Tension measurement device

1. A tension measurement device comprising:

a pair of rotatable first support rollers;

a pressing portion arranged to face a midpoint between the pair of first support rollers;

a pair of rotatable second support rollers arranged to face the pair of rotatable first support rollers; and

a load cell capable of measuring a load applied to the pressing portion,

the tension measurement device being capable of measuring a tension of a measurement target by clamping the measurement target between the pair of rotatable first support rollers and the pressing portion, wherein

on a same side of the measurement target as the pair of rotatable first support rollers, the tension measurement device is devoid of rollers between a first one of the pair of rotatable first support rollers and the pressing portion and between a second one of the pair of rotatable first support rollers and the pressing portion,

the pressing portion protrudes, with respect to a phantom line connecting the pair of second support rollers to each other, toward the pair of first support rollers, and

a positional relationship between the pressing portion and the pair of second support rollers is constant wherein the pair of first support rollers is rotatably supported in a first casing, the pair of second support rollers is rotatably supported in a second casing, and the tension measurement device is capable of measuring the tension of the measurement target by clamping the measurement target between the first and second casings.

2. The tension measurement device of claim 1 , wherein

the pair of first support rollers is rotatably supported on a roller-supporting member which is provided inside the first casing and movable with respect to the pair of second support rollers.

3. The tension measurement device of claim 1 , wherein

the first and second casings are coupled to each other via a hinge portion such that the first and second casings can be opened and closed.

4. The tension measurement device of claim 3 , wherein

a clamping rod is pivotably mounted to one of the first casing or the second casing, and

a rod housing is provided for the other of the first casing or the second casing, the rod housing being configured to house the clamping rod when the first and second casings are closed.

5. The tension measurement device of claim 1 , wherein

the measurement target is a lashing belt, and

the tension measurement device is capable of measuring a tension of the lashing belt by clamping the lashing belt between the first and second casings, while the lashing belt remains tightened to hold an object still.

6. The tension measurement device of claim 1 , wherein

the second casing has

a display portion which is capable of displaying a result of measurement carried out by the load cell, and

an operation portion through which the load cell is caused to carry out the measurement.

7. The tension measurement device of claim 6 , wherein

the first or second casing is capable of housing a battery which supplies power to the load cell, the display portion, and a calculator configured to calculate the tension of the measurement target from a value obtained by the load cell.

8. A tension measurement device comprising:

a pair of rotatable first support rollers;

a pressing portion arranged to face a midpoint between the pair of first support rollers; and

a load cell capable of measuring a load applied to the pressing portion,

the tension measurement device being capable of measuring a tension of a measurement target by clamping the measurement target between the pair of first support rollers and the pressing portion, wherein

a pair of rotatable second support rollers is arranged to face the pair of first support rollers,

the pressing portion protrudes, with respect to a phantom line connecting the pair of second support rollers to each other, toward the pair of first support rollers,

a positional relationship between the pressing portion and the pair of second support rollers is constant,

the pair of first support rollers is rotatably supported in a first casing,

the pair of second support rollers is rotatably supported in a second casing,

the tension measurement device is capable of measuring the tension of the measurement target by clamping the measurement target between the first and second casings, and

the first and second casings are coupled to each other via a hinge portion such that the first and second casings can be opened and closed.

9. The tension measurement device of claim 8 , wherein

the pair of first support rollers is rotatably supported on a roller-supporting member which is provided inside the first casing and movable with respect to the pair of second support rollers.

10. The tension measurement device of claim 8 , wherein

a clamping rod is pivotably mounted to one of the first casing or the second casing, and

a rod housing is provided for the other of the first casing or the second casing, the rod housing being configured to house the clamping rod when the first and second casings are closed.

11. The tension measurement device of claim 8 , wherein

the measurement target is a lashing belt, and

the tension measurement device is capable of measuring a tension of the lashing belt by clamping the lashing belt between the first and second casings, while the lashing belt remains tightened to hold an object still.

12. The tension measurement device of claim 8 , wherein

the second casing has

a display portion which is capable of displaying a result of measurement carried out by the load cell, and

an operation portion through which the load cell is caused to carry out the measurement.

13. The tension measurement device of claim 12 , wherein

the first or second casing is capable of housing a battery which supplies power to the load cell, the display portion, and a calculator configured to calculate the tension of the measurement target from a value obtained by the load cell.