EP1380366B1 - Feeding device for intermittently feeding a band material to a press and method for operating such a device - Google Patents

Abstract

A rocker (33) supports an upper feeding roller (10) which cooperates with a lower feeding roller (22) for feeding a strip shaped blank (7). A pressure spring (84) is arranged between the rocker and the housing of a threaded spindle (50). The pressure springs press the rocker with an upper shaft (69), on which the upper feeding roller is supported, onto a lower shaft (73) with lower feeding roller. The apparatus includes two double arm levers (93), each having two arms (94,95). An adjusting nut (57) is arranged on the threaded spindle and supports first double arm lever. The second double arm lever is pivotally mounted at its arm (94) through a connecting strip to the arm (95) of first double arm unit. The arm (95) of second double arm unit is pivotally mounted through a control rod (71) to the rocker (33). The arm (94) of the first double arm unit supports a bolt which projects into the elongated hole (59) of an eccentrically supported rod (96). An Independent claim is also included for a method of operating a feeding apparatus.

Description

The present invention relates to a feed device for intermittently supplying a band-shaped blank to one with tools for intermittent Editing the band-shaped blank equipped Press, which feed device a housing and a threaded spindle housing arranged on the housing, a arranged on a harmonic upper feed roller and a lower shaft disposed on a lower shaft Feed roller having which feed rollers intended are, the supplied blank by a two-sided To seize terminals and through an intermittent To advance rotational movement intermittently, by which waves at least one with an intermittent working electric servomotor is drivingly connected and the harmonic in one over a swinging shaft at the Housing hinged rocker is mounted by means of which they move against the lower shaft and away from it is.

The invention further relates to a method for operation of the aforementioned feed device, which feed device has a control device and interact with a press that is a moving one Upper tool and has a fixed lower tool, which upper tool with one between an upper Dead center position and a bottom dead center position movable plunger is connected, and the one press control having, with the control device of Feed device is connected, and in which the slot of between a top dead center position and a bottom dead center position movable connecting rod has upper and a lower end, the first arm of the second double-armed lever device via a slot passing bolts in engagement with the connecting rod stands, wherein for introducing a new band-shaped blank between the upper feed roller and the lower feed roller Feed roller, the upper feed roller in a high-lift position is driven to give a pre-eminent position in this position Distance between the upper feed roller and the set lower feed roller.

Furthermore, the invention relates to a method for operating the feed device of the aforementioned Type in which the feed device is a control device and cooperates with a press, a moving upper tool and a fixed lower tool has, which upper tool with an intermediate a top dead center position and a bottom dead center Totpunktstellung movable plunger is connected, and having a press control device, with the Control device of the feed device in connection stands, and in which the slot of between a top dead center position and a bottom dead center position movable connecting rod an upper and a lower end comprising the first arm of a first double-armed lever device via a bolt penetrating the slot is engaged.

The invention also relates to a method for Operation of the feed device of the aforementioned Type in which the feed device is a control device and cooperates with a press, the a moving upper tool and a fixed lower tool has, which upper tool with an intermediate a top dead center position and a bottom dead center Totpunktstellung movable plunger is connected, and having a press control associated with the control device the feed device is in communication, and in which the slot of the between an upper Dead center position and a bottom dead center position movable Pleuels has an upper and a lower end, the first arm has a first double-armed lever device via a bolt passing through the slot in Engage with the connecting rod, which ram of one driven by rotating drive and the eccentric disc of the connecting rod is driven by a drive motor, which Upper tool Cutter pins for precise positioning the band-shaped blank in the press during the machining process the same, which pegs in pre-punched positioning holes in the band-shaped blank are moved into which pins a conical Head section, wherein the upper feed roller then away from the lower feed roller into an intermediate fan position is moved upward when the conical Head sections partially retracted into the positioning holes have been and then dropped off again on the blank is when the conical head sections partially have been dug out of the position holes.

The presses mentioned here are in particular high-speed presses with stroke rates up to 2000 Strokes / minute. These presses are equipped with tools for machining one (or more) supplied band-shaped Blank, with punching, embossing, Bending, riveting, threading, etc. are performed.

The movement of the band-shaped blank, the is edited in the press, takes place intermittently, so gradually. During a processing step, e.g. a punching, obviously no Forward movement of the band-shaped blank. Often he will precisely positioned by means of gripping pins arranged in the tools So arrested. After completion of the processing step, after, for example, a punching tool been moved out of the punched hole is, the band-shaped blank by a predetermined Route advanced and stopped again, so that the next processing step to be performed can.

The feed resp. Feed movement of the band-shaped Blanks are made by one (or more, at Inlet and outlet of the press). or feed unit (or feed units) to the ribbon-shaped blank intermittently from a supply roll deduct and deliver to the press.

These feeders usually have Feed links on to advance the ribbon-shaped blank. This is clamped by the feed members and moved forward. When the feed links again return to their original position, the clamping is canceled. The clamping is additionally during the period temporarily suspended during which the tools on the band-shaped blank a processing step perform, especially in the case of pegs.

There are versions of such feeders become known, in which the clamping members are formed as linearly moving clamps. Other versions have oscillating, rotational movements exporting segment rollers.

