JPS63115749A - Printer - Google Patents

Abstract

PURPOSE:To shorten the switching time of printing work, by stopping or enabling independent operation of other printing units when a paper feed unit, at least one printing unit and a paper discharge unit are under operating condition without hindering the latter units. CONSTITUTION:An impression cylinder 19 is made rotatable irrespective of transmission of power by providing a bearing 16 between the impression cylinder 19 and a gear 23 for driving said cylinder 19, whereby a brancket cylinder 20 and a form cylinder 21 can be stopped or driven independently by means of a drive motor 18 without causing trouble in the flow of printing medium with respect a random printing unit. With such an arrangement, replacement of form plate and cleaning of brancket 20 are enabled with respect to a printing unit which does not concern to printing during operation of a printer body. Furthermore, clutches 14, 24 are disengaged and a clutch 25 is engaged so as to enable independent rotation of an inking roll 22. Consequently, the inking roll 22 can be cleaned and new ink can be fed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a continuous printing device that can drastically reduce the switching time in the printing process in a printing press and can print continuously.

[Prior Art] As shown in FIG. 3, a conventional rotary printing press has a paper feeding unit 2 that fixes a rolled printing medium 1 and supplies the printing medium and a roller that supplies ink. A plurality of units consisting of a plate cylinder 4 on which printing plates are mounted in a group and an impression cylinder that nip and press the printing medium between the printing cylinder (plate cylinder, blanket cylinder) and transfer ink to the printing medium. It has printing units 5a to 5d, and further includes a discharge unit 6 that winds up or folds the printing medium into a roll and discharges it. In addition, the printing medium has a processing unit 7 (air punch, marginal punch, horizontal perforation) for perforating and perforating the printing medium.

When switching printing operations on such a rotary printing press, the operation of the printing press must be completely stopped at the end of the previous printing operation, and the paper feed unit must be used to replace the printing medium,
The printing unit collects the ink used in the previous work, cleans the inking roller, replaces the printing plate, supplies new ink, corrects the processing width if it has a processing section, replaces the processing blade, etc., and the paper ejection unit performs folding. If you count in detail, there are dozens of assembly tasks, such as setting up a device or winding device, and then you have to do several dozen assembly tasks one after the other, and even after printing has started, you have to adjust the printing register, and if you also need to do processing, you have to do the same thing as the processing. Several hours of changeover time is required from the end of the previous printing job to the start of the next printing job, such as adjusting mutual register, which is the biggest cause of low operating rates of printing presses.

[Purpose] By the way, the drive structure of a typical rotary printing press, as shown in FIG. 1
Although a clutch 13 is also provided, it is not possible to disconnect the transmission path of the motive force to any part of the cylinder I2.

In addition, in a printing press, since the printing medium is guided while being wrapped around the impression cylinder (see printing units 5a to 5d in Fig. 3), it is possible to simply stop the power transmission to the cylinder 12 and remove the printing medium from the impression cylinder. If the impression cylinder stops rotating, paper feeding will become abnormal, causing problems with printing in other areas.

In view of the above points, the present invention has been devised to stop other printing units in a rotary printing press, when a paper feeding unit, at least one printing unit, and a paper ejection unit are in operation, without any hindrance to the operation of these units. Or, by using a structure that allows independent operation, the switching work for the printing unit for the next work can be completed during operation, drastically reducing the switching time of printing work, and printing can be performed continuously. The purpose is to provide a machine.

[composition] Hereinafter, the printing press of the present invention will be explained according to examples.

The embodiment shows a case where the functions of the present invention are added to an offset form rotary printing press that prints continuous forms.

FIG. 1 is a diagram showing a drive system of a printing press according to the present invention, in which a driving shaft 10 to which power is transmitted by a driving motor (not shown) is shown.
A driving clutch 14 is provided in the middle of transmitting power to each printing section via each bevel gear 11 so that the power transmission path can be disconnected, and the impression cylinder shaft 15 is connected to the bearing 1.
6, it is rotatably supported. The power transmission path after this driving clutch 14 connects printing cylinders such as an impression cylinder 19, a blanket cylinder 20, a plate cylinder 21, etc. via a differential mechanism 17 for adjusting the printing register and a drive motor 18 that moves the differential mechanism 17. It is divided into one that drives the inking roll system 22 and one that drives the inking roll system 22. If the drive clutch 14 is disengaged at this point, the power transmission path is completely cut off, so none of the rolls or cylinders in that printing unit will rotate, but as mentioned above, the impression cylinder 19 through which the paper passes can rotate. In order to accomplish this, a bearing 16 is provided between the impression cylinder 19 and the gear 23 that drives it, so that the impression cylinder 19 can rotate regardless of whether or not power is transmitted. . This structure allows the blanket cylinder 20 and the plate cylinder 21 to be stopped or to be driven independently by the drive motor 18 without interfering with the flow of the printing medium for unspecified printing units. In Figure 3, the code 5c
, 5d, the printing cylinder of the printing unit is displaced to the right and spaced apart from the impression cylinder). This structure allows plates to be replaced and blankets to be cleaned for printing units that are not involved in printing while the printing machine is in operation.

Furthermore, regarding the drive system of the inking roll on the other side of the power transmission path, the drive clutch 14 isolates the power from the drive shaft 10, and by disengaging the inking roll clutch 24, it is also isolated from the power from the drive motor 18. and completely cut off the power transmission path. At this point, the clutch 25 is engaged so that the inking roll 22 can be rotated independently by the independent drive motor 26. This structure makes it possible to clean the inking roll and supply an appropriate amount of new ink to the inking roll. However, the condition is that the ON and OFF states of the clutch 25 and the clutch 24 are contradictory.

In addition, in the case of form rotary printing presses, because the finished size of printed matter is wide-ranging, many of them have interchangeable printing cylinders to accommodate this.The present invention can be applied to such printing presses. When applied, a method may be adopted in which only the impression cylinder is left in the main printing machine and the other printing cylinders are replaced. In particular, in the case of an offset printing press, as shown in FIG. 2, a two-cylinder exchange system is used in which a blanket cylinder 20 and a plate cylinder 21 are exchangeable cylinders. In this case, if the exchange cylinder 27 and the impression cylinder 19 are physically separated, the driving clutch 14 used in FIG.
There is no need to provide an inking roll, etc., and the same structure may be used. However, the blanket cylinder 20 and plate cylinder 2 of the exchange cylinder 27
1 and a mechanism that prevents the exchange cylinder 27 from coming into contact with the rotating impression cylinder 19 during operation.

[Effect] If you use a printing machine equipped with multiple printing units having the structure described above, when the paper feeding device, at least one printing unit, and ejecting device of the printing machine are in operation, other printers can You can change plates, clean blankets, clean ink rolls, clean ink fountains, etc. without disrupting the operation of the printing department.
You can complete the work up to the supply of new ink,
Printing machine cutting time can be greatly reduced.

Furthermore, a method has been reported that uses an electronic control system to initially adjust the printing register and processing register, but if this method is adopted in the printing press of the present invention, the time saved will be dramatically reduced and the changeover work will be reduced. There is little need to do anything other than replacing the printing medium, resulting in a printing device that can be operated almost continuously.

[Brief explanation of the drawing]

1 and 2 are diagrams showing the drive mechanism of the printing section in the present invention, and FIG. 3 is a schematic diagram showing the overall configuration of the rotary printing press.
FIG. 4 is a diagram showing a general driving mechanism of a printing press. 1...Print medium, 2...Paper feeding unit,
5a, 5b, 5c, 5d - printing unit, 6.
...Discharge unit, 7. ...Processing unit, 8.
...Driving motor, 10...Driving shaft, 11...
...Bevel gear, 14...Clutch, 15...
...impression cylinder shaft, 16...bearing, 17...
Differential mechanism, 18... Drive motor, 19...
・Impression cylinder, 20... Blanket cylinder, 2
1... Plate cylinder, 22... Inking roller, 23... Gear, 24.25...
Clutch, 26... Drive motor, 27...
Exchange torso.

Claims (3)

[Claims] (1) Printing section consisting of a supply device for supplying the printing medium to the printing section, a supply section for supplying ink, a printing plate cylinder, and an impression cylinder that presses the printing medium by sandwiching it between the printing cylinders. In a printing device including a plurality of printers and a discharge device for discharging a printing medium, the impression cylinder can be rotated regardless of whether or not power is transmitted, so that at least one of the supply device and the printing section can A printing device characterized by a structure that allows plates to be exchanged in other printing sections without interfering with the operation of the discharge device when it is in operation. (2) A clutch is provided between the gear train of each printing unit and the driving shaft that drives them, and the impression cylinder shaft is supported by a bearing so as to be freely rotatable. Printing device. (3) A patent claim characterized in that an exchange cylinder consisting of a blanket cylinder and a plate cylinder can be moved into and out of contact with an impression cylinder, and the impression cylinder in an unused printing unit is also constantly rotated. The printing device according to scope 1.