JP7122158B2 - Printer - Google Patents

Description

The present invention relates to printing presses.

Such a printing press includes a plate cylinder and an impression cylinder which are arranged with their peripheral surfaces spaced apart from each other, and a blanket cylinder (also called a blanket cylinder) which is arranged between these cylinders. The blanket cylinder is pressed between a throw-in position where the blanket cylinder is pressed against the impression cylinder through the sheets conveyed by the impression cylinder and a throw-out position where the blanket cylinder is separated from the plate cylinder and the impression cylinder. It is being moved.

At the time of printing, by moving the blanket cylinder from the blanket cylinder to the blanket cylinder, the ink on the plate cylinder is transferred via the blanket cylinder to the sheet conveyed by the impression cylinder for printing. Also, when printing is finished (or before printing is started) or when printing is interrupted, the blanket cylinder is moved from the throw-in position to the throw-out position. By moving the plate to this release position, it is possible to replace with a new plate or clean the blanket cylinder (for example, Patent Document 1).

JP 2008-183875 A

By the way, the trunk release position is set at a position where the blanket cylinder is slightly separated from the plate cylinder and the impression cylinder. Therefore, when the blanket cylinder is moved to the unplugged position to replace the plate, if a rigid plate is wrapped around the plate cylinder, the plate may rise from the surface of the plate cylinder and interfere with the blanket cylinder. and there was room for improvement.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and an object of the present invention is to provide a printing press that allows safe plate replacement.

In order to achieve the above object, the printing press according to the present invention comprises a plate cylinder and an impression cylinder which are arranged with their peripheral surfaces separated from each other, a blanket cylinder which is arranged between these cylinders, and the blanket cylinder. A throw-in position where the blanket cylinder is brought into pressure contact with the plate cylinder and the blanket cylinder is brought into pressure contact with the impression cylinder through the sheets conveyed by the impression cylinder, and a throw-out position where the blanket cylinder is separated from the plate cylinder and the impression cylinder. and a blanket cylinder driving means for moving the blanket cylinder to at least a retracted position further away from the plate cylinder than the blanking position.

According to the above configuration, when the blanket cylinder is set to the unplugged position by the blanket cylinder driving means and, for example, printing is interrupted (in a standby state), the blanket cylinder is immediately moved from the unplugged position to the thrown-on position. Printing can be resumed. When it is desired to replace the plate, the blanket cylinder driving means moves the blanket cylinder to a retracted position where the blanket cylinder is further separated from at least the plate cylinder than the disengagement position. Since it is large, it is possible to prevent the plate from interfering with the blanket cylinder even if the plate rises from the surface of the plate cylinder when the plate is replaced.

Further, the printing press according to the present invention includes a rotation link including a rotation portion having a rotation center, an eccentric bearing that rotatably supports the blanket cylinder, and a connection portion that connects the rotation portion, The blanket cylinder is moved from the throw-in position to the throw-out position and the retracted position by transmitting the rotation about the center of rotation of the rotating portion to the eccentric bearing via the rotating link. It may be configured to allow

As described above, the blanket cylinder can be moved from the throw-in position to the throw-out position and the retracted position only by transmitting the rotation of the rotating portion to the eccentric bearing via the rotation link. It is possible to simplify the configuration for

Further, in the printing press according to the present invention, when the blanket cylinder moves from the disengagement position to the retracted position, the blanket cylinder moves away from the plate cylinder and the impression cylinder and toward the impression cylinder. It may be configured to move while drawing an inclined trajectory.

As described above, when the blanket cylinder moves from the release position to the retracted position, the blanket cylinder moves away from the plate cylinder and the impression cylinder while drawing a trajectory inclined toward the impression cylinder. It is possible to prevent the plate from interfering with the blanket cylinder at the time of plate replacement while moving the cylinder efficiently.

Further, in the printing press according to the present invention, the retracted position may be a position for performing plate exchange, blanket cylinder cleaning, or both.

