JP2000124680A - Chucking nozzle changing device for surface-mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contribute to a tack time for shortening while a chucking nozzle which is used by a plurality of chucking nozzle being equipped with a head being changed. SOLUTION: This device is comprised of a nozzle assembling block 30 which is provided with a plurality of chucking nozzles 26 to 28 at the lower part of the nozzle shafts and which is so assembled at to be able to rotate and deviate around the lateral axis, a first bevel gear 56, which is provided to gear with a second bevel gear 57 which is provided with the nozzle assembling block 30 and the nozzle assembling block 30 is made to rotate and deviate according to a rotation of the nozzle shaft 25, by preventing the first bevel gear 56 from rotating. Additionally a control means for so controlling the restricting position around the vertical axis of the first bevel gear 56 at rotation of the first bevel gear 56 which is obstructed as the chucking nozzle 26 to 28 to be set at a predetermined rotating angle of the vertical axis rotation after the change, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for changing a suction nozzle in a surface mounter, and more particularly to a suction nozzle changing device in a surface mounter capable of selectively using a plurality of types of suction nozzles attached to a head. .

[0002]

2. Description of the Related Art Heretofore, a head unit that can move between a component supply unit and a printed circuit board positioned at a predetermined working position is provided with a component suction head so as to be able to move up and down and rotate. 2. Description of the Related Art A surface mounter is generally known in which an electronic component is sucked by an attached suction nozzle, and a component is mounted by sucking a component from a component supply unit and then moving a head unit onto a printed circuit board.

In this type of surface mounter, the suction nozzle can be changed according to the type of a component to be suctioned. Generally, a suction nozzle is provided at a nozzle replacement station provided on a side of a component supply unit. A plurality of suction nozzles are exchangeably held, and the head unit is moved to this station as needed to replace the suction nozzles.

[0004] However, it is inefficient to move to the station one by one to replace the suction nozzle for replacement of the suction nozzle. Therefore, the applicant of the present application mounts a nozzle assembly block in which a plurality of suction nozzles are radially arranged on a head, and mounts the nozzle assembly block so as to be rotatable about a horizontal axis, and rotates the nozzle assembly block to obtain a type of component. Has proposed a surface mounter that can selectively set a suction nozzle at a predetermined use position in accordance with, for example, (Japanese Patent Application 1998)
No. 205585).

In this device, a head is constituted by providing the nozzle assembling block below a nozzle shaft which is driven to rotate about a vertical axis, and the nozzle shaft and the nozzle assembling block are vertically integrated. It is possible to switch between a driving state for mounting that rotates around the axis and a driving state for changing the nozzle that rotates and displaces the nozzle assembly block about a horizontal axis in accordance with the rotation of the nozzle shaft.

More specifically, in the above apparatus, a first bevel gear rotatable around the longitudinal axis is provided below the nozzle shaft, while the first bevel gear is provided on the nozzle assembly block.
A second bevel gear meshing with the bevel gear is provided;
The state can be switched between a state in which the rotation of the bevel gear is blocked and a state in which the rotation is allowed. In a state where the rotation of the first bevel gear is permitted, both the bevel gear and the nozzle assembly block can rotate integrally with the nozzle shaft around the longitudinal axis, and in a state where the rotation of the first bevel gear is prevented, the nozzle shaft In response to the rotation of the second bevel gear, the second bevel gear revolves around the vertical axis and rotates about the horizontal axis, so that the nozzle assembly block is rotated and displaced about the horizontal axis to change the suction nozzle. Has become.

[0007]

However, in the above device, when the rotation of the first bevel gear is stopped,
As the second bevel gear revolves, the nozzle assembly block rotates relative to the first bevel gear integrally with the first bevel gear, so that when a component is sucked, the rotation angle of the suction nozzle about the vertical axis is set to a predetermined angle. It may be necessary to correct the reference rotation angle.

That is, in this type of mounting machine, a process of examining a shift of the suction component around the vertical axis with respect to the suction nozzle is performed based on an image of the suction component and the like, and the component is mounted in consideration of the shift. In general, in order to facilitate the processing, the suction of the component is performed in a state where the suction nozzle is set at a predetermined reference rotation angle. However, in the above-described conventional apparatus, the nozzle assembly block itself rotates around the vertical axis when the suction nozzle is changed, so that the suction nozzle after the change is often not at the reference rotation angle, so that the suction nozzle is set at the predetermined reference angle. It is necessary to suck components after resetting.

