Printing device and printing device control method

Abstract

To provide a printer preventing a roll sheet from rattling due to tension force of a recording paper pulled out of the roll sheet during printing.SOLUTION: A printer comprises a transportation roller for pulling a recording paper out of a roll sheet and conveying it, a storage part for storing a specified speed, a specified distance and a maximum speed of a transportation of the recording paper by the transportation roller, and a control part, and the control part executes a first acceleration transportation processing for accelerating the transportation of the recording paper by the transportation roller after that the transportation of the recording paper by the transportation roller starts until the transportation speed of the recording paper reaches at the specified speed, executes a constant speed transportation processing for transporting the recording paper to the transportation roller at the specified speed for the specified distance after executing the first acceleration transportation processing and executes a second acceleration transportation processing for accelerating the transportation of the recording paper by the transportation roller after executing the constant speed transportation processing until the transportation speed of the recording paper reaches at the maximum speed.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a printing device and a method for controlling a printing device. [Background technology]

[0002] In the thermal printer described in Patent Document 1, the platen roller rotates forward to transport recording paper fed from a roll of paper to an exit. The platen roller accelerates the transport from the start of transport to the maximum transport speed, and then maintains the maximum transport speed while transporting the recording paper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-90339 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the platen roller continues to accelerate from the start of paper transport up to the maximum transport speed, the tension of the paper pulled out from the roll paper may cause the roll paper to flap inside the storage section. [Means for solving the problem]

[0005] One aspect of the printing device according to the present invention is a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a designated distance, and a maximum speed for conveying the recording paper by the conveyance roller; a control unit that controls the transport speed of the recording paper by the transport roller, The control unit executes a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed in which the transport of the recording paper by the transport roller is accelerated until the transport speed of the recording paper reaches the maximum speed.

[0006] One aspect of the printing device control method according to the present invention comprises: a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a maximum speed, and a designated distance for conveying the recording paper by the conveyance roller, executes a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed in which the transport of the recording paper by the transport roller is accelerated until the transport speed of the recording paper reaches the maximum speed. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a printing device. [Figure 2] FIG. 2 is a diagram illustrating an example of the internal structure of a printing device. [Figure 3] FIG. 2 is a block diagram illustrating an example of an electrical configuration of the printing apparatus. [Figure 4] FIG. 10 is a diagram illustrating an example of a conveying speed table. [Figure 5] FIG. 10 is a diagram illustrating an example of an acceleration table. [Figure 6] FIG. 10 is a diagram illustrating an example of a deceleration table. [Figure 7] 10A and 10B are diagrams illustrating problems in conventional control of the transport speed of thermal paper. [Figure 8] FIG. 4 is a flowchart illustrating an example of the procedure of a control method for the printing device according to the first embodiment. [Figure 9] FIG. 10 is a diagram illustrating an example of the relationship between a conveying distance and a conveying speed. [Figure 10] 10A and 10B are diagrams illustrating an example of a change in state of the thermal paper when it is pulled out from the medium. [Figure 11] FIG. 10 is a flowchart illustrating an example of the procedure of a control method for a printing device according to a second embodiment. [Figure 12] 10A and 10B are diagrams illustrating an example of a change in state of the thermal paper when it is pulled out from the medium. [Figure 13] FIG. 11 is a flowchart illustrating an example of the procedure of a control method for a printing device according to a third embodiment. [Figure 14] 10A and 10B are diagrams illustrating an example of a change in state of the thermal paper when it is pulled out from the medium. [Figure 15] FIG. 13 is a flowchart showing an example of the procedure of a control method for a printing device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Preferred embodiments of the present invention will be described below with reference to the drawings. The drawings used are for the convenience of explanation. Note that the embodiments described below do not unduly limit the content of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential components of the present invention.

[0009] Directions in the drawings will be explained using a three-dimensional coordinate system. For convenience of explanation, the positive direction of the Z axis will be referred to as the upward direction or simply "up," the negative direction as the downward direction or simply "down," the positive direction of the X axis will be referred to as the rightward direction or simply "right," the negative direction as the leftward direction or simply "left," and the positive direction of the Y axis will be referred to as the forward direction or simply "front," and the negative direction as the backward direction or simply "back."

[0010] 1. First embodiment The schematic configuration of the printing device 1 will be described with reference to Figures 1, 2, and 3. Figure 1 is a perspective view of the printing device 1 according to this embodiment. Figure 2 is a diagram schematically illustrating an example of the internal structure of the printing device 1, and is a side view of the inside of the printing device 1. Figure 3 is a diagram illustrating an example of the electrical configuration of the printing device 1.

[0011] The printing device 1 is, for example, a thermal printer. As shown in Fig. 1, the printing device 1 has a main body case 10 that is shaped like a rectangular parallelepiped overall, excluding bumps and recesses such as buttons.

[0012] As shown in Figure 2, the main body case 10 is provided inside with a medium storage section 215 that stores the medium P. The medium P is a roll of thermal paper 26 wound in a roll as recording paper. When the access door 15 is closed, the thermal paper 26 that has been pulled out of the medium P passes through a transport path formed between the access door 15 and the main body case 10 and is discharged from the medium discharge opening 11.

[0013] The display unit 13 includes, for example, a plurality of LEDs. The display unit 13 is electrically connected to the control unit 101 (described later) and is controlled by the control unit 101. The display unit 13 displays information about the status of the printing device 1, for example, by flashing, lighting, or turning off the LEDs. The display unit 13 may also be a liquid crystal display device.

[0014] Furthermore, the display unit 13 may display, for example, information regarding the communication status, information urging the user to replenish the medium P, etc. Since the display unit 13 has the role of informing the user of the status of the printing device 1, it is preferable that the display unit 13 be provided in a position that is easily visible to the user.

[0015] The opening and closing door 15 constitutes one surface of the main body case 10, and is connected to the front of the main body case 10 so as to be able to open and close with a hinge 216 as a rotation axis. For example, the opening and closing door 15 constitutes the front surface of the main body case 10.

[0016] As shown in FIG. 2, a transport roller 112b is provided inside the main body case 10, located on the back side of the opening / closing door 15. The transport roller 112b is disposed opposite the print head 113 provided inside the main body case 10. Although not shown in FIG. 2, the rotation of the DC motor 112a is transmitted to the transport roller 112b by a gear 112c, causing the transport roller 112b to rotate. A disk 213 with multiple slits formed on its periphery is fixed to the transport roller 112b. The central axis of the disk 213 coincides with the rotation axis of the transport roller 112b, and the disk 213 also rotates as the transport roller 112b rotates. A photosensor 214 is fixed in a position opposite the periphery of the disk 213, and the position of the photosensor 214 does not change even when the transport roller 112b rotates. Each time a slit provided on the periphery of disc 213 passes the position of photosensor 214, the amount of light received by photosensor 214 changes in a binary manner. Therefore, when transport roller 112b rotates, photosensor 214 generates a detection signal including a large number of pulses. Disc 213 and photosensor 214 form encoder 117. Note that encoder 117 may be attached to the rotation shaft of DC motor 112a or the rotation shaft of gear 112c instead of the rotation shaft of transport roller 112b.

[0017] With the thermal paper 26 sandwiched between the transport roller 112b and the print head 113, the thermal paper 26 is transported by the rotation of the transport roller 112b, and the print head 113 prints on the printing surface of the thermal paper 26.

[0018] The medium ejection port 11, the display unit 13, the power switch 31, and the opening / closing lever 32 are arranged on the same surface of the main body case 10.

[0019] It is preferable that medium ejection port 11 is provided in a position that is easily visible to the user, similar to display unit 13. Furthermore, it is more preferable that medium ejection port 11 is provided near display unit 13 so that the user can see medium ejection port 11 and display unit 13 at the same time. Specifically, it is preferable that medium ejection port 11 and display unit 13 are provided side by side.

[0020] The power switch 31 is a switch for turning on and off the power of the printing device 1. The printing device 1 is connected to a commercial AC power source via a power cable (not shown) and receives power. When the power is on, the printing device 1 prints on thermal paper 26 and communicates with external devices connected to the printing device 1.

[0021] The opening / closing lever 32 is a lever used when opening and closing the opening / closing door 15. The opening / closing door 15 faces a medium storage section 215 that stores medium P, and the user operates the opening / closing lever 32 to open the opening / closing door 15 and store the medium P in the medium storage section 215 provided in the main body case 10. The opening / closing door 15 closes the medium storage section 215.

[0022] The main body case 10 has a cable cutout 16 on the right or left side for pulling out various cables such as a power cable and a USB cable.

[0023] Inside the printing device 1, there are a transport roller 112b, a print head 113, a movable blade 114c, a fixed blade 114b, a paper detection sensor 115, a paper-out detection sensor 116, a near-end detector 118, an open / close sensor 119, and a medium P on which thermal paper 26 is wound.

[0024] The transport roller 112b is a mechanical component that feeds or reverses the thermal paper 26. Specifically, the thermal paper 26 is held between the transport roller 112b and the print head 113, and the rotation of the transport roller 112b feeds or reverses the thermal paper 26.

