Computerized pattern sewing machine

Abstract

This computerized pattern sewing machine includes: a needle plate, a needle, a shuttle, a movable cutter, a fixed cutter, a thread spring, and a controller. The movable cutter, besides being used to cut the thread at the end of sewing, can also be moved to the thread clamping position by the controller during the initial sewing stage. The movable cutter and the thread spring can then clamp the thread end together. With the thread end clamped and at least one stitch completed, the controller moves the movable cutter to the cutting position, allowing the movable and fixed cutters to cut off a portion of the thread end. In this way, the computerized pattern sewing machine can automatically trim the thread end before sewing, effectively preventing the formation of bird's nest-like clumps of thread on the back of the sewn fabric due to excessively long thread.

Claims

1. A computerized pattern sewing machine, comprising: a base having a shuttle bed, the top of which is provided with a needle plate; a needle bar mechanism located above the base, having a needle bar and a needle, the needle bar performing a sewing action, causing the needle to drive a thread to sequentially pass through a sewing material and a needle hole of the needle plate, thereby a portion of the thread being located below the needle plate to form a thread end; a hooking mechanism having a base connected to the shuttle bed, a lid connected to the base, and a shuttle disposed between the base and the lid, the shuttle being able to reciprocate to hook the thread, causing the thread to interweave with a bobbin thread below the needle plate, thereby forming a seam on the surface of the sewing material; and a cutting mechanism disposed on the shuttle bed, having a fixed cutter, a movable cutter oscillating relative to the needle plate, and a thread spring adjacent to the fixed cutter, the movable cutter oscillating to pass below the needle hole. A blowing mechanism capable of generating a blowing airflow toward the aforementioned tangential mechanism; and a controller electrically connected to the aforementioned tangential mechanism; wherein... When a thread end is formed below the needle plate, the controller controls the movable cutter to swing, so that the movable cutter can guide the thread end to the needle spring, and then the movable cutter can stop at a clamping position, where the movable cutter and the needle spring together clamp the thread end; wherein, when at least one seam is formed on the surface of the sewn material, and the thread end is clamped by the movable cutter and the needle spring, the controller controls the movable cutter to swing from the clamping position to a cutting position, so that the movable cutter and the fixed cutter together cut off a portion of the thread end, and the remaining thread segment of the thread end remains below the needle plate to form a trimmed thread end shorter than the thread end, and the cut thread end can be moved away from the cutting mechanism by the airflow.

2. The computerized pattern sewing machine as described in claim 1, wherein, The aforementioned tangent mechanism further includes a tangent drive source and a linkage unit. The tangent drive source can drive a cam to rotate, and the cam is provided with a drive rail. One end of the linkage unit is connected to the movable cutter, and the other end of the linkage unit is provided with a roller that can be embedded in the drive rail. When the cam rotates, the drive rail can guide the roller to move, so that the linkage unit can drive the movable cutter to move to the clamping position and the cutting position.

3. The computerized pattern sewing machine as described in claim 2, wherein, The aforementioned drive track is provided with a cutting action section, a preparatory action section, and a clamping action section. The cutting action section is used to restrict the movement of the roller temporarily, so that the movable cutter stays at the cutting position. The preparatory action section is used to guide the roller to move toward the clamping action section, so that the movable cutter moves to a preparatory position. The clamping action section is used to guide the roller to move toward the cutting action section, so that the movable cutter moves to the clamping position.

4. The computerized pattern sewing machine as described in claim 2, wherein, The aforementioned linkage unit has a connecting rod that connects to the aforementioned movable cutter and a swing rod that can swing. The connecting rod and the swing rod are pivotally connected to each other, and the swing rod is provided with the aforementioned roller, so that when the relative position between the aforementioned roller and the aforementioned drive track is changed by the rotation of the aforementioned cam, the aforementioned swing rod can reciprocate.

5. The computerized pattern sewing machine as described in claim 1, wherein, The lower side of the needle plate is recessed to form a receiving groove, and a portion of the needle and thread spring is located inside the receiving groove.

6. The computerized pattern sewing machine as described in claim 5, wherein, The needle plate is further recessed from the accommodating groove to form a clearance groove. When the movable cutter and the needle thread spring clamp the needle thread end together, the needle thread spring can deform toward the inside of the clearance groove, so that a part of it is simultaneously located inside the accommodating groove and the clearance groove.

7. The computerized pattern sewing machine as described in claim 1, wherein, The aforementioned computerized pattern sewing machine further includes a suction hood, which is connected to the aforementioned thread hooking mechanism and positioned in the flow path of the aforementioned airflow, so that the suction hood can receive the cut thread ends through the aforementioned airflow.

8. The computerized pattern sewing machine as described in claim 7, wherein, The aforementioned suction hood has a hood portion and a fan hood connecting portion. The hood portion has a pot lid notch, and the fan hood connecting portion is connected to the pot lid so that the pot lid passes through the pot lid notch, thereby positioning the hood portion on one side of the pot lid.

9. The computerized pattern sewing machine as described in claim 8, wherein, The aforementioned cover is located below the aforementioned movable cutter and has a cutter notch adjacent to the aforementioned movable cutter, the cutter notch being used to allow the aforementioned movable cutter to pass through during the swinging process.

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