JP6310666B2 - Can printing device - Google Patents

Description

  The present invention relates to a can printing apparatus, and more particularly to a can printing apparatus provided with a can inspection machine for inspecting a printing state.

  As a printing machine for a can, a can supply means for supplying a can, a plurality of ink supply means for supplying ink for each color, and an ink supplied from the ink supply means provided corresponding to each ink supply means It is known to include a plurality of plate cylinders to be coated and a blanket for transferring ink to a can supplied from the can body supply means after ink is transferred sequentially from each plate cylinder (Patent Document) 1).

  Further, as a can inspection machine for inspecting the printing state of a can, Patent Document 2 discloses a rotating device that rotates a can, an image capturing device that captures an image of the rotating can, and an image processing device that processes the captured image. Are provided. According to the technique disclosed in Patent Document 2, the image processing apparatus has an image inspection unit that inspects whether the image is correctly printed as compared with the master image. It has been inspected.

JP 2001-129968 A Japanese Patent Laid-Open No. 5-126762

  The conventional can printing machine and can inspection machine are used as independent devices, and the inspection results obtained by the can inspection machine are not reflected in the control of the printing press. In addition, in the inspection by the can inspection machine, it is possible to inspect whether the appearance is good or defective, but the printing misalignment value necessary for improving the printing accuracy of the printing press has not been inspected. Therefore, regarding printing misalignment, if a defective product is found by visual inspection, countermeasures will be taken in the order that the operator performs registration in the printing press, and the response to the printing misalignment will be delayed, resulting in a defective product. There was a problem of increasing.

  An object of the present invention is to provide a can printing apparatus that can solve the above problems and prevent the occurrence of defective printing misalignment.

A can printing apparatus according to the present invention is a can printing apparatus that includes a printing machine that has a plurality of plate cylinders for printing different colors and that performs printing on a can, and a can inspection machine that performs inspection of a printing state. The can inspection machine includes a can rotating device for rotating the can, a can photographing device for photographing an image of the can, and an image processing device for processing the photographed image, and the image processing device is printed on the can. Printing misregistration value measuring means for measuring the misregistration value with respect to the set position of the misregistration mark for printing misalignment, and the printing machine registers the plate cylinder based on the printing misalignment value measured by the can inspection machine. It has an automatic registration device, and each plate cylinder of the printing press is supposed to print an inspection mark used for detecting a printing misalignment value of each plate cylinder at an end portion on the opening side of the can. It is characterized by being.

  The printing deviation value measurement result obtained by the printing deviation value measuring means is fed back to the printing press, and the position of the plate cylinder is automatically adjusted by the registration device based on the printing deviation value measurement result. As a result, it is possible to correct (register) the printing misalignment value (position displacement of the plate cylinder of the printing press) before defective printing misalignment occurs, and maintain a good printing state. In this way, the measurement result of the printing deviation in the can inspection machine is immediately fed back to the printing machine, thereby preventing the occurrence of defective printing deviation and correcting the printing deviation before the defective printing deviation is produced.

  Each plate cylinder of the printing machine is preferably configured to print an inspection mark used for detecting a printing deviation value of each plate cylinder on an end portion on the opening side of the can.

  The opening side end portion of the can is a portion covered with a lid, and in the conventional can, printing is not performed and there is no need to inspect. In the printing apparatus according to the present invention, a print deviation value inspection mark is printed for each color at the opening side end of the can. The printed displacement value inspection mark disappears when the lid is put on, and in a state in which the beverage is filled and made into a product, the can is completely different from the conventional one in appearance.

  The print displacement value inspection mark is photographed by a camera provided in the can inspection machine. This print displacement value inspection camera is provided separately from the conventionally used image inspection camera.

  The registration device includes axial movement means for moving the plate cylinder in the axial direction and circumferential movement means for moving the plate cylinder in the circumferential direction. The axial movement means is non-rotatable and axially movable. An axially moving member that is supported by the housing so as to move and moves in the axial direction integrally with the plate cylinder shaft, and an axial driving means for moving the axially moving member are supported in such a manner as to be immovable in the axial direction. A first rotation shaft, a first female screw member that is supported in a non-rotatable manner and screwed to a male screw portion provided on the first rotation shaft, and a first motor that drives the first rotation shaft; The circumferential direction moving means is attached to the plate cylinder shaft so as to be integrally rotatable and relatively movable in the axial direction, meshed with a helical gear provided so as not to be axially movable, and moved in the axial direction to move the plate. Equipped with a circumferential movement member that moves the barrel axis in the circumferential direction The circumferential direction driving means for moving the circumferential direction moving member includes a second rotation shaft that is supported so as not to move in the axial direction, and a male screw portion that is supported so as not to rotate and is provided on the second rotation shaft. And a second motor that drives the second rotating shaft, and a control device that controls the first motor prints in the height direction of the can in the printing deviation value measuring means. The control device for adjusting the axial position of the plate cylinder by driving the first motor according to the deviation value and controlling the second motor, according to the printing deviation value in the circumferential direction of the can in the printing deviation value measuring means. It is preferable that the circumferential position of the plate cylinder is adjusted by driving the second motor.

  Conventionally, the registration device is a manual type, and a skilled worker is required to correct (register) the plate cylinder position based on the state of printing misalignment. In the printing device according to the present invention, Registration is automatic. The control device for controlling the first motor adjusts the axial position of the plate cylinder by driving the first motor according to the printing deviation value in the height direction of the can in the printing deviation value measuring means, and the second The control device for controlling the motor is adapted to adjust the circumferential position of the plate cylinder by driving the second motor in accordance with the circumferential printing displacement value of the can in the printing displacement value measuring means. Accurate automatic registration with a simple configuration is realized.

  The can inspection machine includes, for example, a rotating device that rotates the can, a photographing device that captures an image of the rotating can, and an image processing device that processes the captured image, and can inspection that inspects the printing state of the can. In the apparatus, the imaging device includes a first camera that captures an image of the entire can and a second camera that captures an image of the opening side end of the can, and the image processing device includes the first camera. The image inspection means for inspecting whether the image is correctly printed as compared with the master image using the image captured in step 1, and the position specified for each color using the image captured by the first camera Using the density measuring means for measuring the density at the image and the image taken by the second camera, the deviation value for the set position of the print misalignment inspection mark printed on the opening side end of each can is measured for each color. Printing deviation value measuring means It is things.

  The first camera is conventionally used to perform image inspection, and image inspection and density measurement can be performed by using the first camera. A 2nd camera shall image | photograph only the opening side edge part of a can.

  In the inspection by the image inspection means, the master image and the photographed image are compared for each pixel, and the partial omission of the image, the stain due to ink scattering, etc. are inspected.

  An ink supply device of a printing machine is provided with a plurality of ink call rollers divided in the length direction of the ink fountain roller in the vicinity of the ink fountain roller constituting the ink fountain. The ink feeding device control unit can switch between a calling position that contacts the ink fountain and a non-calling position that is separated from the ink fountain roller. Ink is called by switching the position of each ink, and the contact length between the ink call roller and the ink fountain roller is controlled for each ink call roller by controlling the rotation angle of the ink fountain roller from contact with the ink fountain roller until it leaves. The image processing device of the can inspection machine controls the density of the image printed on the can for each color. The ink supply device further includes density measuring means for measuring each predetermined location corresponding to each ink calling roller and outputting the measured result to the control device of the ink supply device. It is preferable to adjust the contact length between each ink calling roller and the ink fountain roller for each color based on each density value output from.

  In the inspection by the concentration measuring means of the can inspection machine, the concentration at a location (density measurement location) designated for each color is measured. The density measurement result is fed back to the printing machine, whereby the density can be corrected before a defective product is produced, and a good printing state can be maintained.

  According to the can printing apparatus of the present invention, as described above, the printing deviation value measurement result in the can inspection machine is immediately fed back to the printing machine, thereby correcting the printing deviation before a defective printing deviation is produced. Therefore, it is possible to prevent the occurrence of defective printing misalignment.

FIG. 1 is a block diagram showing an embodiment of a can printing apparatus of the present invention. FIG. 2 is a diagram schematically showing a schematic configuration of the can inspection machine. FIG. 3 is a side view showing the printing press. FIG. 4 is an enlarged side view of the main part of the printing press. FIG. 5 is a schematic side view of the main part of the ink supply device of the printing press. 6 is a partially cutaway plan view of the ink transfer roller unit of FIG. FIG. 7 is a cross-sectional view of FIG. FIG. 8 is a longitudinal sectional view of a registration device of a printing press. FIG. 9 is a front view of the can inspection machine. FIG. 10 is a diagram showing concentration data obtained by a can inspection machine. FIG. 11 is a diagram showing a printing misalignment value obtained by a can inspection machine.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an embodiment of a can printing apparatus (1) according to the present invention. The can printing device (1) includes a printing machine (2) that performs printing on the can (C), a dryer (4) that dries the printing surface of the can (C) after printing, and the printing state of the printing surface. A can inspection machine (5) for inspecting and a transport device (50) for transporting the can (C) are provided.

  The printing machine (2) performs printing on a cylindrical can body (a two-piece can body, hereinafter referred to simply as a can (C)) having an open top.

  After the can (C) is printed by the printing machine (2), it passes through the dryer (4) and is sent downstream. Some of the cans (C) that have passed through the dryer (4) are inspected for printing in the can inspection machine (5).

  The conveying device (50) supplies the can (C) to the printing machine (2) and passes the printed can (C) to the downstream and the dryer (4). The extraction line (50b) that sends a part of the large number of cans (C) to the can inspection machine (5), and the can (C) that was judged good in the can inspection machine (5) to the main line (50a) And a return line (50c).

  In the can inspection machine (5), as schematically shown in FIG. 2, the can (C) is rotated by the rotating device (51), and the driving side and the driven side can (C) of the rotating device (51) Are synchronized via the encoder (92), an image is captured by the imaging device (52), and the image is processed by the image processing device (53).

