JPH061503A - Method and apparatus for adjusting the tension of moving strips - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a method and apparatus for adjusting the tension of a moving strip of material. When the tensile force is suddenly and rapidly attenuated (abrupt stop), a tension force which at least partially compensates for the attenuated tensile force and at least approximately maintains the tension of the belt-like material is provided. In order to carry out, a tension force mechanism 32 and a tension force are applied to the strip-shaped material guide portion 7
Means for applying the tensioning mechanism to the strip material, the tensioning mechanism being configured not to operate as long as a predetermined work tensioning force acts on the strip material, and when the tensioning force suddenly attenuates. Is provided with an operating device 48 for activating the tensioning mechanism and replenishing the dampened tensioning force and applying a tensioning force to the strip material which at least partially maintains the tension of the strip material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adjusts the tension of a moving strip of material in such a manner that the strip of material is unwound from a storage roller under a pulling force that imparts tension to the strip and is fed to a processing station. On how to do.

Furthermore, the present invention relates to a rewinding device for rewinding a strip-shaped material from a storage roller, a strip-shaped material guide provided with a means for feeding the strip-shaped material along a predetermined feed path, and a strip-shaped material tensioner for the strip-shaped material. With a pulling device for applying a pulling force for pulling it out of the storage roller underneath.

[0003]

2. Description of the Prior Art A method and apparatus of the type described at the outset comprises a continuous strip of material, in particular a strip of paper.
Alternatively, it is used to treat materials, for example synthetic material sheets or metal sheets or combinations thereof, ie to treat or process these materials. The strip material is unwound from a storage roller, which is usually rotatably supported, and passes through a strip material guide to a treatment device,
For example, it is drawn into a processing device or a processing device. For this purpose, the treatment device comprises a withdrawing roller, which exerts a pulling force on the withdrawing roller strip, which is withdrawn from the storage roller with a suitable strip tension. The material to be treated is generally sensitive,
Therefore, it can be processed only under a limited load-this is true of modern eco-friendly paper (Umweltpapier) -but once selected and adjusted the strip tension is always as constant as possible. It is desirable to maintain.

In order to maintain a constant pulling force in this way, the strip-shaped material guide portion is usually provided with an adjusting device for adjusting the strip-shaped material tension. This adjustment makes it possible to work within the range of fluctuations in the tension of the strip material which occur under normal working tension, but--typically when the machine is stopped rapidly--pulling forces. When is suddenly reduced, it becomes impossible to work. This is because the adjusting device responds too slowly to the sudden and rapid damping of the strip tension. This is especially the case in which the strip-shaped material guide is formed as a dust-retaining part with a stationary deflecting roller and a deflecting roller which swings in a vertical direction, and the vertical direction of the swiveling deflecting roller for adjusting the tension of the strip-shaped material. This can be said when a change in the directional position is detected.

[0005]

The problem underlying the present invention is to further improve a device of the type described at the outset. In particular, the tension of the band-shaped material should be such that at least one of the tension forces is substantially maintained even when the pulling force suddenly suddenly decreases.

[0006]

SUMMARY OF THE INVENTION According to the present invention, when the tensile force is suddenly and rapidly attenuated (abrupt stop), the tension at least partially compensates the attenuated tensile force and at least approximately maintains the tensile force. It is solved by applying a force to the strip material.

According to another aspect of the invention, the feed path for the strip of material is extended to provide tension. According to another advantageous configuration of the present invention, the strip-shaped material is sequentially turned and guided through a large number of rolls, and the distance between the rollers arranged one behind the other for imparting tension is expanded. At the same time, the storage roller is braked during the tensioning of the strip material. With this configuration, the speed of the unwound strip-shaped material is adjusted according to the attenuation of the tensile force, and is uniformly reduced. This makes it easier to maintain the tension of the strip material due to the additional tensioning force according to the invention. By applying additional tension to the strip material, the tensioning of the strip material according to the invention is such that the tension of the strip material is so suddenly abrupt that it is no longer possible to maintain the tension of the strip material by means of a predetermined strip tension adjustment. Even if you do, it will be maintained. In this case, the additional tension forces make up for the dampening tensile forces and give the strip material tension necessary for the operation without friction and defects. This is especially due to the other construction according to the invention,
Withdrawing the band-shaped material from the storage roller to the treatment device through the turning roller row of the dust-retaining section with a predetermined tensile force, and alternately, passing the band-shaped material in the dust-retaining section through the stationary turning roller and the swinging turning roller. Guiding, varying the spacing of the oscillating turning roller with respect to the stationary diverting roller depending on the tension of the strip material, and at least one oscillating diverting roller in stationary displacement when the treatment device suddenly stops suddenly. It is achieved by exerting a tensioning force on the strip material which supplements the tensioning force which is damped by forcing it away from the roller.

