JPH03277599A - Method for detecting presence of lead in automatic lead supply apparatus for automatic drawing machine - Google Patents

Abstract

PURPOSE:To prevent erroneous operation such that a unit holder moves a lead supply operation position in a pencil holder absent state by confirming the pencil holder absent state beforehand when the unit holder goes to a writing utensil stocker for the pencil holder. CONSTITUTION:When a pen presence detecting order is issued, a controller rotates a writing utensil stocker 16 and moves a writing utensil holding means 30 to the front of a sensor 176. The sensor 176 detects whether the writing utensil holding means 30 is holding a pencil holder 12 to input a detection signal to the controller. The controller writes the signal showing the presence of the pencil holder 12 in a memory at the No. position corresponding to the writing utensil holding means 30 of the writing utensil stocker 16 of the table in the memory and rotates the stocker 16 when a lead supply order is issued to oppose the writing utensil holding means 30 to a unit holder 66 and moves the unit holder 66 to the writing utensil stocker 16 and a writing utensil holding means 68 grasps the pencil holder 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting the presence or absence of a pen in an automatic drawing machine.

[Conventional technology]

In Japanese Patent Application Laid-Open No. 2-29399, a sliding member picks up a pencil holder held by a writing instrument stocker, moves the pencil holder taken from the writing instrument stocker to a lead supply/discharge position, An automatic core feed/discharge device for an automatic drafting machine that feeds/discharges a core to a pencil holder held by a pencil holder is disclosed.

[Problem that the invention seeks to solve]

In the above configuration, there is no sensor configuration for detecting the presence or absence of a pencil holder on the sliding member.

Therefore, when the sliding member goes to pick up the pencil holder from the empty writing instrument holding means of the writing instrument stocker, the sliding member moves to the lead supply/discharge position without holding the pencil holder, and there There was a defect that a wandering core operation was performed.

The present invention aims to eliminate the above-mentioned defects.

[Means to solve problems]

In order to achieve the above object, the present invention provides a pencil holder 1.
A writing instrument stocker 16 is rotatably disposed on the body side of an automatic drawing machine, and has a plurality of writing instrument holding means 30 for detachably holding writing instruments 2. The unit holder 66 is provided with a unit holder 66, and a lead pushing means for pushing the long lead in the pencil holder 12 held by the writing instrument holding means 68 of the unit holder 66 to a predetermined position is provided. In the automatic core supply device for an automatic drafting machine, the pencil holder 12 can be automatically exchanged mutually between the line head and between the unit holder 66 and the writing instrument stocker 16. A pen holder presence/absence ratio sensor 176 is arranged to face each other, and this sensor 176 detects whether or not each writing instrument holding means 30 of the writing instrument stocker 16 is holding the pencil holder 12. From this detection result, it is determined that the unit holder 66 is This prevents the pencil holder 12 from being retrieved from the writing instrument holding means 30 of the writing instrument stocker 16 when it is empty.

〔Example〕

The structure of the present invention will be explained in detail below with reference to the embodiments shown in the attached drawings. In FIG. 4 is fixed. A Y rail (not shown) is installed above the platen 4 horizontally thereto, and a printing head 6 is movably attached to the Y rail. The drawing head 6 is
The belt pulleys at both ends of the Y-rail are connected to an endless steel belt 8. This steel belt 8 is configured to be driven by a Y motor (not shown) linked to the belt pulley. The paper on the platen 4 is supported by a pinch roller mechanism consisting of a drive roller and a presser roller arranged on both sides of the platen 4, and the paper on the platen 4 is rotated by the rotation of the drive roller driven by the X motor. Sent in the X direction. The drawing head 6 is provided with a known writing instrument holding means 10 in conjunction with a built-in pen lifting mechanism, and the holding means 10 can detachably hold a known knock-type pencil holder 12. It is configured as follows. A box-shaped base 14 equipped with a core feeding mechanism is fixed to the body 2, and a rotary writing instrument stocker 16 is mounted on the base 14 at a moving end of the printing head 6 along the Y rail. (carrousel) is installed. a lower board 20 fixed to the support shaft 18 of the stocker 16;
is removably connected to a board 24 (see FIG. 8), and the board 24 is connected to a motor 2 with a speed reducer fixed to the base 14.
It is fixed to the power shaft of 2. The aspect of the lower board 20 is as shown in FIG.

