JPS6145553Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a light shielding cover for a tape reader. The exposure drafting apparatus shown in Fig. 1, which uses an optical mechanism to create drafts of printed wiring patterns, photochemical etching patterns, etc., operates the console-type control device shown in Fig. 2, and It is designed to operate automatically by issuing a drafting command. One of the operating methods is to load a paper tape on which parallel codes are punched according to a program determined for a printed wiring pattern onto the tape handler 1 via a reel, and then to the tape feed mechanism 1'.
If the tape is fed out by the paper tape reader 2 and taken up on the take-up reel attached to the tape handler 1, the paper tape leader 2
The code read by the scanner is converted into an electrical signal and input to the drawing device, and the drawing table 3 is driven in the XY axes as instructed, and line exposure and flash exposure are performed from the exposure head 3' to produce the drawing. A drawing is automatically recorded on the raw film surface fixed to the table 3. By the way, it goes without saying that the above-mentioned drafting work is done in a darkroom,
The paper tape reader 2 uses a so-called photoelectric reading mechanism that uses a photoconductive cell to catch the light transmitted through the holes in the paper tape from a light source such as a tungsten lamp. It is necessary to prevent the light from being exposed to light, and for this purpose, the door 4 is equipped with a transparent red acrylic resin window that is both light-shielding and dust-proof.
is located at the top of the console. A reel wound with perforated paper tape is attached to the tape handler 1, and then the paper tape is fed out through the tape feeding mechanism 1', passed through the tape leader 2, and then hooked onto the take-up reel via the feeding mechanism 1'. When loading paper tape, it is sufficient to open the door 4 all the way, and there is no problem. In the simple method that is often used, the paper tape shown by the two-dot chain line is passed through an opening 5 made on the left side of the door 4, set on the tape reader 2, and then opened in the same way on the right side of the door 4. Take it out from the
Since the tape is fed and read only by the tape reader 2 without using the tape handler 1 or the tape feeder 1', the light shielding and dustproofing by the door 4 described above does not really affect the loading of the paper tape in this case. I have to say that it has a comfortable structure.

This invention solves the operational inconvenience of the conventional door 4, that is, the light-shielding cover of the paper tape reader 2, by providing a dedicated local light-shielding cover for the paper tape reader, and using this light-shielding cover. , consisting of a fixed light-shielding cover body that covers the top, bottom, back, and part of the side surfaces of the head of the paper tape reader, and a movable cover that can be opened and closed to cover the front and at least the remaining side surfaces of the head. A heat radiation opening is formed in the top plate forming the upper surface of the fixed light-shielding cover body, and a light-shielding auxiliary plate is provided between the top plate and the head part, and the movable cover is fully opened when paper tape is attached. This invention relates to a light-shielding cover for a tape reader, which is characterized in that it provides good operability.

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings. FIG. 3 is a perspective view showing the external appearance of this embodiment, and FIG. 4 is a side sectional view thereof. In the figure, reference numeral 11 denotes a light-shielding cover body, which is fixed to the panel portion 2' of the paper tape reader 2 shown by the two-dot chain line in FIG. is a movable light-shielding cover, with a red transparent plate 13' on the front.
(for example, an acrylic resin plate) is fitted. Reference numeral 14 denotes a rotation shaft of the movable cover 13, the inner end of which is fixed to the cover body 11, and the outer end rotatably engaged with the movable cover 13. Reference numeral 15 denotes a tension coil spring, and spring hangers 1 are attached to the cover body 11 and the movable cover 13, respectively.
5', and when the cover is closed, a counterclockwise moment as shown by the arrow is applied to the rotating shaft 14, and when the cover is fully open, a clockwise moment is applied to the elastic force. Therefore, they are given to each of them. Reference numeral 16 denotes an auxiliary light-shielding plate, which is attached inside the cover main body 11 in parallel with the top plate, and 17, a light-shielding baffle plate, which is attached to the back surface of the movable cover 13. 18 is a louver attached to the opening of the top plate of the cover body 11. When a tungsten lamp, for example, is used as the light source lamp 19 built into the head portion of the paper tape reader 2, the amount of heat generated is large, so this serves to radiate heat to the outside air while blocking light. The inner surfaces of the light-shielding cover body 11 and the movable cover 13, the auxiliary light-shielding plate 16, and the light-shielding baffle plate 17, respectively.
Both sides are painted matte black. Notches 20 provided at the lower corners of the side plates of the cover body 11 and the movable cover 13 each serve as openings for inserting and removing paper tape.

Next, the operation of this embodiment will be explained.

