JPS6044376A - Printing hammer - Google Patents

Abstract

PURPOSE:To stabilize an operation for high-speed printing and enhance printing quality, by a method wherein a springy force generating means for a leaf spring and a means for varying the spring constant of the leaf spring are provided, and an armature is fixed to a substantially central part of the spring. CONSTITUTION:The armature 2 provided with a printing wire 1 at its tip is fixed to a central part of the leaf spring 3 having both ends fixed to a yoke 4. One end of the spring 3 is fixed to the yoke 4 through a tension-adjusting screw 9, and the springy force generating means for the armature 2 is constituted of a magnet 5, a core 6 and a releasing coil 7. Accordingly, the tension of the spring 3 can be varied, and the spring constant can be set at an appropriate value, so that an inexpensive high-speed printing hammer capable of favorable printing action can be obtained without requiring high accuracy of component parts.

Description

[Detailed description of the invention] The present invention relates to a printing hammer.

Recently, in the age of office automation, the input/output equipment of information processing equipment is rapidly becoming more and more kanji processing and graphic processing, and printing equipment needs to be faster and more dense than ever before. There is. Various types of printing hammers have been developed for use with this type of printing device, among which spring-charge type printing hammers are used.
As an example is shown in FIG. 1, the knob is made up of a magnet 5, a core 6 connected to the magnet, an elastic force generating means including a release coil 7 provided on the core 6, and a leaf spring 3.
It has an armature 2 that is attached to a yoke 4 and has a printing wire 1 at its tip, and when no current is applied to the release coil 7, the armature 2 is moved by the leaf spring 3 due to the magnetic flux of the magnet 5.
is attracted to the core 6 against the restoring force of the magnet 5, but when a current is applied to the release coil 7 to cancel the magnetic flux of the magnet 5, the attraction force between the core 6 and the armature 2 is released. Due to the restoring force of the leaf spring 3, the armature 2 springs in the direction where the deflection becomes zero, as shown by the broken line, and thereby the printing wire 1 hits the printing surface 8 to perform a printing operation.

In such a printing hammer, it is necessary to manufacture the characteristics of the leaf spring with high precision, but because it is difficult to achieve sufficient precision in manufacturing, it is not possible to improve the performance of the printing hammer, or it is difficult to improve the accuracy. The disadvantage was that the price was high. In addition, with a printing hammer designed for high-speed printing, it is difficult to make the wire stroke thicker, and on the other hand, with a printing hammer designed to make the wire stroke larger, it is not possible to speed up printing. This has the drawback that it is necessary to design and manufacture multiple printing hammers each time depending on the application.

The present invention reduces the precision of parts during manufacture by providing a means for changing the spring constant of a leaf spring with an armature mounted in the center and a leaf spring fixed at both ends. To provide a printing hammer with stable operation and good printing quality even during high-speed printing.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a side view of a printing hammer according to an embodiment of the present invention, in which an armature 2 equipped with a printing wire 1 at the tip,
Both ends are fixed to the center of a leaf spring 3 fixed to a yoke 4. Here, one end of the plate spring 3 has a tension adjustment screw 9
It is fixed to the yoke 4 via. Still, the means for generating the explosive force for the armature 2 is mag ;'i'
5, core 6, and release coil 7 constitute I11.

That is, the structure is similar to that of the conventional printing hammer except for the tension adjustment part, and the operating principle is also the same as that of the conventional printing hammer. However, according to the present invention, since the tension of the leaf spring can be changed and the spring constant can be set to an appropriate value, it is possible to achieve high speed, low cost, and good printing operation without requiring a high component sheath layer. Printing hammer can be provided.

Furthermore, according to the present invention, since the spring constant can be changed as described above, by simply changing the adjustment value using the same component, it can be used as a high-speed printing hammer or a printing hammer with a large wire stroke, depending on the application. We can provide printing hammers.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of a conventional printing hammer, and FIG. 2 is a side view of a printing hammer according to an embodiment of the present invention. 1... Printing wire, 2... Armature, 3... Leaf spring, 4... Yoke, 5
...Magnet, 6...Core, 7...
・Release coil, 8... Printed surface, 9... Agent Patent attorney Susumu Uchihara (1,.ゝ. Kimi/FJ, 7/Kaya 2 mouth 6' da

Claims (1)

[Claims] It has an armature having a printing wire at its tip and supported by a leaf spring at the other end, and an elastic force generating means for the leaf spring. A printing hammer having a fixed armature includes means for changing the spring constant of the leaf spring.