JPH04234656A - Cylinder revolution drive for multicolor sheet-feed press - Google Patents

Abstract

PURPOSE:To provide the cylinder revolution drive of a multicolor sheet-feed press, in which the displacement of a driving side cylinder and a driven side cylinder is reduced and which can correspond to a change into multicolor, by diminishing the transmitting power of a gear and bringing the rigidity of the gear and a gear shaft to a conventional value in this invention. CONSTITUTION:The cylinder revolution drive of a multicolor sheet-feed press is composed of the speed command device of the multicolor sheet-feed press, a detector obtaining the actual operating speed of said press, a speed compensating circuit acquiring the speed deviation of an operating-speed command signal and an actual operating speed signal and outputting a driving torque command, a torque command dividing circuit dividing the driving torque command into a first driving torque command and a second driving torque command, and first and second torque servo devices turning and driving the cylinder of the press respectively according to the first and second driving torque command.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder rotation drive device applied to a multicolor sheet-fed printing press.

0002

2. Description of the Related Art Sheet-fed printing machines print by arranging the following five types of cylinders. Figure 5 shows sheet-fed printing machine 4.
A typical example of a color machine body arrangement is shown. 10 is a plate cylinder to which a plate based on an aluminum plate is attached. 2
0 is a blanket cylinder, and a blanket is wrapped around the surface of the cylinder, and printing is performed on the blanket by contact with the plate cylinder 10. Reference numeral 30 denotes an impression cylinder which conveys the paper in its mouth and generates printing pressure between it and the blanket cylinder 20 during the conveyance, thereby transferring the ink on the blanket cylinder 20 onto the paper. Reference numeral 40 denotes an intermediate cylinder, which transports paper between colors (between units) and between other parts (sheet feeding section, etc.). Reference numeral 50 denotes a paper discharge cylinder, which conveys paper between the printing section and the paper discharge section. Normally, one print cylinder 10, one blanket cylinder 20, one impression cylinder 30, and one intermediate cylinder 40 are provided for each printing unit for one color. 6
0 is the drive motor of the sheet-fed printing press. Cylinders such as the plate cylinder 10, blanket cylinder 20, impression cylinder 30, intermediate cylinder 40, and paper discharge cylinder 50,
It is driven by meshing gears. The method of attaching this gear to the barrel is shown in FIG. 6, and an outside gear type is adopted in which the gear 70 is moved outside the frame 80 to be shielded from dust and dirt, and the gear is forcibly lubricated. In addition, in FIG. 6, 90 is lubricating oil, 10
0 is the case.

0003

[Problem to be solved by the invention] Helical gears are used for trunk gears in order to smoothly transmit rotation, but due to the structure of helical gears, when a load is applied to transmit rotational force, the shaft A force is generated in the direction. This force causes flexural deformation of the gear. Since the teeth of the gear are cut diagonally, this deformation of the gear causes a shift in the circumferential positional relationship between the driving side cylinder and the driven side cylinder. This amount of deviation varies depending on the magnitude of the gear load. When viewed as a printing machine, if this amount of deviation exceeds a certain level, printing problems will occur. As a countermeasure to this problem, the torsion angle of the helical gear is reduced and the shaft is made thicker and shorter to increase rigidity. However, in recent years, there has been a trend toward multi-color sheet-fed printing presses, and when driven by a single drive motor, the gear load increases according to the number of colors, making it difficult to increase the rigidity of the gears and shafts. It's here. SUMMARY OF THE INVENTION An object of the present invention is to provide a drum rotation drive device that maintains the rigidity of gears and shafts as before and can accommodate multiple colors.

0004

[Means for solving the problem] (1) Reduce the power transmitted through one gear. That is, in order to reduce the gear load, the number of drive motors for the printing press is two. (2) The direction of the power flow is constant to prevent backlash and backlash that are characteristic of gear drives. (3) The drive torque command, which is the output of the speed compensation circuit that controls the operating speed of the printing press, is divided into two parts and distributed to two torque servo devices including the drive motor. (4) In order to keep the direction of power flow constant, a drive torque difference (torque bias) is applied to the two torque servo devices.

[0005]

[Operation] The power transmitted by the gear is reduced, the deformation of the gear and the gear shaft is reduced, and the misalignment between the driving side shell and the driven side shell is reduced. Since the same side of the tooth profile of the gear system always comes into contact, the effects of backlash are eliminated and controllability is improved.

[0006]

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. In the configuration diagram shown in FIG. 1, reference numeral 1 denotes a speed command device, which outputs an operating speed signal of the printing press. A speed detector 2 detects the actual operating speed of the printing press and outputs an actual operating speed signal. 3 is a speed compensation circuit which calculates the deviation between the operating speed signal and the actual operating speed signal using PID (proportional control, integral control, differential control) and outputs a driving torque command. Reference numeral 4 denotes a torque command dividing circuit, which divides the driving torque command into two according to a predetermined method and outputs the divided circuit as a first driving torque command and a second driving torque command. Reference numeral 5 denotes a first torque servo device, which is an electric motor drive device that receives the first drive torque command and generates a drive torque corresponding to the drive torque command. Reference numeral 6 denotes a second torque servo device, which is an electric motor drive device that receives the second drive torque command and generates a drive torque corresponding to the drive torque command. Reference numeral 7 denotes a mechanical system of the multicolor sheet-fed printing press, which is driven in a distributed manner by the first torque servo device 5 and the second torque servo device 6.

Although the configuration of the present invention is shown in FIG. 1, the elements other than the torque command division circuit 4 can be achieved by known techniques, so the torque command division circuit 4 will be explained with reference to FIG. 41 is a multiplier, and the torque command division circuit 4
The drive torque command inputted to the controller is accurately divided into two parts. 42 is a torque bias setting device, which outputs a driving torque difference (torque bias) to be applied to the two torque servo devices so that the direction of power flow is constant. An adder 43 adds the output value of the multiplier 41 and the torque bias to output a first driving torque command. A subtracter 44 subtracts the torque bias from the output value of the multiplier 41 and outputs a second driving torque command. Here, the sum of the first drive torque command and the second drive torque command exactly matches the drive torque command, and does not cause any disturbance to the speed control system.

FIG. 3 shows a power flow diagram of an 8-color sheet-fed printing press according to the present invention, and FIG. 4 shows a power flow diagram of an 8-color sheet-fed printing press with a conventional apparatus. Both Figures 3 and 4,
Driving power for each color printing unit (600 is the power for the first color, 6
20 is the second color power, 640 is the third color power, 660 is the fourth color power, 680 is the fifth color power, 700 is the sixth color power, 7
20 indicates the 7th color power, 740 indicates the 8th color power)
are all considered to be equal. Further, a broken line 500 indicates the direction of the flow of power, and the flow is always in the same direction in order to eliminate play and backlash of the gears. Further, the width of the diagonal arrow represents the magnitude of the transmitted power. In FIG. 3, the first torque servo device 5 is placed upstream of the first color, and the second torque servo device 6 is placed between the fourth and fifth colors, and in FIG. , is placed upstream of the first color.

According to FIG. 4, the drive motor power 1000 requires drive power for eight colors of printing units. This means that the gear in the first color printing unit is printing unit 8.
This means that it must have sufficient rigidity to transmit the driving power for each color. From this, it can be seen that the transmission power 3000 between the first and second colors transmits the driving power for seven printing units, and the transmission power 400 between the fourth and fifth colors transmits the driving power for four printing units.

According to FIG. 3, the first torque servo device power 100 is the sum of the driving power for the four colors of the printing unit and the bias power 350 for maintaining the direction of power flow. The second torque servo device power 200 is the power obtained by subtracting the bias power 350 from the driving power for the four colors of the printing unit. Comparing FIG. 3 and FIG. 4, it can be seen that according to the present invention,
It becomes possible to reduce the transmitted power of the gears, that is, the gear load, while maintaining the direction of the power flow, and it becomes possible to maintain the rigidity of the gears and shafts as before, and to enable a drive that can accommodate multiple colors. be understood.

[0011]

Effects of the Invention The cylinder rotation drive device for a multicolor sheet-fed printing press according to the present invention includes a speed command device that outputs an operating speed command signal for the multicolor sheet-fed printing press, and a speed command device that outputs an operating speed command signal for the multicolor sheet-fed printing press, and a speed control device for outputting an operating speed command signal for the multicolor sheet-fed printing press, and a speed control device for outputting an operating speed command signal for the multicolor sheet-fed printing press. a speed detector that calculates the speed and outputs an actual operating speed signal; a speed compensation circuit that receives the operating speed command signal and the actual operating speed signal, calculates a speed deviation, and outputs a driving torque command in accordance with the amount of the speed deviation; It has a function of inputting the driving torque command and outputting a first driving torque command and a second driving torque command, and the sum of the first driving torque command and the second driving torque command is the driving torque command. a torque command dividing circuit having a function of dividing the torque command so as to match the torque command;
a first torque servo device that rotationally drives the cylinder of the multicolor sheet-fed printing press in accordance with a driving torque command; and a second torque servo device that rotationally drives the cylinder of the multicolor sheet-fed printing press in accordance with the second driving torque command. By comprising the torque servo device, it has the following effects. By reducing the transmission power of the gear, the deformation of the gear and the gear shaft is reduced, the misalignment between the driving side cylinder and the driven side cylinder is reduced, and the quality of multicolor printing is improved. Since the flow direction of power is constant and a torque bias is applied, the influence of backlash is eliminated.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a specific configuration of the torque command division circuit shown in FIG. 1;

FIG. 3 is a power flow diagram in an eight-color sheet-fed printing press according to the present invention.

FIG. 4 is a power flow diagram in a conventional eight-color sheet-fed printing press.

FIG. 5 is a diagram showing a cylinder arrangement of a general four-color sheet-fed printing press.

FIG. 6 is a schematic diagram of a conventional outside gear system.

[Explanation of symbols]

1 Speed command device 2 Speed detector 3 Speed compensation circuit 4 Torque command split circuit 5 First torque servo device 6 Second torque servo device 7 Multicolor sheet-fed printing machine mechanical system

Claims (1)

[Claims] 1. A speed command device that outputs an operating speed command signal for a multicolor sheet-fed printing press; a speed detector that determines an actual operating speed of the multicolor sheet-fed printing press and outputs an actual operating speed signal; a speed compensation circuit that inputs the operating speed command signal and the actual operating speed signal, calculates a speed deviation, and outputs a driving torque command according to the amount of the speed deviation; the first drive torque command and the second drive torque command.
a torque command dividing circuit having a function of dividing the sum of the driving torque commands so that the sum of the driving torque commands matches the driving torque commands; A cylinder of a multicolor sheet-fed printing press, comprising: a torque servo device; and a second torque servo device that rotationally drives the cylinder of the multicolor sheet-fed printing press in accordance with the second drive torque command. Rotary drive device.