Four-side retractable magnifying ruler plate for darkroom

Abstract

The utility model discloses a darkroom four-side contraction magnification ruler plate, which comprises a bottom plate, a ruler plate frame is hinged on the bottom plate through a damping hinge, the middle part of the ruler plate frame is hollow and is integrally formed, an adjusting frame is connected in the ruler plate frame, a plurality of paper pressing plates are slidably connected to the top of the adjusting frame in the transverse direction and the vertical direction, and magnets are arranged at the two ends of each paper pressing plate. Through the arrangement of the square structure of the ruler plate frame and the adjusting frame, the ruler plate frame and the adjusting frame can be universally used in the transverse direction and the vertical direction, the size can be rapidly adjusted without changing the direction of the bottom plate or the ruler plate, and the size plates connected to the four faces of the adjusting frame and the corresponding size marks on the size plates can be rapidly adjusted. A darkroom worker can clearly preview the size of an image and accurately position the image, the tedious workload is greatly reduced, conception and operation are convenient and rapid, the magnets at the two ends of the paper pressing plate and the adjusting frame are magnetically attracted to press photographic paper, the magnetic attraction pressing mode is easy and convenient to operate, and time and energy are saved.

Description

Technical Field

[0001] This utility model belongs to the field of ruler technology, specifically relating to a four-sided enlarged ruler for darkrooms. Background Technology

[0002] In the field of photography, to avoid accidental exposure and damage to the photographic paper, the photos are usually developed in a dark room in a dark environment, using a magnifying plate to assist in placing the photographic paper and adjusting the image size.

[0003] Currently, adjusting the size of photographic paper on a ruler often requires changing the orientation of the negative or the ruler, which is cumbersome. This not only increases the workload of the darkroom technician but also makes it easy to make mistakes, making it difficult for the technician to quickly preview the image size and position it, resulting in low work efficiency. Furthermore, when adjusting the size of the photographic paper, darkroom technicians often use clips to fix the paper. If the force applied when fixing the clips is uneven, the paper is prone to wrinkles, resulting in flaws in the printed photos. Moreover, the darkroom technician has to open each clip one by one, accurately place the photographic paper in the appropriate position, and then tighten each clip one by one. The whole process consumes a lot of time and energy, which greatly reduces the efficiency of photo printing. Utility Model Content

[0004] The purpose of this utility model is to provide a four-sided enlarged scale board for darkrooms to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a four-sided enlarged ruler board for darkrooms, comprising:

[0006] The base plate has a ruler frame hinged to it via a damping hinge. The ruler frame has a hollowed-out center and is integrally formed. An adjustment frame is connected inside the ruler frame. Several pressure plates for pressing photographic paper are slidably connected to the top of the adjustment frame in both the horizontal and vertical directions. Magnets are provided at both ends of the pressure plates, and the magnets are magnetically attracted to the adjustment frame.

[0007] Preferably, the pressure plate is arranged in a grid pattern.

[0008] Preferably, the base plate, ruler frame, and adjustment frame are all square, and the adjustment frame is connected to a size plate on each of its four sides.

[0009] Preferably, the front end of the ruler frame is connected to a handle.

[0010] Preferably, the base plate, ruler frame, adjustment frame, and pressure plate are all made of metal.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) By using the square structure of the ruler frame and the adjustment frame, it can be used in both horizontal and vertical directions. Without changing the direction of the film or ruler, the size can be quickly adjusted. The size plates connected to the four sides of the adjustment frame and the corresponding size markings on the size plates allow the darkroom technician to preview the image size at a glance and accurately position it, which greatly reduces the tedious workload and facilitates quick design and operation.

[0013] (2) The photo paper is pressed by magnetic attraction between the magnets at both ends of the pressure plate and the adjustment frame. This magnetic pressing method is simple to operate, saves time and effort, and ensures that the photo paper is firmly fixed, avoiding displacement of the photo paper during the printing process, and effectively improving the quality of the printed photos. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a side view of the present invention;

[0016] Figure 3 This is a schematic diagram of the ruler frame of this utility model.

[0017] In the diagram: 1. Base plate; 2. Damping hinge; 3. Ruler frame; 4. Adjustment frame; 5. Pressing plate; 6. Magnet; 7. Dimension plate; 8. Handle. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] This utility model provides, for example Figure 1-3 The image shows a type of enlarged-size panel for a darkroom, comprising:

[0020] A base plate 1 is provided, on which a ruler frame 3 is hinged via a damping hinge 2. The ruler frame 3 is hollowed out in the middle and integrally formed. An adjustment frame 4 is connected inside the ruler frame 3. Several pressing plates 5 for pressing photographic paper are slidably connected to the top of the adjustment frame 4 in both the horizontal and vertical directions. Magnets 6 are provided at both ends of the pressing plates 5, and the magnets 6 are magnetically attracted to the adjustment frame 4.

