CN114682702A - Protective blanking buffer device for automobile part production - Google Patents

Abstract

The invention discloses a protective blanking buffer device for automobile part production, which comprises a workbench, wherein a processing station is formed in the middle of the workbench, supporting legs are connected to four corners of the bottom of the workbench in the vertical direction, two supporting legs positioned on the same side of the workbench are fixedly sleeved with supporting sleeve plates, the two supporting sleeve plates are connected through two connecting shafts which are horizontally arranged, the inner side of any one supporting sleeve plate is hinged with a cylinder, two sliding plates capable of moving in the vertical direction are arranged below the workbench, a bearing plate is fixedly connected to the position, corresponding to the processing station, of the tail end of each sliding plate in the vertical direction, and a jacking plate is connected between the tops of the two bearing plates. The protective blanking buffer device for automobile part production meets the requirement of blanking of parts with large weight, can prevent the cylinder from directly bearing large load, and simultaneously prevents the cylinder from damaging the automobile parts due to inertia impact.

Description

Protective blanking buffer device for automobile part production

Technical Field

The invention relates to the technical field of mechanical blanking, in particular to a protective blanking buffering device for automobile part production.

Background

Automobile parts is when production, it places the blank in the mould usually, accomplish the processing to the blank through stamping device, the spare part after the shaping that finishes processing breaks away from out the completion unloading from the bed die under climbing mechanism's effect, climbing mechanism generally adopts is cylinder drive mode, move and then break away from the mould with the part through cylinder drive jacking board in vertical direction, but when facing the great automobile parts of weight, direct through cylinder drive jacking board then require greatly to the load of cylinder, and when cylinder load increase, its inertia mechanical impact who produces is also great, cause the damage to the spare part very easily. In view of this, the invention provides a protective blanking buffer device for automobile part production.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, one object of the present invention is to provide a protective blanking buffer device for automobile part production, which can meet the requirement of blanking of heavy parts, and can prevent the cylinder from directly bearing a large load, and prevent the cylinder from damaging the automobile parts due to inertial impact.

The invention provides a protective blanking buffer device for automobile part production, which comprises a workbench, wherein a processing station is formed in the middle of the workbench, supporting legs are connected to four corners of the bottom of the workbench in the vertical direction, two supporting legs positioned on the same side of the workbench are fixedly sleeved with supporting sleeve plates, the two supporting sleeve plates are connected through two connecting shafts which are horizontally arranged, the inner side of any one supporting sleeve plate is hinged with a cylinder, two sliding plates capable of moving in the vertical direction are arranged below the workbench, a bearing plate is fixedly connected to the position, corresponding to the processing station, of the tail end of each sliding plate in the vertical direction, and a jacking plate is connected between the tops of the two bearing plates;

the fixed fagging that has cup jointed between two the connecting axle, it has V type piece to articulate on the fagging, the one end that V type piece is close to the cylinder is connected with two guide posts, the first center pin of one end fixedly connected with that V type piece deviates from the cylinder, the piston end of cylinder with first center pin is articulated, the position department that corresponds the guide post on the sliding plate forms spacing spout along the horizontal direction, the guide post imbeds respectively to corresponding spacing spout in and be connected with it sliding fit.

Preferably, two triangle supporting seats of fixedly connected with, two of its length direction symmetry are followed at the top of fagging fixedly connected with second center pin between the triangle supporting seat, the kink of V type piece cup joint in on the second center pin and rotate with it and link to each other, the torsional spring has been cup jointed on the second center pin, the one end and the second center pin of torsional spring are fixed and link to each other, the other end and the V type piece of torsional spring are fixed and link to each other.

Preferably, the top of fagging is located fixed mounting between two triangle supporting seats and has spacing backstop piece, install the travel switch who is connected with the cylinder electricity on the terminal surface that V type piece corresponds spacing backstop piece, be provided with on the inclined plane of spacing backstop piece with the corresponding contact of travel switch works as travel switch on the V type piece with when the contact department of meeting on the spacing backstop piece, the guide post slides to the rightmost end of spacing spout, and the left side of V type piece is for spacing spout vertical distribution.

Preferably, the top of any one of the support sleeve plates is fixedly connected with two vertical plates along the vertical direction, the outer sides of the two vertical plates are provided with a T-shaped slide rail along the length direction, the inner sides of the two vertical plates are open along the length direction, one end of the sliding plate penetrates through the opening of the vertical plate and extends into the T-shaped slide rail, and then is fixedly connected with a T-shaped plate, and the T-shaped plate is connected with the T-shaped slide rail in a sliding fit manner; the two sliding plates are connected through a connecting rod.

Preferably, two all be fixed with the lining seat on the vertical board one side lateral wall towards the workstation, two rotate between the lining seat and install power device, the last piston sleeve that has cup jointed of power device, and the piston sleeve can slide along this power device's axial, fixedly connected with dead lever on the periphery of piston sleeve, the end-to-end connection of dead lever has the centre gripping manipulator that is used for centre gripping automobile parts.

Preferably, the power device adopts a rodless cylinder, a limiting rib is formed on the outer wall of the rodless cylinder along the axial direction of the rodless cylinder, and the piston sleeve is sleeved on the rodless cylinder and the limiting rib and is connected with the rodless cylinder and the limiting rib in a sliding fit mode.

Preferably, the T-shaped plate is integrally connected with a rack towards one side of the opening of the vertical plate, a gear is fixedly sleeved at the position of the rodless cylinder corresponding to the opening of the vertical plate, and the gear penetrates through the opening of the vertical plate and then is meshed with the corresponding rack.

Compared with the prior art, the invention has the beneficial effects that:

(1) the jacking plate and the air cylinder are connected through the V-shaped block, when a piston rod of the air cylinder extends, the V-shaped block is driven to rotate clockwise by taking the second central shaft as a center, meanwhile, two guide posts on the V-shaped block slide to the right side in the limiting sliding groove, and the length of the left side of the V-shaped block is larger than that of the right side of the V-shaped block, so that the guide posts can drive the sliding plate to move upwards in the clockwise rotation process of the V-shaped block, the air cylinder drives the V-shaped block to rotate, the rotation motion of the V-shaped block is converted into the linear motion of the jacking plate in the vertical direction, and the air cylinder is equivalent to a labor-saving lever in the motion process, so that the load of the air cylinder can be reduced. When the requirement of the blanking of parts with large weight is met, the cylinder can be prevented from directly bearing large load, and meanwhile, the cylinder is prevented from damaging automobile parts due to inertia impact.

(2) When the guide post on the V-shaped block slides to the rightmost end of the limiting sliding groove, and the left side of the V-shaped block is vertically distributed relative to the limiting sliding groove, the air cylinder can stop acting at the moment, the V-shaped block can achieve the self-locking effect under the action of gravity of the automobile part, and the air cylinder is prevented from being in a working state for a long time.

(3) The cylinder drive V type piece carries out clockwise rotation's in-process, and the sliding plate upwards slides and cooperatees through gear and rack and can drive the centre gripping manipulator to remove and then live its centre gripping to the part direction, and the centre gripping manipulator removes to the guide mouth direction of both sides under the effect of rodless cylinder afterwards, can be with the part unloading to the guide mouth after finishing adding, and then has realized the mechanized unloading of part, very big promotion parts machining efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of an entire apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the entire apparatus of the embodiment of the present invention with the work table removed;

FIG. 3 is a schematic view of the assembly of a vertical plate and a support sleeve plate according to an embodiment of the present invention;

FIG. 4 is a schematic view of the structure on the sliding plate in an embodiment of the present invention;

FIG. 5 is a schematic view of the assembly of the clamping robot and the vertical plate of the present invention;

FIG. 6 is another schematic view of the jacking plate of FIG. 2 taken at a cross-sectional view along the middle of the jacking plate;

fig. 7 is a schematic view of the exploded structure of the components on the spreader plate in an embodiment of the present invention.

