Device for Unwinding a Material Web from One or More Material Web Rolls

Abstract

The invention relates to a device (100) for unwinding a material web from a plurality of material web rolls (110), said device comprising: a machine frame (102); a main bearing point (105), which is located on and in particular fastened to the machine frame, for rotatably supporting a first shaft (109) for a first material web roll (110), wherein the material web roll can be unwound; a first drive shaft (121) for rotationally driving the first material web roll, wherein the first drive shaft can be placed directly or indirectly against the outer periphery of the first material web roll in order to transmit the drive force; a first pair of pivot arms, the pivot arms (122) of which are pivotably mounted in the machine frame, wherein one end of the first drive shaft is rotatably mounted in each pivot arm; a secondary bearing point which is located on the machine frame and which can take over the shaft from the main bearing point and/or is provided for supporting a second shaft for a second material web roll.

Claims

1. Device for unwinding a material web from several material web rolls with a machine frame with a main bearing point arranged and in particular fastened to the machine frame for rotatably bearing a first shaft for a first material web roll, wherein the material web roll can be unwound, with a first drive shaft for rotationally driving the first material web roll, wherein the first drive shaft can be directly or indirectly adjusted to the outer circumference of the first material web roll for transmission of the drive force, with a pair of first pivot arms, the pivot arms of which are pivotably mounted in the machine frame, one end of the first drive shaft being rotatably mounted in each pivot arm, with a secondary bearing point arranged on the machine frame, with which the shaft can be transferred from the main bearing point and/or is provided for bearing a second shaft for a second material web roll, with a second drive shaft for rotationally driving a material web roll mounted on the secondary bearing point, wherein the second drive shaft can be directly or adjusted to the outer circumference of the material web roll mounted on the secondary bearing point for transmission of the drive force, with a second pivot arm pair, the pivot arms of which are pivotably mounted in the machine frame, one end of the second drive shaft being rotatably mounted in each pivot arm, wherein the pivot arms of the first pair of pivot arms are arranged further outwards in relation to the machine frame than the pivot arms of the second pair of pivot arms when viewed from the central vertical of the first and/or second drive shaft.

2. Device according to claim 1, characterized in that the radial extension of the first pair of pivot arms is greater than the radial extension of the second pair of pivot arms.

3. Device according to claim 1, characterized in that the secondary bearing point comprises a third pair of pivot arms, the pivot arms of which are pivotably mounted in the machine frame and, viewed from the central vertical, are arranged further outwards than the pivot arms of the second pair of pivot arms and, in particular, are arranged further inwards than the pivot arms of the first pair of pivot arms.

4. Device according to claim 1, characterized in that the radial extent of the pivot arms of the third pair of pivot arms is smaller than the radial extent of the pivot arms of the first pair of pivot arms and/or is greater than or equal to the radial extent of the pivot arms of the second pair of pivot arms.

5. Device according to claim 1, characterized in that a force-providing device is provided, with which a force can be applied to the second pivot arm, whereby the force-providing device is supported/attached to the third pivot arm.

6. Device according to claim 1, characterized in that at least one pivot arm of the first and/or the second pair of pivot arms comprises a drive for rotating the drive shaft.

7. Device according to claim 1, characterized in that at least one pivot arm of the second pair of pivot arms carries a drive for rotationally driving the second drive shaft, wherein the pivot arm of the first pair of pivot arms, which is arranged on the same side as the pivot arm of the second pair of pivot arms carrying the drive when viewed from the central vertical, is arranged at a distance from the pivot arm carrying the drive which is greater than the mounting depth of the drive.

8. Device according to claim 1, characterized in that a pivot arm of the first pair of pivot arms, in particular the pivot arm of the first pair of pivot arms, which is arranged on the same side as the pivot arm of the second pair of pivot arms carrying the drive when viewed from the central vertical, carries a drive.

9. Device according to claim 1, characterized in that a rotor shaft of the drive is connected to the drive shaft in a torque-transmitting manner by means of a deflection gear.

10. Device according to claim 1, characterized in that the first pivot arm of the first and/or the second pair of pivot arms carries a drive motor for driving the first and/or the second drive shaft, wherein the second pivot arm of the first and/or the second pair of pivot arms carries a balancing device for balancing the weight of the drive motor.

11. Device according to claim 1, characterized in that the balancing device comprises a monolithic element, in particular a block comprising at least one metal.

12. Device according to claim 1, characterized in that the balancing device comprises a second drive motor, which is in particular identical to the first drive motor.

13. Device according to claim 1, characterized in that the balancing device comprises a force-providing device with which a force can be applied to the second pivot arm, the force-providing device being supported in particular on the machine frame.

Description

[0047] FIG. 1 Side view of a device according to the invention in unwinding mode

[0048] FIG. 2 Side view as in FIG. 1, but with the secondary bearing point pivoted to the main bearing point

[0049] FIG. 3 Side view as in FIG. 2, but with the web roll removed from the main bearing point by the secondary bearing point

[0050] FIG. 4 Side view as in FIG. 3, but with the first web roll deposited and the material web unwound from the second material web roll FIG. 5 Top view of a device according to the invention FIG. 6 View VI-VI from FIG. 1.

[0051] FIG. 1 shows a device 100 according to the invention for unwinding a material web 101 in unwinding mode.

[0052] The device 100 primarily comprises a machine frame 102, which comprises a large number of largely unspecified components. The machine frame 102 comprises a base frame 103 and a longitudinal member 104 extending in the direction x, which is supported on the base frame 103.

[0053] Furthermore, a main bearing point 105 is provided, which is arranged in particular on the machine frame 102. This main bearing point 105 comprises as essential elements a vertical support 106, i.e. a support extending in the direction Y, as well as a support element 107 with a receptacle 108 for a shaft 109, whereby the vertical support and the support element can be designed as one unit. The holder for the shaft is shown in FIG. 1 as a simple trough, but the structure is more complex, although this is not shown for the sake of clarity.

[0054] The shaft 109 carries a first material web reel 110, onto which the material web 101, which is being unwound, is wound. The material web 101 is drawn off via a plurality of guide elements and/or deflection rollers, of which a deflection roller 111 is shown as an example, and fed, for example, to a tube forming station.

[0055] As the material web winder 110 is generally very heavy and the material web is not sufficiently tear-resistant, the material web winder cannot be moved using the tensile force applied to the material web. It is therefore intended that a drive force acts on the material web reel 110 to drive it rotationally. In the embodiment shown, this driving force is transmitted to the circumferential surface of the reel 110. For this purpose, a first drive shaft 120 can be provided, which can be driven rotationally and, for example, rests against the circumferential surface of the reel 110. However, it is also possible that the first drive shaft carries two or more first drive disks 121 which transmit the drive force to the circumferential surface of the material web winder 110.

[0056] The driving force is provided by a first drive motor 180, which is explained in more detail below in connection with FIG. 6. The first drive shaft 120 is rotatably mounted in a first pivot arm pair, the pivot arm 122 of the first pivot arm pair being visible in FIG. 1. The pivot arm 122 is pivotably mounted in the longitudinal member 104 via a pivot bearing 123.

[0057] A first pivot drive 124 is provided for pivoting the pivot arm 122. The first end of this is supported in an articulated manner on the machine frame 10, in particular on its carrier 104, via a first spherical bearing 125. The pivot arm 122 is connected to the pivot drive 124 in an articulated manner via a second spherical bearing 126. The pivot drive itself can be designed in particular as a compressed air-operated piston-cylinder unit, which is preferably double-acting, i.e. can be actively operated in two directions. The contact pressure with which the drive shaft 120 and/or the drive pulleys 121 can be applied to the material web 110 can be adjusted in particular with such a piston-cylinder unit.

