JPH0365040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an apparatus for constructing an electronic circuit by mounting electronic components, particularly leadless small electronic components (so-called chip components), on a board.

(b) Conventional technology Various methods have been proposed for mounting leadless small electronic components on a board, but one of them is a method in which components are picked up one by one with a mounting head that uses vacuum suction and then bonded. There are some that are pressed onto a board coated with a solder paste or solder paste. In this method, carrier tape, magazine,
The parts are sucked up from a supply means such as a toilet or parts feeder, but if the parts arrive at the suction point in an inclined state, or if the parts are lifted up due to machine vibrations at the moment of suction, the mounting head may In some cases, instead of the normal side (top) of the holder, the other side, which has a small surface area when comparing the areas, was attracted. If this component is left unattended, it will be attached to the board in the same position and the electronic circuit will not be configured properly. Although such a situation does not occur often, if it does occur, the entire board must be treated as a defective product. In particular, in recent years, many boards are equipped with dozens or more of small leadless electronic components on each board, and it is a huge loss to have such a board defective due to a single mounting error. .

(C) Problems to be Solved by the Invention An object of the present invention is to provide an electronic component mounting device that does not mount electronic components in an abnormal posture.

(d) Means for Solving the Problems In the present invention, a mounting head that can select between an adsorption state and a non-adsorption state and that can advance toward a target and retreat from there can be moved to a plurality of work stations using a mounting head moving means. Move sequentially. The work station includes a suction station that suctions parts and a mounting station that mounts the suctioned parts onto a board.In addition, a suction error detection station is placed between the suction station and the mounting station. An abandonment station is placed between the station and the suction station. The suction error detection station detects the light emitted when a part is suctioned to the mounting head with the normal side on the movement trajectory and when the part is suctioned with the other side. An optical attitude determination device will be installed to detect suction errors based on differences in the way they are blocked.

(E) Work The mounting head that enters the suction station is given forward and backward movement to suction the parts. The mounting head then moves to the suction error detection station. The mounting head that has entered the suction error detection station exposes the component to the optical attitude determination device without moving forward or backward. A component that is picked up with a side other than the normal side is determined to have been picked up incorrectly by the optical attitude determination device, and is discarded at the abandonment station.

(F) Embodiment In the figure, reference numeral 1 denotes an index table that rotates around a vertical axis, and constitutes a means for moving a mounting head, which will be described later. As seen in FIG. 2, index table 1 is connected to upper table 2.
and a lower table 3, both of which are fixed to a vertical index shaft 4.
The index shaft 4 is supported in a hanging state by a bearing portion 6 of a support beam 5, and is connected to an index device main body 7 on the beam. The inside of the index shaft 4 is an air intake passage 8 communicating with a vacuum source (not shown). Now, index table 1 is
It rotates in steps of 45 degrees, and eight work stations are arranged around it, and eight arms 9 are made to protrude radially from the lower table 3 accordingly. Among the work stations, is a suction station, is a suction error detection station, is a mounting station, and is a radiation station.

The arm 9 is supported by a slider 10 attached perpendicularly to the peripheral surface of the lower table 3, and is movable in the vertical direction. The slider 10 is connected to the upper table 2 by a spring 11 stretched between the slider 10 and the upper table 2.
It is pulled up until it hits the stopper bolt 12 screwed into. The slide 10 has an outwardly projecting roller 13 which is subjected to the pressing action of a tappet 14 at the suction station. Similar tappets are located at mounting stations and other necessary work stations, both of which are raised and lowered by cam action.

Arm 9 supports a mounting head 15 at its tip.
As the arm 9 descends, the mounting head 15 advances, and as the arm 9 rises, the mounting head 15 retreats. The mounting head 15 is hollow, has a hose 16 connected to its upper end, and has a suction nozzle 17 protruding from its lower end. The nozzle 17 is adapted to be slidable relative to the mounting head 15 and is normally pushed into the extended position by a spring 18. The other end of the hose 16 is connected to a valve 19 fixed to the upper table 2. The valve 19 is connected to the intake path 8 by a hose 20, and the suction power is turned on and off.
It is something that performs an action. The opening/closing operation of the valve 19 is performed by a lever type actuator 2 having a roller at the tip.
This is done according to 1. That is, when the actuator 21 is pushed down, the valve is open, and when not, the valve is closed. The actuator 21 is controlled by a cam 23 that is moved up and down by an air cylinder 22 at the suction station, and by a cam 25 that is moved up and down by an air cylinder 24 at the mounting station and abandonment station, and between the stations therebetween and the suction error detection station. In this case, a cam 26 fixed to the bearing part 6 is used. The cam 26 is connected to the air cylinders 22, 24
The cams 23 and 25 also serve as support members for the cam 26, and when lowered, the cams 23 and 25 form a plane substantially continuous with the cam 26. Since each valve 19 is arranged in a lagging position with respect to the mounting head 15 to which it belongs,
The cams 23, 25 are also located at positions offset from the station to which they belong.

27 is a carrier tape for supplying parts arranged on the suction station. Carrier tape 27
In this method, flat hexahedral parts 28 are dropped one by one into through holes punched at regular intervals in a cardboard base.
Both sides are sealed with plastic film, and only the upper film 29 is peeled off just before the suction position. On the other hand, an XY table 31 on which a board 30 is placed is arranged at the mounting station, and a parts recovery box 32 is arranged at the abandonment station.
is placed. Reference numeral 33 denotes an optical attitude determination device disposed in the suction error detection station. This is composed of a photocoupler, and its optical path is directed to the tip space of the mounting head 15 (to be precise, the nozzle 17
It is arranged so as to cross the movement locus of the space at the tip of the part 28 (the space in which the suctioned part 28 occupies the position). In the embodiment, it is placed at a height that crosses directly below the component 28 that has been successfully suctioned.

Next, the action will be explained. 4 and 5 show the fist movements of the mounting head 15 at the suction station, the suction error detection station, the mounting station, and the abandonment station at specific times. 2 corresponds to FIG. 4, and FIG. 3 corresponds to FIG. 5. FIG. 4 shows a state in which each mounting head 15 has just moved from the previous work station and stopped. At the suction station, the cam 23 is still in the raised state;
The mounting head 15 has not started suctioning. In the mounting head 15 located at the station and the suction error detection station, the valve 19 is kept open by the action of the cam 26, and the component 28 is suctioned and held. The mounting head 15 that has entered the suction error detection station picks up the suctioned parts 28.
is exposed to the optical attitude determination device 33 on a movement trajectory without advancing or retreating. If the component 28 is attracted in a normal posture as shown in the figure, that is, in a posture with the largest area side facing upward, the component will not cast a shadow on the optical path of the optical posture determination device 33.
It is determined that there is no problem. At the loading station and abandonment station, the cam 25 is in a lowered state, and the loading head 15 is exerting a suction force. Following this state, the operation shown in FIG. 5 occurs. That is, in the suction station, the slider 10 is pushed down by the tappet 14, and the nozzle 17 of the mounting head 15 hits the component 28. After hitting, the cam 23 descends and the nozzle 17 starts to attract. The slider 10 also descends at the mounting station, and here the picked-up component 28 is pressed against the board 30. Thereafter, the cam 25 rises and stops attracting the component 28.
When the suction of the component 28 is started or finished, the sliders 10 of the suction station and the mounting station are raised, and each mounting head 15 begins to move to the next station. In order not to interrupt the suction of the mounting head 15 coming from the suction error detection station, the cam 25 immediately descends and waits after the slider 10 is raised. On the other hand, the cam 23 rises after the actuator 21 that was being pushed moves below the cam 26, and waits for the next actuator 21.

Next, the operation when the optical attitude determination device 33 discovers a suction error of the component 28 will be explained with reference to FIG. If the component 28 enters the suction error detection station while being suctioned in an upright position with a side other than the normal side, that is, with a side other than the maximum area side, the component 28 enters the suction error detection station. This will block the optical path of the device 33, and it will be determined that the suction has failed. The mounting head 15 for which this determination has been made will not perform a lowering operation when it next moves to the mounting station. The cam 25 also remains in the lowered state until the mounting head 15 moves to the abandonment station, continuing the suction. The mounting head 15 that has moved to the abandonment station is stopped from suctioning when the succeeding mounting head 15 finishes pressing the component onto the board 30 and is cut off from suction, and drops the component 28 into the collection box 32. In addition, if even the subsequent mounting head 15 has caused a suction error,
Head 1 attached during residence at abandonment station
5 will not be cut off, but in this case, when the retention period ends and movement starts, the suction will be released when the actuator 21 leaves the cam 25 and the part 28 will be dropped into the collection box 32. It is something.

Note that there are many leadless electronic components with different dimensions and varying thicknesses, but when mounting many types of components on the same board, the support level of the optical attitude determination device 33 should be adjusted depending on the type. You should try to change it.

(G) Effects of the Invention According to the present invention, parts picked up in a position other than the normal position are detected by the optical position determination device and are not mounted, so there is no board defect caused by mounting the parts in the wrong position. It can be done. In addition, since the component orientation is monitored by crossing the movement trajectory of the distal end space of the mounting head with the optical path of the optical orientation determination device, it does not check the component orientation by applying physical force, which may be undesirable. You can safely dispose of it at the abandonment station without having to drop it somewhere. Since no physical force is applied to the mounting head, the mounting head will not be damaged. Furthermore, since the mounting head that has entered the suction error detection station exposes the component to the optical attitude determination device without moving forward or backward, there is no danger of the component falling even if the component is being suctioned in an unstable posture. In addition, the determination processing time is not consumed by the time consumed in the advancing operation, and most of the residence time at the suction error detection station can be used for the determination processing. Conversely, although the discrimination process must take a certain amount of time, the time required for the mounting head to advance and retreat before and after the process can be cut, so the inspection work at the suction error detection station delays the overall work takt. This can prevent such situations.

[Brief explanation of drawings]

The figures show one embodiment of the apparatus of the present invention, in which FIG. 1 is a top view of an index table, and FIGS. 2 and 3 are partial vertical sectional views showing different operating states of the suction station. Figures 4 to 6 are operation explanatory diagrams, Figures 4 and 5 show the operations at each station at the same time in parallel, and Figure 6 shows the operation when a suction error occurs. This shows the operations at the station step by step. 15... Mounting head, 1... Index table (mounting head moving means), 28... Parts, 3
0...substrate,...adsorption station,...attachment station,...adsorption error detection station,...abandonment station, 33...optical attitude determination device.

Claims (1)

[Scope of Claims] 1. A mounting head that can select between an adsorption state and a non-adsorption state and that can advance towards a target and retreat from there, and a mounting head moving means that sequentially moves this mounting head to a plurality of work stations. The mounting head that has advanced into the suction station is moved forward and backward to pick up the component, and the mounting station is then moved back and forth again to the mounting head to mount the picked-up component onto the board. A suction error detection station that does not cause forward/backward movement is placed between the suction station and the mounting station, and the suction error detection station is used to detect parts that are attracted to the mounting head while being attracted to the correct side on the movement trajectory. Based on the difference in the way the light is blocked when the object is attached to the side and when the object is attached to the other side, an optical posture determination device is installed to detect a suction error, and a suction error detection station is used to detect the suction error. An electronic component mounting device characterized in that an abandonment station is provided between the station and the abandonment station for discarding components found to have been picked up incorrectly.