HOLDING APPARATUS FOR THE END OF A SHEET COIL

Abstract

The holding device according to the invention for the sheet end 12 of a material web wound up to form a coil 1, which material web is received on a carrying shaft 44, comprises a clamping bar 34 on which several clamping pieces 35 are arranged so as to be displaceable and fixable along the longitudinal axis of the clamping bar 34, which is supported on the ends of the carrying shaft 44 by clamping and guiding units 36 via bearing pieces 45 and exerts a contact pressure between the bottom side of the sheet end 12 and the penultimate layer of the coil 1 and between the top side of the sheet end 12 and the clamping pieces 35, which contact pressure, together with the frictional forces resulting therefrom, secures the sheet end 12. For the purpose of mounting and dismantling the clamping bar 34, the compression springs 39 provided in the clamping and fixing units 36 are prestressed by hand-operated eccentric levers 47 engaging the pins 41 and 42 in such a way that said clamping bar can be placed onto the guide rods 43 without force and, respectively, can be removed therefrom, provided that the spring-loaded flaps 40 are manually prevented from locking into place on the toothing systems of the guide rods 43. With a decreasing unwinding radius, the spring-loaded flaps 40 will lock into place on the toothing systems of the guide rods 43 according to said decrease. The clamping pieces 35 arranged on the clamping bar 34 in a displaceable and fixable manner produce the required clearances for strappings 20 of the coil 1, which are present during the assembly and, respectively, are necessary before removal.

Description

The invention relates to a holding device for a sheet end of a material web wound up to form a coil, which material web is received on a carrying shaft.

Sheet metal working plants are already known in which any number of sheet coils (also of different kinds) are supplied from a storage area to a feed device of such plants using transport carts.

The sheet coils are usually received on clamping mandrels which have a carrying shaft in the middle and in which several clamping arms are arranged toward the inner surface of the coil. The coil is thereby fastened to the carrying shaft in a central and correct position.

It is now the object of the invention to provide a holding device of the initially described kind which meets the following requirements:

• • holding the end of the material web, in particular sheet web, wound up to form a coil safely and in a correct position,
  • mounting the holding device onto coils of any as-delivered condition (mainly onto coils which are fixed during transport and storage by strappings with sheet metal bands—frequently arranged along the periphery thereof) without using specific auxiliary means,
  • enabling a space-saving design of the storage areas for the coils,
  • unwinding the coils with both the outside and the inside facing upwards,
  • easy opening of the holding device in the feed device of the material web processing plant.

According to the invention, said object is achieved in that a clamping bar arranged parallel to the carrying shaft and extending across the width of the material web is clampable on the end side against the material web with a clamping device in each case, which always rests on the carrying shaft also on the end side.

Advantageous advanced embodiments of the invention are characterized in the dependent claims.

The holding device according to the invention comprises two component parts (arms) each provided at the projecting ends of the carrying shaft, which pull or push a clamping bar connecting those two component parts against the centre of the coil axis in order to thereby fasten the end of the wound-up material web to the coil itself.

If a sufficiently large tensile force/compressive force is now provided between the clamping bar and the coil axis, the end of the material web is held safely because of the contact pressure prevailing between the bottom side thereof and the penultimate layer of the coil and because of the same contact pressure prevailing between the top side thereof and the clamping bars and because of the frictional forces resulting therefrom, even if the above-mentioned component parts provided on both sides are mounted to the carrying shaft in principle in a loose (e.g., rotatable) manner.

The displaceable clamping pieces arranged on the clamping bar produce the required clearance for the strappings which generally are provided on the delivered coils. The holding device can be mounted to the coil without any problems despite those strappings—the sheet end can be fixed without any difficulties—and the strapping can then be removed safely.

The holding device is designed and mounted such that, if several coils with a longitudinal axis oriented in parallel are stored in a line in the storage area, no additional storage space is taken up by them.

The holding device allows the sheet web to be pulled off and also to be wound up, respectively, in a tangential manner by any kind of draw-in device of, e.g., sheet metal working machines.

Below, the invention is illustrated in further detail based on exemplary embodiments, with reference to the drawings.

FIG. 1 schematically shows a processing device for sheet coils.

FIG. 2a shows a side view of a sheet coil provided with a holding device, the holding device being designed with arms that are hooked in.

FIG. 2b shows a respective front view.

FIG. 3a shows a side view of a sheet coil provided with a holding device, the holding device being designed with arms mounted onto the carrying shaft.

FIG. 3b shows a respective front view.

FIG. 4a shows a side view of a sheet coil provided with a holding device, the holding device being designed with arms mounted onto the carrying shaft and the clamping force showing only small variations despite large differences in diameter.

FIG. 4b shows a respective front view.

FIG. 1 shows the storage area (stockpiling) of a sheet metal working plant with a random number of coils 1 which are set down on pillow blocks 2. Using a transport cart, which is not illustrated here, the respective coil 1 required by the plant is lifted from the pillow block 2 and placed into the feed device 3. Said device generally has a drive which supports the pulling-off of the sheet from the coil 1 and, respectively, accomplishes the winding of sheet which has not been processed by the plant. The holding device 4 according to the invention secures the end of the sheet web of the coil 1.

If the sheet metal working plant requires that, during processing of the sheet web, the outside of the coil 1 must lie on top, the coil 1 is deposited in the storage area according to depot variant A. If the sheet metal working plant requires that, during processing of the sheet web, the inside of the coil 1 must lie on top, the coil 1 is deposited in the storage area according to depot variant B.

FIG. 2a shows a side view of a sheet coil 1 provided with a holding device, the holding device being designed with arms that are hooked in. FIG. 2b shows the respective front view.

The holding device comprises a clamping bar 5 on which several clamping pieces 6 are arranged so as to be displaceable and fixable along the longitudinal axis of the clamping bar 5. The clamping bar 5 is securely connected on either end to one connecting rod 7 each. Those connecting rods 7 are received in longitudinal guides 8 in the hinge parts 10. The compression springs 9 located therebetween push the connecting rods 7 along with the clamping bar 5 with its clamping pieces 6 toward the centre of the carrying shaft 11, on which the coil 1 is stretched.

In the position which is shown (clamping position), a contact pressure prevails between the bottom side of the sheet end 12 and the penultimate layer of the coil 1—just like between the top side of the sheet end 12 and the clamping pieces 6. Said contact pressure and the frictional forces resulting therefrom secure the sheet end 12 against being unwound as well as against being extracted.

In the feed device 3, the two hinge parts 10 are pressed against existing stops 16 on lugs 14 provided therefor by means of appropriate actuators 15 in such a way that the carrying shaft 11 is able to run completely freely. The clamping bar 5 is likewise pressed against existing stops 19 on lugs 17 provided therefor by means of appropriate actuators 18 in such a way that the sheet web is able to run off completely freely. By means of the clamping elements 13 arranged on the two hinge parts 10, the compression springs 9 can be prestressed for the purpose of mounting (assembly operation) and dismantling (removal operation) in such a way that the holding device can, as a whole, be placed onto and removed from, respectively, the coil 1 with the carrying shaft 11. The clamping of the sheet end 12 is effected by loosening the clamping elements 13 during the assembly operation. The detachment of the sheet end 12 is effected by tightening the clamping elements 13 during the withdrawal operation.

The displaceable clamping pieces 6 on the clamping bar 5 enable the required clearances for strappings 20 of the coil 1, which generally are present during the assembly. They also enable the remainder of the coil to be strapped in a desired removal operation of the holding device.

FIG. 3a shows a side view of a sheet coil 1 provided with a holding device, the holding device being designed with arms mounted onto the carrying shaft. FIG. 3b shows the respective front view.

