Global LP 8971-I-NP-AUT Instruction Manual Download Page 45 | Manualshive

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Adjustment

7.04

Thread cutter

7.04.01

Thread-pulling knife height

43

Caution: Danger of injury !

Turn the main switch off.
Proceed with the thread cutter setting only with the sewing machine

switched off.

Attention !

When the pressure of the counter knife is set too high this results in a
higher knife wear.

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Summary of Contents for LP 8971-I-NP-AUT

Page 1: ...LP 8971 I NP AUT INSTRUCTION MANUAL www globalsew com info globalsew com ...

Page 2: ...CONTENT 1 Safety 1 2 Specifications 4 3 Controls 5 4 Installation and commissioning 7 5 Preparation 11 6 Care and Maintenance 16 7 Adjustment 20 ...

Page 3: ...hine and must be available to the operating personnel at all times The Instruction Manual must be read before operating the machine for the first time The operating and specialist personnel must to be instructed in the safeguards of the machine and safe work methods It is the duty of the user to operate the machine in perfect running order It is the obligation of the user to ensure that none of th...

Page 4: ...y accessible Never reach into the sewing area while sewing Danger of injury by the needle Never leave objects on the table while adjusting the machine settings Objects can become trapped or be slung away Danger of injury Do not operate the machine without support 1 Danger due to top heavy sewing head Machine can tip over backwards when tilted 2 3 1 4 2 ...

Page 5: ...ts take up lever guard 2 Danger of injury due to the motion of the take up lever On machines with thread lubricator only operate the machine with the eye guard 3 lowered The eye guard 3 protects the eyes from oil particles from the thread lubrication Do not operate the machine without tilt lock 4 Danger of crushing between sewing head and table top 3 ...

Page 6: ... mm Post height 180 mm Sewing head dimensions Length approx 615 mm Width approx 240 mm Height above table approx 500 mm Bedplate dimensions 518 x 177 mm Max speed 2500 spm Connection data Operating voltage 230V 10 50 60 Hz Max power consumption 1 2 KVA Net weight of sewing head approx 65 kg Gross weight of sewing head approx 77 kg Subject to alteration 4 ...

Page 7: ...ised by pressing the knee lever 1 in the direction of the arrow 3 01 Pedal 0 Neutral position 1 Sewing 2 Raiser roller presser 3 Trim sewing threads 3 02 Lever for lifting roller presser The roller presser can be raised by turning lever 1 3 03 Knee lever ...

Page 8: ...setting stitch length 1 3 05 Swing out roller presser 6 The stitch length is set by pressing key 1 and turning the balance wheel When the roller presser is raised it can be swung out by pulling it lightly downwards see arrow ...

Page 9: ...is firm and steady also during sewing 4 01 Installation The site where the machine is installed must be provided with suitable connections for electric current It must be ensured that the standing surface of the machine site Is firm and horizontal and that sufficient lighting is provided for For packing and transportation reasons the table top is in the lowered position The table height is adjuste...

Page 10: ...en sewing head and table top Switch the machine off Danger of injury if the machine is started accidentally Installation and commissioning 4 02 Fitting the reel stand 4 02 01 Fitting the tilt lock 2 1 8 Fit the reel stand as shown in Fig Afterwards insert the stand in the hole of the table top and secure it with the nuts provided ...

Page 11: ...anic check whether the motor of the machine can be operated with the available power supply and that the motor is correctly connected in the junction box If there are any discrepancies the machine must not be operated under any circumstances The machine only be connected to an earthed socket When the machine is running the balance wheel must turn towards the operator If it does not must be changed...

Page 12: ...Installation and commissioning 4 05 Tilted work base 4 06 Mounting the table top 10 ...

Page 13: ...by personnel with the appropriate training For all setting up work the machine must be disconnected from its power supply by turning off the on off switch or removing the plug from the electric power socket Preparation 5 Preparation 5 01 Inserting needle on model Only use needles of system 134 2 1 The Choice of needle depends on the model of the machine and the thread and material used 11 All inst...