The separation movement of the oscillating turning rollers from the stationary diverting rollers causes the oscillating turning rollers to move to a strip-shaped material by actuating drive means for activating the oscillating turning rollers when the treatment device suddenly stops suddenly. Are continuously held in contact with each other. This causes the strip material to be loaded uninterrupted with tension, which keeps the tension of the strip material at least to the extent required for a substantially defect-free operation.

The problem underlying the invention in an apparatus of the type mentioned at the outset is that according to the invention a tensioning mechanism is provided in the strip-shaped material guide and means for applying a tensioning force to the strip-shaped material. That the tensioning mechanism is configured not to operate as long as a predetermined work tension force is applied to the strip material, and that the tensioning force mechanism is actuated when the tension force is suddenly attenuated and the tension force is reduced. It is solved by the provision of a manipulating device for replenishing the web and applying tension to the web which at least partially maintains the web tension.

Further construction features of the device according to the invention are set out in claims 8-18. In this case, claims 8 and 9 describe advantageous structural features of the device according to the invention. Claim 10 discloses a means for adjusting the tensioning force which is adapted to the respective requirements of the respective band-shaped material. Claims 11 and 16 characterize the drawer device. Claims 12 and 17 relate to the structure of the strip-shaped material guide portion,
In this case, claim 12 describes the structure of the strip-shaped material guide portion which responds to the fluctuation of the strip-shaped material tension, and claim 17 the strip-shaped material guide portion is provided with a strip-shaped material tension adjusting portion for effective work of the apparatus. It is intended for the strip-shaped material guide. An excellent tensioning mechanism is described in claims 13 and 14. In order to prevent the oscillating turning roller of the strip-shaped material guiding part from being swung by the movable member of the tensioning mechanism and to prevent the adjustment of the strip-shaped material tension from being impeded,
It is provided in the disengagement device of the tensioning mechanism from the deflecting roller of the associated strip-shaped material guide during the effective work of the device. Claim 18 relates to a rewinding device provided with a braking mechanism, which acts as an adjusting member of the adjusting device for adjusting the tension of the strip material in the effective work of the device and when the pulling force suddenly attenuates In cooperation with the force mechanism, it acts as a means for a reliable and load-free maintenance of the strip tension.

Hereinafter, the present invention will be described in detail with reference to the embodiments illustrated in the accompanying drawings.

[0012]

1 shows a schematic side view of an embodiment of the device according to the invention. Reference numeral 1 indicates a rewinding device with a bearing base 2. A storage roller 3 is rotatably supported on the bearing base 2, and the strip-shaped material 4 is attached from the storage roller.
Is withdrawn. This strip material comprises paper, a synthetic material sheet or a metal sheet or similar strip material. The drawing device 6 draws the strip-shaped material 4 through the strip-shaped material guide portion 7.
As the drawing device 6, a treatment device in the form of a processing machine or a processing machine is provided. The strip-shaped material guide portion 7 is formed as a dust holding portion including a stationary turning roller 8 and a swinging turning roller 9. By passing around these rollers, the strip material 4 is guided in the form of loops 11. The swing-turning roller 9 is rotatably supported by a slider 14 which is movable in the vertical direction along the guide member 12 in the direction of arrow 13. Therefore, the slider 14 follows the movement of the swing turning roller 9 and keeps the swing turning roller 9 at the same level.

