JPH08330794A - Electronic component automatic mounting device - Google Patents

Abstract

PURPOSE: To provide an electronic component automatic mounting device, wherein cams of cam shafts where a belt is fixed are easily adjusted in phase to the input shaft of an indexing unit. CONSTITUTION: A bolt 37 is loosened, an adjustment bolt 42 is adjusted, one idler 38 is pushed up, the other idler 38 is pushed down, cam shafts are adjusted in phase to an input shaft, and then the bolt 37 is fixed by tightening. By this setup, a phase adjustment operation is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an index unit for intermittently rotating a rotary table attached to an output shaft by the rotation of an input shaft driven by a motor, and an input shaft pulley provided on the input shaft. A timing belt hung around a cam shaft pulley provided on a cam shaft having a cam, and a mounting head for adsorbing an electronic component provided on the peripheral edge of the rotary table according to the intermittent rotation pitch of the index unit. Various operations by rotation of the cam are performed at each stop position of the mounting head in synchronization with intermittent rotation of the rotary table by rotation of the motor, and the head takes out an electronic component at a component removal position, The present invention relates to an electronic component automatic mounting device that mounts a component on a printed circuit board at a component mounting position.

[0002]

2. Description of the Related Art An automatic electronic component mounting apparatus of this type is disclosed in Japanese Patent Laid-Open No.
No. 227595. This publication describes that an index unit rotates a rotary table (rotary table) intermittently, and a timing belt is wound around a driven pulley from a drive pulley fixed to the input shaft of the index unit. By the rotation of the pulley and the rotation of the driven pulley, the cam of the cam shaft fixed to the pulley rotates intermittently the operation of the mounting head such as vertical movement at the suction station or the mounting station of the mounting head, that is, It is described that this is done in synchronization with the rotation of the mounting head.

[0003]

However, in the above-mentioned prior art, since the rotation is transmitted from the input shaft to the cam shaft by the timing belt, the timing of each operation will be changed unless the rotation phase of the cam shaft with respect to the input shaft is adjusted. Since they cannot be adjusted, it is necessary to adjust the phase of the cam shaft with the belt hung. If the component mounting speed is relatively low, that is, if the rotation speed of the input shaft is low, for example,
The lowering speed of the mounting head driven by the rotation of the cam of the cam shaft which rotates at the speed of this input shaft can be moved up and down during this comparatively long cycle time, so it is possible to move up and down at such a high speed. It is only necessary to decide the cam curve at the timing when the intermittent rotation of the unit stops and then starts to descend. In this case, even if the phase slightly shifts, there is a margin in the head trajectory, so the mounted parts and parts supply A part of the mounting head or a component held by the head does not hit the structure of the part. The operation by rotation of the other cams also has a margin, and the work of matching the rotation phase does not require such fine adjustment. However, if the intermittent rotation of the index unit becomes high speed, in terms of the vertical movement of the head, the vertical movement must be performed during a short cycle time, and as described above, intermittent rotation is the same as at low speed. If the head is moved up and down after it has stopped, there is a problem that the head moves up and down too quickly and damages parts, and the descent is started before the rotary table stops. I am doing something like that. If this is done, the head will descend with a trajectory that barely hits the components already mounted on the other boards, and it will not be possible to give a margin to the operation. If the rotation phase with respect to the intermittent rotation is deviated, problems such as interference will occur.

As described above, when components are mounted at high speed, it is necessary to make fine adjustments so that there is no deviation in the rotational phase. To adjust the rotational phase, the belt is hung on the pulleys of the input shaft and the cam shaft. In this state, loosen the pulley on the cam shaft and rotate the cam shaft with respect to the pulley.In this method, the cam shaft may not be attached to the pulley because the belt may be in place. There is a drawback that it is difficult to smoothly rotate a small angle.

In addition, the number of cases in which the phase must be frequently adjusted also increases due to changes over time such as elongation of the belt.
The problem is that phase adjustment cannot be performed easily.

The rotation phase of the cam of the cam shaft with respect to the input shaft of the index unit is constant regardless of whether the cam is rotated at high speed or at low speed, and the related operations are always performed at the same timing. In some cases, you may want to change the operation timing while driving. For example, when the suction nozzle picks up or mounts a component, the vacuum switching valve is driven by the cam fitted to the cam shaft so that the vacuum start timing is determined by the height position of the nozzle. Here, the component mounting speed changes and the cycle time changes,
For example, if the mounting speed becomes fast and the nozzle descends too quickly, it will come into contact with the component even though the degree of vacuum is not yet sufficient, and it will not be possible to adsorb the component, or the mounting speed will become slow and the nozzle will slow down. When it is lowered by, there is a problem that the component is sucked even though it is still above the component, and the surface where the component should not be sucked is sucked (so-called standing state). For this reason, during automatic operation of component mounting, that is, when the motor rotates the index table and the rotary table continues to rotate intermittently, it is desired to change only the vacuuming timing of the vacuum switching valve for each cycle. There is.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make it possible to easily adjust the phase of a cam of a cam shaft which is stretched by a belt with respect to an input shaft of an index unit.

[0008]

For this reason, the present invention is provided with an index unit for intermittently rotating a rotary table attached to an output shaft by rotation of an input shaft driven by a motor, and an index unit provided on the input shaft. A timing belt hung around an input shaft pulley and a cam shaft pulley provided on a cam shaft having a cam, and an electronic component attached to the periphery of the rotary table according to the intermittent rotation pitch of the index unit. The mounting head is mounted on the mounting head, and various operations by the rotation of the cam are performed at each stop position of the mounting head in synchronization with the intermittent rotation of the rotary table by the rotation of the motor. In the electronic component automatic mounting apparatus that takes out a component and mounts the component on the printed circuit board at the component mounting position, the cam By loosening the other pressing one between the input shaft of the timing belt meshing with the pulleys it is provided with a phase adjustment mechanism for adjusting the rotational phase with respect to the input shaft of the cam shaft.

Further, according to the present invention, the phase adjusting mechanism is composed of a pair of idlers for pushing a timing belt between one cam shaft and a cam shaft adjacent to the cam shaft or an input shaft. .

Further, the present invention has an index unit for intermittently rotating the rotary table attached to the output shaft by the rotation of the input shaft driven by the motor, and an input shaft pulley and a cam provided on the input shaft. A timing belt that is wound around a cam shaft pulley provided on the cam shaft, and a mounting head that adsorbs electronic components that are provided on the peripheral edge of the rotary table according to the intermittent rotation pitch of the index unit. , Various operations by the rotation of the cam are performed at each stop position of the mounting head in synchronization with the intermittent rotation of the rotary table by the rotation of the motor, and the head picks up the electronic component at the component pick-up position and the component mounting position. In an automatic electronic component mounting device that mounts the component on a printed circuit board with a A phase adjusting mechanism that adjusts the rotational phase of the cam shaft with respect to the input shaft by pushing one of the minging belts and loosening the other, a drive source that drives the phase adjusting mechanism, and the phase adjusting mechanism according to the rotational speed of the input shaft. A control means for controlling the drive source is provided so as to change the adjustment amount of the phase adjustment mechanism.

[0011]

According to the structure of the first aspect, the rotational phase of the cam shaft with respect to the input shaft is adjusted by using the phase adjusting mechanism that pushes one of the timing belt and the input shaft of the timing belt meshing with the cam shaft pulley and loosens the other. .

According to the structure of claim 2, by adjusting the pressing force of the pair of idlers for pressing the timing belt between one cam shaft to be adjusted and the adjacent cam shaft or input shaft, the target is adjusted. Only one of the cam shafts is adjusted in phase with respect to the input shaft.

According to the structure of claim 3, the control means controls the drive source for driving the phase adjusting mechanism so as to change the adjustment amount according to the rotational speed of the input shaft.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, 1 is a Y table which moves in the Y direction by the rotation of the Y-axis motor 2, and 3 is an X table.
This is an XY table that moves in the X and Y directions by moving in the X direction on the Y table 1 by the rotation of the shaft motor 4, and a chip-shaped electronic component 5 (hereinafter referred to as a chip component or component) is mounted. The printed circuit board 6 is fixedly mounted on a fixing means (not shown).

Reference numeral 7 denotes a supply table, on which a large number of component supply devices 8 for supplying the chip components 5 are arranged. Reference numeral 9 denotes a supply base drive motor, which rotates the ball screw shaft 10 to screw the ball screw shaft 10 into a nut 11 which is fixed to the supply base 7.
It is guided by and moves in the X direction. Reference numeral 13 denotes a rotary table that rotates intermittently, and mounting heads 15 having a plurality of suction nozzles 14 are arranged at equal intervals on the outer edge of the table 13 in accordance with the intermittent pitch.

