JPH01249397A - Writing implement lifting control of x-y plotter - Google Patents

Abstract

PURPOSE:To enable efficiency detection of a state where lead does not exist by detecting a descent value only right after an upper tubular body is allowed to ascend at a large stroke but not after said body is moved upward at a small stroke. CONSTITUTION:After the completion of drawing a single line of picture, an allowable descending distance PO' to the lower tubular body 132 of lead chucks 152, 154 and a lead length corresponding to the linear portion of a command for a next single line are compared based on the position of a tubular body 134. If PO' is a smaller value, the upper tubular body 134 is allowed to ascend to the top and thereby the lead chucks 152, 154 are set at the top. After this, the upper tubular body 134 is allowed to descend and if PO' is a larger value, the upper tubular body 134 is allowed to ascend over a comparatively short distance to create a pen-up state, and to proceed to the single picture line drawing action. At that time, the descent value of the lead 150 which comes into contact forcefully with a picture drawing surface 56a from the top of the upper tubular body 134 is detected only right after the upper tubular body reaches the top. Next, the detected descent value is compared to the sum of the distance between the lower end of the lead 150 when the upper tubular body 134 reaches the top and the picture drawing surface 56a, with a specified value. The if the descent value is larger, it is interpreted that the lead 150 has come off the lead chucks 152, 154.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to an X-Y plotter when the lead inside a writing instrument is worn out by a predetermined amount and shortened, and when the lead comes off the lead chuck built into the writing instrument. , relates to a coreless detection method for detecting this state.

[Conventional technology]

1iii Hold a writing instrument with a built-in lead chuck in the pen holder of the IIIA head, lower the pen holder, press the tip of the lead held by the lead chuck against the drawing surface, and in this state move the drawing head relative to the drawing surface. Move in the X-Y direction and draw on the drawing screen, and when drawing for one line is completed,
X-Y where the pen holder rises to the highest position and the lead chuck slides up relative to the lead.
A plotter is disclosed in Japanese Patent Laid-Open No. 132394/1983.

[Problem that the invention seeks to solve]

In the above-mentioned X-Y plotter, when the lead wears out and becomes short, the lead comes off from the lead chuck.
The lead chuck presses the upper end of the lead toward the drawing surface with its lower end surface, and drawing is performed in this state. However, when drawing in this state, the top end of the lead gets scraped by the bottom end of the lead chuck.

There was a defect in that this core powder adhered to the core chuck, reducing the durability of the core chuck.

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

[Means to solve problems]

In order to achieve the above object, the present invention includes a lower tube body 132, an upper tube body 134 that is movable in the axial direction with respect to the lower tube body 132, and core chucks 152, 154 built in the upper tube body 134.
The upper tube body 134 is attached to the core chuck 152,154.
When a force is applied to move the core 150 in an upward direction relative to the lead chuck 152, 154, the lead chucks 152, 154 grip the inserted lead 150, and when the force is released, the gripping force is released and the lead chucks 152, 154 Core 1 protruding from lower tube body 132
Reference numeral 50 denotes a writing instrument that holds the upper tube body 134 in a pen holder 68 of the drawing head 62, and is configured to return to the inside of the lower tube body 132 by a relatively short predetermined return amount when the gripping force is released. and the lower tube body 13
2 is held in a fixed position by the drawing head 62, and while the pen holder 68 is controlled to move up and down, the drawing head 62 is sent in the X-Y direction relative to the paper to draw a predetermined drawing on the paper. In the X-Y plotter configured as above, after drawing one line, the lowering distance PO' of the core chuck 152, 154 with respect to the lower tube body 132 and the length of the command line for the next one line are determined. an encoder 92 that converts the position of the upper tubular body 134 into an electrical signal with a corresponding core length;
The possible descending distance PO' is compared based on the output data of
is smaller than the line segment core length, the upper tube body 13
4 to the highest position and the core chuck 152.15
4 is set to the highest position, the upper tube body 134 is lowered to proceed to the drawing operation based on the next one-line segment command, and when the lowering possible distance *po' is larger than the line segment core length, , the upper tubular body 134 is raised over a relatively short distance to bring it into a pen-up state, and then a drawing operation based on a primary 1 m minute command is performed, and before shifting to the drawing action, the It is determined whether or not the upper tube body has just been raised to the highest position, and only when the upper tube body has been raised to the highest position, the drawing screen 56a of the upper tube body 134 is moved from the highest position to the highest position. The amount of descent until the core 150 comes into pressure contact with the upper pipe body 13 is detected.
4 Compare the data obtained by adding a predetermined value to the distance between the lower end of the lead 150 and the work surface 56a at the time of the highest rise, and if the amount of descent is greater than the data, the lead chuck 152°1
54 to recognize that the core 150 has come off. When the upper tube body 134 is raised with a large stroke, the lead is let out from the lead chucks 152, 154 by a predetermined amount. When the lead is fed out from the lead chucks 152, 154, the upper tubular body 134 moves a distance # that is relatively shorter than the above-mentioned large stroke until this amount of feeding is exhausted.
Raising and lowering are performed with l (small stroke). When the upper tubular body 134 is controlled up and down with a small stroke, the lead length and drawing amount are taken into consideration, so the lead does not come off the lead chucks 152, 154. Therefore, the above-mentioned leadless detection is performed as follows. There is no need to detect when the upper tube body 134 rises with a small stroke. Core is core chuck 152,1
54 comes off when the upper tube body 134 is raised to the highest position with a large stroke. Therefore, the present invention applies only when the upper tube body 134 moves up with a large stroke.

