EP1004531A2 - Buckling folder with adjustable folding gap - Google Patents

Abstract

The machine automatically adjusts the folding rollers (W1-W5) to give different seam widths dependent on the measured or computed thickness of the paper sheet or stack passing through the seam gap (F1-F4). Each adjustable roller is mounted on a pair of coaxial swing arms (22) actuated by an electrically-controlled adjuster against spring action (26) and under control of an electronic computer. The adjusters (S1-S5) consists of pneumatic rams functioning in cascade and whose working strokes are added together. These strokes can have different values, that of each ram being double that of the one preceding it.

Description

The invention relates to an upset folding machine with a Device for automatically setting the folding rollers to different gap widths depending on the measured or calculated thickness of a the gap between the continuous sheet of paper or stack, the folding rollers to be understood in pairs coaxially mounted swivel levers are mounted, which under the influence of electrically controllable actuators are pivotable against permanent restoring forces and the control of the actuators by an electronic Process computer takes place, the one to be set in each case Fold gap widths according to a given work program from measured and / or manually entered Paper thicknesses and / or fold types are calculated.

In a known paper folding machine of the generic type Art (DE-G 92 03 930.8) are each one in pairs Folding rollers forming the folding point in pairs existing two-armed swivel levers, which movable apart against the action of radial spring forces are.

These swivel levers are actuated by actuators, through which the center distances of the folding rollers by means of self-locking, manually adjustable thread engagement according to the paper thickness to be processed and the number of paper layers passing through the individual folding points adjustable to different gap widths are. To determine the gap widths of the individual Folding roller pairs is a programmed process computer provided with an input keyboard and a digital display, which is the thickness and the arc length of the incoming Folded goods either manually or via electronic analog-digital converter from a thickness measuring device or a length measuring device and the desired type of fold and / or the set lead lengths of the individual Flow limiter can be entered.

The entered by the process computer according to the program Fold gap widths calculated in each case are as Digital values are displayed and / or each with electronic comparison circuits and power amplifiers provided control device. This Control device controls geared motors of overrun control devices, the via the intended thread interventions the continuous adjustment of the individual Center distances on these of the single or multiple Thickness of the folded material corresponding to the gap widths cause and the as actual value transmitter electrical or electronic Have position detectors, each with the Actuators are connected.

The thickness measuring device and the length measuring device are in a between a sheet separation device and a feed point formed by a pair of rollers lying transport track arranged. The folding rollers are arranged to each other so that the axes two folding rollers in the corners of an isosceles right triangle and that one each Folding roller of a pair of folding rollers in the direction of one Cathete and the other towards the other cathete the triangle is adjustable. Achieved in this way an optimal arrangement and storage of each two-armed swivel lever and it is guaranteed that the individual folding rollers each without interference and unaffected different from the other folding rollers Fold gap widths can be adjusted.

The provided in this known upset folding machine Actuators, each of electric gear motors are driven and have thread engagements, via which the respective settings of the swivel lever done, allow automatic, individual Adjustment of the individual folding rollers. This setting but with this known upset folding machine over a larger series of identical work processes maintained. It is with this known adjustment device not possible with immediately consecutive different paper or stack thicknesses and Fold types an adjustment within the throughput frequency of the folding rollers.

The invention has for its object a compression folding machine to create the type mentioned at the setting of the folding rollers to different Fold gap widths very quickly and also temporarily can be done for a very short period of time.

This object is achieved in that the actuators consist of several cascades in rows arranged pneumatic working cylinders, whose working strokes add up to each other.

The inventive design of the actuators and their pneumatic operation, it is possible to respective settings of the individual folding rollers to certain Corresponding fold gap widths in quick succession a high pass frequency to change it by the further configurations according to claims 2 and 3 between a minimum and a maximum gap width possible more standardized intermediate values adjust as a working cylinder in an actuator available.

For example, three can be arranged in one actuator Working cylinders, the three different working strokes have a total of eight different gap widths can be set on a pair of rollers, in which the three working cylinders in different combinations be charged.

The design is for controlling the individual working cylinders the invention according to claim 4 advantageous, because it is simple, reliable and has a high switching speed working controls a reliable Ensure the way of working.

Due to the configuration according to claim 5 is a very simple, compact and easy to manufacture construction achieved with high functional reliability.

