CN1022823C

CN1022823C - Sheet feeding device

Info

Publication number: CN1022823C
Application number: CN90107205A
Authority: CN
Inventors: 冈田启美; 大正雄
Original assignee: Mita Industrial Co Ltd
Current assignee: Kyocera Mita Industrial Co Ltd
Priority date: 1989-08-28
Filing date: 1990-08-25
Publication date: 1993-11-24
Anticipated expiration: 2005-08-25
Also published as: KR910004366A; GB2235438B; JPH03172247A; GB2235438A; CN1059210A; GB9018551D0; KR960002761Y1

Abstract

When a sheet feeding cassette is mounted on an image forming apparatus or the like, a forward portion of a mounting plate is urged upward so that an upper surface of the forward portion of the mounting plate is brought into contact with a feed roller. A pair of non-slip pads is affixed to the upper surface of the forward portion of the mounting plate. The non-slip pads are members each having a plane shape of approximately L or its reversed shape and made of, for example, a rubber plate. The non-slip pads are affixed to such a position that they do not come into direct contact with the feed roller. Consequently, when sheets are fed, the last sheet is not directly nipped strongly by the feed roller and the non-slip pads, to produce no buzzing noise. In addition, the non-slip pads are in the vicinity of the feed roller. Accordingly, the non-slip pads perform the function of preventing the last sheet from being fed together with the other sheets if the number of the sheets is reduced, that is, preventing the sheets from being fed together.

Description

Sheet feeding device

The present invention relates to a kind of improved sheet feeding device that is contained on image formation or the similar devices.

For example, an image forming apparatus, as, duplicator or chopping machine need the page (transfer paper, photosensitive paper, heat sensitive paper or similar paper) that forms image thereon, and known a kind of device of sending page to is to send box to from the page that this equipment body takes off.

Page is sent in the box can be equipped with many pages, box-packed on image device the time when page is sent to, once sends into a piece of paper by a push rolls that is contained on the equipment body.In order to send page to, must make push rolls push down the page front end and on page, apply a feed pressure with push rolls.If applied a feed pressure, between push rolls and page, produce a friction force, in this state, push rolls is rotated and send into page.

So in order to apply a feed pressure on page, page is sent box to and had an arrangement plate 1 usually, as shown in Figure 1, it can be the upper and lower motion in center with its rear end that the connection of arrangement plate 1 should make its front end, and is upwards promoted by a spring 2.Because the page that is contained in the box 3 is to be placed in to settle on the plate 1, so by settling plate 1 that the page front end is upwards pushed away page is contacted with push rolls 4.

Slipmat 5 with great friction coefficient is contained in arrangement plate 1 front upper surface.Slipmat 5 is fixed: when this place does not remain page, it can be contacted with push rolls 4 in such position.Also surplus during with a small amount of page on settling plate 1, slipmat 5 is used at page and settles friction force of maintenance between the plate 1, and prevents that remaining page from once sending into.

Will describe in more detail below the foregoing, supposing does not have slipmat 5 on arrangement plate 1, and in this case, the friction force between last page paper and the arrangement plate 1 is less than the friction force between the page.So, if should the left a spot of page in place, for example, remaining 5 or 6 paper, such phenomenon will usually appear: because sliding can appear greatly and not between page in friction force between the page, slide between it because friction force between last page paper and the arrangement plate 1 is little simultaneously, so that 5 or 6 pages of paper are once sent into.

So, during with a small amount of paper, once send into the slipmat element that is absolutely necessary in order to prevent remaining paper when surplus.

Yet the common page with above-mentioned slipmat is sent box to a shortcoming: when sending into last paper, may produce high-frequency vibration sound (bzzz sound).

The high-frequency vibration sound is mainly produced by the friction between slipmat and the last page paper.So,, just can not produce the high-frequency vibration sound if without slipmat 5.Yet surplus when a small amount of paper is arranged in page is sent box to, remaining paper will once be sent into, as described above like that.

So, can not omit slipmat.So, just wish to keep slipmat, do not produce the high-frequency vibration sound again.

So the present invention produces on the basis of the above, its objective is provides a kind of sheet feeding device, and it can not produce the high-frequency vibration sound, and has both made surplus and when a small amount of paper is arranged, also can send into page in a ground, is admitted to until last.

In brief, the present invention has provided a kind of sheet feeding device, it by designs fix in the position of the slipmat of settling the prelaminar part upper surface and the shape of slip-proof element, when sending into last paper, can not produce the high-frequency vibration sound, and when on settling plate, remaining the paper that has seldom, it can prevent that last page paper from sending into other paper, until surplus last paper only, thereby last paper once can not sent into.

Above-mentioned and other purposes of the present invention, feature, viewpoint and advantage are by following detailed description of the present invention and will be clearer with reference to its accompanying drawing.

