Tape feeder

Abstract

To suppress occurrence of a winding defect by winding a cover tape around a drum member with a proper tension.SOLUTION: In a tape feeder, a component supply tape configured by adhering a cover tape onto a carrier tape, on which a plurality of components is accommodated, is pulled out of a reel and fed to a predetermined supply position and the cover tape is released from the carrier tape before the supply position, such that the components on the carrier tape are exposed. The tape feeder comprises: a pair of rotary members which releases the cover tape from the carrier tape by holding and pulling in the cover tape; a drum member which winds the cover tape pulled in by the pair of rotary members around it while rotating; and a torque limiter which is provided in a rotary shaft of the drum member.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] This specification discloses a tape feeder. [Background technology]

[0002] Conventionally, a tape feeder of this type has been proposed that includes a take-up reel that takes up the cover tape peeled off from a carrier tape containing components (see, for example, Patent Document 1). The take-up reel includes a first flange that is a drive-side flange having a boss portion, a second flange that is detachably coupled to the first flange, and a take-up portion that is provided on the second flange and has an expandable outer periphery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-296951 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the take-up reel is configured without a flange or with a flange with a diameter smaller than the maximum take-up diameter due to installation space constraints, the cover tape taken up by the take-up reel is not guided in the width direction. Therefore, if the tension of the taken-up cover tape is not appropriate, the cover tape may be taken up on the reel (drum member) in a misaligned state in the width direction. In this case, the taken-up cover tape may come into contact with the inner wall of the case, etc., and an excessive load may be placed on the drive source, resulting in poor winding.

[0005] A primary object of the present disclosure is to prevent winding defects by winding the cover tape around a drum member with an appropriate tension. [Means for solving the problem]

[0006] The present disclosure has adopted the following means to achieve the above-mentioned main object.

[0007] The tape feeder of the present disclosure comprises: A tape feeder that unwinds a component supply tape, which is a carrier tape accommodating a plurality of components and has a cover tape attached thereto, from a reel, feeds the component supply tape to a predetermined supply position, and peels the cover tape off the carrier tape just before the supply position, thereby exposing the components on the carrier tape, a pair of rotating members that sandwich and pull the cover tape to peel the cover tape off the carrier tape; a drum member that rotates and winds up the cover tape drawn in by the pair of rotating members; a torque limiter provided on a rotation shaft of the drum member; The gist of the project is to provide the following:

[0008] The tape feeder disclosed herein includes a pair of rotating members that sandwich and pull in the cover tape to peel the cover tape from the carrier tape, and a drum member that rotates and winds up the pulled-in cover tape. A torque limiter is provided on the rotating shaft of the drum member. The torque limiter slips when torque exceeding a specified value is applied to the drum member, thereby preventing excessive tension from acting on the cover tape being wound around the drum member. As a result, the cover tape is wound around the drum member with appropriate tension, thereby preventing winding defects. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic configuration diagram of a component mounter. [Figure 2] FIG. 2 is a schematic diagram of a tape feeder. [Figure 3] FIG. 2 is a block diagram showing the electrical connection relationship between a mounting machine control device and a feeder control device. [Figure 4] FIG. 2 is a schematic diagram of a cover tape winding mechanism. [Figure 5]FIG. [Figure 6] FIG. 4 is a cross-sectional view of the cover tape wound around the drum body. [Figure 7] FIG. 1 is a schematic diagram illustrating an extension tape including a clamper. [Figure 8] FIG. 2 is a cross-sectional view of the second block. [Figure 9] 10 is an explanatory diagram showing how a cover tape is joined to an extension tape. FIG. [Figure 10] 10 is an explanatory diagram showing how a cover tape is joined to an extension tape. FIG. [Figure 11] FIG. 2 is an explanatory diagram showing the arrangement of a tape reel and a recovery drum. [Figure 12] 10 is an explanatory diagram showing the relationship between the sum of the winding radius of the tape reel and the winding radius of the recovery drum and the amount of cover tape recovered. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Next, embodiments of the present disclosure will be described with reference to the drawings.

