CN2074902U

CN2074902U - Digital displaying callipers and band tape

Info

Publication number: CN2074902U
Application number: CN 90222529
Authority: CN
Inventors: 王忠祜
Original assignee: Qu Xiangquan
Current assignee: Qu Xiangquan
Priority date: 1990-10-27
Filing date: 1990-10-27
Publication date: 1991-04-10

Abstract

The utility model discloses a digital displaying calliper and band tape, which is formed by that a caliper rule and a band tape are combined organically. The surface of a rule band is carved with coarse raster lines which have equal intervals with black and white. One end of the rule band is provided with a measuring clamp head. The inner part of the digital displaying calliper and band tape is provided with a photoelectric conversion mechanism, a signal processing mechanism, a band coiling mechanism and a force measuring mechanism. The measurement result is showed by the mode of liquid crystal display. Batteries supplies power for the whole digital displaying calliper and band tape. The rule band is stressed and straightened in the measuring processes by the force measuring mechanism, and the error caused by the flexibility of the rule band can be compensated.

Description

Digital displaying callipers and band tape

The utility model is that a kind of metallic reflection steel band coarse grating principle that adopts adopts numeral to show the precision card tape measure of measuring big length.

Usually, employed length measurer has slide calliper rule, tape measure, milscale etc. in various productions and processing.The use of slide calliper rule is very general, if but range surpass 500mm or reach 1-2m, Chang long chi is not only made difficulty but also is cost an arm and a leg like this, especially structure heaviness, manipulate extremely inconvenience, precision also is difficult to guarantee, thereby can not get promoting in actual production and popularize.Common steel tape is owing to adopted flexible steel band, and the chi band can elongate or shorten arbitrarily by take-up case, and measurement range can reach 3-5m even longer, and volume is little, and is in light weight, operation is easy to carry, cheap, so applied range.Yet the precision of steel tape is very low, general every meter is ± 0.8mm, it (is about ± 0.08mm/m) has differed from an order of magnitude than the precision of slide calliper rule, and a groove resolution is only arranged between every mm is 1mm, like this at industrial circle, particularly automatically controlled industry, the switching motherboard industry, the great machining industry of part in addition, the precision that requires other part of processing along with technical progress is actual is all between ± 0.1～0.2mm/m, to the measurement of part in addition of big length, precision can not satisfy though the steel tape range is enough, though the slide calliper rule precision is good, range can not satisfy again, thereby exists big length for a long time always, the practical difficulty of high-acruracy survey.Present most occasion can only get by with steel tape big measurement of length, because the low parts low precision in addition that has caused production and processing of measuring accuracy, product percent of pass is low, a series of problems such as production efficiency low production difficult quality guarantee.

The purpose of this utility model is: a kind of novel measurement measurer is provided, it can comprehensive former slide calliper rule and the advantage of tape measure, realization (± 0.1～0.15mm/m) is measured approximately, is solved the difficulty that exists in the present actual production the high precision of big length (3～5mm or longer).

In order to achieve this end, digital display card tape measure has been taked following technical measures on the basis of existing technology:

1) removes scale on the former steel tape steel band, the substitute is and cut out chequered with black and white coarse grating strain line on the steel tape surface.(live width be 0.1 0.2mm or according to the request for utilization setting).

2), be provided with the measurement dop in the winding termination, it has and the similar structure of slide calliper rule head.

3), on the basis of former winding mechanism, increased force measuring machine, to eliminate the measuring error that chi band flexibility is brought.

4), in digital display card tape measure inside opto-electronic conversion is set, signal Processing, counting and display unit.

When the chi band was pulled out and taken in, photoelectric commutator was converted into electric signal with coarse grating striped chequered with black and white on the chi band, formed the plus-minus counting pulse through signal Processing, delivered to counter records and demonstrated actual measured value.

Digital display card tape measure of the present utility model has the following advantages:

1), can (3～5m) carry out precise digitization measures, and solves the difficulty of slide calliper rule linear measure longimetry to large scale.

2), exceed an order of magnitude (comprise resolution, heavily cover bearing accuracy and measuring accuracy) than tape measure on the precision.

3), volume is little, in light weight, operates easy to carry.

For structure and advantage to utility model are made clearer understanding, and will be, and be described in detail with reference to accompanying drawing in conjunction with a preferred embodiment:

Its accompanying drawing is:

Fig. 1: the front section view of a preferred embodiment of the utility model digital display card tape measure;

Fig. 2: the measurement dop of this digital display card tape measure preferred embodiment;

Fig. 3 a: rear view of the preferred embodiment;

Fig. 4: the opto-electronic conversion of the preferred embodiment, the circuit block diagram of signal Processing, counting and display part.

Can see by Fig. 1, the basic structure of a preferred embodiment of this digital display card tape measure, it is by measuring dop 1, chi band 10, photoelectric conversion section 2, pressure mechanism 3, boosting mechanism 6, take-up case 12, housing 5, and battery case 4 compositions such as grade.

Wherein the chi band 10, promptly measure band, and it is the basis of card tape measure precision, adopt steel band coarse grating manufacturing process, cut out on the steel band live width be 0.1 or 0.2mm black and white etc. between the strain line of square, this measurement is with scribes every meter of precision≤0.1-0.15mm.

