This page contains data for the Marldon Traverse range. If you wish to know more about Marldon and its Manufacturing Program, click Marldon.

Marldon Rolling Ring Traverse Units

Catalogue

1. How To Select
What you should know to select and order the right traverse for your application.

a. Side thrust required

b. Distance to be traversed

c. Rate of traverse (pitch) and Shaft Speed

d. Direction of Shaft Rotation

2. Product Data

	1. Selection Criteria

	a) Side Thrust required Determine the side thrust required for your application and select the appropriate traverse unit from Table 1 below. The maximum side thrust in Newtons is given for each size of traverse unit under the column headed "Maximum Side Thrust N".

Table 1

MODEL	Shaft Diameter (mm)	Maximum Pitch mm/rev	Maximum Side Thrust 'N' at (notes)		Weight Kg
MODEL	Shaft Diameter (mm)	Maximum Pitch mm/rev	100rpm	1000rpm	Weight Kg
RT15	15	11	123	110	1.0
RT20	20	16	170	160	1.8
RT30	30	24	280	260	3.3
RT40	40	32	450	420	8

Your side thrust (F2) requirement, if used in a typical winding application, can be determined by using the following formula:

F2 = (C x F1) / (1.6 x B)

where :

F1(N) = Tension in the material to be wound, expressed in Newtons

F2(N) = Side thrust requirement

The side thrust requirement is directly related to the tension (F1) in the material to be wound.

	Important notes on side thrust
	a) It is important to estimate the side thrust required to ensure that the critical factors in your application are recognised. Often more side thrust is assumed to be necessary than is actually needed. b) The stated side thrust in Table 1 is the value set in our factory for standard units. If a higher value is required it is possible in most circumstances to increase the power by a simple adjustment. c) All Marldon units have 3 rings inside. Competitor companies often promote 4 ring units on the basis that 4 ring units offer significantly increased power. This is a fact. However it should be recognised that often this level of thrust is redundant and the true reason for the proposal is the greater stability on the shaft afforded by 4 ring units. Marldon 3 ring units are already stable, making a fourth ring unecessary. d) You will note that side thrust is slightly increased at a lower rpm.

b) Distance to be Traversed

The maximum width to be traversed should be established. This is normally the inside distance between the reel flanges (dimension "C" above). This distance will be limited for any particular size of traverse unit to the extent that the shaft must not be so long that it would bend under the combined weight of the traverse unit and any other load (such as a pulley or guide roller assembly, or simply the weight of the material being wound) mounted upon it.

The chart below shows the acceptable combinations of shaft length and imposed load. If your application exceeds the unit's capability a secondary support should be used where the weight is supported on another mechanism and the traverse unit provides the reciprocating motion.

We offer complete assemblies to the standard dimensions shown below (Table 2) in section 6.

However, the frame length (A) and shaft extension for the drive (C) (both length of, and whether left-hand or right-hand) may be varied to your requirements on request at no additional charge.

c) Rate of Traverse (Pitch) and Shaft Speed

In most winding applications, for one revolution of the reel, the traverse needs to move a distance equal to the width of the material being wound. As the rate of traverse can be varied by moving the pitch lever, the decision needs to be made as to which pitch will be appropriate for the application, given that the speed of traverse is the result of the combination of the shaft speed and traverse pitch setting.

The maximum rate of traverse (pitch), expressed as the distance travelled in millimeters per revolution of the traverse shaft, is given in Table 1

The traverse shaft is normally driven by the reel shaft via a belt, and for best results the traverse shaft speed should be kept as low as possible and the traverse pitch set near maximum. In fact the optimum ratio of drive shaft speed to traverse shaft speed is calculated as:

( maximum pitch per revolution (per table 1) )
maximum product diameter x 1.1

d) Direction of Shaft Rotation

Rolling ring traverse units consist of moving components which, although manufactured to fine tolerances, still need fine tuning to make them reciprocate equally in both directions. This is done in our factory prior to despatch by means of an adjusting ring in the wall of the unit. In use, the traverse shaft will normally only rotate in one direction, pushing all slack in tolerances in one direction. The adjustment ring will remove this slack. However, if the traverse shaft is reversed the effectiveness of the fine tuning is diminished.

Consequently, it is necessary that the intended shaft rotation is notified to us at the time of order so that the correct setting can be made before despatch.

We describe the shaft rotation, when viewed looking at the pitch control scale, and with the tripping mechanism underneath, as:

"Top Toward" (TT) or "Top Away" (TA)

2) Product Data

a) Traverse Unit Only ("RT")

MODEL	Dimensions (mm)
MODEL	A	B	C	D	E	F	G	H	J	K	L	M	N	O	P	R	S
RT15	96	53	36	32	16	22 25	5	32	16	20	39	47	33	30	5	M5	8
RT20	126	70	70	40	19	33 37	6	40	19	32	54	62	44	41	6	M6	10
RT30	144	86	80	50	26	45 52	7	47	22	40	67	76	55	51	8	M6	10
RT40	204	112	160	68	32	63 70	8	59	26	50	76	91	67	66	9	M10	12

b) Complete Traverse Assembly ("RTA")

Table 2

MODEL	Shaft Dia (mm)	Frame Length A	Effective Traverse B	Shaft Extension C	Standard Dimensions
MODEL	Shaft Dia (mm)	Frame Length A	Effective Traverse B	Shaft Extension C	D	E	F	G	H	J	K	L	M
RTA15	15	480	326	30	10	470	33	75	60	40	37	M6	15
RTA20	20	673	476	40	13	660	44	104	70	47	52	M10	15
RTA30	30	726	490	60	16	710	55	120	90	60	66	M12	15
RTA40	40	1160	820	80	20	1140	67	150	120	80	85	M16	25

We offer complete assemblies to the standard dimensions shown above. However, the frame length (A) and shaft extension (C) may be varied to your requirements on request at no additional charge.