According to the present invention, it is possible to provide a printing press in which plates can be changed safely by moving the blanket cylinder to the retracted position where the blanket cylinder is further separated from at least the plate cylinder than the release position.

FIG. 4 is a side view of the essential parts of the printing press with the blanket cylinder in the throw-in position; FIG. 4 is a side view of the essential parts of the printing press with the blanket cylinder in the unthrown position; FIG. 4 is a side view of the essential parts of the printing press with the blanket cylinder in the retracted position; (a) is an enlarged view of the essential part of FIG. 1, (b) is an enlarged view of the essential part of FIG. 2, and (c) is an enlarged view of the essential part of FIG. FIG. 4 is a diagram showing three movement trajectories of blanket cylinders; FIG. 6 is an enlarged view of the portion surrounded by the VI line in FIG. 5; FIG. 10 is a side view of the main part of the printing press showing another configuration for moving the blanket cylinder;

Principal parts of the printing press of the present invention will be described below with reference to the drawings.

FIG. 1 shows a plate cylinder 1 and an impression cylinder 2 which are arranged vertically with their peripheral surfaces separated from each other, a blanket cylinder (also called a blanket cylinder) 3 which is arranged between these two cylinders, and a blanket cylinder 3. to three positions of a throw-in position, a throw-out position, and a retracted position. In FIG. 1, an ink supply mechanism for supplying ink to the plate cylinder 1 is omitted, and only one printing unit for printing on sheets (not shown) is shown. A plate (not shown) on which an image is formed is wound around the plate cylinder 1, and a new plate is replaced at the retracted position of the blanket cylinder 3. The plate cylinder 1 and the blanket cylinder 3 have substantially the same diameter, and the impression cylinder 2 has a diameter substantially twice the diameter of the plate cylinder 1, but the dimensions are not limited to these.

The blanket cylinder 3 is rotatably supported via eccentric bearings 5 by a pair of frames (not shown) disposed on both left and right sides of the printing press. A connecting portion 18, which will be described later, is connected to a projecting piece 5A projecting from one position on the outer peripheral portion of the eccentric bearing 5. By pushing and pulling this connecting portion 18 by driving the blanket cylinder drive means 4, the blanket cylinder is 3 can be moved to three positions: a throw-in position, a throw-out position, and a retracted position. The movement of the blanket cylinder 3 from the throw-in position to the retracted position is performed in the order of the throw-in position→the throw-out position→the retracted position. The order is from the body-out position to the body-in position.

As shown in FIGS. 1 and 4A, the blanket cylinder 3 is pressed against the plate cylinder 1, and the blanket cylinder 3 is conveyed by the impression cylinder 2 (not shown). It is a position where the impression cylinder 2 is brought into pressure contact with the through. Here, the blanket cylinder 3 is configured so that it is pressed against the impression cylinder 2 after being pressed against the plate cylinder 1, but it may be configured to press against the plate cylinder 1 and the impression cylinder 2 at the same time. .

The throw-off position is a position where the blanket cylinder 3 is separated from the plate cylinder 1 and the impression cylinder 2, as shown in FIGS. 2 and 4(b). This throw-off position is positioned when printing is interrupted (during standby) or before printing is started, and is set to a slightly distant position so that it can be quickly moved from the throw-off position to the throw-on position when printing is resumed or started. It is

As shown in FIGS. 3 and 4(c), the retracted position is a position in which the blanket cylinder 3 is further spaced from the plate cylinder 1 than at the unthrown position. At this retracted position, the blanket cylinder 3 is moved so that the separation distance from the plate cylinder 1 is longer than the distance from the impression cylinder 2 in order to more reliably prevent contact with the plate during plate replacement. Here, the separation distance from the plate cylinder 1 to the blanket cylinder 3 is greater than the separation distance G1 from the plate cylinder 1 to the blanket cylinder 3 at the release position (see FIG. 4(b)). ), the distance G3 from the plate cylinder 1 to the blanket cylinder 3 is longer than the distance G3 from the impression cylinder 2 to the blanket cylinder 3. A distance G4 between the impression cylinder 2 and the blanket cylinder 3 at the retracted position (see FIG. 4(c)) is shorter than a distance G2 between the cylinder 2 and the blanket cylinder 3.

5 and 6 show the locus of movement of the blanket cylinder 3 when it is moved to the above three positions. In particular, the portion (the portion surrounded by line VI in FIG. 5) which is difficult to understand in FIG. 5, that is, the locus of movement of the center of blanket cylinder 3 is shown in the enlarged view of FIG. 6 from the rotation center 3A at the throw-in position (see the solid line in FIG. 5) to the rotation center 3B at the throw-out position (see the one-dot chain line in FIG. 5), the plate cylinder moves in a substantially horizontal direction. 1 and the impression cylinder 2, and from the rotation center 3B at the release position to the rotation center 3C at the retracted position (see the two-dot chain line in FIG. 5), the blanket cylinder 3 moves away from the plate cylinder 1 and impression cylinder 2. In addition, it moves while drawing a trajectory that is inclined toward the impression cylinder 2 (in FIG. 6, an arc trajectory downward in the away direction). Therefore, the blanket cylinder 3 can be moved farther away from the plate cylinder 1 without greatly changing the distance from the impression cylinder 2, and the blanket cylinder 3 can be moved efficiently, while the plate is replaced. can be prevented from interfering with the blanket cylinder 3. In FIGS. 5 and 6, a downward sloping straight line L1 indicated by a one-dot chain line extends from the rotation center 1A of the plate cylinder 1 to the nip point N1, which is the contact point between the plate cylinder 1 and the blanket cylinder 3, and the blanket cylinder 3. This is the line connecting the center of rotation 3A at the put position. A straight line L2 with an upward slant to the right indicated by a one-dot chain line extends from the center (not shown) of the impression cylinder 2 to the nip point N2, which is the contact point between the impression cylinder 2 and the blanket cylinder 3, and the throw-in position of the blanket cylinder 3. is a line connecting the rotation centers 3A at . 5B in FIG. 6 is the fulcrum of the eccentric bearing 5. As shown in FIG.

The blanket cylinder driving means 4 includes a first driving means 6 for moving the blanket cylinder 3 between the throw-in position and the throw-out position in synchronization with the rotation of the impression cylinder 2, and a blanket cylinder 3 retracting to the throw-in position and the throw-out position. A second driving means 7 constituting a retracting driving means separate from the first driving means 6 for moving between positions is provided.

As shown in FIG. 1, the first driving means 6 includes two cams 8 and 9 with different shapes which are superimposed in two stages so as to rotate coaxially with the impression cylinder 2, and springs attached to the cams 8 and 9. Two cam followers 11 and 12 which are urged into contact with each other by means (not shown) or the like and which are swingably attached with a shaft 10 as a fulcrum, and a substantially crescent-shaped cam follower attached in the vicinity of the cam followers 11 and 12. a claw 13, a lever 14 having one end (base end) connected to the center of the claw 13 and rotatable about a shaft 10 as a fulcrum, an arm 15 connected to the other end (tip) of the lever 14, and the arm 15. A rotating link 16 to which an end portion opposite to the lever 14 side is connected is provided. FIG. 1 shows the rotation center 3A of the blanket cylinder 3 and the fulcrum 5B of the eccentric bearing 5. As shown in FIG.

