JPH01160642A - Drive for cam control type paer-feed mechanism - Google Patents

Abstract

PURPOSE: To suppress vibration by arranging at least one cam controlled torque balance transmission on a paper feed drum shaft thereby minimizing fluctuation in the driving torque of a paper feed mechanism. CONSTITUTION: A torque balance transmission 28 is arranged on a paper feed drum shaft 16. The torque balance transmission 28 comprises a balance cam 29 having a synchronous part 29.1 and an inverting part 29.2 for driving a balance rotary mass 32 through a roller 30 and a lever 31 with roller. The torque balance transmission 28 further comprises a balance counter cam 33 corresponding to the balance cam 29 and acting on the balance rotary mass 32 through a roller 34 and a lever 35 with roller. Motion of the balance cam 29 relative to the synchronous part 29.1 and the inverting part 29.2 is preferably realized by one impactless sine curve. Since a large torque generated during one halt cycle is compensated by the balance transmission 28, vibration does not take place in a paper feed mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive device for a cam-controlled paper feed mechanism, in particular in a rotary printing press.

[Conventional technology]

A rotary printing press consists of one or more printing stations, the first printing station being attached to a paper feed plate from which the paper, which is stationary in a consistent flow, is moved periodically. The tray is grabbed by the grab of the feed mechanism, accelerated to machine speed, and passed to a rotating cylinder (feed drum).

The drive of the paper feed mechanism consists of a random transmission and is connected to the printing section of the printing press via a gear system.

The periodic operation of the paper feed mechanism requires a periodically varying torque that causes vibrations in the paper feed mechanism that are directed through the gear system to the printing station. This vibration can cause misalignment or duplication, resulting in poor print quality and defective products.

To solve this problem, an inelastic auxiliary rotor (B
et Iauf'er) to ensure continuous contact of the flank surfaces and improve the quality of printing. However, this inelastic auxiliary rotor can only be used in printing presses with a single size cylinder.

It is also known to use elastic auxiliary rotors to ensure contact of the flank surfaces of gear wheels in cyclically operated mechanisms. However, this auxiliary rotor has to be designed according to the maximum machine speed, which causes high stresses on the gear wheels at all speeds, which leads to severe wear. Moreover, this elastic auxiliary rotor can only provide reliable contact of the flank surfaces of the gear wheels up to very low powers and requires a large amount of construction space.

In addition, elastic and inelastic auxiliary rotors allow continuous contact of the flank surfaces in a given range due to the gear bias pressure, but they have the common disadvantage that the bias pressure increases wear. are doing. Furthermore, alignment is performed by an auxiliary rotor (An l agepa
sser) is simply removed,
It is impossible to prevent that torque from being transmitted to subsequent printing presses and having an adverse effect on print quality.

Direct control of torque demand or torque variations is also known. For this purpose, flywheels are often used, but due to the existing masses of the impression, blanket and form cylinders, these have to be of very large dimensions, so that they cannot be used in special cases.

Furthermore, torque-balancing transmissions are known which are designed as sliding crank transmissions, but because of their top dead center and bottom dead center, they cannot be applied to cyclically operating paper feed mechanisms. This is because the time course of the torque characteristics does not change in the required region (Masz). Furthermore, printing presses operate in a subcritical range, resulting in additional deviations.

Spring compensators are also known to balance the torque;
It is always designed for a maximum rotational speed, which is accompanied by high wear, and below which rotational speed vibrations occur in the mechanism. Therefore, this also cannot be applied to the paper feeding mechanism.

Further, ideally cam-controlled torque balance transmission devices are known, but their use in printing presses has not been suggested.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to create a drive for a cam-controlled feed mechanism that improves printing quality, reduces press wear, and is universally applicable.

SUMMARY OF THE INVENTION It is an object of the present invention to create a drive device for a paper feed mechanism in such a way that the magnitude of torque fluctuations is minimized without vibrations occurring in the mechanism.

[Means to solve the problem]

According to the invention, this is achieved in that, in addition to the drive cam and the countercam of the feed mechanism, at least one cam-controlled torque-balancing transmission is arranged on the feed drum shaft.

The motion principle for the cam of the torque-balanced transmission is realized by at least one shock-free sine curve for the synchronous part and the reversible part.

〔Example〕

The present invention will be described in detail below with reference to embodiments shown in the drawings.

Figure 1 shows an impression cylinder 2, a blanket cylinder 3, a plate cylinder 4, a paper feed drum 5,
1 shows a paper feed device 1 of a rotary printing press in a side view, consisting of a paper feed plate 6 and a periodically operating paper feed mechanism.

In this embodiment, the paper feed mechanism is designed as a rocker device 7 and is supported on a rocker wheel 7.1.

A lateral alignment device 8 and a leading edge stop device 9 are provided on the paper feed plate 6 . A tightening grab 10 is provided on the paper feed drum 5 and the impression cylinder 2.

A worm gear 12 and an impression cylinder gear 13 are fixedly arranged on an impression cylinder shaft 11 . The worm gear 12 is connected to a worm 1 connected to a main motor 26 via a human power system 27.
2.1, and the impression cylinder gear 13 is in mesh with the rubber cylinder gear 1.
4, it meshes with a plate cylinder gear 15 and a paper feed drum gear 17 disposed on a paper feed drum shaft 16. As shown in FIG. 2, a cam 18 of the swinging device 7 is supported on the paper feed drum shaft 16 together with a driving opposing cam 19.

