Singer 281-1 Service Manual

Regulation View —Mochine 281-1 THE SINGER COMPANY Copyright © 1964 by The Singer Company Copyright Under International Copyright Union All Rights Reserved under Inter-Amerlcon Copyright Union *A Trodetnork of THE SINCER COMPANY Printed In U. S. A. From the library of: Superior Sewing Machine & Supply LLC

4, 5 OPERATION 4, 9 ADJUSTMENT 10, 16 PARTS Rear of Manual INDEX Bobbin, Removal and Replacement 8 Bobbin Case, Removal and Replacement 8 Bobbin Case, Threading 8 Bobbin Cose Holder, Removol and Replacement 13 Centralizing the Feed Dog 15, 16 Check Spring, Height Setting,... 14 Check Spring, Tension Adjustment 14 Check Spring, Timing 14 Cleaning 6, 13 Description of Machines 3 Determining Thread Twist 7 Disc Tension 3 Federal Stitch Type 3 Feed Bar Eccentric Hinge Pin 14, 15 Feed Bar Linkage 16 Feed Dog, Centralizing 15, 16 Feed Dog, Height Settings 14, 15 Feed Eccentric Stop Screws Available 15 Feed Leveling 15 Feed, Pendant Link 3 Filter (Sewing Hook Lubrication) 5 Guard, Needle. 13 Guard, Needle Thread 3 Guide Bracket 16 Hook (see Sewing Hook) Hook Section 13 Installation 4 Knee Lifter 3, 4 Length of Stitch 3, 9, 10 Leveling the Feed IS Lifting Bracket 16 Lint Wiper 3 Lower Threading 8 Lubricating System 3-5 Lubricotion 4, 5 Machine Base 4 Machine Pulley ^ Magnet on Oil Pump 6 Materials Sewn 3 Maximum Stitch Length 3, 15 Needle Bar Bushing (Lower), Setting 10 Needle Bar Height, Setting 10 Needle Bar Stroke 3 Needle Clearance with Hook, Setting 11. 12 Needle Guard at Loop-taking Time.. 13 Needle Guard, Stringing 13 TO ALL WHOM IT MAY CONCERN: Needle Recommended .......6 Needle, Setting 6, 7 Needle Stop 10 Needle Thread Guard 3 Needle Threading 7 Oil Flow Regulator 5 Oil Flow Window. 3, 5 Oil Pump 3, 6 Oil Recommendations 5 Oil Reservoir 3, 4 Oil Retaining Collor 11 Oil Spray Pattern 5 Parts Charts Rear of Manual Pendont Link Feed 3 Presser Bar Height, Setting 16 Presser Bar Lift.. 3, 16 Presser Foot Clearance 16 Presser Foot Pressure, Adjustment 9 Preventing Unauthorized Changes in Stitch Length 10 Position Finger, Settings 12 Radial Position of Sewing Hook 11 Regulator Button (Stitch Length) 9, 10 Reservoir 3, 4 Sewing Hook Clearance with Needle, Setting 11, 12 Sewing Hook Filter Screw 5 Sewing Hook Lubrication 5 Sewing Hook, Oiling Wick 5 Sewing Hook, Timing 11 Space at Right of Needle 3 Speed Recommendotions 6 Stitch Length, Maximum 3, 15 Stitch Length, Preventing Unauthorized Changes 10 Stitch Length, Regulation 9, 10 Stop Screws (Feed Eccentric) 16 Stringing the Needle Guard 12 Take-up Lever Movement 14 Tension of Check Spring, Adjustment 14 Thread 7 Threoding, Lower 8 Threading, Upper 7 Thread Tensions.... 9 Timing 11,14 Thread Twist, Determination 7 Upper Threading .7 Unauthorized Changes in Stitch Length, Preventing 10 V-belt 3 Wick, Sewing Hook 5 The improper placing or renewal of the Trodemork SINGER* or any other of the Trodemorks of The Singer Company (all of which ore duly Registered Trademarks) on any machine that has been repaired, rebuilt, reconditioned, or altered in ony way whatsoever outside a SINGER factory or on authorized SINGER agency is forbidden. From the library of: Superior Sewing Machine & Supply LLC

