JP3552626B2 - Conveying sheet support device and printing device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a conveying sheet supporting apparatus that sucks and holds a conveyed sheet and a printing apparatus including the conveying sheet supporting apparatus.
[0002]
[Prior art]
2. Description of the Related Art As a conventional printing apparatus, there is an apparatus in which a sheet (for example, a PVC sheet or paper) is conveyed by a conveying device and printing or printing is performed on the surface of the sheet by a reciprocating print head.
[0003]
In this apparatus, a platen for holding the sheet when printing or printing is provided on the back side of the sheet to be conveyed so as to face the print head. As shown in FIGS. 7 (a) and 7 (b), the platen includes a support plate 1 having a width slightly larger than the width of the sheet-like body. Is attached. A large number of small holes 1 a are provided in the support plate 1 so as to communicate with the space in the box 2. A suction blower (not shown) is attached to the back of the box 2 so as to communicate with the inside of the box. The air inside the box is sucked from a small hole 1a provided in the support plate 1 so that the support plate is sucked. The sheet-like material A conveyed on the upper side 1 is sucked so as to be substantially in close contact with the support plate. In this state, printing is performed on the sheet by the print head.
[0004]
[Problems to be solved by the invention]
In the conventional printing apparatus, depending on the material, thickness and dimensions of the sheet to be conveyed and printed, the vicinity of the edge of the sheet A in the width direction is attracted to the platen as shown in FIG. It may be in a floating state without being. In such a case, inconvenience occurs in printing and printing.
[0005]
In the vicinity of the central portion in the width direction of the sheet A, the tendency to adhere to the support plate 1 by its own weight increases. Further, as shown in FIG. 3B, when the space C floats at the center, the space C is a closed space that is not open to the atmosphere. Is sucked from the small hole 1a and the floating is immediately eliminated as shown in FIG.
[0006]
On the other hand, in the vicinity of the edge in the width direction, as shown in FIG. 7 (b), the sheet-like body A which has once floated has a large distance h from the small hole 1a, and the action of the suction force is large. Since the space is small and the floating space is open to the atmosphere, it is not immediately sucked and the floating state is not eliminated.
[0007]
In order to eliminate the floating around the widthwise edge of the sheet-like body A, it is necessary to reduce the distance between the once raised widthwise edge and the small hole 1a. If this distance is small, the suction force from the small hole 1a closest to the sheet-like body A effectively acts on the sheet-like body A, and the floating can be quickly eliminated. Specifically, for example, as shown in FIG. 9A, it is conceivable to reduce the interval between the small holes 1a to be formed in the support plate 1.
[0008]
In this case, the distance h between the small hole 1a on the inner side in the width direction and the sheet A is reduced as shown in FIG. 2B, so that the suction force acts on the sheet A immediately. As shown in (c), at the same time that the portion comes into close contact with the support plate 1, the distance h from the small hole 1 a on the outer side in the width direction becomes small, and the suction force effectively acts on the sheet-like body A, and FIG. As shown in (2), the sheet-like body A comes into close contact with the support plate 1.
[0009]
In this manner, by uniformly narrowing the interval between the small holes 1a provided in the support plate 1 in the width direction of the support plate 1 and in the transport direction, it is possible to eliminate the floating around the edge of the sheet A in the width direction. However, when such a method is used, there is a problem that the number of small holes 1a formed in the support plate 1 is increased, the man-hour for drilling is extra, and the cost is increased. Further, by opening a large number of small holes 1a in close proximity, the flatness of the support plate 1 is deteriorated, and the holding function of the support plate 1 for holding the sheet A flat may be reduced.
[0010]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to quickly eliminate the lifting of a conveyed sheet in the vicinity of a width direction edge, and not to increase the cost or reduce the function. An object of the present invention is to provide a supporting device and a printing device using the same.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a supporting apparatus for supporting a sheet-like body provided with a large number of small holes in a support plate for supporting a back surface of a sheet-like body to be conveyed, and the sheet-like body is supported by suction from the small holes. A transporting sheet-like body supporting device for bringing the sheet-like body into close contact with a plate, wherein a width of the sheet-like body between small holes formed in a portion of the support plate corresponding to a width direction edge of the sheet-like body. The gap in the direction is not more than 50% of the gap in the width direction of the small hole located inside from the portion corresponding to the edge.
