EP3687927A1

EP3687927A1 - Device for separating the lowermost sheet from a stack

Info

Publication number: EP3687927A1
Application number: EP18782306.7A
Authority: EP
Inventors: Patrick Seifert
Original assignee: Kolbus GmbH and Co KG
Current assignee: Kolbus GmbH and Co KG
Priority date: 2017-09-30
Filing date: 2018-09-17
Publication date: 2020-08-05
Anticipated expiration: 2038-09-17
Also published as: CN111032543B; CN111032543A; WO2019063126A1; EP3687927B1; DE102017009208A1; US11427416B2; PL3687927T3; US20200270078A1; ES2882200T3

Abstract

The invention relates a device for separating the lowermost sheet from a stack, comprising a magazine for receiving the stack and a push-off device (1) arranged beneath the magazine with a push-off element (14) which can be moved linearly back and forth and has a pushing edge (14.1, 14.2) movable relative to the support plane (100) of the stack in the magazine, wherein the protrusion of this pushing edge relative to the support plane effective for advancing a sheet changes.

Description

Device for separating a lowermost sheet from a stack

description

The present invention relates to a device for separating a lowermost sheet from a stack according to the preamble of claim 1. There are devices for separating stacked cardboard or the like

Material sheet known, which have a push-off device below an open-topped magazine to separate the respective lowest sheet. Such an arrangement allows at any time the refilling of sheets into the magazine without the need to interrupt the singulation process. The magazine includes support elements on which the stack rests. Lateral boundaries form a shaft which holds the stack in place and supports laterally. In order to achieve good accessibility, in particular for manual loading of the magazine shaft, the boundaries forming the slot are significantly narrower than the format of the sheets to be separated. The shaft is thus repeatedly interrupted in its circumferential direction and thus offers opportunities for intervention. Often in the magazine, a donor system for monitoring the current height of the stack attached. This allows an automated request to refill sheets before the magazine is empty, so that an uninterrupted supply of subsequent devices with individual sheets is simplified.

The push-off device comprises a slider. This detects in its linear forward movement of the bottom sheet at the rear edge, pushes it out from under the rest of the stack and passes it to a removal facility. Meanwhile, the remaining stack is held in place by the magazine shaft and stabilized. After the transfer of the

Occasional sheet to the removal device moves the slider to its starting position to capture the next sheet at the trailing edge. To do this, Schieber towers above the support elements of the magazine. The smaller this overhang is, the greater the risk of the slider undercutting the stack rather than catching the trailing edge of the lowermost sheet. Conversely, the supernatant does not exceed the material thickness of the sheet to be separated so as not to unintentionally capture several sheets simultaneously. Therefore, the

Slider often designed as a removable part to adjust the cant by replacing the slider to the arch thickness. This procedure is complicated and requires for the conversion of a machine downtime or at least a production interruption and complex safety precautions to

Personal protection.

It is therefore an object of the present invention to provide an improved over the prior art device, which overcomes at least one of the disadvantages of the prior art.

The invention achieves the object by a device having the features of patent claim 1. Advantageous developments of the invention are characterized by the features specified in the subclaims.

For receiving a stack to be separated sheet a magazine is provided. This includes a table forming support elements. The stack rests on the support plane defined by this table. To stabilize the stack, sidewalls or lateral supports can be provided in the magazine. However, these are not mandatory. The respective lowermost sheet of the stack is pushed out in a Ausschubrichtung within the support plane relative to the remainder of the stack.

In order to keep the remaining stack in its position during the singulation process, a retaining device is provided with one or more retaining elements. These retainers limit the magazine in the extension direction. The retaining elements have to the support plane at a distance such that they form a gap with the support table as a passage opening for the respective sheet to be separated. This distance is adjustable to the thickness of the bow. For a trouble-free operation, the gap slightly larger than the arch thickness selected but significantly smaller than twice the arch thickness.

Below the support plane, a push-off device is arranged, which detects the respective lowermost sheet in a conveyor-effective manner and moves it in the ejection direction. By retaining the remainder of the stack by means of said retaining means, the singling of the lowermost sheet takes place. For this purpose, the removal device comprises a linearly movable in Abschieberichtung slide. This carriage has a formed by a Abschiebelement

Sliding edge on which the support level of the magazine surmounted by a certain amount. The carriage moves parallel to the Abschieberichtung starting in a start position in a working stroke to an end position and

then back to the starting position. In the starting position of the carriage, the sliding edge has an at least slight distance from the sheet to be separated. In its forward movement, the sliding edge securely captures the trailing edge of the lowermost sheet. In the range of movement of the push-off elements or the magazine table is excluded or interrupted.