An air cylinder 17 as an actuator is connected to the pawl 13, and the air cylinder 17 is extended and contracted so that the pawl 13 contacts the contact portion 11a of one of the cam followers 11 and 12 (only one cam follower 11 is shown). drive. The arm 15 includes a first arm 15A connected to the rotary link 16 and a second arm 15B having one end connected to the lever 14 and the other end rotatably connected to the first arm 15A. By driving the second driving means 7, the first arm 15A and the second arm 15B are rotated relative to each other at the rotary connecting portion 15C, so that the arm 15 is formed into a substantially dogleg shape at the rotary connecting portion 15C. It is configured so that it can be folded (broken in the middle). As a result, the rotary connecting portion 15C moves downward, and the first arm 15A rotates the rotating portion 19, which will be described later, counterclockwise. The rotating link 16 has a connecting portion 18 that is pivotally connected to the projecting piece 5A of the eccentric bearing 5 of the blanket cylinder 3, and a rotating portion 19 that has a pivoting center portion 19A in which the base end portion of the connecting portion 18 is pivotally connected. and Therefore, by transmitting the rotation about the rotation center 19A of the rotation link 16 to the blanket cylinder 3 through the connecting portion 18, the blanket cylinder 3 is moved from the throw-in position to the throw-out position and the retracted position. Let A stopper portion 20 that abuts when the lever 14 is rotated to one side to limit the rotation angle of the lever 14 to one side, and a stopper portion 20 that abuts to the other side of the lever 14 when the lever 14 is rotated to the other side. A stopper portion 21 is provided to limit the angle of rotation to.

The second driving means 7 includes a guide member 23 whose base end is attached to a substantially L-shaped fixed member 22 so as to be rotatable about a horizontal axis Y, and a guide member 23 whose base end is rotatable around a horizontal axis Y, and a guide member 23 whose base end is rotatable around a horizontal axis Y, and a lower end of the guide member 23 and a lower end of the fixed member 22. It has an extendable air cylinder 24 as an actuator attached to the right end. The expansion and contraction of the air cylinder 24 allows the guide member 23 to be changed between the inclined posture shown in FIGS. 1 and 2 and the horizontal posture shown in FIG. By changing the posture of the guide member 23 from the inclined posture to the horizontal posture, the arm 15 can be folded (broken) at the rotary connecting portion 15C as described above.

The guide member 23 is formed with a linear elongated hole 23A for guiding the movement of the rotary connecting portion 15C of the arm 15 when the blanket cylinder 3 is moved between the throw-in position and the throw-out position. By moving the rotary connecting portion 15C through the elongated hole 23A, the arm 15 can move linearly without breaking at the rotary connecting portion 15C. Also, in the guide member 23, when the blanket cylinder 3 is at the retracted position shown in FIG. A restricting mechanism 25 is provided for restricting the operation. The regulating mechanism 25 includes a regulating member 26 that is attached to the guide member 23 so as to be swingable around the horizontal axis Z and that abuts against the rotary connecting portion 15C to regulate the position of the rotary connecting portion 15C. A coil spring 27 is provided as a biasing means for biasing the connecting portion 15C so as to abut on the connecting portion 15C.

FIG. 1 shows a state in which the blanket cylinder 3 has moved to the throw-in position. In this case, the cam follower 11 is pushed by the cam 9 and swung clockwise to push the pawl 13 . As a result, the lever 14 is rotated clockwise, and the arm 15 is moved obliquely upward to the right. As the arm 15 moves upward, the rotating portion 19 rotates clockwise, and the connecting portion 18 is pushed upward to the left, causing the eccentric bearing 5 to rotate counterclockwise about the fulcrum 5B. presses (contacts) the plate cylinder 1 and presses (contacts) the impression cylinder 2 via a sheet (not shown). By the lever 14 coming into contact with one of the stopper portions 20, the rotation width of the blanket cylinder 3 is accurately restricted, and the blanket cylinder 3 can be accurately positioned at the throw-in position. FIG. 1 shows the rotation center 3A of the blanket cylinder 3 and the fulcrum 5B of the eccentric bearing 5. As shown in FIG.

FIG. 2 shows a state in which the blanket cylinder 3 has moved to the unwinding position. In this case, the cam follower 12 is pushed by the cam 8 and swung counterclockwise to push the pawl 13 . As a result, the lever 14 is rotated counterclockwise, and the arm 15 is moved obliquely downward to the left. The movement of the arm 15 rotates the rotation link 16 counterclockwise, pulls the connecting portion 18 obliquely downward to the right, rotates the eccentric bearing 5 clockwise, and the blanket cylinder 3 moves the plate cylinder 1 and the pressure away from the torso 2; Also in this case, the lever 14 abuts on the other stopper portion 21, so that the range of rotation of the blanket cylinder 3 is accurately restricted, and the blanket cylinder 3 can be accurately positioned at the throw-off position. FIG. 1 shows the center of rotation 3B of the moved blanket cylinder 3 and the fulcrum 5B of the eccentric bearing 5. As shown in FIG.

FIG. 3 shows a state in which the blanket cylinder 3 has moved to the retracted position. In this case, when the blanket cylinder 3 is at the unthrown position of FIG. 2, the guide member 23 is changed from the inclined posture to the horizontal posture by shortening the air cylinder 24 in the extended state, and the arm 15 is moved to the rotary connecting portion 15C. It can be folded (broken in the middle). As a result, the rotary link 16 is further rotated counterclockwise, the connecting portion 18 is pulled obliquely downward to the right, and the eccentric bearing 5 is further rotated clockwise. Separate. Since the rotary connecting portion 15C is in contact with the restricting member 26, the rotary connecting portion 15C is restricted from moving to the right side of the elongated hole 23A, and the eccentric bearing 5 is rotated counterclockwise to rotate the body. Movement to the extraction position side is restricted.

As described above, by setting the blanket cylinder 3 to the retracted position, the plate can be replaced safely. Therefore, for example, the blanket cylinder 3 can be rotated at high speed to clean the blanket cylinder 3 while the plate is being replaced. . Therefore, since the plate replacement work and the cleaning work of the blanket cylinder 3 can be performed at the same time, it is possible to shorten the preparation time before starting a new print, for example.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

In the above embodiment, the cams 8 and 9 are used to move the blanket cylinder 3 to the throw-in position and the throw-out position, and the air cylinder (hydraulic cylinder or telescopic type) constituting the second driving means 7 moves from the throw-in position to the retracted position. 24, which may be an actuator such as an electric motor, but as shown in FIG. 33 may be used to move the blanket cylinder 3 to the throw-in position (see the solid line), the throw-out position (see the one-dot chain line), and the retracted position (see the two-dot chain line). Pipes 34 and 35 for sucking and discharging air are provided at both ends in the axial direction of each working chamber 33A. One end of a hose 36 is connected to the pipes 34 and 35, the other end of the hose 36 is connected to a valve (not shown), and an air supply device (not shown) is connected to the valve. Specifically, the tip of the rod 33R of the three-stage air cylinder 33, which is pivoted at the base end, is connected to the rotating portion 19 of the rotating link 16, and the connecting portion 18 of the rotating link 16 is eccentrically connected. It is connected to the projecting piece 5A of the bearing 5. As shown in FIG. Therefore, in FIG. 7, as indicated by the solid line, the rod 33R of the three-stage air cylinder 33 is extended to the maximum four stages to position the blanket cylinder 3 at the throw-in position. Also, the rod 33R of the three-stage air cylinder 33 is shortened by one step from the maximum extension to separate the impression cylinder 2 and the blanket cylinder 3, and further shortened by one step to position the blanket cylinder 3 at the blanking position. can be done (see one-dot chain line). Also, the rod 33R of the three-stage air cylinder 33 can be shortened from the maximum extension to the minimum extension to position the blanket cylinder 3 at the retracted position (see two-dot chain line). A telescopic electric motor may be used instead of the three-stage air cylinder 33 . In this case, the three extension/retraction positions of the electric motor are detected by a detection means (for example, a non-contact sensor), and drive control is performed by the control unit so that the tip of the rod 33R is accurately positioned based on the detection information of the detection means. it becomes necessary to

In the above embodiment, the blanket cylinder 3 is moved so that the distance between the blanket cylinder 3 and the plate cylinder 1 is longer than the distance between the blanket cylinder 3 and the impression cylinder 2 at the retracted position. The blanket cylinder 3 is moved so that the distance between the blanket cylinder 3 and the plate cylinder 1 is shorter than the distance between the blanket cylinder 3 and the impression cylinder 2, if the blanket cylinder 3 can be moved to a position where the blanket cylinder 3 can be separated from the other position. Alternatively, the blanket cylinder 3 may be moved so that all distances are the same.

Further, in the above-described embodiment, when the blanket cylinder 3 moves from the unplugged position to the retracted position, the blanket cylinder 3 moves while drawing a downward circular arc locus in the direction away from the plate cylinder 1 and the impression cylinder 2. The blanket cylinder 3 may be configured to move linearly in the horizontal direction or linearly move obliquely downward.

In the above-described embodiment, the blanket cylinder 3 is further spaced from the plate cylinder 1 than the disengaged position. may be further separated from each other. Further, as a reference example, the blanket cylinder 3 may be further spaced from the impression cylinder 2 than the unthrown position.

DESCRIPTION OF SYMBOLS 1... Plate cylinder 1A... Rotation center 2... Impression cylinder 3... Rubber cylinder 3A, 3B, 3C... Rotation center 4... Rubber cylinder driving means 5... Eccentric bearing 5A... Protruding piece 5B... Fulcrum, 6 First driving means 7 Second driving means 8, 9 Cam 10 Shaft 11, 12 Cam follower 11a Abutting portion 13 Claw 14 Lever 15 Arm 15A First arm 15B...Second arm 15C...Rotating connecting part 16...Rotating link 17...Air cylinder 18...Connecting part 19...Rotating part 19A...Rotating center part 20, 21... Stopper portion 22 Fixed member 23 Guide member 23A Long hole 24 Air cylinder 25 Regulating mechanism 26 Regulating member 27 Coil spring 33 Air cylinder 33A, 33B, 33C Operation Chamber, 33R... Rod, 34, 35... Pipe, 36... Hose, G1, G2, G3, G4... Separation distance, L1, L2... Inclined straight line, N1, N2... Nip point, Y... Horizontal axis, Z... Horizontal axis

Claims (4)

a plate cylinder and an impression cylinder arranged with their peripheral surfaces spaced apart from each other; a blanket cylinder arranged between these cylinders; A throw-in position in which the sheet conveyed by the cylinder is pressed against the impression cylinder, a throw-out position in which the sheet is separated from the plate cylinder and the impression cylinder, and a blanket cylinder at least relative to the plate cylinder. A retracted position further spaced from the removed position, and a blanket cylinder drive means for moving to the retracted position ,
A rotating link having a rotating portion having a rotating center portion, an eccentric bearing for rotatably supporting the blanket cylinder, and a connecting portion for connecting the rotating portion, wherein the rotating portion has a rotating center portion a configuration in which the blanket cylinder is moved from the throw-in position to the throw-out position and the retracted position by transmitting rotation around the center to the eccentric bearing through the rotation link;
The blanket cylinder driving means includes an arm that moves to rotate the rotating portion around the rotation center,
The arm includes a first arm connected to the rotating portion, and a second arm rotatably connected to an end of the first arm opposite to the rotating portion by a rotating connecting portion. cage,
The first arm and the second arm are arranged in a straight line when the blanket cylinder drive means moves the blanket cylinder to the undrawing position, and when the blanket cylinder is moved to the retracted position, A printing machine according to claim 1, wherein said first arm and said second arm are bent in a substantially V-shape by turning at said turning connecting portion . The blanket cylinder drive means includes first drive means for moving the arm between the throw-in position and the throw-out position in synchronization with the rotation of the impression cylinder, and the first drive means. and a second drive means that constitutes a separate evacuation drive means, and the first arm and the second arm are rotated at the rotary connection portion by the drive of the second drive means. 2. A printing press according to claim 1 , wherein said blanket cylinder is moved to said retracted position by bending in said substantially doglegged shape . When the blanket cylinder moves from the retracted position to the retracted position, the blanket cylinder moves in a direction away from the plate cylinder and the impression cylinder while drawing a trajectory inclined toward the impression cylinder. 3. A printing machine according to claim 1 or 2. 4. The printing press according to any one of claims 1 to 3, wherein the retracted position is a position for performing plate replacement, blanket cylinder cleaning, or both.

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