JPS6163097A - Valve switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a valve switching device generally used in devices for mounting minute electronic components onto electronic circuit boards and other devices for transporting components using moving suction nozzles. be.

Conventional configurations and their problems Traditionally, when attaching leadless microelectronic components such as chip resistors and chip multilayer capacitors to electronic circuit boards, adhesive was applied to the necessary locations on the circuit board. A method is adopted in which the electronic components are first placed on the circuit board and then sequentially supplied and bonded to the circuit board. The circuit board to which the electronic components are bonded is electrically connected by solder dip.

The device for mounting electronic components is equipped with a rotating index type component mounting head that is equipped with a number of suction nozzles.These suction nozzles sequentially pick up electronic components at a component receiving position, transport them to a component mounting position, and then mount them on a circuit board. It is suggested that something be done.

For switching between positive and negative pressure of the suction nozzle of such a device,
In other general devices, there is a need for a valve switching device that is mounted on a rotating frame or the like that rotates intermittently, can switch valves regardless of whether the device is rotating or not, and has a simple structure.

For example, some conventional valve switching devices used for such applications switch the valve by means provided at the stop position or in the middle of the rotation path, but it is necessary to ensure that the switching state is maintained. Therefore, it is necessary to use a valve equipped with a clamping device. However, when a clamp device is provided, there are problems in that the structure becomes complicated and the life span is shortened.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a valve switching device that allows switching operations regardless of whether the switching valve is being transferred or stopped, and that has a simple structure.

Structure of the Invention The valve switching device of the present invention is a switching valve that has a rotatable operating lever and its return spring, and can selectively open and close an internal positive pressure path and a negative pressure path by rotating the operating lever. a transfer device that intermittently transfers the switching valve along a certain path; a fixed cam that is provided along the certain path and rotates the operating lever; and a fixed cam that is provided at a stop position of the transfer path. and a push member that moves forward and backward to rotate the switching valve.

According to this configuration, switching can be performed by the fixed cam while the switching valve is moving, and switching can be performed by the push member while the switching valve is stopped. Furthermore, since switching is performed by a fixed cam during movement, there is no need for a clamp device on the switching knob 1 to maintain the switching state, resulting in a simple structure.

DESCRIPTION OF THE EMBODIMENTS An embodiment in which the present invention is applied to an electronic component mounting apparatus is shown in FIGS. 1 to 13. In Figures 1 to 3, reference numeral 1 denotes a base, and an XY table 4 on which two circuit boards 2 and 2' are placed side by side on the left and right sides of the figure is installed at the front, and on the circuit board 2' on the right side. An adhesive applicator 5 that applies adhesive to the circuit board 2 and a component mounting head 6 that mounts the electronic component 8 onto the left circuit board 2 are installed in parallel. The left circuit board 2 has been shifted from the right side on the XY table 4 after the adhesive has been applied. To component mounting: A component supply rotor 7 is installed behind the throat 6.

The component mounting head 6 has a chuck 9 that holds the electronic component 8.
are equally spaced in the circumferential direction, and are intermittently rotated around the vertical axis by pinching the chuck 9.

The head frame 29 of the base 1 is provided with an upper drive section 50 for driving various parts and a head drive cam unit 51.

The XY table 4 has left and right (X-axis direction) and front and rear (Y-axis direction)
A Y table 4a (
(Fig. 4) and the horizontal guide rail 1 on this Y-table 4a.
6 (FIG. 1) and an X table 4b that moves in the lateral direction (X-axis direction). Y table 4a and X
The table 4b is driven by pulse motors 17 and 1, respectively.
8 and a feed screw mechanism (not shown).

On both sides of the XY table 4, a carry-in guide rail 19 and a carry-out guide rail 20 for the circuit board 2.2' are installed.

