Wearstrip arrangement depends on the installation space and other factors. An example is shown in the figure below. (High load application)

2-1-1. Chain slack

Table 5 shows the spacing L between return rollers supporting the chain on the return-way near the drive sprocket. The amount of the slack of the chain between these rollers should be 50 to 100 mm, or the chain may result in skipping. The slack prevents the chain skipping.

Table 5. Return roller spacing L

WT1907, WT3827, WT3835, WT5707

WT0705-W, WT1515/6-W, WT0705-M, WT1515G-M, BTC4-M

2-1-2. Engagement angle

The engagement angle of the chain on the drive sprocket should be at least 180°^Note) . If the engagement angle is too small, chain skipping may occur.

Note) The engagement angle of bottom power drive should be 200° or more.

2-1-3. Wearstrip ends

A distance C, between the center of the sprocket and the end of the wearstrip, basically should be one pitch of the chain.

In addition, the end of the wearstrip faced to driven side should be rounded or chamfered downward in order to prevent the chain from snagging or catching on the wearstrip.

2-1-4. Location of sprockets and wearstrips

See illustration below.

Note) For WT3109-W and BTH16, contact a Tsubaki representative.

Table 6. Backbend radius

Note) For flight types, this varies depending on flight formation and height.

Leave a clearance between the chain and the wearstrip (guide clearance) as indicated below to allow for thermal expansion.

Conveyor guide width (G) = Chain width (X) + Guide Clearance (Gc)

Table 7. Guide Clearance Gc

Note) Coefficient of linear expansion of polyacetal chain ：12 × 10^-5/℃

2-3-1. Wide types (without tab guide attachments)

Wearstrips should be located at equal intervals alternating with sprockets.

Wearstrip spacing are as follows; WT0400 series: 45 mm/WT0700 series and WT1510 series: 50 mm/WT1907 series: 50.8 mm/BTN5: 76 mm/BT6, BT8, WT1500 series, WT3005, WT3835, BT8S, WT2500 series: 76.2 mm (wearstrip width: 25 mm)/WT3086, WT2515 and WT2250: 85 mm/WT3816: 100 mm (wearstrip width: 30 mm)/WT3827 and WT5707: 152.4 mm

2-3-2. Wide types (with tab guide attachments)

(Chains with tab guide attachments ：BTN5-A、WT1505G-K、WT1515G-W、WT1505GTO-K、WT1505GTORN-K、WT2515G-W、WT3005G-K、WT3086G-K、BTC8-A)

Tab guide attachments (to prevent meandering) should be installed so as not to interfere with the wearstrip.

Table 8. A Dimensions [Wide Types (with Tab Guide Attachments)

Chain Type	A
WT1505G-K	44
WT1505GTO-K, WT1505GTORN-K	47
BTN5-A	44
WT2515G-W	45
BTC8-A	44
WT3005G-K	44
WT3086G-K	44
WT1515G-W	31

2-3-3. Wide type (WT0405-W)

In case of a multi strand application, do not make contact with the sides of adjacent strands each other. Refer to the following drawing.

2-3-4. Wide type (WTU3015T-K)

・Layout in straight section

Wearstrips should be located at equal intervals alternating with sprockets.

1) Example of wearstrip installation

3) Layout of side transfer (lap)

When side transfering in a straight section, install the wearstrip along the side of the upstream chain's float-preventive attachment (tab).

2) Layout of drive side straight section

Install a chain wearstrip on the OUT side of the straight section on the drive side of a conveyor with a curved section.

2-3-5. Wide type (for WT3109-W/BTH16)

An example is shown below for reference. Instead of fixing the wearstrip completely to the frame with bolts, provide a clearance with spacers to prevent the plastic rail from floating due to thermal expansion differences.

2-3-6. Mold-to-width type (with tab guide attachments)

Refer to the table below for guide clearance for chains with tab guide attachments. Leave a clearance of around 1 mm between chains when used in multi-strand conveyors.

Table 9. A Dimensions (Mold-to-Width Type with Tab Guide Attachments)

Chain Type	A
WT1505G-M	44
WT1505GTO-M	47
WT1505TOD	53
WT1515G-M50	31
WT1515G-M100	61
WT2505G-M	45
WT2505TOD	45
WT2515G-M	45
WTM2535G-M	44
WT3005G-M	44
WT3086G-M	44
WT3835G-M	45
BTO8-M	44
BTC8H-M	44
BTM8H-M	44

2-3-7. Wearstrip installation for KV series

• ・Recommended wearstrip material is stainless steel.
• ・Secure only one end of the wearstrip to allow for thermal expansion. Also, remember to leave a clearance between wearstrips to allow for thermal expansion.
• ・Take-up must be done to compensate for slack in the chain caused by thermal expansion. Take-up adjustments should be performed after reaching operating temperature.
  Lower temperatures only after loosening take-up.
• ・Black wear dust will be generated. Be sure to clean on a regular basis.

