Member for cleaning device of draft roller and cleaning device

Abstract

To provide a member for a cleaning device of a draft roller, which is capable of dispersing force acting on an outer peripheral surface of the draft roller and reducing localized contact, and a cleaning device.SOLUTION: There is provided a scraper (cleaning device member) 200, comprising: a facing surface 202 disposed opposite a back bottom roller 14a; and two contact portions 204 protruding from the facing surface 202 and spaced apart from each other in a width direction d1. Each of the contact portions 204 has a first portion 210 having a width A greater than a height H, and a second portion 220 connected to the first portion 210 at least on one side in a height direction d2. A width B of a connection portion 222 of the second portion 220 is 30% or more and 50% or less of the width A of the first portion 210.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a member for a cleaning device of a draft roller and to a cleaning device. [Background technology]

[0002] In the draft device of a spinning machine, a cleaning device that is attached to a draft roller is known. As described in Patent Documents 1 and 2, the cleaning device includes a magnet case, a magnet housed in the magnet case, and a resin scraper (or a contact member) that is attached to the magnet case. The cleaning device is detachably attached to the draft roller by the magnetic force of the magnet. The scraper is pressed against the outer peripheral surface of the draft roller. The scraper removes fibers that have adhered to the outer peripheral surface of the draft roller.

[0003] In the cleaning device described in Patent Document 1, the contact member has a surface facing the draft roller, and two elongated protrusions extending in the axial direction are provided on the surface. In the cleaning device described in Patent Document 2, the scraper has a surface facing the draft roller, and four elongated protrusions extending in the rotation direction of the draft roller are provided on the surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-101797 A [Patent Document 2] JP 2017-226940 A Summary of the Invention [Problem to be solved by the invention]

[0005] The bottom roller of the draft roller is made of a metal such as iron. As the operation time of the draft device progresses, the surface of the bottom roller may wear out. In the cleaning devices of Patent Documents 1 and 2, the convex portion is elongated, so the force applied by the cleaning device to the surface of the draft roller may be localized.

[0006] An object of the present invention is to provide a member for a cleaning device of a draft roller, and a cleaning device capable of dispersing the force acting on the surface of the draft roller and reducing localized contact. [Means for solving the problem]

[0007] A member for a cleaning device of a draft roller according to one aspect of the present invention extends in the long side direction and the short side direction. The member for a cleaning device includes an opposing surface disposed opposite the draft roller, and two contact portions protruding from the opposing surface and spaced apart in the width direction corresponding to the long side direction, each of the contact portions having a first portion whose width in the width direction is greater than its height in the height direction corresponding to the short side direction, and a second portion connected to the first portion at least in one of the height directions, and the width in the width direction of the connection portion of the second portion to the first portion is 30% to 50% of the width in the width direction of the first portion.

[0008] According to this cleaning device member, a second portion is provided at each of two contact portions spaced apart in the width direction, the second portion being connected to the first portion. The width of the connection portion of the second portion to the first portion is 30% to 50% of the width of the first portion, and the connection portion is wide. Therefore, the force applied to the surface of the draft roller is distributed over a wide range across the first and second portions. This makes it possible to reduce local contact with the surface of the draft roller.

[0009] In the width direction, the distance between the two second portions may be 2 to 2.5 times the distance between the two first portions, in which case the two second portions are sufficiently spaced apart to reliably ensure a gap required for the sliver to pass through.

[0010] In each of the contact portions, the second portion may be disposed outward from the center of the first portion in the width direction, which makes it easier to separate the two second portions and ensure a gap necessary for the sliver to pass through.

[0011] The first surface of the first portion and the second surface of the second portion may be arc-shaped with the same radius of curvature and the same center in a cross section perpendicular to the width direction. In this case, the second surface of the second portion, together with the first surface of the first portion, stably contacts the surface of the draft roller. This allows for more optimal force distribution.

[0012] In each of the contact portions, the second portion may be connected to the first portion in both height directions, and each of the contact portions may be substantially cross-shaped, which increases the contact area with the draft roller and improves the effect of dispersing the force.

[0013] The facing surface and the contact portion may be integrally formed, in which case the position of the contact portion with respect to the facing surface will not shift even if the contact portion receives a frictional force from the draft roller.

[0014] A cleaning device according to another embodiment of the present invention comprises a cleaning device member of any of the above-mentioned draft rollers, a cover member attached to the side opposite the opposing surface of the cleaning device member, and one or two magnets arranged between the cleaning device member and the cover member.

