JPH0780148B2 - Recording paper cutting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a recording paper cutting method.

(Prior Art) FIG. 4 shows a facsimile apparatus. This facsimile apparatus includes a transmission mechanism section 1 and a reception mechanism section 2. In the receiving mechanism unit 2, the roll-shaped recording paper 3
The recording paper 3 is pulled out from the recording paper roll by the platen roller 5, recorded by the recording head 6 and conveyed to the stacker 7. Then, the recording paper 3 on which the recording is completed is conveyed until the recording portion passes through the auto cutter 8, and is cut by the auto cutter 8 there.
The cut recording paper 3 ′ falls on the stacker 7 due to its own weight and is placed on the stacker 7.

(Problems to be Solved by the Invention) By the way, in the above-mentioned facsimile apparatus, the leading edge of the recording paper 3 when it is cut is located on the stacker. Then, when the recording paper 3 is cut, the cut recording paper 3'falls at the rear end while pushing out the front end. If the frictional resistance between the leading end of the recording paper 3'and the stacker or between the leading end of the recording paper 3'and the previously discharged recording paper 3'in this case increases, The trailing edge of the cut recording paper 3 ′ may not only stay at the cut portion, but may also be returned to the inside of the auto cutter 8 by the reaction force of the bent recording paper 3 ′. In this state, the next recording operation is performed, and when the auto cutter 8 is actuated in a state where the next recording sheet 3 overlaps the previously cut recording sheet 3 ', it is cut before. The recording paper 3'is cut together.
In such cases, the previous record must be recorded again. However, in the facsimile apparatus, although the received information is temporarily stored in the memory, it may be erased at the same time as the recording is completed. In such a case, the reproduction of the recording becomes impossible. Further, if a cut piece of the cut recording paper enters the automatic cutter 8, there is a possibility that the automatic cutter 8 may break down.

Therefore, an object of the present invention is to provide a recording paper cutting method that can easily prevent damage to a recording paper on which recording has been completed, and reduce the failure of the auto cutter as much as possible.

[Structure of the Invention] (Means for Solving the Problems) In the recording paper cutting method of the present invention, the output torque of the actuator for driving the rotary blade is the cutting torque of the rotary blade required for one recording paper and the recording paper 2. The recording paper is cut by setting it to a value associated with the cutting torque of the rotary blade required for one sheet.

(Operation) According to the recording paper cutting method of the present invention, even if the rotary blade is operated to cut the next recording paper while the previously cut recording paper remains in the auto cutter, Since the cutting torque of the rotary blade is insufficient to cut two sheets of recording paper, the driving of the rotary blade is stopped, thus preventing damage to the recording paper on which recording has been completed first.

(Embodiment) FIGS. 1 and 2 conceptually show an auto cutter and a control circuit of the auto cutter for carrying out the recording paper cutting method according to the present invention.

The auto cutter 10 includes a fixed blade 12 fixedly installed on a frame 11 and a rotary blade 13 installed swingably on the frame 11.
And have. One end of the rotary blade 13 is engaged with a side surface of a gear 14 supported by the frame 11. The gear 14 meshes with a pinion 16 arranged on the shaft of the pulse motor 15.

Then, in the auto cutter 10, when the rotary blade 13 is driven, the rotary blade 13 makes point contact with one end of the fixed blade 12, and the rotary blade 13
With the rotation of, the point contact position gradually moves toward the other end of the fixed blade 12 with respect to the fixed blade 12.
13 are installed.

In such an auto-cutter 10, the cutting torque of the rotary blade 13 required for cutting one sheet of roll-shaped recording paper that is usually adopted is 2.8 to 3.5 Kg / cm, and two sheets of recording paper are The cutting torque of the rotary blade 13 required for cutting is 7.2 to
It is 8.0 Kg / cm.

On the other hand, in the pulse motor 15, as shown in FIG. 3, generally, the output torque tends to decrease as the motor driving frequency increases.

Therefore, by appropriately setting the motor drive frequency of the pulse motor 15, the cutting torque of the rotary blade 13 is set so that one recording sheet can be cut, but two recording sheets cannot be cut. By doing so, it is possible to avoid cutting the recording paper on which recording has been completed first.

