JPH04613Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention uses a light beam that scans an original image with a minute light spot.
Regarding an image scanning device that records a duplicate image by controlling a recording side scanning exposure means using an electric signal converted by a photoelectric conversion element, in particular, a scanning aperture that regulates the size and shape of a cross section of a scanning light beam is set at a predetermined position. This invention relates to a positioning device for mounting on.

[Prior Art] For example, in an image scanning recording device such as a color scanner for plate making, a light beam that scans an original image is split by a light beam branching means such as a half mirror, one of which is a light beam with a relatively small diameter corresponding to the scanning line pitch. A sharpened signal is output by photoelectrically converting the other one through an aperture with a larger diameter, and an unsharp signal with a blur is output by photoelectrically converting the other one through a larger aperture, and both signals are processed appropriately. The sharpness of the duplicated image is emphasized.

In this case, each aperture needs to be replaced with one with a different aperture size depending on factors such as the scanning line pitch and the degree of sharpness enhancement, and the center of each aperture must be aligned with the optical axis of each light beam. shall be installed in accordance with the

Traditionally, to replace these apertures, each aperture is mounted in its own holder, and then
There was a manual method of inserting the holder into a seat formed in the optical path and setting the desired aperture. However, this method requires the effort of opening and closing the device cover each time the aperture is replaced, and the fitting relationship between the holder and catch must be precisely machined to ensure positioning accuracy, so care must be taken when attaching and detaching. There are many difficulties in actual work, such as the requirement of

As a means to improve this, the present applicant proposed a rotary type aperture changing device as shown in FIGS. A patent application was filed for the device. FIG. 5 shows a side sectional view, and FIG. 6 shows a front view.

In this device, a rotating body 2 having a bottom plate at one end of a polygonal tube is rotatably attached to a rotating shaft 1 installed parallel to an incident light beam L, and a plurality of sets of through holes 3 are formed in the bottom plate and side walls of the rotating body 2. and 4, and the light beam is split by a half mirror 12 placed inside the rotating body 2.
The rotating body 2 is configured so that Ls and Lu pass through these through holes 3 or 4, and apertures for sharp signals and unsharp signals applied as a pair are attached to each set of through holes. By rotating to a required angular position, any set of apertures can be set on the optical axis.

In order to accurately align the selected aperture with the optical axis, a positioning ring 5 is integrally attached to the rotating body 2, and a contact device is attached to a notch 10 carved on the outer peripheral surface corresponding to the arrangement angle of each aperture. 11 is engaged to regulate the position of the aperture.

In the above-mentioned device, the apertures on the side of the light beam Ls passing through the half mirror 12 and traveling straight need only be arranged on a plane along the bottom plate. It can be manufactured relatively easily by arranging and processing different types of apertures 7a in a circular shape, and the mounting position can be easily adjusted.

On the other hand, the aperture on the side of the luminous flux Lu reflected by the half mirror 12 is constructed by fixing independent aperture holders 9a each equipped with an aperture plate 8 to each peripheral surface of the polygonal cylinder-shaped rotating body 2. In order to align the aperture with the light beam Lu, the mounting position of each aperture holder 9a must be adjusted.

Conventionally, this position adjustment has been carried out by means as shown in FIG. That is, each aperture holder 9a
A pair of L-shaped metal fittings 14 and 15 are arranged to surround the metal fitting 14, a spring 16 is attached to the metal fitting 15, and an adjustment bolt 17 is attached to the metal fitting 15.
By moving the aperture holder 9a in and out as appropriate,
After adjusting the position slightly and aligning it to the desired position,
A method of fixing was applied.

[Problems with Prior Art] The seventh illustrated means described above has the following problems.

First, position adjustment in this case means aligning the aperture 8a provided on the diaphragm plate 8 with the luminous flux Lu, so during the adjustment work, the half mirror 12 is actually used to adjust the position of the branched luminous flux Lu. Adjustments must be made while checking visually, but each aperture holder 9a has an L-shaped fitting 1 for adjustment.
4 and 15, there are problems such as an increase in the number of parts and the number of processing steps, an increase in shape and weight, and there is also a problem that the adjustment bolt 17 is difficult to operate because the installation space is narrow. In order to solve this problem, it may be possible to use the L-shaped fittings 14 and 15 as jigs only for adjustment and to remove them after the adjustment is completed. It takes time and effort to attach and detach the jig, so it cannot be said to be a fundamental solution.

[Means for Solving the Problems] The present invention uses a special jig for positioning the aperture holder to easily and reliably adjust the mounting position of the aperture holder.

In the device of the present invention, the rotating body with the positioning ring assembled thereon is mounted on a shaft set upright in a dedicated jig, and the positioning adjustment is made so that the rotating body is attached to the jig in a required positional relationship with respect to the rotating body. Adjust the position of the aperture holder depending on the frame and install it. In the positioning adjustment frame,
Similar to the conventional means shown in FIG. 7, a spring and an adjusting bolt are provided, and by moving the adjusting bolt in and out as required, the mounting position of the aperture holder can be finely adjusted.

If the positioning adjustment frame is fixed at the above required position, the rotating body cannot be rotated to the next position after the aperture holder is positioned and installed.
The positioning adjustment frame has a structure that allows it to be easily attached to and removed from the jig body, or a structure that allows it to be retracted outward from the above-mentioned required position with a single touch operation.

[Operation] Temporarily fix the aperture holder near the required position on the rotating body, attach it to the shaft installed upright on the main body of the special jig, and attach the positioning adjustment frame to the specified position on the main body.The positioning adjustment frame will adjust the aperture. Take a position surrounding the holder. Then, the position of the aperture holder is adjusted by moving the required adjustment bolt in and out, and once the positioning is completed, the aperture holder is fixed in that position.

[Embodiment] FIG. 1 is a perspective view showing a main part of an apparatus according to an embodiment of the present invention. In the same figure, the rotating body 2, positioning ring 5, and aperture plate 8 are the same as those shown in FIGS. Differently, it has a truncated pyramid shape with each side slanted.

The rotating body 2 with the positioning ring 5 assembled is the main body 1
It is rotatably supported by a ring 1 erected at 9. The main body 19 is provided with a striking device 22 similar to that shown in FIG. Regulates the rotation of. Although not shown, a mirror is installed at the same position as the half mirror 12 shown in FIG. 5, and a light beam for aperture positioning is projected through the through hole 4.

Positioning adjustment frame (hereinafter simply referred to as adjustment frame) 2
3 has a rectangular shape, and a bolt hole 2 is provided at one end of the rectangle.
The butterfly bolt 26 is inserted into the main body 19 by inserting the butterfly bolt 26 into the main body 4 and screwing into the screw hole 25 of the main body. In addition, a pair of positioning dowels 27 are provided upright on the main body 19, and by fitting these into the dowel holes 28 of the adjustment frame 23, the adjustment frame 23 can be moved relative to the rotating body 2.
You can always maintain a certain positional relationship when wearing it.

On each opposing side of the adjustment frame 23, a pair of position adjustment bolts 29 or pressure shafts 30 are provided facing inward, and these bolts and pressure shafts are attached to the inclined side surface of the aperture holder 9. They are installed with their axes tilted at the required angle so that they abut almost perpendicularly.

FIG. 2 shows the detailed structure and function of these bolts 29 and pressure shafts 30. A screw hole is machined on one of the opposite sides of the adjustment frame 23 to insert the bolts 29.
Screw in. Pressure shaft 30 attached to the other side of the opposite side
In this case, a cylindrical case 31 is fitted into the sapwood and fixed with a set screw 32, a plunger 33 is fitted to the tip of the case 31, and a plug 35 is screwed to the other end of the case. A spring 34 disposed between the two urges the plunger 33 inward.

That is, the aperture holder 9 to be positioned is installed in advance at a predetermined portion of the rotating body 2, and the bolt 18 is
When the adjustment frame 23 is mounted in a predetermined position with the dowels (27 and 28), the plunger 33 of the pressure shaft 30 presses one side of the aperture holder 9, and the aperture holder 9 Press it onto the tip of bolt 29. Therefore, bolt 2
By appropriately adjusting the amount of inward protrusion of the aperture holder 9, the aperture holder 9 is set and positioned at a desired position. At this time, since the cross-sectional shape of the aperture holder 9 is a trapezoid with a narrowed upper surface as shown in the figure, the pressing force of the bolt 29 and the plunger 33 generates a component force that presses the aperture holder 9 downward. to ensure tight contact with the outer surface of the rotating body 2.

The procedure for attaching each aperture holder 9 to a predetermined position on the rotating body 2 using the first illustrated apparatus is as follows.

First, a required number of diaphragm holders 9 each having a diaphragm plate 8 formed with a desired aperture are prepared, and the rotating body 2 is mounted on the shaft 1 of the main body 19.

The first aperture holder 9 is placed on the upwardly facing surface of the rotating body 2, and is temporarily secured with a bolt 18. In this case, the bolt 18 is loosely tightened so that the aperture holder 9 can move along the surface of the rotating body 2, and the positioning can be adjusted using the adjustment frame 23. Next, the adjustment frame 23 is attached to the position determined by the dowel 27, and the butterfly bolt 26 is
Fix it by.

In this state, a mirror (not shown) is used to visually check each adjustment bolt 29 from above so that the position of the aperture 8a transparently provided in the diaphragm plate 8 is aligned with the light beam projected through the through hole 4.
Adjust the amount of protrusion.

If the position of the aperture 8a is deviated toward the adjustment bolt 29 side, by screwing the bolt 29, the aperture holder 9 is pressed by the tip of the bolt 29 and can be easily moved.

On the other hand, if the position of the aperture 8a is deviated toward the pressure shaft 30 side, by retracting the bolt 29, the plunger 33 biased by the spring 34 of the pressure shaft 30 will press the aperture holder 9. and move this. However, the biasing force of the spring 34 installed in a minute space within the pressure shaft 30 is relatively weak, and the diaphragm holder 9 and rotating body
There is a possibility that it may not be possible to move smoothly in this direction due to the frictional force between the Therefore, when installing the adjustment frame 23, it is desirable to move each adjustment bolt 29 sufficiently backward in advance, and always perform positioning adjustment in the direction in which the bolt 29 is pressed.

Once the aperture 8a has been properly positioned to align with the light beam, tighten the bolt 18 to fully secure the aperture holder 9 and adjust the adjustment frame 23.
is removed from the main body 19, positioned so that the next surface of the rotating body 2 faces upward, and the second aperture holder is installed at the desired position using the same procedure as described above. Thereafter, this operation is repeated for the required number of aperture holders, and each aperture is mounted at a required position on the rotating body.

Since the device of the present invention is constructed as described above, there is no need to provide a position adjustment means for each individual aperture holder, and the device has a relatively large adjustment frame 2.
Since the positioning can be adjusted using the adjusting bolt 29 screwed into the positioning member 3, the operation is easy, and quick and accurate positioning is possible, and productivity can be greatly improved.

Note that in the first illustrated device, it is necessary to attach and detach the adjustment frame 23 to and from the main body 19 for each aperture holder 9, which requires some troublesome effort, but this burden can be alleviated by the following means.

FIG. 3 shows an improved fixing means for the adjustment frame 23, in which a screw hole 25 shown in FIG.
Instead, a vertical groove is machined, and a bolt 38 is pivotally connected to a shaft 36 installed in the appropriate position by a bearing 37, and a wing nut 39 and a washer 40 are fitted to this bolt 38. The bolt hole 24 of the adjustment frame 23 is also made into a slot facing rearward. The bolt 38 is attached to the wing nut 3 when the adjustment frame 23 is attached or detached.
9 is loosened and tilted as shown by the solid line, and when installed, the adjustment frame 23 is fixed in the position shown by the chain line.

According to the third illustrated means, it is possible to reduce the trouble of removing and inserting fixing bolts each time when attaching and detaching the adjustment frame 23, and it is possible to improve work efficiency.

FIG. 4 is a perspective view showing an embodiment for more quickly attaching and detaching the adjustment frame. With this method, the adjustment frame is moved along a guide rail provided on the main body without removing it from the main body one by one. The device is configured so that it can be evacuated from a predetermined position by doing so.

In FIG. 4, the adjustment frame 41 is located between the first and second positions.
The adjustment bolt and pressure shaft are the same as shown in the illustration.
Since this is exactly the same as described above, illustration and explanation will be omitted.

At the rear end of the adjustment frame 41, there is a sliding plate 42 perpendicular thereto.
are integrally attached, and a pair of left and right vertical sliders 43 are provided on the back surface thereof. A pair of left and right guide rails 45 that engage with the slider 43 are attached to the main body 44, and support the slide plate 42 and the adjustment frame 41 so as to be movable up and down.

Attach the stopper 46 to the appropriate position on the main body 44,
The stopper 46 engages with two upper and lower notches 47 recessed in the back surface of the sliding plate 42, thereby holding the adjustment frame 41 in two high and low positions. By pushing down or pulling up the handle 48 attached to the upper end of the sliding plate 42, the adjustment frame 41 can be adjusted.
is moved up and down between the above two positions.

It goes without saying that in the apparatus of this embodiment, the adjustment frame 41 is installed in the lower stage for positioning the aperture holder, and is moved to the upper stage when the rotating body is rotated or the aperture holder is inserted. This eliminates the need to remove the adjustment frame from the main body each time the aperture holder is positioned and installed, and work efficiency can be significantly improved.

