JP2009061089A - Bobbin thread tension adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily adjust the tension of a bobbin thread without necessity to take out a bobbin case from a rotating hook bobbin case holder after stopping the driving of a sewing machine when adjusting the tension of the bobbin thread during sewing. <P>SOLUTION: The bobbin thread tension adjusting device includes: a permanent magnet 12 arranged in a rotating hook 8; a coil 13 arranged on a surface opposing to the permanent magnet 12 in the rotating hook bobbin case holder 7; a rotating hook bobbin case holder electrode 15 arranged inside the rotating hook bobbin case holder so as to receive power generated between the permanent magnet 12 and the coil 13 by the rotation of the rotating hook 8 with respect to the rotating hook bobbin case holder 7; a first case electrode 16 arranged in the bobbin case 6 so as to receive the power supplied from the rotating hook bobbin case holder electrode 15; a photo-sensor 22 arranged in the bobbin case 6 so as to receive a control signal by non-contact; a light emitting diode 27 for transmitting the control signal to the photo-sensor 22; and a pulse motor 20 for adjusting the tension to bobbin thread 3 by a bobbin thread adjusting spring 11 through the use of the power supplied from the first case electrode 16 in response to the control signal received by the photo-sensor 22 from the light emitting diode 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lower thread tension adjusting device that adjusts tension applied to a lower thread wound around a bobbin by a tension applying member provided on a bobbin case.

  2. Description of the Related Art Conventionally, when a seam is formed on a fabric, a sewing machine using a hook device that crosses a lower thread with an upper thread loop formed by an upper thread inserted through a sewing needle is used.

  The hook device includes a bobbin case that holds a bobbin around which a lower thread is wound, an inner hook that holds the bobbin case inside, and an outer hook that holds the inner hook inside. The outer hook is connected to the hook shaft that is driven in synchronization with the sewing machine main shaft, and is rotatable relative to the inner hook. The outer thread loop is captured by the sword tip formed on the peripheral edge and rotated relative to the inner hook. By doing so, the inner hook is passed through the upper thread loop. As a result, the shuttle device crosses the upper thread loop with the lower thread that is fed out of the bobbin case and supplied to the needle drop position through the needle hole of the needle plate.

  In such a shuttle device, from the viewpoint of smoothly supplying the lower thread and preventing the formation of rough seams, the lower thread is fed out of the bobbin case on the outer peripheral surface of the bobbin case. A bobbin thread tension adjusting spring as a tension applying member that applies tension to the bobbin thread is disposed in the vicinity of the outlet. This lower thread tension adjusting spring is fixed to the peripheral wall of the bobbin case with a fixing screw. By pressing the lower thread fed from the feeding port by the urging force of the lower thread tension adjusting spring, a predetermined tension is applied to the lower thread. (For example, refer to Patent Document 1). Further, in such a hook device, the pressing force on the lower thread of the lower thread tension adjusting spring can be adjusted by adjusting the tightening amount of the fixing screw that fixes the lower thread tension adjusting spring to the bobbin case. Thus, the tension of the lower thread can be adjusted.

JP 2005-160942 A

  However, in order to adjust the tension of the lower thread in such a hook device, the bobbin case is taken out from the inner hook, and the tightening of the fixing screw for fixing the lower thread tension adjusting spring is adjusted to adjust the lower thread to the approximate tension. The bobbin case was stored in the inner hook again, and trial sewing was performed to adjust the tension of the upper thread. As a result, in order to reset the lower thread tension, the sewing machine must be stopped, the bobbin case removed from the inner hook again, and the tightening of the fixing screw must be adjusted. There was a problem that adjustment was troublesome.

  Moreover, since the fixing screw is a small screw for fixing the lower thread tension adjusting spring to the bobbin case, it is difficult to form a scale indicating the degree of tension of the lower thread on the fixing screw.

  In particular, the inner hook in which the bobbin case is stored is stored in a floating state in the outer hook so that the upper hook loops through the inner hook. For this reason, while the sewing machine is being sewn, the bobbin case cannot be brought into contact with the lower thread tension adjusting member. Therefore, even if an actuator for adjusting the thread tension from the outside is attached to the bobbin case, The cable supplying electricity could not be connected. As a result, the tension of the lower thread could not be adjusted during sewing of the sewing machine.

  The present invention has been made in view of these points, and when adjusting the tension of the lower thread, it is not necessary to stop the driving of the sewing machine and take out the bobbin case from the inner hook, and easily adjust the tension of the lower thread. It is an object of the present invention to provide a lower thread tension adjusting device that can be used.

  In order to achieve the object, the bobbin thread tension adjusting device according to the first aspect of the present invention is characterized in that a bobbin case that holds a bobbin around which a bobbin thread is wound, and the bobbin case provided in the bobbin case. A tension applying member that applies tension to the lower thread that is fed out of the inner thread, an inner hook that holds the bobbin case inside, and a sword tip that holds the inner hook inside and rotates relative to the inner hook. In a lower thread tension adjusting device provided in a hook device of a sewing machine having an outer hook that passes the inner hook through a captured upper thread loop, the lower thread tension adjusting device is provided on a surface of the outer hook facing the inner hook. A magnet, a coil provided on a surface of the inner hook facing the magnet, and a surface in contact with the bobbin case inside the inner hook; and by rotation of the outer hook relative to the inner hook. An inner hook electrode that receives electric power generated between the magnet and the coil, a case electrode that is provided on the bobbin case and that receives electric power supplied from the inner hook electrode, is provided on the bobbin case, and is contactless. A receiving element that receives a control signal, a transmitting element that is disposed apart from the hook device and that transmits a control signal to the receiving element, a control unit that controls the transmitting element, and the case electrode And a tension adjusting member that adjusts the tension applied to the lower thread by the tension applying member by electric power supplied from the case electrode in accordance with a control signal received by the receiving element from the transmitting element. .

  According to the first aspect of the present invention, when the outer hook rotates, the electric power generated between the magnet arranged in the outer hook and the coil arranged in the inner hook is formed in the bobbin case. It can supply to the tension adjustment member for adjusting the tension | tensile_strength to the lower thread | yarn by the tension | tensile_strength provision member made. For this reason, even during sewing, it is possible to drive the tension adjusting member by supplying electric power to the tension adjusting member of the bobbin case held inside the inner hook that is kept floating from the outer hook.

  The bobbin thread tension adjusting device according to the invention of claim 2 is characterized in that, in the bobbin thread tension adjusting device of claim 1, the case electrode is a first case electrode and is provided on an outer surface of the bobbin case. The second case electrode connected to the tension adjusting member contacts the second case electrode when the outer hook is stopped or the sewing machine is turned on, and power is supplied to the tension adjusting member via the second case electrode. An external electrode to be supplied, and the external electrode is moved to a position away from the hook device after power is supplied to the tension adjusting member.

  According to the second aspect of the present invention, when the sewing machine is stopped or when the sewing machine is turned on, if the outer hook is not rotating and power cannot be generated between the magnet and the coil, the external electrode is connected to the second case. By making contact with, power can be supplied from the external electrode to the tension adjusting member via the second case electrode, and the tension adjusting member can be driven by this power to adjust the tension of the lower thread. Therefore, even when the sewing machine is stopped or when the sewing machine is turned on, the bobbin case can be easily adjusted without removing the bobbin case from the inner hook.

  The lower thread tension adjusting device according to claim 3 is characterized in that, in the lower thread tension adjusting device according to claim 2, the transmitting element and the external electrode are controlled by the receiving element from the transmitting element. It moves integrally between a receivable position where signals can be received, a contactable position where the external electrode contacts the second case electrode, and a detachable position where the bobbin case can be detached from the inner hook. It is in the point which was possible.

