JP2002185195A - Surface-mounting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately judge whether parts are sucked by a suction nozzle or not in a surface-mounting machine. SOLUTION: For each nozzle 21, pressure in the nozzle 21 when the suction port of the nozzle 21 is opened is stored in an internal storage section 303 as the minimum negative pressure value, and at the same time the pressure in the nozzle 21 when the suction port of the nozzle 21 is closed is stored in the internal storage section 303 as the maximum negative pressure value. Then, based on the maximum and minimum negative pressure values and the type of parts, a main operation section 301 sets a specified negative pressure value in part suction, and the pressure in the nozzle 21 for sucking parts is compared with the specified negative pressure value, thus judging whether the parts have been sucked or not by the nozzle 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a suction nozzle attached to a mounting head for sucking a component of a component supply unit, and moving the mounting head to a component mounting unit while maintaining the suction state. The present invention relates to a surface mounter that releases a component suction by a suction nozzle and mounts the component on a printed circuit board of the component mounting unit, and has a function of determining whether a component is suctioned by the suction nozzle.

[0002]

2. Description of the Related Art Conventionally, a surface mount unit is provided with a mounting head which is movable up and down and rotatable on a head unit movable between a component supply unit and a printed circuit board positioned at a predetermined work position (component mounting unit). Machines are generally known. This surface mounter sucks an electronic component by a suction nozzle (hereinafter, abbreviated as a nozzle) attached to a lower end of the head, confirms the suction of the component, moves the mounting head to a printed circuit board, and moves the nozzle to the nozzle. Then, the components are attached and the components are mounted.

In this surface mounter, a prescribed value for the pressure (negative pressure) in the nozzle is set in advance, and a pressure sensor for detecting the pressure in the nozzle is provided in order to confirm the suction of components by the nozzle. The pressure value actually measured when the component is actually sucked by the nozzle is compared with the specified value, and the suction determination is performed based on the comparison result. Also, at the time of component mounting, it is determined whether or not the component suction by the nozzle has been reliably released at the time of component mounting by using the specified value. As described above, the specified value plays an important role for confirming component suction and component mounting.

[0004]

In this type of surface mounter, it is required to selectively use a plurality of types of nozzles according to the type of component. For this reason,
The nozzles are replaceable, and a plurality of types of nozzles are prepared in advance at a nozzle replacement station so that the nozzles can be replaced during the mounting operation.
Alternatively, a plurality of mounting heads are arranged in a head unit, and different types of nozzles are attached to these heads, or a plurality of nozzles are selectively attached to the head so as to be usable.

[0005] The openings of these plural types of nozzles have various shapes and opening areas depending on the application.
For this reason, the pressure level in the nozzle at the time of component suction or release of suction is naturally different from each other.

However, in the conventional surface mounter, only a single specified value has been set as the index for judging whether or not components are to be sucked or released even though a plurality of types of nozzles are used. For this reason, in a surface mounter that replaces a plurality of nozzles, there is a certain limit in the reliability of determination of component suction or suction release based on a specified value, and there is a demand for a technology that improves reliability over the past.

Further, such a problem is not caused only by the type of nozzle, but also occurs in a surface mounter that suctions and conveys various kinds of components. That is, even when different kinds of parts are selectively sucked by the same nozzle, the pressure levels in the nozzles are different from each other according to the size, shape, material, etc. of the parts, and a single specified value is set. The conventional technique used as a judgment index has a problem in reliability.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a surface mounter capable of accurately determining whether or not a component is being sucked by a suction nozzle.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention suctions a component of a component supply section by a suction nozzle attached to a mounting head, and mounts the mounting head in the suction state. After moving to the component mounting section, in the surface mounter that releases the component suction by the suction nozzle and mounts the component on the printed circuit board of the component mounting section,
A pressure detecting means for detecting the pressure in the suction nozzle; a predetermined value set in accordance with the suction nozzle, the component, or a combination of the suction nozzle and the component; and a pressure value detected by the pressure detecting means. And a control means for making an adsorption determination by comparing with the specified value (claim 1).

In this surface mounter, a suction nozzle, components,
Alternatively, a specified value is set according to the combination of the suction nozzle and the component. Then, when picking up the component by the suction nozzle or canceling the component suction by the suction nozzle, the pressure in the suction nozzle is detected by the pressure detecting means, and the detection result is compared with the specified value to pick up the component. It is determined whether or not suction is performed by the nozzle. As described above, since the specified value set in accordance with the suction nozzle, the component, or the combination of the suction nozzle and the component is used as the determination index, it is possible to accurately determine the suction of the component.

There are surface mounters in which a plurality of types of suction nozzles are detachable from a mounting head. In this case, as a configuration for setting the specified value, the control means sets, for each suction nozzle, the pressure in the nozzle when the suction port of the suction nozzle is opened to the minimum negative pressure value, A storage unit for storing the pressure in the nozzle when the suction port is closed as a maximum negative pressure value, and a minimum negative pressure value and a maximum negative pressure value corresponding to the suction nozzle attached to the mounting head. A specified value setting unit for reading at least one from the storage unit and calculating and setting a specified value based on the read data may be provided.

In this case, the state in which the component is not sucked by the suction nozzle, that is, the pressure in the nozzle when the suction port of the suction nozzle is opened is stored as the minimum negative pressure value, while the component is held by the suction nozzle. The pressure in the nozzle in the suction state, that is, when the suction port of the suction nozzle is closed, is stored as the maximum negative pressure value. Since the specified value is calculated and set based on these data, the specified value corresponding to the suction nozzle can be appropriately obtained, and the determination accuracy can be improved.

In addition to the calculation of the specified value based on the maximum negative pressure value and the minimum negative pressure value, the specified value may be calculated and set in consideration of the type of component. Item 3).

According to this configuration, the specified value can be optimized, and the determination accuracy can be further increased. If the same suction nozzle selectively picks up multiple types of parts, the negative pressure level inside the suction nozzle may differ depending on the size, shape, material, etc. of the parts. If the specified value is determined in consideration of the component type in addition to the minimum negative pressure value as in the configuration, the specified value can be set more accurately and more appropriately.

In the surface mounter, a plurality of types of suction nozzles are detachable from a mounting head, and at least one of the plurality of suction nozzles selectively suctions a plurality of types of components. Some are configured to do so. In this case, as a configuration for setting the specified value, the control means sets, for each combination of the suction nozzle and the component, the pressure in the nozzle when the suction port of the suction nozzle is opened to the minimum negative pressure value. A storage unit for storing the pressure in the nozzle when the suction port of the suction nozzle is closed by a component as a maximum negative pressure value, and a suction nozzle attached to the mounting head and a suction target. A specified value setting unit that reads at least one of the minimum negative pressure value and the maximum negative pressure value corresponding to the combination with the component from the storage unit and calculates and sets a specified value based on the read data can be provided. 4).

Here, the state in which the component is not being sucked by the suction nozzle, that is, the pressure in the nozzle when the suction port of the suction nozzle is opened is stored as the minimum negative pressure value, while each component is stored by the suction nozzle. Is stored, that is, the pressure in the nozzle when the suction port of the suction nozzle is closed by each component is stored as the maximum negative pressure value. Since the specified value is calculated and set based on these data, the specified value corresponding to the suction nozzle and the component can be appropriately obtained, and the determination accuracy can be improved.

Further, nozzle clogging may occur during the operation of the surface mounter. In this case, the controller reads out at least one of the minimum negative pressure value and the maximum negative pressure value corresponding to the suction nozzle attached to the mounting head from the storage unit, and calculates and sets a specified value based on the read data. On the other hand, it is desirable to further provide a nozzle clogging determination unit that compares the specified value with the pressure in the suction nozzle attached to the mounting head in the open state to determine nozzle clogging.

In this case, the specified value corresponding to the suction nozzle is calculated and set, and nozzle clogging is determined based on the specified value. Therefore, the specified value is not affected by the shape and size of the suction nozzle. In addition, nozzle clogging can be accurately determined.

[0019]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 schematically show an example of the entire structure of a surface mounter to which the present invention is applied. In these figures, on the base 1,
A conveyor 2 constituting a transport line is arranged, and the printed circuit board 3 is transported on the conveyor 2 and stopped at a predetermined work position (component mounting section).

At the side of the conveyor 2, a component supply unit 4
Is arranged. The component supply unit 4 includes, for example, a plurality of rows of tape feeders 4a. Each of the tape feeders 4a stores and holds small pieces of electronic components such as ICs, transistors, and capacitors at predetermined intervals. The tape feed end is provided with a feed mechanism, and the tape is intermittently fed as components are picked up by a head unit 5 described later.

A head unit 5 is mounted above the base 1. The head unit 5 is movable across the component supply unit 4 and the printed circuit board 3 conveyed to a predetermined work position.
It can move in the axial direction (the direction of the conveyor 2) and the Y-axis direction (the direction orthogonal to the X-axis on a horizontal plane).

That is, a pair of fixed rails 7 extending in the Y-axis direction and a ball screw shaft 8 driven to rotate by a Y-axis servomotor 9 are disposed on the base 1. A head unit support member 11 is disposed on the support member 11, and a nut portion 12 provided on the support member 11 is screwed to the ball screw shaft 8.

