JPH0214473Y2 - - Google Patents

Description

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

[Background technology and its problems]

In automatic writing devices such as automatic drafting machines and X-Y plotters, when a pencil lead is used as the writing means of a drawing head device serving as a writing head portion, the lead is worn out with the writing operation.

Incidentally, conventional automatic writing devices that use a pencil lead as a writing means have a structure in which only one lead can be attached to the above-mentioned drawing head device. Moreover, the above-mentioned printing head device is constructed so that only commercially available leads having a predetermined length can be attached thereto.

Therefore, each time the lead wears out and becomes impossible to write on, the lead must be attached to the printing head device one by one, and the lead must be replenished frequently.

Additionally, if the lead runs out during a writing operation and writing becomes impossible, the writing action must be interrupted and a new lead inserted into the drawing head device, which impedes smooth writing. .

[Purpose of invention]

Therefore, the present invention was proposed in view of the above circumstances, and it is possible to automatically feed a commercially available lead whose length is predetermined, and it is possible to perform a smooth writing motion without interrupting the writing motion. The purpose is to provide a new automatic writing device.

[Summary of the idea]

The present invention has been proposed to achieve the above-mentioned object, and is provided in a drawing head body that is movable in the X and Y directions on the drawing surface.
an elevating mechanism that drives the support arm up and down with respect to the printing head body; a cylindrical support member that is movably supported by the support arm; and a cylindrical support member that is slidably supported in the axial direction by the cylindrical support member. and a cylindrical lead holder member which is urged in the direction of the writing surface by interposing a writing pressure spring between the cylindrical lead holder member and the cylindrical lead holder member; The chuck holder has a chuck holder, a collet member supported through a spring inside the chuck holder, and a core chuck member that clamps and releases the core by moving the collet member relative to the chuck holder, and a plurality of cores can be stored. The cylindrical holder member is provided within the upper cylinder body thereof so as to be movable relative to the cylindrical holder member, and has a lower end abutting the upper end of the core collet member, and a core feed port provided at the lower end of the cylindrical holder member. A lead case member that communicates with the lead insertion opening of the member, and a lead case member that is provided within the lower cylinder of the cylindrical lead holder member so as to be movable relative to the cylindrical holder member and biased in the direction of the writing surface via a pressing spring. a writing block comprising a lead guide member that frictionally holds the leading end of the lead inserted therein; and a writing block that is fixed to the drawing head body and engages with the lead case member to prevent the lead case member from moving upwardly. An automatic writing device comprising a fixing member for blocking the drawing block, and a lead guide stopper fixedly arranged on the drawing head main body so as to stop the lead guide member when the writing block is lowered, wherein the lead chuck member is fixed to the writing block. When the cylindrical lead holder member rises, the collect member is pushed downward by the lead case member, thereby releasing the lead clamping action and allowing the lead inside the lead case to fall into the lead insertion hole of the collect member. In addition, when the cylindrical lead holder member is lowered, the pushing of the lead case member is released so as to clamp the lead, and the repeated movement of the lifting mechanism causes the tip of the lead to land in pressure contact with the writing surface. , and automatically feeds the plurality of leads stored in the lead case component one by one into the lead chuck component by flotation and separation, and also feeds out the leads in accordance with the wear and tear of the leads. This is a characteristic feature.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

Figure 1 shows the automatic drafting machine and X-Y
1 is a schematic cross-sectional view showing a main part of a drawing head device of an automatic writing device such as a plotter. This drawing head device is configured to be able to move to any position on the writing surface G in response to a drawing control signal or the like. In this drawing head device, a casing 4 of a lead holder member 3 constituting a writing block 2 into which a pencil lead 1 is attached is connected to a lower cylinder 4A, an intermediate cylinder 4B, and an upper cylinder by means of threaded parts 5 and 6. A first core guide cylinder 10 is supported slidably in the axial direction in the lower cylinder 4A, and a core chuck member 9 is fixedly supported in the intermediate cylinder 4B. Furthermore, a cylindrical core case member 12 capable of storing a plurality of cores 1 is slidably supported within the upper cylinder 4C.

A second core guide cylinder 13 is slidably disposed within the first core guide cylinder 10 . A pressing spring 14 is disposed between each of the lead guide cylinders 10 and 13 to apply a return force to the first lead guide cylinder 10 in the direction of the writing surface G. The second core guide cylinder 13 is pressed against the core chuck member 9 by the spring 14.

