JPS5855382Y2 - Paper jam removal device inside the fuser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that can easily remove jammed paper from a heating roller type fixing device of an electronic copying machine.

Conventionally, in order to remove jammed paper that was wrapped around a heating roller or pressure roller, one of the rollers had to be removed and removed, and the pressure mechanism between the heating roller and the pressure port made it easy to remove the jammed paper in the event of a paper jam. It was possible to release the press-contact state.

In the former case, it took a lot of effort and time to remove the rollers, and furthermore, after removing the paper, the two rollers had to be reinstalled into the fuser so that the pressure distribution was constant, which was troublesome. .

Moreover, in the latter case, a large amount of cost is required for the roller pressure contact mechanism.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to provide a paper jam removal device in the fuser that makes it easier to remove jammed paper from the heating roller area, where it is difficult to remove jammed paper. It is about providing.

Hereinafter, the present invention will be explained with reference to the drawings.

A in the drawing is a jam circuit.

In this jam circuit A, 1 is a print switch, 4 is a mark '1
In the circuit, 5 is a NOR gate, 6 is an OR gate, and 7 is a transistor that operates the relay 8.

8 is a relay that drives the main motor, and the main motor is connected in series with the normally open contact of this relay 8.

Reference numeral 9 denotes a transistor that operates the loop 10, and a relay 10 operates the motor 14 of the heating roller 13.As shown in FIG. Contains.

11 is a transistor that operates the jam indicator lamp 12;

A running capacitor 16 is incorporated in the motor circuit B of the heating roller 13.

The jam circuit A middle 2 is a signal to stop the machine, and is output when the machine (copying machine) is stopped (in the normal STP mode, after the paper inside the machine is completely discharged to the outside of the machine).

), and is low level when stopping the machine, and high level at other times.

3 is a jam signal, and when this jam signal changes from high level to low level, the machine comes to an emergency stop.

Note that the machine stop signal 2 and jam signal 3 are generated from the circuit shown in the figure.

Further, the transistor 1 and the relay 8 constitute a control means a for the main motor, and the OR gate, the transistor 9 and the relay 10 constitute a control means for the motor 14 of the heating roller 13, and the NOR game 5 and OR gate 6
This constitutes the control means C.

Next, the operation will be explained.

When the customer presses the print switch 1 to make a copy, the memory circuit 4 is set (at this time, the machine stop signal 2 and the jam signal 3 are at high level), and the output Q changes from high level to low level, so transistor 7.9 is turned on, relays 8 and 10 are energized, and the main motor and motor 1 of heating roller 13 are
4 starts the operation.

However, if a jam occurs in the phaser section or other paper transport section, the jam signal 3 changes from high level to low level, so that the memory circuit 4 is reset.

As a result, the output Q changes from a low level to a high level, so the transistor 7.9 is turned off and the main motor, the motor 14 of the heating roller 13, is stopped.

At this time, the transinter 11 lights up the ONL jam indicator lamp 12 to notify the customer that a jam has occurred.

This jam display prompts the customer to take action to remove the jam. If the heating roller 13 is jammed with the paper 17 in its mouth, when the print switch 1 is pressed, the output of the NOR gate 5 goes up, the bell changes to high level, and only the relay 10 The jammed paper can be easily ejected.

At this time, although the jam signal 3 is at a low level, the memory circuit 4 is not set and the main motor does not operate.

In addition, when a jammed paper 17 is wrapped around the heating roller 13 as shown in FIG. 3, reverse switches 1B and 19 are incorporated in the motor circuit B of the heating roller 13 shown in FIG. 4 to remove the jammed paper 17. Reversing switch 18.1
9, the motor 14 is reversed and the heating roller 13 is rotated.
The jammed paper 17 may be removed by reversing the direction.

In the embodiment, only the heating roller 13 is rotated in the forward or reverse direction by pressing the start print switch 1 which does not operate even if pressed when a jam occurs, but a separate switch for driving the heating roller 13 may be provided. Needless to say, it's a good thing.

Alternatively, when a jam occurs, the heating roller 13 may be first rotated in the normal direction to check the discharge status of the jammed paper, and if the jammed paper cannot be discharged, a command for reverse rotation may be issued.

Furthermore, it is preferable that the above operations be performed on the control board of the machine.

Since the present invention has been described in detail above, it is possible to easily remove jammed paper from the heating roller portion where it is difficult to remove jammed paper especially when jammed.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of an embodiment of the present invention, Fig. 2 is a motor circuit diagram of the heating roller, Fig. 3 is an explanatory diagram of occurrence of jam in the fixing roller section, and Fig. 4 is another motor of the heating roller. It is a circuit diagram. 1 is a print switch, 4 is a memory circuit, 13 is a heating roller, 14 is a motor, a, l), and C are control means.

Claims (1)

[Scope of utility model registration request] A memory circuit 4 which is set by the ON operation of the print switch 1 to convert the output signal to one level, and which is set by manual input of the jam signal to convert the output signal to the other level, and one of the memory circuits 4 The heating roller motor control means drives the motor 14 of the heating roller 13 with an output signal of one level and stops driving the motor 14 with an output signal of the other level. A paper jam removing device in a fixing device, comprising: a control means C for causing conversion and operating a control means for a heating roller motor.