JPS60180864A - Control system on head moving speed of printer - Google Patents

Abstract

PURPOSE:To exactly stop the operation of a shuttle head even during high-speed printing operations by a method in which the moving speed of the shuttle head when supplying and discharging recording mediums is reduced by a given rate, and then the drive of the head is turned OFF. CONSTITUTION:When final printing process is finished, while reducing the speeds of a shuttle head 2 (during period-D), the head 2 is made to make one-cycle pseudo reciprocal movement. The number of printing timing signals (b) from a print position detector 17 during the reciprocal movement of the head 2 is counted to detect the phase of the eccentric cam. When a given count number (n) is reached (during period-D'), the drive of the space motor 9 is turned OFF. The shuttle head 2 makes an inertic movement and goes into the withdrawing region of the platen 4. After the platen 4 is withdrawn, the shuttle head 2 is stopped after the lapse of a given period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical field of the invention The present invention relates to drive control of a print head such as a shuttle head,
In particular, it relates to the head movement speed fl [I'J I11 method for stopping the shaft head during retraction of the platen.

(2) Prior art and problems Some printing devices have a shuttle head equipped with a printing pin and a platen facing each other, and print while passing a recording medium such as paper between the two members. be. Conventional examples of such printing devices include, for example, those shown in FIGS. 1 and 2.
There is something like the one shown in the figure. This printing device includes a shuttle head 2 that is slidably supported by a guide shaft 3 attached to a device body 1, a platen 4 arranged below the shuttle head 2, and a shuttle head 2 connected to the guide shaft 3. A screw gear 11 that reciprocates in the longitudinal direction, a space motor 9 that supplies driving force to the shuttle head via the screw gear 11, a medium transport table 19 on which the recording medium is placed r1, and a feed roller 20 that feeds the recording medium to the printing section. It consists of:

An eccentric cam 6 is attached to the shaft 5 of the screw gear 11 to move the platen 4 forward and backward relative to the shuttle head 2. Between the screw gear 11 and the platen 4, the platen 4 is suspended and supported by a spring 7, while the platen 4 is moved downward against the action of the spring 7. A plurality of print bins 2a are attached to the side of the platen 4 of the shuttle head 2 in a line, while a table surface 4a is formed on the side of the platen 4 to the shuttle rad 2. On the outer peripheral surface of the screw gear 11, there is a sensor section 15, 16 for determining the printing position and platen position.
On the other hand, a print position detection sensor 17 and a platen position detection sensor 18 are attached to the parts of the main body 1 corresponding to the sensor sections 15 and 16, respectively. Light, magnets, etc. are used for these sensors. The recording medium is conveyed by a paper feed motor 21 and a gear mechanism 22゜23.24 installed between this paper feed motor 21 and a roller shaft.
It is carried out by Note that reference numeral 13 is a speed detector, and reference numeral 14 is a cable that supplies power to the space motor 9.

When the printing machine having such a configuration is operated, the shuttle head 2 reciprocates in the left-right direction according to a constant circumference II as shown in FIG. Return trip B is when the vehicle moves to . On the other hand, the platen 4 moves up and down in response to the reciprocating movement of the shuttle head 2, and as shown in FIG.
During the outward movement F of the shuttle head 2, the platen 4 is at the ascending position 1[1, and during the return movement B of the shuttle head 2, the platen 4 is at the descending position C.
2, take the retreat position. And 1 of platen 4 like this
The correction and descent are detected by the platen position detection sensor 18, and the shuttle head 2 is placed face down. While moving along path F, power is applied to the print bin 2a at a predetermined timing in accordance with the output C1 of the print position detection sensor 17 (FIGS. 3(C) and (d)). When it is desired to suck in or eject a recording medium, the power supply to the space motor 9 for moving the shuttle head 2 is stopped, the shuttle head 2 is stopped within the retreat area C2 of the platen 4, and the paper is fed. It looks like this.

However, such conventional head movement speed υ1t1
In the first method, the wi flow supply to the space motor 9 was cut off when the shuttle head 2 was at a specific position during its reciprocating stroke, so the shuttle head 2 during high-speed printing was inertia force and
Due to changes in friction between parts until it stops naturally,
The stop position of the shuttle head 2 is not determined within a predetermined range, and sometimes the shuttle head 2 stops when the platen 4 is raised.

(3) Purpose of the Invention The present invention was made in view of the above-mentioned conventional problems, and its purpose is to provide a head that can stop the shuttle head while the platen is retracting when sucking or ejecting a recording medium. The object of the present invention is to solve the above-mentioned conventional problems by providing a movement control method.

(4) Structure of the Invention In order to achieve the above object, the present invention comprises a print head, and a platen that is provided opposite to the print head and moves forward and backward relative to the print head in conjunction with the reciprocating movement of the print head. In the printing system Vi having
The moving speed of the print head is reduced by a predetermined percentage, and then the Wi flow to the print drive motor is cut off to move the print head to the platen. ! The gist of this is that it is stopped within the escape recess. - (5) Embodiment of the Invention Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 4 and 5 are block diagrams showing the configurations of a control system and a space drive system, respectively, for implementing the head movement speed I7 control method of the present invention. In Figure 4, III
The all system includes a motor speed control unit 30 that determines the speed of the space motor 9 by receiving a motor start signal, a motor correction signal, and a speed designation signal from the outside, and a motor speed control unit 30 that determines the speed of the space motor 9 based on the determination by this motor speed control unit. It consists of a space motor driver 31 that conducts current, a space motor 9 and a speed detector 13.

The output from the speed detector 13 is fed back to the motor speed control section 30 and used to adjust the speed of the space motor.

In addition, in FIG. 5, the space drive system is at the braten position U.
A detection sensor 18, a print position detection sensor 17, a timing control section 32 that receives output signals from these detection sensors 17 and 18 and a recording medium conveyance preparation signal to determine whether to print or to feed the paper, and a paper feed motor 2
1, a paper feed motor driver 33 that drives the paper feed motor 21 based on an output signal from the timing control unit 32 and a recording medium transport signal, and a print character buffer character shape generator that receives print command signals and extracts printed characters. 34, a print control 35 that controls the printing operation in response to a print timing signal from the print position detection sensor 17, a print bin magnet 37, and a print bin drive signal outputted from the print position detection sensor 17 based on the print bin drive signal. It consists of a printing pin magnet driver 36 that conducts current to a magnet 37.

The timing when normal printing is performed using this configuration is shown in FIG. In this figure, first, the platen position detection sensor 18 (output signal (a))
When detecting the rise of (Tu )l]E), the paper feed motor drive n enable signal (0
) is turned off, and conveyance of the recording medium is prohibited (conveyance status signal (d)). Next, when the shuttle head 2 enters the forward printing area, the printing position detection sensor 17 outputs a printing timing signal (b), and at the same time, a medium conveyance signal (d) is output.
) is turned off and the recording medium is stopped.

Then, the printing bin driving vJ signal (e) is output from the printing IIJtl1 section 35, a current is conducted to the printing bin magnet 37, and printing is performed on the recording medium between P113. When the print timing signal (b) finishes generating, the print bin drive signal (e) also turns off, and the media transport signal (d
> is turned on. And platen position detection sensor 18
After detecting the lowering of platen 4, there is a slight delay between # and T.
When the platen 4 is sufficiently lowered, the paper feed motor drive permission signal (C) from the timing control section 32 becomes A, and the paper feed motor drive signal (") from the paper feed motor driver 33 becomes A. Output.

As a result, the recording medium is fed by a predetermined pitch and the line feed OR of the print line is performed.

Next, FIG. 7 shows the timing when starting the medium conveyance operation from the normal printing state. In this figure, when the final printing stroke of the normal printing operation is completed, the speed of the shuttle head 2 is reduced (DIII]rI!I) and the shuttle head 2 is caused to perform one cycle of pseudo reciprocating motion. During the forward movement of the shuttle head 2, the print position detection sensor 17 outputs a print timing signal @(
The phase of the eccentric cam is detected by counting the number b), and when a predetermined count number n is reached (D=light period, the drive of the space motor 9 is turned off. As a result, the shuttle head 2 performs inertial movement, As the platen 4 enters the exit area, the shuttle head 2 stops after a certain period of time has elapsed since the platen 4 enters the retracted state (S). This stoppage of the shuttle head 2 is detected when the position of the planar 24 does not change for a certain period of time. After confirming that the shuttle head 2 has stopped with the platen 4 in the retracted state, the paper feed motor driver 33 outputs a continuous paper feed motor drive (lt number), and the recording medium is slowly transported. Driving the space motor 9 A) In some cases, a braking action may be applied to the seat head 2 by, for example, operating a power generation brake.

(6) J? As explained above, according to the present invention, when sucking and ejecting a recording medium in a printing device, the moving speed of the shuttle head is reduced by a predetermined ratio +j, and then the drive of the shuttle head is stopped. By turning it off, the shuttle head can now be decelerated smoothly even during high-speed printing operations. Furthermore, the shuttle head can be reliably stopped in the retracted state of the platen, and the continuous conveyance of the recording medium can be carried out even more smoothly.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the structure of printing tt+i of the sittle head type, Fig. 2 is a front view of the printing '#A position shown in Fig. 1, Fig. 3 is a diagram showing the operation timing of the above printing device, The figure is a block diagram showing the configuration of the III control system for implementing the present invention, FIG. 5 is a block diagram showing the configuration of the drive system for implementing the present invention, and FIG. FIG. 7 is a diagram showing the operation timing when the medium conveying operation starts from the normal printing operation in the present invention. 1... Main body 2... Shuttle head 4... Platen 6... Eccentric cam 9... Space motor (drive motor) 11... Screw gear 17... Print position detection sensor 18... Platen Position detection sensor 20...Feed roller 21 Paper feed motor 30...Motor speed control unit 31...Space motor driver 32...Timing control unit 33...Paper feed motor driver 34...Print character buffer Character shape generation section 35...Printing control section 36...Printing pin magnet driver 37...Printing pin magnet

Claims (1)

[Claims] A print head and a printer installed opposite the print head,
In the print section d, which has a platen that moves forward and backward relative to the print head in conjunction with the reciprocating movement of the print head, the drive current to the drive motor of the print head is controlled tIII when the recording medium is sucked in and ejected, and the print head is A head movement speed control system for a printing device, characterized in that the movement speed is reduced by a predetermined percentage, and then the current to the drive motor of the print head is cut off to stop the print head within the retraction range of the platen. .