Features, functions, parts, working principle and applications of a Blind stitch machine

1. CONTEXT :
• Introduction
• Blind stitch definition
• Features
• Types of blind stitch machines
• Technical Specification sheet
• Comparison sheet
• Parts
• Working principle
• Standard adjustments
• Application
• Disadvantages
• Safety measures
• Conclusion
SUBMITTED TO:
Mr. Chandramouli sir
SUBMITTED BY:
Gayathri Udhayakumar
(BFT/20/789)
Parinita Bhardwaj
(BFT/20/723)

2. • Blind stitch sewing machine for blind stitching is a special type of sewing
machine which is used in the garments industries to produce stitches is not
seen on the face side of the fabric is called blind stitch sewing machine.
Usually curved needle is used in this machine as it can penetrate in the
fabric partially.
• This machine is used for blind stitch hem and attaching the lining to the
waistband. Blind sewing machine stitches represent high quality and
perform equally well on light to heavy fabrics.

3. • A blind stitch in sewing is a method of joining two pieces of fabric so
that the stitch thread is invisible, or nearly invisible. Blind stitching
hides stitching under folded edges; therefore, this type of stitch can
be used to create a blind hem or to join two folded edges together.
• Blind hem stitches are completely hidden on the front of the garment
and almost completely hidden on the inside of the garment. The sewer
catches only a few threads of the fabric each time the needle is pulled
through the fabric, which means that the majority of the stitching is
hidden inside the hem.
• Blind stitching is useful when joining two folded edges together, as the
thread is only visible when the folded material is pulled away. This
technique allows the sewer to invisibly attach pockets, facings and
trimmings to a garment.
• A slip stitch or catch stitch can be used to create the blind stitch,
except that they are worked inside the hem, 1⁄8 to 1⁄4 inch (3.2 to
6.4 mm) away from the edge of the hem fabric.

4. •Off-stitch prevention: Off-stitch can be prevented because this is stepped part
detection type.
•Guide fix: table seam can be obtained and very beautiful sewing will result
because the blind-hemming guide is fixed securely with the solenoid during
sewing
•Easy guide operation: The blind-hemming guide is raised by pressing the knee
switch lightly and manual raising is unnecessary, and the beautiful sewing finish.
•Easy interchanging to plain sewing (with TC device only): When CH device
swings out frontward and the lever of TC device moves to plain sewing direction,
the tension changes from blind hemming to plain sewing and easy plain sewing is
possible.
•Easy cleaning: Swing-out type of CH device can be easy to clean the device.
More technical features are listed below :
•sewing speed is up to 3000 stitches/min
•Clearance between needle and looper point machine which can be easily lever
adjusted when changing the needle count.
•Fabric penetration by the curved needle is partial.

5. 1. BLIND STITCH - Blind stitch machine makes
a 1 thread stitch which on the face side of the
fabric appears to be hidden.
2. HAND ROLL BLIND STITCH - Hand roll Blind
stitch is a specialized machine designed to
produce a small rolled stitch on the edge of fabric
to resemble hand stitching such as is often found
on scarves.
3. LOCKSTITCH BLIND STITCH - Lockstitch Blind stitch machine
is similar to the Blind stitch machine except that it locks each
individual stitch, creating a stronger and more durable stitch. This
machine, with a top bobbin and curved needle is used to make
suit jacket seams.

6. SPECIFICATION
MODEL - CM-3 51/AT
CM- No. of Series
3 - Class Number (Standard class)
51 – Sub model by Application
AT - Devices (Automatic thread trimming device)

7. TECHNICAL SPECIFICATION
Stitch Specifications Single thread or double thread chain
stitch blind stitch
Speed Max. 1200 s.p.m.
Bed type Feed of the arm
Feed mechanism Elliptical feed
Presser foot Blind hem foot
Work aid movable table and presser foot
Stitch Length 3-8 mm
Skip Length No skip (1:1)
Stitches per inch 7
seam Super imposed
Stitch class 100 class
Stitch type chainstitch
Needle LW x 6T (Organ Needle Japan)
Motor Clutch (200 W.4 - poles) or AC / Servo-
Motor

8. Model No. of
needles
No. of
threads
Stitch
Length
Differential
Ratio
Presser
foot lift
Machine speed
(sti/min)
Applications Remarks
CM-352
1 Needle 1 Thread Chain Stitch Blind Stitch
Machine for Light to Medium Weight Fabric
with Skip Stitch Mechanism
1 1 3.2 - 8.5 - 10.0 3,000 For blind stitching in the
waist lines
CM-364
1 Needle 1 Thread Chain Stitch Blind Stitch
Machine with Differential Feed and Skip Stitch
Mechanism
1 1 3.2 - 8.5 1:1 - 1:1.5 10.0 3,000 For shirring / easing
operation on flare skirts /
bell bottom skirts and etc.
With Differential Feed and
Skip Stitch Mechanism
CM-355
1 Needle 1 Thread Chain Stitch Blind Stitch
Machine, for Bottom Hemming of Trousers
1 1 3.2 - 8.5 - 10.0 3,000 For Bottom Hemming of
Trousers
CM-356
1 Needle 1 Thread Chain Stitch Blind Stitch
Machine, for Lapel and Collar Padding
1 1 3.2 - 8.5 - 10.0 3,000 For Lapel and Collar
Padding

