Shima Seiki Manufacturing Limited

Shima Seiki Mfg., Ltd.

Hirokazu Nishitani

Toshiaki Morita

Yoshiyuki Komura

Masanori Inumaki

Takuya Miyai

Norio Kotaka

Masaki Minami

Hiroshi Minamide

Katsuji Minakata

Takeshi Okamuro

Mitsuo Kubo

A yarn feeding device for a knitting machine comprises a motor for driving a roller from which a yarn is fed out, and a rotatable arm which intermediately stores the yarn fed out from the roller, and the yarn is fed from the arm to a knitting machine body. A torque generator is provided to apply a variable torque to the arm. A yarn speed is obtained from a loop length of a stitch for each knitting needle and a knitting speed calculated on the basis of knitting data used in the knitting machine body. The yarn speed is converted into a torque to be applied to a buffer using a conversion table at each knitting section in a knitting course so as to correct a yarn tension fluctuation caused by the yarn speed, and the torque generator is controlled in accordance with the torque thus obtained. The yarn tension fluctuation is reduced so that high-speed knitting and knitting using a weak yarn can be facilitated.

Yarn feeding device and yarn feeding method for knitting machine

To provide an apparatus and a method for knitting fabric using elastic yarns, in which the elastic yarns are able to be used while correcting the difference between the set tension and the actual tension without being subject to a lowered knitting efficiency or restrictions to knitting patterns. In a knitting machine, a tension meterdetects the actual tension Tof a rubber yarnwhen a carriagereverses the running direction outside the knitting width of a fabric. The yarn sending length F at which the rubber yarnis sent out from a yarn sending device 8 to a yarn route pathway for each knitting course is able to be obtained in advance as the length of the rubber yarnconsumed under the designated tension Tfor each knitting course. The yarn sending length F is corrected in such a manner that the difference between natural lengths L, Lof the rubber yarn, existing in the yarn route pathway under the set tension Tand the actual tension T, decreases.

Apparatus and method for knitting fabric using elastic yarns

An object of at least one embodiment of the present invention is to stably feed a yarn by suppressing the effect of inertia in a buffer mechanism provided in a yarn feeding path. In at least one embodiment, a yarn feeder of the weft knitting machine feeds a knitting yarn from either of ends of a needle bed through a yarn feeding member to a knitting needle which carries out knitting motion based on knitting data while reciprocating the yarn feeding member in a longitudinal direction of the needle bed. A buffer rod is provided in the feeding path for the knitting yarn. Before the yarn feeding member starts to feed the knitting yarn to the knitting needle. a yarn feed controller carries out control to feed out the yarn to the buffer rod beforehand in a moving direction in which the feeding path is extended and to pull back the yarn stored in the buffer rod in a moving direction in which the feeding path is reduced. Thus, since an overshoot and an undershoot by the effect of inertia is caused by the buffer rod provided in the feeding path for the knitting yarn can be suppressed, the knitting yarn can be stably fed.

Yarn feeder of weft knitting machine

A knitting machine, a method of working yarn by the knitting machine, and a controller for working yarn by the knitting machine and its program. In the method, a carriage is controllably stopped at a point where a yarn passage length between a yarn working device and a knitting needle obtained by assuming that a buffer length on a tension arm is maximum matches a residual knitting length left before knitting at a point where yarn working is performed. When the carriage is stopped, the buffer length of a first arm is measured, a yarn is delivered from the yarn working device by an amount of difference between the buffer length and the maximum value thereof, and the yarn is worked in synchronism with the application of a tension to the yarn by releasing a second arm. Thus, the yarn can be worked at specified positions.

Knitting machine, yarn processing method of knitting machine, yarn processing control device of knitting machine and program thereof

A permanent magnet applies first sliding resistance in-between a holding arm and a guide rail. A carriage is provided with an electromagnet for magnetically applying second sliding resistance in-between the holding arm and the carriage. Although the holding arm persists in moving through inertia when the carriage stops movement, a sliding resistance that is the sum of the first sliding resistance and the second sliding resistance acts on the holding arm, and it is possible to promptly stop. Since the second sliding resistance does not act when the carriage brings the holding member, it is possible to reduce a load. When the carriage starts bringing the holding arm, a difference between the first sliding resistance and the second sliding resistance becomes the sliding resistance, and it is possible to decrease sliding resistance that acts when bringing is started, and reduce occurrence of an impact and a noise.

Apparatus for applying sliding resistance for weft knitting machine

A carriage which completes one course of knitting to the knitting end of a fabric is stopped. Knitting in a next course is performed when the carriage reverses its moving direction and re-starts its movement. Since the knitting yarn is not knitted to the fabric until a carrier brought by the carriage reaches a position of a knitting needle holding the stitch of the fabric at the knitting end, the knitting yarn existing in a feeding path between a yarn feeding mechanism and the carrier is excessively increased and a slack is generated. Since a distance between a yarn feeding port formed at a carrier's frontal end and the knitting needle at the fabric-knitting end is also reduced, the knitting yarn is further increased excessively. The further-excessively-increased knitting yarn is taken in by a yarn feeding means by reversing a servomotor, and further pulled in by a rewinding arm.

Yarn feeding apparatus of weft knitting machine

An object of the invention is to be provide a yarn feeding apparatus of a flat knitting machine capable of accurately predicting a required amount of a knitting yarn and knitting a fabric while supplying knitting yarn necessary for knitting. The knitting yarn is fed out based on an idea shown in a solid line in consideration of a yarn speed corresponding to the requirement for knitting yarn produced according to the movement of a yarn feeding member as shown by chain lines in FIG.(). A knitting yarn is stored on a buffer rod at a start of knitting because the speed of a motor such as a servo motor for feeding a knitting yarn lags behind the yarn speed. A knitting yarn that runs short at the time of deceleration at an end of knitting is also fed out in advance.

Yarn feeding device for flat knitting machine

A fluctuation in tension of a knitting yarn to be fed is reduced, and the knitting yarn having an accurate length is fed even if the amount of demand for the knitting yarn is suddenly changed. A knitting yarn is interposed between a main roller and a driven roller and is thus fed, and is supplied from a yarn feeding port to a fabric, with storage depending on an inclination of a buffer rod. A yarn feeding controller predicts the amount of demand for the knitting yarn based on a signal sent from a knitting controller and PID controls a servo motor such that a position of a tip portion of the buffer rod aims for a position of an origin according to the inclination angle of the buffer rod, which angle is detected by an inclination angle sensor.

Yarn feeding apparatus

In a flat knitting machine wherein a plurality of knitting locks work on a single needle bed to knit, the consumption of each yarn is measured and compared with the standard yarn length, and the stitch cam adjustment values of the respective knitting locks are corrected. The stitch cam adjustment data is stored for the respective combinations of stitch cams and yarns. Correction is not limited to the stitch cam which knitted the yarn of which consumption was measured. Correction by the same value is also given to the stitch cam adjustment values of other stitch cams relative to the yarn. As a result, for any combination of a stitch cam and a yarn which appears suddenly in the latter half of knitting, the stitch cam adjustment values have been corrected on the basis of the measurement of consumed yarn lengths of other stitch cams, generating no knitting gaps.

Yarn length control system for a flat knitting machine

In order to process yarn preliminarily, and to change over yarn precisely at a desired knitting position, the yarn fed to a flat knitting machine is processed by a yarn processing device. To change over the yarn at a changeover position of knitted fabric, it is necessary to actuate the yarn processing device preliminarily at an actuating position C. A controller calculates the actuating position from a set value in a setting circuit and pattern information from a memory. When an encoder detects that a position of feeding the yarn to a knitting needle has reached the actuating position, the yarn processing device is actuated. The length of the yarn from a yarn processing position to the actuating position is nearly equal to the sum of a knitting loop length from the actuating position to the changeover position.

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Wakayama, Japan

Hirokazu Nishitani