JP2512291B2 - Electronic component mounting equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component mounting apparatus for mounting various types of small parts at predetermined positions, and more particularly to various types of electronic parts stored on a tape reel. The present invention relates to an electronic component mounting apparatus suitable for mounting a board on a printed circuit board at high speed. 2. Description of the Related Art Conventionally, an electronic component mounting apparatus for transferring various kinds of electronic components on a printed circuit board reciprocates left and right as disclosed in Japanese Patent Laid-Open No. 55-118698. In addition, the electronic component supply unit is placed on the component supply table that stops at a predetermined position, and the electronic component supply unit is structured such that the electronic component supply unit moves each time the transfer head picks up one electronic component. The mechanism is shown in plan view in FIG. The electronic component mounting apparatus mounts a main body base 1, a component supply table 2, a transfer device 3 (a rotary head is shown in FIG. 6) using a rotary head or a rectangular coordinate type robot, and a printed circuit board on which electronic components are to be mounted. The substrate table 4 is used as a main component. Further, as shown in FIG. 7 which is a cross section taken along line VII-VII of FIG. 6, the drive mechanism of the component supply table 2 includes the rack 7, the pinion 8 and the speed reducer for the component supply table 2 on the linear guide 5. There is a method of driving with a motor 10 via 9. In addition, there is also a system in which the ball screw is driven by a DC motor or a stepping motor. On the component supply table 2, a component storage unit, in which a large number of electronic components are aligned and housed, can be placed in parallel in several tens to 100 types. The case where the component storage unit is a tape reel unit will be described as an example. In the component supply table 2, several tens to about 100 types of tape reel units can be placed on the component supply table 2. It has means for taking out individual electronic components in the tape reel unit to a predetermined supply position. Also, a rotary head type transfer device 3
Has a capturing means, for example, a vacuum suction head 3a for capturing a component and mounting the component on a substrate, and a desired number of vacuum suction heads 3a (generally several to several tens) in the circumferential direction. These vacuum suction heads 3 are arranged and supported at intervals.
It has a mechanism (a component attitude correcting means) for causing a to pivot between an electronic component capturing position A and a transfer position B. The substrate table 4 is exemplified as an XY table, but a rotary type or the like other than the XY coordinate type is also used. The component supply table 2 is positioned at a high speed so that the tape reel having the required electronic components is directly below the suction position A of the rotary head 3. In synchronization with the rotary head 3 sucking and rotating the electronic component, the substrate table 4 has a predetermined position on the printed board to which an adhesive is applied immediately below the transfer position B of the rotary head 3. Positioned so that Then
Transfer electronic components to a printed circuit board. The above operation is continuously performed at high speed. Further, as the disclosure of the prior art, there are JP-A-60-52405 and JP-A-49-129275.
The former relates to parts supply in an automobile assembly line, and the latter relates to automobile transmission assembly, which is difficult to use for mounting electronic parts, which is the object of the present invention. DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the conventional device shown in No. 18698, when the electronic parts are no longer on the parts supply table, the whole device is stopped and the parts are replenished. In this type of apparatus in which several electronic parts are transferred at high speed per second, the stop due to this setup time reduces the work amount. Of the 20 to 40 types of parts, the weight of the movable part is several tens of kilograms, and the capacity of the motor is 1
The capacity of the controller may be small at kW or less, but in the case of multiple types (about 100 types), the weight of the movable part is 100 kg.
Above all, and at higher speeds (for example, 0.2 to 0.4 seconds / piece), the capacity of the motor and controller also increases, which is not economical. In addition, in the case of various kinds of parts supply tables, the ones having a length of several meters are used, and it is technically extremely difficult to drive at high speed in terms of control. Further, since a heavy object of 100 kg or more is repeatedly moved and stopped at high speed, its vibration and noise also become large, and as a high-accuracy mounting device, the mounting performance and the strength of the constituent members may be deteriorated. There are various problems such that the structure of the position detecting means for high precision positioning becomes complicated and the manufacturing cost becomes high. An object of the present invention is to provide a component mounting apparatus capable of reducing or eliminating the down time of the entire apparatus for replenishing components, reducing the table weight during component supply, and reducing the manufacturing cost. Especially. In order to achieve the above-mentioned object, an electronic component mounting apparatus according to the present invention is provided with a guide means for a component supply table arranged over a supply area and a replenishment area, and a guide means. A plurality of component supply tables, which are reciprocally movable by driving means along with, mount a plurality of storage units that store a large number of the same electronic components, and are individually movable independently of each other, and a substrate are mounted on the storage units. The substrate table movable by the driving means, the electronic component transfer device having the electronic component capturing means, and the component to be supplied on the component supply table in the supply area are at predetermined positions with respect to the transfer device. Component supply table control means for controlling the drive means so as to move and position the component supply table each time the type of component to be supplied changes.
Substrate table control means for controlling the driving means for positioning the substrate table, and transfer for controlling the transfer device for capturing the electronic component on the positioned component supply table and transferring the electronic component on the substrate A device control means is provided, and the position detection means in the component supply table control means is composed of high-resolution position detection means in the supply area and low-resolution position detection means in the replenishment area. Is. By carrying out the electronic component mounting work using the electronic component mounting apparatus according to the present invention, a plurality of component supply tables can be independently moved and positioned.
For example, one component supply table can be moved / positioned to a predetermined position facing the transfer device in the supply area, and another component supply table can be kept stationary during component supply by the component supply table. You can replenish or replace parts on the table,
As soon as the supply of the parts in the table during the parts supply is completed or there is a shortage of the parts, the parts can be immediately supplied to another parts supply table, so that the down time of the entire apparatus for replenishing the parts can be shortened or eliminated. Further, the components can be supplied to the transfer device by moving one or a plurality of the plurality of component supply tables at the same time and moving / positioning at a position facing the transfer device. According to the present invention, since a plurality of component supply tables are provided, the axial dimension can be reduced as compared with the conventional one, so that the weight of one table can be reduced and the tables can be moved one by one. In addition, the weight of the table during component supply can be significantly reduced compared to the conventional one having a large component supply table. Further, the structure of the position detecting means is simplified and the manufacturing cost of the component supply table control means is reduced. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings by taking an electronic component mounting apparatus as an example. FIG. 1 is a plan view of the component mounting apparatus, and FIG. 2 is FIG.
II-II line enlarged sectional view of FIG. The main body base 11 has a predetermined length along which the parts supply table 15 travels, and rail-shaped linear guides (guide means of the parts supply table) 12 are provided on both sides of the upper surface over the supply region L and the replenishment regions on both sides thereof. A groove 14 for mounting the linear motor 13 is formed in the central portion over substantially the entire length in the longitudinal direction of the main body base. Body base 1
A plurality of component storage units TR, for example, tape reel units, for sequentially sending out electronic components are installed on the component supply table 15 which travels on the upper part of the table 1. A large number of the same electronic components are stored in one storage unit TR, and generally different types of electronic components are stored for each storage unit. In the case of a component supply table that supplies about 100 types of electronic components, the number of storage units corresponding to the type must be mounted, and therefore the length of the component supply table requires several meters in total. In this embodiment, this component supply table is replaced by a plurality of component supply tables 15 (15a, 15b, 15c,
15d, 15e), the length of one component supply table can be reduced to a fraction. The component supply tables 15a to 15e have the same structure. As shown in FIG. 1, the component supply table 15b is in the supply region L and the supply tables 15c to 15e.
e is in the replenishment area on one side. That is, at least one component supply table 15 is provided in each of the supply area and the replenishment area. A plurality of storage units TR are arranged on the upper part of the component supply table 15 so that the storage units TR can be removably mounted in the traveling direction. Storage unit TR
Is a winding reel that winds a component tape in which electronic components are stored at regular intervals, a sprocket SP for taking out the electronic components stored in the component tape to a supply position F, and an upper tape UT of the component tape. Take reel W
It is composed of R and the like. A substrate table 4 is provided facing the linear guide 12 in the supply area, that is, below the transfer position B of the rotary head, and the table 4 is moved by an XY driving means (not shown). It is driven in the same manner as a conventionally known substrate table such as coordinates. Further, between the linear guide 12 and the substrate table 4, a rotary head type transfer device 3 in which a plurality of suction heads 3a are arranged in the circumferential direction is provided similarly to the conventional transfer device shown in FIG. There is. Each parts supply table 15
The traveling members 16 provided on both sides of the lower surface thereof are engaged with the linear guide 12 so that the component supply tables 15 can individually travel on the linear guide 12. The linear motor 13, which is a drive device of the table, forms a stationary portion by the magnets 17 arranged on both sides of the groove 14 of the main body base 11 so as to face each other, and the magnetic circuit (lines of magnetic force) 18 formed between the magnets 17. Has been done. The moving part of the linear motor 13 is the bobbin 1 around which the coil 19 'is wound.
9 is formed by projecting on the lower surface of the component supply table 15,
This bobbin 19 is inserted in the space between both magnets,
The coil 19 'is arranged so as to cut the magnetic field lines 18. Therefore, by energizing the coil 19 ',
The component supply table 15 is moved to the linear guide 12 by magnetic force.
You can drive over. Static part magnet 17
Is located throughout the stroke of the main body base 11,
The bobbin 19 of the movable part has a plurality of bobbins 19 linearly arranged on the component supply table 15, and the magnet 1 of the stationary part
7 are shared. Of the plurality of component supply tables 15, only the component supply table (component supply table 15b in FIG. 1) facing the transfer device 3 exemplified by the rotary head is repeatedly positioned with high accuracy. , Other parts supply tables (15a, 15c, 15d, 15
e) moves to the end side on the main body base and is stopped. As described above, it is only the range L portion 20 near the transfer device 3 that requires high-speed and high-accuracy positioning of the component supply table, and the length of the range L portion is about 1 m.
Since it is about the degree, the driving device can be simplified as shown in FIG. That is, since it is not necessary to perform high-speed and high-accuracy positioning in a region other than the L portion 20 and only transportation is required, the magnets 17b are intermittently arranged in that region, or a magnet having a coercive force lower than that of the L portion 20 region. May be placed. The driving of the region other than the L portion is a traveling in which inertial force is added. The table position detecting means for positioning the table is also provided with a high-resolution optical or magnetic linear scale 21 only in the area of the L portion 20, and the low-resolution position detection is provided in areas other than the area of the L portion 20. Means, that is, a plurality of proximity switches 22 are intermittently arranged or a low-resolution linear scale is arranged to detect the position of the component supply table 15. Reference numeral 23 is a linear scale head provided on the component supply table side, which is the main body base 11
Is arranged so as to face a linear scale provided on the side surface of the. A control device is required to individually move each of the tables 15 by a linear motor as a drive device to position the table 15 at a predetermined position facing the transfer device 3. An embodiment of this control device is shown in FIG. It will be explained based on 4. A plurality of parts supply tables 15a ... 15e
Each linear motor 13a, 13b, 13c, 13d, 1
3e, at least two sets of drivers 24 and a servo controller 25 are provided, a system controller 26 is provided above the servo controller 25, and a drive circuit 27 is provided between the driver 24 and the linear motors 13a ... 13e of each component supply table. A switch 29 for switching between the table position detecting circuit 28 and the table position detecting circuit 28 is provided. (1 in 2 sets in Fig. 4
A pair of symbols is shown with a dash. As a result, the drive circuit 27 causes the coils 19a ...
And the position detection circuit 28 uses the linear scale head 23 (2
3a, ..., 23e) are switched and connected. Next, the function of the above control device and the operation of each component supply table associated therewith will be described step by step with reference to FIGS. 5 (a), 5 (b), 5 (c) and 5 (d). FIG. 5 (a) shows the deviation of the servo controller 25 so that the linear motor 13c of the component supply table 15c on which the component instructed by the system controller 26 is placed is located directly below the transfer device 3 in the supply area. The driver 24 is driven until the amount becomes zero, and the drive circuit 27 and the position detection circuit 28 are connected to the coil and the linear scale head of the component supply table 15c by the switch 29, respectively. Therefore, since this state is highly accurate positioning, the position is detected by the linear scale 21. The component supply table 15c is moved to a position right below the transfer device 3 out of the plurality of types of storage units TR mounted on the component supply table 15c while being subjected to high-precision positioning, and the predetermined component thereof is moved. Is adsorbed by the adsorption head of the transfer device. After the attitude of the sucked predetermined type of electronic component is controlled, the substrate table 4 is moved in the XY directions so that it is transferred to a predetermined position of the printed circuit board on the substrate table 4 at a constant transfer position. Be moved to. When the transfer of the electronic component of the predetermined type is completed, the next storage unit is moved to the component supply table so as to be directly below the transfer device, and the electronic component is transferred in the same manner as described above. On the other hand,
Other parts supply tables 15a, 15b, 15d, 15e
The linear motors 13a, 13b, 13d, and 13e are moved to both ends of the main body base, are not connected to the drive circuit 27 and the position detection circuit 28, and the other driver 24 'is not used. When the electronic components are transferred as described above and the electronic components of the storage unit TR of a certain type on the component supply table 15c are exhausted or insufficient, the electronic components are next placed on the component supply table 15d. The system controller 26 issues a command to use the existing component. Then, as shown in FIG. 5B, the signal from the system controller 26 causes the linear motor 13c of the component supply table 15c, which has been performing the component transfer operation in the supply region until now, to move to the supplement region on the opposite side of the table 15d. After that, the driving circuit 27 'of the driver 24' of the switching device 29 is connected to the coil of the linear motor 13d after or simultaneously. Due to this connection, the linear motor 13d moves to a position facing the transfer device in the center of the device, but when the proximity switch 22 'closest to the linear scale 21 or a specific portion of the low resolution linear scale is passed, the command is issued to the system controller 26. As shown in FIG. 5 (c), the switch 29 connects the position detection circuit 28 'to the linear scale head 23d of the component supply table 15d. On the other hand, when the linear motor 13c of the component supply table 15c passes the proximity switch 22 'on the side opposite to the proximity switch 22', the position detection circuit 28 is disconnected from the linear scale head of the component supply table 15c. Then, when the vehicle comes to the predetermined place, the connection between the drive circuit 27 and the coil of the linear motor 13c is further disconnected. These disconnections are based on a command from the system controller 26. Then, as shown in FIG. 5 (d), the linear motor 13d of the component supply table 15d sequentially performs positioning travel according to the system controller 26, stops at a predetermined position, and transfers the component via the transfer device. Work is done.
This state is the same as that of the linear motor 13c in FIG. 5 (a), but the driver 24, the drive circuit 27, and the position detection circuit 28 are opened, and the circuits 27 and 28 are used for switching the operation of the next divided table. Is used. The switching operation is
By doing so, it is possible to drive and position with a smaller number of drivers and circuits than the number of linear motors. The system controller 26 is further connected to sub-controllers 41 and 42, and these sub-controllers are respectively connected to the transfer device 3 and the substrate table 4 (FIG. 4). The controller 41 controls ON / OFF of the connection between the trapping means of the transfer device 3, that is, the vacuum suction head 3a and the vacuum source, and also rotates and vertically moves the suction nozzle of the vacuum suction head 3a and rotates the rotary head 3. Then, the vacuum suction head 3a is controlled to move to the suction position A and the transfer position B. The sub-controller 42 is electrically connected to the substrate table 4, and more specifically to a driving means (not shown) thereof, and moves the substrate table 4 in XY direction,
A predetermined portion of the substrate on which the electronic component is to be transferred is positioned below the transfer position B of the transfer device 3. The above sub-controllers 41 and 42 are the same as the control means used for controlling the conventional transfer device 3 and substrate table 4 shown in FIG. Next, the operation of the apparatus of the above embodiment will be described by taking the parts supply table 15c as an example. The component supply table 15c is, as described above,
High-precision positioning control is performed within the component supply area L (Fig. 5a). More specifically, the parts supply table 1
The component supply table so that the electronic component supply unit F (FIG. 2a) of the predetermined type of tape reel unit in the plurality of types of tape reel units (storage units) TR above 5c is located directly below the suction position 3c. 15c is positioned with high precision. Similarly, the substrate table 4 is also positioned with high precision so that a predetermined transfer portion of the substrate on the substrate table 4 is positioned directly below the transfer position B. The transfer device 3 is controlled by the sub-controller 41, and the vacuum suction head 3a
At the capture position (suction position) A, sucks the electronic component stored in the tape reel unit TR, then controls the suction nozzle of the suction head 3a that has suctioned to rotate to a predetermined posture, and the suction head 3a moves. When the transfer position B is reached, the suction nozzle is lowered to transfer the sucked electronic component to the transfer site on the printed circuit board. In the same manner, the transfer of electronic parts is repeated. In FIG. 5, only one component supply table is positioned at high speed and high precision, and the switching operation is described, but it is also possible to simultaneously position two component supply tables by two drivers at high speed and high precision. . Since 20 to 30 types of small electronic components are placed on one component supply table and they are transferred onto the substrate at high speed, the electronic components of the storage unit which has been skipped one by one are transferred. Generally, it is preferable to perform control so that the electronic components of the adjacent storage units are sequentially transferred and not used. Of the plurality of component supply tables, the component supply table that has run out of electronic components is stopped at the end side of the main body base, and in this state, electronic components are replenished to the component supply table. Even during this replenishment time, electronic parts are transferred from the table located in the supply area to the printed circuit board through the transfer device, and the storage unit with the filled electronic parts is replenished to the part supply table during the transfer work. can do. As described above, according to the present embodiment, it is not necessary to stop the entire apparatus in order to replenish parts in the parts supply table, and the operation rate of the apparatus can be improved. Further, according to this embodiment, among the plurality of component supply tables, only the component supply table which is carrying out the electronic component transfer operation via the transfer device is positioned and moved at high speed, and the replenishment area Since the other component supply tables in the table are stationary, the weight of the table during component supply can be reduced to, for example, a fraction of the conventional one, depending on the number of component supply tables. The force, vibration, and noise are reduced, and the reliability of performance and strength is improved.
