JP2014025174A - Tension detector for knitting yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension detector for a knitting yarn capable of stopping a flat-knitting machine when it becomes impossible to newly supply a knitting yarn, which is prevented from yarn breakage, to a knitting needle.SOLUTION: There is provided a tension detector 2 for detecting a variation in tensile strength of a knitting yarn 3 on a supply path 30 of a flat-knitting machine for supplying a knitting yarn 3 from a yarn package to a knitting needle. The tension detector 2 is provided with a second yarn guide 32 at the tip of an extended plate 23 for extending the supply path 30 toward the outside of the path, for swinging the knitting yarn 3 between a guide position for guiding the knitting yarn 3 on the supply path 30 and a detaching position for detaching the knitting yarn 3 so that it cannot be guided. A microswitch 43 is turned ON, when a high strength knitting yarn is applied to prevent a yarn breakage on the supply path 30 and the second yarn guide 32 is swung from the guide position to the detaching position due to the tension of the knitting yarn 3, to detect a rapid variation in tensile strength of the knitting yarn 3 and output a signal for stopping a driving mechanism of the flat-knitting machine. The knitting yarn detached from the tip of the extended plate is left on the supply path 30 as a knitting yarn newly supplied to the knitting needle.

Description

  The present invention relates to a knitting method for detecting fluctuations in the tension of a knitting yarn on a supply path of a knitting machine that is supported by a top spring that extends upward from a yarn stand and then forwards and then is supplied toward a knitting needle. The present invention relates to a yarn tension detecting device.

  2. Description of the Related Art Conventionally, a tension detecting device for a knitting yarn that detects fluctuations in the tension of the knitting yarn on a supply path of a knitting yarn supplied from a yarn stand to a knitting needle is known (for example, see Patent Document 1). The tension detecting device includes a yarn guide provided at the front end of the leaf spring and disposed on the front side of the final yarn guide that guides the knitting yarn to the knitting needle on the supply path, and a leaf spring that is bent by the tension of the knitting yarn. A pair of magnets having polarities that repel each other in the bending direction and a magnetoresistive transducer that detects a change in the direction of the magnetic flux of the pair of magnets are provided. Then, the fluctuation of the tension before the knitting yarn breaks is detected based on the change in the direction of the magnetic flux of the pair of magnets by the magnetoresistive transducer, thereby stopping the knitting machine before the knitting yarn breaks. ing.

JP-A-7-150452

  By the way, a knitting yarn (for example, an aramid fiber yarn or the like) that prevents yarn breakage on the supply path may be used. Regarding yarn breakage, since the knitting yarn has high strength and does not break, it is necessary to detect fluctuations in the tension of the knitting yarn with the tension detector and stop the flat knitting machine before the knitting yarn breaks. Absent.

  However, if a knitting yarn that does not break the yarn is used, the knitting machine will not stop even if a new knitting yarn cannot be supplied to the knitting needle because the knitting yarn is caught on the supply path. May cause troubles such as damage.

  An object of the present invention is to provide a tension detecting device for a knitting yarn that can stop a knitting machine when a knitting yarn that does not break on the supply path cannot be newly supplied to a knitting needle.

  In order to achieve the object, in the present invention, the knitting yarn is provided on a supply path of a knitting machine in which the knitting yarn is supplied toward the knitting needle after being supported by a top spring that extends upward from the yarn stand and then extends forward. As a knitting yarn, a knitting yarn for preventing yarn breakage on the supply path is applied as a knitting yarn. Further, a yarn guide that moves by tension of the knitting yarn while guiding the knitting yarn on the supply path, and a biasing means that biases the yarn guide in a moving direction against the tension of the knitting yarn, Detecting means for detecting a rapid change in tension of the knitting yarn on the supply path by movement of the yarn guide against the urging force of the urging means. The detecting means outputs an electrical signal for stopping the knitting machine when the yarn guide moves against the urging force of the urging means.

  In addition, a yarn guide that swings and moves between two positions by the tension of the knitting yarn while guiding the knitting yarn on the supply path is provided, and the yarn guide is a tension of the knitting yarn on the supply path. When the pressure suddenly increases, it swings against the urging force of the urging means from one of the two positions to the other position. The detecting means includes an electrical contact that switches to an energized state or a non-energized state when the yarn guide swings from one position to the other position, and the electrical contact is switched to an energized state or a non-energized state. You may detect the fluctuation | variation of the rapid tension | tensile_strength of the said knitting yarn when changing.

  Further, the yarn guide is provided at an extended end that expands the supply path to the outside of the path, and guides the knitting yarn when the yarn guide swings to the other position that detects a sudden change in the tension of the knitting yarn. It is preferable to make the knitting yarn to be disengaged impossible and to be surplus on the supply path as new knitting yarn to be supplied to the knitting needle.

  On the other hand, a yarn guide that slides and moves between two positions by tension of the knitting yarn while guiding the knitting yarn on the supply path is provided. When the tension suddenly increases, it slides against the urging force of the urging means from one of the two positions to the other position. The detection means includes an electrical contact that switches to an energized state or a non-energized state when the yarn guide slides from one position to the other position, and the electrical contact switches to an energized state or a non-energized state. When this occurs, a sudden change in tension of the knitting yarn may be detected.

  By outputting an electrical signal that stops the knitting machine when a sudden fluctuation in the tension of the knitting yarn is detected by movement of the yarn guide against the urging force of the urging means, such as when a knitting yarn that does not break the yarn is caught Troubles such as breakage of the hook of the knitting needle can be surely prevented.

  When the tension of the knitting yarn suddenly increases, the thread guide is slid from one position to the other position to switch the electrical contact between the energized state and the de-energized state. By detecting the fluctuation, the knitting machine can be stopped without applying excessive tension to the knitting yarn.

  In addition, when the yarn guide swings to the release position, the knitting yarn is released from the extended end outside the supply path and made redundant on the supply path. The surplus knitting yarn on the supply path is supplied as a new knitting yarn to the knitting needles until it stops. Thereby, even if the knitting machine is stopped, the stitches being knitted are not clogged and the stitches before and after the stop of the knitting machine are not changed, and product defects can be prevented.

  In contrast, when the tension of the knitting yarn suddenly increases on the supply path, the yarn contact is slid from one position to the other position to switch the electrical contact between the energized state and the de-energized state. By detecting a sudden change in the tension of the yarn, the knitting machine can be stopped without applying excessive tension to the knitting yarn.

1 is a side view showing a schematic configuration of a flat knitting machine using a knitting yarn tension detection device according to a first embodiment of the present invention. It is explanatory drawing which simplifies and shows the supply path | route of the knitting yarn of FIG. It is a side view which shows the structure of the tension | tensile_strength detection apparatus of FIG. It is a side view which shows schematic structure of the flat knitting machine using the tension | tensile_strength detection apparatus of the knitting yarn which concerns on the 2nd Embodiment of this invention. FIG. 5 is an explanatory diagram illustrating a knitting yarn supply path of FIG. 4 in a simplified manner. It is a top view which shows the structure of the tension | tensile_strength detection apparatus of FIG.

  Next, preferred embodiments of the tension detecting device for knitting yarn of the present invention will be described in detail with reference to the drawings. In the embodiment described below, a change in the tension of a knitting yarn is detected on a supply path of a flat knitting machine as a knitting machine.

  FIG. 1 is a side view showing a schematic configuration of a flat knitting machine using a knitting yarn tension detecting device according to a first embodiment of the present invention. The flat knitting machine 1 includes front and back needle beds 11 and 12. The mouth 13 is formed between the needle beds 11 and 12. Carriages 14 and 15 are provided above the front and rear needle beds 11 and 12, respectively. The carriages 14 and 15 drive at least one of the plurality of yarn feeders 16 and 16 so as to reciprocate in the left-right direction (the frontward and rearward direction in FIG. 1). It is driven by. Each carriage 14, 15 is equipped with a cam (not shown) for driving a knitting needle (not shown).

  The tension detecting device 2 is supported by a top spring 26 that extends upward from a yarn package 22 of a yarn stand 21 attached to a lower portion of a strut 20 that extends upward, and then extends forward, and then the yarn feeder 16 of the flat knitting machine 1. Is provided on a supply path 30 for supplying the knitting yarn 3 to the knitting needle. As the knitting yarn 3, a knitting yarn (for example, a high-strength yarn such as an aramid fiber yarn) for preventing yarn breakage on the supply path 30 is applied.

  FIG. 2 is an explanatory diagram showing the knitting yarn supply path in a simplified manner. On the supply path 30, first to fifth yarn guides 31 to 35 are provided in the order of the knitting yarn 3 path. The first yarn guide 31 is attached to a substantially intermediate portion in the vertical direction of the support column 20 and includes a brake 37 between a pair of upper and lower annular guide portions 36 and 36. The brake 37 adjusts the resistance (braking force) acting on the knitting yarn 3 sandwiched between the two brake disks 371 and 371 by a spring (not shown).

  The third yarn guide 33 includes a brake 37 that is attached to the upper end of the support column 20 and brakes the knitting yarn 3 guided by the guide portion 36 attached to the back panel 24. The fourth yarn guide 34 is attached in the vicinity of the front end portion of the support frame 25 extending substantially horizontally forward from the upper end of the support column 20, and guides the knitting yarn 3 guided from the third yarn guide 33 through the guide portion 36. A brake 37 for braking is provided. Furthermore, a top spring 26 is attached to the base portion of the support frame 25 and extends substantially parallel above the support frame 25. The top spring 26 includes a guide portion 36 that guides the knitting yarn 3 from the fourth yarn guide 34 at the tip thereof. The fifth thread guide 35 includes a substantially U-shaped guide portion 39 attached to the tip of the support frame 25.

  FIG. 3 is a side view showing the configuration of the tension detection device 2. The tension detection device 2 detects a variation in the tension of the knitting yarn 3 on the supply path 30 and includes a second yarn guide 32. ing. The second yarn guide 32 guides the knitting yarn 3 in the portion of the supply path 30 from the first yarn guide 31 to the third yarn guide 33. The second thread guide 32 is supported so as to be swingable with respect to the base body 40 via a shaft 41. The second yarn guide 32 has a substantially U-shaped guide hole 321, and a guide position for guiding the knitting yarn 3 (a position indicated by a solid line in FIG. 3) and a detachment that allows the knitting yarn 3 to be unguided. It swings to a position (position indicated by a two-dot chain line in FIG. 3).

  The tension detection device 2 includes a magnet 42 as an urging means provided on the base body 40. The magnet 42 urges the second yarn guide 32 toward the guide position in the moving direction against the tension of the knitting yarn 3. Further, the tension detecting device 2 detects a rapid change in the tension of the knitting yarn 3 such that the knitting yarn 3 is caught on the supply path 30 and the new knitting yarn 3 cannot be supplied to the knitting needle. Detection means 38 for detecting by tension is provided. The detection means 38 includes a micro switch 43 as an electrical contact that switches to an ON state (energized state) when the second thread guide 32 swings from the guide position to the release position. The second thread guide 32 is attracted to the magnet 42 and held at the guide position, and in this state, the microswitch 43 is switched to the OFF state (non-energized state). A micro switch that switches to a non-energized state when the second thread guide swings from the guide position to the disengagement position, or a position detection switch that detects the position of the second thread guide, or a simple ON / OFF An electrical contact such as an OFF switch may be used.

  Then, the micro switch 43 causes the second yarn guide 32 to contact the magnet 42 by the tension of the knitting yarn 3 such that the knitting yarn 3 is caught on the supply path 30 and the new knitting yarn 3 cannot be supplied to the knitting needle. When the suction is released and swings to the disengagement position, it is switched to the ON state, thereby detecting a rapid change in tension of the knitting yarn 3. At this time, the ON signal from the micro switch 43 is transmitted to a control unit (not shown) that controls the drive mechanism of the flat knitting machine 1 to stop the drive mechanism of the flat knitting machine 1. As a result, the driving mechanism of the flat knitting machine 1 can be stopped without applying excessive tension to the knitting yarn 3, and troubles such as breakage of the hook of the knitting needle can be reliably prevented.