Also are feeders with electric Servo motors become known. Here is a first servomotor the feed operation of the clamping members and another, second servomotor the intermittent lifting associated with a clamping member or band-shaped blank. Such servomotors are manufactured by several companies and sold. The operation of these servomotors is electronically controlled. Show these new feeders as feed members completely cylindrical, on Shafts arranged feed rollers, which intermittently always rotate in the same direction. From these feed rollers is one in one with the other servomotor Driven connected component stored due to its operation this feed roller against the band-shaped blank for clamping it and moved away from it for release becomes.

Play through the current high number of strokes the masses of moving parts of a feeder unit due to inertial forces and moments of inertia great role, and also have a big impact on the precision of the manufactured product. Further must move the arrangement and training of this Parts due to the time periods for acceleration and Delay of movements be such that an operation can be carried out safely with high stroke rates.

It is thus an object of the present invention a device for intermittently feeding a band-shaped blank to create the minimum moving parts, wherein those parts, the high Accelerations and delays are subject have the smallest possible masses and no drive motors are present, which work oscillatingly.

Another goal is a device too create, in which the frame is a threaded spindle housing in which the threaded spindle is arranged is which threaded spindle rigid with a sleeve part is connected, the play on roller bearings in the threaded spindle housing is stored, so that the threaded spindle is stored in the threaded spindle housing without play.

Yet another object of the invention is a Device to show in which the with the threaded spindle rigidly connected sleeve part of a multipart Clamping sleeve is, in which the drive shaft of the other Servomotor protrudes so that the drive shaft the other servo motor frictionally with the threaded spindle is connected, which when mounting the other Servomotor by connecting its drive shaft with the threaded spindle on the clamping sleeve the final position of the servo motor by the threaded spindle housing precisely mounted threaded spindle is determined.

Also, it is another objective of the present Invention a method of operation of the aforementioned Feed device to show in which the Setting the high-lift position of the upper feed roller controlling said two control devices be that the plunger in its bottom dead center position and the connecting rod is controlled to its top dead center position becomes.

A still further object of the invention is a Method for operating the feed device mentioned above to create, in which the connecting rod in his lower Dead center position is moved, the adjusting nut moved downward by a rotation of the threaded spindle until the upper feed roller due to the. By the Compression springs on the swingarm exerted pressure on the band-shaped blank rests, and then the adjusting nut is moved downwards until the bolt of both ends of the slot has a distance, so that lifting movements of the connecting rod with a fixed bolt are possible.

A still further object of the invention is a Method for operating the feed device of the beginning to create type mentioned, in which the attitude the intermediate release position of the plunger by his rotating drive in an angular position in front of its lower Dead center position is brought, in which angular position the conical head sections of the fishing pins only partially protrude into the positioning holes, and the Eccentric disc of the connecting rod in an angular position the top dead center position is brought, the angular distance the plunger between said angular position and the bottom dead center position equal to the angular distance the eccentric disc between her Angular position and the top dead center is, then the nut is moved down until the strip-shaped blank due to the lifting of the upper feed roller is loose, and that the position of the adjusting nut for said angular position of the eccentric disc and the corresponding angular position of the plunger in the corresponding control devices are stored.

Due to the design of the clamping sleeve, the is an integral part of the threaded spindle, there is the Freedom to select different servomotors and to assemble, and in particular standardized standard motors, because no specially made drive shafts such Servo motors are necessary.

The formation of the feed device must basically fulfill 3 main functions, namely the High ventilation (insert belt), the belt thickness adjustment (the upper roller lies on the tape, play in the slot of the connecting rod) and intermediate ventilation (ventilation before each Punching process). These objects are achieved by a feed device according to claim 1 and by a method of operating this feeding device according to the claims 8, 10 and 11 reached. The dependent claims are preferred Embodiments of the feed device and the method of the invention is.

Figur 1 einen Schnitt durch eine erste Ausführung der erfindungsgemässen Vorrichtung;

Figur 2 einen Teil in Figur 1, in einem vergrösserten Massstab gezeichnet;

Figur 3 die ersten und zweiten Abschnitte der Oberwelle und der Unterwelle sowie der oberen und unteren Vorschubwalze in einer axial auseinandergezogenen Darstellung;

Figur 4 einen Schnitt entlang der Linie IV-IV der Figur 1;

Figur 5 einen Schnitt entlang der Linie V-V der Figur 1;

Figur 6 einen Schnitt entlang der Linie VI-VI der Figur 1;

Figur 7 einen Schnitt durch einen Teil der Vorrichtung, bei dem der Servomotor mit dem Antriebszahnrad und der Kreuzscheibe der Oldham-Kupplung demontiert dargestellt sind;

Figur 7a den Flansch des Servomotors mit montierten Antriebszahnrad und einem Teil der Oldham-Kupplung;

Figur 7b die Kreuzscheibe der Oldham-Kupplung,

Figur 8 einen Schnitt durch eine weitere Ausführung der erfindungsgemässen Vorrichtung,

Figur 9 einen Schnitt durch einen Teil der in der Figur 8 gezeigten Vorrichtung, bei der der Antrieb für die Unterwalze demontiert ist;

