JP2022030653A - Printing apparatus - Google Patents

Abstract

To provide a printing apparatus in which it can be determined, with simple structure, whether a key groove is at a predetermined rotation position or not.SOLUTION: A printing apparatus includes: a support shaft having a key that is inserted into a key groove 51b of a plate cylinder 51; a raising/lowering unit that moves the plate cylinder 51 between a plate replacement position where the plate cylinder 51 in a printing unit performing printing on a web is attached/detached, a detection position where a position of the key groove 51b is detected and a standby position where the plate cylinder 51 carried in the printing unit is put on standby; a non-contact sensor that measures a distance of the plate cylinder 51 from the detection position; and a control unit that detects the position of the key groove 51b from a measurement result of the non-contact sensor. The non-contact sensor measures distances of the plate cylinder 51 respectively from a center portion P2 where the key groove 51b is estimated to be position at the detection position and side parts P1, P3 each of which is separated from the center portion P2 by a width Wk or more of the key groove 51b in a tangential direction of the plate cylinder 51. Based on differences from the plurality of portions measured by the non-contact sensor, the control unit detects the position of the key groove 51b.SELECTED DRAWING: Figure 9

Description

The present invention relates to a printing apparatus.

Conventionally, in a gravure printing machine that transfers ink applied to a plate cylinder to a web for printing, a printing device having a function of efficiently replacing the plate cylinder has been developed. Specifically, the key groove provided on the plate cylinder and the key provided on the support shaft supporting the plate cylinder are aligned in advance to facilitate the replacement of the plate cylinder (for example, Patent Document). 1).

Japanese Unexamined Patent Publication No. 2013-144432

In the printing apparatus according to Patent Document 1, the plate cylinder is mounted on the trolley with the index mark as a reference, and the trolley is carried into the printing unit. Then, the elevating part in the printing unit receives the plate cylinder and raises it. The elevating mechanism stops at a position in the middle of ascending, irradiates a point on the side surface of the plate cylinder with a laser of a sensor, measures a distance, and rotates the plate cylinder by a plate cylinder rotating mechanism provided in the elevating mechanism. In this way, by measuring the distance between the plate cylinder and the sensor while rotating the plate cylinder, the position of the key groove is determined from the difference in the measured distance between the key groove portion and the flat surface portion that is not the key groove, and the plate cylinder Align the keyway with the key of the support shaft.

However, in order to rotate the plate cylinder at the detection position, the elevating mechanism requires a drive unit that generates a rotational force, a roller that transmits the rotational force to the plate cylinder, a sensor that measures the amount of rotation of the plate cylinder, and the like. The structure of the elevating part becomes complicated.

The present invention has been made in view of the above circumstances, and in order to align the key groove of the plate cylinder with the key of the support shaft, it has a simple structure and whether or not the key groove is in a predetermined rotation position. It is an object of the present invention to provide a printing apparatus capable of determining whether or not.

In order to achieve the above object, the printing apparatus according to the present invention is
A support shaft with a key inserted into the keyway of the plate cylinder,
The plate exchange position in the printing unit for printing on the web, the detection position for detecting the position of the key groove, and the standby position for waiting the plate cylinder carried into the printing unit. The elevating part that moves the plate cylinder and
A non-contact sensor that measures the distance to the plate cylinder at the detection position, and
A control unit that detects the position of the keyway from the measurement result of the non-contact sensor is provided.
The non-contact sensor is
The distance to the plate cylinder is measured at the central portion where the key groove is presumed to be located at the detection position and the side portion separated from the central portion by the width of the key groove or more in the tangential direction of the plate cylinder.
The control unit
The position of the keyway is detected based on the difference in the distances of the plurality of points measured by the non-contact sensor.

In addition, the non-contact sensor is
The distance to the plate cylinder is measured at a plurality of points set on the radial straight line of the plate cylinder passing through the central portion.
The control unit
The position of the keyway is detected based on the difference between the distances of a plurality of points measured on the radial straight line.
It may be that.

In addition, the control unit
Based on the detection result of the position of the keyway,
Adjusting the plate replacement position for attaching the plate cylinder to the support shaft,
It may be that.

In addition, the printing unit is
A printing unit body having the support shaft, the elevating part, and the non-contact sensor,
A trolley unit having a first trolley on which the plate cylinder removed from the printing unit main body is mounted and a second trolley on which the plate cylinder mounted on the printing unit main body is provided.
The control unit
One of the first carriage and the second carriage is selected, and the plate cylinder is carried in and out to the standby position of the printing unit main body.
It may be that.

Further, the first carriage and the second carriage are provided with a finisher roll for supplying ink to the plate cylinder and an upper table on which the plate cylinder is placed.
The elevating unit moves the upper table delivered from the first carriage or the second carriage between the plate exchange position, the detection position, and the standby position.
It may be that.

In addition, the second trolley is
A rotation stopper that is inserted into the keyway and prevents the plate cylinder from rotating.
It may be that.

According to the printing apparatus of the present invention, the keyway is detected by using a sensor capable of measuring the distance from the sensor to the plate cylinder at a plurality of locations separated by the keyway width or more, so that the keyway can be formed with a simple structure. It is possible to determine whether or not the rotation position is predetermined.

It is a schematic diagram of the printing apparatus which concerns on embodiment. It is a front view of the printing unit which concerns on embodiment. It is a side view of the printing unit which concerns on embodiment. It is a top view of the printing unit which concerns on embodiment. It is a schematic diagram which shows the plate cylinder, the support shaft, and the elevating part at a plate exchange position. It is a cross-sectional view of a main part which shows the relationship between a plate cylinder, a support shaft and a stopper, (A) is a figure of the state which the plate cylinder is supported by the support shaft, (B) is the side surface of the plate cylinder and a stopper. The figure in the state of being in contact, (C) is the figure of the state in which the support shaft is detached from the plate cylinder. It is a schematic diagram which shows the position of the finisher arm, (A) is the figure of the state which the finisher arm is in the operating position, (B) is the figure of the state which the finisher arm is in the first attachment / detachment position, (C). ) Is a diagram showing a state in which the furniture arm is in the second attachment / detachment position. It is a schematic diagram which shows the positional relationship between a plate cylinder and a non-contact sensor. It is a side view showing the relationship between the plate cylinder and the measurement point of the non-contact sensor, (A) is a view when the plate cylinder position is appropriate, and (B) is a view when the plate cylinder is rotating. , (C) is a diagram when the plate cylinder position is low, and (D) is a diagram when the plate cylinder position is high. It is a functional block diagram which concerns on the control part of a printing unit. FIG. 2 is a cross-sectional view taken along the line AA'in FIG. It is a cross-sectional view of a main part showing the relationship between a plate cylinder and a rotation stopper, (A) is a diagram when the plate cylinder is in a standby position, (B) is a diagram at the initial stage of ascending of the plate cylinder, and (C) is a diagram. , The figure shows the state where the rotation stopper is removed from the keyway.

