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Global BM 345 Mechanic's Instructions

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INDUSTRIAL SEWING MASCHINES
BM 345
PRODUCED BY
Mechanic´s Instrutions

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Summary of Contents for Global BM 345

  • Page 1 INDUSTRIAL SEWING MASCHINES BM 345 PRODUCED BY Mechanic´s Instrutions...

  • Page 3: Table Of Contents

    Mechanic´s instructions BM345 Table of contents General notes on safety ....................5 General notes ....................... 7 Operating instructions ..................7 Class designations, machine number and initial basis for descriptions ....7 Applications of the machine ................7 Technical data of machine ................. 8 Notes on repair and adjustments ..............

  • Page 5: General Notes On Safety

    General notes on safety Failure to comply with the following safety instructions can lead to bodily injury or damage to the machine. The machine must only be operated by persons familiar with the relevant operating instructions and who have been instructed accordingly. Before commissioning also read the notes on safety and the operating instructions of the sewing drive manufacturer.
  • Page 6 13. Warning instructions given in the operating instructions that pertain to especially dangerous parts of the machine must be indicated at these positions using a safety symbol. Warning instructions given in the operating instructions that pertain to special injury hazards for operating personnel or technicians must be indicated at these positions using a safety symbol.

  • Page 7: General Notes

    General notes Operating instructions Every person in charge of setting up, operating, servicing and repairing the machine must first read and understand the operating instructions and particularly the safety instructions before starting up the machine. Class designations, machine number and initial basis for descriptions The operating side of the machine is the initial basis for left/right descriptions.

  • Page 8: Technical Data Of Machine

    Technical data of machine Stitch number: Mechanical maximum: 3000 min Recommended nominal stitch number: 2200 min Belt pulley diameter/machine dw 80 mm V-belt profile 10 × 6 mm Tooth-belt pulley/machine Z = 38 Tooth-belt profile HTD 5M-9 Stitch length 5–8 mm adjustable Stitch type Single thread-chain stitch-blind stitch Interval:...
  • Page 9 Abridged version of adjustment manual for BM345 Theoretical needle radius: 41.3 mm Left needle guide: 41.33 +0.02 mm Needle slide plate: 41.30 ±0.01 mm Right needle guide: 41.36 +0.05 mm Needle stroke, eye of needle to gripping finger: 1.5 +0.5 mm Ball pin to needle shaft: 2 ±0.5 mm Slit in ball pin:...

  • Page 10: Notes On Repair And Adjustments

    Notes on repair and adjustments CAUTION! Injury hazard! Read the safety and operating instructions before performing maintenance and/or repair work. Failure to comply with them can lead to severe bodily injury. Needle plate assembly CAUTION! Injury hazard! Switch off the machine electrically! Needle plates are adjusted at the factory and can be easily exchanged in their entirety.

  • Page 11: Installing The Needle Plate

    2.6.2 Installing the needle plate Install the needle plate in the reverse order. The needle plate opening must lie centrally relative to the presser and the needle plate must lie horizontally. Install in the reverse order. Ensure that the needle plate opening lies centrally relative to the presser and that the needle plate lies horizontally.

  • Page 12: Adjusting The Cloth Retainer (Figure 2)

    2.6.5 Adjusting the cloth retainer (figure 2) After replacing the needle plate, check whether the cloth retainer (7) figure 3 lies centrally on the presser. This is particularly important for roof-shaped pressers/cloth retainers to ensure that the material is optimally held during sewing.

  • Page 13: Needle Lever

    Needle lever 2.7.1 Assembly CAUTION! Switch off the machine electrically! Remove screw (10) figure 5, move the thread feeder and remove the needle lever. During installation, please ensure that the needle runs through the centre of the needle groove and the needle tip is flush with the left needle guide (figure 4).

  • Page 14: Adjusting The Needle Stroke (Figure 5, Figure 6 And Figure 8)

    2.7.2 Adjusting the needle stroke (figure 5, figure 6 and figure 8) For a loop stroke of 2.3–3.0 mm, the needle stroke must be set to that the left side of the needle’s eye is approx. 1.0 +0.5 mm away from the large gripping finger when the tip of the large gripping finger is above the centre of the needle (figure 8).
  • Page 15 Figure 5 Figure 6...

  • Page 16: Loop Stroke

    Loop stroke The loop stroke is the path of the needle from its right reversal point to the point where the tip of the large gripping finger stands above the centre of the needle. (Figure 8) 2.8.1 Adjusting the loop stroke Caution! Switch off the machine electrically! In the factory setting, the loop stroke is 2.3–3.0 mm.

  • Page 17: Gripper

    Gripper Removing and installing the gripper (figure 5) CAUTION! Switch off the machine electrically! After removing the fillister head screw (9), the gripper can be removed from the front. When installing, ensure that the fastening surface of the gripper lies within the chuck and is fully inserted.

  • Page 18: Adjusting The Gripper (Figure 8)

    2.9.3 Adjusting the gripper (figure 8) At the moment when the loop is picked up, the gripping finger must lie 0.1–0.2 mm above the needle. This must also be observed when changing the needle thickness. It is essential to prevent needle contact from occurring! The horizontal distance from the large gripping finger to the eye of the needle should be 1.5 +0.5 mm (figure 8).

  • Page 19: Transporters

    2.10 Transporters The machine is equipped ex works with the pyramid-toothed transporter. After loosening the two screws, its motion towards the needle plate can be adjusted. 2.10.1 Adjusting the transporter (figure 9) CAUTION! Injury hazard! Switch off the machine electrically! 1.

  • Page 20: Transport Brackets

    2.11 Transport brackets 2.11.1 Adjusting the transport brackets CAUTION! Injury hazard! Switch off the machine electrically! The position of the transport brackets is given by the position of the angle lever symmetrical to the presser. It should tip lightly and lie evenly against the needle plate.

  • Page 21: Presser

    2.12 Presser CAUTION! Injury hazard! Switch off the machine electrically! The BM345 is equipped with a rigid, roof-shaped presser of radius 24.5 mm. 2.12.1 Replacing the presser shaft (figure 10) 1. Unscrew the material support arm extension (2). 2. Remove the clamping screw (1). 3.

  • Page 22: Adjusting The Presser (Figure 11)

    2.12.2 Adjusting the presser (figure 11) Remove the clamping screw on lever (1) figure 10. For blind stitches, the adjustment must be made according to figure 11b for thick materials and figure 11c for thin materials. The presser is situated in the centre of the needle plate opening and is usually offset by 1 mm to the left of the needle shaft’s centre.

  • Page 23: Adjusting The Material Support Arm

    2.12.3 Adjusting the material support arm Turn the main shaft until the needle tip stands 1–2 mm behind the centre of the presser. Adjust the control knob (4) figure 12 so that the needle is lifted by 0.2 mm, then screw in the threaded pin (5) figure 12 until it lies against the case. Next, counter the threaded pin (6) figure 12.
  • Page 24 Figure 12...
  • Page 25 Global International BV Hendrik Figeeweg 4 2031 BJ Haarlem Holland Phone: +31 23 531 95 84 Fa x: +31 23 531 10 22 E%Mail: info@globalsew.com E%Mail: globalparts@planet.nl www.globalsew.com...

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