Study on lock stitch button hole sewing machine

Introduction: 

A lock stitch buttonhole home sewing machine is employed to form a hole of the button of clothes. Varies sorts of buttonhole create or make by lock stitch buttonhole home appliance. Lock stitch home appliance is an automatic home appliance due to its knife automatic cut thread or yarn and makes a hole within the fabric.

Machine specification: 

 Name: Lock stitch buttonhole home appliance 

 Brand name: YAMAHA

 Model: FY 781

 Origin: China

 Function: to form and stitch buttonhole.

Machine Parts Name:

1) Thread stand: to carry the thread package.

2) Eye thread guide: To support the thread.

3) Two tension post: to supply proper tension on the thread.

4) Needle thread take-up lever: to carry the needle thread and help to maneuver easily.

5) Knife lever: to modify on the knife.

6) Upper scissor: to chop the material.

7) Needle clamp: to carry the needle with the needle bar.

8) Presser foot: To press the material and provides uniform pressure.

9) Feed dogs: to maneuver the material forward

10) Throat plate: to assist the material move forward.

11) Handwheel: To slowly raise the needle by hand.

12) Rotary hook: to make the hook.

13) Feed adjusting lever: to regulate the feed of the fabric.

14) Emergency stop lever: to prevent the machine emergency.

15) Safety glass: to guard the attention.

16) Foot pedal: to regulate the machine speed.

 Other information:

 Motor Rpm =1440

 Voltage =220 V

 Power =550 Watt

 HP = 1HP

Fig: Thread path of  lock stitch buttonhole sewing machine

Working procedure:

1) Firstly we kept the thread package on the thread stand.

2) Then we passed the thread consistent with their passing path.

3) We also maintain the thread tension with the assistance of the tension post.

4) Thread undergo the needle and found out the machine properly.

5) then turn on the machine.

6) Finally, we did the buttonhole on the sample fabric with the assistance of a lock stitch buttonhole home appliance.

Precaution:

1) we should always not press any elements or switch without the permission of the teacher or lab assistant.

2) we should always maintain proper speed by pressing the pedal correctly.

3) we should always keep the distance from our hand and finger from the needle during work with home appliance operation.