JPH064603U - Length measuring instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a length measuring instrument which is excellent in measuring workability and can accurately display the unwinding length of a measuring rope. [Structure] A flexible measuring rope 1 having a spiral thread with a constant lead on the surface, a reel 2 for winding the measuring rope 1 so as to be able to be unwound, and an unwinding of the measuring rope 1 while meshing with the measuring rope 1 A measurement gear 8 that rotates with the rotation of the measurement gear, a rotation detector (rotary encoder 11) that detects the amount of rotation of the measurement gear 8, and a length display that displays the output signal of the rotation detector as the unwinding length of the measurement rope 1. And a container 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a length measuring instrument for measuring various lengths including a water level.

[0002]

[Prior art]

 As a conventional length measuring instrument, one provided with a measuring rope made of a flat member having scales on the side surface is widely used, and it is already known that the unwinding length of the measuring rope is displayed on a display.

However, in the length measuring instrument, due to the flat shape of the measuring rope, the measuring rope is in contact with various wall surfaces around the measuring environment when it is affected by wind during measurement or when the surface gets wet with water during measurement. Therefore, there are problems that the measurement workability is easily deteriorated and that an error is likely to occur when the unwinding length of the measurement rope is displayed on the display.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to provide a length measuring instrument which is excellent in measuring workability and which can accurately display the unwinding length of the measuring rope.

[0005]

[Means for Solving the Problems]

 The length measuring instrument according to the present invention comprises a flexible measuring rope having a spiral thread with a constant lead on the surface, a reel for winding the measuring rope so that the measuring rope can be unwound, and a measuring rope that meshes with the measuring rope. Consists of a measurement gear that rotates with the unwinding of the measurement gear, a rotation detector that detects the amount of rotation of the measurement gear, and a length indicator that displays the output signal of the rotation detector as the unwinding length of the measurement rope. Is. The reel is rotationally driven manually or by a drive source such as an electric motor, and a rotary encoder or the like can be used as a rotation detector.

In the length measuring instrument, a water level sensor can be provided by providing a water level sensor at the tip of the measurement rope and transmitting the output signal of the water level sensor through the measurement rope.

As the measurement rope, for example, a known transmission rope in which a winding is spirally wound around a core wire with a constant lead can be preferably used.

[0008]

[Action]

 At the time of measurement, the measurement rope is unwound from the reel while meshing with the measurement gear, the measurement gear rotates according to the unwinding length of the measurement rope, and the rotation amount of the measurement gear is detected by the rotation detector. In addition, the unwinding length of the measuring rope corresponding to the rotation amount is displayed on the length display.

In the case where the water level sensor is provided at the tip of the measurement rope, the unwinding length of the measurement rope at the time when the water level sensor detects the water level is the water level.

When a spirally wound winding is wound around a core wire as a measuring rope, the winding wire constitutes a spiral thread, and the core wire or the winding is electrically connected. It can also be used as an electric wire for transmitting and receiving signals.

[0011]

【Example】

 FIG. 1 is a side view of a length measuring instrument according to an embodiment of the present invention, showing a partially enlarged measuring rope.

In FIG. 1, a measuring rope 1 has a core 1a made of a stainless steel wire coated with a synthetic resin, and a winding 1b made of an electric wire coated with a synthetic resin is spirally fixed to form a screw thread. The core wire 1a and the winding wire 1b are wound with leads, and are fixed to each other in each covered synthetic resin.

The base end of the measurement rope 1 is connected to the reel 2 and the tip is connected to a water level sensor 3 with a weight, and the water level sensor 3 is an alarm indicator via the core wire 1a and the winding wire 1b of the measurement rope 1. 4 is connected. It should be noted that the water level sensor 3 may be attached with other sensors such as temperature and conductivity, if necessary.

The reel 2 is connected to an electric motor 6 through a gear device 5, and a reel winding device for even winding for swinging the measuring rope 1 on the reel 2 in the reel axial direction as the winding progresses. 7 is attached.

The measuring rope 1 unwound from the reel 2 is meshed with the measuring gear 8 and a pair of guide pulleys 9 for guiding the measuring rope 1 are provided in front of and behind the measuring gear 8 and the measuring gear 8 An arcuate guide trough 10 is provided along the edge to prevent the measuring rope 1 from falling off. A rotary encoder 11 as a rotation detector is connected to the rotary shaft of the measuring gear 8, and the rotary encoder 11 is connected to a length indicator 12.

When measuring the water level, the measuring rope 1 is unwound from the reel 2 by the weight of the water level sensor 3 and the measuring gear 8 is rotated in conjunction therewith, and the rotation amount of the measuring gear 8 is passed through the rotary encoder 11. The unrolled length of the measuring rope 1 is displayed on the length indicator 12. At the same time when the water level sensor 3 reaches the water surface, its output signal is displayed on the alarm indicator 4 via the measuring rope 1, and the unwinding length of the measuring rope 1 displayed on the length indicator 12 at that time is the water level. Becomes

After the measurement is completed, the reel 2 is driven to rotate in the winding direction by the electric motor 6 and the measuring rope 1 is evenly wound around the reel 2 while being swung in the reel axial direction via the rope swinging device 7. To be

[0018]

[Effect of device]

 Since the length measuring device according to the present invention is configured as described above, it is excellent in measuring workability and can accurately display the unwinding length of the measuring rope.

[Brief description of drawings]

FIG. 1 is a side view of a length measuring instrument according to an embodiment of the present invention, in which a measuring rope is partially enlarged.

[Explanation of symbols]

 1 Measuring rope 2 Reel 8 Measuring gear 11 Rotary encoder 12 Length indicator

Claims (3)

[Scope of utility model registration request] 1. A flexible measuring rope having a spiral thread of a constant lead on its surface, a reel for winding the measuring rope so that the measuring rope can be unwound, and meshing with the measuring rope and accompanying unwinding of the measuring rope. A length measuring instrument comprising a rotating measuring gear, a rotation detector that detects the amount of rotation of the measuring gear, and a length indicator that displays the output signal of the rotation detector as the unwinding length of the measuring rope. 2. The length measuring instrument according to claim 1, wherein a water level sensor is provided at the tip of the measuring rope, and an output signal of the water level sensor is transmitted through the measuring rope. 3. The length measuring instrument according to claim 1, wherein the measuring rope is formed by winding a winding on a core wire in a spiral shape with a constant lead.