JPH0267799A - Bit fixing mechanism and exchanging device for chip mounter - Google Patents

Abstract

PURPOSE:To reduce the impact force between the bit of a chip mounter and chip parts by providing the first spherical body and the first means which engages the 1st spherical body with the first groove section of the bit to the first fixing and releasing device. CONSTITUTION:A bit 3 which is provided with the first groove section 32 and can attract chip parts, carrying body 10 which can move in both X and Y directions, and the first fixing and releasing device 20 which is provided to the lower end section of the carrying body 10 are provided and the device 20 has the first spherical body 23 and first means 21 and 22 which engage the spherical body with the first groove section 32 of the bit 3. When the outside member 22 is at a prescribed position, a projecting section 27 pushes the spherical body 23 inward. When the bit 3 is in a bit fixing mechanism 2, the spherical body 23 is engaged with the first groove section 32 and firmly held by the device 20. When the outside member 22 is not at the prescribed position, the spherical body 23 is released from the pushed-in state and, as a result, the spherical body 23 is disengaged from the groove section 32 and the bit 3 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bit mounting mechanism and a bit exchange device for mounting a chip component onto a circuit board.

A chip mounter for mounting chip components of various types and sizes on a circuit board includes a chip component supply unit that carries chip components across M, a carrier movable in XY and left directions, and a carrier. The bit includes a bit attached to the tip of the body, and the bit attracts chip components through a vacuum pressure passage communicating between the carrier and the inside of the bit.

To mount a chip component onto a circuit board using such a chip mounter, the carrier is first moved onto the chip component supply section, lowered by an air cylinder, sucks the chip component, and then rises onto the circuit board. It moves and descends again to mount the chip parts.

This bit needs to be of an appropriate size depending on the size of the chip component to be attracted, and usually needs to be replaced many times during the process of mounting the chip component onto a single board.

As a device for automatically exchanging this bit, there is a device as shown in FIG.

In the figure, 80 is a carrier movable in XY left directions and up and down directions, 81 is a bit, and 84 is a storage device for storing replacement bits. A damper section 85 is provided below the bit carrier 80, and this damper section 85 includes a columnar section 86,
It consists of a rod 87 connected to a cylindrical portion 86 and a pin 88 provided at the tip of the rod 87. The bin 88 protrudes from an elongated hole 90 provided at the lower end of the bit carrier 80, and allows the damper portion 85 to move up and down with respect to the carrier 80 within the length of the elongated hole 90 in the vertical direction. .

A hole with a diameter slightly smaller than the tip of the bit 81 is formed in the cylindrical portion 86 at the lower end of the conveyor 80, and the head 91 of the bit 81 has a plurality of vertical grooves 92 so as to be elastically deformable. It is provided. Therefore, when the conveyor 80 is lowered and pressed against the head 91 of the bit 81, the head 91 is moved to the columnar part 8.
The cylindrical portion 86 is deformed in the hole 6, and the cylindrical portion 86 is attached to the carrier 80 by elastic force.

The bit 81 has flanges 93 and 94 below the head 91.
It has been damaged.

The storage device 84 includes a bracket 96 having a groove 95 for holding the bit 81, and a member 97 that is movable in the direction of the arrow in the figure with respect to the other bracket 96 by an air cylinder (not shown). This member 97 is attached to the bracket 96 via a spring 98 so that it is always pulled rightward in the drawing.
is connected to.

When attaching the bit 81 to the carrier 80, the carrier 8
After the bit 81 is moved directly above the bit 81, it is lowered by an air cylinder (not shown) to hold the head 91 of the bit 81, and then the member 97 is moved leftward to raise the carrier 80.

Further, when removing the bit 81 from the carrier 80, first move the member 142 to the left, then lower the carrier 80 to hold the bit 81 in the groove 95 of the bracket 96, and then move the member 142 to the left. is moved rightward to insert the groove 98 of the member 97 between the two flanges 93 and 94 of the bit 81 to prevent the bit 81 from moving up and down. Next, the carrier 80 is raised to hold the bit 81 in the groove 98 of the member 97 and the groove 95 of the bracket 96.

