CN114683677A - Intermittent printer and method for manufacturing printed matter using the intermittent printer - Google Patents

Abstract

An intermittent printer capable of grasping an actual tension value when a printing substrate traveling on a traveling path travels in a forward direction and a reverse direction, and a method for manufacturing a printed matter using the intermittent printer. The intermittent printing machine comprises an upstream side reverse roller (6), a downstream side reverse roller (10), a plurality of printing units and a plurality of delivery rollers arranged at the downstream side of each printing unit, wherein the intermittent printing machine is provided with a tension detector which is arranged at the upstream side of each printing unit and the downstream side of a final printing unit and detects the tension value of a printed substrate (W); and a monitor (120) for displaying at least the detected tension value of the upstream-side reverse roller (6), the downstream-side reverse roller (10), the pressure cylinder (9), and the transport roller during forward rotation and the detected tension value during reverse rotation, respectively, detected by the tension detector.

Description

Intermittent printer and method for manufacturing printed matter using the intermittent printer

Technical Field

The present invention relates to an intermittent printing press and a method of manufacturing a printed matter using the intermittent printing press, wherein the intermittent printing press includes a plurality of printing units between back rollers, and prints an image while moving a printed substrate in a forward direction by rotating the back rollers and a pressure cylinder in a forward direction, and after printing, the back rollers and the pressure cylinder are rotated in a reverse direction to move the printed substrate only in the reverse direction by a length of the printed substrate determined so as not to print the image on the printed substrate, and after moving in the reverse direction, the back rollers and the pressure cylinder are rotated in the forward direction again to move the printed substrate in the forward direction to print the image on the printed substrate with a small gap in the vertical direction by repeating the above processes.

Background

An intermittent printing machine includes a plurality of printing units between an upstream reverse roller and a downstream reverse roller, wherein the upstream reverse roller and the downstream reverse roller are rotated in the forward direction to print an image while the printing substrate is moved in the forward direction, after printing, the upstream reverse roller and the downstream reverse roller are rotated in the reverse direction to move the printing substrate only in the reverse direction by a length of the printing substrate determined so as not to print an image on the printing substrate, and after moving in the reverse direction, the upstream reverse roller and the downstream reverse roller are rotated in the forward direction again to move the printing substrate in the forward direction to print an image on the printing substrate with a gap in the up-down direction (a direction parallel to the moving direction of the printing substrate) reduced.

As such an intermittent printing press, for example, a variable printing press is known which is described in japanese patent application laid-open No. 2006-247869 (referred to as patent document 1) in which a plurality of printing units each having a plate cylinder, a rubber blanket cylinder, and a platen cylinder are arranged in a horizontal direction between a pair of feed rollers (corresponding to an upstream-side reverse roller and a downstream-side reverse roller of the present invention) which can synchronously rotate forward and reverse, the outer periphery of the rubber blanket cylinder is constituted by a large diameter portion and a small diameter portion, and a rubber blanket is attached to the peripheral surface of the large diameter portion (see fig. 1 of patent document 1).

In this variable printing press, printing of an image having a length in the vertical direction shorter than the circumference of the large diameter portion of the blanket cylinder is repeated in the vertical direction, and printing is continuously performed on a continuous paper (corresponding to the substrate to be printed of the present invention), in which case, during continuous rotation of the blanket cylinder, the continuous paper is advanced at a constant speed over the circumference of the large diameter portion of the blanket cylinder by the action of a pair of feed rollers (corresponding to traveling in the forward direction of the present invention), during the forward traveling, printing of an image is performed on the continuous paper by the large diameter portion of the blanket cylinder and the press cylinder, and after printing, during a non-restraint state (so-called "retreat") in which the circumference of the small diameter portion of the blanket cylinder is opposed to the press cylinder, the continuous paper is advanced only in a non-image range in the reverse direction, and traveling in the reverse direction between printing and retreat of the image is sequentially repeated, the rubber blanket cylinders of the printing units repeat printing of images in the vertical direction on the continuous paper without gaps every 1 rotation.

However, in this variable printing press, since the paper passage (corresponding to the traveling passage of the present invention) between the pair of feed rollers is formed in a straight line, when the continuous paper is opposed to the small diameter portion of the rubber-lined fabric sleeve in the return step of traveling the continuous paper in the reverse direction, the continuous paper in the paper passage between the pair of feed rollers is in an unconfined state in which no nip is instantaneously applied over the entire length.

In this way, in the state in which the continuous paper is continuously nipped and the retracted state in which the continuous paper is not nipped in the case of repeating the forward rotation printing, the continuous paper in the paper passing path between the pair of feed rollers is likely to be deviated due to slack or the like, particularly in the central portion of the continuous paper in the paper passing path, and the tension value of the continuous paper is also unstable, and the continuous paper is likely to travel in a meandering manner.

In order to eliminate the variation of the continuous paper and the instability of the tension value, a variable printing press having guide rollers on the upstream side and the downstream side of each printing unit of the variable printing press has been proposed.

For example, a variable printing press has been proposed in which a platen of a printing unit disposed between a pair of feed rollers is rotated in synchronization with the pair of feed rollers, and guide rollers for winding a continuous paper passing through between a rubber-lined cloth liner and the platen to the platen over a predetermined winding angle are disposed on at least one of the upstream side and the downstream side of each platen (see fig. 2 of patent document 1).

With this structure in which the continuous paper roll is suspended on the platen, the continuous paper is not in a free state between the pair of feed rollers, and the occurrence of tension value instability due to a deviation caused by slack in the continuous paper that repeats forward traveling and reverse traveling is prevented.

Disclosure of Invention

In a conventional intermittent printer in which cylinders of a plurality of printing units disposed between an upstream-side reverse roller and a downstream-side reverse roller can be rotated in synchronization with the upstream-side reverse roller and the downstream-side reverse roller, a difference may occur in tension value of a printing target substrate traveling in a traveling path between the upstream-side reverse roller and the printing unit, in tension value of the printing target substrate traveling in a traveling path between the plurality of printing units, and in tension value of the printing target substrate further traveling in a traveling path between the printing unit and the downstream-side reverse roller due to influences of individual differences (manufacturing errors), mechanical losses, and the like of components of each printing unit.

Due to this difference in tension value, the tension value of the printing substrate becomes a value unsuitable for printing, and the following problems arise: a problem such as a shift in the printing position (shift in printing registration) of each printing unit occurs.

In order to eliminate this problem and suppress the deviation of the printing registration, it is conceivable to cause the printing substrate to travel at a stable appropriate tension value by appropriately setting the respective rotational speeds of the upstream-side reverse roller, the downstream-side reverse roller, and the platen so that the tension value of the printing substrate traveling on the respective travel paths between the upstream-side reverse roller and the downstream-side reverse roller including the plurality of printing units becomes an appropriate value.

In particular, in an intermittent printer that moves a printing substrate in the forward and reverse directions, it is possible to appropriately set appropriate rotation speeds of the upstream-side reverse roller, the downstream-side reverse roller, and the platen in consideration of the fact that the tension value of the printing substrate moving in each of the traveling paths between the upstream-side reverse roller and the downstream-side reverse roller including a plurality of printing units can be controlled in a stable state when the printing substrate moves in the forward direction and when the printing substrate moves in the reverse direction.

Further, in the intermittent printing press, the tension value of the printing target substrate traveling on each traveling path between the upstream-side reverse roller and the downstream-side reverse roller including the plurality of printing units is unstable due to various conditions of the printing target substrate, and there is a case where a deviation in printing registration occurs.

That is, the properties such as stretch ratio and friction of the printed base material are different depending on the material, width and thickness. Because of this difference in properties, the appropriate tension value in printing differs in each printed substrate.

For example, when the width-direction dimension (dimension in a direction perpendicular to the traveling direction) of the printing substrate is small, when the thickness of the printing substrate is thin, or when the printing substrate is a film, the printing substrate expands and contracts in the traveling direction due to the tension applied to the printing substrate, and is likely to shrink in the width direction, and the higher the tension value of the printing substrate, the larger the expansion and contraction. This may cause a deviation in printing registration.

In order to eliminate this, it is conceivable to adjust the tension value of the printing substrate when the printing substrate travels in the forward direction and the reverse direction to a value that offsets the conditions of the printing substrate in order to suppress the deviation of the printing registration.

However, in the conventional intermittent printing machine, there is no means for checking the tension value of the printing target substrate traveling on each traveling path between the upstream-side reverse roller and the downstream-side reverse roller including the plurality of printing units, and therefore it is impossible to know whether or not the actual tension value of the printing target substrate is an appropriate value during printing.

Therefore, as described above, the actual tension value of the printing substrate cannot be adjusted to a value that offsets various conditions of the printing substrate, and the printing operation is repeated a plurality of times while changing the rotation speeds of the upstream-side reverse roller, the platen, and the downstream-side reverse roller until there is no deviation in the printing registration.

The present invention has been made to solve the above-described problems, and an object thereof is to provide an intermittent printing press capable of grasping an actual tension value when a printing target substrate traveling in a forward direction and a reverse direction on a traveling path between an upstream reverse roller and a downstream reverse roller including a plurality of printing units travels, and capable of achieving a state in which there is no deviation in printing registration in a short time, and a printed matter manufacturing method using the intermittent printing press.

The intermittent printing machine of the invention is provided with an upstream side reverse roller; a downstream-side reverse roller; a plurality of printing units arranged between the upstream-side reverse roller and the downstream-side reverse roller in a traveling direction of the printing substrate; and a plurality of transport rollers provided on a downstream side of each of the printing units, wherein the intermittent printing press prints by repeating a process in which the upstream-side reverse roller, the downstream-side reverse roller, and a platen of the printing unit and the transport rollers are rotated in the forward direction while the printing target substrate is moved in the forward direction to print an image, and after the printing, the upstream-side reverse roller, the downstream-side reverse roller, and the platen and the transport rollers are rotated in the reverse direction to move the printing target substrate only in the reverse direction by a length of the printing target substrate determined so as not to perform printing of an image on the printing target substrate, and after the printing is moved in the reverse direction, the upstream-side reverse roller, the downstream-side reverse roller, and the platen and the transport rollers are rotated in the forward direction again to perform printing, a tension detector provided upstream of each of the printing units and downstream of a final printing unit for detecting tension values of the printing substrate, and a monitor for displaying detected tension values of at least the upstream-side reverse roller, the downstream-side reverse roller, the platen, and the transport roller during normal rotation, which are detected by the tension detector; and detected tension values of the upstream-side reverse roller, the downstream-side reverse roller, the platen, and the transport roller during reverse rotation.

In the intermittent printer of the present invention, the monitor displays the detected tension value detected by the tension detector at a timing specified based on at least one of a printing start point, an intermediate point during printing, a printing end point, a switching point from normal rotation to reverse rotation, an intermediate point during reverse rotation, and a switching point from reverse rotation to normal rotation during one rotation of the blanket liner of the printing unit with reference to at least 1 rotation of the upstream-side reverse roller, the downstream-side reverse roller, the platen, and the transport rollers.

In the intermittent printer of the present invention, the detected tension value displayed on the monitor is an average value of the measured tension values at a plurality of times in the past at the predetermined timing.

With the intermittent printer of this configuration, the actual tension value of the printing substrate can be set to a more accurate and appropriate value.

The intermittent printer of the present invention includes a control device that calculates a correction amount of a rotation speed of a drive motor of the transport roller based on a detected tension value detected by the tension detector and a set tension value that is an appropriate value at which printing registration deviation does not occur, and controls the rotation speed of the drive motor that rotates the transport roller based on the calculated correction amount so that the detected tension value becomes the set tension value.

According to the intermittent printer having this configuration, the actual tension value of the printing substrate can be automatically set to the set tension value, and therefore, even when the tension value of the printing substrate fluctuates during traveling, the control amount of the rotation speed of the drive motor can be automatically corrected.

In the intermittent printer of the present invention, the substrate to be printed is a plastic film.

In the intermittent printer of the present invention, the substrate to be printed is selected from 1 of polyester, polypropylene, polyethylene, and nylon.

