KR20000012022A - Print device - Google Patents

Abstract

PURPOSE: A printing device is provided to adhere a buffering material to the hitting surface of an elastic body for reducing the impact of the crash and the number of a multiple crash. CONSTITUTION: A printing device contains a flexible buffering material(62) being stored in a firm buffering material(61) in case of a maximum approach of a linearly moving shaft supporters(12b), (12c) and an elastic body(40). The repulsive power of the elastic body is lessened by the compression of the flexible buffering material in case of crash, so the moving speed and moving amount toward the opposite side is reduced. Therefore, the impact after the second crash is repressed for reducing the number of the crash, and the noise generated while crashing is reduced by the firm buffering material receiving the power in case of the maximum approach of the crashing surfaces.

Description

Printing device {PRINT DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device which performs printing in the course of a shuttle operation of a hammer bank, and in particular, inverts the hammer bank and the hammer bank in the vicinity of both ends of an amplitude of a reciprocating motion of a counter balancer moving out of phase with the hammer bank. It relates to a printing device to be pressurized.

A printing device employing a linear motor shuttle mechanism is known for carrying out a shuttle operation of a hammer bank. 1 shows a configuration of a conventional linear motor shuttle mechanism.

In the hammer bank 10, a plurality of dot printing hammers (not shown) are arranged in the width (digit) direction of a recording medium (not shown). The hammer bank 10 is supported by the linear motion bearings 12a and 12b to reciprocate on the guide shaft 11. The linear motor 20 is used as a driving source for reciprocating the hammer bank 10. This linear motor 20 is supported by the linear drive shaft 12c, and drives the guide shaft 11 on the guide shaft 11 out of phase with the hammer bank 10 by the inversion mechanism part 30 mentioned later. The linear motor 20 is made of a magnet in which the coil 21, the S pole and the N pole are alternately arranged, and is configured to be movable with respect to the magnet in which the coil 1 is fixedly arranged.

The above-mentioned inversion mechanism part 30 is comprised by the pair of timing pulleys 32 arrange | positioned by predetermined distance, and the timing belt 31 interposed between these timing pulleys 32, and the hammer bank 10 and The coil 21 is connected to the upper side and the lower side of the timing belt 31, respectively. When the linear motor 20 is driven to move the coil 21 to the left and right, the lower side of the timing belt 31 to which the coil 21 is fixed moves in the same direction, and accordingly the timing at which the hammer bank 10 is fixed. The upper side of the belt 37 moves in a direction opposite to the moving direction of the coil 21. That is, the power of the linear motor 20 is transmitted to the hammer bank 10 through the inversion mechanism unit 30, and the hammer bank 10 is configured to perform a shuttle operation. At this time, the hammer bank 10 and the coil 21 are moved in the opposite direction to each other so that the coil 21 also functions as a counterbalance of the hammer bank 10. Therefore, the masses of the coil 21 and the hammer bank 10 are designed to be substantially the same. Next, when the description focusing on the function as the counter balancer of the coil 21, the coil 21 is called the counter balancer 21. As shown in FIG.

When the hammer bank 10 moves in the right direction, the counter balancer 21 moves in the left direction, and the hammer bank 10 reaches the right inverted position, with the linear bearing 12a of the hammer bank 10. The linear drive shaft 12c of the counter balancer 21 is configured to collide with each other. Similarly, when the hammer bank 10 moves to the left direction, the counter balancer 21 moves to the right direction, and the hammer bank 10 moves directly to the left inverted position, and the linear bearing 12b of the hammer bank 10 is moved. ) And the linear drive shaft 12c of the counter balancer 21 are configured to collide with each other. In practice, in order to avoid a collision between the linear motion bearings 12a and 12b of the hammer bank 10 and the linear motion bearings 12c of the counter balancer 21, an elastic body is interposed between the collision surfaces as described later. It does not collide by the motor control.

In the conventional configuration shown in Fig. 1, the elastic body 40 as the reverse pressurizing means is disposed between the collision surface on the hammer bank 10 side and the collision surface on the counter balancer 21 side, and the hammer bank 10 is positive. When it comes to the vicinity of an inversion position, it collides with each collision surface and the elastic body 40, it presses in the elastic body 40, and it is set as the structure which reverses by the repulsive force.

Here, the elastic body 40 may be fixed to the hammer bank 10 side or the counter balancer 21 side, or may be disposed at any position between the collision surfaces without being fixed. 1 shows an example in which the elastic body 40 is fixed to the counter balancer 21 side linear bearing 12c.

