JP4224742B2 - Component mounting head and component mounting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a component mounting head for adsorbing a component such as an electronic component to a detachable nozzle and rotating it to correct the position of the adsorbed component and mounting it on a substrate such as a printed wiring board, and a component mounting apparatus including the component mounting head It is about.
[0002]
[Prior art]
In a mounting line in which electronic components are mounted on a printed wiring board and a circuit connection is made with solder or the like, a cream solder printer, a component mounting apparatus, a reflow furnace, and other facilities are connected by a conveyor. In such a configuration, the printed wiring board is automatically flowed to each device by the conveyor and processed.
[0003]
That is, the cream solder printer applies cream solder to a predetermined position on the printed wiring board that has been transported on the conveyor. The component mounting apparatus mounts a predetermined electronic component at a predetermined position on a printed wiring board that has been transported on a conveyor after solder application. The reflow furnace melts and solidifies the cream solder on the printed wiring board that has been transported on the conveyor after the components are mounted, and connects the circuits.
[0004]
Examples of electronic components mounted on the printed wiring board include ICs, resistors, and connectors. The component mounting apparatus includes a component mounting head for taking out these electronic components from the component supply unit and moving them to the printed wiring board for mounting.
FIG. 3 is a schematic perspective view showing an example of a conventional component mounting head.
The component mounting head 10 includes a suction nozzle 11, a spline shaft 12, pulleys 13 and 14, a motor 15, and a belt 16.
[0005]
The suction nozzle 11 is connected to a vacuum pump (not shown). The spline shaft 12 has a suction nozzle 11 detachably attached to one end. The pulley 13 is fitted into the other end of the spline shaft 12. The pulley 14 is fitted on the shaft of the motor 15. And the belt 16 is spanned between the pulleys 13 and 14 (refer Unexamined-Japanese-Patent No. 2-69998, Unexamined-Japanese-Patent No. 3-131100).
[0006]
An operation example of such a configuration will be described.
First, the component mounting head 10 is moved to the component supply unit, and the electronic component is vacuum-sucked at the tip of the suction nozzle 11 and taken out from the component supply unit. Next, the taken-out electronic component is recognized by a camera (not shown), and a positional deviation from a predetermined position is measured.
[0007]
Then, the motor 15 is driven by an amount corresponding to this positional deviation, and the spline shaft 12 and the suction nozzle 11 are rotated via the pulleys 13 and 14 and the belt 16. Thereby, the electronic component vacuum-sucked at the tip of the suction nozzle 11 can be positioned at a predetermined position. Thereafter, the positioned electronic component is mounted at a predetermined position on the printed wiring board.
[0008]
[Problems to be solved by the invention]
In the conventional component mounting head 10 described above, the position of the electronic component is corrected by a belt drive. However, it is difficult to generate an error due to the deformation of the belt 16 or to increase the reduction ratio. There is a problem that position correction is difficult.
[0009]
For this reason, a component mounting head for correcting the position of an electronic component by direct drive has been developed, and the above problem can be solved. However, if the motor encoder is reduced in size, the resolution is also reduced, and the resolution required for the component mounting apparatus cannot be obtained, which makes it difficult to reduce the size of the component mounting head.
[0010]
In view of this, a component mounting head having a configuration in which a reduction gear directly connected to a coarse adjustment motor and a fine adjustment motor connected to a nozzle shaft are connected via a flange has been proposed. (See JP-A-5-335797). However, since they are simply connected via a flange, it is difficult to adjust the coaxiality between the output shaft of the reduction gear and the nozzle shaft, and it is difficult to highly accurately correct the position of the electronic component.
[0011]
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a component mounting head and a component mounting device capable of performing component position correction with high accuracy with a simple structure.
