Thread tension regulating device for an embroidery machine

Abstract

The present invention relates to a thread tension adjusting device for an embroidery machine. The thread tension adjusting device for an embroidery machine according to an embodiment of the present invention is characterized in that, as a thread tension adjusting device for an embroidery machine, it is provided on an embroidery machine equipped with a needle bar, a thread tensioner, a bobbin, and a frame, and adjusts the tension of upper thread supplied to a needle on the needle bar from a bobbin through the thread tensioner; and includes a thread tension adjusting portion including a thread tensioner lever arranged on a moving path of the upper thread supplied to the needle after being drawn from the bobbin, which controls the amount of pulling of the upper thread when rotating in contact with the upper thread, and a first actuator that provides a rotational driving force to the thread tensioner lever; at least one thread guide adjusting portion including a pair of thread guides arranged on at least one of the front end and the rear end of the thread tension adjusting portion along the moving path of the upper thread, which controls the friction of the upper thread when passing through and being in close contact with each other in contact with the upper thread, and a second actuator that provides a driving force to the pair of thread guides; and a control portion that judges the driving state of at least one of the needle bar, the thread tensioner, the bobbin, and the frame according to each of a plurality of stitch information included in embroidery data, and controls at least one of the amount of pulling of the thread tensioner lever and the friction of the upper thread between the pair of thread guides provided in the at least one thread guide adjusting portion according to the result of the judgment.

Description

Technical Field

[0001] This invention relates to a thread tension adjusting device for an embroidery machine. More specifically, for various types of thread, the tension of the thread can be adjusted more easily and precisely according to the thread supply speed and thread consumption to prevent thread breakage, facilitate thread supply, and improve embroidery quality. Background Technology

[0002] Generally speaking, an embroidery machine refers to a mechanical device that, while the needle bar moves up and down, moves the embroidery frame, which holds the fabric in place, in the X and Y axes, simultaneously performing embroidery according to the user's needs. Such an embroidery machine consists of one head arm equipped with a needle bar, a thread take-up mechanism, etc.; a rotating hook base mounted on each head arm and equipped with a kiln, etc.; an embroidery frame; and an XY transmission system for driving the embroidery frame. Each head arm can have at least one needle bar corresponding to the desired color of thread.

[0003] In addition, in order to improve the product quality of embroidery machines, it is necessary to apply appropriate tension to the thread supplied to the needle after it is drawn from the spool. Therefore, a thread tension adjustment device is provided.

[0004] For example, Korean Utility Model Registration No. 20-0298706 (Multi-head Automatic Embroidery Machine with Lead Spring) (published on December 27, 2002) and Korean Patent Publication No. 10-2013-0052488 (Thread Tension Adjuster and Thread Tension Adjusting Device for Embroidery Machine Including the Adjuster) (published on May 22, 2013) disclose the structure of existing thread tension adjusting devices.

[0005] Figure 1 This is an example diagram showing an existing thread tension adjustment device on an embroidery machine.

[0006] Figure 1 The document shows Korean Utility Model Registration No. 20-0298706. Figure 5 The existing line tension adjustment device is illustrated in the figure. Further, as shown in the figure... Figure 1 As shown in the diagram, the existing wire tension adjustment device consists of a main tension adjustment device and an auxiliary tension adjustment device mounted on the wire tension adjustment plate on the head arm. The main and auxiliary tension adjustment devices are positioned appropriately along the moving path of the upper wire. In this state, the main tension adjustment device adjusts the tension of the upper wire via a take-up lever spring, while the auxiliary tension adjustment device adjusts the tension of the upper wire via a pair of lead wire sections.

[0007] However, in existing wire tension adjustment devices, the operator manually adjusts the tension of the upper wire applied to the spring of the take-up machine or the tension of the upper wire passing between a pair of lead wires (i.e., the friction caused by spring pressure) by adjusting knobs, etc. The problem is that the upper wire tension control operation is not only cumbersome, but also the upper wire tension adjustment is not constant depending on the operator's skill level, so the accuracy is not high.

[0008] To address these issues, a structure for a line tension regulating device that utilizes various actuators to adjust the upper line tension has been introduced.

