JP2005086034A - Component mounter, method and program for automatically switching carrying speed of printed circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a component mounter capable of regulating the carrying speed of a printed board automatically depending on an electronic component mounted on the printed circuit board. <P>SOLUTION: The component mounter (304) for mounting an electronic component on a printed circuit board carried on a specified carrying passage based on a set carrying speed by stopping the printed circuit board temporarily at a component mounting position in the way of the carrying passage and carrying the printed circuit board again at a set carrying speed after mounting the electric component at the component mounting position comprises a means (302) for setting the degree of positional shift of the electronic component mounted on the printed circuit board at carriage, and a means (303) for switching the carrying speed automatically such that the electronic component mounted on the printed circuit board is not shifted based on the positional shift of the electronic component set by the setting means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a component mounting apparatus that positions a printed circuit board at a predetermined position and mounts electronic components on the printed circuit board, and more particularly to a speed adjustment technique for a transport mechanism that transports the printed circuit board.

  Conventionally, a component mounting device is known as a device for mounting electronic components. In this component mounting apparatus, a printed circuit board, on which electronic components are to be mounted, is placed on both sides by a conveyor belt (for example, a conveyor belt), and is carried to a positioning position by the movement of the conveyor belt. When the printed circuit board reaches the positioning position, a backup pin for positioning the printed circuit board rises from the back side of the printed circuit board to support the back surface of the printed circuit board, and the backup pin further rises to raise the printed circuit board. The substrate is fixed away from the conveyor belt. Various electronic components are mounted on the printed circuit board thus positioned by a work robot under predetermined control. When the mounting of the predetermined electronic component on the printed circuit board is completed, the backup pins for positioning the printed circuit board are lowered, and the edges on both sides of the printed circuit board are placed on the transport belt and the backup is performed. The pin further descends and leaves the printed circuit board. The printed circuit board placed again on the transport belt is transported in the transport direction by the movement of the transport belt. In the above-described printed board conveyance process, a sensor is provided at a necessary place, and the sensor detects whether the printed board has reached a predetermined position. Further, the transition from the predetermined operation to the next operation in the printed circuit board transport process is performed based on a check timer in which the transition time to each operation is set in advance.

  In general, the movement of the conveyor belt can be switched between several stages such as high-speed movement, low-speed movement, and reverse rotation movement. In order to increase the efficiency of mounting electronic components on a printed board, the conveyor belt is generally set at a high speed. On the other hand, the other low speed operation and reverse rotation operation are provided in order to quickly and accurately position the printed circuit board that has been carried in from the upstream of the line at the component mounting position. For example, in the case of high-speed operation only, if the printed circuit board approaches the component mounting position at high speed, the inertial force of the conveyor belt that tries to move in the conveying direction is large even if the conveying force is cut near the component mounting position. The board greatly exceeds the component mounting position. For this reason, the low-speed operation is used as an operation for detecting that the printed circuit board has approached the component mounting position by a sensor or the like, and switching from the high-speed operation based on the position detection. Can rest at a position slightly above the component mounting position. Then, by switching the operation of the transport belt from the low speed operation to the reverse rotation operation, the printed circuit board is accurately positioned immediately below the component mounting position.

Naturally, the check timer is set so that a fixed time is set in accordance with the operation of the transport belt, and the printed circuit board can be transported at high speed and smoothly.
A technique for controlling the transport mechanism is disclosed in Japanese Patent No. 2767307.
Japanese Patent No. 2767307

  On the other hand, the electronic component is mounted on the printed circuit board in the component mounting process described above by placing the electronic component corresponding to a predetermined position on the printed circuit board by the work robot. Therefore, the electronic component on the printed circuit board after the component mounting process is not easily fixed at that position, and therefore, when the printed circuit board is moved, the electronic component is liable to be laterally displaced.

Nevertheless, in the conventional component mounting apparatus, the discharge processing of the printed circuit board after mounting the electronic components is performed only by the high-speed operation of the conveyor belt.
For this reason, among electronic components mounted on a printed circuit board, those that are relatively heavy and have a relatively small installation area with respect to the printed circuit board are shifted laterally during the printed circuit board discharge process, and the printed electronic component is mounted. Since the substrate becomes a defective substrate, the conventional control of the conveyor belt has been raised as a problem as one factor that increases the number of defective substrates and causes a reduction in production efficiency.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a component mounting apparatus, a printed circuit board transport speed automatic switching method, and a program thereof that can automatically adjust the transport speed of a printed circuit board according to electronic components mounted on the printed circuit board.

