JPH0345811Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an engraving roller changing device in a rotary printing press.

[Prior Art] As schematically shown in FIG. 1, a rotary printing press has a plurality of printing units 1 arranged in a straight line with appropriate intervals between adjacent units 1, and a pair of printing units 1 in each printing unit 1. Two sets of printing units 3, 3 are provided between the roller support frames 2. And this printing part 3
The lower part of the ink supply roller 5 is immersed in the ink stored in the ink fountain 4, and as the ink supply roller 5 rotates, the ink adhering to the outer peripheral surface is transferred to the engraving roller 6 that is in contact with it, and the engraving is performed. After scraping off excess ink with a doctor blade 6 brought into contact with the outer periphery of the roller 6, the ink is transferred to the outer periphery of a plate cylinder 8 via an ink transfer roller 7, and the ink is transferred to the outer periphery of a plate cylinder 8 and an impression cylinder brought into pressure contact therewith. Printing is performed on the paper that is passed between 9 and 9.

The engraving roller 6 has fine depressions all over its outer circumferential surface, and in order to supply the ink accumulated in the depressions to the ink transfer roller 7, when the outer circumferential surface of the engraving roller 6 wears, the capacity of the depressions decreases and the ink is transferred to the ink transfer roller 7. The amount of ink supplied changes, and if some parts are damaged, the ink supply will be uneven. Therefore, the engraving roller needs to be replaced when it becomes damaged or when the amount of wear increases.

By the way, conventionally, after removing the ink transfer roller 7, the roller shafts at both ends of the engraving roller are lifted up with wires.

[Problems to be solved by the invention] However, in the above-mentioned replacement, since the plate cylinder is located above the engraving roller, it is necessary to lift the engraving roller diagonally upward, which makes replacement very difficult. This method has the drawbacks of being time-consuming and requiring skilled professionals.

Therefore, the technical object of this invention is to solve the above-mentioned drawbacks and to facilitate the replacement of the engraving roller.

[Means for Solving the Problem] In order to solve the above technical problem, this invention attaches a bracket that rotatably supports the roller shaft of the engraving roller to the inner surface of a pair of roller support frames. The bearing cylinder part of the bracket is divided into two parts along the axis, and a shaft coupling for rotation transmission is provided between the roller shaft of the engraving roller supported by the bracket and the rotating shaft supported by the roller support frame. is removably provided, and below the bracket,
A roller support arm rotatable in the front-rear direction between a pair of roller support frames is provided, and a rotation drive device for the roller support arm is provided, and the roller shaft of the engraving roller is fitted into the tip of the roller support arm. A clamping block for clamping the roller shaft with the bearing groove is removably attached to the tip of the roller support arm.

[Operation] In the exchanging device configured as described above, the roller support arm is rotated, the roller shaft of the engraving roller is fitted into the bearing groove at the tip, and a clamping block is attached to the tip of the roller support arm. When the roller shaft is held between the roller shaft and the bearing groove, the bearing tube of the bracket is divided into two parts, the shaft coupling is removed, and the roller support arm is rotated, the engraving roller rotates together with the arm. Therefore, the engraving roller can be taken out between adjacent printing units, and the engraving roller can be exchanged between printing units.

[Embodiment] FIGS. 2 to 4 show an embodiment of the exchange device according to the present invention, and the same parts as those shown in FIG. 1 are given the same reference numerals and explanations are omitted.

As shown in FIG. 3, the roller shaft 10 of the engraving roller 6 includes a large-diameter shaft portion 11 and a small-diameter shaft portion 12, and a bearing 13 is press-fitted onto the outside of the large-diameter shaft portion 11.

The bearing 13 is rotatably supported by a support tube 15 of a bracket 14 attached to the inner surface of the roller support frame 2. As shown in FIG. 2, this support tube portion 15 is divided into two parts along the axis, and is detachably connected with bolts 16.

A roller shaft 10 of the engraving roller 6 rotatably supported by a bracket 14 and a rotary shaft 17 supported by the roller support frame 2 are connected by a shaft coupling 18 (see FIG. 3). This shaft joint 18
It is also divided into two parts along the axis, making it removable.

As shown in FIGS. 2 and 3, an arm support shaft 19 is provided at the lower part of the roller support frame 2, and the roller support arm 20 rotatably supported by the arm support shaft 19 is It is designed to be able to rotate between the printing units 1 and 1 shown in FIG.

Although not shown in the drawings, the roller support arms 20 are arranged below the roller shafts 10 at both ends of the engraving roller 6, and are simultaneously rotated by the same angle by a common drive device 21.

