1. Product description 1.1 Proper use The Dürkopp-Adler 739-23 sewing machine has been specifically designed for the processing of lightweight and medium weight materials. Such materials generally consist of textile fibres and is used in the clothing industry. The sewing machine can within certain limitations also be used for technical seams.
1.2.2 Sewing machine head – Single-needle double lockstitch machine – The seam beginning and end are locked by means of tacks (single tacks, double tacks) or stitch condensation. – Thread cutter – An electronic thread monitor ensures that the machine is not restarted in the event of a thread break or if the bobbin is empty.
Operating pressure: 6 bar Air consumption: 0.05 NL per cycle Nominal voltage: 190 - 240 V, 50/60 Hz Dimensions: Table height: 820 - 1080 mm Weight: 230 kg Noise level : Lc = 80 dB (A) Emissions per workplace according to DIN 45635-48-B-1 Stitch length: [mm] Number of stitches:...
Operation of the sewing machine head 2.1 Recommended threads The following core spun threads cater for high quality seams and interruption-free processing: Double polyester endless polyester spun (e.g. Epic Poly-Poly, Rasant x, Saba C, etc. ) double polyester endless cotton spun (e.g. Frikka, Koban, Rasant, etc.) If these products are not available, use the cotton and polyester threads listed in the table.
2.2 Replacement of needle Caution: risk of injury! Switch off main switch. Never replace needle while the main switch is on. – Loosen screw 1 and remove needle from the needle bar 2. – Insert new needle to the stop in the hole in the needle bar 2. Caution! The needle scarf must face away from the operator and towards the hook.
2.3 Inserting of needle thread Caution: risk of injury! Switch off main switch. Never insert the needle thread while the main switch is on. To insert the needle thread, please proceed as shown in the above figures and in sequence of the numbers. –...
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Fig. A: Correct thread run at the centre of the sewing material Fig. B: Insufficient needle thread tension excessive bobbin thread tension Fig. C: Excessive needle thread tension insufficient bobbin thread tension 1-12...
2.5 Adjustment of needle thread tension Main tension The main tension 1 must be set to the lowest possible value. The looping of the threads must be positioned at the centre of the sewing material. In thin materials, excessive thread tensions can result in gathering or breaking threads.
2.7 Adjustment of needle thread regulator Caution: risk of injury! Switch off main switch. Never adjust thread regulator while the main switch is on. The thread regulator 2 controls the length of thread that is necessary for a stitch. Good seams can only be achieved, if the thread regulator is adjusted to the correct value.
2.8 Winding of bobbin thread The bobbin thread is automatically wound up during the sewing operation, provided that winder flap 2 is closed. – Remove all threads from the bobbin hub. – Place yarn reel onto the yarn stand. – Insert thread through hole 1.
2.9 Replacement of bobbin Caution: risk of injury! Switch off main switch. Always switch off main switch before you replace the bobbin. Removing bobbin – Switch off main switch – Press down cover plate 1. – Lift bobbin case flap 2. –...
2.10 Adjustment of bobbin thread tension Caution: risk of injury! Switch off main switch. Never adjust bobbin thread tension while the main switch is on. The required bobbin thread tension must be generated by means of tension spring 5. The brake spring 1 must be fully reset. Adjustment of tension spring –...
2.11 Inserting of needle and bobbin thread in thread scissors To ensure that the sewing machine is able to continue sewing after the replacement of a reel or bobbin, the needle and bobbin thread must be inserted into thread scissors 2. –...
Inserting of material in material clamps Example: Inserting of a pocket flap – Place material clamp 1 onto holder 2. – Open material clamp – Place lining material 5 with the right side upwards into the material clamp. – Place outside fabric 4 with the right side downwards into the material clamp.
Switching on of sewing machine and infeed of material clamps 4.1 Switching on of sewing machine – Switch on main switch 1. The control system is initialised. The start message is displayed. Prior to working with the sewing machine, the sewing axes must be positined in the reference position.
4.2 Infeed of material clamps “ESC” “OK” Caution: risk of breakage! Do not insert material clamps that are not properly closed. – Place mateial clamp on guide rod 1 and press until it is engaged in the toothed profile 2. 4.3 Starting of sewing operation –...
Maintenance 5.1 Tilting of machine head For maintenance work to be carried out below the base plate, the sewing machine head can be swiveled backwards and placed on the machine support. Caution! Risk of injury! Switch off main switch. – Loosen clamping lever 3.
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Maintenance tasks Description Operating to be carried out hours Sewing machine head - Remove dust, pieces of thread Areas requiring special attention: - Area around the bobbin 1 cut-offs - around the thread lever 2 (e.g. with pressure air gun) - around the edge cutter 3 Control cabinet - Remove sewing dust...
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aintenance tasks Description Operating to be carried out hours Waste container Empty waste container 5. Extractor system Empty dust bag 4. Pneumatic system - Inspect water level at pressure The water level may not reach the filter cartridge 6. regulator. - Drain water (under pressure) from water separator 8 by turning the drain screw 7.
5.3 Lubrication Caution! risk of injury! Lubricants may cause irritation to skin.Therefore avoid all contact with skin. If skin is contaminated, clean thoroughly with plenty of water. CAUTION! The handling and disposal of mineral oils is regulated by law. Oil must be disposed of through authorised dealers.
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