JP2008258551A - Electronic component feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low profile electronic component feeder of high precision, with no backlash, with high flexibility in design, of which components can be held and aligned in a carrier tape. <P>SOLUTION: An electronic component feeder 20 supplies an electronic component stored in a carrier tape. It comprises an index wheel 44 which transports an electronic component as far as a component pickup position, an electric motor 42 which is a single drive source for driving the index wheel 44, and a crank mechanism which is arranged between the index wheel 44 and an electric motor 42, for transmitting the rotational drive force from the electric motor 42 to the spindle of the index wheel 44. When the electric motor 42 rotates by a specified angle, the index wheel 44 rotates by the same amount of angle through a main crank 48, a connection member 52, and a sub crank 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic component supply device, and more particularly, to an electronic component supply device (tape feeder) that supplies an electronic component stored in a carrier tape to an electronic component automatic mounting device (mounter).

Conventionally, as shown in Patent Document 1, an electronic component automatic mounting device (mounter) has been used to mount an electronic component on a printed wiring board at high speed and with high accuracy. With the increase in the speed of the mounter, the supply speed of electronic components by the electronic component supply device has also been increased. The electronic component supply device sends the taped electronic component to a position where the electronic component automatic mounting device picks up the electronic component while peeling the cover tape, and is called a tape feeder. Tape feeders (electronic component supply devices) can be broadly divided into two types: mechanical types that use air cylinders or the like as drive sources, and motor types that use electric motors such as servo motors or stepping motors. . Recently, the use of a motor type has been increasing so as to cope with high speed and high accuracy.
JP 2004-111726 A

  In a high-speed tape feeder that supplies electronic components to a high-speed mounter at high speed, it is necessary to accurately transmit the movement of the drive source to the index wheel. Ideally, if the index wheel itself is a motor, it will be a direct drive and high accuracy. However, there is only a limited space around the index wheel, and the motor is actually arranged at a position away from the index wheel. In that case, a plurality of intermediate gears are provided between the rotation shaft of the motor and the rotation shaft of the index wheel, and the size and the number of intermediate gears are determined by calculating the gear size, gear ratio, and the like. If the number of intermediate gears increases, backlash occurs between the gears, and the driving force from the driving source cannot be transmitted to the index wheel with high accuracy. There is also the problem of increased costs. Further, the inertial force increases due to the weight of the intermediate gear, which is not preferable.

  Further, an 8 mm tape feeder having a carrier tape width of 8 mm is usually designed to fit within a width of 12 mm to 20 mm, and it is necessary to use a thin motor or a small diameter motor. When a small-diameter motor is used, since the rotation direction of the motor and the rotation direction of the index wheel intersect 90 degrees, it is necessary to convert the angle with a bevel gear or the like, and the number of intermediate gears increases. When a thin motor is used and an encoder or the like is arranged coaxially with the rotation shaft of the motor, there is a problem that the width on the rotation shaft of the motor becomes large and it is difficult to fit in a narrow feeder.

  In addition, an inertial force is applied to the electronic component after being transported at a high speed, and the electronic component may jump out of the pocket of the carrier tape due to the residual inertial force. For this reason, some high-speed tape feeders are provided with a shutter mechanism at the component pickup position so that electronic components do not jump out due to inertial force, and the shutter is covered with this shutter so that the shutter is opened only during component pickup. is there. Even if a shutter mechanism is provided, the inertial force of the index wheel remains when the shutter is opened, and this residual inertial force may cause electronic components to pop out, which is a problem. Furthermore, there is a problem that the electronic component cannot be accurately positioned at the component pick-up position because the electronic component is disturbed by the residual inertia force in the pocket of the carrier tape.

  In addition, when an electric motor is used as a drive source and a shutter is provided, it is necessary to open the shutter after the index wheel is stopped, and a drive source for opening and closing the shutter is required separately from the index wheel drive source. Therefore, there is a problem that the cost of the feeder increases.

  Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, eliminates backlash, has a degree of design freedom, and can hold and position parts in a carrier tape, is thin and high in height. An object is to provide an accurate electronic component supply device.

  In order to achieve the above object, the present invention provides an electronic component supply apparatus for supplying an electronic component stored in a carrier tape, and includes an index wheel means for conveying the electronic component stored in the carrier tape to a component pickup position. And an electric motor that is a single drive source for driving the index wheel means, and the rotary driving force from the electric motor is applied to the rotation shaft of the index wheel means. A crank mechanism that transmits the main crank, one end of which is rotatably connected to the rotating shaft of the electric motor, and one end of the crank mechanism that is rotatably connected to the rotating shaft of the index wheel means. Is connected to the other end of each of the main crank and the sub-crank so as to be rotatable. A coupling and the member, and the electric motor is rotated a predetermined angle, the main crank, the coupling member, the sub-crank, and is characterized in that the indexing wheel means is configured to rotate by the same angle. In the present invention configured as described above, the index wheel means is directly rotated by the index wheel means without backlash by rotating the index wheel means directly from the electric motor as a single drive source via the crank mechanism. Can communicate.

  In the present invention, preferably, the crank mechanism is a planet crank mechanism, and the connecting member of the planet crank mechanism is a polygonal member, and each crank of one or a plurality of rotating members other than the electric motor and the index wheel means is used. Further, the crank of each of the one or more rotating members has the same length as the main crank and the sub crank, and when the electric motor rotates by a predetermined angle, the main crank and the connecting member The sub-crank, the index wheel means, and the one or more rotating members are configured to rotate by the same angle. In the present invention configured as described above, the index wheel means is rotated without backlash by rotating the index wheel means directly from the electric motor as a single drive source via the planet crank mechanism. Can be communicated to.

  In the present invention, preferably, at least one of the rotating members including the index wheel is position detecting means (for example, an encoder or a sensor) for detecting the rotational position of the electric motor. In the present invention configured as described above, the electric motor is kept thin without attaching an encoder for confirming the rotational position of the electric motor or the like coaxially with the rotating shaft of the electric motor as a single drive source. It can be rotated without backlash.

  In the present invention, the main crank is preferably connected to the rotating shaft of the electric motor via one or more gears. In the present invention configured as described above, an electric motor, which is a single drive source located away from the index wheel means, can be arranged without worrying about the number and size of the intermediate gears, and the degree of freedom in design can be increased. Can be increased.

  The present invention preferably further includes magnet means provided in the vicinity of the component pick-up position for positioning the electronic component at a predetermined position in the pocket of the carrier tape by magnetic force. In the present invention configured as above, the electronic component can be held at the pickup position without the shutter mechanism, and can be accurately positioned at a predetermined position in the carrier tape pocket.

  According to the electronic component supply apparatus of the present invention, there is no backlash, there is a degree of freedom in design, and it is thin and highly accurate, which can hold and position components within the carrier tape.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the carrier tape used for the electronic component supply apparatus of this invention is demonstrated with reference to FIG. Fig.1 (a) is a top view of a carrier tape, FIG.1 (b) is sectional drawing. The carrier tape 1 includes a tape body 2, a pocket 6 for storing an electronic component 4 provided on the tape body 2, a cover tape 8 that covers the pocket 6 while the electronic component 4 is stored, and an index wheel 44 described later. The sprocket hole 10 is engaged with the index portion 44a.

  Next, a first embodiment of the electronic component supply apparatus of the present invention will be described with reference to FIGS. FIG. 2 is an overall front view showing a first embodiment of the electronic component supply device of the present invention, FIG. 3 is an enlarged partial front view showing the electronic component supply device according to the first embodiment of the present invention, and FIG. FIG. 5 is a partially enlarged front view showing the vicinity of a component pickup position in the first embodiment, and FIG. 5 is a partially enlarged front view showing positioning of the electronic component by a magnet in the electronic component supply apparatus according to the first embodiment of the present invention.

  As shown in FIG. 2, the electronic component supply device 20 according to the first embodiment includes an electronic product supply device main body 22 and a tape reel holder 24 provided integrally with one end of the main body 22. A tape reel 26 around which the carrier tape 1 that houses the electronic component 4 is wound is attached to the tape reel holder 24.

  A component pickup position 28 for the electronic component 4 is set in the main body 22. The carrier tape 1 is fed in the direction of the arrow 30 toward the pickup position 28. A cover tape recovery device 32 for recovering the cover tape 8 that has been peeled off before the component pickup position 28 is attached to the upstream side of the component pickup position of the main body 22 (upper part of the one end side of the main body 22). .

  The electronic component supply device 20 includes a carrier tape drive device 34 for sending the electronic component 4 accommodated in the carrier tape 1 to the component pickup position 28. Further, since the carrier tape 1 after the electronic component 4 is picked up and taken out at the component pickup position 28 becomes a scrap tape 36, a scrap tape guide 38 for discharging the scrap tape 36 to the outside is provided. It has been.

  Further, a magnet 40 (see FIG. 4) described later is disposed at the component pickup position 28. By this magnet, the electronic component 4 is prevented from jumping out and the pickup position is accurately positioned.

  As shown in FIG. 3, the carrier tape drive device 34 of the electronic component supply device 20 according to the present embodiment includes an electric motor 42 as a single drive source, an index wheel 44 for feeding the carrier tape 1, and an electric motor. The crank mechanism 46 is configured to transmit the driving force from the index wheel 44 to the index wheel 44.

  The index wheel 44 has an index portion 44a on the outer periphery, and the index portion 44a is inserted into or engaged with the sprocket hole 10 of the carrier tape 1 described above, and when the index wheel 44 rotates, the carrier tape The electronic component 4 stored in one pocket 6 is sent to the component pickup position 28.

  In the present embodiment, the rotation shaft 42a of the electric motor 42 and the rotation shaft 44b of the index wheel 44 are connected by the crank mechanism 46, so that the index wheel 44 located away from the electric motor 42 can be connected without a plurality of intermediate gears. Can be directly rotated.

  The crank mechanism 46 includes a main crank 48 whose one end is rotatably connected to the rotating shaft 42a of the electric motor 42, a sub crank 50 whose one end is rotatably connected to the rotating shaft 44b of the index wheel 44, and the like. A connecting member 52 rotatably connected to the other end of each of the main crank 48 and the sub crank 50. Here, the main crank 48 and the sub crank 50 have the same length, the distance between the connecting positions of the connecting members 52 of the main crank 48 and the sub crank 50, the rotation shaft 42a of the electric motor 42, and the index wheel 44. By setting the distance to the rotation shaft 44b to be equal, as a result, when the rotation shaft 42a of the electric motor 42 rotates by a predetermined angle, the rotation shaft of the index wheel 44 passes through the main crank 48, the connecting member 52, and the sub crank 50. 44b rotates by the same angle.

  Next, as shown in FIG. 4, the magnet 40 described above is provided below the electronic component 4 at the component pickup position 28 by being separated from the electronic component 4 by a predetermined distance. The magnet holder 54 is fixedly arranged at the center of the magnet holder 54 that is a member, and the magnet holder 54 is attached to the main body 22 via a mounting plate 58 with screws 56. The distance between the electronic component 4 and the magnet 40 can be changed to a desired value by adjusting the vertical direction of the magnet holder 54.

  In FIG. 4, the magnet position substantially coincides with the component pickup position 28 and the vertical position can be adjusted. However, the magnet position may be adjusted left and right at a position away from the component pickup position 28.

  Here, the distance between the electronic component 4 and the magnet 40 is the magnetic force attracted to the electronic component 4 by the magnet 40 depending on the size of the electronic component 4 and the change in the content of the magnetic material contained in the electrode of the electronic component 4. Therefore, the distance is set so that an optimum condition can be created for each electronic component.

  As shown in FIG. 4, an electronic component pickup nozzle 60 of an electronic component automatic mounting apparatus (not shown) is waiting above the component pickup position 28, and this electronic component pickup nozzle 60 is at a predetermined timing. The electronic component 4 accommodated in the pocket 6 of the carrier tape 1 is picked up by the vacuum suction force.

  Next, as shown in FIG. 5, when the electronic component 4 accommodated in the carrier tape 1 is sent to the component pickup position 28 by the index wheel 44, the electronic component 4 is transferred to the carrier tape 1 by the magnetic force of the magnet 40. By moving toward and in contact with the front wall 6a of the pocket 6, the movement in the pocket 6 is constrained and positioned with high accuracy. The electronic component 4 is picked up by the electronic component pickup nozzle 60 at this position.

  In addition to this position, the electronic component 4 may be positioned, for example, at a position in contact with the rear surface of the pocket 6 or at the center position of the pocket 6 so as to coincide with the center position of the magnet 40 and the component pickup position. In other words, the purpose is to be able to adjust the magnet position to the optimum position so that a highly reliable pickup can be performed, depending on the strength and arrangement position of the magnetic material of the electronic component 4.

  Next, the operation of the electronic component supply apparatus according to the first embodiment of the present invention described above will be described. First, when the electric motor 42 of the carrier tape driving device 34 is operated, the driving force is applied to the rotating shaft 42 a of the electric motor 42, the main crank 48, the connecting member 52, the sub crank 50, and the rotating shaft 44 b of the index wheel 44. As a result, the index wheel 44 is rotationally driven. As a result, the electronic component 4 accommodated in the carrier tape 1 is sent out from the tape reel 26 to the component pickup position 28 by one pitch in the direction indicated by the arrow 30. At this time, the cover tape 8 is torn before the component pickup position 28, and the torn cover tape 8 is collected by the cover tape collecting device 32.

  When the electronic component 4 to be picked up reaches the component pickup position 28, the operation of the carrier tape driving device 34, that is, the rotation of the index wheel 44 is stopped, and the electronic component 4 is moved to a predetermined position by the magnetic force of the magnet 40. Is positioned with high accuracy. In the present embodiment, the inertial force acts on the electronic component 4 by stopping the rotation of the index wheel 44, but the magnitude of the magnetic force of the magnet 40 is set so as to overcome the inertial force. It is possible to position the electronic component 4 at a predetermined position with certainty and accuracy without causing the electronic component 4 to move in the pocket 6 due to inertial force.

  At the component pickup position 28, the electronic component pickup nozzle 60 descends and picks up the electronic component 4 by a vacuum suction force. Thereafter, the electric motor 42 of the carrier tape drive 34 is activated again, and the same operation is repeated. The carrier tape 1 from which the electronic component 4 has been picked up becomes a scrap tape 36, passes through the scrap tape guide 36, and is discharged to the outside.

  According to the electronic component supply device 20 according to the first embodiment of the present invention described above, the index wheel 44 can be accurately rotated only by the crank mechanism 46 regardless of the distance and the arrangement position of the index wheel 44 and the electric motor 42. And a plurality of intermediate gears can be omitted, and the cost can be reduced. Further, since it is not necessary to calculate the number of intermediate gears, the gear ratio, and the size, the degree of freedom in design increases. By reducing the number of intermediate gears, the weight is reduced and the inertial force is also reduced.

  Next, an electronic component supply apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is an enlarged partial front view showing an electronic component supply apparatus according to the second embodiment of the present invention. As shown in FIG. 6, the second embodiment employs a planet crank mechanism 62 as a crank mechanism and an encoder 64 in addition to the index wheel 44 as a rotating member.

  The planet crank mechanism 62 according to the present embodiment includes a main crank 48 whose one end is rotatably connected to the motor rotation shaft 42a of the electric motor 42, and a polygonal member rotatably connected to the other end of the main crank 48. (Connecting member) 65, a sub crank 50 of the index wheel 44 rotatably connected to the polygonal member 65, and an encoder crank 66 rotatably connected to the polygonal member 65.

  Here, the encoder 64 is for detecting the rotational position of the electric motor 42. In the second embodiment, in addition to or instead of the encoder 64, a rotating member that detects the rotational position of the electric motor with a sensor may be used. It may be a rotating member.

  In the electronic component supply apparatus according to the second embodiment of the present invention, when the electric motor 42 rotates by a predetermined angle, the index wheel 44 and the encoder 64 rotate through the planet crank mechanism 62 by the same angle. . Since the position of the rotary shaft 64a of the encoder 64 is not concentric with the rotary shaft 42a of the electric motor 42, there is a degree of freedom in designing a narrow feeder.

  Here, the position of the index wheel, the distance between the motors, and the positional relationship are determined by the size, number, and gear ratio of the intermediate gears, and the degree of freedom in design is small. Moreover, the increase in the number of intermediate gears reduces accuracy and increases costs due to backlash between the gears.

  However, according to the electronic component supply apparatus according to the second embodiment of the present invention, by adopting the planet crank mechanism 62, it is possible to make a tape feeder with high design freedom, low cost, and high accuracy. In addition, a device for confirming the rotational angle position such as the encoder 64 does not need to be installed concentrically with the electric motor 42, so that a thin and thin tape feeder can be made. Instead of an encoder, a disk-shaped member for checking a rotational angle position by a sensor may be used with a slit or a hole. Of course, a sensor may be directly attached in the vicinity of the index wheel 44, and a slit or a hole for checking the rotational angle position may be opened in the index portion 42a of the index wheel 44 or the index wheel 44 to detect the position.

  Next, an electronic component supply apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is an enlarged partial front view showing an electronic component supply apparatus according to a third embodiment of the present invention. As shown in FIG. 7, in the third embodiment, an intermediate gear is provided between the electric motor 42 and the main crank 48. The index wheel 44 needs to send the electronic component 4 stored in the carrier tape 1 intermittently at high speed. For example, it is assumed that the carrier tape 1 is fed at a high speed over a distance of 2 mm to 4 mm at intervals of 50 milliseconds. In this case, the torque applied to the index wheel 44 and the motor 42 is several kg. It may be assumed that it takes cm.

  When an inexpensive flat stepping motor is used as the electric motor 42, the motor may step out with the above torque. In order to reduce the load applied to the electric motor 42, intermediate gears 68, 70 and 72 are provided between the electric motor 42 and the main crank 48. If the gear ratio of the intermediate gear 68 concentrically attached to the rotating shaft 42a of the electric motor 42 and the intermediate gear 72 attached to the main crank 48 is 1:16, the load applied to the electric motor 42 is about 1/16. Reduced. In this case, it is only necessary to consider only the gear ratio of the intermediate gears 68 and 72 provided between the electric motor 42 and the main crank 48 regardless of the distance between the index wheel 44 and the electric motor 42 and the arrangement position. In this case as well, the position of the electric motor 42 can be freely determined and the degree of freedom in design remains high.

  The intermediate gear 70 is installed between the intermediate gear 68 and the intermediate gear 72, and functions to remove backlash by pressing the intermediate gear 68 and the intermediate gear 72 with a spring 74 or the like. Although a method for taking backlash is not shown, there is a method in which the intermediate gear 68 is directly pressed against the intermediate gear 72 with a spring or the like without using the intermediate gear 70, and other methods are also conceivable.

Fig.1 (a) is a top view of a carrier tape, FIG.1 (b) is sectional drawing. 1 is an overall front view showing a first embodiment of an electronic component supply device of the present invention. It is an enlarged partial front view which shows the electronic component supply apparatus by 1st Embodiment of this invention. It is a partial enlarged front view which shows the vicinity of the component pick-up position in 1st Embodiment of this invention. It is a partial enlarged front view which shows positioning of the electronic component by the magnet in the electronic component supply apparatus by 1st Embodiment of this invention. It is an enlarged partial front view which shows the electronic component supply apparatus by 2nd Embodiment of this invention. It is an enlarged partial front view which shows the electronic component supply apparatus by 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carrier tape 2 Tape main body 4 Electronic component 6 Pocket 8 Cover tape 10 Sprocket hole 20 Electronic component supply apparatus 22 Electronic product supply apparatus main body 24 Tape reel holder 26 Tape reel 28 Component pick-up position 30 Arrow 32 Cover tape collection | recovery apparatus 34 Carrier tape drive Device 36 Scrap tape 38 Scrap tape guide 40 Magnet 42 Electric motor 42a Electric motor rotating shaft 44 Index wheel 44a Index portion 44b Index wheel rotating shaft 46 Crank mechanism 48 Main crank 50 Sub crank 52 Connecting member 54 Magnet holder 56 Screw 58 Mounting Plate 60 Electronic component pickup nozzle 62 Planet crank mechanism 64 Encoder 64a Encoder rotating shaft 65 Polygonal member 66 Encoder Crank 68, 70, 72, intermediate gear 74 Spring

Claims (5)

  An electronic component supply device for supplying an electronic component stored in a carrier tape, comprising: an index wheel means for transporting the electronic component stored in the carrier tape to a component pickup position; and a single unit for driving the index wheel means. An electric motor that is one drive source, and a crank mechanism that is disposed between the index wheel means and the electric motor and that transmits a rotational driving force from the electric motor to a rotation shaft of the index wheel means. The crank mechanism includes a main crank having one end rotatably connected to the rotating shaft of the electric motor, and one end rotatably connected to the rotating shaft of the index wheel means and having the same length as the main crank. The sub crank and the other end of each of the main crank and the sub crank are rotatably connected. A connecting member, and when the electric motor rotates a predetermined angle, the main crank, the connecting member, the sub crank, and the index wheel means are configured to rotate by the same angle. An electronic component supply device.   The crank mechanism is a planetary crank mechanism, and the connecting member of the planetary crank mechanism is a polygonal member and can rotate on each of one or a plurality of rotating members other than the electric motor and the index wheel means. Furthermore, the cranks of the one or more rotating members have the same length as the main crank and the sub crank, and when the electric motor rotates by a predetermined angle, the main crank and the connecting member 2. The electronic component supply apparatus according to claim 1, wherein the sub crank, the index wheel means, and the one or more rotating members are configured to rotate by the same angle.   The electronic component supply apparatus according to claim 1 or 2, wherein at least one of the rotating members including the index wheel means is attached with position detecting means for detecting a rotational position of the electric motor.   The electronic component supply apparatus according to any one of claims 1 to 3, wherein the main crank is connected to a rotating shaft of the electric motor via one or a plurality of gears.   5. The electronic component supply apparatus according to claim 1, further comprising magnet means provided in the vicinity of the component pickup position for positioning the electronic component at a predetermined position in the pocket of the carrier tape by a magnetic force.

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