JP3115972B2 - Board transfer device for mounting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting machine for mounting chip components such as electronic components on a printed circuit board conveyed by a pair of conveying conveyors. The present invention relates to a substrate transfer device of a mounting machine in which the distance between the substrates can be adjusted.

[0002]

2. Description of the Related Art Heretofore, a chip unit such as an electronic component supplied from a component supply unit has been picked up by a head unit movable in the X-Y directions, and is conveyed by a board conveying conveyer to a predetermined work position. 2. Description of the Related Art A mounting machine adapted to mount on a printed circuit board which is positioned is known.

[0003] In this type of mounting machine, the board transfer conveyors generally have a paired structure, and the conveyors are arranged at predetermined intervals so as to be parallel to each other. In particular, recently, there has been proposed a printer capable of adjusting the interval between the respective conveyors so as to be able to transport printed boards having different sizes. For example, a substrate transport conveyor 80 shown in FIG. 7 shows one example. As shown in the figure, the substrate transport conveyor 80 has a pair of conveyors 81a and 81b that are parallel to each other.
The printed circuit board P is conveyed in the direction indicated by a white arrow by 0a and 80b. Each conveyor 80a, 80
A pair of mutually parallel ball screw shafts 82a and 82b extending in a direction orthogonal to these are rotatably disposed below b. The ball screw shafts 82a and 82b are provided on the one-side conveyor 80a. A pair of nut members 83
a and 83b are screwed respectively. Each of the ball screw shafts 82a and 82b has a pulley 8
4a and 84b are attached, and these pulleys 84a and 8
4b, a synchronous belt 85 is attached, and on one ball screw shaft 82a (the left side in FIG. 7), a pulley 86 arranged in parallel with the pulley 84a and a pulley 87 attached to the output shaft of the drive motor 89. A drive belt 88 is mounted between the two.

That is, in the substrate transport conveyor 80, the rotational driving force of the drive motor 89 is transmitted to one ball screw shaft 82a by the pulleys 86, 87 and the drive belt 88, and the pulleys 84a, 84b
And the other ball screw shaft 82b via the synchronous belt 85
Is transmitted to And by this, each ball screw shaft 82
Are rotated synchronously, and one conveyor 81a is moved toward and away from the other conveyor 81b in a state in which the conveyor 81a approaches and separates from the other conveyor 81b.

[0005]

By the way, the following problems have conventionally occurred in the above-described board transfer conveyor 80.

[0006] First, in the substrate transport conveyor 80,
Since the nut members 83a and 83b of the conveyor 81a are screwed to the ball screw shafts 82a and 82b, and the conveyor 81a moves along these ball screw shafts 82a and 82b, smooth movement of the conveyor 81a is ensured. For this purpose, the parallelism between the ball screw shafts 82a and 82b is regarded as important, and high precision is required in terms of design and manufacturing of the substrate conveyor 80.

Further, as described above, the ball screw shafts 82a, 82a,
Since the roller 82b also functions as a so-called guide member of the conveyor 81a, the ball screw shafts 82a and 82b inevitably require high rigidity to support the conveyor 81a. Will be raised. At this time, it is conceivable to provide a guide member separately, but in such a case, as described above, high precision parallelism between the guide member and each of the ball screw shafts 82a and 82b is required.

Further, in the above-mentioned substrate transporting conveyor 80, a synchronous belt 85 is applied to each of the ball screw shafts 82.
The rotation speeds of a and 82b are synchronized.
Due to the thermal expansion and contraction of the synchronous belt 85, each ball screw shaft 82
When such a situation occurs, a rotational speed error is likely to occur between the conveyors 81a and 82b, so that not only the parallelism between the conveyors 81a and 81b is impaired, but also the proper movement of the conveyor 81a is hindered. For example, wear of the threaded portion between the nut members 83a, 83b and the ball screw shafts 82a, 82b becomes severe.
It is extremely inconvenient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a board transfer device of a mounting machine capable of ensuring the movement of each conveyor at the time of adjusting a conveyor interval without requiring high precision. It is intended to provide.

