JP2008049638A - Printer and printer control method - Google Patents

Abstract

A printer having a configuration capable of improving throughput is provided.
A controller 50 that controls the transport motor 14 and the supply motor 31 so that the peripheral speeds of the supply roller 27 and the transport roller 4 that transport the print medium in cooperation with the transport roller 4 are substantially the same. The first estimated temperature inside the conveyance motor 14 and the second estimated temperature inside the supply motor 31 after intermittent conveyance of the print medium are calculated, and at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature. In order to enable appropriate control of the transport motor 14 and the supply motor 31 at the time of the next intermittent transport, a new rotational speed lower than the first target reaching rotational speed at the previous intermittent transport is set. The rotation of the conveyance motor 14 is controlled as one target arrival rotation speed, and a rotation speed lower than the second target arrival rotation speed at the previous intermittent conveyance is supplied as a new second target arrival rotation speed. It controls the rotation of the over data 31.
[Selection] Figure 2

Description

  The present invention relates to a printer and a printer control method.

  As an inkjet printer that prints on a printing medium such as printing paper, a paper feed roller that supplies the printing paper to the inside of the printer, and a paper that conveys the printing paper when printing on the printing paper supplied to the inside of the printer A printer including a feed roller is known (for example, see Patent Documents 1 and 2).

  In the printer described in Patent Document 1, the paper feed roller is connected to a paper feed motor that rotationally drives the paper feed roller via a clutch. The printing paper set in the paper feed hopper is first transported to the position of the paper feed roller by the paper feed roller connected to the paper feed motor. When the printing paper is conveyed to the position of the paper feeding roller, the paper feeding roller and the paper feeding motor are disconnected, and the subsequent printing paper is conveyed by the paper feeding roller.

  In the printer described in Patent Document 2, the paper feed roller and the paper feed roller are rotationally driven by separate motors. Also in this printer, similarly to the printer described in Patent Document 1, the printing paper is conveyed to the position of the paper feeding roller by the paper feed roller, and the subsequent printing paper is conveyed by the paper feeding roller.

JP 2003-72964 A JP 2006-117385 A

  In recent years, in the printer market, improvement in throughput (the number of printed sheets per unit time) during continuous printing in which printing is continuously performed on a plurality of printing papers is required. However, in the printers described in Patent Documents 1 and 2, the printing paper is taken up to the position of the paper feed roller by the paper feed roller, and the subsequent conveyance of the printing paper is performed by the paper feed roller. That is, the printing operation or paper discharge operation and the paper feeding operation are separate operations. Therefore, the printers described in Patent Documents 1 and 2 have a limit in improving throughput.

  Accordingly, an object of the present invention is to provide a printer having a configuration capable of further improving the throughput. Another object of the present invention is to provide a printer control method capable of further improving the throughput.

  In order to solve the above-described problems, a printer of the present invention includes a conveyance roller that can intermittently convey a print medium supplied from a medium setting unit on which a print medium before printing is set, and a conveyance motor that drives the conveyance roller. A supply roller capable of intermittently conveying the print medium supplied from the medium setting unit in cooperation with the conveyance roller, a supply motor for driving the supply roller, and a conveyance A control unit that controls the rotation speed of the conveyance motor and the supply motor so that the peripheral speed of the roller and the peripheral speed of the supply roller are substantially the same. When the first estimated temperature and the second estimated temperature inside the supply motor are calculated, and at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature Or, when the temperature exceeds a predetermined temperature, the first target rotation speed of the transport motor during the previous intermittent transport is such that the peripheral speed of the transport roller and the peripheral speed of the supply roller are substantially the same during the next intermittent transport. The conveyance motor is controlled to rotate at a rotation speed lower than the number as the first target arrival rotation speed at the next intermittent conveyance, and the rotation speed lower than the second target arrival rotation speed of the supply motor at the previous intermittent conveyance is set. The supply motor is controlled to rotate as the second target reaching rotational speed at the next intermittent conveyance.

  In the printer of the present invention, the control unit rotates the conveyance motor and the supply motor so that the peripheral speed of the supply roller that conveys the print medium in cooperation with the conveyance roller is substantially the same as the peripheral speed of the conveyance roller. Is controlling. Therefore, the supply roller and the conveyance roller can be rotated in synchronization. Therefore, the print medium supply operation can be performed without hindering the print medium discharge operation and the print operation. That is, the printing operation, the discharge operation, and the supply operation can be performed as a series of operations, and the throughput can be further improved during continuous printing. Further, since the supply roller and the conveyance roller can be rotated in synchronization, the print medium can be appropriately conveyed between the supply roller and the conveyance roller. As a result, it is possible to suppress the generation of sound of the print medium that may occur during conveyance (by the print medium sagging or stretching) due to a change in tension applied to the print medium.

  In the present invention, the control unit calculates the first estimated temperature inside the conveyance motor and the second estimated temperature inside the supply motor after intermittent conveyance of the print medium, and at least the first estimated temperature and the second estimated temperature. When either one of them reaches a predetermined temperature or exceeds the predetermined temperature, the peripheral speed of the transport roller and the peripheral speed of the supply roller are substantially the same at the previous intermittent transport during the next intermittent transport. The conveyance motor is controlled to rotate at a rotation speed lower than the first target arrival rotation speed of the conveyance motor at the first intermittent conveyance at the next intermittent conveyance, and the second supply motor at the previous intermittent conveyance is controlled. The supply motor is rotationally controlled with a rotation speed lower than the target arrival rotation speed as a second target arrival rotation speed at the next intermittent conveyance. Therefore, when the first estimated temperature inside the conveyance motor or the second estimated temperature inside the supply motor reaches a predetermined temperature and so-called heat generation restriction control for preventing burnout or the like is necessary, the conveyance motor and the supply By reducing the number of revolutions reached by the motor, it is possible to reduce the load and suppress the heat generation of the conveyance motor and the supply motor, and to rotate the supply roller and the conveyance roller in an appropriately synchronized manner.

  In the present invention, the first target reaching rotation speed and the second target reaching rotation speed are individually and stepwise set for each of the transport motor and the supply motor, and the control unit is at least one of the first estimated temperature and the second estimated temperature. When one of them reaches a predetermined temperature or exceeds or exceeds a predetermined temperature, it is preferable to gradually decrease the first target reaching rotational speed and the second target reaching rotational speed. If comprised in this way, while suppressing the heat_generation | fever of a conveyance motor or a supply motor, while being able to synchronize a supply roller and a conveyance roller appropriately, it becomes possible to convey a printing medium as fast as possible. .

