EP1348500B1 - Device to intermittently feed a band-shaped blank into a press - Google Patents

Abstract

The device has at least one intermittently operating servomotor with a drive shaft, upper (10) and lower (22) rollers on upper (8,9) and lower (20,21) shafts for engaging the product (7) to transport it by intermittent rotation, at least one roller with a drive connection to the servomotor. Each shaft has a section on the servomotor side and a section remote from the servomotor and a roller is clamped between the first and second shaft sections.

Description

The present invention relates to a device for intermittently feeding a strip-shaped blank to a press equipped with tools for intermittently processing the strip-shaped blank, which device comprises at least one intermittently operating electric servomotor with a drive shaft, a top roller arranged on a harmonic, and a bottom shaft lower roller, of which rollers at least one is in driving connection with the at least one servomotor, which rollers are intended to grasp the blank to be supplied by a mutual clamping and to advance intermittently by an intermittent rotational movement. Such a press is from the document US 2 320 659 A known.

The presses mentioned here are, in particular, high-speed presses with stroke rates of up to 2,000 strokes / minute. These presses are equipped with tools for processing one (or more) supplied strip-shaped blank, wherein punching, embossing, bending, riveting, making threads, etc. are performed.

The movement of the band-shaped blank, which is processed in the press, takes place intermittently, so gradually. During a processing step, eg punching, obviously no forward movement of the strip-shaped blank takes place. Often it is accurately positioned by means arranged in the tools fishing pins, so locked. After the completion of the processing step, for example, after a punching tool has been moved out of the punched hole, the band-shaped blank is advanced by a predetermined distance and stopped again, so that the next processing step can be performed.

The supply or advancing movement of the strip-shaped blank is effected by one (or more when entering and exiting the press arranged) feed or feed apparatus (or feed apparatus), which subtracts the band-shaped blank intermittently from a supply roll and feeds the press.

Such feeders have become known in different designs. According to one of these known embodiments, the feed apparatus has clamping tongs. These clamps perform a linear reciprocation. To move the band-shaped blank is clamped by the pliers. During the backward movement of the pliers of the band-shaped blank is released. Furthermore, the blank is temporarily released during certain operations during the punching process itself. Another known embodiment has oscillating, rotating movements exporting segment rollers. For advancing the ribbon-shaped blank is clamped by the rotating in the feed direction segment rollers. During the reverse rotation in the starting position of the band-shaped blank is released from the segment rollers. Also in this case, the blank is released temporarily during certain operations during the punching process itself. Due to the high number of strokes fast-running, modern presses occur by the oscillating operation very high accelerations and delays, which lead to high inertial forces of the components of the feeders. Further inertial forces are conditioned by the blank to be processed, drawn from a supply roll itself.

As a supplement to the known mechanically driven feed devices are known feed devices, which are driven by an electric servomotor. Such servomotors are manufactured and sold by several companies. The operation of these servomotors is controlled electronically. As feed elements, these new feed apparatuses have completely cylindrical feed rollers arranged on shafts which rotate intermittently always in the same direction of rotation.

When performing a machining operation in a press, it is often necessary to achieve an extremely precise alignment of the strip-shaped blank, for example when the press associated with the feed device is equipped with a following tool. According to a procedure, positioning pins are used, which are moved into pre-punched holes shortly before the actual processing step, in order to allow precise punching. During the actual processing step, e.g. punching a hole, the band-shaped blank is held and centered only by these positioning pins and the clamping is also canceled by the rollers of the feed apparatus. This means that at least one of the rollers must be lifted off the band-shaped blank. Thus, this roller, together with the shaft carrying it, must perform not only an intermittent rotation movement but also an oscillating release movement perpendicular to the band-shaped blank.

While now the use of the known servomotors in feeders eliminates a number of previous mechanical components with their inertial masses, known servo-motor-driven feeders still contain a considerable number of mechanical components with their inertial masses.

Since these components perform due to their masses at the high accelerations and decelerations and torsional movements, which adversely affect the precision of processing, and further tend to oscillate, even in the case of a drive by servo motor these components still great attention must be paid.

