JPS6058710B2 - printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and more particularly to a printing device that can be small, lightweight, and inexpensive.

In other words, we omitted the conventional control flancher of the paper feed clutch, and replaced it with a hammer with the same structure as the printing hammer, which performed the function of the flancher, reducing manufacturing, assembly, and maintenance. This makes inspection, etc. extremely easy. 1 is a diagram showing a conventional example of a shift mechanism for the intermediate hammer group 20, and 12 is a diagram showing a conventional example of a shift mechanism for the intermediate hammer group 20.
14 is a flancier for a paper feed trigger, 15 is a spring clutch that transmits the rotation of the gear 15c to the shaft 15d, and 16 is a positioning lever for the holder 12. When the power of the printer is turned on, a motor (not shown) for rotating the type drum 3 starts to rotate, and its rotational force is transmitted to the gear 15c, which starts its idle rotation. Next, the coil 14a of the flancier 14 for paper feed trigger is energized, and the claw 14c of the armature 14b is activated.
The engagement of the pawl 15b of the pawl wheel 15a of the spring clutch 15 is released, and the pawl 15b' of the pawl wheel 15a moves to the armature 1.
4b engages with the claw 14c and rotates at a constant angle. Claw wheel 1
Due to the constant angle rotation of gear 5a, the rotation of gear 15c is caused by rotation of axis 15d.
a rubber roller 15e fixed to a shaft 15d,
Paper 4 is fed by 15f.

Also, the armature 14b has a claw 14d, and when feeding the paper, pushes one end 16b of the positioning lever 16 to release the shaft 13.
Rotate the lever J16 counterclockwise around , and release the claw 16a of the lever 16 from the end surface 112b of the holder 12.

Then, the holder 12 is shifted in the direction of arrow A by the spring 8 to a position where its end surface 12c contacts the claw 16a, and the printing starts. The main hammer group 9 and the intermediate hammer group 20 are selectively energized by the print signal to print even-numbered digits.

Next, the holder shifting plunger 7 is energized and sucks the armature 7a engaged with the holder 12, thereby shifting the holder 12 in the direction of arrow B.

Since the positioning lever 16a is given clockwise torque around the shaft 13 by the spring 13a, the holder 12
When the is shifted, it is inserted into the end surface 12b and the end surface 12b
to hold the holder 12 still. After this, odd-numbered digits are printed according to the print signal. When printing is completed, the vapor feed coil 14a is energized again, vapor feeding is performed as described above, and the positioning lever 16 is activated.
The claw 16a is removed from the end surface 12b, and the spring 8 shifts the holder 12 in the direction A and returns it to its initial state.

Each hammer of the main hammer group 9 is provided with a solenoid 9c including, for example, an iron core and a coil in the head and supported by springs 9a and 9b.The iron core is attracted by a permanent magnet 70, and the springs 9a and 9b
Let mechanical power be accumulated in .

In this state, when the solenoid 9c is energized via the springs 9a and 9b, the head is released and the intermediate hammer 20 is struck, causing it to fly. This hammer structure is, for example,
-132819 etc.

2 and 3 are views showing one embodiment of the present invention, in which 1 is an ink roller, 2 is an intermediate hammer holder, 100 and 101 are hammers according to the present invention, and 10 and 11 are levers pressed by them. be.

FIG. 3 shows an initial state where printing is started, in which the intermediate hammer holder 2 is receiving a force in the direction of arrow B by the spring 2e, and the end surface 2b is held down by the tip 10a of the lever 10.

The main hammers 91 to 99 are selectively energized by the print signal, and characters are selected on the type wheels 31 to 50 via the intermediate hammer group 20 to print on the printing paper 4.

Next, when the hammer 100 is energized, it pushes the lever 10, and the lever 10 starts to rotate counterclockwise around the shaft 60, and the tip 10a of the lever 10 comes off the end surface 2b of the holder 2, and the intermediate hammer holder 2 is shifted by a spring 2e until its end surface 2c touches the tip 10a of the lever 10.

In response to the print signal again, the main hammers 91 and 99 urge the intermediate hammer group 20 to press the type ring to perform printing. Next, when the hammer 101 is energized by the paper feed signal, it presses the lever 11, and the pawl 11a of the lever 11 is pressed against the spring clutch 6.
a is released from the claw 6e. The spring clutch transmits the rotation of the shaft 6d to the gears 6a and 6c, and rotates until the next pawl contacts the pawl 11a of the lever 11 again.

Since the gear 6c is engaged with the gear 7a, the paper is fed by the rubber roller 7b through the shaft 7c.

At the same time, the gear 6b also engages with the gear 5b, and transmits rotation to the cam 5a, which is integrated with the gear 5b. Therefore, the cam 5a
shifts the end surface 2a of the intermediate hammer holder 2, and shifts the intermediate hammer holder 2 in the direction of arrow A. Since the lever 10 receives a clockwise force from the spring 10b, when the end surface 2b passes over the lever 10, it enters the groove. When the cam rotates once, the cam surface becomes lower and is separated from the end surface 2a, so that the intermediate hammer holder 2 receives a force in the direction of arrow B by the spring 2e, but the end surface 2b is held down by the lever 10 and remains stationary. The above process returns to the initial state. As described above, the present invention uses a hammer having the same structure as the printing hammer as the control means for the paper feed clutch, so the structure is extremely simple and mass production is possible at low cost.

Furthermore, since the driving force for feeding the paper is diverted from the driving member for rotating the type wheel, the structure can be made even simpler. In addition, the printing paper stain prevention member is formed by blocking every other digit as shown in 2d in Fig. 2, and is shifted integrally with the holder 2, so that the folding angle of the paper 4 is reduced and the hammer drive This is preferable because sufficient printing is possible even with a small force.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional printing device, FIG. 2 is a plan view of an embodiment of the present invention, and FIG. 3 is a perspective view thereof. 2...Intermediate hammer holder, 10, 11...
Lever, 91-101...Hammer.

Claims (1)

[Claims] 1. A type wheel with type arranged on its circumferential surface, a first hammer placed opposite to the type wheel and configured to print on paper by hitting the type, and a drive source for rotating the type wheel. a paper feeding member that feeds the paper to the type wheel; and a clutch that is disposed between the drive source and the paper feeding member and selectively transmits power from the driving source to the paper feeding member to feed the paper. and a second hammer having the same configuration as the first hammer and disposed at a position where the clutch can be actuated to selectively actuate the clutch to feed the paper by a predetermined amount. Characteristic printing device.