[0010]

SUMMARY OF THE INVENTION The present invention provides a pair of transport conveyors which are arranged in parallel on a base at a predetermined interval and extend in the transport direction of a printed board, and one transport conveyor is connected to the other. In a board transfer device of a mounting machine, comprising: a transfer mechanism capable of moving toward and away from a transfer conveyor, the transfer mechanism includes: a synchronous shaft extending parallel to a transfer direction of the printed board; and a transfer direction of the printed board. A plurality of guide members extending in a direction perpendicular to the direction of rotation, a plurality of drive pulleys mounted on the synchronous shaft at predetermined intervals in the direction of transport of the printed circuit board, and the print pulleys respectively corresponding to these drive pulleys. A plurality of driven pulleys disposed at predetermined intervals in a direction orthogonal to the substrate, and a timing belt mounted over each of the corresponding drive pulleys and driven pulleys; And a drive motor for rotating the synchronizing shaft, in which said one transport conveyor is coupled to each of the timing belts with mounted movably on the respective guide members.

[0011]

According to the present invention, when the drive motor is driven,
The rotational driving force is transmitted to the synchronous shaft, and the synchronous shaft and the respective drive pulleys mounted thereon are rotated integrally. Thereby, each timing belt mounted over each drive pulley and the driven pulley is operated at the same speed, and according to the operation of this timing belt, one of the conveyors connected to the timing belt is used for the other conveyor. It is moved to and away from the conveyor. According to this, since the transmission of the rotational driving force to each timing belt is performed by the synchronous shaft, a difference in the operation amount between the timing belts hardly occurs. In addition, since the conveyor is moved along the guide member with the rotation of the timing belt, even if the parallelism between the timing belts is not maintained to a certain degree, the slight deviation of the parallelism may cause the timing belt to be out of alignment. The transport conveyor moves smoothly along the guide member while being absorbed by the flexibility of the belt.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a substrate transfer apparatus according to an embodiment of the present invention.

FIG. 1 is a schematic view showing the entire structure of a mounting machine to which the substrate transfer apparatus of the present invention is applied. As shown in FIG.
On the base 1 of the mounting machine, a substrate transport conveyor 2 described in detail later is arranged, and the printed circuit board P is transported on the substrate transport conveyor 2 and stopped at a predetermined work position. I have.

A component supply unit 4 is arranged on the side of the substrate transport conveyor 2. The component supply unit 4 includes a plurality of rows of tape feeders 4a. Each of the tape feeders 4a stores and holds small chip components such as ICs, transistors, and capacitors at predetermined intervals. As it comes out, a tape feeding end is equipped with a ratchet type feed mechanism,
The tape is intermittently fed out as chip components are picked up by a head unit 5 described later.

A head unit 5 for mounting components is mounted on the base 1 and above the substrate transport conveyor 2. The head unit 5 is movable in the X-axis direction (the direction of the substrate transport conveyor 2) and the Y-axis direction (the direction orthogonal to the X axis on a horizontal plane).

That is, a pair of support members 6a and 6b are installed on the base 1 in the X-axis direction.
A pair of fixed rails 7 extending in the Y-axis direction and a ball screw shaft 8 driven to rotate by a Y-axis servomotor 9 are arranged on 6b, and a head unit support member 11 is arranged on the fixed rails 7 A nut portion 12 provided on the support member 11 is screwed to the ball screw shaft 8.
A guide member 13 extending in the X-axis direction and a ball screw shaft 14 driven by an X-axis servomotor 15 are disposed on the support member 11 so that the head unit 5 can move on the guide member 13. A nut portion (not shown) provided in the head unit 5 is screwed to the ball screw shaft 14. The ball screw shaft 8 is rotated by the operation of the Y-axis servo motor 9 to move the support member 11 in the Y-axis direction, and the ball screw shaft 14 is rotated by the operation of the X-axis servo motor 15, thereby causing the head unit to rotate. 5 moves in the X-axis direction with respect to the support member 11.

Although not shown in detail, the head unit 5 has a nozzle member 1 for adsorbing chip components.
6 are provided. In the illustrated embodiment, three nozzle members 16 are provided, and each nozzle member 16 moves in the Z-axis direction (vertical direction) and the R-axis direction (around the nozzle center axis) with respect to the frame of the head unit 5. It is possible to rotate. A negative pressure supply means (not shown) is connected to each nozzle member 16 via a valve or the like.
In other words, a required negative pressure for component suction is supplied to the nozzle member 16 when the chip component is suctioned.