Problems to be Solved by the Invention In general, boards are distorted, and there are also variations in the height of chip components mounted on the circuit board, the thickness of the board, and the height of the chip component supply section. If you ignore these and move the carrier 80 up and down, the chip component chibit 8
There is a risk of damage due to the impact caused by the collision with the lower end of 1. For this purpose, the above-mentioned damper section 85 is provided on the conveyor 80, and a constant damper stroke is maintained. This damper portion 85 is often designed so that the impact force between the lower end portion of the bit 81 and the chip component is approximately 30 gf to 100 gf.

However, this level of force is not sufficient to elastically connect the carrier 80 and the bit 81, so it is necessary to push the carrier 80 beyond the damper stroke to achieve the coupling.

For this reason, the vertical stroke of the carrier 80 becomes extremely larger than the stroke for mounting the chip component, which is its original function, and the impact force between the bit 81 and the chip component increases. , there is a risk of damaging the bit.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a bit mounting mechanism and a bit exchange device that can reduce the impact force between the bit of a chip mounter and a chip component.

Furthermore, since the carrier 80 and the bit 81 are coupled using elastic force as described above, the bonding force between the carrier 80 and the bit 81 is not strong.

Therefore, another object of the present invention is to provide a bit mounting mechanism and a bit exchange device that can strongly connect the carrier of a chip mounter and the bit.

Means for Solving the Problems The present invention will be explained based on FIGS. 1A and 1B, which correspond to embodiments.

The bit attachment mechanism of a chip mounter according to claim 1 includes a bit 3 having a first groove portion 32 and capable of sucking a chip component, a carrier 10 movable in XY force directions, and a lower end portion of the carrier. a first bit detaching device 20 provided therein, the first bit detaching device including a first sphere 23 and a first bit dispensing device that engages the first sphere with the first groove portion 36 of the bit. It has means 21 and 22.

The bit attaching mechanism for a chip mounter according to claim 2 is a bit attaching mechanism for a chip mounter according to claim 1, in which the first means 21t 22 for causing the biting stand is provided.
is provided with a first inner member 21 having a first through hole 25 into which the first sphere 23 is loosely fitted and which surrounds the bit, and is movable in the vertical direction with respect to the first inner member. consisting of a first outer member 22 having a first protrusion 27;
When the first outer member is in a predetermined position, the first protrusion pushes the first sphere inwardly, causing the first sphere to engage the first groove of the bit, thereby tightening the bit. It can be fixed.

The chip mounter bit exchange mechanism according to claim 3 comprises:
The bit mounting structure 2 according to claim 1, wherein the bit 3 further has a second groove 36, the storage device 4 for storing a replacement bit, and the storage device 4 provided at the upper part of the storage stomach. and a second bit detaching device 60, the second detaching device having a second sphere 63 and a second means for engaging the second sphere with a second groove of the bit. 61562
has.

The chip mounter bit exchange mechanism according to claim 4 comprises:
In the bit exchange mechanism according to claim 3, the second biting means 6L 62 has a second through hole 65 into which the second sphere is loosely fitted, and a second through hole 65 surrounding the bit.
a second inner member 62 and a second protrusion 66 that is movable in the vertical direction with respect to the second inner member;
an outer member 61 of the bit, and when the second outer member is in a predetermined position, the second protrusion pushes the second sphere inwardly and engages the second sphere with the second groove of the bit. The bit can be fixed by using a bit rest.

Operation In the first attachment/detachment device 20, when the outer member 22 is in a predetermined position, the protrusion 27 pushes the first sphere 23 inward (Fig. 2 A, D, E; Fig. 3 A, E). ). At this time, when the bit 3 is in the bit attachment mechanism 2, the sphere 23 engages with the first groove 36 of the bit 3 and is firmly held by the first detachment device 20 (second figure, E; third Figure A). When the outer member 22 is not in place, the sphere 23
The push-in of the ball 23 and the groove 32 are released, and the bit 3 is released (see Fig. 2B and C).
; Figure 3 85 C2D).

