In daily life we often see doctors with stethoscopes to check patients, railway workers with a hammer to tap the tracks to determine whether there is a fault, in fact, in the process of repairing sewing machines, experienced technicians sometimes listen to the sound , which can roughly determine the location where the fault may occur, so as to "cure the disease", improve the efficiency of machine repair.
Experienced servicers say the following sounds are often encountered during repairs.
★Collision sound :
This sound usually occurs in the mating part of the feed dog and the needle plate, where the needle rod intersects the press foot, or when the pick rod intersects the face plate, as shown by the fact that when the last wheel turns for a week, it makes one or two collisions like a hammer hitting the metal.
This problem is common in the rack rocker ball combination, here the friction sound, refers to the part with the surface of the poor finish, or two parts fit too tight, or due to lack of oil, between the two parts can not be properly lubricated and issued a "squeak, squeak" dry grinding sound.
★Loose sound :
Most of this sound is caused by the lack of lubricant in the sewing machine, its sound is more messy without any regularity, sounding like the sewing machine is about to loose. In addition, the sewing machine is in disrepair and makes this sound, if this is the case, it will not help to fill it with lubricants alone.
★Jitter sound :
This kind of sound is mostly caused by the unsteady operation of the sewing machine. It is usually expressed as a louder sound and the sound size changes with the speed of the speed. When in use, the machine head and the table, the frame and the ground will also be obviously jitter or bounce.
★Dull sound :
Most of this failure is caused by blind adjustment screws, because each part has a certain standard of cooperation, if a part is tightened, then the parts associated with it will be more laborious to run, so it will make a "twisted" dull sound.
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