DE2201254A1 - Device for transporting sheet material - Google Patents

Description

PATENTANWÄLTE DipUng. MARTIN LIGHT

Dr. REINHOLD SCHMIDT

PATENTANWÄLTE LICHT, HANSMANN, HERRMANN

β Munich 2 THERESiENSTRAssE 33 Dipl.-Wirtsch.-Ifig. AX E L H A N S M A N N

Dipl.-Phys. SEBASTIAN HERRMANN

Munich, January 12, 1972

ι Your mark Our mark

Ho / Lü

HAÜRIS-INTERTYPE COltPOitATION 55 Public Square
Cleveland, Ohio

V. St ₀ Ao

"Device for transporting sheet material"

The invention relates to a device for transporting sheet material, such as corrugated cardboard in individual pieces. The corrugated cardboard sheets can be located in a container and are fed to another device, such as an L-ruc-kschlitzer. The stack of sheets remaining in the container lies on a table. The bottom sheet or »the bottom sheet rests on strips and is moved with the help of a sliding plate, which rests on one end of the sheet,

A pile of sheets or bows to be conveyed is thrown through vacuum chambers are located on the stationary table-borne vacuum chambers below the table. Air vents located in the table »S are in connection with the vacuum chambers. At least

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some of the vacuum chambers can optionally be equipped with a plenum chamber be connected., This in turn is connected to a pump to the collection chamber evacuate, the possibility of relating the pressure in a chamber Controlling another chamber has the advantage of the effect of the negative pressure on the particular size of the sheet to be conveyed and on a certain surface area to be able to put down an uneven sheet.

The vacuum or negative pressure chambers are used to keep the sheet of paper flat on the table To create strips. The support strips reduce the contact with the leaves on the leaves to a minimum, so that the flattened leaves can be conveyed regardless of the fact that they are each the lowest Sheet in the stack.

Conveyor devices of known type working with negative pressure work primarily with movable elements. In the device according to the invention, the vacuum chambers and the table are stationary. As a result, the need to move large masses is reduced to a minimum. The construction and maintenance are simplified and large sheets of paper can be transported with a minimum of friction with the support strips _{or the like}

By using several vacuum chambers, the leading and trailing edges of the respective leaf or bogei can be flattened werdena The main purpose, depending on the size of the dowel to be conveyed, only a few certain vacuum chambers to use, consists in the fact that at maximum conveying speed a destruction on the lower edge of the sheet should be avoided.

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The device geinäss of the invention features advantageously characterized in that for the maintenance work is very little downtime is required _o operating at conventional Blattfordergerätenj with a urucksehlitzer must periodically stop be made for the entire plant, to the accumulating on the üruckwerkzeugen dust wipe, the vacuum effect of the device according to the invention cleans the surrounding air so that far less dust can collect on the pressure tools. The device can therefore be operated for about twice as long as known devices before cleaning is required.

The object of the invention is to create a conveying device which operates with negative pressure and which can also convey discarded or uneven sheets and sheets. The sheets should be able to be moved with a minimum of friction., Depending on the sheet size of the negative pressure to the suction or _o should at different surfaces of the sheet can be selectively applied.

The conveyor device according to the invention works with a novel sliding plate, which is located on the conveyor table Strip is out and provided on the top with recesses, which receive acting as a breaker approaches. The use of the device according to the invention enables associated equipment to be operated for longer, without having to stop operation for cleaning or maintenance.

The invention is embodied in a sheet feeding device Floor conveying ο Stationary vacuum or i * vacuum chambers serve to flatten the sheets before they are passed on to the conveyor system. Some of the vacuum chambers are equipped with plate

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or Versciilusskkörperern provided, which the pressure effect on control the adjacent part of the sheet.

