CN219289385U - Rotary switching mechanism for cleaning barrel - Google Patents

Abstract

The utility model discloses a rotary switching mechanism for a cleaning barrel, and relates to the technical field of cleaning tools; the utility model relates to a rotary switching mechanism which comprises a rotary piece, a cam and a driving piece, wherein the bottom of the rotary piece is connected with the cam; the driving piece is provided with a groove, and the cam is arranged in the groove; one side of the driving piece is a connecting end, and the other end of the driving piece is a driving end; the groove surface of the groove close to one side of the driving end is a driving surface, the driving surface is contacted with the cam, and the distance from the driving surface to the rotating axle center of the cam can be changed through the rotation of the cam so as to realize the movement of the driving piece; the switching mechanism is simple and reliable in structure.

Description

Rotary switching mechanism for cleaning barrel

Technical Field

The utility model relates to the technical field of cleaning tools, in particular to a rotary switching mechanism for a cleaning barrel.

Background

With the development of technologies in the field of cleaning tools, a cleaning bucket having a mop cleaning function is largely put into each household, and in order to meet the use needs of users, many cleaning buckets have been developed which can clean and spin-dry a mop. In the prior art, in order to realize the functions of cleaning and spin-drying of the cleaning barrel, a cleaning area is often arranged in the cleaning barrel, a spin-drying area is further arranged, and a mop is placed in the spin-drying area for spin-drying after being cleaned in the cleaning area, so that the product size is large, and a user places the mop back and forth, so that the use process is very inconvenient.

Therefore, there is a need for a cleaning tool with reliable structure, which is convenient for users to switch the states of the cleaning and spin-drying mop, wherein the specific switching structure of the cleaning tool is important, the specific switching structure cannot be too complex, and the higher reliability is required to be satisfied, so that the optimization and improvement of the specific switching structure are needed.

Disclosure of Invention

The utility model aims to solve the technical problem that the switching structure effect of switching the cleaning and spin-drying functions of a cleaning barrel is poor in the prior art, and provides a rotary switching mechanism for the cleaning barrel, wherein the switching effect is improved by improving a specific switching mechanism.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

the utility model relates to a rotary switching mechanism which comprises a rotary piece, a cam and a driving piece, wherein the bottom of the rotary piece is connected with the cam, and the rotary piece is used for driving the cam to rotate; the driving piece is provided with a groove, and the cam is arranged in the groove; one side of the driving piece is a connecting end, and the other end of the driving piece is a driving end; the groove surface of the groove close to one side of the driving end is a driving surface, the driving surface is contacted with the cam, and the distance from the driving surface to the rotating axle center of the cam can be changed through the rotation of the cam so as to realize the movement of the driving piece; the switching mechanism is simple and reliable in structure.

Preferably, the rotating member is a rotating rod.

Preferably, the end of the rotating rod, which is far away from the cam is provided with a knob.

Preferably, the knob is provided with a rotation mark.

Preferably, at the drive end of the driver, opposite the side where the drive face is provided, a return spring is provided.

Preferably, at the drive end of the drive member, opposite the side where the drive face is provided, a spring mount is provided on which the return spring is mounted.

Preferably, the spring mounting piece is a rod-shaped mounting piece, and the reset spring is sleeved on the rod-shaped mounting piece.

Preferably, one end of the reset spring, which is far away from the driving piece, is a fixed end, and a fixing piece is arranged on the fixed end and used for fixing the position of the fixed end.

Preferably, the rotation axis of the cam intersects with the axis of the return spring.

Preferably, a limiting surface is arranged in the groove of the driving piece on the other side of the cam relative to the driving surface, and the limiting surface is used for limiting the rotation angle of the cam.

