JPS6325343B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording paper conveyance control device, and more particularly to a recording paper conveyance control device suitable for facsimile machines, copying machines, and the like.

For example, in an after-cut type facsimile machine, the recording paper is fed out from the recording paper roll, goes through recording, development, and fixing steps, is cut to a predetermined size by a cutter, and is then taken out onto a tray. The recording paper must be conveyed intermittently while repeatedly being driven and stopped in response to received image signals. Further, the conveyance amount and conveyance speed must always be accurately controlled. Moreover, when performing recording and fixing, the recording paper must be maintained in a tensioned state, and even when conveyance is stopped, careless conveyance of the recording paper must be prevented. Otherwise, the image will not be recorded at a predetermined position, resulting in misalignment, distortion, uneven recording, uneven fixing, etc., making it impossible to obtain high-quality copies.

When conveying recording paper in this way, it is necessary not only to control the conveyance by considering the conveyance amount, conveyance speed, and recording paper condition, but also to keep the recording paper still without carelessly conveying it even when stopped. However, with this type of conventional recording paper transport control device, it has not been possible to transport the recording paper in a satisfactory manner.

The present invention has been developed in view of the above-mentioned problems.When recording, developing, and fixing are carried out by intermittently conveying a predetermined amount of recording paper from a recording paper roll at a constant speed, the recording paper is It is an object of the present invention to provide a recording paper conveyance control device capable of keeping the recording paper in a tensioned state and also making the recording paper stationary without carrying out careless conveyance when stopped.

In order to achieve this object, the present invention provides a first recording paper transport roller driven by a motor behind the fixing device that constitutes the recording section, and a second recording paper transport roller driven by a step motor. It is characterized in that it is disposed in front of a recording device constituting a recording section, and the conveyance of the recording paper is controlled by a step motor, and when the conveyance of the recording paper is stopped, the excitation of the step motor is released after the motor has stopped.

Hereinafter, an example in which the present invention is applied to a facsimile machine will be described with reference to FIGS. 1 to 3.

FIG. 1 is a diagram showing a recording paper transport path of a facsimile apparatus, in which 4 is a recording paper roll, 2 is a recording device that forms a latent image in accordance with an image signal on the recording paper 1a fed out from the recording paper roll 1, and 3 4 is a developing device that attaches toner 3b to the latent image using a magnet roller 3a to make it visible; 4 is a fixing device that is made up of a heater 4a and a halogen lamp 4b and fixes the visible image onto the recording paper 1a; Reference numeral 5 designates a cutter comprising fixed teeth 5a and rotating teeth 5b for cutting the recording paper 1a into a predetermined size, and 6 a tray for receiving the cut recording paper.

The recording paper 1a is recorded, developed, and fixed in a recording section consisting of a recording device 2, a developing device 3, and a fixing device 4, and then cut into a predetermined size and taken out onto a tray 6. The paper 1a must be conveyed in a predetermined manner as described above in accordance with the image signal input to the recorder 2.

In order to control the conveyance, a first conveyance roller 7 is provided between the fixing device 4 and the cutter 5, and a second conveyance roller 8 is provided between the recording paper roll 1 and the recording device 2.

By arranging the conveyance rollers 7 and 8 in this manner, the recording paper 1a from the recording device 2 to the fixing device 4 can be controlled to a desired state, as will be described later.

The first conveyance roller 7 consists of a metal drive roller 7a and a rubber driven roller 7b, and the roller 7a is configured to be driven by an induction motor.

The conveyance roller 7 is connected to a metal roller 7a and a rubber roller 7.
The reason for configuring the recording paper 1a is as described later.
This is because the second conveyance roller 8 performs conveyance control. That is, the conveyance roller 7 merely applies tension to the recording paper 1a.

Furthermore, the conveyance roller 8 is configured to be driven by a step motor.

Figure 2a is a drive control circuit diagram of the induction motor 7M, where 7F is a D flip-flop;
7R is reed relay, 7T is triax, 7V
is the AC power supply, 7Z is the voltage O (V) of the AC power supply 7V
This is a zero-cross pulse generator that detects the power supply voltage and generates a pulse synchronized with the power supply voltage every half cycle.

Figure 2b is a drive control circuit diagram of the step motor 8M, where 8F is a D flip-flop, 8DL
The logic gates are sequentially switched in accordance with the clock pulse _S4 output from the AND gate AND, and the excitation signal _S2 is gated to drive the step motor 8M via a predetermined amplifier A and transistor Q.
This is a conventional drive logic circuit for exciting the step motor 8M and driving the step motor 8M one step at a time.

Next, the operation of the recording paper conveying system configured as described above will be explained with reference to the time chart shown in FIG.

Since it is not preferable to leave the motor in an excited state for a long time while the conveyance is stopped, the induction motor, drive signal S ₁ , step motor excitation signal S ₂ and step motor drive signal S ₃ are all set to "L". level.

As a result, the flip-flop 7F in FIG. 2 is reset, the reed relay 7R is off, the triax 7T is off, and the induction motor 7M is stopped in a free state.

Also, since the excitation signal _S2 of the step motor 8M is at the "L" level, all transistors Q
is off and stopped in a de-energized state, that is, a free state.

