CN2722528Y - Scanning paper pressing device - Google Patents
Scanning paper pressing device Download PDFInfo
- Publication number
- CN2722528Y CN2722528Y CN 200420072371 CN200420072371U CN2722528Y CN 2722528 Y CN2722528 Y CN 2722528Y CN 200420072371 CN200420072371 CN 200420072371 CN 200420072371 U CN200420072371 U CN 200420072371U CN 2722528 Y CN2722528 Y CN 2722528Y
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- CN
- China
- Prior art keywords
- support ring
- rotating shaft
- paper
- air roll
- pressing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a scanning paper pressing device used in a scanner, a fax machine and other image documentation equipments. To solve the problem of paper jam in the course of fast paper feeding or somewhat soft paper in the existing similar devices, the utility model adopts the roller paper pressure mechanism and comprises rotation shafts and the air rolls sleeved on the rotation shafts. The support rings are sheathed on the rotation shafts of the both ends of the air rolls, and the cylinders which can make the rotation shafts rotate in the support rings are sheathed on the rotation shafts on the both ends of the support ring. The driving medium which is used to drive the rotation shaft is provided with one end of the rotation shaft. Each cylinder is provided with a spring, and the elastic force of the springs makes the support rings hang to the glass surface of the image sensor. The outer diameter of the air roll is a little smaller than the outer diameter of the support ring, so that a tiny interstice is formed between the air roll and the glass surface of the image sensor. The utility model can not only make the paper that are scanned hang to the glass surface of the image sensor through the air roll, but also assure the smooth of the paper feeding through the air roll.
Description
Technical field
The utility model relates to image documentation equipments such as scanner, facsimile machine, more particularly, relates to a kind of scanning paper pressing device that is used for image documentation equipments such as scanner, facsimile machine.
Background technology
In equipment such as scanner, facsimile machine, imaging system is one of the most key parts.At present; most imaging systems all adopt contact-type image sensor (CIS); the reflecting surface of this type of imageing sensor is positioned at the outer surface of cover glass; this just requires, and contribution must be close on the cover glass face of imageing sensor when scanning; so that the light that light source sends is subjected to the reflection on contribution surface at the reflecting surface place, thereby make reverberation enter into sensor devices to finish the transformation of light signal to the signal of telecommunication.In this kind equipment, how making contribution be close on the surface of imageing sensor is a very important problem.Particularly for paper feeding scanner at a high speed, because the paper feeding speed of its feed-in paper requires contribution can also be close to the glass surface of imageing sensor under the situation of high speed paper feed than higher.
Existing paper feeding scanner and facsimile machine all adopt mode paper feed shown in Figure 1.Shown in the direction of arrow among Fig. 1, during paper feed, paper 14 is subjected to the promotion of outside paper feed mechanism (not drawing in the drawings), walk cardboard 13 is fed through between platen bar and the imageing sensor through the right side, platen bar 11 is pressed on paper 14 on the glass of imageing sensor 1 by spring 12, to guarantee the scanning effect; Owing to without any drive unit, then send so every a piece of paper need could enter between platen bar and the imageing sensor and from a left side under the conveying of prime paper feeding running roller (not drawing among the figure) fully in the bottom of imageing sensor.In this paper feed scheme, because of the bottom of imageing sensor does not have drive unit, so when high speed paper feed or paper are softer, be easy to take place the paperboard problem.
The utility model content
At the above-mentioned defective of prior art, the utility model will solve the problem that paperboard takes place between the glass of equipment such as conventional scanner, facsimile machine its imageing sensor when high speed paper feed or paper are softer and the paper-pressing mechanism easily.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of scanning paper pressing device, comprise contact-type image sensor and the paper-pressing mechanism that cooperates with it; Wherein, described paper-pressing mechanism is the roller type paper-pressing mechanism, comprises rotating shaft and air roll, and described platen rod is fixedly set in the rotating shaft; Respectively be set with a support ring in the rotating shaft at described air roll two ends, the spacing between described two support rings is less than the width of described imageing sensor; Respectively be set with a sleeve in the rotating shaft at described support ring two ends, described rotating shaft can be rotated in sleeve; End in described rotating shaft is equipped with the driving member that can drive its rotation; At each sleeve place a spring is housed also, described spring applies elastic force towards described imageing sensor to described paper-pressing mechanism, makes described support ring be close to the glass of described imageing sensor; The external diameter of described air roll is slightly less than the external diameter of support ring, thereby forms a minim gap between the glass of described air roll and imageing sensor.
In the utility model, can be between described support ring and the rotating shaft and be slidingly matched, this moment, the internal diameter of support ring should be slightly larger than the external diameter of described rotating shaft, and rotating shaft can be rotated in support ring; Can also be secure fit between described support ring and the rotating shaft, this moment, each support ring be fixedly set in the rotating shaft, but in the rotating shaft between support ring and the air roll isolation pad of suit also.
In the utility model, described driving member is travelling gear preferably; Described support ring is the plastic support ring preferably, and described air roll is the rubber air roll preferably.
From such scheme as can be seen, in the scanning paper pressing device of the present utility model, both can make it to be close to the active force that the paper that is scanned applies in the face of imageing sensor by air roll with the glass of imageing sensor, can apply the active force identical to the paper that is scanned by air roll again with page orientation, thereby realized the platen function simultaneously and guaranteed the function of smooth and easy paper feed, under situation such as high-velocity scanning or paper be relatively poor, also can guarantee the scanning focal length of imageing sensor, and guarantee normal chart drive speed paper.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the fit structure schematic diagram between imageing sensor and the paper-pressing mechanism in conventional scanner and the facsimile machine;
Fig. 2 is the stereogram of the roller type scanning paper pressing device in preferred embodiment of the utility model;
Fig. 3 is the cutaway view when the axis of Fig. 2 shaft is cut open;
Fig. 4 is the A portion enlarged diagram of Fig. 3;
Fig. 5 is the B-B cutaway view Amplified image of Fig. 3.
Embodiment
A preferred embodiment of the present utility model such as Fig. 2 are to shown in Figure 5.What wherein adopt is roller type paper-pressing mechanism shown in Figure 2.As can be seen from Figure 3, in the central authorities of rotating shaft 3 rubber air roll 7 is housed; Left end in rotating shaft 3 is equipped with travelling gear 2, sleeve 4, support ring 5 and isolation pad 6 successively, in the bottom of sleeve support spring 8 is housed also; Right-hand member in rotating shaft 3 is equipped with sleeve, support ring and support spring equally.Wherein, a sulfidization molding is structure as a whole between rubber air roll 7 and the rotating shaft 3, adopts rubber to make air roll, can guarantee that there is certain frictional force on its surface to paper, is easy to drive paper and moves.
For being slidingly matched, rotating shaft can freely be rotated in left and right sleeve between sleeve 4 and the rotating shaft 3.Between support ring 5 and the rotating shaft 3 two kinds of fit systems can be arranged: in first kind of fit system, support ring and rotating shaft are fixed together, and rotate with rotating shaft; In the second way, for being slidingly matched, rotating shaft can freely be rotated in left and right support ring between support ring and the rotating shaft.
From said structure as can be seen, rotating shaft 3 is to float to install with respect to the glass of imageing sensor, when specifically implementing, left and right sleeve 4 can be stuck in the casing groove of scanner or facsimile machine.Under the effect of left and right support spring 8, whole rotating shaft and with it the rubber air roll 7 of one can fluctuate, thereby make the outer round surface of left and right support ring 5 be close to the lower surface of imageing sensor 1.
As shown in Figure 4, in the present embodiment, the external diameter of rubber air roll 7 is than the little 0.5mm of external diameter of support ring 5, at this moment, the outer round surface of rubber air roll 7 not with the glass contact of the lower surface of imageing sensor 1, but the gap of a 0.25mm is arranged.
During the scanning paper feed, external driver device will drive rotating shaft 3 rotations by travelling gear 2, make rubber air roll 7 by the linear velocity rotation that adapts with paper feeding speed,, can not have frictional force between the two because whole rubber air roll does not contact with the glass of imageing sensor.When paper was sent into, the turning effort meeting of rubber air roll 7 applied active force to paper, thereby paper was brought in the slit between the glass of rubber air roll and imageing sensor; Because this slit is very little, makes the paper that enters to be close together with the glass of imageing sensor, thereby can guarantee the scanning focal length of paper.Because the turning effort of rubber air roll 7, even if under the softer situation of high speed paper feed or paper, also can realize paper simultaneously smooth and easy by and the platen effect.
In the utility model, support ring 5 can produce different effects with two kinds of connected modes between the rotating shaft 3.In first kind of mode, support ring rotates with rotating shaft, its outer round surface can contact and have relative motion with the glass of imageing sensor 1, there is friction to exist between the two, thereby can increase the transmission resistance of system, support ring can wear and tear and diminish after the long-term operation, thereby makes the platen gap diminish gradually until disappearance; And this wearing and tearing also may cause the glass fragmentation of imageing sensor.In the second way, support ring with no longer rotate after the glass of imageing sensor 1 contacts, do not have frictional force between the two, the rotary resistance of rotating shaft is little, it is constant that the platen gap can keep, so the second way is adopted in suggestion.
In accompanying drawing 3, in order to illustrate conveniently, support spring 8 has been drawn as the compression spring structure, in fact, what use in the present embodiment is spring steel wire, and steel wire diameter is 0.8mm, curve two limits of 90 °, wherein be fixed in vertical direction on the housing on one side, another side then is positioned at sleeve 4 belows in horizontal direction, and sleeve is held up.In addition, wherein support ring 5 adopts stepped ring forgings, can increase the length of fit between itself and the rotating shaft, makes transmission more steady, and support ring is preferably plastic parts, can not scratch the surface of transducer to guarantee it.
Claims (7)
1, a kind of scanning paper pressing device comprises contact-type image sensor (1) and the paper-pressing mechanism that cooperates with it; It is characterized in that,
Described paper-pressing mechanism is the roller type paper-pressing mechanism, comprises rotating shaft (3) and air roll (7), and described platen rod is fixedly set in the rotating shaft; Respectively be set with a support ring (5) in the rotating shaft at described air roll two ends, the spacing between described two support rings is less than the width of described imageing sensor; Respectively be set with a sleeve (4) in the rotating shaft at described support ring two ends, described rotating shaft can be rotated in sleeve; End in described rotating shaft is equipped with the driving member that can drive its rotation;
At each sleeve place a spring (8) is housed also, described spring applies elastic force towards described imageing sensor to described paper-pressing mechanism, makes described support ring be close to the glass of described imageing sensor; The external diameter of described air roll is slightly less than the external diameter of support ring, thereby forms a minim gap between the glass of described air roll and imageing sensor.
2, scanning paper pressing device according to claim 1 is characterized in that, the internal diameter of described support ring is slightly larger than the external diameter of described rotating shaft, and described rotating shaft can be rotated in described support ring.
3, scanning paper pressing device according to claim 1 is characterized in that, each support ring is fixedly set in the rotating shaft; In the rotating shaft between each support ring and the described air roll, respectively be set with an isolation pad (6).
4, scanning paper pressing device according to claim 3 is characterized in that, respectively is set with an isolation pad (6) in the rotating shaft between each support ring and the described air roll.
5, according to each described scanning paper pressing device among the claim 1-4, it is characterized in that, the external diameter of described air roll is littler 0.5 millimeter than the external diameter of support ring, thereby forms one 0.25 millimeter minim gap between the glass of described air roll and imageing sensor.
6, scanning paper pressing device according to claim 5 is characterized in that, described driving member is a travelling gear (2).
7, scanning paper pressing device according to claim 6 is characterized in that, described support ring is the plastic support ring, and described air roll is the rubber air roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420072371 CN2722528Y (en) | 2004-08-06 | 2004-08-06 | Scanning paper pressing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420072371 CN2722528Y (en) | 2004-08-06 | 2004-08-06 | Scanning paper pressing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2722528Y true CN2722528Y (en) | 2005-08-31 |
Family
ID=35012896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420072371 Expired - Fee Related CN2722528Y (en) | 2004-08-06 | 2004-08-06 | Scanning paper pressing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2722528Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011103758A1 (en) * | 2010-02-25 | 2011-09-01 | 珠海天威飞马打印耗材有限公司 | Paper pressing mechanism, photosensitive drum assembly and processing cartridge |
| CN101643155B (en) * | 2008-08-08 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Paper pressing device |
-
2004
- 2004-08-06 CN CN 200420072371 patent/CN2722528Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101643155B (en) * | 2008-08-08 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Paper pressing device |
| WO2011103758A1 (en) * | 2010-02-25 | 2011-09-01 | 珠海天威飞马打印耗材有限公司 | Paper pressing mechanism, photosensitive drum assembly and processing cartridge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |