JP2894414B2 - Line length measuring device for fishing reels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a line length measuring device for a fishing reel.

[0002]

2. Description of the Related Art The present applicant has previously filed Japanese Patent Application No. Hei.
No. 2 (JP-A-3-223614), Japanese Patent Application No. 3-386.
No. 71 (JP-A-4-276510) or Japanese Patent Application No. 3-1.
No. 77960 (Japanese Patent Application Laid-Open No. 5-23083) and Japanese Patent Application No. Hei 3-23083.
187456 (JP-A-5-30882), etc.
A fishing line length measuring device for a fishing reel capable of measuring the amount of reeling out or winding of fishing line from the number of rotations of a spool has been disclosed.

These yarn length measuring devices include a sensor for detecting the rotation of a spool rotatably supported on a reel body, an up / down counter for counting up and down a pulse signal output from the sensor, and a spool. Transmitting means for emitting an ultrasonic beam to the surface of the fishing line wound on, receiving means for receiving a reflected wave of the ultrasonic beam reflected from the surface of the fishing line, and ultrasonic waves emitted from the transmitting means to the receiving means Time measuring means for measuring the time until reception, a thread diameter detecting means for converting the time measured by the time measuring means into an electric signal proportional to the thread diameter, a thread diameter data from the thread diameter detecting means, and And a calculating means for calculating the yarn length based on the count value of the down / counter, and a display for displaying the yarn length calculated by the calculating means. The time until the ultrasonic beam emitted from the ultrasonic sensor as the transmitting means is received by the ultrasonic sensor as the receiving means is measured by the time measuring means, and the measured time is converted into a line diameter, thereby obtaining the fishing line. This enables long measurement.

[0004]

Since ultrasonic waves generally have the property of oscillating with sound waves, they are affected by the environment (temperature) in which the ultrasonic sensor is used, and the speed of ultrasonic waves increases with temperature.

[0005] Since fishing reels are used throughout the four seasons, and there are warm days and cold days depending on the fishing day, a fishing line length measuring apparatus using an ultrasonic sensor as described above is used. However, the speed of the ultrasonic beam is affected by the temperature change.

However, a conventional yarn length measuring device measures the time until an ultrasonic beam is received by an ultrasonic sensor by a time measuring means and converts the time to a yarn winding diameter. Actually, no consideration is given to a change in beam speed. Therefore, even if there is a slight error, accurate measurement of the yarn length may not be performed due to a change in temperature.

Furthermore, in an electric fishing reel having a spool motor for winding and driving the spool built in the reel body, the heat generated by the spool motor may greatly affect the speed of the ultrasonic beam.

The present invention has been devised in view of the above circumstances, and is an improvement of the above-described conventional line length measuring device, which is a fishing reel which eliminates errors in line length measurement due to temperature changes in the use environment. It is an object to provide a yarn length measuring device.

[0009]

To achieve such object, according to an aspect of the yarn length measuring device of the fishing reel according to claim 1, supported disposed facing the spool attaches between the side plates of a reel main body
Temperature that is attached to the holding member and detects the ambient temperature of the reel body.
A degree sensor, a sensor for detecting rotation of the spool,
An up / down counter that counts up and down the pulse signal output from the sensor; transmitting means for emitting an ultrasonic beam onto the surface of the fishing line wound on the spool; and an ultrasonic beam reflected from the surface of the fishing line. Receiving means for receiving the reflected wave, and timing for measuring the time until the ultrasonic beam emitted from the transmitting means is received by the receiving means
Means, a correcting means for correcting a difference in speed of the ultrasonic beam due to the temperature detected by the temperature sensor, and a time measured by the time measuring means and the speed of the ultrasonic beam corrected by the correcting means, A bobbin diameter detecting means for converting into an electric signal proportional to the diameter, a calculating means for calculating the yarn length based on the bobbin diameter data from the bobbin diameter detecting means and the count value of the up / down counter, and a calculating means And a display for displaying the set yarn length. And according to claim 2
The present invention provides a fishing reel line length measuring device according to claim 1.
, A fishing reel takes up a spool on the reel body
Electric reel with a spool motor that drives
And features.

[0010]

According to the first aspect of the present invention, the transmitting means emits an ultrasonic beam onto the surface of the fishing line wound on the spool, the reflected wave is received by the receiving means, and the ultrasonic beam is received by the receiving means. Is received by the timer means.

On the other hand, the correction means corrects the difference in the speed of the ultrasonic beam due to the temperature detected by the temperature sensor. The thread diameter is calculated based on the speed of the ultrasonic beam corrected by the correcting means and the time obtained by the time measuring means, and the thread length is calculated based on the thread diameter data and the count value of the up / down counter. The arithmetic processing is performed. Thus, the temperature
Sensor detects errors in yarn length measurement due to temperature changes in the operating environment.
Even if you are fishing in a harsh environment of use environment,
The support member protects the temperature sensor from external force.
On the other hand, according to the invention of claim 2, the spool motor
Temperature sensor eliminates errors in yarn length measurement due to heat generation
Becomes

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. Figure 1 is a partially cutaway plan view of a fishing reel equipped with a yarn length measuring device according to a first embodiment of claim 1, 2
3 is a sectional view of the fishing reel, and FIG. 3 is a rear view of the fishing reel. In FIG.
A rotatable spool 7 is a manual handle. The rotational force of the manual handle 7 is transmitted to the spool 1 by a gear reduction mechanism 11 mounted in the right side plate 9 so that the fishing line 13 can be fed and wound. Is being done.

Reference numeral 15 denotes a control mechanism housing (support member) for housing the control mechanism for the fishing reel.
5 is assembled between the right side plate 9 and the left side plate 17 of the reel body 5 so as to face the spool 1 . On the operation panel 19, a display 21 for digitally displaying the yarn length is provided.

Reference numeral 23 denotes a support for the reel body 5 located behind the spool 1. The support 23 is provided between the side plates 9 and 17 so as to function as a summing bar. In order to improve the feel of the fingertip, the upper surface is rounded as shown in FIG. 4, and the lower surface is formed flat and the rear end is formed to project rearward of the reel body 5. I have.

A sensor support is provided on the lower surface of the column 23.
(Supporting Member) Two sensor mounting holes 2 provided on the spool facing surface 27 of the sensor support 25
9, ultrasonic sensors 31 and 33 are attached to the spool 1 so as to face each other.

As shown in FIG. 5, the ultrasonic sensor 31 is similar to the transmitting ultrasonic sensor in the conventional yarn length measuring device.
The ultrasonic sensor 33 functions as a transmitting unit that emits the ultrasonic beam 35 to the surface P of the fishing line 13 wound on the spool 1, and the ultrasonic sensor 33 functions as a receiving unit that receives the reflected wave 37 reflected from the surface P. Things.

The sensor support 2 for supporting these components
5 is a pair of upper and lower divided sensor supports 2 as shown in FIG.
5a, 25b, a V-shaped sensor opening surface 2 is provided at the center of the spool facing surface 27 facing the spool 1.
7a are formed. Then, both split sensor supports 2
If the 5a and 25b are joined from above and below and fixed with screws 39 as shown in FIG. 3, two sensor mounting holes 29 are opened in the sensor opening surface 27a, and the ultrasonic sensors 31 are respectively provided in the sensor mounting holes 29. , 33, the ultrasonic sensors 31, 33 are arranged in a V-shape, and the ultrasonic sensor 33 can satisfactorily receive the reflected wave 37 of the ultrasonic beam 35 emitted from the ultrasonic sensor 31. ing.

The mounting of the sensor support 25 is performed by fixing the mounting pieces 41 mounted on both sides of the divided sensor support 25a to the side plates 9, 17 with screws 43. Then, as shown in FIG.
5 is attached to the lower surface of the column 23, the sensor support 2
The mounting piece 41 is attached to the sensor support 25 such that the ultrasonic sensor 5 is tilted upward and the ultrasonic sensors 31 and 33 face the axis of the spool shaft 3.
Are attached at a predetermined angle with respect to.

When mounted on the lower surface of the column 23,
The sensor support 25 has its spool facing surface 27
The spool-side tip 23a of the support 23 is displaced rearward from the spool-side tip 23a of the column 23 in such a manner as to be positioned behind the spool-side tip 23a. As shown in 2, the seawater W scattered from the fishing line 13 to the rear of the spool 1 is blocked by the column 23 so that the seawater W does not splash on the sensor opening surface 27a.

