JPS60133303A - Digital measuring tape - Google Patents

Abstract

PURPOSE:To prevent reduction in strength of a main long scale body and to prevent the detection errors, by providing a subsidiary long scale body for counting, which is operated in correspondence with the operation of the main long scale body, in addition to the main long scale body for measuring the length. CONSTITUTION:The base end of a counting subsidiary long scale 3 is connected to a main reel 6, around which a main long scale body 2 for measuring length is wound. The tip of the subsidiary long scale 3 is connected to a subsidiary reel 11, which has a winding force smaller than that of the main reel 6. Meanwhile, small holes 10 as counting marks are provided in the subsidiary long scale 3. When the main long scale body 2 is drawn out for measurement and operated, the subsidiary long scale body 3 is correspondingly wound by the subsidiary reel 11 and operated. The number of the small holes 10 is detected by a detecting means 4 during this operation, and the counted value is displayed on a display device 16. Since such a counting subsidiary long scale body is provided, reduction in strength of the main long scale body and the detection errors can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention number j1 relates to a digital tape measure that digitally displays measurement results.

A general tape measure 1J has a structure in which a scale is attached to a long body for length measurement, and the scale can be read directly by manipulating the long body and placing it on the object to be measured. It is easy to misread the scale, and the scale gets dirty with dirt, dust, oil, etc., resulting in a reading of <7.

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 that digitally displays the result as a numerical value was devised (for example, see Japanese Utility Model Application Publication No. 50-3306!), which solved the above-mentioned drawback. New problems such as 1j and below have arisen in digital tape measures, and improvements to these problems have been 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, and stress is concentrated on the small hole part due to external force, making it easy to break. Furthermore, during use, the small holes become clogged with dirt, dust, oil, etc., which tends to cause detection errors, and the aesthetic appearance of the product is also poor.

The present invention has been made in consideration 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 which does not cause detection errors due to damage of one main elongated body by being installed inside a tape measure case and has a good appearance as a product.

Below, the configuration of the present invention will be explained based on the drawings for m columns.

The digital tape measure according to the present invention is shown in FIGS.
The main parts include a sub-long body (3) for counting, a detection means (4) and a digital display means (5).

The main elongated body (2nd j) is used to actually measure the length by applying it directly to the object to be measured. You can use something similar to the tape measure.

The main elongated body (21fJ) is connected to the main core body (6) at the proximal end and wound, and the main core body (6) is rotatably installed inside the tape measure nurse (7), while the tip end is connected to the main core body (6) and wound. is pulled out from the outlet (7a) of the tape measure 7), and an L-shaped locking fitting (8) is attached to the tip thereof. Further, a number length measurement scale (9) is not attached to the surface (2&) of the main elongate body (2). The main core body [61);j is equipped with a conventionally well-known winding mechanism (not shown), and automatically winds the drawn-out main elongate body (2) in the direction of arrow A using a winding lever (not shown). It has the ability to take

It operates in response to the operation of the secondary elongate body (3rd j main elongate body (2), and as the raw side [a composite material containing a metal strip such as a 1% steel strip, a braided body, and glass fiber as a reinforcing material] A belt made of resin, or a belt made of Itsu, carbon fiber, synthetic resin fiber, etc.
A cord-like body is used. 1 on the secondary elongate body (3)
'j, a large number of small holes 0ω are placed as counting marks at predetermined intervals in the longitudinal direction, and the base end of the sub-elongated body (3) is connected to the main core body (6) for winding. , the tip is connected to the sub-core body (b). The sub core (uJ tj) has approximately the same diameter and narrow width as the main core (6), and has a rotating capacity in the tape measure booth (7) on the opposite side of the main core (6). In addition, it is equipped with a winding mechanism (not shown) similar to the sub-core body (IIJ ill main core body (6)), and has a function of winding up the sub-elongated body (3) in the direction of arrow B. It should be noted that the winding force (spring strength) of this secondary core body (6) is set to be weaker than the winding force of the main core body (6).
6), the winding force is 2001, whereas the sub-core Q
The winding force t*s o y is set as follows.