FIGS. 2 to 5 show the above-mentioned substrate transfer conveyor 2.
Schematically shows the structure of

As shown in these figures, a board conveying conveyor 2 is composed of a pair of conveyors 2 arranged in parallel with each other.
a, 2b, and each of the conveyors 2a, 2b is
Frames 20a, 20b extending in the X-axis direction, and drive pulleys 21a, 2 held by the frames 20a, 20b
1b, idle pulleys 22 to 28, and transport belts 29a and 29b stretched over these pulleys. Each of these conveyors 2a, 2b is disposed on the base 1 in a state of being inserted into a hollow portion formed in the support members 6a, 6b as shown in FIG. 5, and one of these conveyors 2a, 2b is provided. Of conveyors can be moved toward and away from the other conveyor. In the embodiment, the conveyor 2b (upper conveyor in FIG. 2) can be moved toward and away from the conveyor 2a.

That is, as shown in FIG. 2, a pair of fixed rods 17 extending in the Y-axis direction and parallel to each other are disposed on each of the support members 6a and 6b, and the conveyor 2b is mounted on the fixed rods 17. The conveyor 2a is fixed slidably and fixed. More specifically, as shown in FIGS. 3 and 4, the conveyors 2a and 2b have a pair of brackets 3 at the lower ends of the frames 20a and 20b.
2a and 32b are projected, respectively, and the conveyor 2a inserts the fixing rod 17 into the bracket 32a,
While the fixing rod 17 is clamped and fixed to the fixing rod 17, the conveyor 2 b is fixed to the bracket 32.
b is slidably mounted on the fixed rod 17 via a bearing 33 mounted on the mounting rod b.

A synchronous shaft 1 extending in the X-axis direction between the support members 6a and 6b is provided below the conveyor 2a.
8 is rotatably supported. This synchronous shaft 18
A pulley 34 is provided at the base end (the left end in FIGS. 1 and 2).
A drive belt 37 is mounted over the pulley 34 and a pulley 36 attached to an output shaft of a drive motor 35 fixed to the support member 6a. A pair of synchronous pulleys 38 are mounted on the synchronous shaft 18 at predetermined intervals in the longitudinal direction thereof, and each of the support members 6
A driven pulley 39 is rotatably supported by a and 6b so as to correspond to the synchronous pulley 38, respectively. A timing belt 40 is wound around each of the pulleys 38 and 39, and any one of the timing belts 40 is connected to the lower end of the bracket 32b of the conveyor 2b. Specifically, as shown in FIG. 4, the lower end of the bracket 32b
The timing belt 40 is firmly held by the plate member 41 attached thereto, so that the timing belt 40 is connected to the bracket 32b.

When the drive motor 35 is driven, its rotational driving force is transmitted to the synchronous shaft 18 via a pulley 36, a drive belt 37 and a pulley 34, and a timing belt corresponding to the rotation of the synchronous shaft 18 is driven. 40
5, the conveyor 2b moves toward and away from the conveyor 2a along the fixed rod 17 as shown by the solid line and the two-dot chain line in FIG. I have.

The driving pulleys 2 of the conveyors 2a, 2b
1a and 21b are driven by a drive motor 30 for conveyance fixed to the support member 6b via a drive shaft 30a. That is, the drive pulleys 21a, 21
b is located at one end of the frames 20a and 20b (the right end in FIGS. 3 and 4).
The drive shaft 30a is fixed to shafts 31a and 31b rotatably mounted on the shaft b, and is connected to the output shaft of the drive motor 30 via a coupling or the like.
b. Then, the shafts 31a, 31b
And the drive shaft 30a are coupled such that only relative movement in the axial direction is permitted.

As shown in FIG. 2, a plate member 43 is mounted substantially at the center of the conveyors 2a and 2b in the X-axis direction, and a main stopper device 44a and a sub-stopper are provided beside the conveyor 2a. The device 44b is arranged at a predetermined interval in the X-axis direction.

