EP4332036A1 - Dispositif de mesure de longueur de fil et dispositif tampon de fil à tricoter - Google Patents

Dispositif de mesure de longueur de fil et dispositif tampon de fil à tricoter Download PDF

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Publication number
EP4332036A1
EP4332036A1 EP22795474.0A EP22795474A EP4332036A1 EP 4332036 A1 EP4332036 A1 EP 4332036A1 EP 22795474 A EP22795474 A EP 22795474A EP 4332036 A1 EP4332036 A1 EP 4332036A1
Authority
EP
European Patent Office
Prior art keywords
yarn
rotating member
knitting
length measurement
bobbin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22795474.0A
Other languages
German (de)
English (en)
Inventor
Atsushi Mori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shima Seiki Mfg Ltd
Original Assignee
Shima Seiki Mfg Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shima Seiki Mfg Ltd filed Critical Shima Seiki Mfg Ltd
Publication of EP4332036A1 publication Critical patent/EP4332036A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H61/00—Applications of devices for metering predetermined lengths of running material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a technique of a yarn length measurement device capable of measuring a yarn length of a knitting yarn fed out from a buffer device, and the buffer device for the knitting yarn.
  • Patent Literature 1 discloses such a technique.
  • Patent Literature 1 discloses a technique capable of measuring a pull-out amount when the yarn accumulated on a rotary drum is pulled out.
  • optical sensors are disposed at four locations at intervals of 90 degrees in a circumferential direction around the rotary drum, and each of the optical sensors detects blocking of light by the yarn to be pulled out, thereby measuring the pull-out amount of the yarn.
  • Patent Literature 1 JP 6250274 B2
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a yarn length measurement device and a buffer device for a knitting yarn capable of realizing highly accurate yarn length measurement.
  • a yarn length measurement device includes: a rotating member rotatably provided with respect to a predetermined mounting member; an introduction part that is provided at a position deviated from a rotation axis of the rotating member and introduces a knitting yarn unwound from an upstream side in a yarn feeding direction to a downstream side in the yarn feeding direction; a lead-out part that leads out the knitting yarn introduced from the introduction part to a yarn feeding path on the downstream side in the yarn feeding direction; and a rotation amount detection part that detects a rotation amount of the rotating member.
  • the lead-out part may be provided on a rotation axis of the rotating member.
  • the introduction part may be formed at a position where a shortest distance to the rotation axis is shorter than 20 mm.
  • the rotation amount detection part may include a part to be detected that rotates integrally with the rotating member, and may detect the rotation amount by detecting a change in a surface of the part to be detected accompanying a rotation of the part to be detected.
  • a buffer device includes: the yarn length measurement device according to the present invention; and a bobbin wound and stored with the knitting yarn, the bobbin being disposed on the upstream side in the yarn feeding direction of the yarn length measurement device.
  • directions indicated by arrows U, D, F, B, L, and R in the drawings are defined as an upward direction, a downward direction, a forward direction, a backward direction, a left direction, and a right direction, respectively. Furthermore, in each drawing, for convenience of description, illustration of some members may be appropriately omitted.
  • the flat knitting machine 1 mainly includes needle beds 10, a carriage 20, a yarn path rail 30, a servomotor 40, a yarn upright base 50, a control unit 60, and the yarn feeding device 100.
  • the needle beds 10 illustrated in Fig. 1 are disposed so as to face each other in a front-back direction with a needle bed gap (not illustrated) interposed therebetween.
  • the front and back needle beds 10 are disposed, for example, in an inverted V shape in a side view so as to be inclined upward toward front and back central sides (sides facing each other).
  • Each of the needle beds 10 is provided with a large number of knitting needles 11 arranged along a longitudinal direction (left-right direction) of the needle bed 10.
  • the front and back needle beds 10 can be relatively moved to the left and right when carrying out the transfer (stitch transfer) of stitches with respect to each other.
  • a pair of the front and back carriages 20 is disposed to face the front and back needle beds 10 from above.
  • the front and back carriages 20 are connected by a bridge 20a disposed to straddle a plurality of the yarn path rails 30.
  • Each of the carriages 20 can reciprocate along the longitudinal direction of each of the needle beds 10 by the servomotor 40 (See Fig. 2 ).
