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AssigneeJanome Sewing Machine Co., Ltd.
InventorsHideaki Takenoya, Kazuo Watanabe, Tamotsu Nakagawa, Yoshinobu Tonomura
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The tension of the sewing machine's upper thread is varied automatically, in a variety of ways not requiring conscious participation on the part of the user of the machine. When one of a set of selectable stitch-patterns is selected by the user, an appropriate thread-tension value is automatically established, although the user retains the ability to adjust the automatically established tension value if he wishes. When the user swings the presser-foot lever of the machine up, to raise the cloth presser foot up from the cloth, e.g., for basting work, the thread tension is automatically lowered to a predetermined value suitable for basting, although still adjustable by the user if he thinks necessary. Where a stitch-pattern is implemented using an addressable ROM, tension command data for each stitch of the stitch-pattern may be stored in the ROM, for variation of thread tension from constituent stitch of the pattern to the next. Alternatively, the ROM stores no tension control data per se, and instead a calculating circuit calculates, from the mere stitch-control data presented by the ROM, distance-dependent values dependent upon the distances between successive needle-penetration locations of the stitch-pattern, and from those derives appropriate tension command signals.
In a sewing machine of the type provided with pattern selector means operated by the user for implementing selected ones of a plurality of differently configured stitch-patterns, in combination, electromechanical thread-tension varying means operative for varying the tension of the thread fed to the sewing needle of the machine in response to a variable electrical tension command signal;
In a sewing machine provided with a user-operated presser-foot member moved by the user to a first setting to lift the cloth presser foot of the machine up out of engagement with sewn cloth and moved by the user to a second setting to lower the cloth presser foot of the machine down into engagement against sewn cloth, in combination, electromechanical thread-tension varying means operative for varying the tension of the thread fed to the sewing needle of the machine in response to a variable electrical tension command signal;
In a sewing machine of the type provided with a pattern memory consisting of addressable storage locations which store stitch-control data for at least one stitch-pattern, the pattern memory having stitch-control data outputs at which appear the stitch-control data contained in a memory storage location when that storage location is addressed, the storage locations furthermore storing tension-control data and the pattern memory additionally having tension-control data outputs at which appear the tension-control data contained in a memory storage location when that storage location is addressed, in combination, electromechanical thread-tension varying means operative for varying the tension of the thread fed to the sewing needle of the machine in response to a variable electrical tension command signal;
In a sewing machine as defined 14, furthermore including auxiliary user-operated selecting means operable by the user for altering the automatically selected values for the tension command signal when the user wishes to deviate from the automatically selected values.
In a sewing machine of the type provided with a pattern memory consisting of addressable storage locations which store stitch-control data for at least one stitch-pattern, the pattern memory having stitch-control data outputs at which appear the stitch-control data contained in a memory storage location when that storage location is addressed, in combination, electromechanical thread-tension varying means operative for varying the tension of the thread fed to the sewing needle of the machine in response to a variable electrical tension command signal;
In a sewing machine of the type provided with pattern selector means operated by the user for selecting differently configured stitch-patterns, in combination, electromechanical thread-tension varying means operative for varying the tension of the thread fed to the sewing needle of the machine in response to a variable electrical tension command signal;
Dependencies are inferred from the claim text.