A U identification mark 26 is provided, and the mark 26 is read by a stocker sensor 28 disposed on the base 14, so that the controller can recognize the rotational origin position of the writing instrument stocker 16 and the presence or absence of the stocker 16. It is composed of The stocker 16 removably connects the stocker 20 to the board 24 by fitting a pair of pins protruding from the board 24 into pin holes drilled in the bottom of the lower board 20. It is configured to obtain. The motor 22 is connected to a controller consisting of a microcomputer via a driver. Writing instrument holding means 30 are formed at regular intervals on the pair of discs of the stocker 16, and a known knock-type pencil holder 12, which will be described later, is removably held in each holding means 30. The pencil holder 12 is configured to be automatically exchangeable between a desired one of the writing instrument holding means 30 and the writing instrument holding means 10 of the drawing head 6. The structure of automatic exchange of writing instruments between the drawing head 6 and the stocker 16 is well known and is not the gist of the present invention.
A detailed explanation thereof will be omitted.

Next, the structure of the knock-type pencil holder 12 will be explained with reference to FIG. 18.

34 is a knock mechanism, 36 is a lead chuck mechanism, 38 is a pencil lead displacement mechanism, and 40 is a case.

The knock mechanism 34 has a lead passage 4 that holds one pencil lead 42.
4, and a knock spring 46 for coupling with a core chuck mechanism 36, which will be described later.

The core chuck mechanism 36 includes a chuck member 48 with a split end, a ball 5o attached to the chuck member 48, a chuck case 52, and two chuck springs 54.
It has 56. Here, 58 is a shock absorbing spring.

The pencil lead displacement mechanism 38 is formed at the tip of the pencil holder 12, and a rubber ring 60 is provided at a predetermined position to hold the pencil lead with an appropriate frictional force.

The inner case 62 connects the lead chuck mechanism 36 to the pencil holder 1.
2 and the pencil lead displacement mechanism 3.
Lock 8. The pencil lead displacement mechanism 38 is supported so as to be slidable up and down, and is coupled by a coupling spring 64.

Next, the action will be explained.

One pencil lead 42a held in the lead passage 44 is taken into the three passages by a funnel-shaped member 66 formed at the top of the lead chuck mechanism 36. This taken-in pencil lead 42a is herein referred to as a first pencil lead 42a. here,
The first pencil lead 42a is gripped by the chuck member 48 of the lead chuck mechanism 36 by moving the knock mechanism 34 up and down one or more times, that is, by opening and gripping the chuck member 48. At this time, the first pencil lead 42a
Generally, the tip of the rubber ring 60 of the pencil lead displacement mechanism 38
is in contact with. In this state, by moving the pencil lead displacement mechanism 38 up and down, the first pencil lead 42a is gradually drawn out. To explain this in more detail, the chuck mechanism of this pencil holder has a relatively weak holding force in the direction of feeding out the pencil lead when the pencil lead is being gripped.

Further, it is configured to have an extremely strong holding force in the direction of pushing back the pencil lead. Therefore, the pencil lead displacement machine $
When the pencil lead 38 moves upward, the first pencil lead 42a
Since it is held by the chuck member 48, the first pencil lead 4
2a is not displaced, and therefore the pencil lead displacement mechanism 38 changes position relative to the first pencil lead 42a. When the pencil lead displacement mechanism 38 returns to its original position from this state, the rubber ring 38
The first pencil lead 42a is pulled out by the amount of its vertical stroke due to the frictional force.

When the first pencil lead 42a comes out from the tip of the pencil holder 12, recording can be performed. The first pencil lead 42a is worn out in response to recording, and as shown in FIG. 18, when the rear end comes off the lead chuck mechanism 36, recording can no longer be performed. In such a case, this first pencil lead 42a
, that is, the remaining core must be removed.

The lead chuck mechanism 36 of the pencil holder in this reference example has a structure in which the gripping and releasing operation is performed in a fixed position in order to maintain good recording quality, so it does not itself have the effect of feeding the pencil lead. . Therefore, even if the first pencil lead 42a wears out and comes off the lead chuck mechanism 36, and the second pencil lead 42b follows and operates the knock mechanism 34 while being gripped by the lead chuck mechanism 36, the first pencil lead 42
a cannot be removed. Here, the first pencil lead 4
2a is supported by a rubber ring 6o of a pencil lead displacement mechanism 38 with a predetermined frictional force.

Now, the first pencil lead 42a and the second pencil lead 42b are in the 18th
In the state shown in the figure, the first pencil lead 42a has come off the lead chuck mechanism 36, and the second pencil lead 42b has left the first pencil lead 4.
Suppose that it is in contact with the rear end of 2a. Here, the pencil lead displacement mechanism 38 is pushed up by a predetermined amount against the coupling spring 64. As the pencil lead displacement mechanism 38 rises, the first pencil lead 42a supported by the frictional force of the rubber ring 60 also tries to rise by a predetermined amount, but the second pencil lead in contact with the rear end of the first pencil lead 42a Since the pencil lead 42b is held by the lead chuck mechanism 36, the first pencil lead 42a does not rise and remains in that position. Therefore, the first pencil lead 42a advances relative to the pencil lead displacement mechanism 38. If the pencil lead displacement mechanism 38 is returned to its original position at this point, a predetermined amount of space (the amount of rise of the pencil lead displacement mechanism 38) will be created between the rear end of the first pencil lead 42a and the second pencil lead 42b. The knocking mechanism 34 is pushed down in this state where this occurs. Core chuck mechanism 36
is opened and the second pencil lead 42b falls due to gravity and the first
It is in contact with the rear end of the pencil lead 42a. The first pencil lead 42a can be removed by performing these two operations one after another, that is, the upward movement of the pencil lead displacement mechanism 38 and the downward movement of the knocking mechanism 34.

Next, the core feeding mechanism will be explained.

Reference numeral 66 denotes a unit holder, and a writing instrument holding means 68 having substantially the same structure as the writing instrument holding means 10 of the drawing head 6 is provided on the front surface of the unit holder. The unit holder 66 has a guide shaft 70.7 fixed to the upper wall of the base 14.
It is slidably attached to 2. Said base 1
4 includes pulleys 7 located near both ends of the guide shaft 70.
4 and 76 are rotatably supported, and one pulley 76 is
It is connected to the output shaft of the motor 78. The pulley 74.
An endless timing belt 80 is passed through the belt 76 with an appropriate tension, and the unit holder 66 is connected to the belt 80.

Reference numeral 82 designates a core supply tank stocker, the lower disk 84 of which is rotatably supported on the upper wall of a box 86 erected on the base 14 (see FIGS. 8 and 12).
It is removably connected to the

A recognition mark 90 is provided on the surface of the disk 84 as shown in FIG. 8
2 and the presence or absence of the core supply tank stocker 82 can be recognized. The core supply tank stocker 82 is constructed by fitting pin holes 94, 96 (see FIG. 12) formed in the bottom of the lower disk 84 to pins 98, 100 protruding from the disk body 88. , the core tank stocker 82 is configured to be removably connected to the board 88. Said board 8
A gear 102 is formed at the box 86, and the gear 102 connects to the motor 10 fixedly attached to the box 86 via a gear transmission mechanism.
It is linked to the output shaft of 4. The stocker 82 holds a plurality of core tanks 106 between disks 81 and 84.