Similarly, in the second attachment/detachment device 60, when the outer member 61 is in a predetermined position, the protrusion 66 pushes the second sphere 63 inward (FIGS. 2A and B).

E; Figure 3 A, B, D, E). At this time, when the bit 3 is in the bit storage device 4, the sphere 63 engages with the second groove 36 of the dot 3 and is firmly held by the second detachment device 57 (FIGS. 2A, B; Figure 3 B, D, E). When the outer member 61 is not in the predetermined position, the sphere 63 and the groove 36 are disengaged and released (Fig. 2 C, D; Fig. 3 C).
.

Example Hereinafter, the present invention will be explained in detail based on the drawings.

1A, 1B, and 1C show an embodiment of the present invention, in which FIG. 1A shows a bit attachment mechanism 2, FIG. 1B shows a bit 3, and FIG. 1C shows a replacement mechanism. FIG. 4 is a sectional view of a bit storage device 4 that stores bits.

The bit attachment mechanism 2 is installed horizontally (
Transport body 10 movable in the xy) direction and the height (Z) direction
, a damper section 11 and a first bit detaching device 20.

The carrier 10 has a pair of elongated holes 12 at its lower end.

The damper section 11 is composed of a rod 13, a pin 14 having a generally rounded shape at the upper end of the rod, and a cylindrical member 15 formed at the lower end of the rod 13. The pin 14 passes through a pair of elongated holes 12 in the carrier 10 and allows the tip portion 11 to move up and down a certain distance with respect to the carrier 10, thereby giving a chisel stroke.

The cylindrical member 15 has a downwardly directed opening 16 and is provided with a pin 17 extending horizontally within the opening 16 .

The first bit removal device 20 (also a hollow cylindrical inner member)
a first inner member) 21, an annular outer member (second outer member) 22 surrounding this inner member 21, and a sphere (first outer member) 21;
) consists of 23 spheres. The inner member 21 and the outer member 22 constitute means for engaging the first sphere 23 with the first groove 32 of the bit 3.

The outer member 22 is always urged downwardly between the inner member 21 and the inner member 21 through a tin 1-shaped tongue 24 provided therein. (first through hole) 25 holes: multiple (for example, 3
f yen) is provided. A sphere 23 is inserted into this through hole 25.
is loosely fitted, and its inner diameter is on the outside (outer member 22 side)
is slightly larger than the diameter of the sphere 23, and the inner side is slightly smaller, so that the sphere 23 can be transferred to the outside. Further, a flange portion 26 is provided at the upper end of the inner member 21. The outer member 22 has a protrusion (first protrusion) 27 on the inside, and in a normal state, when the protrusion 27 is in the position shown in FIG. 23 is pushed inside.

The bit 3 has a head 31 that fits into the opening 16 of the cylindrical member 15, an annular groove (first groove) 32 that engages the first sphere 23 described above below the head 3, It consists of a large diameter section 33 below and a tip section 34 below. The head 31 is provided with a fitting groove 35 that fits with the pin 17, and the outer periphery of the large diameter portion 33 is provided with a vertically elongated or annular groove (second groove) 36 that engages with a second sphere 63, which will be described later.
is provided.

Passages 18 and 37 communicating with each other are provided in the centers of the damper portion 11 and the bit 3, respectively, and are connected to a vacuum pressure source (not shown) via the carrier 10. Further, one seal is provided between the damper part 11 and the first bit attachment device 20, so that when the bit attachment mechanism 2 attaches the bit 3, vacuum pressure is applied from between the bit 3 and the first outer member 22. Prevents leakage to the outside.

