JPH1035187A - Paper cutting device in automatic drawing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent paper from floating when the paper is cut and to cut finely the paper by means of a cutter. SOLUTION: After drawing on paper on a platen 2 pinched by a driving roller 6 and press rollers 10 and 12 is completed, a cutter 18 with a sheet-like blade 18a and with a cutting direction being parallel to the side face of the blade 18a is brought into contact with the paper on the platen 2 to cut the paper by moving the cutter 18 in the transverse direction of the paper. When the paper is cut, the direction of the side face of the blade 18a of the cutter 18 is inclined by a little angles to the opposite side to the side where the press rollers 10 and 12 pinching the paper are arranged and tensile force acts thereby on the paper cutting part to prevent the paper from floating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cutting device in an automatic drafting machine such as a pen type or ink jet type plotter / printer.

[0002]

2. Description of the Related Art A paper 20 on a platen 2 is sandwiched between a driving roller 6 and pressure rollers 10 and 12, and the paper 20 is cut in a width direction by a cutter 18 held by a drawing head. The apparatus is disclosed in JP-A-6-40195 and others.

[0003]

A double-blade type cutter as shown in FIG. 2 is used. The double-edged cutter 18
It has directionality in two directions parallel to the side surface of the plate-shaped blade edge 18a. In addition, there is a single-edged cutter, but the single-edged cutter has directionality only in one direction parallel to the side surface of the cutting edge. When a double-edged or single-edged cutter is used, the direction of the cutting edge, that is, the side surface of the cutting edge is set parallel to the cutting direction Y1 as shown in FIG. In this case, when the paper is cut, no tensile force is generated on the paper, so that a paper floating 20a or the like is generated between the cut portion of the paper 20 and the pressure rollers 10, 12, as shown in FIG. There was a problem that the department became dirty. An object of the present invention is to solve the above problems.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to provide a sheet-like sheet holding plate on a platen (2) between a driving roller (6) and pressure rollers (10) (12). A cutter (18) having a cutting edge (18a) having a cutting direction parallel to the side surface of the cutting edge (18a) is pressed against the sheet on the platen (2), and the cutter (18) is moved across the sheet. The cutting edge (18a) of the cutter (18) in an automatic drafting machine configured to cut paper by moving to
Is inclined at a slight angle α with respect to the moving direction of the cutter (18) to the side opposite to the side on which the pressure rollers (10) and (12) are arranged.

[0005]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a pen,
1 shows an outline of an automatic drafting machine such as an XY plotter using a pencil or a printer using an ink jet head, and a platen 2 forming a paper supporting surface is fixed to a main body. A drive shaft 4 is disposed below the platen 2, and a plurality of drive rollers 6 are fixed to the drive shaft 4 corresponding to the sheet width. Reference numeral 8 denotes a rail erected on the main body, on which a pair of pressure rollers 10,
The pressure rollers 10 and 12 are disposed immediately above the corresponding drive rollers 6.

[0006] A carrier 14 is movably mounted on the rail 8, and a drawing head 16 is mounted on one side of the carrier 14. On the other side of the carrier 14, a holder portion of a double-edged cutter 18 having a plate-shaped cutting edge 18a is supported via an elevating mechanism (not shown). At the time of drawing, the paper 20 on the platen 2 is sandwiched between both sides by the drive roller 6 and the pressure rollers 10 and 12, and the drive roller 6
Is sent in one axis (X-axis) direction by the rotation of. on the other hand,
The drawing head 16 is sent in two directions (Y-axis) along the rail 8, and the drawing data transferred from the host computer to the controller is transmitted to the sheet 20 by the drawing head 16.
It is drawn on. When the drawing is completed, the cut execution portion of the sheet 20 is sent below the moving path of the cutter 18.

The controller lowers the cutter 18 at a point S (see FIG. 1B) in front of one side of the paper 20 and abuts the tip of the cutter 18 on the cutter blade receiving surface of the platen 2 with a predetermined pressure. In this state, the carrier 14 is moved in a direction crossing the sheet 20, and the sheet 20 is cut by the cutter 18. The front end side 18 ′ of the cutting edge 18 a of the cutter 18 is
It is inclined at a slight angle α to the side opposite to the side on which the pressure rollers 10 and 12 are arranged with respect to the cutting direction. for that reason,
When cutting the paper 20, the friction between the cutting edge 18 a of the cutter 18 and the paper 20 generates a tensile force F at a cutting portion of the paper 20, which is separated from the pressure rollers 10 and 12 and is perpendicular to the cutting direction, The cut portion of the paper 20 is taut and the slack of the paper 20 on the platen 2 is removed. In the above embodiment, the cutter 18 is moved in one direction with respect to the paper 20 to cut the paper 20. As shown in FIG.
When cutting, the direction of the cutting edge 18a of the cutter 18 needs to be changed.

FIG. 6 shows a blade angle conversion mechanism, in which a motor 22 and a support frame 24 that are numerically controlled by a controller are fixed to the carrier 14. The rotating cylinder 26 is rotatably supported by the cylinder portion of the support frame 24 via a ball bearing so as not to be displaced in the axial direction. The rotary cylinder 26 is connected to an output shaft of the motor 22 via an endless timing belt 28. The holder 18b of the double-edged cutter 18 is fitted to the rotary cylinder 26 via the key 30 and the key groove 32 so as to be interlocked with the rotary cylinder 26 in the rotational direction and slidable in the axial direction. The holder portion 18b is urged in the ascending direction by a spring 34, and the upper flange portion 18c is engaged with an operation plate 36 connected to an output shaft of a solenoid (not shown).

The solenoid is fixed to the carrier 14. In the above-described configuration, when the output shaft of the motor 22 rotates under the control of the controller, the rotary cylinder 26 rotates, and if the cutting angle of the cutter 18 is set to the left in the cutting direction, as shown in FIG. If the cutting direction is the right direction, the angle is changed to the right rotation direction as shown in FIG. 5c. When the solenoid is driven and the operation plate 36 is lowered, the cutter 18 is pushed down against the elasticity of the spring 34, and the cutting edge is
Press against the cutter receiving surface of.

FIGS. 7 to 10 show another embodiment of the blade angle conversion mechanism. A rail 9 for guiding the cutter is provided on the main body separately from the rail 8, and a carrier 14 is movably attached to the rail 9. Reference numeral 38 denotes a support cylinder, which is fixed to the carrier 14. The cutter 1 is attached to the support cylinder 38.
The eight holder portions 18b are rotatably fitted and inserted, and are urged upward by a coil spring 40. Spring 40
Is fixed to the support cylinder 38, the other end 40b of the spring 40 is fixed to the holder portion 18b, and the returning force of the spring 40 causes the holder portion 18b to move the arm 42 fixed thereto to the rail 9. Urged in a vertical direction. An operating arm 44 is fixed at right angles to a lifting output shaft of a solenoid (not shown) built in the carrier 14, and one end of the operating arm 44 is in contact with an upper end of the cutter holder 18b.

A roller 46 is rotatably supported at the end of an arm 42 projecting perpendicularly to the holder portion 18b, and the roller 46 elastically contacts the side surface of the rail 8 by the return force of the spring 40. ing. An opening 48 for changing the direction of the cutter (the other is not shown) is formed near both ends of the side surface of the rail 8. When the sheet 20 is cut from A to B in FIG.
The blade 18a of the cutter 18 inclines in the clockwise direction with respect to the axis perpendicular to the side surface, and the direction of the cutting edge 18a of the cutter 18 is inclined with respect to the cutting direction Y1 in the direction opposite to the pressing rollers 10 and 12 by α.

In this state, the paper 20 is cut from A to B by the cutter 18. Further, the cutter 18 is connected to the rail 9
When the roller 46 moves in the arrow direction Y1 along the arrow, the roller 46 falls into the opening 48. At this time, the arm 42 is perpendicular to the side surface of the rail 9 as shown in FIG. Next, the controller moves the carrier 14 in the opposite direction Y2 and raises the cutter 18. When the roller 46 is disengaged from the opening 48 by the movement of the carrier 14 in the right direction Y2 in FIG. 9 and rides on the side surface of the rail 8, the arm 42 is moved counterclockwise in FIG.
Rotating against the zero force, the direction of the cutting edge 18a of the cutter 18 is
It tilts α degrees to the opposite side to 2.

[0013] The controller is such that the cutter 18 in FIG.
When the point A is reached, the cutter 18 is lowered and cut to the point C. The direction of the blade edge of the cutter 18 is changed by an opening (not shown) provided at the end of the rail 8 on an extension of the point C.

[0014]

As described above, according to the present invention, when a sheet is cut, a tensile force is applied to the sheet in a direction away from the holding portion, so that the floating of the sheet can be prevented and the sheet can be cut cleanly. There are effects that can be done.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of the present invention.

FIGS. 2A and 2B are explanatory views of a cutter, wherein FIG. 2A is a side view of a blade of the cutter, and FIG. 2B is a plan view of the blade of the cutter;

FIG. 3 is an explanatory diagram of the present invention.

FIG. 4 is an explanatory diagram of the present invention.

FIG. 5 is an explanatory diagram of the present invention.

FIG. 6 is an explanatory side view showing another embodiment of the present invention.

FIG. 7 is an explanatory side view showing another embodiment of the present invention.

FIG. 8 is an explanatory side view showing another embodiment of the present invention.

FIG. 9 is an operation explanatory view showing another embodiment of the present invention.

FIG. 10 is an explanatory side view showing another embodiment of the present invention.

FIG. 11 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 2 Platen 4 Drive shaft 6 Drive roller 8 Rail 10 Pressure roller 12 Pressure roller 14 Carrier 16 Drawing head 18 Cutter 18a Blade tip 18b Holder 18c Collar 20 Paper 22 Motor 24 Support frame 26 Rotating cylinder 28 Timing belt 30 Key 32 Key Groove 34 Spring 36 Working plate 38 Support cylinder 40 Spring 42 Arm 44 Working arm 46 Roller

Claims (1)

[Claims] 1. A sheet on a platen (2) is sandwiched between a driving roller (6) and pressure rollers (10) and (12), and has a plate-shaped cutting edge (18a). In an automatic drafting machine in which a cutter (18) having a cutting direction in a parallel direction is pressed against a sheet on a platen (2) and the cutter (18) is moved in a direction crossing the sheet to cut the sheet. The cutting edge (18a) of the cutter (18)
An automatic drafting machine characterized by inclining the side surface at a slight angle α with respect to the moving direction of the cutter (18) to the side opposite to the side on which the pressure rollers (10) and (12) are arranged. Paper cutting device.