JPH02117898A - Paper feeder for paper driving type drafting machine - Google Patents

Abstract

PURPOSE:To enable secure feeding of a paper by setting a gripping force for the paper according to paper data such as the kind of the paper, and varying the gripping force into an optimum condition according to movements of the paper, with the set gripping force used as a reference. CONSTITUTION:Optimal maximum gripping forces for papers according to the kind (e.g., thickness) and the size of the paper, namely, maximum pressing force data MAX is preliminarily stored, in a tabulated form, in a memory 60 of a controller. When a drawing operation is started, the controller judges whether online data is present. When the online data is present, the controller judges whether the data is paper kind and size instructions. When the data is the paper kind and size instructions, the controller draws all data received before a speed specification instruction. Thereafter, the controller detects the current position of a middle point M of the paper relative to a driving roller 6, and drives a motor 48 according to the paper kind and size instructions while detecting the current position, whereby drawing is performed with a paper pressing force varied between the maximum pressing force MAX and a minimum pressing force MIN preliminarily set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device used in a paper-driven automatic drafting machine or the like.

[Conventional technology]

This type of paper feeding device is shown in Japanese Utility Model Application Publication No. 128092/1983.

In this conventional device, as shown in FIG.
The pressure roller 80 is pressed counterclockwise around the drive roller 88 and the paper 9 is pressed between the rollers 80 and 88.
Holding 0.

[Problem that the invention seeks to solve]

In the conventional apparatus described above, the gripping force of the pressure roller 80 and the drive roller 88 on the paper 90 due to the elasticity of the spring 86 is constant, and therefore the grip may be too strong or too weak depending on the type or size of the paper. Furthermore, depending on the distance between the center point of the paper and the drive roller 88, the gripping force may be too strong or too weak, making it impossible to smoothly feed the paper. 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 pressure roller that is pressed into contact with a drive roller, and a sheet of paper sandwiched between the drive roller and the pressure roller that is sent in a predetermined direction by rotation of the drive roller under the control of a controller. In the paper-driven automatic drafting machine that controls the movement of a pen head in a direction across the paper to draw a drawing on the paper, a pressure adjustment means for changing the pressure force of the pressure roller against the drive roller is provided, and the controller , a memory storing pressure force data corresponding to the paper type and/or size, and a pressure force selection means for selecting the pressure force data corresponding to the paper type and/or size data based on the paper type and/or size data. ,
The apparatus comprises a means for detecting the midpoint of the paper, and a pressing force setting means for setting the pressing force of the pressing force adjusting means based on the distance data of the midpoint with respect to the driving roller and the pressing force data. be.

[Effect]

In the above configuration, when paper type and/or size data is input to the controller, the pressure force data most suitable for the paper is selected, and based on this pressure force data and the distance data of the midpoint of the paper to the drive roller, The pressure of the pressure roller against the drive roller is set to an optimal value. As a result, the grip force of the paper by both rollers is set to an appropriate value, and the paper is accurately fed in a predetermined direction by the rotation of the drive roller.

〔Example〕

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

Reference numeral 2 denotes a paper mounting member fixed to the body 4 of the automatic drafting machine, and a drive roller 6 connected to the output side of the X motor 5 is rotatably arranged below a slot formed in this member. .

8 is a drawing roller rotatably supported by the machine body 4;
The rollers 8 are arranged parallel to the driving roller 6, and the elongated directions of these rollers 6.8 are set at right angles to the feeding direction of the paper 10. The drawing roller 8 is connected to the drive roller 6 via a transmission mechanism so as to rotate in the same direction at a circumferential speed that is the same as or slightly faster than the circumferential speed of the drive roller 6. , 11 is the Y rail,
A Y cursor 1 is disposed between the pair of boxes of the machine body 4 at right angles to the feeding direction of the paper 10.
2 is attached movably along the Y rail 11. A pen head 14 is fixed to the Y cursor 12, and a writing instrument 18 is removably attached to a pen holder 16 provided on the pen head 14. The pen holder 16 is connected to the output side of an elevating drive device consisting of a moving coil 15 built into the pen head 14.