The plate member 43 is connected to the frame 20.
The upper portions of the transport belts 29a and 29b are fixed to the upper ends of the transport belts 29a and 29b. The plate member 4 attached to the conveyor 2a
3, bulging portions 43a and 43b are provided at positions corresponding to the stopper devices 44a and 44b.

As shown in FIG. 6, the main stopper device 44a comprises an air cylinder 45 attached to the frame 20a of the conveyor 2a via a support plate 49, and a stopper member 46 attached to the tip of the rod. In response to the supply and discharge of air pressure to and from the air cylinder 45, the stopper member 46 is raised and lowered between the solid line position and the two-dot chain line position in FIG. A rod 47 is attached to the stopper member 46.
Is attached by screwing or the like. The rod 47 is inserted into a perforated portion formed in the support plate 49, and the tip 47 a of the rod 47 projects to the upper surface of the stopper member 46. Have been. That is, when the stopper member 46 is moved up and down by the operation of the air cylinder 45, the rod body 47 functions as a guide member, and when the stopper member 46 is moved up, as shown in FIG. By protruding into the perforated portion 48 formed in the bulging portion 43a of the plate member 43, it functions as a positioning member. Although not described, the sub-stopper device 44b has the same configuration as the main stopper device 44a.

Next, the operation of the mounting machine configured as described above will be briefly described.

First, when the mounting operation is started, each of the transport belts 29a and 29b is rotated by the drive of the drive motor 30, and the printing belt supplied to the substrate transport conveyor 2 from a substrate supply unit (not shown). The substrate P is transported. At this time, the stopper member 46 of the main stopper device 44a is held at the raised position indicated by the two-dot chain line in FIG. Then, when the leading end portion of the printed circuit board P comes into contact with the stopper member 46 with the conveyance, a pressing member (not shown) presses the printed circuit board P from below the printed circuit board P at that timing, whereby the printed circuit board P It is configured to be held in a state pressed against the lower surface of the member 43. That is, the printed circuit board P is positioned at a predetermined work position. At the same time or at a timing synchronized with this, the stopper member of the other sub-stopper device 44b is raised, so that the subsequent conveyance of the printed circuit board Pa is prevented.

When the printed circuit board P is positioned as described above, the head unit 5 is moved above the component supply unit 4 by driving the X-axis servo motor 15 and the Y-axis servo motor 9, and the components are moved. The nozzle member 16 to be sucked is lowered, and a desired chip component is sucked from the tape feeder 4a to be raised. Thereafter, by driving the servo motors 9 and 15 again, the head unit 5 is moved to a position, not shown, at which the component inspection apparatus is disposed on the base 1, and the chip components adsorbed here are moved. Is inspected. When the inspection is completed, the head unit 5 is moved onto the printed circuit board P, and the nozzle member 16 that has absorbed the chip component is moved.
Is lowered, and the chip component is mounted at a predetermined component mounting position on the printed circuit board P.

On the other hand, when mounting the chip components on printed boards of different sizes in the mounting machine, the driving motor 35 is driven to rotate the pulley 36 and the driving belt 37. And pulley 3
4, the conveyor 2b approaches the conveyor 2a along the fixed rod 17 by the forward / reverse rotation of the timing belt 40 in accordance with the rotation of the synchronous shaft 18 as shown in FIG. In this state, the conveyors 2a and 2b are adjusted to an interval at which a required printed circuit board can be transported.

By the way, in the above-mentioned substrate transporting conveyor 2 which can change the interval between the respective conveyors 2a and 2b, the following advantages can be obtained by adopting the above configuration.

That is, in the substrate transport conveyor 2, the conveyor 2a is coupled to the pair of timing belts 40, and the conveyor 2a is moved along the fixed rod 17 with the rotation of the timing belt 40. If the parallelism of the fixing rods 17 is ensured to a certain degree of accuracy, the smooth conveyor 2a can be used even if the parallelism between the timing belts 40 is not set to high-precision parallelism.
It is possible to secure the movement. Therefore, when the guide member is provided, it is extremely advantageous in terms of design and manufacturing as compared with a conventional substrate transfer conveyor which requires the parallelism between the guide member and the ball screw shaft to be secured with high accuracy. It has become something.

