JPH05186104A - Sheet carrying device and image forming device - Google Patents

Abstract

PURPOSE:To attain manual sheet feed easily by always arranging a carrying passage for manual feed at a prescribed position. CONSTITUTION:A sheet carrying passage which consists of a sheet guide member 21 and a leading guide 22 is formed between a cassette 6 and a sheet feed roller 10. At least a part of the sheet made member 21 on the more downstream side than the sheet feed roller 10 is made displaceable to the sheet feed roller 10 side, so that it is possible to always provide the carrying passages at a prescribed position, and eliminate unnecessary motion for manual feed to enable easy manual sheet feed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device having a sheet conveying path between a cassette and a sheet feeding roller and having a sheet conveying guide displaceable.

[0002]

2. Description of the Related Art Conventionally, a sheet conveying path between a cassette and a sheet feeding roller is usually used as a conveying path for manually feeding a sheet. Therefore, the sheet feeding path is inserted between the cassette and the paper feed roller only when the manual paper is fed, and the manual paper feeding operation is enabled, and it does not disturb the cassette paper feeding operation during normal cassette paper feeding. It is in the retracted position.

Some printers and the like are capable of reversing the sheet conveyance direction, and in such a case, the sheet conveyance path is used as a paper accommodation space. As a structure, the paper feed roller swings to retract from the path in order to secure a conveyance path, and a lid on the upper surface of the cassette is used as a paper guide.

[0004]

However, in the above-mentioned conventional example, not only is it troublesome to set the sheet conveying path to a predetermined position each time manual feeding is performed, but also the retracting is performed when the sheet is not used. However, the storage space is required for the device, which causes unnecessary increase in size of the device. Also, in the printer example,
In order to secure the path, a mechanism for retracting the paper feed roller is required, and when the cassette is removed, the sheet transport path is not configured and the paper cannot be stored at a predetermined position.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sheet conveying apparatus in which a manual feeding path can be always arranged at a predetermined position and manual feeding can be easily performed.

[0006]

The present invention has been made in view of the above, and, for example, as shown with reference to the drawings, a cassette (6) for accommodating a plurality of sheets (P) and a sheet (P). In a sheet conveying device having a manual feed path (21, 22) between a sheet feeding roller (10) for feeding
A part of the sheet guide member (21) constituting the manual feed passage that is located downstream of the paper feed roller (10) is displaceable toward the paper feed roller (10).

The sheet guide member (21) is a flexible member along the sheet conveying direction, and its fixed end is provided upstream of the paper feed roller (10).

[0008]

According to the above construction, the sheet material (P ₂ ) for manual sheet feeding is guided by the manual sheet feeding passages (21, 22) including the guide guide (22) and the sheet guide member (21) and is fed. It When the sheet is fed from the cassette (6), the sheet guide member (21) is fed by the sheet feeding roller (1).
By being displaceable to the 0) side, the loop formation of the sheet material (P) is easily performed and separated reliably. Thereby, the cassette (6) and the paper feed roller (10)
Since the sheet conveying path can be always arranged between them, the manual feeding can be easily performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a cross section of a manual sheet feeding section in which the present invention is applied to an image forming apparatus 1. Cassette 6
The sheet P is stored in the sheet, and the sheet P is separated by the separating claw 9.
It is configured to separate and feed the sheets one by one. Arm 12
Pick-up roller 10 pivotally supported by a shaft 13 at its free end
Is normally supported at the position shown in the figure, and the base of the arm 12 is rotatably supported by the shaft 11. The apparatus main body 2 has an opening 5 for manual feeding and an opening 3 for cassette, and a paper guide 21 and a guide on the side of the paper feeding roller which constitute a manual feeding path for conveying a manual feeding sheet between the cassette 6 and the paper feeding roller 10. A guide 22 is provided.

The upstream end of the paper guide 21 is mounted on the main body 2 of the apparatus in a state of being along the sheet feeding direction.
It is attached to a.

The operation during manual sheet feeding will be described with reference to FIG. When the manual feed sheet P ₂ is inserted through the manual feed opening 5,
The manual feed detection lever 23 is swung to generate a manual feed status signal. The sheet P ₂ passes through a conveyance path composed of a paper guide 21 and a guide guide 22, and reaches the conveyance guide 15 of the apparatus main body. At this time, the sheet feeding roller 10 is retracted upward so that it does not interfere with the insertion of the sheet P ₂ .
After that, the detection lever 19 for notifying the completion of the setting of the paper is swung around the support shaft 17 so that the carrying roller of the apparatus main body starts to rotate and the sheet P ₂ is carried, and the manual paper feeding operation is completed.

Next, the operation when the cassette is fed will be described with reference to FIG. When receiving the signal from the cassette feeding means, the sheet feeding roller 10 is lowered to the position 10A where it contacts the sheet P of the cassette 6 by the rotation operation of the arm 12 to the 12A position, and the sheet feeding roller 10 starts sheet feeding rotation. The uppermost sheet P ₁ is separated and fed by the action of the separating claw 9. At that time, as can be seen in FIG. 4, the leading end of the sheet P _{1 in} the vicinity of the separation claw 9 forms a loop and lifts high. At this time, the paper guide 21 is made of a flexible material, and is fixed to the main body of the apparatus at 25 on the upstream side of the sheet roller 5 in the sheet conveying direction.
The sheet P ₁ is easily moved to the position 21A without hindering the formation of the loop of the sheet P ₁ , and the sheet feeding operation is completed.

Further, as can be seen from FIG. 4, the sheet P
_Since the loop at the time of separation ₁ is generated in the vicinity of the separation claw 9, at a position unrelated to the loop, the portion of the attachment portion 2a of the apparatus main body 2 supporting the paper guide 21 is fed in the sheet conveying direction. Separation is not affected even if it is extended downstream of the paper roller 10 as shown by 2a '(FIG. 4). With this configuration, it is possible to prevent the paper guide 21 from being bent during manual feeding. <Embodiment 2> Next, an example of a printer device capable of reversing the sheet conveyance direction will be described with reference to FIG.

FIG. 3 is a cross-sectional view of the printer device 2 which uses a valve jet head 30 as a recording means and repeatedly performs serial scanning on a sheet P along a scanning rail 31. Since the pair of rollers 16 and 33 for conveying the sheet are configured to be capable of rotating in the forward and reverse directions, for example, when the sheet is inserted from the tray 36 through the opening 37 of the apparatus 2 and conveyed from the pair of rollers 33, the sheet is the pair of rollers 16. Pass through the paper guide 21
It is stored in the sheet conveying path constituted by a and the guide guide 22. At this time, the sheet feeding roller 10 is retracted upward by the support arm 12 as described above, so as not to obstruct the path. Then, the roller pair 16, 16,
By rotating the sheet 33 in the forward direction, the recording means 30 is attached to the sheet P.
Use to record. Next, in the case of cassette sheet feeding, the sheet feeding roller 10 is lowered to separate the sheet P and feed the sheet, as described above. At this time, the paper guide 21 has a portion 21a made of a thin plate-shaped member at a portion downstream of the paper feed roller 10 with respect to the sheet conveying direction, and is displaced toward the paper feed roller about a rotation center 41. Since the sheet material P is configured to be capable of being moved, when a loop of the sheet material P occurs at the time of sheet feeding, the sheet material P moves to a position shown by a broken line and does not hinder the separation performance.

Next, the structure of the sheet conveying path in the case of using a cylindrical cut-out part (hereinafter referred to as a half-moon roller) for the paper feed roller will be described with reference to FIG. The configuration is the same as that of the above-described embodiment except the half-moon roller 40 which is a paper feed roller. If the half-moon roller 40 is used, the portion 4 of the half-moon roller 40 that does not come into contact with the sheet P when cassette feeding is not performed.
0a can be directed to the sheet P side, and a space can be provided between the cassette 6 and the half-moon roller 40.

Therefore, the swinging operation for retracting the paper feed roller 10 as in the above-described embodiment is unnecessary. However, when the sheet P is introduced into the sheet conveying path, a jam occurs when the sheet P is caught by the half-moon roller 40, so that the flange P 40a of the half-moon roller 40 can introduce the sheet P into the path. .. Although the flange portion 40a of the half-moon roller 40 is used as a paper guide here, it is of course possible to form another paper guide member on the paper feed roller drive shaft.

[0018]

As described above, the sheet conveying path is formed between the cassette and the sheet feeding roller, and at least a part of the sheet guide in the path is downstream of the sheet feeding roller with respect to the sheet conveying direction. By allowing the sheet to be displaced to the side, it is possible to always install the transport path at a predetermined position, eliminate unnecessary operation for manual feeding, and easily perform manual feeding. In addition, by using a half-moon roller as the paper feed roller and guiding the paper at the half-moon roller flange, it is possible to secure the transport path with the paper feed roller fixed, and simplify the configuration. Also, cost advantages can be realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a manual paper feeding unit according to the present invention.

FIG. 2 is a diagram showing a manual feed state of FIG.

FIG. 3 is a diagram showing a cassette sheet feeding state of FIG. 1;

FIG. 4 is a perspective view showing a paper loop when the cassette of FIG. 1 is fed.

FIG. 5 shows an embodiment of a printer capable of forward and reverse rotation.

FIG. 6 is an example of a printer using a half-moon roller.

[Explanation of symbols]

 P sheet 1 image forming apparatus 2 apparatus body 6 cassette 10 paper feed roller 21 sheet guide member 22 guide guides 21 and 22 manual feed passage

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B65H 3/44 F 9148-3F 3/66 9148-3F

Claims (4)

[Claims] 1. A sheet conveying device having a manual feed passage between a cassette for storing a plurality of sheets and a paper feed roller for feeding the sheets, wherein a sheet guide member constituting the manual feed passage is provided in the paper feed roller. A sheet conveying device, wherein a portion on a more downstream side is displaceable to the sheet feeding roller side. 2. The sheet conveying apparatus according to claim 1, wherein the sheet guide member is a flexible member along the sheet conveying direction, and its fixed end is provided on the upstream side of the sheet feeding roller. 3. A manual feed passage is provided between a cassette for storing a plurality of sheets and a paper feed roller for feeding the sheets,
In an image forming apparatus provided with an image forming means for forming an image on a sheet sent from the cassette or a manual feed passage, a sheet guide member constituting the manual feed passage has a portion downstream of the paper feed roller of the paper feed roller. An image forming apparatus characterized in that it can be displaced to the side. 4. The sheet image forming means energizes the electrothermal converter in response to a signal, and ejects ink from the ejection port due to the growth of bubbles caused by heating beyond film boiling by the electrothermal converter. The sheet conveying apparatus according to claim 3, wherein the sheet conveying apparatus is an inkjet recording apparatus that performs recording by performing recording.