There are two methods of supporting the return-way: “support system using return rollers”, and the “support system using wearstrips”. Examples are shown below.

Precautions:

• 1. Pay particular attention to the ends when connecting conveyors using TOD chain.
• 2. The infeed section of the return wearstrip should be made with a large radius of at least R40.
• 3. Cut the chain so that the catenary section will have an appropriate amount of slack to compensate for expansion and contraction caused by temperature changes. A tensioner or similar device should be used to adjust the chain take-up.

2-4-1. Supported by return rollers

The center distance of the rollers (in the direction of the conveyor width) should be adjusted according to the width of the chain to be used.

(Conveyor side view)

Note)

• Return rollers having an 80 mm diameter or more should be used for WT1907, WT3827 and WT5707.

Refer to the above table 5 for L dimensions.

Plan view of return-way conveyor

2-4-2. Support system using wearstrips

(Conveyor side view)

Note)

• 1. Return rollers having an 80 mm diameter or more should be used for WT1907, WT3827 and WT5707.
• 2. Equal to its backflex radius or more for WT1907, WT3827, WT5707.

Refer to the above table 5 for L dimensions.

2-4-3. Layout in curved section (in case of WTU3015T-K)

In the case of sideflexing conveyance, provide a straight section of 800 mm or more from the drive part to the curve part to secure the catenary on the return-way.

1) Example of wearstrip installation

2) Processing of the entry and exit of the wearstrip

The sections where the curved wearstrip transitions to the straight wearstrip at the entry and exit should be chamfered to prevent the chain from getting caught.

・Layout in curved section on return-way

On both ends of the curved wearstrip on return-way, install return rollers or sliding shoes (TP-C14343T-SD) 50 mm away from the wearstrip to guide the chain.

2-4-4. Layout in curved section (in case of WT3085-C)

Mounting Curved Wearstrips on Carry-Way

Mounting Curved Wearstrips on Returny-Way

(Attachment sliding)

(Top plate sliding)

Important points regarding conveyor design

• 1. Use rollers* in the take-up system
  • ・It becomes easy to take up chain stretch, cut the chain, and adjust the slack (δ).
  • ・A rough guide for the take-up stroke (S) is S = conveyor length × 1%.
• 2. With regard to rollers*
  • ・Select rollers that has the largest possible outside diameter (at least 50 mm).
  • ・The shaft used for rollers must have adequate stiffness.
  • ・The rollers should be freely rotated.
• 3. Because the chain will expand and contract due to changes in temperature, cut the chain so that an appropriate amount of slack is formed in the catenary section, or adjust using tensioners.

  [Reference ：Coefficient of linear expansion of polyacetal chain ：12 × 10^-5/℃]

• 4. In case of forward/reverse bottom drive, idler rollers receive 1.5 times higher tension load than operation tension, consider choosing more rigid shaft or supporting shaft at more than three places.

Important points when using nose bars

• 1. Nose bars must be mounted using rigid bracing. Slack must be kept within 0.5 mm.
• 2. Dimensional tolerance for bending, twisting, etc., of the frame in the direction of the conveyor width must be less than 0.3 mm.
• 3. The position and dimensions of the nose bars, rollers*, and sprockets must be set so that they form an angleα ≦ 30°.
• 4. The chain slides over the nose bar under load levels approaching the maximum working tension. Consequently, SJ-CNO (special polyamide) is recommended when running at high speeds and conveying high loading under dry conditions (no lubrication).

Note) High loading conditions have been taken into account for the design material.

Important points regarding conveyor design

• 1. Use idler rollers in the take-up system.
  • ・It becomes easy to take up chain stretch, cut the chain, and adjust the slack (δ).
  • ・A rough guide for the take-up stroke (S) is S = conveyor length × 1%.
• 2. Select the idler roller that has the largest possible outside diameter (at least 80 mm diameter).
• 3. The idler roller should be freely rotated.
• 4. The shaft used for turn roller A and turn rollers must have sufficient stiffness. (Do not use high-rotation return rollers for these turn rollers.)
• 5. Because the chain will expand and contract due to changes in temperature, cut the chain so that an appropriate amount of slack is formed in the catenary section, or adjust using tensioners.

  [Reference ：Coefficient of linear expansion of polyacetal chain ：12 × 10^-5/℃]

• 6. In case of forward/reverse bottom drive, idler rollers receive 1.5 times higher tension load than operation tension, consider choosing more rigid shaft or supporting shaft at more than three places.

