JPS5938084A - Printer - Google Patents

Abstract

PURPOSE:To miniaturize the equipment with a smaller power source section by switchig bidirectional printing over to unidirectional printing detecting the rise in the temperature of the power source in a multi-pin dot printer. CONSTITUTION:A temperature sensor S is provided near a transistor Q (for driving a print head section 8) of a power source section 1. As printing load increases, the temperature of the transistor Q rises and when it exceeds a given level, a detection signal A is fed to a latch circuit 4. A judge section 5 judges this and transmits a stop signal SP to halt a signal generator section 9 while transmitting a start signal ST to actuate a signal generator section 10. In other words, bidirectional printing by the signal generator section 9 is switched over to unidirectional printing by the signal generator section 10. No printing is done in the process in which the print head section 8 returns to the left end from the right end by a carriage return command CR thereby reducing the power source load.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a printing device having printing control means in both forward and reverse directions.

佽) Conventional technology and problems ・Multi-pin dot printers are widely used because of their good printing quality for 9 kanji figures, etc. With this printer, when kanji characters or complex figures are printed continuously, the temperature rises in various parts of the printer due to the continuous load, but the areas where this is most noticeable are the print bed and the power supply. It is. In the conventional method, a sensor is installed in the print head,
This problem was solved by slowing down the printing speed when high temperature was detected, and by using a power supply with a high company's allowable temperature1.For this reason, the latter power supply Since the heat capacity is large and it is necessary to install a large cooling fan, the entire device becomes bulky and expensive. In such printers, it would be possible to install a temperature sensor in the power supply section and reduce the printing load (for example, by switching from bidirectional printing control mode to unidirectional printing control mode) when the sensor senses a temperature rise. The heat capacity of the source can be kept low and its size can be reduced.

(e) Purpose of the Invention The present invention has focused on the above points, and an object of the present invention is to provide a printing device that facilitates miniaturization of the device.

(d) Structure of the Invention The present invention provides a printer having a print head section and a power supply section that supplies electric power to drive the print head section, in which the print head section is moved in a first direction to perform printing. a second control means for printing by moving the print head section in a second direction opposite to the first direction; a sensor for detecting a temperature rise of the power supply section; and a switching control means, the first control means and the second control means are alternately used for each line feed to switch the switch from the power supply unit during printing. The printing apparatus is characterized in that when the detection signal is issued, either the first control means or the second control means is turned down, or one of the control means causes printing to continue.

(e) Examples of the invention The present invention will be explained below with reference to the drawings. The drawing is a block diagram illustrating an embodiment of the present invention, in which 1 is a power supply section, 2 is a block diagram illustrating an embodiment of the present invention;
is a processing device, 3 is a processing section, 4 is a latch circuit, 5 is a discrimination section, 6 is a line buffer, 7 is a print driver, 8 is a print head, 9.10 is a signal generation section, 11 is a space driver, 12 is a mechanism Department.

A is a detection signal, B is a reverse print command, C is a capacitor,
CR is a calibration command, D is print data, E is an end signal, F is a forward print command, Q is a transistor, R is a resistance, S is a temperature sensor, SP is a stop signal, ST is a start signal, and ■ is a voltage. .

The embodiment is an example of a dot printer equipped with two print control means for both forward and reverse directions. That is, in response to the forward direction command F issued from the signal generating section 9 in the drawing, the print head section (carriage) 8 performs printing while moving from the left end of the printing section (not shown) to the right. printing control means). When the print head section 8 reaches the right end of the print section, the mechanical section 12 issues an end signal E, and upon receiving this, the signal generating section 9 issues a reverse direction printing command B, so that the print head section 8 is moved from the right end to the left before printing is performed (second print control means) It is taken out with a bit tip and supplied via the print driver 7.

In such a printer, a temperature sensor S is installed near the transistor Q (for driving the print head and section 8) of the power supply section I.
will be established. When kanji characters, figures, etc. are printed continuously, the temperature of the transistor Q increases. When this temperature exceeds a predetermined temperature, the temperature sensor S is activated (the contact is turned on) and a detection signal A is sent to the latch circuit 4. The determining unit 5 determines this, issues a stop signal SP to stop the signal generating unit 9, and issues a start signal ST to stop the signal generating unit lO.
Activate. Therefore, the signal generator 1oii returns the carrier finger cRta every time the print head unit 8 receives the signal vF'' times E' emitted from the mechanical unit 12 when the print head unit 8 reaches the right end of the print unit. The print head section 8 prints in one direction from the left end to the right end, similar to a general typewriter.As is well known, the process of returning from the right end to the left end of the print head section 8 is to print according to the carry command CR. Since there is no printing, the load on the power supply is reduced, and a smaller heat capacity is required.

(f) Effects of the Invention As described above, the present invention has the advantage that the power supply section of the printer can be miniaturized.

[Brief explanation of the drawing]

The drawing is a block diagram illustrating an embodiment of the present invention,
The symbols used in the figure are as follows: 01 power supply section, 2 processing device, 3 processing section, 4 latch circuit, 5 #1 discrimination section, 6 line buffer. Print driver from 7 companies, print head from 8 companies, 9.10 is a signal generator, 1lti space driver, 12 is a mechanical part, A is a detection signal, B is a reverse print command, C is a capacitor, CR
is the carriage return command, D is the print data, Company E's end signal, and F is the forward print command. Q is a transistor, R is a resistor, and S is a temperature sensor. SP indicates a stop signal, ST indicates a start signal, and ■ indicates a voltage.

Claims (1)

[Claims] In a printer having a print head section and a power supply section that supplies electric power to drive the nuclear print head section, a first control means for moving the print head section in a first direction to print; a second control means for printing by moving the print head section in a second direction opposite to the second direction; a sensor for detecting a temperature riser tube of the power supply section; and means for determining a detection signal from the sensor; a switching control means, and when the detection signal is emitted from the power supply section during printing by alternately using both the first control means and the second control means for each line feed, A printing device characterized in that printing is continued by one of the first control means and the second control means.