JPS6142880Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pen end entry/exit device for a writing instrument in which the brush end is divided into several stages and exposed from the tip of the barrel.

Conventionally, there is a writing instrument disclosed in Japanese Patent Publication No. 34-7181 that allows the end of the brush to be exposed from the tip of the barrel, but this has a cylindrical cam with a vertical groove and a plurality of cam teeth on the inner surface of the barrel. A presser element movable only in the longitudinal direction is fitted into the shaft cylinder, a transfer cam having a plurality of radial cam teeth is formed on the end surface of the presser opposite to the pressing side, and A rotor that is pressed by the writing body pushed up by a spring is inserted into the cylinder, and teeth are formed on the outer peripheral surface of the rotor that face the transfer cam, engage the cylindrical cam, and slide in the vertical groove. Because of the structure, the exposed length of the writing part remains constant and cannot be adjusted.

For this reason, by adjusting the exposed length of the brush end from the barrel of a ballpoint pen or sharp pencil in several stages according to your preference, you can adjust the exposed length when placing the writing tip on a ruler to draw a line correctly. Proposals have been made to lengthen the lead to reduce the amount of blind spots, and to shorten the exposed length of the lead when writing with force, in order to prevent the lead from breaking. ).

However, in this proposal, the cam teeth of the cylindrical cam are displaced in steps in the longitudinal direction of the shaft cylinder, and the rotor that pushes the writing is locked in several stages. By employing a presser with a plurality of end faces that face each other and a rotor that has a plurality of oblique end faces, the movement of the rotor in several steps can be performed by one diagonal end face of the presser. Therefore, the maximum amount of exposure of the brush end is limited to the amount of exposure of the presser protruding from the rear end of the barrel. In order to increase the amount of exposure of the brush end, the amount of exposure of the presser element may be increased, but this deteriorates the operation and appearance of the writing instrument. Under such constraints where the amount of exposure of the presser cannot be increased, the problem with this proposal is that it is not possible to increase the amount of exposure of the brush end.

This invention was made in order to solve the above-mentioned problem, and is intended to provide a brush end insertion/extraction device in which the brush end is exposed more than twice as much as the amount of exposure of the presser. That is, this invention (A) forms a cylindrical cam with a longitudinal groove and a plurality of cam teeth on the inner surface of the shaft cylinder, and (B) inserts and inserts a presser into the shaft cylinder so that it can move freely only in the longitudinal direction. (C) A transfer cam having a plurality of radial cam teeth is formed on the end surface of the presser opposite to the pressing side, and (D) The transfer cam is further pressed against the writing body pushed up by a spring inside the barrel. (E) teeth are formed on the outer peripheral surface of the rotor, facing the transfer cam, engaging the cylindrical cam, and sliding in the vertical groove; In the apparatus, the plurality of teeth of the cylindrical cam are arranged such that at least a first
It consists of a cam tooth and a second cam tooth, and a second cam tooth.
With the cam teeth on the writing side, the second cam teeth, the first cam teeth, and the longitudinal groove are displaced stepwise in the longitudinal direction of the shaft cylinder in this order, and the plurality of cam teeth of the transfer cam are aligned with at least the first cam teeth. and second cam teeth, with the second cam teeth on the writing side, and the second cam teeth and the first cam teeth are displaced stepwise with respect to the longitudinal direction of the cylindrical cam, and the vertical groove of the cylindrical cam is The transfer cam is fixed at a position along the moving direction of the first cam teeth, and when there are teeth of the rotor in the vertical groove, the first cam teeth are pressed to move the first cam teeth of the cylindrical cam to the first cam teeth of the transfer cam. This is a pen end entry/exit device for a writing instrument, in which the cylindrical cam is fixed at a passing position of a first cam tooth and a second cam tooth, and the second cam tooth of the cylindrical cam is fixed at a passing position of a second cam tooth of the transfer cam.

Next, this invention will be explained with reference to the drawings.

1 is a shaft cylinder with an opening 2 at the tip;
A cylindrical cam 3 is provided on the inner surface of the opposite end. The cylindrical cam 3 is configured by, for example, dividing the inner circumference of the inner surface of the shaft cylinder 1 into two equal parts, each having a longitudinal groove 4 and two following two first cam teeth 5 and second cam teeth 6. With the cam teeth 6 on the writing side, the cam teeth 6, the cam teeth 5, and the vertical grooves 4 are displaced stepwise in the longitudinal direction of the barrel 1 in this order.

Reference numeral 7 denotes a bottomed cylindrical presser fitted into the shaft cylinder 1, and a transfer cam 8 is provided on the end surface opposite to the press side. The transfer cam 8 divides the end face of the presser into two equal parts, each having two first cam teeth 9 and two second cam teeth 10.
and one auxiliary cam tooth 11, with the second cam tooth 10 on the writing side and the second cam tooth 10 and the first cam tooth 9 on the shaft cylinder. 1 is displaced stepwise in the longitudinal direction. Two protrusions 12 are symmetrically provided on the outer circumferential surface of this presser 7, and engage with the longitudinal grooves 4, 4 of the cylindrical cam 3, respectively, to move the presser 7 only in the longitudinal direction of the shaft cylinder 1. That's what I do.

Reference numeral 13 denotes a rotor inserted into the shaft cylinder 1, and is pressed by the writing body 15 pushed up by a spring 14. Two teeth 16 provided symmetrically on the outer peripheral surface of the rotor 13 are connected to a cylindrical cam. 3 respectively,
It is arranged so as to face the transfer cam 8 and to be able to slide in the vertical groove 4.

Then, the vertical groove 4 of the cylindrical cam 3 is fixed at a position along the moving direction of the first cam tooth 9 of the transfer cam, and when there is a tooth 16 of the rotor in the vertical groove 4, the first cam tooth 16 presses the cylindrical cam. The first cam tooth 5 of the cylindrical cam 3 is fixed at a position where the first cam tooth 9 and the second cam tooth 10 of the transfer cam 8 pass, and the second cam tooth 6 of the cylindrical cam 3 is fixed at a position where the first cam tooth 5 of the cylindrical cam 3 passes through the second cam tooth 10 of the transfer cam 8. It is fixed in the passing position.

A spring 17 is arranged between the rotor 13 and the presser 7 and contacts both of them.
is configured to be movable in the longitudinal direction of the shaft tube 1.

Now, when the brush end is retracted in which the teeth 16 of the rotor 13 are accommodated in the longitudinal groove 4, the teeth 16 of the rotor 13 are opposed to the cam teeth 9 of the presser 7 as shown in FIG. shall be taken as a thing. When the pusher 7 is pressed, the cam teeth 9 push down the teeth 16, so the teeth 16 reach the cam teeth 5 of the cylindrical cam 3 (at this time, the teeth 16 reach the cam teeth 5 in FIG. 7, and the cam teeth 9 reach the cam teeth 5 in FIG. 7). ).

Next, when the presser 7 is released from the pressure, the tooth 16 that has separated from the cam tooth 9 slides along the inclined surface of the cam tooth 5, and the writing body 15 advances one step (at this time, the cam tooth 9 moves as shown in FIG. 7). C, tooth 16 is in position d in FIG. 7).

Next, when the presser 7 is pressed, the cam teeth 10 push down the teeth 16, so the teeth 16 reach the cam teeth 6 (at this time, the teeth 16 are e in FIG. 8, and the cam teeth 10 are e in FIG. 8 f). position).

Next, when the presser 7 is released from the pressure, the tooth 16 detached from the cam tooth 10 slides along the inclined surface of the cam tooth 6, and the writing body 15 further advances to the first position.
The state shown in the figure is reached (at this time, the cam teeth 10 are in the position g in Fig. 8, and the teeth 16 are in the position h in Fig. 8).

