a sheet, during single-sided printing, the switching gate 40 is controlled so that the connection path between the transport path R1 and the transport path R2 is closed as illustrated in FIG. Is done. In the gate state of the switching gate 40 illustrated in FIG. 4A, the sheet conveyed downstream from the fixing unit along the conveyance path R1 is conveyed toward the discharge roller 16 as it is along the conveyance path R1. .

  FIG. 4B shows the switching gate 40 at the time of path switching. For example, during double-sided printing in which printing is performed on both sides of a sheet, the switching gate 40 is controlled so that the connection path between the transport path R1 and the transport path R2 is opened as illustrated in FIG. 4B. . In the gate state of the switching gate 40 illustrated in FIG. 4B, the sheet conveyed downstream from the fixing unit along the conveyance path R1 is guided to the connection path by the switching gate 40 and conveyed through the connection path. It is transported toward the route R2.

  FIG. 4 (3) shows a state in which the sheet is conveyed to the reverse position of the conveyance path R2. For example, when the paper is turned upside down for double-sided printing, as illustrated in FIG. 4C, the second transport roller 12 is driven in the forward rotation direction so that the paper transported from the transport path R1 is transported. It is conveyed to the reverse position of R2. Then, after the sheet is transported to the reverse position of the transport path R2, the switching gate 40 is controlled so that the connection path between the transport path R1 and the transport path R2 is closed. Thereafter, the second transport roller 12 is driven in the reverse direction with the switching gate 40 closing the connection path between the transport path R1 and the transport path R2.

  FIG. 4 (4) shows a state in which the second transport roller 12 is driven in the reverse direction. When the second transport roller 12 is driven in the reverse direction in the gate state of the switching gate 40 illustrated in FIG. 4 (4), the sheet at the reverse position of the transport path R2 is transferred by the switching gate 40 to the transport path R3 (front and back). An example of a route for reversal). In this way, the sheet is transported to the transport path R3 so that the front and back are reversed and returned to the transport path R1 (see FIG. 2).

  The conveyance control device 100 in FIG. 1 executes the control described below in the conveyance of the sheet to the reverse position illustrated in FIG.

  FIG. 5 is a diagram illustrating a specific example of the conveyance control to the reverse position. In the specific example shown in FIG. 5, time t1 is the timing at which the sheet conveyed by the second conveying roller 12 passes a predetermined position P2 on the conveying path R2. The timing at which the sheet passes the position P2 is detected by the path sensor PS2. Time t2 is timing when the trailing edge of the sheet that has passed the position P2 passes through the switching gate 40. Time t3 is a timing at which the driving of the second conveying roller 12 by the motor 20 is stopped. Time t4 is a timing at which the rotation direction of the motor 20 is reversed and the second conveyance roller 12 starts driving in the reverse direction.

  FIG. 5A is a diagram illustrating a change over time in the motor speed of the motor 20 that drives the second transport roller 12. The vertical axis in FIG. 5A is the speed of the motor 20, and the horizontal axis is the time axis. For example, the time change of the motor speed illustrated in FIG. 5A is created so that the sheet is conveyed to the target position of the reverse position, and the time change of the motor speed (for example, the motor speed at each time) is shown. A control signal is output from the control unit 30 to the motor 20 that drives the second transport roller 12. Thus, the motor 20 drives the second transport roller 12 in accordance with the time change of the motor speed exemplified in FIG. 5A, for example.

  Further, the motor 20 performs feedback control to drive the second transport roller 12. The motor 20 executes, for example, feedback control for correcting a deviation (error) between a target conveyance amount (target conveyance amount) and an actual conveyance amount. The target transport amount can be calculated, for example, by integral calculation (integral calculation with time as a variable) from the time change of the motor speed illustrated in FIG. Further, the control unit 30 may provide information regarding the target conveyance amount to the motor 20 that drives the second conveyance roller 12.

  FIG. 5B is a diagram illustrating a specific example of the target transport amount and the actual transport amount. In FIG. 5B, the vertical axis represents the amount of paper transport, and the horizontal axis represents the time axis. FIG. 5B shows a specific example of the temporal change of the target transport amount (broken line) and the actual transport amount (solid line). For example, due to the influence of the conveyance resistance generated in the process of conveying the paper, as illustrated in FIG. 5B, a deviation in the conveyance amount that is the difference between the target conveyance amount and the actual conveyance amount occurs. There is.

  For example, when the paper is transported with the transport amount deviation illustrated in FIG. 5B and the path sensor PS2 detects the timing when the paper passes the position P2, the actual transport amount is larger than the target transport amount. Thus, the passage timing detected by the actual conveyance amount is earlier than the passage timing scheduled for the target conveyance amount.

  If it is found that the timing at which the sheet passes the position P2 is early, the motor 20 executes feedback control for correcting the deviation (error) in the conveyance amount, and thus the deviation in the conveyance amount accumulated up to time t1 is detected. In order to eliminate this, for example, after time t1, the motor speed is decreased by an amount corresponding to the deviation of the conveyance amount. Thus, in the specific example illustrated in FIG. 5B, feedback control is executed so as to eliminate the deviation between the target transport amount and the actual transport amount, for example, at time t3 when the motor 20 is stopped. .

