Provided are: a sewing device provided with a sewing mechanism which performs sewing on a work to be sewn using a sewing-machine needle, while holding the work to be sewn in a state of being shaped in a predetermined shape on a plurality of seating portions arranged in a sewing direction; and a sewing method. When the seating portions are withdrawn from the work to be sewn so as to avoid interference between the sewing mechanism and the seating portions, a guiding mechanism enables movement in a first withdrawing direction for avoiding a first undercut portion of the work to be sewn, and movement in a second withdrawing direction for avoiding a second undercut portion of the work to be sewn.

A drive apparatus for sewing machines including a forepart and a motor shaft horizontally projecting out of the forepart is provided with a sleeve releasably secured to the motor shaft; a rotor disposed on the sleeve; and a motor assembly including a housing having an axial passage with the sleeve rotatably disposed through, an inner space disposed on an end of the housing proximate the forepart, and a stator set disposed in the inner space. The rotor is disposed in the inner space. The rotor, the sleeve, and the motor shaft are co-rotated.

A drive apparatus for sewing machines including a forepart and a motor shaft horizontally projecting out of the forepart is provided with a sleeve releasably secured to the motor shaft; a rotor disposed on the sleeve; and a motor assembly including a housing having an axial passage with the sleeve rotatably disposed through, an inner space disposed on an end of the housing proximate the forepart, and a stator set disposed in the inner space. The rotor is disposed in the inner space. The rotor, the sleeve, and the motor shaft are co-rotated.

Dual-motor sewing machine with automatic timing adjustment. In some embodiments, a sewing machine may include a frame, a needle bar configured to have a needle, a first motor configured to cause the needle bar to linearly reciprocate the needle with respect to the frame and into and out of a fabric, a first sensor configured to continuously sense a current position of the needle, a bobbin hook configured to function in connection with a bobbin, a second motor configured to cause the bobbin hook to rotate with respect to the frame, a second sensor configured to continuously sense a current position of the bobbin hook, and one or more motor controllers. The one or more motor controllers may be configured, based on the current positions sensed by the first sensor and the second sensor, to continuously and automatically adjust and synchronize timing of the first motor and/or the second motor.

Dual-motor sewing machine with automatic timing adjustment. In some embodiments, a sewing machine may include a frame, a needle bar configured to have a needle, a first motor configured to cause the needle bar to linearly reciprocate the needle with respect to the frame and into and out of a fabric, a first sensor configured to continuously sense a current position of the needle, a bobbin hook configured to function in connection with a bobbin, a second motor configured to cause the bobbin hook to rotate with respect to the frame, a second sensor configured to continuously sense a current position of the bobbin hook, and one or more motor controllers. The one or more motor controllers may be configured, based on the current positions sensed by the first sensor and the second sensor, to continuously and automatically adjust and synchronize timing of the first motor and/or the second motor.

Due to rapid advancement in computing technology of both hardware and software, the labor intensive sewing process has been transformed into a technology-intensive automated process. During an automated process, product materials may become wrinkled or folded, which can slow down the automated process or result in human intervention. Various examples are provided related to the automation of sewing robots, and removal of wrinkles from products. Images of material on a work table can be captured and analyzed to determine if there are wrinkles or folds in the product. The robot can remove the wrinkle or fold by manipulating the material through the use of end effectors such as, e.g., budgers.

Due to rapid advancement in computing technology of both hardware and software, the labor intensive sewing process has been transformed into a technology-intensive automated process. During an automated process, product materials may become wrinkled or folded, which can slow down the automated process or result in human intervention. Various examples are provided related to the automation of sewing robots, and removal of wrinkles from products. Images of material on a work table can be captured and analyzed to determine if there are wrinkles or folds in the product. The robot can remove the wrinkle or fold by manipulating the material through the use of end effectors such as, e.g., budgers.

A sewing control device includes in a sewing machine having upper feed function a control device which controls feed of an object to be sewn. A lower feed amount setting motor sets a feed amount of a lower feed dog and an upper feed amount change motor changes a feed amount of an upper feed dog. A feed execution range, in which the feed of the object to be sewn is executed by an appropriate feed amount while the object to be sewn is sandwiched between the lower feed dog and the upper feed dog, and a feed non-execution range, in which the feed of the object to be sewn is not executed in a state in which the feed dogs do not act on the object to be sewn, are present. The feed amount of the upper feed dog can be changed only in the feed non-execution range during sewing.

A sewing control device includes in a sewing machine having upper feed function a control device which controls feed of an object to be sewn. A lower feed amount setting motor sets a feed amount of a lower feed dog and an upper feed amount change motor changes a feed amount of an upper feed dog. A feed execution range, in which the feed of the object to be sewn is executed by an appropriate feed amount while the object to be sewn is sandwiched between the lower feed dog and the upper feed dog, and a feed non-execution range, in which the feed of the object to be sewn is not executed in a state in which the feed dogs do not act on the object to be sewn, are present. The feed amount of the upper feed dog can be changed only in the feed non-execution range during sewing.

Dual-motor sewing machine with automatic timing adjustment. In some embodiments, a sewing machine may include a frame, a needle bar configured to have a needle, a first motor configured to cause the needle bar to linearly reciprocate the needle with respect to the frame and into and out of a fabric, a first sensor configured to continuously sense a current position of the needle, a bobbin hook configured to function in connection with a bobbin, a second motor configured to cause the bobbin hook to rotate with respect to the frame, a second sensor configured to continuously sense a current position of the bobbin hook, and one or more motor controllers. The one or more motor controllers may be configured, based on the current positions sensed by the first sensor and the second sensor, to continuously and automatically adjust and synchronize timing of the first motor and/or the second motor.