Merrow Class 70 - Merrow Class 70 Needle; Class 70 Needle Types and Selection; Merrow Class 70 Needle Carrier; Class 70 Needle Carrier Adjustment

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
THE MERROW MACHINE COMPANY ________________ _
NEED LE
25. 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 lhe finest generally used. Special needles in some of the
above mentioned
sizes are available for special uses.
26. Set the Needle into the Needle Carrier so that the end of the shank of the Needle is in con-
tact 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.
27. 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.
THE NEEDLE CARRIER
28. The Needle Carrier Assembly must be perfectly free lo swing upon its stud but must have
no
latera l movement. This adjustment is accomplished by first loosening the Needl e-Carrier-
Stud-Set- Screw 8-7/32 which is located in the frame of the machine, directly back of and below
the center of the Needle Carrier Stud, and accessible from the outside rear of the machine . If
the loosening of this screw is neglected in a single instance, the machine will be injured.
29. 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
30. The needle slot in the Needle Pl ate must always be large enough to permit the blade of the
n eedle 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 pl aces
on the chaining finger or working surface of the Needle Plate.
31. The needle plate must match the feeding parts.
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