The invention is explained using an exemplary embodiment with reference to the accompanying drawings »

Fig. 1 is a partial perspective view of a conveyor device according to the invention;

Fig '2 is a sectional view of line 2-2 in Figure 1 _o;

Fig. 3 is a sectional view taken on line 3-3 in Fig. 2;

Fig. 4 is a sectional view taken on line 4-4 in Fig. 3;

Fig. 5 is a sectional view taken on line 5-5 in Fig. 3;

6 is a plan view of a section of a table on an enlarged scale; and

7 is an enlarged sectional view of a detail the sliding plate showing the load-bearing strips and the approaches.

Fig. 1 illustrates a partial perspective view of the sheet feed apparatus 10 according to the invention _o The device lu comprises a table 12 on which an underlying housing 14 is associated. The housing 14 is formed by an underside 16, a front wall 18 and a rear wall, side walls delimiting the sides of the housing.

Downwardly extending flanges 22, 24, 26 and 28 are provided on table 12, as illustrated in FIG. 2 is. The flange 22 acts essentially with the rear

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Wall 20 together. The housing 14 is on the flanges 22 and 28 connected to the table 12.

A flap 30 is pivotable on one located on the flange 22 The bar is hinged and cooperates with the flanges 22 and 24 to form a chamber 32. Corresponding a flap 34 is hinged to the flange 24 and acts with the Flanges 24 and 26 together to form chamber 36. Chamber 36 is parallel to chamber 32 »

A flap 38 is pivotable on one of the flange The flap 38, attached to the horizontal plate extending to 28, cooperates with the flanges 26 and 28 to form the chamber 40 to form. The flange 28 forms a chamber 42 with the front wall 18 of the housing 14. The table 12 forms the Top of each of chambers 32, 36, 40 and 42.

A collection chamber 44 is provided below each of the chambers 32, 36, 40 and 42 in the housing 14. The chamber 40 is always in open communication with the collection chamber 44 _O. The chambers 32, 36 and 40 can optionally be brought into communication with the collection chamber 44, whereby the pressure in the chambers 32, 36 and 40 can be varied with respect to the pressure in each of the chambers is.

With the help of a device, a negative air pressure is created in each This device is below of the housing 14 and advantageously provides a reading part of the device 10, instead of being used as an additional device, which must be attached separately is to The suction device 46 preferably consists of one motor-driven fan, which via an opening 48 to the bottom i6 is connected to the summing chamber 44,

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The table 12 is provided with a plurality of bores 50 which are in communication with each of the chambers. A perforated screen 52 lies above the table 12. The screen 52 is provided with a plurality of elongated openings ^ k which are smaller than the bores 50, whereby a plurality of openings 5 ^ are above each of the bores 50. This can be seen from Figure 6 of the drawings.

The bores 50 can have a diameter of 19 mm, so that there is a large throughflow channel into the chambers 32, 36 etc. for the air. The openings 5h can have a length of approximately 12.7 mm and a width of approximately 3 »1 mm. In this way, the openings 5 ^ are small enough to prevent an operator from getting into one of the bores 50 with his finger. The sieve 52 thus performs a safety function.

The flap 30 is optionally operated with a rod 58. The flap 3k is operated with a rod 6 and the flap 38 is operated with a rod 60. The rods extend through a downwardly directed flange 62 on the underside of an extension 66. The table has projections 64 and 66 on the opposite sides of a pivot plate 68.

The table 12 is with two independently existing Chamber systems equipped with associated suction means. The structural relationship or location according to FIG. 2 is at the reproduced right side of the table shown in Figo i. A completely independent but identical one System is on the left side of that shown in FIG Table and is partly reproduced in section,

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The system of chambers and valves on the left is equipped with eiitsprcciieiiuen leather case, which reference wear lines o

The vacuum chambers have the shape of iieiIien transversely of expanding chambers, For example, the Chambers 32 and 32 'and extend across the table 12, although they are separated from one another by a web 33. The web 33 is in the middle along the table 12 arranged.

