JP2017019615A - Sheet floating detection device of printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet floating detection device of a printer capable of detecting 'floating' or 'folding' regardless of a generation position of 'floating' or 'folding' of a sheet or a temperature of the sheet.SOLUTION: A sheet floating detection device includes a detection plate 52 arranged near a printing cylinder 17 (conveyance member) for conveying a sheet 4, and oscillated around an axis orienting a width direction of the printing cylinder 17, and further includes a contact detection sensor 55 (oscillation detection means) for detecting oscillation of the detection plate 52. The detection plate 52 has an end edge 52a (floating detection part) extending in the width direction of the printing cylinder 17, and is oscillated by contact of a floating part of the sheet 4 with the end edge 52a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sheet floating detection device for a printing press that detects a floating portion such as a sheet floating or folding of a sheet held on a conveyance cylinder.

As one of the printing machines, there is an ink jet type digital printing apparatus as described in Patent Document 1. In this type of digital printing apparatus, printing is performed in a state where the inkjet head is close to the sheet, and therefore the sheet is conveyed while being adsorbed to the conveyance cylinder.
When the sheet is held on the conveyance cylinder, a part of the sheet may partially lift from the conveyance cylinder, and so-called “lift” may occur. In addition, the sheet may be held on the conveyance cylinder in a state where the leading end of the sheet is folded and a so-called “folding” is generated. Such a floating portion that becomes “floating” or “folded” may collide with the inkjet head.

The digital printing apparatus disclosed in Patent Document 1 includes a floating detection sensor that detects “floating” and “folding”, and performs “floating” and “folding” on a sheet that is sucked and conveyed by a conveyance cylinder. A configuration is adopted in which the ink jet head is detached from the transport drum when detected.
The floating detection sensor disclosed in Patent Document 1 is a photoelectric sensor that can measure a distance.

  By the way, in the ink jet type digital printing apparatus, the ink and the sheet are heated to a predetermined temperature in order to eject the ink with a viscosity suitable for printing and apply it to the sheet. It is known that warmed air (water vapor) rises as so-called fluctuations from the surface of the sheet warmed before printing.

JP 2013-248879 A

  The floating detection sensor disclosed in Patent Document 1 is intended to detect only a part of a sheet. The “floating” of the sheet occurs at an arbitrary position in the axial direction of the conveying cylinder. For this reason, even if a plurality of floating detection sensors are arranged side by side in the axial direction of the transport cylinder, there is a risk of detection omission.

In order to solve such a problem, it is conceivable to use a photoelectric sensor having an optical path extending in the axial direction of the transport cylinder.
This photoelectric sensor detects a laser beam that passes through the vicinity of the surface of the conveyed sheet and is blocked by “floating” or “folding”.
However, warmed air (water vapor) rises from the surface of the sheet conveyed by the digital printing device, and this causes the photoelectric sensor to malfunction, making it impossible to detect “floating” or “folding”. There is a fear.

  The present invention has been made to solve such a problem, and printing capable of detecting “floating” and “folding” regardless of the occurrence position of the sheet “floating” and “folding” and the temperature of the sheet. An object of the present invention is to provide a sheet floating detection device for a machine.

  In order to achieve this object, a sheet floating detection device for a printing press according to the present invention extends in the direction perpendicular to the conveyance direction and in the width direction along the sheet in the vicinity of a conveyance member that holds and conveys the sheet. A detection plate that is arranged in a state and is configured to be swingable about an axis that is oriented in the width direction, and a swing detection means that detects the swing of the detection plate, wherein the detection plate has the width The float detection unit extends in the direction, and swings when the float formed on the sheet held by the conveying member comes into contact with the float detection unit.

  According to the present invention, in the sheet lift detection device of the printing press, the detection plate is positioned on both sides in the width direction of the transport member via a position adjustment mechanism including a support shaft serving as a swing center of the detection plate. The distance between the sheet supported by the frame and held by the conveying member and the floating detection unit may be adjustable.

  The present invention relates to the sheet lift detection device of the printing press, wherein the swing detection means includes a contact that contacts the detection plate in a state where the floating portion is not in contact with the detection plate. May be a contact detection sensor capable of detecting a state in contact with the detection plate and a state in which the contact is detached from the detection plate.

  According to the present invention, in the sheet floating detection device of the printing press, the detection plate is formed of a conductive material, and the swing detection unit is configured so that the floating portion is not in contact with the detection plate. The first contact terminal that contacts the first contact position of the detection plate and detaches from the detection plate when the detection plate swings, and the detection in a state where the floating portion is not in contact with the detection plate. A second contact terminal that contacts the second contact position of the plate and detaches from the detection plate when the detection plate swings, wherein the first contact terminal or the second contact terminal is It may be possible to detect a state in contact with the detection plate and a state in which the detection plate is detached from the detection plate.

According to the present invention, the detection plate swings when the floating portion of the sheet comes into contact with the floating detection portion of the detection plate, and the swing detection means detects this swing. Since the detection plate extends in the width direction of the conveying member, the detection plate comes into contact with the floating portion regardless of the position of the floating portion, and swings due to this contact. Further, the swing detection means detects the swing of the detection plate, and does not detect light passing in the vicinity of the sheet.
Accordingly, it is possible to provide a sheet lift detection device for a printing press that can detect “lift” or “fold” regardless of the occurrence position of the sheet “lift” or “fold” and the sheet temperature.

1 is a side view illustrating a schematic configuration of a printing press including a sheet floating detection device according to the present invention. It is sectional drawing which expands and shows the principal part by 1st Embodiment. It is a top view for demonstrating the structure of the detection board and position adjustment mechanism by 1st Embodiment. In FIG. 3, the fracture position of FIG. 2 is indicated by the line II-II. It is the IV-IV sectional view taken on the line in FIG. It is a side view of a position adjustment mechanism. It is a schematic diagram for demonstrating the structure of a position adjustment mechanism. It is a block diagram which shows the structure of the control system by 1st Embodiment. It is sectional drawing which expands and shows the principal part by 2nd Embodiment. It is a block diagram which shows the structure of the control system by 2nd Embodiment. It is a top view for demonstrating the structure of the detection board and position adjustment mechanism by 2nd Embodiment.

(First embodiment)
Hereinafter, an embodiment of a sheet floating detection device for a printing press according to the present invention will be described in detail with reference to FIGS.
A printing machine 1 shown in FIG. 1 is a so-called digital printing machine, which transports a sheet 4 from a feeder unit 2 located at the rightmost position in FIG. 1 to a printing unit 3 and prints on one or both sides of the sheet 4 in the printing unit 3. Is to be applied. The sheet 4 printed by the printing unit 3 is sent to the delivery unit 5 and discharged to the delivery pile 6.

  The feeder unit 2 has a structure in which the sheet 4 is transferred from the feeder pile 11 to the feeder board 13 by the soccer 12. The soccer 12 is connected to the intermittent paper supply valve 14 and operates in one of a form in which the sheet 4 is continuously fed and a form in which the sheet 4 is intermittently fed. When printing is performed only on the surface of the sheet 4, the soccer 12 continuously sends the sheet 4 to the feeder board 13. On the other hand, when printing is performed on the front and back surfaces of the sheet 4, the soccer 12 intermittently sends the sheet 4 to the feeder board 13.

The printing unit 3 includes a supply side transfer cylinder 16 in which the sheet 4 supplied from the feeder unit 2 is conveyed by the sheet supply side swing device 15, a print cylinder 17 to which the sheet 4 is fed from the supply side transfer cylinder 16, and printing And a plurality of transfer cylinders 18 to 21 for feeding the subsequent sheet 4.
The supply side transfer cylinder 16 includes a heater (not shown) that heats the sheet 4 to a predetermined temperature.
The printing cylinder 17 conveys the sheet 4 while adsorbing and holding it, and includes three conveyance surfaces 22 on which the sheet 4 is adsorbed, and three sets of gripper devices positioned between these conveyance surfaces 22. 23 and the like. That is, the printing cylinder 17 according to this embodiment is a so-called triple cylinder. In this embodiment, the printing cylinder 17 constitutes a “conveying member” in the present invention.

  As shown in FIG. 2, the gripper device 23 includes a claw member 24 and a claw base 25. Although not shown in detail, the nail member 24 is provided on a nail shaft extending in the axial direction of the printing cylinder 17 and rotates with respect to the printing cylinder 17 together with the nail shaft. The claw base 25 is fixed to the printing cylinder 17 and sandwiches the downstream end portion in the conveyance direction of the sheet 4 in cooperation with the front end portion of the claw member 24. These claw members 24 and claw bases 25 are respectively provided at a plurality of positions arranged at predetermined intervals in the axial direction of the printing cylinder 17. That is, the nipping portions composed of the claw member 24 and the claw base 25 are arranged at a predetermined interval in the axial direction of the printing cylinder.

