JPS6337706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate cylinder changing device for a rotary printing press for automatically changing a plate cylinder supported by a side frame of a printing unit in the rotary printing press.

Conventionally, plate cylinders in rotary printing presses, particularly gravure printing machines, have been replaced manually or, if the plate cylinder is heavy, by using a forklift or the like.
Additionally, a device in which the plate cylinder exchange is semi-automated is being considered, but in this device, the used plate cylinder is lifted up from a notch in the side frame by a hydraulic cylinder, and then a cantilevered support attached to the side frame is used. After taking it out of the side frame while rolling the top manually, the plate cylinder supported on the support is carried out of the printing press unit using a conveyance device such as a hoist, and then the new plate cylinder is transferred to the conveyance device. Therefore, after being placed on the support, the new plate cylinder is manually rolled on the support to feed it into a predetermined position on the side frame.

However, there are problems in that two workers are required to replace the plate cylinder manually or by a forklift, and the replacement work takes a long time.

In addition, the above-mentioned semi-automated device still requires manual labor, and after the old plate cylinder is once taken out of the side frame, it is carried out of the unit by a conveying device, and then the new plate cylinder is held by the conveying device and placed on the side frame. Since it is installed at a predetermined position on the frame, there is a problem that the new plate cylinder cannot be immediately installed in the side frame after the old plate cylinder is taken out from the side frame, and the work takes time.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a plate cylinder changing device for a rotary printing press that can be automatically replaced by one worker quickly and reliably without damaging the plate cylinder.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the printing unit U
has side frames 1 and 2 provided at appropriate intervals on the left and right, and cutout portions 1a and 2 for supporting the plate cylinder 3 at the lower part of these side frames.
a is formed, and within these notches 1a and 2a,
Bearings 4 and 5 are housed to fit around shafts 3a and 3b that protrude from both ends of the plate cylinder 3.
Arc-shaped recesses S are formed in the deepest parts of the notches 1a, 2a so that the bearings 4, 5 are fixed therein.

A dryer 6 is installed between the upper parts of the side frames 1 and 2.
is held, and an eye beam is installed horizontally on the notch side of these side frames 1 and 2, this eye beam is fixed to the lower surface of the cross beam 7, and a hoist 8 is suspended from this eye beam.
The hoist 8 includes a main body 9, an air motor 10 fixed to one end of the main body 9, a support 11 suspended vertically by the air motor 10, and a main body 9 for hanging the main body 9 on an eye beam. It has hanging parts 12, 12 attached to both ends of 9. This suspension part 12 has wheels w, w, ..., w
The rotation of the wheels causes the hoist 9 to move along the eye beam that forms the travel rail.
A ring-shaped wire 1 is provided at both ends of the support body 11 for lifting the shafts 13a and 13b of the replacement plate cylinder 13.
4,15 are supported.

The main body 9 and the support 11 are connected by chains 16 and 17 located near both ends of these members, and the chains 16 and 17 are expanded and contracted by driving the air motor 10 to move the support 11 up and down. ing.

Swinging arms 18, 19 for supporting the plate cylinder 3 are swingably provided on the lower outer sides of the side frames 1, 2, and protrusions 18a, 19a are provided on the lower surfaces of the swinging arms 18, 19. The projecting portions 18a and 19a are rotatably attached to the side frames 1 and 2 by shafts 20 and 21, respectively. Levers 22 and 23 are attached to the shafts 20 and 21, and these levers 22,
23 is connected to the protrusion 18a through the shafts 20 and 21.
19a, thereby lever 2
2 and 23 are adapted to swing together with swing arms 18 and 19.

At the tips of the levers 22 and 23, there are piston shafts 26 that protrude upward from the hydraulic cylinders 24 and 25.
The upper end of the hydraulic cylinder 24,
25 is pivotally attached to the floor via fixing members 26a and 27a. On the other hand, a drive shaft 28 is rotatably provided along the floor surface and across the side frames 1 and 2, and the right end of the drive shaft 28 in FIG. 2 is connected to a drive motor 30 via a speed reducer 29. , drive shaft 28
First sprockets 31 and 32 are fixed to both ends of the sprocket. Further, the shaft 20 has a second sprocket 3 corresponding to the first sprockets 31 and 32.
3, 34 are installed, and the second sprocket 33,
A third sprocket 35, 36 is provided adjacent to the sprocket 34.

A third
A plate cylinder transfer mechanism 37 as shown in the figure is provided, and this plate cylinder transfer mechanism 37 includes an endless chain 38 that runs approximately the entire length of the swinging arms 18 and 19, and an endless chain 38 that is wound around the swinging arms 18 and 19. Fourth and fifth sprockets 39 and 40 are rotatably provided on both end sides of the movable arm, and are attached coaxially with the fifth sprocket 40.
a sixth sprocket 41 fixedly connected to the
A guide rail 42 formed elongated on the side of the swing arm to form a guide path for the endless chain 38
It is equipped with The endless chain 38 is provided with pushing members 43a and 43b arranged at appropriate intervals for pushing the plate cylinder on the swing arm, and these pushing members are connected to a base member as shown in FIG. 44 and a roller 45 attached to this base member 44, both left and right ends of the base member 44 are connected to the endless chain 38. And the first sprocket 3
A first conduction chain 46, 46 is provided between the first and second sprockets 33, 34, and a first conduction chain 46, 46 is provided between the third sprocket 35, 36 and the sixth sprocket 41, 4.
A second conductive chain 47, 47 is stretched between the two conductive chains 47, 47.

Note that a locking portion u is provided on the top surface of the tip end portion (left end portion in FIG. 3) of the swinging arms 18, 19 to lock the rolling plate cylinder 3 so that it does not fall from the top of the swinging arm. There is.

Next, the operation of the present invention will be explained.

Figures 1 and 5 show the swing arm 1 during printing.
8, and since the operations of the swing arm 18 and the swing arm 19 are the same, only the operation of the swing arm 18 will be described.

When printing is completed and the printing cylinder is to be replaced with a new one, the hydraulic cylinder 24 is extended. Then, the piston shaft 26 causes the small lever 22 to rotate clockwise in the figure. At the same time, the swing arm 18 also rotates in the same direction, and the rear part of the swing arm from the fulcrum 20 comes into contact with the shaft 3a of the plate cylinder 3 (FIG. 6). The rear part of the swinging arm 18 comes into contact with the shaft 3a a little before the swinging arm 18 reaches the horizontal position, and when the swinging arm 18 is further rotated from this position, the bearing 4 of the plate cylinder 3 is moved. It separates from the recess s of the side frame.

When the swing arm 18 becomes horizontal, the drive of the hydraulic cylinder 24 is stopped.

Next, in order to operate the plate cylinder transfer mechanism 37, the drive motor 30 on the side frame 2 side is driven, and its rotational force is transferred to the drive shaft 28, the first sprocket 31, the second sprocket 33, the third sprocket 35, and the like. It is transmitted to the endless chain 38 via each conduction chain 46, 47 wound between the sprockets. At this time, the pushing member 43a of the endless chain 38 is placed at the base of the swing arm 18 (near the sixth sprocket 41).
The pushing members 43b are located at the center of the upper travel path, and when the plate cylinder transfer mechanism 17 starts driving, the endless chain 18 rotates clockwise, and the rear pushing member 43a moves toward the plate cylinder axis. 3a, causing it to roll and move on the swinging arm to the right in the figure (FIG. 7). When the plate cylinder 3 moves to the position of the locking portion u at the tip of the swinging arm, the driving of the endless chain 38 is stopped (FIG. 8). At this time, a new plate cylinder 13 for replacement is conveyed from outside the printing unit U by a plate cylinder conveying device consisting of a hoist 8 and an eye beam forming a travel path, and is moved above the center of the swing arm 18 and is on standby. The new plate cylinder 13 is lowered together with the support 11 by driving the air motor 10, and placed on the left side of the old plate cylinder 3 as shown in FIG.