Reference numeral I denotes a suction station as a component taking-out position, which is a stop position of the mounting head 15 at which the suction nozzle 14 picks up and picks up the component 5 from the supply device 8 by intermittent rotation of the rotary table 13.
At, the suction nozzle 14 sucks the component 5.

Reference numeral 16 denotes a component recognition device for recognizing the positional deviation of the component 5 sucked by the suction nozzle 14 by recognizing the lower surface of the component 5 with a camera in a predetermined visual field range and recognizing the imaged screen. -Provided in Option II.

Next mounting head 1 of recognition station II
The position where 5 is stopped is the angle correction station III, and the head rotation device 17 is an angle amount that takes into account a predetermined angle amount for correcting the angular position deviation of the chip component 5 due to the recognition result of the recognition device 16. Wearing head 15
Rotate in the θ direction. The θ direction is the direction of rotation around the axis of the nozzle 14 extending in the vertical direction.

The stop position next to the angle correction station III is the mounting station IV as the component mounting position.
The component 5 to be sucked by the suction nozzle 14 of the station IV is mounted on the substrate 6 by lowering the mounting head 15.

Reference numeral 20 denotes an up-and-down moving bar, which engages with a swing lever 21 of the component supply device 8 to swing the component storage tape (not shown) in which the chip components 5 are enclosed at predetermined intervals according to the spacing. The chip component 5 is supplied to the component suction position of the suction nozzle 14 by intermittent feeding. 22 is a tape reel around which the component storage tape (not shown) is wound.

The rotary table 13 has a base plate 35.
Output shaft 2 of the index unit 24 mounted and fixed on the
The index motor 26 is intermittently rotated by being transmitted to the input shaft 28 of the unit 24 through the speed reducer 27 and being rotated.

An index unit 24 is provided at one end of the input shaft.
Further, the timing pulley 29 as an input shaft pulley is fitted to the one end portion.

Reference numeral 30 denotes a cam shaft provided with a plurality of cylindrical cams 31, and a timing pulley 32 as a cam shaft pulley is also fitted to one end of the cam shaft 30, and the pulley 29 is provided.
A timing belt 33 is stretched around the pulleys 32, and the rotation of the input shaft 28 is transmitted to each cam shaft 30.

The cam 31 of each cam shaft 30 rotates in synchronization with the intermittent rotation of the rotary table 13, and all the various operations driven by the cam 31 operate in synchronization with the rotary table 13. . For example, the lifting and lowering of the mounting head in the suction station I and the mounting station IV is determined by the rotation angle of the input shaft 28, and the vertical movement is synchronized with the rotary table 13.

The timing belt 33 is pressed between the input shaft 28 and the adjacent cam shaft 30 by a pair of idlers 38 rotatably mounted on a mounting plate 37 and stretched with a predetermined tension. Have been passed over. The idler 38 is fixed by fixing the mounting plate 37 to the index unit 24 by inserting a bolt 40 into a long hole 39 formed in the mounting plate 37. The one end of the mounting plate 37 is engaged with the end of the adjusting bolt 42 screwed to the bolt mounting piece 41 rising from the index unit 24, and the idler 38 resists the tension of the belt 33 and moves upward in FIG. The belt 33 can be adjusted by pressing it to move it, or by loosening it to move it downward. The pair of idlers 38 constitutes a phase adjusting mechanism,
For example, by moving the right idler 38 upward and moving the left idler 38 downward and fixing the same, the position of the belt 33 is changed without changing the tension of the belt 33, and each cam is changed. The shaft 30 rotates clockwise by the same rotation angle (the input shaft 28 does not rotate), and the rotation phase can be changed with respect to the input shaft 28.

As shown in FIG. 4, the timing pulley 32 is fastened to each cam shaft 30 by a friction fastening member 43. The friction fastening member 43 is fitted between the pulley 32 and the cam shaft 30, and an inner ring 44, An outer ring 45 and a plurality of lock bolts 46 are formed. The inner ring 44 and the outer ring 45 are in contact with each other with a taper. When the lock bolt 46 is tightened, the outer ring 45 is pulled downward in FIG. 4, and the inner ring 44 is pulled by the wedge principle. Contracts and is pressed against the cam shaft 30, the outer ring 45 expands and presses against the pulley 32, and a strong frictional force is generated by this pressing force, so that the cam shaft 30 and the pulley 32 are fastened.

The operation will be described below with the above configuration.

First, the rotational phase of each cam shaft 30 is determined by the input shaft 2
The adjustment work for adjusting to 8 will be described.

