JP2007285473A - Intermittent feeding unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an excessive radial load from acting on an energizing spring of each clutch by radial loads acting on each one-way clutch in an intermittent feeding unit for supporting a drive rotary body equipped with a drive side one-way clutch and a reverse rotation preventing rotary body equipped with a reverse rotation preventing side one-way clutch by two parallel supporting shafts, holding a top tape passing through a contact portion of the drive rotary body and the reverse rotation preventing rotary body, and feeding the top tape to a tape container in the rear. <P>SOLUTION: Each of pockets 34 and 43 of the drive side one-way clutch 26 and the reverse rotation prevention side one-way clutch 28 is provided biased in the circumferential direction. Radial bearings 37 and 46 are formed at parts other than where the pockets 34 and 43 are disposed. The radial bearings 37 and 46 are disposed to oppose a holding part 77 of the top tape 76. The radial load is received by the radial bearings 37 and 46. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an intermittent feed unit used in a tape feeder unit or the like, and more particularly to a load support structure.

  In the tape feeder unit attached to the chip mounter, the transport tape containing the electronic components is intermittently sent, and the top tape that acts as a lid for the transport tape is peeled off. An intermittent feed unit that feeds intermittently to the like is provided (Patent Document 1).

  Although there is no detailed disclosure of the one-way clutch used in the intermittent feed unit (rotary feed members 23 and 24) described in Patent Document 1, the outer diameter surface of the clutch member is used as the one-way clutch. A pocket having a wedge angle at equal intervals over the entire circumference, in which a roller and a biasing spring for biasing the roller in a narrow direction of the wedge angle are housed (Patent Document 2). The use is considered to be technical common sense in this field. FIG. 6 shows such an intermittent feed unit as a conventional example.

  The intermittent feed unit shown in FIG. 6 includes a drive-side one-way clutch 3 that is rotatably supported by one support shaft 1 of two parallel support shafts 1 and 2, and a reverse-rotation prevention side that is fixed to the other support shaft 2. A drive rotator 5 and a reverse rotation-preventing rotator 6 each comprising a spur gear are provided via a directional clutch 4. The one-way clutches 3 and 4 are respectively provided in pockets 9 and 10 having wedge angles θ and δ provided at regular intervals in the circumferential direction on the outer diameter surfaces of the clutch members 7 and 8, and rollers 11 and 12. Energizing springs 13 and 14 for energizing the rollers 11 and 12 in the narrow direction of the wedge angles θ and δ are housed.

  A top tape 17 is clamped in a clamping portion 15 in which the drive rotator 5 and the reverse rotation-preventing rotator 6 are in contact with each other, and a swinging member 16 integrated with the drive-side one-way clutch 3 is a winding direction of the top tape 17. The drive-side one-way clutch 3 is locked when the drive-side one-way clutch 3 is swung, and the drive rotor 5 is rotated in the feed direction (arrow A direction). Sex is given to each. When the oscillating member 16 is oscillated in the opposite direction, the driving side one-way clutch 3 is released, while the reverse rotation preventing side one-way clutch 4 is locked to prevent the top tape 17 from being reversely fed.

  As described above, the driving rotary body 5 is intermittently driven by the swinging motion of the swinging member 16 attached to the clutch member 7 of the driving side one-way clutch 3, and the top tape 17 is fed in a fixed direction, which is supplied to the tape container 18. To send.

The support shaft 1 is fixed to a fixed arm 19 fixed to the tape container 18, and the support shaft 2 is fixed to a swing arm 20.
JP 2003-273579 A Japanese Utility Model Publication No. 6-1859

  In the intermittent feed unit described above, the spur gears constituting the drive rotator 5 and the reverse rotation preventing rotator 6 mesh with each other so that the clamping portion 15 that clamps the top tape 17 serves as a load position. The rollers 11, 12 of the one-way clutch 4 on the reverse rotation prevention side pass through the load position, and a radial load is applied to the rollers 11, 12 each time the rollers 11 and 12 pass. At this time, the rollers 11 and 12 move to the enlargement side of the wedge angles θ and δ due to the presence of the cam surfaces 9 ′ and 10 ′ on the bottom surfaces of the pockets 9 and 10, compress the urging springs 13 and 14, and An excessive load is repeatedly applied to the springs 13 and 14. As a result, the urging springs 13 and 14 are fatigued early and so-called “sagging” occurs. As a result, the postures of the rollers 11 and 12 become unstable, and the functions of the one-way clutches 3 and 4 are impaired.

