A control switch and yarn guide device

Abstract

The present application belongs to the technical field of textile machinery, and provides a control switch and a yarn guide device. The control switch comprises a contact switch for controlling the power-on and power-off of a driving device; a switch rotating shaft acting on the contact switch, the switch rotating shaft being rotated to form a first rotating position for the power-on of the driving device and a second rotating position for the power-off of the driving device; a pre-tightening member coupled with the switch rotating shaft, and a driving arm axially connected to the switch rotating shaft; the pre-tightening member applies a torsional force to the driving arm to drive the switch rotating shaft to rotate from the first rotating position to the second rotating position, and keeps the switch rotating shaft at the second rotating position. Through the present application, the problem of unclear state indication of the existing yarn guide device is solved, and the power supply of the driving device can be cut off in time when an abnormality occurs, preventing the driving device from overloading.

Description

Technical Field

[0001] This invention relates to the field of textile machinery technology, and in particular to a control switch and yarn guiding device. Background Technology

[0002] The yarn guiding device is a core component in textile machinery such as false-twist textured machines, winding machines, and drawing frames, used to guide and transport yarn. It typically includes a conveyor roller, a guide roller, and a drive unit that drives the conveyor roller. The yarn is transported by winding around the conveyor and guide rollers in multiples. Yarn breakage, tension loss, or other reasons can easily cause yarn entanglement (such as yarn piling) on ​​the surface of the conveyor roller or be caught in the drive unit (such as a motor), leading to production interruptions. Therefore, the yarn transport status of the yarn guiding device must be monitored, and the power supply to the drive unit should be directly cut off in case of abnormalities.

[0003] One existing technology implements this by using a mechanical winding detector (e.g., 200780017925.5), which employs a rotatable handle as the winding detector, configured with a small gap between the detector and the roller housing. In the event of an abnormality such as winding, the yarn drives the winding detector to rotate based on friction, thereby mechanically cutting off the power supply to the drive device. The aforementioned prior art has the following drawbacks: First, since power off is achieved by the yarn contacting the winding detector to rotate it, the prior art cannot accurately control the rotation angle of the winding detector, and the power on / off status is only indicated by a small change in the knob's angle, resulting in unclear status indication. In workshops where false-twist texturing machines typically have hundreds of stations and densely packed equipment, operators find it difficult to quickly and accurately identify whether the power to a yarn guide device on a particular yarn transport path has been turned off visually. Second, the aforementioned prior art cannot distinguish between normal power off due to actual winding and abnormal power off due to equipment vibration or accidental knob touch. Finally, the linkage mechanisms in the aforementioned prior art are mostly made of plastic parts, which can lead to aging, insufficient rigidity, and rotational jamming after long-term operation. This results in decreased detection sensitivity and inconsistent rotation angles when the power is turned off. Therefore, it is necessary to improve the switches and yarn guiding devices containing the switches in the existing technology to solve the above problems.

[0004] It should be noted that the above description of the background technology is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background technology section of this application. Summary of the Invention

[0005] The purpose of this invention is to disclose a control switch and a yarn guiding device including the control switch, so that the control switch can promptly shut off the power supply to the drive device of the conveying device when the yarn abnormality occurs, so as to avoid overload of the drive device, and solve the problem of unclear indication of the current working status of the conveying device in the prior art.

[0006] To achieve one of the above objectives, embodiments of the present invention provide a control switch for a yarn guiding device in textile machinery, the yarn guiding device comprising: a conveying roller and a driving device for driving the conveying roller, the control switch comprising:

[0007] A contact switch is used to control the power supply to and from the drive device.

[0008] A switch shaft acts on the contact switch, and the switch shaft rotates to form a first rotational position where the power to the drive device is turned on and a second rotational position where the power to the drive device is turned off.

[0009] The preload is coupled to the switch shaft;

[0010] The drive arm is axially connected to the switch shaft;

[0011] The preload applies a torsional force to the drive arm, driving the switch shaft to rotate from the first rotational position to the second rotational position, and holds the switch shaft in the second rotational position.

[0012] As a further improvement of the present invention, the control switch further includes: a housing and a limiting assembly, the limiting assembly including a first elastic element and a limiting member, the two free ends of the first elastic element respectively abutting against the limiting member and the housing, and the switch shaft forming a limiting groove that movably restricts the limiting member;

[0013] The switch shaft is held in the first rotational position by the combined action of the limiting member and the limiting groove.

[0014] As a further improvement of the present invention, the switch shaft has a first cam that abuts against the limiting member during rotation, and the housing forms a limiting and retaining cavity for accommodating the first elastic element;

[0015] The outer edge contour of the first cam includes: a limiting surface forming the limiting groove, and a rotating surface recessed relative to the limiting surface onto the switch shaft;

[0016] When the switch shaft switches between the first rotation position and the second rotation position, the limiting member abuts against the outer edge contour of the first cam and slides between the limiting surface and the rotation surface.

[0017] As a further improvement of the present invention, the rotating surface includes a sliding surface and a guide surface near the limiting surface, wherein the sliding surface and the limiting surface form an abrupt transition through the guide surface, or...

[0018] The rotating surface includes a sliding surface and a transition surface near the limiting surface, and the limiting surface and the sliding surface form a continuous natural transition through the transition surface.

[0019] As a further improvement of the present invention, the first cam forms a radial protrusion; the end plate forms a relief cavity communicating with the limiting and retaining cavity, and the thickness of the relief cavity along the direction of the first axis is greater than the thickness of the radial protrusion along the direction of the first axis.

[0020] As a further improvement of the present invention, the housing includes a first housing, a third housing and an end plate that are movably fastened together, the switch shaft passes through the end plate, the end plate is provided with a protrusion forming the limiting and retaining cavity, and the protrusion forms a first stop and a second stop on both sides of the limiting and retaining cavity respectively.

[0021] The side of the limiting surface away from the rotating surface forms a first abutting surface that movably abuts against the first stop portion, and the side of the rotating surface away from the limiting surface forms a second abutting surface that movably abuts against the second stop portion.

[0022] When the switch shaft is in the first rotational position, the first abutting surface abuts against the first stop portion; when the switch shaft is in the second rotational position, the second abutting surface abuts against the second stop portion.

[0023] As a further improvement of the present invention, the preload is configured as a torsion spring; the housing forms a support portion that is fixed relative to one free end of the torsion spring, and the other free end of the torsion spring is fixed relative to the drive arm; the torsion spring applies a torsional force to the drive arm to drive the switch shaft to rotate from the first rotation position to the second rotation position, and keeps the switch shaft in the second rotation position.

[0024] As a further improvement of the present invention, the control switch further includes: a knob, the knob being axially connected to the free end of the switch shaft away from the drive arm and protruding from the housing, the knob driving the switch shaft to switch between the first rotation position and the second rotation position.

[0025] As a further improvement of the present invention, the control switch includes: a drive control circuit and an actuation device controlled by the drive control circuit;

[0026] The drive control circuit includes: a push-pull drive unit, an energy storage unit, a switching unit, a positive power supply terminal, a negative power supply terminal, and an enable signal input terminal;

[0027] The push-pull drive unit is connected between the positive terminal of the power supply and the energy storage unit, and the push-pull drive unit is connected between the enable signal input terminal and the switch unit. The switch unit is electrically connected to the energy storage unit and the actuation device.

[0028] After receiving the enable signal input from the enable signal input terminal, the switching unit is turned on so that the energy storage unit outputs the target voltage to the actuation device, and the actuation device applies a pushing force to the switch shaft through the drive arm to rotate it from the first rotation position to the second rotation position.

[0029] As a further improvement of the present invention

[0030] The push-pull drive unit includes: a first transistor Q1 and a second transistor Q2;

[0031] The energy storage unit includes: an energy storage circuit, the energy storage circuit including at least one capacitor;

[0032] The switching unit includes: a field-effect transistor Q3 and a load output interface;

[0033] The positive terminal of the power supply is electrically connected to the collector of the first transistor Q1, the base of the first transistor Q1 is electrically connected to the collector of the second transistor Q2, the energy storage circuit is connected in parallel between the emitters of the first transistor Q1 and the emitters of the second transistor Q2, the positive terminal of the capacitor is electrically connected to the first output terminal of the load output interface, the negative terminal of the capacitor is grounded, the enable signal input terminal is electrically connected to the gate of the field-effect transistor Q3, the base of the second transistor Q2 is connected between the enable signal input terminal and the gate of the field-effect transistor Q3, the drain of the field-effect transistor Q3 is electrically connected to the second output terminal of the load output interface, and the source of the field-effect transistor Q3 is electrically connected to the negative terminal of the power supply and is grounded together.

[0034] As a further improvement of the present invention, the control switch further includes: a signal driving circuit and a magnetic element disposed on the switch shaft and rotating synchronously with the switch shaft, as well as a voltage conversion circuit;

[0035] The signal driving circuit includes: a differential signal driving unit, an alarm device driving unit, and an alarm device;

[0036] The differential signal driving unit includes: logic gate chip U2 and Hall element U3; the alarm device driving unit includes: fourth transistor Q4; the alarm device includes: alarm body, alarm body positive terminal and alarm body negative terminal respectively electrically connected to the alarm body.

[0037] The first data input terminal of the logic gate chip U2 is electrically connected to the enable signal input terminal; the second data input terminal of the logic gate chip U2 is electrically connected to the OUT terminal of the Hall element U3; the VDD terminal of the Hall element U3 is electrically connected to the first power supply terminal; the VCC terminal of the logic gate chip U2 is electrically connected to the second power supply terminal; the data output terminal of the logic gate chip U2 is electrically connected to the base of the fourth transistor Q4; the collector of the fourth transistor Q4 is electrically connected to the third power supply terminal; the emitter of the fourth transistor Q4 is electrically connected to the positive terminal of the display body of the alarm device; and the negative terminal of the display body of the alarm device is grounded.

[0038] The Hall element U3 detects the switch shaft being in the first or second rotational position by sensing the change in the magnetic field of the magnetic element and outputs a position status signal. The logic gate chip U2 compares the enable signal and the position status signal and outputs a control signal based on the comparison result to control the alarm device to be turned on or off.