Reference numeral 2o denotes a guide rail, which is disposed diagonally above and parallel to the drive roller 6. A bracket 2 is attached to the guide rail 20 so as to be slidable along the guide rail 20.
2 is installed. Reference numeral 24 designates a swinging arm, the intermediate portion of which is rotatably supported by a shaft 26 on the machine base 4 about an axis parallel to the drive roller 6.
A pressure roller 28 is supported on a shaft 30 at the tip thereof so as to be rotatable about an axis parallel to the drive roller 6. The pressure roller attachment of the arm 24 is located between the end opposite to the side and the rotation center of the arm 24, and the swing arm 24 has a shaft 32 that rotates in a right angle direction. The shaft body 32 is freely supported, and is loosely fitted into a hole formed in the projecting piece of the bracket 22. A molding 34 and a rotation stopper nut 36 fixed to the molding 34 are screwed into the threaded portion formed on the shaft body 32, and are located between the lower surface of the molding 34 and the upper surface of the protruding piece of the bracket 22. The shaft body 32
A coil spring 38 inserted into the coil spring 38 is compressed. 4
Reference numeral 0 designates a guide tube that is installed upright on the upper surface of the projecting piece of the bracket 22, and slide grooves 42 of a predetermined width are bored in the axial direction on both sides of the inner wall surface of the guide tube, into which the nut 36 is inserted.
Projecting pieces protruding from both sides are slidably fitted in the axial direction. Reference numeral 44 denotes a stopper fixed to the upper end of the guide tube 40, and a reference position inspection sensor 46 consisting of a limit switch is disposed on this stopper so as to be positioned on the upward locus of the nut 36 along the groove 42. There is. 48 is a stepping motor fixed to the body 4 of the automatic drafting machine via a bracket, and a gear 50 is fixed to the output shaft of this stepping motor.
It meshes with 2. Reference numeral 54 denotes a pressure roller vertical cam, which is rotatably disposed at a fixed position on the upper surface of one end of the swing arm 24 by operating a lever (not shown) or by a drive device (not shown). The stepping motor 48 is connected to a controller built in the body 4 of the automatic drafting machine, and the controller includes an operation panel 56.
It is configured to be connectable to a host computer 58 via an interface. Memory 6 of the controller
As shown in FIG. 6, in 0, the optimum maximum grip force of paper, that is, maximum pressing force data MAX corresponding to the type and size such as paper thickness, is stored in advance in a table form.

The input shaft of a pulse encoder 62 is connected to the output shaft of the stepping motor 48.
The pulse output terminal of is connected to a pulse counter 66 which is connected to a difference detection comparator 64.

The stepping motor 48, the shaft body 32, and the guide tube 40
, Mall 34, Natsu 36. The bracket 22 and the swing arm 24 constitute a pressurizing force adjusting means. Reference numeral 92 denotes a known optical object inspection sensor provided on the paper stacking member 2, and is for detecting the edge of the paper 10 on the paper stacking neck member 2.

The Y cursor 12 is configured to be driven along the Y rail 11 by a Y motor 94. The moving coil 15. The XY motor 5.94 is connected to the central processing unit 100 via drivers 96 and 98, as shown in FIG. The moving coil 1
The vertical position on the output side of the motor 5 is fed back to the central processing unit 100 by the encoder 102, and the amount of rotation on the output side of the X and Y motors 5.
4.106 and counters 108, 110 to be fed back to the central processing unit 100. The central processing unit 100 is connected to an operation panel 56 and a host computer 58 via an interface 112.

Next, the operation of this embodiment will be explained.

Due to the elastic force of the coil spring 38, the shaft body 32 is urged upward in FIG. 1 via the molding 34.

