JPH0447950A - Print head for shuttle printer - Google Patents

Abstract

PURPOSE:To make it possible to print with a satisfactorily high speed regardless of the length of a plate spring by making other end of the plate spring made of magnetic metal face other end of a yoke having a clearance, further, attaching printing pins to the plate springs, and attaching pin guides so as to make work lengths of the plate springs equal. CONSTITUTION:A pin guide 6 is arranged along a line from an end 4A of a plate spring 4 attached to a yoke 1 through other end so as to constrain an oscillation of the plate spring 4. A part extended from the pin guide 6 becomes a work length L of the plate spring 4 which decides the oscillation of the plate spring, and an end of the pin guide 6 is a working fulcrum S. Printing pins 5 are arranged in zigzag so as to provide a high density. so that an end member of the pin guide 6 for deciding the work length L of the plate spring 4 is made in a step-form at underside thereof. When the printing pins 5 perform striking motion against a paper with the elasticity of teh plate spring 4, since the work length L of every plate spring 4 is predetermined by the pin guide 6, all lengths are the same substantially and work response frequency becomes equal. Thus, a speedup of the printing is possible and setting of a printing speed will be easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a print head for shuttle printers, and more particularly to a print head suitable for high-speed printers.

[Conventional technology]

As schematically shown in FIG. 3, the conventionally used high-speed print head has a comb-shaped upper leaf spring 21 in which the lengths of the individual moons 22 are different from each other and are gradually shortened. , is point symmetrical with this upper leaf spring 21, and the upper leaf spring 21
A lower plate spring 32 having a blade 32 located at an intermediate position is arranged facing each other. Printing pins 23.33 are fixed to the tip of each month, and the printing pins 23.33 are generally arranged in a staggered row. Therefore, since the number of printing pins in the vertical direction is increased, the density of printing pins is increased, making it possible to improve printing speed.

[Problem to be solved by the invention]

In the conventional print head as described above, the lengths of the leaf springs are different for each printing pin in the upper leaf spring 21 and the lower leaf spring 31, and this has the advantage that it is possible to increase the density of the printing pins. Because the lengths of the leaf springs that support the printing pins are different, each dot pin has a different response frequency during operation, and the printing speed must be matched to the printing pin with the slowest response frequency. If the length of the spring is long, the response frequency will be low and slow, which is not preferable in terms of speeding up printing.

Therefore, the printing speed is controlled by the length of the leaf spring, and there is a problem in that it is not possible to obtain a print head that can perform satisfactory high-speed printing.

[Purpose of the invention]

An object of the present invention is to improve the problems of the above-mentioned conventional examples and to provide a print head that enables high-speed printing.

[Means to solve the problem]

In order to achieve the above-mentioned objects, the present invention includes a plurality of yokes to which permanent magnets are attached to form a magnetic circuit, a magnetic flux erasing coil wound around each yoke, and a coil with one end attached to the yoke. A magnetic metal plate spring is attached, the other end of the plate spring faces the other end of the yoke with a gap, a printing pin is attached to the other end, and each The present invention is characterized in that a bin guide is fixed to the base of the leaf spring, and the length from the operating fulcrum to the printing pin is determined to be the same for all leaf springs.

[For production]

In the print head of the present invention, the operating and length of each leaf spring provided with the print pin is equally determined by the bin guide, so the response frequency for determining the print speed is unified.

[Embodiments of the invention]

Hereinafter, FIG. 1 of the drawings accompanies an embodiment of the present invention.

This will be explained along with FIG. First, in these figures, reference numeral 1 indicates a plurality of U-shaped yokes made of magnetically conductive metal, and a permanent magnet 2 is attached near one end of each yoke 1, and a permanent magnet is attached near the other end. A degaussing coil 3 is wound thereon to cancel the magnetic flux. One end 4A of a leaf spring 4 formed of magnetic metal is fixed to the end of the yoke 1 on the permanent magnet 2 side.
B is independent in the shape of a comb blade and extends to face the end of the yoke 1 on the degaussing coil side with a gap G, and its end protrudes from the yoke 1. Therefore, each working length is determined to be equal.

Further, a printing pin 5 is attached to each end of the leaf spring 4 protruding from the yoke 1, and one end of the leaf spring 4 attached to the yoke 1 is attached to the opposite side of each leaf spring 4 facing the yoke. A bin guide 6 is arranged along the length from the portion 4A to the other end of the yoke 1, and restrains the vibration of the leaf spring 4. The portion extending from the bin guide 6 becomes the operating length of the leaf spring 4 that determines the vibration of the leaf spring, and the end of the bin guide 6 serves as the operating fulcrum S.

The printing pins 5 are arranged in staggered rows as in the conventional example so as to have a high density. Therefore, the end of the bin guide 6 that determines the operating length of the leaf spring 4 has a stepped bottom surface as shown in FIG.

When the print signal is not input to the above print head,
The leaf spring 4 is attached to the yoke 1. It becomes a part of the closed magnetic circuit formed by the permanent magnet 2 and is attracted against the elasticity of the leaf spring 4 in the direction in which the gap G is closed, and in this state, printing is performed on the printing pin 5. When a signal is input, in other words, when a signal current is supplied to the degaussing coil 3 in a direction that cancels the magnetic flux of the permanent magnet 2, the plate spring 4 is released from being restrained by the magnetic flux, and the elasticity of the plate spring 40 causes printing to occur. The pin 5 performs a striking movement against the paper.

At this time, since the operating length of each leaf spring 4 is determined by the bin guide 6, all the leaf springs 4 have substantially the same length and have the same operating response frequency.

Therefore, when determining the printing speed, since all the leaf springs 4 have the same response frequency, there is no leaf spring with a particularly low response frequency, so it is possible to increase the speed of printing, and it becomes easy to set the printing speed.

4... Leaf spring, 5... Print pin, 6... Bin guide, L... Operating length, S... Operating fulcrum.

〔Effect of the invention〕

As is clear from the above explanation, according to the print head of the present invention, a bin guide is attached to the leaf spring to which the print pin ′ is attached, so that the working length of each leaf spring is made equal. The zigzag arrangement allows high density printing, and the leaf spring to which the printing pin is attached can have the same response frequency regardless of its position, making it suitable for increasing printing speed.

Applicant: Nippon Electric Co., Ltd. Agent: Patent attorney, Isamu Takahashi

[Brief explanation of drawings]

FIG. 1 is a side view of a print head according to the present invention, FIG. 2 is a bottom view of the same, and FIG. 3 is a bottom view of a conventional print head corresponding to FIG. 1...Yoke, 2...Permanent magnet, 3...Degaussing coil, Fig.

Claims (1)

[Claims] (1) A shuttle printer that can print multiple dot lines with a single shuttle has multiple yokes to which permanent magnets are attached to form a magnetic circuit, and a magnetic flux erasing coil wrapped around each yoke. , a magnetic metal leaf spring having one end attached to one end of the yoke, the other end of the leaf spring facing the other end of each of the yokes with a gap therebetween, Furthermore, the other end extends from the yoke, and a printing pin is attached to each leaf spring.
A print head for a shuttle printer, characterized in that a pin guide is attached so that the operating length of each leaf spring is equal.