Drawings

FIG. 1 is a cross-sectional view of a cleaning bucket of the present utility model;

FIG. 2 is a schematic view of a structure in which a communicating pipe in a cleaning barrel is a telescopic pipe;

FIG. 3 is a schematic view of a structure in which a communicating pipe in a cleaning barrel is a hose;

FIG. 4 is a schematic view of a structure in which a water outlet end of a cleaning barrel of the present utility model includes a vent and a water port;

FIG. 5 is an enlarged view of the structure of the switching mechanism in the perspective view of the cleaning barrel of the present utility model;

FIG. 6 is a bottom view of a mop of the cleaning implement of the present utility model;

FIG. 7 is an enlarged view of the switching mechanism in a top view of the cleaning bucket of the present utility model;

FIG. 8 is a schematic view of a cleaning bucket of the present utility model with a water filling cover plate removed;

FIG. 9 is a schematic view of a cleaning bucket according to the present utility model with a water cover;

FIG. 10 is a schematic view of a switching mechanism in a cleaning bucket according to the present utility model;

FIG. 11 is a side view of a mop of the cleaning implement of the present utility model;

fig. 12 is an exploded view of a mop of the cleaning implement of the present utility model.

Reference numerals in the schematic drawings illustrate:

100. a cleaning barrel; 101. a water purification area; 102. a sewage area; 103. purifying water surface; 111. a mounting groove; 112. a water purifying side wall; 121. a support; 130. a cover plate; 131. a water injection side plate; 140. a water injection cover plate; 141. a water filling port;

200. a water pump; 201. a water inlet end; 202. a water outlet end; 203. a water jet; 204. a first rotary drive member;

300. a communicating pipe; 301. a vent; 302. a water-through port; 320. a support part; 330. a cleaning cloth; 340. a second rotary driving member;

400. a switching mechanism; 410. a rotating member; 411. a cam; 412. a knob; 420. a return spring; 421. a spring mount; 422. a fixing member; 430. a tube driving member; 431. a limiting surface; 432. a driving end; 433. a driving surface; 440. a pipe connection port; 441. a seal ring; 442. a guide member;

510. a mop rod; 511. rotating the mop rod; 512. a driving rod; 520. a driving wheel; 530. and (3) a driven wheel.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.

The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and therefore should not be construed as limiting the utility model, but rather as limiting the scope of the utility model, so that any structural modifications, proportional changes, or dimensional adjustments should fall within the scope of the utility model without affecting the efficacy or achievement thereof. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and the like are also used in the present specification for convenience of description, and are not intended to limit the scope of the present utility model, but the changes or modifications of the relative relationship thereof are also regarded as the scope of the present utility model which can be implemented without substantial modification to the technical content; in addition, the embodiments of the present utility model are not independent of each other, but may be combined.

A cleaning implement comprising a mop and a cleaning bucket 100; the mop is arranged corresponding to the water spraying port 203 of the cleaning barrel 100, a water pump 200 is arranged in the cleaning barrel 100, the water pump 200 comprises a water inlet end 201 and a water outlet end 202, and the water outlet end 202 is connected with the water spraying port 203 of the cleaning barrel 100; in the use process, when the mop needs to be cleaned, the cleaning barrel 100 is filled with water, the water in the cleaning barrel 100 is sucked by the water inlet end 201 under the action of the water pump 200, then discharged through the water outlet end 202, and then sprayed onto the cleaning cloth 330 of the mop by the water spraying port 203, so that the cleaning of the cleaning cloth 330 is realized.

As shown in fig. 6 and 11, the mop includes a mop rod and a cleaning cloth 330; the mop rod comprises a rotary mop rod 511 and a driving rod, and the rotary mop rod 511 is sleeved with the driving rod; the driving rod moves along the axis direction of the driving rod to drive the rotating rod to rotate; in the use, the user pushes down the actuating lever, and the actuating lever drives rotatory mop pole 511 and rotates, actuating lever and rotatory mop pole 511's structure can refer to but is not limited to the technical scheme who records in the patent of publication number CN201431427Y, and the link and the cleaning cloth 330 of rotatory mop pole 511 bottom link to each other, and the actuating lever drives rotatory mop pole 511 to rotate to drive cleaning cloth 330 rotation, cleaning cloth 330 rotation in-process water spray can realize better cleaning performance, in addition, when the mop is washd the back and is required to spin-dry, rotatory cleaning cloth 330 can realize spin-drying, and spin-drying in-process then need water spray 203 stop water spray.

In the prior art, in order to realize the functions of cleaning and spin-drying of the cleaning barrel, a cleaning area is often arranged in the cleaning barrel, a spin-drying area is further arranged, and a mop is placed in the spin-drying area for spin-drying after being cleaned in the cleaning area, so that the product size is large, and a user places the mop back and forth, so that the use process is very inconvenient.