In the intermittent printer of the present invention, the thickness of the printing substrate is 5 to 200 μm.

In the intermittent printer of the present invention, a drying device for drying the ink printed on the substrate to be printed is disposed in each printing unit.

In the intermittent printer of the present invention, the drying device is a system for drying the ink by irradiating the ink with an active energy ray.

A method for manufacturing a printed matter using the intermittent printer according to any one of claims 1 to 9.

In the method for producing a printed matter using the intermittent printer of the present invention, the number of sheets per one minute of the intermittent printer is 10 to 300.

In the method for producing a printed matter using the intermittent printer of the present invention, the intermittent printer used for producing a flexible package printed matter is used.

In the method for manufacturing a printed matter using the intermittent printer of the present invention, printing is performed by adjusting the measured value of the tension of the printed matter traveling upstream of each printing unit of the intermittent printer and downstream of the final printing unit so that the measured value becomes a set value.

According to the intermittent printer of the present invention, it is possible to grasp an actual tension value when the printing substrate travels in the forward direction or the reverse direction on the traveling path between the upstream reverse roller and the downstream reverse roller including the plurality of printing units. Therefore, the state without the deviation of the printing registration can be made in a short time.

According to the method for producing a printed matter using the intermittent printer of the present invention, a printed matter free from variations in printing registration can be obtained regardless of various conditions of components of the printing unit (manufacturing errors), mechanical loss, and a substrate to be printed.

Drawings

Fig. 1 is an overall front view showing an embodiment of an intermittent printer according to the present invention.

Fig. 2 is an enlarged front view of a feeding section and a sheet feeding section of the intermittent printer shown in fig. 1.

Fig. 3 is an enlarged front view of a paper discharge section and a post-processing section of the intermittent printer shown in fig. 1.

Fig. 4 is a partially enlarged front view of 2 printing units of the intermittent printer shown in fig. 1.

Fig. 5 is an explanatory diagram of the operation from the start of printing to the end of printing in the first printing of the printing unit.

Fig. 6 is an explanatory diagram of the operation of the printing unit from the end of the first printing to the start of the second printing.

Fig. 7 is an explanatory diagram of the operation from the start of printing to the end of printing in the second printing.

Fig. 8 is an enlarged front view of a first tension detector mounting portion of the intermittent printer shown in fig. 1.

Fig. 9 is a left side view, partially in cross-section, of the first tension detector mounting portion shown in fig. 8.

Fig. 10 is a schematic diagram of a tension value control device of the intermittent printer according to the present embodiment.

Fig. 11 is an enlarged explanatory view of the monitor shown in fig. 10.

Fig. 12 is a diagram showing a timing of taking in a detected tension value in a graph of a rotation speed ratio of the pressing drum with respect to a rotation angle of the rubber-lined fabric drum.

Detailed Description

The overall structure of the intermittent printer of the present invention is explained based on fig. 1.

Fig. 1 is an overall front view of an embodiment of an intermittent printer according to the present invention.

As shown in fig. 1, the intermittent printing press 100 according to the embodiment of the present invention includes a supply unit 1A that supplies a printing substrate W; a paper feeding section 1B for feeding out the printed substrate W supplied from the supply section 1A; a printing section 2 including a drying device for drying and fixing the ink printed on the substrate W to be printed, the drying device printing an image on the substrate W to be printed fed from the paper feeding section 1B; a paper discharge unit 3A that discharges a printed substrate W on which an image is printed (hereinafter simply referred to as a printed substrate W); and a post-processing section 3B for performing post-processing on the printing substrate W.

In the embodiment of the present invention, the supply unit 1A is a take-out device 4 that supplies the printing substrate W.

The sheet feeding unit 1B includes a sheet feeding unit buffer 5 for accumulating the printing substrate W fed from the feeding unit 1A in a loop shape, and an upstream reverse roller 6 for running the printing substrate W accumulated in the sheet feeding unit buffer 5. In the embodiment of the present invention, the paper inlet portion 1B side is set as the upstream, and the paper outlet portion 3A side is set as the downstream.

The printing section 2 has a plurality of printing units. A plastic film is used as the substrate W to be printed, and as an example of the case of using the plastic film, there are provided a first printing unit 2a that performs printing using ink of a black (K) color; a second printing unit 2b for printing with ink of cyan (C) color; a third printing unit 2c for printing with ink of magenta (M) color; a fourth printing unit 2d for printing with ink of a color of yellow (Y); a fifth printing unit 2e for performing white full printing; and a sixth printing unit 2 f. The first printing unit 2a is the first printing unit, the second to fifth printing units 2b to 2e are intermediate printing units, and the sixth printing unit 2f is the final printing unit.

In the first to fourth printing units 2a to 2d, color printing of different colors is performed on the printing substrate W. After the color printing, the fifth and sixth printing units 2e and 2f perform white full-color printing on the printing substrate W.

Color printing is performed by visually checking the side of the substrate W to be printed on the side opposite to the printing surface side. All white is used as a background color for improving the visual confirmation of color printing.

The 6 first to sixth printing units 2a, 2b, 2c, 2d, 2e, 2f have the same structure, and include 3 cylinders of a plate cylinder 7, a blanket cylinder 8, and a platen cylinder 9. In the present embodiment, the length of the circumference of the plate cylinder 7, the length of the circumference of the blanket cylinder 8, and the length of the circumference of the platen cylinder 9 are the same.

The sheet discharge unit 3A includes a downstream reverse roller 10 for running the printing substrate W, and a sheet discharge unit buffer 11 for accumulating the printing substrate W running on the downstream reverse roller 10 in a loop.

The post-processing unit 3B is a winding device 12 that winds the printing substrate W accumulated in the sheet discharge unit buffer 11.

The supply unit 1A and the sheet feeding unit 1B shown in fig. 1 will be described in detail with reference to fig. 2. Fig. 2 is an enlarged front view of a feeding section and a sheet feeding section of the intermittent printer shown in fig. 1.

As shown in fig. 2, the unwinding device 4 includes a supply shaft 20 on which a printing substrate W wound in a roll shape is mounted; a feed roller 21 that discharges and feeds out the printing target substrate W attached to the feed shaft 20; a corona treatment device 24, which is provided on a traveling path 23 of the printing substrate W from the supply shaft 20 to the feed roller 21 and which will be described in detail later; a supply section tension detection device 25; and a meandering travel prevention device 26. That is, the unwinding device 4 is provided from the supply shaft 20 to the feed roller 21.

A powder brake, not shown, is connected to the supply shaft 20, and can impart rotational resistance to the supply shaft 20.

The printing substrate W fed from the supply shaft 20 is wound around the circumferential surface of the feed roller 21. A drive motor (not shown) is connected to the feed roller 21, and the feed roller 21 is rotationally driven by the drive motor only in a direction in which the printing substrate W is fed out (clockwise direction in fig. 2).

The feed roller 21 is not rotationally driven in a direction opposite to the direction in which the printing substrate W is fed (counterclockwise direction in fig. 2).

At least 1 grip roller 22 is pressed against the peripheral surface of the feed roller 21. By nipping the printing substrate W between the nip roller 22 and the feed roller 21 and rotationally driving the feed roller 21 by a drive motor not shown, the printing substrate W can be stretched, the feed shaft 20 can be rotated, and the roll-shaped printing substrate W can be fed out and reliably fed toward the paper feed portion buffer 5. The grip roller 22 is pressed against the circumferential surface of the feed roller 21 within a range in which the printing substrate W is wound.

When the printing substrate W is discharged, the supply shaft 20 rotates, but since the powder brake applies a rotational resistance to the supply shaft 20, a tension having a value that offsets the magnitude of the rotational resistance (braking force) is generated in the printing substrate W.

The corona treatment device 24 performs corona treatment on the surface of the substrate W to be printed. By performing the corona treatment, the surface of the substrate W to be printed is modified, and the fixing property of the ink to the substrate W to be printed is improved.

The supply section tension detection device 25 detects a tension value of the printing substrate W discharged from the supply shaft 20 at the supply section 1A.

The detected tension value of the supply unit 1A is compared with a set tension value of the supply unit 1A by a supply unit control device, not shown.

The supply unit control device can adjust the braking force of the powder brake so that the detected tension value at the supply unit 1A and the set tension value at the supply unit 1A match, and can normally discharge the printing substrate W at the set tension value at the supply unit 1A.

The meandering preventing device 26 detects the position of the printing substrate W in the width direction, and moves the printing substrate W in the width direction as the position in the predetermined width direction when the position deviates from the predetermined position.

This prevents the printed substrate W from being positionally displaced in the width direction. The width direction of the printing substrate W is a direction perpendicular to the discharge direction.

The sheet inlet buffer 5 includes an upwardly recessed portion 5a such as a box having an open upper portion and a suction device (not shown) for sucking air in the upwardly recessed portion 5a, and the air in the upwardly recessed portion 5a is sucked by the suction device, whereby the printing substrate W is sucked into the upwardly recessed portion 5a and accumulated in a ring shape. The suction force of the suction device is controlled so as to be a tension with which the printing substrate W accumulated in the upper concave portion 5a does not meander.

The rotation speed of the feed roller 21 is controlled in accordance with the output of a sensor (not shown) attached to the buffer device 5 so that the length of the printing substrate W stored in the upper concave portion 5a falls within a predetermined range.

The upstream reverse roller 6 includes 2 driving rollers 27 driven to rotate forward and backward by a driving motor not shown, and at least 2 pinch rollers 28 pressed against the circumferential surfaces of the driving rollers 27. The 2 driving rollers 27 are provided at intervals in the vertical direction.

The printing substrate W travels in a reverse S-shape around 2 driving rollers 27, and is nipped by the driving rollers 27 and the nip roller 28. The 2 grip rollers 28 are pressed against positions spaced apart in the rotational direction within a range in which the printing substrate W is wound around the peripheral surface of the driving roller 27.

Therefore, the printing substrate W can be reliably moved in the forward and reverse directions by driving the driving roller 27 in the forward and reverse directions.

In the present embodiment, the supply unit 1A (the winding-out device 4) and the sheet feeding unit 1B (the sheet feeding unit buffer 5 and the upstream-side reverse roller 6) are 1 unit, but the present invention is not limited thereto.

For example, the supply unit 1A (the unwinding device 4) may be set as 1 unit, and the sheet feeding unit 1B (the sheet feeding unit buffer 5 and the upstream-side reverse roller 6) may be set as 1 unit. In this case, it is preferable to provide a feed roller on the supply side of the sheet feeding section buffer 5. That is, in the feeding section 1A and the sheet feeding section 1B shown in fig. 2, the feed roller 21 of the feeding section 1A also serves as the feed roller of the sheet feeding section buffer 5.

The sheet discharging unit 3A and the post-processing unit 3B shown in fig. 1 will be described in detail based on fig. 3. Fig. 3 is an enlarged front view of a paper discharge section and a post-processing section of the intermittent printer shown in fig. 1.

As shown in fig. 3, the downstream reverse roller 10 includes 2 driving rollers 30 that are driven to rotate forward and backward by a driving motor, not shown, and at least 2 pinch rollers 31 that are pressed against the circumferential surfaces of the driving rollers 30. The 2 driving rollers 30 are provided at intervals in the vertical direction.

The printing substrate W travels in a winding manner so as to form an S-shape over 2 driving rollers 30, and is nipped by each of the driving rollers 30 and the nip roller 31. The 2 pinch rollers 31 are pressed against positions spaced apart in the rotational direction in a range in which the printing substrate W is wound around the circumferential surface of the drive roller 30.

Therefore, the printing substrate W can be reliably moved in the forward and reverse directions by driving the driving roller 30 in the forward and reverse directions.

The downstream reverse roller 10 (drive roller 30) and the upstream reverse roller 6 (drive roller 27) are driven to rotate in the forward and reverse directions in synchronization with each other. In the present embodiment, synchronization means that the timing at which each driving roller starts forward rotation driving and reverse rotation driving and the timing at which each driving roller ends acceleration and starts deceleration coincide with each other.

An upward recessed portion 11a in which the sheet discharge portion buffer 11 has a box with an open upper portion; a suction device (not shown) for sucking air in the upper recess 11 a; and a feed roller 33 for feeding the printing substrate W toward the post-processing section 3B, wherein the suction device sucks the air in the upper concave 11a, thereby absorbing the printing substrate W into the upper concave 11a and accumulating the air in a ring shape.

The suction force of the suction device is controlled so as to be a tension with which the printing substrate W accumulated in the upper concave portion 11a does not meander.

The rotation speed of the feed roller 33 is controlled in accordance with the output of a sensor (not shown) attached to the sheet discharge unit buffer 11 so that the length of the printing substrate W stored in the upper concave portion 11a falls within a predetermined range.

The printing substrate W discharged from the sheet discharge portion buffer 11 is wound around the circumferential surface of the feed roller 33. A drive motor (not shown) is connected to the feed roller 33, and the feed roller 33 is rotationally driven by the drive motor only in a direction (clockwise direction in fig. 3) in which the printing target substrate W is fed toward the post-processing section 3B, and is not rotationally driven in a direction (counterclockwise direction in fig. 3) opposite to the direction in which the printing target substrate W is fed toward the post-processing section 3B.

At least 2 grip rollers 34 are pressed against the peripheral surface of the feed roller 33. By nipping the printing substrate W between the nip roller 34 and the feed roller 33 and rotationally driving the feed roller 33 by a drive motor, not shown, the printing substrate W can be stretched and reliably fed toward the post-processing section 3B.

The 2 grip rollers 34 are pressed against positions spaced apart in the rotational direction in the range around which the printing substrate W is wound on the circumferential surface of the feed roller 33.

The winding device 12 includes a winding shaft 32 for winding the printing substrate W and a post-processing unit tension detection device 36 described later.

A drive motor (not shown) is connected to one end of the winding shaft 32, and the winding shaft 32 is rotationally driven by the drive motor only in a direction in which the printing substrate W is to be wound (clockwise in fig. 3), and is not rotationally driven in a direction opposite to the winding direction (counterclockwise in fig. 3).

The post-processing-section tension detecting device 36 is provided on a traveling path 35 of the printing substrate W from the feed roller 33 to the take-up shaft 32, and detects a tension value of the post-processing section 3B of the printing substrate W traveling on the traveling path 35.

The detected tension value of the post-processing section 3B detected by the post-processing section tension detecting device 36 is compared with a set tension value of the post-processing section 3B set by a post-processing section control device, not shown, and the rotation speeds of the take-up shaft 32 and the feed roller 33 are controlled so that the detected tension value of the post-processing section 3B becomes the set tension value of the post-processing section 3B.

The post-processing section 3B is not limited to the winding device 12.

For example, a processing device that processes the printed substrate W, a unit that conveys the printed substrate W to another device provided on the downstream side, a delivery unit, and the like can be used as the post-processing section 3B.

An automatic registration device 38 and a monitoring device 39 are provided on a traveling path 37 of the printing substrate W between the downstream reverse roller 10 and the printing portion 2 (sixth printing unit 2 f).

The automatic registration device 38 reads the dots printed on the printing substrate W by the printing units 2a to 2f, measures the pitches between the dots, finds the deviation of the printing registration of the printing units 2a to 2f, and performs fine adjustment of the printing registration during the printing operation. The fine adjustment of the printing registration by the automatic registration device 38 is performed by automatically controlling the printing units 2a to 2f based on information of the printing press set in advance.

The monitoring device 39 includes a camera unit 39a for capturing an image printed on the printing substrate W and a monitor, not shown, for displaying the captured image as an image.

The registration marks of the respective colors printed on the printing substrate W by the respective printing units 2a to 2f are captured by the camera unit 39a and displayed on the monitor as images. Since the operator can know which print unit is out of vertical print registration and which print unit is out of horizontal print registration by viewing the image on the monitor, the operator can correct the out of vertical print registration and the out of horizontal print registration manually.

The printing unit shown in fig. 1 is described in detail based on fig. 4. Fig. 4 is a partially enlarged front view of 2 printing units of the intermittent printer shown in fig. 1.

As shown in fig. 4, the plate cylinder 7, the rubber blanket cylinder 8, and the platen cylinder 9 of the printing unit (first printing unit 2A), and the members described later are provided in the machine frame 2A of the printing unit, respectively, but the cylinders and the members are illustrated by solid lines for easy understanding.

The platen 7 and the rubber-lined cloth cylinder 8 are driven to rotate in opposite directions (arrow directions in fig. 4) in synchronization with each other by 1 drive motor (not shown).

The platen 9 is driven to rotate forward and backward in synchronization with the upstream reverse roller 6 and the downstream reverse roller 10 by a drive motor for the platen, not shown.

Guide rollers 40 and 41 for winding the printing substrate W around the platen 9 over a predetermined winding angle are provided on the upstream side and the downstream side of the platen 9. The guide rollers 40 and 41 are driven to rotate in accordance with the travel of the printing substrate W.

The platen 9 is provided with a nip roller 42 for pressing the printing substrate W against the circumferential surface of the platen 9. Since the printing substrate W is pressed against the circumferential surface of the platen 9 by the nip roller 42, the printing substrate W travels in the forward and reverse directions following the forward and reverse rotations of the platen 9.

Between the machine frame 2A of the first printing unit 2A and the machine frame 2A of the second printing unit 2b, a machine frame 80A for a registration adjustment device is provided, and the machine frame 80A for a registration adjustment device is provided with the registration adjustment device 80. The register adjusting device 80 is located between the first printing unit 2a and the second printing unit 2 b.

The registration adjusting device 80 adjusts the printing registration by changing the length of the traveling path 85a of the printing substrate W between the first printing unit 2a and the second printing unit 2b by moving the movable roller 83 within the range indicated by the reference numerals 83a and 83 b. In the present embodiment, the movement of the movable roller 83 is performed before the printing operation, and the movement of the movable roller 83 is not performed during the printing operation.

Further, a first conveying roller 81a and a second conveying roller 81b are provided in the registration adjusting device machine frame 80A. The first conveyance roller 81a is disposed upstream of the registration adjusting device 80 (on the first printing unit 2a side of the movable roller 83), and the second conveyance roller 81b is disposed downstream of the registration adjusting device 80 (on the second printing unit 2b side of the movable roller 83). The first and second conveyance rollers 81a and 81b are conveyance rollers on the downstream side of the first printing unit 2a in the present embodiment.

The first and second conveyance rollers 81a and 81b each have a separate drive motor and rotate forward and backward in synchronization with the upstream reverse roller 6 and the downstream reverse roller 10. As will be described later, the rotation speed is controlled by the control device 110 in accordance with the actual tension value of the printing substrate W.

The first and second transport rollers 81a and 81b are provided with pinch rollers 86 and 87, respectively, for pressing the printing substrate W against the circumferential surfaces of the first and second transport rollers 81a and 81 b.

Since the printing substrate W is pressed against the circumferential surfaces of the first and second conveyance rollers 81a and 81b by the nip rollers 86 and 87, the printing substrate W is conveyed while following the forward and backward rotation of the first and second conveyance rollers 81a and 81 b.

As shown in fig. 4, a drying device 43 is provided to face a portion of the circumferential surface of the platen 9 of the first printing unit 2a around which the printing substrate W is wound. The drying device 43 is provided in the second to sixth printing units 2b to 2f (see fig. 1) in the same manner as the first printing unit 2 a.

In the present embodiment, an ink dried by an active energy ray is used as the ink to be printed on the printing substrate W. Therefore, the drying device 43 uses a drying device of a system for drying the ink by irradiating the active energy ray.

By providing the drying device 43 in each of the printing units 2a to 2f, the ink can be dried before the printing surface of the printing target substrate W comes into contact with the guide roller 41 provided to wind the printing target substrate W around the platen 9. Therefore, the printed surface of the printing substrate W is in contact with the guide roller 41 after the ink of the printed image is fixed and dried, and therefore, there is no image disturbance.

As shown in fig. 1, a registration adjusting device 80 is also provided between the second printing unit 2b and the third printing unit 2c, and here, a third conveyance roller 81c is provided on the upstream side of the registration adjusting device 80 and a fourth conveyance roller 81d is provided on the downstream side. A registration adjusting device 80 is also provided between the third printing unit 2c and the fourth printing unit 2d, and a fifth conveyance roller 81e is provided on the upstream side of the registration adjusting device 80 and a sixth conveyance roller 81f is provided on the downstream side.

A registration adjustment device 80 is also provided between the fourth printing unit 2d and the fifth printing unit 2e, and a seventh conveyance roller 81g is provided on the upstream side of the registration adjustment device 80 and an eighth conveyance roller 81h is provided on the downstream side. A registration adjustment device 80 is also provided between the fifth printing unit 2e and the sixth printing unit 2f, where a ninth conveyance roller 81i is provided on the upstream side of the registration adjustment device 80 and a tenth conveyance roller 81j is provided on the downstream side.

Further, an eleventh conveyance roller 81k is provided downstream of the sixth printing unit 2 f.

In the present embodiment, the third and fourth transport rollers 81c and 81d are transport rollers on the downstream side of the second printing unit 2b, the fifth and sixth transport rollers 81e and 81f are transport rollers on the downstream side of the third printing unit 2c, and the seventh and eighth transport rollers 81g and 81h are transport rollers on the downstream side of the fourth printing unit 2 d.

Further, the ninth and tenth transport rollers 81i and 81j are transport rollers on the downstream side of the fifth printing unit 2e, and the eleventh transport roller 81k is a transport roller on the downstream side of the sixth printing unit 2 f.

The third to eleventh conveyance rollers 81c to 81k also have separate drive motors as in the first and second conveyance rollers 81a and 81b, and rotate forward and backward in synchronization with the upstream reverse roller 6 and the downstream reverse roller 10. As will be described later, the rotation speed is controlled by the control device 110 in accordance with the actual tension value of the printing substrate W.

Like the first and second transport rollers 81a and 81b, the third to eleventh transport rollers 81c to 81k are provided with pinch rollers 86 and 87, respectively, for pressing the printing substrate W against the circumferential surfaces of the third to eleventh transport rollers 81c to 81 k. Since the printing target substrate W is pressed against the peripheral surfaces of the third to eleventh transfer rollers 81c to 81k by the nip rollers 86 and 87, the printing target substrate W travels while following the forward and reverse rotations of the third to eleventh transfer rollers 81c to 81 k.

That is, transport rollers for moving the printing substrate W in the forward direction and the reverse direction are provided downstream of the printing units 2a to 2 f.

The basic printing operation of the intermittent printer 100 according to the present embodiment is as follows.

In the intermittent printer 100 according to the present embodiment, a servo motor is used as a drive motor for rotating the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9 of each of the printing units 2a to 2f, and the first to eleventh conveyance rollers 81a to 81k in the forward and reverse directions.

In a state where the printing substrates W are respectively accumulated in the paper feed portion buffer 5 and the paper discharge portion buffer 11 in an annular shape, the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9 of each of the printing units 2a to 2f, and the first to eleventh transport rollers 81a to 81k are driven to rotate in a forward direction in synchronization with the synchronization control of a conventionally known servo motor, and the printing substrates W are moved in the forward direction (the direction from the paper feed portion 1B toward the paper discharge portion 3A) while printing images. For example, the technique of synchronous control disclosed in japanese patent laid-open No. 2-75561 can be utilized.

After printing, the upstream reverse roller 6, the downstream reverse roller 10, the pressure cylinder 9 of each of the printing units 2a to 2f, and the first to eleventh transport rollers 81a to 81k are reversely driven in synchronization, so that the printing target substrate W travels in the reverse direction (the direction from the paper discharge unit 3A toward the paper feed unit 1B), and the position in the vertical direction is adjusted so that the rear end of the printed image becomes the next printing start position.

Then, the upstream reverse roller 6, the downstream reverse roller 10, the platen 9 of each of the printing units 2a to 2f, and the first to eleventh transport rollers 81a to 81k are driven to rotate in the positive direction, and the image is printed while the printing substrate W is moved in the positive direction.