With the timing belt 33 being stretched over the timing pulley 29 of the input shaft 28 and the timing pulley 32 of each cam shaft 30, the lock bolt 46 of each cam shaft 30 is loosened, and the cam shaft 30 is pulley 32. The cam 31 of the cam shaft 30 is set to rotate freely with respect to
After aligning so that the origin of the same may coincide with the origin of the input shaft 28, the lock bolt 46 is tightened to fix the cam shaft 30 to the pulley 32. This operation is performed for each cam shaft 30. It is assumed that the origin position of each cam 31 with respect to each cam shaft 30 is accurately adjusted before that. Further, each idler 38 is assumed to be fixed, for example, so that the timing belt 33 is at the position shown by the solid line in FIG.

Next, the actual deviation of the rotational phase of each cam shaft 30 is measured (at this time, the phase of each cam shaft 30 is adjusted almost exactly), and the cam which must be adjusted most accurately. The bolt 37 is loosened so that the shaft 30 (for example, the cam shaft 30 having the cam 31 that moves up and down the head 15) is accurately fitted, and then one of the pair of idlers 38 is lowered by adjusting the adjusting bolt 42 (pushing down). ), And adjusts the adjustment bolt 42 so that the belt 33 is stretched with the same tension and raises (pushes up) the other. When there is the position of each idler, the mounting plate 37 is tightened and fixed with the bolt 37. Since the elongated hole 39 moves along the bolt 37, the mounting plate 37 is guided and moves. The guide may be moved by the mounting plate being guided by the guide plate. In this way, the phase of the cam 31 that has to be most accurately matched is made to match the input shaft 28, and since it is originally substantially accurately matched, the other cam shafts 3
Phase matching is performed with a precision of 0 even if there is no problem. This adjustment can be performed even when the phase changes due to aging.

Next, the automatic operation for mounting components will be described.

First, the rotation of the motor 26 causes the index unit 24 to intermittently rotate the mounting head 15,
Stop the suction station I, and set the timing belt 33.
The cam 31 is rotated by the rotation of the cam shaft 30 via, and the operation of lowering the mounting head 15 of the suction station I is performed in synchronization. Since the input shaft is rotating at high speed,
The mounting head 15 starts to descend before the rotary table 13 stops, and the mounting head 15 starts to descend before the supply base 7 stops, but the structure around the component take-out position of the component supply device 8 The electronic component 5 is approached so that the suction nozzle 14 barely touches it, vacuum suction is started, and the component 5 is sucked by the nozzle 14. Subsequently, the mounting head 15 takes out the component 5 and ascends, and the supply base 7 starts moving at a predetermined ascending position and also ascends without hitting the structure.

Next, the mounting head 15 stops at the next station, and the suction station I receives the next mounting head 1.
When 5 arrives, the component 5 is similarly taken out.

Next, the component 5 held by the mounting head 15
In the recognition station II after that, the component recognition device 1
The positional deviation is recognized by 6, and then the angular position and XY
The position in the direction is corrected, and the mounting station IV mounts the printed circuit board at a predetermined position. Even in the mounting station IV, since the component 5 is mounted at high speed, XY
When the table 3 is moving, the head 15 starts to descend, and nevertheless the component 5 which is attracted because the phase of the cam 31 is accurately aligned with the input shaft 28.
Is mounted at a predetermined position without hitting the parts attached in advance.

Next, a second embodiment will be described with reference to FIG. The same structure as that of the first embodiment is designated by the same reference numeral.

Reference numeral 50 denotes a cam shaft having a cylindrical cam 51. A timing belt 33, which serves as a cam shaft pulley attached to the cam shaft 50, has a timing belt 33 stretched over a pulley 29 of an input shaft 28. There is. A lever 53 is engaged with the cam 51, and one end of the lever 53 is engageable with a switching valve 54 for cutting off vacuum suction of the suction nozzle 14 in the mounting station IV. By swinging the lever 53 in the counterclockwise direction in FIG. 5, the switching valve 54 is switched again, and the suction nozzle 14 cuts off vacuum suction and is opened to atmospheric pressure. The suction nozzle 14 is connected to a vacuum pump (not shown) via a switching valve 54 provided for each mounting head 15, and when the mounting head 15 reaches the suction station I, the switching valve 54 is switched by a driving means (not shown). The suction nozzle 14 is switched from the atmospheric pressure state to a state in which it is evacuated by a vacuum pump, and the mounting station IV disconnects the vacuum.

Between the adjacent input shaft 28 and the pulley 32 on both sides of the pulley 52 of the timing belt 33, idlers 55 and 56 are engaged to give tension.

