Bending mechanism and bending device

Abstract

The utility model discloses a bending mechanism and a bending device. The bending mechanism comprises a first base, a first bending assembly and a second bending assembly, the first bending assembly comprises a first connecting piece and a first bending piece, the first connecting piece is movably connected to the first base, the first bending piece is elastically connected to the first connecting piece, the second bending assembly comprises a second bending piece, and the second bending piece is elastically connected to the second connecting piece. The second bending piece is arranged on the first base, and the second bending piece and the first bending piece are oppositely arranged; wherein a to-be-bent workpiece is suitable for being placed between the first bending piece and the second bending piece, the first bending piece and the second bending piece can be close to each other so as to bend the to-be-bent workpiece, the first bending piece is elastically connected to the first connecting piece, and when the first bending piece makes contact with the to-be-bent workpiece, the second bending piece is elastically connected to the second connecting piece so as to bend the to-be-bent workpiece. And therefore, a buffering effect can be achieved on the first bending piece, and the to-be-bent workpiece is prevented from being crushed.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production equipment technical field more particularly, relate to a kind of bending mechanism and bending device. BACKGROUND

[0002] In the related art, in the production process of cylindrical battery, the tab and the battery shell, the cap and the tab are sequentially welded, and the central axis of the cap after welding is perpendicular to the central axis of the battery shell, so the tab needs to be bent to facilitate the cap to be buckled into the battery shell. At present, the tab is generally bent by two oppositely arranged folding knives. After the battery is loaded, the tab is located between the two folding knives, and the folding knives are moved closer to each other to bend the tab. However, when the folding knives contact the tab and the cap, they may crush the tab or the cap due to excessive pressure.

[0003] Therefore, there is a need to provide a new technical solution to solve the above technical problems. SUMMARY

[0004] An object of the present utility model is to provide a new technical solution for a bending mechanism.

[0005] According to the first aspect of the present utility model, a bending mechanism is provided. The bending mechanism comprises:

[0006] a first base;

[0007] a first bending assembly comprising a first connecting member and a first bending member, the first connecting member being movably connected to the first base, and the first bending member being elastically connected to the first connecting member;

[0008] a second bending assembly comprising a second bending member, the second bending member being arranged on the first base, and the second bending member being oppositely arranged with the first bending member;

[0009] wherein the first bending member and the second bending member are adapted to place a workpiece to be bent therebetween, and the first bending member and the second bending member can move closer to each other to bend the workpiece to be bent.

[0010] Optionally, the first bending assembly further comprises a connecting rod, one end of the connecting rod being connected to the first bending member, the other end of the connecting rod being connected to the first connecting member, and the first bending member being slidable relative to the first connecting member.

[0011] Optionally, the first bending assembly further comprises an elastic member, the elastic member being sleeved on the connecting rod, and one end of the elastic member being connected to the first bending member, the other end of the elastic member being connected to the first connecting member.

[0012] Optionally, the first bending member is movably connected to the first base.

[0013] Optionally, the second bending member is movably connected to the first base.

[0014] Optionally, the first bending member is provided with a pushing portion, and the second bending member is provided with an abutting portion capable of abutting against one side of the workpiece to be bent, and the pushing portion is capable of pushing the other side of the workpiece to be bent, so as to bend the workpiece to be bent.

[0015] Optionally, the second bending member is further provided with a supporting portion adapted to support the side of the workpiece to be bent away from the pushing portion.

[0016] Optionally, the pushing portion is an arc-shaped curved surface structure.

[0017] Optionally, the bending mechanism further comprises a driving assembly adapted to drive the first bending member and the second bending member to move close to or away from each other.

[0018] Optionally, the driving assembly comprises a cam disc, the cam disc is provided with a first guide groove, and the first bending assembly is capable of moving along the first guide groove, so that the first bending member is capable of moving towards or away from the second bending member.

[0019] According to a second aspect of the present application, a bending device is provided. The bending device comprises the bending mechanism as described in the above embodiments.