The cleaning tool that this patent provided does not need the mop to remove the position, can realize the switch of water jet 203 play water and the non-play water state of clean bucket 100, and then realizes the switch to mop washing and spin-drying state. The water inlet end 201 is provided with a connecting hole which is a vent 301 in the air. When the connecting hole is a water through hole 302 in water, the water inlet end 201 is used for feeding water in the working process of the water pump 200, and the water pump 200 can spray the water from the water spray hole 203 to clean the mop; when the connecting hole is in the air, the water inlet end 201 of the water pump 200 can only be filled with air, and the water pump 200 can not be operated to spray water from the water spraying port 203 through the water pump 200, so that the mop can not be cleaned, and the mop can only be spin-dried when being rotated.

The connection hole of the water inlet end 201 is connected with air or water, and the following more specific schemes are provided:

the water inlet end 201 is provided with a communicating pipe 300, a pipe orifice of one end of the communicating pipe 300, which is far away from the water inlet end 201, is a connecting hole, the pipe orifice is a vent 301 in the air, and the connecting hole is a water through hole 302 in the water.

As shown in fig. 1, the hose refers to a bendable pipe, the pipe opening of the hose far away from the water inlet end 201 is a connecting hole, and when the pipe opening is located outside the clean water surface 103 in the cleaning bucket 100, the pipe opening is a vent 301; when the pipe orifice is positioned in the clean water surface 103 in the cleaning barrel 100, the pipe orifice is a water through opening 302; namely, in the use process, as shown in fig. 3, the hose is bent to enable the pipe orifice to be positioned below the clean water surface 103 in the cleaning barrel 100, at this time, in the working process of the water pump 200, the water inlet end 201 is used for feeding water, and the water pump 200 can spray the water from the water spray port 203 to clean the mop; or the mouth of the hose is positioned above the clean water surface 103 in the cleaning barrel 100, namely in the air, at the moment, the water inlet end 201 of the water pump 200 can only be filled with air, the water pump 200 can not be operated, the water can not be sprayed out from the water spraying port 203 through the water pump 200, and then the mop can not be cleaned, and the mop can only be spin-dried when rotating.

Or if the communicating pipe 300 is a telescopic pipe, the telescopic pipe refers to a pipe with variable length, such as a corrugated pipe, the pipe orifice of the telescopic pipe far away from the water inlet end 201 is a connecting hole, and when the pipe orifice is positioned outside the clean water surface 103 in the cleaning barrel 100, the pipe orifice is a vent 301; when the pipe orifice is positioned in the clean water surface 103 in the cleaning barrel 100, the pipe orifice is a water through opening 302. As shown in fig. 2, when the telescopic pipe is manually shortened, the pipe orifice of the telescopic pipe is positioned below the clean water surface 103 in the cleaning barrel 100, so that the water inlet end 201 of the water pump 200 can be filled with water, and the water pump 200 can spray the water out of the water spray port 203 to clean the mop; when the mop is not required to be cleaned, the telescopic pipe is manually stretched, so that the pipe orifice of the telescopic pipe is positioned above the clean water surface 103 in the cleaning barrel 100, and the water inlet of the water inlet end 201 of the water pump 200 can be cut off.

Alternatively, as shown in fig. 4, 2 connection holes may be provided on the water inlet 201, where the 2 connection holes are a vent 301 and a vent 302, respectively, the vent 301 is provided in the air, and the vent 302 may be located in the water. Specifically, the water inlet 302 is connected to the water pump 200, the water inlet 201 includes a communicating pipe 300, a vent 301 and a pipe connection port 440 are disposed on the communicating pipe 300, the pipe connection port 440 is disposed at one end close to the water inlet 302, a sealing ring 441 is disposed in the pipe connection port 440 and/or the water inlet 302, and the sealing ring 441 is used for sealing between an inner side wall of the pipe connection port 440 and an inner side wall of the water inlet 302.

The pipe connection port 440 is detachably connected with the water through port 302, and the switching mechanism 400 is used for switching the connection state or disconnection state between the pipe connection port 440 and the water through port 302.

The switching mechanism 400 may take various forms, and may be capable of driving the communication tube 300 to move, and at least may be capable of driving the tube connection port 440 of the communication tube 300 to move, so as to control the connection or disconnection state between the tube connection port 440 and the water port 302.

Through the switching mechanism 400, the pipe connection port 440 and the water through port 302 are in a connection state, at the moment, the water through port 302 is directly connected with the air through the communication pipe 300, at the moment, the water inlet end 201 of the water pump 200 is connected with air, the water pump 200 cannot pump water, and further, a mop cannot be cleaned, and only the mop can be spin-dried when rotating; through switching mechanism 400, also can make pipe connector 440 and water port 302 be in the non-connected state, and water in clean bucket 100 can directly be drawn to water port 302 this moment, and in the work process of water pump 200 this moment, water inlet end 201 intakes, and water pump 200 can be with water by water jet 203 blowout, washs the mop.

Regarding the switching mechanism 400, it includes a pipe body driving member 430, the pipe body driving member 430 being connected to the communication pipe 300, the pipe body driving member 430 moving to drive the pipe connection port 440 away from or close to the water passage port 302. More specifically, the switching mechanism 400 includes a rotating member 410, a cam 411, and a driving member 430, wherein the cam 411 is connected to the bottom of the rotating member 410, and the rotating member 410 is used for driving the cam 411 to rotate; the driving member 430 is provided with a slot in which the cam 411 is disposed; one side of the driving member 430 is a connection end, and the other end of the driving member 430 is a driving end 432; the slot surface of the slot near the driving end 432 is a driving surface 433, the driving surface 433 is in contact with the cam 411, and the distance from the driving surface 433 to the rotation axis of the cam 411 can be changed by rotating the cam 411, so that the movement of the driving member 430 is realized.

It should be noted that the "slot" is formed by the driving surface 433, so that the height of the portion where the cam 411 is installed is lower than the driving end 432 where the driving surface 433 is located, and the height difference forms the "slot", where the driving member 430 is the pipe driving member 430, the cam 411 is driven to rotate by the driving member 430, the distance between the axis of the cam 411 and the driving surface 433 on the driving end 432 after the cam 411 rotates is changed, and the rotation axis of the cam 411 is fixed, so that the pipe driving member 430 is pushed by the cam 411 to realize movement, and the communicating pipe 300 connected with the pipe driving member 430 is also driven, so that the position between the pipe connecting port 440 and the water through port 302 is changed, i.e. the pipe connecting port 440 is connected or disconnected with the water through port 302 is changed. A guide 442 is coupled to the communication pipe 300, the guide 442 being fixed to the inside of the cleaning bucket 100, the guide 442 being used to guide the communication pipe 300 such that the moving direction thereof is fixed.

The rotating member 410 is a rotating rod, a knob 412 is disposed at one end of the rotating rod far away from the cam 411, and the knob 412 is disposed to facilitate the rotation of the rotating member 410; in addition, the knob 412 is provided with a rotation mark, which is provided to facilitate the user in recognizing the current position of the tube driving member 430.

At the driving end 432 of the driving member 430, a return spring 420 is provided opposite to the driving surface 433, and the return spring 420 can also drive the tube driving member 430, and when the rotation of the cam 411 cannot or hardly move the tube driving member 430, the elastic force applied by the return spring 420 can move the tube driving member 430. In addition, at the driving end 432 of the driving member 430, a spring mounting member 421 is provided opposite to the driving surface 433, and the return spring 420 is mounted on the spring mounting member 421, the spring mounting member 421 is a rod-shaped mounting member, and the return spring 420 is sleeved on the rod-shaped mounting member.

The end of the return spring 420, which is far away from the driving member 430, is a fixed end, on which a fixing member 422 is provided, the fixing member 422 is used to fix the position of the fixed end, and the fixing member 422 may be installed in the cleaning bucket 100 to fix the return spring 420.

The rotation axis of the cam 411 intersects with the axis of the return spring 420, that is, the acting force of the return spring 420 is directed toward the rotation axis of the cam 411, so that the return spring 420 is more effective for driving the tube driving member 430.

In the groove of the driving member 430, a stopper surface 431 is provided on the other side of the cam 411 with respect to the driving surface 433, and the stopper surface 431 is used to restrict the rotation angle of the cam 411. Avoiding misoperation when a user uses the device. The bottom of the cleaning tub 100 is provided with a mounting groove 111, and the switching mechanism 400 is mounted in the mounting groove 111.

Regarding the structure of the mop, it can be various forms, in this patent, the mop can drive the water pump 200 to take water, the water pump 200 can also be various forms, for example can be: the water inlet end 201, the water outlet end 202, a first cavity with variable volume, a second cavity with variable volume and a one-way valve, wherein the first cavity is connected with the second cavity; the water inlet end 201 is arranged at one end of the first cavity far away from the second cavity, and the water outlet end 202 is arranged at one end of the second cavity far away from the first cavity; a first one-way valve is arranged at the joint of the first cavity and the second cavity; the first one-way valve allows water to flow from the first cavity into the second cavity and prevents water from flowing from the second cavity into the first cavity;

the water pump further comprises a transmission device, wherein the transmission device comprises a first rotary driving piece 204, the first rotary driving piece 204 is used for driving the water pump 200 to take water, and the transmission device further comprises a driving connecting piece, a driving wheel and a driving piece; the rotary driving part I is connected with the driving wheel through a driving connecting piece, and the rotary driving part I is used for driving the driving wheel to rotate; the driving piece comprises a sliding groove, and the eccentric column is matched with the sliding groove; the driving piece is provided with a guide groove, the guide groove is used for limiting the movement of the driving piece in the axial direction of the water collector, and the driving connecting piece is connected with the first one-way valve.

The mop comprises a mop rod 510, a driving wheel 520, a driven wheel 530 and a cleaning cloth 330; the mop rod comprises a rotary mop rod 511 and a driving rod 512, and the rotary mop rod 511 is sleeved with the driving rod 512; the driving lever 512 moves in the axial direction thereof to drive the rotary mop lever 511 to rotate; the driving wheel 520 is connected with the connecting end of the bottom end of the rotary mop rod 511, the driven wheel 530 is in transmission connection with the driving wheel 520, the cleaning cloth 330 is arranged at the bottom of the driven wheel 530, and a plurality of driven wheels 530 and cleaning cloths 330 are arranged.

In the use process, the user presses the driving rod 512, the driving rod drives the rotary mop rod 511 to rotate, and the structure of the driving rod and the rotary mop rod 511 can refer to but is not limited to the technical scheme described in the patent with the publication number of CN 201431427Y; the rotating mop rod 511 rotates to drive the driving wheel 520 to rotate, the driven wheels 530 and the driving wheel 520 are gears, a plurality of driven wheels 530 are meshed with the driving wheel 520, at least 3 driven wheels are arranged, and the plurality of driven wheels 530 are uniformly arranged on the periphery of the driving wheel 520; the driving wheel rotates to drive the driven wheel to rotate, and the driven wheel drives the cleaning cloth 330 to rotate, so that cleaning or spin-drying can be performed. The second rotary driving member 340 provided at the center of the bottom surface of the driving wheel is rotated.

The central position of the bottom surface of the driving wheel 520 is provided with a second rotation driving piece 340, the second rotation driving piece 340 is matched with the first rotation driving piece 204, and the second rotation driving piece 340 is used for driving the first rotation driving piece 204 to rotate.

In addition, the second rotary driving member 340 is a groove, the cross-sectional shape of the groove is not circular, the first rotary driving member 204 is a protrusion, and the protrusion is matched with the groove; or the second rotary driving member 340 is a protrusion, the cross-sectional shape of the protrusion is not circular, and the first rotary driving member 204 is a groove, and the protrusion is matched with the groove. The cross section of the grooves and the protrusions is regular hexagon.

