JP4451287B2 - Surface mount machine - Google Patents

Description

  The present invention relates to a surface mounter for mounting various components including electronic components on a circuit board. In particular, the mounting head includes a rotating body (nozzle assembly block) having a plurality of nozzles. The present invention relates to a surface mounter that advances a mounting process while switching nozzles according to the rotation of a nozzle assembly block.

  Conventionally, a mounting head movable between a component supply unit and a printed circuit board positioned at a predetermined work position has been provided, and a component suction nozzle attached to the lower end of the head is used to absorb the component from the component supply unit. A surface mounter for mounting on a printed circuit board is known.

In this type of surface mounting machine, it is common to supply a negative pressure to the nozzle tip through a negative pressure passage formed in the head and suck the parts by this negative pressure. As a result, troubles such as a failure of the negative pressure supply source may be induced, or dust may accumulate in the negative pressure supply path and hinder component adsorption. In view of this, an air filter is incorporated in the nozzle, and the air filter is replaced at an appropriate time to prevent troubles caused by foreign matter suction or the like (for example, Patent Document 1).
JP 2003-101292 A

  In recent years, surface mounting machines have been equipped with a rotating body (nozzle assembly block) in which a plurality of types of nozzles are arranged around the mounting head, and the mounting process is performed while switching the nozzles by rotating the block. Mounting machines are being developed.

  The surface mounting machine having such a head structure is also similar in that it is required to prevent troubles caused by suction of foreign matters. However, when the conventional configuration in which the air filter is incorporated inside the nozzle is applied as it is, the air filter is removed while removing the nozzle assembly block from the mounting head during the maintenance of the air filter, and further detaching the nozzle from the block. Therefore, the workability is very bad. Therefore, it is necessary to solve this point.

  The present invention has been made in view of the above circumstances. The mounting head includes a rotating body (nozzle assembly block) in which a plurality of nozzles are arranged around the nozzle, and the nozzles are switched according to the rotation of the block. An object of the surface mounter that advances the mounting process is to improve the workability of the air filter while providing an air filter to prevent troubles caused by suction of foreign matters.

In order to solve the above problems, the present invention provides a nozzle assembly block in which a plurality of nozzles are arranged in the circumferential direction, and is rotatably supported by a block support portion of a mounting head. A plurality of independent first negative pressure supply passages communicating with each other are provided, while the block support portion is provided with one second negative pressure supply passage leading to a negative pressure supply source, and the nozzle assembly block With the rotation of the nozzle, the nozzle is disposed at a predetermined working position, so that only the first negative pressure supply passage corresponding to the nozzle communicates with the second negative pressure supply passage and is a component with respect to the nozzle. in the negative possible pressure supply become configured as a surface mounting machine for adsorption, attaching the air filter to the end opening of the negative pressure outlet side of the second negative pressure supply passage in said block support portion An insertion recess is provided, and an air filter is attached to the insertion recess, and the inlet side of the insertion recess is closer to the insertion recess than the air filter around the first and second negative pressure supply passages. By inserting a sealing member for sealing between the nozzle assembly block and the block support portion, the air filter is prevented from being detached from the insertion recess .

  According to such a configuration, when foreign matter or the like is sucked by mistake, the foreign matter or the like is captured by the air filter provided in the second negative pressure supply passage of the block support portion. Also, during maintenance of the air filter, by removing the nozzle assembly block from the block support portion and replacing the air filter provided at the negative pressure outlet port portion of the second negative pressure supply passage in the block support portion, Maintenance work of the air filter can be performed with each nozzle attached to the nozzle assembly block. Furthermore, if the nozzle assembly block is removed from the block support portion, the first negative pressure supply passage and the interior of each nozzle can be cleaned by blowing air immediately.

Further, according to this configuration, the first negative pressure supply passage and the second negative pressure supply passage are connected to each other without any gap by sealing the nozzle assembly block and the block support portion with the seal member. At the same time , the elastic force of the seal member presses the air filter against the back end of the insertion recess, thereby preventing the air filter from dropping from the insertion recess.

