JP3092684U - Printer motor drive controller - Google Patents

Abstract

(57) [Problem] To solve the problem of the power supply unit such as unstable output and intermittent oscillation when a large load is applied, and to ensure smooth operation of the carriage. When a control output value of a carriage motor exceeds a duty of 85%, a CPU limits the upper limit of the control output value to 85% and continues the PWM voltage control. 30msec by
And the control output value is still 8 after the measurement of 30 msec.
If the voltage remains at 5%, the upper limit of the control output value is limited to 70% by duty at that time, and the PWM voltage control is continued, and the second time (70 msec) is measured by the time measuring unit 22 from that time. If the control output value becomes 70% or less before this 70 msec measurement, P
If the control output value remains 70% after the measurement of 70 msec while the WM voltage control is continued, it is determined that an error has occurred at that point, and the carriage motor 18 is stopped.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention is a power supply unit for a DC motor that drives a carriage equipped with a print head. Control means that is firmware that supplies a voltage from the controller and is driven by PWM voltage control The present invention relates to a motor drive control device of a printer including the.

[0002]

[Prior art]

  In conventional serial printers, etc., drive a carriage equipped with a print head. A type that uses a stepping motor as a moving drive source (for example, (See Patent Document 1) and a type that uses a DC motor (for example, see Patent Document 2). There is).

[0003]   Also, the drive of the carriage is controlled by PWM voltage control using a DC motor. There are also some (see, for example, Patent Documents 3 and 4).

[0004]

[Patent Document 1]   JP-A-5-50616

[Patent Document 2]   Japanese Patent Laid-Open No. 6-91977

[Patent Document 3]   Japanese Patent Laid-Open No. 2000-102282

[Patent Document 4]   JP-A-6-284777

[0005]

[Problems to be solved by the device]

  By the way, in the conventional printer, due to the problem of storage space, there is also a power supply unit. Downsizing is required. Therefore, the power supply unit installed in the printer Performance is based on the maximum load of the entire set including the DC motor installed in the printer. In some cases, it was limited to the minimum required. Therefore, for the entire set If the maximum load is slightly higher than originally planned, performance will be Since the built-in power supply unit is installed, a large load is applied to the power supply unit for output Becomes unstable, and problems such as intermittent oscillation occur in some cases.

[0006]   This problem is one rank higher than the power supply unit if there is no space constraint. It can be solved by using ones, but one rank higher inevitably has a larger size In some cases, it may not be possible to install the printer in a space-constrained printer. Therefore, in conventional printers, due to space issues, A situation arises in which there is no choice but to use a power supply unit that does not have much room.

[0007]   Therefore, if the printer is equipped with a power supply unit that does not have enough output, When a large load is applied to the unit, the output becomes unstable as described above and intermittent It was necessary to take some measures so as not to oscillate.

[0008]   In this case, in order to avoid intermittent oscillation of the power supply unit, PWM of the DC motor In voltage control, the duty of the drive voltage is 100% (that is, the ON time is 1 Set a limit limit so that the off time is 0% at 0%). You can take measures with and. For example, the duty of the drive voltage is 70% (that is, the ON time Is 70% and the off time is 30%), the output becomes stable and intermittent oscillation occurs. It can be prevented.

[0009]   However, if the drive voltage duty is limited to 70% in this way, For example, move the carriage from the home position to the print start position. Therefore, the moment the DC motor is started, a large load is applied to the power supply unit, The duty of the dynamic voltage may reach nearly 85%. Therefore, simply 7 If the limit was limited to 0%, it would be Limits are applied even at the moment, so the original way to drive the carriage is Despite the normal start-up operation, it was determined that there was a set error such as a carriage stall. Problems such as being cut off occur.

[0010]   The present invention was devised to solve such problems, and its purpose is to provide a printer. The performance of the power supply unit installed in the is the maximum load of the entire set including the DC motor. If the power supply unit is limited to the minimum necessary By improving the parts that do not reach the target with software instead of hardware , The output becomes unstable when a large load is applied and intermittent oscillation occurs. The problem of knit is solved, and the carriage slides when starting up the DC motor. It is an object of the present invention to provide a motor drive control device for a printer that ensures a smooth operation.

