Carrier tape transport device and tape feeder

Abstract

To provide a shareable carrier tape conveyance device capable of achieving high feed accuracy even when it is a thin type, and a tape feeder.SOLUTION: The carrier tape conveyance device includes: a frame the cross-section of which perpendicular to carrier tape transport direction is vertically long; a sprocket that has multiple radially projecting pins and a mounting hole opening in the center, which rotates while engaging with the feed hole of carrier tape; a radial bearing with an outer wheel attached in the mounting hole to support the sprocket in a rotatable manner; a thrust bearing sandwiched between the sprocket and the frame; and a shaft fixing part that urges the sprocket to the thrust bearing by pushing the radial bearing toward the frame. The radial bearing is arranged at a position that overlaps at least a portion of the thrust bearing in the radial direction.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a carrier tape conveying device for conveying a carrier tape and a tape feeder including the same. ,tree

Background Art

[0002] Conventionally, a component mounting device that picks up a component stored in a carrier tape with a mounting head and mounts it on a substrate Place is , Department known to have a tape feeder that supplies components to a component pickup position. This tape feeder incorporates a carrier tape conveying device for conveying the carrier tape.

[0003] For example, the carrier tape conveying device described in Patent Document 1 reduces the inclination of the sprocket that feeds out the carrier tape by pivotally supporting one gear with one sprocket fixed thereon in the thrust direction by two ball bearings, and improves the feeding accuracy in the direction perpendicular to the tape feeding.

Prior Art Documents

Patent Documents

[0004] [[ID=3;]]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, there are various types of carrier tapes according to component sizes and shapes, and correspondingly, a plurality of types of tape feeders are also prepared. In these tape feeders, efforts have been made to reduce manufacturing costs by achieving as much commonality of components and structures as possible among different types, and the carrier tape conveying device is no exception.

[0006] ​However, conventional carrier tape transport systems have a limited range of tape feeders that can be used with the same structure, thus limiting the reduction in manufacturing costs. In particular, carrier tapes for large parts have deep part storage compartments formed by embossing, so carrier tape transport systems equipped with two ball bearings aligned in the thrust direction require tape feeders with large sprockets that do not interfere with the part storage compartments. banana This was a major obstacle to standardization.

[0007] Furthermore, to achieve standardization, a single ball bearing could be used to support the sprocket, making the carrier tape transport device thinner and thus preventing interference with the component storage area. However, this would make the sprocket more prone to tilting, leading to reduced feed accuracy in the direction perpendicular to the tape feed, and also causing torque loss due to the side of the sprocket contacting adjacent components.

[0008] Therefore, the purpose of this disclosure is to solve the above-mentioned conventional problems by providing a carrier tape transport device and a tape feeder equipped therewith that can be standardized and achieve high feeding accuracy even in a thin form. [Means for solving the problem]

[0009] The carrier tape conveying device of this disclosure conveys a carrier tape that houses components and has feed holes provided at a predetermined pitch. The carrier tape conveying device comprises a frame, a sprocket, a radial bearing, a thrust bearing, and a shaft fixing part. The frame has a conveying surface that supports and guides the carrier tape to be conveyed from below, and has a vertically elongated cross section perpendicular to the conveying direction of the carrier tape, and has a pair of sides that extend vertically and horizontally along the conveying direction. The sprocket has a plurality of radially protruding pins and a mounting hole opening in the center, and conveys the carrier tape by rotating while engaging with the feed holes of the carrier tape. The radial bearing has an outer ring and an inner ring, and the outer ring is attached to the mounting hole to support the sprocket so that it can rotate around a rotation axis perpendicular to the conveying direction of the carrier tape relative to the frame. The thrust bearing is sandwiched between the sprocket and the frame, and the shaft fixing part biases the sprocket against the thrust bearing by pressing the radial bearing toward the frame. The radial bearing is positioned so as to overlap at least a portion of the thrust bearing in the radial direction.

[0010] The tape feeder of this disclosure is a tape feeder that transports a carrier tape having feed holes at a predetermined pitch and supplies components stored on the carrier tape to a component supply position. The tape feeder is equipped with the carrier tape transport device described above, and the carrier tape transport device transports the carrier tape and supplies components to the component supply position. [Effects of the Invention]

[0011] According to this disclosure, it is possible to provide a carrier tape transport device and a tape feeder equipped therewith that can be standardized and achieve high feeding accuracy even in a thin form. [Brief explanation of the drawing]

[0012] [Figure 1] Schematic diagram of a component mounting device according to one embodiment of the present disclosure. [Figure 2] Schematic diagram of a tape feeder according to one embodiment of the present disclosure [Figure 3]Partial plan view around the component extraction position of the tape feeder [Figure 4] Explanatory drawing showing a schematic cross-section of the arrow view V in FIG. 2 [Figure 5] YZ plan view of the carrier tape conveyance device [Figure 6] Longitudinal cross-sectional view in the XZ plane of the carrier tape conveyance device [Figure 7] Partial enlarged perspective view of the carrier tape conveyance device [Figure 8] Exploded cross-sectional view of the carrier tape conveyance device [Figure 9] Partial longitudinal cross-sectional view of the main frame [Figure 10] Exploded cross-sectional view of the second sprocket [Figure 11] Perspective view of the radial bearing [Figure 12] Perspective view of the thrust bearing [Figure 13] Partial longitudinal cross-sectional view of the carrier tape conveyance device [Figure 14] Schematic perspective view of the carrier tape [Figure 15] Partial longitudinal cross-sectional view in the YZ plane of the tape feeder [Figure 16] Partial longitudinal cross-sectional view in the XZ plane of the tape feeder in the modified example [Figure 17] Partial longitudinal cross-sectional view in the XZ plane of the tape feeder in the modified example

