JPH04144878A - Discharged paper stacking device of recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention is applicable to recording devices that record on recording media by printing, copying, printing, etc., such as printers, copying machines, facsimile machines, printing machines, etc. I can do it.

More specifically, the present invention relates to a discharged sheet stacking device for stacking recording media on a bottom plate after recording is finished and to be discharged from the apparatus main body in such a recording device.

K Toritsu Technical Superintendent Some of this type of paper stacking devices are designed to increase the distance from the paper ejection position between the pair of paper ejection rollers 1 to the bottom 3a of the paper ejection frame 3, as shown in FIG. 9, for example. By doing so, there is a structure in which a large number of recorded recording media 4 of 500 or more sheets are stacked at one time. However, in such a configuration, in the initial stage of stacking, there is a large drop between the paper ejection position and the bottom 38, so the recording medium 4 falls, for example, in the direction of arrow A, as shown in FIG. 10, causing positional deviation. As a result, all the recording media 5 could not be stacked in an orderly manner, resulting in a problem of so-called poor alignment.

Therefore, among the conventional paper stacking devices, as shown in FIG. There is a structure that is rotatable and supported by a compression spring 7 (Utility Model Publication No. 56-10751
(see publication).

In the second one, as shown in FIG. 12, a bottom plate 5 is provided within the paper ejection frame 3 and supported by a plurality of compression springs 8.
There is also a structure in which the bottom plate 5 is guided by a guide 9 provided on the paper discharge frame 1 so that it can be raised and lowered in the vertical direction (see Japanese Utility Model Publication No. 2-31262). Furthermore, as a third type, although not shown, there is a configuration in which a sensor detects the uppermost recording medium and a motor is driven based on the detection to lower the bottom plate.

In the above-mentioned first to third conventional paper stacking devices, the distance Q from the paper discharge position to the bottom plate 5 is reduced to reduce the head at the initial stage of stacking and prevent the recording medium 4 from misaligning. By lowering the bottom plate 5 according to the loading amount and always keeping the distance Ω constant, it was possible to stack all the recording media in an orderly manner, thereby maintaining good alignment.

However, in this type of conventional stacking device,
In the first and second types, for example, when the bottom plate 5 is damaged, the user cannot easily replace it, and has to request a service person to repair it one by one, which is inconvenient. Also, the third
However, since they require sensors and motors, they have the problem of increasing costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the inconvenience of not being able to easily replace the paper when it is damaged, and to provide a discharged paper stacking device at low cost without requiring a sensor or a motor.

In order to achieve the above object, the invention as claimed in claim 1,
In the paper discharge stacking device of the recording apparatus, the bottom plate is rotatably supported within the paper discharge frame by an elastic member, and a recorded recording medium is discharged onto the bottom plate, and the bottom plate is lowered according to the loaded amount. The present invention is characterized in that a bottom plate is detachably attached to the paper ejection frame.

Further, the invention according to claim 2 provides a discharge stacking device for a recording apparatus according to claim 1, wherein one of the bottom plate and the paper discharge frame has a rotation center axis, and the other has a rotation center axis. A bearing is provided, and a flat portion is provided on the outer periphery of the rotation center shaft, and the rotation center shaft is connected to a shaft hole into which the rotation center shaft is rotatably fitted, and the rotation center shaft is connected to the shaft hole and is connected to the shaft hole, and the rotation center shaft is provided with a flat surface on the outer periphery of the rotation center shaft. The bearing is characterized in that the bearing is provided with an attachment/detachment groove that allows the dynamic center shaft to come out of the shaft hole.

Furthermore, the invention according to claim 3 is characterized in that in the discharged paper stacking device of the recording apparatus according to claim 1, the elastic member is a leaf spring.

Furthermore, the invention as set forth in claim 4 is characterized in that, in the discharged sheet stacking device of the recording apparatus as set forth in claim 1, a finger hook portion or a knob portion for attachment and detachment is formed on the bottom plate.

Run--1 In the invention according to claim 1, for example, when the bottom plate is damaged, the bottom plate is replaced.

