JPH05175684A - Mounting method of electronic component - Google Patents

Abstract

PURPOSE:To provide a method wherein a table is changed over at high speed in the mounting method, of electronic components, wherein the electronic components are fed to one board from two tables on which feeder have been mounted. CONSTITUTION:The histogram of the number of electronic components P to be picked up from individual feeders 15 on a table A is formed; the electronic components P which have been picked up to a transfer head 3 from the table A on one side are recognized by a recognition part Q1. When it is confirmed that the electronic components have been picked up normally, the number of said electronic components P on the histogram is subtracted. When the remaining number of the electronic components P on the histogram on the table A on one side is reduced, a table T1 on the other side is brought close to a position S1 where the supply of the electronic components on the table A on one side is to be finished so as to prepare for a changeover from the table A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component mounting method, and more particularly, to two of the multiple multi-tables provided on a moving table, which are located in an electronic component supply area. The electronic components of the feeder placed on these two tables are picked up by the transfer head, and X
The present invention relates to a method for swiftly switching between these two tables in a mounting method of electronic parts to be mounted on a board on a Y table.

[0002]

2. Description of the Related Art As an electronic component mounting apparatus for mounting electronic components on a substrate, there are provided an electronic component supply device, an XY table for positioning the substrate, and a rotary head having a transfer head for transferring and mounting the electronic components on the substrate. The configured one is widely practiced. Further, the electronic component supply device is composed of a table on which a large number of feeders such as tape feeders and tube feeders equipped with electronic components are placed, and a moving table for laterally moving the table.

In such an electronic component mounting apparatus, the electronic head of a desired feeder is picked up and the electronic component of a desired feeder is mounted on a predetermined coordinate position of a substrate positioned on an XY table while the transfer head is rotated by an index. There is.

Further, a multi-table type electronic component supply device in which a large number of tables are provided on a movable table has been proposed (Japanese Patent Laid-Open No. 1-300598). Such a multi-table type electronic component supply device moves each table independently in the lateral direction, and divides the table into a large number to reduce the weight of each table. It has an advantage that the moving speed can be increased, and the mounting speed of the electronic component on the substrate can be increased.

[0005]

As a mounting form of electronic parts in the multi-table type electronic parts supplying apparatus as described above, two out of a large number of tables are placed in the central supply area of the movable table. When mounting the electronic components on the two tables on the board on the XY table, that is, when mounting 100 electronic components on one board, the first 50 are supplied from one table. It is known that the latter 50 pieces are supplied from the other table and the mounting of electronic components on one board is completed. In this case, while one table is moved laterally, the electronic components are supplied to the transfer head, and when the supply of the electronic components from this table is completed, this table is evacuated to the side and replaced with this table. Then, the other table supplies the electronic components to the transfer head.

However, switching of such a table requires a considerable switching time (usually 1 to 1.2 seconds), and this switching time becomes a loss time, resulting in a problem that mounting efficiency is reduced.

Therefore, it is an object of the present invention to provide a mounting method of an electronic component, which can shorten the loss time at the time of switching the table as much as possible and avoid a decrease in the mounting efficiency of the electronic component.

[0008]

To this end, the present invention creates a histogram of the number of electronic parts to be picked up from each feeder on a table, and the electronic head picked up from one table by a transfer head. If the recognition unit recognizes the components and confirms that they have been normally picked up, the number of corresponding electronic components in the above histogram is subtracted, and this subtraction is repeated to determine the electronic components If the remaining number is reduced, the other table is brought closer to the electronic component supply end scheduled position of the one table, and if the electronic components of the histogram of the one table are exhausted, this one table and the other table I am trying to switch the table.

[0009]

According to the above construction, when the number of remaining electronic component histograms of one table supplying electronic components to the transfer head in the supply area becomes small, the other table is replaced with this one table. Bring them closer. Then, when the electronic components of the histogram of this one table become zero and retreat to the side, this other table immediately moves to the pickup position, and the supply of electronic components to the transfer head can be continued, and therefore the table The loss time associated with switching can be greatly reduced.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view of an electronic component mounting apparatus. 1
Is a main body box, and is provided with a rotary head 2. The rotary head 2 includes a large number of transfer heads 3. An XY table 4 is provided below the rotary head 2. The XY table 4 moves the substrate 5 in the XY directions. Reference numeral 10 is an electronic component supply device, and the detailed structure thereof will be described below.

Reference numeral 11 denotes a moving table, on which a large number of tables 12 are mounted. In this embodiment, there are eight tables 12. By dividing the table 12 into a large number of multi-tables in this manner, the weight of one table 12 is reduced, and even if the table 12 is moved on the moving table 11 at a high speed and suddenly stopped, a large vibration is caused by the shock. Is prevented, the stop position accuracy is improved, and the start-up can be started well.

As shown in FIGS. 2 and 3, the movable table 11 is provided with rails 13 in the X direction. Table 12
Is provided with a slider 14 that engages with the rail 13, and the table 12 moves laterally along the rail 13.

A feeder 15 for the electronic component P is placed on the table 12. The feeder 15 is a tape feeder, which is configured by mounting a tape supply reel 17 on a frame 16 and supplies the electronic component P stored in the tape 18 to the transfer head 3.

The transfer head 3 is provided with a nozzle 6, and at the pickup position K, the electronic component P of the feeder 15 is provided.
To pick up. As the feeder, in addition to the tape feeder as described above, a tube feeder and the like are also frequently used.

In FIG. 3, the center of the movable table 11 is a supply area A, and both sides are retreat areas B1 and B2. The supply area A is provided with two ball screws 21 and 22. Nuts 2 for ball screws 21 and 22
3 and 24 are attached (see FIG. 2), the nut 23,
Cylinders 25 and 26 are provided on 24. When the motors 27 and 28 are driven, the nuts 23 and 24 move along the ball screws 21 and 22. In FIG. 2, 3
Reference numerals 1 and 32 are sliders and rails for guiding the sliding of the nuts 23 and 24, and 33 is a base. Holes 35 and 36 are formed in the lower portion of the table 12. Cylinder 25, 2
The rods 25a and 26a of No. 6 engage with the holes 35 and 36.

When the ball screws 21 and 22 rotate while the rods 25a and 26a are engaged with the holes 35 and 36, the table 12 is pulled by the rods 25a and 26a, and the table 12 is moved in the lateral direction (X direction). Move to. That is, each of the above-mentioned constituent parts 21 to 26 is a first feeding means of the table 12. Ball screws 21, 22 and nuts 23,
The reference numeral 24 has an accurate feed accuracy, and can properly stop the predetermined feeder 15 at the pickup position K of the transfer head 3.

In FIG. 1, a timing belt 41 is provided on the side of the movable table 11. 42 is a timing pulley and 43 is a drive motor. A long bracket 44 is attached to the timing belt 41.

A cylinder 45 is attached to the bracket 44 (see also FIG. 2). Also this bracket 4
4, holes 46 are formed at a pitch for the rods 45a of the cylinder 45 to project. Further, in FIG. 2, a hole 47 is formed on the lower surface of the table 12. When the timing belt 41 rotates while the rod 45a of the cylinder 45 is engaged with the hole 47, the table 12 is pulled by the rod 45a and moves in the lateral direction (X direction). In FIG. 2, 37 and 38 are rails and sliders for guiding the movement of the bracket 44.

That is, the above-mentioned constituent parts 41 to 45 constitute the second feeding means of the table 12. This second
The feeding means 41 to 45 move the table 12 to the evacuation area B.
1, B2 is to move between the supply area A,
Therefore, the bracket 44 moves between the retreat areas B1 and B2 on both sides. Unlike the first feeding means 21 to 26, the second feeding means 41 to 45 do not require accurate feeding accuracy, and are therefore composed of inexpensive parts such as the timing belt 41.
49 is an electric cable.

2 and 3, the retreat area B1,
A cylinder 48 is provided on the side of B2. The rod 48a of the cylinder 48 presses against the side surface of the table 12, so that the table 12 being retracted is moved to the movable table 1
Fix it so that it does not move unnecessarily due to the vibration of 1. That is, the cylinder 48 serves as a fixing means for the table 12 in the retreat areas B1 and B2.

