EP4782379A1

EP4782379A1 - Yarn feeding device

Info

Publication number: EP4782379A1
Application number: EP26152225.4A
Authority: EP
Inventors: Sho Kato; Shigeki Kitagawa; Hidekazu Chikada
Original assignee: TMT Machinery Inc
Current assignee: TMT Machinery Inc
Priority date: 2025-01-28
Filing date: 2026-01-16
Publication date: 2026-07-29
Also published as: CN122466599A; JP2026128303A

Abstract

To provide a yarn feeding device that suppresses vibration of a driven roller while yarn is running without compromising the function of pressing the driven roller against a drive roller with an appropriate contact pressure and a function of switching the posture of an arm during yarn threading or maintenance. A driven roller support mechanism 20 configured to support a driven roller 12 includes: an arm 30; a support 50 that rotatably supports the arm 30; a lever 70 configured to switch the posture of the arm 30; a biasing member 80 configured to bias the arm 30 and to be switched from a release posture PY3 to a pressing posture PX1 with the posture of the arm 30 being switched from a separated posture PB3 to a contact posture PA1; and an anti-vibration member 90 having a contact portion 95. In a state where the arm 30 is switched to the contact posture PA1, the biasing member 80 having been switched to the pressing posture PX1 presses the contact portion 95 of the anti-vibration member 90 against a contacted portion 35 to be contacted of the arm 30.

Description

TECHNICAL FIELD

The present invention relates to a yarn feeding device arranged in a yarn path of a textile machine.

BACKGROUND ART

Textile machines that perform various processes on yarns are known. In a false-twist machine described in Patent Document 1, raw yarn supplied to each spindle is processed into a false-twisted yarn by being twisted and heat-set with a false twister and a heater while being overfed or stretched between a yarn feeding device (roller group) on the upstream side and a yarn feeding device (roller group) on the downstream side.
Patent Document 2 discloses a yarn feeding device used in false-twist texturing machines and air texturing machines (for example, see FIG. 3). The yarn feeding device includes a drive roller and a driven roller. The driven roller is provided on an arm, and one end of the arm is rotatably connected to a support member. Between the arm and the support member, a coil spring is stretched.
When yarn is threaded on the yarn feeding device, the arm is rotated to separate the driven roller from the drive roller. After the yarn is passed between the drive roller and the driven roller, the arm is returned to its original posture, and the driven roller is brought into contact with the drive roller to nip the yarn. The coil spring biases the arm so as to press the driven roller against the drive roller, thereby generating a predetermined contact pressure.
Further, when maintenance is performed on the yarn feeding device, the arm is rotated to separate the driven roller from the drive roller. For example, when a worn driven roller is replaced, it is preferable to rotate the arm more than when yarn is threaded, and to perform replacement of the driven roller while a distance from other adjacent driven rollers is ensured.

CITATION LIST

PATENT DOCUMENTS

Patent Document 1: Japanese Unexamined Patent Publication No. H1-132843
Patent Document 2: Japanese Unexamined Patent Publication No. 2000-247539

SUMMARY OF THE INVENTION

TECHNICAL PROBLEM

In a traditional yarn feeding device, vibration occurred in the driven roller by making the yarn travel at a high speed, and along with this, there were cases where vibration also occurred in the arm. The vibrations of the driven roller and the arm include vibrations in the direction of approach and separation between the drive roller and the driven roller, that is, the direction of rotation of the arm. Therefore, as the vibration increases, the contact pressure between the driven roller and the drive roller may change, which may also affect the yarn quality.
To suppress the vibrations of the driven roller and the arm, one conceivable approach is to increase the biasing force of the coil spring. However, since the biasing force of the coil spring affects the contact pressure between the driven roller and the drive roller, the biasing force of the coil spring cannot be increased more than necessary.
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a yarn feeding device capable of suppressing vibration of the driven roller when yarn is travelling, without compromising a function of pressing the driven roller against the drive roller with an appropriate contact pressure and a function of switching the posture of the arm during yarn threading or maintenance.

SOLUTION TO THE PROBLEM

The present invention is configured as follows in order to solve the above problem. Namely, a yarn feeding device of the present invention is a yarn feeding device arranged in a yarn path of a textile machine, including: a plurality of drive rollers; a plurality of driven rollers each of which is paired with a corresponding one of the plurality of drive rollers; and a plurality of driven roller support mechanisms each of which is configured to support a corresponding one of the plurality of driven rollers, wherein each of the plurality of driven roller support mechanisms includes: an arm configured to support the corresponding driven roller; a support configured to rotatably support the arm; a lever configured to switch a posture of the arm between a contact posture in which the corresponding driven roller is in contact with the corresponding drive roller and a separated posture in which the corresponding driven roller is separated from the corresponding drive roller; a biasing member that is configured to bias the arm in a direction in which the corresponding driven roller is pressed against the corresponding drive roller in the contact posture and that is rotatably engaged with the support so that a posture of the biasing member is switched from a release posture to a pressing posture with switching of the posture of the arm from the separated posture to the contact posture; and an anti-vibration member having a contact portion arranged to face a contacted portion to be contacted provided on the arm in the contact posture, and in a state where the arm is switched to the contact posture, the biasing member having been switched to the pressing posture presses the contact portion of the anti-vibration member against the contacted portion of the arm (first configuration).
According to the above configuration, when the arm is switched from the separated posture to the contact posture, the posture of the biasing member is switched from the release posture to the pressing posture, and the biasing member presses the contact portion of the anti-vibration member against the contacted portion of the arm. When the contact portion of the anti-vibration member is pressed against the contacted portion of the arm, frictional resistance is generated between the anti-vibration member and the arm, thereby suppressing vibration of the arm caused by vibration of the driven roller. As a result, vibration of the driven roller can be suppressed through the arm. Further, the state where the contact portion of the anti-vibration member is pressed against the contacted portion of the arm is released when the posture of the arm is switched from the contact posture to the separated posture. Therefore, the function of pressing the driven roller against the drive roller with an appropriate contact pressure and the function of switching the posture of the arm during yarn threading or maintenance can be maintained, allowing for the suppression of vibration of the driven roller while the yarn is running.
Specific configurations of the yarn feeding device of the present invention include the following configurations. The first configuration may be such that
the arm has an accommodating portion configured to accommodate part of the anti-vibration member in the contact posture and having the contacted portion provided inside, and being rotatable in the separated posture to a position where the contact portion comes off from the accommodating portion; and the anti-vibration member is rotatably supported by the support and has a guide portion configured to guide the contact portion into inside of the accommodating portion when the arm is brought back from the separated posture to the contact posture (the second configuration).
According to the above configuration, the anti-vibration member is rotatably supported by the support. Therefore, the anti-vibration member does not hinder rotation of the arm when the posture of the arm is changed for yarn threading or maintenance. Further, when the arm is brought back from the separated posture to the contact posture, the guide portion provided on the anti-vibration member guides the contact portion of the anti-vibration member into inside of the accommodating portion. Therefore, when the arm is brought back from the separated posture to the contact posture, the anti-vibration member does not inadvertently come off from the accommodating portion, allowing for the suppression of vibrations in the driven roller and the arm while the yarn is running.
The second configuration may be such that in a state where the arm is switched to the separated posture, part of the guide portion is positioned inside the accommodating portion (the third configuration).
According to the above configuration, part of the guide portion of the anti-vibration member is positioned inside the accommodating portion in a state where the arm is switched from the contact posture to the separated posture. Therefore, when the arm is brought back from the separated posture to the contact posture, the contact portion of the anti-vibration member can be reliably guided into the inside of the accommodating portion, allowing for the suppression of vibrations of the driven roller and the arm while the yarn is running.
The second configuration may be such that in a state where the arm is switched to the separated posture, the guide portion comes off from the accommodating portion; and the anti-vibration member has a restriction portion configured to restrict the posture of the anti-vibration member so that the guide portion is positioned on a moving trajectory of the accommodating portion when the arm is brought back from the separated posture to the contact posture (the fourth configuration).
According to the above configuration, when the arm is brought back from the separated posture to the contact posture, the restriction portion of the anti-vibration member regulates the posture of the anti-vibration member so that the guide portion is positioned on the moving trajectory of the accommodating portion. Therefore, when the arm is brought back from the separated posture to the contact posture, the contact portion of the anti-vibration member can be reliably guided into the inside of the accommodating portion, allowing for the suppression of vibrations of the driven roller and the arm while the yarn is running. Further, when the posture of the arm is switched from the contact posture to the separated posture, the arm is largely rotated to the position where the guide portion of the anti-vibration member comes off from the accommodating portion of the arm, which facilitates maintenance and the like of the yarn feeding device.
The fourth configuration may be such that the restriction portion is formed to extend toward the biasing member and is engaged with the biasing member to restrict the posture of the anti-vibration member (the fifth configuration).
According to the above configuration, the restriction portion of the anti-vibration member is engaged with the biasing member. Therefore, when the arm is brought back from the separated posture to the contact posture, the posture of the anti-vibration member is restricted so that the guide portion of the anti-vibration member is positioned on the moving trajectory of the accommodating portion. Therefore, when the arm is brought back from the separated posture to the contact posture, the contact portion of the anti-vibration member can be reliably guided into the inside of the accommodating portion, allowing for the suppression of vibrations of the driven roller and the arm while the yarn is running.
The fourth configuration may be such that the restriction portion is formed to extend toward the support and contacts the support to restrict a swingable range with respect to the support (the sixth configuration).
According to the above configuration, the restriction portion of the anti-vibration member contacts the support body to restrict the swingable range of the anti-vibration member with respect to the support so that the guide portion of the anti-vibration member is positioned on the moving trajectory of the accommodating portion when the arm is brought back from the separated posture to the contact posture. Therefore, when the arm is brought back from the separated posture to the contact posture, the contact portion of the anti-vibration member can be reliably guided into the inside of the accommodating portion, allowing for the suppression of vibrations of the driven roller and the arm while the yarn is running.
Any one of the first to sixth configurations may be such that the anti-vibration member is rotatably supported with respect to the support by a rotation shaft that is the same as a rotation shaft of the biasing member, and has a pressed portion to be pressed by the biasing member, the pressed portion being provided on a side closer to the rotation shaft than the contact portion (the seventh configuration).
According to the above configuration, the anti-vibration member is rotatably supported with respect to the support, and has the pressed portion to be pressed by the biasing member, in a portion closer to the rotation shaft than the contact portion that contacts the arm. By pressing the pressed portion of the anti-vibration member at a position closer to the rotation shaft than a position farther from the rotation shaft, the biasing member is less likely to be deformed. Therefore, the anti-vibration member is reliably pressed by the biasing member to press the contact portion of the anti-vibration member against the contacted portion of the arm.
As a result, vibration of the driven roller and the arm when the yarn is running can be suppressed.

