CN215666132U - Engaging member and winding device - Google Patents

Abstract

The utility model provides a locking member and a winding device. The stopper (31) is attached to a shaft member provided in a winding device that winds the spun yarn into a package. The stopper (31) is provided with an engaging portion (32), a 1 st handle (35), a 2 nd handle (36), a 1 st coupling portion (33), and a 2 nd coupling portion (34). The engaging portion (32) is curved. The 1 st connecting part (33) and the 2 nd connecting part (34) extend in the 2 nd direction, and connect the engaging part (32) with the 1 st handle (35) and the 2 nd handle (36).

Description

Engaging member and winding device

Technical Field

The present invention relates to an engaging member and a winding device.

Background

As a conventional textile machine, for example, japanese patent application laid-open publication No. 2015-78037 discloses the following structure: the yarn winding device includes a winding device for winding a yarn around a bobbin held by a package holding section to form a package.

The winding device is provided with: the yarn winding device includes a package holding section for rotatably supporting a bobbin or a package, a contact roller for contacting the package to rotate the package, and a switching section having a driving section for rotating the package holding section around a rotation axis, the switching section separating the package holding section from the package. Further, a frame for fixing the winding device and a conveyor for conveying the wound package are provided around the winding device.

In such a winding device, the switching portion is attached by a fixing member such as a nut or a positioning ring. In maintenance, the switching unit is removed from the winding device. However, since the frame for fixing the winding device and the conveyor for conveying the package are provided around the winding device, there is no space for detaching the fixing members such as the nut and the positioning ring for fixing the switching portion. Therefore, conventionally, it has been desired to shorten the maintenance time and simplify the maintenance in order to remove the switching unit and remove the entire winding device.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present invention is to facilitate attachment and detachment of the switching section.

An engagement member according to an aspect of the present invention is an engagement member to be attached to a shaft member of a winding device that winds a spun yarn into a package, the engagement member including: an engaging portion having a curved shape at least partially curved in a 1 st direction and extending in a 2 nd direction orthogonal to the 1 st direction; a handle portion provided at a position apart from the engaging portion in the 2 nd direction; and a pair of connecting portions extending in the 2 nd direction and connecting the engaging portion and the handle portion. At least one of the engaging portion, the handle portion, and the connecting portion is formed of an elastic member.

In this configuration, since the engaging member is provided with the handle portion, the engaging member can be attached to and detached from the winding device without using a tool.

The engaging portion, the grip portion, and the connecting portion may be formed of a single linear member. With this configuration, since the processing for connecting the respective portions is not required, the manufacturing cost of the engaging member can be further reduced.

In the engaging member, it is also possible that: the handle portion extends in a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction. Thus, when the engaging member is attached to and detached from the winding device, the fingers of the operator holding the grip portion can be positioned on the opposite side of the switching portion in the 3 rd direction.

In the engaging member, it is also possible that: the curved shape of the engaging portion is circular. This can increase the contact area with the shaft member to which the switching portion is attached, and can prevent the engaging member from falling off.

In the engaging member, it is also possible that: the coupling portion has a 1 st coupling portion connected to one end of the engagement portion and a 2 nd coupling portion connected to the other end of the engagement portion, and the 1 st coupling portion and the 2 nd coupling portion form an intersection when viewed from a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction. Thus, the inner diameter of the engaging portion can be changed by moving the grip portion in the approaching direction, and the engaging member can be attached to the shaft member from the 3 rd direction.

In the engaging member, it is also possible that: the intersection is formed at a position apart from the engaging portion in the 2 nd direction. This prevents the 1 st connecting portion and the 2 nd connecting portion from overlapping with the end of the engaging portion when the engaging member is attached to the shaft portion. Therefore, the engaging member can be stably attached to the shaft portion.

Both ends of the engaging portion may be spaced apart in the 2 nd direction. This prevents the end portions of the engaging portion from overlapping each other when the engaging member is attached to the shaft portion. Therefore, the engaging member can be stably attached to the shaft portion.

In the engaging member, it is also possible that: the handle part comprises a 1 st handle part connected with the 1 st connecting part and a 2 nd handle part connected with the 2 nd connecting part, wherein the 1 st handle part and the 2 nd handle part are respectively in a circular arc shape, and the end part of the 1 st handle part and the end part of the 2 nd handle part are positioned on one side of the 1 st direction. This can increase the contact area between the 1 st and 2 nd grip parts and the fingers of the operator. Further, the end of the 1 st grip portion and the end of the 2 nd grip portion are positioned on the same side in the 1 st direction, so that the manufacturing process of the engaging member can be simplified and the engaging member can be manufactured at low cost.

An engagement member according to an aspect of the present invention is an engagement member to be attached to a shaft member of a winding device that winds a spun yarn into a package, the engagement member including: an engaging portion having a curved shape on a plane formed by a 1 st direction and a 2 nd direction orthogonal to the 1 st direction; a 1 st handle part and a 2 nd handle part which are arranged at positions separated from the clamping part in the 2 nd direction; a 1 st connecting part connected to one end of the engaging part and the 1 st handle part; and a 2 nd connecting portion connected to the other end of the engaging portion and the 2 nd handle portion, at least one of the engaging portion, the handle portion, and the connecting portion being formed of an elastic member, the engaging portion, the 1 st handle portion, the 2 nd handle portion, the 1 st connecting portion, and the 2 nd connecting portion being formed of one linear member, the 1 st handle portion and the 2 nd handle portion extending in a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction, both ends of the engaging portion being separated in the 2 nd direction, the 1 st connecting portion and the 2 nd connecting portion forming an intersection point when viewed from the 3 rd direction, the intersection point being formed at a position separated from the engaging portion in the 2 nd direction.

The 1 st handle portion and the 2 nd handle portion can be moved in the direction of approaching to move the end portions of the engaging portion in the direction of separating from each other. Thus, the engaging member can be attached to and detached from the winding device without using a tool. Further, the end portions of the engaging portion are separated from each other, and the intersection is formed at a position separated from the engaging portion in the 2 nd direction, so that the engaging member can be stably attached to the shaft portion.

