Package conveying device capable of eliminating impact fracture

Abstract

The utility model relates to the technical field of reaction cup packaging piece boxing, in particular to a packaging piece conveying device capable of eliminating impact fracture, which comprises a bracket, a storage box is arranged on the bracket, two groups of vertical plates are symmetrically and fixedly arranged on the storage box, and hoppers are fixedly arranged on the two groups of vertical plates. A bearing piece is arranged between the two vertical plates in a sliding mode, and a material bearing box is placed on the bearing piece. The device further comprises a driving assembly, the driving assembly is arranged in the storage box and comprises a reciprocating piece arranged in the length direction of the bracket, the bearing piece is in sliding connection with the reciprocating piece, and when the driving assembly acts to drive the reciprocating piece to reciprocate in the length direction of the bracket, the reciprocating piece is driven to move back and forth in the length direction of the bracket. The bearing piece is matched with an embedded groove formed in the vertical plate and can drive the material bearing box to horizontally and downwards move in a reciprocating mode, and therefore the packaging pieces discharged by the hopper are borne in a stacked mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to reaction cup packaging piece boxing technical field, specifically a kind of packaging piece conveying device for eliminating impact breakage. BACKGROUND

[0002] Immunochemiluminescence biochemical reaction cup plays a vital role in experimental application, and the production process of reaction cup mainly includes raw material preparation, mold making, injection molding, surface treatment, quality detection and packaging delivery.

[0003] At present, the reaction cup of injection molding is packaged into bag by packaging printing equipment, and the reaction cup packaging piece after bagging is conveyed into the hopper under the cooperation of finished product conveying device, and finally is dropped into the receiving box placed below the hopper. In the actual operation process, the bottom of the receiving box has a certain distance from the lower end of the hopper. During the dropping process of the packaging piece, the impact between the falling packaging piece and the receiving box caused by the height of the distance can cause the packaging piece to be damaged, so that the reaction cups in the packaging piece are scattered, and when impacted, the reaction cups can be broken, thereby causing the final quality of the product to decrease. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of packaging piece conveying device for eliminating impact breakage to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of packaging piece conveying device for eliminating impact breakage, comprising: bracket, the bracket is provided with storage box, two groups of vertical plates are symmetrically fixed on the storage box, hopper is fixed on the two groups of vertical plates, and supporting piece is slidably arranged between the two groups of vertical plates, and receiving box is placed on the supporting piece;

[0007] Further comprising driving assembly, the driving assembly is arranged in the storage box, including reciprocating member arranged along the length direction of the bracket, the supporting piece is slidably connected with the reciprocating member, when the driving assembly drives reciprocating member to reciprocate along the length direction of the bracket, the supporting piece cooperates with the embedded groove body opened in the vertical plate, can drive the receiving box to reciprocate horizontally and descend, so as to stack the packaging piece dropped by the hopper.

[0008] As described above, the packaging piece conveying device for eliminating impact breakage: the supporting piece includes supporting plate, the supporting plate is provided with pulley, two groups of pulleys are arranged along the width direction of the bracket, two groups of pulleys are slidably arranged in the embedded groove body, and buffer air bag is arranged on the side of the supporting plate away from the storage box.

[0009] The packaging piece conveying device for eliminating impact breakage as described above: the embedded groove body comprises horizontal grooves, inclined grooves, a box feeding groove, a lower box groove, a reset groove, and a feeding groove, a plurality of groups of the horizontal grooves are equidistantly arranged along the vertical direction of the vertical plate, the inclined grooves are connected between adjacent two groups of the horizontal grooves, the lowermost horizontal groove is connected with the box feeding groove through the inclined groove, the box feeding groove is connected with the reset groove through the lower box groove, and the reset groove is connected with the uppermost horizontal groove through the feeding groove at the end away from the lower box groove.

[0010] The packaging piece conveying device for eliminating impact breakage as described above: the reciprocating member comprises a reciprocating plate, the reciprocating plate is arranged in the storage box, and two groups of fixed plates are symmetrically arranged along the length direction of one side of the reciprocating plate, the sliding rods are fixedly arranged on the side of the two groups of fixed plates away from the reciprocating plate, and the supporting plate is slidably connected with the sliding rods.

