JPH0558286U - Printing cylinder / roller cleaning device for printing machines - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide an apparatus capable of eliminating the wrapping of the cleaning cloth around the printing cylinder and the roller with a simple configuration. [Structure] A bending piece 8a of a lever 8 is pressed against a cleaning cloth 6 that is intermittently traveling while being abutted against the peripheral surface of a rotating blanket cylinder 1 by a pulling force of a tension spring. Lever 8
The free end portion of the one-sided non-folded portion is opposed to the contact of the limit switch 12 to detect the loosening of the cleaning cloth 6.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a printing cylinder / roller cleaning device for cleaning printing cylinders such as a blanket cylinder, an impression cylinder, and a transfer cylinder, and peripheral surfaces of rollers such as a wearing roller and a swing roller in various printing machines.

[0002]

[Prior Art]

 Various printing machines such as an offset printing machine and an intaglio printing machine are equipped with printing cylinders such as a plate cylinder, a blanket cylinder, an impression cylinder, and a transfer cylinder, and rollers such as a forming roller and a swing roller. Since foreign matter such as ink residue and paper dust adheres to the peripheral surface of the product during printing and deteriorates the quality of the printed matter, a cleaning device is installed to clean the printing cylinder and rollers to remove these foreign matter. Has been done.

This type of printing cylinder / roller cleaning device, for example, when cleaning a blanket cylinder, extends in the axial direction in the vicinity of the peripheral surface of the blanket cylinder and axially rotatably supports both ends of the bearing of the device frame. It is equipped with a rewinding shaft and a winding shaft, and a pad made of an elastic member that can move forward and backward in the radial direction of the blanket cylinder so as to come into contact with and separate from the peripheral surface of the blanket cylinder is provided in the middle of both these shafts. It is supported by the holder. By doing so, the cleaning cloth such as the non-woven fabric wound on the rewinding shaft in a separate process is intermittently rewound and wound on the winding shaft. Since the middle part of the blanket is pressed against the peripheral surface of the blanket cylinder, foreign matter adhering to the peripheral surface of the cylinder is transferred to the cleaning cloth, carried away with the cleaning cloth, and taken up by the winding shaft. There is.

However, in such a printing cylinder / roller cleaning device, when the cleaning cloth is broken for some reason, such as sticking to the blanket surface of the blanket cylinder due to the viscosity of the ink, cleaning is performed on the rotating blanket cylinder. Since the broken end of the cloth may be caught and cause a serious accident, it is attempted to attach a rotary encoder to the end of the rewind shaft and detect the break by the change in the number of revolutions to notify the accident. However, there is a problem that it takes time between the detection of the breakage and the stop of the printing machine due to the signal, and the cleaning cloth is wound around the blanket cylinder during that time, and the structure becomes complicated. is there.

In order to solve these drawbacks, a cutter, which is almost orthogonal to the running direction of the cleaning cloth, is provided in the vicinity of the running path of the cleaning cloth, as in the device disclosed in JP-A-63-286350. If the cleaning cloth is ruptured for some reason and is wound around the blanket cylinder, or if the cleaning cloth is wrapped around the blanket cylinder due to the adhesive force of the ink without breaking, the rewind shaft and the blanket cylinder will be An apparatus has been proposed in which an accident is prevented by cutting the cleaning cloth with a cutter so that tension is applied between the cleaning cloth and the cutter. In addition, in this case, the rotation of the cutter after cutting is detected by a limit switch etc. to stop the printing machine, or the limit switch alone without a cutter detects abnormal tension of the cleaning cloth and stops the printing machine. It is proposed to prevent the occurrence of accidents by doing so.

[0006]

[Problems to be solved by the device]

 However, in such a conventional printing cylinder / roller cleaning device, when the cleaning cloth is cut by the cutter as described above, or when the cutter rotation is detected by the limit switch after cutting with the cutter, In any case where the limit switch is used for detection without providing it, there is a problem that it takes a little time to obtain the tension to cut or detect, and the loss of the cleaning cloth cannot be avoided. ..

Further, in both cases of cutting the cleaning cloth with the cutter and detecting rotation of the cutter with the limit switch after cutting with the cutter, the cleaning cloth is not broken and the viscosity of the ink changes. If the cleaning cloth is wound around the blanket cylinder, the cleaning cloth will be cut by the cutter, so the take-up shaft must be replaced, which is labor-intensive and reduces the operating rate of the machine.

