Brother DH4-B980 Needle and knife position, Explanation of the cutting space function

Page 39

7. SEWING

7-4. Needle and knife position

The feed bracket is electronically controlled by means of pulse motors.

It is not necessary to change the position of the knife when switching between cutting before sewing and cutting after sewing. It is not necessary to change the needle down position in order to keep enough space for cutting when cutting after sewing has been selected.

Relationship between knife position and eyelet shape

0936Q

Straight section

Knife

ac

bd

Cutting shape (a X b) Eyelet shape (c X d)

0937Q

1.When cutting before sewing, the inside needle down position must be aligned accurately with the straight line section of the eyelet (when the cutting space H is 0).

This is set correctly at the time of shipment from the factory.

2.The shape of the eyelet is automatically changed according to the shape of the knife for cutting before and after sewing and for no cutting.

 

Cutting shape

Eyelet shape (c X d)

Knife No.

(a X b)

Cutting before sewing

Cutting after sewing

 

 

or off (no cutting)

 

1

2.1 X 3.2

1.9 X 2.8

2.4 X 3.9

2

2.8 X 4.3

2.4 X 3.9

3.3 X 4.6

3

3.0 X 4.6

3.2 X 4.1

3.6 X 4.8

4

3.2 X 5.4

2.8 X 4.7

3.6 X 6.1

5

Straight

Straight

Straight

6

3.8 X 4.3

3.2 X 3.6

4.0 X 4.5

3.At the time of shipment, the installation position for the knife is adjusted to the position shown in the illustration at left (when the cutting space H and the knife position compensation value I are "0").

(When cutting before sewing) (When cutting after sewing)

Explanation of the cutting space function

When cutting after sewing, this function moves the outer needle down positions in accordance with the knife shape so that the seam is not cut by the knife.

0938Q

Cutting space

1.When cutting after sewing, set the cutting space H to an appropriate value so that the seam is not cut by the knife.

*The cutting space H should generally be set to around 0.2 - 0.3. (Refer to page 24 for details on the setting method.)

*The knife position compensation value I should be set to "0".

Refer to "H. Setting the cutting space" and "I. Setting the knife position compensation".

RH-9800

33

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Contents DH4-B980 RH-9800 Safety indications and their meanings Safety InstructionsEnvironmental requirements InstallationCleaning Maintenance and inspectionSewing Needle bar guard Contents Names of Each Part Specifications SpecificationsTable processing diagram InstallationInstalling the machine head Installing the motorInstalling the oil container Raising the machine headLowering the machine head Tightening the V-belt Installing the spool standInstalling the control box Installing the air unit and the valve assemblyConnecting the knife valve cables Connecting the ground wires and the wirings Connecting the air tubes To decrease the air pressure Installing the air hosesAdjusting the air pressure To increase the air pressureConnecting the power cord Filling the arm oil tank LubricationAdding oil Lubrication1116Q 0862Q 1117Q Initializing settings Correct USEChanging the lower thread and gimp trimming Checking the direction of machine operation Threading the upper thread Installing the needleFor upper thread trimming specifications For upper and lower thread trimming specifications -01,-02Threading the lower thread Threading the gimp Setting the materialPanel button and switch names Operation panel part namesFront panel part name Changing the mode Selecting a program numberChanging the cutting timing Setting a program Setting the buttonhole length Setting the shape of the eyeletSetting the offset Setting the tacking lengthSetting the knife position compensation Setting the cutting spaceP1. Setting X correction P2. Setting Y correctionP3. Setting θ 1 correction P4. Setting θ 2 correction OFF Using the memory switchOn Low speed List of error codes Sewing Using the Emergency Stop switchAutomatic mode Manual mode or in automatic mode1164Q 1165Q Upper thread tension Adjusting the thread tensionTension adjustment Stroke adjustmentNeedle and knife position Explanation of the cutting space functionRelationship between knife position and eyelet shape Knife position compensation function Counting down to zero method Using the production counterResetting the production counter Displaying the production counterProgramming procedure Using a cycle programSetting the feed bracket to the front position Using feed mode Using manual mode Changing the cycle program counter Setting the number of home position cyclesReturning to the home position Draining the oil Cleaning and MaintenanceLooper height Standard AdjustmentsAdjusting the height of the spreader and looper Spreader 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 in the cutting block operation time Filing the cutting surface of the cutting block Replacing the knife Adjusting the cutting pressureMeasuring the opening amount Adjusting the cloth opening amountAdjusting the trimming of the lower thread and gimp Adjusting the trimming of the upper threadAdjusting the gimp length after trimming Sub presser Lower thread presserFront panel DIP switches Summary of DIP SwitchesCircuit board DIP switches Needle breaks TroubleshootingProblem Cause Remedy Thread breaks Skipped stitches occurLower thread is not cut ProblemCleanly Remedy Upper thread is not cut15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone

DH4-B980 specifications

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In summary, the Brother DH4-B980 combines speed, versatility, and advanced technology in a single sewing and embroidery machine. Its user-friendly features and innovative capabilities make it an excellent choice for anyone looking to elevate their sewing experience.
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