Feeder

Abstract

This feeder comprises: a first sprocket engageable with a first feed hole which is a feed hole formed on one end side in the width direction of a carrier tape in which a component is stored; and a second sprocket engageable with a second feed hole which is a feed hole formed on the other end side in the width direction of the carrier tape. The carrier tape is conveyed by both the first sprocket and the second sprocket to supply the component at a supply position. The second sprocket has a phase difference corresponding to rotation by a predetermined angle with respect to the first sprocket.

Description

feeder

[0001] This specification discloses a technique related to a feeder.

[0002] The carrier tape feeding mechanism described in Patent Document 1 includes a sprocket, a shaft member, a motor, and a transmission gear mechanism. The sprockets include a left sprocket and a right sprocket, and are disposed with their rotation axes extending in the left-right direction. In the tape feeder described in Patent Document 1, the motor rotates the shaft member, and the rotational force is transmitted to the sprockets via the left and right transmission gear mechanisms, causing the left and right sprockets to rotate synchronously in the same direction.

[0003] Japanese Patent Application Laid-Open No. 2020-161664

[0004] When transporting a carrier tape using a pair of sprockets provided at both ends of the carrier tape in the width direction, the feeding accuracy of the carrier tape may be reduced, for example, due to a gap between the feed holes in the carrier tape and the teeth of the sprocket.

[0005] In view of the above circumstances, this specification discloses a feeder that can suppress a decrease in the feeding accuracy of the carrier tape.

[0006] This specification discloses a feeder comprising a first sprocket engageable with a first feed hole, which is a feed hole formed at one end side in the width direction of a carrier tape in which components are stored, and a second sprocket engageable with a second feed hole, which is a feed hole formed at the other end side in the width direction of the carrier tape, the feeder transporting the carrier tape by both the first sprocket and the second sprocket to supply the components at a supply position, wherein the second sprocket has a phase difference rotated by a predetermined angle relative to the first sprocket.

[0007] This specification discloses the technical idea of ​​changing "the feeder according to claim 1" to "the feeder according to any one of claims 1 to 5" in claim 6 of the claims originally attached to the application (hereinafter referred to as the "original claims"). This specification also discloses the technical idea of ​​changing "the feeder according to claim 1" to "the feeder according to any one of claims 1 to 6" in claim 7 of the original claims. This specification also discloses the technical idea of ​​changing "the feeder according to claim 1" to "the feeder according to any one of claims 1 to 7" in claim 8 of the original claims.

[0008] According to the feeder described above, by providing a phase difference between the first sprocket and the second sprocket, it is possible to suppress a decrease in the feeding accuracy of the carrier tape.

[0009] FIG. 1 is a plan view showing an example of the configuration of a component mounting machine. FIG. 2 is a front view showing an example of a feeder with a drive unit seen through. FIG. 3 is a perspective view of a feeder with an enlarged view of the vicinity of the drive unit seen through. FIG. 4 is a perspective view showing a part of the drive unit. FIG. 5 is a plan view showing an example of a carrier tape. FIG. 6 is a plan view showing an example of the positional relationship between feed holes and sprocket teeth when no phase difference is provided between the first sprocket and the second sprocket. FIG. 7 is a distribution diagram showing an example of the distribution of carrier tape feed positions. FIG. 8 is a plan view showing an example of the positional relationship between feed holes and sprocket teeth when a phase difference is provided between the first sprocket and the second sprocket.

[0010] 1. Embodiment 1-1. Configuration Example of Component Mounting Machine 10 A feeder 40 loaded with carrier tape 80 can be used in a component mounting machine 10. The component mounting machine 10 mounts components 91 on a board 90. As shown in FIG. 1 , the component mounting machine 10 includes a board transport device 11, a component supply device 12, a component transfer device 13, a component camera 14, a board camera 15, and a control device 16.

[0011] The board transport device 11 is configured, for example, by a belt conveyor or the like, and transports the board 90 in a transport direction (X-axis direction). The board 90 is a circuit board on which various circuits such as electronic circuits, electric circuits, and magnetic circuits are formed. The board transport device 11 transports the board 90 into the component mounting machine 10 and positions the board 90 at a predetermined position within the machine. After the component mounting machine 10 has completed the mounting process of the multiple components 91, the board transport device 11 transports the board 90 out of the component mounting machine 10.

[0012] The component supply device 12 supplies components 91 to be mounted on the board 90. The component supply device 12 may include a plurality of feeders 40 shown in FIG. 2 arranged along the conveyance direction (X-axis direction) of the board 90. Each of the plurality of feeders 40 is equipped with a reel. A carrier tape 80 containing components 91 is wound around the reel. The feeder 40 feeds the carrier tape 80 at a pitch to supply the components 91 so that they can be picked up at a supply position PP1 located at the tip end of the feeder 40. The component supply device 12 can also supply electronic components (e.g., lead components) that are relatively large compared to chip components and the like, arranged on trays.

[0013] The component transfer device 13 includes a head driver 13a and a movable table 13b. The head driver 13a is configured to move the movable table 13b in the X-axis direction and the Y-axis direction (a direction perpendicular to the X-axis direction in a horizontal plane) using a linear motion mechanism. A mounting head 20 is detachably (replaceably) attached to the movable table 13b using a clamping member. The mounting head 20 uses at least one holding member 30 to pick up and hold a component 91 supplied from the component supply device 12 and mount the component 91 on a board 90 positioned by the board transport device 11. The holding member 30 may be, for example, a suction nozzle or a chuck.

[0014] Known imaging devices can be used for the component camera 14 and the board camera 15. The component camera 14 is fixed to a base of the component mounting machine 10 so that its optical axis faces upward in the vertical direction (the Z-axis direction, which is perpendicular to the X-axis and Y-axis directions). The component camera 14 can capture images of components 91 held by the holding member 30 from below. The board camera 15 is mounted on the movable table 13b of the component transfer device 13 so that its optical axis faces downward in the vertical direction (the Z-axis direction). The board camera 15 can capture images of the board 90 transported by the board transport device 11, the components 91 supplied by the component supply device 12, and the like from above.

[0015] The component camera 14 and the board camera 15 capture images based on control signals sent from the control device 16. Image data of the images captured by the component camera 14 and the board camera 15 is sent to the control device 16. The control device 16 includes a known arithmetic unit and storage device, and forms a control circuit. Information and image data output from various sensors provided in the component mounting machine 10 are input to the control device 16. The control device 16 sends control signals to each device based on a control program, predetermined mounting conditions, etc.

[0016] For example, the control device 16 causes the board camera 15 to capture an image of the board 90 positioned by the board transport device 11. The control device 16 processes the image captured by the board camera 15 to recognize the positioning state of the board 90. The control device 16 also causes the holding member 30 to pick up and hold the component 91 supplied from the component supply device 12, and causes the component camera 14 to capture an image of the component 91 held by the holding member 30. The control device 16 processes the image captured by the component camera 14 to recognize the holding posture of the component 91.

[0017] The control device 16 moves the holding member 30 above the intended placement position that is set in advance by a control program or the like. The control device 16 also corrects the intended placement position based on the positioning state of the board 90, the holding posture of the component 91, and the like, and sets the placement position where the component 91 will actually be placed. The intended placement position and the placement position include a rotation angle in addition to the position (X-axis coordinate and Y-axis coordinate).

[0018] The control device 16 corrects the target position (X-axis coordinate and Y-axis coordinate) and rotation angle of the holding member 30 to match the placement position. The control device 16 lowers the holding member 30 at the corrected rotation angle in the corrected target position to place the component 91 on the board 90. The control device 16 repeats the above pick-and-place cycle to perform the placement process of placing multiple components 91 on the board 90.