The cam 18 consists of a synchronous part and a reversible part. The drive countercam 19 is designed accordingly.

The driving cam 18 is operatively connected to the quadrilateral link mechanism 2.2 via a roller 20 and a lever with a roller 21, and the driving counter cam 19 is operatively connected to the quadrilateral link mechanism 2.2 via a roller 23 and a lever with a roller 24. ing. Drive cam 18
Accordingly, the movement course achieved by the driving opposing cam 19 is shifted by 180' and has mirror symmetry.

Also arranged on the feed drum shaft 16 is a torque balancing transmission 28, which has a synchronous part 29.1 and a reversing part 29.
．． It has a balance cam 29 with 2. A balanced rotating mass 32 is driven by this torque balanced transmission device 28 via a roller 30 and a lever 31 with a roller. A counterbalanced cam 33, which is designed correspondingly to the balanced cam 29 and is likewise arranged on the feed drum shaft 16, is operatively connected to the balanced rotary mass 32 via a roller 34 and a roller lever 35. Synchronous part 29.1 and inverted part 29
.

Balanced cam 29 and balanced opposing cam 3 using the front cam
3 can also be configured in one piece.

The device according to the invention works as follows.

The paper feed plate 6 is fed in stages, the leading edge being brought together by the leading edge stop device 9 and then the side edges being brought together by the side aligning device 8. The stationary paper is grabbed by the grab 10 of the rocker 7, then the leading edge stop 9 is rocked out and accelerated to machine speed, and the paper feed drum 5
The clamp is passed to the glove 10 for tightening. Then, the paper is transferred from the grip 10 of the paper feed drum 5 to the grip 10 of the impression cylinder 2, and then printed. After the paper is transferred to the grab 10 for tightening the paper feed drum 5, the swinging device 7 is returned to the return position (rest position).

A movement back to the paper feed plate 6 then follows, during which a further acceleration to the machine speed is followed by a deceleration to the rest position. This movement profile results in a torque profile with the same but larger torque values in the two half-cycles.

The paper feed drum shaft 16 is connected to an input system 27 by a main motor 26.
, worm 12,1, worm gear 12, impression gear 13
and the paper feed drum gear 17. A cam 18 and a counter cam 19 disposed on the paper feed drum shaft 16 cause the paper to be fed through a roller 20, a lever with a roller 21, and a quadrilateral link mechanism 22, or a roller 23, a lever with a roller 24, and a quadrilateral link mechanism 25. Accordingly, the swinging device 7 is controlled. Balance cam 29 on paper feed drum shaft 16
By means of the balanced transmission 28, which is arranged by the counterbalanced cam 33, the large torque values of the torque curve occurring in a half cycle are compensated for, so that no vibrations occur in the feed mechanism.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the paper feeding device of a printing press with a paper feed plate, Figure 2 is a diagram of the principle of the swing device drive mechanism, Figure 3 is a diagram of the principle of the torque balance device, and FIG. 4 is a basic configuration diagram of the three-dimensional arrangement structure of the transmission device on the paper feed drum shaft. 1... Paper feeding device, 2... Impression cylinder, 3... Rubber cylinder, 4
... plate cylinder, 5... paper feed drum, 6... paper feed plate,
7... Rocking device, 7.1... Rocking shaft, 8... Side alignment device, 9... Leading edge stop device, 10... Tightening with grab, 11... Impression cylinder Shaft, 12... Worm gear, 1
2.1...Worm, 13...Impression cylinder gear, 14...
・Blank cylinder gear, 15... Plate cylinder gear, 16... Paper feed drum shaft, 17... Paper feed drum gear, 18... Drive cam, 19 axis... Opposing drive cam, 20...・Laura, 2
DESCRIPTION OF SYMBOLS 1... Lever with roller, 22... Quadrilateral link mechanism, 23... Roller, 24... Lever with roller, 25
... Quadrilateral link mechanism, 26... Main motor, 27.
...Human power system, 28...Torque balance transmission device, 29...
・Equilibrium cam, 29.1... Synchronous part, 29.2...
Reversing portion, 30... Cam roller, 31... Lever with roller, 32... Balanced rotating mass, 33... Balanced opposing cam, 34... Roller, 35... Lever with roller. Applicant's agent Sato - Yuotsu Ft'g, 3 1'j' Zlt313235 Ft''g, 4 9r:, ne-

Claims (1)

[Claims] 1. In a drive device for a cam-controlled paper feeding mechanism in which paper is fed to a paper feeding drum, and the paper feeding drum is disposed together with a drive cam on a common paper feeding drum shaft. , a drive device for a cam-controlled paper feed mechanism, characterized in that at least one torque balancing transmission (28) controlled by a balancing cam (29) is arranged on the paper feed drum shaft (16). 2. The movement course of the balance cam (29) is different from the synchronous part (29.
2. Drive device according to claim 1, characterized in that it is realized by at least one shockless sine curve for the reversal section (29.2) and the reversal section (29.2).