JPS6124288B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a sheet feeding device for a rotary printing press, which comprises a sheet feeding device that lifts and feeds sheets to be processed from a sheet pile, a front gauge and a side gauge. a register table for preparing sheets fed in a scale-overlapping manner to be drawn in by the drawing device of the rotary printing press; and a ramp for moving the sheets towards a side gauge. a row conveyance member; a conveyance table that conveys the sheets sent out from the paper feeder to the front gauge of the registration table using the sheet conveyance device;
The present invention relates to a paper feeder, a conveyance table, and a drive device that drives a rotary printing press in synchronized cycles.

BACKGROUND OF THE INVENTION From German Patent Application No. 1230041, a sheet feeding device is known which is primarily used for feeding printed sheets to a coating machine without any interruptions. This sheet feeding device has the disadvantage that, together with the speed of the conveyor table, the speed of the register table and the sheet feeding device can also be varied. However, this makes it impossible for this sheet feeding device to cooperate with a cyclically operating printing press. This is because in this case an orderly delivery of the sheets to the printing press is no longer guaranteed.

Furthermore, in this known sheet feeding device, the sheets are drawn toward the side gauges by means of cyclically acting lateral tension devices. Although this pulling movement is a short one, it requires a certain minimum amount of time, independent of the sheet processing machine, and can only be carried out at properly defined times, and it must be possible to It must be finished before the paper reaches the top of the register table. Therefore, when sheets are conveyed in an overlapping manner on a conveyor table, a predetermined minimum pitch interval is required between the overlapping sheets, and as a result, the sheet material Taking advantage of the maximum permissible impact velocity of the sheet against the front gauge of the registration table, defined by the stiffness of Even if
The sheet-processing machine will no longer be able to operate at speeds exceeding a predetermined maximum number of cycles.

Another sheet feeding device is West German Patent No. 840847.
It is known from the specification no. This sheet feeding device was designed to completely avoid overlapping of sheets on the conveyor table, and for this reason, the frequency of the sheet processing machine was considered to be high at that time. had to be restricted to a predetermined value. In other respects this second
This known device has the same drawbacks as the first known device.

A sheet feeding device of the type mentioned at the outset is known from DE 24 52 051 A1. With this feeding or registering principle, thin sheets can be distorted, so that reliable operation is no longer guaranteed at high feeding speeds.

The object of the invention is to improve a sheet feeding device for a rotary printing press of the type mentioned at the outset so that this sheet feeding device can be used when the sheets are made of a relatively rigid material, for example cardboard. Although it is guaranteed that the number of cycles and thus the working speed of a printing press or other processing machine connected to the register table can be significantly increased without exceeding the permissible maximum impingement speed of the sheet against the front gauge of the registration table, It is an object of the present invention to enable registration by means of conventional lateral tensioning devices when the sheets are made of flexible material.

According to the present invention, this problem is solved because the drive device that drives the paper feeding device, the conveyance table, and the rotary printing press in synchronized cycles has a transmission device that can change the transmission ratio for the conveyance table. By means of this transmission device, the pitch spacing of the overlapping sheets on the conveyor table can be reduced, and a lateral tensioning device is provided for pulling the sheets toward the side gauge. This problem was solved in that, depending on the sheet thickness, the lateral tensioning devices or the diagonal transport elements were switched to a deactivated state.

With this configuration, the pitch interval of the sheets overlapped in a scale-like manner on the conveyor table can be reduced to approximately half that of other sheet feeding devices currently on the market. The operating speed of the printing press can be almost doubled. However, the same machine can also be used to process sheets of lighter paper quality, at the expense of slower operating speeds. In this case, it is effected only when the sheet speed is zero and is carried out by means of a tensioning device which pulls the sheet in an unloaded state towards the side gage.

The invention will now be explained with reference to the drawings: FIG. 1 shows a sheet feeder 1 and a rotary printing press 3 connected to the sheet feeder 1. FIG. However, only the paper feed cylinder 5, plate cylinder 7, blanket cylinder 9, impression cylinder 11, and paper discharge cylinder 13 of the rotary printing press 3 are shown schematically. The sheet feeding device 1 consists of a sheet feeder 15, a transport table 17 and a registration table 19, which cooperates with the sheet feed cylinder 5 via a swing gripper (not shown).