[0019] 1-2. Configuration Examples of Feeder 40 and Carrier Tape 80 Feeder 40 supplies components 91 so that they can be picked up at supply position PP1. Feeder 40 can take various forms as long as it can supply components 91 at supply position PP1. As shown in Figures 2 to 4, feeder 40 in this embodiment includes a feeder main body 41 and a drive device 50.

[0020] The feeder main body 41 is formed in a flat box shape and has a supply position PP1 for supplying components 91 to the component mounting machine 10. The supply position PP1 is formed at the top of the leading end side (left side of the paper in FIG. 2 ) of the feeder main body 41. The feeder main body 41 can also detachably (replaceably) hold a reel around which the carrier tape 80 is wound. The reel is rotatably supported by the feeder main body 41.

[0021] 5, the carrier tape 80 includes cavities 81, first feed holes 82a, second feed holes 82b, and a cover tape 83. The cavities 81 are formed so as to be able to store components 91, and are formed at predetermined intervals along the transport direction (direction of arrow TC), which is the longitudinal direction of the carrier tape 80. The intervals between the cavities 81 are set appropriately depending on the dimensions of the components 91 to be stored, etc.

[0022] The first feed holes 82a are feed holes formed at one end of the carrier tape 80 in the width direction (arrow TW direction), and are formed at a predetermined interval along the feed direction (arrow TC direction) of the carrier tape 80. Similarly, the second feed holes 82b are feed holes formed at the other end of the carrier tape 80 in the width direction (arrow TW direction), and are formed at a predetermined interval along the feed direction (arrow TC direction) of the carrier tape 80. The interval between the first feed holes 82a and the interval between the second feed holes 82b are the same.

[0023] A cover tape 83 is adhered to the upper surface of the carrier tape 80, closing the openings of the cavities 81. The cover tape 83 is peeled off from the portion of the carrier tape 80 that has been transported to the supply position PP1 so that the component mounting machine 10 can pick up the components 91. In other words, the feeder 40 peels off the cover tape 83 while transporting the carrier tape 80, and sequentially positions the cavities 81 at the supply position PP1. This allows the components 91 stored in the positioned cavities 81 to be picked up by the component mounting machine 10.

[0024] 2 to 4, the drive device 50 includes a first sprocket 51, a second sprocket 52, a motor 53, a reduction gear 54, an intermediate gear 55, and a reduction gear 56. The first sprocket 51 is engageable with a first feed hole 82a of the carrier tape 80, and the second sprocket 52 is engageable with a second feed hole 82b of the carrier tape 80. The feeder 40 transports the carrier tape 80 using both the first sprocket 51 and the second sprocket 52, and supplies components 91 at a supply position PP1.

[0025] Specifically, the first sprocket 51 and the second sprocket 52 are rotatably supported by the feeder body 41. The first sprocket 51 includes a first tooth portion 51a, a sprocket gear 51b, and a fixed portion 51c. The first tooth portion 51a is formed along the circumferential direction on the outer periphery of the first sprocket 51 at the same intervals as the intervals between first feed holes 82a formed in the carrier tape 80. The first tooth portion 51a sequentially engages with the first feed holes 82a to feed the carrier tape 80 pitch by pitch.

[0026] Similarly, the second sprocket 52 has second tooth portions 52a. The second tooth portions 52a are formed along the circumferential direction on the outer periphery of the second sprocket 52 at the same intervals as the intervals between second feed holes 82b formed in the carrier tape 80. The first sprocket 51 is connected to the sprocket gear 51b by a fixed portion 51c, and the second sprocket 52 is connected to the sprocket gear 51b and the first sprocket 51 by a shaft 50s. Therefore, the second sprocket 52 rotates as the first sprocket 51 is driven. As a result, the second tooth portions 52a sequentially engage with the second feed holes 82b, feeding the carrier tape 80 pitch by pitch.

[0027] The motor 53 rotates the first sprocket 51. The motor 53 may take various forms as long as it can rotate the first sprocket 51, feed the carrier tape 80 using both the first sprocket 51 and the second sprocket 52, and position the components 91 stored in the cavities 81 at the supply position PP1. For example, the motor 53 may be a known stepping motor, servo motor, or the like.