As a result, the capacity of the motor and controller can be small and economical even when a supply table that handles a wide variety of parts is driven at high speed. Further, since the weight of each divided table is lightened, the table can be moved at a high speed, and the responsiveness of moving / stopping is improved, so that the work efficiency can be improved. If there are few kinds of parts to be mounted, if parts of the same kind are placed on each division table, if there are no more parts in the table during supply of parts, it can be replaced with another division table to continue. When parts can be supplied and there are many kinds of parts, different kinds of parts can be placed on the parts supply table, and different tables can be sequentially moved to the parts supply position for use, or multiple tables can be used. It is also possible to connect them and use them as one long table. In the above-mentioned embodiment, the case where the linear motor is used as the drive device for the component supply table has been described as an example, but it goes without saying that another drive means may be used as long as it can drive the table. It goes without saying that a driving method using a rack, a pinion, a speed reducer and a motor or a driving method in which a ball screw is driven by a DC motor or a stepping motor may be used, as described in the section "." According to the component mounting apparatus of the present invention, the component supply table is composed of a plurality of tables, and the components are replenished on the base of the main body except for the component supply table in the supply region during component supply. Since it is possible to make it stand still in the area and replenish the storage unit filled with electronic parts and put it in a standby state, when there are no or insufficient electronic parts in the parts supply table, another electronic parts replenished By exchanging with the component supply table, the supply of electronic components or the mounting of electronic components can be continued only by taking an extremely short down time for table exchange. Further, in parallel with the transfer of the electronic component, the storage unit that is filled with the electronic component can be replenished in the component supply table in the replenishment area. Therefore, the downtime of the transfer work due to the component replenishment or the component replacement can be made very short, and the work efficiency of the electronic component mounting work can be greatly improved. The replenishment of the storage unit can be performed while the component supply table is stationary, and can be performed safely and reliably. In addition, each component supply table is significantly smaller and lighter than the conventional single component supply table, so vibration during movement can be reduced and the drive speed of the component supply table can be increased. Therefore, it is possible to easily increase the speed. Further, since the position detecting means in the component supply table control means is the high-resolution position detecting means only in the supply area and the anti-resolution position detecting means in the replenishment area, the structure of the position detecting means and thus the component supply table control means is simplified. And the manufacturing cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a component mounting apparatus showing an embodiment of the present invention. FIG. 2 (a) is a side view showing an upper structure of a component supply table, and (b) is FIG. II-II line enlarged cross-sectional view taken along the line II-II of FIG. 3 is a detailed plan view of the component supply table shown in FIG. 1. FIG. 4 is a configuration diagram showing an example of a control device according to an embodiment of the present invention. Shows the operating status of the control device shown in (a),
(b), (c), and (d) are explanatory views of the operation according to the operation order, respectively. [FIG. 6] A plan view showing a conventional component mounting apparatus [FIG. 7] An enlarged cross section taken along the line VII-VII in FIG. It is a figure. [Explanation of Codes] 3 ... Transfer Device 4 ... Substrate Table TR ... Storage Unit 11 ... Main Body Base 13a, 13b, 13c, 13d, 13e ... Linear Motor (Drive Device) 15, 15a, 15b, 15c, 15d, 15e ... Parts supply table 17, 17b ... Magnet 19 ... Bobbin 19 '... Coil 21 ... Linear scale (position detection means) 22 ... Proximity switch (position detection means) 23 ... Linear scale head 24 ... Driver 25 ... Servo controller 26 ... System controller 27 ... Drive circuit 28 ... Table position detection circuit 29 ... Switching device

   ────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshio Kanda               390 Muramatsu, Shimizu City Hitachi, Ltd.               Machinery Research Institute (72) Inventor Takashi Kawakami               390 Muramatsu, Shimizu City Hitachi, Ltd.               Tokoro Shimizu factory

Claims (1)

(57) [Claims] [1] A guide means for a parts supply table disposed over the supply area and the replenishment area, and a reciprocating drive means along the guide means for the same electronic part. Multiple component storage tables that store multiple types of storage units that can be moved independently of each other, a substrate table that is mounted with substrates and can be moved by drive means, and capture of electronic components And an electronic component transfer device having means for supplying the component supply table so that the component to be supplied on the component supply table in the supply area is positioned at a predetermined position with respect to the transfer device. Each time the type changes, it is moved and positioned, and at the same time, the component supply table control means that controls the drive means for positioning in the replenishment area, and the drive hand that positions the substrate table A substrate table control means for controlling the step, and a transfer device control means for capturing the electronic component on the positioned component supply table and controlling the transfer device to transfer the electronic component onto the substrate, and The electronic component mounting apparatus is characterized in that the position detection means in the component supply table control means is composed of a high resolution position detection means in the supply area and a low resolution position detection means in the replenishment area.