[0058] The components of the device according to the invention described so far in connection with FIG. 1 are required for the unwinding operation of a first material web reel 110. In order to now be able to replace a nearly unwound 15 material web reel 110, the material web reel 110 must first be removed from the main winding station 105. An auxiliary or secondary winding station 130 is provided for this purpose. This secondary winding station comprises a second pair of pivot arms 131 and a third pair of pivot arms 132.

[0059] Of the third pivot arm pair 132, again only one pivot arm is visible, the first end of which is pivotably mounted in the machine frame 102, in particular in its support 104, by means of a third pivot bearing 133. The second end of the pivot arm 132 is formed and arranged to receive one end of the shaft 109. For a better overview, this shaft receptacle is again only shown as a depression or trough 134. In a specific embodiment, a shaft receptacle can be provided, for example a shaft lock, whereby it is first possible to pivot the pivot arm 132 to below the shaft 109. Subsequently, the shaft 109 can be lifted off the receptacle 108 of the main bearing point by means of the shaft receptacle and secured against relative movement to the pivot lever 132 by means of a securing device.

[0060] The third pivot arm 132 is pivoted by a third pivot drive 137. This pivot drive is articulated to the machine frame 102, in particular to the carrier 104. The pivot drive 137 is also articulated to the pivot arm 132. The pivot drive is preferably designed as a spindle-spindle nut combination, so that precise positioning of the pivot arm 132 is possible, which is advantageous for the takeover of the shaft 109. For this purpose, the pivot drive comprises a motor 138 which drives a spindle 139. The spindle 139 is screwed into a spindle nut 140, which is articulated to the pivot arm 132 but cannot be rotated relative to it. Thus, the rotation of the spindle nut causes a lateral movement of the spindle nut and consequently a pivot movement of the pivot arm. The arrangements of the spindle nut 140 and the motor 138 can also be interchanged.

[0061] For driving the shaft 109 and/or the material web winder 110, a second drive shaft 135 is provided in the pivot levers of the second pair of pivot arms 131, which can be driven rotationally by a drive not shown in FIG. 1. The second drive shaft 135 can be directly adjustable to the material web winder 110 or can carry drive pulleys 136 or other elements transmitting the drive force, which transmit the drive force from the drive shaft 135 to the outer circumference of the material web winder. The drive of the material web roll via the second drive shaft 135 just described is necessary when the first drive shaft 120 or the first drive pulleys 121 are no longer in contact with the material web reel 110.

[0062] A second pivot drive 141 is provided for the pivot movement of the second pair of pivot arms, of which, as already described, only the pivot arm 131 is visible. This pivot drive 141, which in turn is preferably designed as a piston cylinder unit operated by compressed air, is connected by its first end to the second pivot arm 131 in an articulated manner and by its second end to the third pivot arm 132 in an articulated manner. This means that when the third pivot drive 137 is actuated, the pivot arm 131 and at the same time the pivot arm 132 pivots relative to the machine frame. Relative to one another, the second pivot arm 131 and the third pivot arm 132 remain unchanged as long as the pivot drive 141 is not actuated. Overall, this arrangement ensures that the pressure force of the drive shaft 135 or the drive pulleys 136 on the material web roll can be kept constant in a simple manner even when the third pivot arm 132 is pivoted for the purpose of removing the material web roll from the main bearing point 107.

[0063] After the material web roll has reached a defined change diameter, the third pivot arm 132 is pivoted into a takeover position for taking over the shaft 109 together with the material web roll 110 up to the main bearing point 107. The second pivot drive 141 is then actuated so that the drive shaft 135 or the drive pulleys 136 are moved into drive contact with the outer surface of the material web roll 110 and can drive it. Shortly before, simultaneously or afterwards, the first pivot arm 122 is swung away by means of the pivot drive 124, so that the drive contact between the material web roll 110 and the drive shaft 120 or the drive pulleys 121 is interrupted. The pivot positions resulting from this sequence are shown in FIG. 2. Since no further features are shown in comparison to FIG. 1, the features described have not been provided with reference numbers again. These result directly and clearly from FIG. 1.

[0064] FIG. 3 now shows the situation after the pivot arm 132 has been pivoted away from the main bearing point 107 after the shaft 109 and the material web roll 110 have been taken over. The material web 101 continues to run off the material web roll 110. A new shaft 149, which carries a new material web roll 150, has been deposited on the main bearing point.

[0065] FIG. 4 shows that the material web 101 is now being unwound from the new material web roll 150. Previously, a connection step took place in which the beginning of the web, which was wound onto the new material web roll 150, was connected to the material web of the material web roll 110 and the old material web was then cut between the material web roll and the connection point of both material webs.

[0066] This connection step, which preferably takes place at full production speed, is not shown.

[0067] FIG. 4 also shows that the material web roll can be or is deposited on a removal station 160. For this purpose, the removal station 160 comprises two vertical elements 161, i.e. supports extending in direction y, of which only one vertical element 160 is visible. The vertical elements are supported on the machine frame 102. Each vertical element carries a roll track which is preferably inclined slightly with respect to the x-direction, wherein the end of the roll track 162 which faces the third pivot arm is raised with respect to the end of the roll track facing away from the third pivot arm. At this end facing away, each roll track comprises a stop element 163, with which the rolling movement of the shaft 109 can be stopped, so that the shaft then lies still and can be safely removed from the device 100.

[0068] To deposit the material web roll 110, the third pair of pivot arms 132 is pivoted further away from the main bearing point 107 until the journals of the shaft 109 rest on the roll tracks 162. The shaft 109 is then released from the shaft holder of the third pair of pivot arms 132, so that the shaft 109 is freely movable and can roll along the roll track.

[0069] When the shaft 109 is released with the rest of the material web roll 110, the state as shown in FIG. 1 is restored.

[0070] FIG. 5 shows a plan view of the device 100 in the operating state of FIG. 1. Starting from the axial center of the shaft 109, the radial direction spans a center plane 170, which is also the center plane in relation to at least one of the other shafts, in particular the drive shafts 120 and 135. A vertical line, which lies on this center plane and runs orthogonally to the axis of rotation of one of these drive shafts, is understood to be a central vertical.

[0071] Starting from the central plane 170 and looking to the right or left, i.e. in or against the direction z, the individual components have the arrangement according to the invention. In this view, it can be seen that the essential features of a device according to the invention are present twice and are generally arranged mirror-symmetrically to the central plane 170.

[0072] The pivot arms 131 of the second pair of pivot arms are arranged at the smallest distance from the center plane 170. The pivot arms 132 of the third pair of pivot arms are provided further outwards. It may be provided that the pivot arms 131 are located within the area bounded by the longitudinal members 104 and the pivot arms 132 are located outside the area bounded by the longitudinal members 104. A common axis 171 can be provided for both pivot arms, which runs through the respective longitudinal member 104 and on which the pivot arms 132 and 131 are pivotably supported via bearings and thus form the pivot bearings, of which the pivot bearing 133 is shown in FIG. 1.

[0073] The pivot arms 122 of the first pair of pivot arms are located even further outwards compared to the pair of pivot arms 132. These are preferably arranged further away from the central plane or central vertical than the pivot drives 137 of the pivot arms of the third pair of pivot arms 132.

[0074] Starting from the central vertical or the central plane 170, the components of the removal station 160 are arranged between the pivot arms 131 of the second pair of pivot arms and the pivot arms 122 of the first pair of pivot arms. The individual elements of the removal station 160 are provided with the reference numbers known from FIG. 1, but are not explained again here.

[0075] It is preferable to arrange the removal station 160 between the pivot arms 132 of the third pair of pivot arms and the pivot arms 122 of the first pair of pivot arms.