Therefore, in this state, no tension is applied to the recording paper 1a in FIG. 1, and it stands still in a relaxed state.

The induction motor 7M has a fairly large moment of inertia due to its rotor inertia and gear mechanism, and cannot respond immediately to the drive signal _S1 , causing a time delay when starting and stopping.

Therefore, even if drive signals S ₁ , S ₃ and excitation signal S ₂ are applied at the same time as the start of recording in accordance with the image signal input to the recorder 2, the recording paper 1a is not connected to the electrodes of the recorder 2 and the fuser heater 4a. Because it is not in close contact with the surface, it causes misalignment of the recording position, distortion, uneven recording, uneven fixing, etc.

Therefore, in this embodiment, in order to avoid such inconvenience, as shown in the time chart of FIG. 3, the drive signal S ₁ and the excitation signal S ₂ are first set to the "H" level before starting recording.

When the excitation signal _S2 is set to "H", the excitation signal _S2 is outputted through a predetermined logic gate of the circuit 8DL which is open at that time. As a result, the step motor 8M becomes energized at its stop position, fixing the conveyance roller 8 and holding the recording paper 1a stationary.

On the other hand, by setting the drive signal _S1 to "H", the induction motor 7M starts rotating. As a result, the metal roller 7a rotates, and the loosening of the recording paper 1a is eliminated. Since the recording paper 1a is reliably held stationary by the conveyance roller 8, it does not move. The recording paper 1 is rotated by the rotation of the metal roller 7a.
When a certain amount of tension is applied to a, the recording paper 1a
and the metal roller 7a slips, and the metal roller 7a
rotates idly, and no more tension than necessary is applied to the recording paper 1a.

In this way, when the recording paper 1a is in a tense state, the drive signal _S3 is set to "H" at the same time as recording is started.

When the drive signal _S3 becomes "H", the AND gate
A clock pulse _S4 is outputted from AND, thereby switching the logic gate of the circuit 8DL, and sequentially switching the excitation of the step motor 8M to drive it one step at a time. As a result, the recording paper 1a starts to be conveyed intermittently at a constant speed during the recording period via the conveyance roller 8 under the control of the step motor 8M.

When recording is interrupted, the recording paper 1a must be stopped immediately, but if the drive signals S ₁ , S ₃ and excitation signal S ₂ are set to "L" at the same time as recording is interrupted, the induction motor 7M will rotate with inertia for a while. death,
Since the step motor 8M is deenergized and becomes free, the recording paper 1a moves and the next recording position is shifted.

Therefore, in order to stop conveyance of the recording paper 1a when recording by the recording device 2 is interrupted, the drive signal _S3 is first set to "L" as shown in the time chart of FIG. As a result, switching of the logic gate of the circuit 8DL is stopped, and the step motor 8M maintains its current excited state. Therefore, the recording paper 1a is held stationary by the roller 8 and does not move.

Next, by setting the induction motor drive signal _S1 to "L", the induction motor 7M stops after a while. If the excitation signal _S2 is set to "L" in anticipation of this time, the recording paper 1a will stand still without moving at all, and no deviation will occur in the next recording position.

As described above, according to the present invention, the first recording paper conveyance roller driven by a motor is placed behind the fixing device, and the second recording paper conveyance roller driven by a step motor is placed in front of the recording device. The conveyance of the recording paper is controlled by a step motor, so that during recording, the recording paper is intermittently conveyed by a predetermined amount at a constant speed under tension.
Development and fixing are performed in good condition. In addition, since the step motor is energized after the motor has stopped when stopped, the recording paper is prevented from moving at all after recording is interrupted, resulting in high quality recording paper without shifting the next recording position. be able to.

[Brief explanation of the drawing]

FIG. 1 is a recording paper conveyance path diagram showing an embodiment of the present invention applied to a facsimile machine, FIG. FIG. 3 is a control circuit diagram of the pulse motor that drives the roller 8, and is a time chart for explaining its operation. 1...Recording paper roll, 2...Recorder, 3...Developer, 4...Fuser, 5...Cutter, 6...Tray, 7...First recording paper transport roller, 8...Second
Recording paper conveyance roller, 7M...induction motor, 8M...step motor, S1...induction motor drive signal, _{S2 ...} step motor excitation signal, _S3 ...step motor drive signal.

Claims (1)

[Claims] 1. A recording section consisting of a recording device, a developing device, and a fixing device;
A first recording paper conveyance roller disposed at the rear with respect to the recording paper conveyance direction of the recording section, and a second recording paper conveyance roller disposed on the front with respect to the recording paper conveyance direction of the recording section. , wherein the recording paper transport device takes out the recording paper after sequentially performing recording, development, and fixing on the recording paper fed out from the recording paper roll in the recording section;
a drive motor for the recording paper conveyance roller; a drive step motor for the second recording paper conveyance roller; and a drive step motor for the first recording paper conveyance roller when the conveyance of the recording paper is stopped during the recording operation of the recording section. and a control circuit configured to de-energize the step motor driving the second recording paper transport roller after the motor is stopped, thereby preventing undesired movement of the recording paper when the transport is stopped. A recording paper conveying device characterized by: