Projection adjusting mechanism and dish washing machine

Abstract

The utility model provides a projection adjusting mechanism and dish-washing machine relates to kitchen appliance technical field, projection adjusting mechanism includes: fixed part, projection mechanism, connecting piece and adjusting structure, be equipped with the mounting wall on the fixed part, be equipped with the through-hole that connects inside and outside on the mounting wall, connecting piece and mounting wall have the same curved shape, and the adjusting structure is equipped with the through-hole that connects inside and outside. The connecting piece is attached to the inner side of the mounting wall; the adjusting structure is connected with the mounting part; the connecting piece comprises a first end and a second end which are oppositely arranged, and the first end is fixedly connected with the mounting wall; the projection mechanism is connected with the connecting piece and located between the first end and the second end, and the projection mechanism emits a projection image to the outer side through the through hole; the second end is connected with the adjusting structure, and the adjusting structure is used for adjusting the distance between the second end and the mounting wall so as to change the emergent angle of the projection mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a projection adjustment mechanism and a dishwasher. Background Art

[0002] Some dishwashers are equipped with a bottom projection module to project the current status information of the dishwasher onto the ground.

[0003] In the prior art, there is a solution of using a reflective sheet to reflect projection information. However, the installation method of the existing projection mechanism is complicated and the installation structure is difficult to form, resulting in high preparation and assembly costs. Utility Model Content

[0004] The utility model aims to provide a projection adjustment mechanism and a dishwasher, so as to alleviate the technical problems that the existing projection mechanism has a complex installation structure and a difficult molding installation structure.

[0005] In a first aspect, an embodiment of the utility model provides a projection adjustment mechanism, comprising: a fixing portion, a projection mechanism, a connecting piece and an adjustment structure, wherein a mounting wall is provided on the fixing portion, a through hole communicating with the inside and the outside is provided on the mounting wall, and the connecting piece and the mounting wall have the same curved shape so that the connecting piece fits the inner side of the mounting wall; the adjustment structure is connected to the mounting portion;

[0006] The connecting piece includes a first end and a second end that are arranged opposite to each other, and the first end is fixedly connected to the mounting wall;

[0007] The projection mechanism is connected to the connecting piece and is located between the first end and the second end, and the projection mechanism emits a projection image to the outside through the through hole;

[0008] The second end is connected to the adjustment structure, and the adjustment structure is used to adjust the distance between the second end and the installation wall to change the projection angle of the projection mechanism.

[0009] Further, the mounting wall includes a first vertical wall, an inclined wall and a second vertical wall, the first vertical wall and the second vertical wall both extend vertically, the first vertical wall is located above the second vertical wall in the vertical direction, and the second vertical wall is located in front of the first vertical wall in the front-to-back direction; the upper edge of the inclined wall is connected to the lower edge of the first vertical wall, and the lower edge of the inclined wall is connected to the upper edge of the second vertical wall; the through hole is located on the inclined wall;

[0010] The connecting piece includes a first vertical piece, an oblique piece and a second vertical piece. The first vertical piece and the second vertical piece both extend vertically. Vertically, the first vertical piece is located above the second vertical piece. In the front-to-back direction, the second vertical piece is located in front of the first vertical piece. The upper edge of the oblique piece is connected to the lower edge of the first vertical piece, and the lower edge of the oblique piece is connected to the upper edge of the second vertical piece. The projection mechanism is connected to the oblique piece.

[0011] Furthermore, the first vertical piece is fixedly connected to the first vertical wall; the adjustment structure is arranged on the second vertical wall, and the movable part of the adjustment structure is connected to the second vertical piece.

[0012] Furthermore, a downwardly turned flange is provided on the upper edge of the first vertical piece, a gap is provided between the flange and the first vertical piece, the flange is located in front of the first vertical piece, and the flange is fixedly connected to the first vertical wall.

[0013] Furthermore, the first vertical piece and the second vertical wall are connected by a first screw.

[0014] Furthermore, the second vertical piece is provided with an adjustment screw hole;

[0015] The adjusting structure comprises an adjusting screw, the adjusting screw is rotatably connected to the second vertical wall, and the adjusting screw is threadedly connected to the adjusting screw hole.

[0016] Furthermore, the projection mechanism is connected to the connection sheet by snap-fitting, threading or by a second screw.

[0017] Furthermore, the projection mechanism includes a fixing ring, a buckle is provided on the circumferential side wall of the fixing ring, a clamping hole is provided on the inclined wall, and the buckle passes through the clamping hole from bottom to top and is clamped with the upper surface of the inclined sheet.

[0018] Furthermore, the projection mechanism includes a projection module, and the projection module is detachably connected to the fixing ring.

[0019] In a second aspect, the utility model provides a dishwasher, comprising the above-mentioned projection adjustment mechanism.

[0020] The projection adjustment mechanism provided by the embodiment of the utility model includes: a fixing part, a projection mechanism, a connecting piece and an adjustment structure, wherein a mounting wall is arranged on the fixing part, a through hole connecting the inside and the outside is arranged on the mounting wall, and the connecting piece is consistent with the bending shape of the mounting wall so that the connecting piece fits on the inner side of the mounting wall; the adjustment structure is connected to the mounting part; the connecting piece includes a first end and a second end arranged opposite to each other, and the first end is fixedly connected to the mounting wall; the projection mechanism is connected to the connecting piece and is located between the first end and the second end, and the projection mechanism emits a projection image to the outside through the through hole; the second end is connected to the adjustment structure, and the adjustment structure is used to adjust the distance between the second end and the mounting wall to change the emission angle of the projection mechanism.

[0021] First, in this solution, the fixed part and the projection mechanism are only movably connected by a connecting piece, which has a simple structure and is easy to prepare. Second, when the adjustment structure changes the distance between the second end and the mounting wall, the connecting piece rotates with the fixed connection between the first end and the mounting part as the hinge point. When the inclination angle of the connecting piece changes, the angle of the incident light emitted by the projection mechanism on it to the reflector changes. By changing the incident angle of the projection mechanism, the position of the projection pattern is changed, which solves the problem of incomplete projection pattern caused by assembly or transportation in the prior art. Third, since the shape of the connecting piece is consistent with the shape of the mounting wall, the connecting piece fits the mounting wall to the greatest extent, thereby reducing the space occupied by the connecting piece and the projection mechanism.

[0022] In the second aspect, the dishwasher provided by the utility model includes the above-mentioned projection adjustment mechanism. Because the dishwasher provided by the embodiment of the utility model adopts the above-mentioned projection adjustment mechanism, the dishwasher provided by the embodiment of the utility model also has the advantages of the projection adjustment mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a dishwasher provided by an embodiment of the utility model;

[0025] Figure 2 A schematic diagram of the internal structure of a dishwasher provided by an embodiment of the utility model;

[0026] Figure 3 for Figure 2 A partial enlarged view of position A in the middle;

[0027] Figure 4 A schematic diagram of the bottom structure of a dishwasher provided by an embodiment of the utility model;

[0028] Figure 5 An assembly diagram of a reflector for a dishwasher provided in an embodiment of the utility model;

[0029] Figure 6 A schematic diagram of the internal projection of a dishwasher provided by an embodiment of the utility model;

[0030] Figure 7 A schematic diagram of a projection adjustment mechanism for a dishwasher provided in an embodiment of the utility model (the fixing part is not shown);

[0031] Figure 8 A side view of the projection adjustment mechanism of the dishwasher provided by the embodiment of the utility model (the fixing part is not shown);

[0032] Fig. 9 A schematic diagram of a fixing portion of a projection adjustment mechanism of a dishwasher provided by an embodiment of the utility model;

[0033] Fig.10 A cross-sectional view of the projection adjustment mechanism of the dishwasher provided by an embodiment of the utility model at the position of the adjustment screw.

[0034] Icons: 1-dishwasher; 2-cabinet; 3-skirting board; 4-fixing part; 41-assembly hole; 42-limiting hole; 43-assembly recess; 44-guide foot; 45-through hole; 46-first vertical wall; 47-slanted wall; 48-second vertical wall;

[0035] 51-projection module; 52-fixing ring; 6-reflector;

[0036] 7-connecting piece; 71-flange; 72-adjusting screw hole; 73-clamping hole; 74-first vertical piece; 75-oblique piece; 76-second vertical piece; 8-adjusting screw; 81-front limit protrusion; 82-rear limit protrusion; 9-first screw. DETAILED DESCRIPTION

[0037] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] like Figure 1 and Figure 2 As shown, the projection adjustment mechanism provided by the utility model can be applied to, but not limited to, a dishwasher 1, and can also be applied to other kitchen appliances, such as a disinfection cabinet, a steam oven, etc., to project the status information of the appliance to the ground in real time for users to view.

[0039] The projection adjustment mechanism comprises: a fixing part 4, a projection mechanism, a connecting piece 7 and an adjustment structure.

[0040] The fixing portion 4 is a fixed structure, for example, a support frame or a housing of an electrical appliance.

[0041] The projection mechanism is connected to the main controller of the appliance, and is used to generate a projection pattern, and project the projection pattern onto the reflector 6 on the appliance, and reflect it onto the projection surface through the reflector 6. In this embodiment, the projection surface is the ground, and in other feasible solutions, the projection surface can also be a panel provided by the appliance.

[0042] like Figure 5 and Figure 6 As shown, the reflector 6 can be connected to the fixing part 4. The reflector 6 can be fixedly connected to the fixing part 4, or can be movably connected to the fixing part 4. In this embodiment, the reflector 6 is connected by a fixed connection method. A mounting recess 43 is provided on the top surface of the fixing part 4, and the area and shape of the mounting recess 43 are substantially the same as those of the reflector 6. The mounting recess 43 is used to accommodate the reflector 6. A guide clamping foot 44 is provided around the mounting recess 43. The guide clamping foot 44 partially extends into the mounting recess 43. The guide clamping foot 44 can be deformed under external force. During installation, the reflector 6 can pass over the guide clamping foot 44 and enter the mounting recess 43. After the reflector 6 enters the mounting recess 43, the guide clamping foot 44 returns to its original state, which can support the reflector 6 and prevent it from falling from the mounting recess 43. Of course, the reflector 6 can also be connected to the fixing part 4 by other conventional mechanical connection methods, for example, directly pasted on the fixing part 4 by adhesive.

[0043] like Figure 4 As shown, a mounting wall is provided on the fixing portion 4, the mounting wall is located below the top surface, and a through hole 45 connecting the inside and the outside is provided on the mounting wall. The through hole 45 is used to allow the projection pattern generated by the projection mechanism on the inside of the mounting wall to be projected onto the reflector 6 on the outside of the mounting wall.

[0044] like Figure 8 As shown, the connection piece 7 is consistent with the curved shape of the installation wall, so that the connection piece 7 fits the inner side of the installation wall, making full use of the space and preventing the connection piece 7 and the projection mechanism from occupying too much internal space of the appliance.

[0045] The adjustment structure is connected to the mounting portion, and the user changes the inclination angle of the connecting piece 7 through the adjustment mechanism. The connecting piece 7 includes a first end and a second end that are arranged opposite to each other, and the first end is fixedly connected to the mounting wall, and the connection forms a hinge point during adjustment. The projection mechanism is connected to the connecting piece 7 and is located between the first end and the second end. The projection mechanism emits a projected image to the outside through the through hole 45. The second end is connected to the adjustment structure, and the adjustment structure can change the distance between the second end and the mounting wall by pushing and pulling to change the projection angle of the projection mechanism.

[0046] The advantages of this solution are as follows: First, in this solution, the fixed part 4 and the projection mechanism are only movably connected through the connecting piece 7, which has a simple structure and is easy to prepare. Second, when the adjustment structure changes the distance between the second end and the mounting wall, the connecting piece 7 rotates with the fixed connection between the first end and the mounting part as the hinge point. After the inclination angle of the connecting piece 7 changes, the angle of the incident light emitted by the projection mechanism on it to the reflector changes. By changing the incident angle of the projection mechanism, the position of the projection pattern is changed, which solves the problem of incomplete projection pattern caused by assembly or transportation in the prior art. Third, since the shape of the connecting piece 7 is consistent with the shape of the mounting wall, the connecting piece 7 fits the mounting wall to the greatest extent, thereby reducing the space occupied by the connecting piece 7 and the projection mechanism.

[0047] Specifically, Figure 8 As shown, the mounting wall is bent in a "Z" shape, and includes a first vertical wall 46, an inclined wall 47 and a second vertical wall 48. The first vertical wall 46 and the second vertical wall 48 both extend vertically. In the vertical direction, the first vertical wall 46 is located above the second vertical wall 48, and in the front-to-back direction, the second vertical wall 48 is located in front of the first vertical wall 46; the upper edge of the inclined wall 47 is connected to the lower edge of the first vertical wall 46, and the lower edge of the inclined wall 47 is connected to the upper edge of the second vertical wall 48; the through hole 45 is located on the inclined wall 47; correspondingly, the connecting piece 7 is also roughly bent in a "Z" shape, and includes a first vertical piece 74, an inclined piece 75 and a second vertical piece 76. The first vertical piece 74 and the second vertical piece 76 both extend vertically. In the vertical direction, the first vertical piece 74 is located above the second vertical piece 76, and in the front-to-back direction, the second vertical piece 76 is located in front of the first vertical piece 74; the upper edge of the inclined piece 75 is connected to the lower edge of the first vertical piece 74, and the lower edge of the inclined piece 75 is connected to the upper edge of the second vertical piece 76. Among them, the first vertical piece 74 is parallel to and fits with the first vertical wall 46, the inclined piece 75 is parallel to and fits with the inclined wall 47, and the second vertical piece 76 is parallel to and fits with the second vertical wall 48. The projection mechanism is connected to the inclined piece 75.

[0048] In other feasible solutions, the bending condition of the installation wall may also be different from that in the present embodiment, and correspondingly, the bending condition of the connecting piece 7 may also be changed accordingly.

[0049] like Figure 3 , Figure 7 and Figure 8As shown, the first vertical piece 74 is fixedly connected to the first vertical wall 46, and this will become a hinge point when adjusting the light output angle later. In this solution, the first vertical piece 74 and the first vertical wall 46 are connected by the first screw 9, and the first vertical piece 74 and the first vertical wall 46 are respectively provided with first screw holes. During installation, the first vertical piece 74 and the first vertical wall 46 are aligned with the first screw holes, and then the first screw 9 is screwed in. In order to achieve a stable connection, the number of the first screw holes on the first vertical piece 74 and the first vertical wall 46 can be two, and the two first screw holes are arranged at intervals on the left and right. The first vertical piece 74 and the first vertical wall 46 are connected by two first screws 9.

[0050] The adjustment structure is disposed on the second vertical wall 48 , and the movable portion of the adjustment structure is connected to the second vertical piece 76 .

[0051] like Figure 3 and Figure 8 As shown, the second vertical piece 76 is provided with an adjusting screw hole 72 ; the adjusting structure includes an adjusting screw 8 , the adjusting screw 8 is rotatably connected to the second vertical wall 48 , and the adjusting screw 8 is threadedly connected to the adjusting screw hole 72 .

[0052] The user rotates the adjustment screw 8, and the second vertical wall 48 moves toward or away from the second vertical wall 48, thereby changing the inclination angle of the connecting piece 7. After stopping the adjustment, the second vertical piece 76 maintains the current position unchanged, and there is no need to set a separate locking structure.

[0053] The adjusting screw 8 only rotates relative to the second vertical wall 48 without generating axial movement, so as to facilitate the adjustment of the position of the second vertical piece 76. Fig.10 As shown, a front limit protrusion 81 and a rear limit protrusion 82 protruding outward are provided on the peripheral wall of the rod portion of the adjusting screw 8, the front limit protrusion 81 is located on one side of the second vertical wall 48, and the rear limit protrusion 82 is located on the other side of the second vertical wall 48. Both the front limit protrusion 81 and the rear limit protrusion 82 cannot pass through the second vertical wall 48, and are used to prevent the adjusting screw 8 from moving axially relative to the second vertical wall 48 along the adjusting screw 8.

[0054] like Figure 7 As shown, the adjusting screw hole 72 is arranged at the edge of the connecting piece 7, rather than in the middle, to avoid the user's hand blocking the projection pattern during adjustment. In this embodiment, the adjusting screw 8 is close to the left edge or the right edge of the connecting piece 7, rather than in the middle.

[0055] In order to facilitate the assembly of the adjusting screw 8, an assembly hole 41 and a limiting hole 42 are provided on the second vertical wall 48. The assembly hole 41 is connected to the limiting hole 42, and the width of the connection between the two is smaller than the diameter of the rod of the adjusting screw 8; the diameter of the assembly hole 41 is greater than or equal to the diameter of the front limiting protrusion 81; the diameter of the limiting hole 42 is smaller than the diameters of the front limiting protrusion 81 and the rear limiting protrusion 82.

[0056] like Fig. 9 As shown, the cross-sectional shape of the assembly hole 41 and the limiting hole 42 after being connected is roughly in the shape of an "8", and the connection between the two is relatively narrow to prevent the rod of the adjusting screw 8 from passing smoothly. During assembly, the adjusting screw 8 is first passed through the assembly hole 41, and after the front limiting protrusion 81 completely passes through the assembly hole 41, the adjusting screw 8 is pressed downward to make the rod pass through the connection between the assembly hole 41 and the limiting hole 42. Under the action of external force, the connection can be deformed to make the rod enter the limiting hole 42. The subsequent adjustment of the adjusting screw 8 is completed in the limiting hole 42, and the front limiting protrusion 81 and the rear limiting protrusion 82 cannot pass through the limiting hole 42. Therefore, the adjusting screw 8 can only rotate relative to the second vertical wall 48, and cannot produce axial movement.

[0057] like Figure 8 As shown, in order to further increase the elasticity of the connecting piece 7 and make the adjustable tilt angle of the connecting piece 7 larger, the upper edge of the first vertical piece 74 is provided with a downwardly turned flange 71, a gap is provided between the flange 71 and the first vertical piece 74, the flange 71 is located in front of the first vertical piece 74, and the flange 71 is fixedly connected to the first vertical wall 46. The first vertical piece 74 and the flange 71 form a "U"-shaped structure, forming an elastic support with a larger deformation space.

[0058] In order to facilitate the connection between the projection mechanism and the connecting piece 7 , the projection mechanism and the connecting piece 7 may be connected by a clamping connection, a threaded connection or a second screw.

[0059] like Figure 7 As shown, in this embodiment, the projection mechanism includes a fixing ring 52, a buckle is provided on the circumferential side wall of the fixing ring 52, a clamping hole 73 is provided on the inclined wall 47, the buckle is engaged with the clamping hole 73, and the buckle passes through the clamping hole 73 from bottom to top and then is engaged with the upper surface of the inclined sheet 75. The number of buckles is ≥ 2, preferably 3 are evenly distributed, the structural strength is good, the structure is stable and not easy to shake, and the anti-drop strength is good.

[0060] Furthermore, in order to match the connecting piece 7 with different projection modules 51, the projection mechanism includes a projection module 51, and the projection module 51 is detachably connected to the fixing ring 52, for example, by a threaded connection. In this way, different projection modules 51 can be matched and installed with the connecting piece 7 by replacing the fixing ring 52.

[0061] The material of the connecting piece 7 can be metal or plastic.

[0062] The reflector 6 can be made of glass or metal.

[0063] The head of the adjusting screw 8 is provided with a flat-blade shape, which is convenient for adjustment using a flat-blade screwdriver, thereby improving the convenience of adjustment.

[0064] The dishwasher 1 provided by the present invention includes the above-mentioned projection adjustment mechanism. Since the dishwasher 1 provided by the embodiment of the present invention uses the above-mentioned projection adjustment mechanism, the dishwasher 1 provided by the embodiment of the present invention also has the advantages of the projection adjustment mechanism.

[0065] The dishwasher 1 is embedded in the cabinet 2, and a skirting board 3 is installed at the bottom of the cabinet 2. The entire projection adjustment mechanism is located at the bottom of the dishwasher 1.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A projection adjustment mechanism, characterized in that: include: A fixing portion (4), a projection mechanism, a connecting piece (7) and an adjustment structure, wherein the fixing portion (4) is provided with a mounting wall, the mounting wall is provided with a through hole (45) communicating with the inside and outside, the connecting piece (7) is consistent with the curved shape of the mounting wall, so that the connecting piece (7) fits on the inner side of the mounting wall; the adjustment structure is connected to the fixing portion; The connecting piece (7) comprises a first end and a second end which are arranged opposite to each other, and the first end is fixedly connected to the mounting wall; The projection mechanism is connected to the connecting piece (7) and is located between the first end and the second end, and the projection mechanism emits a projection image to the outside through the through hole (45); The second end is connected to the adjustment structure, and the adjustment structure is used to adjust the distance between the second end and the installation wall to change the projection angle of the projection mechanism.

2. The projection adjustment mechanism according to claim 1, characterized in that: The mounting wall comprises a first vertical wall (46), an inclined wall (47) and a second vertical wall (48); the first vertical wall (46) and the second vertical wall (48) both extend vertically; in the vertical direction, the first vertical wall (46) is located above the second vertical wall (48); in the front-to-back direction, the second vertical wall (48) is located in front of the first vertical wall (46); the upper edge of the inclined wall (47) is connected to the lower edge of the first vertical wall (46), and the lower edge of the inclined wall (47) is connected to the upper edge of the second vertical wall (48); the through hole (45) is located on the inclined wall (47); The connecting piece (7) comprises a first vertical piece (74), an inclined piece (75) and a second vertical piece (76); the first vertical piece (74) and the second vertical piece (76) both extend in the vertical direction; in the vertical direction, the first vertical piece (74) is located above the second vertical piece (76); in the front-to-back direction, the second vertical piece (76) is located in front of the first vertical piece (74); the upper edge of the inclined piece (75) is connected to the lower edge of the first vertical piece (74), and the lower edge of the inclined piece (75) is connected to the upper edge of the second vertical piece (76); the projection mechanism is connected to the inclined piece (75).

3. The projection adjustment mechanism according to claim 2, characterized in that: The first vertical piece (74) is fixedly connected to the first vertical wall (46); the adjustment structure is arranged on the second vertical wall (48), and the movable part of the adjustment structure is connected to the second vertical piece (76).

4. The projection adjustment mechanism according to claim 3, characterized in that: The upper edge of the first vertical piece (74) is provided with a downwardly turned flange (71), a gap is provided between the flange (71) and the first vertical piece (74), the flange (71) is located in front of the first vertical piece (74), and the flange (71) is fixedly connected to the first vertical wall (46).

5. The projection adjustment mechanism according to claim 3, characterized in that: The first vertical piece (74) and the second vertical wall (48) are connected by a first screw (9).

6. The projection adjustment mechanism according to claim 2, characterized in that: The second vertical piece (76) is provided with an adjusting screw hole (72); The adjustment structure comprises an adjustment screw (8), wherein the adjustment screw (8) is rotatably connected to the second vertical wall (48), and the adjustment screw (8) is threadedly connected to the adjustment screw hole (72).

7. The projection adjustment mechanism according to claim 2, characterized in that: The projection mechanism is connected to the connecting piece (7) by snapping, threading or by a second screw.

8. The projection adjustment mechanism according to claim 2, characterized in that: The projection mechanism comprises a fixing ring (52), a buckle is provided on the circumferential side wall of the fixing ring (52), a clamping hole (73) is provided on the inclined wall (47), and the buckle passes through the clamping hole (73) from bottom to top and then clamps with the upper surface of the inclined sheet (75).

9. The projection adjustment mechanism according to claim 8, characterized in that: The projection mechanism comprises a projection module (51), and the projection module (51) is detachably connected to the fixing ring (52).

10. A dishwasher, characterized in that: It comprises the projection adjustment mechanism described in any one of claims 1 to 9.

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