JP2004182418A - Roll sheet residual amount sensing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll sheet residual amount sensing device capable of predicting accurately the residual amount of a roll sheet in which the paper tube outside diameter of the roll sheet and its thickness are taken into consideration, by arranging so that the information of any third party maker difficult to be adapted to the body about the paper tube outside diameter, the roll sheet thickness, etc. is inputted by the user from a roll sheet information setting part provided separately. <P>SOLUTION: The roll sheet residual amount sensing device is composed of a holder for setting the roll sheet in the body, a shaft rotation sensing part to sense the rotation of the roll sheet, a shaft diameter sensing part to sense the diameter of the shaft supporting the roll sheet, a transport part to conduct transportation of the roll sheet, and a CPU part to control a processing part. The sensing method according to this device works upon such a process that the pulse information given by the shaft rotation sensing part for the roll sheet and the paper tube information given by the shaft diameter sensing part for the roll sheet shaft are judged synthetically by the CPU when the roll sheet is drawn out for a certain amount and that the residual amount of the roll sheet is predicted accurately. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus having a roll transport function, and for example, to a printer, a laminator, and the like.
[0002]
[Prior art]
Methods of predicting the length of the roll paper drawn at a constant speed and the rotation angle of the roll paper center axis by a computing unit are disclosed in Japanese Patent Application Laid-Open Nos. 8-113402 and 5-338335.
[0003]
In each case, the roll paper cross-sectional area is obtained from the pull-out amount and the rotation angle, and the remaining roll paper is predicted.
[0004]
[Problems to be solved by the invention]
In each of the disclosed means, only one kind of the outer diameter of the paper tube and the thickness of the roll paper necessary for obtaining the remaining roll paper is assumed.
[0005]
Actually, it is conceivable that there are a plurality of roll papers recommended by the maker, and that a third maker's thing which is not suitable for the main body is used.
[0006]
[Means for Solving the Problems]
For the roll paper recommended by the manufacturer of the main body, the outer diameter of the roll paper core is automatically detected and the roll paper thickness and the remaining amount of the roll paper are predicted in consideration of the user's convenience.
[0007]
The third maker, which is difficult to adapt to the main unit, can accurately predict the remaining amount of roll paper by inputting information such as the outer diameter of the paper core and the thickness of the roll paper from the roll paper information setting section separately provided by the user. Become.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described on the assumption that the present invention is used for paper conveyance of a large-format inkjet printer (hereinafter, printer).
[0009]
The printer includes a holder section for setting printing paper, a transport section for transporting the paper, a printing section for performing a printing operation, and a discharge section for cutting the paper.
[0010]
An embodiment will be described with respect to a holder section and a transport section which are particularly related to the present invention.
[0011]
(Example))
The present invention will be described with reference to FIGS.
[0012]
FIG. 1 is a diagram showing the present invention most easily.
[0013]
This indicates that the roll paper is set in the holder inside the main body.
[0014]
Each part is broadly constituted by a control CPU 8 (hereinafter referred to as CPU 8) for controlling a shaft diameter detecting section (FIG. 2), a shaft rotation output section (FIG. 3), and a roll paper conveying section.
[0015]
The CPU 8 transmits information for transporting a fixed amount to a motor drive circuit 11 (hereinafter, drive circuit 11) in order to transport the roll paper. The drive circuit 11 actually drives the transport motor 10 according to the information. The transport motor 10 rotates the transport roller 9 to transport the roll paper.
[0016]
The transport motor 10 and the transport roller 9 have a proportional relationship in the number of rotations. (In this description, the gear train is omitted and one-to-one is used.)
That is, the CPU 8 can control the transport amount of the roll paper.
[0017]
The transported roll paper rotates the paper tube according to the outer diameter of the roll paper. Further, the rotation force is transmitted to the shaft rotation output portion, changes to a pulse signal, and returns to the CPU 8.
[0018]
FIG. 2 shows a shaft diameter detecting unit. The shaft diameter of the shaft holding the roll paper is detected.
[0019]
This is a case where two types of the roll paper holding shaft 1 (hereinafter, holding shaft 1) are assumed to be a large diameter and a small diameter (there may be two or more types).
[0020]
When the holding shaft 1 has a small diameter, the optical signal emitted from the shaft diameter sensor light emitting unit 4 (hereinafter, shaft diameter sensor light emitting unit 4) is transmitted to the shaft diameter sensor light receiving unit 5 (hereinafter, shaft sensor light receiving unit 5) in a transmitting state. The small diameter is detected by being received.
