JP2920521B2 - Anti-friction type yarn feed roller and method of lubricating yarn feed roller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction reducing yarn feed roller applicable to looms, false twisting machines, warp knitting machines and other various yarn unwinding devices and yarn supply devices for unwinding yarns, and yarns. More specifically, the method of reducing the friction of the feed roller, more specifically, by effectively varying the contact position between the yarn feed roller and the yarn passing therethrough, effectively suppressing local abrasion on the peripheral surface of the yarn feed roller. The present invention relates to a revolutionary apparatus and method capable of greatly improving the durability of a feed roller.

[0002]

2. Description of the Related Art In a loom, a false twisting machine, a warp knitting machine, and other various yarn unwinding devices and yarn supply devices for unwinding yarn, a large number of yarn feed rollers are provided everywhere. These yarn feed rollers enable the yarn of a required length to be continuously or intermittently fed at high speed.

However, in such a yarn feeder, the contact position between the yarn feed roller rotating at a high speed and the yarn passing through the peripheral surface of the roller is usually determined at one place. The peripheral surface of the roller at the position rubs against the thread, and the thread is intensively scratched, resulting in a groove-like thread rub mark. In addition, in a device that feeds yarn at high speed, frictional heat is generated on the peripheral surface of the yarn feed roller, and the yarn is easily rubbed. There was a problem of getting deeper in time.

When the yarn is fed in a state where the yarn is fitted into the groove portion of the yarn rubbing mark, the pressing force of the yarn feeding roller against the yarn is reduced and the yarn slips or the yarn feeding roller at the yarn rubbing mark causes the yarn to slip. Troubles such as an increase in the error of the delivered yarn length due to a decrease in the diameter are likely to occur, and in the worst case, the yarn is wound around the yarn feed roller and the troublesome threading operation has to be performed again. .
When such troubles as slipping and thread winding occur, the quality and work efficiency are greatly reduced.
When a thread rub mark is formed on the peripheral surface of the yarn feed roller, it is necessary to replace the roller with a new one as soon as possible. For this reason, there have been complaints that the life of the yarn feed roller is shortened and the cost is increased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional yarn feed roller, and has been developed in view of the contact position between the yarn feed roller and the yarn passing therethrough. The invention provides an epoch-making apparatus and method capable of effectively suppressing local abrasion on the peripheral surface of the yarn feed roller and significantly improving the durability of the yarn feed roller by skillfully varying the yarn feed roller. Technical issues.

[0006]

Means adopted by the present inventor for solving the above technical problem will be described below with reference to the accompanying drawings.

That is, the present invention relates to a yarn feed roller which presses against a yarn connected to a yarn feeding section and sequentially feeds the yarn at a predetermined speed; Means comprising: a yarn swinging guide for reciprocatingly swinging a yarn; and a yarn swinging control mechanism for evenly distributing a contact position between the yarn feeding roller and the fed yarn over substantially the entire peripheral surface width of the roller. The feature of the present invention is that the above-mentioned device problem is solved by adopting the above.

In the present invention, when the yarn connected to the yarn feeding section is introduced into the yarn feed roller, the yarn is swung in the width direction of the yarn feed roller by a yarn swinging guide at a required swing speed. By distributing the contact position between the yarn feed roller and the yarn to be sent out uniformly over almost the entire width of the peripheral surface of the roller, and adopting a means of suppressing local abrasion of the roller, the above-mentioned method problem is solved. There is a feature in solving the problem.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings. 1 is a perspective explanatory view showing an outline of a loom to which an embodiment of the present invention is applied, FIG. 2 is a partial perspective view showing a structure in the vicinity of a yarn feed roller and a yarn swing guide of the loom of FIG. 1, 3 is an enlarged perspective explanatory view showing a part of the vicinity of a contact position between the peripheral surface of the yarn feed roller and the yarn in FIG. 2, and FIG. 4 is a part showing a structure near a cam in a yarn swing control mechanism of the loom of FIG. FIG. 5 is a front view of the cam of FIG. 4, FIG. 6 is a cam diagram showing the movement of the cam, and FIG. 7 shows the locus of one cycle of the yarn reciprocating on the peripheral surface of the yarn feed roller. FIG. 8 is an explanatory view showing the number of passes of a yarn passing through each turn point of the locus of FIG. 7 in the yarn feed direction per cycle, and FIG. 9 is a diagram showing the contact of the yarn pressed against the peripheral surface of the yarn feed roller. FIG. 10 is a cross-sectional explanatory view showing a comparison between the width and the interval between each of the turning points, and FIG. FIG. 11 is an explanatory view showing another modified example of the trajectory drawn by the reciprocating yarn, and FIG. 12 is an explanatory view showing another modified example of the trajectory drawn by the reciprocating yarn. FIG. 13 is a schematic explanatory view showing a mechanism of a false twisting machine to which an embodiment of the present invention is applied.

