JPH0327797Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a guide mounting structure for a dot plate in dot-type printers that express characters, symbols, etc. with multiple dots, such as dot and matrix printers. It is related to.

(Prior Art) Conventionally, there have been printer heads equipped with a plurality of dot plates for forming dots. Each dot plate is driven separately and has a projection for forming dots at the front end of a thin flat plate. This dot plate support device has rings and collars stacked alternately to support the side edges of the dot plate with a loose fit, sandwiching the tip of the dot plate. It has been installed (Utility Model Publication No. 57-3799).

(Problems that the invention aims to solve) However, such guides have a large number of parts, are complicated to assemble, require high precision in left and right alignment, and are complicated to attach to the head frame. There are problems such as:

SUMMARY OF THE INVENTION An object of the present invention is to provide a guide mounting structure for a dot plate that is simple in construction, has a small number of parts, and can be easily and accurately mounted to a head frame.

(Means for Solving the Problems) The present invention is characterized by a plurality of insertion grooves formed in the head frame and a guide inserted into each of the insertion grooves. They are formed in parallel and a locking groove is formed in each insertion groove, and the guide is formed of a thin plate and has a guide hole formed therein, and the guide hole has a projection for forming a dot. A plurality of dot plates are supported in parallel to each other, and elastic arms are formed on both sides of the guide by cutting grooves along the direction of insertion into the insertion groove. The elastic arm is formed with a locking pawl that can be locked in the locking groove.

(Function) Therefore, when the plate-shaped guide is inserted into each of the plurality of insertion grooves with its elastic arms along the insertion grooves, the locking claws of the elastic arms lock into the locking grooves of the insertion grooves. Complete insertion. Furthermore, when a plurality of dot plates are inserted into the guide hole of the guide, the protrusions of the dot plates are aligned in a line at the center, and the dot plates can move forward and backward without coming into contact with each other.

(Example) Embodiments of the present invention will be described based on the drawings.

In the printer head shown in FIG. 4, the head frame 1 is integrally molded from synthetic resin containing carbon graphite, etc., and a guide protrusion 1a is protruded from the center of the front half of the head frame 1. A rectangular guide hole 1b through which the dot plate 4 moves forward and backward is bored in the front end of the dot plate. The paper guide 1c is formed so as to stand upward from the lower front end of the head frame 1 so as to face a platen (not shown). An opening window 1d is provided in the center of the paper guide 1c.
Both sides of this guide are bent backwards in accordance with the flow of printing paper, and the upper end is slightly bent forward. The front end surface of the outer periphery of the opening window 1d is arranged at the same level so that the printing paper sliding on the front end surface of the guide protrusion 1a can come into contact with it. An ink ribbon (not shown) is inserted through the back surface of the paper guide 1c.

The guide protrusion 1a is formed in a hollow shape with an opening at the lower end, and three insertion grooves 21, 22, 23 are provided at predetermined intervals on the inner wall of the hollow portion 2, in which the dot plate 4 is moved. It is formed in a direction perpendicular to this direction. Three plate-shaped guides 3 are inserted in parallel into the insertion grooves 21 to 23.

Each guide 3 is provided with a guide hole 31 as shown in the first and second figures. This guide hole 31 slidably guides a plurality of dot plates 4, for example, nine dot plates 4, in a direction perpendicular to the guide. Each dot plate 4 is made of a thin plate, and as shown in the third figure, a protrusion 4b for forming a dot is formed on the distal end surface of a narrow central plate portion 4a. The guide holes 31 are formed by alternately dividing two rows of long and narrow through holes 31b and 31c, which guide each of the plurality of dot plates 4 in a slidable manner, and these two rows of through holes. 31b and 31c communicate with each other so as to partially overlap each other at a portion near the center, forming a central hole 31a. The width of the through holes 31b and 31c is set to be slightly smaller than the width of the plate portion between adjacent through holes and slightly larger than the thickness of the dot plate 4.

Therefore, as shown by the chain line in FIG. 1, the uppermost dot plate has its protrusion 4 in the central hole 31a.
b, and its plate portion 4a through the left through hole 31.
It is passed through b. The next second dot plate has its protrusion 4b passing through the central hole 31a and passing through the through hole 31c on the right side of the plate portion 4a. The same applies hereafter, and the third, fifth, seventh, and ninth
The plate part of the dot plate is the left through hole 31b.
The plate portions of the fourth, sixth, and eighth dot plates are passed through the right through hole 31c, and all the protrusions 4
b are aligned in a vertical line at the center hole 31a.

