JP2013018602A - Conveyance device, printing device, and conveyance method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyance devices or the like for conveying a sheet-like article stored in a roll, and capable of conveying media accurately in reverse conveyance and preventing the occurrence of a jam state.SOLUTION: In the conveyance device including: an upstream roller configured to convey a medium of a sheet form stored in a roll to a conveyance path; a downstream roller configured to supply the conveyed medium to a processing position; a roll rotating unit configured to rotate the medium stored in the roll to wind the medium; and a control unit configured to control the driving of them to convey the medium, the control unit executes drive control for conveying the medium to the upstream side by the driving of the upstream roller and the roll rotating unit to move a leading end of the medium to a predetermined position while a slack is generated between the upstream roller and the medium stored in the roll when winding the medium, and for conveying the medium to the downstream side by a predetermined amount by the driving of the upstream roller while the downstream roller presses the medium before stopping the driving of the roll rotating unit.

Description

  The present invention relates to a transport device for sheet-like materials stored in a roll shape, and more particularly to a transport device that can achieve accurate transport and prevention of jamming during reverse transport.

  2. Description of the Related Art Conventionally, an apparatus for processing a sheet-like medium (paper or the like) held in a roll shape such as a receipt printer is provided with an apparatus for transporting the medium to a processing position. The transport device is usually provided with an upstream roller that sends the medium held in a roll shape to the transport path and a downstream roller that supplies the sent medium to the processing position, and the medium is transported by driving these rollers. The

  In an apparatus such as a printer equipped with such a conveying apparatus, it is necessary to convey the medium in the reverse direction for the purpose of preparing for the next job or the purpose of maintenance of the apparatus after the job is finished. The medium is rotated around the roll axis to take up the medium to a predetermined position. This reverse conveyance operation has been conventionally performed in a state where the medium is pressed by the upstream roller, that is, in a state where there is a tension between the upstream roller and the roll-shaped medium.

  In addition, as a technique related to these, Patent Document 1 below proposes a method for correcting a paper misalignment of roll paper sent to a plotter. In this method, the roll paper is sent out onto the recording surface while applying tension, and then the rolled paper is wound around the roll paper while being loosened. Next, at the final stage of winding around the roll paper, the slack of the roll paper is removed by giving a time difference to the reverse rotation of the drive roller and the roll paper. These steps are repeated a plurality of times to eliminate paper misalignment.

JP-A-6-144664

  However, in the conventional reverse conveyance operation described above, since tension is acting on the medium between the upstream roller and the roll-shaped medium, if there is a deviation in the direction or position of the medium on the roll-shaped medium side, the deviation occurs. Will propagate to the upstream roller located on the downstream side and the downstream side thereof. In particular, this deviation easily occurs when the roll diameter is large. Since the deviation propagated downstream is promoted according to the propagation, if the deviation is large, there is a possibility that a jam state occurs in the structure of the conveyance path. Further, if the operation is finished in a shifted state, the processing is shifted at a stage where the processing is performed on the medium after transporting in the forward direction, and the processing quality is deteriorated.

  Further, in Patent Document 1, the stop position in the transport direction is not conscious, and the inertia of the roll paper when driving is stopped is not taken into consideration, so it is considered that there is a problem in the accuracy of the stop position. . In addition, as described above, there is a problem that the method of executing the predetermined operation a plurality of times cannot be corrected in a short time and the processing capability as the apparatus is reduced.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transport device for a sheet-like object stored in a roll shape, which can accurately transport at the time of reverse transport and prevent occurrence of a jammed state. It is.

  In order to achieve the above object, one aspect of the present invention provides an upstream roller for feeding a sheet-like processed medium held in a roll shape to a conveyance path, and the fed processed medium at a processing position. A downstream roller to be supplied, a roll rotating unit that rotates the processing medium held in the roll shape and winds up the processing medium, and drives the upstream roller, the downstream roller, and the roll rotating unit. And a control unit that controls and conveys the processing medium, and when the control unit winds up the processing medium and moves its tip to a predetermined position, the downstream roller is In a state where the processing medium is not pressed, and the slack of the processing medium occurs between the upstream roller and the processing medium held in the roll shape, the upstream roller and the roller By driving the rotary unit, the downstream medium is transported to the upstream side, the tip of the processed medium is moved to the predetermined position, and the downstream roller is moved before the driving of the roll rotary unit is stopped. In the state of pressing the medium to be processed, drive control is performed in which the medium to be processed is conveyed to the downstream side by a predetermined amount by driving the upstream roller.

