Abstract: A driving apparatus which is capable of smoothly moving a follower by a cam portion, and realizes the stopper structure of the follower by a small number of components without the size increased. The driving apparatus comprises an up cam gear having an up radial cam and an up thrust cam, and a down cam gear unit having a down radial cam and a down thrust cam. The up cam gear and the down cam gear unit mesh with each other in a vicinity of a region in which a lift amount of the up radial cam with respect to the follower increases. In a vicinity of a position at which the up cam gear and the down cam gear unit mesh with each other, a lift amount of the up thrust cam is larger than a lift amount of the down thrust cam in the thrust direction.

Abstract: A sewing machine includes a needle bar, a needle bar up-and-down movement mechanism, a swinging mechanism, a lower shaft, an outer shuttle, a thread cutting mechanism, a rotation speed adjustment mechanism, and an actuator. The needle bar up-and-down movement mechanism is configured to move the needle bar up and down. The swinging mechanism is configured to swing the needle bar in a left-right direction. The lower shaft is configured to rotate in synchronization with up-down movement of the needle bar. The outer shuttle is configured to rotate along with rotation of the lower shaft. The thread cutting mechanism is configured to cut at least an upper thread. The rotation speed adjustment mechanism is configured to adjust a rotation speed of the outer shuttle. The actuator is a driving source of the thread cutting mechanism and the rotation speed adjustment mechanism.

Abstract: An improved structure high speed zigzag stitch industrial-use sewing machine in which a vertically extending columnar elevated material feed needle plate platform (Post Bed) structure is disposed below the needle holder of the sewing machine. The drive mechanism of the revolving shuttle and the material feed dog plate are situated in the interior section of the elevated material feed needle plate platform, with changes in the type of stitches sewn by the sewing machine governed by a pattern cam. As such, the elevated material feed needle plate platform (Post Bed) structure provides for wider applications than conventional level platform-type material feed needle plates which are incapable of easily sewing across concave, convex, and other irregular contours of objects being processed.

Abstract: An improved structure high speed zigzag stitch industrial-use sewing machine in which a vertically extending columnar elevated material feed needle plate platform (Post Bed) structure is disposed below the needle holder of the sewing machine. The drive mechanism of the revolving shuttle and the material feed dog plate are situated in the interior section of the elevated material feed needle plate platform, with changes in the type of stitches sewn by the sewing machine governed by a pattern cam. As such, the elevated material feed needle plate platform (Post Bed) structure provides for wider applications than conventional level platform-type material feed needle plates which are incapable of easily sewing across concave, convex, and other irregular contours of objects being processed.

Abstract: A sewing machine has a needle bar up/down moving mechanism, a needle bar oscillating mechanism, a needle bar interrupting mechanism, a thread tension adjusting mechanism, and a thread tension releasing mechanism. The sewing machine further includes a driving mechanism that transmits a driving force of an electric motor to the needle bar oscillating mechanism, the needle bar interrupting mechanism and the thread tension releasing mechanism. The driving mechanism comprises a first cam and a second cam which are driven by the electric motor. The first cam has an oscillating cam face that controls the needle bar oscillating mechanism and an interrupting cam face that controls the needle bar interrupting mechanism. The second cam has a releasing cam face that controls a thread tension releasing mechanism. Therefore, the needle bar oscillating mechanism, the needle bar interrupting mechanism and the thread tension releasing mechanism can be driven by a common electric motor.

Abstract: A zig-zag sewing machine includes a needle swinging cam provided on a cam shaft to which the rotational movement of a drive shaft is to be transmitted, and a needle bar support member provided on a slide shaft to which a swinging motion due to its engagement with the needle swinging cam is to be transmitted, while the needle swinging cam includes a cam groove and a positioning hole respectively formed in the side surface thereof. Also, on the side surface of a cam receive member provided on a cam shaft for fixing the needle swinging cam, there is provided a positioning pin which can be fitted into the positioning hole. Further, on the side surface of a cam arm which generates a swinging motion to be transmitted to the slide shaft, there is provided an engaging pin which can be engaged into the cam groove.

Abstract: A pattern generator for use in a zig-zag sewing machine wherein a needle bar is moved back and forth in an oscillatory movement to produce zig-zag action as a consequence of rotation of an arm shaft. The shaft rotates at a constant angular velocity with the period of time required for one cycle of oscillatory movement of the needle bar being equal to the period of time for two successive complete revolutions of the shaft. The generator includes a rotatable cam connected to the shaft to rotate the cam at the same velocity as the arm. A slide block follower engages the cam. The block has raised, intermediate and lowered positions in the cam and moves smoothly between these positions as the cam is rotated.

Abstract: In a sewing machine, an oscillating cradle has two bearings in which a needle bar is slidingly mounted. An external surface of each bearing has a spherical profile by which it is pivotingly engaged in a respective seat of complementary shape provided in a first arm of the cradle, for an upper bearing, and in a second arm, for a lower bearing. A resilient leaf spring, in the form of a U, exerts an axial pressure on both the upper bearing and the lower bearing, to maintain them in their seats in alignment with one another.

Abstract: The lateral displacement or oscillation of a sewing machine needle bar is controlled by a permanently installed servomotor-driven cam operated in coordination with a second similarly installed servomotor-driven cam controlling the displacement of the fabric feed dog. Manipulation of the faces on the two cams, in a synchronized manner, allows numerous stitch patterns to be achieved according to the amplitude and direction of displacement of the needle bar and feed dog pursuant to the positioning of the faces on the two cams by their respective servomotors.

Abstract: An electronic control sewing machine for producing stitching patterns by storing as programs in a memory the pattern signals for the amount of needle bar amplitude and the amount of fabric feed, includes control motors having output shafts which have rotational outputs and are driven in response to the pattern signals per rotation of the sewing machine. The machine further includes pawl members having pawls, and cam bodies positioned on the output shafts of the control motors and each including a plurality of cam faces. The pawl members and the pawls are switched to different ones of the plurality of cam faces by the control motors in accordance with the programs stored in the memory of the sewing machine.

Abstract: An angularly configured bracket is mounted at one end portion for pivotal adjustment in a sewing machine into a position of engagement at another end portion with fixed machine structure. A fastener extending through a slot in the bracket while the bracket is so adjusted secures the bracket to the upper end of a fixed post having a rotatable work feed controlling cam thereon, and so stabilizes the post against distortion by a spring biased cam engaging follower.