[0025] In this embodiment, paper feeding refers to transporting the thermal paper 26 in direction L1, and reverse feeding refers to transporting the thermal paper 26 in direction L2. Here, direction L1 is the direction from upstream to downstream in the transport direction of the thermal paper 26, and direction L2 is the direction from downstream to upstream in the transport direction of the thermal paper 26. Transporting the thermal paper 26 in direction L2 is also referred to as backfeeding.

[0026] The print head 113 is a component that prints on the medium P. One example of the print head 113 is a thermal head. The print head 113 has multiple heating elements 113a arranged in a direction that intersects with the transport direction of the thermal paper 26. Specifically, the multiple heating elements 113a are arranged in a line in a direction perpendicular to the transport direction of the thermal paper 26 on the underside of the print head 113 that contacts the thermal paper 26. The multiple heating elements 113a generate heat when powered on, and dots are formed on the printing surface of the thermal paper 26 when heat is applied from the print head 113 to the thermal paper 26. In this way, the print head 113 prints on the thermal paper 26.

[0027] The movable blade 114c and fixed blade 114b are part of the cutting unit 114 that cuts the printed thermal paper 26. The movable blade 114c performs a partial cut, leaving a portion of the thermal paper 26 uncut. This allows the user to cut off the printed thermal paper 26 in small pieces. The movable blade 114c may also be configured to perform a full cut, completely cutting the printed thermal paper 26.

[0028] The movable blade 114c is movable in the vertical direction in Figure 2. When the movable blade 114c moves upward, the thermal paper 26 is sandwiched between the fixed blade 114b and the movable blade 114c, and is partially cut to form a slip, for example. The slip is then discharged from the medium discharge port 11.

[0029] Furthermore, a paper detection sensor 115 is provided near the medium exit 11. The paper detection sensor 115 detects the presence or absence of thermal paper 26 near the medium exit 11. In other words, the paper detection sensor 115 is provided downstream of the cutting unit 114 in the transport direction of the thermal paper 26, and is a sensor that detects the presence or absence of a slip connected to the thermal paper 26 via an uncut portion. For example, if the paper detection sensor 115 detects the presence of thermal paper 26 a predetermined time after printing is completed, the control unit 101 may be configured to display on the display unit 13 that a slip remains uncut, or to notify the user by other means. The paper detection sensor 115 may also be referred to as a pickup sensor.

[0030] The paper-out detection sensor 116 is a sensor that detects whether or not the thermal paper 26 is present, and is provided upstream of the print head 113 in the direction in which the thermal paper 26 is transported.

[0031] The near-end detector 118 is located near the medium P stored in the medium storage unit 215 and detects a near-end state of the medium P. The near-end state is a state in which the diameter of the medium P is smaller than a predetermined value, meaning that the medium P is close to running out of paper. For example, the near-end detector 118 may be a mechanical switch that turns on or off in conjunction with the diameter of the medium P by contacting the side of the medium P when the diameter of the medium P is larger than the predetermined value, as shown by the solid line, and not contacting the side of the medium P when the diameter of the medium P is smaller than the predetermined value, as shown by the dashed line. Alternatively, the near-end detector 118 may be a photosensor that changes the amount of light it receives in a binary manner depending on whether the diameter of the medium P is larger or smaller than the predetermined value.

[0032] For example, when the paper-out detection sensor 116 detects that there is no thermal paper 26, the control unit 101 may be configured to display on the display unit 13 that the medium P is out of paper, or to notify the user by other means. Also, when the near-end detector 118 detects that the medium P is near the end, the control unit 101 may be configured to display on the display unit 13 that the medium P is approaching the end of paper, or to notify the user by other means. This configuration allows the user to smoothly replace the medium P that is wound with thermal paper 26 in a roll.

[0033] The opening / closing sensor 119 is provided near the opening / closing door 15 and is a sensor that detects the opening / closing of the opening / closing door 15. For example, the opening / closing sensor 119 may be a mechanical switch that turns on or off in conjunction with the opening or closing of the opening / closing door 15, or may be a photosensor that changes the amount of light it receives in a binary manner in conjunction with the opening or closing of the opening / closing door 15. For example, when the opening / closing sensor 119 detects that the opening / closing door 15 is open, the control unit 101 may be configured to display that the opening / closing door 15 is open on the display unit 13, or to notify the user by other means.

[0034] In this embodiment, the medium P is exemplified as a roll of thermal paper 26, but the medium P is not limited to thermal paper 26 and may also be a roll of thermal label paper or the like.

[0035] The functional configuration of the printing device 1 will be described with reference to Fig. 3. As shown in Fig. 3, the printing device 1 includes a control unit 101, a communication unit 102, a storage unit 103, a printing unit 104, a detection unit 105, a display unit 13, a conveying unit 112, and a cutting unit 114.

[0036] The control unit 101 includes a CPU (Central Processing Unit) that executes various controls on each unit in the printing device 1. The CPU is also called a processor.

[0037] The communication unit 102 is, for example, an interface that performs wired or wireless communication with an external device connected to the printing device 1. For example, the control unit 101 receives print data for executing printing from an external device connected to the printing device 1 via the communication unit 102. Also, for example, the control unit 101 transmits various types of information to the external device via the communication unit 102.

[0038] The storage unit 103 includes a rewritable nonvolatile memory such as a flash ROM (Read Only Memory), and the nonvolatile memory can store firmware, which is a program, and predetermined information including information related to the control of each unit. The storage unit 103 also includes RAM (Random Access Memory), which is a volatile memory used by the control unit 101 as a work area. The nonvolatile memory stores various types of information, such as a conveying speed table 111 and conveying specification information 120. The firmware and various types of information stored in the nonvolatile memory are transferred from the nonvolatile memory to the RAM when the printing device 1 is powered on. The control unit 101 then executes the firmware stored in the RAM and controls various parts using the various types of data stored in the RAM.

[0039] The printing unit 104 receives instructions from the control unit 101 and executes printing on the thermal paper 26. The printing unit 104 includes, for example, a print head 113. Based on the print data, the control unit 101 controls whether to energize each of the multiple heating elements 113a of the print head 113 for each dot line, and controls the energization time based on the transport speed of the thermal paper 26. When energized, each heating element 113a generates heat, forming dots on the printing surface of the thermal paper 26.

[0040] The transport unit 112 receives instructions from the control unit 101 and transports the thermal paper 26. The transport unit 112 includes, for example, a transport roller 112b and a DC motor 112a and gear 112c that drive the transport roller 112b. The cutting unit 114 receives instructions from the control unit 101 and cuts the thermal paper 26. The cutting unit 114 includes, for example, a movable blade 114c, a fixed blade 114b, and a DC motor 114a that drives the movable blade 114c. For example, the print head 113 prints on the thermal paper 26 transported by the transport roller 112b, and once the specified printing is completed, the movable blade 114c moves and cuts the thermal paper 26. The movable blade 114c may also be configured to perform a partial cut when cutting the thermal paper 26.

[0041] The detection unit 105 includes an encoder 117. The encoder 117 generates a detection signal in response to the rotation of the DC motor 112a, which drives the transport roller 112b. The control unit 101 obtains the transport speed and transport position of the thermal paper 26 transported by the transport roller 112b based on the detection signal from the encoder 117. The transport position of the thermal paper 26 may be, for example, the number of pulses in the detection signal from the encoder 117 after printing starts. When printing starts, the control unit 101 counts the number of pulses included in the detection signal from the encoder 117 and obtains the count value as the transport position of the thermal paper 26. The control unit 101 also obtains the transport speed of the thermal paper 26 by measuring the time it takes for the count value to increase by one. The control unit 101 then controls the transport speed of the thermal paper 26 by controlling the rotation speed of the DC motor 112a based on the transport speed and transport position of the thermal paper 26 and a transport speed table 111 stored in the memory unit 103. 4, the transport speed table 111 is information showing the correspondence between the transport position of the thermal paper 26 and the target transport speed for transporting the thermal paper 26. In the example of Fig. 4, the number of pulses i included in the detection signal by the encoder 117 after printing starts is defined as the i-th transport position, and the i-th target transport speed v(i) is associated with the i-th transport position.

[0042] When printing starts, the control unit 101 references the conveying speed table 111 each time the count value of the number of pulses included in the detection signal from the encoder 117 increments by one, and obtains the target conveying speed corresponding to that count value. For example, if the detection signal from the encoder 117 generates 1,440 pulses every time the thermal paper 26 is transported by one inch, then the detection signal from the encoder 117 generates one pulse every time the thermal paper 26 is transported 1 / 1440 inch. In this case, the conveying speed table 111 contains information on the target conveying speed every 1 / 1440 inch of the thermal paper 26. For example, if the print resolution is 180 dpi, 1 / 1440 inch corresponds to 1 / 8 dot, so the conveying speed table 111 contains information on the target conveying speed every 1 / 8 dot, and the control unit 101 can control the conveying speed of the thermal paper 26 in 1 / 8 dot increments.

