JPH0110206Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a recording device used in an X-Y plotter, an alphanumeric printer, etc., and in particular, a printing member drive for bringing a printing member such as a pen into pressure contact with recording paper. Regarding the mechanism.

FIG. 1 shows the main parts of a conventional pen-type recording device. This pen-type recording device has platen 1
A recording paper 2 held on the front side of the recording paper 2 is fed in the vertical direction (Y direction), and a pen 3 is provided oppositely to the recording paper 2 as a printing member. The pen 3 is movable together with a holding member (not shown) and a drive mechanism 10 in a direction perpendicular to the plane of the paper (X direction). Further, the pen 3 is driven by a drive mechanism 10 in a direction of pressure contact and separation (Z direction) with respect to the recording paper. That is, when not printing, the coil 11a of the solenoid 11 is energized, and the iron core 11b attracts the actuator 11c. The pen 3 engaged with the tip of the actuator 11c
is separated from recording paper 2. Further, during printing operation, the current to the coil 11a is cut off, and the spring 12
The force causes the actuator 11c and the pen 3 to be pulled in the direction of the platen 1, so that the tip of the pen comes into pressure contact with the recording paper 2.

However, in the conventional device described above, the pressure of the pen 3 against the recording paper is set by the spring 12, and when transitioning to a non-printing state, the solenoid 11 overcomes the force of the spring 12 and attracts the actuator 11c. It turns out. Therefore, in order to increase writing pressure, solenoid 1 with large suction force is required.
1 must be used. That is, as shown in FIG. 2, as the stroke l of the actuator 11c increases, the solenoid suction force F (α line) decreases. If the solenoid suction force F at that time is not set larger than the resistance force f (β line) by the spring 12 in the printing state (the state in which the pen 3 is in pressure contact with the recording paper 2), the pen 3 will not work. It becomes impossible to move in the Z direction. Therefore, in order to strengthen the spring 12 and increase the pen pressure, it is necessary to set the solenoid suction force F by adding a margin d to the resistance force f of the spring 12 in the printing state, and a large solenoid 11 is required. Become. In addition, the dashed-dotted line P in Figure 2
indicates the printing state position.

In addition, if the current flowing to the solenoid 11 decreases during use and the suction force decreases, or if mechanical resistance increases and the margin d decreases, the force of the spring 12 will cause the pen to 3 is recording paper 2
press against. As a result, malfunctions such as printing errors occur.

The present invention solves the above-mentioned conventional drawbacks, and reduces the load on the solenoid, making it possible to downsize the solenoid and reduce power consumption.It also increases writing pressure and reduces the suction force of the solenoid. It is an object of the present invention to provide a printing member driving mechanism for a recording device that can prevent erroneous printing by allowing the printing member to be stabilized in a non-printing state when such printing occurs.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 3A and the following drawings.

FIG. 3A is a side view of the main part of the pen type recording device showing a non-printing state, and FIG. 3B is a side view of the main part of the pen type recording device showing the printing state.

Similar to that shown in FIG. 1, a recording paper 2 is held in front of the platen 1, and the recording paper 2 is fed out in the vertical direction (Y direction) in the figure. Further, an oil-based or water-based pen 3, which is a printing member, is held by a holding member (not shown) and is movable in a direction perpendicular to the plane of the paper (X direction). A drive mechanism 20 according to the present invention is provided on this holding member, and the operation of this drive mechanism 20 causes the pen 3 to press against and away from the recording paper 2 on the holding member in the direction (Z direction). It is designed to slide. The tip of the pen 3 is supported by a leaf spring 21, and the rear end of the pen 3 is in contact with a push-out body 22. The pen 3 is always brought into pressure contact with the extrusion body 22 due to the biasing force in the A direction by the leaf spring 21. The extruded body 22 is configured to swing around a fulcrum 22a. Moreover, the extrusion body 22 is urged in the direction of B by the extrusion spring 23,
This force constantly pushes the pen 3 in a direction in which it comes into pressure contact with the recording paper 2. Note that the movement of the push-out body 22 in the direction opposite to the direction of arrow B is regulated by a stopper 24. On the other hand, the solenoid 25 includes a yoke 25a made of a magnetic material, an iron core 25b fixed to the center thereof, and a coil 25c wound around the iron core 25b. Furthermore, an actuator 25d is provided at a position in front of the yoke 25a. This actuator 2
5d swings around a fulcrum 25e provided above. Actuator 25d
A permanent magnet 25f and a movable iron core 25 are mounted on the inner surface of the
g is provided. Since this permanent magnet 25f is provided and the coil 25c can be energized in both directions with respect to the coil winding direction,
This solenoid 25 is of a self-holding type in which the actuator 25d is stabilized in the two-way operating positions C and D. Further, a return spring 26 is attached to the actuator 25d to bias it in two directions. Furthermore, the upper end of the extrusion body 22 is in contact with the surface of the lower end of the actuator 25d on the side opposite to the recording paper 2. The force with which the return spring 26 presses the actuator 25d in the two directions is set larger than the force with which the extrusion spring 23 presses the extrusion body 22 in the two directions. Therefore, when the coil 25c of the solenoid 25 is not energized, the actuator 25d pulls the pusher body 22 back in two directions as shown in FIG. 3A, and the pen 3 is stabilized in a state away from the recording paper 2. It's becoming like that.

