JPH0340606Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a print head support structure in a dot line printer.

[Prior Art] The print head of a dot line printer has printing wires arranged in a horizontal row, and the print head prints one line by repeatedly moving back and forth to the left and right for multiple characters. ing.

The printing head is fixed to an elongated shuttle holder having a length along the printing head, and the shuttle holder is slidably provided on a horizontally disposed shuttle guide shaft. One end of a connecting rod is rotatably connected to the shuttle holder, and the other end of the connecting rod is eccentrically rotated by an eccentric shaft driven by a motor, thereby connecting the shuttle holder to the shuttle holder. The printing head is designed to move back and forth from side to side. In addition, as this type of print head support structure,
For example, Japanese Patent Application Laid-open No. 102338/1983 is cited.

[Problems to be solved by the invention] Since the shuttle holder that supports the conventional print head has a length along the print head, the weight of the shuttle holder makes it difficult for the print head to move back and forth. There was a problem that the excitation force increased and the vibration of the printer increased. Regarding machinability, in a long shuttle holder, the distance between the left and right holes inserted into the shuttle guide shaft is long, and these left and right holes must be formed concentrically, so it is necessary to improve hole machining accuracy. is difficult and costly. Furthermore, it needs to be manufactured using a large mold, which increases costs in terms of mold costs, shuttle holder material costs, etc.

The purpose of this invention is to reduce the weight of the shuttle holder, thereby reducing the excitation force and vibration of the printer.The purpose of this invention is to provide a printing head support structure for dot line printers that can significantly reduce costs. Our goal is to provide the following.

[Means for solving the problem] As shown in FIG. It becomes connected to.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the left and right sides of the print head 1 are fixed to a left shuttle holder 2 and a right shuttle holder 3 by two screws 4, respectively. The left and right shuttle holders 2 and 3 have a left shuttle guide shaft 5 that is horizontally and concentrically arranged.
and the right shuttle guide shaft 6, respectively, so as to be slidable therein. The left and right shuttle guide shafts 5 and 6 are each fixed to a frame 7 with screws 8.

One end of a shuttle shaft 10 is fixed to the left shuttle holder 2, as shown in FIG.
Two bearings 11 are installed at the other end of the shuttle shaft 10.
A and B are installed. One bearing 11A is a leaf spring 1 fixed to the frame 7.
2 from above, and the other bearing 1
1B is pressed against the frame 7. Further, one end side of a connecting rod 14 is rotatably disposed on the shuttle shaft 10 via a bearing 13. A connecting rod holding plate 15 is supported on the shuttle shaft 10, and the connecting rod holding plate 15 is fixed to the left shuttle holder 2 with screws 16.

Returning to FIG. 1 again, an eccentric shaft 21 is rotatably disposed at the other end of the connecting rod 14 via a bearing 20. As shown in FIG. The eccentric shaft 21 is eccentrically fixed to an output shaft 22a of a motor 22 fixed to a frame. Further, a flywheel 23 is fixed to the output shaft 22a of the motor 22.

Therefore, when the output shaft 22a of the motor 22 rotates, the eccentric shaft 21 rotates eccentrically, and the left shuttle holder 2 moves left and right along the left shuttle guide shaft 5 via the connecting rod 14, bearing 13, and shuttle shaft 10. The print head 1 also reciprocates together with the left shuttle holder 2. Further, the right shuttle holder 3 also reciprocates along the right shuttle guide shaft 6 together with the print head 1.

As described above, the shuttle holder consists of two parts, the left shuttle holder 2 and the right shuttle holder 3, and there is no intermediate part, so the weight of the entire swing system is greatly reduced. This reduces the excitation force and
Reduces printer vibration. In addition, regarding machinability, it is only necessary to form holes in the two shuttle holders 2 and 3 to be inserted into the shuttle guide shafts 5 and 6, respectively, which makes machining very easy, and even if the holes have a certain degree of rough precision, By making adjustments during assembly, this can be absorbed and smooth movement can be achieved, resulting in a significant reduction in processing costs. In addition, since the shuttle holders 2 and 3 are small, a small mold is required, which reduces the mold cost, and
Material costs for the shuttle holders 2 and 3 can also be reduced.

FIG. 3 shows the structure of the sliding portion between the left shuttle holder 2 and the left shuttle guide shaft 5. As shown in FIG. The left shuttle holder 2 is slidably disposed on the left shuttle guide shaft 5 via two bearings 30 and 31, and a felt 32 containing oil is disposed between the two bearings 30 and 31. It is set up. Although not shown, the sliding portion between the right shuttle holder 3 and the right shuttle guide shaft 6 also has a similar structure.

By arranging the felt 32 between the two bearings 30, 31 in this way, the oil splatter on the felt 32 can be prevented from flowing between the bearings 30, 3 with a very simple structure.
1 can prevent this and stabilize the lubrication.

Figure 4 shows print head 1 and left shuttle holder 2.
and the positioning and fixing structure with the right shuttle holder 3 are shown. In dot line printers, it is very important to horizontally arrange the print wires provided in the print head 1 in order to improve print quality. Therefore, one of the two screws 4 that fix the print head 1 to the left shuttle holder 2 and one of the two screws 4 that fix the print head 1 to the right shuttle holder 3 are fixed. The fixing portions of each are constructed as shown in FIG. A pipe 40 is installed in the left and right shuttle holders 2 and 3 so as to protrude toward the print head 1 side, and a screw 4 is screwed into the positioning hole 1a into which the pipe 40 is inserted in the print head 1. A threaded portion 1b is formed. The pipe 40 has a threaded portion 40a into which the screw 4 is screwed, and a hole 40b. Further, a constricted portion 4c having a smaller diameter than the threaded portion 4a is formed between the threaded portion 4a and the head 4b of the screw 4. Note that 41 indicates a washer.

Therefore, by inserting the positioning holes 1a of the print head 1 into the pipes 40 fixed to the left and right shuttle holders 2, 3 and tightening the screws 4, the print head 1 can be attached to the left and right shuttle holders 2, 3. The position is fixed. In addition, a sufficiently long constriction 4c is formed on the screw 4, and the pipe 40
Since the print head 1 is removed from the left and right shuttle holders 2 and 3, when the screw 4 is loosened and the screw 4 is removed from the print head 1, the threaded portion 40a of the screw 4 is removed. pipe 40
The screws 4 do not come off from the threaded portions 40a of the screws 40a, and the screws 4 are prevented from falling from the shuttle holders 2 and 3, resulting in excellent workability and maintainability.

[Effects of the invention] As is clear from the above description, according to the invention, the shuttle holder is divided into two, a left-hand shuttle holder and a right-hand shuttle holder, and one shuttle holder is connected to the connecting rod. Therefore, the weight of the shuttle holder can be reduced, thereby reducing the excitation force and reducing the vibration of the printer. In terms of workability, it is very easy to process two shuttle holders, and the mold can be small, which reduces mold costs and reduces material costs for the shuttle holder, resulting in significant cost reductions. I can figure it out.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a side view of the main part of Figure 1, Figure 3 is a sectional view showing the structure of the sliding part between the left shuttle holder and the left shuttle guide shaft, and Figure 4 is the positioning of the print head and the left and right shuttle holders. FIG. 3 is a cross-sectional view showing the fixing structure. 1: Print head, 2: Left shuttle holder,
3: Right shuttle holder, 5: Left shuttle guide shaft, 6: Right shuttle guide shaft, 14: Connecting rod.

Claims (1)

[Scope of utility model registration request] A printing head having printing needles arranged along the printing line is supported by a shuttle holder, the shuttle holder is supported by a shuttle guide shaft so as to be reciprocating along the printing line, and
In a dot line printer connected to a shuttle drive mechanism for reciprocally driving a print head, the shuttle holder includes a left shuttle holder and a right shuttle holder, and one shuttle holder is connected to the shuttle drive mechanism. A print head support structure in a dot line printer characterized by: