Brother rh-918a manual Adjusting the thread tension, Reference values, Upper thread tension

Page 54

7. SEWING

7-3. Adjusting the thread tension

Turn off the power.

Never adjust the thread tension while sewing.

<Reference values>

 

Woolen materials + wool gimps

Denim (3 layers)

 

 

 

Upper thread tension

0.9 N

1.0 N

 

 

 

Lower thread tension

0.3 N

0.8 N

 

 

 

Thread take-up spring tension

0.05 N

0.07N

 

 

 

Thread take-up spring stroke

8 mm

8 mm

 

 

 

Upper and lower thread

# 30 polyester

# 30 cotton

 

 

 

* If you change the type of material being used, it may be necessary to change the thread tension.

The upper thread tension given above is the tension when the upper thread is pulled out from the thread path hole of the thread take-up lever, and the lower thread tension is when the lower thread is pulled out from the needle hole in the throat plate.

Upper thread tension

Lower thread tension

 

 

 

 

 

 

3059Q

Turn the upper thread tension adjustment knob (1) in the direction indicated by the arrow to increase the upper thread tension.

3060Q

Turn the lower thread tension adjustment knob (2) in the direction indicated by the arrow to increase the lower thread tension.

Adjusting the lower thread take-up spring tension and stroke

Tension adjustment

Loosen the screw (3) and turn the thread take-up spring support (4) in the direction indicated by the arrow to increase the tension of the spring (5).

Stroke adjustment

Loosen the screw (6) and turn the thread take-up spring guide (7) in the direction indicated by the arrow to increase the stroke of the spring (5).

3061Q

47

RH-981A

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Page 53 Page 55
Contents RH-981A Safety Instructions SymbolsIndications Environmental requirements Sewing 3122Q Contents Changing Functions Using Fly indexer -52 specifications Names of Each PartSpecifications SpecificationsFly indexer specifications -52 specifications Sewing shape Optional partsPD-9810, Programmer Replacement parts list for specification changes SpecificationsInstallation Table processing diagramInstalling the motor Installing the motor pulley Installing the control boxInstalling the machine head Raising the machine head Lowering the machine headInstalling the oil container Installing the operation panelTightening the V-belt Installing the air unit and the valve unit Installing the spool standInstalling the hand switch Connecting the valve cablesConnecting the wiring Connections inside the control box P18 PanelConnecting the motor cables Connecting the air tubesSecuring the cables To increase the air pressure Installing the air tubesAdjusting the air pressure To decrease the air pressureConnecting the power cord Installing the programmer sold separately Installing the foot switch optionInstalling the indexer option Installing the indexer main unitInstalling the upper thread presser Installing the valve unitReplacing the plate presser and presser plate Connecting the connectors Securing the air tubes and cables Installing the hand switch Lubrication LubricationAdding oil Filling the arm oil tankOiling the looper, spreader and looper base Removing the work clamp platesCorrect USE Data initializationChanging the lower thread and gimp trimming Installing the needle Threading the upper threadFor upper thread trimming specifications For upper and lower thread trimming specifications -01, -02Threading the lower thread Threading the gimp 02,-52Setting the material 00, -01, -02 specificationsSpecifications Cloth setting position When set to the left setting positionHorizontal setting position Installation position Standard specificationLarge size specification Replacing the PROMs Operation Name and function of each operation panel itemStarting up Program setting method Parameter table Taper barOperation OFF Parameter table Straight bar tacking Operation OFF Cycle program Using the program memos Program memo contentsProduction counter Sewing Automatic sewingUsing the Emergency Stop switch Adjusting the thread tension Reference valuesUpper thread tension Needle and knife position Relationship between knife position and eyelet shapeExplanation of the cutting space function Setting the feed bracket to the front position Switching between single-pedal and dual-pedal operationUsing test feed mode Using manual mode Changing the mode during an operation Moving the cloth feed bar -52 specificationsCleaning and Maintenance CleaningDraining the oil Checking the air filterSpreader height Standard AdjustmentsAdjusting the height of the spreader and looper Looper heightAdjusting the needle and looper timing Adjusting the loop stroke Adjusting the height of the needle bar Adjusting the clearance between the looper and needleAdjusting the needle guard Adjusting the spreader mounting positionsAdjusting the spreader timing Adjusting the needle racking width stitch widthChanging the knife cutting length Replacing the hammer Adjusting the contact between the knife and the hammer Adjusting the contact between the knife and the hammerFiling the cutting surface of the hammer Adjusting the cutting pressure Replacing the knifeAdjusting the position of the work clamp plate Adjusting the cloth opening amount Measuring the opening amountAdjusting the trimming of the upper thread Adjusting the trimming of the lower thread and gimpLower thread presser -02, -52 specifications Auxiliary clamp arm -02, -52 specifications Adjusting the cloth feeding speed -52 specificationsAt the time of shipment 3110Q Adjusting the indexer hole spacing -52 specifications Using the set screw collarAdjusting the position of limit switch L -52 specifications Adjusting the position of limit switch R -52 specificationsChanging Functions Using the Memory Switches Memory switch table Changing Functions Using the DIP Switches Panel DIP switchesCircuit board DIP switches Circuit board DIP switch CCircuit board DIP switch D List of Error Codes Errors after power is turned onErrors during operation Hardware errors Skipped stitches occur TroubleshootingProblem Cause Remedy Thread breaks Needle breaksLower thread is not cut Problem Cause Remedy Upper thread is not cutCleanly Thread slips out118-981

rh-918a specifications

The Brother RH-918A is a versatile and innovative machine tailored for both personal and professional use. As a robust electronic sewing machine, it combines functionality and user-friendly features that cater to a wide range of sewing enthusiasts, from beginners to advanced users.

One of the standout features of the Brother RH-918A is its extensive stitch selection. With over 100 built-in stitches, including decorative stitches, utility stitches, and heirloom stitches, users have ample options to choose from, allowing for creativity and customization in every project. The machine also incorporates an easy-to-use stitch selector dial, making it simple for sewists to navigate and find the perfect stitch for their needs.

Another key characteristic of the RH-918A is its automatic needle threader. This time-saving feature allows users to thread the needle effortlessly, reducing eye strain and frustration, especially for those who may struggle with manual threading. Additionally, the top-loading bobbin system facilitates quick bobbin changes and ensures smooth feeding, enhancing overall sewing efficiency.

The machine is equipped with a powerful motor that provides consistent and strong stitches, able to handle various fabric types, from lightweight cotton to heavier materials like denim and canvas. This capability is critical for crafting garments, home décor items, and more intricate projects.

The Brother RH-918A also boasts several convenient features to enhance the user experience. An LED light illuminates the sewing area, making it easier to work on detailed projects, particularly in low-light environments. Furthermore, the machine includes multiple presser feet, such as a zipper foot, buttonhole foot, and walking foot, to expand its functionality and accommodate different sewing techniques.

For enhanced stability, the Brother RH-918A comes with a sturdy metal frame, ensuring durability and precision. Its intuitive interface, comfortable handwheel, and adjustable stitch length and width settings add to the overall ease of use, making sewing enjoyable for everyone.

In summary, the Brother RH-918A combines a wide range of stitches, user-friendly technologies, and robust build quality, making it an excellent choice in the world of sewing machines. Whether for basic repairs or elaborate creations, this machine stands out for its performance and reliability, appealing to a diverse audience of sewing enthusiasts.
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