coverlock 4852 Owner´s manual
Parts of the coverlock 4852 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Upper needle-thread tension Upper needle-thread tension Carry handle Thread tension/upper looper thread Thread tension/lower looper thread Thread tension/two-thread chainstitch looper/cover stitch looper Looper cover Blade guard Looper disengaging lever Standard presser foot Needle plate Swivel plate Adjusting knob for seam width Seam width viewing window Needle holder Sewing light cover Adjusting knob for presser foot pressure 18 19 20
This household sewing machine is designed to comply with IEC/EN 60335-2-28 and UL1594 IMPORTANT SAFETY INSTRUCTIONS When using an electrical appliance, basic safety precautions should always be followed, including the following: Read all instructions before using this household sewing machine. DANGER - To reduce the risk of electric shock: • A sewing machine should never be left unattended when plugged in.
Simple, up-to-date sewing Congratulations! You have bought a high-quality product that provides unique advantages. Your new coverlock 4852 can take any material in its stride and will sew through thick and thin for you. Your PFAFF coverlock features the very latest in design and technology, and it is just as simple to operate as this instruction manual is to follow. Before you start sewing, please take the time to read these instructions carefully.
Contents Page Accessories ................................................................................................................ 6 Accessories, optional ................................................................................................ 62, 63 Accessory box ............................................................................................................. 6 Adjusting the machine to Prog. 01, 02 ......................................................................
Contents Page Sewing problems and their solutions ...................................................................... 61 Specifications ............................................................................................................. 64 Spool dise ................................................................................................................... 10 Spool holder ...............................................................................................................
Accessory box Open the accessory box 49 by gently pressing the bottom of the box inwards. The following accessories can be found in the box: 1 2 3 4 5 6 7 8 9 10 11 12 13 Thread nets (5) Overlock needle system EL X 705, cat. no.
Connecting the foot control Electrical connection Connect the plug of the foot control to the connection socket 39 of the machine. The sewing speed is regulated by activating the foot control. You may also regulate the sewing speed by adjusting the slide on the front side of the foot control. Setting 3 = half of final speed Setting 8 = full final speed Connect the foot control cord with the wall outlet.
Looper cover Push the looper cover 7 fully to the right and then swivel it down. Five types of stitches and their threading paths are portrayed in color on the inside of the looper cover. Note: The electricity supply of the machine is cut off as soon as the looper cover or swivel plate 12 is opened, for safety reasons, i.e. sewing with the machine is no longer possible. Waste container Insert the upper latch of the waste container 45 into the upper slot of the looper cover 7.
Spool holder Telescopic thread guide Before placing thread cones/spools on machine you must pull the spool holder 34 fully away from the back of machine. Pull the telescopic thread guide 32 upwards to its highest position. To ensure optimum thread feed, turn the telescopic parts slowly until you hear the locking balls flick into place. Thread net Thread unreeling disc Synthetic threads generally unwind too quickly from the thread spool.
Spool disc/cone thread adapter Clip on thread guide It is advantageous to use the spool dise 37 when sewing with large spools (5,000 10,000 m). To do this, place the cone thread adapter 36 onto the spool pin 35. With synthetic threads, the spool discs help eliminate vibration of the cones/spools aiding in smoother feeding of the threads. Use the clip on thread guide accessory when sewing with decorative thread.
Presserfoot With standard presser foot 10 use setting ”A” on the spring loaded presser foot latch for the cover stitch (Prog. 02), the 2 thread chainstitch (Prog. 01), the 5 thread safety stitch seam (Prog. 09) and the 4 thread safety stitch seam (Prog. 08). Transparent presser foot F from the accessories can also be used for the cover stitch (Prog. 02). For all other programs use standard presser foot 10 and setting ”B” on the springloaded presser foot latch.
Needle position This machine has 4 needle positions and can sew with a maximum of two needles at any one time. The needle positions are 1 1, L2, R11 and R2. The fastening screw is located directly above the corresponding needle. Note: If the needles 1 11 and L2 have been inserted, the left needle will be somewhat lower than the right needle. 14 The different needle positions are depicted in a schematic drawing in the instruction manual. Also refer to the examples above and below.