The winding device may be: the winding unit includes the engaging member, and the winding unit includes: a shaft member having an engaged portion provided on one end side and engaged with the engaging portion, and a support portion provided on the other end side; and a switching part which is turned around between the engaged part and the support part on the shaft member, wherein the length of the connecting part in the 2 nd direction is larger than the length from the engaged part to the end part of the switching part near the engaged part in the radial direction of the shaft member. In this case, the grip portion is located outside the switching portion, and therefore, the engagement member can be easily attached and detached, and the switching portion can be easily attached and detached to and from the shaft member.

It can also be: the engaged portion is formed with a groove having a predetermined length in a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction, the engaging portion extends in a circular cross section formed with a predetermined radius, the groove has a length in the 3 rd direction of 2 times or more the radius of the engaging portion, and a depth in a plane formed with the 1 st direction and the 2 nd direction of 1.5 times or more the radius. This allows the wall surface to contact the engaging portion so as to be tangent to the engaging portion. Therefore, even if the switching portion moves in the 3 rd direction and comes into contact with the engagement portion, the engagement portion can be prevented from moving in a direction in which the engagement portion falls off the groove. Therefore, the engaging member can be stably attached.

Drawings

Fig. 1 is a front view of a spinning machine according to an embodiment of the present invention.

Fig. 2 is a side view of a spinning unit of the spinning machine of fig. 1.

Fig. 3 is a block diagram showing the main structure of the spinning machine.

Fig. 4 is a perspective view showing a winding device included in the spinning machine of fig. 1.

Fig. 5 is a side view showing a state of the winding device at the time of winding.

Fig. 6a is a plan view of the stopper according to embodiment 1.

Fig. 6b is a side view of the stopper according to embodiment 1.

Fig. 7 is a sectional view of the rotation link to which the stopper is attached.

Fig. 8 is a partially enlarged view of the 1 st switching portion 60 in a state where the stopper 31 is attached.

Fig. 9a is a perspective view of a stopper according to embodiment 2.

Fig. 9b is a plan view of the stopper according to embodiment 2.

Fig. 10 is a plan view of the stopper according to embodiment 3.

Fig. 11 is a partially enlarged view of the 1 st switching portion 60 in a state where the stopper 31b is attached.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and redundant description thereof is omitted. The dimensional proportions of the drawings are not necessarily in accordance with the objects of description. In the present specification, "upstream" and "downstream" refer to upstream and downstream in the traveling direction of the spun yarn 10 during spinning.

As shown in fig. 1, a spinning machine 1 includes a plurality of spinning units 2, a yarn joining cart 3, a doffing cart, a 1 st end side frame 4, and a 2 nd end side frame 5. The plurality of spinning units 2 are arranged in a row. Each spinning unit 2 generates spun yarn 10 and winds it into a package 45. In fig. 1, a winding package 45 in the form of a bobbin is wound on the spinning machine 1. When the spun yarn 10 is cut in a certain spinning unit 2 or the spun yarn 10 is broken due to some cause, the yarn joining cart 3 performs a yarn joining operation in the spinning unit 2. When the package 45 is fully wound in a certain spinning unit 2, the doffing cart replaces the package 45 and supplies a new bobbin 48 to the spinning unit 2. The 1 st end side frame 4 houses a recovery device for recovering lint, yarn ends, and the like generated in the spinning unit 2.

The 2 nd end side frame 5 houses: the air pressure of the compressed air (air) to be supplied to each part of the spinning machine 1 is adjusted to supply the air to the air supply part of each part, the driving motor for supplying power to each part of the spinning unit 2, and the like. The 2 nd end side frame 5 is provided with a machine control device and a touch panel (not shown). The machine control device performs centralized management and control of each part of the spinning machine 1. The touch panel can display information on the setting contents and/or the state of the spinning unit 2. The operator can perform the setting operation of the spinning unit 2 by performing an appropriate operation using the buttons displayed on the touch panel.

As shown in fig. 1 and 2, each spinning unit 2 includes, in order from the upstream side in the traveling direction of the spun yarn 10, a draft device 7, an air-jet spinning device 9, a clearer 52, a tension sensor, a yarn accumulating device 12, a waxing device, and a winding device 13. A unit controller 30 is provided for each predetermined number of spinning units 2 to control the operation of the spinning units 2.

The drafting device 7 drafts the fiber bundle (sliver) 8. The draft device 7 includes a rear roller pair 16, a third roller pair 17, a middle roller pair 19, and a front roller pair 20 in this order from the upstream side in the traveling direction of the fiber bundle 8. Each roller pair 16, 17, 19 and 20 has a bottom roller and a top roller. The bottom roller is rotated by a drive motor provided on the 2 nd end frame 5 or a drive motor provided on each spinning unit 2. A tangential belt 18 is arranged for the upper roller of the middle roller pair 19. The lower roller of the middle roller pair 19 is provided with a tangential belt 18.

The air-jet spinning device 9 twists the fiber bundle 8 drafted by the draft device 7 with a swirling air flow to generate a spun yarn 10. More specifically, the air-jet spinning device 9 includes a spinning chamber, a fiber guide section, a swirling-air-flow generating nozzle, and a hollow guide shaft body (not shown). The fiber guide section guides the fiber bundle 8 supplied from the draft device 7 on the upstream side into the spinning chamber. The swirling-flow generating nozzles are arranged around the traveling path of the fiber bundle 8. Air is ejected from a whirling airflow generating nozzle, thereby generating a whirling airflow in the spinning chamber. Due to this swirling airflow, each fiber end of the plurality of fibers constituting the fiber bundle 8 is reversed and swirled. The hollow guide shaft guides the spun yarn 10 from the spinning chamber to the outside of the air-jet spinning device 9.

The yarn clearer 52 monitors information on the spun yarn 10 traveling between the air-jet spinning device 9 and the yarn accumulating device 12, and detects the presence or absence of a yarn defect based on the monitored information. When detecting a yarn defect, the clearer 52 sends a detected yarn defect signal to the unit controller 30. The yarn clearer 52 detects, for example, a thickness abnormality of the spun yarn 10 and/or a foreign substance contained in the spun yarn 10 as a yarn defect. The clearer 52 also detects yarn breakage or the like. The tension sensor detects the tension of the spun yarn 10 traveling between the air-jet spinning device 9 and the yarn accumulating device 12, and sends a tension detection signal to the unit controller 30. When the unit controller 30 determines that there is an abnormality based on the detection result of the clearer 52 and/or the tension sensor, the spun yarn 10 is cut by the spinning unit 2. Specifically, the air supply to the air-jet spinning device 9 is stopped, and the spun yarn 10 is cut by interrupting the generation of the spun yarn 10. Alternatively, the spun yarn 10 may be cut by a cutter provided separately.

