EP2196572B1 - Steuerungsvorrichtung für eine geringere Fadenspannung - Google Patents

Steuerungsvorrichtung für eine geringere Fadenspannung Download PDF

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Publication number
EP2196572B1
EP2196572B1 EP09176975A EP09176975A EP2196572B1 EP 2196572 B1 EP2196572 B1 EP 2196572B1 EP 09176975 A EP09176975 A EP 09176975A EP 09176975 A EP09176975 A EP 09176975A EP 2196572 B1 EP2196572 B1 EP 2196572B1
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EP
European Patent Office
Prior art keywords
thread
bobbin case
tensioning spring
lower thread
support member
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Application number
EP09176975A
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English (en)
French (fr)
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EP2196572A1 (de
Inventor
Hiroyuki Kazehare
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Juki Corp
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Juki Corp
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Publication of EP2196572A1 publication Critical patent/EP2196572A1/de
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices

Definitions

  • the present invention relates to a lower thread tension control device adapted to control a tension of a lower thread to be drawn out from a bobbin case of a sewing machine, (see JP-A-2009 261 551 and JP- A- 2009 261 550 ).
  • a needle drive mechanism which causes a sewing needle to reciprocate in the up-down direction
  • a shuttle mechanism including a shuttle for forming stitches in cooperation with the sewing needle inside a bed of a sewing machine frame
  • the shuttle includes an outer shuttle which is driven to rotate, an inner shuttle which is held inside the outer shuttle so as not to rotate, and a bobbin case which is removably fitted to the inner shuttle, and the bobbin case houses a bobbin around which a lower thread is wound.
  • the lower thread to be drawn out from the bobbin is supplied by an appropriate amount depending on sewing conditions.
  • the bobbin case is provided with, for example, as shown in Fig. 10 , a member which adjusts the tension of the lower thread.
  • a thread tensioning spring (leaf spring) 102 is attached by a fixation screw 103, a lower thread T (see Fig. 13 ) is disposed between the thread tensioning spring 102 and the bobbin case 101, and by pressing the lower thread by the thread tensioning spring 102, a tension is applied to the lower thread.
  • a thread pressing portion 102a of the thread tensioning spring 102 is separated from the outer circumferential surface 101a of the bobbin case 101 at a distance greater than the distance at which the thread pressing portion 102a holds the lower thread onto the outer circumferential surface 101a of the bobbin case 101.
  • the lower thread is not held between the thread pressing portion 102a of the thread tensioning spring 102 and the outer circumferential surface 101a of the bobbin case 101.
  • the thread pressing portion 102a of the thread tensioning spring 102 contacts the outer circumferential surface 101a of the bobbin case 101 (a preload from the adjust screw exists). Accordingly, the lower thread is pinched, and a frictional force is generated when the lower thread is drawn out, and the lower thread is tensioned.
  • the tension of the lower thread in the bobbin case 101 is adjusted after removing the bobbin case 101 from the shuttle, by turning the adjust screw 104 with a screwdriver.
  • a thread tensioning spring (a leaf spring) 113 made of a magnetic material is provided on the outer circumferential surface 112a of the bobbin case 112, an electromagnet 114 is provided on the outer side surface of a shuttle (not shown) outside the bobbin case 112 in the vicinity of the thread tensioning spring 113, and this electromagnet 114 is supplied with a current in accordance with a sewing speed.
  • the thread tensioning spring 113 of a magnetic material is attracted toward the electromagnet 114. Accordingly, as shown by two-dotted chain lines in Figs. 13 and 14 , the thread tensioning spring 113 is moved in a direction of separating from or approaching the outer circumferential surface 112a of the bobbin case 112. That is, the tension of the lower thread T can be adjusted in real time in the range of an initial tension, so that the tension of the lower thread T to be pulled out from the bobbin can be adjusted even while sewing.
  • a thread inserting slit 115 which guides the lower thread T to a thread hole (not shown) so as to pull the lower thread T out from the inside to the outside of the bobbin case 112 is provided, whereas on the outer circumferential surface 112a of the bobbin case 112 of the lower thread tension control device 111 A shown in Fig. 14 , the thread inserting slit 115 is not formed.
  • the tension of the lower thread cannot be varied during operation of the sewing machine, so that, for example, the tension of the lower thread cannot be adjusted to be proper when the thickness of cloth changes while sewing.
  • the sewing stitch type cannot be changed between whip stitches and purl stitches, for example.
  • the conventional lower thread tension control devices 111 and 111A shown in Figs. 13 and 14 which can automatically adjust the tension do not have an adjusting function of adjusting the initial tension of the lower thread T like the thread tensioning spring 102 of the bobbin case 101, and thus cannot adjust the initial tension of the lower thread T.