  According to the third aspect of the present invention, the transmitting element and the external electrode have a receivable position where the receiving element can receive a control signal from the transmitting element, a contactable position where the external electrode contacts the second case electrode, In addition, the bobbin case can be appropriately moved integrally to three places where the bobbin case can be detached from the inner hook. Thereby, the tension of the lower thread can be reliably adjusted without impairing the workability of attaching and detaching the bobbin case, and power can be reliably supplied to the tension adjusting member when the outer hook is not rotating.

  The bobbin thread tension adjusting device according to a fourth aspect of the present invention is characterized in that the bobbin case holding the bobbin around which the bobbin thread is wound is provided inside the bobbin case, and is fed out of the bobbin case A tension applying member that applies tension to the lower thread, an inner hook that holds the bobbin case inside, and an upper part that is captured by the sword tip by holding the inner hook inside and rotating with respect to the inner hook. In a lower thread tension adjusting device provided in a hook device of a sewing machine having an outer hook that passes the inner hook through a thread loop, a rechargeable battery provided in the inner hook and rechargeable when the outer hook stops rotating; An inner hook electrode provided on a surface in contact with the bobbin case inside the inner hook and receiving electric power supplied from the rechargeable battery, and an electric power provided from the inner hook electrode provided on the bobbin case. A case electrode, a receiving element provided in the bobbin case for receiving a control signal in a non-contact manner, the transmitting element disposed apart from the hook device and transmitting a control signal to the receiving element, A control unit for controlling the transmitting element, and connected to the case electrode, and according to a control signal received by the receiving element from the transmitting element, to the lower thread by the tension applying member by electric power supplied from the case electrode And a tension adjusting member that adjusts the tension.

  According to the fourth aspect of the present invention, the electric power charged in the rechargeable battery when the sewing machine is stopped is supplied to the tension adjusting member for adjusting the tension to the lower thread by the tension applying member formed on the bobbin case. can do. For this reason, even during sewing, it is possible to drive the tension adjusting member by supplying electric power to the tension adjusting member of the bobbin case held inside the inner hook that is kept floating from the outer hook.

  As described above, according to the lower thread tension adjusting device according to the present invention, power is supplied to the tension adjusting member even during sewing, and the tension adjusting member is adjusted according to the control signal transmitted from the transmitting element to the receiving element. By driving, the tension of the lower thread can be easily adjusted. Therefore, when adjusting the tension of the lower thread while trying the condition of the tension of the upper thread, the tension of the lower thread can be easily adjusted without removing the bobbin case from the inner hook. The trouble of adjusting the tension of the thread can be saved. In addition, it is possible to adjust the tension of the upper thread and adjust the tension of the lower thread according to changes in the sewing pitch, fabric thickness, sewing texture, etc. during sewing. The sewing quality can be improved and the working efficiency of the sewing machine can be improved.

  Hereinafter, an embodiment of a lower thread tension adjusting device according to the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded perspective view showing a hook device in the lower thread tension adjusting device according to the present embodiment. As shown in FIG. 1, the lower device 3 in the lower thread tension adjusting device 1 has a lower thread 3 wound around it. A bobbin case 6 that holds the bobbin 5 inside, an inner hook 7 that holds the bobbin case 6 inside, and an outer hook 8 that holds the inner hook 7 inside.

  The outer hook 8 is formed in a substantially cylindrical shape with one surface opened. A hook shaft 10 that rotates in synchronization with a sewing machine main shaft (not shown) is connected to the outer surface of the bottom wall 8 a of the outer hook 8. The outer hook 8 rotates in synchronism with the driving of a needle bar (not shown) which is attached to the sewing machine main shaft and moves up and down by rotating the hook shaft 10. Yes. A sword tip 8b is formed at the opening edge of the outer hook 8 to capture the upper thread loop formed by the upper thread inserted through the needle hole of the sewing needle. Further, as shown in FIG. 2, a plurality of permanent magnets 12 are arranged on the inner surface of the bottom wall 8a of the outer hook 8 with a predetermined gap in the circumferential direction.

  The inner hook 7 is formed in a substantially cylindrical shape with one surface opened, and is disposed in the outer hook 8 so that the bottom wall 7 a of the inner hook 7 faces the bottom wall 8 a of the outer hook 8. It is held so as not to rotate in a state of floating from 8. The outer hook 8 rotates relative to the inner hook 7 so that the upper thread loop captured by the sword tip 8 b passes through the inner hook 7.

  As shown in FIG. 3, a coil 13 is disposed on the outer surface of the bottom wall 7a of the inner hook 7, that is, on a position facing the permanent magnet 12 disposed on the outer hook 8, and the coil 13 is shown in FIG. (A) A full wave clear stream and parallel connection may be used as shown in (b), and a full wave clear stream and serial connection may be used as shown in FIGS. As shown in FIG. 6, an inner hook electrode 15 is disposed on the inner surface of the bottom wall 7 a of the inner hook 7, and the inner hook electrode 15 has a plurality of openings formed in the bottom wall 7 a of the inner hook 7. It is electrically connected to the coil 13 via The outer hook 8 and the inner hook 7 generate electricity between the permanent magnet 12 and the coil 13 as the outer hook 8 rotates relative to the inner hook 7.

  The bobbin case 6 is formed in a substantially cylindrical shape with an opening on one side, and a lower thread 3 wound around the bobbin 5 held inside is disposed outside the bobbin case 6 on a part of the outer peripheral wall 6a. A payout outlet is formed. A lower thread tension adjusting spring 11 as a tension applying member for applying tension to the lower thread 3 is disposed in the vicinity of the outlet on the outer peripheral wall 6a. The lower thread tension adjusting spring 11 is fixed to the bobbin case 6. It is fixed by screws 9. The lower thread tension adjusting spring 11 applies a predetermined tension to the lower thread 3 by pressing the lower thread 3 fed out from the outlet by the urging force of the lower thread tension adjusting spring 11. .

  The bobbin case 6 is held inside the inner hook 7 so that the opening edge thereof faces the bottom wall 7a of the inner hook 7, and as shown in FIG. A first case electrode 16 to which electric power generated by the permanent magnet 12 and the coil 13 is supplied by the inner hook electrode 15 is disposed on a portion of the outer surface that contacts the inner hook electrode 15. Further, a flexible wiring board 18 as shown in FIG. 8 is arranged inside the bobbin case 6 so as to face the top wall 6b of the bobbin case 6. The flexible wiring board 18 includes a first case electrode. 16 is electrically connected through an opening (not shown) formed in the peripheral wall 6 a of the bobbin case 6. In addition, a pulse motor 20 as a tension adjusting member having a thickness of about 2 mm is mounted on the flexible wiring board 18, and the shaft 20 a of the pulse motor 20 is connected to the peripheral wall 6 a of the bobbin case 6 as shown in FIG. 9. Is connected to a fixing screw 9 for fixing the lower thread tension adjusting spring 11 through an opening formed in The pulse motor 20 is driven by the number of pulses in accordance with a control signal from a pulse motor driving IC 21 mounted on the flexible wiring board 18 so that the pressing force on the lower thread 3 of the lower thread tension adjusting spring 11 can be adjusted. Has been.

  In addition, a pair of photosensors 22 as receiving elements and a charging capacitor 23 are mounted on the flexible wiring board 18, and the pulse motor driving IC 21 is driven by a control signal from each photosensor 22. It has become. Further, a second case electrode 25 is mounted on the flexible wiring board 18, and the second case electrode 25 is disposed so as to be exposed to the outside from the bobbin case 6.

  As shown in FIG. 10, a pair of light emitting diodes 27 as transmitting elements for transmitting control signals to the respective photosensors 22 are provided at positions facing the outer surface of the top wall 6b of the bobbin case 6 in the hook device 2. A controller unit 29 that is integrally provided with an external electrode 28 that contacts the second case electrode 25 and supplies electric power to the pulse motor 20 via the second case electrode 25 is disposed. The controller unit 29 is provided so as to be able to advance and retreat between a position away from the hook device 2 and a position close to the hook device 2 where the external electrode 28 contacts the second case electrode 25. When power is supplied to 20, it is moved to a close position, and at other times, it is moved to a separated position that does not interfere with the attachment / detachment of the bobbin case 6 to the inner hook 7.

