JPS6031463A - Sheet discharging apparatus - 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 The present invention relates to a sheet discharging device, particularly a sheet discharging device that discharges sheets such as copy paper or printed paper recording paper from an image forming apparatus such as a copying machine, a printing machine, or a recording device onto a discharging tray. Regarding.

Conventionally, as shown in FIG. 1, this type of sheet discharging device has a discharge tray 3 installed downwardly or horizontally at the sheet discharging port 2 of an image forming apparatus 1. In the figure, 4 indicates the sheet discharging port 2. 5 is a guide plate, 6 is a sheet alignment blade plate rotationally driven by a motor 7, and a group of feeding rollers provided in the tray 3.
The sheets 9 discharged upward are drawn to one corner formed by the side plate 3a of the tray and the guide plate 5, and stacked in order. In this case, the tray 3 is arranged so as to be tilted forward and backward and left and right so that the sheet aligning blades can fully perform the aligning function. However, the sheet discharging device having the configuration shown in FIG. 1 has the disadvantage that the sheet size that can be used is limited or that the guide plate 5 must be moved in the direction of the arrow to change its position. there were.

Therefore, in order to improve the above-mentioned drawbacks, the ejection tray 8 is tilted upward (so that the image forming apparatus side is lower) as shown in FIG. 2, and this inclination angle θ is 1.
The angle is between 55° and 30°. ), but as the speed of the image forming device 161 increases and the sheet ejection speed becomes faster, the distance of the sheet 9 flying out from the feeding roller 4 increases. The interval will also be shorter. Therefore, before the sheet 9 ejected onto the ejection tray 8 moves in the direction of the arrow and returns to the position where it abuts the guide plate 5 below the tray, the next sheet is ejected, causing two or more sheets to overlap, or during the return process. There is an inconvenience that it may become slanted. Therefore, a flexible overlapping member 10 is provided to prevent the sheets P from flying out, but this has the disadvantage that it becomes difficult to align the sheets on the discharge tray.

The object of the present invention is to provide a sheet discharging device that eliminates the drawbacks of the conventional devices, and in a sheet discharging device that discharges sheets from an image forming apparatus to a discharging tray, sorting is performed on the discharging tray. The sheet feeding speed of the final feeding means for discharging the sheets is configured to be slower than the sheet feeding speed within the image forming apparatus, and the sheet feeding speed of the final feeding means is set to be lower than the sheet feeding speed of the final feeding means. The feeding means immediately before the feeding means is slowed down immediately after the trailing edge of the sheet passes through the feeding means, so that the final feeding speed of the sheet is made slower than the feeding speed within the image forming apparatus. .

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a side view showing the first embodiment of the present invention, in which the same parts as in FIGS. 1 and 2 are given the same reference numerals, and FIG. 4 is a plan view thereof. In FIGS. 3 and 4, a sheet sensor 12 such as a photoelectric switch or a microswitch is arranged in the sheet feeding path between the fixing roller 11 and the final feeding roller 4, and the output signal from this sheet sensor 12 is used to determine the final Feeding roller 4
This is a configuration for controlling the rotational speed of the drive motor 13.

FIG. 5 shows an example of this control circuit, in which 14 is a mono-multivibrator which is turned on for a certain distance τ when receiving the output signal shown in FIG. 6 from the seat sensor 12, and 15 is a mono-multivibrator 14. This is a circuit switching device that switches the high voltage supply circuit 16 to the low voltage supply circuit 17 for the drive motor 13 while receiving an output signal from the drive motor 13. DI-
D3 is a diode, G is a gear attached to the motor shaft,
It meshes with gear G2 on the final feed roller shaft as shown in FIG. A sheet aligning roller 25 having the same mechanism as the sheet aligning blade 6 is attached by a rotating shaft 25a between arms 27 protruding from a base 26, and the rotating shaft 25a and the base 26
A power transmission member 29 such as a belt or a gear is provided between the output shaft 28a of the motor 28 and the output shaft 28a of the motor 28, which is supported through the shaft. Due to the rotation of this sheet alignment roller 25, the tray 8
The sheets 9 ejected to the side plate 8a and rear plate 8b of the tray 8
Load the items in sequence by pulling them to one corner formed by the .

The first embodiment of the present invention has the above-described configuration, and the rear end of the sheet 9 that has passed the fixing roller 11 is connected to the sheet sensor 1.
2, the circuit switch 15 is switched to the low voltage supply circuit 17 as shown by the two-dot chain line using the output signal of the monomultipipe rake 14 activated in response to this detection signal. By this switching, a low voltage VL is applied to the drive motor 13, the rotational speed of the drive motor is reduced, and the final speed of the sheet 9 delivered onto the discharge tray 8 is reduced. The switching time τ is determined by the mono multivibrator 14.

FIG. 7 is a side view showing a second embodiment of the present invention, in which the same parts as in FIG. 3 are given the same reference numerals. Circumferential speed v2
The relationship between V and >V2 is established, and the sheet sensor 12 detects that the rear end of the sheet 9 passes through the fixing roller 11, and the solenoid 18 is controlled by this detection signal. The swing lever 19 has its middle part attached to a fixed part (not shown) so as to be able to swing freely around a shaft 19a, and the plunger 18a of the solenoid 18 is attached to one end of the pivot lever 19, and the plunger 18a of the solenoid 18 is attached to the other end, and the roller 20 is supported pivotably. When the solenoid 18 is energized and the plunger 18a is attracted and pulled in, the swinging lever 19 tilts as shown by the chain line to bring the abutting roller 20 into contact with the final feeding roller 4, and the sheet is fed. This configuration slows down the feeding speed of No. 9. A guide plate 24 forms a sheet conveyance path between the fixing roller 11 and the final feeding roller 4.

In this case, if a certain degree of sheet slack (loop) can be tolerated between the fixing roller 11 and the final feeding roller 4, a sheet sensor 21 is disposed in front of the fixing roller 11, and the sheet sensor detects the sheet. It is also possible to replace the sensor 12.

In FIG. 8, a sorting and aligning device 23 equipped with a feeding roller 22 is provided, and a sheet sensor 12 is installed immediately after the final feeding roller 4.
It is a side view which shows the 3rd Example of this invention which arrange|positioned. In FIG. 7, the peripheral speed of the fixing roller 11 is V3. The circumferential speed of the final feed roller 4 is v4, the high-speed side circumferential speed of the feed roller 22 in the sheet aligning device 23 is VS), the low-speed side circumferential speed of the feed roller is Vs L, @the feed roller 4 is fed from the beginning to the end. The distance to the feed roller 22 is 5L2. Let the distance from the sheet sensor 12 to the feeding roller 22 be JL+. Here, V
, = 1.03 V3 approximately, V'5 H=1.03V
1, so it is assumed that V5H=V,=V3. Further, the distance between the sheets passing through the image forming apparatus is assumed to be intersection 3. The moment the trailing edge of the sheet passes the position of the sheet sensor S, the conveying speed of the feeding roller 22 is set to VS H+V.
If the sheet is dropped onto the S L, it will take a while before the sheet is ejected from the feed roller 22.

/VS L [sec], during which the next sheet (see,
/V5 L)XV5) Advance by 1. Therefore, the distance between the front and rear seats is shortened by xl (vsH/v, L-1).

That is, the sheet spacing is Sentence, - Sentence, (V, H/V5L-1)
Therefore, it is good if this value is positive. Generally, the circumferential velocity V5H of distance viewing 3 is determined by the image forming apparatus, so if either the distance II statement or the circumferential velocity 5L is determined, the other is also determined. However, distance sentences are often determined by placement issues, so in the end, V! , +4>VS L>VS H/ (1+13/l
The circumferential speed V5L should be selected so that Distance #sentence.

By shortening , the circumferential speed vsL can also be made smaller.

This condition also applies to the embodiments described above.

As described in detail above, according to the present invention, the final feeding speed of the sheet is made slower than the feeding speed within the image forming apparatus. Therefore, sheets can be accurately and sequentially ejected to predetermined positions on the ejection tray, regardless of whether the image forming apparatus is a low-speed machine or a high-speed machine, without changing the inclination angle, shape, etc. of the sort ejection tray. can.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional sheet discharging device, Fig. 2 is a side view showing another example, Fig. 3 is a side view showing a first embodiment of the sorting and discharging device of the present invention, and No. 412 is a plan view thereof. , 5th
The figure is a control circuit diagram of the drive motor provided in the device, Figure 6 is a voltage waveform diagram applied to the drive motor, Figures 7 and 8 are
The figure shows the second sheet discharging device of the present invention. FIG. 7 is a side view showing a third embodiment. 1 is an image forming device, 3.8 is a discharge tray, 4 is a fork feed roller, 9 is a sheet, 12.21 is a sheet sensor, 13
is the drive motor. Figure 3 J Figure 2 Figure 7 Figure 8 Figure 5 Figure 6

Claims (1)

[Claims] (1) In a sheet ejecting device that ejects sheets from an id image forming apparatus onto an ejecting tray, the feeding speed of the final feeding means for ejecting the sheet onto the ejecting tray is determined by adjusting the feeding speed of the sheet within the image forming apparatus. The sheet feeding speed by the final feeding means is temporarily slowed down after the rear end of the sheet passes through the feeding means immediately before the final feeding means, so that the sheet feeding speed can be made slower than the sheet feeding speed. The final feeding speed is made slower than the feeding speed within the image forming apparatus. A sheet discharging device characterized by being configured as follows.