JP2620491B2 - Cleaning equipment for blanket cylinders of printing presses - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for a blanket cylinder of a printing press, which comprises a tank for a cleaning liquid, and a cover which is rotatable and capable of contacting the blanket cylinder. A plurality of spray nozzles for spray-cleaning the cleaning roller with a cleaning liquid, which are arranged at intervals in the axial direction and fixed to one wall of the tank body, and which are parallel to the cleaning roller. , Which are held by the tub and are operatively connected to a plurality of adjusting screws, which are distributed over the entire length of the physician and are connected to the wall of the tub. It relates to a type that is screwed into a part.

[0002]

2. Description of the Related Art A cleaning device of this type is disclosed in DE 39 03 434 A1. A plurality of stopper pins are screwed into the front wall of the tank body in order to prevent the doctor from bending due to the frictional force in the rotating direction of the cleaning roller when pressing the doctor against the covering of the cleaning roller. The pin has its tip mounted on the upper surface of the doctor. Further, in order to avoid being pressed and separated, a plurality of other stopper pins are similarly screwed into the front wall of the tank body, and the tips of the pins abut against the back wall of the doctor. . That is, the doctor is supported by the two adjusting screw systems in two directions, that is, a direction facing upward against deflection and a direction facing forward with respect to the front wall of the tank body. This known specification states that two adjusting screw systems need to prevent the occurrence of vibrations or chattering phenomena during operation of the cleaning device, but this is not realized in practice. This is due to the fact that the doctor can move freely in the direction of the washing roller either downwards or backwards. That is, the coating of the cleaning roller does not provide the correct resistance to downward movement. In this example, it must also be taken into account that the active edge of the doctor may be non-planar or wear over its operating time. The same applies to the cleaning roller or its coating.

[0003] In addition, German Utility Model Registration No. 7
No. 005448 describes a roller doctor for the coating cylinder, which roller doctor is supported on its opposite side by a number of pneumatic pistons which are spaced in the longitudinal direction of the doctor. ing.
For this purpose, a substantially semi-cylindrical receptacle is formed at the front side of each pneumatic piston, into which a roller doctor is inserted. This allows the roller doctor to be supported both upwards and downwards and also in the direction of the force opposite to the coating cylinder, but not in the direction of the force towards the coating cylinder. Thus, unwanted vibrations can occur during operation which can adversely affect the quality of the manufactured product.

[0004] US Pat. No. 3,521,561 discloses that
An ink knife for an impression cylinder is disclosed, the deflection of which can be adjusted by a plurality of spaced screws, ie tangentially to the impression cylinder. However, no radial adjustment is possible with this known arrangement.

[0005]

SUMMARY OF THE INVENTION Starting from the aforesaid prior art, the object of the present invention is to improve a cleaning device having the configuration according to the preamble of claim 1 and to reduce the disadvantageous vibration and vibration during operation. The object is to make it possible to adjust the position of the doctor very accurately without chattering.

[0006]

According to the present invention, an adjusting screw is positively connected to a doctor and has two screw sections with different pitches. The screws to be adjusted by these two screw sections are screwed into corresponding threads formed in the wall of the tank or in the doctor.

[0007]

Each adjusting screw can be adjusted by a desired amount, i.e., it can be applied to the cleaning roller or pulled away from the cleaning roller. In this case, the doctor is shaped and connected by adjusting screws everywhere,
And it is held in a frictional connection. In contrast to the prior art according to DE 39 03 434, a very good result is achieved with only one adjusting screw system, which is sufficient and has a relatively simple construction. I have. This is because the doctor can be pulled apart and undefined deflection and alignment of the doctor can be prevented. The prescribed retracting function of the doctor is not possible with the device already discussed based on the above-mentioned German Utility Model Registration No. 75054848, but it is possible with the device according to the invention.

According to the invention, the form-locking connection between the adjusting screw and the doctor can mean that the two parts cannot be moved relative to one another or can only be limited within an elastic range. Means If the transferable force is exceeded, this connection is broken.

It is advantageous if the adjusting screw is positively locked in the blind hole of the doctor. This means that the blind hole is only accessible to the side of the front wall of the tank body, on all other sides the blind hole is surrounded by the material of the doctor and thus surrounds the blind hole The doctor material is adapted to prevent movement of the doctor with respect to the adjusting screw. Longitudinal movement of the adjusting screw can be reliably prevented by a positive connection of the two parts.

A number of possibilities are obtained by positively connecting the two parts to one another. The adjusting screw has two thread sections with different pitches,
According to an embodiment of the invention, the adjusting screw is screwed into a corresponding thread in the wall of the vessel or in the doctor in one of the two screw sections. The threaded connection forms the required positive connection between the two parts.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments.

In the lateral frame 1, the illustrated cleaning device is mounted so as to be tiltable about a shaft 2 so that the cleaning device can be applied to or pulled away from a blanket cylinder (not shown). It is configured to be able to.

The cleaning apparatus has one tank body 3 and a cleaning roller 4 rotatably supported in the tank body and driven to rotate. The rotation direction of the cleaning roller 4 is indicated by an arrow in FIG. 5
Indicated by

A plurality of spray nozzles 7 which are spaced from each other in the axial direction are fixed to the front wall 6 of the tank body 3, and these spray nozzles 7 direct the spray flow of the cleaning medium to the cleaning roller 4. So that it does not face the bottom of the tank 3.

The doctor 8 is provided with a plurality of blind holes 9 ′ having threaded sections, which are spaced apart from each other, and each blind hole 9 ′ is provided with a threaded section at the front of each adjusting screw 10. 9 is screwed. Adjustment screw is another screw division 1
1 and the adjusting screw by means of the screw section 11
It is screwed into a corresponding thread formed on the front wall 6 of the tank body 3 or into a bush inserted into the front wall 6.

Further, in the tank 3, thin metal plates 12, 13 for drawing out a cleaning liquid or a spray liquid are arranged.

The thread sections 9, 11 of the adjusting screw 10 have different pitches. Therefore, when the adjusting screw is rotated, the doctor 8 can be applied to the cleaning roller 4 in the longitudinal direction of the adjusting screw or can be separated from the cleaning roller 4. This is done on a zone-by-zone basis via a plurality of adjusting screws 10 which are arranged at a distance from one another.

The adjusted position of the adjusting screw can be fixed via a nut 14.

In other words, the doctor 8 can be fine-tuned in each zone by means of adjusting screws 10 with different threads arranged in each zone, with the screw sections 9, 11 being provided.
Are held frictionally and positively on all sides by adjusting screws 10. In other words, during operation, the aforementioned vibration and chattering phenomena, which are disadvantageous in the prior art, no longer occur. This is achieved inexpensively by a single adjusting screw system or zone screw system.

[Brief description of the drawings]

FIG. 1 is a front view of main components of a cleaning device of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 Reference Signs List 1 side frame 2 axis 3 tank body 4 washing roller 5 arrow 6 front wall 7 spray nozzle 8 doctor 9 screw section 9 'blind hole 10 adjustment screw 11 screw section 12, 13 thin metal plate 14 nut

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Klaus Siemet Geisenheim am Morschberg 8 Germany (56) References JP-A-63-218357 (JP, A) JP-A-58-101061 (JP, A) JP-A-5-169643 (JP, A) JP-A-56-165634 (JP, U) European Patent Application Publication 381830 (EP, A)

Claims (2)

(57) [Claims] 1. A cleaning device for the blanket cylinder of the printing press, the tank body for cleaning liquid (3), mounting of the cover A contact Sawaka capacity in time Utateka rotatably a blanket cylinder Tank body (3) arranged at an interval in the axial direction with the cleaning roller (4 )
Cleaning roller with cleaning liquid fixed to one wall of
Multiple spray nozzles for spray cleaning (4)
(7) and provided with a doctor (8) arranged in Jikutaira line for the cleaning roller, the doctor (8) tank body (3)
Is held in being operatively connected to a plurality of adjusting screws (10), these adjusting screws are of the type which are distributed over the entire length of the doctor have been screwed to the wall of the vessel body (3) in the adjustment screw (10), form-fitting manner be attached to the doctor (8), two with a different pitch
Thread sections (9, 11)
In the same section, the adjusting screw (10) is attached to the wall (6) of the tank (3).
Corresponding thread formed in the doctor or in the doctor (8)
A cleaning device for a blanket cylinder of a printing press, wherein the cleaning device is screwed into the device. 2. The cleaning device according to claim 1, wherein the adjusting screw (10) is form- lockingly engaged in a blind hole of the doctor (8).