JPS60257470A - Separation detector - Google Patents

Abstract

PURPOSE:To prevent a form from rushing to a cleaner part because of separation defect by providing a displacement detecting shaft interlocked with a separating claw. CONSTITUTION:A device consists essentially of a displacement detecting shaft 12 interlocked with the separating claw and a separation detector 13. Though the front end of the form is brought into contact with a separating claw 11 when the form 10 is attracted to a drum 1 because of separation defect, there are no problems if the form is separated from the drum 1; but if the form passes through the separating claw 11 by some influence while attracted to the drum, the displacement detecting shaft 12 interlocked with the separating claw by the thickness (t) of the form is moved for length t'. The separation detector 13 is provided in this position to which the shaft 12 is moved, and the displacement detecting shaft 12 and the displacement angle t' are set by combination. Though physical oscillation is generated when the front end of the form 10 is brought into contact with the separating claw 11, there are no problems if some time lag is given to a control circuit 14 though the signal from the separation detector 13 is inputted to the control circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a separation detection device for a copying machine, and more particularly to a device in which defective separation is detected by controlling the amount of displacement of a separation claw in contact with a photoreceptor.

A conventional copying machine has a basic configuration as shown in FIG. 1, and in particular, a method of electrostatic separation by providing a separation charger 6 is often adopted for separation. However, since it is not always possible to separate all paper types and usage environments, a separation claw 11 is provided as shown in FIG.

However, even with this separation claw 11, the separation claw 11 may
Since the leading edge of the paper 10 is in contact with the drum surface, there are problems such as the leading edge being scraped over time and becoming rounded. Even if the paper 10 that has been poorly separated comes into close contact with the drum 1 and hits the separating claw 11, it will remain in the cleaner 7. If the paper 10 gets stuck in the cleaner 7, it may cause image defects and it will take a long time.It is necessary to prevent the paper 10 from getting inside the cleaner 7.

In order to cover the above-mentioned conventional drawbacks, the present invention provides a paper 10
This makes it possible to carry out the necessary control at the time when the separation claw 11 hits the separation claw 11.

Structure of the Invention FIG. 6 shows an embodiment of the invention, and FIG. 4 shows its details. First, the basic structure of the present invention is a separation claw (() that is linked to a variable magnification detection shaft 12 and a separation detector 13. In other words, when the paper 10 has a separation failure and is attracted to the drum, the leading edge of the paper Even if it hits the separation claw 11, there is no problem if it moves away from the drum 1 as shown by the dotted line in Figure 4, but for some reason, when it passes through the separation claw 11 9 times while still adsorbed to the drum, the paper thickness Ct ) The variable magnification detection shaft 12 that is linked to the separation claw moves by (t').The separation detector 13 may be provided at this position.The displacement detection shaft 12 and the variable magnification angle (t') are Can be set by combination.

Also, when the leading edge of the paper 10 hits the separation claw 11, physical vibration may occur, but in response to this, there is a slight time lag even when the signal from the separation detector 13 is input to the control circuit 14. There is no problem if the control circuit is provided with this. Here, the means of the separation detector 13 may be a micro SW, a photocoupler, etc., but is not particularly limited, but here, an example using a Hall IC will be described with reference to FIGS. 5 to 7.

First, in FIG. 5, when a signal from the separation detector 16 is input to the control circuit 14, the drive motor 15 is stopped so that the paper 10 does not enter the cleaner part 7, and a display section 16 is displayed to notify the user of the reason. provide the necessary information.

In Fig. 6, when a paper 10 is caught between the drum 1 and the separating claw 11, the partial separating claw 11 is separated by a solenoid 18 so that the paper 10 does not damage the surface of the drum 1. . This also provides the advantage that the user can easily take out the paper 10 when processing it.

The operation of this solenoid may be unlocked by the user using a process release switch 22 as shown in FIG. The tension spring 19 is normally attached to the separation claw 11
This is for the tip of the drum to be brought into proper pressure contact with the surface of the drum 1.

FIG. 7 shows an example circuit of this embodiment. When the magnet 17 interlocked with the displacement detection shaft 12 approaches the Hall rc13, the Hall IC
The output turns on and transistor 20 becomes solenoid 18.
Turn on.

Here, the time lag capacitor 21 is for absorbing the signal when the leading edge of the paper 10 hits the leading edge of the separating claw 11, as described above.

Of course, this example circuit is not limited to this example.

As shown in FIG. 8, as an example, the paper is generally used to synchronize the image on the drum with the paper 10 using registration rollers, and also has the role of transporting the paper. In this example, the registration roller 23 is replaced by a registration motor 24 shown in FIG.
Therefore, when the amount of displacement is detected, the registration motor 24 is rotated in the opposite direction along with the above-mentioned operation to pull the paper away from the drum 1, which is the case when the user processes the paper. The reverse rotation time of this registration motor may be arbitrarily determined.

In other words, even if there is separation detection 9, when paper 10 is fed double, it is inevitable that the upper paper will be attracted to the surface of drum 1 and carried to the cleaner side.The present invention is also advantageous in this aspect. is what comes out.

As described in detail of the invention, the provision of the displacement detection shaft linked to the separation claw prevents the paper from entering a part of the cleaner due to poor separation.

[Brief explanation of the drawing]

1 and 2 are sectional views showing the conventional example, 6 and 4 are sectional views and partially enlarged sectional views showing the embodiment of the present invention, and 5 and 7 are control circuits. FIG. 6 is a sectional view showing another embodiment, and FIG. 8 is a sectional view showing another example. In the figure, 11 is a separating claw, and 14 is a control circuit.

Claims (1)

[Claims] A separating device that separates a sheet from a photoreceptor by bringing a movable separation claw into contact with the photoreceptor, the separation detection device comprising: detecting the amount of displacement of the separation claw; .