Changing the needle Switch off the electrical power To remove: Lower the presser foot and move the needle(s) to the highest position by turning the handwheel towards you. Push the needle inserting tool (from the accessory box 49) from below upward fully over the needle. Loosen the fastening screw of the needle (without removing it) with the Allen key (behind the swivel plate) and pull the needle down to remove.
Threading the thread guides Place the spools on the spool pins 35. You will find information on the thread net, thread unreeling disc, spool disc and cone thread adapter on pages 9 and 10. Thread through the thread guides 31 from the back to the front following the colored threading paths. Lift the carry handle 3 upwards. Thread through the underside of the carrying handle and through the rear thread guides 44 using both hands to pull the thread down until it slips under the thread guide.
Threading the upper overedge looper (pink) Turn the handwheel towards you until the upper overedge looper 18 is in its highest position. Thread in a sequence of 1 to 8. Note: To make this task easier, use the tweezers which can be found behind the swivel plate. Thread through the thread guides 1 to 7, which are marked with a pink dot. Thread from the front through the eye of the upper overedge looper 8.
Threading the lower overedge looper (yellow) Turn the handwheel towards you until the lower overedge looper 19 is on the extreme right. Thread in a sequence of 1 to 10. Note: To make this task easier, use the tweezers which can be found behind the swivel plate.
Thread through the thread guides 1 to 8, marked yellow. Press lever A downwards and hook the thread into guide B. Please also refer to the drawing below. Note: The lever returns automatically to its position as soon as you start sewing. Thread from the front through the eye of the lower overedge looper C (= threading point 10). Pull approximately 4” (10 cm) of thread through the looper and place it to the left under the presser foot.
Threading the two thread chainstitch looper and cover stitch looper (violet) for the chainstitch Turn the handwheel towards you until the two thread chainstitch looper 20 is on the extreme right. Thread in a sequence of 1 to 11. Note: To make this task easier, use the tweezers which can be found behind the swivel plate.
Thread the thread guides which are marked with a violet square in a sequence of 1 to 9. Push lever A upward and hook the thread into slot B. Also refer to the drawing below. Note: The lever returns automatically to its position as soon as you start sewing. Thread from the front through eye C of the two thread chainstitch looper and the cover stitch looper (= threading point 11). Pull approximately 4” (10 cm) of thread through the looper and place it to the left under the presser foot.
Exception: Threading the two-thread chainstitch looper and cover stitch looper for the cover stitch (violet) (Prog. 02) Turn the handwheel towards you until the two thread chainstitch looper 20 is on the extreme right. Thread in a sequence of 1 to 10. Note: To make this task easier, use the tweezers which can be found behind the swivel plate.
Thread the thread guides, as shown in the diagram, in a sequence of 1 to 8. Some of the threads guides are marked with a violet square. Press lever A upward and hook the thread into slot B. Also refer to the drawing below. Thread from the front through eye C of the two-thread chainstitch looper and the cover stitch looper (= threading point 10). Pull approximately 4” (10 cm) of thread through the looper and place it to the left under the presser foot.
Threading the needles Thread in a sequence of 1 to 8. Note: To make this task easier, use the tweezers which can be found behind the swivel plate. The thread must be guided through the lower slot of thread guide 4. Pull approximately 4” (10 cm) of thread through the looper and place it to the left under the presser foot. Note: For the cover stitch the thread must also be guided through the lower thread guide 7.
Exception: Threading needle L2 when sewing a 5thread safety-stitch seam (Prog. 09), a 4thread safety-stitch seam (Prog. 08) and a 2-thread chainstitch (Prog. 01) Thread in a sequence of 1 to 9. Note: To make this task easier, use the tweezers which can be found behind the swivel plate. The thread must be guided through the upper slot of thread guide 5. Pull approximately 4” (10 cm) of thread through the looper and place it to the left under the presser foot .
Important note on threading The needle(s) must always be threaded last so that the needle threads do not run under the looper thread as seen in drawing 1, but instead over the looper thread as depicted in drawing 2. Should this sequence not be followed, thread breakage or missed stitches can occur. If the looper threads break, you must pull the needle threads out of the needle eye, rethread the loopier thread and then rethread the needle threads.
