Abstract: A feeding device of an industrial sewing machine comprises a shell base, a main connecting rack having a first bar portion and a second bar portion, a terminal driven rack mounted at the first bar portion and the second bar portion, a first driven rack, a raising-driven mechanism and a driving shaft. The first driven rack is mounted at the first bar portion and connected to the shell base, and has a first sliding recess. The raising-driven mechanism has a second driven rack mounted at the second bar portion and having a second sliding recess. A raising-connecting rod is mounted at the second driven rack and the terminal driven rack. The driving shaft has a first crank mounted through the first sliding recess and a second crank mounted through the second sliding recess. The feeding device has a compact volume to facilitate ease in maintenance.

Abstract: A cloth pressing device of a sewing machine has a presser leg and a presser foot. The presser leg is a hollow cylinder and has a combining portion and a sleeve portion. The sleeve portion is integrated with a bottom portion of the combining portion. The presser foot is mounted around and fixed with a bottom portion of the presser leg. The presser foot has a surrounding portion and a pressing portion. The surrounding portion is a U-shaped block and has a front end and two free ends. The pressing portion is formed at the front end of the surrounding portion.

Abstract: A pivot bearing mechanism includes a main body and a pivot shaft. The main body is fixedly mounted on a first member, and is provided on a top thereof with an axially extended slit and near the top with an internally threaded hole transversely extended through the slit, such that a screwing element can be tightened into the threaded hole to narrow the slit. The pivot shaft has a first end rotatably supported on the main body and a second end fixedly connected to a second member. By tightening the screwing element into the threaded hole by different degrees, the slit is forced to narrow or widen to allow adjustment of a tightness of contact between the main body and the pivot shaft, allowing the pivot shaft to bring the second member to rotate and locate at a desired position, relative to the first member.

Abstract: A swivel bearing includes a base for connecting to a first member and a swivel gear for connecting to a second member to be turned relative to the first member. The base is provided on a top with a substantially ring-shaped receiving seat, into which the swivel gear is rotatably mounted. A threaded hole is provided on a predetermined position on the receiving seat for a screwing element to screw thereinto and set the receiving seat to a desired tightness relative to the swivel gear mounted therein. Thus, the second member may be turned to locate at a desired angular position relative to the first member.

Abstract: A pivot bearing mechanism includes a main body and a pivot shaft. The main body is fixedly mounted on a first member, and is provided on a top thereof with an axially extended slit and near the top with an internally threaded hole transversely extended through the slit, such that a screwing element can be tightened into the threaded hole to narrow the slit. The pivot shaft has a first end rotatably supported on the main body and a second end fixedly connected to a second member. By tightening the screwing element into the threaded hole by different degrees, the slit is forced to narrow or widen to allow adjustment of a tightness of contact between the main body and the pivot shaft, allowing the pivot shaft to bring the second member to rotate and locate at a desired position, relative to the first member.

Abstract: A bearing structure includes a pivot shaft and an elastomer for connecting to a pivot device formed from a first and a second connection member. The pivot shaft includes a connecting portion pivotally connected to the first connection member, an eccentric middle portion, and a bearing portion fixedly connected to the second connection member. The elastomer is mounted on the first connection member to contact with the eccentric middle portion of the pivot shaft, such that a tightness of contact between the elastomer and the eccentric middle portion is adjustable via an adjusting screw to locate the first and second connection members in place after they have been turned relative to each other. An elastic element is held between the pivot shaft and the first connection member to adjust a torsional force of the pivot device when the second connection member is turned relative to the first connection member.

Abstract: A connection tightness and swing angle adjustable pivot includes a rotary shaft, a stationary shaft having a slit end rotatably received in an end of the rotary shaft, and an adjusting bolt. The adjusting bolt is screwed into the slit end of the stationary shaft with a head portion located in the rotary shaft but accessible with a hand tool via openings formed on the rotary shaft. The adjusting bolt has a tapered portion contacting with another tapered surface around inner wall of the stationary shaft. When the adjusting bolt is turned at the head portion via the openings on the rotary shaft so that it is screwed further into the stationary shaft, its tapered surface tightly presses against the tapered surface in the stationary shaft to expand the slit end of the stationary shaft, so that the stationary shaft more tightly contacts with inner wall of the rotary shaft.