JPH034111A - Length measuring instrument and length measurement selecting device - Google Patents

Abstract

PURPOSE:To measure the length of a body to be measured without contacting by calculating the length of the body to be measured from the sum of length values of respective parts of the body to be measured which are detected by respective area sensors, and the lengths of inside intervals between detection areas of the respective area sensors. CONSTITUTION:Works 10 which are arrayed and supplied from a parts feeder 2 are conveyed by a conveyor 3 in the lengthwise direction and passed between the area sensor 4 consisting of a projector 4 and a photodetector 4b and the area sensor 5 consisting of a projector 5a and a photodetector 5b to generate a detection signal. Then, the detecting signal is processed in a controller 7 to find the length of the works 10. This length is compared with a previously set reference size in the controller 7 to decide whether or not the length is normal and the works are selected through selection chutes 8a - 8c. Thus, the length of the body to be measured can be measured without contacting.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a measuring device and a measuring device capable of measuring the length of parts such as mechanical parts and electrical parts with high accuracy regardless of the moving speed. The present invention relates to a measuring and sorting device for sorting the first constant object based on the constant result.

(Prior Art) Conventionally, as this type of length a1 determining device and length measuring and sorting device, devices mainly using a contact type sensor have been used.

However, in a device using such a contact type sensor, (1) Powder, dirt, etc. adhere to the contact of the sensor, which is added to the dimension of the Δ-1 constant and is determined by n1, resulting in a large dimension.

■ Damage to the object to be measured caused by the contact.

■ Contamination of the measured object due to adhesion of iron, oil, etc. occurs.

There were drawbacks such as.

On the other hand, place an area sensor with a detection area (set light beam width for photoelectric type, detection coil size for electromagnetic type) larger than the length of the measured object on the conveyance path of the measured object.
A non-contact type (electric type) that determines the length of the object to be measured by d-1 from an analog signal corresponding to the shielding length generated when the Ap1 fixed object shields the detection area. Length Δ-1 constant devices are also known.

However, this device has a drawback that the range in which JF1 can be determined is narrow because the width of the detection area of the area sensor is limited.

Furthermore, there is also a known device that determines the length from the time it takes for the object to pass between the start and end of the object while keeping the conveyance speed constant; however, with this device, the conveyance speed cannot be changed as necessary, and There was a problem that errors occurred due to

(Problems to be Solved by the Invention) The present invention has been made in order to eliminate the drawbacks of such conventional devices.
The dimensions of the object to be measured of any length, regardless of the moving speed.
Length jl11 which can be determined with high precision and length 1l
The purpose of the present invention is to provide an 11 constant sorting device.

[Structure of the Invention] (Means for Solving the Problems) The length lid device of the present invention has a conveyance means for conveying the objects to be measured one by one, and an inner interval between the detection area is 111I.
Two area sensors are arranged along the conveyance path of the conveyance means such that the outer interval is longer than the length of the fixed object and shorter than the length of the object to be measured, and the object to be measured is detected by each area sensor. It is characterized by comprising a calculation device that calculates the length of the object to be measured from the sum of the lengths of each end of the object and the length of the inner interval between the detection areas of each area sensor, and The length measuring and sorting device of the present invention has the above-mentioned length n1
a selection signal generation device that compares the output of the calculation device with a base I$ value and generates a selection signal for the object to be measured;
The present invention is characterized by comprising a sorting means for sorting the object to be measured based on the sorting signal of the sorting signal generator.

(Function) In the length 7N-1 fixing device of the present invention, j When both ends of a constant object are located within the detection area of each area sensor, the characteristics of both area sensors are the same, or if they are made the same, the sum of their analog outputs is - or the length of one constant object. It will be a constant value depending on. Since this value remains constant as long as both ends of the object to be measured are located within the detection areas of both area sensors, the output value does not change even if the conveyance speed of the object to be measured changes.

If this output value is converted into a length, the length of the Δ-1 constant object is represented by the sum of this converted length and the distance between both detection areas. Therefore, if the distance between both area sensors is adjusted according to the length of the object to be measured so that both ends straddle both detection areas, what length of object can be measured? It can also deal with one constant.

Further, in the length measuring and sorting device of the present invention, the output of the arithmetic unit of the length measuring device is compared with a reference value to generate a sorting signal for m-measured objects, and based on this sorting signal, the Objects are sorted according to length.

(Example) Hereinafter, an example of the length aF1 constant sorting device of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view of this embodiment, Fig. 2 is an explanatory diagram showing the measurement principle in this embodiment, Fig. 3 is an explanatory diagram showing the relationship between length and Apl fixed time in this embodiment, and Fig. 4 is an explanatory diagram showing the relationship between length and Apl constant time in this embodiment. A timing chart showing the relationship between the timing of measurement time and counting time, and FIG. 5 is an explanatory diagram showing the arrangement of area sensors in another embodiment.

This implementation row length Δ-1 constant sorting device 1 includes a parts feeder 2, a conveyor 3, a first area sensor 4, a second area sensor 5, a distance setting device 6 between area sensors, a controller 7, and a sorting chute 8. It consists of Further, the inner distance between each detection area of the first area sensor and the second area sensor is set shorter than the length of the workpiece 10, and the outer distance is set longer. These area sensors are arranged along the conveyance path of the conveyor 3.

In this device, workpieces 0 aligned and fed from a parts feeder 2 are transported by a conveyor 3, which is a transport device, with the length direction facing the traveling direction, and are transported to a first area sensor consisting of a light emitter 4a and a light receiver 4b. 4 and also the floodlight 5
a and a second area sensor 5 consisting of a light receiver 5b to generate a detection signal.