[0011] FIG. 1 is a schematic diagram of a component mounter. FIG. 2 is a schematic diagram of a tape feeder. FIG. 3 is a block diagram showing the electrical connection between a mounter control device and a feeder control device. FIG. 4 is a schematic diagram of a cover tape winding mechanism. FIG. 5 is a cross-sectional view of a recovery drum. FIG. 6 is a cross-sectional view of cover tape wound around a drum body. FIG. 7 is a schematic diagram of an extension tape including a clamper. FIG. 8 is a cross-sectional view of a second block. In FIG. 1, the left-right direction is the X-axis direction, the front-rear direction is the Y-axis direction, and the up-down direction is the Z-axis direction.

[0012] As shown in FIG. 1, the component mounter 10 includes a mounter control device 11 (see FIG. 3), a mounter main body including a board transport device 12, a head 13, and a head moving device 14, and a tape feeder 20 detachable from the mounter main body. The board transport device 12 transports a board S using a belt conveyor. The head 13 has a suction nozzle that can move up and down in the vertical direction (Z-axis direction), and picks up components onto the suction nozzle to mount them on the board S transported by the board transport device 12. The head moving device 14 moves the head 13 horizontally (X-axis direction and Y-axis direction). The mounter main body also includes a part camera 15 and a mark camera 16. The part camera 15 captures images of components picked up by the suction nozzle from below to detect suction misalignment. The mark camera 16 is installed on the head 13 or the head moving device 14, and captures images of reference marks attached to the board S from above to detect the position of the transported board S. The mounter control device 11 is composed of a known CPU, ROM, RAM, etc. The mounter control device 11 outputs control signals to the board transport device 12, head 13, head moving device 14, etc., and inputs image pickup signals from the parts camera 15 and mark camera 16.

[0013] As shown in Fig. 2, the tape feeder 20 is detachably held on a feeder stand (not shown) provided on the front side of the mounting machine main body. The tape feeder 20 includes a feeder control device 21 (see Fig. 3), a connector 22, a tape reel 30, a tape feeding mechanism 40, and a cover tape winding mechanism 50. These are housed in a rectangular feeder case 20a.

[0014] The feeder control device 21 is configured with a known CPU, ROM, RAM, etc. As shown in Fig. 3, the feeder control device 21 outputs a drive signal to the tape feeding mechanism 40 (drive motor 42 described later) and the cover tape take-up mechanism 50 (drive motor 52 described later). The feeder control device 21 also inputs a detection signal from a tension detection sensor 55 described later. The feeder control device 21 is capable of communicating with the mounter control device 11 of the component mounter 10 to which the tape feeder 20 is attached via the connector 22.

[0015] The tape reel 30 includes a core 31 around which a component supply tape 34, with a cover tape 36 attached to the surface of the carrier tape 35, is wound, and a pair of reel flanges 32 provided on both sides of the core 31. The carrier tape 35 has a plurality of cavities formed in it, aligned at predetermined intervals in the longitudinal direction. Each cavity contains a component. These components are protected by the cover tape 36 attached to the carrier tape 35.

[0016] The tape feeding mechanism 40 pulls out the carrier tape 35 (component supply tape 34) from the tape reel 30 and feeds it to the component supply position. The tape feeding mechanism 40 has a sprocket 41 with engaging pawls on its outer periphery that engage with sprocket holes formed at equal intervals in the carrier tape 35, and a drive motor 42 (e.g., a stepping motor) that rotates the sprocket 41. The tape feeder 20 drives the sprocket 41 by a predetermined number of rotations using the drive motor 42 to feed out the carrier tape 35 engaged with the sprocket 41 by a predetermined amount, thereby sequentially supplying the components contained on the carrier tape 35 to the component supply position. The cover tape 36 of the components contained on the carrier tape 35 is peeled off just before the component supply position, so that the components are exposed at the component supply position and are picked up by the suction nozzle. The cover tape 36 attached to the carrier tape 35 is folded back in the opposite direction to the feed direction of the carrier tape 35 just before the component supply position, and is peeled off from the carrier tape 35 by being fed in the opposite direction by the cover tape winding mechanism 50.

[0017] As shown in FIG. 4, the cover tape winding mechanism 50 includes a pair of winding gears 51a, 51b, a drive motor 52 (e.g., a stepping motor), a plurality of first transmission gears 53a to 53c, a plurality of second transmission gears 54a to 54d, and a collection drum 60.

[0018] The pair of take-up gears 51a, 51b mesh with each other and are installed in the feeder case 20a on the opposite side of the end of the carrier tape 35 in the feed direction (rightward in FIG. 2). Of the pair of take-up gears 51a, 51b, one take-up gear 51a is a drive gear that rotates by torque transmitted from the drive motor 52. The other take-up gear 51b is a driven gear that rotates in the opposite direction as the one take-up gear 51a rotates. The pair of take-up gears 51a, 51b are rotated in the opposite directions by the torque from the drive motor 52 with the cover tape 36 sandwiched between them. As a result, the cover tape 36, which has been folded back in the direction opposite to the feed direction of the carrier tape 35, is fed in the opposite direction and peeled off from the carrier tape 35. A tension detection sensor 55 is provided upstream of the pair of take-up gears 51a, 51b in the feed direction of the cover tape 36. The tension detection sensor 55 outputs an ON signal when tension exceeding a predetermined tension acts on the cover tape 36.

[0019] As shown in FIG. 2, the recovery drum 60 is installed below the pair of take-up gears 51a, 51b and in close proximity to the outer edge of the reel flange 32. As shown in FIG. 5, the recovery drum 60 has a drum main body 61, a drum shaft 62 that forms the rotation axis of the drum main body 61, and a torque limiter 63 (e.g., a spring-type torque limiter). A drum gear 62a is attached to the drum shaft 62, and torque from the drive motor 52 is transmitted to the drum main body 61. The drum main body 61 has a winding core 61a around which the cover tape 36 is wound, and a pair of drum flanges 61b (small diameter flanges) provided on both sides of the winding core 61a. The drum main body 61 is rotated by the torque transmitted from the drive motor 52, and thereby winds the cover tape 36 fed by the pair of take-up gears 51a, 51b onto the winding core 61a and recovers it.

[0020] Motor gear 52a attached to the rotary shaft of drive motor 52 meshes with take-up gear 51a via a plurality of first transmission gears 53a to 53c, in which adjacent gears mesh with each other. Furthermore, motor gear 52a meshes with drum gear 62a via a plurality of second transmission gears 54a to 54d, in which adjacent gears mesh with each other. As a result, torque from drive motor 52 is distributed to take-up gear 51a and drum gear 62a at a predetermined torque ratio, and the pair of take-up gears 51a, 51b and collection drum 60 (drum main body 61) are each rotated. In this embodiment, the first transmission gears 53a to 53c and the second transmission gears 54a to 54d are configured so that the torque distributed from the drive motor 52 to the take-up gear 51a is greater than the torque distributed to the drum body 61 (the torque distributed from the drive motor 52 to the drum body 61 is less than the torque distributed to the take-up gear 51a). In other words, the first transmission gears 53a to 53c and the second transmission gears 54a to 54d are configured so that the rotational speed ratio of the second transmission gears 54a to 54d (the ratio of the rotational speed on the drum body 61 side to the rotational speed on the drive motor 52 side) is greater than the rotational speed ratio of the first transmission gears 53a to 53c (the ratio of the rotational speed on the take-up gear 51a side to the rotational speed on the drive motor 52 side). As a result, the cover tape winding mechanism 50 can share the drive source and impart tension to the cover tape 36 that is suitable for peeling when peeling the cover tape 36 from the carrier tape 35, and can impart tension to the cover tape that is suitable for winding when winding and recovering the cover tape 36.

[0021] As shown in FIG. 5 , the torque limiter 63 is disposed between the drum body 61 and the drum shaft 62. The torque limiter 63 slips when a torque exceeding a predetermined value acts on the drum body 61. For example, the torque limiter 63 may be configured as a spring-type torque limiter. This prevents excessive tension from acting on the cover tape 36 when the cover tape 36 is wound around the drum body 61. When the cover tape 36 is peeled from the carrier tape 35, adhesive or tape scraps may be attached to the cover tape 36. The cover tape 36 with the contact material or tape scraps attached has an uneven thickness in the width direction. Therefore, in a recovery drum 60B without a torque limiter, the cover tape 36 may be wound around the drum body 61 with excessive tension. In this case, as shown in FIG. 6 , the cover tape 36 is prone to shifting in the width direction due to its uneven thickness. If the cover tape 36 wound around the drum body 61 is misaligned in the width direction, the cover tape 36 may slide against the inner wall of the feeder case 20a, overloading the drive motor 52 and causing winding problems. In this embodiment, the cover tape winding mechanism 50 is configured so that the torque distributed from the drive motor 52 to the drum body 61 is smaller than the torque distributed to the winding gear 51a, and also so that the drum body 61 slips when excessive torque acts on the drum body 61. This allows the cover tape 36 to be wound around the drum body 61 with appropriate tension, preventing winding problems.