  In the present invention, the control unit is configured to output at least one of the first estimated temperature and the second estimated temperature when the first target reaching rotational speed and / or the second target reaching rotational speed at the time of transporting the print medium is a minimum value. When one of the temperature exceeds a predetermined temperature or exceeds a predetermined temperature, it is preferable to stop the transport motor and the supply motor. When at least one of the first estimated temperature and the second estimated temperature is equal to or higher than the predetermined temperature or exceeds the predetermined temperature, even though the first and second target reaching rotational speeds are minimum values, the conveyance motor In addition, it is difficult to rotate the supply roller and the conveyance roller while appropriately synchronizing while suppressing the heat generation of the supply motor. Therefore, with this configuration, it is possible to prevent damage to the print medium and generation of sound due to the print medium while preventing the conveyance motor and the supply motor from being burned out.

  In the present invention, the printer includes a first encoder connected to the control unit and capable of detecting the rotational speed of the transport motor, and a second encoder connected to the control unit and capable of detecting the rotational speed of the supply motor. The unit preferably stops the transport motor and the supply motor when an output signal from at least one of the first encoder and the second encoder cannot be detected. When an output signal from at least one of the first encoder and the second encoder cannot be detected, an abnormal situation has occurred. With this configuration, it is possible to prevent clogging of the print medium and damage inside the printer.

  In order to solve the above-described problem, a printer control method of the present invention includes a conveyance roller that is driven by a conveyance motor and conveys a print medium supplied from a medium setting unit on which a print medium before printing is set; A supply roller that is driven by a supply motor and rotates a supply roller that supplies a printing medium from the medium setting unit at substantially the same peripheral speed, and a printing medium supplied from the medium setting unit by cooperating the transport roller and the supply roller. A conveyance step for intermittent conveyance; a temperature calculation step for calculating a first estimated temperature inside the conveyance motor and a second estimated temperature inside the supply motor after intermittent conveyance of the print medium in the conveyance step; When at least one of the second estimated temperatures is equal to or higher than a predetermined temperature or exceeds a predetermined temperature, the peripheral speed of the transport roller is set during the next intermittent transport. And the peripheral speed of the supply roller are substantially equal to each other, the rotation speed lower than the first target arrival rotation speed of the conveyance motor at the previous intermittent conveyance is set to the first target of the conveyance motor at the next intermittent conveyance. Rotation speed that is set as the reached rotation speed and that is set as the second target arrival rotation speed of the supply motor at the next intermittent conveyance is lower than the second target arrival rotation speed of the supply motor at the previous intermittent conveyance. And a setting step.

  In the printer control method of the present invention, in the transport step, the transport roller and the supply roller are rotated at substantially the same peripheral speed, and the print medium is transported by the cooperation of the transport roller and the supply roller. Therefore, the supply roller and the conveyance roller can be rotated in synchronization, and the throughput can be further improved during continuous printing. In addition, the print medium can be appropriately conveyed between the supply roller and the conveyance roller, and the generation of sound on the print medium can be suppressed.

  In the present invention, the first estimated temperature inside the conveyance motor and the second estimated temperature inside the supply motor are calculated in the temperature calculating step, and at least one of the first estimated temperature and the second estimated temperature is calculated in the rotation speed setting step. When either of them is above the predetermined temperature or exceeds the predetermined temperature, the peripheral speed of the transport roller and the peripheral speed of the supply roller are substantially the same at the previous intermittent transport at the next intermittent transport. The rotation speed lower than the first target reaching rotation speed of the transport motor is set as the first target reaching rotation speed at the time of the next intermittent transfer, and the second target reaching rotation speed of the supply motor at the previous intermittent transfer is set. Is set as the second target reaching rotational speed at the time of the next intermittent conveyance. For this reason, when it is necessary to control the heat generation of the conveyance motor and the supply motor, the heat generation of the conveyance motor and the supply motor is suppressed by reducing the ultimate rotation speed of the conveyance motor and the supply motor, and the supply roller It becomes possible to rotate the conveying roller in synchronization with the conveying roller.

  Hereinafter, a printer and a printer control method according to an embodiment of the present invention will be described with reference to the drawings.

(Schematic configuration of the printer)
FIG. 1 is a side view showing a schematic configuration of a main part of a printer 1 according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing a schematic configuration of a drive unit such as the PF drive roller 4 shown in FIG. 3 is a diagram for explaining the operation of the paper feed hopper 26 and the retard roller 28 shown in FIG. 1. FIG. 3A shows the inside of the printer 1 when the lower end of the paper feed hopper 26 and the retard roller 28 are raised. (B) shows that the lower end of the paper feed hopper 26 and the retard roller 28 are lowered so that the printing paper P cannot be supplied to the inside of the printer 1. It shows the state.

  The printer 1 of the present embodiment is an ink jet printer that performs printing by ejecting ink droplets onto a printing paper P that is a printing medium. Both the front side (left side in FIG. 1) and the rear side (right side in FIG. 1) The printing paper P can be supplied from the side. As shown in FIG. 1, the printer 1 transports a print sheet P supplied from a carriage 3 on which a print head 2 for ejecting ink droplets is mounted, a paper feed hopper 26 and the like, which will be described later, in the sub-scanning direction SS. A PF drive roller 4 as a transport roller, a PF driven roller 5 that transports the print paper P together with the PF drive roller 4, a paper discharge drive roller 6 that discharges the print paper P to the outside of the printer 1, and a paper discharge driven roller 7. A platen 8 facing the ink ejection surface (the lower surface in FIG. 1) of the print head 2, a paper detection device 9 for detecting the passage of the print paper P supplied from the paper feed hopper 26, etc., and the print head 2, a front paper feeding mechanism 10 for supplying the printing paper P from the front side toward the printing area where printing is performed, and a rear paper feeding mechanism 11 for supplying the printing paper P from the rear side toward the printing area. It is equipped with a. In addition to the printing paper P such as plain paper used for normal document printing, photographic paper used for photo printing, thick paper thicker than plain paper or photographic paper, etc. And transparent films such as OHP sheets.