[0015] According to this cleaning device, the magnetic force of the magnet presses the contact portion of the cleaning device member against the outer circumferential surface of the draft roller. The force acting on the surface of the draft roller is dispersed over a wide range across the first and second portions, thereby reducing localized contact with the surface of the draft roller.

[0016] In the cleaning device, the two magnets may be arranged spaced apart from each other in the width direction, in which case the two magnets can apply appropriate pressing forces at appropriate positions or regions corresponding to the two contact portions.

[0017] In the cleaning device, one magnet may be disposed in the center in the width direction. In this case, the cleaning device can apply a pressing force via two contact parts by one magnet, which can simplify the configuration. Effect of the Invention

[0018] According to the present invention, the force applied to the surface of the draft roller is dispersed over a wide range across the first and second portions, so that localized contact with the surface of the draft roller can be reduced. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a front view of a spinning machine according to an embodiment. [Diagram 2] FIG. 2 is a plan view of a draft device to which a cleaning device according to an embodiment of the present invention is applied. [Diagram 3] FIG. 3 is a side view of a draft device to which a cleaning device according to an embodiment of the present invention is applied. [Figure 4] FIG. 4 is an exploded perspective view of the cleaning device. [Diagram 5] FIG. 5 is a cross-sectional view of the cleaning device of FIG. 4, in which the first portion and the second portion are cut along a plane perpendicular to the width direction. [Figure 6] FIG. 6 is a front view of the cleaning device member in FIG. [Figure 7] 7 is a front view showing the outer shape of a contact portion of the cleaning device member of FIG. [Figure 8] FIG. 8 is a front view showing the outer shape of a contact portion of a cleaning device member according to a modified example. [Figure 9]FIG. 9 is a front view showing the outer shape of a contact portion of a cleaning device member according to another modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0021] As shown in FIG. 1, the spinning machine 1 includes a plurality of spinning units 2, a yarn splicing carriage 3, a doffing carriage (not shown), a first end frame 4, and a second end frame 5. The plurality of spinning units 2 are arranged in a row. Each spinning unit 2 produces a yarn Y and winds it into a package P. When the yarn Y is cut in a certain spinning unit 2 or the yarn Y breaks for some reason, the yarn splicing carriage 3 performs a yarn splicing operation on that spinning unit 2. When the package P in a certain spinning unit 2 becomes full, the doffing carriage doffs the package P and supplies a new bobbin B to that spinning unit 2.

[0022] The first end frame 4 houses a collection device that collects fiber waste, lint, and the like generated in the spinning unit 2. The second end frame 5 houses an air supply unit that adjusts the pressure of compressed air (air) supplied to each part of the spinning machine 1 and supplies the air to each part, and a drive motor that supplies power to each part of the spinning unit 2. The second end frame 5 is provided with a machine control device 51, a display screen 52, and input keys 53. A touch panel screen may be provided instead of the display screen 52 and the input keys 53.

[0023] The machine control device 51 centrally manages and controls each part of the spinning machine 1. The display screen 52 can display information related to the settings and / or status of the spinning unit 2. The operator can perform setting work for the spinning unit 2 by performing appropriate operations using the input keys 53 or buttons displayed on the touch panel screen.

[0024] Each spinning unit 2 includes, in order from the upstream side in the running direction of the yarn Y, a draft device 6, an air spinning device 7, a yarn monitoring device 8, a tension sensor 9, a yarn storage device 11, a waxing device 12, and a winding device 13. A unit controller 10 is provided for each of a predetermined number of spinning units 2 and controls the operation of the spinning units 2.

[0025] The draft device 6 drafts the sliver (fiber bundle) S to generate a fiber bundle F. The air spinning device 7 twists the fiber bundle F generated by the draft device 6 with a swirling air flow to generate a yarn Y. In more detail (not shown), the air spinning device 7 has a spinning chamber, a fiber guide, a swirling air flow generating nozzle, and a hollow guide shaft. The fiber guide guides the fiber bundle F supplied from the upstream draft device 6 into the spinning chamber. The swirling air flow generating nozzle is disposed around the path along which the fiber bundle F travels. Air is sprayed from the swirling air flow generating nozzle to generate a swirling air flow in the spinning chamber. The swirling air flow causes each fiber end of the multiple fibers that make up the fiber bundle F to be inverted and swirled. The hollow guide shaft guides the yarn Y from inside the spinning chamber to outside the air spinning device 7.

