SU1220821A1 - Arrangement for sharpening graphite cores - Google Patents

Description

f

The invention relates to sanding equipment, mainly used for sharpening pencil leads.

The purpose of the invention is to increase the convenience in use and quality of sharpening,

FIG. 1 schematically shows a device for sharpening graphite rods, general view; in fig. 2 view A in FIG. one.

The device comprises a housing 1, a lid 2 with a series of guiding holes 3 for inserting the leads, two abrasive washers 4 and 5, each of which has a conical tapering surface B, a dust collector 6 and a rotational drive of the abrasive washers 4 and 5, kinematically connected with each of them by means of a transfer element 7 with a power device .8 and supporting elements 9 and 10.

In addition, the abrasive washers 4 and 5 are set so that they are turned one to the other by sharpening surfaces B, and the axis of rotation of one of the THEM is located to the axis of rotation | the other at an angle c (Fig. 2), the value of which is determined by the formula

oL 2arcsin aol

- S.

de s

la

iri

2D

the greatest gap between abrasive washers 4 and 5;

the smallest gap between abrasive washers 4 and 5;

diameter of the smaller base of the conical grinding surface of the abrasive washer.

122082

to

The number of guide holes | their location along the length of the gap between the abrasive washers 4 and 5 and the sizes of the abrasive washers 4 and 5 are chosen from the conditions for providing the required range of sharpening pencil leads; the shape of the standard holes 3 is identical to that of the standard pencil holes made a mark that informs about sharpening parameters. The dust collector 6 has a device for cleaning the stylus from graphite dust, made in the form of an elastic 13 elastic film with a cut (not shown) attached to the back surface of the lid 1 2 with the ability to interact with the stylus when it is removed from the guide hole 3. It is possible to control the speed of rotation abrasive washers 4 and 5, depending on the hardness of the leads, as well as the use of cutting edges instead of an abrasive as a sharpening element.

The use of a device for sharpening graphite rods is that, guided by the marks by 2, the pencil lead is inserted through the guide hole 3 all the way into the conical grinding surfaces B of each of the abrasives 4 and 5. At the same time, the surfaces B grind part

II

20

25

thirty

35

40

the stylus, giving it the shape of a scapula as the stylus moves into the gap between abrasive washers 4 and 5. The dust collector 6 discharges graphite dust, which is removed by periodically cleaning the container of the dust collector 6 when it is removed from the housing 1. the cone stylus is rotated after stopping the grinding surfaces B.

B /

By b

Editor N.Shvyschka

Compiled by S. Moskalev

Tehred A.AlievKorrector} M.Sharoti,

Order 1522/13 Circulation 345 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Fi & 2

Claims (1)

A device for sharpening graphite rods, comprising a housing with a cover having a series of guide holes for introducing a stylus into the gap between abrasive washers mounted in the housing rotatably, sharpening surfaces facing one another, and a rotation drive of abrasive washers, characterized in that, with In order to improve ease of use and quality of sharpening, abrasive washers are located obliquely to one another with the formation of a variable gap between opposite abrasive surfaces made of conical Several rows of guide holes of the cover are located along the length of the gap between the abrasive surfaces, and the rotation drive is kinematically connected to each of the abrasive washers with the possibility of their rotation in opposite directions. ND ND CD XU ND Μ>