BUTTONHOLE MACHINES

DEFINITION

• Buttonholes are holes in the fabric that are paired with functional buttons that serve as fasteners and as decorative buttons. The machine used for constructing buttonholes is known as buttonhole machine

• Buttonhole can be done in two ways• Simple button holes are used in shirts, blouses• Complex button holes are used in tailored

garments such as jacket, overcoats

VARIABLES IN BH MACHINES

• Form and size of the buttonholes• The stitch type• The stitch bight• Stitch density• Cut setting of button hole• Presence and absence of gimp thread

SHAPE OF BUTTONHOLE STITCHES

• Circle• Eyelet• Square• Radial• Square radial

PRINCIPLE OF STITCH FORMATION

STITCH

CHAIN LOCK

COMPUTERIZED MACHINES

• Required pattern can be selected• According to width the knife can be used• They show error codes• Operating panelSelection of patternEditing the chosen patternStitch densityBar tacking length

Conti….

Eyelet shape length Basting pitch Knife motion Speed Thread tension

SETTINGS OF MACHINES

• Height of the needle bar• Needle to hook timing• The position of needle and needle guard• Adjusting the feed motor to have uniform feed• Adjusting the stroke of cloth cutting knife• Adjusting presser foot lift, pedal, and take up

spring tension• Adjusting the thread breakage plate and all the

sensors

STITCHING STYLES

STITCHING STYLE

BASTING JOINING

• CONTINUOUS BH MACHINEPre programming can be done• Specification considered in button holes areDifferent stitches Sewing speedSewing sizeOver casting widthMaximum stitch lengthNeedle bar strokeMaximum presser foot liftAutomation lubrication

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