JPS623236Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a printing device using a cassette type wheel.

Prior Art One of the major issues with cassette type wheels is how to connect the shaft of the drive means for driving the type wheel and the type wheel in accordance with the position in the rotational direction. be.

Purpose This invention aims to solve the above problems. In particular, the object is to provide a printing device in which the type wheel can be held in the cassette in the home position when the type wheel is uncoupled from the shaft of the drive means.

composition Embodiments of the invention will be explained in detail in the drawings.

In FIGS. 1 and 2, the cassette body 1
is formed of a transparent material so that the printed characters can be seen through, and a hammering opening 3 through which the hammer 2 enters and exits when printing by striking with a type hammer.
The portion provided with the cassette body 1 is formed as a thin finger rest 4 to facilitate handling of the cassette body 1 by the operator. The part of the cassette body 1 near the part where the finger hook 4 is provided is formed in an arc shape with a slight distance from the outer periphery of the type wheel 5 housed in the cassette body 1, and the type wheel 5 is shaped like an arc. This prevents the ribbon from tangling with the fingers it carries. The remaining portion is approximately rectangular in shape.

The cassette body 1 has a first wall 1a and a second wall 10 facing each other, and the second wall 10 can be formed as a removable lid. Cassette body 1
One end of the leaf spring 6 is fixed to the second wall 10 of the leaf spring 6, and the other end of the leaf spring 6 comes into contact with the hub portion of the type wheel 5, and the elastic force of the leaf spring 6 causes the type wheel 5 to be pushed into the cassette body 1. A leaf spring 6 is formed so as to press toward the first wall 1a.

One or more engagement grooves 7 are formed in a portion of the first wall 1a of the cassette body 1, as shown in FIG. can be engaged.

As shown in FIG. 2, the first wall 1a is provided with an opening through which a shaft 14 of a selection motor 13 serving as a driving means enters and exits.

The hub of the type wheel 5 is loosely engaged with the center hole 16 of the cassette body 1, and the type wheel 5 is supported by the cassette body 1 so as to be rotatable and movable within a certain range in the radial and axial directions.

When the second wall 10 of the cassette body 1 is formed as a lid, it is fixed with screws 11. Some of the screws 11 may also be used for fixing the leaf spring 6. The lid 10 is preferably made of a transparent material so that the type of the type wheel 5 can be confirmed. The lid 10 can cover the entire cassette body 1, but when considering the printing operation, it is preferable to keep about half of the cassette body 1 open, including the vicinity of the hammer opening, and cover the other half. Thereby, the impact by the hammer 2 and the upward and downward shifting of the ribbon 12 relative to the type wheel type portion 8 can be smoothly performed.

When the cassette main body 1 is in a storage state, the type wheel 5 is pressed against the first wall 1a by the pressing force of the leaf spring 6, and the boss of the type wheel and the center hole 1b of the cassette main body 1 cooperate with each other and the cassette main body 1 The type wheel 5 is held at the home position by the cooperation of the engaging groove 7 and the engaging protrusion 9 of the type wheel.

The engaging protrusion 9 and the engaging groove 7 can also be formed on the cassette body 1 and the type wheel 5, respectively, contrary to the illustrated example.

When the cassette main body 1 is installed in a predetermined position of the printing device by grasping the finger hook 4 and the shaft 14 of the selection motor 13 is inserted into the cassette main body 1 as shown in FIG. The shaft 14 is inserted into the hole. The shaft 14 then presses against the leaf spring 6 and releases the pressing force of the leaf spring 6 on the type wheel 5. At the same time, the type wheel 5 is moved in the axial direction by the shaft 14 to a position where the engagement between the engagement protrusion 9 and the engagement groove 7 is released, so that it can freely rotate. Since the type wheel 5 is held at the home position by the action of the engagement protrusion 9 and the engagement groove 7, the type wheel 5 is accurately aligned with the shaft 1 when the selection motor 13 is installed.
4 and the type wheel 5 can be set, and the drive pawl 1 transmits the driving force of the shaft 14.
5 can correctly engage the drive hole of the type wheel 5.

By simply inserting the cassette 1, positioning with respect to the platen 14 on which paper is wound, the paper presser 15, and the type hammer 2 can be performed as shown in FIG.

When not printing, the selection motor 13 has a control means for controlling the type wheel 5 to always rotate back to the home position, so when removing the cassette body 1 to replace the type wheel, When the selection motor shaft 14 is pulled out from the cassette, the type wheel 5 is moved to the first position of the cassette body 1 by the pressing force of the leaf spring 6.
Pressed against the wall 1a, the engagement protrusion 9 engages with the engagement groove 7, and the type wheel is held at the home position. The type wheel is therefore automatically held in its home position when the cassette is removed. This means that when the cassette is attached to the printing device, the type wheel is held in the home position and printing can be started immediately.

Effects According to the present invention, when the shaft of the driving means and the type wheel are disconnected from each other, the type wheel can be held at the home position by the spring means and the engaging portion of the first wall of the cassette. It became possible.

Furthermore, even when the shaft and type wheel are connected, the type wheel is held at the home position, so the rotational position does not shift.

[Brief explanation of the drawing]

Fig. 1 is a partially exploded perspective view of a cassette type wheel according to the present invention, Fig. 2 is a side sectional view, and Fig.
The figure is a partial perspective view showing the relationship between the cassette body and the type wheel. 1...Cassette body, 2...Type wheel,
6... Leaf spring (spring member), 7... Engagement groove, 8...
...Printed portion, 9...Engaging protrusion.

Claims (1)

[Claims for Utility Model Registration] A hammer for printing, a type wheel having a plurality of fingers provided with type, a cassette for accommodating the type wheel, and a cassette for rotating the type wheel. A printing device comprising a movable drive means having a shaft, an opening provided in a first wall of the cassette through which the shaft of the drive means enters and exits, and a second wall opposite to the first wall of the cassette. and a spring means provided between the type wheel and the type wheel for urging the type wheel toward the first wall; and a spring means provided on the first wall for engaging the type wheel and preventing rotation of the type wheel. and a control means for controlling the drive means to rotate the type wheel back to the home position when not printing, and by moving the drive means toward the type wheel. The shaft of the driving means and the type wheel are coupled together, and the engaging portion provided on the first wall of the cassette is disengaged from the type wheel, and the shaft of the driving means and the type wheel are disengaged from each other. 2. A printing device according to claim 1, wherein when the type wheel is disengaged, the type wheel is held at the home position by cooperation of the spring means and an engaging portion provided on the first wall of the cassette.