The operation of printing an image by moving the printing substrate W in the forward direction and the operation of adjusting the print start position by moving the printing substrate W in the reverse direction are repeated, and the image is printed on the printing substrate W with the gap in the vertical direction reduced.

That is, the basic printing operation of the intermittent printer 100 according to the present embodiment is the same as the basic printing operation of the conventional intermittent printer.

The intermittent printing operation of the intermittent printer 100 according to the present embodiment will be described in detail with reference to fig. 5, 6, and 7. Fig. 5 is an explanatory view of an operation from the start of printing to the end of printing in the first printing of the printing unit, fig. 6 is an explanatory view of an operation from the end of the first printing to the start of the second printing of the printing unit, and fig. 7 is an explanatory view of an operation from the start of printing to the end of printing in the second printing.

The first printing operation is as follows.

The plate cylinder 7 and the blanket cylinder 8 are continuously driven to rotate at the same speed in opposite directions (clockwise direction of the plate cylinder 7 and counterclockwise direction of the blanket cylinder 8) as indicated by solid arrows in the intermittent printing operation.

The platen 9 rotates clockwise, that is, rotates forward as indicated by the solid arrow, and moves the printing substrate W forward as indicated by the solid arrow, and rotates counterclockwise, that is, rotates backward, and moves the printing substrate W backward as indicated by the broken arrow. In this case, in fig. 5, 6, and 7, the upstream-side reverse roller 6, the downstream-side reverse roller 10, and the first to eleventh transport rollers 81a to 81k, which are not shown, are rotated in the forward direction and in the reverse direction in synchronization with the platen 9.

The operation from the start of printing to the end of printing in the first printing (printing of the first page) will be described with reference to fig. 5.

As shown in fig. 5(a), the printing substrate W travels in the forward direction by the forward rotation of the platen 9, and after the leading end 8a-1 of the rubber blanket 8a of the rubber blanket cylinder 8 comes into contact with the printing substrate W in contact with the circumferential surface of the platen 9, the ink adhering to the rubber blanket 8a is transferred to the printing substrate W, thereby starting printing of the image of the rubber blanket 8a on the printing substrate W. The leading end 8a-1 of the rubber interlining 8a refers to the end on the downstream side in the rotation direction of the rubber interlining 8 a.

The platen 9 is rotated forward at a constant speed equal to the speed of the blanket cylinder 8 from the state of the start of printing, and the blanket cylinder 8 and the platen 9 are rotated to print the first image sequentially from the blanket 8a to the printing substrate W as shown in fig. 5 (b).

Fig. 5(b) shows the time when the first half of printing is finished.

As shown in fig. 5(c), the transfer from the rubber blanket 8a to the printing substrate W is completed, and the first printing is completed by the contact of the trailing end 8a-2 of the rubber blanket 8a with the printing substrate W in contact with the circumferential surface of the platen 9. The rear end 8a-2 of the rubber interlining 8a is an end on the upstream side in the rotation direction of the rubber interlining 8 a.

That is, the upstream reverse roller 6 and the downstream reverse roller 10, and the platen 9 and the first to eleventh transfer rollers 81a to 81k are rotated in the forward direction at a constant speed in synchronization with each other, and the blanket 8a is brought into contact with the printing substrate W while the printing substrate W is moved in the forward direction at a constant speed, whereby the image of the blanket 8a is first printed on the printing substrate W.

The rotation angle α of the rubber-lined cloth cylinder 8 is an angle formed by a straight line b connecting a rotation center 8b of the rubber-lined cloth cylinder 8 and a rotation center 9c of the platen 9 and a rear end 8a-2 of the rubber-lined cloth 8a, and the position of the rear end 8a-2 at the end of printing is defined as 0 degree and the positive rotation direction is defined as positive.

The rotation angle β of the platen 9 is an angle formed by the straight line b and the rear end G-1 of the print image G printed on the print target substrate W, and the position of the rear end G-1 at the end of printing is defined as 0 degrees, and the positive rotation direction is defined as positive.

The rotation angle from the straight line b of the blanket cylinder 8 to the leading end 8a-1 of the blanket 8a at the end of printing is a first blanket cylinder rotation angle α 1, and the rotation angle from the straight line b of the platen cylinder 9 to the leading end G-2 of the printed image G is a first platen rotation angle β 1. The rubber blanket cylinder 8 and the platen cylinder 9 rotate at the same speed, and α 1 and β 1 are at the same angle when the vertical length of the rubber blanket 8a is the same as the vertical length of the print image G.

Since the platen 9 is rotated positively at a constant speed at the end of printing as shown in fig. 5(c), the platen 9 is rotated positively at a reduced speed after the end of printing to gradually stop the rotation of the platen 9, thereby preventing the occurrence of slippage between the printing target substrate W and the peripheral surface of the platen 9 and preventing a failure in a drive system of the platen 9 or the like.

In order to stop the rotation of the platen 9 gradually after the printing is completed, the platen 9 stops rotating at a position rotated positively by a predetermined rotation angle from the position at the time of completion of the printing shown in fig. 5(c) as shown in fig. 5 (d). That is, the rotation angle β of the platen 9 at the stop rotation position is the second platen rotation angle β 2.

In a state where the platen 9 stops rotating, as shown in fig. 5(d), the rotation angle α of the rubber blanket cylinder 8 is the second rubber blanket cylinder rotation angle α 2.

The rotation angle alpha 2 of the second rubber lining cloth cylinder is larger than the rotation angle beta 2 of the second pressing cylinder. That is, the rubber blanket cylinder 8 also rotates at a constant speed after the printing is completed, but the platen cylinder 9 rotates in a decelerating positive direction after the printing is completed, so α 2 > β 2.

The operations from the first printing end (printing end of the first page) to the second printing (printing of the 2 nd page) are as follows.

The operation from the end of the first printing to the start of the second printing (printing on page 2) will be described with reference to fig. 6.

As shown in fig. 6(a), the platen 9, which stops rotating after the first printing operation is completed, performs accelerated reverse rotation as indicated by the broken-line arrow, and the printing substrate W travels in the reverse direction as indicated by the broken-line arrow.

As shown in fig. 6(b), the platen 9 is reversely rotated by only the second platen rotation angle β 2, and when the trailing edge G-1 of the print image G first printed on the print substrate W is moved to the position at the end of printing, the platen 9 is set to a predetermined reverse rotation speed. The predetermined reverse rotation speed is the fastest reverse rotation speed, and is a speed slower than a constant speed during printing (see fig. 12).

The rotation angle α of the rubber blanket cylinder 8 in the state shown in fig. 6(b) is the third rubber blanket cylinder rotation angle α 3. Since the rubber-lined cloth bobbin 8 is rotationally driven at a constant speed, α 3 > α 2.

After the pressure cylinder 9 reaches the predetermined reverse rotation speed, the pressure cylinder 9 is decelerated and reversely rotated to gradually stop the rotation of the pressure cylinder 9. In the state where the platen 9 stops rotating, as shown in fig. 6(c), the rotation angle β of the platen 9 is a position shifted from the position at the end of printing toward the paper feeding portion 1B by the third platen rotation angle β 3.

The third barrel rotation angle β 3 is the same as the second barrel rotation angle β 2.

The rotation angle α of the rubber blanket cylinder 8 is rotated until the fourth rubber blanket cylinder rotation angle α 4(α 4 > α 3) and the leading end 8a-1 of the rubber blanket 8a approaches the printing start position of the platen 9. The angle formed by the front end 8a-1 of the rubber lining cloth 8a and the straight line b is the fifth rubber lining cloth cylinder rotation angle alpha 5.

The upstream-side reverse roller 6, the downstream-side reverse roller 10, and the first to eleventh transport rollers 81a to 81k are rotationally driven in the same manner as the platen 9.

As shown in fig. 6 a to 6 c, the printing substrate W travels toward the paper inlet 1B (travels in the reverse direction) through a gap between the circumferential surface portion of the blanket 8a, to which the blanket cylinder 8 is not attached, and the circumferential surface of the press cylinder 9.

As shown in fig. 6(c), the platen 9 is rotated forward while being accelerated from the state where the platen 9 stops rotating after the above-described deceleration and reverse rotation, and the platen 9 is gradually rotated forward, whereby the printing substrate W is moved forward.

Then, if the platen 9 is driven to rotate positively at a rotation angle β of only the third platen rotation angle β 3, the leading end 8a-1 of the rubber blanket 8a comes into contact with the trailing end G-1 of the print image G as shown in fig. 6 (d).

In a state where the leading end 8a-1 of the rubber blanket 8a is in contact with the trailing end G-1 of the print image G, the platen 9 is rotated normally at the same constant speed as the rubber blanket cylinder 8 to start the second printing.

The upstream-side reverse roller 6, the downstream-side reverse roller 10, and the first to eleventh transport rollers 81a to 81k are rotated in the same manner as the platen 9.

Therefore, the rubber blanket cylinder 8 rotates 1 revolution (360 degrees) at the time of the first printing. During the rotation of the blanket cylinder 8 for 1 rotation, the platen cylinder 9 rotates in the forward direction by the length of the blanket 8a rotating in the vertical direction during printing.

The second printing (printing operation for page 2) is as follows.

The operation from the start of printing to the end of printing when the second printing (printing on page 2) is performed will be described with reference to fig. 7.

As shown in fig. 7(a), in a state where the rear end G-1 of the print image G to be printed first and the front end 8a-1 of the blanket 8a are in contact with each other, the platen 9 is rotated forward at the same constant speed as the blanket cylinder 8 to start the second printing. As shown in FIG. 7(b), the leading edge H-2 of the second printed image H is continuous with the trailing edge G-1 of the first printed image G.

If the platen 9 is rotated only by the first platen rotation angle β 1, the second printing is completed with the rear end H-1 of the second printed image H and the rear end 8a-2 of the blanket 8a coinciding with each other as shown in fig. 7 (c).

When the platen 9 is rotated in the decelerating positive direction from the second printing end state, the platen 9 is rotated by the second platen rotation angle β 2 to stop the rotation, as shown in fig. 7 (d). That is, the second printing is performed in the same manner as the first printing.

The third and subsequent printing (printing on pages 3 and 2) is performed in the same manner as the second printing (printing on page 2).

Next, the detection of the tension value acting on the printing substrate W will be described. In this description, the upstream side and the downstream side are the paper inlet portion 1B side and the paper discharge portion 3A side, respectively.

As shown in fig. 1, a first tension detector Pa is provided on the upstream side of the platen 9 of the first printing unit 2 a. The first tension detector Pa detects a tension value of the printing substrate W traveling on a traveling path between the paper feeding unit 1B and the first printing unit 2a (specifically, a traveling path between the upstream reverse roller 6 and the platen 9 of the first printing unit 2 a). The first tension detector Pa is provided on the downstream side with respect to the upstream-side reverse roller 6.

A second tension detector Pb is provided on the upstream side of the platen 9 of the second printing unit 2 b. The second tension detector Pb detects a tension value of the printing target substrate W traveling in the traveling path between the first printing unit 2a and the second printing unit 2b (specifically, the traveling path between the platen 9 of the first printing unit 2a and the platen 9 of the second printing unit 2 b). The second tension detector Pb is disposed downstream of the first and second conveyance rollers 81a and 81 b.

A third tension detector Pc is provided on the upstream side of the platen 9 of the third printing unit 2 c. The third tension detector Pc detects a tension value of the printing substrate W traveling in the traveling path between the second printing unit 2b and the third printing unit 2c (specifically, the traveling path between the platen 9 of the second printing unit 2b and the platen 9 of the third printing unit 2 c). The third tension detector Pc is disposed downstream of the third and fourth conveyance rollers 81c and 81 d.