Since the ultrasonic sensors 31 and 33 are arranged very close to each other, as shown in FIG.
A resonance member 45 made of urethane foam for preventing resonance between the ultrasonic sensors 31 and 33, and a shield member 47 formed of a flexible substrate for preventing the ultrasonic sensors 31 and 33 from each other and external noise and maintaining the original performance of the sensor. It is wound. Then, the ultrasonic sensor 31,
When the attachment 33 is mounted, the respective surfaces 31a and 33a are flush with the sensor opening surface 27a.

Therefore, as described above, when the device is wound up, the seawater W scattered behind the spool 1 is not blocked by the column 23 and does not reach the sensor opening surface 27a. , 33a also has seawater W
Is not taken.

Then, as shown in FIG. 2, the protective cover 49 covers the outer periphery of the sensor
It is screwed to. The protective cover 49 protects the sensor support 25 from the falling of the fishing reel and external force, and is formed into a substantially L-shaped cross section which comes into contact with the outer periphery of the sensor support 25 as shown in FIG. Screws are attached to the mounting portions 53 of the side plates 9 and 17.

As shown in FIG. 7, the center of the spool-side tip 49a of the protective cover 49 is connected to the sensor opening surface 27.
a, the sensor opening surface 27a is larger than the spool-side tip 49a by an m dimension (1 to 3).
mm) of the ultrasonic sensors 31, 33 by projecting the sensor opening surface 27a by the m dimension toward the spool 1.
When the surface 3a becomes dirty, the surfaces 31a and 33a can be cleaned with a cotton swab or the like without removing the protective cover 49.

Further, as shown in FIG. 1, a temperature sensor 55 for detecting the peripheral temperature of the reel body 5 is provided in the sensor support 25, and the temperature detected by the temperature sensor 55 will be described later. To be input to the microcomputer 57 which performs the processing.

FIG. 5 shows the details of the control mechanism housed in the control mechanism housing body 15. In the figure, reference numeral 57 denotes a microcomputer which performs a thread length calculation, a thread length display and data writing control. Reference numeral 57 denotes a CPU (central processing unit) 59 which controls and manages a program memory, a data memory, a timer, and an input / output device, and executes necessary operations and transfer processing for processing a given job; 61 for storing the thread length calculation formula
And R for storing data such as the calculation result of the CPU 59.
AM 63, an input interface 65 and an output interface 67, which are
It is connected to PU59.

A rotation sensor 71 detects the rotation of the spool 1 and its direction.
a, 71b, and a plurality of magnets 71c fixed to the inner peripheral edge of the spool 1 opposed thereto. Then, a forward / reverse determination signal of the spool 1 obtained by turning on / off the reed switches 71 a and 71 b by the magnet 71 c earlier is taken into the CPU 59 through the input interface 65.
The built-in up / down counter 73 is set to an up-count or down-count state.

The reed switches 71a and 71b are turned on.
By inputting the rotation pulse of the spool 1 obtained by / OFF to the up / down counter 73 through the input interface 65, the counter 73 is up-counted or down-counted.

The input interface 65 is connected to the ultrasonic sensor 33 via a receiving circuit 75 and the temperature sensor 55, and the output interface 67 is connected to the ultrasonic sensor via a transmitting circuit 77. The display 21 is connected via the decoder 31 and the decoder 79. Then, the ultrasonic beam 3 emitted from the ultrasonic sensor 31
Time difference Δt until 5 is received by the ultrasonic sensor 33
With a timer 81 built in the microcomputer 57.
Is configured to measure.

Thus, in the conventional line length measuring device, the surfaces P ₁ , P ₂ , P _{3 of} the fishing line 13 that change during feeding and winding and the two ultrasonic sensors 31, based on the measured time difference Δt.
The distance d between the target and the target 33 is uniformly calculated by the following formula: distance d = sonic speed 331 (m / sec) × 1/2 × Δt stored in the ROM 61. That is, the distance d can be obtained by measuring the time Δt.

However, as is widely known, the velocity V in the air at T ° C. is determined by the equation of velocity V = (331.5 + 0.61 T) m / sec. Increases with temperature under the influence of temperature changes.