[0009] For example, Korean Patent Publication No. 10-2013-0077214 (Automatic Thread Tension Adjustment Device) (published on July 9, 2013) and Korean Patent Publication No. 10-2013-0037567 (Thread Tension Adjustment Device for Sewing Machine) (published on June 16, 2013) disclose structures that adjust the pressure between the lead thread pressing plates 306 by driving the solenoid tube, thereby forming the take-up spring as one piece and adjusting the tension applied to the upper thread.

[0010] However, the tension adjustment device described in the prior art document only adjusts the tension of the upper wire passing between a pair of lead wires (i.e., the pressure applied to the lead wires) by driving an actuator such as a solenoid valve. The take-up spring only relies on its own elasticity and does not adjust the tension of the upper wire according to the supply speed and consumption of the upper wire. Therefore, there is a problem that the tension cannot be adjusted accurately.

[0011] Therefore, there is a need for a thread tension adjustment device for embroidery machines that can more conveniently and precisely adjust the tension of various threads based on the supply speed and consumption of the threads, in order to prevent thread breakage, ensure smooth thread supply, and improve embroidery quality. Summary of the Invention

[0012] Technical issues

[0013] To address the aforementioned problems, this invention provides a thread tension adjustment device for an embroidery machine. The device comprises a thread tension adjustment section that adjusts the amount of thread pulling via an actuator, and a thread guide adjustment section that applies pressure to a pair of thread guide sections via an actuator. The drive of the thread tension adjustment section and the thread guide adjustment section is automatically controlled according to the driving status of the needle bar, thread take-up machine, kiln, and embroidery frame. This allows for easier and more precise adjustment of the thread tension for various types of threads based on the thread supply speed and thread consumption, thereby preventing thread breakage, ensuring smooth thread supply, and improving embroidery quality.

[0014] The technical problems of this invention are not limited to those described above. Those skilled in the art can fully understand other technical problems not mentioned from the following description.

[0015] Technical solution

[0016] To address the aforementioned problem, an embodiment of the present invention provides a thread tension adjusting device for an embroidery machine. This device is installed on an embroidery machine comprising a needle bar, a thread take-up mechanism, a kiln, and an embroidery frame. It adjusts the tension of the thread drawn from a spool and supplied to the needle via the thread take-up mechanism. Preferably, it includes: a thread tension adjusting unit comprising: a thread take-up mechanism lever arranged along the movement path of the thread drawn from the axis and supplied to the needle, which, when rotated in contact with the thread, controls the amount of thread pull; and a first actuator providing rotational driving force to the thread take-up mechanism lever; and at least one thread guide adjusting unit comprising: a thread guide lever arranged along the movement path of the thread on the needle... At least one of the front and rear ends of the thread adjustment unit; a pair of thread guides that control the friction of the upper thread when the upper thread passes through and is in contact with the upper thread; a second actuator that provides driving force to the pair of thread guides; and a control unit that, based on each of the multiple thread step information contained in the embroidery data, determines the driving state of at least one of the needle bar, thread take-up machine, kiln, and embroidery frame, and controls the first actuator and at least one of the second actuators of each of the at least one thread adjustment unit to drive, thereby controlling at least one of the pulling amount of the thread take-up machine bar and the upper thread friction supplied to the pair of thread guides of each of the at least one thread adjustment unit.

[0017] Preferably, the control unit sets the initial angle position of the take-up lever for each of the plurality of thread step information, and then controls the drive of the first actuator so that the take-up lever maintains the initial angle position during one cycle of the needle bar reciprocating drive.

[0018] Preferably, the at least one lead wire adjustment unit includes: a first lead wire adjustment unit arranged at the front end of the pull wire adjustment unit along the movement path of the upper wire, guiding the lead wire to be drawn out from the spool and supplied to the upper wire of the pull wire adjustment unit; and a second lead wire adjustment unit arranged at the rear end of the pull wire adjustment unit along the movement path of the upper wire, guiding the lead wire to be supplied from the pull wire adjustment unit to the upper wire of the take-up machine.

[0019] Preferably, the control unit, for each of the plurality of thread step information, within one cycle of the needle bar reciprocating drive, when the thread take-up machine moves from the bottom dead center to the top dead center in a first interval, can control the driving of the second actuators of the first lead guide adjustment unit and the second lead guide adjustment unit respectively, such that the frictional force between the pair of lead parts of the first lead guide adjustment unit is greater than the frictional force between the pair of lead parts of the second lead guide adjustment unit; within one cycle of the needle bar reciprocating drive in a second interval excluding the first interval, can control the driving of the second actuators of the first lead guide adjustment unit and the second lead guide adjustment unit respectively, such that the frictional force between the pair of lead parts of the second lead guide adjustment unit is greater than the frictional force between the pair of lead parts of the first lead guide adjustment unit.