First, an example in which the embodiment of the present invention is applied to a loom will be described with reference to FIGS. In the figure, what is indicated by reference numeral Y is a yarn connected to the yarn supplying section S, and in the present embodiment, is a weft constituting a woven fabric. The yarn Y is sent out from the yarn supply section S via a yarn feed roller described later and inserted into the shed. The yarn feed roller of the present embodiment is disposed in a weft feed mechanism of a conventionally known water jet loom (Water Jet Loom).

Reference numeral 1 designates a yarn feed roller for sequentially and intermittently feeding the yarn Y from the yarn feeding section S in the opening direction in a predetermined cycle. This yarn feed roller 1
Is formed by fixing a synthetic rubber cylinder having a required width to the rotating shaft 11. The one designated by reference numeral 2 is the rotation axis.
This is a motor for rotating the 11.

Reference numeral 3 designates a press roller for pressing the yarn Y against the peripheral surface of the yarn feed roller 1 to surely perform the yarn feed. The press roller 3 is rotatably mounted on a roller shaft 31, and the motor 2
Is driven, the yarn feed roller 1 rotates, and the yarn feed roller 1 rotates following the rotation. Reference numeral 4 denotes a roller shaft 31 of the press roller 3 and a rotation shaft of the yarn feed roller 1.
11 is a roller support member that supports the roller 11 and has a bell crank shape. This roller support member 4 is
The size of the yarn feed roller 1 and the press roller 3 installed there is changed by adjusting the position where the roller shaft 31 is supported in the long hole 41 and changing the distance between the axes of the yarn feed roller 1 and the press roller 3. It is possible to

The reference numeral 5 designates a lever-shaped yarn swinging guide for reciprocatingly oscillating the yarn in the width direction of the yarn feeding roller 1, and is provided on the yarn feeding side of the yarn feeding roller 1. It is arranged. The yarn swinging and guiding body 5 is pivotally supported so as to be able to swing substantially horizontally with a substantially central portion as a fulcrum. A threading mail (mail) 51 through which the yarn Y is inserted is bored at its free end. ing. A long hole 52 is formed substantially at the center of the yarn swinging guide 5, and the position of a fulcrum in the long hole 52 is adjustable. Further, a wire connecting portion 53 for connecting one end of a wire described later is provided at the working end opposite to the threading mail 51 (see FIG. 2).

A member indicated by reference numeral 6 is a support member for supporting the above-mentioned yarn swinging and guiding body 5. This support member 6
A substantially U-shaped frame 61; a pivot bolt shaft 62 projecting from a horizontal portion of the frame 61 and pivotally supporting the yarn swinging guide 5 in the aforementioned long hole 52 so as to be swingable; Axis 62
A tension coil spring 64, one end of which is connected to the working end side of the thread swing guide 5 and the other end of which is connected to the side of the frame 61; And a fixing portion 65 fixed to the upper end of the roller support member 4. When the yarn guide 5 is supported by the support member 6 in this manner, when the yarn guide 5 swings, the thread Y inserted through the threading mail 51 is swung, and is shown in FIG. Thus, the contact position of the yarn Y reciprocally changes right and left on the peripheral surface of the yarn feed roller 1. Further, by adjusting the position of the pivot bolt shaft 62 pivotally supporting the long hole 52 of the yarn swinging and guiding body 5 to change the length from the pivot bolt shaft 62 to the threading mail 51, the yarn feed roller 1
The swing amplitude of the yarn Y by the yarn swinging and guiding body 5 can be freely adjusted according to the size of the circumferential surface width and the contact width of the yarn Y on the circumferential surface of the roller 1. In the present embodiment,
The swing amplitude is set in a range of about 4 mm to 20 mm.