  As shown in FIG. 1, an image inspection device (54), a density measuring device (55), and a printing displacement value measuring device (53) are provided as an image processing device (53) for processing a photographed image. 56). The can (C), which is regarded as a non-defective product in the can inspection machine (5), is returned to the main line (50a) as described above, and the can (C ') which has been rejected in the inspection machine (5). Is discharged to the inspection reject product storage section (57).

  The density obtained by the density measuring means (55) in the can inspection machine (5) and the printing deviation value obtained by the printing deviation value measuring means (56) are fed back to the printing machine (2). In the printing machine (2), the ink supply amount is adjusted by the control device (34) according to the density, and the plate cylinder position is adjusted by the automatic registration device (58) according to the printing misalignment value.

  As shown in FIGS. 3 and 4, the printing machine (2) includes a plurality (eight illustrated) plate cylinders (47) each having a plate for printing different colors, and a plate cylinder (47). The blanket cylinder (48) to which ink is transferred from the printer, the ink supply device (3) for supplying ink to each plate cylinder (47), and the position adjustment (registration) of the plate cylinder (47) And a can feeding device (59) comprising a plurality of can feeding rollers (59a) and a can feeding chute (59b).

  The registration device (58) includes axial movement means (96) for moving the plate cylinder (47) in the axial direction and circumferential movement means (97) for moving the plate cylinder (47) in the circumferential direction. Yes. As shown in FIG. 4, the registration device (58) is provided with controllers (124) and (125) for controlling the motors (109) and (110) provided in the moving means (96) and (97). ing.

  5 to 7 show the ink supply device. In the following description, the right side (lower side in FIG. 6) in FIG. 5 is front, the left side (upper side in FIG. 6) in FIG. 5 is rear, and left and right when viewed from the front are left and right.

  As shown in an enlarged view in FIG. 5, in the ink supply device (3), the ink fountain roller (41) is disposed so as to be close to the rear end portion of the ink fountain member (40). (42) is formed, and an ink passage (43) having a predetermined gap is formed between the rear end portion of the ink fountain member (40) and the surface of the ink fountain roller (41).

  The first ink kneading roller (44) of the plurality of ink kneading rollers (44) (46) is arranged behind the ink fountain roller (41), and the ink fountain roller (41) and the ink kneading roller (44) are arranged. In between, the ink calling roller unit (45) is disposed adjacent to both. As shown in FIG. 5, the roller unit (45) is an aggregate of a plurality (seven in the drawing) of ink calling rollers (15) divided in the axial direction of the rollers (41) and (44). Ink calling rollers (15) are arranged at small intervals in the axial direction. The axes of these rollers (15) (41) (44) are parallel to each other and extend in the left-right direction. The ink fountain roller (41) and the ink kneading roller (44) are rotatably supported by the frame (7) of the printing press, and are continuously driven in a direction indicated by an arrow in FIG. Rotated. For example, the rotation speed of the ink fountain roller (41) is about 1/10 of that of the ink kneading roller (44).

  Details of the calling roller unit (45) are shown in FIGS. FIG. 6 is a partially cutaway plan view of the roller unit (45), and FIG. 7 is an enlarged cross-sectional view of FIG. 6 viewed from the left side.

  The left and right ends of the linear support member (6) parallel to the rollers (41) and (44) are fixed to the frame (7), and a plurality of movable members (8) are attached around the support member (6). Yes. The support member (6) has a prismatic shape having a slightly larger front-rear width than a vertical width. The movable member (8) has a short cylindrical shape, and the movable member (8) is formed with a relatively large square hole (9) penetrating in the axial direction. A plurality of movable members (8) are arranged in the axial direction between a pair of short cylindrical fixed members (10) fixed to the frame (7) so as to face each other and penetrated through the support member (6). The support member (6) is passed through the hole (9) of the movable member (8). The vertical width of the hole (9) of the movable member (8) is substantially equal to the vertical width of the support member (6), and the upper and lower surfaces of the hole (9) are in sliding contact with the upper and lower surfaces of the support member (6). Further, the front and rear width of the hole (9) is slightly larger than the front and rear width of the support member (6), and the movable member (8) has a rear surface of the hole (9) with respect to the support member (6). The front end position in contact with the rear surface and the rear end position in which the front surface of the hole (9) contacts the front surface of the support member (6) can be moved back and forth. On the upper surface of the hole (9) of the movable member (8) that is in sliding contact with the support member (6), a corner groove (11) is formed over the entire length of the movable member (8).

  As will be described later, each movable member (8) is positioned in the axial direction with respect to the support member (6), and between the movable members (8) and between the fixed members (10) at both ends, A slight gap is provided in the axial direction. Therefore, each movable member (8) can move individually in the front-rear direction with respect to the support member (6).

  An inner ring of a ball bearing (12) that is a rolling bearing is fixed to the outer periphery of each movable member (8). A metal sleeve (14) is fixed to the outer periphery of the outer ring of each ball bearing (12), and a rubber thick cylindrical ink call roller (15) is fixed to the outer periphery of the sleeve (14).