Further, in the invention as set forth in claim 2, when the bottom plate is damaged, for example, the bottom plate is rotated about the central axis of rotation within the sheet discharge frame and moved to the attachment/detachment position.

Then, the rotation center shaft is removed from the shaft hole through the attachment/detachment groove, and the bottom plate is replaced.

Furthermore, in the invention as set forth in claim 3, the bottom plate is lowered by deforming the leaf spring according to the load amount.

Furthermore, in the invention set forth in claim 4, when replacing the bottom plate, the bottom plate is taken out by hooking the finger on the finger hook or the knob.

1-1- Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 8 shows an overall schematic configuration of a laser printer, which is an example of a recording device, and is equipped with a discharged sheet stacking device of the present invention.

Reference numeral 10 in the figure is the main body of the apparatus, which is placed on an optional dedicated table 11. Inside the device main body 10,
A drum-shaped image carrier (photoreceptor) 12 that rotates clockwise in the figure is provided at the center. Around the image carrier 12, a charging means 13, an optical writing means 14, a developing means 15, a transfer means 16, and a cleaning means 17, which are electronic processing means, are arranged in order in the rotational direction.

On the other hand, on the right side of the apparatus main body 10 in the figure, paper feed cassettes 18 are removably loaded in the upper and lower directions. and,
A paper feeding device 22 having paper feeding rollers 19, a paper guide 20, a pair of registration rollers 21, 21, etc. is provided at the mounting portion of these paper feeding cassettes 18, 18. On the other hand,
On the opposite side of the paper feeding device 22 across the transfer means 16 described above.

The conveying device 23, fixing device 24, switching device 25, etc. are arranged in this order.

A face-down paper discharge path 26, a face-up paper discharge path 27, and a double-sided recording paper discharge path 28 extend separately from the switching device 25. The face-down paper ejection path 26 includes a pair of paper ejection rollers 2.
9 leads to a discharge stacking device 31 according to the present invention. The face-up paper discharge path 27 is connected to the main body 10 of the apparatus.
It leads to a face-up tray 32 which is provided on the side of the tray so as to be openable and closable. The double-sided recording paper path 28 leads to the dedicated table 11.

By the way, the dedicated table 11 is provided with a paper reversing device 33 in communication with the above-mentioned double-sided recording paper discharge path 28, and
A paper refeeding device 34 is provided which connects the paper reversing device 33 to the paper feeding device 22 of the apparatus main body 10 described above. Also,
A large quantity paper feed cassette 35 is removably loaded on the right side of the dedicated table 11 in the figure. A large quantity paper feeding device 37 having a paper feeding roller 36 and the like is provided at the mounting portion of the large quantity paper feeding cassette 35.

However, when operating the laser printer now,
The paper feed roller 19 or the paper feed roller 36 is appropriately selected and driven to sequentially feed out the recording medium 38 from the cassettes 18 and 35.

On the other hand, the image carrier 12 sequentially charges its surface with a charging means 13 while rotating clockwise in the figure, and then irradiates a laser beam with an optical writing means 14 to form an electrostatic latent image on its surface. Then, as the electrostatic latent image passes through the developing means 15, the electrostatic latent image is sequentially visualized. Then, the above-mentioned registration rollers 21, 21 are driven by aligning the image with the resist, and the above-mentioned recording medium 38, which had been abutted against the registration rollers 21, 21, is driven.
is sent out toward the image carrier 12. The image on the image carrier 12 is transferred to the recording medium 3 by the transfer means 16.
Transfer to 8. After the transfer, the surface of the image carrier 12 is cleaned by a cleaning means 17.

On the other hand, the recording medium 38 is sent to the fixing device 24 by the conveyance device 23, and the image transferred thereto is fixed by the fixing device 24. When a large amount of recording media 38 is to be discharged, or when it is desired to stack them in page order, the discharge stacking device according to the present invention can be used through the face-down paper discharge path 26! ! Send it to 31. Also, if the recording medium 38 is a thick paper such as a postcard, a switching bag is used! 25 to switch the ejection direction and feed the sheet through the face-up ejection path 27.
It is stacked face-up on the open face-up tray 32 as it is. Furthermore, if you wish to record on the back side as well, switch the ejection direction using the switching device 25, transport the paper through the double-sided recording ejection path 28, and place it on the dedicated table 1.
1 paper and transfer! [Leads to 33. Then, the sheet is reversed and conveyed again to the sheet feeding device 22 of the apparatus main body 10 through the sheet re-feeding device i34, and is again stopped by hitting the registration roller 21. Then, it is recorded on the back side in the same way and is discharged onto the discharge stack device 31 or face-up tray 32 according to the present invention.

