JP3433056B2 - Rotary atomizing head type coating equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing head type coating apparatus suitable for coating an object to be coated such as an automobile body.

[0002]

2. Description of the Related Art In general, a rotary atomizing head type coating apparatus is widely known as a coating apparatus for coating an object to be coated such as an automobile body. Therefore, a rotary atomizing head type coating apparatus according to such a conventional technique will be described with reference to FIGS. 28 and 29.

Reference numeral 300 denotes a rotary atomizing head type coating apparatus. The rotary atomizing head type coating apparatus 300 has a cylindrical housing 301, an air motor 302 provided in the housing 301, and an air motor 302. Inserted axially,
Rotating shaft 3 rotated by the air motor 302
03 and a rotary atomizing head 304 which is located on the front side of the housing 301, is attached to the rotary shaft 303, and sprays paint by rotating at high speed.

Here, the tip end side of the rotary shaft 303 projects outside the air motor 302 to become a mounting shaft portion 303A,
The rear side of the rotary atomizing head 304 serves as a cylindrical mounting tube portion 304A into which the mounting shaft portion 303A is inserted, and the rotating shaft 3
The mounting shaft portion 303A of No. 03 and the mounting cylinder portion 304A of the rotary atomizing head 304 are fixed by the screw portion 305.

In the rotary atomizing head type coating apparatus 300 having the above-described structure, the rotary atomizing head 30 is driven by the air motor 302.
4 is rotated at a high speed, and the paint is supplied to the rotary atomizing head 304 in this state, whereby the paint is atomized by the centrifugal force when the rotary atomizing head 304 rotates, and the paint particles are applied to an object to be coated. It is designed to be worn.

[0006]

By the way, this type of rotary atomizing head type coating apparatus is used when changing the color of the paint, when finishing the work,
It is necessary to clean the rotary atomizing head when the work is interrupted. For this reason, in the rotary atomizing head type coating device, the work of removing the rotary atomizing head from the rotary shaft, cleaning it, and reattaching it for use is repeated.

However, according to the above-mentioned prior art,
The rotary shaft 303, the rotary atomizing head 304, and the screw portion 305 are used for fixing. In this case, the screw portion 305 is formed in the direction opposite to the rotating direction of the rotating shaft 303 so that the rotating shaft 303 is tightened with respect to the rotating atomizing head 304 when the air motor 302 is started.

However, if a problem occurs in the drive unit of the air motor 302 during high speed rotation of the air motor 302, the number of rotations of the air motor 302 may be rapidly reduced. In such a case, the rotary atomizing head 304 and the rotary shaft 303
A force in the direction opposite to that at the time of starting the air motor 302 may act between and, and the rotary atomizing head 304 may loosen with respect to the rotary shaft 303. In this way, when the rotation speed of the air motor 302 is suddenly changed, the rotary atomizing head 304 causes the rotary shaft 303 to rotate.
There is a problem that it is easy to fall out of.

The rotary atomizing head 304 is made as small and lightweight as possible by using, for example, an aluminum alloy, a resin material or the like, in order to reduce the rotational load. However, since aluminum alloy and resin materials have low rigidity, when the air motor 302 is driven at high speed,
Due to the centrifugal force, the mounting cylinder portion 304A of the rotary atomizing head 304 spreads outward in the radial direction, and the rotary atomizing head 304 moves toward the rotating shaft 303.
There is a problem that it is easy to loosen.

In order to solve such a problem, the mounting cylinder portion 304A of the rotary atomizing head 304 is formed to have a thick wall to increase its rigidity, thereby preventing the mounting cylinder portion 304A from spreading outward in the radial direction. be able to. However, in this case, the rotary atomizing head 304 becomes heavy and the rotational load increases, so it is necessary to increase the drive torque of the air motor 302. Therefore, the air motor 302 becomes large,
The restrictions on the design of the coating device become large, such as the increase in energy consumption.

When cleaning the rotary atomizing head 304 according to the prior art, the rotary atomizing head 304 is relatively rotated in the direction in which the screw is loosened and removed from the rotary shaft 303.
To wash. Then, when the cleaning of the rotary atomizing head 304 is completed, the rotary atomizing head 304 is relatively rotated in the direction in which the screw is tightened, attached to the rotary shaft 303, and reassembled. However, in the conventional rotary atomizing head type coating device 300, in order to loosen or tighten the rotary atomizing head 304,
There is a problem that a separate tool is required and it takes time to remove and install the rotary atomizing head 304.

Further, the recent rotary atomizing head type coating apparatus 300
Then, in order to improve the coating quality, the rotary atomizing head 304 is rotated at a high speed of, for example, 20000 rpm or more to miniaturize the spray paint. Therefore, the rotary atomizing head 30
No. 4 requires a highly accurate rotation balance so that it always rotates with respect to the axis line without eccentricity.

However, if the rotary atomizing head 304 is detachable from the rotary shaft 303 as in the prior art described above, even if the rotational balance of the rotary atomizing head 304 is adjusted in advance, the screws are tightened during reassembly. The rotation balance may be affected by the strength. Therefore, it is necessary to readjust the rotational balance of the rotary atomizing head 304, which requires a lot of time and cost.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention is a rotary atomizing head type coating apparatus in which the rotary atomizing head can be easily disassembled, washed and assembled from the rotary shaft. The purpose is to provide. Another object of the present invention is a rotary atomizing head type coating device capable of maintaining the rotational balance of the rotary atomizing head even after reassembling the rotary atomizing head with respect to the rotary shaft during disassembly and cleaning. To provide.

[0015]

In order to solve the above-mentioned problems, a rotary atomizing head type coating apparatus according to the present invention uses an air motor that rotates at high speed by supplying air, and an air motor whose base end side in the axial direction is formed by the air motor. A rotating shaft that is rotatably supported and has a tip end side that protrudes out of the air motor to serve as a mounting shaft portion;
The rotary atomizing head has a bell shape on the front side and a mounting cylinder portion on the rear side that is mounted on the mounting shaft portion of the rotary shaft.

The invention according to claim 1 is characterized in that a ring fitting groove provided on one of the mounting shaft portion of the rotary shaft and the mounting cylinder portion of the rotary atomizing head, and A ring engaging step portion provided on the other side of the mounting shaft portion of the rotating shaft and the mounting cylinder portion of the rotary atomizing head and at a position facing the ring fitting groove, and the ring fitting groove. An elastic ring that is fitted and that detachably holds the rotary atomizing head by elastically engaging the ring engaging step with the rotary atomizing head attached to the rotary shaft. Especially.

With this configuration, when the mounting shaft portion of the rotary shaft and the mounting cylinder portion of the rotary atomizing head are fitted together, the elastic ring fitted in the ring fitting groove is attached to the mounting shaft portion. The elastic atomizing head is elastically deformed with respect to the rotating shaft to prevent the rotary atomizing head from being pulled out by elastic force. For this reason, when the rotary atomizing head is rotated at high speed, the mounting cylinder portion of the rotary atomizing head is elastically held by the elastic ring on the mounting shaft portion of the rotating shaft, and with respect to the rotation center of the rotating shaft, The center of rotation of the rotary atomizing head can be matched.

According to a second aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, the mounting cylinder portion of the rotary atomizing head is formed as a female mounting cylinder portion, and the ring fitting groove is formed of the rotary shaft. The male mounting shaft portion is provided on the outer peripheral surface, and the ring engaging step portion is provided on the inner peripheral surface of the female mounting cylinder portion of the rotary atomizing head.

With this structure, the elastic ring is fitted in the ring fitting groove of the rotary shaft when the male mounting shaft portion of the rotary shaft is fitted in the female mounting cylinder portion of the rotary atomizing head.
The elastic ring is in pressure contact with and engages with the ring engaging step portion on the inner peripheral surface of the female mounting cylinder portion. Therefore, the rotary atomizing head is held in the retaining state by the resistance force of the elastic ring.

According to a third aspect of the invention, another ring fitting groove is provided on the outer peripheral surface of the male mounting shaft portion of the rotary shaft at a position axially separated from the ring fitting groove, and the other ring fitting groove is provided. Another elastic ring is fitted and provided, and a ring abutting surface with which the elastic ring abuts is provided on the inner peripheral surface of the female mounting cylinder portion.

With this configuration, the elastic ring is fitted into the ring fitting groove of the rotary shaft when the male mounting shaft portion of the rotary shaft is fitted in the female mounting cylinder portion of the rotary atomizing head.
The elastic ring is in pressure contact with and engages with the ring engaging step portion on the inner peripheral surface of the female mounting cylinder portion. At this time, the other elastic ring fitted in the other ring fitting groove is in pressure contact with the ring contact surface provided on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head. Therefore, the rotary atomizing head is held in the retaining state by the resistance force of the two elastic rings.

According to a fourth aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, the mounting cylinder portion of the rotary atomizing head is formed as a female mounting cylinder portion, and the ring fitting groove is rotary atomizing. The structure is provided on the inner peripheral surface of the female mounting cylinder portion of the head, and the ring engaging step portion is provided on the outer peripheral surface of the male mounting shaft portion of the rotary shaft.

With this configuration, the elastic ring is fitted in the ring fitting groove of the rotary atomizing head when the male mounting shaft portion of the rotary shaft is fitted in the female mounting cylindrical portion of the rotary atomizing head. The elastic ring is pressed against and engaged with the ring engaging step portion on the outer peripheral surface of the male mounting shaft portion. Therefore, the rotary atomizing head is held in the retaining state by the resistance force of the elastic ring.

According to the invention of claim 5, another ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head at a position axially separated from the ring fitting groove, and the other ring fitting is provided. Another elastic ring is fitted in the groove, and a ring abutting surface with which the elastic ring abuts is provided on the outer peripheral surface of the male mounting shaft portion.

With this structure, the elastic ring is fitted in the ring fitting groove of the rotary atomizing head when the male mounting shaft portion of the rotary shaft is fitted in the female mounting cylindrical portion of the rotary atomizing head. The elastic ring is brought into pressure contact with and engages with the ring engaging step portion on the outer peripheral surface of the male mounting shaft portion. At this time, the other elastic ring fitted in the other ring fitting groove is in pressure contact with the ring contact surface provided on the outer peripheral surface of the male mounting shaft portion of the rotary shaft. Therefore, the rotary atomizing head is held in the retaining state by the resistance force of the two elastic rings.

According to a sixth aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, the mounting cylinder portion of the rotary atomizing head is formed as a female mounting cylinder portion, and the ring fitting groove is axially formed. Separatedly provided at two locations on the outer peripheral surface of the male mounting shaft portion of the rotary shaft, and provided on the inner peripheral surface of the female mounting cylinder portion of the rotary atomizing head with a wide diameter expanding groove portion extending in the axial direction, and the ring engaging step portion has the wide width expanding portion. The configuration is such that one is provided at each end of the radial groove portion in the axial direction.

With this configuration, when the male mounting shaft portion of the rotary shaft is fitted in the female mounting cylinder portion of the rotary atomizing head, the elastic ring is fitted in each ring fitting groove, and The rings are respectively fitted in the wide-diameter expanded groove portions. At this time, since each elastic ring is pressed and engaged with the ring engaging step portions at both ends in the axial direction of the wide expanded groove portion, the rotary atomizing head is held in the retaining state by the resistance force of each elastic ring. To be done.

According to a seventh aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, the mounting barrel portion of the rotary atomizing head is formed as a female mounting barrel portion, and the ring fitting groove is axially formed. Separatedly provided at two locations on the inner peripheral surface of the female mounting cylinder portion of the rotary atomizing head, and provided at the outer peripheral surface of the male mounting shaft portion of the rotary shaft with wide-width reduced diameter groove portions extending in the axial direction, and the ring engaging step portion is provided with the wide-width reduction groove. The configuration is such that one is provided at each end of the radial groove portion in the axial direction.

With this configuration, when the male mounting shaft portion of the rotary shaft is fitted in the female mounting cylinder portion of the rotary atomizing head, the elastic ring is fitted in each ring fitting groove, and The rings are respectively fitted in the wide-diameter reduced groove portions. At this time, since each elastic ring is pressed and engaged with the ring engaging step portions at both ends in the axial direction of the wide diameter reducing groove portion, the rotary atomizing head is held in the retaining state by the resistance force of each elastic ring. To be done.

According to the eighth aspect of the invention, the mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, and the male mounting shaft portion is provided with an inclined outer peripheral surface whose outer peripheral surface is inclined toward the center of rotation. The atomizing head has a mounting cylinder portion formed as a female mounting cylinder portion, and the female mounting cylinder portion is provided with an inclined inner peripheral surface corresponding to an inclined outer peripheral surface.

With this configuration, when the male mounting shaft portion of the rotary shaft is fitted in the female mounting cylinder portion of the rotary atomizing head, the inclined outer peripheral surface of the male mounting shaft portion is inclined with respect to the female mounting cylinder portion. It is in contact with the inner peripheral surface. At this time, since the rotary atomizing head is oriented to the center of rotation of the rotary shaft by the inclined outer peripheral surface of the male mounting shaft, the rotary atomizing head is automatically positioned at the center of rotation of the rotary shaft.

According to a ninth aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a female mounting cylinder portion, the mounting cylinder portion of the rotary atomizing head is formed as a male mounting shaft portion, and the ring fitting groove is rotary atomizing. The male mounting shaft portion of the head is provided on the outer peripheral surface thereof, and the ring engaging step portion is provided on the inner peripheral surface of the female mounting cylinder portion of the rotating shaft.

With this structure, the elastic ring is fitted in the ring fitting groove of the rotary atomizing head when the male mounting shaft of the rotary atomizing head is fitted in the female fitting cylinder of the rotary shaft. The elastic ring is pressed against and engaged with the ring engaging step on the inner peripheral surface of the female mounting cylinder. Therefore, the rotary atomizing head is held in the retaining state by the resistance force of the elastic ring.

