JPS5849256A - Self-aligning device in multicolor printer for drum part of cylindrical body - Google Patents

Abstract

PURPOSE:To provide a device which performs a self-aligning through a visual check and manual operation by an operator, by constituting the device such that a plate cylinder is corrected in a peripheral direction and axial direction through detection of a check mark formed in a plate surface of each of plate cylinders. CONSTITUTION:An aligning check mark 15 is formed in a plate surface of each of plate cylinders 1a-1d, and check mark-detecting sensors 6a-6d are installed in the proximity of the plate cylinders 1a-1d, respectively. On a basis of the detection of the check mark by means of the sensor, a correction amount in a peripheral direction and axial direction of a cylinder is computed, and based on the correction amount, driving devices for the peripheral direction corrector and the axial direction corrector of the plate cylinder are controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic registration device for a multicolor printing machine for external surfaces of cylindrical article bodies.

A printing machine that prints on the outer surface of the body (hereinafter referred to as the body outer circumferential surface) of a cylindrical article such as a cylindrical can body (hereinafter referred to as the can body) is placed adjacently in the middle of the conveyance path of one can body. A blanket cylinder that rolls into contact with the outer peripheral surface of the plate and transfers ink to the outer peripheral surface, a plate cylinder that transfers the ink on the printing plate to the blanket cylinder, and an ink station that supplies ink to the plate cylinder. .

The printing machine configured as described above can be applied to both monochrome printing and multicolor printing, but when applied to multicolor printing, two or more plate cylinders are arranged according to the number of colors. for example,
In a four-color printing machine, four plate cylinders are arranged. In addition, the blanket cylinder is 1 to 4 color printing machines.
40 can be arranged in various ways.

Different plates are removably arranged on the outer peripheral surface of each plate cylinder arranged in a multicolor printing machine.
When the print content is changed, the plate is removed and another new plate is placed.

In multicolor printing, accurate K-it reference positions for each plate are essential for high-quality printing, and therefore registration is performed each time a new plate is placed on the plate cylinder.

In general, the registration of the above-mentioned can body curved multicolor printing machine is performed by first aligning the plate cylinders on which the reference plates are placed, and then setting each plate cylinder on which the plates are placed in their approximate positions. After that, visually check the printing condition of each can while actually printing the can, and manually rotate and slide the cylinder shaft of each plate cylinder to determine the circumferential and axial position of the plate cylinder. A method of adjusting and correcting the position of the plate relative to the blanket cylinder is employed.

However, in the conventional registration method described above, the work relies on the intuition of the operator while actually printing the can body.
The current situation is that adjustment takes a long time, a large number of defective printed cans that cannot be used occur in proportion to one adjustment time, and the printing quality is inconsistent and low.

In particular, when performing multicolor halftone dot printing using the apparatus shown in Figure 1, which will be described later, high precision registration is required because halftone dot printing is a printing method that draws a pattern using a collection of minute inks. However, in the conventional method that relies on the operator's intuition, the above-mentioned drawbacks are exacerbated.

The present invention provides an automatic registration device that automatically performs the conventional visual and manual registration performed by an operator.

That is, the present invention includes one or more blanket cylinders that roll into contact with the outer circumferential surface of a cylindrical article body and transfer ink to the outer circumferential surface, and two or more plates that transfer ink from the plate surface to the blanket cylinders. In a multi-color printing machine for the outer surface of a cylindrical article body having a cylinder, a registration check mark is provided on the plate surface of each plate cylinder, and a sensor that detects and reacts to the check mark is provided on each plate cylinder. Additionally, a plate cylinder circumferential correction device is provided on the plate cylinder, which is driven by a drive device to move the plate cylinder in the circumferential direction.

The plate cylinder is provided with a plate cylinder axial direction correction device that is driven by a drive device to move the plate cylinder in the axial direction, and the plate cylinder is adjusted in the circumferential direction and the axial direction based on the detection of the check mark by the sensor. A cylindrical article barrel characterized by being provided with an arithmetic control device that calculates a correction amount and controls each driving device of the plate cylinder circumferential direction correction device and the axial direction correction device based on the calculated correction amount. This is an automatic registration device in external aspect multicolor printing machines.

The following will be explained based on the drawings.

FIG. 1 is a schematic front view of a four-color dot printing machine to which the present invention is applied, and the configuration of the machine will be explained first.

