Singer 246K21 User manual

Form K6330
(558)
Supplement to Form K6195
SERVICE MANUAL
FOR
SINGER
SEWING MACHINE
246K21
REVISED DESCRIPTION FOR 246K20 MACHINE
Machine 246K20 has two needles and two loopers and is fitted with a
trimmer for simultaneously trimming and ovcredging bathing suits, house
dresses and similar articles. It makes a strong four-thread chain stiteh
consisting of oyeredge stitching and a single line of reinforcing stitching
running parallel and close to the ovcredging on the upper side of the fabric.
Clearance under presser foot is 1/4 inch.
Needle gauges are .109 (7/64) inch and 1/16 inch. Unless otherwise
ordered, the machine will be furnished with needle gauge of .109 inch.
The machine is equipped with a small "horn" beneath the throat plate to
aid ID tubular work.
The trimmer can he adjusted to trim from 3/32 inch to 7/32 inch from the
needles. The knife trims ahead of the needles.
The machine can be fitted for a bight from 3/32 inch to 5/32 inch, depend
ing upon the material and the thread in use.
... t'le machine is regularly furnished with a foot lifter, a knee
lifter wll be furnished instead, when specified on order.
The presser foot can be readily thrown out of operaliiu' jio.sition to
prevent interference when threading the machine or replacing the needles.
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The elotli plate can be swung out 170° to the left of the needles, to facilitate
adjustment of tlie machine.
The loopers are independently driven, permitting variations in their
adjustment in relation to each other and to the needles, to suit the work
being sewn.
The Splash lubricating system automatically and continuously oils the
principal ])carings, during the operation of the machine. This oiling system
also includes an oil sight gauge in the front of the machine, to indicate the
oil level to the operator, and an oil cooling tank in the rear of the machine.
Sec X-Ray view of machine on pages 12 and 13 Form K6195.
Thread Unwinder Complete 151163 is regularly furnished with the machine.
Machine Pulley 164231, for 3/8 inch V-belt, furnished with the machine,
may also be used for 5/16 inch round belt.
246K21 MACHINE
Machine 246K21 is similar to Machine 246K20 except that it has a greater
looper stroke and astraight top knife.
The iniichine is designed for trimming and ovcrcdging medium and
medium heavy fabrics.
The distance between the two needles is fixed at .109 inch.
NEEDLES AND THREAD
NOTE t Distance between needles on 246K20 Machine can be
.109 inch or 1/16 inch as requested. Machine 246K21
has this distance fixed at .109 inch only.
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TO SET THE FEED DOGS AT THE CORRECT HEIGHT
(Page 15)
Gauge 164883 tiiiperscdcs 164460.
10 SET THE NEEDLE CARRIER AT THE CORRECT HEIGHT
(Page 16)
Gauge 164883 supersedes 164460
TO SET
THE LEFT LOOPER IN RELATION TO THE NEEDLES
(Page 18)
Gauge 164883 supersedes 164460.
TO SET THE RIGHT LOOPER IN RELATION TO THE NEEDLES
(Page 19)
Gauge 164883 supersedes 164460
From the library of: Superior Sewing Machine & Supply LLC

TO ADJUST THE STATIONARY KNIFE FOR WIDTH OF BIGHT
K4862
L6 F6 G6
Fig. 29. Adjusting Width of Bight.
The position of the trimmers in relation to the needles determines the
width of bi<jht. To adjust, loosen the screw A6, Fig. 29, and move the
movable knife holder B6, Fig. 29, to the right. Then loosen the screw C6,
Fig. 29, and move the stationary knife holder D6, Fig. 29, to the left or right
as rci]uircd. Securely tighten the screw C6. Now with the eiitting edge of
the movable knife E6, Fig. 30, at its lowest position, i.e., slightly below the
rutting edge of the stationary knife F6, Fig. 29, move the knife holder B6,
Fig. 29, to the left against the stationary knife F6. Tighten the screw A6,
Fig. 29. Contact pressure between the stationary knife and the movable
knife is adjusted tinder '"To Replace the Movable Knife", page 6.
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M6 M7
Fig. 30. Adjusting the Trimmer.
TO REMOVE THE STATIONARY KNIFE
To remove the stationary knife F6, Fig. 29, loosen the clamping screw
G6, Fig. 29, and draw the knife F6 upward and out.
TO REPLACE THE STATIONARY KNIFE
To replace the stationary knife F6, Fig. 29, push the knife down into the
knife hohler D6, Fig. 29, until the cutting edge is flush with the top of the
throat plate H6, Fig. 30. Tighten Screw G6, Fig. 29.
TO REMOVE THE MOVABLE KNIFE
To remove the movahic knife E6, Fig. 30, remove the clamping si-rew A6,
Fig. 29, and the knife holder B6, Fig. 29. Then loosen tiic screw K6, Fig. 29,
and withdraw the knife E6.
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TO REPLACE THE MOVABLE KNIFE
To replace the movable knife E6, Fig. 30, insert the knife into the knife
holder B6, Fig. 29, and tighten scrc\v K6, Fig. 29. Replace tlic knife holder
B6 and the clamping screw A6, Fig. 29, and move the knife holder to the left
until the movable knife E6 contacts the stationary knife F6, Fig. 29. Tighten
clamping screw A6.
Turn the machine pulley over from yon until the movable knife E6,
Fig. 30, is at the lowest point of its stroke. In this position loosen the screw
K6, Fig. 29, and raise or lower the knife E6 until the highest point of its
bevelled cutting edge is just below the cutting edge of the stationary knife
F6, Fig. 29.
Tighten the screw K6. Now loosen the screw C6, Fig. 29,
sufficiently to release the spring behind the stationary knife holder D6,
Fig. 29, permitting the stationary knife F6 to make tight spring contact
with tlte movable knife E6. Securely tighten the set screw 06.
With the movable knife E6, Fig. 30 at the lowest point of its stroke, cheek
alignment of knives E6 and F6. Should the cutting edges of the knives gape
at their forward ends (point nearest operator) loosen the screws L6 and C6,
Fig. 29 and M6, Fig. 30. Then turn in screw M7, Fig. 30 until the cutting
edges are correctly aligned. Tighten the screws M6, L6 and €6 in this order.
Verify alignment of knives.
Should the cutting edges gape at their rear ends (point away from oper
ator) rci)cat the above instructions but reverse the procedure with screws
M6 and M7, Fig. 30, i.e., loosen screw M7 and turn in screw M6 until correct
alignment of knives has been obtained, then tighten screw M7.
THE SINGER MANUFACTURING COMPANY
•A Trade Mark of THE SINGER MANUFACTURING COMPANY
All Rights Reserved. Printed in Great Britain
From the library of: Superior Sewing Machine & Supply LLC