  • the carriage 20 is provided with a needle selecting mechanism (not illustrated) and a cam mechanism 21 (See Fig. 2 ) for selectively operating the knitting needles 11 of the needle bed 10.
  • the plurality of yarn path rails 30 illustrated in Fig. 1 are disposed above the needle bed gap so as to extend along the longitudinal direction of the needle bed 10.
  • a yarn carrier 31 that feeds a knitting yarn Y is supported on the yarn path rails 30 so as to be movable.
  • the yarn upright base 50 illustrated in Fig. 1 is provided with a yarn cone 51 around which the knitting yarn Y is wound.
  • the knitting yarn Y from the yarn cone 51 is fed to the yarn carrier 31 through a yarn feeding path A.
  • the yarn feeding path A is a path through which the knitting yarn Y from the yarn cone 51 to the yarn carrier 31 is fed.
  • a top spring 52 is disposed above the yarn cone 51. The top spring 52 applies tension to the knitting yarn Y pulled out from the yarn cone 51 and fed to a downstream side in a yarn feeding direction (a yarn carrier 31 side).
  • the top spring 52 is located on the yarn feeding path A.
  • the control unit 60 illustrated in Fig. 2 is for controlling an operation of the flat knitting machine 1.
  • the control unit 60 includes an arithmetic processing unit such as a CPU, a storage unit such as a RAM and a ROM, and the like.
  • the storage unit of the control unit 60 stores various information, programs, and the like used for controlling the flat knitting machine 1.
  • the control unit 60 is disposed at an appropriate location (for example, in a main body of the flat knitting machine 1 (under the needle bed 10 on the back side)) of the flat knitting machine 1.
  • the control unit 60 is connected to the servomotor 40 and can control an operation of the servomotor 40.
  • the control unit 60 can arbitrarily move the carriage 20 by controlling the operation of the servomotor 40.
  • the control unit 60 can detect a position of the carriage 20 based on the number of rotations of the servomotor 40.
  • the control unit 60 is connected to the carriage 20 (more specifically, the cam mechanism 21), and can control the operation of the carriage 20.
  • the control unit 60 controls each part of the flat knitting machine 1 based on a knitting program and the like created in advance. Specifically, the control unit 60 can reciprocate the carriage 20 along the longitudinal direction of the needle bed 10 by controlling the operation of the servomotor 40. In this case, the knitting operation such as knit, tuck, miss, and the like, and the transfer of the stitches between the front and back needle beds 10 can be carried out by advancing and retreating the knitting needles 11 with respect to the needle bed gap by the cam mechanism 21 and the like mounted on the carriage 20. A knitted fabric K is knitted by repeating such reciprocating movement of the carriage 20.
  • the yarn feeding device 100 stores the knitting yarn Y from the yarn cone 51, and feeds the stored knitting yarn Y to the yarn carrier 31 with a substantially constant tension. As illustrated in Fig. 1 , the yarn feeding device 100 is disposed on a side (left side in the drawing example) of the flat knitting machine 1. The yarn feeding device 100 is located in the yarn feeding path A. Note that, in the drawing example, one yarn feeding device 100 is illustrated, but a plurality of the yarn feeding devices 100 (for example, the number corresponding to the number of yarn carriers 31) can be disposed as necessary.
  • the yarn feeding device 100 mainly includes a support part 110, a buffer device 120, a resistance applying part 130, a yarn length measurement device 200, and a control unit 300.
  • the support part 110 illustrated in Fig. 3 supports the buffer device 120, the yarn length measurement device 200, and the like to be described later.
  • the support part 110 is formed by combining a plurality of plate-shaped members, for example.
  • the support part 110 is installed in an appropriate installation target.
  • the support part 110 includes an upper guide part 111 and a lower guide part 112.
  • the upper guide part 111 is a part into which the knitting yarn Y from the top spring 52 is introduced.
  • the upper guide part 111 has a hole that penetrates in a vertical direction and through which the knitting yarn Y passes.
  • the upper guide part 111 is supported through an appropriate arm protruding rightward from a right surface of the support part 110.
  • the lower guide part 112 is a part from which the knitting yarn Y from the buffer device 120 to be described later is led out.
  • the lower guide part 112 has a hole that penetrates in the vertical direction and through which the knitting yarn Y passes.
