JP2016203440A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer which prevents a sheet from being damaged or contaminated when printing is performed while stopping a part of a printing unit.SOLUTION: A printer comprises: an impression cylinder 93 (a conveying cylinder); a number cylinder 31 (a printing cylinder) moving between a printing position and a retreat position; a first power transmission path 51 for connecting the impression cylinder 93 and the number cylinder 31 in an integrally rotatable manner; a first clutch 58 (a first connecting/disconnecting mechanism) provided in the first power transmission path 51; an encoder 57 (phase detection means) for detecting a rotational phase of the number cylinder 31; and a control device for controlling the operation of the first clutch 58 and changing the position of the number cylinder 31 in a rotation direction. A peripheral surface of the number cylinder 31 has an effective part 44 and a non-effective part 45. When the number cylinder 31 moves to the retreat position and printing is stopped by the number cylinder 31, the control device brings the first clutch 58 into a disconnected state and brings the number cylinder 31 into a state in which the non-effective part 45 faces the impression cylinder 93 on the basis of a detection result of the encoder 57.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a printing machine including a printing cylinder that can be brought into contact with and separated from a conveyance cylinder that holds and conveys a sheet.

  Conventionally, a printing press including a plurality of printing units sometimes performs printing in a state where some printing units are suspended. This type of printing unit includes a conveyance cylinder that holds and conveys a sheet, and a printing cylinder that can come into contact with and separate from the conveyance cylinder. The printing cylinder is moved away from the transport cylinder when the printing unit is at rest. As a conventional printing machine provided with such a printing cylinder, there is one described in Patent Document 1, for example.

  The printing machine disclosed in Patent Document 1 is for printing a number on a sheet, and includes an impression cylinder that conveys the sheet and a number cylinder that can contact and separate from the impression cylinder. A number cylinder is provided with a number of numbering devices. These numbering devices are arranged in the circumferential direction and the axial direction on the outer peripheral portion of the numbering cylinder.

  In recent years, a printing machine having a number printing unit having a number cylinder as shown in Patent Document 1 and a printing unit that performs sheet-fed printing using a plate cylinder, for example, has been developed and used. In this type of printing machine, there are cases where only sheet-fed printing is performed without number printing. In this case, the numbering cylinder is detached from the impression cylinder (conveyance cylinder) that holds and conveys the sheet. Then, the number printing unit conveys the sheet by the impression cylinder without performing number printing, and passes the sheet through the number printing unit.

JP 2000-309078 A

  If the sheet is conveyed by the impression cylinder with the number cylinder separated from the impression cylinder, the sheet may be damaged or the sheet may become dirty. This is because the numbering cylinder rotates in conjunction with the impression cylinder, and the numbering device of the numbering cylinder and the sheet come into contact with each other.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a printing machine in which a sheet is not damaged or soiled when printing is performed with some printing units suspended. And

  In order to achieve this object, a printing press according to the present invention is provided in at least one printing unit in which printing is paused among a plurality of printing units that apply liquid to a sheet, and holds and conveys the sheet. A transport cylinder, a printing cylinder configured to be movable between two positions consisting of a printing position in contact with the transport cylinder and a retracted position away from the transport cylinder, and the transport cylinder and the printing cylinder are integrated. A first power transmission path that is rotatably connected; a first connection / disconnection mechanism that is provided in the first power transmission path and that switches between a state in which power is transmitted and a state in which power is interrupted; A phase detection unit that detects a rotation phase; and a control device that controls the operation of the first connection / disconnection mechanism and changes the position of the printing cylinder in the rotation direction based on the detection result of the phase detection unit; Of the printing cylinder The surface includes an effective surface for transferring liquid in contact with a sheet held by the transport cylinder in a state where the printing cylinder is positioned at the printing position, and the printing cylinder is positioned at the printing position. Ineffective state that does not come into contact with the conveyance cylinder or the sheet even when the printing cylinder is in a state where the printing cylinder is moved to the retracted position and printing by the printing cylinder is suspended In addition, the first connecting / disconnecting mechanism is in a state where transmission of power is interrupted, and the printing cylinder is set in a state in which the ineffective surface faces the conveying cylinder based on the detection result of the phase detection means. It is what has.

  The present invention further provides a printing cylinder connected to the printing cylinder via a second power transmission path different from the first power transmission path, and having a function of rotating the printing cylinder alone. A drive device and a second connecting / disconnecting mechanism that is provided in the second power transmission path and switches between a state in which power is transmitted and a state in which power is interrupted may be provided.

  In the present invention, the printing cylinder in which printing is paused maintains the stopped state because the transmission of power is interrupted by the first connecting / disconnecting mechanism. The gap between the non-effective surface and the conveyance cylinder in the stopped state is wider than the gap between the effective surface and the conveyance cylinder in a state where the effective surface faces the conveyance cylinder. That is, the printing cylinder in which printing is paused stops in a state where a wide space is formed between the printing cylinder and the conveyance cylinder.

  For this reason, according to the present invention, it is possible to prevent the sheet from coming into contact with the printing cylinder when the sheet is conveyed by the conveying cylinder and passes through the vicinity of the printing cylinder where printing is suspended. Therefore, according to the present invention, it is possible to provide a printing machine in which a sheet is not damaged or soiled when printing is performed with some printing units suspended.

1 is a side view of a printing press according to the present invention. It is a side view which shows the schematic structure of a number cylinder. It is a front view which shows the schematic structure of a number cylinder. It is a side view which shows the state in which a number cylinder is located in a retracted position. It is a side view which shows the structure of the drive system of a number cylinder. It is a block diagram for demonstrating a control apparatus. It is a side view which shows the state which made the notch face the impression cylinder and the number cylinder stopped. FIG. 3 is a side view showing a part of a printing unit for sheet-fed printing in which the present invention is applied to a rubber cylinder. It is a side view which shows a part of coating unit with which this invention was applied to the varnish transfer cylinder.

(First embodiment)
Hereinafter, an embodiment of a printing machine according to the present invention will be described in detail with reference to FIGS. Here, an example when the present invention is applied to a number cylinder of a number printing unit incorporated in a sheet-fed offset printing machine will be described.

A printing machine 1 shown in FIG. 1 is a sheet-fed offset printing machine, which feeds a sheet 2 as a printing medium from right to left in FIG. 1, and performs printing of a pattern and number printing on the sheet 2. The printing machine 1 includes a sheet supply unit 3 that supplies a sheet 2, a printing unit 4 that performs printing on the sheet 2, a sheet discharge unit 5 that discharges the sheet 2, and the like.
The sheet supply unit 3 includes a soccer device (not shown) that sucks up a large number of stacked sheets 2 one by one, and a feeder board 6 that sends the sheets 2 adsorbed by the soccer device to the printing unit 4. .

The printing unit 4 includes first to fourth printing units 11 to 14 for printing, for example, a pattern on the sheet 2 and a number printing unit 15 for printing a number on the sheet 2. Each of the first to fourth printing units 11 to 14 includes an impression cylinder 16, a rubber cylinder 17, a plate cylinder 18, an ink supply device 19, a water supply device 20, and the like.
The impression cylinder 16 includes a claw device (not shown) that holds the sheet 2 and has a function of feeding the sheet 2 downstream in the conveying direction.

Between the impression cylinders 16 of the first to fourth printing units 11 to 14, first to third transfer cylinders 21 to 23 are provided. The first to third transfer cylinders 21 to 23 have a claw device (not shown) for holding the sheet 2, and the impression cylinder positioned downstream from the impression cylinder 16 positioned upstream in the conveying direction. Send to 16. The impression cylinder 16 of the fourth printing unit 14 sends the sheet 2 to a fourth transfer cylinder 25 located between the impression cylinder 24 of the number printing unit 15 described later. The fourth transfer cylinder 25 has the same configuration as the first to third transfer cylinders 21 to 23.
The rubber cylinder 17 rotates while coming into contact with the impression cylinder 16 to transfer the ink onto the sheet 2 sandwiched between the impression cylinder 16.

The plate cylinders 18 of the first to fourth printing units 11 to 14 are in contact with the rubber cylinder 17 and transfer ink to the rubber cylinder 17.
The ink supply device 19 supplies ink to the plate cylinder 18. The water supply device 20 supplies dampening water to the plate cylinder 18.