[0020] One technical effect of the present application is that the first bending member is elastically connected to the first connecting member, the first connecting member is slidably connected to the first base, the workpiece to be bent is arranged between the first bending member and the second bending member, the first connecting member is capable of driving the first bending member to move towards the second bending member, so that the first bending member and the second bending member can cooperate with each other to bend the workpiece to be bent, and the first bending member is elastically connected to the first connecting member, so that the first bending member can play a buffering role when the first bending member contacts the workpiece to be bent, thereby avoiding crushing the workpiece to be bent.

[0021] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0023] Figure 1 is a partial structure schematic view of a bending mechanism of one embodiment of the present application.

[0024] Figure 2 is a partial structure schematic diagram of a bending mechanism of another embodiment of the present application.

[0025] Figure 3 is a partial structure schematic diagram of a bending mechanism of another embodiment of the present application.

[0026] Figure 4 is a partial structure schematic diagram of a bending mechanism of another embodiment of the present application.

[0027] Figure 5 is Figure 4 the enlarged view at A shown.

[0028] Figure 6 is a structure schematic diagram of a cam disc of one embodiment of the present application.

[0029] Figure 7 is a partial structure schematic diagram of a bending device of one embodiment of the present application.

[0030] Reference signs:

[0031] 1, first base; 11, first slide rail; 12, second slide rail; 2, first bending assembly; 21, first connecting piece; 22, first bending piece; 221, pushing part; 23, connecting rod; 24, elastic piece; 3, second bending assembly; 31, second bending piece; 311, abutting part; 312, supporting part; 32, second connecting piece; 4, cam disc; 41, first guide groove; 42, second guide groove; 5, first follower; 6, second follower; 7, battery; 71, tab; 72, cap; 8, second base; 9, cup. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in the examples, numerical expressions, and numerical values are not limiting to the scope of the present application unless otherwise specifically stated.

[0033] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application or its application or uses.

[0034] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, the techniques, methods, and devices should be considered part of the specification, if appropriate.

[0035] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0037] According to one embodiment of this application, a bending mechanism is provided. Figures 1 to 5 As shown, the bending mechanism includes a first base 1, a first bending assembly 2, and a second bending assembly 3. The first bending assembly 2 includes a first connector 21 and a first bending member 22. The first connector 21 is movably connected to the first base 1, and the first bending member 22 is elastically connected to the first connector 21. The second bending assembly 3 includes a second bending member 31, which is disposed on the first base 1 and is positioned opposite to the first bending member 22. The space between the first bending member 22 and the second bending member 31 is suitable for placing a workpiece to be bent, and the first bending member 22 and the second bending member 31 can approach each other to bend the workpiece.

[0038] In this example, the first connector 21 is slidably connected to the first base 1. The first connector 21 can drive the first bending member 22 to move toward or away from the second bending member 31. The workpiece to be bent is placed between the first bending member 22 and the second bending member 31. The first connector 21 drives the first bending member 22 to move toward the second bending member 31, thereby enabling the first bending member 22 and the second bending member 31 to cooperate with each other to bend the workpiece to be bent. Since the first bending member 22 is elastically connected to the first connector 21, when the first bending member 22 contacts the workpiece to be bent, it can buffer the first bending member 22, thereby preventing damage to the workpiece to be bent.

[0039] like Figure 2 As shown, in this example, there is a gap between the first bending member 22 and the second bending member 31, and the workpiece to be bent is placed between the first bending member 22 and the second bending member 31. Then, the first bending member 22 and the second bending member 31 can move closer to each other; for example, the first connecting member 21 can drive the first bending member 22 to move towards the second bending member 31. The second bending member 31 can abut against one side of the workpiece to be bent, and the first bending member 22 can abut against the other side of the workpiece to be bent, pushing the workpiece to be bent to bend. After the workpiece to be bent is bent, the first bending member 22 and the second bending member 31 can move away from each other to facilitate the next loading.

[0040] like Figure 1As shown in the example, the first base 1 is provided with a first sliding rail 11, and the first connecting piece 21 can be a sliding block, which is slidingly installed on the first sliding rail 11, so as to drive the first bending piece 22 to move along the first sliding rail 11, thereby driving the first bending piece 22 to move close to or away from the second bending piece 31.

