JPH01156269A - Sheet delivery device - Google Patents

Abstract

PURPOSE:To enable a device of a small size to be employed by constituting a device in such a way that sheet reversal delivery device can be mounted on a section from which a sheet delivery table is moved or removed, and thereby eliminating a delivery path. CONSTITUTION:In case of face down mode wherein an image face is loaded while being directed downward, the boss section 30a of a delivery tray 30 is disengaged from a groove 2a so that the delivery tray 30 is removed from a machine 2. Then, a projection 32b at the both ends of a reversal delivery device 32 is engaged with the groove 2a so that the reversal delivery device 32 is mounted on the machine 2. In this case, the rotating position of a gear 36a is adjusted in such a way that a gear 31 is meshed with the gear 36a. And a sheet S on which an image is printed is transferred to the reversal delivery device 32 by means of a delivery roller 29, is guided to a delivery roller 35 while the front of it is being reversed to the back by means of a reversing guide 32 in a rib and an U-shape configuration, is held between the roller 35 and the guide 32, and then, is delivered onto the machine 2 with its image face directed downward.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a sheet discharging device used in image forming devices and image reading devices such as copying machines and laser beam printers. This invention relates to a sheet discharging device that stacks sheets upward or downward.

(B) Prior Art Conventionally, image forming apparatuses (hereinafter referred to as laser beam printers) equipped with a sheet discharge device that stacks the image surfaces of sheets upward or downward have been known. As shown in Figure 7fal, (bl), the fuselage 2 has a detachable cassette 3, and a separation pad 4 is attached to the tip of the cassette 3.
Furthermore, a paper feed roller 5 for feeding the sheets S is disposed above the cassette 3. A pair of registration rollers 6 for synchronously conveying the sheet S is disposed downstream of the rollers 5, and an image forming unit for forming an image using a laser signal from a laser scanner section 7 is provided downstream of the pair of rollers 6. A section 9 is provided. Further, downstream of the image forming section 9, a conveying section 10, a fixing plate 11, and a discharge pair 12 are arranged in this order.

- A flapper 13 for branching and guiding the sheet S is disposed downstream of the pair 12. Further, a discharge port 15 is provided downstream of the flapper 13, and the downstream side of the discharge port 15 is movable between a storage position A where the images of the sheet S are stacked upward and a sea 1-accumulation position B. A paper discharge tray 16 is provided. A discharge path 17 is provided which branches off from the flapper 13 and reverses the front and back of the sheet S, and downstream of the path 17, the sheet S is transferred to the paper discharge tray 2a formed by the upper surface of the machine body 2 on the image surface. A discharge roller 19 is provided to discharge the paper downward.

&→ Problems to be solved by the invention By the way, in the above-mentioned laser beam printer 1a,
In addition to the necessity of stacking the images of the sheets S downward 1ζ, the discharge path 17 and the discharge roller 19 are disposed downstream of the flapper 13, which has the drawback of increasing the size of the apparatus.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sheet discharging device that solves the above-mentioned problems by making a sheet reversing device of a simple configuration removable from a machine body.

(B) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, as shown with reference to FIGS. Sea 1-(S) with image formed
In a sheet discharging device comprising a paper discharging platform (30) for accumulating paper, the discharging platform (30) is configured to be movable or detachable, and the portion where the discharging platform (30) is moved or removed. The present invention is characterized in that a sheet reversing and discharging device (32) for reversing and discharging the sheet (S) can be attached thereto.

(e) Operation Based on the above-described configuration, if the sheet (S) is not turned over, the sheet (S) is directly discharged onto the paper discharge table (30). Also, when discharging the sheet (S) with the front and back sides reversed,
The operator moves or removes the sheet discharge tray (30), attaches a sheet reversing and discharging device (32) to the moved or removed portion of the sheet discharging tray (30), and reverses and discharges the sheet (S).

(f) Example Embodiments of the present invention will be described below along with the drawings.

As shown in FIG. 1, the laser beam printer 1 has a paper feed tray 3 protruding from the body 2 and loaded with a plurality of sheets S. S
A separation pad 4 for separating and feeding paper sheets one by one and a paper feeding roller 5 in the form of an occluded circle are provided. An auxiliary roller 20 is freely rotatably supported on the shaft 5a of the roller 5.
The auxiliary roller 20 comes into contact with the separation pad 4 when the paper feed roller 5 is not feeding paper. Further, downstream of the separation pad 4, a conveyance roller 21 is disposed in pressure contact with the auxiliary roller 20, and the conveyance roller 21 is connected to a drive means (not shown). Further, an image forming section 9 that forms an image using a laser signal from the laser scanner section 7 is disposed downstream of the conveyance roller 21.
The image forming section 9 includes a charging roller 23 disposed around the photoreceptor 22 for charging the photoreceptor 22, a developing device 25, and a transfer roller 26. A fixing unit 11 is disposed downstream of the image forming section 9, and downstream of the fixing unit 11, an image formed by a discharge guide 27 and a sponge o-ra for sandwiching and discharging the sheet S is disposed. A discharge roller 29 whose conveyance speed is slightly faster than the sheet conveyance speed of the fixing device 11 is provided.
A paper discharge tray 30 for stacking the image surfaces of the sheets S upward is disposed downstream of the paper tray 9 .

Further, as shown in FIGS. 2(a) and 2(bl), the paper ejection tray 30 has boss portions 30a formed on both sides of the base end, and the boss portions 30a are in contact with the groove portions 2a provided in the body 2. The paper ejection tray 30 is supported by engagement.A gear 31 that rotates together with the ejection roller 29 is disposed adjacent to the groove 2a.

Further, as shown in FIG. 3, a sheet reversing and discharging device 32 can be attached to the portion where the paper discharging tray 30 is removed from the machine body 2.

The sheet reversing and discharging device 32 is operated as shown in FIG.
, (as detailed in bl, tc+, the device main body 3
2a is provided with protrusions 32b on both sides, and when the protrusions 32b engage with the grooves 2a, the sheet reversing and discharging device 3
2 is configured to be supported by the fuselage 2 (see FIG. 3). Further, the reversing and discharging device 32 is equipped with a large number of rib-shaped and U-shaped reversing guides 33.
A discharge roller 35 having the same circumferential speed as the discharge roller 29 or a slightly higher circumferential speed is disposed at the downstream end of the discharge roller 29 . Furthermore,
Gear trains 36 a and 36 b are provided on one side of the device main body 32 a.
, 36 c.

36 d and 36 e are arranged, and the gear 36 e
is fixed to the shaft 35a of the discharge roller 35.

The gear 36a meshes with the gear 31, so that power is transmitted to the paper discharge roller 35.

Since this embodiment has the above-described configuration, in the face-up mode, when an image signal is transmitted from an external device (not shown) to the laser beam printer 1, the laser beam printer 1 receives the image signal from the external device. Based on this, an image is formed on the image forming section 9 by the laser scanner section 7. At this time, only the uppermost sheet S is separated and fed from the paper feed tray 3 by the separation pad 4 and the paper feed roller 5,
The sheet S is conveyed by an auxiliary roller 20 and a conveyance roller 21 in synchronization with the image on the image forming section 9 .

Then, an image is printed on the sheet S by the image forming section 9, and the sheet S is conveyed to the fixing device 11 by the conveyance force of the photosensitive drum 22 and the transfer roller 26. Then, the sheet S is
The image is fixed by the fixing device 11, and the sheet is discharged onto the discharge sheet 1-ray 16 with the image surface facing upward.

In addition, in the face-down mode in which images are stacked with the image surface facing downward, the operator can remove the paper output tray 30 from the machine body 2 by disengaging the boss portion 30a of the paper output tray 3o from the groove 2a. (a).

fbl), the reversing and ejecting device 32 is attached to the body 2 by engaging the protrusions 32b on both sides of the reversing and ejecting device 32 with the grooves 2a (see FIG. 3). At this time, the operator adjusts the rotational position of the gear 36a so that the gear 31 and the gear 36a mesh with each other (see Fig. 4 (cl)). The paper is conveyed to the reversing and discharging device 32 by the rollers 29, reversed from front to back by the rib-shaped and U-shaped reversing guide 32, and guided to the discharging rollers 35.
It is held between the two and discharged onto the upper surface of the fuselage 2 with the image surface facing downward.

Note that when the paper ejection tray 30 is configured to be installed downstream of the paper ejection roller 35 of the reversing ejection device W32, the sheet S can be effectively utilized without worrying about where to place the paper ejection tray 30. It is possible to improve alignment and loading efficiency.

Further, in the above embodiment, the reversing and discharging device W132 reversely conveys the sheet S upward and discharges it onto the upper surface of the machine body 2. However, the present invention is not limited to this, and as shown in FIG. A reversing and discharging device 32 that reverses and collects on a tray 37
' may also be used.

Furthermore, in the above embodiment, the reversing and ejecting device 32
Although the driving force is obtained from the inside, the present invention is not limited to this, and a motor may be provided in the reversing and discharging device 32 as a driving source.

In the above embodiment, the sheet reversing and discharging device 32 is attached to the laser beam printer 1, but the invention is not limited to this, and as shown in FIG. 6, the sheet reversing and discharging device 32 may be attached to the image reading device 1'. You may.

Further, in the above embodiment, the paper ejection tray 3o is removed from the machine body 2, but the invention is not limited to this, and the paper ejection tray 30 may be moved from the paper ejection position. You won't have to worry about where to put it.

(g) As described in detail, according to the present invention, the sheet reversing and ejecting device can be attached to the part where the sheet ejecting tray is moved or removed, so the ejecting path is omitted and the device can be easily operated. Can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an image forming apparatus equipped with the present invention. In addition, FIGS. 2(al, bl) and 3 are diagrams showing the operation of the present invention.Furthermore, FIGS. (al is a side view, (bl is a front view, and (e) is a front sectional view. FIGS. 5 and 6 are front sectional views showing other embodiments of the present invention 2. 7(a), (bl is a front cross-sectional view showing a conventional example. 29... Sheet discharge means, 30... Paper discharge tray,
32...Sheet reversal and discharge device, S...Sheet.

Claims (3)

[Claims] (1) In a sheet discharging device comprising a paper discharging tray for accumulating images-formed sheets discharged by a sheet discharging means, the sheet discharging tray is configured to be movable or detachable, and the sheet discharging tray is moved. Alternatively, a sheet discharging device characterized in that it is configured such that a sheet reversing and discharging device for reversing and discharging the sheet can be attached to the removed portion. (2) The sheet discharging device according to claim 1, wherein the sheet reversing and discharging device reverses the front and back of the sheet. (3) The sheet discharging device according to claim 1, wherein the sheet reversing and discharging device includes a discharging rotary body, and the discharging rotary body is configured to rotate by power from the sheet discharging means.