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Global LP 8971-I-NP-AUT Instruction Manual

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LP 8971-I-NP-
AUT
INSTRUCTION MANUAL
www.globalsew.com
info@globalsew.com

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

  • Page 1 LP 8971-I-NP- INSTRUCTION MANUAL www.globalsew.com info@globalsew.com...

  • Page 2: Table Of Contents

    CONTENT 1.Safety …………………………………………………………………………………… 2.Specifications …………………………………………………………………… 3.Controls ………………………………………………………………………………… 4.Installation and commissioning …………………………………… 5.Preparation ………………………………………………………………………… 6.Care and Maintenance ……………………………………………………… 7.Adjustment ……………………………………………………………………………...

  • Page 3: Safety

    Safety Safety 1.01 Safety symbols Danger! Points to be observed Danger of injury for operating and specialist personnel ! Caution Do not operate without finger guard and safety devices. Before threading,changing bobbin and needle, cleaning etc switch off main switch. 1.02 Important points for the user This Instruction Manual is a component of the machine and must be...
  • Page 4 Safety 1.03 Danger A working area of 1 meter is to be kept free both in front of and behind the machine in operation so that the machine is always easily 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...
  • Page 5 Safety Switch the machine off before tilting it backwards! Danger of injury if the machine is started accidentally! Do not operate the machine without its 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!

  • Page 6: Specifications

    Specifications Specifications Stitch type (lockstitch) Stitch length 0-5 mm Clearance under roller presser 5 mm Clearance width 245 mm Clearance height 115 mm Post height 180 mm Sewing head dimensions Length approx. 615 mm Width approx. 240 mm Height （above table） approx.

  • Page 7: Controls

    Controls Controls 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 The roller presser can be raised  by pressing the knee lever 1 in the direction of the arrow.
  • Page 8 Controls 3.04 Key for setting stitch length  The stitch length is set by pressing key 1 and turning the balance wheel . 3.05 Swing out roller presser  When the roller presser is raised, it can be swung out by pulling it lightly downwards (see arrow).

  • Page 9: Installation And Commissioning

    Installation and commissioning Installation and commissioning The machine must only be installed and commissioned by qualified personnel! All relevant safety regulations must be strictly adhered to! If the machine is delivered without a table, be sure to use a stand and table top that can hold the weight of the machine . It is very important to ensure that the stand of the machine is firm and steady, also during sewing.
  • Page 10 Installation and commissioning 4.02 Fitting the reel stand  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. 4.02.01 Fitting the tilt lock Switch the machine off! Danger of injury if the machine is started accidentally!
  • Page 11 Installation and commissioning 4.03 Commissioning  Check the machine, particularly the electrical wiring for any damage.  Clean the machine thoroughly and then oil it or fill oil in .  Have a mechanic 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.
  • Page 12 Installation and commissioning 4.05 Tilted work base 4.06 Mounting the table top...

  • Page 13: Preparation

    Preparation Preparation All instructions and regulations in this Instruction Manual must be observed . Special attention must be paid to all safety regulations! All setting-up work must only be carried out 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.
  • Page 14 Preparation 5.02 Winding the bobbin thread; adjusting the primary thread tension  Place an empty bobbin 1 into bobbin winder spindle 2  Thread the bobbin as shown in Fig. And wind it clockwise around bobbin 1 a few times ...
  • Page 15 Preparation 5.03 Inserting the bobbin and threading the hook thread Switch the machine off ! Danger of injury if the machine is started accidentally !  Tilt the shutter 1 up.  Insert the bobbin 2 with the thread end 3 oriented according to the picture.
  • Page 16 Preparation 5.05 Threading the needle thread and regulating its tension Switch the machine off ! Danger of injury if the machine is started accidentally!  Tilt up the eye guard 1.  Thread the needle thread as shown in Fig. ...
  • Page 17 Preparation 5.06 Setting the stitch length  Press key 1 and at the same time turn the balance wheel 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.

  • Page 18: Care And Maintenance

    Care and Maintenance Care and Maintenance 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 gears…………………………………………once a year 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.
  • Page 19 Care and Maintenance Maintenance work Explanation Operating to be carried out hours Places in special need of cleaning: Remove lint, pieces Area under the throat plate and of thread (e.g. with feeding an air blow gun) roller, top roller and its surrounding. ...
  • Page 20 Care and Maintenance 6.02 Oil bowl for hook lubrication 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 22.0mm 40℃...
  • Page 21 Care and Maintenance 6. 03 Lubricating the bevel gears Switch the machine off! Danger of injury if the machine is started accidentally!  All bevel gears must be supplied with new grease once a year.  Tilt the sewing head back onto the support. Fig.

  • Page 22: Adjustment

    Adjustment Adjustment Unless stated otherwise, during all adjustment work the machine must be disconnected from electric supply! Danger of injury if the machine is started accidentally! 7.01 Notes on adjustment  All following adjustment are based on a fully assembled machine and may only be carried out by expert staff trainned for this purpose.
  • Page 23 Adjustment 7. 03 Adjusting the basic machine 7.03.01 Needle position in sewing direction . 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. ...
  • Page 24 Adjustment 7.03.02 Preliminary adjustment of the needle height Requirement When the needle bar is at top dead centre, there must be a clearance of approx. 25mm between the needle point and the needle plate.  Adjust needle bar 1 (screw 2). Without turning it, according to the Requirement.
  • Page 25 Adjustment 7.03.03 Needle bar height,play of needle to hook tip. Requirement With the needle bar positioned 2.3mm after bottom dead centre , Length A = 1.5 mm, distance B = 0.02 to 0.1 mm: 1.Loosen four screws 4 and turn the hook tip 2 to the needle axis. 2.Loosen the two screws 3 and displace the hook column 1 from off the needle to the distance measure B.
  • Page 26 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.  Loosen screws 1 and set the height A according to the rule.  Tighten the screws 1. Caution: Danger of injury ! Turn the main switch off.
  • Page 27 Adjustment 7.03.05 Hook tip guard Requirement The guard plate of the hook 1 should prevent a contact between the needle and the hook tip 2.  Set the maximum stitch length according to the sewing equipment.  Dismount the throat plate. ...
  • Page 28 Adjustment 7.03.06 Bobbin housing release Requirement The distance measure A with max. release should be 0.5 mm.  Loosen screw 2 by the screwdriver3, set the bobbin housing release 1 so that the distance measure A according to rule is accomplished.
  • Page 29 Adjustment 7.03.07 Hook lubrication Requirement The screw 2 is to be unscrewed by 1.5 revolution 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. ...
  • Page 30 Adjustment 7.03.08 Stitch length control eccentric 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.  Set the maximum stitch length. ...
  • Page 31 Adjustment 7.03.09 Stitch length scale disk 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.
  • Page 32 Adjustment Shaft crank to feed wheel drive 7.03.10 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.  Set the maximum stitch length.  Twist or shift the shaft crank 1 (screw 2) according to the Requirement.
  • Page 33 Adjustment Shaft crank to roller presser drive 7.03.11 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. Set the maximum stitch length.
  • Page 34 Adjustment Clearance between roller presser and feed wheel 7.03.12 Requirement When the presser bar lifter is raised, the clearance between the roller presser and the feed wheel must be 5 mm.  Raise the presser bar lifter.  Adjust the presser bar 1 (screws 2) according to the Requirement.
  • Page 35 Adjustment 7.03.13 Roller presser Requirement When the roller presser 1 is touching the feed wheel 5 it must: 1.be parallel to feed wheel 5, as seen in he direction of sewing. 2.be in the centre of the needle , as seen in the direction of sewing.
  • Page 36 Adjustment 7.03.14 Stitch length on stitch length scale 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. ...
  • Page 37 Adjustment 调整 Adjustment 7.03.15 Synchronization of roller presser and feed wheel Requirement After 30 needle penetrations in a strip cf leather the total length from the first the the last penetration should be the same, both in the lower and the upper leather layer. ...
  • Page 38 Adjustment 7.03.16 Knee lever Requirement 1.before the roller presser rises, the knee lever must still have a slight play. 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.
  • Page 39 Adjustment 7.03.17 Needle thread tension release 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. ...
  • Page 40 Adjustment 7.03.18 Thread check spring 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 should rise slightly from its support.
  • Page 41 Adjustment 7.03.19 Bobbin winder Requirement 1.when the bobbin winder is engaged, the winding spindle must be driven reliably When the bobbin winder is 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.
  • Page 42 Adjustment 7.03.20 Pressure of roller presser Requirement The material must be fed smoothly. No pressure marks should be visible on the material.  Adjust roller pressure with screw 1 according to the Requirement.
  • Page 43 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.  Remove jammed thread. ...
  • Page 44 Adjustment 7.04 Thread cutter 7.04.01 Thread-pulling knife height Requirement At the turning to its adjusting position the thread-pulling knife 1 should touch the counter knife 3 without pressure. Slightly turn the thread-pulling knife 1 so that its locking screw 2 is ...
  • Page 45 Adjustment 7.04 Thread cutter 7.04.01 Thread-pulling knife height 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 Adjustment 7.04.02 Starting position of the thread-pulling knife Requirement If the thread pulling 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.
  • Page 47 Adjustment 7.04.02 Starting position of the thread-pulling knife  Dismantle the throat plate insert in the recess 6.  Loosen the screw 5 with the hexagonal key 3 mm.  With your hand slightly turn the thread pulling knife 1 to the starting position and lock it with the needle shank 2.
  • Page 48 Adjustment 7.04.03 Angle position (timing) of control cam and clearance between cam and roller Requirement 1. The thread take 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.
  • Page 49 Adjustment 7.04.03 Angle position (timing) of control cam and clearance between cam and roller  Loosen both locking screws of the cam 3 with the hexagonal key 3 mm 5.  The thread take up lever 1 is at the top dead position to the picture .
  • Page 50 Adjustment 7.04.04 Bobbin thread clamp 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.
  • Page 51 Adjustment 7.04. 05 Releasing the tension Requirement When the magnet is activated, tension discs 3 must be at least 0.5 mm apart.  Activate the magnet.  Detach the tension bearing plate 1 and adjust pressure plate 2.
  • Page 52 Adjustment 7.05 Adjusting backtracking mechanism 7.05.01 Needle in needle hole 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.  Turn crank 1 (screw 2) according to the Requirement,...
  • Page 53 Adjustment 7.05.02 Coupling for roller presser drive Requirement There must be a distance of 3 mm between coupling half 1 and locking disc 3 of the drive mechanism.  Adjust coupling half 1 (screw 2) according to the Requirement.