JPH0787276B2 - Electronic component mounting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting electronic parts, and more particularly to a means for smoothly mounting electronic parts by setting idle feed necessity information of a transfer head.

[0002]

2. Description of the Related Art As a means for mounting electronic parts such as ICs and resistance chips on a substrate at high speed, a plurality of transfer heads are index-rotated along a rotary head to pick up electronic parts from a parts feeder, and XY A technique of mounting this electronic component on a substrate positioned on a table is widely used.

By the way, when this means is used, it is necessary to coordinate the index rotation of the transfer head with the operation of the parts feeder. Of these, the transfer head usually rotates at a constant speed along the rotary head,
Electronic parts are picked up from the parts feeder at a fixed position (pickup station) on the parts feeder side. Also, there are many types of electronic components to be mounted on the board. Therefore, usually several tens to several hundreds of parts feeder groups are provided on the moving table, and by driving this moving table, the corresponding one of the above-mentioned many parts feeders is positioned at the transfer head to the pickup station. I'm supposed to let you.

As described above, it is necessary to perfectly coordinate the operations of the transfer head and the parts feeder, but in reality, as shown below, these operations cannot be coordinated and mounting is impossible. May be

FIG. 5 and FIG. 6 are explanatory views of such a case where mounting is impossible. In the figure, H is a transfer head, N is a nozzle of this head H, QP is a pickup station of this head H, U is a parts feeder, 100 is a guide member of this parts feeder U, 101 is a guide member 100.
A sprocket provided on the front part of the electronic component encapsulating tape 103 for feeding the electronic component encapsulating tape 103, an arm 103 that swings when the elevating rod 110 ascends and descends in the direction of the arrow N1,
(B) and (c)) are the pockets of the tape 103,
Reference numeral 104 denotes a link mechanism that transmits the swing of the arm 102 to the sprocket 101 and feeds the tape 103 to the sprocket 101 by a pitch, and 105 is a return spring of the link mechanism 104.

Now, in FIG. 5A, the lifting rod 11
When 0 moves up and down in the direction of arrow N1, the arm 102 swings between the solid line position and the chain line position, and the sprocket 101 feeds the tape 103 by a predetermined pitch. However, when the size of the electronic component P increases,
The electronic component P is picked up by the nozzle N (see FIG. 5).
After (b)), if the elevating rod 110 moves up and down only once, as shown in FIG. 5C, the next electronic component P may not be sent to the pickup station QP.
In this case, the pick-up operation by the transfer head H is paused once, and the elevating rod 110 is moved up and down again.
It is necessary to feed the tape 103 to the position shown in (b).

Further, as shown in FIG. 6, when the transfer head H tries to perform a pickup operation to the parts feeder U1 of the pickup station QP, it moves to the same station QP and swings the parts feeder U2 to receive the pickup. The arm 102 is pushed down by the elevating rod 110, and the electronic component P is prepared in advance so that it can be picked up (so-called advance feed) to minimize the loss time due to the switching of the parts feeder. However, as shown by the distance L in FIG. 6, the range in which this advance can be performed is normally the pickup station QP.
To within a certain range. Therefore, when picking up from the parts feeder U3 that exceeds the range next time, this advance feed cannot be performed, and a loss time corresponding to that is generated, so that it becomes difficult to continuously perform the pickup operation.

Further, there is a limit to the torque of the drive system for driving the index rotation of the transfer head H, and when the moving table on which the parts feeder U is placed moves greatly, even if this drive system is fully decelerated. In some cases, the operation of the transfer head H cannot be synchronized with the operation of the parts feeder U.

However, in the conventional means, when the electronic component is actually mounted and a mounting error occurs, the recovery operation of remounting the electronic component is repeated. Particularly, recently, in order to further improve the mounting speed, the indexing rotation of the transfer head has become faster, and it becomes more and more difficult to coordinate the operations of the transfer head and the parts feeder. Therefore, if the recovery operation is repeated like the conventional means, it is difficult to achieve the mounting speed while reducing the mounting error.

Therefore, in the present invention, even in the above case,
It is an object of the present invention to provide means for smoothly mounting electronic components.

[0011]

According to the present invention, a plurality of transfer heads are index-rotated along a rotary head to update mounting data of the transfer heads that have reached a new data setting station, and have reached a pickup station. The transfer head picks up electronic components from the parts feeder group, and the transfer head that reaches the mounting station
Electronic components are mounted on the substrate supported by the XY table,
When the mounting data is updated, the blank feed necessity information of the transfer head reaching the new data setting station is set.

[0012]

According to the above configuration, when the mounting data is updated, the idle feed necessity information of the transfer head is set. Therefore, by referring to this blank feed information, the transfer head that does not require blank feed picks up the electronic component from the parts feeder at the pickup station and mounts the electronic component on the substrate at the mounting station. Further, the transfer head that requires idle feeding passes directly through the pickup station and the mounting station. By using the time that the transfer head passes through, the operation of the parts feeder can be coordinated with the operation of the subsequent transfer head. Further, when the operation of the parts feeder is not completed while the transfer head makes one index rotation, the drive system of the transfer head is forcibly decelerated, so that it is not necessary to match the operation of the parts feeder having a delay. . Therefore, since the torque required for the drive system can be reduced as compared with the conventional means, it is possible to sufficiently deal with the use of the drive system having a relatively small torque.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1A is a plan view of an electronic component mounting apparatus according to this means, FIG. 1B is a side view of the same portion, FIG. 2 is the same flowchart, and FIGS.

In FIG. 1, reference numeral 1 denotes a rotary head, and H
Is a transfer head, and as shown in FIG. 1B, each transfer head H is provided with a nozzle N for sucking an electronic component P. When the drive shaft 1a is driven by the drive system 6 such as a motor and a speed reducer, each transfer head H is index-rotated along the rotary head 1 in the direction of arrow M. S1 to S1
Reference numeral 6 denotes each station located when the transfer head H makes an index rotation.

Among them, S1 is a pickup station where the nozzle N picks up an electronic component P from the parts feeder U, and S5 recognizes a positional deviation of the electronic component P picked up by the camera 7 in the XYθ directions, and a control unit which will be described later. A recognition station C that stores the positional deviation information and the like in a mounting data storage unit provided in 20.
P and S9 are X tables 8 (driven by the motor MX),
The mounting stations MP and S10 for mounting the electronic component P adsorbed by the nozzle N on the substrate 10 positioned on the Y table 9 (driven by the motor MY) are mounted on the transfer head H that has finished mounting. It is a new data setting station DP that updates the mounting data in the control unit 20.

Further, 2 is a table moving device provided behind the rotary head 1, 3 and 4 are moving tables provided in the moving device 2, respectively, and a large number of parts feeders U are provided on the moving tables 3 and 4. It is installed side by side. These moving tables 3 and 4 are screwed onto the feed screw 5 and the feed screw 5, and at the same time, the respective tables 3 and 4 are
It is driven by feed nuts 3a and 4a provided at the lower part of the motor and motors 3b and 4b that apply rotational force to the feed nuts 3a and 4a via belts 3c and 4c, respectively.

Then, in accordance with a command from the control unit 20, these moving tables 3 and 4 are moved so that the transfer head H reaching the pickup station QP moves the parts feeder U to be picked up to the station QP. It has become. Further, the distance L from the pickup station QP shown in FIG. 1A indicates a distance that can be advanced in the same manner as in the description of FIG.

Next, the present means will be described with reference to FIGS. According to the present means, in the control unit 20, a sequence number register i as shown in FIG. 3, a mounting data storage unit in which mounting data corresponding to this register i is stored,
A mounting data table for each station from S1 to S16 is provided.

Then, basically, the process proceeds while the sequence number register i is incremented by +1. On the other hand, the mounting data of the transfer head H is updated every time the head H reaches the new data setting station DP (S10).

Specifically, as shown in FIG. 2, the sequence number register i is first initialized (step 1), and then the register i is incremented by 1 (step 2). Then, the mounting data (mounting information in the X, Y, θ directions, etc.) corresponding to the register i is written from the mounting data storage unit to the new data setting station S10 of the mounting data table for each station (steps 3 to 4). The mounting data of the transfer head H up to S10 is updated. Note that this mounting data is updated at this station S10.
Only in. If all the idle feed necessity information (head pass flag) of the transfer head H is no (“0”), the sequence number of the mounting data table for each station is S9 to S1 as shown by the arrow in FIG. S16 ~ S1
It continues in the order of 0.

Next, in steps 5 to 7, it is judged whether or not the idle feeding of the transfer head H to the new data setting station S10 is necessary.

First, in step 5, the number U (S10) of the parts feeder U to be picked up by the transfer head H reaching the new data setting station S10 and the number of the part feeder U to be picked up by the next transfer head H. It is determined whether or not the distance to U (S11) is within the distance L that can be advanced (see also FIG. 6). Next, in step 6, it is determined whether the electronic component P supplied by the parts feeder U (number U (S10)) to be picked up by the transfer head H reaching the station S10 can be picked up by only one feeding operation. (See FIG. 5). Then, in step 7, it is determined whether or not the drive shaft 1a can be decelerated in accordance with the moving time of the parts feeder U.

If all of these judgments are acceptable, it is not necessary to idle the transfer head H to reach the new data setting station S10. Therefore, the head path flag (idle feed necessity information) corresponding to the mounting data of the new data setting station S10 of the mounting table for each station is set to “0 (no)”, the transfer head H is rotated by one index, and The mounting data table for each station is shifted by one station in accordance with this index rotation (steps 8 to 12). In this way, when the data is shifted by one station, the data in S10 is transferred to S11 and S in the mounting data table for each station shown in FIG.
The 16 items move to S1, the S8 items move to S9, and the S9 items move to S10 to receive the next update. When it is unnecessary to feed the transfer head H in this manner,
The transfer head H can be continuously picked up to minimize the loss time.

On the other hand, if any one of the above determinations is negative, the process proceeds to step 9 and the head pass flag (idle feed necessity information) of the new data setting station S10.
Is set to "1 (required)". If this flag is 1, this flag is referred to and the operations such as pickup and mounting of the transfer head H are passed. Then, the register i is decremented by -1. That is, the value of the sequence number register i does not advance and the transfer head H reaching the new data setting station S10 also
The mounting data having the same sequence number i is written from the mounting data storage unit. As a result, the idle feeding process of the transfer head H can be performed for one index rotation. Then, the above register i is the end register ien
The above-described processing is repeated until d is reached (step 1
3).

A more specific description will be given with reference to FIG. In FIG. 3, it is assumed that the above-mentioned advanceable distance L is 2, electronic parts P of all parts feeders U can be picked up by one-time feed, and the deceleration of the drive shaft 1a is all in time. Then, the sequence number register i is 1 to
Up to 18, the difference in the number of parts feeder U | U (S1
0) -U (S11) | <2, and all pass flags are "0". However, the register i = 19
Then, | U (S10) −U (S11) | = 3> L, and it is not possible to postpone. Therefore, state 1
"1" (need empty feed) is set in the pass flag of the station S10 in. Then, steps 10 to 1 in FIG.
When the process 2 is performed, the table is updated to the state 2 shown in FIG.
Becomes That is, the data in which the pass flag is set to "1" in the station S10 is shifted to the station S11. Further, the register i is decremented after being incremented (steps 2 and 10), and remains i = 19, and the transfer head H (head number 1) newly arrived at the station S10.
The same mounting data as that of the transfer head H (head number 10) shifted to the station S11 is also set in 1). Moreover, in the state 2 shown in FIG. 4, the distance between the parts feeders | U (S10) −U (S11) | = 0 <L
Therefore, the head pass flag for the transfer head of head number 11 is “0”. Therefore, the transfer head with the head number 10 is idly fed, and the transfer head with the head number 11 is not idly fed.

[0026]

According to the present invention, a plurality of transfer heads are index-rotated along the rotary head to update the mounting data of the transfer heads that have reached the new data setting station, so that the transfer heads that have reached the pickup station can be updated. ,
When the electronic parts are picked up from the parts feeder group and the transfer head that reaches the mounting station mounts the electronic parts on the substrate supported by the XY table, and when the mounting data is updated, the new data setting station is reached. Since the idle feed necessity information of the transfer head is set, the transfer head can be reliably idled as necessary based on the idle feed necessity information, and the time that the transfer head passes by is used. The operations of the transfer head and the parts feeder can be smoothly coordinated, and the mounting speed of the transfer head can be improved while avoiding mounting errors. In addition, since it is possible to reduce the load on the drive system that drives the index rotation of the transfer head, it is possible to mount electronic components at high speed even if a drive system with a relatively small torque is used.

[Brief description of drawings]

FIG. 1 is a front view and a partial side view of an electronic component mounting apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart according to an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram according to an embodiment of the present invention.

FIG. 4 is an operation explanatory diagram according to an embodiment of the present invention.

FIG. 5 is an operation explanatory diagram of the parts feeder according to the embodiment of the present invention.

FIG. 6 is an operation explanatory diagram of the parts feeder according to the embodiment of the present invention.

[Explanation of symbols]

 H Transfer head DP (S10) New data setting station QP (S1) Pickup station U Parts feeder P Electronic component MP (S9) Mounting station 1 Rotary head 8 X table 9 Y table 10 Substrate

Claims (1)

[Claims] 1. A plurality of transfer heads are index-rotated along a rotary head to update mounting data of transfer heads that have reached a new data setting station, and transfer heads that have reached a pickup station are provided with parts feeder groups. The electronic head is picked up from the electronic component, the electronic head is mounted on the substrate supported by the XY table, and the electronic head is transferred to the mounting station. When the electronic data is updated, the electronic head is transferred to the new data setting station. A method for mounting electronic components, characterized in that the blank feed requirement information is set.