[0039] The voltage conversion circuit includes: a linear regulator U1, the IN terminal of which is electrically connected to the fourth power supply terminal, the OUT terminal of which is electrically connected to the VCC terminal of the logic gate chip U2 and the VDD terminal of the Hall element U3, and the OUT terminal of which outputs low-voltage DC power.

[0040] As a further improvement of the present invention, the actuation device includes: a fixed base, an electromagnetic drive unit disposed on the fixed base, and a reset member;

[0041] The electromagnetic drive unit includes: an actuator rod and a coil surrounding the outer periphery of the actuator rod, the coil being electrically connected to the load output interface, and the reset member abutting between the fixed base and the actuator rod;

[0042] When the drive control circuit energizes the coil through the load output interface, the actuator rod extends to perform a pushing action on the drive arm, thereby applying a pushing force to the switch shaft to rotate from the first rotation position to the second rotation position.

[0043] When the drive control circuit stops energizing the coil through the load output interface, the actuator is forced by the reset member to retract in the opposite direction to the drive arm.

[0044] Based on the same inventive concept, embodiments of the present invention provide a yarn guiding device, comprising: a conveying roller, a guiding roller, a driving device for driving the conveying roller, and a control switch as described in any of the foregoing inventions, wherein the conveying roller and the guiding roller partially wind the guiding yarn.

[0045] Compared with the prior art, the beneficial effects of the various embodiments of the present invention include some or all of the following:

[0046] When a yarn abnormality occurs, the control switch triggers the drive arm in the control switch to rotate the switch shaft based on the received enable signal. The pretensioner applies a torsional force to the drive arm, causing the switch shaft to rotate from the first rotation position to the second rotation position, and keeps the switch shaft in the second rotation position to cut off the power supply to the drive device in a timely manner. At the same time, the torsional force applied by the pretensioner causes the switch shaft to rotate at a large angle between the first and second rotation positions. This clearly distinguishes whether the switch shaft is in the first or second rotation position, and thus can distinguish whether the power supply to the drive device is on or off, thereby solving the problem of unclear status indication of the yarn guiding device in the prior art. Attached Figure Description

[0047] Figure 1 A perspective view of a control switch provided in an embodiment of the present invention is shown, omitting the knob.

[0048] Figure 2 A perspective view of the knob, second housing, and third housing is shown to omit the control switch.

[0049] Figure 3 A top view of the knob, second housing, and third housing is shown to omit the control switch.

[0050] Figure 4 The control switch is omitted from the front view showing the knob, the second housing, and the third housing;

[0051] Figure 5 A perspective view of the knob, second housing, and third housing is shown from another angle to omit the control switch.

[0052] Figure 6 For along Figure 1 The sectional view shown in the middle AA direction;

[0053] Figure 7 This is a partial sectional view perpendicular to the AA direction and coinciding with the first axis;

[0054] Figure 8 A perspective view of the switch shaft, limiting component, first elastic element, drive arm, and pretensioner.

[0055] Figure 9 A front view of the switch shaft and drive arm along a first axis in one embodiment;

[0056] Figure 10 A front view of the switch shaft and drive arm along a first axis in another embodiment;

[0057] Figure 11 This is a rear view of the switch shaft and drive arm along the first axis;

[0058] Figure 12 A front view of the switch shaft and knob in the first rotational position along the first axis;

[0059] Figure 13 A front view of the switch shaft and knob in the second rotational position along the first axis;

[0060] Figure 14 This is a schematic diagram of a yarn guiding device provided in an embodiment of the present invention;

[0061] Figure 15 A circuit diagram of a drive control circuit provided in an embodiment of the present invention;

[0062] Figure 16 A circuit diagram of a signal driving circuit provided in an embodiment of the present invention;

[0063] Figure 17 This is a circuit diagram of a voltage conversion circuit provided in an embodiment of the present invention. Detailed Implementation

[0064] The present application will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present application. All equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are within the scope of protection of the present application.

[0065] In brief, this disclosure provides a control switch 10 for controlling the start-up (or described as "running") and stop (or described as "shutting down") of a yarn guiding device 100 in textile machinery (not shown), and several specific embodiments of the yarn guiding device 100 including the control switch 10. Textile machinery includes, but is not limited to, false-twist texturing machines, fiber winding equipment, drawing frames, carding machines, and other equipment that requires winding and conveying yarn. The yarn guiding device 100 includes: a conveying roller 501 and a drive device 503 (e.g., a motor) for driving the conveying roller 501. The control switch 10 is used to directly control the on and off of the power supply to the drive device 503. When the power supply to the drive device 503 is on, the yarn guiding device 100 conveys yarn in a winding manner; when the power supply to the drive device 503 is off, the yarn guiding device 100 stops conveying yarn.

[0066] like Figures 1 to 5 An example of the control switch 10 shown.

[0067] The control switch 10 includes a contact switch 11, a switch shaft 12, a pretensioner 13, and a drive arm 14. These components are housed as a whole in a housing 15 with a split structure. The contact switch 11 controls the power supply to the drive device 503. The switch shaft 12 rotates on the contact switch 11, forming a first rotational position 601 where the drive device 503 is powered on and a second rotational position 602 where the drive device 503 is powered off. The pretensioner 13 is coupled to the switch shaft 12 along the direction of the first axis 60. The drive arm 14 is axially connected to the switch shaft 12 and moves with it. When a yarn abnormality occurs, the drive arm 14 rotates under stress, and the pretensioner 13 applies a torsional force to the drive arm 14, driving the switch shaft 12 to rotate from the first rotational position 601 to the second rotational position 602. In particular, the torsional force is less than the retaining force formed between the limiting member 162 and the limiting groove 121, so as to ensure that the switch shaft 12 can be held in the first rotation position 601 under the combined action of the limiting member 162 and the limiting groove 121. After the switch shaft 12 rotates to the second rotation position 602, the switch shaft 12 is held in the second rotation position 602 to avoid overload and burnout of the drive device 503. When the abnormal yarn condition disappears (for example, the abnormally tangled or piled yarn in the yarn guide device 100 is cleaned up, or the yarn is rewound, etc.), the knob 17 can be manually rotated to rotate from the second rotation position 602 to the first rotation position 601 and be held, so as to reconnect the power supply of the drive device 503.

[0068] Combination Figure 8 and Figure 14As shown, the contact switch 11 has at least one switchable intermittent contact portion 111 for controlling the conduction and cutoff of current in the power supply line 504 of the drive device 503. For each intermittent contact portion 111, one end forms a first terminal 1111, and the other end forms two second terminals 1112 (i.e., second terminals 1112a and 1112b), and the intermittent contact portion 111 forms contactable or separable contacts 1114 and 1115. The second terminals 1112a and 1112b are integral. When contacts 1114 and 1115 are separated, the first terminal 1111 and the two second terminals 1112 are turned off, and the drive device 503 stops and does not transmit yarn; when contacts 1114 and 1115 are in contact, the first terminal 1111 and the two second terminals 1112 are connected, and the drive device 503 runs and transmits yarn. Optionally, the drive unit 503 can be a three-phase AC motor. Correspondingly, the intermittent contact portion 111 of the contact switch 11 is configured with three terminals to connect the three-phase AC motor to 380VAC. In the wiring configuration, the first terminal 1111 of each of the three intermittent contact portions 111 is electrically connected to the drive unit 503 via a power supply line 504. The three second terminals 1112a connected to the three intermittent contact portions 111 are connected to 380VAC via wires (not shown). The other second terminal 1112b of each of the three intermittent contact portions 111 is connected in parallel via wires (not shown) to the second terminal 1112a of the control switch 10 at the next station, thus enabling the control switches 10 at multiple stations to be connected in parallel. Optionally, the multiple stations included in the false-twist texturing machine independently form a yarn conveying path 70, and the yarn on each yarn conveying path 70 is conveyed by one or more yarn guiding devices 100 in a multi-winding manner. The control switch 10 is located on the back of the mounting plate 505 and controls the on or off of the drive device 503.

[0069] The switch shaft 12 has at least one second cam 123 that interacts with the intermittent contact portion 111, specifically three second cams 123, each of which individually controls the switching on and off of the three-phase AC power supply lines. The outer edge of the second cam 123, where the recessed area 1231 is not formed, forms a continuous arc surface, preferably a circular arc surface 1232. This allows the knob 17 to achieve a larger and more pronounced rotation angle when the protrusion 1113 is abutted against the circular arc surface 1232. The intermittent contact portion 111 protrudes towards the second cam 123 to form a protrusion 1113, and the second cam 123 correspondingly forms a recessed area 1231 for accommodating the protrusion 1113. The contact switch 11 also includes a second elastic element 112, with the intermittent contact portion 111 formed at one free end of the second elastic element 112, and the other free end of the second elastic element 112 held against the housing 15. The intermittent contact portion 111 is elastically held by the second elastic element 112, so that the intermittent contact portion 111 always has a tendency to move in the direction that makes the two contacts come into contact.

[0070] It should be noted that the switch shaft 12 has two stable rotational positions (i.e., the first rotational position 601 and the second rotational position 602), and the switch shaft 12 is formed by rotating along the first axis 60 in the first direction 603 or the second direction 604 to switch between the second rotational position 602 and the first rotational position 601. The switch shaft 12 acts on the contact switch 11. When the switch shaft 12 is in the first rotational position 601, the contact switch 11 is turned on, which enables the drive device 503 to be powered on and drives the conveyor roller 501 to rotate, and the guide yarn is wound in multiples. When the switch shaft 12 is in the second rotational position 602, the contact switch 11 is turned off, which enables the drive device 503 to be powered off and stops driving the conveyor roller 501 to rotate, and the yarn is not guided.

[0071] The drive arm 14 is axially connected to the switch shaft 12, that is, the drive arm 14 and one free end of the switch shaft 12 are fixedly connected. Thus, by pushing the drive arm 14 to rotate around the first axis 60, the switch shaft 12 can be driven to rotate around the first axis 60. The drive arm 14 can be part of the switch shaft 12, that is, the switch shaft 12 and the drive arm 14 are an integral structure; or the drive arm 14 and the switch shaft 12 can be regarded as two independent structural components, and the switch shaft 12 and the drive arm 14 can be axially movablely connected by installation methods such as interlocking along the direction of the first axis 60. This facilitates the installation and disassembly of the switch shaft 12 and the drive arm 14 and can reduce mold opening costs.

