JPH0327836Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic drawing device such as an X-Y plotter, and more particularly to an automatic drawing device that uses a pencil lead as a writing means.

[Conventional technology]

The Toba X-Y plotter is an automatic drawing device.
A writing instrument is attached to a writing head that moves in any direction on the drawing surface, and any figure can be drawn on the drawing surface using this writing instrument.

By the way, as this writing instrument, a so-called sharp pencil type writing instrument is used, which uses a pencil lead as a writing means.

FIG. 6 shows a sectional view of a conventionally known sharp pencil type writing instrument.

Referring to FIG. 6, the chuck mechanism 45 for gripping the pencil lead will be described. A chuck member 31 having a slightly bulged lower end and a groove in the vertical direction is disposed in a roughly cylindrical chuck holder 30. The lead chuck member 31 is urged upward by a coil spring 32, and the diameter of the bulge is reduced by a ring 33 fitted into the lower end, thereby gripping the pencil lead 34.

Further, FIG. 7 shows the lead chuck member 31 taken out, and the inner circumferential surface of the lower end of the bulged portion 35 has an unevenness 36 for holding the pencil lead 34 in its mouth.
is formed. Further, the bulging portion 35 is in an open state when no force is applied.

The lead gripping action of the chuck mechanism 45 has a strong holding force when an upward force is applied to the pencil lead 34, and a weak holding force when a downward force is applied to the pencil lead 34. The pencil lead 34 is sent out downward.

By the way, in the writing instrument having the chuck mechanism 45, the outer cylindrical body 37 of the writing instrument is held by a holding arm 38 of a writing head of an X-Y plotter, and this holding arm 38 is a solenoid provided in the writing head. By moving up and down with the plunger, it is driven up and down relative to the drawing surface 39. Further, when the writing instrument is lowered, the collar portion 42 of the lead guide 41 of the writing instrument is locked by the stopper 40 of the writing head, and drawing is performed in this state. Further, when the writing instrument is raised, the pencil lead 34 is held by the rubber ring 43 in the lead guide 41, so that the lead chuck member 31 that grips the pencil lead 34 is moved by the return force of the coil spring 44. When the pencil lead 34 is pulled downward, the bulging portion 35 opens and the holding force weakens, allowing the pencil lead 34 to be drawn out.

In this way, in the writing instrument having the chuck mechanism 45, the lead chuck member 31 opens and closes every time the writing instrument moves from the lowered state to the raised state, and the pencil lead 34 is automatically fed out.

By the way, when the pencil lead 34 is fed out, the pencil lead 34 is re-bitten by the unevenness 36 provided on the bulge 35 of the lead chuck member 31 which opens and closes.

This re-biting involves re-biting between the unevenness formed on the pencil lead 34 by the above-mentioned unevenness 36.
Since this is done to further form irregularities on the pencil lead 34, if the writing instrument is raised repeatedly when drawing lines such as broken lines, the pencil lead 34 may be scraped and become thinner, making it impossible to write. This makes continuous writing impossible.

[Problem that the invention attempts to solve]

As described above, in conventional automatic drawing devices, the sharp pencil type writing instrument attached to the writing head has a small amount of wear on the pencil lead, which causes chattering failures when writing dashed lines, dotted lines, kanji characters, etc., which require many lifting and lowering of the writing instrument. There was a problem with not being able to write continuously.

Therefore, the present invention was proposed to solve these conventional problems, and even if the writing instrument is raised and lowered many times, the pencil lead will not cause chattering defects and will continue to draw broken lines, dotted lines, kanji, etc. The purpose of the present invention is to provide an automatic drawing device that can be used to draw notes.

[Means for solving problems]

In order to achieve this purpose, the present invention has a lead gripping structure in which unevenness is formed to grip the pencil lead, and when an upward force is applied to the pencil lead, a strong holding force is obtained, and when a downward force is applied, a weak holding force is obtained. A writing instrument equipped with a chuck mechanism that operates and a lead guide that is slidably provided below the chuck mechanism and biased in the direction of the drawing surface and holds the pencil lead by frictional force is raised and lowered with respect to the drawing surface. When the writing instrument is lowered, the pencil lead and lead guide come into contact with the drawing surface, and the chuck mechanism grips the pencil lead. In this state, drawing is performed, and when the writing instrument is raised, the pencil lead is brought into contact with the drawing surface. The lead guide is extended in the drawing direction relative to the chuck mechanism by a predetermined amount corresponding to the sliding of the lead guide due to wear, and the pencil lead held by the lead guide is pushed against the weak holding force of the chuck mechanism. In an automatic drawing machine configured to feed out a pencil lead, a stepped part for feeding out a pencil lead is formed on the drawing surface by a predetermined amount below the contact surface of the lead guide, and the pencil lead contact surface is formed on the drawing surface.
When drawing wavy lines, dotted lines, kanji characters, etc., where the amount of consumption of the pencil lead is small and the writing instrument is raised and lowered many times, the writing instrument is raised and lowered at the stepped portion, and the pencil lead is kept in a state where it protrudes by the specified amount from the lower end surface of the lead guide. It is characterized by being drawn out.

[Effect]

Therefore, according to the present invention, it is possible to feed out a certain amount of the pencil lead of a writing instrument using the step on the drawing board, and the pencil lead cannot be fed out until after this certain amount of pencil lead has been consumed. By that,
It is possible to continuously write broken lines, dotted lines, kanji, etc. without causing a tracking problem.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a plan view of an automatic plotting apparatus which is an embodiment of the present invention, and shows an X-Y plotter.

In FIG. 1, fixed rails 2 and 3 are arranged parallel to each other on both upper and lower edges of a drawing board 1, and along these fixed rails 2 and 3, the left and right directions (X
A moving rail 4 is disposed so as to be movable in the direction). A writing head 5 is disposed on the movable rail 4 so as to be movable in the vertical direction (Y direction) in the figure, and a writing instrument 6 of, for example, a sharp pencil type is attached to the writing head 5. Therefore, any figure can be drawn on the drawing surface 1A of the drawing board 1 by the writing instrument 6 attached to the writing head that can move in any direction (X direction and Y direction in the figure) on the drawing surface 1A. etc. can be drawn.

Further, a stand member 7 for holding a spare writing instrument 6 is provided near one side edge (left side edge in the figure) of the drawing board 1. This stand member 7 is located within the range of movement of the writing head 5. Further, the stand member 7 has a core diameter of, for example, 0.3
It has a holder part 8 for holding a plurality of writing instruments 6 loaded with pencil leads of mm, 0.5 mm, 0.7 mm, etc. in alignment along the side edge of the drawing board 1. The spare writing instrument 6 held by the stand member 7 is automatically replaced by the writing head 5 that has moved to this position.

Incidentally, on the drawing surface 1A, for example, a small hole 9, which serves as a stepped portion, is bored at an end position that is within the movement range of the writing head 5 and does not interfere with normal drawing. In this embodiment, the stand member 7 is provided at a lower position. FIG. 2 shows a sectional view of the small hole 9, and in this embodiment, the small hole 9 has a diameter a of, for example, 2 mm and a depth b.
is, for example, 0.5mm.

This small hole 9 is used to feed out a certain amount of the pencil lead loaded into the writing instrument 6, and the writing head 5 moves to the position of this small hole 9, and the pencil lead of the writing instrument 6 is fitted into the small hole 9. By performing the so-called pen-down and pen-up operations in this manner, the pencil lead is drawn out by a certain amount b corresponding to the depth b. Here, the diameter a of the small hole 9 is set to a size such that each pencil lead having a different lead diameter can be easily fitted into the small hole 9.

Next, an example of the so-called sharp pencil type writing instrument 6 to be attached to the writing head 5 will be described with reference to FIGS. 3 and 4.

In FIG. 3, a lead holder portion 12 that is slidable in the axial direction is provided inside the outer cylinder 11 that is held by the holding arms 10 of the writing head 5.
A coil spring 13 for applying core pressure is disposed between the outer cylinder 11 and the core holder portion 12. Further, a lead guide 14 that is slidable in the axial direction is provided at the tip of the lead holder portion 12, and a rubber ring 15 for holding a pencil lead is fitted into the lead guide 1.

In addition, inside the cylindrical body 16 of the core holder part 12,
A chuck mechanism 17 is provided.

To explain this chuck mechanism 17, a core chuck member 19 is disposed in a roughly cylindrical chuck holder 18.
The core chuck member 19 is urged upward by a coil spring 20 interposed between the chuck holder 18 and the core chuck member 19.

FIG. 4 shows the core chuck member 19 taken out. This lead chuck member 19 is a flat cylindrical body having a groove 21 running vertically from the tip side, and an unevenness 24 for holding a pencil lead 23 is formed on the inner peripheral surface of the tip part 22. . Further, a groove 25 having an arcuate cross section is formed on the outer peripheral surface of the tip portion 22 . By the way, the inner surface of the lower end of the chuck holder 18 is a conical tapered guide surface 26.
A ball 27, which is a rolling element, is interposed between the groove 25 of the tip 22 and the groove 25 of the tip 22.

In addition, the chuck holder 18 and the core guide 14
A coil spring 28 for returning the core guide 14 is arranged between the core guide 14 and the core guide 14 to apply a downward pressing force to the core guide 14.

In this way, the lead gripping action of the chuck mechanism 17 is as follows:
When an upward force is applied to the pencil lead 23, a strong holding force is obtained, and when a downward force is applied, a weak holding force is obtained, allowing the pencil lead 23 to be drawn out.

By the way, in the writing instrument 6 equipped with the chuck mechanism 17, the clamping arm 10 is attached to the writing head 5.
By moving up and down by a solenoid plunger provided in the drawing plane 1A, the drawing plane 1A is moved up and down. Further, when the writing instrument 6 is lowered onto the drawing surface 1A and writing is being performed, the lead guide 14
The lower end surface of the drawing surface 1A is in contact with the drawing surface 1A, and an appropriate core pressure is applied by the coil spring 13. In this state, an upward force is applied to the pencil lead 23 by the coil spring 20 that urges the lead chuck member 19 upward and the lead pressure, and the tip portion 22 of the lead chuck member 19 The pencil lead 23 is firmly held by the gripper.

Furthermore, when the writing instrument 6 rises, the rubber ring 15 inside the lead guide 14 moves the pencil lead 2 upward.
3 is held, the lead chuck member 19 that grips the pencil lead 23 is pulled downward by the restoring force of the coil spring 28, and the gripping force of the tip 22 weakens, causing the pencil lead 23 to be drawn out. will be carried out.

By the way, a detection plate 29 is in contact with the upper end of the lead holder part 12 to measure the wear amount of the pencil lead 23, and by detecting the amount of vertical movement of the detection plate 29 with a photo interrupter or the like, the amount of consumption of the pencil lead 23 is detected. The amount of consumption is detected. The detected amount of wear of the pencil lead 23 is the amount of wear of the writing instrument 6.
The number of times the writing instrument 6 is raised and lowered is calculated as the number of times the writing instrument 6 is raised and lowered, even though the amount of consumption of the pencil lead 23 is small.

When such predetermined conditions are detected, the writing head 5 is moved to the position of the small hole 9,
A so-called pen-down operation of the writing instrument 6 is performed at a position above the small hole 9. At this time, the lower end surface of the core guide 14 comes into contact with the drawing surface 1A, and the coil spring 1
The lead pressure of step 3 pushes the lead guide 14 upward against the coil spring 28, and the pencil lead 23 comes to be fitted into the small hole 9. Fifth
This pen-down state is shown in the figure. When a so-called pen-up operation of the writing instrument 6 is performed in this state, the pencil lead 23 is fed out with the pencil lead 23 protruding from the lower end surface of the lead guide 14 by a certain amount b corresponding to the depth b. .

After the pencil lead 23 is fed out by a certain amount b in this way, the pencil lead 23 of this certain amount b
If the core guide 14 is not worn out when writing,
The lower end surface of does not come into contact with the drawing surface 1A. Therefore, during this period, even if the writing instrument 6 is raised and lowered many times, the coil spring 28 continues to bias the lead guide 14 downward, and the tip 22 of the lead chuck member 19 is not opened or closed. Since the pencil lead 23 is not fed out, it is possible to prevent chuck defects caused by repeated re-biting of the pencil lead 23.

In this way, the automatic drawing device described above detects when writing broken lines, dotted lines, kanji characters, etc., when the amount of consumption of the pencil lead 23 is small and the number of times the writing instrument 6 is raised and lowered is large, and the pencil lead 23 is fed out by a certain amount. Therefore, chucking defects are prevented and broken lines, dotted lines,
It becomes possible to write down kanji etc. continuously.

Note that if the amount of consumption of the pencil lead 23 is greater than the number of times the writing instrument 6 is raised and lowered, the pencil lead 23 is not fed out by the above-mentioned fixed amount.

Further, the sharp pencil type writing instrument used in the automatic drawing device is not limited to the writing instrument 6 shown in FIG. 3, but may be the writing instrument shown in FIG. 6.

Further, the position of the small hole 9 is not limited to the position of this embodiment.

Moreover, instead of forming the small hole 9 as a step, a square hole may be formed, or a groove-like step may be formed.

[Effect of idea]

As explained above, according to the present invention, when writing on broken lines, etc., where the amount of consumption of the pencil lead is small and the writing instrument is raised and lowered many times, the pencil can be drawn using a small hole, which is a step formed on the drawing surface. The core is fed out a certain amount. Therefore, the pencil lead will not be fed out even if the writing instrument is moved up and down until a certain amount of the drawn out pencil lead has been consumed, so it will not become impossible to check and will continue to draw broken lines, dotted lines, kanji, etc. can be written down.

[Brief explanation of drawings]

Fig. 1 is a plan view of an automatic drawing device that is an embodiment of the present invention, Fig. 2 is a cross-sectional view of a small hole to be drilled on the drawing surface of the automatic drawing device, and Fig. 3 is a plan view of an automatic drawing device that is an embodiment of the invention. 4 is a sectional view of the lead chuck member of the writing instrument used; FIG. 5 is a side view showing how the writing instrument draws out the pencil lead using the small hole; FIG. 6 is a sectional view of a sharp pencil type writing instrument for explaining a conventional automatic drawing device, and FIG. 7 is a sectional view of a lead chuck member of the writing instrument shown in FIG. 1A... drawing drawing, 2, 3... fixed rail, 4... movable rail, 5... writing head, 6... writing instrument, 9... small hole, 10... clamping arm, 11... outer cylinder, 12... lead holder part, 13, 20, 28...Coil spring, 14...Core guide, 15...Rubber ring, 17...
chuck mechanism, 18... chuck holder, 19... core chuck member, 27... ball, 29... detection plate.

Claims (1)

[Claim for Utility Model Registration] The unevenness that grips the pencil lead is formed, and when an upward force is applied to the pencil lead, it becomes a strong holding force.
a chuck mechanism that performs a core gripping action that produces a weak holding force when a downward force is applied;
A writing instrument equipped with a lead guide that holds the pencil lead by frictional force is driven up and down with respect to the drawing surface, and as the writing instrument is lowered, the pencil lead and the lead guide come into contact with the drawing surface, and the chuck mechanism causes the pencil lead to be moved up and down. Grasping is performed, and drawing is performed in this state, and by raising the writing instrument, the lead guide is moved in the drawing direction with respect to the chuck mechanism by a predetermined amount corresponding to the sliding of the lead guide as the pencil lead wears out. In an automatic drawing machine that allows the pencil lead held in the lead guide to come out against the weak holding force of the chuck mechanism, the contact surface of the pencil lead is placed a certain amount below the contact surface of the lead guide. A step part for feeding out the lead is formed on the drawing surface, and the amount of consumption of the pencil lead is small, and when drawing wavy lines, dotted lines, kanji, etc., where the writing instrument is raised and lowered many times, the writing instrument is raised and lowered at the step part, and the pencil lead is raised and lowered. An automatic drawing device characterized in that the lead is fed out in a state in which the lead protrudes from the lower end surface of the lead guide by the predetermined amount.