Needle threader Move the needle(s) into the highest position and lower the presser foot. Place the thread from right to left in notch A of the needle threader (to be found in the accessory box). One of the two triangles must point upwards. Place the needle threader onto the front groove of the needle. Slide the needle threader down to the needle eye and press it lightly against the needle. A small metal pin is pushed through the needle eye and the needle is automatically threaded.
Overview of the threading paths and threading sequences Program 01: 2-thread chainstitch Program 02: cover stitch Program 03: 2-thread flatlock, narrow Program 04 2-thread flatlock, wide Program 11: 2-thread serging, narrow Program 12: 2-thread rolled hem Program 13: folded 2-thread rolled hem 28
Overview of the threading paths and threading sequences Program 05: 3-thread overedge.
Overview of the threading paths and threading sequences Program 09: 5-thread safety-stitch seam Program 10: 2-needle 3-thread assembly seam Presser foot pressure The pre-set presser foot pressure on the machine is suitable for medium heavy fabrics. The presser foot pressure does not need to be adjusted for most fabrics. If you are working with light or heavy fabrics then you may need to adjust the pressure.
Thread chain cutter After finishing the seam, sew an approx. 6” - 8,1” (15 20 cm) long thread chain. Pull the thread chain from the right to left over the thread chain cutter 33. This will cut off the thread chain. Clamp spring for serging thread chain 25 Using this feature you can secure the thread chain at the start of the fabric by pulling it into the seam. Stitch off a minimum 4” (10 cm) long thread chain and raise the presser foot.
Disengaging the upper blade Switch off the electrical power Move the movable upper blade 23 into its highest position by turning the handwheel towards you. Remove the waste container and open the looper cover and the swivel plate. Push the knob for lowering the upper blade 27 fully to the right. To lower the upper blade turn the knob towards you until the upper blades clicks into place below. The upper blade is now disengaged.
Swiveling stitch width latch For standard overlock seams: The swiveling stitch width latch 22 remains in the basic position when sewing all types of standard overlock seams (exception: Program 01, 02). For rolled hems: Pull knob (A) to the right and swivel the swiveling stitch width latch 22 downwards. This setting allows you to sew all types of rolled hems.
Attaching the converter Switch off the electrical power The converter 28 must be attached for all two thread seams (exception: Program 01) and the two needle three thread assembly seam. Open the swivel plate and remove the converter 28 from its storage place. Push the tip of the converter into the back side of the upper overedge looper until it clicks into place and push the converter onto the overedge looper bracket.
Setting the seam width The required seam width can be adjusted anywhere between 3.5 and 6 mm by turning the adjusting knob for seam width 13. The setting can be seen through the viewing window 14. The two thread chainstitch is sewn with a clearance of 6.5 to 9 mm. Illustration A: Should loops project out of the workpiece, move the movable upper blade 23 to the right by turning the seam width adjusting knob upwards.
Adjusting the machine to the cover stitch (Prog. 02) and two thread chainstitch (Prog. 01) This is only necessary if you do not want to trim the fabric edge. Insert the needle(s) (see page 13) according to the overview of the threading paths and threading sequences (see page 26). Open the looper cover and remove the blade guard 8 by pulling it towards you. Lower the swiveling stitch width latch (see page 31) and disengage the upper blade (see page 30).
Press the power table 50 downwards into the designated slot on the looper cover. Close looper cover. Note: Please ensure that the upper overedge looper is disengaged before attaching the power table 50. To return the machine to its previous settings after sewing with the cover stitch or two thread chainstitch: Open the looper cover and remove the power table. Move the looper disengaging lever to the right, thus re-engaging the upper overedge looper.
Differential feed The differential feed consists of two feed dogs (A + B), one behind the other, which feed the fabric. The movement of the front feed dog (A) and thus the amount of material to be fed can be regulated using the regulator wheel 41. The setting range is between 0.5 and 2.0. The standard setting is 1.0, where the movement of the front feed dog (A) is synchronized with the rear feed dog (B). This means that the front feed dog feeds the same amount of fabric as the rear feed dog.
Set the regulator wheel for the differential feed 41 to 2.0. Here the front feed dog feeds twice as fast as the rear feed dog. This means that the front feed dog feeds twice as much fabric as the rear feed dog, causing the material to gather. Here you will avoid stretching in the seam when working with knitwear, such as jerseys or gathered fabrics. Instead, a smooth seam (A) will be achieved. You can also achieve decorative effects with the differential feed dog.