  • the lower guide part 112 is supported below the upper guide part 111 through an appropriate arm protruding rightward from the right surface of the support part 110.
  • the buffer device 120 illustrated in Fig. 3 pulls out the knitting yarn Y from the yarn cone 51 and stores the knitting yarn Y.
  • the knitting yarn Y stored in the buffer device 120 is pulled out (fed out) to a downstream side in the yarn feeding direction as necessary.
  • the buffer device 120 is provided on the support part 110 so as to be located between the upper guide part 111 and the lower guide part 112.
  • the buffer device 120 includes a housing 121, a drive unit 122, a winding part 123, and a bobbin 124.
  • the housing 121 accommodates the drive unit 122 to be described later.
  • the housing 121 is fixed to the right surface of the support part 110.
  • the drive unit 122 illustrated in Figs. 2 and 3 drives the winding part 123 to be described later.
  • the drive unit 122 is provided inside the housing 121.
  • the drive unit 122 includes an appropriate drive source (for example, a motor or the like).
  • the winding part 123 illustrated in Fig. 3 winds the knitting yarn Y from the upper guide part 111 around the bobbin 124 to be described later.
  • the winding part 123 is located below the housing 121 and is rotatably provided with respect to the housing 121.
  • the winding part 123 rotates about a rotation axis oriented in the vertical direction by a driving force of the drive unit 122.
  • the winding part 123 rotates clockwise in plan view.
  • the bobbin 124 illustrated in Figs. 3 and 4 can store the knitting yarn Y.
  • the bobbin 124 is formed in a substantially cylindrical shape with an axial direction oriented in the vertical direction.
  • the bobbin 124 is provided in the housing 121 so as to be located below the winding part 123.
  • the bobbin 124 stores the knitting yarn Y by winding the knitting yarn Y around an outer peripheral surface.
  • the knitting yarn Y is wound around the bobbin 124 by the winding part 123 in a constant winding manner (so that the yarn length per turn becomes substantially the same length).
  • the knitting yarn Y stored in the bobbin 124 is pulled out (unwound) with the knitting operation of the flat knitting machine 1 (carriage 20, yarn carrier 31, and the like), and fed toward the downstream side in the yarn feeding direction.
  • a position of the knitting yarn Y unwound from the bobbin 124 changes so as to swing clockwise in plan view along the outer peripheral surface of the bobbin 124.
  • the resistance applying part 130 illustrated in Figs. 3 and 4 applies resistance by friction to the knitting yarn Y pulled out from the bobbin 124.
  • the resistance applying part 130 is disposed below the bobbin 124.
  • the resistance applying part 130 is formed in a shape opened in the vertical direction so that the knitting yarn Y can pass therethrough.
  • the resistance applying part 130 includes a contact part 131, a receiving part 132, and a biasing part 133. Note that, in Figs. 3 and 4 , the resistance applying part 130 is illustrated as a cross-sectional view.
  • the contact part 131 is a part that contacts a lower end part of the bobbin 124.
  • the contact part 131 has a substantially truncated cone shape in which upper and lower sides are reversed, and is formed in a tubular shape that opens upward and downward.
  • the contact part 131 has a surface in contact with the bobbin 124 having an inclined surface shape whose diameter increases upward in cross-sectional view. In the present embodiment, an angle of the inclined surface with respect to the horizontal direction is formed to be about 25 degrees.
  • the contact part 131 is formed of, for example, a film or the like.
  • the receiving part 132 is a part that receives a biasing force of the biasing part 133 to be described later.
  • the receiving part 132 is formed to extend downward from a lower end part of the contact part 131.
  • the receiving part 132 is formed in a substantially tubular shape that opens vertically. An inner diameter of an opening formed in an upper part of the receiving part 132 is smaller than an inner diameter of an opening formed in a lower part.
  • the biasing part 133 biases the receiving part 132 upward.
  • a compression coil spring can be employed as the biasing part 133.
  • An upper end part of the biasing part 133 abuts on the upper part (a part around the opening) of the receiving part 132.
  • a lower end part of the biasing part 133 is supported by the support part 110 through an appropriate member (a rotation support part 220 described later in the present embodiment).
