| SEWING | CUTTING | FEEDING |
| Needles | General information | Feed dogs |
| Loopers | Knife adjustment | Presser foot |
| Threaading diagrams | Sharpening the cutters | Framecap assembly/Cams |
NEEDLE
1) Self-setting Needles marked “D”,
used on the Class 70 are of the following sizes: No.’s 3D,
4D, 5D, 6DT, 7DT, 8D, and No. 8SD, all have straight shanks, flattened
at one side and curved blades, the No. 3D being the finest generally
used. Special Needles in some of the above mentioned sizes are available
for special uses.
2) Set the Needle into the Needle Carrier so that the end of the shank of the Needle is in contact with the Stop Pin 36-6 at the rear of the Needle Carrier, and tighten the Needle Clamp Nut 4-3/16 with the Socket Wrench (44-2), firmly but not unduly. The beveled portion of this Needle Clamp Nut 4-3/16 should be against the recess provided, therefore, in the Needle Carrier Collar.
3) A Needle as large as practical for the work being accomplished should be used, but care should be taken that the slot in the Needle Plate is large enough to accommodate the needle.
NEEDLE CARRIER ASSEMBLY
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5) Screw the Needle Carrier Stud in or out very delicately until the proper adjustment is attained and then tighten the Needle-Carrier Stud-Set-Screw 8-7/32 and test the Needle Carrier again.
NEEDLE PLATE
6) The Needle Slot in the Needle Plate must always
be large enough to permit the blade of the Needle to pass freely
without contact with the Needle Plate. The edges of this slot should
be quite square but smooth and only slightly rounded. Be sure there
are no burrs or rough places on the chaining finger or working surface
of the Needle Plate.
7) The Needle Plate must match the feeding parts.
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