Next, the operation and effects of the present invention with the above configuration will be explained.

FIG. 3A shows a non-printing state. In this state,
The actuator 25d is pulling the extrusion body 22 back in the two directions, the extrusion body 22 comes into contact with the stopper 24, and the pen 3 is pushed back in the direction A by the leaf spring 21, and the tip of the pen 3 is separated from the recording paper 2. ing.

In this state, the coil 25c of the solenoid 25
When energized, actuator 25d is moved by magnetic force.
is attracted to the iron core 25b and rotates in the direction C. Along with this, the push-out body 22 is pulled by the force of the push-out spring 23, and the pen 3 moves in a direction approaching the recording paper 2. At this time, the force Fx required for the iron core 25b to attract the actuator 25d is determined from the following conditions. That is, since the actuator 25d is pulled in two directions by the return spring 26, a counterclockwise moment _M1 acts on the actuator 25d. Therefore, due to this moment _M1 , a suction resistance force Fa is generated at the attachment portion of the flexible iron core 25g. On the other hand, the extrusion body 22 is acted on by an elastic force in the direction B by the extrusion spring 23 and a force in the direction A by the plate spring 21. A moment M ₂ in the direction is acting. Since the push-out body 22 is in contact with the actuator 25d, this moment _M2 causes a clockwise moment _M3 to act on the actuator 25d. Due to this moment _M3 , an auxiliary suction force Fb is generated at the attachment portion of the flexible iron core 25g. From the above,
Force required to attract actuator 25d
Fx is obtained by adding a certain margin d to (Fa-Fb). As can be seen from this formula,
By appropriately setting the elastic forces of the return spring 26 and the push-out spring 23, it is possible to minimize Fx.
Therefore, the smallest solenoid 25 can be used, and the margin d can also be made sufficiently large.

Next, due to the magnetic force, the possible iron core 25g is
After being attracted to b, the permanent magnet 25f maintains the attracted state even if the current to the coil 25c is cut off. At this time, the lower end of the actuator 25d separates from the upper part of the extrusion body 22, as shown in FIG. 3B. Therefore, the pen 3 is pushed in the direction R only by the elastic force of the extrusion spring 23, and the tip of the pen 3 comes into pressure contact with the recording paper 2. The writing pressure of the pen 3 is determined only by the force of the extrusion spring 23. Then, in the state shown in Figure 3B, the recording paper 2
in the vertical direction (Y direction), and the holding member that holds the pen 3 in the direction perpendicular to the page (X direction).
By moving to , characters and
Shapes etc. are drawn. Note that the movement of each member in the X and Y directions is generally performed using power from a pulse motor or the like.

Furthermore, when the coil 25c of the solenoid 25 is energized in the opposite direction in the state shown in FIG. 3B, the actuator 25d is separated from the iron core 25b and the third A
Return to the non-printing state of the figure.

In the example shown in FIG. 3, a stopper 24 for stabilizing the pen 3 away from the recording paper 2 is provided behind the pusher body 22, but as shown in FIG. It may be provided at the rear of the

Further, in the illustrated embodiment, both the extruded body 22 and the actuator 25d are connected to the fulcrums 22a and 25e.
However, as another example, a guide mechanism may be provided to slide the extrusion body 22 and the actuator 25d in the horizontal direction (Z direction).