The configurations according to claims 6 and 7 a trouble-free application with simple means and high response speed of the individual working cylinders or their working pistons safely.

By grouping the control valves in groups According to claim 8 there is a clear, simple Structure of the control units on which any Causes of faults can also be identified quickly.

The embodiment according to claim 9 also serves to achieve this a high response speed of the individual Working cylinder.

Fig. 1

in schematisch vereinfachter Darstellung eine Stauchfalzmaschine mit vorgelagerter Sammelstation und einer vor dieser angeordneten Bogenzuführeinrichtung;

Fig. 2

in schematischer Seitenansicht die Anordnung der einzelnen Falzwalzen und deren Schwenkhebel mit ihren Stellgliedern;

Fig. 3

in stark vergrößerter Darstellung ein Stellglied im Schnitt;

Fig. 4, 5, 6 und 7

in schematischer Seitenansicht die auf unterschiedliche Falzspaltweiten zur Einzugswalze eingestellte erste Falzwalze mit ihrem Schwenkhebel und im Schnitt das diesem zugeordnete Stellglied;

Fig. 8

in schematischer, teilweise perspektivischer Blockdarstellung, die jeweils paarweise vorhandenen, einer einstellbaren Falzwalze zugeordneten Stellglieder mit den einzelnen pneumatischen Steuereinheiten und einem Walzenpaar;

Fig. 9

eine beispielhafte, tabellarische Aufstellung von einstellbaren Falzspaltweiten;

Fig. 10

ein schematisches Blockschaltbild der elektrischen bzw. elektronischen Steuereinrichtung mit einem Mikroprozessor.

The invention is explained in more detail below with the aid of the drawing. It shows:

Fig. 1

in a schematically simplified representation, an upset folding machine with an upstream collecting station and a sheet feeder arranged in front of it;

Fig. 2

in a schematic side view the arrangement of the individual folding rollers and their pivoting lever with their actuators;

Fig. 3

in a greatly enlarged representation an actuator in section;

4, 5, 6 and 7

in schematic side view, the first folding roller set to different folding gap widths for the feed roller with its pivoting lever and, on average, the actuator assigned to it;

Fig. 8

in a schematic, partially perspective block diagram, each of the actuators associated with an adjustable folding roller in pairs, with the individual pneumatic control units and a pair of rollers;

Fig. 9

an exemplary, tabular list of adjustable gap widths;

Fig. 10

a schematic block diagram of the electrical or electronic control device with a microprocessor.

The upset folding machine 1, shown only schematically in FIG. 1, has a total of five folding rollers W1 to W5 and also a feed roller W , which forms a feed point E with the first folding roller W1 . This feed point E is located at the point where the two rollers W and W1 touch or have the smallest distance from one another. The folding roller W1 forms the first folding point F1 with the folding roller W2 , while the other folding rollers W2 to W5 each form the folding points F2 , F3 and F4 in pairs. The axes E1 of the feed roller and A1 to A5 of the folding rollers W1 to W5 each lie in the corners of isosceles, right-angled triangles 2, 3 and 4, which are shown in dash-dotted lines in FIG. 2.

While the feed roller W is mounted in a stationary and non-adjustable manner, each of the folding rollers W1 to W5 is in each case radial to the interacting rollers W1 to W4 which either cooperate with it and form either the feeding point E or a folding point F1 to F4 in the direction of the one shown in FIG. 2 Arrows adjustable. This allows the feed gap at the feed point E to be adjusted to the thickness of the incoming paper or paper stack of the folding material to be processed and the gap widths at the individual folding points F1 to F4 to the optimum dimension. The folding rollers W1, W3 and W5 are each in the vertical direction radially to the respective overlying rollers W or W2 and W4 adjustable, while the folding rollers W2 and W4 to the folding rollers W1 and W3 are radially adjustable in the horizontal direction.

As usual with upset folding machines, in front of the individual folding points F1 to F4 there are inclined folding pockets T1 , T2 , T3 and T4 , the paper stops 6, 7, 8 and 9 of which are either manually or automatically, controlled by a process computer 10, according to a predetermined program can be set. Likewise, the paper deflectors 12 individually assigned to each folding pocket T1 , T2 , T3 and T4 , by means of which the individual folding pockets T1 , T2 , T3 and T4 can be closed as required, are manually and / or automatically by the process computer 10 into the folding program set in each case Position bringable.

