JPS63157698A - Motor speed controlling system for printer - Google Patents

Abstract

PURPOSE:To prevent a large variation of load applied to a pulse motor by passing a constant-speed area certainly on the way of shifting from acceleration or deceleration to deceleration or acceleration. CONSTITUTION:A print head 1, a pulse motor 2, a control section 3, and a paper feed mechanism 4 are arranged, and the print head 1 is moved by the pulse motor 2. The control section 3 is provided with a speed control section, a paper feed control section, and a data processing section, and the speed of the pulse motor 2 is controlled, and the paper feed mechanism 4 is controlled, and data are processed. When the motor 2 is shifted from acceleration to deceleration, the control section 3 provides a constant-speed area between the acceleration area of the motor speed and the deceleration area.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a motor speed control method for a printing device that uses a pulse motor to move a print head, and in particular, to a printing device that can improve printing speed. This invention relates to a motor speed control method.

[Prior art]

Conventionally, in a printing device using a pulse motor.

Complex speed control is performed to improve printing speed.

For example, in the method described in Japanese Unexamined Patent Publication No. 60-141578, the feeding speed of the print head in the space portion is increased in order to improve the printing speed.

With this method, due to the number of spaces between characters, the pulse motor starts to decelerate mid-acceleration, and a large load may be applied to the pulse motor. Therefore, it is not possible to perform large accelerations and decelerations. requires a motor with large torque.

[Problem that the invention seeks to solve]

In the above conventional technology, when accelerating or decelerating the printing speed, no consideration is given to the magnitude of the load applied to the pulse motor.
Saves labor when performing large accelerations and decelerations.

There were also problems in terms of energy conservation.

It is an object of the present invention to provide a motor speed control method for a printing device that can improve the above-mentioned problems and increase printing speed by performing greater acceleration and deceleration using a motor with the same torque as the conventional one. It is in.

[Means to solve the problem]

In order to achieve the above object, the motor speed control method of the printing device of the present invention includes a print head, a motor as a power source for moving the print head, and a means (control unit) for controlling the speed of the motor. In the printing device, the control unit includes means for setting a constant speed region in which the motor operates at a constant speed between an acceleration region and a deceleration region of the motor speed when the motor shifts from acceleration operation to deceleration operation. The printing method is characterized in that the motor speed is accelerated, passes through a constant speed region, and then decelerated to print.

[For production]

In the present invention, when the motor shifts from acceleration to deceleration,
A constant speed region is provided so that acceleration → constant speed → deceleration is performed, and smooth speed control is performed.

For example, when character types with different printing speeds (kanji, alphanumeric kana, spaces, etc.) coexist, the control unit

First, the distance between these character types is calculated.

Next, in order to change the printing speed, the number of motor steps required for acceleration, constant speed, and deceleration running is calculated.

If the distance between the character types is smaller than the calculated step number, the speed is not changed and the process moves to the next character.

Also, if the distance between the character types is greater than the calculated number of steps, acceleration or deceleration operation is started, and when a predetermined speed is reached, constant speed operation is started, and then deceleration or deceleration is started.
Or change the speed to an accelerated motion.

Thus, from acceleration or deceleration, deceleration.

Alternatively, by always passing through a constant speed region during the transition to acceleration, large fluctuations in the load applied to the pulse motor are prevented.

Therefore, when changing the printing speed, the magnitude of acceleration/deceleration should be
It is possible to increase the size from the beginning, and it is possible to improve the printing speed.

Furthermore, if the printing speed is kept as before, a pulse motor with smaller torque can be used because the load fluctuation is smaller.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a printing device in one embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams of speed control of a pulse motor in one embodiment of the present invention.

FIG. 5 is an explanatory diagram showing the relationship between printing speed and torque in one embodiment of the present invention.

The printing device of this embodiment has a print head 1 as shown in FIG.
．． Pulse motor 2. Control unit 3. and a paper transport mechanism 4, and a pulse motor 2 moves the print head 1.

Further, the control section 3 includes a speed control section, a paper conveyance control section, and a data processing section, and performs speed control of the pulse motor 2, control of the paper conveyance mechanism 4, and data processing.

Regarding the speed control of the pulse motor 2, as shown in Fig. 2, the overall printing speed can be adjusted by changing the printing speed (pulse rate) for each of the character types 9 to be printed, for example, Kanji, alphanumeric kana, and spaces. Measure the improvement of

Also, if there is a space between alphanumeric and kana characters, as in part A, after printing the first alphanumeric and kana character, there is a
will increase its speed, and when it reaches the next alphanumeric/kana character, it will start printing again.During this time, if the amount of space between the alphanumeric/kana characters is small, the original spacing will be faster. before reaching skipping speed.
(to printing) It is necessary to perform deceleration.

Regarding the details of the deceleration in part A, as shown in Fig. 3, when moving from printing the first alphanumeric kana character to high-speed skipping of spaces, in order to accelerate the print head l, it passes through acceleration region 5. The printing speed is skipped by the number of spaces in the constant speed area 6 of the space speed, and then passes through the deceleration area 7 and changes to the printing speed of the next alphanumeric and kana characters.

In this case, L, 1. and 11 to 13 are the nozzles for printing.
In the acceleration area 5, the moving distance of the print head 1 from the printing speed of alphanumeric and kana characters to the time when it accelerates to the space speed is 11, and in the constant speed area 6, the movement distance of the print head 1 to print is 11. The distance traveled at high speed is 12
In the deceleration area 7, the print head 1 decelerates from the space speed until it reaches the alphanumeric and kana character printing speed.
The moving distance of is 13, the minimum number of constant speed running steps is a, the interval between one alphanumeric kana character and the next alphanumeric kana character is L, and 1 is defined as 1=lL+[3. Then, L=11 +12 +13.

Therefore, if the number of spaces is small, 11 cannot be secured and 5
From acceleration region 5 to deceleration region 7 before reaching space speed
When the change occurs, the pulse motor 2
, a force F applied during acceleration and a force F1L equivalent to F are added to form a load.

Also, the relationship between printing speed and torque is as shown in Figure 5.
For the torque 9 of the pulse motor 2, when moving from alphanumeric kana character printing to high-speed space skipping, as in the conventional case,
When the constant speed region 5 is not set, the torque margin 10 is small because the load torque 11 is large. However, when the constant speed region 5 is set, the speed change becomes smooth, and the torque margin 12 when the constant speed region 5 is set increases significantly.

For this reason, the minimum number of constant-speed running steps a required for the printing device is set, and no matter how the speed changes, the printing device always passes through the acceleration area 5, constant-speed area 6, and deceleration area 7. Perform speed control.

FIG. 4 is a flowchart of speed control of a pulse motor in an embodiment of the present invention.

As shown in FIGS. 1 and 3, the speed of the pulse motor 2 is controlled by the control unit 3 based on the minimum necessary constant speed step number a of the printing device of this embodiment, and the speed of the pulse motor 2 is controlled by the control unit 3 to , if the distance from the next alphanumeric kana character is smaller than l + a (400), accelerate to a distance of 1t = (L - a) / 2 (401), and then drive at a constant speed until [2 = a] 402 ), and then decelerates to 13=(L-a)/2 (403).

Also, if L is greater than or equal to l+a (400), 11 =
Accelerate to l/2 (404), then 12=(L-
The vehicle runs at a constant speed until 1) (405), and decelerates to 13=l/2 (406).

Note that in this embodiment, L is the interval between alphanumeric and kana characters, but even if L is the interval between characters with different printing speeds, the speed control can be performed using the same flowchart.

In this way, the load applied to the pulse motor can be reduced when the pulse motor accelerates or decelerates, so if the load is the same, a conventional printing speed can be obtained with a pulse motor of smaller torque. Furthermore, if a pulse motor with the same torque is used, it is possible to accelerate and decelerate more greatly, so it is possible to improve the printing speed.

〔Effect of the invention〕

According to the present invention, in a printing device using a pulse motor, it is possible to reduce the load torque on the pulse motor and improve the printing speed.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a printing device in an embodiment of the present invention;
2 and 3 are explanatory diagrams of speed control of a pulse motor in an embodiment of the present invention, FIG. 4 is a flowchart of speed control of a pulse motor in an embodiment of the present invention, and FIG. 5 is a flowchart of speed control of a pulse motor in an embodiment of the present invention. FIG. 3 is an explanatory diagram showing the relationship between printing speed and torque in one embodiment. 1: Print head, 2: Pulse motor, 3: Control f1 section,
4: Paper transport mechanism, 5: Acceleration area, 6: Constant speed area, 7:
Deceleration area, 9: Torque of pulse motor. 10: Conventional torque margin, 11: Load torque when moving from alphanumeric kana characters to high-speed space skip, 12:
Torque margin in the present invention, a: minimum required number of constant speed running steps, t, , l, i□~13: moving distance I of the print head Fl pa: force applied to the pulse motor. Fig. 1 Fig. 3 +A+ shows 11't, Lri print head travel distance @) Fig. 4 Fig. 5

Claims (1)

[Claims] 1. In a printing device comprising a print head, a motor as a power source for moving the print head, and means for controlling the speed of the motor, the control means may control the speed of the motor when the motor shifts from an acceleration operation to a deceleration operation, Printing characterized by comprising means for setting an area where the motor speed operates at a constant speed between an acceleration area and a deceleration area, and printing is performed by decelerating the motor speed from acceleration through the constant speed area. Equipment motor speed control method.