Material quantity adjusting device for limiting stroke of material needle of paint spray gun, paint spray gun having material quantity adjusting device, and method for applying coating material

Abstract

The invention relates to a material quantity adjusting device (1) for limiting the stroke of a material needle of a hand-held paint gun (3), comprising: a front end (4) which has a retaining mechanism (5), in particular in the form of a thread (14), by means of which the material quantity adjusting device (1) can be fastened to the paint gun (3); a rear end (6) opposite the front end (4); a stop surface (7) for limiting the stroke (2) of the material needle; an adjusting mechanism (8), in particular formed by a part of the retaining mechanism (5) in the form of a thread (14), by means of which the axial position of the stop surface (7) can be adjusted in the axial direction in order to limit the material needle stroke in such a way as to interact with a corresponding mating element (9) of the paint spray gun (3); a quick adjusting mechanism (10), by means of which the stop surface (7) can be adjusted back and forth relative to the adjusting mechanism (8) in the axial direction (13) between a stroke limiting position and a stroke opening position different from the stroke limiting position without changing the axial position of the stop surface (7) set by means of the adjusting mechanism (8), the material quantity adjusting device (1) is not removed from the paint spraying gun (3); the stop surface (7) is arranged at least in the stroke limiting position at the height of the retaining mechanism (5) in the axial direction (13) or is arranged offset in the axial direction (13) relative to the retaining mechanism (5) in the direction of the rear end (6) of the material quantity adjusting device (1).

Description

Technical Field

[0001] The present invention relates to a material quantity regulating device for limiting the material needle stroke of a paint spray gun, the material quantity regulating device comprising: a front end, the front end having a holding mechanism, by means of which the material quantity regulating device can be fixed to the paint spray gun; a rear end, the rear end being opposite to the front end; a stop surface, the stop surface being used to limit the material needle stroke; an adjustment mechanism, via which the axial position of the stop surface can be adjusted in a manner that interacts with a corresponding matching element of the paint spray gun to limit the material needle stroke; and a quick adjustment mechanism, by means of which the stop surface can be reciprocated relative to the adjustment mechanism in the axial direction between a stroke limiting position and a stroke opening position different from the stroke limiting position without changing the setting of the adjustment mechanism (8) and without removing the material quantity regulating device from the paint spray gun.

[0002] The invention further relates to a paint spray gun for dispensing coating material, the paint spray gun having a material needle and a material quantity control device for limiting the stroke of the material needle, and to a method for applying coating material by means of a paint spray gun. Background Art

[0003] Material quantity regulating devices are used, for example, in the field of painting technology, wherein the material quantity regulating device is used to provide a stop for the end of a material needle that controls the material output amount, which is opposite to the material output direction, by means of a stop surface. Usually, the material quantity regulating device is fixed to the end of the paint spray gun opposite to the material nozzle of the paint spray gun in the material output direction. The fixing is usually carried out via a drill hole in the body of the paint spray gun, which has an internal thread. The material quantity regulating device has a corresponding external thread and is screwed into the drill hole. By changing the screw-in depth of the material quantity regulating device, the stop of the material quantity regulating device can be reciprocated in the axial direction, thereby limiting the maximum material needle stroke of the material needle more or less.

[0004] For some purposes of use or for certain coating materials, it is desirable to limit the material output, for example in order to achieve a particular surface effect. For other purposes of use, it is necessary to be able to output a maximum amount of material. For this purpose, it is advantageous to be able to switch quickly between two positions. Such a switchable material quantity control device is known from JPH4126562.

[0005] JPH4126562 describes a material quantity regulating device, by means of which it is possible to switch back and forth between a fully open position and a half-open position. In particular, it should be possible for untrained workers to achieve a high surface quality. This should be achieved by applying multiple layers with the same layer thickness in the half-open position instead of a single layer in the fully open position as usual. If small or rough surfaces are involved, trained workers should apply multiple layers with the same layer thickness in the half-open position. For switching, the rear end of the material quantity regulating device is pushed forward in the material output direction, then rotated 90° and pushed back again.

[0006] This solution meets the requirement of fast reciprocating switching between the first position of the stop surface and the second position of the stop surface. However, the material quantity regulating device is particularly bulky due to its construction and cannot be installed on a conventional paint spray gun without modification. When the material quantity regulating device is disassembled, the end of the material needle is hidden in the gun body of the paint spray gun, so that the material needle is difficult to remove. Summary of the invention

[0007] Based on the prior art, the object of the present invention is to create a material needle adjustment device with a compact design. In addition, the object of the present invention is to provide a paint spray gun with a corresponding material needle adjustment device and a corresponding method for applying coating materials by means of a quickly adjustable material quantity adjustment device.

[0008] The material quantity adjustment device can be used in a paint spray gun that consists essentially of a base body with a gun handle, a nozzle head, a trigger, and a material guide system with a material needle and a material quantity adjustment device for setting the maximum material needle stroke, by means of which the material quantity to be applied can be determined. Likewise, automatic paint spray guns are also possible, which do not have a gun handle and a trigger and are automatically operated by means of a trigger mechanism.

[0009] The paint spray gun can be a pressure atomizing paint spray gun and an air atomizing paint spray gun. In the case of a pressure atomizing paint spray gun, the material to be atomized is placed under high pressure, and when the material comes out of the mouth of the material nozzle under high pressure, the material is atomized through interaction with the surrounding air. In the case of an air atomizing paint spray gun, an air supply interface is additionally provided, by means of which a compressed air supply device, a compressed air channel for guiding compressed air, an air guiding system with an air valve, and an air quantity setting device for setting the compressed air quantity can be connected. In the case of an air atomizing paint spray gun, the compressed air required for atomization is delivered at the air supply interface, and the air supply interface is arranged at or in the gun handle. The air valve is opened by operating the trigger to the first pressure point. When the trigger is further pulled, the material needle is additionally pulled out of the material nozzle. The coating agent then flows out of the nozzle due to gravity or pressure difference and is atomized by the compressed air flowing out of the nozzle through an air nozzle designed in the form of an annular gap and surrounding the material nozzle, and is transported in the material output direction to the object to be coated, where the material is deposited and forms a coating film.

[0010] The nozzle head of such a paint spray gun has a material guide area, through which the material to be atomized flows from the coating agent inlet to the material nozzle. A material supply device is provided at the coating agent inlet, which can be provided, for example, in the form of a supply line of a storage container or an external material storage device. Common storage containers are, for example, flow cups, suction cups or side cups. The pressure difference required for material delivery is formed, for example, by gravity or by a material delivery device that puts the material to be delivered under pressure. It is also possible to deliver the material by negative pressure, which is generated by air flowing through the material nozzle, whereby the material is subjected to suction.

[0011] This paint spray gun offers the user a variety of setting options. The air flow rate can be set with the aid of an air quantity setting device. The round / wide jet adjustment enables the jet shape of the aerosol leaving the paint spray gun to be changed. For this purpose, two or more angled elements with angled air nozzles are provided at the nozzle head, which are diametrically opposed to the material nozzle. The angled air nozzles are directed inwards at the leaving coating material jet. If no air flow flows out at the angled air nozzles, the coating material jet diffuses uniformly in all directions laterally after leaving the nozzle and forms a material jet with a circular cross section. If air flows out at the angled air nozzles, the coating material jet forms a material jet with an elliptical cross section after leaving the material nozzle.

[0012] The material quantity regulating device limits one side of the path along which the material needle can move along its own axis. On the opposite side, the path is limited by the material nozzle. The greater the displacement of the stop surface of the material quantity regulating device in the material output direction, the more the material quantity regulating device shortens the path along which the material needle can move when the trigger is actuated, thereby limiting the maximum material volume flow. When the trigger is not actuated, the material needle is held in the material nozzle by the compression spring and thus seals the material nozzle. When the trigger is actuated, the material needle moves outward from the material nozzle and continues to release the material needle.

[0013] According to the invention, a material quantity regulating device for limiting the stroke of a material needle of a preferably hand-held paint spray gun is proposed. The material quantity regulating device has a holding mechanism, in particular a holding mechanism in the form of a thread, by means of which the material quantity regulating device can be fixed to the paint spray gun. The rear end is opposite to the front end. In addition, the material quantity regulating device has a stop surface, which is used to limit the material needle stroke; an adjustment mechanism, which is particularly formed by a part of the holding mechanism designed in the form of a thread, through which the axial position of the stop surface can be adjusted axially in a manner that interacts with a corresponding matching element of the paint spray gun to limit the material needle stroke. In addition, the material quantity regulating device has a quick adjustment mechanism, by means of which the stop surface can be reciprocated relative to the adjustment mechanism in the axial direction between a stroke limiting position and a stroke opening position different from the stroke limiting position. Here, the setting of the adjustment mechanism is not changed or the axial position of the stop surface set by means of the adjustment mechanism is not changed, and the material quantity regulating device is not removed from the paint spray gun. The stop surface is arranged at the height of the holding mechanism in the axial direction at least in the stroke-limiting position, or is arranged to be offset in the axial direction relative to the holding mechanism in the direction of the rear end of the material quantity regulating device. Non-disassembly of the material quantity regulating device is understood to mean that the material quantity regulating device is not removed from the paint spray gun, but remains connected to the paint spray gun. Preferably, the stop surface is closer to the front end of the material quantity regulating device in the stroke-limiting position than in the stroke-opening position. The described design of the material quantity regulating device enables a particularly compact construction, thereby simplifying the operation by the user.

[0014] The stroke-open position can be understood as a position of the material quantity regulating device in which the stop surface does not limit or only limits the axial movement of the material needle of the paint spray gun when dispensing the coating material. Thus, the trigger of the paint spray gun can be operated to a position in which the maximum amount is dispensed. The stroke-limited position can be understood as a position of the material quantity regulating device in which the stop surface of the material quantity regulating device limits the axial movement of the material needle of the paint spray gun in such a way that the material needle of the paint spray gun can only be displaced axially opposite to the material dispensing direction to such an extent that a reduced amount of coating material can be dispensed relative to the maximum amount of coating material in the stroke-open position. Preferably, the amount of coating material that can be dispensed in the stroke-limited position is greater than one third, in particular greater than one half, of the coating material that can be dispensed in the stroke-open position. Particularly preferably, more than two thirds, preferably more than 80%, of the maximum amount of material can be dispensed in the stroke-limited position.

[0015] In another preferred design, the material quantity regulating device has a front end and a rear end opposite to the front end, wherein the front end has a holding mechanism and an adjusting mechanism, wherein the adjusting mechanism extends from the front end toward the rear end. In addition, a stop surface for limiting the stroke of the material needle and a quick adjustment mechanism separated from the adjusting mechanism are provided, by means of which the stop surface can be reciprocated in the axial direction between a stroke limiting position and a stroke opening position different from the stroke limiting position relative to the holding mechanism. Here, the stop surface is arranged at the height of the holding mechanism in the axial direction at least in the stroke limiting position, or is arranged offset relative to the holding mechanism in the axial direction toward the rear end of the material quantity regulating device. Since the stop surface is arranged offset backward relative to the adjusting mechanism in this structure, a particularly compact structure can also be achieved, which simplifies the operation by the user.

[0016] In a particularly preferred design, the stop surface is arranged at least in the stroke-limited position at the height of the adjustment mechanism or offset relative to the adjustment mechanism in the axial direction in the direction of the rear end of the material quantity regulating device, the stop surface preferably being arranged closer to the rear end than being arranged at the front end of the material quantity regulating device. In addition, the material quantity regulating device can also be arranged at the height of the adjustment mechanism or offset relative to the adjustment mechanism in the direction of the rear end of the material quantity regulating device in the stroke-released position, preferably closer to the rear end than being arranged at the front end of the material quantity regulating device. The advantage of the design is that the stop surface for the material needle of the paint spray gun is further moved backwards, which further shortens the required length of the material quantity regulating device, which produces a more compact structure. Preferably, the material quantity regulating device is preferably designed so that when the trigger is pulled, the material needle of the paint spray gun extends into the material quantity regulating device at least over half of the length of the material quantity regulating device, preferably over at least two thirds of the length of the material quantity regulating device.

[0017] Particularly preferably, the material quantity regulating device has a cavity which extends from the front end of the material quantity regulating device in the direction of the rear end of the material quantity regulating device into the interior of the material quantity regulating device and is designed to accommodate a material needle of a paint spray gun. The cavity enlarges the space for the material needle of the paint spray gun in the material quantity regulating device, which results in: the design of the material quantity regulating device is further reduced.

[0018] Preferably, in the axial direction, the stop surface is closer to the front end of the material quantity regulating device in the stroke-limited position than in the stroke-released position. In this case, the stop surface is preferably positioned in the stroke-limited position within the half of the material quantity regulating device, which half includes the rear end of the material quantity regulating device. Since the stop surface is also located particularly far away at the rear end of the material quantity regulating device in the stroke-limited position, a particularly compact design is possible.

[0019] In another preferred embodiment, a locking mechanism is provided, by means of which the material quantity adjustment device can be locked in the axial direction relative to the paint spray gun in a position set by the adjustment mechanism, wherein the locking mechanism is preferably designed as a lock nut. This reduces the risk of accidental adjustment of the adjustment mechanism.

[0020] Preferably, the material quantity regulating device has an adjusting element, in particular a sleeve-shaped adjusting element, which comprises an adjusting mechanism. In addition, a stop element, in particular a sleeve-shaped stop element, which comprises a stop surface is preferably provided. The stop element and the adjusting element are preferably displaceable relative to each other in the axial direction. Here, the stop surface and preferably the entire stop element are supported relative to the adjusting element in such a way that they can be axially displaced between a stroke-limiting position and a stroke-release position.

[0021] Particularly preferably, the stop element is at least partially arranged inside the adjustment element and / or the adjustment element is at least partially arranged inside the stop element. The nested construction creates a particularly compact material quantity adjustment device that requires particularly few components and provides a large interior space for accommodating the material needle of the paint spray gun.

[0022] In another particularly preferred embodiment, the stop element and the adjusting element each have a shoulder, which abuts against each other in the stroke open position. By means of the shoulders of the stop element and the adjusting element, a particularly simple maximum stop is created for the stroke open position, which is sufficient without additional components.

[0023] Preferably, the material quantity adjusting device is designed such that the adjustment of the stop surface by means of the quick-acting adjusting mechanism is carried out when the stop surface is moved in the axial direction, preferably only when the stop surface is moved in the axial direction, and / or the adjustment of the stop surface by means of the adjusting mechanism is carried out by a screwing movement about the center axis of the material quantity adjusting device. By means of the above-mentioned movement for adjustment, the quick-acting adjusting mechanism can be operated particularly easily, wherein the adjusting mechanism can be operated particularly precisely.

[0024] Particularly preferably, the quick adjustment mechanism is designed so that it is locked autonomously in the stroke limiting position and / or the stroke opening position. Therefore, the quick adjustment mechanism is automatically protected from being adjusted back, which improves the functional safety of the quick adjustment mechanism.

[0025] Preferably, the quick-release mechanism comprises a protective element for locking the quick-release mechanism in the stroke-limiting position and / or the stroke-release position, wherein the protective element preferably at least partially surrounds the adjustment element and / or the stop element in the circumferential direction. The protective element prevents an autonomous adjustment of the selected stroke-release position or stroke-limiting position.