For adjusting and positioning the paper stops 6 to 9 in the folding pockets T1 to T4 , devices driven by an electric motor are provided, which can also be controlled by the process computer 10, which has all the data required for setting the lead lengths in the individual folding pockets T1 to T4 via a connected keyboard 21 , for example, the length of the basic format of the folded goods, the folded shape and the desired length of the final format can be entered, with the new known different folding shapes being selectable overall.

The process computer 10 consists, as from the schematic 10 can be seen from a main processor (Master processor) 20/1 and a subordinate second processor (slave processor) 20/2. To the Main processor 20/1 the keyboard 21 is connected, which the operator uses to setpoints or parameters can enter. There is also a digital display on it connected in the form of a display 39, the several display fields for the display of those of interest Has values. This main processor is also 20/1 able to operate values or parameters the upset folding machine 1 are required, even when switched off Save state so that it doesn't work every time must be re-entered as long as no change is required.

For this purpose, it is provided with an electronic data memory DS in which these values and parameters are kept available for calculation of the gap widths to be determined and to which, for example, four signal transmitters or actual value transmitters can be connected.

The work program of the process computer 10 is contained in an EPROM , that is to say in an erasable program instruction memory, by means of which the determination or calculation of the desired values from the parameters mentioned is carried out. The second processor 20/2 carries out the actual setting of the fold gap widths and possibly also the setting of the lead lengths, for example by correspondingly setting the paper stops 6 to 9 in the fold pockets T1 to T4 . This second processor 20/2 is connected via an interface 20/3 for the exchange of data with the main processor 20/1 and is provided with an output-side power amplifier LV , via which it controls the control units SE1 , SE2 , SE3 , SE4 and SE5 for setting the fold gap widths controls. An analog-digital converter unit A / D connects both analog signal transmitters and an automatic paper or stack thickness measuring device 40 to the second processor 20/2, while an automatic sheet counting device 41 is connected directly to it.

It can be seen from the fold shapes a , b , c and d shown schematically in FIG. 1 that the number of paper layers with which the folded material passes the individual fold points F1 to F4 can be different. This means that the fold gap widths of the individual fold points F1 to F4 , if they are to be optimally adjusted, can correspond to single to four times the paper or stack thickness. It should also be borne in mind that the paper thicknesses of the folded material to be processed can be very different.

In order to be able to quickly, briefly and optimally set this optimal gap gap width, which is required to achieve a folding accuracy, during the working process of the upset folding machine 1, a setting mechanism is provided for the individual folding rollers W1 to W5 at the two roller ends, as shown, for example, in FIG. 8 shown for the folding roller W1 for setting the gap width at the feed point E. is.

As already mentioned, the feed roller W is fixed in place, ie rotatably mounted in radially immovable bearings 13 in two frame boards 14 and 15. The first folding roller W1, on the other hand, like the other folding rollers W2 to W5 , is each mounted on a lever arm 23 of a bearing part consisting of a two-armed pivoting lever 22, which can be pivoted about a pivot bearing parallel to the roller axis on bearing journal 25 and whose second lever arm 24 is below that Influence of a tension spring 26 is that the folding roller W1 is pressed radially against the feed roller W from below.

To change the center distance or to set a certain gap width at the feed point E , the second lever arm 24 of the pivot lever 22 is provided with an adjusting screw 27, which is seated on an activatable actuator S1 , which is fixed in the frame of the folding machine.

As can be seen from FIG. 8, there are two such actuators S1 which can simultaneously actuate the pivot levers 22 of the folding roller W1 , which are also provided in pairs. The other pairs of pivot levers 22/2, 22/3, 22/4 and 22/5 shown in FIG. 2 are each assigned two actuators S2 , S3 , S4 and S5 , the actuators S1 , S2 and S3 each occupying a vertical position and the two actuators S4 and S5 are in a horizontal position. This ensures that the actuators S1 to S5 assigned to the individual pivot levers 22 to 22/5 are each arranged at right angles to the lever arms 24 which they actuate.