According to the surface mounter of the present invention , as described above, during maintenance of the air filter, if the nozzle assembly block is removed from the block support portion, the air filter can be replaced while each nozzle is assembled to the nozzle assembly block. It can be carried out. Therefore, in the surface mounter that advances the mounting process while switching the nozzles with the rotation of the nozzle assembly block, it is possible to effectively prevent troubles due to foreign matter suction and the like, while improving the maintenance workability of the air filter. . Further, the first negative pressure supply passage and the inside of each nozzle can be cleaned while each nozzle is mounted on the nozzle assembly block, and the cleaning workability is improved. In addition , since the air filter is provided on the block support side, the air filter can be made common to a plurality of nozzles, so that the above-described trouble can be prevented with a rational configuration, and the common use. Therefore, the maintenance workability of the air filter can be further improved as the number of air filters is reduced. In addition, a rational use of a sealing member that is structurally essential to seal between the nozzle assembly block and the block support portion around the first and second negative pressure supply passages as a member for fixing the air filter Typical configuration is achieved.

  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 a first 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) that is held and provided in the head unit 5 is screwed into 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.

  2 and 3 show a specific structure of the head unit 5. In these drawings, the head unit 5 is mounted with a head 20 having a plurality of nozzles 31 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 (see FIG. 1).

  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.

  The nozzle shaft 21 has a double pipe structure in which a hollow sub shaft 21b is also disposed inside a hollow main shaft 21a, so that passages 22a and 22b are formed inside and outside the sub shaft 21b in the main shaft 21a. Is 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.

  A plurality (for example, five) of nozzles 31 and one nozzle holder 32 are assembled to the nozzle assembly block 30 (see FIG. 5). More specifically, the nozzle 31 has a small diameter nozzle 31 mainly for small parts such as chip parts, and a large diameter mainly for parts that are large parts such as QFP and require mounting accuracy. Nozzle 31 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). Each nozzle etc. 31, 31, 32) in the nozzle assembly block 30 so that one nozzle 31 or nozzle holder 32 is selectively set at a predetermined use position (working position). 32 are arranged radially.

  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 has a Z-axis servomotor 23 as a drive source 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 to be movable up and down with respect to the frame 5a. is doing. The rack 24 is connected to the upper end of the nozzle shaft 21 via a bracket 25. A pinion 26 is attached to the output shaft of the Z-axis servomotor 23, and the pinion 26 meshes with the rack 24. That is, when the pinion 26 is rotated by the operation of the Z-axis servomotor 23, the Z-axis drive mechanism is configured so that the rack 24, the bracket 25, and the nozzle shaft 21 are moved up and down integrally with the frame 5a. .

  The R-axis drive mechanism is mounted on the nozzle shaft 21 and an R-axis servomotor 27 as a drive source fixed to the center portion of the frame 5a, a drive gear (not shown) mounted on the output shaft thereof. And a gear 28 meshing with the drive gear, and the nozzle shaft 21 is driven to rotate by the operation of the R-axis servo motor 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, an inverted U-shaped holder 35 (corresponding to a block support portion of the present invention) for holding the nozzle assembly block 30 so as to be capable of rotational displacement about the horizontal axis is provided at the lower end portion of the nozzle shaft 21. It is connected. The holder 35 and the nozzle shaft 21 are coupled via a spline nut 36 so that the holder 35 can be moved relative to the nozzle shaft 21 in the vertical direction, and the nozzle shaft 21 and the holder 35 rotate together. .

  The holder 35 is provided with a pair of legs 35a that hang downward. A horizontal shaft 37 is rotatably mounted across the legs 35a, and the nozzle assembly block 30 is fixed to the horizontal shaft 37. Has been.

  The nozzle assembly block 30 is formed in a substantially cylindrical shape having a through-hole 30a into which the horizontal shaft 37 is inserted, and a plurality of nozzle mounting recesses 33 extending in a direction perpendicular to the horizontal shaft 37 is formed on the outer peripheral surface thereof. Are formed at equal intervals in the rotation direction, and the nozzles 31 and 32 are fitted and fixed in these recesses 33. As a result, the nozzles 31 and 32 are assembled radially on the outer peripheral surface of the nozzle assembly block 30.