Machines 281-1, 281-3 and 281-21 are high speed, single needle, lockstitch machines designed for sewing a wide variety of fabrics ranging from light weight to heavy weight. Outstanding straight line stitching is produced by these machines in materials such as wash-and-wear, synthetic and natural fabrics. General Features Balanced, air cooled, rotating hook. Horizontal axis. Lint wiper keeps lint and abrasive matter from ac cumulating on hook. Drop feed consisting of pendant link feed with feed leveling hinge pin. Pendant link feed mechanism maintains longer feed ing cycle. Three plain superfinished bearings support the arm shaft. Fully automatic lubricating system with oil flow window in direct view of operator. Knee lifter mechanism integral with machine base and oiI reservoir. independent light fixture mount. Federal stitch type 301. Improved needle thread guard and other thread hand ling parts. Disc tension. Machinepulley 147139 for 3/8 inch V-belt. Variations of Machine Varieties Machine 281-1 Light weight to medium-heavy weight fabrics. Needle bar stroke, 1-13/64 inches. Presserbor lift, 5/16 inch. Maximum stitch length: Feed eccentric stop screw, regularly furnished, limits the maximum stitch length to 7 stitches per inch. A stop screw for 5-1/2 stitches per inch will be furnished when specified on order. Space at right of needle, 11 inches. Machine 281-3 Light weight to extra-heavy weight fabrics. Needle bar stroke, 1-7/16 inches. Presser bar lift: Regularly furnished with 3/8 inch lift for sewing light weight to heavy weight fabrics. Available on order with 7/16 inch lift for sewing extra-heavy weight fabrics. Maximum stitch length, 5-1/2 stitches per inch. Space at right of needle, 11 inches. Machine 281-21 Light weight to medium-heavy weight fabrics. Needle bar stroke, 1-13/64 inches. Presser bar lift, 9/32 inch. Maximum stitch length: Feed eccentric stop screw, regularly furnished, limits the maximum stitch length to 7 stitches per inch. A stop screw for 5-1/2 stitches per inch will be furnished when specified on order. Space at right of needle, 8 inches. From the library of: Superior Sewing Machine & Supply LLC

See that plunger is in place, as shown in Fig. 2, Use shims on corners, when required to insure that before placing machine on base, base is level, so that oil level will be accurately in dicated by marks on bose. Machine base and oil reservoir fits into standard table cut-out and rests on four corners without bolting. Machine head is not fastened but should rest on cork Rasp edges of cut-out, shown in Fig. 2, if necessary, gasket in base. Machine hinge pins must not support so that machine does not touch table when placed on the head except when machine is tilted back, base. STOP SCREW LOCK NUT ROCK SHAFT CLAMP SCREWS LIFTER LEVER REAR STOP DOG KNEE PLATE Fig. 3, Knee Lifter THEKNEE LIFTER Knee lifter is shipped assembled to the base ex cept for the knee plate and lifter lever. Loosen the two clamp screws shown in Fig. 3 and slide the rock shaft forward to position shown. Attach, lifter lever. Set the stop screw, Fig. 3, so that there is only a little play in the lever before it starts to lift the presser bar. Then tighten lock nut on stop screw. Set the rear stop dog to allow the presser bar to be raised to its limit and tighten the two clamp screws. CAUTION: Do not operate machine until it has been thoroughly lubricated in accordance with the following instructions. From the library of: Superior Sewing Machine & Supply LLC

