Timing screws are the smallest part of an engine. Their basic design is straight-root. They have an inside diameter and an outside diameter that gradually increases in height. The design of these screws allows them to feed smoothly into a container. There are many different variations of these screws, including those that are used to merge, split, or stop a container.
Straight-root
A straight-root timing screw has a thread that turns in a straight manner. The threads should be of a moderate non-negative clearance, and the pitch diameters must be the same. In addition, the threads should not play when assembled.
Inverse-taper
The inverse-taper timing screw has several advantages. For example, it can evenly distribute a single line of containers into multiple lanes. It can also divide the supply of containers among machines of lesser capacity. As a result, it is especially useful in high-speed packaging lines.
Double-lead
Double-lead timing screws are used to advance timing devices. They are available in several threadforms, including single-start and double-start. Each of these threadforms has a different lead and pitch, but the basic concept is the same. Double-start screws have twice the lead and pitch as single-start screws. They are also known as Double Start thread taps.
Shingle
A timing screw is a screw that is used in a container handling machine. Its main use is in handling flat containers, but it can also be used in combining lines and intermediate operations. Its thread height increases from zero to the desired outside diameter depending on the size and shape of the container. Some models also feature a spring-loaded guide rail to aid random speeding.
Inverse-taper-infeed
An inverse-taper-infeed timing screw is an alternative to a standard straight-root design. An inverse-taper-infeed screw forms a pocket on the inside diameter, tapering down to the root diameter. These screws are used for high-speed packaging lines, to avoid collisions between product and container. They are available in two basic designs: double-lead and multiple-dwell.
Shingle infeed
Shingle infeeds are often used to separate flat-sided containers. The root diameter of the infeed is constant, but the thread height graduates from zero to the outside diameter of the container. This depends on the size and shape of the container. The shingle infeed can also be equipped with a spring-loaded guide rail to assist random speeding.
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