Further, in the above-mentioned substrate transfer conveyor 2, since the timing belts 40 are operated synchronously by the synchronous shaft 18, the occurrence of a difference in the operation amount between the timing belts 40 is preferably suppressed. can do. In other words, like a conventional board transfer conveyor,
When the synchronous belt is used to synchronize the rotation between the ball screws, a difference in the operation amount between the ball screws easily occurs due to the thermal expansion and contraction of the synchronous belt. However, the synchronous shaft 18 is applied as in the above embodiment. In such a case, the expansion, contraction, deformation or deterioration of the synchronous shaft 18 is substantially negligible, so that there is no difference in the operation amount of each timing belt 40. At this time, it is conceivable that a difference in the operation amount due to the expansion and contraction of each of the timing belts 40 may occur. Are the same, and it can be said that the occurrence of the difference in the operation amount between the timing belts 40 is small.

Therefore, in the substrate transport conveyor 2 of the above embodiment, in which the synchronous operation of the timing belts 40 can be preferably achieved, the conveyors 2a and 2b can be preferably kept parallel to each other, thereby making the conveyor 2a smooth. The transfer width of the substrate transfer conveyor 2 can be suitably adjusted.

The above-described board transfer conveyor 2 is an embodiment of the board transfer apparatus according to the present invention, and the specific configuration thereof is appropriately changed in addition to the above-described embodiment without departing from the gist of the present invention. It is possible. For example, in the above-mentioned substrate transfer conveyor 2, the conveyor 2a is moved along the fixed rod 17, but it is needless to say that the conveyor 2a may be moved along a rail member such as the fixed rail 7. I do not care.

[0036]

As described above, in the substrate transfer apparatus according to the present invention, when the drive motor is driven, the rotational driving force is transmitted to the synchronous shaft, and each timing belt is synchronously rotated by the rotation of the synchronous shaft. As a result, one conveyor conveyed to each timing belt is moved toward and away from the other conveyor,
The difference in the operation amount between the timing belts hardly occurs. In addition, since the conveyor is moved along the guide member with the rotation of the timing belt, even if the parallelism between the timing belts is not maintained, the conveyor can be smoothly moved along the guide member. , And the movement of each conveyor at the time of adjusting the conveyor interval can be more appropriately secured without requiring high accuracy.

[Brief description of the drawings]

FIG. 1 is a plan view showing a mounting machine to which an example of a substrate transfer device of the present invention is applied.

FIG. 2 is a plan view showing a substrate transfer device.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along line VV in FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI in FIG. 2;

FIG. 7 is a plan view showing an example of a conventional substrate transfer device.

[Explanation of symbols]

 2 Conveyor for substrate transfer 2a, 2b Conveyor 6a, 6b Support member 17 Fixed rod 18 Synchronous shaft 20a, 20b Bracket 33 Bearing 34, 36 Pulley 35 Drive motor 37 Drive belt 38 Synchronous pulley 39 Follower pulley 40 Timing belt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-103366 (JP, A) JP-A-5-55787 (JP, A) Fully open 1987-144819 (JP, U) Really open 1980 101809 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05K 13/02 B65G 21/14

Claims (1)

(57) [Claims] 1. A pair of transport conveyors arranged in parallel with each other at predetermined intervals on a base and extending in the transport direction of a printed circuit board, and one transport conveyor is moved toward and away from the other transport conveyor. And a moving mechanism that allows the moving mechanism to move the printed circuit board in a direction perpendicular to the direction in which the printed circuit board is transported. A guide member, a plurality of drive pulleys mounted on the synchronous shaft at a predetermined interval in the direction of transport of the printed circuit board, and a predetermined direction in a direction orthogonal to the printed circuit board corresponding to each of the drive pulleys. A plurality of driven pulleys arranged at intervals, a timing belt mounted over each of the corresponding drive pulley and driven pulley, and a rotation of the synchronous shaft. And a drive motor for driving the substrate, wherein the one conveyor is movably mounted on each of the guide members and is coupled to each of the timing belts.