  • the conventional lower thread tension control devices 111 and 111A are configured such that the thread tensioning spring 113 is attracted by the electromagnet 114 provided on the outer side surface of the shuttle, and the distance that separates the electromagnet 114 and the thread tensioning spring 113 is great, and the magnetic force, generation direction is not toward the thread tensioning spring 113. Therefore, the generation efficiency of the magnetic attractive force is low, that is, the magnetic resistance is high, and the magnetic fluxes cannot be concentrated, and a sufficient magnetic attractive force is not generated, so that the variable range of the tension of the lower thread T is narrow.
  • the electromagnet 114 is increased in size to increase the magnetic attractive force, when replacing the bobbin, the electromagnet 114 obstructs the replacement and deteriorates the operability, and the magnetic attractive force to be applied to the shuttle, the bobbin, and the bobbin case 112, etc., is also increased, and the thread pull-up resistance when the upper thread comes out from the inner shuttle increases and the upper thread cannot be sufficiently pulled up, and the sewing quality is deteriorated.
  • the thread tensioning spring 113 is directly fixed to the bobbin case 112, so that depending on individual differences of the fixed position of the thread tensioning spring 113 and the curvature of the thread tensioning spring 113, the tension widely varies. To reduce the tension variation, a tension controllable range must be individually measured, and the tension adjustment takes time.
  • a first aspect of the present invention provides a lower thread tension control device including:
  • the force of pressing the lower thread by the thread pressing portion of the thread tensioning spring can be controlled, so that the tension to be applied to the lower thread can easily and reliably be controlled even during operation of the sewing machine.
  • the force of pressing the lower thread by the thread pressing portion of the thread tensioning spring can also be adjusted by the screwing amount of the adjust screw, so that the initial tension to be applied to the lower thread can easily and reliably be controlled.
  • the initial tension to be applied to the lower thread and the tension to be applied to the lower thread during the operation of the sewing machine can easily and reliably be changed individually.
  • the tension of the lower thread can reliably and easily be changed when needed.
  • the electromagnet is disposed to face the bottom wall substitute portion.
  • a lower thread tension control device is used in a sewing machine with a horizontal full rotary shuttle such as a lockstitch sewing machine.
  • a sewing machine M to which the lower thread tension control device 1 of the embodiment is attached includes a sewing machine arm MA including a known needle drive mechanism (not shown), and a sewing machine bed MB including a known shuttle drive mechanism (not shown).
  • a horizontal shuttle 2 which is a horizontal full rotary shuttle as a shuttle is disposed on the left side in Fig. 1 of the sewing machine bed MB, and an outer shuttle 3 ( Fig. 2 ) of the horizontal shuttle 2 is driven to rotate in synchronization with up-down movements of the sewing needle N.
  • the lower thread pension control device 1 of the embodiment is disposed in the horizontal shuttle 2.
  • this horizontal shuttle 2 includes an outer shuttle 3 to be driven to rotate around a rotation axis center RL extending horizontally, and an inner shuttle 4 held while being stopped from rotating inside the outer shuttle 3.
  • the inner shuttle 4 is prevented by an inner shuttle stopper as an inner shuttle rotation stopper attached to the sewing machine frame (both are not shown) from following the rotation of the outer shuttle 3 when the outer shuttle 3 rotates.
  • a bobbin case 11 to be fitted to the inner shuttle 4 has a bottomed cylindrical shape as a whole, and inside this, a bobbin around which a lower thread T is wound is housed rotatably and removably from the opening end.
  • the bobbin case 11 may be made of a magnetic material or a nonmagnetic material, but for efficiently driving a support member 17 by a magnetic force, the bobbin case 11 is preferably made of a nonmagnetic material such as a resin, nonferrous metal, austenite-based stainless steel, aluminum, and ceramics.
  • the bobbin case 11 is fitted so that its opening end is opposed to the shuttle bottom surface exposed to the outside of the inner shuttle 4, and is disposed so that the outer surface of the bottom portion of the bobbin case 11 is exposed to the outside.
  • a thread hole 12 and a thread inserting slit 13 communicating with the thread hole 12 are formed, and by sliding one end of the lower thread T into a slit entrance 13a of the thread inserting slit 13 provided on the opening end side of the bobbin case 11, the lower thread T is led to the outside from the inside of the bobbin case 11 via the thread hole 12, specifically, led to the outer circumferential surface 11b of the bobbin case 11.
  • a thread tensioning spring 14 provided on a support member 17 is disposed on the outer circumferential surface 11b of the bobbin case 11.
  • the thread tensioning spring 14 is for applying tension to the lower thread T by pressing the lower thread T to be pulled outside of the bobbin case 11 from the bobbin via the thread hole 12, and includes a thread pressing portion 14a disposed so as to cover the thread hole 12 and a fixing portion 14b disposed away (downwardly away in Fig. 2 ) from the thread pressing portion 14a.
  • the thread tensioning spring 14 is removably attached to the bobbin case 11 by a fixation screw 15 screwed to the support member 17 described later via the fixing portion 14b.
