KR20090028837A - Auxiliary drive unit for transferring sheet on feed table of die cutting press - Google Patents

Abstract

A secondary drive for a sheet-like article processing machine of the type comprising a feed table equipped with at least one lower drive belt 11 for conveying the layer 3 of the sheet-like article. The auxiliary drive device includes a frame arranged over a supply table of the processing machine. The frame,

At least one upper drive belt 15 configured to cooperate with the lower drive belt (s) 11 to apply a pressing and driving force to the upper surface of the layer 3 to transport the layer 3 of the sheet-like article,

Support mechanism for driving the upper drive belt (s) 15, which is configured to drive the upper drive belt (s) 15 in synchronization with the lower drive belt (s) 11.

The invention also relates to a sheet-like article processing machine of the type comprising a feed table equipped with at least one lower drive belt 11 for conveying a layer 3 of sheet-like article, comprising the auxiliary drive device. .

Description

AUXILIARY DRIVE FOR CONVEYING SHEETS ON THE FEED TABLE OF A DIE-CUTTING PRESS}

The present invention relates to an auxiliary drive for conveying sheets of paper or cardboard arranged in layers on a feed table of a cutting press.

In a cutting press known so far, in one example of the cutting press schematically shown in FIG. 1, the sheet to be processed is taken out from the top of the stack 1 and arranged in the form of a layer 3, and then the transfer of the press cutting station. It is conveyed on the feed table before entering into the gripping portion 4 of the member 5. Thus, EP 1170228 describes an example of a sheet-by-sheet supply apparatus for arranging the sheets in a layer form, and EP 0680906 describes a press using a phage bar. One example of a conveying member of a cutting station is described.

The arrangement of the sheets in the form of layers and the feeding of these layers is shown in more detail in FIGS. 2 and 3. The layer 3 is supplied from the laminate 1 by the suction unit 2, and the upper portion of the laminate 1 is of a constant height by raising the laminate support plate 6 driven by the motor 7. Is kept on. The sheet 8 at the top of the stack 1 is pushed forward after being gripped by the suction unit 2 at the rear to form a layer 3, and the front portion 9 of the sheet 8 is Slides just below the seat 10.

The sheet of layer 3 is positioned very accurately in the longitudinal and lateral directions by means of a positioning device (not shown). European Patent Document 0669274, European Patent Document 1044908, and European Patent Document 1151833 describe examples of an apparatus for positioning a sheet forming the layer (3). As described in the patent document, the positioning operation is carried out at one of both ends of the feed table, and also by the front and side stops on which the edge of the sheet to be introduced into the press cutting station is placed or the sheet is stopped. Can be achieved using a more sophisticated system.

The feed table known so far comprises an inclined platen 12 which can be, for example, a metal plate or a wooden board, which generally serves as a support for the top of one or more drive belts 11. If there are several belts 11, they are arranged side by side over the width of the inclined surface 12, so that the inclined surface supports the top of each of the belts 11.

In order to convey the sheet of layer 3 to the feed table 12, at least one upper auxiliary pressing element 13 is often used. The upper auxiliary pressing element (s) 13 are mounted to the frame so that they can be positioned above the drive belt or each drive belt 11. This upper auxiliary pressing element 13 is mostly composed in the form of a sliding block, a roller or a small belt conveyor, and the pressure of this pressing element exerted on the layer 3 of the sheet to be conveyed can often be adjusted. An example of the upper auxiliary pressing element 13 is described in EP 0684201. Using positioning by contact with the stop, often a rotating brush is used, which is positioned so that the bristles of the brush bend when the front edge of the first sheet of layer contacts the stop, Prevents damage to the edges of the sheet due to excessive brusque pushing by the conveying member.

In the known device, only the auxiliary pressing element 13 has the function of pressing against the layer 3, so that this layer is flattened with respect to the drive belt or the top of each drive belt 11.

Friction is a crucial parameter in the driving force of the layer (3). In addition, in order to ensure the accurate conveyance of the low weight paper, the drive belt for the sheet or the top of each drive belt 11 projects only slightly beyond the surface of the inclined surface 12.

