JP2003008290A - Quick-pushup mechanism of surface mounting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick-pushup mechanism of a surface-mounting machine, which relaxes the shock on a board and reduces the cycle time to enhance the working efficiency. SOLUTION: The mechanism of pushing up a clamp plate 36 of a surface- mounting machine pushes up a board carried and is set at a specified position through the clamp plate 36, and mounts a chip component on the board. Further, the mechanism comprises a tandem cylinder (drive means) 17, and a speed switching means for changing the lifting speed on the way of a lifting process of the clamp plate 36 by the cylinder 17. The speed-switching means changes the lifting speed on the way of the lifting process of the clamp plate 36, such that the plate 36 slows down only near the lifting end, where support pins erected on the clamp plate 36 actually contacts the board and speeds up on other ways. This relaxes the shock on the board and reduces the cycle time to raise the working efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mounter quick push-up machine for mounting a chip component on a substrate.

[0002]

2. Description of the Related Art In a surface mounter for mounting minute electronic components such as ICs, resistors and capacitors (hereinafter collectively referred to as "chip components") on a substrate, the substrate set at a predetermined position is used as a clamp plate. The substrate is pushed up by the upright support pins, the chip component is mounted on the substrate thus pushed up, and the substrate on which the chip component is mounted is lowered to its original position.

By the way, in order to minimize the impact on the substrate, it is necessary to decelerate the clamp plate at the rising end. For this reason, conventionally, a cam follower is attached to the tip of the link that rotates in the angle range of 0 ° to 90 °. A mechanism has been adopted in which the clamp plate is supported via the and the link is rotated by a cylinder to move the clamp plate up and down. According to this mechanism, the clamp plate can be decelerated near the rising end of the clamp plate.

[0004]

However, it is only about 1/6 of the cylinder stroke that the support pins erected on the clamp plate are actually in contact with the substrate, up to a speed at which the substrate is not impacted. When the driving speed is reduced, there is a problem that the operation time is lost over the entire stroke and the cycle time becomes long.

The present invention has been made in view of the above problems, and its object is to reduce the impact on the substrate while
It is an object of the present invention to provide a quick push-up mechanism for a surface mounter that can shorten the cycle time and improve work efficiency.

[0006]

In order to achieve the above object, the invention according to claim 1 is a surface mounter for pushing up a substrate which has been conveyed and set to a predetermined position by a clamp plate to mount a chip component on the substrate. The mechanism for pushing up the clamp plate includes drive means and speed switching means for switching the ascending speed during the process of raising the clamp plate by the drive means.

According to a second aspect of the present invention, in the first aspect of the present invention, the drive means is a cylinder, and the speed switching means is a speed switching valve operated by vertical movement of the clamp plate. Is characterized by.

According to a third aspect of the present invention, in the first aspect of the present invention, the driving means is composed of tandem cylinders arranged in series, the strokes of both cylinders are two types, long and short, and both cylinders are driven simultaneously. Is characterized by.

A fourth aspect of the invention is characterized in that, in the third aspect of the invention, the stroke speed of the cylinder on the short stroke side is set higher than that of the cylinder on the long stroke side.

According to a fifth aspect of the invention, in the third or fourth aspect of the invention, the stroke of the cylinder is converted into a rotational movement of a link by a rack and pinion mechanism, and the stroke is supported by the tip of the link. The feature is that the clamp plate is moved up and down.

Therefore, according to the present invention, the ascending speed is switched during the ascending process of the clamp plate by the speed switching means, and the clamp plate is provided only near the ascending end where the support pin erected on the clamp plate actually contacts the substrate. Since it can be decelerated and can be accelerated in other cases, it is possible to reduce the cycle time while improving the work efficiency while reducing the impact on the substrate.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First Embodiment> FIG. 1 is a plan view of a surface mounting machine. On a machine base 1 of the surface mounting machine, a pair of support blocks 2 extending in the Y-axis direction are arranged in parallel. Each support block 2 is provided with a fixed rail 3 and a ball screw shaft 4 extending in the Y-axis direction. Here, each ball screw shaft 4 is rotatably supported, and this is rotationally driven by a Y-axis servomotor 5.