The printing cylinder 17 is driven and rotated by a cylinder driving device 31 (see FIG. 7) of the printing machine 1. The operation of the cylinder driving device 31 is controlled by a control device 32 described later.
In addition, the printing unit 3 includes a sensor unit 34 of a sheet floating detection device 33 to be described later on the downstream side in the sheet conveyance direction from the supply side transfer cylinder 16, first to fourth inkjet heads 35 to 38, and an ink drying lamp 39. And. Although the details will be described later, the sheet presence / absence detection device 34 is for detecting a floating portion of the sheet 4 conveyed by the printing cylinder 17. The floating portion is a convex portion of the sheet 4 that is partially lifted from the printing cylinder 17 by so-called “floating” or “folding”.

  The first to fourth inkjet heads 35 to 38 have nozzles (not shown) facing the sheet 4, and perform printing by ejecting ink droplets from the nozzles to the sheet 4. The nozzle is separated from the sheet 4 in a state where a minute gap is formed between the nozzle and the sheet 4. If the sheet 4 has convex portions such as “floating” as described above or “folding” in which a part of the sheet 4 is folded and floated from the printing cylinder 17, the sheet 4 is in the first to fourth inkjet heads 35 to 35. By being conveyed to a position facing 38, the convex portion collides with the nozzle.

  The first to fourth ink jet heads 35 to 38 according to this embodiment are movable between a printing position positioned at the time of printing and a retreat position where the distance between the printing cylinder 17 is wider than the printing position. It is configured. These first to fourth ink jet heads 35 to 38 are driven by the ink jet head driving device 41 (see FIG. 7) of the printing press 1 and move between the printing position and the retracted position. The operation of the inkjet head drive device 41 is controlled by a control device 32 described later.

  The ink drying lamp 39 is for curing the ink applied to the sheet 4 by the first to fourth inkjet heads 35 to 38. The ink drying lamp 39 irradiates the sheet 4 with infrared rays or ultraviolet rays. When the ink is irradiated with infrared rays or ultraviolet rays, the temperature rises and dries (solidifies).

  The plurality of conveying cylinders described above include a first discharge side transfer cylinder 18 that receives the sheet 4 from the printing cylinder 17, a second discharge side transfer cylinder 19 that receives the sheet 4 from the first discharge side transfer cylinder 18, and A third discharge-side transfer cylinder 20 and a pre-reverse double cylinder 21 that receive the sheet 4 from the second discharge-side transfer cylinder 19. The sheet 4 to be printed on the back surface is conveyed from the second discharge side transfer cylinder 19 to the pre-inversion double cylinder 21. The sheet 4 printed on only the front surface and the sheet 4 printed on both front and back surfaces are sent from the second discharge side transfer cylinder 19 to the third discharge side transfer cylinder 20 and delivered by the delivery belt 42. Sent to pile 6.

  The supply-side transfer cylinder 16, the first discharge-side transfer cylinder 18, the second discharge-side transfer cylinder 19, the third discharge-side transfer cylinder 20, and the pre-inversion double cylinder 21 are used to transfer the sheet 4. In order to perform this, each of the gripper devices 43 to 47 is provided. These gripping claw devices 43 to 47 are equivalent to the gripping claw device 23 of the printing cylinder 17 and are configured to hold the downstream end portion in the conveying direction of the sheet 4 and hold it.

  A reversing swing device 48 for feeding the sheet 4 from the pre-reversing double cylinder 21 to the printing cylinder 17 is disposed between the pre-reversing double cylinder 21 and the supply-side transfer cylinder 16. The reversing swing device 48 grips the upstream end in the conveying direction of the sheet 4 sent by the pre-reversing double cylinder 21 and sends the sheet 4 to the printing cylinder 17 with the surface facing the printing cylinder 17.

  As shown in FIG. 3, the sensor unit 34 provided in the vicinity of the printing cylinder 17 includes a support bracket 51 and a detection plate 52 that extend along the printing cylinder 17 in the axial direction of the printing cylinder 17 (left and right in FIG. 3). Etc. Although the details will be described later, the detection plate 52 is configured to be swingable about an axis C1 directed in the axial direction of the printing cylinder 17, and swings when the floating portion of the sheet 4 comes into contact. .