  Furthermore, in the above-described invention, a preferable aspect is that the drive control by the control unit includes a first step in which the downstream roller does not press the medium to be processed, and the upstream roller after the first step. The drive is started and the medium to be processed is conveyed upstream at a first speed, and when the distance that the front end of the medium to be processed moves to the predetermined position is conveyed, the driving of the upstream roller is stopped. After the second step, after the second step, the third step in which the downstream roller presses the medium to be processed, and after the third step, start driving the upstream roller and A fourth step of conveying the medium to be processed downstream, and stopping the driving of the upstream roller when the predetermined amount of conveyance is completed; and the first step simultaneously with the start of driving of the upstream roller in the second step The speed of The roll rotating unit is driven at a slow winding speed, or at a winding speed equal to or lower than the first speed after a predetermined time has elapsed from the start of driving the upstream roller in the second step, and the upstream roller And a fifth step of stopping the driving of the roll rotating unit when the slack generated between the medium to be processed held in a roll is eliminated.

  Furthermore, in the above-mentioned invention, the preferable aspect further includes a guide device that is provided between the upstream roller and the downstream roller and defines a position in the width direction of the medium to be processed. To do.

  Furthermore, in the above invention, a preferable aspect is that the drive control of the upstream roller and the roll rotating unit is performed based on detection values of encoders provided in the upstream roller and the roll rotating unit, respectively. And

  In order to achieve the above object, another aspect of the present invention is to provide a printing apparatus that includes any one of the above-described transport devices and that performs printing on the target medium at the processing position.

  In order to achieve the above object, still another aspect of the present invention provides an upstream roller for feeding a sheet-like processed medium held in a roll shape to a conveyance path, and a processing position for the fed processed medium. A downstream roller supplied to the roll, a roll rotating unit that rotates the medium to be processed held in the roll shape and winds up the processed medium, and driving the upstream roller, the downstream roller, and the roll rotating unit And a control unit that controls the medium to be transported, and the control unit winds the medium to be processed and moves the tip of the medium to a predetermined position. In a state where the side roller does not press the medium to be processed, the upstream side in a state in which the slack of the medium to be processed occurs between the upstream roller and the medium to be processed held in the roll shape. By driving the roller and the roll rotation unit, the downstream side of the processing medium is transported to the upstream side, the tip of the processing medium is moved to the predetermined position, and the driving of the roll rotation unit is stopped before the downstream side is stopped. In a state in which the roller presses the target medium, drive control is performed in which the target medium is conveyed to the downstream side by a predetermined amount by driving the upstream roller.

  Further objects and features of the present invention will become apparent from the embodiments of the invention described below.

It is a schematic block diagram concerning the example of an embodiment of a printing device provided with a conveyance device to which the present invention is applied. 3 is a schematic perspective view of a paper guide 35. FIG. It is the flowchart which illustrated the procedure of the process which the conveyance control part 22 performs at the time of reverse conveyance operation | movement. It is a figure for demonstrating the state in each step at the time of reverse conveyance operation | movement. FIG. 6 is a diagram for explaining stop of driving of a roll rotation unit 36.

  Embodiments of the present invention will be described below with reference to the drawings. However, such an embodiment does not limit the technical scope of the present invention. In the drawings, the same or similar elements are denoted by the same reference numerals or reference symbols.

  FIG. 1 is a schematic configuration diagram according to an embodiment of a printing apparatus including a transport device to which the present invention is applied. The printer 2 shown in FIG. 1 is a printing apparatus according to the present embodiment, and the printing apparatus uses a paper 26 held in a roll shape as a paper feed roller 29 (upstream roller) and a conveyance roller 30 (downstream roller). ) To the printing position to execute the printing process. In reverse conveyance performed between jobs, for example, when the paper 26 is rolled up to a predetermined position as the roll paper 25 by driving the roll rotation unit 36, In a state where the paper 26 is slackened between the paper feed roller 29 and the roll rotation unit 36 (roll paper 25), the paper 26 is reversely conveyed by driving the paper feed roller 29 and the roll rotation unit 36, and then Before the driving of the roll rotation unit 36 stops, the paper feed roller 29 is driven in the forward direction while the paper 26 is pressed by the transport roller 30 and its driven roller 28B. Conveying the paper 26 by a predetermined distance by. As a result, even when the paper 26 is displaced on the roll paper 25 side during winding, the slack does not easily propagate to the downstream side due to the slack, and the feed roller 29 is transported in the forward direction. Since the slack is also generated between the roller 30 and the conveying roller 30, the slack absorbs the excessive amount of paper 26 taken up due to the control time and inertia when the roll rotation unit 36 finishes winding the paper 26. can do. Therefore, the stop position can be accurately maintained, and the deviation of the downstream paper 26 can be suppressed to be small, so that accurate reverse conveyance is possible.

  As shown in FIG. 1, the printer 2 is a device that executes a printing process in response to an instruction from a host device 1 such as a computer. Here, as an example, the printer 2 uses a roll paper 25 as a paper 26. 26 is a printing apparatus that continuously performs printing while transporting 26.

  In FIG. 1, the schematic configuration of the printer 2 is schematically illustrated. However, the printer 2 includes a printing system that controls printing contents and executes a printing process on the paper 26 and a transport system that transports the paper 26.

  The printing system is provided with a printing control unit 21, which receives a printing instruction from the host device 1, issues a printing command to the head unit 23 in accordance with the instruction, and conveys the conveyance control unit 22. The paper 26 is requested to be conveyed. The head unit 23 executes a printing process on the paper 26 that moves between the head unit 23 and the platen 24 at a predetermined speed in accordance with the print command.

  In the transport system, as shown in FIG. 1, the paper 26 held as the roll paper 25 is continuously transported in the forward direction (downstream direction) along the transport path 33 at the printing medium storage (holding) location, and printing is performed. An operation of cutting the completed portion with the cutter 34 and discharging the printer 2 from the printer 2 through the paper discharge roller 32 is executed. Further, after the transport operation, for example, a reverse transport operation in the reverse direction (upstream direction) is also performed so that the leading edge of the paper 26 comes to a predetermined position (cue position) upstream of the head portion 23.

  The transport system includes a paper feed roller 29 (upstream roller) and a transport roller 30 (downstream roller) driven by corresponding motors (27A and 27B). On both the rollers, driven rollers (28A and 28B) are arranged at positions facing each other with the paper 26 interposed therebetween. Each driven roller is movable in the direction perpendicular to the surface of the paper 26 and can take two positions, upper and lower. At a lower position in contact with the paper 26, a vertical downward force is applied to the surface of the paper 26, and the paper 26 is sandwiched by the rollers (29, 30) and the force of the paper 26 is perpendicular to the surface of the paper 26. Is holding down. This state is referred to herein as a nip state. Further, at the upper position away from the paper 26, the force pressing the paper 26 does not act, and this state is referred to as a release state.

  The paper feed roller 29 has a function of supplying the paper 26 held as the roll paper 25 to the transport path 33, rotates by the torque of the motor 27A transmitted through the speed reducer, and presses the paper 26 together with the driven roller 28A. The paper 26 is moved by the frictional force between the two. The roller is also used when the paper 26 is reversely conveyed.

  The transport roller 30 has a function of transporting the paper 26 supplied by the paper feed roller 29 to the printing position, that is, to the position of the head unit 23, and is rotated by the torque of the motor 27B transmitted through the speed reducer. The paper 26 is moved by the frictional force between the paper 26 pressed together with the driven roller 28B.

  The paper feed roller 29 and the transport roller 30 are provided with encoders 31A and 31B, respectively, and the rotation of both rollers detected by them is notified to the transport control unit 22. Further, the driven roller 28A of the paper feed roller 29 is also provided with an encoder 31D, whereby the rotation of the driven roller 28A is similarly detected and notified to the conveyance control unit 22. The encoder 31D is used during reverse conveyance.