[0026] The yarn monitoring device 8 monitors information on the traveling yarn Y between the air spinning device 7 and the yarn pooling device 11, and detects the presence or absence of a yarn defect based on the monitored information. When the yarn monitoring device 8 detects a yarn defect, it transmits a yarn defect detection signal to the unit controller 10. The yarn monitoring device 8 detects, for example, an abnormality in the thickness of the yarn Y and / or a foreign object contained in the yarn Y as a yarn defect. The yarn monitoring device 8 also detects yarn breakage and the like. The tension sensor 9 measures the tension of the traveling yarn Y between the air spinning device 7 and the yarn pooling device 11, and transmits a tension measurement signal to the unit controller 10. When the unit controller 10 determines that an abnormality exists based on the detection results of the yarn monitoring device 8 and / or the tension sensor 9, the yarn Y is cut in the spinning unit 2. Specifically, the supply of air to the air spinning device 7 is stopped, and the production of the yarn Y is interrupted, thereby cutting the yarn Y. Alternatively, the yarn Y may be cut by a cutter provided separately.

[0027] The waxing device 12 applies wax to the yarn Y between the yarn storage device 11 and the winding device 13.

[0028] The yarn pooling device 11 pools the yarn Y between the air spinning device 7 and the winding device 13. The yarn pooling device 11 has a yarn pooling roller that pools the yarn Y by winding the yarn Y around its outer circumferential surface. The yarn pooling device 11 has the following functions: stably drawing out the yarn Y from the air spinning device 7, pooling the yarn Y sent out from the air spinning device 7 during a yarn splicing operation by the yarn splicing cart 3, thereby preventing the yarn Y from slackening, and preventing fluctuations in the tension of the yarn Y downstream of the yarn pooling device 11 from being transmitted to the air spinning device 7.

[0029] The winding device 13 winds the yarn Y onto a bobbin B to form a package P.

[0030] When the yarn Y is cut in a certain spinning unit 2 or when the yarn Y is broken for some reason, the yarn splicing cart 3 travels to that spinning unit 2 and performs a yarn splicing operation.

[0031] The above-mentioned draft device 6 will be described in more detail. As shown in Figures 2 and 3, the draft device 6 has, in order from the upstream side in the running direction of the sliver S, a back roller pair 14, a third roller pair 15, a middle roller pair 16, and a front roller pair 17.

[0032] The back roller pair 14, as draft rollers for drafting the sliver S, has a back bottom roller (bottom roller) 14a and a back top roller 14b that face each other across a travel path R along which the sliver S travels. The third roller pair 15, as draft rollers for drafting the sliver S, has a third bottom roller (bottom roller) 15a and a third top roller 15b that face each other across the travel path R.

[0033] The middle roller pair 16 has a middle bottom roller 16a and a middle top roller 16b that face each other across the travel path R. An apron belt 18a is hung on the middle bottom roller 16a. An apron belt 18b is hung on the middle top roller 16b. The front roller pair 17 has a front bottom roller 17a and a front top roller 17b that face each other across the travel path R as draft rollers that draft the sliver S. The back bottom roller 14a, the third bottom roller 15a, the middle bottom roller 16a, and the front bottom roller 17a are rotated by a drive motor provided in the second end frame 5 or a drive motor provided in each spinning unit 2.

[0034] The multiple roller pairs 14, 15, 16, and 17 run the sliver S supplied from a can (not shown) from the upstream side to the downstream side while drafting it. Hereinafter, the direction along the running path R will be referred to as the "draft direction." The upstream side in the draft direction will be simply referred to as the "upstream side," and the downstream side in the draft direction will be simply referred to as the "downstream side."

[0035] The back bottom roller 14a is rotatably supported by a back roller housing 61. The third bottom roller 15a is rotatably supported by a third roller housing 62. The middle bottom roller 16a is rotatably supported by a middle roller housing 63. The front bottom roller 17a is rotatably supported by a front roller housing 64. Each of the roller housings 61, 62, 63, and 64 is attached to the machine frame 20. Each of the bottom rollers 14a, 15a, 16a, and 17a is rotated at a different rotational speed so that the roller located downstream rotates faster.

[0036] Each of the top rollers 14b, 15b, 16b, and 17b is rotatably supported by the draft cradle 65. Each of the top rollers 14b, 15b, 16b, and 17b is brought into contact with each of the bottom rollers 14a, 15a, 16a, and 17a at a predetermined pressure and is rotated by the bottom rollers 14a, 15a, 16a, and 17a. Each of the bottom rollers 14a, 15a, 16a, and 17a is made of, for example, iron or other metals. Each of the top rollers 14b, 15b, 16b, and 17b is made of, for example, rubber.

