Brother International CV3440 Operation Manual - Page 12

Stitch length, Differential feed

Get Brother International CV3440 PDF manuals and user guides View all Brother International CV3440 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 12 highlights

Stitch length The normal stitch length setting is 3 mm. To change the stitch length, turn the stitch length adjustment dial on the right side of the machine. a b The normal setting is 1.0 on the differential feed adjustment dial. To adjust the differential feed, turn the dial on the lower-right side of the machine. a b 1 Shorten the stitch length to a minimum of 2 mm (5/64 inch). 2 Lengthen the stitch to a maximum of 4 mm (5/32 inch). Selection mark Differential feed There are two sets of feed dogs under the presser foot to move the fabric through the machine. The differential feed controls the movement of both the front and the rear feed dogs. When set at 1, the feed dogs are moving at the same speed (ratio of 1). When the differential feed ratio is set at less than 1, the front feed dogs move less than the rear feed dogs, stretching the fabric as it is sewn. This is effective on lightweight fabric that may pucker. When the differential feed ratio is set at greater than 1, the front feed dogs move more than the rear feed dogs, gathering the fabric as it is sewn. This function assists in removing rippling when sewing stretch fabrics. „„Differential feed adjustment Feed ratio Main feed Differential Effect Application (rear) feed (front) Less than 1.0 Material is Prevents thin pulled tight. materials from puckering Without Normal 1.0 differential sewing feed. Greater than 1.0 Material is gathered or pushed together. Prevents stretch materials from stretching or puckering 1 Less than 1.0 2 Greater than 1.0 Selection mark An example When stretch material is sewn without using the differential feed, the fabric will be wavy. To get a smooth finish, adjust the feed ratio from 1.0 toward 2.0. (The feed ratio required depends on the elasticity of the material.) The more elastic the material, the further toward 2.0 the differential feed ratio should be set. Test sew with a scrap of the fabric to find the correct adjustment. CAUTION When sewing thick non-stretchable material such as denim, do not use the differential feed as it may damage the fabric. 10

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
10
Stitch length
The normal stitch length setting is 3 mm. To
change the stitch length, turn the stitch length
adjustment dial on the right side of the machine.
<A>
a
b
1
Shorten the stitch length to a minimum of 2 mm (5/64 inch).
2
Lengthen the stitch to a maximum of 4 mm (5/32 inch).
<A> Selection mark
Differential feed
There are two sets of feed dogs under the presser
foot to move the fabric through the machine. The
differential feed controls the movement of both the
front and the rear feed dogs. When set at 1, the
feed dogs are moving at the same speed (ratio of 1).
When the differential feed ratio is set at less than
1, the front feed dogs move less than the rear
feed dogs, stretching the fabric as it is sewn. This
is effective on lightweight fabric that may pucker.
When the differential feed ratio is set at greater
than 1, the front feed dogs move more than the
rear feed dogs, gathering the fabric as it is sewn.
This function assists in removing rippling when
sewing stretch fabrics.
±
Differential feed adjustment
Feed ratio
Main feed
(rear)
Differential
feed (front)
Effect
Application
Less than
1.0
Material is
pulled tight.
Prevents thin
materials
from
puckering
1.0
Without
differential
feed.
Normal
sewing
Greater
than 1.0
Material is
gathered
or pushed
together.
Prevents
stretch
materials
from
stretching or
puckering
The normal setting is 1.0 on the differential feed
adjustment dial.
To adjust the differential feed, turn the dial on the
lower-right side of the machine.
<A>
a
b
1
Less than 1.0
2
Greater than 1.0
<A> Selection mark
An example
When stretch material is sewn without using the
differential feed, the fabric will be wavy.
To get a smooth finish, adjust the feed ratio from 1.0
toward 2.0.
(The feed ratio required depends on the elasticity
of the material.)
The more elastic the material, the further toward
2.0 the differential feed ratio should be set. Test
sew with a scrap of the fabric to find the correct
adjustment.
CAUTION
When sewing thick non-stretchable material such
as denim, do not use the differential feed as it may
damage the fabric.