Therefore, the ultrasonic beam 3 due to the temperature change
The speed V is set to 331 without considering the speed change of 5 at all.
When the distance d is obtained as m / sec, a slight error occurs, and as a result, the measured yarn length is affected.

Therefore, in this embodiment, instead of the formula of distance d = sonic speed 331 (m / sec) × 1/2 × Δt, velocity V = (331.5 + 0.61T) m / sec and distance d = V The expression of × 1/2 × Δt is stored in the ROM 61. Then, the actual speed V of the ultrasonic beam 35 at the temperature detected by the temperature sensor 55 is obtained from the above equation, and the CPU 59 calculates the distance d based on the obtained speed V, and calculates the distance d to be described later. The calculation data of the diameter D is used.

FIG. 8 shows the transmission circuit 77 and the reception circuit 7.
5, when a signal for instructing measurement is input to the trigger terminal 83 from the CPU 59, the transistor 85 is turned off.
After N, a high-voltage pulse signal is applied to the ultrasonic sensor 31 from the pulse transformer 87 by the number of waves of the CPU 59.

The ultrasonic beam 35 is reflected on the surface P of the fishing line 13 to become a reflected wave 37, enters the ultrasonic sensor 33, and induces a reception wave voltage. The received wave voltage enters the receiving circuit 75, passes through a plurality of stages of amplification circuits, passes through the detection transformer 89, and is output from the detector terminal 91 to the input interface 65 of the microcomputer 57.

On the other hand, the timer 81 starts with a signal instructing measurement by the CPU 59 and ends the measurement with a signal from the detector terminal 91. The time difference Δt is stored in the RAM 63 and used for calculating the distance d.

FIG. 9 shows an example of the time difference measurement. For example, the ultrasonic sensor 31 sends a signal to the ultrasonic sensor 31 once every quarter rotation of the spool.
A transmission voltage waveform 93 is applied for a time of μs, and an ultrasonic beam 35 is emitted from the ultrasonic sensor 31 to the surface P of the fishing line 13.

The reflected wave 37 reflected by the surface P enters the ultrasonic sensor 33 and induces a voltage.
5, and is output as a reception pulse 37. Then, the time difference 150 μs from the rise of the transmission pulse to the rise of the reception pulse is stored in the RAM 63 as the time difference Δt.

FIG. 10 shows the relationship between the sensor output voltage appearing at the detector terminal 91 in FIG. 8 and the distance d from the sensor surface to the surface P of the fishing line 13 when the reel performs the feeding / winding operation of the fishing line 13. And plotted.

The distance d and the sensor output voltage have a linear relationship. Then, the thread winding diameter D is obtained by the CPU 59, and the thread length is calculated as described later.

Assuming that the distance between the ultrasonic sensors 31 and 33 and the spool shaft 3 is c as shown in FIG. 5, the thread diameter D is expressed by the following equation: thread diameter D = (cd) × 2. Can be easily obtained.

Next, a description will be given of the yarn length measuring operation of the present embodiment configured as described above according to the processing procedure shown in FIG. When the program of FIG. 11 is started, first, in step S1, it is determined whether or not the fishing line 13 is fed.

Here, when it is determined that the fishing line 13 is being advanced, the spool 1 is rotated in the forward direction in accordance with the advance of the fishing line 13, and a signal in the forward direction is supplied from the rotation sensor 71 to the input interface 65. Through CPU5
9 and thereby the up / down counter 7
3 is set in the up direction, and a pulse signal for each rotation of the spool output from the rotation sensor 71 with the rotation of the spool 1 is taken into the up / down counter 73 through the input interface 65 and is sequentially counted up. (Step S2).

In the next step S3, the CPU 59 takes in the count content N of the up / down counter 73 for each calculation cycle of the microcomputer 57, and
U59 obtains the velocity V of the ultrasonic beam 35 at the temperature detected by the temperature sensor 55 by the equation of velocity V = (331.5 + 0.61T) m / sec, and calculates the distance d based on the velocity V. d = V × 1/2 × Δt, and the thread winding diameter D is calculated by the following equation: thread winding diameter D = (cd) × 2.

The voltage corresponding to the thread diameter D is represented by A
The digitally converted data is taken in by the -D converter, the thread length L = π · DN is calculated in the next step S4, and the calculation result is output to the display 21 through the output interface 67 and the decoder 79, The feed line length L of the fishing line 13 is digitally displayed (step S
5).