[0072] When the switch shaft 12 is held in the first rotational position 601, the preload 13 tightens and stores energy. When the switch shaft 12 is released from the constraint of the first rotational position 601 (e.g., the limiting member 162 disengages from the limiting groove 121), the energy stored in the preload 13 (e.g., the torsional force of the torsion spring) is released and pushes the drive arm 14 and the switch shaft 12 to twist, thereby applying a torsional force to the drive arm 14 to drive it to rotate along the first axis 60 and in the first direction 603. This torsional force is perpendicular to the first axis 60 to drive the switch shaft 12 to rotate, and under the impetus of the energy stored in the preload 13, the switch shaft 12 achieves a large-angle rotation, rotating to the second rotational position 602 and holding there.

[0073] In this embodiment, the torsional force applied by the preload element 13, such as the torsion spring, drives the drive arm 14 to rotate, thereby causing the switch shaft 12 to rotate at a large angle between the first rotation position 601 and the second rotation position 602. This clearly distinguishes whether the switch shaft 12 is in the first rotation position 601 or the second rotation position 602, thus distinguishing whether the power supply of the drive device 503 is on or off, solving the problem of unclear indication of the current working state of the yarn guiding device 100 by existing control switches. In particular, the knob 17 in this embodiment does not serve as a winding detector or yarn abnormality detection device as in the prior art, nor does it trigger the power-off operation of the drive device 503 (e.g., the motor driving the conveyor roller 501) based on the contact between the yarn and the knob 17. At the same time, if the knob 17 is used as a winding detector or yarn abnormality detection device and triggers the power-off operation, the switch device containing the winding detector or yarn abnormality detection device is easily affected by material aging or material fatigue, resulting in an irreversible decrease in the power-off sensitivity of the switch device. Furthermore, textile machinery such as false-twist texturing machines operate in high-temperature environments, with indoor temperatures exceeding 60 degrees Celsius in summer, leading to a decrease in detection sensitivity. Therefore, the control switch 10 disclosed in this embodiment, compared to existing technologies that use a winding detector to trigger the power supply for shutdown, can maintain detection sensitivity and solves the technical problems of easy aging and insufficient rigidity of the plastic winding detector in high-temperature environments. In particular, plastic winding detectors are prone to expansion in high-temperature environments, further reducing the already small gap between the winding detector and the conveyor roller 501, which can lead to erroneous shutdown during normal conveying. The control switch 10 in the embodiments of this application solves the aforementioned technical problems.

[0074] Optionally, when the switch rotating shaft 12 is in the first rotation position 601, the knob 17 forms an angle nearly perpendicular to the horizontal plane; when the switch rotating shaft 12 is in the second rotation position 602, the following knob 17 forms an angle nearly horizontal to the horizontal plane, thus forming a large angle for the operator to clearly identify. Compared with the prior art in which the power-on and power-off of the driving device 503 are displayed only depending on the small angle change of the knob (usually not greater than 20 degrees), in this embodiment, the pre-tightening member 13 can increase the rotation angle of the switch rotating shaft 12 between two stable rotation positions, which is beneficial for the operator to accurately identify the power state of the driving device 503 and the working state of the yarn guiding device 100, thereby solving the problem that the indication of the state of the yarn guiding device 100 (i.e., normal state and abnormal state) in the prior art is not clear. The knob 17 in each embodiment of the present application is not used as a winding detector, nor does it need to form a small gap with the conveying roller 501. If the prior art technical means of forming a small gap between the rotatable winding detector and the conveying roller 501 is adopted for the stop control of the abnormal signal, it poses strict requirements on the installation and manufacture of the winding detector. Too large or too small gap will affect the stop control of the winding detector when yarn abnormality occurs. Therefore, the knob 17 is used for manual reset rotation or after the alarm body 333 issues an alarm, an alarm signal in the form of sound, light, etc. is used to notify the operator to manually rotate the knob 17 to cut off the power supply of the driving device 503.

[0075] Refer Figure 1 , Figure 3 and Figure 9 As shown, the control switch 10 further includes: a housing 15 and a limiting component 16. The limiting component 16 includes a first elastic element 161 and a limiting member 162. The two free ends of the first elastic element 161 respectively abut against the limiting member 162 and the housing 15. The switch rotating shaft 12 forms a limiting groove 121 for actively limiting the limiting member 162. The switch rotating shaft 12 is jointly affected by the limiting member 162 and the limiting groove 121, so that the switch rotating shaft 12 is kept in the first rotation position 601 and a holding force is formed. This holding force is greater than the torsional force exerted by the pre-tightening member 13 on the driving arm 14 to rotate the switch rotating shaft 12 from the first rotation position 601 to the second rotation position 602, so as to ensure that the switch rotating shaft 12 can be kept in the first rotation position 601 under the action of this holding force. At the same time, the limiting member 162 is preferably in a cylindrical structure, and the circular ring surface of the limiting member 162 is kept in abutment with the outer edge contour of the first cam 122. The width of the limiting member 162 can be greater than or equal to the thickness formed by the outer edge contour of the first cam 122 along the first axis 60 direction.

[0076] The two free ends of the first elastic element 161 (e.g., a spring) abut against the limiting member 162 and the housing 15, respectively. The elastic force of the first elastic element 161 itself ensures that the limiting member 162 always tends to move in the direction of the switch shaft 12 and compresses the limiting member 162. When the switch shaft 12 is in the first rotation position 601, the switch shaft 12 forms a limiting groove 121 at the position corresponding to the limiting member 162, which cooperates with the limiting member 162, thereby restricting the limiting member 162 within the limiting groove 121 and holding the switch shaft 12 in the first rotation position 601. This effectively prevents the switch shaft 12 from rotating along the first axis 60 and in the first direction 603 due to unexpected factors such as vibration of textile machinery or accidental activation of the knob 17 described below, ensuring the stability of the switch shaft 12 when it is in the first rotation position 601. Meanwhile, the depth of the limiting groove 121 pointing in the radial direction of the switch shaft 12 is relatively shallow, so that when the drive arm 14 is subjected to the pushing force F applied by the actuator 1821 along the second axis 180 and along the third direction 605, the limiting member 162 can be quickly released from the limitation of the limiting groove 121, thereby enabling the switch shaft 12 to quickly rotate to the second rotation position 602 and maintain it under the action of the preload member 13.

[0077] As an optional method, refer to Figure 4 and Figure 9As shown, the switch shaft 12 has a first cam 122. The outer edge contour of the first cam 122 includes a limiting surface 1221 forming a limiting groove 121, and a rotating surface 1226a recessed into the first cam 122 relative to the limiting surface 1221. When the switch shaft 12 switches between a first rotation position 601 and a second rotation position 602, the limiting member 162 always abuts against the outer edge contour of the first cam 122 and slides between the limiting surface 1221 and the rotating surface 1226a. The limiting surface 1221 is generally arc-shaped to facilitate the sliding of the limiting member 162 along the limiting surface 1221. In particular, under the elastic force of the first elastic element 161, the limiting member 162 remains abutting against the outer edge contour of the first cam 122, that is, the limiting member 162 always fits against the outer edge contour of the first cam 122. The thickness of the first cam 122 forming the rotating surface 1226a in the radially inward direction pointing towards the switch shaft 12 is less than the thickness of the first cam 122 forming the limiting surface 1221 in the radially inward direction pointing towards the switch shaft 12. The rotating surface 1226a includes a sliding surface 1223 and a guide surface 1222 near the limiting surface 1221, with an abrupt transition between the sliding surface 1223 and the rotating surface 1226a via the guide surface 1222. When the limiting member 162 disengages from the limiting groove 121, it slides rapidly down the guide surface 1222 to the sliding surface 1223 based on the abrupt transition formed by the guide surface 1222. Since the limiting member 162 always abuts against the outer edge contour of the first cam 122, the limiting member 162 can apply radial extrusion force to the first cam 122, which is conducive to forcing the first cam 122 to further drive the switch shaft 12 to achieve a large angle rotation through the extrusion force, so as to form the second rotation position 602 under the synergistic effect of the preload member 13. At the same time, it is also conducive to quickly turning off multiple contact switches 11, thereby quickly controlling the power off of the drive device 503.

[0078] Specifically, refer to Figure 9As shown, when the switch shaft 12 rotates from the first rotation position 601 to the second rotation position 602, the limiting member 162 slides out of the limiting groove 121 and rotates along the limiting surface 1221 to the rotation surface 1226a. When the switch shaft 12 rotates from the second rotation position 602 to the first rotation position 601, the limiting member 162 rotates along the rotation surface 1226a to the limiting surface 1221, and slides into the limiting groove 121. Since the rotation surface 1226a is recessed relative to the limiting surface 1221 towards the switch shaft 12, that is, the distance between the limiting surface 1221 and the first axis 60 is greater than the distance between the rotation surface 1226a and the first axis 60. Therefore, when the limiting member 162 abuts against the limiting groove 121 formed by the limiting surface 1221, the first elastic element 161 experiences a relatively large compressive force, which helps to generate a stable supporting force on the limiting surface 1221. This further prevents the switch shaft 12 from rotating, keeping the switch shaft 12 stably in the first rotational position 601, and thus avoiding the control switch 10 from switching on to off due to machine vibration or slight misoperation. When the limiting member 162 abuts against the rotating surface 1226a, the first elastic element 161 elongates, thereby reducing the compressive force applied by the limiting member 162 to the outer edge contour of the first cam 122, and allowing the limiting member 162 to apply a smaller supporting force to the rotating surface 1226a. This facilitates the smooth rotation of the switch shaft 12 along the rotating surface 1226a under the action of external forces (such as the torsional force of the preload member 13 or the torsional force of the knob 17). Meanwhile, since the rotating surface 1226a is recessed radially inside the limiting surface 1221, during the rotation of the switch shaft 12 from the first rotation position 601 to the second rotation position 602, the rotational inertia formed by the guide surface 1222 included in the rotating surface 1226a, in conjunction with the preload 13, further facilitates the rotation of the switch shaft 12 from the first rotation position 601 to the second rotation position 602. Of course, it is also possible to rely solely on the torsional force of the preload 13 and increase this torsional force to drive the drive arm 14 to rotate, thereby rotating the switch shaft 12 from the first rotation position 601 to the second rotation position 602.