[0012]
As described above, according to the conveying sheet supporting device according to the first aspect of the present invention, the interval between the small holes in the portion corresponding to the vicinity of the edge in the width direction, which is easy to float from the support plate, is reduced. The distance between the vicinity of the edge of the sheet in the width direction and the small hole is reduced, and the suction force from the small hole effectively acts on the vicinity of the edge of the sheet in the width direction, thereby eliminating floating. The portion where the gap between the small holes is narrowed is only the portion corresponding to the vicinity of the edge in the width direction, and the small hole interval provided inside from the portion corresponding to the edge is wider than the vicinity of the edge. Therefore, it is not necessary to form a large number of small holes unnecessarily, the number of drilling steps is not increased unnecessarily, the flatness of the support plate is not impaired, and the deterioration of the holding function is minimized.
In addition, there is no need to unnecessarily form a large number of small holes, the number of drilling steps is not increased unnecessarily, the flatness of the support plate is not impaired, and the deterioration of the holding function is minimized.
[0013 ]
[0014 ]
[0015]
According to a second aspect of the present invention, there is provided a transporting sheet-like body supporting device , wherein a plurality of small holes are provided in a support plate for supporting a back surface of a sheet to be transported, and the sheet-like body is sucked from the small holes to support the sheet-like body. A transporting sheet-like body supporting device for bringing the sheet-like body into close contact with a plate , wherein the transporting of the sheet-like body between small holes formed in a portion of the support plate corresponding to a widthwise edge of the sheet-like body. The interval in the direction is not more than 50% of the interval in the transport direction of the sheet-like body of the small holes located inside from the portion corresponding to the edge.
[0016]
According to the conveying sheet supporting device according to the second aspect of the present invention, the interval between the small holes corresponding to the vicinity of the edge in the width direction that is easy to float from the support plate is reduced, so that the width of the floating sheet material is reduced. The distance between the vicinity of the directional edge and the small hole is reduced, and the suction force from the small hole effectively acts on the vicinity of the width direction edge of the sheet-like body, and floating is eliminated. The portion where the gap between the small holes is narrowed is only the portion corresponding to the vicinity of the edge in the width direction, and the small hole interval provided inside from the portion corresponding to the edge is wider than the vicinity of the edge. Therefore, it is not necessary to form a large number of small holes unnecessarily, the number of drilling steps is not increased unnecessarily, the flatness of the support plate is not impaired, and the deterioration of the holding function is minimized. Moreover, the number of drilling steps does not increase unnecessarily, and the flatness of the support plate is not impaired.
[0017]
According to a third aspect of the present invention, there is provided the transporting sheet-like body supporting device , wherein a plurality of small holes are provided in a support plate for supporting the back surface of the sheet to be transported, and the sheet-like body is supported by suction from the small holes. a conveying sheet-like body support devices to substantially close contact to the plate, between the small holes formed in the vicinity of the portion corresponding to the width direction edges of the sheet product in said support plate, the width of the sheet product the spacing in the direction, which is smaller than the distance in the width direction of the small hole located inwardly from a portion corresponding to the edge of the interval narrowing portions between the small holes, the in the support plate sheet The ratio of the shape to the dimension in the width direction is 30% or less .
[0018]
According to the conveying sheet supporting device according to the third aspect of the present invention, since the small hole interval in the portion corresponding to the vicinity of the width direction edge portion which is easy to float from the support plate is reduced, the width of the floating sheet material is reduced. The distance between the vicinity of the directional edge and the small hole is reduced, and the suction force from the small hole effectively acts on the vicinity of the width direction edge of the sheet-like body, and floating is eliminated. The portion where the gap between the small holes is narrowed is only the portion corresponding to the vicinity of the edge in the width direction, and the small hole interval provided inside from the portion corresponding to the edge is wider than the vicinity of the edge. Therefore, it is not necessary to form a large number of small holes unnecessarily, the number of drilling steps is not increased unnecessarily, the flatness of the support plate is not impaired, and the deterioration of the holding function is minimized. Moreover, the number of drilling steps does not increase unnecessarily, and the flatness of the support plate is not impaired.
[0019]
Conveying the sheet-shaped body supporting apparatus according to claim 4 of the present invention, in conveying sheet-like body supporting device according to claim 1 or claim 3, of the sheet product between pores of narrow portions of the gap The widthwise interval is 5 mm or less, and the widthwise interval of the small holes located inside the narrowed portion is 10 to 20 mm .
[0020]
According to the conveying sheet-like body supporting device according to the fourth aspect of the present invention, in addition to the effects of the first or third aspect of the present invention, floating is eliminated, and the number of drilling steps is increased more than necessary. And the flatness of the support plate is not impaired.
[0021]
In a printing apparatus according to a fifth aspect of the present invention, a print head is disposed to face a surface of the support plate, which constitutes the transporting sheet-like body supporting device of the present invention, on which the sheet-like body is in close contact.
[0022]
According to the printing device of the fifth aspect of the present invention, the lifting near the edge in the width direction of the sheet is eliminated, and the print quality of the print head is prevented from lowering. In addition, there is little increase in cost such as parts cost.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, with reference to the drawings, a description will be given of a transporting sheet support apparatus according to an embodiment of the present invention and a printing apparatus including the transporting sheet support apparatus.
[0024]
FIG. 2 shows a schematic configuration of a printing apparatus according to an embodiment of the present invention. As shown in FIG. 2, a sheet A (for example, a PVC sheet or paper) is wound in a roller shape around a feeding roller 18, and the sheet A pulled out from the feeding roller 18 is tensioned. It is wound around the transport device 11 via the rod 20, passes through the upper surface of the platen 13, and is wound around the winding roller 21 via the tension rod 22.
[0025]
The tension rods 20, 22 are rotatably attached to end portions of link bars 23, 24, which rotate about support shafts 26, 27, on opposite sides of the support shafts, and the link bars 23, 24 are attached thereto. The springs 19 and 25 bias the rotation in one direction. Thereby, the tension rods 20 and 22 are swung about the support shafts 26 and 27, and tension is applied to the sheet-shaped body A conveyed via the tension rods 20 and 22. Further, sensors 28 and 29, which are configured by, for example, proximity switches, are provided so as to sandwich the link bars 23 and 24, respectively. These sensors 28 and 29 detect whether or not the link bars 23 and 24 are at predetermined positions .
[0026]
The transport device 11 includes a transport roller 30 that is driven to rotate by a motor 35, and a pressing roller 34 that is urged to swing toward the transport roller 30 and sandwiches the sheet A with the transport roller 30. The sheet-like material A is sent to the downstream side in the conveyance direction by the conveyance roller 30 that is driven to rotate by the motor 35. The pressing roller 34 is rotatably attached to a tip of a pair of link bars 31 arranged on both sides, and the link bar 31 is swingably provided around a support shaft 32, and the other end of the link bar 31. Is mounted with a spring 33 for biasing the swing.
[0027]
A printing device that performs printing and printing processing on the surface of the sheet A is provided downstream of the conveyance roller 30 in the conveyance direction. The printing apparatus includes a printing unit 39 on the surface of the sheet A and a platen 13 for holding the sheet A when printing or printing. The platen 13 constitutes the conveying sheet supporting device of the present invention.
[0028]
The printing means 39 includes a guide bar 40 extending in the width direction of the sheet-shaped material A conveyed by the print head holder 44, a print head holder 44 movably provided along the guide bar 40, and a driven roller 42. An endless belt 41 rotatably supported at both ends by a drive roller 45 and a print head 12 attached to the print head holder 44. Then, the print head holder 44 is reciprocated in the width direction of the conveyed sheet A by the driving of the motor 43, and the print processing is performed by the print head 12 attached to one end of the print head holder 44.
[0029]
As shown in FIG. 1, the platen 13 includes a support plate 14 having a width slightly larger than the width of the sheet A, and a shape corresponding to the size of the support plate 14 is provided on the back side of the support plate 14. The bottom plate 16 is attached to the opposite side of the support plate 14 so as to form a substantially closed space between the support plate 14 and the frame 15. A through hole 16a is formed in the bottom plate 16, and a suction blower 17 is attached to the through hole 16a.
[0030]
As shown in FIGS. 1 and 3, the support plate 14 is provided with a large number of small holes 14 a and 14 b communicating with a space formed by the bottom plate 16 and the frame 15. By sucking the air in the internal space from the small holes 14a and 14b provided in the support plate 14, the sheet-shaped material A conveyed on the support plate 14 is sucked so that the sheet A is almost in close contact with the support plate 14. In this state, printing is performed on the sheet by the print head 12.
[0031]
Here, the small hole 14a is a small hole provided corresponding to the vicinity of the width direction edge of the sheet-like body to be conveyed, and the small hole 14b is provided corresponding to the inside of the vicinity of the width direction edge. It is a small hole. These small holes 14a and 14b have the same diameter. Here, the interval between the small holes 14a is smaller than the interval between the small holes 14b in the width direction and the transport direction.
