Three kinds of motors are used in electric shavers. Some contain a tiny universal motor, others contain a vibrator type motor. Cordless razors contain NiCad cells, miniature DC motor, and charging components all within the shaver unit. A scraper or series of scrapers attached to the motor moves in reciprocating fashion—that is, in a back-and-forth, straight line way.
Reciprocating motion is established by means of a small pinion. Essentially, the pinion and scraper are connected by a stud set in an offset position in the pinion. Thus, the scraper is prevented from making a full-circle turn as the motor revolves; its travel is limited to the size of the razor head.
There are variations in the way different makes of electric razors are built, but the principle just described applies to all, with the exception of those that employ rotary heads.
Electric razors generally use very thin perforated shields to enclose the whiskers as skin is pressed against the shields. The rapidly moving scraper shears off the hairs extending through the surface of the shield.
The power source to operate an electric shaver's motor may come from a wall outlet by means of a line cord or through a tiny nickel-cadmium battery in cordless electric razors. Batteries of cordless electric razors have to be recharged periodically by being connected to a wall outlet through use of a line cord.
PROBLEMS, CAUSES, REPAIRS
The electric razor is one appliance that owners—even those with technical ability--cannot repair. Replacement parts are not usually available, not even to professional appliance technicians. The shaver must be returned to the factory when a problem occurs.
The key word to keep in mind regarding caring for your electric razor is "clean." The razor should be brushed clean of hair after every use to maintain its effectiveness and extend its life.
How many types of motors are generally used in the shaver?
A.Two.
B.Three.
C.Four.
D.Not known.
第1题
感官检查不合格的产品,是否需要进行理化检查
A、进行
B、不进行,直接判为不合格产品
C、可以进行,也可以不进行
D、必须进行理化检查
E、换样品后,重新检查
第2题
感官检查不合格的食品,是否需要进行理化检查
A、进行
B、不进行,直接判为不合格产品
C、可以进行,也可以不进行
D、必须进行理化检查
E、换样品后,重新检查
第3题
通过感官检查,确定为不合格产品
A、还需进行理化检验后,才能判为不合格产品
B、不需进行理化检验,可直接判为不合格产品
C、还需进行理化检验,才能判定是否为不合格产品
D、不需进行理化检验,可由检测负责人判定是否为不合格产品
E、是否需进行理化检验,由检测负责人判定
第4题
感官不合格产品,需进行理化检验吗
A、进行
B、可以进行,也可以不进行
C、以上都可以
D、不进行,直接判为不合格产品
E、必须进行检验
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