In the figure: 1. a work table; 2. supporting legs; 3. a processing station; 4. a material guide port; 5. a support sleeve plate; 6. a connecting shaft; 7. a supporting plate; 8. a sliding plate; 9. a vertical plate; 10. clamping the manipulator; 11. fixing the rod; 12. a T-shaped plate; 13. a connecting rod; 14. a jacking plate; 15. a rack; 16. a bearing plate; 17. a limiting chute; 18. a T-shaped slide rail; 19. a lining seat; 20. a rodless cylinder; 21. a gear; 22. limiting ribs; 23. a piston sleeve; 24. a cylinder; 25. a triangular support seat; 26. a limit stop block; 27. a V-shaped block; 28. a guide post; 29. a first central shaft; 30. a travel switch; 31. a second central shaft; 32. a torsion spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The embodiment discloses but unloading buffer is used in production of protection formula automobile parts, as shown in fig. 1-7, including workstation 1, be connected with supporting leg 2 along vertical direction on four angles in the bottom of workstation 1, workstation 1's middle part is formed with machining-position 3, and machining-position 3's inside is big-end-up's echelonment, prevents that automobile parts from dropping from machining-position 3. After the automobile parts to be processed are placed inside the processing station 3, the automobile parts are processed through a stamping device or other devices in the prior art, and after the automobile parts are processed, the automobile parts are jacked to the outside of the processing station 3, so that the blanking operation of the automobile parts is completed.

As the core technical scheme of the invention, two supporting legs 2 positioned on the same side of a workbench 1 are respectively fixedly sleeved with supporting sleeve plates 5, the two supporting sleeve plates 5 are connected through two connecting shafts 6 horizontally arranged, and the inner sides of the supporting sleeve plates 5 positioned on the left side of the workbench 1 are hinged with air cylinders 24. The lower part of the workbench 1 is provided with two sliding plates 8 which can move along the vertical direction, the position of the tail end of each sliding plate 8 corresponding to the processing station 3 is fixedly connected with a bearing plate 16 along the vertical direction, a jacking plate 14 is connected between the tops of the two bearing plates 16, the jacking plate 14 is driven to move along the upward movement of the sliding plate 8 along the vertical direction, and then parts inside the processing station 3 are jacked to the outside of the processing station.

Since the device in the present application is applied to a heavy automobile component, in order to reduce the load of the air cylinder 24 and to make the automobile component more stable when being lifted, as shown in fig. 1 and 7, in the present embodiment, the supporting plate 7 is fixedly sleeved between the two connecting shafts 6, the top of the supporting plate 7 is symmetrically and fixedly connected with the two triangular supporting seats 25 along the length direction thereof, the second central shaft 31 is fixedly connected between the two triangular supporting seats 25, the bent portion of the V-shaped block 27 is sleeved on the second central shaft 31 and rotatably connected therewith, one end of the V-shaped block 27 close to the air cylinder 24 is connected with two guide posts 28, one end of the V-shaped block 27 far from the air cylinder 24 is fixedly connected with the first central shaft 29, the piston end of the air cylinder 24 is hinged with the first central shaft 29, and a position of the sliding plate 8 corresponding to the guide posts 28 forms a limit chute 17 along the horizontal direction, the guiding posts 28 are respectively embedded into the corresponding limiting sliding grooves 17 and connected with the same in a sliding fit manner. When the piston rod of the air cylinder 24 extends, the V-shaped block 27 is driven to rotate clockwise around the second central shaft 31, meanwhile, the two guide posts 28 on the V-shaped block 27 slide to the right side in the limiting sliding groove 17, because the length of the left side of the V-shaped block 27 is larger than that of the right side of the V-shaped block 27, the guide posts 28 drive the sliding plate 8 to move upwards in the clockwise rotation process of the V-shaped block 27, the air cylinder 24 drives the V-shaped block 27 to rotate, the rotation motion of the V-shaped block 27 is converted into the linear motion of the jacking plate 14 in the vertical direction, the air cylinder 24 acts on the short shaft end of the V-shaped block 27, and the air cylinder 24 acts as a labor-saving lever, so that the load of the air cylinder 24 can be reduced. In addition, in order to reduce the inertial impact force of the cylinder 24 in the action process, in this embodiment, the second central shaft 31 is further sleeved with a torsion spring 32, one end of the torsion spring 32 is fixedly connected with the second central shaft 31, the other end of the torsion spring 32 is fixedly connected with the V-shaped block 27, and the torsion spring 32 can play a role in buffering the rotation of the V-shaped block 27, so as to play a role in buffering the mechanical impact force of the cylinder 24.

Further, in this embodiment, a limit stop block 26 is fixedly installed between two triangular supporting seats 25 at the top of the supporting plate 7, a travel switch 30 electrically connected to the air cylinder 24 is installed on an end surface of the V-shaped block 27 corresponding to the limit stop block 26, and a contact corresponding to the travel switch 30 is arranged on an inclined surface of the limit stop block 26. The V-shaped block 27 rotates clockwise around the second central shaft 31, when the travel switch 30 on the V-shaped block 27 is connected with the contact point on the limit stop block 26, the guide post 28 slides to the rightmost end of the limit sliding groove 17, and the left side of the V-shaped block 27 is vertically distributed relative to the limit sliding groove 17, at this time, the air cylinder 24 stops operating, and the V-shaped block 27 is distributed along the vertical direction due to the left side, so that the V-shaped block can achieve the self-locking effect under the action of gravity of the automobile parts, and the air cylinder 24 is prevented from being in the working state for a long time.

As shown in fig. 2 and 3, two vertical plates 9 are fixedly connected to the top of the supporting sleeve plate 5 mounted with the cylinder 24 along the vertical direction, T-shaped slide rails 18 are formed on the outer sides of the two vertical plates 9 along the length direction, the inner sides of the two vertical plates 9 are open along the length direction, one end of the sliding plate 8 extends into the T-shaped slide rails 18 through the opening of the vertical plates 9 and then is fixedly connected with a T-shaped plate 12, the T-shaped plate 12 is connected with the T-shaped slide rails 18 in a sliding fit manner, when the cylinder 24 drives the V-shaped block 27 to rotate clockwise, because the T-shaped plate 12 connected with one end of the sliding plate 8 is under the limiting action of the T-shaped slide rails 18, the guide post 28 is matched with the limiting chute 17 to drive the sliding plate 8 to move linearly in the vertical direction, and in order to keep the two sliding plates 8 to operate synchronously, the two sliding plates 8 in this embodiment are connected by the connecting rod 13, the two sliding plates 8 can be connected in one piece by means of a connecting rod 13.

As shown in fig. 6, a lining seat 19 is fixed on one side wall of each of two vertical plates 9 facing the workbench 1, a power device is rotatably installed between the two lining seats 19, a piston sleeve 23 is sleeved on the power device, the piston sleeve 23 can slide along the axial direction of the power device, a fixing rod 11 is fixedly connected on the circumferential surface of the piston sleeve 23, the end of the fixing rod 11 is connected with a clamping manipulator 10 for clamping automobile parts, when the automobile parts are processed in the processing station 3, the automobile parts are lifted by a lifting plate 14 to be separated from the processing station 3, the clamping manipulator 10 acts to clamp the parts, the clamping manipulator 10 can be clamped by adopting a magnetic adsorption mode, the power device between the two lining seats 19 rotates anticlockwise to drive the clamping manipulator 10 to rotate anticlockwise for a certain angle, and then the clamping manipulator 10 slides on the power device to a target position, and blanking the part to the next production procedure.

As a preferred embodiment, the power device in this embodiment selects the rodless cylinder 20, the limiting ribs 22 are formed on the outer wall of the rodless cylinder 20 along the axial direction thereof, the piston sleeve 23 is sleeved on the rodless cylinder 20 and the limiting ribs 22 and is connected with the same in a sliding fit manner, and the freedom degree of the piston sleeve 23 can be limited by adopting the above structure, so that the piston sleeve can synchronously rotate with the rodless cylinder 20.

Further, the rodless cylinder 20 in this embodiment rotates and is driven by the movement of the sliding plate 8 in the vertical direction, specifically, the T-shaped plate 12 is integrally connected with a rack 15 towards one side of the opening of the vertical plate 9, a gear 21 is fixedly sleeved on the rodless cylinder 20 at a position corresponding to the opening of the vertical plate 9, the gear 21 penetrates through the opening of the vertical plate 9 and then is meshed with the corresponding rack 15, when the sliding plate 8 moves upwards in the vertical direction, the rack 15 is meshed with the gear 21 and further drives the gear 21 to rotate clockwise, after the lifting plate 14 completely ejects the part, the clamping manipulator 10 just rotates clockwise to the horizontal state and is attached to the top of the part, and then the rodless cylinder 20 drives the clamping manipulator 10 to slide along any side of the length direction, and further transfers the part to the upper side of the material guide port 4 on the two sides of the workbench 1.

The invention provides a protective blanking buffer device for automobile part production, which has the following detailed working principle: in the initial state, the lifting plate 14 is located below the machining station 3, the clamping manipulator 10 is located above the machining station 3 and is in an inclined state, after the parts in the machining station 3 are machined, the air cylinder 24 is started to drive the V-shaped block 27 to rotate clockwise by taking the second central shaft 31 as the center, after the travel switch 30 on the right side of the V-shaped block 27 moves to be attached to the contact on the limit stop block 26, the air cylinder 24 stops acting, at the moment, the lifting plate 14 rises to the highest position, and the parts are also ejected to the machining station 3. The guide post 28 on the V-shaped block 27 slides in the limiting sliding groove 17 to drive the sliding plate 8 to move upwards along the vertical direction, in the moving process of the sliding plate 8, the T-shaped plate 12 slides in the T-shaped sliding rail 18, the rack 15 is meshed with the gear 21 to drive the rodless cylinder 20 to rotate clockwise, the clamping manipulator 10 rotates clockwise to the horizontal state to be attached to a part, the clamping manipulator 10 acts to clamp the part, then the rodless cylinder 20 starts to drive the piston sleeve 23 to slide along the axial direction of the piston sleeve 23, after the clamping manipulator 10 slides to the upper side of the material guide opening 4, the clamping manipulator 10 releases to blank the part onto the material guide opening 4, then the piston sleeve 23 returns to the initial position, and the piston rod of the cylinder 24 retracts to enable the V-shaped block 27 to return to the initial position.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims (7)

1. The blanking buffering device for the production of the protective automobile parts comprises a workbench (1), wherein a processing station (3) is formed in the middle of the workbench (1), and supporting legs (2) are connected to four corners of the bottom of the workbench (1) in the vertical direction, and the blanking buffering device is characterized in that two supporting legs (2) positioned on the same side of the workbench (1) are fixedly sleeved with supporting sleeve plates (5), the two supporting sleeve plates (5) are connected with each other through two connecting shafts (6) horizontally arranged, wherein an air cylinder (24) is hinged to the inner side of any one of the supporting sleeve plates (5), two sliding plates (8) capable of moving in the vertical direction are arranged below the workbench (1), and a bearing plate (16) is fixedly connected to the position, corresponding to the processing station (3), of the tail end of each sliding plate (8) in the vertical direction, a jacking plate (14) is connected between the tops of the two bearing plates (16);

two fixed cover between connecting axle (6) has been connected with fagging (7), it has V type piece (27) to articulate on fagging (7), the one end that V type piece (27) are close to cylinder (24) is connected with two guide posts (28), one end fixedly connected with first center pin (29) that V type piece (27) deviate from cylinder (24), the piston end of cylinder (24) with first center pin (29) are articulated, the position department that corresponds guide post (28) on sliding plate (8) is formed with spacing spout (17) along the horizontal direction, guide post (28) imbed respectively in corresponding spacing spout (17) and are connected with it sliding fit.