filled to HIGH MARK shown in Fig. 2 Use SINGER OIL "TYPE A" or "TYPE C", Use "TYPE C" OIL when an oil is desired which will produce a minimum of stain on fabrics even after a long period of storage. Do not use additives in sewing machine oil, as they may cause a reduction in normal oil flow that can result in damage to machine. Should the oil flow, passing through the oil flow window as shown in Fig. 4, stop or become erratic, STOP MACHINE AND DO NOT RUN AGAIN until the cause has been eliminated. Check oil level often to keep it from going below low mark. The Oil Flow Regulator Lubrication of the sewing hook is automatically controlled by the oil flow regulator shown in Fig. 5. Regulator is set at the factory for lubrication under average sewing conditions. To determine whether oil is properly flowing to the hook, run machine for approximately one minute to es tablish a uniform rote of flow. Then open the bed slide, hold a piece of paper under the hook and run the ma chine for about ten seconds. There should be a distinct line of oil on paper, beneath the hook bearing, with a fine spray on each side of this line. If there is no trace of oil or an excess of oil on the paper, turn oil flow regulator to right or left to increase or decrease the flow of oil, as shown in Fig. 5. Machine must run at least one minute between ad justments to insure uniform oil flow. If the proper rote of flow cannot be obtained by turning the regulator inspect the oil flow mechanism as follows: Remove needle, bobbin and bobbin case from ma chine. Remove bracket screw and position finger shown in Fig. 5. Loosen two hook body screws and turn machine pulley until feed bar reaches its highest point. SHOULD SHOW STEADY FLOW OF OIL Fig. 4. Oil Flow Window THREAD GUARD HOOK BODY SCREWS FEED BAR POSITION FINGER tT BRACKET SCREW OIL FLOW REGULATOR Fig. 5. Oil Flow Regulotor SEWING HOOK OIL FLOW REGULATOR ojA 14 3. / / 'f/V FILTER SCREW WICK Fig. 6. Sewing Hook Filter Screw and Wick Turn the sewing hook until thread guard is at the bottom as shown in Fig. 5 and slide hook from shaft. Loosen filter screw shown in Fig. 6 and check to see if wick has become detached or clogged. Inspect all passages for dirt and lint accumulation. Replace wick if necessary. Assemble sewing hook and position finger to ma chine. Re-check oil flow as previously instructed. From the library of: Superior Sewing Machine & Supply LLC

Tilt machine back on hinges. Wrap clean rag around other sharp instrument), remove lint and other waste magnet, shown in Fig. 7, on oil pump body and pul from around sewing hook, from between feed rows and accumulated foreign particles from magnet. underside of throat plate and from all other operating points. CLEAN Wipe exterior of machine dry with a soft cloth. MAGNET Fig. 7. Magnet on Oil Pump Body SPEED Maximum speed for machine 281-1 and 281-21 is 6000 stitches per minute. Maximum speed for Machine 281-3 is 5000 stitches per minute. It is advisable to operate new machines at a speed of 500 stitches less than maximum, for the first 100 hours of operation. NEEDLES Machines 281-1 and 281-3 Use SINGER* Needle, Catalog 1955, in sizes rang ing from 8 to 22. Machine 281-21 Use SINGER* Needle Catalog 1361, in sizes rang ing from 8 to 22. Size of needle to be used should be determined by weight of thread and type of material being sewn. Orders for needles should specify quantity required, size number and catalog number. For example: 100 No. 16, Catalog 1361 Needles SETTING THE NEEDLE Turn machine pulley over toward operator until needle bar reaches highest point as shown in Fig. 8. Loosen needle clamping screw. Insert needle into needle bar as far as it will go, with long groove of needle to the left and eye of needle directly in line with arm of machine. Then tighten the clamping screw. From the library of: Superior Sewing Machine & Supply LLC

Either right or left twist thread may be used in bobbin. Thread twist is determined by holding thread as shown in Fig. 9 and twirling thread over toward you. If left twist, strands will wind tighter. If right twist, strands will unwind or separate. Rough or uneven thread, or thread which passes through needle eye with difficulty, will interfere with successful operation of the machine. UPPER THREADING Turn machine pulley over toward operator until needle bor is at highest point. Pass thread through threading points indicated in Fig. 10. Draw approximately two inches of thread through needle eye with which to start sewing. 1. MOVE TO HIGHEST POINT LONG GROOVE 2. LOOSEN CLAMPING SCREW INSERT NEEDLE UP AS FAR AS POSSIBLE Fig. 8. Setting the Needle HOLD THIS END TWIRL OVER TOWARD YOU Fig. 9. Determining Thread Twist Fig. 10. Upper Threading From the library of: Superior Sewing Machine & Supply LLC

2. HOLD LATCH AND PULL CASE FROM HOOK LOWER THREADING Bobbin Removal Turn machine pulley over toward operator until needle bar is at highest point. Reach beneath bed of machine with left hand and remove bobbin cose from machine as shown in Fig. 11. Release latch and bobbin will drop out of case, as shown in Fig. 12. Threading Bobbin Case Fig. 11. Removing Bobbin Cose Hold bobbin so that thread will unwind in the direc tion shown in Fig. 13. Hold bobbin case as shown and place bobbin into it. Pull thread into slot and under tension spring, shown in Fig. 14, so that thread enters delivery eye at end of spring. Bobbin Case Replacement Place bobbin case on center stud of bobbin case holder and release latch. Place bobbin case back until latch catches near end of stud as shown in Fig. 15. Draw about two inches of thread from bobbin to start the sewing. 3. RELEASE LATCH 4. BOBBIN DROPS OUT Fig. 12. Removing Bobbin SLOT NEAR TOP c Fig. 13. Replacing Wound Bobbin 1. HOLDING LATCH, REPLACE BOBBIN CASE ON STUD 1. PULL THREAD INTO SLOT 2. DRAW THREAD DOWN AND UNDER SPRING DELIVERY EYE 3. TURN BOBBIN CASE OVER. DRAW THREAD UP AND INTO DELIVERY EYE Fig. 14. Threading Bobbin Case 2. RELEASE LATCH. Fig. 15. Replacing Bobbin Case 3. PRESS BACK, UNTIL LATCH CATCHES GROOVE IN STUD. From the library of: Superior Sewing Machine & Supply LLC

Tension on thread should be as light as possible while still sufficient to set stitches correctly in mate rial. Regulate needle thread tension, as instructed in Fig. 16. Make certain presser foot is DOWN during tension adjustment. Tighten lock nut to maintain tension adjustment. Regulate bobbin thread tension as instructed in Fig. 17. ADJUSTING THE PRESSURE Correct presser foot pressure helps insure proper feeding of material. Pressure should be as light as possible while still sufficient to insure correct feeding of material. Regulate as instructed in Fig. 18 with presser foot down. Pressure regulating thumb screw is fitted with lock nut. Tighten lock nut to maintain pressure adjustment. REGULATING THE STITCH LENGTH Changes in stitch length should never be attempted while the machine is running. See page 3 for information on maximum stitch length for your machine. Regulate the stitch length, as instructed in Fig. 19. Button mentioned in Step 4, Fig. 19, drops into notch with an audible click. MORE TENSION 2. TURN THUMB NUT 1, LOOSEN LOCK NUT LESS TENSION Fig. 16. Needle Thread Tension TURN REGULATING SCREW MORE PRESSURE 1. LOOSEN LOCK NUT 9 MORE TENSION ^ LESS TENSION Fig. 17. Bobbin Thread Tension -2. TURN THUMB SCREW LESS PRESSURE Fig. 18. Presser Foot Pressure 1. STOP MACHINE 3. TURN MACHINE PULLEY 2. DEPRESS BUTTON TOWARD YOU SLOWLY T 4. UNTIL BUTTON 5. THEN TURN MACHINE PULLEY TO DESIRED STITCH LENGTH AND DROPS INTO NOTCH RELEASE BUTTON Fig. 19. Regulating the Stitch Length From the library of: Superior Sewing Machine & Supply LLC

10 BUSHING SET SCREW THROAT PLATE SEAT BOTTOM OF LOWER NEEDLE BAR BUSHING 2.312" (281-1, 281-21) 2.599" (281-3) Fig. 21. Correct Setting: Needle Bar. Bushing CLAMPING SCREW THROAT PLATE SEAT (2) " © UPPER TIMING MARK NEEDLE STOP 1.031" (281-1, 281-3) 0.866" (281-21) Fig. 22. Correct Height: Needle Bar PREVENTING UNAUTHORIZED CHANGES IN STITCH LENGTH Stitch regulator button may be removed by loosening the tour screws and removing arm top cover, shown in Fig. 20. Remove retaining ring near tip of button allowing button to be withdrawn. Hole in top cover should then be filled by inserting plug screw 140607 which may be obtained at additional charge. Replace arm top cover. Inspect and adjust the machine, when it is required, in the order given. SETTING THE LOWER NEEDLE BAR | BUSHING I Gauge distance from throat plate seat to bottom of lower needle bar bushing, as shown in Fig. 21, is - - - 2.312 inches for Machines 281-1 and 281-21. 2.599 inches for Machine 281-3. Raise or lower needle bar bushing, as required to obtain correct height setting, after loosening bushing set screw shown in Fig. 21. SETTING THE NEEDLE BAR HEIGHT f Remove face plate, slide plate and throat plate. When needle bar is at its lowest point (during rota tion of machine pulley), the gauge distance from throat plate seat to needle stop in needle bar, as shown in Fig. 22, is - - - 1.031 inches for Machines 281-1 and 281-3. 0.866 inch for Machine 281-21. When needle bar is set at correct height, UPPER TIMING MARK on needle bar will be level with bot-- tom of lower needle bar bushing. To set needle bar height, remove face plate, slide plate and throat plate from machine. Loosen needle bar clamping screw shown in Fig. 22. Raise or lower needle bar as may be required. Securely tighten clamp ing screw. Replace all other parts previously removed. From the library of: Superior Sewing Machine & Supply LLC

Timing the machine consists of first adjusting the radial position of sewing hook with relation to move ment of needle bar and needle thread take-up lever, to make certain that loop of thread formed by needle will be correctly taken by point of hook at proper time. The check spring and feed are then timed to syn chronize their motions with needle and hook movement. TIMING THE SEWING HOOK Remove slide plate, throat plate, presser foot and feed dog. Turn machine pulley over toward operator until needle bar reaches its lowest point and rises to posi tion where LOWER TIMING MARK on needle bar is level with bottom of lower needle bar bushing, as shown in Fig. 23. At this position, point of sewing hook should be at center of needle, as shown in inset, in Fig. 23. Loosen two hook body screws shown and turn hook on shaft as required to bring point of hook to center of needle. See Fig. 24. Make certain that hub of hook is against oil re taining collar and tighten hook body screws. Check clearance between needle and hook point, in accordance with the following instructions. SETTING THE CLEARANCE BETWEEN NEEDLE AND HOOK POINT Check to see that needle is properly seated in needle bar and time sewing hook as previously in structed. Point of sewing hook should pass needle as closely as possible without striking or deflecting needle. A clearance of about the thickness of a piece of note paper (approximately .005 inch), as shown in Fig. 25, is sufficient. EYE HOOK POINT CLEARANCE ABOVE EYE HOOK POINT AT CENTER OF NEEDLE LOWER TIMING MARK LEVEL WITH BOTTOM OF LOWER ^ NEEDLE BAR BUSHING Fig. 23. Hook Point at Center of Needle HOOK BODY SCREWS Fig. 24. Hook Body Screws OIL RETAINING COLLAR NOTE-PAPER FLAT OF HOOK POINT Fig. 25. Clearance Between Needle and Hook 11 From the library of: Superior Sewing Machine & Supply LLC

NEEDLE AND HOOK POINT (Continued) To move hook point toward or away from needle, first remove slide plate, throat plate and bobbin case. Then, loosen the two bevel gear screws shown in Fig. 26 and loosen bushing set screw shown in Fig. 27. MAKE CERTAIN THAT BEVEL GEARS ARE KEPT IN MESH CONSTANTLY UNTIL THEIR SCREWS ARE SECURELY RETIGHTENED. HOOK SHAFT BEVEL GEAR BEVEL GEAR SCREWS ALWAYS KEEP ^ ^ GEARS IN MESH Fig. 26. Bevel Geor Screws LOOSEN BUSHING SET SCREW 1/4" BRASS DRIFT PIN TAP VERY LIGHTLY TOWARD NEEDLE. DO NOT DAMAGE 12 Fig. 27. Position of Drift Pin when Moving Hook Toward Needle BOBBIN CASE HOLDER POSITION FINGER 1 .018" TO .022" CLEARANCE POSITION FINGER SCREW Fig. 29. Position Finger Using a light mallet and a 1/4 inch brass drift pin, move hook assembly toward or away from needle as required. Figs. 27 and 28 show correct placement of drift pin. TAP VERY LIGHTLY to avoid damaging hook assembly. Securely tighten bushing set screw. Remove all end play from hook shaft by moving hook assembly firmly against front hook shaft bushing and, at the some time, moving hook shaft'bevel gear toward sewing hook end of shaft. Tighten screw 1, Fig. 26, on bevel gear. Securely tighten bevel gear screw 2, Fig. 26. Replace all parts previously removed. Check thread clearance between position finger and bobbin case, as instructed next. TAP VERY LIGHTLY AWAY QZ FROM NEEDLE 1/4" BRASS DRIFT PIN LOOSEN BUSHING SET SCREW DO NOT HIT BRIDGE Fig. 28. Position of Drift Pin when Moving Hook Away from Needle SETTING THE POSITION FINGER Clearance between position finger and bobbin case holder should be just sufficient to allow thread to pass through easily. Normally an .018 to .022 inch clear ance, as shown in Fig. 29, is required. If necessary, bend position finger CAREFULLY to achieve this setting. Top surface of the position finger must be kept level with the top surface of the bobbin case holder. From the library of: Superior Sewing Machine & Supply LLC