  As shown in FIG. 2, the PF drive roller 4 is connected to a PF motor 14 serving as a transport motor directly or via a gear or the like not shown. The PF motor 14 of this embodiment is a DC (direct current) motor. In this embodiment, PWM control is adopted as a method for controlling the PF motor 14, and the current rotational speed (current rotational speed) of the PF motor 14 is set to the target rotational speed by combining proportional control, integral control, and differential control. PID control, which is control for convergence to (target rotational speed), is employed. The PF driven roller 5 is urged toward the PF driving roller 4 by a spring (not shown) and rotates together with the PF driving roller 4.

  As shown in FIG. 2, the paper discharge driving roller 6 is connected to the PF driving roller 4 via a transmission mechanism such as a pulley 18 and a belt 19. The rotation of the paper discharge driving roller 6 is synchronized with the rotation of the PF driving roller 4. That is, the paper discharge driving roller 6 rotates at a circumferential speed substantially the same as the circumferential speed of the PF driving roller 4. The paper discharge driven roller 7 is urged toward the paper discharge drive roller 6 by a spring (not shown) and rotates together with the paper discharge drive roller 6. The paper detection device 9 is an optical detection device in which a light emitting element and a light receiving element (not shown) are arranged to face each other in the vertical direction, and one end in the width direction of the printing paper P passing between the light emitting element and the light receiving element. Detect the part.

  The front paper feed mechanism 10 includes a paper feed cassette 20 in which the print paper P supplied from the front side is set, a front paper feed roller 21 that supplies the print paper P in the paper feed cassette 20 to the inside of the printer 1, And a conveyance path 23 through which the printing paper P taken in from the front side passes. The front paper feed roller 21 is attached to the tip of an arm 22 configured to be swingable about a rotation shaft 22 a and is in pressure contact with the upper surface of the printing paper P. The front paper feed roller 21 conveys the printing paper P into the printer 1 until the leading edge of the printing paper P reaches the PF driving roller 4.

  The rear paper feeding mechanism 11 prints the paper hopper 26 as a medium setting unit on which the printing paper P before printing supplied from the rear side is set, and the printing paper P on the paper feeding hopper 26 by the print head 2. Are provided with a rear feed roller 27 as a supply roller for feeding toward the printing area where the printing is performed, and a retard roller 28 for preventing double feeding of the printing paper P.

  As shown in FIG. 2, the rear paper feed roller 27 is connected to an ASF motor 31 as a supply motor via a gear train 29 and a planetary gear train 30. The front paper feed roller 21 is also connected to the ASF motor 31 via the planetary gear train 30 and the like (illustration of the front paper feed roller 21 is omitted in FIG. 2). In the present embodiment, when the ASF motor 31 rotates in one direction by the action of the planetary gear train 30, the rear paper feeding roller 27 rotates, and when the ASF motor 31 rotates in the other direction, the front paper feeding roller 21 rotates. The ASF motor 31 of this embodiment is a DC motor, and is PWM-controlled and PID-controlled as with the PF motor 14.

  The paper feed hopper 26 is a plate-like member on which the printing paper P can be placed, and can swing around a rotation shaft 26a provided on the upper end side. The retard roller 28 is disposed at a position facing the diagonally lower side of the rear paper feed roller 27 and is rotatably held by an arm (not shown) configured to be swingable about a rotation shaft (not shown). . By rotation of a cam (not shown), the paper feed hopper 26 swings around the rotation shaft 26a, and the arm holding the retard roller 28 also swings. By this swinging, the lower end portion of the paper feed hopper 26 is urged toward the rear paper feed roller 27 and is separated from the rear paper feed roller 27. Further, by this swinging, the retard roller 28 is pressed against the rear paper feed roller 27 and is separated from the rear paper feed roller 27. That is, as the cam rotates, the lower end portion of the paper feed hopper 26 and the retard roller 28 rise as shown in FIG. 3 (A), and the lower end portion of the paper feed hopper 26 as shown in FIG. 3 (B). And the retard roller 28 descends. The state shown in FIG. 3A is a state in which the printing paper P can be supplied to the inside of the printer 1. The state shown in FIG. 3B is a state in which the printing paper P cannot be supplied from the rear side to the inside of the printer 1.

  Further, as shown in FIG. 2, the printer 1 includes a PF encoder 40 as a first encoder for detecting the rotational speed of the PF motor 14, and a second encoder for detecting the rotational speed of the ASF motor 31. The ASF encoder 41 is provided. The PF encoder 40 includes a rotary scale 43 fixed to the rotating shaft of the PF drive roller 4 and a photosensor 44 having a light emitting element and a light receiving element (not shown). The ASF encoder 41 includes a rotary scale 45 fixed to the output shaft of the ASF motor 31 and a photosensor 46 having a light emitting element and a light receiving element (not shown). Output signals from the PF encoder 40 and the ASF encoder 41 are input to a control unit 50 that performs various controls of the printer 1.

  In this embodiment, a rectangular pulse signal is output from the PF encoder 40 and the ASF encoder 41, or a rectangular shape is output by the control unit 50 based on an output signal from the PF encoder 40 or the ASF encoder 41. A pulse signal is generated. Based on this rectangular pulse signal, the rotational speed of the PF motor 14 and the ASF motor 31 is detected. Hereinafter, based on the output signal from the PF encoder 40 or based on the output signal from the PF encoder 40, the pulse signal generated by the control unit 50 is set as the PF pulse signal and output from the ASF encoder 41, or the ASF encoder Based on the output signal from 41, the pulse signal generated by the control unit 50 is defined as an ASF pulse signal.

(Schematic configuration of control unit)
FIG. 4 is a block diagram showing a schematic configuration of the control unit 50 and its peripheral devices shown in FIG. FIG. 5 is a table showing an example of the calorific value reference table stored in the memory 53 shown in FIG. FIG. 4 shows only the configuration of the control unit 50 related to the control of the PF motor 14 and the ASF motor 31.

  As described above, since the PF motor 14 and the ASF motor 31 of the present embodiment are PID-controlled, the control unit 50 has a configuration related to the control of the PF motor 14 and the ASF motor 31 as shown in FIG. A speed calculation unit 61, a position calculation unit 62, and a PID control unit 63 for performing PID control are provided. Further, the control unit 50 includes a heat generation restriction control unit 64 for performing so-called heat generation restriction control in order to prevent burning, smoke generation, or ignition of the windings constituting the PF motor 14 or the ASF motor 31. Further, the control unit 50 includes a memory 53 in which a control program of the printer 1 and the like are stored, a PF motor drive circuit 57, and an ASF motor drive circuit 58, and is controlled via input / output means such as an IO port (not shown). Various control commands output from the command unit 59 can be received. Note that the speed calculation unit 61, the position calculation unit 62, the PID control unit 63, and the heat generation restriction control unit 64 actually include a calculation unit such as a CPU, a storage unit such as a RAM and a nonvolatile memory, and an IO port. It consists of input / output means and the like.