The fourth tension detector Pd is provided on the upstream side of the platen 9 of the fourth printing unit 2 d. The fourth tension detector Pd detects a tension value of the printing substrate W traveling on the traveling path between the third printing unit 2c and the fourth printing unit 2d (specifically, the traveling path between the platen 9 of the third printing unit 2c and the platen 9 of the fourth printing unit 2 d). The fourth tension detector Pd is provided downstream of the fifth and sixth conveyance rollers 81e and 81 f.

A fifth tension detector Pe is provided on the upstream side of the platen 9 of the fifth printing unit 2 e. The fifth tension detector Pe detects a tension value of the printing target substrate W traveling in the traveling path between the fourth printing unit 2d and the fifth printing unit 2e (specifically, the traveling path between the platen 9 of the fourth printing unit 2d and the platen 9 of the fifth printing unit 2 e). The fifth tension detector Pe is disposed downstream of the seventh and eighth conveyance rollers 81g and 81 h.

A sixth tension detector Pf is provided on the upstream side of the platen 9 of the sixth printing unit 2 f. The sixth tension detector Pf detects a tension value of the printing target substrate W traveling on the traveling path between the fifth printing unit 2e and the sixth printing unit 2f (specifically, the traveling path between the platen 9 of the fifth printing unit 2e and the platen 9 of the sixth printing unit 2 f). The sixth tension detector Pf is provided downstream of the ninth and tenth conveyance rollers 81i and 81 j.

A seventh tension detector Pg is provided on the downstream side of the platen 9 of the sixth printing unit 2 f. The seventh tension detector Pg detects a tension value of the printing substrate W traveling on the traveling path between the sixth printing unit 2f and the sheet discharge unit 3A (specifically, the traveling path between the platen 9 and the downstream reverse roller 10 of the sixth printing unit 2 f). The seventh tension detector Pg is disposed on the downstream side with respect to the eleventh conveyance roller 81 k.

That is, the intermittent printer 100 according to the present embodiment includes first to sixth tension detectors Pa to Pf that detect the tension values of the printing target substrate W traveling on the upstream side of the platen 9 of the respective printing units 2a to 2f, and a seventh tension detector Pg that detects the tension value of the printing target substrate W traveling on the downstream side of the platen 9 of the sixth printing unit 2 f.

Each of the tension detectors Pa to Pg outputs a detected tension value bN to the control device 110 described later.

The mounting of the tension detectors Pa to Pg will be described.

As shown in fig. 2, the first tension detector Pa is attached to a machine frame 90A and supports the printing substrate guide roller 90.

The mounting of the first tension detector Pa is explained in detail based on fig. 8 and 9. Fig. 8 is an enlarged front view of the first tension detector mounting portion shown in fig. 2, and fig. 9 is a left side view of the first tension detector mounting portion shown in fig. 8, partially cut away. Note that, since the first tension detector Pa is provided in the machine casing 90A, it is not visible when viewed from the front, and is illustrated by a broken line in fig. 8, but is illustrated by a solid line in fig. 2 for easy understanding.

The machine frame 90A has a pair of frames 91 facing each other in a direction perpendicular to the traveling direction of the printing substrate W, and brackets 92 are attached to the pair of frames 91 by bolts 93. The first tension detectors Pa are flange-shaped having mounting flanges, and a pair of the first tension detectors Pa are mounted on the respective brackets 92 by bolts 94.

The printing substrate guide roller 90 is rotatably attached across the pair of first tension detectors Pa, and winds the printing substrate W.

That is, flange-shaped first tension detectors Pa are provided on both sides of the printing substrate guide roller 90 on which the printing substrate W is wound, and the first tension detectors Pa are attached to the machine frame 90A via the bracket 92 in a state of supporting the printing substrate guide roller 90 provided on the upstream side of the platen 9 of the first printing unit 2 a.

As shown in fig. 4, the second tension detector Pb is attached to the registration adjusting machine frame 80A, and the registration adjusting device 80 supports the registration adjusting device printing substrate guide roller 84 on which the printing substrate W is wound.

Since the second tension detector Pb is attached to the frame 80A for the registration adjustment device in the same manner as the first tension detector Pa is attached to the frame 90A, in fig. 8 and 9, the frame 80A for the registration adjustment device, the second tension detector Pb, and the reference numerals of the guide roller 84 for the registration adjustment device for the printing substrate are added in parentheses, and detailed description thereof is omitted.

The third tension detector Pc, the fourth tension detector Pd, the fifth tension detector Pe, and the sixth tension detector Pf are attached to the registration adjustment device machine frame 80A of the registration adjustment device 80 in the same manner as the second tension detector Pb.

As shown in fig. 3, the seventh tension detector Pg is attached to the machine frame 90B via a bracket in a state where the to-be-printed substrate guide roller 90 provided between the platen 9 and the sheet discharge portion 3A (downstream-side retracting roller 10) of the sixth printing unit 2f is supported similarly to the first tension detector Pa.

The first and seventh tension detectors Pa and Pg output voltages proportional to the load applied to the printing substrate guide roller 90 to the control device 110 described later.

The second to sixth tension detectors Pb to Pf output voltages proportional to the load applied to the printing substrate guide roller 84 for the registration adjusting device to the control device 110.

That is, when the tension of the printing substrate W changes, the load applied to the printing substrate guide roller 90 and the registration adjustment device printing substrate guide roller 84 also changes. The voltages output from the first to seventh tension detectors Pa to Pg change in direct proportion to the change in the load. Since the value of the output voltage is proportional to the detected tension bN, the first to seventh tension detectors Pa to Pg can detect a change in the tension of the printing substrate W.

In the present embodiment, the tension detectors Pa to Pg are provided on the printing substrate guide roller 90 and the registration adjusting device printing substrate guide roller 84, but the positions where the tension detectors Pa to Pg are provided are not limited to this. The flange-shaped tension detector may be any guide roller as long as the substrate W is wound at a predetermined angle. A known tension detector other than the flange type may be used.

A tension value control device for controlling a tension value in the printing section 2 of the intermittent printer 100 according to the present embodiment will be described with reference to fig. 10. Fig. 10 is a schematic diagram of a tension value control device of the intermittent printer according to the present embodiment.

As shown in fig. 10, the first to seventh tension detectors Pa to Pg are connected to a control device 110, and the control device 110 is connected to the upstream reverse roller 6, the downstream reverse roller 10, the platen 9 of each of the printing units 2a to 2f, the drive motor M for rotating the first to eleventh transport rollers 81a to 81k, and the monitor 120. Connecting refers to transferring signals. That is, the first to seventh tension detectors Pa to Pg, the control device 110, and the monitor 120 constitute a tension value control device.

The first to seventh tension detectors Pa to Pg continuously output the detected tension value bN to the control device 110 as an analog signal.

The control device 110 converts the detected tension bN output as an analog signal into a digital signal by a built-in PLC (programmable logic controller), and outputs the digital signal to the monitor 120 as the detected tension bN at a predetermined timing by the input entry-time signal R.

Further, the control device 110 controls the rotation speed of the drive motor M of the upstream reverse roller 6, the drive motor M of the platen 9 of each of the printing units 2a to 2f, the drive motors M of the first to eleventh conveyance rollers 81a to 81k, and the drive motor M of the downstream reverse roller 10, respectively, based on the input motor rotation speed control signal S. Therefore, the rotation speeds of the upstream-side reverse roller 6, the downstream-side reverse roller 10, and the platen 9 and the first to eleventh transport rollers 81a to 81k of the printing units 2a to 2f can be independently controlled.

The machine signal R at the time of taking in includes a machine signal R1 at the time of normal rotation output when the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k rotate in the normal direction and the print substrate W travels in the normal direction, and a machine signal R2 at the time of reverse rotation output when the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k rotate in the reverse direction and the print substrate W travels in the reverse direction.

The normal rotation time taking-in timing signal R1 and the reverse rotation time taking-in timing signal R2 are output by detecting the rotation of 1 of the upstream reverse roller 6, the downstream reverse roller 10, the blanket cylinder 8, the platen 9, and the first to eleventh transport rollers 81a to 81 k.

The controller 110 outputs the detected tension value bN at the time of forward rotation of the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k, that is, the detected tension value at the time of forward rotation to the monitor 120 if the forward-rotation-time entry-time machine signal R1 is input, and outputs the detected tension value bN at the time of reverse rotation of the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k, that is, the detected tension value at the time of reverse rotation to the monitor 120 if the reverse-rotation-time entry-time machine signal R2 is input.

The control device 110 is, for example, a CPU (central processing unit), and may be used as a control device for controlling the entire intermittent printer 100, instead of being a dedicated control device for the tension value control device.

The detected tension value bN means the tension detected by the nth tension detector from the number of supply sides. When the number of the tension detectors is 7, the value of N is 1 to 7.

In the present embodiment, the tension value detected by the first tension detector Pa provided on the upstream side of the platen 9 of the first printing unit 2a is taken as the first detected tension value b1, the tension value detected by the second tension detector Pb provided on the upstream side of the platen 9 of the second printing unit 2b is taken as the second detected tension value b2, the tension value detected by the third tension detector Pc provided on the upstream side of the platen 9 of the third printing unit 2c is taken as the third detected tension value b3, the tension value detected by the fourth tension detector Pd provided on the upstream side of the platen 9 of the fourth printing unit 2d is taken as the fourth detected tension value b4, the tension value detected by the fifth tension detector Pe provided on the upstream side of the platen 9 of the fifth printing unit 2e is taken as the fifth detected tension value b5, and the tension value detected by the sixth tension detector Pf provided on the upstream side of the platen 9 of the sixth printing unit 2f is taken as the sixth detected tension value b5 The tension value b6 is a seventh detected tension value b7, which is a tension value detected by a seventh tension detector Pg provided between the platen 9 of the sixth printing unit 2f and the downstream reverse roller 10 of the sheet discharge unit 3A. Then, the first to seventh detected tension values b1 to b7 are output to the control device 110, respectively.

The monitor 120 is provided at an arbitrary position of the intermittent printer 100.

The monitor 120 is explained in detail based on fig. 11. Fig. 11 is an enlarged explanatory view of the monitor shown in fig. 10.

As shown in fig. 11, the monitor 120 includes a detected tension value display unit 121 that displays the detected tension value bN output from the control device 110.

The detected tension value display unit 121 displays the detected tension value at the time of forward rotation and the detected tension value at the time of reverse rotation output from the control device 110. For example, when the normal rotation time entry timing signal R1 is input to the control device 110, the monitor 120 displays the detected tension value during normal rotation, and when the reverse rotation time entry timing signal R2 is input to the control device 110, the monitor 120 displays the detected tension value during reverse rotation.

Therefore, the operator operating the intermittent printer 100 can grasp the actual tension value when the printing substrate W traveling on the traveling path travels in the forward direction or the reverse direction by visually detecting the tension value display unit 121.

When the actual tension value grasped by the operator is different from the appropriate tension value at which printing can be accurately performed without causing deviation of the printing register, the operator outputs the motor rotation speed control signal S to the control device 110 to control the rotation speed of the drive motor M so that the actual tension value (the tension value displayed on the detected tension value display unit 121) becomes the appropriate tension value, and can make a state in which there is no deviation of the printing register in a short time.

The monitor 120 of the tension level control apparatus according to the present embodiment includes a set tension level display unit 122 for displaying the set tension level cN and a display operation unit 123 for displaying the set tension level cN on the set tension level display unit 122. Further, the monitor 120 may have a function of displaying an alarm when the detected tension value bN detected by the first to seventh tension detectors Pa to Pg is out of the range of the set tension value cN (for example, when the difference between the detected tension value bN and the set tension value cN is ± 0.1kgf or more).

The set tension cN is an appropriate tension at which printing can be performed accurately without causing a deviation in printing registration, and is determined by empirical rules, experiments, and the like according to individual differences (manufacturing errors) of the components of the printing unit, mechanical loss, and various conditions of the substrate to be printed.

The set tension value cN includes a set tension value at the time of forward rotation when the upstream-side retracting roller 6, the downstream-side retracting roller 10, the pressure cylinder 9, and the first to eleventh transfer rollers 81a to 81k rotate forward, and a set tension value at the time of reverse rotation when the upstream-side retracting roller 6, the downstream-side retracting roller 10, the pressure cylinder 9, and the first to eleventh transfer rollers 81a to 81k rotate backward.

