JPH025584B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing mechanism, and more particularly to a printing mechanism having a type wheel with type.

A type wheel with matrix type placed at the tips of many radial spokes is rotated at high speed, and when the selected type is positioned at a predetermined printing position, a printing hammer is energized in synchronization with this, and a blow is applied to the type. An impact printer is known that prints on printing paper on a platen by applying pressure to the printer. This type of printer has the excellent advantage of being able to print at high speed and maintain high print quality.

FIG. 1 shows a schematic structure of a conventional printer of this type.

In FIG. 1, the reference numeral 1 indicates a platen, and a type wheel 2 is disposed at a position facing the platen 1. The type wheel 2 has a large number of spokes arranged radially, and a matrix type is formed at the tips of the spokes. Reference numeral 3 denotes a motor, and a boss portion 2a of the type wheel 2 is fitted and fixed onto its output shaft 3a, and the type wheel 2 is rotated at high speed by the motor 3.

The type wheel 2 is fixed to the output shaft 3a by press fitting or screws, but the distance between the type wheel and the platen is usually extremely small, so when replacing the type wheel, the type wheel 2 is fixed to the output shaft 3a. It was extremely difficult to attach and detach the platen 1 because it had to be moved in the longitudinal direction and the platen 1 got in the way.

Incidentally, in FIG. 1, a chain line indicated by the symbol F indicates the outline of the apparatus that accommodates this printing mechanism.

Several structures have been proposed in which the type wheel 2 can be easily removed from such a structure. Figure 2 shows an example of this, in which the type wheel 2 is configured to be able to rotate together with the motor 3 about a fulcrum 4, and when removed, it is rotated from the position shown by the chain line in Figure 2 to the position shown by the solid line. The type wheel 2 is moved to a position far away from the platen 1, and the type wheel 2 is removed in this state.

However, although it is easier to remove, if the structure shown in Figure 2 is adopted, a large rotation space is required for the type wheel as shown by the hatching in the figure, and a large space is required inside the device, making the entire device difficult to use. It had the disadvantage of being larger.

Therefore, a structure as shown in FIG. 3 was proposed in an attempt to make the rotation space as small as possible. In the example shown in FIG. 3, since the fulcrum 5 is located above the structure shown in FIG. 2 and behind the motor 3, the type wheel 2 cannot be rotated to an open space outside the device. This is an attempt to make effective use of a large space.

However, if such a structure is adopted, there is a risk that the boss portion 2a of the type wheel 2, the spokes, the platen, or a dirt prevention plate (not shown) provided between the platen and the type wheel may come into contact with other parts. It had the disadvantage of causing problems in implementation, such as:

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional type, and is configured so that the type wheel can be guided into an open space without coming into contact with other parts, and the type wheel can be removed very easily. Its purpose is to provide a printing mechanism.

In order to achieve the above object, the present invention moves the type wheel parallel to the platen and moves it away from the platen, then rotates it to face the open space side of the device, and utilizes sufficient space to attach and detach the type wheel. We have adopted a structure that allows this to be carried out.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

4 and 5 explain the principle and embodiments of the present invention, and in each figure, the same parts as in FIGS. 1 to 3 are designated by the same reference numerals.

The embodiment described below is a printing mechanism in which a type wheel is attached to a carriage that moves horizontally along a platen, and a motor case in which a motor for rotating the type wheel is attached to the frame of the carriage together with the type wheel is rotatable. The motor case is rotatably supported, and the shaft is configured to be movable along an arcuate long hole formed in the carriage frame.

As is clear from the principle diagram in Fig. 4, the type wheel 2 is first moved in parallel in the direction away from the platen as shown by the chain line, and then the type wheel 2 is rotated toward the open space side together with the motor 3. We are hiring.

In FIG. 5, the reference numeral 6 is the frame of the carriage, and the frame 6 of this carriage is
is slidably fitted into two guide bars 7 and 8, and has a structure that allows it to move parallel to the platen 1. 6a and 6b indicate bearings. Inside this carriage frame 6 is a motor case 8.
is accommodated. The motor case 8 is formed as a substantially U-shaped frame, the motor 3 is integrally fixed thereto, and the type wheel 2 is attached to the outside of the tip. A shaft 9 is horizontally suspended at the rear end of the motor case 8. Both ends of this shaft 9 pass through long holes (arc-shaped) 6c formed on both sides of the carriage frame 6, and are exposed to the outside, and are each fixed to one end of a lever 10. The lower end of the lever 10 is rotatably connected to the carriage frame 6 via a shaft 11.

In addition, on both sides of the tip of the motor case 8,
A pin 8a is provided protruding from each, and this pin 8a
A is slidably fitted into a notch 6d which is bent into a substantially L-shape from the side edge of the upper end of the carriage frame 6 toward the type wheel 2 side.

Furthermore, two arcuate guide parts 8b and 8c are formed at the rear end of at least one side of the left and right side plates of the motor case 8, and a guide part 8b and 8c are formed inside the side plates of the carriage frame 6. 8b,
Pins 12 and 13 that engage with 8c are provided in a protruding manner. The one indicated by numeral 14 is the carriage frame 6.
This is a support shaft provided to pass through the lever from side to side, and both ends thereof serve as a shaft 11 that supports the lever 10 .

Next, the operation of this embodiment configured as above will be explained.

In normal use, the motor case 8 is in a substantially horizontal position, and the type wheel 2 is opposed to the printing paper P guided by the platen 1, as shown by the solid line in FIG. In this situation,
A pin 8a protruding from both sides of the tip of the motor case 8 is located at the tip of the notch 6b, and both ends of the shaft 9 are also located at the tip of the arc-shaped long hole 6c. In this state, normal printing operation is performed. When the type wheel 2 is to be removed and replaced, the lever 10 is rotated counterclockwise about the center shaft 11 in FIG. It is guided to the rear end of the hole 6c. As a result, motor case 8
As shown by the dashed line in FIG. 5, it retreats from the platen 1 in the horizontal direction, and at the same time draws a composite locus of upward rotation and stands up diagonally. At this time, the guide portions 8b and 8c formed at the rear ends of both side plates of the motor case 8 come into contact with the pins 12 and 13, respectively, and are guided by these and maintained in an obliquely standing state. . Therefore, type wheel 2
will be located on the open space side,
Changing the type wheel can be carried out very easily in a large space.

As is clear from the above description, according to the present invention, a structure is adopted in which the type wheel can be moved horizontally away from the platen and rotated toward the open space. No contact with parts occurs,
Type wheels can be replaced very easily.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a printing mechanism to which the mechanism of the present invention is applied, FIGS. 2 and 3 are schematic configuration diagrams illustrating the conventional structure, respectively, and FIG. 4 is an explanation showing the principle of the mechanism of the present invention. FIG. 5 is a perspective view showing an embodiment of the present invention. 1...platen, 2...type wheel, 3...motor, 6...carriage frame, 8...motor case, 9...shaft, 10...lever.

Claims (1)

[Scope of Claims] 1. A platen, a type wheel having type characters, a holder for holding the type wheel, and a holder for linearly guiding the holder away from the platen when the type wheel is removed. ,
A printing mechanism characterized by comprising: a guide means that allows rotation of the holding body thereafter. 2. The printing mechanism according to claim 1, wherein the guide means includes an arcuate long hole formed in the carriage frame and a notch formed by bending into a substantially L-shape.