[0041] As shown in the example, the workpiece to be bent can be a tab 71 of a battery 7, and a cap 72 is welded to one end of the tab 71. The tab 71 is bent by the first bending piece 22 and the second bending piece 31, so as to facilitate the subsequent buckling of the cap 72 into the shell of the battery 7. Of course, the workpiece to be bent can also be other types of parts, which can be determined by those skilled in the art according to actual conditions, and is not specifically limited here. Figure 4 Figure 5 As shown in the example, the workpiece to be bent can be a tab 71 of a battery 7, and a cap 72 is welded to one end of the tab 71. The tab 71 is bent by the first bending piece 22 and the second bending piece 31, so as to facilitate the subsequent buckling of the cap 72 into the shell of the battery 7. Of course, the workpiece to be bent can also be other types of parts, which can be determined by those skilled in the art according to actual conditions, and is not specifically limited here.

[0042] As shown in the example, the first bending assembly 2 further comprises a connecting rod 23, one end of the connecting rod 23 is connected to the first bending piece 22, the other end is connected to the first connecting piece 21, and the first bending piece 22 can slide relative to the first connecting piece 21. Figure 1 Figure 2 In the example, one end of the connecting rod 23 can be slidingly connected to the first connecting piece 21, and / or the other end of the connecting rod 23 can be slidingly connected to the first bending piece 22, so that the first bending piece 22 can slide relative to the first connecting piece 21. The direction in which the first bending piece 22 can slide relative to the first connecting piece 21 is parallel to the direction in which the first bending piece 22 moves towards the second bending piece 31. An elastic member 24 is arranged between the first connecting piece 21 and the first bending piece 22, so that the first connecting piece 21 and the first bending piece 22 can be elastically connected by the elastic member 24. For example, one end of the elastic member 24 abuts against the first bending piece 22, and the other end abuts against the first connecting piece 21.

[0043] For example, one end of the connecting rod 23 can be arranged in the first connecting piece 21, and then screwed into the first bending piece 22. The other end of the connecting rod 23 has a bolt head, which can prevent the connecting rod 23 from being separated from the first connecting piece 21. The connecting rod 23 can slide relative to the first connecting piece 21, so that the first bending piece 22 can slide relative to the first connecting piece 21.

[0044] For example, one end of the connecting rod 23 can be arranged in the first connecting piece 21, and then screwed into the first bending piece 22. The other end of the connecting rod 23 has a bolt head, which can prevent the connecting rod 23 from being separated from the first connecting piece 21. The connecting rod 23 can slide relative to the first connecting piece 21, so that the first bending piece 22 can slide relative to the first connecting piece 21.

[0045] ​​In this example, the elastic member 24 is sleeved on the connecting rod 23, and one end of the elastic member 24 is connected to the first bending piece 22, and the other end is connected to the first connecting piece 21. For example, the elastic member 24 can be a spring, the spring is sleeved on the connecting rod 23, one end of the spring abuts against the first connecting piece 21, and the other end abuts against the first bending piece 22. When the first connecting piece 21 drives the first bending piece 22 to abut against the workpiece to be bent, the elastic member 24 will be compressed, thereby being able to play a buffering role for the first bending piece 22, and when the first bending piece 22 pushes the workpiece to be bent, the elastic member 24 can also play a moving pushing force.

[0046] In one example, as shown in Figure 2 , the first bending piece 22 is movably connected to the first base 1.

[0047] As shown in Figure 2 , in this example, the first base 1 is also provided with a second sliding rail 12, and the second sliding rail 12 is arranged in parallel with the first sliding rail 11. The first bending piece 22 is slidingly connected to the second sliding rail 12, and the first bending piece 22 can move along the second sliding rail 12, thereby improving the stability of the movement of the first bending piece 22. Moreover, the second sliding rail 12 can also play a limiting role for the first bending piece 22 to avoid the first bending piece 22 from deviating, thereby enabling the first bending piece 22 to bend the workpiece to be bent more accurately.

