JPH0530919Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an offset printing machine that prints by transferring ink transferred from a plate cylinder to a transfer cylinder to a printing material. A plurality of plate cylinders are provided, and the main plate cylinder always transfers ink of the same plate to the transfer cylinder, and the sub-plate cylinder transfers ink of a different plate every time the transfer cylinder rotates. This invention relates to an offset printing machine that can perform different types of printing.

[Conventional technology]

With conventional offset printing machines, if a part of the printing is different each time the printing material is printed, two
A number of printing machines and a number of printing cylinders were prepared, and one printing machine would print a predetermined number of prints, and the other printing machine would print again, changing the printing cylinders for each printing.

In addition, in order to print continuous numbers such as metric numbers on long objects such as pipes, a plate is formed on the circumferential surface of one plate cylinder, and a number is printed on a part of the plate cylinder every rotation of the plate cylinder. There is a known technique in which a variable serial number printing device is fitted and the printing cylinder and transfer cylinder are kept in constant contact and rotated in the same phase to continuously print serial numbers (Japanese Patent Laid-Open No. 59-123668). Public bulletin).

[The problem that the idea aims to solve]

Of the above-mentioned conventional techniques, the former requires not only two printing machines and a large number of plate cylinders, but also requires the trouble of performing multiple printings.

In addition, the latter had the disadvantage that only extremely small numbers could be printed as a different type of printing, other characters or designs could not be printed in the divided areas, and the sub-divided areas could not be used effectively for printing.

In this invention, a plurality of plate cylinders are provided for one transfer cylinder, and the same plate of ink is always transferred from the main plate cylinder to the transfer cylinder, and a number of different plates are formed on the circumferential surface of the sub-plate cylinder. It is an object of the present invention to provide an offset printing machine capable of performing different printing each time the transfer cylinder rotates by transferring ink of a different plate from the sub-plate cylinder each time the transfer cylinder rotates.

[Means to solve the problem]

The feature of this invention is that the plate cylinder is composed of a main plate cylinder and a sub-plate cylinder, the main plate cylinder is always in contact with the transfer cylinder, and the sub-plate cylinder is provided with a gap between it and the transfer cylinder. At the same time, the circumferential length of the sub-plate cylinder is made different from the circumferential length of the transfer cylinder, and the circumference of the sub-plate cylinder is divided into a number of plate areas at a constant pitch, and each plate area is different. forming a plate, forming a partial transfer surface on a part of the transfer cylinder to transfer the ink of the plate in one section of the sub-plate cylinder, and moving the partial transfer surface toward the outside in the radial direction of the transfer cylinder. The main plate cylinder and the transfer cylinder are rotated at the same circumferential speed, and the sub-plate cylinder is rotated at a constant speed with different rotational angular velocities relative to the transfer cylinder, so that different printing is performed each time the transfer cylinder rotates. The point is that it is configured so that it can be done.

[Effect]

Since the main plate cylinder and the transfer cylinder are always in contact with each other, the ink of the plate on the main plate cylinder is transferred to the transfer cylinder as it rotates, while the ink of the plate on the sub-plate cylinder is transferred in the radial direction of a part of the transfer cylinder. When the partial transfer surface configured to move outwardly and retractably approaches the sub-plate cylinder, the partial transfer surface protrudes and comes into contact with the sub-plate cylinder, and due to this contact, the ink of the plate formed in the divided area is transferred. is transferred to the partial transfer surface. When this transfer is completed, the partial transfer surface returns to its original position, and as the transfer cylinder rotates, printing is performed on the printing material.

The main plate cylinder and the transfer cylinder rotate at the same circumferential speed, and the circumferential length of the sub plate cylinder and the transfer cylinder are different, and the sub plate cylinder rotates at a different rotational angular velocity with respect to the transfer cylinder. The transfer cylinder rotates at a constant speed and rotates with a constant phase difference each time the transfer cylinder rotates, and each time the transfer cylinder rotates, ink from different divided areas of the plate is transferred to the partial transfer surface. Sequentially perform partially different printing.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 designates a gravure offset printing machine which applies ink to a gravure main plate cylinder 4 and a gravure sub-plate cylinder 5 using inking devices 2 and 3, and transfers the ink to a transfer cylinder 6, and then prints on a printing material 7.

The printing material 7 may be a material that can be printed on a flat surface such as a steel band, an angle material, or a tape, or a material that can be printed on a curved surface such as a pipe, hose, or electric wire cable, and the material may be paper, wood, etc. Any printable material such as metal, synthetic resin, etc. may be used. The printing material 7 in this embodiment is a hose made of vinyl chloride.

The impression cylinder 8 on which the hose 7 is placed is composed of a roller whose mounting surface for the hose 7 is V-shaped when viewed from the front, and is attached to a hydraulic cylinder 9 for adjusting the printing pressure.
Auxiliary roller 1 whose vertical height can be changed before and after 0
1 and 12 are installed.

The inking devices 2 and 3 include nozzles 13 and 14 that eject ink and ink scrapers 15 and 1.
6 and ink collection trays 17 and 18. At the bottom of the body 10 are an ink tank 19, an ink supply pump 20, and an ink pump motor 2.
1 is stored in the nozzles 13 and 14, and the ink in the ink tank 19 is pumped by the pump 20 by the drive of the motor 21 and connected to the transport pipe 22.
The ink is sprayed onto the circumferential surfaces of the plate cylinders 4 and 5, and the sprayed surplus ink is scraped off by scrapers 15 and 16 and sent from the ink collection trays 17 and 18 to the ink tank 19 via a return pipe 23. It is configured to be collected via the

The outer peripheral length of the main plate cylinder 4 is 1 m, and the manufacturer's name, standard product name, symbol, etc. are engraved on its outer peripheral surface, and at least a small swinging piece 24 of the transfer cylinder 6, which will be described later.
The plate surface corresponding to the transfer area of the partial transfer surface 26 formed by the outer peripheral surface of the rubber blanket 25a attached to the plate is formed to be a smooth surface.

The outer circumferential length of the sub-plate cylinder 5 is 1 m2 cm, and it is divided into 51 areas with each 2 cm in the circumferential direction being divided into 51 areas. Numbers and letters m, etc., total 3
~4 characters are engraved.

The transfer cylinder 6 is constructed by attaching a rubber blanket 25 around a wheel 27, and the outer circumferential surface of the blanket 25 is in constant contact with the outer circumferential surface of the main plate cylinder 4, and the outer circumferential surface of the sub-plate cylinder 5 is in contact with the outer circumferential surface of the main plate cylinder 4. A small gap of 0.3 to 0.5 mm is provided between the surface and the surface. The wheel body 27 of the transfer cylinder 6 consists of a wheel main body 27a and a small piece 24, and dovetail grooves parallel to the axis are formed on both sides of the small piece 24, and these dovetail grooves are connected to the wheel main body. 27a
It fits into the dovetail formed in the small piece 2.
A tension spring 28 is stretched across the wheel body 27a and the wheel body 27a.

In the figure, 29 is a roller attached to the machine body 10.
It does not come into contact with the ring body 27a, but comes into contact with a flange portion 30 that protrudes inward from the outer periphery of the small piece 24 as the transfer cylinder 6 rotates, lifting the small piece 24 radially outward and causing the outer periphery 26 of the blanket 25a attached to the small piece 24 to come into contact with the sub-plate cylinder 5.

Next, the transmission system of the printing press 1 will be explained.

31 is a motor; 32 and 33 are electromagnetic main clutch brakes and sub-clutch brakes that turn on and off the driving force of the motor 31; 34 and 35 are deceleration pulleys; 36 to 42 are protrusions wound around the respective timing pulleys It's a timing belt.

43 and 44 are pulleys fitted onto the rotating shaft of the transfer cylinder 6; the belt 39 is wound around the pulley 43;
A belt 40 is wound around the belts 5 and 46.

47 is a gear fitted to the rotating shaft of the main plate cylinder 4, and this gear 47 is connected to a gear 48 coaxial with the pulley 45.
It is meshed with. A gear 49 is loosely fitted on the shaft 50 of the pulley 46, and is meshed with a gear 52 fitted on the shaft 51 of the sub-plate cylinder 5, and is connected to an electromagnetic clutch (not shown) spline-fitted to the shaft 50. from the main clutch brake 32 side to the secondary plate cylinder 5.
The structure is such that the driving force can be connected or disconnected.

The gear 52 of the sub-plate cylinder 5 meshes with the gear 49 and also meshes with a gear 55 loosely fitted onto the shaft 54 of a pulley 53 wound around the belt 42. This gear 55 is spline-fitted onto the shaft 54. The driving force from the sub-clutch brake 33 to the sub-plate cylinder 5 can be connected/disconnected by turning on/off a fitted electromagnetic clutch (not shown).

56 is a disk fitted to the shaft 51 of the sub-plate cylinder 5, and a probe (not shown) for zero point detection is provided on the side surface of this disk 56.
are attached at equal intervals near the outer circumference of the disk 56.
51 screw holes (not shown) are drilled so that an actuator (not shown) for pressing a switch, which will be described later, can be attached to any part of the screw holes,
The screw holes are numbered from 0 to 50.
By attaching the actuator to a desired screw hole, it is possible to print continuously in units of desired length up to 50 m.

