JP5281438B2 - Yarn cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thread cutting device capable of cutting a thread while suppressing lateral width and continuously retaining a thread end. <P>SOLUTION: The thread cutting device 1 in which a slit 27 for passing the thread is formed on one surface of a box body is provided with an electro-magnet mounting part 23b arranged opposed to a front surface of the box body; a core 15 of an electro-magnet mounted to the electro-magnet mounting part 23b such that one end surface is opposed to the front surface of the box body; an operation iron piece 16 and an attraction iron piece 13 having an attraction part 13a attracted to the electro-magnet and rocked in a horizontal direction making a fulcrum 19 provided on the electro-magnet mounting part 23b as a center; a cutting unit 12 mounted to a distal end of the attraction iron piece 13; and a spring 22 for urging the operation iron piece 16 and the attraction iron piece 13 in a direction in which the attraction part 13a is separated from the core 15 of the electro-magnet. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a yarn cutting device.

  A conventional yarn cutting device has a slit through which a yarn traveling from an upper yarn supplying bobbin to a lower winding bobbin passes and responds to an external signal (for example, a yarn detecting signal from a yarn detecting device). Thus, the yarn in the slit is cut and the cut yarn end is held (clip). In particular, in a configuration in which a plurality of yarns run in parallel, if the clip operation is not performed, the cut yarn end floats and a roller that is interposed between a neighboring yarn or a yarn feeding bobbin and a winding bobbin There is a risk of entanglement.

  This type of cutting device includes an electromagnet attached to a frame, a suction piece that has a cutter and a pressing piece at one end, and can be slid against the end surface (core) of the electromagnet, and one end is the other end of the suction piece. The other end is attached to the frame, and the spring is urged so as to separate the attraction piece from the electromagnet when not attracted, and the attraction attracted to the spring by attracting the attraction iron piece by the electromagnet There is a type in which the piece rotates in the horizontal direction and the cutter at one end of the suction piece cuts the yarn traveling in the vertical direction, and the holding piece holds the cut yarn end (for example, see Patent Document 1).

  In this case, the lateral width of the cutting device (the horizontal size of the end surface provided with the slit extending in the vertical direction) is reduced by disposing the peripheral surface of the coil of the electromagnet and the slit through which the yarn passes. Yes. In a configuration in which a plurality of parallel yarns are wound, the plurality of cutting devices can be arranged in the horizontal direction at the same height by reducing the lateral width of the cutting device as described above. Therefore, the installation space for the cutting device can be reduced.

  In addition, when the horizontal width of the cutting device is large, for example, a plurality of cutting devices are arranged (stacked) at different heights (see, for example, FIG. 9B described later).

JP-A-53-78237

  However, in the conventional yarn cutting device, the circumferential surface of the electromagnet (coil circumferential surface of the coil) and the slit are opposed to each other, so that the coil has a flat shape that is short in the axial direction, and the number of turns of the coil is limited. There was a problem that.

  In this case, a yarn cutting operation and a yarn end holding operation by so-called one-shot operation are possible, but it is difficult to keep the yarn end continuously because the number of turns of the coil is limited. Further, simply increasing the number of turns of the coil extends in the axial direction and increases the lateral width of the cutting device.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a yarn cutting device capable of cutting a yarn while suppressing a lateral width and continuously holding a yarn end. To do.

In the yarn cutting device of the present invention, a slit for allowing a yarn to pass therethrough is formed on one surface of the housing, and the yarn cutting device for cutting the yarn passing through the slit and holding the yarn end includes the housing. A plate member disposed to face one surface of the body, an electromagnet attached to the plate member so that one end surface thereof faces one surface of the housing, and a portion to be sucked by the electromagnet, A swinging member that swings in a horizontal direction around a fulcrum provided on a plate member; an auxiliary member that swings in a horizontal direction while maintaining parallel to the swinging member when the swinging member swings in the horizontal direction; and the swinging member A thread cutting holding member attached to the tip of the auxiliary member and the tip of the auxiliary member, a biasing member that biases the peristaltic member in a direction in which the attracted portion is separated from one end surface of the electromagnet, and one surface of the housing Other of the casing orthogonal to Mounted between the surface and the circumferential surface of the coil of the electromagnet, has a configuration and a control circuit board for controlling the energization of said coil.