  • an opening 16 (a hatched region in Fig. 6 ) which makes the inside of the bobbin case 11 communicate with the outside is formed.
  • This opening 16 is formed at a position which is near the formation portion of the thread hole 12 of the bobbin case 11 so as not to interfere with the thread inserting slit 13 ( Fig. 4 , Fig. 6 ).
  • the support member 17 made of a magnetic material, preferably, a ferromagnetic material is disposed to form a part of the bobbin case 11.
  • This support member 17 includes an arc-shaped circumferential wall substitute portion 17a forming (substituting for) a part of the circumferential wall 11a of the bobbin case 11, and a flat-shaped bottom wall substitute portion 17b forming (substituting for) a part of the bottom wall 11c of the bobbin case 11, and has a substantially L-shaped section as a whole.
  • a support shaft 18 is inserted in the bent portion between the circumferential wall substitute portion 17a and the bottom wall substitute portion 17b of the support member 17. As shown in Fig. 4 , this support shaft 18 is disposed on an axis line orthogonal to the axial direction of the bobbin case 11 and the orthogonal line A-A passing through the axis, and both ends of the support shaft 18 are fitted in and attached to the vicinity of the opening 16 of the bobbin case 11.
  • the support member 17 is supported so as to be rotatable around the support shaft 18.
  • an adjust screw 19 is screwed via the intermediate portion 14c between the thread pressing portion 14a and the fixing portion 14b of the thread tensioning spring 14. Further, to the circumferential wall substitute portion 17a of the support member 17, the fixation screw 15 is screwed via the fixing portion 14b disposed away from the thread pressing portion 14a of the thread tensioning spring 14. That is, as described above, the thread tensioning spring 14 is removably attached to the bobbin case 11 by the fixation screw 15 screwed to the support member 17 via the fixing portion 14b.
  • the thread tensioning spring 14, the fixed screw 15, the support shaft 18, and the adjust screw 19 may be made of a magnetic material or a nonmagnetic material such as austenite-based stainless steeL
  • the thread tensioning spring means 70 turnable for pressing the thread pressing portion 14a of the thread tensioning spring 14 to the outer circumferential surface 11b of the bobbin case 11 of the embodiment consists of the thread tensioning spring 14, the fixation screw 15, the support member 17, the support shaft 18, and the adjust screw 19.
  • an elastic member which functions as a loosening stopper for the adjust screw 19 may be disposed between the thread tensioning spring 14 and the portion opposed to the thread tensioning spring 14 of the support member 17, an elastic member which functions as a loosening stopper for the adjust screw 19 may be disposed.
  • a washer such as a conical spring washer or a spring washer, or an annular packing made of an elastic material such as rubber may be used.
  • a stopper 21 for limiting a turning range of the support member 17 when turning around the support shaft 18 is formed.
  • the bobbin case 11 is provided with a stopper 21 for limiting a movable range of the thread tensioning spring means 20.
  • This stopper 21 includes a first stopper 21a formed on the outer surface of the bottom wall 11c of the bobbin case 11, and a second stopper 21b formed by an opening end of the circumferential wall 11a of the bobbin case 11.
  • the first stopper 21 a restricts a maximum position of clockwise rotation in Fig. 7 of the support member 17 around the support shaft 18.
  • the second stopper 21b restricts a maximum position of counterclockwise rotation in Fig. 7 of the support member 17 around the support shaft 18.
  • the support member 17 is formed so as to normally hold a state in which the bottom wall substitute portion 17b is in contact with the first stopper 21a by a spring force of the thread tensioning spring 14.
  • a known latch 24 for holding the bobbin case 11 so as to prevent the bobbin case 11 from coming off the inner shuttle 4 is provided, and this latch 24 is provided with a latch lever 24a for releasing the state held by the latch 24 of the bobbin case 11 when removing the bobbin case 11 fitted to the inner shuttle 4.
  • an electromagnet 26 is disposed to face the bottom wall substitute portion 17b of the support member 17.
  • This electromagnet 26 includes an iron core 26a made of a magnetic material such as soft iron, and a coil 26b around which an insulated electric wire is closely wound ( Fig. 2 ).
  • the electromagnet 26 is supported on the sewing machine frame or a support stay attached to the sewing machine frame not shown so that the longitudinal direction of the iron core 26a extends horizontally.
  • a side view of the electromagnet 26 is shown in Fig. 1 .
  • the electromagnet 26 is electrically connected to a control section 31 including a CPU 32 which functions as an arithmetic section and a memory 33 which functions as a storage section, etc., and based on control commands sent out from the control section 31, a timing of switching between an energized state and an non-energized state of the electromagnet 26, that is, the coil 26b, the energization time, and a current value during energization, etc., are controlled ( Fig. 2 ).
  • a magnetic attractive force F is generated between the electromagnet 26 and the bottom wall substitute portion 17b of the support member 17, and this magnetic attractive force F rotates the support member 17 counterclockwise in Fig. 7 around the support shaft 18.
  • a maximum position of the rotation of the support member 17 by the magnetic attractive force F is restricted by contact of the circumferential wall substitute portion 17a with the second stopper 21b.
  • a state in which the circumferential wall substitute portion 17a of the support member 17 comes into contact with the second stopper 21b by energizing the electromagnet 26 is shown in Fig. 8 along with the application direction of the magnetic attractive force F.
  • the support member 17 restores to the original state where the bottom wall substitute portion 17b is in contact with the first stopper 21a.
  • the remaining configuration of the bobbin case 11 is the same as conventionally known, so that detailed description thereof is omitted.
  • the lower thread tension control device 1 of the embodiment has two modes of a non-energized state where the coil 26b of the electromagnet 26 is not energized and an energized state.
  • a spring force of the thread tensioning spring 14 is applied to the support member 17 and holds a state in which the bottom wall substitute portion 17b is in contact with the first stopper 21a.
  • the thread tensioning spring 14 presses a portion including the thread hole 12 of the bobbin case 11 by the thread pressing portion 14a, and applies a fixed initial tension to the lower thread T to be pulled out from the bobbin via the thread hole 12.
  • the warp amount of the thread tensioning spring 14 is adjusted by a tightening amount of the adjust screw 19.
  • the adjust screw 19 is preloaded by a reactive force depending on the warp amount of the thread tensioning spring 14. When this preload is not applied or small, the adjust screw 19 is loosened by vibrations during operation of the sewing machine, and the tension to be applied to the lower thread T is reduced and the adjust screw 19 comes off.
  • the adjust screw 19 needs to be tightened until it is sufficiently preload by the reactive force of the thread tensioning spring 14.
  • the thread tensioning spring 102 is sufficiently separated from the outer circumferential surface 101a of the bobbin case 101 at a distance greater than the distance at which the thread tensioning spring 102 holds the lower thread onto the outer circumferential surface 101a of the bobbin case 101, so that the lower thread T is not tensioned.
  • the thread tensioning spring 102 comes closer to the outer circumferential surface 101a of the bobbin case 101 and comes into contact with this, and accordingly, the thread tensioning spring 104 pinches the lower thread T, and a frictional force with the lower thread T is generated, and the lower thread is tensioned.
  • the lower thread tension is not generated until the force applied to the portion of the thread tensioning spring 102, at which the adjust screw 104 is attached, reaches the force 1, and when the applied force exceeds the force 1, the thread tensioning spring 102 can hold the lower thread T onto the outer circumferential surface 101a of the bobbin case 101, so that the lower thread tension increases as the applied force is further increased.
  • the fixation screw 15 and the adjust screw 19 are attached to the support member 17, so that the preload of the adjust screw 19 due to the reactive force of the thread tensioning spring 14 is canceled out by the intermediate portion 14c provided on the support member 17, so that the preload does not affect the force applied to the thread tensioning spring 14. Therefore, as shown in the tension characteristic 2 of Fig. 9 (tension characteristic according to embodiment of the present invention), the lower thread tension is already generated when the applied force is zero, and the force to be applied in order to obtain the required lower thread tension variable range is the force 2 at a maximum. That is, the force to be applied in order to obtain a certain lower thread tension variable range can be reduced by an amount corresponding to a difference between the force 1A and the force 2, and the efficiency of lower thread tension generation is improved.
  • the initial tension to be applied to the lower thread T can be adjusted by turning the adjust screw 19 by a screwdriver by removing the bobbin case 11 from the sewing machine after stopping the sewing machine in the same manner as in the case of the conventional bobbin case 101.
  • the configuration of the bobbin case 11 is similar to the conventional bobbin case 101 except that the bobbin case 11 is provided with the support member 17, and the fixation screw 15 and the adjust screw 19 are screwed to the support member 17, and therefore, for setting the tightening amount of the adjust screw 19, the adjustment experiences of the tension of the lower thread T in the bobbin-case 101 including the thread tensioning spring 102 can be utilized.
  • a magnetic attractive force F shown by a thick arrow in Fig. 8 is generated between the electromagnet 26 and the bottom wall substitute portion 17b of the support member 17. Then, when the magnetic attractive force F exceeds the spring force of the initial tension of the thread tensioning spring 14, an angle of counterclockwise rotation shown by the arrow in Fig. 8 of the support member 17 around the support shaft 18 is determined based on the magnetic attractive force F and a spring constant of the thread tensioning spring 14, and the support member 17 pushes the intermediate portion 14c of the thread tensioning spring 14 toward the center of the bobbin case 11 as much as the angle.
  • the thread tensioning spring 14 warps and the force of pressing the lower thread T by the thread pressing portion 14a increases, and the frictional force of the lower thread T pinched between the thread pressing portion 14a of the thread tensioning spring 14 and the outer circumferential surface 11b of the bobbin case 11 increases, and the tension of the lower thread T also increases.
  • the magnetic force of the electromagnet 26 that is, the strength and weakness of the magnetic force of the electromagnet 26 can be changed. Therefore, by changing the current value to be supplied to the coil 26b, the force of pressing the lower thread T by the thread pressing portion 14a of the thread tensioning spring 14 changes, so that the tension of the lower thread T also changes.
  • the tension of the lower thread T can be increased or reduced. This increase and reduction of the tension of the lower thread T are possible even while sewing.
  • the support member 17 is configured so as to form a part of the bobbin case 11, so that the outer diameter size of the bobbin case 11 does not become larger and the inner diameter size of the bobbin case 11 does not become smaller.
  • the ordinary bobbin can be used, so that the thread winding amount of the lower thread T around the bobbin does not change from the ordinary amount, and the frequency of replacement of the bobbin does not change from the ordinary frequency.
  • the lower thread tension control device 1 of the embodiment can be used in an existing sewing machine.
  • the lower thread tension control device 1 of the embodiment includes a thread tensioning spring means which presses the thread pressing portion 14a of the thread tensioning spring 14 to the outer circumferential surface 11a of the bobbin case 11.
  • the thread tensioning spring means includes a support member 17 made of a magnetic material so as to have an L-shaped section by the circumferential wall substitute portion 17a forming a part of the circumferential wall of the bobbin case 11 and the bottom wall substitute portion 17b forming a part of the bottom wall continued to the circumferential wall of the bobbin case 11, the fixation screw 15 to be screwed to the support member 17 via a fixing portion 14b disposed away from the thread pressing portion 14a of the thread tensioning spring 14, the adjust screw 19 to be screwed to the support member 17 via the intermediate portion 14c between the thread pressing portion 14a and the fixing portion 14b of the thread tensioning spring 14, and the support shaft 18 which has ends attached to the bobbin case 11, and is inserted in the bent portion of the support member 17.
  • the support member 17 is rotatable around the support shaft 18.
  • the force of pressing the lower thread T by the thread pressing portion 14a of the thread tensioning spring 14 can be controlled by a screwing amount of the adjust screw 19, so that the initial tension to be applied to the lower thread T can easily and reliably be controlled.
  • the lower thread tension control device 1 of the embodiment described above by changing the current to be supplied to the electromagnet 26, the force of pressing the lower thread T by the thread pressing portion 14a of the thread tensioning spring 14 can be controlled, so that the tension to be applied to the lower thread T can easily and reliably be controlled even during operation of the sewing machine.
  • the initial tension to be applied to the lower thread T and the tension to be applied to the lower thread T during operation of the sewing machine can be easily and reliably varied individually.
  • the tension of the lower thread T can be reliably and easily changed when needed.
  • the lower thread tension control device 1 of the embodiment is configured such that the distance between the electromagnet 26 and the support member 17, to which the magnetic attractive force F is applied, is short, and the magnetic force generation direction is in the application direction of the magnetic attractive force F, and therefore, the magnetic force generation efficiency is very high, and the thrust of the preload from the adjust screw 19, which adjusts the initial tension, is not to be influenced by the tension control, so that a high tension can be variably controlled with a very small magnetic attractive force.
  • the magnetic attractive force F necessary for varying the lower thread tension can be small, and the magnetic flux influence range is limited, so that the magnetic attractive force F to be applied to the bobbin case 11 and the inner shuttle 4 can be small, and the influence on the sewing quality is small.
  • the current to be supplied to the electromagnet 26 can be small, so that the heating and power consumption of the electromagnet 26 can be reduced, and an energy-saving configuration can be realized.
  • the bobbin case 11 is provided with the stopper 21 which limits the movable range of the thread tensioning spring means, so that the thread tensioning spring means can be reliably prevented from coming into contact with the bobbin housed inside the bobbin case 11 and the lower thread T.
  • the initial tension to be applied to the lower thread T can be controlled by a screwing amount of the adjust screw 19, so that the operation of adjusting the initial tension to be applied to the lower thread T is possible as in the bobbin case 101, conventional adjustment information can also be utilized, and parts such as magnets whose characteristics are very different individually are not used, so that the initial tension scattering can be easily reduced by adjustment.
  • the bobbin case 11 is provided with a thread inserting slit 13, so that it is convenient for an operator who performs a threading operation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)

