JPH0721424B2 - Pen up / down device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen up / down device used for up / down operation of a recorder such as a plotter and a recorder.

2. Description of the Related Art Conventionally, a pen up / down device of this type includes a solenoid as an up / down drive source of a pen, and a plunger of the solenoid is moved up and down by applying an electric current to the solenoid, so that the pen is moved up and down. There is.

FIG. 4 shows the structure of a conventional pen up / down device. Fourth
In the figure, reference numeral 1 is a base to which a solenoid 2 is fixed. The rotation center shaft 3 penetrates through the base 1, and the movable piece 4 is also attached to the rotation center shaft 3. Movable piece 4
One end of the rotation center shaft 5 for coupling with the pen holder 6
Are arranged. A pen 7 is fixed to the pen holder 6. A compression coil spring 8 is used between the movable piece 4 and the solenoid 2 to constantly generate a force for pulling up the pen 7.

Next, the operation of the above conventional example will be described. In FIG. 4, when the solenoid 2 is energized, the plunger 9 of the solenoid 2 is pulled in the direction (a). Then Plunger 9
The movable piece 4, which is fixed to, rotates about the rotation center axis 3. At this time, the pen holder 6 and the pen 7, which are fixed to the other end of the movable piece 4, move in the direction of (b). When the energization of the solenoid 2 is stopped, the compression coil spring 8 extends and the pen 7 returns to its original position.

As described above, the conventional pen up / down device can also perform the basic operation of pen up / down movement.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional pen up / down device, since the solenoid is used as a drive source, the drive force is adjusted to control the pen pressure and the brake is applied before the pen reaches the recording surface. You cannot apply force to protect the pen tip. Also, because the drive source and the pen section are separated, it is necessary to use mechanical parts with high component accuracy or to have a structure with a lot of play, so sufficient performance in recording accuracy can be obtained. There was a problem of not having.

The present invention solves such conventional problems,
It is an object of the present invention to provide an excellent pen up / down device that can realize highly accurate recording by adjusting the pen pressure and a structure with less backlash.

Means for Solving the Problems In order to solve the above problems, the present invention has a structure in which a stroke bearing is attached to a shaft on one end side of a mover, and two radial bearings are sandwiched on the shaft by springs on the other end side. It was done.

Operation According to the present invention, therefore, the pen writing pressure suitable for the pen type can be controlled by having the moving coil type actuator, the parts with less mechanical play and the structure for holding them, and accurate recording can be obtained. It has the effect of being able to.

Embodiment FIG. 2 shows the structure of an embodiment of the present invention. Ten
Is a magnet and lower case 11 so that the same poles face each other.
It is fixed to. A yoke 12 is arranged between the lower case 11 and the upper case 13 to form a magnetic circuit. A voice coil bobbin 15 having a coil 14 wound therein is placed in this magnetic circuit.

FIG. 1 shows the structure of the mechanism of the pen lifting device, in which a stroke bearing 17 is fixed to one side of a mover 16 which is integrated with a voice coil bobbin 15. On the other hand, a fixed radial bearing 18 and a movable radial bearing 20 fixed to a swing arm 19 are arranged, and a shaft 21 is sandwiched by a force generated by a spring 22. Attach the pen holder 23 to the mover 16
It is designed to operate in the same way as. The pen 24 is also engaged with the pen holder.

Next, the operation of the above embodiment will be described. In the above embodiment, when the coil 14 is energized, the magnet as shown in FIG.
Since the coil current flows in the direction perpendicular to the magnetic field formed by 10 and the yoke 12, the voice coil bobbin 15 is (c)
The force to move in the direction of works. Since the boil coil bobbin 15, the mover 16, the pen holder 23, and the pen 24 are integrated, the pen 24 also moves in the direction of (c). At this time, since the position of the mover 16 is restricted by the two types of bearings, the stroke bearing 17, the radial bearings 18 and 20, and the two shafts 21 and 25, there is little sliding load in the direction of (c). Operate. The stroke bearing 17 has a difference of 0 to +3 μm between the outer diameter of the shaft 25 and the inner diameter of the stroke bearing 17 so as to minimize play at the pen tip.
I have to. The other radial bearings 18, 20 are
Although the structure is such that 21 is sandwiched, a spring 22 is arranged so as to generate a force that overcomes the force F acting on the pen tip during drawing as shown in FIG. The operation of raising the pen can be realized by applying a reverse current to the coil.

As described above, according to the above-described embodiment, an operation with less backlash can be performed, and by controlling the current, it is possible to select the optimum writing pressure for the type of the pen to be used, and the braking force when the pen reaches the recording surface. This has the effect of enabling the pen to reach the recording surface with less impact, so-called soft landing control.

EFFECTS OF THE INVENTION As apparent from the above embodiment, the present invention has a structure in which a stroke bearing is attached to the shaft on one end side of the mover, and two radial bearings are sandwiched on the shaft by springs on the other end side. By having the die actuator, the parts with less mechanical play, and the structure for holding them, it is possible to control the pen writing pressure suitable for the pen type, and it is possible to obtain accurate recording.

[Brief description of drawings]

FIG. 1 is a block diagram of a pen up / down device in an embodiment of the present invention, FIG. 2 is a magnetic circuit block diagram of the device, FIG. 3 is a relational diagram of forces around a pen, and FIG. 1 is a schematic view of the device. 10 …… Magnet, 11 …… Lower case, 12 …… Yoke, 13
…… Upper case, 14 …… Coil, 15 …… Voice coil bobbin, 16 …… Mover, 17 …… Stroke bearing, 18
…… Radial bearing, 19 …… Swing arm, 20…
… Radial bearings, 21 …… Axis, 22 …… Springs, 23 ……
Pen holder, 24 …… pen, 25 …… axis.

Claims (1)

[Claims] 1. A yoke, around which a coil is wound, is attached to the center, shafts are attached to both ends, and one of the shaft and the upper case to which the main body of the recording apparatus is attached is slidably attached. Stroke bearings,
A mover in which the stroke bearing and a lower case to which a magnet is attached are integrally attached, a recording pen attached to the mover and capable of recording on a recording sheet, and a first radial bearing on one side of the shaft. The second that is rotatably abutted with and can move on the other side
Pen up-and-down device provided with a radial bearing of a. And a holding portion that holds both shafts by the biasing force of the springs.