  In the conveyance control to the reversal position, the conveyance distance of the sheet changes according to the conveyance amount from time t1 when the sheet passes the position P2 to time t3 when the motor 20 is stopped. That is, in the specific example shown in FIG. 5B, the transport distance is determined by the transport amount from time t1 to time t3. Therefore, in the specific example shown in FIG. 5B, the target transport distance (the time from when the path sensor PS2 detects the passage of the paper until the rear end of the paper passes through the switching gate 40, which is planned with the target transport amount). The actual transport distance obtained with the actual transport amount is smaller than the distance). In the specific example shown in FIG. 5B, by the feedback control of the motor 20, the motor speed is decreased after the time t1 by the amount corresponding to the deviation of the conveyance amount accumulated until the time t1, and from the time t1 to the time t3. This is because the transport amount of the machine decreased from the planned amount.

  If the actual conveyance distance is shorter than the target conveyance distance, the conveyance is stopped before the trailing edge of the sheet passes through the switching gate 40, and the sheet is suppressed by the switching gate 40 by the switching operation of the switching gate 40 thereafter. , Can cause paper jams.

  Therefore, the control unit 30 resets the error in the conveyance amount corrected by the feedback control of the motor 20 in response to the sheet passing through the predetermined position P2, and controls the conveyance of the sheet after the reset process. .

  FIG. 5C is a diagram illustrating a specific example of the reset process. FIG. 5C shows a specific example of a temporal change in the target transport amount (broken line) and the actual transport amount (solid line). The time change until time t1, which is the timing at which the path sensor PS2 detects the passage of the paper position P2, is the same as the specific example of FIG.

  In the specific example shown in FIG. 5C, an error in the conveyance amount used for feedback control of the motor 20 is reset in response to the sheet passing through the position P2 at time t1. For example, a reset signal is output from the control unit 30 to the motor 20 so that the carry amount at the time t1 (the carry amount that the motor 20 uses for feedback control) becomes zero, and the reset process is executed. Thereby, the error of the conveyance amount accumulated up to time t1 (deviation from the target conveyance amount) is also zero.

  Then, the motor 20 is stopped and the driving of the second transport roller 12 is stopped at a time t3 after a predetermined time according to the target transport distance from the time t1 when the sheet passes the position P2.

  By executing the reset process, the influence of the deviation of the transport amount accumulated up to time t1 on the feedback control of the motor 20 after time t1 is eliminated, and the reset process is not performed (FIG. 5B). As compared with the above, it is suppressed that the transport amount from the time t1 to the time t3 deviates from the scheduled transport amount. Thereby, the deviation from the target value of the transport distance determined by the transport amount from the time t1 to the time t3 becomes smaller than when the reset process is not performed. That is, compared with the case where the reset process is not performed, the deviation of the reversal position from the target position is reduced, and for example, the possibility of a paper jam accompanying the operation of the switching gate 40 is reduced.

  In the specific example shown in FIG. 5C, the reset process for setting the transport amount (including error) at time t1 to zero has been described. However, the reset process for setting only the transport amount error at time t1 to zero is performed. It may be broken.

  As mentioned above, although preferred embodiment of this invention was described, embodiment mentioned above is only a mere illustration in all the points, and does not limit the scope of the present invention. The present invention includes various modifications without departing from the essence thereof.

  DESCRIPTION OF SYMBOLS 10 Conveyance roller, 11 1st conveyance roller, 12 2nd conveyance roller, 14 Registration roller, 16 Discharge roller, 18 Discharge roller, 40 Switching gate, 100 Conveyance control apparatus.

Claims (5)

A transport roller for transporting the medium;
A motor that executes feedback control for correcting an error in the conveyance amount due to the conveyance and drives the conveyance roller;
A controller that controls conveyance of the medium after resetting an error in the conveyance amount corrected by the feedback control in response to the medium passing through a predetermined position;
Having
The conveyance control apparatus characterized by the above-mentioned. In the conveyance control device according to claim 1,
The motor starts driving the transport roller in accordance with control from the control unit, and executes the feedback control before the medium passes through the predetermined position to drive the transport roller. ,
The conveyance control apparatus characterized by the above-mentioned. In the conveyance control device according to claim 1 or 2,
A first transport roller for transporting the medium along the first transport path;
A first motor that performs the feedback control and drives the first transport roller;
A registration roller provided downstream of a predetermined position of the first transport path;
Have
The control unit executes the reset process in response to the medium passing through a predetermined position of the first transport path, and the medium passes through a predetermined position of the first transport path. The driving of the first conveying roller by the first motor is stopped after a predetermined time from
The conveyance control apparatus characterized by the above-mentioned. In the conveyance control device according to any one of claims 1 to 3,
A second transport roller that branches from the first transport path and transports the medium along a second transport path that leads to a path for reversing the front and back of the medium;
A second motor that executes the feedback control and drives the second transport roller;
Have
The control unit executes the reset process in response to the medium passing through a predetermined position of the second transport path, and the medium passes through a predetermined position of the second transport path. The driving of the second conveying roller by the second motor is stopped after a predetermined time from
The conveyance control apparatus characterized by the above-mentioned. In the conveyance control device according to claim 4,
The controller stops the driving of the second transport roller by the forward rotation of the second motor after the predetermined time, and then connects the first transport path and the second transport path. For reversing the front and back by controlling the gate for opening and closing the connection path to close the connection path and then rotating the second motor in the reverse direction to drive the second transport roller in the reverse direction. Transport the media to the path of
The conveyance control apparatus characterized by the above-mentioned.