JPH0624583A - Paper feeding device for printing press - Google Patents

Abstract

PURPOSE: To correct the upper surface of an uneven sheet pile in a simple form by improving the paper feeding device of a printing machine. CONSTITUTION: Pivoted boards 8, 9 supporting a sheet pile 1 are fixed to a pile board 2 and each of the boards 8, 9 is constituted to be rotatable from a horizontal position through a lifting means 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device of a printing machine, which comprises a paper stack for receiving sheet piles, the paper stack being held by a chain. And the upper edge of the pile can be automatically lifted via the pile lifting device so that the upper edge of the pile can be located in the working area of the separating device and the conveying device, respectively for the uppermost sheet. And the position of the upper edge of the pile is monitored by the measuring device.

[0002]

2. Description of the Prior Art The upper edge of a sheet pile does not extend exactly horizontally in a straight line, but rather, for example, in a curved or inclined position or in a non-uniform manner in a similar manner. This is a known fact in practice. As a result, the pile will be pressed differently during its storage and the above-mentioned pressing forces will cause the individual sheets to be partially deformed, or will be different when viewed from above the sheet surface. The result is that there is high humidity. These lead to a non-uniform upper surface of the pile, which results in the suction device of the separating device and the conveying device not being able to accurately suck the respective uppermost sheets, which results in Supply will be disrupted. Conventionally, printers insert wedges laterally into the pile in certain areas to orient the surface substantially horizontally. However, this type has the disadvantage that the position of the wedge has to be changed as the pile height decreases. The reason is that as the pile height decreases, the deformation of the upper surface of the pile also becomes smaller, which necessitates frequent changes in the position of the wedge.

In the case of modern highly automated machines, it is inadequate to spend a lot of time on this measure and to have the printer perform a precise view of the sheet pile. In addition, the measuring device, which looks at the position of the upper edge of the pile, transmits an incorrect value to the pile lifting device, and as a result, this may also cause an obstacle in the running of the paper of the paper feeding device.

[0004]

Starting from these facts, the object of the present invention is to improve the feeder so that the uneven top surface of the pile can be corrected in a simple manner.

[0005]

In the present invention, a swivel plate supporting a sheet pile is fixed to a paper stack, and each swivel plate is swung from a horizontal position via lifting means. By being possible, the above-mentioned subject was able to be solved.

[0006]

By placing the sheet pile on a swivel plate additionally provided, and by means of lifting means provided on the swivel plate, a predetermined partial area of the sheet pile is of a simple form. It is possible to lift it up so that its upper surface can extend sufficiently horizontally. Thus, in this configuration, it is sufficient to activate the lifting means in order to achieve the orientation of the upper edge of the pile, so that the cumbersome wedge insertion can be dispensed with.
As a result, the lifting means can be actuated, for example, by means of a push button, so that the correction can be carried out in the shortest possible time without having to support a wedge-like part in the area of the machine.

In an advantageous configuration of the invention, the swivel plate is pivotably fixed in the central area of the paper stack and the lifting means act on the swivel plate in the edge area of the paper stack. At that time, the lifting means is supported by the paper stack. Thus, for example, it is possible to carry out a partial correction in the outer pile region in order to reorient the upper edge of the pile, which is inclined downwards, horizontally.

In another advantageous embodiment of the invention, two swivel plates are provided, which swivel plates are
The right and left halves of the pile are respectively supported as seen in the sheet feeding direction in the printing press. The lifting means are in this case formed as screw spindles with bearings in the paper stack and in the swivel plate, which can be driven electrically via a common adjusting drive. According to the invention, the adjusting drive has at least one electric motor, which is controllable by a measuring device for the upper edge of the pile. Thus, if a plurality of measuring devices, for example in the form of a sensor, are arranged at the upper edge of the pile, this makes it possible to achieve an automatic orientation of the upper edge of the pile. If multiple motors are installed in the adjustment drive of each swivel plate,
It is possible to accurately carry out a partial orientation of the entire pile surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is illustrated in the drawings and will now be described in detail.

FIG. 1 shows a sheet pile 1 in a sheet feeding device of a printing machine, which is not shown via a paper stack 2 which is hooked on a chain 3. Of the pile, so that the upper edge 4 of the pile can be located in the area of the separating and conveying device (not shown) for the respective uppermost sheet. The position of the upper edge 4 of the pile is then monitored by a measuring device 5, which is, for example, a number of sensors. After that, the individual sheets are supplied from the upper surface of the pile to the paper feeding table 7 via the conveying rollers 6 (FIG. 2).

On the stacker 2, swivel plates 8 and 9 supporting sheet piles are fixed. The swivel plates 8 and 9 and the paper stack 2 are fixed in the central region, for example via swivel bearings 10. This causes the swivel plates 8 and 9 to swivel from a horizontal position, allowing the upper edge 4 of the pile to extend fully horizontally. 1 and 3, the swiveling plates 8 and 9 swiveled.
The position of is shown. As a lifting means, a screw spindle 11 is shown in FIG. 3, which screw spindle 11 supports the bearing 12 in the edge region of the sheet pile 1.
It acts on the swivel plate 8 via. Further, the screw spindle 11 is connected to the paper loading table 2 via the thrust bearing 13.
A bevel gear 13 is provided below the screw spindle 11. The drawing shows two swivel plates 8, 9 supporting the right and left halves of the pile, respectively.

FIG. 4 shows the adjusting drive.
The device is provided with a bevel gear 15 which meshes with a bevel gear 14 of the screw spindle 11. Both bevel gears 14,
15 is connected via a drive shaft 16 to an electric motor 17, which is controllable, for example, by means of the measuring device 5, whereby the swiveling plates 8, 9 are swiveled considerably from the horizontal. . At that time, the drive shaft 16
Through the bearing 18 and the electric motor 17, the chevron bearing 1
It is fixed to the paper stack 2 by 9. In the embodiment shown, each swivel plate 8, 9 is provided with its own electric motor 17 with a drive shaft 16 so that both plates 8, 9 can swivel independently of each other. . In a similar manner, each individual screw spindle 11
Can also be provided with its own adjusting motor 17, in which case, for example, four swivel plates can be provided.

[Brief description of drawings]

FIG. 1 is a front view of a pile end face in a longitudinal direction of a machine.

FIG. 2 is a side view of a sheet pile.

3 is a sectional view of FIG. 1 with a swivel plate and lifting means.

4 is a sectional view of FIG. 2 with a swivel plate and lifting means.

[Explanation of symbols]

 1 Sheet pile 2 Paper stack 3 Chain 4 Upper edge of pile 5 Measuring device 6 Conveyor roller 7 Feeding table 8 and 9 Swivel plate 10 Swivel bearing 11 Screw spindle 12 Bearing 13 Thrust bearing 14 and 15 Umbrella Gear 16 Drive shaft 17 Electric motor 18 Bearing 19 Angle support

Claims (5)

[Claims] 1. A paper feeding device of a printing machine, comprising a paper stack for receiving a sheet pile, wherein the paper stack is hooked on a chain and above the pile. It is adapted to be automatically lifted through a pile lifting device so that the edges can be located in the working area of the separating device and the conveying device for the respective uppermost sheet, and the pile In the type in which the position of the upper edge is monitored by a measuring device, a swivel plate (8, 9) supporting a sheet pile (1) is fixed to a paper stack (2), The individual swivel plates (8, 9) are also provided with lifting means (11, 12, 1).
3) A sheet feeding device of a printing machine, which can be swung from a horizontal position through the sheet feeding device. 2. A swivel plate (8, 9) is fixed to the swivel bearing (10) in the central region of the paper stack (2) and a lifting means in the edge region of the sheet pile (1). (11, 12, 13) is the swivel plate (8,
9) acting on the lifting means (11, 12, 13)
Is supported on a paper stack (2),
The sheet feeding device according to claim 1. 3. Two swivel plates (8, 9) are provided, said swivel plates (8, 9) being seen in the sheet feeding direction in the printing press, the right half and the left half of the pile. 3. The sheet feeding device according to claim 1, wherein the sheet feeding device supports the sheet feeding device. 4. Lifting means (11, 13) is a support part (1).
2, 13) is formed in the paper stack (2) and the swivel plate (8, 9) as a screw spindle (11) with a common adjusting drive (8, 9). 3. The paper feeding device according to claim 2, wherein the paper feeding device can be electrically driven via the (11, 14, 15, 16, 17). 5. Adjusting drive (11, 14, 15, 1)
6, 17) has at least one electric motor (17) which is controllable by a measuring device (5) for the pile upper edge (4). The paper feeding device according to claim 4.