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March 20, 2010 / apexprecitech

RoCoS Compact spinning and Apex Drafting load gauges

RoCoS was launched  by Rotorcraft AG amidst great expectations. Till then compact spinning was conceivable by pneumatic suction only. It was upto RoCoS to demonstrate a neat, decisive mechanical set up to compact the spun yarn. This means an enormous power saving over conventional pneumatic suction type condensing mechanisms.

RoCoS is an ingenious development over the conventional drafting for spinning. By adding an extra roller running at the same speed as the front top roller, a new passage area for the yarn fibres is set up. These fibres pass through a mechanical guide like condenser made of ceramic material. This condenses the fibres which are then clamped by the newly introduced front roller and twisted by usual means by the ring + traveller mechanism.

(pictures from the official website of M/s Rotorcraft AG)

RoCoS and Importance of Top Arm Loads:

Since, the newly created roller shares the same saddle as the second roller, correct load setting of these two rollers are of utmost importance. Almost every spinner who has installed RoCoS in his mill has seen benefit from regular load setting.

RoCoS is installed in both SKF PK 225, (also pk 2025), and P3-1 draftings. In all of these draftings, correct load setting is important. The front saddle load has to be increased so as to compensate for the load sharing with the front idler roller.

Apex has been at the forefront in drafting load measurement and is a proud supplier of many Top Arm Load Gauges to Rotorcraft over the past six years.

To see a write up on our Apex Top Arm Load Gauge , click on this below link

Apex Top Arm Load Gauge

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March 17, 2010 / apexprecitech


The textile machinery major Suessen, has continuously introduced breakthrough design features in Ring spinning and Roving top arms. Suessen was the first to introduce the plate spring for loading the arms.

Its vintage UT 200 and UT 600 series of  top arms have proved beyond doubt that plate springs are by no means inferior to helical compression springs (as promoted by SKF) .  Suessen’s technological uniqueness further improved with the HP-A 310/320 top arms finally culminating in the spectacular ” Suessen ELITE” compact spinning system.

The HP-A top arm is a rigid top arm for ring spinning. The front roller is loaded at 16 Kg which is  shiftable to 12 Kg by turning a nut.  The middle apron roller and the rear roller are loaded at 14 Kg each.

When retrofitted with Elite compact spinning system, the front roller is set at 23 Kg and shiftable to 17 Kg.

Apex has always been a favourite with spinners when it came to top arm load measurement. Suessen top arms are no exception. We were approved by Suessen and their Indian counterparts are insisting on checking with Apex Top Arm Load Gauges in all their installations.

To view the full article on our Apex Top Arm Load Gauge please click on this <link>

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March 16, 2010 / apexprecitech


Rieter P3-1 is perhaps the most widely distributed top arm in the spinning industry today. It is a simple top arm to work with but a little complex to understand in its intricacies.

This top arm is supplied by both Lakshmi Machine Works Ltd and Rieter Textile Systems in their Ring Frames. Rieter considers this top arm so effective that the same arm is used in Rieter’s flagship ” ComforSpin” compact spinning frames with slight modifications.

This top arm is pneumatically loaded. A long hose runs through the hollow hexagonal arm bar that also doubles as a housing for this pressure hose. This hose is pressurized to around 1.4 to 1.8 bar to get desired loads at the rollers.

The top arm is loaded from the fulcrum. The fulcrum is loaded by the expanding hose inside the arm bar. When the arm engages with this fulcrum, the load is transmitted to the arm area.

In this area, there is a bridge which divides the applied load to the combines front and second rollers and to the third rollers. The division of load is varied by shifting the pivoting distance of division by simply altering the position of a locating pin. This is an ingenious setup whereby simply by changing the position of the pin, loading ratio is changed.

The load transmitted to the first and second roller is through another bridge which again splits the load between the fron and second (apron) rollers, Here again three pin positions are given by which the ratio of loading between them can be changed.

The recommended load setting values for cotton spinning in the P3-1 top arm is like this

As always, Apex Top Arm Load Gauges were the first   to measure the top arm loads in P3-1 successfully and accurately from the very beginning.  We were initially discouraged by the spinners in the measurement of P 3-1 saying this was a pneumatic system and measurement was not at all necessary even after cots regrinding.

But experience is a better teacher. When we demonstrated the possible variations with worker neglect, pneumatic hose wear, and top arm general wear, spinners quickly understood its value. One defective top arm can play as a black sheep and spoil the quality of a lot. Variations of even 5 to 10 % in top arm loads can alter CSP and USTER values. Yarn appearance is directly affected by variations in top arm loads.

Also one idle top arm is a potential loss to  the mill. The gauge may be small but its indispensability to a spinning mill is undisputed. Now, mills are buying these gauges right at the project stage.

