Glossary


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31) Live roller conveyor

The most common conveyor used in large warehouses and distribution centers. Rollers are powered through various means and therein producing movement in needed direction. The load is supported directly by the roller mounted in a frame.

32) Magnetic belt conveyor

A steel belt and either a magnetic slider bed or magnetic pulley is used to transport ferrous materials vertically, upside down, and around corners.

33) Minimum pressure accumulation conveyor

Conveyor minimum pressure accumulation is when product is accumulated and the driving force is not removed. It is called minimum pressure because the pressure of the driving force is kept to a minimum. Pressure will build up as more product accumulates, but can be overcome with controls designed specifically for the application. The advantage to minimum pressure conveyor is a higher discharge or single load release rate than with zero pressure accumulation.

34) Motor driven pusher

An electric motor driven conveyor sortation device.  See Pneumatic pusher .

35) Non-contact accumulation conveyor

Non -contact accumulation on a conveyor occurs when the product is accumulated with a definite space between each accumulated load. This is accomplished by controlling the speed of the carrying surface. Most zero pressure conveyors are of the non contact type.

36) Order picking

Order picking or order selection is the process of retrieving individual items (from storage locations) for the purpose of fulfilling an order for a customer. Schemes by which to achieve efficient order picking will vary widely. However, in all cases it involves locating the items in storage; creating a plan for retrieving the items; physically picking the items (either automatically or manually); sorting and/or assembling them into discrete orders; and in the end even packaging the orders for delivery. Although defined as a process, order picking cannot be achieved without the appropriate computer software and mechanical equipment, including the storage medium, such as pallet racks, shelving, AS/RS (including carousels) and flow delivery racks, and a means for transporting items from receiving to storage and from storage to packaging and shipment. A variety of industrial trucks and conveyors will be found in most order picking applications. Order picking may also involve robotic like devices for physically picking discrete items from their storage location. See also Warehouse Management Systems or WMS .

37) Overhead conveyor

A form of conveyor consisting of a continuous chain running beneath a continuous, stationary, flanged rail. Individual carriers spaced equidistant along the length of the conveyor are suspended from the chain. The chain pulls the carriers. Vertical support is derived from the fact that the carriers are also connected to a small trolley with wheels that roll cross sections, trolleys and carriers. A few common carriers include a tray, platform or simple hook. A less common alternative to the chain drive is a worm drive.

38) Pallet flow rack

May be considered back-to-back selective rack.  Inclined conveyor wheel sections are installed in the rack enabling back-loaded pallets are allowed to flow by gravity to the front or pick face.  Pallet flow rack is useful for the movement of fast-moving items and serves to increase density of storage and throughput.

39) Platform conveyor

Another form of the conventional poternoster (See definition for Poternoster) is the platform conveyor that consists of multiple, equally spaced battens which form rigid horizontal surfaces in one direction (up and down) but behave like the front of a roll top desk on the return. Platform conveyor is an effective means of moving a continuous flow of pallets or other unit loads between levels. Another variation of the posternoster concept, which permits both vertical and horizontal movement of load, consists of freely swinging platforms suspended between two parallel chains.

40) Pneumatic pusher

An air-powered conveyor sortation device.  This device utilizes a ram and cylinder configuration and its movement is programmed to redirect packages and materials on a conveyor line.

41) Pnuematic puller

An air-powered conveyor sortation device.  This device is used to redirect packages and materials on a conveyor.  Pulling device travels beyond the object to be redirected and retracts, therein pulling the object in the desired direction.

42) Pop-up rollers

Rollers which rise up between chain or roller conveyors to move the item off the conveyor to the desired location.

43) Pop-up skewed wheel sorter

An in-line diverter conveyor that has wheels that pop up between the rollers of a powered roller conveyor or between belt conveyor segments and direct sorted items onto a powered take-away line. Fairly high speed sorting, in the range of 120 cases per minute, can be achieved.

44) Poternoster

A type of vertical conveyor that provides for continuous operation of multiple, equally spaced, load-carrying units fixed to chains that move continuously in an endless loop. With such a system the loading and unloading, usually automatic, occurs while the conveyor is running, resulting in greater throughput and an even flow of loads. This type of vertical conveyor is common in Europe

45) Power and free conveyor

A variation of overhead chain conveyor is "power and free". In a conventional overhead conveyor the carrier is permanently fastened to the drive chain, in the power and free case the carrier can mechanically disengage from the drive chain and essentially idle while the chain continues to move. Power and free conveyors can also be inverted so that they can be mounted to the floor, in which case the carrier or tray rides on top of the guiding rail as opposed to being suspended beneath it.