[0021]
When the holding shaft 1 has a large diameter, the optical signal emitted from the shaft diameter sensor light emitting unit 4 (hereinafter referred to as the shaft diameter sensor light emitting unit 4) is blocked by the holding shaft 1 to be in a light blocking state, and the shaft diameter sensor light receiving unit 5 (hereinafter referred to as the light receiving unit 5). The axis sensor light receiving unit 5) detects no signal and detects that the diameter is large.
[0022]
FIG. 3 shows the shaft rotating portion. The rotation state of the shaft holding the roll paper is detected.
[0023]
The rotation information of the shaft holding the roll paper is transmitted to a shaft rotation detection plate 2 (hereinafter, detection plate 2) via a transmission gear train 3 (hereinafter, gear train 3). In the detection plate 2, a transmission part and a light shielding part are optically arranged at an equal distance from the center of the detection plate 3, and holes of the transmission part are arranged at equal intervals. (See Fig. 6-a)
The rotating detection plate 2 sets the optical irradiation signal from the shaft rotation sensor light emitting unit 7 (hereinafter, shaft rotation sensor light emitting unit 7) to one of a light shielding state and a transmission state. The shaft rotation sensor light receiving unit 6 (hereinafter, shaft rotation sensor light receiving unit 6) becomes a pulse signal in response to the light blocking state and the light transmitting state.
[0024]
FIG. 4 illustrates a method of calculating the remaining amount of roll paper from the amount of roll paper pulled out.
[0025]
Pull-out amount = roll paper transport speed × time rotation angle = 360 degrees × number of measurement pulses / number of pulses per roll rotation Roll paper radius = draw-out amount × 360 degrees / rotation angle / circle ratio / 2
Roll paper cross section = roll paper radius x roll paper radius x pi ratio Paper tube cross section = paper tube radius x paper tube radius x pi ratio Remaining roll paper area = roll paper cross section-paper tube cross section roll paper remaining Amount Length = Roll Paper Remaining Area / Roll Paper Thickness Graph 1 shows the relationship among roll length, winding diameter, paper tube outer diameter, and paper thickness.
[0026]
The conditions are 2 types of roll paper shaft and 2 inch paper tube (2 inch × 25.4 mm + 3 mm thickness × 2 = 56.8 mm).
3 inch paper tube (3 inch x 25.4 mm + 3 mm thickness x 2 = 82.2 mm)
Three types of roll paper thickness 0.3mm thickness, 0.5mm thickness, 1.0mm thickness,
Referring to Graph 1, when the remaining amount of roll paper is about 14 m, a similar state occurs between a 0.3-inch thick 3-inch paper tube and a 0.5-mm thick 2-inch paper tube.
[0027]
However, the roll paper thickness and the remaining amount of the roll paper can be determined by considering the information of the large diameter and the small diameter of the shaft diameter detection.
[0028]
The actual control is to pull out the roll paper to check the state of the roll paper while the user sets the roll paper.
[0029]
Example Conditions 80 pulses per rotation of the roll.
Conveyance speed 100mm / sec
Roll diameter 110mm (Roll paper remaining amount about 14m)
Withdrawal amount 1000mm (diameter becomes narrow for about 3 rounds)
The number of pulses at the beginning of a 0.3 mm thick 3-inch paper tube is 80 × 100 / (110 × 3.14) = 23.1 pulses / sec. The number of pulses after withdrawal is 0.3 mm × 2 × 3 turns = 1.8 mm.
80 × 100 / (108.2 × 3.14) = 23.5 pulses / sec The number of pulses at the beginning of a 0.5 mm thick 2-inch paper tube is 80 × 100 / (110 × 3.14) = 23.1 pulses. The number of pulses after withdrawal per second is 0.5 mm x 2 x 3 laps = 3.0 mm
80 × 100 / (107 × 3.14) = 23.8 pulses / sec As described above, it is possible to obtain a change due to the amount of roll paper near the beginning and end of the roll paper withdrawal. This change is affected by the accuracy of the shaft rotation detection plate 2.
[0030]
FIG. 6 shows the types of the shaft rotation detecting plate.
[0031]
FIG. 6A shows an example in which a round hole is formed. The shaft rotation detection plate 2 can be easily formed by drilling or the like, but if the optical axis of the optical sensor is shifted from the center of the shaft rotation detection plate 2, the output ratio of the sensor output waveform is likely to be affected. FIG. 6B shows an improvement in this point, which is advantageous in terms of cost and performance. In FIG. 6C, the cost is high, but the performance is very advantageous. It is possible to perform fine detection with a detection pattern printed on a film-like material.