The slider 14 comprises two turning rollers 17 and 1
They are joined by a belt or chain 16 which is guided around 8. A gear 19 is provided on the shaft of the lower turning roller 18, which meshes with a second gear 22 carrying a cam plate 21. The lever 24, which is supported so as to be tiltable along the bearing 23, carries a control roller 26 that cooperates with the cam plate 21 at one end.
Piston 2 of working cylinder 28 with the other end
Act on 7. This working cylinder is connected to the disc brake 31 of the rewinding device 1 via a pressure conduit 29.

The movement of the slider 14 in the direction of the arrow 13 responds to variations in the tension of the strip-shaped material, and thus the belt 1
6, through the cam plate 21, the two-arm lever 24, the operating slit 28 and the braking mechanism 31, it is possible to adjust the tension of the band-shaped material. The adjustment of the band-shaped material tension will be described later in detail.

According to the invention, the strip material guide 7 is provided with a tensioning mechanism 32, which in the embodiment shown in FIG. 1 does not have a piston rod. ) 33. Such belt cylinders are commercially available, for example Germany 7000 Stuttgart 30.
It is marketed by Robert Bosch. The belt cylinder 33 drives a connecting element 34 which connects a guide bush 37, which is driven by a belt 36 of the belt cylinder 33, with the belt or the chain 16. The belt 36 of the belt cylinder 33 is fixed to the piston 38 at both ends, and rotates via the turning roller 39.

On one side of the piston 38, the belt cylinder 33 has a switching valve 41 and an adjustable pressure regulator 42.
It is connected to the pressure source 43 via. Switching valve 41
An operating mechanism 44 is provided to switch between the two, and the operating mechanism is operated by the machine control unit 46. An emergency stop switch 47 is connected to this machine control unit. The emergency stop switch 47, the machine control unit 46, the actuation mechanism 44, and the pressure supply units 41, 42, 43 are an operating device 48 for actuating the tension mechanism 32.

In operation, the pulling device 6 exerts a working pulling force on the strip material 4, which is thereby withdrawn from the storage roller 3 and through the strip material guide 7 under the predetermined strip material tension. Move to device 6 direction. When the tension of the strip-shaped material is constant, the oscillating deflection roller 9 maintains the relative position of the strip-shaped material guide 7 with respect to the stationary deflection roller 8 without changing. If, on the other hand, the tension of the strip material 4 changes, the oscillating turning roller 9 correspondingly moves upwards or downwards in the direction of the arrow 13. As the strip tension increases, the oscillating turning roller 9 moves upwards together with the slider 14 causing the belt 16 associated with the slider 14 to move, so that the lower turning roller 18 acts as a watch hand. Rotate in the opposite direction. This movement is controlled by the control cam plate 2 via the gears 19 and 22.
1 is rotated in the direction of the hands of the clock, whereby the actuating cylinder 28 is correspondingly unloaded via the two-arm lever 24 and the braking mechanism 31 of the storage roller 3 connected via the pressure conduit 29 is relaxed. It This damps the tension of the strip material and thus the slider 14 moves downwards in the direction of the arrow 13 together with the oscillating turning roller 9. This movement is again transmitted to the actuating cylinder 28 via the belt 16, the deflecting roller 18, the gear wheels 19, 22, the cam plate 21 and the two-arm lever 24, which actuates the storage roller 3 again.
Brake on. In this way, the adjustment of the strip tension is carried out during the useful work of the device.

If, in such a device, the pulling device 6 suddenly dampens or interrupts the pulling force exerted by the strip material 4, the strip material tension of the strip material 4 will first completely collapse. Because the inertial mass of the storage roller 3 avoids a rapid stop of this storage roller, the slider 14 extends the debris reserve 11 in the strip-shaped material guide 7 due to the further rotation of the storage roller 3. It is possible to follow by descending at a very slow speed together with the oscillating turning roller 9 so that the desired strip tension is maintained continuously during this process. That is, until the swinging and diverting roller moves downwards, it again drops into the refuse and puts a high load on this refuse.
It is suspended in the inside in the unloaded state. However, this leads to undesired damage, especially for sensitive strips, for example environmentally friendly papers with a very low tear strength.