This urging force urges the swinging arm 24 in a counterclockwise direction about the shaft 26, and the pressure roller 28 is in elastic contact with the drive roller 6. When the cam 54 is rotated by a drive device or a lever operation and its eccentric enlarged portion presses one end of the swing arm 24 downward, the swing arm 24 swings clockwise about the shaft 26, and the pressure roller 28 is separated from the drive roller 4 for a predetermined period. In this state, the paper 1o is placed on the paper placement member 2. Next, when the cam 54 is rotated in the pressing force release direction to release the pressing force of the cam 54 against the arm 24, the arm 24 swings counterclockwise about the shaft 26 due to the elastic force of the coil spring 38. , the pressure roller 28 comes into elastic contact with the drive roller 6 from above the paper 10. When the drive roller 6 is driven in six forward and reverse rotations, the paper 10 is moved from side to side in the left and right direction in FIG.
move along the top surface. Rotating the shaft body 32 and molding 3
When the roller 4 is lowered, the coil 38 is compressed and the repulsive force increases, and the pressure of the pressure roller 28 against the drive roller, that is, the grip force of the paper increases. On the other hand, when the shaft body 32 is reversely rotated to raise the molding 34, the length of the coil spring 38 is increased and the repulsive force is reduced, causing the pressure roller 28 and the drive roller 6 to
The grip force of the paper 10 due to this decreases.

Next, the automatic adjustment operation of the grip force will be explained with reference to the flowchart shown in FIG.

First, after setting the paper 1o in the automatic drafting machine, the operator selects the type of paper 1o from the type data such as tracing paper, Kent paper, film, coated paper, etc. from the operation panel 56. Specify the data by type, and specify the paper size (block 1). Next, the central processing unit 10 of the controller
0 first drives the X motor 5 based on a program stored in the memory 114 to cause the end of the paper 10 to pass over the sensor 92, and the sensor 92 detects the end of the paper 10. The central processing unit 100 receives the size data L of the paper 10, the amount of rotation of the X motor 5, and the drive roller 6 sensor 92.
From the distance between them and the paper 1o end detection signal of the sensor 92,
Calculate the midpoint M of the paper 10 shown in FIG.
calculate the distance to the drive roller 6 (block 2
).

Then, the central processing unit 100 calculates the midpoint M of the paper 10.
The data on the distance to the drive roller 6 is input to the pressing force setting means 69. The pressing force setting means 69 sets the minimum pressing force MIN when the midpoint M of the paper 10 is located on the drive roller 6, and sets the minimum pressing force MIN when the midpoint M of the paper 10 is located on the drive roller 6, and sets the minimum pressing force MIN when the midpoint M of the paper 10 is located on the drive roller 6, and sets the minimum pressure force when the paper 10
The position moved a predetermined distance in the X) direction is defined as the maximum pressing force MAX, and between the minimum pressing force MIN and the maximum pressing force MAX, the pressing force data P changes as the paper 10 moves, as shown in FIG. is output to the rotation speed setting means 74.

On the other hand, when the type and size of paper to be used is specified on the operation panel 56, the controller operates the motor driver 7.
2, the stepping motor 48 is driven to raise the molding 34, and the upper surface of the nut 36 is connected to the sensor 4.
6 is detected, the driving of the stepping motor 48 is stopped, the molding 34 is set to the reference position, and the counter 6° is reset to zero. In FIG. 8, the 1 rotation speed setting means 74 transfers the pressurizing force data to the stepping motor 48.
This rotation speed data is input to the difference detection comparator 64. Difference detection comparator 6
4 outputs the difference between this rotation speed data and the rotation speed data from the counter 66, and the motor driver 72 drives the stepping motor 48 based on this difference output.

By driving this stepping motor 48, the molding 34
moves down along the shaft 32, compressing the coil spring 38 and increasing the paper grip force. The rotational movement of the output shaft of the stepping motor 48 is converted into a pulse signal by a pulse encoder 62, and this pulse is sent to a counter 66.
The pulse count value of the counter 66 is fed to the difference detection comparator 64 as rotation speed data, and when the fed-back rotation speed data matches the rotation speed data output from the rotation speed setting means 74, When the stepping motor 4 stops driving, the gripping force on the paper 10 is determined by the maximum pressing force MAX determined by the type and size of the paper, and the minimum pressing force when the midpoint M of the paper is located directly above the drive roller 6. MIN and changes depending on the movement position of the midpoint M of the paper 10 (block 3).

Next, the controller analyzes the online data from the host computer 58 to create drawing data (block 4), and based on this drawing data, controls the rotation of the drive roller 6 and the movement of the pen head 14 along the Y rail 11. and controls the up/down of the pen holder 16 to hold the paper 1.
0 (block 5).

During this drawing, the controller calculates the distance between the midpoint M of the paper 10 and the drive roller 6, controls the motor 48 according to the calculation result, and variably controls the pressing force on the paper 10 in accordance with the movement of the paper 10. Block 6).

Next, operations based on online commands will be described with reference to the flowchart shown in FIG.

When drawing starts, the controller judges whether there is online data in judgment block 1, and if there is,
The controller determines whether the data is a paper type and size command (block 2). If Yes,
The controller prints all the data received before the speed designation command (block 3), and after printing all of this data (block 4), detects the current position of the midpoint M of the paper relative to the drive roller 6 (block 5). ), while detecting this current position, according to the paper type and size instructions,
Drive the motor 48 to apply the preset maximum pressing force M.
Drawing is executed while changing the paper pressure between AX and the minimum pressure MIN (block 6). Judgment block 7
Confirm that drawing is complete with , and finish drawing.

[Effects] The present invention sets the grip force of the paper based on paper data such as the type of paper, and uses this grip force as a reference.
Since the gripping force is changed to the optimum state according to the movement of the paper, there is an effect that the paper can be fed reliably.

[Brief explanation of the drawing]

Figure 1 is a side view, Figure 2 is an external view, Figure 3 is a flowchart, Figure 4 is a flowchart, Figure 5 is an explanatory diagram, Figure 6 is an explanatory diagram.
The figures are graphs showing the relationship between the pressure force and the feeding direction of the paper, where a shows the one for paper with no strength, b shows the one for the paper with strength, FIG. 7 is an explanatory diagram, and FIG. 8 The figure is a block explanatory diagram, and FIG. 9 is a side view of the conventional device. 2... Paper placement member, 4... Machine body, 6... Drive roller, 8... Drawing roller, 11... Y rail, 12
...Y cursor, 14...pen head, 16...
Pen holder, 20... Guide rail, 22... Bracket, 24... Swing arm, 26... Axis, 28...
...Pressure roller, 30...shaft, 32...shaft body, 34
...Mall, 36...Nut, 38...Coil spring, 40...Guide tube, 42...Groove, 44...Stopper, 46...Sensor, 48...Stepping motor, 50...Gear, 56...Operation panel. 60...Memory, 62...Pulse encoder, 64
...Comparator, 66...Counter, 8o...
Pressure roller, 82... Swing arm, 84... Shaft, 8
6...Tension spring, 78...Drive roller, 92...
Sensor patent applicant: Muto Kogyo Co., Ltd. Representative Patent Attorney: M. Nishijima Figure 2 Figure 4

Claims (1)

[Claims] (1) A pressure roller is pressed into contact with a drive roller, and the paper held between the drive roller and the pressure roller is sent in a predetermined direction by rotation of the drive roller under the control of a controller, while the pen head is moved in a direction across the paper. A paper-driven automatic drafting machine that draws a drawing on a paper by controlling the movement thereof, is provided with a pressure adjustment means for changing the pressure of the pressure roller against the drive roller, and the controller is configured to adjust the type and/or size of the paper. a memory storing pressing force data corresponding to the paper; a pressing force selecting means for selecting the pressing force data corresponding to the data based on the paper type and/or size data; A paper feeding device comprising a detecting means and a pressure setting means for setting a pressure of the pressure force adjusting means based on distance data of the midpoint with respect to the drive roller and the pressure force data.