[0048] In one example, the second bending piece 31 is movably connected to the first base 1. The second bending piece 31 can be slidingly connected to the second sliding rail 12 and can slide along the second sliding rail 12 to approach or move away from the second bending piece 31. When it is necessary to bend the workpiece to be bent, the first bending piece 22 and the second bending piece 31 can simultaneously move towards each other, thereby facilitating the improvement of bending efficiency. After the bending operation is completed, the first bending piece 22 and the second bending piece 31 can also simultaneously move away from each other, thereby being able to increase the distance between the first bending piece 22 and the second bending piece 31, thereby facilitating the feeding of the workpiece to be bent next time.

[0049] As shown in Figure 1 , in this example, the second bending assembly 3 further comprises a second connecting piece 32, the second bending piece 31 is connected to the second connecting piece 32, and the second connecting piece 32 is slidingly connected to the first sliding rail 11. The second connecting piece 32 can drive the second bending piece 31 to slide along the first sliding rail 11, thereby being able to drive the second bending piece 31 to move towards or away from the first bending piece 22.

[0050] In one example, as shown in Figure 4 and Figure 5As shown, the first bending member 22 is provided with a pushing portion 221, and the second bending member 31 is provided with an abutting portion 311, which is capable of abutting against one side of the workpiece to be bent, and the pushing portion 221 is capable of pushing the other side of the workpiece to be bent, so as to bend the workpiece to be bent.

[0051] As shown in Figure 4 and Figure 5 In this example, the first bending member 22 is provided with a pushing portion 221 on one side facing the second bending member 31, and the second bending member 31 is correspondingly provided with an abutting portion 311. The abutting portion 311 is capable of abutting against one side of the workpiece to be bent, so as to provide a bending fulcrum. The pushing portion 221 is capable of pushing the other side of the workpiece to be bent, so as to bend the workpiece to be bent towards the second bending member 31. In the vertical direction, the pushing portion 221 can be above or below the abutting portion 311, so that the first bending member 22 can press and bend the workpiece to be bent.

[0052] For example, the workpiece to be bent is the tab 71 of the battery 7, the second bending member 31 is capable of abutting against the side of the tab 71 away from the cap 72, and the first bending member 22 is capable of abutting against the cap 72 and pushing the cap 72, so as to bend the tab 71.

[0053] In one example, the pushing portion 221 of the first bending member 22 is an arc-shaped curved surface structure. That is, the part of the first bending member 22 for pushing the workpiece to be bent is an arc-shaped curved surface structure. The arc-shaped curved surface structure of the pushing portion 221 is capable of rolling on the workpiece to be bent when pushing the workpiece to be bent.

[0054] In one example, as shown in Figure 4 and Figure 5 The second bending member 31 is further provided with a supporting portion 312, which is suitable for supporting the side of the workpiece to be bent away from the pushing portion 221. After the workpiece to be bent is bent to a preset position, the supporting portion 312 can support the side of the workpiece to be bent away from the pushing portion 221, so as to avoid the angle of the workpiece to be bent by the first bending member 22 being too large, thereby improving the accuracy of bending the workpiece to be bent by the first bending member 22 and the second bending member 31.

[0055] As shown in Figure 5 In this example, the supporting portion 312 can be an inclined surface provided on the second bending member 31, and one end of the inclined surface is the abutting portion 311. The pushing portion 221 pushes the cap 72 to move towards the supporting portion 312, so as to realize the bending of the tab 71. When the tab 71 is bent to a preset angle, the end of the cap 72 away from the pushing portion 221 can be in contact with the supporting portion 312, and the supporting portion 312 can support and limit the cap 72.

[0056] In one example, the bending mechanism further comprises a driving assembly, the driving assembly is adapted to drive the first bending member 22 and the second bending member 31 to move towards or away from each other.

[0057] In one example, the first bending member 22 is slidingly arranged on the first base 1, the driving assembly is capable of driving the first bending member 22 to move towards the second bending member 31 to perform the bending operation. The driving assembly is also capable of driving the first bending member 22 to move away from the second bending member 31 to increase the gap between the first bending member 22 and the second bending member 31.