Adjusting the stitch length You can set the desired stitch length between 0.5 mm to 4.0 mm by turning the stitch length adjustment knob (42). Note For the two thread chainstitch, the setting should be 3.0 or higher. Removing the needle plate Raise the presser foot and move the needle(s) to the highest position. Remove the presser foot and open the swivel plate. Press down the needle plate disengaging lever 26. The needle plate 11 is raised out of its mount. The needle plate can be removed to the left.
Securing the upper blade Switch off the electrical power It is recommended to secure the movable upper blade 23 before sewing heavy fabrics. Raise the needle(s) to its highest position and open the swivel plate. Tighten the screw fully using the Allen key. This screw should always be slightly loosened again after sewing heavy fabrics. Note: The seam width can no longer be adjusted once the upper blade is secured.
Program Application Program 01 2 thread chainstitch Joining fabric layers where a traditional pressed open seam is required. Also works well as a basting stitch for test fitting garments. Program 02 Cover stitch Sewing hems and fancy stitches. Program 03 2-thread flatlock, narrow Serging light fabrics. Joining stretch fabrics with a flatiock seam. Program 04 2-thread flatlock, wide Serging medium heavy fabrics. Joining stretch fabrics with a flatlock seam.
Converter 28 Thread tension ■ = with ® = without Thevaluerefertomedium-heavyfabricsandnormalpolyesterthread level 9 ● = with ° = without ® ▼ ● ® ▼ ■ Stitch width latch 22 ■ = top ® = bottom Looper disengaging Power table 50 blue green pink yellow violet ® 5.0 2.0 ● ® 6.0 ▲ ° ■ ■ ▲ ° ■ ■ ▲ ° ® ■ ▲ ° ® 5.0 ■ ▲ ° ® 5.0 4.0 ■ ▲ ° ■ 5.0 1.5 ■ ▲ ° ® 5.0 5.0 6.0 1.0 1.5 5.0 1.5 5.5 4.0 3.0 2.0 2.0 2.0 2.0 2.0 2.0 5.5 2.0 2.0 2.
Program Application Program 10 Joining and simultaneous serging of light, very stretchy fabrics. 2-needle, 3-thread assambly seam Program 11 2-thread serging, narrow Serging light fabrics. Program 12 2-thread rolled hem Serging very light fabrics. Decorative edges. Program 13 Folded 2-thread rolled hem Serging very light fabrics. Decorative edges. Program 14 3-thread rolled hem Serging light to medium-heavy fabrics. Decorative edges.
Converter 28 Thread tension ■ = with ® = without Thevaluerefertomedium-heavyfabricsandnormalpolyesterthread level 9 ● = with ° = without ■ ▲ ° ■ ■ ▲ ° ■ ® ▲ ° ■ ® ▲ ° ■ ® ▲ ° ® 5.0 4.0 3.0 ® ▲ ° ® 5.0 2.5 7.5 ■ ▲ ° ® 1.5 2.0 6.0 ■ ▲ ° ® 7.0 0.5 8.0 ■ ▲ ° ® 1.0 2.0 7.0 Stitch width latch 22 ■ = top ® = bottom Looper disengaging Power table 50 blue 5.0 green pink yellow violet 4.0 1.0 4.0 1.0 1.5 6.0 4.0 4.
Important notes on sewing with the cover stitch The power table is marked with various units of measurement. The upper figures are in cm. The lower figures are in inches. Note: The hemmer guide H2 is available as an optional accessory. With this optional accessory you can hem your fabric effortlessly without having to press under the hem edge prior to sewing the cover stitch. Preparing the fabric: When not using the H2 optional accessory guide, it is useful to press under the fabric edge before hemming it.
2. If sewing on a tubular item, i.e. pant or sleeve hem: Sew around tubular item, oversewing 4-5 stitches at the beginning of your seam ’ After the last stitch, turn the hand wheel towards you until the needles pierce the fabric and you have heard each needle ”click” (just before the needles are in the lowest position). Edge guide Push the edge guide (included in your accessory box) into the guide holder A from the left. The edge guide can be set as required by sliding it to the left or right.
