JP2009155776A - Needle selector of flat knitting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle selector of a flat knitting machine with a swinging type actuator hardly causing malfunction due to metal powder and caused when organizing operation. <P>SOLUTION: The needle selector comprises a cylindrical bobbin 10, an excitation coil 11 set at the bobbin 10, a lever 30 whose one end is projected outside from the bobbin 10 and the other end is pivoted in the bobbin 10, and magnetic elements (a side yoke 22 and a side yoke 29) oppositely set to place the lever therebetween at the one end side of the lever 30. The lever 30 is swung between the both side yokes 22 and 29 by electromagnetic power generated by excitation of an excitation coil 11, and needle selection of the knitting needle is performed by swinging of the lever 30. And the lever 30 has a covering part 41 covering from the outside the spaces formed between the lever 30 and the both side yokes 22 and 29. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a needle selection device for a flat knitting machine. In particular, the present invention relates to the selection of a flat knitting machine that can reduce the possibility of malfunction due to the metal powder generated during the knitting operation of the flat knitting machine entering the inside of an oscillating actuator provided in the needle selection device. It relates to a needle device.

  The flat knitting machine includes a needle bed and a carriage that reciprocates in the longitudinal direction of the needle bed. During knitting, a plurality of knitting needles arranged in the needle bed are advanced and retracted in the longitudinal direction of the needle groove by a knitting cam provided in the carriage. Knit the fabric. The knitting needle usually has a needle body having a hook, and a needle jack, a selector, and a select jack for advancing and retracting the needle body as necessary. The knitting operation by the knitting needle is based on three types, knit, tack, and miss. The knitting operation to be performed by the knitting needle is determined based on the needle selection bat provided in the selector by the needle selection device mounted on the carriage. It is determined by whether or not it is submerged.

  Conventionally, a swing type actuator has been used as the needle selection device of the flat knitting machine. As a typical oscillating actuator, for example, the one described in Patent Document 1 is known. As shown in FIGS. 1 to 3 of this document, this oscillating actuator surrounds the outside of the exciting coil with a ferromagnetic yoke and a side yoke, and is a ferromagnetic lever that can oscillate inside the bobbin of the exciting coil. In which both ends of the yoke and the side yoke are opposed to each other near both ends of the lever, and a permanent magnet is sandwiched between the other ends of the yoke and the side yoke. The lever of the oscillating actuator is attracted to the side yoke side by the magnetic force of the permanent magnet when the excitation coil is not energized, and when the excitation coil is energized, the excitation coil is energized so that one end side of the yoke Has been drawn to. That is, the oscillating actuator includes a configuration in which the lever is oscillated toward one end of the yoke or the side yoke depending on whether or not the excitation coil is energized.

  An actuator cam that directly acts on a needle selection bat provided in the selector is engaged with the tip of the lever of the above-described swing type actuator, and the actuator cam swings when the lever swings. If the oscillated actuator cam is at the position of the needle selection bat of the selector, the actuator cam presses the needle selection butt and sinks into the needle groove (non-needle selection state). Conversely, if the actuator cam is retracted from the position of the needle selection bat, the needle selection bat is not submerged in the needle groove (needle selection state).

JP-A-6-29118

  By the way, most of the members related to the knitting such as the carriage (knitting cam), the knitting needle, and the needle bed are made of iron-based metal, and when these members come into contact with each other, fine metal powder may be generated. is there. If this metal powder enters the inside of the oscillating actuator through the gap between the lever and the yoke or the gap between the lever and the side yoke, the oscillating actuator becomes unstable due to the disturbance of its magnetic circuit, There is a risk of needle selection mistakes. As described in Patent Document 1, the swinging actuator provided in the flat knitting machine is arranged with the lever facing downward. There is a risk of intrusion.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a needle selection device for a flat knitting machine that is unlikely to cause malfunction due to metal powder generated during knitting operation.

  The present invention relates to a cylindrical bobbin, an exciting coil disposed on the bobbin, a lever having one end protruding outward from the bobbin and the other end pivotally supported in the bobbin, and a lever sandwiched between one end of the lever. And a magnetic member arranged opposite to each other, and the lever is oscillated between the magnetic members by the electromagnetic force generated by the excitation of the excitation coil. According to the needle device. The needle selection device for a flat knitting machine according to the present invention is characterized in that a lever provided in the needle selection device includes a cover portion that covers a gap formed between the lever and both magnetic members from the outside of the gap.

