JP3513255B2 - Mounting head lifting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component supported at the lower end of a vertical moving body by vertically swinging a lever oscillating by the rotation of a cam and vertically moving the lever. The present invention relates to a mounting head lifting device that lifts and lowers a mounting head for holding.

[0002]

2. Description of the Related Art The rotation of a cam of this kind causes a lever to swing in the vertical direction and a vertical moving body supported by the lever to move up and down to hold an electronic component attached to the lower end of the vertical moving body. A mounting head elevating device for elevating the mounting head is disclosed in Japanese Patent Laid-Open No. 5-195824.

In this type of head lifting device, the head is always lifted by the rotation of the cam. However, depending on the head moving to the mounting station, the posture of the electronic component to be sucked is abnormal or the electronic component is sucked. If there is no head, or if there is a head that cannot be used among a plurality of heads, then it may not be desired to lower the head.

Therefore, as shown in FIGS. 8 and 9, the swing lever 9 having the cam follower 91 that engages with the cam 90 is provided.
Restriction lever 9 driven by cylinder 93 at one end of 2
A technique is conceivable in which the lever 4 is engaged to regulate the lever 92 in a state in which the vertical moving body 95 is maintained in the raised position. When the regulating lever 94 regulates the lever 92 in the state shown in FIG. 8, even if the cam 90 rotates as shown in FIG. 9, the lever 96 resists the biasing force of the spring 96 pressing the spring 96 and the vertical moving body 95 downward. It is possible to prevent 92 from swinging so that the mounting head (not shown) supported at the lower end of the vertical moving body 95 does not descend. When the cylinder 93 releases the engagement of the lever 94 with the lever 92, the lever 92 is urged by the spring 96 by the rotation of the cam 90 and swings, and the mounting head moves up and down as the up-and-down moving body 95 moves up and down. It is a thing.

[0005]

However, in the above-mentioned prior art, as shown in FIG. 8, one end portion of the lever 92 must be lengthened and the regulation lever 94 must be engaged with the tip portion thereof. This is because a large amount of force is required for the regulation if the regulation lever is brought into contact with and regulated at a location close to the fulcrum of rotation of the lever 92, and a regulation mechanism including a cylinder and the like is installed in terms of space. It is because it is difficult. Since the lever that engages with the cam is lengthened in this way, the inertia of the cam follower and the lever increases, and it is necessary to increase the spring force of the spring that presses the lever against the cam. Alternatively, there are drawbacks that the cam followers, bearings, etc. of the rotation support shaft of the lever are prematurely worn and a large force is required to drive the cam.

Therefore, an object of the present invention is to make it possible to regulate the lowering of the mounting head without increasing the length of the lever that engages with the cam for raising and lowering the mounting head.

[0007]

For this reason, according to the present invention, the rotation of the cam causes the lever to swing in the vertical direction and the vertical moving body supported by the lever to move up and down to be supported at the lower end of the vertical moving body. In the mounting head lifting device for lifting and lowering the mounting head for holding the electronic component, the mounting head lifting device is provided with a support member that supports the vertical moving body at a position separated from the lever and restricts the lowering.

Further, according to the present invention, the lever swings in the vertical direction due to the rotation of the cam, and the vertical moving body supported by the lever moves up and down to hold the electronic component supported at the lower end of the vertical moving body. In a mounting head elevating device for elevating and lowering the mounting head, a moving body that is mounted so as to be movable in the left-right direction with respect to the vertical moving body and that moves on the lever while being supported by the lever, A support member for supporting the moving body that has been transferred from above the lever and restricting the lowering of the vertical moving body is provided.

[0009]

According to the first aspect of the invention, the support member supports the vertical moving body which is supported by the lever swinging by the rotation of the cam and which moves up and down at a position apart from the lever to restrict the lowering.

According to the second aspect of the present invention, the support member is supported by the lever swinging by the rotation of the cam through the moving body that is moved while being supported by the lever, and the vertically moving body that moves up and down is removed from the lever. By supporting the moving body at the position, it is regulated so as not to descend.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

2 and 3, reference numeral 1 is a Y table which moves in the Y direction by the rotation of the Y-axis motor 2, and 3 is an X table.
This is an XY table that moves in the X and Y directions by moving in the X direction on the Y table 1 by the rotation of the shaft motor 4, and a chip-shaped electronic component 5 (hereinafter referred to as a chip component or component) is mounted. The printed circuit board 6 is fixedly mounted on a fixing means (not shown).

