JP2507081Y2 - Drawing head of automatic drafting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an image drawing head of an automatic drafting machine.

[Prior art and its problems] The drawing head, which is able to automatically feed out the lead core according to its consumption, can be used until the lead core in use is shortened (0.5 mm , With HB lead core 1
It can be said that it is suitable as a drawing head for an automatic drafting machine because it can be used for writing around 00m. Such a drawing head has a ball chuck mechanism fixed in the holder, which allows the lead core to move forward, but can prevent the lead core from moving backward by a wedge action. A slidable slider that is biased is placed in the front part of the holder, and after writing, the front end surface of the slider is separated from the paper surface, and the holding member inside the slider that returns can be pulled out from the ball chuck mechanism while holding the lead core. It is like this.

However, in the conventional drawing head described above, although the lead core already gripped by the ball chuck mechanism can be sequentially advanced to the front according to wear, a new core such as a second core is continuously used. You cannot do it. In order to be able to use such a new core, a new core standing by behind the ball chuck mechanism can be dropped into the ball chuck mechanism in the expanded state, and
It is necessary to allow the lead core (residual core) that has come out of the ball chuck mechanism to be pushed forward and to be advanced a predetermined length while the new core discharged from the slider is held by the ball chuck mechanism.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and can use the lead cores already gripped by the ball chuck mechanism to sequentially move forward according to wear. Of course, it is intended to provide a drawing head that enables the use of a new core such as a second core, and the main point is that the lead core can be moved forward but its retraction can be prevented by a wedge action. A ball chuck mechanism arranged inside the holder, and a slider having a holding member in front of the ball chuck mechanism is urged forward by a slider spring so as to be slidable. An arm that exposes the arm is provided so as to interlock with the chuck ring of the ball chuck mechanism, and when the chuck ring and the chuck body move backward together with the arm, An abutting portion for restricting the backward movement of the chuck body is provided in the holder as an image drawing head of an automatic drafting machine.

[Examples] Hereinafter, examples will be described in more detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates an inwardly stepped contact portion.
A holder 1a is formed, and a tip 2 is screwed to the front. Inside the tip 2 is provided a slider 4 which is biased forward by a slider spring 3 which is interposed between the tip 2 and a ball chuck mechanism which will be described later, and which is slidably arranged in the tip 2. A lead core holding member 5 made of synthetic rubber or the like is provided inside the slider 4. 6
Is a ball chuck mechanism arranged behind the slider 4 in the holder 1, and the ball chuck mechanism 6 is divided into a plurality of parts in the front part and can be opened and closed. Chuck body 7 that can be gripped
A trochanter 9 placed on a dish-shaped seat 8 formed on the outer surface of the head of the chuck body 7, and an inclined surface 10 capable of slidingly guiding the trochanter 9 and closing the chuck body 7. The chuck ring 11 has a chuck ring 11 and a chuck spring 12 that biases the chuck body 10 rearward with respect to the chuck ring 11. The ball chuck mechanism is a knock spring.
An arm portion 14 that is urged forward by 13 and that is exposed from the hole 2a of the tip metal 2 is continuously fixed to the chuck ring 11. The arm portion 14 has a chuck ring 11 as shown in FIG.
It may be in a contact state without being fixed to.

 Next, the operation will be described based on the configuration described above.

In FIG. 1, the arm portion 14 may be pressed backward with a fingertip or the like, but it is preferable to set the diameter of the slider 4 to a position where the drawing head moves and stops when the drawing head cannot be written on the drawing table A. A large hole having an appropriate size smaller than the diameter of the arm portion 14 is provided, and when the drawing head is located on the hole, the arm portion 14 is operated to be pressed against the stepped portion of the hole. As a result, the arm portion 14 moves rearward against the elastic force of the knock spring 13. At this time, the ball chuck mechanism 6 to which the arm portion 14 is fixedly connected is also moved at the same time. In this movement, the chuck body 7 is retracted against the elastic force of the chuck spring 12, and the contact portion formed inside the rear of the holder 1
The retracting movement of the chuck body 7 is restricted by abutting against the la, and the elastic expanding force of the chuck body 7 or the front end taper portion 15 as shown in the drawing is fixed to the front end of the chuck ring 11 and the rear end taper portion 17 of the end member 16 is fixed. The lead core L is opened by releasing the lead core L (see FIG. 2).

After that, when the pressing of the arm portion 14 is released, the chuck ring 11 is returned by the elastic force of the knock spring 13 until it comes into contact with the end surface of the tip metal 2, and the chuck body 7 is moved by the chuck spring 12
It will be returned by the elastic force of and will hold the lead core. In the returning process, the lead core L can be advanced by a predetermined length while being held by the ball chuck mechanism 6. Further, as described above, it becomes possible to expand only the chuck body 7 of the ball chuck mechanism 6, so that the lead core L that is sequentially fed forward due to the wear caused by writing and slipped out of the ball chuck mechanism 6.
Can be dropped into the ball chuck mechanism 6 following it, and gradually pushed forward by the gripped new core and discharged from the tip of the slider 4. In addition, if a hole having an appropriate size, which is larger than the core diameter and smaller than the diameter of the slider 4, is provided on the drawing table A, the hole of this hole is pressed before pressing the arm portion 14 in the above operation. If the slider 4 is pressed against the step and the core is made to protrude from the tip of the slider 4 to some extent, the core can be discharged faster than by pressing only the arm portion 14. Also, multiple new cores may be stored in the core tank 18 connected to the rear, but there is a risk that the storage core will be damaged by vibration during writing, so if you do not like this, when using the new core The tank 18 may be replenished.

 Next, another embodiment will be described.

4 and 5 are different from FIG. 1 in that the arm portion 14 is exposed in the vertical direction of the chuck ring 11 and is slidably provided in the slit 15 provided outside the holder 1. is there. The basic operation is the same as in the above embodiment,
If the automatic drafting machine is provided with a means for moving the arm portion 14 rearward, it becomes easier to utilize. The position at which the arm is provided is not limited to the above-mentioned embodiment, and various positions can be used as long as the chuck ring can be moved backward.

[Advantages of the Invention] As described above, according to the present invention, the ball chuck mechanism can be moved backward by the rearward movement of the arm portion to expand the chuck body. Since it is possible to move forward by a predetermined length while being held by the mechanism, a new core standing by behind the ball chuck mechanism can be dropped into the ball chuck mechanism in an expanded state, and the new core can be moved. Since the lead core (remaining core) that has come out of the ball chuck mechanism can be gradually pushed forward with a new core held by the ball chuck mechanism, it can be ejected from the slider. it can. Thus, the new core such as the second one can be continuously used by a simple pressing operation.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing an operation, and FIGS. 3, 4, and 5 are sectional views showing other embodiments. 1 ... Holder, 1a ... Contact part, 2 ... Tip metal 3 ... Slider spring, 4 ... Slider 5 ... Holding member, 6 ... Ball chuck mechanism 11 ... Chuck ring 13 ... Knock spring, 14: Arm L: Lead core

Claims (1)

(57) [Scope of utility model registration request] 1. A ball chuck mechanism, which allows the lead core to move forward but prevents the lead core from moving backward by a wedge action, is arranged in a holder, and a slider having a holding member is provided in front of the ball chuck mechanism as a slider. In a drawing head that is urged forward by a spring and slidably arranged, an arm portion that partially exposes from the holder is provided so as to interlock with a chuck ring of the ball chuck mechanism, and a chuck is provided together with the arm portion. An image drawing head for an automatic drafting machine, wherein an abutting portion for restricting the retreat operation of the chuck body when the ring and the chuck body are retracted is provided in the holder.