Their parallel and support strips 70 are releasably provided on the table 12 and are above the perforated screen 52. Sheets to be conveyed are below soffit held on the strip 70. The strips 70 decrease the information contact on the sheets to be föx'dernden in the Compared to the sheet support on the perforated screen 52 or with respect to a direct support on the table 12. The sheets are with the aid of a sliding plate 72 along the top the strip 70 moves. The sliding plate 72 has a sliding surface 74, which at the rear edge of the lowermost Sheet of a stack of sheets and which pushes this sheet. The sliding plate 72 is in the direction of Strip 70 reciprocable.

The sliding plate 72 is sometimes referred to in the trade as a conveyor plate. In order to achieve an adaptation to the strips 70, the sliding plate 72 is provided with recesses or grooves 73 on its underside. Each of the strips 70 extends into one of the grooves. The sliding plate is also provided on its upper side with grooves 75, whose purpose will be explained below, the _o applied to the leaf surface of the Ik · slide plate 72 is made as a result of a series

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at a distance from one another located contact surfaces, which in a plane immediately above the top of the strips 70 come to rest »

The conveying or sliding plate 72 is guided so that it can be moved back and forth parallel to the strips 70 with the aid of guide rods 76 and 80. The guide rod 76 is located in a longitudinally extending slot 78, while the guide rod 80 is provided in a longitudinally extending slot 82. The slots 78 and 82 are located both in the main part of the table and in that part of the table which has the projections 6k and 66 o

The guide rod 76 has a connection part which is pivotably attached to one end of a rod 8k . The other end of this rod 84 is pivotably attached to a crank lever 86, as can be seen from FIG. The crank lever 86 is fixed to a shaft 88 and rotatable with it. The guide rod 80 has a connecting part attached to one end of the rod 90 so as to be pivotable. The other end of the rod 90 is pivotably attached to a crank lever (not shown) which is connected to the shaft 88. The shaft 88 may Patent ₀ 2 181 2il will perform reciprocating movements described manner or actuated in any other conventional manner in the U, S, in order to achieve the sliding plate above the strip 70 that forward and backward moved.

The table 12 represents the underside of a feed container. Detachable lateral guide plates form parts of the container and are adjustable along a support body 92.

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A pair of sliders 9k are similarly adjustable along the body 92. The lower end of the sliders 9k are spaced from the top of a perforated plate which is arranged at the front end of the table 12a. The slider forms a gap 96 with the top of the plate, which allows one sheet to be fed to the conveyor rollers 98, which feed the sheet to the pressure roller of a pressure slitter, the cutting roller of a stencil cutter or punch, etc.

The gap in the conveyor rollers 98 is horizontally aligned with the Gap 96 and is close to this so that the sliding plate 72 only has to push a short distance on the bottom sheet. Uni to ensure that the leading edge of the sheet remains flat, the chamber 42 is always connected to the collecting chamber 44. If the leading edge of the sheet is slightly behind is bent at the top, the suction from the chamber 42 is sufficient to lay it flat so that it passes through the gap 96 can.

The rear end of the container is formed by the stop 100. The rear stop 100 consists of a essentially vertical plate, which rests against the rear end of a stack of sheets and which with its lower part edge is arranged at a distance from the table "The distance corresponds to the thickness of several sheets",

The stop 100 is with ailfe of struts 104 on a Base 102 held. The struts 104 extend at a distance from one another along the stop »A wave IO6 becomes held by the struts 104 and is rotatable about its longitudinal axis. Breaker bodies 110 are spaced along the shaft 106 attached to this. Each of these interrupter bodies J10 endcfc at its free end into a thin extension 108,

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which is guided in the notch 75 on the top of the sliding plate 72 “The top of the projection 108 lies in a plane which is provided somewhat below the plane of the surfaces 74 of the sliding plate 72 which bear against the blade. The lugs 108 are therefore in a plane which is provided somewhat below the underside of the lowermost sheet is.

The shaft 106 is over a limited arc range about its longitudinal axis rotatable ₀ to twisting of the shaft is a manually operable lever, a solenoid, etc. "used in the illustrated embodiment of the invention is a pneumatic cylinder used 112 whose piston rod is articulated to a lever 114 . This is connected to the shaft 106. By appropriate actuation of the cylinder 112, the interrupter bodies 110 are pivoted in the direction of the arrow 116, as shown in FIG. 4, and lift the blades over the surface 74 of the sliding plate.