9. How Do You Use A Blind Stitch
On A Sewing Machine?
1.Press the raw edge by about ¼ inch or zigzag it
if you’re using a heavy fabric
2.Press the edge again by the seam allowance
and pin
3.Fold the hem backward, so you’ll be left with
around ⅛ inch of material poking out the edge
4.Select the blind stitch setting on the sewing
machine with the stitch set to 2 in width and
length
5.Remove the current foot and put in the blind
hem foot on the sewing machine
6.Place the fabric under the machine and align
the foot guide with the folded edge
7.Begin sewing as usual and then fold the hem
down to pull the stitches vertically

10. 1.Thread
2.Tension
3.Needle
4.Pressure feed
5.Stitch density
6.Looper.
1. NEEDLE
2. MOTOR
3. BELT
4. PRESSER FOOT
5. FEED DOG
6. LOOPER
7. SKIP STITCH SELECTOR
8. RIDGE FORMING REGULATOR

11. • Hold the fabric
• Keep feeding smoothly.
PRESSER FOOT
BLIND STITCH NEEDLE
• It is curve in shape in order to successively
penetrate partially into the fabric and then into the
hem edge.
• It is minimally shown on right side of the garment.
• Needle size:-LWx6T(11-18)
• A derivative of stitch type 101 is stitch type 103 known as single
thread Blind stitch or Blind hemming. The needle thread inter loops
with a blind looper on the surface of the material.
BLIND STITCH FORMATION

12. • It catches the loop form by needle thread
and help in forming stitch.
• It is situated above the bed of the machine
BLIND STITCH LOOPER
RIDGE FORMING REGULATOR
• To obtain desired depth of felling stitch
• A total of 12 thread guides.
• Thread tension should be as weak as possible without
loosing good balance of sewing.
THREADING
MOTION OF
FEED DOG :

13. The stitch produced by this machine in the
fabric is not shown from face side and so this is
called blind stitch machine. Usually curved
needle is used in this machine as it can
penetrate in the fabric partially. The needle
comes out from the side of the fabric through
which it penetrated. Again in maximum blind
stitch machine optional skip device is attested
by which it is possible to penetrate the outside
layer after one or two stitch. The speed of this
type of machine is up to 2500 SPM and the
stitch length can be 3 to 8 mm long. Usually
one thread is used to make the stitch but two
threads may also be used. In case of two
threads blind stitch, it is safe from opening.
Mainly for attaching hemming or facing this
machine is used.

15. How Do You Use A Blind Stitch
Sewing Machine?
1.Refer to the manual of the specific blind stitch
sewing machine you have
2.Turn on the motor and power switch
3.Fold the cloth in two and insert it into the
blind-hemming guide of the machine
4.Pull the guide down horizontally and raise the
presser foot
5.Place the fabric under the foot, then lower the
foot to secure it for sewing
6.The blind-hemming guide on the machine will
be fixed with the solenoid, so when the stepped
part passes through it, the slide edge guide will
move to the right
7.Push the knee switch to raise the blind-
hemming guide when the starting point is
getting near to the guide
8.Finish your stitches

16. •Adjust the differential feeding amount depending on a fabric.
•To set the blind-hemming edge guide as standard, align the left side of
the slide edge guide with that of the needle
•Loosen the adjusting lever (1) and turn the adjusting screw depending
on the stitch depth.
•To make the stitch deep, turn the adjusting screw (2) towards right.
•To make the stitch shallow, turn the adjusting screw (2) to the left.
•After setting the blind-hemming edge guide, fix the adjusting level (1)
•Make the standard height of the blind-hemming edge (3) 2mm above
the top of the cloth plate. Loosen the screw (4) to adjust the height to
feed a heavy weight fabric smoothly.
•Loosen the screw (5) and move the hemming positioner (6) right or left
to adjust the hemming width.

17. • Blind stitching hides stitching under folded
edges; therefore, this type of stitch can be
used to create a blind hem or to join two
folded edges together
• For sewing all types of light to medium-
weight materials including synthetics, knits
and woollens.
• Typical sewing operations include pant
cuffs, felling slack bottoms, hemming
dresses, skirt and coat bottoms, draperies,
negligees, undergarments, lapel padding,
blouses and sleeves.
• Ideal for alteration rooms, clothing rentals,
dry cleaners, department stores,
dressmakers and home use.

18. 1. It uses a bobbin to provide the lower thread.
2. Bobbin can only contain a limited length of that thread.
3. Running out of thread is very poor, where a join is
visually unacceptable.
4. Major problems occur on bobbin running, which involved
loss of stitching.
5. Unsuitability for edge neatening.

19. • This machine can only be used for the blind stich
purpose.
• Other uses of this machine are not allowed. Any
modification or conversion made on this machine must
be conformed with the safety standards and
regulations. Precaution is necessary.
• For the safety of operators and services persons,
please don’t open the cover of any electronic control
boxes of the motor or other devices and don’t touch
any components inside to avoid electrical shock
hazards.
• Please never operate this machine without belt cover,
figure guard or any safety devices to avoid physical
injury.

20. Blind stitch machine is one of the important sewing
machines in garment factory of making a complete
garment. This type of machine cannot be used for
normal purpose. But for making a complete garment
their importance cannot be denied. Special care and
sufficient knowledge is necessary for proper working.
Otherwise faulty sewing may be done.

21. THANK YOU