JP4796773B2 - Spray gun for painting - Google Patents

Description

  The present invention relates to a spray gun for coating, and more particularly to an airless gun, and more particularly to a spray gun for coating that is suitable when using low-speed, low-pressure air supplied by a blower.

When an air compressor is used as an air supply source for a spray gun for painting, a very high pressure air of 200 to 300 kPa is introduced into the spray gun for painting. Even if a pressure loss occurs, there is no problem in spraying and spraying the paint.
However, when an air compressor is used, the paint is ejected vigorously with the air, causing the paint to scatter to the surroundings and to be contaminated by rebounding from the surface to be coated, which has been a problem including the effects on the surrounding environment. .
Therefore, recently, a blower that supplies air at a lower speed and lower pressure than compressed air supplied from an air compressor is used as an air supply source in order to prevent the paint from scattering and splashing, or the compressed air is used under reduced pressure. is doing.

FIG. 11 is a side sectional view showing an example of the overall configuration of a conventional low pressure, large capacity type spray gun 201 for coating. In the illustrated spray gun 201 for painting, the air A introduced into the grip part 203 is guided from the lower part of the gun body 205 through the inside of the gun body 205 to the upper part of the gun body 205 and formed above the gun body 205. It passes through the bent air conveyance flow path 207 and reaches the main injection port 213 and the pattern adjustment injection port 215 in the vicinity of the outside of the discharge port 211 of the nozzle 209 provided at the front end of the gun body 205.
However, when a blower is used, the pressure loss of air A caused by the air conveyance flow path 207 bent due to the lack of air pressure, and the deviation of air A around the main injection port 213 and the pattern adjustment injection port 215 appear remarkably. The desired paint cannot be atomized and ejected.

  The present invention has been made in view of the above-mentioned background art and the existence of problems that the background art has, and is capable of atomizing a desired paint even in an environment using low-speed, low-pressure air. It is an object of the present invention to provide a spray gun for painting that has very little air pressure loss and air bias that allows ejection.

In order to solve the above-mentioned problem, the invention described in claim 1 is configured to bring the paint in the paint cup into the nozzle tip by rotating the trigger lever, and at a predetermined pressure and a predetermined flow rate from the outside of the nozzle toward the nozzle tip. in painting spray gun hand gun type which atomizes the supplied paint inside the nozzle tip ejection by supplying air, the painting spray gun paint inflows to bring the paint within the paint cup inside the gun body A paint flow path composed of a passage and a paint transport flow path for transporting paint that has flowed into the gun body into the nozzle tip, and air that causes a predetermined pressure and flow rate of air supplied from the outside to reach the gun body. An air flow path comprising an introduction flow path and an air conveyance flow path for conveying the air introduced into the gun body to the outside of the nozzle tip, and Serial air conveying passage, toward the nozzle tip from the branch point of the parallel air intake passages on the paint delivery flow path formed linearly, the trigger lever, the side body portion above the gun body A lever arm having a pivot fulcrum, loosely fitted to both ends of the pivot fulcrum, and extending in a U-shape when viewed from the front so as to wrap the side barrel of the gun body, and a lower end of the lever arm And a lever operating part extended downward, and a part of the lever arm is a pin pushing part bent into an inner flange, and the pin pushing part and the air conveying flow A connecting pin is provided in parallel with the air valve loaded in the passage so as to sandwich the side body portion of the gun body, so that the side of the gun body can be crossed without crossing the air conveyance flow path. Provided outside so as to sandwich the torso It is a paint spray gun, characterized in that.

According to a third aspect of the present invention, in the spray gun for coating according to the first or second aspect , the air transport channel is guided to the outside of the nozzle tip without being biased around it so as to cover the paint transport channel. And a pattern adjustment flow path that is arranged symmetrically with respect to the paint transport flow path that diverges from the main flow path and then jets air toward the extension line outside the nozzle tip to adjust the air injection pattern. It is the spray gun for painting characterized by being constituted.

