JPH0337996Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a turret tube for holding a lead in a drawing instrument.

As shown in the first figure, in the conventional device, holders 3, 3, . The cores 2, 2, . However, such friction rings 4 are expensive and require a large number of them, and the work of inserting many friction rings 4, 4, . . . into the holders 3, 3, .

The present invention eliminates this drawback by frictionally braking all the cores at once using one large friction band.

One embodiment will be described below with reference to FIG. 2. A turret cylinder 11 is fitted into a fixed shaft 10 so as to rotate and move up and down. This turret tube 11
consists of a pair of inner cylinder 12 and outer cylinder 13, and between these inner cylinder 12 and outer cylinder 13 are formed vertical grooves 15, 15, . . . for inserting cores 14, 14, .
A portion of the lower part of the outer cylinder 13 is cut out to expose the core 14, and a conical rubber band 16 is wrapped around the upper side of the cutout 20 to hold the core 14 so that it does not move loosely by its frictional force. In the figure, reference numeral 17 denotes a tailstock device made of wire or the like, and a through hole 18 is provided below the tailstock device through which the core 14 projects.

Next, the operation of this device will be explained. When the turret tube 11 is stopped, the tailstock device 17 presses the core 14.
Push the upper end downward to make the lower end protrude from the through hole 18. When the effective length of the core 14 is completely paid out and worn out, the turret tube 11 is slightly raised by a mechanism not shown, and the lower part of the core 14 escapes from the through hole 18. Next, the turret tube 11 is rotated so that the next new core 14 comes to a position directly above the through hole 18, and the core 14 is pushed out downward little by little by the tail pushing device 17.

According to the present invention, all the cores are wrapped around one large friction band and frictionally braked all at once, so it can be easily assembled using inexpensive parts, and the number of parts and assembly work can be greatly reduced. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional turret tube, FIG. 2 is a perspective view of an embodiment of the present invention, and FIG. 3 is a sectional view of the lower part thereof. 11...turret cylinder, 12...inner cylinder, 13...
...outer cylinder.

Claims (1)

[Scope of utility model registration request] The turret tube consists of an inner tube and an outer tube. A vertical groove is provided between the inner tube and the outer tube to insert the core in order to move it up and down. A part of the outer tube is cut out to expose the core and the exposed part is A turret tube for holding the lead in a drafting instrument with a friction band wrapped around the outside.