Figur 9a den demontierten Antrieb für die Unterwalze der in den Figuren 8 und 9 gezeigten Ausführung;

Figur 10 vereinfacht die in der Figur 6 gezeigten Darstellung, wobei die Vorschubvorrichtung in der Vorschubstellung während dem Dauerbetrieb ohne Zwischenlüftung gezeigt ist;

Figur 11 vereinfacht die in der Figur 6 gezeigte Darstellung, in der die Vorschubvorrichtung in der Hochlüftstellung gezeigt ist;

Figur 12 vereinfacht die in der Figur 6 gezeigte Darstellung, wobei die Vorschubvorrichtung in der Zwischenlüftstellung gezeigt ist; und

Figur 13 schematisch die mit einer Stanzpresse zusammenwirkenden Vorschubvorrichtung gemäss der vorliegenden Erfindung.

The subject matter of the invention will be explained in more detail below with reference to drawings showing exemplary embodiments. It shows:

1 shows a section through a first embodiment of the inventive device;

Figure 2 shows a part in Figure 1, drawn on an enlarged scale;

Figure 3 shows the first and second portions of the harmonic and the lower shaft and the upper and lower feed roller in an axially exploded view;

Figure 4 is a section along the line IV-IV of Figure 1;

Figure 5 is a section along the line VV of Figure 1;

Figure 6 is a section along the line VI-VI of Figure 1;

Figure 7 is a section through a part of the device in which the servomotor with the drive gear and the Oldham clutch disc are shown disassembled;

Figure 7a shows the flange of the servo motor with mounted drive gear and a part of the Oldham coupling.

FIG. 7b shows the cross-disc of the Oldham coupling,

8 shows a section through a further embodiment of the device according to the invention, FIG.

FIG. 9 shows a section through part of the device shown in FIG. 8, in which the drive for the lower roller has been removed;

Figure 9a shows the disassembled drive for the lower roller of the embodiment shown in Figures 8 and 9;

Figure 10 simplifies the illustration shown in Figure 6, wherein the feed device is shown in the feed position during continuous operation without intermediate ventilation.

Figure 11 simplifies the representation shown in Figure 6, in which the feed device is shown in the high release position;

Figure 12 simplifies the illustration shown in Figure 6, wherein the feed device is shown in the intermediate release position; and

Figure 13 schematically shows the cooperating with a punch press feed device according to the present invention.

The device has a housing 1. One first servomotor 2, which simplifies the electronic Control 3 is indicated, is at its flange 4 flanged by bolts 5 on the housing 1.

This first servomotor 2 is known per se Way controlled so that it intermittently intermittent Rotary movements executes. The duration and the Extent of each step of the rotary motion depending on the in the downstream press controlled to be performed processing. This servomotor 2 has a drive shaft 6.

In the housing 1, the harmonic 8, 9 with the upper feed roller 10 and the lower shaft 20, 21 with the lower feed roller 22 is arranged, which supplied to the band-shaped blank 7 usually a metal band, intermittently advance.

The harmonic is in an axial servomotor side first shaft section 8 and one in one axial distance from this first shaft portion 8 arranged Servomotorfernen, second shaft section 9 divided. Between these shaft sections 8, 9 is a upper feed roller 10 kept clamped.

The servomotor remote, second shaft section 9 is from a clamping screw 11 supported on it axially interspersed, with the servomotor side, first Shaft section 8 is in screw engagement.

By this clamping screw 11 are the two Shaft sections 8, 9 stretched against each other, so that the between these shaft sections 8, 9 arranged upper Feed roller 10 is kept clamped.

This upper feed roller 10, which consists of several Parts exists and is very lightly constructed, rejects the Shape of a hollow circular cylinder with an axial interior 12 with an inner peripheral wall 13 and two end surface portions 14 and 15 on. See Figure 3.

The transition region 16 between the end surface portion 14 and the inner peripheral wall 13 of the inner space 12 has the shape of a truncated cone shell. Likewise, the transition region 17 between the End surface portion 15 and the inner peripheral wall 13 of the Interior 12 the shape of a Kegelstumpfmahtels.

The mutually facing ends of the shaft sections 8, 9 also have a truncated cone-shaped Sections 18 and 19, respectively.

It can thus be seen that after completion Tighten the clamping screw 11 corresponding to each other truncated cone-shaped sections 16, 18 and 17, 19, respectively abut each other so that the interposed upper feed roller 10 is clamped and kept guided.

It is also evident that to remove the upper feed roller 10, only the clamping screw 11 dissolved and through an opening in the housing 1, through which the clamping screw 11 is accessible, be pulled away got to. Then the feed roller can be removed easily become.

This condition is purely related, for example with the lower shaft sections to be described later 20, 21 and the lower feed roller 22 in the figure 3 shown. The axial distances to the is still received, are exaggerated size.

The lower shaft 20, 21 is also in one axial servo motor side, first shaft portion 20 and one at an axial distance from this first shaft portion 20 arranged remote servomotor, second shaft portion 21 split. Between these shaft sections 20, 21, the lower feed roller 22 is clamped held.

