JP2541841Y2 - Pen for automatic drafting machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen for an automatic drafting machine which is mounted on an apparatus main body such as a plotter via an adapter, and which has a press-fit portion into the adapter near a pen tip of a pen tip holder.

[0002]

2. Description of the Related Art Although some pens for automatic drafting machines are used exclusively for automatic drafting machines, many pens are not exclusively used for automatic drafting machines but also used for handwriting, for example, using a scriber. Have been able to. For this reason, many devices are attached to the device main body via an adapter.

[0003] The adapter also improves the positioning of the pen with respect to the apparatus body. In other words, in order to satisfy the above-described handwriting characteristics, the portion of the pen tip holder near the pen tip must be made relatively long. If such a part is formed, bending will inevitably occur, and if it is not corrected, the handwriting will be disturbed due to pen replacement. By doing so, the positioning of the pen with respect to the apparatus main body is indirectly improved.

For this purpose, it is, of course, necessary to attach the pen to the adapter with good positioning, and it is most common to use a portion near the pen tip of the pen tip holder as a press-fit portion into the adapter. Means.

[0005]

The portion of the pen tip holder near the pen tip not only bends, but also has a constant diameter. Even if the above correction is performed by using the part as a press-fitting part to the adapter, there is necessarily a limit.If the inner diameter of the adapter to be press-fitted is set to be large, correction may not be possible due to insufficient press-fitting. However, if it is set to a smaller value, some parts cannot be press-fitted.

[0006]

A groove is formed radially on the peripheral wall of the press-fitting portion, the groove increasing in size toward the pen tip. That is, the present invention
A pen for an automatic drafting machine attached to an apparatus body via an adapter, which has a press-fitting portion for the adapter near a pen tip of a pen-tip holder made of an injection-molded product of a synthetic resin. A pen for an automatic drafting machine is characterized in that a groove that becomes larger toward the pen tip side is provided radially on the peripheral wall.

[0007]

According to the groove provided in the peripheral wall, the press-fitting portion is more likely to be bent to correct the bending toward the pen tip side, and exhibits elasticity for stabilizing the press-fitting.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a pen A has two front and rear steps 1, 2 engaged with a front member 3 and a rear member 4 of an adapter B which are screwed to each other to prevent the pen A from moving forward and backward. Reference numeral 5 denotes a flange for attachment to the apparatus main body.

A portion of the pen A that linearly projects from the step 1 is a press-fitting portion 7 for the mouth 6 of the adapter B.
A groove 8 is provided in the peripheral wall of the press-fitting portion 7.

As shown in FIGS. 2 and 3, the groove 8 is
Four are provided radially deeper toward the side. Also, although it is formed longer than the mouth 6 of the adapter B to be press-fitted,
In this case, the air exchange path is also used.

The member having the groove 8 is the pen point holder 10, which is formed by injection molding of a suitable synthetic resin such as polyethylene, polypropylene, nylon, polyacetal and ABS resin. In the figure, the shaft cylinder 11 is press-fitted and fixed, but may be an appropriate body such as being integral with the shaft cylinder 11.
In the drawing, the pen tip of a small tube type writing instrument comprising a needle body 12 and a small tube 13 having self-elasticity is shown as the pen tip 9, but any other suitable tip such as a ball pen tip may be used. Reference numeral 14 indicates an ink relay core, while pen A is
A so-called raw ink type, batting type, or other appropriate type may be used.

FIGS. 4 and 5 show another example. The groove 8 provided in the pen tip holder 10 is wider toward the pen tip 9. It is the same as the previous example in that the pen tip side is larger. Further, as an example showing that the number of grooves 8 provided radially is appropriate, the number of grooves 8 in the drawing is three.

Various other methods can be used. For example, a pen may be attached to the adapter by screwing without moving back and forth.

[0014]

The pen for an automatic drafting machine according to the present invention is a pen for an automatic drafting machine attached to an apparatus body via an adapter, and is located near a pen point of a pen point holder made of a synthetic resin injection molded product. Having a press-fitting part to the adapter,
Since the groove which becomes larger toward the pen tip side is radially provided on the peripheral wall of the press-fit portion, the press-fit can be stably press-fitted into the adapter, and the bend can be sufficiently corrected by the adapter.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention with an adapter section.

FIG. 2 is an enlarged vertical sectional view of a tip of the pen in FIG. 1;

FIG. 3 is a cross-sectional view taken along the line II of FIG. 2;

FIG. 4 is a perspective view of a main part showing another example of the present invention.

FIG. 5 is a cross-sectional view of the pen of FIG. 4 corresponding to FIG. 2;

[Explanation of symbols]

 A Pen 1 Step 2 Step 7 Press-In 8 Groove 9 Pen Tip 10 Pen Tip Holder 11 Shaft 12 Needle 13 Small Tube 14 Ink Relay Core B Adapter 3 Front Member 4 Rear Member 5 Flange 6 Mouth

Claims (1)

(57) [Scope of request for utility model registration] 1. A pen for an automatic drafting machine which is mounted on an apparatus body via an adapter and which has a press-fitting portion to the adapter near a pen tip of a pen tip holder made of a synthetic resin injection molded product. A pen for an automatic drafting machine, wherein a groove which becomes larger toward the pen tip side is provided radially on a peripheral wall of the press-fitting portion.