When attaching the perforated paper tape to the paper tape leader 2, the movable cover 13 is rotated around the pivot shaft 14 by hand on the lower front end of the movable cover 13. When the movable cover 13 is rotated in the direction shown by the arrow while resisting, the front upper corner of the cover 13 comes into contact with the top plate of the cover body 11, and the movable cover 13 is in the fully open position shown by the two-dot chain line. It is held by the clockwise moment from the coil spring 15 applied to the shaft 14. Since the movable cover 13 can be held in the fully open position in this way, the paper tape can be attached to the paper tape leader 2 very easily. After attaching the tape, the movable cover 13 can be gradually returned to the illustrated closed position by holding its lower front end. When the movable cover 13 is closed in this way, the lamp 19 is turned on and the drafting work is started. In this case, light leaks to the outside from the gap between the heat dissipation louvers 18, for example through the path shown in the figure, but on its way, the light passes through the inner wall surface of the cover body 11, which is painted matte black, and the light shielding auxiliary plate. It is reflected many times by the surface of 16 and goes out to the outside as shown by the arrow, and as a result of being absorbed by the reflecting surface each time during the multiple reflections described above, the leakage of light to the outside is weakened. External light leakage cannot expose the raw film on the three sides of the drafting table. Further, the light shielding baffle plate 17 effectively prevents light from leaking from the gap existing at the contact point between the movable cover 13 and the paper tape reader 2 when the movable cover 13 and the paper tape reader 2 are in contact with each other when the movable cover 13 is closed. Furthermore, leakage of light from the sides is sufficiently prevented because the side plates of the light-shielding cover body 11 and the light-shielding movable cover 13 are overlapped by l as shown in the figure. It goes without saying that this light-shielding cover for the paper tape reader 2, consisting of the light-shielding cover main body 11 and the movable cover 13, also has a dustproof effect. The paper tapes dropped downward from both left and right ends of the paper tape leader 2 can freely move in and out of the notch 20 at the bottom corner of the side plate of the cover 13 even when the movable cover 13 is closed. has been done.

The front window 13' of the movable cover 13 is made of a transparent red plate, such as an acrylic resin plate, which has an excellent light-shielding effect, as in the past, so that the internal operating state can be observed without fear of light leakage.

As is clear from the above explanation, the light-shielding cover according to this invention is often used when the length of the perforated paper tape is too long to wrap it around a reel and attach it to a tape handler. This operation of directly attaching the paper tape to the paper tape reader can be fully opened by opening the light-shielding movable cover on the front upwards, and because of its excellent operability, it has been replaced with a conventional single-swing type light-shielding door. This is extremely easy compared to other models, and the side plates of the light-shielding cover body and the movable cover overlap each other to a considerable extent.
It can completely prevent light leakage from the sides, and since the auxiliary light shielding plate is installed inside the light shielding cover body, the light leakage from the light source lamp's heat dissipating louver is prevented many times before reaching the louver. Since reflection is unavoidable, each reflection is weakened by absorption by the wall surface, and this external light leakage is prevented from exposing the raw film on the drafting table surface. When installing a light-shielding baffle plate on the back side of the unit, it can prevent light from leaking through the gap that exists at the contact point between the light-shielding movable cover and the paper tape reader, and it maintains the same light-shielding function as conventional ones. .

Although the above embodiment has been explained using an exposure drawing apparatus, it is not limited thereto, and it goes without saying that the present invention can be used in any tape reader that requires light shielding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main body of the exposure drafting apparatus, FIG. 2 is a perspective view of the conventional console-type control device,
FIG. 3 is a perspective view showing the appearance of an embodiment of this invention, and FIG. 4 is a side sectional view thereof. 1...Tape handler, 1'...Tape feeding mechanism, 2...Panel paper tape leader, 2'...
... Panel part, 3 ... Drafting table, 4 ... Light-shielding door, 11 ... Light-shielding cover main body, 13 ... Light-shielding movable cover, 14 ... Rotating shaft, 16 ... Auxiliary light-shielding plate,
17... Light blocking baffle plate, 19... Light source lamp, 20
...Notch opening.

Claims (1)

[Claims for Utility Model Registration] 1. A tape leader is provided with a dedicated local light-shielding cover, and this light-shielding cover is combined with a fixed light-shielding cover body that covers the upper, lower, back, and side surfaces of the head of the tape leader. , a movable cover that can be opened and closed to cover the front surface of the head part and at least the side surface of the remaining part; 1. A light-shielding cover for a tape reader, characterized in that a light-shielding auxiliary plate is provided between the head portion and the head portion. 2. A light-shielding cover for a tape reader according to claim 1 of the registered utility model claim, which comprises a light-shielding baffle plate attached to the back side of the lower front end of the movable cover.