ADVANTAGES OF THE INVENTION

According to the yarn feeding device of the present invention, the vibration of the driven roller while yarn is running can be suppressed without compromising the function of pressing the driven roller against the drive roller with an appropriate contact pressure and the function of switching the posture of the arm during yarn threading or maintenance.

BRIEF DESCRIPTION OF THE DRAWINGS

[FIG. 1] FIG. 1 is a schematic configuration diagram of a false-twist machine to which a yarn feeding device according to an embodiment of the present invention is applied.
[FIG. 2] FIG. 2 is a front view showing a portion of the yarn feeding device.
[FIG. 3] FIG. 3 is a cross-sectional view taken along line A-A in FIG. 2.
[FIG. 4] FIG. 4 is a front view of a driven roller support mechanism.
[FIG. 5] FIG. 5 is a cross-sectional view of the driven roller support mechanism taken along line B-B in FIG. 4.
[FIG. 6] FIG. 6 is a cross-sectional view of the driven roller support mechanism in a state where the arm has been switched to a first separated posture.
[FIG. 7] FIG. 7 is a cross-sectional view of the driven roller support mechanism in a state where the arm has been switched to a second separated posture.
[FIG. 8] FIG. 8 is a cross-sectional view of the driven roller support mechanism in a state where the arm has been switched to a third separated posture.
[FIG. 9] FIGS. 9A to 9C are each a side view of the arm in a state where the posture of the arm is switched by operating a lever.
[FIG. 10] FIG. 10 is a cross-sectional view of the driven roller support mechanism in a case where no restriction portion is provided in the anti-vibration member.
[FIG. 11] FIGS. 11A and 11B are each a cross-sectional view of the driven roller support mechanism that constitutes a yarn feeding device according to a second embodiment of the present invention.
[FIG. 12] FIGS. 12A and 12B are each a cross-sectional view of the driven roller support mechanism that constitutes a yarn feeding device according to a third embodiment of the present invention.
[FIG. 13] FIG. 13 is a cross-sectional view of the driven roller support mechanism that constitutes a yarn feeding device according to a fourth embodiment of the present invention.
[FIG. 14] FIGS. 14A and 14B are each a cross-sectional view of the driven roller support mechanism that constitutes a yarn feeding device according to a fifth embodiment of the present invention.
[FIG. 15] FIGS. 15A and 15B are each a diagram illustrating another example of an anti-vibration member.

DESCRIPTION OF EMBODIMENTS

[First Embodiment]

A yarn feeding device 100 according to a first embodiment of the present invention will be described in detail below, with reference to the drawings. In the drawings, identical or corresponding parts are denoted by the same reference numerals, and the repeated description are omitted. For the sake of clarity of explanation, in the drawings referenced below, the configuration is shown in simplified or schematic form, or some components are omitted. The dimensional ratios between components shown in each drawing are not necessarily indicative of actual dimensional ratios.

(False-Twist Machine)

First, an example of a textile machine to which a yarn feeding device 100 is applied will be described. FIG. 1 is a schematic configuration diagram of a false-twist machine 200 to which the yarn feeding device 100 according to an embodiment of the present invention is applied. The false-twist machine 200 is a textile machine that false-twists a partially oriented yarn (POY) to produce a draw textured yarn (DTY).
The false-twist machine 200 includes a main base 212, a winding device 214, and a yarn feeding creel 216. The main base 212, the winding device 214, and the yarn feeding creel 216 are arranged in parallel at predetermined intervals in the widthwise direction (the direction D1 in FIG. 1) of the false-twist machine 200.
In the false-twist machine 200 shown in FIG. 1, the yarn feeding devices 100 are arranged at four positions along a yarn path 218 of the yarn Y. Where the yarn feeding devices 100 are referred to as a first yarn feeding device 101, a second yarn feeding device 102, a third yarn feeding device 103, and a fourth yarn feeding device 104 from the upstream side in the running direction of the yarn Y, the first yarn feeding device 101 is provided above the winding device 214. The second yarn feeding device 102 and the third yarn feeding device 103 are provided in an upper portion of the main base 212. The fourth yarn feeding device 104 is provided at a lower end portion of the main base 212. The first yarn feeding device 101 to the fourth yarn feeding device 104 are configured to feed multiple strands of yarn Y supplied from the yarn feeding creel 216 to the winding device 214.
Each of the first yarn feeding device 101 to the fourth yarn feeding device 104 includes a plurality of drive rollers 11 and driven rollers 12. The drive rollers 11 and the driven rollers 12 are arranged side by side in the left-right direction of the false-twist machine 200 (the direction D2 perpendicular to the plane of FIG. 1).
The multiple strands of yarn Y are supplied from the yarn feeding creel 216 to the first yarn feeding device 101. The multiple strands of yarn Y supplied to the first yarn feeding device 101 are fed to the second yarn feeding device 102 on the downstream side. The yarn feeding speed of the second yarn feeding device 102 is set to be higher than the yarn feeding speed of the first yarn feeding device 101. As a result, the yarn Y is stretched between the first yarn feeding device 101 and the second yarn feeding device 102.
Between the first yarn feeding device 101 and the second yarn feeding device 102, a first heater 220, a cooling device 222, and a false-twister 224 are provided from the upstream side to the downstream side in the running direction of the yarn Y. The yarn Y is false-twisted by the false-twister 224.
Between the third yarn feeding device 103 and the fourth yarn feeding device 104, a second heater 226 is provided. The strands of yarn Y having been combined between the second yarn feeding device 102 and the third yarn feeding device 103 are fed to the second heater 226 by the third yarn feeding device 103. The yarn Y is fed to the winding devices 214 by the fourth yarn feeding device 104, and is wound by the winding devices 214 to form a package P.

