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16. TIME CHART
Item
1-pedal
Function name
Sewing motion
sequence
Details
Presser lifter : 5-phase stepping motor (half step control)
Presser lifter is controlled at 3 positions of max. height position (variable), cloth set position (variable) and sewing position.
Needle thread trimmer : 2-phase stepping motor (half step control)
Needle thread trimmer is controlled at 4 positions of mechanical connection cut-off position, roll-in at sewing start position (variable), waiting
position, trimming position.
[Motor rotation position]
Origin
1 Mechanical
connection cut-
off position
Trimmer open position
2 Roll-in at sewing
start position
3 Waiting position
4 Trimming position
4
2
1
3
Trimmer open position
Presser
Bobbin thread trimmer : 2-phase stepping motor (half step control)
Bobbin thread trimmer is controlled at 4 positions of trimmer open position, small amount open position, waiting position, and trimming
position.
[Motor rotation position]
Motion sequence
Needle thread
trimmer
2 Roll-in at sewing
start position
Motion starts at the move of set
sewing length.
Motion starts at the set angle of
the last stitch.
Bobbin thread trimmer
!2 Waiting position
Sewing machine
speed
Height of
presser
Cloth set position at
1st step of pedal
Motion starts at the move
of set sewing length.
Allocate moving pulse amount to K21 of maintenance
personnel level and at the same time of change,
perform writing to EEPROM of machine head.
Sewing position at 2nd step of pedal
Machine starts at 3rd
step of pedal.
Start-up of
machine
Motion starts after set
time. (30 ms)
Presser automatically goes up at the
completion of machine motion.( Max.
position)
!2 Waiting position
Origin
!3 Trimming
position
!1 Trimmer open
position
!0 Small amount
open position
Max. height position
at pedal free
1
3
4
32
!0
!1
!2 !3
!2
Bobbin thread trimmer starts
moving to trimmer open
position after outputting 3
pulses in total from small
amount open by outputting 1
pulse per set time of designer
level L06.
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