  Further, the second thread guide 32 is provided at an extended end in which the supply path 30 is extended obliquely upward and rearward (outward) of the supply path 30 by the extending plate 23, and when the second thread guide 32 swings to the disengagement position. The detaching knitting yarn 3 is surplus on the supply path 30 as a new knitting yarn to be supplied to the knitting needle. As a result, surplus knitting yarn 3 on the supply path 30 is supplied to the knitting needle as new knitting yarn 3 until the drive mechanism of the flat knitting machine 1 is completely stopped when the tension of the knitting yarn 3 changes suddenly. Is done. Thereby, even when the driving mechanism of the flat knitting machine 1 is stopped, the stitches being knitted are not clogged, and the stitches before and after the stop of the driving mechanism of the flat knitting machine 1 are not changed, and product defects can be prevented. .

  In the present embodiment, the substantially U-shaped second yarn guide 32 is used. However, the second yarn guide uses the annular second yarn guide, and the second yarn guide guides the knitting yarn on the supply path. When the yarn guide swings between two positions and the yarn guide swings from one of the two positions to the other by the tension of the knitting yarn on the supply path, the micro switch turns from OFF to ON By switching to the state, a sudden fluctuation in the tension of the knitting yarn may be detected, and the driving mechanism of the flat knitting machine may be stopped without applying excessive tension to the knitting yarn.

Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 4 is a side view showing a schematic configuration of a flat knitting machine using a knitting yarn tension detecting device according to a second embodiment of the present invention, FIG. 5 is an explanatory diagram showing a knitting yarn supply path in a simplified manner, FIG. 6 is a plan view showing the configuration of the tension detecting device. Since the other configuration excluding the knitting yarn supply path is the same as that of the first embodiment, only the configuration of the supply path will be described.

  That is, as shown in FIGS. 4 and 5, the first to third yarn guides 51 to 53 are provided on the supply path 50 in the order of the path of the knitting yarn 3. The first yarn guide 51 is attached to the upper end of the support column 20 and includes a brake 37 that brakes the knitting yarn 3 guided by the guide portion 36 attached to the back panel 24. The second yarn guide 52 is attached in the vicinity of the front end portion of the support frame 25 extending substantially horizontally forward from the upper end of the support column 20, and the knitting yarn 3 guided from the first yarn guide 31 through the guide portion 36. A brake 37 for braking is provided. Further, a top spring 26 extending substantially in parallel above the support frame 25 is attached to the base of the support frame 25, and a guide portion for guiding the knitting yarn 3 from the second yarn guide 52 to the tip of the top spring 26. 36. The third yarn guide 53 includes a guide portion 36 attached to the tip of the support frame 25, and guides the knitting yarn 3 in the portion of the supply path 50 from the guide portion 36 at the tip of the top spring 26 to the yarn feeder 16. It protrudes forward so that it always makes sliding contact with the rear portion.

  As shown also in FIG. 6, the tension detection device 6 detects fluctuations in the tension of the knitting yarn 3 on the supply path 50 and includes a third yarn guide 53. Further, the tension detection device 6 includes a base body 60 having a substantially U-shaped support portion 66 that supports the guide portion 36 of the third thread guide 53 to slide in the front-rear direction (vertical direction in FIG. 6). . The substrate 60 is made of a conductive metal. Further, the tension detecting device 6 detects a rapid change in the tension of the knitting yarn 3 so that the new knitting yarn 3 cannot be supplied to the knitting needle due to the knitting yarn 3 being caught on the supply path 50 or the like. Detection means 65 for detecting by tension is provided. The detection means 65 includes one of the positive electrode portion 61 and the negative electrode portion 61 connected to the base body 60, and the positive electrode portion and the negative electrode portion connected to the guide portion 36 of the third yarn guide 53. An electrical contact comprising the other electrode portion 62 is provided. An electrical contact connected to the base and the guide portion of the third yarn guide so that the energized state is switched to the non-energized state when the guide portion of the third yarn guide slides from one position to the other position. It may be.

  The guide portion 36 of the third yarn guide 53 is positioned at two positions on the front and rear sides by the tension of the knitting yarn 3 such that the knitting yarn 3 is caught on the supply path 30 and the new knitting yarn 3 cannot be supplied to the knitting needle. It slides backward from one of the positions (the position indicated by the solid line in FIG. 6) to the other position (the two-dot chain line position in FIG. 6). The other electrode portion 62 abuts on the base body 60 by sliding the guide portion 36 of the third yarn guide 53 to the other position, and energizes the one electrode portion 61 through the base body 60, thereby knitting. A sudden change in tension of the yarn 3 is detected. At this time, a signal is transmitted to a control unit (not shown) that controls the drive mechanism of the flat knitting machine 1 by energization of both electrode parts 61 and 62, and the drive mechanism of the flat knitting machine 1 is stopped. As a result, the driving mechanism of the flat knitting machine 1 can be stopped without applying excessive tension to the knitting yarn 3, and troubles such as breakage of the hook of the knitting needle can be reliably prevented.

  The base 60 is provided with a leaf spring 64 as an urging means for urging the guide portion 36 of the third yarn guide 53 toward one position in the moving direction against the tension of the knitting yarn 3. When the tension of the knitting yarn 3 suddenly increases on the path 50, the guide portion 36 of the third yarn guide 53 slides to the other position against the urging force of the leaf spring 64. Thereby, when the tension of the knitting yarn 3 is slightly increased, the guide portion 36 of the third yarn guide 53 does not slide to the other position, and an erroneous detection of a rapid tension variation of the knitting yarn 3 can be avoided. . Needless to say, the guide portion of the third thread guide may be urged to one position not only by the leaf spring 64 but also by an elastic body or a coil spring.

DESCRIPTION OF SYMBOLS 1 Flat knitting machine 2 Tension | tensile_strength detection apparatus 21 Tension stand 26 Top spring 3 Knitting thread 30 Supply path 32 Second thread guide 38 Detection means 42 Magnet 43 Micro switch 50 Supply path 53 Third thread guide 6 Tension detection apparatus 61 One electrode Part 62 other electrode part 64 leaf spring 65 detection means

Claims (4)

The tension of the knitting yarn that detects fluctuations in the tension of the knitting yarn on the supply path of the knitting machine that is supported by the top spring that extends upward from the yarn stand and then is supplied to the knitting needle. In the detection device,
As the knitting yarn, knitting yarn for preventing yarn breakage on the supply path is applied,
A yarn guide that moves by tension of the knitting yarn while guiding the knitting yarn on the supply path, urging means that urges the yarn guide in a moving direction against the tension of the knitting yarn, and the supply path Detecting means for detecting a sudden change in tension of the knitting yarn by moving the yarn guide against the urging force of the urging means;
The apparatus for detecting tension in a knitting yarn, wherein the detecting means outputs an electric signal for stopping the knitting machine when the yarn guide moves against the urging force of the urging means. The yarn guide includes a yarn guide that swings and moves between two positions according to the tension of the knitting yarn while guiding the knitting yarn on the supply route, and the yarn guide has a rapid tension of the knitting yarn on the supply route. Swinging from one position of the two positions to the other position against the biasing force of the biasing means,
The detection means includes an electrical contact that switches to an energized state or a non-energized state when the yarn guide swings from one position to the other position, and the electrical contact is switched to an energized state or a non-energized state. 2. The knitting yarn tension detecting device according to claim 1, which detects a sudden change in tension of the knitting yarn.   The yarn guide is provided at an extended end that expands the supply path to the outside of the path, and makes the knitting yarn unguideable when it swings to the other position that detects a sudden change in tension of the knitting yarn. The tension detecting device for a knitting yarn according to claim 2, wherein the knitting yarn is separated and surplused on the supply path as a new knitting yarn to be supplied to the knitting needle. The yarn guide includes a yarn guide that slides and moves between two positions according to the tension of the knitting yarn while guiding the knitting yarn on the supply route, and the yarn guide has a rapid tension of the knitting yarn on the supply route. When it becomes large, it slides against the biasing force of the biasing means from one of the two positions to the other position,
The detection means includes an electrical contact that switches to an energized state or a non-energized state when the yarn guide slides from one position to the other position, and the electrical contact is switched to an energized state or a non-energized state. The apparatus for detecting tension in a knitting yarn according to claim 1, wherein a rapid fluctuation in tension of the knitting yarn is detected.

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