Thus, in accordance with the present invention, a tensioning mechanism 32 is provided which maintains the tension of the strip 4 of material 4 when the pulling force is suddenly attenuated. When the pulling device 6 and thus the pulling force acting on the strip-shaped material 4 is interrupted, for example by an emergency stop-switch 47, at the same time the actuating mechanism 44 is controlled via the control mechanism 46, which controls the switching valve 4.
Switch 1 to the open position. As a result, air pressure is applied from the pressure source 43 to the chamber 49 above the belt cylinder 33 via the pressure regulating member 42, and the belt cylinder 33 is moved to the piston 3
Move 8 down. Chamber 5 below the belt cylinder
1 is connected to the atmosphere and is therefore free of pressure. The piston 38 moves the strip-shaped material guide 7 and the connecting member 34 together with it via the belt 36 when it moves downwards. Since the connecting member is rigidly connected to the belt or chain 16, this belt or chain is driven in the direction of the hands of the timepiece, forcing the slider 14 together with the oscillating deflection roller 9 to move downward. The lowering speed of the piston 38 is adjusted by the pressure adjusting member 42 of the air pressure supply portion, and the swinging and diverting roller 9 is always in contact with the strip-shaped material in the dust holding portion 11 during the lowering movement of the pulling device 6 when the pulling device 6 is stopped urgently. In a state, whereby a tension is exerted on the strip material 4, which tension force at least partially compensates for the dampening tension force, which approximately corresponds to the tension of the strip material obtained by the tension force during at least the useful work. Hold it under the band material.

Simultaneously with the downward movement of the slider 14, the cam plate 2
1 rotates in the direction opposite to the direction of the hands of the clock, and tightens the braking mechanism 31 of the storage roller 3 via the two-arm lever 24 and the piston 27. In this way, due to the continuous braking of the storage roller and the extension of the feed path of the strip-shaped material 4 made possible by the downward movement of the slider 14, for example, when the drawing device 6 suddenly stops, the pulling force is increased. Sudden damping maintains the strip tension necessary for proper operation of the device.

When the withdrawal device 6 is started again, this withdrawal device exerts a new working pulling force on the strip material 4, which in turn increases the strip material tension when the storage roller 3 is still braked. , This allows slider 1
4 is moved upward together with the swinging and turning roller 9.
At the same time when the drawer device 6 is started, the control mechanism 46 and the operating mechanism 4
The switching valve 41 is switched via 4 and the chamber 49 above the belt cylinder 33 is thus evacuated. Slider 1
The belt 1 now moves the piston 38 of the belt cylinder, which is now free to move in the cylinder without pressure, into the belt 1.
6, The belt is carried through the connecting rod 34 and the belt 36. Simultaneously with the lowering movement of the slider 14, the braking mechanism 31 is released in the manner described above, whereby the strip tension is damped again and adjusted to an optimum value.

FIG. 2 shows another embodiment of the tension mechanism 32 in the same section as that shown in FIG. The same components are designated by the same reference numerals as in FIG. 1 and have not been described here again. In this embodiment, the tension mechanism 32
As a compressed air motor 52 is provided. The compressed air motor drives the deflecting roller 18 below the belt or the chain 16 via the belt driving mechanism 53 and the belt pulley 54 when the drawing device 6 is rapidly stopped.
A clutch mechanism (not shown) is provided between the belt pulley 54 and the lower turning roller 18, and the clutch mechanism is used for the lower turning induced by the ascending / descending movement of the compressed air motor 52 and the slider 14. The disengagement / engagement of the power connection during the movement of the roller 18 is performed. When the pulling force is suddenly abruptly attenuated, for example by an emergency stop of the drawing device 6, this clutch mechanism is engaged and a connection to the compressed air motor 52 is formed. The compressed air motor is actuated by the actuating device 48 which is constructed similarly to that shown in FIG.