The support bracket 51 is bridged between a pair of frames 53 positioned on both sides of the printing cylinder 17 in the axial direction. Although not shown, the pair of frames 53 rotatably support shafts provided at both ends in the axial direction of the printing cylinder 17.
As shown in FIG. 2, a support plate 54 that extends downward is attached to the center portion of the support bracket 51 in the longitudinal direction. The support plate 54 has a horizontal portion 54 a that extends substantially horizontally just below the support bracket 51.

A contact detection sensor 55, an adjustment bolt 56, and a stopper plate 57 are attached to the horizontal portion 54a. The stopper plate 57 is overlaid on the lower surface of the horizontal portion 54a. The contact detection sensor 55 and the adjustment bolt 56 penetrate the horizontal portion 54a and the stopper plate 57 in the vertical direction, respectively.
The contact detection sensor 55 detects the presence or absence of swinging of a detection plate 52 described later, and includes a contact 58 that protrudes downward from the lower end of the sensor main body 55a attached to the horizontal portion 54a. The sheet floating detection device 33 according to this embodiment includes the contact detection sensor 55, the detection plate 52 described above, the control device 32 described later, and the like.

  The contact 58 is supported by the sensor body 55a so as to be movable in the vertical direction. The sensor body 55a detects the movement of the contact 58 and sends the detection result to the control device 32 as a detection signal. As shown in FIG. 4, the contact 58 is in contact with the wide portion 59 of the detection plate 52 described later from above. The contact 58 is in contact with the wide portion 59 in a state where the floating portion of the sheet 4 is not in contact with the detection plate 52, and the detection plate 52 swings and the wide portion 59 moves downward. Leave 59. The contact detection sensor 55 according to this embodiment can detect a state where the contact 58 is in contact with the wide portion 59 and a state where the contact 58 is detached from the wide portion 59. In this embodiment, the contact detection sensor 55 constitutes the “swing detection means” referred to in the present invention.

The adjustment bolt 56 is for determining the position (swinging angle) of the detection plate 52 that contacts the contact 58, and the lower end is in contact with the wide portion 59 of the detection plate 52 from above as shown in FIG. And is fixed to the support plate 54.
The stopper plate 57 is for restricting excessive swinging of the detection plate 52 described later, and has a contact portion 57a with which the excessively swinging detection plate 52 contacts as shown in FIG. .

The detection plate 52 is formed in a thin strip shape with a metal material, and as shown in FIG. 3, in the vicinity of the printing cylinder 17, in a direction orthogonal to the sheet conveyance direction and in the axial direction of the printing cylinder 17. It is arranged in an extended state. In this embodiment, the axial direction of the printing cylinder 17 corresponds to the “width direction along the sheet” in the present invention.
A wide portion 59 where the contact detection sensor 55 and the adjusting bolt 56 are in contact with each other is provided in the center portion of the detection plate 52 in the longitudinal direction and on the side opposite to the printing cylinder 17. The wide portion 59 is formed wider than other portions of the detection plate 52.
An edge 52a of the detection plate 52 adjacent to the printing cylinder 17 extends linearly without interruption in the axial direction of the printing cylinder 17. In this embodiment, the end edge 52a corresponds to the “floating detector” in the present invention.

  The detection plate 52 according to this embodiment is attached to a support shaft 61 extending in the axial direction of the printing cylinder 17 by a plurality of mounting bolts 62, and is attached to the frame 53 via a position adjustment mechanism 63 including the support shaft 61. It is swingably supported. The support shaft 61 is disposed on the opposite side of the printing cylinder 17 from the position of the center of gravity of the detection plate 52 in the width direction of the detection plate 52 (direction perpendicular to the axial direction of the printing cylinder 17). Therefore, when the support shaft 61 is rotatable, the detection plate 52 is brought into a state where the end edge 52a is urged downward by gravity, and the detection plate 52 is stopped by the wide portion 59 coming into contact with the adjustment bolt 56 from below. . As shown in FIG. 2, the detection plate 52 is installed in the vicinity of the edge 52a at a position where the printing cylinder 17 moves upward from below. In FIG. 2, the rotation direction of the printing cylinder 17 is indicated by an arrow R.

