Tsudakoma Corp.

Tsudakoma Kogyo Kabushiki Kaisha

Tsudakowa Corp.

Yujiro Takegawa

Fumio Matsuda

Souichi Nakai

Zenji Tamura

Kanji Tsuji

Mitsunobu Futakuchi

Kenjiro Ohno

Nobuhisa Shu

A method of knitting a single knit fabric comprising the steps of successively advancing a plurality of needles corresponding to a non-knitting section within which a yarn from a yarn feeder forms a transit yarn portion beginning with a needle on the side of a starting point of the transit yarn portion to lower the yarn from the yarn feeder below the needles, and engaging the yarn from the yarn feeder by another needle on the side of the yarn feeder closer to the yarn feeder than the advanced needles.

Method of lowering the yarn height for knitting single knit fabric

The sinker actuating apparatus has a sinker actuator which is displaced on a needle bed so as to move a movable sinker to a pressing or releasing position. A connector for connecting the actuator is non-fixedly provided to a needle moving device so that the actuator is moved in response to the movement of the needle mover. First and second stopper are provided for restricting the advanced or retracted positions of the sinker actuator. A resilient member is arranged to give an advancing force to the actuator.

Sinker actuating apparatus having spring force advancing member

When a weft yarn is broken between a fixed drum type weft yarn measuring and storing device and a picking nozzle, the weft yarn extending to a winding yarn guide is reliably delivered to a yarn suction device by the steps of generating an air current inside the winding yarn guide in the picking direction, generating an air current inside the yarn suction device in the drawing direction while the winding yarn guide is aligned with the yarn suction device disposed in front of the weft yarn measuring and storing device, and keeping a retaining pin from being advanced toward the drum. Thereafter the broken weft yarn on the drum is discharged by retracting the retaining pin.

Method of discharging a weft yarn wound around a drum

In a shuttleless loom, a warp sheet is moved from a space that is necessary for maintenance and inspection of a reed. An arranging bar is provided over the warp sheet between a shedding frame and a cloth fell so as to be vertically movable. When the arranging bar is lowered at the time of maintenance and inspection of the reed, the warp sheet can be moved to the lower side of the reed.

Reed maintenance device with warp sheet repositioner

Air is jetted into the reed groove of a modified reed in a manner equivalent to that in which air is jetted in practical weaving operation, air-speed is measured at a plurality of measuring points in the reed groove on each of a plurality of planes perpendicular to the longitudinal direction of the modified reed, a maximum air-speed among air-speeds at the measuring points in each plane is determined, and the positions of the measuring points respectively corresponding to the maximum air-speeds are provided in a visually recognizable state.

Method of measuring air-speed in a reed groove

A mispicked weft removing method keeps a mispicked weft continuous with a weft remaining in the main picking nozzle of the loom, and inserts the weft additionally in the shed so that the weft extends in a loop in the shed, and then places a yarn guide in the loop of the weft, and pulls the weft toward the picking side. Since the mispicked weft is pulled via the yarn guide toward the picking side of the loom, a pulling force applied to the weft to remove the mispicked weft from the shed is effectively available for separating the mispicked weft from the cloth fell.

Mispicked weft removing method

A positive feed picking device for a fluid jet loom includes a yarn measuring and storing device; a main picking nozzle; a positive feed mechanism including a drive roller and a motor for driving the drive roller. The positive feed mechanism is disposed between the yarn measuring and storing device and the main picking nozzle to feed a weft yarn positively to the main picking nozzle during a picking period. The feed picking device also includes a sensor disposed on a yarn path along which the weft yarn travels for detecting the delivery of a predetermined length of the weft yarn from the yarn measuring and storing device. A motor controller for controlling the operating speed of the motor of the positive feed mechanism, and a controller for controlling the positive feed mechanism are also included in the positive feed picking device. The controller starts the positive feed mechanism at the start of picking period. The motor controller controls the motor so that the rotating speed of the motor varies according to a predetermined speed control characteristic.

Positive feed picking device for a fluid jet loom

A warp mending operation control method includes the steps of: dividing a warp line in a loom into a plurality of sections each corresponding to a respective one of a plurality of warp mending devices; storing operation programs for controlling the respective warp mending devices corresponding to the plurality of sections and detecting the section where the warp line is broken; and driving the warp mending device which has been positioned in the section in which a broken warp line has been detected after reading the operation program corresponding to that section. A warp mending operation control apparatus includes: a memory for storing operation programs for controlling warp mending devices each positioned in corresponding sections provided by dividing a warp line in a loom, the mending devices for mending a broken warp line having leading and trailing edges; a suction nozzle with a yarn sensor which is movable to both the leading and trailing edges of the broken warp line in both the width direction of the loom and the direction of the warp upon reception of a warp stop signal issued by a warp stop motion; a breakage section judging unit for judging a breakage section where the warp line is broken upon reception of a detected signal issued by the yarn sensor and a selection control unit for reading the operation programs corresponding to the thus judged breakage section out of the memory and for driving the warp mending device positioned at the breakage section.

On loom warp mending operation

A method of locating a slit between the dents of the reed of a loom corresponding to a broken warp and to an apparatus for positioning a threading device at a position corresponding to the slit between the dents corresponding to the broken warp. The broken warp or a normal warp in a specific vertically displaced relation with the broken warp is detected by a yarn sensor. The position of a slit between the dents corresponding to the broken warp or that of the normal warp is determined on the basis of the distance traveled by the yarn sensor from its standby position, and a threading device is position corresponding to the slit between the dents corresponding to the broken warp on the basis of the distance traveled by the yarn sensor.

Location of a slit between dents corresponding to a broken warp

When a warp is broken during weaving on a loom, the broken warp is mended and restored by a method of restoring a broken warp after mending the same, comprising steps of connecting a mending yarn to the trailing portion of the broken warp to form a mended warp; cutting a normal warp which has been drawn through the same slit between dents as the broken warp is to be drawn through and inserting a mending yarn with a sufficient length between the cut ends of the normal warp, tying the mending yarn connected to the trailing portion of the broken warp to the normal warp drawn through the same slit between the dents as the broken warp is to be drawn through; and pulling the normal warp toward the take-up side so that the mended warp and the normal warp are tightened properly. Thus, the mended warp is drawn through the slit between the dents together with the normal warp.

Method of restoring a broken warp after mending the same

A method and apparatus for automatically mending warp yarn selects broken warp yarns from among a group of the warp yarns at the time of breakage of the warp yarn. The spacings between the reed wires of a reed through which the broken warp yarn is passed or the spacings between the adjoining reed wires are then enlarged. A yarn passing member is then positioned at the reed wires through which the broken warp yarn is passed on the basis of the position of the reed wires having large spacings therebetween. The yarn passing member is then inserted into space of the reed wires through which the broken warp yarn is passed. A mending yarn tied to the broken warp yarn is then passed and guided into corresponding reed wires by the yarn passing member. In such a manner, it is possible to then set the loom to be re-started.

On loom system for mending broken warp yarn

A weft yarn extracting device for extracting a weft yarn faultily inserted in a cloth fell includes an extracting unit including a pair of fingers, a first shifting unit for shifting the extracting unit between a standby position and an operating position, and a second shifting unit for turning the extracting unit about an axis. In operation, one end of the weft yarn is sucked in the extracting unit by the agency of an air current and is gripped by gripping members. Then, the gripping members are rotated to extract the weft yarn by winding the weft yarn around the gripping members, while the extracting unit is turned about an axis by the second shifting unit to separate the weft yarn from the cloth fell.

Pick extracting device with rotative drive

A picking period setting device for a loom to decide an appropriate picking period for satisfactory picking operations. A shedding curve calculating circuit is used which calculates shedding curves representing the shedding motion of heddle frames. A shedding stroke calculating circuit calculates a set of desired shedding stroke curves. An appropriate picking period deciding circuit decides a precise picking period defined by the crank angles of the loom on the basis of the result of comparison of the shedding curves and the desired shedding stroke curves. Thus, the weaving operation of the loom is continued without interruptions caused by faulty picking.

Picking period setting device for a loom

A seersucker loom is arranged such that puckering warp yarns are divided to form a shed during the weaving of a seersucker. The tension of the puckering warp yarns is maintained on a level below that of the tension of the ground warp yarns. The puckering warp yarns are slackened positively at least during a slackening period from a shed closing operation to a beating-up operating of every turn of the main shaft of the seersucker loom so that the tension of the puckering warp yarns are reduced to a value which below a predetermined tension of the yarns during a period other than during the slackening period. This enables the loom to slacken portions of the puckering warp yarns near the cloth fell sufficiently during the beating-up operation so that the puckering warp yarns are satisfactorily puckered.

Seersucker loom with tension regulation of puckering warp

An automatic picking controlling method for automatically controlling the operation of at least the subnozzle groups in a jetting pattern selected on the basis of the actual running mode of a picked weft yarn is arranged such that a plurality of typical jetting patterns respectively corresponding to different running modes of the picked weft yarn for controlling at least the subnozzle groups are initially stored in a storage unit; the running mode of the picked weft yarn is detected in a detection step; a jetting pattern meeting the actual running mode selected from among those stored in the storage unit is read, and the operation of the subnozzle groups is controlled in accordance with the selected jetting pattern for a predetermined period of time.

Growing community of inventors

Ishikawa, Japan

Yujiro Takegawa