[0011] The packaging piece conveying device for eliminating impact breakage as described above: the driving assembly further comprises a stroke adjusting structure and a linkage structure, the stroke adjusting structure comprises a first adjusting member, a second adjusting member, and an adapting member, the first adjusting member comprises a first air cylinder fixedly arranged in the storage box, a first sliding block is fixedly arranged at the telescopic end of the first air cylinder, the first sliding block is slidably arranged in the storage box, and a first moving wheel is rotatably installed on the first sliding block.

[0012] The packaging piece conveying device for eliminating impact breakage as described above: the second adjusting member comprises a second air cylinder fixedly arranged in the storage box, a second sliding block is fixedly arranged at the telescopic end of the second air cylinder, and a second moving wheel is rotatably installed on the second sliding block.

[0013] The packaging piece conveying device for eliminating impact breakage as described above: the adapting member comprises a guide rod fixedly arranged in the storage box, a moving member is slidably arranged on the guide rod, a driven wheel is rotatably installed on the moving member, the driven wheel, the first moving wheel, and the second moving wheel are connected through a belt, a protruding column is fixedly arranged on the side of the belt away from the guide rod, and the protruding column is slidably arranged in a sliding groove arranged on the reciprocating plate.

[0014] The packaging piece conveying device for eliminating impact breakage as described above: the linkage structure comprises a second connecting plate rotatably connected with the driven wheel, a linkage rod is rotatably installed at the end of the second connecting plate away from the driven wheel, a first connecting plate is rotatably installed on the linkage rod, the end of the first connecting plate away from the linkage rod is connected with a driving rod rotatably installed in the storage box, and the linkage rod is connected with the driven wheel and the driving rod through a second linkage belt and a first linkage belt, respectively.

[0015] Compared with the prior art, the utility model has the advantages of

[0016] Through setting drive assembly, the stroke of reciprocating piece is adjusted by stroke adjusting structure, so that when reciprocating piece cooperates with supporting plate, supporting plate can smoothly perform the work of loading, borrowing and unloading material box, and with the cooperation between fitting groove body and supporting piece, packaging piece can be stacked and placed in material box in a stacked manner.

[0017] In particular, in the above process, the bottom of the material box is attached to the lower end of the hopper in the initial state, so that the impact between the packaging piece and the material box can be reduced during the process of lowering the packaging piece into the material box through the hopper, and the buffer air bag arranged on the supporting plate can simultaneously buffer the impact generated when the packaging piece is lowered, thereby eliminating the impact generated when the packaging piece is loaded, to ensure the integrity of the reaction cup in the packaging piece during loading, thereby reducing the phenomenon of breakage of the reaction cup due to impact, and improving the production quality of the product. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Structure diagram of the packaging piece conveying device for eliminating impact and breakage.

[0019] Figure 2 Structure diagram of the storage box in the packaging piece conveying device for eliminating impact and breakage.

[0020] Figure 3 Structure diagram of the other side of the storage box in the packaging piece conveying device for eliminating impact and breakage.

[0021] Figure 4 Structure diagram of the fitting groove body in the packaging piece conveying device for eliminating impact and breakage.

[0022] Figure 5 Structure diagram of the inside of the storage box in the packaging piece conveying device for eliminating impact and breakage.

[0023] Figure 6 Structure diagram of the drive assembly in the packaging piece conveying device for eliminating impact and breakage.

[0024] Figure 7 Structure diagram of the drive assembly in the packaging piece conveying device for eliminating impact and breakage.

[0025] Figure 8 Structure diagram of the reciprocating piece and the supporting piece in the packaging piece conveying device for eliminating impact and breakage.

[0026] Figure 9 Structure diagram of the reciprocating piece in the packaging piece conveying device for eliminating impact and breakage.

[0027] In the figure: 1, bracket; 101, storage box; 2, feeding mechanism; 3, discharging mechanism; 4, hopper; 5, material receiving box; 6, vertical plate; 601, feeding groove; 602, horizontal groove; 603, inclined chute; 604, box feeding groove; 605, lower box groove; 606, reset groove; 7, placing rack; 8, supporting plate; 801, pulley; 802, air bag; 9, deflector plate; 10, spring piece; 11, reciprocating plate; 1101, sliding groove; 12, drive rod; 13, first cylinder; 14, second cylinder; 15, belt; 1501, protruding column; 16, second moving wheel; 1601, second sliding block; 17, first moving wheel; 1701, first sliding block; 18, driven wheel; 1801, moving piece; 19, guide rod; 20, spring; 21, linkage rod; 22, first connecting plate; 23, first linkage belt; 24, second connecting plate; 25, second linkage belt; 26, fixed plate; 2601, sliding rod. DETAILED DESCRIPTION

[0028] Various exemplary embodiments, features, and aspects of the present application will be described herein below with reference to the accompanying drawings. The same reference numbers in different drawings represent the same or similar elements or components. Although various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0029] The term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0030] In addition, for the purpose of convenience and brevity, detailed descriptions of well-known functions and structures incorporated in the application are omitted. It will be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the application. In some instances, well-known methods, structures, and techniques have not been described in detail in order to avoid obscuring the application.

[0031] Referring to Figures 1-9 In an embodiment of the present application, a packaging piece conveying device capable of eliminating impact breakage comprises:

[0032] The bracket 1 is provided with a storage box 101, two groups of vertical plates 6 are symmetrically and fixedly arranged on the storage box 101, a hopper 4 is fixedly arranged on the two groups of vertical plates 6, and a supporting piece is slidably arranged between the two groups of vertical plates 6, and a material receiving box 5 is placed on the supporting piece;

[0033] Preferably, referring to Figure 1 , Figure 2The hopper 4 is connected with a finished product conveying device (not shown in the figure) which can convey the reaction cup package towards the hopper 4. Specifically, the hopper 4 is arranged in an inclined state, and the package entering the hopper 4 will enter the receiving box 5 along the hopper 4.

[0034] It is particularly necessary to note that the lower end of the hopper 4 is inserted into the receiving box 5 and is close to the bottom of the receiving box 5. Therefore, during the process of lowering the package into the receiving box 5 through the hopper 4, the impact between the package and the receiving box 5 can be reduced, so as to reduce the phenomenon of breakage of the reaction cup due to impact.

[0035] Specifically, please refer to Figure 8 , Figure 9 , the supporting piece includes a supporting plate 8, the supporting plate 8 is provided with a pulley 801, the pulley 801 is arranged in two groups along the width direction of the bracket 1, the two groups of pulleys 801 are slidingly arranged in the embedded groove body, and the side of the supporting plate 8 away from the storage box 101 is provided with a buffer air bag 802;

[0036] Preferably, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 8 , Figure 9 , the bracket 1 is provided with a feeding mechanism 2 and a discharging mechanism 3, the feeding mechanism 2 and the discharging mechanism 3 are communicatively connected and are respectively used for conveying the supporting plate 8 and supporting the supporting plate 8 to receive the receiving box 5. In particular, the buffer air bag 802 arranged on the supporting plate 8 can simultaneously buffer the impact generated when the package is lowered, thereby eliminating the impact between the package and the receiving box 5, so as to ensure the integrity of the reaction cup in the package during the boxing process.

[0037] The embedded groove body includes horizontal grooves 602, inclined grooves 603, box conveying grooves 604, lower box grooves 605, reset grooves 606 and feeding grooves 601. The horizontal grooves 602 are equidistantly arranged along the vertical direction of the vertical plate 6. Adjacent two groups of the horizontal grooves 602 are connected through the inclined grooves 603. The lowermost horizontal groove 602 is connected with the box conveying groove 604 through the inclined groove 603. The box conveying groove 604 and the reset groove 606 are connected through the lower box groove 605. The end of the reset groove 606 away from the lower box groove 605 is connected with the uppermost horizontal groove 602 through the feeding groove 601.

