Method and device for producing a pocket on a workpiece

A method for producing a pocket comprising the steps of:

• a folding step for folding a pocket cut at marginal edges having two lateral portions and a bottom portion forming substantially a U-shaped configuration;
• and
• a sewing step for attaching said folded pocket cut at said folded marginal edges to a workpiece by a stitch row, said folded pocket cut being clamped at said folded marginal edges onto said workpiece;
• said folding step including:
• a first folding step for producing at least one pair of folds in said lateral portions, and
• a second folding step for producing the folding of said marginal edges,
• said pair of folds being rebounded with respect to said folded marginal edges and being bi-directionally positioned and clamped in position during the sewing step, said folded pocket cut being clamped onto said workpiece during said sewing step by pressing the first folds onto the folded marginal edges of said pocket cut.

Apparatus for producing a pocket comprising:

• a sewing machine including stitch forming means with a needle;
• control means for producing said stitch row according to a predetermined contour as a relative movement between said needle and said workpiece including said pocket cut;
• and
• means for receiving said workpieces comprising:
• sword means defining said geometrical configuration of said folded pocket cut;
• means for retracting said sword means out of the sewing region;
• creasing means operating upon the marginal edges of said unfolded pocket cut having:
• two side creasers acting upon said two lateral portions, and
• a front creaser acting upon said bottom portion, and
• clamping means arranged above said sword means and having a similar and smaller geometrical configuration as said sword means for clamping said folded pocket cut,
• said clamping means comprising:
• outside edges and folder blades movably arranged below said clamping means and cooperating with said outside edges so as to form a fold at each of said lateral portions prior to the marginal edge folding of said pocket cut.

Apparatus for producing a pocket comprising:

• a sewing machine including a supporting plate and stitch forming means with a needle;
• control means for producing said stitch row according to a predetermined contour as a relative movement between said needle and said workpiece including said pocket cut supported by said supporting plate;
• and
• means for receiving said workpieces, comprising:
• a frame movably arranged with respect to said needle and in a firm parallel plane relative to said supporting plate;
• a clamp for clamping said workpiece on said supporting plate,
• said clamp being raiseably or lowerably pivoted at said frame;
• a first bracket lowerably pivoted at said frame;
• a first plate retractably pivoted at said first bracket and having fold edges;
• lateral slides slidably received on said clamp and cooperating with said fold edges of said plate so as to fold the marginal edges of said pocket cut;
• a second bracket lowerably pivoted at said frame;
• a second plate having a similar and reduced geometric configuration than the first plate, including lateral edges,
• said second plate being fastened to said second bracket;
• bearing means extending parallelly to said supporting plate and situated at said second bracket;
• folders each fastened to said bearing means cooperating with said lateral edges of said second plate for forming said pair of folds in said lateral portions;
• and
• drive means arranged on said second bracket for laterally moving said folders.