In the guide 3, cut grooves 32, 32 are formed from below in the longitudinal direction of this guide, that is, insertion grooves 21, 2.
2 and 23 along the insertion direction. Therefore, the outer sides of the cut grooves 32, 32 are elastic arms 33, 33, and locking claws 33a, 33a are formed on the outer lower end of each elastic arm, and these locking claws are connected to the insertion groove 21. It is possible to engage with a locking groove (not shown) formed near the lower end within 23. Therefore, when the guide 3... is inserted upward from the lower end opening of the insertion grooves 21 to 23, the locking claws 33a, 33a formed on the elastic arms 33, 33 of this guide are inserted into the insertion groove. It automatically engages with the locking groove and is inserted into the predetermined position.

At the rear end of the plate portion 4a of the dot plate 4, a vertically bent portion 4d having an external protrusion 4c is integrally bent as shown in the third figure. The bending angle between the plate portion 4a and the vertically bent portion 4d is set at a predetermined angle from 0 degrees to 90 degrees for each dot plate.

Next, the printing drive mechanism A of the dot plate will be explained.

A return spring 5 is in elastic contact with the front end of the vertically bent portion 4d of the dot plate 4, a drive hammer 6 is in contact with the rear end, and a stopper plate 7 can be in contact with the protrusion 4c. Further, the drive hammer 6 is connected to the support plate 8.
A yoke plate 9 and a permanent magnet 10 are disposed on the rear surface of this support plate via a spacer. The yoke plate 9 has the same number of through holes as the dot plate 4, and the movable yokes 11 are located in each of the through holes. The front end surface of the movable yoke 11 is press-fitted and fixed to the driving hammer 6, and the rear end surface is magnetically coupled to the front end surface of the iron core 13, which is press-fitted and fixed to the yoke 12. A magnetic coil 14 is wound around each iron core 13. Then, by excitation of the coil 14,
By canceling the magnetic field of the permanent magnet 10 and releasing the drive hammer 6 which is biased by the permanent magnet, a predetermined dot plate 4 is projected along the guide hole 31 of the guide 3 to perform printing. be.

When the dot plates 4 move forward and backward during this printing operation, there is a slight gap between the dot plates passing through the guide holes 31 of the three guides 3 and adjacent ones. For this reason, there is no friction when moving forward and backward, and therefore there is no possibility of malfunction due to being dragged by the adjacent dot plate.

(Effects of the invention) As described above, according to the invention, the guide is plate-shaped, the elastic arms thereof are formed with locking claws, and the insertion groove of the head frame is formed with a locking groove, so that the head It is easy to insert into the frame, and the multiple guides prevent the dot plate from vibrating during high-speed printing.It also has a simple configuration, and each dot plate inserted into the guide hole can It can move forward and backward without contact, and there is no need to worry about frictional contact.
Operation reliability can be improved.

[Brief explanation of the drawing]

1 is a front view of the main parts, FIG. 2 is a partially cutaway right side view, FIG. 3 is a plan view of the dot plate, and FIG. 4 is a partially cutaway front view of the printer head. 1...Head frame, 21-23...Insertion groove, 3...Guide, 31...Guide hole, 31a...
... Central hole, 31b, 31c ... Through hole, 32 ... Cut groove, 33 ... Elastic arm, 33a ... Locking claw, 4 ...
...Dot plate, 4b...protrusion.

Claims (1)

[Claims for Utility Model Registration] Consisting of a plurality of insertion grooves formed in the head frame in a direction perpendicular to the moving direction of the dot plate, and a guide inserted into each of the insertion grooves, the insertion groove is The guides are formed parallel to each other, and a locking groove is formed in each insertion groove. The guide is made of a thin plate and has a guide hole formed therein. On both sides of the guide, a locking groove is formed in each insertion groove. An elastic arm is formed by drilling a cut groove along the direction of insertion into the insertion groove, and a locking claw that can be locked in the locking groove is formed in the elastic arm. The guide hole supports a plurality of dot plates having projections for forming dots in parallel to each other, and the guide hole has an elongated through hole that slidably guides each of the dot plates. A mounting structure for a guide for a dot plate of a printer, characterized in that the holes are formed in two rows on the left and right alternately, and the two rows of through holes communicate with each other so as to partially overlap at a portion near the center. .