A member designated by reference numeral 7 is a transmission member for transmitting the power required to swing the yarn swinging guide 5 in the width direction of the yarn feed roller 1. This transmission member 7
As shown in FIG. 4, a wire 71 having one end connected to a wire connecting portion 53 at the operating end of the yarn swinging yarn guide 5; a swing lever 72a having the other end connected to the wire 71; A connecting member comprising a rod 72b connected to one end of a swing lever 72a
72; a clamp 73 fastened across the rod 72b of the connecting device 72; and a driven bar 74 suspended from the clamp 73;
A driven wheel 75 is attached to the end of the driven bar 74. With the transmission member 7 configured as described above,
Rotational motion of a cam, which will be described later, is converted to linear motion and transmitted to the yarn guiding member 5 via the wire 71, and the yarn Y can be rocked by the yarn guiding member 5.

The reference numeral 8 designates a rotary cam which gives a periodic motion necessary for the oscillation of the yarn Y via the transmission member 7, the support member 6 and the yarn swinging and guiding body 5. The cam 8 is fixed to one roll shaft 81 of a number of rolls (see FIG. 1) used for winding a woven fabric to be woven, and the continuous rotation of the roll shaft 81 causes a predetermined rotation of the transmission member 7. A periodic restraint movement is generated. As shown in FIG. 5, the shape of the cam 8 is such that the vertices b, d... From the center z of the roll shaft 81 and the intermediate points a, c,. Are polygons having different distances from each other (in this embodiment, a decagon having 10 vertices). In this polygon, the distance from the center point z to each vertex and the intermediate point is the shortest to the intermediate point a. The intermediate point a is defined as the starting point, and the intermediate point a is set as the standard diameter. FIG. 5 shows a cam standard virtual circle α. Then, all other vertices b are added to the extension of the virtual circle α.
.. And intermediate points c, e,... Define the required eccentricity. The vertices b, d,... Of the cam 8 are protruding portions formed in a salient shape, and each of the protruding portions forms a concave arc substantially close to a straight line. From the point a to the vertex b, the intermediate point c, and the vertices d to t, a low-valley, a mountain, a valley,... The cam 8 having such a contour can shorten the contact time of a turning point described later in the convex portion which is a salient apex, thereby reducing the wear of the peripheral surface of the yarn feed roller 1 at the turning point. In addition, the driven wheel 75 makes contact with the concave arc without any gap, so that the required swing amount can be reliably given to the yarn swinging and guiding body 5.

FIG. 6 is a cam diagram showing the movement of the cam 8 having the above-described contour. The rotation angle position of the cam 8 is plotted on the horizontal axis, and the eccentric amount of the cam 8 is plotted on the vertical axis. In this cam diagram, each vertex b · d...
.. Are set at equal intervals every 18 °, and the eccentric amount of each of these vertices and intermediate points fluctuates roughly in an arc shape while repeatedly increasing and decreasing in a sawtooth shape. In accordance with the eccentric amount that fluctuates in this manner, the amount and timing of the oscillation of the yarn swinging and guiding body 5 are controlled via the driven wheel 75 that contacts the peripheral surface of the cam 8,
The turning points to be described later can be evenly distributed.

The transmission member 7 and the cam 8 constitute a thread swing control mechanism. When the thread swing control mechanism (7, 8) is operated, the thread Y to be fed is reciprocated in the width direction of the thread feed roller 1 and slid on the peripheral surface of the roller 1. And the thread Y
A serrated locus as shown in FIG. 7 is drawn. FIG.
Shows the trajectory of one cycle when the cam 8 is rotated once, and the turning points a to t of the sawtooth trajectory are shown.
Correspond to the vertices b, d,... Of the cam 8 and the intermediate points a, c,. In this embodiment, the oscillation time of the yarn Y required for one cycle is set to 8 minutes.

The turning points a to t correspond to the respective vertices and intermediate points by forming the cams 8 in polygons having different distances from the center z of the roll shaft 81 to the respective vertices and intermediate points. The swing amplitudes of the yarns Y are different from each other and are uniformly distributed over almost the entire width of the circumferential surface of the yarn feed roller 1. More specifically, in the trajectory of the yarn Y in one cycle, there are no two turning points in an arbitrary line in a direction perpendicular to the width direction of the peripheral surface of the yarn feed roller 1 in one cycle. a to t do not overlap each other on one straight line in the yarn feed direction. Therefore, the contact position between the yarn Y to be fed and the yarn feed roller 1, particularly the turning points a to where the frictional force between them becomes large.
Since t is distributed evenly over almost the entire width of the circumferential surface of the yarn feed roller 1, only one portion of the circumferential surface of the roller 1 can be intensively scratched and a deep groove-like yarn rubbing trace can be formed. Therefore, local wear on the peripheral surface of the yarn feed roller 1 can be effectively suppressed, and the durability of the yarn feed roller 1 is greatly improved.

