JP2583752B2 - 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. Control of the proper position for bringing together the auxiliary pile and the main pile consists of at least two lift sensors (Auflaufs) in at least one of the rake rods of the supporting rake.
ensoren). The ride-on sensor is designed, for example, as a blowing nozzle, in which case one nozzle must be upward and the other downward. The blowing nozzles respectively react to the closing of the auxiliary or main pile approaching from above and below by the paper surface. In this way, subsequent method steps can be introduced.

A disadvantage of the above arrangement is that the sensors may react at different positions relative to the pile depending on the surface configuration of the paper pile. This is especially the case for the main pile coming from below. As a result, the position at which the auxiliary pile is picked up by the main pile is not defined, which hinders automatic pile replacement. Placing the blowing nozzle with the necessary blowing air supply on it in the rake rod is relatively cumbersome and the blowing nozzle is prone to contamination.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to combine a main pile and an auxiliary pile under one and the same condition at all times, and to be simple, strong and resistant to dirt.
Finding methods and apparatus.

[0005]

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

[0006]

The provision of a simple switching contact on the support rake ensures that the main pile arrives at the auxiliary pile at the minimum possible distance. The unevenness of the pile surface of the main pile is no longer important, because when it arrives, it always rests snugly on the underside of the auxiliary pile or on the supporting rake.

[0007]

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.

FIG. 2 shows the feeding device 8 in detail. The rod of the pile rake 9 is fixed in the holder 13,
And at the rest position outside the pile rake. The movement in the pile area is effected by the drive 12 running on a linear guide 14 using a chain transmission. The entire device is an auxiliary pile elevating device 10
Is movable in the vertical direction.

FIG. 3 shows the details of the holder 13 of the pile rake 9. Here, for example, the arrangement of a device for inquiring the load state of the auxiliary pile support device 6 is shown. The device is based on the detection of the relative position of the pile rake 9 with respect to a linear guide 14 for guiding the pile rake 9 in a horizontal direction and based on the gravity of the auxiliary pile 11,
Utilizes the light elastic deflection of the support member. Of course, to directly measure the parallelism of the pile surface, depending on the distance between the pile surfaces, for the measurement of the relative position of the pile rake 9 with respect to the horizontal, or at a certain level the main pile at the center between the auxiliary pile supports 6 A device for detecting the arrival of the second is possible. It is important that the surface of the main pile 2 abuts the member supporting the pile rake 9 or the auxiliary pile 11 in each case. In the illustrated example, a pile rake bar is fixed to a traverse 15, and the traverse is mounted on a linear guide 14. A sensor technology device 16 is coupled to the traverse 15, which detects the relative position of the traverse 15 with respect to the linear guide 14. The sensor technology device 16 is, for example, the microswitch 1
7, which is mechanically arranged between the traverse 15 and the linear guide 14. The wiring is performed via the interrogator 18, which is also the main pile 2
Is connected to the control unit of the lifting device 3. The microswitch 17 is arranged such that it is closed when the pile rake 9 is raised. This can be done in the elastic area of the traverse 15. The signal thus generated is used for pile control.

FIG. 4 shows the method sequence according to the invention step-by-step in partial views a), b) and c).

A) When the main pile 2 is aligned in the automatic sheet feeder 1, the main pile is lifted in the direction of the auxiliary pile 11.

B) The main pile 2 is moved towards the pile rake 9 until the sensor technology device 16 responds.

C) The pile control is actuated so that the macro switch 17 is opened again. This can be done by lowering the main pile 2. It is also possible to stop the main pile until the microswitch 17 is opened by the lifting movement of the auxiliary pile lifting device 10.

FIG. 5 shows the process again using a flowchart, in which the arrangement of the pile rake 9 and the auxiliary pile 11 is shown in parallel. The ascending movement of the main pile 2 is first performed by an express train until the pile surface reaches the vicinity of the auxiliary pile 11. The approach then takes place slowly, with the interrogation of the microswitch 17 being activated. This is done to detect only obvious situations under load,
This is not performed in the pile rake 9 in the non-load state. As long as the microswitch 17 does not respond, the main pile 2 is slowly lifted. When the microswitch 17 responds, the function "reach auxiliary pile" is announced. The pile rake 9 is lifted in the elastic area of the device, which is detected by the traverse 15. This means that the main pile 2 is now in full contact with the underside of the pile rake 9 since the pile rake 9 must be lifted slightly or its gravity removed. . The piles are therefore located parallel to each other. This is a prerequisite for uninterrupted pile merging. This time, the lifting device 3 of the main pile 2 is stopped. To reduce pile coalescence, the pile rake 9 must again be removed from the pressure of the main pile 2. For this purpose, the main pile 2 is lowered until the signal "pile rake load" is generated by opening the microswitch 17 due to the gravity of the auxiliary pile 11. The piles are then lifted synchronously until the piles are aligned.

The last step of the method for producing the signal "pile rake load" is to lift the main pile 2 until the lift pile is synchronized with the auxiliary pile 11, and the pile rake 9 causes the load of the auxiliary pile 11 to rise by the raising movement of the auxiliary pile 11. Can be lowered again and stopped until the microswitch 17 responds accordingly.

[Brief description of the drawings]

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

FIG. 2 is a view of a feed device of a pile rake.

FIG. 3 is a detailed view of a pile rake holder.

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 traverse, 16 sensor technology device, 17 micro switch,
18 inquiry device

Claims (6)

(57) [Claims] 1. An automatic sheet feeder for a sheet processing machine, comprising:
In a method of combining the auxiliary pile and the main pile by bringing the main pile closer to the auxiliary pile supported by the auxiliary pile elevating device, the main pile is moved with respect to the lower surface of the supporting device holding the auxiliary pile. Detect the load on the support device, stop the upward movement of the main pile after unloading the support device in the direction opposite to the direction of gravity, and add a distance auxiliary pile just enough to load the support device again. Moving the main pile away from each other, and then synchronizing the upward movement of the main pile and the auxiliary pile,
A method for automatically changing piles with an automatic paper feeder. 2. The method according to claim 1, wherein after unloading the support device, the main pile is lowered a distance just such that the support device is reloaded. 3. The method according to claim 1, further comprising, after unloading the support device, stopping the main pile until the support device is reloaded as a result of the lifting movement of the auxiliary pile. 4. An automatic sheet feeder for a sheet processing machine, wherein a main pile and an auxiliary pile are combined into one.
3. A device for carrying out the method according to any one of claims 1 to 3, which comprises a lifting device for the main pile and a support device for the auxiliary pile. ) Has a device for detecting the load of the device supporting the auxiliary pile (11), and the device for detecting the load is connected to the control unit of the lifting / lowering device (3) of the main pile (2). An apparatus characterized in that it is possible. 5. A holder (13) for a pile rake (9) is arranged on each of the linear guides (14) in the auxiliary pile support device (6), and the microswitch (17) is a linear guide ( 5. The device according to claim 4, wherein the device is connected to the holder (13) so that a relative position of the holder (13) with respect to the load direction, perpendicular to the direction of movement of (14), can be detected. 6. An auxiliary pile supporting device (6), wherein a device for detecting a parallel position with respect to a horizontal position of a pile rake (9) supporting an auxiliary pile (11) is arranged, and a main pile (2). Device according to claim 4, which is connectable to a control of a lifting device (3).