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How　to　Deal　with　Design　Empty　Jump　Stitches

post at:2008-2-28 9:16:46

Customers in different places use different punching systems and they also use different editing methods. Especially in dealing with empty stitch and empty jump stitch (X and Y =0), the same stitch code are for different purposes. So we explain this issue here and hope it can help customers in using Dahao control systems.

Here’s one example. Some customers found: some designs in trimming machines will cause first trimming when beginning embroidery, then over frame; in non trimming machines they will cause first needle pricking and then over frame. After analysis we found it was because the first two stitches in the design are empty jump stitches.

The following diagram is the codes of the mentioned designs. You can see the first two stitches are 00 00 83. According to the rule of data, the two stitches are empty jump stitches. If the machine parameter “filter empty stitch” is set as “No”, the two stitches will be transferred into one empty stitch when data is being read. If over frame code follows, there will be trimming before moving and then over frame. The situation: two empty jump stitches at the beginning of design has relation to the punching system. Some punching system will insert two empty jump stitches at the design start point. If “filter empty stitch” is set as “Yes”, when data is read, the empty jump stitches will be filtered. This can solve the problem: first trimming and then over frame. But we found it was not the best solution.

If “filter empty stitch” is set as “Yes”, both empty stitches and empty jump stitches will be filtered. This is not right for common designs. Because the first empty stitch is filtered, design start point will omit one stitch. However this empty stitch shouldn’t be neglected. So software version 19c for 2x6 control system and software version 17x for 2x2/2x8 control system add one new parameter “filter empty stitch at start”. When this parameter is set as “Yes” and “filter empty stitch” is set as “No”, the above problem is solved. Now the default settings of these parameters are like that.

Some people may ask why the two empty jump stitches must be transferred into one empty stitch. It’s because it has special purpose. E.g. in Shaoxing market because of embroidery requirement, it needs to prick once (boring needle) at the design start point and then embroidery begins. To realize this function, you can edit 2 empty jump stitches at the beginning and “filter empty stitch at start” and “filter empty stitch” are both set as “No”. The results of parameters are shown in the following form:

Filter empty stitch or not	Filter empty stitch at start or not	Result
yes	yes	All empty stitches and empty jump stitches are filtered.
yes	no	All empty stitches and empty jump stitches are filtered.
no	yes	Empty jump stitches are filtered. Solve the problem: at start first trim without moving then over frame.
no	no	Two empty jump stitches are changed into one empty stitch. Original empty stitches don’t change. It’s to meet the special requirement: the boring needle first pricking once at start.

The customer can set the two parameters according to requirements.