JPH0692171B2 - Shuttle drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] When the shuttle is moving at high speed to the control means for controlling the driving means of the shuttle of the printer, the shuttle is decelerated from before the reversing section to reverse the shuttle in the reversing section. The printing speed of the printer is improved by providing the reversal position determining means for always keeping the time constant and the reversal control means for reversing the driving means based on the determination of the reversal position determining means.

[Industrial application field]

The present invention relates to a shuttle drive device in a printer,
In particular, drive means for reciprocating the shuttle on which the print head is mounted within the printing section, and controlling this driving device to move the shuttle at a uniform speed in the printing section, and reversely operate the shuttle in the reversing section at both ends. , A control device for driving the shuttle at a speed higher than a normal drive speed depending on the character type to be printed when executing the printing.

There is a wire dot line printer as a type of printer. This is a system in which multiple wire dot print heads are attached to the shuttle at appropriate intervals and the shuttle is moved by the distance between the print heads to print one line of Kanji characters and other characters at once. . Then, after printing this one line, the printing paper is fed by one line, the shuttle is moved from the opposite direction to print the next line, this operation is repeated, and printing is executed one after another. For this reason, the shuttle is provided with a drive device to reciprocate the shuttle. Here, the drive speed of the shuttle is the slowest when printing Chinese characters, and is faster than the printing of Chinese characters when printing other characters in order to increase the printing speed.

[Conventional technology]

Conventionally, as a driving device for the above-described printer, there is the following device. This adopts a DC linear motor as a driving means, drives it by a drive signal from a control device including a driver and a microprocessor for controlling the driver, and makes the following movements.

(1) The state where the shuttle is executing printing in the printing section.
That is, the shuttle is caused to move at a uniform speed in one direction or in the opposite direction. The speed of the shuttle at this time differs depending on the characters to be printed.

(2) A state in which the shuttle finishes printing one line and shifts to printing the next one line. That is, the shuttle decelerates from the constant velocity motion in one direction in the reversal section outside both ends of the printing section, temporarily stops, accelerates in the direction opposite to the one direction, and when it enters the printing section, Speed.

[Problems to be solved by the invention]

By the way, in the above-described conventional shuttle drive device, even when the shuttle is moved at a low speed to print a normal kanji, the shuttle is moved at a high speed to print another character, for example, an alphabet. Since the shuttle is decelerated at the same deceleration rate even when the speed is reduced, it takes time from the start of deceleration to the completion of reversal when the shuttle is moving at high speed, and the printing speed cannot be improved. There is a problem.

[Means for solving problems]

In the present invention, as a means for solving the above-mentioned problems, as shown in FIG. 1, a driving means 2 for reciprocating a shuttle 1 on which a print head is mounted within a printing section, and a driving means 2 for driving the shuttle. When controlling and printing at the normal drive speed, the shuttle moves at the same speed in the printing section to reverse the shuttle in the reversing section located outside both ends of the printing section, and prints when executing printing. In a shuttle drive device including a control means 3 for driving the shuttle at a speed faster than a normal drive speed depending on the character type, a position detection means 4 for detecting the position of the shuttle is provided, while the shuttle is provided in the control means. When the vehicle is driven at high speed, the shuttle begins to decelerate before the reversing section, and the shuttle reversing time in the reversing section is always kept constant. A reversing position determining means 5 for determining the reversing start position of the shuttle in order to so drive the, it is that provided the inversion control means 6 for inversion control the drive means based on the determination of the determination position determining means.

[Action]

According to the present invention, the reversal position determining means of the control device starts decelerating the shuttle from before the reversal section when the speed of the shuttle is high, and sets the reversal start point so that the reversal time of the shuttle in the reversal section is always kept constant. Decide,
On the basis of this determination, the reversal control means controls the driving means for reversal, so that wasteful time is not required for reversal and the printing speed can be improved.

〔Example〕

An embodiment of a shuttle drive device for a line printer according to the present invention will be described below with reference to the drawings. 2 to 6 show an embodiment of the driving device for the line printer according to the present invention. As shown in FIG. 2, the control device of the line printer in this embodiment is provided with a DC linear motor 11 as a drive device for driving the shuttle 10. The linear motor 11 is provided with a driver 12 and two microprocessors 13. , 1
The control device configured in 4 is controlled and driven.

The first microprocessor 13 of the two microprocessors is connected to the host computer, and controls the entire line printer according to a command from the host computer. The second microprocessor 14 connected to the first microprocessor is the first microprocessor.
The driver 12 is controlled by the command of 13 to operate as a reversal position determination means and a reversal control means. Also, shuttle 10
A sensor 15 for detecting the position of the shuttle 10 is provided on the upper part of the position information of the shuttle 10 for the second microprocessor.
The second microprocessor 14 controls the driver 12 based on the information such as the position and speed of the shuttle 10, which is fed back to the driver 14.

In this embodiment, the shuttle travel speed is standard, medium speed,
There are 3 types of high speed, and the standard kanji is DRAFT that can print at high speed without printing adjacent dots in the horizontal direction.
Kanji is medium speed, and alphabets, numbers, and kana (ANK) are high speed to move the shuttle and print.

Then, the second microprocessor 14 controls the driver to change the reversal start position of the shuttle according to the traveling speed of the shuttle.

That is, as shown in FIG. 3, the higher the shuttle speed, the more the reversal start position enters the printing section in which printing is performed, and the faster the deceleration is performed. By doing so, the speed of entry into the reversal section is always constant, and the reversal time in the reversal section is always constant, and the printing speed of the line printer can be increased as a whole.

Specifically, the control device of the shuttle drive device of the line printer executes the control of the shuttle as follows.

As shown in FIG. 5A, the first microprocessor 13 of the control device drives the shuttle by the command of a host device such as a host computer to execute printing. Controls the shuttle to move at a constant speed in the printing section. As shown in FIG. 5 (b), this constant velocity control receives the pulse signal of the position signal detected by the sensor 15 provided at the upper portion of the shuttle 10, and the time between the immediately preceding pulse signal and the current pulse signal is changed. Calculating the interval, comparing the time of this interval with a reference time that is determined by the type of print character, and adjusting the current flowing through the coil of the linear motor based on the result of this comparison to perform acceleration excitation or brake excitation. Is.

When the command to stop or reverse is received, the stop control or the reverse control is executed. In the case of the stop control, as shown in FIG. 5 (c), the current to the linear motor is cut off after a lapse of a predetermined time. Further, in the case of the reversal control, as shown in FIG. 5 (d), the shuttle reversal current is kept flowing to the linear motor until it leaves the reversal section.

Next, the control from the constant speed control of the shuttle to the reversal control will be described in more detail.

In this embodiment, the sensor generates a pulse signal as a position signal while the shuttle is moving in a moving section including a reversing section and a printing section as shown in FIG. 4 (2).
Receiving this position signal, the first microprocessor 13 executes control according to the flowchart shown in FIG. First, the first microprocessor instructs the traveling speed of the shuttle and the reversal point. This is cg = 180, FT = 1.2ms if the character to be printed is Kanji.
Specify as ec. Here, the value of cg designates the point at which reversal is disclosed by the number of pulses of the sensor, and the value of FT designates the pulse and the time of the pulse and the velocity of the shuttle. Therefore, the smaller the value of cg is, the earlier the shuttle inversion start timing is, and the smaller the value of FT is, the faster the shuttle speed is. Therefore, this value is changed depending on the type of characters to be printed.
In this embodiment, when printing DRAFT kanji, cg
= 170, FT = 1msec, and when printing ANK such as alphabet, cg = 160, FT = 0.8msec. These values are set so that the speed at which the shuttle passes the reference point that is the boundary between the print section and the reversal section is constant, and the reversal time in the reversal section after passing this reference point is constant. Is.

Then, the shuttle control is executed based on these set values. First, start the timer, and if the pulse signal from the sensor is detected, stop the timer and measure the time of the pulse signal interval.Compare this value with the FT value and the measured value TIM of the timer is If it is larger than FT, the shuttle speed is slower than the set value and the linear motor is accelerated and excited. Conversely, if the TIM value is smaller than the FT value,
Decelerate and excite the linear motor assuming that the shuttle speed is faster than the set value. Then, the number of pulse signals is counted, and the shuttle is controlled at a constant speed until the number CNT of pulse signals becomes equal to the above-mentioned set value cg (I in FIG. 6). When the number of pulse signals becomes larger than the set value of cg, the shuttle reverses and continues the reversal control until it passes the reference point which is the boundary between the reversing section and the printing section. When the shuttle passes the reference point, it returns to I again. To perform constant speed control. At this time, if the character type to be printed on the next line is different, the first microprocessor 13
Performs an interrupt process and rewrites the values of cg and FT to execute the above-mentioned constant velocity control and inversion control. In this way, the uniform speed control and the reversal control are performed in each line, and the line printer executes printing.

Therefore, according to the present embodiment, the shuttle speed when entering the inversion section is always constant, so the shuttle inversion time in the inversion section is constant, and the inversion time is long even when the shuttle is moved at high speed. As a result, the printing time can be shortened as a whole.

〔The invention's effect〕

As described above, according to the present invention, the shuttle drive device of the line printer is provided with the position detection means for detecting the position of the shuttle, while the control device, when the shuttle is driven at high speed, is provided with the shuttle from the front of the reversing section. Inversion position determining means for determining the shuttle inversion start position so as to drive the shuttle so that the shuttle inversion time in the inversion section is kept constant at all times, and the inversion position determination means. Since the reversing control means for reversing the drive means based on the driving means is provided, the shuttle speed when entering the reversing section is always constant, so the shuttle reversing time in the reversing section is constant,
Even if the shuttle is moved at a high speed, the reversing time is not lengthened and the printing time can be shortened as a whole.

[Brief description of drawings]

1 is a block diagram showing a configuration of the present invention, FIG. 2 is a block diagram showing an embodiment of a shuttle drive device according to the present invention,
FIG. 3 is a diagram showing the operation of the shuttle drive device shown in FIG. 2, FIG. 4 is a diagram showing the reverse timing of the shuttle drive device shuttle shown in FIG. 2, and FIG. 2 is a flowchart showing the operation of the drive device shown in FIG. 2, FIG. 5 (b) is a flowchart showing the operation of constant velocity control, and FIG. 5 (c) is a flowchart showing the operation of the stop control.
FIG. 5 (d) is a flow chart showing the operation in the reversal control, and FIG. 6 is a flow chart showing the operation state of the microprocessor of the shuttle drive device shown in FIG. 1 ... Shuttle 2 ... Driving means 3 ... Control device 4 ... Position detecting means 5 ... Reverse position determining means 6 ... Reverse control means

Front page continuation (72) Inventor Satoshi Yoshino 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa FUJITSU LIMITED (56) References JP 63-132061 (JP, A) JP 61-229583 (JP, A) JP-A-58-63471 (JP, A) JP-A-55-85985 (JP, A)

Claims (1)

[Claims] 1. A drive means for reciprocating a shuttle on which a print head is mounted within a print section, and a control means for controlling the drive means to print at a normal drive speed so that the shuttle moves at a constant speed in the print section. And a control means for driving the shuttle at a speed faster than a normal driving speed depending on the type of characters to be printed when executing the printing while the shuttle is reversed in the reversing section located outside both ends of the printing section. In the shuttle drive device, while the position detecting means for detecting the position of the shuttle is provided, when the shuttle is driven at a high speed, the control means starts decelerating the shuttle before the inversion section and starts the shuttle in the inversion section. Determine the shuttle's inversion start position to drive the shuttle so that the inversion time is always kept constant. Stage and the shuttle driving apparatus characterized by comprising an inverting control means for inverting controlling the drive means based on the determination of the determination position determining means.