  Accordingly, an object of the present invention is to prevent early biasing of the biasing springs 13 and 14 and to extend the life of the one-way clutches 3 and 4.

  In order to solve the above-described problems, the present invention basically has the same configuration as that of the conventional example described above, as shown in FIGS. That is, the drive-side one-way clutch 26 rotatably supported by one of the two parallel support shafts 24, 25, and the reverse-rotation-prevention-side one-way clutch 28 fixed to the other support shaft 25. A drive rotator 27 and a reverse rotation preventing rotator 29 are provided respectively. The one-way clutches 26, 28 are respectively provided with rolling elements 35, 44 in pockets 34, 43 provided with wedge angles θ, δ at predetermined intervals in the circumferential direction on the outer diameter surfaces of the clutch members 32, 41, respectively. Energizing springs 36 and 45 for energizing the rolling elements 35 and 44 in the narrow direction of the wedge angles θ and δ are accommodated.

  A sandwiching portion 77 of the tape 76 is formed by a portion where the drive rotator 27 and the reverse rotation preventing rotator 29 are in contact with each other, and the swinging member 52 integral with the drive-side one-way clutch 26 is a winding direction of the tape 76. When the drive side one-way clutch 26 is locked and the drive rotating body 27 is rotated, the directionality in which the reverse rotation prevention side one-way clutch 28 becomes free at this time is the one-way clutch 26, 28, the pockets 34, 43 of the one-way clutches 26, 28 are provided in a circumferentially biased manner, and the radial bearing 37, 46 is formed, and both of the radial bearings 37 and 46 are disposed so as to face the sandwiching portion 77 of the tape 76.

  In the intermittent feed unit having the above-described configuration, when the swinging member 52 is swung in a certain direction, the driving side one-way clutch 26 is locked and the driving rotating body 27 is rotated in the feeding direction (arrow A), and the reverse rotation is prevented. The side one-way clutch 28 becomes free to feed the tape for one pitch. At this time, radial loads acting on the one-way clutches 26 and 28 are received by the radial bearings 37 and 46, respectively, and are prevented from being received via the rolling elements 35 and 44.

  As described above, in the intermittent feed unit of the present invention, the pockets 34 and 43 constituting the clutch functions of the drive-side one-way clutch 26 and the reverse-rotation-preventing-side one-way clutch 28 are biased and the radial bearing 37 is formed by the remaining portion. , 46 are formed and the radial bearings 37, 46 receive the radial load, so that an overload acts on the biasing springs 36, 45 of the rolling elements 35, 44 accommodated in the pockets 34, 43. Can be avoided. Thereby, the posture maintenance function of the rolling elements 35 and 44 by the biasing springs 36 and 45 is exhibited over a long period of time, and stable intermittent feeding can be performed.

  Hereinafter, embodiments of the present invention will be described using examples.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the intermittent feeding unit of the embodiment includes a pair of parallel fixed arms 22 and 22 ′ provided on the tape container 21 and a pair of parallel arms attached to the upper stage so as to be swingable in the vertical direction. It is supported by two parallel support shafts 24 and 25 fixed to the swing arms 23 and 23 ', respectively.

  A drive rotating body 27 made of a spur gear is provided on a support shaft 24 attached to the fixed arms 22 and 22 'via a drive-side one-way clutch 26, and a support shaft 25 attached to the swing arms 23 and 23'. Further, a reverse rotation preventing rotating body 29 made of a similar spur gear is provided via a reverse rotation preventing side one-way clutch 28.

  The swing arms 23 and 23 ′ are always biased downward by a spring 31, thereby pressing the reverse rotation preventing rotator 29 against the drive rotator 27.

  As shown in FIGS. 1 and 5, the drive-side one-way clutch 26 has a clutch member 32 rotatably attached to the support shaft 24, and is relatively rotatable on the outer diameter surface of the clutch member 32. It comprises a fitted outer ring member 33, a plurality of pockets 34 formed on the outer diameter surface of the clutch member 32, rollers 35 housed in the respective pockets 34, and biasing springs 36 thereof. The pockets 34 are provided at four locations so as to be offset in the range of about half of the outer diameter surface of the clutch member 32. The other half of the outer diameter surface of the clutch member 32 is a radial bearing 37. An axial lubricating oil pool groove 38 is provided in the circumferential intermediate portion of the radial bearing 37.

  A cam surface 39 inclined in a constant circumferential direction is formed on the bottom surface of each pocket 34, and an angle θ formed by a tangent drawn to the inner diameter surface of the outer ring member 33 facing the cam surface 39 is called a wedge angle. .

  Further, the one-way clutch 28 on the reverse rotation prevention side includes a clutch member 41 fixed to the support shaft 25, an outer ring member 42 fitted to the outer diameter surface of the clutch member 41 so as to be relatively rotatable, and the clutch It comprises a plurality of pockets 43 formed on the outer diameter surface of the member 41, rollers 44 housed in the pockets 43, and biasing springs 45 thereof. The pocket 43 is provided so as to be offset in the range of about half of the outer diameter surface of the clutch member 41, and the remaining half is a radial bearing 46. A lubricating oil reservoir groove 47 in the axial direction is provided in the circumferential intermediate portion of the radial bearing 46.

  As shown in FIG. 2, the support shaft 24 of the drive-side one-way clutch 26 is formed by a bolt, and one fixed arm 22 is inserted into the bolt head 48 side, and further through the washer 49. The clutch member 32 is rotatably fitted. A flange 51 is provided at one end of the clutch member 32, and a boss 60 of the swing member 52 is fitted to the flange 51 via D-cut detents 57 and 57 '(see FIG. 5). The The oscillating member 52 is provided with two oscillating arms 53, 54 protruding outward from the boss 60 at an interval of about 90 degrees, and is not shown at the free end of one of the oscillating arms 53. While the link is connected, one end of the tension type coil spring 55 is locked to the free end of the other swing arm 54.

  The urging spring 36 is formed by cutting and bending the outer peripheral portion of the annular portion 56 as shown in FIG. Further, the outer ring member 33 is provided with an axial rotation preventing recess 50 on the outer peripheral surface thereof.

  In addition, the drive rotator 27 is provided with a gear portion 58 on its outer peripheral surface and a closing portion 59 at one end thereof. Further, a rotation preventing projection 61 is provided on the inner diameter surface of the drive rotating body 27 and is fitted to the rotation stopping recess 50.

  The fixed arm 22 ′ is fitted to the outer surface of the closing portion 59 of the drive rotating body 27 via a washer 62, and a nut 63 is screwed to the outside of the fixed arm 22 ′.

  On the other hand, as shown in FIG. 3, the support shaft 25 of the one-way clutch 28 on the reverse rotation prevention side is formed by a bolt, and one swinging arm 23 is inserted on the bolt head 65 side, and a washer 66, The clutch member 41 is fitted through the lid member 67. The support shaft 25 is provided with a D-cut portion 68, and the clutch member 41 fitted to the support shaft 25 is prevented from rotating by the D-cut portion 68.

  The biasing spring 45 is formed by bending an outer peripheral portion of an annular portion 69 similar to the annular portion 56 shown in FIG. Further, an axial rotation preventing recess 71 (see FIG. 1) is provided on the outer peripheral surface of the outer ring member 42.

  Further, the reverse rotation preventing rotating body 29 is provided with a gear portion 72 on its outer peripheral surface and a closing portion 73 at one end thereof. Further, a detent projection 70 provided on the inner diameter surface of the reverse rotation preventing rotating body 29 is fitted with the detent recess 71.

  The lid member 67 is fitted to the open portion of the reverse rotation preventing rotating body 29, and the swing arm 23 ′ is fitted to the outer surface of the closing portion 73 via a washer 74. A nut 75 is screwed onto the outer side of '.

  As shown in FIGS. 1 and 4, the drive rotator 27 and the reverse rotation preventing rotator 29 described above are engaged with each other with the gear portions 58 and 72, and a sandwiching portion 77 for the top tape 76 is formed at the meshed portion. The A predetermined pressing force is applied to the clamping portion 77 by a spring 31 acting on the swing arms 23 and 23 '. The radial bearing 37 of the driving-side one-way clutch 26 and the radial bearing 46 of the reverse-rotation-preventing-side one-way clutch 28 are arranged so as to be positioned on both sides (up and down) of the clamping portion 77.

  The top tape 76 drawn out to the tape container 21 side through the clamping part 77 is fed into the tape container 21 through an inlet 78.

  If the swing member 52 is swung in the direction of arrow a (see FIG. 4), the clutch member 32 integrated with the swing member 52 rotates in the direction of arrow A. As a result, the roller 35 engages with the wedge angle θ, so that the driving side one-way clutch 26 is locked, and the driving rotating body 27 is rotated in the direction of arrow A (see FIG. 1). At this time, the reverse rotation-preventing rotating body 29 engaged through the sandwiching portion 77 is driven and rotated in the arrow A direction. As a result, the top tape 76 is fed to the tape container 21 side by one pitch. At this time, the rollers 44 of the one-way clutch 28 on the reverse rotation prevention side move in the direction of increasing the wedge angle δ, so the reverse rotation prevention rotating body 29 is in a free state.

