Abstract:
An automated plotting apparatus has a carriage assembly for positioning an axially elongated pen relative to a plotting sheet supported on a plotting surface in response to command signals received from a controller. A solenoid assembly coaxially surrounds an associated portion of the pen and moves it axially into marking engagement with the sheet. Marking fluid is supplied to the pen from a pressurized reservoir. Pinions driven by a motor mounted in stationary position relative to the plotting surface engage racks mounted on the carriage assembly to move the carriage assembly relative to the plotting surface.
Abstract:
An automatically controlled cutting machine for cutting sheet material employs a cutting wheel and a hard, smooth and continuous surface on which the sheet material is spread for cutting. To prevent shifting during cutting, the material is releasably attached to the support surface by adhesives, freezing, electrostatics and other securing means. The cutting wheel is forced downwardly against the hard support surface by a number of means to insure severing of the sheet material and may be ultrasonically vibrated to facilitate the severing process.
Abstract:
A method and apparatus for cutting multi-ply layups of limp sheet material employs an automatically controlled machine with a knife blade and a controller for guiding the blade along cutting paths defined by a marker of pattern pieces. The marker contains a plurality of pattern pieces in a closely packed array which causes the pattern pieces and segments of the cutting paths to be in contact or in close proximity to one another, and makes accurate cutting difficult or impossible. Digitized data defining a cutting program for the marker is preprocessed in a data processor to identify critical segments of cutting paths where cutting difficulties may arise and introduces into the data remedial command signals that guide the cutting blade past the identified critical segments for more accurate cutting.
Abstract:
A method for cutting sheet material utilizes a closed loop automatically controlled cutting machine having a reciprocating cutting blade as the cutting tool. Sheet material to be cut is spread in multiple plies to form a layup, and the cutting blade and the material are then moved relative to one another in cutting engagement along predefined lines of cut. During cutting, a sensor detects a cutting parameter that is affected by the interaction of the cutting blade and sheet material, and signals provided by the sensor are fed back in the closed loop automatic control mechanism to adjust or initiate further steps in the cutting operation. Such adjustment or initiation alters the cutting machine operation for cutting conditions in real time in order to improve the overall performance of the machine.
Abstract:
An apparatus having a table defining a work surface, and a carriage mounted for movement over the work surface in one direction includes a device for precisely indexing a strip of sheet material in the same direction so that various sections of the strip can be operated upon by an instrument mounted on the carriage. The indexing device comprises a bar that is parked at one edge of the work surface while the instrument and carriage are working on one section of the sheet material. The bar is subsequently attached to the carriage above the sheet material for an indexing operation. A plurality of magnets are mounted in the bar and cooperate with a clamping plate placed under the bar and the sheet material to clamp the sheet material between the plate and the bar during an indexing operation. After the indexing operation, the clamping plate and bar are returned to the parking position at one edge of the work surface and the bar is detached from the instrument carriage.
Abstract:
In a method and apparatus for cutting parts from hides from different shapes and sizes a digitizer and a cutter are provided which make it possible to digitize a hide at one time on the digitizer and to then cut it at a later time on the cutter with the hide when spread on the supporting surface of the cutter being given a shape and location exactly corresponding to its shape and location on the supporting surface of the digitizer. Therefore, the digitized representation of each hide may be used to create an efficient cuting marker for the hide which marker can then be used to cut the hide on the cutter without producing rejects or other cutting errors due to the location and shape of the hide on the supporting surface of the cutter not agreeing with those of the hide on the supporting surface of the digitizer. This arrangement allows keeping a large number of digitized hides in inventory and selecting from this inventory those hides which can be used most efficiently to produce the parts required to fill a given parts request.
Abstract:
In a reciprocating blade for cutting sheet material, a lower cutting part includes a forward cutting edge defining portion and a rear body portion. The body portion has two parallel side faces. The cutting portion has first, second, third and fourth side surfaces. The first side surface is located in a reference plane parallel to and mid-way between the side faces of the body portion. The fourth side surface is in the same plane as one of the side faces of the body portion. The second side surface is inclined to the reference plane, extends between one side face of the body portion and the first side surface, and intersects the first side surface to define the cutting edge. The third side surface is inclined to the reference plane and extends from the rear of the first side surface to the other side face of the body portion. At least the first side surface is covered with a layer of hard material. During use of the blade the second side surface is periodically sharpened. As a result of this construction and method of use the cutting edge is provided by the hard material, the cutting edge remains on the middle reference plane throughout the service life of the blade, and the lateral forces imposed on the blade by the cut material are substantially balanced throughout the service life of the blade.
Abstract:
In a reciprocating blade for cutting sheet material, a lower cutting part includes a forward cutting edge defining portion and a rear body portion. The body portion has two parallel side faces. The cutting portion has first, second, third and fourth side surfaces. The first side surface is located in a reference plane parallel to and mid-way between the side faces of the body portion. The fourth side surface is in the same plane as one of the side faces of the body portion. The second side surface is inclined to the reference plane, extends between one side face of the body portion and the first side surface, and intersects the first side surface to define the cutting edge. The third side surface is inclined to the reference plane and extends from the rear of the first side surface to the other side face of the body portion. At least the first side surface is covered with a layer of hard material. During use of the blade the second side surface is periodically sharpened. As a result of this construction and method of use the cutting edge is provided by the hard material, the cutting edge remains on the middle reference plane throughout the service life of the blade, and the lateral forces imposed on the blade by the cut material are substantially balanced throughout the service life of the blade.
Abstract:
An X,Y plotter for drawing drawings of great length has a plotting area over which paper is moved in one direction parallel to the length of the paper and drawing to be produced. A pen is moved in X and Y coordinate directions relative to the plotting area, by X and Y carriages, to draw on the portion of the paper currently at the plotting area. The elongated one of the two carriages extends parallel to the length of the paper and is supported at its opposite ends by two stationary guide rails extending across the width of the paper and spaced by less than the width of the paper to allow the carriages to be made of small size and light weight. Associated means for providing precise tracking and advancement of the paper are also described.
Abstract:
A cutter in which a reciprocating knife is driven by an eccentric mechanism. The knife has a drive portion that flexes laterally in a plane perpendicular to the drive axis of the eccentric mechanism. The eccentric drive axis is offset along the perpendicular plane away from the axis on which the knife reciprocates. The offset of the eccentric drive axis allows the flexible drive portion to be kept straighter during the downstroke than in previous cutters. The increased straightening provides greater columnar strength and reduces deflection and stress of the drive portion during the time the knife is in compression. During the upstroke the knife is bent to a greater degree than in the previous cutters, but during this time the knife is in tension, the tension forces opposing rather than aiding the bending. The offset therefore provides for a longer service life for a blade of equal size or allows a reduction in size and mass of the knife to maintain an equivalent service life.