JPH0593891U - Drawing head of automatic drafting machine - Google Patents

Abstract

(57) [Summary] [Structure] A lead core feeding means provided with a chuck body capable of feeding a lead core into a barrel, and a lead tank for storing the lead core behind the lead core feeding means. An image drawing head of an automatic drafting machine having a double-threaded screw portion formed on the inner rear surface of the shaft cylinder, and a core tank joint screwed to the double-threaded screw portion is arranged behind the chuck body. Along with this, the drawing head of an automatic drafting machine has a step formed on the inner surface of the core tank joint. [Effect] Even when the automatic drafting machine is installed horizontally or when it is installed at an angle of about 60 degrees, the second lead core can be reliably supplied into the chuck body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic drafting machine having a lead core feeding means provided with a chuck body capable of feeding the lead core, and a lead tank for storing the lead core behind the lead core feeding means. The present invention relates to a drawing head.

[0002]

[Prior Art]

 Conventionally, Japanese Utility Model Laid-Open No. 54-142545 has been known as an example of an image drawing head of an automatic drafting machine. More specifically, lead core feeding means including a chuck is arranged inside the outer shaft. Behind the chuck, a lead tank (rear part of the chuck) capable of storing (preliminary lead) a plurality of lead cores is continuously provided, and the lead core is smoothly inserted into the lead tank. It has an inclined surface (step of the chuck; generally about 120 degrees) so that it can be inserted into the hole.

Further, in Japanese Utility Model Laid-Open No. 61-12795, a core guide pipe having a diameter substantially the same as that of the core is arranged behind a ball chuck mechanism which is a lead core feeding mechanism, and a core guide pipe is used. -A drawing head of an automatic drafting machine is disclosed in which a lead is inserted into a ruchuck mechanism.

[0004]

[Problems to be solved by the device]

 Normally, the automatic drafting machine was installed and used in a horizontal position as described in FIG. 1 of Japanese Utility Model Laid-Open No. 142425/1979. However, in recent years, it has been preferred to use the automatic drafting machine at an angle of about 60 degrees to confirm the handwriting being drawn and to make it easier to confirm.

However, in the former case of the prior art described above, when the automatic drafting machine is tilted, the drawing head also tilts, and as a result, an inclined surface is formed between the chuck and the lead tank. The second lead core will not be able to get over the slope. As a result, the lead cores from the second lead onward could not be inserted into the chuck, making writing impossible.

Further, in the latter, even if the automatic drafting machine is tilted, the second lead core can be inserted into the ball chuck machine premises, and the longer the core guide pipe is, the more lead cores are stored. Although it could be stored, its length was limited and normally only two quantiles could be stored.

[0007]

[Means for Solving the Problems]

 The present invention has been made in view of the above problems, and is provided with a lead core feeding means provided with a chuck body capable of feeding the lead core into the barrel, and a lead core feeding means provided behind the lead core feeding means. A drawing head of an automatic drafting machine having a lead tank for storing a lead core, the lead tank joint comprising a double-threaded screw portion formed on a rear inner surface of the barrel and screwed into the double-threaded screw portion. Is arranged at the rear of the chuck body, and a step portion is formed on the inner surface of the core tank joint.

[0008]

【Example】

 A detailed description will be given below with reference to the accompanying drawings. FIG. 1 is a view when an image drawing head is attached to the automatic drafting machine 101, reference numeral 102 is an image drawing head holder, and a knock portion 103 is provided from the rear end of the image drawing head holder 102. It is protruding. Further, from the side surface of the automatic drafting machine 101, two pairs of arms 104 that hold the drawing head holder 102 and can move up and down are arranged at appropriate intervals. An abutting member 105 is provided on the automatic drafting machine 101 at a position facing the rear end of the knock portion 103 with a space therebetween.

Next, the drawing head will be described (see FIG. 2). A tip member 2 is screwed onto the tip of the barrel 1. An inner surface of the tip member 2 is biased forward by a slider spring 3 interposed between the tip member 2 and a general lead core feeding means (collet chuck mechanism) which will be described later, and the inner surface of the tip member 2. A slider-4 that can slide is arranged. Inside the slider-4, a lead core holding member 5 made of synthetic rubber or the like for lightly holding the lead core is provided.

Reference numeral 6 is a lead-core feeding means arranged in the barrel 1 behind the slider-4. The lead core feeding means 6 is provided with a joint member 7 which is divided into a plurality of parts on the front side and which can be opened and closed, and which can hold the lead core L when closed, and which has a lead core supply hole 7a formed at its rear end. The chuck body 8 includes a chuck body 8, a chuck ring 9 that opens and closes the chuck body 8, and a chuck spring 10 that biases the chuck body 8 backward with respect to the chuck ring 9.

Behind the lead core feeding means 6, inside the shaft cylinder 1, an inclined surface 11 and a core guide hole 12a and step portions 12b having different heights are formed on the inner surface (FIG. 3, FIG. 3). 4) A core tank 13 having a core tank joint 12 is arranged. Although the step portion 12b is formed directly on the inner surface of the core tank joint 12, it may be a separate member. On the outer wall of the core tank joint 12, there is formed a male screw portion 15 which is screwed with the double threaded screw portion 14 formed on the inner rear surface of the barrel 1. Further, behind the core tank 13, a knock portion 103 is attached to press the core tank 13 to feed the lead core L and to apply a rotational force to the core tank joint 12. Further, a wick tank cap 16 is removably press-fitted to the rear end of the wick tank 13 behind the knock portion 103.

The chuck spring 10 also serves to urge the lead tank 13 rearward via the lead tank joint 12, but a knock spring (not shown) is added to The tank joint 12 and the lead tank 13 may be biased rearward.

The operation will be described. When the knock member 103 is pressed by the contact member 105, the lead tank 13 moves forward and the lead tank joint 12 moves forward while rotating. The lead core L is lifted upward by the step portion 12b formed radially according to the rotating operation of the lead tank joint 12 (see FIG. 4), and when it rises to some extent, it falls along the inclined surface 11 due to gravity, and The lead core L is guided (falls) into the hole 12a.

By this pressing operation, the lead tank joint 12 presses the chuck body 8, and the lead core L is also fed.

Further, the radial step portion 12b is not limited to the above-mentioned embodiment, and as shown in FIGS. 5 and 6, the inclined surface 11 of the core tank joint 12 is conical toward the core guide hole 12a. -Shaped groove portion 17 may be formed. Further, as shown in FIGS. 7 and 8, a cross-shaped groove portion 18 may be formed on the inclined surface 11 of the core tank joint 12, and the step portions 12b, 1 thereof are formed. Various shapes are conceivable for the shapes of 7, 18 and are not limited to the present embodiment.

Next, the operation will be described. Similarly to the above-described embodiment, when the lead tank joint 12 is rotated by a knock operation, the lead core L loosely fitted in the groove 17 or the groove 18 is lifted and raised, and when it is raised (rotated) to some extent, the lead is inserted into the lead guide hole 12a. The core L falls.

[0017]

[Effect of the device]

 The present invention is an automatic drawing having a lead core feeding means having a chuck body capable of feeding a lead core inside a barrel, and a lead tank for storing the lead core behind the lead core feeding means. In the drawing head of the machine, a two-threaded screw part is formed on the inner rear surface of the barrel, and a core tank joint that is screwed into the two-threaded screw part is arranged at the rear of the chuck body, and the core is Since the step is formed on the inner surface of the tank joint, the second lead core can be reliably supplied into the chuck body even when the automatic drafting machine is installed horizontally or at an angle of about 60 degrees. it can.

[Brief description of drawings]

FIG. 1 is an external view showing an embodiment of the present invention.

FIG. 2 is a vertical half sectional view showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the lead tank joint in FIG.

FIG. 4 is a cross-sectional view showing the operation in FIG.

5 is a cross-sectional view corresponding to FIG. 3 showing another embodiment of the present invention.

6 is a cross-sectional view showing the operation in FIG.

FIG. 7 is a transverse sectional view corresponding to FIG. 3 showing still another embodiment of the present invention.

8 is a cross-sectional view showing the operation of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Tip member 3 Slider spring 4 Slider 5 Lead core holding member 6 Lead core feeding means 7 Joint member 7a Lead core supply hole 8 Chuck body 9 Chuck ring 10 Chuck spring 11 Inclined surface 12 Core tank joint 12a Core guide Hole 12b Step portion 13 Core tank 14 Rotation cam groove 15 Engagement portion 16 Core tank cap 17 Groove portion 18 Groove portion 101 Automatic drafting machine 102 Drawing head holder-103 Knock portion 104 Arm 105 Contact member L Lead core

Claims (1)

[Scope of utility model registration request] 1. Automatic drawing having a lead core feeding means provided with a chuck body capable of feeding a lead core into an axial cylinder, and a lead tank for storing the lead core behind the lead core feeding means. A streak head of a machine, wherein a two-threaded screw portion is formed on a rear inner surface of the shaft cylinder, and a core tank joint to be screwed into the two-threaded screw portion is arranged at the rear of the chuck body and the core thereof is provided. A drawing head for an automatic drafting machine, characterized in that a step is formed on the inner surface of the tank joint.