[0043] The control unit 101 may control the rotation direction of the DC motor 112a so that the transport roller 112b transports the thermal paper 26 in the direction L2 before printing starts and in the direction L1 after printing starts.

[0044] In this embodiment, the control unit 101 controls the conveying speed of the thermal paper 26 by controlling the rotation speed of the DC motor 112a based on the conveying speed table 111 as well as the conveying specification information 120, acceleration table 121, and deceleration table 122 stored in the memory unit 103.

[0045] 5 is a diagram showing an example of the acceleration table 121. As shown in FIG. 5, the acceleration table 121 is information showing the correspondence relationship between the current conveying speed of the thermal paper 26 and the conveying speed during acceleration and deceleration. In the example of FIG. 5, the acceleration table 121 contains N+1 current conveying speeds va0 to va N The conveying speed during acceleration and the conveying speed during deceleration are associated with each of va0 and va N is the maximum speed v max and va0 <va1<va2<va3<va4<…<va N-1 <va NAfter printing starts, the acceleration table 121 changes the conveying speed of the thermal paper 26 from 0 to the maximum speed v max The control unit 101 refers to the acceleration table 121, and controls the rotation speed of the DC motor 112a so that, for example, if the acquired current conveying speed is va3, the next conveying speed is va4 when accelerating, and the next conveying speed is va2 when decelerating.

[0046] 6 is a diagram showing an example of the deceleration table 122. As shown in FIG. 6, the deceleration table 122 is information showing the correspondence relationship between the current conveying speed of the thermal paper 26 and the conveying speed during acceleration and deceleration. In the example of FIG. 6, the deceleration table 122 contains N+1 current conveying speeds vb0 to vb N The conveying speed during acceleration and the conveying speed during deceleration are associated with each of these. vb0 is the maximum speed v max and vb N is 0, and vb0>vb1>vb2>vb3>vb4>…>vb N-1 >vb N After the printing unit 104 finishes printing, the deceleration table 122 reduces the conveyance speed of the thermal paper 26 to the maximum speed v max The control unit 101 references the deceleration table 122 and controls the rotation speed of the DC motor 112a so that, for example, if the acquired current conveying speed is vb3, the next conveying speed is vb2 when accelerating, or vb4 when decelerating.

[0047] Before causing the printing unit 104 to execute printing, the control unit 101 may generate an acceleration table 121 and a deceleration table 122 based on the conveying speed table 111 and store them in the RAM of the storage unit 103. For example, if the conveying speed table 111 is set to a value greater than the maximum conveying speed v maxThe target transport speed increases monotonically with respect to the transport position of the thermal paper 26 until it reaches the maximum speed v max In this case, for example, the control unit 101 may calculate the conveying speed at the time of acceleration relative to the current conveying speed in the acceleration table 121 and the deceleration table 122 based on the portion of the conveying speed table 111 where the target conveying speed monotonically increases with respect to the conveying position of the thermal paper 26. Also, for example, the control unit 101 may calculate the conveying speed at the time of deceleration relative to the current conveying speed by back-calculating from the conveying speed at the time of acceleration relative to the current conveying speed. However, the acceleration table 121 and the deceleration table 122 may be stored in advance in the non-volatile memory of the storage unit 103.

[0048] In this embodiment, the control unit 101 decelerates the transport of the thermal paper 26 when the deceleration condition is met. Furthermore, when the deceleration condition is not met and the constant speed condition is met, the control unit 101 does not change the transport speed of the thermal paper 26 and maintains the current transport speed. Furthermore, when neither the deceleration condition nor the constant speed condition is met and the acceleration condition is met, the control unit 101 accelerates the transport of the thermal paper 26.

[0049] For example, the deceleration condition is met when the number of simultaneously energized heating elements 113a exceeds a threshold value, or during the period from the end of printing until the transport roller 112b stops or the control unit 101 receives the next print data. Also, for example, the acceleration condition is met when the transport speed is lower than the target transport speed for the transport position. Also, for example, when the transport speed is higher than the maximum speed v max The time from when the specified speed v is reached until printing is completed, s After reaching the specified distance d s The constant speed condition is satisfied during the period until the transport of the 1000-minute portion is completed.

[0050] Designated speed v of the thermal paper 26 s , specified distance d s and maximum speed v maxis included in the transport specification information 120 stored in the nonvolatile memory of the storage unit 103. The transport specification information 120 is information specifying various parameters related to the transport of the thermal paper 26, and the specified speed v s , specified distance d s and maximum speed v max In addition, for example, the information includes backfeed designation information that designates whether or not the transport roller 112b should backfeed the thermal paper 26 before starting to transport the thermal paper 26.

[0051] The detection unit 105 is equipped with a paper detection sensor 115. The paper detection sensor 115 detects the presence or absence of partially cut thermal paper 26, for example, near the media outlet 11. If the paper detection sensor 115 detects the presence of thermal paper 26 a predetermined time after printing is completed, the control unit 101 may notify the user that a slip remains by turning on the display unit 13, or may send information indicating that a slip remains to an external device via the communication unit 102.

[0052] The detection unit 105 also includes a paper-out detection sensor 116. The paper-out detection sensor 116 detects the presence or absence of thermal paper 26, for example, near the print head 113. In other words, the paper-out detection sensor 116 detects the presence or absence of thermal paper 26 upstream of the print head 113 in the transport direction of the thermal paper 26. If the paper-out detection sensor 116 detects that there is no thermal paper 26, the control unit 101 may notify the user that there is no medium P by turning on the display unit 13, or may send information indicating that there is no medium P to an external device via the communication unit 102.

[0053] The detection unit 105 also includes a near-end detector 118. The near-end detector 118 detects the near-end state of the medium P. When the near-end detector 118 detects that the medium P is in the near-end state, the control unit 101 may notify the user that the medium P is in the near-end state by turning on the display unit 13, or may send information indicating that the medium P is in the near-end state to an external device via the communication unit 102.

[0054] The detection unit 105 also includes an open / close sensor 119. The open / close sensor 119 detects whether the door 15 is open or closed. When the open / close sensor 119 detects that the door 15 is open, the control unit 101 may notify the user that the door 15 is open by turning on the display unit 13, or may transmit information indicating that the door 15 is open to an external device via the communication unit 102.

[0055] In the printer 1 configured as described above, when printing begins for the first time after the medium P is placed in the medium storage unit 215, or when backfeeding is performed before the thermal paper 26 begins to be transported, the thermal paper 26 will be pulled out of the medium P and still have some slack. Since slight slack may still occur in the thermal paper 26 even after printing is completed, the next printing will begin with the thermal paper 26 still having some slack, even if backfeeding is not performed. In FIG. 7 , as shown in ST1, if printing begins with slack in the thermal paper 26, the slack in the thermal paper 26 will decrease as the transport of the thermal paper 26 accelerates. However, as shown in ST2, the tension on the thermal paper 26 reaches its maximum the moment the slack disappears. The higher the transport speed of the thermal paper 26 at this moment, the greater the tension. If the tension is too great, the medium P will lift up, as shown in ST3, and flutter as the medium P falls, as shown in ST4. This causes a problem in that the user may hear an abnormal noise due to the flapping of the medium P when it falls. Therefore, in this embodiment, the control unit 101 controls the transport speed of the thermal paper 26 to make this problem less likely to occur.

[0056] An example of the procedure by which the control unit 101 controls the transport speed of the thermal paper 26 will be described with reference to Figures 8, 9, and 10. Figure 8 is a flowchart showing an example of the procedure of the control method for the printing device 1 in the first embodiment. Figure 9 is a diagram showing an example of the relationship between the transport distance and the transport speed when the transport speed is controlled according to the procedure in Figure 8. Figure 10 is a diagram showing an example of the change in state of the thermal paper 26 pulled out from the medium P when the transport speed is controlled according to the procedure in Figure 8.

[0057] 8, first, in step S10, the control unit 101 waits until printing starts. Printing may start, for example, when the control unit 101 finishes receiving print data.

[0058] Next, when printing starts in step S10, the current transport speed of the thermal paper 26 is 0, which is smaller than the target transport speed for the current transport position, so the acceleration condition is met. Therefore, next, in step S20, the control unit 101 performs a first acceleration transport process to accelerate the transport of the thermal paper 26 by the transport roller 112b based on the acceleration table 121. Then, in step S30, the control unit 101 determines whether the transport speed of the thermal paper 26 is equal to the designated speed v s , and the conveying speed of the thermal paper 26 reaches the designated speed v s 9, the control unit 101 repeats the first accelerated transport process of step S20 until the transport speed of the thermal paper 26 reaches the designated speed v s 10, when printing starts with the thermal paper 26 still slack, the first acceleration transport process reduces the slack in the thermal paper 26, as shown in ST11.

[0059] In step S30, the conveying speed of the thermal paper 26 is set to the designated speed v s When the specified speed v is reached, the constant speed condition is met, and then in step S40, the control unit 101 controls the conveyance roller 112b to move at the specified speed v sThen, in step S50, the control unit 101 controls the thermal paper 26 to move at a constant speed d s The thermal paper 26 is then conveyed by the specified distance d. s 9, after the first accelerated conveyance process is executed, the control unit 101 moves the conveyance roller 112b to convey the sheet by the specified distance d s minute specified speed v s 10, as shown in ST12, the slack in the thermal paper 26 disappears during the constant speed transport process, and the tension on the thermal paper 26 reaches its maximum. At this time, if the medium P is near the end, the angle between the direction in which the thermal paper 26 is pulled out and the vertically upward direction is relatively small, and the medium P is relatively light, so the medium P is likely to float up. However, the transport speed of the thermal paper 26 is set to the specified speed v s 10, the medium P does not float up, as shown in ST13. Therefore, the medium P does not fall, and no abnormal noise is generated due to flapping when the medium P falls.

[0060] In addition, the specified speed v s The specified distance d is set to a value equal to or less than the upper limit speed at which the medium P does not lift up when the tension is at its maximum. s is set to a value that eliminates slack in the thermal paper 26 during constant speed transport processing, taking into account the range of slack in the thermal paper 26 before printing begins. For example, the length of slack in the thermal paper 26 before the start of the first printing after the medium P is accommodated in the medium accommodation unit 215 is d1, the length of slack in the thermal paper 26 when backfeeding is performed before transporting the thermal paper 26 is d2, and the length of slack in the thermal paper 26 when backfeeding is not performed before transporting the thermal paper 26 is d3, where the relationship d1>d2>d3 holds. In this case, in order to maximize the tension on the thermal paper 26 during constant speed transport processing, the transport speed should be set to the specified speed v s The specified speed v is set so that the conveying distance dx when reaching sis set and the specified distance d s is set to a value greater than d1-dx. s Furthermore, in order to shorten the printing time as much as possible, the specified distance d s Specify the speed v s The specified speed v is set so that the execution time of the constant speed transport process obtained by dividing s and specified distance d s It is preferable to set

[0061] In step S50, the thermal paper 26 is moved at a specified distance d s When the thermal paper 26 is conveyed for 1 minute, the constant speed condition is no longer met, and the acceleration condition is met because the current conveying speed of the thermal paper 26 is slower than the target conveying speed for the current conveying position. Therefore, in step S60, the control unit 101 performs a second acceleration conveying process to accelerate the conveying of the thermal paper 26 by the conveying roller 112b based on the acceleration table 121. Then, in step S70, the control unit 101 determines whether the conveying speed of the thermal paper 26 is greater than the maximum speed v max and determines whether the transport speed of the thermal paper 26 reaches the maximum speed v max 9, the control unit 101 executes the second accelerated transport process in step S60 repeatedly until the transport speed of the thermal paper 26 reaches the maximum speed v max The second acceleration transport process is executed to accelerate the transport of the thermal paper 26 by the transport roller 112b until the transport reaches the predetermined position.

[0062] In step S70, the conveying speed of the thermal paper 26 is set to the maximum speed v max When the speed reaches the maximum speed v, the constant speed condition is met, and then in step S80, the control unit 101 controls the conveyance roller 112b to move at the maximum speed v max Then, the control unit 101 repeatedly performs the fastest transport process of step S80, transporting the thermal paper 26 at the maximum speed v , until printing is completed in step S90. That is, as shown in FIG. 9, after performing the second accelerated transport process, the control unit 101 continues to transport the transport roller 112b at the maximum speed v , until printing is completed. max The fastest transport process is executed to transport the thermal paper 26.

[0063] When printing ends in step S90, the deceleration condition is met, and then, in step S100, the control unit 101 performs a deceleration transport process in which the transport roller 112b slows down the transport speed based on the deceleration table 122. The control unit 101 then repeats the deceleration transport process of step S100 until the transport speed of the thermal paper 26 reaches 0 in step S110 or the next print data is received in step S120. That is, as shown in FIG. 9, after performing the fastest transport process, the control unit 101 performs the deceleration transport process in which the transport roller 112b slows down the transport speed of the thermal paper 26 until the transport of the thermal paper 26 ends or the next print data is received.

[0064] When the transport speed of the thermal paper 26 reaches 0 in step S110, the control unit 101 performs the processes from step S10 onwards again.

[0065] Furthermore, when the next print data is received in step S120, the deceleration condition is no longer met, and the acceleration condition is met because the current transport speed of the thermal paper 26 is slower than the target transport speed for the current transport position. Therefore, in step S130, the control unit 101 performs a third acceleration transport process to accelerate the transport of the thermal paper 26 by the transport roller 112b based on the acceleration table 121. Then, in step S140, the control unit 101 determines whether the transport speed of the thermal paper 26 reaches the maximum speed v max and determines whether the transport speed of the thermal paper 26 reaches the maximum speed v max 9, the control unit 101 executes the third accelerated transport process in step S130 repeatedly until the designated speed v is reached. s Even if the conveying speed is lower than the specified distance d s minute specified speed v sIn this case, the control unit 101 executes a third accelerated transport process in which the transport roller 112b accelerates the transport of the thermal paper 26 without transporting the thermal paper 26 at the deceleration speed. If there is a problem with instantly switching the transport of the thermal paper 26 by the transport roller 112b from deceleration to acceleration, the control unit 101 may execute a constant speed transport process between steps S120 and S130 in which the thermal paper 26 is transported a predetermined distance at the transport speed at that time.

[0066] Note that, during execution of the first acceleration transfer process in step S20, the constant speed transfer process in step S40, the second acceleration transfer process in step S60, the maximum speed transfer process in step S80, or the third acceleration transfer process in step S130, if, for example, the number of simultaneously energized heating elements 113a exceeds a threshold and a deceleration condition is met, the control unit 101 performs a deceleration transfer process to decelerate the transfer of the thermal paper 26. After the deceleration transfer process is completed, the control unit 101 performs a constant speed transfer process if the constant speed condition is met, and performs an acceleration transfer process if the constant speed condition is not met. For example, the control unit 101 may perform the deceleration transfer process if the deceleration condition is met during execution of the first acceleration transfer process in step S20, and then resume the first acceleration transfer process in step S20 after the deceleration transfer process is completed.

[0067] Furthermore, for example, the control unit 101 performs the deceleration conveyance process when the deceleration condition is met during the execution of the constant speed conveyance process in step S40, and then performs the acceleration conveyance process after the deceleration conveyance process is completed. s The accelerated transport process is performed until the transport speed reaches the specified speed v s When the conveyance distance reaches the specified distance d s If the conveyance distance does not reach the specified distance d, the constant speed conveyance process of step S40 is resumed. s If the constant speed conveyance process has reached the specified distance d, the process may proceed to the second accelerated conveyance process in step S60. s The transport speed of the thermal paper 26 is set to the specified speed v s If the control is performed so that the tension applied to the thermal paper 26 is maximized, the conveying speed will be the specified speed v sSince the height is kept below this, the medium P does not float up. Therefore, the medium P does not fall, and no abnormal noise is generated due to the medium P flapping when it falls.

[0068] As described above, in the printing device 1 of the first embodiment, the control unit 101 controls the conveying speed of the thermal paper 26 to be equal to or faster than the designated speed v after the conveying roller 112b starts conveying the thermal paper 26. s After the first acceleration transport process is performed, the control unit 101 accelerates the transport of the thermal paper 26 by the transport roller 112b until the specified distance d s minute specified speed v s After the constant speed transport process is performed, the control unit 101 controls the transport speed of the thermal paper 26 to be equal to or faster than the maximum speed v max In other words, according to the printing device 1 of the first embodiment, the control unit 101 executes the second accelerated transport process to accelerate the transport of the thermal paper 26 by the transport roller 112b until the transport speed of the thermal paper 26 reaches the designated speed v s When the temperature reaches 100°C, by executing the constant speed transport process before executing the second accelerated transport process, large tension is not generated when the slack in the thermal paper 26 is removed, reducing the risk of flapping of the medium P. As a result, the risk of abnormal noise caused by flapping of the medium P is reduced, and large tension caused by the medium P falling is not generated, so the thermal paper 26 is transported smoothly and print quality is improved.

[0069] Furthermore, in the printing apparatus 1 of the first embodiment, after the second accelerated conveying process is executed, the control unit 101 controls the conveying roller 112b to move at the maximum speed v max After the maximum speed transport process is performed, the control unit 101 performs a deceleration transport process to decelerate the transport of the thermal paper 26 by the transport roller 112b. In addition, when the control unit 101 performs the deceleration transport process to re-accelerate the transport of the thermal paper 26 before the transport of the thermal paper 26 is completed, the control unit 101 performs the deceleration transport process to re-accelerate the transport of the thermal paper 26 by the specified speed v s Even if the conveying speed is lower than the specified distance ds minute specified speed v s In this case, the control unit 101 executes a third acceleration transport process to accelerate the transport of the thermal paper 26 by the transport roller 112b without transporting the thermal paper 26 at the constant speed. In other words, since there is no slack in the thermal paper 26 during the execution of the second acceleration transport process, the fastest transport process, and the deceleration transport process, if the control unit 101 re-accelerates the transport of the thermal paper 26 during the deceleration transport process, even if the control unit 101 executes the third acceleration transport process quickly without executing the constant speed transport process, no large tension is generated in the medium P. Therefore, according to the printing device 1 of the first embodiment, the control unit 101 executes the third acceleration transport process quickly without executing the constant speed transport process, thereby shortening the printing time and improving the printing throughput.

[0070] 2. Second embodiment Below, for the liquid ejection device according to the second embodiment, components similar to those in the first embodiment will be given the same symbols, explanations that overlap with those in the first embodiment will be omitted, and the differences from the first embodiment will mainly be described.

[0071] In the first embodiment, when printing is started from a state in which the transport roller 112b is stopped, the control unit 101 always performs the constant-speed transport process after performing the first accelerated transport process. However, if the medium P is relatively heavy, i.e., if the diameter of the medium P is relatively large, the medium P is unlikely to lift up during transport of the thermal paper 26, and the control unit 101 does not necessarily perform the constant-speed transport process. Therefore, in the second embodiment, after performing the first accelerated transport process, if the diameter of the medium P is larger than a predetermined value, the control unit 101 performs the second accelerated transport process without performing the constant-speed transport process, thereby shortening the printing time. As described above, the near-end detector 118 detects a near-end state in which the diameter of the medium P becomes smaller than a predetermined value. Therefore, the control unit 101 determines whether to perform the constant-speed transport process based on the detection result of the near-end detector 118.

[0072] An example of the procedure by which the control unit 101 controls the transport speed of the thermal paper 26 in the second embodiment will be described with reference to Figures 10, 11, and 12. Figure 11 is a flowchart showing an example of the procedure of the control method for the printing device 1 in the second embodiment. The above-mentioned Figure 10 is a diagram showing an example of the state change of the thermal paper 26 when it is pulled out from a medium P in a near-end state when the transport speed is controlled according to the procedure of Figure 11. Figure 12 is a diagram showing an example of the state change of the thermal paper 26 when it is pulled out from a medium P that is not in a near-end state when the transport speed is controlled according to the procedure of Figure 11. In Figure 11, the same steps as in Figure 8 are assigned the same reference numerals, and their explanations will be omitted or simplified.

[0073] As shown in FIG. 11, when printing starts in step S10, the control unit 101 controls the conveying speed of the thermal paper 26 to be set to the designated speed v in step S30. s 10 or ST21 in Fig. 12, if printing starts with the thermal paper 26 still slack, the first accelerated transport process reduces the slack in the thermal paper 26.

[0074] In step S30, the conveying speed of the thermal paper 26 is set to the designated speed v s When the near-end detector 118 detects the near-end state of the medium P in step S31, the constant speed condition is met, and the control unit 101 moves the thermal paper 26 to the specified distance d in step S50. s That is, when the near-end detector 118 detects that the medium P is in a near-end state, the control unit 101 executes the first accelerated transport process, and then moves the transport roller 112b for the specified distance d s minute specified speed v s10, as shown in ST12, the slack in the thermal paper 26 disappears during the constant speed transport process, and the tension on the thermal paper 26 reaches its maximum. At this time, since the medium P is in a near-end state, the angle between the direction in which the thermal paper 26 is pulled out and the vertically upward direction is relatively small, and the medium P is relatively light, so the medium P is prone to floating up. However, the transport speed of the thermal paper 26 is set at the specified speed v s 10, the medium P does not float up, as shown in ST13. Therefore, the medium P does not fall, and no abnormal noise is generated due to flapping when the medium P falls.

[0075] In step S50, the thermal paper 26 is moved at a specified distance d s When the thermal paper 26 is conveyed for 1 minute, the constant speed condition is no longer met, and the acceleration condition is met because the current conveying speed of the thermal paper 26 is lower than the target conveying speed for the current conveying position. Therefore, in step S70, the control unit 101 sets the conveying speed of the thermal paper 26 to the maximum speed v max The second acceleration transfer process of step S60 is repeated until the target position is reached.

[0076] On the other hand, if the near-end detector 118 does not detect the near-end state of the medium P in step S31, the constant speed condition is not met, and the current transport speed of the thermal paper 26 is lower than the target transport speed for the current transport position, so the acceleration condition is met. Therefore, the control unit 101 determines in step S70 that the transport speed of the thermal paper 26 is increased to the maximum speed v max That is, if the near-end detector 118 does not detect a near-end state of the medium P, the control unit 101 executes the first accelerated transport process, and then moves the transport roller 112b to the designated distance d s minute specified speed v sIn this case, the second accelerated transport process is performed without performing the constant-speed transport process in which the thermal paper 26 is transported at a constant speed. As shown in ST22 in FIG. 12, the slack in the thermal paper 26 is eliminated during the second accelerated transport process, and the tension on the thermal paper 26 reaches its maximum. At this time, the medium P is not in a near-end state, so the angle between the direction in which the thermal paper 26 is pulled out and the vertically upward direction is relatively large. In addition, the medium P is relatively heavy. Therefore, even if the transport of the thermal paper 26 is accelerated, the medium P will not float up, as shown in ST23 in FIG. 12. Therefore, the medium P will not fall, and no abnormal noise will be generated due to the medium P flapping when it falls.

[0077] The procedure of the processes from step S80 onwards after the control unit 101 has completed the second accelerated transport process of step S60 is the same as that in FIG. 8, and therefore a description thereof will be omitted.

[0078] As described above, in the printing device 1 of the second embodiment, when the near-end detector 118 detects that the medium P is in a near-end state, the control unit 101 executes the first accelerated conveyance process and then moves the conveyance roller 112b by the specified distance d s minute specified speed v s In other words, according to the printing device 1 of the second embodiment, when the medium P reaches a near-end state, the direction of tension approaches a vertically upward direction and the medium P becomes lighter, making it more likely for the medium P to float up. However, by having the control unit 101 execute the constant speed transport process, no large tension is generated when the slack in the thermal paper 26 is removed, reducing the risk of the medium P flapping. As a result, the risk of abnormal noise caused by flapping of the medium P is reduced, and the large tension that would otherwise be generated by the medium P dropping is also not generated, allowing the thermal paper 26 to be transported more smoothly, improving print quality.

[0079] Furthermore, in the printing device 1 of the second embodiment, if the near-end detector 118 does not detect a near-end state of the medium P, the control unit 101 executes the first accelerated conveyance process and then moves the conveyance roller 112b by the specified distance d s minute specified speed v sIn this case, the control unit 101 executes the second accelerated transport process without executing the constant speed transport process, which transports the thermal paper 26 at a constant speed. In other words, if the medium P is not in a near-end state, the direction of tension is not vertically upward, and the medium P is relatively heavy and therefore does not easily lift up. Therefore, even if the control unit 101 executes the second accelerated transport process without executing the constant speed transport process, there is little risk of the medium P flapping. Therefore, according to the printing device 1 of the second embodiment, the control unit 101 executes the second accelerated transport process quickly without executing the constant speed transport process when the medium P is not in a near-end state, thereby shortening the printing time and improving printing throughput.

[0080] 3. Third embodiment Below, for the liquid ejection device according to the third embodiment, components similar to those in the first embodiment will be given the same symbols, explanations that overlap with those in the first embodiment will be omitted, and the main focus will be on the differences from the first embodiment.

[0081] In the first embodiment, when printing is started from a state in which the conveying roller 112b is stopped, the control unit 101 always executes the constant speed conveying process after executing the first accelerated conveying process. However, if the slack in the thermal paper 26 is relatively small, the slack in the thermal paper 26 disappears and the conveying distance until the tension on the thermal paper 26 reaches its maximum is short. Therefore, even if the conveying speed of the thermal paper 26 is accelerated, the conveying speed when the tension reaches its maximum is the specified speed v s The slack in the thermal paper 26 is kept to less than 0.05 m / s. Therefore, the possibility of the medium P floating up during transport of the thermal paper 26 is low, and the control unit 101 does not necessarily have to execute the constant speed transport process. For example, when printing is performed for the first time after the user opens the access door 15 and places the medium P in the medium storage unit 215, there is a possibility that the thermal paper 26 pulled out from the medium P will have a relatively large slack. However, when printing is performed for the second or subsequent times without opening the access door 15, it can be assumed that the slack in the thermal paper 26 will be very small.

[0082] Therefore, in the third embodiment, if the opening / closing door 15 cannot be opened before printing starts, the control unit 101 performs the first accelerated transport process and then performs the second accelerated transport process without performing the constant speed transport process, thereby shortening the printing time. As described above, the opening / closing sensor 119 detects whether the opening / closing door 15 is open or closed, so the control unit 101 determines whether to perform the constant speed transport process based on the detection result of the opening / closing sensor 119.

[0083] In addition, sagging occurs in the thermal paper 26 even when backfeeding is performed before the start of transport of the thermal paper 26, but in this embodiment, this sagging is relatively small, or the backfeed designation information included in the transport designation information 120 specifies that backfeeding will not be performed.

[0084] An example of the procedure by which the control unit 101 controls the transport speed of the thermal paper 26 in the third embodiment will be described with reference to FIGS. 10, 12, 13, and 14. FIG. 13 is a flowchart showing an example of the procedure of the control method for the printing device 1 in the third embodiment. The above-mentioned FIGS. 10 and 12 show an example of the state change of the thermal paper 26 drawn out from the medium P when the access door 15 is opened before printing starts, when the transport speed is controlled according to the procedure of FIG. 13. FIG. 14 shows an example of the state change of the thermal paper 26 drawn out from the medium P when the access door 15 is not opened before printing starts, when the transport speed is controlled according to the procedure of FIG. 13. In FIG. 13, the same steps as in FIG. 8 are assigned the same reference numerals, and their description will be omitted or simplified.

[0085] 13, first, in step S1, the control unit 101 sets the open / close flag stored in the RAM of the storage unit 103 to 0. Then, if the open / close sensor 119 detects that the open / close door 15 is open in step S11 before printing starts in step S10, the control unit 101 sets the open / close flag stored in the RAM of the storage unit 103 to 1 in step S12.

[0086] When printing starts in step S10, the control unit 101 controls the conveying speed of the thermal paper 26 to be set to the designated speed v in step S30. s The first accelerated transport process of step S20 is repeated until the target speed reaches 1 / 2000. As shown in ST11 of FIG. 10 or ST21 of FIG. 12, when the door 15 is opened before printing starts, printing starts with a relatively large slack in the thermal paper 26, and the first accelerated transport process reduces the slack in the thermal paper 26. On the other hand, as shown in ST31 of FIG. 14, when the door 15 is not opened before printing starts, printing starts with almost no slack in the thermal paper 26, and as shown in ST32 of FIG. 14, the slack in the thermal paper 26 disappears during the first accelerated transport process, and the tension on the thermal paper 26 becomes maximum. At this time, the transport speed of the thermal paper 26 is set to the specified speed v s 14, the medium P does not float up, as shown in ST33 in Fig. 14. Therefore, the medium P does not fall, and no abnormal noise is generated due to the medium P flapping when it falls.

[0087] In step S30, the conveying speed of the thermal paper 26 is set to the designated speed v s When the constant speed condition is met if the open / close flag is 1 in step S32, the control unit 101 moves the thermal paper 26 to the specified distance d in step S50. s That is, if the open / close sensor 119 detects that the door 15 is opened before the transport rollers 112b start transporting the thermal paper 26, the control unit 101 executes the first accelerated transport process and then controls the transport rollers 112b to move the thermal paper 26 at the specified distance d. s minute specified speed v s As shown in ST12 of FIG. 10 or ST22 of FIG. 12, the slack in the thermal paper 26 disappears during the constant speed transport process, and the tension applied to the thermal paper 26 becomes maximum. At this time, the transport speed of the thermal paper 26 is set to the specified speed v s 10 or ST23 in Fig. 12, the medium P does not rise up. Therefore, the medium P does not fall, and no abnormal noise is generated due to flapping when the medium P falls.

[0088] In step S50, the thermal paper 26 is moved at a specified distance d s When the thermal paper 26 is conveyed for 1 minute, the constant speed condition is no longer met, and the acceleration condition is met because the current conveying speed of the thermal paper 26 is lower than the target conveying speed for the current conveying position. Therefore, in step S70, the control unit 101 sets the conveying speed of the thermal paper 26 to the maximum speed v max The second acceleration transfer process of step S60 is repeated until the target position is reached.

[0089] On the other hand, if the open / close flag is 0 in step S32, the constant speed condition is not met, and the current transport speed of the thermal paper 26 is lower than the target transport speed for the current transport position, so the acceleration condition is met. Therefore, the control unit 101 determines in step S70 that the transport speed of the thermal paper 26 is increased to the maximum speed v max In other words, if the open / close sensor 119 does not detect that the door 15 is opened before the transport rollers 112b start transporting the thermal paper 26, the control unit 101 executes the first accelerated transport process and then moves the transport rollers 112b to the designated distance d. s minute specified speed v s The constant speed transport process for transporting the thermal paper 26 is not performed, but the second accelerated transport process is performed.

[0090] The processing procedure from step S80 onwards after the control unit 101 has completed the second accelerated conveying process of step S60 is the same as that shown in Figure 8, except that when the conveying speed of the thermal paper 26 reaches 0 in step S110, the control unit 101 returns to the processing of step S1, so the explanation of that will be omitted.

[0091] As described above, in the printing apparatus 1 of the third embodiment, when the open / close sensor 119 detects that the door 15 is opened before the conveyance roller 112b starts conveying the thermal paper 26, the control unit 101 executes the first accelerated conveyance process and then moves the conveyance roller 112b by the specified distance d s minute specified speed v sIn other words, with the printing device 1 of the third embodiment, when a user opens the access door 15, sets the medium P, and starts printing for the first time, there is a possibility that the thermal paper 26 pulled out from the medium P will be relatively slack. However, by having the control unit 101 execute the constant speed transport process, no large tension is generated when the slack in the thermal paper 26 is removed, reducing the risk of the medium P flapping. As a result, the risk of noise caused by flapping of the medium P is reduced, and the large tension that would otherwise be generated by the medium P dropping is also eliminated, resulting in smoother transport of the thermal paper 26 and improved print quality.

[0092] In the printing device 1 of the third embodiment, if the open / close sensor 119 does not detect that the door 15 is opened before the conveyance roller 112b starts conveying the thermal paper 26, the control unit 101 executes the first accelerated conveyance process and then moves the conveyance roller 112b by the specified distance d s minute specified speed v s In this case, the control unit 101 executes the second accelerated transport process without executing the constant speed transport process, which transports the thermal paper 26 at a constant speed. That is, when printing is performed without the opening / closing door 15 being open, it is assumed that the slack in the thermal paper 26 pulled out from the medium P is relatively small, so even if the control unit 101 executes the second accelerated transport process without executing the constant speed transport process, there is little risk of the medium P flapping. Therefore, according to the printing device 1 of the third embodiment, the control unit 101 executes the second accelerated transport process quickly without executing the constant speed transport process when the opening / closing door 15 cannot be opened, thereby shortening the printing time and improving printing throughput.

[0093] 4. Fourth embodiment Below, for the liquid ejection device according to the fourth embodiment, components similar to those in the first embodiment will be given the same symbols, explanations that overlap with those in the first embodiment will be omitted, and the main focus will be on the differences from the first embodiment.

[0094] In the first embodiment, when printing is started from a state in which the conveying roller 112b is stopped, the control unit 101 always executes the constant speed conveying process after executing the first accelerated conveying process. However, if the slack in the thermal paper 26 is relatively small, the slack in the thermal paper 26 disappears and the conveying distance until the tension on the thermal paper 26 reaches its maximum is short. Therefore, even if the conveying speed of the thermal paper 26 is accelerated, the conveying speed when the tension reaches its maximum is the specified speed v s Therefore, the possibility of the medium P floating up during transport of the thermal paper 26 is low, and the control unit 101 does not necessarily have to execute the constant speed transport process. For example, if backfeeding is performed before the start of transport of the thermal paper 26, the slack in the thermal paper 26 pulled out from the medium P may be relatively large, but if backfeeding is not performed before the start of transport of the thermal paper 26, it can be assumed that the slack in the thermal paper 26 is relatively small.

[0095] Therefore, in the fourth embodiment, if backfeeding is not performed before the start of transport of the thermal paper 26, the control unit 101 performs the first accelerated transport process and then performs the second accelerated transport process without performing the constant speed transport process, thereby shortening the printing time. As described above, the transport specification information 120 includes backfeed specification information that specifies whether or not to cause the transport roller 112b to backfeed the thermal paper 26 before the start of transport of the thermal paper 26, so the control unit 101 determines whether or not to perform the constant speed transport process based on the backfeed specification information.

[0096] After the user opens the door 15 and places the medium P in the medium storage section 215, the thermal paper 26 may sag when it is pulled out from the medium P during the first printing operation. However, in this embodiment, this slack is relatively small, and the conveying speed when the tension on the thermal paper 26 is at its maximum is the designated speed v s It shall be kept to the following:

[0097] An example of the procedure by which the control unit 101 controls the transport speed of the thermal paper 26 in the fourth embodiment will be described with reference to FIGS. 10, 14, and 15. FIG. 15 is a flowchart showing an example of the procedure for controlling the printing device 1 in the fourth embodiment. FIG. 10, mentioned above, is a diagram showing an example of the state change of the thermal paper 26 pulled out from the medium P when the transport speed is controlled according to the procedure in FIG. 15 and backfeeding is performed before the start of transport of the thermal paper 26. FIG. 14, mentioned above, is a diagram showing an example of the state change of the thermal paper 26 pulled out from the medium P when the transport speed is controlled according to the procedure in FIG. 15 and backfeeding is not performed before the start of transport of the thermal paper 26. In FIG. 15, the same steps as in FIG. 8 are assigned the same reference numerals, and their description will be omitted or simplified.

[0098] 15, when printing starts in step S10, if the backfeed designation information specifies that the transport roller 112b should backfeed the thermal paper 26 before starting to transport the thermal paper 26 in step S13, the control unit 101 performs a backfeed process in step S14 to cause the transport roller 112b to backfeed the thermal paper 26 a predetermined distance. On the other hand, if the backfeed designation information specifies that the transport roller 112b should not backfeed the thermal paper 26 before starting to transport the thermal paper 26 in step S13, the control unit 101 does not perform the backfeed process in step S14.

[0099] Then, in step S30, the control unit 101 determines whether the conveying speed of the thermal paper 26 is set to the designated speed v sThe first accelerated transport process of step S20 is repeated until the speed reaches the specified speed v. As shown in ST11 of FIG. 10, when backfeeding is performed before the start of transport of the thermal paper 26, there is a relatively large slack in the thermal paper 26, but the first accelerated transport process reduces the slack in the thermal paper 26. On the other hand, as shown in ST31 of FIG. 14, when backfeeding is not performed before the start of transport of the thermal paper 26, there is almost no slack in the thermal paper 26, so as shown in ST32 of FIG. 14, the slack in the thermal paper 26 disappears during the first accelerated transport process and the tension on the thermal paper 26 becomes maximum. At this time, the transport speed of the thermal paper 26 is set to the specified speed v s 14, the medium P does not float up, as shown in ST33 in Fig. 14. Therefore, the medium P does not fall, and no abnormal noise is generated due to the medium P flapping when it falls.

[0100] In step S30, the conveying speed of the thermal paper 26 is set to the designated speed v s When the backfeed instruction information specifies that the transport roller 112b should backfeed the thermal paper 26 before starting transport of the thermal paper 26, the constant speed condition is met, and the control unit 101 moves the thermal paper 26 to the specified distance d in step S50. s In other words, when the backfeed designation information designates that the thermal paper 26 is to be fed backward, the control unit 101 executes the first accelerated transport process after causing the transport roller 112b to feed the thermal paper 26 backward, and after executing the first accelerated transport process, causes the transport roller 112b to transport the thermal paper 26 forward by the designated distance d. s minute specified speed v s As shown in ST12 of FIG. 10, the slack in the thermal paper 26 disappears during the constant speed transport process, and the tension applied to the thermal paper 26 becomes maximum. At this time, the transport speed of the thermal paper 26 is set to the specified speed v s 10, the medium P does not rise up, as shown in ST13 of Fig. 10. Therefore, the medium P does not fall, and no abnormal noise is generated due to flapping when the medium P falls.

[0101] In step S50, the thermal paper 26 is moved at a specified distance d s When the thermal paper 26 is conveyed for 1 minute, the constant speed condition is no longer met, and the acceleration condition is met because the current conveying speed of the thermal paper 26 is lower than the target conveying speed for the current conveying position. Therefore, in step S70, the control unit 101 sets the conveying speed of the thermal paper 26 to the maximum speed v max The second acceleration transfer process of step S60 is repeated until the target position is reached.

[0102] On the other hand, in step S33, if the backfeed specification information specifies that the transport roller 112b should not backfeed the thermal paper 26 before the start of transport of the thermal paper 26, the constant speed condition is not met, and the current transport speed of the thermal paper 26 is lower than the target transport speed for the current transport position, so the acceleration condition is met. Therefore, the control unit 101 determines in step S70 that the transport speed of the thermal paper 26 is to be increased to the maximum speed v max In other words, when the backfeed designation information designates that the thermal paper 26 is not to be fed backward, the control unit 101 executes the first accelerated transport process, and then moves the transport roller 112b to the designated distance d s minute specified speed v s The constant speed transport process for transporting the thermal paper 26 is not performed, but the second accelerated transport process is performed.

[0103] The procedure of the processes from step S80 onwards after the control unit 101 has completed the second accelerated transport process of step S60 is the same as that in FIG. 8, and therefore a description thereof will be omitted.

[0104] As described above, in the printing device 1 of the fourth embodiment, when the backfeed designation information designates that the thermal paper 26 is to be fed back, the control unit 101 causes the transport roller 112b to feed the thermal paper 26 back, then executes the first accelerated transport process, and after executing the first accelerated transport process, causes the transport roller 112b to feed the thermal paper 26 back by the designated distance d s minute specified speed v sIn other words, according to the printing device 1 of the fourth embodiment, if backfeeding is performed before the start of conveyance of the thermal paper 26, the thermal paper 26 may become relatively slack. However, by having the control unit 101 execute the constant speed conveyance process, no large tension is generated when the slack in the thermal paper 26 is removed, reducing the risk of the medium P flapping. As a result, the risk of noise caused by flapping of the medium P is reduced, and the large tension that would otherwise be generated by the medium P dropping is also eliminated, resulting in smoother conveyance of the thermal paper 26 and improved print quality.

[0105] In the printing device 1 of the fourth embodiment, when the backfeed designation information designates that the thermal paper 26 is not to be backfed, the control unit 101 executes the first accelerated conveying process and then moves the conveying roller 112b by the designated distance d s minute specified speed v s In this case, the control unit 101 executes the second accelerated transport process without executing the constant speed transport process, which transports the thermal paper 26 at a constant speed. In other words, if backfeeding is not performed before the start of transport of the thermal paper 26, it is assumed that the slack in the thermal paper 26 is relatively small, so even if the control unit 101 executes the second accelerated transport process without executing the constant speed transport process, there is little risk of the medium P flapping. Therefore, according to the printing device 1 of the fourth embodiment, the control unit 101 executes the second accelerated transport process quickly without executing the constant speed transport process if backfeeding is not performed before the start of transport of the thermal paper 26, thereby shortening the printing time and improving printing throughput.

[0106] The present invention includes configurations that are substantially the same as the configurations described in this embodiment (for example, configurations with the same functions, methods, and results, or configurations with the same purpose and effects). The present invention also includes configurations in which non-essential parts of the configurations described in this embodiment are replaced. The present invention also includes configurations that achieve the same effects as the configurations described in this embodiment or that can achieve the same purpose. The present invention also includes configurations in which publicly known technology is added to the configurations described in this embodiment.

[0107] The present invention is not limited to the present embodiment, and various modifications are possible within the scope of the present invention.

[0108] For example, in each of the above embodiments, a thermal printer was described as an example of a printing device according to the present invention, but the printing device according to the present invention is not limited to a thermal printer and may be, for example, an inkjet printer.

[0109] The above-described embodiments are merely examples, and the present invention is not limited to these. For example, the embodiments can be appropriately combined.

[0110] The following can be derived from the above-described embodiment and modifications.

[0111] One aspect of the printing device is a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a designated distance, and a maximum speed for conveying the recording paper by the conveyance roller; a control unit that controls the transport speed of the recording paper by the transport roller, The control unit executes a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed in which the transport of the recording paper by the transport roller is accelerated until the transport speed of the recording paper reaches the maximum speed.

[0112] According to this printing device, when the conveying speed of the recording paper reaches the specified speed, the control unit executes a constant speed conveying process that causes the conveying roller to convey the recording paper at the specified speed for a specified distance before executing a second accelerated conveying process that accelerates the conveying of the recording paper until the conveying speed reaches the maximum speed.This prevents large tension from being generated when the slack in the recording paper is removed, reducing the risk of the roll paper flapping.

[0113] In one aspect of the printing device, The control unit After the second accelerated transport process is performed, a maximum speed transport process is performed in which the transport roller transports the recording paper at the maximum speed; After the maximum speed conveyance process is performed, a deceleration conveyance process is performed to decelerate the conveyance speed by the conveyance rollers. When the transport of the recording paper is to be accelerated again before the deceleration transport process is executed and the transport of the recording paper is completed, a third acceleration transport process may be executed in which the transport roller does not transport the recording paper at the specified speed for the specified distance, even if the transport speed is lower than the specified speed, but accelerates the transport of the recording paper by the transport roller.

[0114] With this printing device, there is no slack in the recording paper during the second accelerated transport process, the fastest transport process, and the decelerated transport process, so if the control unit re-accelerates the transport of the recording paper during the decelerated transport process, no significant tension is generated in the roll paper even if the control unit quickly executes the third accelerated transport process, which accelerates the transport of the recording paper by the transport rollers without executing the constant speed transport process. Therefore, with this printing device, the control unit can quickly execute the third accelerated transport process without executing the constant speed transport process, thereby shortening printing time and improving printing throughput.

[0115] One aspect of the printing device is a near-end detector for detecting a near-end state in which the diameter of the roll paper is smaller than a predetermined value; The control unit If the near-end detector does not detect the near-end state, after the first accelerated transport process is performed, the second accelerated transport process is performed without performing the constant speed transport process, When the near-end detector detects the near-end state, the constant speed transport process may be executed after the first accelerated transport process is executed.