In addition, during positioning, since the aperture holder is pressed downward as described above, the adjustment frame 41 receives the reaction force and is pushed upward. If this reaction force cannot be counteracted only by the engagement of the stopper 46 and the notch 47, an appropriate brake means, for example, a brake piece is interposed between the slider 43 and the guide rail 45, and the side surface of the main body 44 is It is desirable to provide means for crimping the sliding piece to the slider 43 using a push bolt screwed into the slider 43.

In the above embodiment, the adjustment frame 41 is slid upward and retracted from the outer peripheral surface of the rotating body, but this is not limited to linear movement, and may be rotated. That is, the purpose can be achieved even if the rear edge of the adjustment frame is pivoted to a suitable support shaft and rotated upward.

In each of the above-mentioned embodiments, two sets of position adjustment bolts 29 and pressure shafts 30 attached to the adjustment frame are arranged on each side, but only one set is arranged on one opposing side, and three sets are arranged on each side. Positioning may be performed using a point support method. In this case, two sets should be placed on the long side.

Furthermore, at least two bolts 29 are required on each side, but only one pressure shaft 30 may be provided on each side.

[Effects of the invention] (1) A large number of scanning apertures installed in an image scanning device such as a color scanner for plate making can be efficiently positioned and mounted at required positions on the outer periphery of a rotating body.

(2) It is no longer necessary to provide a positioning adjustment means for each individual aperture holder, which simplifies the product structure and streamlines the production process, reducing costs.
It can contribute to improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of an embodiment of the device of the present invention;
FIG. 2 is a sectional view showing how the diaphragm holder is positioned by the adjustment frame, FIG. 3 is a sectional view showing an example of means for fixing the adjustment frame, and FIG. 4 is a perspective view of essential parts of another embodiment of the device. FIG. 5 is a side sectional view of a rotary scanning aperture exchange device to which the present invention is applied;
This figure is also a front view, and FIG. 7 is a diagram showing an example of conventional means for positioning the scanning aperture. 1...Rotating shaft, 2...Rotating body, 3, 4...Through hole, 5...Positioning ring, 6...Through hole, 7...Aperture plate for straight beam, 8...Aperture plate for reflected light beam, 7a,
8a...Scanning aperture, 9...Aperture holder,
10... Notch, 11... Hitting device, 12... Half mirror, 14, 15... Positioning metal fittings, 1
6...Spring, 17...Adjustment bolt, 19
...Main body, 23...Adjustment frame, 26...Butterfly bolt,
27... Positioning dowel, 29... Adjustment bolt, 30... Pressure shaft, 33... Plunger, 41...
...adjustment frame, 42...sliding plate, 46...hitting device,
47... Notsuchi.

Claims (1)

[Claims for Utility Model Registration] (1) On the outer periphery of a cylindrical or polygonal cylindrical rotating body,
In an apparatus in which a plurality of aperture plates each having a required scanning aperture are positioned and mounted in the same positional relationship relative to the center of rotation of the rotating body, each of the aperture plates has the same shape. Attach it to the aperture holder, and on the other hand,
comprising a support device that rotatably supports the rotating body around its center of rotation, and an aperture holder positioning means that is attached to the support device in a fixed position so as to be detachable or movable and retractable from the fixed position,
A scanning aperture mounting and positioning device for an image scanning device, wherein the aperture holder is positioned and mounted at a desired position on the rotating body by the positioning means arranged at the fixed position. (2) The aperture holder positioning means includes a frame surrounding the aperture holder at a required interval, and a plurality of abutment means attached to each side of the frame so that the amount of inward protrusion can be adjusted. A scanning aperture mounting and positioning device for an image scanning device as set forth in claim (1) of the patented utility model. (3) The aperture holder has a pyramidal shape with a trapezoidal cross section.
The scanning aperture mounting and positioning device for an image scanning device according to claim (2), wherein the abutting means abuts against the sloped surface of the pyramid for positioning. (4) The image scanning device according to claim (1) of the utility model registration, characterized in that the positioning means is slidably retracted from a predetermined position of the rotating body support device along a guide rail. Scanning aperture mounting positioning device. (5) Utility model registration claim No. 1, characterized in that the positioning means is pivotally connected to the rotating body support device on one side and is rotatably retracted from a predetermined position.
A scanning aperture mounting positioning device for an image scanning device according to paragraph (1).