However, it is not preferable to correct the rotation angle of the suction nozzle every time the suction nozzle is changed in order to shorten the tact time, and there is room for improvement in this point.

SUMMARY OF THE INVENTION The present invention has been made in view of these circumstances, and in a surface mounter in which a plurality of suction nozzles are changeably mounted on a head, a surface mounter which can contribute to a reduction in tact time. It is an object of the present invention to provide a suction nozzle changing device.

[0011]

In order to achieve the above object, the present invention provides a head unit including a nozzle shaft capable of moving up and down in a vertical direction and rotating about the vertical axis. In addition, a nozzle assembly block in which a plurality of suction nozzles are radially arranged is provided so as to be rotatable about a horizontal axis, and a first bevel gear rotatable about a vertical axis is provided. A state in which the first bevel gear is fixed to the frame of the head unit while the first bevel gear is engaged with the second bevel gear provided in the attached block, and both bevel gears and the nozzle assembly block rotate integrally with the nozzle shaft about the longitudinal axis. And the first bevel gear is fixed, so that the second bevel gear moves in the vertical axis in accordance with the rotation of the nozzle shaft. In a surface mounter that revolves around the horizontal axis while revolving around, and the nozzle assembly block rotates accordingly, the first bevel gear is attached to the frame of the head unit when the first bevel gear is fixed. Constraining means for restraining is provided, and the restraining means is configured so that the restraining position of the first bevel gear with respect to the frame can be changed, and control means for controlling the restraining position is provided. It is configured to set the restraint position based on the rotation angle of the nozzle assembly block around the vertical axis accompanying the suction nozzle change so that the nozzles are arranged at a predetermined reference rotation angle of the vertical axis times. (Claim 1).

In this surface mounter, when the nozzle shaft is rotated with the first bevel gear fixed to the frame, the second bevel gear revolves around the vertical axis and rotates about the horizontal axis. The suction nozzle is changed by rotating and displacing the nozzle assembly block about the horizontal axis. The first bevel gear is fixed so that the suction nozzle after the change is disposed at a predetermined reference rotation angle on the vertical axis. Is set, the suction nozzle is always arranged at a predetermined reference rotation angle after the suction nozzle is changed. Therefore, it is not necessary to correct the suction nozzle to a predetermined reference rotation angle after the change.

More specifically, both the bevel gear and the nozzle assembling block move up and down integrally with the nozzle shaft with respect to the frame of the head unit as the nozzle shaft moves up and down.
One engaging portion and a plurality of engaged portions are respectively provided on the bevel gear, and the engaging portion and one of the engaged portions mutually engage at a predetermined rising position of the nozzle shaft. To fix the first bevel gear, and the engaged portions are formed at predetermined intervals around the vertical axis based on the number of suction nozzles and the rotation angle of the nozzle assembly block about the vertical axis accompanying the change of the suction nozzle. The control means, when the suction nozzle is changed, from among the plurality of engaged portions, to check the engaged portion that can arrange the suction nozzle after the change at the reference rotation angle,
The rotation and elevation operations of the nozzle shaft are controlled so that the engaged portion and the engaging portion are engaged with each other (claim 2).

According to this structure, the nozzle shaft is displaced upward to the predetermined ascending position, and the first bevel gear is fixed by the frame and the first bevel gear being engaged with each other via the engaging portion and the engaged portion. Is done. At this time, among the plurality of engaged portions, an engaged portion capable of disposing the suction nozzle after the change at the reference rotation angle is selected, and the engaged portion is engaged with the engaging portion. The operation of the nozzle shaft is controlled. Thereby, the suction nozzle after the change is arranged at the predetermined reference rotation angle.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 schematically show the entire structure of a mounting machine when the apparatus of the present invention is applied to a surface mounting machine. In these figures, a base 1 of a mounting machine main body is shown.
On the top, a conveyor 2 for transporting a printed circuit board is arranged,
The printed board 3 is conveyed on the conveyor 2 and stopped at a predetermined board installation position. An electronic component supply unit 4 is arranged on the side of the conveyor 2. The electronic component supply unit 4 includes a feeder for supplying electronic components, for example, a multi-row tape feeder 4a.

A head unit 5 for mounting electronic components is provided above the base 1. The head unit 5 is movable across the electronic component supply unit 4 and the electronic component mounting unit where the printed circuit board 3 is located. In this embodiment, the head unit 5 is in the X-axis direction (the direction of the conveyor 2) and the Y-axis direction (in the horizontal plane). (A direction orthogonal to the X axis).