It is known an embodiment of a feed apparatus with a servo motor, in which the drive shaft of the servo motor with the roller shaft and the roller is formed integrally and the drive connection between said drive or roller shafts takes place at the servo motor end of the waves.

However, this training has various the precision of processing negative affecting disadvantages.

Since the one roller shaft is integrally formed with the motor shaft, the motor shaft and thus the entire drive motor must be designed as a special production. It is not possible to use a commonly available standard engine.

Depending on the product to be produced in each case, different band-shaped blanks are fed to a stamping press and such strip-shaped blanks are also processed differently. Since the feed rollers must be adapted to the band-shaped blanks to promote the same accordingly, the feed rollers must be replaced from case to case. In addition, feed rollers are exposed to wear and must be reground. This means that even in such a case worn feed rollers are replaced by fresh feed rollers, since obviously the operation of the punch press should not be interrupted during the extremely precise regrinding process.

In the known embodiment mentioned must be completely removed to remove the rolls in a roll change the integral with the roll shaft motor shaft. In addition, the oil chambers for the lubricating oil of the existing bearings must be opened.

The take place by means of gears drive transmission from the integrally formed with the motor shaft roller shaft on the other roller shaft, ie from the harmonic to the lower shaft, takes place at the servotomorfernen end of the waves. This leads to a long Verdrehstrecke from the middle of a (directly driven) roller to the other roller, which has an extremely negative effect on the synchronous behavior of the two rollers and thus the feed accuracy. Since a radial movement of the harmonic takes place against the lower shaft and away from it, a coupling device permitting this movement, eg an Oldham clutch, must be present between the two shafts. In the aforementioned known embodiment, this coupling is also arranged at the servo motor end of the waves, whereby a further, complex storage of the Oldham shaft is present and an additional, rotating masses causing rotation is present.

The aim of the invention is to provide a device for intermittently feeding a strip-shaped blank to a equipped with tools for intermittent processing of the strip-shaped blank press whose components have minimal inertial masses, have symmetrical Verdrhrcken and allows extremely simple removal of the rolls for a roll change thereof.

Another object of the invention is to provide a device of the kind set forth in which each shaft has an axially servo motor-side first shaft section and a second shaft section located at an axial distance from the first shaft section, and a respective roller is disposed between the first shaft section and the second shaft portion is clamped.

Yet another object of the invention is to provide an apparatus for intermittently feeding a belt-shaped blank in which the second shaft portion remote from the servo motor is axially penetrated by a tensioning screw supporting it which is in screw engagement with the first shaft portion close to the servo motor by means of which tensioning screw the two shaft sections against each other and thus against the respective arranged therebetween roller are tensioned, so that the roller arranged between the two shaft sections is kept clamped.

A still further object of the invention is to provide a device for intermittently feeding a belt-shaped blank in which the drive shaft of the servomotor is connected to the top roller via a coupling device allowing radial relative movements.

Still another object of the invention is to provide a device for intermittently feeding a belt-shaped blank, in which the drive shaft of the servomotor is connected to the harmonic via a multi-part coupling unit enabling radial relative movements, and the lower shaft is freely rotatably supported in a frame of the device. Another object of the invention is to provide an apparatus for intermittently feeding a belt-shaped blank in which each shaft has an axially servomotor-side first shaft portion and a second shaft portion located away from the first shaft portion at an axial distance from the first shaft portion, a respective roller between the first and second shaft portions is held clamped the second shaft portion, and in which the servo motor side, the first shaft portion of the lower shaft is in communication with the drive shaft of the servomotor.

The advantages achieved by the invention are essentially to be seen in the fact that the moving components have a small inertial mass, that short torsional distances are present and the maintenance of components exposed to wear can be carried out very easily, by the removal of components to be serviced very easily can be.

Due to the screw connection between the shaft sections, dismantling of the rollers can take place during a roll change by means of tools outside without the oil spaces in which the lubricating oil is present must be opened.

It can be used a standardized series engine, which allows a great deal of flexibility in relation to the driven components, in particular a further development thereof. Further, no special storage of the shaft of the Oldham coupling is necessary, since this is taken over by the engine mount. Since no additional shaft coupling is required, the total torque becomes smaller.

