JPS6021057A - Copying device - Google Patents

Abstract

PURPOSE:To inhibit the idle rotation of a heat roller by connecting the normally closed contact of a subdoor switch to the normally opened contact of a main door switche in parallel, and even if an electric power supply circuit is disconnected by opening the main door, connecting the power supply circuit by opening the subdoor. CONSTITUTION:The normally opened contacts of the main door switches SW2, SW3 to be actuated on the basis of the opening/closing of the main doors 2, 3 fitted to the body of the titled device are connected to the power supply circuit. The subdoor covering an adjusting board providing an operation switching means is made to operate while the main door is opened. The normally closed contact of the subdoor switch to be actuated on the basis of the opening/closing of the subdoor is connected to the normally opened contact of the main door switch SW3 in parallel. Consequently, the main doors are opened, and even if the power supply circuit is disconnected, the power supply circuit is connected by opening the subdoor. Therefore, it is unnecessary for a service man to carry tools to be exclusively used for the connection of power supply. In addition, the idle rotation of the heat roller is inhibited to secure the safeness of the service man.

Description

TECHNICAL FIELD The present invention relates to a copying machine, and more particularly to a copying machine equipped with a safety device based on opening and closing of a main door.

Conventional technology In the past, users of copying machines often opened the main door to remove paper jams, etc., and to ensure safety when the main door was opened, a main door switch was installed to detect whether the main door was opened or closed. When the main door is opened, the power is cut off so that the load is not energized.

On the other hand, when service personnel inspect the operation of the copying machine or make adjustments by switching various function switches, they do so with the main door open, so they turn on the main door switch and turn on the power. Must be.

Therefore, a special jig is used to hold the main door switch in the on state, but this requires a special jig and simply controls turning the power on and off. For example, if you turn on the main door switch after opening the main door, the temperature of the fixing heater will reach the specified temperature. There is a problem with the machine starting to idle (preliminary rotation), putting service personnel at risk.

Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks.The purpose of the present invention is to provide an auxiliary door covering an adjustment board equipped with means for switching the operating state, etc., when a serviceman inspects the operation of the device. Focusing on opening the main door, the power is cut off when the main door is opened, but when the sub door is opened, the power is turned on.
To provide a copying apparatus that does not require a special jig for power supply and also enables control to avoid problems such as unexpected idle rotation of a heat roller or the like.

In order to achieve the purpose beyond the gist of the invention, the copying apparatus according to the present invention has the following features:
The normally open contact of the main door switch, which operates based on the opening and closing of the main door of the device body, is interposed in the power supply circuit, and the sub door covering the adjustment board, which is equipped with means for switching the operating state, can be opened and closed only when the main door is opened. The normally-closed contact of the sub-door switch, which operates based on the opening/closing of the sub-door, is connected in parallel with the normally-open contact of the main door switch.

The dog anatomy drawing shows one embodiment of the copying apparatus according to the present invention, and as shown in Fig. 1, there is a main door (
2) and (3) are installed so that they can be opened and closed, and the inner frame (5
) Main door switch (SW2) installed in the main door switch (SW2).

(SW3) operates based on the opening and closing of the main doors (2) and (3). The sub door (4) has hinged metal fittings (
6), which is a so-called blind plate for the adjustment board (7), and can only be opened and closed by service personnel. Various function switches (not shown) are installed on this adjustment board (7), and an auxiliary door switch (
SW4) is installed, and the sub door switch (SW4) is installed on the sub door (SW4).
4) It operates based on opening and closing.

Additionally, the secondary door (4) can only be opened when the main door (2) is opened, but when it is open, it is held in a nearly horizontal position as shown in Figure 2, and if it remains as it is, the main door door (2)
The structure is such that the main door (2) cannot be closed due to collision with the main door (2).

Note that the internal structure of the copying apparatus and its copying process are well known and will not be described here.

Figure 3 shows the power supply circuit, and when a voltage is applied between terminals (L) and (N), a transformer (TR), a aftermath rectifier (RF
) to the power unit) (1) U2) terminal (B) -
DC5V is output between (G). This output is used as a power source for driving the microcomputer and its control circuit 1i. The main switch (SWI) is connected in series with the relay (RYl), and the main door switch (sw2), (sw
The normally open contact of 3) is connected in series with the main switch (SWI) and relay (RY2). The normally closed contact of the above sub-door switch (SW4) is the main door switch (SW2), (S
It is connected in parallel with the normally open contact of W3).