The waxing device waxes the spun yarn 10 between the yarn accumulating device 12 and the winding device 13.

The yarn accumulating device 12 accumulates the spun yarn 10 between the air-jet spinning device 9 and the winding device 13. The yarn accumulating device 12 includes a yarn accumulating roller 21, and accumulates the spun yarn 10 by winding the spun yarn 10 around the outer peripheral surface of the yarn accumulating roller 21. The yarn retention device 12 has the following functions: stably drawing out the spun yarn 10 from the air-jet spinning device 9; the spun yarn 10 fed out from the air-jet spinning device 9 is accumulated to prevent the spun yarn 10 from loosening, for example, when the yarn joining operation is performed by the yarn joining carriage 3; and preventing the tension variation of the spun yarn 10 on the downstream side of the yarn accumulating device 12 from being transmitted to the air-jet spinning device 9.

When the spun yarn 10 is cut at a certain spinning unit 2 or the spun yarn 10 is broken due to some cause, the yarn joining cart 3 moves to the spinning unit 2 and performs a yarn joining operation. The yarn joining cart 3 has a yarn joining device 43, a suction pipe 44, and a suction nozzle 46. The suction pipe 44 is rotatably supported by a support shaft, and catches the spun yarn 10 from the air-jet spinning device 9 and guides the same to the yarn joining device 43. The suction nozzle 46 is rotatably supported by a support shaft, and captures the spun yarn 10 from the winding device 13 and guides the same to the yarn joining device 43. The yarn joining device 43 joins the guided spun yarns 10. The yarn joining device 43 is a splicer using compressed air, a knotter mechanically joining the spun yarn 10, or the like.

When the yarn joining carriage 3 performs the yarn joining operation, the package 45 is rotated (reversed) in the opposite direction to the winding direction. At this time, the cradle arm 71 is moved by the 1 st switching unit 60 and the 2 nd switching unit 80 described later so as to separate the package 45 from the winding drum 91, and the package 45 is reversed by a reversing roller (not shown) provided on the yarn joining truck 3.

The winding device 13 winds the spun yarn 10 around the bobbin 48 to form a package 45. The winding device 13 includes a cradle arm 71, a winding drum 91, and a traverse guide 95. The rocker arm 71 rotatably supports the bobbin 48. The swing arm 71 is supported by the support shaft 70 so as to be swingable, and brings the surface of the bobbin 48 or the surface of the package 45 into contact with the surface of the winding drum 91 with an appropriate pressure. A driving motor (not shown) provided in the 2 nd end frame 5 drives the winding drums 91 of the plurality of spinning units 2 all at once. Thereby, in each spinning unit 2, the bobbin 48 or the package 45 is rotated in the winding direction. The traverse guide 95 of each spinning unit 2 is provided on a shaft body shared by the plurality of spinning units 2. The driving motor of the 2 nd end frame 5 reciprocally drives the shaft in the rotation axis direction of the winding drum 91, and the traverse guide 95 traverses the spun yarn 10 at a predetermined width with respect to the rotating bobbin 48 or package 45.

The winding device 13 will be described in detail with reference to fig. 4 and 5. The winding device 13 includes a cradle arm 71, a 1 st switching unit 60 (driving unit), a 2 nd switching unit 80, a winding drum 91, a traverse guide 95, and a unit controller 30 (see fig. 3). In fig. 4, the spinning machine 1 is shown winding a tapered package 45. The winding device 13 operates the 1 st switching unit 60 and the 2 nd switching unit 80 to move the boom arm 71 to the 1 st position and the 2 nd position, which are set in advance, respectively.

In the following description, a term including the concept of "up" or "down" may be used in the description of the positional relationship of the respective parts based on the vertical relationship of the rocker arm 71 in the state shown in fig. 5. In the explanation of the positional relationship of the respective parts, when a term including the concept of "front" and "rear" is used, the front side (left side in fig. 5) of the spinning machine 1 is referred to as "front", and the rear side (right side in fig. 5) of the spinning machine 1 is referred to as "rear". In addition, in the side view of the cradle arm 71 shown in fig. 5, the front side clamp arm 75a is not shown.

As shown in fig. 4 and 5, the cradle arm 71 is a portion that rotatably holds the package 45, and includes a fixed portion 73 fixed to the frame 6 and a rotating portion 75 rotatable forward and backward with respect to the fixed portion 73.

The fixing portion 73 is a portion fixed to the frame 6, and the frame 6 is positioned below the winding drum 91. Specifically, the fixing portion 73 is screwed to the frame 6 at a screw fixing portion 73a provided in the fixing portion 73.

A pair of rotating links 73d are provided at the lower end of a lower fixing portion 73b of the fixing portion 73 extending downward. The pair of rotating links 73d are connected to a rotating shaft 73c penetrating in the thickness direction (the arrangement direction of the spinning units 2) with the lower fixing portion 73b interposed therebetween. The one rotation link 73d includes a support portion 60a and a shaft member 74 to which a lower end of a 1 st switching portion 60, which will be described later, is attached. The 1 st switching portion 60 is attached to the shaft member 74 with the support portion 60a interposed therebetween by a stopper described later. The other rotation link 73d similarly has the shaft member 74, and is connected to a tip 82a of a piston rod 82 of a one-way driving cylinder 81 included in a 2 nd switching unit 80, which will be described later. The upper end of the lower fixing portion 73b is coupled to the upper end 81a of the housing of the unidirectional cylinder 81.

The rotating portion 75 is a portion supported to be rotatable about the support shaft 70 with respect to the fixed portion 73. The rotating portion 75 includes a main body portion 75f and two clamp arms (a clamp arm 75a and a clamp arm 75 b).

The body portion 75f is provided to be rotatable with respect to the support shaft 70 fixed to the fixing portion 73. In other words, the main body portion 75f is provided to be rotatable with respect to the frame 6. The distal end 61a of the piston rod 61 of the 1 st switching unit 60, which will be described later, is coupled to the rear end portion 75g of the main body 75f by a fastener such as a nut.

The 1 st switching unit 60 is a mechanism for bringing the rotating unit 75 of the cradle arm 71 holding the package 45 into proper contact with the winding drum 91. The 1 st switching unit 60 is constituted by a bidirectional pneumatic cylinder, and as shown in fig. 4, includes a piston rod 61, a piston 62 fixed to the piston rod 61, a pressure receiving port 63, a back pressure port 64, and an elevation port 68 as main components.

The 1 st switching unit 60 is configured to supply air from the pressure receiving port 63 and the back pressure port 64 into the casing of the 1 st switching unit 60. When there is a pressure difference between the air pressures of the air supplied to the pressure receiving port 63 and the back pressure port 64, the air pushes the piston 62 to drive the piston rod 61. When the piston rod 61 is pushed upward, the rear end portion 75g of the body portion 75f is lifted, the rotating portion 75 rotates about the support shaft 70 toward the front side (the left direction in fig. 5) of the spinning unit 2, and the package 45 moves in a direction away from the winding drum 91. On the other hand, when the piston rod 61 is pushed downward, the rear end portion 75g of the main body portion 75f is pulled downward, and the swing arm 71 is pivoted about the support shaft 70 toward the rear side (the right direction in fig. 5) of the spinning unit 2. Thereby, the package 45 is pressed against the winding drum 91. The pressure receiving port 63 is connected to a pressure receiving compressed air source 65 provided in the air box 4. The back pressure port 64 is connected to a pressure receiving compressed air source 65 via a pressure reducing valve 67.

The 1 st switching unit 60 moves the cradle arm 71 from the winding position, which is a position at which the spun yarn 10 is wound around the package 45, to the 1 st position, which is a position away from the winding position. In other words, the 1 st switching unit 60 moves the position of the package 45 from the winding position to the 1 st position.

Compressed air is supplied from the lift port 68 into the housing of the 1 st switching unit 60. The lift gate 68 is connected to a 1 st compressed air source 69. A lift port 68 is provided in addition to the back pressure port 64 to move the piston rod 61 slightly upward. A solenoid valve (not shown) is disposed between the elevation port 68 and the 1 st compressed air source 69, and whether or not compressed air is supplied to the elevation port 68 is controlled by the unit controller 30.

When the compressed air is supplied to the lift port 68, the piston rod 61 is slightly pushed upward, and the rear end portion 75g of the body portion 75f is slightly lifted. The grip arm 75a and the grip arm 75b slightly rotate toward the front side of the spinning unit 2 about the support shaft 70, and slightly separate the package 45 from the winding drum 91. Such movement of the swing arm 71 is used for fine adjustment of the winding speed of the spun yarn 10 and adjustment of the amount of the spun yarn 10 stored in the yarn storage device 12. When the 1 st switching unit 60 moves the swing arm 71 from the winding position to the 1 st position, the engagement between the traverse guide 95 and the spun yarn 10 is maintained. That is, the spun yarn 10 is wound into the package 45 while the spun yarn 10 is traversed by the traverse guide 95.

The 2 nd switching part 80 moves the rocker arm 71 from the winding position to the 2 nd position. The 2 nd position is a position farther from the winding position than the 1 st position. In other words, the 2 nd switching unit 80 moves the position of the package 45 from the winding position to the 2 nd position. As shown in fig. 4, the 2 nd switching unit 80 includes: a one-way driving cylinder 81 for moving the position of the rocker arm 71 from the winding position to the 2 nd position, and a spring 84 for moving the position of the rocker arm 71 from the 2 nd position to the winding position. The one-way cylinder 81 includes a piston rod 82, a piston 83 fixed to the piston rod 82, and a port 86 as main components. A solenoid valve (not shown) is disposed between the port 86 and the 2 nd compressed air source 89, and whether or not the air pressure is supplied to the port 86 is controlled by the unit controller 30.

Air is supplied from the port 86 into the casing of the one-way cylinder 81. When the compressed air is supplied to the port 86 and the piston rod 82 is drawn into the housing, the shaft member 74 rotates about the rotation shaft 73 c. Accordingly, the lower end of the housing of the 1 st switching part 60 is pushed up by the shaft member 74. Thereby, the 1 st switching part 60 is pushed up by a relatively large stroke as a whole. As a result, the rear end portion 75g of the main body portion 75f is lifted up with a relatively large stroke. The clamp arm 75a and the clamp arm 75b are largely rotated toward the front side (left direction in fig. 5) of the spinning unit 2 around the support shaft 70, and the package 45 and the winding drum 91 are largely separated from each other.

Such movement of the cradle arm 71 (package 45) by the 2 nd switching unit 80 is used at the time of yarn breakage and/or at the time of yarn splicing operation by the yarn splicing device 43. When the 2 nd switching unit 80 moves the carriage arm 71 from the winding position to the 2 nd position, the engagement between the traverse guide 95 and the spun yarn 10 is released. That is, since the spun yarn 10 is not traversed by the traverse guide 95, the package 45 is wound in a stripe shape.

Next, the stopper (engagement member) 31 of embodiment 1 will be described with reference to fig. 6a to 8. Fig. 6a and 6b are a plan view and a side view of the stopper 31 before being attached to the shaft member 74. Fig. 7 is a sectional view of the shaft member 74 to which the stopper 31 is attached. Fig. 8 is a partially enlarged view of the 1 st switching portion 60 in a state where the stopper 31 is attached. In fig. 6a, the up-down direction is referred to as the 1 st direction, the left-right direction is referred to as the 2 nd direction, and the direction orthogonal to both the 1 st direction and the 2 nd direction is referred to as the 3 rd direction.

The stopper 31 has: a circular engaging portion 32 engaging with an outer periphery of the shaft member 74, a 1 st connecting portion (connecting portion) 33 connected to one end portion of the engaging portion 32, a 2 nd connecting portion (connecting portion) 34 connected to the other end portion of the engaging portion 32, a 1 st handle (handle portion) 35 connected to the 1 st connecting portion 33 and pressed by a worker, and a 2 nd handle (handle portion) 36 connected to the 2 nd connecting portion 34 and pressed by the worker. The stopper 31 is formed by bending a metal wire rod having a diameter L2 of 1.2mm, which is formed of SW-C as one elastic member as a whole. This eliminates the need for a process for connecting the respective parts. The stopper 31 may have a value other than 1.2mm in L2. Further, it may be made of a material other than SW-C. In another example, not the entire stopper 31 may be formed of an elastic member. By elastically deforming at least a part of the members forming the stopper 31, the engaging portion 32 can be attached and detached and engaged with the shaft member 74. That is, a highly rigid material may be used in a part of the stopper 31.