[0037] The draft cradle 65 is provided rotatably about a support shaft 67 at a position where the top rollers 14b, 15b, 16b, and 17b contact the bottom rollers 14a, 15a, 16a, and 17a with a predetermined pressure and at a position where the top rollers 14b, 15b, 16b, and 17b are spaced apart from the bottom rollers 14a, 15a, 16a, and 17a. The draft cradle 65 rotatably supports the top rollers 14b, 15b, 16b, and 17b of the draft devices 6 provided in each of a pair of adjacent spinning units 2.

[0038] A guide member 71 (not shown in FIG. 1) is disposed upstream of the back roller pair 14. The guide member 71 is provided with a through hole 71a through which the sliver S passes. The guide member 71 guides the sliver S supplied from a can (not shown) onto the travel path R.

[0039] A regulating member 72 (omitted in FIG. 1) is disposed between the third roller pair 15 and the middle roller pair 16. The regulating member 72 is provided with a through hole 72a through which the sliver S passes. The regulating member 72 regulates the width of the sliver S to the width of the through hole 72a.

[0040] The back bottom roller 14a is provided with a cleaning device 100 (omitted in FIG. 1). The cleaning device 100 removes fibers adhering to the outer peripheral surface 14c (see FIG. 5) of the back bottom roller 14a. The third bottom roller 15a is also provided with a cleaning device 100 that removes fibers adhering to the outer peripheral surface 14c of the third bottom roller 15a, similar to the back bottom roller 14a.

[0041] A fiber recovery device 80 is disposed on the opposite side of each of the top rollers 14b, 15b, and 16b with respect to each of the bottom rollers 14a, 15a, and 16a (omitted in FIG. 1). As shown in FIG. 3, the fiber recovery device 80 includes a main body 81. A suction passage 82 is provided in the main body 81. The main body 81 is also provided with a suction port 83. In FIG. 3, a part of the main body 81 is cut away to show the suction port 83. Only one suction port 83 is provided for the draft device 6, and faces the third bottom roller 15a.

[0042] A suction pipe 90 is connected to the downstream side of the suction path 82 (the end opposite to the suction port 83). The suction pipe 90 is connected to a blower (not shown) that generates a suction air flow. As a result, the fiber pieces generated in the draft device 6 are sucked through the suction port 83, pass through the suction path 82 and the suction pipe 90, and reach a fiber discharge device (not shown) provided near the blower.

[0043] Next, the cleaning device 100 will be described in detail. In the following, the cleaning device 100 provided on the back bottom roller 14a will be described as an example. The cleaning device 100 provided on the third bottom roller 15a has the same configuration as the cleaning device 100 provided on the back bottom roller 14a. Fig. 4 is an exploded perspective view of the cleaning device 100. Fig. 5 is a cross-sectional view of the cleaning device 100 cut along a plane perpendicular to the width direction.

[0044] In this specification, the term "width direction" means the "axial direction" of a roller (rotating body) such as the back bottom roller 14a in the draft device 6. The term "height direction" corresponds to the "rotation direction" of a roller (rotating body) such as the back bottom roller 14a in the draft device 6, and means a linear direction projected by the rotation direction in a front view of the scraper 200 (i.e., when viewing the scraper 200 from the center X of the outer circumferential surface 14c). The scraper 200 extends in a long side direction and a short side direction in a front view. The width direction corresponds to the long side direction, and the height direction corresponds to the short side direction. At least one of the width direction d1 and the height direction d2 is shown in each of the figures from FIG. 4 onwards. The width direction d1 and the height direction d2 are perpendicular to each other.

[0045] As shown in Figures 4 and 5, the cleaning device 100 includes a scraper (cleaning device member) 200 and a pressing base part 160 attached to the back side of the scraper 200. The pressing base part 160 has a cover member 110, an inner yoke 120, and two magnets (pressing parts) 140. The cleaning device 100 is attached to the back bottom roller 14a by the magnetic force of the magnets 140 built into the pressing base part 160. An opposing surface 202 of the scraper 200 is disposed opposite the back bottom roller 14a.

[0046] The cover member 110 is a case that houses the magnet 140. The cover member 110 is formed in a box shape that is open on the side facing the back bottom roller 14a. The cover member 110 includes a pair of arms 112, a pair of gripping portions 113, four engagement portions 114, and two screws 115. The cover member 110 is made of, for example, resin.