On the other hand, if it is determined in step S1 that the fishing line 13 has been wound, the spool 1 is rotated in the reverse direction along with the winding of the fishing line 13, so that the rotation sensor 71 Direction signal is input interface 6
5 to set the up / down counter 73 in the down direction. At the same time, the pulse signal output from the rotation sensor 71 with the reverse rotation of the spool 1 is taken into the up / down counter 73, Subtraction is performed from the contents counted at the time of feeding by the counting operation (step S6).

Then, in the next step S7, the count content Na of the up / down counter 73 is fetched into the CPU 59 at each calculation cycle of the microcomputer 57, and similarly, the calculation of La = π · D · Na is executed. The winding yarn length, that is, the yarn length La obtained by subtracting the winding yarn length from the unwound yarn length is calculated,
This is output to the display 21 to digitally display the yarn length La (step S8).

As described above, in the present embodiment, the temperature sensor 55
, The peripheral temperature T ° C. of the reel body 1 is detected, and the velocity V of the ultrasonic beam 35 is calculated and determined from the equation of velocity V = (331.5 + 0.61 T) m / sec. The distance d = V × 1 The calculation of L = π · D · N is performed by the CPU 59 according to the following formula: / 2 × Δt and the thread winding diameter D = (cd) × 2. The disadvantage of the conventional yarn length measuring device, such as an error in yarn length measurement due to a change, can be solved.

[0048] In addition, the spool 1 in the specification seat winding of the fishing line 1
When the spool 3 is wound, as shown in FIG.
Of the seawater W is scattered behind, but the spool-side tip 23a of the column 23 projects toward the spool 1 and the ultrasonic sensors 31,
Since the strut 23 blocks the seawater W that is going to scatter on the surfaces 31a, 33a of the 33, the adhesion of the seawater W to the surfaces 31a, 33a of the ultrasonic sensors 31, 33 is prevented. Soshi
The temperature sensor 55 is mounted inside the sensor support 25.
Therefore, the temperature sensor 5 is
5 will be protected from external forces. Therefore, this embodiment
According to the method described above, the fishing line 13
Detection of nearby ambient temperature can be used in fishing places where the use environment is severe
Provide sufficient strength protection from external forces and perform stably
Has the advantage that

Of course, on the outer periphery of the ultrasonic sensors 31 and 33,
A resonance member 45 for preventing resonance and noise between the ultrasonic sensors 31 and 33 and a shield member 47 are wound, and the sensor opening surface 27a is further protruded toward the spool 1 by a distance of m from the protection cover 49, thereby forming a protection cover. Since the surfaces 31a and 33a of the ultrasonic sensors 31 and 33 can be easily made with a cotton swab or the like without removing the 49, the performance of the ultrasonic sensors 31 and 33 is maintained with higher accuracy than before, and the yarn length is measured. Can always be performed satisfactorily.

In the first embodiment, the temperature sensor 55 is mounted in the sensor support 25 as shown in FIG.
Is protruded temperature sensor 55 from the sensor support 25 as in the second embodiment according to claim 1 shown in FIG. 12, Li Lumpur body 5
Also it detects the ambient temperature T ℃ of not good. In each of the above embodiments,
Installed the temperature sensor 55 on the sensor support 25,
A spool according to a third embodiment of the present invention shown in FIG.
1 and the right side plate 9 and the left side plate 17 of the reel body 5
On the operation panel 19 of the control mechanism housing 15 mounted in between
The temperature sensor 55 may be attached to the
However, similarly to the first embodiment, the control mechanism housing 15
The temperature sensor 55 is protected from external force
Of the ambient temperature approaching the fishing line 13 which is the object of the beam
Detection is sufficient even from fishing places where the use environment is severe
It is possible to stably perform the protection with strength.

In each of the above embodiments, the yarn length is measured by calculating the speed V of the ultrasonic beam 35 at the temperature detected by the temperature sensor 55. However, the ambient temperature T ° C. and the time difference Δt, The speed V of the ultrasonic beam may be stored in the ROM 61 as a map from the distance d, and the yarn length measurement may be performed by correcting the difference in the speed of the ultrasonic beam due to a change in the ambient temperature based on the map.