HOOK POINT -NEEDLE GUARD Correct Relationship LARGE NEEDLE BOBBIN CASE HOLDER Incorrect: Stringing Required HOOK POINT NEEDLE GUARD BOBBIN Fig. 30. Needle Guard at Loop-Taking Time POSITION FINGER SLOT POSITION FINGER FEED BAR HOOK POINT NEEDLE GUARD Incorrect Too Much Metal Removed from Guard 3 SMALL SCREWS The needle guard on the bobbin cose holder, shown in Figs. 30 and 33, should prevent needle from con tacting hook or bobbin cose at any time. See Fig. 30 (A) for correct relationship. When large needles (size 20 or larger) are used, needle guard may deflect needle too for toward left resulting in damage to needle. See Fig. 30 (B). To avoid this, it may be necessary to string the needle guard in accordance with the follow ing instructions. Remove needle, slide plate, throat plate and bobbin cose from machine. Turn machine pulley until feed bar, Fig. 31, is at its highest point. Remove position finger shown in Figs. 29 and 31. Turn hook body to position shown in Fig. 31 and remove three small screws and hook section shown. Turn bobbin cose holder until position finger slot on thread guard is at location shown in Fig. 32. Slip bobbin case holder out of hook body. Remove a slight amount of metal from needle guard by rubbing needle guard along a 1/8 inch strip of very fine emery cloth, as shown in Fig. 33. EXTREME CARE should be taken to avoid removal of too much metal as this may permit needle to strike hook. See Fig. 30 (C). Bobbin case holder will then need replacement. Clean bobbin case holder thoroughly before re placing it in hook body. Replace all ports in reverse order instructed for removal. HOOK POINT 1^ ' HOOK SECTION Fig. 31. Hook Section HOOK BODY POSITION FINGER SLOT ON THREAD GUARD BOBBIN CASE HOLDER Fig. 32. Bobbin Cose Holder GUARD l/8"#320 EMERY Fig. 33. Stringing Needle Guard 13 From the library of: Superior Sewing Machine & Supply LLC

Thread the machine. Turn machine pulley over slowly toward operator, observing check spring shown in Fig. 34. When take-up lever begins to rise, check spring should make a slight dip and return to its higher posi tion. As take-up lever approaches top of its stroke, set ting the stitch, check spring should be drawn all the way down. CHECK SPRING HIGHER Dtp STUD i; LOWER Fig. 34. Check Spring STUD SET SCREW 1/32" FOR "WASH AND WEAR" 1 MATERIAL FEED DOG TEETH PARALLEL TO THROAT PLATE if THROAT 3/64" FOR ALL OTHER MATERIALS PLATE Fig. 35. Correct Height of Feed Dog HINGE PIN ECCENTRIC HINGE PIN ECCENTRIC 14 FLAT SET FOR 3/64" RISE SET FOR 1/32" RISE Pig. 36. Feed Bar Hinge Pin (Eccentric) As take-up lever descends, check spring should return to rest. To increase or decrease height of check spring (which respectively increases or decreases its move ment), loosen stud set screw shown in Fig. 34. Turn stud along with entire check spring assembly to set check spring height as required. Securely tighten set screw. NOTE: Height setting should be checked each time a different presser foot is used with machine. SETTING THE CHECK SPRING TENSION Tension on check spring should be sufficient to insure action at top speed but light enough to allow check spring to be drawn all the way down. To adjust, first make certain that stud set screw shown in Fig. 34 is securely tightened. Then, using a screwdriver in slot of stud, turn stud alone toward left to decrease tension or toward right to increase tension. SETTING THE FEED DOG HEIGHT Feed dog height should be adjusted with machine set for longest stitch. ALL the teeth of the feed dog should rise equally high above the throat plate, as shown in Fig. 35. The correct height of feed dog for wash and wear fabrics is 1/32 inch above throat plate. For all other fabrics the correct height is 3/64 inch above throat plate. To set feed dog at correct height, loosen the two hex-head screws shown in Fig. 37. To obtain a height of 3/64 inch above throat plate, turn hinge pin eccentric, Fig. 36, until flat on slotted end is at top as shown. To obtain a height of 1/32 inch above throat plate, turn hinge pin eccentric until flat is at bottom. To raise or lower the REAR END of feed dog, turn hinge pin eccentric out of set position, as required. From the library of: Superior Sewing Machine & Supply LLC

If desired height cannot be obtained as previously stated, loosen clamp screw on crank shown in Fig. 37. Raise or lower feed bar as required to obtain desired height. Securely tighten clamp screw. Level the feed dog by means of hinge pin eccentric as previously instructed. Securely tighten the two hex~ head screws shown in Fig.. 37. NOTE: Variations in feed dog height may sometimes be necessary to balance height in relation to presser foot pressure. AVAILABLE FEED ECCENTRIC STOP SCREWS Machine is prevented from making longer stitches than a predetermined maximum by a stop screw shown in Fig. 38, in the feed eccentric. The following stop screws are available for these machines: 140256, 7 stitches per inch 140257, 5)4 stitches per inch 140258, 14 stitches per inch 140568, 8 stitches per inch CENTRALIZING THE FEED DOG Feed dog should never contact edges of throat plate but should move midway between sides of throat plate slots and maintain its movement equidistant from'front and rear edges of throat plate slots. Sidewi se Setting To move feed dog toward left or right, loosen the two clamp screws on feed bar carrier and the clamp screw on feed bar crank, shown in Fig. 39. Move feed bar as required to position feed dog mid way between sides of throat plate slots.. Make certain that feed dog height is correct as in structed previously. Securely tighten all three clamp screws. CRANK FEED BAR HINGE PIN ECCENTRIC CLAMP SCREW HEX-HEAD SCREWS Fig. 37. Feed Bar and Crank FEED ECCENTRIC STOP SCREW Fig. 38. Feed Eccentric Stop Screw CLAMP SCREW FEED BAR CRANK FEED BAR^ U) TWO CLAMP SCREWS FEED BAR CARRIER Fig. 39. Centralizing the Feed Dog 15 From the library of: Superior Sewing Machine & Supply LLC

Lengthwi se Setting Set machine for longest stitch and loosen hex-head screw, shown in Fig. 40, on rock shaft. Move feed bar carrier and rock shaft so that move ment of feed dog is equidistant from front and rear edges of throat plate slots. Securely tighten hex-head screw. Check linkage for freedom of movement to reduce wear and insure maximum efficiency. © FEED BAR CARRIER ROCK SHAFT Fig. 40. Feed Bar Linkage HEX-HEAD SCREW SETTING THE PRESSER BAR HEIGHT When presser foot rests firmly on throat plate, with feed dog below throat plate, there should be a slight clearance between guide and lifting bracket, shown in Fig. 41. When presser foot is raised to highest point end needle bar is at bottom of its stroke, top of presser foot should not contact needle bar. To adjust for clearance between guide bracket and lifting bracket, remove large plug from face plate and loosen clomp screw thus made accessible. This clamp screw is shown in Fig. 41. Face plate is removed in this illustration only to show entire presser bar assembly. Raise or lower guide bracket as required. Make certain that presser bar is correctly turned, with needle centered in needle slot (or between the toes) of presser foot then securely tighten clamp screw. 16 CAUTION: Whenever guide brocket has been moved on presser bar, inspect the check spring for correct setting as previously instructed. CLAMP SCREW CLEARANCE LIFTING BRACKET 0^0 GUIDE BRACKET Fig. 41. Presser Bar Assembly From the library of: Superior Sewing Machine & Supply LLC