Lower turning roller 18 and compressed air motor 5
The clutch mechanism provided in the power flow between the two interrupts the power flow in the normal operating state between the slider 14 and the compressed air motor 52. As a result, it is possible to prevent the slider 14 from carrying the compressed air motor when the slider 14 moves up and down due to fluctuations in the tension of the band-shaped material. This allows a very fine adjustment of the strip tension. Since the clutch mechanism is engaged with the pulling device 6 at the same time as the pulling force is cut off, even if the pulling force is suddenly attenuated, the tension force is immediately and surely exerted from the compressed air motor 52 via the lowering roller 18 and the slider 14.
Is transmitted to the swinging and turning roller 9.

In order to limit the upward movement of the slider 14 when the strip tension rises too much, a compression spring 56 is provided which simultaneously moves downwards when the slider 14 moves further upward. It cushions the moving connecting arm 34, which progressively blocks and finally limits the upward movement of the slider 14.

[0025]

The invention has the advantage that the strip tension is maintained even during sudden and rapid damping of the tensile forces that occur, for example, when the machine is stopped rapidly. This makes the load on the strip uniform and limits it without damaging it. Abrupt changes in the tension of the strip material, which can be damaging in particularly sensitive strip materials, are avoided.

[Brief description of drawings]

1 is a schematic side view of a device according to the invention.

FIG. 2 is a diagram showing another embodiment of the tension mechanism shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unwinding device 2 Bearing stand 3 Storage roller 4 Strip material 6 Drawing device 7 Strip material guide section 8 Stationary turning roller 9 Swing turning roller 11 Trash holding section 12 Guide section 14 Slider 16 Belt / chain 17, 18, 39 Turning Rollers 19, 22 Gears 23 Bearings 24 Two-arm levers 26 Control rollers 27, 38 Pistons 28 Actuating cylinders 29 Pressure conduits 31 Disc brakes 32 Tension force mechanisms 33 Beck cylinders 34 Connecting members 36 Belts 41 Switching valves 42 Pressure adjusting members 43 Pressure sources 44 Operation mechanism 46 Machine control unit 47 Emergency stop switch 48 Operation device 49, 51 Chamber 52 Compressed air motor 53 Belt drive mechanism 54 Belt pulley 56 Compression spring

Claims (18)

