KR102592898B1 - System and method for controlling rewinder and unwinder of media rolls for printer - Google Patents

Abstract

The purpose of the present invention is to calculate the thickness of the media depending on the type of media caught on the take-out roller and optimize the degree to which the printing fabric is adhered to the feeding belt by pressing the tension rod accordingly. On the other hand, depending on the use of the media, the remaining thickness is optimized. Calculate the amount of media (length and diameter) and optimize the torque and tension of the take-up roller and pull-out roller according to the diameter and weight of the remaining media, ultimately predicting when the media will be used and operating the system. Provides a winding and withdrawal control system and method for a printing media roll that can be used for printer operation by predicting even the expected stopping point, and can calculate the thickness of such media and the amount of remaining media (length and diameter) in a simple manner. will be.

Description

System and method for controlling winding and withdrawal of media rolls for printing {SYSTEM AND METHOD FOR CONTROLLING REWINDER AND UNWINDER OF MEDIA ROLLS FOR PRINTER}

The present invention relates to an improvement in a system and method for controlling the winding and withdrawal of a printing media roll. More specifically, the present invention relates to an improvement in a system and method for controlling the winding and withdrawal of a printing media roll. More specifically, the roll on which the printing media of a large printer such as a textile printer is wound is withdrawn from one side while printing is performed on the media, and printing is performed on the other side. To provide a winding and withdrawal control system and method to simplify the entire printer system by calculating the dimensions, such as the thickness and length of the printing media roll, in a simple way and using it to control tension in a system that winds the media into another roll. will be.

In general, a digital inkjet printer is a printing device that allows the user to draw the desired design by digitizing the desired output signal from a digital control unit and supplying ink to a head that sprays ink to create various colors by overlapping the color on the printing paper. am.

Materials printed through these digital inkjet printers are divided into roll-type material printers such as cloth and paper and flat-type material printers such as acrylic plates, depending on the material. Recently, roll-type materials and flat-type materials can be combined in one printer device. Hybrid-type digital printers available are also available.

Among them, digital printing devices made of roll-type materials and hybrid-type digital printing devices digitize the desired output signal in the digital control unit and then print ink on the head that sprays ink, for example, magenta (M), yellow (Y), cyan (C), and black. It is a large-scale printer that allows the user to draw the desired design by supplying ink such as (K) and applying various colors to roll-type printing paper (hereinafter referred to as 'media').

As an example, Figure 1 is a diagram schematically showing a digital printing device 10 made of a roll-type material of the first prior art, and is provided with a pull-out portion ( 12) is formed, and a print unit 13 is installed horizontally on one side of the drawing unit 12 to digitize the desired output signal from the control unit and spray ink onto the object to be printed. ) The winding unit 14 is fixed to the bottom of one end of the print unit 13 of the printed matter printer 10, which includes a winding unit 14 installed at the bottom of one side and capable of winding the printed matter. It includes a drying unit 100 that is located on the upper part and is provided to dry the ink printed on one side after passing through the printing unit 13.

Therefore, when the printout printer is driven to print a printed matter, as shown in FIG. 1, the printed matter wound around the drawing unit 12 is pulled out from the drawing unit 12, and the pulled out printed matter is taken out from the printing unit. While passing through (13), the printed object is printed by the ink sprayed in response to the output signal desired by the control unit, and moves toward the drying unit 100, and is printed on the upper surface of the media in the print unit 13 by the ink sprayed in response to the desired output signal from the control unit. The printed matter, which is printed by ink sprayed in response to an output signal and dried by the drying unit 100, is guided through a guide roller and moves toward the winding unit 14 to be wound by the rewinder of the winding unit.

Meanwhile, as shown in FIG. 3, the hybrid digital printing device is equipped with a feeding belt 30 in the form of an endless track with a flat upper surface so that both roll-type material and flat material can be printed in a single printer unit. Again, the drive motor rotates the feeding roller 20 at a predetermined torque, and the feeding roller and the driven roller are installed and rotated substantially in parallel around the printing unit. The feeding belt 30 is installed in a zigzag shape on the outer surfaces of the feeding roller and the driven roller. As the feeding roller and the driven roller rotate, a predetermined area runs in engagement with a predetermined area of the printing unit, and the remaining predetermined area travels flat.

In addition, the media supplied by being wound around a large unwinder is large, with a radius of, for example, 3 to 5 m. As the thickness or weight of the media wound around the unwinder varies, the size of the unwinder may vary. The torque must change, and the tension adjustment for the degree of loosening of the pull-out roller must also change accordingly. If the pull roller is released too easily, wrinkles may form in the media, and if it is too tight, problems may occur with the texture of the media.

On the other hand, the existing digital textile printing device is equipped with a tension bar to maintain the tension of the media and transport it. This tension bar is manually lifted and lowered, which significantly reduces workability, and because the tension bar is manually operated, the pressure given to the media is reduced. The tension was uneven.

Therefore, for the purpose of improving this, Republic of Korea Patent Registration No. 10-1165025, whose invention title is “Fabric Tension Control Device for Textile Printer,” is disclosed as a second prior art. The second prior art is for feeding printing. The purpose is to provide a fabric tension control device for a textile printer that facilitates the initial supply of printing fabric by automatically raising and lowering the tension rod, which provides tension to spread and supply the fabric, by manipulating the cylinder.

When the second prior art is described with reference to FIGS. 2 to 4, the fabric tension control device of the textile printer according to the second prior art includes a main body 10, a support 40, a rotating rod member 50, and tension. It includes a rod member 60 and an automatic operation unit 100.

The main body 10 forms the outline of the textile printer and includes a feeding roller 20, a feeding belt 30, a support 40, a rotating rod member 50, a tension rod member 60, and an automatic operation unit 100. It plays a supporting role.

In addition, the feeding roller 20 is rotatably formed on the main body 10, and in particular, is rotatably formed on both front edges of the main body 10. At this time, a pair of feeding rollers 20 are provided and arranged side by side. And, one or both of the feeding rollers 20 are connected to a drive motor (not shown) and are forced to rotate.

