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45 results about "Contact print" patented technology

A contact print is a photographic image produced from film; sometimes from a film negative, and sometimes from a film positive or paper negative. In a darkroom an exposed and developed piece of photographic film or paper is placed emulsion side down, in contact with a piece of photographic paper, light is briefly shone through the negative or paper and then the paper is developed to reveal the final print.

Printing and dyeing equipment high in printing and dyeing quality

The invention discloses printing and dyeing equipment high in printing and dyeing quality. The equipment comprises a dye box and a transverse plate, the dye box is located below the transverse plate,the two sides of the dye box are both fixedly connected with an electric retractable rod, the top of each electric retractable rod is fixedly connected with a connecting plate, the bottom of each connecting plate is fixedly connected with a vertical plate, and the bottom of each vertical plate extends to an inner cavity of the dye box; a motor box is fixedly connected with the positions, in the inner cavity of the dye box, on the surfaces of the vertical plates; a motor is fixedly connected with the positions, in an inner cavity of the motor box, on the surfaces of the vertical plates. Materials are extruded through an extrusion roller, so that the materials are in close contact with a printing and dyeing roller, the printing and dyeing quality of the materials is improved, and the problems are solved that when printing and dyeing equipment performs contact printing on the materials through the printing and dyeing roller, the height of the printing and dyeing roller cannot be adjusted,accordingly the printing and dyeing roller cannot be in close contact with the materials, and the printing and dyeing quality of the materials is reduced.
Owner:叶侃

Online testing device and testing method for full-field deformation in contact print of rubber tire tread rubber material

The invention relates to an online testing device and testing method for full-field deformation in the contact print of a rubber tire tread rubber material. The online testing device comprises a support platform, a linear loading adjustment mechanism, a rotation loading adjustment mechanism, an adaptive clamping mechanism and a vision detection system, wherein the linear loading adjustment mechanism and the vision detection system are fixedly connected on the support platform according to a certain location relationship; the linear loading adjustment mechanism and the rotary loading adjustmentmechanism are fixedly connected; the adaptive clamping mechanism is fixedly connected with a pressure sensor; and the pressure sensor is fixedly connected with a torque sensor. The device can completely simulate stress deformation of a tire tread rubber material of a tire in the contact print under various work conditions, can solve the problems that a single-point contact measurement mode of anexisting tire tread rubber material in the contact print is difficult to implement, has a large testing result error and cannot acquire full-field deformation characteristics of the tire tread rubbermaterial in the contact print by a non-contact vision measurement method, has the characteristic of concise structure, and is easy to control and adjust.
Owner:JILIN UNIV

An Improved Contact Analysis Method for Tooth Loading

ActiveCN104408220BCalculations are precise and easySpecial data processing applicationsStress distributionElement model
The present invention discloses a modified method for gear teeth loading contact analysis. The method obtains a tooth surface equation and a normal vector equation of the gear through geometric calculation based on deformation compatibility conditions; and performing gear teeth contact analysis with no load on such basis to obtain contact prints and transmission error by the gear engagement, principal curvature and principal direction of the tooth surfaces, and derivative method curvature of the tangent tooth surfaces, thereby establishing a relation within the size of the contact oval, the amount of compression of the tooth surface, and the load; determining load distribution of the gear by combining with Hertz theoretical formula and a flexibility coefficient method, considering effect from an installing error and a supporting error, and nonlinearity of the contact flexibility coefficient; and according to a load distribution result among the teeth, using the Hertz formula to calculate a tooth surface pressure distribution and a contact stress distribution at a certain moment of the large and small gears, and using a three-dimensional finite element model to perform stress calculation to obtain a reliable bending stress. The gear teeth loading contact analysis method plays an important role in design, calculation and application of the technical field of gears.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
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