JP2006147719A - Surface mounter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance impact absorption performance and component suction stability by reducing a load being applied to a component when buffering action is exhibited by allowing up/down movement of a nozzle assembling block relatively to a nozzle shaft in a surface mounter at the time of sucking a component. <P>SOLUTION: A nozzle assembling block 30 having a plurality of nozzles 31 is fixed rotatably about the horizontal axis to the lower end of a nozzle shaft 21 provided to move up and down for a head unit 5, and a block drive shaft 40 for rotating the nozzle assembling block 30 through a drive mechanism is arranged on the side of the nozzle shaft 21. The nozzle assembling block 30 is fixed to move up and down relatively to the nozzle shaft 21, the block drive shaft 40 is coupled not to move up and down relatively to the nozzle shaft 21, and the block drive shaft 40 can move up and down relatively to the nozzle assembling block 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a surface mounter for sucking and mounting a component on a substrate by sucking a component to a component suction nozzle provided in a head unit, and particularly comprising a plurality of nozzles arranged radially, The present invention relates to a surface mounter that includes a nozzle assembly block that is attached to a lower end portion so as to be rotatable about a horizontal axis, and that reduces a collision load when a component is sucked.

  Conventionally, a head unit is provided so as to be movable on the XY plane, and a mounting head composed of a nozzle shaft and a suction nozzle provided at the lower end of the head unit is mounted on the head unit so as to be movable up and down. 2. Description of the Related Art Generally, a surface mounter configured to suck a chip component such as an IC from a component supply unit by a head, convey it onto a printed board, and mount it at a predetermined position on the printed board is generally known.

  In this type of surface mounter, for example, as shown in Patent Document 1, a nozzle assembly block in which a plurality of nozzles are arranged radially is arranged around the horizontal axis at the lower end of a nozzle shaft of a mounting head mounted on a head unit. A mounting machine has also been proposed in which the nozzle can be selectively set at a predetermined use position according to the type of component by rotatingly mounting and rotating the nozzle assembly block.

  In the mounting machine disclosed in Patent Document 1, a mechanism for rotating the nozzle assembly block is equipped with a rotatable block driving shaft extending in the vertical direction on the side of the nozzle shaft, and the shaft is driven by a motor. While being driven to rotate, a transmission mechanism is provided between the lower end portion of the shaft and the nozzle assembly block to rotate the nozzle assembly block around the horizontal axis as the shaft rotates.

  In this type of surface mounting machine, the mounting head is moved up and down during component pick-up or component mounting to perform suction mounting. When the nozzle abuts the component at the lowered position during component suction, Sometimes, when a component adsorbed by the nozzle at the lower end position comes into contact with the substrate, it is required to mitigate the impact acting on the component and prevent damage to the component.

  For this reason, in the mounting machine shown in Patent Document 1, the nozzle assembly block is attached so as to be movable in the vertical direction relative to the nozzle shaft, and further, the lock for preventing the nozzle assembly block from moving in the vertical direction relative to the nozzle shaft. A mechanism is provided to allow the lock mechanism to operate near the head lower end when sucking and mounting parts, and to unlock the lock mechanism near the head lower end, allowing the nozzle assembly block to move relative to the nozzle shaft in the vertical direction. To provide a buffering action.

More specifically, the nozzle assembly block is rotatably held by a holder, and the holder is attached to the nozzle shaft so as to be relatively movable in the vertical direction, and the lower end portion of the block driving shaft is connected to the nozzle assembly block. When the lock mechanism is unlocked in the vicinity of the head lowering end by being connected to the holder via the connecting means in a state where it is connected to the transmission means between the nozzle assembly block and the The holder and the block driving shaft are integrally moved up and down with respect to the nozzle shaft.
JP 2000-315894 A

  According to the surface mounting machine shown in the above-mentioned Patent Document 1, when the buffer assembly is exerted by allowing the relative movement of the nozzle assembly block and the like relative to the nozzle shaft in the vicinity of the head descending end, In addition to the holder, the weight of the block driving shaft also acts on the component, and the block driving shaft is offset from the center of the nozzle, so that an uneven load acts on the component. Such a load applied from the block driving shaft is not preferable for shock absorption and component adsorption stability.