[0020] Preferably, the first actuator is a drive motor equipped with a position detection device, and the second actuator is either a solenoid or a solenoid valve.

[0021] The details of other embodiments are included in the detailed description and accompanying drawings.

[0022] Beneficial effects

[0023] According to an embodiment of the present invention, a thread tension adjusting device for an embroidery machine has the advantage of comprising a thread tension adjusting section that adjusts the amount of thread pulling by an actuator and a thread guide adjusting section that provides pressure to a pair of thread guide sections by an actuator. The drive of the thread tension adjusting section and the thread guide adjusting section is automatically controlled according to the drive status of the needle bar, the thread take-up machine, the kiln, and the embroidery frame. Therefore, for various types of threads, the tension of the threads can be more easily and accurately adjusted according to the thread supply speed and the amount of thread consumed. Thus, thread breakage can be prevented, thread supply can be made smooth, and embroidery quality can be improved.

[0024] The beneficial effects of the present invention are not limited to those described above. Those skilled in the art can fully understand other beneficial effects not mentioned from the content of the claims. Attached Figure Description

[0025] Figure 1 This is an example diagram showing an existing thread tension adjustment device installed on an embroidery machine;

[0026] Figure 2 This is a side view of an embroidery machine structure to which the thread tension adjusting device for an embroidery machine according to an embodiment of the present invention is applied;

[0027] Figure 3 This is a perspective view showing the structure of a thread tension adjusting device for an embroidery machine according to an embodiment of the present invention;

[0028] Figure 4This is a schematic diagram showing the structure of a thread tension adjusting device for an embroidery machine according to an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram showing the displacement curves of the needle bar and the thread take-up machine within one cycle of the reciprocating drive of the needle bar that makes up the embroidery machine, based on the rotation angle of the drive shaft of the driving needle bar.

[0030] Figure 6 This is a schematic diagram showing the state of the thread tension adjustment unit controlled by the control unit of a thread tension adjustment device for an embroidery machine according to an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram showing the state of the thread tension adjusting unit controlled by the control unit of a thread tension adjusting device for an embroidery machine according to an embodiment of the present invention. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can readily implement the present invention.

[0033] In describing the embodiments, descriptions of technical content that is known and familiar in the technical field to which this invention pertains and is not directly related to this invention are omitted. By omitting unnecessary descriptions, the essence of the invention can be more clearly expressed without confusion.

[0034] For the same reason, some components are exaggerated, omitted, or shown in a simplified manner in the accompanying drawings. Furthermore, the sizes of the components do not perfectly reflect their actual sizes. The same reference numerals are assigned to the same or corresponding components in all the drawings.

[0035] Furthermore, the expressions and terms used in this invention regarding the orientation of devices or elements (e.g., "front", "back", "up", "down", "top", "bottom", "left", "right", "lateral") are used only for the purpose of simply and concisely describing the invention and do not simply indicate or imply that the relevant devices or elements should have a specific orientation.

[0036] The following description, in conjunction with the accompanying drawings, describes an embodiment of the thread tension adjustment device for an embroidery machine.

[0037] Figure 2 This is a side view of an embroidery machine structure in which a thread tension adjusting device for an embroidery machine according to an embodiment of the present invention is used. Figure 3 This is a perspective view showing the structure of a thread tension adjusting device for an embroidery machine according to an embodiment of the present invention. Figure 4This is a schematic diagram showing the structure of a thread tension adjustment device for an embroidery machine according to an embodiment of the present invention.

[0038] like Figure 2 As shown, an embodiment of the present invention provides a thread tension adjusting device (1) for an embroidery machine, which is installed on an embroidery machine (10) comprising a needle bar (not shown), a thread take-up machine (not shown), a kiln (not shown), and an embroidery frame (not shown). This device can adjust the tension of the thread T drawn from the spool and supplied to the needle bar via the thread take-up machine. This thread tension adjusting device 1 for an embroidery machine can be installed inside a thread tension adjusting plate 13 located at the upper end of the needle bar sleeve 12 on the front of the machine head arm 11.

[0039] like Figure 3 and Figure 4 As shown, a thread tension adjusting device 1 for an embroidery machine according to an embodiment of the present invention may include a thread pulling adjusting part 100, at least one lead thread adjusting part 200, 300 and a control part 400. Figure 4 A is a front view showing the structure of the thread tension adjustment device 1 used in an embroidery machine. Figure 4 b is a side view showing the structure of the thread tension adjustment device 1 used in the embroidery machine.

[0040] The thread adjustment unit 100 is arranged on the moving path of the thread T that is drawn from the spool and supplied to the needle, and may include a take-up lever 110 and a first actuator 120.

[0041] When the thread take-up lever 110 rotates in a state perpendicular to the movement path of the upper thread T and in contact with the upper thread T, the amount of pulling of the upper thread T is controlled. The first actuator 120 can provide rotational driving force to the thread take-up lever 110. Preferably, the first actuator 120 can be a drive motor. In this state, when the first actuator 120 is a drive motor, a position detection device for detecting the position (rotation angle) of the thread take-up lever 110 can be provided on the drive motor.

[0042] The lead wire adjustment parts 200 and 300 can be arranged at least at one of the front and rear ends of the pull wire adjustment part 100 along the moving path of the upper wire T, and can be composed of a pair of lead wire parts 210 and 310 and a second actuator 220 and 320.

[0043] A pair of lead portions 210 and 310 pass through a space separated from each other and are in close contact with the upper wire T, controlling the frictional force of the upper wire T. Second actuators 220 and 320 can provide driving force to the pair of lead portions 210 and 310. Preferably, the second actuators 220 and 320 can be linear actuators such as solenoids or magnetic valves.

[0044] Preferably, such as Figure 3 and Figure 4 As shown, lead wire adjustment parts 200 and 300 are provided at the front end and rear end of the lead wire adjustment part 100, respectively, along the moving path of the upper lead wire T, with the lead wire adjustment part 100 as the reference.

[0045] Furthermore, such as Figure 4 As shown, the lead wire adjustment parts 200 and 300 can be arranged at the front end of the pull wire adjustment part 100 along the moving path of the upper wire T. Figure 4 In the example, the first lead wire adjustment part 200 at the upper end of the draw wire adjustment part 100 and the lead wire adjustment part 200 are arranged at the rear end of the draw wire adjustment part 100 along the moving path of the upper wire T. Figure 4 In the example, the lower end of the draw wire adjustment section 100 is composed of a second lead wire adjustment section 300.

[0046] The first lead wire adjustment section 200 guides the upper wire T, which is drawn out from the spool and supplied to the draw wire adjustment section 100, and can provide friction to the upper wire T through a pair of lead wire sections 210. The second lead wire adjustment section 300 guides the upper wire T, which is supplied from the draw wire adjustment section 100 to the take-up machine, and can provide friction to the upper wire T through a pair of lead wire sections 310.

[0047] like Figure 3 and Figure 4 As shown, the first lead wire adjustment unit 200 and the second lead wire adjustment unit 300 are actually implemented with the same structure, but they can be independently controlled by the control unit 400 according to the driving state of the needle bar, the thread take-up machine, the kiln, and the embroidery frame. The method by which the control unit controls the first lead wire adjustment unit 200 and the second lead wire adjustment unit 300 is to use a reference... Figure 7 To be described later.

[0048] like Figure 3 As shown, the control unit 400 is connected to the needle bar drive unit (not shown), the thread take-up machine drive unit (not shown), the kiln drive unit (not shown), the embroidery frame drive unit (not shown), the thread pulling adjustment unit 100, and at least one thread guide adjustment unit 200, 300. It obtains drive information from the needle bar drive unit, the thread take-up machine drive unit, the kiln drive unit, and the embroidery frame drive unit, and controls the thread pulling adjustment unit 100 and at least one thread guide adjustment unit 200, 300.

[0049] Furthermore, the control unit 400 determines the driving state of at least one of the needle bar, thread take-up machine, kiln and embroidery frame based on each of the multiple thread step information contained in the embroidery data, and then controls the driving of at least one of the first actuator 120 and at least one of the second actuators 220 and 320 respectively provided on the at least one thread adjustment unit 200 and 300 according to the determination result.

[0050] Here, embroidery data refers to data such as the type of thread, the starting position of the thread step, the thread step shape (straight line, zigzag, cross-shaped, etc.), the length / width / direction of the thread step, the color of the thread, the end position of the work, the rotation angle of the drive shaft, and the X and Y axis movement distances that are preset and stored. The drive state of the needle bar, etc., refers to the position of the needle bar, etc., according to the rotation angle of the drive shaft, and the position of the needle bar, etc., according to the rotation speed of the drive shaft.

[0051] Therefore, the control unit 400 adjusts the rotation angle of the take-up lever 110 provided in the take-up lever adjustment unit 100 and the pressure between the pair of lead wire adjustment parts 210 and 310 provided on each of the at least one lead wire adjustment unit 200 and 300, thereby adjusting at least one of the following: the amount of wire pulled by the take-up lever 110 and 310 and the upper wire friction force supplied to the pair of lead wire parts 210 and 310 provided on each of the at least one lead wire adjustment unit 200 and 3100.

[0052] Preferably, the control unit 400 can control the drive of the first actuator 120 so that the take-up lever 110 maintains its initial angular position within one cycle of the needle bar's reciprocating drive. Furthermore, the control unit 400 controls the drive of the first actuator 120 when the take-up lever 110 rotates to attempt to leave its initial angular position based on the supply status of the thread T caused by the movement of the needle bar and the take-up lever, so that the take-up lever 110 returns to its initial angular position.

[0053] Figure 5 It is a schematic diagram showing the displacement curves of the needle bar and the thread take-up machine within one cycle of the reciprocating drive of the needle bar in an embroidery machine, based on the rotation angle of the drive shaft that drives the needle bar. Figure 6 This is a schematic diagram showing the state of the thread tension adjustment unit controlled by the control unit of a thread tension adjustment device for an embroidery machine according to an embodiment of the present invention;

[0054] Figure 6 'a' is in the display Figure 5 The first section (I) of the diagram shows the state of the take-up lever 110, which is moved by the needle bar and the take-up lever. Figure 6 b is displayed Figure 5 The second section II of the diagram shows the state of the take-up lever 110, which is moved by the needle bar and the take-up lever.

[0055] like Figure 5 As shown, the first interval I and the second interval II are the top dead center of the thread-picking machine ( Figure 5 In the example, the drive shaft rotates at an angle of 68 degrees and the bottom dead center ( Figure 5 In the example, the drive shaft rotation angle (292 degrees) is set as the baseline.

[0056] Preferably, the first interval I can be set as one cycle of the needle bar reciprocating drive, that is, the interval in which the thread take-up machine moves from the bottom dead center to the top dead center within the 360-degree rotation range of the drive shaft driving the needle bar. Therefore, in Figure 5 In the example, the first interval I represents the rotation angle of the drive shaft from 0 degrees to 68 degrees and from 292 degrees to 360 degrees (0 degrees), and the second interval II represents the rotation angle of the drive shaft from 68 degrees to 292 degrees.

[0057] In addition, the control unit 400 uses each of the multiple thread step information contained in the embroidery data to set the initial angle position A of the thread take-up lever 110 for each of the multiple thread step information, and then controls the drive of the first actuator 120 so that the thread take-up lever 110 maintains the initial angle position A within one cycle of the needle bar reciprocating drive.

[0058] First, such as Figure 6 As shown in Figure a, when the thread take-up lever 110 is in the first section I, it moves downwards along the upper thread T pulled by the thread take-up lever ( Figure 6 When the lever 110 rotates clockwise to leave the initial angle position A (position B), the control unit 400 can control the drive of the first actuator 120 to make the lever 110 rotate counterclockwise and return to the initial angle position A.

[0059] On the contrary, such as Figure 6 As shown in b, when the thread take-up lever 110 passes through the upper thread T supplied to the thread take-up machine in the second section I, it moves upwards ( Figure 6 When the lever 110 rotates counterclockwise to leave the initial angle position A (position C), the control unit 400 can control the drive of the first actuator 120 to make the lever 110 rotate clockwise and return to the initial angle position A.

[0060] Therefore, the advantage of the thread tension control device 1 for an embroidery machine according to an embodiment of the present invention is that even if the thread breaks during the embroidery operation, the tension of the upper thread T can be adjusted more precisely because the thread take-up lever 110 can maintain the initial angle position A, and damage to the thread take-up lever 110 and the like can also be prevented.

[0061] In addition, Figure 5 The illustration shows an example where the top dead center of the thread take-up machine is 68 degrees of drive shaft rotation angle and the bottom dead center is 292 degrees of drive shaft rotation angle. However, it is not limited to this; the top and bottom dead centers of the thread take-up machine can be changed according to the driving conditions of the embroidery machine 10. Furthermore, for ease of explanation, Figure 6 Figures a and b illustrate an example where the initial angular position A of the take-up lever 110 is horizontal, but this is not the only example.

[0062] In one embodiment of the present invention, the control unit 400 of the thread tension adjustment device 1 for an embroidery machine can adjust the frictional force of the upper thread T supplied to the pair of lead thread portions 210, 310 provided in each of at least one lead thread adjustment unit 200, 300 according to the supply state of the upper thread T that occurs as the needle bar and the take-up machine move.

[0063] Figure 7 This is a schematic diagram showing the state of the thread tension adjusting unit controlled by the control unit of a thread tension adjusting device for an embroidery machine according to an embodiment of the present invention.

[0064] Figure 7 As shown in a, in Figure 5 In the first section (I) of the diagram, as the needle bar and thread take-up device move, the friction between a pair of thread take-up parts 210 and 310 located in each thread take-up adjustment part 200 and 300 is adjusted. Figure 7 As shown in b, in Figure 5 In the second section II of the diagram, as the needle bar and the thread take-up machine move, the friction between a pair of thread take-up parts 210 and 310 in each of the thread take-up adjustment parts 200 and 300 is adjusted.

[0065] First, such as Figure 7 As shown in a, when the thread take-up machine moves from the bottom dead point to the top dead point in the first interval I, the control unit 400 can control the driving of the second actuators 220 and 320 respectively provided in the first lead wire adjustment unit 200 and the second lead wire adjustment unit 300, so that the frictional force F1 between the pair of lead wire adjustment units 210 provided in the first lead wire adjustment unit 300 is greater than the frictional force F2 between the pair of lead wire adjustment units 310 provided in the second lead wire adjustment unit 300.

[0066] Preferably, in order to eliminate frictional force F2 between the pair of lead portions 310 of the second lead adjustment section 300, and further, in order to completely separate the pair of lead portions 310, the drive of the second actuator 320 provided in the second lead adjustment section 300 can be controlled.

[0067] On the contrary, such as Figure 7 As shown in b, when the thread take-up machine moves from the upper dead point to the lower dead point in the second section II, the control unit 400 can control the driving of the second actuators (220, 320) provided by the first lead adjustment unit 200 and the second lead adjustment unit 300 respectively, so that the frictional force F2 between the pair of lead adjustment parts 310 provided by the second lead adjustment unit 300 is greater than the frictional force F1 between the pair of lead parts 210 provided by the first lead adjustment unit 200.

[0068] Preferably, in order to eliminate frictional force F1 between the pair of lead portions 210 of the first lead adjustment section 200, and further, in order to completely separate the pair of lead portions 210, the drive of the second actuator 220 provided in the first lead adjustment section 300 can be controlled.

[0069] like Figure 6 and Figure 7 As shown, in one embodiment of the present invention, the thread tension adjusting device 1 for an embroidery machine is arranged in the moving path of the upper thread T. While adjusting the pulling amount of the upper thread T, it also adjusts the frictional force of the upper thread T passing between a pair of lead thread portions 210 and 310, thereby adjusting the tension of the upper thread T supplied to the needle by the spool T.

[0070] As described above, the tension adjusting device 1 for an embroidery machine according to an embodiment of the present invention includes a thread adjusting section 100 that adjusts the pulling amount of the upper thread T by an actuator, and thread adjusting sections 200 and 300 that provide pressure to a pair of thread guides 210 and 310 by an actuator. The driving of the thread adjusting section 100 and the thread adjusting sections 200 and 300 is automatically controlled according to the driving state of the needle bar, the thread take-up machine, the kiln, and the embroidery frame. Therefore, for various types of thread T, the tension of the upper thread T can be more easily and accurately adjusted according to the supply speed and consumption of the upper thread T. Thus, not only can the upper thread T be prevented from breaking and the supply of the upper thread T be made smooth, but the quality of the embroidery can also be improved.