[0116] With this printing device, when the roll paper reaches a near-end state, the direction of tension approaches a vertically upward direction and the roll paper becomes lighter, making it more likely to float up; however, by having the control unit execute a constant-speed transport process, no large tension is generated when the slack in the recording paper is removed, reducing the risk of the roll paper flapping.

[0117] On the other hand, if the roll paper is not near-end, the tension direction is not vertically upward, and the roll paper is relatively heavy, so the roll paper is less likely to lift up, and so there is little risk of the roll paper flapping even if the control unit performs the second accelerated transport process without performing the constant speed transport process. Therefore, with this printing device, the control unit can quickly perform the second accelerated transport process without performing the constant speed transport process when the roll paper is not near-end, thereby shortening printing time and improving printing throughput.

[0118] One aspect of the printing device is an opening / closing door facing the roll paper storage section; An opening / closing sensor that detects the opening and closing of the opening / closing door, The control unit If the open / close sensor does not detect that the open / close door has been opened before the conveyance of the recording paper by the conveyance roller is started, after the first accelerated conveyance process is performed, the second accelerated conveyance process is performed without performing the constant speed conveyance process; If the opening / closing sensor detects that the opening / closing door has been opened before the transport roller starts transporting the recording paper, the constant speed transport process may be executed after the first accelerated transport process.

[0119] With this printing device, when a user opens the door, sets the roll paper, and starts printing for the first time, there is a possibility that the recording paper pulled out from the roll paper will have a relatively large slack, but by having the control unit perform a constant speed transport process, no large tension is generated when the slack in the recording paper is removed, reducing the risk of the roll paper flapping.

[0120] On the other hand, if printing is performed without the door being open, it is assumed that the slack in the recording paper pulled from the roll paper will be relatively small, so even if the control unit performs the second accelerated transport process without performing the constant speed transport process, there is little risk of the roll paper flapping. Therefore, with this printing device, the control unit can quickly perform the second accelerated transport process without performing the constant speed transport process when the door cannot be opened, thereby shortening printing time and improving printing throughput.

[0121] In one aspect of the printing device, the storage unit stores backfeed designation information that designates whether or not the transport roller should backfeed the recording paper before starting transport of the recording paper; The control unit When the backfeed designation information designates that the recording paper is not to be backfed, after the first accelerated transport process is performed, the second accelerated transport process is performed without performing the constant speed transport process, When the backfeed designation information specifies that the recording paper is to be backfed, the first accelerated conveying process may be executed after the conveying roller is caused to backfeed the recording paper, and the constant speed conveying process may be executed after the first accelerated conveying process is executed.

[0122] With this printing device, if backfeeding is performed before the recording paper starts to be transported, there is a possibility that the recording paper will become relatively slack. However, by having the control unit execute a constant speed transport process, no large tension is generated when the slack in the recording paper is eliminated, reducing the risk of the roll paper flapping.

[0123] On the other hand, if backfeeding is not performed before the start of recording paper transport, it is assumed that the slack in the recording paper is relatively small, so even if the control unit performs the second accelerated transport process without performing the constant speed transport process, there is little risk of the roll paper flapping. Therefore, with this printing device, if backfeeding is not performed before the start of recording paper transport, the control unit can quickly perform the second accelerated transport process without performing the constant speed transport process, thereby shortening printing time and improving printing throughput.

[0124] One aspect of a control method for a printing device includes: a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a maximum speed, and a designated distance for conveying the recording paper by the conveyance roller, executes a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed in which the transport of the recording paper by the transport roller is accelerated until the transport speed of the recording paper reaches the maximum speed.

[0125] According to this control method for a printing device, when the recording paper transport speed reaches a specified speed, a constant speed transport process is executed in which the transport roller transports the recording paper at a specified speed for a specified distance before executing a second accelerated transport process in which the transport of the recording paper is accelerated until the transport speed reaches the maximum speed.This prevents large tension from being generated when the recording paper slack is removed, reducing the risk of the roll paper flapping. [Explanation of symbols]

[0126] 1...printing device, 10...main body case, 11...media discharge port, 13...display unit, 15...opening / closing door, 16...cable notch, 26...thermal paper, 31...power switch, 32...opening / closing lever, 101...control unit, 102...communication unit, 103...storage unit, 104...printing unit, 105...detection unit, 111...conveyance speed table, 112...conveyance unit, 112a...DC motor, 112b...conveyance roller, 112c...gear, 113...print head, 1 13a...heating element, 114...cutting section, 114a...DC motor, 114b...fixed blade, 114c...movable blade, 115...paper detection sensor, 116...paper out detection sensor, 117...encoder, 118...near end detector, 119...open / close sensor, 120...transport designation information, 121...acceleration table, 122...deceleration table, 213...disk, 214...photo sensor, 215...media storage section, 216...hinge, P...media

Claims

1. a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a designated distance, and a maximum speed for conveying the recording paper by the conveyance roller; a control unit that controls the transport speed of the recording paper by the transport roller, The control unit a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed to accelerate the transport of the recording paper by the transport roller until the transport speed of the recording paper reaches the maximum speed; After the second accelerated transport process is performed, a maximum speed transport process is performed in which the transport roller transports the recording paper at the maximum speed; After the fastest transport process is performed, a deceleration transport process is performed to decelerate the transport speed of the transport rollers. When the transport of the recording paper is to be accelerated again before the deceleration transport process is executed and the transport of the recording paper is completed, a printing device executes a third acceleration transport process in which the transport roller does not transport the recording paper at the specified speed for the specified distance, even if the transport speed is lower than the specified speed, but instead accelerates the transport of the recording paper by the transport roller.

2. a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a designated distance, and a maximum speed for conveying the recording paper by the conveyance roller; a control unit that controls the transport speed of the recording paper by the transport roller, The control unit a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed to accelerate the transport of the recording paper by the transport roller until the transport speed of the recording paper reaches the maximum speed; a near-end detector for detecting a near-end state in which the diameter of the roll paper is smaller than a predetermined value; The control unit If the near-end detector does not detect the near-end state, the first accelerated transport process is executed, and then the second accelerated transport process is executed without executing the constant speed transport process; When the near-end detector detects the near-end state, the printing apparatus executes the first accelerated transport process and then executes the constant speed transport process.

3. a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a designated distance, and a maximum speed for conveying the recording paper by the conveyance roller; a control unit that controls the transport speed of the recording paper by the transport roller, The control unit a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed to accelerate the transport of the recording paper by the transport roller until the transport speed of the recording paper reaches the maximum speed; an opening / closing door facing the roll paper storage section; An opening / closing sensor that detects the opening and closing of the opening / closing door, The control unit If the open / close sensor does not detect that the open / close door has been opened before the conveyance of the recording paper by the conveyance roller is started, the first accelerated conveyance process is executed, and then the second accelerated conveyance process is executed without executing the constant speed conveyance process; When the opening / closing sensor detects that the door has been opened before the transport roller starts transporting the recording paper, the printing device performs the first accelerated transport process and then the constant speed transport process.

4. a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a designated distance, and a maximum speed for conveying the recording paper by the conveyance roller; a control unit that controls the transport speed of the recording paper by the transport roller, The control unit a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed to accelerate the transport of the recording paper by the transport roller until the transport speed of the recording paper reaches the maximum speed; the storage unit stores backfeed designation information that designates whether or not the transport roller should backfeed the recording paper before starting transport of the recording paper; The control unit When the backfeed designation information designates that the recording paper is not to be backfed, after the first accelerated transport process is performed, the second accelerated transport process is performed without performing the constant speed transport process, When the backfeed designation information specifies that the recording paper is to be backfed, the printing device causes the transport roller to backfeed the recording paper, then executes the first accelerated transport process, and after executing the first accelerated transport process, executes the constant speed transport process.

5. a transport roller that pulls out and transports recording paper from the roll paper; a storage unit that stores a designated speed, a maximum speed, and a designated distance for conveying the recording paper by the conveyance roller, a first acceleration conveyance process for accelerating the conveyance of the recording paper by the conveyance roller from the start of conveyance of the recording paper by the conveyance roller until the conveyance speed of the recording paper reaches the designated speed; After the first accelerated transport process is performed, a constant speed transport process is performed in which the transport roller transports the recording paper at the specified speed by the specified distance; After the constant speed transport process is performed, a second accelerated transport process is performed to accelerate the transport of the recording paper by the transport roller until the transport speed of the recording paper reaches the maximum speed; After the second accelerated transport process is performed, a maximum speed transport process is performed in which the transport roller transports the recording paper at the maximum speed; After the fastest transport process is performed, a deceleration transport process is performed to decelerate the transport speed of the transport rollers. A control method for a printing device, in which, when the transport of the recording paper is to be accelerated again before the deceleration transport process is executed and the transport of the recording paper is completed, a third acceleration transport process is executed in which the transport roller does not transport the recording paper at the specified speed for the specified distance, even if the transport speed is lower than the specified speed, but instead accelerates the transport of the recording paper by the transport roller.

Images