[0011]

[Means for Solving the Problems]

  A motor drive control device of a printer according to the present invention is a printer equipped with a print head. By supplying voltage from the power supply unit to the DC motor that drives the ridge, PWM voltage control The power supply unit is equipped with a control unit that is firmware to drive, The minimum required to support the maximum load of the entire set including the DC motor A limited motor drive control device for a printer, the output of the DC motor A measuring unit for measuring the time limit is provided, and during the printing operation, the control unit Output limit value is set internally, and the control output value of the DC motor is set to the first output control value. When the limit value is exceeded, the upper limit of the control output value of the DC motor is set to the first output control value. The PWM voltage control is continued by limiting to the limit value, and the measuring means is started from that point. Means for measuring a first time which is an output time limit of the DC motor, and Even after the measurement of the first time, the control output value of the DC motor remains within the first output limit value. If there is up to, the upper limit of the control output value of the DC motor at that time When the PWM voltage control is continued by limiting to the second output limit value lower than the control output value. At the same time, from the time point, the measuring means is the output limit time of the DC motor. 2 means for measuring the time, and the control output of the DC motor before the second time measurement. When the force value becomes less than the second output limit value, the PWM voltage control is continued as it is. And a control output value of the DC motor after the measurement of the second time If the output limit value of 2 still remains, it is determined that an error has occurred at that point and the DC And a means for stopping the data.

[0012]   Here, the first output limit value is set to the DC mode when the carriage starts to move. The carriage is set to a value that allows normal operation in consideration of the load applied to the motor. , The second output limit value of the power supply unit in consideration of the DC motor. It is set to a value before the output voltage becomes unstable. Specifically, for example, the first The output control value is set to duty 85%, and the second output control value is set to duty 70%. It is set to%. However, these values depend on the performance of the power supply unit and Arbitrary in consideration of the maximum load of the entire set including the DC motor of the mounted printer You can set it to.

[0013]   In addition, the first time is the time when the DC motor is started as the carriage accelerates. Rise time is set to be included, and the second time is set to the DC motor. The time before the output voltage of the power supply unit becomes unstable and intermittent oscillation occurs due to a tradeoff Is set to. Specifically, for example, the first time is set to 30 msec, The second time is set to 70 msec. However, in the first time, DC mode It may be set in consideration of the overshoot time at the start of the The time may be set in consideration of the time until the power supply unit oscillates intermittently. Well In addition, 100 msec, which is the total time of the first time and the second time, is If a carriage error occurs, this carriage error can be confirmed with certainty. It is also time to go.

[0014]   As described above, according to the motor drive control device of the printer of the present invention, The performance of the power supply unit installed in the controller is the maximum load of the entire set including the DC motor. Power supply unit is limited to the minimum necessary To improve the parts that are out of reach with software rather than hardware Output becomes unstable and intermittent oscillation occurs when a large load is applied. At the same time as solving the problem of the power supply unit, the capacity at the time of starting the DC motor It is possible to ensure smooth operation of the ridge.

[0015]

[Embodiment of device]

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0016]   FIG. 1 is a system configuration diagram of a printer equipped with the motor drive control device of the present invention. is there.

[0017]   This printer 1 is a personal computer (upper host computer Printing operation based on various commands and print data supplied from It is configured to do. Therefore, bidirectional communication between the personal computer 2 and the printer 1 is possible. It is connected via a possible communication cable 3.

[0018]   The printer 1 includes an ASIC 11, which is a logic circuit IC configured exclusively for the printer. , And a CPU 12 which is firmware for controlling this. CPU12 Includes a ROM 13 in which a program for executing a printing operation is stored, and various R that stores commands and data, and also serves as a work area during printing AM14 is connected respectively.