That is, a fixed rail 7 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. The support member 11 has X
An axial guide member 13 and a ball screw shaft 14 driven by an X-axis servomotor 15 are provided, and the head unit 5 is movably held by the guide member 13,
A nut portion (not shown) provided on the head unit 5 is screwed to the ball screw shaft 14. And
By the operation of the Y-axis servo motor 9, the support member 11
The head unit 5 moves in the X-axis direction with respect to the support member 11 by the operation of the X-axis servo motor 15 while moving in the axial direction.

The Y-axis servo motor 9 and the X-axis servo motor 15 are provided with encoders 10 and 16, respectively, so that the movement position of the head unit 5 can be detected.

Further, a head unit 5 is provided on the base 1.
An electronic component recognizing camera 17 for recognizing a suction state of the electronic component sucked by the head unit 5 is provided.
Is moved above the electronic component recognition camera 17 after the electronic component is picked up, so that the electronic component recognition camera 17 captures an image of the picked up electronic component.

FIGS. 2 to 4 show the structure of the head unit 5. In these figures, the head unit 5 is provided with a nozzle shaft provided with a suction nozzle at a lower portion, and in this embodiment, eight nozzle shafts 2 are provided.
0 ..., 25 ... are arranged. Half of the nozzle shafts 20 are provided with only one suction nozzle 21 at the lower part thereof, while the other half of the nozzle shafts 25 are selectively used at the lower part thereof. A plurality of possible suction nozzles, in this embodiment first to third
Are provided, and a nozzle shaft 20 provided with only one suction nozzle 21 and a nozzle shaft 25 provided with a plurality of suction nozzles 26 to 28 are alternately arranged. .

That is, the nozzle shafts 20...
25 is formed of a hollow pipe having a passage for introducing a negative pressure therein, and a suction nozzle is provided at a lower portion thereof, but a first group located at every other position from the right end side in FIG. The lower part of the four nozzle shafts 20 is provided with one suction nozzle 21 provided so as to communicate with the passage in the nozzle shaft 20, and the nozzle shaft 20 is provided in the housing formed in the head unit 5. 5a, it is held rotatably and rotatably. On the other hand, four nozzle shafts 25 of a second group located at every other position from the left end side in FIG. 2 are also held rotatably and rotatably by the housing 5a. A nozzle assembling block 30 (see FIG. 6) is provided, and a plurality of suction nozzles are attached to the nozzle assembling block 30. In the illustrated example, first to third three suction nozzles 26 to 28 are provided. Has been assembled.

The nozzle assembling block 30 can move up and down and rotate integrally with the nozzle shaft 25, and can be displaced relative to the nozzle shaft 25. In the illustrated embodiment, the nozzle assembling block 30 can be turned around the horizontal axis. The suction nozzle 26 is attached to the nozzle assembly block 30 so that one of the suction nozzles 26 to 28 is selectively communicated with the negative pressure passage in the nozzle shaft 25 by the rotational displacement. 26 to 28 are arranged radially.

The head unit 5 further includes a Z-axis drive mechanism for raising and lowering the nozzle shafts 20, 25, an R-axis drive mechanism for rotating the nozzle shafts 20, 25,
A negative pressure supply system or the like for supplying a negative pressure for component suction to a passage in each of the nozzle shafts 20 and 25 is provided.

The above-mentioned Z-axis driving mechanism includes a nozzle shaft 2
Air cylinders 31 and 33 are provided for each nozzle shaft so that 0 and 25 can be individually raised and lowered. Among them, the air cylinder 31 provided for each nozzle shaft 20 of the first group has one piston 32 inside, and pressure chambers 31a and 31b are formed on the upper and lower sides of the piston 32. The pressure chambers 31a and 31b are connected to a passage (not shown) of an air supply / discharge system, and the piston 32 is connected to the nozzle shaft 20 via a sleeve or the like. The nozzle shaft 20 is raised and lowered by a predetermined stroke by raising and lowering the piston 32 in response to controlling the supply and discharge of air to and from the pressure chambers 31a and 31b by a switching valve (not shown).

The air cylinder 33 provided for each nozzle shaft 25 of the second group can operate a switching mechanism, which will be described later, in addition to the operation of raising and lowering the nozzle shaft 25 for sucking and mounting components. , Two-stage strokes are possible. That is, inside the air cylinder 33, a main piston 34 connected to the nozzle shaft 25 via a sleeve or the like and an auxiliary piston 35 located above the main piston 34 are provided, and the upper side of the main piston 34 (pistons 34, 35) is provided. The pressure chambers 33a, 33b, and 33c are formed on the lower side and on the upper side of the auxiliary piston 35, and the supply and discharge of air to and from the pressure chambers 33a, 33b, and 33c are controlled by a switching valve (not shown). Has become.