  The speed calculation unit 61 calculates the current rotation speed of the PF motor 14 based on the input signal from the PF encoder 40 and calculates the current rotation speed of the ASF motor 31 based on the input signal from the ASF encoder 41. A signal corresponding to the rotation speed is output to the PID control unit 63 and the heat generation restriction control unit 64. The position calculation unit 62 calculates the current rotation distance of the PF motor 14 based on the input signal from the PF encoder 40 and calculates the current rotation distance of the ASF motor 31 based on the input signal from the ASF encoder 41. A signal corresponding to the rotation distance is output to the PID control unit 63 and the heat generation restriction control unit 64.

  The heat generation restriction control unit 64 calculates an estimated temperature (first estimated temperature) inside the PF motor 14 and an estimated temperature (second estimated temperature) inside the ASF motor 31. That is, from the information regarding the rotation speed of the PF motor 14 and the ASF motor 31 input from the speed calculation unit 61 and the information regarding the rotation distance of the PF motor 14 and the ASF motor 31 input from the position calculation unit 62, the PF motor 14. The estimated heat generation amount of the ASF motor 31 is specified, and the first estimated temperature and the second estimated temperature are calculated based on the specified estimated heat generation amount.

  Specifically, first, since the printing paper P is intermittently conveyed as will be described later, as shown in FIG. 5, the conveyance amount of the printing paper P during intermittent conveyance (that is, the PF motor 14 or ASF during intermittent conveyance). Estimated calorific value of the PF motor 14 or ASF motor 31 estimated from the rotation distance L1 of the motor 31) and the ultimate rotation speed of the PF motor 14 or ASF motor 31 (that is, the rotation speed during constant speed rotation) N1 etc. A calorific value reference table in which Q 1 and the like are tabulated is set for each motor and stored in the memory 53. The heat generation restriction control unit 64 specifies the estimated heat generation amounts of the PF motor 14 and the ASF motor 31 from the information from the speed calculation unit 61 after intermittent conveyance, the information from the position calculation unit 62, and the heat generation amount reference table. The first estimated temperature and the second estimated temperature are calculated every time the printing paper P is intermittently conveyed from the sum of the estimated calorific values. In calculating the first estimated temperature and the second estimated temperature, the elapsed time such as the rotation time of the PF motor 14 and the ASF motor 31 and the waiting time between intermittent conveyances is taken into consideration.

  Further, the heat generation restriction control unit 64 determines whether or not the calculated first estimated temperature is equal to or higher than a predetermined temperature. If the first estimated temperature is equal to or higher than the predetermined temperature, the PID control unit 63 is notified of the PF. A heat generation restriction signal (first heat generation restriction signal) of the motor 14 is output. When the first estimated temperature is lower than the predetermined temperature, the heat generation restriction control unit 64 outputs a heat generation restriction unnecessary signal (first restriction unnecessary signal) of the PF motor 14 to the PID control unit 63. Similarly, the heat generation restriction control unit 64 determines whether or not the calculated second estimated temperature is equal to or higher than a predetermined temperature. If the second estimated temperature is equal to or higher than the predetermined temperature, the process proceeds to the PID control unit 63. When the heat generation restriction signal (second heat generation restriction signal) of the ASF motor 31 is output and the second estimated temperature is lower than the predetermined temperature, the heat generation restriction unnecessary signal (second restriction unnecessary) of the ASF motor 31 is sent to the PID control unit 63. Signal).

  The heat generation restriction control unit 64 determines whether or not the calculated first estimated temperature or second estimated temperature has exceeded, and if the first estimated temperature or the second estimated temperature exceeds a predetermined temperature, PID control is performed. The first heat generation restriction signal and the second heat generation restriction signal are output to the unit 63, and when the first estimated temperature and the second estimated temperature are equal to or lower than a predetermined temperature, the PID control unit 63 receives the first restriction unnecessary signal and the second You may comprise so that a restriction unnecessary signal may be output.

  The PID control unit 63 first determines the difference between the target stop position and the current rotation distance from the target stop position corresponding to the next stop position of the printing paper P and the current rotation distance input from the position calculation unit 62. Calculate the position deviation. Further, the target rotational speed corresponding to the current rotational distance of the PF motor 14 or the ASF motor 31 is read from the target speed table stored in the memory 53 based on the position deviation signal, and the current rotational speed input from the speed calculation unit 61 is read. Then, a speed deviation which is a difference between the target rotational speed and the current rotational speed is calculated from the target rotational speed. Thereafter, a proportional control value, an integral control value, and a differential control value are calculated based on the speed deviation, and a PID control signal obtained by adding these is output to the PF motor drive circuit 57 and the ASF motor drive circuit 58.

  In addition, when the first heat generation restriction signal or the second heat generation restriction signal is input from the heat generation restriction control section 64, the PID control section 63 changes the target speed table read from the memory 53 as necessary to change the PF motor. 14, the first target reached rotational speed that is the target rotational speed at the constant speed is decreased, or the second target reached rotational speed that is the target rotational speed at the constant speed of the ASF motor 31 is decreased. In this manner, by reducing the target rotation speed, the load on the PF motor 14 and the ASF motor 31 is reduced, and heat generation of the PF motor 14 and the ASF motor 31 is suppressed. Details of the control when the first heat generation restriction signal and the second heat generation restriction signal are input to the PID controller 63 and the control when the first restriction unnecessary signal and the second restriction unnecessary signal are input will be described later. To do.

  The PF motor drive circuit 57 outputs a PWM drive signal for PWM control of the PF motor 14 by a signal from the PID control unit 63. Similarly, the ASF motor drive circuit 58 outputs a PWM drive signal for PWM control of the ASF motor 31 by a signal from the PID control unit 63.

