JP4500587B2 - Roller encoder - Google Patents

Description

  The present invention relates to a roller encoder used for measuring the speed and length of a traveling body.

  For example, a roller encoder having a structure shown in FIG. 3a is known as a roller encoder used for measuring the speed and length of a production line such as a belt conveyor and a traveling body such as a long object such as paper or film. . 3a1 is a left side view of the roller encoder, FIG. 3a2 is a front view of the roller encoder, and FIG. 3a3 is a right side view of the roller encoder.

  As shown in the figure, this roller encoder mainly fixes a handle 300 to a measurement unit including a rotary encoder 100 and a roller 200 fixed to a rotary shaft of the rotary encoder 100, and the handle 300 is fixed to the rotary encoder 100. It has the structure added by.

In such a configuration, for example, as shown in FIG. 3B, the roller encoder uses the attachment hole 301 to attach the upper portion of the handle 300 so that the roller 200 is placed on the traveling body 400 so as to be movable up and down. It is used in a state where it is swingably supported. Then, the rotary encoder 100 detects the rotation amount and rotation speed of the roller 200 as the traveling body travels.
JP 2001-208507 A Japanese Utility Model Publication No. 2-105114

  In the conventional roller encoder shown in FIG. 3A, the position where the handle 300 is supported, that is, the position of the mounting hole 301 is not the position above the roller 200 in the front view shown in FIG. 3A2. In addition, the position of the mounting hole 301 is shifted from the center of gravity position 150 of the measurement unit composed of the rotary encoder 100 and the roller 200.

For this reason, when used in the form shown in FIG. 3b, a moment in the direction shown by the arrow in FIG. 3a2 acts. Further, due to the displacement of the vertical mounting hole 301 in the front view of FIG. 3 a 2 from the roller 200, the force due to rolling resistance between the traveling body acting on the roller 200 acts as a moment for tilting the roller 200. . Due to these reasons, the roller 200 may meander or tilt, and the measurement accuracy may be deteriorated.
Therefore, an object of the present invention is to provide a roller encoder that can perform measurement with higher accuracy.

  In a roller encoder including a rotary encoder and a measurement unit including a roller fixed to a rotary shaft of the rotary encoder, and a handle fixed to the rotary encoder, the center of gravity of the measurement unit is determined from a direction perpendicular to the rotation axis of the roller. An attachment portion for attaching the handle to a support body supporting the roller encoder, which is set at a position overlapping with the roller when viewed, is provided in the direction perpendicular to the rotation axis of the roller. The handle is configured to be positioned on a line extending from the center of gravity.

  By configuring in this way, when used in the form shown in FIG. 3b, it is possible to prevent the moment in the direction of tilting the roller from acting due to the weight of the measuring unit and to improve the accuracy of the measurement. it can. Further, it is possible to smooth the force that acts on the roller encoder from the traveling body and tilts the roller about the handle mounting portion.

Further, according to one aspect of the present invention, the center of gravity of the measurement unit mounted on the roller is viewed from a direction perpendicular to the rotation axis of the roller. Thus, weights are provided for overlapping the rollers.
By doing so, the center of gravity of the measurement unit can be set appropriately regardless of the weight ratio between the rotary encoder and the roller.
Here, it is preferable that the center of gravity of the measurement unit is positioned on the rotation axis of the roller. In addition, the weight is adjusted so that the center of gravity of the measuring portion is in the center with respect to the rotation axis direction of the roller. It is more preferable for smoothing the force in the direction of tilting the roller.

  As described above, according to the present invention, it is possible to provide a roller encoder that can perform measurement with higher accuracy.

Hereinafter, embodiments of the present invention will be described.
First, a first embodiment of the present invention will be described.
FIG. 1 shows the structure of the roller encoder according to the first embodiment. Here, FIG. A is a left side view of the roller encoder, FIG. B is a front view of the roller encoder, and FIG. C is a right side view of the roller encoder. FIG. D is an exploded view of the roller encoder schematically shown.
As shown in the figure, this roller encoder has a configuration in which a handle 3 is added to a measuring section mainly composed of a rotary encoder 1 and a roller 2 fixed to the rotary shaft of the rotary encoder 1. The rotary encoder 1 is fixed to the handle 3 with a screw 12 in a form in which the rotary shaft 11 is passed through a hole 33 provided in the handle 3. Further, the roller 2 is fixed to the rotating shaft 11 that penetrates the handle 3 of the rotary encoder 1.

  Further, a metal weight 21 is embedded in the roller 2 as a counterbalance with respect to the rotary encoder 1, and the weight 21 causes the center of gravity 15 of the measuring portion made up of the rotary encoder 1 and the roller 2 to be the rotation axis of the roller 2. It is set to be a position inside the upper roller 2.

  The handle 3 with the lower part fixed to the rotary encoder 1 has a mounting hole 31 provided in the upper part of the handle 3 on the line extending from the center of gravity 15 of the measuring part in the direction perpendicular to the rotation axis in the front view of FIG. The lower part is bent toward the rotary encoder 1 so as to be positioned and offset.

In the figure, 101 is a power line and output signal line of the rotary encoder 1, and 32 is a power terminal and signal terminal of the rotary encoder 1 fixed to the handle 3. The output of the rotary encoder 1 is a pulse signal representing the rotational speed of the roller 2, for example.
The first embodiment of the present invention has been described above.
As described above, according to the first embodiment, when used in the form shown in FIG. 3b, the moment in the direction of tilting the roller 2 due to the weight of the measuring unit is suppressed and the measurement is performed. Accuracy can be improved. Further, since the center of gravity 15 of the measurement unit is positioned so as to overlap the roller 2 when viewed from the direction perpendicular to the rotation axis of the roller 2, the mounting portion of the handle 3 that acts on the roller 2 from the traveling body is used as an axis. The force in the direction of inclining the roller 2 can be smoothed, and the inclination of the roller 2 and the occurrence of meandering can be prevented. In addition, since the center of gravity 15 is set by embedding the weight 21 in the roller 2, the center of gravity 15 of the measuring unit can be appropriately set regardless of the weight ratio between the rotary encoder 1 and the roller 2.

Next, a second embodiment of the present invention will be described.
FIG. 2 shows the structure of the roller encoder according to the second embodiment. Here, FIG. A is a left side view of the roller encoder, FIG. B is a front view of the roller encoder, and FIG. C is a right side view of the roller encoder.
As shown in the figure, this roller encoder has a structure in which a handle 3 is added to a measuring unit mainly composed of a rotary encoder 1 and a roller 2 fixed to the rotary shaft of the rotary encoder 1 as in the first embodiment. have.
Similarly to the first embodiment, a metal weight 21 is embedded in the roller 2 as a counter balance with respect to the rotary encoder 1. However, in the second embodiment, the weight 21 sets the position of the center of gravity 15 of the measuring unit composed of the rotary encoder 1 and the roller 2 so as to be the center position in the rotation axis direction of the roller 2. .

  The lower part of the handle 3 is fixed to the rotary encoder 1 and the lower part of the handle 3 is positioned on a line extending from the center of gravity 15 of the measuring part in a direction perpendicular to the rotation axis. It has a shape that is bent and offset to the rotary encoder 1 side.

The second embodiment of the present invention has been described above.
As described above, according to the second embodiment, the force in the direction of tilting the roller 2 about the mounting portion of the handle 3 acting on the roller 2 from the traveling body is further smoothed, and the inclination of the roller 2 and the meandering of the roller 2 are smoothed. Generation | occurrence | production can be prevented effectively.

It is a figure which shows the structure of the roller encoder which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the roller encoder which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the conventional roller encoder.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotary encoder, 2 ... Roller, 3 ... Handle, 15 ... Center of gravity, 21 ... Weight, 31 ... Mounting hole.

Claims (4)

A roller encoder having a rotary encoder and a measurement unit including a single roller having a rotary shaft fixed to a rotary shaft of the rotary encoder, and a handle fixed to the rotary encoder;
The upper part of the handle is provided with an attachment part for attaching the handle to a support that supports the roller encoder.
The rotary encoder and the roller are arranged side by side along the rotation axis direction of the roller,
The center of gravity of the measuring portion is located at a position overlapping with the roller as viewed from the vertical direction to the rotation axis of the roller,
By connecting the lower part of the handle to the rotary encoder at a position between the rotary encoder and the roller, the handle is fixed to the rotary encoder,
The roller encoder, wherein the handle has a shape bent so that the attachment portion is positioned on a line extending from the center of gravity of the measurement portion in a direction perpendicular to the rotation axis of the roller. The roller encoder according to claim 1,
The roller encoder according to claim 1, wherein the measuring unit has a weight attached to the roller so that the center of gravity of the measuring unit overlaps with the roller when viewed from a direction perpendicular to the rotation axis of the roller. The roller encoder according to claim 2, wherein
The roller encoder according to claim 1, wherein a center of gravity of the measurement unit is on a rotation axis of the roller. The roller encoder according to claim 2 or 3,
The roller encoder according to claim 1, wherein the center of gravity of the measuring unit is located at a central position in the rotation axis direction of the roller.

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