Figure 3 is an electrical circuit diagram showing the operating sequence, where S ₀ is the main switch, S ₁ and S ₂ are the switches for the motors 31 and 21 for this machine and the ink pump, respectively, and S ₃ and S ₄ are the main clutches. The push button switches _L1 and _L2 for activating and stopping the brake 32 are solenoids of the main clutch brake 32, and the relay contacts are activated by operating the relay V by operating the switch _S3 .
When V ₁ closes, relay contact V ₂ switches, demagnetizing solenoid L ₁ and energizing solenoid L ₂ to apply the brake. Conversely, when solenoid _L1 is energized, the clutch engages.

S ₅ is an a contact switch that closes by the pressure of an actuator attached to the disk 56, and closes every rotation.
The actuation timing is such that it closes after the ink of the letters on the gravure plate corresponding to the number to which the actuator is attached is transferred. S ₆ is an a-contact switch that closes every rotation of the transfer cylinder 6, and its operation timing is the same as that of switch S ₅ , such that it closes after the ink is transferred to the partial transfer surface 26 by the protrusion of the small piece 24. . The switch _S6 is preferably closed by an actuator attached to the rotating shaft of the transfer cylinder 6 or a disk attached to this shaft.

When the switches S ₀ , S ₁ , and S ₂ are turned on, the motors 31 and 21 operate, and then the push button switch S ₃ is turned on.
When pressed, the electromagnetic main clutch brake 32 is engaged, rotates in the direction of the arrow, and connects the hose 7 by 1 m.
The manufacturer name and standard product name are printed on each product, as well as the metric display.

Now, if you want to print a hose with a length of 20 m as one rod, attach the actuator to the screw hole No. 20 on the disc 56. To explain this operation, the switches S ₅ and S ₆ are closed once for each revolution of the sub-plate cylinder 5 and the transfer cylinder 6, but normally the closing timings are staggered, and printing is performed sequentially from 1 m during steady rotation. The sub-plate cylinder 5 rotates 50 times while the transfer cylinder 6 rotates 51 times, and the rotational angular velocity ratio of the sub-plate cylinder 5 and transfer cylinder 6 is 50:51, and the rotation periods of the two cylinders 5 and 6 are slightly different. As the rotation progresses, the closing timings of switches S ₅ and S ₆ approach each other, and when switch S 6 closes immediately after the 20 m character on sub-print cylinder 5 is transferred to transfer cylinder ₆ , switch S ₅ also closes at the same time. This activates the relay W and closes the relay contacts W ₁ , W ₂ , W ₃ , and the circuits 57 and 5
8 and 59 are closed, thereby relays x ₁ ,
y ₁ and z ₁ are also closed. Even if the switches S ₅ and S ₆ open and the relay W returns, the circuits 57, 58, and 59 are self-maintained. The operation of relays X, Y, and Z switches relay contact x ₂ , closes relay contact y ₂ , and opens relay z ₂ , energizing solenoids L ₄ and L ₅ and demagnetizing solenoids L ₃ and L ₆ . .

The solenoids L ₃ and L ₄ are used to operate the electromagnetic auxiliary clutch brake 33, and the brake is applied when the solenoid L ₃ is energized, and the clutch is engaged when the solenoid L ₄ is energized. The solenoid _L5 is an electromagnetic clutch for the gear 55, and the clutch is engaged when energized.

However, after completing the transcription of 20m characters, relay
Y and Z operate, and the power from the main clutch brake 32 side to the sub-plate cylinder 5 is cut off, while the gear 5
5 and the auxiliary clutch brake 33 are engaged, and the auxiliary plate cylinder 5 rotates at twice the speed. During this rotation, when the switch _S7 is operated by the contact for zero point detection attached to the disk 56, the relay X is reset, the brake is applied, and the sub-plate cylinder 5 is stopped. The transfer cylinder 6, on which the 20 m characters have been transferred onto the other partial transfer surface 26, rotates together with the main plate cylinder 4 to continue printing.

The sub-plate cylinder 5 is designed to stop at the zero point at least one section before the position where the zero point of the plate is transferred to the partial transfer surface 26, and the partial transfer surface 26 of the transfer cylinder 6 is located at the zero point of the sub-plate cylinder 5. When the position coincides with that, the switches S ₈ and S ₉ are operated by the actuator on the transfer cylinder 6 side, and the clutch of the gear 55 is disengaged.At the same time, the clutch of the gear 49 is engaged, and the sub-plate cylinder 5 rotates. , again the main plate cylinder 4, sub plate cylinder 5 and transfer cylinder 6 are interlocked to move 1 m,
2m and sequentially up to 20m are printed with different characters.