[0026] In a particularly preferred embodiment, the quick-acting adjustment mechanism is automatically adjusted from the stroke-limited position to the stroke-released position by pulling back the protective element. The automatic adjustment from the stroke-limited position to the stroke-released position is preferably carried out by means of a force which acts on the stop element in the axial direction opposite to the front end of the material quantity adjustment device and is generated by a spring element. The spring element in the material quantity adjustment device and also in the spray gun can be used for this, which moves the material needle back into the sealing seat of the material valve when the material valve is open.

[0027] In a further particularly preferred embodiment, the material quantity regulating device has a sleeve-shaped adjusting element and a sleeve-shaped stop element which is arranged partially within the adjusting element and is coaxially supported on an inner surface of the sleeve-shaped adjusting element.

[0028] In a particularly preferred development, the adjustment element is provided with an external thread, which forms the retaining means and the adjustment means. A locking means in the form of a locking nut is provided on the external thread. The axial position of the stop surface in the stroke-limiting position and the stroke-opening position can be set via the adjustment element by means of the thread.

[0029] In a further embodiment, the stop element can be closed at the end opposite the front end of the material quantity regulating device and the stop surface can be formed on the inner side of the closed end.

[0030] In an advantageous further development of the invention, a shoulder can be provided on the outer side of the stop element in the area of ​​the open end of the stop element opposite to the closed end, which shoulder abuts against a shoulder on the inner surface of the adjustment element in the stroke open position and blocks the movement of the stop element in the axial direction from the front end of the material quantity regulating device toward the rear end of the material quantity regulating device, wherein the built-in stop element in the stroke open position moves to the greatest extent in the direction of the rear end of the material quantity regulating device.

[0031] In a preferred variant of the invention, the stop element can have a circumferential groove in the area of ​​the closed end and the adjusting element can have a bore in the rear area, in which the ball is supported in a manner that allows it to move relative to the axial direction, wherein in the safety position the position of the bore is at the same height in the axial direction as the position of the circumferential groove and the stop element moves toward the front end within the adjusting element.

[0032] In another embodiment, an additional sleeve-shaped protective element can be provided, which surrounds the region of the rear end of the material quantity regulating device in the region of the bore and the surrounding groove. The sleeve element can have a larger open inner diameter arranged in front in the axial direction and a smaller protective inner diameter arranged in the rear in the axial direction.

[0033] Particularly preferred is an embodiment in which the protective element is supported displaceably in the axial direction on the adjustment element and / or the stop element so that it can be moved back and forth in the axial direction between a protective position and an open position. In this case, in the protective position, the surrounding groove, the bore and the protective inner diameter can be located at the same height in the axial direction, while in the open position, the surrounding groove, the bore and the open inner diameter can be located at the same height in the axial direction.

[0034] In the protective position, the ball can be pressed into or engaged in a circumferential groove of the stop element, wherein the mobility of the ball in a radial direction and away from the center axis of the material quantity adjusting device is limited by a smaller protective inner diameter in such a way that the ball remains engaged with the circumferential groove, thereby preventing axial mobility of the stop element relative to the material quantity adjusting device.

[0035] In the open position, the ball can be deflected radially outwardly away from the center axis of the material quantity adjusting device due to the larger open inner diameter so that the ball no longer engages in the circumferential groove, whereby the stop element can be moved back and forth in the axial direction relative to the adjusting element between the open position and the protective position.

[0036] In a particularly preferred embodiment, a spring element can be provided which applies a force from the protective element to the stop element in an axial direction and in the direction of the rear end of the material quantity regulating device, which force automatically moves the stop element backwards in the open position and holds it in the open position.

[0037] The spring element can exert a force on the protective element directed in the axial direction and in the direction of the front end of the material quantity regulating device, which force automatically moves the protective element forward and holds it in the protective position, whereby the ball remains engaged with the groove.

[0038] By means of the proposed design features, a material quantity regulating device can be created which is particularly compact in construction and can be operated particularly simply. Such a material quantity regulating device at an existing paint spray gun can also be replaced by a conventionally installed material quantity regulating device without having to make any changes to the paint spray gun, and conventional material needles can also be used without having to adapt the length of the material needle. As a result, no additional components have to be produced, which reduces the production costs.

[0039] The present invention also relates to a paint spray gun, in particular a hand-held paint spray gun, for dispensing coating material, the paint spray gun having a material needle and a material quantity regulating device for limiting the stroke of the material needle having one or more of the above-mentioned features, wherein the material quantity regulating device is preferably fixed directly to the paint spray gun or fixed to the paint spray gun via at least one intermediate component. The fixing element used to fix the material quantity regulating device to the paint spray gun can also be used to set the stroke limiting position. For example, the fixing is performed by means of an external thread on the material quantity regulating device and an internal thread arranged in a channel around the material needle of the paint spray gun. If the material quantity regulating device is screwed in or out by means of a thread, the position of the stop surface can be set in the axial direction. By having such a paint spray gun with such a material quantity regulating device, it is possible to switch back and forth between the stroke limiting position and the stroke opening position particularly quickly and functionally safely, thereby simplifying the operation of the paint spray gun.

[0040] In another preferred design of the paint spray gun, the stop surface limits the maximum axial deflection of the material needle in the direction of the rear end of the material quantity regulating device in the stroke limiting position, so that a coating material amount reduced relative to the stroke open position can be output. Preferably, in the stroke open position, the maximum deflection of the material in the axial direction and in the direction of the rear end of the material quantity regulating device is not limited by the stop surface, so that the maximum feasible coating material amount can be output. Preferably, the output of the maximum feasible coating material amount can be preferably understood as the following amount, in which the coating material amount that can be output can no longer or only slightly be reduced by limiting the material needle stroke. In this article, "slightly" can preferably be understood as a reduction of less than 5% in the maximum outputtable material amount. Therefore, in the stroke open position, the maximum outputtable material amount is preferably limited decisively by the structure of the material nozzle and is not limited by the material needle stroke.

[0041] The invention also relates to a method for applying coating material by means of a paint spray gun, in particular a paint spray gun having one or more of the above-mentioned features and or a paint spray gun having one or more of the above-mentioned features. Usually, the material quantity regulating device is first set into a closed position by means of an adjustment element, in which the stop of the material quantity regulating device for the material needle of the paint spray gun is displaced to the maximum extent in the material output direction. This state forms the zero point or starting position. In this state, the material quantity control device can be completely closed. The stop surface of the material quantity regulating device can also completely block the movement of the material needle of the paint spray gun in the axial direction.

[0042] Within the scope of the method according to the invention, a material quantity regulating device is set to a stroke-limiting position by means of an adjusting element, in which a stop surface allows the material needle to move in the axial direction up to a freely definable intermediate position, in which a reduced amount of material can be output. Subsequently, a quick-acting adjusting mechanism of the material quantity regulating device is operated, by means of which the stop surface is transferred from the stroke-limiting position to a stroke-opening position without operating the adjusting element, in which the material needle can be opened in the axial direction up to a maximum position and an unreduced or slightly reduced amount of material can be output. As a next step, a coating material layer is applied to the object to be coated with the maximum possible (unreduced) material output. After the lower material layer is applied, the quick-acting adjusting mechanism is operated, by means of which the stop surface can be transferred to the stroke-limiting position, in which a reduced amount of material can be output. In this case, the adjusting element is not operated. As a next step, a coating material layer is then applied with a reduced material output. By means of the method, a lower material layer with a greater layer thickness is first applied, followed by an upper material layer, which preferably has a smaller layer thickness due to the reduced amount of material. By means of this method, the coating material layers can be applied reproducibly preferably with one or two different layer thicknesses, wherein a particularly high surface quality can be achieved by means of an upper layer with a smaller layer thickness. In the case of a smaller layer thickness, various effects can also be achieved better. Unlike in the case of applying a plurality of identical thin material layers, it is possible to work faster and there is no risk of the coating material drying out before the coating process is finished. Unlike in the described method, different coating materials can also be used for the two layers. It is also possible to apply further layers of different layer thicknesses.