  • the biasing part 133 biases the contact part 131 to press the lower end part of the bobbin 124 through the receiving part 132.
  • the contact part 131 of the resistance applying part 130 is pressed against the lower end part of the bobbin 124 as described above, so that the resistance by friction can be applied to the knitting yarn Y between the contact part 131 and the bobbin 124.
  • a certain degree of tension can be applied to the knitting yarn Y passing between the contact part 131 and the bobbin 124 when the knitting yarn Y is pulled out toward the downstream side in the yarn feeding direction.
  • the knitting yarn Y pulled out from the bobbin 124 can be suppressed from overflowing due to inertia.
  • the resistance applying part 130 (contact part 131, receiving part 132, and biasing part 133) is formed with an opening that allows the knitting yarn Y pulled out from the bobbin 124 to pass therethrough as a whole.
  • the knitting yarn Y applied with the tension by the contact part 131 passes through the opening and is fed to a side of the lower guide part 112.
  • a configuration of providing an appropriate tensioner for removing the slack of the knitting yarn Y pulled out from the lower guide part 112 on the downstream side in the yarn feeding direction of the lower guide part 112 can be adopted. According to this, the loosening of the knitting yarn Y can be absorbed by the tensioner even if the loosening occurs in the knitting yarn Y with the movement of the carriage.
  • the yarn length measurement device 200 illustrated in Figs. 4 to 6 can measure a yarn length of the knitting yarn Y pulled out from the bobbin 124.
  • the yarn length measurement device 200 is disposed below the bobbin 124 (on the downstream side in the yarn feeding direction).
  • the yarn length measurement device 200 includes a rotating member 210, a rotation support part 220, and a rotation amount detection part 230.
  • the rotating member 210 illustrated in Figs. 4 and 5 is rotatably provided with respect to the bobbin 124.
  • the rotating member 210 is formed in a substantially cylindrical shape with an axial direction oriented in the vertical direction. That is, an internal space penetrating in the vertical direction is formed in the rotating member 210.
  • the rotating member 210 is formed to have a relatively small vertical length (For example, the vertical length is smaller than an outer diameter of a disk part 231 to be described later.).
  • the vertical length of the rotating member 210 may be, for example, 50 mm to 100 mm.
  • the rotating member 210 is formed in a shape in which the upper part is larger in diameter than the lower part.
  • a radius of the upper part of the rotating member 210 is formed to be smaller than a radius of a part around which the knitting yarn Y of the bobbin 124 is wound.
  • the rotating member 210 is rotatably supported by the rotation support part 220 described later about a rotation axis B oriented in the vertical direction.
  • the rotation axis B is located at a center of the rotating member 210 in plan view (See Fig. 6(b) ).
  • the rotating member 210 is provided below the bobbin 124.
  • the rotating member 210 is disposed such that the substantially upper half part is located in the opening of the resistance applying part 130 (contact part 131, receiving part 132, and biasing part 133). Furthermore, the rotating member 210 is disposed such that the rotation axis B substantially coincides with the center in plan view of the bobbin 124 in plan view.
  • the rotating member 210 includes an introduction part 211 and a lead-out part 212.
  • the introduction part 211 introduces the knitting yarn Y from the bobbin 124 to the downstream side in the yarn feeding direction.
  • the introduction part 211 is formed so as to open in the horizontal direction at the upper part of the rotating member 210.
  • the introduction part 211 is formed so as to communicate the outer peripheral surface of the upper part of the rotating member 210 and the internal space of the rotating member 210.
  • the introduction part 211 is provided at a position deviated from the rotation axis B. More specifically, the introduction part 211 is located radially outside the rotation axis B. In the present embodiment, a shortest distance L (radial distance) from the introduction part 211 to the rotation axis B is formed to be shorter than 20 mm.
  • the shortest distance L is a distance from a part of the introduction part 211 located outermost with respect to the rotation axis B (an outer peripheral surface of the upper part of the rotating member 210) to the rotation axis B.
  • the shortest distance L is the radius of the upper part of the rotating member 210.
  • the lead-out part 212 leads out the knitting yarn Y introduced from the introduction part 211 to the yarn feeding path A on the downstream side in the yarn feeding direction.
  • the lead-out part 212 is formed to open downward at the lower end part of the rotating member 210.