The position adjustment mechanism 63 is provided for each frame 53, and supports one end side and the other end side of the detection plate 52, respectively. One position adjustment mechanism 63 that supports one end side of the detection plate 52 and the other position adjustment mechanism 63 that supports the other end side of the detection plate 52 are the same. For this reason, in this embodiment, only one position adjusting mechanism 63 is shown in FIG. 3, and the other position adjusting mechanism 63 is not shown.
As shown in FIGS. 3 and 5, the position adjustment mechanism 63 includes a plurality of members, and is supported by a support plate 64 (see FIGS. 3 and 5) that extends upward from the outer side of the frame 53. The plurality of members constituting the position adjustment mechanism 63 are a position adjustment member 66 formed of a fan-like plate rotatably supported on a support plate 64 by a support shaft 65, an outer peripheral portion of the position adjustment member 66, and a support plate 64. And a support shaft 61 that is rotatably supported by a position adjusting member 66 via a bearing 68.

The support shaft 65 passes through the support plate 64 and is connected to the position adjustment member 66.
The position adjustment member 66 is positioned above the frame 53 with the outer peripheral portion having a circular arc of the fan positioned on the upper side.
The cylinder assembly 67 is configured by combining a first cylinder 71 and a second cylinder 72, and the axial directions of the first and second cylinders 71 and 72 are orthogonal to the axial direction of the printing cylinder 17. In this state, it is positioned above the frame 53. The first cylinder 71 and the second cylinder 72 are combined in a state where the piston rods 71 a and 72 a are directed outside the cylinder assembly 67.

The piston rod 71 a of the first cylinder 71 is rotatably connected to the outer peripheral portion of the position adjusting member 66 via a support shaft 73. The axial direction of the support shaft 73 is a direction parallel to the axial direction of the printing cylinder 17.
The piston rod 72 a of the second cylinder 72 is rotatably supported by the support plate 64 via a support shaft 74.
The first cylinder 71 and the second cylinder 72 are air cylinders, and are connected to an air pressure source (not shown) via control valves 75 and 76 (see FIG. 7), respectively. The operations of the first cylinder control valve 75 and the second cylinder control valve 76 are controlled by a control device 32 described later.

  In the cylinder assembly 67 according to this embodiment, the first cylinder control valve 75 and the second cylinder control valve 76 are controlled by the control device 32, so that the first to third operations having different overall lengths are performed. It is switched to any one of the forms. In the first operation mode, as shown by the solid line in FIG. 5, the piston rods 71a and 72a of the first and second cylinders 71 and 72 retreat, respectively. The second operation mode is a mode in which the piston rod 71a of the first cylinder 71 moves forward and the piston rod 72a of the second cylinder 72 moves backward as indicated by a two-dot chain line A in FIG. In the third operation mode, as indicated by a two-dot chain line B in FIG. 5, the piston rods 71a and 71b of the first and second cylinders 71 and 72 are respectively advanced.

  The overall length of the cylinder assembly 67 is the shortest when the first operation mode is adopted, and is the longest when the third operation mode is adopted. If the 2nd operation form is taken, the full length of cylinder assembly 67 will be the length between the full length in the 1st operation form, and the full length in the 3rd operation form. By changing the overall length of the cylinder assembly 67, the angle when the position adjusting member 66 rotates about the support shaft 65 changes.

  The support shaft 61 is positioned in a position eccentric with respect to the support shaft 65 that is the rotation center of the position adjustment member 66 in the position adjustment member 66. As shown in FIG. 3, the axis C <b> 1 of the support shaft 61 is eccentric from the axis C <b> 2 (see FIG. 3) of the support shaft 65 by a predetermined distance d. Since the support shaft 61 is eccentric with respect to the support shaft 65 in this way, the support shaft 61 is parallel to a direction orthogonal to the axial direction of the printing cylinder 17 as the position adjustment member 66 rotates together with the detection plate 52. Moving.

The direction in which the support shaft 65 moves in parallel with the detection plate 52 is a direction along the main surface of the detection plate 52 as shown in FIG. FIG. 6 is enlarged to facilitate understanding of the behavior of the support shaft 65 and the detection plate 52. The inter-axis distance d between the support shaft 61 and the support shaft 65 is actually 1 mm or less.
The support shaft 65 shown in FIG. 6 is drawn with its position changed for each operation mode of the cylinder assembly 67. The support shaft 61 moves along a virtual circle 77 centered on the support shaft 65. When the cylinder assembly 67 adopts the first operation mode, the interval between the detection plate 52 and the printing cylinder 17 becomes the first interval D1. In addition, since the cylinder assembly 67 adopts the second operation mode, the interval between the detection plate 52 and the printing cylinder 17 becomes the second interval D2, and the cylinder assembly 67 further operates in the third operation mode. As a result, the distance between the detection plate 52 and the printing cylinder 17 becomes the third distance D3. The interval D2 is wider than the interval D1, and the interval D3 is wider than the interval D2. For this reason, according to this position adjustment mechanism 63, the distance between the sheet 4 held on the printing cylinder 17 and the edge 52a (floating detection part) of the detection plate 52 can be adjusted, and according to the thickness of the sheet 4 to be used. Thus, the position of the detection plate 52 can be changed.

  When the detection plate 52 is installed at a position that is closest to the thickness of the sheet 4 to be used among the intervals D1 to D3, the sheet 4 is conveyed by the printing cylinder 17 and passes near the detection plate 52. In addition, the flat portion that is not the floating portion of the sheet 4 does not contact the detection plate 52, and only the floating portion of the sheet 4 contacts the detection plate 52. The floating portion contacts the edge 52 a of the detection plate 52. When the floating portion comes into contact with the end edge 52 a, the end edge 52 a is pushed up by the floating portion, and the detection plate 52 swings around the support shaft 61.

As shown in FIG. 7, the control device 32 includes a print control unit 81, a cylinder control unit 82, and a sheet lift determination unit 83. The print control unit 81 controls operations of various apparatuses necessary for printing on the sheet 4 by the printing machine 1.
The cylinder controller 82 controls the operations of the first cylinder control valve 75 and the second cylinder control valve 76.
The sheet floating determination unit 83 determines the presence or absence of the floating part of the sheet 4 based on the detection signal sent from the contact detection sensor 55, and when the floating part is detected in the sheet 4, the cylinder driving device 31 and the inkjet head drive The apparatus 41 is caused to execute an operation at the time of abnormality.

The presence / absence of the floating portion of the sheet 4 is determined by comparing the amount of movement of the contact 58 of the contact detection sensor 55 with a predetermined threshold. The fact that the contact 58 has moved means that the detection plate 52 has come into contact with the floating portion of the sheet 4 and has swung.
For this reason, the sheet floating determination unit 83 determines that a floating portion is generated in the sheet 4 when the movement amount of the contact 58 is larger than the threshold value.

When the cylinder driving device 31 performs an operation at the time of abnormality, all the conveyance cylinders including the printing cylinder 17 are stopped. When the ink jet head drive device 41 performs an abnormal operation, the first to fourth ink jet heads 35 to 38 stop printing and retreat to the retreat position.
For this reason, if the floating part has arisen in the sheet | seat 4 hold | maintained at the printing cylinder 17, when this floating part passes the sensor part 34, the printing machine 1 will stop.

According to the sheet floating detection device 33 of the printing press 1 configured as described above, when a floating portion is generated in the sheet 4 held by the printing cylinder 17, the floating portion is formed on the edge 52 a of the detection plate 52. Contact. Then, the detection plate 52 is pushed up by the floating portion and swings. Since the detection plate 52 extends in the axial direction of the printing cylinder 17, the detection plate 52 contacts the floating portion regardless of the position of the floating portion, and swings due to this contact. At this time, the contact detection sensor 55 detects the swing of the detection plate 52, and the control device 32 stops the printing cylinder 17 and moves the first to fourth inkjet heads 35 to 38 to the retracted position. The contact detection sensor 55 detects the swing by contacting the detection plate 52, and does not detect the light passing through the vicinity of the sheet 4. Therefore, the temperature of the sheet 4 is detected when detecting the swing of the detection plate 52. Will not be affected.
Therefore, according to this embodiment, the sheet floating detection device for a printing press capable of detecting “floating” and “folding” regardless of the occurrence position of “floating” or “folding” of the sheet 4 and the temperature of the sheet 4. Can be provided.