[0043] The invention also relates to a method for applying a coating material by means of a paint spray gun, in particular a paint spray gun having one or more of the aforementioned characteristics, and / or a paint spray gun having one or more of the aforementioned material quantity regulating devices. According to the method, the material quantity regulating device is set to a stroke-limited position by means of an adjusting element, in which a stop surface allows the material needle to move in an axial direction to a freely definable intermediate position in which a reduced material quantity can be output. Subsequently, a coating material layer is applied with a reduced material output. After the coating material layer is completely applied, a quick adjustment mechanism of the material quantity regulating device is operated, by means of which the stop surface is transferred from the stroke-limited position to a stroke-opening position without operating the adjusting element, wherein in the stroke-opening position, the material needle can be opened in the axial direction to a maximum position and the maximum feasible (unreduced) or slightly reduced material quantity can be output. Subsequently, another coating material layer is applied with an unreduced material output. For example, the described method can be used to achieve special surface effects. It is also possible to produce a coating material layer that is specially covered. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] An embodiment of the device according to the invention is explained in more detail below based on a schematic diagram. Here it is shown:

[0045] Figure 1 A perspective view showing a first embodiment of a material quantity regulating device in a stroke-limiting position,

[0046] Figure 2 Shown in travel limit position Figure 1 A partial sectional view of a first design of a material quantity regulating device in FIG.

[0047] Figure 3 Shown in travel limit position Figure 1 A central sectional view of a first embodiment of the material quantity regulating device in FIG.

[0048] Figure 4 Shown in the open travel position Figure 1 A central sectional view of a first embodiment of the material quantity regulating device in FIG.

[0049] Figure 5 Shown with the Figure 1 A paint spray gun according to a first embodiment of a material quantity regulating device,

[0050] Figure 6 Shown with the Figure 1 The first design of the material quantity regulating device in Figure 5 A partial cross-sectional view of a paint spray gun in which the trigger is not operated,

[0051] Figure 7 Shown with the Figure 1 The first design of the material quantity regulating device in Figure 5 A partial cross-sectional view of a paint spray gun with the trigger fully operated,

[0052] Figure 8 Shown with the Figure 1 The first design of the material quantity regulating device in Figure 5 A partial cross-sectional view of a paint spray gun with the trigger fully operated,

[0053] Fig. 9 Show Figure 6 Central section view of the spray gun in

[0054] Fig.10 A central sectional view showing a second embodiment of the material quantity regulating device in the stroke-limiting position,

[0055] Fig.11 A central sectional view showing a second embodiment of the material quantity regulating device in the stroke open position,

[0056] Fig.12 A central sectional view showing a third embodiment of the material quantity regulating device in the stroke-limiting position,

[0057] Fig.13 A central sectional view showing a third embodiment of the material quantity regulating device in the stroke open position,

[0058] Fig.14 A central sectional view of a fourth embodiment of the material quantity regulating device in a stroke-limiting position,

[0059] Fig.15 A central sectional view of a fourth embodiment of the material quantity regulating device in the stroke open position,

[0060] Fig.16 A side view of a fourth embodiment of the material quantity regulating device is shown in the open stroke position. DETAILED DESCRIPTION

[0061] Figures 1 to 4 A material quantity regulating device 1 for limiting the material needle stroke of a hand-held paint spray gun 3 is shown, as shown in FIG. Figure 5 The material quantity regulating device 1 has a front end 4, which has a holding means 5 in the form of a thread 14, by means of which the material quantity regulating device 1 can be fixed in place. Figure 5 In the figure, the paint spray gun 3 is shown. In addition, the rear end 6 opposite to the front end 4 is shown. The material quantity regulating device 1 has the following Figures 2 to 4 Shown are the stop surface 7 for limiting the stroke of the material needle and the adjustment mechanism 8 formed by a part of the holding mechanism 5 designed in the form of a thread 14 .

[0062] By means of the adjustment mechanism 8 and the interaction with the corresponding mating element 9 of the paint spray gun 3, the axial position of the stop surface 7 can be adjusted to limit the material needle stroke. A quick adjustment mechanism 10 is also shown, by which the stop surface 7 can be reciprocated relative to the adjustment mechanism 8 in the axial direction 13 between a stroke limiting position and a stroke opening position different from the stroke limiting position without changing the position of the adjustment mechanism 8 and without removing the material quantity adjustment device 1 from the paint spray gun 3.

[0063] In the material quantity regulating device 1 shown, the stop surface 7 is arranged offset in the axial direction 13 relative to the holding device 5 in the direction of the rear end 6 of the material quantity regulating device 1. Here, the stop surface 7 is closer to the front end 4 of the material quantity regulating device 1 in the stroke-limited position than in the stroke-released position.

[0064] As from Figures 1 to 4 As can be seen in the figure, the adjustment mechanism 8 extends at the front end 4 in the direction of the rear end 6. The stop surface 7 for limiting the stroke of the material needle can be reciprocated between a stroke limiting position and a stroke opening position different from the stroke limiting position in the axial direction 13 by a quick adjustment mechanism 10 separated from the adjustment mechanism 8. With the help of the quick adjustment mechanism 10, the stop surface 7 can be adjusted relative to the adjustment mechanism 8, wherein in the stroke limiting position, the stop surface 7 is arranged offset relative to the adjustment mechanism 8 in the axial direction 13 in the direction of the rear end 6 of the material quantity adjustment device 1.

[0065] As shown in the structure of the material quantity regulating device 1, the stop surface 7 is also arranged in the stroke limiting position offset relative to the adjustment mechanism 8 in the direction of the rear end 6 of the material quantity regulating device 1. Therefore, whether in the stroke limiting position or in the stroke opening position, the stop surface 7 is arranged closer to the rear end 6 of the material quantity regulating device 1 than to the front end 4. In an alternative design, when the material quantity regulating device 1 is in the stroke limiting position, the stop surface 7 can also be arranged at the height of the adjustment mechanism 8 in the axial direction 13.

[0066] As from Figures 1 to 4 It can be seen that a locking mechanism 17 is provided, by means of which the adjustment mechanism 8 can be locked in a position in the axial direction 13 , wherein the locking mechanism 17 is designed as a lock nut 17 .

[0067] Figures 1 to 4 Likewise shown is a cavity 15 which extends from the front end 4 of the material quantity regulating device 1 in the direction of the rear end 6 of the material quantity regulating device 1 into the interior of the material quantity regulating device 1. Figures 6 to 9 It can be seen that the cavity 15 is designed to accommodate a material needle 16 of the paint spray gun 3 .

[0068] Also shown are a sleeve-shaped adjusting element 18, which comprises the adjusting mechanism 8, and a sleeve-shaped stop element 19, which comprises the stop surface 7, wherein the stop element 19 is arranged partially in the interior of the adjusting element 18. Designs are also possible in which the adjusting element 18 is arranged at least partially in the interior of the stop element 19.

[0069] Figure 3 The material quantity adjustment device is shown in a stroke-limiting position, and Figure 4The material quantity regulating device is shown in the stroke-opening position. It can be seen from the two figures that the stop surface 7 is closer to the front end 4 of the material quantity regulating device 1 in the stroke-limiting position than in the stroke-opening position in the axial direction 13, and that, in the stroke-limiting position, the stop surface 7 is positioned within the half of the material quantity regulating device 1 including the rear end 6 of the material quantity regulating device 1.

[0070] It is also shown that the stop element 19 and the adjustment element 18 each have shoulders 27, 29, which in the open stroke position abut against each other and limit the maximum deflection of the stop element 19 in the open stroke position to the rear. It can be seen from the illustrated structure that the adjustment of the stop surface 7 by means of the quick adjustment mechanism 10 is only carried out with a movement of the stop surface 7 in the axial direction 13. In the case of, for example, Fig.10 and 11 In another design of the present invention shown in Figures 12 and 13 or 14 and 15, the adjustment of the stop surface 7 by means of the adjustment mechanism 8 can also be carried out by a rotational movement of the operating element 21 around the central axis of the material quantity adjustment device 1 or by a combination of this rotational movement and the previously described movement along the axial direction 13.

[0071] Especially from Figure 3 and Figure 4 It is concluded that the quick adjustment mechanism 10 is designed so that it is locked autonomously in the stroke limiting position and the stroke opening position. For this purpose, the quick adjustment mechanism 10 has a protective element 22, which is used to lock the quick adjustment mechanism 10 in the stroke limiting position and the stroke opening position, wherein the protective element 22 partially surrounds the adjustment element 18 and the stop element 19 in the circumferential direction. The quick adjustment mechanism 10 is designed so that it is automatically adjusted from the stroke limiting position to the stroke opening position by retracting the protective element 22. For this purpose, a spring element 37 is provided, which, when the quick adjustment mechanism 10 is released via the protective element 22, cooperates with the material needle spring 47 to apply a backward-directed force to the stop element 19 and moves the stop element in the backward direction. For this purpose, the protective element 22 is pulled backward in the stroke limiting position.

[0072] like Figure 3 and Figure 4 As shown, the adjusting element 18 is sleeve-shaped, wherein a stop element 19 is provided which is arranged partially inside the adjusting element 18 and is coaxially supported on the inner surface 30 of the sleeve-shaped adjusting element 18. Figure 1 and Figure 2The outer thread 14 is shown in detail, which holds the travel retaining means 5 and the adjusting means 8. A locking means 17 in the form of a lock nut 17 is provided on the outer thread 14. The stop element 19 is closed at the end 23 opposite the front end 4 of the material quantity regulating device 1. The stop surface 7 is formed on the inner side 24 of the closed end 23. In the region of the open end 25 of the stop element 19 opposite the closed end 23, the outer side 26 of the stop element 19 is provided with a shoulder 27. Figure 4 In the shown stroke-released position, the shoulder 27 abuts against a shoulder 29 on the inner face 30 of the adjusting element 18 and blocks a movement of the stop element 19 in the axial direction 13. In the stroke-released position, the internal stop element 19 is moved maximally in the direction of the rear end 6 of the material quantity adjusting device 1.

[0073] The stop element 19 has a circumferential groove 31 in the region of the closed end 23. The adjustment element 18 has a bore 32 in the rear region, in which a ball 33 is supported so as to be movable only radially relative to the axial direction 13. Figure 3 In the protection position shown in FIG. 1 , the position of the bore 32 in the axial direction 13 is at the same height as the position of the circumferential groove 31 , wherein the stop element 19 is moved in the adjusting element 18 toward the front end 4 .

[0074] Furthermore, a sleeve-shaped protective element 22 is shown, which surrounds the region of the rear end 6 of the material quantity regulating device 1 in the region of the bore 32 and the surrounding groove 31. The protective element 22 has a larger open inner diameter 35 arranged upstream in the axial direction 13 and a smaller protective inner diameter 36 arranged downstream in the axial direction 13. The protective element 22 is mounted in a manner that it can move relative to the adjusting element 18 and the stop element 19 in the axial direction 13, so that it can be moved in the axial direction 13. Figure 3 The protection position and Figure 4 , and reciprocates between the open positions shown in FIG.

[0075] In accordance with Figure 3 In the protective position, the surrounding groove 31, the bore 32 and the protective inner diameter 36 are at the same height in the axial direction 13. Figure 4 In the open position in FIG. 1 , the circumferential groove 31 , the bore 32 and the open inner diameter 35 are at the same height in the axial direction 13 .

[0076] In accordance with Figure 3 In the protective position, the ball 33 engages in the circumferential groove 31 of the stop element 19, wherein the mobility of the ball 33 in the radial direction and away from the center axis of the material quantity adjustment device 1 is limited by the smaller protective inner diameter 36, so that the ball remains engaged in the circumferential groove 31. As a result, axial mobility of the stop element 19 relative to the adjustment element 18 is prevented.

[0077] In accordance with Figure 4 In the open position, the ball 33 can be deflected radially outward from the center axis of the material quantity regulating device 1 due to the larger open inner diameter 35, so that the ball 33 no longer engages in the surrounding groove 31. Therefore, the stop element 19 can be reciprocated relative to the adjustment element 18 in the axial direction 13 between the stroke limiting position and the stroke opening position.

[0078] A spring element 37 is provided between the stop element 19 and the protective element 22, which applies a force to the stop element 19 in the axial direction 13 and in the direction of the rear end 6 of the material quantity regulating device 1, which automatically moves the stop element 19 backwards from the stroke-limiting position into the stroke-releasing position and holds it in said position.

[0079] On the other hand, the spring element 37 exerts a force on the protective element 22 in the axial direction 13 and in the direction of the front end 4 of the material quantity regulating device 1, which forces the protective element 22 forward in the direction of the protective position. However, the protective element 22 is held in the open position by the ball 33 arranged in the open inner diameter 35 of the protective element 22.

[0080] In order to remove the stop surface 7 or the stop element 19 from Figure 4 The stroke open position shown in the Figure 3 In the stroke limit position shown in FIG, the push button 38 on the stop element 19 must be actuated and the stop element 19 must be moved toward the front end 4 so that the groove 31 is again at the axial height of the ball 33. The ball 33 is now pressed radially inwards into the groove 31. The unlocked protective element 22 is now moved toward the front end 4 by the spring element 37 and the quick-release mechanism 10 locks itself autonomously in the position. Figure 3 In the stroke-limited position shown, the outward radial movement of the ball 33 is limited by the guard inner diameter 36 of the guard element 22 which is located at the height of the ball 33 .

[0081] In order to remove the stop surface 7 or the stop element 19 from Figure 3 The travel limit position shown in Figure 4In the stroke open position shown in FIG, the protective element 22 is moved toward the rear end 6 of the material quantity adjusting device 1, wherein the spring element 37 is further compressed and the spring force applied by the spring element 37 to the stop element 19 via the button 38 is increased. Once the protective element 22 is displaced toward the rear end 6 of the material quantity adjusting device 1 so that the open inner diameter 35 and the ball 33 are at the same axial height, the ball 33 is moved outward in the axial direction by the spring force, whereby the stop element 19 is released and moves backward autonomously. As long as no forward-directed force is applied to the button 38 as described above, the spring force applied to the button 38 and thus to the stop element 19 via the spring element 37 keeps the stop element 19 in the stroke open position.

[0082] Figure 5 A spray gun 3 for dispensing coating material is shown by way of example. The spray gun shown is a hand-held spray gun 3 having Fig. 9 The material needle 16 shown in the cross-sectional view and according to Figures 1 to 4 A material quantity regulating device 1 for limiting the material needle stroke. The material quantity regulating device 1 is directly fixed to the paint spray gun 3, but in an alternative design, it can also be fixed via at least one intermediate component.