A guide member 13 extending in the X-axis direction and a ball screw shaft 14 driven by an X-axis servomotor 15 are disposed on the support member 11, and the head unit 5 is mounted on the guide member 13. The head unit 5 is movably held and a nut portion 16 provided on the head unit 5 is screwed to the ball screw shaft 14. The operation of the Y-axis servomotor 9 rotates the ball screw shaft 8 to move the support member 11 in the Y-axis direction, and the operation of the X-axis servomotor 15 rotates the ball screw shaft 14 to rotate the head unit 5. Move in the X-axis direction with respect to the support member 11.

The head unit 5 is provided with one or a plurality of mounting heads for adsorbing components. In this embodiment, a case in which one mounting head 20 is provided for easy understanding of the invention. I do. This head 20
The suction nozzle 21 is detachably attached to the tip of a hollow nozzle shaft (not shown). The suction nozzle 21 moves in the Z-axis direction (up and down direction in FIG. Rotation about an axis (nozzle center axis) is enabled, and the Z-axis servo motor 22 operates in the Z-axis direction and the R-axis servo motor 23 rotates. The nozzle 21 is connected to a negative pressure generator 24 (FIG. 3) via a nozzle shaft, a valve, and the like, so that a negative pressure for component suction is supplied to the nozzle 21 when necessary. Further, when the suction of the components is released, the nozzle 21 is connected to the positive pressure generating unit 25 (FIG. 3) via a switching valve or the like in order to assist the detachment of the components from the opening at the tip of the nozzle 21, that is, the suction port. It is connected so that a positive pressure for mounting is supplied to the nozzle 21 when necessary.

Further, the base 1 is provided with a nozzle exchange station 19 for exchangeably holding the nozzle 21 mounted on the head unit 5. When the nozzle is exchanged, the head is located above the nozzle exchange station 19. The unit 5 is set.

Next, an embodiment of the configuration of a control system having a function such as component suction determination in the mounting machine will be described.
This will be described with reference to the block diagram of FIG.

A control unit 30 as shown in FIG. 3 is mounted on the mounting machine, and it is determined whether or not a component is sucked by the nozzle 21, and the entire mounting machine is used while utilizing the determination result. Control. In the above mounting machine,
A pressure sensor 31 for detecting a pressure value in the nozzle 21 and an external storage unit 32 such as a magnetic disk are provided.

The control unit 30 controls the Y axis and the X axis.
The axis servomotors 9 and 15, the Z axis of the head unit 5 and the servomotors 22 and 23, the negative pressure generator 24, the positive pressure generator 25, the pressure sensor 31, and the like are all included in the control unit 30.
Are electrically connected to each other, and are controlled collectively by the control unit 30. More specifically, a main processing unit 301 that performs overall control of a component suction determination and a component mounting operation in an operation flow described in detail below, an axis control unit 302 controlled by the main processing unit 301, an operation program of a mounting machine,
The control unit 30 includes an execution program for a data acquisition process described later and an internal storage unit 303 for storing various data obtained by executing the operation programs.
It is provided in.

The main operation unit 301 controls the servo motor and the like via the axis control unit 302 according to the operation program, thereby obtaining
The head unit 5 is moved between the printed circuit board 3 positioned at the component mounting unit, the component supply unit 4, and the nozzle replacement station 19. That is, the head unit 5
Is moved to the component supply unit 4 to execute the component suction by the nozzle 21, and after confirming the component suction, the head unit 5 is moved onto the printed circuit board 3 and the component suction by the nozzle 21 is released to print the component. It is mounted on the substrate 3.
Further, the head unit 5 is moved to the nozzle replacement station 19 as needed, and the nozzle 21 is replaced.

Further, in the control unit 30, in the control unit 30, the main arithmetic unit 301 executes a data acquisition process prior to the actual mounting operation, and stores a plurality of negative pressure data in the internal storage unit 303 in order to confirm the suction and release of the components. In addition to storing the data, the data corresponding to the nozzle 21 mounted on the head unit 5 is read out of the plurality of negative pressure data stored in the internal storage unit 303 during the mounting operation, and a specified negative pressure value serving as a determination index is set. Then, it is determined whether or not the component is being sucked by the nozzle 21 by comparing with the detection result of the pressure sensor 31. As described above, in this embodiment, the control unit 30 and the pressure sensor 31 constitute a component suction determination device according to the present invention. The main calculation unit 301 in the control unit 30 functions as a specified value setting unit as described later. Hereinafter, the data acquisition processing and the mounting processing will be described in detail.