  The cover provided on the lever need not be provided so as to seal the gap, and has a size that does not interfere with the swinging of the lever. What is necessary is just to have a magnitude | size which cannot see the said clearance gap irrespective of a rocking | fluctuation position. As a preferable shape of such a cover part, it is mentioned to make it circular arc shape substantially along the rocking locus of the lever.

  Since the needle selection device of the flat knitting machine of the present invention has a cover portion that covers the gap between the lever and the two magnetic members facing each other with the lever interposed therebetween, the lever from the outside of the needle selection device via this gap It is possible to prevent foreign matter such as metal powder from entering a portion constituting a magnetic circuit for swinging the magnetic circuit. As a result, the malfunction of the needle selection device due to the disturbance of the magnetic circuit can be suppressed, so that a needle selection error can be effectively prevented. Furthermore, in recent years, it has been desired to increase the knitting speed, and there is a concern that the generation of metal powder and the like due to contact between members related to knitting such as knitting cams, knitting needles, and needle beds increases. Even if the generation of metal powder increases, the cover portion can effectively prevent malfunction of the needle selection device.

  In addition, if the shape of the cover provided on the lever is formed in an arc shape substantially along the swing trajectory of the lever, it is effective not only from the axial direction of the lever but also from the intrusion of foreign matter from the lever swing side. Can be prevented.

  Embodiments of the present invention will be described below with reference to the drawings. First, the needle selection of the knitting needle in the flat knitting machine will be schematically described, and then the needle selection device of the flat knitting machine will be described in detail.

  FIG. 1 is a schematic explanatory diagram of a needle selection operation of a knitting needle by a needle selection device of a flat knitting machine. 2A is a top view of the needle selection device, FIG. 2B is a view taken along the line XX in FIG. 2A, and FIG. 2C is an outline of an actuator cam provided in the needle selection device. FIG. Note that FIG. 1 illustrates a state in which the needle selection device illustrated in FIG.

  A flat knitting machine knitting a knitted fabric with a knitting needle configured by combining a plurality of members (needle body, needle jack, selector and select jack) based on three knitting operations of knit, tack and miss. The knitting needles are arranged in a needle groove on the needle bed, and perform either knitting or tucking by moving back and forth in the longitudinal direction of the needle groove. Further, since the knitting needle does not advance or retreat in the longitudinal direction of the needle groove, the knitting operation becomes a mistake. In FIG. 1, only the selectors 51 to 58 are shown among the members constituting the knitting needle, and any of the above is determined depending on whether or not the needle selection bats 61 to 68 provided in the selectors 51 to 58 are submerged in the needle groove. (For details of the knitting operation, refer to, for example, Japanese Patent Laid-Open No. 1-104863).

  On the other hand, whether or not the needle selection bats 61 to 68 of the selectors 51 to 58 are depressed is determined by the needle selection device 100 mounted on the carriage 200. This needle selection device 100 has a plurality of actuator cams 71 to 78, and each actuator cam 71 to 78 is formed by shifting each needle selection butt 61 in the longitudinal direction of the selectors 51 to 58 between adjacent selectors. Corresponds to ~ 68. That is, when the carriage 200 moves on the needle bed in the state shown in FIG. 1, the actuator cams 71 to 78 press the corresponding needle selection bats 61 to 68 to place the needle selection bats 61 to 68 in the needle grooves. Sink into. Further, when any one of the actuator cams (for example, the actuator cam 75) swings from the state shown in FIG. 1, even if the carriage 200 moves on the needle bed, the swinging actuator cam 75 acts on the needle selection bat 65. The needle selection bat 65 is not submerged (see also FIG. 2B).