The paper feeding device 15 has a paper handling device 23 in the frame 21.
This paper sorter 23 lifts the uppermost sheet of the sheet pile 27 loaded on the pallet 25 and pushed into the frame 21, and transfers it to the feed roller 2.
Supply to 9. The feed roller 29 feeds the fed sheet to the conveyor table 17 after the sheet is pressed onto the feed roller 29 for a short time by several pressure rollers 31 .

The conveyor table 17 has a predetermined number of endless conveyor belts 33 running parallel to each other. These conveyor belts 33 have 2
It is guided via book shafts 35, 37. The sheets fed from the feed roller 29 of the paper feeding device 15 to the conveyor table 17 are pressed against the conveyor belt 33, so that the sheets are fed to the registration table 19 in a scale-like partially overlapping state. Ru.

The registration table 19 has a predetermined number of controlled front gauges 43 and one fixed side gauge 4.
5. These front gauges 43
and side gauge 45, conveyor belt 3
The sheets fed by 3 are registered and prepared for removal by the retraction device of the rotary printing press. In order to draw the sheets into the rotary printing press by means of the drawing device, the front gauge 43 is swiveled downwards in a suitably controlled manner.

In the exemplary embodiment shown, the sheet feeding device 1 is driven from the rotary printing press 3 via a drive shaft 47.
This driving force is branched in the paper feeder 15, and is transmitted to the paper sorter 23 via an adjustment transmission 49 and a drive shaft 51 on the one hand, and a transmission 53 that can change the transmission ratio and a paper reduction gear on the other hand. It is transmitted to the feed roller 29 of the paper feeding device 15 via the transmission device 55. The drive of the conveyor belt 33 takes place via a shaft 37 on the right side of the drawing. The registration table 19 is driven directly from the rotary printing press in a manner not shown.

If the sheet is relatively flexible and cannot be shifted without raising the leading edge of the sheet, or if the sheet is stationary and the load from the following sheet is not small. Registration table 1
If the sheets are of such light quality that they cannot be drawn to the side gauges 45 of 9, it is advantageous to use a known lateral tensioning device 57, as shown in the left part of FIG. In this case, the conveyor belt 33 of the carriage 17 is arranged parallel to the edges of the carriage 17 and at right angles to the front gauge 43, somewhat differently from the situation shown in FIG. .

However, according to a key feature of the invention, the lateral tensioning device 57 is switched so that it does not act if the sheets of paper consist of a relatively rigid material, for example cardboard, so that the action of the lateral tensioning device 57 is switched off. As an alternative, it is possible to use sheet transport forces which are already applied in two mutually orthogonal directions on the transport platform 17. As a result, the operating speed of the rotary printing press 3 can be increased considerably, taking into account the maximum permissible impact speed when the sheet impinges on the front gauge 43.

In FIG. 2, a first embodiment is shown which generates a combined sheet feeding force on the transport carriage 17 in the direction towards the front gauge 43 and in the direction perpendicular thereto. ing. This combined sheet-feeding force results in a combined sheet-feeding force directed primarily toward the side gauge 45. In this case, the deflection roller 39 for the conveyor belt 33, shown on the left side of the drawing, is moved axially towards the side gauge 45, so that the conveyor belt 33 is only skewed. Advantageously, the movement of the shaft 35 is effected by two screws 59 acting on the ends of the shaft 35. The conveyor belt 33 is the redirection roller 3
In order to prevent it from slipping off from 9, the deflection roller can be configured in the form of a barrel.

In this embodiment, the sheet fed from the feed roller 29 of the paper feeder 15 is conveyed diagonally, diagonally downward in FIG. The gauge 43 and the side gauge 45 are collided almost simultaneously.
The sheets are then brought into perfect register by the shifting action of the conveyor belt 33 and, if appropriate, the shifting action of subsequent sheets before being drawn into the rotary printing press 3.

As shown in FIG. 3, the paper sorter 23 of the paper feeder 15 has a predetermined number of lifting holders 61 at its rear end, that is, at its right end in the drawing.
This lifter 61 lifts the uppermost sheet of the sheet pile 27 near the trailing edge. The sheet is then received by a predetermined number of transport pickers 63 and transported by these transport pickers 63 towards the feed rollers 29 . For this purpose, the transport carrier 63 is fixed, for example, by means of a plate cam 67 to a carriage 65 which is movable in the sheet feed direction and in the opposite direction against the force of a spring 69. However, if the pitch of the sheets that overlap in a scale-like manner falls below a predetermined value, the trailing edge of the preceding sheet will obstruct the path of the conveyor 63.
The conveyor can no longer be used.