Therefore, under normal conditions, the secondary elongated body (311J, like the main elongated body (2), is wrapped around the main core body (6). (b) The guide roller that guides the ljj elongated body (3) be.

In addition, the sub-long body (311j) may also use an endless band body.

Detection means (detects the small holes on the sub-elongated body (3) of group 4, and is arranged at the passing position of the sub-elongated body (3), that is, between the guide rollers (b) and (b).ゎTeshi)ru. The detection means (4) is a transmission type optical detection system including an optical sensor consisting of a light emitting element (b) and a light receiving element,
The light-emitting element (b) and the light-receiving element (141 + co-elongated body (3)
) are placed facing each other from above and below with tJ between them, and the light from the small hole (when IG is located, light emitting element 03) is detected between these elements. Means (4) outputs a detection signal.

The detection result of the digital display means (5th j detection means (4) is digitally displayed as a length value.
It is provided in the tape measure case (7) on the opposite side of 4) and consists of an electronic circuit section) and a display section 06). Electronic circuit (+5)
It includes an iJ computer, a decoder, and a number j counter, receives and counts the detection signal from one detection means (4), and sends the counting result to the display section 06). The display section θ6)
For example, it is of a liquid crystal type, and is provided on the outer surface, that is, the lower surface (7a) of the tape measure tip (7), and digitally displays the counting results from the electronic circuit.

When the main elongate body (2) is pulled out and operated and applied to the object to be measured, the sub elongate body (3) also moves in response to the above operation without being wound around the sub core body (lυ). By this operation, the number of small holes (lα...) that have passed through the detection means (4) is displayed on the digital display means (5) via the detection means (4).
The electronic circuit unit 05) counts the object, and the result, that is, the length measurement result of the object, is digitally displayed on the display unit 00).

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 part (161kl, t
j%0# is displayed digitally.

In addition, in the above 14th sentence, the detection means (4) and the digital display means (5) #jj may be replaced by other well-known M forts. For example, the detection means (4) may be a reflective optical detection system, a hall, etc. A magnetic detection system such as an element, a metal detection switch such as a proximity switch, or a detection system for detecting changes in shape or dimension such as a limit switch, etc. can be considered.・・・
・A printed mark for an optical sensor, a magnetic mark, a metal mark, a 1j notch mark, etc. are also used in accordance with each of the above-mentioned detection systems.

As detailed above, the base end of the sub-elongate body for counting is connected to the main core body around which the main elongate body of the present invention (1111) is wound, while the tip of the sub-elongate body is Detection means is connected to a sub-core body that corrects a winding force smaller than the winding force of the main core body, and is provided at a position where the sub-elongate body passes through to detect a counting mark on the cut elongate body. 5. Since the display part of the digital display means that displays the detection results of the detection means is provided on the outer surface of the tape measure case, the strength of the main elongated body is sufficient and it is resistant to damage, dirt, dust, and oil. Detection errors due to dirt such as dirt do not occur, and the product also 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.

[Brief explanation of the drawing]

1 is a plan sectional view showing a digital tape measure, FIG. 2 is a sectional view along line 1 of FIG. 1, and FIG. 3 is a bottom view of FIG. Figure 1 is the same sectional view taken along the N-tv line in Figure 1. (2) Main elongated body (3) Subordinate elongated body (4)
・Detection means (5) ・Digital display means (6)・
...Main core (7)...Tape measure case (7a)...Outer surface (bottom surface) (11...Counting mark (small hole) (lη・
・・Sub-core body (16) ・・Display part Applicant: Block Resin Co., Ltd.

Claims (1)

[Claims] υ The proximal end of the sub-elongated body for counting is connected to the main core around which the main elongated body for length measurement is wound, while the tip of the sub-elongated body is lower than the winding force of the main core. is connected to a side mandrel having a small winding force, 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; A digital tape measure characterized in that it is provided with a display section of a digital display means for displaying the detection result.