Brother BAS-311G service manual Replacing the movable and fixed knives

Page 102

7. ADJUSTMENT

7-10. Replacing the movable and fixed knives

5002Q

1.Loosen the two bolts (1) and then remove the feed plate (2).

2.Open the shuttle race cover, remove the two screws (3) and the two flat screws (4), and then remove the needle plate (5).

3.Remove the movable knife (6) and the fixed knife (7).

 

 

 

 

 

 

5003Q

5004Q

 

 

 

4.Install the new fixed knife (7) in the position shown in the illustration.

5.Apply grease to the outside of the collar (8) and to the shoulder screw (9), and then install the new movable knife (6) together with the thrust washer (10) and the movable knife spacer (11).

6.Check that the movable knife (6) and fixed knife (7) cut the thread cleanly. Replace the movable knife spacer with accessory spacers (t=0.2, 0.3, 0.4) so that the knives trim the thread accurately.

*If the knife pressure is too weak and the thread is not completely cut, use a thinner movable knife spacer.

*If the knife pressure is too strong and the movable knife (1) turns stiffly, use a thicker movable knife spacer.

7.Apply grease to the pin (12), place it into the movable knife connecting plate (13), and install it to the needle plate (5).

8.Check that the needle is aligned with the center of the needle hole.

BAS-311G, BAS-326G

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Contents BAS-311G BAS-326G Safety Instructions Environmental requirements Sewing Iii5222Q 4905Q Contents Table of Error Codes Specifications Function Settings List of special functions when power is turned onWhen Speed indicator is illuminated List of advanced functionsDefault settings Memory switch setting method AdvancedMemory switches that have been changed from Ending setting modeList of memory switch settings OFFFor pneumatic specifications 2 pedal Work clamp settingsFor solenoid specifications 1 pedal For solenoid specifications051 Sewing machine motor settings Feed settings Operation panel settings User program settingsData editing settings Device settings554 Thread breakage detector Error processing settings Maintenance settingsSpecifications and destination settings Solenoid specifications, single pedal standard operations Setting the work clamp modeUnique machine settings Solenoid specifications, single pedal sequence operationStitch counter checking method Pneumatic specifications, 2 pedal standard operationsPneumatic specifications, 2 pedal sequence operation Clearing the cumulative number of stitchesError history checking method Input checking method Input check listSele On / oFF Option input IN10 Output checking method CUt Software version checking method Reading / Writing Data Handling dataStructure of a CF card folder \ISMS0102.SEWData read/write mode Turn on the power switch Switch to data read/write modeRead/write mode list When memory switch No is on End data read/write modeReading sewing data from CF cards Select the w 2 data read/write mode Writing sewing data to CF cardsReading memory switch data from CF cards Writing memory switch data to CF cardsReading user program data from CF cards Writing user program data to CF cardsUpdating the control program Writing error log data to CF card Reading sewing data from floppy disksInsert the floppy disk into the floppy disk drive Writing sewing data to floppy disks Reading extended option output data from a CF card Writing extended option output data to CF cards Reading extended option output data from floppy disksNeedle bar and thread take-up mechanisms Lower shaft and shuttle race mechanismsWork clamp lifter mechanism Solenoid specifications Work clamp lifter mechanism Pneumatic specifications Intermittent presser foot lifter mechanismIntermittent presser foot stroke mechanism Feed mechanism DirectionThread trimmer mechanism Tension release mechanism Thread wiper mechanismDisassembly Covers5090Q Pneumatic specifications Work clamp arm mechanismPresser bar Pull downward from presser bar clamp Needle bar mechanism Upper shaft mechanism Lower shaft mechanism Feed covers 5103Q 5104Q 5106Q 5107Q 5118Q Work clamp lifter link Pull backward 5109Q Tension bracket assy Thread trimmer collar Shuttle hook mechanism Assembly Apply grease Stepping clamp lifter rod adjustment Index mark Work clamp lifter plate assy 5164Q 5168Q 5170Q 5171Q 5173Q Flat screws 8 pcs 5178Q Install so that the backlash is 0.01 GT belt tension adjustment 5184Q Inside X-LM guide installation Right Y-LM guide installationFeed bracket Needle plate 5140Q 4644Q Inside hole Inside hole Cut section 5195Q 5198Q 5199Q 5144Q Mating mark Movable knife 5201Q 5200Q Work clamp height adjustment Pneumatic specifications Retainer adjustmentWork clamp height adjustment Solenoid specifications Work clamp adjustment5153Q Shuttle race cover assy Motor cover L Adjustment Checking the machine head switchStandard thread tension Thread take-up spring height Thread take-up spring tensionAdjusting the needle bar height Adjusting the needle bar lift amountAdjusting the driver needle guard Adjusting the needle clearance Adjusting the shuttle race thread guideRotary hook lubrication amount Adjusting the position of the movable knife 4950Q 5237Q 5238Q Replacing the movable and fixed knives Installing the feed plate End feed plate installation modeAdjusting the thread wiper Presser foot installation positionChanging the installation position of stepping clamp link a Changing the intermittent strokeStepping clamp connecting rod position adjustment Solenoid specifications Adjusting the work clamp lift amountAdjusting the air pressure pneumatic specifications Pneumatic specifications101 Adjusting the thread trimmer cam positionBelt tension adjustment GT beltAdjusting the tension release amount Adjustment Y-GT belt102 Adjusting the backlash of the lower shaft gear 103Adjusting the home position 104Y feed home position 105106 Adjusting the needle up stop home position 107Adjusting the needle up stop position Adjustment method108 109 Electric shocks Precautions while carrying out adjustments110 InjuryInside the control box and operation panel structure 111Description of fuses 112Description of connectors 113114 Electrical Mechanism PMD P.C. board115 116 Feed mechanismWork clamp mechanism 117 Thread trimming mechanismSewing operations 118 OtherTroubleshooting Description of symbols119 120 121 122 Before carrying out adjustment 123124 Fig. C OK if there is Continuity between125 Panel126 CN2 Main127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 Lower thread breaks Problem Cause Remedy Reference Upper thread breaks142 Needle is broken143 Segment Display 144I5060885B
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BAS-311G specifications

The Brother BAS-311G is a state-of-the-art industrial sewing machine designed specifically for advanced garment manufacturing. This high-speed, fully automated model is engineered to meet the demands of modern production environments, offering exceptional performance and versatility.

One of the key features of the BAS-311G is its automatic thread trimmer, which significantly reduces downtime and enhances productivity. This machine is capable of cutting the thread at the end of each seam, ensuring a clean finish and minimizing the need for manual intervention. This feature is especially beneficial in high-volume production settings where efficiency is paramount.

The BAS-311G also boasts an advanced automatic needle positioning system, allowing users to set the needle to stop in the up or down position. This functionality enhances control over the sewing process, making it easier to pivot and maneuver fabric, which is crucial for intricate designs and patterns. This precision is a boon for manufacturers looking to improve the quality of their finished products.

Another notable aspect of the BAS-311G is its versatility. The machine is equipped with an adjustable stitch length feature, enabling users to customize stitches according to specific project needs. This flexibility allows for the production of a wide range of garments, from delicate fabrics to thicker materials, making it suitable for various industries including fashion, sportswear, and workwear.

In terms of technology, the BAS-311G incorporates Brother's pioneering technology that ensures smooth and reliable operation. The machine includes a digital control panel, which simplifies the selection of stitch patterns and settings. Users can easily navigate through options, making adjustments on the fly, which is crucial in a fast-paced production environment.

Built with durability in mind, the BAS-311G is engineered for heavy-duty use with high-quality materials that withstand the rigors of daily operation. Its robust construction ensures longevity and sustained performance, making it a wise investment for businesses seeking reliable machinery.

In summary, the Brother BAS-311G is an excellent choice for manufacturers looking to enhance their sewing operations. With features such as automatic thread trimming, adjustable stitch lengths, and advanced technology integration, it stands out as a top-tier industrial sewing machine designed to improve efficiency and quality in garment production.
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