JPH04308774A - Printer - Google Patents

Abstract

PURPOSE:To obtain a printer always holding a high printing quality independently of a solenoid temperature. CONSTITUTION:By providing a temperature sensor 6 for detecting the temperature of a solenoid 2, a memory means 11 for storing data of an optimum current application time to the solenoid 2 corresponding to a solenoid temperature, and a solenoid drive circuit 10 for controlling the solenoid 2 by an application time in compliance with the temperature data from the temperature sensor 6, a time for applying an electric current to the solenoid is adjusted in accordance with the temperature characteristics of the solenoid (to be short at a low solenoid temp. and long at a high solenoid temp.), whereby a printing can be made with a constant impact force independently of a solenoid temperature.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to printing devices such as electronic typewriters.

0002

2. Description of the Related Art Conventionally, in this type of printing device, printing was performed by striking a type wheel with a solenoid.

[0003] A conventional printing device will be explained below. FIG. 4 is a perspective view of the printing section of a general printing device, and FIG.
is a detailed side view of the printing section. 1 is a plurality of type parts 1
2 is a solenoid that strikes the type part 1a of the type wheel 1 via a hammer 3, 4 is a platen, 5 is a printing paper, and a keyboard ( (omitted in the figure), the inputted character portion 1a is set at the printing position a.

The operation of the above configuration will be explained with reference to the block diagram of FIG. 6 and the flowchart of FIG. 7. In FIG. 6, 7 is a keyboard, 8 is a central control means, and 9 is a solenoid drive means for driving the solenoid 1.

When a character is input from the keyboard 7 (step A), a type selection motor (not shown in the figure) is driven by the central control means 8 to move the type wheel 1.
The printed portion 1a of the corresponding character is set at the printing position (step B), and then a hammer current is applied to the solenoid 2 for a predetermined application time (step C).
) The type part 1a of the type wheel 1 is struck and printing is performed (step D).

[0006]

[Problems to be Solved by the Invention] However, in the conventional configuration described above, the application time of the hammer current to the solenoid 2 is set to the optimum value for each character at the optimum operating temperature (for example, 20°C). The characteristics of the solenoid 2 change due to temperature changes due to the usage environment or heat generated by the solenoid 2 itself, which affects printing power and deteriorates printing quality. In other words, the resistance value of the internal coil of solenoid 2 largely depends on the temperature, and when the solenoid 2 (coil) temperature is low, the coil resistance value becomes low and current flows easily, improving the characteristics of solenoid 2. , the application time of solenoid 2 may be short;
Conversely, if the temperature of the solenoid 2 is high, the characteristics of the solenoid 2 will deteriorate, so the longer the application time of the solenoid 2, the better. here,
The impact force of the solenoid 2 is determined by the product of the hammer current and the application time.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a printing device that can always obtain high printing quality without being affected by the temperature of the solenoid.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides temperature detection means for detecting the temperature of a solenoid, storage means storing data on the optimum current application time of the solenoid corresponding to the solenoid temperature, and solenoid control means for controlling the solenoid with an application time suitable for the temperature data from the temperature detection means.

[0009]

[Operation] With the above configuration, the application time of the hammer current to the solenoid is adjusted to the optimum value by the solenoid control means according to the usage environment of the printing device and the temperature of the solenoid, so that the optimum impact force can be obtained. , the product quality is always kept good.

0010

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. Note that the same reference numerals are used for the same components as in the conventional example, and the explanation thereof will be omitted.

The difference from the conventional example described above is that a temperature sensor 6 is attached to the solenoid 2 as a temperature detection means for detecting the temperature of the solenoid 2, as shown in FIG.
As shown in FIG. 2, the present invention is equipped with a solenoid control means 10 for controlling the current application time of the solenoid 2 and a storage means 11 storing data on the optimum application time of the solenoid 2.

Next, the operation will be explained with reference to FIGS. 2 and 3. Characters are input from the keyboard 7 (step a)
Then, the central processing means 8 drives the type selection motor (not shown) to set the type part 1a of the corresponding character on the type wheel 1 at the printing position (step b).
). The operation up to this point is the same as the conventional example. Next, the temperature of the solenoid 2 is detected by the temperature sensor 6 (step c), and the solenoid temperature is transmitted to the solenoid control means 10 via the central control means 8. Then, the solenoid control means 10 selects the optimum current application time data for the detected temperature, that is, the current application time data is short when the solenoid temperature is low, and long when the solenoid temperature is high, from the optimal current application time data stored in the storage means 11. (step d), a hammer current is applied to the solenoid 1 by the solenoid drive circuit 9 for the optimum application time (step e),
The type wheel 3 is struck and printing is performed (step f). As a result, high print quality can always be obtained without being affected by temperature.

[0013]

As described above, according to the present invention, when printing, it is possible to detect the solenoid temperature of the printing device and optimize the hammer current application time depending on the temperature. High print quality can always be obtained regardless of the environment or solenoid temperature.

[Brief explanation of drawings]

FIG. 1 is a detailed side view of a printing section of a printing device according to an embodiment of the present invention.

FIG. 2 is a device block diagram of a printing device according to an embodiment of the present invention.

FIG. 3 is a flowchart of a printing device according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a printing section of a conventional printing device.

FIG. 5 is a detailed side view of a printing section of a conventional printing device.

FIG. 6 is a device block diagram of a conventional printing device.

FIG. 7 is a flowchart of a conventional printing device.

[Explanation of symbols]

1 Type wheel 1a Type part 2 Solenoid 3 Hammer 6 Temperature sensor (temperature detection means) 10 Solenoid control means 11 Memory means

Claims (1)

[Claims] 1. A printing device comprising a solenoid and a type wheel, which performs printing by striking the type wheel with an impact force by the solenoid, comprising: temperature detection means for detecting the temperature of the solenoid; A printing device comprising a storage means storing data on an optimum current application time for a solenoid, and a solenoid control means for controlling the solenoid with a current application time suitable for the temperature data.