Hereinafter, the printing apparatus according to the embodiment of the present invention will be described with reference to the drawings.

As shown in the schematic diagram of FIG. 1, the printing apparatus 1 is a gravure printing machine that continuously prints patterns of each color on the web W. In the present embodiment, a printing machine that performs multicolor printing on the web W of paper, plastic film, etc. by gravure printing will be described as an example.

The printing device 1 winds up the unwinding roll 11 that sends out the web W, the printing unit 12 that performs gravure printing on the web W, the dryer 13 that dries the web W printed by the printing unit 12, and the web W after printing. A take-up roll 14 is provided. The printing apparatus 1 according to the present embodiment is configured such that three printing units 12 for printing different colors are arranged side by side. A plurality of guide rolls 15 are provided between the unwinding roll 11 and the winding roll 14, and the web W is wound around each guide roll 15 and printed while passing through each printing unit 12. ..

The unwinding roll 11 and the winding roll 14 are rotatably supported by a frame of a printing apparatus 1 (not shown). As the unwinding roll 11, the dryer 13, and the unwinding roll 14, each of which has a known structure can be used.

As shown in the front view of FIG. 2, the side view of FIG. 3, and the plan view of FIG. 4, the printing unit 12 rotatably supports the plate cylinder 51 and transfers ink to the web W. A bogie unit 40 for carrying in and out a replacement plate cylinder 51 with respect to the unit main body 20 is provided.

In the figure illustrating each part of the printing device 1, the left-right direction in the front view of the printing unit 12 shown in FIG. 2 is the x-axis direction, and the depth direction of the printing unit 12, that is, the vertical direction of the paper surface in FIG. 2 is the y-axis direction. A Cartesian coordinate system with the vertical direction of the print unit 12 as the z-axis direction is set and referred to as appropriate. The right direction in FIG. 2 is the + x direction, the depth direction is the + y direction, and the upward direction is the + z direction.

As shown in FIG. 2, the printing unit main body 20 includes a side frame 21, a base frame 22, a support shaft 23, a stopper 24, a control unit 25, a finisher arm 26, an elevating part 27, an ink pan 28, an elevating drive part 29, and a gear. The case 30 and the non-contact sensor 31 are provided.

The side frame 21 is a pair of frames extending in the z-axis direction. A plate cylinder 51 is rotatably supported between the side frames 21 with the axis oriented in the horizontal direction (x-axis direction).

The base frame 22 is a base arranged at the bottom of the printing unit main body 20. Both side frames 21 are connected by a base frame 22.

The support shaft 23 is arranged so as to face the inside of the side frame 21 and supports the plate cylinder 51. One of the support shafts 23 arranged to face each other can move forward and backward toward one end side in the axial direction of the plate cylinder 51 by a cylinder (not shown) that expands and contracts in a substantially horizontal direction (x-axis direction). Further, the other support shaft 23 can move forward and backward toward the other end side in the axial direction of the plate cylinder 51 by a servomotor-driven ball screw mechanism (not shown) that expands and contracts in the x-axis direction.

The plate cylinder 51 supported by the support shaft 23 is a roll for gravure printing on which a printed pattern is engraved. As shown in FIG. 5, recessed portions 51a that are tapered in a tapered shape are formed at both ends of the plate cylinder 51 in the axial direction so that the hole diameter becomes smaller toward the inside in the axial direction. A key groove 51b is formed in one of the recessed portions 51a at both ends.

The tip end side of the support shaft 23 is a substantially tapered tapered portion 23a so as to correspond to the recessed portion 51a. Further, the tapered portion 23a of one of the support shafts 23 is provided with a key 23b to be inserted into the key groove 51b of the plate cylinder 51.

Then, both support shafts 23 engage with the recessed portions 51a at both ends of the plate cylinder 51 in the advanced state to support the plate cylinder 51. Further, both support shafts 23 are separated from both concave recesses 51a of the plate cylinder 51 in a retracted state, and the plate cylinder 51 is removed from the printing unit main body 20. The plate cylinder 51 and the support shaft 23 are positioned with each other by inserting the key 23b provided on one support shaft 23 into the key groove 51b of the plate cylinder 51 (FIG. 6A).

Further, on the base end side of one of the support shafts 23, a rotation drive unit (not shown) of servomotor control for rotationally driving the support shaft 23 is provided. The rotation drive unit rotates the plate cylinder 51 by rotationally driving the support shaft 23.

The stopper 24 is projected from the side frame 21 so as to be closer to the plate cylinder 51 side than the retracted support shaft 23. As a result, when the support shaft 23 retracts, the side surface 51c of the plate cylinder 51 that is fixed to the support shaft 23 and retracts together with the support shaft 23 comes into contact with the stopper 24 (FIG. 6B). The plate cylinder 51 can be easily removed from the support shaft 23 by further retracting the support shaft 23 from the state where the side surface 51c and the stopper 24 are in contact with each other (FIG. 6 (C)).

As shown in the schematic views of FIGS. 2 and 7 (A) to 7 (C), the finisher arm 26 is located laterally (−y direction) of the plate cylinder 51 in the axial direction (x-axis direction) of the plate cylinder 51. ) On both sides, the upper end is swingably supported by each side frame 21. A pair of finisher arms 26 are arranged so as to face each other. Between the lower ends of both finisher arms 26, a finisher roll 52 whose axis is oriented in the horizontal direction (x-axis direction) is rotatably supported. More specifically, a substantially U-shaped notch is formed at the swing-side end of the furnisher arm 26. Then, with the rotation shaft of the finisher roll 52 inserted in the notch portion, the clamp portion closes the notch portion, so that the finisher arm 26 supports the finisher roll 52.

By swinging the furnisher arm 26, it can be switched to an operating position (FIG. 7A), a first attachment / detachment position (FIG. 7B), and a second attachment / detachment position (FIG. 7C). The operating position is a position where the finisher roll 52 is brought into contact with the outer peripheral surface of the plate cylinder 51. The first attachment / detachment position is a position where the finisher roll 52 is attached / detached without contact between the plate cylinder 51 and the finisher roll 52. The second attachment / detachment position is a position in which the finisher roll 52 is removed so as to avoid interfering with other members when the plate cylinder 51 is replaced. While the printing apparatus 1 is in operation, the finisher roll 52 rotates in the direction opposite to that of the plate cylinder 51 while being in contact with the outer peripheral surface of the plate cylinder 51.

An ink pan 28 is provided below the plate cylinder 51 and the finisher roll 52. The lower portion of the finisher roll 52 is immersed in the ink stored in the ink pan 28, and the ink is supplied to the plate cylinder 51 by the rotation of the plate cylinder 51 and the finisher roll 52. Further, the ink pan 28 can be pulled out toward the front side (−y direction) of the printing unit main body 20 by a slide portion (not shown). This facilitates cleaning of the ink in the ink pan 28 and prevents the plate cylinder 51 or the finisher roll 52 from interfering with the ink pan 28 when the plate cylinder 51 and the finisher roll 52 are replaced.

Further, on the side of the plate cylinder 51 opposite to the finisher roll 52, a doctor blade 53 that is in pressure contact with the outer peripheral surface of the plate cylinder 51 is disposed. The doctor blade 53 scrapes off excess ink adhering to the outer peripheral surface of the plate cylinder 51 by the rotational operation of the plate cylinder 51.

Above the plate cylinder 51, an impression cylinder 54 for crimping the web W to the plate cylinder 51 from above is provided. The impression cylinder 54 can be moved in the vertical direction (z-axis direction) by a slide mechanism (not shown).

The impression cylinder 54 sandwiches the web W with the plate cylinder 51 supported by the support shaft 23. Then, by the rotational operation of the plate cylinder 51 and the impression cylinder 54, the ink adhering to the outer peripheral surface of the plate cylinder 51 is transferred to the web W while conveying the web W.

The elevating part 27 raises and lowers the upper table 46 on which the plate cylinder 51 and the finisher roll 52 are placed inside the printing unit main body 20, and includes two racks 27a and a support plate 27b. More specifically, the rack 27a is driven by spur gears rotated by the elevating drive unit 29, and scoops up the upper table 46 of the carriage 43 in the standby position at the lower part of the printing unit main body 20. Then, the elevating portion 27 attaches the standby position, the detection position for detecting the key groove 51b position of the plate cylinder 51, and the plate cylinder 51 to the support shaft 23, and moves the upper table 46 between the plate exchange positions to be removed.

As shown in FIG. 2, the elevating drive unit 29 for driving the elevating unit 27 is arranged above the base frame 22 of one side frame 21. The elevating drive unit 29 is arranged so that the center of rotation is directed toward the center of the plate cylinder, and is operated by servomotor control. A rotation shaft 29a extending in the plate cylinder axis direction (x-axis direction) is attached to the output shaft of the elevating drive unit 29. The rotation shaft 29a rotates in conjunction with the rotation drive of the elevating drive unit 29.

A pair of vertically long substantially rectangular gear cases 30 are provided on the upper surface of the base frame 22 at predetermined intervals in the direction of the plate barrel axis, and the rotating shaft 29a penetrates one gear case 30 and extends. An end reaches the inside of the other gear case 30, and a spur gear (not shown) that rotates integrally with the rotating shaft 29a is provided inside each gear case 30.

Further, each gear case 30 is provided with a rack 27a that vertically penetrates the gear case 30, and the rack 27a and the spur gear mesh with each other in each gear case 30.

A support plate 27b is attached to the upper end of each rack 27a. The support plate 27b moves up and down by rotational drive of the elevating drive unit 29 in a state where the upper table 46 of the trolley 43 carried into the standby position is supported from below. More specifically, when the rotating shaft 29a rotates, each rack 27a moves up and down via spur gears, so that the support plate 27b moves up and down. Then, the elevating unit 27 transfers the plate cylinder 51 by transferring the upper table 46 on which the plate cylinder 51 is placed to and from the bogie 43 at the lower standby position. Further, the elevating portion 27 transfers the plate cylinder 51 to and from both side frames 21 at the upper plate exchange position.

The non-contact sensor 31 is a sensor that detects the position of the key groove 51b of the plate cylinder 51 at the detection position, and is arranged in the middle of the vertical direction of the side frame 21 on the support shaft 23 side having the key 23b.

As shown in FIG. 8, the non-contact sensor 31 irradiates the laser beam Lz from one side in the axial direction of the plate cylinder 51 toward the axial end portion of the plate cylinder 51 in the axial direction of the plate cylinder 51. The distance to the end portion, that is, the side surface 51c of the plate cylinder 51 is measured. The non-contact sensor 31 detects the key groove 51b by utilizing the fact that the measured value is different between the portion where the key groove 51b is formed and the portion where the key groove 51b is not formed at the axial end of the plate cylinder 51.

In the present embodiment, since the non-contact sensor 31 is used for detecting the keyway 51b, the printing unit 12 does not have a complicated structure as in the case where the sensor is in contact with the keyway 51b to detect the position. The structure of can be simplified.

The non-contact sensor 31 according to the present embodiment is a sensor capable of collectively measuring distances at a plurality of locations. Specifically, as shown in FIGS. 9A to 9D, the distances of three points (P1 to P3) separated by the keyway width Wk or more in the horizontal direction are measured. Further, the measurement points are set at a predetermined distance in the vertical direction from the keyway position (P4, P5). The predetermined distance may be, for example, the keyway depth Hk. Thereby, it is possible to detect whether or not the key groove 51b is in a predetermined rotation position. Further, for example, when a protective member is wound around the plate cylinder 51 in order to protect the plate cylinder 51, the height of the plate cylinder 51 at the detection position is estimated from the preset diameter of the plate cylinder 51. It can be determined that the height is different from the height to be set.