Page 14: ...ing bobbin winder spindle 2 and lever 3 Preparation 5 02 Winding the bobbin thread adjusting the primary thread tension The bobbin is filled up during sewing If the threac1 is wound unevenly 12 The thread tension of bobbin 1 can be adjusted by knurled screw 4 The bobbin winder stops automatically when bobbin 1 is full Loosen nut 5 Turn thread guide 6 accordingly Tighten nut 5 ...

Page 15: ...ading the hook thread 5 04 Adjusting the hook thread tension Hook thread tension mean value 13 Sewing category Used needle size Thread tension in grams light 70 80 50 medium 90 110 65 Tilt the shutter 1 up Insert the bobbin 2 with the thread end 3 oriented according to the picture Thread the thread through the slit 4 and space 5 hook upon the shutter 1 and fasten it under the spring 6 Draw the thr...

Page 16: ...y if the machine is started accidentally Tilt up the eye guard 1 Thread the needle thread as shown in Fig Adjust the needle thread tension by turning milled screw 2 Preparation 5 05 Threading the needle thread and regulating its tension 14 ...

Page 17: ...until the stitch setter clicks into position Hold down key 1 and turn the balance wheel to and fro until the stitch length required is shown on the scale 2 opposite the bottom edge 3 of the belt guard recess Preparation 5 06 Setting the stitch length 2 3 1 15 ...

Page 18: ...anger of injury if the machine is started accidentally These maintenance intervals are calculated for the average running time of a single shift operation If the machine is operated more than this shorter intervals are recommended Clean daily more frequently if in continuous operation Oil level thread lubrication hook lubrication daily before use Oil the hook daily before use Lubricate the bevel g...

Page 19: ...3 Remove the bobbin housing 2from the hook Clean the inner area of the hook Clean the bobbin housing particularly look for glue remainder on the surface 4 Check the clearance on the track between bobbin housing 2 and the hook 1 Care and Maintenance Maintenance work Explanation Operating to be carried out hours Remove lint pieces of thread e g with an air blow gun Remove lint pieces of thread e g w...

Page 20: ...owl for hook lubrication 2 1 18 Check the oil level before each use There must always be oil in reservoir 1 If required refill oil through hole 2 Use only oil with a mean viscosity of 22 0mm2 s at 40 and a density of 0 865g cm3 at 15 ...

Page 21: ...l gears Apply grease to all the tooth flanks and the rack see arrows To set the sewing head upright press tilt lock 1 backwards and set the sewing head upright using both hands Use both hands to set the sewing head upright Danger of crushing between the sewing head and the table top We recommend sodium grease with a dripping point of approx 150 Care and Maintenance 6 03 Lubricating the bevel gears...

Page 22: ...checks and adjustments are not mentioned in the text The order of the following chapters corresponds to the most logical work sequence for machines which have to be completely adjusted If only specific individual work steps are carried out both the preceding and following chapters must be observed Screws nuts indicated in brackets are fastenings for machine parts which must be loosened before adju...

Page 23: ...g to the Requirement Requirement With the stitch length set at its minimum the needle should be positioned in the centre of the needle hole as seen in the direction of sewing Adjustment 7 03 Adjusting the basic machine 7 03 01 Needle position in sewing direction 1 21 ...

Page 24: ...p dead centre there must be a clearance of approx 25mm between the needle point and the needle plate Adjustment 7 03 02 Preliminary adjustment of the needle height 22 Adjust needle bar 1 screw 2 Without turning it according to the Requirement ...

Page 25: ...Loosen the two screws 3 and displace the hook column 1 from off the needle to the distance measure B Tighten screws 3 3 Loosen screw 5 position the needle bar and needle to the distance measure A and tighten screw 5 4 Check whether the hook tip 2 is positioned in the range of the needle axis tighten screw 4 Adjustment 7 03 03 Needle bar height play of needle to hook tip 1 2 5 3 4 23 ...

Page 26: ...hten the screws 1 Caution Danger of injury Turn the main switch off Proceed with the hook setting only with the sewing machine switched off Adjustment 7 03 04 Setting of the needle bar and of the hook Hook height Rule The distance A should be 1 0 up to 1 1 mm 1 24 ...