Whether the lead has come off from the lead chucks 152, 154, that is,
It is designed to detect if there is no core.

[Effect]

When the upper tube body 134 rises to the highest position, the lower end of the lead 150 returns to a predetermined position below the writing instrument 70. This means that if it is assumed that the facing distance between the drawing surface 56a and the drawing line rad 62 does not change at any position on the drawing surface 56a, the core chucks 152, 15 interlocking with the upper tube body 134
If the lead 150 is inserted into the opening/closing part 160 of
The amount of descent until the lower end of the lead 150 held by the handle 4 comes into pressure contact with the work surface 56a is always constant. However, when the core 150 is shortened due to wear and the upper tube body 134 is raised to the highest position, the core 150 is shortened by the core chuck 152,
It comes off the bottom end of 154.

If there is a distance between the lower end of the lead chucks 152, 154 and the upper end of the lead 150, the amount by which the upper tube 134 is lowered from its highest position is the amount by which the lead 150 is placed in the lead chucks 152, 154.
0 which increases by the above distance compared to the case where 50 is inserted.
In the present invention, the actual descending amount of the upper tubular body 134 from the highest position and the distance between the lower end of the lead 150 and the working surface 56a when the upper tubular body 134 is raised to the highest position, that is, the lead chucks 152, 1
Upper tube body 134 when core 150 is inserted into 54
The data is obtained by adding a predetermined value that takes into account the height difference of the drawing surface 56a to the amount of descent from the highest position of the drawing surface 56a.

Based on the result of the comparison, the core chuck 1
52. Determine whether or not the center is off from 154. When the upper tube body 134 is raised with a large stroke, the lead is let out from the lead chucks 152, 154 by a predetermined amount. When the lead is fed out from the lead chucks 152, 154, the upper tubular body 134 is raised and lowered over a relatively shorter distance (small stroke) than the above-mentioned large stroke until the amount of feed is exhausted. When the upper tubular body 134 is controlled up and down with a small stroke, the core length and drawing amount are taken into consideration, so the core never separates from the core chuck 152°154. Therefore, the above-mentioned coreless detection is performed. , upper pipe body 1
There is no need to detect when the upper tube 134 is raised with a small stroke, and when the lead comes off the lead chuck 152, 154, the upper tube 134 is raised to the highest position with a large stroke. Therefore, in the present invention, only when the upper tube body 134 rises with a large stroke, the core chuck 152°154
The system detects whether the core has come off or not, that is, there is no core.

〔Example〕

The structure of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

In FIG. 6, reference numeral 50 indicates the body of a paper-driven X-Y plotter.
A rail 54 is fixedly installed. Both sides of the paper 56 on the mounting plate 52 are supported by a pinch roller mechanism (not shown) consisting of a drive roller and a press roller arranged on both sides of the mounting plate 52.

The sheet 56 on the mounting plate 52 is transported back and forth (eleven directions) by rotation of the drive roller driven by an X motor 58 (see FIG. 2). Said Y
The rail 54 has a Y cursor (
(not shown) is attached, and a drawing head 62 is fixed to the Y cursor. A box 64 is disposed on the body 5o at one end of the Y rail 54,
In the box 64, a known one-rotation type writing instrument stocker (Cal-Zel) 66 is disposed.

The writing instrument stocker 66 is linked to the output shaft of a motor 67 with a reduction gear, which is fixed to the box 64, as shown in FIG. A pair of discs 66a, 6 of the stocker 66
There are pen holders 6 at regular intervals on the horizontal part consisting of pen holders 6b.
8 is formed.

Grooves are formed in the outer peripheries of the disks 66a and 66b of the stocker 66 to fit and hold the peripheral surfaces of the writing implements 70, and a pen stopper 72 is fixedly installed between the upper and lower grooves. 74 is a rotating arm, and the disks 66a and 66
b, and is rotatably supported by a shaft 76 and biased in one direction by a spring. The grooves of the discs 66a and 66b, the pen stopper 72, and the rotating arm 74 constitute the pen holder 68. The writing instrument 70 has a disk 66a on its half circumference.
, 66b and the wall of the pen stopper 72, and in this state, the rotating arm 74 is placed in contact with the wall surface of the groove of the writing instrument 72.
The flange of the writing instrument 70 is removably fitted between the upper end of the pen stopper 72 and the lower surface of the disk 66a, and by these interactions, the writing instrument 70 is removably held in the pen holder 68. has been done. The writing instrument 70 is configured to be able to be automatically exchanged between a desired pen holder 68 of the writing instrument stocker 66 and the pen holder 78 of the drawing head 62.

Incidentally, since the structure for automatically exchanging writing instruments is well known, a detailed explanation thereof will be omitted.

The motor 67 and the X-Y motors 58, 60.

It is configured to be controlled by a central processing unit 82 or CPU of a controller 80 that is connected to a host computer via an I10 device.

Next, the structure of the printing head 62 will be explained with reference to FIG.

84 is a DC motor, which is fixed to a vertical wall 86a that is integral with the substrate 86 of the printing head 62.

A shaft body 88 is rotatably installed on the vertical wall 86a and the vertical wall 1186b facing the vertical wall 86a, and a tube body 9 is attached to the shaft body 88.
0 is fixed. A lobe pulley 9 is attached to the tube body 90.
0a and the large gear 90b are integrally formed. A rotary encoder 92 is fixed to the vertical wall 86a,
The small gear 94 fixed to the input shaft of the encoder 92 is
It meshes with the large gear 90b. A small gear 96 fixed to the output shaft of the DC motor 84 is in mesh with the large gear 90b, with an interval of 180 degrees from the small gear 94. A guide shaft 98 is vertically installed between the substrate 86 and the horizontal portion formed on the vertical u86b, and the inner diameter portion of the elevating body 100 is slidably fitted to the guide shaft 98 via a slide ball bearing. 6
A known pen holder 78 is fixed to one side of the elevating body 100, and a projecting piece 102 is fixed to the other side of the elevating body 100. A rope pulley 104 is attached to the base Fi 86, and the pulley 104 has a lobe tension 11.
The height can be increased by axW by rotating the screw 108 of the 111 machine 1i1106. One end of the wire robe 110 wound around the rope pulley 104 is passed around the rope pulley 104, and the one end is fixed to the projection piece 102 with a screw 112. The other end of the wire lobe 110 has a screw 1
14 to the protruding piece 102. Said D
As shown in FIG. 2, the C motor 84 is connected to a motor drive circuit 116. Amplifier 118. and is connected to the CPU via a D/Δ converter 120. The rotary encoder 92 is connected to the CPU via a direction determining circuit 124 and an up/down counter 126. In FIG. 7, 130 is a support piece fixed to the substrate 86,
The small diameter portion 132a of the lower tube body 132 of the writing instrument 70 held in the pen holder 78 fits into this slot, and the annular horizontal surface 132b of the tube body 132 is aligned with the upper surface of the support piece 130 as shown in FIG. It is locked to.

Next, the structure of the writing instrument 70 will be explained with reference to FIG.

134 is an upper tube body, and a flange portion 134a is formed along the outer periphery. A tubular chuck guide 136 and a guide tube 138 are fixed to the inner diameter portion of the upper tubular body 134. The outer circumferential surface of the lower tube body 132 is slidably fitted into the inner circumferential surface of the guide tube 138, and the lower surface of the protrusion 132a formed at the upper end of the lower tube body 132 is moved by the elastic force of the coil spring 140. , is in elastic contact with a stopper 138a formed on the inner diameter portion of the guide tube 138.

