JPH04189574A - High-speed circular motion-linear motion converter - Google Patents

Abstract

PURPOSE:To move a recording pen at a high speed to convert a rotating motion to a linear motion at a high speed by a method wherein a ball bearing disposed in a groove of a rotating drum is moved in contact with the wall of the groove of the rotating drum to obtain a structure of a small friction and a smooth movement. CONSTITUTION:A lower end part of a recording pen holder 4 is inserted into a groove 2 provided on the surface of a rotating drum and held so as to freely move in the groove 2. A ball bearing provided on the lower end of the recording pen holder 4 to ensure the movement of the holder 4 in the groove 2 with a small friction freely moves in contact with the wall of the groove 2 of the rotating drum. A bored guide plate 3 movably holds the barrel of the recording pen holder 4 in the bored hollow part thereof to guide it in parallel to the axial direction of the rotating drum. The bored guide plate 3 is fixed on the rotating drum so that the longitudinal direction of the bored hollow part coincides with the axial direction of the rotating drum. Simultaneously with the rotation of the rotating drum, the lower end of the recording pen holder 4 moves in one direction along the groove 2 through the ball bearing, whereby a circular motion is converted to a linear motion with a small friction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a high-speed circular motion linear motion conversion device, and in particular, to a recording pen recording device of a rotating drum type recording device used in a conventional fish finder. The present invention relates to a high-speed circular motion linear motion converting device that can improve the drawbacks of the mechanism and convert the circular motion of a rotating drum into high-speed linear motion. This high-speed circular motion linear motion conversion device is suitable for use in recording devices such as facsimiles and printers.

[Conventional technology]

For fish finders, a recording device that is low in cost and resistant to salt damage is desired. For this reason, rotary drum type recording apparatuses, which have a simple active mechanism and are manufactured at low cost, have been widely used. This type of rotating drum type recording device has recording paper stretched around a rotating drum.
The rotary drum rotates at a constant speed, and the recording ben swivel mechanism, which is located opposite the rotary drum, rotates the recording paper in the width direction (
By driving the recording pen in the axial direction of the rotating drum,
Performs two-dimensional recording on recording paper.

Further, as a rotating drum type recording device for such a fish finder, for example, a rotating drum type convex spiral recording device is conventionally known.

A rotating drum type convex spiral recording device has a spiral convex portion on the circumference of a rotating drum, and performs discharge recording between the fixed linear electrode and the spiral convex portion, which are installed separately facing the rotating drum, and This is a device that performs two-dimensional recording on recording paper stretched over a drum (see, for example, Japanese Patent Publication No. 34-7124 and Japanese Patent Publication No. 34-5390).

[Problem to be solved by the invention]

By the way, the above-mentioned conventional rotary drum type recording device for a fish finder requires a vibration absorbing material to be interposed between a fixed linear electrode and a rotary drum on which a recording paper is stretched.
In order to attenuate the resonance and attenuate the pruning amplitude for stable recording, a rod-shaped guide is required for the fixed linear electrode. Furthermore, when the rotating drum is rotated at high speed and recorded, resonance occurs between the rotating drum and the recording pen active mechanism.
Furthermore, there is a problem in that pruning motion occurs and the recording operation of the recording pen lacks high-speed stability. Note that this requires the recording paper to be stretched over a rotating drum.

There is also the problem that handling is troublesome.

The present invention has been made to solve these problems.

An object of the present invention is to improve the drawbacks of the recording pen drive mechanism of a rotary drum type recording device, to convert the circular motion of the rotary drum into linear motion at high speed, and to make it suitable for use in the recording device. An object of the present invention is to provide a high-speed circular motion to linear motion conversion device.

[Means to solve the problem]

In order to achieve the above object, the high-speed circular motion linear motion converting device of the present invention connects the U-driving motor shaft and the rotating drum shaft through a power transmission mechanism to rotate the rotating drum and convert the circular motion of the rotating drum. This is a high-speed circular motion linear motion conversion device that converts linear motion in the axial direction of a rotating drum to move a recording pen holder, and the peripheral surface of the rotating drum is A groove is provided on the surface of the rotating drum that takes the shape of one cycle of a sine wave on the unfolded surface when unfolded, and a ball bearing is provided in the groove, and the ball bearing moves in contact with the wall of the groove of the rotating drum. A recording pen holder is movably provided, and an inner guide plate is fixed to the rotating drum and movably holds the recording pen holder in an inner wall portion and guides the recording pen holder in parallel to the axial direction of the rotating drum. It is characterized by having

[Effect]

In this high-speed circular motion linear motion conversion device, the rotating drum has an axial length exceeding the moving linear distance,
Grooves are provided on the surface of the rotating drum so that when the peripheral surface of the rotating drum is developed, the developed surface has a shape of one cycle of a sine wave. A recording pen holder having a ball bearing and moving in contact with the wall of the groove of the rotating drum is movably provided in the groove of the rotating drum. In addition, the middle guide plate is fixedly arranged with respect to the rotating drum, and the recording pen holder is movably held in the middle part of the middle guide plate, so that the recording pen holder is moved in the axial direction of the rotating drum. Guide parallel to.

The ball bearing portion integrally fixed to the recording pen holder is fitted into a groove provided in the rotating drum, and the ball bearing moves in contact with the wall of the groove of the rotating drum. Thereby, the rotational motion of the rotating drum is converted into a linear motion that moves the recording pen holder in the axial direction of the rotating drum,
Move the recording pen holder. In this case, the ball bearing located in the groove of the rotating drum moves in contact with the wall of the groove of the rotating drum, so the movement is smooth with little friction. Therefore, high-speed movement is possible, and rotational motion can be converted into linear motion at high speed.

When a high-speed circular motion to linear motion conversion device having such a configuration is applied to a recording device, a recording pen is held in a recording pen holder, and recording is performed on a recording paper placed at a position facing the recording pen. Move the recording paper sequentially to the position where recording ended, and
Perform dimensional recording. That is, the high-speed circular motion/linear motion conversion device here converts circular motion into linear motion based on the principle of converting circular motion into linear motion in a rotating drum type recording device. When used in a recording apparatus that performs two-dimensional recording, a recording pen is held in a recording pen holder on the rotating drum side, and recording is performed on the opposing recording paper side.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described using the drawings.

FIG. 1 is a perspective view showing the structure of a mechanical section of a high-speed circular motion linear motion conversion device according to an embodiment of the present invention. 1st
In the figure, 1 is a rotating drum, 2 is a groove provided on the surface of the rotating drum, 3 is a guide plate, and 4 is a recording pen holder. Further, 5 is a power transmission mechanism coupled to the shaft of the rotating drum.

Although not shown here, the power transmission mechanism 5 is coupled to a single-acting electric motor.

The lower end of a recording pen holder 4 is fitted into a groove 2 provided on the surface of the rotating drum 1.
is held movably with its lower end inserted into the groove 2. As will be described later, the lower end of the recording pen holder 4 is provided with a ball bearing so that it can move within the groove 2 with less friction. Move freely. Further, the inner guide plate 3 functions to movably hold the shaft portion of the recording pen holder 4 in the hollow inner portion and guide it in parallel to the axial direction of the rotary drum 1. The inner guide plate 3 is fixedly disposed with respect to the rotary drum 1 such that the longitudinal direction of the hollow inner circumferential portion is located in the axial direction of the rotary drum 1.

FIG. 2 is a diagram illustrating the operating principle of circular motion to linear motion conversion by developing the peripheral surface of a one-rotation drum and showing it as a developed plane.

The groove shape 22 on the surface of the rotary drum of the groove 2 provided on the surface 21 of the peripheral surface of the rotary drum 1 is formed so that when the peripheral surface of the rotary drum is developed, it has a shape of one cycle of a sine wave on the developed surface. has been done. In the rotary drum 1, the groove shape 22 of one period of the sine wave here also has an elliptical shape along the circumference of the cut when the cylindrical rotary drum 1 is cut diagonally at a predetermined angle in the axial direction. ing.

The lower end portion of the recording pen holder 4 is fitted into the groove 2 having the shape thus formed, and is held movably along the groove 2. Further, the shaft portion of the recording pen holder 4 is movably held in a hollow inner portion by the inner guide plate 3, and is parallel to the axial direction of the rotating drum 1. You will be guided. Thereby, the rotational movement of the rotary drum 1 converts the recording pen holder 4 into a linear movement that moves along the hollow inner part of the inner guide plate 3.

3 and 4 are a plan view and a front view showing the structure of the recording pen holder.

As shown in the figure, the recording pen holder 4 has a lower end made up of a ball bearing 6 and a ball bearing holding member 8, and an upper part of the ball bearing holding member 8.
A shaft portion 7 that holds the recording pen is fixed. The lower end of the recording pen holder 4 configured as described above enters the recessed portion of the groove 2 provided in the rotating drum, and moves in contact with the wall surface of the groove 2 via the ball bearing 6. Therefore, there is less friction due to the rolling of the ball bearing 6, and smooth movement is possible even at high speeds.

Next, the operation will be explained with reference to FIGS. 1 and 2.

The rotation of the rotary drum 1 is either leftward rotation or rightward rotation depending on the power supply polarity of the opening motor. Normally, it should rotate to the left. Due to the leftward rotation of the rotating drum, the lower end of the recording pen holder 4 fitted into the groove 2 provided on the surface of the rotating drum smoothly moves within the groove 2 via the ball bearing 6, and 2 along the sinusoidal groove shape 22 A → D → B-4C → A
and move. When the rotation of the rotary drum 1 is in the opposite direction, A-)C-+B→D- is rotated along the groove shape 22 in the opposite direction.
) Move with A. Correspondingly, the shaft portion of the recording pen holder 4 extends along the hollow inner portion of the inner guide plate 3 at A′.
→ B' → A' and repeat the reciprocating movement in a straight line. Thereby, the rotational motion of the rotary drum 1 is converted into linear motion.

The recording pen tip 10 fixed to the shaft of the recording pen holder 4 moves from the left end to the right end (A''→B'') on the recording paper 11, or conversely from the right end to the left end. (B"→A") and moves back and forth in a straight line. When this recording pen tip 10 moves back and forth, A'→B" or B'→A
By applying a recording signal to the recording pen tip 10 during the movement, recording is performed on the recording paper 11.

As the rotary drum 1 rotates in this way, the recording pen tip 10 moves linearly back and forth, and recording is performed. The principle by which the recording pen tip 10 moves back and forth is as follows.
The recording pen is held as the rotary drum 1 rotates due to the contact angle between the inner wall of the groove 2 of the rotary drum 1 and the pole bearing 6, and the contact between the shaft portion of the recording pen holder and the hollow inner portion of the inner guide plate 3. Since the lower end of the tool 4 simultaneously moves in one direction via the pole bearing 6 along the groove 2, the conversion from circular motion to linear motion is performed with less friction, resulting in high-speed circular motion. It is possible to convert motion to linear motion.゛In addition, when installing the middle guide plate 3 parallel to the axial direction of the rotating drum 1, carbon and springs are inserted between it and the rotating drum 1 and fixed in close contact so that the middle guide plate 3 does not vibrate. Fix it like this.

By the way, in FIG. 2, as shown by the imaginary two-dot chain line, a second inner guide plate 33 and a second recording pen holder 34 are further provided, and the inner guide plate and the recording pen holder are provided separately. The second recording pen holder 34 is positioned in the hollow part of the second inner guide plate 33, and the shaft portion of the second recording pen holder 34 is inserted into the second inner guide plate 33. It is configured to be movably held in a hollow inner part and guided in parallel to the axial direction of the rotating drum 1. This allows a configuration in which a plurality of recording pen nibs 10.30 having a predetermined phase difference are provided. When used in a recording device, the plurality of recording pen nibs 10.30 can be used to record signals obtained from, for example, a fish finder, thereby recording a signal having a predetermined phase difference based on the physical positional relationship. It is possible to perform recording that can express the time delay and advance of the signal.

The present invention has been specifically explained above based on examples, but
It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

〔Effect of the invention〕

As explained above, the high-speed circular motion linear motion conversion device according to the present invention has a mechanically simple structure, and the ball bearing located in the groove of the rotating drum is in contact with the wall of the groove of the rotating drum. Since it is a movable structure, it has a structure that moves smoothly with little friction. Therefore, high-speed movement is possible, and rotational motion can be converted into linear motion at high speed. By using this high-speed circular motion linear motion conversion device as a recording device for a fish finder, an inexpensive and highly reliable fish finder can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a mechanical section of a high-speed circular motion linear motion conversion device according to an embodiment of the present invention. FIG. 3 and 4 are a plan view and a front view showing the structure of the recording pen holder. In the figure, 1. Rotating drum, 2. Groove, 3. Middle gate guide plate, 4. Recording pen holder, 5. Power transmission mechanism, 6.
...Ball bearing, 7...Shaft part, 8 Pole bearing holding member, 1o...Recording pen tip, 11...Recording paper, 21...Rotating drum surface, 22.Groove shape, 30
...Second recording pen nib, 33...Second middle guide plate,
34...Second recording pen holder.

Claims (1)

[Claims] 1. The driving electric motor shaft and rotating drum shaft are connected by a power transmission mechanism to rotate the rotating drum, converting the circular motion of the rotating drum into linear motion in the axial direction of the rotating drum, and moving the recording pen holder. A high-speed circular motion linear motion conversion device, which rotates a groove on a rotating drum whose axial length exceeds a linear movement distance, which has a shape of one cycle of a sine wave on the developed surface when the peripheral surface of the rotating drum is developed. A movable recording pen holder is provided on the surface of the drum and has a ball bearing in the groove, and the ball bearing moves in contact with the wall of the groove of the rotating drum. 1. A high-speed circular motion linear motion conversion device, characterized in that a middle guide plate is fixedly disposed on the rotating drum and is movably held in the rotating drum and guided in parallel to the axial direction of the rotating drum.