Further, when detecting the key grooves 51b of different types of plate cylinders 51, the key grooves 51b of each plate cylinder 51 can be detected only by changing the elevating position of the elevating portion 27 while fixing the non-contact sensor 31. Therefore, the position of the keyway 51b of the plate cylinder 51 of various sizes can be detected by utilizing the elevating operation of the elevating unit 27 without complicating the structure of the printing unit 12.

The control unit 25 controls the operation of the printing unit 12, and as shown in the block diagram of FIG. 10, the control unit 251, a storage unit 252 which is a non-volatile memory, a display unit 253 such as a liquid crystal panel, a touch panel, and the like. An input unit 254 such as a push button is provided. The control unit 251 is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a crystal oscillator, and the like. Further, the control unit 251 reads various operation programs and data stored in the ROM of the control unit 251 and the storage unit 252 into the RAM to operate the CPU, thereby performing each function of the control unit 251 shown in FIG. make it happen. As a result, the control unit 251 operates as the sensor control unit 251a and the calculation unit 251b.

The storage unit 252, which stores various data input from the input unit 254, is adjacent to each other in order to match the distance L between the transfer positions of the adjacent printing units 12 to the web W, the radius r of the plate cylinder 51, and the printed pattern. A reference position correction angle or the like for correcting to a regular reference position of the downstream plate cylinder 51 with respect to the upstream plate cylinder 51 of the printing unit 12 is stored in advance.

The control unit 251 controls the elevating drive unit 29 to raise the elevating unit 27 in a state where the bogie 43 on which the plate cylinder 51 is mounted is carried into the standby position at the lower part of the printing unit main body 20. As a result, the elevating part 27 receives the plate cylinder 51 from the bogie 43.

Further, the control unit 251 controls the elevating drive unit 29 to stop the elevating unit 27 on which the plate cylinder 51 is mounted at a detection position during ascending, and controls the non-contact sensor 31 to detect the position of the key groove 51b. do.

The sensor control unit 251a of the control unit 251 controls the non-contact sensor 31 to measure the distance from the side surface 51c of the plate cylinder 51 on the keyway 51b side. As described above, the non-contact sensor 31 according to the present embodiment measures the distance at a plurality of points on the side surface 51c. The calculation unit 251b detects the keyway position based on the measured distance. Thereby, it is possible to determine whether or not the rotation position of the key groove 51b is displaced, whether or not the height of the key groove 51b is a predetermined height estimated from the diameter of the plate cylinder 51, and the like. can.

Further, the control unit 251 controls the elevating drive unit 29 to raise the elevating unit 27 to the plate exchange position at the ascending end. Further, the control unit 251 controls each cylinder with the elevating unit 27 in the plate exchange position so that both support shafts 23 advance to both ends in the axial direction of the plate cylinder 51, and the key 23b is inserted into the key groove 51b. It is inserted and the plate cylinder 51 is rotatably supported by both side frames 21. After the plate cylinder 51 is supported by the support shaft 23, the control unit 251 controls the elevating drive unit 29 to lower the elevating unit 27.

Further, the control unit 251 controls the elevating drive unit 29 to raise the elevating unit 27 to the plate exchange position in a state where the plate cylinder 51 is rotatably supported by each support shaft 23, and the elevating unit 27 raises the plate. Supports the torso 51. Then, by controlling each cylinder, both support shafts 23 are retracted from both ends in the axial direction of the plate cylinder 51, and the plate cylinder 51 is removed from both side frames 21. As a result, the plate cylinder 51 is delivered from both side frames 21 to the elevating portion 27.

Further, the control unit 251 controls the elevating drive unit 29 in a state where the elevating unit 27 supports the plate cylinder 51 and the carriage 43 on which the plate cylinder 51 is not mounted is carried into the lower part of the printing unit main body 20. Then, the elevating part 27 is lowered, and the plate cylinder 51 is handed over to the carriage 43.

The bogie unit 40 is configured to be connected to the lower part of one side frame 21, and the bogie 43 on which the plate cylinder 51 is mounted on the lower part of the printing unit main body 20 from the opening 21a formed in the side frame 21. Carry in and out. As shown in FIGS. 2 to 4, the carriage unit 40 extends in the width direction (x-axis direction) of the printing unit 12, and includes a main body frame 41, a chassis 42, and a carriage 43 that are the bases of the carriage unit 40. On the trolley 43, a used plate cylinder 51 (hereinafter referred to as an old plate cylinder 51-1) and a furniture roll 52 (hereinafter referred to as an old furniture roll 52-1) removed from the printing unit main body 20 are mounted. The first trolley (hereinafter referred to as the old plate trolley 43-1), the replacement plate cylinder 51 newly attached to the printing unit main body 20 (hereinafter referred to as the new plate cylinder 51-2), and the furniture roll 52 (hereinafter referred to as the new plate cylinder 51-2). , New furniture roll 52-2) is mounted on a second trolley (hereinafter referred to as new edition trolley 43-2).

The chassis 42 is slidably arranged on the main body frame 41 in the y-axis direction orthogonal to the axial direction of the plate cylinder 51. Two trolleys 43, that is, an old version trolley 43-1 and a new version trolley 43-2, are installed on the chassis 42. The chassis 42 slides the chassis 42 in the y-axis direction so that any of the carriages 43 can be selected and carried in and out of the opening 21a of the printing unit main body 20. As a result, the bogie side rail 42a provided on the chassis 42 and the printing unit side rail 32 provided on the printing unit main body 20 are positioned so as to be continuous (FIGS. 4 and 11). Further, in order to move the carriage 43, the carriage side rack 42b provided in the chassis 42 and the printing unit side rack 33 provided in the printing unit main body 20 are in a continuous position.

