JPS62930Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printing device that uses a disc-shaped type wheel in the printing section and performs impact printing using a hammer or the like.

BACKGROUND ART Conventionally, printing devices have been put into practical use that print by applying an impact with a hammer or the like to a disc-shaped type wheel having type characters at the tips of elastic arms extending around the outer periphery in the shape of petals. However, when using these printing devices on typewriters etc., the number of types of printed characters is 80 or more.
The outer diameter of the type wheel becomes larger, the printing device becomes thicker, and the inertia of the type wheel increases, which limits the printing speed. or,
There is a way to reduce the diameter of the type wheel by providing two types on each petal, but since there are two types on the same petal, the selection requires moving the type wheel perpendicular to the direction of rotation. Therefore, the structure becomes complicated, and it is difficult to make the printing device thinner.

The present invention aims to eliminate these drawbacks, and will be described below with reference to the drawings, which are one embodiment.

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention.
FIG. 2 is a plan view of a type wheel according to an embodiment of the present invention. 1 is a first type wheel, 2 is a second type wheel, 3 is a type wheel positioning ring, 4 is a motor, 5 is a hammer, 6 is a plunger, 7 is a clutch lever, 8 is a first type wheel rotation transmission plate, 9 is a second type wheel rotation transmission plate, 10 is a rubber ring, 11 is a platen, and 12 is an ink ribbon. 1a is a type part provided at the tip of the petal part of the type wheel 1, and 1b is a petal with the type part cut out. When a printing command is received, the plunger 6 is positioned depending on the presence or absence of a shift command, and the clutch lever 7 working together with the plunger 6 causes the first character wheel rotation transmission plate 8 to be transferred to the first type wheel 1 or the second type wheel 2.
Alternatively, the second type wheel rotation transmission plate 9 is pressed into contact with the rubber ring 10. Next, when the motor 4 is rotated by a required amount, the rotation is transmitted to the type wheel via the rotation transmission plate, and the desired type is selected. Next, the hammer 5 is activated to impulsively print characters onto the paper on the platen 11 via the ink ribbon 12. The type wheel positioning ring 3 is
The motor shaft is positioned in the axial direction, and each type wheel is axially positioned and rotatably supported by a type wheel positioning ring 3. Further, the motor shaft and the rotation transmission plates 9 and 10 are rotatably transmitted by a key and are supported so as to be slidable in the axial direction. As shown in 1b of FIG. 2, the type wheel 1 has one or more notches in the type part of the petal, and when printing the type on the second type wheel 2, the type wheel 1 cuts out the type notch on the path of the hammer 5. 1b
position so that it does not interfere with printing.
Similarly, when impacting the type of the first type wheel, the type notch of the second type wheel is placed on the hammer path. In FIG. 1, the motor 4 and plunger 6 can be made thinner by arranging them so that they are offset in a plane so that they do not overlap in the thickness direction.

In the present invention, by using a plurality of type wheels as described above, each type wheel can be miniaturized, and the printing device can therefore be made thinner, and the inertia of the type wheel is reduced, making high-speed printing possible.

Furthermore, since the type wheel is selected by a clutch that moves in the axial direction of the motor, a compact and simple structure can be obtained.

[Brief explanation of the drawing]

FIG. 1: A partial sectional view showing an embodiment of the present invention; FIG. 2: A plan view of a type wheel according to an embodiment of the present invention. 1... First type wheel, 2... Second type wheel, 3... Type wheel positioning ring,
4... Motor, 5... Hammer, 6... Plunger, 8, 9... Type wheel rotation transmission plate, 1
0...Rubber ring.

Claims (1)

[Scope of utility model registration request] A petal-shaped first type wheel 1 and a second type wheel 2 are loosely fitted and juxtaposed on a motor shaft rotated by a motor; a hammer 5 for striking the type of each of the type wheels against the platen 11; Two rotation transmission plates 8 and 9 are arranged to sandwich the type wheel and the second type wheel, and rotate together with the motor shaft and can slide in the axial direction; a rubber ring 10 fixed to the plate; a clutch lever connected to the rotation transmission plate for moving the rotation transmission plate, bringing the rubber ring into contact with a desired one type wheel, and rotating the one type wheel; 7. The plunger 6 is connected to the clutch lever and moves the clutch lever, and each of the type wheels has a notch formed by cutting out the type part at one place, and the notch of the type wheel in the non-selected state 1. A printing device, characterized in that a part of the printer is brought onto the path of the hammer.