In order to solve the above problems, the present invention is configured as follows.
One aspect of the component mounting apparatus of the present invention is that the printed circuit board is mounted at a component mounting position configured in the middle of the transport path with respect to the printed circuit board transported on a predetermined transport path based on the set transport speed. On the premise that the printed circuit board is transported again at a set transport speed when the mounting process of the electronic component at the component mounting position is completed. The electronic component mounted on the printed circuit board is set on the printed circuit board based on the setting means for setting the positional displacement degree when the printed circuit board is conveyed and the positional displacement degree of the electronic component set by the setting means. Conveying speed switching means for automatically switching the setting of the conveying speed so that the electronic component is not misaligned.

  In this configuration, a check timer for monitoring a waiting time until the predetermined transport process is started or a time until the predetermined transport process is completed, among the transport processes of the printed circuit boards that are transported along the transport path, Based on the setting of the conveyance speed switched by the conveyance speed switching means, a time for calculating the waiting time until the predetermined conveyance process is started or the time until the predetermined conveyance process is completed by the check timer It is desirable to further include a calculation unit.

  In each of the above aspects, the setting means sets the degree of positional deviation of the electronic component mounted on the printed board when the printed board is conveyed in units of the electronic component, and the conveyance speed switching means When at least one of the positional deviation degrees set by the setting means is equal to or higher than a predetermined level, the setting of the conveyance speed is automatically switched so that all electronic components mounted on the printed circuit board are not displaced. Is desirable.

  In each of the above aspects, the transport speed is basically set to a high speed, and the transport speed switching means is only when at least one of the positional deviation degrees set by the setting means is equal to or higher than a predetermined level. You may comprise so that the setting of the said conveyance speed may be switched to low speed so that all the electronic components mounted in the said printed circuit board may not shift position.

In each of the above aspects, the degree of positional deviation set by the setting means is set to a larger degree of positional deviation as the ground contact area of the electronic component with respect to the printed circuit board is smaller or the weight of the electronic component is heavier. It may be done.
One aspect of the printed circuit board conveyance speed automatic switching method of the present invention is a component mounting position configured in the middle of the conveyance path with respect to the printed circuit board conveyed on the predetermined conveyance path based on the set conveyance speed. The printed circuit board is temporarily stopped to perform electronic component mounting processing, and when the electronic component mounting processing at the component mounting position is completed, the printed circuit board is transported again at a set transport speed. On the premise that the electronic component is mounted on the printed circuit board, the degree of positional deviation of the printed circuit board when the printed circuit board is conveyed is set, and the electronic component based on the set degree of positional deviation is set. The setting of the conveyance speed is automatically switched so that the electronic components mounted on the printed circuit board are not misaligned.

  In the above aspect, a check timer for monitoring a waiting time until the predetermined transport process is started or a time until the predetermined transport process is completed among the transport processes of the printed circuit board transported along the transport path. Further, the waiting time until the predetermined transport process is started or the time until the predetermined transport process is completed is calculated by the check timer based on the switched transport speed setting. It is desirable to make it.

  According to one aspect of the program of the present invention, the printed circuit board is temporarily moved at a component mounting position configured in the middle of the conveyance path with respect to the printed board conveyed on a predetermined conveyance path based on the set conveyance speed. The electronic component is mounted and the electronic component mounting process is performed. When the electronic component mounting process at the component mounting position is completed, the printed circuit board is transported again at the set transport speed. Based on the premise, the electronic component mounted on the printed circuit board is mounted on the printed circuit board based on the function of setting the positional displacement degree when transporting the printed circuit board and the set positional displacement degree of the electronic component. The computer realizes a function of automatically switching the setting of the conveyance speed so that the electronic component is not displaced.

  In the above aspect, a check timer for monitoring a waiting time until the predetermined transport process is started or a time until the predetermined transport process is completed among the transport processes of the printed circuit board transported along the transport path. A function for calculating a waiting time until the predetermined transport process is started or a time until the predetermined transport process is completed by the check timer based on the setting of the switched transport speed; Are preferably further realized by a computer.

  Thus, in the present invention, the transport speed of the printed circuit board when transporting the printed circuit board on which the electronic component is mounted can be switched according to, for example, the degree of positional deviation set for each electronic component. For this reason, for example, when a printed circuit board carrying even one electronic component having a degree of positional deviation equal to or higher than a predetermined level is conveyed, the conveyance speed of the printed board is switched to a speed (for example, low speed) that does not cause the positional deviation. Can do.

  Even when the check timer for monitoring the transport process of the printed circuit board is further configured, the time set in the check timer can be adjusted to the time suitable for the transport speed after the switching.

  As described above, according to the present invention, the conveyance speed of the printed board can be automatically adjusted according to the degree of positional deviation of the electronic component mounted on the printed board. In particular, if at least one electronic component that causes displacement when the printed circuit board is transported at a high speed is mounted on the printed circuit board, the transport speed of the printed circuit board is set to a low speed. The printed circuit board is conveyed at a speed. For this reason, it is possible to eliminate or reduce the positional deviation of the electronic component, and it is possible to prevent the occurrence of defective substrates due to the positional deviation of the electronic component.

  In addition, when the check timer is configured, the time set in the check timer is automatically calculated, so there is no need to manually change the check timer setting each time according to the PCB transport speed. Disappear. This reduces the burden on the operator and improves the work efficiency.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is an example of a component mounting apparatus which is the best mode for carrying out the present invention.
FIG. 4A is a perspective view of the component mounting apparatus in which the internal mechanism is shown by a solid line, and FIG. 2B shows the internal mechanism of FIG. .

  A pair of parallel board guide rails 104 is provided at the center on the base 102 formed at the lower part of the component mounting apparatus 100 shown in FIG. Direction, diagonally extending from diagonally lower left to diagonally upper right). Below these substrate guide rails 104, a loop-shaped conveyance belt (conveyor belt) that is hidden and not visible in the figure is in both the positive and negative directions of the X axis (from the carry-in side to the discharge side or from the discharge side to the carry-in side). It is arranged so that it can run. Further below this, a backup pin for supporting and fixing the printed circuit board 106 from the back in order to fix the printed circuit board 106 to the component mounting position, and this backup pin can be freely mounted and driven by a motor or the like. A lifting table that moves up and down is provided. The printed circuit board 106 placed on the conveyance belt can be conveyed in both the positive and negative directions of the X axis while being guided by the substrate guide rail 104 by the rotation of the conveyance belt. When the printed circuit board 106 is transported below the component mounting position by the rotation of the transport belt, the printed circuit board 106 is pushed up from the transport belt to the component mounting position together with the lifting operation of the lifting table, and an electronic component mounting process described later is performed. Therefore, the printed circuit board 106 is fixed at the component mounting position. When the electronic component mounting process is completed, the printed circuit board 106 is placed again on the transport belt with the lowering operation of the lifting table, and is transported in the discharge direction of the printed circuit board by the rotation of the transport belt.

As described above, the component mounting apparatus 100 of FIG. 1 includes a transport mechanism for carrying in, fixing the position of, and discharging the printed circuit board 106.
In the component mounting apparatus 100 of FIG. 1, two printed circuit boards 106 are always carried in, and the electronic component mounting process is performed on each printed circuit board 106.

Although not shown in the figure, in addition to the above-described transport mechanism, the base 102 is provided with a computer that controls the transport mechanism, each drive unit described later, or various arithmetic processes. It has been.
This computer is electrically connected to a display device (not shown), a touch panel type input display device, or a drive unit of a component mounting device, etc., which is configured above the casing indicated by the broken line in FIG. Control each drive unit according to the program, perform calculations based on information input from the input display device, control each drive unit according to the calculation results, or mount electronic components Etc. are displayed on the display device.

  Parts supply bases 108 are respectively formed on the front and rear sides of the base 102 (in FIG. 5A, the rear part supply base 108 in the upper left direction of the figure is hidden and cannot be seen. In the drawing (b), the rear part supply base 108 is not shown). A large number of tape cassette type component supply devices 110 (generally simply referred to as a tape feeder, a cassette type, or a tape component supply device, etc.), 50 to 70, are arranged on the component supply base 108. The electronic components are sent out from the tape cassette type component supply device 110 to the component supply position.

A photographing camera 111 is configured on the top surface of the base 102 so as to face upward. In the component mounting apparatus 100, the photographing cameras 111 are configured as a pair on the left and right, and one at a position that cannot be seen in the shade in the figure facing each of the photographing cameras 111.
Above the base 102, a pair of left and right fixed rails (Y-axis rails) 112 extending in parallel to a direction (front-rear direction) perpendicular to the substrate transport direction is disposed. A moving rail (X-axis rail) 114 is slidably engaged along the Y-axis rail 112 before and after the Y-axis rail 112, and the work head 116 is slidable along the X-axis rail 114. Suspended by. That is, a total of four work heads 116 are arranged in the component mounting apparatus 100 shown here.