Fig. 1 is the sectional view that common page is sent an example of box structure to.

Fig. 2 is the planar view that the page of one embodiment of the invention is sent box to.

Fig. 3 is the cutaway view along III among Fig. 2-III line.

Fig. 4 is the enlarged drawing that page is sent the box main portion among Fig. 3.

Fig. 5 is the slipmat planar view of other shapes.

Fig. 6 is the constructed profile of the sheet feeding device of another embodiment of the present invention.

Fig. 2 is the planar view that the page of one embodiment of the invention as described above is sent box to, and the position that is installed in a push rolls 11 on the image forming apparatus is represented with long and short dash line.

Fig. 3 is along the section-drawing of III-III line among Fig. 2.

Referring now to Fig. 2 and 3, the page holding portion 12 that page is sent in the box 10 has an arrangement plate 13.Settling plate 13 is a plate shape element, is used for laying the page that is contained in page holding portion 12.Settling plate 13 rear ends (left part among Fig. 2 and Fig. 3) that a bolster 15 is arranged, settling plate to shake around bolster 15.When page is sent box 10 to and is contained on the image forming apparatus, settle the front portion of plate 13 upwards to be pushed away, settle plate 13 front upper surface to contact to cause with the outer circumference surface of push rolls 11.

Settling plate 13 front upper surface to be formed with a pair of

recess

13a and 13b, a pair of

slipmat

14a and 14b are fixed among described a pair of recess 13a and the 13b.The line of centers that slipmat 14a and 14b send box 10 Widths to respect to page is with monosymmetric location arrangements, and has the shape of both sides symmetry.Each

slipmat

14a and 14b are by an aspect with roughly L shaped or its inverse shape.And the element with great friction coefficient (for example rubber) constitutes.

Present embodiment is characterised in that:

slipmat

14a and 14b are with such stationkeeping: they not with push rolls 11 direct contacts, as shown in Figure 3.In other words,

slipmat

14a and 14b are fixed in a part, and this part does not comprise the part with push rolls 11 direct contacts.

Though in the present embodiment,

slipmat

14a and 14b are fixed in

recess

13a and 13b, and slipmat also can be fixed in the upper surface that does not have the arrangement of recess plate 13 front portions.

Fig. 4 is the part sectional view of an amplification, has shown page, and the state of push rolls 11 and slipmat 14 has only remained a spot of page on this place's arrangement plate 13.Under the situation that number of sheets reduces, the existence of slipmat 14 has prevented that some page P1, P2 and P3 from sending into simultaneously.In this case, in position that page P1, P2 and P3 are pushed down with between near the leading edge of slipmat 14, form a little step.Yet when a small amount of paper was arranged, this small stair was useful for preventing that last page P3 and page P2 from sending into simultaneously when surplus.

More particularly, when the page P2 above push rolls 11 will be positioned at last page paper P3 sends to, because above-mentioned step and the toughness of page P3, and make last page P3 be compressed against the leading edge of slipmat 14.So, between last page P3 and slipmat 14 leading edges, produced friction force, so that last page P3 can not send into simultaneously with page P2.

As in the present embodiment, if slipmat 14 is the positions that are positioned at not with push rolls 11 direct contacts, when last page P3 was sent to, page just can directly not be sent to roller 11 and slipmat 14 is effectively pushed down so.So that just can not occur owing to pushing down the vebrato that produces tightly usually.On the other hand, slipmat 14 directly is not pressed against on the push rolls 11.Yet last page paper P3 contacts fully with slipmat 14 upper surfaces, and more particularly, last page P3 effectively is pressed against near slipmat 14 leading edges.So slipmat 14 can be carried out its original function, that is, prevent that last page P3 and remaining page P1 and P2 from sending into simultaneously.So surplus when a spot of page is arranged when sending at page in the box 10, its remaining page can once not sent into.

Fig. 5 A and Fig. 5 B are the planar views that has shown other embodiment of slipmat.Shown in Fig. 5 A and Fig. 5 B, if

slipmat

14a and 14b not with push rolls 11 direct contacts, this slipmat can be made shape arbitrarily.More particularly,

slipmat

14a and 14b can be such shapes, so that they can be fixed on the arrangement plate (5A with the aid of pictures) in the front side and the both sides of push rolls 11 along page feeding direction A1, it perhaps can be such shape, so that they can be along page feeding direction A1 in the front side of push rolls 11, rear side and both sides are fixed in and are settled on the plate (5B with the aid of pictures).

Much less, slipmat can be this shape arbitrarily (for example: square or circular), so that they can only be fixed in (not shown) on the arrangement plate in the rear side and the front side of push rolls.In addition, not need must be left and right double-type to slipmat.For example, the quantity of slipmat can be only one or more.

