The Global WF 955 is an industrial sewing machine designed for heavy-duty stitching, as indicated by its "Instruction & Parts Manual" and the robust nature of its components. It is a specialized machine, likely for upholstery, leather, or other thick materials, given the emphasis on presser foot adjustments and thread tensions suitable for substantial fabrics.

Function Description

The Global WF 955 is a sewing machine that performs stitching operations. Its core function involves forming stitches by coordinating the movement of a needle, a rotating hook, and a feed dog. The machine is equipped with mechanisms for winding bobbins, threading the upper and lower threads, and regulating thread tensions to ensure balanced stitches. It features an alternating presser foot system, which is crucial for feeding multiple layers of thick material evenly. The stitch length is adjustable, and it includes a reversing lever for back-tacking or reinforcing stitches. The machine's design suggests it is built for continuous operation in an industrial setting, with a focus on durability and precise control over the sewing process.

Important Technical Specifications

Max. Sewing Speed: 2000 rpm (revolutions per minute), indicating a high production capacity.
Stitch Length: 0-8 mm, offering a wide range of stitch lengths for various applications.
Take-up Lever Stroke: 71.5 mm.
Needle Bar Stroke: 35 mm.
Height of Between Main and Sub Presser Foot: 2-5 mm, allowing for varying material thicknesses.
Presser Foot Lift: 8 mm (by hand), 14 mm (by knee), providing ample clearance for thick materials.
Needle System: DPx17, with recommended sizes 22# and 24#, suitable for heavy-duty threads and materials.
Rotating Hook: Double Capacity Hook, which reduces the frequency of bobbin changes, enhancing productivity.
Lubrication: Manual, requiring the operator to apply oil at specified points.
Motor: 370W Clutch Motor, a common type for industrial sewing machines, known for its power and control.

Usage Features

The Global WF 955 offers several features designed to enhance usability and control during sewing operations:

Winding and Bobbin Management: The machine includes a bobbin winder with adjustable tension and fill capacity. The process of removing and inserting the bobbin case is detailed, emphasizing proper handling to prevent thread tangles. The double capacity hook minimizes interruptions for bobbin changes, which is a significant advantage in high-volume production.
Threading System: A comprehensive threading path is outlined, guiding the operator through various tension discs, thread guides, and the take-up lever, culminating in threading the needle. This detailed guidance ensures correct thread tension and smooth operation.
Thread Tension Regulation: Both upper (needle) and lower (bobbin) thread tensions are independently adjustable. The manual provides clear visual examples of well-balanced, upper-thread-strong, and lower-thread-strong stitches, enabling operators to achieve optimal stitch quality for different materials and threads.
Presser Foot Adjustments: The machine features an alternating presser foot system, crucial for feeding thick and uneven materials. The lift height of the alternating presser feet can be adjusted to match material thickness, ensuring consistent feeding. The pressure on the material exerted by the presser feet is also adjustable via a screw, allowing fine-tuning for various fabric types.
Stitch Length Control: A dial and reversing lever allow for precise adjustment of stitch length, with numeric figures indicating the length in millimeters. The reversing lever facilitates back-tacking for stitch reinforcement.
Feed Dog Adjustments: The height and relative position of the feed dog to the needle plate are adjustable. This allows for optimization of material feeding, preventing puckering or uneven stitches, especially with challenging materials.
Needle Bar Adjustments: The height of the needle bar and the timing between the hook and the needle are critical for proper stitch formation. The manual provides specific measurements and procedures for these adjustments, ensuring the needle's scarf aligns correctly with the hook point for loop formation.
Vibrating Presser Foot Timing: The timing of the vibrating presser foot relative to the needle and feed dog is adjustable. This feature ensures that the material is held firmly during needle penetration and released at the appropriate time for feeding, preventing irregular stitches.
Thread Controller Spring Adjustment: The thread controller spring's action and tension can be adjusted to manage thread slack, which is vital for consistent stitch formation and preventing thread breakage.

Maintenance Features

The Global WF 955 manual highlights several key maintenance aspects to ensure the machine's longevity and optimal performance:

Initial Cleaning and Examination: Before first use, the machine requires thorough cleaning to remove rust-preventive grease and dust. A detailed examination for loose or deformed parts, running obstructions, and abnormal noise is recommended, emphasizing the importance of pre-operation checks.
Oiling: The manual specifies numerous oiling points, marked with arrows in diagrams, and recommends the use of white spindle oil. The lubrication of the rotating hook is particularly detailed, with instructions for adding oil and adjusting its flow rate via a dedicated screw. Regular manual lubrication is crucial for reducing friction and wear on moving parts.
Adjustments for Wear and Tear: Many components, such as the needle bar, presser feet, feed dog, and thread tensions, are designed with adjustability to compensate for wear or to adapt to different sewing requirements. This allows for the machine to be maintained in optimal working condition over time.
Parts Manual: The inclusion of a comprehensive parts manual with exploded diagrams and part numbers (e.g., A.ARM BED AND ITS ACCESSORIES, B.THREAD TAKE-UP AND UPPER SHAFT MECHANISM, C.LOWER SHAFT AND VERTICAL AXIS MECHANISM, D.STITCH REGULATOR MECHANISM, E.LOWER FEEDING MECHANISM, F.NEEDLE BAR FEEDING MECHANISM, G.PRESSER FOOT MECHANISM, H.ACCESSORIES) is a critical maintenance feature. It enables easy identification and ordering of replacement parts, facilitating repairs and minimizing downtime. Each part is listed with its number, name, quantity, and sometimes remarks (e.g., screw dimensions), simplifying the maintenance process.
Safety Precautions: The manual emphasizes safety during maintenance and operation, instructing users to turn off power before making adjustments, installing/removing belts, or leaving the machine. This ensures operator safety and prevents damage to the machine during maintenance tasks.

Global WF 955 - Page 19

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