Then, air is supplied to the upper pressure chamber 33c of the auxiliary piston 35 and the upper and lower pressure chambers 33a, 33b of the main piston 34 are held in a state where the auxiliary piston 35 is held at a predetermined position (position shown). When the supply and discharge of air is controlled, the main piston 34 and the nozzle shaft 25 connected thereto are moved up and down by a predetermined normal stroke, and air is discharged from the upper pressure chamber 33 c of the auxiliary piston 35. When air is supplied to the lower pressure chamber 33b of the main piston 34, the auxiliary piston 35
As a result, the main piston 34 and the nozzle shaft 25 connected thereto are further raised from the rising end position of the normal stroke. The position where the nozzle shaft 25 is further raised from the rising end position of the normal stroke is called an upper position, and the rising position and the lowering position in the normal stroke are called a middle position and a lower position, respectively.

The R-axis drive mechanism includes an R-axis servo motor 36 mounted at the lower end of one end of the head unit.
A drive shaft 37 interlocked with the servo motor 36 via a speed reduction mechanism including pulleys 37a and 37b and a belt 37c. A pulley (not shown) provided on the drive shaft 37 and each of the heads 20 and 25 A rotation transmission belt (not shown) is wound around a pulley 38 provided, and a speed reduction mechanism, a drive shaft 3
7. Each nozzle shaft 20,
25 is driven to rotate. The nozzle shafts 20, 25 and the pulley 38 are vertically movable relative to each other via splines, and are coupled to rotate integrally.

The negative pressure supply system has a vacuum generator 39 for each head, and each nozzle shaft 2 is provided with a valve or the like.
Negative pressure can be sent to the passage in 0,25.

FIGS. 5 to 9 show a specific structure of the lower portion of the nozzle shaft 25. FIG. In these figures, a nozzle assembly block 30 is provided at the lower end of the nozzle shaft 25.
The holder 41 is connected to a hollow cylindrical holder 41 for rotatably displacing the holder, and the holder 41 is rotatably held by an auxiliary housing 42 (frame) provided at a lower portion of the housing 5a via a bearing 43. Have been. A horizontal axis 44 is attached to the lower end of the holder 41, and the nozzle assembly block 30 is rotatably held on the horizontal axis 44.

The horizontal axis 44 is provided with a through hole 45 in the vertical direction. The nozzle assembling block 30 includes a center hole 46 through which the horizontal axis 44 passes, and a nozzle mounting portion 47 extending radially with respect to the center hole 46 and arranged at equal intervals (equal angles) in the circumferential direction. And three through-holes 48 intersecting the center hole 46 through the nozzle mounting portions 47, and the first to third suction nozzles 26 to 28 for component suction are respectively provided in the nozzle mounting portions 47. Installed. A tapered engagement hole 49 is formed at an end of each through hole 48 opposite to the nozzle mounting portion 47.

Inside the holder 41, a vertically long positioning member 50 is accommodated so as to be vertically movable. The positioning member 50 has a vertical through-hole 51 at the center and a tapered engaging portion 52 at the lower end. Is one through hole 48 of the nozzle assembly block 30
Are engaged with the engagement holes 49.

In the holder 41, notches 54 are formed at both sides of the hollow portion in the middle portion thereof.
A pair of left and right cams 55 is disposed on the right side of the cam 4. Both cams 55
Is pivotally attached to the holder 41 by a mounting pin, an outer end of which is in contact with the lower side of the bearing 43, and an inner end thereof faces the inside of the holder 41. A notch 50a is provided on the outer peripheral surface side of the intermediate portion of the positioning member 50, and the inner ends of both cams 55 protrude into the notch 50a. When the nozzle shaft 25 and the holder 41 are at the rising end position of the normal stroke, that is, at the middle position (see FIG. 6), the inner end of the cam 55 is inclined obliquely downward. When the cam 41 swings so that the inner end of the cam 55 faces upward when the cam 41 is moved up by a predetermined amount (see FIG. 7), the positioning member 50 can be pulled up relative to the holder 41. I have.