(Yarn Feeding Device)

Next, a configuration of the yarn feeding device 100 will be described in detail. The first yarn feeding device 101 to the fourth yarn feeding device 104 provided in the false-twist machine 200 have the same configuration. Therefore, the configuration of the yarn feeding device 100 will be described with reference to the first yarn feeding device 101.
FIG. 2 is a front view showing part of the yarn feeding device 100. FIG. 3 is a cross-sectional view taken along line A-A in FIG. 2. For the sake of convenience of explanation, an arrow U in the following drawings indicates the upward direction of the yarn feeding device 100, whereas an arrow D indicates the downward direction of the yarn feeding device 100. An arrow F indicates a forward direction of the yarn feeding device 100, whereas an arrow B indicates a rearward direction of the yarn feeding device 100. An arrow R indicates a rightward direction of the yarn feeding device 100, whereas an arrow L indicates a leftward direction of the yarn feeding device 100. The left-right direction of the yarn feeding device 100 coincides with the left-right direction of the false-twist machine 200 (direction D2 in FIG. 1), but the up-down direction of the yarn feeding device 100 and the up-down direction of the false-twist machine 200 do not necessarily coincide with each other.
As shown in FIG. 2, the yarn feeding device 100 includes a plurality of drive rollers 11, a plurality of driven rollers 12, and a plurality of driven roller support mechanisms 20. FIG. 2 shows only two sets of a drive roller 11, a driven roller 12, and a driven roller support mechanism 20, out of a plurality of such sets constituting the yarn feeding device 100.
The yarn feeding device 100 is fixed to a base 232 arranged in the left-right direction (direction D2 in FIG. 1) of the false-twist machine 200. The base 232 is a member that fixes the yarn feeding device 100 to the frame of the false-twist machine 200, and is formed by a tubular member having a substantially rectangular cross-sectional shape (see FIG. 3).
The drive rollers 11 are metal rollers and are attached to a common drive shaft 15. The drive shaft 15 is supported by the base 232 via a plurality of bearings 16. FIG. 2 only shows one bearing 16 out of the bearings 16 arranged along the length of the drive shaft 15.
At one end portion of the drive shaft 15, a drive device (not shown) is provided. Rotating the drive shaft 15 by the drive device rotates the drive rollers 11 at a predetermined rotation speed. Note that a cover (not shown) that covers the drive shaft 15 is provided between each of the bearings 16 and each of the drive rollers 11. The cover keeps the yarn Y from being unintentionally wound about the rotating drive shaft 15.
The driven rollers 12 are rubber rollers, and form pairs with the drive rollers 11. To each of the driven rollers 12, a driven shaft 17 is attached. The driven roller support mechanism 20 supports the driven shaft 17 in a cantilever manner, thereby supporting the driven roller 12 so that the driven roller 12 can be rotationally driven. The driven roller support mechanism 20 is fixed to the base 232 by a fixing bolt 58 (see FIG. 3).
As shown in FIG. 3, the driven roller support mechanism 20 supports the driven roller 12 so that the driven roller 12 can approach and separate from the drive roller 11. While the driven roller 12 is in contact with the drive roller 11, the drive roller 11 and the driven roller 12 sandwich the yarn Y, so that the yarn Y can be fed to the downstream side by the drive roller 11 which is rotationally driven and the driven roller 12 which is rotationally driven by the drive roller 11. During yarn threading or maintenance of the yarn feeding device 100, the driven roller 12 can be moved upward, to separate the driven roller 12 from the drive roller 11 (see FIGS. 6 to 8).
Note that, in FIG. 2, the driven roller support mechanism 20 (20R) on the right side supports the driven roller 12 in a cantilevered manner on the right side of the driven roller support mechanism 20 (20R). Further, the driven roller support mechanism 20 (20L) located on the left side supports the driven roller 12 in a cantilevered manner on the left side of the driven roller support mechanism 20 (20L). On the base 232, the right side driven roller support mechanism 20R and the left side driven roller support mechanism 20L are arranged adjacent to each other.
Although the right side driven roller support mechanism 20R and the left side driven roller support mechanism 20L are not of the same shape, they possess a similar configuration in terms of their mechanism. Therefore, the following will describe the configuration of the left side driven roller support mechanism 20L, while the description of the right side driven roller support mechanism 20R will be omitted. Further, the right side driven roller support mechanism 20R and the left side driven roller support mechanism 20L may be collectively referred to as the driven roller support mechanism 20, without distinction.

(Driven Roller Support Mechanism)

FIG. 4 is a front view of a driven roller support mechanism 20. FIG. 5 is a cross-sectional view of the driven roller support mechanism 20 taken along line B-B in FIG. 4. As shown in FIGS. 4 and 5, the driven roller support mechanism 20 has an arm 30, a support 50, a lever 70, a biasing member 80, and an anti-vibration member 90.
As shown in FIG. 5, the arm 30 supports the driven roller 12 at one end (front end) thereof. The other end (rear end) of the arm 30 is rotatably supported by the support 50 via an arm shaft 32. Rotating the arm 30 with respect to the support 50 allows switching between a posture that brings the driven roller 12 into contact with the drive roller 11 (contact posture PA1, FIG. 5), and a posture that separates the driven roller 12 from the drive roller 11 (first separated posture PB1, second separated posture PB2, third separated posture PB3, see FIGS. 6 to 8). The arm 30 is biased by the biasing member 80 in a direction in which the driven roller 12 is pressed against the drive roller 11.
On the front side of the arm 30, a driven shaft insertion portion 31 is formed. By inserting the driven shaft 17 of the driven roller 12 into the driven shaft insertion portion 31, the driven roller 12 is supported by the arm 30 in a cantilever manner. Note that the driven shaft 17 can be attached to and detached from the arm 30 by operating an attachment/detachment mechanism (not shown). The driven shaft 17 itself does not rotate with respect to the arm 30, and the driven roller 12 is rotatably supported via a bearing mounted on the driven shaft 17.
In a middle portion of the arm 30, an accommodating portion 34 is formed. The accommodating portion 34 is formed in the arm 30 as a recess opened at the lower side. The inner surfaces of the accommodating portion 34 include a front surface 35, a rear surface 36, an upper surface 37, and side surfaces 38. In FIG. 5, the left side surface 38, out of the side surfaces 38 formed on the left and right of the accommodating portion 34, is visible.
The accommodating portion 34 accommodates therein a portion of the biasing member 80 and the anti-vibration member 90, when the posture of the arm 30 is switched to the contact posture PA1. A lower surface of the front surface 35 serves as a contacted portion to be contacted with the anti-vibration member 90. The side surfaces 38 on the left and right of the accommodating portion 34 is provided with a lever shaft 74 and a penetration portion 40. The lever shaft 74 is a shaft that rotatably supports the lever 70 about the arm 30. The penetration portion 40 is an arc-shaped long hole, which is formed to curve upward about the lever shaft 74.
The support 50 is a member that rotatably supports the arm 30. The support 50 includes a support main body 51, a first support side portion 52, and a second support side portion 53 (see FIGS. 3 to 5).
The first support side portion 52 stands on the left side of the support main body 51, and the second support side portion 53 stands on the right side of the support main body 51. The first support side portion 52 and the second support side portion 53 stand substantially in parallel to each other with a spacing therebetween in the left-right direction. The rear end of the arm 30 is inserted between the first support side portion 52 and the second support side portion 53. The arm 30 is rotatably supported by the first support side portion 52 and the second support side portion 53 via the arm shaft 32.
As shown in FIGS. 4 and 5, a first distal end support 56 and a second distal end support 57 are formed at the front end of the support main body 51. The first distal end support 56 and the second distal end support 57 are formed to protrude forward from the support main body 51 with a spacing therebetween in the left-right direction. The first distal end support 56 and the second distal end support 57 support a rotation shaft 83. To the rotation shaft 83, one end (a lower end portion) of the biasing member 80 is engaged, and the anti-vibration member 90 is rotatably supported.
In the front portion and the rear portion of the support main body 51, a through hole 59 is formed. The support 50 is fixed to the base 232 by a fixing bolt 58 inserted into the through hole 59 (see FIG. 3).
The lever 70 is a part that is operated to switch the posture of the arm 30 between the contact posture PA1 and a separated posture (first separated posture PB1, second separated posture PB2, and third separated posture PB3). The lever 70 has an operation portion 71, a first lever side portion 72, and a second lever side portion 73 (see FIGS. 3 and 4). The lever 70 of the present embodiment is configured by coupling a left lever member 701 and a right lever member 702 with a bolt at a coupling portion 703.
The operation portion 71 is a part to be held by an operator to operate the lever 70. The first lever side portion 72 is formed to protrude downward on the left side of the operation portion 71, and the second lever side portion 73 is formed to protrude downward on the right side of the operation portion 71 (see FIG. 4). The first lever side portion 72 and the second lever side portion 73 are formed substantially in parallel to each other with a spacing therebetween in the left-right direction. The lever 70 is arranged to straddle an upper portion of the arm 30, and the upper portion of the arm 30 is inserted between the first lever side portion 72 and the second lever side portion 73.
As shown in FIGS. 3 to 5, the first lever side portion 72 and the second lever side portion 73 are rotatably attached to the arm 30 through the lever shaft 74. The lever shaft 74 does not penetrate the accommodating portion 34 of the arm 30 in order to avoid interference with the biasing member 80 accommodated in the accommodating portion 34, and is provided on the left side surface 38 and the right side surface 38 of the arm 30.
The first lever side portion 72 and the second lever side portion 73 are provided with an engaging shaft 75. The engaging shaft 75 is inserted through the penetration portion 40 of the arm 30 and penetrates the accommodating portion 34 of the arm 30. Both ends of the engaging shaft 75 are supported by the first lever side portion 72 and the second lever side portion 73. To the engaging shaft 75, the other end (upper end) of the biasing member 80 is engaged.
As shown in FIG. 3, a first end surface portion 731, a second end surface portion 732, a third end surface portion 733, and a fourth end surface portion 734 are formed in the peripheral portion of the second lever side portion 73. The first end surface portion 731, the second end surface portion 732, the third end surface portion 733, and the fourth end surface portion 734 are each formed in a linear shape in a side view. The distances from the lever shaft 74 to the end surface portions are set such that the distance to the first end surface portion 731 is the shortest, the distance to the second end surface portion 732 is longer than that to the first end surface portion 731, the distance to the third end surface portion 733 is longer than that to the second end surface portion 732, and the distance to the fourth end surface portion 734 is the longest. Further, portions connecting the end surface portions are formed in a substantially smooth arc shape in a side view.
As shown in FIG. 5, the biasing member 80 is a member that biases the arm 30 in a direction to press the driven roller 12 against the drive roller 11. In the present embodiment, a coil spring is used as the biasing member 80. At both ends of the biasing member 80, curved hooks 81 are formed. The hook 81 at the lower end of the biasing member 80 is rotatably engaged with the rotation shaft 83 provided at a front portion of the support main body 51. The hook 81 at the upper end of the biasing member 80 is engaged with the engaging shaft 75 provided on the lever 70.
The anti-vibration member 90 is a member that suppresses vibration of the arm 30 and the driven roller 12 by generating frictional resistance between the anti-vibration member 90 and the arm 30. The anti-vibration member 90 has an anti-vibration main body 91, a rotation support 92, a guide portion 93, a contact portion 95, a pressed portion 96, and a restriction portion 97. The anti-vibration member 90 is formed of, for example, a hard synthetic resin material or the like.
The anti-vibration main body 91 is a member with a substantially square cross-sectional shape. At the lower end portion of the anti-vibration main body 91, the rotation support 92 is formed. The rotation support 92 is rotatably supported by the rotation shaft 83 provided at the support main body 51. The rotation support 92 is provided with a slit portion 921 having a width extending in the left-right direction, so as not to interfere with the hook 81 of the biasing member 80 engaged with the rotation shaft 83. The rotation support 92 is formed to extend forward in a side view, and the anti-vibration main body 91 is formed to extend obliquely upward with respect to the rotation support 92.
The guide portion 93 is formed at the upper part of the anti-vibration main body 91. The guide portion 93 guides the anti-vibration main body 91 to be smoothly accommodated in the accommodating portion 34 of the arm 30 when the posture of the arm 30 is returned from the separated posture (first separated posture PB1, second separated posture PB2, and third separated posture PB3) to the contact posture PA1. On the front surface side of the guide portion 93, an inclined surface is formed to facilitate guiding of the anti-vibration main body 91 into inside of the accommodating portion 34.
The contact portion 95 is a part that, when the posture of the arm 30 is switched to the contact posture PA1, comes into contact with the arm 30 (a front surface 35 of the accommodating portion 34) to generate frictional resistance between the contact portion 95 and the arm 30. In the present embodiment, the contact portion 95 is formed below the guide portion 93 and on the front surface of the anti-vibration member 90. Further, the position of the contact portion 95 is set such that, when the arm 30 is switched to the contact posture PA1, the contact portion 95 is accommodated in the accommodating portion 34 of the arm 30 and faces the front surface 35 of the accommodating portion 34.
The pressed portion 96 is a part that is pressed by the biasing member 80. The pressed portion 96 is formed to protrude toward the biasing member 80. As the pressed portion 96 is pressed by the biasing member 80, the anti-vibration member 90 is biased to rotate forward, and the contact portion 95 is pressed against the front surface 35 of the accommodating portion 34 of the arm 30.
The restriction portion 97 is a member that regulates the posture of the anti-vibration member 90 by being engaged with the biasing member 80. The restriction portion 97 of the present embodiment extends from the left side of the anti-vibration main body 91 toward the biasing member 80, and is formed such that its distal end portion is curved rightward. The restriction portion 97 is attached to embrace the lower portion of the biasing member 80. As a result, the anti-vibration member 90 rotates according to a change in the posture of the biasing member 80, and the change in the posture of the anti-vibration member 90 is restricted by the biasing member 80 to a certain range of the change in the posture.

