JPS61277547A - Method of detecting stacked condition of medium housing device - Google Patents

Abstract

PURPOSE:To detect the stacking condition on a receiving bed with high reliability by providing a rotation detector of an impeller shaft to detect variation in the rotation of an impeller due to friction between said impeller and a recording medium stacked on said receiving bed. CONSTITUTION:A sheet of paper 12 discharged from a recording device 2 is received by an impeller 9, and is reversed due to its rotation and housed and stacked on a received bed 13. The stacked sheets of paper 12 are not brought into contact with the vanes of the impeller 9, but, when the sheets of paper 12 have been stacked up to a certain height, the vanes of the impeller 9 comes to high the stacked sheets of paper 12, and the number of revolution of the motor 4 is reduced due to frictional load, enabling the stacked condition to be detected. That is, the number of revolution of the impeller 9 is detected by a rotation detector 6 and the out-put pulse is compared with a reference pulse, to detect whether the stacking condition is normal, stacker-full, or jammed. Further, if static electricity is generated on the paper 12 causing the paper 12 to be floated up on the receiving bed 13, when the stacked quantity is small, the quantity of variation in rotation as a frictional load is small, and the paper 12 can be securely stacked without being detected as a stacker-full condition.

Description

[Detailed Description of the Invention] [(Summary)] A medium storage device configured to reverse and store a recording medium ejected from a recording device using a reversing mechanism of an impeller so that the order is not reversed, In this method, a rotation detector is provided to detect the rotation speed of the impeller, and the rotational variation of the impeller is detected by the rotation detector, thereby detecting the stacking state of the stacker.

[Industrial application field]

The present invention relates to a medium accommodating device for a recording device, and a medium accommodating device that inverts the recording media ejected from the recording device and detects the stacked state of the recording media in which the first page is correctly arranged from -N on a cradle. The present invention relates to a method for detecting a deposition state of an apparatus.

Generally, a recording medium ejected from a recording device, etc., falls onto a holder (stacker) of a media storage device placed below the recording device and is stored with the image side of the recording medium (hereinafter referred to as paper) facing up. be done.

This method has the advantage of being able to monitor whether printing is proper or not, but it also results in a large number of successively printed sheets being stacked on the pedestal in reverse order.

Therefore, a reversing mechanism is provided to reverse the paper discharged from the recording apparatus, so that the pages are stacked on the tray in the correct order starting from the first page.

Since the amount of paper that can be stacked on the tray is limited, a detection mechanism is provided to detect when the stack is full. However, since paper reversal becomes unstable depending on the state of the paper, detection of the full stack becomes unstable and lacks reliability.Therefore, a simple and highly reliable detection method is desired.

[Conventional technology]

FIG. 4 shows a conventional medium storage device 1.
is a device connected to the recording device 2 and accommodating the ejected paper 12.

In the figure, the medium storage device 1 is equipped with an impeller 9 around a rotating shaft 3 for receiving paper 12 discharged from the recording device 2, and the rotating shaft 3 is connected to a bearing 7 via a bearing (not shown). A motor (not shown) inside the rotating shaft 3 is supported by a bearing 7 and rotates the rotating shaft 3 via a gear (not shown). Further, below the rotary shaft 3, there are provided a separation bellow 15 for separating the paper 12 from the impeller 9, and a pedestal 13 connected to the bearing 7 and on which the paper 12 is deposited.

When the paper 12 discharged from the recording device 2 is fed into the impeller 9, the rotation speed of the impeller 9 is smaller than the discharge speed of the paper 12, so the paper 12 gradually enters the impeller 9. Furthermore, as the impeller 9 rotates, the paper 1
2 is inverted and hits the separating bellows 15, thereby being separated from the impeller 9 and stored on the receiving table 13.

Since there is a limit to the amount of paper stacked on the pedestal 13, sensors 14 consisting of light-emitting and light-receiving elements are provided in the bearings 7 on both sides to detect the stacked state on the pedestal 13.

[Problem that the invention seeks to solve]

A conventional method for detecting the accumulation state of a medium storage device uses detection sensors (consisting of light emitting and light receiving elements) 14 provided on both bearings 7.
is detected because it is blocked by the paper 12 stacked on the pedestal 13, as shown in FIG.

The paper 12 discharged from the discharge roller 16 of the recording device 2 is received by the impeller 12, and the paper 12 is reversed by the impeller 9 and stored on the receiving table 13. In this process, paper 1
There is a problem in that static electricity is generated on the sheet 12 and the sheet 12 is lifted up on the tray 13 as shown in FIG.

Some types of fork paper tend to wrinkle a lot, and there is a problem in that even if the paper is bulky and has a small amount (half the normal amount), it is detected as full.

[Means for solving problems]

FIGS. 1(A), 1(B), and 1(C) are diagrams for explaining the present invention in detail.

As shown in FIG. 1(A), the present invention removes the detection sensor 14 that detects the full accumulation on the pedestal 13 of the conventional medium storage device shown in FIG. 2, and newly detects the rotation of the rotating shaft 3. A detector 6 is provided to detect the state of accumulation on the pedestal 13.

FIG. 1(A) shows the vicinity of the rotation detector, and as in the conventional case, the rotating shaft 3 is supported by the bearing 7 via the bearing 8, and the motor supported by the bearing 7 is inside the rotating shaft 3. There are 4. The motor 4 is decelerated through gears 5a, 5b, 5c, and 5d, and rotates the rotary shaft 3.A hole 10 is provided on the circumference of the disc to be detected by a sensor 11. It is configured so that the rotational speed of the rotating shaft 3 can be detected.