[0076] FIG. 6 now shows the view VI-VI from FIG. 5, i.e. a side view of a device according to the invention. The individual elements in this figure have the same reference numbers as in the previous figures.

[0077] This view again clearly shows the distance between the pivot arms of the individual pairs of pivot arms compared to the center plane 170.

[0078] Furthermore, it can be seen that in the vertical direction, i.e. seen in the direction y, the pivot arms 122 of the first pair of pivot arms have a greater extension than the pivot arms 132 of the third pair of pivot arms. In addition, seen in the direction y, they have a greater extension than the pivot arms 131 of the second pair of pivot arms.

[0079] Furthermore, it is advantageous if the pivot arms 132 of the third pair of pivot arms have a greater extension in the vertical direction, i.e. in the y direction, than the pivot arms 131 of the second pair of pivot arms.

[0080] In addition, compared to the previous figures, a drive motor 180 can be seen in FIG. 6, with which the drive shaft 120 can be set into a rotational movement. Thus, the drive motor drives the material web reel 110 via the drive shaft 120 and the drive pulleys 121, provided that the drive pulleys 121 are in frictional contact with the material web reel 110. The drive force of the motor 180 is preferably transmitted to the drive shaft 120 via a motor shaft 181 and an angular gear 182. The drive motor 180 and the angular gear 182 are arranged on one of the pivot arms 122 of the first pair of pivot arms. In order to prevent a different movement of the two pivot arms 122 under the influence of gravity due to the weight of the drive components arranged on this pivot arm 30 when the pivot arms are pivoted, the pivot arm 122, which does not carry the drive motor, is provided with a counterweight 183. In particular, this balancing weight has the same mass weight as the drive components mentioned above, which essentially comprise the drive motor, the motor shaft and the deflection gear. However, the counterbalance weight may also comprise the same drive components, in which case the drive shaft 120 would have its two ends driven. Instead of a counterbalance weight, it may also be provided that the pivot drives 124 act on the pivot arms 122 with different pivot forces, so that in this way the gravitational force acting differently on the pivot arms can be compensated.

[0081] The drive shaft 135 can be driven in the same way as the drive shaft 120. The drive motor 190, the motor shaft 191 and the deflection gear 192, which are arranged on one of the pivot arms 131 of the second pair of pivot arms, are available for this purpose. Their design, mode of operation, advantages and modifications correspond to those previously described in connection with the drive elements 180, 181 and 182. The same applies to the counterweight 193.

[0082] However, it can be seen that the size of the drive components 190, 191, 192 and the size of the counterweight are such that they are smaller than the free space between the respective adjacent pivot arms 131 and 132. In other words, the free space between these pivot arms is such that they are larger than the maximum space required by the largest of the drive components 180, 181, 182 when viewed in the z direction.

TABLE-US-00001 List of reference numbers 100 Device for unwinding a material web 101 Material web 102 Machine frame 103 Base frame 104 Longitudinal member 105 Main bearing point 106 Vertical support 107 Support element 108 Mounting for a shaft 109 Shaft 110 Material web winding 111 Deflection roller 120 Drive shaft 121 Drive pulley 122 Pivot arm 123 Pivot bearing 124 Pivot drive 125 First spherical bearing 126 Second spherical bearing 130 Auxiliary or secondary winding point 131 Second pair of pivot arms 132 Third pair of pivot arms 133 Third pivot bearing 134 Recess/trough 135 Second drive shaft 136 Drive pulley 137 Third pivot drive 138 Motor 139 Spindle 140 Spindle nut 141 Second pivot drive 149 New wave 150 New material web roll 160 Removal station 161 Vertical elements 163 Stop element 170 Center plane 171 Common axis 180 Drive motor 181 Motor shaft 182 Angular gear 183 Counterweight 190 Drive motor 191 Motor shaft 192 Deflection gear 193 Counterweight