JPH0523049U - Soot writing record pen structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The mass at the position away from the fulcrum is reduced to improve the frequency characteristics, and the height from the tip of the needle for recording on the recording paper to the upper surface of the arm supporting the needle is reduced. Provide a recording pen capable of performing accurate recording by suppressing the twist of this portion. [Structure] One end is a fulcrum, and the other end is attached to the other end side of an arm 5 which is shaken in the horizontal direction intersecting the moving direction of the recording paper wound on the drum with respect to the surface of the drum above the drum. The needle 15 is directly fitted to the pipe 6 facing the surface of the drum in the normal direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a recording instrument such as a seismograph, and more specifically, a recording device of a soot-writing recorder for scratching a recording paper with soot attached by smoke to obtain a minute recording waveform. Regarding pen structure.

[0002]

[Prior Art]

 FIG. 3 is an explanatory diagram showing a schematic configuration of a recording instrument such as a seismograph. In the figure, reference numeral 1 denotes a cylindrical drum in which recording paper having soot attached by smoke is wound for one round, and is rotated in a direction of an arrow A at a constant speed by a driving device such as a synchronous motor (not shown). Reference numeral 2 is a galvanometer, and the information of the measurement results such as earthquakes, which has been converted into an electric signal and transmitted, is converted into a physical quantity by the galvanometer 2 and becomes the rotation angle of the rotating shaft 3 which can be visually observed. It

Reference numeral 4 is a recording pen for enlarging the rotational movement of the rotary shaft 3 and recording a minute measurement result on a recording paper wound around the drum 1 as an amplitude. One end of the recording pen 4 is attached to the rotary shaft 3. It is attached, and swings horizontally with respect to the surface of the drum 1 above the drum 1 while drawing an arc at the other end with this rotating shaft 3 as a fulcrum. In this way, the rotational movement of the rotary shaft 3 is converted into an amplitude movement on the other end side of the recording pen 4, and the other end side of the recording pen 4 is moved in the left-right direction with respect to the moving direction of the recording paper due to the rotation of the drum 1. Therefore, the information of the measurement result such as the earthquake converted from the electric signal by the galvanometer 2 into the physical quantity as the rotation angle of the rotating shaft 3 is recorded as a fine measurement result on the recording paper.

FIG. 4 is a perspective view showing a conventional recording pen, FIG. 5 is a sectional view of a main part of the conventional recording pen, FIG. 5A is a front view, and FIG. 5B is a side view. Reference numeral 5 is an arm made of a lightweight alloy and having a U-shaped cross-section that opens downward. 6 is a pipe fixed to the lower surface of the arm 5 surrounded by the U-shape. The arm 5 extends in parallel with the present direction and protrudes from the other end side of the arm 5, and the tip is bent downward to face the surface of the drum 1 shown in FIG. 3 in the normal direction. .. 7 is an adjusting screw fixed to one end side of the arm 5 and extending parallel to the extending direction of the arm 5, and 8 is a counterweight that is screwed into the adjusting screw 7 and is rotated to move along the adjusting screw 7. Is.

Reference numeral 9 is a pivot fixed to the arm 5, 10 is a bearing of the pivot 9, and 11 is a support fitting for supporting the bearing 10. Reference numeral 12 denotes a mounting hole for mounting the support tool 11 on the rotary shaft 3 of the galvanometer 2 shown in FIG. 3, and 13 denotes a mounting screw for fastening the support bracket 11 to the rotary shaft 3. Is. Reference numeral 14a denotes a needle for scratching the soot of the recording paper wound around the drum 1 shown in FIG. 3, and 14b is interposed between the needle 14a and the pipe 6, and is accommodated while the tip of the needle 14a is protruded. The holder is fixed to the tip of the pipe 6, and the tip of the needle 14a supported by the pipe 6 by the holder 14b is in contact with the recording paper wound around the drum 1.

In the recording pen 4 configured as described above, the mounting hole 12 provided in the support fitting 11 is fitted into the rotary shaft 3 of the galvanometer 2, and is fastened to the rotary shaft 3 by the mounting screw 13. The measurement information such as the earthquake, wind pressure, and atmospheric pressure converted into an electric signal is sent to the galvanometer 2, and the electric signal is converted into a physical quantity and the rotating shaft 3 rotates, so that the other end of the arm 5 moves. It is shaken above the drum 1 in the horizontal direction with respect to the surface of the drum 1. As a result, the arm 5 is swung about the rotary shaft 3 as a fulcrum, and the needle 1 is moved in the left-right direction with respect to the moving direction of the recording paper by rotating the drum 1 around which the recording paper is wound in the direction of arrow A. While the 4a moves, it scratches the soot on the recording paper and automatically records the fine measurement results.

[0007]

[Problems to be solved by the device]

 However, in the above-described conventional recording pen structure, since the holder 14b for fixing the needle 14a to the pipe 6 is attached, the recording pen 4 is not supported by the rotary shaft 3 that serves as a fulcrum when the arm 5 swings. The mass of the holder 14b is added to the distant position, and the moment of inertia of the rotating body is proportional to the square of the distance. Therefore, the moment of inertia of the recording pen increases. As a result, there is a problem that the frequency characteristic of the recorder deteriorates in a high frequency range. Further, as shown in FIG. 5 (a), since the needle 14a is fixed to the tip of the pipe 6 with the holder 14b interposed, the height from the upper surface of the arm 5 to the tip of the needle 14a becomes high. .. Here, when the recording pen 4 is swung to the left or right about the rotation axis 3 as a fulcrum, the tip of the needle 14a is in contact with the recording paper, so that a frictional force is generated between the needle 14a and the recording paper.

Therefore, when the height from the upper surface of the arm 5 to the tip of the needle 14a is high, twisting occurs at this portion, and the movement amount x of the tip of the needle 14a in the horizontal direction and the movement amount x ₁ on the upper surface side of the arm 5 are set. However, there is a problem that accurate measurement results cannot be obtained. The present invention has been made to solve the above-mentioned problems, and reduces the mass of the recording pen at a position away from the fulcrum when the arm swings to reduce the moment of inertia and improve the frequency characteristic. By lowering the height from the tip of the needle to the upper surface of the arm, twisting of this part is suppressed when the arm is swung left and right, and the amount of movement of the needle tip in the horizontal direction and the movement of the upper surface of the arm It is an object of the present invention to provide a recording pen that can make accurate recording by matching the amounts.

[0009]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is directed to a horizontal direction that intersects the moving direction of the recording paper with respect to the surface of a cylindrical drum that is wound around the recording paper for one round and rotates at a constant speed. In the soot-writing recording pen structure in which the tip moves to the recording paper and scratches the soot that adheres to the recording paper and records minute measurement information as the horizontal movement amount, the needle is resistant to It is made of a material that has abrasion resistance and corrosion resistance, and has one end as a fulcrum and the other end attached to the other end of an arm that swings horizontally above the drum in the horizontal direction with respect to the drum surface, and the tip end of the drum. The needle is directly fitted to a pipe that is provided so as to face the surface in the normal direction.

[0010]

[Action]

 In the present invention having the above-mentioned configuration, the outer shape of the needle is fitted so that it fits into the gap at the tip of the pipe attached to the other end of the arm so that the tip faces the surface of the drum in the normal direction. By forming the needle and inserting it directly into this space without interposing a holder and fixing it with an adhesive or the like, the height from the tip of the needle to the upper surface of the arm is suppressed. The height from the tip of the needle to the upper surface of the arm should be adjusted to 4 mm or less.

[0011]

【Example】

 Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a perspective view showing the structure of a recording pen according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, FIG. 2 (a) is a front view, and FIG. 2 (b) is a side view. There is. Note that the overall structure of the recording instrument is the same as that of FIG. 3 described in the prior art, and therefore its detailed description is omitted here. In FIGS. 1 and 2, 5 is an arm made of a lightweight alloy and having a U-shaped cross section, and 6 is fixed to the lower surface of the arm 5 surrounded by the U-shape. The pipe extends in parallel with the extending direction of the arm 5 and projects from the other end of the arm 5, and the tip is bent downward to be normal to the surface of the drum 1 shown in FIG. Opposite in direction.

