Working method

The photocell controls following functions at the seam end:

• Automatic stopping of the machine with the needle down (which facilitates accurate positioning of the next part)
• Chain cutting
• Presser foot lifting

The length of the protruding thread chain can be set via parameter. The length of the starting thread chain is constant approx. 8 mm (-12/22) or 12 mm (12/23). The thread chain is clamped between sewing cycles and is not released until shortly after the next sewing cycle has begun. This ensures a reliable and seam start (and prevents the thread from being drawn into the needle hole). All the operator has to do is insert, guide and remove the workpiece.

Features

• Highest Output of 2,000 pairs of shoes in 480 minutes, sewing an 8-cm-long
• curved heel seam
• Elastic and flexible seam; no bursting of the heel seam at high pressure
• Sturdy sewing parts enable closing heel seams on shoes or boots made from heavier materials
• Shift-free sewing of problem materials ensured by a favourable combination of feed mechanisms (top feed stroke can be set independently of the bottom feed stroke; in addition, the pressure of presser foot and vibrating presser can be varied separately)
• Consistently high quality of the sewn parts, largely independent of the operator‘s skill, as a result of partial mechanization of the work cycle
• Low training costs: The simple operation of the machine, reduced to a minimum by automatic control sequences (via parameter or photocell)
• 3806-12/22: For processing heavy fabrics
• 3806-12/23: For processing light to medium heavy fabrics as well as operations with narrow radii the bottom with trimming unit for the precise positioning of tape beginning and tape end

Specifications

• Max. sewing speed: 4,000 s.p.m.
• Max. stitch length:        
  -12/22: 3,5 cm
  -12/23: 4,5 cm
• Clearance under the sewing foot:
  -12/22: 7 mm
  -12/23: 9 mm
• Needle system:
  -12/22: 4463-KKS
  -12/23: 4463-35-KKS
• Needle size:              
  -12/22: Nm 80 - 100
  -12/23: Nm 80 - 120
• Thread size:              
  -12/22: to 40/3 synth.
  -12/23: to 40/3 synth.