Brother Kogyo Kabushiki-Kaisha

Hideo Kawaguchi

Hideo Ando

Yasuhiko Watanabe

Masaaki Yokoe

Kunihiko Murata

Etuzo Nomura

Kunio Haneda

A sewing machine including a needle bar to which a sewing needle is secured, a needle-bar drive motor which reciprocates the needle bar, a hook, a hook drive motor which rotates the hook, a speed detector which detects a rotation speed of the needle-bar drive motor, an information obtaining device which obtains information indicating that the rotation speed of the needle-bar drive motor will change, and a control device which controls, based on the detected rotation speed of the needle-bar drive motor and the obtained information, the hook drive motor so that the hook is rotated in synchronism with the reciprocation of the needle bar.

Sewing machine

An apparatus for processing embroidery data necessary for a sewing machine to form an embroidery in an area by filling the embroidery area with stitches, including a storing device storing outline data representing an outline of an embroidery area which outline includes a curved line portion, the outline data including curved line data defining the curved line portion, the curved line data including data indicative of a characteristic of the curved line portion, and a producing device producing the embroidery data by utilizing the outline data. The apparatus may further include a modifying device modifying the outline data and thereby transforming the outline. In this case, the producing device produces, by utilizing the modified outline data representing the transformed outline, embroidery data necessary to form an embroidery inside the transformed outline.

Embroidery data processing apparatus

An apparatus for folding a strip of material and supplying the same to a sewing machine which sewingly attach the folded strip of material (B) to a base material (C). The apparatus comprises a movable base (78) reciprocally movable between its standby position and its supply position, a strip of a material support member (87,88) mounted on the movable base (78) for receiving and supporting the strip of material (B) supplied when the movable base (78) is positioned at the standby position, and for transferring the strip of material (B) to the sewing machine bed (121) when the movable base (78) is positioned at the supply position, and a pair of folding plates (117,118) movable toward and away from the strip of material support member (87,88) in a first direction across the strip of material for bending the end poritons of the strip of material (B) into an L-shape, and in a second direction perpendicular to the first direction for bending the L-shaped end portions of the strip of material (B) into a U-shape.

Apparatus for folding a strip of material and supplying the same to a

A button sewing machine has a sewing needle reciprocatingly movable in response to rotation of a main shaft and a button gripping assembly having gripping portions for gripping and releasing a button and movable across the path of reciprocating travel of the sewing needle, the sewing needle and the button gripping assembly being operable together for sewing the button to a fabric. The button sewing machine includes a detector for detecting whether the button is gripped by the gripping portions. After it has been confirmed that the button is gripped by the gripping portions, the main shaft is driven by a control assembly for enabling the sewing needle to sew the button to the fabric.

Button sewing machine

The invention is concerned with a sewing apparatus having a sewing machine mounted on a work table, fabric workpiece clamping means capable of holding and releasing the fabric workpiece on the work table, and a feed driving mechanism for intermittently feeding the fabric workpiece clamping means, whereby machine sewing and fabric workpiece feed are repeated alternatingly thereby sewing buttons or forming buttonhole stitches to a plurality of sewing portions on the fabric workpiece. The sewing apparatus has auxiliary fabric workpiece clamping means operable independently of the fabric workpiece clamping means. In the case of processing of a long fabric workpiece, when the required amount of feed of the fabric workpiece exceeds the allowed stroke of the fabric workpiece clamping means between the feed start position and the maximum feed position, control means operate to allow the fabric workpiece clamping means to release the fabric work piece after the fabric workpiece is retained by the auxiliary fabric workpiece clamping means and to return towards the feed start position where the fabric workpiece clamping means again retain the fabric workpiece.

Apparatus for continuously forming stitches on a plurality of sewing

A fabric-guiding apparatus for guiding a fabric layer across a line of fabric feed along a side edge of the fabric layer, including a detector sensing the side edge of the fabric layer and generating a detection signal, a guiding wheel rotatable about an axis parallel to the line of fabric feed, a pressure exerting device for exerting a contact pressure urging the guiding wheel into engagement with the fabric layer, and a first drive motor to rotate the guiding wheel for laterally moving the side edge of the layer into position prior to a sewing cycle. The pressure exerting device comprises a pressure adjusting mechanism to adjust the contact pressure, a second drive motor to actuate the adjusting mechanism, a drive circuit responsive to command signals, a memory storing command data relating to the command signals, and a control circuit. The control circuit supplies to the drive circuit a certain number of the command signals for changing the contact pressure in predetermined increments prior to the sewing cycle, updating the memory upon every supply of the command signals to the drive circuit, outputs a rotation signal to operate the first drive motor when the command signals are supplied to the drive circuit, and checks according to the detection signal if the fabric layer has been moved into position by the guiding wheel, whereby an optimum level of the contact pressure is established between the guiding wheel and the surface of the fabric layer before the sewing cycle is initiated.

Growing community of inventors

Tajimi, Japan

Hideo Kawaguchi