Brother 884-B31 Manuais de operação - Página 12

Procurar online ou descarregar pdf Manuais de operação para Máquina de costura Brother 884-B31. Brother 884-B31 36 páginas. Cover stitch machine / top cover stitch machine

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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>

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

Differential

(rear)

feed (front)

Less than

1.0

Greater

than 1.0

Effect

Application

Material is

Prevents thin

pulled tight.

materials

from

puckering

Without

Normal

differential

sewing

feed.

Material is

Prevents

gathered

stretch

or pushed

materials

together.

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>

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.