According to a tenth aspect of the invention, another ring fitting groove is provided on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head at a position axially separated from the ring fitting groove, and the other ring fitting groove is provided. Another elastic ring is fitted in the groove, and a ring contact surface with which the elastic ring abuts is provided on the inner peripheral surface of the female mounting cylinder.

With this configuration, the elastic ring is fitted in the ring fitting groove of the rotary atomizing head when the male mounting shaft of the rotary atomizing head is fitted in the female fitting cylinder of the rotary shaft. The elastic ring is brought into pressure contact with and engages with the ring engaging step portion on the inner peripheral surface of the female mounting cylinder portion. At this time, the other elastic ring fitted in the other ring fitting groove is in pressure contact with the ring contact surface provided on the inner peripheral surface of the female mounting cylinder of the rotating shaft. Therefore, the rotary atomizing head is held in the retaining state by the resistance force of the two elastic rings.

According to the invention of claim 11, the mounting shaft portion of the rotary shaft is formed as a female mounting cylinder portion, the mounting cylinder portion of the rotary atomizing head is formed as a male mounting shaft portion, and the ring fitting groove is formed in the rotary shaft. The female mounting cylinder portion is provided on the inner peripheral surface thereof, and the ring engaging step portion is provided on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head.

With this configuration, the elastic ring is fitted in the ring fitting groove of the rotary shaft when the male mount shaft of the rotary atomizing head is fitted in the female mount cylinder of the rotary shaft.
The elastic ring is pressed against and engaged with a ring engaging step portion on the outer peripheral surface of the male mounting shaft portion. Therefore, the rotary atomizing head is held in the retaining state by the resistance force of the elastic ring.

According to a twelfth aspect of the present invention, another ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder portion of the rotary shaft at a position axially separated from the ring fitting groove, and the other ring fitting groove is provided. Another elastic ring is fitted and provided, and a ring contact surface with which the elastic ring abuts is provided on the outer peripheral surface of the male mounting shaft portion.

With this structure, the elastic ring is fitted in the ring fitting groove of the rotary shaft when the male mount shaft of the rotary atomizing head is fitted in the female mount cylinder of the rotary shaft.
The elastic ring is pressed against and engaged with the ring engaging surface of the outer peripheral surface of the male mounting shaft portion. At this time, the other elastic ring fitted in the other ring fitting groove is in pressure contact with the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head. Therefore, the rotary atomizing head is held in the retaining state by the resistance force of the two elastic rings.

According to a thirteenth aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a female mounting cylinder portion, the mounting cylinder portion of the rotary atomizing head is formed as a male mounting shaft portion, and the ring fitting groove is axially formed. Separatedly provided at two locations on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head, and provided at the inner peripheral surface of the insertion hole portion of the rotary shaft with a wide diameter expanding groove portion extending in the axial direction, and the ring engaging step portion has the wide diameter expanding diameter portion. The structure is such that one portion is provided on each end of the groove in the axial direction.

With this configuration, the elastic rings are fitted into the ring fitting grooves when the male mounting shaft of the rotary atomizing head is fitted in the female mounting cylinder of the rotary shaft, and The rings are fitted in the wide-diameter expansion groove portions, respectively. At this time, since each elastic ring is pressed and engaged with the ring engaging step portions at both ends in the axial direction of the wide expanded groove portion, the rotary atomizing head is held in the retaining state by the resistance force of each elastic ring. To be done.

In the fourteenth aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a female mounting cylinder portion, the mounting cylinder portion of the rotary atomizing head is formed as a male mounting shaft portion, and the ring fitting groove is axially formed. Separatedly provided at two locations on the inner peripheral surface of the female mounting cylinder portion of the rotary shaft, and provided on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head with a wide reduced diameter groove portion extending in the axial direction, and the ring engagement stepped portion has the wide reduced diameter. The configuration is such that one is provided at each end of the radial groove portion in the axial direction.

With this configuration, the elastic rings are fitted in the respective ring fitting grooves when the male mounting shaft portion of the rotary atomizing head is fitted in the female mounting cylinder portion of the rotating shaft, and The rings are fitted in the wide-width reduced groove portions, respectively. At this time, since each elastic ring is pressed and engaged with the ring engaging step portions at both ends in the axial direction of the wide diameter reducing groove portion, the rotary atomizing head is held in the retaining state by the resistance force of each elastic ring. To be done.

According to a fifteenth aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a female mounting cylindrical portion, and the female mounting cylindrical portion is provided with an inclined inner peripheral surface whose inner peripheral surface is inclined toward the center of rotation. The mounting cylinder of the rotary atomizing head is formed as a male mounting shaft, and the male mounting shaft has an outer peripheral surface provided with an inclined outer peripheral surface corresponding to the inclined inner peripheral surface.

With this configuration, when the male mounting shaft portion of the rotary atomizing head is fitted in the female mounting barrel portion of the rotary shaft, the inclined inner peripheral surface of the female mounting barrel portion corresponds to the male mounting shaft portion. It is in contact with the inclined outer peripheral surface. At this time, since the rotary atomizing head is oriented to the center of rotation of the rotary shaft by the inclined inner peripheral surface of the female mounting cylinder, the rotary atomizing head is automatically positioned at the center of rotation of the rotary shaft.

[0046]

DETAILED DESCRIPTION OF THE INVENTION A rotary atomizing head type coating apparatus according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

First, FIGS. 1 to 4 show a first embodiment of the present invention.

In the figure, reference numeral 1 is a rotary shaft of an air motor, the rotary shaft 1 is formed hollow, and an air turbine (not shown) is fixed to the base end side of the rotary shaft 1. Then, the driving air is supplied to the air turbine to rotationally drive the air turbine, whereby the rotating shaft 1 rotates at a high speed with the axis line OO.

Reference numeral 2 denotes a male mounting shaft portion according to the present embodiment provided on the tip side of the rotating shaft 1. The male mounting shaft portion 2 has a large diameter shaft portion 2A having the same diameter as the rotating shaft 1 and the large diameter shaft. It is composed of a small diameter shaft portion 2B located on the tip side of the portion 2A and having a diameter smaller than that of the rotating shaft 1. Then, a rotary atomizing head 4 described later is attached to the male mounting shaft portion 2.
Is installed.

Reference numeral 3 is a feed tube arranged on the inner peripheral side of the rotary shaft 1. The tip side of the feed tube 3 is a small diameter nozzle 3A, and the nozzle 3A projects from the tip side of the male mounting shaft portion 2. There is. The feed tube 3 discharges the paint and the solvent from the nozzle 3A toward the rotary atomizing head 4 side.

Reference numeral 4 denotes a rotary atomizing head attached to the tip end side of the rotary shaft 1. The rotary atomizing head 4 is composed of an atomizing head main body 5 and a hub member 7, which will be described later.

Reference numeral 5 designates the outer shape of the rotary atomizing head 4, which is, for example, an aluminum alloy atomizing head main body. The atomizing head main body 5 has an axis O--O serving as the center of rotation, and the front side gradually expands. By doing so, it is formed into a bell shape as a whole.

Here, the inner peripheral surface on the front side of the atomizing head main body 5 is
The paint thinning surface 5A gradually expands toward the front end, and the front end of the atomizing head body 5 is a discharge edge 5B continuous with the paint thinning surface 5A. Further, a nozzle insertion hole 5C for inserting the nozzle 3A of the feed tube 3 is provided in the central portion of the atomizing head body 5 in the radial direction. further,
The rear side of the atomizing head body 5 is a small-diameter tubular portion 5D, and the tubular portion 5D constitutes a mounting tubular portion 6 described later.

Then, the paint is supplied to the atomizing head main body 5 while the rotary atomizing head 4 is rotating at a high speed. At this time, the paint supplied to the paint film thinning surface 5A is thinned on the paint film thinning surface 5A, and then discharged as liquid thread from the discharge edge 5B, and this liquid thread is sprayed as paint particles.

Reference numeral 6 denotes a female mounting cylinder portion according to the present embodiment, which is provided in the cylindrical portion 5D of the atomizing head main body 5. The inner peripheral side of the female mounting cylinder portion 6 has a bottomed fitting hole 6A. The opening side of the fitting hole 6A is the insertion opening 6B, and the back side is the bottom surface 6C. An annular expanded groove portion 10, a ring engagement step portion 11, a ring contact surface 12 and the like, which will be described later, are formed in the fitting hole 6A. The inner diameter of the insertion port 6B is slightly larger than the outer diameter of the large diameter shaft portion 2A of the male mounting shaft portion 2.

Reference numeral 7 denotes a disk-shaped hub member provided on the paint thinning surface 5A side of the atomizing head main body 5. The hub member 7 has paint and solvent on the outer peripheral side of the atomizing head main body 5. Paint thin film surface 5A
A large number of first hub holes 7A, 7A, ...
A plurality of second hub holes 7B, 7B, ... For supplying a solvent to the front surface of the hub member 7 are provided on the central portion side.

Reference numeral 8 denotes a first ring fitting groove provided on the outer peripheral surface 2C of the large-diameter shaft portion 2A. The ring fitting groove 8 is located in a radial direction at a position facing a ring engaging step portion 11 described later. It is annularly recessed so as to open outward. And
An O-ring 13 described later is fitted in the ring fitting groove 8.

Reference numeral 9 is a second ring fitting groove provided on the outer peripheral surface 2D of the small-diameter shaft portion 2B so as to be axially separated from the first ring fitting groove 8, and the ring fitting groove 9 will be described later. At the position facing the ring contact surface 12, the ring-shaped recess is annularly provided so as to open outward in the radial direction. An O-ring 14 described later is fitted in the ring fitting groove 9.

Reference numeral 10 denotes an annular expanded groove portion provided in the axial direction midway of the fitting hole 6A of the female mounting cylindrical portion 6, and the annular expanded groove portion 10 has a small diameter shaft portion 2B of the male mounting shaft portion 2 at its front end. A ring engaging step 11 to be described later is formed at a position where the rear end faces the first ring fitting groove 8 and extends halfway.

Reference numeral 11 denotes a ring engaging step portion formed on the rear end side of the annular expanded groove portion 10. The ring engaging step portion 11 is located at a position facing the first ring fitting groove 8 and is located on the rear side. It is formed in the shape of an inclined surface that gradually decreases in diameter. As a result, when the O-ring 13 is pressed against the ring engagement step portion 11,
By the elastic force of the O-ring 13, the female mounting cylinder portion 6 of the atomizing head main body 5 can be pressed against the rotary shaft 1 side to prevent the rotary atomizing head 4 from coming off.

Reference numeral 12 is a ring contact surface formed on the bottom surface 6C side of the fitting hole 6A, and the inner diameter dimension of the ring contact surface 12 is slightly larger than the outer diameter dimension of the small diameter shaft portion 2B. Has become. When the rotary shaft 1 is inserted into the fitting hole 6A, the O-ring 14 is pressed against the ring contact surface 12, and the elastic force of the O-ring 14 causes the O-ring 14 to rotate to the center of rotation (axis O-O). On the other hand, the positional deviation of the rotary atomizing head 4 is kept small.

Reference numeral 13 denotes a first O-ring as an elastic ring located on the outer peripheral side of the large-diameter shaft portion 2A and fitted in the first ring fitting groove 8, and the O-ring 13 is elastic. It is formed as a ring having a circular cross section from a rubber material having. The O-ring 13 is set to have a diameter dimension such that a part of the O-ring 13 projects outward from the ring fitting groove 8 when fitted in the ring fitting groove 8.

Here, the O-ring 13 is the ring fitting groove 8
When the male mounting shaft portion 2 of the rotary shaft 1 is pushed into the fitting hole 6A of the female mounting cylinder portion 6 of the atomizing head main body 5 while being fitted inside, the female mounting shaft portion 2 is elastically deformed. The rotary shaft 1 is allowed to be inserted into the cylindrical portion 6. The O-ring 13 is pressed against the ring engaging step portion 11 to fix the rotary atomizing head 4 to the outer peripheral side of the rotary shaft 1 by elastic force. Also,
The O-ring 13 elastically retains the rotating shaft 1 in the female mounting cylinder portion 6 so that the center of rotation of the rotating shaft 1 (axis O-
The positional deviation of the rotary atomizing head 4 with respect to (O) is suppressed to be small.

Reference numeral 14 denotes a second O-ring, which is located on the outer peripheral side of the small-diameter shaft portion 2B and is fitted in the second ring fitting groove 9 as an elastic ring. The O-ring 14 has elasticity. The rubber material has a ring having an elliptical cross section. Then, the O-ring 14 is set to have a diameter dimension such that a part of the O-ring 14 projects outward from the ring fitting groove 9 when fitted into the ring fitting groove 9.

The O-ring 14 has a ring fitting groove 9
When the male mounting shaft portion 2 of the rotary shaft 1 is pushed into the fitting hole 6A of the female mounting cylinder portion 6 of the atomizing head main body 5 while being fitted inside, the female mounting shaft portion 2 is elastically deformed. The male mounting shaft portion 2 is allowed to be inserted into the cylindrical portion 6. The O-ring 14 is pressed against the ring contact surface 12 to fix the female mounting cylinder portion 6 to the outer peripheral side of the rotary shaft 1 by elastic force. Further, the O-ring 14 is provided on the outer peripheral side of the rotary shaft 1 by the female mounting tubular portion 6
Is elastically held, the positional deviation of the rotary atomizing head 4 with respect to the rotation center of the rotary shaft 1 (axis O-O) is suppressed to be small.

The rotary atomizing head coating apparatus according to this embodiment has the above-mentioned structure, and its operation will be described below.