The lower end of the core case member 12 is always in contact with the upper end of the core chuck member 9, as shown in FIG. In addition, the core case member 1
The upper moving end of 2 is determined by the cap portion 20 of the upper cylinder 4C. Further, a pressing spring 16 is disposed within the upper cylinder 4C for holding the core case member 12 at its upper moving end and applying a pressing force to the core chuck member 9.

A third core guide cylinder 18 having a rubber ring 17 into which the core 1 is inserted is screwed onto the tip of the first core guide cylinder 10 that protrudes from the tip of the lower cylinder 7.

Note that the casing 4 of the core holder member 3 is attached to the threaded portions 5 and 6.
The reason why the first core 1 can be separated into the lower cylinder 4A, intermediate cylinder 4B, and upper cylinder 4C is that the first core 1 is connected to each of the core guide cylinders 1 through the core chuck member 9.
This is to make it easier to insert it smoothly into 0, 13, and 18. These cylindrical bodies 10, 13, and 18 may be integrated, and the core 1 may be inserted through the upper end opening 12a of the core case member 12. Note that the upper end opening 12
a can be closed with a cap member 20.

An outer cylinder 21 is attached to the outer periphery of the lower cylinder 7 as a cylindrical support member that supports the core holder member 3 slidably in the axial direction. This outer cylinder body 2
1 is a core pressure spring 22 made of a compression coil spring.
This acts to apply a pressing force, which is a writing pressure, to the lead holder member 3 in the axial direction toward the leading end portion of the lead through the lead holder member 3.

The writing block 2 having the above structure is held substantially perpendicular to the writing surface G by having the outer cylinder body 21 held by the support arm 24 of the elevating mechanism 23 that drives a solenoid or the like. It's becoming like that.

Note that when the outer cylinder 21 is held between the support arms 24, the upper cylinder 4 of the core case member 12
A collar member 25 fixedly supported on a portion protruding from C is received by a fixing plate 26 as a fixing member fixed to the main body of the printing head device, and the core case member 12 is held so as not to move upward. . In addition, the flange 2 formed on the third core guide cylinder 18
A lead guide stopper 28 fixed to the main body of the printing head device comes into contact with 7 to regulate the height position of the third guide cylinder 18 from the writing surface G. Further, a lead wear detection plate 30 is in contact with a flange 29 provided on, for example, the intermediate cylinder 4B of the housing 4 of the lead holder member 3, and the detection plate 30 is moved in the axial direction (vertical direction in the figure). By detecting the amount
The amount of wear on the core is detected.

As shown in FIG. 3, the core chuck member 9 is made up of a roughly cylindrical chuck holder 31 and a collet member 32 with a slightly bulged bottom end and a longitudinal groove. 33 urges the collet member 3 upward in the figure, and a ring 34 fitted into the lower end of the collet member 3
The core 1 is held in such a manner that the diameter of the bulged portion 2 is reduced. Regarding the lead gripping action of the lead chuck member 9, when an upward force is applied to the lead 1, a strong holding force is exerted, but when the lead 1 is pulled downward, a weak holding force is exerted and the lead 1 is easily pulled downwards.

Here, a description will be given of the core feeding operation when the core chuck member 9 grips the core 1 and the core 1 is inserted through the rubber ring 17 in the third core guide cylinder 18. When the core chuck member 9 and the first core guide cylinder 10 move relative to each other so as to approach each other, for example, when the core chuck member 9 moves downward in the figure (or the cylinder 10 moves upward in the figure) , since an upward force in the figure is applied to the core 1 due to the sliding friction force of the rubber ring 17, the core 1 is firmly held by the core chuck member 9, and the cylindrical body 1
Slide within 0 downward in the figure. On the other hand, when the core chuck member 9 and the cylinder 10 move relative to each other so as to be separated from each other, for example, when the core chuck member 9 moves upward in the figure (or the cylinder 10 moves downward in the figure), The holding force of the core chuck member 9 is smaller than the holding force of the core 1 due to the frictional force of the rubber ring 17, and the core 1 is held and fixed on the rubber ring 17 side, and only the core chuck member 9 moves upward.

In this way, the core chuck member 9 is moved in the axial direction (vertical direction in the figure) with respect to the first core guide cylinder 10.
Each time the lead 1 reciprocates, the lead 1 is let out from the lead chuck member 9 downward in the figure.

