Bottle grabbing fixture and cartoning machine

Abstract

The present invention discloses a bottle grabbing clamp and a case packing machine. The bottle grabbing clamp includes a plurality of clamping assemblies, a fixed plate, and at least one twisting assembly. The clamping assemblies and the twisting assembly are both mounted on the fixed plate. The twisting assembly is connected to the clamping assembly, and the twisting assembly can drive the clamping assembly to rotate. The twisting assembly of the bottle grabbing clamp of the present invention can drive the clamping assembly to rotate. After the clamping assembly of the bottle grabbing clamp grasps an oval bottle, the oval bottle can rotate with the rotation of the clamping assembly, thereby adjusting the posture of the oval bottle entering the interior of the packaging box, so that the oval bottles are arranged in an oblique manner inside the packaging box, thereby improving the space utilization efficiency inside the packaging box, reducing the volume requirement of the packaging box, reducing the manufacturing cost of the packaging box, and facilitating transportation.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging equipment, in particular to a bottle grabbing clamp and a case packing machine. Background Art

[0002] Existing cartoning machines primarily handle round bottles, arranging them in neat rows and columns within cartons. With the development of the daily chemical industry, oval bottles have gradually emerged. While conventionally arranged horizontally or vertically within cartons can still be packed and transported, the resulting packaging is relatively bulky, resulting in low space utilization and increased packaging costs. To reduce packaging costs and improve space utilization, oval bottles are arranged at an angle within the carton, reducing the volume of the box. Summary of the Invention

[0003] The object of the present invention is to provide a bottle grabbing clamp and a case packing machine, which can arrange oval bottles at a certain angle in a packaging box, thereby improving the space utilization rate in the packaging box and reducing the cost of the packaging box.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] On the one hand, a bottle grabbing clamp is provided, comprising a plurality of clamping assemblies, a fixed plate and at least one twisting assembly, wherein the clamping assemblies and the twisting assembly are both arranged on the fixed plate, the twisting assembly is connected to the clamping assembly, and the twisting assembly can drive the clamping assembly to rotate.

[0006] As a preferred solution of the present invention, the torsion assembly includes a first driving mechanism, a rack, a plurality of gears, a plurality of bearings and a plurality of rotating shafts. The first driving mechanism, the rack and the gear are arranged on one side of the fixed plate, and the clamping assembly is arranged on the other side of the fixed plate. The first driving mechanism can drive the rack to reciprocate, the gear is engaged with the rack, the rotating shaft passes through the gear, the bearing is sleeved on the rotating shaft, a plurality of first through holes are opened on the fixed plate, the bearing is fixed in the first through holes, and the rotating shaft is connected to the clamping assembly.

[0007] As a preferred solution of the present invention, the clamping assembly includes a base, a second driving mechanism and a clamping mechanism. The base is connected to the rotating shaft. The second driving mechanism and the clamping mechanism are both arranged on the base. The second driving mechanism can drive the clamping mechanism to open and close.

[0008] As a preferred solution of the present invention, the base includes a first connecting plate, a second connecting plate and several connecting columns, the first connecting plate and the second connecting plate are arranged opposite to each other, the first connecting plate is connected to the rotating shaft, one end of the connecting column is connected to the first connecting plate, and the other end of the connecting column is connected to the second connecting plate, the second driving mechanism is arranged between the first connecting plate and the second connecting plate, a second through hole is opened on the second connecting plate, and the second driving mechanism passes through the second through hole and is connected to the clamping mechanism.

[0009] As a preferred solution of the present invention, the clamping mechanism includes a first clamping jaw, a second clamping jaw and two oppositely arranged mounting plates, the mounting plates are connected to the second connecting plate, the mounting plates are arranged on the side of the second connecting plate away from the first connecting plate, the first clamping jaw and the second clamping jaw are respectively hinged to one of the mounting plates, the first clamping jaw and the second clamping jaw are both connected to the second driving mechanism, and the second driving mechanism can drive the first clamping jaw and the second clamping jaw to rotate.

[0010] As a preferred solution of the present invention, an eccentric limiting column is provided on the mounting plate, and the eccentric limiting column selectively abuts against the second driving mechanism.

[0011] As a preferred solution of the present invention, the torsion assembly also includes a first limiting mechanism, the first limiting mechanism includes a first limiting plate and a first limiting pin, the first limiting plate is fixed to the fixed plate, the first limiting pin is fixed to the rack, a first limiting hole is opened on the first limiting plate, and the first limiting pin is arranged in the first limiting hole.

[0012] As a preferred solution of the present invention, the clamping assembly also includes a third driving mechanism, the fixed plate includes a first fixed plate and a second fixed plate, the first fixed plate and the second fixed plate are both connected to the third driving mechanism, and the first fixed plate and the second fixed plate are respectively provided with a set of the torsion assembly and a plurality of clamping assemblies, and the third driving mechanism can drive the first fixed plate and the second fixed plate to move closer to and away from each other.

[0013] As a preferred solution of the present invention, the bottle grabbing clamp also includes a guide assembly, which includes a plurality of guide rails, a plurality of first sliders, a plurality of second sliders and a second limiting mechanism, the first slider is arranged on the first fixed plate, the second slider is arranged on the second fixed plate, each of the guide rails is provided with at least one first slider and at least one second slider, the second limiting mechanism includes a second limiting plate and a second limiting pin, one end of the second limiting plate is fixed to the guide rail, and the other end of the second limiting plate is fixedly connected to the first fixed plate or the second fixed plate, the second limiting pin is protruded on the end face of the first fixed plate or the second fixed plate, the second limiting plate is provided with a second limiting hole, and the second limiting pin is arranged in the second limiting hole.

[0014] On the other hand, a cartoning machine is also provided, comprising the bottle grabbing clamp described in any of the above technical solutions.

[0015] Beneficial effects of the present invention:

[0016] The torsion assembly of the bottle grabbing clamp of the present invention can drive the clamping assembly to rotate. After the clamping assembly of the bottle grabbing clamp grabs the oval bottle, the oval bottle can rotate with the rotation of the clamping assembly, thereby adjusting the posture of the oval bottle entering the interior of the packaging box, so that the oval bottles are arranged in an inclined manner inside the packaging box, thereby improving the space utilization efficiency inside the packaging box, reducing the volume requirement of the packaging box, reducing the manufacturing cost of the packaging box, and facilitating transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of conventional packing of oval bottles;

[0018] Figure 2 Schematic diagram of tilted packing for oval bottles;

[0019] Figure 3 This is a three-dimensional schematic diagram of a bottle gripping clamp according to an embodiment of the present invention;

[0020] Figure 4 for Figure 3 Schematic side view of

[0021] Figure 5 for Figure 3 Schematic top view of

[0022] Figure 6 for Figure 4 Enlarged view of point A in the middle;

[0023] Figure 7 for Figure 5 BB cross-sectional view;

[0024] Figure 8for Figure 5 CC sectional view;

[0025] Figure 9 for Figure 7 Enlarged view of point D in the middle;

[0026] Figure 10 for Figure 8 An enlarged schematic diagram of the clamping assembly and the torsion assembly;

[0027] Figure 11 for Figure 3 Front view diagram of .

[0028] In the picture:

[0029] 1. Clamping assembly; 11. Base; 111. First connecting plate; 112. Second connecting plate; 1121. Second through hole; 113. Connecting column; 12. Second driving mechanism; 121. Second cylinder; 122. Connecting sleeve; 123. Push block; 124. Second bolt; 13. Clamping mechanism; 131. First clamping jaw; 132. Second clamping jaw; 133. Mounting plate; 134. Eccentric limiting column; 14. Third driving mechanism;

[0030] 2. Fixing plate; 21. First fixing plate; 22. Second fixing plate; 3. Torsion assembly; 31. First driving mechanism; 311. First cylinder; 312. Connector; 32. Rack; 33. Gear; 34. Bearing; 35. Rotating shaft; 36. First bolt; 37. First limiting mechanism; 371. First limiting pin; 372. First limiting plate; 3721. First limiting hole;

[0031] 4. Guide assembly; 41. First slider; 42. Second slider; 43. Guide rail; 44. Second limiting mechanism; 441. Second limiting plate; 4411. Second limiting hole; 442. Second limiting pin; 5. Suspension assembly; 51. First suspension plate; 52. Second suspension plate;

[0032] 100, bottle body; 200, box body. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below" a second feature may include the first feature being directly below or diagonally below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0036] like Figure 1 and Figure 2 As shown, for the oval bottle body 100, placing it in the box body 200 in an inclined manner will save more space than the conventional placement method, and also reduce the manufacturing cost of the box body 200. In order to achieve the inclined placement of the bottle body 100, as shown in FIG. Figure 3 As shown, a bottle gripping clamp of one embodiment includes a plurality of clamping components 1, a fixed plate 2 and a twisting component 3. The clamping components 1 and the twisting components 3 are both arranged on the fixed plate 2. The twisting component 3 is connected to the clamping component 1, and the twisting component 3 can drive the clamping component 1 to rotate.

[0037] The twisting assembly 3 of the bottle gripper of this embodiment drives the gripping assembly 1 to rotate. Once the gripping assembly 1 of the bottle gripper grasps a bottle 100, the bottle 100 rotates with the gripping assembly 1, thereby adjusting the orientation of the bottle 100 as it enters the box 200. This allows the bottles 100 to be arranged in an oblique arrangement within the box 200, improving space utilization within the box 200, reducing the required volume of the box 200, lowering the manufacturing cost of the box 200, and facilitating transportation. By varying the number of gripping assemblies 1, the number of bottles 100 gripped at a time can be varied to meet actual operational needs.

[0038] Considering that the bottles 100 in the box 200 are arranged in more than one row or column, the bottle grabbing clamp of this embodiment preferably includes two sets of twisting components 3, each twisting component 3 controls a plurality of clamping components 1, so that the bottle grabbing clamp can simultaneously place two rows of bottles 100 into the box 200, making the packing operation more efficient.

[0039] like Figures 4 to 9As shown, the torsion assembly 3 specifically includes a first drive mechanism 31, a rack 32, a plurality of gears 33, a plurality of bearings 34, and a plurality of rotating shafts 35. The first drive mechanism 31, the rack 32, and the gear 33 are arranged on one side of the fixed plate 2, and the clamping assembly 1 is arranged on the other side of the fixed plate 2. This fully utilizes the space on both sides of the fixed plate 2, prevents interference between components, and facilitates loading, unloading, and maintenance. The first drive mechanism 31 can drive the rack 32 to reciprocate. The gear 33 meshes with the rack 32. The rotating shaft 35 passes through the gear 33. The bearings 34 are sleeved on the rotating shaft 35. The fixed plate 2 is provided with a plurality of first through holes. The bearings 34 are fixed in the first through holes (not shown in the figure). The rotating shaft 35 is connected to the clamping assembly 1. The length of the rack 32 can be adjusted according to the number and size of the gears 33, so that all gears 33 meshing with the rack 32 move synchronously, thereby ensuring that all clamping assemblies 1 connected to the torsion assembly 3 can rotate synchronously and ensure the uniform posture of the bottle body 100.

[0040] In this embodiment, the first drive mechanism 31 includes a first cylinder 311 and a connector 312. The connector 312 is fixedly connected to the rack 32. The cylinder shaft of the first cylinder 311 is connected to the connector 312, and the cylinder shaft of the first cylinder 311 causes the rack 32 to reciprocate. The first drive mechanism 31 is not limited to a cylinder-powered mode and may also be electrically driven or hydraulically powered.

[0041] like Figure 4 and Figure 8 As shown, the clamping assembly 1 includes a base 11, a second driving mechanism 12 and a clamping mechanism 13. The base 11 is connected to the rotating shaft 35. The second driving mechanism 12 and the clamping mechanism 13 are both arranged on the base 11. The second driving mechanism 12 can drive the clamping mechanism 13 to open and close, so that the clamping assembly 1 can grasp and release the bottle body 100.