[0058] Alternatively, the second bending member 31 can also be slidingly arranged on the first base 1, the driving assembly is capable of driving the first bending member 22 and the second bending member 31 to move towards each other. The driving assembly is also capable of driving the first bending member 22 and the second bending member 31 to move away from each other.

[0059] In one example, as shown in Figure 6 and Figure 7 the driving assembly comprises a cam disc 4, the cam disc 4 is curvedly provided with a first guide groove 41, the first bending assembly 2 is capable of moving along the first guide groove 41 to drive the first bending member 22 to move towards or away from the second bending member 31.

[0060] As shown in Figure 1 in this example, the driving assembly further comprises a first follower 5, for example, the first follower 5 can be a cylindrical wheel, the first follower 5 can be rotatably connected to the first connecting member 21. The cam disc 4 is provided with the first guide groove 41, the first guide groove 41 can be curvedly arranged, the first follower 5 is embedded in the first guide groove 41 and is capable of moving along the first guide groove 41 to drive the first connecting member 21 to slide along the first sliding rail 11, thereby driving the first bending member 22 to move towards or away from the second bending member 31.

[0061] As shown in Figure 1 and Figure 6 in this example, the driving assembly further comprises a second follower 6, for example, the second follower 6 can be a cylindrical wheel, the second follower 6 can be rotatably connected to the second connecting member 32. The cam disc 4 is provided with a second guide groove 42, the guide groove can be curvedly arranged, the second follower 6 is embedded in the second guide groove 42 and is capable of moving along the second guide groove 42 to drive the second connecting member 32 to slide along the first sliding rail 11, thereby driving the second bending member 31 to move towards or away from the first bending member 22.

[0062] As shown in Figure 6As shown, both the first guide groove 41 and the second guide groove 42 are annular structures, with the second guide groove 42 located inside the first guide groove 41. Between the first guide groove 41 and the second guide groove 42, there is a feeding area with a relatively large gap and a bending area with a relatively small gap. In a clockwise direction, from the feeding area to the bending area, the gap between the first guide groove 41 and the second guide groove 42 gradually decreases; conversely, from the bending area to the feeding area, the gap between the first guide groove 41 and the second guide groove 42 gradually increases.

[0063] Among them, such as Figure 7 As shown, the cam disk 4 is located above the first base 1, which is mounted on a rotating wheel or turntable. The rotating wheel or turntable can drive the first base 1 to rotate. That is, in the feeding area, the distance between the first bending member 22 and the second bending member 31 is relatively large, which facilitates the feeding of the workpiece to be bent. The first base 1 can rotate to the bending area. Since the distance between the first guide groove 41 and the second guide groove 42 gradually decreases from the feeding area to the bending area, the first follower 5 and the second follower 6 can move closer to each other, thereby driving the first bending member 22 and the second bending member 31 to move closer to each other to bend the workpiece to be bent. Then, the first base 1 can rotate from the bending area to the feeding area. Since the distance between the first guide groove 41 and the second guide groove 42 gradually increases from the bending area to the feeding area, the first follower 5 and the second follower 6 can move away from each other, thereby driving the first bending member 22 and the second bending member 31 to move away from each other to facilitate feeding in the feeding area.

[0064] According to another embodiment of this application, a bending device is provided. This bending device includes the bending mechanism described in the above embodiment. The bending mechanism includes a first base 1, a first bending assembly 2, and a second bending assembly 3. The first bending assembly 2 includes a first connecting member 21 and a first bending member 22. The first connecting member 21 is movably connected to the first base 1, and the first bending member 22 is elastically connected to the first connecting member 21. The second bending assembly 3 includes a second bending member 31, which is disposed on the first base 1 and is disposed opposite to the first bending member 22. The first bending member 22 and the second bending member 31 are positioned between each other to place a workpiece to be bent, and the first bending member 22 and the second bending member 31 can approach each other to bend the workpiece. When bending the workpiece to be bent, the first connecting member 21 drives the first bending member 22 to move toward the second bending member 31. Since the first bending member 22 is elastically connected to the first connecting member 21, when the first bending member 22 comes into contact with the workpiece to be bent, it can buffer the first bending member 22, thereby preventing the workpiece to be bent from being crushed.

