JP3115958B2 - Nozzle changing device in mounting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting apparatus for mounting a chip component such as an IC on a printed circuit board by a head unit having a nozzle member for picking up a chip component. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, a nozzle member for picking up chip components is provided on a head unit movably mounted above a base so as to be able to move up and down. 2. Description of the Related Art A mounting machine in which a unit is moved onto a printed circuit board and a chip component is mounted on the board is generally known. In this mounting machine, the nozzle member includes a nozzle at a lower end portion of a hollow nozzle shaft, and a negative pressure is guided into the nozzle shaft from a negative pressure supply source via a valve or the like, and acts on the nozzle. By doing so, chip components can be sucked.

The nozzle at the lower end of the nozzle member is detachably attached to the nozzle shaft so that it can be replaced with a nozzle having a different size and shape depending on the type of chip component.

In such a mounting machine, a nozzle replacement station is installed at an appropriate place on the base,
The nozzle replacement station is provided with a nozzle holding portion having a plurality of nozzle storage holes. During nozzle replacement, the nozzle is detached from the nozzle member of the head unit while the head unit is positioned above the nozzle replacement station. There is a nozzle replacement device in which a nozzle is housed in a nozzle housing hole of the nozzle holding unit, and then a nozzle taken out from another housing hole is mounted on a head unit.

[0005]

In the conventional nozzle changing apparatus, a nozzle changing station is provided with a clamp means for clamping a nozzle in a nozzle accommodating hole, and the clamp means is switched between a clamp state and a clamp release state. The actuator of the present invention is used to remove the nozzle from the head unit and store it in the nozzle storage hole, and to remove the nozzle from the nozzle storage hole of the nozzle replacement station and attach it to the head unit. It was working. In other words, the case of removing the nozzle from the head unit will be described. First, after the clamp unit is operated by the actuator in the unclamped state, the nozzle member of the head unit is lowered, and the nozzle is inserted into the nozzle receiving hole. The nozzle member is operated in a clamped state, and then the nozzle shaft of the nozzle member is pulled up to separate the nozzle member from the nozzle shaft.

However, in such an apparatus, the operation to the above-described clamp release state, the lowering of the nozzle member, the operation to the clamp state, and the raising of the nozzle member are sequentially performed, so that a complicated operation or complicated operation is required. There was a problem that control was required and work efficiency was poor.

The present invention has been made in view of the above circumstances, and has as its object to provide a nozzle exchanging apparatus in a mounting machine that can easily and efficiently perform an operation of removing a nozzle from a head unit and housing the nozzle in a nozzle housing hole. Aim.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a head unit movably mounted above a base for adsorbing a chip component having a nozzle at a lower end of a hollow shaft. The nozzle unit is provided so as to be able to move up and down, and the head unit carries the chip component from the component supply side to the component mounting side, and a nozzle replacement station is installed at a predetermined position on the base, and the nozzle replacement station is provided. In a mounting machine provided with a nozzle holding portion having a plurality of nozzle storage holes, the nozzle is attached to the shaft so as to be detachable in response to an external force, while the nozzle holding portion of the nozzle replacement station is A clamp plate having a plurality of nozzle insertion holes is provided at an upper portion, and the clamp plate is arranged such that each nozzle insertion hole is opposed to each of the nozzle storage holes. And a biasing means for biasing the clamp plate to the clamp position is provided in the nozzle replacement unit so as to be movable over a clamp position shifted by a predetermined amount and a clamp release position where each nozzle insertion hole matches each nozzle storage hole. A protrusion for clamping is provided on the outer periphery of the intermediate portion of the nozzle, and the protrusion passes through the nozzle insertion hole while pushing the clamp plate to the clamp release position when the nozzle is inserted into the nozzle housing hole. In addition, an inclined surface is formed on at least one of the peripheral portion of the nozzle insertion hole and the protruding portion.

[0009]

According to the above arrangement, when removing the nozzle at the tip of the nozzle member of the head unit and holding the nozzle at the nozzle holding section of the nozzle replacement station, the nozzle member is positioned above the nozzle replacement station. By lowering the nozzle, the protrusion of the nozzle pushes the clamp plate to the clamp release position and passes through the nozzle insertion hole, and after that, the clamp plate automatically becomes the clamp position by the urging force of the urging means. Then, when the nozzle member rises, the nozzle separates from the shaft and is housed in the nozzle housing hole.

[0010]

An embodiment of the present invention will be described with reference to the drawings.
1 and 2 show the structure of the entire mounting machine according to one embodiment of the present invention. In these figures, a conveyor 2 for transporting a printed board is arranged on a base 1, and a printed board 3 is transported on the conveyor 2 and stopped at a predetermined mounting work position. . Component supply units 4 are arranged on both sides of the conveyor 2. Also,
Above the base 1, a head unit 5 is mounted. Further, a nozzle replacement station 30 is provided at a predetermined location on the base 1.

