JP2964903B2 - Printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus, and more particularly to a dot printing apparatus using a wire.

[0002]

2. Description of the Related Art A printing unit 1 of a conventional dot printing apparatus.
00 will be described with reference to FIG.

A printing unit 100 has a U-shaped frame member 102 having a contact portion 112 at one end.
A piezoelectric element 103 formed by laminating piezoelectric ceramics having a rear end fixed in a gap provided at the center of the frame member 102, a movable element 104 fixed to the front end of the piezoelectric element 103, and a movable element A link mechanism member 105 fixed to the frame member 102, a first end is brazed to the mover 104, and a second end is connected to the frame member 1
02, and an arm 109 having the other end fixed to the arm 109 and an arm 109 joined to a fixed portion 108 on the other end side of the spring body 106 at one joint 114 by resistance welding. , A print wire 110 brazed to the tip 109 b of the arm 109, and a stopper member 111 fixed to the central lower end of the arm 109.

Next, the operation of the printing unit 100 of the conventional dot printing apparatus will be described. When the piezoelectric element 103 and the mover 104 extend in the direction of arrow A by applying a voltage, the link mechanism member 105 moves the mover 104 While the movable member 104 is guided so that the movable member 104 moves parallel to the direction in which the piezoelectric element 103 extends, the fixed portion 108 at the other end of the spring body 106 is rotationally displaced in the direction of arrow B. As a result,
The print wire 110 at the tip of the arm 109 advances in the direction of arrow C. Then, printing is performed on the printing paper 113 by moving the printing wire 110 in the direction of the arrow C, that is, moving forward.

When the voltage application to the piezoelectric element 103 is stopped,
The printing wire 110 has an arrow C due to the elasticity of the piezoelectric element 103 returning to its original state and the elastic restoring force of the spring body 106.
Go in the opposite direction.

When the printing wire 110 retreats and stops at a position closer to the frame member 102 than a predetermined position, the start of the next hitting point of the printing wire 110 is delayed. In order to prevent this, a stopper member 111 is provided at the lower end of the center of the arm 109, and a contact portion 112 is provided at the front end of the frame member 102.
The print wire 110 stops at a predetermined position by contacting the contact portion 112.

[0007]

However, in the conventional apparatus, the printing wire 113 is not connected to the printing paper 113.
When the gap up to the normal gap is changed from the normal gap to the abnormal gap that is further widened, the amount of movement of the printing wire 110 becomes large due to inertia. Therefore, when the printing wire 110 retreats and stops at a predetermined position, The stopper member 111 fixed to the lower end of the center of the
2, the return speed of the arm 109 is increased, so that the fixed portion 108 of the arm 109 and the spring body 106 is fixed.
The stress applied to the junction 114 becomes higher than in the normal gap. Further, it is difficult to stably form the surface contact state between the stopper member 111 and the contact portion 112 due to the influence of the positional accuracy of the fixed spring body 106 and the like.
Because of the line or point contact as shown in FIG.
When the stopper member 111 fixed to the central lower end of the arm collides with the contact portion 112, the arm 109 is twisted in the direction of arrow D, so that a tensile stress is applied to a joint 114 between the arm 109 and the connecting portion 108 of the spring body. As a result, the arm 10
There are problems such as breakage of the joint 9 and peeling of the joint 114.

Further, in the conventional device, the spring body 10
Since the number of bonding points between the arm 6 and the arm 109 is one, the frequency of occurrence of the above-described problem is high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a stable printing apparatus with few failures and high quality.

[0010]

To achieve this object, a printing apparatus according to a first aspect of the present invention includes a frame member provided with a driving member that is displaced in response to an external signal, and a driving member. A spring body having one end fixed to the drive member and driven in accordance with the displacement of the driving member, and an arm fixed to the other end of the spring body and advancing or retracting the printing wire in response to the driving of the spring body. Is fixed to the fixed part between the other end of the arm and the spring body to reinforce and protect the fixed.
And a member fixed to the spring body.
A protection means including a plate member arranged so as to sandwich the arm is provided.

Further, the printing apparatus according to claim 2, the coercive
The thickness of the plate member constituting the protection means is equal to the thickness of the arm.
It is configured about twice .

Further, in the printing apparatus according to the third aspect, a spring is provided.
After stacking the body, arm and protection means in this order,
At the same time, it is fixed at two or more joint points by resistance welding
It becomes.

