What Is an Autopen?

There is a spring in the mechanical pencil. Before use, a fine refill made of graphite (commonly known as lead core) must be placed. After putting in the refill, close the back cover to prevent the core from falling out. Press the back cover to make the refill extend from the fixed length of the front end and write the same thickness.

Automatic pen

There is a spring in the mechanical pencil.

In 1919, Syunichi Nakata, an imported pen collector, opened a small pen store in Okayama, Japan, and his store was a success. In 1924, he moved to Tokyo, near several pen manufacturers, and officially named his company: Nakaya Seisakusho. Since then, the company has grown beyond imagination and has 80 employees. So Nakata changed the company name "PlatinumPen Company", which is the famous platinum medal. Platinum originally sold pens through mail-orders, with office workers and teachers in small villages throughout Japan. Soon, they exported to Singapore, Hong Kong, and Eurasia.

During the mid-1930s, Nakata organized a group of artists specializing in creating pens.

During this period Platinum produced various dill paint pens, including lacquer carvings, pearl inlays and pens with the rough volcano type of Kanshitu surface. Platinum developed a water-based ballpoint pen in 1948. Since then, platinum fountain pens have been the most exported pen factory in Japan.

In 1957, platinum first made pens with pen belly.

In 1966, Nakata developed a stylus.

The world's first mechanical pencil was in 1822

The movable pencil is divided into thick core (greater than 0.9m) and fine core (less than 0.9m) according to the diameter of the pencil. According to the core-out method, it can be divided into falling core type, rotary type, pulsating type and automatic compensation type, and 4 kinds of movable pencils. The drop core type automatically pulls out the lead core by the gravity of the lead core. Rotary conveying lead core by rotation. The pulsation type (swing type) relies on the movement of the lead core. The structure has a one-time type, that is, the lead core is moved out once. Two-movement type, the first movement of the nib to extend the pen, the second movement of the lead core to extend. Double chuck swing type, using double chuck structure, shortens the distance between the chuck head and the tip of the pen tip, so that the last remaining lead of 8 to 15mm in the movable pencil can be used to produce a whole lead The core pushes it out for continuous writing. The automatic compensation type (automatic core removal) does not require a rotation or pulsation device, and can automatically compensate the lead core for continuous writing.

The pulsating movement structure is the basic structural form generally used by movable pencils, and is mainly composed of a pen barrel, a pointed sleeve, a core protection tube, a chuck, a locking hoop, and a spring (see the pulsating movable pencil structure diagram). When the core tube is subject to throbbing pressure (finger pressure), it moves downwards against the elastic force of the spring and opens the chuck claws. At the same time, the lead core leaves its original position in the core tube by its own gravity. It is moved along the core tube wall by a certain length under the control of the damping ring of the braking element. After the pressure is released, the spring returns to its original position, the lead core is automatically locked and positioned by the locking hoop and the chuck, completing a pulsating core-out process. The reciprocating movement can be continuously pulsed out of the core.

The special lead of the thin-core movable pencil has the characteristics of high flexural strength and good writing performance. It mainly uses synthetic resin as the lead core binder. Commonly used are polyvinyl alcohol, asphalt, furan resin, polyvinyl chloride, ABC resin, vinyl chloride-vinyl acetate copolymer, etc .; graphite is used as the lead colorant; Common solvents are water, ethanol, etc .; dioctyl phthalate, tricresol phosphate, etc. are often used as plasticizers to reduce the flow viscosity of the resin at high temperatures and improve the molding performance; lead stearate is often used. As a stabilizer, it can prevent the resin from aging and inhibit the oxidation process. It uses liquid paraffin and low molecular polyethylene as lubricants to improve the flowability of the resin melt.

The resin fine lead core is manufactured under high temperature baking and carbonization under the protection of an inert gas (such as argon) or sealed conditions to form a graphitized structure, which has high mechanical strength and good writing performance.