[0079] Specifically, refer to Figure 9As shown, the rotating surface 1226a includes a sliding surface 1223 and a guiding surface 1222 close to the limiting surface 1221. A sudden transition is formed between the sliding surface 1223 and the limiting surface 1221 through the guiding surface 1222. The limiting surface 1221 and the sliding surface 1223 can be curved surfaces, but embodiments where the limiting surface 1221 is configured as a flat straight surface are not excluded. The distance between the limiting surface 1221 and the first axis 60 is greater than the distance between the sliding surface 1223 and the first axis 60. Thus, when the switch rotating shaft 12 rotates from the first rotation position 601 to the second rotation position 602, the limiting member 162 slides along the limiting surface 1221 and along the guiding surface 1222 to the sliding surface 1223; when the switch rotating shaft 1十二经由第二旋转位置602转动至第一旋转位置601时,限位件162沿滑动面1223并沿导向面1222滑动至限位面1221。因此,在本公开中,转动面1226a可为连续沿径向向内延伸的面,还可以是先沿径向向内延伸再保持平滑的面(如前述导向面1222与滑动面1223),本实施例对此不作具体限定。通过设置导向面1222引导限位件162滑入或滑出限位槽121,能够使得限位件162의滑动过程更为顺畅,并减少滑动过程中的卡顿,同时能够减少外缘轮廓和限位件162的磨损。

[0080] As another alternative, refer to Figure 10 A corresponding optional embodiment of the control switch 10 is shown. In this embodiment, the rotating surface 1226b includes a sliding surface 1223 and a transition surface 1227 close to the limiting surface 1221. A continuous natural transition is formed between the limiting surface 1221 and the sliding surface 1223 through the transition surface 1227. The transition surface 1227 can be a flat inclined surface, or a curved surface radially recessed inward, or a curved surface radially protruding outward. Smooth transitions are formed at both ends of the transition surface 1227 with the sliding surface 1223 and the limiting surface 1221 to reduce the jamming and rotational resistance during the rotation of the switch rotating shaft 12. In this embodiment, since the rotating surface 1226b has a relatively long arc length, the limiting member 162 can be guided to slide into or out of the limiting groove 121 more smoothly through the transition surface 1227, making the sliding process of the limiting member 162 smoother, reducing the jamming during the sliding process, and being able to reduce the sliding wear generated between the outer edge contour of the first cam 122 and the limiting member 162, thereby extending the service life of the control switch 10. At the same time, since the guiding surface 1222 is cancelled, the resistance caused by the rotating surface 1226b to the limiting member 162 during the rotation from the second rotation position 602 to the first rotation position 601 is further reduced, having a good linear rotation feel.

[0081] Refer to Figure 6As shown, the housing 15 forms a limiting and holding cavity 163 for accommodating the first elastic element 161. Thus, the first elastic element 161 can be restricted by the limiting and holding cavity 163, so that the first elastic element 161 can only expand and contract in the vertical direction towards the first cam 122 and will not sway left and right. In particular, when the limiting member 162 is accommodated in the limiting groove 121, the limiting and holding cavity 163 can prevent the situation that the limiting member 162 slides out of the limiting groove 121 due to the left and right swaying of the first elastic element 161. When the switch rotating shaft 12 is not subjected to an external force greater than the holding force, the limiting member 162 can be restricted within the limiting groove 121 to further ensure the stability of the switch rotating shaft 12 in the first rotation position 601. The aforementioned holding force is formed by the elastic force exerted by the first elastic element 161 on the limiting member 162 and restricted by the limiting groove 121. The aforementioned external force can be understood as the pushing force F generated by the actuation rod 1821 pushing along the second axis 180 and in the third direction 605 and / or the torsional force generated by manually rotating the handle 17 on the switch rotating shaft 12. Combined with Figure 7 As shown, the first cam 122 forms a radially protruding portion 1220. The end plate 157 forms a relief cavity 164 communicating with the limiting and holding cavity 163. The thickness of the relief cavity 164 formed along the direction of the first axis 60 is greater than the thickness of the radially protruding portion 1220 formed along the direction of the first axis 60. The cross-section of the relief cavity 164 perpendicular to the direction of the first axis 60 is arcuate and can at least partially accommodate the radially protruding portion 1220 when the switch rotating shaft 12 is held in the first rotation position 601, which can play a role in further maintaining and limiting the rotational stability of the first cam 122. The end plate 157 has a certain thickness formed along the direction of the first axis 60. The limiting member 162 is always held in the limiting and holding cavity 163 to always keep the first elastic element 161 in a compressed state, so that the limiting member 162 always presses against the outer edge contour of the first cam 122.

[0082] Refer to Figure 1 and Figure 2As shown, the housing 15 is configured as a split structure to facilitate the installation and maintenance of the internal structural components of the housing 15. The housing 15 includes: a first housing 151, a second housing 152, a third housing 153, and an end plate 157 that are movably snap-fitted. Optionally, the end plate 157 and the third housing 153 or the first housing 151 form an integral structure. The first housing 151 and the second housing 152 are butt-jointed and enclosed to form a first shielding area 154 for accommodating structural components such as the following actuating device 18, circuit board 200, drive arm 14, and preloading member 13. The first housing 151, the third housing 153, and the end plate 157 are butt-jointed and enclosed to form a second shielding area 155 for accommodating structural components such as the following intermittent contact portion 111, second elastic element 112, first elastic element 161, limiting member 162, and switch rotating shaft 12. The free ends of the first elastic element 161 and the following second elastic element 112 are both abutted by the third housing 153 to provide a support basis for the first elastic element 161 and the second elastic element 112, ensuring that they can exert an elastic force on the limiting member 162 or on one end of the intermittent contact portion 111 close to the first terminal 1111. The first shielding area 154 and the second shielding area 155 communicate with each other.

[0083] Refer Figure 1 、 Figure 6 、 Figure 9 or Figure 10 As shown, the switch rotating shaft 12 passes out of the end plate 157 along the first axis 60. The end plate 157 is provided with a protruding portion 1571 that forms a limiting holding cavity 163. The protruding portion 1571 forms a first stopping portion 1572 and a second stopping portion 1573 on both sides of the limiting holding cavity 163 respectively. The first stopping portion 1572 and the second stopping portion 1573 are formed inside the end plate 157. It should be noted that the protruding portion 1571 belongs to a part of the end plate 157 and forms an integral structure. A first abutting surface 1224 that abuts against the first stopping portion 1572 is formed on one side of the limiting surface 1221 away from the rotating surface 1226a (or the rotating surface 1226b). A second abutting surface 1225 that abuts against the second stopping portion 1573 is formed on one side of the rotating surface 1226a (or the rotating surface 1226b) away from the limiting surface 1221. When the switch rotating shaft 12 is in the first rotation position 601 state and the first cam 122 abuts against the first stopping portion 1572 through the first abutting surface 1224, the switch 10 is controlled to be in the on state. When the switch rotating shaft 12 is in the second rotation position 602 state and the first cam 122 abuts against the second stopping portion 1573 through the first cam 122, the switch 10 is controlled to be in the off state.

[0084] When the switch shaft 12 rotates from the first rotation position 601 to the second rotation position 602, the limiting member 162 slides out of the limiting groove 121 and rotates along the limiting surface 1221 to the rotation surface 1226a (or rotation surface 1226b), and the second stop part 1573 and the second abutting surface 1225 abut against each other, which can limit the maximum rotation angle of the switch shaft 12 from the first rotation position 601 to the second rotation position 602, prevent the switch shaft 12 from over-rotating, and further ensure the stability of the switch shaft 12 in the second rotation position 602. Similarly, when the switch shaft 12 rotates from the second rotation position 602 to the first rotation position 601, the limiting member 162 rotates along the rotation surface 1226a (or rotation surface 1226b) to the limiting surface 1221, and the limiting surface 1221 slides into the limiting groove 121, and the first stop part 1572 and the first abutting surface 1224 abut against each other, which can limit the maximum rotation angle of the switch shaft 12 from the second rotation position 602 to the first rotation position 601, prevent the switch shaft 12 from over-rotating, and further ensure the stability of the switch shaft 12 in the first rotation position 601.

[0085] It should be noted that the shape of the first abutting surface 1224 and the second abutting surface 1225 is not specifically limited in this embodiment. They can be flat, curved, or other irregular surfaces, as long as the first stop 1572 and the first abutting surface 1224 abut against each other, and the second stop 1573 and the second abutting surface 1225 abut against each other, thereby limiting the rotation angle and rotation range of the switch shaft 12 by limiting the rotation of the first cam 122. This prevents the switch shaft 12 from over-rotating and ensures the stability of the switch shaft 12 when it is in the first rotation position 601 and the second rotation position 602. At the same time, the maximum rotation angle of the switch shaft 12 when rotating between the first rotation position 601 and the second rotation position 602 can also be controlled based on this. Therefore, by accurately controlling the rotation angle, the decrease in detection sensitivity of the control switch 10 after long-term operation and the inconsistency of rotation angle during the switching of the control switch 10 between the on and off states can be reduced.

[0086] When the switch rotating shaft 12 is in the first rotation position 601, the convex portion 1113 is accommodated in the recessed area 1231, and two contacts 1114 and 1115 of the intermittent contact portion 111 (hereinafter referred to as "two contacts") come into contact. At this time, the intermittent contact portion 111 is in a conducting state, and at this time, the control switch 10 is closed to control the power supply of the driving device 503 to be turned on. When the switch rotating shaft 12 is in the second rotation position 602, the second cam 123 abuts against the convex portion 1113, causing the two contacts of the intermittent contact portion 111 to separate. At this time, the intermittent contact portion 111 is in a cut-off state, and at this time, the control switch 10 is turned off to control the power supply of the driving device 503 to be turned off. When the switch rotating shaft 12 rotates from the first rotation position 601 to the second rotation position 602, the second cam 123 gradually rotates from a state of not contacting the convex portion 1113 to a state of abutting against the convex portion 1113, causing the two contacts of the intermittent contact portion 111 to separate and compressing the second elastic element 112 (for example, a spring). When the switch rotating shaft 12 rotates from the second rotation position 602 to the first rotation position 601 via the second rotation position 602, the second cam 123 gradually rotates from a state of abutting against the convex portion 1113 to a state of not contacting the convex portion 1113, and thus the two contacts of the intermittent contact portion 111 come into contact under the elastic force of the second elastic element 112.

[0087] In another example, the second elastic element 112 can be omitted, and the intermittent contact portion 111 itself is an elastic intermittent contact portion 111 and always has a tendency to move in a direction that makes the two contacts come into contact. Thus, when the switch rotating shaft 12 rotates from the second rotation position 602 to the first rotation position 601, the second cam 123 gradually rotates from a state of abutting against the convex portion 1113 to a state of not contacting the convex portion 1113, and thus the two contacts of the intermittent contact portion 111 come into contact under its own elastic force. The present disclosure does not make specific limitations on this.

[0088] Refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 12 and Figure 13 As shown in Figure 12 the first rotation position 601 in Figure 13The torsional force of the second rotational position 602 is applied to maintain the switch shaft 12 in the second rotational position 602. At this time, the first free end 131 and the second free end 132 of the torsion spring are far apart from each other, the torsion spring is extended, and the extension direction of the first free end 131 and the second free end 132 is perpendicular to the direction of rotation. Figure 5 The direction of the second axis 180 remains parallel.

[0089] At the same time, combined Figure 9 or Figure 10 As shown, when the torsion spring is extended along the second axis 180 and the third axis 605 by the actuating rod 1821, the pushing force F applied to the drive arm 14 is perpendicular to the first axis 60, and the pushing force F is separated from the first axis 60 to form a certain lever arm, which is conducive to applying a larger torque to the drive arm 14. This is beneficial to releasing the first rotational position 601, so as to release the torsion force stored in the torsion spring, so that the drive arm 14 can drive the switch shaft 12 to achieve a larger angle of rotation. As another option, the preload 13 can also be set as any other mechanical structure that can push the drive arm 14 to rotate axially, such as a spiral spring.

[0090] In some examples, the parameter Figure 3 , Figure 12 as well as Figure 13 As shown, the control switch 10 also includes a knob 17. The knob 17 is axially connected to the free end of the switch shaft 12, away from the drive arm 14 and protruding from the housing 15. The knob 17 drives the switch shaft 12 to switch between a first rotational position 601 and a second rotational position 602. The connection between the knob 17 and the switch shaft 12 is similar to the connection between the drive arm 14 and the switch shaft 12; that is, the knob 17 and the free end of the switch shaft 12 protruding from the housing 15 are fixedly connected. Thus, by driving the knob 17 to rotate axially around the first axis 60, the switch shaft 12 can be driven to rotate axially around the first axis 60. The knob 17 can be considered as part of the switch shaft 12; that is, the switch shaft 12 and the knob 17 are an integral structure. Alternatively, the knob 17 and the switch shaft 12 can be considered as two independent structural components, and fixedly connected by interlocking or other installation methods. This facilitates the installation and disassembly of the switch shaft 12 and the knob 17, and reduces mold costs. It should be noted that the knob 17 is an optional embodiment and can be considered as a handle (not shown), rocker arm (not shown), or any other type of component movably assembled with the switch shaft 12, and can also be considered as a reset component. Rotating the reset component rotates the control switch 10 from the second rotation position 602 to the first rotation position 601, thereby reconnecting the power supply to the drive device 503.

[0091] More specifically, participants Figure 8 and Figure 12As shown, the free end of the switch shaft 12 protruding from the housing 15 forms a straight portion 141. The knob 17 has a mounting hole 171 that fits onto the outside of the switch shaft 12. The straight portion 141 holds the knob 17, allowing the knob 17 and the switch shaft 12 to rotate synchronously. The operator can manually drive the knob 17 to rotate the switch shaft 12 from the first rotation position 601 to the second rotation position 602 (e.g., when the yarn is tangled but the power to the drive device 503 is not turned off), or from the second rotation position 602 to the first rotation position 601 (e.g., after the operator has resolved the yarn tangling problem).

[0092] In some examples, the yarn guiding device 100 further includes a detection module (not shown) provided to the conveying roller 501 and / or the guide roller 502. The detection module is used to detect the running status of the yarn in real time and outputs a corresponding detection signal when abnormalities such as yarn breakage or tangling occur. The abnormality detector is, for example, a yarn probe (not shown) or a detection module capable of detecting the running status of the yarn. In response to the detection signal, the control switch 10 is driven by the drive arm 14 to rotate the switch shaft 12 from the first rotational position 601 to the second rotational position 602 when the actuation device 18 is activated. Since the yarn probe (i.e., a specific concept of the detection module) and the detection signal output by the yarn probe are prior art, they will not be described in detail in this embodiment. It should be noted that the aforementioned detection signal can also be understood as being issued by a host computer (not shown) configured in textile machinery such as a false-twist texturing machine.

[0093] In some examples, the parameter Figure 15As shown, the control switch 10 includes a drive control circuit 20 and an actuator 18 controlled by the drive control circuit 20. The drive control circuit 20 includes a push-pull drive unit 202, an energy storage unit 203, a switch unit 204, a positive power supply terminal 205, a negative power supply terminal 206, and an enable signal input terminal 207. The push-pull drive unit 202 is connected between the positive power supply terminal 205 and the energy storage unit 203, and is also connected between the enable signal input terminal 207 and the switch unit 204. The switch unit 204 is electrically connected to the energy storage unit 203 and the actuator 18. An abnormality detector is electrically connected to the enable signal input terminal 207, and its output detection signal serves as the enable signal, used to trigger the drive control circuit 20 to activate the actuator 18 and control the actuator 18 to apply a pushing force F to the drive arm 14, rotating it from the second rotational position 602 to the first rotational position 601. In various embodiments of this application, the enable signal is understood as a level signal input to the control switch 10 by a detection device such as a yarn probe when a yarn abnormality occurs. Yarn abnormalities include, but are not limited to, yarn breakage or yarn tangling, and these abnormalities can be detected by the detection device such as a yarn probe, which then sends an enable signal to the control switch 10. Yarn tangling typically occurs on the surface of the conveyor roller 501 or in the gap between the conveyor roller 501 and the mounting plate 505. Therefore, upon receiving the enable signal, the power supply to the drive device 503 can be physically cut off by the control switch 10, and after the yarn abnormality is eliminated, the yarn threading operation or the yarn clearing operation can be re-executed.

[0094] Specifically, the switching unit 204 receives the enable signal output from the enable signal input terminal 207 (i.e., Figure 15 After the CTL signal in the energy storage unit 203 is turned on, the target voltage is output from the energy storage unit 203 to the actuator 18, and the actuator 18 applies a pushing force F to the switch shaft 12 via the drive arm 14, rotating it from the first rotational position 601 to the second rotational position 602. The target voltage is the driving voltage that can drive the actuator 18 to apply the pushing force F. In this disclosure, at least one capacitor (e.g., Figure 15The third capacitor C3 and the fourth capacitor C4 in the circuit output a target voltage to the actuator 18 to drive the actuator rod 1821 to extend and push the drive arm 14. This spark-free triggering structure is particularly suitable for use in textile machinery such as false twisting machines, winding machines, and drawing frames, where there is a risk of fire caused by static electricity or electric sparks. Therefore, the control switch 10 disclosed in this embodiment can effectively avoid the risk of fire and explosion caused by static electricity or electric sparks during the switching process. After the drive control circuit 20 is connected to a 24V DC power supply, it can charge quickly and, upon receiving an enable signal, can quickly output the target voltage applied by the drive actuator 18 to drive the switch shaft 12 to rotate from the first rotation position 601 to the second rotation position 602. This causes the second cam 123 to abut against the protrusion 1113 and causes the contacts 1114 and 1115 of the discontinuous contact portion 111 to separate, thereby directly turning off the power supply to the drive device 503. The aforementioned 24V DC power supply is provided by a switching power supply (not shown) configured in the textile machinery (e.g., a false twist texturing machine).

[0095] Furthermore, participants Figure 15 As shown, the push-pull drive unit 202 includes a first transistor Q1 and a second transistor Q2. The energy storage unit 203 includes an energy storage circuit 213, which includes at least one capacitor. The switching unit 204 includes a field-effect transistor Q3 and a load output interface 214, which includes a first output terminal (i.e., ...). Figure 15 Pin 1 of the medium load output interface 214) and the second output terminal (i.e., Figure 15 Pin 2 of the load output interface 214. The positive power supply terminal 205 is electrically connected to the collector of the first transistor Q1, the base of the first transistor Q1 is electrically connected to the collector of the second transistor Q2, an energy storage circuit 213 is connected in parallel between the emitters of the first transistor Q1 and the emitters of the second transistor Q2, the positive terminal of a capacitor (e.g., a third capacitor C3 and / or a fourth capacitor C4) is electrically connected to the first output terminal of the load output interface 214, the negative terminal of the capacitor is grounded, the enable signal input terminal 207 is electrically connected to the gate G of the field-effect transistor Q3, the base of the second transistor Q2 is connected between the enable signal input terminal 207 and the gate G of the field-effect transistor Q3, the drain D of the field-effect transistor Q3 is electrically connected to the second output terminal of the load output interface 214, and the source of the field-effect transistor Q3 is electrically connected to the negative power supply terminal 206 and is grounded together. In some examples, both the first transistor Q1 and the second transistor Q2 are selected from MMBT5551. The field-effect transistor Q3 is selected from YJD45G10A, and the load output interface 214 is selected from HY2.02PZZ. The electromagnetic drive unit 182 connected to the load output interface 214 is regarded as a load. In the actual circuit, the two output terminals of the load output interface 214 can be equivalently understood as two wires connected to and charging the coil described below.