Because the shaft ends are completely exposed on the servomotor side, when disassembling the rollers, the shaft portions remote from the servo motor, after the tension screws have been removed, merely need to be slightly displaced to remove the rollers.

• 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 im vergrösserten Massstab das Detail A in der Figur 6;
• Figur 8 einen Schnitt durch einen Teil der Vorrichtung, bei dem der Servomotor mit dem Antriebszahnrad und der Kreuzscheibe der Oldham-Kupplung demontiert sind;
• Figur 8a den Flansch des Servomotors mit montiertem Antriebszahnrad und einem Teil der Oldham-Kupplung;
• Figur 8b die Kreuzscheibe der Oldham-Kupplung;
• Figur 9 einen Schnitt durch eine weitere Ausführung der erfindungsgemässen Vorrichtung;
• Figur 10 einen Schnitt durch einen Teil der in der Figur 9 gezeigten Vorrichtung , bei der der Antrieb für die Unterwalze demontiert ist; und
• Figur 10a den demontierten Antrieb für die Unterwalze gemäss der in der Figur 9 und Figur 10 gezeigten Ausführung.

Hereinafter, the object of the invention will be explained in more detail with reference to embodiments showing drawings. It shows:

• FIG. 1 a section through a first embodiment of the inventive device;
• FIG. 2 a part in FIG. 1 drawn on an enlarged scale;
• FIG. 3 the first and second portions of the upper shaft and the lower shaft and the upper and lower feed roller in an axially exploded view;
• FIG. 4 a section along the line IV-IV of FIG. 1 ;
• FIG. 5 a section along the line V - V of FIG. 1 ;
• FIG. 6 a section along the line VI-VI of FIG. 1 ;
• FIG. 7 on an enlarged scale the detail A in the FIG. 6 ;
• FIG. 8 a section through a part of the device, wherein the servomotor with the drive gear and the Oldham clutch disc are disassembled;
• FIG. 8a the flange of the servomotor with mounted drive gear and a part of the Oldham coupling;
• FIG. 8b the cross wheel of the Oldham clutch;
• FIG. 9 a section through a further embodiment of the inventive device;
• FIG. 10 a section through a part of in the FIG. 9 shown device in which the drive for the lower roller is dismantled; and
• FIG. 10a the disassembled drive for the lower roller according to the in the FIG. 9 and FIG. 10 shown execution.

The device has a housing 1. A first servomotor 2, of which simplified the electronic control 3 is indicated, is flanged at its flange 4 via bolts 5 on the housing 1.

This first servomotor 2 is controlled in a manner known per se such that it executes stepwise intermittent rotational movements. The duration and the extent of each step of the rotational movement are controlled depending on the processing to be carried out in the downstream press. This servomotor 2 has a drive shaft 6.

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

The harmonic wave is divided into an axial servo-motor-side first shaft section 8 and a servo motor-remote, second shaft section 9 arranged at an axial distance from this first shaft section 8. Between these shaft sections 8, 9, an upper feed roller 10 is kept clamped.

The servo motor remote, second shaft portion 9 is axially penetrated by a clamping screw 11 supported on it, which is in screw engagement with the servo motor side, first shaft portion 8.

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

This upper feed roller 10, which consists of several parts and is very lightweight, has 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. Please refer FIG. 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 inner space 12 has the shape of a truncated cone shell.

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

It is thus apparent that after the tightening screw 11 has been tightened, the mutually corresponding truncated cone-shaped sections 16, 18 and 17, 19 abut each other, so that the upper feed roller 10 arranged therebetween is clamped and guided.

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

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

The lower shaft 20, 21 is also divided into an axially servo motor-side, first shaft portion 20 and arranged at an axial distance from this first shaft portion 20 remote from the servo motor, second shaft portion 21. Between these shaft sections 20, 21, the lower feed roller 22 is kept clamped.

The servomotor remote, second shaft portion 21 is axially penetrated by a clamping screw 23 supported on it, which is in screw engagement with the servo motor side, first shaft portion 20.

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

This lower feed roller 22, which consists of several parts and is very lightweight, has the shape of a hollow circular cylinder with an axial interior 24 having an inner peripheral wall 25 and two end surface portions 26 and 27.

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 inner space 24 has the shape of a truncated cone shell.

