JP4136813B2 - Electronic component mounting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic component mounting apparatus that vertically drives a plurality of mounting heads with a single driving source.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an electronic component mounting apparatus that automatically mounts electronic components such as ICs, transistors, capacitors, and resistors on a printed circuit board and solders the mounted components to the printed circuit board is known.
[0003]
Such an electronic component mounting apparatus includes a head support portion that can move in the X-axis direction (left-right direction) and the Y-axis direction (front-rear depth direction), and a Z-axis direction (up-down direction) supported by the head support portion. The work head is movable and rotatable in the θ-axis direction (360 ° direction). That is, a work head that is displaceable in the X, Y, Z, and θ directions is provided, and an electronic component is sucked by a nozzle that is detachably attached to the tip of the work head.
[0004]
When mounting an electronic component on a printed circuit board, the work head is moved above the component supply device, the electronic component accommodated in the component supply device is sucked by the nozzle, and the work head is mounted on the desired component on the printed circuit board. It is moved to the position and the electronic component sucked by the nozzle is mounted on the printed board.
[0005]
In the conventional electronic component mounting apparatus as described above, for example, in an electronic component mounting apparatus having a rotary type work head, a motor as a Z-direction drive source is provided to each of a plurality of work heads rotating along the circumference. In the vertical movement, a plurality of working heads are individually driven by respective driving sources.
[0006]
[Problems to be solved by the invention]
However, in the above vertical drive system, when the number of work heads arranged on one head support portion is increased in order to improve the mounting tact of the electronic component mounting apparatus, it is necessary to increase the vertical drive sources as well. is there. If it does so, those arrangement | positioning space will be needed for the part which increased the drive source, and the weight of a head support part will also increase.
[0007]
In addition to the increase in manufacturing cost due to the increase in peripheral devices, not only does the structure of the head support increase, but the strength of the moving drive system in the X and Y directions increases as the weight increases. As a whole, the main unit is increased in size, and from this point, a further increase in manufacturing cost is inevitable.
[0008]
In view of the above-described conventional situation, an object of the present invention is to provide an electronic component mounting apparatus that includes a rotary work head and has a lightweight head support structure.
[0009]
[Means for Solving the Problems]
The configuration of the electronic component mounting apparatus according to the present invention will be described below.
An electronic component mounting apparatus according to the present invention is an electronic component mounting apparatus having a rotary work head on a head support portion, and each of a plurality of work heads rotatably disposed on a circumferential portion in the head support portion. The number of drive sources is smaller than the number of the plurality of work heads for driving.
[0010]
In this electronic component mounting apparatus, for example, as described in claim 2, the circumferential portion is composed of two annular plates that are vertically opposed to each other and each have a notch at a part of the same position. The working head includes a bearing protruding perpendicularly to the vertical axis, and the bearing is rotatably sandwiched between the two annular plates of the circumferential portion, and the drive source includes the circumferential portion A bearing holding portion which is composed of two upper and lower plate members corresponding to the notch portions of the two annular plates and is driven up and down by one motor, and the bearing of the desired working head is provided by the bearing holding portion. It is comprised so that it may be clamped.
[0011]
The drive source is spanned between, for example, a drive pulley provided in the motor, a belt tension pulley, and the belt tension pulley and the motor drive pulley. And a bearing clamping portion fixed to the belt. For example, as in claim 4, the number is one.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1A is a diagram showing an internal structure of an electronic component mounting apparatus according to an embodiment, and FIG. 1B is an enlarged view of main components of the head support portion. As shown in FIG. 1A, the electronic component mounting apparatus 1 includes guide rails 2 and 3 for guiding the conveyance of the printed board. Although not shown in the figure, these guide rails 2 and 3 convey the printed circuit board inserted from the left direction of FIG. 1 (a) to a predetermined position, and when the mounting of electronic components is completed, the printed circuit board is moved to the right side. A belt transport mechanism for transporting in the direction is provided.