[0096] Furthermore, the drive control circuit 20 also includes an input protection unit 201, which is connected between the positive terminal of the power supply 205 and the push-pull drive unit 202. The input protection power supply 201 includes a first diode D1, a first resistor R1, a second resistor R2, and a fourth resistor R4. The anode of the first diode D1 is connected to the positive terminal of the power supply 205. The cathode of the first diode D1 and the collector of the first transistor Q1 are connected in series with the first resistor R1 and the second resistor R2. The cathode of the first diode D1 and the collector of the second diode D2 are connected in series with the fourth resistor R4. The base of the first transistor Q1 is connected between the fourth resistor R4 and the collector of the second transistor Q2. The fifth power supply terminal 208 and the fourth resistor R4 are both connected between the cathode of the first diode D1 and the first resistor R1.

[0097] The push-pull drive unit 202 also includes a third diode D3 and a fifth resistor R5. The third diode D3 is electrically connected between the enable signal input terminal 207 and the gate G of the field-effect transistor Q3, and the fifth resistor R5 is connected in series between the cathode of the third diode D3 and the base of the second transistor Q2.

[0098] The energy storage unit 203 further includes a third resistor R3, and the energy storage circuit 213 includes a third capacitor C3 and a fourth capacitor C4. The third capacitor C3 and the fourth capacitor C4 are connected in parallel between the emitter of the first transistor Q1 and the emitter of the second diode D2. The third resistor R3 is connected in parallel between the positive terminals of the third capacitor C3 and the fourth capacitor C4 and the ground terminal. The negative terminals of the third capacitor C3 and the fourth capacitor C4, as well as the third resistor R3, are all grounded.

[0099] The switching unit 204 further includes: a second diode D2, a ninth resistor R9, and an eleventh resistor R11. The cathode of the second diode D2 is electrically connected to the negative terminals of the three capacitors C3 and C4, and the third resistor R3, respectively, and the cathode of the second diode D2 is electrically connected to the first output terminal of the load output interface 214. The drain D of the field-effect transistor Q3 is electrically connected to the anode of the second diode D2 and the second output terminal of the load output interface 214, respectively. The cathode of the third diode D3 is connected in series with the gate G of the field-effect transistor Q3, and the ninth resistor R9 is connected in series, and the fifth resistor R5 is connected between the cathode of the third diode D3 and the ninth resistor R9. The eleventh resistor R11 is connected in parallel between the gate G and the source S of the field-effect transistor Q3, and the eleventh resistor R11 and the source S of the field-effect transistor Q3 are grounded together. The eleventh resistor R11 is a pull-down resistor to ensure that the field-effect transistor Q3 is initially in the off state. The first diode D1, the second diode D2, and the third diode D3 are all used for reverse connection protection, freewheeling, and signal isolation.

[0100] In this disclosure, the drive control circuit 20 switches between the pre-charging stage and the normal output stage by controlling the high and low levels of the enable signal input terminal 207, based on whether an enable signal is received. In specific applications, the drive control circuit 20 divides the process into three stages based on whether the enable signal input terminal 207 is at a low or high level: the charging stage (when the enable signal input terminal 207 is at a low level), the shutdown stage (when the enable signal input terminal 207 switches from low to high), and the reset stage (when the enable signal input terminal 207 switches from high to low). When the enable signal input terminal 207 receives an enable signal, it is at a high level; when it does not receive an enable signal, it is at a low level.

[0101] During the charging phase, the enable signal input terminal 207 does not receive an enable signal and is at a low level. The base of the first transistor Q1 is electrically connected to the fifth power supply terminal 208 through the fourth resistor R4 (i.e., the pull-down resistor), obtaining a forward bias current, and the first transistor Q1 is turned on. The base of the second transistor Q2 is electrically connected to the enable signal input terminal 207 through the third diode D3. Because the enable signal input terminal 207 is at a low level, there is no bias current at its base, thus turning off the second transistor Q2 during the charging phase. The gate of the field-effect transistor Q3 is pulled down to the negative power supply terminal 206 through the eleventh resistor R11, and the field-effect transistor Q3 is turned off. The 24V+ DC power input at the positive terminal of the power supply 205 slowly charges the third capacitor C3 and the fourth capacitor C4 through the first diode D1, the first resistor R1, the second resistor R2 and the conducting first transistor Q1. The voltage across the third capacitor C3 and the fourth capacitor C4 gradually rises from 0V to close to 24V to eliminate the surge current at the moment of power-on.

[0102] During the turn-off phase, the enable signal input terminal 207 receives the enable signal and is at a high level. After being isolated by the third diode D3, the enable signal is transmitted to the base of the second transistor Q2. The base of the second transistor Q2 receives a forward bias current, and the second transistor Q2 immediately turns on. After the second transistor Q2 turns on, its collector pulls down the base potential of the first transistor Q1, causing the first transistor Q1 to lose its bias current and quickly turn off. Simultaneously with the turn-on of the second transistor Q2, the 24V+ DC power input at the positive terminal 205 is transmitted to the gate of the field-effect transistor Q3 through the ninth resistor R9, causing the gate-source voltage (Vgs) of the field-effect transistor Q3 to reach the turn-on threshold voltage (Vth), and the field-effect transistor Q3 turns on. The 24V+ DC power input at the positive terminal 205 is directly supplied to the load output interface 214 via the turned-on field-effect transistor Q3. As a result, the trigger actuator 1821 extends along the second axis 180 and the third direction 605 to push the drive arm 14, thereby applying a pushing force F to the switch shaft 12 to rotate from the first rotation position 601 to the second rotation position 602.

[0103] During the turn-off phase, the enable signal input terminal 207 does not receive an enable signal and is at a low level. Because there is no bias current at the base of the second transistor Q2, Q2 immediately turns off. The drive voltage of the field-effect transistor Q3 discharges rapidly through the fifth resistor R5, and the gate-source voltage drops below the turn-on threshold voltage, causing Q3 to turn off rapidly. After the second transistor Q2 turns off, the base of the first transistor Q1 receives a forward bias current again through the fourth resistor R4, and Q1 turns on. This triggers the actuator rod 1821 to retract along the second axis 180 and the fourth direction 606.

[0104] In some examples, the first diode D1, the second diode D2, and the third diode D3 are all selected from SM4007PL. The first resistor R1 and the second resistor R2 both have a resistance of 500Ω, and the third resistor R3, the fourth resistor R4, the fifth resistor R5, the ninth resistor R9, and the eleventh resistor R11 all have a resistance of 10kΩ. The third capacitor C3 and the fourth capacitor C4 both have a capacitance of 1000uF, and the voltage rating of the third capacitor C3 and the fourth capacitor C4 is 35V.

[0105] In one example, the parameter Figure 10 and Figure 16As shown, the control switch 10 further includes: a signal driving circuit 30 and a magnetic element 184 disposed on the switch shaft 12 and rotating synchronously with the switch shaft 12. The signal driving circuit 30 includes: a differential signal driving unit 301, an alarm device driving unit 302, and an alarm device 303. The differential signal driving unit 301 includes: a logic gate chip U2 and a Hall element U3. The logic gate chip U2 is an XOR gate chip. For example, the logic gate chip U2 is selected from TP74LVC1G86S5, the Hall element U3 is selected from SL1613SH, ​​and the fourth transistor Q4 is selected from MMBT555T.

[0106] The alarm device drive unit 302 includes a fourth transistor Q4. The alarm device 303 includes an alarm body 333, an alarm body positive terminal 313 and an alarm body negative terminal 323 electrically connected to the alarm body 333. The first data input terminal (i.e., terminal A) of the logic gate chip U2 is electrically connected to the enable signal input terminal 207, the second data input terminal (i.e., terminal B) of the logic gate chip U2 is electrically connected to the OUT terminal of the Hall element U3, the VDD terminal of the Hall element U3 is electrically connected to the first power supply terminal 304, the VCC terminal of the logic gate chip U2 is electrically connected to the second power supply terminal 305, the data output terminal (i.e., terminal Y) of the logic gate chip U2 is electrically connected to the base of the fourth transistor Q4, the collector of the fourth transistor Q4 is electrically connected to the third power supply terminal 306, the emitter of the fourth transistor Q4 is electrically connected to the positive terminal 313 of the display body of the alarm device 303, and the negative terminal 323 of the display body of the alarm device 303 is grounded. In this embodiment, Hall element U3 detects the change in magnetic field of magnetic element 184 to determine whether the switch shaft 12 is in the first rotational position 601 or the second rotational position 602, and outputs a position status signal. Logic gate chip U2 compares the enable signal and the position status signal, and outputs a control signal based on the comparison result to control the alarm device 303 to turn on or off. When the control signal is high, the fourth transistor Q4 is turned on, and the alarm device 303 is turned on; when the control signal is low, the fourth transistor Q4 is turned off, and the alarm device 303 is turned off. Magnetic element 184 can be understood as a magnetic component or a ferromagnetic component in this embodiment.

[0107] Furthermore, the differential signal driving unit 301 also includes: a seventh resistor R7, an eighth resistor R8, a tenth resistor R10, and a thirteenth resistor R13. The seventh resistor R7 is connected in series between the enable signal input terminal 207 and the first data input terminal (i.e., terminal A) of the logic gate chip U2. The eighth resistor R8 is connected in parallel between the first data input terminal (i.e., terminal A) of the logic gate chip U2 and the ground terminal (i.e., GND terminal) of the logic gate chip U2. The thirteenth resistor R13 is connected in parallel between the VDD terminal and the OUT terminal of the Hall element U3. The tenth resistor R10 is connected in series between the base of the fourth transistor Q4 and the data output terminal (i.e., terminal Y) of the logic gate chip U2.

[0108] More specifically, the Hall element U3 is disposed on the back side of the circuit board 200 described below, corresponding to the position of the magnetic element 184 when the switch shaft 12 is in the first rotation position 601. When the Hall element U3 detects the target magnetic field (the magnetic field when the Hall element U3 is close to the magnetic element 184), the transistor (not shown) inside the Hall element U3 conducts, the VDD terminal of the Hall element U3 is grounded, and the OUT terminal of the Hall element U3 outputs a low level. When the Hall element U3 does not detect the target magnetic field, the transistor inside the Hall element is cut off, the VDD terminal of the Hall element U3 is electrically connected to the first power supply terminal 304 through the thirteenth resistor R13, and the OUT terminal of the Hall element U3 outputs a high level.