The servomotor remote, second shaft section 21 is of a clamping screw supported on it 23 axially interspersed, with the servomotor side, first Shaft section 20 is in screw engagement.

By this clamping screw 23 are the two Shaft sections 21, 22 stretched against each other, so that which is arranged between these shaft sections 21, 22 lower feed roller 22 is kept clamped.

This lower feed roller 22, which consists of several Parts exists and is very lightly constructed, rejects the Shape of a hollow circular cylinder with an axial interior 24 with an inner peripheral wall 25 and two end surface portions 26 and 27 on.

The transition region 28 between the end surface portion 26 and the inner peripheral wall 25 of the inner space 24 has the shape of a truncated cone shell. Likewise, the transition region 29 between the End surface portion 27 and the inner peripheral wall 25 of the Interior 24 the shape of a truncated cone mantle.

The mutually facing ends of the shaft sections 20, 21 also have a truncated cone-shaped Section 30 or 31.

It can thus be seen that after completion Tighten the clamping screw 23 corresponding to each other truncated cone-shaped sections 28, 30 and 29, 31, respectively abut each other so that the interposed lower feed roller 22 clamped and kept out is.

It is also evident that to remove the lower feed roller .22 only the clamping screw 23 dissolved and through an opening in the housing 1, through which the clamping screw 23 is accessible, be pulled away got to. Then the feed roller 22 easily get extended.

This state is shown in FIG.

The servo motor side, first section 8 of Harmonic and the servo motor side first section 20 the lower shaft remain in place, such as in of Figure 2 is shown. So they will not be moved. The servo motor remote, second section 9 of the harmonic and the servo motor remote second portion 21 of the lower shaft are in dissolved clamping screws 11, 23 in the direction the arrow C has been moved axially. This is the lie Feed rollers 10, 22 free and can be removed from the waves become. It should be noted that in the figure 3 the axial distances of the components exaggerated drawn large are. The free space between the respective sections, that is their distance must be so large be that the rollers for removal in the radial direction can be moved freely.

Reference is now made to FIGS. 8 and 10. The servo motor side, first section 8 of the harmonic is about a roller bearing 32 in a later to be described Rocker 33, i. the swing section 33a stored. The lubricant space of the rolling bearing 32 is by means of Seals 34a, 34b sealed.

The servomotor remote, second section 9 of Harmonic is about rolling bearings 35 in the swing section 33b stored. The lubricant space of the rolling bearing 35 is by means of Seals 36a, 36b sealed.

The servo motor side, first section 20 of the Lower shaft is mounted on a rolling bearing 36 in the housing 1. The lubricant space of the rolling bearing 36 is by means of a seal 37 sealed.

The servomotor remote, second section 21 of Lower shaft is mounted on roller bearings 38 and 92 in the housing 1. The lubricant space of the rolling bearing 38 is by means of Seals 39a, 39b sealed.

So it is obvious that all bearings the shaft sections 8,9,20,21 each in their own Lubricant or lubricating oil chambers are arranged and thus the above-mentioned removal of the feed rollers 10,22 without any opening of lubricant chambers is feasible. Thus, the corresponding roll changes the feed rollers 10, 22, very easy to perform.

According to a first preferred embodiment is the stored in the rocker 33 harmonic, the means exactly that stored in the swing section 33a Servomotor side, first shaft section 8 of the harmonic in drive connection with the first servomotor 1.

The first shaft section 8 is provided with a Oldham coupling 40 is connected, of which in Fig. 7b the cross-plate 41 is shown separately. This Oldham clutch 40 is necessary because the first shaft section 8 (and obviously all associated with him Parts of the device) transverse movements relative to the stationary Drive shaft 6 of the servomotor 2 performs.

This Oldham clutch 40 is of an upper Spur gear 42 followed, with a lower spur gear 43 meshes, which with the servomotor side, first Shaft portion 20 of the lower shaft is connected.

The connection of the upper spur gear 42 with the drive shaft 6 of the servomotor 2 is performed by a multi-part clamping sleeve with a first clamping sleeve part 44 and a second clamping sleeve part 45.

The interaction of the clamping sleeve parts 44, 45 takes place by means of ring clamping elements 46th The clamping screws are indicated by the reference numeral 47.

The upper spur gear 42 is integral with formed the second clamping sleeve part 45, whereby a considerable savings in moving masses is achieved.

As a preferred embodiment of the servomotor is close Part of the Oldham clutch also in one piece with formed the second clamping sleeve part 45.

According to another preferred embodiment There are no spur gears, so the lower one Feed roller 22 only by frictional engagement with the metal strip 7 is rotated.

A still further preferred embodiment is in Figures 8, 9, 9a shown. In this version the top roller 10 is frictionally engaged with the metal band rotates.

In this embodiment, the servo motor side second shaft portion 20 of the lower shaft from the servomotor 2 driven. In this case, this shaft section 20 formed integrally with the second clamping sleeve part 45, so again there is a minimum rotating mass.

On a threaded spindle housing 67 is a further servomotor 48 arranged. His electronic Control, i. whose housing is indicated at 49.

This servomotor 48 serves to drive a Threaded spindle 50.

