747! instruction manual i; II.
Notes on safety A) Owing to the up and down movemen t of the needles and the upper knife, the user must take sufficient care to avoid injury and observe the sewi ng 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 adju sted by anyone but an authorized Pfaff agent.
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& Contents Controls of the sewing machine Electrical connection Master switch and sewing light Foot control Notes on safety Installing the thread spool stand Opening the looper cover Threading guide wires 18 and the thread guides behind the carrying handle 4-thread overedge seam Threading the right looper Threading the left looper Threading the left and right needle Thread reel change on threaded machine Inserting the lint box Seam allowance Sewing test Points to observe during sewing Securing the seam Axi
I Controls of the sewing machine 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Thread spool stand Carrying handle Left needle thread tension dial Right needle thread tension dial Right looper thread tension dial Left looper thread tension dial Thread tension cover Lint box Handwheel Looper cover with recess Upper knife Work support (swivel-type) Needle plate Sewing foot Needle bar Sewing foot lifting lever Thread spool holder Thread guides Thread g
Electrical connection Use this machine only on a flat surface or on a special sewing table. Connecting the foot control: Insert the plug of the control in the machine socket. Then connect the mains plug to a power source. Caution: When the machine is not in use, switch it off at the master switch and disconnect the plug from the power source. Do not place any objects on the foot control. Switching the machine ON and OFF Power and sewing light are switched on and off simultaneously with master switch 12.
Foot control The speed of the Hobbylock is regulated as follows: The more you press the foot control down, the faster the machine will sew. Electronic foot control Maximum speed can be pre-selected in two steps by the switch on the foot control. Position Position +4 = = Half speed Full speed Notes on safety A) Owing to the up and down movement of the needles and the upper knife, the user must take sufficient care to avoid injury and observe the sewing area continuously while sewing.
______I Installing the thread spool stand Loosen clamp screw A a little and pull washer up to the screw head. Insert thread spool stand 1 from the top. / A clamp screw A securely. Tighten 4 Insert four thread spool holders 17 with centering pieces 36 fully in the holes of the thread spool stand. / - Push thread guiding part 18 into guide bar 19. I 6 Pull up guide bar and align it so that thread guides 18 are exactly above the spool holders.
I n E1 Opening and closing looper cover and work support Push looper cover fully to the right. hold it, and swing it down. To close the looper cover, push it up until it locks. To open work support 12, push it to the left. To close the work support, push it to the right until it locks. A threacing diagram is fixed to the machine behind the looper cover. This diagram shows the different threading paths by different colors (see Fig. A).
4-thread overedge seam This seam is sewn with two needle threads and two looper threads. The 3-thread overedge seam is described on page 17. 1 2 - - 3 Threading the right looper: Thread the right looper in sequence 1 to 9 and pull approximately 10 cm (4”) of thread through the looper eye (the thread path is marked red). Important: In order to obtain perfect sewing results, the thread must be pulled between the tension discs when threading the tensions.
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Threading the right needle H— .1 Threading of guide wires 18 and of the thread guide behind the carrying handle is shown on page 7. 2 In the left-hand illustration the threading path is shown from the green tension (1> up to the right needle (6>. At point 5 the thread must be pulled behind the thread retainer. •f? 3 111.3 rrc —3 5 •L!J : :‘1i Ll rk Threading the left needle Threading of guide wires 18 and of the thread guide behind the carrying handle is shown on page 7.
I - After threading the machine, push handle 2 down, and close work support 12 and looper cover 10. I-J Inserting the lint box: / / I downwards the cover. Then push the bottom of the box against the machine.
Sewing test —- - . - . - After threading, a sewing test test should be made. Raise sewing foot lever 16, as shown in the illustration. ‘I / / . / Insert test fabric up to the upper knife and lower the sewing foot. I ‘N I \ 12 \ I I Hold thread ends with your left hand while turning hand wheel with your right hand in the direction indicated by the arrow on the wheel. Lay the threads back under the sewing foot. Make sure that threads have interlocked correctly.
Points to observe during sewing Place the fabric completely under the sewing foot when starting to sew. (Also after the machine has been rethreaded.) 4 Sew the first stitches slowly. Since the fabric is fed automatically, do not pull or push the fabric. Use your hand for guiding only.
Securing the seam: Blocking the upper knife Knot the thread chain. For knit fabrics, a crochet needle can be used to pull the thread chain into the seam. Sewing very thick fabrics and workpieces with different thicknesses: Or: Sew about 5 cm (2”) beyond the end of seam. Then turn the workpiece around and sew a few stitches over the seam just sewn without cutting the thread chain. On this machine, all kinds of fabric from extremely thin to extremely thick can be processed.
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Correcting the thread tensions When the thread tension is turned in (+) direction, the tension is increased. When turned in (—) direction it is decreased. The left needle thread A is too loose (blue thread tension). J The right needle thread B is too loose (green thread tension). Top side D C Reverse side The right looper thread C is too tight (red thread tension> or the left looper thread D too loose (yellow thread tension).
I The 3-thread overedge seam is sewn needle with two looper threads and one thread. ved. The left or right needle must be remo 3-thread overedge seam: fl 3-thread overedge seam Left needle Right needle !J Standard seam width N * 5,7 mm Max. seam width 7.2 mm Standard seam width N 3.5 mm Max.