Further, a first bevel gear 56 rotatable around a vertical axis is disposed around the holder 41, while a second bevel gear 56 meshed with the first bevel gear 56 is provided at one end of the nozzle assembly block 30. The bevel gear 57 is connected via a sleeve 58, and the second bevel gear 57 is rotatable about a horizontal axis integrally with the nozzle assembly block 30.

A flange 59 is connected to the upper end of the boss of the first bevel gear 56, and first to third engagement grooves 60a to 60c (engaged portions) are provided at a plurality (for example, three) of the flange 59. An engagement protrusion 61 (an engagement portion) is provided at the lower end of the auxiliary housing 42, and the engagement grooves 60a to 60c and the engagement protrusion 61 are provided. Constitutes a restraining means for fixing the first bevel gear. When the nozzle shaft 29 and the holder 41 are at the middle position (see FIG. 6), the engagement grooves 60a to 60c are separated from the engagement protrusion 61, and the first bevel gear 56 is in a rotatable state. When the holder 41 rises from this state by a predetermined amount (see FIG. 7), one of the engagement grooves 60a to 60c engages with the engagement protrusion 61, and the first bevel gear 56 is fixed to the auxiliary housing 42. Thereby, the rotation of the first bevel gear 56 is prevented.

As shown in FIG. 10, the engagement grooves 60a to 60c are provided at equal angles α (equal intervals) around the vertical axis. This angle α is set by a nozzle group when changing from one suction nozzle (for example, the first suction nozzle 26) to the next suction nozzle (for example, the second suction nozzle 27) in a changing operation of the suction nozzles 26 to 28 described later. The angle at which the attached block 30 rotates about the vertical axis is set, and in the present embodiment, is set to, for example, 40 °. As shown in the figure, the relationship between the first bevel gear 56 and the nozzle assembling block 30 is the first to third engagement grooves 60a to 60
c, when the first bevel gear 56 is set so that the second engagement groove 60b corresponds to the engagement protrusion 61,
The second suction nozzle 27 of the first to third suction nozzles 26 to 28 is located at a downward use position (position communicating with the nozzle shaft) and the second suction nozzle 27 has a predetermined reference rotation angle. The relative position between the first bevel gear 56 and the nozzle assembly block 30 is set. In addition, in the figure, a virtual reference mark (double circle in the figure) is attached to the nozzle assembly block 30 in order to clarify the reference rotation angle, and the nozzle assembly block 30 is on the Y axis passing through the center of the nozzle. The time when this mark exists on the rear side of the apparatus from the center of the nozzle (the lower side in the figure) is defined as the reference rotation angle.

Although not shown, the mounting machine includes a controller (control means) having a computer as a component, and the servo motors 9 and 15 for moving the head unit and the Z-axis driving mechanism. The air supply / discharge switching valve, the servomotor 36 of the R-axis drive mechanism, the electronic component recognition camera 17 and the like are all electrically connected to this controller.

During the mounting operation, the servo motor and the like are controlled by the controller in order to mount predetermined components on the printed circuit board 3 in accordance with a program stored in advance.

In particular, when changing the suction nozzles 26 to 28, as will be described in detail later, the first to third engagement grooves 60a to 60
0c, the engagement groove is selected such that the suction nozzles 26 to 28 after the change have the above-described predetermined rotation reference angle, and the R-axis is engaged with the engagement protrusion 61 to engage the engagement groove. The servo motor 36 of the drive mechanism and the above-described valves of the Z-axis drive mechanism are controlled.

According to the suction nozzle changing apparatus of the present embodiment as described above, the nozzle shaft 25 and the holder 41 are positioned at the reference position, that is, the normal stroke by the air cylinder 33 shown in FIG. Is set to the rising end position.

When the nozzle shaft 25 and the holder 41 are set at the reference positions in this manner, as shown in FIG. 6, the first bevel gear 56 becomes rotatable, and the lower end of the positioning member 50 engages. 52 is engaged with the engagement hole 49 of one through hole 48 of the nozzle assembly block 30. In this state, the nozzle assembly block 30
One of the three suction nozzles disposed in the through hole 4
8 and the like, and communicates with the inside of the nozzle shaft 25 through the nozzle assembly block 30 with respect to the holder 41.
Are prevented by the positioning member 50 from rotating about the horizontal axis. Therefore, when the nozzle shaft 25 is rotated by the R-axis drive mechanism, the holder 41, both the bevel gears 56 and 57, and the nozzle assembly block 30 are integrally rotated about the longitudinal axis.