According to a fourth aspect of the present invention, there is provided a printing apparatus comprising: a frame member provided with a driving member which is displaced in response to an external signal; and a spring having one end fixed to the driving member and driven in accordance with the displacement of the driving member. A printing device comprising: a body; and an arm fixed to the other end of the spring body for moving a printing wire forward or backward in response to driving of the spring body.
Is the thickness of the base end portion, which is the portion fixed to the spring body,
The thickness of the tip where the print wire is attached
1.5 times or more and 3 times or less of the
Is provided.

Further, the printing apparatus of claim 5, wherein the bar
Two or more joint points between the body and the arm by resistance welding
It is formed by fixing.

Further, in the printing apparatus according to the present invention, a frame member provided with a driving member which is displaced in response to an external signal, and a spring having one end fixed to the driving member and driven in accordance with the displacement of the driving member. In a printing apparatus including a body and an arm fixed to the other end of the spring body and moving the printing wire forward or backward in response to driving of the spring body, the spring body and the arm are joined at a plurality of joining points.

[0016]

[Action] claims 1 of the present invention having the above configuration 3
In the printing device described in (1), the spring body
The protection means consisting of a plate member arranged so as to sandwich the arm thereby reinforces and protects the fixed portion between the arm for moving the print wire forward or backward and the spring body.

Here, in the printing apparatus according to the second aspect, the thickness of the plate member constituting the protection means is equal to the thickness of the arm.
By setting the thickness to approximately twice the thickness, the adhesion is reinforced and protected.

Further, in the printing apparatus according to the third aspect, the spring body, the arm, and the protection means are superposed in this order.
At the same time at two or more joint points by resistance welding
The attachment secures and protects the attachment.

In the printing apparatus according to the fourth aspect , the thickness of the base end portion, which is a portion fixed to the spring body, is set to the mark.
The thickness of the tip, where the U-shaped wire is attached,
1.5 times or more and 3 times or less, while the R part is
In this case, the thick fixed portion of the arm is fixed to the spring body, and the R portion absorbs and absorbs stress.

Further, in the printing apparatus according to the fifth aspect, the spring body and the arm are connected at two or more places by resistance welding.
Stick at the junction .

Further, in the printing apparatus according to the sixth aspect, the spring body and the arm are joined at a plurality of joining points.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the structure of a printing unit according to a first embodiment of the present invention. The basic structure and operation of the printing unit are the same as those of a conventional printing unit, and a detailed description thereof will be omitted. I do.

As shown in FIG. 1, a movable element 6 is attached to the upper end of the piezoelectric element 3, and both of them constitute a driving member. The lower end of the spring body 7 is formed in a bifurcated shape, and one of the lower ends (first end)
Is brazed to the mover 6, and the other (second end) is brazed to the frame member 2. The upper end (the other end) of the spring body 7 is formed so as to extend to near the upper end of the base end 9 a of the arm 9, and is fixed at the fixing portion 8 at two joining points by resistance welding. At the fixing portion 8, a plate member 13 made of an iron plate corresponding to a protection means is fixed at two joint points 4 by resistance welding so as to sandwich the spring body 7 and the arm 9. That is, after the spring member 7 and the arm 9 and the plate member 13 are overlapped in this order, they are simultaneously fixed at two joint points 4 by resistance welding.

The thickness of the plate member 13 is about twice the thickness of the arm 9 as shown in FIG.
Can be easily performed at the same time, and the fixed portion 8 can be sufficiently reinforced and protected. In addition, the plate member 13
If the thickness is more than twice the thickness of the arm 9, the fixing portion 8 can be reinforced and protected more strongly. However, the overall thickness becomes too thick, so that simultaneous welding with the spring body 7 can be performed. Although this cannot be easily performed, in this case, welding is performed separately or the plate member 13 is bonded to the arm 9 with an adhesive.

As described above, in the present embodiment, the plate member 1
3, the fixing portion 8 between the spring body 7 and the arm 9 is reinforced and protected, and the spring body 7 and the arm 9 are fixed at two joint points 4 by resistance welding to reduce the joint area between the spring body 7 and the arm 9. It is configured to increase the number of print wires 1
0, it is possible to sufficiently absorb the impact when the stopper member 11 collides with the contact portion 12 of the frame member 2 after the printing with 0, and to prevent the arm 9 from breaking or the arm 9 from peeling off from the spring body 7, Durability can be improved.

FIGS. 3 and 4 are diagrams showing the configuration of a printing unit according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. I do.