Thread chart for 4-thread overedge seam Material Thread Stitch length Light materials: Organdy, light-knit fabric, Taffeta, silk, lining materials Cotton Silk Synthetic thread No. 80—100 No. 80—100 No. 70—140 2.0 to 4.0 mm Cotton Silk Synthetic thread No. 60—100 No. 50—100 No. 70—140 2.0 to 4.0 mm Cotton Silk Synthetic thread No. 40—60 No. 40—60 No. 70—140 2.0 to 5.0 mm (784) 2.0 to 4.0 mm (786) Cotton Silk Synthetic thread No. 40—60 No. 40—60 No. 70—140 2.0 to 5.0 mm (784) 2.0 to 4.
Adjusting the differential feed on the hobbylock 786 The differential feed prevents inter-ply shift. It consists of two feed 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 feed dog than by the rear one and vice versa. Owing to that very good sewing results are accomplished.
This table indicates possible settings of the differential feed. In order to make sure about the setting required for the fabric you wish to process, a sewing test has to be made. The differential feed can also be set during sewing. Setting of differential feed 0.5 to — — Illustration Correct seam 1 a N — Nylon, tricot, lining fabrics, satin, poplin, and silk Light cotton, jeans (normal fabrics) 2 N 3 1.5 1.
* Disengaging the upper knife Remove lint box 8. Open work support 12 and looper cover 10. If necessary, loosen screw 38 for axial upper knife blocking. 0 Push rotary lever 27 of the axial upper knife guide fully to the right, hold it, and turn it forwards until pin A engages in the hole of the knife. Now the upper knife is disengaged. cA — fl\ Adjusting the seam width c The standard seam width setting is marked with N (3.5 mm). Disengage the upper knife according to the above description.
r Changing the sewing foot Raise sewing foot lifting lever 16. the sewing foot by pressing ‘.—..., Engage the sewing foot. Place the sewing foot under the sewing the foot holder so that when you lower sewing foot lifting lever, crosspiece G of the foot engages in groove H of the sewing foot holder. H The illustration on the left shows a correctly engaged sewing foot.
I Changing the light bulb: Pull out the mains plug. Loosen the housing cover retaining screw. Open the housing cover. Behind it, the light bulb of the sewing light is situated. ‘\ H Removing the light bulb: Push the light bulb upwards and turn it fully to the left. Inserting the light bulb: Insert the new bulb (15 Watt max.) with the pins in the slots, push it up and turn it fully to the right. Close and fasten housing cover.
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I ad Rolled hem with polyester thre machine: Preparation of the sewing dle nee left ove rem Needle: ed hem foot “R” Sewing foot: engage roll material) 4.0 mm (depending on Seam width: from 3.0 to th) leng (short stitch tensions Stitch length: from 1.0 to 2.0 red and yellow thread thread 120—140 for green, ter yes pol : ead Thr Threading path: polyester thread 1. right looper, red path polyester thread polyester thread 2. left looper, yellow path path 3. needle thread, green to 11.
Changing the needles Pull out the mains plug. Lower the sewing foot. Turn the hand wheel in the direction of the arrow until the needle bar is at its highest position. Use the needle change tool from the accessories (see p. 31, tern 11) as follows: Insert the needle in hole M of the needle change tool. Loosen the set screw of the needle with the screw driver. Remove the needle by pulling it downwards.
I __ _ Changing the upper knife: Pull out the mains plug. Unscrew the knife retaining screw and remove upper knife. - - / 1 [ Insert the new upper knife and tighten its retaining screw securely. I— L_—-- . N’ / Set upper knife with knife guide 27 up (cutting position).
I /( :;;: -ZL--1 Changing the lower knife Pull out the mains plug’ Disengage the upper knife (see page 21). Remove the retaining screw of the lower knife. Place the new lower knife against the left guide of the lower knife holder and push it up, as shown in the illustration. Replace the screw with the pressure plate. p Align the cutting edge of the lower knife so that it is flush with the needle plate surface. Before tightening the retaining screw, align the pressure plate.
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Sewing problems and solutions These machines have been developed for easy operation, and there are no difficult adjustments to be made. Sewing problems of the kind described below may occur due to minor adjustment- and operation errors. They can easily be corrected by following the instructions below. Problem Cause Solution ______ Needle bent or point damaged. Insert new needle. Needle not fully inserted. Insert new needle correctly (see page 26). Material pulled.
I Accessories 1 Screwdriver (big) 2 Screwdriver (small) 3 Lint brush 4 Tweezers 5 Upper knife 6 Thread unreeling disc 7 Needles 8 Sewing machine oil 9 Rolled hem sewing foot 10 Thread spool net 11 Needle change tool 5o t I 6Q I •11 Thread spool net Very useful for synthetic threads which tend to become loose, unravel and slip down (Fig. 1). Thread unreeling disc The thread unreeling disc shown as item 6 of the accessories is used for smaller thread spools.
Specifications: Maximum sewing speed Seam width Stitch length Sewing foot Lubrication Sewing foot height Needle system Number of threads Dimensions Weight Contents of cardboard box 1 1 1 1 1 4 1 1 32 machine with motor foot control instruction manual/guarantee certificate lint box thread spool stand thread spool stand bars thread guide machine cover 1.300 stitches/mm. 3-7.2mm 1 —4 mm (HL-786) 1 -5 mm (HL-784) Hinged Manual 5mm 130/705 H (no. 75— no. 90) 4 315 x 280 x 330mm approx. 8.
