Needlebar Rock Frame Rockshaft

(At this point, the machine is placed in an upright position.) Place the needlebar rock frame rockshaft in the lower bushing in the face of the machine. Push it through until the end of the shaft is flush with the bushing in the arm of the machine. This may be viewed through the opening in the top of the machine arm. Place the screwdriver through the opening in the right side of the machine arm and engage the needlebar rock frame rockshaft crank. Lift the crank with the screwdriver so that it is on line with the needlebar rock frame rockshaft. With the left hand, push the rockshaft through the crank. Do not tighten the crank.

Arm Shaft

In replacing the arm shaft, be certain that the needlebar crank friction washer is on the shaft. Insert the arm shaft in the top bushing in the face of the machine; then push it through until it can be seen through the opening located on the rear of the machine arm.

Presser-Lifting Eccentric Connection Link

Insert the larger end of the presser-lifting eccentric connection link (figure 4-10A) with the oil holes facing up. Slowly push the arm shaft through the arm of the machine until you can see the arm shaft at the opening on the top of the machine nearest the balance wheel.

Presser-Lifting Eccentric

Place the presser-lifting eccentric (figure 4-10B) onto the arm shaft with the small end toward the face of the machine. At this time, slide the presser-lifting eccentric toward the face until it goes inside the connecting link.

Feed Indicator Disc

The feed indicator disc is placed on the arm shaft, through the opening in the top of the machine arm, so that the numbers on the disc may be read right side up. Push the arm shaft through the disc about 1 inch.

Arm Shaft Pulley and Arm Shaft Connection Belt

The arm shaft connection belt acts as a sling for the arm shaft pulley. Use the belt and lower the pulley through the opening in the top of the machine arm. Now turn the belt, while aligning the pulley with the arm shaft, and insert the shaft through the pulley. Be sure you push the shaft through as far as it will go.

Arm Shaft Connection Belt Pulley Position Screw

To replace the arm shaft connection belt pulley position screw, you hold the arm shaft in position with the left hand and move the arm shaft pulley to the left. Turn the arm shaft until the hole is facing up. Now turn the pulley until the hole for the position screw is facing up. Move the pulley to the right, aligning the two holes, and insert the position screw. Tighten the remaining setscrew in the pulley.

Balance Wheel

Before you replace the balance wheel, turn the arm shaft until the groove in the shaft is facing upward. Place the balance wheel on the arm shaft. Now turn the wheel toward the operator until the second screw is directly in line with the groove. Tighten the screw in place. Tighten the remaining setscrew.

Balance Wheel Adjusting Screw

Place the balance wheel adjusting screw in the end of the arm shaft and tighten it. Loosen it onequarter turn and strike it with a sharp blow using a rawhide mallet. See that the balance wheel turns freely and that there is no play. If the balance wheel does not turn, or if it turns and there is side-to-side play, repeat the procedure.

CAUTION

This balance wheel is made of cast iron or aluminum and will break if you hit it directly with the mallet.

If the screw can be removed by using your thumb and forefinger, it will be necessary to spread the end of the screw. To do this, remove the screw and spread the end of it with a screwdriver. Replace the screw and run it down until it touches the balance wheel. It should then be tightened snugly when you try to remove it with your fingers.

Alternating Presser Driving Rockshaft

Slide the rockshaft into the rear of the machine through the two bushings. Attach the presserlifting link crank to the link projecting from the arm. Continue sliding the rockshaft through the crank. Set the machine on its balance wheel end. Install the bell crank link on the rockshaft stud (oil holes up). Install the oil guard into the face at this time.

Needlebar Connecting Link

Turn the balance wheel until the needlebar connecting link stud is at its lowest position. Grasp the needlebar connecting link so that the double cylinders are up. Place the larger of the two cylinders over the needlebar connecting link stud, and ensure that the flush end of the cylinders are facing outward.

Take-up Lever Driving Stud

Place the cylinder of the take-up lever driving stud over the piston of the take-up lever.

Take-up Lever

Grasp the take-up lever with the piston of the take-up lever driving stud and the cylinder of the take-up lever facing the face of the machine. Fit the lever into the slot designed for its operation; at the same time insert the take-up lever driving stud into the remaining cylinder of the needlebar connecting link.

Thread Take-up Lever Hinge Stud

Align the cylinder of the thread take-up lever with the recess for the hinge stud. Before you insert the hinge stud, turn the hinge stud and note the flat machined surface running the length of the stud. Replace the stud with the machined surface up. Install the setscrew.

Needlebar Rock Frame Assembly

Hold the needlebar rock frame in the left hand with the rounded end up and the straight side facing left. Insert the slide block in the space provided with the oil hole facing up.

Before you insert the needlebar rock frame assembly, turn the balance wheel until the needlebar connecting link is at its lowest position. Insert the assembly into the face of the machine so that the connecting stud enters the connecting link and the slide block is placed over the projection on the needlebar rock frame rockshaft. At the same time, the vibrating presser barspring guide rod with the spring attached must be positioned into the hole at the top of the face. Hold the assembly in position.

While you are holding the assembly in position, insert the hinge stud so that the flat surface is up. Install and tighten the setscrew.

Install the needlebar rock frame. Position bracket in position and tighten it in place.

Thread Tension Release Lever Rod

Insert the thread tension release lever rod in the hole in the back of the machine head so that the rounded end is facing toward the operator.

Presser Bar

Insert the presser bar through the upper bushing located in the top of the machine head, about 3 1/2 inches. Place the presser bar position bar guide lever so that the pinch screw is to the rear and the arm is to the left. At this time the lifting-and-releasing unit must be installed. It consists of a lifting bracket, a releasing bracket, and a spring that separates the two parts. While you are holding the unit together, place it into the face so that the two long levers cover the releasing rod. Now twist the presser bar down through the unit. Before you lower the presser bar through the lower bushing, insert the presser bar spring bracket with the slot up. Lower the presser bar through the lower bushing. Turn it so that the 4-30 unthreaded end of the hole faces left. Insert the presser foot in the slot. Replace the screw and tighten it.

Presser Bar Position Guide

Place the slotted end of the presser bar position guide through the opening in the top of the machine head so that it fits over the arm of the presser bar position guide lever. When you complete this step, the top of the presser bar position guide will be flush with the top of the machine head. Tighten the spline screw in the rear of the head.