Control method, control device and sewing system for a sewing machine

Abstract

The application provides a sewing machine control method, a control device and a sewing system. The sewing machine comprises a rack, a first driving assembly, a lifting piece, a pressing rod, an elastic piece, a presser foot, a needle plate and a needle assembly. The first driving assembly is arranged on the rack. One end of the lifting piece is connected with the first driving assembly. The other end of the lifting piece is connected with the pressing rod and one end of the elastic piece respectively. The other end of the elastic piece is fixed on the rack. The pressing rod is connected with the presser foot. The first driving assembly is used for driving the lifting piece to compress or stretch the pressing rod, so that the pressing rod drives the presser foot to lift or drop. The elastic piece is in a compressed state when the presser foot lifts or drops. The method is characterized in that the method comprises the following steps: controlling the first driving assembly to drive the lifting piece to stretch the pressing rod, so that the pressing rod drives the presser foot to drop until the presser foot contacts the needle plate; and controlling the needle assembly to sew a first needle on a to-be-sewn article. The control method solves the problem that the first needle of the sewing machine cannot form a stitch in the prior art.

Claims

1. A control method for a sewing machine, the sewing machine comprising a frame, a first drive assembly, a lifting member, a pressure bar, an elastic element, a presser foot, a needle plate, and a needle assembly, wherein the first drive assembly is disposed on the frame, one end of the lifting member is connected to the first drive assembly, the other end of the lifting member is connected to one end of the pressure bar and one end of the elastic element respectively, the other end of the elastic element is fixed to the frame, the pressure bar is connected to the presser foot, the first drive assembly is used to drive the lifting member to compress or stretch the pressure bar, so that the pressure bar drives the presser foot to rise or fall, and the elastic element is in a compressed state when the presser foot is raised or lowered, characterized in that... The control method for the sewing machine includes: The first drive assembly is controlled to drive the lifting member to stretch the pressure rod, so that the pressure rod drives the pressure foot to descend until the pressure foot contacts the needle plate; Control the needle assembly to sew the first stitch on the item to be sewn; After the needle assembly sews the first stitch onto the item to be sewn, the sewing machine control method further includes: controlling the first drive assembly to drive the lifting member to compress the pressure bar, so that the pressure bar drives the presser foot to rise to a predetermined position; and controlling the needle assembly to continue sewing the item to be sewn. The first drive assembly includes a drive motor, a first crank, a connecting rod, and a second crank. One end of the first crank is rotatably mounted on the output shaft of the drive motor, and the other end of the first crank is connected to the connecting rod. One end of the second crank is rotatably mounted on the frame, and the other end of the second crank is connected to the lifting member. Controlling the first drive assembly to drive the lifting member to stretch the pressure rod, so that the pressure rod drives the pressure foot to descend until the pressure foot contacts the needle plate, includes: controlling the output shaft to rotate by a predetermined angle, causing the end of the first crank connected to the connecting rod to move downward, so that the connecting rod drives the second crank to rotate until the protrusion of the second crank disengages from the lifting member, and stretching the pressure rod under the elastic force of the elastic member, so that the pressure rod drives the pressure foot to descend until the pressure foot contacts the needle plate; The needle assembly includes a second drive assembly, a third crank, a connecting rod, and a needle. One end of the third crank is rotatably disposed at one end of the second drive assembly, and the other end of the third crank is connected to the connecting rod. The connecting rod is connected to the needle. Controlling the needle assembly to continue sewing the item to be sewn includes: controlling the second drive assembly to drive the third crank to rotate, thereby driving the connecting rod to move the needle up and down to sew the item to be sewn.

2. The control method for a sewing machine according to claim 1, characterized in that, Controlling the first drive assembly to drive the lifting member to compress the pressure rod, so that the pressure rod drives the pressure foot to rise to a predetermined position, includes: The output shaft is controlled to rotate by a predetermined angle in the opposite direction of the previous rotation. The output shaft drives the lifting member to compress the pressure rod through the first crank and the second crank, so that the pressure rod drives the pressure foot to rise to the predetermined position.

3. A control device for a sewing machine, the sewing machine comprising a frame, a first drive assembly, a lifting member, a pressure bar, an elastic element, a presser foot, a needle plate, and a needle assembly, wherein the first drive assembly is disposed on the frame, one end of the lifting member is connected to the first drive assembly, the other end of the lifting member is connected to one end of the pressure bar and one end of the elastic element respectively, the other end of the elastic element is fixed to the frame, the pressure bar is connected to the presser foot, the first drive assembly is used to drive the lifting member to compress or stretch the pressure bar, so that the pressure bar drives the presser foot to rise or fall, and the elastic element is in a compressed state when the presser foot is raised or lowered, characterized in that... The control device for the sewing machine includes: A first control unit is configured to control the first drive assembly to drive the lifting member to stretch the pressure rod, so that the pressure rod drives the pressure foot to descend until the pressure foot contacts the needle plate; The second control unit is used to control the needle assembly to sew the first stitch on the item to be sewn. The control device of the sewing machine further includes: a third control unit, used to control the first drive assembly to drive the lifting member to compress the pressure bar after the needle assembly sews the first stitch on the item to be sewn, so that the pressure bar drives the presser foot to rise to a predetermined position; and a fourth control unit, used to control the needle assembly to continue sewing the item to be sewn. The first drive assembly includes a drive motor, a first crank, a connecting rod, and a second crank. One end of the first crank is rotatably mounted on the output shaft of the drive motor, and the other end of the first crank is connected to the connecting rod. One end of the second crank is rotatably mounted on the frame, and the other end of the second crank is connected to the lifting member. The first control unit is used to control the output shaft to rotate by a predetermined angle, causing the end of the first crank connected to the connecting rod to move downward, so that the connecting rod drives the second crank to rotate until the protrusion of the second crank disengages from the lifting member. Under the elastic force of the elastic member, the pressure rod is stretched, so that the pressure rod drives the pressure foot to descend until the pressure foot contacts the needle plate. The needle assembly includes a second drive assembly, a third crank, a connecting rod, and a needle. One end of the third crank is rotatably disposed at one end of the second drive assembly, and the other end of the third crank is connected to the connecting rod. The connecting rod is connected to the needle. The fourth control unit is used to control the second drive assembly to drive the third crank to rotate, thereby driving the connecting rod to move the needle up and down to sew the item to be sewn.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein the program executes the control method for the sewing machine according to claim 1 or 2.

5. A processor, characterized in that, The processor is used to run a program, wherein the program executes the control method of the sewing machine according to claim 1 or 2.

6. A sewing system comprising a sewing machine and a control device for the sewing machine, characterized in that, The control device of the sewing machine is used to execute the control method of the sewing machine as described in claim 1 or 2.

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