  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 32 is selectively used at a predetermined use position, that is, The head 20 is arranged at the lower end downward.

  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, as shown in FIGS. 2 and 3, the block driving shaft 40 extends in parallel with the nozzle shaft 21 and can move up and down and rotate around the vertical axis with respect to the frame 5a of the head unit 5. It has become. 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 has an upper end connected to the bracket 25 that connects the nozzle shaft 21 and the rack 24 so that the shaft 40 can rotate and cannot be displaced in the vertical direction. On the other hand, the lower portion of the shaft 40 is rotatably supported via a bearing on a bridge member 44 that is mounted on the upper end portion 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 rotated by the upper and lower bearings 5c and 5c. Supported as possible. 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. Therefore, the shaft 40 can move relative to the nozzle assembly block 30 and the holder 35 in the vertical direction.

  A passage 45 for guiding air (positive pressure) is formed inside the shaft 40, and the passage 45 is connected to an air supply source via a hose and an electromagnetic valve, etc., not shown.

  The transmission mechanism includes a drive side gear 46 provided at the lower end portion of the shaft 40, a driven side gear 47 which is mounted on the upper end portion of the holder 35 so as to be relatively rotatable and meshes with the drive gear, A transmission member such as a transmission shaft 50 disposed between the driven gear 47 and the nozzle assembly block 30 is provided. A gear 51 is provided at the upper end of the transmission shaft 50, and the gear 51 meshes 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 externally fitted to one end of the nozzle assembly block 30. As a result, when the servo motor 41 is actuated to rotate the block driving shaft 40, the rotation about the vertical axis is transversal via the gears 46, 47, 48, the gears 51, 52 of the transmission shaft 50 and the bevel gear 53. The block drive mechanism is configured so as to be transmitted to the nozzle assembly block 30 while being converted to rotation around the axis.

  As shown in FIG. 3, the nozzle assembly block 30 has a set screw 39 screwed into a screw hole 30 b of the block 30 through a through hole provided in the bevel gear 53, and the tip of the nozzle assembly block 30 has the horizontal shaft 37. It is fixed to the horizontal shaft 37 by being pressed against the horizontal axis 37. Therefore, when the set screw 39 is loosened and its tip is retracted to the outside of the through hole 30a, the horizontal shaft 37 can be pulled out of the holder 35 and the nozzle assembly block 30. As shown in FIG. The nozzle assembly block 30 can be removed from the holder 35.

  The nozzle assembly block 30 is formed with mutually independent passages 56 (first negative pressure supply passage of the present invention) for supplying negative pressure to the nozzles 31 and 32, respectively. Each of the passages 56 communicates with the nozzles 31 and 32 by opening one end side into the recess 33, while the other end is on the end surface (the right end surface in FIG. 3) of the nozzle assembly block 30. The openings are arranged side by side. Specifically, the openings are arranged in the circumferential direction at equal intervals on the concentric circles of the through holes 30a. Of these passages 56, the passages 56 corresponding to the nozzles 31 and 32 disposed at the use position are connected to the negative pressure supply source. That is, the end face of the nozzle assembly block 30 and the inner surface of the leg portion 35a of the holder 35 are provided so as to be in sliding contact with each other, and the passage 57 (the first aspect of the present invention) communicates with the holder 35 to the passage 22a in the sub shaft 21b. 2 negative pressure supply passages), and this passage 57 opens on the inner surface of the leg portion 35a. Of the passages 56, only the passages 56 corresponding to the nozzles etc. 32 arranged at the use position coincide with the passages 57 of the holder 35, whereby the nozzles etc. arranged at the use positions among the passages 56, etc. Only the passages 56 corresponding to 31 and 32 are connected to the negative pressure supply source through a passage 57 on the holder 35 side.

