A displacement detection sensor (1, 1A, 1B) is a sensor for detecting two positions away from each other, and comprises: a primary coil unit (10) that is excited upon receiving power supplied from a signal source (2, 30C); and a secondary coil unit (20) that is disposed at a position magnetically coupled to the primary coil unit. In the primary and secondary coil units, the inductances of the primary and secondary coil units change through movement, relative to the primary and secondary coil units, of a measurement body (4) composed of a magnetic body or a non-magnetic body having conductivity. One of the primary and secondary coil units has two coils (21, 22) arranged apart from each other and differentially connected to each other.
A low-cost sewing machine capable of achieving a desired balance between needle thread consumption and bobbin thread consumption is described. A memory section stores needle thread requirement data having precorrected needle thread requirement and postcorrected needle thread requirement. In a torque control zone, rotating force is imparted to a turning arm so as to impart a tension on the needle thread according to a torque value, while closing an upstream grip section main body and while opening a downstream grip section main body. In a first position control zone, the needle thread is drawn according to the postcorrected needle thread requirement, while opening the upstream grip section main body and while closing the downstream grip section. In a second position control zone, the turning arm is returned to an initial position, while closing the upstream grip section main body and while opening the downstream grip section main body.
D05B 47/04 - Dispositifs de commande automatique de tension du fil
D05B 19/12 - Machines à coudre commandées par programme comprenant une mémoire électronique ou une unité de commande par microprocesseur caractérisées par la commande du fonctionnement de la machine
D05B 45/00 - Adaptation de dispositifs de mesure pour déterminer la longueur des fils utilisée par les machines à coudre
[Problem] To provide a sewing machine with which it is possible, at a low cost, to achieve a desired balance between the amount of upper thread used and the amount of lower thread used. [Solution] A storage unit 92 stores upper thread amount data comprising an upper thread amount required before correction and an upper thread amount required after correction. In a torque control section, rotation force is applied to a turning arm 1281 so that tensile force will be applied to the upper thread according to a torque value in a state in which an upstream gripper body 1241 is closed and a downstream gripper body 1261 is open. In a first-position control section, the upper thread is pulled out according to the upper thread amount required after correction, in a state in which the upstream gripper body 1241 is open and the downstream gripper body 1261 is closed. In a second-position control section, the turning arm 1281 is returned to the initial position in a state in which the upstream gripper body 1241 is closed, and the downstream gripper body 1261 is open. The upper thread amount required before correction is compared with the upper thread amount used in the torque control section, and the upper thread amount after correction is corrected.
D05B 19/12 - Machines à coudre commandées par programme comprenant une mémoire électronique ou une unité de commande par microprocesseur caractérisées par la commande du fonctionnement de la machine
D05B 45/00 - Adaptation de dispositifs de mesure pour déterminer la longueur des fils utilisée par les machines à coudre
D05B 47/04 - Dispositifs de commande automatique de tension du fil
Disclosed is a sewing machine which evaluates sewing quality using a stitch tightness index. During sewing operation, a used length of an upper thread per stitch is detected, and a stitch tightness index per sewn stitch is calculated on the basis of a stitch length per stitch defined by sewing pattern data, a fabric thickness of a sewing workpiece, and detected data of the used length of the upper thread. Then, notification is made which corresponds to the calculated stitch tightness index per sewn stitch (such as a visual display of the stitch tightness index). After that, acceptability/non-acceptability of the thread tightness per sewn stitch can be determined by comparing the calculated stitch tightness index per sewn stitch against a reference value, and a result of the determination can be notified.
D05B 45/00 - Adaptation de dispositifs de mesure pour déterminer la longueur des fils utilisée par les machines à coudre
D05B 19/12 - Machines à coudre commandées par programme comprenant une mémoire électronique ou une unité de commande par microprocesseur caractérisées par la commande du fonctionnement de la machine
D05B 47/00 - Dispositifs de réglage de tension du fil d'aiguille pour machines à coudreAdaptations d'appareils de mesure de la tension des machines à coudre
D05B 55/00 - Porte-aiguilles pour machines à coudreBarres à aiguilles pour machines à coudre
A rotation detector includes the following: a rotor and stators comprising a rotor substrate and stator substrates, each of which is a multilayer substrate; a rotor coil provided on the rotor substrate; and detection coils provided on the stator substrates. The frequency of an excitation signal used by said rotation detector is set so as to be higher than a prescribed frequency that would be required if the rotor and the stators were each made of a magnetic material.
