Abstract:
A method for controlling the run-up of a conveyor belt BY increasing a setpoint value of the belt's speed with an increasing acceleration in a first time interval, and with a decreasing acceleration in a second time interval, thereafter plotting a curve of the increasing acceleration against time which has a positive curvature in the second interval, a second time derivative of the acceleration in the first and the second time interval is at least approximately constant and at least approximately equal and opposite.
Abstract:
The invention relates to a method for the control of the chain drive mechanisms of underground working machines and a correspondingly equipped chain scraper conveyor. The invention proposes to filter out a detection signal (Serk), representative of the currently arising vibrations of the chain (1), from the operating data of the main and auxiliary drives (I, II) by means of a detection device (34), and to take this to an active suppressor (35), which generates a time-variable control signal (STilgung) in accordance with a suppressor function, with which, in the frequency range of the vibration of the chain, a change is effected to a control value, e.g. (Ssoll) for the closing pressure adjustment of a multiple disc clutch (6) of at least one drive unit for the suppression of vibration by the abstraction of energy from, or the introduction of energy into the chain (1).
Abstract:
A method and an apparatus are provided for singulating articles received in a slug and/or manipulating such articles to create a controlled gap between a trailing edge of a leading article and a leading edge of a successive article, while targeting a desired throughput. For singulation, a plurality of belts are mounted adjacent to each other with a slide chute between each pair of adjacent belts, articles moving from an infeed belt and passing from one belt to another through the chute therebetween. A plurality of sensors are positioned such that there is a single control sensor for at least selected ones of the belts, each control sensor sensing article position on a corresponding belt. Controls are provided for operating each belt in response to a corresponding control sensor, an operative state of a downstream belt and/or a difference between the desired throughput and detected throughput. For creating controlled gaps between successive articles, a plurality of belts are provided, mounted adjacent each other, articles being received on a first of the belts and passing from one belt to an adjacent belt. A plurality of control sensors are sensing article position relative to each belt and controls are provided which operate each belt in response to a corresponding control sensor, an operative state of a downstream belt and/or the difference between the desired throughput and the detected throughput. The controls are also operative to initiate stopping of a belt if a detected trailing-edge to leading-edge gap is smaller than the desired minimum gap.
Abstract:
In industrial belted conveying systems, it is common to have a pull chord extending longitudinally along the conveyor, sometimes one chord on each side of the conveyor, said chord being attached to a trip mechanism, or safety switch. A number of serious accidents have occurred in the industry due to unprotected nip points at the return idlers under these conveyors. Accidents were the result of these pull chords not being easily accessible for manual activation of the safety features. In this invention, a primary pull chord is placed near the nip point, inserted through guides, and linked to one or more secondary longitudinal pull chord(s). The primary pull chord may be sleeved with a semi-rigid, pliable rod as additional support between the guides. Further, this semi-rigid rod may be encapsulated in a lightweight foamy tube to give it bulkiness. In the event of an inadvertent incident, the primary pull chord is entrained into the nip point, pulling the secondary longitudinal pull chord which then trips the safety switch, automatically disabling the conveyor drive.
Abstract:
A conveyor has a rotary encoder for measuring the amount of rotation of a driven sprocket having an intermittently drivable chain reeved therearound, and a processor for processing the measurement obtained by the encoder as operation support operating data corresponding to the amount of rotation of the driven sprocket. The processor determines a reference position of the chain in time series when the chain is moved a distance at a time by intermitting driving, computes the actual position of the chain corresponding to the reference position based on the measurement obtained by the encoder, and computes the deviation of the actual position of the chain from the reference position.
Abstract:
In an adjustment zone (B), the spacings between objects, which are conveyed by independently movable holding elements (2) along a rail track (1) are e.g. for a processing operation adjusted to a predefined value larger than the minimum spacing. To achieve this, a continuously circulating and compressible, adjusting chain (5) running in a circulating track is provided, which adjusting chain (5) is elongatable in a controlled manner. The circulating track extends at least in the adjustment zone (B) parallel to the rail track (1) such that the adjusting chain is in engagement with holding elements (2) conveyed along the rail track (1). Furthermore, control means for adjusting a predefined compression of the adjusting chain (5) are provided in the adjustment zone (B). The adjusting chain (5) comprises e.g. chain links (6) joined together in an articulated manner. Assigned to every second articulated joint of chain links (6) are guide rollers (7.1) rolling in a circular guideway (8) and drivers for driving holding elements (2), and assigned to the other articulated joints are control rollers (12) rolling along a cam (11) which serves as control means. The distance between the circular guideway (8) and the cam (11) determines compression of the adjusting chain (5) and therefore the spacing between the holding elements (2) in the adjustment zone (B). The device is suitable in particular for adjusting spacings between holding elements greater than the minimum spacings as established between holding elements being conveyed in a pushed manner, wherein the holding elements are pushed and the adjusting chain (5) is circulating passively.
Abstract:
The invention relates to a device for monitoring functional units on escalators and moving walkways, comprising several processors which monitor predetermined parameters of a particular functional unit independently of each other. The processors are connected to devices for immediately shutting down the escalator or moving walkway and interact with at least one other processor which is provided for controlling and/or diagnosing functions which are not relevant to safety.
Abstract:
An apparatus for the linear positioning and for the position recognition of a substrate, comprising a linear transport for conveying the substrate, a sensor whose sensor field is set to a freely selectable braking position along the conveying path of a substrate feature of the substrate, and a controller connected to the linear transport and to the sensor for decelerating and stopping the linear transport, so that the substrate feature comes to rest in an onserting position.
Abstract:
In a handler attracting and transporting ICs by the use of a vacuum pick-up head, a control system is provided which provides for removing a jammed IC without the need for opening the door of the constant temperature chamber, if the vacuum pick-up head's failure to grasp an IC should cause jamming. A jam detecting means detects the occurrence of jam to interrupt the operation of the handler, whereupon a motion control means is activated to move the vacuum pick-up head to and stop it at a position distant from the site of jamming whereby the space above the site of jamming is cleared. This allows for removing the jammed IC by using a manipulator rod inserted through a through-hole formed through the outer wall of the constant temperature chamber.
Abstract:
A retaining device (10) for a conveyor belt assembly (12) which includes a clamping means (14) for clamping a conveyor belt (36) of the conveyor belt assembly, and a biasing means (38,40) for displacing the clamping means between an inoperative condition and an operative retaining condition wherein the clamping means clamps a part of the belt to tension a material carrying portion of the belt in the event of a loss of tension in the belt.