Since 1957 Ernst Timing Screw has provided it's
customers with the best quality timing screws on the market.
Timing screws form Ernst can be made out of many different materials,
colors, lengths & diameters. Our timing screws can also handle
any shape container including round, square, oval, and triangular.
Bottle spacing ,also known as pitch, is no problem at Ernst
because of the specially designed machines and software we use.
very dedicated to providing quick, prompt delivery of quality
timing screws to our customers.
your packaging line running smoothly and safely at peak efficiency,
split second timing and accuracy in containing handling is
The major function
of any timing screw is to provide the smooth flow of containers
into or between packaging machines, but today's highly sophisticated
timing screws can do more than just feed containers into the
design variations, the timing screw can halt or position containers
for packaging operations and can serve as a line-control device.
They can also accelerate, decelerate, divide or combine the container
flow. The key to peak performance is dependent on the precise "form
fit" between the container and timing screw.
direct insight into timing screw specification, let us examine
some of the more widely used timing screw configurations and
discuss their specific packaging purposes.
The basic straight-root design (Figures 1-4) is formed when the lines of the
are parallel to the shaft.
In the common
form of this design, thread height is gradually increased to
the outside diameter to create a smooth container infeed. Variations
on this and other screw designs, numbers and placement, enable
timing screws to divide and merge containers. They can accelerate,
decelerate or even stop the motion of containers for special
configuration accepts randomly fed containers more readily than
the straight-root design and is also more effective in separating
square containers, a design in which the initial pocket of the
screw is formed at the maximum outside diameter, then it tapers
gradually to the root diameter.
(Figure 1): Particularly
useful on high speed lines, this screw accepts containers at
the discharge end of one machine and positively controls the
container to the infeed of the next machine. This prevents container
contact, thus eliminating scratching and spillage of the contents.
The pitch of the screw can remain the same of be varied as called
for by the machine pitch requirements.
Figure 1. Transfer
discharge (Figure 2): Known as the dual-flight, or
double-lead screw, this design will maximize container output
of two threads cut into the screw. These threads discharge
containers every 180° of rotation instead of the normal
360° standard. This effectively doubles the output. Use
for this screw is limited, however, since not all packaging
machines are capable of functioning with this timing arrangement.
Figure 2. 180 Degree Discharge
dwell (Figure 3): This screw design, known as stop-position,
can stop a container one or more times to perform different
functions. The screw has a vertical section in the screw pitch
that momentarily halts the container in its forward motion.
It is useful for such actions as banding, sleeving, labeling,
cottoning, leaflet placement, in-line filling, closing, plugging
can vary the number of dwells and the degree of dwell time over
wide limits to suit packaging requirements.
Figure 3. Multiple Dwell
(Figure 4): When
multiple containers must be collated into a grouping, this design
performs the operation smoothly by picking up two or more containers
in a single pocket and then spacing the collation by a full pitch
from the next group. This group of containers can them be discharged
closely spaced to enable banding or overwrapping of needed.
Figure 4. Grouping
Screws: have revolutionized
the timing screw world and because of this, Ernst has answered this
making sure we can produce the smoothest running screws on the market.
Ernst has been making Turn-A-Round Screws for 30 years, long before
the competition even cut their first Straight Root Screw. Turn-A-Round
Screws can be cut to discharge on any degree needed (45° , 90° ,
All T.A.R. Screws can be run on Ernst Drive Systems.
(Figure 5): This
requires a custom-designed shape to enable precise positioning
of oddly shaped containers that could normally travel in two
positions but, with this screw design, can be made to travel
with either a point or a flat surface facing the screw.
Figure 5. Orienting
performed on found containers to accomplish air cleaning, bottle
washing, bottom coding, labeling or cartooning. Using specially
shaped guide rails in conjunction with the timing screw, a vertical
container can be twisted from an upright position with the opening
at the top to an inverted position with the opening at the bottom.
A container can be taken from a vertical to a horizontal position
to run from along side to on top of the timing screw.
(Figure 8): This
configuration utilizes a pair of equal length of staggered length
screws also known as rotational orienting or turn-around designs.
They can orient containers in any required axial position between
0° and 360°.
Used for turning
of containers in group fillers to occupy less space, this design
enables filling spouts to be grouped on shorter centers. This
same action can be used to assist in labeling operations. It
can also turn containers between such operations as primary labeling
and the attachment of secondary labels of literature.
Figure 8. Turning
and neck stabilizing: Timing screws can be mounted
one above the other to increase the stability of tall and unstable
bottles, particularly those with multiple cross sections such
as a square body with a round neck.
using a larger screw on the bottom and a smaller screw in the
cap or neck area, both screws are kept running uniformly in pitch.
Where the control of the tall, unstable container becomes even
more critical is in such functions as labeling, coding and video
function is performed by a pair of screws of different lengths
with equal infeeds, that will offset a square or rectangular
their sharp corners and little or no radius, square of rectangular
containers must first be offset to enable a thread form to better
separate, accelerate and control this type of container.
Figure 9. Shingling
fitting (Figures 11,12 and 13): Form fitting the timing
screw to the container is especially helpful in controlling
containers at faster operating speeds. For example, Ernst Timing
Screws makes timing screws which can be cut to match the contour
of the containers, no matter what the shape or size.
Figure 11. In a form fit timing screw the sam container remains
Figure 12. Unusual container shapes require form fitting timing
screws for proper handling
Figure 13. Non-form fitting timing screws allow for unwanted
Systems - Combining & Dividing
(Figure 6): A
particularly useful design when the output of two lines is needed
to be made into one. Some examples are when two unscramblers
are needed to supply a single packaging line, the merging of
two products into combination packages or the merging of two
lines into one or more packaging operations. This design is accomplished
by pairing two screws of the same configuration, allowing two
lines of containers to be merged into one.
these two screws are identical, their axial positions are 180° apart,
thus enabling alternate container feeds from two different converging
Figure 6. Combining
(Figures 7 and 10): One
of the most functional designs, this pair of timing screws can
evenly distribute a single line of containers into multiple lanes.
This screw configuration can also divide a supply of containers
between machines of lesser capabilities. For example, a multiple
case packing operation requiring a single line can be divided
at high speeds into multiple lanes.
Figure 7. Dividing
Figure 10. High speed dividing of 2-liter plastic bottles.