As shown in FIG. 12, the lead tank 106 is formed with a lead storage section 110 for storing a plurality of writing leads 108. A hole is formed at the bottom of the core storage section 110, and a pipe-shaped core guide 112 is slidably inserted into the hole. The core guide 112 is connected to the core storage section 110.
It is located at the center of the tapered surface formed on the bottom of the guide. The lower surface of the flange formed on the core guide 112 comes into elastic contact with the upper surface of the disc 84 due to the elastic force of the compression coil spring 114, and in this elastic contact state, the core guide 11
The lower part of the core guide 112 protrudes a predetermined amount from the lower surface of the disc 1 84, and the upper end of the core guide 112 is set at the same height as the tapered bottom surface of the core storage section 110, as shown in FIG. The core tank 10 is provided on the lower surface of the disc 84.
6, a shutter plate 116 is supported so as to be slidable in the radial direction of the disk 84. The shutter plate 1
16, as shown in FIG. 12, a recessed portion 118 having a horizontal bottom and an inclined surface is formed. A protrusion 120 is formed downward at one end of the shutter plate 116;
A shutter hole 122 is provided in the vicinity of one end thereof. The shutter plate 116 is biased toward the outer circumference of the disc 84 and is locked by a stopper provided on the disc 84. A writing instrument holding means 68 of the unit holder 66 is located directly below the arrangement circle of each lead tank 106.

An arm rotating shaft 124 is rotatably supported on the upper wall of the base 14, and the rotating shaft 124 is connected to an output shaft of a motor 126 fixedly installed within the base 14. An arm 128 is fixed perpendicularly to the upper end of the arm rotation shaft 124, and a pin 130 protruding from the upper surface of the arm 128 is attached to the lower part of the lead tank 106 located directly above the writing instrument holding means 68. It faces the shutter plate 116.

The shutter plate 116 and the arm 128 constitute a shutter mechanism for dropping one lead 108 from the lead tank 106. In addition, this shutter mechanism is
Since various configurations are possible, the present invention is not particularly limited to the illustrated configuration. Reference numeral 132 designates an upper knock plate which is rotatably supported on the upper part of the unit holder 66 about an axis parallel to the upper wall of the base 14 and perpendicular to the guide shaft 70. Two prongs are formed into which the mechanism 34 is received. The knock plate 132 is biased in the upward direction with its forked portions, and a portion of the rear stopper is locked to the bracket of the unit holder 66 in a substantially horizontal position. As shown in FIG. 3, a roller 136 is rotatably supported on the knock plate 132. As shown in FIG. A push-down plate 148 on which protrusions 140a, ], 40b are formed is fixed to the upper wall of the box 86, located on the movement path of the roller 136 along the guide shaft 70°72. There is.

As shown in FIG. 3, the bracket fixed to the upper wall of the base 14 has a guide shaft 7 parallel to the upper wall.
The lower knock plate 142 is centered on the axis perpendicular to 0.72.
is rotatably supported on a shaft 146. The knock plate 14
2 is formed with a bifurcated portion that receives the small diameter portion 38a of the pencil lead displacement mechanism 38 of the pencil holder 12. The knock plate 142 is biased in a downward direction with its forked portions, and in a substantially horizontal position, the lower surface of the knock plate 142 is in elastic contact with the stopper surface of the bracket.

A roller 144 is rotatably supported at one end of the knock plate 142, located in a movement path of a tapered portion 148 (see FIG. 12) at the bottom of the unit holder 66. A residual lead discharge hole 150 (see FIG. 4) is formed in the upper wall of the base 14, located below the movement path of the writing instrument holding means 68 of the unit holder 66 along the guide shaft 70, 72. Reference numeral 6152 denotes a sensor mounting plate (see FIGS. 12 and 14) that is movably disposed above the residual core discharge hole 150 along a slide guide member 154 fixed to the base 14. , a residual core detection sensor 156 is located at one rising portion of the residual core discharge hole 150.
It is installed directly above the The other pair of rising portions 152a and 152b of the sensor mounting plate 152
are rollers 158 and 160 rotatably supported by the lower bracket of the unit holder 66 (see FIG. 15).
is in elastic contact with the spring 162 due to the tensile force of the spring 162.

Next, the core protrusion amount adjustment mechanism will be explained.

