JP4139500B2 - Cutter device for spotlight - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutter device for a spotlight, and more particularly to a spotlight cutter device for manually cutting a plurality of cutter blades to cut light into an arbitrary frame shape.
[0002]
[Prior art]
Conventionally, this type of cutter device is provided with a plurality of cutter blades, usually four upper and lower, left and right cutter blades that surround an aperture portion, with cutter blades having an operation shaft fixed to a blade plate made of a thin metal plate. In a support frame consisting of two front and rear press plates, they are held in a superposed state in a pressed state and are slidable, and each cutter blade is individually moved in the sliding direction by operating the operation shaft, and the light passing through the aperture is It is designed to be cut into arbitrary frame shapes such as trapezoid, triangle, diamond, and slit.
[0003]
According to the above-described conventional technology, each cutter blade is slidable, and each cutter blade is placed in pressure contact between the two front and rear press plates and pressed by the coil spring pressure so that the positioned cutter blade does not easily move. Since it is held, the slide operation of each cutter blade by the operation shaft becomes heavy, and it cannot be said that the operability is always good, and there is a problem that fine adjustment is difficult.
[0004]
The present invention has been made in view of the above-described conventional circumstances. The purpose of the present invention is that each cutter blade can be easily slid and fixed in such a way that it does not shift due to slight vibrations in a positioned state. It is an object of the present invention to provide a spotlight cutter device capable of performing the above.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the gist of the cutter device of the present invention is that a lock mechanism for regulating the slide of the cutter blade is provided for each cutter blade.
[0006]
According to such a configuration, when the cutter blades are stacked in pressure contact and are held by pressure by a biasing member such as a coil spring, each cutter blade is provided with a lock mechanism that restricts its slide. The pressure contact state can be made to have a low resistance that can be easily slid by the operation shaft.
[0007]
Further, the present invention is configured such that an operation shaft for sliding operation is rotatably attached to a blade plate to form the cutter blade, and the operation shaft has a cross-sectional shape having two types of diameters, a long diameter side and a short diameter side, When the presser members are arranged above and below the operation shaft, and when the long shaft side of the operation shaft is held by both presser members, sliding of the operation shaft is restricted, while when the short shaft side of the operation shaft is held by both presser members The gist is that the lock mechanism is formed by urging the upper and lower pressing members so that the operation shaft is slidable.
[0008]
In this configuration, when the upper and lower presser members hold the short axis side of the operation shaft (free state), the holding of the operation shaft by both presser members is in a light load state, and the cutter blades The pressure contact state is of a low resistance that can be easily slid by the operation shaft. On the other hand, when the upper and lower presser members hold the longer diameter side of the operation shaft (locked state), the holding of the operation shaft by both presser members is in a heavy load state, the slide of the operation shaft is restricted, and the cutter blade is light. It is maintained in a state where it has been fixed to such an extent that it does not shift due to vibrations. The switching between the free state and the locked state can be performed by rotating the operation shaft.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to FIGS.
The cutter device of this example holds four cutter blades 2 arranged vertically and horizontally so as to surround the aperture portion 1 so as to be slidable within a cylindrical support frame 3, and arbitrarily passes light passing through the aperture portion 1. It is formed so that it can be cut into a frame shape.
[0010]
Each cutter blade 2 fixes a bearing member 22 to the central portion of a blade plate 21 formed in a substantially fan shape by a thin metal plate, and supports an operation shaft 23 for sliding operation by the bearing member 22 so as to be rotatable. Become.
[0011]
Each vane plate 21 is arranged in a superposed manner with a pressing force that can be easily slid by the operation shaft 23 by the coil spring 4 loaded between the upper plate 31 and the lower plate 32 of the support frame 3. Yes.
[0012]
The operation shaft 23 is formed in a rectangular shape with a rounded cross section, and has a long diameter 23a on the long side and a short diameter 23b on the short side in the orthogonal direction, and a small diameter inner end 24 having a circular cross section. Is inserted into the bearing member 22 and is supported rotatably. An operation knob 25 is attached to the outer end of the operation shaft 23. Needless to say, the operation shaft 23 excludes at least portions held by upper and lower pressing members 51 and 52 described later having a square cross section.
[0013]
The support frame 3 has a window hole 33 communicating with the aperture portion 1 in the center of the upper plate 31 and the lower plate 32 made of a circular plate, and is locked between the outer peripheral edges of the upper plate 31 and the lower plate 32. The operation shaft 23 is slidably arranged via the mechanism 5.
[0014]
The lock mechanism 5 includes upper and lower pressing members 51 and 52 that hold the operation shaft 23, and an urging member 53 that urges the pressing member 52 toward the pressing member 51.
[0015]
The holding members 51 and 52 are formed of arc-shaped strips that cover the rotation range (about 90 degrees in this example) of each cutter blade 2 at the outer peripheral edge of the support frame 3. One presser member 51 is fixed along the outer peripheral edge of the upper plate 31, and the other presser member 52 is urged toward the presser member 51 by the urging member 53 disposed on the lower plate 32 side. The operation shaft 23 is slidably held between 51 and 52.
