HIGH SPEED, SINGLE NEEDLE, NEEDLE FEED.
LOCKSTITCH INDUSTRIAL SEWING MACHINE
EQUIPPED WITH AN AUTOMATIC UNDERTRIMMER

Owner: Jacob
Location: G14
State: Functioning, but lacks proper access control/bells and whistles

• Reassemble
• Fully clean
• Get missing screws for Feed Dog (Potentially feed dog cover screws too)
  • Feed Dog - Screw 1/8-44 L=6.4 * 2
  • Feed Dog Cover - Screw 11/64-40 L=8 .5 * 2
• Get new oil
• Build new spool holder (Spool rack too)
• Learn to use + write documentation

• Access control, for safety + training reasons'
  • We need new boards, however we may need a bigger relay as the standard ones are 10A, and the machine can run up to 13A

* Modern speed controller for motor * The type of motor we have is a Permanent Split Capacitor motor so we'd need a VFD for best control, a voltage divider could work too but not as well. Not needed, but instead I should adjust the motor so it's easier to run at slow speeds

• Motor brake
  • In theory not needed, as the machine only operates when the belt is engaged with the motor, but the motor does keep spinning for a while when off.
• Reverse engineer snipping mechanism
  • I'm pretty sure it's just an actuator, and I think the wires are broken out? It should be as simple as sending some juice down the line. We should map that to a button instead of the intended mechanism (Full pedal press)

Manual → ddl5522.pdf
Usage Manual → juki_dln-415_better_usage_manual.pdf
Parts List → juki_dln-415-partslist.pdf