[0032]
The rotation pulse signal obtained from the shaft rotation detection plate 2 has a close relationship with the rotation of the roll paper support shaft. When one rotation of the roll paper shaft is set to 360 degrees, the required detection angle is obtained by dividing the desired measurement angle. Two holes are required. Further, the resolution can be set by the ratio of the gear train 3. For example, if it is desired to detect the rotation angle of the roll paper support shaft of 5 degrees, 360/5 = 72 holes are required. However, if the gear ratio of the gear train 3 is set to 4: 1, only 18 holes are required. Processing becomes easier.
[0033]
By using FIG. 6C, it is possible to reduce the influence of the error due to the backlash of the gears and to perform the detection with high accuracy by taking small to large of the gear train 3.
[0034]
FIG. 7 shows an example in which the shaft diameter sensor unit and the shaft rotation sensor unit are integrated.
[0035]
In order to simplify the calculation process of the CPU 8, the number of detection holes is the same, and the length of the detection holes in the width direction is different. Thereby, the sensor output waveform can be distinguished by the ratio obtained as shown in FIGS. 7A and 7B. The ratio of this waveform output is used for shaft diameter detection, and one cycle of waveform output is used for remaining amount detection.
[0036]
FIG. 8 shows a roll paper information setting unit when a roll paper other than the roll paper recommended by the manufacturer is used.
[0037]
It is composed of an input key section and a setting information display section, and these processes are performed by the CPU 8.
[0038]
The input setting will be described with reference to the flowchart shown in FIG. Select the roll paper setting mode with the mode key and press the execution key. Select shaft diameter setting or paper thickness setting with the <and> keys, and press the execution key. The execution key is determined by changing the set value with the <and> keys. Thereafter, the process proceeds to the next process.
[0039]
【The invention's effect】
The roll paper remaining amount detecting device of the present invention performs highly accurate roll paper remaining amount detection by adding a roll paper shaft rotation detection unit and detection of a large diameter and a small diameter of a roll paper support shaft diameter as in the related art. I can do it.
[0040]
Further, it is possible to use a roll paper of a third maker which is difficult to be adapted to the main body by using a roll paper information setting unit provided separately.
[Brief description of the drawings]
FIG. 1 is an overall view showing an embodiment of the present invention. FIG. 2 is an explanatory view of a shaft diameter sensor section. FIG. 3 is an explanatory view of a shaft rotation sensor section. FIG. FIG. 5 is an explanatory view of another embodiment of a shaft diameter sensor section. FIG. 6 is an explanatory view of a shaft rotation detecting plate. FIG. 7 is an explanatory view of shaft diameter detection using a shaft rotation sensor section. FIG. 8 is a roll paper information setting section. FIG. 9 is a flowchart of a setting method of a roll paper information setting unit. FIG. 10 is a graph showing a relationship between a roll paper length and a winding diameter.
REFERENCE SIGNS LIST 1 roll paper holding shaft 2 shaft rotation detecting plate 3 transmission gear train 4 shaft diameter sensor light emitting unit 5 shaft diameter sensor light receiving unit 6 shaft rotation sensor light receiving unit 7 shaft rotation sensor light emitting unit 8 control CPU
9 Transport roller 10 Transport motor 11 Motor drive circuit

Claims (4)

A holder for setting the roll paper inside the main body, a shaft rotation detector for detecting the rotation of the roll paper, a shaft diameter detector for detecting the shaft diameter of the shaft supporting the roll paper, and a transport unit for transporting the roll paper. A roll paper remaining amount detection device including a CPU unit that controls the processing unit.
The detection method uses a CPU to comprehensively judge the pulse information from the roll rotation axis detection unit and the paper tube information of the roll paper shaft diameter detection unit by the CPU when a certain amount of the roll paper is pulled out. It is to predict the remaining amount of paper. 3. The roll paper remaining amount detecting device according to claim 1, wherein the roll paper shaft diameter detecting unit is detected by a mechanical lever and switch shown in FIG. 7. The roll paper shaft diameter detecting section as shown in FIG. 7, wherein the roll paper shaft diameter detecting section and the roll paper shaft rotation detecting section have an integral structure, and the shaft diameter detection and the rotation detection can be simultaneously obtained by pulse information. Roll paper remaining amount detection device. The roll paper remaining amount detecting device according to claim 1, wherein a roll paper that is difficult to be adapted to the main body can be used by a separately provided roll paper information setting unit shown in Fig. 8.

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