[0109] The alarm device drive unit 302 further includes a sixth resistor R6. The sixth resistor R6 is connected in series between the collector of the fourth transistor Q4 and the third power supply terminal 306. In some examples, the resistance value of the sixth resistor R6 is 500Ω, the resistance value of the seventh resistor R7 is 10kΩ, and the resistance values ​​of the eighth resistor R8, the tenth resistor R10, and the thirteenth resistor R13 are all 2kΩ. The alarm body 333 can be, for example, a device capable of displaying a fault, such as an LED light; this disclosure does not specifically limit its application.

[0110] Specifically, when the enable signal input terminal 207 receives an enable signal, the first data input terminal (i.e., terminal A) is at a high level; when the enable signal input terminal 207 does not receive an enable signal, the first data input terminal (i.e., terminal A) is at a low level. When the OUT terminal of the Hall element U3 receives a position status signal indicating that the switch shaft 12 is in the first rotation position 601 (i.e., the Hall element U3 detects the magnetic field of the magnetic element 184), the second data input terminal (i.e., terminal B) is at a low level; when the OUT terminal of the Hall element U3 receives a position status signal indicating that the switch shaft 12 is in the second rotation position 602 (i.e., the Hall element U3 does not detect the magnetic field of the magnetic element 184), the second data input terminal (i.e., terminal B) is at a high level.

[0111] When both the first and second data input terminals of logic gate chip U2 are at a high level, the data output terminal (i.e., the Y terminal) of logic gate chip U2 outputs a low-level control signal; when both the first and second data input terminals of logic gate chip U2 are at a low level, the data output terminal (i.e., the Y terminal) of logic gate chip U2 outputs a low-level control signal; when the first data input terminal of logic gate chip U2 is at a high level and the second data input terminal is at a low level, the data output terminal (i.e., the Y terminal) of logic gate chip U2 outputs a high-level control signal; when the first data input terminal of logic gate chip U2 is at a low level and the second data input terminal is at a high level, the data output terminal (i.e., the Y terminal) of logic gate chip U2 outputs a high-level control signal.

[0112] When the data output terminal (i.e., Y terminal) of logic gate chip U2 outputs a high-level control signal, the fourth transistor Q4 is saturated and turned on, and the alarm device 303 is turned on (e.g., the LED light is turned on); when the data output terminal (i.e., Y terminal) of logic gate chip U2 outputs a low-level control signal, the fourth transistor Q4 is turned off, and the alarm device 303 is turned off (e.g., the LED light is turned off).

[0113] In case of abnormal conditions, the alarm device 303 is activated and issues an alarm, allowing operators to clearly distinguish the abnormal yarn guide device 100. Abnormal conditions include: the enable signal input terminal 207 receiving an enable signal (i.e., the first data input terminal is at a high level), and the OUT terminal of the Hall element U3 receiving a position status signal indicating that the switch shaft 12 is in the first rotational position 601 (i.e., the second data input terminal is at a low level); or, the enable signal input terminal 207 not receiving an enable signal (i.e., the first data input terminal is at a low level), and the OUT terminal of the Hall element U3 receiving a position status signal indicating that the switch shaft 12 is in the second rotational position 602 (i.e., the second data input terminal is at a high level).

[0114] In practical applications, when an enable signal is received and the position status signal indicates that the switch shaft 12 is in the first rotational position 601, the alarm body 333 is controlled to output a first alarm signal. When no enable signal is received and the position status signal indicates that the switch shaft 12 is in the second rotational position 602, the alarm body 333 is controlled to output a second alarm signal. The first and second alarm signals can be the same alarm signal (e.g., an alarm light of the same color) or different alarm signals (e.g., alarm lights of different colors). This disclosure does not specifically limit this, but it is preferable to use different alarm signals. For example, when the switch shaft 12 is in the first rotational position 601, the LED is green, and when the switch shaft 12 is in the second rotational position 602, the LED is red. This allows for the differentiation of different abnormal situations.

[0115] In one example, the parameter Figure 17 As shown, the control switch 10 also includes a voltage conversion circuit 40. The voltage conversion circuit 40 includes a linear regulator U1. The IN terminal of the linear regulator U1 is electrically connected to the fourth power supply terminal 401, and the OUT terminal of the linear regulator U1 is electrically connected to the VCC terminal of the logic gate chip U2 and the VDD terminal of the Hall element U3. The OUT terminal of the linear regulator U1 outputs low-voltage DC power. Optionally, the linear regulator U1 is selected from TLP820F33. The low-voltage DC power can be 5VDC, 3.3VDC, or 1.8VDC, etc.

[0116] Furthermore, the voltage conversion circuit 40 also includes a first capacitor C1 and a second capacitor C2 to ensure the stability of the voltage conversion and to reduce ripple and noise at the IN terminal and OUT terminal of the linear regulator (i.e., Low Dropout Linear Regulator, LDO) U1. The second capacitor C2 is connected in parallel between the OUT terminal and the GND terminal of the linear regulator U1 to filter the output voltage. The first capacitor C1 is connected in parallel between the IN terminal and the GND terminal of the linear regulator U1 to filter the input voltage (i.e., VCC). This voltage conversion circuit 40 can convert the higher voltage of the power supply into a clean, stable low-voltage DC (e.g., 5VDC, 3.3VDC, or 1.8VDC), and output it from the OUT terminal of the linear regulator U1 to electrically connect to the VCC terminal of the logic gate chip U2 and the VDD terminal of the Hall element U3 to provide the operating voltage.

[0117] In some examples, the capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 are both 100nF. It should be noted that the aforementioned first resistor R1, second resistor R2, fifth resistor R5, sixth resistor R6, eighth resistor R8, ninth resistor R9, tenth resistor R10 and thirteenth resistor R13 are all current-limiting resistors, the third resistor R3, fourth resistor R4 and eleventh resistor R11 are all pull-down resistors, and the seventh resistor R7 is a pull-up resistor.

[0118] In some examples, the parameter Figure 4 As shown, the control switch 10 further includes a circuit board 200 disposed in the first shielding area 154, and the circuit board 200 is disposed on the side of the drive arm 14 facing away from the switch shaft 12, with a gap formed between the circuit board 200 and the drive arm 14. The aforementioned drive control circuit 20, signal drive circuit 30, and voltage conversion circuit 40 are all disposed on the circuit board 200. (Combined with...) Figure 1As shown, the circuit board 200 may form an interface 210 exposed to the housing 15. The interface 210 belongs to the circuit board 200 and forms five metal contacts. The aforementioned five metal contacts respectively form a positive power supply terminal 205, a negative power supply terminal 206, an enable signal input terminal 207, a positive alarm body terminal 313, and a negative alarm body terminal 323. The interface 210 may also be regarded as a plug or socket of an electrical connector.

[0119] In some examples, the positive terminal 205 of the power supply is connected to 24V+, and the negative terminal 206 is connected to 24V-. The third power supply terminal 306, the fourth power supply terminal 401, and the fifth power supply terminal 208 are all VCC terminals. The voltage of the first power supply terminal 304 can be 1.8V, 3.3V, or 5V, etc., and the voltage of the second power supply terminal 305 can be 1.8V, 3.3V, or 5V, etc.; this disclosure does not specifically limit these values. The OUT terminal of the linear regulator U1 is connected to the second power supply terminal 305 and the second power supply terminal 305.

[0120] In one example, the parameter Figure 5 As shown, the actuation device 18 includes: a fixed base 181, an electromagnetic drive unit 182 disposed on the fixed base 181, and a reset member 183. The fixed base 181 is fixedly disposed on the side of the abutment portion 156 facing away from the drive arm 14, and the fixed base 181 can be regarded as part of the housing 15. The electromagnetic drive unit 182 is disposed within the support area 1811 formed by the fixed base 181. The electromagnetic drive unit 182 includes: an actuating rod 1821 and a coil (not shown) surrounding the outer periphery of the actuating rod 1821. The coil is electrically connected to the load output interface 214. The two free ends of the actuating rod 1821 pass through both sides of the fixed base 181 respectively. The axis of the actuating rod 1821 (i.e., the second axis 180) may intersect with the drive arm 14, or it may not. It is connected to the drive arm 14 through a common mechanism (not shown) and can satisfy the purpose of driving the drive arm 14 to rotate. The reset member 183 is sleeved on the free end of the actuator rod 1821 away from the drive arm 14 and protruding from the fixed seat 181, and the end of the actuator rod 1821 away from the drive arm 14 extends laterally to form a support plate 1831, and the reset member 183 abuts between the fixed seat 181 and the support plate 1831.

[0121] When the drive control circuit 20 energizes the coil through the load output interface 214, the actuator rod 1821 extends along its own axis (i.e., the second axis 180) in the third direction 605 to perform a pushing action on the drive arm 14 in the third direction 605, thereby applying a pushing force F to the switch shaft 12 as it rotates from the first rotation position 601 to the second rotation position 602. At this time, the reset member 183 is compressed between the abutment plate 1831 and the fixed seat 181 to accumulate energy. It should be noted that this pushing force F is greater than the holding force (not marked) formed by the limiting groove 121 restricting the limiting member 162, so that after the actuator rod 1821 performs the pushing action on the drive arm 14, the limiting member 162 can disengage from the limiting groove 121 restricting the limiting member 162. When the drive control circuit 20 stops energizing the coil through the load output interface 214, the actuator 1821 is forced by the reset member 183 to retract in the opposite direction to the drive arm 14. That is, the energy stored in the reset member 183 is released, pushing the abutment plate 1831 to cause the actuator 1821 to retract along its own axis (i.e., the second axis 180) in the fourth direction 606, and causing the actuator 1821 to remove the pushing force F applied to the drive arm 14. Manually turning the knob 17 causes the switch shaft 12 to rotate back from the second rotation position 602 to the first rotation position 601, and re-establishes the restriction formed by the limiting groove 121 on the limiting member 162 to facilitate stable maintenance in the first rotation position 601.

[0122] Based on the aforementioned technical solution, this disclosure also discloses a specific embodiment of the yarn guiding device 100.