An underflow of the isolated sheet by the sliding edge on the one hand and the simultaneous removal of several directly superimposed sheet on the other hand are avoided by the supernatant of the sliding edge is matched to the support plane to the sheet thickness.

According to the invention, this adaptation is carried out by the removal element being arranged movably on the carriage in such a manner that the projection of the sliding edge relative to the support plane can be changed. This can be done in a simple manner, an adaptation of the device to different thicknesses of the sheet to be processed.

Advantageous is a rotatable mounting of the removal element in the carriage. The axis of rotation runs parallel to the Abschieberichtung. The push-off element has a contour, which depends on the rotational position of the push-off element to a different elevation of

Sliding edge opposite the support level leads. This allows a simple and compact construction of the carriage. Plus, it's easy Way reach a low-backlash and precise adjustability of the deporting element.

In a particularly simple continuation, the removal element has two or more sliding edges distributed about its axis of rotation. These sliding edges located on the circumference of the push-off element have a spacing in the circumferential direction relative to each other in such a way that depending on the rotational position of the push-off element, a single one of the sliding edges protrudes over the support plane of the magazine. In this case, the sliding edges each have different projections with respect to the support plane. This allows an easy-to-use, gradual adjustability to the arch thickness.

In order to prevent unintentional adjustment of the sliding edge, the deporting element is fixed in its rotational position. For this purpose, a resilient pressure piece is provided in the carriage, the spring-loaded ball locked in each of the sliding edges associated with lowering in the push-off. Alternatively, other known means for setting can be used such as. A clamp.

Preferably, the push-off device comprises a ZuStelleinrichtung drivingly connected to the push-off element. This allows adjustment of the sliding edge without machine downtime or production stoppage.

Particularly advantageous is a separable coupling within the drive connection. In this case, a first coupling half is attached to the removal element, and a second coupling half is stationary with respect to the Abschiebebewegung and drivingly connected to a rotary drive of the adjusting device. In particular, in connection with the setting of the deporting element with respect to its rotational position as a simple way is created to arrange the ZuStellantrieb stationary and thus not suspend the acceleration of Abschiebebewegung. The adjustment of the sliding edge takes place in a parking or set-up position of the carriage in which the clutch is automatically closed. Advantageously, a parking or set-up position outside of Work area of the sled. This will open and close the

Clutch avoided during each separation process.

In a continuation, the push-off device or at least its push-off element is adjustable transversely to the Abschieberichtung. This allows the safe separation of sheets whose width exceeds the length of the sliding edge significantly and at different positions of the center of gravity of the sheet relative to the device.

Particularly advantageous is the use of at least one other

Pushing device of the same kind with the same Abschieberichtung, the sliding edges of the devices have transverse to this common Abschieberichtung to each other at a distance. Thus, inadvertent rotation of the sheet during singulation can be prevented.

Each of these push-off devices preferably has a separate drive with a permanent drive connection to the respective slide. In this way, the deporting devices can be individually switched on and off depending on the product. Advantageous for this purpose is the use of a controllable drive, which communicates with the controller of the device via a data line.

In one embodiment, the controllable drive is formed in each case by a linear servo motor. In this case, the stator on permanent magnets, while the mounted on the carriage rotor comprises controllable electromagnets. The use of linear servo motors allows greater acceleration of the carriage and thus an increased separation performance. In addition, the use of a linear servo motor allows a simple way

Position determination of the carriage along the Abschiebichtung. In addition, the slide can be given different motion profiles due to the servo drive. These can, for example, each of the

Arc length adapted to start or a parking or set-up position outside the required for the removal movement range of the carriage include Advantageously, the device has an encoder system, which detects the angular position of the conveyed sheet to the Ausschieberichtung downstream of the retainer in the Ausschichtungichtung. This encoder system can be used for a

contactless detection a camera with appropriate image processing or photocells and is connected via a data line with the control of the device. In conjunction with controllable individual drives parallel inserted Abschiebeeinrichtungen a control of the angular position during the unifying is possible.

Of course, such a separating device may be one of several components of a sheet processing plant. In particular, it is suitable for the separation of auxiliary stacks between the cutting units of a high-performance board cutting machine.