As shown in FIG. 11, the old version trolley 43-1 and the new version trolley 43-2 are provided with a motor 44 and an upper table 46, respectively. The upper table 46 includes a plate cylinder receiver 46a that supports the plate cylinder 51 and a fanisher receiver 46b that supports the finisher roll 52. On the main body frame 41, the old version trolley 43-1 and the new version trolley 43-2 are arranged in parallel in the x-axis direction, which is the intrusion direction into the printing unit main body 20, as shown in FIGS. .. As described above, when the chassis 42 slides in the y-axis direction, either the old version trolley 43-1 or the new version trolley 43-2 faces the opening 21a of the printing unit main body 20 (hereinafter, carried in). It is called the output position.)

The motor 44 is a driving means for moving the carriage 43 between the carriage unit 40 and the printing unit main body 20, and is arranged at the lower part of the carriage 43. The type of the motor 44 is not particularly limited, and is, for example, an air motor. A spur gear 44a is attached to the drive shaft of the motor 44. By driving the motor 44 of the bogie 43 at the loading / unloading position, either the bogie side rack 42b or the printing unit side rack 33 meshes with the spur gear 44a, and the wheels at the bottom of the bogie 43 are the bogie side rail 42a and the printing unit side. By traveling on the rail 32, the carriage 43 is carried into the printing unit main body 20. The same applies when it is carried out.

The old version trolley 43-1 and the new version trolley 43-2 are provided with a trolley opening through which the support plate 27b of the elevating portion 27 can pass. An upper table 46 that can be attached and detached in the vertical direction (z-axis direction) is arranged on the upper surfaces of the old version trolley 43-1 and the new version trolley 43-2 so as to cover at least a part of the trolley opening. A plate body holder 46a is arranged on the upper table 46. The plate cylinder holder 46a has a slope facing the central axis parallel to the axis of the plate cylinder 51 (in the x-axis direction) to be mounted, and the plate cylinder 51 comes into contact with the slope so that the plate cylinder 51 comes into contact with the plate cylinder 51. Support 51. The plate cylinder 51 is mounted on the plate cylinder holder 46a in a rotated state so that the key groove 51b is located on the lower side by the operator.

The finisher receiver 46b has a groove having a substantially U-shaped cross section with respect to the axial direction (x-axis direction) of the finisher roll 52 on which the finisher roll 52 is mounted.

Further, as shown in FIG. 12A, the carriage 43 includes a rotation stopper 43a for rotationally positioning the plate cylinder 51. The rotation stopper 43a is arranged on the plate cylinder 51 intrusion direction (−y direction) side on the carriage 43. The rotation stopper 43a has a rotation axis in the y-axis direction orthogonal to the axis direction (x-axis direction) of the plate cylinder 51, and is rotatably arranged. The rotation stopper 43a is a substantially rectangular plate, and the vicinity of one end of the plate is attached to the rotation shaft. Further, the thickness of the rotation stop 43a is set to be slightly narrower than the width of the key groove 51b, and the gap between the rotation stop 43a and the key groove 51b is, for example, 1 mm. As a result, the rotation stopper 43a is rotated and engaged with the key groove 51b of the plate cylinder 51 mounted on the plate cylinder holder 46a so that the key groove 51b is located at the lower part of the plate cylinder 51. Rotational positioning can be performed by blocking the rotation of the plate cylinder 51.

The elevating part 27 supports the plate cylinder 51 positioned on the bogie 43 from below in that posture and raises it. Therefore, the plate cylinder 51 can be handed over from the carriage 43 to the elevating portion 27 in a state where the key groove 51b of the plate cylinder 51 is positioned in advance.

Subsequently, a method of replacing the plate cylinder 51 of the printing unit 12 of the printing apparatus 1, that is, a method of removing the used old plate cylinder 51-1 and attaching another plate cylinder 51, the new plate cylinder 51-2, will be described. In addition, the direction of replacing the used old finisher roll 52-1 with the new finisher roll 52-2 will also be described.

First, the operator mounts the new plate cylinder 51-2 and the new furniture roll 52-2 newly attached to the printing unit 12 on the new plate trolley 43-2, and the new plate cylinder 51 is located at the lower end of the keyway 51b. -Rotate -2. Subsequently, the rotation stopper 43a is rotated and inserted into the keyway 51b. As a result, the rotation of the new plate cylinder 51-2 is stopped (FIG. 12 (A)).

Normally, in the initial state before the start of plate cylinder replacement, as shown in FIG. 4, the bogie side rail 42a of the old plate bogie 43-1 is arranged at the loading / unloading position continuous with the printing unit side rail 32 of the printing unit main body 20. There is. Further, the new version trolley 43-2 is arranged at a position (hereinafter referred to as a shelter position) away from the opening 21a of the side frame 21.

When the operator inputs the stop of the printing device 1 to the control unit 25, the operation of the printing device 1 is stopped. Further, the finisher arm 26 swings from the operating position to the first attachment / detachment position. Subsequently, the operator pulls out the ink pan 28 toward the front (-y direction) to release it, and then inputs the start of replacement of the plate cylinder 51 from the input unit 254. The control unit 251 determines whether the old version dolly 43-1 is arranged at the loading / unloading position. Specifically, when the new version trolley 43-2 is in the loading / unloading position, the control unit 251 moves the chassis 42 on which the old version trolley 43-1 and the new version trolley 43-2 are mounted in the y-axis direction. Set the old version of the dolly 43-1 at the loading / unloading position. Further, when the old version trolley 43-1 is present at the loading / unloading position, the control unit 251 does not move the chassis 42 and proceeds to the next operation.

Then, the control unit 251 drives and controls the motor 44 of the old version trolley 43-1 and meshes the spur gear 44a connected to the motor 44 with the trolley side rack 42b and the printing unit side rack 33, so that the old version trolley 43 -1 is carried into the printing unit main body 20. The control unit 251 drives the elevating drive unit 29 to raise the elevating unit 27 while the old plate trolley 43-1 on which the plate cylinder 51 is not mounted is carried into the standby position at the bottom of the printing unit main body 20. ..

