JPH04168097A - Writing head of automatic drawing machine and its lead supply - Google Patents

Abstract

PURPOSE:To ensure that following leads can be supplied without a special device by arranging a chuck ring which opens/closes a chuck holding a lead in a holder, and providing a knocking device interlocked to the chuck behind the chuck ring and a slider holding a lead forward of the ring. CONSTITUTION:If an arm 30 is moved upward and a knocking part 20 is pressed against a knocking member 40, a knocking tube 8 advances resisting the repulsive force of a knocking spring 9 and at the same time, a chuck 7 advances. As a result, the chuck becomes disconnected with a chuck, ring 6 and then becomes spread open. In this case, a lead L2 drops by its own weight from a lead tank, coming contact with a lead L1. Next, the arm 30 is moved downward, releasing a knocking operation. Subsequently, the chuck 7 becomes closed, holding the lead L2. After that, if a slider 4 is moved backward, the lead L1 protrudes from the tip of the slider 4 resisting the friction of a lead holding member 5. Then if the slider 4 is returned to its home position, a gap generates between the leads L1 and L2. If the knocking tube 8 is pressed, the chuck 7 becomes spread open and the lead L2 drops by its own weight by the gap. Next, if a knocking action is released, lead extraction operation is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a drawing head of an automatic drafting machine and its subsequent method for supplying lead cores.

[Prior Art] The drawing head of an automatic drafting machine has a pole chuck mechanism arranged in a holder that allows the lead core to advance but prevents its retreat by a wedge action. A slider that is biased forward by a slider spring is placed inside the front of the holder, and when the front end of the slider is released from the paper surface after writing, the lead holding member inside the slider returns to the pole while holding the lead lead. It is pulled out from a chuck mechanism, and the lead core can be automatically fed out as it wears out.

In order to operate as described above, the lead core must be held by the pole chuck mechanism and the lead core holding member. To grip the lead core in a pole chuck mechanism and feed the lead core to the tip of the slider 1 For example, Utility Model No. 62-180585
As disclosed in the publication, the chuck set itself is moved upward by rotating a gear that is threaded into a cylindrical body extending from the chuck set and forming a rack, and the chuck body is expanded. There is a method of feeding the lead core by dropping the lead core by its own weight to the lead core holding member and moving the chuck set forward again. In addition, the lead core (remaining lead) that has come off the pole chuck mechanism and is held only by the lead core holding member cannot be fed out, so it is discharged once and the second grain lead core is supplied using the method described above. I had to.

[Problems to be Solved by the Invention] However, the above-mentioned method requires a complicated device to move the chuck set backward and forward, leading to an increase in cost, and the contact position between the remaining lead and the following lead core. There was a problem in that when the lead core was located between the chuck and the lead core holding member, the abutment position would shift and the lead core would break.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and includes: (1) a chuck body for gripping a lead core and a chuck ring for opening and closing the chuck body, which are arranged in a holder; , disposing a knocking means rearwardly of the chuck body in conjunction with the chuck body, disengaging the fitting with the chuck ring, and releasing grip on the lead core; A slider having a lead core holding member is biased forward by a slider spring in front of the chuck body; The gist is that after the chuck body was released, the knocking means was released, and then the slider was activated.

[Example] A detailed explanation will be given below based on the accompanying drawings.

Figure 1 shows the drawing head attached to an automatic drafting machine, and shows the drawing head holder 10 with a tail plug screwed onto the rear end.
A knock part 20 is attached to the rear end of the. Further, the holder 10 is attached to an arm 30 that extends from the automatic drafting machine and moves the drawing head up and down. A knocking member 40 is provided at a position facing the rear end of the knocking part 20 so as to be vertically movable at intervals.

Next, the drawing head will be explained based on FIG. 2.

A tip 2 is screwed onto the front of the holder 1.

A slider 4 biased forward by a slider spring 3 is slidably disposed inside the tip 2.

Inside the slider 4, a lead core holding member 5 made of synthetic rubber or the like is provided. In addition, a lead core is gripped at the rear of the slider 4, and a chuck ring 6 is provided at the front.
A chuck body 7 having a core guide pipe 7a on its inner wall is arranged.