The X-axis rail 114 shown here is engaged with a ball screw 117 inside the Y-axis rail 112 shown at a position where a part of the Y-axis rail 112 shown in FIG. ing.
Then, the movement of the X-axis rail by the positioning mechanism using the ball screw is controlled by the rotation of a servo motor (not shown) under the control of the computer housed in the base 102, and by the rotational drive of the ball screw 117 receiving the rotational force. Then, the ball screw 117 is moved along the Y-axis rail 112 via the nut.

Similarly to the positioning mechanism for the X-axis rail 114, the positioning mechanism for the ball screw is also used for positioning the work head 116 on the X-axis rail 114.
Therefore, the work head 116 moves on the ball screw along the X-axis rail 114 via a nut by a rotational drive based on the computer control of a ball screw (not shown) accommodated in the X-axis rail 114.

In each working head 116 shown in the figure, in the example shown in the figure, two mounting heads 118 are disposed so as to be movable up and down (Z direction) and rotatable in a 360 degree direction. A total of eight mounting heads 118 are arranged in the component mounting apparatus 100 of this example.
Each mounting head 118 has a horizontal movement in the Y-axis direction of the X-axis rail 114, a horizontal movement in the X-axis direction of the work head 116, a vertical movement in the Z-axis direction by the mounting head 118 itself, and the Z-axis as a center. By this rotation, it is possible to freely move the position of the printed circuit board 106 fixed at the component supply position and the component mounting position with respect to the front, rear, left, right, up and down and change the direction in the 360 degree direction in the horizontal plane.

An adsorbing nozzle that directly adsorbs electronic components is selected at the tip of the mounting head 118, and an appropriate adsorbing nozzle is selectively selected from an adsorbing nozzle exchanging unit (not shown in the figure) equipped with a plurality of types of adsorbing nozzles. Installed.
The suction nozzle and the mounting head 118 have a hollow structure, and positive or negative air pressure based on control of an electromagnetic valve (not shown) is applied to the suction surface of the suction nozzle through the hollow portion of the mounting head 118.

FIG. 2 is a diagram schematically showing a transport mechanism (not shown) in the component mounting apparatus 100 of FIG.
1 is a side view of the above-described transport mechanism in which the transport direction (positive direction of the X axis) of the printed circuit board 106 in FIG. 1 is from right to left in FIG. 1, and the transport mechanism 200 of this example includes three transport units ( A load unit 202, a stage unit 204, and an unload unit 206) are combined from the right side of FIG.

  The load unit 202 is configured on the carry-in side (upstream side of the line) of the component mounting apparatus 100 in FIG. 1, and the load belt 210 is rotated in the conveying direction by driving the load belt drive motor 208 by computer control. The printed circuit board placed on 210 is drawn into the component mounting apparatus.

  The stage unit 204 is configured in the component mounting apparatus, and the stage belt drive motor 212 is driven by computer control in the same manner as described above, so that the stage belt 214 rotates forward or backward and is conveyed from the load belt 210. The printed circuit board that has been placed is positioned for mounting the electronic component, and is conveyed in the discharge direction after the electronic component mounting process.

  The unload unit 206 is configured on the discharge side (downstream side of the line) of the component mounting apparatus 100, and the unload belt 218 is rotated by driving the unload belt drive motor 216 by computer control in the same manner as described above. The printed circuit board conveyed from 214 is discharged out of the component mounting apparatus.

In addition, various sensors for detecting the passage of the printed circuit board are provided at necessary places on the printed circuit board conveyance path formed by connecting the three conveyance belts 202, 204, and 206 shown in FIG.
In the example of the figure, a load sensor 220 is provided in the vicinity of the boundary with the stage belt 214 within the configuration range of the load belt 210, and is located at the center of the figure within the configuration range of the unload belt 218 and at the left end of the figure. Unload sensors (first unload sensor 222 and second unload sensor 224) are provided one by one. Although not shown in the figure, the various sensors are electrically connected to a computer that controls the various drive motors.

  Further, a stopper for positioning the printed circuit board at a predetermined position is provided at a position indicated by an arrow 226 in the figure near the load belt 210 within the configuration range of the stage belt 214. Although not shown in the drawing, the stopper protrudes above the conveyor belt or is stored below the conveyor belt based on the control of the stopper driving unit by computer control.

FIG. 3 is a control block diagram of the transport mechanism that is driven based on computer control.
Each configuration of the control block diagram 300 includes a setting unit 302, a determination unit 303, a load processing control unit 304, a load belt drive unit 306, a load sensor 220, a stage belt drive unit 308, an unload belt drive unit 310, a first It comprises an unload sensor 222, a second unload sensor 224, a stopper drive unit 312, a stopper sensor 314, a lift table drive unit 316, and a lift table sensor 318.

