JP2007113767A - Intermittent winding unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the axial size of the whole winding unit equipped with a winding one-way clutch and a reverse rotation preventing one-way clutch. <P>SOLUTION: This intermittent winding unit has the winding one-way clutch 23 and the reverse rotation preventing one-way clutch 31 interposed between a swing member 11 and a winding member 19. The winding one-way clutch 23 comprises a pocket 27 formed at the inner diameter surface of an outer annular member 24 fitted to the outer diameter surface of a sleeve 7 integral with the swing member 11, and a roller 25 enclosed in the pocket 27. The reverse rotation preventing one-way clutch 31 comprises a pocket 35 formed facing an outer cylinder 3a of a fixed shaft member 20 at the outer diameter surface of the outer annular member 24, and a ball 36 enclosed in the pocket 35. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intermittent winding unit used in a tape feeder unit or the like, and is particularly intended to make the axial direction compact.

  In the tape feeder unit mounted on 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, and the stripped top tape is intermittent A take-up unit is provided for taking up.

As such an intermittent winding unit, a swinging member on the input side and a winding member on the output side are rotatably mounted on a fixed shaft, and the winding member is wound between the swinging member and the winding member. And a one-way clutch for preventing reverse rotation is interposed between the winding member and the fixed shaft, respectively. The one-way clutch for winding is a winding direction of the swinging member. The one-way clutch for preventing reverse rotation is configured so as to be free when rotating in the winding direction of the winding member. One is known (Patent Document 1).
Japanese Patent Laid-Open No. 2001-41265 (FIG. 1)

  The intermittent winding unit disclosed in Patent Document 1 has a problem of lack of axial compactness because two types of one-way clutches for winding and for preventing reverse rotation are arranged side by side in the axial direction. .

  Therefore, an object of the present invention is to provide an intermittent winding unit that achieves axial compactness by combining the two one-way clutches in a coaxial state, that is, in a radial direction.

  In order to solve the above-mentioned problem, as shown in FIG. 1, the present invention is such that the input-side swing member 11 and the output-side winding member 19 are rotatable on the fixed shaft 2 of the fixed shaft member 20. A one-way clutch 23 for winding is provided between the swinging member 11 and the winding member 19, and a one-way clutch 31 for preventing reverse rotation is provided between the winding member 19 and the fixed shaft 2. The one-way clutch 23 for winding is locked to transmit a winding torque when the swinging member 11 swings in the winding direction (see arrow a in FIG. 2), and prevents reverse rotation. The one-way clutch 31 is based on an intermittent winding unit having a free directionality.

  In addition, in the present invention, the one-way clutch 23 for winding is integrated with the swing member 11 and is rotatably fitted to the fixed shaft 2, and the outer diameter of the sleeve 7. An outer ring member 24 fitted to the surface, a pocket 27 formed with a winding side cam surface 28 facing the sleeve 7 on the inner diameter surface of the outer ring member 24 and having a wedge angle θ on the bottom surface; It consists of a winding-side rolling element (roller) 25 housed in the pocket 27.

  Further, the one-way clutch 31 for preventing reverse rotation includes the outer cylinder portion 3a that is integral with the fixed shaft member 20 and faces the outer diameter surface of the outer ring member 24, and the outer diameter surface of the outer ring member 24. The pocket 35 is formed with a reverse-rotation-preventing-side cam surface 38 facing the inner surface of the outer cylindrical portion 3a and having a wedge angle δ at the bottom, and a reverse-rotation-preventing-side rolling element (ball) 36 housed in the pocket 35. .

  The wedge angle θ of the winding side cam surface 28 is inclined in the direction in which the winding side rolling element 25 is locked when the swinging member 11 swings in the winding direction, and the wedge angle of the reverse rotation prevention side cam surface 38. δ is inclined in a direction in which the reverse rotation preventing side rolling element 36 becomes free when the swinging member 11 swings in the winding direction.

  In the intermittent winding unit having the above-described configuration, when the swing member 11 is swung in the direction of arrow a shown in FIG. Locks and transmits torque to rotate the winding member 19 in the winding direction A (see FIGS. 2 and 3). As a result, winding of one pitch of the top tape is performed. At this time, the one-way clutch 31 for preventing reverse rotation is free. When the swing member 11 is swung in the direction of the arrow b, the one-way clutch 23 for winding is released and the swing member 11 returns to its original state. In the one-way clutch 31 for preventing reverse rotation, the ball 36 moves and locks in the direction of the wedge angle δ, thereby preventing reverse rotation (co-rotation) of the winding member 19.

  As described above, in the intermittent winding unit of the present invention, the outer ring member 24 common to the one-way clutch 23 for winding and the one-way clutch 31 for preventing reverse rotation is provided, and the inner ring side of the outer ring member 24 is provided. Since the one-way clutch 23 for winding and the one-way clutch 31 for preventing reverse rotation are provided on the outer diameter side, there is an effect that the axial size of the entire unit is made compact.

  Further, since the pockets 27 and 35 of the one-way clutches 23 and 31 are provided on the inner surface and the outer surface of the outer ring member 24, the number of parts can be reduced. Further, the pocket 35 is inserted into one end portion of the detent groove 33 by inserting the detent rib 34 of the winding member 19 in the axial direction into the detent groove 33 formed on the outer diameter surface of the outer ring member 24. The winding member 19 can be prevented from rotating at the same time.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The intermittent winding unit shown in FIGS. 1 to 5 has a fixed shaft member 20 fixed to the housing 1. The fixed shaft member 20 includes a fixed shaft 2, a collar portion 3 provided at one end thereof, and an outer cylinder portion 3 a provided on the outer diameter surface of the collar portion 3 so as to face the outer diameter surface of the fixed shaft 2. Consists of. A screw hole 4 is provided on the opposite surface of the fixed shaft 2, the end surface provided with the screw hole 4 is pressed against the inner surface of the housing 1, and the fixed shaft member 20 is moved to the housing by a bolt 5 screwed from the outer surface of the housing 1. 1 is fixed.

  A sleeve 7 is rotatably fitted between the housing 1 and the outer diameter surface of the fixed shaft 2 via a spacer 6. The sleeve 7 is provided with a collar 9 having a D-cut portion 8 (see FIG. 4A) on the outer diameter surface of the end portion on the housing 1 side, and a swinging member 11 as an input member is fitted into the collar 9. .

  The rocking member 11 has a boss portion 13 as shown in FIGS. The boss portion 13 is formed with a hole 12 having a D-cut portion 8 ′ fitted to the collar 9. A first swing arm 14 extending downward from the outer peripheral edge of the boss portion 13 and a second swing arm 15 extending sideward are provided. A link mechanism (not shown) is connected to the tip of the first swing arm 14 and is driven with a fixed swing angle as shown by arrows a and b in FIG. A coil spring 16 is interposed between the distal end of the second swing arm 15 and the housing 1. The coil spring 16 expands and contracts according to the swinging direction of the arrows a and b to exert a spring force. The sleeve 7 and the swing member 11 may be formed as an integral part.

  An outer ring member 24 is rotatably fitted to the outer diameter surface of the sleeve 7, and one end surface of the outer ring member 24 is in contact with the inner surface of the collar portion 3 of the fixed shaft member 20. A spacer 17 is interposed between the other end surface of the outer ring member 24 and the collar 9 of the sleeve 7.

  The outer ring member 24 is a common member for the one-way clutch 23 for winding and the one-way clutch 31 for preventing reverse rotation. The one-way clutch 23 for winding includes the outer ring member 24, a pocket 27 formed on the inner surface of the outer ring member at a predetermined interval in the circumferential direction, a roller 25 accommodated in the pocket 27, and an attachment. It is comprised with the said spring 7 and the said sleeve 7 which the roller 25 contacts. The pocket 27 is provided over the entire length of the outer ring member 24 in the axial direction, and the roller 25 has the same length as the pocket 27.

  A winding side cam surface 28 is formed on the bottom surface of the pocket 27. The winding-side cam surface 28 is inclined so that the depth of the bottom surface gradually decreases in the radial direction when viewed in the swinging direction when the swinging member 11 is wound (see arrow a in FIGS. 2 and 3). The wedge angle θ is formed between the sleeve 7 and the outer diameter surface of the sleeve 7 by the inclination. The roller 25 is urged by the urging spring 26 in the direction in which the wedge angle θ is formed.

  A winding member 19 as an output member is fitted to the outer diameter surface of the outer ring member 24. A cylindrical boss portion 32 protruding toward the collar portion 3 side of the fixed shaft member 20 is formed at the center portion of the winding member 19, and the boss portion 32 is fitted to the outer diameter surface of the outer ring member 24. The Further, on the inner diameter surface of the boss portion 32, a detent rib 34 that is inserted in the axial direction with respect to the detent groove 33 formed on the outer diameter surface of the outer ring member 24 is formed. The anti-rotation rib 34 is formed to a length that slightly protrudes from the boss portion 32 in the axial direction. The protrusion amount is indicated by L1 (see FIGS. 1 and 5B).

  As shown in FIGS. 5A and 5B, the one-way clutch 31 for preventing reverse rotation has a predetermined interval in the circumferential direction between the outer ring member 24 and the outer diameter surface of the outer ring member 24. And a ball 36 accommodated in the pocket 35, an urging spring 37, and the outer cylindrical portion 3 a of the fixed shaft member 20 with which the ball 36 contacts. The pocket 35 is formed at one end of the detent groove 33 provided over the entire length of the outer ring member 24. That is, the anti-rotation groove 33 is formed in the same cross-sectional shape as the pocket 35, and when the anti-rotation rib 34 is inserted into the anti-rotation groove 33, the tip of the anti-rotation rib 34 and the end of the anti-rotation groove 33 are In the meantime, the pocket 35 is formed. The length of the pocket 35 in the axial direction is indicated by L2 (see FIGS. 1 and 5B). The tip of the boss portion 32 abuts the outer cylinder portion 3a of the fixed shaft member 20 in the axial direction.

  A cam surface 38 (see FIG. 3) for preventing reverse rotation is formed on the bottom surface of the pocket 35. The reverse-rotation-preventing cam surface 38 has an inclination that makes the bottom surface gradually shallower when viewed in the swinging direction when the swinging member 11 is wound (see arrow a in FIGS. 2 and 3). A wedge angle δ is formed between the inner surface of the outer cylindrical portion 3a of the fixed shaft member 20 due to the inclination. The ball 36 is urged by the urging spring 37 in the direction of the wedge angle δ. When the ball 36 moves relative to the direction in which the wedge angle δ is formed, the one-way clutch 31 for preventing reverse rotation is locked, and when the ball 36 moves relative to the wedge angle δ in the opposite direction, it becomes a free state.

  The winding member 19 is shown as a gear in the case of illustration, and is gear-coupled to a winding pulley (not shown). The gear coupling may be omitted, and the winding member 19 may be a pulley itself.

As described above, as shown in FIG. 1, as a result of the front end portion of the detent rib 34 formed on the inner diameter surface of the boss portion 32 of the winding member 19 protruding in the axial direction by L1 from the boss portion 32, By fastening the bolt 5 to the housing 1, the winding member 19 can be stabilized in the axial direction, and at the same time, the winding member 19 can be positioned in the radial direction by the detent rib. The mounting accuracy of 19 is improved.
However, when positioning accuracy is not particularly required, a structure in which the axial lengths of the detent rib 34 and the boss portion 32 are aligned as shown in FIG. In this case, the rotation prevention rib 34 and the boss portion 32 are set to a length that leaves a pocket 35 having a length L2 at one end portion of the rotation prevention groove 33.

  The fixed shaft member 20 is described as being formed as a single component. However, as shown in FIG. 4 (b), the fixed shaft member 20 is a component composed of the fixed shaft 2 and the flange portion 3. And two parts of the annular outer cylinder portion 3a, and may be coupled via a detent structure such as the D-cut portions 39, 39 ′.

  The intermittent winding unit of the embodiment is configured as described above, and the operation thereof will be described next. When the oscillating member 11 is oscillated in the direction of arrow a shown in FIG. 2, the sleeve 7 integrated with the oscillating member 11 rotates in that direction, so that the roller 25 is relatively moved in the direction of the wedge angle .theta. (See FIG. 3). As a result, the one-way clutch 23 for winding is locked, and torque is transmitted through the outer ring member 24 and the non-rotating rib 34 so that the winding member 19 is wound in the winding direction A (see FIGS. 2 and 3). ) To rotate. As a result, winding of one pitch of the top tape is performed. At this time, the one-way clutch 31 for preventing reverse rotation becomes free because the ball 36 moves relative to the direction opposite to the wedge angle δ and does not hinder winding.

  Next, when the swinging member 11 is swung in the direction of arrow b, the one-way clutch 23 for winding becomes free as a result of the relative movement of the roller 25 in the direction opposite to the wedge angle θ, and the swinging member 11 is wound. It rotates together with the sleeve 7 without applying reverse torque to the take-up member 19 and returns to the original state. In this case, if torque in the reverse rotation direction is applied to the winding member 19 from the top tape or the like, the ball 36 moves in the direction of the wedge angle δ in the one-way clutch 31 for preventing reverse rotation, and the outer cylinder portion 3a. However, since the lock does not affect the rotation of the sleeve 7 and the swinging member 11 integral therewith, the swinging member 11 is the original. There will be no fluctuation in the torque when returning to the state.

(A) Longitudinal side view of the embodiment, (b) Partial sectional view of a modification of the figure (a) Sectional view along line XX in FIG. FIG. 1 is a partially omitted enlarged cross-sectional view taken along line YY in FIG. (A) Exploded perspective view of the embodiment, (b) Partial perspective view of the modified example same as above. (A) Partially exploded perspective view of Example, (b) Perspective view of combined state of (a) figures

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Fixed shaft 3 Collar part 3a Outer cylinder part 4 Screw hole 5 Bolt 6 Spacer 7 Sleeve 8, 8 'D cut part 9 Collar 11 Swing member 12 Hole 13 Boss part 14 Swing arm 15 Swing arm 16 Coil spring 17 Spacer 19 Winding member 20 Fixed shaft member 23 One-way clutch 24 Outer ring member 25 Roller 26 Energizing spring 27 Pocket 28 Winding-side cam surface 31 One-way clutch 32 Boss portion 33 Non-rotating groove 34 Non-rotating rib 35 Pocket 36 Ball 37 Biasing spring 38 Reverse rotation prevention cam surface 39, 39 'D cut part

Claims (6)

An input-side swinging member (11) and an output-side winding member (19) are rotatably mounted on the fixed shaft (2) of the fixed shaft member (20), and the swinging member (11) and the winding-up member are wound up. A one-way clutch (23) for winding between the member (19) and a one-way clutch (31) for preventing reverse rotation between the winding member (19) and the fixed shaft (2), respectively. A direction in which the one-way clutch (23) for winding is locked and the one-way clutch (31) for preventing reverse rotation is free when the swinging member (11) swings in the winding direction. In intermittent winding units each having
The one-way clutch (23) for winding and the one-way clutch (31) for preventing reverse rotation have a common outer ring member (24), and the one-way clutch (23) for winding A sleeve (7) integrally fitted with the moving member (11) and rotatably fitted to the fixed shaft (2); and the outer ring member (24) fitted to the outer diameter surface of the sleeve (7). A pocket (27) in which a winding side cam surface (28) having a wedge angle θ on the bottom surface is formed on the inner surface of the outer ring member (24) and facing the sleeve (7); 27) and a winding side rolling element (25) housed in
The one-way clutch (31) for preventing reverse rotation includes an outer cylindrical portion (3a) that is integral with the fixed shaft member (20) and faces the outer diameter surface of the outer ring member (24), and the outer ring member ( 24) an outer diameter surface of the outer cylinder portion (3a) facing the inner diameter surface of the outer cylinder portion (3), and a pocket (35) having a cam surface (38) for preventing reverse rotation having a wedge angle δ on the bottom surface; ) Stored in the reverse rotation prevention side rolling element (36),
The wedge angle θ of the winding-side cam surface (28) is inclined in the direction in which the winding-side rolling element (25) is locked when the swinging member (11) swings in the winding direction, and the reverse rotation prevention side The wedge angle δ of the cam surface (38) is tilted in the direction in which the reverse rotation preventing side rolling element (36) is free when the swinging member (11) swings in the winding direction. unit.   The pocket (35) of the one-way clutch (31) for preventing reverse rotation is formed in a non-rotating groove (33) formed on the outer diameter surface of the outer ring member (24) over the entire length, and the winding is shorter than this. The intermittent winding unit according to claim 1, characterized in that it is formed by inserting a detent rib (34) of the member (19).   The intermittent rotation according to claim 2, wherein the detent rib (34) protrudes in an axial direction from the boss portion (32) on an inner diameter surface of the boss portion (32) of the winding member (19). Winding unit.   The intermittent winding unit according to any one of claims 1 to 3, wherein the winding side rolling element (25) is a roller and the reverse rotation preventing side rolling element (36) is a ball.   The fixed shaft member (20) is provided on the fixed shaft (2), a collar portion (3) provided at an end of the fixed shaft (2), and an outer diameter surface of the collar portion (3). The intermittent winding unit according to any one of claims 1 to 4, wherein the intermittent winding unit comprises the outer cylinder portion (3a).   The outer cylinder part (3a) of the fixed shaft member (20) is formed separately from the collar part (3), and the outer cylinder part (3a) is interposed between the collar part (3) via a detent structure. The intermittent winding unit according to claim 5, wherein the intermittent winding unit is fitted.

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