The support plate 27b of the elevating part 27 scoops up the upper table 46 of the old version trolley 43-1 while ascending. The control unit 251 stops the elevating unit 27 just before the finisher receiver 46b comes into contact with the old finisher roll 52-1 supported by the printing unit main body 20. The distance between the finisher receiver 46b and the old finisher roll 52-1 at this time is, for example, about 5 mm. Subsequently, the control unit 251 releases the clamp of the finisher arm 26 and hands the old finisher roll 52-1 from the printing unit main body 20 to the upper table 46.

The control unit 251 lowers the elevating unit 27 to a position where the finisher arm 26 does not interfere even if it swings to the second attachment / detachment position (hereinafter referred to as a finisher preparation position). Then, the control unit 251 swings the finisher arm 26 to the second attachment / detachment position. After that, the control unit 251 drives the elevating drive unit 29 to raise the elevating unit 27 to the plate exchange position.

Subsequently, the control unit 251 expands and contracts each cylinder to retract both support shafts 23 from both ends in the axial direction of the old plate cylinder 51-1, and removes the old plate cylinder 51-1 from both side frames 21. As a result, the old plate cylinder 51-1 is mounted on the plate cylinder holder 46a and delivered from the printing unit main body 20 to the upper table 46 on the elevating part 27.

After that, the control unit 251 drives the elevating drive unit 29 to lower the elevating unit 27, and in the middle of the descent, the elevating unit raises the upper table 46 on which the old plate cylinder 51-1 and the old furniture roll 52-1 are mounted. Hand over from 27 to the old version of the dolly 43-1.

The control unit 251 controls the motor 44 of the old plate trolley 43-1 to retract the old plate trolley 43-1 sideways (+ x direction) from the standby position of the printing unit main body 20, and causes the old plate cylinder 51-1 and the old plate. The Nissha roll 52-1 is carried out from the printing unit main body 20. Then, the control unit 251 drives the rotation drive unit to rotate the support shaft 23 so that the key 23b is located at the lower end of the support shaft 23.

Subsequently, the new plate cylinder 51-2 and the new finisher roll 52-2 are attached to the printing unit main body 20. The control unit 251 slides the chassis 42 to move the new version trolley 43-2 to the loading / unloading position. Then, the control unit 251 drives the motor 44 of the new version trolley 43-2, and the new version trolley 43-2 on which the new version body 51-2 and the new finisher roll 52-2 are mounted is passed through the opening 21a. Enter the standby position below the printing unit body 20.

After that, the control unit 251 drives the elevating drive unit 29 to raise the elevating unit 27, and scoops up the upper table 46 of the new version trolley 43-2. The control unit 251 drives the elevating drive unit 29 to further elevate the elevating unit 27, and stops the printing unit main body 20 at a detection position in the middle of the vertical direction. Then, the control unit 251 measures the distance to the new plate cylinder 51-2 by the non-contact sensor 31 and detects the position of the key groove 51b.

Further, the calculation unit 251b is determined from the detected position data of the key groove 51b, whether or not the key groove 51b is the rotation position of the lower end, and the predetermined diameter of the plate cylinder 51 in which the key groove 51b is input in advance. Determine if it is located at the height of.

In the non-contact sensor 31 according to the present embodiment, it is estimated that the key groove 51b is located when the plate cylinder 51 mounted on the upper table 46 moves to the detection position based on the diameter of the plate cylinder 51. With the position as a reference, the distance from the non-contact sensor 31 to the side surface 51c of the plate cylinder 51 is measured, and the position of the keyway 51b is detected. As the diameter of the plate cylinder 51, a value input in advance from the input unit 254 may be used. Further, for example, in the side frame 21, measurement may be performed using a sensor installed directly above the new plate cylinder 51-2 carried into the printing unit main body 20. In this case, the calculation unit 251b of the control unit 251 may estimate the diameter of the new plate cylinder 51-2 from the value obtained by measuring the distance from the sensor to the new plate cylinder 51-2.

As shown in FIG. 9A, the non-contact sensor 31 is located in the horizontal direction (y-axis direction) from the central portion P2 and the central portion P2 where the key groove 51b is presumed to be located with respect to the plate cylinder 51 at the detection position. The distance to the plate cylinder 51 is measured by the side portions P1 and P3 separated by the width Wk or more of the key groove 51b. The radial position of the central portion P2 is, for example, half the depth of the keyway 51b on the side surface 51c, as shown in FIG. In other words, the control unit 251 moves up and down based on the diameter of the plate cylinder 51, the specifications of the key groove 51b, etc. that have been input in advance so that the position of half the depth of the key groove 51b is the central portion P2. The amount of rise of the unit 27 is calculated, and the detection position is set.

Explaining the positional relationship between the side portions P1, P3 and the central portion P2 in more detail, the distance between the side portion P1 and the central portion P2 and the distance between the central portion P2 and the side portion P3 are the axial centers of the plate cylinder 51. It is a position separated from the central portion P2 by the width Wk of the key groove 51b in the tangential direction of the plate cylinder 51 on the arc passing through the central portion P2. Here, the tangential direction from the central portion P2 to the plate cylinder 51 means the tangential direction in the central portion P2 of the arc passing through the central portion P2 with the axis of the plate cylinder 51 as the center.

The distance between the side portions P1 and P3 and the central portion P2 may be at least the width Wk of the key groove 51b and at a point on the side surface 51c, and is an appropriate range in which the key groove 51b can be located by the rotation of the plate cylinder 51. You can select it with. Further, the side portions P1, P3 and the central portion P2 do not have to be arranged on an arc centered on the axis of the plate cylinder 51. For example, it may be arranged on a straight line in the horizontal direction (y-axis direction) passing through the central portion P2.

Further, it is estimated that the non-contact sensor 31 passes through the central portion P2 in addition to the side portions P1 and P3 and the central portion P2, and is on the radial straight line of the plate cylinder 51 and is the side surface 51c of the plate cylinder 51. The keyway position is detected by measuring the distance to the plate cylinder 51 at the lower center P4. The lower center P4 is set on the flat surface portion on the outer peripheral side of the plate cylinder 51 with respect to the key groove 51b. The distance between the central portion P2 and the central lower portion P4 is, for example, the depth Hk of the key groove 51b. Further, the distance to the plate cylinder 51 is measured at the central upper portion P5 on the axial center side of the plate cylinder 51 on a straight line in the radial direction of the plate cylinder 51 through the central portion P2. The distance between the central portion P2 and the central upper portion P5 is, for example, the depth Hk of the key groove 51b. Normally, the upper center P5 is detected as a point farther than an appropriate value as the keyway 51b.

In the above P1 to P5, the distance from the non-contact sensor 31 is measured, and the position of the key groove 51b is detected based on the measurement result. For example, as shown in FIG. 9A, if the distance from the non-contact sensor 31 to the side P1 and the distance to the side P3 are equal to or less than a predetermined threshold value, the side P1 and the side It is determined that the surface is the same as that of the portion P3 and neither of them is the key groove 51b. The predetermined threshold is, for example, 2.0 mm.

Further, if the difference in the distance between any of the side portions P1 and P3 and the central portion P2 is larger than a predetermined threshold value (2.0 mm), the calculation unit 251b sets a key groove at a point farther than the threshold value. It is determined that the value is 51b. Since the position of the key groove 51b is fixed to the lower end of the plate cylinder 51 mounted on the upper table 46 of the new plate trolley 43-2 by the rotation stopper 43a of the new plate trolley 43-2, the upper table 46 rises. As a result, even if the rotation stopper 43a is disengaged from the key groove 51b, the rotation position of the key groove 51b is held at the lower side (FIGS. 12B and 12C). Therefore, it is usually detected that the central portion P2 is the position of the keyway 51b.

However, when the plate cylinder 51 unexpectedly rotates during the ascent and the position of the key groove 51b is displaced, it is determined that the side portion P1 or P3 is the position of the key groove 51b (FIG. 9 (FIG. 9). B)), it may be determined that none of the measurement points P1 to P3 is the keyway 51b. In this case, the control unit 251 issues a warning sound, a warning display to the display unit 253, or the like to stop the elevating unit 27. After the elevating unit 27 is stopped, the operator confirms the error content displayed on the display unit 253, that is, the determination result of whether or not the key groove 51b is used for each measurement position by the non-contact sensor 31, and the new version. Correct the position of the keyway 51b of the body 51-2. Then, the error is canceled and the mounting operation of the new version body 51-2 is continued.

If the height of the new version body 51-2 is not the estimated position, the control unit 251 issues a warning to stop the elevating unit 27. Specifically, as shown in FIG. 9C, when the height of the new plate cylinder 51-2 is lower than the estimated position (-z direction) and the keyway 51b is located in the lower center P4. Further, as shown in FIG. 9D, it is assumed that the height of the new plate cylinder 51-2 is higher than the estimated position (+ z direction), and the key groove 51b is located in the upper center P5. In such a situation, for example, in order to protect the outer peripheral surface of the new plate cylinder 51-2, a protective member such as a sheet-shaped cushioning material is attached to the new plate cylinder 51-2 until the new plate cylinder 51-2 is attached to the printing unit main body 20. It can happen by wrapping around.

In this case, the operator confirms that the error content, that is, the height of the new plate cylinder 51-2 is different from the estimated value, inputs correction information to the input unit 254, and corrects the height of the elevating unit 27. .. As a result, the plate replacement position for attaching the new plate cylinder 51-2 to the support shaft 23 is adjusted to an appropriate height, and the key 23b for attaching the new plate cylinder 51-2 is not normally inserted into the key groove 51b. It is possible to prevent problems. Then, the worker cancels the error and continues the mounting operation of the new version body 51-2.

The height correction may be performed automatically by the control unit 251 based on the measured value by the non-contact sensor 31 instead of manually. Specifically, when it is determined that the key groove 51b is located in the central upper portion P5, the control unit 251 controls the elevating drive unit 29 to have a height corresponding to the distance between the central portion P2 and the central upper portion P5. By the way, the elevating part 27 is lowered. Then, the control unit 251 controls the non-contact sensor 31 again to detect the position of the key groove 51b of the new plate cylinder 51-2. If the keyway 51b is located in the central portion P2, the control unit 251 continuously raises the elevating portion 27 and moves the new plate cylinder 51-2 to the plate exchange position. As a result, the control unit 251 can adjust the plate replacement position for attaching the new plate cylinder 51-2 to the support shaft 23 based on the detection result of the position of the key groove 51b.

After confirming that the keyway 51b of the new plate cylinder 51-2 is in an appropriate position at the detection position, the control unit 251 further drives the elevating drive unit 29 to move the elevating unit 27 to the plate replacement position at the ascending end. Raise to. Then, the control unit 251 extends each cylinder to advance both support shafts 23 to both ends in the axial direction of the plate cylinder 51. As a result, the key 23b is inserted into the key groove 51b, and the plate cylinder 51 is rotatably supported by both side frames 21.

Then, the control unit 251 drives the elevating drive unit 29 to lower the elevating unit 27 to the finisher preparation position. The control unit 251 swings the furniture arm 26 from the second attachment / detachment position to the first attachment / detachment position. Subsequently, the control unit 251 raises the elevating unit 27, inserts the rotation shaft of the new finisher roll 52-2 into the notch portion of the finisher arm 26, and clamps the rotation shaft. Then, the control unit 251 drives the elevating drive unit 29 to lower the elevating unit 27, and completes the attachment of the new plate cylinder 51-2 and the new finisher roll 52-2 to the printing unit 12. The upper table 46 is handed over from the elevating part 27 to the new version bogie 43-2 at the standby position while the elevating part 27 is descending to the descending end.

After the elevating unit 27 is lowered to the descending end, the control unit 251 controls the motor 44 of the new plate bogie 43-2 to move the new plate bogie 43-2 from the printing unit main body 20 to the chassis 42 of the bogie unit 40. Carry out. Further, after the new version trolley 43-2 is moved to the loading / unloading position, the control unit 251 moves the chassis 42 in the + y direction. As a result, the old version trolley 43-1 on the chassis 42 is moved to a carry-in / out position where it can be carried into the printing unit main body 20 through the opening 21a.

As a result, the old plate cylinder 51-1 and the old finisher roll 52-1 attached to the printing unit main body 20 are removed, and the new plate cylinder 51-2 and the new finisher roll 52-2 are attached to the printing unit main body 20. Will be printed.

As described above, in the printing apparatus 1 according to the present embodiment, at the detection position in the middle of raising the plate cylinder 51 attached to the printing unit main body 20, up to a plurality of locations separated by a keyway width Wk or more. The keyway 51b is detected using a sensor capable of measuring the distance. Therefore, it is possible to determine whether or not the keyway 51b is at a predetermined rotation position at the detection position without rotating the plate cylinder 51. Therefore, the printing apparatus 1 having a simple structure can detect the key groove 51b and align the key groove 51b with the key 23b, so that the plate cylinder 51 can be replaced efficiently.

Further, in the printing apparatus 1 according to the present embodiment, the key groove 51b is detected by measuring the distance to the plate cylinder 51 at a plurality of radial points passing through the key groove 51b and the axial center of the plate cylinder 51. Is to be done. As a result, the keyway position can be detected even when the protective member is wound around the plate cylinder 51. Further, since the plate exchange position can be adjusted based on the detected height of the key groove 51b, the plate cylinder exchange can be performed more efficiently.

Further, the elevating part 27 according to the present embodiment does not have a plate cylinder rotation mechanism. Therefore, unlike the conventional printing device, a plate body holder with a rotation mechanism having a narrower width (direction of the plate body axis), that is, a width narrower than the trolley opening, is raised and lowered separately from the plate body support on the trolley side. It does not have to be provided on the 27 side. Therefore, at the plate replacement position, the removed plate cylinder 51 can be supported by a plate cylinder holder having a wider width. As a result, in order to position the plate cylinder 51 to be removed on the plate cylinder holder 46a, it is not necessary to provide a plate cylinder position regulating mechanism such as a movable support shaft cover. Therefore, the structure of the apparatus can be simplified and the plate cylinder 51 can be delivered more stably.

In the present embodiment, the key groove 51b is set to be located at the lower end of the plate cylinder 51, but the present invention is not limited to this. For example, the keyway 51b may be located on the side of the plate cylinder 51.

In the present embodiment, the carriage 43 in which the plate cylinder 51 is carried into the printing unit main body 20 and the plate cylinder 51 attached to both side frames 21 of each printing unit 12 are positioned vertically. Therefore, since the depth (length in the y-axis direction) of each printing unit 12 intersecting the axial direction of the plate cylinder 51 is narrowed, the distance between the printing units 12 can be narrowed, and printing of a compact layout can be performed. It can be the device 1.

Further, according to the printing apparatus according to the present embodiment, since the carriage 43 is carried in and out from the side with respect to the standby position of the printing unit 12, the spaces on the upstream side and the downstream side in the web transport direction of the printing unit 12 are effective. Available.

The present invention is suitable for a printing device having a plate cylinder supported rotatably, in which plate cylinders having different diameters are appropriately replaced for printing. In particular, it is suitable for attaching to the printing unit with a protective member for protecting the plate cylinder attached.

1 printing device, 11 unwinding roll, 12 printing unit, 13 dryer, 14 take-up roll, 15 guide roll, 20 printing unit body, 21 side frame, 21a opening, 22 base frame, 23 support shaft, 23a taper part , 23b key, 24 stopper, 25 control unit, 251 control unit, 251a sensor control unit, 251b calculation unit, 252 storage unit, 253 display unit, 254 input unit, 26 furniture arm, 27 elevating unit, 27a rack, 27b support Plate, 28 ink pan, 29 lift drive unit, 29a rotary shaft, 30 gear case, 31 non-contact sensor, 32 printing unit side rail, 33 printing unit side rack, 40 trolley unit, 41 main body frame, 42 chassis, 42a trolley side rail , 42b trolley side rack, 43 trolley, 43-1 old version trolley, 43-2 new version trolley, 43a rotation stop, 44 motor, 44a spur gear, 46 upper table, 46a version body holder, 46b furniture receiver, 51 version body, 51 -1 Old edition cylinder, 51-2 New edition cylinder, 51a recess, 51b keyway, 51c side surface, 52 finisher roll, 52-1 Old finisher roll, 52-2 New finisher roll, 53 Doctor blade, 54 impression cylinder , W web

Claims (6)

A support shaft with a key inserted into the keyway of the plate cylinder,
The plate exchange position in the printing unit for printing on the web, the detection position for detecting the position of the key groove, and the standby position for waiting the plate cylinder carried into the printing unit. The elevating part that moves the plate cylinder and
A non-contact sensor that measures the distance to the plate cylinder at the detection position, and
A control unit that detects the position of the keyway from the measurement result of the non-contact sensor is provided.
The non-contact sensor is
The distance to the plate cylinder is measured at the central portion where the key groove is presumed to be located at the detection position and the side portion separated from the central portion by the width of the key groove or more in the tangential direction of the plate cylinder.
The control unit
The position of the keyway is detected based on the difference in the distances of the plurality of points measured by the non-contact sensor.
A printing device characterized by that. The non-contact sensor is
The distance to the plate cylinder is measured at a plurality of points set on the radial straight line of the plate cylinder passing through the central portion.
The control unit
The position of the keyway is detected based on the difference between the distances of a plurality of points measured on the radial straight line.
The printing apparatus according to claim 1. The control unit
Based on the detection result of the position of the keyway,
Adjusting the plate replacement position for attaching the plate cylinder to the support shaft,
The printing apparatus according to claim 2. The printing unit is
A printing unit body having the support shaft, the elevating part, and the non-contact sensor,
A trolley unit having a first trolley on which the plate cylinder removed from the printing unit main body is mounted and a second trolley on which the plate cylinder mounted on the printing unit main body is provided.
The control unit
One of the first carriage and the second carriage is selected, and the plate cylinder is carried in and out to the standby position of the printing unit main body.
The printing apparatus according to any one of claims 1 to 3. The first carriage and the second carriage are provided with a finisher roll for supplying ink to the plate cylinder and an upper table on which the plate cylinder is placed.
The elevating unit moves the upper table delivered from the first carriage or the second carriage between the plate exchange position, the detection position, and the standby position.
The printing apparatus according to claim 4. The second trolley is
A rotation stopper that is inserted into the keyway and prevents the plate cylinder from rotating.
The printing apparatus according to claim 4 or 5.

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