JPH02217248A - Gear for driving drum of offset printing machine - Google Patents

Abstract

PURPOSE: To facilitate correction of angle of rotation by providing two expanding walls with a projected crosssection faced to each other on the base of a gear and fitting a clamping device acting in the axial direction on these expanding walls. CONSTITUTION: Expanding walls 17 and 17', 18 and 18', 19 and 19' and 20 and 20' positioned in facing to each other and formed into a projected shape in its crosssection in the radial direction are respectively formed into a double V-shape on each base of gears 3, 4, 5 and 6. In addition, clamping devices 21 and 22 acting in the axial directions are provided along circles on gears 3-6 on the expanding walls 17 and 17', 18 and 18', 19 and 19' and 20 and 20'. Fine control of the diameter of each gear, adjustment of the local shape of a rim 27 or movement of a pitch circle can be performed by these clamping devices. It is possible thereby to relax of vibration when a press is driven and to decrease wear of gears.

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a gear according to the preamble of claim 1.

[Conventional technology]

A gear of this kind is known from DE-AS 1650784! be. The tightening device used in this case for deforming the rim is additionally attached to the base of the gear (the part of the gear excluding the rim). For this tightening, the device can exert a radial tightening force or adjusting force! This causes the rim to deform in the radial direction. With this measure, the gear wheel is partially enlarged in one or more places 14. However, this measure is unsuitable for slightly increasing the diameter over the entire circumference of the gear. For this purpose, multiple tightening devices are required. In this case, however, the clamping device is designed as a clamping screw that is movable in the axial or radial direction, so that the gearwheel must be provided with a large number of holes, like a perforated plate. The strength of this type of gear is insufficient for transmitting large torques.

Furthermore, according to DEi-PS No. 2829026, a drive device using a member is known for the tightening located on the outside of both cars, and this tightening is performed by the member - simply by using an H-shaped screw. It will be done.

The axial elastic deformation of the helical rim of the gear provides the adjustment variable acting on the play adjustment.

However, the disadvantage of this is that damage to the meme table due to deformation of the rim movement is unavoidable. Furthermore, the lateral deflection of the rim causes a partial unilateral movement, which causes the germs to spew out. As a result, the spur teeth become partially scalloped. As a result, the engagement deteriorates, the area of tooth contact 9 decreases, and the set seminal thigh cannot be maintained for a long time.

In addition, it can only be damaged to the extent that shocks and vibrations occur, which can also lead to wear of the tooth surfaces.

Two-wall disc gears with shrinkage-fixed rims, generally by casting or RI welding, are known. However, the disc now serves as a support for the torque transmission reservoir by the gear and cannot be expanded.

[Problem of the present invention]

The problem of the present invention is to provide a gear for driving the cylinder of an offset printing press, in which not only the rim of the gear is partially deformed in the radial direction without impairing the torque transmission of the base of the gear, but also the entire rim of the gear is deformed. K is chosen so that an increase in diameter over the circumference is also possible.

[Means to solve the problem]

The structure of the present invention that solves the above problems is as described in the claims.

[Actions and effects of the present invention]

The advantage of the invention is that the rotation of the gears of the gear train is extremely smooth and that radial adjustments are made to correct rotational angle errors. Vibration is buffered and the wear and tear of the graphic is reduced. No harmful effects on the rim occur. A gear wheel formed according to the invention is not only enlarged locally, but also increases in diameter over its entire circumference. In that case, the basic body of the table is preloaded by internal forces and exhibits a slightly elastic behavior.

〔Example〕

In FIG. 1, the two lower parts of a multicolor, TolI 9-sheet-fed rotary printing press are configured as the same module, in which case:
An impression cylinder 1; 8 and a sheet 1* conveying cylinder 9; 1υ are each received in the side stands 15, 16 of the module. Impression cylinder l.

8 and the shaft journal 17 of the sheet conveying cylinder 9.10.
．． 12.13.14 have gears a, 4, 5 . as in the known format.
6 is fixed. In that case, the shaft journal 17,1
2.13.14 are supported in two mutually different planes 1; 2.

The presence of an error in one of the gears 3, 4, 5.6 forces the gear train to rotate asynchronously. In order to eliminate this rotational error, the gears 3, 4, 5 formed according to the present invention are
．． 6 must be provided. All tables cooperating with each other may be constructed according to the invention.

- the basic body of the table 3, 4, 5.6 has, according to the invention, two widening walls 17.1γ', which are located opposite each other and are convex in radial section, for the gear wheel 3; C, expansion wall 18
, 18' for gear 4, expansion wall 1 N , 19'
is for the gear 5, and the expansion walls 2υ and 20' are M for the gear 6. In one advantage, the expansion wall is formed in a two-sided V shape. In the illustrated embodiment, the wheel is formed as a cast part, but it could also be formed as a welded part. Gear 3.4,
The basic body of 5.6 is fitted with expansion means to increase the diameter or locally increase the gear. Expansion wall 17.1γ', 18.
II (', 19.19'.

