JP3190906B2 - Tension gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable tension gauge used for measuring the tension of a drive timing belt or the like used in a power transmission mechanism of a small and compact precision machine or the like.

[0002]

2. Description of the Related Art Conventionally, a portable belt tension gauge for measuring the tension of a timing belt, a V-belt, or the like, has a measuring rod pressed vertically against a belt stretched between two pulleys or a spring. The amount of displacement (bending amount) is given to the belt by hooking the belt like a scale and pulling vertically, and the load amount when the belt moves by an arbitrary amount of displacement is read on a scale to measure the tension.

In the conventional tension measurement, since the displacement amount is not constant and varies depending on the measurer, there is a problem that an accurate measured tension value cannot be obtained. In order to solve this problem, for example, as shown in Japanese Utility Model Application Laid-Open No. 2-39137, when the pressing rod of the tension gauge is pressed against the belt, the moving distance is regulated so that the displacement amount generated in the belt becomes a predetermined amount. There has been proposed a tension gauge that has a stopper that eliminates variations in displacement by a measurer.

[0005] That is, as shown in the configuration diagram of FIG. 5, a bar 37 is placed on a belt 33 supported by rotating bodies 31 and 32 and tensioned by a tension roller 34.
The guide hole 38 provided in the bar 37 is positioned substantially at the center of the interval between the rotating bodies 31 and 32, and the pressing rod 36 of the tension gauge 35 is inserted into the guide hole 38. Then, the belt 33 is pressed by the pressing rod 36, and the load scale when the amount of displacement of the belt 33 is regulated by the stopper member 39 attached to the bar 37 is read to obtain the belt tension value at the predetermined amount of displacement. Like that.

[0005]

However, the above-described conventional tension measuring method has the following problems. First, a bar circumscribing the interval between a pair of rotating bodies that support the timing belt and the like, and a stopper member that is attached to the bar and determines a predetermined displacement amount is required. Next, if the interval between the pair of rotating bodies supporting the timing belt or the like is too long or too short, or if the measurement place is too narrow, the measurement cannot be performed using the bar. Further, since the tension measurement direction can be measured only in the direction in which the belt is pushed, and cannot be measured in the pulling direction, it is difficult to displace in the pushing direction in a small and compact device due to a narrow environment and structural features. That is, it is not possible to measure the tension of a timing belt, a wire, or the like. SUMMARY OF THE INVENTION It is an object of the present invention to provide a tension gauge that solves these problems and eliminates variations in the amount of displacement by a measurer.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a portable tension gauge used for measuring the tension of a timing bell or the like as an object to be measured. the extending-contracting is operated to push and pull direction also a displacement mode for measuring the displacement of the object to be measured
Is a load mode that measures the load of the object to be measured.
A measuring rod for performing measurement in a mode, a main body including a driving mechanism having the measuring rod and operating the measuring rod and a circuit means for controlling the driving mechanism;
A tension gauge having a hand grip attached to the main body and holding the main body .

[0007] That is, the measuring rod is moved by the combination of the two measuring modes and the directions of extension and contraction.
Measurement in two measurement modes is possible.

Further, the present invention provides a measurement mode changeover switch for switching the four measurement modes in a main body,
In addition, when measuring in the displacement mode, a load set for setting a load amount is attached to the hand grip, and when measuring in the load mode, a push button for setting the displacement amount is attached to the main body , ,Previous
The tip of the measuring rod is provided with a hook member for pressing and pulling against the object to be measured.

Further, according to the present invention, when the measurement mode is the displacement mode, the set load amount is displayed and the measured displacement amount when the measuring rod moves to reach the set load amount is set to the set load amount. In addition, when the measurement mode is the load mode, the set displacement is displayed, and the measured load when the measuring rod moves to reach the set displacement is displayed in accordance with the set displacement. Digital display on main unit
Characterized by comprising.

[0010]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of the tension gauge of the present invention.

As shown in FIG. 1, one embodiment of the present invention is a measuring rod 1 movable in an elongating direction 10 (a direction in which a belt is pushed) and a contracting direction 11 (a direction in which a belt is pulled).
A main body 2 having a function of measuring the amount of displacement of the measuring rod 1 in the direction of extension and contraction and the amount of load required for the movement, and a function of controlling the extension and contraction of the measuring rod 1 by electric signals. The main unit 2 includes a measurement mode changeover switch 3 for switching four measurement modes, a power switch 4, an operation switch 5 for starting / stopping measurement, and a digital display for displaying measurement results, as described later. 6 is provided.