First, when coating an object to be coated such as a vehicle body, the rotary atomizing head 4 rotates at high speed together with the rotary shaft 1 by rotating the air motor. Then, in a state where the rotary atomizing head 4 is rotationally driven together with the rotary shaft 1, the coating material is supplied from the nozzle 3A of the feed tube 3 toward the rotary atomizing head 4. The paint supplied to the rotary atomizing head 4 flows out from the first hub hole 7A of the hub member 7 to the paint thinning surface 5A of the atomizing head main body 5 by the centrifugal force, and the paint thinning surface 5A.
Then, it becomes a uniform thin film and is sprayed as a liquid thread from the discharge edge 5B, then becomes paint particles and is applied to an object to be coated.

On the other hand, when the color is changed, a solvent such as thinner is supplied to the rotary atomizing head 4 instead of the paint, and the hub member 7
Of the atomizing head body 5 is washed with the solvent flowing out of the first hub hole 7A, and the solvent attached to the second hub hole 7B is washed by the solvent flowing out of the second hub hole 7B. Wash the front of 7.

Next, for example, in order to carefully clean the rotary atomizing head 4 and the nozzle 3A of the feed tube 3, the rotary shaft 1
The case where the rotary atomizing head 4 is removed and reattached will be described.

First, when the rotary atomizing head 4 is removed, the rotary atomizing head 4 is pushed (pulled) toward the front side against the elastic force of the first O-ring 13. O-ring 1
By elastically deforming 3, the female mounting cylinder portion 6 of the atomizing head body 5 can be forcibly pulled out from the male mounting shaft portion 2 of the rotary shaft 1.

Next, when the rotary atomizing head 4 is mounted after cleaning the rotary atomizing head 4 and the nozzle 3A, the female mounting cylinder portion 6 of the atomizing head main body 5 is replaced with the male mounting shaft portion 2 of the rotary shaft 1. , And in this state, the atomizing head body 5 is pressed toward the rotary shaft 1. As a result, the first O-ring 13 is largely elastically deformed and the fitting hole 6A is inserted into the rotary shaft 1. As described above, when the rotary atomizing head 4 is inserted and fitted, the O-ring 13 is pressed by the ring contact surface 12 toward the tip end side of the rotary shaft 1. Therefore, the rotary atomizing head 4 is held in a state in which the bottom surface 6A of the female mounting cylinder portion 6 is pressed against the tip end surface 1A of the rotary shaft 1, and even if an attempt is made to pull out the rotary atomizing head 4, the O-ring 1
The resistance force of 3 prevents the shaft 1 from coming off.

Further, since the rotary atomizing head 4 is held on the male mounting shaft portion 2 of the rotary shaft 1 by the elastic force of the O-rings 13 and 14, the rotary atomizing head 4 has the center of rotation of the rotary shaft 1 ( Axis O
It is possible to reduce the positional deviation with respect to -O), and it is possible to improve the rotational balance even when the rotary atomizing head 4 is rotated at high speed.

Further, the rotary atomizing head 4 is, for example, 20000.
When rotating at a high speed of rpm or more, the female mounting cylinder portion 6
Is slightly spread radially outward by the centrifugal force as shown in FIG. At this time, since the O-ring 13 also expands in diameter due to centrifugal force, the O-ring 13 expands from the ring fitting groove 8 toward the annular expanded groove portion 10 side, and the openings of the ring engaging step portion 11 and the ring fitting groove 8 are opened. It is pushed between the end 8A. The O-ring 14 also expands in diameter by centrifugal force and holds the rotation center of the rotary atomizing head 4 on the axis O-O.

As a result, the O-rings 13 and 14 can elastically hold the female mounting cylinder portion 6 on the outer peripheral side of the male mounting shaft portion 2 even when the rotary atomizing head 4 rotates at a high speed, and the O-rings 13 and 14 can rotate. It is possible to prevent the female mounting cylinder portion 6 of the atomizing head 4 from loosening with respect to the rotating shaft 1.

Thus, according to this embodiment, the O-rings 13 and 14 made of a rubber material having elasticity are fitted in the ring fitting grooves 8 and 9 formed in the male mounting shaft portion 2 of the rotary shaft 1. The O-rings 13 and 14 are used to hold the female mounting cylinder portion 6 of the atomizing head main body 5 with respect to the male mounting shaft portion 2 of the rotary shaft 1 in a retaining state. For this reason, in this embodiment, the rotary atomizing head 4 can be attached to and detached from the rotary shaft 1 with one touch without performing the work of tightening the screw unlike the prior art. As a result, the work of attaching and removing the rotary atomizing head 4 can be easily performed, so that the assembling property during manufacturing can be improved and the productivity can be improved.

Further, in a state where the male mounting shaft portion 2 of the rotary shaft 1 is fitted with the female mounting cylinder portion 6 of the atomizing head main body 5, the first O-ring 13 is engaged with the ring engaging step portion 11. The second O-ring 14 is in contact with the ring contact surface 12. For this reason, the rotary atomizing head 4 can be reliably prevented from falling off the rotary shaft 1 even at high speed rotation due to the resistance of the O-rings 13 and 14, and the reliability of the rotary atomizing head type coating device can be improved. You can

Further, by holding the rotary atomizing head 4 on the male mounting shaft portion 2 of the rotary shaft 1 by the elastic force of the O-rings 13 and 14, when the rotary atomizing head 4 rotates at high speed, the rotary shaft 1 The center of rotation of the rotary atomizing head 4 can be aligned with the center of rotation of. That is, the rotary atomizing head 4 can be aligned with the rotary shaft 1. Therefore, it is possible to improve the rotational balance even after the rotary atomizing head 4 is reattached, and the re-adjustment work of the rotational balance can be omitted to greatly improve the installation workability.

Further, even when the rotary atomizing head 4 is rotated at a high speed, the rotary atomizing head 4 can be elastically held on the male mounting shaft portion 2 of the rotating shaft 1, and the female mounting cylinder portion 6 can be rotated by the rotating shaft. It is possible to prevent loosening with respect to 1.

Furthermore, since the commercially available O-rings 13 and 14 can be used as the elastic ring, they can be easily replaced even if they are slightly deteriorated or damaged, and the performance can be maintained and the cost can be reduced. it can.

Next, FIG. 5 to FIG. 7 show a second embodiment of the present invention. The feature of this embodiment is that ring fitting grooves are provided at two positions on the outer peripheral surface of the male mounting shaft portion of the rotary shaft. At the same time, a ring engaging step portion is provided on the inner peripheral surface of the female mounting cylinder portion of the rotary atomizing head at a position facing the ring fitting groove.

In the figure, reference numeral 21 denotes a rotary shaft according to the present embodiment, which, like the rotary shaft 1 according to the first embodiment, is hollow and rotates at a high speed with an axis O--O. Is.

Reference numeral 22 denotes a male mounting shaft portion provided on the tip side of the rotary shaft 21 according to the present embodiment. The male mounting shaft portion 22 is different from the rotary shaft 1 according to the first embodiment in that the outer peripheral surface 22A has a uniform diameter. Has become. Then, the outer peripheral surface 22 of the male mounting shaft portion 22
Ring fitting grooves 28 and 29 described later are provided in A.

Reference numeral 23 is a feed tube disposed on the inner peripheral side of the rotary shaft 21, and the tip end side of the feed tube 23 is a nozzle 23A having a small diameter, which projects from the tip end side of the male mounting shaft portion 22.

Reference numeral 24 denotes a rotary atomizing head according to this embodiment,
The rotary atomizing head 24 includes an atomizing head main body 25 and a hub member 27, which will be described later.

Reference numeral 25 denotes an atomizing head main body having the outer shape of the rotary atomizing head 24 and having an axis O--O. The atomizing head main body 25 has a coating thin film surface 25A on the inner peripheral side of the front portion and a front end. The discharge edge 25B is formed, and is formed in a bell shape as a whole. Further, a nozzle insertion hole 25C for inserting the nozzle 23A is formed in the central portion of the atomizing head main body 25 in the radial direction. Further, the rear side of the atomizing head main body 25 becomes a small-diameter cylindrical portion 25D, and the cylindrical portion 25D is a female mounting cylindrical portion 26 described later.
Are configured.

Reference numeral 26 denotes a female mounting cylinder portion according to the present embodiment provided in the cylindrical portion 25D of the atomizing head main body 25. The female mounting cylinder portion 26 becomes a bottomed fitting hole 26A, and the fitting hole 26A. Of these, the opening side is the insertion port 26B. The fitting hole 26A is formed with a wide-width expanding groove portion 30, ring engaging step portions 31, 32, etc., which will be described later.

27 is a paint film thinning surface 25 of the atomizing head body 25.
A disk-shaped hub member provided on the A side.
In the same manner as the hub member 7 according to the first embodiment, a plurality of first hub holes 27A are formed on the outer peripheral side, and a plurality of second hub holes 27B are formed on the central side.

Reference numeral 28 denotes a first ring fitting groove provided on the outer peripheral surface 22A of the male mounting shaft portion 22, and the ring fitting groove 2
8 is annularly recessed so as to open outward in the radial direction at a position facing a first ring engagement step portion 31 described later.

Reference numeral 29 denotes a second ring fitting groove provided on the outer peripheral surface 22A of the male mounting shaft portion 22 so as to be axially separated from the first ring fitting groove 28. , Provided on the tip side of the rotary shaft 21 with respect to the first ring fitting groove 28. Then, the ring fitting groove 29 is formed in a ring shape so as to open radially outward at a position facing a second ring engaging step portion 32 described later.

Reference numeral 30 denotes a wide-diameter expanding groove portion provided in the axial direction of the fitting hole 26A of the female mounting cylindrical portion 26 and extending in the axial direction. Second ring engaging step portions 31, 32 are formed.

Reference numeral 31 denotes a first ring engaging step portion provided at the rear end of the wide diameter expanding groove portion 30, and the ring engaging step portion 31.
Is formed in an inclined surface shape that gradually reduces in diameter toward the insertion opening 26B side of the female mounting tubular portion 26 at a position facing the first ring fitting groove 28. As a result, the ring engagement step portion 31
When the O-ring 33 is pressed against the
Is used to urge the female mounting cylinder portion 26 of the atomizing head body 25 toward the rear side.

A second member 32 is provided at the front end of the wide-width expanding groove portion 30 while being axially separated from the first ring engaging step portion 31.
In the ring engaging step portion, the ring engaging step portion 32 is formed in an inclined surface shape whose diameter is gradually reduced toward the bottom surface side of the female mounting cylinder portion 26. As a result, when the O-ring 34 is pressed against the ring engaging step portion 32, the elastic force of the O-ring 34 urges the female mounting cylinder portion 26 of the atomizing head main body 25 toward the front side. is there.

The numeral 33 is a first ring-shaped member which is located on the outer peripheral side of the male mounting shaft portion 22 of the rotary shaft 21 and which is fitted in the first ring fitting groove 28.
The O-ring 33 is formed of a rubber material having elasticity and has a circular cross section.

Here, the O-ring 33 is the ring fitting groove 2
The male mounting shaft portion 22 of the rotary shaft 21 in the state of being fitted inside
Is pushed into the fitting hole 26A of the female mounting cylinder portion 26 of the atomizing head main body 25 and elastically deforms to allow the rotary shaft 21 to be inserted into the female mounting cylinder portion 26. At the same time, the O-ring 33 is pressed against the ring engaging step portion 31 to urge the rotary atomizing head 24 toward the rear side.

Reference numeral 34 is a second ring-shaped member which is located on the outer peripheral side of the male mounting shaft portion 22 of the rotary shaft 21 and which is fitted into the second ring fitting groove 29.
In the same manner as the O-ring 13 according to the first embodiment, the O-ring 34 is formed as a ring having a circular cross section from a rubber material having elasticity.

Here, the O-ring 34 is the ring fitting groove 2
The male mounting shaft portion 22 of the rotary shaft 21 in the state of being fitted inside
Is pushed into the fitting hole 26A of the female mounting cylinder portion 26 of the atomizing head main body 25 and elastically deforms to allow the rotary shaft 21 to be inserted into the female mounting cylinder portion 26. At the same time, the O-ring 34 is pressed against the ring engagement step portion 32 to urge the rotary atomizing head 24 toward the front side.

When the first ring engagement step portion 31 faces the first ring fitting groove 28, the second ring engagement step portion 32 faces the second ring fitting groove 29. . Therefore, when the O-ring 33 is pressed against the first ring engaging step 31, the O-ring 34 is pressed against the second ring engaging step 32 at the same time.

Therefore, the female mounting cylinder portion 2 of the atomizing head main body 25
6 is urged toward the rear side by the elastic force of the O-ring 33, and is also urged toward the front side by the elastic force of the O-ring 34. It is attached to the male attachment shaft portion 22 in a state where it is not pulled out.

Further, the O-rings 33 and 34 elastically retain the rotary shaft 21 in the female mounting cylinder portion 26,
The misalignment of the atomizing head main body 25 with respect to the center of rotation (axis OO) of the rotating shaft 21 is suppressed to be small.

Further, the rotary atomizing head 24 is, for example, 20000.
When rotating at a high speed of rpm or more, the female mounting tube portion 26 slightly expands radially outward due to centrifugal force. At this time, the O-ring 33 also expands in diameter due to centrifugal force, so the O-ring 33 expands from the ring fitting groove 28 toward the wide-diameter expanded groove portion 30 side. This allows the O-ring 3
3 is pushed between the ring engaging step portion 31 and the opening end portion 28A located on the outer peripheral side of the ring fitting groove 28. Also,
The O-ring 34 also extends from the ring fitting groove 29 to the wide-diameter groove portion 30.
The O-ring 34 expands toward the side, and the O-ring 34 has an opening end 29 located on the outer peripheral side of the ring engaging step 32 and the ring fitting groove 9.
It is pushed between A.