  A short cylindrical dust-proof member (16) is fitted between the outer peripheries of adjacent movable members (6). The dust-proof member (16) is made of an appropriate rubber-like elastic material such as natural rubber, synthetic rubber, or synthetic resin, for example, and flange portions (16a) that slightly protrude inward are integrally formed at both ends thereof. These flange portions (16a) are fitted into annular grooves (17) formed on the outer peripheral surface of the portion near the left and right ends of the movable member (8), whereby the dustproof member (16) is moved to the movable member (8). It is fixed to. A similar dustproof member (16) is fitted between the outer peripheries of the movable member (8) at the left and right ends and the fixed member (10) adjacent thereto.

  On the support member (6) side between each movable member (8) and the support member (6), a roller position switching device (19) for switching the position of the ink calling roller (15) is provided as follows. .

  A cylinder portion (20) is formed by forming a hole extending from the front to the rear a little at the portion of the support member (6) corresponding to the axial central portion of the movable member (8), and from the rear surface to the front a little. An extended spring accommodating hole (21) is formed. The center of the cylinder part (20) and the center of the spring accommodating hole (21) are on one straight line in the front-rear direction near the center of the movable member (8) in the vertical direction. A short cylindrical piston (22) is inserted into the cylinder part (20) through an O-ring (23) so as to be slidable back and forth. A ball (24) as an urging member is slidably inserted in the spring accommodating hole (21), and a compression coil spring (25) that urges the ball backward is inserted.

  Recesses (26) and (27) are formed on the front surface of the hole (9) of the movable member (8) facing the center of the piston (22) and the rear surface of the hole (9) facing the center of the ball (24), respectively. Is formed. The width of each recess (26) and (27) in the axial direction of the movable member (8) is constant. The cross-sectional shape of each of the recesses (26) and (27) in the cross section orthogonal to the axis of the movable member (8) is uniform, and forms an arc shape centering on a straight line parallel to the axis. A taper-shaped protrusion (22a) is formed at the center of the end face of the piston (22) facing the recess (26), and the protrusion (22a) is fitted into the recess (26). Note that the length of the piston (22) excluding the protrusion (22a) is slightly shorter than the length of the cylinder part (20), so that the protrusion even when the piston (22) is most retracted into the cylinder part (20). Most of (22a) protrudes from the front surface of the support member (6). On the other hand, a part of the outer periphery of the ball (24) is fitted in the recess (27).

  At the rear part of the support member (6), the ball (24) is always brought into pressure contact with the rear surface of the hole (9) of the movable member (8) by the elastic force of the spring (25), and the ball (24) has an outer periphery. The portion is fitted into the recess (27) and is brought into pressure contact with the front and rear edges of the recess (27). On the other hand, at the front part of the support member (6), the front surface of the support member (6) or the piston (22) is brought into pressure contact with the front surface of the hole (9) of the movable member (8), and the protrusion ( Most of 22a) is in the recess (26). In this way, most of the protrusion (22a) of the piston (22) and a part of the ball (24) are always fitted in the recesses (26) and (27), so that the support member (6) The movable member (8) is positioned in the axial direction.

  The support member (6) is formed with a circular air supply hole (28) extending in the axial direction from the left end and closed in the vicinity of the right end, and the left end opening end of the hole (28) is connected through an appropriate pipe. Connected to a compressed air source (29).

  A switching valve (solenoid valve) (30) is mounted on the upper surface of the support member (6) facing the groove (11) of the movable member (8), and the two ports of this valve (30) are connected to the support member (6 ) Are communicated with the air supply hole (28) and the cylinder part (20) through the communication holes (31) and (32) formed in the above. Further, the electric wire (33) of the valve (30) is drawn out through the groove (11) and connected to the control device (34).

  When the valve (20) is energized (on state), the cylinder part (20) is communicated with the air supply hole (28) via the valve (30), and when the energization is stopped (off state), the cylinder part (20) is in communication with the atmosphere via valve (30). Then, by individually switching the energization state of the valve (30) of each switching device (19) by the control device (34), the position in the front-rear direction of each ink calling roller (15) is individually switched.

  When the valve (30) is switched to the off state, the cylinder (20) is brought into communication with the atmosphere, so that the piston (22) can move freely within the cylinder (20). For this reason, the movable member (8) is moved to the rear side via the ball (24) by the spring (25). As a result, the movable member (8) and the ink calling roller (15) are switched to the rear end position (non-calling position), and the ink calling roller (15) is separated from the ink fountain roller (41) and the ink kneading roller (44 ).

  When the valve (30) is switched on, the cylinder part (20) communicates with the air supply hole (28) and further through the compressed air source (29), so that the compressed air is supplied to the cylinder part (20). Is supplied. For this reason, against the force of the spring (25), the piston (22) protrudes forward from the support member (6), and thereby the movable member (8) is moved forward. As a result, the movable member (8) and the ink calling roller (15) are switched to the front end position (calling position), and the ink calling roller (15) moves away from the ink kneading roller (44) and presses against the ink fountain roller (41). To do.