The component supply rotor 7 is rotatably provided around a vertical axis 21, and has a large number of component supply cassettes 22 removably attached to its outer periphery. The parts supply cassette 22 is
Component holding tape 23 (sixth tape) holding electronic components 8 in one row
) is wound on a reel and stored, and the take-out section 2
2a, the component holding tape 23 is intermittently fed out at each component arrangement pitch. Each parts supply case/
The throat 22 is provided with electronic components 8 of different types stored therein.

Each chuck 9 of the component mounting head 6 is, as shown in FIG.
It consists of a suction nozzle 13 and a pair of regulating claws 14. The regulating claw 14 serves to regulate the position of the electronic component 8 sucked by the suction nozzle 13 in one direction (X-axis direction). The position in the direction perpendicular to this (Y-axis direction) is adjusted by a pair of adjustment claws 1 of the component position adjustment device 10 installed on the base 1.
Do it on 06.

10 chuck stop positions 81 on throat 6 for parts installation
~31G, respectively, Sl is the component receiving position, S3 is the component regulation position in the Y-axis direction, S4 is the component detection position, S5 is the chuck rotation position, S6 is the component mounting position, S7 is the chuck rotation return position, and S8 is the defective component. This is the discharge position. Further, the rotation section from Sl to 32 is a component regulation section in the X-axis direction. A component position regulating device 10 is disposed at the component regulating position S3, and a component detecting device 11 is disposed at the component detecting position S4. A chuck rotation device 12 and a chuck return rotation device 12' are installed at the chuck rotation position S5 and the chuck return rotation position S7, respectively. A box 196 is placed as a parts receiver at the defective parts discharge position S8.

As shown in FIGS. 4 and 6, the component mounting head 6 has a chuck mounting shaft 26 attached to the outer periphery of a rotating frame 24 via a slide bearing 25 so as to be movable up and down and rotatable. The slide bearing 25 has a bearing metal 25a.

The chuck 9 is provided at the lower end of the chuck mounting shaft 26. The rotating frame 24 is fixed to the rotating main shaft 27 via a clamp element 28 with a nut 28'. The rotating main shaft 27 is rotatably supported by a bearing 31 in a cylindrical main shaft housing 30 that projects from the lower surface of the head frame 29 of the base 1 .

As shown in FIG. 7, the chuck mounting shaft 26 has a vertical drive block 34, a chuck transmission gear 35, and a rotation locking member 75 attached to its upper portion. Chuck transmission gear 35
is the rotating lever 6 of the chuck rotating device 12 (Fig. 6).
It meshes with a chuck drive gear 36 provided at 3. The weight of the chuck mounting shaft 26 is supported by a chuck mounting shaft lifting spring 39 via a vertical drive proc 34. The chuck attachment shaft lifting spring 39 is housed within a cylindrical rotation-stopping and spring holding shaft 40 .

The detent/spring holding shaft 40 is fitted into a guide hole 41 formed in the slide bearing 25 of the chuck mounting shaft 26 so as to be able to move up and down.

A cam follower 42 is rotatably attached to the vertical drive block 34, and a vertical drive groove 43 is formed therein. The cam follower 42 is connected to the main shaft nozzle/using 30 (sixth
It engages with a groove-shaped fixed cam 44 for upper and lower chucks provided over the entire circumference of the fixed cam cylinder 3 on the outer periphery of the figure. The fixed cam 44 for upper and lower chucks is located at each chuck stop position 81 to 81.
Component position adjustment device 10 and component detection device 1 placed at
It maintains the chuck height appropriately for each type of equipment, and has a cam curve 46 shown in the developed view of FIG.

If each device such as the component position adjustment device 10 is arranged at a constant height, the fixed cam 44 for raising and lowering the chuck is unnecessary. The vertical drive groove 43 of the vertical drive block 34 engages with engagement rollers 47a and 48a of a suction cam lever 47 (FIG. 6) and a mounting cam lever 48 provided at the component receiving position S1 and the component mounting position S6. . engagement roller 47a,
48a fits into a guide hole 241 provided along the vertical direction in the sliding guide 240, and is prevented from steadying by the guide hole 241. The sliding guide 240 has a cylindrical shape that is loosely fitted around the outer periphery of the fixed cam cylinder 3 and fixed to the rotating frame 24, and a guide hole 241 is provided for each chuck mounting shaft 26. As shown in FIG. 6, the regulating claw 14 of the chuck 9 is attached to the chuck mounting shaft 26 so as to be rotatable in opening and closing about the support shaft 143. A pawl opening/closing ring 95 is attached to the chuck mounting shaft 26 so as to be movable up and down, and the vertical movement of the pawl opening/closing ring 95 opens the regulating pawl 1 through a ring mechanism (not shown).
4 opening and closing are performed. The claw opening/closing ring 95 has a cam follower 96 and is guided by a fixed cam 103 for opening/closing the claw. The fixed cam 103 for opening and closing the pawl is formed on the fixed cam cylinder 3 on the outer periphery of the main shaft nozzle 30 (FIG. 6). The chuck attachment shaft 26 has a suction path 89 that is open to the suction nozzle 13 inside.

The air path of the suction nozzle 13 will be explained. Suction nozzle 1
3 is a component mounting position S6 and a defective component discharge position S8, which enable blowing out of compressed air for component discharge, and a switching knob 120 (FIGS. 9 to 13) is provided in the air path. be.

The switching valve 120 is normally operated as shown in FIG. 11(A).
The valve body 152 of the negative pressure path 141' opens, and the positive pressure path 142 opens.
The valve body 155 ' is closed, and by pushing the valve switching lever 132, the open/closed state is reversed as shown in FIG. 11(B).

The switching valve 120 is located between each chuck mounting shaft 26 and is mounted on the rotating frame 24 of the component mounting head 6. To explain the air path, the outlet 121 of the switching valve 120
From the pipe connection part 90 at the upper end of the chuck mounting shaft 26,
A flexible Neuip 122 is connected. The negative pressure inlet 123 on the lower surface of the switching valve 120 is connected to the pipe 125
It is connected to the vacuum manifold 126 at the lower end of the rotating main shaft via. The vacuum manifold 126 is connected to the spindle internal negative pressure path 125' passing through the rotating main shaft 27, and the upper end of the main spindle negative pressure path 125' is pipe-connected to a negative pressure supply source via a low rigidity joint 127. ing. The positive pressure inlet 124 of the switching valve 120 communicates from the rotating frame positive pressure path 128 in the rotating frame 24 to the housing internal positive pressure path 129 of the main shaft housing 30 . The housing internal positive pressure path 129 is provided only at the component mounting position S6 and the defective component discharge position S8, and when the rotating frame 24 rotates, the rotating frame internal positive pressure path 128 is aligned with the housing internal positive pressure path 129. Then, both positive pressure paths 128 and 129 are communicated. 130 is its communication surface.

The rotation frame internal positive pressure path 128 is open to the atmosphere in a non-communicating state. The housing internal positive pressure path 129 is connected to a compressed air supply source via a vibrator 131 at its upper end.

The valve operating valve X-132 of the switching valve 120 is formed in an L shape and is connected to the valve main body 134 via the fulcrum and 7133.
It is rotatably supported by the valve fixed cam 135 in contact with the vertical piece, and also by pressing the horizontal piece with upper and lower valve dogs 136. Attach a cam follower 137 to the vertical piece,
A dog contact roller 138 is attached to the horizontal piece.

The fixed cam 135 for opening and closing the knob 135 is attached to the main shaft no. 1 housing 3.
It is provided on the outer circumferential surface of the fixed cam cylinder 3 on the outer circumference of 0.

As shown in FIG. 8, the range in which the valve operating lever 132 of the valve fixed cam 135 is pushed down is the component mounting position S6.
The range is from 1s1 to parts receiving position 1s1. The upper and lower valve dogs 136 are provided at the component mounting position S6, and are driven up and down by the rotation of a valve cam (not shown) via a lever 139.

The internal structure of the switching valve 120 is shown in FIGS. 12 and 13.
It is configured as shown in the figure. The valve body 134 is
It has a negative pressure chamber 141 which becomes a negative pressure path 141' in FIG. 11, and a pressure control chamber 142 which becomes a positive pressure path 142', into which a negative pressure rod 143 and a positive pressure rod 144 are inserted. . Both rods 143.144 have bearings 145.1
46 so as to be freely protrusive and retractable, and springs 147, 148
The roller 1 of the valve operating lever 132 is urged to protrude by
49 is pressed. 151 is a sealing material. The valve operating lever 132 hits the stopper 151 and is held at a constant angle. A valve body 153 is attached to the lower end of the negative pressure rod 143 via a valve body holding member 152, and when lowered, the valve body 153 closes the negative pressure inlet 123. Valve body 1
53 is held by a valve 154 so as to be elastically pushable.

The positive pressure side loft 144 is lowered to open the normally closed valve body 15.
5 against the spring 156 to open the upper chamber portion and the lower chamber portion of the positive pressure chamber 142.

156 is a sealing material. The positive pressure inlet 124 is connected to the positive pressure chamber 1
It is provided in the lower chamber part of 42. The outlet 142a of the positive pressure chamber 142 and the outlet 141a of the negative pressure chamber 141 open to one outlet 121 (FIG. 13).

Next, the operation of the above configuration will be explained. As shown in FIG. 8, each chuck 9 mounted on the component mounting head 6 picks up the electronic component 8 from the component supply cassette 22 at a position S1 with a suction nozzle 13, and mounts it onto the circuit board 2 at a position S6. During this time, the regulating claw 14 on the chuck 9 side and the component position regulating device 10
Centering of the electronic component 8 with respect to the suction nozzle 13 is performed using the regulating claw 106 . Further, the component detection device 11 detects whether or not the electronic component 8 is attracted to the suction nozzle 13 in an appropriate posture. Furthermore, the chuck rotation device 12 rotates the chuck 9 to adjust the angle of the electronic component 8 to an arbitrary angle with respect to the circuit board 2 .

The chuck return rotation device 12' is a chuck rotation device 12.
The chuck 9 is rotated in the opposite direction by the angle θ rotated in , and returned to the original angle.

The operation of the suction nozzle 13 and the switching valve 120 will be explained. As shown in FIG. 8, from the suction position S1 to the mounting position S
6, the valve operating lever 132 is not pressed down by the valve fixed cam 135 (FIG. 9), and the switching valve 120 maintains the negative pressure path 141' open. Therefore, the suction nozzle 13 maintains the suction state of the electronic component 8. If the mounting position S6 is lost, the valve operation lever 132 is pushed down by the valve upper and lower dogs 136 while the component mounting head 6 is stopped, and the switching valve 120 becomes in a state where the positive pressure path 142' is opened. .゛Also, this position S
At 6, the pressure control path 128 within the rotary frame is aligned with the positive pressure path 129 outside the housing.

Therefore, compressed air is blown out from the suction nozzle 13.

This blowing prevents the electronic component 8 from remaining attached to the suction nozzle 13, and ensures that the electronic component 8 is aligned with the circuit board 2'. If the suction posture of the electronic component 8 is detected to be poor at the component detection position S4, the upper and lower valve dogs 136 are not lowered at the mounting position S6, and compressed air is not blown out from the suction nozzle 13. Further, the regulating claw 14 on the chuck 9 side also does not open. Therefore, the electronic component 8 remains held by the chuck 9.

After passing the mounting position S, the valve operating lever 132 is pushed down by the valve fixed cam 135, and is maintained in this depressed state until it reaches the suction position S1. Therefore, the positive pressure path 142' of the switching valve 120 is in an open state, but since the positive pressure path 128 in the housing is provided only at positions S6 and S8, the suction nozzle 13 is in an open state to the atmosphere. When the position S8 is reached, the rotary frame positive pressure path 128 is aligned with the housing positive pressure path 129, so compressed air is blown out from the suction nozzle 13.

