KR101240948B1 - Apparatus for keeping nip force between roll and substrate in roll printer - Google Patents

Abstract

PURPOSE: A device for maintaining a nip force between a roll of a roll printing device and a film is provided to regularly maintain the nip force by minimizing the changes in the nip force when a vertical cylinder moves up a blanket roll corresponding to the nip force being changed on a real-time basis. CONSTITUTION: A device for maintaining a nip force between a roll of a roll printing device and a film comprises a base(110), a pair of vertical cylinders(120), a pair of constant pressure regulator(130), and a lifting unit(140). The vertical cylinder supports both end portions of a rotary shaft of a blanket roll. The constant pressure regulator regularly maintains the pressure of each vertical cylinder. The lifting unit is installed in the base, thereby lifting the vertical cylinders. The blanket roll is stably lifted by lifting the guide members installed on both sides of the rotary shaft.

Description

Apparatus for keeping nip force between roll and substrate in roll printer}

The present invention relates to a roll printing apparatus for fine pattern printing, and more particularly, to a nip force holding device between the roll and the film of the roll printing machine to keep the nip force between the roll and the film during printing.

Printed electronics, which is one of the latest technologies, refers to an electronic device or an electronic product made by a printing process technique, which is a device printed by an automated process on a low-cost substrate.

Unlike the semiconductor method and the PCB manufacturing method, the printed electronics technology directly prints the circuit on the substrate, unlike the semiconductor method or the PCB manufacturing method, which forms a circuit through a complicated process such as exposure, deposition, etching, development, and cleaning in a vacuum environment. Not only can the entire process be drastically shortened, but there is no need to use the chemicals used in each treatment step, it is eco-friendly and prints as much as necessary, so it consumes less material than the conventional method. .

In addition, printed electronics technology is carried out in the air, not vacuum, it can significantly reduce the cost of the production equipment, and can be continuous work by the roll-to-roll method, up to 1/1000 compared to conventional manufacturing methods such as semiconductor or PCB This has the advantage of reducing production costs.

Such a conventional roll printing machine has a gravure plate to which ink is applied to the outer surface, a blanket roll which is disposed between the gravure plate and the film and moves up / down to transfer ink from the gravure plate to retransform into the film, and retransition. It is essentially provided with a film adsorption plate for fixing the film.

Here, since the blanket roll must retransfer the ink transferred from the gravure plate to the film, the contact with the film must be maintained at a constant force with the film at all times. This contact force is called nip force, and since nip force is generated through the action and reaction of the film and the blanket roll, when the nip force value changes, the force of the blanket roll (B) acting on the film is different. The thickness or width of the circuit printed on the film is not constant. Therefore, minimizing the change in nip force is a key to determining the quality of printing.

Nipforce varies due to a variety of factors, such as roundness error, cylindricalness error, concentricity error, gravure plate flatness, roll-out bearing run-out error, and so on. In this case, a change in nip force is shown directly. Therefore, it is urgent to manage the error which arises in the blanket roll B. FIG.

The error occurred in the blanket roll is the radial deviation of the blanket roll due to the swelling phenomenon that the blanket roll is partially swelled due to the thickness deviation of each position of the blanket roll and the solvent contained in the ink during repeated printing. And an axial alignment deviation between the blanket roll and the drive motor of the blanket roll.

In fact, the blanket rolls and surrounding components are all precision machined and assembled parts, so the above deviations are only very fine, a few microns. However, when the blanket roll is raised and lowered by 10 μm due to such errors in actual operation, the nip force acting on the film changes up to 1 Kgf, and when these errors overlap, the change of the nip force is inevitably intensified.

In addition, conventionally, when an error occurs in the blanket roll due to various causes as described above, both sides of the blanket roll are inclined finely without being simultaneously in contact with the film. In this case, the lifting and lowering of the blanket roll is unbalanced, and the nip force is caused. There was a problem that the initial setting of is not made precisely.

The present invention has been made to solve the above problems, the roll and film of the roll printing machine that can realize a high print quality by precisely setting the nip force as well as minimizing the nip force change generated during printing The purpose is to provide a liver nip force holding device.

In order to achieve the above object, the present invention provides a roll printing machine having a blanket roll for performing ink transfer and retransition between the gravure unit to which the ink is applied and the film adsorption plate, the base and both ends of the rotation axis of the blanket roll A pair of vertical cylinders for supporting the lifting and lowering, a pair of static pressure regulators for maintaining a constant pressure inside each vertical cylinder so that the blanket roll maintains a constant nip force during the transition and re-transition operation, and installed on the base And an elevating unit configured to elevate the vertical cylinder; The blanket roll allows the lifting and lowering is made stable through the lifting guide members installed on both sides of the rotating shaft; The elevating guide member is a support unit coupled to the elevating piece in a state in which it is mounted on the vertical support installed on the base, the elevating piece to be lifted along the vertical support received from the vertical cylinder and the rotary shaft of the blanket roll It may be configured as.