[0028] The motor 53 includes a drive gear 53a. When the rotary shaft of the motor 53 rotates, a reduction gear 54 that meshes with the drive gear 53a provided on the rotary shaft rotates. The driving force of the motor 53 is transmitted to the first sprocket 51 via an intermediate gear 55 that meshes with the reduction gear 54. The intermediate gear 55 meshes with a sprocket gear 51b provided on the first sprocket 51, and the first sprocket 51 rotates in conjunction with the rotation of the intermediate gear 55.

[0029] The drive gear 53a is also meshed with the reduction gear 56. Therefore, the driving force of the motor 53 can be transmitted to another mechanism via the reduction gear 56. For example, the driving force of the motor 53 can be transmitted to a winding mechanism that winds up the cover tape 83 peeled off from the carrier tape 80.

[0030] 1-3. Phase Difference Between the First Sprocket 51 and the Second Sprocket 52 Figure 6 shows an example of the positional relationship between the sprocket teeth and the feed holes when there is no phase difference between the first sprocket 51 and the second sprocket 52. This figure is a plan view, viewed vertically from above, of a pair of first and second feed holes 82a and 82b positioned in the width direction (direction of arrow TW) of the carrier tape 80. The first tooth 51a of the first sprocket 51 engages with the first feed hole 82a, and the second tooth 52a of the second sprocket 52 engages with the second feed hole 82b.

[0031] For example, in the figure, the first feed hole 82a is a round hole and the second feed hole 82b is an elongated hole. Therefore, as shown in the figure, a gap GP0 is more likely to occur between the second feed hole 82b and the second tooth portion 52a of the second sprocket 52 than between the first feed hole 82a and the first tooth portion 51a of the first sprocket 51. If a gap GP0 occurs, there is a possibility that the feeding accuracy of the carrier tape will decrease.

[0032] 7 shows an example distribution of the feed position of the carrier tape 80. The horizontal axis of the figure indicates the amount of misalignment in the width direction (direction of arrow TW) of the carrier tape 80, and the vertical axis indicates the amount of misalignment in the transport direction (direction of arrow TC) of the carrier tape 80. Area AR0 shows an example of the allowable range of misalignment, and area AR1 shows an example of the target range of misalignment. Area AR2 shows an example distribution of the feed position of the carrier tape 80 when the feed position of the carrier tape 80 is measured while the carrier tape 80 is fed by a pitch in the configuration shown in FIG.

[0033] Specifically, as shown in FIGS. 5 and 6 , marks MK0 are provided at predetermined positions on the carrier tape 80 (e.g., at positions located on the forward (arrow TC1) side of the second feed hole 82b in the feed direction (arrow TC) of the carrier tape 80) at intervals of the pitch feed. For example, the control device 16 of the component mounting machine 10 sequentially captures images of the marks MK0 using the board camera 15 while pitch-feeding the carrier tape 80. The control device 16 then processes the images captured by the board camera 15 to measure the position of each mark MK0. The area AR2 can be obtained by plotting the amount of positional deviation of the measured position of the mark MK0 relative to the target feed position. As shown in FIG. 7 , the area AR2 may not fit within the area AR0. FIG. 7 illustrates the possibility that the above-described gap GP0 may reduce the carrier tape feed accuracy.

[0034] 6, the first tooth portion 51a of the first sprocket 51 and the second tooth portion 52a of the second sprocket 52, which feeds the carrier tape 80 together with the first tooth portion 51a, are positioned along the width direction (direction of the arrow TW) of the carrier tape 80 (see the dashed straight line). In other words, the rotation angles of the first sprocket 51 and the second sprocket 52 are the same, and there is no phase difference between the first sprocket 51 and the second sprocket 52. Therefore, in the configuration shown in FIG. 6, it is difficult to reduce the gap GP0.