The servomotor 48 is merely an example to consider the drive of the threaded spindle 50. It can also 48 different drives from the servo motor to be available. The drive shaft of the servomotor 48 is indicated by the reference numeral 51. The connection between the drive shaft 51 of the servo motor 48 and the threaded spindle 50 takes place by means of a multipart clamping sleeve, a first clamping sleeve part 52, a second Clamping sleeve part 53 and ring clamping elements 54 has. The Clamping sleeve parts 52, 53 are by means of clamping screws 55 curious against each other.

The second clamping sleeve part 53 is over a Claw clutch 113 connected to the threaded spindle 50. The threaded spindle 50 is in turn via rolling bearings 56 and 112 mounted in the threaded spindle housing 67 or housing 1.

Thus, the threaded spindle 50 is independent stored free of play by the servo motor 48.

Because of the fact that ring clamping elements for connection Serve with the smooth motor shaft, can be a standard Servomotor, so no custom made used become.

On the threaded spindle 50 is an adjusting nut 57 arranged.

On this adjusting nut 57 is a double-armed Lever 93 with a first arm 94 and a second Arm 95 stored. This lever 93 is in the present Description text referred to as the second double-armed lever 93.

From Figure 4 it can be seen that the Adjusting nut 57 has a square cross-sectional shape and in a likewise a square cross-sectional shape having interior of the first double-armed Lever 93 is inserted. This is the adjusting nut 57 secured against twisting.

In the first arm 94 of a first double-armed Lever 93, a bolt 58 is inserted. This bolt 58 protrudes through a slot 59 in a connecting rod 96th

This connecting rod 96 is seated on an eccentric disc 97, which via a shaft 98 with a third drive motor 99, for example, a servo motor, drivingly connected is. The control of the drive motor is indicated by the reference numeral 100.

The second arm 95 of the first double-armed Lever 93 is a tab 101 on the first arm 102 of a hinged second double-armed lever 103. The second double-armed lever 103 is mounted on a shaft 60. The second arm 104 of the second double-armed lever 103 is fork-shaped, as in FIGS. 4 with the fork levers designating reference numerals 65, 66th is shown.

The shaft 60 is in the threaded spindle housing 67th sealed by means of seals 61, 62 oil-tight, so that a closed threaded spindle housing 67 as a closed Lube space is present in which the threaded spindle 50 and the components described maintenance are arranged in a closed space.

In particular, it can be seen from FIG. 4 that the shaft 60 at both ends of the threaded spindle housing 67 protrudes and that the fork lever 65, 66 are clamped on the protruding ends.

These fork levers 65 and 66 are about a Ball-head connection to an upper shaft portion 68 or 69 one generally designated 70, and 71, respectively Control rod articulated, with lower shank sections 72 and 73 are screwed. The described shaft sections are by means of lock nuts 74 and 75 against a Twisting secured.

The control rods are at their lower end hinged to the rocker 33.

The rocker 33, in which the upper feed roller 10 is stored at its other end connected to a shaft 79. This shaft 79 is in the housing 1 stored. The bearings 80, 80a are in FIG. 5 located.

It is thus apparent that the rocker 33 with the upper feed roller 10 mounted therein the shaft 79 take place swivel movements take place can. Thus, the upper feed roller 10 against the lower Feed roller 22 with the located thereon Metal band 7, which advanced in the direction of arrow B. is, and moved against and away from this become.

In the figure 6 are also the tape inlet table 81 and the tape outlet table 82 drawn, on which tables the metal band 7 on both sides of the lower Feed roller 22 rests.

The rocker 33 is by compression springs 83, 84th clamped against the lower feed roller 22.

The contact pressure of the compression springs 83, 84 is by means of threaded spindles 85, 86 and lock nuts 87, 88, which are supported on the threaded spindle housing 67, set.

The adjustment of the contact pressure is carried out with Help of reading the position of the on the compression springs 83, 84 resting discs 89, 90 on the scale 91. Obviously is in the compression springs 83, 84 each have a scale assigned.

The feed device described is to determines a ribbon-shaped blank 7, e.g. a metal band 7, one with tools for intermittent editing fed to the belt-shaped blank equipped press.

In the figure 13, these feed device and its associated press 76, a punch press, schematically recorded.

The punch press 76 has a drive 77 on. This drive 77 can, as the expert in general is known to comprise an electric motor having a Crankshaft or a shaft with eccentric discs has. This crankshaft or eccentric disc is in Drive connection with a connecting rod 78. At this connecting rod 78, a ram 105 is articulated. The ram 105 carries an upper tool 106, thus in the operation of the punch press 76 is moved up and down. The upper tool 106 is compatible with processing tools, e.g. Stamp 107 equipped. Next is the upper tool 106 with fishing pins 108th equipped, each having a conical head section 109 have.

As is well known, are in operation before impacting the processing tools, e.g. the punch 107 on the band-shaped blank 7 für.die actual processing the fishing pins 108 in pre-punched Holes in the blank 7 moves in order to precisely this Center. In this case, the upper feed roller 10 of the lower feed roller 22 briefly by a small Strekke lifted, so no clamping force on the band-shaped Blank 7 is exercised. This position of the upper Feed roller 10 is referred to as Zwischenlüftstellung.