[0038] Preferably, please refer to Figure 4 , a deflection piece is arranged between the reset groove 606 and the feeding groove 601. The deflection piece includes a deflection plate 9 rotatably installed on the vertical plate 6, and the deflection plate 9 and the vertical plate 6 are connected through a spring sheet 10.

[0039] The four groups of horizontal grooves 602 are equidistantly arranged, and the distance between the two adjacent groups of horizontal grooves 602 is the same as the thickness of the packaging piece. In the initial state, the deflection plate 9 is kept horizontal under the action of the elastic sheet 10 and the upper end horizontal groove 602 is close to the upper feeding groove 601. When the supporting plate 8 follows the reciprocating plate 11 to move reciprocally, the pulley 801 will first move along the horizontal groove 602 towards the direction away from the upper feeding groove 601. During this process, the continuously moving supporting plate 8 will drive the material receiving box 5 to slide relative to the hopper 4. Combined with the lowering of the packaging piece by the hopper 4, when the supporting plate 8 slides along the horizontal groove 602, the packaging piece will be laid flat in the material receiving box 5. Until the reciprocating member moves to the end of the stroke and starts to move in the direction, the pulley 801 will slide along the inclined groove 603. During this process, the extrusion between the pulley 801 and the groove wall of the inclined groove 603 will force the supporting plate 8 to drive the material receiving box 5 to descend, so that the subsequent lowered packaging piece can be stacked in the next layer in the material receiving box 5. After repeating this process three times, the pulley 801 moves to the combination with the box conveying groove 604. At this time, the moving reciprocating member can drive the supporting plate 8 to slide along the box conveying groove 604. Until the pulley 801 slides along the lower box groove 605, the supporting plate 8 can lap the material receiving box 5 to the lower feeding mechanism 3. Finally, the material receiving box 5 on the supporting plate 8 is removed by the lower feeding mechanism 3.

[0040] When the pulley 801 slides along the reset groove 606, the supporting plate 8 will gradually move towards the lower feeding mechanism 3. During the movement, the pulley 801 will contact the deflection plate 9, and then force the deflection plate 9 to deflect. When the pulley 801 moves to the combination with the upper feeding groove 601, the deflection plate 9 is driven by the elastic sheet 10 to return to the initial position. Then, the reverse moving reciprocating member drives the pulley 801 to slide along the upper feeding groove 601. During this process, the supporting plate 8 can receive the material receiving box 5 placed on the supporting rack 7 by the upper feeding mechanism 2. Until the supporting plate 8 returns to the initial position, the supporting plate 8 will drive the material receiving box 5 to repeat the above process and perform the next packaging piece packaging operation.

[0041] Further, a packaging piece conveying device for eliminating impact breakage further comprises a driving assembly arranged in the material box 101, which includes a reciprocating member arranged along the length direction of the bracket 1, and the supporting member is slidably connected with the reciprocating member. When the driving assembly drives the reciprocating member to move reciprocally along the length direction of the bracket 1, the supporting member cooperates with the embedded groove arranged on the vertical plate 6 to drive the material receiving box 5 to move reciprocally horizontally and downwardly, so as to stack the packaging pieces lowered by the hopper 4.

[0042] The reciprocating member comprises a reciprocating plate 11 arranged in the storage box 101, and two groups of fixed plates 26 are symmetrically arranged on the side of the reciprocating plate 11 facing the supporting plate 8 along the length direction of the reciprocating plate 11, and the sliding rods 2601 are fixedly arranged on the side of the two groups of fixed plates 26 away from the reciprocating plate 11, and the supporting plate 8 is in sliding connection with the sliding rods 2601;

[0043] The driving assembly further comprises a stroke adjusting structure and a linkage structure, the stroke adjusting structure comprises a first adjusting member, a second adjusting member and an adapting member, the first adjusting member comprises a first air cylinder 13 fixedly arranged in the storage box 101, and a first sliding block 1701 is fixedly arranged at the telescopic end of the first air cylinder 13, the first sliding block 1701 is slidingly arranged in the storage box 101, and a first moving wheel 17 is rotatably installed on the first sliding block 1701;