On the other hand, a relay (RY2) is connected to the input terminals (L)-(N).
DC loads such as the power unit (PUI) and main motor (M) are connected through the normally open contacts (2aI) and (2a2) of the power unit (PUI), and terminals (C) to (G) of the power unit (PUI)
) When open, 24V DC is applied.

In the above power supply circuit, when the main door (2L (3) and sub door (4) are closed, the normally open contacts of the main door switches (SW2) and (SW3) are turned on, and the normally open contacts of the sub door switch (SW4) are closed. The closed contact is off.

To start copying, when the main switch (SWl) is turned on, the relay (RYI) operates and the self-holding contact (
1a) is turned on, and from then on, RYI (RYI) is self-maintained. At the same time, since the main door switches (SW2) and (SW3) are on, the relay (RY2) also operates, and its normally open contacts (2a1) and (2a2) are turned on, causing the power unit (PtJl) and main motor ( M) is energized.

Here, when the main doors (2) and (3) are opened, the normally open contacts of the main door switches (SW2) and (SW3) turn off [the normally closed contact of the sub door switch (SW4) is OFF 1, and the relay (R
Y2) returns and its normally open contacts (2a1) and (2a2)
turns off, power unit (PUI), main motor (
Cut off the power to M).

Normally, tasks such as paper jams that the user performs are performed in this state. When service personnel are inspecting or making adjustments, the secondary door (
4) When opened, the normally closed contact of the sub door switch (SW4) turns on, even though the main doors (2) and (3) are open.
The relay (R'l'2) operates and its normally open contact (2a1)
, (2a2) turns on, power unin) (PUI),
The main motor (M) is energized again.

Therefore, the service person can operate the copying machine and perform various inspections and adjustments with the main doors (2) and (3) open, as in the normal mode. In addition, the contacts of the auxiliary door switch (SW4) are connected to the input section of the microcomputer, and by its on/off operation, for example, when the auxiliary door (4) is opened, the auxiliary door switch (SW 4.) is activated. By turning on the normally closed contact, idle rotation control of the heat roller before the temperature adjustment weight of the fixing device is completed is canceled. This prevents the heater from rising in temperature during adjustment and suddenly entering idle rotation, which could pose a danger to the service personnel working on the heater.

FIG. 4 is a flowchart showing the above operation, in which it is determined in step (IS) whether or not the main door has been opened, and in step (2s) it is determined whether or not the sub-door has been opened. If both are rYEsJ, the power supply circuit is turned on in step (3s), and idle rotation of the heat roller is prohibited in step (4s). Even if step (1s) is YESJ, if step (2s) is lN0J, step (
In step (5s), the power supply circuit is turned off, and in step (6s), the heat roller is allowed to rotate idly. Step (1s) is rN
If it is OJ, this routine ends immediately.

Effects of the Invention As is clear from the above explanation, in the present invention, the sub door can be opened and closed only when the main door is opened, and the normally closed contact of the sub door switch is connected in parallel with the normally closed contact of the main door switch. Even if the power circuit is cut off when the main door is opened, the power circuit will be energized when the sub door is opened, so the service person does not need to carry around a jig specifically for energizing. However,
The contacts of the auxiliary door switch can be used for other controls, such as prohibiting idle rotation of the heat roller to ensure the safety of service personnel.

[Brief explanation of the drawing]

The drawings show an embodiment of the copying apparatus according to the present invention, in which FIG. 1 is a perspective view showing the external appearance, FIG. 2 is a perspective view of the sub-door portion, and FIG.
The figure is a power supply circuit diagram, and FIG. 4 is a flowchart. (2), (3)...Main door, (4)...Sub-door, (5)
...internal frame, (7) ...adjustment board, (SWl
)...Main switch, (SW2), (SW3),,
, Main door switch, (SW4)...Sub-door switch.

Claims (1)

[Claims] (1) The normally open contact of the main door switch that operates based on the opening and closing of the main door of the device Honjo is interposed in the power supply circuit, and the sub door that covers the adjustment board equipped with means for switching the operating state etc. is installed when the main door is opened. 2. A copying machine characterized in that a normally closed contact of a sub-door switch which is operable based on the opening/closing of this sub-door is connected in parallel with a normally-open contact of a main door switch.