As a result, the O-rings 33 and 34 can elastically hold the female mounting cylinder portion 26 on the outer peripheral side of the male mounting shaft portion 22 even when the rotary atomizing head 24 rotates at a high speed, and rotate. It is possible to prevent the female mounting cylinder portion 26 of the atomizing head 24 from loosening with respect to the rotating shaft 21.

Thus, also in the present embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. However, particularly in the present embodiment, when the male mounting shaft portion 22 of the rotary shaft 21 is inserted into the female mounting cylindrical portion 26 of the rotary atomizing head 24, the O-rings 33 and 34 become the ring engaging step portions 31 and 34. It is configured to be pressed by 32.
Therefore, while the O-ring 33 urges the rotary atomizing head 24 toward the base end side of the rotary shaft 21, the O-ring 34 urges the rotary atomizing head 24 toward the front end side of the rotary shaft 21. can do. As a result, even if the rotary atomizing head 24 rotates at a high speed, it is possible to reliably prevent the rotary atomizing head 24 from falling off the rotary shaft 21 due to the resistance of the O-rings 33 and 34.

Further, when the rotary atomizing head 24 is rotated at a high speed, the O-rings 33, 34 expand toward the inside of the wide expanded groove portion 30, so that the female mounting cylinder portion 26 loosens with respect to the rotary shaft 21. Can be prevented. Furthermore, O ring 3
The rotating atomizing head 24 can be surely aligned with the rotating shaft 21 by 3, 34.

Next, FIG. 8 and FIG. 9 show a third embodiment of the present invention. The feature of this embodiment is that the outer peripheral surface of the male mounting shaft portion of the rotary shaft is formed with an inclined outer peripheral surface so that a rotary fog is formed. The slanting inner peripheral surface corresponding to the slanting outer peripheral surface of the male mounting shaft portion is formed on the inner peripheral surface of the female mounting cylinder portion of the keratinized head.

In the figure, reference numeral 41 denotes a rotating shaft according to the present embodiment, which is hollow like the rotating shaft 1 according to the first embodiment and rotates at a high speed with an axis O--O. Is.

Reference numeral 42 denotes a male mounting shaft portion according to the present embodiment provided on the tip side of the rotating shaft 41. The male mounting shaft portion 42 has a cylindrical portion 42A having the same diameter as the rotating shaft 41 and the cylindrical portion 42A. And a taper portion 42B which is located on the tip side and whose diameter is gradually reduced toward the tip side of the rotating shaft 41. Further, the inclined outer peripheral surface 42C of the tapered portion 42B is formed so as to be inclined toward the axis O-O which is the rotation center of the rotation shaft 41.

Reference numeral 43 denotes a feed tube arranged on the inner peripheral side of the rotary shaft 41. The tip side of the feed tube 43 is a nozzle 43A having a small diameter, which projects from the tip side of the male mounting shaft portion 42.

Reference numeral 44 denotes a rotary atomizing head according to this embodiment,
The rotary atomizing head 44 is composed of an atomizing head main body 45 and a hub member 47 described later.

Reference numeral 45 denotes an atomizing head main body having an outer shape of the rotary atomizing head 44 and having an axis O--O. The atomizing head main body 45 has a coating film thinning surface 45A on the inner peripheral side of the front portion and a front end. It becomes the discharge edge 45B, and is formed in a bell shape as a whole. Further, a nozzle insertion hole 45C for inserting the nozzle 43A is formed in a central portion of the atomizing head main body 45 in the radial direction. Furthermore, the rear side of the atomizing head main body 45 becomes a small diameter cylindrical portion 45D, and this cylindrical portion 45D is a female mounting cylindrical portion 46 described later.
Are configured.

Reference numeral 46 denotes a female mounting cylinder portion according to the present embodiment provided in the cylindrical portion 45D of the atomizing head main body 45. The female mounting cylinder portion 46 becomes a bottomed fitting hole 46A, and the fitting hole 46A. Of these, the opening side is an insertion port 46B. Further, as shown in FIG. 9, the fitting hole 46A is formed with an inclined inner peripheral surface 46C whose diameter gradually increases toward the rear side. Here, the inclined inner peripheral surface 46C has an axis O which is the center of rotation of the atomizing head main body 45.
It is formed to incline toward -O and corresponds to the inclined outer peripheral surface 42C of the male mounting shaft portion 42. Further, an annular expanded groove portion 49, a ring engagement step portion 50, etc., which will be described later, are formed in the fitting hole 46A.

Reference numeral 47 is a paint film thinning surface 45 of the atomizing head main body 45.
A disk-shaped hub member provided on the A side.
, A plurality of first hub holes 47A are formed on the outer peripheral side, and a plurality of second hub holes 47B are formed on the center side.

Reference numeral 48 denotes a ring fitting groove formed in a ring shape on the outer peripheral surface 42D of the cylindrical portion 42A.
Faces a ring engaging step portion 50 described later and is open outward in the radial direction.

Reference numeral 49 denotes an annular expanded groove portion provided on the rear side of the fitting hole 46A of the female mounting cylinder portion 46.
Is gradually reduced in diameter toward the insertion port 46B side of the female mounting tubular portion 46. As a result, the annular expanded groove portion 49 forms a ring engagement step portion 50 described below at a position facing the ring fitting groove 48.

Reference numeral 50 denotes a ring engagement step portion provided on the rear end side of the annular enlarged groove portion 49, and the ring engagement step portion 50 is formed in an inclined surface shape whose diameter gradually decreases toward the insertion port 46B side. ing. Thus, when the O-ring 51 is pressed against the ring engaging step 50, the elastic force of the O-ring 51 pushes the female mounting cylinder portion 46 of the atomizing head main body 45 toward the rotary shaft 41 to rotate the atomizing head. 44 can be retained.

51 is an O mounted in the ring fitting groove 48.
A ring is shown, and the O-ring 51 is formed as a ring having a circular cross section from a rubber material having elasticity.

Here, the O-ring 51 is the ring fitting groove 4
8, the male mounting shaft portion 42 of the rotating shaft 41
When it is pushed into the female mounting cylinder portion 46 of the atomizing head main body 45, it is elastically deformed and the male mounting shaft portion 42 is inserted into the female mounting cylinder portion 46.
Allowed to be inserted. Along with this, the O-ring 51
By being pressed against the ring engaging step portion 50, the male mounting shaft portion 42 is pressed by the elastic force toward the inside of the female mounting cylindrical portion 46 of the atomizing head main body 45, and the resistance force pulls out the rotary atomizing head 44. I'm stopping.

When the female mounting cylinder portion 46 is pressed into the male mounting shaft portion 42 by the O-ring 51, the inclined inner peripheral surface 46C of the female mounting cylinder portion 46 is pressed against the inclined outer peripheral surface 42C of the taper portion 42B. . Therefore, the inclined inner peripheral surface 46C of the female mounting cylinder portion 46 is the inclined outer peripheral surface 42C of the tapered portion 42B.
The rotary atomizing head 44 is automatically positioned at the center of rotation of the rotary shaft 41 because it is oriented at the center of rotation (axis OO) of the rotary shaft 41.

Thus, in this embodiment having the above-described structure, it is possible to obtain substantially the same operational effects as those of the above-described embodiments. However, particularly in this embodiment, the inclined inner peripheral surface 46C of the female mounting cylinder portion 46 is formed to be inclined toward the rotation center of the rotating shaft 41, and the inclined outer peripheral surface 42C of the taper portion 42B is rotated around the rotating shaft 41. It is inclined to the center.

Therefore, the female mounting cylinder portion 4 of the atomizing head main body 45 is
6 is fitted to the male mounting shaft portion 42 of the rotary shaft 41, and the slanted outer peripheral surface 42C of the male mounting shaft portion 42 is brought into contact with the slanted inner peripheral surface 46C of the female mounting cylindrical portion 46, whereby rotary atomization is performed. Head 4
4 is oriented to the rotation center of the rotation shaft 41 by the inclined outer peripheral surface 42C of the tapered portion 42B. As a result, the rotary atomizing head 44 is automatically aligned with the rotary shaft 41.

Therefore, by pressing the rotary atomizing head 44 against the male mounting shaft portion 42 with the O-ring 51, the female mounting cylindrical portion 46 is pressed.
Can be automatically positioned at the center of the male mounting shaft portion 42 (axis OO).

As a result, the rotary atomizing head 44 moves from the rotary shaft 41.
Even after removing and cleaning and reattaching the rotary atomizing head 44, the rotational balance of the rotary atomizing head 44 can be maintained with high accuracy, and rebalancing of the rotary atomizing head 44 can be omitted. The workability of removal and installation work can be improved.

Next, FIG. 10 and FIG. 11 show the fourth embodiment of the present invention.
The present embodiment is characterized in that a second ring fitting groove axially separated from the first ring fitting groove is provided on the outer peripheral side of the male mounting shaft portion of the rotary atomizing head, A second elastic ring is fitted in the second ring fitting groove.

In the figure, reference numeral 61 denotes a rotary shaft according to the present embodiment, which is hollow like the rotary shaft 1 according to the first embodiment and rotates at a high speed with an axis O--O. Is.

Reference numeral 62 denotes a female mounting cylinder portion according to the present embodiment which is located on the tip side of the rotary shaft 61 and is provided on the inner peripheral side of the rotary shaft 61. The female mounting cylinder portion 62 has a stepped fitting hole. 62A,
An insertion opening 62B is formed on the opening side of the fitting hole 62A, and an end surface 62C is formed on the back side. An annular expanded groove portion 70, a ring engagement step portion 71, a ring contact surface 72, etc., which will be described later, are formed in the fitting hole 62A.

Reference numeral 63 denotes a feed tube arranged on the inner peripheral side of the rotary shaft 61, and the tip side of the feed tube 63 is a nozzle 63A having a small diameter. Here, the nozzle 63 </ b> A used in the present embodiment extends in an axially long shape toward the distal end side of the rotary shaft 61 and projects from the distal end side of the female mounting cylinder portion 62.

Reference numeral 64 denotes a rotary atomizing head according to this embodiment,
The rotary atomizing head 64 comprises an atomizing head main body 65 and a hub member 67, which will be described later.

Reference numeral 65 denotes an atomizing head main body having the outer shape of the rotary atomizing head 64 and having an axis O--O. The atomizing head main body 65 has a coating film thinning surface 65A on the inner peripheral side of the front portion and a front end. It becomes the discharge edge 65B, and is formed in a bell shape as a whole. Further, a nozzle insertion hole 65C for inserting the nozzle 63A is formed in the central portion of the atomizing head body 65 in the radial direction. Further, the rear side of the atomizing head main body 65 becomes a small diameter cylindrical portion 65D, and the cylindrical portion 65D is a male mounting shaft portion 66 described later.
Are configured.

Reference numeral 66 denotes a male mounting shaft portion according to the present embodiment provided on the cylindrical portion 65D of the atomizing head main body 65. The male mounting shaft portion 66 is a small diameter cylinder extending toward the rear side as shown in FIG. It is formed into a shape. The rear end surface 66A of the male mounting shaft portion 66 is in contact with the end surface 62C of the female mounting tubular portion 62. Further, ring fitting grooves 68, 69 described later are formed on the outer peripheral surface 66B of the male mounting shaft portion 66.

67 is the paint thin film surface 65 of the atomizing head main body 65.
A disk-shaped hub member provided on the A side.
In the same manner as the hub member 7 according to the first embodiment, a plurality of first hub holes 67A are formed on the outer peripheral side, and a plurality of second hub holes 67B are formed on the central side.

Reference numeral 68 denotes a first ring fitting groove provided on the outer peripheral surface 66B of the male mounting shaft portion 66. The ring fitting groove 68 is located at a position facing a ring engaging step portion 71 described later.
It is annularly recessed so as to open outward in the radial direction.

Reference numeral 69 denotes a second ring fitting groove provided on the outer peripheral surface 66B of the male mounting shaft portion 66 so as to be axially separated from the first ring fitting groove 68, and the ring fitting groove 69 will be described later. At a position facing the ring abutting surface 72, a ring-shaped recess is formed so as to open radially outward.

Reference numeral 70 denotes an annular expanded groove portion provided axially in the fitting hole 62A of the female mounting cylinder portion 62. The annular expanded groove portion 70 extends to the middle of the male mounting shaft portion 66 from the base end side. Then, a ring engagement step portion 71 described later is formed at a position where the tip end side faces the first ring fitting groove 68.

Reference numeral 71 is a ring engagement step portion formed on the tip side of the annular expanded groove portion 70, and the ring engagement step portion 71 is the first
Is formed in an inclined surface shape that gradually decreases in diameter toward the insertion opening 62B side at a position facing the ring fitting groove 68. As a result, when the O-ring 73 is pressed against the ring engagement step 71, the elastic force of the O-ring 73 causes the rotation shaft 61 to rotate.
The female mounting cylinder portion 62 can be pressed against the rotary atomizing head 64 side to prevent the rotary atomizing head 64 from coming off.

Reference numeral 72 is a ring contact surface formed on the end face 62C side of the fitting hole 62A. The inner diameter dimension of the ring contact surface 72 is slightly larger than the outer diameter dimension of the male mounting shaft portion 66. Has become. Then, the male mounting shaft portion 66 is fitted into the fitting hole 62A.
When inserted inside, the O-ring 7 is attached to the ring contact surface 72.
4 is brought into pressure contact with the rotary atomizing head 64 with respect to the center of rotation (axis OO) of the rotary shaft 61 by the elastic force of the O ring 74.
The misalignment of is kept small.

