JPS62105863A - Paper discharging apparatus - Google Patents

Abstract

PURPOSE:To cut cost and reduce the number of parts of a means for detecting the position of a paper discharging roller by installing a photosensor and a light shielding body, in order to detect the position of the paper discharge roller. CONSTITUTION:After a copying paper passes through a paper discharge sensor, the I/O part (a) of a CPU 32 is turned ON to revolve a driving motor 24 so that a light shielding body 27 shifts leftward through a channel driver 34a. Then, also the upper and lower paper discharge rollers 16 and 18 shift leftward to discharge the copying paper leftward. When the light shielding body 27 reaches the left end of the operation stroke, the voltage at the X point is set close to the B point, and the I/O part (a) is turned-OFF, and the revolution of the driving motor 24 is suspended. Further, the I/O part (b) is turned-ON, and the upper and lower paper discharge rollers 16 and 18 are shifted rightward before the next copying paper is inserted into a paper discharge part, and when the light shielding body 27 reaches the right end of the operation stroke, the voltage at the X point is set close to the A point, and the I/O part (b) is turned- OFF to suspend the revolution of the driving motor 24.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a paper ejecting device that has a job separator and can sort ejected sheets, and more specifically, it is applicable to the paper ejecting section of printers, copying machines, and facsimile machines. This paper pertains to a dry paper ejecting device.

(Prior Art) In a conventional paper ejecting device, which is equipped with a paper ejecting means that can sort the ejected paper by moving the ejecting roller to the left and right, the paper ejecting device changes as the ejecting roller moves. The position of the paper ejection roller is detected by a photo sensor and a light shield provided on the movable paper ejection roller.

A more specific configuration of the above-mentioned detection means is that photosensors are arranged at one end and the other end of the operating stroke of the light shielding body, and it is determined whether the light shielding body blocks the optical path of these photosensors or not. The movement of the paper ejecting roller is controlled by detecting the position of the light shielding member during its operating stroke.

However, in the above-mentioned conventional AM, it is necessary to use two photosensors and a light shielding member as means for detecting the position of the paper ejection roller, which causes an increase in cost.

(Objective) It is an object of the present invention to provide a paper ejecting device that solves the problems of the prior art described above, reduces the number of parts for the position detection means of the paper ejecting roller, and reduces costs. .

(Structure) In order to achieve the above object, the present invention includes a paper ejection unit that moves a paper ejection roller to sort the ejected sheets, a photo sensor and a light shielding body that detect the position of the paper ejection roller. and a drive means for moving the paper ejecting roller based on a signal from the position detecting means. In some cases, the feature is that the amount of light shielding is different.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

FIG. 1 is a side view showing an outline of a copying machine to which the present invention can be applied, FIG. 2 is a front view showing a paper ejection means, FIG. 3 is a side view showing a position detection means, and FIG. 4 is a drive 1 and 5 are diagrams for explaining the control circuit, Figure 6 is a diagram for explaining the positional relationship between the photosensor and the light shield, and Figure 7 is a diagram for explaining the positional relationship between the photosensor and the light shield. FIG. 3 is a diagram showing the relationship between position and generated voltage.

In Fig. 1, a light source such as a laser (
an optical writing section 2 (not shown), an OPC belt 3 that receives a light beam, a charging section 3a, a developing section 4, a transfer section 5, a static eliminating section 6, and a cleaning section arranged around the OPC belt 3. 7, a fixing section 8, a paper discharge section 1o which is connected to the fixing section 8 via a guide plate 9, and a plurality of sets of paper feed cassettes 12 equipped with paper feeding means such as a paper feed roller 11. , a sequence for controlling the various members mentioned above, and a storage section 14 in which a printed circuit board 13 for a controller is arranged.

In the above apparatus, the controller converts data such as characters or graphics to be copied into video signals page by page, turns on and off the laser that is the light source, and exposes the OPC belt 3 charged by the charging section 3a. A latent image such as a character or graphic is created by the developer section 4, transferred to transfer paper of an appropriate size fed from the paper feed cassette 12, and fixed by the fixing section 8, after which it is ejected. The paper section 10 discharges the transfer paper onto a paper discharge tray 15 installed at the top of the main body 1 of the apparatus.

Next, the paper ejecting means constituting the paper ejecting section 10 will be specifically explained.

In FIG. 2, an upper roller shaft 17 provided with a plurality of upper paper ejection rollers 16 and a lower roller shaft 19 provided with a lower paper ejection roller 18 disposed opposite to the upper paper ejection rollers 16 have their axes aligned with each other. They are arranged parallel to each other, and the upper roller shaft 17
The ends of the lower roller shaft 19 and the lower roller shaft 19 are each supported by a frame 20 via bearings 21 so as to be laterally movable. Approximately at the center of the lower roller shaft 19, as shown in FIG.
A slide gear 22 that is fitted with appropriate means such as a part 20a of 0 and guided for movement is installed by a stopper 22a, and a worm gear 23, which is a part of the drive means that fits with this slide gear 22 and aB, is driven. Rotating shaft 2 of motor 24
4a. Then, by the forward and reverse rotation of the drive motor 24, the slide gear 22 is rotated through the worm gear 23.
By the lateral movement of the slide gear 22, the lower roller shaft 19 and the upper roller shaft 17 are moved laterally in FIG. 2. A sprocket 41 is provided at the right end of the lower roller shaft 19, and rotational force from a drive source (not shown) is transmitted to the lower roller shaft 19 via a hook link chain 42 provided on the sprocket 41.

