Provided is an automatic mattress sterilization apparatus configured to sterilize a mattress, including a frame extending in one direction and on which the mattress is placed, a sterilization part coupled to an upper portion of the frame and having an inner space through which the mattress passes, and a moving part provided in the frame and configured to move the mattress placed on the frame, and the mattress is moved from one side of the sterilization part to the other side of the sterilization part via the inner space of the sterilization part by the moving part.

Provided is an automatic mattress sterilization apparatus configured to sterilize a mattress, including a frame extending in one direction and on which the mattress is placed, a sterilization part coupled to an upper portion of the frame and having an inner space through which the mattress passes, and a moving part provided in the frame and configured to move the mattress placed on the frame, and the mattress is moved from one side of the sterilization part to the other side of the sterilization part via the inner space of the sterilization part by the moving part.

A driving clutch device for a sewing machine includes a drive shaft, a passive member, a clutch seat, an actuating seat, a power unit, and a clutch member. Through fixing the passive member and the clutch seat onto the drive shaft, rotatably disposing the actuating seat, the drive shaft, and returnably disposing the clutch member to the clutch seat, the clutch seat and the actuating seat are able to move synchronously when the clutch member is in the engaged position, but not to move synchronously when the clutch member in the disengaged position, thereby achieving the driving and clutch controls only by the clutch member, the passive member, the clutch seat and the actuating seat. Therefore, the driving clutch device is simpler and the driving is more direct and instant, thereby reducing assembly costs and the error of action coordination.

A driving clutch device for a sewing machine includes a drive shaft, a passive member, a clutch seat, an actuating seat, a power unit, and a clutch member. Through fixing the passive member and the clutch seat onto the drive shaft, rotatably disposing the actuating seat, the drive shaft, and returnably disposing the clutch member to the clutch seat, the clutch seat and the actuating seat are able to move synchronously when the clutch member is in the engaged position, but not to move synchronously when the clutch member in the disengaged position, thereby achieving the driving and clutch controls only by the clutch member, the passive member, the clutch seat and the actuating seat. Therefore, the driving clutch device is simpler and the driving is more direct and instant, thereby reducing assembly costs and the error of action coordination.

A closed-loop control device of a mechanical sewing machine includes an isolated switch-mode power supply module, a DC motor, a speed control module, a processor, an electronic switch, a current detection module and a voltage detection module. The isolated switch-mode power supply module rectifies an AC power to a DC power and supplies the DC power to the DC motor. The speed control module sends a speed signal to the processor. The processor adjusts an output voltage to the DC motor according to the speed signal. The current detection module and the voltage detection module further detect an operating current signal and an operating voltage signal of the DC motor for the processor to control a turn-on time of the electronic switch to adjust an average operating voltage of the DC motor according to the operating current signal, the operating voltage signal and the speed signal.

A closed-loop control device of a mechanical sewing machine includes an isolated switch-mode power supply module, a DC motor, a speed control module, a processor, an electronic switch, a current detection module and a voltage detection module. The isolated switch-mode power supply module rectifies an AC power to a DC power and supplies the DC power to the DC motor. The speed control module sends a speed signal to the processor. The processor adjusts an output voltage to the DC motor according to the speed signal. The current detection module and the voltage detection module further detect an operating current signal and an operating voltage signal of the DC motor for the processor to control a turn-on time of the electronic switch to adjust an average operating voltage of the DC motor according to the operating current signal, the operating voltage signal and the speed signal.

A sewing machine system includes an optical encoder which senses relative movement between the sewing machine and fabric and varies the stitching speed of the sewing machine to create stitches according to a user selected stitch length.

A sewing machine system includes an optical encoder which senses relative movement between the sewing machine and fabric and varies the stitching speed of the sewing machine to create stitches according to a user selected stitch length.

A sewing machine system includes an optical encoder which senses relative movement between the sewing machine and fabric and varies the stitching speed of the sewing machine to create stitches according to a user selected stitch length.

A sewing machine system includes an optical encoder which senses relative movement between the sewing machine and fabric and varies the stitching speed of the sewing machine to create stitches according to a user selected stitch length.