  The above-described needle selection device 100 will be described in more detail. The needle selection device 100 includes, as shown in FIG. 2, a frame body 2, eight swinging actuators 1 attached to the frame body 2, and each swinging motion. A plurality of actuator cams 7 that are engaged with the lever 30 of the actuator 1 and swing in the longitudinal direction of the selector 5, and a fixed plate 3 (not shown in FIG. 2A) that fixes the swing actuator 1. . The actuator cam 7 has a shape as shown in FIG. 2C, and has an action portion 701 acting on the needle selection bat 6, a shaft hole 703 for pivotally supporting the actuator cam 7, and a swinging actuator. And an engaging portion 702 with which one lever 30 is engaged. The actuator cam 7 is attached to the frame 2 by a support shaft 8 inserted through the shaft hole 703 and is configured to be swingable about the support shaft 8. Further, the engaging portion 702 of the actuator cam 7 is formed so as to be shifted toward the left or right shaft hole 703 depending on the position of the oscillating actuator 1 having the lever 30 to be engaged. With this configuration, when the lever 30 of the oscillating actuator 1 oscillates, the actuator cam 7 that engages the lever 30 oscillates with the support shaft 8 as the oscillating fulcrum. Note that the number of the oscillating actuators 1 provided in the frame 2 is not limited to eight, and the arrangement thereof is not limited to the state shown in the drawing. However, according to the arrangement state shown in the drawing, many oscillating actuators 1 can be arranged in a small installation space, and the needle selection device 100 can be made compact.

  Hereinafter, the details of the oscillating actuator provided in the needle selection device of the flat knitting machine will be described with reference to FIGS.

  3 is a perspective view of the oscillating actuator, FIG. 4 is a schematic diagram of the oscillating actuator, (A) is a partial perspective view seen from above, and (B) is a YY cross section of (A). An arrow view and (C) are ZZ cross-sectional arrow views of (B).

<Overall configuration of oscillating actuator>
The oscillating actuator 1 includes a cylindrical bobbin 10, an excitation coil 11 disposed on the bobbin 10, and a lever 30 having one end protruding from the bobbin 10 and the other end pivotally supported in the bobbin. Further, the oscillating actuator 1 includes a yoke 20 that surrounds the outside of the coil 11, a side yoke (magnetic member) 22 that is disposed between one end 20A of the yoke 20 and a permanent magnet 21, and the other end of the yoke. 20B, and a side yoke (magnetic member) 29 disposed with the spacer 28 interposed therebetween.

<Each component of oscillating actuator>
The bobbin 10 includes a base portion 10B, an excitation coil forming portion 10C, and a flange portion 10F. In the exciting coil forming part 10C of the bobbin 10, an exciting coil 11 is formed by winding a coated conductor around the exciting coil forming part 10C.

  As described above, the other end of the lever 30 is pivotally supported on the base portion 10B of the bobbin 10 via the swing shaft 1S, and the lever 30 is configured to be swingable about the swing shaft 1S. .

  A substantially U-shaped yoke 20 made of a ferromagnetic material is disposed on the outer periphery of the exciting coil 11. The base portion 10B described above is fixed to the U-shaped corner portion of the yoke 20, and one end side of the lever 30 is disposed between the one end portion 20A and the other end portion 20B of the yoke 20. ing. Further, the flange portion 10F of the bobbin 10 has a rectangular plate-shaped permanent magnet 21 that contacts the one end portion 20A of the yoke 20 and a substantially L-shaped side yoke 22 made of a ferromagnetic material that contacts the permanent magnet 21. Is arranged. In addition, the flange portion 10F includes a spacer 28 made of a non-magnetic rectangular plate that contacts the other end 20B of the yoke 20 and a substantially L-shaped side yoke 29 made of a ferromagnetic material that contacts the spacer 28. And are arranged. Furthermore, a holder cap made of a non-magnetic material (for example, made of polybutylene terephthalate resin) so as to cover the outer ends of the one end 20A and the other end 20B of the yoke 20, the permanent magnet 21, the side yokes 22 and 29, and the spacer 28. 10H is engaged with the flange portion 10F. One end of a lever 30 housed inside the bobbin 10 protrudes from an opening 1M formed by the side yoke 22, the side yoke 29, and the holder cap 10H.

  The lever 30 includes a lever main body 31 made of a ferromagnetic material and a lever cap 40 made of a non-magnetic material provided at the tip of the lever main body 31 (a cross-shaped portion near the opening 1M). The lever 30 is in contact with the side yoke 22 by the action of the permanent magnet 21 when the excitation coil 11 is not energized. When the excitation coil 11 is energized, the excitation coil 11 is attracted to the side yoke 29 and abuts (see the two-dot chain line in FIG. 4B). That is, the lever 30 swings between the side yoke 22 and the side yoke 29 depending on whether or not the excitation coil 11 is energized. The lever cap 40 may be formed, for example, by insert molding in which the lever main body 31 is disposed in a mold and a non-magnetic material (for example, polyamide resin) is poured, or a lever manufactured separately from the lever main body 31. The cap 40 may be attached to the lever main body 31.

