JPS6229255Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printing device, more specifically, a mechanism for adjusting the printing strength of a hammer in a printing device.In particular, it is an object of the present invention to provide a mechanism for adjusting the printing strength of a hammer that has a simple structure and is easy to adjust. purpose.

The details of the present invention will be explained below with reference to an embodiment shown in FIGS. 1 and 2.

In the figure, reference numeral 1 denotes a rotatably held drive lever, which consists of an armature part 1a facing an electromagnet 3 and a drive part 1b facing a hammer 4, with the fulcrum of the shaft 2 as a boundary. 5 is the drive lever 1
a spring that constantly applies a rotational force in the clockwise direction; 6;
is a stopper.

Reference numeral 7 denotes a type wheel rotated (for selecting type) by a drive motor 8, and is provided with a large number of type fingers 9 extending radially from its center. 9a is a type part at the tip of a type finger.

10 is a platen, and 11 and 12 are ink ribbons and paper located between the platen 10 and the type wheel 9, respectively. By striking the platen 10 through the paper 12, a desired symbol is printed on the paper 12.

Numeral 13 denotes an oblong hole formed in the driving portion 1b of the driving lever 1, and a roughly U-shaped hammer weight 14 is fixed in a predetermined position in the oblong hole 1b by a fastening screw 15 which passes through the oblong hole 13 and has its tip screwed into the hammer weight. That is, by loosening the fastening screw 15, the hammer weight 14 can slide freely within the oblong hole 13, and by fixing the slid hammer weight 14 at a desired position within the oblong hole 13 by the fastening screw 15, the weight distribution of the driving portion 1b of the driving lever 1 can be freely set. Numeral 16 denotes the oblong hole 13.
It is a scale formed along the line.

Therefore, the drive lever 1 is attracted by the electromagnet 3 and rotates in the direction of the arrow in FIG. 1 to strike the hammer 4.
By adjusting the distance of the hammer weight 14 from the rotational fulcrum, the weight distribution of the driving part 1b, especially the head part of the driving part 1b that collides with the hammer 4, changes, and therefore the hammer 4 is impacted. By changing the driving energy, the hammer 4 impacts the type portion 9a with a desired printing strength.

In the above-described embodiment, the electromagnet 3 is used as the drive source for the drive lever 1, but it is also possible to adopt a method in which the drive lever is driven by a pawl wheel that is continuously rotated by a motor in synchronization with a type drum or the like. Of course, the shape of each part can be modified in various ways without departing from the technical idea of the present invention. For example, the hammer weight itself may be engaged with the slit or groove of the drive lever, The hammer weight may not be adjusted by sliding as in the above-mentioned embodiments, but may be adjusted by rotation.

As mentioned above, according to the present invention, the attachment position of the hammer weight to the drive lever is adjustable, so the printing strength of the hammer can be adjusted according to the number of sheets of paper, thickness, etc., and the desired printing density can be achieved. can get. Further, since the adjustment mechanism is simply attached to the drive lever so that it can be moved by a predetermined amount, the construction thereof is not only extremely simple, but also enables fine adjustment of printing strength. Furthermore, by preparing several types of hammer weights with different weights, it is possible to widely and finely adjust the printing strength. Overall,
It is possible to provide a hammer printing strength adjustment mechanism with a simple structure and easy adjustment, and its practical value is remarkable.

[Brief explanation of the drawing]

The drawings all relate to one embodiment of the present invention, with FIG. 1 being a partially simplified explanatory diagram of the hammer mechanism, and FIG. 2 being a perspective view of the main part. 1... Drive lever, 3... Electromagnet, 4... Hammer, 9... Type wheel, 10... Platen, 13...
...Long hole, 14...Hammer weight, 15...Tightening screw.

Claims (1)

[Scope of utility model registration request] In a configuration comprising a drive lever that is rotated by a drive source such as an electromagnet and a hammer that is driven by the drive lever, printing intensity can be adjusted to freely move near and far from the center of rotation of the drive lever. 1. A printing device characterized in that the hammer weight is provided with fixing means such as a tightening screw for fixing the hammer weight to the drive lever at a predetermined position of the drive lever.