  The control command unit 59 outputs a control command for intermittently transporting the printing paper P to the control unit 50. Specifically, the control command unit 59 controls the control command for intermittently transporting the printing paper P by a predetermined transport amount, and the rotational speed at the constant speed of the PF motor 14 and the ASF motor 31 during the intermittent transport. Is output to the control unit 50 in order to set the rotation speed to a predetermined reached rotational speed.

(Method of printing paper conveyance control)
FIG. 6 is a diagram illustrating a state in which the printing paper P is being conveyed during continuous printing in the draft printing mode. FIG. 7 is a table showing the relationship between the transport speed and the minimum transport amount of the printing paper P in the constant speed region of the PF drive roller 4 and the rear paper feed roller 27 shown in FIG.

  In this embodiment, during continuous printing in which printing is continuously performed on a plurality of printing papers P, printing paper P supplied from the rear side in a draft printing mode in which ink consumption is saved and high-speed printing is performed instead of reducing the resolution. When the printing paper P is intermittently transported after being transported from the paper feeding hopper 26 to the PF driving roller 4 by the rear paper feeding roller 27, the PF driving roller 4 and the paper ejection driving roller 6 are used. In addition, a rear paper feed roller 27 is used. That is, in the draft printing mode, the PF driving roller 4 and the paper discharge driving roller 6 driven by the PF motor 14 and the rear paper feeding roller 27 driven by the ASF motor 31 cooperate to perform printing by the carriage 3. During the operation, the printing paper P is intermittently conveyed. Therefore, during continuous printing in the draft printing mode, synchronized control is performed in which the PF drive roller 4, the paper discharge drive roller 6, and the rear paper feed roller 27 are rotated synchronously (that is, at the same peripheral speed). Printing paper P is continuously conveyed.

  Specifically, a speed profile indicating the relationship between the rotational distance of the PF drive roller 4 and the target peripheral speed (target transport speed of the printing paper P by the PF drive roller 4), the rotational distance of the rear paper feed roller 27, and the target peripheral speed. The target speed tables of the PF motor 14 and the ASF motor 31 are set so that the speed profile indicating the relationship with the speed (target conveyance speed of the printing paper P by the rear paper feed roller 27) is substantially the same, and the memory 53. The PF motor 14 and the ASF motor 31 are PID-controlled according to these target speed tables. During continuous printing in the draft printing mode, when one printing paper P is conveyed by both the PF driving roller 4 and the rear paper feeding roller 27, the activation timing of the PF motor 14 is activated by the activation of the ASF motor 31. It is later than the timing. Therefore, the printing paper P being transported is slack between the PF drive roller 4 and the rear paper feeding roller 27 as shown by a two-dot chain line in FIG. 6, and the printing paper P at the time of stopping is shown by a solid line in FIG. As shown, the slack is taken.

  In this embodiment, the first and second target rotation speeds when the PF motor 14 and the ASF motor 31 are actually driven (that is, printing in the constant speed region of the PF drive roller 4 and the rear paper feed roller 27). The target conveyance speed of the paper P) is set stepwise and individually for each of the PF motor 14 and the ASF motor 31. For example, for simplification of description, the resolution of the PF pulse signal (the rotational distance of the PF driving roller 4 per pulse of the PF pulse signal (that is, the transport amount of the printing paper P)) and the resolution of the ASF pulse signal (ASF) Assuming that the rotation distance of the rear paper feed roller 27 per pulse of the pulse signal (that is, the conveyance amount of the printing paper P) is the same, as shown in FIG. 7, the PF motor 14 and the ASF motor 31 are actually Each of the target transport speeds (target rotation speeds) when the motors are driven is set individually. More specifically, target speed tables corresponding to the first and second target attainment rotational speeds set in stages are stored in the memory 53, respectively.

  Note that the PF motor 14 and the ASF motor 31 according to the present embodiment have characteristics such that when the first and second target reaching rotational speeds of the PF motor 14 and the ASF motor 31 are predetermined rotational speeds (that is, PF driving rollers). 4 and when the target transport speed of the printing paper P in the constant speed region of the rear paper feed roller 27 is a predetermined speed), the PF motor 14 necessary for appropriately controlling the rotation of the PF motor 14 and the ASF motor 31, The minimum rotation distance of the ASF motor 31 (that is, the minimum transport amount of the print paper P by the PF drive roller 4 and the rear paper feed roller 27) is determined. For example, as shown in FIG. 7, if the minimum transport amount with respect to the target transport speed of the printing paper P in the constant speed region is determined and the target transport speed is 20 ips (inch per second), the intermittent transport of the printing paper P is performed. If the amount is not 100 pulses or more, the PF motor 14 and the ASF motor 31 cannot be appropriately controlled for rotation. In FIG. 7, for convenience of explanation, the relationship between the target conveyance speed and the minimum conveyance amount at the constant speed of the PF motor 14 and the relationship between the target conveyance speed and the minimum conveyance amount at the constant speed of the ASF motor 31 are shown. It is the same.

  As described above, the control command unit 59 of the present embodiment outputs a control command for setting the rotation speed at the constant speed of the PF motor 14 and the ASF motor 31 during intermittent conveyance to a predetermined reached rotation speed to the control section 50. To do. However, when the heat generation restriction control of the PF motor 14 or the ASF motor 31 is required, the rotation control of the PF motor 14 is performed at the first target reached rotation speed based on the control command from the control command unit 59, or the control command unit If the rotation control of the ASF motor 31 is performed at the second target reached rotation speed based on the control command from 59, the PF motor 14 and the ASF motor 31 cannot be prevented from being burned out. In addition, when the heat generation restriction control of either one of the PF motor 14 and the ASF motor 31 is necessary, if the control is performed by reducing only the target rotation speed of one of the motors, appropriate synchronization control cannot be performed.

  Therefore, in this embodiment, when at least one of the first estimated temperature and the second estimated temperature is equal to or higher than the predetermined temperature, regardless of the control command from the control command unit 59, during the next intermittent conveyance, In order to make the peripheral speed of the PF drive roller 4 and the peripheral speed of the rear paper feed roller 27 substantially the same, the rotational speed lower than the first target reaching rotational speed of the PF motor 14 at the previous intermittent conveyance is set to The rotation of the PF motor 14 is controlled as the first target arrival speed at the time of intermittent conveyance, and the rotation speed lower than the second target arrival speed of the ASF motor 31 at the time of the previous intermittent conveyance is set at the next intermittent conveyance. The ASF motor 31 is rotationally controlled as the second target reaching rotational speed at.