[0123] The yarn guiding device 100 in this embodiment includes: at least one driven conveyor roller 501, a guide roller 502 cooperating with the conveyor roller 501, a driving device 503 for driving the conveyor roller 501, and a control switch 10. The conveyor roller 501 and the guide roller 502 partially wind the guide yarn, which includes, but is not limited to, chemical fibers such as nylon, polyester, spandex, polypropylene, and aramid, or natural fibers such as cotton and linen, or blended fibers formed by blending chemical fibers and natural fibers. When an abnormal situation occurs such as yarn breakage or yarn accumulation and entanglement on a yarn conveying path, an abnormal signal is generated and a corresponding enable signal is generated, which is sent to the control switch 10. Ultimately, the control switch 10 cuts off the power supply to the driving device 503 located on the back of the mounting plate 505 that drives the conveyor roller 501, and can achieve very fast and delay-free power cut-off of the driving device 503 to prevent overload, overheating, or even burnout of the driving device 503.

[0124] In particular, the control switch 10 can apply a torsional force to the drive arm 14 via the preload 13 to rotate the switch shaft 12 from the first rotation position 601 to the second rotation position 602, and keep the switch shaft 12 in the second rotation position 602. This allows the switch shaft 12 to rotate at a large angle between the first rotation position 601 and the second rotation position 602, thereby clearly distinguishing whether the switch shaft 12 is in the first rotation position 601 or the second rotation position 602. This also allows distinguishing whether the power supply of the drive device 503 is on or off, solving the problem of unclear status indication in the existing yarn guide device 100.

[0125] A motor (i.e., a subordinate concept of the drive unit 503) is directly mounted on the conveyor roller 501 in the axial direction. The switch shaft 12 is preferably rotatably supported substantially parallel to the axis of the conveyor roller 501, allowing the control switch 10 to rotate rapidly from a first rotational position 601 to a second rotational position 602 under the control of an enable signal. The first rotational position 601 constitutes the normal operating position of the motor, enabling the conveying of yarn in a multi-winding manner; the second rotational position 602 constitutes the interrupted operating position of the motor, where the motor stops rotating and the yarn cannot be conveyed by the yarn guide device 100. The guide roller 502 is rotatably held on the mounting plate 505 by a shaft 512, and the conveyor roller 501 is connected to the drive unit 503 via a drive shaft 511. The drive unit 503 is connected to the control switch 10 via multiple power supply lines 504.

[0126] The technical solution of the control switch 10 included in the yarn guiding device 100 disclosed in this embodiment is described in several embodiments of the control switch 10 mentioned above, and will not be repeated here.

[0127] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A control switch for a yarn guiding device in textile machinery, the yarn guiding device comprising: A conveying roller and a drive device for driving the conveying roller, characterized in that the control switch includes: A contact switch is used to control the power supply to and from the drive device. A switch shaft acts on the contact switch, and the switch shaft rotates to form a first rotational position where the power to the drive device is turned on and a second rotational position where the power to the drive device is turned off. The preload is coupled to the switch shaft; The drive arm is axially connected to the switch shaft; The preload applies a torsional force to the drive arm to drive the switch shaft to rotate from the first rotation position to the second rotation position, and keeps the switch shaft in the second rotation position; The control switch further includes a signal driving circuit and a magnetic element disposed on the switch shaft and rotating synchronously with the switch shaft. The signal driving circuit includes a differential signal driving unit, which includes a logic gate chip U2 and a Hall element U3. The Hall element U3 detects the switch shaft being in the first rotation position or the second rotation position by sensing the change in the magnetic field of the magnetic element and outputs a position status signal. The logic gate chip U2 compares the enable signal and the position status signal and outputs a control signal according to the comparison result to control the alarm device to be turned on or off.

2. The control switch according to claim 1, characterized in that, The control switch further includes: a housing and a limiting assembly, the limiting assembly including a first elastic element and a limiting member, the two free ends of the first elastic element respectively abutting against the limiting member and the housing, and the switch shaft forming a limiting groove that movably restricts the limiting member; The switch shaft is held in the first rotational position by the combined action of the limiting member and the limiting groove.

3. The control switch according to claim 2, characterized in that, The switch shaft has a first cam that abuts against the limiting member during rotation, and the housing forms a limiting and retaining cavity for accommodating the first elastic element; The outer edge contour of the first cam includes: a limiting surface forming the limiting groove, and a rotating surface recessed relative to the limiting surface onto the switch shaft; When the switch shaft switches between the first rotation position and the second rotation position, the limiting member abuts against the outer edge contour of the first cam and slides between the limiting surface and the rotation surface.

4. The control switch according to claim 3, characterized in that, The rotating surface includes a sliding surface and a guide surface near the limiting surface, wherein the sliding surface and the limiting surface form an abrupt transition through the guide surface, or... The rotating surface includes a sliding surface and a transition surface near the limiting surface, and the limiting surface and the sliding surface form a continuous natural transition through the transition surface.

5. The control switch according to claim 4, characterized in that, The housing includes a first housing, a third housing, and an end plate that are movably fastened together. The switch shaft passes through the end plate. The end plate has a protrusion that forms the limiting and retaining cavity. The protrusion forms a first stop and a second stop on both sides of the limiting and retaining cavity, respectively. The side of the limiting surface away from the rotating surface forms a first abutting surface that movably abuts against the first stop portion, and the side of the rotating surface away from the limiting surface forms a second abutting surface that movably abuts against the second stop portion. When the switch shaft is in the first rotational position, the first abutting surface abuts against the first stop portion; when the switch shaft is in the second rotational position, the second abutting surface abuts against the second stop portion.

6. The control switch according to claim 5, characterized in that, The first cam forms a radial protrusion; the end plate forms a relief cavity that communicates with the limiting and retaining cavity, and the thickness of the relief cavity along the direction of the first axis is greater than the thickness of the radial protrusion along the direction of the first axis.

7. The control switch according to claim 2, characterized in that, The preload is configured as a torsion spring; the housing forms a support portion that is fixed relative to one free end of the torsion spring, and the other free end of the torsion spring is fixed relative to the drive arm; the torsion spring applies a torsional force to the drive arm to drive the switch shaft to rotate from the first rotation position to the second rotation position, and holds the switch shaft in the second rotation position.

8. The control switch according to claim 7, characterized in that, The control switch further includes a knob, which is axially connected to the free end of the switch shaft away from the drive arm and protruding from the housing. The knob drives the switch shaft to switch between the first rotation position and the second rotation position.

9. The control switch according to any one of claims 1 to 8, characterized in that, The control switch includes: a drive control circuit and an actuator controlled by the drive control circuit; The drive control circuit includes: a push-pull drive unit, an energy storage unit, a switching unit, a positive power supply terminal, a negative power supply terminal, and an enable signal input terminal; The push-pull drive unit is connected between the positive terminal of the power supply and the energy storage unit, and the push-pull drive unit is connected between the enable signal input terminal and the switch unit. The switch unit is electrically connected to the energy storage unit and the actuation device. After receiving the enable signal input from the enable signal input terminal, the switching unit is turned on so that the energy storage unit outputs the target voltage to the actuation device, and the actuation device applies a pushing force to the switch shaft through the drive arm to rotate it from the first rotation position to the second rotation position.

10. The control switch according to claim 9, characterized in that, The push-pull drive unit includes: a first transistor Q1 and a second transistor Q2; The energy storage unit includes: an energy storage circuit, the energy storage circuit including at least one capacitor; The switching unit includes: a field-effect transistor Q3 and a load output interface; The positive terminal of the power supply is electrically connected to the collector of the first transistor Q1, the base of the first transistor Q1 is electrically connected to the collector of the second transistor Q2, the energy storage circuit is connected in parallel between the emitters of the first transistor Q1 and the emitters of the second transistor Q2, the positive terminal of the capacitor is electrically connected to the first output terminal of the load output interface, the negative terminal of the capacitor is grounded, the enable signal input terminal is electrically connected to the gate of the field-effect transistor Q3, the base of the second transistor Q2 is connected between the enable signal input terminal and the gate of the field-effect transistor Q3, the drain of the field-effect transistor Q3 is electrically connected to the second output terminal of the load output interface, and the source of the field-effect transistor Q3 is electrically connected to the negative terminal of the power supply and is grounded together.

11. The control switch according to claim 9, characterized in that, The control switch further includes: a voltage conversion circuit; The signal driving circuit further includes: an alarm device driving unit and an alarm device; The alarm device driving unit includes: a fourth transistor Q4, and the alarm device includes: an alarm body, an alarm body positive terminal and an alarm body negative terminal that are electrically connected to the alarm body respectively; The first data input terminal of the logic gate chip U2 is electrically connected to the enable signal input terminal; the second data input terminal of the logic gate chip U2 is electrically connected to the OUT terminal of the Hall element U3; the VDD terminal of the Hall element U3 is electrically connected to the first power supply terminal; the VCC terminal of the logic gate chip U2 is electrically connected to the second power supply terminal; the data output terminal of the logic gate chip U2 is electrically connected to the base of the fourth transistor Q4; the collector of the fourth transistor Q4 is electrically connected to the third power supply terminal; the emitter of the fourth transistor Q4 is electrically connected to the positive terminal of the display body of the alarm device; and the negative terminal of the display body of the alarm device is grounded. The voltage conversion circuit includes: a linear regulator U1, the IN terminal of which is electrically connected to the fourth power supply terminal, the OUT terminal of which is electrically connected to the VCC terminal of the logic gate chip U2 and the VDD terminal of the Hall element U3, and the OUT terminal of which outputs low-voltage DC power.

12. The control switch according to claim 10, characterized in that, The actuation device includes: a fixed base, an electromagnetic drive unit disposed on the fixed base, and a reset component; The electromagnetic drive unit includes: an actuator rod and a coil surrounding the outer periphery of the actuator rod, the coil being electrically connected to the load output interface, and the reset member abutting between the fixed base and the actuator rod; When the drive control circuit energizes the coil through the load output interface, the actuator rod extends to perform a pushing action on the drive arm, thereby applying a pushing force to the switch shaft to rotate from the first rotation position to the second rotation position. When the drive control circuit stops energizing the coil through the load output interface, the actuator is forced by the reset member to retract in the opposite direction to the drive arm.

13. A yarn guiding device, characterized in that, include: The conveying roller, the guide roller, the drive device for driving the conveying roller, and the control switch as claimed in any one of claims 1 to 12, wherein the conveying roller and the guide roller are wound with the guide yarn in multiple portions.

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