Electronic surveying part by Fig. 1, Fig. 3 and Fig. 4 as seen, be made up of photoelectric conversion section 2 specialized large scale integrated circuits 8 and liquid-crystal display section 9, wherein photoelectric conversion section 2 comprises opto-electronic conversion 7, indication grating 11, form with signal pre-process part (comprising luminotron, photoelectric tube); Have definite measurement clearance in chi band 10 and the photoelectric commutator between the indication grating 11, guarantee to produce stable photosignal, after signal Processing, form the two-way displacement square-wave signal of quadrature each other; Fig. 3 is the rear view of this embodiment, wherein at the medial surface of shell 5 specialized large scale integrated circuit 8 has been installed, and it is this digital display card tape measure specialized designs and exploitation, and it can improve circuit level, and reliability reduces power consumption, and reduced volume reduces cost; Liquid-crystal display section 9 links to each other with integrated circuit 8 by lead row measurement data is made demonstration with metric system or mode made in Great Britain, and the minimum unit of display of this display is 0.01 or 0.1mm, and maximum demonstration length is 1m or 10m.

Fig. 2 has described the concrete structure of measuring dop 1 among Fig. 1, it is similar to the slide calliper rule dop as seen from the figure, move pawl 15 and decide pawl 16 and be equipped with guiding mechanism, the edge of a knife 13 and circle measuring head 14 in gauge head also comprises, these parts are to improve the critical component that this digital display card tape measure heavily covers bearing accuracy and measuring accuracy, and its technical conditions are quoted the slide calliper rule universal standard.

Force measuring machine has also been described in Fig. 1, when pressing the button of pressure mechanism 3, the chi band can freely elongate or shorten, and generally pressure mechanism 3 compresses chi band 10 all the time, guarantee that the chi band is locked under≤1.5kg power effect, when afterburning, the gear of fine setting boosting mechanism 6, the interlock take-up case forms certain tension force as being 1-1.5kg with 10 tensions of chi band to the chi band.Overcome in the measuring process because the measuring error that chi band flexibility causes.Force measuring machine is an important technique measure of this digital display card tape measure.

Fig. 4 is above-mentioned electronic surveying, signal Processing and ground, electronics display part basic circuit diagram, and it has shown the principle of work of digital display card tape measure circuit part.At first, flexible chi band 10 7 o'clock produces by opto-electronic conversion and is similar to sine-shaped photosignal, after pre-process, form the two-way pulse square wave of quadrature each other, and send integrated circuit 8 to, this specialized large scale integrated circuit segments plug-in road 83, direction judgment circuit 84 by analog to digital conversion 82, resolution is selected circuit 85, adds/down control circuit 86 and 7 compositions such as bidirectional reversible counter 87.Wherein analog to digital conversion circuit 82 and segmentation interpolating circuit 83 are in order to form the digit pulse of enough accuracy and resolution, the direction of direction judgment circuit 84 in order to determine that the digital card tape measure is pulled out or withdrawn, add/down control circuit 86 is according to above-mentioned output control signal to circuit 84, makes bi-directional counter 87 do the counting of addition or subtraction.But resolution is selected the resolution of circuit 85 preselected number video card tape measures in addition; Gauge head " D " presets the function of gauge head diameter " power " when presetting and being used to realize that with clear " O " terminal the smart zero-sum of counter 87 measured internal diameter.

Described above only is a preferred embodiment of this novel digital display card tape measure, and the utility model is not limited to this embodiment.In fact, under design of the present utility model, also can make various possible remodeling, they also belong to scope of the present utility model, for example: adopt the force measuring machine of electronics display part and card tape measure separated structures or other form and the various gauge heads that are provided with according to customer requirements etc.

Claims

1, digital display card tape measure, it is by housing, the chi band, tape mechanism, compositions such as gauge head is characterized in that: square coarse grating striped between chequered with black and white grade is carved with on the surface of described chi band (10).(live width is 0.2,0.1mm or littler); Be provided with measurement dop (1) in the end of chi band (10), it has and the similar structure of slide calliper rule head; Be provided with photoelectric commutator (2) indication grating (7) and electronic surveying part (8) liquid-crystal display section (9) in the inside of described card tape measure housing (5), at housing one end the battery case (4) of placing battery is arranged, this electric battery is given above-mentioned opto-electronic conversion and electronic section power supply; Photoelectric commutator (2) carries out opto-electronic conversion with the black and white strain line on the chi band (10), handles the formation count pulse through electronic circuit and delivers to counter (87) counting demonstrates testee on LCD (9) physical size; Force measuring machine (3), (6) can produce certain pretension to the chi band, are used for eliminating the measuring error that chi band flexibility causes, have reached thus (± 0.1～0.15mm/m) the measurement of big length (3-5 rice or longer) high precision.

2, according to the digital display card tape measure of claim 1, it is characterized in that: measure the basic structure that is provided with the interior edge of a knife (13) and circle measuring head (14) on dop (15), (16).

3, according to the digital display card tape measure of claim 1, it is characterized in that: this force measuring machine is made up of chi band pressure mechanism 3, afterburning micro-adjusting mechanism 6, and it can guarantee to form on the chi band 1-1.5 kilogram tension force in measuring process.

4, according to the digital display card tape measure of claim 1, it is characterized in that: its electronic surveying and signal processing are by photoelectric commutator (7), specialized large scale integrated circuit (8) and LCD (9) are formed, the unit of display of liquid crystal display lowest order is 0.1,0.05mm or littler, the maximum capacity of display is 1 meter or 10 meters.

5, according to the digital display card tape measure of claim 4, it is characterized in that: this specialized large scale integrated circuit (8) is by analog to digital conversion circuit (82), segmentation interpolating circuit (83), direction judgment circuit (84), resolution is selected circuit (85), add/down control circuit (86) and 7 bidirectional reversible counter circuit compositions such as (87), its connected mode is to be connected in series by said sequence substantially.