Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
36
Stitch Regulator
Stitch Regulator Basic Theory:
In Manual Mode
the operator selects the desired % of machine motor speed on the
display and the stitch length is determined by how fast the operator moves the
machine across the quilt. The faster one moves the longer the stitch – the slower one
moves the shorter the stitch.
In Regulation Mode
the operator selects the desired stitches per inch – from 4 to 15
Stitches Per Inch (SPI) and the machine motor speed is controlled by the stitch
regulator which responds to the speed of the operator’s movement of the machine
across the quilt. The machine will then maintain the selected SPI, if the motion is
within the stitch regulator’s capability or parameters.
Note: In Regulator Mode the
operator cannot select the % of machine motor speed on the display – because it is
controlled by how fast they move the machine across the quilt only.
The Regulator will do the desired stitches per inch if:
•
The regulator is installed, connected, activated, and selected properly.
•
The machine is not moved too slowly.
•
The machine is not moved too fast.
•
The machine speed is not too erratic - changed radically or too quickly.
•
Regulation mode works best when the operator is smooth and consistent
Possible Misunderstandings:
•
Misunderstanding that – One can move the machine any speed and the machine will
do the same size stitch in Regulation Mode. The following is not true - “The machine
will do the same size stitch no matter how fast you move”.
•
Not knowing that: One can move faster than they really should in Regulated Mode.
Note: the fewer Stitches per Inch selected the faster one can move – the more
Stitches per Inch the slower they must move to stay in Regulation Mode. If one
moves too fast the machine will go into “Overspeed Mode” rendering the Regulation
Mode ineffective until the operator slows down under the Overspeed Mode.
Setup and Mechanical Problems:
•
Improper installation of the SR encoder wheels - bracket too tight or too loose.
•
No spring on rear machine encoder wheel.
•
Encoder wheel mounted in wrong place/position on carriage. Note: both encoder
assemblies are mounted on the left side – as seen by the operator from the front
handle bar – one on the power cord side of the machine and one on the front of the
carriage – carriage front is the side with the long overhang on the carriage.
•
Improper connection of the encoder cables. Single cable to front carriage encoder –
double cable to back machine encoder.
•
Regulator not activated properly. Note: make sure done in Setup / Regulated, - not
Setup / Serial – which is 1 line above Regulated on the LCD display.