These actuators S1 to S5 are each constructed identically. They each consist of several, in the present embodiment of FIG. 3, three, cascade-like, arranged in rows pneumatic working cylinders 61, 62, 63, the working strokes of which add together. These working cylinders 61, 62, 63 are arranged axially displaceably axially in a common housing cylinder 65. They each consist of a cylindrical housing body 70 with an airtightly inserted end wall 71 and a second end wall 72 integrally formed in one piece. Thrust pistons 73 with sealing rings 74 are each axially movable in the cylindrical cavities of the housing body 70. These thrust pistons 73 are each provided with a cylindrical thrust tappet 76 which projects movably through a central axial bore 75 of the fixed end wall 72. A spacer pin 77 is provided on the side of the push piston 73 opposite this push rod 76, which defines the starting position or the rest position of the push piston 73 by having its lower end seated on the respective end wall 71. The cavity lying between the end wall 71 and the thrust piston 73 forms a pressure chamber 78 of the respective working cylinder 61, 62 or 63. The hollow space 79 between the thrust piston 73 and the fixed end wall 72 is through axial bores 80 with the respectively between two working cylinders 61 and 62 or 62 and 63 lying cavity 81 or 82 of the housing cylinder 65, wherein this cavity 79 of the working cylinder 63 is directly connected to the external environment through the axial bores 80.

The between each two working cylinders 61 and 62 or 62 and 63 lying cavities 81 and 82 of the housing cylinder 65 are each with radial bores 83 and 84 with connected to the outside air.

These cavities 81 and 82 are each formed by that the end walls 71 of the working cylinders 62 and 63 the push rod 76 of the working cylinder in front of it 62 or 61 due to the tensile action of the tension spring 26 sits and this push rod 76 also in their rest position protrude from the upper end wall 72 to between the adjacent working cylinders 61 and 62 and 62, respectively and 63 maintain a minimum axial distance.

In order for this external connection in the middle working cylinder 62 through the radial bore 84 even after an axial displacement relative to the radial bore 84 to ensure is the working cylinder 62 at its upper end portion provided on the outside with an annular fold 87, by which the radial bore 84 also with the shifting Cavity 82 still communicates when the working cylinder 62 in the direction of the working cylinder 63 is moved with this.

Both the radial bores 83 and 84 in the housing cylinder 65, as well as the axial bores 80 in the end walls 72 of the working cylinders 61, 62 and 63 serve alternately as ventilation and ventilation channels for the air chambers 79 of the three working cylinders 61 to 63. To one if possible high working speed of the working cylinders 61, 62 and 63, it is advantageous if the radial bores 83 and 84 and the axial bores 80 several times are present, so that in the shortest possible time when moving a thrust piston 73 or one of the working cylinders 61, 62, 63 even the largest possible volume of air in the Cavities 81 and 82 and 79 penetrate or from these can leak.

In the axial region of their pressure chambers 78, the working cylinders 61, 62 and 63 are each provided with at least one radial inlet bore 85. In the working cylinders 62 and 63, which are axially movable relative to the working cylinder 61 seated on a lower end support wall 88, these inlet bores 85 each lie in a circumferential circumferential groove 86, the axial length L1 or L2 of which extends over a dimension that the The sum of the individual working strokes h1 and h2 corresponds to the thrust pistons 73 lying in front of them. In the present case, these are the working strokes of the thrust pistons 73 of the two working cylinders 62 and 63. The circumferential grooves 86 of the working cylinders 61 to 63 are each sealed by two ring seals 90 in both axial directions. The housing cylinder 65 is provided with compressed air connections 66, 67 and 68 for the compressed air supply to the individual working cylinders 61, 62, 63, each of which opens into a circumferential groove 86. Because the working cylinder 61 does not move in the housing cylinder 65, the axial extent or length of its circumferential groove 86 need only approximately correspond to the bore diameter of the compressed air connection 66 or the diameter of its inlet bore 85

The number of compressed air connections 66, 67 and 68 corresponds thus the number of arranged in the housing cylinder 65 Working cylinders 61, 62 and 63, so that each working cylinder 61, 62 and 63 individually and independently acted upon by compressed air from the other two working cylinders can be what happens because each into the pressure chamber 78 of the working cylinder in question 61, 62 or 63 compressed air is introduced.