[0047] The scraper 200 is made of resin. The scraper 200 has a base portion 201 that fits into the pressing base portion 160. The base portion 201 has a substantially rectangular shape and extends long in the width direction (long side direction). A pair of engagement plate portions 206 extending in the width direction d1 are provided on the back surface of the base portion 201 (the surface opposite to the side on which a contact portion 204 described later is provided).

[0048] A metal base plate 111 is attached to the box-shaped cover member 110. A hole through which a screw 115 can be inserted is formed in the base plate 111. The pair of arms 112 extend outward from both ends of the base plate 111 in the width direction d1. Here, as shown in FIG. 2, a stopper 66 is provided on the upper surface of the back roller housing 61. The operator attaches the cleaning device 100 to the back bottom roller 14a while the draft device 6 is stopped. At this time, the arm 112 is disposed upstream of the stopper 66 in the rotation direction dr (see FIG. 5) of the back bottom roller 14a, and the back bottom roller 14a is rotated in the rotation direction dr, so that the arm 112 abuts against the tip of the stopper 66. This prevents the cleaning device 100 from rotating together with the back bottom roller 14a. The cleaning device 100 stays (stops) at a predetermined position in the rotation direction dr of the back bottom roller 14a.

[0049] The pair of gripping parts 113 are parts that are gripped by an operator when removing the cleaning device 100 attached to the back bottom roller 14a. The pair of gripping parts 113 are provided on both ends of the base plate 111 in the width direction d1. The gripping parts 113 extend from the base plate 111 toward the downstream side in the rotation direction dr of the back bottom roller 14a.

[0050] The four engagement portions 114 respectively engage with four engagement holes 206a provided in a pair of engagement plate portions 206. The scraper 200 is fixed to the cover member 110 by snap-fitting. The cover member 110 is attached to the side opposite to the opposing surface 202 of the scraper 200. Since the scraper 200 is fixed to the cover member 110 by snap-fitting, the scraper 200 can be easily attached and detached to and from the cover member 110. Therefore, when the scraper 200 becomes worn, the used scraper 200 can be easily replaced with a new scraper 200.

[0051] The inner yoke 120 changes the direction in which the magnetic force of the magnet 140 acts so that the magnetic force of the magnet 140 acts toward the back bottom roller 14a. The inner yoke 120 is a member having a substantially U-shaped cross section. The inner yoke 120 is arranged so that the open part of the substantially U-shape faces the scraper 200 (in other words, the back bottom roller 14a). The base plate 111 and the inner yoke 120 are fixed to the cover member 110 by two screws 115. The base plate 111 and the inner yoke 120 may be fixed to the cover member 110 by a fixture other than the screws 115.

[0052] The two magnets 140 are disposed between the scraper 200 and the cover member 110. The two magnets 140 are housed in, for example, the cover member 110. The two magnets 140 press the scraper 200 toward the outer circumferential surface 14c of the back bottom roller 14a by the action of the magnets 140 being attracted to the back bottom roller 14a by magnetic force. The magnets 140 are attracted and fixed to the metal inner yoke 120 by magnetic force, and are positioned in the width direction d1 by a resin plate and a nut.

[0053] The scraper 200 extends along the width direction d1 of the back bottom roller 14a, and is pressed against the outer peripheral surface 14c of the rotating back bottom roller 14a by the magnetic force of the magnet 140. The scraper 200 removes fibers adhering to the outer peripheral surface 14c of the back bottom roller 14a by being pressed against the outer peripheral surface 14c of the back bottom roller 14a. The scraper 200 may wear out as a result of being in continuous contact with the back bottom roller 14a. When the scraper 200 wears out, it is removed from the cover member 110 and replaced.

[0054] The opposing surface 202 of the base portion 201 is provided with two contact portions 204 spaced apart in the width direction d1. Each of the two contact portions 204 protrudes from the opposing surface 202. The two contact portions 204 are formed, for example, symmetrically with respect to a central plane perpendicular to the width direction d1. In the scraper 200, the base portion 201 including the opposing surface 202, the engagement plate portion 206, and the two contact portions 204 are integrally molded, for example, by injection molding. That is, the opposing surface 202 and the two contact portions 204 are integrally molded.

[0055] As shown in Fig. 6, a bottom wall portion 207 is provided at the end of the base portion 201 on the downstream side in the rotation direction dr. The bottom wall portion 207 is provided at a position including approximately the center of the base portion 201 in the width direction d1. An intermediate flat portion 203 is formed between the two contact portions 204 on the opposing surface 202. The intermediate flat portion 203 is continuous with the bottom wall portion 207. The intermediate flat portion 203 and the bottom wall portion 207 are provided at a position including an area through which the fibers wound around the outer circumferential surface 14c of the back bottom roller 14a pass when the back roller pair 14 drafts the sliver S in the width direction d1.

[0056] As shown in Figs. 4 to 6, the scraper 200 includes an edge portion 208 for removing fibers attached to the outer peripheral surface 14c of the back bottom roller 14a. The edge portion 208 is provided at the end of the base portion 201 on the upstream side of the rotation direction dr of the back bottom roller 14a. The edge portion 208 extends linearly in the width direction d1 (long side direction of the scraper 200). The edge portion 208 is in line contact with the outer peripheral surface 14c of the back bottom roller 14a along the width direction d1. As shown in Figs. 4 and 5, the contact portion 204 is continuous with the protrusions 205 formed on both sides of the low wall portion 207 in the width direction d1. The contact portion 204 terminates midway without reaching the edge portion 208, and two recesses 209 are formed between the contact portion 204 and the edge portion 208. The surface of the recesses 209 is smoothly (without steps) connected to the opposing surface 202.

[0057] 4 to 6, each of the two contact portions 204 has a first portion 210 that is, for example, rectangular in front view, and two second portions 220 that are connected to the first portion 210 in both of the height directions d2. Each of the two second portions 220 is also, for example, rectangular in front view. Each of the contact portions 204 is substantially cross-shaped.

[0058] As shown in FIG. 5, the first surface 210a of the first portion 210 and the second surface 220a of the second portion 220 are arc-shaped with the same radius of curvature and the same center in a cross section perpendicular to the width direction d1. The centers of curvature of the first surface 210a and the second surface 220a approximately coincide with the center X of the back bottom roller 14a when the scraper 200 is in contact with the back bottom roller 14a. That is, the first portion 210 and the second portion 220 have the same radius of curvature as the outer peripheral surface 14c so as to fit the outer peripheral surface 14c of the back bottom roller 14a. The first surface 210a and the second surface 220a are contact surfaces that form part of the cylindrical surface of one cylinder (virtual cylinder).

[0059] In the scraper 200, the second portion 220, which is a planar protrusion, functions effectively in terms of dispersing the pressing force. Below, features of the shape and arrangement of the first portion 210 and the second portion 220 in the contact portion 204 will be described. Fig. 7 is a front view showing the outline of the contact portion 204 in the scraper 200. The outline shown in Fig. 7 corresponds to the intersection line (ridge line) between the inclined surface and the first surface 210a and the second surface 220a, excluding the tapered inclined surface where the contact portion 204 rises from the opposing surface 202.

[0060] 7, in the first portion 210, the width A in the width direction d1 is greater than the height H in the height direction d2. The width B in the width direction d1 of the connection portion 222 of the second portion 220 to the first portion 210 is 30% or more and 50% or less of the width A of the first portion 210.

[0061] In the width direction d1 of the scraper 200, the separation distance D between the two second portions 220 is 2 to 2.5 times the separation distance C between the two first portions 210. The two second portions 220 are widely separated from each other in the width direction d1. This configuration reliably ensures a gap necessary for the sliver S to pass through.

[0062] Moreover, the two magnets 140 are spaced apart in the width direction d1 and disposed at positions corresponding to the two contact portions 204 (particularly the first portions 210). In other words, each magnet 140 is disposed so as to overlap at least a portion of each first portion 210 in a front view. With this configuration, the cleaning device 100 can apply an appropriate pressing force at an appropriate position or region by the two magnets 140 corresponding to the two contact portions 204.

[0063] In each of the two contact portions 204, the second portion 220 is disposed outward from the center in the width direction d1 of the first portion 210. This configuration makes it easier to separate the two second portions 220, and makes it easier to ensure the gap required for the sliver S to pass through.

[0064] According to the cleaning device 100 for the back bottom roller 14a of this embodiment, the second portion 220 connected to the first portion 210 is provided at each of the two contact portions 204 spaced apart in the width direction d1. The width B of the connection portion 222 of the second portion 220 to the first portion 210 is 30% or more and 50% or less of the width A of the first portion 210, and the width of the connection portion 222 is wide. Therefore, the force applied to the outer peripheral surface 14c of the back bottom roller 14a is distributed over a wide range of the entire first portion 210 and the second portion 220. This makes it possible to reduce local contact with the outer peripheral surface 14c of the back bottom roller 14a.