Further, in FIG. 13, the fixed one Lower tool 110 and the control device 111 of the Punching press 76 drawn.

It can be seen that the control devices 49, 110 of the feed device and the punch press 76 communicate with each other, since the operation of the feed device matched to the operation of the punch press 76 have to be.

In the figure 10, the positions of the schematic parts of the feed device shown shown in continuous operation. Rotate in continuous operation the upper feed roller 10 and the lower feed roller 22, which are driven by the servo motor 2 ago intermittently, so that the band-shaped blank 7 as general is known to be progressively advanced. It works the (electronic) control device 49 of the feed device with the (electronic) control device 111 a punch press 76 together, see Figure 13. The Punching press 76 has a moving upper tool 106 and a fixed lower tool 110. The upper tool 106 is connected to a plunger 105. The pestle 105 is driven by a rotary drive 77, e.g. electric motors and crankshaft or eccentric shaft, via a connecting rod 78 driven, the connecting rod 78 purely schematically the Drive connection between the drive 77 and the plunger 105 represents.

Thus, the plunger is between an upper Totpunktstellung and a bottom dead center position.bewegbar.

The thickness of the strip-shaped blank 7 and according to the distance between the upper feed roller 10 and the lower feed roller 22 is in the Figure 10 with the letter E shown.

To a new ribbon-shaped blank 7, ie For example, a metal strip between the upper feed roller 10 and the lower feed roller 22 insert To be able to, the upper feed roller 10 must be raised be so that they have a given distance D from the lower feed roller 22 which is larger than the Distance E is. This distance D and the lifted Position of the upper feed roller 10 are in the figure 11th shown.

This position of the feed roller 10 is in the professional world referred to as Hochlüftposition.

To set this high-lift position the control devices 49 and 111 of the feed device and the punch press 76 is operated so that the ram 105 of the punch press from the bottom dead center position located away and that the connecting rod 96 located from the top dead center position. In which specific positions the plunger 105 and the connecting rod 96 is irrelevant, as long as the Plunger is not in the bottom dead center position. General, and this is known to the skilled person, however, become the control devices 49 and 111 of the feed device and the punch press is operated such that the plunger 105 of the punch press 76 in the top dead center position located and that the connecting rod 96 in the bottom dead center position is located. The following description goes from these latter dead center positions out. Are the dead center positions reached, is the adjusting nut 57 by a corresponding rotation the threaded spindle 50 is lowered.

The bolt 58 is due to the of the Compression springs 82, 84 via the rocker 33 and the lever devices 93 and 103 at the lower end of the slot 59 at.

By the downward movement of the Adjusting nut 57 is the first arm 94 of the first double-armed Lever 93 pivoted up and her second arm 95 pivoted down. This second arm 95 pulls the first arm 102 of the second double-armed lever device 103 also down. Thus, the second arm 104 of the second double-armed lever device 103 pivoted upwards. Consequently, the control rod assembly 68-75 lifted and thus the rocker 33 with the upper feed roller 10 mounted therein Hochlüftposition the upper feed roller 10 pivoted in which they the said distance D from the lower Feed roller 22, so that a new band-shaped Blank 7 can be inserted.

For continuous operation, the upper feed roller must 10 rest on the band-shaped blank 7, wherein through the upper feed roller 10 and the lower feed roller 22 a clamping force for a frictional engagement on the strip-shaped blank 7 must be exercised.

This clamping force is due to the compression springs 83, 84 generated. So the bolt 58 is not allowed to open anymore the lower end of the slot 59 rest. This will be the adjusting nut 57 by rotating the threaded spindle 50 lowered from the high ventilation position until the upper Feed roller 10 rests on the band-shaped blank 7. By a continued lowering movement of the adjusting nut 57, the first double-armed lever 93 is forced one To perform pivoting movement, since the rocker is not moves more because the upper feed roller 10 through the Compression springs 83, 84 resting on the band-shaped blank 7 is held. The said pivoting movement causes that the first arm 94 with the bolt 58 upwards pivots, so that the bolt 58 in the running hole 59 between whose ends are located. That means that the connecting rod 96 can perform strokes, without that an action on the bolt 58 takes place.

Another movement during operation the feed device with the punch press is the Zwischenlüftbewegung.

It has been mentioned above that one Upper tool 106 of a punch press with gripping pins 108 for precise positioning of the strip-shaped blank 7 can be equipped.

To enable positioning, the strip-shaped blank 7 exposed during a short period. This means that the upper feed roller 10 for a short time from the strip-shaped blank 7 in a Zwischenlüftstellung must be lifted.

This Zwischenlüftstellung is by the Connecting rod 96 causes.

For the time being, the punch press 76 is in the stroke position driven, in which the intermediate ventilation takes place should and in which position the conical head sections 109 of the catching pins 108 partially in the positioning holes retracted. This position can be seen in FIG.

In this position is the plunger 105 of the punch press 76 in an angular position in front of the lowest dead center position. Between this angular position and the bottom dead center position is thus an angular distance available.

The connecting rod 96 of the feeding device is now at the same time by the actuation of its drive motor 99 in a position before its top dead center position moved up. Thus, between this angular position and the top dead center also an angular distance available.

The one mentioned in connection with the punch press Angular distance is equal to that of the feed device existing angular distance.

Now, the adjusting nut 57 by rotating the threaded spindle 50 moves downward. This comes the bolt 58 to rest against the lower end of the slot 59. The adjusting nut 57 is then further down moves, so that due to the now occurring pivoting movements the lever devices and the rocker 33 the upper feed roller 10 releases the band-shaped blank. In this released state of the band-shaped blank manually detectable loose. This position of the adjusting nut 57 becomes along with the respective angular positions stored in the control devices 49 and 111.

This means that in continuous continuous operation the connecting rod 96 with the slot 59 relative to Bolt 58 can move freely without the bolt being affected is, with the exception that when the connecting rod 96 the above-mentioned angular position before the top dead center position of the connecting rod 96 reaches the lower end of the Langloches 59 grabs the bolt 58, lifts it up and after passing through the top dead center position is, the bolt 58 is released again.

Claims (11)

1. Apparatus for a intermittent feeding of a strip shaped blank (7) to a punch press which is equipped with tools adapted for a intermittent working of the strip shaped blank (7), which feeding apparatus includes a housing (1) and a threaded spindle housing (64) arranged on the housing (1), a upper feeding roller (10) mounted on a upper shaft (8, 9), a lower feeding roller (22) mounted on a lower shaft (20, 21), which feeding rollers (10, 22) are adapted to a grip the blank (7) to be fed by clamping same at both its sides and to feed same intermittently by a intermittent rotational movement, of which shafts (8, 9; 20, 21) at least one is drivingly connected to a intermittently operating electric servomotor (2) and the upper shaft (8, 9) is supported in a rocker which is pivotally mounted at said housing through a rocker shaft (79), by means of which it is movable towards and away from said lower shaft (20, 21), characterized by a motor (48) with a threaded spindle (50) and a control apparatus (49), a adjusting nut (57) arranged on the threaded spindle (50) and adapted to be moved along same by a rotational movement of the threaded spindle (50); a drive motor (99) and a eccentric disc (97) driven by the drive motor on which a rod (96) is supported which has at an end remote from the eccentric disc (97) an elongate hole (59) extending at least approximately parallel to the threaded spindle (50); by a first double arm lever unit (93, 94, 95) supported on the adjusting nut (57) and a second double arm lever unit (103; 102; 104) supported on a shaft (60) which is supported in the threaded spindle housing (64), which first double arm lever unit (93, 94, 95) includes a first arm (94) which engages the rod (96) and a second arm (95) which is pivotally mounted to a connecting strip (101) which in turn is pivotally mounted to a first arm (102) of the second double arm lever unit (103; 102, 104) onto which second arm (104) a control rod unit (68 - 75) is pivotally mounted which in turn is pivotally mounted to the rocker (33); and by a pressure spring assembly (82, 84) arranged between the rocker (33) and the threaded spindle housing (67), which is adapted to press the rocker (33) with the upper shaft (8, 9) with the upper feeding roller (10) supported therein onto the lower shaft (20, 21) with the lower feeding roller (22).
2. Feeding apparatus according to claim 1, characterized in that the threaded spindle (50) is mounted through roller bearings (56, 112), free of play in the threaded spindle housing (67) and the housing (1), so that the threaded spindle (50) is positioned precisely.
3. Feeding apparatus according to claim 2, characterized in that the sleeve (53) is a part of a multi-part clamping sleeve (52, 53, 54) into which the drive shaft (51) of a adjusting motor (48) of a adjusting apparatus projects, characterized by an adjusting motor (48) with a drive shaft (51) which is drivingly connected through multi-part clamping sleeve (52, 57, 54) followed by a jaw clutch coupling (113) to the threaded spindle (50).
4. Feeding apparatus according to claim 1, characterized in that the second arm (104) of the second double arm lever unit (103; 102, 104) is shaped as forked lever (65, 66) which is pivotally mounted through ball end connections to a respective part (68; 69) of a respective control rod (71, 72) forming a part of a control rod assembly (69 - 75).
5. Feeding apparatus according to claim 4, characterized in that the shaft (60) is sealed against the threaded spindle housing (67) by means of sealing rings (61; 62), so that the threaded spindle housing (67) forms a closed oil chamber.
6. Feeding apparatus according to claim 5, characterized in that each control rod unit (68 - 75) comprises threadingly engaged rod sections (68, 70, 69, 71) allowing a length adjustment.
7. Feeding apparatus according to claim 1, characterized in that the first arm (94) of said first double arm lever unit (93; 94, 95) engages the rod (96) through a bolt (58) which extends through the elongate hole (59).