Now, in the above-mentioned laser printer, the discharge stacking device 31 according to the present invention is specifically shown in FIGS.
Configure as shown in the figure. Reference numeral 40 in the figure is a paper ejection frame. The paper ejection frame 40 has a bottom portion 41 formed as an inclined surface that gradually becomes deeper as it approaches the paper ejection roller pair 29 side.

On the right side of the paper ejection frame 40 in the figure, a recess 42 is provided in the center, and a plurality of ribs 43 are provided in parallel on both sides of the recess 42. A support plate 44 is bonded to the recess 42 . The support plate 44 has a stopper 46 bent downward at one end and engages with one end edge of the paper discharge frame 4o. Further, the recessed portions 4 are provided on both sides of the central portion of the support plate 44.
2, a pair of bearings 45 are raised upward. The bearing 4
5 is formed with a shaft hole 47 and an attachment/detachment groove 48 communicating therewith. The attachment/detachment groove 48 is narrower in width than the diameter of the shaft hole 47;
The shaft hole 47 opens upward in the radial direction. A rotation center shaft 51 of the bottom plate 50 is rotatably attached to the shaft hole 47 of the bearing 45 . The bottom plate 5o is made of a synthetic resin plate, and has a plurality of ribs 52 on its upper surface, similar to the ribs 43 of the paper ejection frame 40.
and is divided into a horizontal part 54 and an inclined part 55 by a chevron-shaped bent part 53 at the center.

The horizontal portion 54 of the bottom plate 50 has a connecting portion 5 at the center of its end.
Charge 6 outward. On both sides of the connecting portion 56, the rotation center shaft 51 projects outward. The rotation center shafts 51 include a flat portion 51a on the outer periphery. On the lower surface of the horizontal portion 54, plate springs 57 are arranged on both sides of the rotation center shaft 51. Those leaf springs 57 are
One end 57a of each is screwed or glued, while the other end 57c is elastically pressed against the bottom portion 41 via the bent portion 57b. Then, the horizontal portion 54 is held in a horizontal state, and a distance Ω is formed between the end of the inclined portion 55 and the pair of paper discharge rollers 29, thereby reducing the drop of the recording medium 38.

A finger hook portion 5 is provided on the end side of the inclined portion 55 by notching itself.
8 will be provided.

When the recorded recording medium 38 is discharged from the paper discharge position onto the bottom plate 50 through the pair of paper discharge rollers 29, the recording medium 38 is neatly stacked without any positional deviation since the head is small even at the initial stage of stacking. The plate spring 57 is deformed according to the stacked load and rotated around the rotation center axis 51 to lower the bottom plate 50 and remove the uppermost recording medium 3.
The stacking is continued while keeping the height h between the paper sheet 8 and the pair of paper discharge rollers 29 constant. Then, in the final step, as shown in FIG. 4, the leaf spring 57 is bent, the bottom plate 50 is brought into close contact with the bottom part 41, and a large amount of recording media 38 is neatly aligned and stacked.

On the other hand, over time, for example, when the bottom plate 50 is damaged, the finger hook 58 should be hooked to the bottom plate 5o, and the rotation center axis 51
It rotates in the direction of the arrow as shown in FIG.
1a is parallel to the attachment/detachment groove 48. Then, move the flat part 51a in the convex direction of the arrow along the attachment/detachment groove 48, pull out the rotation center shaft 51 from the shaft hole 47, and remove the damaged bottom plate 5.
0 from the bearing 45, and replace it by attaching a new bottom plate to the bearing 45 in the opposite direction to the direction of the arrow C and the arrow opening.

