JPH0316914B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device, and particularly to a printing device capable of printing at different printing pitches while sequentially moving a carriage.

[Prior art] In printing devices capable of printing with variable printing pitches, in order to make it clear to the operator at the time of printing which position on the paper is being printed, or how many characters can be printed remaining, a variable printing pitch is set at each printing pitch. It is convenient to have a corresponding scale available. However, since the scales corresponding to each printing pitch are simply arranged vertically, the operator needs to check the printing pitch by looking at the carriage of the printing section each time to find out which pitch is being printed. I was checking. Therefore, this requires the operator's concentration, leading to frequent typos. Also, there is no way to back up the print pitch once set.
When the printer is restarted after a power outage or failure, the printing pitch must be reset, which poses a problem in that operability and efficiency deteriorate.

[Object of the Invention] Therefore, the present invention solves such conventional drawbacks, and improves operability and printing by displaying a selected printing pitch and eliminating the need to reset the printing pitch. The purpose is to provide a printing device with improved efficiency.

[Embodiments] Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The electronic typewriter 1 according to an embodiment of the printing device of the present invention shown in FIG. 1 is equipped with a character display 94, and has at least three types of horizontal printing pitches: 10 characters, 12 characters, and 15 characters per inch. ing. The case 8 has three scales 8a, 8b, and 8c carved in correspondence with 10 character pitches, 12 character pitches, and 15 character pitches per inch, and the carriage indicator 12 has 3 scale marks as shown in FIG. LEDs
LEDs 12a, 12b, and 12c are mounted on the carriage 26 and correspond to the print pitch specified from the keyboard 10.
b, 12c are selectively lit, and the corresponding scale 8
a, 8b, 8c and the carriage position to the first
It is shown on scale 8 as shown in the figure.

The keyboard 10 includes a character key group 10a for inputting and printing characters, and a control key group 10 arranged on both sides of the character key group 10a.
The input key signals are read in the keyboard control unit 24 of FIG. 2 and sent to the main control unit 22 including the MPU. Also, related data is sent from the unit 22 to the printer control unit 16 and printed. Also, related data is sent from the unit 22 to the control unit 9L of the character display 94.
The characters are displayed. LEDs on the keyboard 10, such as line advance pitch switches or illuminated keys.
In the case of a key input to change the lighting of the keyboard, data for controlling the lighting of the LED is sent from the main control unit 22 to the keyboard control unit 24. Reference numeral 14 denotes a paper feeding pulse motor which rotates the platen 17 via a transmission belt 15 under the control of a unit 16 to move the paper.

18 is a servo motor for moving the carriage, gear 2
0. The carriage 26 is moved left and right along the guide rods 25 and 27 through the belt 21. A printing hammer 32 is mounted on the carriage 26, and the printing type on the selected petal-type type wheel 30 is struck by the printing hammer 32 and printed on the paper attached to the platen 17 via the ribbon 34 in the ribbon cassette 36 (Fig. (not shown). As mentioned above, there are LEDs 12a to 12 at the rear of the upper part of the carriage 26.
A carriage indicator 12 consisting of c is provided to indicate the position of the carriage as it moves in accordance with the print.

A photo encoder 19 detects the rotation angle of the motor 18, and is fed back to the printer control unit 16 to form a servo control loop. 23 is a backup battery for the storage section in the main control unit 22, which prevents stored information from being lost when the power is turned off. The speaker 42 is for generating an alarm sound. A power supply unit 13 located below the rear of the printer section supplies power to each section during operation.

A circuit diagram for controlling the indicator indicating means 12 is shown in FIG. For example, the pitch switching key 10 arranged on the keyboard 10 in FIG.
When d is operated, data is input to the MPU 44 via the keyboard control unit 24, and based on the data, a light emitting diode (LED) is input to the latch circuit 46.
A signal for operating any one of 12a to 12c is stored under the control of address decoder 45. For example, in the case of an input signal of 10 characters per inch, when key 10d is operated once, inverter 47
The LED 12a is turned on through the inverter 47b, indicating the scale 8a, and when the key 10d is operated one more time in the case of 12 pitches, the LED 12a is turned on through the inverter 47b.
2b is lit to indicate the scale 8b, and when the key 10d is operated once more in the case of 15 pitches, the LED 12c is lit via the inverter 47c and the scale 8c is indicated. Further, the printer control unit 16 controls the drive of the carriage drive motor 18 in accordance with each printing pitch, and controls the carriage 26.
is moved in accordance with the printing pitch. In that case, the LED that is selected and lit is attached to the carriage, so the position of the carriage can be clearly indicated. In addition, the light emitting diodes La,
It is even more convenient because Lb and Lc are selectively illuminated and whether the current print pitch is 10 characters, 12 characters, or 15 characters per inch is displayed on the keyboard 10.

[Effects of the Invention] As described above, according to the present invention, the printing pitch selected by the pitch selection section is displayed on the display section provided near the pitch selection section, so that key input using the keyboard is not required. You can easily check the print pitch inside the machine, allowing you to input data in a focused and accurate manner, and you can also back up the memorized print pitch.
There is no need to reset the printing pitch even after restarting after a power outage or failure, making it possible to print efficiently with extremely good operability.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the external appearance of an electronic typewriter as an example of the present invention, Fig. 2 is a perspective view showing the internal mechanism of Fig. 1, and Fig. 3 is a block diagram showing the carriage position indicating means. be. 8, 8a, 8b, 8c... memory board, 10...
Keyboard, 10d... Pitch switching key, 12
...Indicator, 12a-12c...LED,
18...carriage drive motor, 26...carriage, 30...type wheel, 32...printing hammer.

Claims (1)

[Scope of Claims] 1. A printing device having an input section having a keyboard including character keys, and a printing section connected to the input section, wherein the input section is arranged to select one of a plurality of different printing pitches. a pitch selection section for selecting one of the pitch selection sections; a storage section for storing printing pitch data selected by the pitch selection section; and a display for displaying the selected printing pitch in the vicinity of the pitch selection section. and a printing control section that sequentially moves a carriage provided in the printing section according to the selected printing pitch, and further includes a printing control section that sequentially moves a carriage provided in the printing section according to the selected printing pitch, and further includes a printing control section that is selected by the pitch selection section and stored in the storage section. A printing device comprising a power supply means for supplying backup power to protect stored print pitch data.