The drive device 21 may be of a manually operated type that transmits the rotation of the handle to the roller support arm 20 via a gear transmission mechanism, but here, as shown in FIG. The output shaft 2 of the reducer 23 is driven by the reducer 23.
4 is passed between a pair of roller support frames 2, and an endless chain 27 is passed between a sprocket 25 attached to the end of the output shaft 24 and a sprocket 26 provided at the end of the roller support arm 20 to drive the motor 22. The roller support arm 20 is rotated by.

The tip of the roller support arm 20 has a bearing groove 28 into which the small diameter shaft portion 12 of the roller shaft 10 can fit.
A clamping block 29 which clamps the small diameter shaft portion 12 with the bearing groove 28 is removably attached to the tip of the roller support arm 20 via a bolt 30 (see FIG. 4).

In addition, 31 shown in FIG. 2 indicates a cart movable between the adjacent printing units 1, 1, and a support groove 32 is formed on the upper surface of the cart 31 into which a part of the outer circumference of the engraving roller 6 can fit. has been done.

The exchange device shown in the embodiment has the above structure,
When replacing the engraving roller 6 using this replacement device, the ink transfer roller 7 disposed between the engraving roller 6 and the plate cylinder 8 should be removed.

Now, when the drive device 21 is activated and the roller support arm 20 is rotated toward the space between the printing units 1,
Bearing groove 2 provided at the tip of the roller support arm 20
8 fits into the small diameter shaft portion 12 of the roller shaft 10. Therefore, the drive device 21 is stopped, the clamping block 29 is bolted to the tip of the roller support arm 20, the small diameter shaft part 12 is clamped between the bearing groove 28, and then the support cylinder part 15 of the bracket 14 and the shaft coupling are clamped. 1
8 into two along the axis, and drive the drive device 21 again to separate the roller support arms 20.
By rotating in the same direction as described above, the engraving roller 6 rotates together with the roller support arm 20 about the arm support shaft 19, and the engraving roller is moved from the bracket 14 onto the carriage 31 disposed between the printing units 1, 1. 6 can be taken out, holding block 2
9, the engraving roller 6 is moved to the carriage 3.
1 can be supported.

In addition, a replacement engraving roller 6 is placed on the cart 31, and the small diameter shaft portion 12 of the roller shaft 10 is held between the bearing groove 28 of the roller support arm 20 and the holding block 29 attached to the tip of the arm 20. holding,
Then, when the drive device 21 is actuated to rotate the roller support arm 20 in the opposite direction (direction facing between the pair of roller support frames 2), the engraving roller 6
A bearing 13 attached to a large-diameter shaft portion 11 is supported by a support cylinder portion 15 that is divided into two halves of a bracket 14. Therefore, it is necessary to assemble the support cylinder part 15 into a cylinder shape, connect the rotating shaft 17 and the small diameter cylinder part 12 with the shaft coupling 18, remove the clamping block 29 from it, and rotate the roller support arm 20 slightly in the same direction. This allows a new engraving roller 6 to be installed in the printing unit 1.

[Function] As described above, according to this invention, the bearing groove provided at the tip of the roller support arm is fitted into the roller shaft of the engraving roller, and the clamping block is attached to the tip of the roller support arm. The engraving roller can be removed from the bracket by dividing the bracket's support tube into two parts, uncoupling the shaft coupling, and then rotating the roller support arm. It is extremely easy to replace, and even an amateur can easily replace it without leaving it to a professional.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a rotary printing press equipped with a changing device according to the invention, Fig. 2 is a partially cutaway front view showing the same changing device as above, and Fig. 3 is a longitudinal sectional side view of Fig. 2; FIG. 4 is a front view of the same roller support arm with the clamping block attached. 2...Roller support frame, 6...Engraving roller, 14...Bracket, 15...Support cylinder part, 1
7... Rotating shaft, 18... Shaft coupling, 20... Roller support arm, 21... Drive device, 28... Bearing groove, 29... Clamping block.

Claims (1)

[Scope of utility model registration request] A bracket that rotatably supports the roller shaft of the engraving roller is attached to the inner surface of the pair of roller support frames, and the bearing cylinder part of this bracket is divided into two parts along the axis, and the engraving supported by the bracket is A shaft coupling for rotation transmission is removably provided between the roller shaft of the roller and the rotating shaft supported by the roller support frame, and a rotary joint is provided below the bracket for rotation in the front-rear direction between the pair of roller support frames. A movable roller support arm is provided, and a rotation drive device for the roller support arm is provided, and a bearing groove into which a roller shaft of an engraving roller can be fitted is formed at the tip of the roller support arm, and the bearing groove and the roller shaft of the engraving roller are fitted. An engraving roller changing device for a rotary printing press in which a clamping block for clamping a roller shaft is detachably attached to the tip of a roller support arm.