JPH031845Y2 - - Google Patents

Description

[Detailed explanation of the idea] 【Technical field】

The present invention relates to a band door for lighting equipment used for stage lighting and the like.

[Background technology]

As shown in FIGS. 8 and 9, the conventional band door has a fixing plate 5 fixed to the tip of the light projecting device.
and a rotary plate 3 rotatably attached to the outer periphery of the tip of the ring body 4 protruding from the fixed plate 5.
and a rotating shaft 2 forming a rectangular frame fixed to a rotating plate 3.
and a total of four blades 1 which are rotatably attached to each side of the rotating shaft 2 via fittings 10, respectively. The rotating shaft 2 is the 10th
As shown in the figure, a single bar is bent and welded at both ends to form a rectangular shape.
It was attached to the rotating plate 1 by welding the center of each side to the rotating plate 3. However, since the rotating shaft 2 is made into a rectangular shape by butting and welding both ends of the bar material, it is difficult to measure the side with this welded part, and it is difficult to make the rotating shaft 2 square. , and for this reason, it often became impossible to attach the blades 1 symmetrically. Also, when the rotating shaft 2 is welded to the rotating plate 3, misalignment tends to occur, and as a result, the center of the rotating shaft 2 does not coincide with the rotation center of the rotating plate 3, and the rotation center of the blade 1 becomes eccentric. It was hot.

[Purpose of invention]

The present invention has been devised in view of these points, and its purpose is to provide a band door for a projector with good symmetry of the blades and no misalignment of the center of rotation.

[Disclosure of invention]

However, the band door for light projecting equipment according to the present invention is
A rotary shaft bent into a frame shape, a rotary plate supporting the rotary shaft by a plurality of support parts bent around its periphery, and 4 rotatably attached to each side of the rotary shaft. The rotating shaft is formed by a combination of four L-shaped bent rods or two U-shaped bent rods, and The feature is that the end of each bar is located within the support part, and by supporting the rotating shaft with the bent support part formed on the periphery of the rotating plate, there is no need to weld the rotating shaft. In addition to being attached to the rotary plate, each end of a plurality of rods is positioned within the support part to serve as the rotation shaft, so that it can be assembled into a frame shape without welding. The present invention will be described in detail below based on the illustrated embodiment. As shown in FIGS.
and a rotary plate 3 rotatably attached to the outer periphery of the tip of the ring body 4 protruding from the fixed plate 5.
, a rotating shaft 2 forming an octagonal frame fixed to the rotating plate 3, and large and small rotating shafts 2 rotatably attached to every other side of the rotating shaft 2 via a pair of fixtures 10, 10, respectively. It consists of a total of four feathers 1 of the seed. As is clear from FIG. 3, the rotating shaft 2 here consists of four rods 20 bent in an L-shape.
It is made into a frame by combining the
Both ends of each bar 20 are fixed to the rotary plate 3. In addition, a rotary plate 3 is provided at the bent portion of each bar 20.
Oblique sides 21 are provided which are fixed at an angle of 45° to the two sides to which the blades 1 are attached. As shown in FIG. 3, the rotary plate 3, which has the edge of the central circular opening located in the annular groove 40 provided in the ring body 4, has an octagonal outer shape, and By bending and folding back the support portions 31, which are every other side, the rotating shaft 2 is supported at four locations. That is, each end of the four rods 20 forming the rotating shaft 2 is supported by the support portion 31. The fixture 10 for attaching each blade 1 to the rotating shaft 2 consists of a pair of pieces 11, 11 that sandwich the rotating shaft 2, as shown in FIGS. 5 and 6.
It is fixed to the blade 1 with screws 12. In this band door configured as described above, the rotating shaft 2 is attached to the rotating plate 3 by bending the rotating plate 3, which can achieve extremely high positional accuracy, instead of using welding. Therefore, the center of rotation of the frame-shaped rotating shaft 2 and the center of rotation of the rotating plate 3 will not deviate from each other. Since multiple bars 20 are combined into a bar shape without welding, just by maintaining the bending angle of each bar 20 accurately, the blade 1
It is possible to ensure the symmetry of Note that the oblique side 21 is provided on the bar 20 in order to position the blade 1 in the axial direction of the rotating shaft 2. In addition, here, four L-shaped bars 20
Although the frame-shaped rotating shaft 2 is constructed by combining two rods, two U-shaped rods 20 shown in FIG. 7 may be combined. Furthermore, although the blade 1 is shown here being attached to the side of the rotating shaft 2 that is supported by the rotating plate 3, it may be attached to a different side. That is, the oblique side 21 of the rotary shaft 2 may be supported by the support portion of the rotary plate 3. However, in this case, four rods 20 constituting the rotating shaft 2 are used, each of which has both ends bent at an angle of 45 degrees, so that each end of the rod 20 is located within the support portion 31.

[Effect of the idea]

As described above, in the present invention, the rotating shaft is supported by a support formed by bending that can maintain high positional accuracy. The center of rotation and the center of rotation of the rotary plate will not deviate from each other, and even if the rotation axis is a frame-shaped one, it can be made into a frame-shaped one without distortion by simply managing the bending angles of multiple rods. Therefore, the symmetry of the plurality of blades attached to the rotating shaft can be maintained well.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a sectional view of the same, Fig. 3 is a front view of the rotating plate and rotating shaft of the above, Fig. 4 is a partial sectional view of the same, and Fig. 5 6 is a sectional view of the above fitting, FIG. 7 is a front view of another example of the bar constituting the rotating shaft, and FIG. 8 is a perspective view of the conventional example. Figure 9 is a front view of the same as above, and Figure 10 is a perspective view of the rotating shaft of the same as above, where 1 is a blade, 2 is a rotating shaft, 3 is a rotating plate, 10 is a fixture, 20 is a bar, and 31 is a support. Show part.

Claims (1)

[Scope of utility model registration request] A rotary shaft bent into a frame shape, a rotary plate supporting the rotary shaft by a plurality of support parts bent around its periphery, and 4 rotatably attached to each side of the rotary shaft. The rotating shaft is formed by a combination of four L-shaped bent rods or two U-shaped bent rods. , a band door for a light projector, wherein the end of each bar is located within the support.