A position detection means is provided at the left end portions of the upper roller shaft 17 and the lower roller shaft 19. That is, as shown in FIGS. 2 and 3, a disc-shaped regulation plate 25 is fixed to the left end of the lower roller shaft 19, and an interlocking mechanism 26 suspended from the upper roller shaft 17 is attached to this regulation ui 25. They are fitted so that both the upper roller shaft 17 and the lower roller shaft 19 move laterally. Further, a light shielding body 27 is suspended from the left end portion of the lower roller shaft 19. This light shielding body 27 has a first hanging leg part 27a at the left end when viewed from the front, and a horizontal part 27b is formed at the upper part of this first hanging leg part 27a, and furthermore, at the right end part of this horizontal part 27b, an upper part is formed. and an extending portion 27c extending downward and fixed to the lower roller shaft 19.

A second hanging foot part 27d is formed, and this second hanging foot part 27d is formed.
The hanging dimension of the hanging foot part 27d is made smaller than the first hanging foot part 27d. The above-mentioned 1° second hanging foot portion 27a
, 27d are arranged so as to be able to block the optical path between the photosensor 2 shown in FIG. 5, that is, the light emitting diode 29 and the phototransistor 30.

As shown in FIG. 5, the above-mentioned photosensor 28 is
It is electrically connected to the CPU 32 via a D converter 31. This CPU 32 is electrically connected to a program memory or a work memory 33, etc., and receives a signal from the photo sensor 28 to drive the drive motor 24 through a pair of channel drivers 34a and 34b.
Controls the rotation and direction of rotation. In addition, 35 in the figure is a resistor.

Therefore, when sorting the discharged transfer paper, turn on/off (Low/High
h) The drive motor 24 is rotated in an appropriate direction by the channel drivers 34a and 34b, and the worm gear 2
3 and the upper and lower roller shafts 17, 19 via the slide gear 22.
The transfer sheets can be separated from each other in a job by moving the transfer sheet in either the left or right direction and using the upper and lower paper discharge rollers 16 and 18 that move laterally as the paper moves.

By the way, in this embodiment, as shown in FIG. 6, the shape of the light shielding plate 27 that blocks the optical path of the photosensor 28 is made such that the lengths of the left and right hanging legs 27a and 27d are different. The light-emitting diode 29 of the photosensor 28 is on the left side and on the right side, that is, when it is on the operating end of the light shielding plate 27 and when it is on the other end. It is possible to make a difference in the shielding ML and t of the light emitted from the.

Specifically, in this embodiment, the first hanging foot 27a formed at the left end of the light shield 27 is longer than the second hanging foot 27d formed at the right end. At the right time, the photosensor 28 shown in FIG.
The difference in output is as shown in FIG. In other words, if the voltage at point X in FIG. 5 is near point A, it is determined that the light shield 27 is on the right, and if the voltage at point It will be possible.

Then, by converting the voltage at point X into a digital value such as 8 bytes by the A/D converter 31, the CPU 3
2, the position of the light shield 27 can be found.

Therefore, in the case of normal paper ejection, the upper and lower paper ejection rollers 16.
18 is stationary, and the light shielding body 27 is at the right position without moving. When performing job separation, after the transfer paper passes the paper discharge sensor 40, the I10 of the CPU 32
Turn on (High) part a and turn on channel driver 3.
The drive motor 24 is rotated so that the light shielding body 27 moves to the left via the light shielding member 4a. Then, the upper and lower paper ejection rollers 16,
18 also moves to the left and discharges the transfer paper to the left. When the light shield 27 reaches the left end of its operating stroke,
The voltage at the point X becomes close to the point B, which is determined by the CPU 32, and the
w) The rotation of the drive motor 24 that moves the light shielding body 27 is stopped.

Further, the 110 part of the CPU 32 is turned on (High), and the drive motor 2 is turned on so that the light shielding body 27 moves to the right.
Rotate 4. Then, the upper and lower discharge rollers 16 and 18 also move to the right and discharge the next transfer sheet to the right. When the light shielding body 27 reaches the right end of its operating stroke, the voltage at the point
) to stop the rotation of the drive motor 24.

By controlling the forward and reverse rotations of the drive motor 24 described above, the print sheets are successively separated into jobs by the upper and lower discharge rollers 16 and 18.

In this manner, in this embodiment, the position of the light shielding body 27 can be detected by one photosensor 28, so that the cost can be reduced compared to the conventional device which uses two photosensors. Also, in a 1-chip CPU,
Since the sections 110a and 110b and the A/D converter 31 are normally provided, the use of these circuits does not result in an increase in cost.

(Effects) The present invention is configured as described above, and only needs to use a light shield and one photosensor to detect the position of the paper ejection roller, and the number of parts can be reduced compared to conventional devices. It is possible to provide a paper ejecting device that can reduce costs.

[Brief explanation of drawings]

FIG. 1 is a side view showing an outline of a copying machine to which the present invention can be applied, FIG. 2 is a front view showing a paper ejection means, FIG. 3 is a side view showing a position detection means, and FIG. 4 is a drive A side view showing the means part, FIG. 5 is a diagram for explaining the control circuit, FIG. 6 is a diagram for explaining the positional relationship between the photosensor and the light shield, and FIG. 7 is a diagram for explaining the position of the light shield. FIG. 3 is a diagram showing the relationship between and generated voltage. 16.18... Paper discharge roller, 17.19... Roller shaft, 22.23.24... Drive means, 27... Light shielding body, 27a, 27b... Hanging foot portion, 28...・・rank W
Detection means, 29... light emitting diode, 30... phototransistor. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7

Claims (1)

[Claims] A paper ejecting means that moves the ejecting roller to sort the ejected sheets, a position detecting means consisting of a photo sensor and a light shield for detecting the position of the ejecting roller, and a signal from the position detecting means. and a drive means for moving the paper ejecting roller, the light shielding device is configured such that the amount of light shielding is different when the light shielding body is at one end of the operating stroke and when it is at the other end. Characteristic paper ejection device.