  For simplification of description, the first target reaching rotational speed of the PF motor 14 and the second target reaching rotational speed of the ASF motor 31 based on the control command from the control command unit 59 are constant during intermittent conveyance during continuous printing. More specifically, when at least one of the first heat generation restriction signal and the second heat generation restriction signal is input from the heat generation restriction control unit 64 to the PID control unit 63, the PID control unit 63 The flag is in an ON state, and the PID control unit 63 reads out a target speed table corresponding to a target reached rotational speed lower than the first target reached rotational speed corresponding to the target speed table read from the memory 53 at the previous intermittent conveyance. The rotation of the PF motor 14 is controlled, and the second target arrival time corresponding to the target speed table read from the memory 53 at the previous intermittent conveyance is obtained. It reads the target speed table corresponding to the lower target arrival rotation speed than the number, controls the rotation of the ASF motor 31. When the first restriction unnecessary signal and the second restriction unnecessary signal are input from the heat generation restriction control unit 64 and the flag is turned off by the PID control unit 63, the target speed table read from the memory 53 is restored (ie, Then, the target speed table based on the control command from the control command unit 59 is restored), and the PF motor 14 and the ASF motor 31 are rotationally controlled.

  Further, in this embodiment, when at least one of the first estimated temperature and the second estimated temperature calculated at each intermittent conveyance is equal to or higher than a predetermined temperature, the first target reaching rotational speed of the PF motor 14 and the ASF motor 31 The second target rotation speed is gradually reduced. For example, when the target conveyance speed corresponding to the first and second target reaching rotational speeds based on the control command from the control command unit 59 is 20 ips, at least one of the first estimated temperature and the second estimated temperature is predetermined. When the temperature is equal to or higher than the temperature, the first and second target reaching rotation speeds of the PF motor 14 and the ASF motor 31 at the next intermittent transfer are set to rotation speeds corresponding to the target transfer speed of 10 ips (see FIG. 7). In addition, when the target transport speed corresponding to the first and second target reaching rotational speeds during certain intermittent transport is 10 ips, when at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature The first and second target reaching rotational speeds at the time of the next intermittent transport are set to the rotational speeds corresponding to the target transport speed 5 ips (see FIG. 7).

  Further, when the target transport speed corresponding to the first and second target reaching rotational speeds is 5 ips (that is, when at least one of the first and second target reaching rotational speeds is the minimum value), the first When at least one of the estimated temperature and the second estimated temperature is equal to or higher than the predetermined temperature, it is assumed that an abnormal situation has occurred, the next intermittent conveyance is not performed, and the PF motor 14 and the ASF motor 31 are immediately stopped, Error processing such as displaying an error on a predetermined display unit is performed.

  In this embodiment, when the control signal is not detected by the control unit 50 within at a predetermined time, even though the synchro control is performed, the output signal from at least one of the PF encoder 40 and the ASF encoder 41 is not detected. The control unit 50 stops the PF motor 14 and the ASF motor 31.

(Control flow for transport control of printing paper)
FIG. 8 is a flowchart showing a procedure for controlling the conveyance of the printing paper P shown in FIG. Hereinafter, a procedure for controlling the conveyance of the printing paper P during continuous printing in the draft printing mode will be described. In the following, for simplification of description, as described above, the first target reaching rotational speed and the second target reaching rotational speed based on the control command from the control command unit 59 are determined during intermittent conveyance during continuous printing. It shall be constant.

  When a print command is input from the control command unit 59 to the control unit 50, the control unit 50 controls the rotation of the PF motor 14 at the first target reached rotational speed based on the command from the control command unit 59, and the control command The ASF motor 31 is rotationally controlled at the second target reached rotational speed based on the command from the unit 59, and the printing paper P is intermittently conveyed once (step S1). And it is judged by this intermittent conveyance whether printing on the last one printing paper P at the time of continuous printing was completed (step S2). When printing on the last sheet of printing paper P is completed, a paper discharge operation is performed, and printing control of the printing paper P, that is, conveyance control is completed.

  On the other hand, if the printing on the last sheet of printing paper P has not been completed, the heat generation restriction control unit 64 determines the first estimated temperature of the PF motor 14 and the ASF motor 31 after the intermittent conveyance in step S1. A second estimated temperature is calculated (step S3). Then, the heat generation restriction control unit 64 determines whether or not the first estimated temperature and the second estimated temperature are equal to or higher than a predetermined temperature (step S4). When the first estimated temperature and the second estimated temperature are less than the predetermined temperature, the PID control unit 63 sets the first and second target reached rotational speeds based on the control command from the control command unit 59 during the next intermittent conveyance. (Step S5), the process returns to step S1. That is, when the first estimated temperature and the second estimated temperature are lower than the predetermined temperature, the heat generation restriction control unit 64 outputs the first restriction unnecessary signal and the second restriction unnecessary signal, and the PID control unit 63 stores the memory. The target speed table read from 53 is used as a target speed table based on the control command from the control command unit 59, and the process returns to step S1.

  In step S4, when at least one of the first estimated temperature and the second estimated temperature is equal to or higher than the predetermined temperature, the heat generation restriction control unit 64 outputs the first heat generation restriction signal and / or the second heat generation restriction signal. The PID control unit 63 determines whether or not the first and second target reaching rotational speeds at the previous intermittent conveyance are minimum values (step S6). If the first and second target reaching rotational speeds during the previous intermittent transport are not the minimum values, the PID control unit 63 sets the rotational speed lower than the first and second target reaching rotational speeds during the previous intermittent transport. Are set as new first and second target rotation speeds during the intermittent conveyance (step S7), and the process returns to step S1. That is, when at least one of the first estimated temperature and the second estimated temperature is equal to or higher than the predetermined temperature, the PID control unit 63 uses the target speed table read from the memory 53 as the first intermittent transport during the previous intermittent conveyance. Then, the process returns to step S1 as a target speed table in which a lower rotation speed than the second target arrival rotation speed is used as the first and second target arrival rotation speeds. For example, if the target transport speed corresponding to the first and second target reaching rotational speeds at the time of the previous intermittent transport is 20 ips, the first and second target reaching rotational speeds corresponding to 10 ips are set in step S7. Are set as new first and second target reaching rotational speeds during intermittent conveyance.