Mode for Carrying Out the Invention

[0013] According to a first aspect of this disclosure, a carrier tape conveying device conveys a carrier tape that houses components and has feed holes at a predetermined pitch. The carrier tape conveying device comprises a frame, a sprocket, a radial bearing, a thrust bearing, and a shaft fixing part. The frame has a conveying surface that supports and guides the carrier tape to be conveyed from below, and has a vertically elongated cross-section perpendicular to the conveying direction of the carrier tape, and has a pair of sides that extend vertically and horizontally along the conveying direction. The sprocket has a plurality of radially protruding pins and a mounting hole opening in the center, and conveys the carrier tape by rotating while engaging with the feed holes of the carrier tape. The radial bearing has an outer ring and an inner ring, and the outer ring is attached to the mounting hole to support the sprocket so that it can rotate around a rotation axis perpendicular to the conveying direction of the carrier tape relative to the frame. The thrust bearing is sandwiched between the sprocket and the frame, and the shaft fixing part biases the sprocket against the thrust bearing by pressing the radial bearing toward the frame. The radial bearing is positioned so as to overlap at least a portion of the thrust bearing in the radial direction.

[0014] In the carrier tape conveying device of the first embodiment, a radial bearing is arranged to reduce friction in the radial direction, and a thrust bearing is arranged to reduce friction in the thrust direction, with different bearings being arranged for each direction of friction. This makes it possible to achieve high accuracy in feeding the carrier tape. Furthermore, since the outer ring of the radial bearing is attached to the mounting hole of the sprocket, and the radial bearing is positioned to overlap with at least a part of the thrust bearing in the radial direction, the width of the carrier tape conveying device in the thrust direction can be reduced, making it thinner. In addition, since the thinner carrier tape conveying device can convey carrier tapes with deep bosses, it can be used as a tape feeder for both carrier tapes for large parts and carrier tapes for small parts.

[0015] According to a second aspect of this disclosure, the carrier tape conveying device described in the first aspect is provided, wherein the sprocket has an annular groove in which a thrust bearing is positioned radially outward from the mounting hole. By positioning the thrust bearing in the annular groove, the width of the carrier tape conveying device in the thrust direction can be made smaller.

[0016] A third aspect of the present disclosure provides a carrier tape conveying device according to the first or second aspect, wherein the frame has a recess formed on one side and a shaft portion that protrudes in a position surrounded by the recess and is inserted into an inner ring, and a sprocket mounted on a radial bearing is housed in the recess. Since the shaft portion that is inserted into the inner ring protrudes in a position surrounded by the recess that houses the sprocket, the thrust width of the carrier tape conveying device can be made smaller.

[0017] According to a fourth aspect of this disclosure, the carrier tape conveying device described in the third aspect is provided, wherein the shaft fixing portion has an elastic member that presses the inner ring toward the frame and a fixing member that is inserted into and fixed in a shaft hole provided in the shaft portion and presses the elastic member toward the inner ring, and the outer ring has an engaging portion that engages with the sprocket in the thrust direction. As a result, even in a thin carrier tape conveying device, the sprocket can be biased toward the thrust bearing with a simple structure, so that rattling in the thrust direction can be suppressed and higher feeding accuracy can be achieved.

[0018] According to a fifth aspect of this disclosure, the carrier tape conveying device described in the fourth aspect is provided, wherein the fixing member is a screw, and a threaded portion with a screw thread is provided inside the shaft hole. As a result, the elastic member can be directly fixed to the shaft portion of the frame by the fixing member, and the width of the carrier tape conveying device in the thrust direction can be reduced.

[0019] According to a sixth aspect of this disclosure, a carrier tape conveying device according to any one of the first to fifth aspects is provided, wherein the sprocket has a gear for transmitting rotational power. Since the gear for transmitting rotational power is integrated with the sprocket that conveys the carrier tape, the thrust width of the carrier tape conveying device can be made smaller.

[0020] According to a seventh aspect of the present disclosure, a carrier tape conveying device according to any one of the first to sixth aspects is provided, wherein the sprocket comprises an annular sprocket wheel having pins and a sprocket base mounted on a radial bearing and biased to a thrust bearing.

[0021] According to an eighth aspect of the present disclosure, the sprocket provides a carrier tape transport device according to any one of the first to seventh aspects, having a gear for transmitting rotational power.

[0022] According to the ninth aspect of this disclosure, a tape feeder is provided that transports a carrier tape having feed holes at a predetermined pitch and supplies components stored on the carrier tape to a component supply position, comprising a carrier tape transport device described in any one of the first to eighth aspects, wherein the carrier tape transport device transports the carrier tape and supplies components to the component supply position. Since a thinned carrier tape transport device is provided, the tape feeder can also be made thinner.

[0023] Hereinafter, exemplary embodiments of component mounting devices relating to this disclosure will be described with reference to the attached drawings. This disclosure is not limited to the specific configurations of the embodiments described below, but includes configurations based on similar technical ideas.