[0042] Specifically, the base 11 includes a first connecting plate 111, a second connecting plate 112, and a plurality of connecting posts 113. The first connecting plate 111 and the second connecting plate 112 are arranged opposite each other. The first connecting plate 111 is connected to the rotating shaft 35. One end of the connecting post 113 is connected to the first connecting plate 111, and the other end of the connecting post 113 is connected to the second connecting plate 112. The second drive mechanism 12 is arranged between the first connecting plate 111 and the second connecting plate 112. The second connecting plate 112 is provided with a second through hole 1121. The second drive mechanism 12 passes through the second through hole 1121 and is connected to the clamping mechanism 13. There is a large space between the first connecting plate 111 and the second connecting plate 112. On the one hand, it is convenient to install the second drive mechanism 12. On the other hand, it also makes the structure of the clamping assembly 1 more compact, and on the other hand, it also makes adjacent clamping assemblies 1 without structural interference when rotating.

[0043] like Figure 7 and Figure 9 As shown, the first connecting plate 111 is connected to the rotating shaft 35 via a first bolt 36 . When the rotating shaft 35 rotates, the first connecting plate 111 also rotates, thereby causing the clamping assembly 1 to rotate as a whole, thereby adjusting the posture of the bottle body 100 .

[0044] Specifically, the clamping mechanism 13 includes a first clamping jaw 131, a second clamping jaw 132 and two oppositely arranged mounting plates 133, the mounting plates 133 are connected to the second connecting plate 112, and the mounting plates 133 are arranged on the side of the second connecting plate 112 away from the first connecting plate 111. The first clamping jaw 131 and the second clamping jaw 132 are respectively hinged to one mounting plate 133, and the first clamping jaw 131 and the second clamping jaw 132 are both connected to the second driving mechanism 12, and the second driving mechanism 12 can drive the first clamping jaw 131 and the second clamping jaw 132 to rotate. Further, as Figure 10 As shown, the second driving mechanism 12 includes a second cylinder 121, a connecting sleeve 122, a push block 123 and a second bolt 124. The push block 123 is provided with a groove for inserting one end of the first clamping jaw 131 and the second clamping jaw 132. The push block 123 is fixed to the connecting sleeve 122 by the second bolt 124. The connecting sleeve 122 is connected to the cylinder shaft of the second cylinder 121. When the cylinder shaft of the second cylinder 121 is pressed downward, the push block 123 moves downward and applies a rotational torque to the first clamping jaw 131 and the second clamping jaw 132, so that the first clamping jaw 131 and the second clamping jaw 132 are opened. Conversely, when the push block 123 moves upward, the first clamping jaw 131 and the second clamping jaw 132 are closed.

[0045] like Figure 10 As shown, an eccentric limiting post 134 is provided on the mounting plate 133, which selectively abuts the second drive mechanism 12. The eccentric limiting post 134 can rotate, thereby changing the distance between the eccentric limiting post 134 and the second connecting plate 112. When the push block 123 abuts the eccentric limiting post 134, the push block 123 cannot move further, thereby controlling the opening angle of the clamping mechanism 13. The closer the eccentric limiting post 134 is to the second connecting plate 112, the smaller the angle at which the clamping mechanism 13 can open.

[0046] like Figure 6As shown, preferably, the torsion assembly 3 further includes a first limiting mechanism 37, which includes a first limiting pin 371 and a first limiting plate 372. The first limiting plate 372 is fixed to the fixing plate 2, and the first limiting pin 371 is fixed to the rack 32. The first limiting plate 372 is provided with a first limiting hole 3721, and the first limiting pin 371 is disposed within the first limiting hole 3721. The first limiting hole 3721 is preferably an oblong hole, and the first limiting pin 371 can only move a limited distance within the first limiting hole 3721, thereby limiting the rack 32 to a limited distance. By adjusting the length of the first limiting hole 3721, the specific rotation angle of the clamping assembly 1 can be adjusted, thereby achieving more precise control of the posture of the bottle body 100.

[0047] like Figure 11 As shown, preferably, the clamping assembly 1 further includes a third driving mechanism 14, the fixed plate 2 includes a first fixed plate 21 and a second fixed plate 22, the first fixed plate 21 and the second fixed plate 22 are both connected to the third driving mechanism 14, and a set of torsion components 3 and a plurality of clamping components 1 are respectively provided on the first fixed plate 21 and the second fixed plate 22. The third driving mechanism 14 can drive the first fixed plate 21 and the second fixed plate 22 to move closer to or away from each other. Figure 1 and Figure 2 It can be seen that when the bottle 100 is Figure 1 The state rotates to Figure 2 When the bottle bodies 100 are in the rotated state, the distance between the centers of the upper and lower rows of bottles 100 will decrease. If the distance between the two rows of bottles 100 is not adjusted, there will be gaps between the two rows of bottles 100, and the bottles 100 will not be tightly arranged. Therefore, after rotating the bottles 100, the bottle gripper needs to close the distance between the two rows of bottles 100, bringing the two rows of bottles 100 closer together and reducing the space occupied by the bottles 100. This can be achieved by configuring the fixed plate 2 as a split structure and using the third drive mechanism 14 to control the distance between the first fixed plate 21 and the second fixed plate 22.

[0048] The third driving mechanism 14 can be in the form of a cylinder. The cylinder shaft of the third driving mechanism 14 is connected to the first fixed plate 21 or the second fixed plate 22. When the cylinder shaft is extended or retracted, the distance between the first fixed plate 21 and the second fixed plate 22 changes.

[0049] like Figure 3 、 Figure 6 and Figure 11As shown, further, the bottle grabbing clamp also includes a guide assembly 4, the guide assembly 4 includes a plurality of first sliders 41, a plurality of second sliders 42, a plurality of guide rails 43 and a second limiting mechanism 44, the first slider 41 is arranged on the first fixed plate 21, the second slider 42 is arranged on the second fixed plate 22, each guide rail 43 is provided with at least one first slider 41 and at least one second slider 42, the second limiting mechanism 44 includes a second limiting plate 441 and a second limiting pin 442, one end of the second limiting plate 441 is fixed on the guide rail 43, the other end of the second limiting plate 441 is fixedly connected to the second fixed plate 22, the second limiting pin 442 is protruded on the end surface of the first fixed plate 21, the second limiting plate 441 is provided with a second limiting hole 4411, and the second limiting pin 442 is arranged in the second limiting hole 4411. The guide assembly 4 is mainly used to achieve smooth movement of the first fixed plate 21 and the second fixed plate 22. The second limit plate 441 also bears the weight of the fixed plate 2 and the clamping assembly 1 to prevent the first slider 41 and the second slider 42 from falling off the guide rail 43.

[0050] like Figure 3 and Figure 11 As shown, the bottle gripper further includes a suspension assembly 5, which includes a first suspension plate 51 and a second suspension plate 52. The first suspension plate 51 and the second suspension plate 52 are both connected to the top of the guide rail 43. The first suspension plate 51 and the second suspension plate 52 are each provided with a hook, allowing the entire bottle gripper to be hung on other equipment. When the bottle gripper is placing the bottle 100 into the box 200, the bottle 100 may be blocked by the box 200 due to positional deviation, preventing the bottle 100 from smoothly entering the box 200. In this case, if the bottle gripper continues to forcibly fall, it may cause damage to the equipment. Hanging the bottle gripper on other equipment and using a pressure sensor to monitor the pressure applied by the bottle gripper to the other equipment can indicate whether the bottle gripper is in an abnormal state. When the bottle 100 is blocked from entering the box 200, the bottle gripper is subjected to not only the vertical downward force of gravity but also an upward force, causing the pressure value detected by the pressure sensor to decrease, thereby generating an alarm and shutting down the equipment, thus providing a protective effect.

[0051] An embodiment of the present invention further provides a case packing machine comprising the bottle gripping fixture of any of the above embodiments, thereby efficiently completing the case packing of oval bottles 100 .

[0052] The above embodiments are merely illustrative of the detailed embodiments of the present invention. The present invention is not limited to the detailed embodiments described above, nor does it necessarily rely on the detailed embodiments to be implemented. Those skilled in the art will appreciate that any improvements to the present invention, equivalent replacements of raw materials for the products of the present invention, addition of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A bottle gripping clamp, characterized in that: The invention comprises a plurality of clamping assemblies, a fixing plate and at least one torsion assembly, wherein the clamping assemblies and the torsion assembly are both arranged on the fixing plate, the torsion assembly is connected to the clamping assemblies, and the torsion assembly can drive the clamping assemblies to rotate; The torsion assembly includes a first driving mechanism, a rack, a plurality of gears, a plurality of bearings and a plurality of rotating shafts. The first driving mechanism, the rack and the gear are arranged on one side of the fixed plate, and the clamping assembly is arranged on the other side of the fixed plate. The first driving mechanism can drive the rack to reciprocate, the gear is engaged with the rack, the rotating shaft passes through the gear, the bearing is sleeved on the rotating shaft, the fixed plate is provided with a plurality of first through holes, the bearings are fixed in the first through holes, and the rotating shaft is connected to the clamping assembly; The clamping assembly further includes a third driving mechanism, the fixed plate includes a first fixed plate and a second fixed plate, the first fixed plate and the second fixed plate are both connected to the third driving mechanism, the first fixed plate and the second fixed plate are respectively provided with a set of the torsion assembly and a plurality of clamping assemblies, and the third driving mechanism can drive the first fixed plate and the second fixed plate to move towards and away from each other; The bottle grabbing clamp also includes a guide assembly, which includes a plurality of guide rails, a plurality of first sliders, a plurality of second sliders and a second limiting mechanism. The first slider is arranged on the first fixed plate, and the second slider is arranged on the second fixed plate. Each of the guide rails is provided with at least one first slider and at least one second slider. The second limiting mechanism includes a second limiting plate and a second limiting pin. One end of the second limiting plate is fixed to the guide rail, and the other end of the second limiting plate is fixedly connected to the first fixed plate or the second fixed plate. The second limiting pin is protruded on the end surface of the first fixed plate or the second fixed plate. A second limiting hole is opened on the second limiting plate, and the second limiting pin is arranged in the second limiting hole.

2. The bottle gripping fixture according to claim 1, characterized in that: The clamping assembly includes a base, a second driving mechanism and a clamping mechanism. The base is connected to the rotating shaft. The second driving mechanism and the clamping mechanism are both arranged on the base. The second driving mechanism can drive the clamping mechanism to open and close.

3. The bottle gripping fixture according to claim 2, characterized in that: The base includes a first connecting plate, a second connecting plate and several connecting columns. The first connecting plate and the second connecting plate are arranged opposite to each other. The first connecting plate is connected to the rotating shaft. One end of the connecting column is connected to the first connecting plate, and the other end of the connecting column is connected to the second connecting plate. The second driving mechanism is arranged between the first connecting plate and the second connecting plate. A second through hole is opened on the second connecting plate. The second driving mechanism passes through the second through hole and is connected to the clamping mechanism.

4. The bottle gripping fixture according to claim 3, characterized in that: The clamping mechanism includes a first clamping jaw, a second clamping jaw and two oppositely arranged mounting plates, the mounting plates are connected to the second connecting plate, the mounting plates are arranged on the side of the second connecting plate away from the first connecting plate, the first clamping jaw and the second clamping jaw are respectively hinged to one of the mounting plates, the first clamping jaw and the second clamping jaw are both connected to the second driving mechanism, and the second driving mechanism can drive the first clamping jaw and the second clamping jaw to rotate.

5. The bottle gripping fixture according to claim 4, characterized in that: An eccentric limiting column is provided on the mounting plate, and the eccentric limiting column selectively abuts against the second driving mechanism.

6. The bottle gripping clamp according to any one of claims 1 to 5, characterized in that: The torsion assembly also includes a first limiting mechanism, which includes a first limiting plate and a first limiting pin. The first limiting plate is fixed to the fixed plate, and the first limiting pin is fixed to the rack. A first limiting hole is opened on the first limiting plate, and the first limiting pin is arranged in the first limiting hole.

7. A cartoning machine, characterized in that: The bottle gripping clamp comprises the bottle gripping clamp according to any one of claims 1 to 6.

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