Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki

Satomi Yamauchi

Hiroshi Kumatani

Hiroshi Yamada

Hisaaki Tsukahara

Takashi Nakamura

Takanobu Fujimoto

Osamu Gouta

Yoshinori Abe

Yoshifumi Nishizawa

Nobuhiro Mikami

Takayuki Wakana

Masakatsu Daijo

Hiroshi Honda

Yutaka Yamaura

A sewing machine having a motor drive operating in response to a controller to rotate in forward and reverse rotation directions. A jogging angle may be set and the drive operated automatically for rotation in forward and/or reverse directions as a function of various operating conditions so that the needle is stopped in an optimum position for piercing a material.

Apparatus and method for controlling sewing machine

A drive control apparatus for a driven machine is designed to easily check which of a plurality of parameters indicating the control characteristics of the driven machine have been changed from their factory-set initial values. Initial parameter values are stored in a list in a first memory and current parameter values are stored in a second memory. When a display request is given, the initial values of parameters stored in the first list in a control section are compared to the current values of the parameters stored in nonvolatile memory. The identity of the parameters that have been changed from their initial values are displayed on a liquid crystal display. Also, the stored initial value list is displayed.

Drive control apparatus for driven machine and parameter display method

A detector is provided for a sewing machine wherein light transmitting/shielding discs are mounted coaxially on a shaft of the sewing machine and sandwiched between light receiving and light transmitting optical fibers positioned along opposite side portions of the disc assembly and leading to a processing module section. The detector is able to detect a plurality of positional settings of the sewing machine as well as additional settings without imposing undue stress on the light transmitting optical fibers since the optical fibers remain linear. A power indicating light, connected to the processing module section via an optical fiber, ensures that there is minimal electrical interference with the operation of the detector.

Fiber optic detector and power indicator for a sewing machine

A sewing machine control device for controlling the drive of a sewing machine. The sewing machine control device is provided with a monitoring device having a display device for displaying data to identify the direction of rotation and abnormal conditions of the sewing machine.

Sewing machine control device

A sewing control system for controlling the speed of rotation of a sewing machine in which in a first embodiment, a rotation transfer ratio operation is inhibited during the time that slip occurs. According to a second embodiment, the rotation transfer operation is initiated only when the number of revolutions of the motor shaft is higher than a predetermined value. In a third embodiment, slip is prevented by not outputting a speed instruction which is not steeper than a predetermined gradient. In a fourth embodiment, when an abnormal condition is detected, the rotation transfer ratio is reduced in order to reduce the speed of the motor, thereby assuring the safety of an operator.

Method and apparatus for controlling a sewing machine

Controller for a sewing machine

In a motor control apparatus and a motor controlling method, when a connector is disconnected while an operation signal is ON, an excitation current component signal becomes zero and does not reach a predetermined value even after a predetermined period of time. In this case, a current component signal discriminating circuit discriminates that an amplitude of the excitation current component signal is equal to or less than the predetermined value, a timer issues an alarm signal because the predetermined period has passed from input of the operation signal, and a stop circuit stops operation of an inverter upon reception of the alarm signal, so that the inverter is prevented from breakdown.

Motor control apparatus and motor controlling method

A motor control apparatus for a sewing machine includes an adjustable speed setter for generating a speed set signal. A first memory stores a plurality of reference values each defining a reference region into which the speed set signal can fall. A second memory stores speed setpoint values corresponding to the reference regions. A central processing unit selects one of the reference regions by comparing the speed set signal with the reference values and selects the corresponding speed setpoint value from the second memory. A motor is controlled to run at the selected speed setpoint value.

Growing community of inventors

Aichi, Japan

Satomi Yamauchi