CN100572226C - Paper extraction unit - Google Patents

Abstract

The invention provides a kind of paper extraction unit that can be applicable in the feeding system.This paper extraction unit comprises that an axle drive shaft, gets a paper arm and a spring clutch.Spring clutch comprises a spring and an axle sleeve, and wherein, but axle sleeve extends the claw of a deformation, and this claw comprises the calvus of a plurality of these drive shaft surface of encirclement, and has a gap between each this calvus and the calvus adjacent with this calvus; One end of spring then entangles the periphery of claw.

Description

Paper extraction unit

Technical field

The present invention relates to a kind of paper extraction unit, particularly a kind of paper extraction unit with single spring clutch.

Background technology

In office work machines such as scanner, facsimile apparatus, duplicator or tabulating machine, often dispose the file in regular turn feed-in of a feeding system with storehouse after, finish actions such as follow-up scanning, fax, photomechanical printing or printing again.Wherein, often be provided with a paper extraction unit that can contact in the feeding system in order to feed-in file one by one with the top document leading edge.

See also Figure 1A, 1B, it is the position view of the paper extraction unit in the known feeding system.The shown paper extraction unit of Figure 1A is in the paper feed state, and the shown paper extraction unit of Figure 1B then is to be in the readiness that does not carry out the paper feed action.The following action that paper extraction unit is described with reference to Figure 1A and Figure 1B.

At first with reference to Figure 1A, when feeding system 1 carried out the paper feed action, an axle drive shaft 21 of paper extraction unit 2 rotated and one of paper extraction unit 2 is got paper arm 22 fall to a paper feed position along a direction R1 via the drive of motor.At this moment, get paper arm 22 and just pass through a pickup roller 221, and make only have a file to be transmitted at every turn by a comber 222 with file S feed-in.

Then refer to Figure 1B, when after the paper feed release, motor makes axle drive shaft 21 rotate and the paper arm 22 of getting of paper extraction unit 2 is raised to a ready position along other direction R2.

There is following problem in above-mentioned known feeding system.Be exactly, paper extraction unit 22 in the feeding system 1 is installed in the below of a loam cake 3 mostly, under the situation of reality, when this axle drive shaft 21 rotates along the R2 direction and after will getting paper arm 22 and being raised to ready position, usually motor can not stop to drive this axle drive shaft 21 immediately, that is to say, though arrived normal ready position getting paper arm 22, but because motor continues to drive the cause of this axle drive shaft 21, and make that get paper arm 22 continues up lifting thereby strike loam cake 3 and make a noise, even loam cake 3 can be raised.

For solving the aforementioned problem that paper arm 22 bump loam cakes 3 produce noise, the known paper extraction unit that has a kind of head it off got.Please refer to Fig. 1 C, it is a kind of block diagram of the known paper extraction unit 2 that overcomes the above problems.The known paper extraction unit 2 of Fig. 1 C is got paper arm 22 in order to solution and is continued bump loam cakes 3 or the method that loam cake 3 such as raises at problem is the power-transfer clutch 23 that installing is made up of two unidirectional spring power-transfer clutchs 23A, 23B on axle drive shaft 21.Its operating principle is as follows: when feeding system 1 carries out paper feed, will get paper arm 22 by a spring clutch 23A earlier and fall; And when feeding system stops the paper feed action, still can will get the paper arm by the effect of spring clutch 23A and be raised to ready position.Afterwards, when getting that paper arm 22 continues to be lifted and when touching loam cake 3, paper extraction unit 2 just can allow axle drive shaft 21 dally by the effect of spring clutch 23B, thereby avoid getting paper arm 22 and continue bump loam cakes 3 or the situation that loam cake 3 starts is taken place.For example US Patent just discloses the paper extraction unit that this kind has two free-wheel clutchs No. 6390463.

