JP5858548B2 - Component mounter - Google Patents

Description

  According to the present invention, a movable nozzle station for storing at least one replacement suction nozzle unit for replacing the suction nozzle unit held in the mounting head is reciprocated between a nozzle replacement position and a retracted position by an air cylinder. The invention relates to a component mounter configured as described above.

  When the speed of a driving device using an air cylinder as a driving source is increased, the impact that collides with the stroke end of the piston rod increases, which causes a problem of increasing noise and vibration. As a countermeasure against this, as shown in Patent Document 1 (Japanese Patent Application Laid-Open No. 8-93718), the chambers on both sides of the piston in the air cylinder are decelerated so that the piston rod is decelerated near the stroke end of the piston rod during driving of the air cylinder. Some have an air flow rate control mechanism for controlling the air flow rate.

JP-A-8-93718

  However, if the air flow control mechanism is provided in the air cylinder as in the above-mentioned Patent Document 1, not only the configuration of the air cylinder becomes complicated and the cost increases, but also the size of the air cylinder increases, and there is a demand for space saving. I can't meet.

  Therefore, the problem to be solved by the present invention is to reduce the impact at the stroke end by decelerating the piston rod near the stroke end while increasing the moving speed of the piston rod of the air cylinder with a simple and compact configuration. To provide a component mounting machine capable of driving a movable nozzle station using a driving device.

In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a movable nozzle station for storing at least one replacement suction nozzle unit for replacing the suction nozzle unit held in the mounting head, and a piston of an air cylinder. The reciprocating movement of the rod causes the movable nozzle station to move between the movement range of the suction nozzle unit in the XY direction, the nozzle replacement position that overlaps in the Z direction, and the retreat position that does not overlap in the Z direction. A reciprocating drive device , wherein the drive device retreats the movable nozzle station to the retreat position during component suction / mounting operation, and moves the movable nozzle station to the nozzle replacement position during automatic replacement of the suction nozzle unit. a the mounter to move on, the drive device, the Eashiri An elastic member that applies an elastic force in the protruding direction to the piston rod within a predetermined range of the piston rod in the retracting direction of the stroke range of the piston rod of the piston. The present invention is characterized in that an impact when colliding with a certain stroke forward end is relieved by air pressure in the air cylinder.

  In this configuration, when the piston rod of the air cylinder is driven in a direction in which the piston rod protrudes from the backward stroke end, the elastic force in the protruding direction is applied to the piston rod by the elastic member within a predetermined range from the start of the stroke range of the piston rod. Since it acts, the protrusion speed of the piston rod is increased by the assistance of the elastic member as compared with the conventional configuration without the elastic member. As a result, when the piston is accelerated in the air cylinder, the air pressure on the rear side of the piston in the air cylinder temporarily decreases, and the elastic force of the elastic member stops acting on the piston rod. The air pressure balance on both sides of the piston reverses and the air pressure acts on the piston in the deceleration direction, so that the protruding speed of the piston rod is decelerated and the impact at the stroke forward end is alleviated.

  On the other hand, when driving the piston rod in the direction in which it is retracted from the stroke forward end, it is driven without the elastic force of the elastic member acting on the piston rod until reaching the elastic force acting range of the elastic member from the start of driving, When the piston rod reaches the elastic force acting range of the elastic member, the retracting speed of the piston rod is decelerated by the elastic force of the elastic member, and the impact at the reverse stroke end is alleviated.

  As described above, the present invention has a simple and compact structure in which only an elastic member is provided, and increases the moving speed of the piston rod of the air cylinder, while near the stroke ends on both the front and rear sides (projection direction side and retraction direction side). The piston rod can be decelerated to reduce the impact at the stroke ends on both the front and rear sides.

  In this case, a configuration in which an elastic member is provided in the air cylinder is also conceivable. However, as in claim 2, a spring is used as the elastic member, and the spring is inserted into the piston rod from the outside of the air cylinder. It ’s fine. In this way, it becomes possible to attach the spring to the air cylinder by retrofitting to the air cylinder having the conventional structure, and the present invention can be implemented with low cost modification.

  By the way, when the spring is repeatedly extended to the free length (the length that the spring is fully extended in the no-load state) or compressed to the close contact state between the wires (the spring coils are in close contact), The mechanical characteristics of the spring are likely to deteriorate.