2. The blanking buffering device for the production of the protective automobile parts as claimed in claim 1, wherein the top of the supporting plate (7) is symmetrically and fixedly connected with two triangular supporting seats (25) along the length direction thereof, a second central shaft (31) is fixedly connected between the two triangular supporting seats (25), the bent portion of the V-shaped block (27) is sleeved on the second central shaft (31) and rotatably connected therewith, a torsion spring (32) is sleeved on the second central shaft (31), one end of the torsion spring (32) is fixedly connected with the second central shaft (31), and the other end of the torsion spring (32) is fixedly connected with the V-shaped block (27).

3. The blanking buffering device for the production of the protectively-arranged automobile parts as claimed in claim 2, wherein a limit stop block (26) is fixedly installed between two triangular supporting seats (25) at the top of the supporting plate (7), a travel switch (30) electrically connected with the cylinder (24) is installed on the end face of the V-shaped block (27) corresponding to the limit stop block (26), a contact corresponding to the travel switch (30) is arranged on the inclined surface of the limit stop block (26), when the travel switch (30) on the V-shaped block (27) is connected with the contact on the limit stop block (26), the guide column (28) slides to the rightmost end of the limit sliding groove (17), and the left side of the V-shaped block (27) is vertically distributed relative to the limit sliding groove (17).

4. The blanking buffering device for the production of the protective automobile parts as claimed in any one of claims 1 to 3, wherein the top of any one of the supporting sleeve plates (5) is fixedly connected with two vertical plates (9) along the vertical direction, the outer sides of the two vertical plates (9) are formed with T-shaped sliding rails (18) along the length direction thereof, the inner sides of the two vertical plates (9) are open along the length direction thereof, one end of the sliding plate (8) passes through the opening of the vertical plate (9) and extends into the T-shaped sliding rails (18) and then is fixedly connected with T-shaped plates (12), and the T-shaped plates (12) are connected with the T-shaped sliding rails (18) in a sliding fit manner; the two sliding plates (8) are connected through a connecting rod (13).

5. The blanking buffering device for the production of the protective automobile parts as claimed in claim 4, wherein lining seats (19) are fixed on side walls of the two vertical plates (9) facing the workbench (1), a power device is rotatably installed between the two lining seats (19), a piston sleeve (23) is sleeved on the power device, the piston sleeve (23) can slide along the axial direction of the power device, a fixing rod (11) is fixedly connected to the circumferential surface of the piston sleeve (23), and a clamping manipulator (10) for clamping the automobile parts is connected to the tail end of the fixing rod (11).

6. The blanking buffering device for the production of the protective automobile parts as claimed in claim 5, wherein the power device is a rodless cylinder (20), the outer wall of the rodless cylinder (20) is axially provided with a limiting rib (22), and the piston sleeve (23) is sleeved on the rodless cylinder (20) and the limiting rib (22) and is connected with the rodless cylinder (20) and the limiting rib in a sliding fit manner.

7. The blanking buffering device for the production of the protective automobile parts as claimed in claim 6, wherein a rack (15) is integrally connected to one side of the T-shaped plate (12) facing the opening of the vertical plate (9), a gear (21) is fixedly sleeved on the rodless cylinder (20) at a position corresponding to the opening of the vertical plate (9), and the gear (21) is meshed with the corresponding rack (15) after passing through the opening of the vertical plate (9).

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