Furthermore, although the illustrated embodiment shows a pen-type recording device that uses a pen as a printing member, the printing member is a dial, and the present invention can also be applied to a small printer that prints this dial on recording paper. In addition, the recording paper is fixed and the pen moves in the X-Y direction.
This can also be applied to Y plotters.

As described above, according to the present invention, the following effects can be achieved.

1. Since the elastic force of the return spring 26 acting on the actuator 25d is set larger than that of the pushing spring 23 acting on the pushing body 22, when suction by the solenoid 25 is not performed,
The printing member such as the pen 3 is stabilized when it is separated from the recording paper. Therefore, even when the suction force of the solenoid decreases due to battery exhaustion and becomes inoperable, the non-printing state remains stable. This prevents printing errors from occurring.

2 The resistance force acting on the actuator 25d sucked by the solenoid 25 is the return spring 26
It is determined by the difference between the force exerted by the push-out spring 23 and the force exerted by the extrusion spring 23. Therefore, by reducing the difference in force between the two springs, the required suction force can be set small. Therefore, the solenoid can be made smaller and the power consumption of the solenoid can be reduced. Also,
Since a large margin can be maintained between the suction force of the solenoid and the resistance force, malfunctions of the mechanism will not occur.

3. Since the actuator 25d separates from the extrusion body 22 while the printing member is in pressure contact with the recording paper, the pressing force (writing pressure) of the printing member is determined by the extrusion spring 23. Therefore, by increasing the spring pressure, this pressing force can be made sufficiently large. Moreover, even if the force of the push-out spring 23 is increased in this way, the return spring 26 is also increased accordingly, so that the actuator 2 in the state shown in FIG. 3A is
The suction resistance force (Fa-Fb) of 5d can be made small, making it unnecessary to increase the size of the solenoid 25. Note that when the return spring 26 is increased, the resistance force acting on the actuator 25d immediately after the actuator 25d is separated from the extrusion body 22 becomes only Fa, which rapidly increases. However, when the actuator 25d leaves the extrusion body 22, the possible iron core 2
Since the distance (stroke) between 5g and the iron core 25b becomes smaller, the attraction force due to the magnetic force of the solenoid becomes larger (see Fig. 2), and a sufficient margin is ensured. Therefore, it is possible to use a small solenoid and increase the pressing force of the printing member.

4. As stated in claim 2, if a self-holding solenoid is used, the power consumption by the solenoid can be further reduced.

[Brief explanation of drawings]

Fig. 1 is a side view showing the main parts of a conventional pen-type recording device, Fig. 2 is a diagram showing the characteristics of the suction force by a solenoid, and Fig. 3A and subsequent figures show an embodiment of the present invention. FIG. 3A is a side view of the main parts of the pen-type recording device showing a non-printing state, FIG. 3B is a side view of the main parts of the pen-type recording device showing the printing state, and FIG.
The figure is a side view of the main parts of a pen-type recording device according to another embodiment. 1...Platen, 2...Recording paper, 3...Printing member,
20... Printing member drive mechanism, 22... Extrusion body, 23
... Extrusion spring, 24... Stopper, 25... Solenoid, 25b... Iron core, 25c... Coil, 25d... Actuator, 25f... Permanent magnet, 26... Return spring.

Claims (1)

[Claims for Utility Model Registration] 1. In a recording device that is equipped with a printing member that moves relative to the recording paper and presses against and separates from the recording paper, the printing member moves in the direction of the recording paper by being attracted to a solenoid, and An actuator is biased in a direction away from the recording paper by a return spring, and an extrusion body is biased by an extrusion spring to press the printing member toward the recording paper, and the extrusion body is latched to the actuator and When the printing member comes into pressure contact with the recording paper, the actuator is moved away from the extrusion body, and while the actuator and the extrusion body are locked, the actuator is moved in the direction away from the recording paper by the return spring. 1. A printing member drive mechanism for a recording device, wherein a biasing force is set to be larger than a force in a direction in which a recording sheet is pressed against an actuator by an extrusion spring. 2. The printing member drive mechanism for a recording device according to claim 1, wherein the solenoid is of a self-holding type that is stable in a state in which the actuator is attracted and in a state in which it is separated.