Needle plate

Abstract

To sufficiently secure the remaining length of a needle thread in a sewing needle after thread cutting and to surely perform thread cutting. The needle plate of a sewing machine is provided with a thread cutter 110 for cutting the needle thread, and a shuttle mechanism 103 provided under the thread cutter 110 for passing a bobbin thread through a loop of the needle thread. Besides, the thread cutter is equipped with a moving scalpel 111 for forward movement of a reciprocating and turning action along with an approximately horizontal direction to sort the needle thread to be the upstream side of the shuttle mechanism 103 and for backward movement to carry a needle thread U1 which is on the downstream side of the shuttle mechanism 103, to a cutting position, and a thread hauling member 112 for locking the needle thread U1 selected by the moving scalpel 111 to be located on the upstream side. The needle plate 20 of the sewing machine is then equipped with a needle hole 23 where a sewing needle 15 is inserted and on its lower side surface, a thread guide groove 24 is provided approximately along with the same direction from a terminal portion of the needle hole 23 on the side of a reciprocating direction F of the moving scalpel.

Description

technical field [0001] The present invention relates to a needle plate used on a sewing machine having a movable cutter for thread cutting below the needle plate. Background technique [0002] Next, a conventional sewing machine provided with the thread cutting device 110 will be described. The sewing machine, such as Figure 7 , 8 As shown, it is provided with: a needle plate having a needle hole 102 passing through when the machine needle 101 moves up and down, a thread cutting device 110 which is arranged under the needle plate and cuts the upper thread and the lower thread, and is arranged under the thread cutting device 110. And pass the lower thread through the hook mechanism 103 of the thread loop formed by the upper thread. [0003] In addition, during sewing, the upper thread U is connected to the machine needle 101 through a thread gripper and a thread take-up lever (not shown) from an unshown upper thread supply source. [0004] On the other hand, the bobbin th...

AI Technical Summary

Problems solved by technology

[0024] according to Figure 10 , the upper thread U is obviously bent at the contact point with each component, and as a result, sliding friction occurs at the contact point and the upper thread cannot be fully pulled out from the upper thread supply source side, and the needle 101 cannot be secured after cutting. The problem of the remaining length of the upper thread

[0025] In addition, as the boundary between the surface under the needle plate and the inner surface of the needle hole, it has a curved surface shape with a large radius of curvature, but because it is not suitable for final sewing, friction cannot be sufficiently reduced, and the upper thread caught on the thread-evolving member, The lower end of the inner surface of the needle hole is subjected to a large frictional force, and there is a problem that the remaining length of the upper thread on the needle 101 cannot be ensured after cutting.

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