FIG. 2 is an enlarged view in the ring frame of FIG. 1. As shown in FIG. 2, since the elastic body 40 fixed to the linear drive shaft 12c on the counter balancer 21 side and the linear drive shaft 12b on the hammer bank 10 side approach each other at a speed v, they collide with each other. The relative velocity of the collision is 2 v, which is the factor that increases the sound at the time of collision.

In order to reduce the sound at the time of a collision, the shock absorbing material 60 was attached to the collision surface like FIG. Although it is preferable that this buffer material 60 consists of a flexible material, it is not too flexible and some hardness or more is required. However, in the case where the elastic body 40 is not fixed at an arbitrary position between the collision surface on the hammer bank 10 side and the collision surface on the counter balancer 21 side, there are the following problems.

The elastic body 40 is not in the center position between the linear drive shaft 12b on the hammer bank 10 side and the linear drive shaft 12c on the counter balancer 21 side, and the linear drive shaft 12b on the hammer bank 10 side. When the position is closer than the side of the, the linear drive shaft 12b on the hammer bank 10 side collides first, and then the linear drive shaft 12c on the counter balancer side collides. Hereinafter, the first collision will be referred to as primary collision, and the subsequent collision will be referred to as secondary collision. If the above-mentioned shock absorbing material 60 does not absorb the impact of the primary collision of the linear motion bearing 12b of the hammer bank 10 side, the elastic body 40 will repulse by the force of a collision, and the linear movement of the counter balancer 21 side will be carried out. It moves to the bearing 12c side. Secondary collision occurs immediately, and the elastic body 40 repulses similarly here, and moves to the hammer bank side linear bearing 12b side again. Thereafter, similarly, the third linear collision and the fourth collision are sequentially repeated until the direct drive shafts on both sides approach and contact the elastic body 40.

As described above, in the case where the elastic body 40 is not fixed at any position on the guide shaft 11, multiple collisions occur and there is a problem that sound is generated for each collision. In addition, the sound absorbing material is required in the printing device so that the impact sound does not go out of the printing device, which has been a factor of the cost increase.

The present invention has been made to improve the problems of the prior art, and its object is to reduce the sound generated due to collision with an elastic body in a shuttle mechanism having an elastic body as a reverse pressure mechanism.

Another object of the present invention is to reduce the sound generated by multiple collisions in the case of a configuration in which the elastic body is not fixed at any position between positive impact surfaces in which the elastic body reciprocates in the reverse phase. .

1 is a schematic front view showing the configuration of a shuttle mechanism part of the prior art.

2 is a conceptual diagram showing a collision operation of the prior art.

3 is a sectional view of the vicinity of an elastic body showing an example of the prior art;

4 is a configuration diagram near the elastic body of the present invention.

5 is a conceptual diagram showing a collision operation according to the present invention.

6 is a cross-sectional view of the vicinity of an elastic body showing an example of the present invention.

8 is a sectional view of the vicinity of an elastic body showing another example of the present invention.

9 is a sectional view of the vicinity of an elastic body showing another example of the present invention.

10 is a sectional view of the vicinity of an elastic body showing another example of the present invention.

In order to achieve the above object, the present invention has a hammer bank having a plurality of dot factor hammer, and a shuttle mechanism for reciprocating the hammer bank in the transverse direction, the dot factor hammer in the process of reciprocating movement of the hammer bank And a counter balancer which performs printing by driving and also has a counter balancer which reciprocates in the reverse phase of the reciprocating movement of the hammer bank, and also applies reverse pressure to the opposite ends of amplitudes of the reciprocating movement of the hammer bank or counter balancer. In the printing device arranged in this arrangement, the reverse pressurizing means is disposed at approximately an intermediate position between the collision surfaces of the hammer bank side and the counter balancer side.

The hammer bank, the counter balancer and the reverse pressurizing means are connected to a guide shaft for reciprocating movement, and the reverse pressurizing means may be provided with a supporting material for supporting the guide shaft.

In addition, the present invention has a hammer bank having a plurality of dot factor hammers, and a shuttle mechanism for reciprocating the hammer banks in a lateral direction, and driving the dot factor hammers during the reciprocating movement of the hammer banks to obtain a factor. And a counter balancer which reciprocates in reverse phase with the reciprocating movement of the hammer bank, and an inversion pressurizing means for imparting reverse pressure to both ends of an amplitude of the reciprocating movement of the hammer bank or counter balancer. In the apparatus, each impact surface of the hammer bank side or the counter balancer side of the inverting and pressing means includes a flexible cushioning material that absorbs the impact immediately after the impact of the hammer bank or counter balancer, and a rigid that can withstand the subsequent inversion operation. It is set as the two-layer structure of a buffer material. With such a configuration, the impact surface of the elastic body serving as the reverse pressure means can be changed in elasticity so as to be weakly and then steel immediately after the collision, and the impact of the collision and the number of multiple collisions can be reduced.

By reducing the sound in this way, the level of sound generated from the printing device can be lowered, the cost of the soundproofing material and the number of mounting steps can be reduced, and the printing device itself can be supplied at low cost.

Next, the structure of the shuttle mechanism part which concerns on this invention is demonstrated in detail. Since the basic configuration is the same as in the prior art, it will be omitted, and only the configuration of the elastic body portion, which is a reverse pressure means, which is a feature of the present invention will be described. In addition, an example in which the hammer bank side collision surface and the counter balancer side collision surface are used as one surface of the linear drive shaft is shown.

4 is a configuration diagram of an elastic body showing an example of the present invention.

The elastic body 40, which is the reverse pressure means, is disposed at a substantially center position of the linear drive shaft 12b on the hammer bank 10 side on the guide shaft 11 and the linear drive shaft 12c on the counter balancer 21 side. By fixing approximately the center of the elastic body 40 with the guide 41, when the hammer bank 10 is directed to the left inverted position, the hammer bank side linear bearing 12b collides with the relative speed v from the right side of the elastic body 40. Then, the counter balancer side linear bearing 12c collides with the relative speed v from the left side of the elastic body 40. The same is true when the hammer bank is headed for the right hand position.

Next, the energy at the time of collision is considered using FIG.

If the elastic body 40 is the Joule reference, the total mass on the hammer bank 10 side is equal to m, the total mass on the counter balancer 21 side is equal to m and the relative velocity of the collision is v. The energy Esh at the collision on the 10) side is (1/2) mv ² , and the energy Esh at the collision on the counter balancer 21 side is also (1/2) mv ² , and all the energy at the collision according to the present invention. E1 is represented by the following equation.

E1 = Esh + Esc = 1/2 mv ² + 1/2 mv ² = mv ²

This energy is dispersed by the collision force to insert heat, sound, elastic bodies, and the like. At this time, the rate at which all the energy is dispersed by each factor is the same, and it is constant. That is, the negative energy Es1 at the time of collision according to the present invention is expressed by the following equation.

[Equation 1]

Es1 = Ks × E1 = Ks mv ²

On the other hand, the energy at the time of a collision by a prior art is considered using FIG. In the prior art, since the elastic body 40 fixed to the counter balancer side linear bearing 12c and the hammer bank side linear bearing 12b collide with each other at a speed v, the relative speed of the collision is 2v. Using the elastic body 40 as a criterion and the total mass on the hammer bank side as m and the relative velocity at the time of collision between the linear bearing 12b and the elastic body 40 as 2v, the energy E0 at the time of collision is expressed by the following equation. Is expressed.

E0 = 1/2 × m × (2v) ² = 2 mv ²

Therefore, the negative energy Es0 at the time of collision in the prior art is

[Equation 2]

Es0 = E0 × Ks = 2Ks · mv 2

It becomes If we take the difference between equation 1 and equation 2,

Es0-Es1 = 2Ks · mv ² -Ks · mv ² = Ks · mv ² > 0

In other words

Es0 ＞ Es1

It turns out that the negative energy at the time of a collision reduces by this invention. Therefore, the above configuration makes it possible to reduce the sound generated at the time of a collision and to avoid multiple collisions as in the prior art.

6 shows another example in which the elastic body 40 is disposed. 6 is a cross-sectional view of a plane through the central axis of the guide shaft 11.

Means for arranging the elastic body 40 near the central position of the linear motion receiving member 12b on the hammer bank 10 side and the linear motion receiving member 12c on the counter balancer 21 side, and the elastic body 40 and the guide shaft. It is set as the structure which provided the elastic support body 42 between (11). The elastic support 42 may be fixed by completely clamping the guide shaft 11 and the elastic body 40 to each other. For example, the elastic support 42 and the elastic support 42 may be made of an elastic material such as rubber. You may use the method of providing and fixing a frictional force between the guide shaft 11 and the elastic body 40, respectively. By setting it as such a structure, it becomes possible to aim at the collision noise reduction similarly.

In addition, as shown in Fig. 7, the reverse pressure means is composed of an elastic body 40 and a holder 50 arranged to support the elastic body 40, and the guide portion disposed at the tip of the holder 50 is provided. By arranging the elastic ring 55 with a small inner diameter and applying a friction force with the guide shaft 11, the elastic body 40 can be disposed at a substantially center position, and the same effects as described above can be obtained. In this case, a frictional force may be provided to both holders, or a frictional force may be applied to only one holder. However, it is natural that the friction force is sufficiently good that the elastic body 40 is sufficiently restored even when the elastic body 40 is compressed.

