JPH055012Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a connection structure for a printing lever used in, for example, a spring-charged impact type printer head.

(Prior Art) Conventionally, as a connection structure for printing levers, a two-stage mounting part supports both ends of a torsion spring made of thin plate material or wire, and the printing lever is connected in a direction perpendicular to the torsion spring. There is also an extended version of the printing lever, which prints by driving a printing element connected to the tip of the printing lever.

(Problem to be solved by the invention) However, among the conventional examples mentioned above, those that use thin plate materials as torsion springs have weak rigidity in the longitudinal direction (extending direction) of the printing lever, and therefore, torsional vibration during printing Additionally, vibrations along the length of the printing lever may occur, which may cause the printing element to not be driven in the correct direction, resulting in poor printing performance.

An object of the present invention is to provide a connection structure for a print lever for a printer that increases the rigidity of a torsion spring in the longitudinal direction of the print lever so that the print element is always driven correctly.

(Means for Solving the Problems) The feature of the present invention is that both ends of a thin plate-like torsion spring are supported by the mounting portion, and the print lever is inserted from the front side of the torsion spring in a direction perpendicular to this surface. In this printer, a reinforcing rib extending substantially perpendicularly to the printing lever is provided on at least one surface of the torsion spring to drive a printing element connected to the tip of the printing lever. It's in a certain place.

(Function) The torsion spring has increased rigidity in the longitudinal direction of the print lever due to its reinforcing ribs, and the torsion spring vibrates in the correct direction.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the present invention integrates a printing lever 1, a mounting portion 2 of the printing lever, and a thin plate-shaped torsion spring 3 connecting the printing lever and the mounting portion. It was originally formed.

By the way, the mounting part 2 has mounting screws 2.
A is engraved on one end (left end) of this attachment part, and it is in a two-step shape, and both ends of a thin plate-shaped torsion spring 3 are connected to the inner surface of this two-step part. There is. From the center of the front surface of the torsion spring 3 (the left side in FIG. 1), the printing lever 1 is formed to extend in a direction perpendicular to this surface.
A printing element 4 connected to the tip 1b of this printing lever is driven. The front end of the torsion spring 3 has a base end 1 of the printing lever.
Reinforcing ribs 3a and 3b extending from a to both inner surfaces of the two-step portion of the mounting portion 2 are provided. Therefore, as shown in FIG. 3, the cross-sectional shape of the torsion spring 3 is T-shaped due to the protruding reinforcing ribs 3a and 3b. ), the printing lever 1 is less likely to vibrate in the extending direction, and the printing element 4 repeatedly advances and retreats at the correct position to print.

As described above, the present invention has a thin plate-like torsion spring 3 extending from the base end 1a of the printing lever 1 in both directions perpendicular to the longitudinal direction of the printing lever (vertical direction in FIG. This prevents the deterioration of printing characteristics that had previously occurred.
The intermediate portion 1c of the printing lever 1 is a movable yoke portion, and the driving force of the printing element 4 is transmitted from an electromagnetic drive device (not shown). That is, the printing lever 1 is attracted by the force of the permanent magnet of the electromagnetic drive device, and the force of the permanent magnet is canceled and released by energizing the drive coil.
The torsion spring 3 is the center of rotation, and its torsional vibration causes the tip 1b to vibrate up and down in FIG.
The printing element 4 is driven to print.

Another embodiment of the torsion spring is shown in FIG. 4. In this example, reinforcing ribs 13a and 13b are provided on both sides of the torsion spring 13,
That is, this protrudes back and forth in the longitudinal direction of the printing lever, and has a cross-shaped cross-section. Note that the same effect can be obtained even if the torsion spring has an L-shaped cross section.

Figure 5 shows another example of the printing lever.
The printing lever 11 has a base end portion 11a and an intermediate portion 11c.
are integrally formed, and a distal end portion 11b is formed as a separate member, and the distal end portion 11b is inserted into a groove of the intermediate portion 11c and connected.
Torsion spring 3, mounting part 2 and printing element 4
are substantially similar to those shown in the first figure, and are given the same reference numerals.

(Effects of the invention) In the present invention, since the torsion spring is provided with a protruding reinforcing rib, the rigidity of the torsion spring in the extending direction of the print lever is increased, and vibrations in that direction can be prevented or suppressed. For this reason, the printing element is always driven forward and backward at the correct position, and printing characteristics are not impaired.

[Brief explanation of the drawing]

Fig. 1 is a plan view, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is an enlarged sectional view of the torsion spring, and Fig. 4 is an enlarged sectional view of the torsion spring.
The figure is an enlarged sectional view showing another example of a torsion spring.
FIG. 5 is a sectional view showing still another example of the present invention. 1...Print lever, 2...Mounting part, 3...Torsion spring, 3a, 3b...Reinforcement rib, 4...
Printing element, 11...Print lever, 13...Torsion spring, 13a, 13b...Reinforcement rib.

Claims (1)

[Claims for Utility Model Registration] An attachment part, a thin plate-like torsion spring whose both ends are supported by the attachment part, and a printing element extending from the front surface of the torsion spring in a direction perpendicular to this plane. A printing lever for a printer, comprising: a printing lever that drives the torsion spring; and a reinforcing rib that projects from at least one surface of the torsion spring and extends substantially perpendicularly to the printing lever. Connected structure.