[0012]
[Means for Solving the Problems]
According to the present invention, in the present invention, a component mounting head that sucks a component onto a detachable nozzle and rotates the sucked component to correct the position and mounts the component on a substrate is directly connected to the motor. A reduction gear, a shaft to which the nozzle is attached and detached, a support means for supporting the motor and the reduction gear and the shaft, a rigid coupling for connecting and fixing the output shaft of the reduction gear and the shaft, A ball bearing for supporting the output shaft of the speed reducer, and a sliding bearing attached to the supporting means for supporting the shaft, the two sliding bearings being disposed with a predetermined gap therebetween, This is achieved by performing air suction when sucking parts through the gap .
[0013]
Further, in the present invention, in the component mounting apparatus provided with the component mounting head for sucking a component to a detachable nozzle and rotating the sucked component to correct the position and mounting the substrate on the substrate. The component mounting head includes a motor, a speed reducer directly coupled to the motor, a shaft to which the nozzle is attached and detached, a support means for supporting the motor, the speed reducer, and the shaft, and an output shaft of the speed reducer. And a rigid coupling that connects and fixes the shaft, a ball bearing that supports the output shaft of the speed reducer, and a sliding bearing that is attached to the support means and supports the shaft. The two air gaps are arranged with a gap between them, and air suction when sucking the parts is performed through the gaps .
[0014]
According to the above configuration, since the motor, the speed reducer, the shaft, and the nozzle are simply configured to be connected via the connecting means, the number of elements causing rattling is reduced, and the speed reducer is provided. The resolution is reduced, and highly accurate position correction can be performed. Furthermore, the number of parts is reduced, and the size and weight can be reduced and the cost can be reduced.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms.
[0016]
FIG. 1 is a schematic perspective view showing an embodiment of a component mounting apparatus including an embodiment of a component mounting head of the present invention.
On the main body 101 of the component mounting apparatus 100, a conveyor 102 for conveying the printed wiring board (board) 5 is disposed. On both sides of the conveyor 102 on the main body 101, a component supply cassette 103 for mainly supplying small electronic components and a component supply tray unit 104 for mainly supplying large electronic components are disposed. Yes.
[0017]
Above the main body 101, a component mounting head 110 for mounting an electronic component on the printed wiring board 5, a camera 105 for recognizing an image of the electronic component taken out by the component mounting head 110, a component mounting head 110, and a camera An XY robot 106 for moving 105 in the XY direction is provided. On the main body 101 side, a management / operation monitor 107 for inputting an operation program for controlling the component mounting apparatus 100 is disposed. Inside the main body 101, a management / operation monitor 107 is provided. A control unit 108 for controlling the component mounting apparatus 100 by executing an input operation program or the like is provided.
[0018]
2A and 2B are a side view and a partial cross-sectional side view showing details of the component mounting head 110 shown in FIG.
The component mounting head 110 includes a suction nozzle 111, a shaft 112, a connecting means 120, a speed reducer 113, a motor 114, an encoder 115, and the like.
The suction nozzle 111 is detachably attached to the tip of the shaft 112. The suction nozzle 111 is provided with a through hole 111a that extends from the front end to the rear end.
[0019]
The shaft 112 is connected to the output shaft 113 a of the speed reducer 113 by the connecting means 120. The shaft 112 is formed to have the same diameter as the output shaft 113a of the speed reducer 113, and is provided with a through hole 112a that extends from the tip to the side surface of the central portion.
The speed reducer 113 is directly connected to the motor 114. An encoder 115 is attached to the motor 114. Thereby, the position detection resolution of the encoder 115 on the output shaft 113a of the speed reducer 113 can be reduced by the speed reduction ratio of the speed reducer 113.
[0020]
The connecting means 120 includes a motor base (support means) 121, a rigid coupling 122, a sliding bearing 123, and a ball bearing 124.
The motor base 121 is formed in a shape in which side walls 121a and 121b are erected on both ends of a flat plate. One side wall (upper side wall) 121 a supports the speed reducer 114 and the motor 115 and encoder 116 connected thereto, and the other side wall (lower side wall) 121 b supports the shaft 112.
[0021]
The upper side wall 121a is provided with a hole 121c through which the output shaft 113a of the speed reducer 113 passes. The lower wall 121b is provided with a hole 121d that is coaxial with the hole 121c provided in the upper wall 121a and through which the shaft 112 passes. Each hole 121c, 121d is formed by simultaneous processing in order to increase the coaxiality.
[0022]
Further, when the speed reducer 113 is attached to the upper side wall 121a and the speed reducer 113 with the speed reducer mounting screw 121e, the output shaft 113a and the shaft 112 of the speed reducer 113 penetrated through the holes 121c and 121d. Are provided with speed reducer mounting screw holes 121f and 113b. The lower side wall 121b is provided with a through hole 121g that leads from the side surface to the hole 121d, and an air coupling 116 is provided in the through hole 121g.
[0023]
The rigid coupling 122 is formed in a cylindrical shape. The shaft 112 and the output shaft 113a of the speed reducer 113 are fitted from both ends of the rigid coupling 122, respectively. The shaft 112 and the output shaft 113 a of the speed reducer 113 are fixed by a shaft mounting screw 122 a and an output shaft mounting screw 122 b that are mounted on the side surface of the rigid coupling 122.
[0024]
Thereby, the eccentricity of the shaft 112 and the output shaft 113a of the speed reducer 113 can be reduced. By using an Oldham type joint instead of the rigid coupling 122, the eccentricity of the shaft 112 and the output shaft 113a of the speed reducer 113 can be absorbed.
[0025]
The sliding bearing 123 is made of resin and is formed in a cylindrical shape having a flange portion 123a and a boss portion 123b. Boss portions 123b of the two sliding bearings 123 are fitted from both ends of a hole 121d provided in the lower wall 121b of the motor base 121, respectively. The shaft 112 is fitted so as to penetrate the inner diameter portion of each sliding bearing 123.
[0026]
At this time, the boss portion 123b of each sliding bearing 123 is fitted with a gap, and is provided on the lower side wall 121b of the motor base 121 by the end surface of each boss portion 123b, the inner wall of the hole 121d, and the outer peripheral surface of the shaft 112. A cylindrical space 121h is formed to connect the through hole 121g that is formed and the through hole 112a provided in the shaft 112.
[0027]
As a result, the through-hole 111a of the suction nozzle 111, the through-hole 112a of the shaft 112, and the through-hole 121g of the lower side wall 121b are connected to each other. It becomes possible to adsorb. Further, since the space portion 121h is cylindrical, the through hole 112a is always located in the space portion 121h even when the shaft 112 rotates, and air suction is not hindered.
[0028]
Since the sliding bearing 123 having such a support function for supporting the shaft 112 and a packing function for preventing air leakage is used as a separate part, it is not necessary to perform complicated groove processing or the like on the motor base 121, thereby reducing the size. It becomes easy. Further, since the resin-made sliding bearing 123 is slightly deformed, even if the shaft 112 and the output shaft 113a of the speed reducer 113 are eccentric, the eccentricity can be absorbed.
[0029]
In addition, the packing function can be further enhanced by forming the sliding bearing 123 from rubber or the like, and the durability can be improved by forming it from a metal or the like. Further, by using a ball bearing instead of the sliding bearing 123, the support function can be further enhanced.
The ball bearing 124 is disposed in the speed reducer 113 so as to support the output shaft 113 a of the speed reducer 113.
[0030]
In such a configuration, an example of the operation will be described with reference to FIGS.
First, the printed wiring board 5 is carried from the board carry-in port 102a of the conveyor 102 and positioned at the mounting position 102b. Next, the XY robot 106 moves the component mounting head 110 to the component supply unit of the component supply cassette 103 or the component supply tray unit 104. Then, the component mounting head 110 is lowered in the Z direction, and the electronic component is vacuum-sucked at the tip of the suction nozzle 111 and taken out from the component supply unit.