20, 20' are provided within the contour of the gear.

Expansion walls 17, 17'; 18, 18'; 19
, 19'; 20, 20' are provided with tightening devices (21, 22) that act in the axial direction. A large number of these clamps provided along a circle on the gears 3 to 6 can vary the diameter in the range of microns or one-hundredth of a millimeter depending on the device. Furthermore, there is also the possibility of obtaining local deformations of the rim 2T and thus pitch circular movements. In FIGS. 6 and 4, the symbol Δr indicates the difference when the diameter increases. The enlarged outlines of 3-6 daggers are shown in chains. Preferably, the gear wheel is made of gray cast iron GGG-60 (70), which can be suitably elastically deformed.

In the embodiment of FIG. 3, the tightening device 21,22 has a tightening screw 21 which is guided by a detail in the front widening wall 18-20 so as to be axially movable in the bore 24. There is. The tightening screw 21 is attached at the end to the rear expansion wall 17'.
It is fully threaded to fit into a screw hole 26 provided at 20'.

The heads of the tightening screws 21 are supported by the front expansion walls 1γ to 2 (IK) via washers 23 and the like in the tightened state.

In the embodiment shown in FIG. 4, a spacing sleeve 22 of equal length is provided around the tightening screw 210 inserted into a relatively large bore 24 in the front expansion wall 17-20. It is supported by the inner wall of the rear expansion walls 17' to 20'.

This results in the same preload being adjusted in gears 3-6. Separating sleeves 22 of the same length can be used individually or, if necessary, in combination with different lengths of separating sleeves 22, which can provide the tightening screw with the necessary adjusting movement depending on the previously determined rotational angle error of the gear wheel. may be exchanged with

In FIG. 2, the reference numeral 25μ indicates the core hole through which the core is to be taken out from the manufactured product.

[Brief explanation of the drawing]

1 is a schematic representation of the lower part of a multicolor sheet-fed rotary printing machine with sheet conveying and impression cylinders and drive gears; FIG. 2 is a section of the gear wheels according to an embodiment of the invention; 6 is a radial sectional view of a pick-up roller according to an embodiment of the present invention, and FIG. 4 is an impression cylinder of the present invention, 9.10... for conveying sheets 'Jk. Trunk, 17°12.13.14...Axis journal, 17, 18°19.20.17', 18', 19'
, 20'... Expansion wall, 21... Tightening screw, 22.
...Separating sleeve, 24...hole, 26...screw hole,
2γ... Rim procedural amendment (method) % formula % Display of the case 1999 Patent application No. 262310 Name of the invention Person who corrects gears to drive the cylinder of an offset printing press Relationship to the case

Claims (1)

[Claims] 1. A gear for driving a cylinder of an offset printing press, which may include a tightening device that rotates together with the gear for synchronizing rotation of the cylinder, and a rim of the gear. is more or less radially deformable depending on the adjustment, the base of the gearwheel (3-6) is provided with two convex cross-sections.
expansion walls (17, 17'; 18, 18'; 19, 19
'; 20, 20') are provided facing each other,
Tightening devices (21, 22) acting axially on this expansion wall
) is attached to a gear for driving the cylinder of an offset printing press. 2. Expansion wall (17, 17'; 18, 18'; 19, 19
'; 20, 20') are movably mounted with a tightening screw (21) acting in the axial direction as a tightening device;
This tightening screw is inserted into the hole (2) of the front expansion wall (17-20).
4), which is guided by a shaft in the rear expansion wall (17',
18', 19', 20'), and the head of the tightening screw (21) is supported by the front expanding wall (17-20) in a tightened state. The gear described in 1. 3. The front expansion wall (17-20) has relatively large holes (2
4), and a tightening screw (24) is installed in this hole (24).
21) is provided with a separating sleeve (22) in each case, which separates the rear expansion wall (17').
3. Gearwheel according to claim 2, wherein the gearwheel is supported on the inner wall of the clamping screw (21). 4. Expansion wall (17, 17'; 18, 18'; 19, 19
Gearwheel according to one of claims 1 to 3, characterized in that the clamping screw (21) is opposed by a spacing sleeve (22) of the same length in order to obtain a uniform preload of the clamping screw (20, 20'). 5. Gearwheel according to claim 1, characterized in that a separating sleeve (22) of different lengths is located opposite the clamping screw (21), depending on the rotation angle error. 6. Expansion wall (17, 17'; 18, 18'; 19, 19
6. Gearwheel according to claim 1, characterized in that the gears (20, 20') are double V-shaped in radial section.