  On the other hand, when the first and second target reaching rotational speeds are the minimum values, error processing such as immediately stopping the PF motor 14 and the ASF motor 31 and displaying an error on a predetermined display unit is performed ( Step S8), the printing control of the printing paper P, that is, the conveyance control is finished.

  In this embodiment, in step S1, the PF drive roller 4 and the rear paper feed roller 27 are rotated at substantially the same peripheral speed, and the PF drive roller 4 and the rear paper feed roller 27 cooperate to feed paper. This is a transport step for intermittently transporting the printing paper P supplied from the hopper 26. Step S3 calculates a first estimated temperature inside the PF motor 14 and a second estimated temperature inside the ASF motor 31 after intermittent transport. This is a temperature calculation step. In step S7, when at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature, the peripheral speed of the PF driving roller 4 and the rear sheet feeding roller 27 are changed during the next intermittent conveyance. A rotation speed lower than the first target arrival rotation speed of the PF motor 14 at the previous intermittent conveyance is set as the first target arrival rotation speed at the next intermittent conveyance so that the peripheral speed becomes substantially the same. This is a rotation speed setting step for setting a rotation speed lower than the second target arrival rotation speed of the ASF motor 31 at the previous intermittent conveyance as the second target arrival rotation speed at the next intermittent conveyance.

(Main effects of this form)
As described above, in this embodiment, during continuous printing in the draft printing mode, the peripheral speed of the rear paper feed roller 27 that conveys the printing paper P in cooperation with the PF drive roller 4 and the peripheral speed of the PF drive roller 4. Are controlled so that the rotation speeds of the PF motor 14 and the ASF motor 31 are substantially the same. Therefore, the PF drive roller 4 and the rear paper feed roller 27 can be rotated in synchronization, and the printing paper P supply operation can be performed without hindering the discharge operation and printing operation of the printing paper P. . That is, since the printing operation, the discharge operation, and the supply operation can be performed as a series of operations, the throughput can be further improved during continuous printing. Further, since the PF drive roller 4 and the rear paper feed roller 27 can be rotated in synchronization, the printing paper P can be appropriately conveyed between the PF drive roller 4 and the rear paper feed roller 27. As a result, it is possible to suppress generation of sound of the printing paper P that may occur during conveyance due to a change in tension applied to the printing paper P.

  In this embodiment, the first estimated temperature inside the PF motor 14 and the second estimated temperature inside the ASF motor 31 after intermittent conveyance of the printing paper P are calculated, and at least one of the first estimated temperature and the second estimated temperature is calculated. When one of them reaches a predetermined temperature or more, the first speed in the previous intermittent transport is set so that the peripheral speed of the PF drive roller 4 and the peripheral speed of the rear paper feed roller 31 are substantially the same in the next intermittent transport. The rotation speed of the PF motor 14 is controlled so that the rotation speed lower than the target arrival rotation speed is the first target arrival rotation speed at the next intermittent conveyance, and the rotation speed is lower than the second target arrival rotation speed at the previous intermittent conveyance. The ASF motor 31 is rotationally controlled with the second target reaching rotational speed at the time of the next intermittent conveyance. Therefore, when the first estimated temperature or the second estimated temperature reaches a predetermined temperature and the heat generation restriction control is required, the PF motor 14 and the ASF motor 31 are reduced together to reduce the target reaching rotational speed. 14 and the ASF motor 31 can be rotated while the PF drive roller 4 and the rear paper feed roller 27 are appropriately synchronized while suppressing heat generation.

  In the present embodiment, the first and second target reaching rotational speeds are set individually and stepwise for each of the PF motor 14 and the ASF motor 31, and at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature. The first and second target attainment rotational speeds are lowered step by step. Therefore, while suppressing the heat generation of the PF motor 14 and the ASF motor 31, the PF driving roller 4 and the rear paper feeding roller 27 can be appropriately synchronized, and the printing paper P is transported at the fastest possible transport speed. Is possible.

  In the present embodiment, when the first and second target reaching rotational speeds during the intermittent conveyance are the minimum values, when at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature, Intermittent conveyance is not performed, and the PF motor 14 and the ASF motor 31 are immediately stopped. When the first estimated temperature and the second estimated temperature are equal to or higher than the predetermined temperature despite the first and second target reaching rotational speeds being the minimum value, while suppressing the heat generation of the PF motor 14 and the ASF motor 31, It is difficult to rotate the PF drive roller 4 and the rear paper feed roller 27 while appropriately synchronizing them. Therefore, with this configuration, it is possible to prevent damage to the printing paper P and generation of sound due to the printing paper P, while preventing the PF motor 14 and the ASF motor 31 from being burned out.

  In the present embodiment, when the control signal is not detected by the control unit 50 within a predetermined time, even if the sync control is performed, the PF motor 14 and the ASF motor 31 are stopped. When the control unit 50 cannot detect the output signals from the PF encoder 40 and the ASF encoder 41, an abnormal situation has occurred. With this configuration, it is possible to prevent clogging of the printing paper P and damage to the inside of the printer 1. .

(Other embodiments)
In the above-described embodiment, for the sake of simplification of explanation, the procedure for controlling the conveyance of the printing paper P is described by taking the case where the first and second target reaching rotation speeds based on the control command are constant as an example. When the first and second target reaching rotation speeds vary based on the control command during conveyance, the conveyance control of the printing paper P may be performed as follows. That is, after step S6 described above, are the first and second target reaching rotational speeds based on the control command during the next intermittent conveyance lower than the first and second target reaching rotational speeds during the previous intermittent conveyance? Judge whether or not. When the first and second target reaching rotational speeds based on the control command at the next intermittent conveyance are lower than the first and second target reaching rotational speeds at the previous intermittent conveyance, the first based on the control command 1. The second target reaching rotational speed is directly used as the target reaching rotational speed at the next intermittent transport, and the first and second target reaching rotational speeds based on the control command at the next intermittent transport are the first target rotational speed at the previous intermittent transport. 1. If the rotation speed is equal to or higher than the second target reaching rotation speed, the PF motor has a rotation speed lower than the first and second target reaching rotation speeds during the previous intermittent conveyance as the target arrival rotation speed during the next intermittent conveyance. 14. The ASF motor 31 may be controlled.