A head unit support member 6 is supported on the pair of fixed rails 3 so as to be movable in the Y-axis direction along the fixed rails 3, and both end portions of the head unit support member 6 are supported. The ball screw shaft 4 is threadably inserted. The head unit support member 6 is provided with a guide member 7 extending in the X-axis direction and a ball screw shaft (not shown), and the ball screw shaft is rotationally driven by an X-axis servomotor 8. Then, the head unit support member 6
Is provided with a head unit 9 movably along the guide member 7, and the ball screw shaft (not shown) which is rotationally driven by the X-axis servomotor 8 is threadably inserted into the head unit 9. is doing.

When the substrate W conveyed in the X-axis direction on the machine base 1 by a conveyer (not shown) such as a conveyor is positioned and set at a predetermined work position shown in FIG. The substrate W is pushed up by the quick push-up mechanism, and the chip unit is mounted on the pushed substrate W by the head unit 9.

That is, when the Y-axis servomotor 5 is driven to rotate the ball screw shaft 4, the head unit support member 6 moves in the Y-axis direction along the fixed rail 3 to drive the X-axis servomotor 8. If a ball screw shaft (not shown) is rotationally driven, the head unit 9 moves along the guide member 7 in the X-axis direction, so that the head unit 9 can move to any position on the XY plane. Therefore, the head unit 9
Moves to a component supply unit (not shown), receives the chip component, adsorbs the chip component, moves to a predetermined position on the substrate W, and mounts the chip component on the substrate W.

When all the chip components are mounted on the substrate W by repeating the above work, the substrate W is lowered to the original position by the quick push-up mechanism according to the present invention,
The substrate W is transferred in the X-axis direction by a transfer unit (not shown).

Next, the quick push-up mechanism according to the present invention will be described with reference to FIGS. Incidentally, FIG.
Is a plan view of a quick push-up mechanism according to the present invention,
3 is a view in the direction of arrow A in FIG. 2, FIG. 4 is a view in the direction of arrow B in FIG. 2, FIG. 5 is a view in the direction of arrow C in FIG. 2, and FIGS. 6 and 7 are of the quick push-up mechanism. FIG. 8 is an air circuit diagram showing the configuration of the drive system, and FIG. 8 is an operation explanatory diagram of the quick push-up mechanism.

Frames 11, 12 and 13, 1 facing each other
As shown in FIGS. 2 and 4, a tandem structure in which two air cylinders 15 and 16 as driving sources are connected in series inside the frame 11 surrounded by a rectangular frame A cylinder 17 is arranged. Here, as schematically shown in FIG. 6, the air cylinder 15,
A chamber S defined by pistons 18 and 19 in 16
1, S2 and S3, S4 are formed respectively, and rods 20 and 21 extend integrally from the pistons 18 and 19, respectively. In the present embodiment, the piston strokes of the air cylinders 15 and 16 (hereinafter simply referred to as strokes) are set to two types, long and short. Specifically, one air cylinder 15 has a short stroke of 20 mm, The stroke of the other air cylinder 16 is 32 mm
And is set long.

By the way, as shown in FIGS. 2 and 4, the end portion of the rod 20 of the air cylinder 15 on the short stroke side is fixed to the frame 14 via a bracket 22, and the air cylinder on the long stroke side is fixed. As shown in FIGS. 2 and 5, a slider 23 is attached to the end of the rod 21 of 16 with bolts 24. The slider 23 is slidably fitted to a guide rail 25 horizontally attached to the inner surface of the frame 11.

A stopper 27 is attached to the bracket 26 attached to the frame 13 so that the air cylinder 15,
The rod 21 is mounted coaxially with the rods 20 and 21 of the air conditioner 16 so that the position of the rod 27 can be adjusted. Movement limits are regulated.

