JPS6144851Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the printing mechanism of a Japanese typewriter.

As is well known, the printing mechanism of Japanese typewriters is
A push-up pin placed below the type box pushes up the desired type stored in the type box, and a type bar placed above the type box holds the pushed up type and moves it toward the platen. It rotates to perform printing.

By the way, recently there has been a trend towards semi-automatic or fully automatic Japanese typewriters. In this case, the type box is driven in the X and Y directions on the plane by an X-direction driving motor and a Y-direction driving motor, and a desired type from among the large number of characters stored in the type box is lifted above the push-up pin. The push-up pin is configured to drive the push-up pin by actuating a print activation solenoid in response to a print signal, and the push-up pin feeds the type into a type bar disposed above the type box. However, when the motor is in a stopped state, the rotor is stopped at a rotational position where the magnetic field inside the motor is stable. For this reason, when the desired type is positioned by being driven by the X motor and Y motor for driving the type box as described above, the type box may be slightly misaligned. This misalignment of the type box is corrected when the push-up pin moves forward to push up the type.

In this way, since the push-up pin pushes up the type while correcting the positional deviation of the type box, the speed of collision when pushing up the type varies depending on the presence or absence of positional deviation of the type box and its size. On the other hand, since a solenoid is used to drive the push-up pin as described above, it is difficult to control the push-up speed of the push-up pin in accordance with variations in the collision speed during push-up. For this reason, there was a drawback that insertion of printed characters into the type bar became unstable. To explain this in more detail, if the type box is not misaligned, the type will be inserted into the type bar with great force, and in extreme cases, it will push up the type stopper located above the type bar. If the positional shift of the type box is large, there may be insufficient force to push the type up and the type cannot be inserted to the correct position on the type bar, making printing impossible.

The present invention was devised in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a printing mechanism for a Japanese typewriter that allows characters to be inserted into the type bar in a stable state at all times.

Hereinafter, the present invention will be explained with reference to an illustrated embodiment. A large number of type characters 2 are housed in the type box 1 at regular intervals in the X and Y directions on a plane, and are driven in the X and Y directions by an X-direction drive motor and a Y-direction drive motor (not shown). A push-up pin 3 for pushing up desired type 2 is disposed below the type box 1, and this push-up pin 3 is fixed to one end of a type push-up lever 5 that rotates around a shaft 4. There is. A roller groove 5a is provided at the other end of the type push-up lever 5, and a roller 6 is slidably disposed in this roller groove 5a. The roller 6 is rotatably provided on a roller pin 7, and the lower end of a drive lever 8, which is provided to be movable up and down, is fixed to the roller pin 7. A return spring 9 is applied to the roller pin 7 and the type push-up lever 5, and the drive lever 8 is biased downward by the return spring 9. A shaft 1 is located below the head 8a of the drive lever 8.
A printing operating lever 11 that rotates around 0 is provided, and this printing operating lever 11 is actuated by a printing operating solenoid 12 to lift the lower surface of the head 8a upward, and is constantly supported by a tension spring 13. is biased in a direction away from the head 8a.

A type bar 21 that rotates around a shaft 20 is disposed above the type box 1, and this type bar 21 is connected to a lower limit stopper 22 and a platen 2.
It is configured to reciprocate between 3 and 3 by a drive mechanism (not shown). Further, the type bar 21 is provided with a type holding hole 21a, into which the type 2 is inserted, at a position directly above the push-up pin 3. In order to hold the type 2 inserted into the type holding holes 21a, the type bar 21 is slidably provided with a chuck bar 24 that engages with the notch of the type 2. Further, a type stopper 26 that rotates about a shaft 25 is provided above the type holding hole 21a so that the type 2 inserted into the type holding hole 21a does not jump out from the type bar 21.