FIG. 4 is a flowchart showing the contents of the data acquisition process. In this embodiment, the data acquisition process is performed after the assembly of the mounting machine is completed and before the factory shipment.
The program is executed by the control unit 30 according to the program stored in the program 03.

First, in step S11, the head unit 5
Moves to the nozzle replacement station 19 and the nozzle 21 is replaced. Then, in step S12, the negative pressure generator 24
A negative pressure supply control valve (not shown) provided between the nozzle and the nozzle 21 is opened to supply a negative pressure to the nozzle 21 by the negative pressure generating unit 24, and the pressure sensor 31 detects the pressure in the nozzle 21 in step S13. Is detected. At this stage, the suction port of the nozzle 21 is in an open state,
The pressure in the nozzle 21 thus detected is temporarily stored in the internal storage unit 303 as the minimum negative pressure value (Step S14).

When the negative pressure value in the open state, that is, the minimum negative pressure value is obtained, steps S15 and S16 are executed next, and the negative pressure value in the closed state is detected. That is, after the head unit 5 moves above the negative pressure detecting jig (not shown) in step S15, the head unit 5 descends and the suction port of the nozzle 21 is closed by the negative pressure detecting jig. At this time, whether or not the suction port of the nozzle 21 is closed is visually checked by an operator, or a camera is provided near the negative pressure detecting jig, and automatically checked based on the captured image. You may make it.

Then, the negative pressure value in the nozzle 21 in the closed state is detected (step S16), and the detected value is temporarily stored in the internal storage unit 303 as the maximum negative pressure value (step S17). . As described above, the negative pressure value in the open state (minimum negative pressure value) and the negative pressure value in the closed state (maximum negative pressure) of the nozzle 21 mounted in step S11 by the series of processes (steps S11 to S17). Values) are obtained.

In the next step S18, it is determined whether or not the minimum negative pressure value and the maximum negative pressure value have been obtained for all the nozzles to be used in advance. A series of processes (steps S11 to S1
7) is repeated to obtain the minimum negative pressure value and the maximum negative pressure value for each nozzle. Thereby, for example, FIG.
In the correspondence shown in FIG. 5, the internal storage unit 303 associates the nozzle type with the minimum negative pressure value and the maximum negative pressure value.
Is stored.

On the other hand, if "YES" is determined in the step S18, the data (FIG. 5) temporarily stored in the internal storage 303 is written to the external storage 32 (step S19).

FIG. 6 is a flowchart showing the contents of the mounting process. In this embodiment, when the printed circuit board 3 is conveyed on the conveyor 2 and stopped at a predetermined work position (component mounting unit), the main processing unit 301 operates according to the operation program stored in the internal storage unit 303. The components of the apparatus are controlled to execute the mounting process of FIG. Here, first, the head unit 5 is moved to the component supply unit 4 (step S1). Then, the component sucking process described below is executed, and the nozzle 21 sucks and holds the component (Step S).
2).

FIG. 7 is a flowchart showing the contents of the component suction processing. In this component suction processing, the main arithmetic unit 30
1 is the nozzle 2 currently mounted on the head unit 5
The first type is recognized (step S201), and it is determined whether or not the nozzle is appropriate for a component to be mounted now (step S202). Here, if it is determined that the nozzle is not appropriate, the nozzle is exchanged to optimize the nozzle (step S203).

After it is determined in step S202 that the nozzle is a proper nozzle, or after the nozzle is replaced with a proper nozzle in step S203, the main processing unit 301 stores the data stored in the internal storage unit 303 (for example, the data shown in FIG. 5). ), The negative pressure data corresponding to the nozzle 21, that is, the minimum negative pressure value and the maximum negative pressure value are read out (step S204), and the specified negative pressure value is calculated and set based on the negative pressure data and the component type (step S205). ). Here, when obtaining the specified negative pressure value, for example, one of the minimum negative pressure value and the maximum negative pressure value is multiplied by a coefficient to set the specified negative pressure value, or both the minimum negative pressure value and the maximum negative pressure value are set. The specified negative pressure value may be set based on the specified negative pressure value. However, as described in detail in the section of “Problems to be Solved by the Invention”, when different components are sucked by the same nozzle 21, the negative pressure in the nozzle 21 depends on the size, shape and material of the component. The pressure levels can be different from one another. Therefore, when the specified negative pressure value is determined in consideration of the component type in addition to the minimum negative pressure value and the maximum negative pressure value as in this embodiment, the specified negative pressure value is set with higher accuracy and more appropriately. Can be.

In the next step S206, the negative pressure generator 2
The negative pressure supply control valve between the nozzle 4 and the nozzle 21 is opened, and the negative pressure is supplied to the nozzle 21 by the negative pressure generator 24. Subsequently, the head unit 5 descends and sucks the component with the nozzle 21 (step S207). At this time, if the component is firmly sucked, the nozzle 21 is closed by the component, and the pressure value detected by the pressure sensor 31 is equal to or approximately equal to the maximum negative pressure value read in step S204. It should be.

Therefore, in this embodiment, step S2
At 08, it is determined whether or not the pressure value detected by the pressure sensor 31 is equal to or greater than a specified negative pressure value, thereby confirming component suction. That is, when it is determined that the detected pressure value has not reached the specified negative pressure value and the component suction is incomplete (when the determination result in step S208 is “NO”), a predetermined error process is performed ( In step S209, the process proceeds to step S210 to raise the head unit 5. On the other hand, if the detected pressure value is equal to or greater than the specified negative pressure value and it is determined that the component is reliably sucked by the nozzle 21 (if the determination result in step S208 is “YES”), the component is sucked by the nozzle 21 The head unit 5 is lifted while keeping the position (step S
210).

When the component suction is confirmed in this way,
As shown in FIG. 6, after the head unit 5 moves to a position above the printed board while holding the component (step S3), the component is mounted on the printed board 3 by executing the component mounting process in step S4. Is done.

After the component mounting operation has been performed, the processes of steps S201 to S206 are performed while the nozzle 21 is moving from above the printed circuit board 3 to the component supply unit. During this movement, it is determined whether or not the pressure in the nozzle is equal to or less than a specified negative pressure (a value smaller than the minimum negative pressure value or a value closer to the minimum negative pressure value than the maximum negative pressure value even if the pressure is higher than the minimum negative pressure value). Nozzle 21 before being sucked
A check may be made to see if any components remain in the suction state. If the pressure in the nozzle is not lower than the specified negative pressure, error processing is performed. If the pressure is lower than the specified negative pressure, step S2 is performed.
The nozzle descends at 07. By adding this judgment processing,
Even if there is an erroneous determination that is likely to occur when the specified negative pressure value is increased in order to shorten the mounting tact time in step S407 (FIG. 8) described later, or when foreign matter is adhered and adsorbed to the nozzle tip at the time of nozzle replacement. Even if there is, error processing can be performed and the next suction operation can be correctly performed.

FIG. 8 is a flowchart showing the contents of the component mounting process. In this component mounting process, the main processing unit 30
1 is the nozzle 21 currently mounted on the head unit 5
(Step S401), the internal storage unit 30
3 (for example, data shown in FIG. 5)
Among them, the minimum negative pressure value is read as negative pressure data corresponding to the nozzle 21 (step S402), and a specified negative pressure value is calculated and set based on the negative pressure data (step S40).
3). In this embodiment, since a positive pressure is supplied to the nozzle 21 in order to assist the detachment of the component from the nozzle 21 as described later, a half of the minimum negative pressure value is set as the specified negative pressure value. ing. However, it goes without saying that the method of calculating and setting the specified negative pressure value is not limited to this.

In the next step S404, the head 20 descends toward the printed circuit board 3, and the components are placed on the printed circuit board 3. Subsequently, the negative pressure supply control valve is closed, and the supply of the negative pressure to the nozzle 21 is stopped (step S405). Further, as described above, in order to assist the detachment of the parts, the positive pressure supply control valve (not shown) provided between the positive pressure generation unit 25 and the nozzle 21 is opened in step S406 to open the positive pressure generation unit 25. Thus, a positive pressure is supplied to the nozzle 21. At this time, if the component is surely detached from the nozzle 21 and is mounted on the printed circuit board 3, the nozzle 21 is in an open state, and considering that a positive pressure is supplied, the pressure in the nozzle 21 at the time of mounting the component is considered. Should be above atmospheric pressure.

Therefore, in this embodiment, step S4
At 07, it is determined whether or not the pressure value detected by the pressure sensor 31 is equal to or less than a specified negative pressure value, and component mounting is confirmed. That is, when it is determined that the detected pressure value exceeds the specified negative pressure value and that the part separation is incomplete (step S407).
If the result of the determination is "NO"), after a predetermined error process is performed (step S408), the process proceeds to step S409, and the head 21 is raised. On the other hand, the detected pressure value is equal to or lower than the specified negative pressure value, and
Is determined to be attached to the camera (step S407)
Is "YES"), the head 21 is raised (step S409).

When the component mounting is confirmed in this way,
As shown in FIG. 6, in step S5, it is determined whether component mounting on the printed circuit board 3 has been completed for all components. Unless component mounting is completed, the process returns to step S1 to return to the series of processes (step S1). To S5) are repeated.

As described above, in the above-described mounting machine, when picking up a component, the specified negative pressure value corresponding to each nozzle 21 and the type of the component is set as a judgment index, and the pressure in the nozzle 21 at which the component is sucked is set. Is compared with the above-mentioned specified negative pressure value to determine whether or not the component 21 is reliably sucked by the nozzle 21. Also, at the time of component mounting, a specified negative pressure value corresponding to each nozzle 21 is set as a determination index,
The pressure in the nozzle 21 on which the component is mounted is compared with the specified negative pressure value (the pressure value is a negative value when the pressure is higher than the atmospheric pressure because the pressure is compared using the negative pressure value). Accordingly, it is determined whether or not the component suction by the nozzle 21 has been completely released. That is, when the pressure value is close to 0 (atmospheric pressure) or positive pressure, the pressure becomes smaller than the specified negative pressure value, and it is determined that the component suction is completely released.

As described above, according to this embodiment, the specified negative pressure value is calculated and set according to the nozzle 21 or the combination of the nozzle 21 and the component, and the component is sucked by the nozzle based on the specified negative pressure value. Since it is determined whether or not the determination is made, the determination can be accurately performed. In particular, a mounting machine that handles a wide variety of components has a large number of nozzle types and component types, but this can be dealt with precisely, and by applying this component suction determination device to a mounting machine, And a highly accurate mounting machine can be obtained.

The control at the time of mounting the components is as follows. In order to shorten the mounting tact time, before the negative pressure in the nozzle 21 becomes sufficiently positive due to the supply of the positive pressure, the negative pressure in the nozzle 21 is not reduced.
The nozzle 21 can also be raised. That is, if the component is in contact with the adhesive paste printed on the printed circuit board 3, the adhesive force of the adhesive paste acts on the component even if the inside of the nozzle 21 does not become completely positive, and the nozzle 21 rises. This is because the parts remain mounted even if they are made to do so.
When the negative pressure at the time of releasing the suction is larger than the minimum negative pressure measured by opening the nozzle 21 with the negative pressure applied to the nozzle 21, the prescribed value used for the determination of the suction release is set to the minimum negative pressure. By making it larger than the pressure value, the time until the suction release determination is made can be shortened, and the mounting tact time can be shortened.

In the above embodiment, the maximum negative pressure value of each nozzle 21 is detected by using a negative pressure detecting jig at the time of data acquisition processing. Alternatively, the maximum negative pressure value may be detected using the same dummy chip as the actual component mounted on the printed circuit board 3. Since the mounting machine usually handles a plurality of types of components, it is necessary to prepare a dummy chip of these components in advance, and to detect the maximum negative pressure value while replacing the dummy chip for each nozzle, and this is detected. The data is constituted by negative pressure values corresponding to combinations of nozzle types and component types, for example, as shown in FIG.

In the above embodiment, the minimum negative pressure value and the maximum negative pressure value corresponding to each nozzle are determined while replacing the nozzle 21. However, the same dummy chip as a plurality of types of parts is prepared in advance. Alternatively, the minimum negative pressure value and the maximum negative pressure value corresponding to each component may be obtained while replacing the dummy chip instead of replacing the nozzle.

In the above embodiment, the minimum negative pressure value and the maximum negative pressure value are detected in accordance with the nozzle 21, the component, or the combination of the nozzle 21 and the component.
Although the specified negative pressure value is set as the determination index based on the type of negative pressure value, it is not always necessary to detect two types of negative pressure values in order to set the specified negative pressure value.
A single negative pressure value is detected according to the nozzle 21 and the like,
The specified negative pressure value may be set as a determination index based on the negative pressure value.

In the above embodiment, the case where one head 21 is mounted on the head unit 5 and one nozzle 21 is mounted on the head 20 has been described. However, a plurality of nozzles are mounted on the head unit 5. The present invention can be applied to the mounted mounting machine in exactly the same manner as described above. As a form in which a plurality of nozzles are arranged in the head unit 5, for example, as described in JP-A-8-249033, a plurality of heads arranged in the X-axis direction are provided with nozzles, −26
As described in Japanese Patent No. 1196, a plurality of nozzles may be radially arranged on the head.

In the above-described embodiment, after the assembly of the mounting machine is completed, data for executing a data acquisition process and setting a specified negative pressure value before shipment from the factory (maximum negative pressure value and minimum negative pressure value). Is obtained and stored in a storage unit such as the internal storage unit 303 or the external storage unit 32. However, the execution timing of the data acquisition process is not limited to this. May be. In this case, the data acquisition process may be performed on the user side, but in order to reduce the burden on the user, the suction state is imaged using the camera as described above, and the data is automatically generated based on the image. It is desirable to configure as required.

Further, in the above mounting machine, nozzle clogging may occur during use of the nozzle. Here, if nozzle clogging occurs, the negative pressure value in the nozzle increases even though no component suction is performed, and the reliability of suction determination may be reduced. Therefore, it is desired to periodically detect nozzle clogging. As a concrete detection method, for example, it is conceivable to detect nozzle pressure by periodically detecting the pressure in the nozzle and comparing the detection result with a determination index.

Here, in order to enhance the detection accuracy of nozzle clogging, it is desirable to consider the following points. That is, as in the case of the suction determination, the nozzles have various shapes and opening areas depending on the application, and the pressure levels in the nozzles are different among a plurality of different nozzles. Therefore, in order to eliminate this point, it is desirable to set a judgment index for each nozzle. Hereinafter, a technique for improving the detection accuracy of nozzle clogging will be described with reference to FIG.

FIG. 10 is a flowchart showing an improved embodiment of the mounting machine according to the present invention. In the above mounting machine, at an appropriate timing, for example, its operation time, the number of processed printed boards, the number of mounted components, etc. exceed a predetermined value,
The operation program of the nozzle clogging check process is read from the internal storage unit 303 of the control unit 30, and the main processing unit 301 checks for nozzle clogging according to this operation program.

First, the main processing unit 301 recognizes the type of the nozzle 21 currently mounted on the head unit 5 (step S601), and determines whether or not the nozzle 21 is appropriate for the check target (step S602). ). Here, if it is determined that the nozzle is not appropriate, the nozzle is exchanged to optimize the nozzle (Step S).
603).

After it is determined in step S602 that the nozzle is a proper nozzle, or after the nozzle is replaced with a proper nozzle in step S603, the main processing unit 301 stores data stored in the internal storage unit 303 (for example, as shown in FIG. 5). The negative pressure data corresponding to the nozzle 21 of the data (data), that is, the minimum negative pressure value and the maximum negative pressure value are read out (step S604), and the specified negative pressure value is calculated and set based on these negative pressure data (step S605).

In the next step S606, a negative pressure supply control valve (not shown) is opened, and a negative pressure is supplied to the nozzle 21 by the negative pressure generator 24. At this time, if nozzle clogging has not occurred, the pressure value detected by the pressure sensor 31 should be equal to or approximately equal to the minimum negative pressure value. On the other hand, when nozzle clogging occurs, the pressure value becomes higher than the minimum negative pressure value by an amount corresponding to the degree of clogging.

Therefore, in this improved embodiment, it is determined in step S607 whether or not the pressure value detected by the pressure sensor 31 is equal to or less than a specified negative pressure value, and nozzle clogging is checked. That is, when it is determined that the detected pressure value is equal to or less than the specified negative pressure value and that nozzle clogging has not occurred (the determination result in step S607 is “YES”), the nozzle clogging check process ends.

On the other hand, when it is determined for the first time that the detected pressure value exceeds the specified negative pressure value and nozzle clogging has occurred (the determination result in step S607 is “NO”, and the determination result in step S608 is “NO”). In the case of “YES”, the nozzle clogging is eliminated by executing steps S609 to S611. That is, after closing the negative pressure supply control valve and stopping the negative pressure supply to the nozzle 21 (step S609), the positive pressure supply control valve (not shown) is opened and the positive pressure generation unit 25 applies a positive pressure to the nozzle 21. The pressure supply is started (step S610). Then, when a predetermined time elapses, the positive pressure supply control valve is closed to stop the positive pressure supply (step S611). Thus, the nozzle 21 is prevented from being clogged by supplying the positive pressure to the nozzle 21. Thereafter, the process returns to step 606, where the negative pressure supply control valve is opened again, and the negative pressure is supplied to the nozzle 21 by the negative pressure generating unit 24, and it is determined whether or not the nozzle clogging is eliminated (step 606). S607).

Here, when it is determined that the nozzle clogging has not been eliminated (the determination result in step S607 is "N
O "and the determination result in step S608 is" NO "
), A predetermined error process is executed, and the nozzle clogging check process ends.

As described above, in this improved embodiment, the main calculation unit 301 of the control unit 30 sets a specified negative pressure value corresponding to the nozzle 21 as a determination index, and based on the specified negative pressure value, performs nozzle clogging. Since the determination is made, nozzle clogging can be accurately detected regardless of the type of nozzle. Thus, in the improved embodiment, the main operation unit 3
01 also functions as a nozzle clogging determination unit.