Furthermore, when the pusher 7 is pressed, the cam teeth 10 push down the teeth 16, so that the teeth 16 separate from the cam teeth 10, are temporarily received by the cam teeth 11, are decelerated, and return to the state shown in FIG. 6 again. Cursive 1
5 is inserted into the shaft cylinder 1.

As is clear from the above explanation, the two sets of cam teeth of the transfer cam of the pusher share the responsibility of moving the rotor through several stages, and the teeth of the rotor are sequentially slid onto the two sets of cam teeth of the cylindrical cam. Therefore, the amount of exposure of the depressor may be equivalent to the distance between the two sets of cam teeth, and therefore, the exposure of the end of the writing brush can be increased with a short depressor. In addition, in this invention, three sets of cam teeth are formed for each of the cylindrical cam and the transfer cam, and by sequentially displacing these cam teeth in the longitudinal direction of the barrel, it is also possible to expose the brush end in three stages. It is. The success of increasing the exposure of the end of the cursive writing brush with such a short depressor is due to the fact that the diameter of the writing font is much larger than that of writing fonts such as ballpoint pens and sharp pencils, and as a result, the barrel that accommodates it is also required. This can be very effective when applied to applications such as cap press type fountain pens, which require the use of thick pens that tend to create blind spots.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a writing instrument equipped with the device of this invention, with the middle part omitted, and Figure 2 is a diagram taken from Figure 1 A-A.
3 is a sectional view in an operating state corresponding to FIG. 2, FIG. 4 is an explanatory diagram of the rotor and presser used in this invention, and FIG. 5 is a diagram showing the cylindrical cam used in this invention. 6 to 8 are exploded views of the transfer cam of the pusher and the cylindrical cam of the shaft, which illustrate the operation of the projections of the rotor. 1... Shaft cylinder, 3... Cylindrical cam, 4... Vertical groove of cylindrical cam, 5, 6... Cam teeth of cylindrical cam, 7... Pusher, 8... Transfer cam, 9, 10... Transfer Cam teeth of the cam, 13...rotor, 14...spring,
15...cursive, 16...rotor teeth.

Claims (1)

[Claims for Utility Model Registration] (A) A cylindrical cam 3 having a vertical groove 4 and a plurality of cam teeth is formed on the inner surface of the shaft cylinder 1, (B) It is movable only in the longitudinal direction within the shaft cylinder. (C) A transfer cam 8 having a plurality of radial cam teeth is formed on the end surface of the presser opposite to the pressing side, (D) Furthermore, a spring 14 is installed in the shaft cylinder. (E) A rotor 13 is inserted into the rotor 13 to be pressed by the writing body 15 that has been pushed up. tooth 1
6, in which a plurality of cam teeth of the cylindrical cam are connected to at least a first
It is composed of cam teeth 5 and second cam teeth 6, and the second cam teeth 6, first cam teeth 5, and vertical grooves 4 are stepped in the longitudinal direction of the barrel in this order, with the second cam teeth 6 on the writing side. changing the plurality of cam teeth of the transfer cam to at least a first
Consisting of cam teeth 9 and second cam teeth 10,
With the second cam teeth 10 on the writing side, the second cam teeth 10 and the first cam teeth 9 are displaced stepwise with respect to the longitudinal direction of the cylindrical cam, and the vertical groove 4 of the cylindrical cam is aligned with the first cam of the transfer cam. It is fixed at a position along the moving direction of the teeth 9, and when there are teeth 16 of the rotor in the longitudinal groove 4, it is pressed by the first cam teeth 9, and the first cam teeth 5 of the cylindrical cam are pressed against the first cam of the transfer cam. A pen end entry/exit device for a writing instrument, which is fixed at a position where teeth 9 and second cam teeth 10 pass, and second cam teeth 6 of the cylindrical cam are fixed at a position where second cam teeth 10 of the transfer cam pass.