(Switching of Arm Posture by Operation of Lever)

Next, with reference to FIG. 3 and FIG. 9, switching of the posture of the arm 30 by operating the lever 70 will be described. FIG. 9 is a side view showing a state where the posture of the arm 30 is switched by operating a lever 70. FIG. 9A shows a state where the arm 30 is switched to the first separated posture PB1. FIG. 9B shows a state where the arm 30 is switched to the second separated posture PB2. FIG. 9C shows a state where the arm 30 is switched to the third separated posture PB3.
In FIG. 3, the driven roller 12 is in contact with the drive roller 11, and the arm 30 is in the contact posture PA1. The posture of the lever 70 when the posture of the arm 30 is switched to the contact posture PA1 is referred to as the first operation posture PC1. In the first operation posture PC1, the operation portion 71 of the lever 70 is positioned forward relative to the lever shaft 74. In the first operation posture PC1, the first end surface portion 731 of the second lever side portion 73 faces the upper surface of the second support side portion 53 of the support 50, but is not in contact with the second support side portion 53. As a result, the arm 30 is biased downward by the biasing member 80, and the driven roller 12 is in a state where a predetermined contact pressure is applied to the drive roller 11.
The driven roller 12 is separated from the drive roller 11 in any of FIGS. 9A to 9C. The height of the driven roller 12 with respect to the drive roller 11 (rotational angle of the arm 30) is the lowest in the first separated posture PB1 and the highest in the third separated posture PB3. Further, the second separated posture PB2 is between the first separated posture PB1 and the third separated posture PB3. The first separated posture PB1 is a posture taken when yarn Y is threaded between the drive roller 11 and the driven roller 12. The second separated posture PB2 is the posture taken when the yarn feeding device 100 is halted or when the maintenance or the like is performed. The third separated posture PB3 is a posture taken when the maintenance such as the replacement of the driven roller 12 is performed.
The posture of the lever 70 when the arm 30 is switched to the first separated posture PB1, as shown in FIG. 9A, is referred to as a second operation posture PC2. In the second operation posture PC2, the operation portion 71 of the lever 70 is positioned obliquely forward relative to the lever shaft 74. In the second operation posture PC2, the second end surface portion 732 of the second lever side portion 73 is in contact with the upper surface of the second support side portion 53 of the support 50. As a result, the arm 30 is rotated and lifted upward against the biasing force of the biasing member 80, thereby switching the arm 30 to the first separated posture PB1.
The posture of the lever 70 when the arm 30 is switched to the second separated posture PB2, as shown in FIG. 9B, is referred to as a third operation posture PC3. In the third operation posture PC3, the operation portion 71 of the lever 70 is positioned obliquely backward relative to the lever shaft 74. In the third operation posture PC3, the third end surface portion 733 of the second lever side portion 73 is in contact with the upper surface of the second support side portion 53 of the support 50. As a result, the arm 30 is rotated and lifted further upward than the first separated posture PB1 against the biasing force of the biasing member 80, thereby switching the arm 30 to the second separated posture PB2.
The posture of the lever 70 when the arm 30 is switched to the third separated posture PB3, as shown in FIG. 9C, is referred to as a fourth operation posture PC4. In the fourth operation posture PC4, the operation portion 71 of the lever 70 is positioned to the rear relative to the lever shaft 74. In the fourth operation posture PC4, the fourth end surface portion 734 of the second lever side portion 73 is in contact with the upper surface of the second support side portion 53 of the support 50. As a result, the arm 30 is rotated and lifted further upward than the second separated posture PB2 against the biasing force of the biasing member 80, thereby switching the arm 30 to the third separated posture PB3.

(Change in Postures of Biasing Member and Anti-Vibration Member)