[0019]   The ASIC 11 has a feed motor for feeding a recording sheet (not shown) to the printing position. A feed motor drive unit 15 for controlling the drive of 16 ejects ink onto the fed recording paper. A print head 19 that prints data by shooting, a diagram in which the print head 19 is mounted Reciprocate the carriage (not shown) in the direction perpendicular to the recording paper feed direction. Motor for driving and controlling a carriage motor 18 which is a DC motor for The drive unit 17, the speed detection unit 20 that detects the moving speed of the carriage, the power is turned on / off. A key input unit 21 having a power key (not shown) for turning off and measuring various times. The time measuring units 22 are connected to each other. ASIC 11 from CPU 12 Control the feed motor drive unit 15 and the carriage motor drive unit 17. Control the feed motor 16 and carriage motor 18 respectively. Both control the printing operation by the print head 19.

[0020]   In addition, the carriage motor drive unit 17 controls the CPU 12 and the ASIC 11. Therefore, the carriage motor 18 is set to the PWM voltage based on the detection result of the speed detection unit 20. The drive is controlled by the control. Regarding the PWM voltage control itself Is a conventionally well-known control method, and detailed description thereof is omitted here.

[0021]   Further, the ASIC 11, the CPU 12, the RAM 14, the feed motor drive unit 15, The carriage motor drive unit 17, the print head 19, the time measuring unit 22, etc. Power is supplied from the unit 25.

[0022]   Here, the performance of the power supply unit 25 mounted on the printer 1 is the same as that of this embodiment. In the state, the maximum load of the entire set including the carriage motor 18 which is a DC motor On the other hand, it is limited to the minimum required performance that can be supported. That is, If the maximum load for the entire Since the power supply unit 25 is installed at the very limit, the power supply unit 25 has a large Including the possibility that output becomes unstable due to load and intermittent oscillation may occur. I'm out.

[0023]   Here, the ROM 13 stores the first output limit value and the second output limit value in advance. Has been done. The first output limit value is the carriage motor when the carriage starts moving. In consideration of the load applied to 18, the carriage is set to a value that allows normal operation. The output limit value of 2 is output from the power supply unit 25 in consideration of the carriage motor 18. It is set to a value before the output voltage becomes unstable. Specifically, for example, the first output The force control value is set to 85% duty and the second output control value is 70% duty. Is set to. However, these values depend on the performance of the power supply unit 25 and Combined with the maximum load of the set including the carriage motor 18 of the installed printer 1. It may be set arbitrarily depending on the situation.

[0024]   Further, the CPU 12 is stored in the ROM 13 when the carriage motor 18 is driven. The first output limit value (duty 85%) is set to When the control output value of the controller 18 exceeds the first output limit value due to the acceleration of the carriage. Is the upper limit of the control output value of the carriage motor 18 at that time. The PWM voltage control is continued by limiting the The first time is measured, and the carriage motor 18 is controlled even after the first time is measured. If the force value remains at the first output limit value, then the carriage motor 1 The upper limit of the control output value of No. 8 is the second output limit value (due to 70%) and continue PWM voltage control, and from that time The second time is measured by the measuring unit 22, and the carriage motor is measured before the second time is measured. When the control output value of 18 becomes less than or equal to the second output limit value, the carriage remains as it is. While continuing the PWM voltage control of the motor 18 as usual, after the second time measurement, If the control output value of the carriage motor 18 remains the second output limit value, At the point of time, it is judged that the carriage error and the carriage motor 18 is stopped.

[0025]   Here, the first time is the time when the carriage motor 18 stands up due to the acceleration of the carriage. Second time set to include rise time (eg 10 msec) The output voltage of the power supply unit 25 is unstable due to the balance with the carriage motor 18. Is set to the time before intermittent oscillation. Specifically, for example, the first time The interval is set to 30 msec, and the second time is set to 70 msec. Was However, during the first time, there is no overshoot when the carriage motor 18 starts up. It may be set in consideration of time, etc., and the power supply unit 25 intermittently oscillates during the second time. It may be set in consideration of the time until it is performed. Also, the time between the first time and the second time The total time of 100 msec is set when the carriage error occurs. It is also the time to check the carriage error.

[0026]   Next, the drive of the carriage motor 18 at the start of the printing operation by the printing device having the above-mentioned configuration An example of dynamic control will be described with reference to the flowchart shown in FIG. In addition, RO The first output limit value stored in M13 is set to a duty of 85%, and the second output is set. The limit value is 70% duty. In addition, the first time is set to 30 msec and the second time is set to 30 msec. Is set to 70 msec.