In this case, the transport feeder 63 has to be switched off and the feeding of the sheets in the paper feeder 15 has to be taken over, for example, by the lifter 61. In this case, the lifting rack 61 moves the sheet lifted by the lifting rack 61 toward the feed roller 29. For this purpose, the lifter 61 is also fixed by means of a plate cam 73 to a carriage 71 which is movable in the sheet feed direction and in the opposite direction against the force of a spring 69. The feeding movement of the feeder 61 or 63 that is not used for sheet feeding can be prevented by the locking pawls 75 and 77 that can lock the levers 79 and 81 with rollers that follow the plate cams 67 and 73. .

In FIG. 4, a second exemplary embodiment is already shown in which the sheets are fed on the conveyor table 17 in two mutually orthogonal directions. In this embodiment, the conveyor belt 33 is connected to the conveyor table 17 as usual.
Endless registration belts 83 are provided which extend parallel to both side edges of the conveyor belts 33 and are perpendicular to these conveyor belts 33. As can be seen in FIG. 5, this registration belt 83 circulates via two deflection rollers 85 and runs in a plane somewhat lower than the plane of the conveyor 17 on the upper belt side. The sheet of paper located on the register belt 83 is held by two spheres 87 which are held by a boulder 89 and are freely rotatable and movable in the vertical direction, so that the sheet is It is designed to be able to move quite freely on the conveyor table 17.

A third embodiment of a mechanism for conveying sheets obliquely as required is shown in FIG. In this case, the conveyor table 17 is tilted toward the side gauge 45 together with a conveyor belt 33 (not shown) about an axis parallel to the longitudinal direction of the conveyor table 17, and is vibrated by a vibrator 91. . In this way, the sheet is gradually moved toward the side gauge 45, although the sheet is pressed by the pressing roller 41, but with its leading edge kept parallel. In this embodiment, an eccentric body 95 is used to tilt the conveyance table 17 about the hinge 93.

In the above three embodiments, an additional side stopper (not shown) is installed at approximately the side gauge 4.
5 in the same plane to ensure that sheets reaching the edge early are received and fed to the side gauge 45.

A commonly used lateral tensioning device 57 is shown in FIG. A tension shoe 97 movable parallel to the front gauge is disposed within the recessed portion of the registration table 19, and this tension shoe 97 is driven via a roller 99 that engages with a cam groove 98 of the shaft 96. be done. The sheet to be registered is pressed against a tension shoe 97 by a roller 94 mounted on an angle lever 92 and controlled via a roller 90 by a cam surface 88 of an axle 96 against the force of a spring 86. , thereby being drawn toward the side gauge 45 or another side gauge 84 attached to the angle lever 92.

A locking pawl 82 is used to prevent the lateral tension device 57 from working when the sheet is fed obliquely toward the side gauge 45 on the conveyor table 17. This locking pawl 82 is rotated within the rotation movement path of the angle lever 92 and the angle lever 92 is rotated.
prevent the rotation of the

The transmission ratio of the transmission 53 shown in FIG. 1 can be varied stepwise or continuously. This transmission 53 has a stepped transmission ratio or is designed in such a way that the conveying speed on the conveyor 17 ensures an integral number of sheets overlapped in scales on this conveyor 17. It is advantageous to have suitable adjustment marks. This makes it possible to provide the overlapping sheets with a predetermined pitch distance that is dependent on the length of the conveyor 17.

The adjustment transmission device 49 provided in the drive device of the paper sorter 23 does not change the rotation speed but simply shifts the output in time with respect to the input. Useful for varying the phase of the mechanism. As a result, if a transmission device 53 capable of changing the transmission ratio in stages is used, the slip of the sheet on the conveyor table 17 can be canceled out, or the transmission ratio can be changed steplessly. Transmission device 53 that can be
When using a machine, the number of scale-like sheets on the conveyor table 17 is not limited to an integer number, that is, the pitch interval of the scale-like overlapping sheets is arbitrarily selected to operate the machine. be able to.

The sheet deceleration transmission device 55 is configured to transport the sheet to the front gauge 43 while maintaining a predetermined average conveyance speed.
speed to reach and possibly feed roller 2
9 or keep the impingement speed of the sheet against the front gauge 43 at a permissible value and, if appropriate, the delivery of the sheet from the feed roller 29. It can be used to transport sheets at a higher average speed over the transport platform while keeping the speed at a predetermined value.

