JPH0810402Y2 - Rotating device for coated objects - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a rotating device for an object to be coated, which is adapted to dry a coating film while rotating an object to be coated such as a bumper of an automobile.

Conventional technology In order to give a car a high-class appearance, the degree of painting of the body etc. is very important, and each automobile manufacturer has developed a coating technology to improve the efficiency of the painting as well as to give a high-class feeling. Instead of a conventional sheet metal bumper, a synthetic resin shock absorbing bumper is used, and painting is applied to this bumper to enhance the luxury of the automobile. The coating process of a synthetic resin bumper generally includes a cleaning process, a masking process, a base coating and drying process, a top coating and a drying process.

In order to maintain the quality of painting, it is important to suppress painting defects as much as possible. One type of this painting defect is the "dripping" of paint that occurs when painting on a vertical or inclined surface of the object to be coated.
There is. The reason for the sagging is that the film thickness of the paint is too thick or the viscosity is low, and a part of the paint flows down for several millimeters, and the coating film rises at the part where the flow is stopped and becomes a sagging pattern.
As a measure to prevent this sagging, reduce the film thickness,
There are methods such as increasing the viscosity of the paint or speeding up the drying, but a method of rotating the object to be coated for a required time immediately after coating is also effective in preventing sagging.

For example, Japanese Utility Model Laid-Open No. 63-126063 discloses a technique for rotating a body of an automobile while the body of the automobile is being conveyed by the carrier, which is referred to as a carrier for a coating line. Further, in JP-A-63-258678, after gradually increasing the rotation speed of a body to be coated such as an automobile body around a horizontal axis from a rotation stopped state to a predetermined rotation speed, the predetermined rotation speed is increased. A coating method is disclosed which includes a drying step of rotating with it.

Problems to be Solved by the Invention The technique described in the above-mentioned publication is applied to a large object to be coated such as an automobile body, and has a problem that the device becomes complicated and the cost of the device increases.

The present invention has been made in view of these points,
The purpose of the invention is to provide a rotating device for an object to be coated, which can prevent dripping of the paint by preventing abrupt rotation with a simple structure when the object to be dried is rotated. is there.

Means for Solving the Problems In order to achieve the above-mentioned object, a rotating device for an object to be coated of the present invention includes a carrier frame conveyed by a conveying means and an object to be coated rotatably attached to the carrier frame. The workpiece holding member for holding, a rail provided along the transport direction, and a truncated cone-shaped roller means fixed to the workpiece holding member so as to roll on the rail. To be done. Then, at the beginning of the paint drying process, the rail position is set so that the large diameter portion of the roller means comes into contact with the rail, and then the rail position is gradually changed so that the small diameter portion of the roller means comes into contact with the rail. It is characterized by changing to.

Action At the beginning of the coating material drying process, the rail position is set so that the large diameter portion of the truncated cone-shaped roller means comes into contact with the rail. The object-to-be-coated holding member which is fixed is rotated at a slow speed. This effectively prevents the paint from dripping due to the centrifugal force when it is rotated rapidly. When the drying progresses to some extent, the small diameter portion of the roller means comes into contact with the rail, so that the rotation speed of the roller means increases and the rotation speed of the object-to-be-coated holding member to which the roller means is fixed increases. The coated surface can be beautifully finished by drying the coated object while rotating it at a certain speed.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the present invention, in which two objects to be coated are rotated and held by a rotating device of the present invention and are indicated by arrows a
It is shown being conveyed in the direction. Figure 1 (A)
Is the first position in the paint drying step, and position (B) shows the state in the drying furnace when the drying has progressed to some extent. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG.

In these figures, 2 is a rail formed of a round bar, which is attached to the wall 8 of the drying furnace by attaching members 4 and 6. The rail 2 has an introduction rail portion 2a corresponding to an introduction portion of a drying furnace having a narrow opposing rail spacing, a transition portion 2b having a gradually increasing spacing, and a steady drying in which the opposing rail spacing is wider than that of the introduction rail portion 2a. And a stationary rail portion 2c that performs A guide rail 10 formed of a pair of rail members 12, 12 is provided at a substantially central portion of the pair of rails 2, 2 along the transport direction.

Reference numeral 14 is a carrier frame which is conveyed in the direction of arrow a by a conveying means which will be described later. The carrier frame 14 is provided with an elongated slot 15 in the vertical direction as best shown in FIGS. 5 and 6. The rotary shaft 16 penetrates the elongated hole 15 in the lateral direction. A frustoconical roller 18 is fixed to the outer end of the rotary shaft 16, and its inner end is fixed to a rotary frame (member to be coated holding member) 20 that rotates with respect to the carrier frame 14. The roller 18 is made of, for example, silicone resin, and its diameter is reduced from the inner side to the outer side. An object to be coated 22 such as a bumper is held on the rotating frame 20. The rotary frame 20 is supported by the roller 18 abutting on the rail 2. When the roller 18 rolls on the rail 2, the rotary frame 20 is horizontally rotated around the axis of the rotary shaft 16.

Referring to FIG. 4, a side view of FIG. 1 is shown, and FIGS. 4 (A) and (B) correspond to portions (A) and (B) of FIG. 1, respectively. Reference numeral 24 is a chain that is rotationally driven by a driving means (not shown), and a dog 26 is fixed to the chain. 28 is a pulling roller unit that is guided on the guide rail 10. When the dog 30 provided on the pulling roller unit 28 engages with the dog 26 of the chain 24, the pulling roller unit 28 is pulled rightward in the figure. To be done. The pulling roller unit 28 is connected to the carriage 32 by a connecting member 34, and the carriage 32 connects the carrier frame 14 via the connecting portion 14a.
It is connected to. In the housing 36 of the carriage 32, a roller 38 that is guided on the guide rail 10 is accommodated.

However, in the first part of the drying process, as shown in FIG. 1, since the interval between the introduction rail portions 2a is set to be narrow, the rail 2 is positioned in contact with the large diameter portion of the roller 18 and When the large-diameter portion rolls on the rail 2, the rotation speed of the roller 18 is small, so that the rotating frame 20 and the object to be coated 22 are conveyed in the direction of the arrow a while being slowly rotated, and the paint is dried. Therefore, the paint is not biased in one direction by the centrifugal force, and the paint is prevented from sagging. At this time, the rotating shaft 16 is located in the upper portion of the elongated hole 15 of the carrier frame 14.

As the conveyance proceeds in the a direction, the roller 18 moves to the transition rail portion 2b.
When the roller 18 contacts the rail 2, the contact position between the roller 18 and the rail 2 gradually changes in the small diameter direction of the roller 18, and when the roller 18 is conveyed to the steady rail portion 2c, the small diameter portion of the roller 18 rolls on the rail 2. Like At this time, the rotary shaft 16 is the carrier frame.
Move from the top to the bottom in the slotted hole 15 of 14. As a result, the rotation speed of the roller 18 increases, and the rotation speed of the rotating frame 20 directly connected to the roller 18 also increases. Therefore, the object to be coated 22 is conveyed in the direction of the arrow a and dried while performing the steady rotation increased from the introduction portion of the drying furnace, and the coated surface can be finished beautifully. In FIG. 4, reference numeral 40 indicates the locus of the rotary shaft 16.

In the embodiment described above, the diameter of the roller 18 is formed so as to become smaller as it goes to the outside, but the present invention is not limited to this, and the shape of the roller is made larger so as to go to the outside. Good. In this case, the interval between the pair of rails is set wide in the first part of the drying furnace to slow down the rotation speed of the object to be coated, and then the interval between the rails is set narrow to increase the rotation speed of the object to be coated. You can do it like this.

Effect of the Invention As described in detail above, the present invention does not complicate the equipment because the position of the rail on which the frustoconical roller abuts can be set in advance in various ways in the drying furnace. The cost is low and the number of failures is small, and the object to be coated is prevented from being rapidly rotated in the first part of the drying process, so that the coating can be prevented from sagging and the coated surface can be finished beautifully.

[Brief description of drawings]

1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG. 1, and FIG. 4 is shown in FIG. FIG. 5 is a side view of the embodiment shown, FIG. 5 is an enlarged front view of the embodiment, and FIG. 6 is a side view of FIG. 2 ... Rail, 10 ... Guide rail, 14 ... Carrier frame, 16 ... Rotation axis, 18 ... Frustum-shaped roller, 20 ...
… Rotary frame (paint holding member), 22 …… Paint, 24 …… Chain, 28 …… Pulling roller unit, 32…
... a dolly.

Claims (1)

[Scope of utility model registration request] 1. A rotating device for a coated body, wherein a coating film is dried while rotating the coated body after completion of coating, the carrier frame being transported by a transport means, and rotatable on the carrier frame. The object-to-be-coated holding member that is attached to the object to hold the object-to-be-coated, the rail that is provided along the conveying direction, and the truncated cone-shaped member that is fixed to the object-to-be-coated holding member so as to roll on the rail. A roller means, and the position of the rail is set so that the large diameter portion of the roller means abuts the rail at the beginning of the paint drying process.
After that, the position of the rail is gradually changed so that the small diameter portion of the roller means comes into contact with the rail.