[0035] In the feeder 40 of this embodiment, the second sprocket 52 is rotated a predetermined angle relative to the first sprocket 51. By providing a phase difference between the first sprocket 51 and the second sprocket 52, the gap GP0 can be easily reduced, thereby preventing a decrease in the feeding accuracy of the carrier tape 80. Specifically, in the above example, the first feed holes 82a are round holes, and the second feed holes 82b are elongated holes. In this way, the second feed holes 82b are designed to have a larger margin of error when the second sprocket 52 engages with them than when the first sprocket 51 engages with the first feed holes 82a.

[0036] In this case, by applying a pressing force to the carrier tape 80 in the feed direction (arrow TC direction) by the second teeth 52a of the second sprocket 52, it becomes easier to reduce the gap GP0 between the second feed holes 82b and the second teeth 52a of the second sprocket 52 shown in FIG. 6 . Furthermore, if the phase difference becomes too large, the second sprocket 52 will not be able to engage with the second feed holes 82b. Therefore, it is preferable that the phase difference be an angle within a range that allows the second sprocket 52 to engage with the second feed holes 82b while applying a pressing force to the carrier tape 80 in the feed direction (arrow TC direction), thereby preventing a decrease in the feeding accuracy of the carrier tape 80 due to the tolerance of the second feed holes 82b.

[0037] Figure 8 shows an example of the positional relationship between the sprocket teeth and the feed holes when a phase difference is provided between the first sprocket 51 and the second sprocket 52. This figure is similar to Figure 6, but shows only a portion of the carrier tape 80 to make it easier to understand the rotation of the carrier tape 80. In the configuration shown in Figure 8, the second tooth portion 52a of the second sprocket 52 is misaligned in the feed direction of the carrier tape 80 (the direction of the arrow TC) with respect to the first tooth portion 51a of the first sprocket 51, which feeds the carrier tape 80 together with the second tooth portion 52a (see the two dashed lines and the arrow).

[0038] In other words, the second sprocket 52 rotates relative to the first sprocket 51, with a phase difference. In the configuration shown in Fig. 8 , the second sprocket 52 is misaligned in the advancing direction (arrow TC1 direction) of the feed direction (arrow TC direction) of the carrier tape 80. This causes the second toothed portions 52a of the second sprocket 52 to apply a pressing force acting on the carrier tape 80 in the advancing direction (arrow TC1 direction) of the feed direction (arrow TC direction), thereby reducing the gap GP0 between the second feed holes 82b and the second toothed portions 52a of the second sprocket 52 shown in Fig. 6 .

[0039] The shapes of the first and second feed holes 82a and 82b are not limited as long as the second feed holes 82b are designed to have a larger tolerance when the second sprocket 52 engages with the first sprocket 51 than when the first sprocket 51 engages with the first feed holes 82a. In the embodiment, the first feed holes 82a are circular holes, and the second feed holes 82b are elongated holes. Similarly, the elongated holes may have various shapes. For example, the elongated holes may be formed in a track shape having a linear portion extending in a direction along the width direction of the carrier tape 80 (the direction of the arrow TW) and arc-shaped portions provided at both ends of the linear portion.

[0040] In this embodiment, the oblong holes are formed in an elliptical shape with their major axes set in the width direction (direction of arrow TW) of the carrier tape 80. These oblong holes have the aforementioned tolerance in the direction of the width direction (direction of arrow TW) of the carrier tape 80. Therefore, in the configuration shown in Figure 6 where there is no phase difference between the first sprocket 51 and the second sprocket 52, the amount of misalignment in the width direction (direction of arrow TW) of the carrier tape 80 is likely to increase, as shown in area AR2 in Figure 7.