As shown in fig. 6a, the engaging portion 32 is formed to have an inner diameter L1 on a plane formed by the 1 st direction and the 2 nd direction. The engagement portion 32 is formed to extend in a circular shape having a diameter L2 (radius R × 2). That is, as shown in fig. 7, the engaging portion 32 is formed to have a cross section having a diameter L2 on a plane formed by the 1 st direction and the 3 rd direction. The engaging portion 32 extends in the 1 st direction and the 2 nd direction and is bent so as to form a circular shape when viewed from the 3 rd direction.

When viewed from the 3 rd direction, the 1 st coupling part 33 and the 2 nd coupling part 34 partially intersect (intersect Q). When the operator presses the 1 st handle 35 and the 2 nd handle 36 in the 1 st direction toward each other, a part (elastic member) of the stopper 31 is deformed. Thereby, the engaging portion 32 expands in the radial direction, and the inner diameter of the engaging portion 32 at the time of local deformation of the stopper 31 becomes larger than the inner diameter L1 and the outer diameter L3 of the end portion of the shaft member 74 on the 3 rd direction side. When the worker releases the pressing of the 1 st and 2 nd grips 35 and 36, the stopper 31 is locally deformed and is intended to return to the original state shown in fig. 6a by the elastic force.

The 1 st handle 35 is bent in the 2 nd and 3 rd directions such that an end 37 of the 1 st handle 35 is close to the 2 nd handle 36 in the 1 st direction. The 2 nd handle 36 is bent in the 2 nd direction and the 3 rd direction such that the end 37 of the 2 nd handle is apart from the 1 st handle 35 in the 1 st direction. Since the 1 st and 2 nd grips 35 and 36 have a circular shape, the area of contact with the fingers of the operator can be increased, and the 1 st and 2 nd grips 35 and 36 can be easily pressed. Further, the structure of bending in the same direction can simplify the processing for forming the 1 st handle 35 and the 2 nd handle 36, and thus can suppress the manufacturing cost. The circular shape includes a shape with rounded corners having a circular arc shape in part.

As shown in fig. 7, the engaging portion 32 is attached to a groove (engaged portion) 38 formed on the outer periphery of the shaft member 74. The depth of the groove 38 in the 1 st direction in fig. 7 is equal to or greater than the radius R of the engaging portion 32. The depth of the groove 38 is 1.5 times or less the radius R of the engaging portion 32. The inner diameter L1 of the engaging portion 32 is smaller than or equal to the outer diameter L4 of the bottom of the groove 38. The length of the groove 38 in the 3 rd direction is equal to or greater than the diameter L2 of the engagement portion 32. Therefore, even if the cross section of the engaging portion 32 is circular with the radius R, the engaging portion 32 can be in contact with the wall of the groove 38 in parallel. That is, for example, a lower semicircle of a portion of the engaging portion 32 located on the upper side in the 1 st direction in fig. 7 (upper side in fig. 7) may not contact with the wall portion of the groove 38. Therefore, even if the 1 st switching portion 60 abuts against the engaging portion 32, the engaging portion 32 can be prevented from moving in the direction of coming out of the groove 38. Thus, the stopper 31 can be stably attached.

A method of attaching the stopper 31 when the 1 st switching part 60 is attached to the shaft member 74 will be described with reference to fig. 4 and 8. First, the 1 st switching part 60 is attached to the shaft member 74. At this time, the 1 st switching part 60 is pushed until the 1 st switching part 60 comes into contact with the support part 60 a. That is, the 1 st switching part 60 is installed inside the groove 38 formed in the shaft member 74 in the 3 rd direction.

Next, the operator presses the 1 st handle 35 and the 2 nd handle 36, and the inside diameter of the engaging portion 32 is increased, and the pressed portion is introduced into the shaft member 74 from the 3 rd direction. After the introduction, the operator releases the pressing of the 1 st handle 35 and the 2 nd handle 36, and the engagement portion 32 is restored to the original state. However, in a state where the engaging portion 32 abuts against the bottom of the groove 38 or the outer end of the groove 38, the inner diameter of the engaging portion 32 is larger than the inner diameter L1 in the original state. Therefore, the elastic force biases the engaging portion 32 in the inner diameter direction, and the engaging portion 32 is stably attached to the shaft member 74.

The 1 st grip 35 and the 2 nd grip 36 are located outside the lower end of the 1 st switching part 60 when attached to the shaft member 74 shown in fig. 8. That is, the length of the 1 st coupling part 33 and the 2 nd coupling part 34 in the 2 nd direction from the end of the engaging part 32 to the 1 st grip 35 and the 2 nd grip 36 in fig. 6a is larger than the shortest length from the groove 38 to the end of the 1 st switching part 60 in the radial direction of the shaft member 74. That is, the length of the coupling portion in the 2 nd direction is greater than the length from the engaged portion to the end of the switching portion near the engaged portion in the radial direction of the shaft member. As shown in fig. 4, the lower end of the 1 st switching part 60 is located below the upper end of the frame 6. Therefore, when the stopper 31 is attached, the operator performs the operation by extending his/her hand from the front side of the frame 6 over the upper portion of the frame 6. At this time, since the 1 st handle 35 and the 2 nd handle 36 are positioned outside the lower end of the 1 st switching part 60, the fingers of the operator pressing the 1 st handle 35 and the 2 nd handle 36 can be prevented from interfering with the 1 st switching part 60. Therefore, the operation of attaching and detaching the stopper 31 can be easily performed even in a place where the working space is small.

