JPH0641418Y2 - Fax machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a facsimile apparatus provided with two types of roll paper.

(Prior Art) Conventionally, there is known a facsimile apparatus that includes two types of roll papers having different paper widths and selects the roll paper according to a transmission document. However, there is a case where one roll paper is used but the other roll paper is left unused for a long period of time, and in such a case, the other roll paper is left under tension for a long time. Therefore, there is a habit, and when it is used there, jamming is likely to occur.

If the conventional device equipped with two rolls is large, the roll paper will not be unduly tensioned, but if it is small, it will be kept unduly tensioned or the above-mentioned problems will be prevented. For this reason, if the layout was set so that it would not apply excessive tension, the operability would be sacrificed.

(Object of the Invention) The present invention solves the above-mentioned problems of the prior art, and provides a facsimile device capable of preventing the occurrence of a jam even in a small device.

(Structure) The present invention is a facsimile apparatus that includes two types of roll paper for a set of recording units including a thermal head and a platen roller, and uses one of the two types of roll paper for recording operation as needed. When each roll paper is set and the ejection operation is not performed within the specified time,
The control means is provided so that the discharging operation is performed at least once at a predetermined time.

As a result, the roll paper is not maintained in the same tension state for a long time, and therefore, the occurrence of jam can be prevented.

(Example) Hereinafter, an example will be described in detail with reference to the drawings.

FIG. 1 shows a transport system according to an embodiment of the present invention.
1 is a thermal head, 2 is a platen roller, 3 is a cutter, A is a first roll paper, B is a second roll paper, R ₁ ,
R ₁ ′ and R ₂ and R ₂ ′ are feed rollers, R ₃ and R ₃ ′ are discharge rollers, and S ₁ , S ₂ and S ₃ are sensors that detect recording paper.

Now, as shown in FIG. 2, it is assumed that the leading edge of the roll paper A is slightly ahead of the printing position and is in a recording standby state. This is in a state similar to that of a normal 1-roll paper device. On the other hand, the leading edge of the roll paper B is stopped at the standby position. Therefore, when printing on the roll paper A, the platen 2 rotates in the direction of arrow C to start recording.

Here, for example, roll paper A is A3 size and roll paper B is
B4 size, roll paper A for A3 recording, roll B for B4 recording and below. Now, in the state shown in FIG. 2, when recording with the roll paper B, first, the platen roller 2 and the feed roller R ₁ are rotated in the D direction to return the leading end of the roll paper A to the standby position. The platen roller 2 and the feed rollers R ₁ and R ₂ have a driving unit. next,
The feed roller R ₂ rotates in the C direction and feeds the front end of the roll paper B. At this time, since the platen roller 2 is also rotating in the C direction, the leading edge of the roll paper B enters between the thermal head 1 and the platen roller 2. In this way, the recording paper is selected and recording is performed.

If, as in the conventional case, one roll paper is not used for one month after being set as a result of facsimile reception, as in roll paper B in FIG. 1, the roll paper is left as it is sandwiched between the feed rollers. Therefore, under the influence of changes in temperature and humidity and tension during that time, as shown in FIG. 3, a dogleg-shaped habit is formed, leading to deterioration in transportability and a printing surface.

Therefore, in the present invention, for example, a timer for about 24 hours is set, and if a roll paper that has never been used comes out during that time, the roll paper will be set at a preset time for 10 hours.
Discharge only the length of about cm. By performing such a discharging operation, it is possible to avoid leaving it under tension for a long time, and it is possible to smoothly carry the sheet for the next printing.

It should be noted that, if necessary, some printing is performed on the discharged portion, so that the user can prevent the blank output from being mistaken as a mistake. For example, when printing a fixed phrase,
Alternatively, a management report may be output.

The transfer is controlled by the CPU. As shown in FIG. 4, all the detection signals of the sensors S ₁ , S ₂ and S ₃ are sent to the CPU, and the thermal head 1,
It controls the cutter 3, the platen roller 2, and step motors that drive the feed rollers R ₁ and R ₂ , respectively. In FIG. 2, when the roll paper A is set in a printable standby state, its leading edge is once sent to the position of the sensor S ₃ ,
From that point, it is moved backward by the step motor by the determined number of pulses, and stops at the printing position with a normal leading edge margin. When ejecting the leading edge of roll paper that has not been used for a long time, retract the roll paper that has been set as described above, and move the unused roll paper forward so that the leading edge of the roll paper is detected by the sensor S ₃
After the detection is performed in step S3, the print head may be moved forward for a certain number of steps without being moved backward, and a predetermined print signal may be given to the thermal head to print.

In the embodiment, two types of roll paper having different sizes are described, but two roll papers of the same size are set,
It may be used alternately for each communication.

(Advantages of the Invention) As described above, according to the present invention, the roll paper is not maintained in the same tension state for a long time, and therefore, the conveyance for the next printing can be smoothly performed. The occurrence of jam can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a roll paper transport system according to an embodiment of the present invention, FIG. 2 is an operation explanatory diagram when switching from roll paper A to roll paper B, and FIG. FIG. 4 is a diagram showing a curled state of the roll paper left to stand, and FIG. 4 is an explanatory diagram of the control system. 1 ... Thermal head, 2 ... Platen roller, 3 ... Cutter, A, B ... Roll paper.

Claims (1)

[Scope of utility model registration request] 1. A facsimile apparatus comprising two types of roll paper for a pair of recording units consisting of a thermal head and a platen roller, and performing recording operation on any one of the roll papers, if necessary. When the ejecting operation is not performed within a predetermined time in each of the set states, a control unit is provided to perform the ejecting operation at least once at a predetermined time, and the roll paper is kept under the same tension for a long time. Facsimile machine characterized by not being maintained in a state.