The printing cylinder 17 according to this embodiment is rotatably supported by frames 53 located on both sides in the axial direction of the printing cylinder 17. The detection plate 52 is supported by the frame 53 via a position adjustment mechanism 63 including a support shaft 61 that serves as the center of oscillation of the detection plate 52. The position adjustment mechanism 63 includes a position adjustment member 66 that is rotatably supported by the support plate 64. The support shaft 61 is positioned at a position eccentric to the rotation center (support shaft 65) of the position adjustment member 66 in the position adjustment member 66.
For this reason, the position of the detection plate 52 is changed by turning the position adjusting member 66 with respect to the support plate 64. This means that the distance between the detection plate 52 and the printing cylinder 17 can be changed. Therefore, according to this embodiment, since the position of the detection plate 52 can be changed according to the thickness of the sheet 4 to be used, it can be used without being restricted by the thickness of the sheet 4 and is highly versatile. A sheet floating detection device for a printing press can be provided.

The contact detection sensor 55 according to this embodiment includes a contact 58 that contacts the detection plate 52 in a state where the floating portion of the sheet 4 is not in contact with the detection plate 52. The contact detection sensor 55 can detect a state where the contact 58 is in contact with the detection plate 52 and a state where the contact 58 is detached from the detection plate 52.
For this reason, according to this embodiment, since the swing of the detection plate 52 can be directly detected by the contact detection sensor 55, a sheet floating detection device for a printing press with high detection accuracy can be provided.

(Second Embodiment)
The swing detection means can be configured as shown in FIGS. In these drawings, members that are the same as or equivalent to those described with reference to FIGS. 1 to 7 are given the same reference numerals, and detailed descriptions thereof are omitted as appropriate.

The detection plate 91 of the sheet floating detection device 33 shown in FIG. 8 is formed in a thin strip shape with a conductive material. The detection plate 91 is inclined in a direction in which an edge 91a close to the printing cylinder 17 is lower than the support shaft 61, and is held in this inclined state. The edge 91a according to this embodiment is configured by a corner formed by bending the end of the detection plate 91 along the printing cylinder 17 toward the downstream side in the sheet conveying direction.
The detection plate 91 is held such that the first contact terminal 92 and the second contact terminal 93 (see FIG. 10) are in contact with the detection plate 91 at both ends in the longitudinal direction (the axial direction of the printing cylinder 17). It is done by. As shown in FIG. 10, the first contact terminal 92 is in contact with a first contact position 94 that is one end portion of the detection plate 91 in the longitudinal direction. The second contact terminal 93 is in contact with a second contact position 95 which is the other end portion in the longitudinal direction of the detection plate 91. In this embodiment, the end edge 91a corresponds to the “floating detector” in the present invention.

  The detection plate 91 according to this embodiment is installed at a position where the printing cylinder 17 moves from below to above in the vicinity of the edge 91a. When the detection plate 91 is supported and inclined from below by the first and second contact terminals 92 and 93 as described above, the sheet 4 having the floating portion is conveyed, so that the floating portion of the detection plate 91 is The end edge 91 a is pushed upward by coming into contact with the end edge 91 a, and the detection plate 91 swings around the support shaft 61. For this reason, as shown in FIG. 8, the first contact terminal 92 is in contact with the first contact position 94 of the detection plate 91 in a state where the floating portion of the sheet 4 is not in contact with the detection plate 91, and is detected. The plate 91 is detached from the detection plate 91 by swinging. On the other hand, the second contact terminal 93 comes into contact with the second contact position 95 of the detection plate 91 in a state where the floating portion of the sheet 4 is not in contact with the detection plate 91, and the detection plate 91 swings. Detach from the detection plate 91.

The first contact terminal 92 and the second contact terminal 93 according to this embodiment are configured using bolts 96, respectively. The bolt 96 passes through the support plate 97 and is fixed to the support plate 97 by a pair of mounting nuts 98 and 99. A cap nut 100 that comes into contact with the detection plate 91 is screwed onto the tip of the bolt 96. The support plate 97 is formed of a plastic material that is an insulating material, and is fixed to the frame 53 via the mounting member 101. As shown in FIG. 10, the support plate 97 and the attachment member 101 are provided for each of the first and second contact terminals 92 and 93.
A crimp terminal 102 is provided between the support plate 97 and the nut 99. The crimp terminal 102 is connected to the control device 32 by a lead wire 103.