On the other hand, as shown in FIGS. 2, 4 and 5,
A rack 28, which is long in the length direction of the frame 11, is movably supported by a bearing 29 on the outer side of the frame 11, and the rack 28 and the slider 23 are connected to each other via a connecting member 30. Has been done.

Further, as shown in FIGS. 2 and 4, the shaft 3 is provided at a total of four places on both ends of the frames 11 and 12 facing each other.
1 is rotatably supported by a bearing 32, and a link 33 is attached to the inner end of each shaft 31 at a right angle. A cam follower 34 is rotatably supported by a shaft 35 at the tip of each link 33. As shown in FIGS. 3 to 5, a rectangular flat plate-shaped clamp plate 36 is provided with four cam followers 34. It is horizontally supported by the link 33. As shown in FIG. 2, the links 33 facing each other are connected to each other by a connecting member 37.

Further, as shown in FIGS. 2 and 3, a pinion (sector gear) 38 is attached to the outer ends of the two shafts 31 supported by the frame 11 that project outside the frame 11. Each pinion 38 meshes with the rack 28.

By the way, a plurality of support pins 39 (only one is shown in FIG. 3) for supporting the substrate W (see FIG. 1) are erected on the clamp plate 36, and FIG. As shown in FIG. 1, the guide bar 40 extending vertically downward from the lower surface of the clamp plate 36 is
They are fitted and inserted into sleeves 41 provided on the parts 3 and 14.

Next, the structure of the air circuit for driving and controlling the tandem cylinder 17 which constitutes the drive system of the quick push-up mechanism according to the present invention will be described with reference to FIG.

In FIG. 6, 42 is a pressure source such as an air compressor, 43 is a silencer, and two lines a,
b is a pressure source 42 by a 2-position 5-port solenoid valve 44.
Alternatively, it is selectively connected to the silencer 43.

The one line a is branched into lines c and d, and the line c is the chamber S2 of the one air cylinder 15.
And the line d is connected to the chamber S of the other air cylinder 16.
4 and the speed control valves 45 and 46 are connected to the lines c and d.
Are provided respectively.

The other line b is branched into lines e and f, and the line e is the chamber S1 of the one air cylinder 15.
And the line f is connected to the chamber S of the other air cylinder 16.
4 and the speed control valves 47, 48 are connected to the lines e, f.
Are provided respectively. In FIG. 6, 28 is a rack, 38 is a pinion, 33 is a link, 34 is a cam follower, 30 is a connecting member, and 36 is a clamp plate.

As shown in FIG. 1, when the substrate W is positioned and set at a predetermined position of the surface mounter, the solenoid valve 44 is in the state shown in FIG. Is supplied from the line a to the chambers S2 and S3 of the air cylinders 15 and 16 through the lines c and d, and the rods 20 and 21 of the air cylinders 15 and 16 are in the most compressed state (see FIG. 8A). ), The rack 28 is at the rightmost position in FIG. 6, and the pinion 38 that meshes with the rack 28 and the link 33 that rotates together with the pinion 38 are in the state shown by the solid line in FIG. 6, and are linked via the cam follower 34. The clamp plate 36 supported by 33 is in the lower limit position.

In the above state, when the solenoid valve 44 is switched to the state shown in FIG. 7, the compressed air from the pressure source 42 passes from the line b to the lines e and f and the air cylinder 1
5, 16 chambers S1 and S4 are supplied. Then, the rod 20 of the air cylinder 15 on the short stroke side is attached to the frame 1
Since it is fixed to 4, the tandem cylinder 17 as a whole moves in the direction of the arrow as shown in FIG.
Since the rod 21 of the air cylinder 16 on the long stroke side moves in the arrow direction, the rack 28 connected to the rod 21 via the connecting member 30 moves in the same direction. At this time, the air in the chambers S2 and S3 of the air cylinders 15 and 16 is discharged from the silencer 43 into the atmosphere through the lines a and d, respectively.

Here, the speed control valves 45 and 46 control the compressed air so that the stroke speed of the air cylinder 15 on the short stroke side is twice that of the air cylinder 16 on the long stroke side. Therefore, the air cylinders 15, 1
When the stroke speed of 6 is 2V and V, respectively, the rack 28 moves at a speed of 3V in the direction of the arrow.

When the rack 28 moves as described above, the pinion 38 meshing with the rack 28 rotates together with the shaft 31 about the shaft 31, so that the link 33 attached to the shaft 31 moves about the shaft 31. As a result, the clamp plate 36 supported by the link 33 via the cam follower 34 is pushed up.

Then, as shown in FIG. 8B, when the air cylinder 15 on the short stroke side is in the most extended state (when the rotation angle θ of the link 33 reaches θ1 shown in FIG. 4). Then, the movement of the tandem cylinder 17 is stopped immediately before the support pin 39 of the clamp plate 36 contacts the substrate W, and thereafter, only the rod 21 of the air cylinder 16 on the long stroke side is moved as shown in FIG. 8C. It moves at a speed V together with the rack 28.

Therefore, the rotation angle θ of the link 33 is as shown in FIG.
In the range of θ1 to θ2 (= Δθ) (while the support pins 39 of the clamp plate 36 are in contact with and pushing up the substrate W), the rotation speed is decelerated, and the substrate W is slowly pushed up and its impact is exerted. Is alleviated.

Here, the rotation angle θ of the link 33 and the rack 2
FIG. 9 shows the relationship with the moving speed of No. 8 in FIG.
FIG. 10 shows the relationship between the rising speed of the link 33 and the rotation angle θ of the link 33.
11 shows the relationship between the movement amount of the rack 28 and time. 9 to 11, the broken line shows each characteristic when the rack is moved by a single air cylinder having a stroke speed V.

As described above, in the present embodiment, the raising speed is switched during the raising process of the clamp plate 36 (see FIG. 9), and the support pins 39 erected on the clamp plate 36 are actually placed on the substrate W. The clamp plate 36 is decelerated only near the ascending end (the range in which the rotation angle θ of the link 33 is θ1 to θ2 in FIG. 4), and otherwise (the rotation angle θ of the link 33 is 0 to θ1 in FIG. 4). Since the speed is increased in a certain range (see FIG. 10), it is possible to reduce the impact on the substrate W and reduce the cycle time by Δt in FIG. 11 to improve the work efficiency.

When the substrate W on which the chip parts are mounted is lowered to its original position, the solenoid valve 44 is switched to the state shown in FIG.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIGS. Incidentally, FIG.
And FIG. 13 is an air circuit diagram showing the configuration of the drive system of the quick push-up mechanism according to the present embodiment.

In the present embodiment, the clamp plate 36 is directly moved up and down by the air cylinder 49, and the mechanical valve 50 is switched during the operation of the air cylinder 49 in conjunction with the vertical movement of the clamp plate 36.
A feature is that the speed pattern is switched between high speed and low speed by the speed control valves 51 and 52 set to high speed and low speed.

That is, as shown in FIG. 1, when the substrate W is positioned and set at a predetermined position of the surface mounter, the solenoid valve 44 is in the state shown in FIG. 12, and the compressed air from the pressure source 42 is in line. The chamber S of the air cylinder 49 passes through a and d.
1, the rod 53 of the air cylinder 49 is in the most compressed state, and the clamp plate 36 supported by the rod 53 is at the lower limit position.

In the above state, when the solenoid valve 44 is switched to the state shown in FIG. 13, the compressed air from the pressure source 42 is supplied to the chamber S2 of the air cylinder 49 through the line b and the speed control valve 54. At this time, the mechanical valve 50 is in the state shown in FIG. 13, and the air in the chamber S1 of the air cylinder 49 is in the line d and the speed control valve 51 for high speed.
Through the silencer 43 to the atmosphere, the rod 53 of the air cylinder 49 and the clamp plate 36 rise at a high speed.

Then, when the switch member 55 attached to the end of the clamp plate 36 comes into contact with the mechanical valve 50 in the process of raising the clamp plate 36, the mechanical valve 50 is switched as shown in FIG. Since the air in the chamber S1 of the air cylinder 49 passes through the line c and the control valve 52 for low speed, the rod 5
3 and the ascending speed of the clamp plate 36 are reduced.

As described above, also in the present embodiment, the raising speed is switched during the raising process of the clamp plate 36, and the clamp pins 36 are clamped only in the vicinity of the ascending end where they are actually in contact with the substrate. Plate 3
Since 6 can be decelerated and speed can be increased in other cases,
The effect that the cycle time can be shortened and the work efficiency can be improved while alleviating the impact on the substrate is obtained.

[0045]

As is clear from the above description, according to the present invention, the clamp plate of the surface mounter that pushes up the substrate set at a predetermined position by the clamp plate and mounts the chip component on the substrate. To push up the
Since the driving means and the speed switching means for switching the ascending speed during the ascending process of the clamp plate by the driving means are included, it is possible to reduce the impact on the substrate and shorten the cycle time to improve the work efficiency. The effect that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a head unit of a surface mounter.

FIG. 2 is a plan view of a quick push-up mechanism according to the first embodiment of the present invention.

3 is a view in the direction of arrow A in FIG.

4 is a view in the direction of arrow B in FIG.

5 is a view in the direction of arrow C in FIG.

FIG. 6 is an air circuit diagram showing a configuration of a drive system of the quick push-up mechanism according to the first embodiment of the present invention.

FIG. 7 is an air circuit diagram showing a configuration of a drive system of the quick push-up mechanism according to the first embodiment of the present invention.

FIG. 8 is an operation explanatory view of the quick push-up mechanism according to the first embodiment of the present invention.

FIG. 9 is a diagram showing a relationship between a rotation angle of a link and a rack moving speed in the quick push-up mechanism according to the first embodiment of the present invention.

FIG. 10 is a diagram showing a relationship between a rising speed of a clamp plate and a rotation angle of a link in the quick push-up mechanism according to the first embodiment of the present invention.

FIG. 11 is a diagram showing a relationship between a rack movement amount and time in the quick push-up mechanism according to the first embodiment of the present invention.

FIG. 12 is an air circuit diagram showing a configuration of a drive system of a quick push-up mechanism according to Embodiment 2 of the present invention.

FIG. 13 is an air circuit diagram showing the configuration of the drive system of the quick push-up mechanism according to the second embodiment of the present invention.

FIG. 14 is an air circuit diagram showing the configuration of the drive system of the quick push-up mechanism according to the second embodiment of the present invention.

[Explanation of symbols]

15, 16 Air cylinder (driving means) 17 Tandem cylinder (drive means) 28 racks 33 links 34 Cam Follower 36 Clamp plate 38 Pinion 44 Solenoid valve 45-48 Speed control valve 50 Mechanical valve (speed switching valve) 51 High speed control valve 52 Low speed control valve W board

Claims (5)

[Claims] 1. A mechanism for pushing up a substrate set at a predetermined position by a clamp plate and pushing up the clamp plate of a surface mounter for mounting a chip component on the substrate, comprising a driving means and a driving means. A quick push-up mechanism for a surface mounter, comprising a speed switching means for switching a rising speed during a rising process of the clamp plate. 2. The quick mounter for a surface mounter according to claim 1, wherein the drive means is a cylinder, and the speed switching means is a speed switching valve operated by vertical movement of the clamp plate. Push-up mechanism. 3. The quick mounter for a surface mounter according to claim 1, wherein the drive means is composed of tandem cylinders arranged in series, the strokes of both cylinders are two types, long and short, and both cylinders are driven simultaneously. Push-up mechanism. 4. The quick push-up mechanism for a surface mounter according to claim 3, wherein the stroke speed of the cylinder on the short stroke side is set to be higher than that of the cylinder on the long stroke side. 5. A rack and pinion mechanism is used to convert the stroke of the cylinder into a rotational movement of a link, and the clamp plate supported by the tip of the link is moved up and down. Quick push-up mechanism for the surface mounter described.