Stitch formation correction measures cover stitch Program 02 When all tensions are correctly set, the needle threads (green and blue) are just slightly visible on the underside of the fabric. The looper thread (violet) is situated loosely in between. The right needle thread (green) is too loose, causing large loops on the underside of the fabric. Set the green thread tension to a higher value. The needle threads (green and blue) are set too tightly causing folds in the fabric.
5-thread safety-stitch seam 4-thread safety-stitch seam Program 09 Program 08 Since the 5-thread safety stitch seam consists of the 2-thread chainstitch and the 3thread overedge seam, you can refer to the correction possibilities of these seam below and on page 49. Since the 4-thread safety stitch seam consists of the 2-thread chainstitch and the 2-thread flatlock, you can refer to the correction possibilities of these seam below and on page 51.
4-thread overedge seam Program 07 When all tensions are correctly set, the loops of both looper threads (pink and yellow) are directly on the edge of the fabric. The needle threads (blue and green) are too loose, causing larger loops of needle thread on the underside of the fabric. Set the blue and green thread tension to a higher value. The upper looper thread (pink) appears on the underside of the fabric. The lower looper thread (yellow) appears on the top side of the fabric.
3-thread overedge seam narrow and wide Program 05 and 06 When all tensions are correctly set, the loops of both looper threads (pink and yellow) are directly on the edge of the fabric. The needle thread is too loose, causing loops on the underside of the fabric. Set the relevant needle thread tension to a higher value. The upper looper thread (pink) appears on the underside of the fabric. The lower looper thread (yellow) appears on the top side of the fabric.
3-thread flatlock narrow and wide Program 16 and 18 The needle thread is too tight. Set the needle thread tension (blue) to a lower value. The upper looper thread (pink) appears on the underside of the fabric. The lower looper thread (yellow) is too loose. Set the pink thread tension to a higher value. Set the yellow thread tension to a higher value.
2-thread flatlock narrow and wide Program 03 and 04 When all tensions are correctly set, the loops of both threads are directly on the underside of the fabric. Note: The converter (see page 32) must be attached to sew the 2-thread flatlock seam. The needle thread is too loose or the lower looper thread (yellow) is too tight. Set the relevant needle thread tension to a higher value and/or the yellow thread tension to a lower value.
3-thread rolled hem The upper needle thread (green) is too loose. Program 14 Set the green thread tension to a higher value The upper looper thread (pink) appears on the underside of the fabric. The lower looper thread (yellow) appears on the top side of the fabric. Set the pink thread tension to a higher value and/or the yellow thread tension to a lower value. Set the yellow thread tension to a higher value and/or the pink thread tension to a lower value.
3-thread rolled hem (folded) The upper needle thread (green) is too loose. Program 15 Set the green thread tension to a higher value. The upper looper thread (pink) only partly loops around the fabric edge. The lower looper thread (yellow) appears on the top side of the fabric. Set the pink thread tension to a lower value and/or the yellow thread tension to a higher value. Set the yellow thread tension to a higher value and/or the pink one to a lower value.
2-thread rolled hem Program 12 Note: The converter (see page 32) must be attached to sew the 2 thread rolled hem. The upper needle thread (green) is too tight. Set the green thread tension to a lower value and/or the yellow thread tension to a higher value. The lower looper thread (yellow) is too tight. Set the yellow thread tension to a lower value and/or the green thread tension to a higher value.
2-thread rolled hem (folded) Program 13 Note: The converter (see page 32) must be attached to sew the 2 thread rolled hem. The upper needle thread (green) is too loose. Set the green thread tension to a higher value and/or the yellow thread tension to a lower value. The lower looper thread (yellow) is too loose. Set the yellow thread tension too a higher value.
2-needle 3-thread assembly seam The lower needle thread (blue) is too loose. Program 10 Set the blue thread tension to a higher value. Note: The converter (see page 32) must be attached to sew the 2-needle 3-thread assembly seam. The upper needle thread (green) is too loose. The lower looper thread (yellow) is too tight. Set the green thread tension to a higher value. Set the yellow thread tension to a lower value.