  • the lead-out part 212 communicates with the internal space of the rotating member 210 and is provided on the rotation axis B.
  • the rotation support part 220 illustrated in Figs. 4 and 6(a) rotatably supports the rotating member 210 about the rotation axis B.
  • the rotation support part 220 includes a through hole penetrating in the vertical direction, and a lower part of the rotating member 210 is inserted into the through hole.
  • the rotation support part 220 includes an appropriate bearing (not illustrated) for smoothly rotating the rotating member 210.
  • the rotation support part 220 is fixed to the right surface of the support part 110 so as to be located below the resistance applying part 130.
  • a recess capable of holding a lower end part of the biasing part 133 is formed on an upper surface of the rotation support part 220.
  • the rotation amount detection part 230 illustrated in Figs. 4 and 6 can detect a rotation amount of the rotating member 210.
  • the rotation amount detection part 230 is accommodated in the rotation support part 220.
  • the rotation amount detection part 230 includes a disk part 231 and a sensor unit 232.
  • the disk part 231 rotates integrally with the rotating member 210.
  • the disk part 231 is formed in a substantially disk shape with a thickness direction oriented in the vertical direction.
  • the disk part 231 is fixed to the rotating member 210 in a state where the rotating member 210 is inserted through an opening part at the center in plan view.
  • an appropriate slit 231a is formed on a surface of the disk part 231. Note that, in Fig. 6(b) , the slit 231a is illustrated in a part of the surface of the disk part 231, but the slit 231a is formed over substantially the entire surface (entire circumference) of the disk part 231.
  • the sensor unit 232 can detect a change in the surface of the disk part 231 accompanying the rotation of the disk part 231.
  • the sensor unit 232 constitutes an optical encoder.
  • the sensor unit 232 is an optical sensor capable of detecting a change in the surface of the disk part 231 by detecting passage of light (for example, infrared rays) through the slit 231a of the disk part 231 and shielding of light by a part other than the slit 231a.
  • the rotation amount of the disk part 231 (rotating member 210) can be detected by using a detection result of the sensor unit 232.
  • the sensor unit 232 is not limited to one that detects a change in the surface of the disk part 231 by detecting passage or shielding of light, and one that detects a change in the surface of the disk part 231 by detecting reflection of light applied to the surface of the disk part 231 can be adopted. Furthermore, the sensor unit 232 is not limited to one that constitutes an optical encoder, and may constitute an encoder of another type such as a magnetic type. Specifically, the sensor unit 232 is not limited to an optical sensor, and various sensors capable of detecting a change in the surface of the disk part 231, such as a magnetic sensor, can be adopted.
  • the sensor unit 232 is not limited to one that constitutes an encoder, and may constitute another detection device that can detect a change in the surface of the disk part 231.
  • the sensor unit 232 may not necessarily detect a change in the surface of the disk part 231 as long as it can detect the rotation amount of the disk part 231.
  • the control unit 300 illustrated in Fig. 2 is for controlling the operation of the yarn feeding device 100.
  • the control unit 300 includes an arithmetic processing unit such as a CPU, a storage unit such as a RAM and a ROM, and the like.
  • the storage unit of the control unit 300 stores various information, programs, and the like used for controlling the yarn feeding device 100.
  • the control unit 300 is connected to the drive unit 122 of the buffer device 120 and can control the operation of the drive unit 122. Furthermore, the control unit 300 is connected to the rotation amount detection part 230 (sensor unit 232), and can acquire a detection result of the sensor unit 232.
  • the control unit 300 is communicably connected to the control unit 60, and can exchange information with the control unit 60. Note that, in the present embodiment, an example has been described in which the control unit 300 and the control unit 60 are separated, but instead of such a configuration, the control unit 300 and the control unit 60 may be integrally configured.
  • the control unit 300 stores the knitting yarn Y in the buffer device 120. As illustrated in Fig. 3 , the control unit 300 pulls out the knitting yarn Y from the yarn cone 51 and winds and stores the knitting yarn Y around the bobbin 124 by driving the drive unit 122 (winding part 123). At this time, the control unit 300 can wind a constant amount of the knitting yarn Y around the bobbin 124 by controlling the operation of the winding part 123 based on the yarn length per turn of the knitting yarn Y wound around the bobbin 124, a driving amount of the drive unit 122, and the like. Note that as the yarn length per turn of the knitting yarn Y, an appropriate value may be input to the control unit 300, or may be calculated by the control unit 300 using information such as a circumference, a diameter, and the like of the bobbin 124 stored in advance.
  • the knitting yarn Y stored in the bobbin 124 is pulled out from the bobbin 124 with the knitting operation of the flat knitting machine 1.
  • the yarn length of the knitting yarn Y pulled out from the bobbin 124 is measured by the yarn length measurement device 200. Note that the measurement of the yarn length by the yarn length measurement device 200 will be described later.
  • the control unit 300 acquires a measurement result of the yarn length of the knitting yarn Y pulled out from the bobbin 124, and drives the drive unit 122 (winding part 123) based on the measurement result of the yarn length to pull out and wind the knitting yarn Y around the bobbin 124.
  • a constant amount of the knitting yarn Y can be stored in the bobbin 124 by winding the knitting yarn Y of the length of the pulled out part around the bobbin 124.
  • the rotating member 210 rotates clockwise in plan view with the operation of the knitting yarn Y. More specifically, when the knitting yarn Y wound around the bobbin 124 is pulled out, the position of the knitting yarn Y unwound from the bobbin 124 changes so as to swing clockwise in plan view along the outer peripheral surface of the bobbin 124. With such an operation of the knitting yarn Y, the introduction part 211 of the rotating member 210 provided at a position deviated from the rotation axis B is pressed against the knitting yarn Y (See Fig. 6(a) ). As a result, the rotating member 210 rotates clockwise in plan view about the rotation axis B.
  • the rotation amount detection part 230 detects a change in the surface of the disk part 231 that rotates integrally with the rotating member 210.
  • the control unit 300 acquires a detection result of the rotation amount detection part 230, and measures the yarn length pulled out from the bobbin 124 based on the detection result.
  • the control unit 300 can measure the yarn length pulled out from the bobbin 124 by, for example, performing calculation using the rotation amount of the rotating member 210 (the number of turns of the knitting yarn Y pulled out from the bobbin 124) and the yarn length per turn of the knitting yarn Y wound around the bobbin 124.
  • the control unit 300 can store the measured yarn length. Furthermore, the control unit 300 can measure the yarn length consumed for each knitting operation (e.g., per loop length) based on the information relating to the number of rotations of the servomotor 40 and the operation of the carriage 20 acquired from the control unit 60.
  • the yarn feeding device 100 configured as described above can realize the yarn length measurement with high accuracy. That is, for example, in the yarn feeding device in which the optical sensors are disposed at four locations at equal intervals in the circumferential direction around the bobbin 124, the pull-out amount of the knitting yarn Y can be measured by detecting the blocking of the light by the knitting yarn Y to be pulled out by each optical sensor.
  • the yarn passing between the optical sensors cannot be detected, and thus there is room for improvement in the accuracy of the yarn length measurement.
  • it is conceivable to increase the number of optical sensors for the purpose of improving the accuracy of the yarn length measurement but in this case, it is conceivable that the cost increases.
  • the rotating member 210 is rotated by the operation of the knitting yarn Y led out to the yarn feeding path A on the downstream side in the yarn feeding direction, and thus the yarn length measurement with high accuracy can be realized by detecting the rotation amount of the rotating member 210.
  • the configuration described above can realize the yarn length measurement with high accuracy with a simpler configuration than, for example, the configuration of increasing the number of optical sensors that detect the knitting yarn Y.
  • the accuracy of the yarn length measurement can be improved while suppressing the increase in cost.
  • the dimension in the radial direction of the rotation amount detection part 230 can be reduced as compared with the case of providing the optical sensors around the bobbin 124, and the compactness of the device can be achieved.
  • the lead-out part 212 of the rotating member 210 is provided on the rotation axis B.
  • a load on the knitting yarn Y passing through the internal space of the rotating member 210 can be reduced.
  • the introduction part 211 of the rotating member 210 is formed at a position where the shortest distance L to the position on the rotation axis B is relatively short (shorter than 20 mm).
  • the rotating member 210 can be easily suppressed from continuing rotating due to inertia, and the yarn length measurement with higher accuracy can be realized.
