Janome Sewing Machine Company Limited

Janome Sewing Machine Industry Co., Ltd.

Mikio Inamori

Hideaki Takenoya

Susumu Hanyu

Yasukata Eguchi

Eiichi Shomura

Hachiro Makabe

Eiichi Syomura

A specific pattern for adjusting a fabric feeding amount in an electronic sewing machine with a storage for storing stitch control data for a plurality of different patterns. The specific pattern includes a 1st stitching group stored in the sewing machine and used for stitching the whole pattern in a reverse feed, a 2nd stitching group which coincide with the first one when a feed reference point is adjusted properly, and at least a 3rd stitching group which is stitched by a plurality of forward feeds and rearward feeds and is positioned in opposition to the 1st stitching group relative to a middle basic line, and gives to the 2nd stitching group accumulative errors of the forward feed and the rearward feed, so that a balance between the feeding amounts in a forward and a rearward directions of stitching is conformed.

Stitching patterns for adjusting feed amount in an electronic control

This invention relates to a computer controlled sewing machine, and more particularly to such a sewing machine which is incorporated therein with a plurality of feed adjusting switches for giving information to a micro-computer housed in the sewing machine, in order to correct irregularities of forward and backward feed amounts.

Computer controlled sewing machine

A hand stitching presser foot, for a zigzag sewing machine having a fabric feed direction and a presser foot holder, for forming a hem on a fabric, the presser foot consisting of a fabric presser member pivotally mounted to the presser foot holder and having one end, an elastic fabric presser portion and a cutout having an open edge extending in the fabric feed direction, the cutout forming a needle drop hole on an edge of the cutout opposite from the open edge, a fabric guide member disposed a distance from the presser foot holder, fixed to the fabric presser member at one end and adjacent to the open edge, the fabric guide member forming a fabric guide portion having a vertical face disposed substantially along the fabric feed direction for guiding the fabric in the fabric feed direction, and a thread guide member having a thread guide portion fixed to the fabric guide member and arranged so as to extend across the cutout in the region of the open edge, the elastic fabric presser portion being located between the thread guide portion of the thread guide member and the needle drop hole of the fabric presser member, and being formed so as to press against the fabric being sewn.

Hem stitching presser foot for a zigzag sewing machine

Intercharacter data for use in an electronic sewing machine is prepared by the steps of constituting each intercharacter control data with a first stitch control data group for determining relative position between a fabric and a character, a second stitch control data group utilized to form the character, and a third stitch control data group for determining a spacing between adjacent two characters; drawing a top segment .alpha. and a bottom segment .beta. respectively passing through top and bottom portions of the characters in parallel with the fabric feeding direction; and drawing a front segment X and a rear segment Y respectively passing through mostly projecting portions of the character on the front and rear sides thereof with respect to the fabric feeding direction in perpendicularly to the segments .alpha. and .beta.. Then the needle position of a first stitch point effected by the first stitch control data group comes to a position near the segment X and the area (Sh') of a front blank portion bounded by a segment X.sub.0 ' passing through the first stitch point in parallel with the segment X, the contour of a character to be stitched next, and the segments .alpha. and .beta. is substantially the same between any two adjacent characters. Moreover, the area (St') of a rear blank portion bounded by a segment Y.sub.0 ' passing through a last stitch point provided by the third stitch control data group in parallel with the segment Y, the contour of a previously stitched character and the segments .alpha. and .beta. are also substantially the same between any two adjacent characters.

Method of preparing intercharacter control data for use in sewing

A rotor shaft of a stepping motor is elastically held via cushions with respect to a housing of machinery, thereby to reduce disorders or noises to be caused in the stepping motor and exactly position an object to be adjusted.

Structure of supporting a stepping motor

A method of forming a stitch pattern is disclosed in which at least two closely spaced or coincident end stitches are present. The overall pattern is divided into overlapping block sections. In one block, a first group of stitches is formed followed by a second group of stitches being formed in an adjacent block. The number of stitches between closely spaced or coincident stitches that results is reduced. Therefore the accumulated error of fabric feeding pitches and the distance between the two end stitches is reduced resulting in a more precisely constructed overall pattern.

Method of making pattern data for a sewing machine

During stitching a pattern, there is often issued a designation to change the pattern under forming to the other. In such a case total load on a fabric feed control motor and a needle amplitude control motor is temporarily increased. A microcomputer which controls driving of these motors, discriminates the new designation and rotating phase of the sewing machine and drives the fabric feed control motor by means of specific data by mean value of the maximum and the minimum fabric feed control data, instead of the fabric feed control data which is first read out next to said designation. The control amount brought about by difference between said specific data and the fabric feed control data read out prior to said designation which controls as the final fabric feed before said designation, is caused to prevent the maximum available to the sewing machine so that the total load applied to the two motors are reduced when the maximum possible control is given to the needle amplitude control motor in succession to the load on the fabric feed control motor.

Stitch control method for an electronic sewing machine

In a stitch control process of the sewing machine which employs a microcomputer with an electronic memory storing stitch control signals and a needle position control motor and a fabric feed control motor, the microcomputer controls the needle position and the fabric feed control motors at certain rotation phases of the sewing machine. The microcomputer temporarily holds, during the operation of the sewing machine, the needle and feed control data and the feed control amount based on the feed control data which are read out in each phase and calculates the addition of the feed control amount and the needle control amount based on the needle control data which is read out at the following phase. If the calculating result is more than a predetermined value, the microcomputer employs the needle and feed control data read out at the preceding phase instead of the needle and feed control data read out at the following phase to control the feed and needle control motors with a total value of the needle and feed control amounts which is less than the predetermined value.

Stitch control method of electronic sewing machine

A method is disclosed for modifying a specific stitch or stitches of a given stitch pattern while the other parts of the pattern remain subject to the standard setting specific to the pattern.

Growing community of inventors

Tokyo, Japan

Mikio Inamori