Brother rh-918a manual Adjusting the loop stroke

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9. STANDARD ADJUSTMENTS

9-3. Adjusting the loop stroke

The loop stroke is the distance the needle bar rises from its lowest position to the position where the tips of the eye looper and right looper are aligned with the center of the needle. The standard loop stroke is 2.7 mm. (The loop stroke may need changing depending on the material and thread being used.)

* Carry out the adjustment in "9-2. Adjusting the needle and looper timing" before making this adjustment.

2.7 mm

3079Q

1.In the same way as in "9-2. Adjusting the needle and looper timing", move the needle bar to its lowest position with the needle at the inside sewing position, and then use calipers to measure the distance between the end of the needle bar (1) and the top of the holder base (2).

2.Add 2.7 mm to the value obtained in step 1. above.

3.Touch the end of the calipers (A) against the top of holder base (2), and then turn the upper shaft pulley until the end of the needle bar (1) touches the edge of the calipers (B). Check that the tip of the eye looper is aligned with the center of the needle at this time.

4.In the same way, check that the tip of the right looper is aligned with the center of the needle when the needle is at the outside sewing position.

3080Q

3081Q

5.If the tips of the loopers are not aligned with the center of the needle, carry out the adjustment below. Raise the machine head.

Loosen the two screws (3) of the lower shaft timing pulley, hold the upper shaft pulley so that it doesn't move, and then turn the lower shaft cam (4) in the direction indicated by the arrow until the tip of the eye looper (5) is aligned with the center of the needle (6). Once they are aligned, tighten the two screws (3).

After adjusting, check that the screws have been adequately tightened.

Once this adjustment has been carried out, repeat the procedure given in "9-2. Adjusting the needle and looper timing".

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RH-981A

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Page 63 Page 65
Contents RH-981A Symbols Safety InstructionsIndications Environmental requirements Sewing 3122Q Contents Changing Functions Using Fly indexer -52 specifications Names of Each PartSpecifications SpecificationsFly indexer specifications -52 specifications Optional parts Sewing shapePD-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 spool stand Installing the hand switchInstalling the air unit and the valve unit Connecting the valve cablesConnecting the wiring Connections inside the control box P18 PanelConnecting the motor cables Connecting the air tubesSecuring the cables Installing the air tubes Adjusting the air pressureTo increase 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 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 Lubrication Adding oilLubrication Filling the arm oil tankOiling the looper, spreader and looper base Removing the work clamp platesData initialization Correct USEChanging the lower thread and gimp trimming Installing the needle Threading the upper threadFor upper and lower thread trimming specifications -01, -02 For upper thread trimming specificationsThreading the lower thread Threading the gimp 02,-5200, -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 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 Program memo contents Using the program memosProduction counter Sewing Automatic 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 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 filterStandard Adjustments Adjusting the height of the spreader and looperSpreader height 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 Adjusting the cloth feeding speed -52 specifications Auxiliary clamp arm -02, -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 Troubleshooting Problem Cause Remedy Thread breaksSkipped stitches occur Needle breaksProblem Cause Remedy Upper thread is not cut CleanlyLower 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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