The mutually facing ends of the shaft portions 20, 21 also have a truncated cone-shaped portion 30 and 31, respectively.

It can thus be seen that after the tightening screw 23 has been tightened, the mutually corresponding truncated cone-shaped sections 28, 30 and 29, 31 abut each other, so that the lower feed roller 22 arranged therebetween is clamped and guided.

It is also apparent that to remove the lower feed roller 22, only the clamping screw 23 is released and must be pulled away through an opening in the housing 1, through which the clamping screw 23 is accessible. Then the feed roller 22 can be removed easily.

This condition is in the FIG. 3 shown.

The servo motor side, first portion 8 of the harmonic and the servo motor side first portion 20 of the lower shaft remain in place, such as in the FIG. 2 is shown. So they will not be moved. The servo motor remote, second portion 9 of the harmonic and the servomotor remote second portion 21 of the lower shaft have been axially displaced with dissolved clamping screws 11, 23 in the direction of arrow C. Thus, the feed rollers 10, 22 are exposed and can be removed from the waves. It should be noted that in the FIG. 3 the axial distances of the components are exaggerated large. The free space between the respective sections, that is to say their spacing, only has to be so great that the rollers can be moved freely in the radial direction for removal.

It will now be on the FIGS. 8 and 10 directed. The servo-motor-side, first section 8 of the harmonic is mounted via a rolling bearing 32 in a rocker 33 to be described later, ie the rocker section 33a. The lubricant space of the rolling bearing 32 is sealed by means of seals 34a, 34b.

The servomotor remote, second portion 9 of the harmonic is mounted on roller bearings 35 in the swing section 33b. The lubricant space of the rolling bearing 35 is sealed by means of seals 36a, 36b.

The servomotor-side, first portion 20 of the lower shaft is mounted in the housing 1 via a roller bearing 36 and 92. The lubricant space of the rolling bearing 36 is sealed by means of a seal 37.

The servomotor remote, second portion 21 of the lower shaft is mounted in the housing 1 via a rolling bearing 38. The lubricant space of the rolling bearing 38 is sealed by means of seals 39a, 39b.

It can therefore be seen that all the bearings of the shaft sections 8, 9, 20, 21 are arranged in respectively separate lubricant or lubricating oil chambers and thus the abovementioned removal of the feed rollers 10, 22 can be carried out without any opening of lubricant chambers. Thus, the corresponding roll change of the feed rollers 10, 22, very easy to perform.

According to a first preferred embodiment, the harmonic mounted in the rocker 33, that is to say exactly, the servo-motor-side, first shaft section 8 of the harmonic shaft mounted in the rocker section 33a is in driving connection with the first servomotor 1.

The first shaft portion 8 is connected to an Oldham coupling 40, of which in the Fig. 8b the cross-plate 41 is shown separately. This Oldham coupling 40 is necessary because the first shaft portion 8 (and obviously all parts of the apparatus connected to it) makes transverse movements relative to the fixed drive shaft 6 of the servomotor 2.

This Oldham coupling 40 is followed by an upper spur gear 42 which meshes with a lower spur gear 43 which is connected to the servo motor side, first shaft portion 20 of the lower shaft.

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

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

The upper spur gear 42 is integrally formed with the second clamping sleeve portion 45, whereby a considerable saving in moving masses is achieved.

As a preferred embodiment, the Servomotornahe part of the Oldham coupling is also formed integrally with the second clamping sleeve part 45.

According to a further preferred embodiment, no spur gears are present, so that the lower feed roller 22 is rotated only by frictional engagement with the metal strip 7.

A still further preferred embodiment is in Figures 9 . 10, 10a shown. In this embodiment, the upper roll 10 is rotated by frictional engagement with the metal strip.

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

Subsequently, the Lüftbewegung the harmonic, that is, the upper feed roller 10 associated parts of the device will now be described.

On the threaded spindle housing 67, a further servo motor 48 is arranged. Its electronic control, i. whose housing is indicated at 49.

This servo motor 48 oscillates, so changes its direction of rotation after each rotational movement step.