The above is a conventionally known structure. In the present invention, a push-up pin buffer means 30 is provided on the type push-up lever 5. The push-up pin buffer means 30 includes a cylinder portion 31 rotatably attached to a frame body, and a cylinder portion 31 that is slidably disposed on the cylinder portion 31 and connected to the type push-up lever 5 via a connecting lever 32. The piston 33 is provided with a through hole 33a, and a valve 34 is disposed outside the through hole 33a so as to be openable and closable.

Next, the operation of this mechanism having such a configuration will be explained. Printing is performed manually by pressing a button (not shown).
The printing operation solenoid 12 is energized by pressing or by a signal stored in the machine in advance, and the printing operation lever 11 rotates in the direction of arrow A about the shaft 10. As a result, the drive lever 8 is pulled up in the upward direction shown by the arrow B, and as the roller 6 rises, the type push-up lever 5 rotates about the shaft 4 in the direction of the arrow C, and the push-up pin 3 moves into the type box. Push up the desired type 2 in 1. Then, the type 2 is pushed up from the type box 1 until it comes into contact with the type stopper 26 and inserted into the type holding hole 21a.

In the operation, when the type pushing lever 5 rotates in the direction of arrow C, the piston 33 moves in the direction of arrow D.
Since the through hole 33a is closed by the valve 34, the speed at which the push-up pin 3 collides with the type 2 is reduced. That is, when the type box 1 is not misaligned, the resistance to push up the type 2 is small and the type 2 is pushed up vigorously, but the buffering means 30 works as described above and the speed of the push-up pin 3 is reduced. Therefore, the type 2 is pressed against the type stopper 26 with an appropriate force and inserted into the type holding hole 21a of the type bar 21. Also, if the type box 1 is misaligned, the resistance to push up the type 2 is large;
Since the speed of the push-up pin 3 that pushes up the type 2 by that much is small, the damping effect of the buffer means 30 is reduced, and the type 2 is inserted by being pressed against the type stopper 26 with an appropriate force.

In this way, the positional shift of the type box 1, that is, the type 2
Since the damper force acts according to the resistance pushing up,
The type 2 is always stably inserted into the regular position of the type holding hole 21a of the type bar 21.

When the type 2 is inserted into the type holding hole 21a as described above, the chuck lever 24 moves forward in the direction of arrow E by timing means (not shown) and engages with the notch in the type 2. Next, the type stopper 26 rotates about the shaft 25 in the direction of arrow F. Subsequently, the type bar 21 rotates about the shaft 20 in the direction of arrow G, and presses paper (not shown) against the platen 23 to perform printing. After printing, it moves back in the reverse order of the above-mentioned operation.

In the above embodiment, an air damper is used as the buffer means 30, but an oil damper or the like may be used. Furthermore, although the method in which the push-up pin 3 is attached to the type push-up lever 5 and rotates has been described, the present invention can also be applied to a method in which the push-up pin 3 moves straight up and down. Further, the mounting position of the buffer means 30 is not particularly limited, and may be arranged at the push-up pin 3, for example.

As is clear from the above description, according to the printing mechanism of the Japanese typewriter according to the present invention, the printed characters are always inserted at the proper position of the type bar and are in a stable state.

[Brief explanation of the drawing]

The figure is a partially cross-sectional front view of essential parts showing an embodiment of the printing mechanism of the Japanese typewriter according to the present invention. 1... Type box, 2... Type, 3... Push-up pin, 5... Push-up lever, 11... Print operating lever, 12... Print operating solenoid, 21... Type bar, 30... Buffer means .

Claims (1)

[Scope of utility model registration request] A type box is driven and positioned in the XY direction on a plane by an X-direction drive motor and a Y-direction drive motor, a push-up pin disposed below the type box is driven by a printing operation solenoid, and the push-up pin is In the printing mechanism of a Japanese typewriter, the desired type stored in the type box is pushed up and fed into a type bar disposed above the type box. A printing mechanism for a Japanese typewriter, characterized in that a push-up pin buffering means consisting of an air damper or an oil damper is provided to suppress the collision speed of the push-up pin.