[0065] The first surface 210a and the second surface 220a are arc-shaped with the same radius of curvature and the same center in a cross section perpendicular to the width direction d1. This allows the second surface 220a of the second portion 220, together with the first surface 210a of the first portion 210, to stably contact the outer circumferential surface 14c of the back bottom roller 14a. This allows the force to be more suitably distributed.

[0066] Each of the contact portions 204 has a substantially cross shape, which increases the contact area with the back bottom roller 14a and enhances the effect of dispersing force.

[0067] The facing surface 202 and the contact portion 204 are integrally formed. As a result, even if the contact portion 204 receives a frictional force from the back bottom roller 14a, the position of the contact portion 204 with respect to the facing surface 202 will not shift.

[0068] According to this cleaning device 100, the contact portion 204 of the scraper 200 is pressed against the outer peripheral surface 14c of the back bottom roller 14a by the magnetic force of the magnet 140. The force acting on the outer peripheral surface 14c of the back bottom roller 14a is dispersed over a wide range of the entire first portion 210 and the second portion 220, so that localized contact with the outer peripheral surface 14c of the back bottom roller 14a can be reduced.

[0069] When the scraper 200 is applied to the third bottom roller 15a, the same operational effects as those described above are achieved.

[0070] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

[0071] One magnet 140 may be disposed at the center in the width direction d1. One magnet 140 is disposed so as to overlap at least a part of the two first portions 210 in a front view. In this case, the cleaning device 100 can apply a pressing force to the back bottom roller 14a (or the third bottom roller 15a) by the one magnet 140 via the two contact portions 204 in correspondence with the two contact portions 204. This can simplify the configuration.

[0072] In the width direction d1, the separation distance D between the two second portions 220 may be less than twice the separation distance C between the two first portions 210, or may be more than 2.5 times the separation distance C between the two first portions 210.

[0073] The contact portion 204 may take various modified forms. For example, as shown in FIG. 8, a scraper 200A having two contact portions 204 each having a substantially T-shape rather than a cross shape may be employed. In this scraper 200A, the width A is also greater than the height H in the first portion 210. The width B of the connection portion 222 of the second portion 220 to the first portion 210 is 30% or more and 50% or less of the width A of the first portion 210. In addition, the separation distance D between the two second portions 220 is 2 times or more and 2.5 times or less of the separation distance C between the two first portions 210.

[0074] As shown in FIG. 9, each of the two contact portions 204 is cross-shaped, but the height H of the first portion 210 does not have to be constant. Specifically, in the width direction d1, the end of the first portion 210 located on the center side of the scraper 200B is defined as the first end, and the end located on the opposite side of the first end (i.e., the outside of the scraper 200) is defined as the second end. In this case, the height Ha of the first end of the first portion 210 is smaller than the height H of the second end. In this scraper 200B as well, the width A of the first portion 210 is larger than the heights H and Ha. The width B of the connection portion 222 of the second portion 220 relative to the first portion 210 is 30% or more and 50% or less of the width A of the first portion 210. In addition, the separation distance D between the two second portions 220 is 2 times or more and 2.5 times or less than the separation distance C between the two first portions 210.

[0075] These scrapers 200A and 200B also provide the same effects as the scraper 200. In addition to the above, the second portion 220 may be connected to only one of the first portions 210 in the height direction d2. The width of the second portion 220 in the width direction d1 may increase as it moves away from the first portion 210 in the height direction d2. The outer outline (ridge) of the second portion 220 in the width direction d1 may be inclined with respect to the height direction d2. The inner outline (ridge) of the second portion 220 in the width direction d1 may also be inclined with respect to the height direction d2 as long as it prevents the sliver S from getting caught (as long as it allows the sliver S to pass smoothly).

[0076] The scraping force can be reduced by increasing the contact area of ​​the contact portion 204 with the draft roller. The surface area of ​​the contact portion 204, or the area of ​​the second surface 220a of the second portion 220, may be determined in consideration of the lifespan of the resin material.

[0077] Instead of the above configuration, the air spinning device may include a pair of air jet nozzles for twisting the fiber bundle in opposite directions.