In addition, in the structure shown in FIG. 7, the holder 50 is pressed against the guide shaft 11 when it is inserted into the guide shaft 11 by deliberately shifting the center of the left and right holder 50 as shown in FIG. It is also possible to provide the above-described frictional force between the guide shaft 11 and the holder 50, and the same effect can be obtained. In addition, it is a matter of course that the same effect can be obtained by providing the holding force so that the elastic body as the reverse pressure means can be held at the intermediate position between the hammer bank side collision surface and the counter balancer side collision surface.

9 shows an example of the configuration of an elastic body portion that reduces the number of multi-collisions and prevents the occurrence of sound.

A shock absorbing material is disposed at both ends of the elastic body 40, and the shock absorbing material is composed of a shock absorbing material having a hardness determined from the point of durability and the like (here referred to as a solid shock absorbing material 61 for convenience) and a more flexible shock absorbing material 62. The flexible shock absorbing material 62 protrudes more than the rigid shock absorbing material 61, and when the linear motion bearing 12b and the linear motion bearing 12c and the elastic body 40 are closest to each other, the flexible shock absorbing material 62 is the inner side of the solid shock absorbing material 61. By setting it as the structure accommodated in the retreat part provided in the inside, the elasticity immediately after a collision will be about, and the elasticity after that will become weak.

With the above structure, the repulsive force of the elastic body 40 is weakened by the compression of the flexible cushioning material 62 at the time of collision, and the moving speed and the moving amount to the opposite side are smaller than in the prior art. Therefore, the impact after the secondary collision is also suppressed and the number of collisions is reduced. In addition, since the force applied when the collision surface is closest to each other becomes a durable shock absorbing material 62, the sound generated during the collision can be reduced while maintaining the durability of the shock absorbing material.

FIG. 10 shows a case where the shape of the shock absorbing material 60 is studied, and the elasticity is changed so as to become weak and then steel immediately after the collision in the middle of one shock absorbing material. Also in this structure, the effect similar to the above can be acquired. In addition, the material cost and the number of assembly steps according to the reduction of the number of parts can be reduced.

As described above, according to the present invention, the impact surface of the elastic body, which is the reverse pressure means, can be made weak after the collision, and thereafter, the elasticity can be changed to become steel, and the impact of the collision and the number of multiple collisions can be reduced. can do.

In addition, the sound level generated from the printing device can be lowered, the cost of the soundproofing material and the number of mounting steps can be reduced, and the printing device itself can be supplied at low cost.

Claims (5)

A hammer bank having a plurality of dot factor hammers, and a shuttle mechanism for reciprocating the hammer banks in a lateral direction, and driving the dot factor hammers during the reciprocating movement of the hammer banks to perform printing; A printing apparatus having a counter balancer for reciprocating in a reverse phase with a reciprocating movement of a bank, and inverting pressurizing means for imparting reverse pressure in the vicinity of an amplitude end of the reciprocating movement of the hammer bank or counter balancer, And the reverse pressurizing means is disposed at an approximately intermediate position between the collision surfaces of the hammer bank side and the counter balancer side. 2. The hammer bank, the counter balancer and the reverse pressurizing means are connected to a guide shaft for reciprocating movement, and the reverse pressurizing means is provided with a supporting material for supporting the guide shaft. Printing device. The printing apparatus according to claim 2, wherein the support member has a holding force as a holding force between the guide shaft and the guide shaft. The collision surface of the inverting and pressurizing means according to any one of claims 1 to 3, wherein the collision surface of the inverting and pressing means is a flexible cushioning material that absorbs the impact immediately after the impact of the hammer bank or counter balancer, and a rigid cushioning material that can withstand the subsequent inversion operation. Printing device characterized in that the layer structure. A hammer bank having a plurality of dot factor hammers, and a shuttle mechanism for reciprocating the hammer banks in a lateral direction, and driving the dot factor hammers during the reciprocating movement of the hammer banks to perform printing; In a printing device having a counter balancer for reciprocating in a reverse phase and a reverse phase of a bag, and a reverse pressure means for imparting reverse pressure to both ends of an amplitude of the reciprocating motion of the hammer bank or counter balancer. Each collision surface of the hammer bank side or the counter balancer side of the inverting and pressing means is a flexible buffer material that absorbs the impact immediately after the impact of the hammer bank or counter balancer, and a rigid buffer material capable of withstanding subsequent reversal operations. Printing device characterized in that the layer structure.