The component supply unit 4 includes a plurality of rows of tape feeders 4a.
Chip-shaped chip components such as ICs are stored and held at predetermined intervals in a tape led out from a reel, and the chip components are sequentially supplied as the head unit 5 picks up the chip components.

The head unit 5 can move in the X-axis direction (the direction of the conveyor 2) and the Y-axis direction (the direction orthogonal to the X axis on a horizontal plane). That is, a pair of fixed rails 7 extending in the Y-axis direction and a ball screw shaft 8 driven to rotate by a Y-axis servomotor 9 are disposed on the base 1, and a head unit is mounted on the fixed rail 7. A support member 11 is provided, and a nut portion 12 provided on the support member 11 is screwed to the ball screw shaft 8. A guide member 13 extending in the X-axis direction and a ball screw shaft 14 driven by an X-axis servomotor 15 are disposed on the support member 11 so that the head unit 5 can move on the guide member 13. A nut portion (not shown) provided in the head unit 5 is screwed to the ball screw shaft 14. The ball screw shaft 8 is rotated by the operation of the Y-axis servo motor 9 to move the support member 11 in the Y-axis direction, and the ball screw shaft 14 is rotated by the operation of the X-axis servo motor 15, thereby causing the head unit to rotate. 5 is the support member 1
1 is moved in the X-axis direction.

The head unit 5 is provided with a nozzle member 20 for adsorbing chip components. In the illustrated embodiment, three nozzle members 20 are provided. Each nozzle member 20
Can move up and down (movement in the Z-axis direction) and rotate around the nozzle center axis (R-axis) with respect to the frame of the head unit 5, respectively, and are operated by a Z-axis servomotor 17 and an R-axis servomotor 18. It has become so.

FIG. 3 shows a specific structure of the nozzle member 20. In this figure, a nozzle member 20 includes a spline shaft 21 and a collar 2 press-fitted in a lower portion thereof.
2 and the nozzle shaft 24 inserted in the collar 22
And a nozzle 25 attached to the tip of the nozzle shaft 24. The spline shaft 21 is connected to the Z-axis, R
The shaft servomotors 17 and 18 are connected. Also, a detent pin 24a provided on the nozzle shaft 24 is provided.
Engages with a long hole 22 a formed in the collar 22 and has a nozzle shaft 2 inside the spline shaft 21.
By providing a compression spring 26 that elastically presses the nozzle 4 downward, the nozzle 4 is coupled to the nozzle shaft 24 with an appropriate cushioning property.

The spline shaft and the nozzle shaft are formed in a hollow shape, and a passage 27 for introducing a negative pressure is formed between the spline shaft and the nozzle shaft. The passage 27 is connected to a negative pressure supply source (not shown) via a valve or the like. It has become so.

The nozzle 25 is fitted to the nozzle shaft 24, and the upper edge 25a is elastically held by a pair of leaf springs 28 attached to the nozzle shaft 24. When an external force greater than the holding force acts in the nozzle withdrawing direction, it is separated from the nozzle shaft 24.

A flange-like projection 29 for clamping is provided on the outer peripheral surface of the middle part of the nozzle 25.

FIGS. 4 to 6 show the nozzle changing station 3.
0 is shown. In these figures, the nozzle replacement station 30 has a plurality of nozzle storage holes 3 for storing and holding various nozzles 25 having different sizes and shapes.
2 is provided, and a clamp plate 33 is provided on the upper surface side of the nozzle holding unit 31. The clamp plate 33 includes the nozzle housing holes 3
A plurality of nozzle insertion holes 34 corresponding to 2 are provided. The clamp plate 33 moves between a clamp position in which each nozzle insertion hole 34 is displaced by a fixed amount with respect to each nozzle storage hole 32 and a clamp release position in which each nozzle insertion hole 34 matches each nozzle storage hole 32. It is connected via a guide 35 as possible. A wall plate 36 protruding downward is connected to one end of the clamp plate 33, and a shaft 37 connected to a large-diameter portion 42 of a rod 41 to be described later penetrates the wall plate 36. A spring 38 is provided between the wall plate 36 and the wall plate 36 as urging means. The spring 38 biases the clamp plate 33 to the clamp position. And the nozzle storage hole 3
When the nozzle 25 is stored in the clamp plate 2 and the clamp plate 33 is in the clamp position, a part of the clamp plate 33 around the nozzle insertion hole 34 is
(See FIG. 9).

Also, the peripheral portion of the nozzle insertion hole 34 is moved so that the projection 29 pushes the clamp plate 33 to the clamp release position and passes through the nozzle insertion hole 34 when the nozzle is inserted into the nozzle storage hole 32. Is formed with a tapered inclined surface 39 extending upward.

Further, the nozzle exchange station 30 is provided with an air cylinder 40 for moving the clamp plate 33 to the clamp release position when removing the nozzle 25 from the nozzle storage hole 32. The air cylinder 40 is operated by the air cylinder 40. A large-diameter portion 42 provided on the rod 41 is in contact with the wall plate 36.

According to the nozzle exchanging apparatus of the present embodiment as described above, the nozzle removing operation (exchanging the nozzle 25 from the head unit 5 and holding the nozzle 25 in the nozzle holding unit 31 of the nozzle exchanging station 30) at the time of exchanging the nozzle is performed. 7 to 9 can be easily performed.

That is, first, the nozzle exchange station 3
0, the head unit 5 is moved upward, and then the nozzle member 20 is lowered.
5 is inserted into a predetermined nozzle housing hole 32 of the nozzle holding unit 31. In this case, during the insertion, the protrusion 29
Abuts a part of the periphery of the nozzle insertion hole 34 of the clamp plate 33, but the periphery of the nozzle insertion hole 34
As a result, the protrusion 29 slides on the inclined surface 39 and passes through the nozzle insertion hole 34 while pushing the clamp plate 33 to the clamp release position. When the protrusion 29 reaches the inside of the nozzle housing hole 32 below the nozzle insertion hole 34, the clamp plate 33 returns to the clamp position by the urging force of the spring 38. If the nozzle member 20 is lowered and then the nozzle member 20 is raised until this state is reached, the nozzle 25 is separated from the nozzle shaft 24 because the clamp plate 33 prevents the nozzle 25 from being pulled out. And is left in the nozzle housing hole 32.

Thus, the nozzle 25 can be easily and efficiently removed simply by lowering and raising the nozzle member 20 by the Z-axis servomotor 17.

The nozzle mounting operation (the operation of taking out the nozzle 25 from the nozzle holding portion 31 of the nozzle replacement station 30 and mounting it on the head unit 5) is performed as shown in FIG. That is, the upper part of the nozzle 25 is connected to the nozzle shaft 24 by operating the clamp plate 33 to the clamp release position with the air cylinder 40 and lowering the portion other than the nozzle 25 of the nozzle member 20. Then, the nozzle member 20 including the nozzle 25 may be raised.

In this embodiment, the movable amount of the nozzle member 20 in the descending direction with respect to the head unit 5 is set to be larger than the stroke required for sucking and mounting the chip components, and Numeral 31 simplifies the structure by preventing vertical movement. In other words, in this type of conventional apparatus, the nozzle member can be lowered to a position where the component can be sucked from the component supply unit and the component can be mounted on the printed board, while the nozzle holding unit of the nozzle replacement station can be moved. , Usually in the lowered position so as not to interfere with component mounting work,
Although the nozzle is raised when the nozzle is replaced, a mechanism for raising and lowering the nozzle is required, and the structure is complicated. Therefore, in the present embodiment, the nozzle holding section 31 of the nozzle replacement station 30 is fixedly provided at a relatively low position so as not to hinder the component mounting operation. By lowering the nozzle 25 more than that, the storage and removal of the nozzle 25 with respect to the nozzle holding unit 31 are enabled.

The specific structure of the nozzle replacement device is not limited to the above embodiment, but can be variously changed. For example, in the above embodiment, in order to allow the protrusion 29 to pass through the nozzle insertion hole 34 while pushing the clamp plate 33 to the clamp release position when the nozzle is inserted into the nozzle storage hole 32. Although the inclined surface 39 is formed around the nozzle insertion hole 34, the lower surface of the protruding portion 29 of the nozzle 25 may be formed as the inclined surface.

Further, in addition to the structure described above, if the rotation angle of the nozzle 25 with respect to the nozzle shaft 24 is deviated at the time of replacing the nozzle, the holding of the nozzle by the leaf spring 28 is hindered. Further, when a nozzle of a different type is erroneously stored in the nozzle storage hole 32 in which the nozzle 25 to be mounted is supposed to be stored when the nozzle is mounted on the head unit 5, 25 mistakes occur. Therefore, as shown in FIGS. 11 and 12, a positioning section for positioning the nozzle in the rotation direction is provided by the nozzle holding section 31 of the nozzle replacement station 30, and the above-mentioned positioning section is used to reliably prevent the error. It is desirable. That is, in these figures, in each of the nozzle holding holes 32 of the nozzle holding portion 31,
A pair of positioning pins 51 are provided around the nozzles A and 32B, and a pair of cutouts corresponding to the positioning pins 51 are provided on the protruding portions 29 of the nozzles 25A and 25B to be stored in the nozzle storage holes 32A and 32B. A notch 52 is provided, and the nozzles 25A and 25B are
32B, the notch 52 is positioned on the positioning pin 51.
Is adapted to be engaged. Further, since the positional relationship between the pair of positioning pins 51 (and the pair of notches 52) is different between the respective nozzle storage holes 32A and 32B (the respective nozzles 25A and 25B), the positioning pins 51 are stored in the nozzle storage holes 32A and 32B. When a different type of nozzle from the nozzle to be stored is to be stored, the positioning pin 51 and the notch 52 do not correspond to each other, so that the storage is prevented.