[0013]
The printed circuit board inserted from the left direction in Fig. 11 (a) is transported to a predetermined position by the belt transport mechanism, fixed in position by a positioning unit (not shown), and fixed by the positioning unit when mounting of the electronic components is completed. Is released, and the belt is transported to a device that executes the next step by the belt transport mechanism.
[0014]
The electronic component mounting apparatus 1 includes four head support portions 4 to 7 that are movable in the X-axis and Y-axis directions. The head support parts 4 and 5 are movably suspended by two X axis drive parts 9 arranged in parallel, and the X axis drive part 9 is respectively attached to ball screws 8 a and 8 b inside the Y axis drive part 8. Engage with a ball nut (not shown).
[0015]
The ball screws 8 a and 8 b are driven by a Y-axis motor that is not visible in FIG. 1A, so that the X-axis drive unit 9 moves in the Y-axis direction along the longitudinal direction of the Y-axis drive unit 8. The head support parts 4 and 5 move in the X-axis direction along the X-axis drive part 9 by the forward and reverse rotation of the X-axis drive motor of the X-axis drive part 9.
[0016]
Similarly to the head support portions 4 and 5, the head support portions 6 and 7 can also be moved in the Y-axis and X-axis directions by the Y-axis drive portion 10 and the X-axis drive portion 11. That is, the head support parts 4 to 7 are movable in the X-axis direction and the Y-axis direction via the X-axis drive part 9 or 11 and the Y-axis drive part 8 or 10.
[0017]
As shown in the enlarged view of FIG. 4B, each of the head support portions 4 to 7 described above includes six work heads 12 (12a, 12b, 12c, 12d, 12e, and 12f). Each of the work heads 12 is removably attached with a nozzle (see FIG. 4 to be described later) for adsorbing an electronic component at the tip thereof, and can be rotated 360 ° on the XY plane, respectively. The Z-axis drive mechanism 13 can move up and down in the Z-axis direction (vertical direction in the figure). The operations of the Z-axis drive mechanism 13 and the work head 12 will be described in detail later.
[0018]
In the electronic component mounting apparatus 1 shown in FIG. 1 (a), a large number of tape-type component supply devices including reel cartridges or the like on which tapes containing electronic components are mounted are mounted on the component supply stages 14 and 15.
The photographing unit 16 including a camera and a lighting device photographs the electronic component sucked by the nozzle of the work head 12 from below. An image of the captured electronic component is image-recognized by a control unit, which will be described later, and the orientation of the electronic component is corrected by controlling the rotation angle of the work head 12 based on the image recognition result.
[0019]
Although not shown in FIG. 1, the electronic component mounting apparatus 1 is provided with a nozzle changer in which a plurality of replacement nozzles are arranged, and the working head moves to above the nozzle changer. The nozzles adapted to the shape of the electronic component mounted on the printed circuit board are selectively replaced.
[0020]
FIG. 2 is a diagram illustrating a main part of the system circuit of the electronic component mounting apparatus 1. The Y-axis motor unit 17 is a motor drive unit that moves the head support units 4 to 7 in the Y-axis direction, and a plurality of motors are provided in the Y-axis drive units 8 and 10.
The X-axis motor unit 18 is a motor drive unit that moves the head support units 4 to 7 in the X-axis direction, and a plurality of motors are provided in the X-axis drive units 9 and 11.
[0021]
The Z-axis motor unit 19 is a motor drive unit for individually raising and lowering the six work heads 12 attached to the head support units 4 to 7 in the Z-axis direction. The motor is a head support unit 4 to 7. One is provided.
The rotary motor unit 20 constitutes a drive system 13 for the six work heads 12 of the head support units 4 to 7 together with the Z-axis motor unit 19 described above. The drive unit of the circumferential rotation motor and the drive of the individual rotation motor Consists of parts. The circumferential rotation motor is a motor that rotates the circumferential portion of the six work heads 12 integrally on the XY plane in order to position the desired work head 12 up and down in the Z-axis direction by the Z-axis motor 19. is there. The individual rotation motor is a motor that individually controls the rotation angle of the work head 12 by rotating the individual work head 12 independently on the XY plane. This is performed by the rotation of the rotation motor.
[0022]
3A is a side view showing the tip portions of the working heads 12a to 12f shown in FIG. 1B together with the nozzles. FIG. 3B is a plan view showing the working heads 12a to 12f in the downward direction (printed circuit board). It is the figure seen from the electronic component mounting surface side.
Nozzles 23 (23a, 23b,..., 23f) are attached to the front ends of the work heads 12a to 12f, respectively. The nozzle 23a is detachably held by the nozzle holding part 24 of the work head 12a. The same applies to the other nozzles 23b to 23f.
[0023]
When the work heads 12a to 12f are rotated at a predetermined angle, for example, 120 °, by the circumferential rotation motor described in the rotary motor unit 20 shown in FIG. 2, the center axes of the two adjacent work heads 12 are aligned. The connecting line is arranged so as to be parallel to the arrangement direction of the components of the component supply device. And it arrange | positions so that the pitch of the nozzle 23 of the two adjacent work heads 12 may correspond with the arrangement pitch of the components of a components supply apparatus.
[0024]
3B, the central axis pitch of the nozzles 23a and 23b, the central axis pitch of the nozzles 23b and 23c, the central axis pitch of the nozzles 23c and 23d, the central axis pitch of the nozzles 23d and 23e, The pitches of the central axes of 23e and 23f and the pitch of the central axes of the nozzles 23f and 23a are arranged to coincide with the arrangement pitch of the components of the component supply device.
[0025]
FIG. 4 is a view for explaining a drive mechanism in the Z-axis direction of the working head of the head support portion, and further shows FIG. As shown in FIG. 4, the head support portion 4 is provided with a circumferential portion composed of two annular plates 25 (25a, 25b) arranged opposite to each other in the vertical direction (in the figure, the upper and lower two portions are provided). A piece of annular plate 25 is shown partially transparently to show the configuration of the part hidden behind them).
[0026]
The six work heads 12 (12a to 12f) are arranged in the annular ring of the two annular plates 25, and each include a bearing 26 protruding perpendicularly to the vertical axis in the vicinity of the upper end portion. A rotary work head is configured as a whole by being rotatably held between two annular plates 25.
[0027]
The six rotary work heads 12 are integrally rotated by a circumferential rotation motor, not shown in FIG. 4 of the rotary motor unit 20 shown in FIG.
The two annular plates 25 constituting the circumferential portion are each formed with a notch 27 (27a, 27b) at a part of the same position opposed to each other. The two upper and lower plate members 28 (28a, 28b) having shapes corresponding to the notches 27 of the two annular plates 25 in the circumferential portion are respectively fitted into the upper and lower notches 27 in the standby state. Arranged.
[0028]
Thereby, when the Z-axis drive mechanism 13 is in the standby state, the circumferential portion is completely formed by the two plate members 28a and 28b fitted into the notches 27a and 27b of the two annular plates 25a and 25b, respectively. A pair of upper and lower rings are formed, and six work heads 12 are supported by bearings 26 between the two rings, and six of them are rotated together.
[0029]
The two plate members 28 are fixed to a Z-axis drive member 29, and the Z-axis drive member 29 is fixed to a belt 30. The belt 30 is a toothed belt, and is stretched between a toothed drive pulley 32 attached to the tip of the rotating shaft of the motor 31 and a belt pulley 33 with a belt tension.
[0030]
The control unit 22 shown in FIG. 2 includes six working heads 12 that are integrally rotated by a circumferential rotation motor so that one or two desired working heads 12 (in the example shown in FIG. When only one of 12d) is located between the two plate members 28, the circumferential rotation is stopped.
[0031]
Subsequently, the control unit 22 rotates the motor 31 in any desired rotation direction. As a result, the belt 30 is driven by the toothed drive pulley 32 to rotate in either a forward or reverse direction. Then, according to either forward or reverse rotation of the belt 30, the Z-axis drive member 29 fixed and held on the belt 30 moves up and down in any desired direction.