[0044] The second adjusting member comprises a second air cylinder 14 fixedly arranged in the storage box 101, and a second sliding block 1601 is fixedly arranged at the telescopic end of the second air cylinder 14, and a second moving wheel 16 is rotatably installed on the second sliding block 1601;

[0045] The adapting member comprises a guide rod 19 fixedly arranged in the storage box 101, a moving piece 1801 is slidingly arranged on the guide rod 19, a driven wheel 18 is rotatably installed on the moving piece 1801, the driven wheel 18, the first moving wheel 17 and the second moving wheel 16 are connected through a belt 15, and a protruding column 1501 is fixedly arranged on the side of the belt 15 away from the guide rod 19, and the protruding column 1501 is slidingly arranged in a sliding groove 1101 formed in the reciprocating plate 11;

[0046] Preferably, please refer to Figure 6 、 Figure 7 The guide rod 19 is further provided with a spring 20 slidingly arranged thereon, one end of the spring 20 abuts against the end of the guide rod 19, and the other end abuts against the moving piece 1801, in the initial state, the spring 20 is in a compressed state, which can force the moving piece 1801 to move away from the first air cylinder 13, and the belt 15 is in a taut state;

[0047] In detail, in the initial state, the telescopic end of the first cylinder 13 protrudes, and the telescopic end of the second cylinder 14 retracts. At this time, the movement stroke of the reciprocating plate 11 corresponds to the distance between the uppermost end horizontal groove 602 close to the end of the inclined groove 603 and the connection between the feeding groove 601 and the reset groove 606 in the horizontal direction. When the pulley 801 moves to be combined with the inclined groove 603, the supporting plate 8 will slide relative to the slide rod 2601, and the position sensor (not shown in the figure) arranged on the vertical plate 6 will drive the second cylinder 14 to move the second moving wheel 16 towards the first cylinder 13, and then the stroke distance of the reciprocating plate 11 is changed to be the same as the length of the horizontal groove 602, so that the material receiving box 5 performs the boxing operation of the packaging pieces;

[0048] When the pulley 801 moves to be combined with the feeding groove 604, the position sensor will drive the first cylinder 13 to pull the first moving wheel 17 away from the second cylinder 14, so that the reciprocating plate 11 can drive the supporting plate 8 to move to the stroke end of the connection between the feeding groove 604 and the lower groove 605. Then, when the pulley 801 slides along the lower groove 605 to be combined with the reset groove 606, the position sensor will drive the second cylinder 14 to return to the initial position, so that the reciprocating plate 11 can drive the supporting plate 8 to move along the reset groove 606 to be combined with the feeding groove 601.

[0049] Subsequently, when the pulley 801 moves to be combined with the uppermost end horizontal groove 602, the position sensor will drive the first cylinder 13 to return to the initial position, and then the above process is compensated, so that the continuous boxing operation of the packaging pieces can be completed.

[0050] The linkage structure comprises a second connecting plate 24 rotationally connected with the driven wheel 18, one end of the second connecting plate 24 away from the driven wheel 18 is rotationally installed with a linkage rod 21, the linkage rod 21 is rotationally installed with a first connecting plate 22, one end of the first connecting plate 22 away from the linkage rod 21 is connected with a driving rod 12 rotationally installed in the storage box 101, and the linkage rod 21 is connected with the driven wheel 18 and the driving rod 12 through a second linkage belt 25 and a first linkage belt 23 respectively.

[0051] In detail, the driving rod 12 is coaxially fixed with the output shaft of the motor fixedly installed on the bracket 1. Under the cooperation of the linkage structure, the adaptive piece can cooperate with the first moving wheel 17 and the second moving wheel 16 at any position, drive the belt 15 to continuously rotate in the same direction, and thus complete the boxing operation of the packaging pieces.

[0052] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0053] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A package conveying device that eliminates impact breakage, characterized in that: Include: The bracket (1) is provided with a storage box (101), two groups of vertical plates (6) are symmetrically arranged on the storage box (101), hopper (4) is fixedly arranged on the two groups of vertical plates (6), and supporting piece is slidably arranged between the two groups of vertical plates (6), the supporting piece is placed with material receiving box (5); It also includes a drive assembly arranged in the storage box (101), which includes a reciprocating member arranged along the length direction of the bracket (1), the supporting piece is slidably connected with the reciprocating member, when the drive assembly drives the reciprocating member to reciprocate along the length direction of the bracket (1), the supporting piece cooperates with the embedded groove on the vertical plate (6), which can drive the material receiving box (5) to reciprocate horizontally and downward, so as to stack the packaging pieces dropped by the hopper (4).

2. A package conveyor as defined in claim 1, wherein The supporting piece includes a supporting plate (8), the supporting plate (8) is provided with a pulley (801), the pulley (801) is arranged along the width direction of the bracket (1), two groups of pulleys (801) are slidably arranged in the embedded groove, and the supporting plate (8) is provided with a buffer air bag (802) away from the storage box (101).

3. A package conveyor as defined in claim 2, wherein, The embedded groove includes horizontal slot (602), inclined slot (603), box feeding slot (604), box lowering slot (605), reset slot (606) and feeding slot (601), a plurality of groups of horizontal slots (602) are equidistantly arranged along the vertical direction of the vertical plate (6), adjacent two groups of horizontal slots (602) are connected through the inclined slot (603), and the lowermost horizontal slot (602) is connected with the box feeding slot (604) through the inclined slot (603), the box feeding slot (604) and the reset slot (606) are connected through the box lowering slot (605), and the reset slot (606) is connected with the uppermost horizontal slot (602) through the feeding slot (601) away from the box lowering slot (605).

4. A package conveyor as defined in claim 2, wherein The reciprocating member includes a reciprocating plate (11), the reciprocating plate (11) is arranged in the storage box (101), and two groups of fixed plates (26) are symmetrically arranged on one side of the reciprocating plate (11) along the length direction.

5. A package conveying apparatus for eliminating impact breakage according to claim 4, wherein The drive assembly further includes stroke adjusting structure and linkage structure, the stroke adjusting structure includes first adjusting member, second adjusting member and adapting member, the first adjusting member includes first cylinder (13) fixedly arranged in the storage box (101), the telescopic end of the first cylinder (13) is fixedly provided with first sliding block (1701), the first sliding block (1701) is slidably arranged in the storage box (101), and the first sliding block (1701) is rotatably installed with first moving wheel (17).

6. A package conveying apparatus for eliminating impact breakage according to claim 5, wherein The second adjusting member comprises a second air cylinder (14) fixedly arranged in the storage box (101), and a second sliding block (1601) is fixedly arranged at the telescopic end of the second air cylinder (14), and a second moving wheel (16) is rotatably arranged on the second sliding block (1601).

7. A package conveyor as defined in claim 6, wherein The adapting member comprises a guide rod (19) fixedly arranged in the storage box (101), a moving piece (1801) is slidably arranged on the guide rod (19), a driven wheel (18) is rotatably arranged on the moving piece (1801), the driven wheel (18), the first moving wheel (17) and the second moving wheel (16) are connected through a belt (15), and a protruding column (1501) is fixedly arranged on the side, away from the guide rod (19), of the belt (15) and is slidably arranged in a sliding groove (1101) formed in the reciprocating plate (11).

8. A package conveying apparatus for eliminating impact breakage according to claim 7, wherein The linkage structure comprises a second connecting plate (24) rotatably connected with the driven wheel (18), a linkage rod (21) is rotatably arranged at the end, away from the driven wheel (18), of the second connecting plate (24), a first connecting plate (22) is rotatably arranged on the linkage rod (21), the end, away from the linkage rod (21), of the first connecting plate (22) is connected with a driving rod (12) rotatably arranged in the storage box (101), and the linkage rod (21) is connected with the driven wheel (18) and the driving rod (12) through a second linkage belt (25) and a first linkage belt (23) respectively.

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