Claims (2)

  1. Unterfadenspannungssteuerungsvorrichtung (1), umfassend:
    ein Spulengehäuse (11), welches in Form eines Zylinders mit einem Boden ausgebildet ist, wobei eine mit einem Unterfaden bewickelte Spule von einem öffnungsseitigen Ende des Spulengehäuses (11) her mit dem Spulengehäuse (11) verbindbar und von demselben lösbar ist;
    ein Fadenspannungsfedermittel (20), umfassend eine Fadenspannungsfeder (14), welche den Unterfaden presst, um dem Unterfaden Spannung zu erteilen, wobei der Unterfaden über ein in einer Außenumfangsoberfläche (11b) des Spulengehäuses (11) gebildetes Fadenloch (12) aus dem Spulengehäuse (11) abgezogen wird, und wobei ein Fadenpressbereich (14a) der
    Fadenspannungsfeder (14) zu der Außenumfangsoberfläche (11b) des Spulengehäuses (11) hin gepresst wird; und
    einen Elektromagnet (26), der außerhalb des Spulengehäuses (11) so angeordnet ist, dass er dem Fadenspannungsfedermittel (20) zugewandt ist,
    dadurch gekennzeichnet, dass das Fadenspannungsfedermittel (20) umfasst:
    ein Halteglied (17), umfassend einen
    Umfangsoberflächensubstitutionsbereich (17a), welcher einen Teil einer Umfangsoberfläche (11a) des Spulengehäuses (11) bildet, und einen Bodenwandsubstitutionsbereich (17b), der einen Teil einer Bodenwand (11c) bildet, die sich von der Umfangsoberfläche (11a) des Spulengehäuses (11) fortsetzt, wobei das Halteglied (17) einen L-förmigen Querschnitt aufweist und aus einem magnetischen Material hergestellt ist und wobei das Halteglied (17) einen
    Fixierungsbereich (14b) der Fadenspannungsfeder (14), der von dem Fadenpressbereich (14a) entfernt angeordnet ist, sicher hält;
    eine Stellschraube (19), welche durch einen zwischen dem Fadenpressbereich (14a) und dem Fixierungsbereich (14b) liegenden Zwischenbereich (14c) der Fadenspannungsfeder (14) hindurch mit dem Halteglied (17) verschraubt ist; und
    eine Haltewelle (18), welche einen gekrümmten Bereich des Halteglieds (17) drehbar an dem Spulengehäuse (11) hält,
    wobei eine Magnetkraft (F) des Elektromagnets (26) das Halteglied (17) um die Haltewelle (18) rotieren lässt, um den Fadenpressbereich (14a) der Fadenspannungsfeder (14) zu der Außenumfangsoberfläche (11b) des Spulengehäuses (11) hin zu pressen, und eine Presskraft des Fadenpressbereichs (14a) der Fadenspannungsfeder (14) gegen den Unterfaden gemäß einer Änderung in einem dem Elektromagneten (26) zugeführten Strom gesteuert wird, und
    wobei eine Anfangsspannung, die der Fadenpressbereich (14a) der Fadenspannungsfeder (14) dem Unterfaden durch Pressen des Unterfadens erteilt, gemäß einem Schraubausmaß der Stellschraube (19) gesteuert wird.
  2. Unterfadenspannungssteuerungsvorrichtung (1) nach Anspruch 1, wobei der Elektromagnet (26) so angeordnet ist, dass er dem Bodenwandsubstitutionsbereich (17b) zugewandt ist.
EP09176975A 2008-11-25 2009-11-25 Steuerungsvorrichtung für eine geringere Fadenspannung Active EP2196572B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008299413A JP5253980B2 (ja) 2008-11-25 2008-11-25 下糸張力制御装置

Publications (2)

Publication Number Publication Date
EP2196572A1 EP2196572A1 (de) 2010-06-16
EP2196572B1 true EP2196572B1 (de) 2011-08-24

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EP (1) EP2196572B1 (de)
JP (1) JP5253980B2 (de)
CN (1) CN101736537B (de)
AT (1) ATE521745T1 (de)

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JP6692573B2 (ja) * 2016-01-15 2020-05-13 Juki株式会社 ミシンのボビンケース
EP3523469B1 (de) * 2016-10-08 2020-10-07 Oerlikon Textile GmbH & Co. KG Vorrichtung zum kühlen eines erwärmten fadens
CN106637731A (zh) * 2017-02-16 2017-05-10 吴江市震宇缝制设备有限公司 一种缝纫机防乱线梭芯
CN111989431A (zh) 2018-06-22 2020-11-24 泰科尼卡株式会社 双针平缝机
CN115262112B (zh) * 2022-08-25 2023-12-12 中山市伊诺特智能科技有限公司 一种电脑绣花机和缝纫机通用的梭套

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Publication number Priority date Publication date Assignee Title
US3051108A (en) * 1961-08-24 1962-08-28 Singer Mfg Co Tension release mechanism for sewing machines
JPS6117736Y2 (de) * 1980-09-26 1986-05-30
JPS58216090A (ja) * 1982-06-10 1983-12-15 蛇の目ミシン工業株式会社 ミシンの下糸張力調節装置
JPS61228895A (ja) * 1985-04-03 1986-10-13 株式会社廣瀬製作所 全回転かま使用ミシンの内かま安定装置
JPS61268292A (ja) * 1985-05-23 1986-11-27 蛇の目ミシン工業株式会社 ミシンの上下糸調節装置
JPH0568764A (ja) * 1991-09-13 1993-03-23 Juki Corp ミシンの下糸制御装置
JP2008023047A (ja) * 2006-07-20 2008-02-07 Juki Corp 下糸張力制御装置
JP2008119078A (ja) * 2006-11-09 2008-05-29 Juki Corp ミシンの下糸張力制御装置
JP5147518B2 (ja) * 2008-04-24 2013-02-20 Ｊｕｋｉ株式会社 下糸張力制御装置
JP5197129B2 (ja) * 2008-04-24 2013-05-15 Ｊｕｋｉ株式会社 下糸張力制御装置

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CN101736537A (zh) 2010-06-16
EP2196572A1 (de) 2010-06-16
ATE521745T1 (de) 2011-09-15
JP2010124863A (ja) 2010-06-10
JP5253980B2 (ja) 2013-07-31
CN101736537B (zh) 2013-05-29

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