National Institute Of Fashion Technology, Gandhinagar Ergonomics Workplace Engineering Practical Ergonomic considerations in Over Lock Machine. PRESENTED BY:- Sapna Devi(18) M.F.TECH3rdSem Batch-(2011-13) 9-Dec-12 1
Overlock Machine Sewing StationDesignIn sewing station area we have to take care of three things such as Chair Table Treadle/Pedal
Risk Factors at sewing workstation awkward arm neck trunk and leg postures. These postures are influenced by the size of the worker and the design of the workstation. Possible solutions
Adjustable chair easily adjustable height, seat tilt, and backrest position; no wheels, or wheels that lock; a gently sloped or "waterfall" front edge to help prevent the chairs edge from pressing into the back of the legs; and a cushioned/contoured seat, which distributes the workers weight so no body part Padded chair with gets all the pressure. rounded, waterfall edge. Narrow back rest is ideal for twisting jobs.
•There should be 2-3 inches between the back ofyour leg and the seat of the chair.•Seat height should be at knee level whenstanding
The back of the knee should be slightly higher than the seat of the chair The seat may be slightly lower when the worker uses a treadle or pedal. Proper chair height. 16 inches off the floor (according to the worker height it may be 18 inch)
Incorrect CorrectTable too high, causing workers Height-adjustable table.left elbow to be raised. The average adult needs a table with a surface thats about 28 inches off the floor
Elbow height is shown by the horizontal broken line. The needleposition is shown by the vertical broken line.
Table edges should be padded or rounded.Employee leaning on sharpedges. Tables should be at elbow height.
The table top should not press on the workers thighs. Workers who use a treadle need more room than those who dont so they can move their legs more easily.
Reaching overhead to pick up Lowering the clothingfabric can cause stress on the rack can minimizearms, neck, and shoulders. overhead reach.
Reaching to the side to place Minimize reach by placingfabric. material closer to the worker.
Reach in three planes Work pieces, tools and controls that are in regular use should be located directly in front of or near the body. The reach envelopes in three planes. The most important operations should take place within a radius of approximately 80 cm.)
Incorrect correctPoorly-designed treadle Treadle that eliminates awkwardcauses the worker to use leg posture and requires minimalawkward posture. force to operate, especially while standing.
A Footrest for supporting left footTreadle too close Place treadle so employee can get close to table
Height of the Hands and Focal Point,for Carrying Out Various Tasks While Seated orStanding Types of task Work Height Use of eyes: frequent infrequent 10-30 cm below Use of hands/arms: eye height Use of eyes: frequent frequent 0–15 cm above Use of hands/arms: elbow height Use of eyes: infrequent frequent 0–30 cm below Use of hands/arms: elbow height
Ergonomics distance by taking theactual Body Measurements Operator Shoulder to Needle Distance – 19 inch Operator shoulder to wheel – 23 inch Operator shoulder to switches – 19 inch Operator shoulder to tensioner – 16 inch Operator to Wheel – 12 inch Eye to needle – 16.5 Operator to table – 12 inch Height of machine – 10.5 Length of the table – 42 inch Width of the table – 21.2 inch Height of the table – 28 inch Dimensions of the plate– 8.5x4.7 inch Height of the plate – 3.7 inch
Distance b/w pedal and lifter - Diameter of wheel – 2.24.5 inch(it should be close to each inch(because the grip of theother because opening of legs is hand is about 2.2 inch so it isabout 5 inch when stitching as easily movable.per comfortable
Lifter Size Mannual pressure foot lifter – Length(1 inch) - Width (0.2 inch) Because the thumb size is about 1.2 inch so the liftersize should be according to the thumb. so we can use lifteasilyOperator to table distanceIt should be approx.12 inch. It is best for easily movements of the operator for picking, delivery etc.
The machine distance Machine distance fromfrom the left side -18 inch the right side is 6.5 inch(For proper handling of for maintaining the proper distance from thethe fabric, also the place spoolsfor delivery we can use)
Electrically height adjustable The ideal, ergonomic sit - down/stand-up workstation Table tops standard - 1,500 x 800 x 30 mm (approx.59 x 31.5 x 1.2 in.) 4 Utility shelf tiltable - 300 mm deep (approx. 12 in.) 5 Monitor tray with swing arm - 300 x 300 mm (approx. 12 x 12 in. Tool balancer load - 0.6 - 2.0 kg (approx. 1.3 - 4.4 lbs.) Footrest height adjustable, tiltable
Overlock machine ergonomicsMTC System mtc(micro thread control) system permitting precise adjustment of the over-edge thread length at the simple turn of the control dial.
Automatic safety switch When the looper cover or free-arm cover is opened, a safety switch is automatically activated that prevents accidental operation of the serger. It offers greater safety during thread changes and threading up
The LCD screen LCD screen permanently displays all important stitch parameters. LCD display helps to set the right thread tension and individually set values can even be stored in the BERNINA 1300 MDC’s memory. Settings will then still be available, even if we switch to another stitch from time to time.
Handwheel position indicator During a thread change, we’ll be able to tell at a glance when the needles and lower looper are in the ideal position for threading.
Adjustable thread tension Thread tension is adjusted via slide controls which not only afford you immediate access to the thread tension but also show you at a glance the current thread tension for each thread.
Automatic cutting Computer sensing, automatic cutting lines, cutting belt. The button type manual cuts the line electro-magnet type) to cut the line automatically around the dust collector (air operated). Not returned to the ring or hand-cut needs to be done, can improve ergonomics at least 30%.
New oiling & lubrication device Automatically oiling system with filter pump
Swing-out upper-knife arm formore space When we don’t wish to trim the fabric edge or when you’re working in coverstitch mode, this gives you an additional advantage in terms of sewing ease, providing you with more space to give rein to your creativity.
Ergonomic Pedal The speed, foot-lift and thread clipping have been separated into two pressure sensors Equal pressure on both legs while standing. (500 mm x 500 mm = approx. 20 in. x 20 in.) Sewing speed parameter input and activation of foot-lift and thread clipping can now be done by a gentle weight shift onto the sensor elements. This efficiently prevents poor body posture and health problems.