JPS60256181A - Controller of fixing device - Google Patents

Abstract

PURPOSE:To prevent a fixing roll from deforming, etc., by storing the latch state of the fixing roll even if the power source is turned off, and releasing the latch with a signal from a latch reset button when the power source is turned on again. CONSTITUTION:When the pressure roll and heat roll of the fixing device 9 are latched, the latch flag in a nonvoltile memory 7 is set. The latch flag in the memory is held set except at a normal stop, and when a CPU4 is powered on, the latch flag in the memory 7 is referred to, thereby judging whether a latch resetting sequence is entered or not. If the power source is turned off suddenly and turned again, the latch flag in the memory 7 is checked and when set, it is judged that the latch can not be release, thereby releasing the latch with the signal from the latch release button 10. Thus, even if the equipment is powered off during operation to stop, the latch is released and the deformation of the fixing roll, etc., are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a fixing device that performs fixing on a recording support such as copy paper using a pair of rolls.

[Conventional technology]

In devices such as copying machines and plinks, fixing processing is performed at the final stage of the process to obtain 1111-bit first-class image recording.For example, in a copying machine, as shown in Fig. When fusing the copy paper (1), the Ta-netsu method is widely used, which uses a pair of rolls consisting of a heating roll (2) and a pressure roll (3) that is pressed against it with a force of P. It is used.

By the way, conventionally, in a copying machine equipped with such a fixing device, during operation, as shown in +A+ in the same figure, an addition of 1" fE []-
The pressure roll (3) and the heating roll (2) are latched, but the pressure roll (3) and the heating roll (2) must be unlatched before the mechanism is actually operated. Since it took a certain amount of time for the latch to be released, the mechanism L latch could not be released if the power was suddenly cut off and the copying machine stopped. If the latch is set so that it cannot be released, the heating roll (2) may be deformed by the pressure P, or the copy paper (1) may get caught between the pressure roll (3) and the heating roll (2). In some cases, the copy paper (1) may catch fire.

[Problem that the invention seeks to solve]

This invention prevents the roll of the fuser from deforming if the power goes out and the device suddenly turns on.
This is an attempt to solve the problem that there is.

[Means and effects for solving the problems] This invention has the following features:
For this reason, it is designed to remember that the fuser roll is in the latched state even after the power is turned off. Lunch will be canceled if the condition is judged to be poor.
1'', a signal from the tongue causes the latch of the D-rule to be released.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 to 3 are a block diagram and a control flowchart of a control system showing an embodiment of the present invention. In FIG. ), (5) is rank l, access memory (RAM), +6) beam -1... only memory (ROM), and this ROM (IJ1 in 61, Fig. 2,) and fig. ]・As shown,
A professional club using a latch flag for launch control of a pair of fixing rolls is stored. +71
is a read/write nonvolatile memory that retains its own memory contents even when the power is turned off. V) Memo January 7) 1 is provided. (8) is written in - CPU Turns on and off external devices according to commands from +41, reads data from the outside and transfers it to CPU (41) (9) is a f-thermal type fixing device that fixes the copied image on copy paper using a pair of rolls consisting of a heating roll and a pressure roll as described above; (1α is a fixing device); Vessel (9
), the latch release button is used to release the latch of the roll.
The application roll and heating roll are launched by energizing the launch solenoid, and when the latch state is reached, the latch flag in the non-volatile memo 7) is set. Since this latch flag is provided in the nonvolatile memory, its memory contents are maintained even if the power supply is cut off.

Next, referring also to FIGS. 4 and 5, the operation of the -1-actual male side device will be described.

First, as shown in Figure 2, when the pressure roll and heating roll of the fuser (9) are latched, the latch flag in the non-volatile memo is set.
It will be done. In normal cases, this latched state is actually released by releasing the latch of the pressure roll and heating roll, and then by pressing the mechanism as shown in the timing chart of the latch solenoid and main motor in Figure 4. up to a certain time nl
Since t is secured, the lunch can be released, but the latch cannot be released in the event of an abnormal situation, such as when the power is removed during operation as shown in Figure 5, and the latch solenoid and main motor are turned off at the same time at time L', causing the copying machine to stop. , determines whether it is the former case or the latter case, and if it is normal, resets the latch flag in the non-volatile Memo January 7), and if not, resets the latch flag in the non-volatile Memo January 71). The latch flag inside is not reset and remains set.

Therefore, except for a normal stop, the latch flag in the non-volatile v1 memo (I/7) remains set, and the CPU (
4+ then executes the pro club shown in Figure 8 which refers to the state of the latch flag in the non-volatile memo 7) to determine whether or not to enter the latch release sequence when the power supply is turned on. .

That is, when the power is turned on, it is determined whether or not the latch flag of the CPU (41 is a non-volatile memory) is set by referring to the latch flag. Here, when the determination result is NO, this program ends, and when the determination result is YES, the program proceeds to the next step. As mentioned above, non-volatile memo (January 7) can retain its stored contents even if the power is cut off, so if the power is suddenly cut off, the latch of the roll of the fuser (9) will be released. Even if the copier stops in a situation where it cannot be used, the non-volatile memo 1
The latch flag in month 7) remains set even after its interruption. Therefore, when the power is turned on again as described above, the latch flag in the non-volatile memo (January 7) is referenced, and if it had been set, it is determined that the latch could not be released, and the latch release sequence is entered. .

The unlatch sequence begins with the unlatch button (
1α is turned on or not, and press the latch release button (
If 10) is on, turn the main motor to release the latch.

In this way, the pressure roll and heating roll of the fixing device (9) are released from the latch. Therefore, even if the pressure roll and heating roll are latched during operation, the latches can be released even if the power is suddenly cut off and the copying machine stops. As a result, there is no possibility that the latch cannot be released, deforming the heating roll, or burning the copy paper, unlike in the past, and even if the power is removed during copying and the copier suddenly shuts down, Even if it stops, turn the power back on and press the latch release button (10
) can be used to release the latch.

〔Effect of the invention〕

As described above, the present invention can release the latch of the pair of rolls of the fuser even if the power is suddenly cut off during operation and the device stops, thereby preventing damage to the rolls of the fuser. It has the effect that it can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a device according to an embodiment of the present invention, and FIGS. 2 and 3 are flowcharts 1 and 4 showing its control operation.
The figure shows a timing chart of the latch solenoid and main motor in a normal case where the fuser roll latch can be released, Fig. 5 shows the same timing chart in an abnormal situation where the latch cannot be released, and Figs. 6 (A) and (Bl) It is an explanatory diagram showing the latched state and the unlatched state of the rolls. +21... Heating roll +31... Pressure roll (4)... CPU +61...
・・ROM (7)・・・Non-volatile memory (9)・
... Fuser (10) ... Latch release button Fig. 41 Fig. 5 Capacitor nod -1--"-1111-l--
---Main t-2--11-cho-11-11]----t' Bi J COC-

Claims (1)

[Claims] In a device that obtains an image record by fixing onto a recording support using a pair of fixing rolls, there is provided a memory means for remembering that the rolls are in a latched state even when the power is cut off, and releasing the latch. When the device is stopped due to a power cut and the power is turned back on, the roll determines whether the latch release state is the latched state, and if it is in the latched state, the latch release button is released. A control device for a fixing device, comprising means for controlling the roll to release the latch according to a signal from the fuser.