Further, when the cleaning cloth is cut by the cutter, since there is no detection by the limit switch, the cutting of the cleaning cloth is not noticed, and the cutting can be known only by looking at the blanket cylinder. However, after cleaning all the printing units, only the blanket cylinder of the printing unit that had the above accident has to be cleaned again, which causes a problem that the preparation time is extended and the operation rate of the machine is reduced. .. Further, as described above, there is a problem in that the rotation of the cutter is detected by the limit switch after being cut with the cutter, because it has many components and cannot be provided at a low cost.

The present invention has been made in view of the above points, and provides a printing cylinder / roller cleaning device for a printing machine, which is capable of eliminating the wrapping of the cleaning cloth on the printing cylinder with a simple configuration. The purpose is to

[0010]

[Means for Solving the Problems]

 In order to achieve such an object, according to the present invention, a cleaning machine that cleans the circumferential surface of a printing cylinder or roller by pressing the cleaning cloth running under tension against the circumferential surface of the rotating printing cylinder or roller is used. In the printing cylinder / roller cleaning device, a detection device for detecting the looseness of the cleaning cloth by attaching a detector to the running cleaning cloth is provided.

[0011]

[Action]

 When the printing cylinder or roller is rotated and the cleaning cloth is pressed against the peripheral surface of the printing cylinder or roller, the foreign matter adhering to the peripheral surface of the printing cylinder or roller is transferred to the cleaning cloth. , Foreign matter transferred to the cleaning cloth is carried away. If the cleaning cloth breaks or sticks to the peripheral surface of the printing cylinder and the cleaning cloth relaxes, the detector detects this and gives a signal, and the machine stops, so no accident occurs.

[0012]

【Example】

 1 and 2 show an example in which a printing cylinder / roller cleaning device of a printing machine according to the present invention is applied to a blanket cylinder as a printing cylinder, and FIG. 1 shows a printing cylinder / roller cleaning device when a cleaning cloth is in a tensioned state. FIG. 2 is a side view of the printing cylinder / roller cleaning device with the cleaning cloth loosened. In the figure, in the vicinity of the blanket cylinder 1, a hollow rewinding shaft 2 and a take-up shaft 3 extending in the axial direction of the blanket cylinder 1 are rotatably supported at their both ends on a supporting portion of a device frame (not shown). A pair of guide rollers 4 and 5 rotatably supported at both ends by bearings of the apparatus frame are provided on the peripheral surface of the rubber drum 1 so as to be detachably supported. Is pressed through.

In a separate step, a belt-like cleaning cloth 6 made of non-woven fabric or the like is fully wrapped around the rewinding shaft 2 mounted on the apparatus frame, and the wound cleaning cloth 6 is unwound onto the guide roller 4. The cleaning cloth 6 is guided to the winding shaft 3 via the guide roller 5. Initially, the winding shaft 3 mounted on the apparatus frame in an empty state is driven by a driving device (not shown) to rotate intermittently, and the cleaning cloth 6 guided from the guide roller 5 is intermittently moved as illustrated. It is configured to be rolled up.

On a support pin 7 located near one end of the winding shaft 3 and planted from the apparatus frame side, a lever 8 as an L-shaped detection body swings a boss portion 8a. The bent piece 8b at its free end is attached to the back surface of the cleaning cloth 6 which runs between the guide roller 5 and the winding shaft 3 in a tensioned state. The bent piece 8b of the lever 8 is pressed against the back surface of the cleaning cloth 6 between the spring hook 9 planted in the boss portion 8a of the lever 8 and the spring hook 10 planted in the device frame. A tension spring 11 that stretches the lever 8 in a directional manner is stretched.

Further, in the vicinity of the boss portion 8 a of the lever 8, a normally open type limit switch 12 which is connected to the control device and whose contacts are open in normal time is provided with the contacts facing the free end of the lever 8. When the cleaning cloth 6 is loosened, the lever 8 swings to close the contact at its free end, and the rotation of the machine base is stopped via the control device.

A cleaning operation by the printing cylinder / roller cleaning device configured as described above will be described. When the peripheral surface of the blanket cylinder 1 is cleaned after the printing work is completed, the winding shaft 3 is intermittently rotated while the blanket cylinder 1 is rotated in the direction shown by the arrow in the figure, and the cleaning cloth 6 is washed. When the roller is intermittently run, foreign matters such as ink residue and paper dust adhering to the surface of the blanket cylinder 1 are transferred to the cleaning cloth 6 and carried away by the cleaning cloth 6, and the cleaning cloth 6 does not have foreign matter attached. It is wound on the winding shaft 3. When the cleaning cloth 6 on the rewinding shaft 2 is exhausted, the empty rewinding shaft 2 is replaced with the rewinding shaft on which the cleaning cloth is fully wound in another process. The winding shaft 3 around which the dirty cleaning cloth 6 is wound is replaced with an empty winding shaft. During the printing operation, the entire cleaning device is retracted from the blanket cylinder 1 and stored.

During the cleaning operation, the cleaning cloth 6 is under tension, and as shown in FIG. 1, the bending piece 8b of the lever 8 is pressed by the cleaning cloth 6 against the pulling force of the tension spring. Then, if the cleaning cloth 6 is broken for some reason or adheres to the peripheral surface of the blanket cylinder due to the viscosity of the ink, the cleaning cloth 6 tends to be caught in the blanket cylinder 1, but at this time, as shown in FIG. Since the lever 8 sags, the lever 8 is rotated clockwise by the pulling force of the tension spring 11. As a result, the free end of the lever 8 presses the contact point of the limit switch 12 to close the circuit, so that the rotation of the machine base is stopped via the control device and the cleaning cloth 6 is wound on the blanket cylinder 1. Accidents can be prevented in advance. In this case, the time from the breaking of the cleaning cloth 6 to the stop of the rotation of the machine base is extremely short.

In the present embodiment, the entire detection device is provided on the back side of the cleaning cloth 6, and the contact of the limit switch 12 is of the normally open type so that the contact is closed in an emergency. Only the cleaning cloth 6 may be provided on the front side, and the contact of the limit switch may be a normally closed type so that the contact can be opened in an emergency. Even when the entire detection device is provided on the front side of the cleaning cloth 6, a normally open type limit switch can be used by changing the position of the limit switch.

In this embodiment, the contact of the limit switch 12 is opened / closed at the free end of the lever 8. However, the boss 8a of the lever 8 is provided with a projection or a concave hole, which allows the limit switch 12 to operate. The contact of may be opened and closed.

Further, the limit switch 12 may be provided with an actuator, and the free end of the limit switch 12 may be directly attached to the cleaning cloth 6 to detect the relaxation of the cleaning cloth 6.

In the present embodiment, the present invention is applied to the blanket cylinder as the printing cylinder, but the invention is also applied to printing cylinders other than the blanket cylinder such as an impression cylinder, a transfer cylinder, and a discharge cylinder. In addition, the same effect can be obtained because the same can be applied to the rollers such as the attachment roller and the swing roller.

Further, in the present embodiment, an example in which the cleaning cloth 6 is pressed against the peripheral surface of the blanket cylinder or the like by the guide rollers 4 and 5 is shown, but it is disclosed in, for example, JP-A-63-286350. Alternatively, the cleaning cloth may be pressed against the peripheral surface of the blanket cylinder or the like with a pad.

[0023]

[Effect of the device]

 As is clear from the above description, according to the present invention, the cleaning cloth, which runs intermittently in a tension state, is pressed against the peripheral surface of the rotating printing cylinder or roller to clean the peripheral surface of the printing cylinder or roller. In the printing cylinder / roller cleaning device of a printing machine, a detector is attached to the running cleaning cloth to detect the relaxation of the cleaning cloth.The detector detects the relaxation of the cleaning cloth. The time from the start of rotation of the printing machine to the stop of the printing machine can be significantly shortened, the cleaning cloth is not caught on the printing cylinder and rollers, and accidents can be prevented before they occur, improving safety. As a result, the amount of cleaning cloth consumed decreases. Further, unlike the conventional case, it is not necessary to provide a device for cutting the cleaning cloth when it is loosened, so that the structure can be simplified and the apparatus can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a side view of a printing cylinder / roller cleaning device when a cleaning cloth is in a tensioned state.

FIG. 2 is a side view of the printing cylinder / roller cleaning device in a state where the cleaning cloth is relaxed.

[Explanation of symbols]

 1 blanket cylinder 2 rewinding shaft 3 winding shaft 6 cleaning cloth 8 lever 12 limit switch

Claims (1)

[Scope of utility model registration request] 1. A printing / roller cleaning device of a printing machine, wherein a cleaning cloth running in a tension state is pressed against a peripheral surface of a rotating printing cylinder / roller to clean the peripheral surface. A printing cylinder / roller cleaning device for a printing press, which is provided with a detection device for detecting the looseness of the cleaning cloth by attaching a detection body.