Meanwhile, the feeding belt 30 is wound around a pair of feeding rollers 20 parallel to each other and is formed in an endless track shape. Therefore, the feeding belt 30 rotates infinitely when the feeding roller 20 rotates. In particular, the feeding belt 30 is preferably formed as a flat belt, and therefore, the feeding belt 30, which is a flat belt, supports the printing fabric 2. Then, the feeding belt 30 is forcibly transferred by the rotation of the feeding roller 20, and as a result, the printing fabric 2 is forced to move forward. In particular, the feeding belt 30 is wound around a pair of feeding rollers 20 and rotates infinitely while the feeding rollers 20 rotate. Here, the feeding belt 30 rotates infinitely in the forward direction, which is perpendicular to the axial direction of the feeding roller 20, and as a result, the printing fabric 2 is forcibly fed.

Meanwhile, supports 40 are formed on both edges of the main body 10 in the direction in which the printing fabric 2 is fed.

In addition, the rotating rod member 50 is rotatably connected to each of the supports 40 at its edges. That is, the rotating rod member 50 can rotate while both sides are supported by the corresponding supports 40.

In addition, the tension rod member 60 is in contact with the printing fabric 2 supported by the feeding belt 30 and serves to apply tension to the supplied printing fabric 2. In other words, the tension rod member 60 serves to press the printing fabric 2 so that the printing fabric 2 comes into close contact with the feeding belt 30 and is stretched and supplied in a pulled state. Accordingly, the tension rod member 60 is relatively heavy.

In particular, when the printing fabric 2 is initially supplied to the feeding belt 30, the operator prior to the second prior art must lift the tension rod member 60 and lower it again. At this time, since the tension rod member 60 is formed relatively long, it is difficult to raise it, and after lowering it, it may not be able to press evenly along the axial direction on the printing fabric 2.

The tension bar member 60 of the second prior art is automatically raised and lowered by the automatic operation unit 100, providing convenience to the operator when raised, and can press the printing fabric 2 evenly along the axial direction. Printing defects can be prevented.

Here, the automatic operation unit 100 includes a main bracket 110, a sub bracket 120, and a cylinder member 130.

The main bracket 110 serves to connect the rotating rod member 50 and the tension rod member 60 supported on the support 40. At this time, the main bracket 110 is formed on opposite sides of the rotating rod member 50 and the tension rod member 60, respectively.

In addition, the sub bracket 120 extends from the main bracket 110 and extends from the main bracket 110 starting from the rotating rod member 50. In addition, it is preferable that the pair of facing sub-brackets 120 are connected by a reinforcement bar 122 so that they can move along the arc trajectory at the same speed.

Additionally, the cylinder member 130 is hingedly connected to the main body 10 and to the sub-bracket 120. Therefore, when the cylinder member 130 moves forward and backward by external manipulation, the sub-bracket 120 moves forward and backward along the arc trajectory. Because of this, the main bracket 110 moves forward and backward along the same trajectory as the sub bracket 120, starting from the rotating rod member 50. Accordingly, the tension rod member 60, like the sub-bracket 120, moves forward and backward along the arc trajectory and is automatically raised and lowered. That is, when the cylinder member 130 operates to advance the sub-bracket 120 along an arc trajectory, the tension rod member 60 rises along the arc trajectory together with the main bracket 110.

Conversely, when the cylinder member 130 operates to move the sub bracket 120 backward along the arc trajectory, the tension rod member 60 moves down along the arc trajectory along with the main bracket 110 by a set distance. At this time, 'set distance' refers to the distance moved so that the printing fabric 2 fed by the tension rod member 60 is spread out while being in close contact with the feeding belt 30.

Meanwhile, the rotating rod member 50 is preferably connected to the support 40 in an easily detachable manner, and the support 40 preferably forms a mounting portion 200 for mounting the edge of the rotating rod member 50.

Therefore, according to the fabric tension control device of the textile printer of the first prior art, the tension rod that provides tension to spread and supply the printed fabric to be fed is automatically raised and lowered by operating the cylinder, thereby facilitating the initial supply of printing fabric. Since the degree to which the printing fabric is adhered to the feeding belt can be maintained at a constant level by pressing the tension rod using a cylinder, the tension on the printing fabric can be kept constant.

However, since the thickness of the media is different from each other, it is necessary to press the tension rod to vary the degree to which the printing fabric adheres to the feeding belt. However, there is no measure for this in the second prior art, and the thickness is also different from that of the media. The values provided by the manufacturer are different from the values recognized by the actual printer device, which causes slight errors. Not only that, but above all, the weight of the pull-out roller immediately after initially loading the media and the weight of the pull-out roller immediately after the media is first loaded, and the weight of the pull-out roller after using almost all of the media, use only a little. Even though the weight of the take-out roller in the remaining case and the weight on the take-out roller in the middle case are different from each other, if the torque of the roller drive motor is applied the same, the degree of tautness (tension) of the media cannot be kept constant, resulting in a small error. There was a limit to what could be done.

On the other hand, in order to solve some of the problems of the second prior art, Korean Patent Publication No. 10-2014-0122878, whose title is “Automatic Roll Fabric Supply Control Device for Printing on Large-Scale Printers,” is disclosed as the third prior art.

When the third prior art is described with reference to FIGS. 5 and 6, as shown in the drawings, a guide rail and support frame (100) of a certain length is installed on a support stand provided at the back of a large printer (not shown) or at a separate point. ) is installed, one or more slide grooves 101 are formed long on the upper side of the guide rail and support frame 100, and left and right roll fabrics are erected at a certain height on one side and the other side of the guide groove 101. The installation stands 200 and 300 are installed at positions where a constant distance from each other is maintained.

The left and right roll fabric installation stands (200, 300) are composed of a fixing plate 210 coupled to the guide rail and support frame 100, and a support bar (210) protrudes at a certain height on the upper side of the fixing plate 210. 220) is configured, and a shaft-coupling housing 230 is configured at the upper end of the support bar 220, and a rotating shaft 240 is coupled to the shaft-coupling housing 230, and the rotating shaft 240 It can be designed as a structure in which a rotary wheel 250 is coupled to one side of the roll fabric so that it can rotate while part of it is inserted into the grooves on both sides.

