JP4699251B2 - Nozzle identification method and defect determination method - Google Patents

Description

  The present invention relates to a nozzle identification method and a defect determination method, and more particularly to a nozzle identification method and a defect determination method suitable for application to a holding nozzle used when holding an electronic component and mounting it on a circuit board in a component mounting apparatus. .

  In general, in a component mounting apparatus, an electronic component is sucked from a component supply device by a suction nozzle mounted on a mounting head and mounted at a predetermined position on a positioned circuit board. FIG. 7 is a sectional view showing an example of this suction nozzle.

  Since accurate precision is required for mounting electronic components on a circuit board, it is necessary to mount the suction nozzle 2 having an appropriate size according to the size of the components to be mounted. The attachment of the suction nozzle 2 is performed by moving the mounting head to the nozzle holder and selecting the suction nozzle 2 having the nozzle tip portion 2A having a size suitable for the component size from the nozzles held there.

  Whether or not the suction nozzle 2 mounted on the mounting head is the target is determined by using an optical means such as a laser sensor as disclosed in Patent Document 1, for example. When the width (hereinafter also referred to as the tip width) is measured and the result matches the nozzle tip width information stored in advance on the machine (component mounting device) side, it is automatically determined that the nozzle is the target. Identification and confirmation is performed.

  Such automatic nozzle identification by tip width measurement is generally performed optically in the case of a component mounting apparatus that uses only suction nozzles that select and mount nozzles having different tip widths for each target component size. There is no particular problem because the tip width can be easily specified from both ends in the detected width direction.

Japanese Patent Laid-Open No. 10-163691

  However, the nozzle used for mounting the electronic component on the board includes a holding nozzle that holds the electronic component as shown in the cross-sectional view of FIG. 8 between the fixed holding piece 6 and the movable holding piece 8 from both sides. When this is used together with the suction nozzle in the same machine, there may be a case where the same or similar dimensions are mixed in the information about the nozzle tip width dimension stored in advance in the machine. There is a problem that automatic identification is not possible.

  Further, when the movable holding piece 8 is lowered in a defective state in which the movable holding piece 8 is not completely opened as shown in FIG. 9A and a holding operation is performed on the electronic component P, the holding nozzle is moved to the holding nozzle as shown in FIG. If the electronic component P is held in a defective state in which the movable holding piece 8 is not completely closed, the component P is held in an unstable state. There is a problem that it may cause mounting failure.

  The present invention was made to solve the above-mentioned conventional problems, and in order to use the suction nozzle and the holding nozzle in the same machine, even when the same or similar (approximate) tip width information is mixed, It is a first object to provide a nozzle identification method capable of reliably identifying a pinching nozzle.

  It is a second object of the present invention to provide a nozzle failure determination method that can reliably determine whether or not the opening / closing operation of the holding piece of the holding nozzle is defective before component mounting. And

  In the present invention, after mounting the nozzle on the mounting head, the tip width of the nozzle is detected by optical means, the detected tip width of the nozzle is compared with the tip width information stored in advance, and the mounted nozzle is detected. A method for identifying a nozzle to be identified, wherein the detection of the tip end width of the nozzle by the optical means is performed when commanding and non-commanding the opening operation of the gripping piece with respect to the gripping nozzle, and is detected when commanding and non-commanding, respectively. The first problem is solved by identifying the holding nozzle and the suction nozzle on the basis of the difference in the tip width.

  The present invention also provides a nozzle defect determination method for detecting a defect of a mounted nozzle based on the detected nozzle tip width after the tip width of the nozzle is detected by engineering means after the holding nozzle is mounted on the mounting head. The detection of the tip width of the nozzle by the optical means is performed at the time of commanding and non-commanding the opening operation of the gripping piece with respect to the gripping nozzle, and the tip width detected at the time of commanding and non-commanding, The second problem is solved by determining whether the holding nozzle is defective based on a difference from each reference width obtained in advance.

  According to the first aspect of the present invention, since the holding nozzle is used in addition to the suction nozzle, the control for instructing the opening / closing operation of the holding nozzle is performed even when there is information of the same or similar dimension on the tip width of the nozzle. In addition, it is possible to determine whether or not the opening / closing operation has been executed by detecting the tip width at the time of commanding and at the time of non-commanding, and it is possible to reliably identify the holding nozzle and the suction nozzle from the result.

  According to the invention of claim 2, since the tip width is detected before and after the opening and closing operation of the holding nozzle, the defective state of the nozzle can be easily and easily detected by the deviation of the detected tip width from the reference value. It can be determined with certainty.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a main part of a component mounting apparatus applied to the nozzle identification method according to the first embodiment of the present invention.

  The component mounting apparatus applied to the present embodiment includes a mounting head 10 for mounting electronic components on a circuit board (not shown).

  The mounting head 10 includes a shaft 12 on which a nozzle is mounted at the tip, a movable frame 14 that rotatably supports the shaft 12, a θ-axis motor 16 that rotates the shaft 12 about its axis, and the shaft 12. And a Z-axis motor 18 that moves up and down integrally with the movable frame 14.

  The mounting head 10 is moved in the plane direction by an XY drive mechanism (not shown) and positioned above the nozzle holder 20, and then the shaft 12 is lowered by the Z-axis motor 18 to move the target suction nozzle 2 and holding nozzle 4. The state shown in the figure can be achieved by mounting and lifting the tip. Incidentally, the holding nozzle 4 is attached in FIG.

  Further, the suction nozzle 2 and the holding nozzle 4 mounted on the shaft 12 as described above are arranged between the light emitting part 32 and the light receiving part 34 of the laser sensor (optical means) 30 as schematically shown in FIG. By disposing the nozzle, the nozzle tip width can be detected (measured) from the dimensions of both side ends that block the laser beam. Although not shown in FIG. 1, the laser lance 30 is attached to the mounting head 10 at a position where the nozzle 4 can be reached by the Z-axis motor 18.

  Further, as the light emitting unit 32 constituting the laser sensor 30, a light receiving unit 34 that is irradiated with parallel light by combining a laser diode and a collimator lens as disclosed in JP-A-7-790945 is used. Can use a linear sensor comprising a CCD array.

  In the present embodiment, the mounting head 10 is moved onto the nozzle holder 20 and either the suction nozzle 2 as shown in FIG. 7 or the holding nozzle 4 as shown in FIG. 8 is selected. Is attached to the shaft 12. As this holding nozzle 4, what is disclosed by Unexamined-Japanese-Patent No. 2002-361587 can be mentioned.

  As shown in FIG. 3, when the compressed air is supplied as a driving source in the direction of the arrow through the shaft 12 in the state of the tip dimension A where the movable holding piece 8 is closed, the holding nozzle 4 resists the biasing force of the spring. When the drive shaft 4A moves downward and the engagement pin 4B pushes down the engagement arm, the movable gripping piece 8 is rotated outwardly about the rotation pin 8A, and the open end dimension B shown in FIG. It is possible to be in the state.

  Here, as shown in FIG. 1, the control device 40 controls the supply of compressed air to the shaft 12 on which the holding nozzle 4 is mounted from the compressor 42 and shuts off the command, and the laser sensor 30 (see FIG. 1). No. 2) is controlled, and a nozzle identification operation, which will be described later, is executed by a detection signal input from the sensor 30.

  A nozzle identification method will be described with reference to the flowchart of FIG. 5 by taking as an example a case where the suction nozzle 2 and the holding nozzle 4 having substantially the same tip size are mounted on the mounting head 10 by the component mounting apparatus having the above configuration.

  First, the mounting head 10 is moved above the nozzle holder 20, a nozzle at a predetermined position is attached to the tip of the shaft 12 (step 1), the Z-axis motor 18 is driven, and the tip of the nozzle is moved to the laser sensor 30. The nozzle width (tip width) detected by the light receiving unit 34 is acquired (step 3) by matching with a specific position that blocks the laser light emitted from the light emitting unit 32 (step 3).

  Next, with respect to the acquired nozzle width, width data (tip width information) stored in a memory (not shown) of the control device 40 is checked, and whether or not there are a plurality of nozzles having similar or identical tip widths, that is, Then, it is determined whether or not the nozzle can be identified (step 4). If similar dimension data is not registered, the corresponding nozzle number is assigned and the nozzle identification is terminated (step 5).

  On the other hand, if the same (or similar) tip width data is registered in step 4, a command signal is output from the control device 40 and pressurized air is supplied from the compressor 42 to the shaft 12, and When shutting off, the laser sensor 30 detects each and acquires the nozzle width (step 6), and whether there is a change (difference) in the nozzle width during supply and when shutting (when opening command is given and when not commanding) It is determined whether or not (step 7). As a result, if there is a change in the tip dimension as shown in FIGS. 3 and 4, it is determined that it is a sandwiching nozzle 4 (step 8), the corresponding nozzle number is assigned, and the identification is completed (step 9). .