The shape of the suction hole at the tip of each nozzle may be a circular shape as conventionally known. In particular, as shown in FIG.
If a plurality of rows of elongated suction holes 61 are formed, the following advantages are obtained as compared with a circular suction hole. That is, in the case of the circular suction hole, when the chip component is sucked, the corners of the chip component are fitted into the suction hole, so that an abnormal suction state in which a so-called component stands may occur, whereas the suction hole 61
If the thickness is reduced, the standing of the parts is prevented. Further, even if the area is the same as that of the circular suction hole, the suction force is applied to a position far from the center and the suction moment force is increased, so that the chip component can be prevented from shifting in the rotational direction.
Further, the number of types of chip components that can be suctioned by the same nozzle increases, and the frequency of nozzle replacement decreases, thereby contributing to an improvement in work efficiency.

[0029]

As described above, according to the nozzle replacement device of the present invention, the nozzle at the tip of the nozzle member provided in the head unit can be detached in accordance with an external force, while the nozzle holding portion of the nozzle replacement station can be detached. Above, a biasing means for enabling a clamp plate having a plurality of nozzle insertion holes to be movable between a clamp position and a clamp release position and biasing the clamp plate to the clamp position is provided, and a nozzle is inserted into the nozzle housing hole. At times, the protruding portion of the nozzle to be clamped passes through the nozzle insertion hole while pushing the clamp plate to the clamp release position. Therefore, the work of removing the nozzle from the head unit and housing it in the nozzle housing hole at the time of nozzle replacement can be performed simply and efficiently only by lowering and raising the nozzle member.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a mounting machine provided with a nozzle replacement device according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the mounting machine.

FIG. 3 is a sectional view of a nozzle member.

FIG. 4 is a plan view of a nozzle replacement station.

FIG. 5 is a front view of a nozzle replacement station.

FIG. 6 is a partial cross-sectional side view of a nozzle replacement station.

FIG. 7 shows a first example of a nozzle removing operation from the head unit.
It is explanatory drawing which shows the stage.

FIG. 8 is an explanatory diagram showing a second stage of the nozzle removal operation.

FIG. 9 is an explanatory diagram showing a third stage of the nozzle removal operation.

FIG. 10 is an explanatory diagram illustrating a work of mounting a nozzle to a head unit.

FIG. 11 is an enlarged plan view of a main part showing an example of a structure in which a nozzle positioning portion is provided for a component storage hole.

FIG. 12 is a sectional view taken along the line XII-XII of FIG. 11;

FIG. 13 is an enlarged view showing an example of the shape of a suction hole at the tip of a nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 5 Head unit 20 Nozzle member 24 Nozzle shaft 25 Nozzle 29 Projection part 30 Nozzle exchange station 31 Nozzle holding part 32 Nozzle storage hole 33 Clamp plate 34 Nozzle insertion hole 38 Spring (biasing means) 39 Inclined surface

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H05K 13/04

Claims (1)

(57) [Claims] A head unit movably mounted above a base is provided with a nozzle member for picking up chip components having a nozzle at a lower end of a hollow shaft so as to be able to move up and down, and the head unit is used to pick up chip components. A configuration in which the component is transported from the component supply side to the component mounting side, a nozzle replacement station is installed at a predetermined location on the base, and the nozzle replacement station is provided with a nozzle holding unit having a plurality of nozzle storage holes. In the machine, the nozzle is attached to the shaft so as to be detachable in response to an external force, while a clamp plate having a plurality of nozzle insertion holes is provided above the nozzle holding portion of the nozzle replacement station. Position the clamp plate at the clamp position where each nozzle insertion hole is deviated by a certain amount with respect to each of the nozzle storage holes. A biasing means for biasing the clamp plate to the clamp position is provided in the nozzle replacement unit so as to be movable over a clamp release position corresponding to the nozzle housing hole, and a protrusion for clamping is provided on the outer periphery of the intermediate portion of the nozzle. A peripheral portion of the nozzle insertion hole and the projection portion so that the projection portion passes through the nozzle insertion hole while pushing the clamp plate to the clamp release position when the nozzle is inserted into the nozzle storage hole. A nozzle changing device in a mounting machine, wherein an inclined surface is formed on at least one side.