JPH0514810U - Printed wiring board double input detector - Google Patents

Abstract

(57) [Abstract] [Purpose] Detects handling of printed wiring boards and overlapping due to defective transport, and prevents the occurrence of equipment failures, transport problems, and stains in the processing tank in the subsequent processes. [Structure] A first coil head 3 for generating a magnetic field and the first coil head are provided above a transport mechanism 2 of a printed wiring board 1 having copper foil on both sides.
It has the 2nd coil head 4 which measures the magnetic flux density arranged facing coil head 3, and measures the magnetic flux density according to metal thickness. [Effect] It becomes possible to detect a thin substrate that cannot be detected by the conventional method, and the above trouble can be prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double throw detection device, and more particularly to a thin printed wiring board double throw detection device.

[0002]

[Prior Art]

 As shown in FIG. 2, the transport mechanism 2 of the conventional double-feed detection device rotates in the transport direction, and the lower roller 5 rotates in the transport direction like the lower roller 5 and can be displaced in the vertical direction. The upper roller 6 is provided with a limit switch 7 for detecting the amount of displacement on the upper roller 6, and the thickness of the printed wiring board 1 is measured by the displacement of the upper roller 6 to detect double insertion. Was to do.

[0003]

[Problems to be solved by the device]

 With such a conventional double-feeding detection device, since a roller is used as a detection medium, the eccentricity of the roller cannot be reduced to 0 due to the restriction of machining accuracy, and when the roller rotates, the upper roller 6 Slides in the vertical direction, and it is not possible to accurately detect double insertion of a thin printed wiring board with a thickness of 0.1 mm or 0.2 mm, and in the unlikely event that a detection failure occurs, the device will malfunction in the subsequent process. However, there were problems such as transport problems and stains in the processing tank.

An object of the present invention is to provide an apparatus for accurately detecting double insertion of a printed wiring board without contact.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the printed wiring board double throwing-in detection device according to the present invention, a transport mechanism for transporting the printed wiring board with copper foil on both sides to be detected at a predetermined speed, and the transport mechanism It has a coil head arranged above and generating a magnetic field, and a magnetic flux density measuring coil head arranged so as to face the coil head.

[0006]

[Action]

 The combination of both coil heads constitutes an eddy current type proximity switch, and when the printed wiring boards that pass between them are overlapped, they are generated in the detection metal in proportion to the increase in the thickness of the metal part. The magnetic flux density due to the eddy current increases.

[0007]

【Example】

 Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of the present invention.

Referring to FIG. 1, a double-feeding detecting device according to the present invention is a transport mechanism 2 for transporting a double-sided copper foil-clad printed wiring board 1 forward, and a magnetic field arranged above the transport mechanism 2. The first coil head 3 and the second coil head 4 for measuring the magnetic flux density arranged so as to face the first coil head 3 are provided.

Next, the operation of the double injection detecting device according to the present invention will be described.

The combination of both coil heads 3 and 4 constitutes an eddy current type proximity switch. When a metal is detected by this switch, if the thickness of the metal portion increases, the eddy current generated in the detected metal causes The magnetic flux density increases. The double injection detecting device according to the present invention utilizes this characteristic.

Normally, as shown in FIG. 1, the printed wiring boards 1 advance on the transport mechanism 2 one by one. At this time, the magnetic flux density generated by the copper foil on the front and back surfaces of the printed wiring board 1 is measured by the first coil head 3 and the second coil head 4. The magnetic flux density at this time is B1.

Next, as shown in FIG. 3, it is assumed that two printed wiring boards 1 are overlapped and conveyed by the conveyance mechanism 2 between the first coil head 3 and the second coil head 4 due to conveyance failure or the like. At this time, the magnetic flux density generated by the copper foils on the front and back surfaces of the printed wiring board 1 between the first coil head 3 and the second coil head 4 is measured. The measured value B2 at this time has a relationship of B1 <B2 from the phenomenon that the magnetic flux density increases as the metal thickness increases as described above. When B1 <B2, an alarm is issued and the operation of the transport mechanism 2 is stopped.

Needless to say, the characteristics of this device can be used to measure the copper foil thickness of the printed wiring board 1.

[0014]

[Effect of the device]

 As described above, according to the present invention, the combination of the first coil head that generates the magnetic field and the second coil head that is arranged facing the first coil head and that measures the magnetic flux density prints on the transport mechanism. There is an effect that the double insertion detection of the thin printed wiring board can be performed continuously without contact without being influenced by the warp of the wiring board and the like without contact.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing a conventional double throwing detection device.

FIG. 3 is a side sectional view showing a double charging state.

[Explanation of symbols]

 1 Printed Wiring Board 2 Conveying Mechanism 3 First Coil Head 4 Second Coil Head 5 Lower Roller 6 Upper Roller

Claims (1)

[Scope of utility model registration request] 1. A transport mechanism for transporting a printed wiring board with copper foil on both sides, which is an object to be detected, at a predetermined speed; a coil head disposed above the transport mechanism to generate a magnetic field; A double insertion detecting device for a printed wiring board, characterized in that it has a magnetic flux density measuring coil head arranged facing each other.