[0032]
The specific dimensional relationship of the small holes 14a and 14b formed in the support plate 14 will be described with reference to FIG. The support plate 14 is slightly larger than the width D of the sheet A in the width direction, and has a thickness of 0.8 mm. In this case, the width dimension D of the sheet A is 54 inches (1340 mm). The diameter of the small holes 14b is 1.5 mm, and the interval E in the width direction and the interval F in the transport direction of these small holes 14b are 10 to 20 mm. The diameter of the small hole 14a is 1.5 mm similarly to the small hole 14b. The gap G in the width direction and the gap H in the transport direction of the small holes 14a are set to 5 mm or less. The dimension J in the width direction of the portion where the small hole 14a is provided with a reduced interval is 150 mm.
[0033]
Not limited to this example, the width direction gap G or the conveyance direction space H between the narrow holes 14a is 50 times the width direction space F or the conveyance direction space E of the small holes 14b located inside this portion. % Or less. The dimension J of the portion where the interval between the small holes 14a is narrowed may be 30% or less of the dimension D in the width direction of the sheet A.
[0034]
Next, the operation of the platen 13 which is the transporting sheet supporting device according to the present embodiment and the printing apparatus using the platen 13 will be described.
[0035]
As shown in FIG. 4, when the transport roller 30 is driven to rotate by the motor 35, the sheet A is transported to the take-up roller 21 side. By driving the motor 43 to move the print head holder 44 in synchronization with this conveyance, the print head holder 44 moves along the guide rod 40, and ejects ink by the print head 12 fixed to the print head holder 44 to be conveyed. Printing or printing is performed on the surface of A.
[0036]
At this time, the sheet A to be conveyed slides on the support plate 14 by the platen 13 and is sucked from a number of small holes 14a and 14b formed in the support plate 14 by driving of the suction blower 17. Close contact with the platen 13 is achieved. Since the interval between the small holes 14a provided near the both ends in the width direction of the support plate 14 is smaller than the interval between the small holes 14b provided inside the support plate 14, the sheet-like material A to be conveyed is Even if an attempt is made to float near the edge in the width direction, the distance between the vicinity of the edge in the width direction of the sheet A and the small hole 14a is reduced, so that the suction force of the suction blower 17 effectively acts on the sheet A. The suction is quickly performed toward the support plate 14 to eliminate the floating. As a result, printing and printing defects due to floating near the width direction edge are effectively prevented.
[0037]
In addition, when the gap between the small holes 14a and 14b formed in the support plate is formed at a suitable interval (interval between the small holes 14a) near the periphery, the number of small holes becomes unnecessarily large. However, the number of man-hours required for drilling increases, resulting in an increase in cost. However, according to the present embodiment, the space is reduced only in the portion having the necessity, so the man-hour required for drilling increases. Therefore, an increase in cost can be suppressed.
[0038]
Further, when a large number of small holes are provided at narrow intervals, the flatness of the support plate 14 is deteriorated, the flatness of the sheet A to be sucked is reduced, and printing / printing performed on the surface of the sheet A is performed. However, in the present embodiment, the interval between the small holes 14a in the limited portion of the peripheral portion is narrowed, so that the influence on the print quality due to the decrease in flatness is minimized. Can be suppressed.
[0039]
A control method of the printing apparatus according to the present embodiment will be described with reference to FIGS. When printing and printing are performed on the sheet A while the print head 12 moves in the width direction of the sheet A, first, the transport roller 30 is driven for a predetermined time, and the sheet A on the paper feed roller side is moved. Will be sent out. Next, as shown in FIG. 5, the tension rod 20 is retracted to the left side in the figure, the link bar 23 comes off the sensor 28, and the output of the sensor 28 is turned off (time t1 in FIG. 6). Then, the sheet feeding roller 18 is rotated by the motor 37, and the sheet A is fed out by an appropriate length and supplied. As a result, the output of the tension rod 20 is restored to Sensor 28 is turned to the state shown in FIG. 4 (t2 time in Fig. 6).
[0040]
When the transport roller 30 is driven for a predetermined time and the sheet A is sent out to the platen 13 side, as shown in FIG. 5, the tension rod 22 moves to the left in the figure, and the link bar 24 detects the sensor 29. And the output of the sensor 29 is turned off (time t1 in FIG. 6). Then, the winding roller 21 is rotated by the motor 38, and the sheet A is wound up by an appropriate length. As a result, the tension rod 22 returns to the state shown in FIG. 4, and the output of the sensor 29 is turned on (time t2 in FIG. 6).
[0041]
Each time printing and printing for one scan is performed by the print head 12, the transport roller 30, the paper feed roller 18, the take-up roller 21 and the like are controlled as described above, so that the transport of the sheet A is performed. This makes it possible to smoothly perform processing such as printing by the print head.
