JPS5854037B2 - printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printer that performs printing while swinging a print head bank in which a print head is arranged, and particularly relates to a printer that prevents vibration of a frame, etc. due to swinging of the print head bank. .

In general, dot-impact line printers operate by swinging a print mark bank, which has multiple print marks adjacent to the print paper, in a direction perpendicular to the direction in which the print paper is fed. At this point, a printing hammer is operated to make dots on the printing paper, and these dots form characters, etc., thereby printing.

Conventionally, this type of printer has been constructed as shown in the schematic diagram of FIG. 1 in order to prevent the frame of the printer from vibrating or generating noise due to the swinging of the print/printer bank.

That is, for printing, the print bank 1 and the balancer 2 are connected by a leaf spring 3, the balancer 2 and the frame 4 are connected by a leaf spring 5, and the printing is performed by a drive source (not shown) fixed to the frame 4. Print by applying driving force F to printer bank 1.
It was shaking Mass Bank 1.

In this case, the mass of the printing hammer bank 1 is Ml, the mass of the balancer 2 is M2, the spring constant of the leaf spring 3 is 0, the spring constant of the leaf spring 5 is 2, and the printing hammer bank 1 is a sine wave. If the driving frequency is f, then the conditions for completely absorbing the vibrations caused by the swinging of the print mark bank 1 are as follows:
The conditions for not transmitting vibration to the reframe 4 are as follows (
1) It becomes like the formula.

In addition, under this condition, print...ma bank 1 with amplitude A
The driving force F for driving is given by the following equation (2) (
However, Fo is inertial load, load other than splash load).

However, this conventional printer configuration requires a plate spring 5 between the balancer 2 and the frame 4, and not only is the configuration of the plate spring complicated, but the driving force F is as shown in equation (2). Load F due to friction etc.

The load (AK2M, si.

2□1□)2 It also had the disadvantage of becoming large.

The present invention does not connect the balancer and the frame with a leaf spring,
By connecting only the printing machine bank and the balancer with a plate, the above-mentioned drawbacks are eliminated, and a printer with a simple configuration and an extremely small printing machine bank driving force is provided.

According to the present invention, the present invention includes a frame, a paper mounting means attached to the frame and loaded with printing paper, and a print head bank that performs a swinging motion when printing on the printing paper with the disposed print head. A balancer connected to the print head bank by an elastic body when pressed on the printer, and a balancer attached to the frame to swing the print head bank or the balancer in the direction of the swing movement. and a driving means attached to the frame to swing the print head bank shifter or the balancer.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a perspective view of one embodiment of the present invention.

1 is a printing machine bank made of a plurality of leaf spring-shaped ferromagnetic materials. ), a plurality of coils 28 for driving the printing hammers 25 fitted to each of the comb teeth of the yoke 27, and a hammer bank frame 6 for attaching these. It is intricately structured.

The printing hammer bank 1 is mounted so that it can move a fixed distance left and right on two guide shirts (front and rear) 8.8' fixed to the frame 4.

Reference numeral 9 denotes a motor for swinging the printing hammer bank 1 left and right, which is fixed to the frame 4, and an eccentric cam 11 is fixed to its shaft 10.

Reference numeral 12 denotes a crank, the left end of which is rotatably fitted to the eccentric cam 11, and the right end rotatably attached to a shaft 13 fixed to the hammer bank frame 6.

2 is a balancer for absorbing the vibration caused by the swinging of the printing hammer bank 1, and it has two left and right plates 15 and 1.
5' and is hooked to printing machine bank 1.

Reference numeral 16 indicates printing... linkage connecting the frame bank 1 and balancer 2, both ends of the frame bank frame 6, t
= - It is rotatably attached to a shaft 17 that engages with the Yohi balancer 2 and is fixed to the frame 7.

18 is an ink ribbon, printing paper 19 and printing hammer 25
located between.

A platen 20 functions to feed the printing paper 19 and at the same time receives impact force during printing.

A belt 21 is placed between a motor pulley 23 fixed to the rotating shaft of a paper feed motor 22 and a platen pulley 24 fixed to the platen 20, and transmits the driving force of the motor 22 to the platen 20.

When the motor 9 rotates, the printing press bank 1 performs a nearly strictly sinusoidal movement left and right on the axis of the front and rear guide shafts 8.8' by the eccentric cam 11 and the crank 12.

FIG. 3 is a dynamic model of the embodiment shown in FIG. If the amount, that is, the amplitude of the printing noma bank is A, then X1=Asin2πft.

If the plate spring constant 15.15' is set to 1 and the spring constant is K, the driving force FD1 applied by the motor 9 to the printing hammer bank 1, and the force FR acting on the frame 4 are expressed by the following equation (3), respectively: It is shown by equation (4).

If you select M12M2 button and K so that FD-F
o・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・(6
) FR Knee Fo・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
...-(7), and the driving force FD only needs to compensate for losses due to friction, viscosity, etc., and only needs to be an extremely small force.
Also, the frame 4 is -F due to the reaction of the driving force.

It does not vibrate just by receiving the force of.

In fact, these forces are almost unrelated to the swing frequency f, so even if the swing frequency f is made high, the driving force F.

In addition, the force FR acting on the frame 4 remains unchanged.

, and when passing through this resonance point during starting and stopping,
To avoid the risk of abnormal vibration, print hammer bank 1
Since the link 16 connecting the balancer 2 and the balancer 2 is provided, this abnormal vibration is prevented.

The link 16 is not necessarily required when swinging in steady operation.

A printing operation and a paper feeding operation are performed during the swinging operation, and predetermined characters, symbols, and figures are printed on the printing paper 19.

In addition, the printing hammer bank 1 is connected to the guide shaft 8.8.
Although the embodiment has been described in which the balancer 2 is guided by the motor 9 instead of the printing hammer bank 1, the printing hammer bank 1 is guided by the leaf springs 15 and 15'. It is also possible for the balancer 2 to be oscillated and instead of the printing hammer bank 1 to be guided by a guide shaft.

As explained above, the present invention does not connect the balancer and the frame with an elastic body, but only connects the printing hammer bank and the balancer with an elastic body, so that the mass buttons of the printing hammer bank and the balancer can be When the printing hammer bank is oscillated at a predetermined frequency determined from the bounce constant of the body, it is possible to prevent the frame etc. from vibrating due to the oscillation of the printing hammer bank, and to oscillate the printing hammer bank. The driving force required to move the elastic body is extremely small, which has the effect of simplifying the construction of a small elastic body.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the mechanical relationship of a conventional example;
The figure is a perspective view of one embodiment of the present invention, and FIG. 3 is a schematic diagram showing the dynamic relationship of the embodiment shown in FIG. 2. 1...Printing head bank, 2...Balancer, 3゜5.15,15'...Plate spring, 4...
...Frame, 6...Hammer bank frame, 8.8'...Kite shaft, 9,2
2...Motor, 11...Eccentric cam, 1
2...Crank, 16...Link, 1
9...Print paper, 20...Platen,
25... Printing hammer.

Claims (1)

[Claims] 1. For a printer having a frame, a paper mounting means attached to the frame and loaded with printing paper, and a print head bank that performs a swinging motion when printing on the printing paper with the disposed print head, The print head
a balancer connected to the bank by an elastic body; a guide means attached to the frame for swingably guiding the printhead bank or the balancer in the direction of the swinging movement; and drive means for swinging the print head bank or the balancer.