JPH04352400A - Recovery method of electronic parts automatic insertion machine - Google Patents

Abstract

PURPOSE:To increase the non-defective rate of a printed board to improve workability by observing the state of electronic parts which have failed in an automatic insertion into the printed board, when the automatic insertion of the parts has failed in an electronic parts automatic insertion machine, by conducting again the insertion of the electronic parts, if possible, and by conducting no insertion of the parts and restarting the insertion from the next parts, only when such insertion is impossible. CONSTITUTION:A printed board is positioned by X-Y table 1, the excessive part of the lead wire of electronic parts is cut off by anvil part 2, and further a voltage generated by the strain of a piezoelectric element stuck on the anvil part 2 due to a stress generated in the anvil part 2 at the time of clinching is detected for the purpose of determining whether insertion has succeeded or failed. When the insertion is determined to have failed, a parts insertion part, where the insertion has failed, is examined by an optical recognition part 3, and when the insertion is determined as possible, the parts are again inserted in that position and when the insertion is impossible, the insertion of the parts is restarted from the next position.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recovery method when a component insertion failure occurs in an electronic component automatic insertion machine that automatically inserts electronic components into a printed circuit board.

0002

[Prior Art] Conventionally, automatic electronic component insertion machines have been provided with a recovery function that causes the insertion operation of the failed component to be performed again when the insertion of the component fails.
A method has been adopted in which an operator visually inspects the condition of the failed insertion part, manually removes the failed insertion part, and performs a manual recovery operation.

[0003] Therefore, in the case of unmanned operation at night, if a component insertion failure occurs, there is no means to investigate the condition of the failed component, so as shown in FIG. A skip operation was performed in which the insertion operation was resumed from the next insertion position by leaving the insertion position as it was.

That is, in FIG. 3, when operation is started and electronic components are inserted into the printed circuit board (step a)
, the anvil section operates to cut off the excess portion of the lead wire and clinch it (step b). A piezoelectric element is attached to the anvil part, and the piezoelectric element generates a strain voltage due to stress during clinching after cutting the lead wire, so the output voltage is measured (step c), and the output voltage is a constant value. If it is below, it is determined that insertion of the electronic component has failed (step d). If the insertion fails, the insertion of that component is skipped (step e), and it is checked whether there are any more electronic components to insert (step g). If there are any electronic components to insert, return to step a and insert the next electronic component. I do. On the other hand, even if it is determined in step d that the electronic component has been successfully inserted, it is checked whether there is a component to be inserted next (step f).
, if there is a component to be inserted next, return to step a and insert the next electronic component. If it is determined that there is no component to be inserted next, the operation of inserting the electronic component into the printed circuit board is finished.

[0005] In this way, if the electronic component insertion machine is connected to a higher-level computer, the printed circuit board for which the component insertion was skipped due to a failure in the insertion of the electronic component will be processed by the higher-level computer. The affected printed circuit board and the position of the failed component insertion were memorized and recorded, and rework was carried out at a later date.

[0006]

[Problems to be Solved by the Invention] With such conventional methods, it is not possible to automatically check the status of failed insertion of parts onto the printed circuit board, so if the recovery operation is forced, the parts that failed to be inserted will interfere with the printed circuit board. In order to damage the insertion head of the automatic board or electronic component insertion machine, a skip operation was performed without automatic recovery. As a result, the number of printed circuit boards subjected to the skip operation increases, requiring a large amount of time for rework at a later date, resulting in a problem in that work efficiency is significantly reduced.

[0007] The present invention aims to solve the above problem, and includes a recovery operation that automatically detects the state of a component that has failed to be inserted into a printed circuit board and re-inserts the electronic component if possible. The purpose is to improve work efficiency.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the recovery method of the automatic electronic component insertion machine of the present invention is such that when an electronic component is inserted into a printed circuit board, the lead wire of the electronic component is cut and then the lead wire is removed. An insertion detection process that measures the stress generated in the anvil part when clinching the wire and determines whether the electronic component has been correctly inserted into the printed circuit board or has failed based on the magnitude of the stress, and the insertion detection process that detects insertion failure. If it is determined that there is no electronic component at the component insertion position on the printed circuit board, the component condition determination step is to observe the condition of the component using an optical recognition device and determine the presence or absence of the component in the insertion. If it is determined, the electronic component is reinserted, and if it is determined that there is a component at the insertion position on the printed circuit board, control is performed such that a skip operation is performed in which the electronic component is not reinserted.

[0009]

[Operation] According to the recovery method of the automatic electronic component insertion machine of the present invention described above, a failure in insertion of an electronic component into a printed circuit board is detected in the insertion detection step, and an optical recognition device detects the failure in insertion in the component state determination step. Observe the insertion position of the component that caused the insertion failure on the printed circuit board, and check whether the component that caused the insertion failure remains in a position that will prevent the component from being reinserted, and whether the insertion hole is blocked. judge,
If it is determined that re-insertion is possible, the re-insertion operation of the component is performed at the component position where the insertion failed. If a component that was previously inserted unsuccessfully remains at the component re-insertion position on the printed circuit board and it is determined that the re-insertion operation of the component will be hindered, the component will not be re-inserted at that position. ,
Executes insertion from the next component insertion position.

According to the recovery method for an automatic electronic component insertion machine of the present invention, the automatic electronic component insertion machine can continue to operate without stopping, and the rate of good printed circuit boards without missing components can be improved. It is possible to improve productivity.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A recovery method for an automatic electronic component insertion machine according to the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a radial electronic component inserter employing the recovery method of the present invention. In Figure 1, 1 is
Y table, 2 is anvil part, 3 is optical recognition device, 4
is a built-in controller.

In the radial electronic component insertion machine shown in FIG. 1, first, the XY table 1 on which the printed circuit board is mounted operates based on the numerically controlled program data built into the controller 4, and the printed circuit board is positioned at a predetermined position. death,
Lead wires for electronic components are inserted at that position. The lead wire of the electronic component inserted into the printed circuit board is cut off by the anvil portion 2, and the remaining portion of the lead wire is clinched. Such operations are repeated until all predetermined electronic components are inserted onto one printed circuit board.

On the other hand, a piezoelectric element is attached to the anvil part 2, and when the lead wire is cut and clinched, stress generated in the anvil part 2 causes distortion in the piezoelectric element, and a voltage is generated in the piezoelectric element. If the lead wires of the electronic components are correctly inserted into the printed circuit board, the piezoelectric element attached to the anvil portion 2 will be distorted when the lead wires are cut and clinched, and a voltage will be generated in the piezoelectric element. Therefore, by measuring this voltage, it is possible to determine whether the electronic component has been inserted correctly or has failed, depending on the presence or absence of the voltage. If it is determined that the electronic component has been inserted normally, the XY table 1
moves and inserts the next electronic component.

The optical recognition unit 3 measures the position of the electronic component insertion hole on the printed circuit board during normal electronic component insertion, corrects the numerical data of the numerical control program, and positions the printed circuit board at a more correct position. The XY table 1 is controlled as follows.

Next, the recovery method of the present invention in an electronic component automatic insertion machine will be explained with reference to FIG. In FIG. 2, A is an insertion detection process, B is a component state determination process,
C is a motion determination step.

First, in the insertion detection step A, the printed circuit board is positioned using the XY table 1, and electronic components are inserted into the printed circuit board (step a). Next, the anvil portion 2 operates to cut and clinch the lead wire (step b). At the same time, the output of the piezoelectric element attached to the anvil part 2 is measured (step c), and based on the determination result, it is determined whether or not there has been a failure in insertion of the lead wire. ) or one lead wire (one leg) (step d), and if the insertion failure is only in one leg, it is determined which lead wire, for example, the right leg or the left leg (step e). If it is determined in step d that the insertion is OK, it is checked whether there are any more parts to be inserted (step f), and if there are any more parts to be inserted, the process returns to step a and the next part is inserted. If there is no component to be inserted next, inserting the component into the printed circuit board is finished.

If the determination in step d is that the insertion has failed, then the component state determination step B is performed based on the information on the insertion failure.
First, the XY table 1 is operated according to the content of the insertion failure to move the lead wire insertion hole on the printed circuit board to the position below the optical recognition unit 3 (step g).
, it is determined whether the insertion hole is clogged with components or whether there are any electronic components remaining in the vicinity of the insertion hole (step h).

In the operation determination step C, the component state determination step B
It is determined whether the component can be re-inserted based on the determination in (step i), and the insertion hole is not clogged with the component.
In addition, if there are no parts that will get in the way of the re-insertion position of the electronic component, the XY table 1
The position of the printed circuit board is corrected by , the insertion operation speed is slowed down (step j), and the component is slowly reinserted (
Step k). If it is determined in step i that it is not possible to reinsert the part, a skip operation is performed that does not reinsert the part (step l), and it is checked whether there are any more parts to be inserted (step m). If there is a component to be inserted next, the process returns to step a and inserts the next component, and if there is no component to be inserted next, the component insertion into the printed circuit board is finished.

[0020] In the case of one leg insertion failure, determining which side of the lead wire caused the insertion failure and checking the presence or absence of parts is based on checking for erroneous detection due to erroneous contact between the printed circuit board and the anvil portion 2. This is to find out.

Although the automatic insertion machine in this embodiment has been described above as an automatic insertion machine for radial electronic components, this recovery method is also effective in automatic insertion machines for axial electronic components or odd-shaped electronic components.

[0022]

[Effects of the Invention] As is clear from the above explanation, conventionally, during unmanned operation at night, skip operations were performed in response to failures in the insertion of all electronic components, which required a large amount of man-hours for later modifications. According to the method of the present invention, by determining the state of electronic component insertion failure, the electronic component is re-inserted if it is possible, thereby increasing the ratio of non-defective boards and eliminating rework at a later date. The number of man-hours can be reduced, and the productivity of the automatic electronic component insertion machine can be improved.

[Brief explanation of drawings]

[Fig. 1] External perspective view of an automatic electronic component insertion machine that employs an embodiment of the recovery method of the present invention.

[Figure 2] Operation flow diagram showing the recovery method of the present invention in an electronic component automatic insertion machine

[Figure 3] Operation flow diagram of a conventional electronic component automatic insertion machine

[Explanation of symbols]

1 XY table 2 Anvil part 3. Optical recognition device 4 Controller

Claims (1)

[Claims] [Claim 1] After mounting an electronic component on a printed circuit board and cutting the lead wire of the electronic component, the stress generated in the anvil part is measured when clinching the lead wire, and depending on the magnitude of the stress, the electronic component can be properly attached to the printed circuit board. An insertion detection step that determines whether the insertion has been inserted or the insertion has failed, and a component status that uses an optical recognition device to observe the state of the component and determine the presence or absence of the component at the insertion position if it is determined that the insertion has failed in the insertion detection step. If it is determined in the component status determination step that there is no electronic component at the insertion position on the printed circuit board, the electronic component is re-inserted, and if there is an electronic component at the insertion position on the printed circuit board, the electronic component is re-inserted. A recovery method for an automatic electronic component insertion machine that is controlled to perform a skip operation without reinsertion.