When the sheet is not made of a flexible material such as paper or cardboard of low weight and has a very slippery surface, as shown in FIG. 5 for an apparatus comprising two drive belts 11, layer 3 Contact between the top of the belt 11 and the top of the belt 11 is not sufficient to ensure accurate and constant transfer of the layer 3. This occurs especially in sheets of corrugated cardboard which are glued together. Therefore, it is necessary to considerably increase the pressing force Fv of the upper auxiliary pressing element 13, which in some cases results in local compaction of the corrugated cardboard which is unacceptable today.

It is an object of the present invention to solve the above-mentioned drawbacks to accurately carry out the sheeting without damaging any material.

To this end, the present invention relates to an auxiliary drive device for a sheet-shaped article processing machine according to the description of claim 1, and also to a press for cutting a sheet-shaped article according to the description of claim 7.

The invention will be better understood with reference to the preferred embodiments, which are provided in a non-limiting example manner and are also illustrated by the accompanying drawings.

1 is a schematic view of a conventional cutting press,

2 is a schematic view of different stations of a conventional cutting press,

3 and 4 are schematic views of a conventional apparatus for arranging sheets and feeding the layers in the form of layers,

FIG. 5 is a schematic diagram showing the problem occurring in some cases with a high weight sheet-like article in a conventional apparatus; FIG.

6, 7 and 8 show different schematic views of the device according to the invention,

9 is a view of one embodiment of a drive mechanism of a device according to the invention.

In terms of terms, in order to avoid any confusion in the description below, the terms "upstream" and "downstream" are defined with respect to the direction of movement of the sheet in the form of a layer. This layer moves from upstream to downstream along the main axis of the machine. In addition, the terms "longitudinal" and "lateral" are defined with respect to the main axis of the machine, and the term "sheet-like article" is considered to be equivalent to the term "paper or cardboard sheet", which is not directly related to the present invention. It is also intended to avoid cluttering the description by referring to details of construction well known to those skilled in the art.

Thus, the present invention relates to a sheet-like article of the type comprising a feed table equipped with one or more lower drive belts 11 for conveying the layer 3 of the sheet-like article, such as the cutting press described above shown in FIG. 1. Relates to a processing machine. If the machine is equipped with a sophisticated positioning device that does not need to stop the seat, the machine can reach an output speed of 8,000 to 12,000 seats per hour.

An auxiliary drive according to the invention is shown in FIG. 6. According to the invention, this auxiliary drive device comprises a frame arranged on top of a feed table of a processing machine. According to the invention, this frame supports at least one upper drive belt 15. If necessary, in the example of the embodiment herein shown in FIG. 6, the frame supports two of the upper drive belts. The upper drive belt 15 is driven by the shaft 16 in synchronization with the lower drive belt (s) 11.

In the example of the embodiment herein shown in FIG. 6, the auxiliary drive device comprises two movable carriages which can slide on two guide bars 26. Advantageously, as shown in FIG. 6, one carriage is the movable carriage 17 for formatting, which turns the upper belt or each upper belt 15 so that this upper belt is connected to the layer 3. It does not lie on top of the, and also drives the layer to the point where the lowest sheet 14 of the layer 3 is caught by the positioning bar and the grip bar 4 of the conveying member 5 thereafter. Thus, the formatted movable carriage 17 allows the layer 3 to be optimally transported whatever the format of the sheet forming the layer. In the example of the embodiment shown in FIG. 6, the formatted movable carriage 17 is a carriage located farthest downstream.

As schematically shown in FIG. 7, this movable carriage is pushed by an elastic member 22 which ensures tension of the belt 15 as well as one or more transfer pulleys 21 which allow to form an endless belt 15. One or more rollers 29.

Optionally, the auxiliary device according to the invention can be raised by pivoting the frame about a shaft 25 located proximate to one of both ends of the frame. In FIG. 6, the shaft 25 is located close to the downstream end of the frame, but it is entirely possible here to place the shaft close to the upstream end of the frame. When the auxiliary device is raised, the operator of the processing machine can easily remove the sheet which may not be properly separated in the layer 3 or the sheet whose gap may not be uniform.

Preferably, the auxiliary device comprises one or more pressure pulleys 20 which are capable of applying pressure to the drive belt 15 and being movable in a direction perpendicular to the surface of the belt 15, thereby providing a relief of the layer 3. It can be adapted to the thickness and can increase the surface area of the layer 3 subjected to the pressing force and the driving force of the belt 15 as much as possible.

The side column 30 arranged in the movable carriage shown in FIG. 8 supports all different transmission and pressure pulleys 20, 21, 31, 32. Thus, the combination of the pulley set, the circumference 30 and the drive belt 15 form a bogie.