[0024] (Embodiment) The configuration of the component mounting device 1 according to the embodiment of this disclosure will be described with reference to Figure 1. Figure 1 is a schematic diagram of the component mounting device 1. In Figure 1, two mutually orthogonal axial directions in the horizontal plane are shown: the X direction of the substrate transport direction (perpendicular to the plane of the paper in Figure 1) and the Y direction (left-right direction in Figure 1) which is orthogonal to the substrate transport direction. The Z direction (up-down and vertical directions in Figure 1) is shown as the height direction orthogonal to the horizontal plane. The radial direction refers to the radial direction of the rotation axis, and the thrust direction refers to the axial direction of the rotation axis.

[0025] The component mounting device 1 manufactures mounted circuit boards on which components are mounted. A circuit board transport mechanism 2, located on the upper surface of a base 1a, transports, positions, and holds the circuit board 3 in the X direction. Above the circuit board transport mechanism 2 is a mounting head 4, which moves horizontally (X and Y directions) by a head moving mechanism (not shown). On the upper part of a trolley 5 coupled to the base 1a to the side of the circuit board transport mechanism 2, multiple tape feeders 6 are mounted in a row in the X direction. The tape feeders 6 are component supply devices that supply components to the component mounting device 1.

[0026] On the front side of the trolley 5 and below the tape feeder 6, a reel holder 9 is installed that rotatably supports a reel 8 around which a carrier tape 7 containing parts to be supplied to the parts loading device 1 is wound. The tape feeder 6 transports the carrier tape 7 stored on the reel 8 in the tape feeding direction and supplies parts to the parts pick-up position (parts supply position) P1 by the loading head 4.

[0027] The component mounting device 1 includes a mounting control unit 10 that controls a substrate transport mechanism 2, a mounting head 4, and a head movement mechanism. The mounting control unit 10 transmits a component supply command to the unit control unit 17 of the tape feeder 6, and controls the mounting head 4 and the head movement mechanism to perform component mounting work, in which the mounting head 4 retrieves the components supplied by the tape feeder 6 to the component retrieval position, and transfers and mounts them to the mounting point on the substrate 3 held by the substrate transport mechanism 2. In this way, the tape feeder 6 is a tape feeder that supplies components stored on a carrier tape 7 to the component mounting device 1. The components stored on the carrier tape 7 are, for example, chip-type electronic components. Above the base 1a and the trolley 5, there is an openable and closable main body cover 11 that covers the movable mechanisms such as the mounting head 4 during operation to prevent the operator from touching them.

[0028] The mounting control unit 10 includes a storage unit. The mounting control unit 10 is composed of, for example, a processor or FPGA or other circuitry and memory or an SSD or the like.

[0029] In Figure 1, a collection box 12 is installed at the bottom of the trolley 5 to collect the empty carrier tape 7 that is discharged from the rear of the tape feeder 6 after the components have been removed by the mounted head 4. A discharge chute 13 is installed on the rear side of the trolley 5 to guide the empty carrier tape 7 discharged from the tape feeder 6 to the collection box 12. The discharge chute 13 is equipped with a cutting section 14 that cuts the empty carrier tape 7 to a predetermined length. The empty carrier tape 7 discharged from the tape feeder 6 is cut by the cutting section 14 and collected in the collection box 12.

[0030] Tape feeder Next, the configuration of the tape feeder 6 will be described with reference to Figures 2 to 4. Figure 2 is a schematic diagram of the tape feeder 6 according to the embodiment. Figure 3 is a partial plan view of the area around the component removal position P1 of the tape feeder 6. Figure 4 is an explanatory diagram showing a schematic cross-section in the direction of arrow V in Figure 2.

[0031] The tape feeder 6 comprises a tape transport path 20, an exposed section 80, and a carrier tape transport device 21 inside the main body 60. The tape transport path 20 includes an insertion port 20a into which the carrier tape 7 is fed and an outlet port 20b from which the carrier tape 7 is discharged. The main body 60 of the tape feeder 6 is composed of multiple members, including a base 61, a main frame 62, and a sub-frame 63. The base 61 is the part fixed to the trolley 5, and the main frame 62 and sub-frame 63 are fixed parallel to it. The main frame 62 and sub-frame 63 are plate-shaped members with a vertically elongated cross-section when viewed from the Y direction (see Figure 4), and the tape transport path 20 is formed in the space between the main frame 62 and sub-frame 63. The main frame 62 is the frame that constitutes the carrier tape transport device 21 that transports the carrier tape 7 along the tape transport path 20, and multiple first to third sprockets 26, 40, 30 and a motor 25 for driving them are assembled to it.

[0032] The tape transport path 20 guides the carrier tape 7, which has been inserted into the tape transport path 20 from the insertion opening 20a, to the parts removal position P1, and further guides it to the discharge opening 20b. The exposed part 80 peels off the top tape 7b of the carrier tape 7 (see Figure 14) from the carrier tape 7 and packs it onto the carrier tape 7. Ta The component 16 is exposed. In this embodiment, the exposed portion 80 is made by peeling the top tape 7b from the carrier tape 7, but the component 16 may also be exposed by cutting open the top tape 7b with a cutter or the like.

[0033] The insertion port 20a opens on the upstream side (left side in Figure 2) in the tape feeding direction of the tape transport path 20. The discharge port 20b opens on the downstream side (right side in Figure 2) in the tape feeding direction. The tape transport path 20 is connected from the insertion port 20a to the discharge port 20b. The tape transport path 20 has an open section from the second sprocket 40 to the third sprocket 30 that is open upwards. The main body 60 is fitted with a tape cover 90 that covers the upper part of this open section. As shown in Figure 3, the tape cover 90 is positioned to straddle the upper part of the main frame 62 and the upper part of the sub-frame 63, and a component removal port 90a is formed at a position corresponding to the component removal position P1. The upper outer surface of the main frame 62 has a cover mounting portion 62k on which the tape cover 90 is attached. The cover mounting portion 62k is, for example, a recess or a stepped shape.