Page 27: ...03 05 Hook tip guard 25 Set the maximum stitch length according to the sewing equipment Dismount the throat plate Position the hook tip2 on the needle and adjust the setting screw of the guard plate 1 by using an Allen key of 1 25 mm 3 so that the needle does not touch the hook tip 2 Checking Exert a light pressure on the needle see arrow and turn the hook at the same time The setting is not incor...

Page 28: ...re A with max release should be 0 5 mm Adjustment 7 03 06 Bobbin housing release 26 Loosen screw 2 by the screwdriver3 set the bobbin housing release 1 so that the distance measure A according to rule is accomplished Tighten screw 2 ...

Page 29: ...olution from the position where the lubrication is fully closed Screw the choking screw 1 by means of a screwdriver 2 and loosen it back by 1 5 revolution according to the rule Check whether the oil lubrication is sufficient Place a sheet of paper near the hook run the machine to full speed and observe whether a trace of sprinkling oil appears on the paper If you want to choke the lubrication scre...

Page 30: ... screws 2 according to Requirement Requirement When the needle with maximum stitch length set coming from top dead centre is 3 mm above the needle plate the crank 3 must have reached its front point of reversal Adjustment 7 03 08 Stitch length control eccentric 2 1 28 ...

Page 31: ...nt Requirement When the stitch length control device is locked in position and the minimum stitch length is set the marking line of the highest number on the scale disk 1 must be opposite the lower edge 2 of the belt guard recess Adjustment 7 03 09 Stitch length scale disk 1 2 29 ...

Page 32: ...shift the shaft crank 1 screw 2 according to the Requirement Requirement When the maximum length is set the linkage rod 3 and 4 must be able to move freely when the balance wheel is turned Adjustment 7 03 10 Shaft crank to feed wheel drive 30 ...

Page 33: ...ew 2 according to the Requirement Requirement When the maximum stitch length is set the linkage rods 3 and 4 must be able to move freely at their left and right point of reversal when the balance wheel is turned Adjustment 7 03 11 Shaft crank to roller presser drive 31 ...

Page 34: ...presser and the feed wheel must be 5 mm Adjustment 7 03 12 Clearance between roller presser and feed wheel 32 Raise the presser bar lifter Adjust the presser bar 1 screws 2 according to the Requirement Make sure that the roller presser is parallel to the feed wheel Switch the machi ne ...

Page 35: ...dle as seen crosswise to the direction of sewing Adjustment 7 03 13 Roller presser 4 3 2 1 5 33 Raise the roller presser Always observe Requirement 1 for subsequent adjustments Adjust roller presser 1 screw 2 according to Requirement 2 Lower roller presser 1 to rest on feed wheel 5 Adjust roller presser bracket 3 screw 4 according to Requirement 3 When sewing very tight curves the roller presser 1...

Page 36: ... 2 according to the Requirement Requirement When the stitch length is set at 3 and after the needle has entered a strip of leather 11 times the total length from the first to last needle penetration must be 30 mm Adjustment 7 03 14 Stitch length on stitch length scale Clamp 1 must not be positioned diagonally to the rock shaft 34 ...

Page 37: ...e upper leather layer Adjustment 调整 Adjustment 7 03 15 Synchronization of roller presser and feed wheel Clamp 1 must not be positioned diagonally to the rock shaft 35 Set stitch length 3 By turning the balance wheel let the needle enter 30 times Compare the total sewn length of the lower and upper leather layer Adjust clamp 1 screw 2 according to the Requirement ...

Page 38: ...lay 2 when the knee lever is raised as far as possible the lever for the roller presser must drop automatically 3 knee lever bar 5 must be at an angle of approx 75 to the bedplate Adjust screw 1 nut 2 according to Requirement 3 Adjust screw 3 nut 4 according to Requirement 2 Set bar 5 screws 6 according to Requirement 3 ...

Page 39: ...ording to Requirement Requirement 1 when the presser bar lifter is raised the tension discs 3 should be pressed at least 0 5 mm apart 2 When the roller presser is lowered the tension must be fully effective Adjustment 7 03 17 Needle thread tension release 37 ...

Page 40: ...may be necessary to deviate from the specified spring stroke or spring tension Move the thread regulator 5 screw 6 towards more thread or less thread Requirement 1 the movement of thread check spring 7 should be completed when the needle point penetrate the fabric spring stroke approx 7 mm 2 when the largest thread loop is formed while the thread is passed around the hook the thread check spring 7...

Page 41: ... disengaged the friction wheel 5 must not be moved by drive wheel 1 2 the bobbin winder must switch itself off her the filled thread is about 1mm from the edge of the bobbin Adjustment 7 03 19 Bobbin winder 39 Position drive wheel 1 screws 2 according to Requirement 1 Position bolt 3 screw 4 according to Requirement 2 ...

Page 42: ...st roller pressure with screw 1 according to the Requirement Requirement The material must be fed smoothly No pressure marks should be visible on the material Adjustment 7 03 20 Pressure of roller presser 40 ...

Page 43: ...til you feel coupling 1 snap back into place again Adjustment 7 03 21 Re engage safety coupling The coupling 1 is set by the manufacturer When the thread jams the coupling 1 disengages in order to avoid damage to the hooks A description of how to engage the coupling follows 2 1 41 ...

Page 44: ...any pressure on the counter knife 3 The cutting pressure between the knives 1 and 3 will develop during the thread pulling knife 1 slight turning to the cutting position due to the elevated position of its cutting edge surface Fix the thread pulling 5 with the screw 2 Adjustment 7 04 Thread cutter 7 04 01 Thread pulling knife height 42 Requirement At the turning to its adjusting position the threa...

Page 45: ...ing knife height 43 Caution Danger of injury Turn the main switch off Proceed with the thread cutter setting only with the sewing machine switched off Attention When the pressure of the counter knife is set too high this results in a higher knife wear ...

Page 46: ...ng knife 1 is locked in the starting position with a needle shank 2 the electric motor shock absorber 4 and the lever 3 should be positioned at the stop Adjustment 7 04 02 Starting position of the thread pulling knife 2 1 6 4 3 5 44 ...

Page 47: ...slightly turn the thread pulling knife 1 to the starting position and lock it with the needle shank 2 Turn the lever 3 in the arrow direction to the stop and then fix it with the screw 5 Remove the needle 2 and mount the throat plate insert back again Caution Danger of injury Turn the main switch off Proceed with the thread cutter setting only with the sewing machine switched off ...

Page 48: ...e up lever 1 is at the top dead position 2 Between the control cam 3 and the roller 4 there should be the distance A 0 1 mm Adjustment 7 04 03 Angle position timing of control cam and clearance between cam and roller 4 1 2 A 3 46 ...

Page 49: ...al key 3 mm 5 The thread take up lever 1 is at the top dead position to the picture Insert the feeler gauge 0 1 mm between the cam 3 and the roller 4 Slide the cam 3 to the left fully to the stop until the clearances inside the mechanism are set Fix the cam 3 with two locking screw with the key 2 Adjustment 7 04 03 Angle position timing of control cam and clearance between cam and roller 47 ...

Page 50: ...bend the spring until the thread is reliably retained with the spring Requirement The clamping force of the spring 1 should be high enough so as the tension needed to pull out the bottom thread is approximately the same as the tension needed to pull this thread from the hook bobbin Adjustment 7 04 04 Bobbin thread clamp 1 48 Caution Danger of injury Turn the main switch off Only adjust the clampin...

Page 51: ...ate the magnet Detach the tension bearing plate 1 and adjust pressure plate 2 Requirement When the magnet is activated tension discs 3 must be at least 0 5 mm apart Adjustment 7 04 05 Releasing the tension 49 ...

Page 52: ...ent Requirement When the maximum stitch length is set the needle must be the same distance from the inside edge of the needle hole both for forward and reverse stitch Adjustment 7 05 Adjusting backtracking mechanism 7 05 01 Needle in needle hole 50 ...

Page 53: ...There must be a distance of 3 mm between coupling half 1 and locking disc 3 of the drive mechanism Adjustment 7 05 02 Coupling for roller presser drive 51 Adjust coupling half 1 screw 2 according to the Requirement ...

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