  In the clamping portion 77, the driving-side one-way clutch 26 and the reverse-rotation-preventing-side one-way clutch 28 simultaneously receive a radial load R (see FIG. 4), but the load R is received by both radial bearings 37 and 46. . Therefore, the rollers 35 and 44 do not receive the load R, and the urging springs 36 and 45 act only to urge the rollers 3544, respectively, and stably maintain the postures of the rollers 35 and 44 over a long period of time. Demonstrate the function.

  When the swinging member 52 swings in the direction of the arrow b, the drive-side one-way clutch 26 is free, but the reverse rotation prevention side one-way clutch 28 is locked to prevent reverse rotation of the reverse rotation prevention rotating body 29. The top tape 76 is prevented from being reversely fed.

  In the above embodiment, the drive rotator 27 and the reverse rotation preventing rotator 29 are configured by spur gears. However, when the tension acting on the top tape 76 is relatively low, it is configured by a roller. can do.

Longitudinal front view of the embodiment Sectional view along line XX in FIG. Sectional view of the YY line of FIG. Front view of the embodiment Exploded perspective view of drive rotor side same as above Longitudinal front view of conventional example

Explanation of symbols

21 Tape container 22, 22 ′ Fixed arm 23, 23 ′ Swing arm 24 Support shaft 25 Support shaft 26 Drive-side one-way clutch 27 Drive rotor 28 Reverse-rotation prevention one-way clutch 29 Reverse-rotation prevention rotor 31 Spring 32 Clutch member 33 Outer ring member 34 Pocket 35 Roller (rolling element)
36 Biasing spring 37 Radial bearing 38 Lubricating oil pool groove 39 Cam surface 41 Clutch member 42 Outer ring member 43 Pocket 44 Roller (rolling element)
45 Biasing spring 46 Radial bearing 47 Lubricating oil pool groove 48 Bolt head 49 Washer 50 Non-rotating recess 51 Collar 52 Swing member 53, 54 Swing arm 55 Coil spring 56 Annular portion 57, 57 'Non-rotating portion 58 Gear Portion portion 59 Blocking portion 60 Boss portion 61 Anti-rotation convex portion 62 Washer 63 Nut 65 Bolt head portion 66 Washer 67 Lid member 68 D cut portion 69 Annular portion 70 Anti-rotation convex portion 71 Anti-rotation concave portion 72 Gear portion 73 Closure portion 74 Washer 75 Nut 76 Top tape (tape)
77 Entrance 78

Claims (3)

Drive side one-way clutch (26) rotatably supported on one support shaft (24) of two parallel support shafts (24) and (25), and reverse rotation prevention side fixed to the other support shaft (25) A drive rotator (27) and a reverse rotation-preventing rotator (29) are provided through the one-way clutch (28), respectively, and the one-way clutches (26) and (28) are respectively connected to the clutch members (32) and (41). The rolling elements (35) and (44) and the respective rolling elements (35) and (44) are wedged into pockets (34) and (43) provided with wedge angles θ and δ at predetermined intervals in the circumferential direction on the outer diameter surface. Energizing springs (36) and (45) for energizing in the narrow direction of the angles θ and δ are housed, and the tape is formed by the portion where the drive rotating body (27) and the reverse rotation preventing rotating body (29) are in contact with each other. A sandwiching portion (77) of (76) is formed, and the drive side one side When the swinging member (52) integrated with the clutch (26) is swung in the winding direction of the tape (76), the driving one-way clutch (26) is locked and the driving rotating body (27) is rotated. At this time, in the intermittent feed unit in which the one-way clutch (26) (28) is provided with a directionality in which the one-way clutch (28) on the reverse rotation prevention side is free,
Pockets (34) and (43) of the one-way clutches (26) and (28) are provided in a circumferentially biased manner, and radial bearings (37) ( 46), and the radial bearings (37) and (46) are disposed so as to oppose the clamping part (77) of the tape (76).   2. The drive rotating body (27) and the reverse rotation preventing rotating body (29) are formed by spur gears meshed with each other, and the clamping portion (77) is formed by the meshing portion. The intermittent feed unit described in 1.   3. The intermittent feed unit according to claim 1, wherein each of the radial bearings (37) (46) is formed over a half circumference of an outer diameter surface of each clutch member (32) (41).

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