If this is applied to the case of the embodiment (gear ratio 10: 1), the output torque F of the pulse motor 15 for setting the cutting torque of the rotary blade 13 in the range of 3.5 to 7.2 Kg / cm is F _min = 3.5 / (10 × 0.9) = 389g / cm F _max = 7.2 / (10 × 0.9) = 800g / cm (however, the driving force transmission efficiency of the gear is 0.9).

Therefore, the output torque of the pulse motor 15 is 389-800g.
The motor drive frequency may be selected so that the range is appropriately set. For example, if the motor drive frequency is 400 pps based on the graph of FIG. 3, the output torque of the pulse motor 15 will be 620 g / cm, so that the required cutting torque of the rotary blade 13 can be obtained.

In this way, if the drive frequency of the pulse motor 15 is appropriately set to, for example, 400 pps, even if an attempt is made to cut two recording sheets in a stacked state, the pulse motor 15 will be overloaded and step out and rotate. It disappears and the rotary blade 13 is not driven.

When the rotary blade 13 is in such a state, it is preferable to turn off the power supply and immediately stop the pulse motor 15. Therefore, in the embodiment, as shown in FIG. 2, the pulse motor 15 rotating at the drive frequency set by the frequency setting device 17 is in an overloaded state, that is, the pulse motor 15 is out of step. That the photo interrupter stopped
An overload detection unit 19 composed of 19a and a detection plate 19b provided on the gear 14 detects and the motor stop switch 20 is operated based on the detection signal to stop the pulse motor 15.

In the above example, the overload of the pulse motor 15 is confirmed by detecting the rotation stop due to the step-out of the pulse motor 15, but the torque at the step-out of the pulse motor 15 is the torque using the strain gauge. You may confirm the overload of the pulse motor 15 by detecting with a sensor.

Further, in the above embodiment, when the overload of the pulse motor 15 is confirmed, the driving of the pulse motor 15 is stopped, but it goes without saying that the operation of the entire apparatus, for example, the entire facsimile apparatus may be stopped. is there.

Furthermore, in the above embodiment, the pulse motor 15 is adopted as the actuator for driving the rotary blade 13, but a DC motor, an AC motor, a rotary electromagnetic solenoid, a plunger type electromagnetic solenoid, etc. may be adopted instead of the pulse motor. Good. When a DC motor or AC motor is used, the motor drive current increases in an overload state.Therefore, it is detected whether or not this is above a set value, and based on this detection signal, the motor drive current is overloaded. The power supply may be cut off.

[Effect of the Invention] As described above, according to the recording paper cutting method of the present invention, when the two recording papers are positioned inside the auto cutter, the rotary blade of the auto cutter operates. Not done. Therefore, the recording paper on which the recording has been completed is not damaged, and the failure of the automatic cutter due to the cut edge of the recording paper entering the automatic cutter is eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view showing an automatic cutter for carrying out the recording paper cutting method according to the present invention, FIG. 2 is a block diagram conceptually showing a control circuit of the automatic cutter, and FIG. 3 is a pulse motor. 4 is a graph showing the relationship between the motor drive frequency and the output torque, and FIG. 4 is a conceptual cross-sectional view of a facsimile machine equipped with an auto cutter. 10 ... Auto cutter, 11 ... Frame, 12 ... Fixed blade, 13 ... Rotating blade, 15 ... Actuator, 17 ... Frequency setter, 18 ... Motor drive section, 19 ... Overload detection section, 20 ... Switch.

Claims (2)

[Claims] 1. A method of cutting a recording paper, comprising: a fixed blade and a rotary blade, wherein the rotary blade is rotated to cut the recording paper positioned between the fixed blade and the rotary blade. The recording paper is cut by setting the output torque of the driven actuator to a value corresponding to an intermediate value between the cutting torque of the rotary blade required for one recording sheet and the cutting torque of the rotary blade required for two recording sheets. How to cut recording paper. 2. A recording paper according to claim 1, wherein a pulse motor is used as the actuator, and a desired cutting torque is obtained by setting a drive frequency of the pulse motor. Cutting method.