The idlers 55 and 56 are ball screws 59 and 60 driven by motors 57 and 58 as drive sources, respectively.
Is engaged with nuts 65 and 66 attached to slide plates 63 and 64 of linear guides 61 and 62 to which the idlers 55 and 56 are rotatably attached, so that the idlers 55 and 56 can move up and down.

Next, the control block of the electronic component automatic mounting apparatus of the second embodiment will be described with reference to FIG.

68 is a CPU as a control means, and R
Based on the data stored in the AM 69, the operation related to the component mounting of the electronic component automatic mounting apparatus is comprehensively controlled according to the program stored in the ROM 70. Control objects such as the motor 57 and the motor 58 are connected to the CPU 68 via an interface 71 and a drive circuit 72.

The RAM 69 has a cycle time (input shaft 2
8 is one rotation time, during which the cam shafts 30, 5
0 also makes one rotation, the rotary table 13 makes one intermittent rotation, and the operation in each station is performed once. ), The amount of movement to move the idlers 55 and 56 is stored.

With the above construction, the operation of the second embodiment is carried out as follows.

The overall operation is performed in the same manner as in the first embodiment, but the CPU 68 reads the movement amount of the idlers 55 and 56 at the next cycle time from the RAM 69 and starts the cycle time of the rotation of the input shaft 28. Cycle time at a position near the origin (at this position, the mounting head 15 is in a raised position and is in a vacuum suction state, and the lever 53 is not engaged with the valve 54 as shown in FIG. 5). The motors 57 and 58 rotate to move the movement amount in a predetermined time zone when the process ends or starts. As for the movement of the idlers 55 and 56, when one moves in the direction of pushing the belt 33, the other moves in the direction of loosening the belt 33 so that the tension of the belt 33 is kept constant and the camshaft 50 moves. When the belt 33 moves around and the timing pulley 52 meshes with the belt 33,
Rotate with respect to.

The phase of the cam 31 provided on the cam shaft 50 changes depending on the rotation direction with respect to the input shaft 25, and the cam 31 of the cam shaft 50 rotates as the input shaft 28 rotates. Even if the switching timing changes and the descending speed of the nozzle 14 changes due to the change of the cycle time, the vacuum suction force is always open to the atmosphere at a predetermined height so that the component 5 can be properly mounted. At this time, the rotational phase of the cam shaft 50 changes with respect to the input shaft 25, but the rotational phase of the other cam shafts 30 does not change with respect to the input shaft 28, and the operation of each cam shaft 30 is always at the same timing. Done.

Further, in the second embodiment, the suction nozzle 14
Although the phase of the cam shaft 50 is changed in order to change the timing of switching the vacuum in the automatic operation, by changing the phase of the vertical movement cam of the suction nozzle 14 with the same configuration, the transition can be made. It is also possible to change the timing by changing the phase in the same cycle, for example, to adjust the timing and speed when the nozzle descends and rises in accordance with the low speed of the supply table. Further, depending on the length of the nozzle 14 and the thickness of the component 5, the suction station I and the mounting station I may be arranged so as not to interfere with surrounding structures.
It is possible to change the vertical movement timing with V as in the second embodiment.

Further, as in the second embodiment, the timing belt between the adjacent cam shafts or the input shafts on both sides of the cam shaft is pushed by the idler, and the pressing amount is changed, whereby the input of the other cam shaft is changed. Since the phase of the cam shaft can be changed without changing the phase with respect to the shaft, in the first embodiment as well, when it is desired to adjust the phase of only one cam shaft, the cam shafts adjacent to each other on both sides of the cam shaft or It suffices to push the timing belt between the input shaft and the idler. If you want to adjust the phase of each cam shaft independently, you can arrange this phase adjustment mechanism for each cam shaft. . That is, if an idler for pressing the belt is provided between each cam shaft (or between the cam shaft and the input shaft) so that the pressing amount can be changed, the phase of each cam shaft with respect to the input shaft can be arbitrarily changed. It becomes possible to adjust. However, since the length of the entire belt cannot be changed, it is necessary to adjust the pressing amount as a whole without changing the tension.

[0048]

As described above, according to the present invention, the phase of the cam shaft with respect to the input shaft is adjusted by changing the pressing amount of the timing belt, so that the fine adjustment of the phase becomes easy.

Further, the pressing amount of the idler is adjusted between the adjacent cam shafts or the input shafts on both sides of the cam shaft to be phase adjusted. It is possible to adjust only the phase of the target cam shaft with respect to the input shaft and not to change the phases of the other cam shafts with respect to the input shaft.

Further, since the phase adjusting mechanism is driven by using the driving source and the amount of the driving can be changed according to the rotation speed of the input shaft, the timing of cutting off the vacuum suction can be changed according to the cycle time. It is possible to appropriately change the timing by the cam during operation.

[Brief description of drawings]

FIG. 1 is a side view of an electronic component automatic mounting device.

FIG. 2 is a plan view of an electronic component automatic mounting device.

FIG. 3 is a plan view of an index unit portion of the electronic component automatic mounting device.

FIG. 4 is a partially cutaway side view showing a mechanism for fastening a timing pulley to a cam shaft.

FIG. 5 is a side view of an electronic component automatic mounting apparatus according to a second embodiment.

FIG. 6 is a control block diagram of an electronic component automatic mounting apparatus according to a second embodiment.

[Explanation of symbols]

 5 Chip Electronic Components 6 Printed Circuit Board 13 Rotary Table 15 Mounting Head 24 Index Unit 25 Output Shaft 26 Index Motor 28 Input Shaft 29 Timing Pulley (Input Shaft Pulley) 30 Cam Shaft 31 Cylindrical Cam 32 Timing Pulley (Cam Shaft Pulley) 33 Timing Belt 37 Mounting plate (Phase adjusting mechanism) 38 Idler (Phase adjusting mechanism) 39 Slotted hole (Phase adjusting mechanism) 40 Bolt (Phase adjusting mechanism) 41 Bolt mounting piece (Phase adjusting mechanism) 42 Adjustment bolt (Phase adjusting mechanism) 50 Cam Shaft 51 Cylindrical cam 52 Timing pulley (Cam shaft pulley) 55 Idler (Phase adjustment mechanism) 56 Idler (Phase adjustment mechanism) 57 Motor (Drive source) 58 Motor (Drive source) 59 Ball screw (Phase adjustment mechanism) 60 Ball screw (Phase adjustment) Mechanism) 6 Linear guide (phase adjustment mechanism) 62 Linear guide (phase adjustment mechanism) 63 Slide plate (phase adjustment mechanism) 64 Slide plate (phase adjustment mechanism) 65 Nut (phase adjustment mechanism) 66 Nut (phase adjustment mechanism) 68 CPU (control means) )

Claims (3)

[Claims] 1. An index unit for intermittently rotating a rotary table attached to an output shaft by rotation of an input shaft driven by a motor, and a cam shaft having an input shaft pulley and a cam provided on the input shaft. The motor having a timing belt wound around a provided cam shaft pulley, and a mounting head for adsorbing an electronic component provided at the periphery of the rotary table in accordance with the intermittent rotation pitch of the index unit, The rotation of the rotary table synchronizes with the intermittent rotation of the rotary table to perform various operations by the rotation of the cam at each stop position of the mounting head. In an electronic component automatic mounting device for mounting a printed circuit board on a printed circuit board, a timing belt meshing with the camshaft pulley. The electronic component automatic mounting apparatus is provided with a phase adjusting mechanism for adjusting the rotational phase of the cam shaft with respect to the input shaft by pressing one of the input shaft and the input shaft and loosening the other. 2. The phase adjusting mechanism comprises a pair of idlers for pushing a timing belt between one cam shaft and each of a cam shaft adjacent to the cam shaft or an input shaft. Item 1. The electronic component automatic mounting apparatus according to Item 1. 3. An index unit for intermittently rotating a rotary table attached to an output shaft by rotation of an input shaft driven by a motor, and a camshaft having an input shaft pulley and a cam provided on the input shaft. The motor having a timing belt wound around a provided cam shaft pulley, and a mounting head for adsorbing an electronic component provided at the periphery of the rotary table in accordance with the intermittent rotation pitch of the index unit, The rotation of the rotary table synchronizes with the intermittent rotation of the rotary table to perform various operations by the rotation of the cam at each stop position of the mounting head. In an electronic component automatic mounting device for mounting a printed circuit board on a printed circuit board, a timing belt meshing with the camshaft pulley. A phase adjustment mechanism that adjusts the rotational phase of the cam shaft with respect to the input shaft by pressing one of the two and loosening the other; and a drive source that drives the phase adjustment mechanism,
An electronic component automatic mounting apparatus comprising: a control unit that controls the drive source so as to change the adjustment amount of the phase adjustment mechanism according to the rotation speed of the input shaft.