[0078] In the spinning unit 2, the yarn pooling device 11 has a function of drawing out the yarn Y from the air spinning device 7, but the yarn Y may be drawn out from the air spinning device 7 by a delivery roller and a nip roller. When drawing out the yarn Y from the air spinning device 7 by a delivery roller and a nip roller, a slack tube using suction air flow and / or a mechanical compensator, etc. may be provided instead of the yarn pooling device 11.

[0079] In the spinning unit 2, instead of connecting the two yarn ends using the yarn joining device 26, the yarn Y from the package P may be inserted into the air spinning device 7, and the drafting operation of the draft device 6 and the spinning operation of the air spinning device 7 may be started to connect (piecing) the yarn Y from the air spinning device 7 and the yarn Y of the package P.

[0080] In the spinning machine 1, the devices are arranged in the machine height direction such that the yarn Y supplied at the upper side is wound at the lower side. However, the devices may be arranged such that the yarn Y supplied at the lower side is wound at the upper side.

[0081] In the spinning machine 1, at least one of the bottom rollers of the draft device 6 and the traverse guide 23 are driven by power from the second end frame 5 (i.e., commonly for the multiple spinning units 2). However, each part of the spinning unit 2 (e.g., the draft device, the spinning device, the winding device, etc.) may be driven independently for each spinning unit 2.

[0082] In the running direction of the yarn Y, the tension sensor 9 may be disposed upstream of the yarn monitoring device 8. The unit controller 10 may be provided for each spinning unit 2. In the spinning unit 2, the waxing device 12, the tension sensor 9, and the yarn monitoring device 8 may be omitted. When wax is not applied to the yarn Y, the waxing device 12 does not need to be omitted, and only the wax may be removed from the waxing device 12.

[0083] In Fig. 1, the spinning machine 1 is illustrated as winding a cheese-shaped package P, but it is also possible to wind a cone-shaped package. In the case of a cone-shaped package, slack occurs in the yarn Y due to the traverse of the yarn Y, but the slack can be absorbed by the yarn pooling device 11. The materials and shapes of each component are not limited to those described above, and various materials and shapes can be adopted. [Explanation of symbols]

[0084] 1...spinning machine, 6...draft device, 7...air spinning device, 13...winding device, 14...back roller pair, 14a...back bottom roller (draft roller), 14c...outer circumferential surface, 15...third roller pair, 15a...third bottom roller (draft roller), 16...middle roller pair, 17...front roller pair, 100...cleaning device, 110...cover member, 140...magnet, 200, 200A, 200B...scraper (cleaning device member), 202...opposing surface, 204...contact portion, 210...first portion, 220...second portion, 222...connection portion, S...sliver (fiber bundle), F...fiber bundle, Y...yarn, P...package.

Claims

1. A member for a cleaning device extending in a long side direction and a short side direction, An opposing surface disposed opposite the draft roller; two contact portions protruding from the opposing surface and spaced apart in a width direction corresponding to the long side direction; Each of the contact portions has a first portion whose width in the width direction is greater than its height in a height direction corresponding to the short side direction, and a second portion connected to the first portion at least on one side in the height direction, A member for a cleaning device of a draft roller, wherein a width in the width direction of a connection portion of the second portion to the first portion is 30% or more and 50% or less of a width in the width direction of the first portion.

2. 2 . The member for a cleaning device of a draft roller according to claim 1 , wherein a distance between the two second portions in the width direction is from 2 to 2.5 times a distance between the two first portions.

3. 3. The member for a cleaning device of a draft roller according to claim 1, wherein in each of the contact portions, the second portion is disposed outwardly of a center of the first portion in the width direction.

4. A member for a cleaning device of a draft roller according to any one of claims 1 to 3, wherein a first surface of the first portion and a second surface of the second portion form an arc shape having the same radius of curvature and the same center in a cross section perpendicular to the width direction.

5. A member for a cleaning device of a draft roller according to any one of claims 1 to 4, wherein in each of the contact portions, the second portion is connected to the first portion in both directions in the height direction, and each of the contact portions is approximately cross-shaped.

6. 6. The member for a cleaning device of a draft roller according to claim 1, wherein the opposing surface and the contact portion are integrally formed.

7. A member for a cleaning device of a draft roller according to any one of claims 1 to 6; a cover member attached to the opposite side of the facing surface of the cleaning device member; a cleaning device comprising: one or two magnets disposed between the cleaning device member and the cover member.

8. The cleaning device according to claim 7 , wherein the two magnets are arranged spaced apart from each other in the width direction.

9. The cleaning device according to claim 7 , wherein one of the magnets is disposed at the center in the width direction.

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