Though installing the practice of two unidirectional spring power-transfer clutchs on axle drive shaft, known paper extraction unit can avoid getting paper arm lasting bump loam cake or the situation generation that loam cake is started, but, therefore increased the complexity of the cost and the paper extraction unit of paper extraction unit owing to need free-wheel clutch of additive incrementation.

Summary of the invention

The object of the invention is to provide a kind of paper extraction unit, reduces the cost of paper extraction unit and simplifies the structure of paper extraction unit by the single spring clutch that uses improvement.

The invention provides a kind of paper extraction unit, comprising:

One axle drive shaft;

One gets the paper arm, is articulated on this axle drive shaft;

One axle sleeve is sheathed on this axle drive shaft, and rotates synchronously with this axle drive shaft, and an end of this axle sleeve extends a claw, and this claw comprises the calvus of a plurality of these drive shaft surface of encirclement, and has a gap between each this calvus and the calvus adjacent with this calvus; And

One spring is located on this axle drive shaft, and an end of this spring is fixed in the periphery that this other end of getting this spring on the paper arm then is enclosed within this claw.

Preferably, this claw comprises the calvus of a plurality of these drive shaft surface of encirclement, and has a gap between each this calvus and the calvus adjacent with this calvus.

Preferably, form a gap between the surface of each this calvus and this axle drive shaft.

Preferably, this is got the paper arm and comprises a pickup roller and a comber.

Description of drawings

This case can obtain a more deep understanding by following graphic and explanation:

Figure 1A is the scheme drawing of the paper extraction unit of known feeding system in the paper feed position;

Figure 1B is the scheme drawing of the paper extraction unit of known feeding system at the ready position state;

The block diagram of Fig. 1 C known paper extraction unit;

Fig. 2 A is a preferred embodiment block diagram of paper extraction unit of the present invention;

Fig. 2 B is the exploded drawings of the paper extraction unit of Fig. 2 A;

The generalized section of the spring clutch when Fig. 3 A is positioned at the paper feed state for paper extraction unit of the present invention;

The generalized section of the spring clutch when Fig. 3 B returns back to ready position for paper extraction unit of the present invention; And

The generalized section of the spring clutch when Fig. 3 C touches loam cake for paper extraction unit of the present invention.

Wherein, description of reference numerals is as follows:

Feeding system 1 paper extraction unit 2

Axle drive shaft 21 direction R1

Get paper arm 22 pickup rollers 221

File S comber 222

Loam cake 3 direction R2

Power-transfer clutch 23 spring clutch 23A

Spring clutch 23B paper extraction unit 4

Axle drive shaft 41 is got paper arm 42

Pickup roller 421 spring clutchs 43

Axle sleeve 431 springs 432

Axle sleeve 44 linear groove 431A

Radius stay 433 claw 431B

Calvus 431B1 gap 431B2

Comber 422 gaps 45

The specific embodiment

Fig. 2 A is for showing the block diagram of the paper extraction unit that one embodiment of the invention provided, and Fig. 2 B then shows the three-dimensional exploded view of this paper extraction unit.

With reference to figure 2A and Fig. 2 B, paper extraction unit 4 of the present invention includes an axle drive shaft 41, and gets a paper arm 42 and a spring clutch 43 simultaneously.Wherein, getting paper arm 42 includes a pickup roller 421 and a comber 422 and is articulated on the axle drive shaft 41; After the motor (not shown) that axle drive shaft 41 then can be subjected to a feeding system drives, will get paper arm 42 and drop to the paper feed position or will get paper arm 42 and be raised to ready position.

With reference to Fig. 2 B, the spring clutch 43 that present embodiment provided includes an axle sleeve 431 and a spring 432.Wherein, axle sleeve 431 is set on the axle drive shaft 41.In addition, an end of axle sleeve 431 is provided with a linear groove 431A, by making a positioning rod 433 pass axle drive shaft 41 and being sticked in mode in the linear groove 431A, makes axle sleeve 431 be fixed on the axle drive shaft 41 and can rotate synchronously with axle drive shaft 41.