[Claims] 01. A method for adjusting the tension of a moving strip of material in the manner that the strip of material is unwound from a storage roller under a pulling force that imparts tension to the strip and is fed to a treatment station. A moving strip, characterized in that when the pulling force suddenly suddenly decays (stops suddenly), the strip-like material is provided with a tensioning force which at least partially supplements the attenuated pulling force and at least approximately maintains the tension of the strip-shaped material. A method for adjusting the tension of materials. 02. The method according to claim 1, characterized in that the feed path of the strip material is extended to provide a tensioning force. A strip-shaped material is sequentially diverted and guided through a large number of rollers, and the spacing between the rollers provided one behind the other for imparting tension is expanded. The method according to Item 1 or 2. 04. Method according to claim 1, characterized in that the storage roller is braked at the same time during the tensioning of the strip material. 05. Pulling the strip material from the storage roller to the processing device through the deflection roller row of the dust holding portion with a predetermined tensile force, and alternately, the strip material and the oscillating roll in the dust holding portion. The directional deflection roller, the oscillating deflection roller depending on the tension of the strip material to change the spacing relative to the stationary deflection roller, and the at least one oscillating deflection roller being stationary when the processing device suddenly stops suddenly. 5. A method as claimed in any one of the preceding claims, characterized in that the strip material is subjected to a tensioning force which supplements the tensile force which is damped by forcing it away from the turning roller. 06. The oscillating turning rollers are maintained in continuous contact with the strip of material by actuating a tensioning mechanism that causes the oscillating turning rollers to move when the processing device suddenly stops. The method according to claim 5, wherein 07. A rewinding device for unwinding the strip material from a storage roller, a strip material guide provided with means for feeding the strip material along a predetermined feed path and the strip material under strip material tension. In a device for adjusting the tension of a moving strip-shaped material, which comprises a pull-out device for applying a pulling force for pulling out from a storage roller, a tensioning mechanism (32) and a tensioning force are applied to a strip-shaped material guide (7). Band material (4)
Means (9) for applying the tensioning force to the strip, the tensioning mechanism being configured not to operate as long as a predetermined work tensioning force is applied to the strip material, and the tensioning force being suddenly attenuated. An actuating device (48) is provided for actuating the tensioning mechanism and for replenishing the dampened tensioning force and for applying a tensioning force to the strip material which at least partially maintains the tension of the strip material. A device for adjusting the tension of a moving strip of material. 08. The strip-shaped material guide (7) comprises a stationary deflecting roller (8) and at least one deflecting roller (9) movable relative to the stationary deflecting roller, which is movable. A diverting roller (9) is provided as a means for applying a tensioning force and is operatively associated with a tensioning mechanism (32) which does not operate while the working tensioning force is acting, and When the pulling force is suddenly attenuated, the tensioning force mechanism (3) actuated via the operating device (48).
2) is configured to separate the movable turning roller (9) from the stationary turning roller (8) in order to exert a tensioning force on the band-shaped material (4) that at least substantially supplements the dampened pulling force. 8. The device according to claim 7, characterized in that 09. At least one of the above, wherein the strip-shaped material guide portion (7) is formed as a dust-retaining portion having a stationary turning roller (8) and a turning roller (9) swinging in a vertical direction. A tensioning mechanism (32), in which an oscillating turning roller (9) is provided as a means for imparting a tensioning force to the strip-shaped material and which does not operate while the working tensioning force acts.
And a tensioning mechanism (32) that operates when the pulling force suddenly attenuates is configured to separate the oscillating turning roller (9) from the stationary turning roller (8). The device according to claim 7 or 8, characterized in that. 10. An operating device (48) for actuating the tensioning mechanism (32) comprises a device (42) for adjusting and controlling the tensioning force applied to the strip (4). Device according to any one of claims 7 to 9, characterized. 11. A device according to any one of claims 7 to 10, characterized in that a device for treating and / or processing the moving strip material (4) is provided as a drawing device (6). The described device. 12. The relative position of the oscillating deflection roller (9) of the strip-shaped material guide (7) relative to the stationary deflection roller (8) is tensioned with the strip-shaped material unless the tensioning mechanism (32) is operating. 10. Device according to claim 8 or 9, characterized in that it is adapted to change freely depending on. 13. A tensioning mechanism (32) is provided with a pressure-loadable piston-cylinder unit (33), and the piston (38) of this piston-cylinder unit is provided.
Is operatively connected to the oscillating turning roller (9) of the strip-shaped material guide (7) and is adapted to follow the movement of the oscillating turning roller unless this piston cylinder unit is operating. Device according to any one of claims 7 to 12, characterized in that 14. Device according to claim 7, characterized in that a compressed air motor (52) is provided as the tensioning mechanism (32). 15. A clutch mechanism is provided in the working connection (16, 18, 53) between the tensioning mechanism (32) and the oscillating deflection roller (9), and the clutch mechanism is provided from the deflection roller. 15. A device according to claim 13 or 14, adapted to interrupt the flow of force to the tensioning mechanism while the work pulling force is acting. 16. The withdrawal device (6) comprises a quick stop switch (emergency stop switch) (47), which is associated with an operating device (48) of the tensioning mechanism (32). 16. The quick stop-switch actuation is configured to be actuated via an actuating device of the tensioning mechanism. Equipment. 17. An adjusting device for adjusting the tension of the strip-shaped material is attached to the strip-shaped material guide portion (7) while the working tensile force is applied thereto. The device according to claim 1. 18. The rewinding device (1) comprises a storage roller (3).
A braking means (31) for braking the
The braking means being coupled to an adjusting device, the adjusting device being arranged to control the braking device so that the tension of the strip material is constant during the application of the working pulling force, and 7. The control means according to claim 7, characterized in that the control means are adapted to be actuated by actuation of the tensioning mechanism (32) immediately upon a sudden damping of the pulling force.
The device according to any one of 7 to 7.