  In the above-described form, when the first estimated temperature and the second estimated temperature are less than the predetermined temperature in step S4, the first and second target reached rotational speeds based on the control command from the control command unit 59 are set as follows. The target rotational speed at the time of intermittent conveyance is set, and the process returns to step S1. In addition to this, for example, when at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature and the first and second target reaching rotational speeds are lowered stepwise, the step In S4, when the first and second estimated temperatures are lower than the predetermined temperature, the first and second target reaching rotational speeds may be increased stepwise. For example, when the target transport speed based on the control command is 20 ips and the target transport speed corresponding to the first and second target reaching rotational speeds at the previous intermittent transport is 5 ips, in step S4, When the first and second estimated temperatures are lower than the predetermined temperature, the target transport speed corresponding to the first and second target rotation speeds may be increased to 10 ips.

  In the above-described form, when the first and second estimated temperatures are equal to or higher than the predetermined temperature, the rotational speed lower than the first and second target reaching rotational speeds at the previous intermittent transport is set to the first intermittent transport at the next intermittent transport. 1. The rotation of the PF motor 14 and the ASF motor 31 is controlled as the second target reached rotational speed. In addition to this configuration, for example, due to mechanical load fluctuations and disturbances, the reached rotational speed of the PF motor 14 calculated by the speed calculation unit 61 does not reach a predetermined ratio of the first target reached rotational speed. And / or the PF motor 14 and the ASF motor at the time of the next intermittent conveyance when the reaching rotational speed of the ASF motor 31 calculated by the speed calculation unit 61 does not reach a predetermined ratio of the second target reaching rotational speed. It is also possible to perform the synchro control by reducing the target rotation speed of 31 together.

  The first and second estimated temperatures calculated by the heat generation restriction control unit 64 are configured so that the control unit 50 outputs to the control command unit 59, and in a predetermined case, the control command unit 59 A control command may be output to the control unit 50 that sets the rotation speed lower than the first and second target reaching rotation speeds as new first and second target reaching rotation speeds.

1 is a side view showing a schematic configuration of a main part of a printer according to an embodiment of the present invention. The figure which shows typically schematic structure of drive parts, such as PF drive roller of FIG. The figure for demonstrating operation | movement of the paper feed hopper of FIG. 1, and a retard roller. The block diagram which shows schematic structure of the control part of FIG. 2, and its peripheral device. The table | surface which shows an example of the emitted-heat amount reference table memorize | stored in the memory of FIG. The figure which shows the state in which the printing paper is conveyed at the time of the continuous printing in draft printing mode. 2 is a table showing a relationship between a conveyance speed and a minimum conveyance amount of a printing sheet in a constant speed region of the PF driving roller and the rear sheet feeding roller of FIG. 6 is a flowchart illustrating a procedure of print sheet conveyance control according to the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Printer, 4 PF drive roller (conveyance roller), 14 PF motor (conveyance motor), 26 Paper feed hopper (medium setting part), 27 Rear paper feed roller (supply roller), 31 ASF motor (supply motor), 40 PF Encoder (first encoder), 41 ASF encoder (second encoder), 50 control unit, P printing paper (printing medium), S1 transport step, S3 temperature calculation step, S7 rotation speed setting step.

Claims (5)

A transport roller capable of intermittently transporting the print medium supplied from a medium setting unit on which a print medium before printing is set, a transport motor for driving the transport roller, and supplying the print medium from the medium setting unit And a supply roller capable of intermittently conveying the print medium supplied from the medium setting unit in cooperation with the conveyance roller, a supply motor for driving the supply roller, and a peripheral speed of the conveyance roller. A controller that controls the rotation speed of the feed motor and the supply motor so that the peripheral speed of the supply roller is substantially the same;
The control unit calculates a first estimated temperature inside the conveyance motor and a second estimated temperature inside the supply motor after intermittent conveyance of the print medium, and at least the first estimated temperature and the second estimated temperature. When one of the temperatures becomes equal to or higher than a predetermined temperature or exceeds a predetermined temperature, the peripheral speed of the transport roller and the peripheral speed of the supply roller are substantially the same during the next intermittent transport. The conveyance motor is rotationally controlled with the rotation number lower than the first target arrival rotation number of the conveyance motor at the time of conveyance as the first target arrival rotation number at the time of the next intermittent conveyance, and the above-mentioned at the time of the last intermittent conveyance A printer characterized in that the supply motor is rotationally controlled with a rotation speed lower than a second target arrival rotation speed of the supply motor as a second target arrival rotation speed at the next intermittent conveyance. The first target reaching rotational speed and the second target reaching rotational speed are individually and stepwise set for each of the transport motor and the supply motor,
When at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature or exceeds a predetermined temperature, the control unit determines the first target reaching rotational speed and the second target reaching. 2. The printer according to claim 1, wherein the rotational speed is decreased stepwise.   When the first target reaching rotational speed and / or the second target reaching rotational speed at the time of transporting the print medium is a minimum value, the control unit is configured to output at least the first estimated temperature and the second estimated temperature. 3. The printer according to claim 2, wherein when any one of the temperature exceeds a predetermined temperature or exceeds a predetermined temperature, the transport motor and the supply motor are stopped. A first encoder connected to the control unit and capable of detecting the rotational speed of the transport motor; and a second encoder connected to the control unit and capable of detecting the rotational speed of the supply motor;
The control unit stops the transport motor and the supply motor when an output signal from at least one of the first encoder and the second encoder cannot be detected. Printer. Driven by a transport motor and transported by a transport roller for transporting the print medium supplied from a medium set unit on which a print medium before printing is set, and supplied by a supply motor to supply the print medium from the medium set unit A conveying step of rotating the roller at substantially the same peripheral speed, and intermittently conveying the print medium supplied from the medium setting unit in cooperation with the conveying roller and the supply roller;
A temperature calculating step for calculating a first estimated temperature inside the conveying motor and a second estimated temperature inside the supply motor after intermittent conveyance of the printing medium in the conveying step;
When at least one of the first estimated temperature and the second estimated temperature is equal to or higher than a predetermined temperature or exceeds a predetermined temperature, the peripheral speed of the transport roller and the peripheral speed of the supply roller during the next intermittent transport The first target reaching rotational speed of the transport motor in the next intermittent transport is set to a lower rotational speed than the first target rotational speed of the transport motor in the previous intermittent transport so that the speed is substantially the same. , And a rotation speed setting that sets a rotation speed lower than the second target arrival rotation speed of the supply motor at the previous intermittent conveyance as the second target arrival rotation speed of the supply motor at the next intermittent conveyance And a printer control method.

Images