# US 5,699,837 A · Combined pile feeder control system and pile warp let-off motion for pile weaving machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,699,837 A - Document ID: US5699837A - Status: Granted - Kind: A - Application number: 08/647,050 - Filed: 1996-05-09 - Granted: 1997-12-23 - Earliest claimed: 1995-05-11 - Assignees: N.V. Michel Van de Wiele - Inventors: Hans Desmet - Web page: https://patentgrep.com/patent/US5699837A ## CPC - D03D 49/04: Control of the tension in warp or cloth - D03D 39/16: Double-plush looms, i.e. for weaving two pile fabrics face-to-face - D03D 51/005: {Independent drive motors (independent frame drives for dobbies D03C1/146, for other shedding mechanisms D03C13/02)} - D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS ## Abstract In a double-gripper weaving machine, intended for weaving plain velvet and carpets, a pile feeder and a combined pile warp beam let-off motion are equipped with a computer in order to calculate the necessary pile warp feed of each operating cycle of the weaving machine and use said calculation as a reference value, both functions pile feeder and pile warp beam let-off motion, being performed directly. The pile warp beam let-off motion has a regulating system consisting of a multi-axis control system provided for one or more pile warp beams. ## Claims ### Claim 1 A pile feeder control system and pile warp let-off motion for a face-to-face weaving machine, for weaving plain velvet and carpets, comprising a pile feeder and a pile warp beam let-off motion equipped with a computer suitable for calculating the necessary pile warp feed rate for each operating cycle of the weaving machine and using said calculation as a reference value, wherein a computer-controlled or a direct pile beam drive directly controls operation of both the pile feeder and pile warp beam let-off motion together, and wherein the pile warp beam let-off motion comprises a regulating system consisting of a multi-axis control system provided for one or more pile warp beams. ### Claim 2 (depends on 1) The system of claim 1, wherein the pile warp beam let-off motion comprises an axis constituting a 1/1 synchronism reference from the weaving machine. ### Claim 3 (depends on 1) The system of claim 1, wherein each beam comprises an axis for measuring the pile warp feed rate. ### Claim 4 (depends on 1) The system of claim 1, wherein the regulating system comprises the following regulating circuits: a speed regulating circuit between a servo drive and a servomotor; a high-speed regulating circuit between a regulator and a motor, in order to be able to control the desired motor speed, measured by means of a resolver on the motor and taking into account the reduction ratio and the current beam diameter, as a function of a desired pile feed rate and the current speed of the machine as measured by means of a resolver on the machine; and a low-speed regulating circuit between the regulator and the motor for adopting the desired motor speed as a function of a slowly changing beam diameter, and a measuring wheel, with an encoder, fitted on the pile beam so that the current pile feed rate can be measured. ### Claim 5 (depends on 1) The system of claim 1, wherein ground warp let-off motion is connected to the same multi-axis control system of the pile warp beams. ### Claim 6 A system for the control of a pile feeder and of the pile warp let-off motion from a pile warp beam in a face-to-face weaving machine, said beam being driven by a motor, said system comprising: (a) a computer system calculating the necessary pile warp feed rate for each operating cycle of the weaving machine; (b) a measuring system for measuring the current diameter of the pile warp beam, said system being adapted to send a signal to said computer system; (c) a regulator for said motor, said regulator being adapted to receive a feedback of said motor and to send a signal to the computer system whereby the computer system comprises: (a) a low-speed regulating circuit associated with the regulator for controlling the motor speed as a function of the diameter of the pile beam measured by the measuring system, and (b) a high speed regulating circuit associated with the regulator for controlling the motor as a function of a desired pile feed rate and as a function of the weaving speed of the machine. ### Claim 7 (depends on 6) The system of claim 6 further comprising a speed regulating circuit associated with a servo drive and a servomotor for said beam; wherein said high-speed regulating circuit allows control of a desired motor speed, measured by means of a resolver on the motor and taking into account the reduction ratio and the current beam diameter, as a function of the desired pile feed rate and the current speed of the machine as measured by means of a resolver on the machine; and wherein said low-speed regulating circuit allows control of the desired motor speed as a function of the slowly changing beam diameter, and wherein a measuring wheel, with an encoder, is fitted on the pile beam so that the current pile feed rate can be measured. ### Claim 8 A face-to-face weaving machine comprising a pile feeder control system and a pile warp let-off motion, wherein a pile feeder and a pile warp beam let-off motion are equipped with a computer for calculating the necessary pile warp feed rate for each operating cycle of the weaving machine and for using said calculation as a reference value, wherein a computer-controlled direct pile beam drive directly controls operation of both the pile feeder and pile warp beam let-off motion together, and wherein the pile warp beam let-off motion comprises a regulating system consisting of a multi-axis control system provided for one or more pile warp beams. ### Claim 9 (depends on 8) The machine of claim 8, wherein the pile warp beam let-off motion comprises an axis constituting a 1/1 synchronism reference from the weaving machine. ### Claim 10 (depends on 8) The machine of claim 8, wherein each pile warp beam comprises an axis for measuring the pile warp feed rate. ### Claim 11 (depends on 8) The system of claim 8, wherein a ground warp let-off motion is connected to said multi-axis control system for the pile warp beams.