ERASER INSTEAD OF SODAThe different orders had to perform for the last time a Cup “Junior technician”, school № 81 of the city of Gorky. This one was especially unusual and interesting. Heads of school rooms of manual labor, drawing, and painting turned to our designers to develop machines for selling pencils and erasers.

We held in the Cup competition. Of the proposed options were selected by simple and at the same time the most effective. The machines turned out trouble free in operation and simple to manufacture.
Their interaction was solved. so witty, that deserved a demonstration, and we made the case transparent, made of plexiglass. When I first was shown this machine one of the technical exhibitions near it were crowded with not only students but also teachers: studied, sketched, to do the same for their schools.
It may confirm any student: pencils and erasers needed for drawing lessons or drawing, you receive the same amazing property — at the right time you can’t find them neither in portfolio nor in the Desk or under the Desk. However, in our school it does not put the big goof was hot enough to go into the corridor and down a penny in the coin slot on the wall will be in the hands of a pencil eraser. Guys often approach these unusual stalls and just wanted to see how they work.
The device machines according to the principle of the interaction of the parts are the same. Therefore, we give a detailed description of only one pencil.
It’s a box made of plexiglass, size 300X220X23 mm, assembled with screws M3. Inside there is a cassette with a capacity of 20 pencils (in another machine — 10 erasers). Articulated pusher is made of copper tubing of Ø 4 mm, its forked pendant of brass wire Ø 2 mm. To the suspension are soldered emphasis from brass with a thickness of 1 mm. Return spring pusher — narrow steel strip (can be used from the old relay).
A block of coin is also made of Plexiglas, is attached to the main body by screws M3. It has a slot for tokens (coins), a button with a stem and a helical return spring made of wire Ø 0,5 mm. To one end of the rod is soldered a length of wire Ø 1,5 mm — to push coins, and the other end of the button spring.
Machine for sale pencils:
1 — housing. 2 — the outlet of the cassette, 3 — pencils 4 — feed opening, 5 — cassette. 6 — spring, 7 — slot coin slot. 8 — button with a spring, 9 — block coin-operated, 10 — suspension of the pusher 11, the pusher. 12 — box office drive. 13 — cover the till, a 14 — screw-lock, 15 — emphasis.

When assembling it is necessary to adjust the free play of the follower, the parts moved without difficulty.
Load the tape machine through the upper hole existing on the back side. To bring the mechanism into action is omitted in the slot token (coin): he stands by the edge of the abutment of the follower. Now press the button. Force via the token is passed to the pusher, the pressure on the pencil and pushes it through the bottom hole of the cassette.
Thereafter, the token falls into the till drive and the spring returns the pushrod and the button to its original position. At the bottom of the cassette went to another pencil — the machine is ready for re-action.
The mechanisms of such devices mainly differ in the dimensions of the main elements that depend on the size of the eraser or other objects, for example, notebooks, pens, ballpoint pins, pens, sharpeners.
This principle can work the machines installed, for example, in the school cafeteria: they are able to sell biscuits and chocolates. They are, obviously, other areas of application.
I. CHUIN, head of club “Young technician”, school № 81, Gorky

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