Then, a straight line passing through each of the turning points a to t is drawn by a dotted line in a direction perpendicular to the width direction of the circumferential surface of the yarn feed roller 1 as shown in FIG. The lower part of FIG. 8 shows the number of passes per cycle of the yarn Y passing through each of the folding points a to t in the yarn feed direction. The number of passes is from the both ends of the width of the yarn feed roller 1 to the center. , And 11 times near the center (for example, at the turning points t, i, d,...). As described above, although the number of passes of the yarn Y per cycle is large in the vicinity of the central portion of the circumferential surface width of the yarn feed roller 1, only the circumferential surface of the yarn feed roller 1 near the central portion is not displaced and worn. . This is because the frictional force at each of the turning points a to t is relatively large as compared with the frictional force when sliding between the respective turning points in the width direction, and the wear due to the sliding movement is smaller at each of the turning points. This is because the wear proceeds very uniformly as a whole as compared with the wear at the point.

In this embodiment, as shown in FIG. 9, at each turn point of the locus of the yarn Y which slides on the surface of the yarn feed roller 1, a certain turn point and a yarn The distance G (for example, the distance between the return point a and the return point s, the distance between the return point s and the return point c, etc.) in the width direction of the circumferential surface of the feed roller 1 and the yarn feed roller 1 Is set to be equal to or less than the contact width W of the yarn Y pressed against the peripheral surface. Such a setting condition can be satisfied by the polygonal cam 8 having a large number of vertices corresponding to the turning points, even when the fine yarn Y having a small contact width W is used. And the use of a polygonal cam 8 having at least seven vertices is preferred.

The turning points a to t where the frictional force is large
Are uniformly distributed in the width direction of the peripheral surface of the yarn feed roller 1, so that the wear at each of the turning points a to t is as shown in FIG.
As shown in the figure, extremely small wear marks are formed uniformly over almost the entire width of the circumferential surface of the yarn feed roller 1.
Actually, the life of the conventional yarn feed roller 1 was 3 to 4 months. However, even if the yarn feed roller 1 of the present embodiment is used for 3 to 4 years, there is almost no wear mark and there is no trouble in operation. Was. Therefore, since the abrasion on the peripheral surface of the roller 1 is minute so as not to hinder the operation, the occurrence of troubles such as slipping or winding of the yarn Y can be effectively suppressed, and The service life can be greatly extended. In this embodiment, the yarn Y slides reciprocally over almost the entire width of the peripheral surface of the yarn feed roller 1. However, when a fine yarn Y having a small contact width W is used, the yarn Since the above-mentioned gap G becomes narrower with the narrow contact width W, the yarn Y on the peripheral surface of the roller 1 is formed.
It is necessary to shorten the swing amplitude of

The trajectory of the yarn Y which reciprocates on the peripheral surface of the yarn feed roller 1 in one cycle includes
A locus that gradually converges from both ends to the center of the circumferential width of the yarn feed roller 1 and returns to one end (see FIG. 11), and a circumferential surface of the yarn feed roller 1 with substantially the same amplitude. It is also possible to adopt a trajectory (see FIG. 12) that moves in a sawtooth form from one end of the width to the other end and then returns to the original end. In other words, it is only necessary that each turning point in the reciprocating motion be a locus that is evenly distributed over almost the entire peripheral surface width of the yarn feed roller 1.

Finally, an example in which the embodiment of the present invention is applied to a false twisting machine will be described with reference to FIG. FIG. 13 shows the overall flow of the yarn processing by the false twisting machine, and the yarn feed rollers 1 are provided at two positions. One point is a process in which the yarn Ya wound on the cone C (Cone) is being fed to the heater H, and another point is where the yarn Ya softened through the heater H is twisted by the spindle P. Twisted yarn Yb
Is being sent to the beam B (Beam). Since a similar yarn feed mechanism is adopted in both of these portions, only the former mechanism of the original yarn Ya will be described.