[Brief explanation of the drawing]

The drawings show a plurality of embodiments of the present invention, in which FIG. 1 is a schematic side view of a sheet feeding device of a rotary printing press, and FIG. 2 is a schematic side view of a sheet feeding device of the present invention. 3 is a schematic diagram of paper handling in the sheet feeding device of FIG. 1; FIG. 4 is a plan view of a second embodiment of the sheet feeding device of the present invention; FIG. 6 is a partially sectional front view of a third embodiment of the sheet feeding device of the present invention, and FIG. 7 is a side view of the lateral tensioning device. It is a diagram. 1... sheet feeding device, 3... rotary printing press, 5
... Paper feed cylinder, 7 ... Plate cylinder, 9 ... Rubber cylinder, 11 ...
... Impression cylinder, 13 ... Paper discharge cylinder, 15 ... Paper feeding device, 1
7...Transportation table, 19...Registration table, 21...
Frame, 23... Paper handling, 25... Pallet, 27... Sheet pile, 29... Feed roller, 31... Pressure roller, 33... Conveyor belt, 35, 37... Shaft, 39... Change Facing roller, 4
1...Crimping roller, 43...Front gauge, 4
5... Side gauge, 47... Drive shaft, 49...
Adjustment transmission device, 51... Drive shaft, 53... Transmission device, 55... Sheet reduction transmission device, 57... Lateral tension device, 59... Screw, 61... Lifting capacitor, 63... Conveying capacitor , 65... shuttle, 67
...Plate cam, 69...Spring, 71...Reciprocating stand, 7
3... Plate cam, 75, 77... Locking claw, 79, 8
1... Lever with roller, 82... Locking claw, 83
...Registration belt, 84...Side gauge,
85... Direction changing roller, 86... Spring, 87... Sphere, 88... Cam surface, 89... Holder, 90...
Roller, 91... Vibrator, 92... Angle lever, 93... Hinge, 94... Roller, 9
5... Eccentric body, 96... Shaft, 97... Tension shoe, 98... Cam groove, 99... Roller.

Claims (1)

[Claims] 1. A sheet feeding device for a rotary printing press, which includes a sheet feeding device 15 that lifts and sends sheets to be processed from a sheet pile 27, and a front gauge 4.
3 and a side gauge 45, a registration table 19 for preparing sheets fed in an overlapping manner to be drawn in by a drawing device of a rotary printing press; Diagonal transport member 3 to be moved toward
3, 35, 59; 33, 83, 87, and the sheets sent out from the sheet feeding device 15 are transferred to the sheet conveying device 33.
The front gauge 43 of the register table 19 is
In the case of a type that is provided with a conveyance table 17 for conveying the paper to the paper feeder 15, a drive device 47 for driving the paper feed device 15, the conveyance table 17, and the rotary printing press 3 at synchronized cycles, the drive device 47 For the carriage 17, it has a transmission 53 which can change the transmission ratio, and by means of which the carriage 1
The pitch interval of the overlapping sheets of paper on top of 7 can be reduced, and a lateral tensioning device 57 is provided to pull the sheets toward the side gauge 45, and the thickness of the sheets can be reduced. in connection with the lateral tensioning device 57 or the oblique conveying member 33, 35, 59;
A sheet feeding device for a rotary printing press, characterized in that 33, 83, 87 are switched to a non-operative state. 2. Sheets are fed toward the front gauge 43 by a predetermined number of mutually parallel endless conveyor belts 33, and pressure rollers press the sheets against these conveyor belts 33. 41 and a deflection roller 39 for the endless conveyor belt 33
2. A sheet feeding device according to claim 1, wherein one of the two shafts 35, 37 having a shaft 35, 37 is movable in the axial direction. 3 An endless registration belt 83 extending substantially perpendicularly to the direction toward the front gauge 43 is provided on the conveyor table 17, and the upper belt section of the register belt 83 is provided on the conveyor table 17. A sphere 87 running somewhat below the plane and above the register belt 83 which is held in a holder 89 freely rotatable and movable in the vertical direction presses the sheet against the register belt 83. A sheet feeding device according to claim 1 or 2, which is operated to act on the sheet feeding device. 4 The conveyor table 17 is aligned with the longitudinal axis 9 of the conveyor table 17
The sheet feeding device according to any one of claims 1 to 3, wherein the sheet feeding device is configured to be able to rotate about a center point 3 and to be vibrated by a vibrator 91. . 5. Any one of claims 1 to 4, wherein the transmission device 53, which is provided in the drive device of the conveyance table 17 and is capable of changing the transmission ratio, is switchable in at least two stages. The sheet feeding device described in .