7 is an adjusting screw fixed to one end side of the arm 5 and extending parallel to the extending direction of the arm 5, and 8 is screwed into the adjusting screw 7 and rotated to move along the adjusting screw 7. It is the counter weight to do. Reference numeral 9 is a pivot fixed to the arm 5, 10 is a bearing of the pivot 9, and 11 is a support fitting for supporting the bearing 10. Reference numeral 12 denotes a mounting hole for mounting the support tool 11 on the rotary shaft 3 of the galvanometer 2 shown in FIG. 3, and 13 denotes a mounting screw for fastening the support bracket 11 to the rotary shaft 3. Is.

Reference numeral 15 is a needle for scratching the soot of the recording paper wound around the drum 1 shown in FIG. 3, and 16 is a gap formed at the tip of the pipe 6, and the tip is wound around the drum 1 in this gap 16. The needle 15 is fitted so as to come into contact with the recording paper. The needle 15 is made of a material having excellent wear resistance and corrosion resistance, such as diamond or sapphire, and has a diameter approximately the same as the inner diameter of the gap 16 at the tip of the pipe 6 so that it can be fitted into the gap 16 of the pipe 6. To form. Then, the needle 15 is inserted into the space 16 of the pipe 6 and fixed by an adhesive or the like.

Here, when inserting the needle 15 into the space 16 of the pipe 6, the height from the tip of the needle 15 to the upper surface of the arm 5 is adjusted to be 4 mm or less, and the needle 15 is fixed to the pipe 6. To wear. The height from the tip of the needle 15 to the upper surface of the arm 5 is a value confirmed by experiments. As described above, by suppressing the height from the tip of the needle 15 to the upper surface of the arm 5 to 4 mm or less, the twisting of this portion when the recording pen 4 is swung to the left or right with the rotation shaft 3 as a fulcrum is ignored. It can be considered that the movement amount x of the tip of the needle 15 in the horizontal direction with respect to the surface of the drum 1 and the movement amount x ₁ of the upper surface side of the arm 5 are equal to each other.

[0015]

[Effect of the device]

 As described above, according to the present invention, the recording paper to which the soot is attached is wound around one round, and the surface of the cylindrical drum that rotates at a constant speed is placed in the horizontal direction intersecting the moving direction of the recording paper. In the soot writing recording pen structure that moves and scratches the soot that the tip contacts the recording paper and adheres to it, in the soot writing recording pen structure, the needle is abraded. It is made of a material that has wear resistance and corrosion resistance, and one end is attached to the other end side of the arm that swings horizontally with respect to the drum surface above the drum with one end as a fulcrum, and the tip end with respect to the drum surface. The needle is directly fitted to the pipes provided so as to face each other in the normal direction.

Therefore, the mass of the recording pen at the position away from the fulcrum when the arm swings is reduced by the holder, and the moment of inertia is reduced, so that the frequency characteristic in the high range is improved. Also, since the height from the tip of the needle to the upper surface of the arm is low, the twisting of this part when the recording pen swings can be suppressed to a negligible level, and the amount of movement of the needle tip in the horizontal direction with respect to the drum surface is reduced. The movement amount on the upper surface side of the arm supporting the needle can be regarded as the same, and the measurement result can always be recorded accurately. Further, since the needle is directly fixed to the pipe without the holder interposed, the number of parts for the holder can be reduced and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a recording pen according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is an explanatory diagram showing a schematic configuration of a recording instrument such as a seismograph.

FIG. 4 is a perspective view showing a conventional recording pen.

FIG. 5 is a sectional view of a main part of a conventional recording pen.

[Explanation of symbols]

 1 Drum 2 Galvanometer 3 Rotating Shaft 4 Recording Pen 5 Arm 6 Pipe 15 Needle 16 Void

Claims (1)

[Scope of utility model registration request] 1. A recording paper sheet with soot attached is wound one round,
With respect to the surface of the cylindrical drum that rotates at a constant speed, a needle that moves in the horizontal direction intersecting the moving direction of the recording paper and scratches the soot that is attached when the leading edge contacts the recording paper is provided. In a soot writing recording pen structure for recording measurement information as the amount of horizontal movement, the needle is formed of a material having abrasion resistance and corrosion resistance, and one end is a fulcrum and the other end is a drum above the drum. The needle is directly fitted to a pipe that is attached to the other end of an arm that swings in the horizontal direction with respect to the surface, and the tip is provided so as to face the surface of the drum in the normal direction. Soot writing pen structure.