675results about "Digital differential analysers" patented technology

One or more actuator driven devices on a sheet forming machine receive power and engage in bi-didrectional communications with one or more quality control systems either by having no physically connected cables to transmit the power to the actuators and no physically connected cables used for the bi-directional communications; or contactless power and communication on a power cable; or a cable connected from the power source to the actuators to provide both power and bi-directional communications; or power is provided to the actuators by a cable and the bi-directional communications are wireless.

This invention pertains to processing continuous webs such as paper, film, composites, and the like, in dynamic continuous processing operations. More particularly, it relates to controlling tension in such continuous webs during the processing operation. Tension is controlled in a dancer control system by connecting a corresponding dancer roll to an actuator apparatus or the like, sensing variables such as position, tension, velocity, and acceleration parameters related to the web and the dancer roll, and providing active force commands, in response to the sensed variables, to cause translational movement, generally including a target acceleration, in the dancer roll to control tension disturbances in the web. In some applications of the invention, the dancer control system is used to attenuate tension disturbances. In other applications of the invention, the dancer control system is used to create tension disturbances.

A method of creating three-dimensional products customized with user-selected images is described. The method includes storing definitions of products comprising components, receiving indication of selection by a user of a product, receiving indication of selection by a user of at least one image for printing on the product, receiving information regarding placement of the selected image on components of the product, preparing a two-dimensional representation of the components of the product with the image arranged thereon, and causing the printing of the two-dimensional representation on a material.

Methods and apparatus for improved current-to-voltage integrators reducing charge injection and kT/C errors from capacitor switching and intrinsic operational amplifier noise (i.e., offset, 1/f noise, thermal noise) during the reset cycle of the integrator, simultaneously reducing demands on the reference voltage source, using correlated double sampling to compensate for DC offset and low frequency op-amp noises, and “fake” integration and a capacitor divider to eliminate or significantly reduce kT/C noise and charge injection.

This invention pertains to processing continuous webs such as paper, film, composites, and the like, in dynamic continuous processing operations. More particularly, it relates to accumulating limited lengths of such continuous webs and to controlling tension in such continuous webs during the processing operation. Both tension control and limited accumulations are achieved in a festoon system by connecting a corresponding festoon to actuator or the like, sensing variables such as position, tension, velocity, and acceleration parameters related to the web and the festoon, and providing active force commands, in response to the sensed variables, to cause translational movement, generally including a target acceleration, in the upper festoon rolls to control tension disturbances in the web while providing limited accumulation of a length of the web. In some applications of the invention, the festoon control system is used to attenuate tension disturbances. In other applications of the invention, the festoon control system is used to create controlled tension disturbances.

An apparatus and method for receiving high-speed signals having a wide common-mode range with low input-to-output latency. In one embodiment, the receiver includes an integrator to accumulate charge in accordance with an input signal during an integration time interval to produce an output voltage. A sense amplifier samples and converts the output voltage of the integrator to a logic signal; and a latch stores the logic signal. In an alternate embodiment, a preamplifier conditions the input signal prior to being integrated. In another embodiment using multiple receivers, circuitry is added to the receiver to compensate for timing errors associated with the distribution of the timing signals. In yet another embodiment, the integrator is coupled to an equalization circuit that compensates for intersymbol interference. In another embodiment, another circuit compensates for accumulated voltage offset errors in the integrator.

A three dimensional object creation system that prints objects layer by layer, the system including a plurality of printheads, the system printing at least part of each of multiple layers simultaneously.

An image-based measurement technique that directly measures the orientation of fibers in a moving web that comprises nonwoven material measures the orientation angles of the individual fibers so that a more robust estimate of the statistical distribution of fibers is obtained. The technique includes the steps of: (a) illuminating an area on at least one side of the web with radiation; (b) obtaining at least one digital image of the illuminated area; and (c) calculating the fiber orientation of the web by processing the at least one digital image with a gradient operator thereby analyzing the distribution of observed fiber orientation angles within the image. The gradient operator is preferably of a non-integer order between ⅓ and ⅔ and particularly between ¼ and ¾. The use of fractional-gradient operators yields more reliable results than when integer order gradients are employed.

A capacitance to frequency converter includes a switching capacitor circuit, a charge dissipation circuit, a comparator, and a signal generator. The switching capacitor circuit charges a sensing capacitor and transfers charge from the sensing capacitor to a circuit node of the charge dissipation circuit. The comparator is coupled to the charge dissipation circuit to compare a potential at the circuit node to a reference voltage. The signal generator is coupled to an output of the comparator and to the charge dissipation circuit. The signal generator is responsive to the output of the comparator to generate a signal fed back to control the charge dissipation circuit. A frequency of the signal is proportional to a capacitance of the sensing capacitor.

A printing and embroidering system having a positional data appending system that is adapted to append positional data indicating positions of a first image and a second image with respect to each other to first image data representing the first image to be formed by one of printing and embroidering and second image data representing the second image to be formed by the other one of printing and embroidering, a first image forming unit with a first fabric holding member, which is adapted to form the first image based on the first image data on a fabric being held by the first fabric holding member, and a second image forming unit with a second fabric holding member, which is adapted to form the second image based on the fabric being held by the second fabric holding member, wherein the first image forming unit is provided with a mark forming system, which is adapted to form a predetermined mark represented by the positional data on the fabric, and wherein the second image forming system is provided with a misalignment eliciting system, which is adapted to elicit a misalignment between a position of the predetermined mark formed on the fabric held by the second fabric holding member and a position represented by the positional data appended to the second image data prior to forming the second image.