[0027]   The CPU 12 is in a power-on state when a power key (not shown) of the printer 1 is operated. Then, the printing operation is on standby. In this state, the page from PC 2 When the load command is sent, C which received this paper load command The PU 12 controls the feed motor drive unit 15 to perform pick operation and skew adjustment operation. Work, TOF operation, fast feed operation (these operations are well known in the art. Therefore, the description will be omitted) and the recording paper is set at the print start position. After that, the data transmitted from the personal computer 2 is transferred to the ASIC 11 not shown in the figure. When it is stored in the file, the printing operation is started.

[0028]   At the start of such a printing operation, the CPU 12 is stored in the ROM 13. The first output limit value of duty 85% is set internally (step S1). ), The control output value of the carriage motor 18 is the first output limit value. It is constantly monitored whether it exceeds 85% (step S2).

[0029]   Then, the carriage moves from the home position to the print start position, for example. As a result of the heavy load on the carriage motor 18, as when starting The duty ratio of the control output value of the carriage motor 18 is 85%, which is the first output limit value. When it exceeds (when it is determined as Yes in step S2), the CPU 12 determines that The upper limit of the control output value of the carriage motor 18 is limited to the first output limit value (85%). Then, the PWM voltage control is continued (step S3). At the same time, the CPU 12 The time measuring unit 22 causes the first time (the output time limit of the carriage motor 18) ( Measurement of 30 msec) is started (step S4). And this 30msec During measurement, the control output value of the carriage motor 18 is less than the first output limit value (85%). It is confirmed whether it remains as it is (steps S5 and S6).

[0030]   As a result, before 30 msec has elapsed, the control output value of the carriage motor 18 Is below the upper limit of 85% (No in step S5, No in step S6 (If determined), the load of the carriage motor 18 is transient such as rising. Since it can be judged that it was a load, in this case, the normal PWM voltage The control is continued (step S7).

[0031]   On the other hand, even if 30 msec has elapsed, the control output value of the carriage motor 18 remains at the upper limit. If it remains 85% (Yes in Step S6, Yes in Step S5) If so, the upper limit of the control output value of the carriage motor 18 at that time is Limit to the second output limit value (70%) lower than 85% of the first control output value so far Then, the PWM voltage control is continued (step S8). At the same time, the CPU 12 , Once the time measuring unit 22 is cleared and then the next output of the carriage motor 18 is restricted. The measurement of the second time (70 msec) which is the interval is started (step S9). That During this 70 msec measurement, the control output value of the carriage motor 18 is the second output value. It is confirmed whether the force limit value (70%) remains (steps S10 and S11). ).

[0032]   As a result, before 70 msec has passed, the control output value of the carriage motor 18 Is below 70% of the upper limit (No in step S10, N in step S11) If it is determined to be o), the occurrence of intermittent oscillation due to overload of the power supply unit 25 Since it can be judged that the possibility has disappeared, in this case, the normal PW The M voltage control is continued (step S7).

[0033]   On the other hand, even if 70 msec has elapsed, the control output value of the carriage motor 18 remains at the upper limit. If it remains 70% (Yes in step S11, Yes in step S10) (If determined), it is determined that the carriage is abnormal at that time, and the carriage mode is The control output value of the motor 18 is set to 0 (that is, the duty is 0%), and the carriage mode is set. The printer 18 is stopped (step S12), and the carriage stall error state is reached. (Step S13).

[0034]

[Effect of device]   According to the motor drive control device of the printer according to the present invention, it is installed in the printer. The performance of the power supply unit is the whole set including the carriage motor which is a DC motor. In the case of being limited to the minimum necessary amount that can handle the maximum load of , The part of the power supply unit that is not reached is modified by software instead of hardware. By doing well, the output becomes unstable and intermittent oscillation occurs when a large load is applied. The problem of the power supply unit such as It is also possible to ensure smooth movement of the carriage when it is bent. In addition, When the ridge is really abnormal, the key should be pressed after the first time and the second time. It is possible to surely stop the carriage.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a printer equipped with a motor drive control device of the present invention.