[0031]
Thereafter, the component mounting head 110 is raised in the Z direction, and the component mounting head 110 is moved to a predetermined position on the printed wiring board 5 by the XY robot 106. During this time, the taken-out electronic component is recognized by the camera, and the positional deviation from the predetermined position is measured. Then, the motor 114 is driven by an amount corresponding to this positional deviation, and the suction nozzle 111 is rotated via the speed reducer 113, the rigid coupling 122 and the shaft 112. Thereby, the electronic component vacuum-sucked at the tip of the suction nozzle 111 can be positioned at a predetermined position.
[0032]
Then, the component mounting head 110 is lowered in the Z direction to mount the electronic component at a predetermined position on the printed wiring board 5, and then the electronic component is released from the tip of the suction nozzle 111. Thereafter, the mounting of the next electronic component is controlled by the same operation. Then, the printed wiring board 5 on which all the electronic components have been mounted is unloaded from the substrate unloading port 102c of the conveyor 102, and is conveyed to the next step.
[0033]
In the above-described embodiment, the component mounting apparatus 100 including one component mounting head 110 has been described. However, a component mounting apparatus in which a plurality of component mounting heads 110 are installed in parallel or annularly may be used. Further, the encoder 115 may be disposed on the output side of the speed reducer 113 instead of being disposed on the motor 114 side to perform full-closed control. Further, power transmission from the motor 114 to the speed reducer 113 may be performed by a belt, and the speed reducer 113 and the suction nozzle 111 may be directly connected.
[0034]
【The invention's effect】
As described above, according to the present invention, it is possible to accurately correct the position of a component with a simple structure.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an embodiment of a component mounting apparatus including an embodiment of a component mounting head of the present invention.
FIG. 2 is a side view and a partial cross-sectional side view showing details of the component mounting head 110 shown in FIG. 1;
FIG. 3 is a schematic perspective view showing an example of a conventional component mounting head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 5 ... Print wiring board, 100 ... Component mounting apparatus, 101 ... Main body, 102 ... Conveyor, 103 ... Component supply cassette, 104 ... Component supply tray unit, 105 ... Camera 106 106 XY Robot 107 Management monitor 108 Control unit 110 Component mounting head 111 Suction nozzle 111 a Through hole 112 ... shaft, 112a ... through hole, 113 ... reducer, 113a ... output shaft, 113b ... reducer mounting screw hole, 114 ... motor, 115 ... encoder, 116 ..Air coupling, 120... Connection means, 121... Motor base (support means), 121 a... Upper wall, 121 b .. lower wall, 121 c, 121 d. Reduction gear mounting screw, 121f ... Reduction gear mounting screw hole, 121g ... Through hole, 121h ... Space, 122 ... Rigid coupling, 122a ... Shaft mounting screw, 122b ... Output Shaft mounting screw, 123 ... sliding bearing, 123a ... flange, 123b ... boss, 124 ... ball bearing

Claims (2)

In a component mounting head that sucks a component to a detachable nozzle and rotates it to correct the position of the sucked component and mounts it on the board.
A motor,
A speed reducer directly connected to the motor;
A shaft to which the nozzle is attached and detached;
Support means for supporting said shaft and said motor and said reduction gear,
A rigid coupling for connecting and fixing the output shaft of the speed reducer and the shaft;
A ball bearing that supports the output shaft of the speed reducer;
A sliding bearing attached to the support means and supporting the shaft ;
Two of the sliding bearings are arranged with a predetermined gap therebetween, and the component mounting head is configured to perform air suction when sucking the component through the gap . In a component mounting apparatus equipped with a component mounting head that sucks a component into a detachable nozzle and rotates the mounted component to correct the position and mounts it on a substrate.
The component mounting head is
A motor,
A speed reducer directly connected to the motor;
A shaft to which the nozzle is attached and detached;
Support means for supporting said shaft and said motor and said reduction gear,
A rigid coupling for connecting and fixing the output shaft of the speed reducer and the shaft;
A ball bearing that supports the output shaft of the speed reducer;
Mounted on said support means, and a slide bearing for supporting said shaft, said sliding bearing is two arranged with a predetermined gap therebetween, said gap the air suction at the time of adsorbing the component A component mounting apparatus characterized by being performed via

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