[Effect]

FIG. 1 <V> shows an initial state in which the paper 12 discharged from the recording device 2 is reversed by the impeller 9 and stored on the holder 13 of the stacker.

That is, the sheets 12 are piled up on the pedestal 13, and the amount of accumulated sheets increases, and the stacked sheets on the pedestal 13 change from the state shown in FIG. 1 <d> to the state shown in FIG. 1 (//). 12
When the impeller 9 becomes high, the rotation of the impeller 9 gradually slows down (and eventually stops) due to the frictional load between the stacked paper 12 and the impeller 9. The state of accumulation on the pedestal 13 is detected by detecting the rotational fluctuation of 3.

Further, even if static electricity is generated on the paper 12 and the paper 12 rises on the cradle 13 while the paper 12 discharged from the recording device 2 is reversed by the impeller 9 and stored on the cradle 13, , only due to the coefficient of friction between the paper 12 and the blades of the impeller 9, and the paper 12 is stacked in an orderly manner by the impeller 9.

〔Example〕

The present invention will be explained in detail using the rotation detector 6 shown in FIG.

The accumulation state detection method of the present invention removes the detection sensor 14 for detecting the full accumulation of the medium storage device shown in FIG. 4, and newly provides a rotation detector 6 as shown in FIG. It is designed to detect the state.

As described above with reference to FIG.
The rotary shaft 3 is rotated by deceleration via the rotary shaft 3.

In the present invention, a disc-shaped rotation detector 6 is provided inside the bearing 7 at the tip of the shaft 17 of the gear 5b. A hole 10 for detection by a sensor 11 is provided on the circumference of the disc so that the rotation of the rotating shaft 3 can be detected by detecting the liquid hole 10. It is configured to be driven by

The paper 12 discharged from the recording device 2 is received by the impeller 9, is turned over by the rotation of the impeller 9, and is accommodated and deposited on the receiving table 13.

FIG. 1(N) shows the initial stacking state, in which the stacked paper 12 and the blades of the impeller 9 do not come into contact with each other, but as the stacking of the paper 12 progresses, the stacking state as shown in FIG. 1(zA') is reached. Then,
The blades of the impeller 9 hit the accumulated paper 12, and the rotation of the motor 4 is reduced due to the frictional load, so that the accumulation state can be detected.

FIG. 2 is a diagram showing a detection circuit of the present invention, and FIG. 3 is a diagram showing a time chart of FIG. 2. .

For example, output pulses (360 pulses per revolution of the impeller) from the sensor 11 (A in Figure 2) that detects the rotation speed of the impeller 9, and the reference pulse generation circuit for rotation speed measurement (second
The pulses from (a) in the figure (which generates a gate pulse (waveform a in figure 3) corresponding to the output pulse of the normally rotating impeller 9 and 6 pulses) are sent to the AND circuit (o in figure 2). The state of the cradle 13 can be determined from the number of counter pulses (one in FIG. 3) obtained through the operation.

The circuit shown in FIG. 2 is a counter circuit that counts pulses from the AND circuit. If the number of counter pulses entering the counter circuit is N = 6, it is normal, but if it is 6〉N〉0, as shown in the waveform of Fig. 3, the impeller 9
The rotational speed of the engine has decreased, and it is determined that the stacker is in a full state.

If N=O as shown in waveform 2 in Figure 3, the impeller 9 is stopped, indicating an abnormality such as a paper jam.

Note that the counter measures pulses within a range separated by the reset circuit. The waveform of the seven-node circuit is the inverted signal of the reference pulse generation circuit. Also, A and A' shown in Figure 3
, A" indicates the output waveform from the sensor 11, B indicates the reference pulse waveform, and T, C, and T indicate the number of count pulses, respectively.

As described above, by detecting the rotation speed of the impeller 9 using the rotation detector 6 and comparing the output pulse with the rotation speed reference pulse, it is possible to determine whether the stacking condition on the pedestal 13 is normal, stacker full, or jammed. can be detected.

Furthermore, even if static electricity is generated on the paper 12 and the paper 12 rises on the holder 13, if the amount of accumulated paper 12 is small, it will only be a harsh friction between the paper 12 and the blades of the impeller 9, and rotation as a frictional load will occur. The amount of fluctuation is small and is not detected as full deposition.
The paper 12 is pressed and deposited securely.

〔Effect of the invention〕

As described above, according to the present invention, by detecting the rotation of the impeller using the rotation detector, the state of the piles deposited on the pedestal can be detected with high reliability.

FIG. 2 is a diagram showing a detection circuit of the present invention; FIG. 3 is a diagram showing a time chart of FIG. 2; FIG. 4 is a diagram explaining a conventional medium storage device; FIG. FIG.

In the figure, 1 is a medium storage device, 2 is a recording device, 3 is a rotating shaft, 4 is a motor, 5a, 5b, 5c, 5d are separate vehicles, 6 is a rotation detector, 7 is a bearing, 8 is a bearing, 9 is a bearing Impeller, 10 is hole, 11 is sensor, 12 is paper, 13 is pedestal, 15 is separating blade, 16 is discharge roller, (in
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Claims (1)

[Claims] An impeller (9) is arranged around an axis perpendicular to the moving direction of the recording medium at the discharge port of the recording medium, and the leading end of the recording medium (12) is inserted into the impeller (9). , axis rotation and recording medium (
12) A method for detecting the stacking state of a medium storage device in which recording media (12) are reversed by a feeding force and stored on a pedestal (13), the method comprising: a rotation detector for detecting rotation of the shaft; The recording medium (
12) A method for detecting the accumulation state of a medium storage device, characterized in that the accumulation state on the pedestal (13) is detected by detecting rotational fluctuations of the impeller (9) due to friction with the impeller (9).