First, the yarn Ya wound around the cone C is pulled out and inserted into the threading mail 51 of the plate-shaped yarn swinging and guiding body 5. The yarn feed roller 1 is rotated while the surfaces are pressed against each other, and the raw yarn Ya is sequentially fed to the heater H at a predetermined speed. At the time of this feeding, the servo shaft 9 rotates the motor shaft 91 connected to one end of the yarn swinging guide 5 forward and backward at a predetermined cycle. Then, the original yarn Ya inserted into the threading mail 51 of the yarn swinging and guiding body 5 is reciprocally swung in the width direction of the peripheral surface of the yarn feed roller 1, and the fed original yarn Ya and the yarn feeder are fed. The contact positions with the roller 1 are evenly distributed over almost the entire width of the peripheral surface of the roller 1. In the present embodiment, the operation of the servo motor 9 can be controlled by the computer M.

Therefore, as in the case of application to the loom, only one location on the peripheral surface of the yarn feed roller 1 is not concentrated and scratches, and deep groove-like thread rubbing marks are not attached. It is possible to effectively suppress the local abrasion on the peripheral surface of the yarn feed roller 1, and to greatly improve the durability of the yarn feed roller 1.

Although the embodiments of the present invention are generally as described above, the present invention is by no means limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Thus, for example, the shape of the rotary cam 8 used for the thread swing control mechanism of the present embodiment can be appropriately changed to a polygon other than a decagon, or a cam mechanism of other various shapes can be adopted. Further, in the present embodiment, an example is shown in which one thread swing guide 5 is swung by one thread swing control mechanism, but a plurality of thread swing guides 5 are provided.
.. Are connected by a connecting rod or the like, and each of the yarn swing guide members 5 can be appropriately shaken by a single yarn swing control mechanism. It goes without saying that it belongs to the target range.

[0028]

As described above with reference to the embodiments,
According to the present invention, a conventional yarn feed mechanism is employed in which the position of contact between the yarn feed roller and the yarn passing therethrough is skillfully fluctuated by using a yarn swing guide and a yarn swing control mechanism. As in the case of the feed roller, only one point on the peripheral surface of the roller is not intensively scratched and a deep groove-like yarn rubbing trace is not formed, and the contact position between the yarn to be sent and the yarn feed roller is determined by the roller peripheral surface width. Since it is evenly distributed over almost the entire area, it is possible to effectively suppress local abrasion on the peripheral surface of the yarn feed roller and greatly improve the durability of the yarn feed roller.

In the present invention, when the yarn to be fed is reciprocated in the width direction of the yarn feed roller,
Since the turning points among the contact positions between the yarn and the yarn feed roller are evenly distributed over almost the entire width of the peripheral surface of the roller, the turning points with a large frictional force are dispersed and the friction effect of the yarn feed roller is reduced. Can be further increased.

Further, according to the present invention, at each of the turning points, the distance between a certain turning point and the closest turning point in the width direction of the circumferential surface of the yarn feed roller at this point is determined by the circumferential surface of the yarn feed roller. Since the contact width of the thread to be pressed against is set to be equal to or less than the thread width, very small wear marks are formed evenly over almost the entire circumferential width of the thread feed roller so as not to hinder operation. As a result, troubles such as slipping and winding of the yarn can be effectively suppressed, and the life of the yarn feed roller can be greatly extended. Therefore, the industrial utility value of a weaving machine, a false twisting machine, a warp knitting machine, and other various yarn unwinding devices and yarn supply devices for unwinding yarn is extremely large.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view showing an outline of a loom to which an embodiment of the present invention is applied.

FIG. 2 is a partial perspective view showing a structure in the vicinity of a yarn feed roller and a yarn swing guiding body of the loom of FIG.

FIG. 3 is an enlarged perspective explanatory view showing a part near a contact position between a yarn peripheral surface of a yarn feed roller and a yarn in FIG. 2;

FIG. 4 is a partial perspective view showing a structure near a cam in a yarn swing control mechanism of the loom of FIG. 1;

FIG. 5 is an explanatory front view of the cam of FIG. 4;

FIG. 6 is a cam diagram showing the movement of the cam.

FIG. 7 shows a yarn 1 that reciprocates on the peripheral surface of the yarn feed roller.
FIG. 4 is an explanatory diagram showing a cycle trajectory.

