JPH0729099Y2 - Support structure for thread feed roller - Google Patents

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a support structure for a yarn feed roller.

2. Description of the Related Art A yarn feeding roller used for spinning is usually supported by a rolling bearing. However, the friction torque of the bearing causes a slip between the roller and the yarn to deteriorate the quality of the yarn, There was a drawback that noise was generated because the sound was very loud. As a supporting structure for a yarn feeding roller which eliminates such a defect, there is a conventional structure shown in FIG. 2 (Japanese Patent Laid-Open No. 50-107234). In this support structure, a V-shaped dynamic pressure groove 25 is provided on the outer peripheral surface of a shaft 22 that supports the yarn feed roller 21, and the yarn feed roller 21 is radially moved by the dynamic pressure generated by the rotation of the yarn feed roller 21. On the other hand, the dynamic pressure grooves 26, 27 are provided on the side surface of the thread feeding roller 21 facing the side surfaces of the supporting members 23, 24 provided so as to sandwich the thread feeding roller 21 from the axial direction. The yarn feed roller 21 is supported in the axial direction by the dynamic pressure generated by the rotation of 21. Therefore, the friction torque acting on the yarn feeding roller 21 is small, slippage between the yarn and the yarn feeding roller 21 is reduced, and a high quality yarn can be obtained. In addition, the non-contact support significantly reduces noise.

[Problems to be solved by the device]

However, in the above-described conventional support structure for the yarn feed roller, since it is supported by the dynamic pressure, the dynamic pressure is not generated at the initial stage of rotation, the friction acting on the yarn feed roller 21 is large, and the yarn feed roller 21 and the yarn are prevented from moving. Problems such as slippage and poor thread quality, thread feed roller 21, shaft 22, and support members 23, 24
There is a problem that dust such as lint enters from the outside. Further, the yarn feeding roller 21 and the supporting members 23 and 24
If the gap between the and is not uniform, rotational runout will occur.Therefore, there is a problem that high precision machining is required for the side surface of the yarn feed roller and the locking member, and it is effective if the gap is too large. Since no dynamic pressure is generated, there is a problem that the clearance during assembly must be strictly controlled. Therefore, the object of the present invention is to prevent the slipping between the yarn feeding roller and the yarn from occurring, and prevent dust from entering from the outside. It is an object of the present invention to provide a support structure for a yarn feeding roller that does not require the management of

[Means for Solving the Problems]

In order to achieve the above object, the support structure of the yarn feeding roller of the present invention has an air hole for sending air toward the inner circumferential surface of the yarn feeding roller on the outer circumferential surface of the shaft supporting the yarn feeding roller. While supporting the yarn feeding roller in the radial direction, the side surface of the supporting portion provided so as to sandwich the yarn feeding roller from the axial direction, or the side surface of the yarn feeding roller facing the side surface of the supporting portion, A groove is formed whose inner end in the direction is opened in a gap formed between the yarn feeding roller and the shaft and whose outer end in the radial direction is closed to the outer side in the radial direction. The feature is that the roller is supported in the axial direction.

[Action]

In the above configuration, air is sent out from the air holes provided on the outer peripheral surface of the shaft toward the inner peripheral surface of the yarn feeding roller,
The yarn feed roller is supported in the radial direction by the static pressure generated between the yarn feed roller and the shaft, and the yarn feed roller is supported by the static pressure generated between the yarn feed roller and the support portion in the axial direction. Support in the direction. At this time, the air supplied from the air holes passes through the inside of the groove in the radial direction, and is supplied toward the opposite side surfaces at the radially outer end of the groove to form the surface throttle static pressure bearing, so that the axial direction The load volume of is increased. Therefore, even if the yarn hooking angle of the yarn with respect to the yarn feed roller changes and a large axial load is applied to the yarn feed roller, the yarn feed roller and the support portion do not come into contact with each other, and the rotational torque increases. There is no. Therefore, the friction torque acting on the yarn feeding roller is reduced not only during the rotation of the yarn feeding roller but also at the time of starting, the yarn does not slip, the yarn is improved in quality, and the noise is reduced. Further, since the internal pressure is larger than the external pressure, dust such as lint does not enter between the yarn feeding roller and the support portion from the outside. Also,
Since it is not necessary to generate dynamic pressure between the yarn feeding roller and the supporting portion, and since the groove is provided, there is always a supporting force by air in the axial direction, and it is not pressed to one side in the axial direction. Further, it is not necessary to improve the processing accuracy of the side surface of the yarn feeding roller and the supporting member, and it is not necessary to strictly manage the gap between the yarn feeding roller and the supporting member.

【Example】

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 is a sectional view of this embodiment, in which 1 is a yarn feeding roller,
Reference numeral 2 is a shaft for supporting the yarn feeding roller, and 3 and 4 are supporting members fitted to the shaft so as to sandwich the yarn feeding roller 1, respectively. The shaft 2 has an air hole 5 on its outer peripheral surface for sending air toward the inner peripheral surface of the yarn feeding roller 1. Further, the yarn feeding roller 1 has grooves 6 and 7 on the side surfaces facing the supporting members 3 and 4, respectively, having a depth dimension G larger than the interval ΔR between the supporting members 3 and 4. The grooves 6 and 7 are opened on the inner peripheral surface of the yarn feeding roller 1. More specifically, the radially inner ends of the grooves 6 and 7 open into a gap formed between the yarn feeding roller 1 and the shaft 2. On the other hand, these grooves
The radially outer ends of 6, 7 are closed to the radially outer side, as clearly shown in FIG. Therefore, the air sent out from the air hole 5 passes through the gap between the yarn feeding roller 1 and the shaft 2 through the grooves 6 and 7 and the gap between the yarn feeding roller 1 and the supporting members 3 and 4. Not only goes out to the outside, but also goes to the outside in the radial direction inside the grooves 6 and 7, and is supplied toward the side surfaces of the opposing support parts 3 and 4 at the closed radial outside end. . As a result, static pressure is generated between the yarn feeding roller 1 and the shaft 2 and between the yarn feeding roller 1 and the supporting members 3 and 4. The yarn feeding roller 1 is supported in the radial direction by the static pressure generated between the yarn feeding roller 1 and the axial direction by the static pressure generated between the yarn feeding roller 1 and the supporting members 3 and 4. As described above, since the yarn feeding roller 1 is supported by the static pressure in a non-contact state with the shaft 2 and the supporting members 3 and 4, the friction acting on the yarn feeding roller 1 not only at the time of rotation but also at the time of starting. Less torque, therefore no slippage of the thread,
The quality of the yarn can be improved and the noise is reduced. Further, since the internal pressure is larger than the external pressure, dust such as lint does not enter between the yarn feeding roller and the support portion from the outside. Further, since it is not necessary to generate a dynamic pressure between the yarn feeding roller and the supporting portion, it is not necessary to improve the processing accuracy of the side faces of the yarn feeding roller and the supporting member, and the gap between the yarn feeding roller and the supporting member is not increased. There is no need for strict management. Also, the groove 6,
Since 7 is provided, there is always a supporting force by air in the axial direction, and the yarn feeding roller 1 is not pressed to one side in the axial direction.

[Effect name of device]

As is clear from the above, the support structure of the yarn feeding roller of the present invention is provided with an air hole for sending air toward the inner peripheral surface of the yarn feeding roller on the outer peripheral surface of the shaft supporting the yarn feeding roller. On the side surface of the thread feeding roller that supports the thread feeding roller in the radial direction and that opposes the supporting portion that is provided so as to sandwich the thread feeding roller from the axial direction. A groove that opens in the gap formed between the feed roller and the shaft and has a radially outer end closed to the radially outer side is provided, and a part of the air supplied from the air hole is provided. , Without passing through the gap between the yarn feeding roller and the shaft to the outside in the radial direction, the groove is supplied toward the opposite side faces at the radially outer end portion, thereby providing a large axial load capacity. So that the thread feed roller is supported in the axial direction. That. Therefore, the friction torque acting on the yarn feeding roller is small not only at the time of rotation but also at the time of starting, so that the yarn does not slip. In addition, even when a large load is applied to the yarn feeding roller in the axial direction due to a change in the winding angle of the yarn with respect to the yarn feeding roller during rotation, the yarn feeding roller is pressed to one side in the axial direction and Therefore, the rotation torque does not increase due to the contact between the support portion and the support portion, and the frictional resistance between the yarn feeding roller and the yarn does not increase. Therefore, the quality of the yarn is not deteriorated and the yarn is not broken. Further, since slipping can be prevented even when a large load is applied in the axial direction as described above, it is not necessary to finely adjust the thread angle when hooking the thread on the thread feed roller, and therefore workability is improved. As a result, the operation rate of the yarn making machine is improved. Further, according to the present invention, the yarn feeding roller is supported by the static pressure in the radial direction and the axial direction, so that the noise is very small and the invasion of dust from the outside can be prevented. Further, unlike the support structure using dynamic pressure, the present invention does not need to improve the processing accuracy of the side surface of the yarn feed roller or the support member, and it is necessary to strictly manage the gap between the yarn feed roller and the support member. Absent.

[Brief description of drawings]

1 (a) is a sectional view showing an embodiment of the present invention, FIG. 1 (b) is a sectional view taken along the line I-I of FIG. 1 (a), and FIG. 2 is a sectional view showing a conventional example. . 1 ... Thread feed roller, 2 ... Shaft, 3, 4 ... Support member, 5
… Air holes, 6,7… grooves.

Claims (1)

[Scope of utility model registration request] 1. An outer peripheral surface of a shaft for supporting the yarn feeding roller is provided with an air hole for sending air toward an inner peripheral surface of the yarn feeding roller to support the yarn feeding roller in a radial direction. A side surface of the support portion provided so as to sandwich the thread feed roller from the axial direction, or a side surface of the thread feed roller facing the side surface of the support portion, and a radially inner end of the thread feed roller and the thread feed roller. A groove which is opened in a gap formed with the shaft and whose radial outer end is closed to the radial outer side is provided to support the yarn feeding roller in the axial direction. Support structure for the thread feed roller.