[0065] like Figure 7As shown, in this example, the bending device further comprises a second base 8, and the bending mechanism is mounted on the second base 8. The cam disc 4 is mounted on the second base 8 and above the first base 1, and the surface of the cam disc 4 towards the first base 1 is provided with a first guide groove 41 and a second guide groove 42. The first base 1 is mounted on a rotating disc, and the rotating disc can drive the first base 1 to rotate, so as to drive the first follower 5 to move along the first guide groove 41 and the second follower 6 to move along the second guide groove 42.

[0066] The first base 1 can be provided in plurality, and the plurality of first bases 1 are arranged in the circumferential direction of the rotating disc, and each of the first bases 1 is provided with the first bending assembly 2 and the second bending assembly 3, so that a plurality of workpieces to be bent can be continuously bent, so as to improve the bending efficiency. Wherein, the first bending assembly 2 and the second bending assembly 3 of each group are provided with a cup holder 9, and the cup holder 9 is mounted on the rotating disc, and the workpiece to be bent can be fixed in the cup holder 9.

[0067] The above embodiments mainly describe the differences between the embodiments, and the different optimization features between the embodiments can be combined to form a better embodiment without contradiction. In view of the brevity of the text, it will not be repeated here.

[0068] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A bending mechanism characterized by, The utility model relates to a bending mechanism, comprising: a first base (1); a first bending assembly (2) comprising a first connecting piece (21) and a first bending piece (22), the first connecting piece (21) being movably connected to the first base (1), and the first bending piece (22) being elastically connected to the first connecting piece (21); a second bending assembly (3) comprising a second bending piece (31), the second bending piece (31) being arranged on the first base (1), and the second bending piece (31) being oppositely arranged with the first bending piece (22); wherein the first bending piece (22) and the second bending piece (31) are adapted to place a workpiece to be bent therebetween, and the first bending piece (22) and the second bending piece (31) can move closer to each other to bend the workpiece to be bent.

2. The folding mechanism of claim 1, wherein The first bending assembly (2) further comprises a connecting rod (23), one end of the connecting rod (23) being connected to the first bending piece (22), and the other end of the connecting rod (23) being connected to the first connecting piece (21), and the first bending piece (22) can slide relative to the first connecting piece (21).

3. The bending mechanism according to claim 2, wherein The first bending assembly (2) further comprises an elastic piece (24), the elastic piece (24) being sleeved on the connecting rod (23), and one end of the elastic piece (24) being connected to the first bending piece (22), and the other end of the elastic piece (24) being connected to the first connecting piece (21).

4. The folding mechanism of claim 1, wherein The first bending piece (22) is movably connected to the first base (1).

5. The folding mechanism of claim 1, wherein The second bending piece (31) is movably connected to the first base (1).

6. The bending mechanism of claim 1, wherein The first bending piece (22) is provided with a pushing portion (221), the second bending piece (31) is provided with an abutting portion (311), the abutting portion (311) can abut against one side of the workpiece to be bent, and the pushing portion (221) can push the other side of the workpiece to be bent to make the workpiece to be bent.

7. The bending mechanism according to claim 6, wherein The second bending piece (31) is further provided with a supporting portion (312), the supporting portion (312) is adapted to support the side of the workpiece to be bent away from the pushing portion (221).

8. The bending mechanism of claim 6, wherein, The pushing portion (221) is an arc-shaped curved surface structure.

9. The bending mechanism of claim 1, wherein, The utility model further comprises a driving assembly, the driving assembly is adapted to drive the first bending piece (22) and the second bending piece (31) to move closer to each other or move away from each other.

10. The folding mechanism of claim 9, wherein, The driving assembly comprises a cam disc (4), the cam disc (4) is bent to be provided with a first guide groove (41), the first bending assembly (2) can move along the first guide groove (41) to make the first bending piece (22) move towards or away from the second bending piece (31).

11. A bending apparatus characterized by comprising: The utility model further comprises a bending mechanism as claimed in any one of claims 1 to 10. The utility model further comprises a bending mechanism as claimed in any one of claims 1 to 10.

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