Method for achieving trimming, presser foot lift and close-stitch sewing of sewing machine
A presser foot lifting and sewing machine technology, applied in the field of sewing machines, can solve the problems of low transmission efficiency, complex mechanical structure, and large sewing machine space, and achieve the effects of simple and compact structure, high transmission efficiency, and simplified structure
Active Publication Date: 2020-08-07
JACK SEWING MASCH CO LTD
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Problems solved by technology
The mechanical structure of this driving method is complicated, the transmission efficiency is low, and it takes up a lot of space on the sewing machine. In addition, the electromagnet is hard-started, which will inevitably cause relatively large noise and vibration. Pads, etc.) due to large impact, poor durability
Method used
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[0037] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, not to limit the present invention.
[0038] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying Describes, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate in a specific orientation, and therefore should not be construed as limiting the inventio...
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The invention relates to the technical field of sewing machines, in particular to a method for achieving trimming, presser foot lift and close-stitch sewing of a sewing machine. According to the method, a power piece drives a trimming cam, a presser foot lift crank and a close-stitch sewing cam to rotate, in the sewing process, the close-stitch sewing cam can drive a stitch length adjusting mechanism to execute motions of stitch length adjusting so that the stitch length can be adjusted and maintained at the set close-stitch sewing stitch length, and the operation of close-stitch sewing is completed when the number of sewing stitches under the set close-stitch sewing stitch length reaches the set close stitch number; the trimming cam can drive a trimming mechanism to execute motions of trimming after close-stitch sewing is completed or the operation of close-stitch sewing is not carried out; and the presser foot lift crank can drive a presser foot lift mechanism to carry out motions ofpresser foot lift. In this way, the three functions of trimming, presser foot lift and close-stitch sewing are achieved under driving of one power piece, the structure can be greatly simplified, andmore than 50% of space of a baseboard of the sewing machine can be emptied, so that the structure is simple and compact, the transmission efficiency is high, and the stability is high.
Description
technical field [0001] The invention relates to the technical field of sewing machines, in particular to a method for thread trimming and lifting of a presser foot of a sewing machine for dense stitching. Background technique [0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the cloth to interweave or sew one or more layers of sewing materials. The sewing machine usually consists of four parts: feeding device, base, transmission and accessories. The movement of each mechanism is reasonably coordinated, and the cycle works to sew the sewing materials together. [0003] At present, the sewing machine will use the functions of automatic thread trimming, automatic presser foot lift and dense stitching during the sewing process. Commonly, three electromagnets with different powers drive the thread trimming mechanism, the presser foot lifting mechanism and the stitch distance adjustment mechanism respectively to realize th...
Claims
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IPC IPC(8): D05B65/00D05B29/02D05B55/12D05B55/14D05B69/10D05B69/02
CPCD05B29/02D05B55/12D05B55/14D05B65/00D05B69/02D05B69/10
Inventor 黄明学林晓晓
Owner JACK SEWING MASCH CO LTD