The intersection Q of the 1 st coupling part 33 and the 2 nd coupling part 34 is located at a position apart from the engaging part 32 in the 2 nd direction. And also separated from the end of the engaging portion 32. Therefore, the end of the engaging portion 32, the 1 st coupling portion 33, and the 2 nd coupling portion 34 can be prevented from overlapping in the 2 nd direction. This prevents the groove 38 from becoming longer in the 3 rd direction, and the engaging portion 32 can be stably attached. When the end portions of the engaging portion 32 overlap, the length of the groove 38 in the 3 rd direction needs to be 2 × L2 or more. However, for example, when the length of the groove 38 is 2 × L2, the diameter L2 of the engaging portion 32 is smaller than the length of the groove 38, that is, 2 × L2, at a portion other than the end portion of the engaging portion 32. Therefore, the engaging portion 32 cannot be stably attached to the shaft member 74. Further, the contact area with the wall surface of the groove 38 can be increased without overlapping the end of the engaging portion 32. Therefore, the engaging portion 32 can be stably attached to the shaft member 74 by positioning the intersection Q of the 1 st coupling portion 33 and the 2 nd coupling portion 34 at a position separated from the engaging portion 32 in the 2 nd direction and separating the end portions of the engaging portion 32.

Next, a stopper (engaging member) 31a according to embodiment 2 will be described with reference to fig. 9a and 9 b. The same or corresponding portions as those in embodiment 1 are denoted by the same reference numerals, and redundant description thereof is omitted. Fig. 9a and 9b are a perspective view and a plan view of the stopper 31a before being attached to the shaft member 74.

The stopper 31a includes: a pair of engaging portions 32 having a curved shape, a 1 st coupling portion 33 and a 2 nd coupling portion 34, a 3 rd handle (handle portion) 39 for a worker to hold by connecting the 1 st coupling portion 33 and the 2 nd coupling portion 34, and a pair of introduction portions 40 provided on the opposite side of the engaging portions 32 from the 1 st coupling portion 33 and the 2 nd coupling portion 34. The pair of engaging portions 32 and the pair of introducing portions 40 are provided on the same plane formed by the 1 st direction and the 2 nd direction.

The 3 rd handle 39 extends in the 3 rd direction. Therefore, the operator can perform the operation of attaching and detaching the stopper 31a by holding the 3 rd handle 39. The introduction portion 40 is separated from the engagement portion 32 as it is separated from it in the 2 nd direction. That is, the pair of introduction portions 40 are opened in a direction away from the engagement portion 32 in the 2 nd direction. The side of the pair of engaging portions 32 closer to the introduction portion 40 is inclined symmetrically to the pair of introduction portions 40 with respect to the 1 st direction. That is, the pair of engaging portions 32 are opened in a direction away from the introduction portion 40.

With this configuration, when the operator pushes the stopper 31a from between the pair of introduction portions 40 toward the groove 38 of the shaft member 74 while holding the 3 rd grip 39, the pair of engagement portions 32 are separated in the 1 st direction along the inclination direction of the introduction portions 40. When the stopper 31a is further pushed toward the groove 38, the distance separating the ends of the pair of introduction portions 40 on the opposite side to the opened side becomes equal to the outer diameter L4 of the bottom of the groove 38 or the outer diameter L3 of the end of the shaft member 74 on the 3 rd direction side. At this time, when the stopper 31a is further pushed toward the groove 38, the shaft member 74 can be positioned between the pair of engaging portions 32.

When the stopper 31a is to be detached from the shaft member 74, the stopper 31a is moved to the opposite side of the introduction portion 40 with respect to the 3 rd handle 39 in a state where the operator holds the 3 rd handle 39. Thus, the pair of engaging portions 32 are separated in the oblique direction of the engaging portions 32, and therefore the stopper 31a can be detached from the shaft member 74.

Unlike embodiment 1, the 3 rd knob 39 of embodiment 2 is not located outside the lower end of the 1 st switching part 60, but partially overlaps the lower end of the 1 st switching part 60 as viewed from the 3 rd direction. This is because: since the 3 rd handle 39 extends in the 3 rd direction, the fingers of the operator do not contact the lower end of the 1 st switching part 60 even if the operator grips the 3 rd handle 39. In another embodiment, the 3 rd handle 39 may be located outside the lower end of the 1 st switching part 60. In this way, since the operation of attaching and detaching the stopper 31a can be performed at a position apart from the 1 st switching unit 60, safety is improved.

Next, the stopper (engagement member) 31b according to embodiment 3 will be described with reference to fig. 10 and 11. The same or corresponding portions as those in embodiment 1 and embodiment 2 are denoted by the same reference numerals, and redundant description thereof is omitted. Fig. 10 is a plan view of the stopper 31b before being attached to the shaft member 74. Fig. 11 is a partially enlarged view of the 1 st switching portion 60 in a state where the stopper 31b is attached.

The stopper 31b includes: a linear 1 st engaging portion 32a extending in the 2 nd direction, a curved 2 nd engaging portion 32b curved in the 2 nd direction, a 1 st coupling portion 33 connected to one end of the 1 st engaging portion 32a, a 2 nd coupling portion 34 connected to one end of the 2 nd engaging portion 32b, a 3 rd handle (handle portion) 39a for a worker to hold by coupling the 1 st coupling portion 33 and the 2 nd coupling portion 34, a 1 st introduction portion 40a connected to the other end of the 1 st engaging portion 32a, and a 2 nd introduction portion 40b connected to the other end of the 2 nd engaging portion 32 b. The 1 st engaging portion 32a, the 2 nd engaging portion 32b, the 1 st introduction portion 40a, and the 2 nd introduction portion 40b are provided on the same plane constituted by the 1 st direction and the 2 nd direction.

The 1 st introduction portion 40a has a linear shape parallel to the 2 nd direction which is the extending direction of the 1 st engagement portion 32 a. The 2 nd introduction portion 40b extends in a direction intersecting the 1 st introduction portion 40 a. That is, the 1 st introduction portion 40a and the 2 nd introduction portion 40b are opened in a direction away from the 1 st engagement portion 32a and the 2 nd engagement portion 32 b.

Unlike embodiment 1 and embodiment 2, the shaft member 74 of embodiment 3 has a through hole 38a formed in a plane defined by the 1 st direction and the 2 nd direction, in which the groove 38 is formed in the front surface, instead of forming the groove 38.

With this configuration, when the operator pushes the stopper 31b toward the through hole 38a of the shaft member 74 with the 1 st introduction portion 40a inserted into the through hole 38a while holding the 3 rd grip 39a, the 2 nd engagement portion 32b is separated from the 1 st engagement portion 32a along the inclination direction of the 2 nd introduction portion 40 b. When the stopper 31b is further pushed toward the through hole 38a, the shaft member 74 can be positioned between the 1 st engaging portion 32a and the 2 nd engaging portion 32 b.

When the stopper 31b is to be detached from the shaft member 74, the stopper 31b can be detached by the operator moving the stopper 31b to the opposite side of the 1 st introduction portion 40a and the 2 nd introduction portion 40b with respect to the 3 rd handle 39a in a state where the operator holds the 3 rd handle 39a, as in the case of the 2 nd embodiment.

Unlike the embodiments 1 and 2, the stopper 31b of the embodiment 3 does not need to be biased in a direction toward the shaft member 74 side by elastic force when the stopper 31b is attached to the shaft member 74. This is because: the position of the stopper 31b in the 3 rd direction with respect to the shaft member 74 is defined by the through hole 38a and the 1 st engaging portion 32 a. The elastic force may be sufficient to prevent the 2 nd engaging portion 32b and the 1 st engaging portion 32a from being separated by the vibration of the 1 st switching portion 60 and the like.

Unlike embodiment 1, the 3 rd grip 39a of embodiment 3 is not located outside the lower end of the 1 st switching part 60 as a whole of the 3 rd grip 39a, and a part of the 3 rd grip 39a overlaps the lower end of the 1 st switching part 60 when viewed from the 3 rd direction. This is because: the 3 rd handle 39a has a curved shape, and thus, the fingers of the operator can be hooked from the side (3 rd direction). When the stopper 31b is attached to the shaft member 74, the 3 rd handle 39a may be gripped until the 1 st introduction portion 40a is inserted into the through hole 38a, and then the 3 rd handle 39a may be pushed forward. To remove the stopper 31b from the shaft member 74, the 3 rd handle 39a may be pulled by hooking a finger on the bent portion. In another embodiment, the 3 rd knob 39a may be located outside the lower end of the 1 st switching part 60. In this way, the mounting and dismounting work can be performed in a state where the 3 rd handle 39a is gripped, as in embodiment 1.

While the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

In the above embodiment, the draft device 7 has been described as an example including the rear roller pair 16, the third roller pair 17, the middle roller pair 19, and the front roller pair 20. However, the front roller pair (the roller pair disposed at the position closest to the air-jet spinning device 9 on the conveyance path of the fiber bundle 8) may be configured as a part of another device. For example, it may be: the spinning unit 2 includes a supply device that supplies the fiber bundle 8 drafted by the draft device 7 to the air-jet spinning device 9, and the front roller pair 20 is included in a part of the supply device. The front roller pair 20 may be included in the draft device 7 for drafting the fiber bundle 8 or the supply device for supplying the fiber bundle 8 to the air-jet spinning device 9, or may be provided separately from the other devices.

Instead of the draft device 7, a combing roller may be provided, and the air spinning device 9 may twist the fiber bundle supplied from the combing roller to generate the spun yarn 10.

Instead of the above configuration, the air-jet spinning device may be provided with a pair of air nozzles for twisting the fiber bundle in opposite directions.

Instead of the draft device 7 and the air spinning device 9, an open-end spinning device (rotor spinning device) may be provided in the spinning unit 2. An open-end spinning device is such a device: the fibers of the fiber bundle 8 are separated by a combing roller or an air flow, the separated fibers are conveyed into a spinning cup rotating at a high speed by the air flow, and the fibers are bundled by the inner wall of the spinning cup. The bundled fibers are pulled out from the open-end spinning device, thereby producing a spun yarn 10.

In the spinning unit 2, the yarn accumulating device 12 has a function of drawing the spun yarn 10 from the air-jet spinning device 9, but the spun yarn 10 may be drawn from the air-jet spinning device 9 by a delivery roller and a nip roller. When the spun yarn 10 is drawn out from the air-jet spinning device 9 by the delivery roller and the nip roller, a slackening tube using a suction air flow, a mechanical compensator, or the like may be provided instead of the yarn accumulating device 12.

In the spinning unit 2, instead of the configuration in which the yarn splicing device 43 connects the two yarn ends, the spun yarn 10 from the air-jet spinning device 9 and the spun yarn 10 from the package 45 may be connected (spliced) by inserting the spun yarn 10 from the package 45 into the air-jet spinning device 9, and starting the draft operation of the draft device 7 and the spinning operation of the air-jet spinning device 9.

In the spinning machine 1, each device is arranged to wind the spun yarn 10 supplied on the upper side on the lower side in the machine height direction. However, each device may be arranged to wind the yarn supplied on the lower side on the upper side.

In the spinning machine 1, at least one of the lower rollers of the draft device 7 and the traverse guide 95 are driven by power from the 2 nd end side frame 5 (that is, so as to be shared by the plurality of spinning units 2). However, each part of the spinning unit 2 (for example, the draft device, the spinning device, the winding device, and the like) may be driven independently for each spinning unit 2.

The tension sensor may be disposed upstream of the clearer 52 in the traveling direction of the spun yarn 10. The unit controller 30 may be provided for each spinning unit 2. In the spinning unit 2, the waxing device, the tension sensor, and the clearer 52 may be omitted. When the spun yarn 10 is not waxed, the waxing device may not be omitted, and only the wax may be removed from the waxing device.

In the winding apparatus 13 according to embodiments 1 to 3, the end of the upper portion 61a of the 1 st switching part 60 is attached by a fixing member, but may be attached by the stoppers 31, 31a, and 31b similarly to the lower end. In embodiments 1 to 3, the upper portion 61a is positioned above the frame 6, and therefore, the fixing tool can be attached and detached by an operator. However, since the upper portion 61a is also attached by the stoppers 31, 31a, and 31b as in the lower end, the attaching and detaching operation can be performed without using tools, and thus the operation efficiency can be improved.

In the winding apparatus 13 according to embodiments 1 to 3, the stoppers 31, 31a, and 31b are attached to the 1 st switching unit 60, but the 2 nd switching unit 80 may be attached by the stoppers 31, 31a, and 31b in the same manner. Thus, the 2 nd switching unit 80 can be easily attached and detached as well as the 1 st switching unit 60.

The engaging portions 32, 32a, and 32b in embodiments 1 to 3 are formed by curved lines, but may have other shapes. For example, the engaging portion 32 in embodiment 1 and embodiment 2 may be a square or a triangle when viewed from the 3 rd direction. The engaging portion 32 in embodiment 2 and the engaging portion 32b in embodiment 3 may be formed such that two straight lines are connected at an acute angle when viewed from the 3 rd direction.

In embodiment 1, the pair of end portions 37 of the stopper 31 are located on the same side in the 1 st direction as the 1 st handle 35 and the 2 nd handle 36, but may be provided at different positions. For example, the pair of end portions 37 may be disposed to face each other. That is, the pair of end portions 37 may be positioned inward in the 1 st direction. This prevents the pair of end portions 37 from hitting the fingers of the operator.

In embodiments 1 to 3, the stoppers 31, 31a, and 31b are formed of a single SW-C, but may be partially formed of another member. For example, the 1 st handle 35 and the 2 nd handle 36 may be attached with rubber members. This improves the operability of the operator.

In embodiment 1, the 1 st and 2 nd grips 35 and 36 have a circular shape, but may have other shapes. It can also be: for example, at least one of the 1 st handle 35 and the 2 nd handle 36 is an oval shape or a polygonal shape (e.g., a quadrangular shape) when viewed from the 1 st direction. That is, the structure may be configured to be pressed by a finger of an operator.

In embodiments 1 to 3, the engaging portions 32, 32a, and 32b are formed to extend in a circular cross section, but may have other shapes. For example, the cross section may be formed to extend in a quadrangular shape. In the case where the groove 38 has a square or rectangular cross section and is in surface contact with the bottom surface, the depth of the groove corresponding to the cross section may be eliminated. When the engaging portions 32, 32a, 32b are in surface contact with the bottom of the groove 38, the engaging portions 32, 32a, 32b are also in surface contact with the wall surface of the groove 38. Therefore, even if the engaging portions 32, 32a, 32b contact the 1 st switching portion 60, the engaging portions 32, 32a, 32b can be prevented from moving in the direction of disengaging from the groove 38. That is, in this case, the size of the cross section may be larger than the depth of the groove 38.

In embodiment 2, the 3 rd handle 39 extends in the 3 rd direction, but may extend in the 2 nd direction. Similarly, in embodiment 3, the 3 rd grip 39a extends in the 2 nd direction, but may extend in the 3 rd direction. That is, the structure may be configured to be held by the operator.

Claims (15)

1. An engaging member to be attached to a shaft member of a winding device for winding a spun yarn into a package,

the engaging member includes:

an engaging portion having a curved shape at least partially curved in a 1 st direction and extending in a 2 nd direction orthogonal to the 1 st direction;

a handle portion provided at a position apart from the engaging portion in the 2 nd direction; and

a pair of coupling portions extending in the 2 nd direction and coupling the engaging portion and the handle portion,

at least one of the engaging portion, the handle portion, and the connecting portion is formed of an elastic member.

2. The snap member according to claim 1,

the engaging portion, the handle portion, and the connecting portion are formed of one linear member.

3. The snap member according to claim 1,

the handle portion extends in a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction.

4. The snap member according to claim 2,

the handle portion extends in a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction.

5. The snap member according to claim 1,

the curved shape of the engaging portion is a circular shape.

6. The snap member according to claim 2,

the curved shape of the engaging portion is a circular shape.

7. The snap member according to claim 3,

the curved shape of the engaging portion is a circular shape.

8. The engaging member according to any one of claims 1 to 7,

the connecting part comprises a 1 st connecting part connected with one end of the clamping part and a 2 nd connecting part connected with the other end of the clamping part,

the 1 st coupling part and the 2 nd coupling part form an intersection when viewed from a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction.

9. The snap member according to claim 8,

the intersection is formed at a position separated from the engaging portion in the 2 nd direction.

10. The snap member according to claim 9,

both ends of the engaging portion are separated in the 2 nd direction.

11. The snap member according to claim 8,

the handle part comprises a 1 st handle part connected with the 1 st connecting part and a 2 nd handle part connected with the 2 nd connecting part,

the 1 st handle part and the 2 nd handle part are respectively at least partially in a circular arc shape, and an end of the 1 st handle part and an end of the 2 nd handle part are positioned on one side in the 1 st direction.

12. The snap-fit component according to claim 9 or 10,

the handle part comprises a 1 st handle part connected with the 1 st connecting part and a 2 nd handle part connected with the 2 nd connecting part,

the 1 st handle part and the 2 nd handle part are respectively at least partially in a circular arc shape, and an end of the 1 st handle part and an end of the 2 nd handle part are positioned on one side in the 1 st direction.

13. An engaging member to be attached to a shaft member of a winding device for winding a spun yarn into a package,

the engaging member includes:

an engaging portion having a curved shape on a plane formed by a 1 st direction and a 2 nd direction orthogonal to the 1 st direction;

a 1 st handle part and a 2 nd handle part which are provided at positions separated from the engaging part in the 2 nd direction;

a 1 st connecting portion connected to one end of the engaging portion and the 1 st handle portion; and

a 2 nd connecting portion connected to the other end of the engaging portion and the 2 nd handle portion,

at least one of the engaging portion, the handle portion, and the connecting portion is formed of an elastic member,

the engaging portion, the 1 st handle portion, the 2 nd handle portion, the 1 st connecting portion, and the 2 nd connecting portion are formed of one linear member,

the 1 st and 2 nd grip portions extend in a 3 rd direction orthogonal to both the 1 st and 2 nd directions,

the two ends of the clamping part are separated in the 2 nd direction,

an intersection is formed between the 1 st coupling part and the 2 nd coupling part when viewed from the 3 rd direction,

the intersection is formed at a position separated from the engaging portion in the 2 nd direction.

14. A take-up device, wherein,

the winding device comprises a winding part having the engaging member according to any one of claims 1 to 13,

the winding section includes: a shaft member having an engaged portion provided on one end side and engaged with the engaging portion, and a support portion provided on the other end side; a switching portion that turns around between the engaged portion and the support portion on the shaft member,

the length of the coupling portion in the 2 nd direction is greater than a length from the engaged portion to an end portion of the switching portion near the engaged portion in a radial direction of the shaft member.

15. The take-up apparatus according to claim 14,

the engaged portion is formed with a groove having a predetermined length in a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction,

the engaging portion is formed to extend in a circular cross section formed with a predetermined radius,

the groove has a length in the 3 rd direction that is greater than or equal to 2 times the radius of the engagement portion, and has a depth in a plane formed by the 1 st direction and the 2 nd direction that is greater than or equal to the radius and less than or equal to 1.5 times the radius.

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