  A paper guide 35 is provided between the paper feed roller 29 and the transport roller 30. FIG. 2 is a schematic perspective view of the paper guide 35. As shown in FIG. 2, the paper guide 35 is configured by a plate-like member disposed on both sides of the paper 26 in the width direction, and is provided so as to sandwich the paper with a predetermined gap from the paper 26. As a result, the position in the width direction of the sheet 26 is defined, and the sheet 26 is prevented from shifting by a predetermined amount or more in the width direction.

  Next, a roll rotation unit 36 is provided in the transport system. The roll rotation unit 36 rotates the paper 26 held as the roll paper 25 and performs an operation of winding the fed paper 26. The roll rotating unit 36 is driven by a motor 27C, and passes through the core of the roll paper 25 rotated by the speed reducer (drive wheel train) that transmits the torque of the motor 27C and the torque transmitted through the speed reducer. Consists of shaft rods.

  The roll rotation unit 36 is also provided with an encoder 31 </ b> C, and the conveyance control unit 22 is notified of the rotation of the roll paper 25 detected by the encoder 31 </ b> C.

  Next, the conveyance control unit 22 shown in FIG. 1 is a part that controls the conveyance system, and controls the conveyance operation of the paper 26 based on an instruction from the print control unit 21. In particular, the drive and stop of the paper feed roller 29, the transport roller 30, and the roll rotating unit 36 are controlled so that the paper 26 is favorably transported in the forward direction and the reverse direction. Among these, the reverse conveyance control has a feature of the printer 2, and the specific contents thereof will be described later.

  Although not shown, the transport control unit 22 is configured by a CPU, a ROM, a RAM, an NVRAM (nonvolatile memory), and the like, and the processing executed by the transport control unit 22 is mainly a program stored in the ROM. It is executed by the CPU operating according to the above.

  Each data necessary for processing is temporarily stored in the RAM, and detection values of the encoders 31 necessary for driving / stopping control of the paper feed roller 29, the transport roller 30, the roll rotating unit 36, and the like are stored. Is done.

  In addition, the said conveyance system containing the paper feed roller 29, the conveyance roller 30, the roll rotation part 36, and the conveyance control part 22 corresponds to the conveying apparatus of this invention.

  The printer 2 having the above-described configuration is characterized by the conveyance control of the paper 26, and the specific contents thereof will be described below.

  As described above, since the printer 2 performs the printing process on the paper 26 that is conveyed at a predetermined speed, the conveyance system performs a conveying operation in the forward direction during the printing process. At this time, when the printing process is started, the conveyance control unit 22 controls the conveyance speed of the paper feed roller 29 and the conveyance roller 30 so as to quickly reach the predetermined speed, and sets the conveyance speed until the printing process is completed. Maintain and stop both rollers when the printing process is finished.

  In addition, after the cutting process of the paper 26 by the cutter 34 or during maintenance of the printing system (such as flushing the nozzles provided in the head unit 23), the operation of returning the leading edge of the paper 26 to a predetermined print standby position (cueing position). In such a case, the transport system performs a transport operation (winding operation) in the reverse direction. Hereinafter, the reverse conveying operation will be specifically described.

  FIG. 3 is a flowchart illustrating a procedure of processing executed by the transport control unit 22 during the reverse transport operation. First, when the conveyance control unit 22 receives a reverse conveyance start instruction for the sheet from the print control unit 21 (step S1), the driven roller 28B of the conveyance roller 30 is set to the above-described position, that is, released to the sheet 26. The pressing force is released (step S2).

  FIG. 4 is a diagram for explaining a state in each step during the reverse conveyance operation. FIG. 4A shows a state after the release of the transport roller 30. This state is, for example, immediately after the conveyance in the forward direction, the paper 26 is on the conveyance path without slack, and the leading end thereof is located downstream of the head portion 23 (printing position).

  Next, the conveyance control unit 22 determines the speed and conveyance amount of the paper feed roller 29 and the roll rotation unit 36 when performing reverse conveyance (step S3). The carry amount is determined based on the leading end position of the paper 26 before the operation. In the case of the operation after cutting described above, the distance from the cutter 34 to the print standby position is the transport amount. Further, the transport speed by the paper feed roller 29 is set to a predetermined value (Vk) for reverse transport, and the transport speed by the roll rotating unit 36 is determined by the paper feed roller 29 from the value of the diameter of the roll paper 25 at that time. A speed (Vr ≦ Vk) equal to or lower than the transport speed is determined.

  Thereafter, the conveyance control unit 22 starts driving the paper feed roller 29 (step S4). The driving of the roll rotation unit 36 may be started simultaneously at this time, or may be started after a predetermined time has elapsed. In the former case, it is necessary that the conveyance speed (Vr) by the roll rotating unit 36 is determined to be a considerably smaller value than the conveyance speed (Vk) by the paper feed roller 29, and this start timing is combined with the above speed. The sheet 26 can be loosened between the paper feed roller 29 and the roll paper 25 during reverse conveyance, and the amount of looseness is set within a predetermined range. .

  In this way, when driving of the paper feed roller 29 and the roll rotating unit 36 is started, the conveyance control unit 22 thereafter detects the encoders 31A and 31C described above so as to achieve the determined conveyance speeds. PID control is performed based on the value.

  FIG. 4B shows a state during reverse conveyance. As described above, since there is a difference in the conveyance speed and the drive start timing between the paper feed roller 29 and the roll rotating unit 36, the conveyance of the paper feed roller 29 precedes and as shown in the drawing, the paper feed roller 29 and the roll paper 25 The slack of the paper 26 occurs between the two. Further, the leading end position of the paper 26 is approaching the print standby position.

  Thereafter, the conveyance in the reverse direction proceeds, and when the conveyance amount by the paper feed roller 29 reaches the determined conveyance amount, the conveyance control unit 22 stops the paper feed roller 29 (step S5). Immediately, the conveyance control unit 22 nips the conveyance roller 30 (step S6). That is, the driven roller 28 </ b> B is moved to the lower position, and a nip state in which the paper 26 is pressed is set.

  FIG. 4C shows a state after the nip. At this point, since the reverse conveyance by the paper feed roller 29 is completed, the leading edge of the paper 26 has reached the print standby position, and the paper feed roller 29 is stopped. Further, since the conveyance (winding) by the roll rotation unit 36 is delayed as compared with the paper feed roller 29 as described above, the roll rotation unit 36 continues to be driven at this time, and the above-described slack is caused by the paper feed. It is the maximum when the roller 29 stops.

  Immediately after the nip is completed, the conveyance control unit 22 drives the paper feed roller 29 in the forward direction, and conveys the paper 26 by a predetermined distance in the forward direction (step S7). FIG. 4D shows this state. Here, as described above, since the paper 26 is transported in the forward direction from the paper feed roller 29 with the transport roller 30 being nipped, that is, with the paper 26 being pressed, the leading edge of the paper 26 moves. In other words, the paper 26 can be slackened between the paper feed roller 29 and the transport roller 30. Note that during the conveyance in the forward direction, the winding by the roll rotation unit 36 is not yet completed, but the slack between the paper feed roller 29 and the roll paper 25 continues to decrease.

  When the predetermined amount of forward conveyance is completed, the conveyance control unit 22 stops the paper feed roller 29.

  Thereafter, the conveyance control unit 22 monitors the encoder 31 </ b> D provided on the driven roller 28 </ b> A of the paper feed roller 29 to detect rotation. At the end of the step S7, the driving of the paper feed roller 29 and the transport roller 30 is stopped, and the movement of the paper 26 in the paper feed roller 29 portion has been stopped. Therefore, the rotation of the encoder 31D at this time is stopped. The detection means that the paper 26 has been pulled by the winding drive of the roll rotation unit 36 and has moved upstream. In other words, it means that the slack between the paper feed roller 29 and the roll paper 25 is eliminated.

  When the conveyance control unit 22 confirms the movement of the sheet 26 (step S8), since the winding by the roll rotation unit 36 has been completed, the conveyance control unit 22 immediately stops driving the roll rotation unit 36 (step S9). Specifically, the duty value (Duty value, current supply value) of the motor 27C is immediately made zero. More specifically, for example, after the rotation is detected by the encoder 31D, the duty value is set to zero after one encoder pulse (EP). Note that the rotation detection by the encoder 31D reliably detects that the paper 26 has been pulled and moved from the roll paper 25 side, so that the rotation is detected a predetermined number of times. It is preferable to do.

  FIG. 5 is a diagram for explaining the drive stop of the roll rotating unit 36. FIG. 5 is a graph illustrating the transport speed (V) by the roll rotating unit 36 over time (T), and shows a case where the rotation is detected by the encoder 31D at time Ts. The curve A is a speed curve that is generally performed in the past. In this case, the PID control described above is appropriately performed so as to achieve the speed shown in the curve, and finally the speed becomes zero. .

  On the other hand, a curve B is a case where the duty value of the motor 27C is immediately set to zero as described above, and obviously, this can stop the rotation of the roll rotating unit 36 in a short time and with a short moving distance. In the conventional control, the actual speed may fluctuate up and down from the curve A due to environmental fluctuations such as inertia of the roll paper 25. In this case, the time and the transport distance are further increased.

  FIG. 4E shows a state at the time when the roll rotating unit 36 stops, that is, a state at the time when the reverse conveying operation is finished. Here, as described above, since the winding by the roll rotation unit 36 has been completed, the slack between the paper feed roller 29 and the roll paper 25 is eliminated, and the conveyance in the forward direction is possible. Further, as described above, the sheet 26 moves upstream due to the control time and the inertia of the roll paper 25 until the roll rotation unit 36 actually stops after the loosening is eliminated. It is absorbed by the slack between the paper feed roller 29 and the transport roller 30. Accordingly, the amount of looseness is reduced. However, since the slack is generated so that the slack does not disappear, the leading edge of the paper 26 is not pulled, and the position is maintained at the print standby position.

  In this way, the reverse transport operation in response to the instruction ends, but the transport control unit 22 stores the transport amount in the reverse direction of the paper 26 after the end of step S7 in the RAM or the NVRAM (step S10). That is, how much the slack between the paper feed roller 29 and the transport roller 30 generated in step S7 is reduced, in other words, how much slack is between the paper feed roller 29 and the transport roller 30 is stored. Keep it. This value is used for the next transport process in the positive direction. For example, when the necessary amount of slack between the paper feed roller 29 and the transport roller 30 is insufficient during the next transport, the start timing of the paper feed roller 29 and the transport roller 30 is shifted so as to compensate for the shortage.

  A series of reverse conveyance control is completed as described above.

  As described above, in the transport system of the printer 2 according to the present embodiment, slack is generated between the paper feed roller 29 and the roll paper 25 in the reverse transport operation of winding the paper 26 to the roll paper 25 side. Since the paper 26 is wound in the state, even if a deviation occurs in the width direction position or direction of the paper 26 on the roll paper 25 side, the deviation hardly propagates to the upstream side. There is no possibility that the paper 26 will be greatly displaced. Accordingly, it is possible to avoid jamming due to strong contact with the structure of the conveyance path 33 such as the paper guide 35, and the paper 26 can be supplied to the printing position in a good state with little deviation. Can be improved.

  Further, since the slack of the paper 26 is generated between the paper feed roller 29 and the transport roller 30 after the reverse conveyance by the paper feed roller 29, the roll rotation unit 36 moves from the timing to stop until it actually stops. Thus, the slackness can be absorbed by the slack, the leading edge of the paper 26 can be held at the correct position, and accurate reverse conveyance can be performed in a short time.

  Further, as described above, since the roll rotating unit 36 can be stopped immediately, the distance that the roll rotating unit 36 moves until it is actually stopped can be shortened. The slack between the rollers 30 can be set small. Thereby, it is not necessary to increase the size of the structure of the transport path 33 due to the slack, and the time required for the reverse transport operation can be kept short, so that the throughput of the printer 2 can be improved.

  Further, since the position in the width direction of the paper 26 can be defined by the paper guide 35, further accurate conveyance is possible.

  Further, the stop timing of the roll rotating unit 36 can be detected with a relatively easy configuration using an encoder.

  In this embodiment, the print medium is paper, but the present invention is not limited to this as long as it is a sheet-like medium.

