JP2703741B2 - Method and apparatus for automatically changing piles in an automatic paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method and an associated device according to the preamble of claim 1.

[0002]

2. Description of the Related Art An automatic sheet feeder is known from DE 41 310 014 A1. The sheet feeder is provided with a device consisting of two support rakes which are located beside the feeder and which can be moved into its lifting area in order to automate the pile change. The support rake takes up the remaining pile, called the auxiliary pile, from the main pile lift from a predetermined pile height position in preparation for feeding a new sheet pile, and lifts the auxiliary pile at machine cycles. During this time, a new pile is placed in the feeder and lifted below the auxiliary pile. The control of the proper position for bringing the auxiliary pile and the main pile together is at least two lift sensors (Aufla) of at least one rake rod of the supporting rake.
ufsensoren). With this, the withdrawal of the support rake is started. However, when pulling out the support rake, care must be taken to ensure a good adaptation to the sheet supply to the sheet processing machine. If the drawing is too fast, the center of the auxiliary pile will drop in a short time, which will be a hindrance to subsequent delivery to the sheet transport table. No mention is made of the control of the support rake during withdrawal in the above device.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic sheet feeder for transferring individualized sheets to a sheet processing machine when a main pile and an auxiliary pile are combined into one. The aim is to find a method and a device that guarantees continued work.

[0004]

The above object is attained by claim 1.
And the characteristics of the devices assigned to it.

[0005]

According to the arrangement of the simple height position sensor (possibly already provided) and the combination with the driving device of the pile rake, the surface position of the auxiliary pile is not largely changed at the time of transfer to the subsequent sheet conveying table. It is guaranteed that the main pile and the auxiliary pile are one. The unevenness of the surface of the auxiliary pile, poor pile quality or unevenness due to different frictional conditions during pile rake removal is no longer important. The measuring device reports in each case too great an error and can stop the drawing process until the level of the auxiliary pile is normal again. The process is terminated when the auxiliary pile rests on the main pile at the center.

[0006]

FIG. 1 shows an automatic sheet feeder 1 for automatically feeding a sheet pile (shown as a main pile 2) to a sheet processing machine 20, for example a printing press.
The automatic paper feeder includes a lifting device 3, an individualizing device 4, and a pallet transport device 5. Further, an auxiliary pile support device 6 is arranged in the machine frame of the automatic paper feeder 1. The auxiliary pile support device consists of a frame 7, which is composed of a main pile 2
Support the feeder 8 of the pile rake 9 on both sides.
The feed device 8 comprises a drive 12, for example a pneumatic cylinder, which is connected to the pile rake 9.
Each pile rake 9 consists of a plurality of parallel bars, which bars are fixed to a holder 13. The holder 13 is movable in the horizontal direction on the linear guide 14, and is connected to the drive device 12 via, for example, a chain drive device.
Further, the auxiliary pile supporting device 6 is provided with a separate auxiliary pile elevating device 10, and the auxiliary pile elevating device is similarly arranged on the machine frame of the automatic paper feeder 1 and separately raises and lowers the auxiliary pile 11. Do.

In FIG. 2, the automatic sheet feeder 1 is connected to a sheet processing machine 20. FIG. 2 shows a state where the pile is being replaced. The auxiliary pile 11 is lifted by the auxiliary pile elevating device 10 in parallel with the sheet transfer section to the sheet conveying table 21 connected to the automatic sheet feeder 1, and at the same time, the main pile 2 approaches from below. Individualizing device 4 is auxiliary pile 11
And lifts the individual paper sheet, and moves it forward onto the sheet transport table 21. Delivery of paper sheet
Only when the paper sheet is continuously transferred from the pile surface onto the sheet conveying table 21, the operation can be performed without any trouble. That is, no trouble means that the surface of the auxiliary pile 11 is always kept within an error range at the transfer edge 22 to the sheet transport table 21.

The transfer zone is shown in detail in FIG. The runway of the delivered paper sheet is indicated by B. The auxiliary pile 11 is supported by the pile rake 9 and lifted up to the transfer edge 22. A tiltable stopper 15 is located in front of the transfer edge 22, and the stopper periodically releases the path of the paper sheet. Following the transfer edge 22, a double sheet control device (Doppelbogenkonto)
(Rollinrichtung) 16 is arranged. The level of the auxiliary pile 11 is the sheet transport table 21
Is monitored by a sensor 17 in front of the vehicle. The sensor is fixed to the machine frame of the automatic paper feeder 1.
The sensor 17 is connected to the control of the drive 12 by means of an interrogation device 18, so that the movement for pulling out the pile rake 9 can be controlled depending on the level of the pile surface.

FIG. 4 shows the steps of the method according to the invention step by step in partial views a) to d). Here, the departure state is a state in which the main pile 2 is in contact with the lower surface of the pile rake 9. The methods belonging to this are not described in detail here.

A) When the main pile 2 reaches the lower surface of the pile rake, the main pile is lifted in synchronization with the auxiliary pile 11, that is, with a constant interval from the auxiliary pile. Withdrawal of the pile rake 9 is introduced.

B) While the auxiliary pile 11 is held at the level of the transfer edge 22, the pile rake 9 is pulled off to the side. A sensor 17 for monitoring the pile level is activated.

C) Since the distance between the pile rakes 9 is increased by pulling out the pile rake 9, the auxiliary pile 1
1, the lower the level of unhindered sheet feeding becomes. The sensor 17 signals this and interrupts the movement for withdrawing the pile rake 9.

D) When the pile surface level is sufficient again, the pile rake 9 is moved again, while the pile level is continuously monitored. This process can be repeated multiple times during the pile change. This process is completed when the deflected auxiliary pile 11 reaches the surface of the main pile 2. The pile rake 9 can also perform a pull-out movement if the remaining distance to the pile merging is within an error limit of the pile height position at the transfer edge 22. When the pile rake 9 is completely withdrawn, the auxiliary pile 11 rests on the main pile 2.

FIG. 5 shows the sequence again with the aid of a flow chart, in which the pile rake 9 is shown parallel to the auxiliary pile 11. Main pile 2 is auxiliary pile 1
When the pile rake 9 is lifted to 1, a command to start the pulling-out movement of the pile rake 9 can be issued. The sensor 17 determines the position of the surface of the auxiliary pile 11 if this is not activated for control of the pile height in any case.
And is switched to be connected to the control unit of the feeding device 8. The pull-out movement of the pile rake 9 is indicated by the arrow 19. During the movement of the pile rake 9, the auxiliary pile 11 is continuously lifted in synchronization with the consumption of paper. The position of the level of the pile surface relative to the transfer edge 22 is continuously monitored. This surface must not be separated from the transfer edge by more than a predetermined maximum amount, otherwise the paper sheet will be obstructed at the leading edge when it is fed onto the sheet transport table 21 using the individualizing device 4. . This will cause the paper sheet to be delayed or its position will fluctuate unacceptably. As long as the sensor 17 indicates the command "level of the auxiliary pile OK" during the pull-out movement of the pile rake 9, the pull-out movement is continued and it is still monitored whether the pile rake 9 has already been completely pulled out. When the pile rake 9 is at a predetermined position, the distance between these front ends is so large that the auxiliary pile 11 between the pile rakes is slightly bent.
This state is recognized by the sensor 17 and the control unit is notified that "the auxiliary pile level is not OK". This immediately stops the withdrawal movement of the feeder 8. As long as the pile rake 9 has not yet been completely withdrawn, the pile level is continuously monitored by the sensor 17. In this state, the auxiliary pile 11 and the main pile 2 are synchronously lifted further, and the pile surface is again moved within the error range with respect to the transfer edge 22. When the level of the auxiliary pile 11 is again within the error range, the sensor 17 again signals "auxiliary pile level OK" and the control unit returns to the feeding device 8.
Resume the withdrawal movement at. This process is repeated until, for example, the center of the auxiliary pile 11 rides on the surface of the main pile 2 which abuts the pile rake 9 and thus abnormal movement of the pile surface can no longer take place. Thereafter, the pull-out movement of the pile rake 9 is not interrupted by the sensor 17. The auxiliary pile 11 is finally aligned with the main pile 2 and the auxiliary pile support 6 can be lowered to a rest position next to the main pile 2.

The method can be somewhat simplified by taking advantage of experience with the behavior of certain types of paper. In this case, it is possible to start from the fact that the deflection of the auxiliary pile 11 towards the main pile 2 is completed after a certain drawing distance of the pile rake 9. This draw distance depends on the paper format, ie width and thickness. From a predetermined interval of the pile rake 9, the auxiliary pile 11 is usually bent down, that is, comes into contact with the main pile 2,
The detection of the pile level is therefore no longer necessary, and the pile rake 9 can be completely withdrawn.

[Brief description of the drawings]

FIG. 1 is a diagram of an automatic paper feeder that automatically changes piles.

FIG. 2 is a side view of the automatic sheet feeder.

FIG. 3 is a schematic diagram of an inquiry device.

FIG. 4 schematically shows the course of the method according to the invention.

FIG. 5 is a flow sheet of the method.

[Explanation of symbols]

1 automatic paper feeder, 2 main pile, 3 elevating device,
4 Individualizing device, 5 Pallet transport device, 6 Auxiliary pile support device, 7 Frame, 8 Feeding device, 9
Pile rake, 10 auxiliary pile lifting device, 11
Auxiliary pile, 12 drive, 13 holder,
14 linear guide, 15 stopper, 16 double sheet control device, 17 sensor, 18 inquiry device, 20 sheet processing machine, 22 delivery edge

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-77134 (JP, A) JP-A-2-57836 (JP, U) JP-A-51-123586 (JP, U)

Claims (5)

(57) [Claims] 1. An automatic sheet feeder for a sheet processing machine, comprising:
While lifting the main pile and auxiliary pile synchronously,
Withdrawing the support device holding the auxiliary pile in a method of combining the auxiliary pile and the main pile by pulling the support device for the auxiliary pile from the area between the auxiliary pile and the main pile approaching the same. Exercise, auxiliary pie
The level of the surface of the auxiliary pile should be a specified maximum amount from the transfer edge so that the transfer of paper sheets from the
The pulling-out movement is carried out until the support device has not been completely withdrawn and the pile surface level has moved away from the transfer edge beyond the predetermined maximum amount.
As long as the level of the pile surface is again at the transfer edge as a result of the pile lifting motion .
Restarting when the position does not exceed the predetermined maximum amount , and repeating this process until the support device is completely withdrawn from the area between the main pile and the auxiliary pile. A method for automatically changing piles in a paper feeder. 2. The support device is moved by a withdrawal movement of the support device.
The spacing between the units causes the auxiliary pile to flex and contact the main pile.
After reaching such an interval, the withdrawal movement of the support
The method of claim 1, wherein the method is not interrupted . 3. An apparatus for carrying out the method according to claim 1, wherein the main pile and the auxiliary pile are combined into one in an automatic sheet feeder of a sheet processing machine, comprising: a lifting device for the main pile; In the type having a supporting device for the auxiliary pile and a feed device for withdrawing the supporting device from the area between the auxiliary pile and the main pile, the auxiliary pile (11) or the main pile (2) on the front side is provided. A sensor (17) for detecting the level of the surface of the auxiliary pile (11) is provided in a central region of the above), and a control unit for the sensor to pull out a supporting device for the auxiliary pile (11). And an interrogation device (18) is provided, with which the pull-out movement is detected by a sensor (1).
7. Device according to 7), which is adapted to be activated or deactivated depending on the signal. 4. The sensor (17) is a pile sensor used for pile control, and the interrogation device (18) is a module for detecting an end position of the support device.
An apparatus according to claim 3. 5. The interrogation device (18) includes an auxiliary pile.
The width and thickness of the paper so that it will flex and touch the main pile
Has a memory for storing a predetermined distance between the support device dependent to be, and apparatus for detecting a withdrawal distance of the supporting device is provided, according to claim 3, wherein.