JPH0219407B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording pen up-and-down device used in recorders such as pen recorders and XY recorders that use recording pens to record analog displacement amounts on recording paper.

Prior Art FIG. 3 shows a conventional recording pen up/down device. Third
In the figure, 1 is a recording pen, and this recording pen 1
is held in the pen holder 2. The pen holding device includes a long hole 11 and a round hole 1 in the guide plate 4 of the pen holding part 2.
2 is held by guide pins 5 and 6 so as to be slid in the vertical direction. The guide plate 4 of the pen holder 2 is held by the slider 3. A sliding shaft 8 guides the slider 3, and is fixed to the left and right side plates and the mounting plate. 7 is a pen list axis, which moves the pen 1 up and down with respect to the recording paper 10. 9
is a tension system in which the slider 3 is moved left and right by a servo motor.

Next, the operation of the conventional example will be explained. A tension system 9 connected to a servo motor moves the slider 3 left and right, and a recording line is drawn on the recording paper 10 by the recording pen 1. The pen holder 2 is positioned in the left-right and front-rear directions with reference to the guide pin 6, and is positioned in the front-rear direction by the guide pin 5 to prevent the recording pen 1 from wobbling in the front-rear, left-right directions. .

Problems to be Solved by the Invention However, in the above conventional example, since two guide pins 5 and 6 are required, the guide pins 5 and 6 are required.
If the parallelism of the guide plate 6 and the parallelism and straightness of the bearing holes of the guide plate 4 guided by the guide pins 5 and 6 do not match, the pen cannot be moved up and down smoothly. Therefore, in order to move the pen up and down smoothly, it is necessary to improve the installation accuracy of the guide pins 5 and 6 and the accuracy of the shaft hole of the guide plate 4.
Furthermore, it is necessary to make the hole elongated like the shaft hole of the guide pin 5 to avoid machining errors in only one direction. When such escape holes are provided, there is a drawback that mechanical play occurs in the direction of the elongated hole, causing a decrease in the fidelity of the recorded waveform.

SUMMARY OF THE INVENTION The present invention eliminates the drawbacks of the conventional example described above, and aims to provide an excellent recording pen up/down device that can be downsized as a whole even in the case of a multi-line pen arrangement.

Means for Solving the Problems In order to achieve the above object, the present invention provides only one guide pin of the holder that guides the pen up and down, and the central axis of the tip of the recording pen attached to the pen holder. The centers of the guide pins are made to coincide with each other, and a protrusion for preventing rotation is provided on the slider portion connected to the pen holding portion.

Effects According to the present invention, with the above-mentioned configuration, by bringing the protrusion into contact with the flat surface of the slider section and sliding it, the pen can be moved up and down smoothly and a faithful waveform can be recorded.

Embodiment The configuration of an embodiment of the present invention will be described below.

In FIG. 1, 20 is a recording pen, and this recording pen 20 is coupled to a pen holder 22. As shown in FIG. The pen holder 22 is connected to the slider 23 and is provided with a rotation prevention protrusion 21 . The guide pin 24 is passed through the guide pin bearing hole 31 provided in the slider portion 23 and the guide pin 24 is fixed to the slider body 25. The slider body 25 is guided by two sliding shafts 26 and 27. The slider portion 23 is moved up and down in the direction of arrow A by a pen lift shaft 28. The tension system 29 is fixed to the slider body 25 and slides the slider in the direction of the left and right arrow B by a servo motor.

Next, the operation of the above embodiment will be explained. 1st
In the figure, the slider 23 is guided by a guide pin 24, and the axis center of the guide pin 24 is aligned with the recording pen 20.
is placed in line with the center of the tip. Slider 2
Anti-rotation protrusions 21 are provided at both ends of the slider 3 and are in surface contact with the side surfaces of the slider body 25. Therefore, the pen holder 22 and the recording pen 20, which are coupled to the slider 23, do not rotate during recording.

Further, this will be explained in detail using FIG. 2.

The tip point P of the recording pen 20 shown in FIG. The play is proportional to the mounting position (side view h), the length (side view l ₁ ), and the distance l ₂ from the bottom of the slider 24 to the point P of the pen tip, but by making l ₁ greater than l ₂ , The play of the tip point P of the recording pen 20 can be reduced.

In addition, the protrusion 21 for preventing three left and right rotations of the slider 23
is the slider body 25 as shown in cross-sectional view A-A'.
Since the pen tip is guided with a certain gap between the two, it is possible to prevent the pen tip from rotating in the direction of arrow B during recording, about the point P of the pen tip.

In this embodiment, the guide pin 24 that guides the pen up and down has a single axis, and even if the bearing hole 31 of the slider 23 is made smaller, the recording pen 20 can be moved up and down smoothly to draw a faithful waveform 30. , it is possible to supply a pen up/down device with a simple structure and at low cost.

The above embodiment has the following advantages.

(a) Since the center of the pen tip and the center of the guide pin are aligned, mechanical play can be reduced even if the pen rotates left, right, front and back during recording, and since the guide pin of the pen up and down mechanism is on one axis, mechanical play can be reduced. Since the fitting dimensions can be reduced, waveform fidelity can be increased.

(b) Furthermore, since the recording pen can be moved smoothly using a single guide pin and the pen can be moved up and down in the vertical direction, recording pens that are close to each other will not come into contact with each other even when used with a plurality of recording pen holding devices.

Effects of the Invention As is clear from the above embodiments, the present invention provides only one guide pin of the pen holder that guides the pen up and down, and the central axis of the tip of the recording pen attached to the pen holder and the guide pin. Align the centers of the pins,
Since the slider part connected to the pen holding part is provided with a protrusion to prevent rotation, this protrusion contacts and slides on the flat surface of the slider part, allowing the recording pen to be made thinner and more When the pens are arranged in series, the spacing can be narrowed and the overall size can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a recording pen up/down device according to an embodiment of the present invention, and FIG. 2 is a partial detailed view of the same embodiment.
FIG. 3 shows a conventional recording pen up/down device. 20...Recording pen, 21...Rotation prevention protrusion, 2
2...Pen holder, 23...Slider, 24...
Guide pin, 25...Slider body, 26...Sliding shaft, 27...Sliding shaft, 28...Pen lift shaft,
29... Tension system, 30... Waveform, 31... Bearing section.

Claims (1)

[Claims] 1. A slider body that is slidably attached along two horizontally parallel sliding axes and slides by the tension of the tension thread, and a slider body that is housed in this slider body and is attached vertically. a slider movable vertically along a guide pin; a recording pen attached to the slider; anti-rotation protrusions provided at both ends of the slider and in surface contact with side surfaces of the main body; A recording pen up-and-down device comprising a pen lift shaft that moves up and down, and a projection for up and down movement that comes into contact with the pen lift shaft by its own weight.