JPS6158775A - Printer - Google Patents

Abstract

PURPOSE:To enhance operability, by such a simple mechanism that the switch for detecting the opening and closing of a bale bar is provided and a control circuit outputting a control signal to a paper feed mechanism and a carriage mechanism by the signal from said switch is provided. CONSTITUTION:When an operator opens a bale bar 13, a paper bale switch 21 is turned ON and, when the signal thereof enters CPU23, the paper setting program stored in ROM27 is controlled and a carriage motor 15 and a paper feed motor 12 are driven through a carriage driving circuit 24 and a motor driving circuit 25 to perform automatic paper setting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a printer, and more particularly to a serial printer equipped with an automatic sheet setting line groove.

[Technical Background of the Invention and Problems Therewith] Serial printers are widely used for message communication, data terminals, and computer peripherals.

By the way, in order to add a function to set paper automatically to this serial printer, a paper bail bar drive mechanism and its control circuit are added in addition to the normal paper feeding mechanism and its control circuit. There is a need,
There was a problem that the device became complicated.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a printer having a simple configuration and equipped with an automatic sheet setting device.

[Overview of the invention] The present invention provides a platen around which paper is wound, a paper feeding mechanism that drives the platen and feeds the paper, a print head that prints on the paper, and a print head that prints on the paper. In a printer equipped with a carriage mechanism that reciprocates in a direction, and a paper bail bar equipped with a paper bail roller that presses the paper against the platen,
A bail switch for detecting opening and closing of the paper bail bar is provided, and a sub circuit is provided for receiving a detection signal from the bail switch and outputting a control signal to the paper feeding mechanism and the separate carriage.

In this printer, when the paper bail bar is opened and paper is set on the platen by the operator, the print head is moved to the center in the width direction of the paper so as to serve as a paper guide, and After the waiting time, the paper is fed in the forward direction so that the leading edge of the paper exceeds a predetermined set position. Thereafter, when the paper bail bar is closed, the paper is fed in the opposite direction, and the predetermined process is completed.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of a serial printer.

In this serial printer, numeral 11 is a platen around which paper 31 is wound, and this platen 11 is driven by a paper feed motor 12.

The paper 31 wound around the platen 11 is pressed down by a paper bail roller 10 attached to a paper bail bar 13. Printing is performed on the paper 31 pressed by the paper bail roller 10 by the print head 14. This print head 14 is
Carriage 16 driven by carriage motor 15
It is attached to the paper 31 and moves in the width direction (horizontal direction) of the paper 31.

FIG. 2 shows a schematic configuration of the surroundings of the platen 11 when viewed from the direction of the arrow in FIG.

The paper 31 is placed between the platen 11 and 7 suction rollers 17.1.
When the friction rollers 17 and 18 rotate in accordance with the rotation of the platen 11, they are fed between the platen 11 and the print head 14.

FIG. 3 is a block diagram showing a control circuit for the automatic paper setting structure in the printer. In the figure, reference numeral 21 denotes a bail switch that works in conjunction with the paper bail bar 13 to detect its open/closed state.
3 is opened or closed, a detection signal is sent from the paper bail switch input circuit 22 to the CP LJ 23. The CP IJ 23 receives this detection signal and outputs drive signals for driving the paper feed motor 12 and carriage motor 15, respectively. CPU
The drive signal output from 23 is sent to a carriage motor drive circuit 24 and a paper feed motor drive circuit 25, respectively. The carriage motor drive circuit 24 and the paper feed motor drive circuit 25 convert the input drive signals into levels and timings necessary for driving the motors, and then output the signals to the carriage motor 15 and the paper feed motor 12, respectively.

The ROM 27 stores programs to be executed by the CPU 23, and the RAM 26 is used for temporary storage during program execution. At timer 28, platen 1
After the paper 31 is set on the paper 31 and the carriage 16 is moved to the center of the paper width, the waiting time until the paper feed motor 12 is driven is counted.

In the above printer, when the paper bail bar 13 is opened by the operator, the bail switch 21 is turned on, and the vapor bail switch input circuit 22 outputs CP tJ.
A signal is sent to 23 indicating that the paper bail bar 13 is open. Upon receiving this signal, the CPU 23
Control is transferred to the paper set program stored in M27, and the carriage motor 15 and paper feed motor 12 are driven via the carriage motor drive circuit 24 and paper feed motor drive circuit 25, thereby executing the automatic paper set operation. be done.

Next, the operation of this automatic sheet setting will be explained in detail with reference to FIGS. 4 and 5. Figure 4 shows paper 31 during inhalation.
The horizontal axis represents time, and the vertical axis represents the position of the leading edge of the paper 31. Here, a, b on the vertical axis,
c corresponds to positions a, b, and c shown in FIG. 2, respectively.

When the paper bail bar 13 is opened, the leading edge of the paper 31 is set at position a by the operator. Here, in order to automatically set the paper 31, the carriage 16
It is necessary to move the carriage 1 to the center of the paper 31 in the width direction and use it as a paper guide.
Since the position of G is not constant, the carriage 1G is moved to the center in the width direction of the paper 31 (step S1).

Next, a certain waiting time is set by the timer 28, and the paper bail bar 13 waits until it stops at the open position (position 13' shown in FIG. 2) (steps 82 and 83).Then, the paper feed motor 12 in the positive direction by Ll,
Place the leading edge of the paper 31 at position C beyond the paper bail bar 13.
(Step S4). At this position, wait for the operator to close the paper bail bar 13 (step S5).
), after being closed, the paper feed motor 12 is driven in the opposite direction over L to return the paper 31 to a predetermined position, and the process ends (step Ss, 87).

This completes the automatic setting operation of the paper 31. [Effects of the Invention] As described above, according to the present invention, by simply adding one bail switch and its input circuit to detect the opening/closing of the paper bail bar, Since the ability to automatically set paper can be added, it is possible to provide a printer with a simple configuration and excellent operability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a serial printer according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the area around the platen in the same printer, and FIG. 3 is an automatic paper setting arrangement in the same printer. FIG. 4 is a block diagram showing the control circuit of the printer, FIG. 4 is a diagram showing the movement of the leading edge of paper in the same printer, and FIG. 5 is a flowchart for explaining the operation of the control circuit of FIG. 3. 10... Paper bail roller, 11... Platen,
12... Paper feed motor, 13... Paper bail bar, 14... Print head, 15... Carriage motor, 21... Bale switch, 23... CPU124
. . . Carriage motor drive circuit, 25 . . . Paper feed motor drive circuit, 28 . . . Motor, 31 . . . Paper. Applicant's agent Patent attorney Takehiko Suzue Figure 3 F1 Figure 5

Claims (1)

[Claims] a platen around which paper is wound; a paper feeding mechanism that drives the platen and feeds the paper; a print head that prints on the paper; a carriage mechanism that reciprocates the print head in the width direction of the paper; a paper bail bar equipped with a paper bail roller that presses the paper against the platen; a detection means for detecting opening/closing of the paper bail bar; When the paper is set on the platen, the print head is moved to the widthwise center of the paper, and after a certain waiting time, the paper is fed in the forward direction, and the paper bail bar is closed. and a control means for sending control signals to the paper feeding mechanism and the carriage mechanism, respectively, to feed the paper in a reverse direction and set the paper at a predetermined position.