FIG. 2 is a flowchart for explaining drive control of a carriage motor when a printing operation is started by the printing apparatus.

[Explanation of symbols]

1 printer 2 External device (PC) 3 communication cable 11 ASIC 12 CPU 13 ROM 14 RAM 15 Feed motor drive 16 Feed motor 17 Carriage motor drive 18 Carriage motor 19 print head 20 Speed detector 21 Key input section 22 hours measurement section 25 power supply unit

Claims (4)

[Scope of utility model registration request] 1. A PWM is provided by supplying a voltage from a power supply unit to a DC motor for driving a carriage having a print head.
A motor drive control of a printer, which comprises a control unit which is firmware driven by voltage control, and the performance of the power supply unit is limited to a minimum necessary amount capable of supporting the maximum load of the entire set including the DC motor. In the device, the first output limit value is set to a value at which the carriage can normally operate in consideration of a load applied to the DC motor at the start of movement of the carriage, and the second output limit value is lower than the first output limit value. Is set to a value before the output voltage of the power supply unit becomes unstable due to the balance with the DC motor and intermittent oscillation occurs, and the first time is set to rise of the DC motor as the carriage accelerates. The time including the time is taken as the second time until the output voltage of the power supply unit becomes unstable due to the balance with the DC motor and intermittent oscillation occurs. When the printing operation is performed, the control means sets the first output limit value to the inside, and the measuring means measures the first time and the second time. When the control output value of the DC motor exceeds the first output limit value, the upper limit of the control output value of the DC motor is limited to the first output limit value to continue the PWM voltage control, and at that time point. From the means for measuring the first time by the measuring means, and when the control output value of the DC motor remains the first output limit value after the measurement of the first time, And a means for limiting the upper limit of the control output value of the DC motor to the second output limit value to continue the PWM voltage control, and measuring the second time from the time point by the measuring means. 2 before measuring the time A means for continuing the PWM voltage control when the control output value of the DC motor becomes equal to or lower than the second output limit value; and a control output value of the DC motor after the second time is measured. A motor drive control device for a printer, characterized in that, when the output limit value of 2 remains, it is judged to be an error at that time and the DC motor is stopped. 2. A PWM is provided by supplying a voltage from a power supply unit to a DC motor that drives a carriage equipped with a print head.
A motor drive control of a printer, which comprises a control unit which is firmware driven by voltage control, and the performance of the power supply unit is limited to a minimum necessary amount capable of supporting the maximum load of the entire set including the DC motor. The apparatus is provided with a measuring unit for measuring the output limit time of the DC motor, and during the printing operation, the control unit internally sets a first output limit value to control output value of the DC motor. Exceeds the first output limit value, the upper limit of the control output value of the DC motor is limited to the first output limit value and the PWM voltage control is continued, and from that time point, the measuring means performs the operation. Means for measuring a first time, which is an output time limit of the DC motor, and the control output value of the DC motor remains the first output power limit value after the measurement of the first time. In that case, the upper limit of the control output value of the DC motor is limited to a second output limit value lower than the first control output value at that time to continue the PWM voltage control, and the measurement is performed from that time. Means for measuring a second time which is an output time limit of the DC motor by means, and a control output value of the DC motor becomes equal to or less than the second output power limit value before the second time is measured. Means for continuing the PWM voltage control as it is, and if the control output value of the DC motor remains the second output limit value even after the measurement of the second time, it is judged as an error at that time. And a means for stopping the DC motor, the motor drive control device for the printer. 3. The first output limit value is set to a value at which the carriage can normally operate in consideration of the load applied to the DC motor at the start of movement of the carriage,
The motor drive of the printer according to claim 2, wherein the second output limit value is set to a value before the output voltage of the power supply unit becomes unstable in consideration of the DC motor. Control device. 4. The first time is set so as to include a rising time of the DC motor due to acceleration of the carriage, and the second time is set in consideration of the DC motor. 3. The motor drive control device for a printer according to claim 2, wherein the output voltage is set to a time before becoming unstable and causing intermittent oscillation.