In FIG. 3, Q1 is a first recognition unit which detects whether or not the electronic component P is normally adsorbed to the lower end of the nozzle 6 by an optical means such as an optical sensor. The recognition section Q1 is similar to the means described in JP-A-61-242411. Q2 is a second recognition unit. FIG. 4 shows the recognition unit Q2, in which the camera 9 observes the electronic component P sucked by the nozzle 6 and recognizes the positional deviation.

5 (a) and 8 (b), two tables 12 (hereinafter referred to as table A,
Table B) and the change over time of the histogram of the electronic components of Table A are shown. The electronic parts P of the feeder 15 on the two tables A and B are mounted on the substrate 5 on the XY table 4. In this embodiment, ten feeders 15 (No1 to No10) are placed on the table A. This histogram is created based on the mounting program, and shows the number of electronic components P to be picked up from each feeder 15 (No1 to No10) on the table A. When the first recognizing unit Q1 or the second recognizing unit Q2 recognizes that the electronic component P is normally picked up, one corresponding electronic component P in this histogram is subtracted.

Now, FIG. 5A shows an initial state. At this time, the two tables A and B are close to each other with a small interval t. This small interval t is a safety interval ensured for avoiding collision between the two tables A and B. Now, one table A is moved from the position shown in FIG. 5A to the supply start position shown in FIG. 6A. In this embodiment, first, the electronic component P of the No. 4 feeder 15 is supplied to the transfer head 3. Next, while reciprocating the table A in the lateral direction (X direction), the feeder 15 having the desired electronic components P is sequentially stopped at the pickup position K, and the electronic components P are sequentially supplied to the transfer head 3.

The transfer head that picks up the electronic component P from the nozzle 6 transfers the electronic component P to the substrate 5 on the XY table 4 while rotating the index, and in the middle of the process, the first recognition unit Q1 It is confirmed whether or not the electronic component P is normally adsorbed to the nozzle 6, and if it is normally adsorbed, the number of histograms of the corresponding electronic component P is subtracted by one. Next, this electronic component P is observed by the second recognition unit Q2, and the positional deviation in the XYθ directions is recognized. Of the positional deviations in the XYθ directions, XY
The positional deviation in the direction is corrected by adjusting the movement stroke of the substrate 5 in the XY directions, and the positional deviation in the θ direction is corrected by rotating the nozzle 6 by θ, and then the electronic component P is mounted on the substrate 5. Mount. In this way, every time the recognition unit Q1 recognizes that the electronic component P is normally picked up, the number of corresponding electronic components P in the histogram is subtracted one by one.

FIG. 7A shows a state in which the electronic component P of the No. 10 feeder 15 is picked up.
As shown in FIG. 7B, in this state, the subtraction is repeated, so that the electronic components P of the feeders No. 1 to No. 8 are zero. Further, in this state, the electronic component P of the No. 10 feeder 15 will soon become zero, and subsequently the electronic component P of the No. 9 feeder 9 will also become zero, and all histograms of the electronic component P of one table A will become zero. It turns out that the timing, that is, the time to switch the table A to the table B, will come soon. Further, in this table A, the No. 9 feeder 15 that finally supplies the electronic component P to the transfer head 3 is positioned at the pickup position K, and the electronic component supply end scheduled position of the table A (the histogram of the electronic component P is all zero). The end surface position S1 at the position (at which) becomes easily known from the known data such as the dimensions of the table A. Therefore, the other table B, which has been waiting on the side until then, is moved to the approach position S on the right side.
Slide to 2 and prepare for switching between table A and table B. At this time, the distance between the positions S1 and S2 is the small distance t.

Then, the last No. 9 feeder 15 on the table A is stopped at the pickup position K (see FIG. 8).
(A)) When the electronic parts P of this feeder 15 are picked up by the transfer head 3 and all the electronic parts P of the histogram of the table A become zero, the table A is evacuated to the lateral evacuation area B2. , The other table B moves to the pickup position K, and the supply of the electronic component P to the transfer head 3 is continued. As described above, according to this method, when the supply of the electronic component P from the one table A is near the end and the switching timing of the table A and the table B is near, the other table B is brought close to the table A. Therefore, the switching from the table A to the table B can be performed in an extremely short time (for example, about 0.3 seconds), and the loss time for the switching can be remarkably shortened. Of course, the approaching operation of the table B may be started early.

The reason why the number of histograms is subtracted after the recognition section Q1 recognizes that the electronic component P is normally adsorbed is as follows. That is, the electronic component P of the feeder 15 may not be normally sucked by the nozzle 6, but may be sucked in a standing posture, for example. In such a case, the mounting of the electronic component P on the substrate 5 is stopped, and the nozzle 6 of the other transfer head 3 picks up the electronic component P from the feeder 15 again and mounts it on the substrate 5. Such an operation is generally called recovery.
Therefore, in this method, the recognition unit Q1 recognizes that the electronic component P is normally adsorbed, confirms that the electronic component P is mounted on the substrate 5 as scheduled, and then subtracts the histogram. ing. Of course, the subtraction may be performed after the electronic component P is recognized by the second recognizing unit Q2, and which recognizing unit recognizes is arbitrary. However, recognizing as early as possible will accomplish the work. It is desirable that the recognition is performed by the first recognition unit Q1, which is the recognition unit on the upstream side.

FIG. 9 is a flowchart of the above operation. In step 1, histograms of all the tables 12 are created. In step 2, the recognition part Q1 or Q2 recognizes the electronic component P. In step 3, it is selected whether or not the pickup of the current table (table A in this embodiment) is completed. Next, if the recognition is normal, the histogram is subtracted (steps 4 and 5) and the table (table B in this embodiment) is selected to be accessible. If NO, the process returns to step 2, the above operation is repeated, and if YES, the table B approaches the table A (step 7). This approach interval is a small interval t as described above. If an abnormality is detected in step 4, the above-mentioned recovery is performed and error processing is performed. If YES in step 3, it is selected in step 8 whether or not all tables have ended, and N
If it is O, switch tables and return to step 2, YE
If S, the program becomes END.

[0029]

As described above, according to the present invention, when the number of remaining histograms of electronic components in one table in the supply area where the electronic components are supplied to the transfer head is reduced, the electronic components are reduced. The time when the histogram of 0 becomes zero, that is, the table switching time and the electronic component supply end scheduled position of this table at that time are known, so the other table in standby is brought close to this one table, When the histogram of the electronic components becomes zero and is evacuated, the other table immediately moves to the pickup position and the supply of electronic components to the transfer head can be continued, greatly reducing the loss time when switching tables. However, the mounting efficiency of electronic parts can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an electronic component mounting apparatus according to the present invention.

FIG. 2 is a partial side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of the same portion.

5A is a plan view of the table, and FIG. 5B is a histogram view.

6A is a plan view of the table, and FIG. 6B is a histogram view.

FIG. 7A is a plan view of the table, and FIG. 7B is a histogram view.

8A is a plan view of the table, and FIG. 8B is a histogram view.

FIG. 9 is a flowchart of the same.

[Explanation of symbols]

 3 Transfer Head 4 XY Table 5 Substrate 6 Nozzle 11 Moving Table 12 Table 15 Feeder A Supply Area P Electronic Component Q1 Recognition Unit Q2 Recognition Unit S1 Electronic Component Supply Scheduled Position

Claims (1)

[Claims] 1. A mobile table is provided with a multi-table, and two of these multi-tables are located in a central supply area of the mobile table, and electronic parts of a feeder on the two tables are placed. Is picked up by the transfer head, and the transfer head is index-rotated, so that the electronic components of the feeder on the two tables are moved in the XY direction.
In a method of mounting electronic components mounted on a substrate on a table, an electronic component picked up by the transfer head from the one table is recognized by a recognition unit provided in the middle of the moving path of the transfer head. Then, if it is confirmed that the electronic components have been normally picked up, the number of the corresponding electronic components in the histogram of the number of electronic components to be picked up from each feeder on the above table is subtracted, and this subtraction is performed. Repeatedly, if the number of remaining electronic components in the histogram of one of the above tables decreases,
The other table is brought closer to the electronic component supply end position of the one table, and if the electronic components of the histogram of the one table are exhausted, the one table and the other table are switched. And a method for mounting electronic components.