US 4,727,817 A · Buttonhole sewing machine

Abstract

Disclosed is a button-hole sewing machine which includes an electric motor for driving the sewing machine; a machine body including a bed for holding a workpiece in cooperation with a piece clamping means; a stitch forming device for working button-holes in the work piece and including mechanism for driving a needle bar which supports a needle, a looper-spreader mechanism for driving a looper and a spreader, and a turning mechanism for turning the needle bar, the looper and the spreader. The needle bar driving mechanism includes a vertical reciprocation mechanism and a needle lateral and an arm shaft for driving the up/down moving mechanism. The machine further includes a bed shaft for driving the looper-spreader mechanism; a cutting mechanism for forming button-holes in the work; a control cam mechanism including a rapid feed mechanism for rapidly feeding the bed and a stitch feeding mechanism; a vertical shaft linked with the arm shaft for driving the needle vibrating mechanism, the lower shaft, and the stitch feeding mechanism; and a clutch means for transmitting torque of the motor to a rapid feed shaft to rapidly feed the bed through the rapid feeding mechanism in a rapid feeding mode and for transmitting the torque to one of the arm, vertical, and bed shafts to cause the stitch forming device to perform stitch forming through the stitch feeding mechanism. The motor is directly mounted on the machine body for portability.

Claims14

Dependent claims

A buttonhole sewing machine for sewing buttonholes in a workpiece comprising:

a machine body including a bed stand, a bed and an arm, said bed and said arm being fixed to said bed stand;
a motor mounted on said machine body;
an arm shaft mounted in arm;
a stitch forming device, for stitching the buttonholes, comprising:
a needle bar for supporting a needle;
a needle;
needle reciprocating drive means for driving said needle bar with vertically reciprocating motion;
vibrating means for laterally vibrating said needle bar;
and
a looper and spreader and a bed shaft for driving said looper and spreader;
and
workpiece clamping means slidably mounted on said bed, for moving the workpiece across the path of the needle;
a stitch feeding mechanism;
a camming mechanism for driving said work clamp carrier;
a vertical shaft operatively connected to said arm shaft, said bed shaft and said camming mechanism;
and
a clutch for transmitting torque from said said motor to said camming mechanism to drive said work clamp carrier in a rapid feed mode and for transmitting the torque from said motor, through at least one of said arm, vertical and bed shafts, to drive said stitch forming device in a stitch feeding mode.

14 more elements

A buttonhole sewing machine for sewing buttonholes in a workpiece comprising:

a machine body including a bed, a bed stand and an arm;
an electric motor mounted on said machine body for driving said sewing machine;
an arm shaft mounted in said arm and driven by said motor;
workpiece clamping means for slidably mounted on said bed for moving the workpiece across the path of the needle;
a stitch forming device for stitching buttonholes in the workpiece, said stitch forming device comprising:
a needle bar for supporting a needle;
needle reciprocating drive means for driving said needle bar with vertically reciprocating motion;
vibrating means for laterally vibrating said needle bar;
a looper and spreader and a bed shaft for driving said looper and spreader;
a turning mechanism for turning said needle bar, said looper and said spreader;
a vertical shaft operatively connected to said arm shaft and to said bed shaft;
a stitch feeding mechanism, driven by said vertical shaft;
a rapid feed mechanism;
a camming mechanism driven by said stitch feeding mechanism, in a stitch feeding mode and by said rapid feed mechanism, in a rapid feed mode, to drive said work clamp carrier;
a clutch for selectively transmitting the torque of said motor either to an intermediate shaft to drive said rapid feed mechanism, in a rapid feed mode, or to one of said arm, vertical and bed shafts, to effect stitch forming, in a stitch feeding mode;
and
intermittent brake means for braking said camming mechanism when the needle is engaged with the workpiece and for releasing the camming mechanism for stitch feeding.

14 more elements

Dependencies are inferred from the claim text.

Buttonhole sewing machine

Life of this patent

Buttonhole sewing machine

Life of this patent

Abstract

Claims14