The number printing unit 15 includes a pressure cylinder 24 to which the sheet 2 is fed from the fourth transfer cylinder 25, a number cylinder 31 opposed to the impression cylinder 24, and an ink supply device located near the upper portion of the number cylinder 31 in FIG. 32 etc. are provided. In this embodiment, the impression cylinder 24 corresponds to the “conveyance cylinder” in the present invention, and the number cylinder 31 corresponds to the “printing cylinder” in the present invention.
2 and 3, the number cylinder 31 includes a number cylinder shaft 33, a ring member 34 formed of a cylindrical body fixed to the number cylinder shaft 33 in a state where the number cylinder shaft 33 penetrates, and the ring. A plurality of numbering devices 36 provided on the outer peripheral portion of the member 34 via an adapter 35 are provided. As shown in FIG. 3, the number cylinder shaft 33 of the number cylinder 31 is rotatably supported by first and second frames 37 and 38 located on both sides of the number cylinder 31 via eccentric bearings 39 described later. Yes.

  The numbering unit 36 includes a rotatable ring ring 41 and a ring ring drive mechanism (not shown) that rotates the ring ring 41 intermittently. It is provided at each position. The numbering devices 36 according to this embodiment are respectively arranged at five locations in the rotational direction of the numbering cylinder 31. In addition, as shown in FIG. 3, the five numbering devices 36 arranged in the rotation direction are provided at eleven locations in the axial direction of the numbering cylinder 31 (left and right in FIG. 3). Although not shown in the drawings, a plurality of printing portions are provided in a state of being arranged in the circumferential direction on the outer peripheral portion of each ring 41 of these numbering devices 36. The drive mechanism for the ring wheel contacts a cam member (not shown) supported by the first and second frames 37 and 38, and rotates the ring ring 41 by a fixed rotation angle every time the number drum 31 rotates. To advance the printing part by one. The printing unit is supplied with ink by making contact with the ink form roller 42 of the ink supply device 32, and transfers ink to the sheet 2 by making contact with the sheet 2 on the impression cylinder 24 side as the numbering cylinder 31 rotates. To do. The ink supply device 32 sends ink of an ink fountain (not shown) to the ink form roller 42 by a plurality of rollers 43.

The five numbering devices 36 arranged in the rotational direction of the numbering cylinder 31 are not provided in the entire rotational direction of the numbering cylinder 31. That is, the outer peripheral portion of the number cylinder 31 is composed of an effective portion 44 provided with the number device 36 and an ineffective portion 45 provided with no number device 36.
In this embodiment, the effective portion 44 corresponds to the “effective surface” in the present invention, and the ineffective portion 45 corresponds to the “ineffective surface” in the present invention.

  The eccentric bearing 39 that supports the number cylinder shaft 33 is rotatably supported by the first and second frames 37 and 38 and is connected to a number cylinder attaching / detaching device 46 (see FIG. 6). The number cylinder attaching / detaching device 46 rotates the eccentric bearing 39 with respect to the first and second frames 37 and 38. The operation of the numbering cylinder attaching / detaching device 46 is controlled by a control device 47 (see FIG. 6) described later.

  The eccentric bearing 39 rotates about the axis C <b> 1 with respect to the first and second frames 37 and 38. The number cylinder shaft 33 rotates about the axis C <b> 2 with respect to the eccentric bearing 39. The axis C1 and the axis C2 are separated by a predetermined length t. Therefore, when the eccentric bearing 39 is driven and rotated by the numbering cylinder attaching / detaching device 46, the distance between the numbering cylinder 31 and the impression cylinder 24 changes, and the numbering cylinder 31 is in the printing position shown in FIG. It moves between the retracted positions shown in By positioning the number cylinder 31 at the printing position, the ring 41 of the numbering unit 36 comes into contact with the impression cylinder 24 and the ink form roller 42 of the ink supply device 32. When the number cylinder 31 is positioned at the retracted position, the numbering unit 36 is separated from the impression cylinder 24 and the ink form roller 42. That is, the numbering cylinder 31 is configured to be movable between two positions consisting of a printing position in contact with the impression cylinder 24 and a retracted position away from the impression cylinder 24.

