Technical Manual: Decorative/Overedge & Hosiery

M and MG Class Machine – Feeding Mechanism

Feed Dogs

1) Feed Dogs are normally provided with either coarse or fine cut teeth, single row or double row, depending on the material you are sewing. Generally, the Feed Dogs should be set as low as practical to allow the work to feed. The length of feed can be changed by removing the Feed Eccentric and substituting an eccentric of shorter or longer stroke. Feed Eccentrics (6-82-#) are marked to indicate approximately the number of stitches per inch produced at the edge of the fabric.

2) The Feed Dog and Needle Plate must match each other and it may be necessary to change Feed Dogs to prevent interference with the Needle Plate when very few stitches per inch are used.

3) Machines designated by the letter “D” in the style marking contain a differential or gathering feed. The differential feed contains two separate Feed Dogs, with separate Feed Carriers and separate Feed Eccentrics. This separation allows the front Feed Dog to be set up to travel farther than the rear Feed Dog. This gathers the fabric and prevents it from being stretched or lengthened while it is being sewn. The difference in the throw of the two Feed Eccentrics creates the “differential” feed. The difference between the two can be very little or quite large depending on the number of stitches per inch you desire and on the elasticity (stretch) of the fabric.

4) On certain fabrics it may be desirable to tilt the Feed Mechanism. To make this adjustment loosen the Set Screw 48 5/32, then slowly turn the Feed Carrier Block Pin to the desired location and tighten the set screw. When the screw slot in the F.C. Block Pin is level with the base of the machine, the feed dogs will be in their standard position. It is never necessary to remove the Set Screw 48 5/32.

Presser Foot and Presser Foot Finger

5) The center hinged type Presser Foot is generally used since it is convenient for seaming or edging where seams or thick and thin places must be crossed. Rigid and rear hinged type Presser Feet are available for special purposes. After lifting the Presser Foot Latch, the Presser Foot Arm with its Presser Foot may be swung out to provide access to the Needle and Loopers.
6) A “stub” or short Presser Foot Finger is used if the machine is equipped with a Needle Plate with a chaining finger. A long P.F. Finger is used with a Needle Plate with a stub or short chaining finger. The finger guards the right side of the Needle. This should be adjusted sideways so that the left hand edge of the finger (next to the Needle) just clears the Needle when the Needle is in the full down position.
7) Ordinarily, use as little pressure on the Presser Foot as possible. This pressure is adjustable by the Screw 6 3/8. A set Screw 13 5/32 holds Screw 6 3/8 in position so your adjustment does not change while the machine is running.

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