A yarn feed system, for control of the feeding of one or more yarns to the needles of a tufting machine, which can be manufactured as a substantially standardized unit or attachment removably mounted to a tufting machine includes a series of yarn feed devices each having a drive motor with a replaceable yarn feed roll drive system mounted thereto. Each yarn feed roll drive system can include a set or series of yarn feed rolls mounted within a housing and having a series of gear teeth formed thereabout, with the gear teeth of the yarn feed rolls engaged in an intermeshing arrangement so that as one of the yarn feed rolls is driven by the drive motor, the other yarn feed rolls likewise are actively driven thereby. Each of the yarn feed rolls further will include a textured roll surface that can provide for enhanced grip and control of the feeding of the yarns which are extended thereabout to the needles of the tufting machine in accordance with a tufted pattern being formed.

A yarn feed system, for control of the feeding of one or more yarns to the needles of a tufting machine, which can be manufactured as a substantially standardized unit or attachment removably mounted to a tufting machine includes a series of yarn feed devices each having a drive motor with a replaceable yarn feed roll drive system mounted thereto. Each yarn feed roll drive system can include a set or series of yarn feed rolls mounted within a housing and having a series of gear teeth formed thereabout, with the gear teeth of the yarn feed rolls engaged in an intermeshing arrangement so that as one of the yarn feed rolls is driven by the drive motor, the other yarn feed rolls likewise are actively driven thereby. Each of the yarn feed rolls further will include a textured roll surface that can provide for enhanced grip and control of the feeding of the yarns which are extended thereabout to the needles of the tufting machine in accordance with a tufted pattern being formed.

A sewing machine includes a needle plate, a feed dog configured to move a workpiece, a vertical drive mechanism configured to vertically drive the feed dog, a switch mechanism, a cutting mechanism, and an actuator. The switch mechanism is configured to switch from an active state where the feed dog is driven, by the vertical drive mechanism, above and below an upper surface of the needle plate to an inactive state where an upper surface of the feed dog is maintained below the upper surface of the needle plate. The cutting mechanism includes a blade configured to cut a thread at a position below the needle plate. The actuator is configured to commonly drive the switch mechanism and the cutting mechanism.

A sewing machine includes a sewing portion, a movement portion, a processor and a memory. The memory is configured to store computer-readable instructions that, when executed by the processor, instruct the processor to perform processes. The processes include acquiring pattern data indicating positions of a plurality of needle drop points to sew a pattern, acquiring a position of a sewing start point of the pattern, performing first correction, performing second correction that uses the acquired position of the sewing start point as a base point, and corrects the pattern data, by changing, by an acquired change amount, the positions of the plurality of needle drop points represented by the pattern data corrected by the first correction, and controlling the sewing portion and the movement portion and sewing the pattern on the sewing object, in accordance with the pattern data corrected by the second correction.

A sewing machine includes a sewing portion, a movement portion, a processor and a memory. The memory is configured to store computer-readable instructions that, when executed by the processor, instruct the processor to perform processes. The processes include acquiring pattern data indicating positions of a plurality of needle drop points to sew a pattern, acquiring a position of a sewing start point of the pattern, performing first correction, performing second correction that uses the acquired position of the sewing start point as a base point, and corrects the pattern data, by changing, by an acquired change amount, the positions of the plurality of needle drop points represented by the pattern data corrected by the first correction, and controlling the sewing portion and the movement portion and sewing the pattern on the sewing object, in accordance with the pattern data corrected by the second correction.

A shift mechanism for a tufting machine for controlling the transverse, lateral shifting movement of a series of needles of the tufting machine across a backing material for forming a series of cut and/or loop pile tufts of yarns in the backing in accordance with a pattern. The shift mechanism will include a motor controlled rack and pinion shift control assembly having one or more pinions, each driven by a motor, that engage and drive a rack coupled to at least one needle bar of the tufting machine, for controlling the transverse shifting movement of the needles.

A shift mechanism for a tufting machine for controlling the transverse, lateral shifting movement of a series of needles of the tufting machine across a backing material for forming a series of cut and/or loop pile tufts of yarns in the backing in accordance with a pattern. The shift mechanism will include a motor controlled rack and pinion shift control assembly having one or more pinions, each driven by a motor, that engage and drive a rack coupled to at least one needle bar of the tufting machine, for controlling the transverse shifting movement of the needles.

A sewing machine includes a movement mechanism, a swinging mechanism, a presser device, a guide portion, a processor, and a memory configured to store computer-readable instructions that, when executed by the processor, instruct the processor to perform processes. The processes include acquiring pattern data used for sewing a couching pattern in which a plurality of motifs are continuously arranged. The motif is configured in a predetermined shape by a plurality of stitches including a main stitch and a sub-stitch. The processes include correcting at least one selected from the group of a start point position and an end point position of the main stitch of one of the motifs, such that the length of the main stitch of the one motif is longer in a second case than in a first case, and driving the movement mechanism and the swinging mechanism in accordance with the corrected pattern data.

A sewing machine includes a movement mechanism, a swinging mechanism, a presser device, a guide portion, a processor, and a memory configured to store computer-readable instructions that, when executed by the processor, instruct the processor to perform processes. The processes include acquiring pattern data used for sewing a couching pattern in which a plurality of motifs are continuously arranged. The motif is configured in a predetermined shape by a plurality of stitches including a main stitch and a sub-stitch. The processes include correcting at least one selected from the group of a start point position and an end point position of the main stitch of one of the motifs, such that the length of the main stitch of the one motif is longer in a second case than in a first case, and driving the movement mechanism and the swinging mechanism in accordance with the corrected pattern data.

A magnetic encoder system (2) of a sewing machine drive comprises a disk (5), which is magnetized, an incremental track (8) and a reference track (9). The incremental track (8) extends completely around the disk (5) and has alternating pole elements (10), which serve as incremental markings. The reference track (9) is designed as a ring-shaped section on the disk (5) and has a monopole (11). The result is a magnetic encoder system (2), for example for a servo motor of a sewing machine.