But slipmat must be fixed in such position, so that it does not directly contact with push rolls.

Though, send box to by a page above and be described as an embodiment, know that the present invention is not limited to page and sends box to.For example, the present invention also can be applied to have one as the flat-bed sheet feeding device that can pass through the power lifting of settling plate.

Fig. 6 is the constructed profile of the sheet feeding device 20 of another embodiment of the present invention.With reference to Fig. 6, sheet feeding device 20 has page container 22, and container 22 should be suitable for importing and be connected to the guide rail 25a and the 25b of sheet feeding device 20 front sides (Fig. 6 right part) and rear side (Fig. 6 left part), and can go out from the layback perpendicular to Fig. 6.Page container 22 has a platform 23, and platform is a plate shape element, is used to lay page.Platform 23 links to each other with a jacking system (not shown).By for example driving that comprises the motor of jacking system, make the lifting platform that is in horizontality.

The structure of the sheet feeding device 20 that the present invention can use is not limited to above-described structure, and sheet feeding device 20 can have other structure.

Sheet feeding device 20 according to present embodiment is characterised in that: the position of being fixed in the slipmat 24 of platform 23 anterior face should make its not with push rolls 21 direct contacts.More particularly, sheet feeding device 20 for example can be contained on the duplicator, and the push rolls 21 of duplicator engages with platform 23, and its installation site is represented by long and short dash line.By the rotation of push rolls 21, and will be placed on the platform 23 page one page of direction of arrow A 3 send into, and receive by duplicator.

In the sheet feeding device 20 of present embodiment, formed an auxiliary surface 23b in the front portion of platform 23, it is lower than flat-bed first type surface 23a and forms a step, and a slipmat 24 is fixed on the auxiliary surface 23b.More particularly, slipmat 24 is that side along step between first type surface 23a and the auxiliary surface 23b is fixed on the auxiliary surface 23b.Slipmat 24 surface elevations should equate with the height of first type surface 23a.

Replace such structure, the surface of platform 23 also can be made flat, can slipmat 24 is so fixing, so that its thickness can be given prominence to from this surface.

If the structure of sheet feeding device of the present invention is that for example a page is sent box to, so this page is sent box to and can be concluded the business individually or sell, and also can be used as a kind of annex of special device.

It also is applicable to have liftable flat-bed sheet feeding device.

In addition, the present invention is not limited to the sheet feeding device of image forming apparatus.For example, can be widely used in can be with page continuously or the sheet feeding device of sending into off and in the present invention.

Though the present invention has been made detailed description and diagram, should be clear that it only is as an illustration and gives an example, rather than as restriction, the spirit and scope of the present invention are only limited by the clause of following claim.

Claims

1, a kind of sheet feeding device wherein is equipped with a lot of pages, when it is contained on the predetermined equipment, can page be sent to by the push rolls on this equipment, and it comprises:

Be used to accommodate the page holding portion of page;

Be used to place the arrangement plate of the page that is positioned at described page holding portion, can upper and lower motion in the front portion of the described at least arrangement plate of page feeding direction;

At least when sending page to, be used for upwards promoting the propelling unit of described arrangement plate to cause page to contact with described push rolls;

Be installed in the slipmat of described arrangement prelaminar part upper surface along the page feeding direction, the position of described slipmat should make its not with described push rolls direct contact.

2, sheet feeding device as claimed in claim 1 is characterized in that: push rolls was pushed down near the position of page when an edge of described slipmat was positioned to send page to.

3, sheet feeding device as claimed in claim 2 is characterized in that: surplus when a small amount of paper is arranged on settling plate, sending roll-in to toward step of formation between the edge of the position of page and described slipmat.

4, sheet feeding device as claimed in claim 1 is characterized in that: described slipmat is an element with arbitrary plane shape, and a predetermined thickness is arranged.

5, sheet feeding device as claimed in claim 4 is characterized in that: this device comprises two slipmat, and they are arranged along the direction bilateral symmetry ground of sending to perpendicular to page.

6, sheet feeding device as claimed in claim 5 is characterized in that: two slipmat with the bilateral symmetry location arrangements have monosymmetric aspect.

7, sheet feeding device as claimed in claim 1 is characterized in that this sheet feeding device comprises that a page sends box to.

8, sheet feeding device as claimed in claim 7, it is characterized in that: the edge of described slipmat is positioned described push rolls and pushes down near the position of page, this slipmat is fixed in settles on the plate, and forms a step at this place, makes the surface of slipmat exceed the surface of settling plate a little.

9, sheet feeding device as claimed in claim 7 is characterized in that: described slipmat is an element with arbitrary plane shape, and preset thickness is arranged.