Thus, even with such a structure, the intended purpose can be achieved as in the above embodiments.
Although not shown, the present invention relates to claims 1 and 2.
It can also be applied to a fishing electric reel. Immediately
Also, as described above, the spool is driven to take up the spool.
For electric reels with a motor built into the reel body,
Heat generated by the spool motor greatly affects the speed of the ultrasonic beam.
However, the sensor support 25 may be attached to the electric reel.
And the ultrasonic wave sensors 31 and 3
In measuring the yarn length in step 3, the temperature sensor 55
If mounted on the sensor support 25 or the control mechanism housing 15,
Yarn length due to heat generated by spool motor by degree sensor 55
Measurement errors can be eliminated and the sensor support 2
5 and the control mechanism housing 15 maintain the temperature sensor 55 from external force.
In order to protect the fishing line 13
Detection of approaching ambient temperature can be used in fishing environments where the use environment is severe
To ensure sufficient strength protection from external forces
It has the advantage that it can be.

[0053]

As described above, according to the present invention, according to the line length measuring device fishing reel according to each claim, the disadvantages of the conventional line length measuring device such as an error of the yarn length measurement due to a temperature change of use environment This has made it possible to measure the line length of fishing line unwinding and winding with high accuracy regardless of the line type. Also, temperature
Since the sensor was mounted on the support member, the support member
Ultrasonic beam target to protect the sensor from external force
Detection of the ambient temperature approaching the fishing line, which is the body,
Sufficient strength protection from external forces even in severe fishing areas
It has the advantage that it can be performed stably. And billing
According to item 2, measurement of the yarn length by the heat generated by the spool motor is performed.
The error can be eliminated.

[Brief description of the drawings]

1 is a cutaway plan view of a portion of the reel fish equipped with yarn length measuring device fishing according to a first embodiment of claim 1.

FIG. 2 is a sectional view of the fishing reel shown in FIG. 1;

FIG. 3 is a rear view of the fishing reel shown in FIG. 1;

FIG. 4 is an exploded sectional view of a sensor support and a protective cover.

Figure 5 is an overall configuration diagram of a line length measuring device according to a first embodiment of claim 1.

FIG. 6 is a perspective view of a sensor support.

FIG. 7 is a bottom view of the fishing reel shown in FIG. 1;

FIG. 8 is a transmission / reception circuit diagram of the ultrasonic sensor.

FIG. 9 is an explanatory diagram showing a relationship between transmission and reception of an ultrasonic beam in the first embodiment of the first embodiment.

FIG. 10 is a graph showing a relationship between a distance and a time difference.

FIG. 11 is a flowchart showing a procedure of yarn length measurement.

12 is a cutaway plan view of a portion of a fishing reel equipped with a yarn length measuring device according to a second embodiment of claim 1.

13 is a cutaway plan view of a portion of a fishing reel equipped with a yarn length measuring device according to a third embodiment of claim 1.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A01K 89/00-89/08

Claims (2)

(57) [Claims] 1. A spool attached between side plates of a reel body.
Mounted on the support member facing the
A temperature sensor for detecting the temperature, sensors and, the up / down counter for up-and down-counts the pulse signal output from the sensor, ultrasound on the surface of the fishing line wound on the spool for detecting the rotation of the spool Transmitting means for emitting a beam, receiving means for receiving a reflected wave of the ultrasonic beam reflected from the surface of the fishing line, and timing for measuring a time until the ultrasonic beam emitted from the transmitting means is received by the receiving means. means and a correction means for correcting the difference in the speed of the ultrasonic beam by the detected temperature by the temperature sensor, the speed of the ultrasonic beams corrected by the time and the correcting means which is measured by the time measuring means, yarn A thread diameter detecting means for converting the signal into an electric signal proportional to the diameter; a thread length based on the thread diameter data from the thread diameter detecting means and the count value of the up / down counter. Calculating means for calculating a display for displaying the yarn length calculated by the calculating means, the yarn length measuring device of a fishing reel, characterized in that it comprises a. 2. A fishing reel comprising a spool mounted on a reel body.
With an electric reel equipped with a spool motor that drives the winding
2. The fishing reel thread according to claim 1, wherein
Length measuring device.