CN2819637Y

CN2819637Y - Paper cutter

Info

Publication number: CN2819637Y
Application number: CN 200520027379
Authority: CN
Inventors: 林中选
Original assignee: 林中选
Current assignee: Shenzhen Ostar Electronic Co., Ltd.
Priority date: 2005-09-15
Filing date: 2005-09-15
Publication date: 2006-09-20
Anticipated expiration: 2015-09-15

Abstract

The utility model discloses a small paper cutter which is mainly composed of a driving motor and a rectification bridge, wherein an armature winding and an exciting winding of the driving motor are connected with the output end of the rectification bridge after the armature winding and the exciting winding are connected in parallel, and the input end of the rectification bridge is connected with an alternating current power supply. Therefore, the speed difference of the zero load and the load of the small paper cutter is changed so that the noise of the zero-load running of the small paper cutter is reduced.

Description

Shredder

Technical field

The utility model belongs to small-sized shredded paper machinery, particularly relates to the small-sized shredder that a kind of drive motor and rectifier bridge are formed.

Background technology

If known small-sized shredder mainly is made up of drive motor, movement, circuit, various switch, indicator light and casing at present, wherein the armature winding of drive motor and field winding are to be connected in series, back external AC.Power-line plug is inserted in the supply socket, switch is allocated to automated location from the shutdown position, machine promptly is in the stand-by operation state.Paper is put into paper feed port, the automatic shredded paper of machine, when shredded paper finishes, the machine automatic time delay shuts down, this moment the set noise maximum.But office or family are the places that need keep quite, and general small-sized shredder is because noise causes worry to the user greatly.Producing the big main cause of noise is that drive motor adopts A.C. series motor, its mechanical property is that the pass of torque and rotating speed is: it is required rotating speed that full load reaches rated speed, rotating speed rises when unloaded, exceeds much than rated speed, that is to say this moment when the machine time-delay stops.Because rotating speed is too high, make the wind of the vibration of friction, motor of the brush of motor and commutator and fan all excessive, thereby make the noise of motor excessive, and empathize with the casing of machine, make whole shredder noise excessive.

Summary of the invention

Plant the big deficiency of noise in operating in order to overcome existing small-sized shredder sky, the utility model provides a kind of small-sized shredder that can reduce noise.

The technical scheme that the utility model is taked for the technical problem that solves the known technology existence is to link to each other the input termination AC power of rectifier bridge with rectification bridge output end after drive motors armature winding in the small-sized shredder and field winding are connected in parallel.

Advantage and the good effect that the utlity model has are: owing to take drive motors armature winding and field winding in the small-sized shredder to be connected in parallel and by rectifier bridge alternating current to be transformed for direct current, change the speed discrepancy of the zero load and the load of drive motors in the small-sized shredder, greatly reduced noise when making the no-load running of small-sized shredder.

Below in conjunction with accompanying drawing and concrete execution mode the utility model is described in further detail:

Description of drawings

Fig. 1 is a direct current shunt motor mechanical characteristic;

Fig. 2 is the A.C. series motor mechanical characteristic;

Fig. 3 is a direct current shunt motor winding diagram.

1. brush, 2 armature winding, 3. field winding, 4. rectifier bridge, 5. delay switch, 6. starting switch, 7. AC power.

Embodiment

The mechanical characteristic of direct current shunt motor in the small-sized shredder shown in Figure 1, its no-load speed is N _{0 also}, torque at rated load M _{H also}The time rotating speed be N _{H also}, the speed discrepancy when zero load and nominal load is N _{0 also}-N _{H also}The mechanical characteristic of A.C. series motor shown in Figure 2, its corresponding symbol is N _{0 string}, M _{The H string}, N _{The H string}And N _{0 string}-N _{The H string}By Fig. 1 and Fig. 2 as seen, two kinds of motor when identical nominal torque and rated speed, its N _{0 also}-N _{H also}＜N _{0 string}-N _{The H string}The no-load speed of this explanation direct current shunt motor is lower than the no-load speed of A.C. series motor, thereby has reduced the noise of shredder.

As shown in Figure 3, the power supply of direct current shunt motor is the direct current that alternating current 7 rectifications is changed into by rectifier bridge 4, and field winding 3 directly is connected on the rectifier bridge 4, and armature winding 2 process commutators and brush 1 are also directly on rectifier bridge 4.After plug inserts AC power 7, starting switch 6 is toggled it to automated location by the shutdown position, machine promptly is in holding state.Paper is put into paper feed port, and the thrust of paper is stirred delay switch 5, and delay switch 5 closures are connected circuit, the machine shredded paper.Shredded paper finishes, delay switch 5 Time Delay Openings, and machine is in holding state again, is allocated to the shutdown position up to starting switch 6, and this moment, small-sized shredder cut off the power supply fully, and quit work.

Claims

1, a kind of small-sized shredder mainly is made up of drive motors and rectifier bridge, it is characterized in that: described drive motors armature winding is connected in parallel with field winding and then links to each other the input termination AC power of rectifier bridge with rectification bridge output end.