You can read more about our Apex Top Arm Load Gauge (with video  demonstration) by clicking on this <link>

If you have found this article useful and would like to comment on it , please click on this <link>

J Venkatasubramanian

March 16, 2010 / apexprecitech


Trutzschler draw frames have always fascinated everyone with their original features. Everytime they announced a model, a novel idea would definitely be in there.

click on photo to enlarge

TD 03 is no exception. Built over the earlier HSR series platform, these machines display one extraordinary, never before tried feature. The loading arm is laterally positioned in them instead of the right over top design of the loading arm. In other words, the top arm is designed like a hinged door. Look at the following picture

click on photo to enlarge

This is a four over three roller drafting. The first roll is a guide roll for the web coming out of the drafting and usually is loaded at 15 kgs/end. This roller is seen in the picture with an inclined angle of loading in the front. The remaining three rollers are loaded at 30 Kg/end. The loading is pneumatic and the load is separate for each roller.  This means there is separate air supply to load each roller and each is individually variable.

Apex Draw Frame Load Gauges are eminently suited for measuring the loads in TD 03 machines. In fact, we have come out with a special gauge for TD 03 in view of its restrictions in the drafting space.

Look at the article for a description of Apex Draw Frame Load Gauge by clicking on this <link>

If you liked the above article and find it useful, you can leave a  comment by clicking on this <link>

J Venkatasubramanian

March 15, 2010 / apexprecitech

RSB and SB Draw Frames and Drafting Load measurement with Apex Gauges

Rieter launched their famous RSB draw frames about fifteen years back which still remains the main workhorse in many spinning preparatory departments. The testimony to its success is that the same model is still in production (Lakshmi LRSB 851) in India.  Rieter models still retain  the core design intact.

Lakshmi has this machine in single delivery design. Rieter has the double delivery model SB 20 (formerly SB 2). The drafting system in all these machine are same. The main features of the drafting setup 9with respect to loading)  are

1. Flat bed drafting

2. Three over three drafting.

3. Spring loaded top rollers.

4. Short top rollers to reduce bending of rollers and for even distribution of nipping load to the bottom roller (and the sliver)

5. All the rollers are equally loaded. (32.5 Kg each at ends in all rollers)

6. Adjustment of rollers are possible for all the rollers of one end by moving the locking hook of the loading arms up and down.

7. Each loading cell of the top roller has a spring housed in a casing with fixed loading. (with no provisions for adjustment)

8. Adjustment of loads and equalization are extremely important. Variations of even 1.5 Kg have shown Uster variations. Similarly difference in end  to end loads affect CV % and  Uster .

click to enlarge photos

Apex Draw Frame Load Gauges and RSB Drafting

Spinners across the world are aware of the critical importance of regulation of Drafting Loads of RSB and SB draw frames. From its very introduction, our Apex Draw Frame Load Gauges accurately measured loads in these rollers and till date most of the modern units of the world are using these gauges.

Please click on the following link to read more on this gauge and to see a video demonstration

Apex Draw Frame Load Gauge

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March 14, 2010 / apexprecitech


Texparts has another trusted speed frame drafting top arm PK 1500 which has found wide acceptance with cotton and synthetic spinners.

This is a spring loading top arm much like its predecessor SKF 1600-40 top arm. This top arm is available in 4 roller and 3 roller versions.

The four Roller version is here

The load setting values for this top arm is here

Similarly the 3 roller drafting is below

And the load setting values for 3 Roller drafting is here below

Conversion: 1 daN(Deca Newton) = 1 Kg

The above loads are variable in steps only by shifting the loading nuts by a special lever. Apart from these , the cumulative load can be increased or decreased by the two setting screws provided at the back of the top arm.

Needless to say, our Apex Top Arm Load Gauges were very successfully used to measure the top arm loads in PK 1500 top arms. Very accurate and reliable, these gauges are the favourite of many a quality conscious spinner. Click on the following link to read on our Apex Top Arm Load Gauge with a video demonstration.

Apex Top Arm Load Gauges

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March 12, 2010 / apexprecitech


Texparts PK 5025 top arm is a trend setting one in that it carries new design features hitherto unknown in textile drafting.

First, the old concept of individual loading is dispensed with. Second , a pneumatic spring has been employed for load generation.  One may argue that the same principle was used by RIETER in their FS 160 and the later P3 drafting series.

The difference between them is that Rieter design loads the arm near the pivoting point. But in Texparts, the pneumatic spring (a pressurised hose) actually runs through the length of the top arm loading each saddle . This is a fresh outlook at top arm design and going by the customer review and the work it is doing in the spinning floor, the design seems validated and a viable and trouble free one.

