JPS5889378A - Dot impact type line printer - Google Patents

Abstract

PURPOSE:To obtain a dot impact type line printer of light weight and small drive force by a method in which a printing hammer bank is divided into plural sections and one section is used as a balancer. CONSTITUTION:Printing hammer banks 1 and 2 are provided such that they can move by a given distance in the lateral direction on two front and rear guide shafts 9 fixed to a frame 8. Compression springs 15 and 15' have an adequate spring constant suitable for absorbing the vibration of the printing hammer banks 1 and 2. As a motor 10 turns, the printing hammer bank 1 makes a sine movement in the right and left directions on the guide shafts 9 and 9' by means of an eccentric cam 12 and a crank 13. Drive force F is only one enough to compensate for losses resulting from friction and viscosity, and also the frame receives only the force of -F as the reaction of the drive force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dot impact line printer used for printing information.

As a method for absorbing the vibration of printing hammer punctures in a dot impact type line printer that prints from the front by swinging the printing hammer punctures left and right, in which a plurality of printing hammers are arranged adjacent to and across the printing paper. ,
There is a method of connecting a printing hammer puncture and a palancer using an elastic body.

Figure 1 is a dynamic model of the vibration absorption mechanism, where the mass of the printing hammer puncture is Ml, the mass of the parenser is Mm,
Printing/~The spring constant of the elastic body between the frame and the parenser is 1.
When the print hand bank is moved away from the engineering string wave, the frequency of the turtle becomes f.
Then, the conditions for transmitting vibration to the 7th frame as much as possible are as shown in the following equation (1).

It is known that the driving force for driving the printing hammer puncture in this case only needs to compensate for losses due to friction and viscous forces, and the frame receives this reaction force, which is almost independent of the driving frequency. ing. As described above, the use of a parancer is an indispensable condition, but there is a drawback that the weight of the device becomes heavy.

The present invention divides the printing hammer puncture into a plurality of parts and uses one of them as a paralleler, thereby reducing the weight, having a simple configuration, and having an extremely small printing hammer puncture driving force, which is suitable for high-speed printing. Provides impact type line printers.

The dot impact type twin printer according to the present invention includes a plurality of printing hammers, for example, two printing hammers arranged adjacent to and across the printing paper, and a plurality of printing hammer punctures, for example, two printing hammers, which are attached to a frame and arranged in a direction transverse to the printing paper. It is constituted by a drive mechanism that swings one printing hammer i-puncture left and right, and an elastic body that swings the driven printing hammer puncture and the non-driven printing hammer puncture left and right in opposite phases.

Next, one embodiment of the present invention will be described in detail with reference to nine drawings.

Referring to FIG. 2, in one embodiment of the present invention, the printing hand i-bank is divided into two parts, which are connected by an elastic body and are oscillated left and right in opposite phases.

Printing hammer punches 1 and 2 each have a plurality of leaf spring-like printing hammers 3 made of ferromagnetic material, and a comb-shaped ring 5 glued with a permanent magnet 4 sandwiched between the upper and lower sides, and the teeth of each comb. It is mainly composed of a plurality of coils 6 fitted together. The printing hammer punctures 1 and 2 are mounted so as to be movable a fixed distance in the left-right direction on guide shafts 9 on two front shoulders fixed to a frame 8.

Motor 1 for swinging the printing hammer puncture 1 from side to side
0 is fixed to a frame 8, and an eccentric cam 12 is fixed to its shaft 7)11. The left end of the crank 13 is rotatably fitted to the eccentric cam 11, and the right end is rotatably attached to a shaft 14, which is identified by the printing hammer puncture l.

The compression springs 15 and 15' are connected to the printing hammer punctures 1 and 2.
It has an appropriate spring constant to absorb vibrations.

The links 16 and 16' connecting the printing hammer punctures 1 and 2 are rotatably mounted on shafts 17 and 17' fixed to the printing hammer punctures 1 and 2.
It is swung and fixed to the frame 8. The bracket 18 is rotatably attached to a shaft 19 that can move up and down through the elongated hole.

The ink ribbon 20 is located between the printing paper 21, 22 and the printing handle v30. The platen 23 receives impact force during printing. Tractor 24.24″, 25 and 25″
is driven by a paper feed motor (not shown) and performs the function of feeding printing paper.

Figure 3 shows a dynamic model of the printing hammer puncture 1 and its swing mechanism.
II, the printing hammer puncture 2 has a pair of compression springs 1 on the front shoulders.
5 and 15' (the constants are both '') to the print handle 1.

The operation of an embodiment of the present invention will be explained below with reference to FIGS. 2 and 3. Printing hammer punk 1 is 毫-Yu 1
0 rotates, the eccentric cam 12 (eccentricity) and the crank 13 cause a sinusoidal movement to the left and right on the axes of the front shoulder guide shirt) 9 and 9'. If the displacement of the printing hand bank 1 is xl, the rotational speed of the motor 10 is f1, and the amplitude is x1, then x1=Adn2πf, and the load other than the inertial load and spring load is F. Then, the driving force F, The force Pl acting on the 7 frames is shown by the following 0) and (4) 2, respectively.

*2 wf t+Fo ・Old...
...(3)r1■-F ...Town...
(4) If we select M; M; and ′ in such a way that F! F.

Fl M−p@, and the driving force F only compensates for the loss due to friction and viscosity.
It only receives the force of F. When the system stops, abnormal vibrations occur when passing through this point, but this can be prevented because links 16 and 16' are provided to connect the printing hammer punctures 1 and 2. During the swinging operation, the printing operation and paper feeding operation are performed by almost the same means as in the case of Japanese Patent Application No. 54-86239 and Figure Mule, and predetermined characters are printed on the printing sheets 21 and 22. Symbols and shapes are printed.

As explained above, by appropriately selecting the masses of the print handle banks 1 and 2 and the spring constants of the compression springs 15 and 15', a high-speed dot-impact line printer with a low weight and simple configuration can be used. can be provided.

Note that in the embodiment described above, the printing handle! Punk 1
Although the printing/letter hammer punk 2 is driven in this embodiment, the same effect can be obtained by driving the printing/character hammer punch 2.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the operation of a conventional dot impact type line printer, Fig. 2 is a perspective view of the mechanism of an embodiment of the present invention, and Fig. 3 is an explanation of the operation of the embodiment shown in Fig. 2. This is a diagram. ':tl=Alia 27Lf, tX2 start 1 Figure 3

Claims (1)

[Claims] In a printer that prints by moving a printing hammer puncture from side to side, in which a plurality of printing hammers are arranged adjacent to and across the printing paper, the printing hammer! A dot impact type line printer characterized by dividing a moving body including a plurality of parts into a plurality of parts and connecting each part with an elastic body.