Equipment 13
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Transcript of Equipment 13
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EQUIPMENT TECHNOLOGYSRI LANLKA INSTITUE OF TEXTILE & APPAREL
DIPLOMA IN TEXTILE & CLOTHING TECHNOLOGY
Laboratory Information Sheet
Department : Engineering.
Subject Area : Adjustment on Sewing Machines.
Sub division : Preparation of Samples.
Related theory : puckering and adjustments on the single needle lock
stitch machine.
Equipment : single needle lockstitch, double needle lock stitch,
overlook or safety stitch, single needle lock stitch with
variable top and bottom feed.
Material : Cloth materials thick to thin.
Other accessory : Needle in different size. (Size 8, 9, 10, 12, 14)
Thread ticket (No: 75,120,180)
Procedure : Produce samples using sewing equipment following
facts to be considered.
a) Thread tension stroke of the take up spring.b) Pressure of the presser foot.c) Height of the feed dog.d) Feed dog type.e) Feeding System.
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EQUIPMENT TECHNOLOGYPROCEDURE
First we measure values in the single needle lock stitch machine
using tension gauge set .then sew sample& measure. After sew correct
sample 7then measure new values. many different items need to be
adjusted to properly adjust the sewing machine we have devolved a
measuring tool set which consist of three different kind of measuring
tools used to adjust the three easiest adjustment factors such as needle
thread tension, bobbin thread tension & properly adjusting these three
adjusting items.To use the pressure measuring jig, a bar tension gauge
(separately available) is necessary in addition.
(Pressure measuring jig & Pressure adjusting ruler)
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EQUIPMENT TECHNOLOGYNeedle Thread Tension Measuring Tool
a)Set the Needle thread tension measuring tool to the position, asillustrated in the figure, on the machine head.
b)Turn the pulley until the needle bar is brought to the highestposition of its stroke. Now, draw the thread through between arm
thread guides A 1 and thread take up lever 2, and pass the thread
on thread guide 3 and movable lever 4 of the needle thread tension
measuring tool. At this time, take care not to allow the drawn
thread to come in contact with tension nut no 5.
c)Slowly pull down thread 6 at this side of the needle. Now, readscale value 7 indicated on the needle thread measuring tool. This is
the needle thread tension.
d)Observing the scale, adjust the thread tension by turning tensionnut 8. Turning the nut in direction g will decrease the needle thread
Tension.
Bobbin Thread Tension Measuring Tool
a)Set bobbin case 1 in which a bobbin is placed in predeterminedposit6ion 2 as it is set in the hook. At this time, securely fit the
bobbin case until it clicks.
b)Pass the bobbin thread along the predetermined thread path in theorder of A. B & C.
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EQUIPMENT TECHNOLOGYc)Pull the thread in direction D. now read scale value 3 indicated on
the bobbin thread tension measuring tool. This is the bobbin thread
tension.
d) To adjust the bobbin thread tension, pass driver 4 in direction Euntil the top end of the driver reaches tension adjusting screw 5. Confirm
that the top end of the driver has reached the screw, adjust the bobbin
thread tension by turning the driver while pressing it. Turning the driver
in direction f will decrease the bobbin thread tension.
Pressure Adjusting Ruler
a)Set the Pressure adjusting ruler to the side of presser regulator.b)The scale value indicated on the ruler when the tongue 2 is pleased
on the top of presser spring regulator 1 , which is taken as
reference of the presser.
c)Loosen nut 3, & turn presser spring regulator 1 in direction A todecrease the presser foot presser.
Presser measuring jig
a)Set the Presser measuring jig in place taking screw 1 in thepresser foot as fulcrum. Now, confirm that support 2 is
securely fixed.
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EQUIPMENT TECHNOLOGYb)Turn the pulley to make the feed dog comes down under the
surface of the throat plate. Now ,put a bar tension gauge
c)( separately available) through loop of string 3 and slowly lift thetension gauge 4 in direction H. Read the scale value indicated ontension gauge when top end 5 of the presser foot is twice as high
as the scale value.
d)Refer to the description of the presser measuring jig for how toadjust the pressure of the presser foot.
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