Reference numeral 73 denotes a first O-ring located on the outer peripheral side of the male mounting shaft portion 66 and fitted in the first ring fitting groove 68. The O-ring 73 is made of a rubber material having elasticity. Is formed as a ring having a circular cross section.

The O-ring 73 is the ring fitting groove 6
When the male mounting shaft portion 66 of the rotary atomizing head 64 is pushed into the female mounting tubular portion 62 of the rotary shaft 61 in a state of being fitted inside the female mounting tubular portion 8, the female mounting tubular portion 62 is elastically deformed. Male mounting shaft 66
Allowed to be inserted. Along with this, the O-ring 73 is
The male mounting shaft portion 66 is elastically fixed to the inner peripheral side of the rotating shaft 61 by being pressed into contact with the ring engaging step portion 71. In addition, the O-ring 73 elastically holds the male mounting shaft portion 66 in the female mounting cylindrical portion 62, so that the rotating shaft 6
The misalignment of the rotary atomizing head 64 with respect to the center of rotation 1 (axis OO) is suppressed to a small value.

Reference numeral 74 denotes a second O-ring located on the outer peripheral side of the male mounting shaft portion 66 and fitted in the second ring fitting groove 69. The O-ring 74 is made of a rubber material having elasticity. Is formed as a ring having an elliptical cross section.

The O-ring 74 is the ring fitting groove 6
9, the male mounting shaft portion 66 of the rotary atomizing head 64 is elastically deformed when the male mounting shaft portion 66 of the rotary atomizing head 64 is pushed into the fitting hole 62A of the female mounting cylinder portion 62 of the rotating shaft 61. Allow the male mounting shank 66 to be inserted into the hole 62A. At the same time, the O-ring 74 presses against the ring contact surface 72 to fix the male mounting shaft portion 66 to the inner peripheral side of the rotating shaft 61 by elastic force. In addition, the O-ring 74 elastically holds the male mounting shaft portion 66 in the fitting hole 62A of the female mounting cylindrical portion 62 of the rotating shaft, so that the O-ring 74 with respect to the center of rotation (axis O-O) of the rotating shaft 61. Thus, the positional deviation of the rotary atomizing head 64 is suppressed to be small.

Thus, also in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the first embodiment described above.

Next, FIG. 12 to FIG. 13 show the fifth embodiment of the present invention.
The present embodiment is characterized in that ring fitting grooves are provided at two positions on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head, and the ring is formed on the inner peripheral surface of the female mounting cylinder portion of the rotating shaft. The ring engaging step portion is provided at a position facing the fitting groove.

In the figure, reference numeral 81 designates a rotary shaft according to the present embodiment, which is hollow like the rotary shaft 1 according to the first embodiment and rotates at a high speed with an axis O--O. Is.

Reference numeral 82 denotes a female mounting cylinder portion according to the present embodiment, which is provided on the tip side of the rotary shaft 81. The inner peripheral side of the female mounting cylinder portion 82 is a stepped fitting hole 82A. An insertion port 82B is formed on the opening side. The fitting hole 82A is formed with a wide-width expanding groove portion 90, ring engaging step portions 91, 92, etc., which will be described later.

Reference numeral 83 denotes a feed tube arranged on the inner peripheral side of the rotary shaft 81, and the tip side of the feed tube 83 is a nozzle 83A having a small diameter. Here, the nozzle 83A of the present embodiment extends in a long shape in the axial direction toward the tip side of the rotary shaft 81, and projects from the tip side of the female mounting tubular portion 82.

Reference numeral 84 denotes a rotary atomizing head according to this embodiment,
The rotary atomizing head 84 includes an atomizing head main body 85 and a hub member 87 which will be described later.

Reference numeral 85 denotes an atomizing head main body having the outer shape of the rotary atomizing head 84 and having an axis O--O. The atomizing head main body 85 has a paint thin film surface 85A on the inner peripheral side of the front portion and a front end on the front end. It becomes the discharge edge 85B, and is formed in a bell shape as a whole. In addition, a nozzle insertion hole 85C for inserting the nozzle 83A is formed in the central portion of the atomizing head main body 85 in the radial direction. Further, the rear side of the atomizing head main body 85 is a small-diameter cylindrical portion 85D, which is a male mounting shaft portion 86 described later.
Are configured.

Reference numeral 86 denotes a male mounting shaft portion according to the present embodiment provided on the cylindrical portion 85D of the atomizing head main body 85. The male mounting shaft portion 86 is a small diameter cylinder extending toward the rear side as shown in FIG. It is formed into a shape. Further, ring fitting grooves 88, 89 described later are provided on the outer peripheral surface 86A of the male mounting shaft portion 86.

Reference numeral 87 is a paint thinning surface 85 of the atomizing head main body 85.
A disk-shaped hub member provided on the A side.
, A plurality of first hub holes 87A are formed on the outer peripheral side, and a plurality of second hub holes 87B are formed on the central portion side.

Reference numeral 88 is a first ring fitting groove provided on the outer peripheral surface 86A of the male mounting shaft portion 86 located on the front end side of the atomizing head main body 85, and the ring fitting groove 88 will be described later. At a position facing the first ring engaging stepped portion 91, it is annularly recessed so as to open outward in the radial direction.

Reference numeral 89 denotes a second ring fitting groove provided on the outer peripheral surface 86A of the male mounting shaft portion 86 so as to be axially separated from the first ring fitting groove 88, and the ring fitting groove 89 is , Is provided on the rear end side of the first ring fitting groove 88, and is annularly recessed so as to open outward in the radial direction at a position facing a second ring engaging step 92 described later. .

Reference numeral 90 denotes a wide-width expanding groove portion provided in the axial direction of the fitting hole 82A of the female mounting tubular portion 82 and extending in the axial direction. Second ring engagement steps 91, 92 are formed.

Reference numeral 91 denotes a first ring engaging step portion provided in the fitting hole 82A of the female mounting tube portion 82, and the ring engaging step portion 9
1 is located on the front end side of the wide-width expanding groove portion 90, and is formed in the shape of an inclined surface whose diameter gradually increases toward the rear end side. As a result, when the O-ring 93 is pressed against the ring engaging stepped portion 91, the atomizing head body 8 is elastically moved by the O-ring 93.
The male mounting shaft portion 86 of No. 5 is biased toward the rear side.

Reference numeral 92 denotes a second ring engagement step portion provided in the fitting hole 82A of the female mounting tube portion 82, and the ring engagement step portion 9
2 is located on the rear end side of the wide diameter expanding groove portion 90, and is formed in the shape of an inclined surface whose diameter gradually increases toward the front end side. As a result, when the O-ring 94 is pressed against the ring engaging step portion 92, the atomizing head main body 8 is caused by the elastic force of the O-ring 94.
The male mounting shaft portion 86 of No. 5 is biased toward the front side.

Reference numeral 93 denotes a first O-ring which is located on the outer peripheral side of the male mounting shaft portion 86 of the atomizing head main body 85 and is fitted in the first ring fitting groove 88. In the state of being fitted in the ring fitting groove 88, a part of the ring fitting groove 88 is set to have a diameter dimension that projects outward from the ring fitting groove 88.

Reference numeral 94 denotes a second O-ring which is located on the outer peripheral side of the male mounting shaft portion 86 of the atomizing head main body 85 and is fitted in the second ring fitting groove 89. In the state of being fitted in the ring fitting groove 89, a part of the ring fitting groove 89 is set to have a diameter dimension that protrudes to the outside.

The second ring engaging step portion 92 faces the second ring fitting groove 89 in a state where the first ring engaging step portion 91 faces the first ring fitting groove 88. Therefore, when the O-ring 93 is pressed against the first ring engaging step 91, the O-ring 94 is pressed against the second ring engaging step 92 at the same time.

Therefore, the male mounting shaft portion 8 of the atomizing head main body 85
6 is urged toward the front side by the elastic force of the O-ring 93, and is also urged toward the rear side by the elastic force of the O-ring 94. It is attached to the mounting tube portion 82 in a state that it does not come off.

The O-rings 93, 94 elastically retain the male mounting shaft portion 86 of the atomizing head main body 85 on the inner peripheral side of the rotary shaft 81, so that the center of rotation of the rotary shaft 81 (the axis O-
The positional deviation of the rotary atomizing head 84 is suppressed to be smaller than that of O).

Thus, also in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the second embodiment described above.

Next, FIG. 14 and FIG. 15 show the sixth embodiment of the present invention.
This embodiment is characterized in that the inner peripheral surface of the female mounting cylinder portion of the rotary shaft is an inclined inner peripheral surface, and the inclination of the female mounting cylinder portion is on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head. The inclined outer peripheral surface corresponding to the inner peripheral surface is formed.

In the figure, reference numeral 101 designates a rotating shaft according to the present embodiment, which, like the rotating shaft 1 according to the first embodiment, is hollow and rotates at a high speed with an axis O--O. Is.

Reference numeral 102 denotes a female mounting cylinder portion according to the present embodiment provided on the tip side of the rotating shaft 101. The female mounting cylinder portion 102 has a fitting hole 10 whose diameter gradually increases toward the leading end side of the rotating shaft 101.
2A, and the opening side of the fitting hole 102A is the insertion opening 1
It is 02B. Further, on the inner peripheral side of the fitting hole 102A, as shown in FIG. 14, an inclined inner peripheral surface 102C which is inclined toward the axis O-O which is the center of rotation of the rotary shaft 101 is formed.

Reference numeral 103 is a feed tube arranged on the inner peripheral side of the rotary shaft 101, and the tip side of the feed tube 103 is a nozzle 103A having a small diameter. The nozzle 103 </ b> A extends in the axial direction toward the tip side of the rotary shaft 101, and protrudes from the tip side of the female mounting tubular portion 102.

Reference numeral 104 denotes a rotary atomizing head according to this embodiment, and the rotary atomizing head 104 is an atomizing head main body 105 described later.
And a hub member 107.

Reference numeral 105 designates the outer shape of the rotary atomizing head 104,
An atomizing head body having an axis OO, the atomizing head body 105
Is the coating thin film surface 105A on the inner side of the front part,
The front end serves as the discharge edge 105B and is formed in a bell shape as a whole. Further, a nozzle insertion hole 105C for inserting the nozzle 103A is formed in a central portion of the atomizing head main body 105 in the radial direction. Furthermore, the atomizing head body 105
The rear portion side is a small-diameter cylindrical portion 105D.
Constitutes a male mounting shaft portion 106 described later.

Reference numeral 106 denotes a cylindrical portion 105D of the rotary atomizing head 104.
In the male mounting shaft portion according to the present embodiment, the male mounting shaft portion 106 includes a cylindrical portion 106A having a diameter slightly smaller than the inner diameter of the rotating shaft 101 and the cylindrical portion 106, as shown in FIG.
The taper portion 106B is located on the rear side of A and gradually decreases in diameter toward the rear side. An inclined outer peripheral surface 106C of the taper portion 106B is formed so as to face the axis O-O, which is the center of rotation of the rotating shaft 101, and to correspond to the inclined inner peripheral surface 102C of the female mounting cylinder portion 102 of the rotating shaft 101. .

Reference numeral 107 denotes a disc-shaped hub member provided on the paint thinning surface 105A side of the atomizing head main body 105, and the hub member 107 has a plurality of first hub holes 107A formed from the outer peripheral side. A plurality of second hub holes 107B are formed on the central side.

Reference numeral 108 denotes the outer peripheral surface 106 of the cylindrical portion 106A.
The ring fitting groove 108 is annularly recessed in D, and the ring fitting groove 108 is located on the front side of the tapered portion 106B and opens radially outward. The ring fitting groove 108 is
An O-ring 111 described later is fitted in the ring fitting groove 108 while facing a ring engaging stepped part 110 described later.

Reference numeral 109 is a fitting hole 102 of the female mounting tube portion 102.
In the annular enlarged groove portion provided on the front end side of A, the annular enlarged groove portion 109 is gradually reduced in diameter toward the insertion port 102B side of the female mounting tubular portion 102. Thereby, the annular expanded groove portion 10
9 forms a ring engagement step portion 110 described later at a position facing the ring fitting groove 108.

Reference numeral 110 denotes a ring engaging stepped portion provided on the front end side of the annular expanded groove portion 109.
Is formed in an inclined surface shape whose diameter gradually decreases toward the insertion opening 102B side. As a result, when the O-ring 111 is pressed against the ring engaging step portion 110, the O-ring 11 is pressed.
The female attaching cylinder portion 10 of the atomizing head main body 105 by the elastic force of 1.
6 is pressed against the base end side of the rotary shaft 101, and the rotary atomizing head 104
It can be stopped.

Reference numeral 111 denotes an O-ring fitted in the ring fitting groove 108. The O-ring 111 is fitted in the ring fitting groove 108, and is a male mounting shaft portion of the atomizing head main body 105. When 106 is pushed into the female mounting cylinder portion 102 of the rotating shaft 101, it elastically deforms to allow the male mounting shaft portion 106 to be inserted into the female mounting cylinder portion 102. Further, the O-ring 111 is pressed against the ring engaging step portion 110 to press the male mounting shaft portion 106 toward the inside of the female mounting cylindrical portion 102 of the rotating shaft 101 by the elastic force, and the rotation force thereof causes the rotation. The atomizing head 104 is prevented from being pulled out.

Here, when the male mounting shaft portion 106 of the atomizing head main body 105 is pressed into the female mounting cylindrical portion 102 of the rotary shaft 101 by the O-ring 111, the inclined inner peripheral surface 102C of the female mounting cylindrical portion 102 becomes Inclined outer peripheral surface 1 of taper portion 106B
It is pressed against 06C. Therefore, the inclined outer peripheral surface 106C of the taper portion 106B corresponds to the inclined inner peripheral surface 10 of the female mounting tubular portion 102.
Since it is oriented to the center of rotation (axis OO) of the rotary shaft 101 by 2C, the rotary atomizing head 104 is automatically positioned at the center of rotation of the rotary shaft 101. Thus, in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the above-described third embodiment.

Next, FIGS. 16 and 17 show a seventh embodiment of the present invention. The feature of this embodiment is that the first ring fitting groove is formed on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head. The second ring fitting groove is provided so as to be separated in the axial direction, and the second elastic ring is fitted in the second ring fitting groove.

In the figure, reference numeral 121 denotes a rotary shaft of an air motor, which is hollow like the rotary shaft 1 according to the first embodiment and rotates at a high speed with an axis O--O.

Reference numeral 122 denotes a male mounting shaft portion according to the present embodiment provided on the tip side of the rotary shaft 121.
Is composed of a large-diameter shaft portion 122A having the same diameter as the rotating shaft 121, and a small-diameter shaft portion 122B located on the tip end side of the large-diameter shaft portion 122A and having a diameter smaller than that of the rotating shaft 121.

Reference numeral 123 denotes a feed tube arranged on the inner peripheral side of the rotary shaft 21, and the tip side of the feed tube 123 serves as a small diameter nozzle 123A, which projects from the tip side of the male mounting shaft portion 122.

Reference numeral 124 denotes a rotary atomizing head which is attached to the tip end side of the rotary shaft 121 and forms an atomizing head. The rotary atomizing head 124 is composed of an atomizing head main body 125 and a hub member 127 which will be described later. There is.

Reference numeral 125 designates a bell-shaped atomizing head main body, and the atomizing head main body 125 is similar to the atomizing head main body 5 according to the first embodiment.
B, a nozzle insertion hole 125C, and a tubular portion 125D are provided.

Reference numeral 126 is the cylindrical portion 12 of the atomizing head main body 125.
In the female mounting cylinder portion according to the present embodiment provided in 5D, the inner peripheral side of the female mounting cylinder portion 126 is a stepped bottomed fitting hole 126A, and the opening side of the fitting hole 126A is a large diameter hole. Part 126B
Therefore, a small diameter hole 126C and a bottom surface 126D are formed on the inner side.

Reference numeral 127 denotes a disk-shaped hub member provided on the paint thinning surface 125A side of the atomizing head main body 125. The hub member 127 is the same as the hub member 7 according to the first embodiment. A hub hole 127A and a second hub hole 127B are formed.

Reference numeral 128 denotes a first ring fitting groove provided on the inner peripheral surface of the large-diameter hole portion 126B. The ring fitting groove 128 is located at a position facing a ring engaging step portion 131, which will be described later, in the radial direction. It is annularly recessed so as to open outward.

Reference numeral 129 denotes a second ring fitting groove provided on the inner peripheral surface of the small diameter hole portion 126C so as to be axially separated from the first ring fitting groove 128, and the ring fitting groove 129 will be described later. At a position facing the ring abutment surface 132, the ring-shaped recess is provided so as to open outward in the radial direction.

Reference numeral 130 denotes the outer peripheral surface 122 of the large diameter shaft portion 122A.
A narrow width reduced groove portion provided in C is shown, and the narrow width reduced groove portion 1 is shown.
The ring 30 has a ring engagement step 131 described below at a position facing the first ring fitting groove 128.

Reference numeral 131 denotes a ring engagement step formed in the narrow width reduced groove section 130, and the ring engagement step 131 is a position facing the first ring fitting groove 128, and gradually extends toward the rear side. It is formed in the shape of an inclined surface with a reduced diameter.

Reference numeral 132 denotes a ring contact surface formed on the tip side of the male mounting shaft portion 122, and the ring contact surface 132 forms the outer peripheral surface of the small diameter shaft portion 122B.

Reference numeral 133 is a first O-ring fitted in the first ring fitting groove 128, and the O-ring 133 is pressed against the ring engaging step 131.

Reference numeral 134 is a second O-ring fitted in the second ring fitting groove 129, and the O-ring 134 is pressed against the ring contact surface 132.

Thus, also in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the first embodiment described above.

Next, FIG. 18 and FIG. 19 show the eighth embodiment of the present invention.
The present embodiment is characterized in that ring fitting grooves are provided at two positions on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head, and the ring is formed on the outer peripheral surface of the male mounting shaft of the rotary shaft. The ring engaging step portion is provided at a position facing the fitting groove.

In the figure, reference numeral 141 denotes a rotary shaft according to this embodiment, and the rotary shaft 141 is the rotary shaft 21 according to the second embodiment.
Similarly to the above, it is formed hollow and rotates at a high speed with an axis O-O. A male mounting shaft portion 142 is provided on the tip end side of the rotating shaft 141.

Reference numeral 143 designates a feed tube arranged on the inner peripheral side of the rotary shaft 141. The tip side of the feed tube 143 becomes a nozzle 143A having a small diameter, and the male mounting shaft portion 142 is formed.
Protruding from the tip side.

Reference numeral 144 denotes a rotary atomizing head according to this embodiment, and the rotary atomizing head 144 is composed of an atomizing head main body 145 and a hub member 147 which will be described later. Then, the atomizing head main body 145 is provided with the paint film thinning surface 145A, the discharge edge 145B, the nozzle insertion hole 145C, and the cylindrical portion 145D, similarly to the atomizing head main body 25 according to the second embodiment.

Reference numeral 146 denotes the cylindrical portion 14 of the atomizing head main body 145.
In the female mounting cylinder portion according to the present embodiment provided in 5D, the inner peripheral side of the female mounting cylinder portion 146 has a bottomed fitting hole 146A. Then, first and second ring fitting grooves 148 and 149, which will be described later, are formed in the fitting hole 146A.

Reference numeral 147 denotes a disk-shaped hub member provided on the paint thinning surface 145A side of the atomizing head main body 145. The hub member 147 has the same shape as the hub member 27 of the second embodiment. A first hub hole 147A and a second hub hole 147B are formed.

Reference numeral 148 denotes a fitting hole 146 of the female mounting cylinder portion 146.
A first ring fitting groove provided on the inner peripheral surface of A is shown. The ring fitting groove 148 is located on the opening side of the fitting hole 146A and has a first ring engaging step 151 described later. It is annularly recessed so as to open inward in the radial direction at a position opposed to.

Reference numeral 149 denotes a second ring fitting groove provided in the fitting hole 146A of the female mounting cylinder portion 146 axially separated from the first ring fitting groove 148.
49 is a fitting hole 146 rather than the first ring fitting groove 148.
It is provided on the front side of A. Then, the ring fitting groove 1
49 is annularly recessed so as to open inward in the radial direction at a position facing a second ring engagement step portion 152 described later.

Reference numeral 150 denotes the outer peripheral surface 142 of the male mounting shaft portion 142.
A wide reduced diameter groove portion provided in A and extending in the axial direction is shown, and first and second ring engaging step portions 151 and 152 are formed on both axial ends of the wide reduced diameter groove portion 150. here,
The ring engagement stepped portion 151 is located on the rear end side of the wide reduced-diameter groove portion 150 so as to face the first ring fitting groove 148 and is formed in an inclined surface shape whose diameter is gradually reduced toward the front end side. . Further, the second ring engagement step portion 152 is located on the front end side of the wide reduced diameter groove portion 150 so as to face the second ring fitting groove 149, and has an inclined surface shape that gradually reduces its diameter toward the rear end side. Is formed in.

Numeral 153 is a first O-ring fitted in the first ring fitting groove 148, and the O-ring 153 is pressed against the ring engaging step 151. Also, 154 is the second
The second O-ring 154 is fitted in the ring fitting groove 149, and the O-ring 154 is pressed against the ring engaging step portion 152.

Thus, also in the present embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the second embodiment described above.

Next, FIGS. 20 and 21 show the ninth embodiment of the present invention.
The present embodiment is characterized in that an inclined inner peripheral surface is formed on the inner peripheral surface of the female mounting cylinder portion of the rotary atomizing head, and an inclined inner peripheral surface of the female mounting cylinder portion is formed on the outer peripheral surface of the male mounting shaft portion of the rotary shaft. The configuration is such that an inclined outer peripheral surface corresponding to the inner peripheral surface is formed and a ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder portion.

In the figure, reference numeral 161 indicates a rotary shaft according to the present embodiment, and the rotary shaft 161 is the rotary shaft 41 according to the third embodiment.
Similarly to the above, it is formed hollow and rotates at a high speed with an axis O-O.

Reference numeral 162 denotes a male mounting shaft portion according to the present embodiment provided on the tip side of the rotating shaft 161, and the male mounting shaft portion 162 has a cylindrical portion 162A having the same diameter as the rotating shaft 161, and the cylindrical portion 162A. And a taper portion 162B that is located on the tip end side and gradually decreases in diameter toward the tip end side of the rotating shaft 161. The inclined outer peripheral surface 162C of the tapered portion 162B is formed to be inclined toward the axis O-O that is the rotation center of the rotation shaft 41.

Reference numeral 163 denotes a feed tube arranged on the inner peripheral side of the rotary shaft 161, and a tip end side of the feed tube 163 serves as a small diameter nozzle 163A, and a male mounting shaft portion 162.
Protruding from the tip side.

Reference numeral 164 denotes a rotary atomizing head according to this embodiment, and the rotary atomizing head 164 is an atomizing head main body 165 described later.
And a hub member 167. The atomizing head main body 165 is provided with the coating film thinning surface 165A, the discharge edge 165B, the nozzle insertion hole 165C, and the tube portion 165D, as in the rotary atomizing head 44 according to the third embodiment.

Reference numeral 166 denotes the cylindrical portion 16 of the atomizing head main body 165.
In the female mounting cylinder portion according to the present embodiment provided in 5D, the female mounting cylinder portion 166 is a bottomed fitting hole 166A. Further, in the fitting hole 166A, as shown in FIG. 21, an inclined inner peripheral surface 166B whose diameter gradually increases toward the rear side is formed. Here, the inclined inner peripheral surface 166B is the atomization head main body 16
5 is formed so as to incline toward the axis O-O, which is the center of rotation of the No. 5, and corresponds to the inclined outer peripheral surface 162C of the male mounting shaft portion 162.

Reference numeral 167 denotes a disk-shaped hub member provided on the paint thinning surface 165A side of the atomizing head main body 165, and the hub member 167 has the same shape as the hub member 47 of the third embodiment. A first hub hole 167A and a second hub hole 167B are formed.

168 is a fitting hole 166 of the female mounting cylinder portion 166.
The ring fitting groove 168 is annularly recessed in A, and the ring fitting groove 168 is recessed at a position facing a ring engaging step 170 described later on the opening side of the fitting hole 166A, and It opens inward.

Reference numeral 169 denotes an outer peripheral surface 162 of the cylindrical portion 162A.
The narrow width reduced groove portion provided in D is shown, and the narrow width reduced groove portion 1 is shown.
69 is annularly recessed so as to open radially outward at a position facing the ring fitting groove 168.

Reference numeral 170 denotes a ring engaging stepped portion provided in the narrow width reducing groove portion 169, and the ring engaging stepping portion 170 is formed in an inclined surface shape whose diameter gradually increases toward the front end side.

Reference numeral 171 is an O-ring mounted in the ring fitting groove 168, and the O-ring 171 is the ring engaging step portion 17
It is pressed against 0.

Thus, also in the present embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the third embodiment described above.

Next, FIG. 22 and FIG. 23 show the first embodiment of the present invention.
The present embodiment is characterized in that a second ring fitting groove axially separated from the first ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder of the rotary shaft. The second ring fitting groove is configured to fit the second elastic ring.

In the figure, reference numeral 181 denotes a rotary shaft according to this embodiment, and the rotary shaft 181 is a rotary shaft 61 according to the fourth embodiment.
Similarly to the above, it is formed hollow and rotates at a high speed with an axis O-O. A female mounting cylinder 182 is provided on the tip side of the rotary shaft 181, and the female mounting cylinder 182 serves as a stepped fitting hole 182A, and an end surface 182B is formed on the inner side of the fitting hole 182A. Has been formed.

Reference numeral 183 is a feed tube arranged on the inner peripheral side of the rotary shaft 181, and the tip side of the feed tube 183 is a small diameter nozzle 183A. The nozzle 183A projects from the tip side of the female mounting cylinder 182.

Reference numeral 184 denotes a rotary atomizing head according to this embodiment, and the rotary atomizing head 184 is an atomizing head main body 185 described later.
And a hub member 187. The atomizing head main body 185 is the atomizing head main body 65 according to the fourth embodiment.
Similarly to the coating thin film surface 185A, the discharge edge 185B,
A nozzle insertion hole 185C and a cylinder portion 185D are provided.

Reference numeral 186 denotes a male mounting shaft portion according to the present embodiment provided on the rear side of the atomizing head main body 185. The male mounting shaft portion 186 has a small diameter cylindrical shape extending toward the rear side as shown in FIG. Is formed in. The rear end surface 186A of the male mounting shaft portion 186 is in contact with the end surface 182B of the female mounting cylindrical portion 182.

Reference numeral 187 denotes a disk-shaped hub member provided on the paint thinning surface 185A side of the atomizing head main body 185. The hub member 187 has a first hub hole 187A and a second hub hole 1
87B is formed.

188 is a first ring fitting groove provided in the fitting hole 182A of the rotary shaft 181, and 189 is a second ring fitting groove axially separated from the first ring fitting groove 188. The ring fitting grooves 188 and 189 are annularly recessed so as to open radially inward.

Reference numeral 190 denotes a narrow width reducing groove portion provided on the outer peripheral surface of the male mounting shaft portion 186, and the narrow width reducing groove portion 190 is
A ring engagement step 191 described later is formed at a position facing the first ring fitting groove 188.

Reference numeral 191 denotes a ring engaging step portion formed in the narrow diameter reducing groove portion 190. The ring engaging step portion 191 is located at the rear end of the rotary shaft 181 at a position facing the first ring fitting groove 188. It is formed in an inclined surface shape in which the diameter gradually increases toward the side.

Reference numeral 192 denotes the male mounting shaft portion 1 of the atomizing head main body 185.
The ring contact surface 192 is formed on the rear side of 86, and the ring contact surface 192 forms the outer peripheral surface of the male mounting shaft portion 186.

Reference numeral 193 is a first O-ring fitted in the first ring fitting groove 188, and the O-ring 193 is pressed against the ring engaging step 191.

Reference numeral 194 denotes a second O-ring fitted in the second ring fitting groove 189, and the O-ring 194 is pressed against the ring contact surface 192.

Thus, also in the present embodiment having such a configuration, it is possible to obtain substantially the same operational effects as the above-described fourth embodiment.

Next, FIGS. 24 to 25 show the first embodiment of the present invention.
The first embodiment is characterized in that the present embodiment is characterized in that ring fitting grooves are provided at two positions on the inner peripheral surface of the female mounting cylinder of the rotary shaft.
A ring engaging step is provided on the outer peripheral surface of the male mounting shaft of the rotary atomizing head at a position facing the ring fitting groove.

In the figure, reference numeral 201 denotes a rotary shaft according to the present embodiment, and the rotary shaft 201 is a rotary shaft 81 according to the fifth embodiment.
Similarly to the above, it is formed hollow and rotates at a high speed with an axis O-O. A female mounting cylinder portion 202 is provided on the tip side of the rotary shaft 201.
The inner peripheral side of the is a stepped fitting hole 202A.

Reference numeral 203 denotes a feed tube arranged on the inner peripheral side of the rotary shaft 201, and the tip side of the feed tube 203 is a small diameter nozzle 203A. The nozzle 203A projects from the tip end side of the female mounting cylinder portion 202.

Reference numeral 204 denotes a rotary atomizing head according to this embodiment, and the rotary atomizing head 204 is an atomizing head main body 205 described later.
And a hub member 207. Further, the atomizing head main body 205 is provided with a paint film thinning surface 205A, a discharge edge 205B, a nozzle insertion hole 205C, and a tubular portion 205D, as in the atomizing head main body 85 according to the fifth embodiment.
Reference numeral 206 denotes a male mounting shaft portion according to the present embodiment, which is provided on the cylindrical portion 205D of the atomizing head main body 205.
On the outer peripheral surface 206A, a wide-width reduced-diameter groove portion 210, ring engagement step portions 211 and 212, which will be described later, are formed.

Reference numeral 207 denotes a disk-shaped hub member provided on the paint thinning surface 205A side of the atomizing head main body 205. The hub member 207 has a first hub hole 207A and a second hub hole 2
07B is formed.

Numeral 208 is a first ring fitting groove provided in the fitting hole 202A of the female mounting cylinder portion 202 located on the tip side of the rotary shaft 201, and 209 is an axial direction from the first ring fitting groove 208. In the second ring fitting groove spaced apart from each other, each of the ring fitting grooves 208, 209 is annularly recessed so as to open inward in the radial direction.

Reference numeral 210 denotes the outer peripheral surface 206 of the male mounting shaft portion 206.
A wide reduced diameter groove portion provided in A and extending in the axial direction is shown, and first and second ring engaging step portions 211 and 212 are formed on both axial ends of the wide reduced diameter groove portion 210. here,
The first ring engaging stepped portion 211 is located on the front end side of the wide diameter reduced groove portion 210 and is formed in an inclined surface shape whose diameter is gradually reduced toward the rear end side. In addition, the second ring engagement step portion 212
Is located on the rear end side of the wide-width reduced-diameter groove portion 210, and is formed in an inclined surface shape in which the diameter is gradually reduced toward the front end side.

Reference numeral 213 is a first O-ring fitted in the first ring fitting groove 208, and the O-ring 213 is pressed against the ring engaging step portion 211. Also, 214 is the second
The second O-ring 214 is fitted in the ring fitting groove 209 of the above, and the O-ring 214 is pressed against the ring engaging step portion 212.

Thus, also in the present embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the fifth embodiment described above.

Next, FIG. 26 and FIG. 27 show the first embodiment of the present invention.
The second embodiment is characterized in that the inclined inner peripheral surface is formed on the inner peripheral surface of the female mounting cylinder portion of the rotary shaft, and the female mounting cylindrical portion is formed on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head. The structure is such that the inclined outer peripheral surface corresponding to the inclined inner peripheral surface is formed and the ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder portion.

In the figure, reference numeral 221 denotes the rotary shaft according to the present embodiment, and the rotary shaft 221 has the rotary shaft 10 according to the sixth embodiment.
Like No. 1, it is formed hollow and rotates at a high speed with an axis O-O.

Reference numeral 222 denotes a female mounting cylinder portion according to the present embodiment, which is provided on the tip side of the rotary shaft 221, and the inner peripheral side of the female mounting cylinder portion 222 has a diameter gradually increased toward the tip side of the rotary shaft 221. It is a dowel hole 222A. Further, on the inner peripheral side of the fitting hole 222A, as shown in FIG. 26, an inclined inner peripheral surface 222B which is inclined toward the axis O-O which is the center of rotation of the rotary shaft 221 is formed.

Reference numeral 223 is a feed tube arranged on the inner peripheral side of the rotary shaft 221, and the tip end side of the feed tube 223 is a small diameter nozzle 223A. The nozzle 223A extends in the axial direction toward the tip side of the rotary shaft 101 and projects from the tip side of the female mounting tube portion 222.

Reference numeral 224 denotes a rotary atomizing head according to this embodiment, and the rotary atomizing head 224 is an atomizing head main body 225 described later.
And a hub member 227. The atomizing head body 225 is the atomizing head body 1 according to the sixth embodiment.
05, the paint thin film surface 205A, the discharge edge 205
B, a nozzle insertion hole 205C, and a tubular portion 205D are provided.

Reference numeral 226 denotes a cylindrical portion 205D of the rotary atomizing head 224.
26 is a male mounting shaft portion serving as a mounting cylinder portion, and the male mounting shaft portion 226 includes a cylindrical portion 226A having the same diameter as the rotary shaft 221 and a rear portion side of the cylindrical portion 226A as shown in FIG. It is formed of a tapered portion 226B that is positioned and gradually reduced in diameter toward the rear side of the rotary shaft 221. The tapered outer peripheral surface 226C of the tapered portion 226B is formed so as to face the axis O-O that is the center of rotation of the rotating shaft 221 and to correspond to the inclined inner peripheral surface 222B of the female mounting cylinder portion 222 of the rotating shaft 221. .

Reference numeral 227 denotes a disk-shaped hub member provided on the paint thinning surface 225A side of the atomizing head main body 225. The hub member 227 has a first hub hole 227A and a second hub hole 2
27B is formed.

Reference numeral 228 is a fitting hole 222 of the female mounting tube portion 222.
The ring fitting groove 228 is annularly recessed in A, and the ring fitting groove 228 is annularly recessed so as to open radially inward at a position facing a ring engaging step portion 230 described later. .

Reference numeral 229 denotes the outer peripheral surface 226 of the cylindrical portion 226A.
The narrow width reduced groove portion provided in D is shown, and the narrow width reduced groove portion 2 is shown.
29 is annularly provided so as to open radially outward at a position facing the ring fitting groove 228.

Reference numeral 230 denotes a ring engaging stepped portion provided in the narrow diameter reducing groove portion 229, and the ring engaging stepping portion 230 is formed in an inclined surface shape whose diameter gradually increases toward the rear end side.

Reference numeral 231 is an O-ring mounted in the ring fitting groove 228, and the O-ring 231 is the ring engaging step portion 23.
It is pressed against 0.

Thus, also in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as the sixth embodiment described above.

In each of the above embodiments, the elastic holding member is exemplified by an O-ring having a circular cross section or an elliptical cross section, but other shapes such as a polygonal shape may be used.

In each of the above embodiments, the case where the atomizing head main body is formed in a bell shape is illustrated, but the atomizing head main body has a cylindrical shape whose diameter increases from the rotary shaft insertion portion toward the discharge end edge. You may form in.

Further, in each of the above embodiments, the case where the atomizing head main body is made of an aluminum alloy has been exemplified.
The atomizing head body may be made of a resin material.

[0248]

As described in detail above, according to the invention of claim 1, when the mounting cylinder portion of the rotary atomizing head is mounted on the mounting shaft portion of the rotary shaft, it is fitted in the ring fitting groove. By elastically deforming the elastic ring between the mounting cylinder part and the mounting shaft part, the rotary atomizing head can be held by the elastic force of the elastic ring with respect to the rotating shaft.

Therefore, according to the present invention, the rotary atomizing head can be attached and detached without using a separate tool as in the prior art, and the assembling property at the time of manufacturing can be improved and the productivity can be improved. it can. Also, installation of the rotary atomizing head,
Since it is easy to remove, the workability when cleaning the rotary atomizing head can be improved.

Furthermore, by holding the mounting cylinder portion of the rotary atomizing head on the mounting shaft portion of the rotary shaft by the elastic force of the elastic ring, the center of rotation of the rotary atomizing head is aligned with the center of rotation of the rotary shaft. You can This makes it possible to maintain a good rotational balance after reattaching the rotary atomizing head, and improve the assembling workability by omitting the readjustment work of the rotational balance.

According to the second aspect of the present invention, the ring fitting groove is provided on the outer peripheral surface of the male mounting shaft portion of the rotary shaft, and the ring engaging step portion is provided on the inner peripheral surface of the female mounting cylinder portion of the rotary atomizing head. Thereby, the elastic ring can be pressed and engaged with the ring engaging step portion. Thus, the rotary atomizing head can be held in a state of being retained with respect to the rotary shaft by the resistance force of the elastic ring.

According to the third aspect of the invention, another ring fitting groove is provided on the outer peripheral surface of the male mounting shaft portion of the rotary shaft at a position axially separated from the ring fitting groove, and the other ring fitting groove is provided. By attaching another elastic ring to the, the rotary atomizing head is retained by the elastic ring fitted in the ring fitting groove and the other elastic ring fitted in the other ring fitting groove. You can

According to the invention of claim 4, a ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head, and a ring engaging step is provided on the outer peripheral surface of the male mounting shaft of the rotary shaft. . Also in the invention of claim 4, substantially the same effect as that of the invention of claim 2 described above can be obtained.

According to a fifth aspect of the present invention, another ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head at a position axially separated from the ring fitting groove, and the other ring fitting groove is provided. Another elastic ring is fitted in the groove. Also in the invention of claim 5, it is possible to obtain substantially the same effect as in claim 3 described above.

According to the sixth aspect of the present invention, the ring fitting grooves are axially spaced from each other and provided at two positions on the outer peripheral surface of the male mounting shaft portion of the rotary shaft, and on the inner peripheral surface of the female mounting cylindrical portion of the rotary atomizing head. Is provided with a wide-width expanding groove portion and ring engaging step portions are provided at both ends in the axial direction of the wide-width expanding groove portion, so that the two elastic rings can be pressed and engaged with the respective ring engaging step portions. . As a result, the rotary atomizing head can be prevented from coming off from the rotary shaft by the resistance force of the two elastic rings.

According to a seventh aspect of the present invention, the ring fitting grooves are axially spaced from each other and provided at two locations on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head, and the outer peripheral surface of the male mounting shaft of the rotary shaft is wide. The reduced diameter groove portion is provided, and the ring engagement step portions are provided at both axial ends of the wide reduced diameter groove portion. Also in the invention of claim 7,
It is possible to obtain substantially the same effect as that of the invention of claim 6 described above.

According to the eighth aspect of the present invention, the inclined outer peripheral surface is provided on the male mounting shaft portion of the rotary shaft, and the inclined inner peripheral surface is provided on the female mounting cylinder portion of the rotary atomizing head. Is brought into contact with the inclined inner peripheral surface of the female mounting cylinder portion. As a result, the rotary atomizing head can be oriented to the center of rotation of the rotary shaft by its inclined outer peripheral surface, so that the rotary atomizing head can be automatically positioned at the center of rotation of the rotary shaft, and the rotary balance after mounting the rotary atomizing head Can be further improved, and the readjustment work of the rotational balance can be omitted.

According to the invention of claim 9, a ring fitting groove is provided on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head, and a ring engaging step portion is provided on the inner peripheral surface of the female mounting cylinder portion of the rotating shaft. The elastic ring can be pressed against and engaged with the ring engaging step portion, and the rotary atomizing head can be prevented from coming off.

According to the tenth aspect of the invention, another ring fitting groove is provided on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head at a position axially separated from the ring fitting groove, and the other ring fitting groove is provided. The rotary atomizing head can be prevented from being pulled out by fitting another elastic ring into the fitting groove.

According to the invention of claim 11, a ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder portion of the rotary shaft, and a ring engaging step portion is provided on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head. . Also in the invention of claim 11, almost the same effect as the invention of claim 9 described above can be obtained.

According to the twelfth aspect of the present invention, another ring fitting groove is provided at a position axially separated from the ring fitting groove on the inner peripheral surface of the female mounting cylinder of the rotary shaft, and the other ring fitting groove is provided. Another elastic ring is fitted in the groove. Also in the invention of claim 12, almost the same effect as in claim 10 can be obtained.

According to the thirteenth aspect of the invention, the ring fitting groove is axially separated from the outer surface of the male mounting shaft portion of the rotary atomizing head.
The elastic force of the two elastic rings is provided by providing a wide-diameter expanding groove portion on the inner peripheral surface of the female mounting cylinder portion of the rotary shaft and providing ring engaging step portions at both axial ends of the wide-diameter expanding groove portion. The rotary atomizing head can be retained by the rotary shaft.

According to a fourteenth aspect of the present invention, the ring fitting grooves are axially spaced from each other and provided at two locations on the inner peripheral surface of the female mounting cylinder portion of the rotary shaft, and the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head has a wide width. The reduced diameter groove portion is provided, and the ring engagement step portions are provided at both axial ends of the wide reduced diameter groove portion. Also in the invention of claim 14, almost the same effect as that of the invention of claim 13 can be obtained.

According to the fifteenth aspect of the present invention, the male mounting shaft portion of the rotary atomizing head is provided with the inclined outer peripheral surface, the female mounting cylinder portion of the rotating shaft is provided with the inclined inner peripheral surface, and the inclined outer peripheral surface of the mounting shaft portion is provided. Is brought into contact with the inclined inner peripheral surface of the female mounting cylinder portion. As a result, the rotary atomizing head can be oriented to the center of rotation of the rotary shaft by its inclined inner peripheral surface, so that the rotary atomizing head can be automatically positioned at the center of rotation of the rotary shaft, and the rotary atomizing head can be rotated after mounting. The balance can be further improved, and the readjustment work of the rotational balance can be omitted.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rotary shaft and a rotary atomizing head according to a first embodiment.

FIG. 2 is a cross-sectional view showing a state in which a rotary atomizing head is removed from a rotary shaft.

FIG. 3 is an enlarged cross-sectional view of an essential part showing an arrow A portion in FIG. 1 in an enlarged manner.

FIG. 4 is an enlarged cross-sectional view of a main part similar to FIG. 3, showing a state in which the rotary atomizing head according to the first embodiment is rotated at high speed.

FIG. 5 is a sectional view showing a rotary shaft and a rotary atomizing head according to a second embodiment.

FIG. 6 is an enlarged cross-sectional view of a main part showing an arrow B portion in FIG. 5 in an enlarged manner.

FIG. 7 is an enlarged cross-sectional view of an essential part similar to FIG. 6, showing a state in which the rotary atomizing head according to the second embodiment is rotated at high speed.

FIG. 8 is a sectional view showing a rotary shaft and a rotary atomizing head according to a third embodiment.

FIG. 9 is an enlarged cross-sectional view of an essential part showing an enlarged C portion indicated by an arrow in FIG.

FIG. 10 is a sectional view showing a rotary shaft and a rotary atomizing head according to a fourth embodiment.

FIG. 11 is an enlarged cross-sectional view of an essential part showing an enlarged portion D of FIG.

FIG. 12 is a sectional view showing a rotary shaft and a rotary atomizing head according to a fifth embodiment.

FIG. 13 is an enlarged cross-sectional view of an essential part showing an arrow E portion in FIG. 12 in an enlarged manner.

FIG. 14 is a sectional view showing a rotary shaft and a rotary atomizing head according to a sixth embodiment.

FIG. 15 is an enlarged cross-sectional view of an essential part showing an arrow F portion in FIG. 14 in an enlarged manner.

FIG. 16 is a sectional view showing a rotary shaft and a rotary atomizing head according to a seventh embodiment.

FIG. 17 is an enlarged cross-sectional view of an essential part showing an enlarged G part indicated by an arrow in FIG.

FIG. 18 is a sectional view showing a rotary shaft and a rotary atomizing head according to an eighth embodiment.

FIG. 19 is an enlarged sectional view of an essential part showing an arrow H portion in FIG. 18 in an enlarged manner.

FIG. 20 is a sectional view showing a rotary shaft and a rotary atomizing head according to a ninth embodiment.

FIG. 21 is an enlarged sectional view of an essential part showing an enlarged view of an arrow I portion in FIG. 20.

FIG. 22 is a sectional view showing a rotary shaft and a rotary atomizing head according to a tenth embodiment.

FIG. 23 is an enlarged sectional view of an essential part showing an enlarged J section indicated by an arrow in FIG. 22.

FIG. 24 is a sectional view showing a rotary shaft and a rotary atomizing head according to an eleventh embodiment.

FIG. 25 is an enlarged cross-sectional view of an essential part showing an arrow K portion in FIG. 24 in an enlarged manner.

FIG. 26 is a sectional view showing a rotary shaft and a rotary atomizing head according to a twelfth embodiment.

27 is an enlarged sectional view of an essential part showing an enlarged L part indicated by an arrow in FIG. 26. FIG.

FIG. 28 is a sectional view showing a rotary atomizing head type coating apparatus according to the prior art.

FIG. 29 is an enlarged sectional view of an essential part showing a rotary shaft and a rotary atomizing head of a rotary atomizing head type coating device according to a conventional technique.

[Explanation of symbols]

1, 21, 41, 61, 81, 101, 121, 14
1,161,181,201,221 Rotating shafts 2,22,42,122,142,162 Male mounting shaft part (mounting shaft part) 4,24,44,64,84,104,124,14
4,164,184,204,224 Rotating atomizing head 6,26,46,126,146,166 Female mounting cylinder part (mounting cylinder part) 8,9,28,29,48,68,69,88,89 ，
108, 128, 129, 148, 149, 168, 1
88, 189, 208, 209, 228 Ring fitting groove 30, 90 Wide diameter expanding groove portion 11, 31, 32, 50, 71, 91, 92, 110,
131, 151, 152, 170, 191, 211, 2
12,230 Ring engaging step portions 13, 14, 33, 34, 51, 73, 74, 93, 9
4,111,133,134,153,154,17
1,193,194,213,214,231 O-ring (elastic ring) 42C, 106C, 162C, 226C inclined outer peripheral surfaces 46C, 102C, 166B, 222B inclined inner peripheral surfaces 62, 82, 102, 182, 202, 222 female mounting Cylindrical part (mounting shaft part) 66, 86, 106, 186, 206, 226 Male mounting shaft part (mounting cylinder part) 130, 169, 190, 229 Narrow width reduction groove part 150, 210 Wide reduction groove part OO axis (Rotation center)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B05B 3/00-3/18 B05B 5/00-5/16

Claims (15)

(57) [Claims] 1. An air motor that rotates at high speed by supplying air, a rotary shaft whose axial base end side is rotatably supported by the air motor, and a distal end side of which protrudes outside the air motor to serve as a mounting shaft portion, and a front portion. A rotary atomizing head type coating device comprising a rotary atomizing head whose side is formed in a bell shape and whose rear side is a mounting cylinder portion to be mounted on the mounting shaft portion of the rotary shaft. A ring fitting groove provided on either one of the mounting cylinder portion of the atomizing head and the other side of the mounting shaft portion of the rotating shaft and the mounting cylinder portion of the rotary atomizing head, And a ring engaging step provided at a position facing the ring engaging groove, and the ring engaging step fitted in the ring engaging groove and having a rotary atomizing head attached to the rotary shaft. The rotary atomizing head can be attached and detached by elastically engaging the part. A rotary atomizing head type coating device comprising an elastic ring held by 2. The mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, the mounting barrel portion of the rotary atomizing head is formed as a female mounting barrel portion, and the ring fitting groove is formed as a male portion of the rotary shaft. 2. The rotary atomizing head type coating device according to claim 1, wherein the rotary shaft is provided on an outer peripheral surface of the mounting shaft portion, and the ring engaging step portion is provided on an inner peripheral surface of a female mounting cylinder portion of the rotary atomizing head. 3. Another ring fitting groove is provided on the outer peripheral surface of the male mounting shaft portion of the rotary shaft at a position axially separated from the ring fitting groove, and the other ring fitting groove is provided with another ring fitting groove. The rotary atomizing head type coating device according to claim 2, wherein an elastic ring is fitted and provided, and a ring contact surface with which the elastic ring abuts is provided on an inner peripheral surface of the female mounting cylinder portion. 4. The mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, the mounting cylinder portion of the rotary atomizing head is formed as a female mounting cylinder portion, and the ring fitting groove is the rotary atomizing head. 2. The rotary atomizing head type coating device according to claim 1, wherein the female mounting cylinder portion is provided on an inner peripheral surface thereof, and the ring engaging step portion is provided on an outer peripheral surface of a male mounting shaft portion of the rotating shaft. 5. Another ring fitting groove is provided on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head at a position axially separated from the ring fitting groove, and the other ring fitting groove is provided in the other ring fitting groove. The rotary atomizing head type coating device according to claim 4, wherein another elastic ring is fitted and provided, and a ring contact surface with which the elastic ring abuts is provided on the outer peripheral surface of the male mounting shaft portion. 6. The mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, the mounting cylinder portion of the rotary atomizing head is formed as a female mounting cylinder portion, and the ring fitting groove is axially separated. Is provided at two locations on the outer peripheral surface of the male mounting shaft portion of the rotary shaft, and a wide diameter expanding groove portion extending in the axial direction is provided on the inner peripheral surface of the female mounting cylinder portion of the rotary atomizing head, and the ring engaging step portion is provided with the wide width. The rotary atomizing head type coating device according to claim 1, wherein the enlarged diameter groove portion is provided at each of both ends in the axial direction. 7. The mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, the mounting cylinder portion of the rotary atomizing head is formed as a female mounting cylinder portion, and the ring fitting groove is axially separated. Is provided at two locations on the inner peripheral surface of the female mounting cylinder of the rotary atomizing head, and a wide diameter reducing groove portion extending in the axial direction is provided on the outer peripheral surface of the male mounting shaft of the rotary shaft, and the ring engaging step portion has the wide width. The rotary atomizing head type coating device according to claim 1, wherein the reduced diameter groove portion is provided at each of both ends in the axial direction. 8. The rotary atomizing head, wherein the mounting shaft portion of the rotary shaft is formed as a male mounting shaft portion, and the male mounting shaft portion is provided with an inclined outer peripheral surface whose outer peripheral surface is inclined toward the center of rotation. 2. The rotary atomizing head according to claim 1, wherein the mounting cylinder portion is formed as a female mounting cylinder portion, and the female mounting cylinder portion has an inner peripheral surface provided with an inclined inner peripheral surface corresponding to the inclined outer peripheral surface. Type coating equipment. 9. The mounting shaft portion of the rotary shaft is formed as a female mounting cylinder portion, the mounting cylinder portion of the rotary atomizing head is formed as a male mounting shaft portion, and the ring fitting groove is the rotary atomizing head. 2. The rotary atomizing head type coating device according to claim 1, wherein the male mounting shaft portion is provided on an outer peripheral surface thereof, and the ring engaging step portion is provided on an inner peripheral surface of a female mounting cylinder portion of the rotating shaft. 10. Another ring fitting groove is provided at a position axially separated from the ring fitting groove on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head, and the other ring fitting groove is provided in the other ring fitting groove. The rotary atomizing head type coating device according to claim 9, wherein another elastic ring is fitted and provided, and a ring contact surface with which the elastic ring abuts is provided on the inner peripheral surface of the female mounting cylinder portion. 11. The mounting shaft portion of the rotary shaft is formed as a female mounting cylinder portion, the mounting barrel portion of the rotary atomizing head is formed as a male mounting shaft portion, and the ring fitting groove is formed in the female shaft of the rotating shaft. The rotary atomizing head type coating device according to claim 1, wherein the ring engaging step portion is provided on an inner peripheral surface of the mounting cylinder portion, and the ring engaging step portion is provided on an outer peripheral surface of a male mounting shaft portion of the rotary atomizing head. 12. Another ring fitting groove is provided at a position axially separated from the ring fitting groove on the inner peripheral surface of the female mounting cylinder portion of the rotary shaft, and the other ring fitting groove is provided with another ring fitting groove. The rotary atomizing head type coating device according to claim 11, wherein an elastic ring is fitted and provided, and a ring contact surface with which the elastic ring abuts is provided on the outer peripheral surface of the male mounting shaft portion. 13. The mounting shaft portion of the rotary shaft is formed as a female mounting cylinder portion, the mounting cylinder portion of the rotary atomizing head is formed as a male mounting shaft portion, and the ring fitting groove is axially separated. Is provided at two locations on the outer peripheral surface of the male mounting shaft portion of the rotary atomizing head, and a wide diameter expanding groove portion extending in the axial direction is provided on the inner peripheral surface of the female mounting cylinder portion of the rotating shaft, and the ring engaging step portion is provided with the wide width. The rotary atomizing head type coating device according to claim 1, wherein the enlarged diameter groove portion is provided at each of both ends in the axial direction. 14. The mounting shaft portion of the rotary shaft is formed as a female mounting cylinder portion, the mounting cylinder portion of the rotary atomizing head is formed as a male mounting shaft portion, and the ring fitting grooves are axially separated from each other. Is provided at two locations on the inner peripheral surface of the female mounting cylinder of the rotary shaft, and a wide diameter reducing groove portion extending in the axial direction is provided on the outer peripheral surface of the male mounting shaft of the rotary atomizing head, and the ring engaging step portion has the wide width. The rotary atomizing head type coating device according to claim 1, wherein the reduced diameter groove portion is provided at each of both ends in the axial direction. 15. The rotating shaft mounting shaft portion is formed as a female mounting cylinder portion, and the female mounting cylinder portion is provided with an inclined inner peripheral surface whose inner peripheral surface is inclined toward a rotation center. The rotary atomization according to claim 1, wherein the mounting cylinder portion of the keratinized head is formed as a male mounting shaft portion, and the male mounting shaft portion is provided with an inclined outer peripheral surface corresponding to the inclined inner peripheral surface on the outer peripheral surface thereof. Head type coating equipment.