JPS5815176Y2 - Printing mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a printing mechanism that prints by applying ink to a character ring and bringing the character ring into contact with a printing surface.

In the conventional printing mechanism of this type, an ink roller is brought into contact with a character wheel, and the character wheel with ink applied thereto is brought into contact with a surface to be printed to perform printing.

This type of device has the disadvantage that it has two movable parts, one for moving the letter wheel and the other for moving the ink roller, making the mechanism complicated.

It is also conceivable to apply ink to the character wheel by bringing the character wheel into contact with an ink roller and rotating it, and then bringing the ink-covered character wheel into contact with the printing surface.

In this case, if the character ring rotates even slightly while in contact with the printing surface, the printed characters will shift and become unclear.

This idea is based on this point, by rotating the drive lever □, the letter wheel attached above is rotated and brought into contact with the ink roller, and when the ink is applied, the letter wheel stops rotating. The printed characters are then pressed onto the surface to be printed and printed.

By making the rotation diameter of the drive lever relatively large, clear printing can be performed without shifting the printed characters, and only one drive mechanism is required, making it possible to configure the device with a relatively simple mechanism.

The printing mechanism according to this invention will be explained below with reference to the drawings.

A shaft 12 is set up on the board 11, and a drive lever 13 is attached to it.
is rotatably mounted.

One end of this drive lever 13 is connected to a plunger solenoid 14.
The plunger 15 is connected to the plunger 15.

A return spring 16 is stretched between the drive lever 13 and the base plate 11 on the opposite side of the connection end with the plunger 15, and the drive lever 13 is biased in a direction to pull out the plunger 15 from the solenoid 14.

The drive lever 13 is a stopper pin 1 set up on the board 11.
Rotation is prevented at 7.

A wheel 18 is rotatably attached to the end of the drive lever 13 opposite to the plunger 15.

An ink roller 19 that can be in rotational contact with the character wheel 18
is rotatably attached to a support arm 21, and the arm 21 is fixed to the substrate 11.

The type 22 of the character wheel 18 is rotated relative to the ink roller 19 when the drive lever 13 is driven and rotated.
The positional relationship is such that it contacts and rotates.

The character wheel 18 rotates, and the rotation of the character wheel 18 is prevented in a state where the printed characters 22 face the printing surface 23.

For this purpose, a protrusion 24 is protruded from the circumferential surface of the character wheel 18, and when the printed character 22 faces the printing surface 23, it comes into contact with a stopper pin 25 erected on the drive lever 13.

That is, when the plunger solenoid 14 is energized and the plunger 15 is retracted, the drive lever 13 is rotated counterclockwise in the figure, and the type 22 is moved to the ink roller 19.
The character wheel 18 also rotates counterclockwise in the figure.

An L-shaped metal fitting 26 is erected on the base plate 11 to allow this rotation, and its end is parallel to the base plate 11 and the L-shaped metal ring 18
located on the opposite side of the board.

A coil spring 29 is stretched between a pin 27 erected on the L-shaped metal fitting 26 and a pin 28 erected on the ring 18.

When the lever 13 is rotated counterclockwise, the character ring 18 is pulled by the spring 29 and similarly rotated counterclockwise, so that the type 22 faces the printing surface 23. In this state, the protrusion 24 acts as a stopper. 25 and the type 22 is printed on the printing surface 23
It is maintained in a state opposite to.

Furthermore, the drive lever 13 rotates and prints 22 on the printing surface 23.
is contacted.

When the biasing force on the plunger solenoid 14 is stopped, the drive lever 13 is returned clockwise by the return spring 16, but in this case, the wheel 18 must also be rotated clockwise to be returned.

For this purpose, a guide plate 31 is mounted on the L bracket 26, and the pin 28 collides with the cam surface 31a of the guide lever 31 when the drive lever 13 returns.

The cam surface 31a is formed on the ink roller 19 side,
Therefore, the pin 28 is guided by this cam surface 31a, and the shaft 30 of the character wheel is located closer to the ink roller 19 than the pin 28 (on the left side in the figure), so the character wheel 18 rotates clockwise; When rotating while pulling the spring 29, the pin 2 is attached to the edge 31b of the cam surface 31a of the guide plate 31.
8 is positioned, this pin 28 is located slightly on the side of the ink roller 19 with respect to the shaft 30, that is, on the left side in the figure.

Therefore, the pin 28 moves along the side edge of the guide plate 31.

In this case, the protrusion 24 abuts against a pin 33 set on the drive arm 13 to prevent the character wheel 18 from rotating too much and is held in the initial state.

As described above, according to the printing mechanism according to this invention, when the drive lever 13 is rotated, that is, when a print command is given and driven, the character wheel 18 rotates while contacting the ink roller 19, and ink is applied to the type 22. attached, this type 22
When the character wheel 18 faces the printing surface 23, the rotation of the character wheel 18 is stopped and this state is maintained), and the drive lever 13 continues to rotate, pressing the type 22 against the printing surface 23.

Since the character wheel 18 is printed while its rotation is stopped, there is no misalignment between the printing surface and the type, and in particular, the rotation radius of the drive lever 13 can be made relatively large, so there is virtually no misalignment. It is possible to make it a state.

Moreover, the type 18 can be sufficiently inked by rotating while contacting the ink roller, and there is no need to move the ink roller 19 to contact the character wheel, and the structure is simple with only one drive mechanism. be.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of the printing mechanism according to this invention.
FIG. 2 is a left side view with the ink roller removed, and FIGS. 3 and 4 are plan views showing the printing mechanism according to this invention during its operation. 13: Drive lever, 14 Ni lunge solenoid, 16
: Return spring, 17, 25, 33 : Stopper pin, 18
: Character wheel, 19: Ink roller, 22: Type, 23: Print surface, 29: Coil spring, 31: Guide plate.

Claims (1)

[Scope of utility model registration request] A drive lever that rotates when printing, a character wheel that is rotatably mounted on the drive lever, an ink roller that comes into contact with the character wheel, and a suspension between a fixed part and the character wheel. a coil spring that rotates the character wheel when the drive lever rotates in the printing operation direction; and a coil spring that prevents the character wheel from rotating when the character wheel faces the printing surface due to the rotation of the character wheel. and a guide plate that engages with the letter wheel so as to reverse the letter wheel when the drive lever returns, and further includes a stopper that engages with the letter wheel so as to reverse the letter wheel when the drive lever returns, and further includes a stopper that engages with the letter wheel so as to reverse the letter wheel when the drive lever returns, and further includes a stopper that engages with the letter wheel so as to reverse the letter wheel when the drive lever returns, and further includes a stopper that engages with the letter wheel so as to reverse the letter wheel when the drive lever returns. A printing mechanism that rotates to print.