As shown in FIG. 5, a first power transmission path 51 and a second power transmission path 52 are connected to one end of the number cylinder shaft 33. The first power transmission path 51 connects the impression cylinder 24 and the number cylinder 31 so as to be integrally rotatable. The first power transmission path 51 can be configured by, for example, a gear transmission (not shown).
As shown in FIG. 5, the impression cylinder 24 is connected to a main power transmission path 53, and rotates when the power of the drive motor 54 is transmitted through the main power transmission path 53. The main power transmission path 53 includes the impression cylinder 16 and the first to fourth transfer cylinders 21 to 23 and 25 of the first to fourth printing units 11 to 14, the impression cylinder 24 of the number printing unit 15, and a description later. The first and second delivery cylinders 55 and 56 (see FIG. 1) of the sheet discharge section 5 to be rotated are integrally rotated by the power of the machine drive motor 54. The operation of this machine drive motor 54 is controlled by a control device 47 described later.

An encoder 57 and a first clutch 58 are provided in the middle of the first power transmission path 51. The encoder 57 detects the rotational phase of the numbering cylinder shaft 33. In this embodiment, the encoder 57 constitutes “phase detection means” in the present invention. The detection result of the encoder 57 is sent as a signal to the control device 47 described later. The position where the encoder 57 is provided is not limited to the first power transmission path 51, and can be changed as appropriate, such as the numbered cylinder shaft 33 and the second power transmission path 52.
The first clutch 58 corresponds to the “first connecting / disconnecting mechanism” in the present invention, and switches between a connected state where power is transmitted and a disconnected state where power transmission is interrupted. The operation of the first clutch 58 is switched by a control device 47 described later.

  The second power transmission path 52 includes a second clutch 61 and connects the numbering cylinder shaft 33 and the numbering cylinder driving device 62. The second clutch 61 includes a connection state in which the power of the number drum driving device 62 is transmitted to the number drum 31 via the second power transmission path 52, and power transmitted from the number drum driving device 62 to the number drum 31. Is switched to the disconnected state. The second clutch 61 constitutes a “second connecting / disconnecting mechanism” according to the present invention.

The number cylinder drive device 62 includes a number cylinder drive motor 63 and has a function of rotating the number cylinder 31 independently by the power of the number cylinder drive motor 63 in a state where the second clutch 61 transmits power. Yes. In this embodiment, the numbering cylinder driving device 62 corresponds to the “printing cylinder driving device” according to the second aspect of the present invention.
As the number drum drive motor 63, a motor equipped with a non-excitation operation type electromagnetic brake (not shown) can be used. The operation of the number drum drive motor 63 and the operation of the second clutch 61 are controlled by a control device 47 described later.

  As shown in FIG. 1, the sheet discharge unit 5 includes a sheet pile 64 on which the sheets 2 are stacked, a delivery chain type conveying device 65 that conveys the sheet 2 from the number printing unit 15 to above the sheet pile 64, and the like. Yes. The conveying device 65 includes a first delivery cylinder 55 adjacent to the impression cylinder 24 of the number printing unit 15, a second delivery cylinder 56 positioned above the sheet pile 64, and the first and second delivery cylinders 55. , 56 and a delivery chain 66 that rotates.

As shown in FIG. 6, the control device 47 includes a printing operation control unit 71 and a pause operation control unit 72, and the above-described machine drive motor 54, number cylinder drive motor 63, number cylinder attachment / detachment device 46, first The clutch 58, the second clutch 61 and the encoder 57 are connected.
The printing operation control unit 71 of the control device 47 controls the operations of the sheet supply unit 3, the printing unit 4, and the sheet discharge unit 5 when printing by the printing machine 1 is performed. When printing is performed using the number cylinder 31, the printing operation control unit 71 puts the first clutch 58 into a connected state and puts the second clutch 61 into a disconnected state.