  An air filter 75 for preventing suction of foreign matter or the like to the negative pressure supply source is attached to the opening portion of each passage 56 in the end face of the nozzle assembly block 30. This air filter has, for example, a mesh-shaped capturing surface inside an annular frame, and is formed in the opening portion of each passage 56 at the end surface of the block 30 as shown in an exploded view in FIG. It is inserted into the concave portion 56a (corresponding to the insertion concave portion of the present invention). Specifically, the air filter 75 is inserted into the recess 56a in a state where it abuts against the inner end of the recess 56a, and an annular presser member 76 and an O-ring 77 are arranged so as to overlap the outside of the air filter 75. The recesses 56a are inserted in order. As a result, the air filter 75 is held in the recess 56 a by the elastic force of the O-ring 77, and when the negative pressure for component suction is supplied, the gap between the nozzle assembly block 30 and the holder 35 is sealed by the O-ring 77. As a result, the passages 56 and 57 of the nozzle assembly block 30 communicate with each other without a gap.

  Of the passages 56, the passage 56 corresponding to the nozzle holder 32 communicates with the through hole 30a as shown in FIG. 3 for space reasons, and indirectly through the through hole 30a into the nozzle holder 32. It is provided so that it may communicate with.

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

  The air cylinder 62 is disposed above the nozzle assembly block 30. A piston 63 integral with the positioning member 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 passages 65 and 66 communicate with the passage 45 in the shaft 40 for driving the block. On the other hand, the pressure chamber 67 above the piston 63 in the air cylinder 62 is open to the atmosphere, and a spring 68 is disposed in the chamber 67. When the air pressure is not supplied to the pressure chamber 64, the piston 63 is biased to the lowered position by the spring 68, whereby the positioning member 61 engages with the engagement hole 60, while the air enters the pressure chamber 64. When supplied, the piston 63 rises against the spring force of the spring 68, whereby the positioning member 61 is detached from the engagement hole 60.

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

  Further, as shown in FIG. 3, the lock mechanism for locking the displacement in the longitudinal axis direction of the nozzle assembly block 30 with respect to the nozzle shaft 21 is an upper pressure chamber fixed to the lower end of the nozzle shaft 21 via a passage constituting member 73. Pressure chamber formed between the component member 71 (the passage component member 73 and the upper pressure chamber component member 71 may be integrated) and the lower pressure chamber component member 72 fixed to the holder 35 by screw connection. 70. 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 moved to the nozzle as the nozzle 31 comes into contact with the component. The shaft 21 is displaced upward relative to the shaft 21 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 projects into the lower pressure chamber constituting member 72, and the inner space of the lower pressure chamber constituting member 72 communicates with the passage 57 formed in the holder 35. ing. That is, the negative pressure for component adsorption is introduced into the passage 57 through the inside of the passage 22a, the passage constituting member 73, and the lower pressure chamber constituting member 72 of the sub shaft 21b. The passage member 73 and the lower pressure chamber member 72 are integrated by screw connection.

  According to the mounting machine of the present embodiment as described above, as the component mounting operation, first, the head unit 5 moves to the component supply unit 4, where the head 20 descends and the component is adsorbed by the nozzle 31 at the lower end position. Then, the head 20 is raised. At this time, a valve provided between the negative pressure supply source and the passage 22a in the sub shaft 21b is opened, and the passage 22a inside the sub shaft 21b, the passage constituting member 73, the lower pressure chamber constituting member 72, The negative pressure for component suction is supplied to the nozzle 31 at the use position through the passage 57 of the holder 35 and the passage 56 of the nozzle assembly block 30, thereby sucking the component by the nozzle 31 arranged at the use position. Is done. In this case, foreign matters and dust may be sucked when the components are attracted, but these foreign matters and the like are captured by the air filter 75 provided in the passage 56, and thereby foreign matters and dust are collected in the passage 22a and the like inside the sub shaft 21b. It is possible to prevent the occurrence of a situation in which dust is clogged and hinders the adsorption of parts, or foreign matters are brought to the negative pressure supply source to cause troubles.

  When the components are picked up, 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 is lowered and picked up by the nozzles 31. The parts thus mounted are mounted on the printed circuit board 3.

  In such component mounting operation, the nozzle 31 to be used is changed according to the component to be mounted. Specifically, first, a valve provided between the air supply source and the passage 45 in the block driving shaft 40 is opened, and the passage 45 in the block driving shaft 40, the holder 35, and the bridge member 44 are opened. When the air is supplied to the air cylinder 62 through the passages 65 and 66 formed inside the positioning member 61, the positioning member 61 is detached from the engagement hole 60. Next, the servo motor 41 is actuated to rotate the block driving shaft 40, and the nozzle assembly block 30 is rotated along with the rotation, whereby the desired nozzles 31 and 32 are arranged at the use positions. Thereafter, the supply of air to the air cylinder 62 is stopped, and the positioning member 61 engages with the engagement hole 60, whereby the change of the nozzle 31 is completed. In this state, the shaft 40, the gear 46, the gear 47 that meshes with the gear 46, and the gear 48 that is loosely fitted to the holder 35 fixedly integrated with the gear 47 are allowed to rotate freely. Accordingly, the nozzle holder 35 and the nozzle 31 can be integrally rotated in the R-axis in response to the R-axis rotation of the nozzle shaft 21, and the components sucked by the nozzle 31 can be positioned around the R-axis.

  In such a series of mounting operations, maintenance of the air filter 75 is performed for a specific period or for a specific number of production boards. Maintenance is performed with the nozzle assembly block 30 removed from each head 20. Specifically, the nozzle assembly block 30 is removed from the holder 35 by loosening the set screw 39 and withdrawing the horizontal shaft 37 from the holder 35, and the O-ring 77 and presser that are inserted into the respective recesses 56a on the block end surface. The member 76 and the air filter 75 are sequentially removed. Then, the air filter 75 is cleaned or replaced with a new one, and then the nozzle assembly block 30 is returned to the head 20 in the reverse procedure to the above. By periodically maintaining the air filter 75 in this manner, it is possible to prevent the negative pressure from being lowered due to the clogging of the air filter 75 and to maintain an appropriate component suction operation.

  As described above, in this mounting machine, each head 20 includes the nozzle assembly block 30 in which a plurality of nozzles 31 and 32 are arranged around the nozzles, and the nozzles 31 and 32 correspond to the rotation of the nozzle assembly block 30. In the mounting machine configured to advance the mounting process while switching the air filter 75 is provided in the negative pressure supply passage 56 corresponding to each nozzle 31, 32 of the nozzle assembly block 30. Even when the nozzles 31 and 32 are used, trouble due to suction of foreign matters, that is, the passage 22a inside the sub shaft 21b etc. is clogged with foreign matter and dust, causing troubles in adsorbing parts, or foreign matter is generated in the negative pressure supply source. It is possible to prevent the occurrence of a situation such as being carried and causing trouble.

  Moreover, since the recess 56a is provided at the end portion of each passage 56 on the end face of the nozzle assembly block, and the air filter 75 is inserted therein, the nozzle assembly block 30 is even removed from the head 20 as described above. Then, the maintenance of the air filter 75 can be performed without removing the nozzles 31 and 32 from the nozzle assembly block 30. Therefore, compared with the configuration in which an air filter is provided for each nozzle as described in the prior art, maintenance of the air filter 75 can be promptly advanced because it is not necessary to remove the nozzles 31 and 32. Yes, and thereby high maintenance performance can be achieved.

  Further, each passage 56 can be cleaned by blowing air from the recess 56a side while the nozzles 31 and 32 are assembled to the nozzle assembly block 30, and air is blown from the tip side of each nozzle 31 and 32. The nozzles 31 and 32 can be cleaned.

  In this mounting machine, since the negative pressure is supplied by communicating the passage 56 on the nozzle assembly block 30 side and the passage 57 on the holder 35 side, the nozzle assembly block 30 and the holder 35 (leg portion 35a) In order to prevent leakage of negative pressure by sealing the gap between the two, a mounting member for this purpose, that is, an O-ring 77 is inserted into the concave portion 56a and the seal is inserted. While achieving the effect, the air filter 75 is configured to be pressed and fixed to the back end portion of the recess 56a using the elasticity of the O-ring 77. Therefore, there is also an advantage that a rational configuration in which the seal member (O-ring 77) is also used as a member for fixing the air filter 75 is achieved.

  Next, a mounting machine according to a second embodiment of the present invention will be described with reference to FIGS. The mounting machine according to the second embodiment has the same configuration as that of the first embodiment except for the points described below. Therefore, in the following description, parts common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences are described in detail.