  The lever cap 40 provided in the lever 30 substantially covers the gap between the opening 1M and the lever 30 (lever body 31) regardless of whether the lever 30 swings to the side yoke 22 side or the side yoke 29 side. A cover part 41 is provided. The cover 41 has an arc shape centered on the swing shaft 1S when the swing actuator 1 is viewed from the front (see FIG. 4B), and when the swing actuator 1 is viewed from the top. It is formed in a rectangular shape (see FIG. 4A). Due to the cover 41, during the knitting operation of the flat knitting machine, the metal members involved in knitting such as the knitting cam, the knitting needle, the needle bed, and the needle selection device, for example, the action of the actuator cam 7 shown in FIG. Even if metal powder is generated due to contact between the portion 701 and the needle selection bat 6 or the like, it is possible to prevent the generated metal powder from entering the oscillating actuator 1 through the opening 1M. As a result, the malfunction of the oscillating actuator 1 due to foreign matter mixing inside is suppressed, and the needle selection mistake of the needle selection device is also suppressed. In particular, if the cover portion 41 is formed in an arc shape centered on the swing shaft 1S, it is difficult to form a gap between the cover portion 41 and the side yokes 22 and 29 (particularly, FIG. 2B). reference). Furthermore, it is preferable to form the upper surfaces of the side yokes 22 and 29 in an arc shape along the shape of the lower surface of the cover portion 41 because it is difficult to form a gap between the cover portion 41 and the side yokes 22 and 29.

  Further, since the lever cap 40 is made of a non-metallic material, metal powder is hardly generated by the contact between the lever 30 and the engaging portion 702 of the actuator cam 7, and the lever cap 40 is not magnetized. It is difficult for the metal powder generated by the metal member involved in the contact to the lever 30. From these points as well, it is possible to suppress problems due to foreign matter mixed in the oscillating actuator 1.

  The embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention. For example, even if the shapes of the side yokes 22 and 29 are changed, it is only necessary that the cover 41 covers the opening 1M.

  The needle selection device for a flat knitting machine of the present invention can be suitably used as a constituent member of a flat knitting machine with a low possibility of a knitting error.

It is a schematic explanatory drawing which shows the needle selection operation | movement by the needle selection apparatus of a flat knitting machine. (A) is a top view of the needle selection device, (B) is a view taken along the line XX of (A), and (C) is a front view of the actuator cam. It is a perspective view of a rocking actuator. (A) is the partial perspective view which looked at the swing type actuator from the upper surface, (B) is the YY section arrow view of (A), (C) is the ZZ section arrow view of (B).

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Needle selector 200 Carriage 1 Oscillating actuator 1M Opening 1S Oscillating shaft 2 Frame body 3 Fixing plate 10 Bobbin 10B Base part 10C Excitation coil forming part 10F Flange part 10H Holder cap 11 Excitation coil 20 Yoke 20A One end part 20B Others End portion 21 Permanent magnet 22 Side yoke 28 Spacer 29 Side yoke 30 Lever 31 Lever body 40 Lever cap 41 Covering portion 5,51-58 Selector 6,61-68 Needle selection butt 7,71-78 Actuator cam 701 Acting portion 702 Engagement part 703 Shaft hole 8 Support shaft

Claims (2)

A cylindrical bobbin, an exciting coil disposed on the bobbin, one end projecting outward from the bobbin, the other end pivotally supported in the bobbin, and one end of the lever sandwiching the lever A needle selection device of a flat knitting machine, wherein the lever is oscillated between both magnetic members by an electromagnetic force accompanying excitation of the excitation coil, and the knitting needle is selected by the oscillation of the lever. And
The lever is provided with a cover that covers a gap formed between the lever and both magnetic members from the outside of the gap.   2. The needle selection device for a flat knitting machine according to claim 1, wherein the cover portion is formed in an arc shape substantially along a swing locus of the lever.

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