JPH0558278U - Impressor of sheet-fed printing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To effectively reduce damage to the impression cylinder during abnormal conditions and facilitate recovery work. [Structure] A metal plate 22 that is softer than the cylinder material is wound around the former impression cylinder body 21, and a metal plate 2 that is harder than the cylinder material is wound around the latter impression cylinder body.
2 is wound so that in the event of an abnormality, it can be recovered by replacing only the soft metal plate 22.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an impression cylinder of a sheet-fed printing machine.

[0002]

[Prior Art]

 As shown in FIG. 5, in the sheet-fed printing machine, in addition to the vertical cylinder array including the plate cylinder 1, the blanket cylinder 2 and the impression cylinder 3 for performing multicolor printing on the surface of the paper, There is one in which a horizontal cylinder arrangement including a plate cylinder 4, a blanket cylinder 5 and an impression cylinder 6 for performing one-color printing is added.

According to this, the paper whose one side is printed on the back side by the horizontal cylinder arrangement and the inking device 7 is directly passed between the impression cylinder 3 and the impression cylinder 6 and sent to the vertical cylinder arrangement and the inking device 10. , Which gives multi-color printing on the surface.

At this time, it is possible to prevent printing of the back surface from being transferred to the front surface of the impression cylinder 3 by applying printing pressure between the impression cylinder 3 and the blanket cylinder 2 in the subsequent stage on the paper on which the back surface is printed. For this purpose, a dryer 12 for drying the back side print on the former impression cylinder 6 is arranged below the horizontal cylinder arrangement.

In FIG. 5, 8 and 9 are transfer cylinders, and 11 is a stay.

[0006]

[Problems to be solved by the device]

 By the way, in a normal sheet-fed printing press, in which paper is passed from the former impression cylinder to the latter impression cylinder, the printing is not performed on the latter, so the effective surface area between the impression cylinder and the latter is reduced. Can be wide.

However, in the above-described sheet-fed printing press that transfers paper between the impression cylinders, printing is performed by both impression cylinders, so that the mutual effective surface clearance is extremely small.

Therefore, when two or more sheets of paper are clamped at the same time, when they are clamped, or when a foreign object enters the machine, both of the impression cylinders are seriously damaged and restored. There was a problem that it took a lot of work such as replacing the cylinder.

As a countermeasure against this, it is conceivable to widen the gap between the impression cylinders. With this, as shown in FIG. 6, the claw base 13 and the claws 14 in the former impression cylinder 6 and the latter impression cylinder 3 are provided. Due to the positional deviation between the nail base 15 and the nail 16 in the paper, the paper 17 is bent (wavy) and is replaced, and printing is performed in this state, resulting in a print defect.

For this reason, as shown in FIG. 7, for example, if the claw base 13 of the former impression cylinder 6 is set high to widen the gap between the impression cylinders, the pressures of the blanket cylinder 5 and the impression cylinder 6 are reduced. Since the printing is performed over the paper, the paper may be broken (may be torn) in the gap between the protruding height of the nail stand and the effective surface of the cylinder, and the printed matter may be defective.

Therefore, as in the device previously proposed by the applicant in Japanese Patent Application No. 2-31875, the impression cylinder is used for the purpose of protecting the packing sheet for adjusting the printing pressure in the impression cylinder of the intaglio or letterpress printing machine. By using a rubber sheet wound around, the above-mentioned problems can be solved.

However, in the above-described sheet-fed printing machine, as shown in FIG. 5, since a dryer is provided in the vicinity of the former impression cylinder, when a rubber or resin sheet is wound on the impression cylinder surface, The sheet is deformed and deteriorated due to heat, and printing is defective when printing is performed by applying printing pressure between the sheet and the blanket cylinder.

Of course, if the rubber sheet is wound only on the impression cylinder of the latter stage, the accuracy of the multicolor printing will be deteriorated and the printing will be defective.

The present invention has been proposed on the basis of such an actual situation, and it is an object of the present invention to effectively reduce damage to the impression cylinder at the time of abnormality and facilitate the recovery work.

[0015]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the structure of the present invention is a sheet-fed printing machine in which paper is directly transferred between impression cylinders, and at least one of the impression cylinders is made of a softer metal than the cylinder material. It is characterized in that a plate made of metal is wound.

[0016]

[Action]

 According to the above configuration, when illegal paper or foreign matter enters between the impression cylinders, only the soft metal plate is deformed, the impression cylinder body is not damaged, and only the soft metal plate can be replaced. It will be restored.

[0017]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, in a sheet-fed printing press that directly transfers paper between an impression cylinder and an impression cylinder, the front and rear pressures are rotatably supported between both left and right frames 20. A metal plate 22 that is softer than the cylinder material (generally a casting) is wound around the former impression cylinder main body 21 of the cylinder.

As the material of the metal plate 22, an aluminum plate subjected to alumite treatment or a copper plate subjected to chrome plating is selected.

On the other hand, a metal plate that is harder than a cylinder material is wound around the not-shown post-stage impression cylinder body, but the soft metal plate 22 may be wound around.

As shown in FIGS. 3 and 4, both ends of the metal plate 22 are clamped and fixed in the notch 23 formed in the outer peripheral portion of the impression cylinder main body 21.

In the notch 23, the claw shaft 24 of the paper transport mechanism is housed by rotatably supporting both ends of the claw shaft 24 by the pans 25 at both ends of the impression cylinder. A claw base 27 for receiving a plurality of claws 26 that are fixedly mounted at predetermined intervals is fixedly mounted on the side surface of the notch 23 via a stepped bar 28.

That is, the stepped bar 28 is coupled to the upward stepped portion 23 a formed on the side surface of the notch 23 with a bolt 29, and an L-shaped claw stand 27 is provided above the stepped portion of the stepped bar 28. Are joined by screws 30.

The pawl shaft 24 is rotationally driven in synchronization with mechanical rotation by a cam (not shown) with which a torsion bar 31 penetrating the inside of the pawl shaft 24 and a cam follower 32 fixed to the shaft end thereof engage. 26 is opened and closed.

One end of the metal plate 22 is bent along the side surface of the cutout 23 and is sandwiched between the metal plate 22 and the stepped bar 28. At, the bolt 33 is tightened and fixed to the impression cylinder main body 21.

On the other hand, the other end of the metal plate 22 is pinched and fixed to a pair of upper and lower flat bars 35 which are screwed together and are placed on the bottom surface of the notch 23.

The flat bar 35 is positioned by a plate-like holder 37 having a hook-shaped cross section, which is joined to the bottom surface of the notch 23 through a long hole (not shown).

Further, the fixing position of the holder 37 can be adjusted by screwing with a bolt 40 between a block 39 and a plurality of bolts 38 coupled to the bottom surface of the notch 23 along the holder 37. Has become. Reference numeral 41 in FIG. 3 is the screw hole.

Therefore, in winding the metal plate 22, first, one end is connected to the side surface of the notch 23 with the bolt 33 through the stepped bar 28, and then the other end of the metal plate 22 is preliminarily held and fixed. The flat bar 35 is hooked and fixed to the holder 37 temporarily fixed to the bottom surface of the notch 23, then the bolt 40 is screwed into the holder 37 from the block 39 side to pull the metal plate 22, and finally the bolt 36. The holder 37 may be clamped and fixed to the bottom surface of the notch 23.

A metal plate wound around a not-shown latter-stage impression cylinder body is also wound in the same manner as described above.

As described above, in this embodiment, the metal plate 22 which is softer than the cylinder material is wound around the pressure drum body 21 in the front stage, and the metal plate which is harder than the cylinder material is wound in the pressure drum body in the rear stage. Since it is wound, when the wrong paper or foreign matter enters between both impression cylinders, the soft metal plate 22 is deformed and the former impression cylinder body 21 is not damaged.

As a result, it is possible to recover by replacing only the soft metal plate 22, and the work is facilitated.

Of course, when the metal plate 22 which is softer than the cylinder material is also wound around the impression cylinder main body in the subsequent stage, it may be replaced by the above-mentioned deformation.

In the above embodiment, the material of the metal plates wound around the main body of the front and rear impression cylinders may be reversed, and one of the impression cylinders may be made of a soft metal plate. It goes without saying that the same effect can be obtained by winding the.

[0034]

[Effect of the device]

 As described above, according to the present invention, the metal plate is wound around the front and rear impression cylinders, and one of the metal plates is softer than the cylinder material. This has the effect of reducing damage to the torso and facilitating recovery work.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is likewise an enlarged side view of a main part.

FIG. 4 is likewise an enlarged cross-sectional view of a main part.

FIG. 5 is a schematic side view of a conventional example.

FIG. 6 is an explanatory diagram of an example in which a gap between impression cylinders is widened.

FIG. 7 is an explanatory diagram of an example in which a nail base is raised.

[Explanation of symbols]

 21 Impressor body 22 Metal plate 23 Notch

Claims (1)

[Scope of utility model registration request] 1. A sheet-fed printing machine in which paper is directly passed between impression cylinders, wherein a metal plate softer than a cylinder material is wound around at least one of the impression cylinders. An impression cylinder for a sheet-fed printing machine.