Continuation is with reference to Fig. 2 B, and in the spring clutch 43 that present embodiment provided, axle sleeve 431 extends a claw 431B from an end that combines with spring 432.Claw 431B comprises the calvus 431B1 of a plurality of encirclement axle drive shafts 41, wherein has a gap 431B2 between the calvus that each calvus 431B1 is adjacent.In addition, also there is a gap 45 (please also refer to) between each calvus 431B1 and the axle drive shaft 41 to the section-drawing shown in Fig. 3 A.Gap 431B2 and gap 45 are in order to allow claw 431B be produced the deformation of moving toward axle drive shaft 41 surfaces when being subjected to the pressure of spring 432.

Corresponding to Fig. 2 A and Fig. 2 B, in the spring clutch 43 that present embodiment provided, an end of spring 432 is to be set in an extension to ask on the axle sleeve 44 of paper arm 42, thereby makes this end of spring 432 be fixed on to get on the paper arm 42; The other end of spring 432 then is enclosed within the periphery of claw 431B.Because an end of spring 432 is fixed in and gets paper arm 42, according to the operating principle of unidirectional spring power-transfer clutch, spring 432 will present states such as lax or deflation because of the difference of the hand of rotation of axle drive shaft 41.

With reference to shown in Fig. 3 A to Fig. 3 C relevant for the section-drawing of spring clutch 43 to understand the operation principles of spring clutch 43.At first with reference to Fig. 3 A, when axle drive shaft 41 when direction R1 rotates, spring 432 presents a relaxed state, therefore allows axle drive shaft 41 freely rotate and will get paper arm 42 and drop to the paper feed position.Then with reference to Fig. 3 B, when the paper feed action stops, getting paper arm 42 must be lifted so that be returned to ready position, therefore make axle drive shaft 41 rotate and spring 432 is tightened and then claw 431B is clamped, and allow axle drive shaft 41 be able to be raised to ready position getting paper arm 42 by the friction force between spring 432 and the pawl 431B of portion along other direction R2.At last with reference to Fig. 3 C, when axle drive shaft 41 continues to rotate and allow when getting paper arm 42 and touching the loam cake of feeding system along direction R2, loam cake is bestowed and is got paper arm 42 pressure and will force spring 432 to tighten more, thereby causes a plurality of calvus 431B1 of claw 431B to produce deformation and reduce the area of contact of claw 431B and spring 432.Because spring 432 diminishes with the area of contact of claw 431B, therefore the friction force between spring 432 and the claw 431B also decreases, the compressing power that making axle sleeve 431 is overcome, spring 432 tightens and produce idle running with axle drive shaft 41, thereby avoid getting paper arm 42 and continue the bump loam cakes or get paper arm 42 situation that loam cake starts is taken place.

Above-described embodiment only is explanation technological thought of the present invention and characteristics; its purpose makes those skilled in the art scholar can understand content of the present invention and is implementing according to this; and can not limit the scope that the present patent application is protected with this; and the equalization done of with good grounds disclosed spirit change or modify, must be encompassed in the scope of the present patent application protection.

Claims (3)

1. paper extraction unit comprises:

One axle drive shaft;

One gets the paper arm, is articulated on this axle drive shaft;

One axle sleeve is sheathed on this axle drive shaft, and rotates synchronously with this axle drive shaft, and an end of this axle sleeve extends a claw, and this claw comprises the calvus of a plurality of these drive shaft surface of encirclement, and has a gap between each this calvus and the calvus adjacent with this calvus; And

One spring is located on this axle drive shaft, and an end of this spring is fixed in the periphery that this other end of getting this spring on the paper arm then is enclosed within this claw.

2. paper extraction unit as claimed in claim 1 wherein, forms a gap between the surface of each this calvus and this axle drive shaft.

3. paper extraction unit as claimed in claim 1, wherein this is got the paper arm and comprises a pickup roller and a comber.

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