Next, changes in the posture of the biasing member 80 and the anti-vibration member 90 when the posture of the arm 30 is switched will be described with reference to FIGS. 5 to 8. FIG. 5 is a cross-sectional view of the driven roller support mechanism 20 in a state where the arm 30 is switched to the contact posture PA1. FIG. 6 is a cross-sectional view of the driven roller support mechanism 20 in a state where the arm 30 is switched to the first separated posture PB1. FIG. 7 is a cross-sectional view of the driven roller support mechanism 20 in a state where the arm 30 is switched to the second separated posture PB2. FIG. 8 is a cross-sectional view of the driven roller support mechanism 20 in a state where the arm 30 is switched to the third separated posture PB3.
In FIG. 5, the arm 30 is switched to the contact posture PA1 by switching the lever 70 to the first operation posture PC1. When the lever 70 is switched to the first operation posture PC1, the engaging shaft 75 on the lever 70 moves to the front end position of the penetration portion 40. As a result, the biasing member 80 engaged with the engaging shaft 75 is switched to a posture inclined forward. This posture is referred to as a pressing posture PX1.
The biasing member 80 having been switched to the pressing posture PX1 presses forward the pressed portion 96 of the anti-vibration member 90. When the pressed portion 96 is pressed forward, the anti-vibration member 90 is biased to rotate forward, and the contact portion 95 is pressed against the front surface 35 of the accommodating portion 34. As a result, frictional resistance is generated between the contact portion 95 and the arm 30, allowing the anti-vibration member 90 to suppress the vibration that occurs in the arm 30 and the driven roller 12 while the yarn Y is running.
In FIG. 6, the arm 30 is switched to the first separated posture PB1 by switching the lever 70 to the second operation posture PC2. When the lever 70 is switched to the second operation posture PC2, the engaging shaft 75 on the lever 70 moves to an intermediate position of the penetration portion 40. As a result, the biasing member 80 engaged with the engaging shaft 75 is switched to a posture closer to upright than the pressing posture PX1. This posture is referred to as a first release posture PY1.
The biasing member 80 having been switched to the first release posture PY1 is separated from the pressed portion 96 of the anti-vibration member 90, and therefore does not press the pressed portion 96. That is, when the posture of the arm 30 is switched from the contact posture PA1 to the first separated posture PB1, the biasing of the anti-vibration member 90 by the biasing member 80 is released, and the contact portion 95 of the anti-vibration member 90 is separated from the front surface 35 of the accommodating portion 34 of the arm 30.
Further, since the restriction portion 97 of the anti-vibration member 90 is engaged with the biasing member 80, the posture of the anti-vibration member 90 changes with a change in the posture of the biasing member 80. In FIG. 6, the posture of the anti-vibration member 90 is switched to a substantially upright posture, similarly to the biasing member 80. Further, in FIG. 6, the guide portion 93 and the contact portion 95 of the anti-vibration member 90 are positioned inside the accommodating portion 34 of the arm 30.
In FIG. 7, the arm 30 is switched to the second separated posture PB2 by switching the lever 70 to the third operation posture PC3. When the lever 70 is switched to the third operation posture PC3, the engaging shaft 75 on the lever 70 moves to a position further rearward than the intermediate position of the penetration portion 40 shown in FIG. 6. As a result, the biasing member 80 engaged with the engaging shaft 75 is switched to a posture inclined further rearward than the first release posture PY1. This posture is referred to as a second release posture PY2.
The biasing member 80 having been switched to the second release posture PY2 is separated from the pressed portion 96 of the anti-vibration member 90, and therefore the state of not pressing the pressed portion 96 is maintained. Further, since the restriction portion 97 of the anti-vibration member 90 is engaged with the biasing member 80, the posture of the anti-vibration member 90 changes with a change in the posture of the biasing member 80. In FIG. 7, the anti-vibration member 90 is switched to a posture that is slightly inclined rearward, similarly to the biasing member 80. Further, in FIG. 7, the contact portion 95 of the anti-vibration member 90 comes off from the accommodating portion 34 of the arm 30, but the guide portion 93 is positioned inside the accommodating portion 34.
In FIG. 8, the arm 30 is switched to the third separated posture PB3 by switching the lever 70 to the fourth operation posture PC4. When the lever 70 is switched to the fourth operation posture PC4, the engaging shaft 75 on the lever 70 moves to the rear end position of the penetration portion 40. As a result, the biasing member 80 engaged with the engaging shaft 75 is switched to a posture inclined further rearward than the second release posture PY2. This posture is referred to as a third release posture PY3.
The biasing member 80 having been switched to the third release posture PY3 is separated from the pressed portion 96 of the anti-vibration member 90, and therefore the state of not pressing the pressed portion 96 is maintained. Further, since the restriction portion 97 of the anti-vibration member 90 is engaged with the biasing member 80, the posture of the anti-vibration member 90 changes with a change in the posture of the biasing member 80. In FIG. 8, the anti-vibration member 90 is switched to a posture that is slightly inclined rearward, similarly to the biasing member 80. Further, in FIG. 8, both the contact portion 95 and the guide portion 93 of the anti-vibration member 90 come off from the accommodating portion 34 of the arm 30.
Next, the following describes a case of bringing the arm 30, which has been switched to the third separated posture PB3, back to the contact posture PA1, through the second separated posture PB2 and the first separated posture PB1.
By switching the posture of the lever 70 from the fourth operation posture PC4 to the first operation posture PC1 through the third operation posture PC3 and the second operation posture PC2, the posture of the arm 30 is switched back from the third separated posture PB3 to the contact posture PA1, through the second separated posture PB2 and the first separated posture PB1.
At this time, the posture of the biasing member 80 is also switched from the third release posture PY3 to the pressing posture PX1 through the second release posture PY2 and the first release posture PY1. Since the restriction portion 97 is engaged with the biasing member 80, the posture of the anti-vibration member 90 also changes with a change in the posture of the biasing member 80. At this time, the anti-vibration member 90 is always positioned inside the virtual line AR1 shown in FIG. 8, which indicates the moving trajectory of the accommodating portion 34. That is, the anti-vibration member 90 is always positioned on the moving trajectory of the accommodating portion 34.
Therefore, when the arm 30 is largely rotated to switch to the third separated posture PB3, the contact portion 95 and the guide portion 93 of the anti-vibration member 90 come off from the accommodating portion 34 of the arm 30. When the arm 30 is brought back to the contact posture PA1, the anti-vibration member 90 is reliably guided inside the accommodating portion 34 of the arm 30. As a result, in a state where the arm 30 is brought back to the contact posture PA1, the contact portion 95 of the anti-vibration member 90 is reliably pressed against the inside of the accommodating portion 34, allowing for the suppression of vibrations in the driven roller 12 and the arm 30 while the yarn is running.
Here, with reference to FIG. 10, the following describes a case of not providing the restriction portion 97 of the anti-vibration member 90, unlike the present embodiment. FIG. 10 is a cross-sectional view of a driven roller support mechanism 320 in a case where no restriction portion is provided in an anti-vibration member 390. Except for the anti-vibration member 390, the configuration is assumed to be the same as the driven roller support mechanism 20 described above.
FIG. 10 shows a state where the arm 30, which has been switched to the third separated posture PB3 (solid line), has been brought back to the second separated posture PB2 (virtual line) in order to return to the contact posture PA1. Since the anti-vibration member 390 does not have a restriction portion, the posture of the anti-vibration member 390 is not restricted by the biasing member 80. Therefore, when the guide portion 393 of the anti-vibration member 390 comes off from the accommodating portion 34 of arm 30, as in the third separated posture PB3, the anti-vibration member 390 can rotate freely and may rotate outward beyond the virtual line AR1 that indicates the moving trajectory of the accommodating portion 34.
When the arm 30, during this state, is brought back to the second separated posture PB2 (virtual line), the distal end portion of the guide portion 393 of the anti-vibration member 390 contacts the outside of the accommodating portion 34 of the arm 30, and therefore the anti-vibration member 390 cannot be guided into the inside of the accommodating portion 34 of the arm 30.
To avoid this state, the rotatable range of the arm 30 may be restricted to be equal to or smaller than the second separated posture PB2 so that the guide portion 393 of the anti-vibration member 390 does not come off from the accommodating portion 34 of the arm 30. In this case, even without providing a restriction portion to the anti-vibration member 390, the function of pressing the driven roller 12 against the drive roller 11 with an appropriate contact pressure and the function of switching the posture of the arm 30 during yarn threading can be maintained, allowing for the suppression of vibration of the driven roller 12 while the yarn is running. However, if the rotatable range of the arm 30 is restricted to be equal to or smaller than the second separated posture PB2, the arm 30 cannot be rotated to a sufficient height necessary for maintenance or the like.
In the present embodiment, on the other hand, the posture of the anti-vibration member 90 is restricted by the restriction portion 97. As a result, when the arm 30 is largely rotated to switch to the third separated posture PB3, the contact portion 95 and the guide portion 93 of the anti-vibration member 90 come off from the accommodating portion 34 of the arm 30. However, when the arm 30 is brought back to the contact posture PA1, the anti-vibration member 90 can be reliably guided inside the accommodating portion 34 of the arm 30. Therefore, the arm 30 can be rotated to a sufficient height for maintenance or the like.
With the yarn feeding device 100 of the present embodiment described above, switching the posture of the arm 30 from the third separated posture PB3 to the contact posture PA1 switches the posture of the biasing member 80 from the third release posture PY3 to the pressing posture PX1, thus causing the biasing member 80 to press the contact portion 95 of the anti-vibration member 90 against the accommodating portion 34 of the arm 30. When the contact portion 95 of the anti-vibration member 90 is pressed against the accommodating portion 34 of the arm 30, frictional resistance is generated between the anti-vibration member 90 and the arm 30, thereby suppressing vibration of the arm 30 caused by vibration of the driven roller 12. As a result, vibration of the driven roller 12 can be suppressed through the arm 30. Further, the state where the contact portion 95 of the anti-vibration member 90 is pressed against the accommodating portion 34 of the arm 30 is released when the posture of the arm 30 is switched from the contact posture PA1 to the first separated posture PB1. Therefore, the function of pressing the driven roller 12 against the drive roller 11 with an appropriate contact pressure and the function of switching the posture of the arm 30 during yarn threading or maintenance can be maintained, allowing for the suppression of vibration of the driven roller 12 while the yarn is running.
Since the restriction portion 97 of the anti-vibration member 90 is engaged with the biasing member 80, the posture of the anti-vibration member 90 is restricted so that the guide portion 93 of the anti-vibration member 90 is positioned inside the moving trajectory of the accommodating portion 34 (inside the virtual line AR1 indicating the moving trajectory of the accommodating portion 34) when the arm 30 is brought back from the third separated posture PB3 to the contact posture PA1. Therefore, when the arm 30 is brough back from the third separated posture PB3 to the contact posture PA1, the contact portion 95 of the anti-vibration member 90 can be reliably guided into the inside of the accommodating portion 34, allowing for the suppression of vibrations in the driven roller 12 and the arm 30 while the yarn is running.
Further, when the posture of the arm 30 is switched from the contact posture PA1 to the third separated posture PB3, the arm 30 is largely rotated to the position where the guide portion 93 of the anti-vibration member 90 comes off from the accommodating portion 34 of the arm 30, which facilitates maintenance and the like of the yarn feeding device 100.
Further, the anti-vibration member 90 is rotatably supported by the rotation shaft 83 so as to be rotatable with respect to the support 50, and has the pressed portion 96 to be pressed by the biasing member 80, in a portion closer to the rotation shaft 83 than the contact portion 95 that contacts the arm 30. By pressing the pressed portion 96 of the anti-vibration member 90 at a position closer to the rotation shaft 83 than a position farther from the rotation shaft 83, the biasing member 80 is less likely to be deformed. Therefore, the anti-vibration member 90 is reliably pressed by the biasing member 80 to press the contact portion 95 of the anti-vibration member 90 against the accommodating portion 34 of the arm 30. As a result, vibration of the driven roller 12 and the arm 30 when the yarn is running can be suppressed.

