摘要:
Bei einer Anlage (2) ist eine aktuelle Anlagengeschwindigkeit (v akt ) für einen Arbeitsprozess (4) bis zu einer Maximalgeschwindigkeit (v max ) wählbar, wird ein Bremsgenerator (6) für eine Drehachse (8) der Anlage (2) verwendet, wird ein hinsichtlich seiner zulässigen Höchstdrehzahl (n max ) für die Anlage (2) unterdimensionierter hochpoliger Synchronmotor (10) als Bremsgenerator (6) verwendet, wird die aktuelle Drehzahl (n akt ) des Synchronmotors (10) überwacht und wird die wählbare Anlagengeschwindigkeit (v akt ) auf eine Grenzgeschwindigkeit (v grenz ) begrenzt, wenn die aktuelle Drehzahl (n akt ) die Höchstdrehzahl (n max ) erreicht, so dass der Synchronmotor (10) höchstens mit der Höchstdrehzahl (n max ) betrieben wird. Bei der Verwendung eines hochpoligen Synchronmotors (10) in einer Anlage (2), wird dieser wie oben unterdimensioniert und die Anlagengeschwindigkeit auf eine Grenzgeschwindigkeit (v grenz ) begrenzt. Eine Anlage weist einen wie oben unterdimensionierten hochpoligen Synchronmotor (10) und eine Steuer- und Auswerteeinheit (22) auf, die die Anlagengeschwindigkeit auf eine Grenzgeschwindigkeit (v grenz ) begrenzt.
摘要:
Warp yarns (3) unwound from a supply unit (2) moves to reach a yarns-interlacing area (5), wherein a textile product (6) is formed. A dragging roller (8) advances the textile product (6) away from the yarns-interlacing area (5), keeping a selected target advancement speed Vtv. A braking action is achieved on the warp yarns (3) upstream of the dragging roller (8), to provide a supply traction force SF along the warp yarns (3). Monitoring of the supply traction force is achieved based on an instant value DT of a drag torque applied by the dragging roller (8). A target value SFtv of the supply traction force is kept during operation of the textile machine (1) by repeated control cycles, each comparing the instant value DT with a target value DTtv of the drag torque, corresponding to said target value SFtv of the supply traction force. The braking action is modulated to keep the supply traction force SF at the target value SFtv.
摘要:
An apparatus and method are provided whereby two superposed strips (26, 28) of documents are conveyed in a direction of conveyance (30) toward a downstream workstation. The strips (26, 28) are conveyed over one another in a direction of superposition whereby leading edges of documents of one strip alternate in sequence in the direction of conveyance (30) with the leading edges of documents in the other strip. A determination and control circuit (190) is provided to determine whether the leading edges of documents in one strip are tending to creep up on the leading edges of documents in the other strip due to differing speeds of motion of the two superposed strips. If a creeping condition is determined by the circuit (190), the circuit (190) energizes braking means (400) whereby the motion of at least one of the strips is at least temporarily retarded for rectifying the creeping condition. The determination and control circuit (190) periodically permits the deenergization of the braking means (400), even when a creep condition is determined. In an embodiment wherein the braking means comprises rollers (102, 122), the circuit (190) periodically permits the rotational incrementation of the rollers (102, 122), thereby precluding uneven wear of the rollers (102, 122) which might otherwise result if the brake were continuously applied.
摘要:
There is described a magazine unit (10) for a packaging machine (1). The magazine unit (10) comprises at least a support device configured to rotatably carry a bobbin (11) of a web of packaging material (3) and a brake device (31) configured to decelerate a rotation of the bobbin (11) around a rotation axis (B). The brake device (31) comprises one or more brake elements (36), each one having a respective interaction surface (37) movable with respect to the bobbin (11) being carried by the support device along a displacement direction (D2) substantially parallel to the rotation axis (B). Each interaction surface (37) is moveable between an idle position in which the respective interaction surface (37) is spaced apart from a respective lateral surface portion (34) of the bobbin (11) being, in use, carried by the support device, and an active position in which the interaction surface 37 is configured to contact the respective lateral surface portion (34) of the bobbin (11) so as to decelerate the rotation of the bobbin (11) around the rotation axis (B).
摘要:
A magnetic braking apparatus (301) is integrally attached with a load detector (17, 303) such as an arm-like load cell through an attachment member, an outer fin, or a rotary joint between a yoke body (201) and a stationary portion of an outside construction or facility thereby to form a magnetic braking apparatus having a function of load detection. A tension control system incorporates the magnetic braking apparatus with the load detector (17, 303) attached thereto to apply a braking force to a let-off reel. A controller (304) in the tension control system calculates a roll diameter (D) of the let-off reel based on a number of rotations detected by a rotation detector (102) and a number of pulses generated in one rotation of the let-off reel, and generates a control signal representative of a desired braking torque which corresponds to the calculated roll diameter. The controller (304) further receives from the load detector (17, 303) of the magnetic baking apparatus, a feedback signal representative of an actual braking force applied to the let-off reel, and the controller (304) calculates an error signal between the desired braking torque signal and the feedback signal. The error signal is applied to the magnetic braking apparatus (301) to excite the same. Thus, the accuracy of tension control is improved. When a mechanical loss compensation signal is applied to the controller (304) to generates the control signal representative of the desired braking torque by taking the mechanical loss compensation signal into consideration, the influence of the mechanical loss can be removed.
摘要:
A magnetic braking apparatus (301) is integrally attached with a load detector (17, 303) such as an arm-like load cell through an attachment member, an outer fin, or a rotary joint between a yoke body (201) and a stationary portion of an outside construction or facility thereby to form a magnetic braking apparatus having a function of load detection. A tension control system incorporates the magnetic braking apparatus with the load detector (17, 303) attached thereto to apply a braking force to a let-off reel. A controller (304) in the tension control system calculates a roll diameter (D) of the let-off reel based on a number of rotations detected by a rotation detector (102) and a number of pulses generated in one rotation of the let-off reel, and generates a control signal representative of a desired braking torque which corresponds to the calculated roll diameter. The controller (304) further receives from the load detector (17, 303) of the magnetic baking apparatus, a feedback signal representative of an actual braking force applied to the let-off reel, and the controller (304) calculates an error signal between the desired braking torque signal and the feedback signal. The error signal is applied to the magnetic braking apparatus (301) to excite the same. Thus, the accuracy of tension control is improved. When a mechanical loss compensation signal is applied to the controller (304) to generates the control signal representative of the desired braking torque by taking the mechanical loss compensation signal into consideration, the influence of the mechanical loss can be removed.