JP2686202B2 - Component mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component mounting apparatus for rotating a component by a predetermined angle .theta. And mounting it on a substrate with a desired pressure.

[0002]

2. Description of the Related Art Many proposals have already been made for a component mounting apparatus which rotates an attracted and held component by a predetermined angle .theta. When mounting an electronic component on a substrate. The apparatus described in Japanese Patent Laid-Open No. 62-250696 also shows an example thereof. In this device, a rotary head unit is connected coaxially with a rotary shaft of a rotary drive unit, and a suction nozzle elastically supported on the lower surface of the rotary head unit is rotated by a predetermined angle. Also, many proposals have been made for a component mounting apparatus that applies an appropriate pressure according to the type of the component when mounting the electronic component on the substrate. One example is a Japanese Patent Laid-Open No. 1-246899. There is a bulletin. In this device, the suction nozzle of the upper and lower shafts,
Further, the air is driven in the mounting direction, and the air pressure is controlled by the electropneumatic regulator.

[0003]

In the component mounting apparatus, it is desirable to mount the component at a specified position on the substrate with high accuracy and with a pressing force according to the strength of the component. The above-mentioned conventional example solves these problems individually. The present invention attempts to solve these problems at the same time, and further addresses the following problem in the latter conventional example. Since a vacuum suction path for picking up a component is provided in the moving axis direction of the suction nozzle that moves up and down, it sucks up the component and the suction nozzle itself, and lowers the suction nozzle with an air pressure that opposes this. The point is that it is necessary. That is, it is also an attempt to solve the problem that the pressure applied to the suction nozzle becomes unstable depending on the vacuum suction state of the component.

[0004]

According to the present invention, a cylindrical housing having a through hole in the axial center of the upper end is rotated in a spindle housing which is moved up and down relatively by a lifting device with respect to a substrate on which components are mounted. A rod which is vertically supported as much as possible and which is supported so as to be able to move up and down in the spindle and whose lower portion is pulled out from the lower portion of the spindle is urged by a spring toward a lowering stopper in the spindle. Further, suction holes are provided on the lower surface of the rod, and an intake passage is provided inside for communicating the suction holes with the inside of the spindle. Then, the cylinder bush is inserted into the through hole of the spindle, and the lower end of the piston that reciprocates inside this is brought into contact with the upper part of the rod either directly or via a compression coil spring. A hollow rotary shaft of a motor is connected to an upper part of the spindle, and compressed air is supplied to the inside of the cylinder bush through the hollow rotary shaft to provide air pressure adjusting means for operating the piston. Further, the spindle housing, the exhaust hole of the spindle, the inside of the spindle, and the intake passage of the rod are connected to a vacuum source to control the operations of the lifting device and the air pressure adjusting means.

[0005]

[Operation] The air is sucked from the side surface of the rod to generate a vacuum suction force in the rod, the parts are vacuum-sucked to the lower end of the rod having the suction hole, and the predetermined rotation amount of the motor is directly transmitted to the rod,
And apply a desired pressure from the axial direction to the upper end surface of the rod,
Mount on the board.

[0006]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an essential part of a component mounting apparatus according to an embodiment, where A is an electronic component, B is a substrate on which the electronic component A is mounted, and 1 is a component mounting head. The component mounting head 1 is supported by the arm 2 and moves three-dimensionally relative to the substrate B, but its mechanism is not the gist of the present invention, and therefore its explanation is omitted. 3 is a component mounting head 1 via an arm 2.
Is an elevating device for elevating.

The component mounting head 1 includes a spindle housing 11, a spindle 12, a rod 13, a piston 14,
It is composed of a spring 15, a motor 16, and the like. The spindle housing 11 is vertically supported by the arm 2, vertically supports the spindle 12 rotatably, and has an exhaust hole 111 on a side surface. The spindle 12 has a through hole 1 at the axial center of the upper end.
22, a cylinder shape having an exhaust hole 123 on a side surface, and a lower part thereof projects from a lower surface of the spindle housing 11. The holder 112 rotatably supports the spindle 12 and is provided with a cutout groove on the inner peripheral surface at a position corresponding to the exhaust hole 123.
At a position corresponding to 1, there is a through hole drilled in the centripetal direction so as to communicate with the cutout groove. Sealing means (not shown) is attached to the upper and lower circumferential portions of the cutout groove, and when the vacuum source 6 is connected to the exhaust hole 111 and vacuum suction is performed, even if the spindle 12 is rotating, the inside of the spindle is rotated. Vacuum suction is possible.

The rod 13 is installed inside the spindle 12,
It is vertically movable and non-rotatably installed concentrically with the axial center, the lower end projects from the lower surface of the spindle 12, and the component suction nozzle C is attached. The component suction nozzle C can be replaced, but its method will not be described here. The upper circumferential portion has a flange portion that receives a compression coil spring 142 described later. At the center of the rod 13, an intake passage 13 communicating with the component suction nozzle C is provided.
1 is provided. The intake passage 131 communicates with the inside of the spindle 12 through a side opening 132 at the top of the rod.

The piston 14 has a through hole 12 in the spindle.
2 has a flange portion that is reciprocally fitted in a cylinder bush 141 that is vertically inserted and fixed in 2 and that presses the compression coil spring 142 on the circumference of its lower end portion.
The compression coil spring 142 has an upper part fitted into the flange part of the piston 14 and a lower part fitted into the upper end flange part of the rod 13, and serves to transmit the reciprocating motion of the piston 14 to the rod 13.

The spring 15 is inserted between the spindle 12 and the rod 13 as shown in FIG. 2 showing the lower part of the spindle in detail, and the rod 13 is lowered in the descending direction toward the descending stopper portion 121 provided at the lower end of the spindle 12. Push down. The spring pressure of the spring 15 is set to a value smaller than the applied pressure of the component for which the mounting pressure must be minimized in the component group to be mounted.

The motor 16 is attached to the upper part of the spindle housing 11 so that its own rotation shaft 161 is concentric with the rotation shaft of the spindle 12. The rotary shaft 161 is hollow, and the lower part thereof is connected to the spindle 12 by a coupling 163. A rotary joint 164 for air piping is attached to the upper end of the rotary shaft 161, and the air pressure source 5 is connected to the rotary joint 164 via the air pressure adjusting means 4.
The rotary joint 164 supplies compressed air from the inside of the rotary shaft 161 to the inside of the cylinder bush 141 without disturbing the rotation of the rotary shaft 161, and drives the piston 14. Therefore, highly viscous grease is applied between the piston and the inner wall of the cylinder bush so that the compressed air supplied to the upper portion of the piston does not leak into the spindle.

The air pressure adjusting means 4 sets the air pressure according to a designated voltage or current value, like an electropneumatic conversion regulator, and is connected to the controller 7. When the component mounting head 1 is at the component supply position, the control unit 7 controls the elevating device 3 and the vacuum source 6 to lower the component mounting head 1 to suck the component A on the lower end of the suction nozzle C. When the component mounting head 1 holds the component by suction and is in the component mounting position on the board, the motor 16,
By controlling the elevating device 3, the air pressure adjusting means 4, and the vacuum source 6, the component is lowered while being horizontally rotated by a designated angle, and the component A is mounted on the substrate B with a pressing force specified for each component.

The operation of this embodiment having the above configuration will be described. When the component mounting head 1 suction-holds the component A and reaches the component mounting position on the substrate, the control unit 7 controls the motor 1 based on the preset numerical data.
6 and the lifting device 3 are controlled to rotate the spindle 12 by a specified angle, and the suction nozzle C is lowered onto the substrate with a stroke slightly larger than the value obtained by subtracting the thickness of the component A. When the component A reaches the board, the rod 13 moves the lower stopper 12 of the spindle 12 by an extra stroke.
Moving upwards from 1, compresses the spring 15. In this state, the control unit 7 instructs the air pressure adjusting means 4 to set a voltage value relating to the pressure level applied to the preset component A.

The air pressure adjusting means 4 regulates the compressed air from the air pressure source to the air pressure corresponding to the voltage value received from the control section 7 and supplies it to the rotary joint 164. The compressed air adjusted to the specified pressure passes from the rotary joint 164 through the rotary shaft 161 of the motor,
It flows into the cylinder bushing 141 and pushes the piston 14 downward. Then, the compression coil spring 142 is compressed, and the repulsive force presses the upper portion of the rod 13 to try to move it downward, and a specified pressure is applied to the upper surface of the component A. That is, on the upper surface of the part A, the rod 1
3, the self-weight of the suction nozzle C, the spring pressure of the spring 15, and the specified air pressure are applied. In the present embodiment, the compression coil spring 142 is interposed so that the piston does not directly hit the rod and impact the parts. However, when the pressing force at the piston start does not adversely affect the parts. In this case, the structure without this may be used.

The suction of the component A passes through the suction nozzle C, the suction passage 131 of the rod 13, the side opening 132 of the rod, and the inner surface of the spindle 12.
Through the notch groove and the through hole of 2, the spindle housing 1
The vacuum source 6 is reached from the first exhaust hole 111.
Therefore, the vacuum suction force of the component A does not act directly in the moving axis direction of the rod 13, but only affects the slide resistance between the rod 13 and the inner surface of the spindle 12 from the side surface. Therefore, the command voltage value to be input to the air pressure adjusting means 4 which is input to the control unit 7 in advance is the rod 1 due to the component adsorption.
It is a value considering the effect of 3 on the slide resistance.

[0016]

According to the present invention, air is sucked from the side surface of the rod to generate a vacuum suction force in the rod, the component is vacuum-sucked to the lower end of the rod having the suction hole, and a desired pressure is applied to the upper end surface of the rod in the axial direction. In addition, it is possible to mount on the substrate, and it is possible to perform accurate mounting and pressurization for each component, regardless of the vacuum suction state of the component. Further, since a predetermined amount of rotation of the motor is directly transmitted to the spindle and the rotary shaft of the motor itself is used as a passage for pneumatic pressure application, it is effective in miniaturizing the component mounting head.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a component mounting apparatus of the present invention.

FIG. 2 is a sectional view of the component mounting apparatus, showing a part of FIG. 1 in detail.

[Explanation of symbols]

 A component B substrate C suction nozzle 1 component mounting head 11 spindle housing 12 spindle 13 rod 14 piston 141 cylinder bush 142 compression coil spring 15 spring 16 motor 3 lifting device 4 air pressure adjusting means 6 vacuum source 7 controller

Claims (2)

(57) [Claims] 1. A component mounting apparatus having the following configuration. a. Spindle housing with exhaust holes on the side. b. An elevating device for elevating and lowering the spindle housing relative to a board on which components are mounted. c. Vertically supported rotatably on the spindle housing,
A cylindrical spindle that has a through hole in the axial center of the upper end and an exhaust hole on the side surface. d. A cylinder bush vertically inserted into the through hole of the spindle. e. The spindle is supported in the spindle so as to be concentric with the axial center and movable up and down, the upper end faces the lower surface of the cylinder bush, and the other extends downward through the lower part of the spindle.
A rod having an intake passage that communicates with the inside of the spindle from an adsorption hole provided at its lower end. f. A piston which reciprocates in the cylinder bush so that its lower end contacts the upper end surface of the rod and presses the rod at an appropriate time. g. A spring for urging the rod in the descending direction toward the descending stopper in the spindle. h. A motor having a rotating shaft connected to an upper portion of the spindle and having a through hole communicating with the cylinder bush in an axial direction of the rotating shaft. i. Air pressure adjusting means for adjusting the air pressure supplied to the through hole of the rotation shaft of the motor and pressing the rod with the piston. j. A vacuum source for adsorbing components through the exhaust hole of the spindle housing, the inside of the spindle, and the intake passage of the rod. k. A control unit that controls the operations of the air pressure adjusting means and the lifting device so that the components are mounted at a specified pressure when the components are mounted. 2. The component mounting apparatus according to claim 1, further comprising the following configuration. A compression coil spring that is located between the upper part of the rod and the lower part of the piston and transmits the pressing force of the piston to the rod without abutting them.