Further, when an actuator attached to the screw hole of the disk is not attached, printing can be performed continuously without the sub-plate cylinder 5 returning to the zero point.

[Another embodiment] In the above embodiment, the zero point return command switch is constituted by switches _S5 and _S6 , but it is also possible to use one switch for the zero point return command and measure the number of rotations of the transfer cylinder 6 (the length of one rod of the pipe) with a reset counter so that the zero point return command switch is closed at a desired number of rotations (for example, 20 rotations).

A gear 49 is non-rotatably attached to the shaft 50 in FIG. 1, and a clutch provided on the shaft 50, a drive system on the auxiliary clutch brake 33 side, switches S ₅ , S ₆ , and a relay W in FIG.
The following circuits may be omitted.

The sub-print cylinder 5 may have fewer or more sections than 51 sections. At this time, it goes without saying that the length of the segmented transfer surface should be determined according to the segment length. Further, the diameter of the sub-plate cylinder 5 may be smaller than the diameter of the transfer cylinder 6.

The plate cylinders 4 and 5, or any one of them, may be made of letterpress, but in the case of letterpress, the transfer of ink is not as complete as in the case of gravure plates, so at least the sub-plate cylinder 5 on which printed characters change is made of gravure. If a wheel is used or the sub-print cylinder 5 is made of a relief plate, it is desirable to separately remove the ink remaining on the partial transfer surface after the ink on the partial transfer surface is transferred to the printing material.

The characters on the plate cylinder 5 are not limited to metric display, and for example, trademarks such as English letters, kanji characters, kana characters, etc. may be printed alternately. The printed plates may be transferred one by one to the transfer area of the transfer cylinder 6 while being shifted one by one, and as long as this relationship is maintained, the diameters of the plate cylinder 5 and the transfer cylinder 6 may be determined to desired diameters.

[Effect of idea]

According to the present invention, the main plate cylinder and the transfer cylinder rotate at the same circumferential speed while always being in contact with each other, and as the main plate cylinder rotates, ink from a certain plate of the main plate cylinder is transferred to the transfer cylinder, and the ink of a certain plate of the main plate cylinder is transferred to the transfer cylinder. The circumferential length of the plate cylinder is different from the circumferential length of the transfer cylinder, and the sub-plate cylinder rotates with a constant phase difference with respect to the transfer cylinder each time the transfer cylinder rotates. Ink of different plates is transferred to the partial transfer surface of the transfer cylinder, and as a whole, different printing can be performed sequentially every rotation of the transfer cylinder.

Then, a different plate is formed in each divided area on the circumferential surface of the sub-plate cylinder, and the ink of the plate formed on the circumferential surface of the sub-plate cylinder is transferred to the transfer cylinder together with the ink of the plate of the main plate cylinder. Different printing is performed as the cylinder rotates, so by effectively utilizing the divided plate areas and forming different characters and designs in each plate area, one rotation of the transfer cylinder is possible. Not only numbers but also desired characters and designs can be printed on each item.

[Brief explanation of the drawing]

The drawings show an embodiment of the offset printing press of the present invention, in which FIG. 1 is a side view with the lower part exposed, FIG. 2 is a sectional view of the main part of the transfer cylinder, and FIG. 3 is a circuit diagram. 5 is a plate cylinder, 6 is a transfer cylinder, and 26 is a partial transfer surface.

Claims (1)

[Scope of utility model registration request] This is an offset printing machine that prints by transferring ink transferred from a plate cylinder to a transfer cylinder 6 onto a printing material, and the plate cylinder is composed of a main plate cylinder 4 and a sub-plate cylinder 5, and the main plate cylinder 4 is a transfer cylinder. 6, and the other auxiliary plate cylinder 5 is arranged with a gap between it and the transfer cylinder 6, and the circumferential length of the auxiliary plate cylinder 5 and the circumferential length of the transfer cylinder 6 are made different. In addition, the area around the sub-plate cylinder 5 is divided into a large number of plate areas at a constant pitch, and a different plate is formed for each plate area, and a part of the transfer cylinder 6 is divided into a number of plate areas at a constant pitch. Partial transfer surface 26 for transferring ink
The partial transfer surface 26 is configured to be able to move forward and backward in the radial direction of the transfer cylinder 6, and the main plate cylinder 4 and the transfer cylinder 6 are rotated at the same circumferential speed. An offset printing machine characterized in that it is configured to rotate at a constant speed with respect to a transfer cylinder 6 at different rotational angular velocities so that different printing can be performed each time the transfer cylinder 6 rotates once.