The pause operation control unit 72 controls the operation of the number cylinder 31 when printing is performed on the sheet 2 by the first to fourth printing units 11 to 14 in a state where the number cylinder 31 is stopped without being used. When the number cylinder 31 is paused, the control device 47 performs two operations described later. These two operations are a retracting operation for moving the numbering cylinder 31 to the retracting position and a rotating operation for rotating the numbering cylinder 31 with the ineffective portion 45 of the numbering cylinder 31 facing the impression cylinder 24 as a target. . The order in which these retracting and rotating operations are performed can be changed as appropriate.
The retracting operation is performed by the control device 47 operating the numbering cylinder attaching / detaching device 46. When the numbering cylinder 31 moves to the retracted position, a gap D1 is formed between the ring 41 of the numbering device 36 and the sheet 2 held by the impression cylinder 24, as shown in FIG.

In performing the rotation operation, there are two methods: a method using the main unit drive motor 54 and a method using the numbering cylinder drive motor 63.
When the machine drive motor 54 is used, first, the control device 47 puts the second clutch 61 in the disconnected state and the first clutch 58 in the connected state, and rotates the machine drive motor 54. When the machine drive motor 54 rotates, power is transmitted from the main power transmission path 53 to the numbering cylinder 31 via the first power transmission path 51 and the first clutch 58, and the numbering cylinder 31 rotates.

  At this time, the control device 47 detects the phase of the numbering cylinder 31 using the encoder 57, and stops the machine drive motor 54 in a state where the ineffective portion 45 faces the impression cylinder 24, or the first clutch The numbering cylinder 31 is stopped with 58 being cut. Note that, when the numbering cylinder 31 is stopped, the control device 47 stops the main body drive motor 54 and then stops the first clutch 58 after the numbering cylinder 31 stops. Since the numbering cylinder 31 is heavy, even if the first clutch 58 is simply disengaged as described above, the numbering cylinder 31 is not rotated by vibration during printing and is held in a stopped position. Is done. In addition, when the thing provided with the non-excitation action | operation type electromagnetic brake is used as the numbering cylinder drive motor 63, the numbering cylinder 31 is braked by this electromagnetic brake.

  On the other hand, when the number cylinder drive motor 63 is used, first, the control device 47 puts the first clutch 58 in a disconnected state. Next, the control device 47 puts the second clutch 61 into a connected state and rotates the number drum drive motor 63. As the number cylinder drive motor 63 rotates in this way, the power of the number cylinder drive motor 63 is transmitted to the number cylinder 31 via the second power transmission path 52, and the number cylinder 31 rotates. At this time, the controller 47 detects the phase of the number cylinder 31 using the encoder 57 and stops the number cylinder drive motor 63 in a state where the ineffective portion 45 faces the impression cylinder 24. When the number cylinder drive motor 63 equipped with a non-excitation operation type electromagnetic brake is used, the number cylinder 31 is braked by the electromagnetic brake at this time.

  In this way, when the number cylinder 31 is rotated by the machine drive motor 54 or the number cylinder drive motor 63 and the ineffective portion 45 faces the impression cylinder 24, the numbering device 36 is greatly separated from the impression cylinder as shown in FIG. To do. In such a stopped state of the numbering cylinder 31, a gap D <b> 2 is formed between the ineffective portion 45 and the impression cylinder 24. This gap D2 is wider than the gap D1 shown in FIG.

  The numbering cylinder 31 in which printing is stopped in this manner is because power transmission is interrupted by the first clutch 58 even when printing is performed by the first to fourth printing units 11 to 14. , Maintain the stopped state. The gap D2 between the ineffective portion 45 and the impression cylinder 24 in the stopped state is a gap between the effective portion 44 and the impression cylinder 24 in a state where the effective portion 44 faces the impression cylinder 24 (see FIG. 4). It is wider than the gap D1. In other words, the numbering cylinder 31 where printing is suspended stops in a state where a wide space is formed between the numbering cylinder 31 and the impression cylinder 24.

  For this reason, when the sheet 2 is conveyed by the impression cylinder 24 and passes through the vicinity of the number cylinder 31 where printing is suspended, it is possible to prevent the sheet 2 from coming into contact with the number cylinder 31. Therefore, according to this embodiment, it is possible to provide a printing machine in which the number printing unit 15 which is a part of the printing units is paused and printing is performed so that the sheet 2 is not damaged or soiled. .

The printing press 1 according to this embodiment is connected to the numbering cylinder 31 via a second power transmission path 52 different from the first power transmission path 51 and has a function of rotating the numbering cylinder 31 independently. A driving device 62 is provided. Further, the printing press 1 includes a second clutch 61 that is provided in the second power transmission path 52 and switches between a state where power is transmitted and a state where power is interrupted.
According to this embodiment, the numbering cylinder 31 can be rotated independently by operating the numbering cylinder driving device 62 with the first clutch 58 disengaged and the second clutch 61 engaged. For this reason, when the ineffective portion 45 of the number cylinder 31 faces the impression cylinder 24, the control timing for stopping the machine drive motor 54 and the power of the first power transmission path 51 by the first clutch 58 are shown. It does not depend on the control timing for interrupting transmission.
Therefore, according to this embodiment, it is possible to provide a printing machine capable of easily performing the operation of putting the numbering cylinder 31 in a dormant state.

  Further, when printing by the number cylinder 31 is stopped, the second clutch 61 holds the second power transmission path 52 in a state in which power transmission is possible, so that the number cylinder driving device 62 in the stopped state. Substantially functions as a braking device for the number cylinder 31. For this reason, by adopting this configuration, it is possible to reliably prevent the numbering cylinder 31 from rotating during printing suspension. In the case where the numbering cylinder drive motor 63 is provided with a non-excitation operation type electromagnetic brake, the numbering cylinder 31 can be held at the position where it is stopped more reliably.

  Further, since the numbering cylinder 31 can be individually driven by the numbering cylinder driving device 62, the numbering cylinder 31 can be rotated to a position where it is easy to work when maintenance of the numbering unit 36 is performed, and this maintenance can be easily performed. .

(Second Embodiment)
The first embodiment described above shows an example in which the printing cylinder according to the present invention is a numbering cylinder. However, the printing cylinder according to the present invention may be a rubber cylinder used when performing sheet-fed offset printing, as shown in FIG. In FIG. 8, the same or equivalent members as those described with reference to FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

The rubber cylinder 17 shown in FIG. 8 is used in the first to fourth printing units 11 to 14 of the printing machine 1 shown in FIG. In the embodiment shown in FIG. 8, the rubber cylinder 17 corresponds to the “printing cylinder” in the present invention.
The first to fourth printing units 11 to 14 of the printing machine 1 shown in FIG. 1 have a rubber cylinder attaching / detaching apparatus that moves the rubber cylinder 17 between a printing position and a retracted position, like the number cylinder attaching / detaching apparatus 46 described above. (Not shown). In a state where the rubber cylinder 17 is positioned at the printing position, a blanket 81 provided on the rubber cylinder 17 contacts the sheet 2 on the impression cylinder 16 side. In FIG. 8, the rotation trajectory of the blanket 81 when the rubber cylinder 17 positioned at the printing position rotates is drawn by a two-dot chain line. On the other hand, in a state where the rubber cylinder 17 is positioned at the retracted position, the blanket 81 is separated from the sheet 2 on the impression cylinder 16 side.

  The blanket 81 is a sheet formed of a rubber material, and both ends are attached to the holding side vise 82 and the buttocks side vise 83 of the rubber cylinder 17 in a state of being wound around the outer periphery of the rubber cylinder 17. The mouth side vise 82 and the butt side vise 83 are provided in a notch 17 a formed in the rubber cylinder 17. The peripheral surface of the rubber cylinder 17 is constituted by an effective surface 84 constituted by a blanket 81 and an ineffective surface 85 constituted by a notch 17a. The effective surface 84 of the rubber cylinder 17 transfers the ink in contact with the sheet 2 held by the impression cylinder 16 in a state where the rubber cylinder 17 is positioned at the printing position. The non-effective surface 85 of the rubber cylinder 17 does not contact the impression cylinder 16 or the sheet 2 even when the rubber cylinder 17 is located at the printing position.

