JPH07108736B2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a sheet feeding device in a copying machine, a printer, a facsimile, and the like, and more particularly, when manually feeding sheets, stacked sheets in a sheet feeding cassette. However, the present invention relates to a sheet feeding device that prevents the sheet from being taken out by the manual sheet and being fed in a double feed manner.

(B) Conventional technology In the past, in copying machines, printers, facsimiles, etc., in addition to the automatic paper feeder that automatically feeds the stacked paper sheets into the apparatus, the paper sheets can be manually fed as needed by the user. It also has the function of manual paper feeding.

An example of a conventional paper feeding device of this type will be described with reference to FIG. In FIG. 9, a paper feed cassette 3 having a lid 2 at the top has a bottom plate 6 whose rear portion is pivotally attached to the paper feed cassette 3 by a shaft 5, and a plurality of sheets are placed on the bottom plate 6. 7 are stacked. The lever 9 inserted in the hole 3a formed in the front portion of the paper feed cassette 3 is biased in the direction of the arrow around the shaft 10. By pressing the free end of the lever 9 against the front part of the bottom surface of the bottom plate 6, the bottom plate 6 and the front part of the stacked sheets 7 are lifted upward.

A paper feed roller 11 is provided in the vicinity of the front of the paper feed cassette 3, and guide plates 13 and 15 that form a transport path 12 are provided downstream of the paper feed roller 11, and the lower end of the guide plate 13 is provided. The separation pad 16 adhered to the abutment portion is in contact with the lower peripheral surface of the paper feed roller 11. The paper feed roller 17, the guide plates 13 and 15, the separation pad 16 and the like constitute a paper feed section 17.

A guide member 19 is disposed in the vicinity of the front upper portion of the lid 2 of the paper feed cassette 3 and is provided with the lid 2 and a manual insertion slot.
Forming 20. The rear portion of the detection lever 21 is pivotally attached to the guide member 19 by a shaft 22, and the front end of the detection lever 21 is in contact with the sheet 7 by its own weight.

The leading edge 7a of the stacked sheets 7 is the peripheral surface 11a of the sheet feeding roller 11.
When the paper feed roller 11 is rotated in the direction of the arrow, the stacked paper sheets 7 in the paper feed cassette 3 are separated by the separation pad 16 and sent one by one to the transport path 12, and The paper is fed into the apparatus main body (not shown) arranged downstream (left in FIG. 9). On the other hand, when manually feeding the paper 23, the paper 23 is placed on the lid 2 of the paper feeding cassette 3 and inserted into the insertion port 20 in the direction of the arrow, and the leading end 23a of the manual paper 23 is fed to the paper feeding unit 17 It is carried out by inserting it between the paper feed roller 11 and the separation pad 16. At the time of manual feeding, the paper 7 on the side of the paper feeding cassette 3 is separated from the manual paper 23 by the separation pad 16 and is prevented from moving to the transport path 12.

(C) Problems to be Solved by the Invention In the above-described conventional paper feeding device, the paper is manually fed.
When 23 is fed, the stacked sheets 7 in the sheet cassette 3 are separated by the separation pad 16. However, if the manual feeding is repeated many times, the stacked sheets 7 are manually fed. It may be gradually taken out due to the friction with the paper 23, and eventually it may go deeper into the conveyance path 12 beyond the separation pad 16 and may be double-fed in the main body together with the manual paper 23. It was

In view of the above, the present invention provides a paper feed that can prevent the stacked papers from being double-fed together with the manual paper by exerting a resistance effect on the advance of the stacked papers in the paper feed cassette when the paper is manually fed. To provide a device.

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances, and is a sheet storage member for storing stacked sheets, and sheets stacked and stored in the sheet storage member. Abut
A rotary paper feeding means for feeding the paper from the paper storing member, a separation pad for pressing the rotary paper feeding means to separate the paper fed by the rotary feeding means one by one, and a separating pad other than the paper storing member. A sheet feeding device having a receiving member for guiding another sheet along the upper surface of the sheet stored in the sheet storing member between the rotary sheet feeding means and the separation pad, The uppermost sheet of the sheets stored in the member is brought into contact with the upper surface of the sheet and exerts resistance against the movement of the uppermost sheet in the sheet feeding direction due to the movement of another sheet guided by the receiving member. It is characterized in that an engaging member is provided.

Further, in the invention of the present application, the engaging member is movably provided between an operating position for engaging the uppermost sheet and a retracted position separated from the sheet, and from the operating position to the retracted position. It is elastically urged, and is moved from the retracted position to the operating position against the elastic urging by pressing the sheet when the other sheet is moved.

Further, in the paper feeding device of the present invention, the paper storing member is a paper feeding cassette, the receiving member is a lid of the paper feeding cassette, and the engaging member is provided at the tip of the lid on the rotary paper feeding means side. It is characterized by being arranged.