  As a countermeasure against this, within the range in which the spring applies a spring force to the piston rod as in claim 3, the length of the spring becomes shorter than the free length even at the end of the spring in the extending direction side. It is preferable that the amount of contraction of the spring is smaller than the maximum amount of contraction of the spring alone (the amount of contraction until the line-to-line contact state is reached) even at the end of the contraction direction side. In this configuration, the spring can be prevented from extending to the free length or compressed to the line-to-line contact state, the life of the spring can be extended, and stable impact relaxation performance can be maintained over a long period of time.

FIG. 1 is a side view showing a state in which a piston rod of a driving device according to an embodiment of the present invention protrudes. FIG. 2 is a side view showing a state in which the piston rod of the driving device is retracted. FIG. 3 is a front view showing a stopper structure for restricting the extension of the spring of the driving device.

Hereinafter, an embodiment embodying a mode for carrying out the present invention will be described.
First, the configuration of the drive device 10 will be described with reference to FIG.
An air cylinder 12 is mounted on a support base 11 of the component mounting machine, and a movable nozzle station 15 is connected to a tip of a piston rod 13 of the air cylinder 12 via a connector 14. Movable nozzle station 15, for example, is configured described in the specification of Japanese Patent Application No. 2009-261445, the movable nozzle station 15, the movement range of the XY direction of the suction nozzle unit during component pickup and mounting operation of the component mounter It arrange | positions in the position which overlaps with a Z direction, and is comprised so that at least 1 suction nozzle unit for replacement | exchange can be stored. During component pickup and mounting operations, retract the piston rod 13 of the air cylinder 12 to the stroke backward end, the movement range and Z of the nozzle changing a position overlapping the movable nozzle station 15 in the moving range and the Z-direction in the XY direction of the suction nozzle unit When the suction nozzle unit is automatically replaced, the piston rod 13 of the air cylinder 12 protrudes to the stroke forward end and the movable nozzle station 15 is moved to the nozzle replacement position.

  When the speed of the driving device 10 using the air cylinder 12 as described above is increased, the impact that collides with the stroke end of the piston rod 13 increases, and there is a problem that noise and vibration increase.

  Therefore, in this embodiment, as means for reducing the impact that collides with the stroke end of the piston rod 13 of the air cylinder 12, the piston rod is within a predetermined range of the piston rod 13 in the retracting direction of the stroke range of the piston rod 13. A spring 16 (elastic member) that applies an elastic force in the protruding direction to 13 is inserted into the piston rod 13.

  In this case, the number of times the spring 16 is extended to a free length (the length in which the spring 16 is fully extended in a no-load state) or compressed to a close contact state (a state in which the coils of the spring 16 are in close contact). Is repeated, the mechanical characteristics of the spring 16 are likely to deteriorate.

  Therefore, in this embodiment, within the range in which the spring 16 applies a spring force to the piston rod 13, the length of the spring 16 is shorter than the free length even at the end of the spring 16 in the extending direction side. The amount of contraction of the spring 16 is also configured to be smaller than the maximum amount of contraction of the spring 16 alone (the amount of contraction until the line-to-line contact state is reached). Accordingly, the spring 16 is configured to expand and contract within a range of, for example, 20% to 80% with respect to the maximum contraction amount of the spring 16 alone.

  Specifically, a concave stopper 17 (see FIG. 3) that restricts the position of the end of the spring 16 in the extending direction is provided on the support base 11, and the concave stopper 17 is provided at the tip of the spring 16. An ellipse-shaped locking plate 18 to be locked is attached, and the piston rod 13 is movably inserted into an insertion hole formed in the center of the locking plate 18.

  As shown in FIG. 1, in a state where the piston rod 13 is positioned at the end on the protruding direction side (stroke advance end), both end portions of the locking plate 18 at the tip of the spring 16 abut both side portions of the concave stopper 17. (See FIG. 3), the spring 16 is in a state where its extension is stopped at a length shorter than the free length. On the other hand, as shown in FIG. 2, in the state where the piston rod 13 is positioned at the end (reverse stroke end) on the retracting direction side, the coupling tool 14 at the tip of the piston rod 13 pushes the locking plate 18 and the spring 16 alone. For example, it is compressed to about 80% of the maximum shrinkage amount.

  In the drive device 10 configured as described above, when the piston rod 13 of the air cylinder 12 is driven in a direction in which the piston rod 13 protrudes from the backward stroke end, the drive plate 10 is from the start of driving until the locking plate 18 at the tip of the spring 16 contacts the stopper 17. In this range, since the spring force in the protruding direction acts on the piston rod 13 by the spring 16, the protruding speed of the piston rod 13 is increased by the assistance of the spring 16 as compared with the conventional configuration without the spring 16. As a result, the piston is accelerated in the air cylinder 12 to temporarily reduce the air pressure on the rear side of the piston in the air cylinder 12, so that the locking plate 18 at the tip of the spring 16 comes into contact with the stopper 17 and the spring 16 Is stopped and the spring force of the spring 16 stops acting on the piston rod 13, the pressure balance on both sides of the piston in the air cylinder 12 is reversed, and the air pressure acts on the piston in the deceleration direction. The projecting speed of the piston rod 13 is reduced, and the impact at the stroke forward end is alleviated.

  On the other hand, when the piston rod 13 is driven in a direction in which it is retracted from the stroke forward end, the piston rod 13 is in the range from the start of driving until the connecting tool 14 at the tip of the piston rod 13 contacts the locking plate 18 at the tip of the spring 16. The spring 16 is driven without the spring force acting on it, and when the coupling member 14 at the tip of the piston rod 13 comes into contact with the locking plate 18 at the tip of the spring 16, the retraction speed of the piston rod 13 is increased by the spring force of the spring 16. Decelerated and the impact at the reverse end of the stroke is alleviated.

  According to the present embodiment described above, with a simple and compact configuration in which the spring 16 is inserted into the piston rod 13 from the outside of the air cylinder 12, the moving speed of the piston rod 13 of the air cylinder 12 is increased. The piston rod 13 can be decelerated in the vicinity of the stroke ends on both the front and rear sides (projection direction side and retraction direction side), and the impact at the stroke ends on both the front and rear sides can be reduced. Moreover, the impact mitigation function at the stroke end can be retrofitted with a low-cost modification even for a conventional air cylinder.

In addition, in this embodiment, in the range in which the spring 16 applies the spring force to the piston rod 13, the length of the spring 16 is shorter than the free length even at the end of the spring 16 in the extending direction side. Since the amount of contraction of the spring 16 is smaller than the maximum amount of contraction of the spring 16 alone even at the position of the end in the direction of contraction of the spring 16, the spring 16 extends to a free length or is in a line-to-line contact state. Can be prevented, the life of the spring 16 can be extended, and stable impact relaxation performance can be maintained over a long period of time.
However, the present invention may be configured such that the stopper 17 is omitted and the spring 16 is extended to the free length, and even in this case, the intended purpose of the present invention can be sufficiently achieved.

  Further, the present invention is not limited to the configuration in which the elastic force in the protruding direction is applied to the piston rod 13 by the spring 16, and the elastic force in the protruding direction may be applied to the piston rod 13 by another elastic member such as rubber. good. Further, the mounting structure of the spring 16 (elastic member) and the configuration that limits the amount of expansion and contraction may be changed as appropriate.

  DESCRIPTION OF SYMBOLS 10 ... Drive apparatus, 11 ... Support stand, 12 ... Air cylinder, 13 ... Piston rod, 14 ... Connection tool, 15 ... Movable nozzle station, 16 ... Spring (elastic member), 17 ... Stopper, 18 ... Locking plate

Claims (3)

A movable nozzle station for storing at least one replacement suction nozzle unit for replacing the suction nozzle unit held by the mounting head, and the movable nozzle station during component suction / mounting operation by reciprocation of the piston rod of the air cylinder wherein a driving device for reciprocating between a retracted position not overlapping the nozzle replacement position and the movement range and the Z-direction to overlap the moving range and the Z-direction in the XY direction of the suction nozzle unit of the drive apparatus, part A component mounting machine that retracts the movable nozzle station to the retracted position during suction / mounting operation, and moves the movable nozzle station to the nozzle replacement position during automatic replacement of the suction nozzle unit ,
The drive device includes an elastic member that applies an elastic force in a protruding direction to the piston rod within a predetermined range on a retracting direction side of the piston rod in a stroke range of the piston rod of the air cylinder. A component mounting machine characterized in that an impact when colliding with a stroke forward end, which is an end in the protruding direction, is reduced by air pressure in the air cylinder.   The component mounting machine according to claim 1, wherein the elastic member is a spring and is inserted into the piston rod from the outside of the air cylinder.   In the range in which the spring applies a spring force to the piston rod, the length of the spring is shorter than the free length even at the end of the spring in the extending direction, and the position of the end of the spring in the contracting direction is also the position. The component mounting machine according to claim 2, wherein the amount of contraction of the spring is configured to be smaller than the maximum amount of contraction of the spring alone.

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