A pipe 142 is disposed on the inner diameter portion of the lower tube body 132 so as to be able to rise and fall freely, and the upper end of the pipe 142 is connected to a stopper fixed to the middle portion of the lower tube body 132 by the elastic force of a coil spring 144. It is in elastic contact with the ring 146. The pipe 142 includes a rubber lifting pipe 148.
The small diameter portion of the lifting pipe 148, the small diameter portion of the lower tube body 132, and the small diameter portion of the upper tube body 134 constitute a guide for the lead core 150. Reference numerals 152 and 154 denote a pair of core chucks disposed opposite to each other in the chuck guide 136, and on both sides of the lower part thereof, facing the tapered walls 136a formed in the chuck guide 136.
The ball receiver is formed with a hole 156, and the ball receiver is formed with a hole 156.
A steel ball 158 is loosely fitted therein. The core chuck 1
The gaps between the lower opening/closing parts 160 of the steel balls 52 and 154 are configured to be narrowed by the pressure from the steel balls 158. The core chucks 152 and 154 are urged upward by the elastic force of the coil spring 162.

Due to the biasing force, the steel ball 158 is brought into elastic contact with the tapered wall 1368 surface of the chuck guide 136.

When a biasing force is applied to the core chucks 152 and 154 in a direction that causes them to rise relative to the chuck guide 136, a clamping force is generated between the core chucks 152 and 154.
Opening/closing part 1 of the lead core 150 between the core chucks 152 and 154
Fixed at 60. Further, the clamping force is configured to be released when a biasing force is applied in a direction opposite to the upward direction. Therefore, when the lead core 150 between the lead chucks 152 and 154 tries to rise, this rising force is transmitted to the lead chucks 152 and 154 via the frictional force between the lead core 150 and the lead chucks 152 and 154. , the lead core 150 is fixed to the opening/closing part 160 of the core chucks 152 and 154, and the lead core 150 cannot rise relative to the core chucks 152 and 154, and even if no lifting force is applied to the lead core 150, The lead core 150 is fixed to the opening/closing part 160 by the action of a coil spring 162.

Place the lead lead 150 between the lead chucks 152 and 154 of the writing instrument 70.
When inserting from above, the downward force of the lead core 150 is transmitted to the core chucks 152, 154 by frictional force, and the core chucks 152, 154 are urged in the downward direction relative to the chuck guide 136, so that they cannot be opened or closed. The clamping force of the portion 160 is released. Therefore, the lead core 150 is attached to the core chuck 152,
154 in a downward direction.

When the lead core 150 is inserted into the inner peripheral surface of the lift, the lead core 1
The structure is such that a predetermined frictional force is generated between the lifting pipe 50 and the lifting pipe 148. Therefore, when the lead core 150 descends against the frictional force, the elevating pipe 148 resists the elasticity of the coil spring 144 due to this elevating force.
Predetermined distance specifically.

It is set to descend by at least 1 mm.

Therefore, the lead core 15 protruding from the lower end of the lower pipe body 132
0 is always urged upward by the elastic force of the coil spring 144. The lower end of the lower tube body 132 and the drawing surface 5
6a is set to approximately 1 mm, and the distance between the lower end of the guide ml 38 and the upper surface of the support piece 130 is set to 6 mm.

Next, the operation of this embodiment will be explained.

First, a new lead 150 is inserted into the writing instrument 70 and set. The core 150 is pushed in until its upper end is at the same level as the upper end of the upper tube body 134.

The length of the core 150 is set so that the lower end of the core 150 exactly matches the lower end of the lower tube body 132.

The writing instrument 76 is held in each pen holder 68 of the writing instrument stocker 66. In a state where the pen holder 78 of the IiI line head 62 holds the writing instrument 70 so as not to shift in the vertical direction, the central processing unit of the controller 80! When a pen-down digital signal is output from I82, that is, the CPU, this signal is converted into an analog voltage signal by the D/A comparator 120, and is supplied to the motor drive circuit 116 via the amplifier 11B, and output from the motor 84. The shaft rotates in the positive direction. By driving this motor 84.

The pinion 96 rotates in the forward direction, and this rotation is transmitted to the tube body 90, and one of the wire ropes 110 is connected to the rope pulley 9.
0a, the other wire lobe 110 is let out from the lobe pulley 90, and the elevating body 100 descends. As the elevating body 100 descends, the pen holder 78 descends, and the writing instrument 7 held in the pen holder 78
The upper tube body 134 of No. 0 moves down against the elasticity of the coil spring 140. As the upper tube body 134 descends, the chuck guide 136 and the core chuck 152.
154 is lowered, and the lead core 150 inserted between the core chucks 152 and 154 is lowered. When the lead core 150 descends, due to the frictional force between the lead core 150 and the lifting pipe 148, the lifting pipe 148 moves downward in conjunction with the lead core 150 against the elasticity of the coil spring 144.

When the upper tubular body 134 has descended approximately 1 mm from the highest position, the lead core 150 collides with the first drawing surface 56a. Lead core 1
50 collides with the drawing surface 56a, if the upper tube body 134 still tries to descend due to the driving force of the motor 84,
The lead core 150 tends to rise relative to the core chuck 152, 154.

This lifting force of the lead core 150 is the rj of the lead chucks 152, 154! When the frictional force is transmitted to the I-closing part 160, the core chucks 152, 154 tend to rise relative to the chuck guide 136, but this rising force is blocked by the tapered wall 136a of the chuck guide 136, and The opening/closing portion 160 of the lead chuck 152° 154 acts strongly in the closing direction, and the lead core 150 is more firmly gripped by the opening/closing portion 160 of the lead chuck 152° 154. In this state, the lead core is pressed against the drawing surface 134 by a predetermined voltage generated by the driving force of the DC motor 84, resulting in a so-called pen-down state. The amount of descent of the upper tubular body 134 is converted into a pulse signal having directionality by the rotary encoder 92, and is supplied to the up/down counter 126 via the direction discrimination circuit 124, and the output of this counter 126 is used.

The CPU recognizes how far the writing instrument 70 has moved in the downward direction. In the above pen down state.

Under the control of the CPU, the paper 56 is moved in the 9 front-back direction (X
When the feed one-line head 62 is moved along the Y rail 54 in the direction (direction), a predetermined line is drawn on the paper 56. During this drawing, as the lead core 150 decreases, the outer tubular body 134 is lowered by the drive of the motor 84 as the tip of the lead core 150 decreases, and in conjunction with this lowering, the chuck guide 13
6. The core chucks 152, 154 and the lead core 150 are lowered.

The lead lead 150 always presses the paper 5 on the mounting plate 52 with a predetermined writing pressure.
Maintain a state in elastic contact with the upper surface of 6, that is, the drawing surface 5flEa,
The position signal of the external pipe body 134 is constantly supplied to the CPU by the up/down counter 126. CPU
When the motor 84 is driven in the opposite direction based on the pen up signal, the pen holder 78 is raised. As a result, the upper tubular body 134 rises, and the guide tube 138 rises along the outer peripheral surface of the lower tubular body 132. Until the rising distance of the upper pipe body 134 reaches #ll mm, the lead core 150
The core chuck 152.1 rises in conjunction with the return movement of the lifting pipe 148 by the coil spring 144.
54 rises with its opening/closing part 160 closed. After the lifting pipe 148 is locked with the stopper, when the upper pipe body 134 further rises, the lead core 150 is attached to the lifting pipe 14.
8, the core chuck 15 is held by the frictional force.
2,154 will rise. Therefore, lead core 15
The frictional force on the lead chuck opening/closing part 160 of 0 acts downwardly relative to the opening/closing part 160, thereby reducing the clamping pressure of the opening/closing part 160, and the lead chucks 152, 154 move upwardly. In conjunction with the pipe body 134, the lead core 1
50 while sliding up to the highest firing position. At this time, the lower end of the lead core 150 is exactly 0.
It will be at the same level as the bottom edge of.

As is clear from the above explanation, the pen-up operation is performed from a state where the lead core 150 is in elastic contact with the drawing surface to a state where the upper tube body 13
It is sufficient to raise the lead core 1 by 4mm (small stroke).
The centering operation for moving the fixed position relative to 50 can be performed by raising the outer tubular body 134 to the highest position (large stroke).

Next, centering and core breakage detection operations will be explained with reference to FIG.