The measuring rod 1 is connected to a driving device (not shown) such as a motor incorporated in the main body 2 so as to be able to reciprocate, and a measuring portion protruding from one end of the main body 2 is extended and contracted. It has a structure to do. The portion of the tip of the measuring rod 1 that comes into contact with the measured object 12 is
An L-shaped or U-shaped hook member 13 is attached so that the push-pull 2 can be pushed and pulled.

The hand grip 7 which can be held by one hand at the time of measurement is provided with a load set 8 which can arbitrarily set a load required for moving the measuring rod 1 to expand and contract. The load set 8 has a rotary scale, and a load amount can be set on the scale like a torque wrench. Further, the main body 2 is provided with a push button 21 for arbitrarily setting the amount of displacement of the extension and contraction of the measuring rod 1. For example, if the set value is changed by 1 mm each time it is pressed once, By pressing the button an arbitrary number of times, the displacement can be set in units of millimeters.

In order to perform more accurate tension measurement, one end of the main body 2 on the side where the measuring rod 1 protrudes is provided.
A mounting bracket 9 for fixing the device to be measured to an apparatus or the like so that the measurement can be performed without holding the main body 2 by hand.
Is provided. The mounting bracket 9 is made of various exchangeable plate members such as a T-shaped or circular shape, and by providing a plurality of holes, a casing or cover of a precision machine or the like in which a timing belt or the like is incorporated, or It can be fixed to the frame with screws.

Next, a circuit configuration of an embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing the circuit configuration. First, one of the four measurement modes is selected by the measurement mode changeover switch 3, and the start of measurement is transmitted to the control circuit 19 by the operation switch 5, and the operation control required for the measurement is started.

The movement of the measuring rod 1 in the extension direction 10 or the contraction direction 11 is controlled by a drive circuit 16. The setting and detection of the amount of displacement of the measuring rod 1 are performed by a displacement detector 14, converted into an electric signal by a displacement signal converter 17,
It is sent to the control circuit 19. The setting and detection of the load amount when the measuring rod 1 is moved is performed by the load application detection circuit 15, converted into an electric signal by the load signal converter 18, and sent to the control circuit 19.

As a result of the measurement, electric signals of the displacement signal converter 17 and the load signal converter 18 are sent to the digital display 6 via the control circuit 19 and displayed. Power supply unit 20
Has a power supply function as a battery or an external power supply necessary for various circuit operations of the main body 2.

Next, the operation of one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 is an explanatory diagram of a measurement mode in one embodiment. There are two types of measurement modes in the present invention. One is a displacement that measures the displacement amount when the measuring rod moves under the set load, and digitally displays the set load amount and the measured rod displacement amount of the measurement result. In mode A, the other is to set the displacement amount of the measuring rod arbitrarily, measure the load amount required for the measuring rod to move to the set displacement amount, and measure the arbitrary set displacement amount and the measurement result. This is a load mode B for digitally displaying the load amount of the bar. Four types of measurement modes can be selected by combining the two types of modes A and B and the moving direction (extending direction, contracting direction) of the measuring rod.

Next, the operation of the embodiment will be described more specifically with reference to FIGS. Here, FIG.
FIG. 4 is a configuration diagram showing a tension measuring method when a belt is pulled. First, the DUT 1 supported between a pair of rotating bodies
A hook member 13 at the tip of the measuring rod 1 is brought into contact with a substantially intermediate portion of the timing bar 2 (such as a timing belt), and the handgrip 7 is held so that the measuring rod 1 is vertically contacted. At this time, besides fixing by hand, if it is used by fixing it to a frame or the like of a device in which an object to be measured is incorporated using the mounting bracket 9, more accurate tension measurement can be performed than by fixing by hand.

Next, the power switch 4 is turned on, and the measurement mode is selected by the measurement mode switch 3. First,
When the extension direction of the displacement mode is selected by the measurement mode changeover switch 3 (FIG. 1), the required load amount when the measuring rod 1 is moved is set by the load set 8, and the operation switch 5 is pushed to extend the measuring rod 1. Move in the direction 10. The measuring rod 1 elongates at a fixed speed with a set load, pushes and moves the DUT 12, and stops moving when the set load amount is reached. At this time, the digital display 6 displays the distance D1 (displacement amount) by which the measuring rod 1 has moved and the preset load amount.

On the other hand, when the contraction direction of the displacement mode is selected by the measurement mode switch 3 (FIG. 4), the measurement rod 1
Moves in the contraction direction 11 and pulls the object 12 to be measured, and the movement of the measuring rod 1 stops when the set load amount is reached. At this time, the set load amount set in advance and the distance D2 (displacement amount) that the measuring rod 1 has moved are displayed on the digital display 6.
Is displayed in.

Next, when the elongation direction of the load mode is selected by the measurement mode changeover switch 3 (FIG. 1), the displacement D1 of the measurement rod 1 is set by the push button 21, and the operation switch 5 is pressed to set the measurement rod 1 Is moved in the extension direction 10. The measuring rod 1 pushes and moves the object 12 until the set displacement is reached, and stops when the set displacement D1 is reached. At this time, the load amount detected by the measuring rod 1 and the preset displacement amount D1 are displayed on the digital display 6.

When the contraction direction of the load mode is selected by the measurement mode changeover switch 3 (FIG. 4), the measurement rod 1
Moves in the contraction direction 11 and pulls the object 12 to be measured, and stops when the set amount of displacement D2 is reached. At this time,
The load amount detected by the measuring rod 1 and the preset displacement amount D2 set in advance are displayed on the digital display 6.

As described above, according to the present embodiment, the tension measurement can be performed by switching the four measurement modes by combining the two measurement modes and the moving direction (extension direction, contraction direction) of the measurement rod. It is widely applicable to tension measurement of timing belts for driving precision machinery, etc., and can be easily measured. As described above, the present invention has been described assuming a small precision machine or the like, but it is of course possible to apply the present invention to a large device.

[0025]

According to the present invention, the main body of the measuring instrument is manually held or fixed to a frame or the like of an apparatus in which the object to be measured is incorporated, and the displacement of the measuring rod moved under the set load. The amount of load or the amount of load required for the measuring rod to move to the set amount of displacement can be measured. Now you can easily measure.

Therefore, the variation in the measured value, which has conventionally occurred because the load applied to the measuring rod is not constant by the operator, is eliminated, and a stopper member for defining the amount of displacement is not required. The effect is obtained that the measurement can be performed even with a narrow device, and the measurement in the pulling direction as well as the pushing direction can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a circuit configuration according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a measurement mode in one embodiment of the present invention.

FIG. 4 is a configuration diagram showing an operation in one embodiment of the present invention.

FIG. 5 is a configuration diagram showing a conventional measurement method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measuring rod 2 Body part 3 Measurement mode changeover switch 4 Power switch 5 Operation switch 6 Digital display 7 Hand grip 8 Load set 9 Mounting bracket 10 Extension direction 11 Contraction direction 12 DUT 13 Hook member 14 Displacement detector 15 Load application Detection circuit 16 Drive circuit 17 Displacement signal converter 18 Load signal converter 19 Control circuit 20 Power supply unit 21 Push button 31, 32 Rotating body 33 Belt 34 Tension roller 35 Tension gauge 36 Press rod 37 Bar 38 Guide hole 39 Stopper member

Claims (6)

(57) [Claims] 1. A portable tension gauge used for measuring a tension of a timing bell or the like as an object to be measured,
The tip is brought into contact with the object to be measured, and the object is pressed and pressed.
The object to be measured is displaced by extending and contracting in the tensile direction.
Displacement mode for measuring the load or measuring the load on the object to be measured
Measurement in two load modes
A measuring rod for mounting the measuring rod, a driving mechanism for operating the measuring rod and a circuit means for controlling the driving mechanism; and a main body attached to the main body.
A tension gauge having a hand grip for holding a main body . Wherein said measuring rods claims, characterized in that said by the combination of the two measurement mode and the elongation-contraction direction, it can be measured by four measurement modes
The tension gauge according to 1 . 3. A main body section having a measurement mode changeover switch for switching between the four measurement modes.
The tension gauge according to claim 2 . 4. A load set for setting a load amount is attached to a hand grip at the time of measurement in the displacement mode, and a push button for setting a displacement amount is provided on the main body portion at the time of measurement in the load mode. The tension gauge according to claim 1 , wherein the tension gauge is attached. 5. The tension gauge according to claim 1, wherein a hook member is provided at a tip portion of the measuring rod so as to contact and press and pull the object to be measured. 6. When the measurement mode is the displacement mode, a set load amount is displayed, and a measured displacement amount when the measuring rod moves and reaches the set load amount is displayed in accordance with the set load amount. When the measurement mode is the overload mode, a digital display that displays a set displacement amount and displays a measured load amount when the measuring rod moves to reach the set displacement amount in accordance with the set displacement amount. The tension gauge according to claim 1 , wherein the tension gauge is provided on a main body.