The position of the stop 100 can be optionally adjusted depending on the size of the sheets to be conveyed. The adjustment of the stop in ltichtung the slide facing away from 94 and from this is done as follows: the guide slots 118 and 120 of the table 12 are also in the part provided, on which the projections are 64 and 66 »A first manually operable friction or _o clamping closure 122 is attached to the base 102 and extends into the slot 118. A corresponding manually operable clamping lock 124 is attached to the base 102 and extends, when the KlemmaBchlbsser relieved or in the slot 12O _0, are dissolved, the stopper and the associated can Components can be manually moved forwards or backwards to the desired position. The clamps or clamp locks are to be regarded as known per se.

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and do not require a detailed description,

The swivel plate 68 is equipped with the strips 70 comparable and with these aligned strips serving for support. Since the swivel plate 68 is not permeable, the swivel plate and the strips serving for support form a channel with the sheet to be conveyed through which air must flow into the bores 50 when the stop 100 is offset far enough backwards. In this way, the sheets lie over part of the pivot plate 68. When small sheets are to be conveyed, the pivot plate can be pivoted downwards so that the operator has access to it. Oh the front end of the table 12 and below the projections and 66 having area is provided, the table having a plurality of holes 126 which correspond with the bores 50 ₀ Among them is a single vacuum chamber and communicating with either of the chamber hh in combination or with a separate The bores 126 are arranged in such a way that the leading edge at the corners of longer sheets remains flat. The sheets to be conveyed are shown in FIG. 2 with reference number 128.

The device 10 geinass of the invention is used as follows:

The components adjustable by the body 92 are adjusted in such a way that they form the ends of a container which is suitable for receiving sheets 128 of a certain size. The slide 3h form the front end of the feed container o The stop 100 is adjusted to match the size of the sheets 128 and forms the rear end of the container Area lh below or slightly back

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ter the stop 100 comes to rest and a sufficient Has stroke to move the sheets into the gap between the conveyor rollers 98 »

Subsequently, the rods 56, 5 8 and 60, 56 are '58' and 6O ¹ is operated to bring the various flaps 30, 34 etc. in their appropriate position. This leads to a dimensioning of the suction effect in accordance with the leaves to be conveyed. If the leaves extend, for example, from the flange 24 to the slide 94, the flaps 30 and 30 ^{1 are moved} into a closed position because they come to lie outside the circumference of the leaves « If the length of the leaves is less than the distance between the holes or openings 126 of each edge at the front end of the table 12, the suction device for the openings 126 or a flap in a conduit between the openings 126 and the adjacent plenum 44 or 44 will be used 'in a closed position, ie in a rest position, relocated. It is assumed that the slides 9k have been brought into a position in which the gap 96 is somewhat larger than the thickness of a single sheet corresponds,

If the sheets to be conveyed are deformed or warped, particularly in the middle part, the flaps Jk and 38 can be opened further in order to trigger maximum suction within the chambers 36 and 40. If the leaves lie flat in the region of the chambers 36 and 40, a minimal suction can be triggered when the flaps 38 and 42 are pivoted into the partially closed position.

The device 10 can then be put into operation by means of suitable switches in order to activate the suction device 46, 46 'etc. to turn on and to make the shaft 88 pivot movements. When the slide plate 72 moves in the direction of Conveyor rollers 98 and moved away from these, the

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Sheets 128 one at a time from the bottom of the stack If it is desired to suspend transport, the cylinder 112 is actuated to move through the lugs 108 to raise the rear end of the stack by an amount exceeding the thickness of the sliding plate 72. In this way, no sheet is conveyed during the subsequent and subsequent work cycles of the SchJEbeplatte 72, until the approaches are lowered into their normal position shown in FIG. In this position are the lugs 108 slightly below the top of the supporting strips. 70. The leaves are in transit carried by the strips 70 which form channels. By these channels, air can be sucked into the bores 50,