[0041] 8 , the phase difference is preferably an angle that allows the second sprocket 52 to engage with the outer end 82b1 of the second feed hole 82b in the width direction (direction of arrow TW). In this case, the pressing force applied to the carrier tape 80 by the second tooth portion 52a of the second sprocket 52 has a width direction component that presses the carrier tape 80 in the width direction (direction of arrow TW) and a feed direction component that presses the carrier tape 80 in the feed direction (direction of arrow TC). Therefore, the carrier tape 80 is more likely to rotate around the first feed hole 82a, which is a round hole with a relatively small tolerance, and the width direction component of the pressing force makes it easier to reduce the amount of positional deviation of the carrier tape 80 in the width direction (direction of arrow TW).

[0042] 7 shows an example of the distribution of the feed position of the carrier tape 80 when the feed position of the carrier tape 80 is measured in the configuration shown in FIG. 8, similar to the region AR2 shown in the same figure. By rotating the carrier tape 80 as described above, the amount of misalignment in the width direction (direction of arrow TW) of the carrier tape 80 is reduced in the region AR3 compared to the region AR2. Furthermore, the region AR3 falls within the region AR0, which shows an example of the allowable range of misalignment. Furthermore, the region AR3 also falls within the region AR1, which shows an example of the target range of misalignment.

[0043] Thus, the phase difference is preferably an angle that falls within the allowable range for the feeding accuracy in both the width direction (direction of arrow TW) and the conveying direction (direction of arrow TC) of the carrier tape 80. As described above, the regions AR2 and AR3 shown in FIG. 7 can be obtained, for example, using an actual machine. For example, an operator can prepare a feeder 40 in which the rotation angle of the second sprocket 52 relative to the first sprocket 51 is increased or decreased, obtain the distribution of the feeding position of the carrier tape 80 as shown in FIG. 7, and obtain the rotation angle that falls within the region AR0. Note that the regions AR0 and AR1 can be set arbitrarily based on, for example, the required feeding accuracy.

[0044] 8, the second sprocket 52 preferably rotates relative to the first sprocket 51 in the advancing direction (arrow TC1 direction) of the carrier tape 80. This makes it easier for the second tooth portion 52a of the second sprocket 52 to apply a pressing force acting in the advancing direction (arrow TC1 direction) of the feed direction (arrow TC direction) to the carrier tape 80. Note that the second sprocket 52 can also be rotated relative to the first sprocket 51 in the retreating direction (arrow TC2 direction) of the carrier tape 80.

[0045] 8, when the carrier tape 80 is rotated by the same angle around the circular first feed hole 82a, the longer the distance between the first sprocket 51 and the second sprocket 52, the greater the phase difference (the angle of rotation of the second sprocket 52 relative to the first sprocket 51). Therefore, it is preferable to set the phase difference to a larger value as the distance between the first sprocket 51 and the second sprocket 52 increases. This allows the feeder 40 to rotate carrier tapes 80 of different dimensions in the width direction (arrow TW) by the same angle, and to feed the carrier tapes 80 in the same engagement state.

[0046] 2 to 4, the first sprocket 51 is a reference sprocket driven by a motor 53, and the second sprocket 52 is a driven sprocket that rotates as the first sprocket 51 is driven. Specifically, as shown in FIG. 2, the first sprocket 51 is connected to the motor 53 via a sprocket gear 51b and a reduction gear 54. As shown in FIG. 4, the second sprocket 52 is connected to the sprocket gear 51b and the first sprocket 51 by a shaft 50s. This allows the second sprocket 52 to rotate as the first sprocket 51 is driven.

[0047] The first sprocket 51 rotates relative to a sprocket gear 51b that is in phase with the second sprocket 52. Specifically, as shown in FIG. 4, the first sprocket 51 and the sprocket gear 51b are fixed to each other by a plurality of (four in FIG. 4) fastening portions 51c. The fastening portions 51c may be bolts, for example. The first sprocket 51 has a circumferentially extending slot formed at the portion where it is fixed by the fastening portions 51c, allowing the rotation angle of the first sprocket 51 relative to the sprocket gear 51b to be adjusted. This allows the first sprocket 51 to rotate relative to the sprocket gear 51b that is in phase with the second sprocket 52. In other words, the second sprocket 52 can rotate relative to the first sprocket 51, allowing the aforementioned phase difference to be achieved.