According to this configuration, since one end surface of the electromagnet faces one surface (for example, the front surface) in which the slit is formed, the axis of the electromagnet coil is another surface (for example, the side surface) orthogonal to the one surface of the housing. ) And parallel. Therefore, it is possible to ensure the number of turns of the coil necessary to continue holding the yarn end in the axial direction while suppressing the lateral width (for example, the horizontal size of the front surface) of the yarn cutting device. In addition, since the control circuit board is attached to the gap between the circumferential surface of the coil of the electromagnet and the other surface (for example, the side surface) orthogonal to the one surface of the housing, the space in the housing can be effectively used. While suppressing an increase in size, complex control can be performed independently from the outside.
Further, according to this configuration, by arranging the one end surface of the electromagnet to face one surface of the housing in which the slit is formed, the lateral width of the device can be suppressed, and the peristaltic member and the auxiliary member are in the horizontal direction. The yarn cutting and holding member is held and the posture of the yarn cutting and holding member is stabilized and moved obliquely when turning, so that the yarn cutting and holding member presses and pulls against the yarn and cuts while continuing the yarn end. Can be held.

  In the yarn cutting device of the present invention, the control for controlling the energization of the coil between the other surface of the housing orthogonal to the surface of the housing and the peripheral surface of the coil of the electromagnet. The circuit board is attached.

  According to this configuration, since the control circuit board is attached to the gap between the circumferential surface of the coil of the electromagnet and the other surface (for example, the side surface) orthogonal to the one surface of the housing, the yarn can be effectively utilized in the space in the housing. While suppressing the enlargement of a strip cutting apparatus, complicated control can be performed independently from the outside.

  In the present invention, by arranging one end surface of the electromagnet to face one surface of the housing in which the slit is formed, the yarn end can be cut and the yarn end can be continuously held while suppressing the lateral width. It is possible to provide a yarn cutting device having the effect described above.

1 is a perspective view of a winding system according to an embodiment of the present invention. It is a top view of the yarn cutting device of one embodiment of the present invention. It is a side view of the yarn cutting device of one embodiment of the present invention. It is a front view of the yarn cutting device of one embodiment of the present invention. It is a timing chart concerning the drive of the yarn cutting device and yarn breakage detection device of one embodiment of the present invention. It is a 1st timing chart which concerns on the drive of the yarn cutting device of one Embodiment of this invention. It is a 2nd timing chart which concerns on the drive of the yarn cutting device of one Embodiment of this invention. It is a 3rd timing chart which concerns on the drive of the yarn cutting device of one Embodiment of this invention. It is a perspective view which shows arrangement | positioning of the yarn cutting device of one Embodiment of this invention.

  Hereinafter, a winding system provided with a yarn cutting device as an embodiment of the present invention will be described with reference to the drawings.

  A winding system as one embodiment of the present invention is shown in FIG.

  In FIG. 1, the winding system includes a yarn feeding bobbin 30 that feeds a yarn to be wound, and a first guide that clamps the yarn fed from the yarn feeding bobbin 30 and guides it to the winding bobbin 31. A roller 32, a second guide roller 33, a take-up bobbin 31 for winding the yarn fed from the yarn supplying bobbin 30 via the first guide roller 32 and the second guide roller 33, the yarn supplying bobbin 30, The yarn cutting device 1 disposed between the one guide roller 32 and the yarn breakage detecting device 34 disposed between the second guide roller 33 and the take-up bobbin 31.

  The first guide roller 32 and the second guide roller 33 rotate in the direction indicated by the arrows. Further, as indicated by other arrows, the shaft of the winding bobbin 31 rotates in the left-right direction (horizontal direction) according to winding, and the position of the winding yarn end (guide position) moves up and down.

  The yarn cutting device 1 has a control circuit board 18 and cuts a yarn traveling in a slit 27 formed on the front surface based on an operation signal (yarn signal) from the yarn breakage detection device 34. It has become. In FIG. 1, the control circuit board 18 is drawn out of the apparatus to show the configuration, but it is actually attached to the side plate 24 (see FIG. 2) of the housing.

The control circuit board 18 is connected to, for example, a controller 29 configured by a microprocessor, transistors (NPN) Q ₁ and Q ₂ for switching a current flowing through the electromagnet coil 14 (see FIG. 2), and the transistor Q ₁ . has been a diode D, a resistor R connected to the transistor Q _2, the return switch 37 for resetting connected to the controller 29.

  The yarn breakage detecting device 34 includes, for example, a transmission type optical sensor (not shown) including a light emitting unit and a light receiving unit that are arranged to face each other across a traveling yarn. Based on the output (detection signal) of the optical sensor, a yarn breaking signal is input (ON, OFF) to the controller 29. FIG. 1 shows a case where the running yarn is cut and the yarn end is wound around the second guide roller 33. In this case, the yarn breaking signal input to the controller 29 changes from OFF to ON (see FIG. 5).

  Next, the structure of the yarn cutting device 1 is shown in FIGS.

  As shown in FIGS. 2 to 4, the yarn cutting device 1 includes a cutter 12 having a cutter 28 and an elastic body 21 opposed to each other at an end, a working iron piece 16 and a suction iron piece 13 that are integrally formed. An electromagnet that attracts the attracting iron piece 13, a spring 22 that biases one end of the working iron piece 16 toward the side surface (side plate 24) of the housing, a control circuit board 18 that controls energization of the coil 14 of the electromagnet, It is the structure which has.

  The yarn cutting device 1 is covered with the cover 11 and the side plate 24, and the cover 11 and the side plate 24 form a casing. Further, the front cover 11 is formed with a slit 27 cut out in the vertical direction, and a guide 25 is attached to the upper and lower openings of the slit 27. The yarn is introduced into the slit 27 by the guide 25.

  The cutter 12 has a substantially U-shaped cross section (see FIG. 4), is attached to the engaging portion 13b of the suction iron piece 13, and is cut from an initial position (shown by a chain line in FIG. 2) (FIG. 2). (Shown by a solid line) in the horizontal direction. An elastic body 21 for pressing and holding the yarn end cut by the cutter 28 and a cutter 28 for cutting the yarn passing through the slit 27 are attached to the cutter 12 so as to face each other in the vertical direction. ing. The reason why the elastic body 21 is on the upper side (the yarn feeding bobbin 30 side) is to prevent the yarn end from floating and winding around the adjacent traveling yarn when the yarn of the yarn feeding bobbin 30 is cut. . An elastic plate 20 is attached to the control circuit board 18 (or the side plate 24) so as to face the blade of the cutter 28 and one surface of the elastic body 21. A thread that passes through the slit 27 is held by one surface of the elastic body 21 and the elastic plate 20, and the held yarn is cut while being pressed against the elastic plate 20 by a blade of a cutter 28.

  A partially bent rod-shaped auxiliary member 17 is attached to the upper part (the elastic body 21 side) of the cutter 12. The auxiliary member 17 has one end attached to the upper part of the cutter 12 and the other end attached to the upper end of the electromagnet attaching part 23b. The auxiliary member 17 is rotatable in the horizontal direction around the attachment portion of the electromagnet attachment portion 23b as the working iron piece 16 and the suction iron piece 13 turn.

  The auxiliary member 17 stabilizes the operation of the operating iron piece 16 when the concave portion of the operating iron piece 16 rotates in the horizontal direction around the fulcrum 19 (end surface of the electromagnet mounting portion 23b). When the operating iron piece 16 is stably rotated, the blade of the cutter 28 of the cutter 12 comes into close contact with the vertical plane of the elastic plate 20. Therefore, the yarn can be surely cut.

  In addition, since the attracting part 13a is obliquely attracted to the electromagnet core 15 by the rotation of the operating iron piece 16 and the attraction iron piece 13 when energized, the yarn is cut by the cutter 28. Compared with the case where the yarn is pressed, the contact portion between the yarn and the blade of the cutter 28 becomes larger (longer).

  The electromagnet is disposed so that the core 15 (end surface) of the electromagnet faces the front of the yarn cutting device 1 (the surface on which the slit 27 is opened in the vertical direction). The peripheral surface of the electromagnet coil 14 faces the side plate 24 and the control circuit board 18. Therefore, when the number of turns of the coil 14 is increased, the yarn cutting device 1 becomes larger in the axial direction of the coil 14, but the front width is not enlarged.

  One end of the spring 22 is attached to the center of the end of the spring attachment portion 23 a of the attachment member 23, and the other end is attached to the center in the longitudinal direction of the support member 26 spanned by the notches on the two end surfaces of the operating iron piece 16. Yes. At the time of de-energization, the spring 22 is contracted and a spring force is obtained, so that the operating iron piece 16 and the suction iron piece 13 are urged to rotate in the horizontal direction (counterclockwise in FIG. 2) about the fulcrum 19. . By this urging, the cutter 12 is held in the initial position. During energization, the suction portion 13a is attracted to the electromagnet core 15 as described above. By this suction, the working iron piece 16 and the suction iron piece 13 are rotated clockwise around the fulcrum 19 against the spring force of the spring 22, and the cutter 12 is moved horizontally to the cutting position (clockwise in FIG. 2). ).

  The control circuit board 18 is attached to the side plate 24 and controls the energization of the electromagnet coil 14 based on the yarn break signal from the yarn breakage detection device 34. As described above, since the end face of the electromagnet core 15 is opposed to the front face, the control circuit board 18 is disposed using the gap between the peripheral face of the coil 14 and the side plate 24. By providing the control circuit board 18 inside the yarn cutting device 1, it is possible to perform control relating to yarn cutting and yarn end holding without requiring an external signal other than the yarn cutting signal.

  Regarding the winding system configured as described above, the yarn cutting operation and the yarn end holding operation will be described with reference to FIG. FIG. 5A shows the operation timing of the yarn cutting device 1, and FIG. 5B shows the operation timing of the yarn cutting detection device 34.

  As shown in FIG. 5B, when the yarn breakage detecting device 34 detects the yarn breakage by the change of the optical sensor output (detection signal) (with yarn (ON) → no yarn (OFF)), the yarn cutting device 1 A yarn break signal is transmitted (set to ON). The output of the yarn breaking signal corresponds to an operation signal input in the yarn cutting device 1.

As shown in FIG. 5A, the yarn cutting device 1 inputs an operation signal (set to ON) based on the output of the yarn breaking signal in the yarn breaking detecting device 34. Based on the input of this operation signal, the controller 29 controls the transistors Q ₁ and Q ₂ to be ON (energized) so that the maximum current (MAX) flows through the coil 14 for T time. By this control, the working iron piece 16 and the suction iron piece 13 are rotated in the horizontal direction around the fulcrum 19, the yarn passing through the slit 27 is cut by the cutter 28, and the yarn end is the elastic body 21 and the elastic plate 20. Held by. Note that the operation signal is maintained in the ON or OFF state based on the output of the yarn breaking signal.

Then, the controller 29 together with the transistor _{Q 1} and OFF (non-energized), the transistor _{Q 2} and ON (energization). In this case, a current smaller than the maximum current (MAX) (current necessary for holding the yarn end) flows through the coil 14, and the yarn end after cutting is continuously held by the elastic body 21 and the elastic plate 20. Thereafter, when the return signal is turned on based on the operation of the return switch 37, the controller 29 turns off the transistors Q ₁ and Q ₂ (non-energized). Therefore, the coil 14 is in a non-energized state, and the suction of the attracting iron piece 13 by the electromagnet is released. On the other hand, by the spring force of the spring 22, the operating iron piece 16 and the suction iron piece 13 are rotated in the horizontal direction around the fulcrum 19, and the cutter 12 returns to the initial position.

  In this embodiment, the case where the return signal is turned on (output) based on the operation of the return switch 37 is shown. However, the present invention is not limited to this. It may be. Alternatively, the resetting may be performed based on a return signal from an external device (for example, a higher-level host computer).

  According to the yarn cutting device 1 as one embodiment of the present invention, the end surface of the electromagnet core 15 is opposed to the front surface of the casing in which the slit 27 is formed. Is parallel to the side plate 24 (side surface) orthogonal to the front surface of the housing. Therefore, the number of turns of the coil 14 necessary to continue holding the cut yarn end can be ensured while suppressing the front width (lateral width) of the yarn cutting device 1.

  In addition, according to the present embodiment, the working iron piece 16 and the suction iron piece 13 are configured to rotate around the fulcrum 19 of the upper end surface of the electromagnet mounting portion 23b. Hard to adhere. Therefore, it is possible to suppress a decrease in the cutting and holding function due to dirt.

  In the present embodiment, the operating iron piece 16, the suction iron piece 13, and the cutter 12 are rotated around the fulcrum 19. Here, the suction surface of the suction iron piece 13 (the surface that comes into contact with the core 15 of the electromagnet by suction) is the power point, and the blade of the cutter 28 of the cutter 12 is the action point. In this case, since the power point is inclined toward the electromagnet core 15 by energization, a sufficiently wide interval (width) from when the yarn contacts the point of action until it is cut can be secured. In addition, when the blade of the cutter 28 is in contact with the elastic plate 20 while maintaining a parallel state (when the blade is not skewed), the yarn is simply cut off.

  Further, since the power point is inclined toward the electromagnet core 15 by energization, the distance between the attracting iron piece 13 and the electromagnet core 15 is reduced (for example, see Patent Document 1), and the attraction force loss of the electromagnet is lost. Can be suppressed.

  Further, in the present embodiment, the suction part 13a of the working iron piece 16 and the suction iron piece 13 is formed of a plate-like member surrounding the electromagnet, and the left and right end faces of the working iron piece 16 and the front and back surfaces of the engaging part 13b are substantially parallel. In addition, the fulcrum 19 is behind the electromagnet (the upper end surface of the electromagnet mounting portion 23b). The working iron piece 16 is divided into two parts and faces the peripheral surface of the coil 14 of the electromagnet, and the suction part 13a faces the core 15 of the electromagnet. Therefore, even if the coil 14 of the electromagnet is extended in the axial direction, the distance between the fulcrum 19 and the action point can be secured, and a sufficient pressure can be applied to the action point. In addition, the front width (horizontal width) of the housing can be reduced.

  Further, according to the present embodiment, since the control circuit board 18 for controlling the energization of the coil 14 is attached between the side plate 24 orthogonal to the front of the casing and the axis of the coil 14, The space can be effectively utilized to prevent the yarn cutting device 1 from being enlarged, and the control circuit board 18 can perform complicated control independently from the outside.

  Not only the embodiment described above, but also the cutting and holding operation can be performed by providing the control circuit board 18 in the yarn cutting device 1. Other embodiments are shown in FIGS.

As shown in FIG. 6, the yarn cutting device 1 inputs an operation signal (set to ON) based on the output of the yarn breaking signal in the yarn breaking detecting device 34. Based on the input of this operation signal, the controller 29 controls the transistors Q ₁ and Q ₂ to be ON (energized) so that the maximum current (MAX) flows through the coil 14 for T time. Next, the controller 29 turns off the transistors Q ₁ and Q ₂ (non-energized). By this control, the yarn passing through the slit 27 is reset after being cut by the cutter 28 (the cutter 12 returns to the initial position), and the holding operation is not continuously performed. The operation signal may be one pulse (one-shot operation).

As shown in FIG. 7, the yarn cutting device 1 inputs an operation signal of one pulse based on the output of the yarn breaking signal from the yarn breaking detecting device 34 (set to ON). Based on the input of this one-pulse operation signal, the controller 29 controls the transistors Q ₁ and Q ₂ to be ON (energized) so that the maximum current (MAX) flows through the coil 14 for T time. Then, the controller 29 together with the transistor _{Q 1} and OFF (non-energized), the transistor _{Q 2} and ON (energization). By this control, the yarn passing through the slit 27 is cut by the cutter 28, and the yarn end is continuously held by the elastic body 21 and the elastic plate 20. Thereafter, when the return signal is turned on based on the operation of the return switch 37, the controller 29 turns off the transistors Q ₁ and Q ₂ (non-energized). Therefore, the controller 29 continues the holding operation until the return signal is turned on regardless of the change in the yarn break signal input from the yarn breakage detector 34.

As shown in FIG. 8, the yarn cutting device 1 inputs an operation signal (set to ON) based on the output of the yarn breaking signal in the yarn breaking detecting device 34. Based on the input of this operation signal, the controller 29 controls the transistors Q ₁ and Q ₂ to be ON (energized) so that the maximum current (MAX) flows through the coil 14 for T time. Then, the controller 29 together with the transistor _{Q 1} and OFF (non-energized), the transistor _{Q 2} and ON (energization). When the operation signal in a state to energize only the transistor _{Q 2} becomes OFF, the controller 29 makes the transistor _Q 1, _{Q 2} and OFF (non-energized). However, the operation signal is in ON (state energizing only the transistor _{Q 2),} the return signal is ON, the controller 29 makes the transistor _Q 1, _{Q 2} and OFF (non-energized). By this control, when the return signal is OFF, the yarn is cut and the yarn end is held based on the operation signal.

  In addition, according to each embodiment mentioned above, since it is not necessary to perform return operation | work manually, the winding process of winding bobbin 31 (The cutting | disconnection of the thread | yarn by the cutter 12 and the holding | maintenance operation | movement of a yarn end) is included. It becomes possible to automate. Furthermore, the yarn threading process in which the winding bobbin 31 is replaced and a new thread is threaded can be automated, for example, by substituting with a mechanical operation by a robot arm.