This servo motor 48 serves to drive a threaded spindle 50. 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 by means of a multi-part clamping sleeve, which has a first clamping sleeve part 52, a second clamping sleeve part 53 and ring clamping elements 54. The clamping sleeve parts 52, 53 are clamped by means of clamping screws 55 against each other.

The second clamping sleeve part 53 is mounted via roller bearings 56 in the threaded spindle housing 67. Further, the threaded spindle 50 is formed integrally with the second clamping sleeve part 53. For mounting, therefore, the threaded spindle 50 is installed together with the second clamping sleeve part 53 via the roller bearing 56 in the threaded spindle housing 67. Thereafter, the first clamping sleeve part 52 is placed on the second clamping sleeve part 53 and the drive shaft 51 of the servo motor 48 is inserted. Thus, the servo motor 48 is aligned with the threaded spindle 50.

In other words, the threaded spindle 50 is supported without play independently of the servo motor 48, since its positioning depends on the existing position of the threaded spindle 50.

The fact that ring clamping elements serve to connect to the smooth motor shaft, a standard servo motor, so no special production can be used.

On the threaded spindle 50 an adjusting nut 57 is arranged. This adjusting nut 57 is about sliding blocks 58 in engagement with a crank lever in the form of a two-armed lever 59th From the FIG. 4 It can be seen that the adjusting nut 57 has a nose 93 which engages in the crank lever 59, whereby the adjusting nut 57 is secured against rotation.

This double-armed lever is formed in two parts. The first part consists of the fork-shaped first arms 63, 64, in each of which the sliding block 58 is arranged. These arms 63, 64 extend to a shaft 60, the Lüftwelle, which is mounted in the threaded spindle housing 67, so that the double-armed lever 59 is mounted in the threaded spindle housing 67. The shaft 60 is sealed by means of seals 61, 62 oil-tight, so that a closed threaded spindle housing 67, as closed lubricating oil space is present, in which the threaded spindle 50 and the components described above are arranged maintenance-free in a closed space.

The shaft 60 protrudes out of the threaded spindle housing 67 at both ends. At these ends fork lever 65, 66 clamped. The fork levers 65, 66 form the second part of the double-armed lever 59th

These fork levers 65 and 66 are articulated via a ball and socket connection to an upper shaft section 68 and 69 of a control rod 70 and 71, respectively, which upper shaft sections 68 and 69 are bolted to lower shaft sections 72 and 73, respectively.

Characterized in that the upper shaft portions 68 and 69 of the control rods 70 and 71 are bolted to the lower shaft portions 72 and 73, the length and, accordingly, the position of the rocker 33 can be adjusted accurately. The shaft portions 68 and 69 and 72 and 73 are secured by means of a lock nut 74 and 75 against rotation.

The control rods 70 and 71, that is, their lower shaft portions 72 and 73, engage in the rocker 33, that is, in the two swing sections 33 a and 33 b.

In this case, the lower shaft portions 72 and 73 protrude through in each case an opening 76 of the rocker 33, in which opening 76 a shoulder 77 is arranged (see FIGS. 6 and 7 ). Further, each lower shaft portion 72 and 73 ends in a support head 78th

The rocker 33, in which the upper feed roller 10 is mounted, is connected at its the control rods 70 and 71 opposite end to a shaft 79. This shaft 79 is mounted in the housing 1. The bearings 80, 80 a of the shaft 79 are in the FIGS. 4 and 5 located.

It can thus be seen that the rocker 33 with the upper feed roller 10 mounted therein performs pivotal movements about the shaft 79 can. Thus, the upper feed roller 10 against the lower feed roller 22 with the metal strip 7 thereon, which is advanced in the direction of arrow B, and be moved away therefrom.

In the FIG. 6 In addition, the belt inlet table 81 and the belt outlet table 82 are shown, on which tables 81, 82, the metal strip 7 rests on both sides of the lower feed roller 22.

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

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

The setting is done by means of a reading of the position of resting on the compression springs 83, 84 discs 89, 90 on the scale 91. Obviously, two compression springs 83, 84 each associated with a scale.

It will be on the FIGS. 6 and 7 directed.

