JPH024841B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital tape measure that digitally displays measurement results.

A general tape measure has a structure in which a scale is attached to a long body for length measurement, and the scale is read directly by manipulating the long body and placing it on the object to be measured. The disadvantage is that it is easy to misread the scale, and the scale becomes dirty with dirt, dust, oil, etc., making it difficult to read.

Therefore, recently, small holes are arranged at predetermined intervals in a long body for length measurement, and the number of passages through the small holes when the long body is operated is electrically detected and counted.
A so-called digital tape measure was devised to digitally display this counting result as a numerical value (for example,
-33065), the above-mentioned drawbacks have been solved.

However, on the other hand, new problems have arisen with this type of digital tape measure, as described below, and improvements are desired. In other words, since a large number of small holes are arranged in the elongated body for length measurement, the strength of the elongated body decreases, stress concentrates on the small hole part due to external force, and it is easy to break. ,When using, please remove mud and
The small holes are clogged with dust, oil, etc., which tends to cause detection errors, and the product also has a poor aesthetic appearance.

The present invention has been made in view of such conventional problems, and includes a main elongated body for length measurement and a sub-elongated body for counting that operates in response to the operation of the main elongated body. To provide a digital tape measure whose main elongated body is hard to be damaged and detection errors do not occur, and which has a good appearance as a product by being housed inside a tape measure case.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings.

The digital tape measure according to the present invention is shown in FIGS. 1 to 4.
As shown in the figure, a digital tape measure 1 includes a main elongate body 2 for length measurement, a sub elongate body 3 for counting, a detection means 4, and a digital display means 5 as main parts.

The main elongated body 2 is used to measure the length by directly applying it to the object to be measured, and is made of material similar to a general tape measure, such as a steel strip or a synthetic resin strip containing glass fiber as a reinforcing material. things are used.
The main elongated body 2 is wound with its base end connected to the main core body 6, and the main core body 6 is rotatably housed in the tape measure case 7, while the tip end is connected to the outlet of the tape measure case 7. 7
b, and an L-shaped locking fitting 8 is attached to the tip thereof. In addition, the main elongated body 2
A length measurement scale 9 is attached to the surface 2a. The main core body 6 is equipped with a conventionally well-known winding mechanism (not shown), and has a function of automatically winding up the drawn out main elongate body 2 in the direction of arrow A using a winding lever (not shown). ing.

The secondary elongated body 3 operates in response to the operation of the main elongated body 2, and is made of metal strips such as steel strips, cord strings, synthetic resin strips containing glass fiber as a reinforcing material, Alternatively, a band made of carbon fiber, synthetic resin fiber, etc. may be used. Further, the secondary elongated body 3 is made to have the same thickness as the main elongated body 2 as shown in FIG.
As shown in FIG. 1, a large number of small holes 10 are bored in the sub-long body 3 at predetermined intervals in the longitudinal direction as counting marks, and the base end of the sub-long body 3 is connected to the main core body 6. The main elongated body 2 is wound in parallel with the main elongated body 2, while the tip end is connected to the sub-core body 11. The sub-core body 11
has approximately the same diameter and narrow width as the main core 6, and is rotatably housed inside the tape measure case 7 on the opposite side from the main core 6. Further, like the main core body 6, the sub-core body 11 is equipped with a winding mechanism (not shown) and has a function of winding up the sub-long body 3 in the direction of arrow B.
Note that the winding force (spring strength) of this sub core body 11 is set to be weaker than the winding force of the main core body 6; for example, while the winding force of the main core body 6 is 200 g,
The winding force of the sub-core body 11 is set to 50 g. Therefore, in the normal state, the sub-elongate body 3 is wound around the main core body 6, like the main elongate body 2. 12 is a guide roller that guides the sub-long body 3.

The detection means 4 detects the small holes 10 on the sub-elongated body 3, and is disposed at a position where the sub-elongated body 3 passes, that is, between the guide rollers 12, 12. The detection means 4 is a transmission type optical detection system including an optical sensor consisting of a light emitting element 13 and a light receiving element 14, and the light emitting element 13 and the light receiving element 14 face each other so as to sandwich the sub-elongated body 3 from above and below. It is arranged as follows. When the small hole 10 is located between these, the light from the light emitting element 13 is received by the light receiving element 14, and the detection means 4 outputs a detection signal.

The digital display means 5 digitally displays the detection result of the detection means 4 as a numerical value of length, is provided in the tape measure case 7 on the opposite side from the detection means 4, and is composed of an electronic circuit section 15 and a display section 16. The electronic circuit 15 includes a computer, a decoder, or a counter, receives and counts the detection signal from the detection means 4, and sends the counting result to the display section 16. The display section 16 is, for example, a liquid crystal type, and is provided on the outer surface, that is, the lower surface 7a, of the tape measure case 7, and is connected to the electronic circuit 1.
Digitally display the counting results from step 5.

When the main elongate body 2 is pulled out and applied to the object to be measured, the main elongate body 2 rotates the main core body 6 in the direction opposite to arrow A, and the sub-elongate body 3 also corresponds to the above operation. The number of small holes 10 that have passed through the detection means 4 by this operation is displayed on a digital display means through the detection means 4. 5, and the result, that is, the measurement result of the object, is digitally displayed on the display section 16. Conversely, when the winding lever is operated to wind up the main elongate body 2 onto the main core body 6, the sub-elongate body 3 is also wound around the main core body 6, and the display section 16 shows “0” is displayed digitally.

In the above embodiment, the detection means 4 and the digital display means 5 may have other structures known in the art. For example, the detection means 4 may include a reflective optical detection system, a magnetic detection system such as a Hall element, or a proximity switch. A detection system for detecting changes in shape and dimensions such as metal detection switches or limit switches may be considered. In this case, the counting mark on the sub-elongated body 3 may be replaced with the small hole 10 and a printed mark for an optical sensor corresponding to each of the above-mentioned detection systems. , a magnetic mark, a metal mark, a notch mark, or the like may be used.

As detailed above, in the present invention, the base end of the auxiliary elongated body for counting is connected to the main core body around which the main elongated body for length measurement is wound, while the tip of the auxiliary elongated body is connected to the main core body around which the main elongated body for length measurement is wound. A detection means is connected to a sub-core body having a winding force smaller than the winding force of the main core body, and a detection means for detecting a counting mark on the sub-elongate body is disposed at a passing position of the sub-elongate body, and the tape measure case Since the display section of the digital display means that displays the detection results of the detection means is provided on the outer surface of the main elongated body, the main elongated body has sufficient strength and is difficult to damage, making it difficult to detect dirt caused by dirt, dust, oil, etc. No mistakes occur, and the product has a good aesthetic appearance. Moreover, since the length measurement results are displayed digitally, they are easy to see and are less likely to be misread.

Further, in the present invention, the counting mark is provided on the sub-elongate body which is wound around the main core in parallel with the main elongate body and has the same thickness as the main elongate body. The scale of the main elongate body and the counting of the sub elongate body can be calculated because the thickness of the sub elongate body is equal to the thickness of the main elongate body. The marks are synchronized and accurate measurements can be obtained.

Furthermore, in the present invention, since the tip of the sub-elongate body is connected to the sub-core body having a winding force smaller than the winding force of the main core body, the sub-elongate body is connected to the main core body and the sub-core body. It is constantly maintained in a tensioned state, making it difficult for errors to occur in the detection results of the counting marks by the detection means.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, in which FIG. 1 is a plan sectional view showing a digital tape measure, FIG. 2 is a sectional view taken along the line - in FIG. 1, FIG. 3 is a bottom view, and FIG. The figure is a sectional view taken along the - line in FIG. 1. 2... Main elongated body, 3... Sub-elongated body, 4... Detection means, 5... Digital display means, 6... Main core body,
7... Tape measure case, 7a... Outer surface (lower surface), 10
... Counting mark (small hole), 11 ... Sub-core body, 16
...Display section.

Claims (1)

[Claims] 1. The proximal end of a sub-elongate body having the same thickness as the main elongate body and having counting marks is connected to the main core body around which the main elongate body for length measurement is wound, and is parallel to the main elongate body. While being wound, the tip of the sub-elongate body is connected to a sub-core body having a winding force smaller than the winding force of the main core body, and the sub-elongate body is placed at a passing position of the sub-elongate body on the sub-elongate body. A digital tape measure characterized in that a detection means for detecting counting marks is disposed, and a display section of a digital display means for displaying the detection result of the detection means is provided on the outer surface of the tape measure case.