Reference numeral 7 denotes a supply table, on which a large number of component supply devices 8 for supplying the chip components 5 are arranged. Reference numeral 9 denotes a supply base drive motor, which rotates the ball screw shaft 10 to screw the ball screw shaft 10 into a nut 11 which is fixed to the supply base 7.
It is guided by and moves in the X direction. Reference numeral 13 denotes a rotary table that rotates intermittently, and mounting heads 15 having a plurality of suction nozzles 14 are arranged at the outer edge of the table 13 at equal intervals according to the intermittent rotation pitch.

Reference numeral I denotes a suction station where the suction nozzle 14 sucks and picks up the component 5 from the supply device 8 by intermittent rotation of the rotary table 13 and at which the mounting head 15 is stopped. Adsorb 5

Reference numeral 16 denotes a component recognition device for recognizing the displacement of the component 5 attracted by the suction nozzle 14 by recognizing the lower surface of the component 5 by a camera in a predetermined visual field range and recognizing the imaged screen. -Provided in Option II.

The stop position of III is the mounting station, and the component 5 attracted by the suction nozzle 14 of the station III is mounted on the substrate 6 by lowering the mounting head 15.

Reference numeral 20 denotes an up-and-down moving bar, which engages with a swing lever 21 of the component supply device 8 to swing the component storage tape (not shown) in which the chip components 5 are enclosed at predetermined intervals according to the spacing. The chip component 5 is supplied to the component suction position of the suction nozzle 14 by intermittent feeding. 22 is a tape reel around which the component storage tape (not shown) is wound.

The rotary table 13 is intermittently rotatably suspended from the support frame 24 as described above. The mounting head 15 is attached to a linear guide 26 via a head block 25 and is vertically movable with respect to the rotary table 13.

A support plate 27 is provided on the upper end of the head block 25.
And a pair of rollers 28 are provided on the support plate 27 in the vertical direction.

At the lower part of the support frame 24, a cam body 30 having a cylindrical rib cam 29 is formed.
3, and the mounting head 15 is supported by the roller 28 sandwiching the rib cam 29.
Therefore, when the rotary table 13 rotates, the mounting head is guided by the rib cam 29 and moves up and down according to its height.

The rib cam 29 is notched at a position where the mounting head 15 stops at the suction station I and the mounting station III, and the notched position has a U-shaped cross section which moves up and down. A roller rest 31 is arranged. The roller 28 is transferred to the roller rest 31 and the roller rest 31 is moved up and down, so that the mounting head 15 is mounted at the suction station I and the mounting station III.
Can be moved up and down.

A mechanism for raising and lowering the roller rest 31 will be described with reference to FIGS. 1, 4, 5, and 6. This mechanism consists of adsorption station I and mounting station III.
However, since they have the same mechanism, they will be described using the same reference numerals.

The roller rest 31 is attached to an elevating rail 32 and moves up and down by being guided by a guide 33. A horizontal rail 34 extending in the horizontal direction is integrally attached to the upper end of the elevating rail 32 to elevate and lower. The rail 32 and the horizontal rail 34 constitute a vertical moving body.

A guide portion 37 provided on a moving body 36 slides with respect to the horizontal rail 34 so that the moving body 36 can move horizontally in the horizontal direction. It is the same even if the horizontal position changes.

A cam follower 39 is provided below the moving body 36.
Is rotatably provided, and the cam follower 39 is supported by an arm 42 of a swing lever 41 swinging around a support shaft 40, and moves on the arm 42 as the moving body 36 moves in the horizontal direction. Roll around. A pair of rollers 43 is rotatably provided in the moving body 36 in the horizontal direction, and a stroke variable plate 45 having a guide piece 44 sandwiched by the rollers 43 is rotated by a stroke motor 46 and a ball screw 47 is rotated. By being attached to the nut portion 48 of the rail and moving in the left-right direction, the moving body 36 moves in the left-right direction to the rail 34.
Move to be guided by. Since these mechanisms for moving the stroke varying plate 45 in the horizontal direction are fixed to the fixed arm 53 fixed on the support frame 24, the stroke varying plate 45 moves only in the horizontal direction.

On the other hand, since the guide piece 44 extends in the vertical direction, the moving body 36 can be moved up and down while the roller 43 rolls. As the moving body 36 moves up and down, the horizontal rail 34 and the vertical rail 34 move up and down. The rail 32 moves up and down.