When the forward rotation capturing signal R1 is input to the control device 110, the set tension value display unit 122 displays the forward rotation set tension value, and when the reverse rotation capturing signal R2 is input to the control device 110, the set tension value display unit 122 displays the reverse rotation set tension value.

Further, a forward rotation detected tension value display unit may be provided which displays the detected tension value bN at the time of forward rotation of the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k, respectively; and a reverse rotation-time detected tension value display unit that displays a detected tension value bN when the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k are rotating in reverse; and a forward rotation set tension value display unit that displays a forward rotation set tension value and a reverse rotation set tension value display unit that displays a reverse rotation set tension value, wherein when a forward rotation take-in timing signal is input to the control device 110, the forward rotation set tension value display unit and the forward rotation set tension value display unit display, and when a reverse rotation take-in timing signal is input to the control device 110, the reverse rotation set tension value display unit and the reverse rotation set tension value display unit display.

The monitor 120 according to the present embodiment includes first to seventh detected tension value display units 121a to 121g that display first to seventh detected tension values b1 to b7 detected by the first to seventh tension detectors Pa to Pg, respectively, and first to seventh set tension value display units 122a to 122g that display first to seventh set tension values c1 to c7, respectively.

The first to seventh set tension values c1 to c7 are appropriate tension values of the printing substrate W traveling on the traveling path in the portion where the first to seventh tension detectors Pa to Pg are provided, and are displayed by the operation display operation unit 123.

The monitor 120 also has a drive motor rotation speed setting unit 124 for outputting a motor rotation speed control signal S for changing and setting the rotation speed of each drive motor M to the control device 110, and displays print information other than the detected tension bN. That is, the monitor 120 is an interface for performing the operation of the intermittent printer 100. For example, a touch panel type monitor is used. Not limited to this, the monitor 120 may display only the detected tension value bN.

Therefore, by visually detecting the tension value display unit 121 and the set tension value display unit 122, it is possible to easily grasp whether or not the actual tension value of the printing substrate W is an appropriate value when the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k rotate in the forward direction and when the upstream-side reverse roller 6, the downstream-side reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k rotate in the reverse direction.

When the actual tension value of the printing substrate W is not an appropriate value, the actual tension value of the printing substrate W can be made an appropriate value by controlling the rotation speed of the drive motor M by operating the drive motor rotation speed setting unit 124.

Therefore, since the drive motor rotation speed setting unit 124 of the monitor 120 is operated while looking at the monitor 120, the operation of setting the actual tension value of the printing substrate W to an appropriate value is simple and easy.

Next, a first embodiment of an operation of setting the actual tension value of the printing substrate W to an appropriate value will be described.

The first to seventh detected tension values b1 to b7 detected by the first to seventh tension detectors Pa to Pg are output to the control device 110 and displayed on the first to seventh detected tension value display units 121a to 121g, respectively. The first to seventh set tension value displays 122a to 122g display first to seventh set tension values c1 to c7, respectively. The display method is similar to the above description, and the detected tension value at the time of forward rotation, the set tension value at the time of forward rotation, the detected tension value at the time of reverse rotation, and the set tension value at the time of reverse rotation are displayed.

When the detected tension value bN is different from the set tension value cN, the rotation speed of the drive motor M of the transport roller between the tension detector and the printing unit, that is, the transport roller on the upstream side of the tension detector, which outputs the different detected tension value bN, is controlled so that the detected tension value bN is the same as the set tension value cN.

That is, the rotation speed of the drive motor M of the first and second conveying rollers 81a and 81b is controlled with respect to the second detected tension value b2 of the second tension detector Pb. The rotation speed of the drive motor M of the third and fourth conveyance rollers 81c and 81d is controlled with respect to the third detected tension value b3 of the third tension detector Pc.

The rotation speed of the drive motor M of the fifth and sixth conveyance rollers 81e and 81f is controlled with respect to the fourth detected tension value b4 of the fourth tension detector Pd. The rotation speeds of the drive motors M of the seventh and eighth conveyance rollers 81g and 81h are controlled with respect to the fifth detected tension value b5 of the fifth tension detector Pe.

The rotation speed of the drive motor M of the ninth and tenth conveyance rollers 81i and 81j is controlled with respect to a sixth detected tension value b6 of the sixth tension detector Pf. The rotation speed of the drive motor M of the eleventh conveying roller 81k is controlled with respect to the seventh detected tension value b7 of the seventh tension detector Pg.

The control of the rotational speed of the drive motor M is as follows.

When the drive motor M is rotated in the forward direction and the printing substrate W travels in the forward direction, if the detected tension value is lower than the set tension value during the forward rotation, the rotation speed of the drive motor M is decreased and the actual tension value of the printing substrate W is increased.

When the detected tension value during the normal rotation is higher than the set tension value during the normal rotation, the rotation speed of the drive motor M is increased to reduce the actual tension value of the printing substrate W.

When the drive motor M rotates in the reverse direction and the printing substrate W travels in the reverse direction, if the detected tension value is lower than the set tension value during reverse rotation, the rotation speed of the drive motor M is increased to increase the actual tension value of the printing substrate W.

When the detected tension value during reverse rotation is higher than the set tension value during reverse rotation, the rotation speed of the drive motor M is reduced to reduce the actual tension value of the printing substrate W.

For example, when the drive motor M is rotated normally and the printing substrate W travels in the forward direction in the traveling path of the first printing unit 2a, if the second detected tension value b2 at the time of the normal rotation of the second tension detector Pb is lower than the second set tension value c2 at the time of the normal rotation, the rotation speed of the drive motor M of the first and second transport rollers 81a and 81b is reduced, and the actual tension value of the printing substrate W traveling in the traveling path of the first printing unit 2a is increased.

When the second detected tension value b2 during the normal rotation is higher than the second set tension value c2 during the normal rotation, the rotation speed of the drive motor M of the first and second transport rollers 81a and 81b is increased to decrease the actual tension value of the printing substrate W traveling on the traveling path of the first printing unit 2 a.

When the drive motor M rotates in the reverse direction and the printing substrate W travels in the reverse direction in the travel path of the first printing unit 2a, if the second detected tension value b2 at the time of reverse rotation of the second tension detector Pb is lower than the second set tension value c2 at the time of reverse rotation, the rotation speed of the drive motor M of the first and second transport rollers 81a and 81b is increased to increase the actual tension value of the printing substrate W traveling in the travel path of the first printing unit 2 a.

When the second detected tension value b2 in the reverse rotation is higher than the second set tension value c2 in the reverse rotation, the rotation speed of the drive motor M of the first and second transport rollers 81a and 81b is reduced, and the actual tension value of the printing substrate W traveling on the traveling path of the first printing unit 2a is reduced.

According to the first embodiment, during forward rotation and reverse rotation, the tension of the printing substrate W can be increased without being affected by the pressure cylinder 9, the nip roller 42, and the like when controlling the first to eleventh conveyance rollers 81a to 81k, because the cylinder 9 is not pressed between the tension detector and the conveyance rollers controlled based on the detected tension value bN detected by the tension detector, specifically, between the second tension detector Pb and the first and second conveyance rollers 81a and 81b, between the third tension detector Pc and the third and fourth conveyance rollers 81c and 81d, between the fourth tension detector Pd and the fifth and sixth conveyance rollers 81e and 81f, between the fifth tension detector Pe and the seventh and eighth conveyance rollers 81g and 81h, between the sixth tension detector Pf and the ninth and tenth conveyance rollers 81i and 81j, and between the seventh tension detector Pg and the eleventh conveyance roller 81k, And decreases.

Next, a second embodiment of the operation of setting the actual tension value of the printing substrate W to an appropriate value will be described.

The first to seventh detected tension values b1 to b7 detected by the first to seventh tension detectors Pa to Pg are output to the control device 110 and displayed on the first to seventh detected tension value display units 121a to 121g, respectively. The first to seventh set tension value displays 122a to 122g display first to seventh set tension values c1 to c7, respectively. The display method is similar to the above description, and the detected tension value at the time of forward rotation, the set tension value at the time of forward rotation, the detected tension value at the time of reverse rotation, and the set tension value at the time of reverse rotation are displayed.

When the detected tension value bN of the first to seventh tension detectors Pa to Pg is different from the set tension value cN, the detected tension value bN is set to the same value as the set tension value cN by controlling the transport roller on the upstream side in the traveling direction of the printing substrate W with respect to the tension detector that outputs the different detected tension value bN, that is, by controlling the transport roller on the side of the paper feeding section 1B with respect to the tension detector when the printing substrate W travels in the forward direction, and by controlling the rotation speed of the drive motor M of the transport roller on the side of the paper discharge section 3A with respect to the tension detector when the printing substrate W travels in the reverse direction.

That is, when the drive motor M is rotated in the positive direction to move the printing substrate W in the positive direction, the rotation speed of the drive motor M of the first and second conveyance rollers 81a and 81b is controlled with respect to the second detected tension value b2 of the second tension detector Pb, and the rotation speed of the drive motor M of the third and fourth conveyance rollers 81c and 81d is controlled with respect to the third detected tension value b3 of the third tension detector Pc.

The rotation speed of the drive motor M of the fifth and sixth conveying rollers 81e and 81f is controlled with respect to a fourth detected tension value b4 of the fourth tension detector Pd, and the rotation speed of the drive motor M of the seventh and eighth conveying rollers 81g and 81h is controlled with respect to a fifth detected tension value b5 of the fifth tension detector Pe.

The rotation speed of the drive motor M of the ninth and tenth conveying rollers 81i and 81j is controlled with respect to a sixth detected tension value b6 of the sixth tension detector Pf, and the rotation speed of the drive motor M of the eleventh conveying roller 81k is controlled with respect to a seventh detected tension value b7 of the seventh tension detector Pg.

The control of the rotational speed of the drive motor M at this time is similar to the control during the normal rotation in the first embodiment. For example, when the second detected tension value b2 of the second tension detector Pb is lower than the second set tension value c2, the rotation speed of the drive motor M of the first and second transport rollers 81a and 81b is reduced to increase the actual tension value of the printing substrate W.

When the second detected tension value b2 of the second tension detector Pb is higher than the second set tension value c2, the rotation speed of the drive motor M of the first and second conveyance rollers 81a and 81b is increased to lower the actual tension value of the printing substrate W.

When the printing substrate W is moved in the reverse direction by rotating the drive motor M in the reverse direction, the rotation speed of the drive motor M of the first and second conveyance rollers 81a and 81b is controlled with respect to the first detected tension value b1 of the first tension detector Pa, the rotation speed of the drive motor M of the third and fourth conveyance rollers 81c and 81d is controlled with respect to the second detected tension value b2 of the second tension detector Pb, and the rotation speed of the drive motor M of the fifth and sixth conveyance rollers 81e and 81f is controlled with respect to the third detected tension value b3 of the third tension detector Pc.

The rotation speed of the drive motor M of the seventh and eighth transport rollers 81g and 81h is controlled with respect to a fourth detected tension value b4 of the fourth tension detector Pd, and the rotation speed of the drive motor M of the ninth and tenth transport rollers 81i and 81j is controlled with respect to a fifth detected tension value b5 of the fifth tension detector Pe.

The rotation speed of the drive motor M of the eleventh conveying roller 81k is controlled with respect to a sixth detected tension value b6 of the sixth tension detector Pf.

The rotational speed of the drive motor M at this time is controlled as follows.

When the first detected tension value b1 of the first tension detector Pa is lower than the first set tension value c1, the rotation speed of the drive motor M of the first and second conveyance rollers 81a and 81b is reduced to increase the actual tension value of the printing substrate W. When the tension is high, the rotation speed of the first and second transport rollers 81a and 81b is increased to lower the actual tension value of the printing substrate W.

When the second detected tension value b2 of the second tension detector Pb is lower than the second set tension value c2, the rotation speed of the drive motor M of the third and fourth transport rollers 81c and 81d is reduced to increase the actual tension value of the printing substrate W. When the tension is high, the rotation speed of the third and fourth conveyance rollers 81c and 81d is increased to lower the actual tension of the printing substrate W.

When the third detected tension value b3 of the third tension detector Pc is lower than the third set tension value c3, the rotation speed of the drive motor M of the fifth and sixth transport rollers 81e and 81f is reduced to increase the actual tension value of the printing substrate W. When the tension is high, the rotation speed of the fifth and sixth transport rollers 81e and 81f is increased to lower the actual tension value of the printing substrate W.

When the fourth detected tension value b4 of the fourth tension detector Pd is lower than the fourth set tension value c4, the rotation speed of the drive motor M of the seventh and eighth transfer rollers 81g and 81h is reduced to increase the actual tension value of the printing substrate W. When the tension is high, the rotation speed of the seventh and eighth transport rollers 81g and 81h is increased to lower the actual tension value of the printing substrate W.

When the fifth detected tension value b5 of the fifth tension detector Pe is lower than the fifth set tension value c5, the rotation speed of the drive motor M of the ninth and tenth transport rollers 81i and 81j is reduced to increase the actual tension value of the printing substrate W. When the tension is high, the rotation speed of the ninth and tenth transport rollers 81i and 81j is increased to lower the actual tension value of the printing substrate W.

When the sixth detected tension value b6 of the sixth tension detector Pf is lower than the sixth set tension value c6, the rotation speed of the drive motor M of the eleventh transfer roller 81k is reduced to increase the actual tension value of the printing substrate W. When the tension is high, the rotation speed of the eleventh transfer roller 81k is increased to lower the actual tension value of the printing substrate W.

According to the second embodiment, the drive motor M of the transport roller on the upstream side in the traveling direction of the printing substrate W is controlled for each of the first to seventh tension detectors Pa to Pg at the time of normal rotation and at the time of reverse rotation, whereby the printing substrate W can be transported to the platen 9 with a set tension, and the printing accuracy on each side of the image can be accurately reproduced.

Next, a third embodiment of the operation of setting the actual tension value of the printing substrate W to an appropriate value will be described.

The actual tension value of the printing substrate W is set to an appropriate value by controlling the rotation speed of the drive motor M of each of the first to eleventh conveyance rollers 81a to 81k with reference to the detected tension value bN of any 1 of the first to seventh tension detectors Pa to Pg.

For example, the fourth detected tension value b4 detected by the fourth tension detector Pd is output to the control device 110. When the forward rotation capturing signal R1 is input to the control device 110, the fourth detected tension value b4 (detected tension value during forward rotation) is displayed on the fourth detected tension value display unit 121d, and the fourth set tension value c4 (set tension value during forward rotation) is displayed on the fourth set tension value display unit 122 d.

Then, the operator operates the drive motor rotation speed setting unit 124 to output the motor rotation speed control signal S to the control device 110, and the control device 110 controls the rotation speed of the drive motor M of the first to eleventh transport rollers 81a to 81k so that the fourth detected tension value b4 (detected tension value during normal rotation) becomes the fourth set tension value c4 (set tension value during normal rotation) and the actual tension value of the printing substrate W during normal rotation becomes an appropriate value.

When the reverse rotation time acquisition signal R2 is input to the control device 110, the fourth detected tension value display unit 121d displays the fourth detected tension value b4 (detected tension value during reverse rotation), and the fourth set tension value display unit 122d displays the fourth set tension value c4 (set tension value during reverse rotation).

Then, the operator operates the drive motor rotation speed setting unit 124 to output the motor rotation speed control signal S to the control device 110, and the control device 110 controls the rotation speed of the drive motor M of the first to eleventh transport rollers 81a to 81k so that the fourth detected tension value b4 (detected tension value at the time of reverse rotation) becomes the fourth set tension value c4 (set tension value at the time of reverse rotation) and the actual tension value of the printing substrate W at the time of reverse rotation becomes an appropriate value.

The operation of this embodiment is adapted to the case where there is no large difference in the actual tension values in a plurality of portions of the printing substrate W, and the tension detector, the detected tension value display unit, and the set tension value display unit may be 1 each.

When the printing substrate W travels in the forward direction, the rotation speeds of the first to eleventh transfer rollers 81a to 81k are sequentially increased from the first transfer roller 81a to the eleventh transfer roller 11k so that the rotation speed of the first transfer roller 81a is the slowest and the rotation speed of the eleventh transfer roller 81k is the fastest. When the printing substrate W travels in the reverse direction, the rotation speed of the first conveyance roller 81a is gradually reduced from the first conveyance roller 81a to the eleventh conveyance roller 81k so that the rotation speed of the first conveyance roller 81a becomes the fastest and the rotation speed of the eleventh conveyance roller 81k becomes the slowest.

That is, the rotation speed of the transport roller located on the downstream side in the traveling direction is set to be higher than the rotation speed of the transport roller located on the upstream side in the traveling direction of the printing substrate W.

The rotation speeds of the first transfer roller 81a and the second transfer roller 81b may be the same, the rotation speeds of the third transfer roller 81c and the fourth transfer roller 81d may be the same, the rotation speeds of the fifth transfer roller 81e and the sixth transfer roller 81f may be the same, the rotation speeds of the seventh transfer roller 81g and the eighth transfer roller 81h may be the same, and the rotation speeds of the ninth transfer roller 81i and the tenth transfer roller 81j may be the same.

The detected tension value bN detected by each of the tension detectors Pa to Pg is output to the control device 110, and is captured and displayed on the monitor 120 at a timing that matches the capture-time machine signal R.

The machine-in-taking signal R includes a forward rotation-time taking-in signal R1 and a reverse rotation-time taking-in signal R2, which are generated based on the driving of the intermittent printer 100.

In the present embodiment, the take-in timing signal R is sent when the rotation angle of the rubber lining cylinder 8 reaches a predetermined angle.

The reference to be given to the take-in timing signal R for displaying the detected tension value bN detected by each of the tension detectors Pa to Pg on the monitor 120 is not limited to the rubber-lined fabric tube 8, and can be arbitrarily set from any 1 of the platen 9, the upstream-side reverse roller 6, the downstream-side reverse roller 10, and the first to eleventh transport rollers 81a to 81 k.

Next, the entry-time device signal R in the present embodiment will be described with reference to fig. 12. Fig. 12 is a graph showing the timing of taking in the detected tension value as the rotation speed ratio of the pressing drum with respect to the rotation angle of the rubber-lined cloth drum. The rotation speed ratio of the platen means a ratio of the rotation speed of the platen 9 in printing to the rotation speed of the platen 9.

The take-in time signal R for displaying the detected tension values bN of the tension detectors Pa to Pg on the monitor 120 is generated 6 times during one rotation of the blanket cylinder 8 in accordance with the rotation angle of the blanket cylinder 8 at the first point a, the second point B, the third point C, the fourth point D, the fifth point E, and the sixth point F shown in fig. 12. However, the rotation angle is selected and set within an angle range in which the rotation angles of the first to sixth points a to F are added or subtracted several times, and the entry-time machine signal is transmitted in accordance with the set rotation angle.

The first to sixth points a to F are as follows.

The first point a is a printing start point (see fig. 5 (a)).

Here, the printing start point is a section from the contact between the leading end 8a-1 of the blanket 8a and the printing substrate W tangent to the circumferential surface of the platen 9 to the start of printing on the printing substrate W. As shown in fig. 12, the rotation angle α of the rubber-lined cloth cylinder 8 at the start of printing on the printing target substrate W is (α 4+ α 5) degrees.

The second dot B is an intermediate dot in printing (see fig. 5 (B)).

Here, the middle point in printing is a section where the rubber blanket 8a is in contact with the printing substrate W and performs printing on the printing substrate W. As shown in fig. 12, the rotation angle α of the blanket cylinder 8 at a time when the blanket 8a passes through a half of the section where the blanket contacts the printing substrate W is (360 degrees — α 1/2) degrees.

The third point C is a print end point (see fig. 5C).

Here, the printing end point is a section from the end of printing on the printing target substrate W to the point where the rear end 8a-2 of the blanket 8a is not in contact with the printing target substrate W in contact with the circumferential surface of the platen 9. As shown in fig. 12, the rotation angle α of the blanket cylinder 8 at the end of printing on the printing substrate W is 0 degree.

The fourth point D is a reverse rotation start point at which the normal rotation is switched to the reverse rotation (see fig. 5D).

Here, the reverse rotation start point is a section from the start of deceleration of the pressure cylinder 9 that is rotating in the forward direction to the end of acceleration in the reverse rotation direction after the pressure cylinder 9 is stopped, and reaches a predetermined reverse rotation speed. As shown in fig. 12, the rotation angle α of the rubber blanket cylinder 8 at the time when the pressure cylinder 9 rotating positively while decelerating is stopped is α 2 degrees.

The fifth point E is an intermediate point in the reverse rotation (see fig. 6 (b)).

Here, the middle point in the reverse rotation is a section in which the pressure cylinder 9 rotates in the reverse rotation direction. As shown in fig. 12, the rotation angle α of the rubber blanket cylinder 8 at the time when the half of the angle by which the platen cylinder 9 is rotated by the reverse rotation is α 3 degrees.

The sixth point F is a forward rotation starting point at which the reverse rotation is switched to the forward rotation (see fig. 6 c).

Here, the positive rotation start point is a section from the start of deceleration of the platen 9 that performs the reverse rotation to the end of acceleration in the positive rotation direction after the platen 9 stops and reaches the printing speed. As shown in fig. 12, the rotation angle α of the rubber blanket cylinder 8 at the time when the pressure cylinder 9 rotating positively while decelerating is stopped is α 4 degrees.

The rotation angle α of the blanket cylinder 8 at the first to sixth points a to F is an angle obtained when the rotation angle of the blanket cylinder 8 at the end of printing shown in fig. 5(c) is determined to be 0 degrees.

When the print size (print length in the vertical direction) of the printing target substrate W is changed, the rotation angles α 1, α 2, α 3, α 4, and α 5 of the rubber-lined fabric tube 8 are changed, and therefore the rotation angle α of the rubber-lined fabric tube 8 at the first, second, fourth, fifth, and sixth points A, B, E, F is also changed in accordance with the change in the print size.

The entry-time machine signal R is sent as follows.

The rotation angle α of the rubber lining cloth cylinder 8 is detected, and during one rotation of the rubber lining cloth cylinder 8, a normal rotation time access timing signal R1 is transmitted when the rotation angle α is (α 4+ α 5) degrees, (360- α 1/2) degrees, 0 degrees, and α 4 degrees, and a reverse rotation time access timing signal R2 is transmitted when the rotation angle α is α 2 degrees, and α 3 degrees.

Here, α 4 degrees as the forward rotation start point is captured as the forward rotation, and α 2 degrees as the reverse rotation start point is captured as the reverse rotation, but as described above, the forward rotation start point is a section from the start of deceleration of the pressure cylinder 9 performing the reverse rotation to the end of the stop of the pressure cylinder 9 and the acceleration in the forward rotation direction to the printing speed, and the reverse rotation start point is a section from the start of deceleration of the pressure cylinder 9 performing the forward rotation to the end of the stop of the pressure cylinder 9 and the acceleration in the reverse rotation direction to the predetermined reverse rotation speed, and therefore α 4 degrees and α 2 degrees may be captured as the reverse rotation and the forward rotation.

The entry-time machine signal R generated when the rotation angle α is (α 4+ α 5) degrees, (360- α 1/2) degrees, 0 degrees, α 4 degrees, α 2 degrees, and α 3 degrees is output to the control device 110, the control device 110 outputs the detected tension value bN to the monitor 120, the detected tension value bN of the first to sixth points a to F detected immediately before is displayed on the detected tension value display unit 121 of the monitor 120, and the detected tension value bN is updated to the latest value every time the rubber lining tube 8 rotates one revolution.

The display of the detected tension value bN on the detected tension value display unit 121 of the monitor 120 is not limited to this, and can be performed as follows.