[0021] The pressure plate 5 is arranged in a grid pattern.

[0022] The base plate 1, the ruler frame 3, and the adjustment frame 4 are all square, and the adjustment frame 4 has a size plate 7 connected to each of its four sides.

[0023] The front end of the ruler frame 3 is connected to a handle 8, which facilitates the opening and closing of the ruler frame 3 by pulling it.

[0024] The base plate 1, ruler frame 3, adjustment frame 4, and pressing plate 5 are all made of metal. Metal has high strength and hardness, and can withstand greater external impact and friction. In the daily use of the darkroom, whether it is the frequent opening and closing of the ruler frame 3 or the repeated operation of adjusting the pressing plate 5, the metal is not easy to be damaged or deformed, which greatly extends the service life of the enlarged ruler and reduces the cost and frequency of equipment replacement.

[0025] This darkroom uses a four-sided enlarged ruler plate. The ruler plate frame 3 is hinged to the base plate 1 via a damping hinge 2. This design allows the ruler plate frame 3 to open and close flexibly. By pulling the handle 8, the ruler plate frame 3 can be opened to place the photographic paper on top of the base plate 1. When the ruler plate frame 3 is closed, the photographic paper can be clamped between the base plate 1 and the ruler plate frame 3. When it is necessary to adjust the size of the photographic paper, the darkroom technician can adjust the size according to the actual needs by sliding the pressure plate 5 inside the adjustment frame 4 in the horizontal and vertical directions of the adjustment frame 4 through the hole markings on the size plate 7. Since there are size plates 7 on all four sides of the adjustment frame 4, the size of the photographic paper can be quickly and accurately adjusted without changing the film or the ruler plate direction, so as to meet the size requirements of different photo printing.

[0026] After adjusting the size, the magnets 6 at both ends of the pressing plate 5 and the adjusting frame 4 are magnetically attracted. When the pressing plate 5 slides to the appropriate position, the magnets 6 and the adjusting frame 4 are tightly attracted, firmly pressing the pressing plate 5 onto the top of the photographic paper. This ensures that the photographic paper will not shift or wrinkle during the printing process, thus ensuring the quality of the printed photos.

[0027] The ruler frame 3, base plate 1, adjustment frame 4, and pressure plate 5 are all made of metal, and the ruler frame 3 is integrally molded. This robust structural design ensures the overall stability of the enlarged ruler. The ruler's stability allows it to remain balanced when placed on the workbench, preventing it from easily shaking or shifting. The square corners of the ruler frame 3 and adjustment frame 4 further enhance the stability of the ruler during use, providing a reliable operating platform for adjusting the size of photographic paper and printing. The overall design of the base plate 1, ruler frame 3, and adjustment frame 4 ensures that the four corners are square and the dimensions are accurate. The outer dimensions are 370x370mm (14.5x14.5 inches), and the inner dimensions are 305x305mm (12x12 inches). During the printing process, it can provide a stable and accurate size reference for the photographic paper, ensuring that the printed photos meet the expected size standards.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A four-side retractable ruler for darkroom use, characterized by comprising: Include: The bottom plate (1), the ruler plate frame (3) is hinged on the bottom plate (1) through damping hinge (2), the middle part of the ruler plate frame (3) is hollow and integrally formed, the adjusting frame (4) is connected in the ruler plate frame (3), the top of the adjusting frame (4) is slidably connected with several paper pressing plates (5) for pressing photo paper in horizontal and vertical directions, both ends of the paper pressing plate (5) are provided with a magnet (6), and the magnet (6) is magnetically attracted to the adjusting frame (4).

2. The four-side retractable ruler for darkroom according to claim 1, characterized in that: The paper pressing plate (5) is arranged in a cross shape.

3. The four-side retractable ruler according to claim 1, characterized in that: The bottom plate (1), the ruler plate frame (3) and the adjusting frame (4) are all arranged in a square shape, and the four sides of the adjusting frame (4) are all connected with size plates (7).

4. The four-side retractable ruler according to claim 1, characterized in that: The front end of the ruler plate frame (3) is connected with a handle (8).

5. The four-side retractable ruler according to claim 1, characterized in that: The bottom plate (1), the ruler plate frame (3), the adjusting frame (4) and the paper pressing plate (5) are all made of metal.

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