Thread chart for 2- , 3- and 4-thread overedge seams Fabric Thread Stitch length Light fabrics: organdy, fine knitwear, taffeta, silk, lining fabrics Cotton no. 50 - 70 Synthetic thread no. 70 - 140 2.0 - 4.0 mm Medium heavy fabrics: cotton, tricot, linen, dress fabrics Cotton no. 40 - 60 Synthetic thread no. 70 - 140 2.0 - 4.0 mm Heavy fabrics: tweed, suit fabrics, denim, heavy cloth Cotton no. 30 - 50 Synthetic thread no. 70 - 140 2.0 - 4.0 mm Knitwear: Cotton no. 40 - 60 Synthetic thread no.
Machine maintenance Cleaning the machine Switch off the electrical power Remove the waste container and open the looper cover and swivel plate. Disengage the upper blade (see page 30) and remove the presser foot and the needle plate. Use the accessory brush provided to remove any waste thread from the upper and lower blades, the differential feed and the looper area. Lubricating the machine Cleaning the rubber feet Switch off the electrical power Move the upper overedge looper into its highest position.
Changing the upper blade Switch off the electrical power To remove: Set the adjusting knob for seam width to 3.5 mm. Fasten the upper blade (see page 39) before loosening the fastening screw (A) with the wrench provided in the accessory box. Then remove the upper blade. To insert: Attach the new upper blade and gently tighten the fastening screw. Then turn the handwheel until the upper blade is in the lowest position. In this position the front edge of the upper blade must be 0.5 to 1.
Changing the light bulb Switch off the electrical power Using the screw driver in the accessory box loosen the fastening screw to the sewing light cover 16 until the cover can be removed. Push the light bulb fully into its socket. Rotate counter clockwise through half a turn and remove. Guide the new light bulb (max. 15 W) into the socket and twist until both pins on the bulb click into place. Press the bulb right into the socket, twisting it clockwise until it is securely fixed.
Sewing problems and their solutions This machine has been developed with ease of operation in mind. No difficult or tricky set tings need to be made. Sewing problems of the kind described below may occur as a result of minor adjustment and operating errors. They can be easily adjusted by following the in structions. Problem Cause Solution Needle breakage The needle was bent or the point damaged. Insert new needle (see page 13). The needle was not fully inserted. Insert needle fully (see page 13).
Optional accessories This machine offers a wide range of optional accessories for special serging details. Consult your PFAFF dealer. Optional accessory Order No. Use Multi-purpose foot M 29 924 993 82-002 Foot, to which guides Hl, H2 and H3 can be attached. Lace and braiding guide Hl 29 924 993 82-003 Guide for applying lace or braiding (to the under side of the fabric). Hemmer guide H2 29 924 993 82-001 Guide for hemming/turns under one inch while serging.
Optional accessory Order No. Use MuIti-purpose foot C 29 924 993 82-017 For sewing on bands, elastic tape, elastic thread and fishing line together with the various elastic tape inserts. Elastic tape insert 7.5 mm 29 924 993 82-034 For sewing on elastic tape with a width up to 7.5 mm. Elastic tape insert 10 mm 29 924 993 82-035 For sewing on elastic tape with a width from 7.5 mm - 10 mm. Elastic tape insert 13 mm 29 924 993 82-036 For sewing on elastic tape with a width from 10 mm - 13 mm.
Specifications Maximum sewing speed Seam width Cover stitch width Stitch length Presser foot Lubrication Presser foot height Overedge stroke Needle system Needle siw Number of threads Dimensions (width x height x depth) Weight 1300 stitches/min. 1.4 mm - 9.0 mm 5 mm 0.5 mm - 4 mm exchangeable manual 4.5 mm 2.0 mm EL X 705, cat no. 2002 80/12, 90/14 2,3,4,5 355 x 290 x 300 mm 8.
Intellectual property Patents protecting this product are listed on a label positioned underneath the sewing machine. PFAFF and IDT (image) are registered trademarks or trademarks of VSM Group AB.
Parts of the coverlock 4852 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Thread guides with color coding Telescoping thread guide Thread chain cutter Thread spool stand Thread spool pin Cone thread adapter Spool disc Electrical power master switch Machine socket, foot control Handwheel Regulator wheel for differential feed Stitch length adjustment knob Presser foot lifter Rear thread guides 45 46 47 48 49 50 Waste container Foot control Foot control plug for machine Power cord Accessory box Power table
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