[0032]
As a result, the two plate members 28 fixed to the Z-axis drive member 29 sandwich the bearing 26 stopped between them and move up and down in any desired direction. That is, the work head 12 having the bearing 26 moves up and down in a desired direction.
[0033]
Thus, according to the present example, the six work heads 12 are provided with only one drive source (the motor 31, the toothed drive pulley 32, the belt in the example of FIG. 4) for every desired one or two. Driving in the Z-axis direction can be performed by a pulley 33 with tension teeth, a belt 30, a Z-axis drive member 29, and a pair of drive sources including two plate members 28).
[0034]
It should be noted that the circumferential portion is set large, and the notches 27 of the annular plate 25 and the sizes of the two plate members 28 corresponding thereto are appropriately set, so that three or more work heads 12 can be held simultaneously. May be moved up and down. In this case, the number of work heads forming the rotary work head need not be limited to six, and may be any number of seven or more as long as the number can be designed. In some cases, it may be 5 or less.
[0035]
Further, when the number of work heads is large and the rotary is large, a plurality of Z-axis drive mechanisms may be used without being limited to one Z-axis drive mechanism. In any case, all desired work heads can be driven in the Z-axis direction with a smaller number of Z-axis drive mechanisms than the number of all work heads forming the rotary type.
[0036]
【The invention's effect】
As described above, according to the present invention, a plurality of work heads arranged in a rotary type are connected to all desired work heads with a number of Z-axis drive mechanisms smaller than the total number of the plurality of work heads. Since it can be driven in the direction, it is possible to provide an electronic component mounting apparatus that is lightweight and small in the configuration of the head support portion despite the rotary configuration.
[Brief description of the drawings]
FIG. 1A is a view showing an internal structure of an electronic component mounting apparatus according to an embodiment, and FIG. 1B is an enlarged view of main components of the head support portion.
FIG. 2 is a diagram illustrating a main part of a system circuit of the electronic component mounting apparatus according to the embodiment.
3A is a side view showing a tip portion of a working head together with a nozzle, and FIG. 3B is a view seen from below (on the electronic component mounting surface side of a printed circuit board).
FIG. 4 is a view for explaining a drive mechanism in the Z-axis direction of the working head of the head support portion, and is a further enlarged view of FIG. 1 (b).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 2, 3 Guide rail 4, 5, 6, 7 Head support part 8, 10 Y-axis drive part 9, 11 X-axis drive part 12 (12a, 12b, 12c, 12d, 12e, 12f) Work head 13 Z-axis drive mechanism 14, 15 Component supply stage 16 Imaging unit 17 Y-axis motor 18 X-axis motor 19 Z-axis motor 20 Rotating motor 21 Imaging unit 22 Control unit 23 (23a, 23b, ..., 23f) Nozzle 24 Nozzle Holding portion 25 (25a, 25b) Ring-shaped plate 26 Bearing 27 (27a, 27b) Notch portion 28 (28a, 28b) Plate member 29 Z-axis drive member 30 Belt 31 Motor 32 Toothed drive pulley 33 With belt tensioning teeth Pulley

Claims (1)

An electronic component mounting apparatus having a rotary work head on a head support,
A circumferential portion composed of two ring-shaped plates each having a notch portion at a part of the same position that are vertically opposed to each other in the head support portion ;
Is rotatably disposed in the circumferential portion, provided with a bearing which projects at right angles to the vertical axis, rotatably sandwiched a plurality of said rotary work the bearing in two annular plates of the circumference Head ,
And drive Dogen for each vertically driving the rotary working head of said plurality,
Equipped with a,
The drive source includes one motor, a drive pulley provided in the motor, a belt tension pulley, a belt stretched between the belt tension pulley and the motor drive pulley, A bearing pinching portion comprising two upper and lower plate members fixed to the belt and having a shape corresponding to the notch portions of the two annular plates on the circumferential portion;
The bearing clamping unit is driven up and down by forward / reverse rotation of the motor while clamping the bearing of the desired rotary type work head.
An electronic component mounting apparatus characterized by that.

Images