[0034] Furthermore, an opening 622 is provided in the main frame 62 within this open section to expose the pin 28a of the second sprocket 40 (see Figure 7). The pin 28a exposed through the opening 622 engages with the feed hole 7d of the carrier tape 7, and the carrier tape 7 is positioned as the second sprocket 40 rotates. The second sprocket 40 guides the carrier tape 7 to the lower transport surface of the tape cover 90. 62g The tape travels along the route, and the parts 16 stored in the pockets 7c of the carrier tape 7 are transported to the parts retrieval position P1.

[0035] The mounted head 4 removes the components 16 stored in the carrier tape 7 from the components outlet 90a. The tape cover 90 has relief holes 90b and 90c formed in it to avoid interference with the second sprocket 40 and the third sprocket 30.

[0036] Carrier Tape Next, the carrier tape 7 will be described in detail with reference to Figure 14. Figure 14 is a schematic perspective view of the carrier tape 7.

[0037] The carrier tape 7 has a base tape 7a and a top tape 7b. The base tape 7a has storage compartments 7e formed in a row along its longitudinal direction at equal intervals by embossing. Inside these storage compartments 7e, there are pockets 7c that open upwards, and each pocket 7c stores a component 16. The top tape 7b is attached to the upper surface of the base tape 7a and encloses the components 16 in the pockets 7c. Multiple feed holes 7d are arranged in a row parallel to the row of pockets 7c on the base tape 7a at equal intervals Pt1. The depth Hb of the pockets 7c that store the components 16 is sized according to the dimensions of the components to be stored. The width Wa of the carrier tape 7 is also selected to be an appropriate size according to the dimensions of the components.

[0038] Carrier tape transport device Next, the carrier tape transport device 21 will be described with reference to Figure 5. Figure 5 is a YZ plan view of the carrier tape transport device 21.

[0039] The carrier tape transport device 21 transports the carrier tape 7 to the parts retrieval position P1 on the downstream side of the tape transport path 20. The carrier tape transport device 21 comprises a main frame 62, at least one sprocket, a motor 25, and a plurality of drive gears that transmit power from the motor 25 to the sprockets to rotate them. The carrier tape transport device 21 in this embodiment comprises three sprockets: a first sprocket 26, a second sprocket 40, and a third sprocket 30.

[0040] The first sprocket 26 is mounted on the main frame 62 so as to be rotatable around a horizontal axis of rotation parallel to the X direction. The first sprocket 26 is fixed coaxially to the first gear 27, which functions as a drive gear. The second sprocket 40 is mounted on the main frame 62 so as to be rotatable around a horizontal axis of rotation J (see Figure 6), which is parallel to the X direction. The third sprocket 30 is mounted on the main frame 62 so as to be rotatable around a horizontal axis of rotation parallel to the X direction. The third sprocket 30 is fixed coaxially to the third gear 31, which functions as a drive gear. The carrier tape transport device 21 further includes a plurality of drive gears that transmit the driving force of the motor 25.

[0041] The output gear 25a of the motor 25 engages with the fourth gear 35, and this fourth gear 35 engages with the fifth gear 32. The fifth gear 32 engages with the sixth gear 33. The sixth gear 33 engages with the first gear 27 and the second gear 29.

[0042] The second gear 29 engages with the seventh gear 34, and the seventh gear 34 engages with the third gear 31. Thus, the rotational driving force of the motor 25 is transmitted to the first sprocket 26 via the output gear 25a, the fourth gear 35, the fifth gear 32, the sixth gear 33, and the first gear 27. The rotational driving force of the motor 25 is also transmitted from the sixth gear 33 to the second sprocket 40 via the second gear 29, and further transmitted from the second gear 29 to the third sprocket 30 via the seventh gear 34 and the third gear 31. In this way, the first sprocket 26, the second sprocket 40, and the third sprocket 30 are driven by a single motor 25.

[0043] Next, the main frame 62 of the carrier tape transport device 21 will be described with reference to Figures 4 to 9. Figure 6 is a longitudinal cross-sectional view of the carrier tape transport device 21 in the XZ plane. Figure 7 is a partially enlarged perspective view of the carrier tape transport device 21. Figure 8 is an exploded cross-sectional view of the carrier tape transport device 21. Figure 9 is a partially longitudinal cross-sectional view of the main frame 62.

[0044] As shown in Figures 6 and 9, the main frame 62 has a first surface 62L and a second surface 62R as sides that extend vertically and horizontally (parallel to the YZ plane) along the direction of transport of the carrier tape 7 by the tape transport path 20. The main frame 62 is a plate-like member with a small thickness dimension T sandwiched between the first surface 62L and the second surface 62R. For this reason, the cross-section of the main frame 62 perpendicular to the transport direction of the carrier tape 7 (XZ cross-section) is elongated vertically.

[0045] The main frame 62 has a flat transport surface 62g formed on its upper surface for guiding the carrier tape 7 along the tape transport path 20. The second surface 62R of the main frame 62 has recesses formed therein that serve as spaces for sprockets and drive gears. In this embodiment, the main frame 62 has a first recess 62a, a second recess 62b, and a third recess 62c. In the thrust direction, the second recess 62b is located within the first recess 62a, and the third recess 62c is located within the second recess 62b.

[0046] In the thrust direction, the depth D3 of the third recess 62c from the second surface 62R is greater than the depth D2 of the second recess 62b from the second surface 62R, and the depth D2 of the second recess 62b is greater than the depth D1 of the first recess 62a from the second surface 62R. Also, in the radial direction, the length of the second recess 62b is greater than the length of the third recess 62c, and the length of the first recess 62a is greater than the length of the second recess 62b.

[0047] The first recess 62a is formed for the purpose of housing the first sprocket 26, the second sprocket 40, and the third sprocket 30. The second recess 62b is formed for the purpose of housing the drive gear. The third recess 62c is a recess for mounting the bearing plate 49, which will be described later. In this way, each recess formed in the main frame 62 houses the main components, such as the sprockets and drive gear, within the thickness T of the main frame 62. In particular, the radial bearing 43 and thrust bearing 45 included in the second sprocket 40 are also housed in the respective recesses formed in the main frame 62. As a result, the radial bearing 43 can be positioned so as to overlap with at least a portion of the thrust bearing 45 in the radial direction, which contributes to the thinning of the carrier tape transport device 21.

[0048] The first recess 62a, the second recess 62b, and the third recess 62c are each formed in a stepped manner, extending from the second surface 62R toward the first surface 62L. At the center of the third recess 62c, a shaft portion 62d is formed that protrudes from the first surface 62L toward the second surface 62R. The shaft portion 62d protrudes from the third recess 62c through the center of the second recess 62b into the first recess 62a. The shaft portion 62d has a cylindrical shape and contains a hollow shaft hole 62e and a threaded portion 62f formed within the shaft hole 62e.

[0049] The central axis of the shaft portion 62d is the same as the rotation axis J of the second sprocket 40, and the second sprocket 40 rotates around the shaft portion 62d. The screw 42 of the shaft fixing portion 50, which will be described later, is screwed into the shaft hole 62e. The screw 42 has a flange 42a that extends radially on the top side (see Figure 8). In this way, since the shaft portion 62d is part of the main frame 62, the outer width of the tape feeder 6 in the thrust direction can be made smaller.

[0050] Returning to Figure 5, the transport surface 62g has multiple openings 621, 622, and 623 that communicate with the first recess 62a. At opening 621, the pin 26a of the first sprocket 26 protrudes beyond the transport surface 62g. Further downstream at opening 622, the pin 28a of the second sprocket 40 protrudes beyond the transport surface 62g (see Figure 7). Further downstream at opening 623, the pin 30a of the third sprocket 30 protrudes beyond the transport surface 62g (see Figure 5). These pins 26a, 28a, and 30a are inserted into the feed holes 7d of the carrier tape 7 located on the transport surface 62g. Therefore, when the first to third sprockets 26, 40, and 30 rotate, the carrier tape 7 is fed out to the pins 26a, 28a, and 30a and moves along the transport surface 62g. Below the first to third sprockets 26, 40, and 30, foreign matter receiving sections 59 are positioned to guide foreign matter that has become lodged between the pins of each sprocket to foreign matter discharge holes 62h and foreign matter discharge ports 62m.

[0051] Next, the carrier tape transport device 21 will be described in detail with reference to Figures 6, 8, and 10. The carrier tape transport device 21 further includes a radial bearing 43, a thrust bearing 45, and a shaft fixing part 50.

[0052] The radial bearing 43 reduces radial friction between the second sprocket 40 and the shaft portion 62d. The radial bearing 43 is positioned between the shaft portion 62d of the main frame 62 and the sprocket base 19 of the second sprocket 40. The radial bearing 43 has an inner ring 43a, rolling elements 43b, an outer ring 43c, and a flange 43d (see Figure 11).

[0053] As shown in Figure 13, the inner surface of the inner ring 43a is in contact with the outer surface of the shaft portion 62d, and the outer surface of the outer ring 43c is in contact with the mounting hole 19a of the sprocket base 19. The outer ring 43c rotates together with the second sprocket 40, and the rolling elements 43b reduce friction between the outer ring 43c and the inner ring 43a fixed to the shaft portion 62d.

[0054] The flange 43d protrudes radially outward from the thrust-direction inner portion of the outer ring 43c of the radial bearing 43. The flange 43d engages with the inner flange 19b of the sprocket base 19.

[0055] As shown in Figure 10, the second sprocket 40 has a sprocket wheel 28 and a sprocket base 19. The sprocket base 19 has a mounting hole 19a, an inner flange 19b, an annular groove 19c, a screw hole 19d, an outer flange 19e, and a second gear 29. The inner flange 19b is formed on the radially inward side of the sprocket base 19. The inner flange 19b has a flange surface 19ba and a bottom surface 19bb opposite the flange surface 19ba.

[0056] The mounting hole 19a aligns with the central axis of the sprocket wheel 28's central hole 28b. The outer ring 43c of the radial bearing 43 is mounted in the mounting hole 19a.

[0057] The annular groove 19c of the sprocket base 19 extends inward in the thrust direction from the inner flange 19b, then outward in the radial direction, and further outward in the thrust direction. Thus, the annular groove 19c opens outward in the thrust direction and is annularly recessed.