[0042]
In the above-described embodiment, an example is described in which a platen that is a transporting sheet-like body supporting device is used for a printing apparatus that performs printing processing on a sheet-like body. However, the present invention is not limited to this, and the sheet-like body is transported and transported. The present invention can be applied to a device that holds a sheet member in the middle. For example, a sheet-shaped body may be held when cutting or die-cutting processing is performed while holding a wrapping paper or a label paper in the middle of conveyance.
[0043]
【The invention's effect】
As described above, according to the transporting sheet-like body supporting apparatus of the present invention, since the small hole interval of the portion corresponding to the vicinity of the width direction edge that is easy to float from the support plate is reduced, the floating sheet-like body is The distance between the vicinity of the width direction edge and the small hole is reduced, and the suction force from the small hole effectively acts near the width direction edge of the sheet-like body, floating can be eliminated, and the interval between the small holes is reduced. Only the portion corresponding to the vicinity of the edge in the width direction is provided, and the interval between the small holes provided inside from the portion corresponding to the edge is wider than the vicinity of the edge. There is no need to form holes, the number of man-hours for drilling does not increase unnecessarily, and the lowering of the holding function is minimized without impairing the flatness of the support plate.
[0044]
Since the printing apparatus of the present invention uses the transporting sheet-like body supporting device, lifting of the sheet-like body in the vicinity of the width direction edge is eliminated, printing quality is prevented from deteriorating, and the cost may increase. Absent.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a platen (conveying sheet-like body supporting device) according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a printing apparatus according to an embodiment of the present invention, using the platen of FIG. 1;
FIG. 3 is a plan view showing a support plate of the platen shown in FIG.
FIG. 4 is an apparatus schematic diagram for explaining the operation of the printing apparatus shown in FIG. 2;
FIG. 5 is an apparatus schematic diagram for explaining the operation of the printing apparatus shown in FIG. 2;
FIG. 6 is a diagram illustrating a control method of the printing apparatus illustrated in FIG. 2;
FIG. 7 is a diagram illustrating a problem of a conventional printing apparatus.
FIG. 8 is a diagram illustrating the reason why a floating is likely to occur near a peripheral edge in a width direction in a conventional printing apparatus.
FIG. 9 is a diagram for explaining the operation of an improvement of a conventional printing apparatus.
[Explanation of symbols]
12 Print head 13 Platen 14 Support plate 14a Small hole 14b formed near the portion corresponding to the widthwise edge of the sheet-like material Small hole 17 provided inside the portion corresponding to the widthwise edge of the sheet-like material Suction blower A sheet

Claims (5)

A transport sheet-like body supporting device for providing a large number of small holes in a support plate that supports the back surface of a sheet to be transported, and sucking the small holes to bring the sheet into a substantially close contact state with the support plate. ,
An interval in the width direction of the sheet-like body between small holes formed near a portion corresponding to the width-direction edge of the sheet-like body in the support plate is located inside from a portion corresponding to the edge. A conveyance sheet supporting device , wherein the distance between the small holes in the width direction is 50% or less . A transport sheet-like body supporting device for providing a large number of small holes in a support plate that supports the back surface of a sheet to be transported, and sucking the small holes to bring the sheet into a substantially close contact state with the support plate. ,
An interval in the transport direction of the sheet-like body between small holes formed near a portion corresponding to the width-direction edge of the sheet-like body in the support plate is located inside from a portion corresponding to the edge. conveyance sheet product supporting device you characterized in that in the conveying direction of the sheet product of pores is 50% or less of the interval. A transport sheet-like body supporting device for providing a large number of small holes in a support plate that supports the back surface of a sheet to be transported, and sucking the small holes to bring the sheet into a substantially close contact state with the support plate. ,
An interval in the width direction of the sheet-like body between small holes formed near a portion corresponding to the width-direction edge of the sheet-like body in the support plate is located inside from a portion corresponding to the edge. It is narrower than the interval in the width direction of the small holes ,
Wherein the narrow portion of the gap between the small hole, the ratio width dimension of the sheet-like body in the support plate, conveyance sheet product support device shall be the equal to or less than 30%. The widthwise interval of the sheet-like body between the small holes of the narrowed portion is 5 mm or less, and the widthwise interval of the small holes located inside the narrowed portion is 10 to 10 mm or less. The conveyance sheet supporting device according to claim 1 or 3, wherein the length is 20 mm . A print head is arranged to face a surface of the support plate of the support sheet constituting the conveying sheet support device according to any one of claims 1 to 4, on which the sheet is in close contact. Printing device .

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