JPS5815177Y2 - Printing mechanism - Google Patents

Description

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

Conventionally, this type of printing mechanism has been complicated because it has two mechanisms: a drive mechanism for the letter wheel and a drive mechanism for bringing the ink roller into contact with the drive mechanism.

When the character wheel is brought into contact with the ink roller and then the type is pressed onto the printing surface, if the character wheel rotates even slightly, the characters become unclear.

From this point of view, this invention uses only one drive mechanism to rotate the character wheel and bring it into contact with the ink roller to apply ink, and at the same time, to apply ink to the character wheel with the ink-coated characters facing the printing surface. The present invention proposes a printing mechanism in which printing is performed by stopping the rotation and pressing the wheel/character wheel against the printing surface.

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

In the figure, a drive lever 12 is mounted on a substrate 11 so as to be rotatable about a shaft 13 attached to one end.

In the figure, the drive lever 12 is formed into an L-shape, and a holding lever 12 is attached to the substrate 11 at the end opposite to the shaft 13 so as to be rotatable about the shaft 5 at one end. mounted on.

The holding lever 14 is a relatively large plate-like member, and a rotary lever 15 is held on the holding lever 14 so as to be rotatable about a shaft 36 .

A wheel 16 is attached to the end of the rotating lever 15 so as to be rotatable about a shaft 17.

A gear 18 is fixed on the shaft 17 of the character wheel 16, and this gear 18 meshes with a fixed gear 19 fixed on the holding lever 14.

The character ring 16 is in contact with the circumferential surface of an ink roller 21, and the ink roller 21 is held on the substrate 11 by a support piece 22.

The drive lever 12 is connected to a plunger 24 of a plunger solenoid 23 mounted on the board 11, and in the figure, the plunger solenoid 23 is energized and the plunger 2
When the lever 4 is retracted, the lever 12 rotates counterclockwise around the shaft 13.

This rotation causes the rotation lever 15 to rotate, and this rotation causes the character wheel 16 to rotate.

In other words, the center of the fixed gear 19 and the axis 36 of the rotating lever 15
are matched.

Accordingly, the rotation of the rotation lever 15 causes the gear 18 to rotate around the circumferential surface of the gear 19 due to the meshing of the gears 18 and 19.

This causes the character wheel 16 to rotate counterclockwise, and the character 2
6 comes into contact with the ink roller 21.

In order to drive the rotary lever 15 by the drive lever 12, the side edge of the end of the drive lever 12 is bent approximately at right angles to the plane of the lever 12, and The edge engages with the side edge of the pivot lever 15.

In this way, the character ring 16 rotates, and when the ink is applied to the type 26 and faces the printing surface 27, the end of the rotary lever 15 is moved to the first stopper pin 32, which is erected on the holding lever 14. The rotational position is maintained by engaging with the rotation position.

Therefore, the rotating lever 15 cannot be rotated relative to the holding lever 14, and when the drive lever 12 is further rotated, the holding lever 14 is biased by the return spring 30 attached between the shaft 5 and the base plate 11. It is rotated against the force, and the type 26 is pressed against the printing surface 27.

When the bias against the plunger solenoid 23 is stopped, the holding lever 14 is rotated clockwise by the return spring 30 and returns to its original position by colliding with the fixing pin 29 set on the board 11. A return spring 31 is attached between the rotating lever 15 and the holding lever 14.
The drive lever 12 is also rotated clockwise by this rotation, and with the plunger 24 pulled out, the rotation lever 15 is rotated clockwise around the shaft 36.
8, its rotation is prevented and it returns to its initial state.

At this time, the gear 18 rotates clockwise due to the meshing of the gears 18 and 19, the type 26 also returns to its original position, and the ink roller 2
It stops at the position where it passes 1.

As described above, according to the printing mechanism according to this invention, the driving is performed only on the drive lever 12, and there is no need to move the ink roller 21.

The overall mechanism is relatively simple, with 16
, apply ink to the type 26, and print on the printing surface 2.
7, the rotation of the character wheel 16 is prevented and the character wheel 16 is held in that state and pressed against the printing surface 27, so that the print is clear and does not shift. can get.

[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 side view thereof. 11: Board, 12: Drive lever, 14: Holding lever, 1
5: Rotating lever, 16: Character wheel, 18: Gear, 19: Fixed gear, 21: Ink roller, 26: Type, 27: Print surface, 28: Stopper pin, 30. 31: Return spring.

Claims (1)

[Scope of utility model registration request] A drive lever, a rotary lever rotated by the drive lever, a character wheel rotatably mounted on the rotary lever, an ink roller that rotates in contact with the character wheel, and an ink roller that rotates in contact with the character wheel. A gear fixed on a shaft, a fixed gear meshing with the gear, and a rotating lever to which the fixed gear is attached and rotatably holds the rotating lever, and is provided so as to be rotatable relative to the fixed part. A printing mechanism comprising a holding lever and a stopper attached to the holding lever so as to prevent rotation of the rotating lever when the character wheel reaches a predetermined rotational position.