The present invention is applicable to a case where different types of components are selectively sucked and mounted by the same nozzle, or a case where components are suctioned and mounted by a plurality of nozzles.
Judgment as to whether or not the suction has been correctly completed at the time of picking up the component (FIG. 7)
Step S208), it is determined whether or not the component has been correctly mounted at the time of mounting the component (Step S407 in FIG. 8), or it is determined whether or not the nozzle 21 is in the correct suction standby state without any component or foreign matter before the component is suctioned. The present invention is applicable to one in which at least one of the types of determination is performed. In addition, instead of making the specified value constant in each of the above determinations, a plurality of values are set and used according to the nozzle or the like, and a combination of a plurality of specified values set in each of the determinations is different for each type of determination. It is even more desirable to do so.

[0068]

As described above, according to the present invention, a specified value is set in accordance with a suction nozzle, a component, or a combination of a suction nozzle and a component, and the pressure in the suction nozzle and the specified value are determined. Since it is configured to determine whether or not the component is being sucked by the suction nozzle by comparing, it is not affected by the type of the suction nozzle or the component,
It is possible to accurately determine whether or not a component is being sucked by the suction nozzle.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an example of the entire structure of a surface mounter to which the present invention is applied.

FIG. 2 is a schematic front view of the surface mounter.

FIG. 3 is a block diagram showing an embodiment of a configuration of a control system having a function such as component suction determination in the surface mounter of FIGS. 1 and 2;

FIG. 4 is a flowchart showing the contents of a data acquisition process.

FIG. 5 is a diagram illustrating an example of a data structure stored in a storage unit.

FIG. 6 is a flowchart showing the contents of a mounting process.

FIG. 7 is a flowchart showing the contents of a component suction process.

FIG. 8 is a flowchart showing the contents of a component mounting process.

FIG. 9 is a diagram illustrating another example of the data structure stored in the storage unit.

FIG. 10 is a flowchart showing an improved embodiment of the present invention.

[Description of Signs] 3 Printed circuit board 4 Component supply unit 4a Tape feeder 5 Head unit 19 Nozzle replacement station 20 Mounting head 21 Nozzle 24 Negative pressure generation unit 25 Positive pressure generation unit 30 Control unit (control means) 31 Pressure sensor (Pressure) Detection means) 32 External storage unit (storage unit) 301 Main operation unit (prescribed value setting unit, nozzle clogging determination unit) 303 Internal storage unit (storage unit)

Claims (5)

[Claims] A component in a component supply unit is sucked by a suction nozzle attached to a mounting head. After the mounting head is moved to a component mounting unit in the suction state, the component suction by the suction nozzle is performed. In a surface mounter for releasing and mounting the component on the printed circuit board of the component mounting unit, a pressure detection unit configured to detect a pressure in the suction nozzle; and a suction nozzle, the component, or the suction nozzle and the component. And a control means for setting a prescribed value in accordance with a combination of the pressure detection means and comparing the pressure value detected by the pressure detecting means with the prescribed value to make a suction determination. 2. A plurality of types of suction nozzles are detachable from the mounting head, and the control means controls, for each suction nozzle, a nozzle when the suction port of the suction nozzle is open. And a storage unit for storing the pressure inside the nozzle as a maximum negative pressure value when the suction port of the suction nozzle is closed, and a storage unit for storing the pressure inside the nozzle as a maximum negative pressure value. A specified value setting unit configured to read at least one of a minimum negative pressure value and a maximum negative pressure value corresponding to the suction nozzle from the storage unit and to calculate and set a specified value based on the read data. Item 4. The surface mounter according to Item 1. 3. The surface mounter according to claim 2, wherein the specified value setting unit calculates and sets a specified value based on a type of a component to be picked up in addition to the read data. 4. A plurality of types of suction nozzles are detachable from the mounting head, and at least one of the plurality of suction nozzles is configured to selectively suction a plurality of types of components. The control means sets the pressure in the nozzle when the suction port of the suction nozzle is open to the minimum negative pressure value and sets the suction port of the suction nozzle for each combination of the suction nozzle and the component. Corresponding to a combination of a suction nozzle attached to the mounting head and a component to be suctioned, which stores a pressure in the nozzle when the component is closed by the component as a maximum negative pressure value. A specified value setting unit for reading out at least one of the minimum negative pressure value and the maximum negative pressure value from the storage unit and calculating and setting a specified value based on the read data; Surface mounting machine according to claim 1 wherein. 5. The control unit reads at least one of a minimum negative pressure value and a maximum negative pressure value corresponding to a suction nozzle attached to the mounting head from the storage unit,
A nozzle clogging determination unit that calculates and sets a specified value based on the read data and compares the specified value with the pressure in the suction nozzle attached to the mounting head in an open state to determine nozzle clogging. The surface mounter according to any one of claims 2 to 4, wherein the surface mounter is provided.