G01B 1/00 - Instruments de mesure caractérisés par l'usage d'un matériau spécifique
G01D 5/20 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens électriques ou magnétiques influençant la valeur d'un courant ou d'une tension en faisant varier l'inductance, p. ex. une armature mobile
G01D 1/00 - Dispositions pour la mesure donnant des résultats autres que la valeur instantanée d'une variable, d'application générale
A rotation-detecting apparatus includes the following: a rotor coil provided on a rotor; detection coils provided on stators; a control circuit that detects the relative rotational angle between the rotor and the stators by processing detection signals induced in the detection coils as a result of the rotor coil being excited by an excitation signal; and a communicating means for performing data communication with an external device. The control circuit in the rotation-detecting apparatus has functionality whereby a switch signal that turns on and off at preset rotational angles is outputted on the basis of the aforementioned detection signals. Also, the control circuit is designed such that the set rotational angles for the aforementioned switch signal can be changed by the external device via the abovementioned communicating means.
G01B 7/30 - Dispositions pour la mesure caractérisées par l'utilisation de techniques électriques ou magnétiques pour mesurer des angles ou des cônesDispositions pour la mesure caractérisées par l'utilisation de techniques électriques ou magnétiques pour tester l'alignement des axes
H02K 11/21 - Dispositifs pour détecter la vitesse ou la position, ou actionnés par des valeurs de ces variables
H02K 11/33 - Circuits d’entraînement, p. ex. circuits électroniques de puissance
H02K 29/12 - Moteurs ou génératrices à dispositifs de commutation non mécaniques, p. ex. tubes à décharge ou dispositifs à semi-conducteurs avec des dispositifs détecteurs de la position utilisant des bobines détectrices
G01D 5/20 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens électriques ou magnétiques influençant la valeur d'un courant ou d'une tension en faisant varier l'inductance, p. ex. une armature mobile
B60K 1/00 - Agencement ou montage des ensembles de propulsion électriques
B60L 1/00 - Fourniture de l'énergie électrique à l'équipement auxiliaire des véhicules à traction électrique
H02K 37/04 - Moteurs à rotor tournant pas à pas et sans rupteur ou commutateur actionné par le rotor, p. ex. moteurs pas à pas du type à réluctance variable les rotors étant disposés à l'intérieur des stators
The present invention relates to a sewing machine which evaluates sewing quality using a thread tightening index. During a sewing operation, an upper thread used length (U) used for each stitch is detected, and a thread tightening index (Ks) for each sewn stitch is calculated on the basis of a stitch length (M) for each stitch, defined in accordance with sewing pattern data, a fabric thickness (t) of the object being sewn, and the detected upper thread used length (U) data. A report (for example a display of the thread tightening index Ks) corresponding to the thread tightening index (Ks) calculated for each sewn stitch is issued. By comparing the thread tightening index (Ks) calculated for each sewn stitch with a reference value (Kref), the acceptability of the thread tightness for each sewn stitch can be assessed, and the assessment results can be reported.
c of a sewing machine is provided with a main body 210, a swayingly reciprocating mechanism section 230, and a thread hooking rod drive motor 240. The swayingly reciprocating mechanism section 230 has a thread hooking rod 236, and a needle thread receiving section for fixing a needle thread together with the thread hooking rod 236 is provided inside a leading-end structure section 216 of the main body 210. As a result of driving of the thread hooking rod drive motor 240, the swayingly reciprocating mechanism section 230 reciprocally moves while swaying with respect to the main body 210. When a thread take-up lever pulls up the needle thread, a circular movement arm which performs rotation movement while hooking the needle thread adjusts a rotational angle of the circular movement arm, thereby enabling adjustment of a length of a needle thread in one preceding stitch.