[0071] In this invention, the thread tension adjustment device of an embroidering machine is used as an example for illustration, but the scope of application of this invention is not limited thereto. This invention can be applied to various machines and equipment that require thread tension adjustment devices, such as ordinary sewing machines.

[0072] Preferred embodiments of the present invention are disclosed in this specification and figures. Although some specific terms are used, these are merely for the purpose of more easily illustrating the technical content of the present invention and are used in a general sense to aid in understanding the present invention, and are not intended to limit the scope of the present invention. In addition to the embodiments disclosed herein, various modifications can be implemented based on the technical concept of the present invention, and these modifications will be self-evident to those skilled in the art.

[0073] Industrial applications

[0074] This invention relates to a thread tension adjusting device for embroidery machines. More specifically, for various types of thread, the tension of the thread can be adjusted more easily and accurately according to the thread supply speed and the amount of thread consumed. This allows for easier and more precise adjustment of the thread tension, thereby preventing thread breakage and ensuring smooth thread supply. It can also be applied to the technical field of thread tension adjusting devices for embroidery machines that can improve embroidery quality.

Claims

1. A thread tension adjusting device for an embroidery machine, mounted on an embroidery machine comprising a needle bar, a thread take-up mechanism, a kiln, and an embroidery frame, for adjusting the tension of the thread drawn from a spool and supplied to the needle on the needle bar via the thread take-up mechanism; characterized in that, include: A thread adjustment unit includes: a thread take-up lever arranged on a moving path of an upper thread that is drawn out from an axis and supplied to a needle, a thread take-up lever that controls the amount of upper thread pull when rotating in a state of contact with the upper thread, and a first actuator that provides a rotational driving force to the thread take-up lever; At least one lead wire adjustment unit includes: at least one of the front end and rear end of the lead wire adjustment unit arranged along the movement path of the upper wire, and a pair of lead wire portions controlling the friction force of the upper wire when the upper wire passes through and is in contact with the upper wire; and a second actuator providing driving force to the pair of lead wire portions. The control unit determines the driving state of at least one of the needle bar, thread take-up machine, kiln, and embroidery frame based on each of the multiple thread step information contained in the embroidery data. Based on the determination result, it controls at least one of the second actuators of the first actuator and the at least one thread guide adjustment unit, thereby controlling at least one of the pulling amount of the thread take-up machine bar and the upper thread friction force supplied to the pair of thread guides of the at least one thread guide adjustment unit.

2. The thread tension adjusting device for an embroidery machine according to claim 1, characterized in that, The control unit sets the initial angle position of the take-up lever for each of the plurality of thread step information, and then controls the drive of the first actuator so that the take-up lever maintains the initial angle position during one cycle of the needle bar reciprocating drive.

3. The thread tension adjusting device for an embroidery machine according to claim 2, characterized in that, The at least one lead wire adjustment unit includes: a first lead wire adjustment unit, which is arranged at the front end of the pull wire adjustment unit along the movement path of the upper wire, and guides the lead wire to be supplied to the upper wire of the pull wire adjustment unit after being drawn out from the spool; and a second lead wire adjustment unit, which is arranged at the rear end of the pull wire adjustment unit along the movement path of the upper wire, and guides the lead wire to be supplied to the upper wire of the take-up machine from the pull wire adjustment unit.

4. The thread tension adjusting device for an embroidery machine according to claim 3, characterized in that, The control unit controls the driving of the second actuators of the first lead wire adjustment unit and the second lead wire adjustment unit respectively, for each of the plurality of thread step information, in the first interval from the bottom dead point to the top dead point during one cycle of the needle bar reciprocating drive, so that the friction between the pair of lead wires of the first lead wire adjustment unit is greater than the friction between the pair of lead wires of the second lead wire adjustment unit. Within one cycle of the needle bar reciprocating drive, in the second interval excluding the first interval, the drive of the second actuators of the first lead adjustment section and the second lead adjustment section is controlled, so that... The frictional force between the pair of leads in the second lead adjustment section is greater than the frictional force between the pair of leads in the first lead adjustment section.

5. The thread tension adjusting device for an embroidery machine according to claim 1, characterized in that, The first actuator is a drive motor equipped with a positioning device, and the second actuator is either a solenoid or a solenoid valve.

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