[0022] As shown in Figure 7, an extension tape 65 is connected to the winding core 61a around which the cover tape 36 of the drum main body 61 is wound. The extension tape 65 is used to make up for the shortfall in the length of the leader portion cover tape when it is shorter than the distance from the peeling position of the cover tape 36 to the recovery drum 60. In particular, the extension tape 65 is necessary for a partially used tape reel 30 because it does not have a leader portion.

[0023] A tape-splicing clamper 70 is provided at the tip of the extension tape 65 to join it to the tip of the cover tape 36. The clamper 70 includes a first block 71 fixed to the tip of the extension tape 65, a looped (U-shaped) wire 75 fixed to the tip of the first block 71, and a second block 72 slidable in the direction of extension of the wire 75. Gear teeth 71a, 72a that mesh with the take-up gear 51a are formed on one side of the first block 71 and the second block 72 so that the wire 75 can pass between the pair of take-up gears 51a, 51b. As shown in FIG. 8, the second block 72 is formed with insertion holes 72b, 72c spaced apart in the width direction and through which two straight portions of the wire 75 are inserted. The second block 72 also has a recess 72d that communicates with the insertion holes 72b, 72c and into which the looped tip of the wire 75 fits. The tip of the extension tape 65 and the tip of the cover tape 36 are joined by passing the tip of the cover tape 36 through the loop of the wire 75 (see FIG. 9) and then sliding the second block 72 toward the tip of the loop to tighten the loop. As a result, as shown in FIG. 10, the cover tape 36 is folded back by the loop of the wire 75, and the folded back portion enters into the recess 72d of the second block 72, thereby being clamped. Note that gear teeth 71a, 72a are formed on one side of the first block 71 and the second block 72, making it easy to distinguish between the front and back of the extension tape 65. The drum body 61 is rotated with the tip of the extension tape 65 and the tip of the cover tape 36 joined together, thereby winding up and recovering the cover tape 36 together with the extension tape 65.

[0024] Small-diameter drum flanges 61b are provided on both sides of the winding core 61a of the drum main body 61. The extension tape 65 is guided by the drum flanges 61b when it is wound onto the winding core 61a. However, because the drum flanges 61b have a small diameter, the cover tape 36 is not guided by the drum flanges 61b when it is wound onto the winding core 61a. Furthermore, because the drum main body 61 is installed close to the outer edges of the reel flanges 32, the cover tape 36 is wound forward so as to enter the interior of the pair of reel flanges 32, as shown in FIG. 5. This allows the tape feeder 20 to be made even more compact.

[0025] Here, when installing the recovery drum 60, the closer the recovery drum 60 is to the tape reel 30, the shorter the center-to-center distance L (see FIG. 10) between the tape reel 30 and the recovery drum 60, allowing for a more compact tape feeder 20. However, to prevent tape interference, the center-to-center distance L needs to be set longer than the total radius R, which is the sum of the winding radius of the component supply tape 34 remaining on the tape reel 30 and the winding radius of the cover tape 36 recovered on the recovery drum 60. As shown in FIG. 12, the total radius R reaches a peak value Rpeak not when the amount of cover tape 36 recovered by the recovery drum 60 is zero, but when a predetermined amount α of cover tape 36 has been recovered. For this reason, the recovery drum 60 is installed as close to the tape reel 30 as possible within a range in which the center-to-center distance L is longer than the peak value Rpeak. The peak value Rpeak of the total radius R may be calculated based on the specifications of the longest tape that can be loaded onto the tape reel 30 so that the cover tape 36 recovered onto the recovery drum 60 does not interfere with the tape remaining on the loaded tape reel 30.

[0026] Here, the correspondence between the main elements of this embodiment and the main elements described in the claims will be explained. That is, the tape reel 30 of this embodiment corresponds to the reel of the present disclosure, the pair of winding gears 51a, 51b correspond to the pair of rotating members, the drum main body 61 corresponds to the drum member, and the torque limiter 63 corresponds to the torque limiter. Also, the reel flange 32 corresponds to the reel flange, and the drum flange 61b corresponds to the flange.

[0027] It goes without saying that the present disclosure is not limited to the above-described embodiments, and can be embodied in various forms as long as they fall within the technical scope of the present disclosure.

