74 0 Instruction manual I
Notes on safety A) Due to the up and down movement of the needle, the user must take sufficient care to avoid injury and observe the sewing area continuously while sewing. B) When leaving the machine, changing parts or accessories, the machine must be disconnected from the power source. C) The maximum approved wattage of the light bulb is 15 watts. D) The drive belt must never be adjusted by anyone but an authorized Pfaff agent.
Contents The controls of the sewing machine Accessory box Electrical connection Foot control Preparing for threading Threading, 4-thread double-overedge seam Threading right looper Threading left looper Threading the needles Inserting the lint box Sewing test Points to observe during sewing Securing the seam Checking and adjusting thread tension 3-thread overedge seam Thread chart Adjusting the stitch length on 794 Adjusting the stitch length on 796 Adjusting the differential feed on 796 Regulating the sewi
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_______________________________________ Controls of the sewing machine 1 2 3 4 5 6 7 11 12 13 14 15 16 17 18 19 20 21 22 23 Foot pressure regulating dial Thread guide Carrying handle Left needle thread tension dial Right needle thread tension dial Right looper thread tension dial Left looper thread tension dial cover 28 2 /// Presser foot lifter lever Hand wheel and feed regulator Looper cover Looper cover lever Work support Stitch length setting key on 794 Differential feed setting on 796 Needle pla
Accessory box Swing the work support to the left and pull out the accessory box. To replace the accessory box, slide it into the grooves and push it until it locks. The accessories are illustrated on page 32. Electrical connection Use this machine only on a flat surface or on a special sewing table. Attaching the toot control: Insert the plug of the control into the machine plug socket. Then connect the mains plug to a power source.
Switching the machine ON and OFF Power and sewing light are switched on and off simultaneously with the master Switch S Witching on: Press switch. Machine and sewing light are switched on. Switching off: Press switch again. Machine and sewing light are switched off. Foot Control The speed of the HObbyIo is regula as follows: When press,g the foot Control gently the machine will run at low Speed. when Pressing harder it will run faster.
Preparing for threading Adjustment of thread reel stand: Loosen the adjusting knob on the thread reel stand, slide it to the left and tighten it. Adjustment of the thread guides: Pull up the thread guide bar and align it so that the thread guides are directly above the reel stand. j JL_L_LjjJ L N \ zr’ Carrying handle and thread guide bar behind it: Insert fingers into the groove of the carrying handle and pull it up.
Opening and closing looper cover and work support Push looper cover lever to the right, swing cover in the direction of the arrow and lower it. To close the looper cover, push the cover until it locks. To open the work support, push it to the left. To close the work support, push it to the right until it locks. A threading diagram is affixed to the machine (A). Threading procedure Threading must be done correctly to obtain a well-formed seam. Thread the machine in the following sequence: 1.
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Threading the left looper: Insert the left looper thread in sequence 1 to 10 and pull approximately 10 cm (4) of thread through the looper eye (the thread path is marked orange).
Threading the right needle: Thread the right needle in sequence 1 to 7 and pull approximately 5 cm of thread through the eye of the needle. (The thread path is marked green.) Make sure to thread point 4 with special care; insert the thread behind hook A of the thread guide plates fitted on both sides. Threading the left needle: Thread the left needle in sequence 1 to 7 and pull approximately 5 cm of thread through the eye of the needle. (The thread path is marked blue.
Now close the work support (1), push the handle down (2) and close the looper cover (3). Inserting the lint box: Insert the tabs of the lint box into the slots (4) of the front cover. Push the lint box up against the front cover until it snaps in place. Use the reverse order to remove lint box.
Sewing a test sample After threading, a test sample should be sewn. Raise presser foot lever, as shown in illustration. Insert test fabric and lower presser foot. Hold thread ends with your left hand while turning hand wheel counter clockwise with your right hand. In doing so, the threads must be guided to the rear, under the presser foot. Make sure that threads have interlocked correctly.
Points to observe during sewing Place the fabric completely under the presser foot when starting to sew. (Also after the machine has been re threaded). Sew the first stitches slowly. Since the fabric is fed automatically, do not pull or push the fabric. Use your hand for guiding only. Finishing seam Sew approximately 5 cm beyond the end of the seam and use the thread cutter (1) behind the presser foot to cut the thread chain.
Securing the seam: Knot the thread chain. For knit fabrics, a crochet needle can be used to pull the thread chain into the seam. To prevent ravelling of seams, sew approximately 3 cm (1”) beyond the seam. Raise presser foot. Flip fabric over. Lower presser foot and sew over the seam approximately 2 cm (1/2’) without cutting the chain. Sewing very heavy fabrics and different thicknesses of fabric: This machine will sew through very thin to very heavy fabrics.
Setting thread tensions: The thread tension should be adjusted according to fabric type and thread size. Examine the seam and make the necessary tension adjustments. Top side Right looper thread Left looper thread - - I Reverse side Right needle thread Left needle thread Adjusting thread tension: Set all thread tension dials to “N” (standard setting). See illustration below. Sew a test sample to be sure that the correct tension has been obtained. See illustration above.
When the thread tension is turned in (+) direction, the tension is increased. When turned in (—) direction it is decreased. Incorrect thread tension; The left needle thread is too loose (blue thread tension). The right needle thread is too loose (green thread tension). The right looper thread is too tight (red thread tension) or the left looper thread too loose (orange thread tension).
_____ How to convert from four-thread to threethread sewing: Three-thread sewing is possible by using either right or left needles (see page 10). Remove the needle that is riot used (see page 26). 3-thread overedge seam 3-thread overedge seam Needle thread Left needle Rht needle Thread tension Marked blue Marked green Thread in needle clamp guides 0 0 Standard seam width maxim urn seam width 6.5 mm 4.
Thread chart Material Light materials: Organdy, light-knit fabric, Taffeta, silk, lining materials. Thread Stitch length Cotton No. 80—100 Silk Synthetic thread No. 80—100 No. 70—140 Medium-heavy materials: Cotton, tricot, linen, dress materials Cotton Silk Synthetic thread No. 60—100 No. 50—100 No. 70—140 2.0 to 4,0 mm Heavy materials: Tweed, suit materials, denim, heavy cloth Cotton Silk Synthetic thread No. 40-60 No. 40—60 No. 70—140 2.0 to 4.
Setting the stitch length on 796 Open lateral swivel table 15. Press stop of main feed dog (see arrow) fully downwards and hold it there. Turn handwheel 12 in the direction indicated by the arrow until it snaps into place. / di I! Ii II if If II I I I Set the required stitch length at mark A by continuing to turn handwheel 12 forwards or backwards, as may be required (point of arrow). The numbers indicate the stitch length in mm which normally is N = 3 mm.
U /cF WLfl Adjusting the differential feed The differential feed prevents interpIy shift. It consists of two teed dogs, arranged one behind the other, which both pick up and move the workpiece at the same time. The feed amount of either feed dog can be set separately. It is possible to have the workpiece moved more by the front teed dog than by the rear one and vice versa. Owing to that very good sewing results are accomplished.
In order to make sure about the setting ms table indicates possible settings of the differential feed. to be made. has test sewing a s proces to wish quired for the fabric you . sewing during set be r1e differential feed can also Setting of differential feed Illustration Correct seam 0.5 1 a Nylon, tricot, lining fabrics, popelin — 2 c Light cotton. Jeans (normal fabrics) 1.5 3 d Jersey, silk, medium cotton.
Adjusting seam width: Standard setting is 3.5 mm. The seam width can be changed from 2.5 to 6.5 mm. according to fabric type and seam requirements. Note: Before adjusting the stitch width, always disengage the upper knife. To disengage upper knife, open looper cover. Push upper knife holder (1) to the far right. Turn knurled knob (2) clockwise until it clicks. Choose the required seam width by turning the stitch width button (3). Normal stitch width is “N”.
Changing the sewing feet Push lever A up slightly (Fig. 1), and the presser foot will snap out. Place the foot under the presser foot holder so that crosspiece B of the rolled hem foot engages in groove C of the holder (Fig. 2). Push the presser foot lever down and with the other hand gently push lever A up until the foot snaps on.
Rolled hem to determine if the fabric is suitable Use a rolled hem on fine and delicate fabrics. A quick test index finger. If it rolls, the Pfaff and thumb n betwee fabric roll the for a rolled hem is to hem. rolled Hobbylock will quickly produce a professional 1. Remove left needle. R”, from accessory box. 2. Snap on rolled hem foot, marked with the letter only. 3. Use green, red, and orange threading paths r rayon thread for a rolled hem with 4.
Changing needles Removing needle: Unplug the machine. Turn the hand wheel counter-clockwise to raise the needle bar to its highest position. Loosen the needle clamp screw with the allen wrench and pull the needle Out. Inserting needle: When the needle bar is at the highest position, insert a new needle in the needle holder, making sure the groove of the needle faces you and scarf A (centre of illustration) can be seen from the side. Push the needle up as far as it will go and tighten the needle clamp screw.
__ ___ _________ Loosen knife clamp screw (1) and pull the lower knife down. - I t:z Inserting lower knife: Insert a new knife into the groove of the lower knife holder with the cutting edge facing right. Set the knife so that the cutting edge aligns with the surface of the needle Tighten the lower knife clamp screw. Push upper knife to the right and turn to the front until it snaps into place (operative position).
Changing upper knife: The upper knife is carbide tipped and will not need to be replaced with normal use. It has to be replaced only when the cutting edge has been damaged. Unplug the machine. Push the upper knife holder to the far right and turn the knob clockwise until it clicks. Unscrew the knife retaining screw and remove upper knife. To replace the upper knife, insert the retaining screw through cutout (1) of the knife. Screw it into threaded hole (2) of the knife holder.
Changing the light bulb: Unplug the machine. Remove the retaining screw from the light cover and swing cover to the left. Turn the bulb in direction (1) and remove it. Insert the new bulb with pins into slots (3). Push bulb up and turn it in direction (2). Replace cover. Caution: Use a 15 watt bulb only. Cleaning thread tensions: Flip the tension cover down. Use the brush provided with the accesories to remove dust and lint from the discs. Close the tension cover.
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ewing problems and solutions hs machine is easy to operate and there are no difficult adjustments to be made. Problems, similar the ones described below, occur because of simple adjustment errors. They can easily be corrected the solutions offered. Problem Cause Solution Material is not fed correctly Sewing foot pressure too weak Turn sewing foot pressure screw clockwise to increase pressure. Needle breakage Needle bent or point damaged. Needle not correctly inserted. Insert new needle.
Accessories 1 2 3 4 5 6 7 8 9 3 Screwdriver AlIen wrench Lint brush Tweezers Lower knife Thread unreeling disc Needles Oil Rolled hem presser foot Optional accessories (not illustrated): Blindhem foot Elastic foot 4 5 /__• 60 Specifications Highest sewing speed Overedge seam width Stitch length Sewing foot Lubrication Needle system Dimensions Weight . • • • . . stitches/mm, 30—6.5 mm 1—5mm Snap-on Manual DB x 1 or 1738 (size 9—14) 24x22x18.5cm 8.5 kg (19 lbs.
PFAFF-HANDELSGESELLSCHAFT für Haushaltnäh maschinen m b. H 7500 Karlsruhe 41 West Germany Sube to aftratons in design 0288 No. 30068 .