[0048] In this embodiment, the second feed holes 82b are designed to have a larger tolerance when the second sprocket 52 engages with them than when the first sprocket 51 engages with the first feed holes 82a. The second sprocket 52 is a driven sprocket that rotates as the first sprocket 51 is driven. Therefore, the second sprocket 52 easily rotates with the aforementioned feeding of the carrier tape 80. The first sprocket 51, driven by the motor 53, engages with the first feed holes 82a, which have a smaller tolerance than the second feed holes 82b. Therefore, the carrier tape 80 can be reliably fed pitchwise.

[0049] The details described in this specification may be modified or selected as appropriate. The details described in this specification may also be combined as appropriate. For example, the second feed hole 82b may be designed to have a smaller tolerance when the second sprocket 52 engages with the second sprocket 52 than when the first sprocket 51 engages with the first feed hole 82a. For example, the first feed hole 82a may be an elongated hole, and the second feed hole 82b may be a circular hole. The first sprocket 51 may be a driven sprocket, and the second sprocket 52 may be a reference sprocket.

[0050] 2. Example of Effects of the Embodiment According to the feeder 40, by providing a phase difference between the first sprocket 51 and the second sprocket 52, it is possible to suppress a decrease in the feeding accuracy of the carrier tape 80.

[0051] 40: Feeder, 50s: Shaft, 51: First sprocket, 51b: Sprocket gear, 52: Second sprocket, 53: Motor, 54: Reduction gear, 80: Carrier tape, 82a: First feed hole, 82b: Second feed hole, 82b1: Outer end, 91: Part, PP1: Supply position, Arrow TC direction: Conveying direction, Arrow TC1 direction: Traveling direction, Arrow TW direction: Width direction.

Claims

1. A feeder comprising: a first sprocket capable of engaging with a first feed hole, which is a feed hole formed at one end in the width direction of a carrier tape in which components are stored; and a second sprocket capable of engaging with a second feed hole, which is a feed hole formed at the other end in the width direction of the carrier tape; wherein the carrier tape is transported by both the first sprocket and the second sprocket to supply the components at a supply position, and the second sprocket has a phase difference rotated a predetermined angle relative to the first sprocket.

2. A feeder as described in claim 1, wherein the second feed hole is set to have a larger tolerance when the second sprocket engages with it compared to when the first sprocket engages with it, and the phase difference is an angle within a range that allows the second sprocket to engage with the second feed hole while a pressing force is applied to the carrier tape in the transport direction, so as to suppress a decrease in the feeding accuracy of the carrier tape caused by the tolerance of the second feed hole.

3. The feeder according to claim 2, wherein the first feed hole is a round hole, and the second feed hole is an oblong hole.

4. A feeder as described in claim 3, wherein the long hole is formed in an elliptical shape with its major axis set in a direction parallel to the width direction of the carrier tape, and the phase difference is an angle that allows the second sprocket to engage with the outer end side of the second feed hole in the width direction.

5. A feeder according to any one of claims 1 to 4, wherein the phase difference is an angle within the allowable range of feeding accuracy in each of the width direction and conveying direction of the carrier tape.

6. The feeder according to claim 1, wherein said second sprocket rotates relative to said first sprocket in the direction of travel of said carrier tape.

7. The feeder according to claim 1, wherein the phase difference is set to be greater as the distance between the first sprocket and the second sprocket increases.

8. The feeder according to claim 1, wherein the first sprocket is a reference sprocket driven by a motor, and the second sprocket is a driven sprocket that rotates as the first sprocket is driven.

9. The feeder according to claim 8, wherein the first sprocket is connected to the motor via a sprocket gear and a reduction gear, and the second sprocket is connected to the sprocket gear and the first sprocket by a shaft.

10. The feeder of claim 9, wherein said first sprocket rotates relative to said sprocket gear in phase with said second sprocket.

Images