According to a second aspect of the present invention, in the spray gun for painting according to the first aspect , the connecting pin is provided so as to sandwich the left and right side body parts of the gun body, and is normally an air valve return spring. The air valve receives the urging force from the air valve and protrudes toward the tip of the nozzle. By pulling the trigger lever, the air valve is pressed against the urging force of the air valve return spring to press the air introduction flow path and the air. A spray gun for painting, characterized in that it moves in a direction that communicates with a transport channel.

According to the spray gun for painting of the present invention, the air introduced into the air introduction channel is guided into the air conveyance channel without being subjected to pressure loss, and is supplied to the outside of the nozzle tip. Therefore, the atomization and ejection failure of the paint due to the pressure drop are prevented, and good coating is performed even when a blower with a low air flow rate and low air pressure is used.
In addition, the main air flow path is parallel to the paint transport flow path and is formed without any bias around it, and the pattern adjustment flow path branched from the main flow path is also arranged symmetrically with respect to the paint transport flow path. Therefore, the unevenness of air generated around the main injection port and the pattern adjustment injection port is prevented, and the desired paint can be atomized and sprayed.

In addition, a trigger lever is provided on the outside of the gun body so as to sandwich the side barrel of the gun body, and a contact pin is provided to transmit the movement of the trigger lever to the air valve. It is possible to form an air conveyance channel without narrowing the opening diameter.
In addition, the use of a contact pin enables a layout in which the pivot point of the trigger lever is installed above the gun body, which allows a relatively small stroke without increasing the pivot angle of the trigger lever more than necessary. Since the needle valve and air valve can be opened and closed, the operability of the spray gun for painting is improved.

  Hereinafter, the spray gun for painting according to the present invention will be described in detail with reference to the first embodiment shown in FIGS. The spray gun for painting shown in the first embodiment is of a low pressure and large capacity type. That is, it is a spray gun for coating with an air pressure of 20 to 50 kPa and an air discharge amount of 300 to 3000 L / min.

  The spray gun 1 for painting according to the present embodiment conveys the paint P in the paint cup 5 by rotating the trigger lever 3 to reach the inside of the tip of the nozzle 7 and from the outside of the nozzle 7 to the tip of the nozzle 7. A hand gun type spray gun for spraying the paint P supplied to the inside of the tip of the nozzle 7 by supplying air A at a predetermined pressure and flow rate toward the nozzle A and forming a predetermined spray pattern together with the air A It is.

The spray gun 1 for painting includes a gun body 9 that extends in the horizontal direction, a grip portion 11 that extends obliquely downward and rearward from a portion near the lower rear of the gun body 9, and a side of the gun body 9 in front of the base end portion of the grip portion 11. A trigger lever 3 having a rotation fulcrum 15 is provided above the trunk portion 13 so as to straddle the trunk portion 13.
The grip portion 11 has a grip core material 17 at the center, and is configured by providing a grip cover 19 around the grip core material 17 so as to cover the grip core material 17.

  The grip core member 17 is formed of a metal circular tube or the like, and male screw portions 23 for screwing and connecting to the gun body 9 and the hose joint 21 are formed at both ends thereof. In addition, the internal space of the grip core member 17 is an air introduction passage 25 that allows air A supplied by an external blower (not shown) to reach the inside of the gun body 9.

The gun body 9 is provided with a nozzle 7 at the tip, a cup attachment position adjustment attachment 31 provided in the front where the paint cup 5 is attached, and a body base 33 provided in the rear where the grip 11 and the trigger lever 3 are connected. And.
The cup attachment position adjusting attachment 31 is a member having a substantially cylindrical shape, and a male screw portion 35 is engraved on the outer periphery of both end portions somewhat enlarged in diameter. A cap fixing nut 37 and an attachment fixing nut 39 are screwed into the two male screw portions 35 from the outside, and an air cap 41 is attached in front of the cup attachment position adjustment attachment 31, and behind the cup attachment position adjustment attachment 31. The main body base 33 is connected to.

An engagement groove 43 that extends horizontally from the front end surface to the rear is provided on the inner periphery of the front end side of the cup attachment position adjustment attachment 31. An engagement protrusion 47 provided on a part of the outer periphery of the pattern adjustment plate 45 is fitted into the engagement groove 43 to restrict the mounting position of the pattern adjustment plate 45.
On the other hand, on the inner periphery of the rear end side of the cup attachment position adjustment attachment 31, four guide grooves 49 are provided which are equally arranged in the circumferential direction extending horizontally from the rear end surface toward the front. Of these, one guide groove 49 is selected and engaged with a guide projection 51 formed on the outer periphery of the front end portion of the main body base 33 described later.

