Thread Clamp Device - JUKI LK-1900A Instruction Manual

6. Thread clamp device

Trouble of sewing (slip-off of needle thread, stitch skipping, or stain of needle thread) at the time of high-
speed start can be prevented with the thread clamp device. The thread clamp device works in the state that
the thread clamp indication LED lights up and does not work when the LED goes off. Changeover of ON/
OFF motion is performed with
becomes the slow start.
1. When memory switch No. 35 is "1" (prohibited), the thread clamp does not work. In
addition,
2. Memory switch, refer to [8] HOW TO USE THE MEMORY SWITCH.
* Matters that demand special attention when using the needle thread clamp device
(1) In case of with the needle thread clamp (motion), make shorter the length of needle thread remaining on the
needle at the sewing start for use. When the length of needle thread is lengthened, needle thread on the
wrong side of material is apt to protrude. In addition, when the length is excessively lengthened, the end of
needle thread held by the needle thread clamp may be rolled in the seams.
1)
3)
(2) It is possible to adjust needle thread shorter by making the needle thread clamp work while holding the
stabilized sewing at the start of sewing and the gathering (bird's nest) of needle thread on the wrong side of
material can be lessened. However, for the pattern which the stitch length for neatly rolling in needle thread
is short, needle thread may protrude from the wrong side of material. Select with/without thread clamp
referring to the item below.
(Right side)
(Wrong side)
key. When the thread clamp device is OFF, the start automatically
key is ineffective.
33 to 36mm
10mm
Needle thread
1) In case of with the needle thread clamp, the
standard of the length of needle thread is 33 to 36
mm.
2) When needle thread is long after replacing thread
or the like or sewing while holding needle thread
by hand, turn OFF the THREAD CLAMP
3) When the needle thread held with the thread clamp
is rolled in the seams, do not draw the material
forcibly and cut the connecting needle thread with
the scissors or the like. The seams are not
damaged since it is the needle thread at the sewing
start.
1) When the sewing length is short (less than
approximately 10 mm), the end of needle thread
may protrude like beard even when adjusting
needle thread shorter.
22
key.