  On the other hand, when there is no change (difference) in the tip dimension in step 7, it is determined that the nozzle is the suction nozzle 2 (step 10), the corresponding nozzle number is assigned, and the identification is finished (step 11).

  According to the embodiment described above in detail, the following effects can be obtained.

  (1) For example, as disclosed in Patent Document 1, it is possible to reliably and inexpensively identify a nozzle without providing a dedicated mark such as a notch for identifying the nozzle.

  (2) Since the nozzle can be identified using a laser sensor that is generally used for recognition of electronic components, the nozzle can be identified easily and inexpensively.

  Next, a nozzle defect determination method according to the second embodiment of the present invention will be described with reference to the flowchart shown in FIG.

  In this defect determination, the operation corresponding to step 6 is performed on the holding nozzle 4 in the normal state, and the normal dimension A at the time of closing and the normal dimension B at the time of opening are detected in advance, Is registered as a reference value, and an allowable value used in determining a defect is set in advance.

  First, the holding nozzle 4 is mounted on the mounting head 10 in the same manner as in step 1 (step 21), and the nozzle tip is positioned at the detection position by the laser sensor 30 by the Z-axis motor 18 as in step 2 ( Step 22) Next, as in Step 6 above, the nozzle tip width is detected and acquired when pressurized air is supplied and when it is shut off, and whether or not the detected value is within an allowable value compared to the reference value. (Step 24). If the detected value is within the allowable value, it is determined that the nozzle is a normal nozzle (step 25), and if it is outside the allowable value, it is determined that the nozzle is an abnormal nozzle (step 26).

  The following effects can be obtained by periodically performing the above-described defect determination operation.

  (3) Since it is possible to determine whether or not the holding nozzle is defective by using a laser sensor that is generally used for recognition of electronic components, it is possible to easily and inexpensively determine nozzle failure.

  (4) Since nozzle defects can be found in advance, parts can be prevented from being damaged or mounting defects can be prevented, so that electronic components can be mounted reliably.

The schematic diagram including the block diagram which shows the principal part of the component mounting apparatus applied to 1st Embodiment which concerns on this invention Explanatory drawing which shows typically the relationship between the laser sensor used for this embodiment, and a nozzle. Sectional drawing which shows the state at the time of closing of a clamping nozzle Sectional drawing which shows the state at the time of opening of a clamping nozzle Flow chart showing processing procedure of nozzle identification method Flow chart showing the processing procedure when determining nozzle failure Sectional drawing showing an example of a suction nozzle Sectional drawing which shows an example of a clamping nozzle Sectional view showing problems caused by defective holding nozzle

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Adsorption nozzle 2A ... Tip part 4 ... Gripping nozzle 6 ... Fixed clamping piece 8 ... Movable clamping piece 10 ... Mount head 12 ... Shaft 14 ... Movable frame 16 ... θ-axis motor 18 ... Z-axis motor
DESCRIPTION OF SYMBOLS 20 ... Nozzle holder 30 ... Laser sensor 32 ... Light emission part 34 ... Light receiving part 40 ... Control apparatus 42 ... Compressor

Claims (2)

After mounting the nozzle on the mounting head, the tip width of the nozzle is detected by optical means, the detected tip width of the nozzle is compared with the tip width information stored in advance, and the nozzle that identifies the mounted nozzle is identified. An identification method,
The detection of the tip width of the nozzle by the optical means is executed at the time of commanding and non-commanding the opening operation of the gripping piece with respect to the gripping nozzle,
A method for identifying a nozzle, characterized in that a pinching nozzle and a suction nozzle are identified based on a difference in tip width detected when commanded and when not commanded. After mounting the holding nozzle on the mounting head, a nozzle defect determination method for detecting the tip width of the nozzle by optical means and determining the defect of the nozzle mounted from the detected nozzle tip width,
The detection of the tip width of the nozzle by the optical means is executed at the time of commanding and non-commanding the opening operation of the gripping piece with respect to the gripping nozzle,
A defect determination method for a nozzle, wherein a defect of a holding nozzle is determined based on a difference between a tip width detected at the time of commanding and at a time of non-commanding, and a reference width obtained in advance.

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