When the working cylinder 61 is pressurized with compressed air, its push piston 73 shifts the two working cylinders 62 and 63 behind it by the size of its working stroke h1 in the stationary housing cylinder 65 via the push rod 76. When the working cylinder 62 is actuated, its push piston 73 moves over the push rod 76 the working cylinder 63 around the working stroke h2 which the thrust piston carries out in the working cylinder 62. The push piston 73 of the working cylinder 63 actuates the lever arm 24 of the pivot lever 22 directly. The working strokes h1 , h2 and h3 of the individual thrust pistons 73 thus add up while being acted upon simultaneously.

It can be seen from FIG. 3 that the axial distances of the thrust pistons 73 from the fixed end walls 72 of the individual working cylinders 61 to 63 are each of different sizes, so that the working strokes h1 , h2 and h3 are also different. In the present exemplary embodiment, the working stroke h1 of the working cylinder 61 is 0.5 mm, the working stroke h2 of the working cylinder 62 is 1 mm and the working stroke h3 of the working cylinder 63 is 2 mm. If the zero position is taken into account, this results in a total of eight different stroke settings on the push rod 76 of the uppermost working cylinder 63 and thus also a total of eight different adjustment options on the pivoting levers 22 and the folding rollers W1 to W5 attached to them.

Arbeitshubkombinationen von 1,5 mm, 2,5 mm und 3,5 mm erzielt werden können.These possible combinations are identified in the table of FIG. 9 by asterisks, in which the working cylinder 61 is designated with the letter A , the working cylinder 62 with the letter B and the working cylinder 63 with the letter C , and in which in the first column cylinders charged with compressed air are specified. From this table it can be seen that a working stroke h1 of 0.5 mm occurs when the working cylinder A is acted upon, a working stroke h2 of 1 mm occurs when the working cylinder B is acted upon and a working stroke h3 of 2 mm occurs when the working cylinder C is acted upon and that with the combinations A + B or A + C or B + C or

Working stroke combinations of 1.5 mm, 2.5 mm and 3.5 mm can be achieved.

If one assumes a lever ratio between the first lever arm 23 and the second lever arm 24 of 1: 1 in the case of the swivel arms 22 to 22/5, this means that the fold gap widths ES0 shown in FIGS. 4, 5, 6 and 7 also , ES1 , ES3 and ES7 are 0 mm or 0.5 mm or 1.5 mm or 3.5 mm. 4 to 7 can also be seen that the adjusting screw 27 rests on the upper end face 28 of the push rod 76 of the uppermost working cylinder C (63).

As can be seen from FIG. 8, pneumatic control units SE1 , SE2 , SE3 , SE4 and SE5 are provided in the actuators S1 to S5, which are actuated in pairs, for the individual actuation of the working cylinders 61, 62 and 63. The identical control units SE1 to SE5 each have three 2/3 way valves V1 , V2 and V3 , the outputs of which are connected via pressure lines 91, 92, 93 to the compressed air connections 66, 67 and 68 of the individual actuators S1 to S5 . The 2/3 way valves V1 , V2 and V3 are in turn connected on the input side via compressed air lines 94, 95 and 96 and via a distributor line 98 to a compressed air source, for example to a compressor 97.

The individual 2/3 way valves V1 , V2 and V3 of the control units SE1 to SE5 are controlled via the power amplifier LV of the process computer 10 as a function of the data which the paper or stack thickness measuring device 40 or the sheet counting device 41 sends to the process computer 10 deliver.

2 schematically shows that, for example, a thick stack of paper 100, a single sheet 101, a double sheet 102 and then again a thick stack of paper 100 can enter the folding machine, which are detected by the paper or stack thickness measuring device 40. The respective setting of the folding rollers such as W1 , W2 , W3 , W4 and W5 is then carried out accordingly to the calculated, optimal folding gap width, which is given as an example in the table in FIG. 9.

The pneumatic working pressure with which the push piston 73 of the individual working cylinders 61, 62 and 63 individually or can be acted upon and actuated together, for example 6 bar.

The return springs 26 have the task of quickly returning the pivoting levers 22 and the working cylinders 62 and 63 or the pushing pistons 71 of all the working cylinders 61, 62 and 63 to their starting position in order to set the respective gap width to zero when the pressurization has ended . With the corresponding switching of the activated valves V1 , V2 and / or V3 , the pressure lines 91, 92 and 93 must also be disconnected from the inlet-side pressure line 94 or 95 or 96 and at the same time activated, so that the air in the pressure chambers 78 can quickly escape outdoors. To ensure this, appropriate line cross sections are required.