The operation of the device 10 has the consequence that the maintenance on the devices receiving the sheets on a Minimum can be reduced. The switch-off time to shut down of printing plates or the like can be reduced considerably and is an unexpected benefit of the Device 10 is. If the sheets 128 are of sufficient size have so that the stop 100 with respect to the conveyor rollers 98 must be moved rearward to a position in which the trailing edge of the blades 128 is above the pivot plate 68, the trailing edge can be held substantially flat against the strip 70, although there are no bores 50 are provided in this area of the table »By the Sheet 128 at the top, the pivot plate 68 at the bottom and through the side strips 70 becomes a Channel formed through which air is sucked in and the trailing edge of the sheet in an advantageous manner on the strips 70 holds *.

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As shown in the drawings, every groove is aligned 75 on the sliding plate 72 with a suction channel, this being formed between adjacent strips 70. Every Groove 75 stands through one of the interruptions in surface 74 of the sliding plate with one of the suction channels in each case Link. Since the bottom sheet through the surface 74 den Shaft 98 is entered, the trailing edge of the next sheet in the bin is replaced by the one in the grooves 75 Vacuum sucked down. This has the advantage that the next sheet can be used as a device to to prevent the trailing edge of the sheets to be conveyed from lifting up from the surface 74.

The effect of the negative pressure on the table 12 means that the sheets to be conveyed can be of the greatest size over the entire length a suction can be created. The gap can be reduced to a minimum with the aid of a protective part 95 (FIG. 2) in order to obtain increased safety for the operating personnel. In known devices this is missing a suction effect existing over the entire length of the leaves that the gap on the protective part 95 is kept large enough to accommodate bent or twisted sheets. This gap size corresponded no longer the security conditions. The sliding plate 72 is preferably provided with wear buttons or wear plates equipped, which rest on the top of the rails 70 to ensure a reliable and trouble-free To guarantee work and to reduce the exchange of sliding plates to a minimum. As the approaches 108 move the breaker with the stop 100, they can be used effectively on sheets of any size. Due to the suction effect of the conveyor table according to the invention, high working speeds can be run, even when the leaves are raised. The vacuum hold-down

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Effect also ensures better sheet guidance and sheet input to the conveyor rollers 98.

Each of the flaps 30 »3 ^ etc. is pulled downward by gravity and by suction in the collection chambers. The downward pull on "the flaps is counteracted by a link hinged to the side of the housing". The flaps rest on one end of the link while the other end of the link is hinged to one end of each of the rods 5 & J 58 etc., as can be seen from Fig. 2 and the drawings.

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Claims (1)

- Ιό - PATENT CLAIMS: I ₀ J Device for transporting sheet material from the underside of a container to a pair of conveyor rollers using a stationary support as the container bottom, with a reciprocating viewing plate, which moves the bottom sheet in each case from the container over the support and enters the conveyor rollers , and with a device assigned to the support, which exposes the lowermost sheet to be transported to a negative pressure which smoothes discarded sheet parts, characterized in that the stationary support (12) has stationary support strips (70) which lie against the respective lowermost sheet and which form suction channels between them which run parallel to the direction of movement of the viewing plate (72). 2o device according to claim 1, characterized in that that the viewing plate (72) on its upper side has grooves (7ί>) has, which are each aligned with one of the suction channels, so that the trailing edge of the next sheet to be conveyed goes down while the bottom sheet is being transported is pulled » 3. Device according to claim 1, characterized in that that the ends of the suction channels that are remote from the conveyor rollers (98) are open to the exhaust air. - 17 209840/0081 H. Device according to claim 1, characterized in that the underside of the sliding plate (72) is stranded with hats (73) into which the support strips (70) extend, so that the top of the support strips directly on the contact surface (7 ^ ) adjoins the sliding plate (72) » ■ -! I. 2Ü9840 / 0081