Accordingly, when picking up components or mounting components, the Z-axis drive mechanism and the R-axis drive mechanism are driven in this state, so that the normal stroke of the nozzle is raised and lowered and the nozzle rotation angle is adjusted.

On the other hand, when the suction nozzle to be used is changed according to the change of the component to be sucked, first, the auxiliary piston 35 is raised in addition to the main piston 34 of the air cylinder 33 shown in FIG. As a result, as shown in FIG. 7, the nozzle shaft 25 and the holder 41 are set at the upper position higher than the reference position by a predetermined amount.

When the holder 41 and the like are raised,
When the cam 55 swings, the positioning member 50 is further pulled up with respect to the holder 41, and the positioning member 50
The engaging portion 52 at the lower end of the first bevel gear is disengaged from the engaging hole 49 of the nozzle assembling block 30, and one of the engaging grooves 60 a to 60 c of the first bevel gear 56 is engaged with the engaging protrusion 61 of the auxiliary housing 42. Combine. This allows the nozzle assembly block 30 to rotate around the horizontal axis with respect to the holder 41 and prevents the first bevel gear 56 from rotating.

Next, the nozzle shaft 25 is rotated by the R-axis drive mechanism. When the nozzle shaft 25 is rotated, the rotation of the first bevel gear 56 is prevented, so that the second bevel gear 57 provided at one end of the nozzle assembling block 30 is kept engaged with the first bevel gear 56. While rotating around the vertical axis, it rotates around the horizontal axis. Thereby, the nozzle assembly block 3
Since 0 is rotationally displaced about the horizontal axis, the suction nozzle which was at the use position until then is shifted from the use position. When the nozzle assembling block 30 is rotationally displaced until the suction nozzle to be newly used reaches the use position (that is, when the nozzle assembling block 30 is rotationally displaced by a predetermined angle α around the vertical axis), the R-axis driving mechanism Is stopped, the nozzle shaft 25 and the holder 41 are lowered to the middle position, whereby the nozzle assembling block 30 is returned to the locked state with respect to the holder 41 and a new suction nozzle is formed. It is held in the use position.

In this case, for example, when the nozzle shaft 25 is driven to rotate counterclockwise in FIG. 10, the suction nozzle is changed from the first suction nozzle 26 to the second suction nozzle 27 to the third suction nozzle 28. When the nozzle shaft 25 is driven to rotate clockwise in the figure, the suction nozzle is changed from the third suction nozzle 28 to the second suction nozzle 27 to the first suction nozzle 26.

In the operation of changing the suction nozzles 26 to 28, when the nozzle shaft 25 and the holder 41 are lifted from the middle position, the nozzle shaft 25 is previously rotationally driven by the R-axis drive mechanism. First
Of the third to third engagement grooves 60a to 60c, an engagement groove whose suction nozzle after change has a predetermined reference rotation angle is selected, and the holder 4 is set so that the engagement groove corresponds to the engagement protrusion 61.
1. Both bevel gears 56, 57 and nozzle assembly block 3.
After the nozzle shaft 25 is integrally rotated, the nozzle shaft 25
And the holder 41 is raised.

More specifically, as shown in FIG. 10, when the second suction nozzle 27 is in the use position and is changed to the first suction nozzle 26, it corresponds to the current engagement projection 61. An engaging groove adjacent to the second engaging groove 60b and located on a side opposite to the rotation direction of the nozzle assembling block 30 when the nozzle is changed, that is, FIG. 11 (a) (upper view).
, The third engagement groove 60c is selected, and the holder 41 and the like are integrally rotated so that the engagement groove 60c corresponds to the engagement protrusion 61.
5 and the holder 41 are raised, and the third engagement groove 60 c is engaged with the engagement protrusion 61. The relative position between each engagement groove and the engagement protrusion 61 is detected based on, for example, an output of an encoder built in the servo motor of the R-axis drive mechanism.

In this case, since the third engagement groove 60c is offset about the vertical axis by the angle α with respect to the second engagement groove 60c, the nozzle shaft 25 is rotationally driven by the R-axis drive mechanism. Accordingly, when the nozzle assembling block 30 is rotationally displaced until the first suction nozzle 26 reaches the use position, as shown in FIG. 11 ((a) lower drawing),
At the same time when the suction nozzle change is completed, the first suction nozzle 26 is set to the above-described reference rotation angle.