In addition, a supporting piece 121 is arranged on the side wall of the cleaning barrel 100, a supporting part 320 is arranged at the edge of the mop, the supporting part 320 is a concave part, the supporting piece 121 is a supporting step, the mop is supported and the cleaning cloth 330 is suspended through the cooperation of the supporting piece 121 and the supporting part 320, a water purifying side wall 112 is arranged in the cleaning barrel 100, a water purifying area 101 is formed around the water purifying side wall 112 or the water purifying side wall 112 and the side wall of the cleaning barrel 100 together form the water purifying area 101, the height of the water purifying side wall 112 is not higher than that of the side wall of the cleaning barrel 100, and other areas except the water purifying area 101 in the cleaning barrel 100 are sewage areas 102.

A cover plate water purifying side wall 130 is arranged above the water purifying side wall 101 of the water purifying area, and the water jet water purifying side wall 203 is arranged on the cover plate water purifying side wall 130; the cover plate water purification lateral wall 130 is provided with a water injection hole, the periphery of the water injection hole is provided with a water injection lateral plate water purification lateral wall 131 in an upward extending mode, the top end of the water injection lateral plate water purification lateral wall 131 is provided with a water injection port water purification lateral wall 141, specifically, the top end of the water injection lateral plate water purification lateral wall 131 is provided with a water injection cover plate water purification lateral wall 140, the water injection cover plate water purification lateral wall 140 is provided with a water injection port water purification lateral wall 141, and the water injection cover plate water purification lateral wall 140 is provided with a position mark corresponding to the rotation mark.

The utility model has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will be understood that various modifications and changes may be made without departing from the scope of the utility model as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the utility model described herein. Furthermore, the background art is intended to illustrate the status and meaning of the development of the technology and is not intended to limit the utility model or the application and field of application of the utility model.

More specifically, although exemplary embodiments of the present utility model have been described herein, the present utility model is not limited to these embodiments, but includes any and all embodiments that have been modified, omitted, e.g., combined, adapted, and/or substituted between the various embodiments, as would be recognized by those skilled in the art in light of the foregoing detailed description. The limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the utility model should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims (10)

1. The rotary switching mechanism for the cleaning barrel is characterized by comprising a rotary piece (410), a cam (411) and a driving piece (430), wherein the bottom of the rotary piece (410) is connected with the cam (411), and the rotary piece (410) is used for driving the cam (411) to rotate; the driving piece (430) is provided with a groove, and the cam (411) is arranged in the groove; one side of the driving piece (430) is a connecting end, and the other end of the driving piece (430) is a driving end (432); the groove surface of the groove close to one side of the driving end (432) is a driving surface (433), the driving surface (433) is in contact with the cam (411), and the distance from the driving surface (433) to the rotation axis of the cam (411) can be changed through rotation of the cam (411), so that the movement of the driving piece (430) is realized.

2. A rotary switching mechanism for a washing tub according to claim 1, characterized in that the rotary member (410) is a rotary lever.

3. A rotary switching mechanism for a washing tub as claimed in claim 2, characterized in that the end of the rotary lever remote from the cam (411) is provided with a knob (412).

4. A rotary switching mechanism for a washing tub according to claim 3, characterized in that the knob (412) is provided with a rotary marking.

5. A rotary switching mechanism for a washing tub according to claim 1, characterized in that a return spring (420) is provided at the drive end (432) of the drive member (430) opposite to the side provided with the drive surface (433).

6. A rotary switching mechanism for a washing tub according to claim 5, characterized in that a spring mounting member (421) is provided at the driving end (432) of the driving member (430) opposite to the driving surface (433), and a return spring (420) is mounted on the spring mounting member (421).

7. The rotary switching mechanism for a washing tub as claimed in claim 6, wherein the spring mounting member (421) is a rod-shaped mounting member, and the return spring (420) is sleeved on the rod-shaped mounting member.

8. The rotary switching mechanism for a washing tub as claimed in claim 5, wherein an end of the return spring (420) remote from the driving member (430) is a fixed end, and a fixing member (422) is provided on the fixed end, the fixing member (422) being for fixing a position of the fixed end.

9. The rotary switching mechanism for a washing tub according to claim 5, wherein a rotation axis of the cam (411) intersects with an axis of the return spring (420).

10. A rotary switching mechanism for a washing tub as claimed in claim 1, characterized in that a limiting surface (431) is provided in the groove of the driving member (430) on the other side of the cam (411) with respect to the driving surface (433), said limiting surface (431) being for limiting the rotation angle of the cam (411).

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