  • the yarn length measurement with higher accuracy can be realized by detecting the change in the surface of the disk part 231 (rotation amount detection part 230) integrally rotating with the rotating member 210 by the operation of the knitting yarn Y.
  • the disk part 231 according to the present embodiment is an embodiment of a part to be detected according to the present invention.
  • rotation support part 220 is an embodiment of a predetermined mounting member according to the present invention.
  • the introduction part 211 of the rotating member 210 is formed at a position where the shortest distance L to the position on the rotation axis B is shorter than 20 mm has been described, but the present invention is not limited thereto. That is, the shortest distance L may be 20 mm or more.
  • the contact part 131 of the resistance applying part 130 is formed such that the angle of the inclined surface with respect to the horizontal direction in the cross-sectional view is about 25 degrees
  • the angle of the inclined surface with respect to the horizontal direction may be formed to be a larger angle (for example, approximately 45 degrees).
  • the angle of the inclined surface with respect to the horizontal direction may be formed to be smaller than 25 degrees.
  • the contact part 131 of the resistance applying part 130 is formed in a substantially truncated cone shape in which the upper and lower sides are reversed has been described, but the present invention is not limited thereto.
  • the contact part 131 may be formed in a substantially disk shape. In this case, an upper surface of the disk is brought into contact with a lower end surface of the bobbin 124. Furthermore, in this case, an opening through which the knitting yarn Y from the bobbin 124 can pass is formed at the center of the disk.
  • a rotating member 210A according to a second embodiment illustrated in Fig. 7(a) is different from the rotating member 210 according to the first embodiment in the configuration of an introduction part 211. Furthermore, the rotating member 210A is formed to have a larger dimension in the vertical direction than the rotating member 210 according to the first embodiment.
  • the rotating member 210A is formed such that the introduction part 211 opens obliquely upward.
  • the rotating member 210A is cut out such that a part of an upper outer peripheral surface faces obliquely upward, and the introduction part 211 is formed on a surface facing the upward direction.
  • a lead-out part 212 of the rotating member 210A is located on a rotation axis B of the rotating member 210B, and the introduction part 211 is located radially outside the rotation axis B.
  • the knitting yarn Y can be easily introduced to the introduction part 211 even in a case where a distance between the bobbin 124 and the rotating member 210A becomes large.
  • a rotating member 210B according to a third embodiment illustrated in Fig. 7(b) is formed in a substantially cylindrical shape with an axial direction oriented in the vertical direction.
  • an introduction part 211 is formed so as to open upward on the upper surface
  • a lead-out part 212 is formed so as to open downward on the lower surface.
  • the lead-out part 212 is located on a rotation axis B of the rotating member 210B, and the introduction part 211 is located radially outside the rotation axis B.
  • the rotating member 210B is formed with a path inclined with respect to the vertical direction so as to communicate the introduction part 211 and the lead-out part 212.
  • a rotating member 210C according to a fourth embodiment illustrated in Fig. 7(c) is formed of a plate-shaped member bent in a substantially L shape.
  • an introduction part 211 is formed so as to penetrate a plate surface facing the horizontal direction
  • a lead-out part 212 is formed so as to penetrate a plate surface facing the vertical direction.
  • the lead-out part 212 is located on a rotation axis B of the rotating member 210C, and the introduction part 211 is located radially outside the rotation axis B. According to the above configuration, the rotating member 210C can be formed relatively easily by making a hole in the plate-shaped member.
  • a rotating member 210D according to a fifth embodiment illustrated in Fig. 8(a) includes a rotating body 213 provided rotatably about a rotation axis B with respect to a bobbin 124, and an arm 214 extending in a horizontal direction from the rotating body 213.
  • the rotating body 213 is rotatably supported by an appropriate member (for example, the rotation support part 220).
  • An introduction part 211 of the rotating member 210D is formed in a tubular shape opening in the vertical direction, and is provided at a distal end of the arm 214.
  • a lead-out part 212 of the rotating member 210D is formed in a tubular shape opening in the vertical direction, and is provided on the rotation axis B below the rotating body 213. Note that although the lead-out part 212 is schematically illustrated in the drawing example, the lead-out part 212 is integrally formed with the rotating member 210D. As the rotating member 210D according to the fifth embodiment, a rotation amount detection part 230 (encoder) similar to that of the first embodiment can be used.