Similarly, in the case of changing from the first suction nozzle 26 to the second suction nozzle 27, FIG.
As shown in the figure, the second engagement groove 60b is
To change to the third suction nozzle 28 from FIG.
As shown in ((c) upper figure), the first engagement groove 60a is
When changing from the suction nozzle 28 to the second suction nozzle 27, as shown in FIG.
The holder 41 and the like are integrally rotated so that 0b respectively correspond to the engagement protrusions 61, and then the nozzle shaft 25 and the holder 41 are raised. Accordingly, in the case of changing to any of the suction nozzles, the suction nozzle is set to the predetermined reference rotation angle simultaneously with the completion of the change of the suction nozzle (the lower diagrams in FIGS. 11B to 11D).

According to the suction nozzle changing device of the surface mounter described above, the suction nozzle is set to the reference rotation angle simultaneously with the completion of the suction nozzle change as described above. It is not necessary to correct the suction nozzle to the reference rotation angle after the change, and the tact time can be shortened accordingly.

That is, as a comparative example, FIG.
As shown in FIG. 5, it is assumed that the device has only the engagement groove 60 ′ (corresponding to the second engagement groove 60 b) formed in the flange portion 59 of the above-described device. Considering the case of changing to the nozzle 28, when changing the suction nozzle, the nozzle assembling block 30 is rotated and displaced until the third suction nozzle 28 reaches the use position. The third suction nozzle 28 at the time of completion is set to be shifted from the reference rotation angle. Therefore, as shown in the figure (lower figure), it is necessary to correct the third suction nozzle 28 to the reference rotation angle.

Therefore, when sucking a part while changing the suction nozzle, for example, as shown in FIG. 13A, the nozzle shaft 25 and the holder 41 are held at the middle position, and the engaging groove 60 'is held. Is made to correspond to the engagement projection 61, the holder 41 and the like are raised to the upper position to change the suction nozzle, and then the holder 41 and the like are returned to the middle position, where the nozzle shaft 25 is rotationally driven to suction. After correcting the nozzle to the reference rotation angle, it is necessary to displace the holder 41 and the like to the lower position.

In particular, when the next component is sucked through a nozzle change after the component is mounted, the component mounting angle varies depending on the substrate or the like. You need to adjust the rotation angle for alignment,
Further, it is necessary to adjust the rotation angle after changing the nozzle.

On the other hand, in the apparatus of the above embodiment, if the rotation angle is adjusted before replacing the nozzle,
Since it is not necessary to correct the reference rotation angle of the suction nozzle, as shown in FIG. 3B, after the holder 41 and the like are held at the middle position and the engagement grooves 60a to 60c correspond to the engagement protrusions 61, After raising the holder 41 and the like to the upper position and changing the suction nozzle, the holder 41 and the like can be immediately displaced to the lower position and the component can be sucked by the suction nozzle. Therefore, the tact time can be shortened because the operation of correcting the suction nozzle to the reference rotation angle while holding the holder 41 and the like at the middle position is unnecessary.

By the way, the surface mounting machine of the above embodiment is
This is an example of the surface mounter according to the present invention, and its specific configuration can be appropriately changed without departing from the gist of the present invention.

For example, the suction nozzles 26 to 28 are arranged at equal intervals around the nozzle assembly block 30 and the nozzle assembly block 30 is configured to be able to rotate infinitely, whereby the first suction nozzle 26 → the second suction nozzle It is also possible to adopt a so-called rotary change type head configuration that allows a change form of the suction nozzle such as 27 → third suction nozzle 28 → first suction nozzle 26. In this case,
A plurality of engaging grooves may be formed at intervals of the angle α over the entire circumference of the flange portion 59.

Further, as in the above-described mounting machine, the engagement grooves 60a to 60c formed in the flange portion 59 are engaged with the engagement protrusions 61 to restrict the rotation of the first bevel gear 56 about the vertical axis. In addition to allowing the position to be changed, for example, an electromagnetic clutch or the like is provided between the auxiliary housing 42 and the first bevel gear 56 as a restraining means of the present invention, and the first bevel gear 56
May be restricted at an arbitrary position around the vertical axis.

[0058]

As described above, according to the present invention, a nozzle assembly block in which a plurality of suction nozzles are arranged is attached to the lower part of the nozzle shaft so as to be rotatable about a horizontal axis and rotatable about a vertical axis. The first bevel gear is provided, the first bevel gear meshes with the second bevel gear provided on the nozzle assembly block, and the first bevel gear is fixed to the frame so that the second bevel gear is rotated in accordance with the rotation of the nozzle shaft. In a surface mounter in which the nozzle assembly block is rotated around the horizontal axis while revolving around the vertical axis, and the nozzle assembly block is rotated accordingly, the suction nozzle after the change is rotated by a predetermined reference rotation around the vertical axis. When the first bevel gear is fixed, the constrained position of the bevel gear about the vertical axis is controlled so that the suction nozzle is changed. It can be placed on the reference rotation angle. Therefore, it is not necessary to return the suction nozzle to the reference rotation angle after each change of the suction nozzle, and the tact time is shortened by eliminating such an operation.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a surface mounter to which a suction nozzle changing device according to the present invention is applied.

FIG. 2 is a front view of a head unit in the surface mounter.

FIG. 3 is a plan view of the head unit.

FIG. 4 is a bottom view of the head unit.

FIG. 5 is an enlarged front view showing a structure of a lower portion of a head provided in the head unit.

6 is a cross-sectional view taken along line AA of FIG. 5 and shows a state in which the rotation of the first bevel gear is permitted.

FIG. 7 is a sectional view taken along line AA of FIG. 5, showing a state in which rotation of the first bevel gear is prevented.

FIG. 8 is a sectional view taken along line BB of FIG. 6;

FIG. 9 is a bottom view showing the lower end of the head provided with a nozzle assembly block and the like.

FIG. 10 is a schematic bottom view showing the lower end of the head showing the relationship between the position of the engagement groove and the nozzle assembly block.

FIG. 11 is a diagram corresponding to FIG. 10 for explaining the rotation control of the lower end of the head when the suction nozzle is changed.

FIG. 12 is a diagram illustrating a suction nozzle changing operation performed by a conventional suction nozzle changing device.

FIG. 13 is a process chart for comparing a component suction operation between the suction nozzle changing device according to the present invention and a conventional device.

[Explanation of symbols]

 5 Head unit 5a Housing 5a 20, 25 Nozzle shaft 21, 26 to 28 Suction nozzle 30 Nozzle assembly block 31, 33 Air cylinder 36 R-axis servo motor 41 Holder 42 Holding housing 49 Engagement hole 50 Positioning member 56 First bevel gear 57 Second bevel gear 59 Flange 60a-60c Engagement groove 61 Engagement projection

Claims (2)

[Claims] 1. A nozzle assembly block in which a head unit is provided with a nozzle shaft capable of ascending and descending in a vertical axis direction and rotating around the vertical axis, and a plurality of suction nozzles arranged radially below the nozzle shaft. Is mounted so as to be rotatable about a horizontal axis and is rotatable about a vertical axis, and the first bevel gear meshes with a second bevel gear provided on the nozzle assembly block. The first bevel gear can be switched between a state in which the first bevel gear is fixed to the frame of the head unit and a state in which both the bevel gears and the nozzle assembly block rotate integrally with the nozzle shaft around the longitudinal axis, and the first bevel gear is fixed. As a result, the second bevel gear rotates around the horizontal axis while revolving around the vertical axis in accordance with the rotation of the nozzle shaft, and the In the surface mounter in which the assembling block is rotationally displaced, a restraining means for restraining the first bevel gear with respect to the frame of the head unit when the first bevel gear is fixed is provided, and the first bevel gear with respect to the frame is provided. The restricting means is configured to be capable of changing the restricting position, and a control means for controlling the restricting position is provided. The controlling means arranges the suction nozzle after the change at a predetermined reference rotation angle of the vertical axis. To be,
A suction nozzle changing device in a surface mounter, wherein the restriction position is set based on a rotation angle of a nozzle assembly block about a vertical axis accompanying a suction nozzle change. 2. The two bevel gears and the nozzle assembly block move up and down relative to the frame of the head unit integrally with the nozzle shaft as the nozzle shaft moves up and down. One engagement portion and a plurality of engagement portions are provided in one bevel gear, and the engagement portion and one of the engagement portions are engaged with each other at a predetermined rising position of the nozzle shaft. Thereby, the first bevel gear is fixed, and the engaged portion moves around the vertical axis based on the number of the suction nozzles and the rotation angle about the vertical axis of the nozzle assembly block accompanying the suction nozzle change. The control means is formed at a predetermined interval, and when the suction nozzle is changed, the control unit can dispose the changed suction nozzle among the plurality of engaged portions at the reference rotation angle. 2. The surface mounting according to claim 1, wherein the surface mounting is configured to examine a portion and to control a rotation and a raising / lowering operation of the nozzle shaft so as to engage the engaged portion with the engaging portion. Nozzle change device in the machine.