During operation of the device, the further servomotor 48 initially rotates in a first direction of rotation, so that the threaded spindle 50 rotates and causes a lowering of the control rods 70, 71. Thus, the rocker 33 is pivoted with the upper feed roller 10 mounted therein due to the compression springs 83, 84 down, ie against the lower feed roller 22. In the end position of this pivoting movement, the upper feed roller 10 is under the exertion of pressure on the lying on the lower feed roller 22 metal strip 7.

At this time, however, the further servo motor 48 continues to rotate in the same direction of rotation. This results in a no-lift, which is determined by the position of the support head 78 relative to the shoulder 77 FIG. 7 is given, that is, the support head 78 has a distance from the shoulder 77 on. The support head 78 thus acts no longer on the rocker 33 a. This guarantees that the roll contact pressure on the metal strip 7 is reliably retained by the compression springs.

Thereafter, when the direction of rotation of the other servo motor 48 is changed to rock the rocker 33, the servo motor 48 is accelerated before the support head 78 comes into abutment with the shoulder 77. Since thus for releasing the rocker 33 of the further servo motor 48 already rotates in the corresponding direction of rotation before a corresponding action on the rocker 33, with respect to the operation of the servo motor 48 has a longer acceleration time available, so that correspondingly the maximum stroke of the feed device and further the Maximalhubzahl the press is increased, so that the performance of the press is increased. LIST OF REFERENCE NUMBERS 1 casing 2 first servomotor 3 electronic control 4 motor flange 5 bolts 6 Drive shaft of the servomotor 2 7 Metal band, band-shaped blank to be supplied 8th Servomotor-side first section of the harmonic 9 Servomotor remote, second section of the harmonic 10 upper feed roller 11 clamping screw 12 Interior of the upper feed roller 13 Inner peripheral wall of the interior 14, 15 End surface portions of the upper feed roller 16 Transition area at 14 17 Transition area at 15 18 Truncated cone-shaped section of FIG. 8 19 truncated cone shaped portion of FIG. 9 20 servo motor side, first section of the lower shaft 21 Servomotor remote, second section of the lower shaft 22 lower feed roller 23 lower clamping screw 24 Interior of the lower feed roller 25 Inner peripheral wall of the interior 26, 27 End surface portions of the lower feed roller 28 Transition area at 26 (truncated cone) 29 Transition area at 27 (truncated cone) 30 truncated cone shaped portion of FIG. 20 31 truncated cone shaped portion of 21 32 Rolling bearings of 8 33 wing 33a rocker section 33b rocker section 34a, b Seals at 32 35 Rolling bearings of 9 36 roller bearing 37 Seal at 35 38 roller bearing 39a, 39b Seals at 38 40 Oldham coupling 41 Oldham 42 Upper spur gear 43 lower spur gear 44 first clamping sleeve part 45 second clamping sleeve part 46 Ring clamping elements 47 turnbuckles 48 another servomotor 49 electronic control 50 screw 51 Drive shaft of 48 52 first clamping sleeve part 53 second clamping sleeve part 54 Ring clamping elements 55 turnbuckles 56 roller bearing 57 adjusting nut 58 slide 59 Gate lever (double-lever) 60 Shaft, air shaft 61, 62 seals 63, 64 bifurcated, first arms of 59 65, 66 fork lever 67 Threaded spindle housing 68, 69 upper shaft section (ball-head connection) 70, 71 control rod 72, 73 lower shaft section 74, 75 locknut 76 Opening in the swingarm 77 shoulder 78 Contact head 79 (Swingarm) shaft 80, 80a Shaft Bearing B arrow 81 Tape feed table 82 Belt outfeed table 83, 84 compression springs 85, 86 screw 87, 88 locknut 89, 90 disc 91 scale C arrow 92 roller bearing 93 nose

Claims (27)