A cam follower 49 is attached to the swing lever 41.
Is provided, and the plate cam 51 that rotates around the cam shaft 50 is engaged. The cam follower 49 is a lever 41
It is pressed against the outer peripheral surface of the cam 51 by the urging force of the compression spring 52 for urging the cam 51 and the compression spring 54 for urging the elevating rail 32 downward.

Therefore, when the swing lever 41 swings in the vertical direction by the rotation of the cam 51, the cam follower 39, that is, the moving body 36 supported by the arm 42 moves up and down along the guide piece 44 in accordance with the vertical movement. As a result, the lifting rail 32 and the roller rest 31 move up and down, and the mounting head 15 moves up and down.

The rotation of the cam shaft 50 is performed by the rotary table 13
The cam 51 is synchronized with the rotation of the rotary table 13 because it is driven by a drive motor (not shown) that rotates intermittently.

A support 56 is provided on the support frame 24.
4, the cam follower 39 of the moving body 36 at the highest position as shown in FIG.
It is designed to be able to move and roll while rolling on the upper two. For this reason, when the swing lever 41 is in the raised position as shown in FIG. 4, the height of the upper surface of the arm 42 and the height of the upper surface of the support base 56 are made to be the same, and the gap between them is made as small as possible to prevent a transfer shock. It is supposed not to. When the moving body 36 is supported on the support base 56, the moving body 36 does not move up and down even if the swing lever 41 swings.
Therefore, the mounting head 15 also does not move up and down.

Next, the control block of the electronic component automatic mounting apparatus will be described with reference to FIG.

Reference numeral 60 denotes a CPU which, based on the data stored in the RAM 61, generally controls the operation of the electronic component automatic mounting apparatus for mounting components according to a program stored in the ROM 62. Interface 63 to CPU 60
Also, control objects such as the X-axis motor 4, the Y-axis motor 2, the supply base drive motor 9 and the stroke motor 46 are connected via the drive circuit 64.

Further, the suction nozzle 14 with respect to the mounting head 15 is a pulse motor 65 built into the head 15 of the apparatus.
It is possible to rotate about the vertical axis.

The operation will be described below with the above configuration.

When the automatic operation of the electronic component automatic mounting apparatus is started, the supply base 7 moves according to the step of the mounting data (not shown) stored in the RAM 61, and the component supply apparatus 8 designated by the data is moved. The suction nozzle 14 is moved to the component take-out position.

On the other hand, intermittent rotation of the rotary table 13 causes one of the mounting heads 15 to move to the adsorbing station I, and the swing lever 41 remains in the state shown in FIG.
The roller 2 of the head 15 on the roller rest 31 of the section I
8 transfers and stops.

During the state of FIG. 4, the CPU 60 stores data indicating the height position of the upper surface of the component 5 in the state where the component 5 to be sucked next is stored in the component supply device 8.
1 is read out, and the stroke motor 46 is rotated so as to match the height position, and the position of the guide piece 44, that is, the moving body 36 is adjusted. This is because the descending stroke of the moving body 36 changes depending on the contact position of the cam follower 39 from the support shaft 40 on the arm 42 of the swing lever 41, and the moving body 36 moves in the horizontal direction for a desired descending stroke. The position is changed.

Next, the swing lever 4 is rotated by the rotation of the cam 51.
1 swings and descends, the moving body 36 descends, and the moving body 36
As shown in Fig. 6, the stroke corresponding to the horizontal position of the part is lowered and stopped as shown in FIG.
Is sucked into the suction nozzle 14 by vacuum, and then the mounting head 15 is lifted to take out the component 5.

Next, the mounting head 15 is moved to the next stop station by the rotation of the rotary table 13.

Next, when the rotary table 13 repeats intermittent rotation, the mounting head 15 holding the component 5 moves to the recognition station II, and the recognition device 16 causes the component 5 to move.
The positional deviation of the suction nozzle 14 with respect to the suction nozzle 14 is recognized, and thereafter, the rotation of the pulse motor 65 is performed so that the angular position is designated by the mounting data.

Next, the rotary table 13 is repeatedly rotated intermittently, and the head 15 is attached to the mounting station II.
Move to I.

In the mounting station III, the data of the component thickness of the attracted component 5 is read by the CPU 60.
It is read from AM61, and the mounting step is performed according to the data.
The stroke motor of the section III is rotated to move the moving body 36.
Is positioned.

Next, the movable body 36 is lowered by the swing of the swing lever 41, the mounting head 15 is lowered by the designated lowering amount set by the data, and the suction nozzle 14 is moved by the spring (not shown) to the component 5 After contacting the substrate 6, the component 5 is mounted on the substrate 6 by lowering the mounting head by a specified distance where it is pressed against the substrate with an appropriate pressure.

At that time, the XY table 3 is moved so that the component 5 is mounted at the XY coordinate position shown in the mounting data.

In this way, for each intermittent rotation of the rotary table 13, in the suction station I and the mounting station III, the moving mounting head 15 or the component 5 or the mounted component 5 to be sucked is moved. Accordingly, the stroke motor 46 is rotated to align the moving body 36.

Next, the component 5 is mounted by a station (not shown).
Is not adsorbed by the adsorption nozzle 14 or is adsorbed in an abnormal posture (a so-called standing state is caused by adsorbing a surface that should not be adsorbed) (recognition). An abnormality may be detected by recognition in Station II.), And when the head 60 reaches the mounting station III,
The stroke motor 46 is rotated, and the ball screw 47 is rotated to move the moving body 36 to the right in FIG. 4, so that the cam follower 39 is moved from the arm 42 to the support 56.

As a result, even if the cam 51 rotates and the rocking lever 41 rocks, the moving body 36, that is, the head 15 does not descend as shown in FIGS. 1 and 5, but is attracted in an abnormal posture. The mounted component 5 is not mounted on the substrate 6.

Further, when it is detected that the mounting head 15 or the suction nozzle 14 is abnormal, or when the data is set by the operator so that the head is not used, the head is detected by the suction station I. , Or when the mounting station III is reached, the moving body 3 is moved as described above.
6 is retracted on the support base 56, and the descent of the head 15 is stopped.

By doing so, the inertia of the lever 41 can be made smaller as compared with the case where the rocking lever 41 is lengthened and its tip is locked by the lever to prohibit the head 15 from descending. The springs 52 and 54 for restraining the cams to the cam can be made to have a small force, the load on the bearing of the support shaft 40 due to the rotation of the lever 41 can be reduced, and the load on the cam follower 49 can also be reduced. The load applied between the elevating rail and the guide 33 can be reduced, the life of these mechanisms can be extended, and the load of the spring can be reduced, so that the motor that rotates the cam (in this embodiment, the motor that rotates the rotary table). The driving force of is small by this amount.

Further, the structure can be simplified without using a drive source such as a cylinder, as compared with the case where the lever is locked by the cylinder and the lowering of the mounting head is prohibited.

[0051]

As described above, according to the present invention, the vertical movement body that supports the mounting head is restricted from descending at a position apart from the lever that swings up and down by the rotation of the cam.
The length of the lever can be shortened, the cam follower,
It is possible to reduce the load on bearings and the like, and to extend the life of them.

[Brief description of drawings]

FIG. 1 is a front view showing a lifting mechanism of a mounting head.

FIG. 2 is a plan view of an electronic component automatic mounting device.

FIG. 3 is a side view of an electronic component automatic mounting device.

FIG. 4 is a front view showing a lifting mechanism of a mounting head.

5 is a cross-sectional view taken along the line AA of FIG. 1 showing the lifting mechanism of the mounting head.

FIG. 6 is a front view showing a lifting mechanism of a mounting head.

FIG. 7 is a control block diagram of the electronic component automatic mounting apparatus.

FIG. 8 is a front view showing a mounting head lifting mechanism according to a conventional technique.

FIG. 9 is a front view showing an elevation mechanism of a mounting head according to a conventional technique.

[Explanation of symbols]

5 Chip-shaped electronic components 15 mounting head 32 Lifting rail (vertical moving body) 34 Horizontal rail (vertical body) 36 Mobile 41 Swing lever 51 plate cam 56 Support base (support member) 26 RAM (storage means)

Claims (2)

(57) [Claims] 1. A mounting head for holding an electronic component supported at a lower end of the vertical moving body by swinging a lever in a vertical direction by rotation of a cam and vertically moving a vertical moving body supported by the lever. The mounting head elevating device for elevating and lowering a mounting head elevating device, comprising: a supporting member that supports the vertical moving body at a position deviated from the lever and restricts descending. 2. A mounting head for holding an electronic component supported at a lower end of the vertical moving body by vertically swinging a vertical moving body supported by the lever by swinging the lever in a vertical direction by rotation of a cam. In a mounting head elevating device for elevating and lowering, a moving body that is attached to the vertical moving body so as to be movable in the left-right direction and moves on the lever while being supported by the lever, and the lever provided at a position apart from the lever. A mounting head raising / lowering device, comprising: a supporting member that supports a moving body that has been transferred from above and controls a lowering of a vertical moving body.