  The position adjusting mechanism 63 according to this embodiment employs a configuration in which the position of the position adjusting member 66 in the rotational direction can be changed by one cylinder 104. The operation of the cylinder 104 is controlled by the control device 32 using a control valve 105 (see FIG. 9). Also in this embodiment, the support shaft 61 is provided at a position eccentric from the support shaft 65 of the position adjusting member 66 by a distance d.

The sheet floating determination unit 83 of the control device 32 according to this embodiment determines whether or not there is conduction between the first contact terminal 92 and the second contact terminal 93, and when there is no conduction, the sheet floating determination unit 83 Is determined to have occurred.
For this reason, the swing detection means according to this embodiment has a switch 106 (see FIG. 9) in which the detection plate 91 selectively connected to the first contact terminal 92 and the second contact terminal 93 is a movable piece. It is constituted by. This means that the sheet floating detection device 33 according to this embodiment has a state where the first contact terminal 92 or the second contact terminal 93 is in contact with the detection plate 91 and a state where the sheet contact detection device 91 is detached from the detection plate 91. It means that it can be detected.

  Therefore, according to this embodiment, the presence or absence of the floating portion of the seat 4 can be detected by the switch 106 having a simple structure, and the contact detection sensor 55 having the contact 58 that contacts the detection plate 52 is used as the swing detection means. Compared with the case where it does, manufacturing cost can be held down low. As a result, by adopting this embodiment, a sheet floating detection device for a printing press can be provided at low cost.

  In the first and second embodiments described above, an example in which the conveyance member that conveys the sheet 4 is the printing cylinder 17 has been described. However, the sheet floating detection device according to the present invention can be applied to any conveyance device as long as the conveyance device conveys the sheet.

  In the first and second embodiments described above, the position adjustment mechanism 63 configured to rotate the position adjustment member 66 having the support shaft 61 is shown. However, the position adjustment mechanism can be changed as appropriate without being restricted by such a limitation. The position adjusting mechanism may adjust the position of the detection plate by sliding the support shaft 61 with an actuator such as an air cylinder, for example.

  DESCRIPTION OF SYMBOLS 1 ... Printing machine, 4 ... Sheet, 17 ... Printing cylinder, 33 ... Sheet floating detection apparatus, 52, 91 ... Detection plate, 52a, 91a ... Edge (floating detection part), 53 ... Frame, 55 ... Contact detection sensor ( (Oscillation detection means), 58 ... contact, 55 ... contact detection sensor, 61 ... support shaft, 63 ... position adjustment mechanism, 66 ... position adjustment member, 92 ... first contact terminal, 93 ... second contact terminal, 94: first contact position, 95: second contact position, 106: switch (swing detection means).

Claims (4)

It is arranged in the vicinity of the conveying member that holds and conveys the sheet in a state that is perpendicular to the conveying direction and extends in the width direction along the sheet, and is configured to be swingable about an axis that points in the width direction. Detection plate,
A swing detecting means for detecting swing of the detection plate;
The detection plate has a floating detection portion extending in the width direction, and swings when a floating portion generated in a sheet held by the conveying member comes into contact with the floating detection portion. A sheet lift detection device for a printing press. In the sheet floating detection device of the printing press according to claim 1,
The detection plate is supported by frames positioned on both sides in the width direction of the transport member via a position adjustment mechanism including a support shaft serving as a swing center of the detection plate.
A sheet lift detection apparatus for a printing press, wherein a distance between the sheet held by the transport member and the lift detection unit is adjustable. In the sheet floating detection device for a printing press according to claim 1 or 2,
The swing detection means includes a contact that contacts the detection plate in a state where the floating portion is not in contact with the detection plate, and the contact is in contact with the detection plate; A sheet floating detection apparatus for a printing press, wherein the sheet floating detection apparatus is a contact detection sensor capable of detecting a state in which a child is detached from the detection plate. In the sheet floating detection device for a printing press according to claim 1 or 2,
The detection plate is formed of a conductive material,
The swing detection means includes
A first contact terminal that contacts the first contact position of the detection plate in a state where the floating portion is not in contact with the detection plate and detaches from the detection plate when the detection plate swings;
A second contact terminal that comes into contact with the second contact position of the detection plate in a state where the floating portion is not in contact with the detection plate and is separated from the detection plate when the detection plate swings; And
A sheet floating detection device for a printing press, wherein the first contact terminal or the second contact terminal is in contact with the detection plate and can be detected from the detection plate. .

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