The bit storage device 4 has a plurality of through holes 41 (only one is shown in the drawing) depending on the number of bits to be used.
A block 42 having a block 42, a cylinder 43 provided inside the block 42 so as to be movable in the vertical direction;
A piston 44 is provided to be movable in the vertical direction with respect to a cylinder 43 installed inside the piston 4;
4. It consists of a second bit removal device 60 which is placed above C.4.

The cylinder 43 is connected to the piston 44 via a spring 45.
The piston 44 is connected to the piston 44 and is always urged upwardly.
The piston 44 is connected to the block 42 via a spring 46 and is always urged downwardly with respect to the block 42.

A passage 2847 for supplying air pressure is provided at the bottom of the block 42, and when air pressure is supplied from this passage, the piston 4
4 and the cylinder 43 rise, and when the supply of air pressure is stopped, the piston 44 descends due to the force of the tin 1 nong 46.

An opening 48 on the top surface of the cylinder 43 allows the bit 3 to pass through.
is provided. The diameter of this opening 48 is 1 unit within the first
It is larger than the outer diameter of the member 21 and smaller than the outer diameter of the first outer member 22.

A bolt 49 embedded below the cylinder 43 passes through an elongated hole 50 on the outer periphery of the piston 44, and also extends through the block 4.
A bolt 51 is embedded above 2. bolt 4
9 and the bolt 51 come into contact with each other, the bolt 43
The upward movement of the cylinder 4 of the piston 44 is stopped, and the bolt 49 and the upper and lower ends of the elongated hole 50 come into contact with each other, so that the cylinder 4 of the piston 44
The upper and lower I<ff fields of relative motion with respect to 3 are defined.

The second bit removal device 60 includes a hollow cylindrical outer member (second outer member) 61 that moves together with the piston 44, and a hollow cylindrical inner member surrounded by the outer member 61 (a hollow cylindrical inner member surrounded by the outer member 61).
It consists of a second inner member) 62, and a sphere (second sphere) 63. The inner member 62 and the outer member 61 form a second sphere 63
This constitutes a means for causing the bit 3 to engage with the second groove portion 36 of the bit 3.

The inner member 62 has a tin 1 provided between it and the piston 44.
It is always urged upwardly against the piston 44 via the tongue 64. The inner member 62 is provided with a plurality of (for example, 41) through holes (second through holes) 65 that penetrate in the horizontal direction. A sphere 63 is loosely fitted into this through hole 65, and its inner diameter is equal to the outer tlJ (outer member 22 teJ
) is slightly larger than the diameter of the sphere 63, and the inner side is slightly smaller, so that the sphere 63 can be transferred to the outside. Outside 1 [
The 11J member 61 has a protrusion (second protrusion) 66 on the inside, and is in the position shown in FIG. 1 (predetermined position) in the normal state.
The sphere 63 in the through hole 65 is pushed inward by the protrusion 66 of the niobium.

A slope member 67 is provided surrounded by the inner member 62, and this buffer member 67 is connected to the piston 44 via a spring 68.
is connected to the top surface of the

The four bolts normally abut against the upper end of the elongate 50 of the piston 44, and the outer member 61 and the inner member 62 are spaced downward from the upper surface of the cylinder 43 (FIG. 1C).

Next, the operation of attaching the bit 3 to the bit removal mechanism 2 according to an embodiment of the present invention will be explained based on FIGS. 2A to 2F. In addition, in FIG. 2, the cylindrical member 15 and the outer member 22 of the first attachment/detachment device 20 are depicted as being integral, and the seal 19 and the cylindrical member 15 are
The fitting groove 35 for the bottle 17 and the bit 3 extending inside the drawing is omitted.

(1) First, the bit attaching mechanism 2 is moved onto the bit storage device 4 and then lowered. At this time, in the second attachment/detachment device 60, the inner member 62 is urged upward by the sub-nong 64, and the inner member 62 is relatively pushed outward. IJ member 61 is inner member 6
2 [2] are in a predetermined position opposite each other, and the protrusion 66 pushes the second sphere 63 inward. Therefore, the bit 3 is firmly held by the second attachment/detachment device 20.