  In this embodiment, the transport device is provided in the printer. However, the transport device to which the present invention is applied is provided in a device that performs various processes such as machining, laser processing, and liquid jet processing on the sheet-like material. Can be used.

  The protection scope of the present invention is not limited to the above-described embodiment, but covers the invention described in the claims and equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 Host apparatus, 2 Printer, 21 Print control part, 22 Transport control part, 23 Head part, 24 Platen, 25 Roll paper, 26 Paper, 27A, B, C motor, 28A, B Drive roller, 29 Paper feed roller, 30 Conveyance roller, 31A, B, C, D Encoder, 32 Discharge roller, 33 Conveyance path, 34 Cutter, 35 Paper guide, 36 Roll rotating part

Claims (6)

An upstream roller that feeds a sheet-like processed medium held in a roll shape to a conveyance path, a downstream roller that supplies the fed processed medium to a processing position, and the processed medium held in the roll shape A roll rotating unit that rotates the roll to wind up the processing medium, and a control unit that controls the driving of the upstream roller, the downstream roller, and the roll rotating unit to transport the processing medium. A device,
When the control unit winds up the medium to be processed and moves its tip to a predetermined position, the control unit keeps the downstream roller from pressing the medium to be processed and is held in a roll shape with the upstream roller. In a state where the slack of the processing medium occurs between the processing medium and the processing medium, the upstream medium and the roll rotating unit are driven to convey the processing medium to the upstream side, thereby leading the leading edge of the processing medium. Is moved to the predetermined position, and before the roll rotating unit stops driving, the downstream roller is pressed against the medium to be processed by driving the upstream roller. A conveying device characterized in that a predetermined amount is conveyed to the vehicle and drive control is executed. In claim 1,
The drive control by the control unit is
A first step in which the downstream roller does not press the medium to be processed;
After the first step, driving of the upstream roller is started to transport the medium to be processed to the upstream side at a first speed, and the distance by which the tip of the medium to be processed moves to the predetermined position is conveyed. A second step of stopping the driving of the upstream roller at the time,
After the second step, a third step in which the downstream roller presses the medium to be processed;
After the third step, the fourth step starts driving the upstream roller to convey the medium to be processed downstream, and stops driving the upstream roller when the predetermined amount of conveyance is completed. When,
At the same time as the start of driving the upstream roller in the second step, the winding speed is slower than the first speed, or less than the first speed after a predetermined time has elapsed from the start of driving the upstream roller in the second step. The roll rotating unit is driven at a winding speed of 5 mm, and when the slack generated between the upstream roller and the medium to be processed held in a roll shape disappears, the driving of the roll rotating unit is stopped. And a fifth process. In claim 1 or 2, further,
A conveying device comprising a guide device provided between the upstream roller and the downstream roller and defining a position in the width direction of the medium to be processed. In any one of Claims 1 thru | or 3,
Drive control of the said upstream roller and the said roll rotation part is performed based on the detected value of the encoder respectively provided in the said upstream roller and the said roll rotation part. The conveying apparatus characterized by the above-mentioned.   A printing apparatus comprising the transport device according to claim 1, wherein the printing apparatus executes printing on the medium to be processed at the processing position. An upstream roller that feeds a sheet-like processed medium held in a roll shape to a conveyance path, a downstream roller that supplies the fed processed medium to a processing position, and the processed medium held in the roll shape A roll rotating unit that rotates the roll to wind up the processing medium, and a control unit that controls the driving of the upstream roller, the downstream roller, and the roll rotating unit to transport the processing medium. A conveying method in the apparatus,
When the control unit winds up the medium to be processed and moves its tip to a predetermined position, the downstream roller does not press the medium to be processed and is held in a roll shape with the upstream roller. In a state where the slack of the processing medium occurs between the processing medium and the processing medium, the upstream medium and the roll rotating unit are driven to convey the processing medium to the upstream side, thereby leading the leading edge of the processing medium. Is moved to the predetermined position, and before the roll rotating unit stops driving, the downstream roller is pressed against the medium to be processed by driving the upstream roller. A conveying method comprising carrying out a drive control to convey a predetermined amount to the vehicle.

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