[0083] Figures 6 to 8 The paint spray gun 3 is shown in different material delivery states. Figure 6 The output is in a state where the material needle 16 is not opened and no coating material is output. Figure 7 and Figure 8 The state when the trigger 45 is fully pulled is shown, wherein Figure 7 The material quantity regulating device 1 is in the stroke limiting position and Figure 8 The medium material quantity regulating device 1 is in the stroke open position.

[0084] from Figure 7 It can be seen that in the stroke-limited position, the stop surface 7 limits the maximum axial deflection of the material needle 16 in the direction of the rear end 6 of the material quantity regulating device 1, so that a reduced amount of coating material can be output compared to the stroke-opening position. Figure 8 becomes particularly evident in the overview of Figure 8 The material quantity control device 1 is shown in the open stroke position. Here, it is shown that the material needle 16 is further displaced backwards in the open stroke position, whereby the material nozzle 54 can be opened further and thus a greater amount of coating material can be discharged, since the opening cross section between the material nozzle 54 and the material needle 16 is larger. Figure 8It is also shown that in the stroke-released position, the maximum deflection of the material needle 16 in the axial direction 13 and in the direction of the rear end 6 of the material quantity regulating device 1 is limited by the stop surface 7, so that the maximum possible coating material quantity can be discharged. However, in another embodiment, the deflection of the material needle 16 can also be limited by the stop surface 7, wherein the limitation of the deflection of the material needle 16 in the stroke-released position is nevertheless smaller than in the stroke-limited position.

[0085] The application of coating material by means of the paint spray gun 3 is preferably started by first transferring the material quantity regulator 1 into a closed position (not shown) in which the material quantity regulator 1 is completely closed by means of the adjusting element 18. In this position, the stop surface 7 of the material quantity regulator 1 completely blocks the movement of the material needle 16 of the paint spray gun 3 in the axial direction 13 (zero position or starting position).

[0086] Subsequently, the material quantity regulating device 1 is set by means of the adjusting element 18, for example Figure 4 In the stroke limit position shown in FIG. 1 , the stop surface 7 allows the material needle 16 to move in the axial direction 13 until Figure 7 In the intermediate position shown in FIG. 1 , a reduced amount of material can be discharged.

[0087] Subsequently, the quick adjustment mechanism 10 of the material quantity adjustment device 1 is operated, by means of which the stop surface 7 is transferred from the stroke limiting position to the Figure 4 In the stroke open position shown in FIG. 1 , the adjusting element 18 can be operated without actuating the adjusting element 18 . Figure 8 In FIG. 1 , the material needle 16 is shown opened in the axial direction 13 up to a maximum position and can dispense an unreduced amount of material.

[0088] After the rapid adjustment mechanism 10 has been actuated and the material quantity regulating device 1 has been placed in the open stroke position, the lower coating material layer with the unreduced material output quantity is now applied to the object to be coated.

[0089] Subsequently, the quick-release adjustment mechanism 10 is actuated again, whereby the stop surface 7 is transferred back into the stroke-limiting position without actuating the adjusting element 18 , wherein a reduced amount of material can now be dispensed.

[0090] After the rapid adjustment mechanism 10 has been actuated and the material quantity regulating device 1 has thus been placed in the stroke-limiting position, the upper coating material layer is now applied to the object with a reduced material output.

[0091] In an alternative design, the coating material is applied by means of the paint spray gun 3 in such a way that first a lower (first) coating material layer is applied with a reduced material output by means of the material quantity regulating device 1 in the stroke-limited position, and then a further coating material layer is applied to the first coating material layer with the maximum possible material output by means of the material quantity regulating device 1 in the stroke-released position.

[0092] Fig. 9 Show Figures 5 to 8 A central sectional view of a paint spray gun in which the material quantity regulating device 1 is in Figure 3 In the stroke limit position shown in . The paint spray gun 3 has a coating agent inlet 41, at which a material supply device can be installed, which supplies coating material to the paint spray gun 3. In the paint spray gun 3 shown, a flow cup can be installed at the coating agent inlet 41. An air valve 42 is also shown, by means of which the air flow through the paint spray gun 3 can be controlled. For this purpose, an air supply interface 43 is provided to supply compressed air to the paint spray gun 3. The paint spray gun 3 also has a gun handle 44, at which the paint spray gun 3 can be held by the user. In addition, a trigger 45 is provided, by means of which the deflection of the air valve 42 and the material needle 16 is controlled, thereby controlling the material output. An air quantity regulating device 46 is also shown, by means of which the compressed air quantity reaching the air valve 42 from the air supply interface 43 can be set. By means of a material needle spring 47, a spring force is applied to the material needle 16 in the material output direction so that when the trigger 45 is released, the material needle continues to move forward. Also shown is an air nozzle 53, which surrounds a likewise shown circular material nozzle 54 in the form of an annular gap and atomizes the coating material exiting the material nozzle 54. Both the material nozzle 54 and the air nozzle 53 are located at a nozzle head 55. An angle 57 extending in the material discharge direction is also provided at the nozzle head 55, which carries an angle air nozzle 58. By means of a round / wide jet adjustment device 56, it is possible to control how much air flows out at the angle air nozzle 58 when the trigger 45 is actuated.

[0093] Figures 10 to 16 An alternative embodiment of the material quantity regulating device 1 according to the invention is shown. However, many other embodiments are conceivable and are also considered to be in accordance with the invention.

[0094] Fig.10 and Fig.11 A second design of the material quantity regulating device 1 is shown. In contrast to the previous design, the stop element 19 has a quick adjustment mechanism 10, which is formed by a first quick thread 48 and a second quick thread 49. Here, the first quick thread 48 is longer than the second quick thread 49. If the quick adjustment mechanism is in Fig.10 In the stroke limiting position shown in FIG, the stop element 19 is connected to the adjusting element 18 by means of the shorter second quick thread 49. If the quick adjustment mechanism 10 is switched to the stroke opening position, the stop element 19 is screwed out of the adjusting element 18 by means of the second quick thread 49, and then the stop element 19 is screwed onto the thread on the adjusting element 18 by means of the first quick thread 48. Due to the different lengths of the first quick thread 48 and the second quick thread 49, the stop surface 7 is further away from the front end 4 of the material quantity adjusting device 1 in the stroke opening position than in the stroke limiting position.

[0095] Fig.12 and Fig.13 Another design of the material quantity regulating device 1 is shown, which differs from the previously described design in that the stop element 19 and the adjusting element 18 are connected via a threaded knob 50, which carries an external thread 60 at its front end, by means of which the threaded knob 50 is connected to the adjusting element 18, so that the threaded knob 50 can be displaced forward or backward relative to the adjusting element 18 via the thread 60 when rotating about its own axis. The threaded knob 50 has an inner bore 61 at its front end, in which the stop element 19 can rotate freely, but is supported in a form-fitting manner in the axial direction, so that when the threaded knob 50 is rotated to the right or to the left in the circumferential direction, the stop element 19 together with the threaded knob 50 moves forward and backward relative to the adjusting element 18. In this way, the stop surface 7 at the stop element 19 can be moved relative to the adjusting element 18 from a stroke limiting position ( Fig.12 ) to the stroke open position ( Fig.13 )middle.

[0096] Figures 14 to 16 Another design of the material quantity regulating device 1 is shown. In the design, as from Fig.16 It can be seen that the cross section of a part of the stop element 19 is designed essentially as a triangle, so that the side surfaces of the triangular part form a retraction offset 52. At the front end of the retraction offset 52, the triangular cross section transitions into a circular cross section, the outer diameter of which is located at the corner points of the triangular cross section. The transition between the triangular cross section and the circular cross section forms a retraction offset shoulder 59 at the side of the triangle. In addition, a centrally supported protective element 22 with a hook 51 is provided, which is designed so that when the angular positions of the retraction offset shoulder 59 and the hook 51 relative to the axis of the material quantity regulating device 1 coincide, in this way, even if the material needle 16 or possibly the material needle spring 47 is pressed directly onto the stop element 19 in the axial direction 13, the stop element 19 is also held in the stroke limiting position.

[0097] In order to transfer the stop element 19 to the stroke-release position ( Fig.15), the stop element 19 is rotated about its own axis until the hook 51 is displaced outwardly so that it is located on the circular outer diameter of the stop element 19 and is out of engagement with the retraction offset shoulder 59. The force applied directly to the stop element 19 by the material needle 16 or the material needle spring 47 then transfers the stop element into the stroke-opening position.

[0098] If a force is applied to the rear end 6 of the material quantity regulating device 1, the stop element 19 can be further displaced forward and stabilized in the stroke limiting position by rotating about its own axis. As in the abandoned design example, the material quantity regulating device 1 can have a position marking 40, which indicates the angular position of the material quantity regulating device 1 relative to the paint spray gun.

[0099] The preferred embodiments of the present invention are described only by way of example according to the accompanying drawings and the above-mentioned embodiments. Other constructions, materials or connection types can be considered, and it is obvious to a person skilled in the art after reading the embodiments and the prior art that other constructions, materials or connection types can be considered. Even if not explicitly mentioned, all individual features of the embodiments can be combined with each other. This also applies to the embodiments themselves. A person skilled in the art clearly recognizes when a combination is not feasible or does not make sense. All designs can be applied to different types of paint spray guns, even if this is not explicitly described.

[0100] Reference Numbers List

[0101] 1. Material quantity adjustment device

[0102] 3. Paint spray gun

[0103] 4. Front end (of material quantity adjustment)

[0104] 5. Holding mechanism (for material quantity adjustment)

[0105] 6. Backend (of material quantity adjustment)

[0106] 7. Stop surface

[0107] 8. Adjustment mechanism (for material quantity adjustment)

[0108] 9. Matching components for paint spray guns

[0109] 10. Quick adjustment mechanism

[0110] 13. Axial direction

[0111] 14. Thread

[0112] 15. Cavity

[0113] 16.Material needle

[0114] 17. Locking mechanism

[0115] 18.Regulator

[0116] 19. Stop element

[0117] 21. Operating element (for rotational movement)

[0118] 22. Protective elements

[0119] 23. Closed end of the stop element

[0120] 24. The inside of the closed end of the stop element

[0121] 25. Open end of the stop element

[0122] 26. Outside of the stopper element

[0123] 27. Shoulder of stop element

[0124] 29. Adjust the shoulder of the component

[0125] 30. Adjust the inner surface of the component

[0126] 31. Surrounding groove

[0127] 32. Drilling

[0128] 33. Ball

[0129] 35. Open inner diameter

[0130] 36. Protection inner diameter

[0131] 37. Spring element

[0132] 38. Buttons

[0133] 39.Connecting screws

[0134] 40. Location Marker

[0135] 41. Coating agent inlet

[0136] 42. Air valve

[0137] 43. Air supply interface

[0138] 44. Gun handle

[0139] 45. Trigger

[0140] 46. ​​Air volume setting device

[0141] 47.Material Needle Spring

[0142] 48.First Quick Thread

[0143] 49. Second quick thread

[0144] 50.Threaded button

[0145] 51. Hook

[0146] 52. Retract offset

[0147] 53. Air nozzle

[0148] 54.Material Nozzle

[0149] 55. Nozzle head

[0150] 56. Round / wide jet adjustment device

[0151] 57. Angle

[0152] 58.Angle air nozzle

[0153] 59. Retract offset shoulder

[0154] 60. External thread at the thread button

[0155] 61. Internal drilling holes at threaded buttons.

Claims

1. A material quantity regulating device (1) for limiting the stroke of a material needle of a paint spray gun (3), the paint spray gun being in particular a hand-held paint spray gun (3), the material quantity regulating device comprising: a front end (4), the front end having a retaining mechanism (5), the retaining mechanism being in particular in the form of a thread (14), the material quantity regulating device (1) being able to be fixed to the paint spray gun (3) by means of the retaining mechanism; a rear end (6), the rear end being opposite to the front end (4); a stop surface (7), the stop surface being used to limit the stroke of the material needle (2); an adjusting mechanism (8), the adjusting mechanism being in particular composed of the retaining mechanism (5) designed in the form of a thread (14) ), the stop surface (7) can be adjusted relative to the paint spray gun (3) in an axial position in a manner that interacts with a corresponding mating element (9) of the paint spray gun (3) to limit the material needle stroke via the adjustment mechanism; and a quick adjustment mechanism (10), by means of which the stop surface (7) can be reciprocated relative to the adjustment mechanism (8) along an axial direction (13) between a stroke limiting position and a stroke opening position different from the stroke limiting position without changing the setting of the adjustment mechanism (8) and without removing the material quantity adjustment device (1) from the paint spray gun (3), characterized in that At least in the stroke limiting position, the stop surface (7) is arranged at the height of the retaining mechanism (5) in the axial direction (13), or the stop surface is arranged in the axial direction (13) to be offset relative to the retaining mechanism (5) in the direction of the rear end (6) of the material quantity regulating device (1).

2. A material quantity regulating device (1) for limiting the stroke of a material needle of a paint spray gun (3), the paint spray gun, in particular a hand-held paint spray gun (3), comprising: a front end (4), a rear end (6) opposite to the front end (4), a holding mechanism (5) and an adjustment mechanism (8) at the front end (4), a stop surface (7) for limiting the stroke of the material needle, and a quick adjustment mechanism (10) separate from the adjustment mechanism (8), by means of which the stop surface (7) can be reciprocated relative to the holding mechanism (5) and relative to the adjustment mechanism (8) in an axial direction (13) between a stroke limiting position and a stroke opening position different from the stroke limiting position, characterized in that: At least in the stroke limiting position, the stop surface (7) is arranged at the height of the retaining mechanism (5) in the axial direction (13), or the stop surface is arranged in the axial direction (13) to be offset relative to the retaining mechanism (5) in the direction of the rear end (6) of the material quantity regulating device (1).

3. The material quantity regulating device (1) according to claim 1 or 2, characterized in that: The stop surface (7) is arranged at the height of the adjustment mechanism (8) at least at the stroke limiting position or is arranged to be offset relative to the adjustment mechanism (8) in the direction of the rear end (6) of the material quantity adjustment device (1), and the stop surface is preferably arranged closer to the rear end (6) than at the front end (4) of the material quantity adjustment device (1).

4. Material quantity regulating device (1) according to any of the preceding claims, characterized in that The material quantity regulating device (1) has a cavity (15), which extends from the front end (4) of the material quantity regulating device (1) in the direction of the rear end (6) of the material quantity regulating device (1) into the interior of the material quantity regulating device (1), and the cavity is designed to accommodate a material needle (16) of the paint spray gun (3).

5. Material quantity regulating device (1) according to any one of the preceding claims, characterized in that The stop surface (7) is closer to the front end (4) of the material quantity regulating device (1) in the stroke limiting position along the axial direction (13) than in the stroke opening position (12), wherein preferably, the stop surface (7) is positioned within a half of the material quantity regulating device (1) at the stroke limiting position, the half including the rear end (6) of the material quantity regulating device (1).

6. Material quantity regulating device (1) according to any of the preceding claims, characterized in that A locking mechanism (17) is provided, by means of which the material quantity regulating device (1) can be locked in an axial direction (13) relative to the paint spray gun (3) in a position set by the adjustment mechanism (8), wherein the locking mechanism (17) is preferably designed as a lock nut (17).

7. Material quantity regulating device (1) according to any of the preceding claims, characterized in that An adjusting element (18), in particular a sleeve-shaped adjusting element (18), is provided, the adjusting element comprising the adjusting mechanism (8), and a stop element (19), in particular a sleeve-shaped stop element (19), the stop element comprising the stop surface (7), wherein the stop element (19) and the adjusting element (18) are displaceable relative to each other in an axial direction (13).

8. Material quantity regulating device (1) according to any of the preceding claims, characterized in that The stop element (19) and the adjustment element (18) each have a shoulder (27, 29) which abut against one another in the stroke-opening position.

9. Material quantity regulating device (1) according to any one of the preceding claims, characterized in that The material quantity regulating device (1) is designed to adjust the stop surface (7) by means of the quick-adjusting mechanism (10), preferably only when the stop surface (7) moves in an axial direction (13), and / or to adjust the stop surface (7) by means of the adjusting mechanism (8) by a screwing movement around a center axis of the material quantity regulating device (1).

10. The material quantity regulating device (1) according to any one of the preceding claims, characterized in that The quick adjustment mechanism (10) is designed to enable the quick adjustment mechanism to be locked autonomously at the stroke limiting position and / or the stroke releasing position.

11. Material quantity regulating device (1) according to any of the preceding claims, characterized in that The quick adjustment mechanism (10) comprises a protective element (22) for locking the quick adjustment mechanism (10) in the stroke limiting position and / or the stroke opening position, wherein the protective element (22) preferably at least partially surrounds the adjustment element (18) and / or the stop element (19) in a circumferential direction.

12. Material quantity regulating device (1) according to any of the preceding claims, characterized in that The quick adjustment mechanism (10) is automatically adjusted from the stroke limiting position to the stroke opening position by the movement of the protection element (22).

13. Material quantity regulating device (1) according to any of the preceding claims, characterized in that The material quantity regulating device (1) comprises a sleeve-shaped adjusting element (18) and a sleeve-shaped stop element (19), wherein the stop element is arranged partially within the adjusting element (18) and is coaxially supported on the inner surface (30) of the sleeve-shaped adjusting element (18), wherein the adjusting element (18) is provided with an external thread (14), which forms the retaining mechanism (5) and the adjusting mechanism (8), wherein a locking mechanism (17) in the form of a lock nut (17) is provided on the external thread (14), wherein the stop element (19) is closed at an end (23) opposite the front end (4) of the material quantity regulating device (1), and the stop surface (7) is constructed at the closed end (23) on the inner side (24), wherein the outer side (26) of the stop element (19) is provided with a shoulder (27) in the region of the open end (25) of the stop element (19) opposite to the closed end (23), wherein the shoulder abuts against the shoulder (29) at the inner side (30) of the adjustment element (18) in the stroke open position and prevents the stop element (19) from moving in the axial direction (13) from the front end (4) of the material quantity regulating device (1) toward the rear end (6) of the material quantity regulating device (1), and the built-in stop element (19) is displaced to the greatest extent in the stroke open position in the direction of the rear end (6) of the material quantity regulating device (1).

14. Material quantity regulating device (1) according to any of the preceding claims, characterized in that The stop element (19) has a circumferential groove (31), and the adjustment element (18) has a bore (32), in which a ball (33) is supported in a manner that it can move radially relative to the axial direction (13), wherein a sleeve-shaped additional protective element (22) is provided, which surrounds the area of ​​the rear end (6) of the material quantity adjustment device (1) in the area of ​​the bore (32) and the circumferential groove (31), and the additional protective element has a larger opening inner diameter (35) arranged in front in the axial direction (13) and a smaller protective inner diameter (36) arranged in the axial direction (13), wherein the protective element (22) can be reciprocated in the axial direction (13) between a protective position and an open position relative to the adjustment element (18) and the stop element (19), wherein when the protective element (22) is arranged in the protective position and the stop element (19) is arranged in the stroke limiting position relative to the adjustment element (18), the circumferential groove (31) is arranged in the stroke limiting position. 31), the drill hole (32) and the protective inner diameter (36) are at the same height in the axial direction (13), so that the ball (33) is pressed radially inwardly into the groove (31) at the stop element (19) due to the protective inner diameter (36) at the protective element (22), thereby locking the stop element (19) in the stroke limiting position relative to the adjustment element (18), and wherein, when the protective element (22) is arranged in the open position, the drill hole ( The inner diameter (32) of the stop element (19) is at the same height as the ball (33) supported in the bore and the open inner diameter (35) at the protective element (22) in the axial direction (13), so that the ball (33) can move radially outward from the groove (31) at the stop element (19) into the open inner diameter (35), thereby enabling the stop element (19) to reciprocate between the stroke limiting position and the stroke opening position relative to the adjustment element (18) in the axial direction (13).

15. Material quantity regulating device (1) according to any of the preceding claims, characterized in that A spring element (37) is provided, via which the stop element (19) and the protective element (22) are supported against one another in an axial direction (13).

16. A paint spray gun (3) for dispensing coating material, the paint spray gun (3) being in particular a hand-held paint spray gun (3), the paint spray gun having a material needle (16) and a material quantity regulating device (1) according to any one of the preceding claims for limiting the stroke of the material needle, wherein: The material quantity regulating device (1) is preferably fastened to the paint spray gun (3) directly or via at least one intermediate component.

17. The paint spray gun (3) according to claim 16, characterized in that The stop surface (7) limits the maximum axial deflection of the material needle (16) in the direction of the rear end (6) of the material quantity regulating device (1) in the stroke limiting position, so that a reduced amount of coating material can be output compared to the stroke opening position, wherein preferably, the maximum deflection of the material needle (16) in the axial direction (13) and in the direction of the rear end (6) of the material quantity regulating device (1) is not limited by the stop surface (7) in the stroke opening position, so that the maximum feasible amount of coating material can be output.

18. A method for applying a coating material by means of a paint spray gun (3), in particular a paint spray gun (3) according to claim 16 or 17, comprising the following steps: a) by means of an adjusting element (18), setting the material quantity regulating device (1) to a stroke-limiting position, in which the stop surface (7) allows the material needle (16) to move in the axial direction (13) up to an intermediate position in which a reduced material quantity can be dispensed, b) operating the quick-acting adjustment mechanism (10) of the material quantity regulating device (1), by means of which the stop surface (7) is transferred from the stroke-limiting position to a stroke-opening position without operating the adjusting element (18), in which the material needle (16) can be opened in the axial direction (13) to a maximum position and the maximum possible material quantity can be discharged, c) applying the layers of cladding material at the maximum practicable material output, d) operating the quick-acting adjustment mechanism (10), by means of which the stop surface (7) is transferred back to the stroke limit position, in which a reduced amount of material can be discharged, without operating the adjusting element (18), e) Applying layers of cladding material with reduced material output.

19. A method for applying a coating material by means of a paint spray gun (3), in particular a paint spray gun (3) according to claim 16 or 17, comprising the following steps: a) by means of an adjusting element (18), setting the material quantity regulating device (1) to a stroke-limiting position, in which the stop surface (7) allows the material needle (16) to move in the axial direction (13) up to an intermediate position in which a reduced material quantity can be dispensed, b) applying layers of cladding material with reduced material output, c) operating the quick-acting adjustment mechanism (10) of the material quantity regulating device (1), by means of which the stop surface (7) is transferred from the stroke-limiting position to the stroke-opening position without operating the adjusting element (18), in which the material needle (16) can be opened in the axial direction (13) to a maximum position and the maximum possible material quantity can be discharged, d) Applying layers of cladding material at the maximum practicable material output.

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