Important points when using nose bars

• 1. Nose bars must be mounted using rigid bracing. Slack must be kept within 0.5 mm.
• 2. Dimensional tolerance for bending, twisting, etc., of the frame in the direction of the conveyor width must be less than 0.3 mm.
• 3. The position and dimensions of the nose bars and turn rollers must be set so that they form an angle α≦ 30°.
• 4. The chain slides over the nose bar under load levels approaching the maximum working tension. Consequently, PLF or SJ-CNO (special polyamide), are recommended when running at high speeds and conveying high loading under dry conditions (no lubrication).

Note) High loading conditions have been taken into account for the design material.

Important points regarding conveyor design

• 1. Select the idler roller that has the largest possible outside diameter (at least 80 mm diameter).
• 2. The idler roller should be freely rotated.
• 3. The shaft used for turn rollers must have sufficient stiffness. (Do not use high-rotation return rollers for these turn rollers.)
• 4. Because the chain will expand and contract due to changes in temperature, cut the chain so that an appropriate amount of slack is formed in the catenary section, or adjust using tensioners.

  [Reference ：Coefficient of linear expansion of polyacetal chain ：12 × 10^-5/℃]

• 5. In case of forward/reverse bottom drive, idler rollers receive 1.5 times higher tension load than operation tension, consider choosing more rigid shaft or supporting shaft at more than three places.

2-8-1. In-line layout of WT0405-W

With a nose bar with a 2.5 mm radius, in-line transfer layout will be possible.

The gap in between can be reduced to 13 mm without mounting a dead plate, which was previously required.

Note) Contact a Tsubaki representative for more information.

2-8-2. In-line layout of WT0700 series

・In-line layout of WT0700 series nose bar

Both conveyor ends can be adjoined in a straight line.
The use of a dead plate helps minimize space in between.

・In-line layout of WT0700 series with nose bar and sprocket

Conveyor ends and sprockets can be adjoined in a straight line.
The use of a dead plate helps minimize space in between.

・In-line layout of WT0700 series with nose bar and WT1500 series sprocket

Conveyor ends and sprockets can be adjoined in a straight line.
The use of a dead plate helps minimize space in between.

2-8-3. In-line layout of WT1500 series and BTN5

The figure below is an example layout. Mounting positions of dead plates varies depending on installation space, etc.

The use of WT1500 and WT1510 series or BTN5 allows layouts in which two conveyors connect head-to-tail.

The width of the dead plate used in the space where the two conveyors abut can be as small as 20 mm.

・In-line layout of WT1500 and WT1510 series nose bar

・In-line layout of WT1515VG-W

By using GTO and TOD or nose bar, right angled corners can smoothly be transferred without the use of dead plates.

・Dimensions for mounting the chains are given below.

Insertion Conveyor (WT1505TOD/WT1500)

Number of teeth	Dimensions mm
	Dp	D	H※	L1※	L2※
24	114.9	61.4	62.2	103.9	10.4
32	153.0	80.5	81.3	104.9	11.4
33	157.8	82.9	83.7	105.0	11.5

Note) The dead-plate gap (marked with ※ in illustration above) will need to be adjusted depending on the objects being conveyed.

Insertion Conveyor (WT2505TOD/WT2500)

・For WT2505TOD-M450

Number of teeth	Dimensions mm
	Dp	D	H※
16	130.2	71.4	72.1
18	146.3	79.5	80.3
21	170.4	91.6	92.5
31	251.1	131.8	132.6

Note) The dead-plate gap (marked with ※ in illustration above) will need to be adjusted depending on the objects being conveyed.

・For WT2505TOD-M750

Number of teeth	Dimensions mm
	Dp	D	H※
16	130.2	71.4	72.1
18	146.3	79.5	80.3
21	170.4	91.6	92.5
31	251.1	131.8	132.6

Note) The dead-plate gap (marked with ※ in illustration above) will need to be adjusted depending on the objects being conveyed.

Discharge Conveyor (WT1505GTO/WT1505GTORN/WT1500)

Note) The dead-plate gap (marked with ※ in illustration above) will need to be adjusted depending on the objects being conveyed.

Roller support reference example

The number of return roller supports must be increased depending on the chain width to receive chain slack.

Note) Additional machining of the flight is required to avoid interference with the flight section.

Reference diagram

The figure below is a preferable layout for transfer plate installation.

Dp：Pitch Diameter

The figure on the right shows how to secure transfer plates with a dedicated cap and a screw.

Having taken thermal expansion into account, secure the screw on the plate in accordance with the guidelines below, which are separated by operating temperature.

• 1) Stable room temperature (20˚C)

  The screws of transfer plates with number 2 and 3 are to be secured in the center of the slot.

  
• 2) Low temperature

  The screws of transfer plates with number 2 and 3 are to be secured nearing the center of the chain.

  
• 3) High temperature

  The screws of transfer plates with number 2 and 3 are to be secured nearing the edge of the chain.