The initial state of the writing instrument 70 is defined as a state in which the pen holder 78 of the drawing head 62 holds the writing instrument 70 at the highest position and the upper tube body 134 of the writing instrument 70 is at the highest position (block 1). If the length of the line that can be drawn with the chucks 152 and 154 fixing the lead core 150 is converted into the length of the lead core, the value PO is the 6th order, which is set to PO = 5 mm in this embodiment. PO in block 2
=PO'. When a one-line drawing command is input from the host computer to the I10 device of the controller 80 (block 3), the CPU calculates the output data of the up-down counter 126, that is, the deviation of the external tube body 134 of the writing instrument 70 from the set reference position. This pen position data P1 indicates the highest position of the upper tube body 134.The CPU reads the pen position data P1, which is the amount of the line segment (block 4), which indicates the highest position of the upper tube body 134. It is determined whether the lead length to be used is larger than the PO (block 5), and if not, the pen holder 78 is lowered, the tip of the lead lead 150 is brought into contact with the drawing surface 56a (block 6), and this pen is lowered. 0 Next, the CPU reads the output data P2 of the up-down counter 126, that is, the position data of the upper tube 134.
Block 8) to judge whether or not it has just risen to the highest position with a large stroke; if Yes, next.

The CPU determines whether P2-PI, that is, the amount of descent of the writing instrument upper tube body 134 from the highest position, is greater than (stroke + α). The lead core 150 is the core chuck 152
, 154, the above P2-Pi
is the distance from the state where the lower end of the lead core 150 is at the same level as the lower pipe body 132 to when it comes into contact with the drawing surface 56a, that is, 1 mm.
It is.

However, the lead core 150 has become short and has come off the opening/closing part 160 of the lead chuck, and when the upper tube body 134 is in the highest position, the lower end of the lead chucks 152, 154 and the lead core 150 are separated from each other.
If there is a gap of, for example, 1 mm between the upper end and the upper end, the lower end of the lead core will come into contact with the drawing surface 56a and be locked when the upper tube body 134 has descended 2 rom from the highest position. That is, the lower end and the lead core 150 are attached to the lead chucks 152 and 154.
The amount of descent of the upper tube body 134 increases by the distance between the upper ends. From this, if (P2-Pi) exceeds a certain amount, lead core 1
50 is shortened and removed from the lead chucks 152, 154. The fixed amount for this L12 is a value α that takes into account the height error of one drawing screen 56a,
When the lead core 150 has become short and has come off the core chucks 152 and 154.

An appropriate value is set with reference to the stroke when the upper tube body 134 is lowered from the highest position until the lead core 150 comes into pressure contact with the drawing surface 56a. (P2-PI)>Stroke+α (block 9), the CPU detects that there is no lead, and the drawing head 62 is placed in the writing instrument stocker 66.
When it is determined in block 8.9 that the writing instrument 70 is exchanged between the
Control 1! Finish drawing for minutes (block 10)
.

This one! When the drawing for the minute is finished, the CPU.

The output data P3 of the up/down counter 126 indicating the height position of the writing instrument upper tube body 134 is read.

Next, CPtJ is PO' = PO' - (P3-P2
), the core chucks 152, 154
The distance that can be lowered with respect to the lower tube body 132, that is, the length PO' of the remaining core is calculated. This remaining lead length PO' is the lead core 1
50 actual length, not the core chuck 152, 154
indicates the length of the lead core that can be drawn when holding the lead core 150, that is, when PO' is 2 when drawing is completed.
If mm.

The writing instrument upper tube body 134 reaches the lowest position at the time when a drawing with a length corresponding to the lead of 112 mm is completed. That is, the fifth
In the figure, the lower end of the guide tube 138 reaches the upper surface of the support piece 130, indicating that one drawing becomes impossible.
The DC motor 841 is driven to move the pen holder 78 of the one-line head 62 with a set small stroke (1 m in this example).
m) Raise (block 13), at this time, the coil spring 144 of the lifting pipe 148 causes the lead core 15 to
0 also rises by approximately the same amount as the rising amount of the upper tube body 134 of the writing instrument, and the opening/closing parts 160 of the lead chucks 152 and 154 remain closed, that is, while holding the lead lead 150.
When the xis minute command is entered (block 14), the C
The PU determines whether the centering corresponding to the length of the line segment of the above command is greater than the remaining core amount PO'' (block 15); if NO, the process moves to block 3; If there is, raise the pen holder 78 of the one-stroke handle 2 with a large stroke to the highest position, and then remove the lead chuck 152.1.
54 is moved to the upper part of the lead core 150 (block 16).

Next, move to block 2. When the determination block 4 is YES, the CPU moves the core chuck 15
2.154 is the centering data (5 mm in this example) that can be drawn while holding the lead core 150, and is multiplied by an arbitrary value (for example, 3/4) in consideration of the error. Core chuck 152,
154 determines a line drawing area that can be drawn while holding the lead lead 150 (block 17) 6 Next, the upper tube body 1 of the writing instrument
34 and brings the lower end of the lead core 134 into contact with the drawing surface 58a (block 18).Next, read the output data P2 of the up/down counter 126 (block 19)
In the 0th order, the CPU determines whether or not the upper pipe body 134 has just moved up by a large stroke (block 20); if Yes, in the 1st order, the CPU determines whether or not the above P2-Pi>Stroke+α. If YES, detects the lack of a lead and moves to the writing instrument exchange program; if NO, or if No is determined in the above decision block 20, the i1 line hesid 62 changes the line length. Draw for Ω minutes (
Block 22) 0 Next, the DC motor 84 is driven to move the writing instrument up to the upper tube body 134 at the highest level wL* to perform a centering operation. Saga is the above PO.

block 24).

If YES, the process moves to block 17; if NO, the process moves to block 6.

In the above embodiment, the lead chucks 152 and 154 move the lead core 152 and 154 until the lead core is consumed for a predetermined stroke (fimm) by comparing the fi core amount and the centering distance corresponding to the next drawing distance.
0 is maintained, the lead chuck opening/closing part 16 is dramatically reduced compared to the case where the centering operation is performed every time the pen is raised.
0, the number of opening and closing times of the core chuck 152.
154 durability can be improved. However, when the number of dots increases due to a series of short line segments, the core chuck 1
The lead core was scraped by the gripping force of 52.154.

A defect occurs in which the lead core slips against the core chuck 152,154. Therefore, we compared the Zanshin and the next work - 3 pieces corresponding to the Toho Bokuko, and performed the centering operation if the next line segment was drawn with the Zanshin. In addition, the above problem is solved by adding a primary operation button.

First, when the CPU outputs a pen down command (block 41), the counter in the CPU counts +1 (block 42). When the external pipe body 134 of the marking device descends (block 43), it is determined that 111 minutes of drawing has been completed (block 44), and the CPU executes the above-mentioned counter IS! It is determined whether the count value is N times (for example, N=lOOOO) or not (block 45), and if No, the centering value is set so that the fi center amount po' corresponds to the first order lli: ノ is also large. It is determined whether block 4 (3) is true, and if NO, the CPU is
The pen holder 78 is raised by 1 mm (small stroke) (block 47), and in the 0 determination block 45, which moves to block 41, a Yes determination is made.

After resetting the counter to zero (block 48), the CPU moves the pen holder 78 to the highest position (I!).
Raise the lead core 15 of the core chuck 152, 154
Move the grip position relative to 0.

Perform centering operation 1 (block 49) 0 Next block 41
to move to.

Next, another embodiment will be described with reference to FIG.

In this embodiment, ii. the pen holder 78 of the m head 62;
While holding the writing A70 at the highest position, P
In the initial state layer where O is set to 3 mm (block 30), when a cpuL W repeat command is input (block 31), the CPU determines that the core length corresponding to the length of the line segment is PO (Block 3)
2) If NO, the pen holder 7 of the one-stroke head 62
8 is lowered (block 33), drawing is performed (block 34), and after the pen holder 78 is raised (block 35), the process moves to block 31.

If Yes in block 32, the core length (3+n
m) is multiplied by a predetermined error consideration value (for example, 3/4) to obtain line length data a that can be drawn.

Next, the pen holder 78 is lowered (block 37) to draw the 9-minute line segment (block 38), and then the pen holder 78 is raised to draw the lead chucks 152, 1.
54 with respect to the lead core 150 (block 39). Next, it is determined whether the remaining line segment is larger than PO (block 40). If not, the process moves to block 33 and Yes If so, proceed to block 36.

As described above, by controlling the drawing head 62, even if a line segment corresponding to a lead core of 3 mm or more is manually drawn by the controller 80, it is possible to prevent blurring in one drawing.

In addition, it was used above. pen down, pen up,
The terms ascending, descending, upper, lower, and raising and lowering are used with reference to one screen.

Therefore, the present invention is not limited to an X-Y plotter having four paper mounting surfaces horizontal to the floor surface and a print head disposed above the paper mounting surface, but The X-
The present invention can also be applied to a Y plotter, in this case pen down.

The terms pen-up, descent, or elevation.