Therefore, the cup attachment position adjustment attachment 31 can adjust the attachment position with respect to the main body base 33 by 90 ° in four steps in the circumferential direction by appropriately switching the guide groove 49 engaged with the guide protrusion 51.
A holding sleeve 55 into which the nozzle holder 53 is fitted is provided in the center of the cup attachment position adjustment attachment 31 so as to extend horizontally in the axial direction. Further, three connecting ribs 57 are provided between the inner peripheral surface of the cup attachment position adjustment attachment 31 and the holding sleeve 55 as an example for connecting the two, and the tip of the cup attachment position adjustment attachment 31 protrudes from the outer periphery of the cup attachment position adjustment attachment 31. The rear end portion of the cup mounting boss 59 provided with the portion is connected to each other.

As shown in FIG. 7, the cup mounting boss 59 is provided only at one location, but by adjusting the mounting position of the cup mounting position adjustment attachment 31 as described above, the position of the cup mounting boss 59 can be adjusted vertically and horizontally. It is possible to switch.
Accordingly, the paint cup 5 attached to the cup attachment boss 59 via the cup joint 61 can be attached not only in the vertical direction shown in FIG. 5 but also in the horizontal direction shown in FIG. 6, and the attachment of the cup attachment position adjusting attachment 31 is possible. It can be applied to various painting sites simply by adjusting the position.
Further, a screw hole 32 communicating with an air flow path 141 described later is formed in the cup attachment position adjustment attachment 31, and a bifurcated connector 34 is attached to the screw hole 32. A hose 36 is connected to the bifurcated coupler 34, and the hose 36 is connected to the paint cup 5 via a check valve 38.

The nozzle holder 53 fitted into the holding sleeve 55 is a stepped cylindrical member, and has a female thread portion formed on the inner periphery of the large diameter portion on the front end side and the small diameter portion on the rear end side. The male screw portion at the rear end portion of the nozzle 7 is screwed into this portion, and the male screw portion at the front end of the needle valve packing holder 63 is screwed into the female screw portion on the rear end side.
The nozzle 7 is a substantially cylindrical member having a diameter enough to be fitted into the nozzle holder 53, and a tip portion 65 having a tapered shape is formed at the tip thereof. In addition, a small-diameter paint P jet outlet 67 is formed at the center of the front end portion 65, and the inner peripheral portion of the nozzle holder 53 from the jet outlet 67 to the rear end portion is aligned with the tapered surface of the outer periphery of the front end portion 65. After gradually increasing the diameter, an internal space extending in parallel is formed.

Further, the inner diameter on the front end side of the cup attachment position adjusting attachment 31 is somewhat larger than the inner diameter on the rear end side, and a stepped locking portion 69 is formed between the two. The rear end of the cap return spring 71 configured by a compression coil spring having a relatively large winding diameter, the front end of which is connected to the rear surface of the pattern adjusting plate 45, is locked to the stepped locking portion 69.
The pattern adjusting plate 45 is a flat ring-shaped member, and a circular main opening 73 serving as a passage for the atomizing air A larger than the outer diameter of the nozzle 7 is formed at the center thereof.

The pattern adjustment plate 45 is provided with four circular small pattern openings 75 that serve as passages for the pattern adjustment air A at 90 ° intervals as an example in the circumferential direction. In addition, spherical projections 77 are also provided in the middle on the same circumference as these pattern openings 75 so as to project to the front side at intervals of 90 °.
Further, the engagement protrusion 47 described above is provided on the outer periphery of the pattern adjustment plate 45.

The air cap 41 provided on the front side of the pattern adjustment plate 45 is a substantially disk-shaped member having an outer diameter slightly smaller than the inner diameter of the front end portion of the cup attachment position adjustment attachment 31.
On the rear surface of the air cap 41, there are six spherical recesses 79 at positions facing the four pattern openings 75 and the four spherical projections 77 provided on the pattern adjustment plate 45, and a path for air A for pattern adjustment. Two pattern adjustment flow paths 81 are provided. The six spherical recesses 79 are arranged symmetrically with three pattern adjustment channels 81 in between, and the two pattern adjustment channels 81 are also arranged symmetrically at positions 180 ° apart so as to face each other. ing.

Therefore, by loosening the cap fixing nut 37 and rotating the air cap 41, the engagement position between the spherical protrusion 77 formed on the front surface of the pattern adjustment plate 45 and the spherical recess 79 formed on the rear surface of the air cap 41 is changed. Can be switched.
That is, the pattern adjustment injection port 91 is formed by aligning the pattern adjustment flow path 81 formed in the air cap 41 with the two opposite pattern openings 75 of the four pattern openings 75 formed in the pattern adjustment plate 45. Can be switched between the vertical direction and the horizontal direction.

When the air cap 41 is rotated, the spherical protrusion 77 formed on the front surface of the pattern adjustment plate 45 must be overcome, but the cap return spring 71 attached to the rear surface of the pattern adjustment plate 45 is compressed and deformed. That movement is possible.
If the air cap 41 rotates by a predetermined angle and the positions of the spherical protrusion 77 and the spherical recess 79 coincide, the pattern adjusting plate 45 moves forward again by the forward biasing force of the cap return spring 71 and the spherical protrusion 77. The spherical recess 79 is again engaged and maintains its engaged position.

At the center of the rear surface of the air cap 41, an atomizing channel 85 at the tip of the main channel 83 having an opening area substantially the same diameter as the main opening 73 of the pattern adjusting plate 45 is provided. The atomizing flow path 85 extends in parallel to the front surface side, then decreases in diameter to a conical taper shape, and communicates with the main injection port 87 on the front surface of the air cap 41.
Further, two jaw-shaped protrusions 89 protruding forward are provided on the front surface of the air cap 41 at positions facing each other across the main injection port 87. A pattern adjustment channel 81 communicating from the rear surface side of the air cap 41 extends inside the jaw-shaped protrusion 89, and a pattern adjustment channel is formed on the inner inclined surfaces of the two jaw-shaped protrusions 89. The pattern adjustment injection port 91 located at the tip of 81 is formed.

The main body base 33 located on the rear side of the gun main body 9 is a substantially cylindrical member, and has a reduced diameter portion fitted to the inner peripheral surface of the rear end portion of the cup attachment position adjusting attachment 31 described above at the front end portion. A stepped portion 93 is formed, and the guide protrusion 51 described above is provided on a part of the stepped portion 93.
A circlip 95 is fitted on the rear side of the stepped portion 93 to prevent the attachment fixing nut 39 from falling off from the main body base 33.

  A flat surface 97 is formed by vertically cutting the left and right side body portions 13 of the main body base portion 33 between the rear portion of the circlip 95 and the attachment portion with the grip portion 11. A guide groove 99 extending in parallel with the axial direction of the main body base 33 is formed in the center of the left and right flat surfaces 97. A part of the peripheral body portion of the connecting pin 101 shifted by the trigger lever 3 described later is fitted in the guide groove 99 to guide the movement of the connecting pin 101 in the axial direction.

A guide hole 103 extending in parallel toward the rear side is provided in the front end surface of the main body base 33 behind the flat surface 97 so as to communicate with the guide groove 99, and the rear side of the connecting pin 101 is in the guide hole 103. It is inserted.
Further, a female screw is engraved on the inner peripheral surface of the rear end portion of the main body base 33, and an air valve adjustment cap bolt 105 having a male screw portion that engages with the female screw is connected to the rear side of the main body base 33. Has been.
An internal thread is also engraved on the inner peripheral surface of the rear end portion of the air valve adjustment cap bolt 105, and the paint adjustment cap bolt 107 having an external thread portion mated with the internal thread is connected to the air valve adjustment cap bolt 105. Is further connected to the rear side.

Next, the gun body 9 thus configured, the air valve adjustment cap bolt 105 and the needle valve 109 and air valve 111 provided in the internal space of the paint adjustment cap bolt 107, and the driving force from the trigger lever 3 to be described later. Various members constituting the power transmission mechanism that operates in response to the above will be described.
The needle valve 109 is a small-diameter round bar-like member extending horizontally in the axial direction so as to penetrate the center of the gun body 9, and the front end thereof is a valve action portion 113 formed in a tapered cone shape. The needle valve packing holder 63 and the nozzle 7 are passed through the nozzle 67 formed at the tip 65 of the nozzle 7 so as to be able to appear and disappear.

An air valve 111 is provided behind the needle valve packing holder 63 so as to be in sliding contact with the inner peripheral surface of the main body base 33. The air valve 111 is externally fitted with a slide sleeve 115 that is movable in the axial direction with respect to the needle valve 109, a disc-shaped valve body 117 provided in a bowl shape at a position near the front of the slide sleeve 115, And a seal ring 121 that is fitted on the outer circumferential step portion 119 of the valve body 117.
Further, a spring receiving circumferential groove 123 recessed in a ring shape is provided on the rear surface of the valve body 117.

  An air valve return spring 125 is provided behind the air valve 111. The air valve return spring 125 is a spring that urges the air valve 111 forward. From the spring receiving circumferential groove 123 formed on the rear surface of the valve body 117 of the air valve 111 and the front end side center of the air valve adjustment cap bolt 105. A spring receiving boss 127 projecting forward is provided in a contracted state.

A through hole 129 that is considerably larger than the outer diameter of the needle valve 109 is formed at the center of the spring receiving boss 127. The through hole 129 has an enlarged diameter on the rear side, is attached to the rear end of the needle valve 109, and serves as a storage space for the needle end 133 having a flange 131 formed at the front end and the front end of the needle return spring 135.
The needle return spring 135 is a spring that urges the needle valve 109 forward, and is contracted by a flange 131 at the needle end 133 and a spring receiving boss 137 that protrudes forward from the center of the front end of the paint adjustment cap bolt 107. It is provided in the installed state.

A paint flow path 139 and an air flow path 141 are formed in the internal space of the gun body 9 and the grip portion 11 provided with the needle valve 109, the air valve 111, and peripheral members that control these operations. Yes.
The paint flow path 139 includes a paint inflow path 143 for bringing the paint P in the paint cup 5 into the cup attachment position adjustment attachment 31 in the gun body 9, and the paint P flowing into the cup attachment position adjustment attachment 31 through the nozzle 7. It is comprised from the coating material conveyance flow path 145 conveyed in the inside in the front-end | tip part 65. FIG.

The air flow path 141 includes the above-described air introduction flow path 25 that brings air A of a predetermined pressure (20 to 50 kPa as an example) supplied from a blower (not shown) provided outside to the inside of the main body base 33 in the gun main body 9. The air conveyance channel 147 conveys the air A introduced into the main body base 33 to the outside at the tip 65 of the nozzle 7.
The air transport channel 147 is formed in parallel to the paint transport channel 145 and linearly from the branch point with the air introduction channel 25 toward the tip 65 of the nozzle 7.

The air conveyance channel 147 is branched from the main channel 83 and the above-described main channel 83 which is guided to the outside of the tip portion 65 of the nozzle 7 without being biased around the paint conveyance channel 145 so as to cover the coating material conveyance channel 145. The above-described pattern adjustment channel disposed symmetrically with respect to the coating material conveyance channel 145 that adjusts the flat elliptical injection pattern of the air A by injecting the air A toward the extension line outside the front end portion 65 of the A7. 81.
In addition, the passage formed in the air cap 41 in the main passage 83 is referred to as the atomization passage 85 as described above.

  By adopting such a configuration, the air A introduced into the air introduction channel 25 is guided into the air conveyance channel 147 without being subjected to pressure loss, and supplied to the outside of the tip portion 65 of the nozzle 7 without deviation. Is done. Accordingly, no pressure drop occurs, and good coating is executed even when a blower having a low air flow rate and low air pressure is used because the atomization and ejection failure of the paint P are prevented.

Next, the trigger lever 3 will be described. The trigger lever 3 is provided using a hanging hook 149 provided upward from the upper surface of the main body base 33 in the gun main body 9.
Mounting bosses 151 are provided on the left and right side surfaces of the hanging hook 149 so as to project outward. A mounting hole 153 that penetrates the suspension hook 149 is formed in the mounting boss 151, and a rotation pin 155 that functions as the rotation fulcrum 15 of the trigger lever 3 is inserted into the mounting hole 153.

The trigger lever 3 is loosely fitted to both ends of the rotation pin 155, and a lever arm 157 extending in a U shape in front view shown in FIG. 10 so as to wrap around the side body 13 of the gun body 9, and a lever arm And a lever operating portion 159 formed by extending the lower end portion of 157 downward.
The lever arm 157 has a flat plate shape at the base end close to the rotation fulcrum 15, but the inner peripheral edge of the lever arm 157 is bent 90 ° into an inner flange shape at a portion covering the flat surface 97 and the lower surface of the main body base 33. ing.

  Of the portion bent into the inner flange shape, a portion that is in contact with the left and right flat surfaces 97 of the main body base 33 is a pin pressing portion 161. The connecting pin 101 described above is interposed between the rear surface of the pin pressing portion 161 and the front surface of the valve body 117 of the air valve 111 accommodated in the main body base 33 so as to sandwich the side body portion 13 of the gun main body 9. It is provided in parallel.

In this way, the trigger lever 3 is provided on the outer side so as to sandwich the side body portion 13 of the gun body 9, and the communication pin 101 for transmitting the movement of the trigger lever 3 to the air valve 111 is provided. The air transport channel 147 can be formed without hindering movement or narrowing the opening diameter of the air transport channel 147.
In addition, the use of the contact pin 101 enables a layout in which the rotation fulcrum 15 of the trigger lever 3 is installed above the gun body 9, thereby preventing the trigger lever 3 from rotating more than necessary. Since the needle valve 109 and the air valve 111 can be opened and closed with a relatively small stroke, the operability of the coating spray gun 1 is improved.

Next, FIG. 8 shows an operation procedure and an operation mode of each part when painting is performed using the spray gun 1 thus constructed. (1) Non-operation and (2) Operation shown in FIG. Explain in time.
(1) Non-operation (see Fig. 8)
When not in operation, as shown in FIG. 8, the needle valve 109 protrudes most forward by the forward biasing force of the needle return spring 135. In this state, the needle valve 109 is in a closed state in which the valve action portion 113 at the tip of the needle valve 109 closes the ejection port 67 provided at the tip portion 65 of the nozzle 7.
Further, the air valve 111 is in a state of being moved most forward by the forward biasing force of the air valve return spring 125. In this state, the seal ring 121 provided for the valve body 117 of the air valve 111 is in contact with a tapered surface 163 that functions as a valve seat provided at the boundary between the small diameter space and the large diameter space in the main body base 33. The air valve 111 is in the closed state.

(2) During operation (see Fig. 9)
When the grip portion 11 is gripped by hand and a finger is put on the lever operation portion 159 of the trigger lever 3 and the trigger lever 3 is pulled backward, the trigger lever 3 is predetermined counterclockwise in FIG. The angle is rotated. As the trigger lever 3 rotates, the front end surface of the connecting pin 101 is pushed from the pin pushing portion 161, and the connecting pin 101 is guided by the guide groove 99 and the guide hole 103 to move backward.

Along with this, the rear end surface of the connecting pin 101 pushes the valve body 117 in the air valve 111 backward and moves it by a predetermined stroke against the forward biasing force of the air valve return spring 125.
Since the seal ring 121 is also separated from the tapered surface 163 by the rearward movement of the valve body 117, the air valve 111 is opened. Then, the air A introduced into the air introduction channel 25 flows into the air conveyance channel 147, and the air A that has flowed into the air conveyance channel 147 is directly forward along the air conveyance channel 147 as it is. It is conveyed toward.

A part of the air A reaching the rear surface of the pattern adjusting plate 45 enters the atomizing flow path 85 in the air cap 41 through the main opening 73 and is discharged from the main injection port 87 to the atmosphere. The remaining air A passes through the pattern opening 75 and enters the air cap 41 and the pattern adjusting flow path 81 formed in the jaw-shaped protrusion 89 formed on the front surface of the air cap 41 and enters the atmosphere from the pattern adjusting injection port 91. Released into.
As an example, the amount of air discharged from the main injection port 87 and the pattern adjustment injection port 91 is 1100 L / min.

Further, when the air valve 111 moves, the rear end surface of the slide sleeve 115 in the air valve 111 pushes the front surface of the flange portion 131 of the needle end 133 backward against the forward biasing force of the needle return spring 135. The integral needle valve 109 also moves backward by a predetermined stroke.
The needle valve 109 is in an open state because the valve action portion 113 at the tip that initially closed the jet outlet 67 is moved away from the jet outlet 67 by the backward movement of the needle valve 109. Then, the paint P in the paint cup 5 flows into the paint inflow path 143 by the pumping action generated by the movement of the needle valve 109, and is further ejected from the ejection port 67 through the paint transport path 145. Since the air flow path 141 and the paint cup 5 communicate with each other via the hose 36, the inside of the paint cup 5 is pressurized and the paint P is pumped.

The paint P ejected from the ejection port 67 is immediately atomized by the air A discharged from the main injection port 87, and the injection pattern is adjusted to a flat elliptical shape by the air A discharged from the pattern adjustment injection port 91. It is injected with.
The paint P sprayed from the jet port 67 is relatively low speed and low pressure, and since there is no particular bias in the spray direction and spray pattern, the paint P does not scatter or rebound from the surface to be coated. Painting is performed.

As described above, the first embodiment which is an example of the best mode for carrying out the present invention has been described in detail. However, the specific configuration is not limited to the above-described configuration and does not depart from the gist of the present invention. Any change in design within the scope is also included in the present invention.
For example, the gun body 9 may be configured as an integral member and the cup attachment position adjustment attachment 31 may not be used. In this case, however, members such as the air cap 41, the pattern adjusting plate 45, and the cup mounting boss 59 are directly attached to and provided on the integrally constructed gun body 9.

  Further, the mounting position of the cup mounting position adjusting attachment 31 can be switched in four stages at intervals of 90 ° as in the illustrated embodiment, and can be switched more finely by changing the number of the guide grooves 49 and the mounting angle. Alternatively, it may be possible to switch only in two stages, vertical and horizontal. Alternatively, if the cup attachment position adjustment attachment 31 cannot be detached from the main body base 33 but is connected to the main body base 33 in a rotatable state, the attachment position of the cup attachment position adjustment attachment 31 can be adjusted steplessly. Thus, when the attachment fixing nut 39 is tightened after the attachment position is determined, the attachment position is fixed.

Further, the positional relationship between the guide groove 49 and the guide protrusion 51 may be reversed, and the guide protrusion 51 may be provided on the cup attachment position adjustment attachment 31 side, and the guide groove 49 may be provided on the main body base 33 side.
As a means for fixing the cup attachment position adjustment attachment 31, various mechanisms such as a clamp type using a turnbuckle or the like can be employed in addition to a screw fastening by an attachment fixing nut 39.

It is a perspective view which shows the spray gun for coating which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the spray gun for coating which concerns on Embodiment 1 of this invention. It is a side view which shows the spray gun for coating which concerns on Embodiment 1 of this invention. It is a side view of the state which removed the cup attachment position adjustment attachment which shows the spray gun for painting concerning Embodiment 1 of the present invention. It is a front view which shows the state which attached the paint cup to the spray gun for painting which concerns on Embodiment 1 of this invention in portrait orientation. It is a front view which shows the state which attached the coating material cup sideways to the spray gun for coating which concerns on Embodiment 1 of this invention. It is a front view of the state which removed the air cap which shows the spray gun for painting concerning Embodiment 1 of the present invention. It is a sectional side view at the time of the non-operation which shows the spray gun for painting concerning Embodiment 1 of the present invention. It is a sectional side view at the time of operation | movement which shows the spray gun for coating which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the state fractured | ruptured by the AA line in FIG. It is a sectional side view which shows the structure of the conventional spray gun for coating.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spray gun for painting 3 Trigger lever 5 Paint cup 7 Nozzle 9 Gun body 11 Grip part 13 Side trunk part 15 Rotating fulcrum 17 Grip core material 19 Grip cover 21 Hose joint 23 Male thread part 25 Air introduction flow 31 Cup installation position adjustment Attachment 33 Main body base 35 Male thread portion 37 Cap fixing nut 39 Attachment fixing nut 41 Air cap 43 Engaging groove 45 Pattern adjusting plate 47 Engaging protrusion 49 Guide groove 51 Guide protrusion 53 Nozzle holder 55 Holding sleeve 57 Connecting rib 59 Cup mounting boss 61 Cup joint 63 Needle valve packing holder 65 Tip 67 Spout 69 Stepped locking portion 71 Cap return spring 73 Main opening 75 Pattern opening 77 Spherical protrusion 79 Spherical recess 81 Pattern adjustment flow path 83 Passage 85 atomizing passage 87 main injection port 89 jaw projection 91 pattern adjustment injection port 93 stepped portion 95 circlip 97 flat surface 99 the guide groove 101 contacts pin 103 guide hole
105 Air valve adjustment cap bolt 107 Paint adjustment cap bolt 109 Needle valve 111 Air valve 113 Valve action part 115 Slide sleeve 117 Valve body 119 Outer peripheral step part 121 Seal ring 123 Spring receiving peripheral groove 125 Air valve return spring 127 Spring receiving boss 129 Through Hole 131 Flange 133 Needle end 135 Needle return spring 137 Spring receiving boss 139 Paint flow path 141 Air flow path 143 Paint inflow path 145 Paint transport path 147 Air transport path 149 Hanging hook 151 Mounting boss 153 Mounting hole 155 Rotation Pin 157 Lever arm 159 Lever operation part 161 Pin pushing part 163 Tapered surface A Air P Paint

Claims (3)

By rotating the trigger lever, the paint in the paint cup reaches the inside of the nozzle tip, and the paint supplied to the inside of the nozzle tip is supplied from the outside of the nozzle to the nozzle tip by supplying air at a predetermined pressure and flow rate. In the spray gun for hand gun type spraying to be atomized and sprayed, the paint spray gun has a paint inflow path for bringing the paint in the paint cup into the gun body and a paint for transporting the paint flowing into the gun body into the nozzle tip. A paint flow path composed of a transfer flow path, an air introduction flow path for bringing air of a predetermined pressure and flow rate supplied from the outside into the gun body, and air introduced into the gun body outside the nozzle tip An air flow path constituted by an air transfer flow path for transferring, and the air transfer flow path is parallel to the paint transfer flow path and is an air flow path. From the branch point between Iriryu path toward the nozzle tip is linearly formed, the trigger lever has a rotation fulcrum on a side barrel portion above the gun body, it is loosely fitted on both ends of the pivot point A lever arm extended in a U-shape in front view so as to wrap around the side body of the gun body, and a lever operating portion formed by extending the lower end of the lever arm further downward, and One part of the lever arm is a pin pushing portion bent into an inner flange shape, and the gun main body is between the pin pushing portion and the air valve loaded in the air conveyance passage. The connecting pin is provided in parallel so as to sandwich the side body portion of the gun body, and is provided on the outer side so as to sandwich the side body portion of the gun body without traversing the air conveyance flow path. Spray gun for painting. 2. The spray gun for painting according to claim 1, wherein the two communication pins are provided so as to sandwich the left and right side body portions of the gun body , and the urging force from the air valve return spring is normally applied via the air valve. The air valve is pressed against the urging force of the air valve return spring, and the air valve is pressed against the urging force of the air valve return spring to move it in the direction of communication between the air introduction flow path and the air transport flow path. A spray gun for painting, characterized in that 3. The spray gun for coating according to claim 1 or 2, wherein the air conveying channel is branched from the main channel and a main channel that is guided to the outside of the nozzle tip without being biased around the air conveying channel so as to cover the coating material conveying channel. And a pattern adjusting channel arranged symmetrically with respect to the paint conveying channel for adjusting the air injection pattern by injecting air toward the extended line outside the nozzle tip. Spray gun for painting.

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