  The present invention has been made in view of the above problems, and when a buffer action is exerted by allowing relative movement of the nozzle assembly block and the like relative to the nozzle shaft in the vertical direction, the load of the block driving shaft is applied. The object is to provide a surface mounter that can avoid and improve shock absorption and component adsorption stability.

  In order to solve the above-described problems, the present invention provides a movable head unit in which a nozzle shaft extending in the vertical direction is provided to be movable up and down, and a nozzle assembly block having a plurality of nozzles is provided at the lower end of the nozzle shaft. As a mechanism for rotating around the horizontal axis and rotating the nozzle assembly block, a rotatable block driving shaft located on the side of the nozzle shaft and extending in the vertical direction, and the block driving shaft In the surface mounter equipped with a driving means for rotating the nozzle and a transmission mechanism for transmitting the rotation of the block driving shaft to the nozzle assembly block, the nozzle assembly block is vertically moved by a predetermined amount with respect to the nozzle shaft. The block drive shaft is mounted on the nozzle shaft in a bracket. The block drive shaft and the nozzle assembly block are coupled to each other via the transmission mechanism in a state in which the block driving shaft and the nozzle assembly block can be relatively moved in the vertical direction. It is what.

  According to this configuration, the nozzle assembly block moves relative to the nozzle shaft in the vertical direction when the nozzle abuts against the component during component adsorption or when the component adsorbed to the nozzle abuts against the substrate during component mounting. By doing so, the impact is alleviated.

  In this case, the block drive shaft is connected to the nozzle shaft so as not to move in the vertical direction, and the block drive shaft and the nozzle assembly block can be moved in the vertical direction. The weight of the block drive shaft does not work.

  Therefore, compared with the conventional structure as shown in the above-mentioned Patent Document 1, the impact load is reduced by the weight of the block driving shaft, and the impact absorbing action is enhanced. In addition, an uneven load is not applied to the component from the block driving shaft, so that the displacement of the component adsorption position and the occurrence of an adsorption error due to the uneven load are prevented, and the adsorption stability is improved.

  In the surface mounting machine of the present invention, the nozzle assembly block is attached to a holder provided at the lower end portion of the nozzle shaft so as to be capable of relative movement in the vertical direction so as to be rotatable via a horizontal axis. A driving side gear provided at the lower end of the driving shaft, a driven side gear provided on the holder and meshing with the driving side gear, and disposed between the driven side gear and the nozzle assembly block. Preferably, the drive-side gear is spline-fitted so as to rotate integrally with the block drive shaft in a state in which the drive-side gear is relatively movable in the vertical direction.

  In this way, the block driving shaft and the gear of the transmission mechanism can be moved relative to each other in the vertical direction, so that the relative movement in the vertical direction between the block driving shaft and the nozzle assembly block is not hindered. Meanwhile, the rotation of the block driving shaft is transmitted to the nozzle assembly block via the driving gear, the driven gear, and the transmission member.

  In addition, a positioning member that is displaceable between a block rotation preventing state in which the holder is engaged with the nozzle assembly block to prevent rotation of the nozzle assembly block and a block rotation allowable state in which the holder is detached from the nozzle assembly block. And an air cylinder for operating the positioning member, and an air passage for supplying operating air to the air cylinder is disposed across the block driving shaft and the holder, The positioning member is in the block rotation permissible state when operating air is supplied, and the positioning member is biased to the block rotation preventing state when operating air is not supplied. Preferably it is.

  In this case, when the positioning member is in the block rotation prevention state, since the operating air is not supplied, air pressure is applied to the seal portion that seals the air passage between the block driving shaft and the holder. For this reason, the sliding resistance of the seal portion is reduced during rotation operation during the mounting operation, and the durability of the seal portion is improved.

  According to the present invention, when the cushioning action is exerted by allowing the nozzle assembly block to move in the vertical direction relative to the nozzle shaft when the component is mounted, the weight of the block driving shaft is not added to the component. The load can be further reduced, and the displacement of the adsorption position and the adsorption mistake due to the uneven load can be prevented.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 schematically shows the overall configuration of a surface mounter according to an embodiment of the present invention. In this figure, a conveyor 2 constituting a conveyance line is arranged on a base 1, and a printed board 3 is conveyed on the conveyor 2 and stopped at a predetermined work position.