8. Method of operating the feeding apparatus of claim 1, in which the feeding apparatus comprises a control apparatus (49) and co-operates,with a press (76) which has a moveable upper tool (106) and a stationary lower tool (110), which upper tool (106) is mounted to a punch (105) which is moveable between a top dead center position and a bottom dead center position, and comprises a press control apparatus (111) which communicates with the control apparatus (49) of the feeding apparatus, and in which the elongate hole (59) of the rod (96) which is movable between a top dead center position and a bottom dead center position has a upper and a lower end, the first arm (94) of the first double arm lever unit (93; 94, 95) engages the rod (96) by a bolt (58) extending through the elongate hole (59), whereby in order to insert a fresh strip shaped blank (7) between the upper feeding roller (10) and the lower feeding roller (22) the upper feeding roller (10) is moved into a high lift position in order to set a predetermined distance (D) between the upper feeding roller (10) and the lower feeding roller (22), characterized in that in order to set the high lift position of the upper feeding roller (10) the two mentioned control apparatuses (49; 111) are controlled in such a manner, that the ram (105) is controlled to move into its top dead center position and the rod is controlled to move into its bottom dead center position.
9. Method according to claim 8, characterized in that the ram (105) and the rod (96) are kept stationary and the adjusting nut (57) is lowered by a rotating of the threaded spindle (50), whereby the bolt (58) comes to lie onto the lower end of the elongate hole due to the force extended by the pressure spring assembly (82, 84) via the rocker (33) and the lever units (93; 94, 95 and 103; 102, 104), so that the first arm (94) of the first double arm lever unit (93; 94, 95) is pivoted upwards and its second arm (95) is pivoted downwards, the first arm (102) of the second double arm lever unit (103; 102, 104) is pivoted downwards and the second arm (104) is pivoted upwards, so that the control rod unit (68 - 75) is lifted due to these pivoting movements and accordingly the rocker (33) with the upper feeding roller supported therein is pivoted upwards into the high lift position of the upper feeding roller (10).
10. Method of operating the feeding apparatus according to claim 1, in which the feeding apparatus comprises a control apparatus (49) and co-operates with a press (76) which has a moveable upper tool (106) and a stationary lower tool (110), which upper tool (106) is mounted to a punch (105) which is moveable between a top dead center position and a bottom dead center position, and comprises a press control apparatus (111) which communicates with the control apparatus (49) of the feeding apparatus, and in which the elongate hole (59) of the rod (96) which is movable between a top dead center position and a bottom dead center position has a upper and a lower end, the first arm (94) of the first double arm lever unit (93; 94, 95)engages the rod (96) by a bolt (58) extending through the elongate hole (59), characterized in that the rod (96) is moved into a position remote from its top dead center position, the adjusting nut (57) is moved downwards by a rotating of the threaded spindle (54) until the upper feeding roller (10) comes to lie on the strip-shaped blank (7) due to the pressure extended by the pressure springs (82; 84) onto the rocker (33), in which position the bolt (58) is at a distance from both ends of the elongate hole (59), so that the stroke movements of the rod (96) are possible at a stationary state of the bolt (58).
11. Method of operating the feeding apparatus according to claim 1, in which the feeding apparatus comprises a control apparatus (49) and co-operates with a press (76) which has a moveable upper tool (106) and a stationary lower tool (110), which upper tool is mounted to a punch (105) which is moveable between a top dead center position and a bottom dead center position, and which comprises a press control apparatus (111) which communicates with the control apparatus (49) of the feeding apparatus, and in which the elongate hole (59) of the rod (96) which is moveable between a top dead center position and a bottom dead center position, has a upper and a lower end, the first arm (94) of the first double arm lever unit (93; 94, 95) engages the rod (96) by a bolt (58) extending through the elongate hole (59), which punch (105) is driven by a rotating drive (77) and the eccentric disc (97) of the rod (96) is driven by a drive motor (99), which upper tool (106) has positioning pins (108, 109) for a precise positioning of the strip shaped blank (7) in the press (76) during the working of same, which positioning pins (108, 109) are moved into prepunched positioning holes in the strip shaped blank (7) and which positioning pins (108, 109) include a conical head portion (109), whereby the upper feeding roller (10) is moved away from the bottom feeding roller(22) into a intermediate lifted position as soon as the conical head portions (109) are moved partly into the positioning holes and thereafter set again onto the strip shaped blank (7) as soon as the conical head portions (109) have been lifted partly out of the positioning holes, characterized in that in order to set the intermediate lift position, the punch (105) is brought by its rotating drive (77) into a angular position ahead of its bottom dead center position, in which angular position the conical head portions (109) of the positioning pins (108, 109) project only partly into the positioning holes, in which state the eccentric disc (97) of the rod (96) attains a angular position ahead of the top dead center position, whereby the angular distance of the punch (105) between said angular position and the bottom dead center position equals the angular distance of the eccentric disc (97) between its said angular position and the top dead center position, and thereafter the adjusting nut (57) is moved downwards, so that the bolt (58) comes to rest onto the bottom end of the elongate hole (59) and the adjusting nut (57) is moved still more further down until the strip shaped blank (7) is loose due to the lifting off of the upper feeding roller (10) by the movement transmitted through the lever units (93; 94, 95) and the control rod assembly (68 - 75) and rocker (33), and that the position attained by the adjusting nut (57) for mentioned angular position of the eccentric disc (97) and the corresponding angular position of the punch (105) are stored in the corresponding control apparatuses (49, 111).

Images