[0028] For example, in the above-described embodiment, the pair of winding gears 51a, 51b are formed by gears, but they may also be formed by rollers.

[0029] In the above-described embodiment, the drum main body 61 has small-diameter drum flanges 61b on both sides of the winding core 61a, but it may have no drum flanges. In this way, the drum main body 61 can be located closer to the tape reel 30, and the tape feeder 20 can be further miniaturized.

[0030] As described above, the tape feeder of the present disclosure is a tape feeder that pulls out a component supply tape, which is a carrier tape containing a plurality of components and has a cover tape attached thereto, from a reel, feeds it to a predetermined supply position, and exposes the components on the carrier tape by peeling the cover tape from the carrier tape just before the supply position, and is equipped with a pair of rotating members that sandwich and pull in the cover tape to peel it off from the carrier tape, a drum member that rotates and winds up the cover tape pulled in by the pair of rotating members, and a torque limiter provided on the rotating shaft of the drum member.

[0031] The tape feeder disclosed herein includes a pair of rotating members that sandwich and pull in the cover tape to peel the cover tape from the carrier tape, and a drum member that rotates and winds up the pulled-in cover tape. A torque limiter is provided on the rotating shaft of the drum member. The torque limiter slips when torque exceeding a specified value is applied to the drum member, thereby preventing excessive tension from acting on the cover tape being wound around the drum member. As a result, the cover tape can be wound around the drum member with appropriate tension, preventing winding defects.

[0032] In the tape feeder of the present disclosure, it is more preferable that the reel has a pair of reel flanges, and the drum member has no flanges or a flange with a diameter smaller than the maximum winding diameter. This allows the tape feeder to be made smaller by placing the drum member close to the reel. Furthermore, since the cover tape can be wound onto the drum member with appropriate tension, the cover tape can be wound onto the drum member while suppressing misalignment in the width direction, even without a flange for guidance. In this case, it is more preferable that the drum member be positioned close to the outer edges of the pair of reel flanges so that a portion of the wound cover tape enters the pair of reel flanges. This allows the tape feeder to be made even more compact.

[0033] The tape feeder of the present disclosure may also include a feeder case that houses the reel, the pair of rotating members, and the drum member. [Industrial Applicability]

[0034] The present disclosure can be used in industries such as the manufacturing of tape feeders and component mounters. [Explanation of symbols]

[0035] 10 component mounter, 11 mounter control device, 12 substrate transport device, 13 head, 14 head moving device, 15 parts camera, 16 mark camera, 20 tape feeder, 20a feeder case, 21 feeder control device, 22 connector, 30 tape reel, 31 winding core, 32 reel flange, 34 component supply tape, 35 carrier tape, 36 cover tape, 40 tape feeding mechanism, 41 sprocket, 42 drive motor, 50 cover tape winding mechanism, 51a, 51b winding gear, 52 drive motor, 52a motor gear, 53a to 53c first transmission gear, 54a to 54d second transmission gear, 55 tension detection sensor, 60, 60B recovery drum, 61 drum body, 61a winding core, 61b drum flange, 62 drum shaft, 62a Drum gear, 63 torque limiter, 65 extension tape, 70 clamper, 71 first block, 71a gear teeth, 72 second block, 72a gear teeth, 72b, 72c insertion holes, 72d recess, 75 wire, S substrate.

Claims

1. A tape feeder that unwinds a component supply tape, which is a carrier tape accommodating a plurality of components and has a cover tape attached thereto, from a reel, feeds the component supply tape to a predetermined supply position, and peels the cover tape off the carrier tape just before the supply position, thereby exposing the components on the carrier tape, a pair of rotating members that sandwich and pull the cover tape to peel the cover tape off the carrier tape; a drum member that rotates and winds up the cover tape drawn in by the pair of rotating members; a torque limiter provided on a rotation shaft of the drum member; A tape feeder comprising:

2. 2. The tape feeder of claim 1, The reel has a pair of reel flanges, The drum member has no flange or has a flange with a diameter smaller than the maximum winding diameter. Tape feeder.

3. 3. The tape feeder according to claim 2, the drum member is disposed adjacent to the outer edges of the pair of reel flanges so that a portion of the wound cover tape enters into the pair of reel flanges. Tape feeder.

4. 4. The tape feeder according to claim 1, a feeder case that houses the reel, the pair of rotating members, and the drum member; Tape feeder.

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