[0058] A thrust bearing 45 is positioned inside an annular groove 19c of the sprocket base 19. The thrust bearing 45 reduces thrust friction between the second sprocket 40 and the main frame 62. The thrust bearing 45 has an annular retainer 45a and a bearing 45b rotatably held within the retainer 45a (see Figure 12).

[0059] Returning to Figure 10, a screw hole 19d is formed in the outer flange 19e. A second gear 29 is formed on the radially outward side of the outer flange 19e. Therefore, the screw hole 19d is formed between the annular groove 19c and the second gear 29.

[0060] The sprocket wheel 28 has a pin 28a, a center hole 28b, and a through hole 28c. The pin 28a is connected to the feed hole 7 of the carrier tape 7. d While engaged, the carrier tape 7 is transported in the rotational direction of the second sprocket 40. A central hole 28b is formed in the center of the sprocket wheel 28, and the outer part of the sprocket base 19 and the outer flange 19e surrounding the annular groove 19c are fitted into the central hole 28b.

[0061] The sprocket wheel 28 is fixed to the sprocket base 19 between the annular groove 19c of the sprocket base 19 and the second gear 29. The sprocket base 19 and the sprocket wheel 28 are fixed together by aligning the through hole 28c formed in the sprocket wheel 28 with the screw hole 19d of the sprocket base 19 and fastening it with a screw 47. As a result, the second gear 29 and the sprocket wheel 28 can rotate together as a single unit.

[0062] As shown in Figures 6, 8, and 13, the carrier tape transport device 21 further comprises an annular bearing plate 49. The bearing plate 49 is positioned between the thrust bearing 45 and the main frame 62. The bearing plate 49 is a member that supports the outward thrust load from the bearing 45b. The bearing plate 49 is, for example, a sheet of metal. If the strength of the main frame 62 is sufficient to withstand this load, the main frame 62 may be used as the bearing plate 49.

[0063] As shown in Figures 8 and 13, an elastic member 51 is positioned between the flange 42a of the screw 42 of the shaft fixing part 50 and the radial bearing 43. The elastic member 51 is, for example, a disc spring. When the screw 42 is tightened into the shaft hole 62e, the elastic member 51 presses against the inner ring 43a of the radial bearing 43. Towards Frame 62 Pressing. This causes the flange 43d of the radial bearing 43 to press against the inner flange 19b of the second gear 29, so that the sprocket base 19 presses against the bearing 45b of the thrust bearing 45. Towards Frame 62 Press down. This will cause the second sprocket 40 thrust Directional instability can be reduced.

[0064] Next, with reference to Figure 15, the retrieval of foreign matter 93 that has fallen between the pins 28a will be described. Figure 15 is a partially enlarged longitudinal cross-sectional view of the tape feeder 6 in the YZ plane. The foreign matter 93 is, for example, dust or parts 16 that have been scattered from the carrier tape 7 during the replacement of the tape feeder 6.

[0065] Inside the main frame 62, the second sprocket 40 has its pin 28a tips surrounded by a foreign object receiving portion 59. The foreign object receiving portion 59 is located between the main frame 62 and the inner cover 38. Below the second sprocket 40, a first foreign object guide portion 59b is provided to guide foreign objects 93 that enter the main frame 62 as the second sprocket 40 rotates into a pocket 59a. The first foreign object guide portion 59b is part of the upper surface of the foreign object receiving portion 59 and is formed along a circle connecting the tips of each pin 28a of the second sprocket 40.

[0066] Pocket 59a is a recessed area that extends downward from the first foreign object guide portion 59b and is connected to a foreign object discharge hole 62h formed in the main frame 62 that communicates with the outside. Foreign objects 93 that fall between the pins 28a rotate with the second sprocket 40 and are collected in pocket 59a. An operator can retrieve the foreign objects 93 collected in pocket 59a through the foreign object discharge hole 62h.

[0067] Below the third sprocket 30, a second foreign object guide section 59c is formed by a foreign object receiving section 59. The second foreign object guide section 59c guides foreign objects 93 that fall into the main frame 62 as the third sprocket 30 rotates to the foreign object discharge port 62m. The second foreign object guide section 59c is part of the upper surface of the foreign object receiving section 59 and is inclined downward. Foreign objects 93 that fall from the third sprocket 30 into the second foreign object guide section 59c move along the second foreign object guide section 59c by their own weight and are discharged to the outside of the main frame 62 through the foreign object discharge port 62m.

[0068] Next, the sharing of the carrier tape transport device 21 will be explained with reference to Figure 16. Figure 16 is an explanatory diagram showing a cross-section of another type of tape feeder 6A. Tape feeder 6A is a dedicated tape feeder for transporting carrier tapes 7A with a long pocket depth Hb. The depth Hb of the pocket 7Aa is the transport surface 62g The distance from the second sprocket 40 to the axis of rotation J is longer than Rs.

[0069] Because the width of the carrier tape transport device 21 in the thrust direction is small, the carrier tape transport device 21 can be used even in a tape feeder 6A that transports a carrier tape 7A with a long pocket depth Hb, thus promoting the sharing of parts even in different types of tape feeders.

[0070] Furthermore, as shown in Figure 17, if the depth of the pocket 7Ba of the carrier tape 7B is long and the weight of the parts contained in the pocket 7Ba is heavy, the tape feeder 6B is equipped with two carrier tape transport devices 21, and the carrier tape 7B is transported by the two carrier tape transport devices 21. In such a tape feeder 6B, two second sprockets 40 are arranged symmetrically on the main frame 62 and the sub-frame 63, respectively. Power from the motor 25 is transmitted to the second sprockets 40 located on the sub-frame 63 via the power transmission shaft 70. In this way, the carrier tape transport device 21 can be used even in a dedicated tape feeder for transporting carrier tapes 7B containing heavy parts, and the sharing of parts can be promoted even in different types of tape feeders.