The load belt drive unit 306 includes the load belt drive motor 208 and the load belt 210 shown in FIG.
The stage belt drive unit 308 includes the stage belt drive motor 212 and the stage belt 214 shown in FIG.

The unload belt drive unit 310 includes the unload belt drive motor 216 and the unload belt 218 shown in FIG.
Here, the stopper driving unit 312 refers to the stopper and the stopper driving unit described in FIG.

The lifting table driving unit 316 is a lifting table supported by backup pins from the back surface of the printed circuit board to move the printed circuit board to the component mounting position and its driving unit.
The stopper sensor 314 detects the operating state of the stopper.

The lift table sensor 318 detects the operating state of the lift table.
The load sensor 220 detects whether the printed circuit board has passed the position of the load sensor 220 in FIG.
The first unload sensor 222 detects whether the printed circuit board has passed the position of the first unload sensor 222 in FIG.

The second unload sensor 224 detects whether the printed circuit board has passed the position of the second unload sensor 224 in FIG.
For example, the setting unit 302 stores information stored in an input display device (not shown) configured in the component mounting apparatus 100 of FIG. 1 or a portable storage medium such as a floppy (registered trademark) disk, CD-R, or DVD. A data reading device (not shown) that transfers data to the determination unit 303 via a bus or the like, a communication device that receives information transmitted from another communication device via a communication network such as a LAN, and the like.

The information transmitted from the setting unit 302 to the determining unit 303 includes component information related to electronic components to be mounted on a printed board, a component mounting processing program, and the like.
Based on the component information and component mounting processing program transmitted from the setting unit 302, the determination unit 303 determines the setting of the substrate transfer speed and the setting of the check timer that is executed at various points during substrate transfer, and loads the determined information. Send to processing control unit.

The load processing control unit 304 controls the drive units by executing a substrate transfer program based on the information determined by the determination unit 303 and the detection information transmitted from the various sensors.
FIG. 4 is an example of component information set by the setting unit 302 of FIG.

This figure shows a part information setting screen 400 in the input display device listed as one of the setting sections 302.
In the setting screen 400 of this example, the model number 402 of the electronic component is displayed in the upper left, and a selection tab 404 for selecting the corresponding item is displayed in the lower column so that information regarding the electronic component can be selected by item. Are lined up.

In this example, the item “place” 406 is selected, and the place information is displayed all over.
In the place information of this example, “high speed” is set for the horizontal movement speed “movement speed XY” 408 of the mounting head, and “medium speed” is set for the rotation speed “movement speed θ” 410 of the mounting head. Has been. Further, “medium / high speed” is set for the elevation speed “place-down speed” 412 and “place-up speed” 414 of the mounted head, and “50 ms” and “place height” are set for the “place time” 416. “0 mm” is set for the “offset” 418, and “0 ms” is set for the “blow end time offset” 420 that sets a difference from a predetermined time. The check box 422 for checking the presence / absence of polarity of the electronic component is set to no polarity, and “0” is set for “X”, “Y”, and “θ” of the “place offset” 424. Yes.

  Further, in the setting screen 400 of this example, when it is determined that the displacement of the electronic component is caused by the movement of the printed circuit board on which the electronic component is mounted, the conveyance speed of the printed circuit board on which the electronic component is mounted is reduced. A “transport throw after mounting this part” check box 426 is provided to instruct the load processing control unit to perform the check. When the check box 426 is not marked, the transport speed is set to a high speed. The check box 426 is marked with black for the electronic component shown in this example.

  In the above example, the positional deviation degree of the electronic component is indicated by two levels of ON (flag 1) or OFF (flag 0) with respect to the check box. For example, the electronic component type, shape, dimension, Depending on the weight, size, contact area with the printed circuit board, etc., not only two levels but also a plurality of levels can be achieved. In particular, the positional deviation of an electronic component having a heavy weight and an electronic component having a small contact area (for example, QFP) is large, and the degree of positional deviation is set to be large.

Then, based on the component information input from the setting screen as in the above example and the component mounting processing program for the component mounting processing target printed circuit board, the determination unit 303 in FIG. Determine the check timer settings.
5 and 6 are processing flows in the determination unit 303 and the load processing control unit 304 in FIG.

First, an electronic component with the “Transport Throw after mounting this component” check box shown in the setting screen example 400 is registered in a component mounting processing program to be executed on a printed circuit board subject to component mounting processing. It is determined whether or not (S500).
In addition, unlike the setting screen example 400, when the degree of positional deviation of the electronic component is set at a plurality of levels, a reference value is provided, and determination can be made based on whether the degree of positional deviation is equal to or greater than the reference value. .

  If it is determined that the electronic component is not registered by this determination, the setting value that determines the rotation speed of each conveyor belt of the load belt driving unit 306 and the stage belt driving unit 308 is set to “high speed” set by default. The set value is maintained (for example, 370 ms) (S502).

The setting of the check timer is also maintained in the default state (S504).
If it is determined by the determination that the electronic component is registered, a setting value for determining the rotation speed of each conveyor belt of the load belt driving unit 306 and the stage belt driving unit 308 is set to a “low speed” setting value ( For example, it is changed to 90 ms) (S506).

Then, the setting of the check timer is calculated in accordance with the “low speed”, and the setting of the check timer is changed from the default setting value to the calculated value (S508).
Note that the check timer in this example is a stopper after the printed circuit board has passed the load sensor 220 in FIG. 2, with the time limit for the loaded printed circuit board passing through the position of the load sensor 220 as the first check timer. The second check timer is the waiting time until the is operated, and the third check timer is the waiting time until the stage belt is reversely rotated after the stopper is operated. In this case, the set values of the first to third check timers can be calculated based on the rotation speed of each conveyor belt and a predetermined margin time. In addition, a table in which the conveyance speed is associated with the set value of the check timer is stored in advance, and the set value of the check timer corresponding to the selected conveyance speed is set based on the table. Also good.

Next, in order to carry the printed circuit board from the upstream side of the line, the load belt driving unit 306 and the stage belt driving unit 308 are rotated at a high speed or a low speed based on the set value (S510).
After the execution of step S510, when the time limit set as the first check timer has elapsed, it is determined whether or not the loaded printed circuit board has been detected by the load sensor 220 (S512).

  If it is determined by this determination that the printed circuit board has been detected by the load sensor within the time limit, it is determined that the printed circuit board has passed the position of the load sensor 220 in FIG. 2 within the time limit (S514). If the printed circuit board is not detected by the load sensor within the time limit, it is predicted that a problem has occurred during the transportation of the printed circuit board, and the process is stopped. For example, the printed circuit board is kept in a normal state and continues. Transfer process to process.

Then, when the standby time set as the second check timer has elapsed, the stopper driving unit 312 is activated, and the stopper sensor 314 detects whether or not the stopper is raised (S516).
Subsequently, when the stage belt drive unit 308 is rotating at a high speed, it is switched to a low speed rotation (S518). The switching to the low speed rotation is performed in order to move the printed circuit board to a predetermined position related to mounting of the electronic component in a short time.

  Further, when the standby time set as the third check timer elapses, the stage belt driving unit 308 that has been normally rotated is reversely rotated, and the printed circuit board is moved backward in the line upstream direction (S520). By this process, the rear side of the printed board is stopped by the stopper, and the printed board is positioned at the position.

Then, the lifting / lowering table driving unit 316 is driven to raise the lifting / lowering table from below the printed circuit board and fix the printed circuit board at the component mounting position (S522). The operating state of the lift table is detected by a lift table sensor 318.
Here, although not shown in the block diagram of FIG. 3, the component mounting control unit that controls mounting of the electronic component on the printed circuit board detects this state and executes the electronic component mounting process on the printed circuit board. .

This electronic component mounting process is a process conventionally performed, and the following operation is performed as an example.
First, an electronic component to be mounted on the printed board is sent from a component supply device to a component supply position. Subsequently, the suction nozzle is selectively mounted at the tip of the mounting head by the horizontal movement of the working head and the movement of the mounting head based on the up-and-down movement and rotation of the mounting head itself configured in the working head. Then, the mounting head is moved above the component supply position. Subsequently, the suction nozzle mounted at the tip of the mounting head is moved closer to the top surface of the electronic component sent to the component supply position by the lifting and lowering operation of the mounting head, and negative air pressure is applied to the suction surface by controlling the electromagnetic valve. To adsorb the electronic component. Subsequently, the mounting head is fixed at the component mounting position while the electronic component is adsorbed by the horizontal movement of the working head and the movement of the mounting head based on the up-and-down movement and rotation of the mounting head itself. The mounting position on the printed circuit board is moved. During this movement, the mounting position of the electronic component is picked up by photographing the suction state of the electronic component with a photographing camera configured in the middle of the movement path of the mounting head and analyzing the photographed image. The amount of positional deviation is calculated. Then, based on the horizontal movement of the working head and the rotation of the mounting head itself configured on the working head, the positional deviation of the electronic component on the printed board is corrected, and the mounting position on the printed board is accurately corrected. The above electronic components are mounted on. This process is repeatedly performed on the electronic components scheduled to be mounted on the printed board. When the mounting of all the electronic components scheduled to be mounted on the printed board is completed, the electronic component mounting process is finished.

Note that the operation of each unit is performed based on a set value determined for each electronic component, as shown in the setting screen of FIG.
When the electronic component mounting process is completed as described above, the operation shifts to the load process control unit 304, and the load process control unit 304 drives the lift table drive unit 316 to lower the printed board together with the lift table (S524). .

  When the lift table sensor 318 detects that the lift table has been lowered after the printed circuit board is placed on the stage belt, the stage belt drive unit 308 and the unload belt drive unit 310 are driven to drive the stage shown in FIG. The belt and the unload belt are rotated in the forward direction (S526). The stage belt and the unload belt are also driven at a high speed or a low speed according to the rotation speed when the printed board is carried.

As a result, the printed circuit board is transported to the downstream side of the line without the electronic components mounted on the mounting surface being displaced when transported by the transport belt.
When the printed circuit board is detected by the first unload sensor 222 and it is detected that the printed circuit board has passed the position of the first unload sensor 222 in FIG. 2, the next print for mounting the electronic component is performed. Although not shown in FIG. 3, the apparatus on the upstream side of the line is instructed to flow the substrate (S528).

  Then, when the printed circuit board is further conveyed to the downstream side of the line and detected by the second unload sensor 224, it is detected that the printed circuit board has passed the position of the second unload sensor in FIG. Although not shown in FIG. 3, the apparatus downstream of the line is instructed to allow the printed circuit board to flow (S530).

The above processing is performed by the CPU (central processing unit) by storing the processing program in a storage unit configured in the computer of the component mounting apparatus in advance or by storing the processing program in the storage unit via an input device. A processing program can be executed.
In addition, the above-described steps S500 to S508 are executed in a management terminal that performs line management, and the setting program set in the management terminal is installed in the component mounting apparatus, so that the processes after step S510 are performed. You can also make it run.

The above processing can also be distributed in the form of a program.
In that case, the program is recorded and distributed on a recording medium such as a floppy (registered trademark) disk, CD-ROM, DVD, or a part of the program via a transmission medium used in a public network, Or it can be made to distribute all.

  A user who has acquired the program distributed in the above form is configured in a data processing apparatus such as a computer, for example, a reading unit that reads information recorded on the recording medium or a communication unit that performs data communication with an external device. By reading the program into a memory such as a RAM or a ROM that is connected via a bus, and causing the CPU (central processing unit) connected via the bus to execute the program. It becomes possible to implement | achieve the said process in a user's component mounting apparatus.

  In the above example, the presence or absence of misalignment of the electronic component is specified based on the marking of the “conveyance throw after mounting this component” check box provided on the setting screen of the input display device. The presence / absence of the positional deviation may be automatically determined based on information such as the type, shape, size, contact area, or weight of the electronic component included in the information.

In the above example, the rotation operation of each conveyor belt is three operations of “high-speed rotation”, “low-speed rotation”, and “reverse rotation”, but the rotation operations may be arbitrarily set.
Further, as shown in the above example, it is desirable to use a check timer for transporting the printed circuit board, but it is also possible to employ a configuration in which no check timer is used.

In the above example, three types of conveyor belts are used. However, the type is not limited to these three types and can be selected as appropriate.
As described above, in the embodiment of the present invention, the conveyance speed of the printed circuit board when the printed circuit board on which the electronic component is mounted can be switched according to the degree of positional deviation set for each electronic component. For this reason, for example, when transporting a printed board on which even one electronic component having a degree of positional deviation equal to or higher than a predetermined level is transported, the transport speed of the printed board is switched to a speed that does not cause the positional deviation (for example, low speed). Can do. For this reason, it is possible to eliminate or reduce the positional deviation of the electronic component, and it is possible to prevent the occurrence of defective substrates due to the positional deviation of the electronic component.

  In addition, regarding the check timer for monitoring the transport process of the printed circuit board, the time set in the check timer is automatically calculated according to the transport speed of the printed circuit board. There is no need to manually change the check timer setting each time. This reduces the burden on the operator and improves the work efficiency.

It is an example of the component mounting apparatus which is the best form for implementing this invention. It is the figure which showed typically the conveyance mechanism of the component mounting apparatus 100 of FIG. It is a control block diagram of the conveyance mechanism driven based on computer control. It is an example of the component information set from the setting part 302 of FIG. It is a processing flow in the determination part 303 and the load process control part 304 of FIG. It is a continuation of the processing flow of FIG.

Explanation of symbols

302 Setting unit 303 Determination unit 304 Load processing control unit 306 Load belt driving unit 308 Stage belt driving unit 310 Unload belt driving unit 312 Stopper driving unit 314 Stopper sensor 316 Lifting table driving unit 318 Lifting table sensor

Claims (9)

With respect to a printed circuit board that has been transported on a predetermined transport path based on a set transport speed, the printed circuit board is temporarily stopped at a component mounting position that is configured in the middle of the transport path to perform electronic component mounting processing. And a component mounting device that transports the printed circuit board again at a set transport speed after finishing the mounting process of the electronic component at the component mounting position,
Setting means for setting the degree of positional deviation of the electronic component mounted on the printed circuit board when transporting the printed circuit board;
Based on the degree of positional deviation of the electronic component set by the setting means, a conveyance speed switching unit that automatically switches the setting of the conveyance speed so that the electronic component mounted on the printed circuit board does not deviate.
A component mounting apparatus characterized by comprising: A check timer for monitoring a waiting time until a predetermined conveyance process is started or a time until a predetermined conveyance process is completed, among the conveyance processes of the printed circuit board that is conveyed along the conveyance path,
Based on the setting of the transport speed switched by the transport speed switching means, a time for calculating the waiting time until the predetermined transport process is started or the time until the predetermined transport process is completed by the check timer A calculation unit;
The component mounting apparatus according to claim 1, further comprising: The setting means sets the degree of positional deviation of the electronic component mounted on the printed circuit board at the time of transporting the printed circuit board in units of the electronic component,
The transport speed switching unit is configured to prevent the positional deviation of all electronic components mounted on the printed circuit board when at least one of the positional deviation levels set by the setting unit is equal to or higher than a predetermined level. Automatically switch the transfer speed setting,
The component mounting apparatus according to claim 1 or 2, characterized in that: The conveyance speed is basically set to high speed,
The transport speed switching means prevents all electronic components mounted on the printed circuit board from being misaligned only when at least one of the degree of misalignment set by the setting means is equal to or higher than a predetermined level. Switching the setting of the conveyance speed to a low speed,
The component mounting apparatus according to claim 1, wherein the component mounting apparatus is a component mounting apparatus. The degree of positional deviation set by the setting means is set to a larger degree of positional deviation as the ground contact area of the electronic component with respect to the printed circuit board is smaller or the weight of the electronic component is heavier.
The component mounting device according to claim 1, wherein the component mounting device is a component mounting device. With respect to a printed circuit board that has been transported on a predetermined transport path based on a set transport speed, the printed circuit board is temporarily stopped at a component mounting position that is configured in the middle of the transport path to perform electronic component mounting processing. When the electronic component mounting process at the component mounting position is finished, the printed circuit board transport speed automatic switching method of the component mounting apparatus, which transports the printed circuit board again at a set transport speed,
Set the degree of positional deviation of the electronic component mounted on the printed circuit board when transporting the printed circuit board,
Based on the set degree of displacement of the electronic component, the setting of the conveyance speed is automatically switched so that the electronic component mounted on the printed circuit board is not displaced.
A printed circuit board conveyance speed automatic switching method. A check timer is further configured to monitor a waiting time until the predetermined transport process is started or a time until the predetermined transport process is completed, among the transport processes of the printed circuit boards that are transported along the transport path,
Based on the switched transport speed setting, the check timer calculates a waiting time until the predetermined transport process is started or a predetermined transport process is completed.
The printed circuit board conveyance speed automatic switching method according to claim 6. With respect to a printed circuit board that has been transported on a predetermined transport path based on a set transport speed, the printed circuit board is temporarily stopped at a component mounting position that is configured in the middle of the transport path to perform electronic component mounting processing. When the mounting process of the electronic component at the component mounting position is finished, the program is executed by the computer to transport the printed circuit board again at a set transport speed,
A function of setting the degree of positional deviation of the electronic component mounted on the printed circuit board when the printed circuit board is conveyed;
A function of automatically switching the setting of the conveyance speed so that the electronic component mounted on the printed circuit board is not displaced based on the set degree of displacement of the electronic component;
Is realized by a computer. A check timer is further configured to monitor a waiting time until the predetermined transport process is started or a time until the predetermined transport process is completed, among the transport processes of the printed circuit boards that are transported along the transport path,
A function of calculating a waiting time until the predetermined transport process is started or a time until a predetermined transport process is completed based on the switched transport speed setting;
The program according to claim 8, further realized by a computer.

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