  The rubber cylinder 17 is connected to the impression cylinder 16 by a first power transmission path 51. A first clutch 58 is interposed in the first power transmission path 51. Further, the rubber cylinder 17 is connected to a rubber cylinder driving device 86 via a second power transmission path 52. A second clutch 61 is provided in the second power transmission path 52. In this embodiment, the rubber cylinder driving device 86 corresponds to the “printing cylinder driving device” according to the second aspect of the present invention.

  The first to fourth printing units 11 to 14 of the printing press 1 shown in FIG. 1 are selectively used according to the number of colors necessary for creating a printed material. For example, when printing is performed by the first to third printing units 11 to 13 without performing printing in the fourth printing unit 14, the rubber cylinder 17 of the fourth printing unit 14 is positioned at the retracted position. In this case, as shown in FIG. 8, the rubber cylinder 17 of the fourth printing unit 14 is moved to the retracted position and stopped in a state where the notch 17 a faces the impression cylinder 16.

In stopping the rubber cylinder 17 in such a position, as in the case of the first embodiment, either the method using the machine drive motor 54 or the method using the rubber cylinder drive device 86 is used. This can be done either way.
Therefore, according to this embodiment, printing is performed with some of the printing units (fourth printing unit 14) out of the plurality of printing units (first to fourth printing units 11 to 14). In this case, the sheet 2 can be reliably prevented from coming into contact with the rubber cylinder 17 of the printing unit to be stopped. Therefore, even when this embodiment is adopted, the same effect as that of the first embodiment can be obtained.

(Third embodiment)
The printing cylinder according to the present invention may be a varnish transfer cylinder for applying a coating liquid (varnish) to a sheet as shown in FIG. In FIG. 8, the same or equivalent members as those described with reference to FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.
A varnish transfer cylinder 91 shown in FIG. 9 is included in a coating unit 92 incorporated in a sheet-fed printing press as shown in FIG. In the embodiment shown in FIG. 9, the varnish transfer cylinder 91 corresponds to the “printing cylinder” in the present invention.

The coating unit 92 includes a pressure drum 93 that holds and conveys the sheet 2, a varnish transfer cylinder 91 located near the pressure drum 93, and a coating liquid supply device 94 that supplies the coating liquid to the varnish transfer cylinder 91. A varnish transfer cylinder attaching / detaching device (not shown) for moving the varnish transfer cylinder 91 relative to the impression cylinder 93 is provided.
The varnish transfer cylinder 91 has a blanket 95 that holds the coating liquid. The blanket 95 is a sheet made of a rubber material, and both ends are attached to the holding side vise 96 and the buttocks side vise 97 of the varnish transfer cylinder 91 while being wound around the outer periphery of the varnish transfer cylinder 91. ing. The mouth side vise 96 and the butt side vise 97 are provided in a notch 91 a formed in the varnish transfer cylinder 91.

The coating liquid supply device 94 includes a varnish boat 94a in which the coating liquid is stored, a varnish original roller 94b for sending the coating liquid from the varnish boat 94a to the varnish transfer cylinder 91, a metering roller 94c, a dosing roller 94d, and the like. ing.
The varnish transfer cylinder attaching / detaching device moves the varnish transfer cylinder 91 between the varnish transfer position and the retracted position in the same manner as the number cylinder attaching / detaching apparatus 46 described above. In this embodiment, the varnish transfer position corresponds to the “printing position” in the present invention.
In a state where the varnish transfer cylinder 91 is positioned at the varnish transfer position, the blanket 95 provided on the varnish transfer cylinder 91 comes into contact with the sheet 2 on the impression cylinder 93 side. In FIG. 9, the rotation trajectory of the blanket 95 when the varnish transfer cylinder 91 positioned at the varnish transfer position rotates is drawn by a two-dot chain line. On the other hand, in a state where the varnish transfer cylinder 91 is positioned at the retracted position, the blanket 95 is separated from the sheet 2 on the impression cylinder 93 side.

  The peripheral surface of the varnish transfer cylinder 91 is constituted by an effective surface 98 constituted by a blanket 95 and an ineffective surface 99 constituted by a notch 91a. The effective surface 98 of the varnish transfer cylinder 91 transfers the coating liquid in contact with the sheet 2 held by the impression cylinder 93 in a state where the varnish transfer cylinder 91 is located at the varnish transfer position. The ineffective surface 99 of the varnish transfer cylinder 91 does not contact the impression cylinder 93 or the sheet 2 even when the varnish transfer cylinder 91 is located at the varnish transfer position.

  The varnish transfer cylinder 91 is connected to the impression cylinder 93 through the first power transmission path 51. A first clutch 58 is interposed in the power transmission path. Further, the varnish transfer cylinder 91 is connected to the varnish transfer cylinder driving device 101 via the second power transmission path 52. In this embodiment, the varnish transfer cylinder driving device 101 corresponds to a “printing cylinder driving device” according to the second aspect of the invention.

In the coating unit 92 shown in FIG. 9, when the coating liquid is not transferred to the sheet 2, the varnish transfer cylinder 91 is positioned at the retracted position. In this case, as shown in FIG. 9, the varnish transfer cylinder 91 is moved to the retracted position and stopped in a state where the notch 91 a faces the impression cylinder 93. In stopping the varnish transfer cylinder 91 at such a position, as in the case of the first embodiment, a method of using the drive motor 54 and a method of using the varnish transfer cylinder drive device 101 are used. It can be performed by either one of the methods.
Therefore, according to this embodiment, it is possible to reliably prevent the sheet 2 from coming into contact with the varnish transfer cylinder 91 when the coating unit 92 is stopped and printing is performed by another printing unit. Therefore, even when this embodiment is adopted, the same effect as that of the first embodiment can be obtained.

  DESCRIPTION OF SYMBOLS 1 ... Printing machine 2 ... Sheet, 11 ... 1st printing unit, 12 ... 2nd printing unit, 13 ... 3rd printing unit, 14 ... 4th printing unit, 15 ... Number printing unit, 16, 24, 93 ... Impression cylinder (conveyance cylinder), 31 ... Number cylinder (printing cylinder), 17 ... Rubber cylinder (printing cylinder), 91 ... Varnish transfer cylinder (printing cylinder), 51 ... First power transmission path, 58 ... First Clutch (first connecting / disconnecting mechanism), 57 ... encoder (phase detection means), 47 ... control device, 17a, 91a ... notch, 44 ... effective portion, 84, 98 ... effective surface, 45 ... non-effective portion, 85, 99 ... non-effective surface, 51 ... second power transmission path, 62 ... number cylinder driving device (printing cylinder driving device), 86 ... rubber cylinder driving device (printing cylinder driving device), 101 ... varnish transfer cylinder driving device (Print cylinder driving device).

Claims (2)

Among a plurality of printing units that apply a liquid to a sheet, provided in at least one printing unit in which printing is paused, a conveyance cylinder that holds and conveys the sheet;
A printing cylinder configured to be movable between two positions consisting of a printing position in contact with the conveyance cylinder and a retreat position away from the conveyance cylinder;
A first power transmission path that rotatably connects the transport cylinder and the printing cylinder together;
A first connecting / disconnecting mechanism that is provided in the first power transmission path and switches between a state in which power is transmitted and a state in which power is interrupted;
Phase detection means for detecting the rotational phase of the printing cylinder;
A control device for controlling the operation of the first connecting / disconnecting mechanism and changing the position of the printing cylinder in the rotational direction based on the detection result of the phase detection means;
The peripheral surface of the printing cylinder is
In the state where the printing cylinder is located at the printing position, an effective surface for transferring the liquid in contact with the sheet held by the conveyance cylinder;
Including an ineffective surface that does not come into contact with the transport cylinder or the sheet even when the printing cylinder is located at the printing position,
When the printing cylinder moves to the retracted position and printing by the printing cylinder is stopped, the control device sets the first connecting / disconnecting mechanism to a state where the transmission of power is cut off, and the phase detection A printing machine having a function of setting the printing cylinder in a state where the ineffective surface faces the conveyance cylinder based on a detection result of the means. The printing press according to claim 1, wherein
further,
A printing cylinder driving device connected to the printing cylinder via a second power transmission path different from the first power transmission path and having a function of rotating the printing cylinder alone;
A printing machine comprising: a second connection / disconnection mechanism provided in the second power transmission path, for switching between a state in which power is transmitted and a state in which power is interrupted.

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