[0071] The carrier tape transport device 21 of this embodiment transports a carrier tape 7 that houses components 16 and has feed holes 7d at a predetermined pitch. The carrier tape transport device 21 comprises a main frame 62, a second sprocket 40, a radial bearing 43, a thrust bearing 45, and a shaft fixing part 50. The main frame 62 has a transport surface 62g that supports and guides the transported carrier tape 7 from below, and has a vertically elongated cross-section perpendicular to the transport direction of the carrier tape 7, and has a pair of first surfaces 62L and second surfaces 62R that extend vertically and horizontally along the transport direction. The second sprocket 40 has a plurality of radially protruding pins 28a and a mounting hole 19a opening in the center, and rotates while engaging with the feed holes 7d of the carrier tape 7 to transport the carrier tape 7. The radial bearing 43 has an outer ring 43c and an inner ring 43a. The outer ring 43c is mounted in the mounting hole 19a to support the second sprocket 40 so that it can rotate around a rotation axis J perpendicular to the conveying direction of the carrier tape 7 relative to the main frame 62. The thrust bearing 45 is sandwiched between the second sprocket 40 and the main frame 62, and the shaft fixing portion 50 biases the second sprocket 40 toward the thrust bearing 45 by pressing the radial bearing 43 toward the main frame 62. The radial bearing 43 is positioned so as to overlap at least a portion of the thrust bearing 45 in the radial direction.

[0072] A radial bearing 43 reduces friction in the radial direction, and a thrust bearing 45 reduces friction in the thrust direction; different bearings are arranged for each direction of friction. This enables high feeding accuracy of the carrier tape 7 and reduces torque loss. Furthermore, the outer ring 43c of the radial bearing 43 is mounted in the mounting hole 19a of the second sprocket 40, and the radial bearing 43 is positioned to overlap with at least a portion of the thrust bearing 45 in the radial direction. This allows the width of the carrier tape conveying device 21 in the thrust direction to be reduced, making it thinner. In addition, the thinner carrier tape conveying device 21 can convey carrier tapes 7 with deep pockets 7c, so it can be used as a tape feeder for both large and small parts.

[0073] Furthermore, in the carrier tape transport device 21 of this embodiment, the radial bearing 43 and the thrust bearing 45 are positioned to overlap in the radial direction. This makes it possible to reduce the width of the main frame 62 that houses the radial bearing 43 and the thrust bearing 45, and as a result, the tape feeder 6 can be made smaller.

[0074] Furthermore, in the carrier tape transport device 21 of this embodiment, the second sprocket 40 has an annular groove 19c into which a thrust bearing 45 fits, located radially outward from the radial bearing 43 on the first surface 19L facing the main frame 62.

[0075] Furthermore, in the carrier tape transport device 21 of this embodiment, the main frame 62 has a first recess 62a and a second recess 62b formed on one side surface, the second surface 62R, and a shaft portion 62d that protrudes at a position surrounded by the first recess 62a and the second recess 62b and is inserted into the inner ring 43a of the radial bearing 43. The second sprocket 40 mounted on the radial bearing 43 is housed in the first recess 62a and the second recess 62b. 。

[0076] Furthermore, in the carrier tape transport device 21 of this embodiment, the shaft fixing portion 50 includes an elastic member 51 that presses the inner ring 43a of the radial bearing 43 toward the main frame 62, and a screw 42 that is inserted into and fixed in a shaft hole 62e provided in the shaft portion 62d, and also presses the elastic member 51 against the inner ring 43a. The outer ring of the radial bearing 43 is provided with a flange 43d that engages with the second sprocket 40 in the thrust direction.

[0077] Furthermore, in the carrier tape transport device 21 of this embodiment, the second sprocket 40 has a second gear 29 that transmits rotational power. Since the gear that transmits rotational power and the sprocket that transports the carrier tape 7 are integrated, the carrier tape transport device 21 can be made smaller.

[0078] Furthermore, in the carrier tape transport device 21 of this embodiment, the second sprocket 40 consists of an annular sprocket wheel 28 having a pin 28a and a sprocket base 19 that is mounted on a radial bearing 43 and biased by a thrust bearing 45.

[0079] Furthermore, in the carrier tape transport device 21 of this embodiment, the sprocket base 19 has a second gear 29 that transmits rotational power. Thus, the sprocket base 19 and the second gear 29 are integrated into one unit.

[0080] Furthermore, the tape feeder 6 of this embodiment transports a carrier tape 7 having feed holes 7d at a predetermined pitch Pt1 and supplies the components 16 stored on the carrier tape 7 to the component supply position P1. The tape feeder 6 is equipped with the carrier tape transport device 21 described above, and the carrier tape transport device 21 transports the carrier tape 7 and supplies the components 16 to the component supply position P1.

[0081] The tape feeder 6, by being equipped with a carrier tape transport device 21, can similarly achieve high feeding accuracy even with a thin profile.

[0082] While this disclosure is adequately described in relation to preferred embodiments with reference to the accompanying drawings, various variations and modifications will be obvious to those skilled in the art. Such variations and modifications should be understood as being included within the scope of this disclosure as defined by the attached claims. Furthermore, variations in combinations and sequences of elements in each embodiment can be realized without departing from the scope and spirit of this disclosure.