[Second Embodiment]

Next, the following describes a yarn feeding device 100A according to a second embodiment of the present invention. The yarn feeding device 100A according to the second embodiment has an anti-vibration member 90A having a configuration different from that of the anti-vibration member 90 of the first embodiment. The same reference characters are given to components that are identical to those of the first embodiment, and detailed description for such components is omitted.
FIGS. 11A and 11B are each a cross-sectional view of a driven roller support mechanism 20A that constitutes the yarn feeding device 100A according to the second embodiment of the present invention. FIG. 11A shows a state where the arm 30 is switched to the third separated posture PB3, and FIG. 11B shows a state where the arm 30 is switched to the contact posture PA1.
As shown in FIGS. 11A and 11B, the anti-vibration member 90A is formed such that the guide portion 93A is elongated upward. The length of the guide portion 93A is set so that, when the posture of the arm 30 is switched to the third separated posture PB3, the distal end portion of the guide portion 93A is positioned inside the accommodating portion 34 of the arm 30. Therefore, when the arm 30 having been switched to the third separated posture PB3 is brought back to the contact posture PA1 through the second separated posture PB2 and the first separated posture PB1, the anti-vibration member 90A can always be positioned on the moving trajectory of the accommodating portion 34.
According to the yarn feeding device 100A according to the present embodiment, the guide portion 93A of the anti-vibration member 90A is partially positioned inside the accommodating portion 34 even when the arm 30 is largely rotated to switch its posture to the third separated posture PB3. When the posture of the arm 30 is brought back from the third separated posture PB3 to the contact posture PA1, the guide portion 93A reliably guides the contact portion 95 of the anti-vibration member 90A into inside of the accommodating portion 34. Therefore, when the arm 30 is brought back from the third separated posture PB3 to the contact posture PA1, the anti-vibration member 90A does not inadvertently come off from the accommodating portion 34, allowing for the suppression of vibrations of the driven roller 12 and the arm 30 while the yarn is running.

[Third Embodiment]

Next, the following describes a yarn feeding device 100B according to a third embodiment of the present invention. The yarn feeding device 100B according to the third embodiment has an anti-vibration member 90B having a configuration different from that of the anti-vibration member 90 of the first embodiment. The same reference characters are given to components that are identical to those of the first embodiment, and detailed description for such components is omitted.
FIGS. 12A and 12B are each a cross-sectional view of a driven roller support mechanism 20B that constitutes the yarn feeding device 100B according to the third embodiment of the present invention. FIG. 12A shows a state where the arm 30 is switched to the third separated posture PB3, and FIG. 12B shows a state where the arm 30 is switched to the contact posture PA1.
As shown in FIGS. 12A and 12B, the rotation support 92B of the anti-vibration member 90B is provided with a restriction portion 97B. The restriction portion 97B is formed to extend toward the support 50. The restriction portion 97B comes into contact with the support 50 when the anti-vibration member 90B is rotated to a predetermined angle relative to the rotation shaft 83. This allows for restriction of a swingable range of the anti-vibration member 90B relative to the support 50.
The shape and position of the restriction portion 97B are set so that the anti-vibration member 90B is positioned inside the virtual line AR1, which indicates the moving trajectory of the accommodating portion 34, when the anti-vibration member 90B is rotated. As a result, when the arm 30 that has been switched to the third separated posture PB3 is brought back to the contact posture PA1 through the second separated posture PB2 and the first separated posture PB1, the anti-vibration member 90B can be positioned inside the accommodating portion 34.
According to the yarn feeding device 100B of this embodiment, the restriction portion 97B of the anti-vibration member 90B comes into contact with the support 50. As a result, the restriction portion 97B restricts the swingable range of the anti-vibration member 90 with respect to the support 50 so that the anti-vibration member 90 is positioned on the moving trajectory of the accommodating portion 34 when the arm 30 is brought back from the third separated posture PB3 to the contact posture PA1. Therefore, when the arm 30 is brought back from the third separated posture PB3 to the contact posture PA1, the contact portion 95B of the anti-vibration member 90B can be reliably guided into the inside of the accommodating portion 34, allowing for the suppression of vibrations in the driven roller 12 and the arm 30 while the yarn is running.

[Fourth Embodiment]

Next, the following describes a yarn feeding device 100C according to a fourth embodiment of the present invention. The yarn feeding device 100C according to the fourth embodiment has an anti-vibration member 90C having a configuration different from that of the anti-vibration member 90B of the third embodiment. The same reference characters are given to components that are identical to those of the first embodiment, and detailed description for such components is omitted.
FIG. 13 is a cross-sectional view of a driven roller support mechanism 20C that constitutes the yarn feeding device 100C according to the fourth embodiment of the present invention. FIG. 13 shows a state where the arm 30 is switched from the third separated posture PB3 to the first separated posture PB1.
As shown in FIG. 13, the rotation support 92C of the anti-vibration member 90C is provided with a restriction portion 97C. The restriction portion 97C is formed by obliquely extending an end of the rotation support 92C. The restriction portion 97C comes into contact with the support 50 when the anti-vibration member 90C is rotated to a predetermined angle relative to the rotation shaft 83. This allows for restriction of a swingable range of the anti-vibration member 90C relative to the support 50.
The shape and position of the restriction portion 97C are set so that the guide portion 93C of the anti-vibration member 90C is positioned on the virtual line AR1, which indicates the moving trajectory of the accommodating portion 34, when the anti-vibration member 90C is rotated. As a result, when the arm 30 that has been switched to the third separated posture PB3 is brought back to the contact posture PA1, the guide portion 93C comes into contact with a lower portion of the front surface 35 of the accommodating portion 34, so that the anti-vibration member 90C can be guided inside the accommodating portion 34. Note that the shape of the guide portion 93C is such that an inclined surface is formed to guide the anti-vibration member 90C inside the accommodating portion 34 when the lower portion of the front surface 35 of the accommodating portion 34 comes into contact.
According to the yarn feeding device 100C of this embodiment, the restriction portion 97C of the anti-vibration member 90C comes into contact with the support 50. As a result, the restriction portion 97C restricts the swingable range of the anti-vibration member 90 with respect to the support 50 so that the guide portion 93C of the anti-vibration member 90 is positioned on the moving trajectory of the accommodating portion 34 when the arm 30 is brought back from the third separated posture PB3 to the contact posture PA1. Therefore, when the arm 30 is brought back from the third separated posture PB3 to the contact posture PA1, the contact portion 95C of the anti-vibration member 90C can be reliably guided into the inside of the accommodating portion 34, allowing for the suppression of vibrations of the driven roller 12 and the arm 30 while the yarn is running.

[Fifth Embodiment]

Next, the following describes a yarn feeding device 100D according to a fifth embodiment of the present invention. The yarn feeding device 100D according to the fifth embodiment has an anti-vibration member 90D having a configuration different from that of the anti-vibration member of other embodiments. The same reference characters are given to components that are identical to those of the first embodiment, and detailed description for such components is omitted.
FIGS. 14A and 14B are each a cross-sectional view of a driven roller support mechanism 20D that constitutes the yarn feeding device 100D according to the fifth embodiment of the present invention. FIG. 14A shows a state where the arm 30 is switched to the third separated posture PB3, and FIG. 14B shows a state where the arm 30 is switched to the contact posture PA1.
As shown in FIGS. 14A and 14B, the anti-vibration member 90D is a member with a substantially square cross-sectional shape. The anti-vibration member 90D is positioned inside the accommodating portion 34 of the arm 30. The anti-vibration member 90D is arranged to penetrate the accommodating portion 34 and is supported on the left side surface 38 and the right side surface 38 of the arm 30.
In FIG. 14A, the posture of the arm 30 is switched to the third separated posture PB3, and the posture of the biasing member 80 is switched to the third release posture PY3. The biasing member 80 having been switched to the third release posture PY3 is separated from the anti-vibration member 90D and is in a state of not pressing the anti-vibration member 90D.
In FIG. 14B, the posture of the arm 30 is switched to the contact posture PA1, and the posture of the biasing member 80 is switched to the pressing posture PX1. The biasing member 80 having been switched to the pressing posture PX1 is in a state of pressing the anti-vibration member 90D, causing the anti-vibration member 90D to be pressed against the front surface 35 of the accommodating portion 34 of the arm 30. The anti-vibration member 90D pressed against the front surface 35 of the accommodating portion 34 generates frictional resistance between the anti-vibration member 90D and the arm 30, allowing for the suppression of vibration of the arm 30 and the driven roller 12 while the yarn Y is running.
According to the yarn feeding device 100D of the present embodiment, the anti-vibration member 90D is positioned inside the accommodating portion 34 of the arm 30. Therefore, when the arm 30 is brought back from the third separated posture PB3 to the contact posture PA1, the anti-vibration member 90D can be reliably pressed by the biasing member 80, allowing for the suppression of vibrations of the driven roller 12 and the arm 30 while the yarn is running.