D05B 21/00 - Machines à coudre avec dispositifs pour commander automatiquement le mouvement du porte-ouvrage en liaison avec le mécanisme de formation du point, afin d'obtenir un tracé particulier de couture, p. ex. avec commande à programme pour piquer les cols de chemises, pour poser les poches
D05C 7/02 - Machines à broder pour des travaux particuliers ou automatiques avec accessoires pour des types particuliers de broderie
D05C 7/00 - Machines à broder pour des travaux particuliers ou automatiques
D05B 19/08 - Dispositions pour introduire dans la mémoire les données concernant le point ou le modèle
D05B 19/12 - Machines à coudre commandées par programme comprenant une mémoire électronique ou une unité de commande par microprocesseur caractérisées par la commande du fonctionnement de la machine
D05B 47/04 - Dispositifs de commande automatique de tension du fil
In relation to a sewing machine having a function of rotating a sewing needle in order to prevent occurrence of hitch stitches, there is provided a needle bar that obviates a necessity for an additional rotation mechanism for rotating the sewing needle.
A needle bar includes: a needle bar body having a vertically-movable sleeve and a guide bush; a sleeve provided in the needle bar body and having openings, and the like, where balls are to be placed; a cam shaft that has a disc-shaped portion which is provided in the needle bar body, an upper shaft which is provided with a pair of grooves or the like having helical grooves and which is inserted in the sleeve, and a lower shaft which is formed so as to protrude downward from a guide bush; and a joint secured to the lower shaft for securing a sewing needle.
[Problem] Provided is a sewing machine, which does not require a board-shaped member to be superposed on the fabric that is to be embroidered and does not require dissolution of said board-shaped member, and with which the length of the needle thread can be adjusted for each stitch and fine-textured hollow embroidery can be obtained. [Solution] The presser foot (12c) of the sewing machine is provided with a main body (210), a swinging reciprocating mechanism (230), and a thread-hooking rod-driving motor (240). The swinging reciprocating mechanism (230) is provided with a thread-hooking rod (236). A needle thread-receiving section, which, together with the thread-hooking rod (236), fixes the needle thread, is provided inside the tip-configuring section (216) of the main body (210). By driving the thread-hooking rod-driving motor (240), the swinging reciprocating mechanism (230) swings and reciprocates with respect to the main body (210). When a balance (12a) draws the needle thread upward, it is possible to adjust the length of the needle thread of the one previous stich using a rotating arm (81), which is hooked to the needle thread and is rotated, by adjusting the upward rotation angle of the rotating arm (81).
D05C 11/00 - Dispositifs pour guider, entraîner, manutentionner ou traiter les fils sur les machines à broderAiguilles de machinesMécanismes de fonctionnement ou de commande à cet effet
D05C 7/00 - Machines à broder pour des travaux particuliers ou automatiques
To provide a sewing machine that can control tension on a needle thread and tension on a bobbin thread on a per-stitch basis; that enables even heads of a multi-head embroidery sewing machine to form an identical embroidery; and that enables even a plurality of sewing machines to form identical embroidery. A memory device stores for each stitch of embroidery data a needle thread control torque value and a bobbin thread control torque value. In a needle thread torque control zone, an upstream grip section main body is closed, and a downstream grip section main body is opened. A needle thread motor is subjected to torque control in accordance with the needle thread control torque value. In the meantime, in a position control zone, the upstream grip section body is opened, and the downstream grip section body is closed, thereby subjecting the needle thread motor to position control.
D05B 21/00 - Machines à coudre avec dispositifs pour commander automatiquement le mouvement du porte-ouvrage en liaison avec le mécanisme de formation du point, afin d'obtenir un tracé particulier de couture, p. ex. avec commande à programme pour piquer les cols de chemises, pour poser les poches
D05B 19/08 - Dispositions pour introduire dans la mémoire les données concernant le point ou le modèle
D05B 69/10 - Dispositifs électriques ou électromagnétiques
D05B 19/12 - Machines à coudre commandées par programme comprenant une mémoire électronique ou une unité de commande par microprocesseur caractérisées par la commande du fonctionnement de la machine
D05B 47/04 - Dispositifs de commande automatique de tension du fil
D05B 47/00 - Dispositifs de réglage de tension du fil d'aiguille pour machines à coudreAdaptations d'appareils de mesure de la tension des machines à coudre
D05B 69/00 - Entraînements ou dispositifs de commande pour machines à coudre
[Problem] To provide a needle bar and a sewing machine which has a function for rotating the sewing needle in order to prevent hitch stitches, the needle bar being configured so that the needle bar does not require an additional mechanism for rotating the sewing needle, so that the needle bar can be easily mounted and replaced, so that the needle bar allows the sewing needle to smoothly rotate, and so that the needle bar can be easily applied to existing sewing machines. [Solution] A needle bar (5) has: a needle bar body (10) having a vertically movable sleeve (12) and a guide bush (14); a sleeve (20) provided within the needle bar body (10) and having an opening (20a) or the like in which a sphere (22) is disposed; a cam shaft (30) having a circular plate-like section (32) which is provided within the needle bar body (10), an upper shaft (34) which is provided with a pair of groove sections (36a) or the like having helical groove sections and which is inserted into the sleeve (20), and a lower shaft (38) which is formed so as to protrude downward from the guide bush (14); and a joint (50) affixed to the lower shaft (38) and having a sewing needle (60) affixed thereto.
There is provided a needle thread tension controller that can control a magnitude of tension on a needle thread for each stitch, that can draw the needle thread with a slim chance of occurrence of a thread break, that easily, accurately detects occurrence of the thread break when the thread break has occurred, and that does not cause any excess or deficiency of a quantity of accumulated thread, which would otherwise be caused by drawing a needle thread. There are provided an upstream grip section 40 and a downstream grip section 60 for gripping a needle thread and a turning section 80 for turning the needle thread. In a torque control zone, rotating force is imparted to a turning arm in accordance with a torque value.
D05B 49/00 - Dispositifs releveur tendeur de fil d'aiguille des machines à coudre, p. ex. leviers
D05B 47/00 - Dispositifs de réglage de tension du fil d'aiguille pour machines à coudreAdaptations d'appareils de mesure de la tension des machines à coudre
[Problem] To provide a sewing machine that can control the tension on the upper thread and lower thread for each kind of stitch, and can form the same embroidery at each head of a multi-head embroidery machine or can form the same embroidery on multiple machines. [Solution] An upper thread control torque value and a lower thread control torque value are stored in a storage unit (92) for each kind of stitch of the embroidery data. In the upper thread torque control section, an upstream gripper body (1241) is closed, a downstream gripper body (1261) is opened, and the torque of an upper thread motor (1286) is controlled according to the upper thread control torque value. Meanwhile, in the position control section, the upstream gripper body (1241) is opened, the downstream gripper body (1261) is closed, and the position of the upper thread motor (1286) is controlled. With regard to the lower thread, in the lower thread torque control section, the lower thread motor (202) is controlled according to the lower thread control torque value.
D05B 47/04 - Dispositifs de commande automatique de tension du fil
D05B 19/12 - Machines à coudre commandées par programme comprenant une mémoire électronique ou une unité de commande par microprocesseur caractérisées par la commande du fonctionnement de la machine
Each of front-back direction actuation blocks for actuating a sewing frame in a front-back direction has ball screws, motors, and movable members. An engagement roller of each of the movable members engages with a long side of the sewing frame, and an engagement roller of each of the movable members engages with a long side. The movable members of respective front-back direction actuation blocks are connected to short sides of the sewing frame. In each of the front-back direction actuation blocks, the ball screw and the ball screw are joined together by means of a joint member. Movable members of respective right-left direction actuation blocks support the respective front-back direction actuation blocks.
D05B 21/00 - Machines à coudre avec dispositifs pour commander automatiquement le mouvement du porte-ouvrage en liaison avec le mécanisme de formation du point, afin d'obtenir un tracé particulier de couture, p. ex. avec commande à programme pour piquer les cols de chemises, pour poser les poches
D05B 39/00 - Supports de l'ouvrage pour machines à coudre
There is provided a sewing-machine bobbin thread tension controller capable of elaborately, accurately controlling bobbin thread tension without depending on frictional force. A bobbin thread tension controller includes an outer shuttle, a middle shuttle presser, a middle shuttle, a bobbin thread tension control mechanism, a shuttle actuation unit, and a bobbin. The middle shuttle has a magnet. A magnet is disposed, in close proximity to the magnet, on an arm attached to a rotary shaft of a shuttle actuation motor provided in the shuttle actuation unit. The middle shuttle is rotated by rotating the magnet by means of the motor. Further, a rotary disc is provided, in close proximity to the middle shuttle, on a rotary shaft of a bobbin thread tension control motor of the bobbin thread tension control mechanism and is provided with a magnet. A magnet is disposed on a part of the bobbin facing the rotary disc.
D05B 3/02 - Appareils ou machines à coudre possédant un mécanisme permettant le mouvement latéral de l'aiguille ou de l'ouvrage ou les deux combinés, pour faire des coutures ornementales d'après un tracé, pour les boutonnières, pour renforcer les ouvertures ou pour fixer certains articles, p. ex. boutons, par piquage avec des mécanismes assurant le mouvement de la barre à aiguille
D05B 19/00 - Machines à coudre commandées par programme
Disclosed is needle yarn tension control device that can control the amount of tension in a needle yarn for each stitch, can draw out the needle yarn, provides little risk of yarn breakages, readily and accurately detects any yarn breakages, and has no excess or insufficient amount of accumulated yarn from pulling out the needle yarn. Said needle yarn tension control device comprises an upstream grip (40) that grips the needle yarn, a downstream grip (60), and a rotating section (80) that rotates the needle yarn. In a torque control section, a balance (12a) applies rotational force to a rotating arm in accordance with a torque value such that tension is applied to the needle yarn against the direction that the needle yarn is pulled, while an upstream grip main body (41) is closed and a downstream grip main body (61) is open. In the position control section, the balance applies rotational force to the rotating arm (81) in accordance with position data for the angle of a needle yarn motor (86) such that the needle yarn motor angle returns to an initial position for the needle yarn motor (86) angle, while the upstream side grip main body (41) is open and the downstream side grip main body (61) is closed.
Disclosed is a drive device for a sewing machine sewing frame, with which distortion of the sewing frame is prevented and the sewing frame can be very accurately positioned. A longitudinal-direction drive unit (70) for driving a sewing frame (50) in the longitudinal direction comprises ball screws (86, 106), motors (84, 104) and mobile members (87, 107), and an engaging roller (92) of the mobile member (87) engages with a long-side part (52) of the sewing frame, while an engaging roller (112) of the mobile member (107) engages with a long-side part (54). The mobile members (87, 107) of a longitudinal-direction drive unit (71) are connected to short-side parts (56, 58) of the sewing frame (50). The ball screw (86) and the ball screw (106) of the longitudinal-direction drive units (70, 71) are linked by means of a linking member (124). A mobile member (137) of a lateral-direction drive unit (130) supports the longitudinal-direction drive unit (71).
A lower-thread tension control device for a sewing machine, capable of finely and accurately controlling the tension of a lower thread without relying on frictional force. A lower-thread tension control device for a sewing machine comprises an outer shuttle (110), a middle-shuttle presser (130), a middle shuttle (150), a lower-thread tension control mechanism (200), a shuttle driving section (250), and a bobbin (300). A magnet section (190) is provided to the middle shuttle (150). A magnet section (270) is provided close to the magnet section (190), to an arm (260) provided to the rotating shaft of a shuttle driving motor (252) of the shuttle driving section (250). The middle shuttle (150) is rotated by rotating the magnet section (270) by means of the motor (252). Also, a magnet section (214) is provided to a rotating disc (210) which is provided to the rotating shaft of a lower-thread tension controlling motor (202) of the lower-thread tension control mechanism (200) so as to be close to the middle shuttle (150). A magnet section is provided to a portion of the bobbin (300), said portion being located on the rotating disc (210) side, and the bobbin (300) is rotated by the motor (202).
D05B 59/00 - Adaptations de dispositifs de bobinage de la canette ou de changement de canette des machines à coudreDispositifs indicateurs ou de commande associés à ces dispositifs
09 - Appareils et instruments scientifiques et électriques
Produits et services
MEASURING APPARATUS AND INSTRUMENTS, NAMELY; ELECTRONIC ABSOLUTE POSITION SENSORS FOR DETECTING AND MEASURING ANGULAR AND LINEAR POSITION, DISPLACEMENT, VELOCITY, AND ACCELERATION, PARTS AND FITTINGS THEREOF, AND ROTARY AND LINEAR POSITION ENCODERS