[0016]
The urging member 53 is configured to hold the plunger 55 against the pressing member 52 by a spring 54 fixed to the lower plate 32, and the urging force of the spring 54 is applied to the operation shaft 23 by the both pressing members 51, 52. When holding the longer diameter 23a side, the slide of the operation shaft 23 is restricted. On the other hand, when the both pressing members 51 and 52 hold the shorter diameter 23b side of the operation shaft 23, the operation shaft 23 is made slidable.
[0017]
The urging members 53 are arranged at appropriate intervals along the length direction of the pressing member 52. Both end portions of the pressing member 52 are fixed to the lower plate 32 side by retaining members 56 such as screws, and the urging range by the urging member 53 is appropriately regulated.
[0018]
In the cutter device of this example configured as described above, in the free state in which the upper and lower pressing members 51 and 52 hold the minor axis 23b side of the operation shaft 23 (see FIG. 4B), the both pressing members 51 and 52 are provided. The operation shaft 23 is held in a light load state, and the pressure contact state between the blade plates 21 in each cutter blade 2 is such that the slide operation by the operation shaft 23 can be easily performed (only the pressing force by the coil spring 4). Low resistance.
Therefore, in this state, the operability of each cutter blade 2 is excellent and fine adjustment can be easily performed.
[0019]
When the operating shaft 23 is rotated from this state to bring the upper and lower pressing members 51 and 52 into a locked state (see FIG. 4A) where the long shaft 23a side of the operating shaft 23 is held, the both pressing members 51 and 52 are pressed. The operation shaft 23 is held in a heavy load state, the slide of the operation shaft 23 is restricted, and each cutter blade 2 is maintained in a fixed state so as not to be displaced due to slight vibration or the like.
In this example, as described in [0012], the cross-sectional shape of the operation shaft 23 is a substantially rectangular cross-section and a square portion with a rounded curved shape. However, the shape is not necessarily limited to this shape. Any cross-sectional shape having a major axis 23a and a minor axis 23b in the orthogonal direction may be used. However, considering the operability when switching between the free state and the locked state, and the prevention of rattling in the free state and the locked state to ensure that the state is maintained, the cross section is substantially rectangular and the square portion is A curved shape with a corner is preferable.
[0020]
【The invention's effect】
As described above, since the cutter device of the present invention is provided with the lock mechanism for regulating the slide of the cutter blade for each cutter blade, the pressure contact state between the cutter blades can be easily slid by the operation shaft. Of low resistance.
Therefore, the cutter blades are excellent in operability, can be finely adjusted easily, and can be fixed to the extent that they are not displaced by slight vibration or the like in the positioned state.
In addition, since the urging force by the urging member such as a coil spring for holding each cutter blade in a pressure contact state can be made lighter than before, damage due to sliding contact between the cutter blades is reduced, The life of the urging member is longer than before, and it can be expected to improve the reliability, reduce the manufacturing cost and the maintenance management cost.
[0021]
In addition, a rotatable operation shaft having two types of diameters, the long diameter side and the short diameter side, is held by the upper and lower press members, and when the long diameter side of the operation shaft is held by both press members, the operation shaft slides. On the other hand, when the lock shaft is formed by urging the upper and lower presser members so that the operation shaft is slidable when the short shaft side of the operation shaft is held by both presser members, the operation shaft is rotated. In addition, since the switching between the locked state and the free state can be performed by an extremely simple operation of simply switching between the long diameter side and the short diameter side, there are many effects such as further improved operability.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of an embodiment of a cutter device according to the present invention.
FIG. 2 is a plan view of the same.
3 is an enlarged sectional view taken along line (X)-(X) in FIG.
4 is an enlarged cross-sectional view taken along line (Y)-(Y) in FIG. 3, wherein (a) shows a locked state and (b) shows an unlocked state.
FIG. 5 is an enlarged perspective view of a cutter blade.
[Explanation of symbols]
1: Aperture part 2: Cutter blade 21: Blade plate 23: Operation shaft 23a: Long diameter 23b: Short diameter 3: Support frame 4: Coil spring 5: Lock mechanism 51, 52: Pressing member 53: Biasing member 54: Spring 55 : Plunger

Claims (1)

A plurality of cutter blades arranged so as to surround the aperture portion and slidably held within the supporting frame, the cutter device of the spotlight which is formed to be cut at any frame shape light passing through the aperture portion, the blade plate Each of the operation shafts for slide operation is rotatably attached to form the cutter blade, and the operation shaft has a cross-sectional shape having two types of diameters, a major axis side and a minor axis side, and is formed above and below the operation shaft. The presser member is arranged and the slide of the operation shaft is restricted when the long shaft side of the operation shaft is held by both presser members, while the operation shaft is slidable when the short shaft side of the operation shaft is held by both presser members. A spotlight cutter device in which a lock mechanism for energizing the upper and lower presser members to restrict the slide of the cutter blade is formed .

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