The embodiments disclosed herein are illustrative in all respects and shall not be construed as limiting. The technical scope of the present invention is not to be interpreted as being limited to the above-described embodiments, but is defined by the description of the claims. The technical scope of the present invention includes all variations within the meaning and scope equivalent to the claims.
For example, the shape of the anti-vibration member used in the yarn feeding device of the present invention is not limited to those described in the embodiments. For example, as in an anti-vibration member 90E shown in FIG. 15A, a restriction portion 97E may be provided with an insertion hole 98E. By inserting the biasing member 80 through the insertion hole 98E, the anti-vibration member 90E can be reliably engaged with the biasing member 80.
Further, for example, as in an anti-vibration member 90F shown in FIG. 15B, a restriction portion 97F may be provided with an insertion hole 98F, and the anti-vibration main body 91 may surround the biasing member 80. In this case, the restriction portion 97F can be brought closer to the biasing member 80, and a change in the posture of the restriction portion 97F can be closer to a change in the posture of the biasing member 80.
The above-described embodiments deal with an example where the yarn feeding device is applied to a false-twist machine as a textile machine; however, the textile machine to which the yarn feeding device is applicable is not limited to the false-twist machine. For example, the yarn feeding device of the present invention may be applied to a textile machine for producing POY, or it may be applied to a textile machine for producing fully drawn yarn (FDY).

DESCRIPTION OF REFERENCE CHARACTERS

100: Yarn Feeding Device
200: False-Twist Machine (Textile Machine)
218: Yarn Path
11: Drive Roller
12: Driven Roller
20: Driven Roller Support Mechanism
30: Arm
34: Accommodating Portion
35: Front Surface (Contacted Portion)
50: Support
70: Lever
80: Biasing Member
83: Rotation Shaft
90: Anti-Vibration Member
93: Guide Portion
95: Contact Portion
96: Pressed Portion
97: Restriction Portion
PA1: Contact Posture
PB1: First Separated Posture
PB2: Second Separated Posture
PB3: Third Separated Posture
PX1: Pressing Posture
PY1: First Release Posture
PY2: Second Release Posture
PY3: Third Release Posture
AR1: Moving Trajectory

Claims

A yarn feeding device (100,100A,100B,100C,100D) arranged in a yarn path (218) of a textile machine (200), the yarn feeding device (100,100A,100B,100C,100D) comprising:
a plurality of drive rollers (11);

a plurality of driven rollers (12) each of which is paired with a corresponding one of the plurality of drive rollers (11); and

a plurality of driven roller support mechanisms (20,20A,20B,20C,20D) each of which is configured to support a corresponding one of the plurality of driven rollers (12), wherein

each of the plurality of driven roller support mechanisms (20,20A,20B,20C,20D) includes:
an arm (30) configured to support the corresponding driven roller (12);

a support (50) configured to rotatably support the arm (30);

a lever (70) configured to switch a posture of the arm (30) between a contact posture (PA1) in which the corresponding driven roller (12) is in contact with the corresponding drive roller (11) and a separated posture (PB1,PB2,PB3) in which the corresponding driven roller (12) is separated from the corresponding drive roller (11);

a biasing member (80) that is configured to bias the arm (30) in a direction in which the corresponding driven roller (12) is pressed against the corresponding drive roller (11) in the contact posture (PA1) and that is rotatably engaged with the support (50) so that a posture of the biasing member (80) is switched from a release posture (PY1,PY2,PY3) to a pressing posture (PX1) with switching of the posture of the arm (30) from the separated posture (PB1,PB2,PB3) to the contact posture (PA1); and

an anti-vibration member (90,90A,90B,90C,90D,90E,90F) having a contact portion (95,95B,95C,95E,95F) arranged to face a contacted portion (35) to be contacted provided on the arm (30) in the contact posture (PA1), and

in a state where the arm (30) is switched to the contact posture (PA1), the biasing member (80) having been switched to the pressing posture (PX1) presses the contact portion (95,95B,95C,95E,95F) of the anti-vibration member (90,90A,90B,90C,90D,90E,90F) against the contacted portion (35) of the arm (30).
The yarn feeding device (100,100A,100B,100C) of claim 1, wherein
the arm (30) has an accommodating portion (34) configured to accommodate part of the anti-vibration member (90,90A,90B,90C,90E,90F) in the contact posture (PA1) and having the contacted portion (35) provided inside, and is rotatable in the separated posture (PB1,PB2,PB3) to a position where the contact portion (95,95B,95C,95E,95F) comes off from the accommodating portion (34); and

the anti-vibration member (90,90A,90B,90C,90E,90F) is rotatably supported by the support (50) and has a guide portion(93,93A,93C) configured to guide the contact portion (95,95B,95C,95E,95F) into inside of the accommodating portion (34) when the arm (30) is brought back from the separated posture (PB1,PB2,PB3) to the contact posture (PA1).
The yarn feeding device (100,100A,100B,100C) of claim 2, wherein:
in a state where the arm (30) is switched to the separated posture (PB1,PB2,PB3), part of the guide portion(93,93A,93C) is positioned inside the accommodating portion (34).
The yarn feeding device (100,100A,100B,100C) of claim 2, wherein
in a state where the arm (30) is switched to the separated posture (PB1,PB2,PB3), the guide portion(93,93C) comes off from the accommodating portion (34); and

the anti-vibration member (90,90B,90C,90E,90F) has a restriction portion (97,97B,97C,97E,97F) configured to restrict the posture of the anti-vibration member (90,90B,90C,90E,90F) so that the guide portion(93,93C) is positioned on a moving trajectory (AR1) of the accommodating portion (34) when the arm (30) is brought back from the separated posture (PB1,PB2,PB3) to the contact posture (PA1).
The yarn feeding device (100,100A) of claim 4, wherein
the restriction portion (97,97E,97F) is formed to extend toward the biasing member (80) and is engaged with the biasing member (80) to restrict the posture of the anti-vibration member (90,90E,90F).
The yarn feeding device (100B,100C) of claim 4, wherein
the restriction portion (97B,97C) is formed to extend toward the support (50) and contacts the support (50) to restrict a swingable range with respect to the support (50).
The yarn feeding device (100,100A,100B,100C) of any one of claims 1 to 6, wherein
the anti-vibration member (90,90A,90B,90C,90E,90F) is rotatably supported with respect to the support (50) by a rotation shaft (83) that is the same as a rotation shaft (83) of the biasing member (80), and has a pressed portion (96,96E,96F) to be pressed by the biasing member (80), the pressed portion (96,96E,96F) being provided on a side closer to the rotation shaft (83) than the contact portion (95,95B,95C,95E,95F).