Next, the plate cylinder transfer mechanism 37 is reversed by a reversing mechanism (not shown), and the endless chain 38 is rotated counterclockwise. The pushing member 43 pushes the old plate cylinder 3 to the right due to the rotation of the endless chain 38
a comes into contact with the shaft of the new plate cylinder and pushes it to the left, that is, toward the notch 1a of the side frame 1. As the left pushing member 43a enters the notch 1a, the right pushing member 43b pushes the old plate cylinder 3 to the left, and when the old plate cylinder 3 reaches directly below the hoist, the drive of the endless chain 38 is stopped. . At this time, the new plate cylinder 13 is located in front of the recessed part s of the cutout part 1a (FIG. 10).

When the endless chain 38 stops, the old plate cylinder 3 is raised by the hoist 8 and carried out of the printing unit U. Next, the hydraulic cylinder 24 is retracted to rotate the swing arm 18 counterclockwise. Therefore, the bearing of the plate cylinder 13 fits into the recess s. Then, the endless chain 38 is rotated counterclockwise, and the pushing member 43a,
43b is moved to the position shown in FIG. 5 and stopped, the swinging arm 18 is stopped at the position shown in FIG. 5, and the swinging arm is locked to the side frame by a locking device (not shown).

In this way, if the new plate cylinder is fitted into the side frame while the old plate cylinder is placed on the swing arm, the new plate cylinder transported from outside the printing unit can be placed at the position where it is lowered from the plate cylinder conveying device. It becomes possible to grasp and carry out the old plate cylinder, the conveying device can be used efficiently, and even if the number of conveying devices is small, the plate cylinder can be replaced in a short time. Additionally, the suspended vehicle system makes effective use of space, so less space is required. Furthermore, if a limit switch or the like is provided at each location and combined with an automatic control device, plate cylinder replacement can be easily fully automated.

Since the present invention is constructed as described above, the plate cylinder can be replaced automatically, one operator is sufficient, and the replacement can be done quickly and reliably.

[Brief explanation of the drawing]

Fig. 1 is a side view of a printing unit equipped with the plate cylinder changing device of the present invention, Fig. 2 is a partial sectional view of the same printing unit, Fig. 3 is a perspective view of the swinging arm, and Fig. 4 is a push-pull unit. The perspective views of the members, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, and FIG. 11 are explanatory views of the operation of the swing arm. 1, 2... Side frame, 4, 5... Bearing, 8... Hoist, 18, 19... Swinging arm,
24, 25... Hydraulic cylinder, 37... Plate cylinder transfer mechanism, 38... Endless chain, 43a, 43b... Pushing member.

Claims (1)

[Scope of Claims] 1. In a rotary printing press in which a notch is provided in a side frame in a printing unit and a bearing of a plate cylinder is fitted into the notch, the plate cylinder can be inserted into the notch from outside the printing unit. A plate cylinder transport device is provided for transporting the plate cylinder to the vicinity of the notch and carrying the plate cylinder after printing out of the printing unit. It provides guidance for moving the old plate cylinder from the notch to the outside of the side frame, and feeding a new replacement plate cylinder from outside the side frame into the notch, and is also long enough to support two plate cylinders in parallel at the same time. and a plate cylinder transfer mechanism attached to the swing arm for horizontally rolling the plate cylinder on the swing arm when the swing arm is in a horizontal state. A plate cylinder changing device for a rotary printing press characterized by: 2. The swinging arm is pivotally mounted in such a position that when the swinging arm is in a horizontal position, the rear part of the swinging arm slightly raises the plate cylinder in the notch so that the plate cylinder can roll on the swinging arm. A plate cylinder changing device for a rotary printing press according to claim 1, characterized in that: 3. The plate cylinder transfer mechanism includes an endless chain that is attached to the side surface of the swing arm and runs along the swing arm, and two wheels that are attached to the endless chain at a predetermined interval for pushing the plate cylinder. A plate cylinder changing device for a rotary printing press according to claim 1 or 2, characterized in that it has two pushing members.