[0083] In the above embodiment, the second sprocket 40 was described as having a configuration in which the radial bearing 43 overlaps with at least a portion of the thrust bearing 45 in the radial direction, but the embodiment is not limited to this. In the first sprocket 26 as well, the radial bearing 43 may also overlap with at least a portion of the thrust bearing 45 in the radial direction.

[0084] Furthermore, by appropriately combining any embodiment or modification from the various embodiments and modifications described above, the effects of each can be achieved. [Industrial applicability]

[0085] The carrier tape transport device according to this disclosure is applicable to a carrier tape transport device that transports a carrier tape containing components toward a component supply position, and a tape feeder equipped therewith. [Explanation of Symbols]

[0086] 1. Component mounting device 1a Base 2. Substrate transport mechanism 3 circuit boards 4. Mounted Head 5 carts 6 Tape feeders 7, 7A Carrier Tape 7a Base Tape 7b Top Tape 7c, 7Aa pocket 7d feed hole 7e storage compartment 8 reels 9 Reel holding section 10 Mounted control unit 11 Main unit cover 12 collection boxes 13 Discharge Chute 14 Cut section 15. Reader device 16 parts 17 unit control unit 19 sprocket base 19a Mounting hole 19b Inner flange 19ba flange surface 19bb bottom 19th century ring groove 19d screw hole 19e Outer flange 19L 1st page 19R 2nd page 20 Tape transport path 20a Insertion port 20b Outlet 21 Carrier tape transport device 25 Motor 26. First sprocket 26a pin 27 First Gear 28 Sprocket Wheel 28a pin 28b center hole 28c through hole 28e seat Department 29 Second Gear 30 Third sprocket 30a pin 31 Third Gear 35 Fourth Gear 32 Fifth Gear 33. Sixth Gear 34. 7th Gear 38 Inner cover 40 2nd sprocket 42 screws 42a Flange 43 Radial bearings 43a Inner ring 43b Rolling element 43c outer ring 43d flange 45 Thrust bearing 45a Retainer 45b bearing 47 Screw, Shaft fixing screw 49 Bearing plate 50 Axis fixing part 51 Elastic part Material 59 Foreign object receiving section 59a Pocket 59b First foreign object guide section 59c Second foreign object guide section 60 Main body 61 Base 62 Main Frame 62a First recess 62b Second recess 62c Third recess 62d Shaft 62e shaft hole 62f Screw part 62g Conveyor surface 62h Foreign matter discharge hole 62k cover mounting area 62m Foreign matter outlet 62L 1st page 62R Page 2 63 Subframe 70 Power transmission shaft 80 Exposed part 90 Tape Covers 90a Parts outlet 90b, 90c Escape Hole 93 Foreign matter 621, 622, 623 aperture D1, D2, D3 depth Hb depth J rotation axis P1 Parts removal location Rs distance

Claims

1. A carrier tape transport device that stores components and transports a carrier tape having feed holes at a predetermined pitch, A frame having a transport surface that supports and guides the transported carrier tape from below, a cross-section perpendicular to the transport direction of the carrier tape being elongated vertically, and a pair of sides extending vertically and horizontally along the transport direction, A sprocket having multiple pins protruding radially and a mounting hole opening in the center, which rotates while engaging with the feed hole of the carrier tape to transport the carrier tape, A radial bearing having an outer ring and an inner ring, wherein the outer ring is attached to the mounting hole and the sprocket is supported relative to the frame so as to be rotatable around a rotation axis perpendicular to the conveying direction of the carrier tape, The thrust bearing sandwiched between the sprocket and the frame, The shaft fixing portion includes a part that presses the inner ring of the radial bearing toward the frame, thereby pressing the outer ring of the radial bearing against the thrust bearing, The radial bearing is positioned so as to overlap with at least a portion of the thrust bearing in the radial direction. Carrier tape transport device.

2. The sprocket has an annular groove into which the thrust bearing fits radially outward from the mounting hole. The carrier tape transport device according to claim 1.

3. The frame has a recess formed on one side and a shaft portion that protrudes at a position surrounded by the recess and is inserted into the inner ring, and the sprocket mounted on the radial bearing is housed in the recess. The carrier tape transport device according to claim 2.

4. The shaft fixing portion includes an elastic member that presses the inner ring toward the frame, and a fixing member that is inserted into and fixed in a shaft hole provided in the shaft portion and presses the elastic member against the inner ring. The outer ring has an engagement portion that engages with the sprocket in the thrust direction. The carrier tape transport device according to claim 3.

5. The aforementioned fixing member is a screw, A threaded portion with screw threads is provided inside the aforementioned shaft hole. The carrier tape transport device according to claim 4.

6. The sprocket has a gear that transmits rotational power. A carrier tape transport device according to any one of claims 1 to 5.

7. The aforementioned sprocket is An annular sprocket wheel having the aforementioned pin, It consists of a sprocket base that is mounted on the radial bearing and biased by the thrust bearing, A carrier tape transport device according to any one of claims 1 to 5.

8. The sprocket base has a gear that transmits rotational power. The carrier tape transport device according to claim 7.

9. A tape feeder that transports a carrier tape having feed holes at a predetermined pitch and supplies components stored on the carrier tape to a component supply position, A carrier tape transport device according to any one of claims 1 to 5, The carrier tape transport device transports the carrier tape and supplies the parts to the parts supply position. Tape feeder.

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