  A component supply unit 4 is disposed on the side of the conveyor 2. The component supply unit 4 is provided with, for example, multiple rows of tape feeders 4a. Each tape feeder 4a is configured such that small pieces of electronic components such as ICs, transistors, capacitors and the like are accommodated at predetermined intervals, and the held tape is led out from the reel. It is designed to be taken out intermittently.

  A head unit 5 for mounting electronic components is provided above the base 1. The head unit 5 is movable between a component supply unit 4 and a predetermined work position of the printed circuit board 3, and in this embodiment, the X-axis direction (the direction of the conveyor 2) and the Y-axis direction (the X-axis on the horizontal plane). It is possible to move in a direction orthogonal to the direction.

  That is, a pair of fixed rails 7 extending in the Y-axis direction and a ball screw shaft 8 that is rotationally driven by a Y-axis servo motor 9 are disposed on the base 1, and a head unit is disposed on the fixed rail 7. A support member 11 is disposed, and a nut portion 12 provided on the support member 11 is screwed onto the ball screw shaft 8. The support member 11 is provided with a guide member 13 extending in the X-axis direction and a ball screw shaft 14 driven by an X-axis servo motor 15 so that the head unit 5 can move on the guide member 13. A nut portion (not shown) held by the head unit 5 is screwed onto the ball screw shaft 14. Then, 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 to thereby rotate the head unit 5. Moves in the X-axis direction with respect to the support member 11.

  Further, the base 1 is provided with component recognition cameras 17 and 18 for recognizing the suction state of the electronic component sucked by the head unit 5, and after the head unit 5 picks up the component, the component recognition cameras 17 and 18 are provided. The suction component is imaged by moving upward.

  FIG. 2 shows a specific structure of the head unit 5. In this figure, the head unit 5 is mounted with a head 20 having a plurality of nozzles for sucking electronic components in the lower part. In the present embodiment, the head unit 5 is provided with two heads 20 arranged in the X-axis direction.

  Each head 20 has a nozzle shaft 21 extending in the vertical axis direction (vertical direction). The nozzle shaft 21 is supported by the frame 5a of the head unit 5 so as to be capable of moving up and down in the vertical axis and rotating around the vertical axis. In addition, a nozzle assembly block 30 having a plurality of nozzles 31 is provided below the nozzle shaft 21.

  A plurality (for example, five) of nozzles 31 and one nozzle holder 32 are assembled to the nozzle assembly block 30. More specifically, the nozzle 31 has a small-diameter nozzle mainly for small parts such as chip parts, and a large-diameter nozzle mainly for large-sized parts such as QFP that require mounting accuracy. The nozzle is assembled. In the case of mounting special parts other than chip parts and QFP, nozzles corresponding to these parts are mounted on the nozzle holder 32.

  The nozzle assembly block 30 can be moved up and down relative to the nozzle shaft 21 and can rotate about the vertical axis integrally with the nozzle shaft 21. Further, the nozzle assembly block 30 is rotatable relative to the nozzle shaft 21 around the horizontal axis, and due to this rotational displacement, the nozzle 31 and the nozzle holder 32 (hereinafter, there is no need to distinguish between them). The nozzles 31 and 32 are arranged radially in the nozzle assembly block 30 so that one of them is selectively set at a predetermined use position.

  The head unit 5 further includes a Z-axis drive mechanism for moving the nozzle shaft 21 up and down, an R-axis drive mechanism for rotating the nozzle shaft 21, a block drive mechanism for rotating the nozzle assembly block 30, and a nozzle A lock mechanism or the like that locks the displacement of the nozzle assembly block 30 relative to the shaft 21 in the vertical axis direction is provided for each head 20.

  The Z-axis drive mechanism includes a Z-axis servomotor 23 as a drive source that is fixed to the upper left and right sides of the frame 5a, and a rack 24 that extends in the vertical direction and is supported so as to be movable up and down with respect to the frame 5a. The rack 24 is connected to the upper end of the nozzle shaft 21 via a bracket 25, and a pinion 26 is mounted on the output shaft of the Z-axis servomotor 23. The pinion 26 meshes with the rack 24. It is comprised by doing. That is, when the pinion 26 is rotated by the operation of the Z-axis servomotor 23, the rack 24, the bracket 25 and the nozzle shaft 21 are integrally moved up and down with respect to the frame 5a.

  The R-axis drive mechanism is attached to the R-axis servomotor 27 as a drive source fixed to the center portion of the frame 5a, a drive gear (not shown) attached to the output shaft, and the nozzle shaft 21. And the gear 28 meshing with the drive gear, and the nozzle shaft 21 is rotationally driven by the operation of the R-axis servomotor 27. The nozzle shaft 21 and the gear 28 are splined so that the gear 28 can be moved up and down relative to the nozzle shaft 21 and the nozzle shaft 21 and the gear 28 rotate together.

  3 and 4 show a specific structure of the lower portion of the nozzle shaft 21. FIG. In these drawings, the nozzle shaft 21 has a double tube structure in which a hollow sub shaft 21b is also disposed inside a hollow main shaft 21a, so that the inside and outside of the sub shaft 21b in the main shaft 21a are arranged inside and outside. Passages 22a and 22b are formed. The passage 22a inside the sub shaft 21b is for supplying a negative pressure for component suction to the nozzle 31, and its upper end is connected to a negative pressure supply source (not shown) via a valve or the like. . The passage 22b outside the sub shaft 21b is for supplying air to a pressure chamber 70 which will be described later, and is connected to an air supply source (not shown) via a valve or the like.

  An inverted U-shaped holder 35 is connected to the lower end of the nozzle shaft 21 for holding the nozzle assembly block 30 so as to be capable of rotational displacement about the horizontal axis. The holder 35 and the nozzle shaft 21 are coupled via a spline nut 36 so that the holder 35 can move relative to the nozzle shaft 21 in the vertical direction, and the nozzle shaft 21 and the holder 35 rotate integrally around the vertical axis. Has been. A horizontal shaft 37 is rotatably mounted on the holder 35, and the nozzle assembly block 30 is fixed to the horizontal shaft 37.

  The nozzle assembly block 30 has a plurality of nozzle assembling recesses 33 extending in the direction orthogonal to the horizontal axis 37 at equal intervals in the rotation direction. The nozzles 31 and 32 are assembled in a radial manner on the nozzle assembly block 30 by being inserted and fixed.

  The nozzle assembly block 30 is rotationally driven around the horizontal axis 37 by the block drive mechanism, so that one of the nozzles 31 and 32 or the nozzle holder is selectively used at a predetermined use position, that is, the head 20. It is arranged at the lower end of.

  The block drive mechanism includes a block drive shaft 40, a servo motor 41 (see FIG. 2) as drive means for rotating the shaft 40, and a transmission for transmitting the rotation of the shaft 40 to the nozzle assembly block 30. Mechanism.

  More specifically, the block driving shaft 40 extends in parallel with the nozzle shaft 21 as shown in FIGS. 2 to 4, and is moved up and down and rotated about the vertical axis with respect to the frame 5 a of the head unit 5. It is possible. A pulley 42 is mounted on the shaft 40, a pulley 43 is mounted on the output shaft of the servo motor 41, and a belt (not shown) is mounted across the pulleys 42 and 43. Thus, the shaft 40 is rotationally driven by the operation of the servo motor 41. Splines are formed on the outer peripheral surface of the shaft 40. The shaft 40 and the pulley 42 are splined so that the shaft 40 can be moved up and down relative to the pulley 42 and the shaft 40 and the pulley 42 rotate integrally.

  The shaft 40 is connected to the nozzle shaft 21 via a bracket 28 so as to be rotatable and not movable relative to the vertical direction. That is, the upper end of the shaft 40 is connected to the bracket 25 that connects the nozzle shaft 21 and the rack 24 so as to be rotatable and not relatively moved in the vertical direction. On the other hand, the lower part of the shaft 40 is rotatably supported by one end of a bridge member 44 attached to the upper end part of the holder 35 so as to be relatively rotatable. The nozzle shaft 21 is supported by the upper and lower bearings 5b and 5b so as to be movable up and down with respect to the frame 5a, and is rotatably supported. The shaft 40 can be moved up and down with respect to the frame 5a and rotatable. Supported. As a result, the bracket 25, the head 20 and the shaft 40 are integrally movable up and down, and the shaft 40 and the nozzle shaft 21 are rotatable independently of each other.

  An air passage 45 is formed inside the shaft 40, and the air passage 45 is connected to an air supply source (not shown) via a hose 45a, an electromagnetic valve 45b, and the like.

  The transmission mechanism includes a drive side gear 46 provided at the lower end portion of the shaft 40, and a driven side gear 47 that is rotatably mounted on the upper end portion of the holder 35 and meshes with the drive side gear 46. And a transmission member such as a transmission shaft 50 disposed between the driven side gear 47 and the nozzle assembly block 30. A gear 51 is provided at the upper end of the transmission shaft 50, and the gear 51 is engaged with a gear 48 provided integrally with the driven gear 47. A bevel gear 52 is integrally provided at the lower end of the transmission shaft 50, and meshes with a bevel gear 53 that is integrally assembled with the nozzle assembly block 30.

  As a result, when the servo motor 41 is operated and the block driving shaft 40 rotates, this rotation is converted into rotation around the horizontal axis via the gears 46, 47, 48, 51, the transmission shaft 50 and the bevel gears 52, 53. The block drive mechanism is configured to be transmitted to the nozzle assembly block 30 while being performed.

  The nozzle assembly block 30 is formed with passages 56 for supplying negative pressure to the nozzles 31 and 32 respectively. One end of each of the passages 56 is inside the nozzles 31 and 32. One end of the nozzle assembly block 30 is open at the other end. Only the passage 36 corresponding to the nozzles 31 and 32 set at the predetermined use position communicates with the passage 22a in the sub shaft 21b via the passage 57 formed in the holder 35. Thus, a negative pressure for component adsorption is supplied.

  In the nozzle assembly block 30, an engagement hole 60 for positioning the nozzles 31 and 32 is formed on the side of the recess 33 for assembling each nozzle, and is engaged with the engagement hole 60. The holder 35 is provided with an air cylinder 62 having a possible tapered positioning member 61.

  The air cylinder 62 is disposed above the nozzle assembly block 30. A piston 63 integral with the positioning member 61 is provided inside the air cylinder 62, and a pressure chamber 64 is formed below the piston 63, and the pressure chamber 64 is formed inside the holder 35 and the bridge member 44. The air passages 65 and 66 communicate with the air passage 45 in the block driving shaft 40. On the other hand, a chamber 67 above the piston 63 in the air cylinder 62 is opened to the atmosphere, and a spring 68 is disposed in the chamber 67. When air pressure is not supplied to the pressure chamber 64, the piston 63 is biased to the lowered position by the spring 68, so that the positioning member 61 is engaged with the engagement hole 60, and the pressure chamber 64 is When air is supplied, the piston 63 rises so that the positioning member 61 is detached from the engagement hole 60.

  In order to prevent air from leaking from the air passages 65, 66 when air is supplied to the pressure chamber 64, a seal portion 69 is provided around the air passages 65, 66 in the portion where the holder 35 and the bridge member 44 are in sliding contact. Is provided.

  The lock mechanism for locking the vertical displacement of the nozzle assembly block 30 with respect to the nozzle shaft 21 includes an upper pressure chamber constituting member 71 and a holder attached to the lower end of the nozzle shaft 21, as shown in FIGS. 35 has a pressure chamber 70 formed between the lower pressure chamber constituting member 72 attached to 35. The pressure chamber 70 communicates with a passage 22 b outside the sub shaft 21 b in the nozzle shaft 21. In the locked state, air is supplied to the pressure chamber 70 and the holder 35 is pressed downward by the air pressure, so that the holder 35 is restrained to the lower end position within the vertically movable range with respect to the nozzle shaft 21. On the other hand, in the unlocked state, the supply of air to the pressure chamber 70 is stopped, and thereby the vertical displacement of the holder 35 relative to the nozzle shaft 21 is allowed. That is, when the lock mechanism is in the locked state, the holder 35 completely follows the lifting and lowering operation of the nozzle shaft 21, and when the component is sucked and mounted in the unlocked state, the holder 35 is brought into contact with the component of the nozzle 31 and the like. The nozzle shaft 21 is displaced relative to the upper side so that a buffer function is exhibited.

  A passage constituting member 73 that forms a passage 74 communicating with the passage 22a inside the sub shaft 21b in the nozzle shaft 21 is inserted into the upper pressure chamber constituting member 71. While being connected to the shaft 21 b, the lower end of the passage constituting member 73 enters into the lower pressure chamber constituting member 72, and leads from here to a passage 57 formed in the holder 35. The passage member 73 and the lower pressure chamber member 72 are integrated by screw connection.

  According to the apparatus of this embodiment as described above, as a component mounting operation, first, the head unit 5 moves to the component supply unit 4, where the head 20 is lowered and the component is adsorbed by the nozzle 31 at the lower end position. After that, the head 20 rises. After the components are sucked in this way, the head unit 5 moves onto the printed circuit board 3 through operations such as imaging by the cameras 17 and 18 and component recognition based on the images, and the head 20 moves down to the nozzle 31 here. The sucked parts are mounted on the printed circuit board 3.

  In such a component mounting operation, the holder 35 and the nozzle assembly block 30 are moved relative to the nozzle shaft 21 in the vertical direction by the lock mechanism except when the head 20 is in the vicinity of the descending end position when the component is attached and mounted. Although it is locked so as not to move, when the head 20 is in the vicinity of the descending end, the lock by the lock mechanism is released. In this unlocked state, the vertical movement of the nozzle assembly block 30 with respect to the nozzle shaft 21 is allowed, so that the impact applied to the parts is reduced.

  In this case, the nozzle assembly block 30, the holder 35, the bridge member 44, and the gears incorporated therein move relative to the nozzle shaft 21 in the vertical direction, but the block driving shaft 40 is relative to the nozzle shaft 21. Therefore, the weight of the nozzle shaft 21 is not added to the parts. Therefore, compared with the conventional structure in which the weight of the nozzle shaft 21 is also applied to the component, the weight applied to the component is reduced and the impact load is reduced.

  Furthermore, since no offset load is applied to the component from the block driving shaft 40, a shift in the component suction position and a suction error due to the offset load are prevented, and the component suction stability is improved.

  When the nozzle to be used is changed, first, the valve 45b provided between the air supply source and the passage 45 in the block driving shaft 40 is opened, and the inside of the block driving shaft 40 is changed. By supplying air to the pressure chamber 64 of the air cylinder 62 through the passage 45 and the passages 65 and 66 formed inside the holder 35 and the bridge member 44, the positioning member 61 is engaged as shown in FIG. It will detach | leave from the joint hole 60, and will be in the state (block rotation permissible state) in which the rotation of the nozzle assembly block 30 around the horizontal axis is permitted. In this state, when the block driving shaft 40 is rotationally driven by the servo motor 41, the rotation is transferred to the nozzle assembly block 30 via the gears 46, 47, 48, 51, the transmission shaft 50, and the bevel gears 52, 53. Then, the nozzle assembly block 30 rotates around the horizontal axis. By the rotation of the nozzle assembly block 30, a nozzle 31 different from the nozzle 31 that has been used up to that point is set to the use position (lower end position).

  When the nozzle changing operation is completed, the air supply to the air cylinder 62 is stopped, and the air is discharged from the pressure chamber 64, whereby the positioning member 61 is engaged by the urging force of the spring 68 as shown in FIG. The nozzle assembly block 30 is engaged with the joint hole 60 to prevent the nozzle assembly block 30 from rotating about the horizontal axis (block rotation prevention state). The block rotation prevention state is maintained during the mounting operation by the head 20.

  In this way, air is supplied to the air cylinder 62 only when the block rotation is allowed to change the nozzle to be used, and when the block rotation is blocked during mounting work, the air is discharged. Therefore, the sliding resistance of the seal portion 69 is reduced when the head rotates during the mounting operation.

  That is, in the mounting operation, the rotation of the head 20 around the vertical axis may be performed by driving the R-axis servomotor 27 in order to adjust the angle of the suction component in the rotation direction. 35 and the nozzle assembly block 30 rotate, and the holder 35 and the bridge member 44 slide on each other at the fitting portion. At this time, the gear 48 that is loosely fitted to the holder 35 is rotationally driven by the gear 51 that is integral with the holder 35, so that the gear 47 that is fixedly integrated with the gear 48 and the gear 46 that meshes with the gear 47, The shaft 40 is freely rotatable. In this case, if air pressure is applied to the seal portion 69 arranged at the fitting portion between the holder 35 and the bridge member 44, the sliding resistance increases and the seal portion 69 is easily worn. In the embodiment, when the block rotation is blocked during the mounting operation as described above, air is discharged from the pressure chamber 64 of the air cylinder 62 and the passages 65 and 66 leading to the pressure chamber 64, and the seal portion 69 has a large amount. Since no air pressure is applied, sliding resistance during head rotation is reduced. Therefore, the durability of the seal portion 69 is improved.

It is a top view which shows roughly the whole structure of the surface mounting machine which concerns on embodiment of this invention. It is a partial cross section front view of the head unit in the surface mounter of FIG. FIG. 2 is a front cross-sectional view illustrating a main part of a head in the surface mounting machine of FIG. 1 when a positioning member with respect to a nozzle assembly block is in a block rotation blocking state. FIG. 2 is a front cross-sectional view illustrating a main part of a head in the surface mounter of FIG. 1 when a positioning member with respect to a nozzle assembly block is in a block rotation allowable state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Printed circuit board 5 Head unit 20 Head 21 Nozzle shaft 25 Bracket 30 Nozzle assembly block 31 Nozzle 35 Holder 37 Horizontal axis 40 Block drive shaft 45, 65, 66 Air passage 46, 47 Gear of transmission mechanism

Claims (3)

In the movable head unit, a nozzle shaft extending in the vertical direction is provided so as to be movable up and down. As a mechanism for rotating the nozzle assembly block, a rotatable block driving shaft that is located on the side of the nozzle shaft and extends in the vertical direction, driving means for rotating the block driving shaft, and the block driving shaft In a surface mounter equipped with a transmission mechanism that transmits the rotation of the shaft to the nozzle assembly block,
The nozzle assembly block is attached to the nozzle shaft so as to be movable in the vertical direction by a predetermined amount.
The block driving shaft is connected to the nozzle shaft via a bracket so that the block driving shaft is rotatable and cannot be relatively moved in the vertical direction. The block driving shaft and the nozzle assembly block are relatively movable in the vertical direction. A surface-mounting machine characterized in that it is interlocked and connected via the transmission mechanism in a state. The nozzle assembly block is attached to a holder provided at the lower end portion of the nozzle shaft so as to be capable of relative movement in the vertical direction so as to be rotatable via a horizontal axis.
The transmission mechanism includes a driving side gear provided at a lower end portion of the block driving shaft, a driven side gear provided on the holder and meshing with the driving side gear, and the driven side gear and the nozzle assembly block. A transmission member disposed therebetween,
2. The surface mounter according to claim 1, wherein the driving side gear is spline-fitted so as to rotate integrally with the block driving shaft in a state in which the driving side gear can be relatively moved in the vertical direction. A positioning member that is displaceable between a block rotation preventing state in which the holder is engaged with the nozzle assembly block to prevent rotation of the nozzle assembly block and a block rotation allowable state in which the holder is detached from the nozzle assembly block; An air cylinder for operating the positioning member,
An air passage for supplying operating air to the air cylinder is disposed across the block driving shaft and the holder,
When the operation air is supplied to the air cylinder, the positioning member is allowed to block rotation, and when the operation air is not supplied, the positioning member is biased to the block rotation prevention state. The surface mounter according to claim 2, wherein the surface mounter is configured as follows.

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