KR960031087A - Floating head cutting plotter and its control method - Google Patents

Abstract

An X-Y cutting plotter for vinyl or other sheet materials uses a cut chart carried by the cutting head on the push rail.

The cutting head carries a rotary solenoid in which the output shaft rotates the eccentric pin and bearing. The eccentric pin and its bearing are placed in the horizontal grooves of the cam follower. The cam follower is fixed to zero tolerant bearing and carries the cutting tool.

The cut position of the cam follower and the eccentric pin are selected so as to minimize the total time ratio of the change of the downward force on the cutoff and the downward force is kept constant despite the angular displacement of the eccentric pin or the total output torque of the rotary solenoid .

The current to the rotary solenoid is monitored and remains constant despite the impedance changes that occur in the solenoid, such as the result of temperature changes.

The one or more material handling rollers are installed at an extension distance from the front and back of the platen against the center of the sheet in the polator with respect to the cutting band and the friction roller and contribute to maintaining the sheet in contact with the platen, So as to flatten the sheet.

Description

Floating head cutting plotter and its control method

Since this is a trivial issue, I did not include the contents of the text.

FIG. 1 is a perspective view of a cutting plotter according to the present invention; FIG.

FIG. 2 is a schematic cross-sectional view of the plotter of FIG. 1, taken along line 2-2 of FIG.

FIG. 3 is an exploded perspective view of the combined fastening rail enlarged by a front perspective view of the cutter head and other parts of the plotter; FIG.

4 is a perspective view showing an enlarged rear view of the cutter head and other parts of the plotter in which the coupling stationary rail is separated and a portion of the electrical coupling member seen in the cut-out state;

FIG. 5 is a block diagram of an electrical drive element of the cutter head. FIG.

Claims (20)

A plotter for making a computer controlled shape on a sheet, the tool for forming the shape on the sheet comprises means for applying a downward force on the tool for pressing and a substantially constant downward force regardless of the vertical displacement of the tool Wherein the tool acts as a floating head or the like for cutting the sheet to a constant depth irrespective of any incomplete vertical level of the sheet as described above with respect to the tool. The floating head cutting plotter of claim 1, wherein the means for downward force applied to the knife is a rotary solenoid. [3] The apparatus as claimed in claim 2, wherein the means for maintaining the downward force is an eccentric pin rotatably driven by a hammer having a groove in which the solenoid and the pin are disposed, and the hammer is connected to the tool for vertical movement A floating head cutting plotter. 4. The floating head cutting plotter of claim 3, wherein the angle of the eccentric pin is selected to be at an angular position with respect to the solenoid so that the ratio of change of the downward force is minimized by the eccentric pin when the solenoid rotates the eccentric pin. 3. The solenoid as claimed in claim 2, wherein the current source supplying the dynamic current to the rotary solenoid is a solenoid having a means for supplying a surveillance current to the solenoid by a current source and a solenoid for supplying current to the solenoid in a substantially uniform manner And a means for controlling the current. 6. The method of claim 5, wherein the monitoring means is an A / D converter connected to a current source, wherein the means for substantially homogenizing and maintaining the current is a logic circuit coupled to an A / D converter for supplying a control signal to the current source. Head cutting plotter. 7. The floating head cutting plotter according to claim 6, wherein the control signal provided by the logic circuit controls the solenoid to be a selectively controlled pulse width modulation current supplied by a current source. 2. The floating head cutting plotter of claim 1, comprising a material handling roller that extends from the plotter to catch it flat at a location extending from the plotter while being cut by the tool. 9. The floating head cutting plotter of claim 8, wherein the material handling roller keeps the sheet centered within the plotter. 9. The floating head cutting plotter of claim 8, wherein the material handling roller contributes to flatten the sheet being moved in and out of the plotter. 9. The floating head cutting plotter of claim 8, wherein the plotter is positioned at a predetermined height above the floor, and the material handling roller contributes to keeping the sheet from contacting the floor. 9. The floating head cutting plotter of claim 8, wherein the opposing material handling rollers are disposed at a position extending away from the plotter, and the sheet is arranged to move in and out of the plotter at the side of the plotter having opposing material handling rollers. 4. The floating head cutting plotter according to claim 3, wherein the material handling roller is in a position extended from the plotter to flatten the sheet away from the plotter while being cut by the cutting plane. 14. The floating head cutting plotter according to claim 13, wherein the opposing material handling rollers are disposed at a position extending away from the plotter, and the sheet is arranged to move in and out of the floater on the side of the floater, . 2. The apparatus of claim 1, wherein at least two pinch roller assemblies each have a pinch roller, the assembly being resiliently loaded to selectively urge the pinch roller against the sheet, the pinch roller being selectively Wherein the sheet is formed with an inclined surface to provide tension toward the sheet between the two pinch rollers when the pressing is performed. 16. The floating head cutting plotter according to claim 15, wherein said means for optical positioning of the pinch roller assembly with respect to said tool. The tool according to claim 1, wherein the tool comprises an adjustable cap passing through a position in which the tool is disposed, the cap being movable in the Z direction to provide a physical cut depth setting for the depth of the tool exposed and useful for cutting And the movable head is adjustable to the second position. Applying a downward force on the cutting planes touching the sheet to define the depth of the cutting; The knife for cutting the sheet is moved in accordance with the control by the computer in order to maintain the downward force in a substantially constant cutting degree even though the relative vertical distance between the sheet and the tool holder holding the knife on the sheet changes, Is achieved without a precise cutting plotter. ≪ RTI ID = 0.0 > 31. < / RTI > 19. The apparatus of claim 18, further comprising: a driven knife having a rotary solenoid vertically moving up and down by an eccentric pin disposed in a horizontal cam waveguide groove to maintain the force to which the downward force is applied to be substantially the same, Wherein the cutting position of the selected knife is set at an angular displacement of the eccentric pin such that the change time ratio of the knife and the downward force is minimized. The floating head according to claim 19, characterized in that current control is performed such that current is supplied to the rotary solenoid by a current source and a substantially constant current is maintained in the rotary solenoid in spite of a change in impedance, Plotter control method. ※ Note: It is disclosed by the contents of the first application.