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In this case, it is preferable that a load cell for detecting a nip force is further installed between the bearing unit and the vertical cylinder.

On the other hand, the vertical cylinder is a single-actuated cylinder installed to face up and down through the lifting unit, a horizontal plate fixed to the lower end of the lifting piece or load cell between the single-acting cylinder and the single-acting cylinder may be disposed.

In addition, the elevating unit is provided on the base and the ball screw installed on the base, the base is provided to the reciprocating movement in the conveying direction of the blanket roll is given a moving force from the ball screw, and the top is inclined vertically up and down; And a lifting block which supports the vertical cylinder and is slidably coupled to an upper end of the moving tilt block to move up and down in place when the moving tilt block reciprocates.

In this case, it is preferable that a slider is mounted at the top and the bottom of the moving inclination block, respectively, and guide rails corresponding to the slider are installed on the bottom and the base of the lifting block.

In addition, the lower portion of the base may be further provided with a horizontal transfer unit so that the blanket roll can reciprocate between the gravure unit and the film adsorption plate along the transport path of the film.

According to the present invention configured as described above, since the vertical cylinder controlled to always maintain a constant internal pressure is configured to support the blanket roll and to be lifted by itself by a lifting unit, the vertical cylinder corresponds to a nip force that changes in real time. In addition to keeping the nip force constant while minimizing the change of the nip force while lifting the blanket roll, the lifting unit is forced to lower the vertical cylinder so that both sides of the blanket roll are in contact with the film. Since the setting is always made precisely, there is an effect that can realize a high print quality.

Figure 1 is a perspective view of the nip force holding and the roll and the film maintaining the synchronization device of the roll printer according to the invention.
2 is a front view of the present invention.
3 is a side view of the present invention.
Figure 4 is a cross-sectional perspective view of the main portion according to another embodiment of the vertical cylinder constituting the present invention.
Fig. 5 is a side view showing a state of use of the present invention, showing a state in which the blanket roll is moved to the gravure unit side.
Fig. 6 is a side view showing a state of use of the present invention, in which the blanket roll is lowered to transfer ink from the gravure unit.
Figure 7 is a side view of the state of use of the present invention, showing a state in which the blanket roll is moved to the film adsorption unit side.
Fig. 8 is a side view showing the state of use of the present invention, in which the blanket roll moves to the gravure unit side and re-transfers ink to the film.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims are to be interpreted in accordance with the technical idea of the present invention based on the principle that the inventor can properly define the concept of the term in order to explain his invention in the best way. It must be interpreted in terms of meaning and concept.

DETAILED DESCRIPTION Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. Like reference numerals refer to like elements, and only different parts will be mainly described so as not to overlap for clarity.

As shown in Figures 1 to 3, the nip force holding device between the roll and the film of the roll printing machine according to the present invention is the transfer of ink between the gravure unit (A) and the film adsorption plate (C) to which the ink is applied and It is applied to the roll printer 100 with the blanket roll (B) to perform the retransition.

The gravure unit A may be a plate-shaped gravure plate or a pattern roll in which an uneven pattern is imprinted on an outer circumferential surface thereof. In the present embodiment, for example, the gravure unit is a gravure plate.

According to the present invention, the base 110, a pair of vertical cylinders 120 for supporting both ends of the rotational axis of the blanket roll B, and a nip force in which the blanket roll B is constant during the transition and retransition operation are provided. It consists of a pair of positive pressure regulator 130 for maintaining a constant pressure in each vertical cylinder 120 to maintain, and a lifting unit 140 installed in the base 110 to raise and lower the vertical cylinder 120 do.

The base 110 may be fixed to the bottom, but as shown, the blanket roll (B) may perform ink transfer and retransition while reciprocating between the gravure unit (A) and the film adsorption plate (C). It may be installed. In this case, a horizontal transfer unit 150 is installed at the bottom to reciprocate between the gravure unit A and the film adsorption plate C along the film transfer path, and the base 110 is a horizontal transfer unit 150. ) Is installed on. In the present embodiment, a case where the horizontal transfer unit 150 is installed below the base 110 is illustrated and described.

The vertical cylinder 120 is installed on the lifting unit 140 and at the same time is installed to support the rotation axis of the blanket roll (B) to be able to lift. The vertical cylinder 120 reciprocates a predetermined section along the transfer path of the film together with the base 110.

The vertical cylinder 120 performs an operation of forcibly raising the blanket roll B so as to be spaced apart from the film when the transfer of the blanket roll B is completed. In addition, the vertical cylinder 120 performs an operation of forcibly lowering the blanket roll B to a predetermined height so that a constant nip force occurs before the transition and re-transfer operation of the blanket roll B is started.

On the other hand, the vertical cylinder 120 is connected to the pneumatic valve 121 and the constant pressure regulator 130 that can maintain a constant pressure inside the vertical cylinder 120 so that the supply of compressed air can be made selectively. .

Therefore, when compressed air is supplied into the vertical cylinder 120 at a specific pressure and then the pneumatic valve 121 is closed, the space between the interior of the vertical cylinder 120 and the pneumatic valve 121 in the vertical cylinder 120 is closed. Space becomes.

In addition, as the blanket roll B is raised or lowered for various reasons during the transition and re-transition operation, the nip force is changed. Accordingly, the displacement of the vertical cylinder 120 is changed while the enclosed space is compressed or expanded. Corresponding to this displacement Nipforce changes are reduced. The nip force eventually remains constant. This is to determine the displacement amount of the vertical cylinder 120 and the change amount of the nip force in accordance with the formula "pressure * volume = constant" with respect to the closed space, and the volume of the closed space before displacement of the vertical cylinder 120 and The amount of change of the nip force is determined by the ratio between the volumes of the closed spaces changed by the displacement of the vertical cylinder 120.

The static pressure regulator 130 serves to maintain a constant air pressure in the cylinder corresponding to the set reference value of the nip force. That is, when a nip force lighter than the weight of the blanket roll B is required, the vertical cylinder 120 is operated so that the blanket roll B is lifted from a printing pattern such as a film or a gravure unit A and vice versa. When a nip force larger than the weight of the blanket roll B is required, the vertical cylinder 120 is operated in the direction in which the blanket roll B is pressed against the printing pattern.

In addition, the blanket roll driving motor (M) is for aligning the position while rotating the blanket roll (B) forward and backward so that the blanket roll (B) is placed at a reference position when performing the transition and retransition operation. It is also possible to install an encoder (not shown) so that the position (B) rotates accurately.

On the other hand, the blanket roll (B) is preferably configured so that the lifting is stable through the lifting guide member 160 installed on the base 110.

The elevating guide member 160 is provided with a pair of vertical supports 161 respectively installed in the horizontal transfer unit 150 in the front-rear direction, and are provided with lifting force from the vertical cylinder 120 along the vertical supports 161. The lifting unit 162 may be configured to include a bearing unit 163 coupled to the lifting unit 162 while being mounted on the lifting shaft 162 and the rotating shaft of the blanket roll B. In this case, the upper end of the cylinder rod of the vertical cylinder 120 is fixed to the lower portion of the lifting piece 162 to support the blanket roll (B) at a constant pressure, the blanket roll driving motor (M) is a blanket roll It is connected to the rotating shaft of the blanket roll (B) in a state fixed to the bearing unit 163 to move up and down with (B).

The elevating unit 140 installed on the base 110 to elevate the vertical cylinder 120 is provided with a ball screw 141 installed on the base 110 and a moving force from the ball screw 141. It is installed on the base 110 so as to reciprocate in the conveying direction of the roll (B) and the moving inclination block 142 is formed to be inclined up and down, the vertical cylinder 120 and the moving inclination block 142 It is coupled to the upper end of the sliding movement of the inclination block 142 is composed of an elevating block 143 to move up and down in place when the reciprocating movement.

In this case, a slider 144 is mounted on the top and bottom of the moving tilt block 142, respectively, and a guide rail 145 corresponding to the slider 144 on the bottom and the base 110 of the lifting block 143. ) Can be installed.

When the lifting unit 140 sets the nip force pressure, the vertical cylinder 120 does not support the blanket roll (B) and is forced to descend excessively on the gravure unit (A) and the film adsorption plate (C). Let's do it. This allows both surfaces of the blanket roll (B) to be in contact with the film at the same time so that both sides of the blanket roll (B) are not in contact with the film at the same time for various reasons, and only one surface of the blanket roll (B) is in contact with the blanket roll (B). This is to prevent the phenomenon that the initial setting of the nip force is not made precisely while being inclined finely.

If one side of the blanket roll (B) is not lowered, not only does not generate a constant nip force on both sides of the blanket roll (B) but also the vertical cylinder 120 installed on one side may not detect the nip force at all. As a result, the pressure cannot be set to the desired nip force. In addition, since the excessive nip force is detected in the vertical cylinder 120 installed on the other side, normal pressure setting may not be made.

In addition, a load cell 170 for detecting a nip force may be further provided between the bearing unit 163 and the vertical cylinder 120. When the load cell 170 is installed, it is possible to grasp the change in the nip force in real time. Therefore, the operator can easily determine whether the nip force is normally controlled by recognizing the change of the nip force that changes during printing from the load cell 170, and through the nip force value that is identified through the load cell 170 before printing. Initial pressure setting of the vertical cylinder 120 to which the appropriate nip force may be applied to the blanket roll B may be performed very easily.

Reference numeral 122 is a power transmission panel for transmitting the lifting force of the lifting cylinder 120 to the load cell 170.

On the other hand, as another embodiment of the vertical cylinder 120, as shown in Figure 4, the vertical cylinder 120 is a pair of single-acting cylinder (120a) of the diaphragm (Diaphragm) type disposed facing up and down It may be done. This means that when the vertical cylinder 120 is double-acting, a large operating force is required due to the friction between the piston and the cylinder housing when operating up and down, so that the change in the nip force smaller than the operating friction force of the vertical cylinder 120 can be detected. This is to prevent the loss.

Therefore, the single acting cylinder 120a having a characteristic of low frictional force during operation is fixed to the elevating block 143 so as to face up and down, and is fixed between the single acting cylinder 120a and the bottom of the elevating piece (not shown) or the load cell 170. When the horizontal plate 125 is disposed, the single acting cylinders 120a may be sensitive to the minute nip force and control the nip force very precisely. In this case, the lifting block 143 has been changed in shape so as to fix the single-acting cylinder 120a, and each single-acting cylinder 120a shows only the pneumatic supply flow path 120b and the pneumatic hoses connected thereto are shown. Is omitted.

On the other hand, although not shown, when the load cell 170 is not installed, the horizontal plate 125 is disposed between the single-acting cylinder 120a and the single-acting cylinder 120a and fixed to the lower end of the elevating piece 162.

The nip force holding device of the roll printing machine of such a configuration is operated as follows.

First, the pressure of the vertical cylinder 120 is set so that an appropriate nip force is maintained between the blanket roll B and the film.

To this end, as shown in FIG. 5, the lifting unit 140 is operated while the blanket roll B is positioned on the gravure unit A, thereby forcibly lowering the blanket roll B below a predetermined height.

That is, when the ball screw 141 installed on the base 110 is operated in a state where the blanket roll B is positioned above the gravure unit A, the movement tilt block 142 moves rearward on the drawing while moving up and down. 143 is lowered along the inclined upper end of the moving inclination block 142, the vertical cylinder 120 is forcibly lowered along the descending lifting block 143, the blanket roll connected to the vertical cylinder 120 (B) is to fall along the vertical cylinder (120).

As such, when the blanket roll B is forcedly lowered, both sides of the blanket roll B are in contact with the film at the same time, and in the state in which both sides of the blanket roll B are in contact with the film, the lifting unit 140 is in the vertical cylinder 120. Even if it keeps descending, since the blanket roll B is supported by the gravure unit A of the film lower part, further fall is not made.

As described above, if both sides of the blanket roll (B) and the film is made in simultaneous contact, not only the pressure of the vertical cylinder 120 can be set so that an appropriate nip force is maintained between the blanket roll (B) and the film. The balanced lifting operation of the blanket roll B can be realized.

On the other hand, when the load cell 170 is installed, the operator can easily set the appropriate pressure to the vertical cylinder 120 while looking at the nip force measured in real time from the load cell 170.

When the nip force setting is completed, the horizontal transfer unit 150 transfers the blanket roll B to the front of the gravure unit A so that ink is transferred to the blanket roll B. FIG.

As shown in Fig. 6, when the blanket roll B arrives in front of the gravure unit A, the blanket roll driving motor M causes the specific direction of the blanket roll B to rotate forward and backward. After aligning the outer surface to the transition start position, the blanket roll B is forced down so that the vertical cylinder 120 is brought into close contact with the blanket roll B and the gravure unit A with a preset nip force. Then, the horizontal transfer unit 150 moves the blanket roll (B) to the rear. In this process, the ink of the gravure unit A is transferred to the outer surface of the blanket roll B.

When the transfer is completed, the vertical cylinder 120 forcibly raises the blanket roll B, and then, as shown in FIG. 7, the horizontal transfer unit 150 causes the blanket roll B to retransfer ink to the film. Is moved to the film adsorption plate (C) side. When the blanket roll B reaches the film adsorption plate C, the film adsorption plate C is adsorbed while the film transfer operation is stopped.

In addition, the vertical cylinder 120 lowers the blanket roll B so that the blanket roll B and the film closely adhere to each other with a proper nip force. At this time, the operator may control the positive pressure regulator 130 of the vertical cylinder 120 to reset the pressure of the vertical cylinder 120 to maintain a proper nip force. Then, the blanket roll driving motor M rotates the blanket roll B forward and reverse to align the specific outer surface of the blanket roll B with the repositioning start position.

When the alignment of the blanket roll B is completed, as shown in FIG. 8, the horizontal transfer unit 150 moves the blanket roll B forward, and in this process, the ink of the blanket roll B is filmed. It becomes a war.

When the retransition is completed, the vertical cylinder 120 raises the blanket roll B again. When the blanket roll B is raised, the transfer of the film is resumed, and as shown in FIG. 5, the horizontal transfer unit 150 moves the blanket roll B to the gravure unit A so that ink is transferred to the blanket roll B. As shown in FIG. The printing proceeds by repeating the above-described operations starting with transfer to the side.

As described above, preferred embodiments of the present invention are described above with reference to the drawings, but the present invention is not limited to the above-described embodiments, and those skilled in the art may modify the present invention without departing from the spirit of the present invention. Possible, such modifications will fall within the scope of the invention.

110 ... base 120 ... vertical cylinder
120a ... Single acting cylinder 125 ... Horizontal plate
130 ... static regulator 140 ... lift unit
141 Ball screw 142 Tilt block
143 Lifting Block 144 Slider
145 ... Information rail 150 ... Horizontal transport unit
160 ... Elevation guide member 161 ... Vertical support
162 ... Elevation 163 ... Bearing Units
170 ... Load cell A ... gravure unit
B ... Blanket roll C ... Film adsorption plate

Claims (8)

In a roll printing machine having a blanket roll for performing ink transfer and retransition between a gravure unit to which ink is applied and a film adsorption plate,
A base, a pair of vertical cylinders for lifting and supporting both ends of the rotating shaft of the blanket roll, and a pair for maintaining a constant pressure inside each vertical cylinder so that the blanket roll maintains a constant nip force during transition and re-transition operation. Comprising a positive pressure regulator of the, and the lifting unit is provided on the base for lifting the vertical cylinder,
The blanket roll allows the lifting and lowering to be stable through the lifting guide members installed on both sides of the rotation shaft;
A bearing unit coupled to the lifting piece in a state in which the lifting guide member is mounted on a vertical support provided on the base, a lifting piece lifting up along the vertical support by receiving lifting force from the vertical cylinder, and a rotating shaft of the blanket roll. A nip force holding device between the roll and the film of the roll printing machine, characterized in that consisting of. delete The method of claim 1,
A nip force holding device between the roll and the film of the roll printer, characterized in that a load cell for detecting the nip force is further installed between the bearing unit and the vertical cylinder. The method of claim 3, wherein
The vertical cylinder is a single-acting cylinder installed to face up and down through the lifting unit,
A nip force holding device between the roll and the film of the roll printing machine, characterized in that the horizontal plate is fixed between the single-acting cylinder and the single-acting cylinder is fixed to the lower end of the load cell. The method of claim 1,
The vertical cylinder is a single-acting cylinder installed to face up and down through the lifting unit,
A nip force holding device between the roll and the film of the roll printing machine, characterized in that the horizontal plate is fixed between the single cylinder and the single cylinder is fixed to the lower end of the lifting piece. The method of claim 1,
The elevating unit
A ball screw installed on the base;
A moving inclination block installed on the base so as to reciprocate in the conveying direction of the blanket roll by receiving a moving force from the ball screw and having an upper end inclined up and down;
A nip between the roll and the film of the roll printer, which supports the vertical cylinder and is configured to be slidably coupled to an upper end of the moving tilt block to move up and down in place when the moving tilt block reciprocates. Retaining device. The method according to claim 6,
Sliders are mounted on the top and bottom of the moving tilt block, respectively.
A nip force holding device between the roll and the film of the roll printer, characterized in that the guide rail corresponding to the slider is installed on the lower end and the base of the lifting block. The method of claim 1,
The lower portion of the base to maintain the nip force between the roll and the film of the roll printing machine, characterized in that the horizontal transfer unit is further installed so that the blanket roll reciprocating between the gravure unit and the film adsorption plate along the transport path of the film. Device.

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