Brother rh-918a manual Adjusting the trimming of the upper thread

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9. STANDARD ADJUSTMENTS

9-16. Adjusting the trimming of the upper thread

The upper thread should be trimmed at the correct time after sewing is completed.

<-00, -01>

Adjust so that the upper movable knife (1) cuts only one of the threads in front of the right looper (2). Note: If both strands of the thread loop are cut, the

thread remaining in the needle may become too short and skipped stitches may result.

3100Q

3101Q

<-02,-52>

Adjust so that the upper movable knife (3) cuts only one of the threads in front of the right looper (4). Note: If both strands of the thread loop (forward and

back) are cut, the thread remaining in the needle may become too short and skipped stitches may result.

9-17. Adjusting the trimming of the lower thread and gimp

<-00, -01>

The lower thread and gimp should be trimmed at the correct time after the feed bracket has returned to the home position.

Thread trimming operation can be checked in steps while manual mode is active. (Refer to “7-8. Using manual mode”.)

3102Q

 

 

 

3103Q

 

 

 

 

 

 

 

1.The mechanism is adjusted so that the lower thread and gimp are separated from each other and spread by the thread handler (1).

2.The lower thread is held between thread nipper M (2) and thread nipper D (3) on the plate spring.

The gimp is held between thread nipper M (2) and thread nipper U (4) on the plate spring.

3.Adjust so that the edge of the fixed knife (6) and the index mark (8) on the movable knife (7) are aligned when the thread trimmer arm (5) is at the maximum stroke.

RH-981A

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Contents RH-981A Symbols Safety InstructionsIndications Environmental requirements Sewing 3122Q Contents Changing Functions Using Names of Each Part Fly indexer -52 specificationsSpecifications SpecificationsFly indexer specifications -52 specifications Optional parts Sewing shapePD-9810, Programmer Specifications Replacement parts list for specification changesTable processing diagram InstallationInstalling the motor Installing the control box Installing the motor pulleyInstalling the machine head Lowering the machine head Raising the machine headInstalling the operation panel Installing the oil containerTightening the V-belt Installing the hand switch Installing the spool standInstalling the air unit and the valve unit Connecting the valve cablesConnecting the wiring P18 Panel Connections inside the control boxConnecting the air tubes Connecting the motor cablesSecuring the cables Adjusting the air pressure Installing the air tubesTo increase the air pressure To decrease the air pressureConnecting the power cord Installing the foot switch option Installing the programmer sold separatelyInstalling the indexer main unit Installing the indexer optionInstalling the valve unit Installing the upper thread presserReplacing the plate presser and presser plate Connecting the connectors Securing the air tubes and cables Installing the hand switch Adding oil LubricationLubrication Filling the arm oil tankRemoving the work clamp plates Oiling the looper, spreader and looper baseData initialization Correct USEChanging the lower thread and gimp trimming Threading the upper thread Installing the needleFor upper and lower thread trimming specifications -01, -02 For upper thread trimming specificationsThreading the lower thread 02,-52 Threading the gimp00, -01, -02 specifications Setting the materialSpecifications When set to the left setting position Cloth setting positionHorizontal setting position Standard specification Installation positionLarge size specification Replacing the PROMs Name and function of each operation panel item OperationStarting up Parameter table Taper bar Program setting methodOperation OFF Parameter table Straight bar tacking Operation OFF Cycle program Program memo contents Using the program memosProduction counter Automatic sewing SewingUsing the Emergency Stop switch Reference values Adjusting the thread tensionUpper thread tension Relationship between knife position and eyelet shape Needle and knife positionExplanation of the cutting space function Switching between single-pedal and dual-pedal operation Setting the feed bracket to the front positionUsing test feed mode Using manual mode Moving the cloth feed bar -52 specifications Changing the mode during an operationCleaning Cleaning and MaintenanceChecking the air filter Draining the oilAdjusting the height of the spreader and looper Standard AdjustmentsSpreader height Looper heightAdjusting the needle and looper timing Adjusting the loop stroke Adjusting the clearance between the looper and needle Adjusting the height of the needle barAdjusting the spreader mounting positions Adjusting the needle guardAdjusting the needle racking width stitch width Adjusting the spreader timingChanging 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 Replacing the knife Adjusting the cutting pressureAdjusting the position of the work clamp plate Measuring the opening amount Adjusting the cloth opening amountAdjusting the trimming of the lower thread and gimp Adjusting the trimming of the upper threadLower thread presser -02, -52 specifications Adjusting the cloth feeding speed -52 specifications Auxiliary clamp arm -02, -52 specificationsAt the time of shipment 3110Q Using the set screw collar Adjusting the indexer hole spacing -52 specificationsAdjusting the position of limit switch R -52 specifications Adjusting the position of limit switch L -52 specificationsChanging Functions Using the Memory Switches Memory switch table Panel DIP switches Changing Functions Using the DIP SwitchesCircuit board DIP switch C Circuit board DIP switchesCircuit board DIP switch D Errors after power is turned on List of Error CodesErrors during operation Hardware errors Problem Cause Remedy Thread breaks TroubleshootingSkipped stitches occur Needle breaksCleanly Problem Cause Remedy Upper thread is not cutLower thread is not cut 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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