It means moving away from or approaching the placement surface in a direction approximately perpendicular to the placement surface, and the terms "upper" and "lower" also refer to the placement surface or the drawing surface, and the one closest to the vertical direction of the drawing surface is the bottom, and the farthest one is the bottom. should be interpreted as the top.

〔effect〕

Since the present invention is configured as described above, it is possible to detect the state in which the lead is removed from the lead chuck.

This detection operation is performed only immediately after the upper tubular body is raised with a large stroke, and is not performed when the upper tube is raised with a small stroke, so that there is an effect that core missing can be detected efficiently.

[Brief explanation of the drawing]

Figure 1 is a flowchart, Figure 2 is a block circuit diagram, Figure 3 is a flowchart, Figure 4 is a flowchart, Figure 5 is a flowchart.
The figure is a sectional view, FIG. 6 is an external view, FIG. 7 is a side view, and FIG. 8 is a side view. 50...Machine body, 52...Paper mounting plate, 54
... Y rail, 56 ... paper, 58 ...
・X motor, 60...Y motor, 62...
- Line head. 64...Bonks, 66...Writing instrument stocker. 66a, 6Gb...Disk, 68...Pen holder, 70...Writing instrument, 72...Pen stopper. 74... Rotating arm, 76... Axis, 78...
...Pen holder, 80...Controller, 8
2...Central processing unit, 84...l) C motor. 86... Board, 88... Shaft body, 90...
・Pipe body. 90a...a-pulley, 90b...large gear. 92...a-tally encoder, 94°°°°
Small m wheel, 96...small gear, 98...guide shaft. 100... Elevating body, 102... Protruding piece, 10
4... Lobe pulley, 106... Lobe tension adjustment mechanism, 108... Screw, 1
10...wire rope, 112...screw,
114...Screw, 116...Motor drive circuit, 130...Support piece, 132...Lower tube body, 134...Upper tube body, 134a...
・Brim part 136...Chuck guide, 138・
... Guide tube, 140 ... Coil spring,
142...Pipe, 144...Coil spring, 146...Stopper ring,
148... Lifting pipe, 150... Lead core,
152.154... Core chuck. 156...Ball receiver is hole, 158...°゛°° steel ball 60...Opening/closing part, 162...Coil spring

Claims (1)

[Claims] (1) The core chuck 15 includes a lower tube body 132, an upper tube body 134 that is movable in the axial direction with respect to the lower tube body 132, and core chucks 152 and 154 built into the upper tube body 134.
2. When a force is applied to 154 to move upward relative to the upper tube body 134, the core chuck 152,
154 grips the core 150 inserted therein, and releases the gripping force when the gripping force is released, and the core 150 protruding from the lower tube body 132 is relatively free when the gripping force is released. The lower tube body 132 is returned by a short predetermined return amount.
The upper tube body 134 of the writing instrument is adapted to be returned to the inside of the writing instrument, and the upper tube body 134 is held in a pen holder 68 of the drawing head 62, and the lower tube body 132 is held in a fixed position in the drawing head 62, and the pen holder 68 while controlling the printing head 62 to move up and down relative to the paper.
X to send in the Y direction and draw a specified drawing on the paper
- In the Y plotter, after drawing one line, the core length corresponds to the descendable distance PO' of the core chucks 152, 154 with respect to the lower tube body 132 and the length of the line segment of the command for the next one line. is compared based on the output data of the encoder 92 that converts the position of the upper tube body 134 into an electrical signal, and when the lowering possible distance PO' is smaller than the line segment core length, the upper tube body 134 is After raising it to the highest position and setting the core chucks 152 and 154 to the highest position, the upper tubular body 134 is lowered to proceed to the drawing operation based on the next one-line segment command, and the lowering possible distance PO' is When the line segment core length is larger than the line segment core length, the upper tube body 134 is raised by a relatively short distance to bring the pen up, and then the drawing operation based on the next line segment command is started. , before proceeding to the drawing operation, determining whether the upper tube has just been raised to the highest position;
Only when the upper tube body 134 is raised to the highest position, the drawing surface 56 of the upper tube body 134 is moved from the highest position to the highest position.
The amount of descent until the core 150 comes into pressure contact with a is detected, and the relationship between this amount of descent and the amount of descent of the core 150 when the upper pipe body 134 is at its highest point is detected.
Data obtained by adding a predetermined value to the distance between the lower end and the drawing surface 56a are compared, and when the amount of descent is greater than the data, it is recognized that the lead 150 has come off from the lead chucks 152, 154. A coreless detection method characterized by: