JPH05254157A - Dot impact printer - Google Patents

Abstract

PURPOSE:To achieve data printing using an appropriate printing force if a print pattern differs in a dot impact printer. CONSTITUTION:The control of a coil current for allowing the wire of a printing head 6 to protrude is selected using a manual/auto switch 50, and then is switched using a print control circuit 14 through a control switching circuit 11. The printing force is set using an up/down switch 51, then the setting data is received by a receiving analysis/conversion part 13 and the processed data is sent to the print control circuit. In addition, a coil current to the printing head 6 is controlled using a print head control part 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dot impact printer.

[0002]

2. Description of the Related Art In a conventional dot impact printer, the amount of current supplied to a coil for ejecting a wire of a print head is basically constant, and the amount of current is automatically adjusted depending on the paper thickness and the type of ribbon. Although there were cases where it was changed, there was no means for manually forcibly changing the amount of current according to the pattern to be printed.

[0003]

In this conventional dot impact printer, the difference in the pattern to be printed is not reflected in the printing power. Therefore, if the printing power is set to a high level, the paper will not be printed when a dense pattern is printed. There is a problem that it may be damaged, and conversely, if the printing power is set to be weak, there is a problem that the printing becomes unclear when printing on pressure-sensitive paper.

[0004]

SUMMARY OF THE INVENTION A dot impact printer of the present invention is a dot impact printer in which a current is passed through a coil to cause a wire to protrude from a print head and printing is performed on a printing paper with a printing pressure according to the current amount of the coil. , A first switch for selectively designating whether the current amount of the coil is a preset value or a value designated from the outside, and a second switch for instructing increase or decrease of the current amount of the coil. The designated state of the switch and the first switch is judged, and when the preset value side is designated internally, this value is taken as the current amount of the coil, and the value side designated from the outside is designated. In this case, the value of the coil is increased or decreased from the preset value according to the instruction of the second switch. And control means, and a print head control means for supplying a current to the coil in accordance with the current amount determined by the print control means.

[0005]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. The print head 6 has a built-in wire (not shown) for printing and a coil for projecting the wire, and a current is supplied from the print head control unit 14 controlled by the print control circuit 13 to this coil. Is supplied. On the operation panel 5, it is selected whether the user selectively changes the setting of the current amount according to the print pattern or the printer is kept under the internal control, and the control switch circuit 11 is used to send the print control circuit 13 to the print control circuit 13. The manual / auto switch 50 for transmission and the user stepwise instructing the increase / decrease of the current amount by a predetermined value unit according to the paper thickness etc., and the reception analysis / conversion unit 1
Up · Do transmitted to the print control circuit 13 via 2
It has a wn switch 51. The details of the normal printing operation and mechanism are well known, and the description thereof is omitted.

FIG. 2 is a perspective view showing the external structure of the embodiment shown in FIG. There is an operation panel 5 on the front of the printer outer box 1, a manual / auto switch 50 and an UP / Dow
An n switch 51 is provided. The printing paper 3 is inserted from the paper insertion port 4 at the rear of the printer, sent to the front of the print head 6 by the platen 7 and the paper feed roller 8, and discharged from the gap between the cover 2 made of a transparent plate and the outer case 1. It In this embodiment, pressure sensitive paper is used as the printing paper 3, but normal paper can also be used if an ink ribbon is used.

Next, the operation will be described.

When the density of the print pattern is low, or there is a thickness of paper such as postcards and bond paper, the print pressure may be set to a high level under the internal control and the print paper may be damaged as a result. Selects the manual side with the manual / auto switch 50 of the operation panel 5, and causes the control switching circuit 11 to issue an instruction to control the printing power by setting the Up / Down switch 51 of the operation panel 5 instead of the internal control. Print control circuit 1 via
Transfer to 3. In the print control circuit 13, the one that originally controlled the printing pressure by the internal control is
The setting for switching to the control on the side of the wn switch 51 is performed, and the Up / Down switch 5 is set via the reception analysis / conversion unit 12.
The command for weakening the printing force from 1 is received and analyzed, and information is transmitted to the print head control unit 14 so as to reduce the amount of current flowing through the coil in order to project the wire of the print head 6. The print head 6 causes the wire to project with a force corresponding to the current amount of the coil, and prints on the print paper 3 wound around the platen 7.

On the contrary, if the print pattern has a high density and the print pressure is lowered if the internal control is left as a result, and the printed characters may become unclear, the internal pressure is set by the manual / auto switch 50 as described above. After switching from control to control by the Up / Down switch 51 of the operation panel 5, Up. A command for increasing the printing power is sent from the Down switch 51, this command is analyzed by the reception analysis / conversion unit 12, and the print control circuit 13 prints so as to increase the amount of current flowing to the coil in order to project the wire of the print head 6. Information is transmitted to the head control unit 14.

[0011]

As described above, according to the present invention, the printing power of the printer can be manually adjusted from the outside. Therefore, it becomes easy to print with an appropriate printing power according to the pattern to be printed and the type of paper. It has the effect of improving the printing quality.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a perspective view showing the appearance and structure of the embodiment of FIG.

[Explanation of symbols]

 1 Printer Outer Box 2 Transparent Cover 3 Printing Paper 4 Printing Insertion Port 5 Operation Panel 6 Print Head 7 Platen 8 Paper Feed Roller 11 Control Switching Circuit 12 Reception Analysis / Conversion Section 13 Print Control Circuit 14 Print Head Control Section 50 Manual Auto Switch 51 Up. Down switch

Claims (1)

[Claims] 1. A dot impact printer that applies current to a coil to project a wire from a print head and prints on a printing paper at a printing pressure according to the current amount of the coil, wherein the current amount of the coil is preset inside. Selected value or a value specified from the outside, a first switch for selecting and specifying, a second switch for instructing increase or decrease of the current amount of the coil, and a specified state of the first switch. If it is determined that the preset value side is designated internally, this value is used as the current amount of the coil, and if the value side designated from the outside is designated, the instruction of the second switch is given. The print control means for increasing or decreasing the preset value according to the current value of the coil, and the electric current determined by the print control means. A dot impact printer, comprising: a print head controller that supplies a current to the coil according to a flow rate.