8 is an explanatory diagram showing the number of times a thread passes through each turn point of the locus of FIG. 7 in the yarn feed direction per cycle.

FIG. 9 is a cross-sectional explanatory view showing a comparison between a contact width of a yarn pressed against the peripheral surface of the yarn feed roller and an interval between each of the turning points.

FIG. 10 is an explanatory cross-sectional view showing a state of a thread rub mark on the peripheral surface of the thread feed roller.

FIG. 11 is an explanatory diagram showing another modified example of a trajectory drawn by a reciprocating yarn.

FIG. 12 is an explanatory diagram showing still another modified example of a trajectory drawn by a reciprocating yarn.

FIG. 13 is a schematic explanatory view showing a mechanism of a false twisting machine to which an embodiment of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thread feed roller 11 Rotary shaft 2 Motor 3 Press roller 31 Roller shaft 4 Roller support member 41 Long hole 5 Thread swing guide 51 Threading mail 52 Long hole 53 Wire connection part 6 Support member 61 Frame 62 Pilot bolt shaft 63 Nut 64 Tension coil spring 65 Fixed part 7 Transmission member 71 Wire 72 Connecting tool 72a Swing lever 72b Rod 73 Clamp 74 Follower bar 75 Follower wheel 8 Cam 81 Roll axis 9 Servo motor 91 Motor axis B beam C cone G (at the turning point) Interval H Heater M Computer P Spindle S Yarn feed section W (Yarn) Contact width Y Yarn Ya Yarn Yb Twisted yarn

Claims (9)

(57) [Claims] A yarn feed roller that presses against a yarn connected to a yarn feeder and sequentially feeds the yarn at a predetermined speed; and a yarn feed roller disposed on the yarn feed side of the yarn feed roller and reciprocates the yarn in the width direction of the yarn feed roller. And a yarn swing control mechanism for evenly distributing the contact position between the yarn feed roller and the fed yarn over substantially the entire width of the peripheral surface of the roller. Abrasive yarn feed roller. 2. The oscillating motion of a predetermined cycle can be given to the oscillating yarn guide by the oscillating control mechanism.
Anti-friction yarn feed roller. 3. The yarn swing control mechanism comprises a cam mechanism, and a push-pull action generated by the cam mechanism swings the yarn swing guide body at a predetermined cycle to control a contact position between the yarn and the yarn feed roller. 3. The anti-friction yarn feed roller according to claim 2, wherein: 4. A cam having at least seven convexly curved portions formed at required rotation angle positions, and the amount and timing of oscillation of the yarn swinging and guiding body are determined in accordance with the amount of eccentricity of each of these convexly curved portions. 4. The friction-reducing yarn feed roller according to claim 3, wherein the control is such that the turning points of the yarn on the peripheral surface of the yarn feed roller are evenly dispersed. 5. The yarn guiding member according to claim 1, wherein the yarn guiding member includes a rocking lever having a threading mail.
Anti-friction yarn feed roller. 6. A yarn formed by a thread swinging guide according to a contact width of a thread on a peripheral surface of a thread feed roller by changing a set position of a pivot bolt shaft pivotally supporting a long hole of the thread swinging guide. 6. The anti-friction type yarn feed roller according to claim 1, wherein the swing amplitude of the yarn is adjustable. 7. A yarn feeding roller, which introduces a yarn connected to a yarn feeding section into a yarn feeding roller by oscillating the yarn in a width direction of the yarn feeding roller at a required swing speed by a yarn oscillating yarn guide. A contact position between the feed roller and the yarn to be fed is evenly distributed over almost the entire peripheral surface width of the roller, thereby suppressing local abrasion of the roller. 8. The method according to claim 7, wherein the turning points of the trajectories drawn by the yarn reciprocatingly oscillated in the width direction of the yarn feed roller are evenly distributed over substantially the entire peripheral surface width of the roller. A method of lubricating the yarn feed roller. 9. At each turning point of a locus drawn by a yarn reciprocatingly oscillated in the width direction of the yarn feed roller, the distance between a certain turning point and the closest turning point in the roller width direction at this point is determined by: 9. The yarn according to claim 8, wherein the contact width of the yarn on the roller peripheral surface is set to be equal to or less than the width of the yarn, so that the yarn rubbing marks at each turning point are continuously formed in the width direction of the roller peripheral surface. How to reduce the friction of the feed roller.