Merrow Class 70 - Merrow Class 70 Feeding Mechanism; Class 70 Feed Dog and Mechanism Adjustment

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
THE MERROW MACHINE COMPANY ________________ _
FEEDING
MECHANISM
57. Feed Dogs are provided with either fine cut teeth or coarse cut teeth, single row or double
row, dependent upon
the work. Generally the feed dogs should be set as low as practical.
58. The length of feed can be changed by removing the Feed Eccentric and substituting another
Feed Eccentric of different throw. Feed Eccentrics are marked to indicate approximately the
number of stitches per inch produced at the edge of the fabric.
59. Feed Dogs and Needle Plates must match each other.
60. The letter "D" in the Style 70-D3B or 70-ABBD means it contains a differential or
gathering feed. The differential contains two separate Feed Dogs with their separate Feed
Carriers and separate Feed Eccentrics. When it is desired to prevent the edge of the fabric
from being stretched or lengthened while seaming, the Front Feed Dog is made to travel a
greater distance than the Rear Feed Dog. In most cases, a slight difference is sufficient and
the number of each Feed Eccentric and the difference between the two is dependent upon the
number of stitches required per inch and th e elasticity of the fabric itself.
61. On certain fabrics it may be desirable to tilt the Feed Mechanism . To make this adjust-
ment, loosen the Set Screw 48-5 / 32, slowly turn the F.C. Block Pin to the desired location
and tighten this Set Screw. When the screw slot in the pin is level with the base of the
machine, the Feed Dog will be in their standard level position. It is never necessary to
remove the Stop Screw 48-5 / 32. This leveling device on the feed mechanism permits delicate
adjustment of feed dogs .
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