By the way, FIG. 1 shows a writable state (pen down state) when the amount of delivery of the lead 1 is a constant value (initial setting value). At this time, the flange 27 of the third lead guide cylinder 18 is supported by the lead guide stopper 28, so that the lead of the pencil is increased by the distance P between the tip of the third lead guide cylinder 18 and the writing surface G. will stand out. Outer cylinder body 21
is at a certain height from the writing surface G by the support arm 24 mentioned above, for example, the lower end of the outer cylinder 21 is at a height Q
The core holder member 3 is held at a position such that a pressing force is applied to the core holder member 3 via the core pressure spring 22. This pressing force is applied to the lead 1 via the lead chuck member 9, and the lower end of the lead 1 presses against the paper or the like on the writing surface G to obtain so-called writing pressure. At this time, the height R of the upper end surface of the flange 29 of the housing 4 of the lead holder member 3 is detected by the detection plate 30, and by detecting this height R, the lead chuck is substantially The distance S from the lower end of the member 9 to the writing surface G is detected.

When the writing operation is performed and the lead 1 is worn, the lead holder member 3, the lead chuck member 9, and the lead 1 are sent downward in the figure by the amount of lead wear t.
This is because the spring 22 presses the core holder member 3 downward in the figure against the outer cylinder body 21, and eventually the casing of the core holder member 3 as shown in FIG. The downward feeding operation can be performed until the lower end surface of the flange 29 of the body 4 comes into contact with the upper end surface of the outer cylinder 21 and is locked. Then, in the state shown in FIG. 4 or before reaching this state, the detection plate 30 detects that the lead wear amount t has reached a predetermined set value (for example, about 0.5 to 1.0 mm), and the writing The operation is interrupted and the pen-up operation is forced. This pen-up operation is an operation for pulling out the lead from the lead chuck member 9.

FIG. 5 shows the pen-up state, and when the writing block 2 moves from the pen-down state to the pen-up state, the housing 4 of the lead holder member 3 is lifted upward in the figure. At this time, core case member 1
2 is supported by the fixing plate 26 so as not to move upward, so only the casing 4 is lifted. Then, the collect member 23 of the lead chuck member 9 is pushed relatively downward by the lower end of the lead case member 12 due to the upward movement of the housing 4, and the lead chuck member 9 performs the clamping operation of the lead 1. Release. In this way, when the lead clamping operation of the lead chuck member 9 is released, the lead 1 housed in the lead case member 12 is released by its own weight from the lead feeding port 12b formed at the lower end of the case member 12. It descends into the core insertion hole 31a of the chuck member 9.

Therefore, by repeatedly performing the pen up and down operations of the writing block 2, the lead 1 is pulled out downward within the lead holder member 3, and the lead 1 inside the lead case member 12 is automatically moved into the lead holder member 3. can be supplied to In addition, each core guide cylinder 10, 13, 1 passes through the core chuck member 9.
The core 1 located within the core 8 is pushed out while being pressed by the core 1 fed into the core chuck member 9.

In this way, according to the above embodiment, commercially available leads with predetermined lengths can be automatically fed into the lead holder member 3 one by one without being interrupted, so that the lead 1 can be easily supplied during the writing operation. Accidents such as lead 1 running out can be prevented as much as possible, smooth writing operation can be performed for a long time, and the number of times the lead 1 needs to be replenished can be reduced. Therefore, it is highly effective for devices that automatically perform drafting work, such as automatic drafting machines.

Furthermore, according to the above embodiment, the writing block 2
The amount of lead wear t when drawing with a single stroke while the lead tip is in pressure contact with the writing surface G is because the feeding operation of lead 1 is automatically performed in conjunction with the landing and floating movements of the lead tip, so-called pen-down and pen-up movements. The core 1 is not forcibly fed out unless it exceeds the above-mentioned certain value (for example, about 0.5 to 1 mm).