  A position switching detection sensor (35) composed of a magnetic sensor is fixed in an embedded manner on the lower surface of the support member (6) that is in sliding contact with the bottom wall of the hole (9) of the movable member (8), and a movable member ( A permanent magnet (36) is fixed in an embedded manner to the bottom wall of the hole (9) of 8). The lower surface of the sensor (35) is flush with the lower surface of the support member (6) or slightly inward (upper side). The upper surface of the permanent magnet (36) is flush with the bottom wall surface of the hole (9) of the movable member (8) or slightly inside (lower). In the state where the movable member (8) is switched to the rear end position, the sensor (35) is opposed to the central portion in the front-rear direction of the permanent magnet (36), and in the state where the movable member (8) is switched to the front end position, The sensor (35) is detached rearward from the permanent magnet (36). Therefore, the output of the sensor (35) varies depending on the position of the movable member (8), and the position of the movable member (8), that is, the ink calling roller (15), can be determined from the output of the sensor (35).

  The ink in the ink fountain (42) passes through the ink passage (43) and exits to the outer peripheral surface of the ink fountain roller (41). The film thickness of the ink that appears on the surface of the ink fountain roller (41) corresponds to the size of the gap of the ink passage (43), and by adjusting the size of the gap of the ink passage (43), the ink fountain roller (41 The film thickness of the ink coming out on the surface is adjusted. Usually, the size of the gap of the ink passage (43) is adjusted so that the ink film thickness becomes equal for all the ink calling rollers (15). The ink that has appeared on the outer peripheral surface of the ink fountain roller (41) is transferred to the ink call roller (15) while the ink call roller (15) is switched to the front end position, and each ink call roller (15). The ink transferred to is transferred to the ink kneading roller (44) while the ink calling roller (15) is switched to the rear end position. The ink transferred to the ink kneading roller (44) is supplied to the printing surface through a plurality of other ink kneading rollers (not shown). Also, the output of the sensor (35) detects whether or not the switching of the ink call roller (15) is normal, and if the ink call roller (15) is not switched normally, an alarm is issued. It is done.

  In the printing press (2), the controller (34) calls the ink by switching the position of the required ink call roller (15) at every call timing with a predetermined interval, and for each ink call roller (15). By controlling the rotation angle (contact rotation angle) of the ink fountain roller from contact with the ink fountain roller (41) until it leaves, the circumference of the ink that is called from the ink fountain roller (41) to the ink call roller (15) is controlled. The length is controlled, and as a result, the amount of ink supplied to the printing surface is adjusted by the position in the width direction.

  The contact rotation angle is controlled by the time from the output of the switching command (contact command) to the calling position to the ink calling roller (15) until the output of the switching command (non-contact command) to the non-calling position (contact command). Time).

  When the density of a certain color among 8 colors is low, the contact time in the ink supply device (3) for this color is lengthened, and when the density of a certain color is high, the ink supply device for this color (3) The density can be adjusted by shortening the contact time at.

  FIG. 8 shows a registration device (58) of the printing machine (2). In the description of the registration device (58), the vertical and horizontal directions refer to the vertical and horizontal directions in FIG.

  As shown in FIG. 8, the axial movement means (96) for moving the plate cylinder (47) in the left-right direction (axial direction) is a sleeve (cylindrical shape) that moves in the axial direction integrally with the plate cylinder shaft (47a). Axial moving member) (102). The sleeve (102) is supported by the cylindrical plate cylinder shaft housing (101) so as not to rotate but to be movable in the axial direction. The plate cylinder shaft (47a) is supported by the sleeve (102) through a bearing (103) so as to be rotatable and not movable in the axial direction. The plate cylinder shaft (47a), the sleeve (102), and the plate cylinder shaft housing (101) are arranged concentrically.

  The circumferential direction moving means (97) for moving the plate cylinder (47) in the circumferential direction is a spline shaft portion provided at the right end of the plate cylinder shaft (47a) extending rightward from the center of the plate cylinder (47). A spline cylinder (circumferential movement member) (104) fitted to (47b) is provided. An annular groove is formed on the outer periphery of the spline cylinder (104), and a helical gear (105) is fitted into the annular groove and fixed. The helical gear (105) is meshed with a helical gear (106) arranged so as not to move in the axial direction. The spline cylinder (104) is attached to the spline shaft portion (47b), that is, the plate cylinder shaft (47a) by spline fitting so as to be integrally rotatable and relatively movable in the axial direction. The plate cylinder shaft (47a) moves in the circumferential direction as the spline cylinder (104) moves in the axial direction by meshing the helical gears (105) and (106).

  The plate cylinder shaft housing (101) is fixed to a frame (107) orthogonal to the plate cylinder shaft housing (101). A right end portion of a motor housing (108) disposed in parallel with the plate cylinder shaft housing (101) is fixed to the frame (107) above the plate cylinder shaft housing (101).

  At the left end of the motor housing (108) are two motors, a first motor (109) on the lower side (side closer to the plate cylinder (47)) and an upper side (side far from the plate cylinder (47)). A second motor (110)) is arranged.

  In the motor housing (108), a hollow outer rotating shaft (first rotating shaft) (111) rotated by the first motor (109) and a second outer rotating shaft (111) are disposed concentrically. A solid inner rotating shaft (second rotating shaft) (112) rotated by the motor (110) is rotatably arranged.

  A drive gear (113) is attached to the right end of the drive shaft (109a) extending to the right of the first motor (109), and the drive gear (113) and the left end of the outer rotary shaft (111) are attached to the right end of the drive shaft (109a). A driven gear (114) provided integrally is meshed. A drive gear (115) is attached to the right end portion of the drive shaft (110a) extending to the right side of the second motor (110), and the drive gear (115) and the left end portion of the inner rotary shaft (112) are attached to the right end portion. A driven gear (116) provided integrally is meshed.

 The outer rotating shaft (111) is rotatably supported by the motor housing (108) via a bearing (117). The inner rotary shaft (112) is supported by the outer rotary shaft (111) via a bearing (118) so as to be relatively rotatable. As a result, the outer rotating shaft (111) and the inner rotating shaft (112) rotate independently of each other.

  A male screw portion (111a) is provided at the right end of the outer rotating shaft (111), and the first female screw member (119) is screwed into the male screw portion (111a). The right end of the inner rotary shaft (112) protrudes to the right of the right end of the outer rotary shaft (111), and this right end is provided with a male screw portion (112a). 112a) is screwed with the second female thread member (120).

  Each female thread member (119) (120) is fixed to the frame (107) and is slidably fitted to a pair of guide bars (121) extending in the right direction parallel to the respective rotation shafts (111) (112). It is put. As a result, the female thread members (119) and (120) are made non-rotatable. As the rotary shafts (111) and (112) rotate, the left and right directions (the axes of the rotary shafts (111) and (112)) Direction).

  The first female thread member (119) screwed to the outer rotating shaft (111) is engaged with the sleeve (102) to connect the first female thread member (119) and the sleeve (102). The connecting member (122) is fixed. As a result, the first female thread member (119) and the sleeve (102) move integrally in the axial direction as the outer rotary shaft (111) rotates.

  The second female screw member (120) screwed to the inner rotating shaft (112) is engaged with the spline tube (104) to connect the second female screw member (120) and the spline tube (104). The second connecting member (123) is fixed. Thereby, the second female screw member (120) and the spline cylinder (104) move integrally in the axial direction as the inner rotary shaft (112) rotates.

  The axial drive means (98) for moving the sleeve (102) as the axial movement member includes a first motor (109), an outer rotating shaft (111), a first female screw member (119), and a first connecting member ( 122).

  The circumferential direction driving means (99) for moving the spline cylinder (104) as the circumferential direction moving member includes a second motor (110), an inner rotating shaft (112), a second female screw member (120), and a second connecting member. (123).

  The control device (124) for controlling the first motor (109) includes a first motor according to a printing deviation value in the height direction of the can (C) in the printing deviation value measuring means (56) of the can inspection machine (5). The position of the plate cylinder (47) in the axial direction is adjusted by driving (109). The control device (125) for controlling the second motor (110) drives the second motor (110) in accordance with the printing deviation value in the circumferential direction of the can (C) in the printing deviation value measuring means (56). The circumferential position of the plate cylinder is adjusted.

  As shown in FIG. 9, the can inspection machine (5) is provided with a carry-in conveyor (61) for sequentially carrying in cans for inspection (C), and an inspection can (61) provided at the terminal end of the carry-in conveyor (61). C) from the carry-in conveyor (61), a take-out device (62), a can rotating device (51) that holds and rotates the inspection can (C) taken out by the take-out device (62), and a can (C ), A CPU for executing logical operations of the image processing device (53), a ROM for storing control programs, a RAM for storing data, etc., and a display for displaying image processing results A control unit (not shown) configured by a computer equipped with the above, a carry-out conveyor (not shown) that is provided in front of the carry-in conveyor (61) and carries out a non-defective can (C), and a can that does not pass inspection A discharge chute (64) for discharging (C ′).

  The take-out device (62) includes a suction part (65) that sucks the can that has been sent by the carry-in conveyor (61) and a cylinder part (66) that moves the suction part (65) upward. Yes. The adsorption part (65) has a semi-cylindrical recess (65a) into which an intermediate part of the can (C) is fitted.

  The can rotating device (51) includes a main shaft (71) rotated by a motor (72), and a rotating disk (73) attached to the main shaft (71). The motor (72) is attached to the upper surface of the top wall of the housing (70), and the main shaft (71) is rotatably supported on the top wall of the housing (70).

  The rotating disk (73) is concentric with the main shaft (71) and rotates integrally with the main shaft (71). A plurality of arms (73a) are provided on the outer periphery of the rotating disk (73) so as to protrude radially outward at equal intervals. A vertical driven side rotation shaft (74) is rotatably supported on each arm (73a) of the turntable (73). A holding member (75) which is formed concentrically with the driven side rotating shaft (74) and sucks and holds the can (C) is attached to the driven side rotating shaft (74).

  The driven rotary shaft (74) is moved along with the rotation of the turntable (73), the installation position of the take-out device (62), the installation position of the photographing device (52), the installation position of the carry-out conveyor (63), and the discharge chute ( Revolve around the main shaft (71) so as to return to the installation position of the take-out device (62) through the installation position of 64).

  A drive unit (76) for rotating (spinning) the driven side rotating shaft (74) is disposed above the driven side rotating shaft (74) located at the installation position of the imaging device (52), and the housing (70) Supported by the top wall. The drive device (76) includes a vertical drive side rotation shaft (77) and a motor (78) provided concentrically with the drive side rotation shaft (77) and rotating the drive side rotation shaft (77). Yes.

  As the photographing device (52), a first camera (79) for photographing the entire can and a second camera (80) for photographing the opening side end of the can are used. The image photographed by the first camera (79) is used by the image inspection means (54) and the density measurement means (55). The image photographed by the second camera (80) is used by the print misalignment value means (56).

  The holding member (75) is made of resin and has a cylindrical shape. A cylindrical suction chamber (not shown) that opens downward is provided at the lower end of the holding member (75). By making the suction chamber have a negative pressure (vacuum), the can (C) is adsorbed and held by the holding member (75).

  Image inspection by the image inspection means (54) of the can inspection machine (5) has been performed conventionally, and the image inspection means (54) compares the master image and the photographed image pixel by pixel. Inspects for partial omission of ink and stains due to ink scattering. In the image inspection means (54), defects exceeding a predetermined size are rejected as inspections, and those exceeding a deviation allowable value for the master image are also rejected as inspections.

  The inspection by the concentration measuring means (55) of the can inspection machine (5) is performed on the single-color solid portion. That is, since it is difficult to measure the density at a place where a plurality of colors are superimposed, a place where there is a monochromatic solid portion is designated in advance for each color, and the density at the designated place (density measurement place) is specified. Measure. The density value can be obtained as an arithmetic average value of the RGB components of the pixel that is set as the density measurement location, and can be obtained as a density difference from the density of the master image at each location. If the monochromatic solid part has a size of, for example, 0.8 mm × 0.8 mm, the density measurement is possible. If accurate density measurement is difficult because the size cannot be ensured or the like, Only whether the density difference is within the standard is determined. As shown in FIG. 10, the density is obtained for the number of ink call rollers (15) (seven) for one color. In this embodiment, since the number of colors (the number of plate cylinders) is 8, a density measurement value of 8 × 7 is obtained. The concentration measurement result shown in FIG. 10 is displayed on the display of the inspection apparatus (5).

  The control device (34) of the ink supply device (3) controls the contact time in the ink supply device (3) based on the preset density target value, and measures the concentration of the can detector (5). The concentration measurement result obtained by the means (55) is added to this control. Specifically, when the density of a color at a certain location is lighter than the target value, the ink calling roller supplying this color to this location is made darker by increasing the contact length with the ink fountain roller. If the density of the color at a certain location is higher than the target value, the contact length with the ink fountain roller is shortened for the ink calling roller supplying this color to this location.

In the example displayed in FIG. 8, for example, for the first color, No. No. 4 is relatively dark. 7 is relatively thin. For the second color, no. No. 4 is relatively dark. 2 is relatively thin. When such a density measurement result is output to the printing press (2), the ink supply device of the printing press (2) (the control device (34) of 39, for example, 1) No. 4 ink call roller that supplies ink to the color plate cylinder No. 7 ink call roller that supplies ink to the first color plate cylinder by shortening the contact length with the ink fountain roller In this case, the contact length with the ink fountain roller is changed so that the density of the first color is changed to be uniform as a whole.

  Thus, the density measurement result in the can inspection machine (5) is immediately fed back to the printing machine (2), and the position of each ink call roller (15) is controlled by the control device (34) of the ink supply device (3). The amount of ink supplied is changed. Thereby, the density can be corrected before the defective product is produced, and the generation of the defective product can be prevented.

  The opening side end portion of the can (C) is a portion that is covered with a lid, and in the conventional can, there is no printing, and there is no need for inspection. With respect to the can (C) to be inspected by the inspection apparatus (5) of this embodiment, a printing displacement value inspection mark is printed for each color on the opening side end of the can (C). That is, on the printing surface of the can (C), as shown in FIG. 11 (a), in addition to the conventional items such as product name, company name, component, barcode, etc., for printing displacement value inspection indicated by A A mark has been added.

  The print misregistration value inspection marks (A) are provided for all eight colors from 1 to 8, as shown in an enlarged view in FIG. A position indicated by a solid line in the figure is a reference position (a position of a designated mark in the master image), and a position indicated by a two-dot chain line in the figure is a position of each color obtained from the photographed image. From FIG. For the color No. 7, the printing misalignment is very small. For the color No. 3, the printing misalignment value in the height direction of the can (C) (sometimes referred to as “height direction”) is large. For the color No. 6, it can be seen that the printing deviation value in the circumferential direction of the can (C) is large. The print misalignment value is obtained as a value of how many pixels (or how many mm) the designated mark position in the master image and the designated mark position in the photographed image are shifted, and this numerical value is as shown in FIG. And displayed on the display of the inspection device (5). The printing misalignment value is determined for each of the can height direction (axial direction of the plate cylinder (47)) and the can circumferential direction (circumferential direction of the plate cylinder (47)).

  The printing deviation value in the height direction of the can (C) is sent to a control device (124) that controls the first motor (109) of the registration device (58), and the control device (124) In response to this, the first motor (109) is driven, whereby the axial position of the plate cylinder (47) is automatically adjusted. The printing deviation value in the circumferential direction of the can (C) is sent to the control device (125) that controls the second motor (110) of the registration device (58), and the control device (125) Accordingly, the second motor (110) is driven, and thereby the circumferential position of the plate cylinder (47) is automatically adjusted.

  In this way, the measurement result of the printing displacement value in the can inspection machine (5) is immediately fed back to the printing machine (2), and the position adjustment (registration) of the plate cylinder (47) is performed by the registration device (58). As a result, the printing misalignment value can be corrected before defective printing misalignment is produced, and the occurrence of defective printing misalignment can be prevented.

(1) Can printing device
(2) Printing machine
(3) Ink supply device
(5) Can inspection machine
(47) Plate cylinder
(47a) Plate cylinder axis
(51) Rotating device
(52) Camera
(53) Image processing device
(54) Image inspection means
(55) Concentration measuring means
(56) Means for measuring printing misalignment
(96) Axial moving means
(97) Circumferential movement means
(98) Axial drive means
(99) Circumferential drive means
(101) Housing
(102) Sleeve (Axial moving member)
(104) Spline cylinder (circumferential moving member)
(106) helical gear
(109) 1st motor
(110) Second motor
(111) Outer rotation axis (first rotation axis)
(111a) Male thread
(112) Inner rotation axis (second rotation axis)
(112a) Male thread
(119) First female thread member
(120) Second female thread member
(124) First motor controller
(125) Second motor controller

Claims (3)

A can printing apparatus comprising a printing machine having a plurality of plate cylinders for printing different colors and printing on a can, and a can inspection machine for inspecting a printing state,
The can inspection machine includes a can rotating device for rotating the can, a can photographing device for photographing an image of the can, and an image processing device for processing the photographed image, and the image processing device includes a print displacement printed on the can. It has a print deviation value measuring means for measuring the deviation value with respect to the set position of the inspection mark,
The printing machine has a registration device that automatically performs registration of the plate cylinder based on the printing misalignment value measured by the can inspection machine ,
Each printing cylinder of a printing machine prints the inspection mark used for the detection of the printing shift value of each printing cylinder on the edge part by the side of the opening of a can, The can printing apparatus characterized by the above-mentioned. The registration apparatus includes an axial direction moving means for moving the plate cylinder in the axial direction, and a circumferential direction moving means for moving the plate cylinder in the circumferential direction.
The axial direction moving means includes an axial direction moving member that is supported by the housing so as not to rotate and is movable in the axial direction and moves in the axial direction integrally with the plate cylinder shaft, and moves in the axial direction. Includes a first rotating shaft supported so as not to move in the axial direction, a first female screw member supported so as not to rotate and screwed to a male screw portion provided on the first rotating shaft, and a first rotation A first motor for driving the shaft,
The circumferential direction moving means is attached to the plate cylinder shaft so as to be integrally rotatable and relatively movable in the axial direction, meshed with a helical gear provided so as not to be axially movable, and moved in the axial direction to move the plate. A circumferential direction moving member that moves the trunk shaft in the circumferential direction is provided, and the circumferential direction driving means that moves the circumferential direction moving member is configured to be non-rotatable with the second rotating shaft that is supported so as not to move in the axial direction. A second female screw member that is supported and screwed into a male thread portion provided on the second rotary shaft, and a second motor that drives the second rotary shaft;
The control device for controlling the first motor adjusts the axial position of the plate cylinder by driving the first motor according to the printing deviation value in the height direction of the can in the printing deviation value measuring means, and the second motor The control device to be controlled is configured to adjust the circumferential position of the plate cylinder by driving the second motor in accordance with the circumferential printing displacement value of the can in the printing displacement value measuring means. The can printing apparatus according to claim 1 . An ink supply device of a printing machine is provided with a plurality of ink call rollers divided in the length direction of the ink fountain roller in the vicinity of the ink fountain roller constituting the ink fountain. The ink feeding device control unit can switch between a calling position that contacts the ink fountain and a non-calling position that is separated from the ink fountain roller. Ink is called by switching the position of each ink, and the contact length between the ink call roller and the ink fountain roller is controlled for each ink call roller by controlling the rotation angle of the ink fountain roller from contact with the ink fountain roller until it leaves. Control,
The image processing apparatus of the can inspection machine has a density measuring means for measuring the density of the image printed on the can for each color and for each predetermined location corresponding to each ink calling roller, and outputting it to the controller of the ink supply apparatus. In addition, the control device of the ink supply device adjusts the contact length between each ink calling roller and the ink fountain roller for each color based on each density value output from the density measuring means of the can detector. The can printing apparatus according to claim 1 or 2 .

Images