The detection signal is processed and calculated in the controller 7 to determine the length of the workpiece 10. This length is compared with the M1 dimension set in advance in the controller 7, and after determining the quality, the selection chute 8a-8b s8c are sorted through.

Here, the principle of constant length 4-1 and signal processing in the present invention will be explained.

In FIG. 2, the detection area X1 of the first area sensor
If the length that the work 10 shields in is Xl, the length that the work 10 shields in the detection area X2 of the second area sensor is x2, and the interval between the first area sensor and the second area sensor is A. The length of the workpiece is given by the following formula.

L-x1+A+X2 In other words, the length of the workpiece is the length that the workpiece covers the detection area X1 of the first area sensor and the detection area X2 of the second area sensor xl, x2, and detection area X +
, X 2 is expressed as the sum of the distances #A.

Next, the relationship between the progress status of the workpiece and the timing of the generated signals will be explained.

As shown in FIG. 3, the time when the workpiece 10 moves in the direction of the white arrow and enters the detection area 1 of the first area sensor X1 is defined as Ta. As shown in FIG. 4, from this point on, the area sensor X1 outputs an analog signal. Work 1
0 sequentially progresses within the detection area X1 and then enters the detection area x2, the area sensor X2 also outputs an analog signal.

Then, the time Te from the time Tb when the tip enters the length measurement zone β2 to the time Tc when the tip exits from the 4#1 length zone β2
The length of each of the analog signals mentioned above is measured using sampling pulses, and the average value of the I91 length results during that time is taken as the length of the workpiece 10.

Note that the n1 length zone 12 is an area provided to prevent the signal from becoming unstable at the boundary of the detection area X1. For example, when using an area sensor in which O~5　1 corresponds to O~5v, length measurement is started at position l11 and apj length is ended at position 4n.

Note that the interval between the first and second area sensors is
Area sensor spacing j! lAdjustment knob 6a and adjustment screw 6
It can be adjusted using b, and depending on the length of the workpiece to be determined, 5! so that when the front end of the workpiece is within the measurement zone β2, the rear end is within the detection area X1! Section J is made.

The length of the workpiece thus determined is compared with a preset reference dimension, and one of the sorting chutes 8a, 8b, and 8c is selected based on the result.

Incidentally, using the apparatus of this embodiment, the reference work 21.
The results obtained using 999 Pengen, 21.503 m- have a repeatability of 0. (Lams had a processing capacity of about 60 pieces/minute or more for 221 layers and 0 pieces.

FIG. 5 shows another embodiment, in which the symbols have the same meanings as in FIG. 1. In the same figure, (a)
(b) shows a case where a falling object is measured by a magnetic area sensor, and (b) shows a case where a magnetic workpiece is measured with a magnetic area sensor.

Note that in the actual Kl described above, the case where IN is determined while moving the workpiece 1o has been described, but the present invention is not limited to such an embodiment, and even when the workpiece is in a stopped state, the length can be determined. A 2-1 constant can be performed.

[Effects of the Invention] The length measuring device of the present invention measures the distance along the conveyance path so that the inner interval between the detection areas is longer than the length of the object to be measured Δp1, and the outer interval is shorter than the length of the object to be measured. Using two area sensors arranged, the length of the object to be measured is calculated from the length of both ends of the object measured by these area sensors and the length of the inner interval between the detection areas of each area sensor. Therefore, the length Al1 of the Δ-1 constant that exceeds the length of the detection area of the area sensor can be determined without contact, regardless of the conveyance speed.

Further, the length measuring and sorting device of the present invention performs the sorting based on the 7111 results of the above-mentioned 111 sorting device, so it is possible to perform highly accurate sorting.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of a length Δ-1 constant sorting device according to the present invention, and FIG. 2 is a perspective view of an embodiment of the length Δ-1 constant sorting device according to the present invention. FIG. 3 is an explanatory diagram showing the relationship between length and measurement time in an embodiment of the present invention; FIG. 114 is a timing chart showing the relationship between measurement time and timing of counting time; FIG. (a) and (b) are explanatory diagrams each showing the arrangement of area sensors in other embodiments. 3... Conveyor 4... First area sensor 5...
. . . Second area sensor 6 . . . Inter-area sensor interval setting device 7 . . . Controller 8 . . . Sorting chute 10. ·····work

Claims (2)

[Claims] (1) A conveying means that conveys the objects to be measured one by one, and a conveying means that conveys the objects to be measured one by one, and the conveying means so that the inner interval between the detection areas is longer than the length of the object to be measured, and the outer interval is shorter than the length of the object to be measured. From the two area sensors arranged along the conveyance path, the sum of the lengths of each end of the object to be measured detected by each area sensor, and the length of the inner interval between the detection areas of each area sensor, 1. A length measuring and sorting device capable of measuring the length of an object to be measured irrespective of conveyance speed, characterized by comprising a calculation device for calculating the length of an object to be measured. (2) A conveying means for conveying the objects to be measured one by one, and a conveying means configured such that the inner interval between the detection areas is longer than the length of the object to be measured, and the outer interval is shorter than the length of the object to be measured. From the two area sensors arranged along the conveyance path, the sum of the lengths of each end of the object to be measured detected by each area sensor, and the length of the inner interval between the detection areas of each area sensor, an arithmetic device that calculates the length of the object to be measured; a sorting signal generator that compares the output of the arithmetic device with a reference value to generate a sorting signal for the object to be measured; and a sorting signal of the sorting signal generator. 1. A length measuring and sorting device capable of measuring and sorting the length of an object to be measured irrespective of a conveyance speed, characterized in that the device is equipped with a sorting means for sorting the object to be measured based on the conveyance speed.