Subsequently, the invention with reference to the figures, to which reference is made with respect to all unspecified details in the description, explained using an exemplary embodiment. The figures show:

Fig. 1 shows a device for separating a lowermost sheet in

perspective view;

Fig. 2 shows a detail of a separating device in perspective

Presentation;

Fig. 3 shows a plant for cutting cardboard sheets in perspective

Presentation.

The apparatus for separating a lowermost sheet from a stack comprises, as shown in FIG. 1, two identical removal apparatuses 1, which jointly separate a sheet in each case. The following explanations relating to a removal device 1 are to be understood in the same way for both removal devices 1.

Above the removal devices 1 is the magazine for receiving a stack of sheets. The sheet stack, not shown, rests on the table 7 formed of several sections. The horizontal support surface of this table 7 defines the support level 100. The sections of the table 7 have transverse to the Abschieberichtung 1 10 each at a distance from each other. These gaps create the space required for the removal device 1 free space. The magazine can be extended by a stack monitor, not shown.

In Abschieberichtung 1 10 limiting the magazine is above the support level 100, a retaining device 3 is provided. It comprises two retaining elements 30, which are accommodated laterally movably by means of a linear guide 32 running transversely to the Abschieberichtung 1 10. Both retaining elements 30 are each supported by a holder 31 on the common guide rail. The holders 31 are each provided with a separate

Connected to the setting device. This adjusting device comprises a spindle drive 40 driven by a controllable actuator 41.

The retaining elements 30 are attached at a distance from the supporting plane 100, so that a passage opening for the sheet to be separated results between the retaining elements 30 and the support plane 100. This distance can be adjusted by a not shown ZuStelleinrichtung known type to the thickness of the sheet to be separated.

A frame 5, each comprising a pair of cross members 50 and longitudinal members 51, receives the removal devices 1. These are mounted via linear guides 52 in a width direction 101 transversely to the Abschichtungichtung 1 10. In each case a controllable adjusting device 6 with spindle drive 53 allows an automated format adjustment in the width direction 101 transverse to the Abschieberichtung 1 10th

The push-off device 1 has a carriage 10, which is arranged by means of a linear guide 12 in Abschieberichtung 1 10 back and forth movable. The carriage 10 is driven controllably with a linear servomotor 1 1 along this linear guide 12. The rotor 1 1 .1 of the linear servo motor 1 1 is at the

Carriage 10 itself attached and connected by a data line 61 to a controller 60 of the device. The stator is made of permanent magnets 1 1 .2. The use of a linear servomotor 1 1 allows a simple way of determining the position of the carriage 10 along the Abschieberichtung 1 10. In addition, the slide 10 due to the servo drive different motion profiles can be specified. These can, for example. be adapted to the arc length or approaching a park or

Setup position outside of the required for the removal movement range of the carriage include.

The carriage 10 carries a bearing block 13, in which the push-off element 14 is rotatably mounted about an axis 140. The axis of rotation 140 extends parallel to the Abschieberichtung 1 10. The projecting into a gap or recess of the magazine table 7 push-off member 14 carries four evenly distributed around the axis of rotation 140 sliding edges 14.1, 14.2 to capture the lowermost sheet of the stack at the trailing edge effective. Depending on the rotational position of the push-off element 14, one of these sliding edges 14.1, 14.2 upwards and thus generates the required for pushing supernatant relative to the support plane 100. The respective projections of the individual sliding edges 14.1, 14.2 are different from each other, so that

Push-off element 14 by changing its effective sliding edge 14.1, 14.2 is gradually adjustable to different arch thicknesses.

To fix the rotational position of the deporting element 14 is in the

Bearing 13 a resilient pressure piece 16 is provided. The pressure piece 1 6 locked with its sprung ball in one of the respective sliding edge 14.1, 14.2 associated lowering of the deporting element 14. This is the

Pushing element 14 secured against unintentional rotation and on the other hand, if necessary, can be switched to another sliding edge 14.1, 14.2.

For this adjustment of the push-off element 14, a feed device 2 is provided. This includes a controllable positioning drive 22. The

Positioning drive 22 is connected via a data line 62 to the controller 60 of the device. The drive connection with the push-off element 14 includes a separable coupling 17 consisting of two coupling halves 17.1, 17.2.

A first coupling half 17.1 is rigidly and permanently connected to the push-off element 14 and is therefore also subject to the movement of the carriage 10. A second coupling half 17.2 is rigid and permanently connected to the Positioning drive 22 of ZuStelleinrichtung 2 connected. With regard to the

Abschiebebewegung the positioning drive 22 with the second coupling half 17.2 fixed to the push-off device 1 is attached. The second

Coupling half 17.2 includes a blade which engages in the slot of the first coupling half 17.1, while the carriage 10 along the

Abschiebichtung 1 10 is in its set-up position. By leaving this set-up position, the coupling 17 is disconnected and the drive connection between the push-off element 14 and the positioning drive 22 is interrupted.

The lower of the two push-off devices 1 shown in FIG. 1 is located with its slide 10 in a parking or set-up position, wherein the coupling 17 is closed. In contrast, the push-off device 1 shown above is located with its slide 10 approximately in a front end position, wherein the coupling 17 is opened and between the two coupling halves 17.1, 17.2 a clear distance can be seen. The device comprises two arranged on the retaining device 3

Light barriers 33. These are connected via data lines 65 to the controller 60 of the device. The light barriers 33 detect in Abschieberichtung 1 10 downstream of the retaining elements 30, the leading and the trailing edge of the separated sheet. In Abschieberichtung 1 10 at the same height, they have in the width direction 101 at a distance to each other such that they

Detecting the angular position of the leading and the trailing edges of the bow serve. This angle information allows the controller 60 by different driving the linear servo motors 1 1 a detected

Correct angular error immediately during ejection. Fig. 3 shows such a separating device as part of a cutting machine for cardboard sheets. This plant comprises a multiplicity of different devices which, apart from the described separating device 75, are all sufficiently well known, so that more detailed thereof

Description aside.

The system comprises a first separating device 71 for separating an uppermost sheet from a stack. A first transport device 72 promotes the isolated sheet to a subsequent first cutting unit 73 in a first transport direction 201 to. This first cutting mechanism 73 comprises a plurality of circular shears in order to separate the supplied sheet into a plurality of mutually parallel partial sheets. The partial sheets are combined into auxiliary stacks in a first stacking device 74 following in the first transport direction 201 and conveyed in a second transport direction 202 transversely to the first transport direction 201 into the magazine of the described separating device 75. The Abschieberichtung 1 10 of the separating device 75 is identical to the second transport direction 202 of the system. The again isolated (part) arc are conveyed without change of direction by the downstream second cutting unit 76. The first cutting mechanism 73 and the second cutting mechanism 76 are similar, and differ essentially by the number and the position of the respective longitudinal sections. In second

Transporting direction 202 is followed by the second cutting unit 76, a second stacking device 77, which summarizes the cut sheet into stacks and feeds a delivery 78, at which these sheet stacks can be removed.

Claims

claims

Device for separating at least one lowermost sheet from a stack, at least comprising

A magazine having at least one table (7) forming a support plane (100) for receiving a stack of sheets,

• a push-off device (1) arranged below the magazine with at least one slide (10) which can be moved back and forth in a push-off direction (1 10), with at least one push-off element (14) arranged on the slide (10), which has at least one push-off element

Sliding edge (14.1, 14.2), wherein the at least one

Sliding edge (14.1, 14.

2) with respect to the support plane (100) has an effective supernatant, and

• a restraint

(3) with at least one retaining element (30), which limits the magazine in Abschieberichtung (1 10) and is arranged at a distance from the support plane (100), such that the at least one retaining element (30) with the support plane (100) Gap forms, through which at least a lowermost arc of the stack is feasible, wherein the gap and thus the passage height are adjustable,

characterized in that the at least one sliding edge (14.1, 14.2) of the at least one push-off element (14) relative to the

Support level (100) of the magazine is movable, with the

promoting overhang of the at least one sliding edge (14.1, 14.2) relative to the support plane (100) changed.

Apparatus according to claim 1, characterized in that the

at least one push-off element (14) of the at least one

Pushing device (1) in a receptacle of the at least one carriage (10) about an axis (140) is rotatably disposed, said axis of rotation (140) to the Abschieberichtung (1 10) is arranged substantially parallel.

Device according to one of the preceding claims, characterized

in that the push-off element (14) is so around its Rotary axis (140) distributed at least two sliding edges (14.1, 14.2) has, that according to the rotational position of the Abschiebeelementes (14) about its axis of rotation (140) exactly one of its sliding edges (14.1, 14.2) has a promoting effective overhang against the support plane (100).

4. Device according to one of the preceding claims, characterized

characterized in that in the at least one push-off element (14) and / or in each case at least one clamping element and / or latching element (1 6) is provided which fixes the push-off element (14) in a predetermined rotational position.

5. Device according to one of the preceding claims, characterized by a first ZuStelleinrichtung (2) with at least one controllable drive (22) which is at least temporarily so in drive connected to the at least one push-off element (14), that the at least one controllable drive (22). the rotational position of the respectively assigned

Deporting element (14) determined.

6. Apparatus according to claim 5, characterized by at least one

Separable coupling (17) of the first adjusting device (2), wherein a first coupling half (17.1) is arranged on the at least one push-off element (14) such that the first coupling half (17.1) is rigidly connected to the push-off element (14) with respect to the axis of rotation (140) ) Is connected and that this first coupling half (17.1) together with the

Pushing member (14) performs the Abschiebebewegung, and that a second coupling half (17.2) of the same coupling (17) about the axis of rotation (140) of the push-off element (14) rotatably mounted on the frame of

Pushing device (1) is arranged, such that the second

Coupling half (17.2) is arranged stationary with respect to the Abschiebebewegung.

7. Apparatus according to claim 6, characterized by an arrangement of the stationary with respect to the Abschiebebewegung second coupling half (17.2), such that the closing of the coupling (17) by one of

Abschiebebewegung opposite movement of the carriage (10) in the Start position of his Abschiebebewegung and / or in a position outside of the Abschiebebewegung of the carriage (10) position takes place.

8. Device according to one of the preceding claims, characterized

in that the at least one push-off device (1) is arranged movably in a feed direction (101) transversely to the push-off direction (110).

9. Device for separating at least one lowermost sheet from a stack, at least comprising

A magazine with at least one support plane (100) forming table (7) for receiving a stack of sheets and

• A retaining device (3) with at least one retaining element (30), which limits the magazine in Abschieberichtung and at a distance from the support plane (100) is arranged, such that the at least one retaining element (30) with the support plane (100) has a gap forms, through which at least a lowermost arc of the stack is feasible, wherein the gap and thus the passage height are adjustable,

characterized by at least two push-off devices (1) according to one of the preceding claims, wherein the at least two

Pushing devices (1) each have a separate with the respective carriage (10) permanently drive-connected drive (1 1).

10. The device according to claim 9, characterized by an arrangement of at least two push-off devices (1) transversely to the common Abschieberichtung (1 10) distributed over the width of the sheet to be separated such that the push-off elements (14) of the at least two

Pushing devices (1) collectively the same sheet promoting effective capture to him together in the Abschieberichtung (1 10) to separate.

1 1. Apparatus according to claim 9 or 10, characterized in that the separate drives (1 1) of the at least two push-off devices (1) controllable and connected by means of data lines (61) with a controller (60) of the device.

12. Device according to one of claims 9 to 1 1, characterized in that the at least two separate drives (1 1) each having a linear motor, wherein in each case the stator (1 1 .2) of the linear motor

Permanent magnet is formed and in each case the controllable rotor (1 1 .1) on the carriage (10) is arranged.

13. Device according to one of claims 9 to 12, characterized by a downstream of the at least one retaining element (30) arranged and by means of at least one data line (65) with the controller (60) of

Device connected encoder system (33) for detecting the angular position of the separated sheet with respect to the Abschichtungichtung (1 10).

14. Plant for cutting sheets of cardboard and / or cardboard, at least comprising

• a first separating device (71) for separating a sheet from a stack with at least one transport device (72) with a first transport direction (201) for feeding the separated sheet into

• a downstream of the first separating device (71) arranged first cutting unit (73) with at least one circular shear for dividing the supplied sheet into a plurality of partial sheets, the axes of rotation of the at least one circular shear forming circular blades are arranged substantially transversely to the first transport direction (201) .

• a downstream of the first cutting mechanism (73) arranged

Stacking device (74) for forming auxiliary stacks from the partial sheets,

• a second downstream of the stacking device (74) arranged

Separating device (75) for separating a lowermost sheet from the auxiliary stack according to one of the preceding claims, wherein the Abschieberichtung (1 10) of the second separating device (75) transverse to the first transport direction (201),

• one in Abschieberichtung (1 10) downstream of the second

Separating device (75) arranged second cutting unit (76) and

• a downstream of the second cutting mechanism (76) arranged display (77).