  FIG. 6 shows a main part of the head 20 in a cross-sectional view, and FIG. 7 shows an enlarged view of a portion indicated by symbol B in FIG. 6 (connecting portion of the negative pressure passage).

  As shown in these drawings, the mounting machine according to the second embodiment has a configuration in which the air filter 75 is provided on the holder 35 side. In this respect, the configuration is different from the first embodiment. Yes. Specifically, a concave portion 57a (corresponding to the insertion concave portion of the present invention) is formed at the end portion of the passage 57 in the holder 35 (leg portion 35a), and the air filter is in a state of being abutted against the back end portion of the concave portion 57a. 75 is inserted into the recess 57a, and an annular pressing member 76 and an O-ring 77 are inserted into the recess 57a in this order so as to overlap the outside of the air filter 75. As a result, the air filter 75 is held in the recess 57 a by the elastic force of the O-ring 77, and when the negative pressure for component suction is supplied, the gap between the nozzle assembly block 30 and the holder 35 is sealed by the O-ring 77. As a result, the passages 56 and 57 of the nozzle assembly block 30 communicate with each other without a gap.

  According to the second embodiment, the basic function and effect are the same as those of the first embodiment. However, only one air filter 75 is required for the plurality of nozzles 31 and 32, that is, the air filter 75 is made common to each passage 56 on the nozzle assembly block 30 side. Therefore, there is an advantage that a more rational configuration can be achieved and the maintainability of the air filter 75 can be further improved.

  In addition, the mounting machine demonstrated above is an illustration of preferable embodiment of the surface mounting machine based on this invention, The concrete structure can be changed suitably. For example, in the above embodiment, the nozzles 31 and 32 are provided on the outer peripheral surface of the drum-shaped nozzle assembly block 30 supported around the horizontal axis 37. The present invention is also applied to a configuration in which nozzles and the like are arranged in the circumferential direction on the lower surface of a disk-shaped nozzle assembly block, for example, and the nozzles are switched in accordance with rotation about the vertical axis of the nozzle assembly block. Is possible.

It is a top view which shows roughly the whole structure of the surface mounting machine which concerns on the 1st Embodiment of this invention. FIG. 2 is a front view (partially sectional view) showing a configuration of a head unit in the surface mounter of FIG. 1. It is principal part front sectional drawing which shows the structure of a head. It is a disassembled sectional view of the head which shows the state which removed the nozzle assembly block. It is A arrow line view of FIG. 4 which shows the structure of a nozzle assembly | attachment block. It is principal part front sectional drawing which shows the structure of the head of the surface mounting machine which concerns on 2nd Embodiment. FIG. 7 is an enlarged view of a portion B in FIG. 6.

Explanation of symbols

5 Head unit 20 Head 21 Nozzle shaft 31 Nozzle 32 Nozzle holder 35 Holder 35a Leg portion 37 Horizontal axis 56 Passage (first negative pressure supply passage)
56a recess (insertion recess)
57 passage (second negative pressure supply passage)
75 Air filter 76 Presser member 77 O-ring (seal member)

Claims (1)

A nozzle assembly block in which a plurality of nozzles are arranged in the circumferential direction is rotatably supported by the block support portion of the mounting head, and the nozzle assembly block has a plurality of independent first negative pressures communicating with the respective nozzles. While the supply passage is provided, the block support portion is provided with one second negative pressure supply passage leading to a negative pressure supply source, and the nozzle is placed at a predetermined working position as the nozzle assembly block rotates. By being arranged, only the first negative pressure supply passage corresponding to the nozzle communicates with the second negative pressure supply passage so that negative pressure for component suction can be supplied to the nozzle. In the configured surface mounter,
An insertion recess for mounting an air filter is provided in a terminal opening portion on the negative pressure outlet side of the second negative pressure supply passage in the block support portion, and the air filter is mounted in the insertion recess. A seal member for sealing a gap between the nozzle assembly block and the block support portion is inserted around the first and second negative pressure supply passages on the inlet side of the insertion recess from the air filter. The surface mounter is characterized in that the air filter is prevented from coming off with respect to the insertion recess .

Images