In addition, in the above-mentioned embodiment, the bearing 4 is attached to the paper ejection frame 4°.
5 is provided, and the rotation center shaft 51 is provided on the bottom plate 50, but in this invention, although not shown in the drawings, contrary to the above,
The paper discharge frame 40 may be provided with a rotation center axis, and the bottom plate 50 may be provided with a bearing.

Further, in the embodiment described above, the finger hook portion 58 for attaching and detaching the bottom plate 50 is provided by cutting it out. However, in this invention, as shown in FIG.
0 may be provided, or as shown in FIG. 7, a convex portion may be formed on the bottom plate 5o and a knob portion 61 may be provided.

From the above, according to the paper discharge stacking device according to the invention set forth in claim 1, the bottom plate is detachably attached to the paper discharge frame, so that, for example, if the bottom plate is damaged, a service person can It is possible for the user to easily replace the device without having to rely on other devices, thereby reducing service costs. Furthermore, since it does not use sensors or motors, it can be provided at low cost. Furthermore, even if the main body of the device does not include a bottom plate, it can be provided as an option according to the wishes of users who place importance on uniformity.

Further, according to the stray paper stacking device according to the invention described in claim 2, since the rotation center shaft can be extracted only at the attachment/detachment position of the bottom plate, the bottom plate can be reliably attached/detached at the attachment/detachment position, and the rotation center shaft can be removed from the attachment/detachment position. Otherwise, it is possible to prevent the rotation center shaft from accidentally slipping out.

Further, according to the discharged paper stacking device according to the third aspect of the invention, since the plate spring is deformed to lower the bottom plate, buckling can be eliminated and the amount of stacking can be increased.

Furthermore, according to the discharged sheet stacking device according to the fourth aspect of the present invention, the bottom plate is attached and detached via the finger hook portion and the knob portion, so that the attachment and detachment operations thereof are facilitated.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a discharge stacking device which is an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an exploded perspective view thereof, and Fig. 4 explains the stacking state at the final stage. FIG. 5 is an explanatory diagram for replacing a damaged bottom plate, FIGS. 6 and 7 are other embodiments of the present invention, FIG. 6 is a plan view of the bottom plate, and FIG. 7 is a diagram of the bottom plate. A partial perspective view, FIG. 8, is a schematic diagram of the entire internal mechanism of a laser printer equipped with the discharge stacking device of the present invention. 9 to 11 are conventional examples, FIG. 9 is a schematic configuration diagram thereof, FIG. 10 is an explanatory diagram illustrating that the recording medium misaligns in the initial stage of stacking, and FIGS. 11 and 12 2A and 2B each show a schematic configuration diagram of a discharged paper stacking device that prevents misalignment. 31.......Discharge stacking device, 40...
・・・・・・Paper output frame, 45・・・・・・Bearing, 47・・・・・・Shaft hole, 48・・・・・・・・・
...Attachment/removal groove, 50...Bottom plate, 51...
...Rotation center axis, 51...Flat part, 57...Plate spring (elastic member), 58
・60...Finger rest, 61...
... Picking part.

Claims (1)

[Scope of Claims] 1. A recording device in which a bottom plate is rotatable within a paper discharge frame and supported by an elastic member, and a recorded recording medium is discharged onto the bottom plate, and the bottom plate is lowered according to the loaded amount. A discharged sheet stacking device for a recording apparatus, wherein the bottom plate is detachably attached to the sheet discharged frame. 2. A rotation center shaft is provided on one of the bottom plate and the paper ejection frame, a bearing for the rotation center shaft is provided on the other, and a flat portion is provided on the outer periphery of the rotation center shaft; Claim: wherein the bearing is provided with a shaft hole into which the shaft is rotatably fitted, and an attachment/detachment groove that communicates with the shaft hole and allows the rotation center shaft to come out of the shaft hole only when the bottom plate is in the attachment/detachment position. 1. A discharged paper stacking device of the recording apparatus according to 1. 3. The discharge stacking device for a recording apparatus according to claim 1, wherein the elastic member is a leaf spring. 4. The ejected sheet stacking device for a recording apparatus according to claim 1, wherein the bottom plate is provided with a finger hook or a knob for attachment and detachment.