In addition, if the amount of lead wear when drawing with one stroke exceeds the above-mentioned certain value, the change in the height position of the lead holder member 3 from the writing surface G of the housing 4 is detected by the detection plate 3.
The writing block 2 is detected by a position detecting means, such as a photo interrupter, provided in connection with the writing block 2, and in response to this detection output, the writing operation is temporarily stopped and the lifting mechanism 23 is activated to move the writing block 2 up and down. As a result, the lead 1 is forcibly fed out. After this lead feeding operation is completed, the temporarily stopped writing operation may be continued. In this case, it should be noted that the detection of lead wear is carried out regularly during the writing operation, and there is no need to interrupt the writing action just to detect this lead wear. In addition, since the wear condition of the lead 1 is detected by the amount of height position movement of the lead holder member 3, the amount of lead wear can be checked with a simple structure, and the amount of displacement of the lead holder member 3 can be continuously detected even during writing operation. Therefore, there is no need to interrupt the writing operation just to check for lead wear.

Furthermore, at the start of a writing operation, etc., even if the pen is down, the lead holder member 3 reaches a lowered position with respect to the outer cylinder 21 (for example, see FIG. 4), and the detection plate 30 detects lead wear. , the pen up and down operations may be repeated several times to perform the lead feeding operation, and when a predetermined amount of lead feeding is reached, the writing operation may be performed. In this case, even if the pen up and down operations are performed a predetermined number of times (for example, about 5 to 6 times), if the predetermined amount of lead delivery is not reached, an alarm may be issued to request replacement of the lead.

[Effect of idea]

As described above, according to the present invention, commercially available leads with predetermined lengths can be automatically fed into the lead holder member one by one by the lifting and lowering movement of the writing block, so that the leads can be easily supplied during the writing operation. Accidents such as lead loss can be prevented as much as possible, smooth writing operations can be performed over a long period of time, and the number of times the lead needs to be replenished can be reduced. Therefore, it is highly effective for devices that automatically perform drafting work, such as automatic drafting machines.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing the main parts of a drawing head device of an automatic writing device showing one embodiment of the present invention;
The figure is a schematic sectional view of the vicinity of the lead holder member, FIG. 3 is a schematic enlarged sectional view of the lead chuck member, and FIGS.
The figures are schematic sectional views showing different operating states of the writing block. DESCRIPTION OF SYMBOLS 1...Lead, 2...Writing block, 3...Lead holder member, 9...Lead chuck member, 12...Lead case member, 12b...Lead feeding port, 21...Outer cylinder body, 23...Elevating/lowering Mechanism, 24...Support arm, 2
6... Fixed plate, 31a... Core insertion hole.

Claims (1)

[Scope of Claim for Utility Model Registration] An elevating mechanism provided on a printing head body that is movable in the X and Y directions on the drawing surface and that drives a support arm up and down with respect to the printing head main body; and a cylindrical support member that is slidably supported in the axial direction by the cylindrical support member, and a writing pressure spring is interposed between the cylindrical support member and the cylindrical support member that is applied in the direction of the writing surface. The chuck holder includes a biased cylindrical lead holder member, a chuck holder integrally provided within the intermediate cylinder of the cylindrical lead holder member, and a collet member supported within the chuck holder via a spring, and A core chuck member that clamps and releases the core by relative movement of the collet member, and a plurality of cores can be stored in the upper cylinder of the cylindrical holder member, and are movable relative to the cylindrical holder member. a lead case member whose lower end abuts the upper end of the lead collector member and whose lead feed port provided at the lower end communicates with the lead insertion port of the lead collector member; A writing block comprising a lead guide member that is movable relative to the cylindrical holder member, is biased in the direction of the writing surface via a pressure spring, and frictionally holds the leading end of the inserted lead; a fixing member that is fixedly disposed on the drawing head main body and engages with the lead case member to prevent the lead case member from moving upward; a drawing head that locks the lead guide member when the writing block is lowered; An automatic writing device comprising a lead guide stopper fixedly arranged on the main body, wherein the lead chuck member is such that when the cylindrical lead holder member is raised, the collector member is pushed downward by the lead case member. As a result, the clamping operation of the lead is released and the lead in the lead case part can fall into the lead insertion hole of the collect member, and when the cylindrical lead holder member is lowered, the pushing of the lead case member is released. By this, the above-mentioned lead is held between the leads, and the plurality of leads housed in the above-mentioned lead case parts are held one by one by the landing pressure contact of the tip of the lead against the writing surface by the repeated operation of the above-mentioned elevating mechanism, and by floating and separating. An automatic writing device characterized in that the lead is automatically fed into the chuck member and the lead is fed out according to wear of the lead.