That is, the control device 110 calculates an average value of the tension values bN detected at the first to sixth points a to F for the past several times, and displays the average value as the detected tension value bN on the detected tension value display unit 121 of the monitor 120. By displaying the average value, the detected tension values bN at the first to sixth points a to F can be more accurately obtained, and the actual tension value of the printing substrate W can be more accurately set to an appropriate value.

The timing of taking in the detected tension bN is not limited to the first to sixth points a to F as long as the detected tension bN at the time of the forward rotation of the platen 9 and the detected tension bN at the time of the reverse rotation of the platen 9 can be obtained. That is, during 1 rotation of the blanket cylinder 8, at least 2 times or more of the forward rotation operation and the reverse rotation operation of the upstream reverse roller 6, the downstream reverse roller 10, the platen 9, and the first to eleventh transport rollers 81a to 81k may be taken in, and each detected tension value bN may be displayed on the detected tension value display unit 121 of the monitor 120.

Therefore, it is not necessary to take in the detected tension bN at all timings of the first to sixth points a to F, and the detected tension bN at timings other than the timings of the first to sixth points a to F may be taken in and displayed on the detected tension display unit 121 of the monitor 120.

For example, the second point B may be captured at a point other than the middle point (points B-1 and B-2 in FIG. 12), or the tension value may be captured at a plurality of points during printing and the average value may be displayed on the detected tension value display unit 121 of the monitor 120.

Next, an example of a method of controlling the tension value of the printing target substrate W in the intermittent printer 100 according to the present embodiment will be described.

The operator of the intermittent printer 100 manually operates the display operation unit 123 of the monitor 120 to display the set tension value cN on the set tension value display unit 122.

The actual tension value of the printing substrate W is detected by the tension detectors Pa to Pg, and the detected tension value bN is continuously output to the control device 110. The entry-time signal R generated based on the first to sixth points a to F is output to the control device 110, and the detected tension bN is output to the monitor 120 at a predetermined timing and displayed on the detected tension display unit 121.

The operator of the intermittent printer 100 compares the detected tension bN displayed on the detected tension display unit 121 of the monitor 120 with the set tension cN, which is a preset appropriate tension, displayed on the set tension display unit 122. Here, the set tension cN manually set by the operator means the tension to be detected by the nth tension detector from the supply side, and printing without deviation of printing registration can be performed while maintaining the state in which the detected tension bN detected by the nth tension detector is the same as the set tension cN.

When there is a difference between the detected tension value bN displayed on the detected tension value display unit 121 of the monitor 120 and the set tension value cN displayed on the set tension value display unit 122, the operator operates the drive motor rotation speed setting unit 124 to output the motor rotation speed control signal S to the control device 110, and controls the rotation speed of the drive motor M so that the detected tension value bN displayed on the detected tension value display unit 121 of the monitor 120 becomes the set tension value cN displayed on the set tension value display unit 122.

For example, the operator of the intermittent printer 100 operates the drive motor rotation speed setting unit 124 of the monitor 120 to correct the rotation speed during forward rotation and the rotation speed during reverse rotation of the drive motor M for rotating the first to eleventh conveyance rollers 81a to 81k, respectively, to adjust the actual tension value during forward rotation and the actual tension value during reverse rotation of the printing substrate W, and controls the rotation speed of the drive motor M so that the detected tension value bN detected by the nth tension detector displayed on the detected tension value display unit 121 of the monitor 120 becomes the set tension value cN displayed on the set tension value display unit 122.

The control device 110 continuously outputs a signal for controlling the rotation speed of the drive motor M for rotating the first to eleventh conveyance rollers 81a to 81k by the operator of the intermittent printer 100 by continuously manually operating the drive motor rotation speed setting unit 124, and thus continuously operates the drive motor rotation speed setting unit 124 until the detected tension value bN detected by the nth tension detector displayed on the detected tension value display unit 121 of the monitor 120 becomes the set tension value cN displayed on the set tension value display unit 122.

This method is based on the first embodiment of the operation described above for setting the actual tension value of the printing substrate W to an appropriate value.

In the above description, the rotational speed of the drive motor M of the first to eleventh transport rollers 81a to 81k is controlled, but the rotational speed of the drive motors of the upstream-side reverse roller 6, the downstream-side reverse roller 10, and the platen 9 of each of the printing units 2a to 2f may be controlled.

By controlling the tension value according to the present embodiment, the printing accuracy per 1 surface of the image can be accurately reproduced.

Further, since the detected tension values b1 to b7 at predetermined timings on the upstream side of the respective printing units 2a to 2f and on the downstream side of the sixth printing unit 2f as the final printing unit can be monitored by the monitor 120, the detected tension values b1 to b7 can be set to the set tension values c1 to c7 having appropriate values in a short time.

The control device 110 can be configured as follows.

The rotation speed of the drive motor M of the first to eleventh transport rollers 81a to 81k is corrected based on the detected tension value bN detected by the tension detectors Pa to Pg and the set tension value cN, and the rotation speed of the drive motor M of the first to eleventh transport rollers 81a to 81k is controlled based on the calculated correction amount, thereby making the detected tension value bN equal to the set tension value cN.

For example, the control device 110 includes a first unit that compares a detected tension value bN detected by the tension detectors Pa to Pg with a set tension value cN to obtain a difference therebetween, a second unit that calculates a drive motor rotation speed correction amount corresponding to the difference obtained by the first unit, and a third unit that controls the rotation speed of the drive motor M of the first to eleventh transport rollers 81a to 81k according to the drive motor rotation speed correction amount calculated by the second unit.

According to the control device 110 having this configuration, the actual tension value of the printing substrate W can be automatically set to the set tension value cN, and therefore, even when the tension value of the printing substrate W varies during traveling, the control amount of the rotation speed of the drive motor M can be automatically corrected.

The detected tension bN may be an average value of a plurality of detected tension bN detected within a predetermined time period, and the correction amount of the rotation speed of the drive motor may be calculated over time.

The printing target substrate W used in the intermittent printer 100 of the present embodiment may be a flexible packaging substrate (plastic film) such as OPP, PET, CPP, or nylon, in addition to paper. Thus, a flexible package printed matter can be manufactured.

Generally, the stretching ratio when tension is applied to the printing substrate W is inversely proportional to the young's modulus of the printing substrate W and directly proportional to the tension of the printing substrate W. Since the film is soft and has a small young's modulus compared to paper, the stretch ratio of the printing substrate W due to tension fluctuation is large. Therefore, there is a case where a deviation of printing registration occurs significantly.

In general, the expansion/contraction ratio when tension is applied to the printing substrate W is inversely proportional to the cross-sectional area of the printing substrate W (the product of the thickness and the width of the printing substrate W). Therefore, the thinner the thickness of the flexible packaging substrate W is, the smaller the cross-sectional area is, and the larger the stretch ratio of the printing substrate W due to tension fluctuation is.

Therefore, since the control of the tension value is particularly important in a thin film, the effect of displaying the actual tension value of the printing substrate W by the method of the present embodiment and controlling the actual tension value of the printing substrate W is large.

In the intermittent printer 100 according to the present embodiment, the control amount of the drive motor M can be set to an appropriate tension value according to the type and thickness of the film with reference to the detected tension value bN displayed on the detected tension value display unit 121 of the monitor 120.

Therefore, even if the substrate W to be printed is a thin film of 5 to 200 μm, the deviation of printing registration can be prevented. In particular, the thickness of the printing substrate W is preferably 10 to 30 μm.

The tension applied to the printing substrate W varies depending on the printing speed. Generally, when the printing speed is high, the deviation between the drive motor rotation speed command value from the control device 110 and the rotation speeds of the conveyance rollers 81a to 81k becomes large. This increases the variation in tension.

By producing a printed matter using the intermittent printer 100 according to the present embodiment, the actual tension value of the printing substrate W can be checked by the monitor 120, and the actual tension value can be controlled by adjusting the rotation speed of the drive motor M.

Therefore, the printed matter with the deviation of the printing register prevented can be manufactured at the printing speed of 10-300 sheets per 1 minute, and the printing register precision equivalent to the printing speed of 10-250 sheets can be obtained at the printing speed of 250-300 sheets.

In order to set the tension to an appropriate value according to the speed, a feedback system may be provided for monitoring the traveling speed of the printing substrate W or the rotational speeds of the upstream-side reverse roller 6, the downstream-side reverse roller 10, and the press cylinders 9 and the first to eleventh transport rollers 81a to 81k of the printing units 2a to 2f, and for reaching an appropriate tension value according to the speed at the earliest.

Claims (13)

1. A batch printing machine is provided with an upstream side reverse roller; a downstream-side reverse roller; a plurality of printing units arranged between the upstream-side reverse roller and the downstream-side reverse roller in a traveling direction of the printing target substrate; and a plurality of transport rollers provided on the downstream side of each of the printing units,

the intermittent printer performs printing by repeating a process of causing the upstream-side reverse roller, the downstream-side reverse roller, and the platen and the transport roller of the printing unit to rotate in the forward direction to print an image while causing the printed substrate to travel in the forward direction, and after the printing, causing the printed substrate to travel only in the reverse direction by causing the upstream-side reverse roller, the downstream-side reverse roller, the platen and the transport roller to rotate in the reverse direction by a length amount of the printed substrate determined so as not to perform printing of an image on the printed substrate, and after the printing, causing the upstream-side reverse roller, the downstream-side reverse roller, the platen and the transport roller to rotate in the forward direction again to cause the printed substrate to travel in the forward direction to perform printing, the intermittent printer including a tension detector and a monitor,

a tension detector disposed upstream of the printing units and downstream of the final printing unit for detecting tension of the printing substrate,

a monitor for displaying the detected tension values of the upstream-side reverse roller, the downstream-side reverse roller, the platen and the transport roller detected by the tension detector during normal rotation, respectively; and detected tension values of the upstream-side reverse roller, the downstream-side reverse roller, the platen, and the transport roller during reverse rotation.

2. The intermittent printing press of claim 1,

the monitor displays the detected tension value detected by the tension detector at a timing specified based on at least one of a printing start point, a middle point during printing, a printing end point, a switching point from normal rotation to reverse rotation, a middle point during reverse rotation, and a switching point from reverse rotation to normal rotation during one rotation of the blanket cylinder of the printing unit with reference to at least any one of 1 rotation of the upstream reverse roller, the downstream reverse roller, the press cylinder, and the transport rollers.

3. The intermittent printing press of claim 2,

the detected tension value displayed on the monitor is an average value of the measured tension values of a plurality of times in the past at the predetermined timing.

4. A batch printing press according to any one of claims 1 to 3,

the printing apparatus is provided with a control device which calculates a correction amount of a rotation speed of a drive motor of the transport roller based on a detected tension value detected by the tension detector and a set tension value which is an appropriate value not causing printing register deviation, and controls the rotation speed of the drive motor for rotating the transport roller based on the calculated correction amount so that the detected tension value becomes the set tension value.

5. A batch printing press according to any one of claims 1 to 3,

the substrate to be printed is a plastic film.

6. The intermittent printing press of claim 5,

the substrate to be printed is selected from 1 of polyester, polypropylene, polyethylene and nylon.

7. The intermittent printing press of claim 5,

the thickness of the printed substrate is 5 to 200 μm.

8. A batch printing press according to any one of claims 1 to 3,

drying devices for drying the ink printed on the substrate to be printed are disposed in the respective printing units.

9. The intermittent printing press of claim 8,

the drying device is a system for drying the ink by irradiating the ink with an active energy ray.

10. A method for producing a printed matter, characterized by using the intermittent printer according to any one of claims 1 to 3.

11. The method for manufacturing a printed matter according to claim 10,

the number of the products per minute is 10 to 300.

12. The method for manufacturing a printed matter according to claim 11,

which uses a batch printer for the production of a flexible package printed matter used in the method for producing a printed matter.

13. A method for manufacturing a printed matter, characterized in that,

printing is performed by adjusting the measured value of the tension of the object traveling upstream of each printing unit of the intermittent printing press and downstream of the final printing unit so that the measured value becomes a set value.

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