  • a rotating member 210E according to a sixth embodiment illustrated in Fig. 8(b) is different from the rotating member 210D according to the fifth embodiment in the configuration of an introduction part 211.
  • the rotating member 210E is formed in a hook shape in which the introduction part 211 can hook a knitting yarn Y. According to the above configuration, the knitting yarn Y can be easily introduced to the introduction part 211.
  • the rotating member in which the lead-out part 212 is provided on the rotation axis B and the introduction part 211 is provided at a position deviated from the rotation axis B.
  • the second to sixth embodiments have substantially the same effects as those of the first embodiment of the present invention.
  • the buffer device 120 and the yarn length measurement device 200 are formed separately, but the present invention is not limited thereto. That is, the buffer device 120 and the yarn length measurement device 200 may be integrally formed. In this case, for example, a configuration in which the yarn length measurement device 200 is provided on the bobbin 124 can be adopted. Furthermore, in a case where the yarn length measurement device 200 is provided on the bobbin 124, for example, a configuration in which the lead-out part of the rotating member 210D according to the fifth embodiment and the lead-out part 212 of the rotating member 210E according to the sixth embodiment illustrated in Fig. 8 are formed as separate members from the introduction part 211 can be adopted. In this case, the lead-out part 212 may be rotatably supported by an appropriate member or may be non-rotatably supported.
  • the lead-out part 212 of the rotating member 210 is provided on the rotation axis B, but the present invention is not limited thereto. That is, the lead-out part 212 may be provided at a position deviated from the rotation axis B. However, from the viewpoint of reducing the load on the knitting yarn Y, the lead-out part 212 is desirably provided at a position close to the rotation axis B.
  • the flat knitting machine 1 has been described as an example of the knitting machine, but the present invention is not limited thereto, and can be applied to other various knitting machines (for example, circular knitting machine, warp knitting machine, and the like). That is, the yarn feeding device 100 according to the present embodiments can be disposed in the yarn feeding path A of various knitting machines.
  • control unit 300 provided in the yarn feeding device 100
  • the present invention is not limited thereto. That is, some or all of the functions of the control unit 300 can be executed by a control unit (for example, a personal computer or the like) provided separately from the yarn feeding device 100.
  • the measurement of the yarn length can be executed by a PC disposed outside the flat knitting machine 1 or the control unit 60.
  • the present invention can be applied to a yarn length measurement device capable of measuring a yarn length of a knitting yarn fed out from a buffer device, and a buffer device for the knitting yarn.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Knitting Machines (AREA)
EP22795474.0A 2021-04-28 2022-03-29 Dispositif de mesure de longueur de fil et dispositif tampon de fil à tricoter Pending EP4332036A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021075968 2021-04-28
PCT/JP2022/015484 WO2022230558A1 (fr) 2021-04-28 2022-03-29 Dispositif de mesure de longueur de fil et dispositif tampon de fil à tricoter

Publications (1)

Publication Number Publication Date
EP4332036A1 true EP4332036A1 (fr) 2024-03-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22795474.0A Pending EP4332036A1 (fr) 2021-04-28 2022-03-29 Dispositif de mesure de longueur de fil et dispositif tampon de fil à tricoter

Country Status (5)

Country Link
EP (1) EP4332036A1 (fr)
JP (1) JPWO2022230558A1 (fr)
KR (1) KR20240004637A (fr)
CN (1) CN117242027A (fr)
WO (1) WO2022230558A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5924058B2 (ja) * 1977-12-08 1984-06-06 東レ株式会社 貯溜給糸装置
DE3238376C2 (de) * 1982-10-16 1984-08-09 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Fadenspeicher
JP2010047407A (ja) * 2008-08-25 2010-03-04 Murata Machinery Ltd 糸巻取装置及びそれを備える自動ワインダ
ITMI20112046A1 (it) 2011-11-11 2013-05-12 Btsr Int Spa Dispositivo alimentatore di filo ad accumulo perfezionato

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JPWO2022230558A1 (fr) 2022-11-03
KR20240004637A (ko) 2024-01-11
WO2022230558A1 (fr) 2022-11-03
CN117242027A (zh) 2023-12-15

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