  Furthermore, the present invention is not limited to the above-described embodiments, and the cutter 28 may be removed from the cutter 12, and only the yarn end holding may be performed by a continuous operation or a one-shot operation. In this configuration, when the yarn is cut by another yarn cutting device and the yarn cutting device 1 holds the yarn end, the yarn is manually cut each time the winding bobbin 31 is completely wound. It can be applied to the case where the yarn cutting device 1 holds the yarn end.

  Moreover, according to each embodiment mentioned above, since the lateral width of the yarn cutting device 1 is suppressed, three or more winding bobbins can be arranged in parallel to efficiently use the space. This configuration is shown in FIG.

  As shown in FIG. 9A, the winding bobbins 31 are arranged adjacent to each other in parallel. A yarn is fed to each winding bobbin 31 via a plurality of first guide rollers 32 and second guide rollers 33. In this case, above each first guide roller 32, a plurality of yarn cutting devices 1a to 1c are arranged in parallel at the same height. When manually threading, the thread path of each slit 27 can be visually observed from the front at the same height. Therefore, the threading operation and the thread cutting device can be easily attached and detached.

  On the other hand, as shown in FIG. 9B, the lateral width of the yarn cutting devices 38a to 38c with respect to the radial size of the take-up bobbin 31 or the axial size of the first guide roller 32 is large. If it is large, it is difficult to arrange the yarn cutting devices 38a to 38c in parallel at the same height. In this case, for example, the yarn cutting device 38a is disposed above the yarn cutting devices 38b and 38c. Therefore, the arrangement space of the yarn cutting device is expanded, and the winding system is enlarged. In addition, when the threading is performed manually, the operation is not easy because the height of the threading changes. Similarly, it is not easy to attach and remove the yarn cutting device.

  In addition, it is also conceivable that the yarn cutting devices 38a to 38c are arranged in parallel at the same height with the front face sideways. However, when threading is performed manually, the operation is not easy because the thread path of the slit cannot be seen from the front.

  As described above, the yarn cutting device according to the present invention has an effect of cutting the yarn while suppressing the lateral width and continuously holding the yarn end, and is wound around the winding bobbin. It is useful as a yarn cutting device for cutting a yarn.

1, 1a, 1b, 1c Yarn cutting device 11 Cover 12 Cutting device (yarn cutting holding member)
13 Suction iron piece (suctioned part, peristaltic member)
13a Suction part 13b Engaging part 14 Coil (electromagnet)
15 Electromagnet core (electromagnet)
16 Operating iron pieces (peristaltic members)
17 Auxiliary member 18 Control circuit board 19 Support point 20 Elastic plate 21 Elastic body (thread cutting holding member)
22 Spring (biasing member)
23 Mounting member (plate member)
23a Spring mounting portion 23b Electromagnet mounting portion 24 Side plate 25 Guide 26 Support member 27 Slit 28 Cutter (thread cutting holding member)
29 controller 30 yarn feeding bobbin 31 take-up bobbin 32 first guide roller 33 second guide roller 34 yarn breakage detecting device 35, 36 yarn feeding guide 37 return switch 38a, 38b, 38c yarn cutting device

Claims (2)

In a yarn cutting device in which a slit for allowing the yarn to pass is formed on one surface of the housing, cutting the yarn passing through the slit and holding the yarn end,
A plate member disposed to face one surface of the housing;
An electromagnet attached to the plate member such that one end surface thereof faces one surface of the housing;
A peristaltic member that has a portion to be attracted by the electromagnet and swings in a horizontal direction around a fulcrum provided on the plate member;
An auxiliary member that swings in the horizontal direction while maintaining parallel with the swinging member when the swinging member swings in the horizontal direction ;
A thread cutting holding member attached to the tip of the peristaltic member and the tip of the auxiliary member ;
A biasing member that biases the peristaltic member in a direction in which the attracted portion is separated from one end surface of the electromagnet;
A control circuit board for controlling energization of the coil, which is attached between the other surface of the housing orthogonal to the surface of the housing and the peripheral surface of the coil of the electromagnet;
A yarn cutting device comprising:   The control circuit board for controlling energization of the coil is attached between the other surface of the housing orthogonal to the surface of the housing and the peripheral surface of the coil of the electromagnet. The yarn cutting device according to 1.

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