Also, did you tell Shi1nonda43? LtT bolt 49 (
The piston 44 is in contact with the lower end of the elongated hole 50.

Note that in the first attachment/detachment device 20, the outer 91 member 22
is urged downward by the spring 24, and the outer member 22
is in a predetermined position relative to the inner member 21, and the protrusion 27
is pushing the first sphere 23 inward (Fig. 2A)
.

After the bit attachment mechanism 2 has descended to a predetermined height, air pressure is supplied through the passage 2847 at the bottom of the flock 42 to raise the cylinder 43 and piston 44. At this time, the bolt 49 provided on the cylinder 43 is
The piston 44 rises together with the cylinder 43 until it comes into contact with a bolt 51 provided on the piston 2 and stops. When the cylinder 43 rises, the inner member 21 of the first attachment/detachment device 20 descends against the force of the spring 24 until the collar 26 comes into contact with the upper end of the outer member 22.
The protrusion 27 of the bit 2 comes off the ball 23 and is inserted into the groove 3 of the bit 3.
2 and the sphere 23 are also disengaged (Fig. 2B).

■Then, the cylinder 43 remains stationary until the bolt 49 comes into contact with the lower end of the elongated part 50 of the piston 44.
4 rises. At this time, the upper end of the inner member 62 comes into contact with the cylinder 43 and the outer member 61 rises, so that the protrusion 66 of the outer member 61 comes off the sphere 63 and connects the groove 32 of the bit 3 with the sphere 63. The mesh will also disengage (Fig. 2C).

■Next, when the bit attachment mechanism 2 is raised, the inner member 21 of the first attachment/detachment device 20 is removed from the flange 26 (outer f!ll).
The sphere 2 separates from the upper end of the J member 22 and returns to its normal state.
3 is pushed into the groove 32 of the bit 3 by the projection 27, and the bit 3 is firmly held by the bit attachment mechanism 2 (FIG. 2D).

(2) Stop the supply of air pressure from the passage 2847 at the bottom of the block 42. The piston 44 is lowered by the force of the spring 46 until the bolt 49 provided on the bolt 43 comes into contact with the lower end of the elongated hole 50 of the piston 44 (Fig. 2E).
.

After the bolt 49 contacts the lower end of the elongated hole 50, the piston 4
4, the cylinder 43 also descends and returns to its original position of 1.

Next, the operation when removing the bit 3 from the bit attachment mechanism 2 according to an embodiment of the present invention will be explained based on FIGS. 3A to 3F.

(1) First, the bit attaching mechanism 2 is moved onto the bit storage device 4 and lowered. At this stage, as in the stage of FIG. 2A, the first desorption device 20 and the second desorption device 6
0, the protrusion 27°66 is connected to the first and second spheres 2
6, 63 are pushed inside. Therefore, the bit 3 is firmly held by the second attachment/detachment device 60.

(Figure 3A).

After the bit attachment mechanism 2 has descended to a predetermined height, air pressure is supplied from the passage 2847 at the bottom of the block 42 to raise the cylinder 43 and piston 44, as shown in FIG. 2B. At this time, the piston 44 rises together with the cylinder 43 until the bolt 49 provided on the cylinder 43 comes into contact with the bolt 51 provided on the block 42 and stops. When the cylinder 43 rises, the inner member 21 of the first detachable device τ20 descends against the force of the spring 24 until the collar 26 comes into contact with the upper end of the outer member 22.

Therefore, the projection 27 of the outer member 22 comes off the sphere 23, and the groove 32 of the bit 3 and the sphere 23 also come out of engagement (FIG. 3B).

■Then, the cylinder 43 remains stationary until the four bolts come into contact with the lower end of the elongated hole 50 of the piston 44.
4 rises. At this time, even after the upper end of the inner member 62 comes into contact with the cylinder 43 and stops, the outer member 61 rises, so the protrusion 66 of the outer member 61 comes off the sphere 63 and the groove 32 of the bit 3 and the sphere 63 are separated. It also comes out of engagement. At this time, springs 64 and 68 are compressed (FIG. 3C).

(2) Then, the supply of air pressure from the passage 2847 at the bottom of the block 42 is stopped. Bolt 4 installed in cylinder 43
The force of the spring 46 causes the piston 44 to descend until it abuts against the upper end of the elongated portion 50 of the piston 44. At this time, the compressed springs 64 and 68 return to their normal state and expand, so the sphere 63 is pushed inward by the protrusion 66 of the outer member 61 and engages with the groove 32 of the bit 3.
Fix bit 3 (Figure 3D).

(2) After the bolt 49 comes into contact with the upper end of the elongated hole 50, the seaming 43 also descends together with the piston 44 and moves to the original position I. In addition, the bit attachment mechanism 2 is raised almost simultaneously with the stop of the supply of air pressure from the passage 47 mentioned in (■).
Figure 3E).

Effects of the Invention According to the bit mounting CA mechanism and the bit exchange device of the present invention, there is no need to increase the vertical stroke of the carrier 10 for mounting chip parts, so it is different from the bit of a conventional chip mounter. Impact force between chip components can be reduced.

Further, the bit attachment mechanism and bit exchange device of the present invention [
Accordingly, the carrier and the bit can be strongly connected.

[Brief explanation of the drawing]

1A, 1B, and 1C are sectional views showing a bit mounting mechanism, a bit, and a bit storage device according to an embodiment of the present invention, and FIGS. 2A to 2E are sectional views of a bit mounting mechanism, a bit, and a bit storage device according to an embodiment of the present invention 3A to 3E are cross-sectional views showing the process of attaching the bit to the bit removal mechanism using the present invention. The figure is a perspective view showing a conventional bit exchange device. 2...Bit attachment mechanism, 3...Bit, 4...
・Bit storage device τ, 10...conveyor, 20...first
attachment/detachment device, 21, 22...means for biting stand (21
...first inner member, 22...first outer member),
23...first sphere, 25...first through hole, 27
...first protrusion, 32...first groove, 36...
-Second groove, 60...Second attachment/detachment device, 61, 62
...Meaning for biting stand (61...outer member, 62...
... second inner member), 63 ... second sphere, 65.
...Second through hole, 66...Second protrusion.

Claims (4)

[Claims] (1) A bit having a first groove and capable of sucking a chip component, a conveying body movable in the XY directions, and a first bit detaching device provided at the lower end of the conveying body, The first attachment/detachment device is a bit attachment mechanism for a chip mounter having a first sphere and a first means for causing the first sphere to engage with a first groove of the bit. (2) The first means for making the bit stand includes a first inner member that surrounds the bit and has a first through hole into which the first sphere is loosely fitted, and a first inner member that surrounds the bit. The first outer member is provided to be movable in the vertical direction and has a first protrusion, and when the first outer member is in a predetermined position with respect to the first inner member, the first outer member 2. The bit attachment mechanism for a chip mounter according to claim 1, wherein the projection pushes the first sphere inward to engage the first sphere with the first groove of the bit, thereby fixing the bit. (3) The bit attachment mechanism according to claim 1, wherein the bit further has a second groove, a storage device for storing a replacement bit, and a second bit removal device provided at an upper part of the storage device. and the second detachment device includes a second detachment device.
A bit changing mechanism for a chip mounter, comprising: a spherical body; and second means for causing the second spherical body to engage a second groove portion of the bit. (4) The second means for making the bit stand includes a second inner member that surrounds the bit and has a second through hole into which the second sphere is loosely fitted, and a second inner member that surrounds the bit. The second outer member is provided to be movable in the vertical direction and has a second protrusion, and when the second outer member is in a predetermined position with respect to the first inner member, the second outer member 4. The bit exchange mechanism for a chip mounter according to claim 3, wherein the projection pushes the second sphere inward to cause the second sphere to engage the second groove of the bit, thereby fixing the bit.