They are available in two models. A four roller drafting and a three roller one.

click to enlarge photos

The load setting values are given below.

3 Roller Version & 4 Roller Version

Apex top Arm Load Gauges are the most trusted ones for a keen eyed spinner who wants to keep a close watch over the loads and general behaviour of drafting apparatus. Our gauges are easy to use , easy to understand and trouble free. Their strict calibration checks at our factory ensure that each one measures the exact load every time.

Just check the Product at this link below

Apex Top Arm Load Gauges

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March 8, 2010 / apexprecitech


When we suggested , way back in 2000 that our gauges  be used to measure the loads of drafting top rollers of Rieter Draw frames, we met with scorns and negative remarks.  ” What ? Rieter machines ? Why do they need measurement ? We do not need such instruments. ”

We patiently explained that already our gauges had proved a terrific success with the SB &  RSB 1, 2, 51, 851 and 951 machines. Also, since the spring loaded top rollers definitely needed measurements, they agreed for a demonstration. They saw that, the top roller loads never remained uniform – despite  perfect grinding of the top roller cot, correct alignment of rollers , good original top rollers and correct setting with the height gauge.

In some machines, the variations remained minimal. In some variations went beyond 10% even to 15%. Another factor observed was that the end to end loads were not equal ! When these were adjusted, the smile was also back on the maintenance manager as he now had a sliver far better than earlier times, CV , Uster all improved. (In this blog, I have given some actual results compiled from Spinners)

Look at this picture of Rieter drafting setup. There are four rollers. The front one is actually a guiding roll with less load of 15 Kg/ end. The rear three are the actual drafting rollers with load of 30 Kg/end.

The procedure to adjust loads are given in this picture

Now, till date, we have sold more than a thousand Apex  draw frame load gauges and most of  the gauges were sold with adaptors for Rieter draw Frames. Our love story with leading brands of machinery continues.

(Rieter and Rieter D 35, D40 are trademarks of Rieter Textile Systems)

If you liked this article or found it useful, you can leave a comment by clicking on this <link>

J Venkatasubramanian

March 6, 2010 / apexprecitech





PK 2025 Top Arm

PK 2025 is one of the largest working top arms in the spinning industry today. It is an advanced one than its predecessor, the hugely popular SKF PK 225 top arm. SKF PK 225 is still continued to be produced in India and similar designs are also coming out of China.

But PK 2025 is another class act altogether. It retains some basic similarities  with PK 225 like

1. The front saddle has three adjustable load steps – 10 Kg (Black), 14 Kg (green) and 18 Kg (Red)

2. The same drafting geometry with parallel top and bottom rollers.

3. Rigid spring housing design.

4. Handle and rear load setting screw set up.

The improvement is there in middle and back roller load setting adjustment. Earlier in PK 225, only the front roller had load adjustment. Here, all the rollers have the facility. This is a significant one.  The older one had a problem in that the middle and back roller loads could not be changed independently. In other words, the increase in loads of middle and back rollers simultaneously increased the front roller load. Now, this problem is rectified in PK 2025. Look at this picture from Texparts

Apex Top Arm Load Gauge and PK 2025 Top Arm

Using the Apex Top Arm Load Gauge in combination with the PK 2025 top arm is the most ideal. After the load is set, the gauge is held in the saddle of the top arm and pressed.   Usually, we see variations from one top arm to another  even after the feeler gauge is used.

This variation can be attributed to manufacturing tolerances of the top arm. Due to this many spinners have abandoned the feeler gauge and instead use our Apex Top Arm Load Gauge. We know this is a loaded statement but we stand by what we say. The proof is with the spinners who use the gauges.

To view the article on our Apex Top Arm Load Gauges click on this <link>

If you liked this article or found it useful, you can leave a comment by clicking  on this  <link>

J Venkatasubramanian

March 5, 2010 / apexprecitech

Leading Machine manufacturers put faith in Apex

Dear Spinner

This is just to show the confidence of the leading textile machinery manufacturers have in us. Just a quick look at our client list

1. Suessen GmBH (Elite Compact spinning)- Repeat orders

2. Rotorcraft , Switzerland( RoCos compact spinning)   Repeat orders

3. Zinser, Germany

4. Zinser, China

5. Lakshmi Machine Works Ltd (Repeat orders)

No wonder, Apex Top Roller Load Gauges have set the benchmark in drafting Load measurement and regulation.

If you still have not used our instruments, please get in touch with us. Send a mail to <>.

If you want to read about our full products please click on the following headings

1.Apex Top Arm Load Gauges

2. Apex Draw Frame Load gauge

3.Apex Comber Detaching Roller Load Gauges

You have only your bad yarn to lose and a good  reputation to gain.