JPH03240560A - Printing head - Google Patents

Abstract

PURPOSE:To improve the assembling workability by forming a groove which extends in such a manner that it connects through holes sequentially for guiding printing wires provided on a tip guide plate in an aligned state and is open at the edge part of the tip guide plate, on the rear of the tip guide plate installed at the tip of a nose part. CONSTITUTION:A tip guide plate 20 is provided at the tip of a nose part 15, and nine through holes 23 arranged in a vertically single line are formed on the tip guide plate 20. In addition, a groove part 24 which extends vertically in a straight line in such a manner that it connects nine through holes 23 sequentially is formed on the rear(the inner surface side of the nose part 15) of the tip guide plate 20. Further, the start end of the groove part 24 is open at the edge of the open surface 15a of the tip guide plate 20. Then the tips of printing wires 12 are held in a vertically single line using, for example, a pair of tweezers, and are introduced sequentially through the open end of the groove part 24.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of the Invention The present invention relates to a print head for a dot impact type printer.

(Prior Art) The print head of a dot-impact printer is configured to selectively protrude, for example, nine printing wires lined up vertically, and these printing wires are struck onto printing paper via an ink ribbon. This allows printing to be performed.

As shown in FIGS. 10 and 11, such a print head includes a print head main body 3 having, for example, nine print wires 1 and an actuator 2 for selectively protruding these print wires 1, and this main body 3. The nose portion 4 is provided on the front surface (upper surface in the figure) of the nose portion 4. The printing wire 1 passes through two intermediate guide plates 5, 5, and is housed in the nose portion 4 with the intermediate portion guided by the two intermediate guide plates 5, 5, and its tip portion is provided at the tip of the nose portion 4. It penetrates through the tip guide plate 6 and protrudes from the front surface thereof by a predetermined length. At this time, as shown in FIGS. 8 and 9, nine through holes 7 arranged in a vertical line are formed in this tip guide plate 6, and each printing wire 1 is inserted into each through hole 7. The printing wires 1 are aligned in a vertical line.

(Problem to be Solved by the Invention) By the way, in assembling the above-described print head, as shown in FIG. The tip of the printing wire 1 must be passed through each through hole 7 of the tip guide plate 6.

This operation of pushing each printing wire 1 into each through-hole 7 involves inserting the tips of all the printing wires 1 into each through-hole 7, as shown in FIG. They were aligned in a corresponding position, held in place with tweezers, and then inserted into each through hole 7 all at once in this state.

However, in this case, after the tips of all the printing wires 1 are placed in both the vertical direction (in the direction of the arrow X in FIG. 9) and the horizontal direction (in the direction of the arrow Y in the same figure), Therefore, there was a problem in that the positioning work was very troublesome and time consuming.

The present invention has been made in view of the above two circumstances, and an object of the present invention is to provide a print head that can easily insert a print wire into a through hole for guiding the print wire and improve assembly work efficiency. It is on offer.

[Structure of the Invention] (Means for Solving the Problems) The print head of the present invention has printing wires provided on the tip guide plate arranged on the back side of the tip guide plate provided at the tip of the nose portion in an aligned state. It is characterized by the formation of a groove that extends so as to sequentially connect a plurality of guided through holes and opens at the edge of the tip guide plate.

(Function) According to the above means, when pushing each printing wire into each through hole, the tip of each printing wire is sequentially inserted into the groove from the open end of the groove along the direction in which it extends, and all the printing wires are After inserting the tips of the wires into the grooves, align each printing wire with each through hole, and then insert the wires all at once.

In this case, the positioning of the plurality of printing wires only needs to be performed in one direction that matches the spacing between the through holes, so the work can be easily performed.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIGS. 3 to 5, the printing head 11 according to this embodiment includes, for example, nine printing wires 2 and an actuator 1 for selectively protruding these printing wires 2.
3 and a nose portion] 5 provided on the front surface of the main body 14.

The main body 14 is connected to the actuator 13 . Spacer 1
6. Leaf spring 17. It has a thin cylindrical shape as a whole including a front yoke 18 and the like, and the printing wires 12 are provided to extend forward from the center of the front surface. On the other hand, the nose portion 15 is on the negative side [fi (installation on the printer (=1
It has a rectangular tube shape with an open surface 15a (which is the lower surface in the state), and a tip guide plate 20 as described later is provided at the tip (upper end in the figure), and a solid flange is provided at the base end. 21
It has an integrated structure. This collar portion 21 is provided with a rectangular opening 2]a that communicates with the inside of the nose portion 15, but in this case, this opening 21a is a long hole extending toward the open surface 15a. Ru. Further, on the inner surface of the intermediate portion of the nose portion 15, there is a slide that opens at the open surface 15a.
a715b, 15b are formed.

This nose portion 15 is attached to the main body 4 so that the collar portion 21 is overlapped with the front surface of the main body 14, and at this time, the printing wire 21!1 is attached to the opening 21a.
The distal end thereof passes through the distal end guide plate 20 and protrudes from the front surface thereof by a predetermined length dimension. Also, at this time,
The middle part of the second group of printing wires is the slide groove 15b,
15b1. : Guided by two intermediate guide plates 22 and 22 supported in an inserted state, each printing wire 2 is lined up in a line in the vertical direction (direction of arrow X in Figures 1 and 2). It is said that

Now, as shown in FIG. 1, the tip guide plate 20 has nine through holes 23 arranged in a vertical line. The tips of the printing wires 2 are inserted into each of the through holes 23, so that the tips of the printing wires 12 project to the front in a vertically aligned state. As shown in FIGS. 1 and 2, on the back surface of the tip guide plate 20 (inner surface side of the nose portion 15), a straight line is formed in the vertical direction so as to sequentially connect the nine through holes 23. An extending groove portion 24 is also formed. The starting end of the groove 24 is formed to open at the edge of the open surface 15a side of the tip guide plate 20, and the ending position is located at the end of the through hole 23. Match.

Here, the procedure for assembling the print head 1 configured as shown below will be described.

First, the main body] 4 and the nose portion 15 are configured as described above. Further, at this time, as shown in FIG. 3, intermediate guide plates 22 and 22 are fitted into the intermediate portion of the printing wire 12.

Next, the printing wires 12 of the main body ] 4 are inserted into the opening 21 of the flange 21 . Insert from a. At this time, the group of printing wires 12 is positioned outside the open surface 15a of the nose portion 15. Next, as shown in FIG. 2, when the tip of the printing wire 12 is inserted until it matches the groove portion 24 of the tip guide plate 20, as shown in FIG. 15 into the slide groove 15b. Then, using, for example, a bottle set, the tips of the printing wires 12 are held in a vertically aligned state as shown in FIG. At the same time, the entire intermediate guide plate 22.22 is inserted into the slide groove 15b.

After the tips of all the printing wires 2 are inserted into the groove 24, each printing wire 12 is positioned so as to correspond to each through hole 23. Then, each printing wire 12 is inserted into each through hole 23 at once while maintaining the alignment state. Thereafter, the main body 14 and the nose portion 15 are fixed, and the protrusion dimension of each printing wire 12 from the tip guide plate 2o is adjusted.

According to this embodiment, since the groove 24 is formed on the back surface of the tip guide plate 20, when pushing each printing wire 2 into each through hole 23, the tip of the printing wire 2 is inserted along the groove 24. By sequentially inserting the printing wires 2 into the through holes 23, each printing wire 2 can be aligned in the lateral direction (in the direction of the arrow Y) with respect to the group of through holes 23. Therefore, unlike the conventional method in which the tips of all the printing wires 1 had to be positioned in both the vertical and horizontal directions before being inserted, it is now possible to position them only in the vertical direction according to the spacing of the through holes 23.
This makes the work extremely easy. As a result, the printing wire 2 can be easily inserted into the through hole 23 in a short time, and the assembly workability can be extremely improved.

6 and 7 show another embodiment of the present invention, and the difference from the above embodiment is that the groove 3 formed in the distal guide plate 31
2, the starting end portion is formed in an expanded shape toward the open side. According to this configuration, the groove 3 at the tip of the printing wire 2
This makes it easier to insert the material into the 2nd part, and the workability can be further improved.

In the above embodiment, the opening 21a of the flange 2]- is formed into a long hole extending toward the open surface 15a, and the intermediate guide plate 22 is inserted into the slide groove 15b from the open surface 15a side. The - side is the slide groove 1, 5 b
After inserting into the nose part] 5 with the other side smaller than the width inside the nose part 15 and having a rectangular shape with rounded corners and shifted by 90 degrees, at the slide groove 15b part 9
It may be rotated 0 degrees and fitted into the slide groove] 5b; in this case, the opening of the flange 21 does not have to be a long hole, but is large enough to be inserted through the intermediate guide plate rotated 90". In addition, in the above embodiment,
Although the present invention has been applied to a so-called 9-bin head in which nine printing wires 12 are arranged in one vertical row, it can also be applied to a so-called 18-pin printing head in which nine printing wires 12 are arranged in two vertical rows. In this case, two grooves may be provided vertically.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and various changes can be made without departing from the spirit of the invention.

[Effects of the Invention As is clear from the explanation below, according to the print head of the present invention, the print head provided on the tip guide plate is printed on the back side of the tip guide plate provided at the tip of the nose portion. Since a groove is formed that opens at the edge of the leading end guide plate and extends so as to sequentially connect a plurality of through holes that guide the wires in an aligned state, it is easy to push the printing wire into the through holes. This has the excellent effect of improving assembly workability.

[Brief explanation of drawings]

Figures 1 to 5 show a full-length embodiment of the present invention, with Figure 1 being an enlarged perspective view of the tip guide plate portion, and Figure 2 being an enlarged view showing how the printing wire is inserted into the groove. FIG. 3 is an exploded perspective view of the print head, FIG. 4 is an overall perspective view of the main body and nose section assembled, and FIG. 5 shows how the printing wire is inserted into the groove. It is a perspective view of the whole. Further, FIGS. 6 and 7 are views corresponding to FIGS. 1 and 2, respectively, showing other embodiments of the present invention. 1] Figures 8 to 11 show conventional examples, respectively.
It is a figure equivalent figure. In the drawing, 11 is a printing head, 12 is a printing wire, 13 is an actuator, 14 is a main body, 15 is a nozzle part, 15a is an open surface, 20.31 is a tip guide plate, 23 is a through hole, 24
．． 32 indicates a groove.

Claims (1)

[Claims] 1. A main body having a plurality of printing wires and an actuator disposed at the base end of these printing wires to selectively protrude the printing wires, and a nose that houses the printing wires and is provided on the front surface of the main body. a tip guide plate provided at the tip of the nose portion and having a plurality of aligned through holes into which the tip portions of the printing wires are inserted and guide the printing wires; A print head comprising: a groove formed on the back surface of a leading edge guide plate, extending to sequentially connect the plurality of through holes, and opening at an edge of the leading edge guide plate.