Preferably, the auxiliary device comprises means 23 for adjusting the pressing force exerted on the layer 3 by the upper drive belt 15. Means 23 for adjusting the pressing force reduce the weight of the auxiliary device or vice versa to press the layer 13 further in addition to the original weight of the auxiliary device. In the example of the embodiment shown in FIG. 8, the means 23 for adjusting the pressing force consists of a pneumatic jack, the pressure of which can be adjusted. Thus, in the example of the embodiments herein, the bogie can move. The working position of the bogie is defined by two arms 28 which are hinged to the extension of the movable carriage 17 at one end and to the shaft at the other end, the bogie assembly also pivoting about the shaft, The surface of the layer 3 can be pressed as optimally as possible.

The mechanism for driving the upper drive belt (s) 15 can take a different form, in particular the drive shaft 19 of the lower drive belt (s) 11 with the drive shaft of the upper drive belt (s) 15. It can take a different form in connection with the mechanical connection to (16). 9 shows one embodiment of such a mechanical connection made by two friction wheels 24.

The upper drive belt (s) 15 of the auxiliary device according to the invention exerts a driving force on top of the layer 3, thereby ensuring that the material of the sheet-like article accurately conveys the layer without applying any pressing force. do. Thus, a small number of upper drive belts 15 can be used and the number of lower drive belts 11 of the supply table of the processing machine can be reduced.

In addition, the auxiliary device according to the present application can identify and solve other technical problems. Note that in a system for transferring layers of sheet-shaped articles on a feeding table of a conventional machine, the speed of the articles increased slightly when transferring the sheet-shaped articles and there was also a speed difference of the articles depending on the thickness of the layers and the number of overlapping articles. I had to. This is because the pulley that introduces the sheet-like article into the feed table has the effect of the side rim. Thus, the sheet-like article is slightly accelerated by the sheet-like article sliding under it, and eventually the layer 3 is advanced at a slightly faster speed than the lower drive pulley 11. Also, the speed difference between the layer 3 and the belt 11 depends on the number of sheet-like articles laminated in the thickness of the layer, and thus varies between the first article of the layer and the economic speed.

The auxiliary device according to the present invention can ensure much more accurate transfer than the conventional system by synchronizing the drive of the upper belt 15 and the drive of the lower belt 11. By doing so, management of the sheet-shaped article by the positioning device becomes easy, and the position of each sheet-like article in the layer 3 and the moment when the positioning device should acquire the sheet-shaped article can be better predicted.

The above problem does not constitute the main problem which the present invention intends to solve a priori, but solving this problem brings the additional obvious advantage of the device according to the present application over the conventional device.

Claims (7)

An auxiliary drive for a sheet-like article processing machine of the type comprising a feed table equipped with at least one lower drive belt 11 for conveying a layer 3 of sheet-like article, the frame being arranged on the feed table of the processing machine. In the auxiliary drive device comprising a, The frame, At least one upper drive belt 15 configured to cooperate with the lower drive belt (s) 11 to apply a pressing and driving force to the upper surface of the layer 3 to transport the layer 3 of the sheet-like article, An auxiliary drive device characterized in that it supports a mechanism for driving the upper drive belt (s) 15 which is configured to drive the upper drive belt (s) 15 in synchronization with the lower drive belt (s) 11. . 2. Auxiliary drive device according to claim 1, characterized in that it comprises a movable carriage (17) for formatting the upper drive belt or each upper drive belt (15). The auxiliary drive device according to claim 1 or 2, characterized in that it comprises a transmission and pressure pulley (20) movable in a direction perpendicular to the surface of the upper drive belt or each upper drive belt (15). The auxiliary drive device according to any one of the preceding claims, characterized in that it comprises means for adjusting the pressing force exerted on the layer (3) by the upper drive belt (15). 5. A secondary drive device according to claim 4, wherein the means for adjusting the pushing force comprises a pneumatic jack. Auxiliary drive device according to any of the preceding claims, characterized in that the auxiliary drive device can be raised by pivoting the frame about the shaft (25). A sheet-like article processing machine of the type comprising a feeding table equipped with at least one lower drive belt 11 for conveying a layer 3 of sheet-like article, A sheet-shaped article processing machine comprising the auxiliary drive device according to claim 1.

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