JPH0336043A - Matrix printing head - Google Patents

Abstract

PURPOSE:To obtain a high reliable printing head of which a characteristic is stabilized by removing magnetic interference between respective drive means by a method wherein the title matrix printing head is so constructed that a displacement generating mechanism is borne on one end of a lever magnifying mechanism, and an armature has a fulcrum becoming a pivot and an acting point of displacement at the other end thereof, and a two stage magnifying mechanism is established. CONSTITUTION:A lever arm 1 composes a lever magnifying mechanism A via a hinge 2. An L-letter formed armature 4 is arranged between the other end part 1a of the lever arm 1 and a support block 3, and an inner angle of the L-letter form is supported by an end part 3a of the support block 3. A projection part 4a becoming an acting point of displacement comes in contact with the end part 1a of the lever arm. When a signal is inputted to a piezoelement being a displacement generating mechanism via a printing substrate, the element is elongated, and a first stage displacement magnification is performed with the lever arm. The displacement acts on the projection part 4a of the armature 4, and the armature 4 is rotatively moved by taking the inner angle of the L-letter form as a fulcrum. A second stage displacement magnification is performed by a lever ratio of this specific fulcrum and the acting point to a fulcrum and a printing wire fixed end.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a matrix print head that performs printing using a dot matrix.

[Conventional technology]

A print head that prints characters, symbols, etc. using multiple print wires. In recent years, the use of kanji has rapidly progressed, and market demands demand high-speed, high-density printed wires. . Further, devices using these print heads are also required to be small and low-priced due to demands for pan computer applications and the like.

Most conventional print heads have a basic configuration of electromagnets as means for driving print wires.

[Problem R that the invention attempts to solve]

When these electromagnets are used, a common problem is that magnetic interference occurs between the individual driving means, and the characteristics differ depending on the number of driving wires, resulting in poor reliability. Furthermore, as the packaging density increases, restrictions must be placed on the printing duty due to the heat generation of the coils, which effectively limits the printing speed. In addition, many pins can be printed at the same time, such as when printing graphs, etc.
Considering the case of t, the volume and weight of one source becomes large, which has the drawback of becoming an obstacle to miniaturization and cost reduction of the device.

[Means for Solving Problem 0] According to the present invention, the lever enlarging mechanism is constituted by an armature that supports a displacement generating mechanism at one end and has a fulcrum serving as a rotation center and a point of application of displacement at the other end. , has a two-stage enlarger box.

〔Example〕

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

The first part shows a new term for this print head, and a lever arm 1 is integrated with a support block 3 via a hinge 2 to form a lever enlargement mechanism A.

The displacement generating mechanism B is held at the shorter distance of the hinge 2 from the end of the lever arm l, and the displacement generating mechanism B is made of a piezo element. An I4-shaped armature 4 is located between the other end 1a of the lever arm l and the support block 3.
＆#) The inner corner of the L shape is the support block 3
The metal protrusion 4a is held at the end 3a of the
is in contact with the end 1a of the lever arm. At the rear of the armature 4, a return spring lO is disposed by a rear cover 9 for the purpose of holding the armature 4 and returning it after printing. Further, an armature guide 11 is provided to guide the lateral position of the armature 4.

A print wire 5 is fixed to the long side end of the armature 4 and guided through a button intermediate guide 8 to a main guide 7 fixed to the tip of the hept frame 6. A printed circuit board 12 that receives signals from an external control section (not shown) is arranged in front of the displacement generating mechanism B.

FIG. 2 is a rear view of the print head, showing that the armatures 4 are arranged radially from the center.

With the above configuration, when printing necessary characters, symbols, etc., a signal is input from the control unit (not shown) to the piezo element, which is the displacement generating mechanism, via the printed circuit board, and the element is activated. is extended, the lever arm performs the first step of displacement expansion, and the protrusion 4atlCK of the armature 4 acts, and the armature 4 rotates using the inner corner of the L-shape as a fulcrum.This special fulcrum and the point of action, The second step of displacement expansion is performed by the lever ratio between the fulcrum and the fixed end of the print wire, and the print wire is driven.

〔Effect of the invention〕

This BA 27"L uses a piezo element and a two-stage displacement magnification mechanism, and since there is no conventional magnetic circuit system, there is no magnetic interference between each drive means, resulting in stable and reliable polarity. High quality print head can be provided.

Another effect is that since there is no heat generated by the coil, the printing speed is not limited by temperature and the printing throughput of the device can be increased.

Another effect is that a print head that requires less drive energy and consumes less power can be provided.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, and a rear cross-sectional view of this embodiment. l... Lever arm, 2. River... Hinge, 3.
River... Support block 34... Armature, 5... Print wire, 6... Headroom, 7... Main guide, 8...・
・Intermediate guide, 9...Rear cover, 10...
...Return spring, 11...A second
The figure shows a mature guide, 2... Printed circuit board.

Claims (1)

[Claims] In a print head having a plurality of print wires, a lever expanding mechanism has a two-stage expanding mechanism consisting of an armature that supports a displacement generating mechanism at one end and a fulcrum serving as a center of rotation and a point of application of displacement at the other end. A matrix print head featuring