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One or more sheets of paper are inserted between the head and the die, with the flat face of the head parallel to the surface of the sheets. Moving the handle pushes the head straight through the sheets of paper. The hard edge of the punch vs the die cuts a hole in the paper, pushing the cut piece out the bottom of the die.
The counterpunch would be struck into the face of the punch. The outer form of the letter is then shaped using files. To test the punch, the punchcutter makes an imprint on a piece of paper after coating the punch with soot from an open flame. The soot left by the flame acts like ink to create an image on the paper (a smoke proof).
The standard method to make a matrix was to drive a steel punch in the shape of the type to be made into soft copper. [10] The matrix could then be cleaned up and cut down to the width of the letter to be cast: this is called "justification" and sets the width of the letter when cast. A matrix that has not yet been justified is called a "strike".
The punch force required to punch a piece of sheet metal can be estimated from the following equation: [4] F = 0.7 t L ( U T S ) {\displaystyle F=0.7tL(UTS)} Where t is the sheet metal thickness, L is the total length sheared (perimeter of the shape), and UTS is the ultimate tensile strength of the material.
The artist-designer Jules Chéret (1835–1932) was a notable early creator of French Art Nouveau posters. He helped turn the advertising poster into an art form. The son a family of artisans, he apprenticed with a lithographer and also studied at the École nationale supérieure des arts décoratifs.
The small pieces punched out by a keypunch fell into a chad box, [2] [3] or (at IBM) chip box, or bit bucket. In many data processing applications, the punched cards were verified by keying exactly the same data a second time, checking to see if the second keying and the punched data were the same (known as two pass verification ).
To make a print, the engraved plate is inked all over, then the ink is wiped off the surface, leaving ink only in the engraved lines. The plate is then put through a high-pressure printing press together with a sheet of paper (often moistened to soften it). The paper picks up the ink from the engraved lines, making a print.
A Dymo brand tape embosser. The machine features multiple embossing dies arranged on two parallel wheels. Each character has one positive die and one negative die. Typically all of the negative dies are constructed on one rigid wheel, while all the positive dies are constructed on a divided flexible wheel, similar to the daisy wheel of a daisy wheel printer. [3]
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