A knock pipe (
A wick tank) 8 is press-fitted into the knock pipe 8, and the knock pipe 8 is urged rearward by a knock spring 9. Further, a lead guide 13 is arranged between the lead core holding member 5 and the chuck body 7 so as to be movable back and forth. The core guide 13 is biased rearward by a slider spring 3. In other words, the slider 4 and the core guide 13 are tensioned by the slider spring 3. Incidentally, the lead core L that is separated from the chuck body 7 is held by the lead core holding member 5, and the following lead core L2 is waiting behind the chuck body 7 (see FIG. 2). Reference numeral 11 is a shock spring that prevents vibration when the printing head moves up and down.

Next, the operation will be explained.

In FIG. 1, first, the arm 3o is moved upward to press the knocking portion 20 against the knocking member 4o (knocking means actuation). When the knock part 2o is pressed, the knock pipe 8 moves forward (in the direction of arrow A in the figure) against the elastic force of the knock spring 9, and the chuck body 7 fixed in front of the knock pipe 8 moves forward. 6. When moving forward, the chuck body 7 is disengaged from the chuck ring 6 and expands. At this time, lead core L2
falls from the lead tank under its own weight and comes into contact with the lead lead L.

(See Figure 3). Next, when the arm 3o is moved downward and the knocking operation is released, the chuck body 7 is closed by the chuck ring 6 and grips the lead core L2 (see Fig. 4).
.

Next, slider 4 is operated backward. As the slider 4 moves backward, the lead core □ projects from the tip of the slider 4 against the friction of the lead core holding member 5. In this case, when retracting the slider 4, the lead core inside the slider 4 should be placed in a place where it can protrude beyond the tip of the slider 4, for example, on a drawing board that is smaller than the outer diameter of the slider and smaller than the diameter of the lead core. It is sufficient to provide a large hole (see Figure 5). When the slider 4 is returned to its original position, a gap is created between the lead core L and the lead core L2 (see FIG. 6). When the knock tube 8 is pressed again, the chuck body 7 expands, the grip on the lead core L2 is released, and the chuck body 7 falls by its own weight by the gap created by the previous operation (see FIG. 7). Next, when the knocking operation is released, centering is completed. (See Figure 8).

By repeating the above operations (FIGS. 3 to 8), the lead core L□ is discharged. Writing becomes possible when the discharge of the lead L is detected by a phototube or infrared sensor.

In addition, at this time, since the lead core L and the lead core L2 are guided by the lead guide tool 13, they do not overlap each other or bend or break.

(Effects of the Invention) The present invention has the following features: (1) A chuck body for gripping a lead core and a chuck ring for opening and closing the chuck body are disposed in a holder, and are moved forward in conjunction with the chuck body behind the chuck body; A knocking means for disengaging the chuck ring and releasing the grip on the lead core is biased rearward by a knock spring, and a slider having a lead core holding member is placed in front of the chuck body by a slider spring. Since the drawing head of the above-mentioned automatic drafting machine is biased forward and arranged by Since the slider was actuated immediately, the subsequent lead core could be reliably supplied without the need for special equipment.

[Brief explanation of the drawing]

FIG. 1 is an external view of the main parts of the drawing head when it is attached to an automatic drawing machine, and FIGS. 2 to 8 are half-sectional views of the drawing head showing the lead core feeding operation. 1...Holder, 3...Slider spring, 4
... slider, 5 ... lead core holding member, 6 ... chuck ring, 7 ... chuck body 8 ... knock pipe,
9... Knock spring work tL2... Lead core.

Claims (2)

[Claims] (1) A chuck body that grips the lead core and a chuck ring that opens and closes the chuck body are arranged in a holder,
A knock means is disposed at the rear of the chuck body in conjunction with the chuck body to disengage the chuck ring and release the grip on the lead core, and is biased rearward by a knock spring. A drawing head for an automatic drafting machine, characterized in that a slider having a lead holding member in front of the body is biased forward by a slider spring. (2) The drawing head of the automatic drafting machine according to item 1 above, characterized in that after the knocking means is activated and the chuck body is released, the knocking means is released, and then the slider is activated. Lead core supply method for automatic drafting machines.