In FIG. 4, 162 is an 8 adjustment plate, and the base 1
Shafts 164 and 166 are supported on brackets 4 and 4 to be rotatable about axes that are horizontal to the upper wall of the base 14 and perpendicular to the guide shafts 70 and 72. A recessed portion is formed in the eight adjusting plate 162, and the recessed portion is located directly below the movement path of the writing instrument holding means 68 along the guide shaft 70.72. The 8 adjustment plate 162 is
A portion of the stopper 162a is biased in a direction to come into elastic contact with the upper wall of the base 14. The rollers 158, 1 of the unit holder 66 are provided on both sides of the 8 adjusting plate 162.
Rollers 168 and 170 are rotatably supported on the moving path of the roller 60.

A remaining core discharge hole 174 is provided in the upper wall of the base 14, located below the core folded edge 172 of the recessed portion. In FIG. 3, reference numeral 176 denotes a pencil boulder presence/absence detection sensor, which is disposed opposite to the rotation path of the writing instrument holding means 30 of the pen stocker 16. The motor 22, 78° 104.126 and the sensor 176 are
connected to the controller.

Next, the operation of this embodiment will be explained with reference to the flowcharts shown in FIGS. 1 and 11.

When the power switch is turned on, the unit holder 66
It moves to an initial setting position intermediate between the core supply tank stocker 82 and the writing instrument stocker 16, and waits at that position.

Next, the controller determines whether there is a pen presence/absence detection command to determine whether each writing holding means 30 of the writing instrument stocker 16 holds the pencil holder 12 (block 1), and if it determines affirmatively.

The controller drives the motor 22 to rotate the writing instrument stocker 16 and remove the writing instrument holding means 3 of the stocker 16.
0 in front of sensor 176. Each time the writing instrument holding means 30 moves, the sensor 176 detects the opposing writing instrument holding means 30 at a timing from the controller.
detecting whether or not the person is holding the pencil holder 12;
Input the detection signal to the controller (block 2)
#The controller places the pencil holder 1 at the No. position corresponding to each writing instrument holding means 30 of the writing instrument stocker 16 on the table in the memory based on the detection signal from the sensor 176.
Write the presence/absence signal of 2. Next, the controller determines whether or not there is a core feeding command (block 3), and if it determines in the affirmative, the controller drives the motor 22 to rotate the stocker 16 and hold the pencil holder 12 to be cored. The writing instrument holding means 30 is made to face the unit holder 66. Next, the controller drives the motor 78 to rotate the belt 80, and the rotation of the belt 80 moves the unit holder 66 in a direction approaching the writing instrument stocker 16 along the guide shafts 70, 72. let Due to this movement, the writing instrument holding means 68 of the unit holder 66 grips the pencil holder 12 held by the writing instrument holding means 30 of the writing instrument stocker 16. Here, the controller determines whether or not the unit holder 66 has moved to a position where the pencil holder 12 can be taken from the writing instrument stocker 16 (block 4). For example, if the power is turned off while the writing instrument holding means 68 of the unit holder 66 is holding the pencil holder 12 in the previous core feeding operation, the unit holder 66 may be in a state where the pencil holder 12 is being held. Complete the core feeding operation. When the current core feeding operation is restarted from this state, the unit holder 66 moves to pick up the designated pencil holder 12 of the writing instrument stocker 16 while holding the pencil holder 12, as shown in FIG. I'm going to go. In this case,
The pencil holder 12 on the unit holder 66 side and the pencil holder 12 on the writing instrument stocker 16 side collide, and the unit holder 66 is locked at a distance G@ from the pencil holder exchange position in FIG. This state can be detected by the controller comparing the set movement amount of the unit holder 66 with the actual movement amount and detecting the difference G. In this case, the controller makes a negative determination in block 4 and firstly stores the writing instrument stocker 16.
It is determined whether there is any writing instrument holding means 30 on the side that is empty, ie, does not hold the pencil holder 12 (block 8). If the controller determines negative, the controller displays on the display unit that there is no space on the writing instrument stocker 16 (block 11), then determines whether to reset the writing instrument stocker 16 (block 12), and selects an affirmative. Once determined, the writing instrument stocker 16 is reset and initial operations such as setting the origin position of the stocker 16 are performed (block 13). The controller then moves to block 8. When the controller makes an affirmative determination in decision block 4, it drives and controls the writing instrument stocker 16 so that the empty writing instrument holding means 30 thereof faces the writing instrument holding means 68 of the unit holder 66, and in this state, the unit holder 66 is held as a writing instrument. The pencil holder 12 held by the unit holder 66 is returned to the writing instrument stocker 16 by driving in the direction of the stocker 16 (block 9). Next, the controller moves the unit holder 66 along the guide shafts 70 and 72 to a position separated from the writing instrument stocker 16 by a predetermined distance, and then rotates the writing instrument stocker 16 to select one writing instrument holding means. 30 to face the unit holder 66. From this state, the controller moves the unit holder 66 toward the writing instrument stocker 16, causes the writing instrument holding means 68 of the unit holder 66 to grip the pencil holder 12 held by the selected writing instrument holding means 30 of the writing instrument stocker 16, and then After that, the unit holder 66 is moved by a predetermined amount to the guide shafts 70, 72.
along the stocker 16. Thereby, the unit holder 66 takes the selected pencil holder 30 from the writing instrument stocker 16 and holds it (block 10). Writing instrument holding means 68 of unit holder 66
However, after the selected pencil holder 12 has been taken from the writing instrument stocker 16, the controller then drives the motor 78 to move the unit holder 66 below the core supply tank stocker 82. The exchange operation of the pencil holder 12 between the writing instrument holding means 68 of the unit holder and the writing instrument holding means 30 of the writing instrument stocker 16 is as follows.
This operation is the same as the pencil holder exchange operation between the drawing head 6 and the writing instrument stocker 16.

Before the unit holder 66 moves to the core supply operation, the controller controls the rotation of the core supply tank stocker 82 in advance, selects one of the plurality of core tanks 106, and selects one of the core tanks 106 from the selected core tank 106. is positioned directly above the upper knock plate 132. In this state, the unit holder 66
moves to the core feeding position below the upper knock plate 132, the knock mechanism 34 of the pencil holder 12 is inserted into the forked part of the upper knock plate 132, and the flange 134 of the pencil holder 12 is placed on the lower surface of the knock plate 132. opposite. Next, the controller drives the motor 126 to rotate the arm rotation shaft 124. This causes the pin 130 of the arm 128 to push the shutter plate 116. When the shutter plate 116 is pushed, the lead guide 112 protrudes from the shutter plate 11, and the other writing lead 108 moves to the lead guide 1.
12. Shutter plate 116
is pushed to a predetermined locking position by the pushing force of the arm 128, the shutter hole 122 of the shutter plate 116 closes.
coincides with the lower end of the lead guide 112, and the writing lead 108 in the lead guide 112 falls due to its own weight and falls into the lead passage 44 of the knocking mechanism 34 of the pencil holder 12. Next, the controller moves the unit holder 66 within a predetermined range.
, in the left and right direction in FIG.
The roller 136 is pushed down by the protrusion 140a of 0. As a result, the upper knock plate 132 swings clockwise in FIG. 12, and by swinging the knock plate 132,
The flange 134 is depressed and the writing lead 108 is guided into the lead chuck mechanism 36 of the pencil holder 12. This completes the operation of pushing the lead into the pencil holder 12 held by the unit holder 66. The controller is
While returning the arm 128 to its original position, move the unit holder 66 beyond the core feeding position to the left in FIG.
Moving along the guide shaft 70.72, the lower knock plate 142
The small diameter portion 38a of the pencil lead displacement mechanism 38 of the pencil holder 12 is inserted into the forked portion of the pencil holder 12.

Further, when the unit holder 66 is moved to the left in FIG. 12, the tapered portion 148 of the unit holder 66 collides with the roller 144 and pushes it down. Kokoro 14
4, the knock plate 142 rises and pushes up the pencil lead displacement mechanism 38 of the pencil holder 12 held by the writing instrument holding means 68 of the unit holder 66. By repeating this pushing up action and the pushing down action of the upper knock plate 132 several times by reciprocating the unit holder 66, the remaining lead in the pencil holder 12 is dropped into the remaining lead discharge hole 150, and a new lead is created. is caused to protrude by a predetermined amount from the tip of the pencil holder 12. The remaining core is detected by the remaining core detection sensor 15.
6 and input to the controller. As the unit holder 66 moves to the core supply position and the remaining core discharge position, the rollers 158, 160 and the sensor mounting plate 152
By engaging with the rising portions 152a and 152b, the sensor mounting plate 152 is interlocked with the unit holder 66, and when the remaining core is discharged, the remaining core detection sensor 156 is connected to the unit holder 66.
The pencil holder 12 is always located directly below the pencil holder 12 held by the pencil holder 12.

The mechanism for interlocking the core detection sensor 156 with the movement of the unit holder 66 is not particularly limited to a structure in which the sensor mounting plate 152 is engaged with the unit holder 66 and interlocked with each other, but as shown in FIG. , the remaining core inspection sensor 156 may be directly attached to the holder unit 66 via the attachment fitting 157. Next, the controller moves the unit holder 66 in the direction of the writing instrument tracker 16, as shown in FIG.

The pencil holder 12 is attached to the core folded part 172 of the window opening adjustment plate 162.
The core 108 protruding from the tip of the unit holder 66 collides with the core 108, and by the moving force of the unit holder 66, the core 108 is broken from the middle to have an appropriate protrusion length. Furthermore, when the unit holder 66 is moved toward the writing instrument stocker 16, the lead 108 protruding from the tip of the pencil holder 12 moves to the upper surface of the window opening adjustment plate 162.

At this time, the rollers 158, 160 of the unit holder 66 push down the rollers 168, 170 of the window opening adjustment plate 162 as shown in Figure 7@, and the window opening adjustment plate 172 rotates around the shaft 164 as shown in FIG. The pencil holder 12 swings clockwise.
The lead 108 protruding from the tip of the pencil is pushed up into the pencil holder 12. During this push-up operation, the other protrusion 140b of the push-down plate 140 is located directly above the roller 136,
This roller 136 is pushed down, and the upper knock plate 132
As a result, the flange 134 is pushed down, and the knock mechanism 34 of the pencil holder 12 is in an open state. When the above operations are completed, the controller moves the unit holder 66 to the writing instrument stocker 1.
6, and unit holder 66.
The writing instrument holding means 68 holds the writing instrument. Block 6) Return the pencil holder 12 that has been supplied to its original position in the writing instrument stocker 16 (Block 7)
. When the operator turns off the power switch (block 1
4) In the judgment block 15, the controller determines that the writing instrument holding means 68 of the unit holder 66 is connected to the pencil holder 12.
It is determined from the table in the memory whether or not the unit holder 66 is holding the pencil holder 12. If the determination is affirmative, the display section displays that the pencil holder 12 is present in the unit holder 66 (block 16), and then the core feeding operation is in progress. (block 17). Judging the affirmative.

The display section displays that the core feeding operation is in progress (block 18), and the core feeding operation is completed (block 19). Next, the controller displays block 2 indicating that the pencil holder is being returned on the display.
0), the pencil holder 12 held by the unit holder 66 and having completed the core feeding operation is returned to its original position in the writing instrument stocker 16 (block 21). Next, the controller turns off the power to the controller and drive unit of the automatic drafting machine main body.

Through the above sequence, the unit holder 66 is placed in the writing instrument stocker 16 as shown in FIG.
It is possible to prevent the pencil holder 12 from colliding with each other when going to pick up the pencil holder 2.

In carrying out the present invention, the wick tank 128 is not particularly limited to having a plurality of structures, but may be one having a single structure. In addition, the push-down plate 140 and the upper knock plate 13
2. The knocking mechanism 34 of the pencil holder 12 constitutes a lead pushing means, but this means is not limited to the above-described structure shown in the figure, and is disclosed in Japanese Patent Application Laid-Open No. 1-78899, etc. A core pushing means using a known cam can be used.

〔effect〕

Since the present invention is configured as described above, even if a pen presence/absence detection sensor is not provided on the unit holder side, when the unit holder goes to pick up the pencil holder from the writing instrument stocker, it is possible to prevent the unit holder from being in a state without a pencil holder. Since this can be recognized in advance, it is possible to prevent malfunctions in which the unit holder moves to the accommodating operation position without the pencil holder.

[Brief explanation of the drawing]

Figure 1 is a flowchart, Figure 2 is an explanatory diagram, Figure 3 is an external view, Figure 4 is an external view, Figure 5 is an external view, Figure 6 is an external view, Figure 7 is a side view, and Figure 8 is a side view. The figure is a side view, Fig. 9 is an external view, Fig. 10 is an explanatory plan view, Fig. 11 is a flowchart, Fig. 12 is a side view, Fig. 13 is an external view, Fig. 14 is an external view, and Fig. 15 is a side view. 16 is a side view, FIG. 17 is a front view, FIG. 18 is a sectional view, and FIG. 19 is a side view showing another embodiment. 2... Body, 4... Platen, 6... Drawing head, 8... Steel belt, 1o... Writing instrument holding means, 12... Pencil holder, 14... Base, 16
...Writing instrument stocker, 18...Spindle, 20...
Board, 22... Motor, 24... Board, 26... Mark, 28... Sensor. 30... Writing implement holding means, 34... Knock mechanism, 3
6... Lead chuck mechanism, 38... Pencil lead displacement mechanism,
40... Case, 42b... Core, 44... Thought channel, 46... Knock spring, 48... Chuck member, 50... Ball, 52... Chuck case, 54
．． 56... Chuck spring, 58... Spring, 60... Rubber ring, 62... Inner case, 64...
Spring, 66... Unit holder, 68... Writing instrument holding means, 70° 72... Guide shaft, 74.76.
...Pulley, 78...Motor, 80...Belt, 8
2... Core supply tank stocker, 84... Disc, 86.
...Box, 88...Disc body, 90...Mark, 9
2...Sensor, 94, 96...Pin hole. 98.100...pin, 102...gear, 104.
・Motor, 106... Core tank, 108... Core, 1
10... Core storage section, 112... Core guide, 114.
... Spring, 116 ... Shutter plate, 118 ... Recessed part, 120 ... Protrusion, 122 ... Shutter hole,
124...Arm rotation axis, 126...Motor, 128
... Arm, 130 ... Pin, 132 ... Dowel plate, 134 ... Flange, 136 ... Roller, 140
...Push down plate, 142...Knock plate, 144...
Coro, 146...axis, 148 river 7--pa part, 150
... Remaining core discharge hole, 152 ... Sensor mounting plate, 154
...Slide guide member, 156...Sensor, 15
8,160...Colo, 162...3 Adjustment plate, 164
,166...axis, 168,170...coro. 172... Core folding edge, 174... Core remaining discharge hole, 1
76...Sensor.

Claims (1)

[Claims] (1) A writing instrument stocker 16 rotatably disposed on the body side of the automatic drafting machine, which has a plurality of writing instrument holding means 30 for detachably holding the pencil holder 12, and a writing instrument stocker 16 that can be approached and separated from the writing instrument stocker 16. The writing instrument stocker 16 and the writing instrument stocker 16 are equipped with a unit holder 66 arranged to be movable in the direction, and a lead pushing means for pushing the long lead in the pencil holder 12 held by the writing instrument holding means 68 of the unit holder 66 to a predetermined position. In an automatic core supply device for an automatic drafting machine, in which the pencil holder 12 can be automatically exchanged mutually between the drawing head of the automatic drafting machine and between the unit holder 66 and the writing instrument stocker 16. A pen holder presence/absence detection sensor 176 is disposed facing the writing instrument stocker 16, and this sensor 176 detects whether or not each writing instrument holding means 30 of the writing instrument stocker 16 is holding the pencil holder 12, and from this detection result, the A method for detecting the presence or absence of a pen, characterized in that the pencil holder 12 is not retrieved from the writing instrument holding means 30 of the writing instrument stocker 16 when the unit holder 66 is empty.