The arm 19 has a base 19a and a tip 19b. The printing wire 10 is attached to the tip 19b, and the spring body 7 is attached to the fixed portion 8 of the base 19a. It is fixed at two joint points 4 by welding. Further, the arm 19 has a thickness of the tip 19b of about 0.2 mm and a thickness of the base 19a of about 0.4 mm, which is about twice as large. Since the impact transmitted from the distal end portion 19b is reduced and absorbed by the R portion 19c, the impact is not directly transmitted to the base end portion 19a, that is, the fixed portion 8, so that the fixed portion 8 can be protected. The thickness of the base end 19a of the arm 19 is preferably about 0.3 mm to 0.6 mm (about 1.5 to 3 times the tip 19b).

As described above, in this embodiment, the arm 1
9, the thickness of the base end portion 19a is increased so that the spring body 7 and the arm 1
9 is firmly fixed, and the spring body 7 and the arm 19 are fixed at two joint points 4 by resistance welding.
The structure is such that the joint area between the arm member 19 and the arm 19 is increased, so that the impact when the stopper member 11 collides with the contact portion 12 of the frame member 2 after printing by the printing wire 10 can be sufficiently absorbed. It is possible to prevent the arm 19 from being broken or the arm 19 from peeling off from the spring body 7, thereby improving the durability.

In each of the above embodiments, the spring body 7 and the arms 9 and 19 are joined at two joint points 4 by resistance welding.
Although it is configured to increase the joint area between the spring body 7 and the arms 9 and 19 by being fixed by the above, the joint may be made at three or more joint points. In the present invention, it is not always necessary to provide protection means or increase the thickness of the portion where the arm is fixed, and in some cases, it is only necessary to join the spring body and the arm at a plurality of joining points.

[0031]

As described above in detail, in the printing apparatus of the present invention, since the joint between the spring body and the arm is strengthened, failures can be reduced and the quality of the product can be stabilized.

[Brief description of the drawings]

FIG. 1 is a front view of a printing unit according to a first embodiment of the present invention.

FIG. 2 is a top view of the printing unit.

FIG. 3 is a front view of a printing unit according to a second embodiment of the present invention.

FIG. 4 is a top view of the printing unit.

FIG. 5 is a front view of a conventional printing unit.

FIG. 6 is an explanatory side view for explaining a problem state in the related art.

[Explanation of symbols]

 2 Frame member 3 Piezoelectric element 4 Joining point 6 Mover 7 Spring body 8 Fixed part 9 Arm 10 Printing wire 11 Stopper member 12 Contact part 13 Plate member 19 Arm

Claims (6)

(57) [Claims] A frame member provided with a driving member that is displaced in response to an external signal; a spring body having one end fixed to the driving member and driven in accordance with the displacement of the driving member; A printing device comprising an arm fixed to an end and advancing or retreating a printing wire in response to driving of a spring body, wherein the arm is fixed to a fixing portion of the arm and the spring body for reinforcing and protecting the fixing. The spring body
Arranged so that the arm is sandwiched between
A printing device, comprising a protection means made of a plate member provided . 2. The thickness of a plate member constituting said protection means.
2. The printing device according to claim 1 , wherein the thickness of the arm is approximately twice the thickness of the arm . 3. The spring body, the arm, and the protection means are arranged in this order.
No. 2 at the same time by resistance welding
The printing apparatus according to claim 1, wherein the printing apparatus is fixed at the above-mentioned joining points . 4. A frame member provided with a driving member that is displaced in response to an external signal, a spring body having one end fixed to the driving member and driven in accordance with the displacement of the driving member, An arm fixed to the end and advancing or retracting the print wire in response to driving of the spring body, wherein the arm has a base end portion that is a fixed portion with the spring body.
Adjust the thickness to the point where the print wire is attached.
At least 1.5 times and no more than 3 times the thickness of the end, and
A printing device characterized by providing an R portion between them . 5. The spring body and the arm are connected by resistance welding.
The printing apparatus according to claim 4, wherein the printing apparatus is fixed at two or more joint points . 6. A frame member provided with a driving member that is displaced in response to an external signal, a spring member having one end fixed to the driving member and driven in accordance with the displacement of the driving member, and a spring member. A printing device, comprising: an arm fixed to an end and advancing or retracting a printing wire in response to driving of a spring body, wherein the spring body and the arm are joined at a plurality of joining points. .