JPS5819636Y2 - injisouchi - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a printing device used, for example, in computers, registers, and the like.

Conventionally, there is a hammer that rotates with one end as a fulcrum and is held in a comb-like groove formed in a non-printing guide, but such a hammer stops the movement of the hammer in directions other than the printing direction. This has the disadvantage that the printing becomes unclear.

In addition, in order to hold multiple hammers close to each other, there are hammer guides in which the parts other than the printed part of the hammer are made thin, and a guide hole or guide groove into which the thin part is inserted is formed in the hammer guide. In such a case, not only is it difficult to manufacture the hammer, but the movement of the hammer in directions other than the printing direction cannot be stopped.

If the outer diameter of the hammer is the same size from the tip (printed part) to the end 1, it will be easier to manufacture the hammer, but for line printers, the pitch of the hammer needs to be small, so the hammer When guide holes and guide grooves are formed in the hammer guide to hold the guide holes, the width of the crosspieces (or protrusions) remaining between the guide holes (or guide grooves) will be smaller than the plate thickness of the hammer guide. be.

Therefore, the rigidity of the crosspieces and protrusions that hold the hammer is reduced, and the hammer guide cannot be manufactured by a simple method such as press working.

This invention was made in view of the above-mentioned points, and aims to provide a printing device that can increase the strength of the hammer guide and make it easier to manufacture the hammer guide and the hammer.

This invention consists of opposing hammer guides that form guide portions with the same pitch as the digit pitch of the printing drum, with the central part having a thickness that almost matches the digit pitch, and the thickness of both sides of the central part being thin. a hammer that is slidably fitted into the guide portion of the printer guide; a trigger that is operated in response to a printing command is rotatably fixed to one end of the central portion of each of these hammers; is arranged to face the printing drum.

Therefore, the guide part of the hammer guide is formed by a notch, etc., but since both sides of the hammer are formed thin, the comb-shaped shape formed by the notch and protrusion prevents problems during press working. The hammer itself has a wall thickness at the center that almost matches the girder pitch, so the printing surface can be set large, and the connection with the trigger can be made through the thick wall at the center. As a result, the connected state is reliable and stable, the mass of the hammer can be set as required, and the hammer can be manufactured by press working.

An embodiment of this invention will be described based on the drawings.

1 is a printing drum on which numbers from O to 9 are provided protrudingly for each digit.

The lower half of the printing drum 1 is surrounded by a paper stopper 2.

Paper 4 inserted through two paper guides 3 is brought close to this paper stopper 2.

5 is a hammer provided adjacent to each digit.

Both sides of these hammers 5 are crushed by a press or the like along the longitudinal direction to form stepped portions 6.

The thickness of these stepped portions 6 is determined to be approximately half the thickness of the printed portion 7 at the tip.

Further, a stopper piece 8 that projects outward is formed midway in the longitudinal direction of the step portion 7 .

Furthermore, the tip of a trigger 9 is rotatably jointed to the rear end of the hammer 5.

U-shaped hammer guides 10 are provided on both sides of the hammer 5 to face each other.

The inner edges of the upper plate part 11 and the lower plate part 12 of these hammer guides 10 are provided with guide notches 1 having a width that allows the step part 6 of the hammer 5 to slide without play.
3 are pressed at the same pitch as the arrangement pitch of the hammers 5.

Therefore, the widths of the guide notches 13 and the pieces of meat 14 produced when forming the guide notches 13 are approximately the same.

The hammer 5 is always urged downward by a leaf spring 15, and the stopper piece 8 is resiliently abutted against the lower plate portion 12.

Each of the triggers 9 is urged by a tension spring 16 in a direction away from the power shaft 1B having a protrusion 17, and is guided by a guide frame 19 in the direction of rotation thereof.

Next, a trigger lever 20 whose tip abuts on the trigger 9 is rotatably provided for each digit.

These trigger levers 20 are guided in their rotational direction by a guide frame 21, and their rear ends are connected via connecting wires 22 to armatures (not shown) of magnets (not shown) provided for each digit. This is what has been done.

For such a configuration, when an operation key (not shown) is pressed, the magnet of the digit to be printed is energized, and the armature operates to rotate the trigger lever 20 counterclockwise via the connecting wire 22. .

As a result, the rear end of the trigger 9 moves within the rotation locus of the protrusion 17 of the power shaft 18, which is constantly rotating, and the protrusion 1
Kicked away by 7.

Therefore, the hammer 5 collides with the printing drum 1 via the paper 4, thereby performing printing.

At this time, since the hammer 5 is held by the four guide notches 13 on both sides and the top and bottom, the straightness is maintained, so that clear printing can be obtained.

Further, since the width of the guide notch 13 of the hammer guide 10 matches the thickness of the stepped portion 6, which is thinner than the thickness of the printed portion 7, the width of the piece of meat 14 increases.

As a result, the strength of the hammer guide 10 does not decrease locally, and the vibration of the hammer 5 during printing is also reduced.

Therefore, from this point of view as well, the printed state can be made clearer.

Moreover, by making the width dimensions of the guide notch 13 and the meat piece 14 substantially equal, pressing for forming the guide notch 13 becomes easy.

Furthermore, with this type of hammer, the outer diameter is usually determined by shaving after blanking.
The hammer 5 of this embodiment has a step portion 6 and can be manufactured relatively easily by pressing without the need for cutting.

That is, after blanking, both sides are crushed with a press to form the stepped portion 6, and then the outer diameter is formed while leaving the stopper piece 8.

In the final process, since the plate thickness is thin, there is no need for press molds and the outer diameter dimensions are highly accurate.

Furthermore, by appropriately increasing or decreasing the width of the stepped portion 6, the hammer 5 can be
By changing the mass of the print head, it is also possible to set the collision force, which affects the clarity of printing, to an appropriate value.

Since this device is constructed as described above, even if the guide parts that hold a plurality of hammers are arranged in the hammer guide at a small pitch, the width dimensions of the guide parts and the pieces of meat produced when forming these guide parts are almost equal. This prevents the hammer guide from becoming locally weak in strength and prevents unclear printing due to vibration of the knob during printing. The hammer guide can be easily manufactured using a press by using a scale that has a specified strength even for the pieces of meat that are removed by removing soil, and furthermore, the mass can be determined appropriately by changing the width dimension of the center part of the hammer. This allows you to check the clarity of the print.Also, since the trigger is rotatably fixed to the center of the hammer, the wall thickness of the mounting part is large, which makes it possible to It is possible to achieve effects such as accurate positioning, good fitting stability, withstand high loads, and high durability.

[Brief explanation of drawings]

The drawings show one embodiment of this invention; Fig. 1 is a side view, Fig. 2 is a perspective view of the hammer, and Fig. 3 is a partially cutaway plan view of the hammer guide that holds the hammer. It is. DESCRIPTION OF SYMBOLS 1...Printing tram, 5...Number, 9...Trigger, 10...Hammer guide, 13...Guide notch (guide part).

Claims (1)

[Scope of utility model registration request] Forming a guide part with the same pitch as the digit pitch of the printing drum...Mer guides are provided facing each other, and the center part has a thickness that almost matches the digit pitch, and both sides of the center part are made thinner. A hammer is provided that is slidably fitted into the guide portion of the hammer guide, a trigger that is operated in response to a printing command is rotatably fixed to one end of the center portion of each of these hammers, and the other end is fixed to the center portion of each of these hammers so as to be slidably fitted to the guide portion of the hammer guide. A printing device characterized by facing a drum.