1. A device for intermittently supplying a band-shaped blank (7) to a press equipped with tools for intermittently working the band-shaped blank (7), which device has at least one intermittently operating electric servo (2), with a driving shaft (6), an upper roller (10) arranged on an upper shaft (8, 9) and a lower roller (22) arranged on a lower shaft (20, 21), at least one of which rollers (10, 22) is in a drive connection with the at least one servo (2), which rollers (10, 22) are intended to grip, through clamping on both sides, the blank (7) to be supplied and to advance it intermittently through an intermittent rotary movement, wherein each shaft (8, 9; 20, 21) has a first shaft portion (8; 20) located at the end closest to the servo axially and a second shaft portion (9; 21) remote from the servo and arranged at a distance axially from the first shaft portion (8; 20), and in that [sic] a respective roller (10; 22) is held clamped between the first (8; 20) and the second (9; 21) shaft portions, characterised in that each second shaft portion (9; 21) remote from the servo is traversed axially by a clamping screw (11; 23) supported thereon and in threaded engagement with the first shaft portion (8; 20) located close to the servo, by means of which clamping screw (11; 23) the two shaft portions (8, 9; 20, 21) are clamped against each other and thereby against the respective roller (10; 22) arranged therebetween, so that the roller (10; 22) arranged between the two shaft portions (8, 9; 20, 21) is held clamped.
2. A device according to claim 1, characterised in that each roller (10; 22) has the form of a hollow circular cylinder with an axial interior (12; 24) having an inner circumferential wall (13; 25) and two end face portions (14, 15; 26, 27), in that the transition region (16, 17; 28, 29) between the inner circumferential wall (13; 25) and the respective end face portions (14, 15; 26, 27) has the form of a truncated-cone shell, in that the facing ends of the shaft portions (8, 9; 20, 21) each have a further truncated-cone-shell-shaped portion (18, 19; 30, 31), which further truncated-cone-shell-shaped portions (18, 19; 30, 31) of the shaft portions (8, 9; 20, 21) contact the truncated-cone-shell-shaped transition regions (16, 17; 28, 29) of the rollers (10; 22).
3. A device according to claim 1, characterised in that the driving shaft (6) of the servo (2) is connected to a first spur gear (42), which first spur gear (42) is in the axial direction of the driving shaft followed by a multipart coupling device (40) enabling radial relative movements, which coupling device (40) is for its part connected to the upper shaft (8, 9) and which first spur gear (42) meshes with a second spur gear (43) connected to the lower shaft (20, 21).
4. A device according to claim 3, characterised in that the coupling device (40) has an Oldham coupling.
5. A device according to claim 3, characterised in that the first spur gear (42) is connected to the driving shaft (6) of the servo (2) by means of a multipart clamping sleeve device (44, 45, 46).
6. A device according to claim 5, characterised in that the first spur gear (42) is integral with a part (45) of the multipart clamping sleeve device (44, 45, 46).
7. A device according to claim 5, characterised in that a part of the multipart coupling device (40) is integral with a part (45) of the multipart clamping sleeve device (44, 45, 46).
8. A device according to claim 3, characterised in that the upper shaft (8, 9) is mounted in a link (33) so as to be movable towards the lower shaft (20, 21) and away therefrom.
9. A device according to claim 1, characterised in that the driving shaft (6) of the at least one servo (2) is connected to the first shaft portion (20), located at the end closest to the servo, of the lower shaft (20, 21).
10. A device according to claim 9, characterised in that the first shaft portion (20), located at the end closest to the servo, of the lower shaft (20, 21) is connected to the driving shaft (6) of the servo (2) by means of a multipart clamping sleeve device (44, 45, 46).
11. A device according to claim 10, characterised in that the first shaft portion (20), located at the end closest to the servo, of the lower shaft (20, 21) is integral with a part (45) of the multipart clamping sleeve device (44, 45, 46).
12. A device according to claim 1, characterised in that the upper shaft (8, 9) is in a drive connection with the at least one servo (2) and is mounted in a link (33) so as to be movable towards the lower shaft (20, 21) and away therefrom, the driving shaft (6) of the servo (2) being in a drive connection with the upper shaft (8, 9) via a coupling device (40) enabling radial relative movements.
13. A device according to claim 12, [characterised] in that a first spur gear (42) connected to the driving shaft (6) is arranged at a site between the servo (2) and the coupling device (40), which spur gear (42) meshes with a second spur gear (43) connected to the lower shaft (20, 21).
14. A device according to claim 12, characterised in that the coupling device (40) has an Oldham coupling.
15. A device according to claim 13, characterised in that the first spur gear (42) is connected to the driving shaft (6) of the servo (2) by means of a multipart clamping sleeve device (44, 45, 46).
16. A device according to claim 15, characterised in that the first spur gear (42) is integral with a part of the multipart clamping sleeve device (44, 45, 46).
17. A device according to claim 13, characterised in that a part of the multipart coupling device (40) is integral with a part of the multipart clamping sleeve device (44, 45, 46).
18. A device according to claim 12, characterised in that each roller (10; 22) has the form of a hollow circular cylinder with an axial interior (12; 24) having an inner circumferential wall (13; 25) and two end face portions (14, 15; 26, 27), in that the transition region (16, 17; 28, 29) between the inner circumferential wall (13; 25) and the respective end face portions (14, 15; 26, 27) has the form of a truncated-cone shell, in that the facing ends of the shaft portions (8, 9; 20, 21) each have further truncated-cone-shell-shaped portions (18, 19; 30, 31), which further truncated-cone-shell-shaped portions (18, 19; 30, 31) of the shaft portions (8, 9; 20, 21) contact the truncated-cone-shell-shaped transition regions (16, 17; 28, 29) of the rollers (10, 22).
19. A device according to claim 1, characterised in that the device has a housing (1) and the upper roller (10) is in a drive connection with the at least one servo (2), the driving shaft (6) of the servo (2) being connected to the upper shaft (8, 9) via a multipart coupling device (40) enabling radial relative movements and the lower shaft (20, 21) being mounted in the housing (1) so as to be freely rotatable.
20. A device according to claim 19, characterised in that the coupling device (40) has an Oldham coupling.
21. A device according to claim 20, characterised in that the multipart coupling device (40) is connected to the driving shaft (6) of the servo (2) by means of a multipart clamping sleeve device (44, 45, 46).
22. A device according to claim 21, characterised in that a part of the multipart clamping device (40) is integral with a part (45) of the multipart clamping sleeve device (44, 45, 46).
23. A device according to claim 19, characterised in that each roller (10; 22) has the form of a hollow circular cylinder with an axial interior (12; 24) having an inner circumferential wall (13; 25) and two end face portions (14, 15; 26, 27), in that the transition region (16, 17; 28, 29) between the inner circumferential wall (13; 25) and the respective end face portions (14, 15; 26, 27) has the form of a truncated-cone shell, in that the facing ends of the shaft portions (8, 9; 20, 21) each have a further truncated-cone-shell-shaped portion (18, 19; 30, 31), which further truncated-cone-shell-shaped portions (18, 19; 30, 31) of the shaft portions (8, 9; 20, 21) contact the truncated-cone-shell-shaped transition regions (16, 17; 28, 29) of the rollers (10; 22).
24. A device according to claim 1, characterised in that the lower roller (22) is in a drive connection with the at least one servo (2) and the upper shaft (8, 9) is mounted in a link (33) so as to be movable towards the lower shaft (20, 21) and away therefrom, the first shaft portion (20), located at the end closest to the servo, of the lower shaft (20; 21) being connected to the driving shaft (6) of the servo (2).
25. A device according to claim 24, characterised in that the first shaft portion (20), located at the end closest to the servo, of the lower shaft (20; 21) is connected to the driving shaft (6) of the servo (2) by means of a multipart clamping sleeve device (44, 45, 46).
26. A device according to claim 25, characterised in that the first shaft portion (20), located at the end closest to the servo, of the lower shaft (20; 21) is integral with a part (45) of the two-part clamping sleeve device (44, 45, 46).
27. A device according to claim 26, characterised in that each roller (10; 22) has the form of a hollow circular cylinder with an axial interior (12; 24) having an inner circumferential wall (13; 25) and two end face portions (14, 15; 26, 27), in that the transition region (16, 17; 28, 29) between the inner circumferential wall (13; 25) and the respective end face portions (14, 15; 26, 27) has the form of a truncated-cone shell, in that the facing ends of the shaft portions (8, 9; 20, 21) each have a further truncated-cone-shell-shaped portion (18, 19; 30, 31), which further truncated-cone-shell-shaped portions (18, 19; 30, 31) of the shaft portions (8, 9; 20, 21) contact the truncated-cone-shell-shaped transition regions (16, 17; 28, 29) of the rollers (10; 22).

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