Therefore, the electronic component 8 that has been held by the chuck 9 due to the detection that the suction posture is defective is dropped and ejected. In addition, while the regulating claw I4 goes from position S6 to S8,
Open gradually.

Although it operates in this manner, the switching valve 120 and its switching means have the following advantages.

That is, the switching valve 120 opens the internal positive pressure path 142 by the rotation of the valve operating lever 132 which is returned by the spring.
' and the negative pressure path 141', and the valve operation lever 132 is rotated by the valve fixed cam 135 and the valve upper and lower dogs 136, so that the valve operation lever 132 can be rotated regardless of whether the component mounting head 6 is stopped or rotated. It can be switched without any change. That is, by rotating the component mounting head 6, '
Furthermore, the position can be switched using the upper and lower valve dogs 136 while the component mounting head 6 is stopped at the mounting position S6. In addition, while the component mounting head 6 rotates, the valve fixed cam 135 holds the valve operation lever 132 in the pushed state, so the switching valve 120
No internal clamping device mechanism is required. Therefore, the structure of the switching valve 120 is simple, and failures are reduced.

Further, since the component mounting head 6 is not provided with a means for driving the switching valve 120, there is no problem that the rotating portion becomes large.

In the above embodiment, the suction nozzle 13 and the switching valve 120 are mounted on the rotating component mounting head 6, but the present invention is applicable to a device that transports the switching valve 120 along a t-0 circular path or various other paths. can do. Furthermore, this invention is applicable not only to an electronic component mounting device, but also to a mounting device for electronic components.
It can be used in general devices that require transfer of switching valves.

ADVANTAGEOUS EFFECTS OF THE INVENTION The valve switching device of the present invention has the advantage that a switching operation can be performed regardless of whether the switching valve is being transferred or stopped, and a valve switching device with a simple structure can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an electronic component mounting device equipped with a valve switching device according to an embodiment of the present invention, and FIG. 2 is a front view thereof.
3 is a side view, FIG. 4 is a perspective view of the component mounting head, FIG. 5 is a schematic plan view, FIG. 6 is a vertical sectional view of the component mounting head, and FIG.
The figure is a cross-sectional view of the chuck mounting shaft and the chuck, FIG. 8 is an explanatory diagram of the operation of the component mounting head in the unfolded state, and FIG. 9 is a longitudinal section of the component mounting head at a different angle from FIG. 6. 10 is a plan view showing the air path of the component mounting head, FIGS. 11(A) and 11(B) are diagrams illustrating the operation of the switching valve, and FIG. 12 is an illustration of the switching valve. The front view and FIG. 13 are also sectional views of the switching valve. DESCRIPTION OF SYMBOLS 1... Base, 2... Circuit board, 4... XY table, 5... Adhesive applicator, 6... Component mounting head, 8... Electronic components, 9... Chuck , 10... Component position adjustment device, 11... Component detection device, 12...
Chuck rotation device, 13... Suction nozzle, 14...
Regulating claw, 24...Rotating frame, 26...Chuck mounting shaft, 120...Switching valve, 132...Valve operating lever, 135...Fixed cam for valve, 136...Upper and lower dog for valve (Pushing member) 141'...Negative pressure path, 1
42'...Positive pressure path Figure 1 Figure 2 Figure 3 a Figure 4

Claims (1)

[Claims] A switching valve has a rotatable control lever and a return spring thereof, and can selectively open and close an internal positive pressure path and a negative pressure path by rotating the control lever; a transfer device that transfers intermittently; a fixed cam that is provided along the fixed path and rotates the operating lever; and a pusher that is provided at a stop position of the transfer path and moves forward and backward to rotate the switching valve. A valve switching device comprising a member.