The holding device comprises a clamping bar 21 on which several clamping pieces 22 are arranged so as to be displaceable and fixable along the longitudinal axis of the clamping bar 21. The clamping bar 21 is connected on either end to one connecting rod 24 each by means of plug-and-socket connections 23. The connecting rods 24 are received in longitudinal guides 25 in the bearing pieces 27. The compression springs 26 located therebetween push the connecting rods 24 along with the clamping bar 21 with its clamping pieces 22 toward the centre of the carrying shaft 28, on which the coil 1 is stretched.

In the position which is shown (clamping position), a contact pressure now prevails between the bottom side of the sheet end 12 and the penultimate layer of the coil 1—just like between the top side of the sheet end 12 and the clamping pieces 22. Said contact pressure and the frictional forces resulting therefrom secure the sheet end 12 against being unwound as well as against being extracted.

In the feed device 3, the clamping bar 21 is pressed against existing stops 31 on lugs 29 provided therefor by means of appropriate actuators 30 in such a way that the sheet web is able to run off completely freely. Since the bearing pieces 27 are rotatably mounted onto the carrying shaft 28, they do not have to be disengaged separately.

By means of the clamping elements 32 arranged on the two bearing pieces 27, the compression springs 26 can be prestressed for the purpose of mounting (assembly operation) and dismantling (removal operation) in such a way that the clamping bar 21 can be inserted and removed, respectively, without force. Since the bearing pieces 27 are rotatably mounted onto the carrying shaft 28, they must be kept in the desired peripheral position during the assembly using fixing devices 33. The clamping of the sheet end 12 is effected by loosening the clamping elements 32 during the assembly operation. The detachment of the sheet end 12 is effected by tightening the clamping elements 32 during the withdrawal operation.

The displaceable clamping pieces 22 on the clamping bar 21 enable the required clearances for strappings 20 of the coil 1, which generally are present during the assembly. They also enable the remainder of the coil to be strapped in a desired removal operation of the holding device.

FIG. 4a shows a side view of a sheet coil 1 provided with a holding device, the holding device being designed with arms mounted onto the carrying shaft and the clamping force showing only small variations despite large differences in diameter. FIG. 4b shows the respective front view.

The holding device comprises a clamping bar 34 on which several clamping pieces 35 are arranged so as to be displaceable and fixable along the longitudinal axis of the clamping bar 34. The two ends of said clamping bar 34 are formed by clamping and guiding units 36. External guide tubes 38 are securely connected to the clamping bar 34. Internal guide tubes 37 rest on the guide rods 43, namely with a positive fit on toothing systems of the guide rods 43, via spring-loaded latches 40. In the position which is shown (clamping position), compression springs 39 located therebetween push the external guide tubes 38 along with the clamping bar 34 and the clamping pieces 35 toward the centre of the carrying shaft 44, on which the coil 1 is stretched.

In the position which is shown (clamping position), a contact pressure now prevails between the bottom side of the sheet end 12 and the penultimate layer of the coil 1—just like between the top side of the sheet end 12 and the clamping pieces 35. Said contact pressure and the frictional forces resulting therefrom secure the sheet end 12 against being unwound as well as against being extracted.

The guide rods 43 are received in the bearing pieces 45.

In the feed device 3, the clamping and guiding units 36 are pushed apart on lugs (pins) 41 and 42 provided therefor by means of appropriate actuators 46 (spreaders). The result is that the clamping bar 34 is lifted from the clamped sheet end 12 in such a way that the sheet web is able to run off completely freely. Since the bearing pieces 45 are rotatably mounted onto the carrying shaft 44, they do not have to be disengaged separately. If the final positions of the pins 41 and 42 end up lying symmetrically to the sheet plane of the sheet end 12 with the actuator 46 being spread apart, this kind of opening the holding device is applicable for both unwinding variants.

Since, during the unwinding operation, the feed device 3 fulfills the function of keeping the level of the sheet that has been pulled off tangentially constant also with a decreasing outside diameter of the coil, said device must continuously lift and lower, respectively, the centre of the sheet coil. During said operation, the guide rods 43 now slide permanently in the inner guide tubes 37, which are supported on the pins 42 by the spread-apart actuators 46. With a corresponding decrease in the outside diameter of the coil, the spring-loaded flaps 40 will lock into place on the guide rods 43 accordingly.

After loosening the spread of the actuators 46, the clamping rod 34 along with its clamping pieces 35 is pushed back toward the centre of the coil axis by the compression springs 39 along the guide rods 43 due to the support of the inner guide tubes 37 by the spring-loaded flaps 40, and the sheet end 12 is fastened to the coil 1.

Using an appropriate hand-operated eccentric lever 47, the compression springs 39 of the clamping and fixing units 36 can be prestressed via their pins 41 and 42 for the purpose of mounting (assembly operation) and dismantling (removal operation) in such a way that the clamping bar 34 can be inserted and removed, respectively, without force, provided that the spring-loaded flaps 40 are manually prevented from locking into place when the clamping bar 34 is being removed. Since the bearing pieces 45 are rotatably mounted onto the carrying shaft 44, they must be kept in the desired peripheral position during the assembly using fixation means 48.

The displaceable clamping pieces 35 on the clamping bar 34 enable the required clearances for strappings 20 of the coil 1, which generally are present during the assembly. They also enable the remainder of the coil to be strapped in a desired removal operation of the holding device.

Claims

1. A holding device for a sheet end (12) of a material web wound up to faun a coil (1), which material web is received on a carrying shaft (44), characterized in that a clamping bar (34) arranged parallel to the carrying shaft (44) and extending across the width of the material web is clampable on the end side against the material web with a clamping device (36) in each case, which always rests on the carrying shaft (44) also on the end side.

2. A holding device according to claim 1, characterized in that, on the clamping bar (34), two or several clamping pieces (35) are arranged so as to be displaceable along the longitudinal axis of the clamping bar (34) and optionally so as to be fixable on the clamping bar (34).

3. A holding device according to claim 1, characterized in that the clamping device (36) is supported on the end regions of the carrying shaft (44) via bearing pieces (45).

4. A holding device according to claim 1, characterized in that the clamping device (36) is also designed as a guiding device for the clamping bar (34) toward the guide thereof which is radial relative to the coil (1).

5. A holding device according to claim 4, characterized in that the clamping and guiding devices (36) are supportable with a positive fit on toothing systems of guide rods (43) of the clamping device (36), via spring-loaded latches (40).

6. A holding device according to any of claim 1, characterized in that the clamping bar (44) is movable against the clamping direction by means of actuators engaging the clamping devices (36) for the purpose of lifting the clamping bar (34) from the coil (1).

7. A holding device according to claim 6, characterized in that the actuators (46) are supportable on support lugs (41, 42) of the clamping device (36).

8. A holding device according to any of claim 5, characterized in that the guide rods (43) of the clamping device (36) are received in bearing pieces (45) which are rotatably mounted onto the carrying shaft (44).

9. A holding device according to any of claim 6, characterized in that final positions of the support lugs (41) and (42) end up lying symmetrically to the plane of the sheet end (12) with the actuators (46) being spread apart so that opening and closing of the holding device can be accomplished by an actuator (46) independently of the desired unwinding variant.

10. A holding device according to any of claim 1, characterized in that the distance between the carrying shaft (44) and the clamping bar (34) is reducible during an unwinding operation according to the decrease in the diameter of the coil.

11. A holding device according to claim 10, characterized in that, with a decreasing unwinding radius of the coil (1), the spring-loaded latches (40) will lock into place on toothing systems of the guide rods (43) according to said decrease.

12. A holding device according to claim 3, characterized in that, during the assembly of the clamping bar (34), the bearing pieces (45) are fixable on the carrying shaft (44) in a desired peripheral position using fixing devices (48).

13. A holding device according to claim 5, characterized in that the clamping device (36) comprises a compression spring (39) acting between the guide rod (43) and the clamping bar (34).

14. A holding device according to claim 13, characterized in that the compression spring (39) can be prestressed by an eccentric lever (47) supportable on the support lugs (41, 42), one of them being associated to the guide rod (43) and the other one being associated to the clamping bar (34).