(E) Operation Based on the above configuration, the sheets stacked in the sheet storage member are separated and fed one by one from the uppermost side by the rotary sheet feeding means and the separation pad. Another sheet other than the sheet storage member is guided between the rotary sheet feeding unit and the separation pad by the receiving member. At this time, as another sheet moves, a force (frictional force) is sent to the uppermost sheet stacked in the sheet storage member to the side of the rotary sheet feeding means, but the engagement member causes the sheet storage member to move. It is in contact with the uppermost sheet stacked on the member, and the engaging member exerts resistance against the movement of the uppermost sheet in the sheet feeding direction. Therefore, the uppermost sheet stacked on the sheet storage member does not overlap with another sheet, and only the other sheet is placed between the rotary sheet feeding unit and the separation pad along the upper surface of the uppermost sheet. The sheet is conveyed and another sheet is fed by the rotary sheet feeding means.

Further, in the paper feeding device of the present invention, the engagement member causes the other sheet to move when the other sheet is guided to the receiving member and moves along the upper surface of the uppermost sheet stacked on the sheet storage member. The sheet is pressed against the uppermost sheet stacked on the sheet storage member to resist the movement of the uppermost sheet in the feeding direction. On the other hand, when another sheet is not conveyed, the engaging member moves from the operating position to the retracted position by the elastic bias and separates from the uppermost sheet stacked on the sheet storage member. The reference numerals in parentheses above are for reference only and shall not be construed as limiting the structure of the present invention.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

The same components as those shown in FIG. 9 are designated by the same reference numerals, and the description thereof will be omitted.

In FIGS. 1 to 3, a plurality of elastic plates 31 are fixed to the front portion of the back surface of the lid (receiving member) 2 of the paper feeding cassette (paper storing member) 3. At the top end of the elastic plate 31, a pressed member 32 that is pressed by the back surface of the manual paper 23 is used.
However, the engaging members 33 made of a pad having a large frictional resistance are fixedly attached to the lower ends.

In FIG. 4, when the manual sheet (another sheet) 23 is not inserted in the manual insertion slot 20, the elastic plate 31 is at the retracted position shown by the solid line and the engaging member 33 is laminated. It is in a state of being separated from the sheet 7. In this state, the stacked paper 7 is fed from the paper feed unit 17 into the apparatus main body by the rotation of the paper feed roller (rotary paper feed means) 11 in the arrow direction.

When the manual paper 23 is inserted into the manual insertion slot 20,
As shown in FIG. 1, the manual paper 23 pushes the pressed member 32 by the strength of its waist to push down the elastic plate 31. When the elastic plate 31 descends from the retracted position shown by the solid line in FIG. 4 to the operating position shown by the broken line, the engagement member 33 is pressed against the upper surface of the stacked sheets 7. Due to this pressure contact action, even if friction occurs between the manual paper 23 when the manual paper 23 is sent between the paper feed roller 11 and the separation pad 16, the stacked paper 7 is taken out by the manual paper 23 into the transport path 12. The phenomenon, double feed, is prevented. As a result, even if the manual paper feeding is continuously performed, the stacked paper 23 is always provided with the action of resisting the forward movement by the engaging member 33, so that the manual paper feeding is stabilized. Can be done by

FIG. 5 shows a paper feeding device provided with an automatic manual feeding device 35 capable of automatically performing a manual feeding operation. If the manual paper 23 is, for example, an envelope, and the number of sheets is small, it may be manually performed, but if the number of sheets is large and it is desired to automatically feed paper,
A dedicated automatic manual feeding device 35 is optionally provided in the paper feeding device.

The paper feed cassette 3 is detachably inserted into the opening between the frames 36a and 36b of the apparatus main body 36.
A hook 35a of an automatic manual insertion device 35 is detachably attached to an attachment hole 37 formed between 36a and 36c. The automatic manual feed device 35 includes a paper feed roller 40 having an upper peripheral surface extending from a hole provided in a front portion of a bottom plate 39, and a plurality of manual paper feed sheets 23.
Paper presser 41 that presses the front part of the
3, a separation pad fixed to the back surface of the upper guide plate 42, and a transport roller pair 45 disposed downstream.

When the optional side of such a sheet feeding device, that is, the use of the automatic manual feeding device 35 is selected and the manual sheet 23 made of, for example, an envelope is fed, the lowermost manual sheet is fed by the rotation of the sheet feeding roller 40 in the arrow direction. Sheets 23 are automatically fed to the insertion slot 20 one by one. Manual paper 23 is paper cassette 3
When passing through the guide passage formed by the lid 2 and the guide member 19, the engaging member is similar to the device of FIGS. 1 and 4.
33 is pushed down to press the upper part of the stacked sheets 7 in the sheet feeding cassette 2. Due to this pressing, even if the manual paper 23 is fed while rubbing against the stacked paper 7, the forward movement of the paper 7, that is, the double feeding is prevented as in the above-described embodiment.

FIG. 6 shows an example in which the stacked sheets 7 are always pressed even when the manual sheet 23 is not fed. As shown in FIG. 7 and FIG. 8, the base of the elastic plate 46 is fixed to the back surface of the pair of protrusions 2a formed on the front part of the lid 2 of the paper feeding cassette 3. The free end of is separated downward from the back surface of the projecting piece 2a as shown in FIG. Further, on the back surface of the free end of the elastic plate 46, an engaging member 33 similar to that in the above embodiment is provided.
Is stuck.

When the lid 2 having the elastic plate 46 is attached to the paper feeding cassette 3, the engaging member 33 is constantly pressed against the stacked sheets 7 in the paper feeding cassette 3 by the elasticity of the elastic plate 46. There is. Then, the manual paper 23 that is guided and moved by the upper surface of the lid 2 passes without pressing the elastic plate 46. Paper feeder
If the sheet feeding force of 17 is large enough, the sheets 7 can be automatically fed even if the stacked sheets 7 are constantly pressed by the engagement member 33, and even if the manual sheet 23 is inserted into the sheet feeding unit 17, the sheets 7 are stacked. It is possible to prevent the taken-out sheet 7, that is, the double feeding.

It should be noted that, in the above-described embodiment, the stacked paper sheets 7 are stored and the manual paper sheets 23 are received by the paper feed cassette 3 and the lid 2 thereof.
However, they may be a paper feed deck and a dedicated manual feed tray.

(G) Effect of the Invention As described above, the present invention utilizes the receiving member,
When guiding another sheet of paper between the rotary paper feeding means and the separation pad,
It is possible to prevent the paper in the paper storage member from being sent out to the rotary paper feeding unit in accordance with the movement operation of another paper, and it is possible to prevent the paper from being taken out due to the conveyance of another paper,
Double feeding of paper when feeding another paper is prevented.

In particular, when another sheet is continuously fed, even if the leading-out action of another sheet continuously acts on the uppermost sheet of the sheet, the sheet is fed from the sheet storage member, that is, the weight of the sheet is not fed. It can be prevented from being sent.

Further, in the present invention, while preventing the removal of the uppermost sheet in the sheet storage member by the conveyance of another sheet other than the sheet storage member, the operation of feeding another sheet is performed.
When another paper is not fed, it does not resist the movement of the topmost paper in the paper storage member in the paper feed direction, preventing the topmost paper in the paper storage member from moving in the paper feed direction. It is possible to suppress the movement of the uppermost sheet in the sheet feeding direction only by feeding another sheet without performing a special operation for performing the above operation.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a main part of a sheet feeding device showing an embodiment of the present invention, FIG. 2 is a plan view of a lid of a sheet feeding cassette, and FIG.
FIG. 4 is a perspective view of an engaging member portion, FIG. 4 is an operation view of the apparatus shown in FIG. 1, and FIG. 5 is a vertical sectional side view of a paper feeding apparatus having an automatic manual feeder to which the present invention is applied. FIG. 7 is a vertical sectional side view of a paper feeding device showing another embodiment of the present invention, FIG. 7 is a plan view of the lid of the paper feeding cassette, and FIG. 8 is an engaging member provided on the lid of FIG. FIG. 9 is a perspective view of the elastic plate, and FIG. 9 is a vertical sectional side view showing an example of a conventional sheet feeding device. 2 ... receiving member (lid of paper feed cassette), 3 ... paper feed cassette (paper storage member), 7 ... paper stacked in paper feed cassette, 11 ... paper feed roller, 17 ... paper feed section , 23 …… Manual paper (other paper), 31, 46 …… Elastic plate, 33 …… Engagement member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-56-145043 (JP, A) Actually open 60-159739 (JP, U) Actually open 62-50141 (JP, U) JP-B 61- 50860 (JP, B2)

Claims (3)

[Claims] 1. A paper storage member for storing stacked paper, and abutting paper stacked and stored in the paper storage member,
A rotary paper feeding means for feeding the paper from the paper storing member, a separation pad for pressing the rotary paper feeding means to separate the paper fed by the rotary feeding means one by one, and a separating pad other than the paper storing member. A sheet feeding device having a receiving member for guiding another sheet along the upper surface of the sheet stored in the sheet storing member between the rotary sheet feeding means and the separation pad, The uppermost sheet of the sheets stored in the member is brought into contact with the upper surface of the sheet and exerts resistance against the movement of the uppermost sheet in the sheet feeding direction due to the movement of another sheet guided by the receiving member. A sheet feeding device comprising an engaging member. 2. The engaging member is movably provided between an operating position for engaging the uppermost sheet and a retracted position separated from the sheet, and elastic from the operating position to the retracted position. The paper feeding device according to claim 1, wherein the paper feeding device is biased and moves from the retracted position to the operating position against the elastic bias by pressing the paper when the another paper moves. 3. The paper storage member is a paper feed cassette,
3. The paper feeding device according to claim 1, wherein the receiving member is a lid of the paper feeding cassette, and the engaging member is arranged at a tip of the lid on the rotary paper feeding means side.