In the figure, 1axld is a 7f11 to 4-plate cylinder, 2a to 2d is a dot plate (hereinafter referred to as a plate) provided on each outer peripheral surface of the /I61 to 4-plate cylinder, and 3 to 3
d is an ink station that supplies ink to each plate; 4
, 4'1dA1.42 blanket cylinder, 5.
5' is 41. Blanket arranged on each outer circumferential surface of the A2 blanket cylinder (5a to 5d in the figure indicate sections), 6a to 6d are sensors fixedly arranged close to each of the JI & 1 to A4 plate cylinders, 7 is a mandrel A wheel, 8 a mandrel installed on a mandrel wheel, 9 a can body, 10 a can supply device, 11 a finishing varnish coating roll, 12 a can body transfer device, 13 a no-can sensor, and 14 a frame.

, Incidentally, in the above reference numerals, those with the numerals a to d written together will be collectively referred to as the numerals omitting the numerals atsu to d unless a distinction is particularly required.

The can body 9 has a can body supply bag [10].
is a predetermined conveyance path (
In this example, the blanket 5 placed on the A1 blanket cylinder 4 is traveling along a circular path) and is rotating.
section (in this section, ink is transferred from the A1 plate cylinder 1a, the outer peripheral surface of the can body 9 and the blanket 5 start rolling contact, and the first rotation of the can body brings the blanket into contact with section 51). At the same time as the first color is transferred to the outer peripheral surface, in the second rotation, section 5b of the blanket (
Ink is transferred to this section from a circular two-plate cylinder. ), and at the end of the second rotation, the contact with section 5b of the blanket is completed and the second color is transferred to the outer peripheral surface, and then, the can body 9 is moved along the conveying path by restarting the rotation of the mandrel wheel 7. Progressing and making one revolution 4
2 reaches the contact start position with the starting end of section 50 of blanket 5' disposed on cylinder 4', and thereafter, in the same manner as described above, during two rotations of the can body 9, sections 5c and 5d of the blanket After rolling contact with the section, the third and fourth colors are transferred to the outer circumferential surface, and the mandrel wheel 7 resumes rotation to proceed along the conveying path and the finishing varnish is applied by the finishing varnish application roll 11. , are transferred to the transfer device 12 by a device not shown.

In addition, the length of the outer peripheral surface of the plate cylinder in the circumferential direction of the nine plates 2a to 2d disposed in the plate cylinders 1a to 1d, respectively, is equal to the length of the outer peripheral surface of the can body 9. Planchera arranged respectively) 5
, 5', each section 5a to 5d is equal to the length of the outer peripheral surface of the can body 9.

In addition, multicolor halftone printing is a form of so-called overlapping printing in which the upper layer ink partially overlaps the lower layer ink, so
The ink station 3
The ink stored at the end of the can is prepared so that the ink that is transferred first to the can body has the highest viscosity, and the viscosity decreases in the following order.

Hereinafter, a specific example apparatus of the present invention applied to a printing machine having the above structure will be explained.

FIG. 2 is an explanatory diagram showing only the essential parts in FIG. 1, and FIGS. 3(a) and 3(b) are explanatory diagrams of registration check marks.

A V-shaped registration check mark (hereinafter referred to as a check mark) 15 shown in FIG. 3 is provided on each plate surface of the Al-A4 plate cylinders 1a to ld in FIG.
One line segment 15' of the shape is parallel to the axis of the plate cylinder (hereinafter this line segment 15' is referred to as the vertical line), and the other line segment 151 is at an appropriate angle from one end of the vertical line 15', counter-rotating the plate cylinder. These check marks are arranged extending in the direction (hereinafter, this line segment 151 is referred to as an inclined line), and each of these check marks is arranged on the plate so that each check mark coincides with each other when each plate is correctly superimposed. Ru.

Registration in the circumferential direction of the plate cylinder is based on the check mark 15 of the plate cylinder I-1a.
From the time when the sensor 6 detects the vertical line 15' of the check mark, other plate cylinders 1b+ whose diameter is 2 or less
Rotation angle aI, b until each sensor 6b, 6c, 6d detects the vertical line 15' of each check mark 1c+ld
Measure IICI.

Comparison calculations are made between these and the rotation angles a, b, and c obtained in advance when the register is correct, and the correction amounts (a-a'), (bb-b')*( c-c')
is calculated, and a drive device f of a plate cylinder circumferential direction correction device, which will be described later, is controlled based on the correction lid.

Also, the registration in the axial direction of the plate cylinder is /I61
Using the check mark 15 of plate cylinder/-1a as a reference, measure the distance d between the vertical line 15' of the check mark and the inclined line 15N using the sensor 6a, and then check the other plate cylinders lb, lc, which have %A2 or less. The same goes for each sensor 6b.

Measure the distances d', d#, d- using 6c and 6d, and compare and calculate the distance d of the check mark on the Al plate cylinder 1m with the distance d', d#, d# of the well tick marks below the f2 plate cylinder. Then, the correction amount of each plate cylinder (d-d'), < dapt) (d-d"
), and the drive device of the plate cylinder axial direction correction device, which will be described later, is controlled based on the correction amount.

Figures 4 to 7 show specific examples of the arithmetic and control device.
Figure 4 is an explanatory diagram of the principle for determining the amount of correction in the circumferential direction of the plate cylinder. Figure 5 is a block diagram of the arithmetic control circuit for the amount of correction in the circumferential direction of the plate cylinder. Figure 6 is the axial correction of the plate cylinder. FIG. 7, which is a diagram explaining the principle for determining the amount, is a block diagram of a calculation control circuit for the axial correction amount of the plate cylinder.

The correction amount in the circumferential direction of the plate cylinder is determined as described above, but specifically, the rotation angle is replaced with a nine-noise signal generated by a nosorus generator, and the set value ( a, b, c) and measured value d) (a'
, b', c') is calculated as the correction amount. The circuit that embodies this is shown in Figure 5. (Although only the circuit corresponding to 1dA2 plate cylinder 1bK is shown in the figure, the same applies to A3.I64 plate cylinder/-1c and ld.) The % sensor 6 is a phototube switch. When the check mark 15 of the 41 plate cylinder 11 is detected by the sensor 6a, the gate of the pulse processing unit 50 is opened by turning on the phototube switch, and the motor 51 which is driving the plate cylinder is used as the drive source. The counting of the pulse signal generated by the pulse generator 52 is started, and then when the check mark 15 of the 7F12 plate cylinder 1b is detected by the sensor 6b, the gate of the pulse processing unit 50 is closed by the phototube switch and the counting is started. Stop [7. The count data during that time is stored in the current value register 53, and on the other hand, the data preset by the digital switch 54 is stored in the command value register 55, and compared with the data in the current value register, the result is (Correction amount) is input to the pulse motor drive circuit as a command nozzle, and the signal from the drive circuit drives the nozzle motor x9, which is the drive device of the plate cylinder circumferential direction correction device described later.
-t le.

The amount of axial correction of the plate cylinder is determined as described above, but specifically, by replacing the distance with the pulse signal generated by the nozzle generator, as shown in Fig. 9, one buoy is used as a reference. −.

Distance d of the check mark on cylinder 11 and distance d' g of the check mark on each plate cylinder below A2
The error with a' e "' is calculated as the correction amount. The circuit that embodies this is shown in Fig. 7, where the sensor 61, which is a phototube switch, detects the vertical line 15' of the check mark on the A1 plate cylinder/-11. Then, the gate of the reference register 56 opens and starts counting the noggle signal generated by the drive source of the motor 51 driving the plate cylinder and the Surnosol generator 52, and then the sensor 61 starts counting. When the slope line 15N of the check mark is detected, the gate of the reference register 56 is closed to stop counting, and the count data during that time is memorized as a reference value.Next, the vertical line of each check mark of JI2 to A4I2-to cylinders is 15' and the vertical line 15' of the check mark on the cliff 1 plate cylinder manually (confirm the matching status with each sensor 61 to 6d), and then do the same as in the case of the 1 plate cylinder to each plate 12 and below. The count data of the vertical line 15'-inclined line 15I of the cylinder is stored in each register 57 below 711L2.
, 58, and 59, the data in the reference register 56 is compared with the data in the registers 57, 58, and 59 of each plate cylinder below A2 in response to the correction start signal, and the result (correction il) is used to drive the pulse motor. This is a drive device for a plate cylinder axial direction correction device, which will be described later, by inputting a command to the circuit as a pulse, and using a signal from the drive circuit. Control the system motor 32.

FIG. 8 is a sectional view showing a specific example of the plate cylinder circumferential direction correction device and the axial direction correction device, and FIG. 9 is a view taken along the line AA in FIG. 8.

Plate cylinder circumferential direction correction device, frame 14
The motor (drive device f4 disposed in the base 18) is supported via the support rod 16 and the support rod/guy P (hereinafter referred to as the guide) 17 and 17'. :, U noggle motor locking pinion 2
0, a gear 21 that engages with the pinion, a shaft 22 that locks the gear, and a motor sheath 1 that is locked at one end of the shaft.
A Zeel screw 24 is engaged with a nut 23 that is engaged with a nut 23 that is engaged with the other end of the shaft 22 via a bearing 44,
A slide plate 25 that is guided by the guide holes 17, 17' and is movable in parallel, and a spline shaft portion 27' that engages with the slide plate via a bearing 26 and is provided on the drive shaft 27 of the plate cylinder 1. a spline sleeve 28 that is spline-fitted with the spline sleeve, a helical gear 29 that is engaged with the spline sleeve, and a drive shaft 30 of the blanket cylinder 4 that is engaged with the helical gear.
The helical gear 31 is engaged with the helical gear 31. still,
29' is a ring gear arranged out of phase with the helical gear 29 in order to eliminate the notch clash between the helical ears 29 and 31. Further, 28' is a spline collar disposed out of phase with the spline sleeve 28 in order to eliminate knot lash between the spline sleeve 28 and the spline shaft portion 27'.

The movement of the plate cylinder in the circumferential direction by the above-mentioned correction device is performed by driving the no.
1, the shaft 22 is rotated, and the shaft 2
2 is set according to the rotation direction of the pulse motor 19)
The slide plate 25 is moved forward and backward in the axial direction by the shaft 24, and the slide plate 25 is moved forward and backward in the axial direction by the shaft 22.
17', the spline sleeve 28 moves in the direction of the plate cylinder drive shaft 27, and the movement of the spline sleeve also moves the helical gear 29. An axial displacement occurs between the helical gear 29 and the helical gear 31, and the axial displacement causes a circumferential displacement due to the helix angle, causing the helical gear 29 to rotate, and the rotation of the helical ear to A plate cylinder drive shaft is reached via the spline sleeve 28 and the spline shaft portion 27', and the plate cylinder 1 is moved in the circumferential direction.

The plate cylinder axial direction correction device has a pulse motor 32 which is a drive device connected to the motor sheath 18 shared with the circumferential direction correction device, a pinion 33 locked to the pulse motor, and a pinion 33 engaged with the pinion. A gear 34 that locks the gear, a shaft 35 that locks the gear and has one end slidably supported by the frame 14, a nut 36 that locks the other end of the shaft and locks the motor pace 18, and a screw. Matching Zeel screw 3
7 and is engaged with the shaft 35 via a bearing 37.

In addition, there is a holder 39 that can be moved in parallel while being guided by guide holes 38 installed in the frame 14, and two pairs of rotatable cams 7 and lowers 40 (in FIG. 8, a pair of cam followers) provided on the holder. (Although only the cam follower is visible, as shown in Fig. 9, there is another pair installed parallel to this at the back.) and the plate 4 held by the cam follower.
3, and a sleeve 42 which is fixed to the plate 43 and has an eccentrically bored inner diameter portion into which the drive shaft 27 of the plate cylinder 1 is fitted via a bearing 41.

Incidentally, the plate 43 is linked to 1 cylinder/-60 as shown in FIG.
The nuclear plate 43 and the sleeve 42 are rotated,
Due to the rotation of the sleeve 42, the plate cylinder drive shaft 27 is eccentric, and the plate cylinder 1 is separated from the blanket cylinder 4.

The axial movement of the plate cylinder by the correction device is performed by the pulse motor 32 according to a signal from the arithmetic and control device.
is driven, the shaft 35 is rotated via the pinion 33 and the gear 34, and the shaft 35 is moved forward and backward in the axial direction by the Zeel screw 37 according to the rotation direction of the Nogles motor 32. The holder 39 is guided by the guide A3B and moves in parallel due to the axial movement of the cam follower 40.
The plate 43 moves in parallel through the plate 43, and the plate cylinder drive shaft 27 moves through the sleeve 42 due to the parallel movement of the plate, thereby moving the plate cylinder 1 in the axial direction.

Both of the above-mentioned correction devices are provided in each plate cylinder, and each movement can be performed regardless of whether the plate cylinder or blanket cylinder is rotating or stopped.

The above describes a specific example in which the present invention is applied to a four-color halftone dot printing machine for the outer surface of a can body.1 The present invention is a multicolor printing function of two or more colors in which ink is transferred from a plate cylinder to a blanket cylinder. .

[Brief explanation of drawings]

Figure 1 is a schematic front view of a four-color dot printing machine to which the present invention is applied, Figure 2 is an explanatory diagram showing only the main parts of Figure 1, and Figures 3 (a) and (b) are registers. Explanation of check mark for alignment M1 Figures 4 to 7 show specific examples of arithmetic and control devices.
Figure 4 is a diagram explaining the principle for determining the amount of correction in the circumferential direction of the plate cylinder, Figure 5 is a block diagram of the calculation control circuit for the amount of correction in the circumferential direction of the plate cylinder, and Figure 6 is the amount of correction in the axial direction of the plate cylinder. Fig. 7 is a block diagram of the arithmetic control circuit for the axial correction amount of the plate cylinder, and Fig. 8 is a sectional view showing a specific example of the plate cylinder circumferential direction correction device and the axial direction correction device. , Figure 9 is Figure 8A
-A arrow view. In the figure, 1a to 1d are mu 1-44 plate cylinders, 2a to 2
d is a dot plate, 3a to 3d are ink stations, 4.4
' is a blanket cylinder, 5゜5I is a blanket, 6a to 6d are sensors, 7 is a mantonir wheel, 8
1 is a mandrel, 9 is a can body, 10 is a can body supply device, 11 is a finishing varnish coating roll, 12 is a can body transfer device, 13 is a no-can sensor, 14 is a frame, 15 is a check mark for registration, 151 is a registration device The vertical line of the check mark for 15#t'i registration, and the slanted line of the check mark for 15#t'i registration. 16 is the support rod % 17. 17' is the guide / % 18 is the motor base, 19 is the nozzle motor, 2OR pinion, 21 is the gear, 22 is the shaft, and 23 is the nut. 24 is an i-le screw, 25 is a slide plate, 26 is a bearing, 27 is a plate cylinder drive shaft, 27!
is the same suzo 2-in shaft part, 28 is the spline sleeve, 28
' is a spline collar, 29 is a helical ear, 29' is a ring gear, 30 is a blanket cylinder drive shaft, 3
1 is a helical gear, 32 is a pulse motor, 33 is a pinion, 34 is a gear, 35 is a shaft, 36 is a nut, 37 is a Dahl screw, 38 is a guy P number, 139 is a holder, 40
cam follower, 41 is a bearing, 42 is a sleeve, 43 is a plate, 44 is a bearing, 50 is a /e rus processing unit, 51 is a plate cylinder/-11+? + motor, 52 is the generator, 53 is the current value.
54 is a digital switch, 55 is a command value register, 56 is a reference register, 57 to 59 are registers 2 to A4, and 60 is a cylinder. Agent Patent Attorney Masanobu Akizawa 2 persons

Claims (1)

[Claims] (1) One or more blanket cylinders that make rolling contact with the outer circumferential surface of the cylindrical article body and transfer ink to the outer circumferential surface, and two or more plate cylinders that transfer printing plate ink to the blanket cylinders. In a multicolor printing machine for the outer surface of a cylindrical article body, the machine is equipped with: A check mark for registration is provided on the surface of each plate cylinder. A sensor that detects and reacts to the check mark is provided close to each plate cylinder, and a plate cylinder circumferential direction correction device that is driven by a drive device to move the plate cylinder in the circumferential direction is provided on the plate cylinder. that the plate cylinder is provided with a plate cylinder axial correction device driven by a drive device to move the plate cylinder in the axial direction; based on the detection of the check mark by the sensor! to calculate correction amounts in the circumferential direction and axial direction of the plate cylinder, and control each driving device of the circumferential direction correction device and the axial direction correction device of the plate cylinder 6 on the basis of the calculated correction amounts. An automatic registration device for a multicolor printing machine for the outer surface of a cylindrical article body, characterized in that it is equipped with an arithmetic and control device.