As is known per se, the upset folding machine 1 is a Upstream sheet collecting device 52, in each of which Formed stacks of sheets according to a certain program can be made up of different amounts of paper sheets exist and therefore also different stack thicknesses exhibit. The feeding of the individual sheets of paper takes place, as shown in Fig. 1, from a stack of paper 53 a separating device 54, from which the individual sheets of paper, for example by means of a suction roller 56 deducted from the paper stack 53 and by pairs of conveyor rollers 57 transported into the sheet collecting device 52 become.

The thickness measuring device arranged in this sheet collecting device 52 40 and the sheet counting device 41 are, as described, connected to the process computer 10 and serve as a signal generator for the measured Sheet or stack thickness or for the number of each to a stack of individual sheets.

Claims (9)

Compression folding machine with a device for automatically setting the folding rollers ( W1 to W5 ) to different gap widths ( ES1 , ES2 , ES3 , ES7 ) depending on the measured or calculated thickness of a paper sheet or stack passing through the folding gap ( F1 to F4 ), the folding rollers to be adjusted are each mounted on swivel levers (22) mounted coaxially in pairs, which can be pivoted under the influence of electrically controllable actuators ( S1 to S5 ) against permanent restoring forces (spring 26) and the actuation of the actuators by an electronic process computer (10) takes place, which calculates the fold gap widths to be set according to a given work program from measured and / or manually entered paper thicknesses or stack thicknesses and / or fold types,
characterized by
that the actuators ( S1 to S5 ) each consist of a plurality of cascade-like rows of pneumatic working cylinders (61, 62, 63) whose working strokes ( h1 , h2 , h3 ) add each other. Compression folding machine according to claim 1, characterized in that the working strokes ( h1 , h2 , h3 ) of the individual working cylinders (61, 62, 63) are of different sizes. Upsizing machine according to claim 2, characterized in that the working strokes ( h2 , h3 ) of the individual working cylinders (62, 63) of an actuator ( S1 to S5 ) are each twice as large as the working stroke ( h1 , h2 ) of the working cylinder in front ( 61, 62). Upsizing machine according to claim 1, characterized in that the pneumatic actuation of the individual working cylinders (61, 62, 63) is carried out in pairs by electromagnetic 2/3 way valves ( V1 , V2 , V3 ) which are connected to a common compressed air source, in particular a Compressor (97) are connected and are each controlled individually by the process computer (10). Compression folding machine according to claim 1, characterized in that the working cylinders (61, 62, 63) of an actuator ( S1 to S5 ) are arranged axially displaceable coaxially in a common housing cylinder (65) such that the working strokes ( h1 , h2 , h3 ) of the individual working pistons (73), each corresponding to their size, causing axial displacements of the working cylinder (s) (62, 63) following in space and the working piston (73) of the last working cylinder (63) in the row acts directly on the pivoting lever (22). Upsizing machine according to claim 5, characterized in that the individual working cylinders (61, 62 63) each have at least one radial inlet bore (85) in the axial region of their pressure chambers (78), which lies in a circumferential circumferential groove (86), the axial length ( L1 , L2 ) extends over a dimension which corresponds to the sum of the individual working strokes ( h1 , h2 ) of the thrust pistons (73) located in front of each, and that the housing cylinder (65) is provided with a number of compressed air connections (66, 67, 68) which each open into one of the circumferential grooves (86). Compression folding machine according to claim 6, characterized in that that the circumferential grooves (86) of the individual working cylinders (62, 63) by at least two each Ring seals (90) sealed in both axial directions are. Upsizing machine according to claim 6, characterized in that the compressed air connections (66, 67, 68) of each housing cylinder (65) are each connected to the outlet of a 2/3 way valve ( V1 , V2 , V3 ) which, together with the second / 3-way valves of the other compressed air connections (66, 67, 68) of the same housing cylinder (65) form a control unit ( SE1 to SE5 ) for a folding roller (W1 to W5 ). Compression folding machine according to one of claims 2 to 8, characterized in that both the working cylinder (61, 62, 63) as well as the housing cylinder receiving them (65) with ventilation openings (80, 83, 84) are provided.

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