  Although not shown, the controller unit 29 includes an arithmetic processing unit (CPU), a ROM, a RAM, and an input / output device. In particular, the ROM stores a control signal transmitted from the light emitting diode 27 as a transmitting element. Yes. This control signal has information on the number of pulses for driving the pulse motor 20. A control signal is read from the ROM and written in the RAM in accordance with the switching timing or sewing conditions input from the input / output device, and the CPU is written in the RAM in the light emitting diode 27 at a predetermined timing at the time of sewing. A control signal is output, whereby the light emitting diode 27 transmits the control signal.

  As shown in FIG. 11, the lower thread tension adjusting device 1 generates electric power generated between the permanent magnet 12 and the inner hook electrode 15 by the rotation of the outer hook 8 when the sewing machine is driven. The pulse motor 20 is supplied via the one case electrode 16. In addition, when the sewing machine is turned on or when the outer hook 8 is not rotating, power is supplied from the external electrode 28 to the pulse motor 20 via the second case electrode 25.

  Next, regarding the operation of the present embodiment, first, the operation of the lower thread tension adjusting device 1 when the sewing machine is driven will be described.

  When the sewing machine is driven, the main spindle of the sewing machine rotates at a maximum speed of about 5000 to 4000 rpm, and the shuttle shaft 10 rotates at a maximum speed of about 10,000 to 8000 rpm. At this time, as shown in FIG. 12A, the controller unit 29 is separated from the shuttle device 2, and each photo sensor 22 is located at a position where it can reliably receive a control signal from each light emitting diode 27. .

  In the lower thread tension adjusting device 1, when the outer hook 8 rotates due to the rotation of the hook shaft 10, a voltage is induced in the coil 13 and electric power is generated between the permanent magnet 12 and the coil 13. The lower thread tension adjusting device 1 supplies this electric power to the first case electrode 16 through the inner hook electrode 15, and after charging and smoothing the electric power supplied in the capacitor 23 mounted on the flexible wiring board 18. Then, it is supplied to the pulse motor driving IC 21 and further supplied to the pulse motor 20 and the photo sensor 22 via the pulse motor driving IC 21.

  In order to adjust the tension of the lower thread tension adjusting spring 11 in the lower thread tension adjusting device 1, first, for example, when an operator operates an input device such as a touch panel provided on the arm portion of the sewing machine, the lower thread tension adjusting device 1 is operated. The adjusting device 1 uses a power generated between the permanent magnet 12 and the coil 13 to transmit a control signal to the photosensor 22 by the light emitting diode 27 via the controller unit 29. Further, when the photosensor 22 receives the control signal, the lower thread tension adjusting device 1 rotates the shaft 20a of the pulse motor 20 to an angle according to the control signal, and the motor shaft that is helically threaded and the screw The pressing force against the lower thread 3 of the lower thread tension adjusting spring 11 is adjusted by the fixing screw 9 with the corresponding tap raised. Here, when a control signal is transmitted to one of the two photosensors 22, the pulse motor driving IC 21 inputs the control signal and presses the lower thread tension adjusting spring 11 against the lower thread 3. When the pulse motor 20 is driven in the direction of decreasing the pressure and a control signal is transmitted to the other photo sensor 22, the pulse motor 20 is driven in the direction of increasing the pressing force to the lower thread 3 of the lower thread tension adjusting spring 11. . Accordingly, the lower thread tension adjusting device 1 adjusts the tension of the lower thread 3 by controlling the pulse motor 20.

  Next, the operation of the lower thread tension adjusting device 1 when the sewing machine is stopped and when the power is turned on will be described.

  When the sewing machine is stopped, the controller unit 29 is located at a detachable position where the bobbin case 6 can be detached from the inner hook 7 while being separated from the hook device 2 as shown in FIG. When the sewing machine is turned on, as shown in FIG. 11 (c), the controller unit 29 is moved to a contactable position close to the shuttle device 2 so that the external electrode 28 contacts the second case electrode 25. It moves and supplies power from the external electrode 28 to the pulse motor 20 and the pulse motor driving IC 21 through the second case electrode 25.

  When the electric power from the external electrode 28 is supplied, the lower thread tension adjusting device 1 drives the pulse motor 20 by the pulse motor driving IC 21 so as to be positioned at the origin position when the sewing machine is turned on. The origin position may be an abutting position where the pulse motor 20 is locked, or may be a position where an origin sensor (not shown) is provided in the vicinity of the pulse motor 20 and the origin sensor detects an output. Thereby, the lower thread tension adjusting device 1 adjusts the tension of the lower thread 3 to a predetermined tension when the power is turned on.

  Then, after adjusting the lower thread 3 to a predetermined tension, the lower thread tension adjusting device 1 moves the controller unit 29 to the attachable / detachable position, and when the sewing machine starts driving and the outer hook 8 rotates, the receivable position Move to. Furthermore, after the driving of the sewing machine is stopped, the sewing machine is moved again to the detachable position. Here, when the tension of the lower thread 3 is adjusted after the sewing machine is stopped, the lower thread tension adjusting device 1 moves the controller unit 29 to a contactable position and passes the external electrode 28 through the second case electrode 25. Then, electric power is supplied to the pulse motor 20 and the pulse motor driving IC 21 to adjust the tension of the lower thread 3.

  According to the present embodiment, when the outer hook 8 rotates, the electric power generated between the permanent magnet 12 provided in the outer hook 8 and the coil 13 provided in the inner hook 7 is converted into the bobbin case 6. Can be supplied to a pulse motor 20, a pulse motor driving IC 21, a photo sensor 22, a capacitor 23, and the like for adjusting the pressing force against the lower thread 3 of the lower thread tension adjusting spring 11 formed in the above. For this reason, even during sewing, power is supplied to the pulse motor 20 and the pulse motor driving IC 21 of the bobbin case 6 held inside the inner hook 7 held in a floating state from the outer hook 8, The pulse motor 20 can be driven by the pulse motor drive IC 21.

  Accordingly, the bobbin thread tension adjusting device 1 supplies power to the pulse motor 20 and the pulse motor driving IC 21 even during sewing, and the photosensor 22 receives the control signal from the light emitting diode 27 to the pulse motor driving IC 21. By inputting, the tension of the lower thread 3 can be easily adjusted. For this reason, even when adjusting the tension of the lower thread 3 while trying the condition of the tension of the upper thread, the tension of the lower thread 3 can be easily adjusted without removing the bobbin case 6 from the inner hook 7. As a result, the labor of adjusting the tension of the lower thread 3 can be saved. Further, the tension of the upper thread and the tension of the lower thread 3 can be adjusted in accordance with a change in the sewing pitch, a change in the thickness of the cloth, a change in the texture of the sewing, and the like during the sewing. Therefore, the sewing quality can be improved and the working efficiency of the sewing machine can be improved.

  Further, when the sewing machine is stopped or when the sewing machine is turned on and the outer hook 8 is not rotating and power cannot be generated between the permanent magnet 12 and the coil 13, the external electrode 28 is brought into contact with the second case. As a result, electric power can be supplied from the external electrode 28 to the pulse motor 20 through the second case electrode 25, and the tension of the lower thread 3 can be adjusted by driving the pulse motor 20 with this electric power. For this reason, the lower thread 3 can be easily adjusted without taking out the bobbin case 6 from the inner hook 7 even when the sewing machine is stopped or when the sewing machine is turned on.

  Furthermore, the controller unit 29 including the light emitting diode 27 and the external electrode 28 can receive the control signal from the light emitting diode 27 by the photosensor 22, and can contact the external electrode 28 in contact with the second case electrode 25. The position and the bobbin case 6 can be appropriately moved integrally in three places, ie, a detachable position where the bobbin case 6 can be detached from the inner hook 7. As a result, the tension of the lower thread 3 can be reliably adjusted without impairing the workability of attaching and detaching the bobbin case 6, and power is reliably supplied to the pulse motor 20 and the like when the outer hook 8 is not rotating. be able to.

  In addition, this invention is not limited to the said embodiment, A various change is possible as needed.

  For example, in the present embodiment, as a sensor for controlling the pulse motor 20, the receiving element is configured by a photosensor 22 and the transmitting element is configured by an optical sensor including a light emitting diode 27. However, the present invention is not limited thereto. Instead, various sensors capable of transmitting and receiving control signals in a non-contact manner such as an infrared sensor, a sensor composed of a Hall element and an electromagnet, or a sensor using the approach and separation of the permanent magnet 12 can be used. Further, the CPU is mounted on the flexible wiring board 18 disposed in the bobbin case 6 and the state of the sewing machine power is output to the drive control means (not shown) of the sewing machine by bidirectional serial communication. When stopping, power is directly supplied to the bobbin case 6 or a strain gauge is attached to the lower thread tension adjusting spring 11 to obtain a highly accurate thread tension, and this thread tension value is output to the drive control means of the sewing machine. It may be recorded as yarn tension data corresponding to the fabric.

  Further, although the pulse motor 20 is used as a tension adjusting member for adjusting the tension of the lower thread 3, the present invention is not limited to this, and a linear motor, a linear pulse motor 20, a DC DC motor, or the like can be used. Furthermore, although both the photosensors 22 and the second case electrode 25 are exposed from the top wall 6b of the bobbin case 6, the arrangement positions of both the photosensors 22 and the second case electrode 25 are not limited to this, and the bobbin You may arrange | position so that it may expose from the surrounding wall 6a of case 6. FIG.

  Furthermore, in this embodiment, the permanent magnet 12 provided in the outer hook 8 and the coil 13 provided in the inner hook 7 generate electric power by rotating the outer hook 8, and this electric power is used to generate a pulse motor 20. However, in an industrial sewing machine in which the rotation of the outer hook 8 is intermittent, for example, electric power cannot be generated efficiently. In such a sewing machine, a rechargeable battery such as a secondary battery that can be charged when the rotation of the outer hook 8 of the sewing machine is stopped is provided in the inner hook 7, and a pulse motor is generated by electric power from the secondary battery during sewing of the sewing machine. 20 etc. may be driven.

  Furthermore, in the present embodiment, the transmitting element and the external electrode 28 are integrally provided in the controller unit 29. However, the present invention is not limited to this, and only the external electrode 28 can be moved toward and away from the second case electrode 25. The transmitting element may be fixedly disposed at a position separated from the shuttle device 2.

The disassembled perspective view which shows the shuttle apparatus provided in one Embodiment of the bobbin thread tension adjusting device which concerns on this invention The top view which shows the inside of the outer hook in the hook apparatus of FIG. The bottom view which shows the outer surface of the bottom wall of the inner hook in the hook apparatus of FIG. (A) (b) is a block diagram which shows an example of the connection of the coil of FIG. (A) and (b) are the block diagrams which show the other example of the connection of the coil of FIG. The top view which shows the inside of the inner hook in the hook apparatus of FIG. The top view which shows the outer surface of the top wall of the bobbin case in the shuttle apparatus of FIG. The top view which shows the flexible wiring board arrange | positioned inside the bobbin case of FIG. Schematic side sectional view showing a bobbin case in the hook device of FIG. The schematic front view which shows the controller unit with which one Embodiment of the bobbin thread tension adjusting device which concerns on this invention was equipped. Electrical configuration diagram of an embodiment of a lower thread tension adjusting device according to the present invention (a) is a schematic side view showing a case where the controller of FIG. 10 is located at a receivable position, (b) is a schematic side view showing a case where the controller of (a) is located at a detachable position, (c) These are the schematic side views which show the case where the controller of (a) is located in a connectable position

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower thread tension adjusting device 2 Hook device 3 Lower thread 5 Bobbin 6 Bobbin case 6a Peripheral wall 6b Top wall 7 Inner hook 7a Bottom wall 8 Outer hook 8a Bottom wall 8b Blade tip 10 Hook shaft 11 Lower thread tension adjusting spring 12 Permanent magnet 13 Coil 15 Inner hook electrode 16 First case electrode 18 Flexible wiring board 20 Pulse motor 21 Pulse motor drive IC
22 Photosensor 23 Capacitor 25 Second case electrode 27 Light emitting diode 28 External electrode 29 Controller unit

Claims (4)

A bobbin case that holds the bobbin around which the lower thread is wound, a tension applying member that is provided in the bobbin case and applies tension to the lower thread fed out of the bobbin case, and holds the bobbin case inside And a sewing machine hook device having an inner hook that holds the inner hook therein and rotates with respect to the inner hook to cause the upper hook loop captured by a sword to pass through the inner hook. In the lower thread tension adjusting device
A magnet provided on a surface of the outer hook facing the inner hook;
A coil provided on a surface of the inner hook facing the magnet;
An inner hook electrode provided on a surface in contact with the bobbin case inside the inner hook, and receiving electric power generated between the magnet and the coil by rotation of the outer hook relative to the inner hook;
A case electrode that is provided in the bobbin case and receives power supplied from the inner hook electrode;
A receiving element provided in the bobbin case for receiving a control signal in a non-contact manner;
A transmitting element that is disposed apart from the hook device and transmits a control signal to the receiving element;
A control unit for controlling the transmitting element;
A tension adjusting member that is connected to the case electrode and adjusts the tension to the lower thread by the tension applying member by electric power supplied from the case electrode according to a control signal received by the receiving element from the transmitting element. A bobbin thread tension adjusting device characterized by comprising: The case electrode is a first case electrode,
A second case electrode provided on an outer surface of the bobbin case and connected to the tension adjusting member;
An external electrode that contacts the second case electrode when the outer hook is stopped or when a sewing machine is turned on, and supplies electric power to the tension adjusting member via the second case electrode;
2. The lower thread tension adjusting device according to claim 1, wherein the external electrode is moved to a position away from the hook device after power is supplied to the tension adjusting member.   The transmitting element and the external electrode, the receiving position where the receiving element can receive a control signal from the transmitting element, the contactable position where the external electrode is in contact with the second case electrode, and the bobbin case The bobbin thread tension adjusting device according to claim 2, wherein the bobbin thread tension adjusting device is provided so as to be integrally movable between three positions of the detachable positions that are detachable from the inner hook. A bobbin case that holds a bobbin around which a lower thread is wound, a tension applying member that is provided in the bobbin case and applies tension to the lower thread that is fed out of the bobbin case, and the bobbin case inside A sewing machine having an inner hook that holds the inner hook, and an outer hook that holds the inner hook inside and causes the upper hook to loop through the upper hook loop captured by a sword tip by rotating relative to the inner hook. In the lower thread tension adjusting device provided,
A rechargeable battery provided in the inner hook and rechargeable when the outer hook stops rotating;
An inner hook electrode provided on a surface in contact with the bobbin case inside the inner hook, and receiving electric power supplied from the rechargeable battery;
A case electrode that is provided in the bobbin case and receives power supplied from the inner hook electrode;
A receiving element provided in the bobbin case for receiving a control signal in a non-contact manner;
The transmitting element that is disposed apart from the hook device and transmits a control signal to the receiving element;
A control unit for controlling the transmitting element;
A tension adjusting member that is connected to the case electrode and adjusts the tension to the lower thread by the tension applying member by electric power supplied from the case electrode according to a control signal received by the receiving element from the transmitting element. A bobbin thread tension adjusting device characterized by comprising:

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