In addition, the guide block 210 is configured in a "∩" shape to fit tightly with the guide rail and support frame 100, and is fastened to the slide 101 formed on the guide rail and support frame 100. By binding the adjustment means (A), it is configured to enable not only a firm tightening connection but also easy adjustment of the left and right spacing by loosening it if necessary.

The shaft coupling housing 230, which is formed at the upper end of the support bar 220 behind the rotating wheel 250 provided on one of the left and right roll fabric 200 and 300 installation stands, has the above-mentioned housing 230 protruding in front of the support bar 220. A wheel gap adjustment means having an adjustment bolt and a handle may be configured to arbitrarily adjust the protrusion gap of the rotating wheel 250.

In addition, the rotation wheels 250 of the left and right roll fabric installation stands 200 and 300, which are configured symmetrically, have a plurality of slim slats to minimize slippage when inserted into the inner groove of the roll fabric and then rotated. A prevention groove 251 may be additionally formed.

In addition, a bracket 110 including wheels 111 on both sides of the guide rail and support frame 100 with bearings installed and rotated for easy movement will be formed to make it easier to use. You can.

In particular, in the present invention, the rear of the rotation shaft 240 including the rotation wheel 250 of the other of the left and right roll fabric 200 and 300 installation stands is provided for signal processing of a program input to the control unit or operation by the user. Its main feature is that it is equipped with a drive control servo motor (M) that automatically controls the rotation drive and speed of the roll fabric while rotating forward and reverse.

And at one end of the rotary shaft 240 coupled between the automatic control servomotor (M) and the rotary wheel 250, the torque value (resistance value) applied to the rotary shaft 240 during fabric supply is measured in real time. A torque sensor 650 can be installed to enable measurement. The torque sensor 650 stops the rotation of the roll on which the fabric is wound while the pulling force on the fabric accompanying the printer's printing operation is applied. In this case, the tension value (the degree of tension of the fabric, or its tension) applied to the fabric between the printer and the roll can be confirmed through real-time measurement of the torque value applied to the axis of the rotating shaft (240), which can be measured using a servo motor for automatic control (M ), when used as a drive control value, the tension value of the fabric can be automatically adjusted to a uniform and highly efficient state at all times despite the variables of various conditions.

At this time, the torque sensor measures the torque value for twisting (torque, load for rotational force, or twisting moment, etc.) with a strain gauge and then outputs it as an analog or digital signal, and is connected to one side to which the strain gauge is attached. When the shaft is given a non-rotating (fixed) condition and a certain twist or load is applied from the drive unit or load unit on the other side, a constant resistance moment appearing on the non-rotating shaft side is detected with the strain gauge and then signal is transmitted. A non-rotating (=fixed) torque sensor that can be transmitted externally (analog or digital signal) through a means; a fluid condition in which both the shaft on one side with a strain gauge attached and the shaft on the other side, which is the driving part or load part, can rotate are provided. , when a certain load is applied to one driving part, the predetermined resistance moment that appears between them is measured with the strain gauge, and then transmitted to the outside through a contact signal transmission means or a non-contact signal transmission means (analog or digital signal). Rotary torque sensors are typically used.

However, not only the first prior art, but also the second prior art, above all, the weight of the pull-out roller immediately after the media is first loaded, the weight of the pull-out roller when almost all of the media is used and only a little remains, and the weight of the pull-out roller when the media is almost completely used and only a little remains, Even though the weight on the pull-out rollers in each case is different, if the torque of the roller drive motor is applied equally, the degree of tautness (tension) of the media cannot be maintained constant, which is a limitation in that a small error occurs. Additionally, the thickness of the media cannot be adjusted. The problem is that the technology to accurately predict and variably adjust the tension according to the level of remaining media, and to accurately stop media feeding just before the media ends, is insufficient, resulting in minor errors during printing. there was.

For reference, it is also possible to consider a method of feedback control using a sensor, but since the sensor's precision must be high, costs are added, and since it is a method of adjusting after an error occurs, extremely small errors can be avoided. There is a limit.

Patent Document 1: Republic of Korea Patent No. 10-2264749 (Name: Ink drying device capable of preventing deformation of printed matter) Patent Document 2: Republic of Korea Patent No. 10-1165025 (Name: Fabric tension control device for textile printer) Patent Document 3: Republic of Korea Patent Publication No. 10-2014-0122878 (Name: Roll fabric automatic supply control device for printing on large format printer)

The present invention is intended to solve the above problems, and its purpose is to accurately and easily predict the amount (length and diameter) of media remaining after use, and thereby adjust the roller drive motor according to the weight applied to the take-out roller and take-up roller. This is to keep the degree of tension (tension) of the media constant by optimally adjusting the torque in real time.

In addition, an additional object of the present invention is to optimize the degree to which the printing fabric adheres to the feeding belt by calculating the thickness of the media depending on the type of media and pressing the tension rod accordingly, and to adjust the tension rod variably according to the degree of remaining media. It optimally adjusts the degree of pressurization and further accurately stops media feeding just before the media ends.

Above all, it is to provide a system and method for controlling the winding and withdrawal of media rolls for printing that can calculate the thickness of such media and the amount of remaining media (length and diameter) in a simple manner.

The above objects and other additional objects will be clearly recognized by those skilled in the art without departing from the technical spirit of the present invention by the appended claims.

The winding and withdrawal control system for a printing media roll according to the first aspect of the present invention for solving the above problem includes a printing and drying unit that prints a predetermined pattern on the media 21 of the media roll 20 and dries it. 50), a drawing unit 10 on which the media roll 20 is detachably mounted and where the media 21 is pulled out in response to the operation of the printer and supplied to the printing and drying unit 50, and a printing and drying unit (50) A winding and withdrawal control system 100 for a printing media roll of a roll-type material printer including a winding unit 40 for winding media 21 from 50), which is mounted on the rotation axis 13 of the drawer 10. a sensor signal receiver 130 that receives a sensing signal from the sensor 16 that detects rotational displacement and processes the signal; An input/output unit 120 that inputs and outputs information about the media role to the control system; And the thickness and length of the media roll are calculated based on the information about the media roll input by the input/output unit 120 and the sensing information from the sensor signal receiver 130, and based on this, the first an operation and control unit 110 that controls the operation of the motor 11 and the second motor 41 of the winding unit 40, as well as the printing and drying unit 50; It is characterized by including.

Preferably, a tension adjusting unit 30 that adjusts the tension of the media drawn out from the drawing unit 10; It further includes, and the operation and control unit 110 is characterized in that it also adjusts the tension of the tension adjuster 32 of the tension control unit 30.

Also preferably, the sensor for detecting the rotational displacement is a rotary encoder 16, and the draw-out unit 10 is configured to operate the first motor 11 for driving the draw-out roller through the sprocket chain 12 and the first rotation shaft ( 13), and the pull-out roller 15 is rotated through the axis of the bracket 14. A rotary encoder 16 is mounted on the rear rotation axis 13' of the first rotation axis, and the rotation axis It is characterized by converting the mechanical rotational displacement into an electrical pulse.

Also preferably, the thickness (t) of the first media roll of the newly installed media roll is determined by the calculation and control unit 110 based on the outer diameter (D), inner diameter (d), and total length (L) information of the media roll. It is characterized by being calculated by the following [Equation 1] to [Equation 4].

[Equation 1]

X = perimeter of the inner diameter (πd) + (perimeter of the outer diameter (πd) -The perimeter of the inner diameter (πd)) / 2

[Equation 2]

Y = (Outside diameter (D) - Inside diameter (d)) / 2

[Equation 3]

n(number of repetitions of X) = total media length (L) / X

[Equation 4]

Media thickness (t) = Y / n

Also preferably, the control unit controls the media to move by a certain distance (Δℓ) and the change amount (θ) of the sensor that detects the rotational displacement mounted on the take-out roller rotation axis 13' of the take-out unit 10. ) is sensed and calculated to calculate the amount of media remaining on the pull-out roller 15 from [Equation 5] to [Equation 9] below.

[Equation 5]

Moving distance (Δℓ) = Circumference of outer diameter (πD') * Moved angle (θ) / 2π = D'·θ/2

[Equation 6]

X '= circumference of the inner diameter (πd) + (perimeter of the outer diameter (πd')

[Equation 7]

Y' = (Outside diameter (D') - Inside diameter (d)) / 2

[Equation 8]

n' (number of repetitions of X') = Y' / media thickness (t)

[Equation 9]

Remaining media length in use (ℓ) = X' * n'

The method for controlling the winding and withdrawal of a printing media roll according to the second aspect of the present invention to solve the above problem includes (a) receiving an initial value through the input/output unit 120 of the control system 100 (S1) ; (b) After step (a), the calculation and control unit 110 calculates the media thickness (t) according to [Equation 1] to [Equation 4] (S2); (c) after step (b), controlling the first motor 11 and the second motor 41 to initially drive for a certain distance with an initial torque value determined according to initial conditions (S3); (d) after step (c), issuing a control signal to the printing and drying unit 50 to control the printing and drying unit to operate (S4); (e) after step (d), receiving a sensing signal from the sensor (S5); (f) calculating the amount of media remaining in use from the sensing signal received in step (e) (S6); (g) After step (f) above, is the remaining media length (ℓ) in use less than a certain value (ℓo)? A step of checking whether or not (S7); and (m) if the determination result in step (g) is 'N', then as the median torque value of the first motor 11 and the second motor 41 according to the condition suitable for the remaining media length (l) during use, Changing the control value (S12) and returning to step (c); It is characterized by including.

The method for controlling the winding and withdrawal of a printing media roll according to the third aspect of the present invention to solve the above problem includes (a) receiving an initial value through the input/output unit 120 of the control system 100 (S1) ; (b') After step (a), the calculation and control unit 110 secures media thickness (t) information from the directly calculated or pre-stored database 140 or from the input/output unit 120 ( S2); (c) after the step (b'), a step (S3) of controlling the first motor 11 and the second motor 41 to be initially driven for a certain distance with an initial torque value determined according to the initial conditions; (d) after step (c), issuing a control signal to the printing and drying unit 50 to control the printing and drying unit to operate (S4); (e) after step (d), receiving a sensing signal from the sensor (S5); (f') calculating the remaining amount of media in use using [Equation 5] to [Equation 9] from the sensing signal received in step (e) (S6); (g) After step (f'), is the remaining media length (ℓ) in use less than a certain value (ℓo)? A step of checking whether or not (S7); and (m) if the determination result in step (g) is 'N', then as the median torque value of the first motor 11 and the second motor 41 according to the condition suitable for the remaining media length (l) during use, Changing the control value (S12) and returning to step (c); It is characterized by including.

Preferably, the system for controlling the winding and withdrawal of the media roll for printing includes a tension adjustment unit 30 that adjusts the tension of the media drawn out from the drawer 10; It further includes, in the step (c), controlling the initial drive to a certain distance as the initial value of the tension value of the tension adjusting unit 30 determined according to the initial conditions, and in the step (m), the remaining media in use is controlled. In addition to the torque values of the first motor 11 and the second motor 41 according to conditions suitable for the length (l), the control value is changed as the intermediate value of the tension value of the tension adjustment unit, and the winding and withdrawal control method of the printing media roll (h) if the determination result in step (g) is 'Y', setting the tension value of the tension adjusting unit 30 to the maximum (S8); and (j) after step (h) above, is the remaining media expected to be terminated? determining whether or not (S9), and if so, terminating the entire process; otherwise, returning to step (c); It is characterized in that it further includes.

Also preferably, (k) before step (m), if the determination result in step (g) is 'N', is the length of the media used (Δℓ) greater than or equal to a certain value (ℓ ₁ )? A step of determining whether (S11); It further includes, and proceeds to step (m) of changing the control value only if the used media length (Δℓ) is more than a certain value (ℓ ₁ ). Otherwise, step (c) is performed directly without changing the control value. It is characterized by returning to .

According to the system and method for controlling the winding and withdrawal of media rolls for printing according to the present invention, the remaining amount of media (length and diameter) is very simply calculated using a rotary encoder mounted on the rotating shaft of the withdrawal roller, and the diameter and weight of the remaining media are calculated. Accordingly, the torque control of the winding roller and the take-out roller and the degree of tension of the media are optimally controlled, and the printer can be operated optimally by accurately predicting the completion of media use.

Meanwhile, additional features and advantages of the present invention will become clearer through the following description.

1 is a cross-sectional view of a general roll-type printed matter printer of the first prior art.
Figure 2 is a plan view of the fabric tension control device of the second prior art textile printer.
Figure 3 is a side view of the fabric tension control device of the second prior art textile printer.
Figure 4 is a perspective view of the main part of the fabric tension control device of the second prior art textile printer.
Figure 5 is a perspective view of an automatic printing roll fabric supply device of the third prior art.
Figure 6 is an enlarged plan view of the main part of the torque sensor of the roll fabric installation table of Figure 5.
Figure 7 is a schematic block diagram of a winding and withdrawal control system for a printing media roll according to an aspect of the present invention.
Figure 8 is a perspective view of one side of the roller portion of the winding and withdrawal control system for a printing media roll according to one aspect of the present invention.
Figure 9 is a perspective view of the other side of the roller unit of the winding and withdrawal control system for a printing media roll according to one aspect of the present invention.
Figure 10 is a cross-sectional schematic diagram of the roller portion of Figures 8 and 9.
FIG. 11 is a schematic diagram illustrating a formula for calculating media thickness and length from the cross-sectional view of the roller part of FIG. 10.
Figure 12 is a flow chart of a method for controlling the winding and withdrawal of a media roll for printing according to another aspect of the present invention.
Figure 13 is a flowchart of a method for controlling the winding and withdrawal of a media roll for printing according to a second embodiment of the present invention.
Figure 14 is a diagram illustrating the control method of the take-out and take-up roller of the take-up and take-out control method of a printing media roll according to the second embodiment of the present invention.
Figure 15 is a photo of the control panel of the take-out and take-up roller of the method for controlling the take-up and take-out of a printing media roll according to the second embodiment of the present invention.

The present invention will be described with reference to the accompanying drawings regarding preferred embodiments.

However, the embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as limited to the embodiments described in detail below, and should not be construed as limiting the scope of the present invention to those skilled in the art. It is provided for complete explanation.

Hereinafter, a system and method for controlling the winding and unloading of a printing media roll according to an aspect of the present invention will be described in detail with reference to FIGS. 7 to 12 of the attached drawings.

Figure 7 is a schematic block diagram of a winding and drawing control system for a printing media roll according to an aspect of the present invention, and Figure 8 is a perspective view of one side of the roller part of a winding and drawing control system for a printing media roll according to an aspect of the present invention. , Figure 9 is a perspective view of the other side of the roller unit of the winding and withdrawal control system for a printing media roll according to one aspect of the present invention.

Figure 10 is a cross-sectional schematic diagram of the roller part of Figures 8 and 9, Figure 11 is a schematic diagram showing the formula for calculating media thickness and length, etc. in the cross-sectional view of the roller part of Figure 10, and Figure 12 is a schematic diagram of the present invention. This is a flowchart of a method for controlling the winding and withdrawal of a printing media roll according to another aspect.

(Winding and withdrawal control system for printing media rolls)

First, referring to FIGS. 7 to 9, the winding and withdrawal control system 100 for a printing media roll according to one aspect of the present invention prints a predetermined pattern on the media 21 of the media roll 20 and dries it. A printing and drying unit 50 that performs the printing and drying unit 50, and a drawing unit 10 on which the media roll 20 is detachably mounted and where the media 21 is pulled out in response to the operation of the printer and supplied to the printing and drying unit 50. And, a winding unit 40 for winding the printed media 21 from the printing and drying unit 50, and a tension adjustment unit 30 for controlling the tension of the media drawn out from the drawing unit 10. A winding and withdrawal control system 100 for a printing media roll of a roll-type material printer, which receives a sensing signal from a rotary encoder sensor 16 that is mounted on the rotation axis 13 of the drawer 10 and detects rotational displacement. A sensor signal receiving unit 130 that processes signals; An input/output unit 120 that inputs and outputs information about the media role to the control system; The thickness and length of the media roll are calculated based on the information about the media roll input by the input/output unit 120 and the sensing information from the sensor signal receiver 130, and the first motor of the drawing unit 10 is based on this. (11) and the operation and control unit that controls the operation of the second motor 41 of the winding unit 40, as well as the tension regulator 32 of the tension control unit 30 and the printing and drying unit 50. (110); It is characterized by including.

Additionally, a database 140 that stores information about various media roles is provided.

More specifically, as shown in FIGS. 7 and 8, the draw-out unit 10 has a first motor 11 for driving the draw-out roller providing rotational force to the first rotation shaft 13 through the sprocket chain 12. This is transmitted, and the pull-out roller 15 is rotated through the axis of the bracket 14 (not shown). If necessary, a reducer (not shown) may be added in the middle. In addition, as shown in FIGS. 7 and 9, a bracket 14' is provided at the rear to accommodate the rear rotation shaft 13' of the first rotation shaft, and the rotary encoder 16 is installed on the rear rotation shaft 13'. is installed to convert the mechanical rotational displacement of the rotating shaft into an electrical pulse. For reference, the rotary encoder (16) is used in many fields, such as measuring the position, angle, and speed of mechanical devices or controlling the rotation speed and rotation amount of a motor. It is relatively inexpensive compared to other sensors and is provided in only one location. There is an advantage that it can be done.

In addition, a tension adjusting unit 30 is provided adjacent to the drawing unit 10. As shown in FIGS. 7 and 8, the media 21 is adjusted from the media roll 20 mounted on the drawing unit 10. ) is withdrawn and supplied in the direction of arrow "A" toward the winding unit 40 through the printing and drying unit 50, the tension control roller 31 maintains a constant tension by holding the media being drawn out, thereby maintaining the media This is to prevent wrinkles from forming, and at this time, the tension adjuster (31) pressurizes the tension control roller (32) using a known pressure pressure method such as a hydraulic cylinder method or a motor rotation method, and the media remaining wound on the media roll Since it must be controlled with different tension depending on the amount of media roll, it must be controlled to be able to pivot in the direction of arrow "B" to maintain appropriate tension at each time by the operation and control unit 110 of the media roll winding and withdrawal control system 100. desirable. That is, at the beginning of operation, there is a large amount of media wound and remaining in the media roll 20, so the tension adjustment roller 32 is located at the position shown by the solid line, but after use, the media remaining in the media roll 20 When the amount decreases, the tension control roller 32 moves to the position shown by the dotted line.

In the winding unit 40, similar to the drawing unit 10, the second motor 41 for driving the winding roller transmits rotational force to the second rotation shaft 43 through the sprocket chain 42, and the bracket The winding roller 45 is rotated through an axle (not shown). Also, if necessary, a reducer (not shown) can be added in the middle.

Unexplained symbols '17' and '47' are guide rollers.

Now, with reference to FIGS. 10 and 11, a method for calculating the thickness (t) and length (l) of the media 21 will be described in detail.

In order to calculate the thickness (t) of the first media roll of the newly installed media roll and the length (ℓ) of the media wound on the take-out roller, there is information that must be known first. First, the outer diameter (D) and inner diameter ( d) and overall length (L) information must be known. However, for this initial information, information provided by Media Roll manufacturers may be used.

Using this information (outer diameter, inner diameter, length information), the media thickness can be calculated. For reference, you can use the thickness information provided by the media manufacturer, but this thickness has low precision and does not match the dimensions of the printer according to the present invention, so an error occurs when calculating the remaining length (ℓ) of the media in use. Since this can occur significantly, it is advisable to recalculate it separately.

First, assuming that the outer diameter of the media roll is 'D' and the inner diameter is 'd', if one side of the media roll is cut and unfolded to calculate the media thickness, it is as shown in Figure 11 (a). In other words, it will be a trapezoid with the perimeter of the outer diameter (π·D) as the bottom and the circumference of the inner diameter (π·d) as the top.

Now, in the trapezoid shape of Figure 11 (a), if both triangle shapes are combined, it becomes a rectangle as shown in Figure 11 (b). If the width of this rectangle is 'X' and the length is 'Y', they become as follows [Equation 1] and [Equation 2].

[Equation 1]

X = perimeter (πd) + (πd) of the inner diameter (perimeter (πd) of the outer diameter -circumference (πd) of the inner diameter (πd)) / 2

[Equation 2]

Y = (Outside diameter (D) - Inside diameter (d)) / 2

And, by dividing the total media length (L) by the horizontal length (X), you can find out how many layers of media are stacked in the media roll. in other words,

[Equation 3]

n(number of repetitions of X) = total media length (L) / X

If the media thickness is calculated using the calculated X, Y, and n, it is as follows [Equation 4].

[Equation 4]

Media thickness (t) = Y / n

Meanwhile, the media is moved a certain distance (Δℓ) and the amount of change in the rotary encoder 16 mounted on the take-out roller rotation axis 13' of the take-out unit 10 is sensed and calculated to determine the amount of change remaining on the take-out roller 15. Calculate the amount of media. In other words, the amount of change in the rotary encoder 16 becomes the angle θ at which the media moves in the take-out roller 15. At this time, the moving distance Δℓ is as follows [Equation 5], so [Equation 5] From this, the perimeter of the outer diameter ((πD') and the outer diameter (D') can be obtained.

[Equation 5]

Moving distance (Δℓ) = Circumference of outer diameter (πD') * Moved angle (θ) / 2π = D'·θ/2

In other words, from the moving distance (Δℓ) and the angle (θ), the perimeter (πD') and the outer diameter (D') of the outer diameter can be known, and the outer diameter (D') and inner diameter (D') calculated from [Equation 5] above ( d) Using the media thickness (t) information, the length (ℓ) of the remaining media during use can be calculated. For reference, the inner diameter (d) and media thickness (t) information are considered unchanged.

First, the horizontal length (X') and vertical length (Y') of the remaining media roll while in use are equal to [Equation 6] and [Equation 7], respectively. At this time, from [Equation 5], the outer diameter (D') is = moving distance (Δℓ)/θ.

[Equation 6]

X '= circumference of the inner diameter (πd) + (perimeter of the outer diameter (πd')

[Equation 7]

Y' = (Outside diameter (D') - Inside diameter (d)) / 2

And, referring to (b) of FIG. 11, the vertical length (Y') of the remaining media roll during use is divided by the media thickness (t) to determine how many layers of media are piled on the remaining media roll during use. . However, the media thickness (t) may be a value provided by the media manufacturer, or a value previously calculated and stored in the database 140 may be used.

[Equation 8]

n' (number of repetitions of X') = Y' / media thickness (t)

Finally, from [Equation 3], the remaining media length (ℓ) during use can be obtained by the following [Equation 9].

[Equation 9]

Remaining media length in use (ℓ) = X' * n'

In conclusion, the media thickness (t) is calculated according to [Equation 1] to [Equation 4] from the information of the media roll during initial operation, and the first motor (stored in dB) (11) is determined according to the initial conditions. ) and the initial value of the torque of the second motor 41 and the initial value of the tension value of the tension control unit, the initial drive is performed for a certain distance, and then printing and drying are controlled, and during the second drive, the above [Equation 5] The amount of media remaining in use (here, length) is calculated according to Equation 9, and the torque value of the first motor 11 and the second motor 41 and the tension value of the tension adjusting unit are calculated according to the appropriate conditions. Secondary or more intermediate drives are performed for a certain distance (the torque of the first motor is increased, the torque of the second motor is reduced, and the tension value of the tension adjuster is increased), and finally, when there is not much media left (minimum If it is less than the set value (ℓo), the final drive is performed with the maximum tension value, and when the remaining media approaches zero (and/or when it approaches the expected end point, an alarm sounds), all drives are stopped.

Thus, the tension value of the media is always maintained constant on the printing unit, and the tension adjustment and finishing are automatically and smoothly performed even without a person personally observing it.

In particular, a technology to measure the amount of remaining media using a load cell has been proposed, but it is not suitable for large printers with a media roll diameter of 3 to 5 m because the load is too large. A method of measuring and controlling the diameter of the media roll has been devised, but as it requires high precision of about 0.2mm, which corresponds to the thickness of the media, it is also not suitable because it is too expensive to be adopted in a printer device, and is not suitable for optimal implementation of the present invention. In the example, this is possible with only one rotary encoder, so it has the advantage of being able to maintain tension relatively accurately while being economical. However, calculation of the amount of remaining media is not limited to rotary encoders, and it is also possible to use other similar sensors.

(How to control the winding and withdrawal of media rolls for printing)

Now, with primary reference to FIG. 12 and auxiliary reference to FIG. 7, a method for controlling the winding and unloading of a printing media roll according to the second aspect of the present invention will be described in detail.

First, when the new media roll 20 is installed and the method for controlling the winding and withdrawal of a printing media roll according to the present invention is started, the initial value is input through the input/output unit 120 of the control system 100 (S1). . Preferably, when the manufacturer or model name of the media roll is entered, the initial values (inner diameter (d), outer diameter (D), and total media length (L) of the media roll, etc.) are input using information stored in the database 140. do.

Now, the calculation and control unit 110 calculates the media thickness (t) (according to [Equation 1] to [Equation 4]) as described above (S2) and stores it in (dB) determined according to the initial conditions. ), the initial torque of the first motor 11 and the second motor 41 and the initial value of the tension value of the tension adjustment unit are initially driven for a certain distance (S3), and then a control signal is sent to the printing and drying unit 50. to start the printing and drying unit (S4).

Afterwards, for example, a sensing signal is received from the rotary encoder sensor 16 (S5), the signal is processed, and based on this, the amount of media remaining in use is calculated as described above (according to [Equation 5] to [Equation 9]). (here length) is calculated (S6), and is the remaining media length (ℓ) in use less than a certain value (ℓo)? This is checked (S7).

If the judgment result in step S7 is 'Y', after the tension value of the tension adjuster 30 is set to the maximum (S8), is the remaining media almost zero? It is determined (S9), and in that case, an alarm is sounded (so that one person can manage multiple printer devices) and the entire process is terminated.

Meanwhile, if it is determined that there is still media remaining as a result of the determination in step S9, the process returns to step S3 and printing is repeated.

On the other hand, if the determination result in step S7 is 'N', the control value is changed as the intermediate value of the torque value of the first motor 11 and the second motor 41 and the tension value of the tension adjusting unit according to the appropriate conditions. Afterwards (the torque of the first motor increases, the torque of the second motor decreases, and the tension value of the tension adjuster increases) (S12), it returns to step S3 to perform the second or more intermediate drive for a certain distance. .

For reference, before step S12, is the length of the media used (Δℓ) greater than a certain value (ℓ ₁ )? By adding a step (S11) to determine whether the used media length (Δℓ) is greater than a certain value (ℓ ₁ ), the control value is changed (S12). Otherwise, the control value is changed without changing the control value. It is more desirable to avoid unnecessary and too frequent control value changes by returning to step S3. Of course, even if step S11 is performed, if the constant value (ℓ ₁ ) is set to zero, more detailed control can be achieved by changing the control value each time.

(Second Embodiment)

Now, mainly referring to FIGS. 13 to 15, the winding and unloading control system of the printing media roll of the second embodiment of the present invention will be described.

Figure 13 is a flowchart of the method for controlling the winding and withdrawal of a printing media roll according to a second embodiment of the present invention, and Figure 14 is a flow chart of the method for controlling the winding and withdrawal of a printing media roll according to the second embodiment of the present invention. This is a diagram explaining the control method of the take-up roller, and Figure 15 is a photograph of the control panel of the take-out and take-up roller of the method for controlling the take-up and take-out of a printing media roll according to the second embodiment of the present invention.

The difference between this second embodiment and the above-described first embodiment is that the tension of the media is adjusted by controlling only the torque of the first and second motors. That is, the tension control unit only compensates for the fact that the media is pulled out by contacting the media roll, and does not separately fine-tune the tension of the tension control unit, and only the torque of the first motor and the second motor is controlled from the control panel of FIG. 15, respectively. By doing so, the tension of the media is kept constant.

To achieve this, as shown in FIG. 14, the torque of the first and second motors must be strictly adjusted to already verified values in the database. In Figure 14, the input values are media width, media thickness (or length), unwinder core radius, unwinder radius, and rewinder radius, and in order to keep the tension of the media constant, the unwinder and rewinder The torque values of the first motor and the second motor are increased and decreased in opposite directions (i.e., in FIG. 14, as the remaining media length after use decreases as shown in the yellow graph (as the length of the media wound up becomes longer as shown in the blue graph), the yellow graph As shown in the figure, the torque of the first motor of the take-out roller gradually decreases, and conversely, the torque of the second motor of the take-up roller gradually increases as shown in the gray graph), open-loop control by each table in a pre-written database (not shown) Make sure it is done in this way. However, for more precise control, it is more desirable to separately add a tension sensor and perform feedback control.

That is, the method for controlling the winding and withdrawal of a media roll for printing according to the second embodiment of the present invention receives an initial value through the input/output unit 120 of the control system 100 (S1), and the operation and control unit ( 110) calculates the media thickness (t) according to the above [Equation 1] to [Equation 4] (S2), and then, the first motor 11 and the second motor 41 determined according to the initial conditions. ), the initial torque is controlled to be driven for a certain distance (S3'), and then a control signal is sent to the printing and drying unit 50 to control the printing and drying unit to drive (S4), and a sensing signal is received from the sensor. By receiving (S5) and calculating the remaining media amount in use from the received sensing signal (S6), is the remaining media length (ℓ) in use almost zero? This is checked (S9). As a result of the determination, if it is 'N', the control value is changed to the intermediate torque value of the first motor 11 and the second motor 41 according to the condition suitable for the remaining media length (ℓ) during use (S12), Returns to step S3, and if 'Y', terminates the process.

Although the present invention has been described above according to an embodiment of the present invention, changes and modifications made by those skilled in the art without departing from the technical spirit of the present invention do not fall within the scope of the present invention. Of course.

(Invention: Figures 7 to 9)
10: Drawout part
11: first motor
12: sprocket chain
13,13': first rotation axis
14,14': Bracket
15: Take-out roller
16: rotary encoder
17: Guide roller
20: Media roll
21: Media
30: Tension adjustment unit
31: Tension adjuster
32: Tension adjustment roller
40: winding part
41: second motor
42: sprocket chain
43: second rotation axis
45: winding roller
47: Guide roller
50: Printing and drying section
100: Winding and withdrawal control system for printing media rolls
110: Operation and control unit
120: input/output unit
130: Sensor signal receiving unit
140: database

Claims (8)

A printing and drying unit 50 that prints a predetermined pattern on the media 21 of the media roll 20 and dries it, and the media roll 20 is detachably mounted and prints the media 21 in response to the operation of the printer. Printing media for a roll-type material printer including a drawing unit 10 from which the media 21 is pulled out and supplied to the printing and drying unit 50, and a winding unit 40 that winds the media 21 from the printing and drying unit 50. As a roll winding and withdrawal control system 100,
A sensor signal receiver 130 that receives a sensing signal from a sensor 16 mounted on the rotation shaft 13 of the drawer 10 and processes the rotational displacement;
An input/output unit 120 that inputs and outputs information about the media role to the control system; and
The thickness and length of the media roll are calculated based on the information about the media roll input by the input/output unit 120 and the sensing information from the sensor signal receiver 130, and the first motor of the drawing unit 10 is based on this. (11) and an operation and control unit 110 that controls the operation of the printing and drying unit 50 as well as the second motor 41 of the winding unit 40;
Includes,
The thickness (t) of the first media roll of the newly installed media roll is determined by the calculation and control unit 110 from the outer diameter (D), inner diameter (d), and total length (L) information of the media roll as follows [mathematics] It is calculated by [Equation 1] to [Equation 4],
The calculation and control unit controls the media to move by a certain distance (Δℓ) and senses the amount of change (θ) of the sensor that detects the rotational displacement mounted on the pull-out roller rotation axis 13' of the pull-out unit 10. and calculate the amount (l) of media remaining on the pull-out roller 15 from [Equation 5] to [Equation 9] below,
The calculation and control unit calculates the torque value of the first motor 11 and the second motor 41 of the drawing unit 10 and the winding unit 40 and the tension of the drawn media according to the amount (l) of the remaining media. A winding and withdrawal control system for printing media rolls, characterized in that it controls to adjust .
[Equation 1]
X = perimeter (πd) + (πd) of the inner diameter (perimeter (πd) of the outer diameter -circumference (πd) of the inner diameter (πd)) / 2
[Equation 2]
Y = (Outside diameter (D) - Inside diameter (d)) / 2
[Equation 3]
n(number of repetitions of X) = total media length (L) / X
[Equation 4]
Media thickness (t) = Y / n
[Equation 5]
Moving distance (Δℓ) = Circumference of outer diameter (πD') * Moved angle (θ) / 2π = D'·θ/2
[Equation 6]
X '= circumference of the inner diameter (πd) + (perimeter of the outer diameter (πd')
[Equation 7]
Y' = (Outside diameter (D') - Inside diameter (d)) / 2
[Equation 8]
n' (number of repetitions of X') = Y' / media thickness (t)
[Equation 9]
Remaining media length in use (ℓ) = X' * n' According to claim 1,
The sensor that detects the rotational displacement is a rotary encoder 16,
In the take-out unit 10, the first motor 11 for driving the take-out roller transmits rotational force to the first rotation shaft 13 through the sprocket chain 12, and the take-out roller ( 15) is rotated, and a rotary encoder 16 is mounted on the rear rotation axis 13' of the first rotation axis to convert the mechanical rotation displacement of the rotation axis into an electrical pulse. Winding and withdrawal control system. According to claim 1,
A tension adjusting unit 30 that adjusts the tension of the media drawn out from the drawing unit 10; It further includes,
The operation and control unit (110) controls the tension of the tension regulator (32) of the tension control unit (30). delete delete A method for controlling the winding and withdrawal of a printing media roll using the printing media roll winding and withdrawal control system of claim 1, comprising:
(a) receiving initial values for the outer diameter (D), inner diameter (d), and total length (L) information of the media roll through the input/output unit 120 of the control system 100 (S1);
(b) After step (a), the calculation and control unit 110 calculates the media thickness (t) according to [Equation 1] to [Equation 4] (S2);
(c) after step (b), controlling the first motor 11 and the second motor 41 to initially drive for a certain distance with an initial torque value determined according to initial conditions (S3);
(d) after step (c), issuing a control signal to the printing and drying unit 50 to control the printing and drying unit to operate (S4);
(e) after step (d), receiving a sensing signal from the sensor (S5);
(f) calculating the remaining amount of media in use using [Equation 5] to [Equation 9] from the sensing signal received in step (e) (S6);
(g) after step (f), a step (S7) of checking whether the remaining media length (ℓ) during use is less than a certain value (ℓo); and
(m) If the determination result in step (g) is 'N', control is performed as the intermediate torque value of the first motor 11 and the second motor 41 according to the conditions suitable for the remaining media length (ℓ) during use. changing the value (S12) and returning to step (c);
A method for controlling the winding and withdrawal of a media roll for printing, comprising: delete According to claim 6,
The winding and withdrawal control system for the printing media roll includes a tension adjustment unit 30 that adjusts the tension of the media pulled out from the drawer 10; It further includes,
In step (c), the initial tension value of the tension adjusting unit 30 is determined according to the initial conditions and is controlled to be initially driven for a certain distance,
In the step (m), the control value is changed as the intermediate tension value of the tension adjusting unit in addition to the torque value of the first motor 11 and the second motor 41 according to the conditions suitable for the remaining media length (l) during use. ,
The method for controlling the winding and withdrawal of the printing media roll is,
(h) If the determination result in step (g) is 'Y', setting the tension value of the tension adjusting unit 30 to the maximum (S8); and
(j) after step (h), determining whether the remaining media is expected to be terminated (S9), if so, terminating the entire process, otherwise returning to step (c);
A method for controlling the winding and withdrawal of a printing media roll, further comprising: