JPS5835157B2 - injisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and more particularly to a printer drive mechanism.

An object of the present invention is to provide a first cam part and a second cam part to make the irregularly shaped hole formed in the hammer into a substantially triangular shape. The apexes of the first cam part and the second cam part, that is, the groove parts engage with the second guide member by linear movement, and when the hammer returns, the second cam part positions the hammer outside the rotational trajectory of the rotary drive member. The aim is to achieve high print quality, reduce malfunctions, and reduce the number of parts.

The present invention will be explained in detail using FIGS. 1 to 5.

1. FIG. 1 shows a standby state in which the hammer 10 does not operate at all.

Type letters 21 are provided on the circumference of the type ring 20, and the type letters 21
A printing paper 30 is inserted between the hammer 10 and the hammer 10.

The head 11 of the hammer 10 is provided with an elongated hole 12 into which a first guide member 40 is fitted, and the tail portion 13 of the hammer 10 is provided with an irregularly shaped hole 14 into which a second guide member 50 is fitted.
is fitted.

The irregularly shaped hole 14 is composed of a first cam part 15, a second cam part 16, and a groove part 17, and has a substantially triangular shape.

A spring 60 is applied to the hammer 10, and a rotational force to rotate the hammer 10 counterclockwise around the first guide member 40 and a force to move the type wheel 2075 away from the hammer 10 are applied.

Electromagnetic device 70 converts an external electrical signal into a mechanical signal.

The engaging member 71 is rotatable about a shaft 72, and has one end engaged with the hammer 10 and the other end engaged with a suction plate 73.

A coil 75 is wound around the iron core 74. The rotary drive member 80 rotates synchronously with the type wheel 20.

In the standby state shown in the first figure, the hammer 10 is
Since a counterclockwise rotational force is applied by 0,
The engagement portion 18 of the hammer 10 is outside the rotation locus of the rotation 1 drive member 80.

When the coil 75 is energized just before the type 21 to be printed comes to a position facing the hammer 10, the state shown in FIG. 2 is achieved.

That is, the suction plate 73 is attracted toward the iron core 74, and the engagement member 71 rotates counterclockwise about the shaft 72.

The engaging member 71 rotates the hammer 10 in a clockwise direction against the spring 60, and causes the engaging portion 18 of the hammer 10 to enter the rotation locus of the rotary drive member 800.

Immediately before the hammer 10 is driven in the direction of the type 21 by the rotary drive member 80, the current to the coil 75 is cut off, but the generated magnetic energy does not disappear immediately, so the attraction plate 73 attracts the iron core 74. maintain the condition.

FIG. 3 shows the process in which the hammer 10 flies in the direction of the type 21.

As the hammer 10 flies in the direction of the type 21, the first cam portion 15 slides along the second guide member 50, so that the hammer 10 rotates counterclockwise around the first guide member 40. Fly in the direction of type 21.

At this time, since the engaging member 71 is rotated clockwise by the hammer 10, a gap is created between the suction plate 73 and the iron core 74, and the remaining magnetic energy is absorbed by the suction plate 73.
It is not possible to generate a force that pulls the iron in the direction of the iron core 74.

FIG. 4 shows the state immediately before the hammer 10 presses the printing paper 30 against the type 21.

At this time, since the second guide member 50 is inserted into the groove 17 of the hammer 10, the hammer 10 loses the degree of freedom of rotation around the first guide member 40 and only moves linearly in the direction of the type 21. , to accurately print type 21 on printing paper 30.

FIG. 5 shows the state in which the hammer 10 has finished printing and returned to the standby position.

As shown in FIG. 3, the engaging member 71 has already lost its force to rotate the hammer 10 clockwise against the spring 60.

Therefore, the hammer 10 is rotated counterclockwise about the first guide member 40 by the spring 60 and moves away from the type 21.

At this time, the second cam portion 16 of the hammer 10 returns to the standby state shown in the first diagram while sliding along the second guide member 50 under the action of the spring 60, so that the engaging portion 16 of the hammer 10
does not enter the rotation locus of the rotary drive member 800 again.

As described in detail, the hammer 10 is configured such that the second guide member 50 enters the groove 17 provided in the hammer 10 before printing.
Since rotational movement about the first guide member 40 is restricted, the hammer 10 then performs a simple linear movement.

Therefore, when the type 10 is printed on the printing paper 30, a clear print can be obtained.

Also, after printing, the engaging portion 18 of the printer 10 returns to the standby state without entering the rotation locus of the rotational drive member 80.
There is no malfunction caused by the rotary drive member 80 again.

As explained above, according to the present invention, it is possible to provide an inexpensive printing device with a small number of parts and stable operation.

[Brief explanation of the drawing]

1 to 5 are side views showing a series of operations of a specific example of the printing device according to the present invention, in which 10 is a hammer, 20 is a type wheel, 30 is printing paper, 40 is a first guide member, 50 60 is a spring, 70 is an electromagnetic device, and 80 is a rotational drive member.

Claims (1)

[Claims] 1. A hammer is movably held by first and second guide members,
The electromagnet operates the engaging member to move the hammer, which engages with the engaging member, into a rotation locus of a rotary drive member, and the rotary drive member causes the hammer to fly toward the type wheel. The hammer has a long hole held by the first guide member;
It has a substantially triangular shaped hole having a first cam part and a second cam part which are held by the second guide member, and when the hammer is flown by the rotary drive member, the first cam slides on the second guide member to move the hammer linearly, and when the hammer returns to the standby position, the second cam part slides on the second guide member to move the hammer in the linear motion. Printing device 6 structured to be positioned outside the rotation locus of the rotational drive member