2-1-1. Location of sprockets and wearstrips

[drive ]

For plastic modular chain (mold to width)

[Driven Side ]

When using an idler wheel (no teeth) for chains with top plates

Plastic top chain
Stainless steel top chain

Plastic block chain
Plastic Universal Chain

Plastic modular chain (mold to width)

Note)

• 1. DP：Pitch Diameter
• 2. Adopt the pitch circle diameter of sprocket having the equivalent number of teeth to the idler wheel.

2-2-1. Carry-Way Support

• 1. The guide width Gw should be about 2 mm wider than the width of the base chain hinge. (Refer to fig. 1) (Refer to 2-2-4. for guide width Gw.)
• 2. When multiple strands of chains are traveling in opposite directions, or in the same direction but at different speeds, use T rails so that the chain top plates do not make contact with each other (Refer to fig. 2).
• 3. When multiple strands of chains are traveling in the same direction at the same speed, the recommended gap between the chain top plates is 1.4 to 3 mm (Refer to fig. 3).
• 4. The use of wearstrips is recommended even though no wear will occur with the frame itself.
• 5. Considering wear, the wearstrip must be at least 3 mm thick.

Fig. 1. Chain carry-way support

Fig. 2. When multiple strands of chains are traveling at different speeds

Fig. 3. Multiple strands having the same speed

2-2-2. Wearstrip When Using Chains with Float-Preventive Tabs

2-2-3. Mounting Straight Wearstrip

・PR rails, PH rails and flat rails

Use a screw to attach only one end of the wearstrip to the frame and leave an appropriate gap at the joint to allow for thermal expansion.
(Clearance for PH rails ：3～5mm)

Note)

• 1. Coefficients of linear expansion
  Plastic rail (P rail) 、PLF rail ：20×10^-5/℃
  M rail ：9×10^-5/℃
• 2. Operating temperature range
  Plastic rail (P rail) 、PLF rail ：-20～60℃
  M rail ：-20～80℃
• 3. Do not use in environments where wearstrip components will be exposed to steam.
• 4. Refer to section 2-11 below for rails for KV series.

・Mounting long straight wearstrip (extruded wearstrips such as Z, T, L, and flat)

[When the conveyor length is long ]

Assuming that these wearstrips are installed in 1-meter units, a clearance should be left between wearstrips to prevent chain sag as shown in the illustration below. (Clearance between long straight wearstrips: 10 mm per meter)

Note) If more than 1 meter, apply the coefficient of linear expansion to calculate the clearance dimension.

[When the conveyor length is short ]

If both ends of the wearstrip are secured using small pan head screws, the wearstrip will warp (become rippled) due to the difference in coefficient of thermal expansion between the wearstrip and metal frame. Attach only one end of the wearstrip using a small pan head screws.

2-2-4. Guide Clearance for Chain and Wearstrip Inner Gap (Straight Sections)

[Plastic top chain/Stainless steel top chain ]

[Plastic block chain ]

2-3-1. Design for Curved Wearstrip

・Design for Head End

Install end plates on the straight wearstrip closely in front of the head end of the curved wearstrip.

・Design for Tail End

Install end plates on the straight wearstrip closely after the tail end of the curved wearstrip. The edge of the wearstrip should be chamfered to prevent interference with the chain.

2-3-2. Chain and Wearstrip Cross-Sections

Sprocket section is identical to TOSP.

Note) See here.

Note) See here.

Sprocket section is identical to TOS.

Note) See here.

Note) See here.

Note)

• 1. The use of corner discs is recommended with TPUSR, TPUN555, TPUN550-LH, TPUN535-LH, TP-UB36, TP-50UNS, and TP-50UNS-D76 chains.
• 2. Special magnetic curved plastic rails should be used with TTUP(T)-M and TTUPM838H.
  Contact a Tsubaki representative for product details.

• ・Return rollers support the top surface of the chain on the return-way.
• ・When using return rollers, check the backflex radius of chains in Table 11. The radius of the return roller must be greater than the backflex radius of the chain. However, as long as the backflex radius is less than around 300 mm, return rollers can be used by keeping the chain slack low. These conditions do not apply to roller tables or accumulation chains.
• ・When using plastic top chain, the ratio of the inner diameter to the outside diameter of the return rollers should be 1:4 to ensure smooth rotation of rollers. In addition, TP-IR18 and TP-IR60 Return Rollers which use a soft material on the outer surface of the roller (only for dry conditions ); and TP-C121963RNTRR, TP-C121966RNT-RR, TP-C121967RNFT-RR, TP-C121970RNFT-RR, TP-RR61544-RB, TP-RR62032-RB, TP-RR62044-RB, TP-RR30850, TP-RR41050 (for dry and wet conditions ) Return Rollers are effective in improving rotational performance.

Note) Use highly rotational return roller when the chain speed is less than 50 m/min.

Wearstrips should be positioned to make contact evenly across the chain width, taking into account wear on the chain-conveying surface. The construction should be such that extraneous matter, dirt, etc., falls through easily.

Secure a 20mm-dia. polished (cold-finished) steel bar to the frame and attach the sliding shoe(s) by snapping them onto the steel bar. Use a collar or other hardware to prevent the sliding shoes from shifting laterally.

With the steel bar serving as a pivot, the sliding shoes will rock up and down with the movement of the chain.

The ★ mark in the illustration above indicates the location of a hole used to connect multiple sliding shoes horizontally in tandem to span a multi-strand conveyor.

2-5-1. Design for Return-Way Curved Wearstrip

Position return rollers or sliding shoes (TP-C14343T-SD) at both ends of the curved wearstrip to guide the chain. Location of the return rollers or sliding shoes should be 50 to 150 mm away from the base.

Conveyor side cross-section

2-7-1. Using Wearstrips

・Round bar wearstrip

・Flat plate wearstrip

2-7-2. Using Corner Discs

・Curved section

・Corner disc mounting

・Elevator conveyance curved sections

The corner disc and the section of chain where it engages or disengages with the corner disc must be in the same plane so that the chain does not derail from the corner disc.

2-8-1. Sprockets and Corner Disc for Horizontal Conveyance

Horizontal conveyance

(Explanation of symbols )

• ・D_O：Outer diameter of horizontal conveyance sprocket (corner disc) (mm)
• ・R：Sideflex radius of chain (mm)
• ・R₁：Inside radius of wearstrip for outside of chain (mm)

Note)

• 1. For horizontal conveyance, a mechanism must be set up to absorb chain elongation.
• 2. In horizontal conveyance, chain may move up and down slightly as the chain wraps around the sprocket and corner disc.

2-8-2. Shaft-Mounted Sprocket and Corner Disc

・Sprocket mounting for horizontal conveyance

• 1. Press fit TP-C12773T-HB hub with keyway onto TP-C12781LT-SPR sprocket for horizontal conveyance.
• 2. Secure sprocket to 25-mm-dia. shaft (with key), and finally, install M8 set screw.

・Corner disc mounting

Wearstrip layout

Layout will vary depending on the installation space, but the following examples can be used for reference.

When using stainless steel top chain TO type, please check the dimensions of the chain when placing the wearstrip by referring to the example below.

・Wearstrip layout example (1)

・Using TOSP1143 and corner sprocket

The point where the chain first makes contact with the curved wearstrip and the area immediately after the point where the chain ceases contact should be chamfered to prevent the chain from snagging or catching.

Note) Please contact us if you are interested in PR-PH545-W.

・Wearstrip layout example (2)

・Using TORP1143 and corner sprocket

The point where the chain first makes contact with the curved wearstrip and the area immediately after the point where the chain ceases contact should be chamfered to prevent the chain from snagging or catching.

Note) Please contact us if you are interested in PR-PH1035-W.

・Wearstrip layout example (3)

・Using TORP1143 and curved wearstrip

The point where the chain first makes contact with the curved wearstrip and the area immediately after the point where the chain ceases contact should be chamfered to prevent the chain from snagging or catching.

Note) Please contact us if you are interested in PR-PH1035-W.

Precautions on conveyor layout

A take-up mechanism must be installed to absorb elongation resulting from temperature changes or wear elongation of the conveyor

See example below for reference:

2-10-1. Side Transfers

This is the easiest and the preferred method of product transfer. Two parallel chains are positioned side-by-side and guide rails are used to transfer the products.

• 1. The two chains must be positioned at the same height, or the infeed chain must be positioned slightly lower than the outfeed chain.
• 2. The angle and shape of the guide rails should be adjusted to provide a smooth product flow.

2-10-2. Dead-Plate Transfers

The dead-plate transfer method is used when the layout of the flow system demands that two chains be placed at right angles to each other.

• 1. To ensure smooth transfer, the dead-plate should be positioned slight lower than the outfeed chain and slightly higher than the infeed chain.
• 2. The edges of the dead-plate should also be slightly chamfered.
• 3. The outfeed chain will be moving up and down as a result of chordal action of the driven side. Sufficient care should be taken to install the dead-plate properly to avoid contact or interference.

2-10-3. Turntable Transfers

This method uses a turntable for product transfer.

Height of the turn table

• Turntables should be placed slightly lower than the infeed chain and slightly higher than the outfeed chain.

The outer circumference of the turn table should be chamfered.

The center of the turntable is, in general, aligned near the centers of the drive and driven sprockets. To avoid the effects of chordal action, move the turntable forward by the amount of center position (C), so it will not be affected by up-and-down movement and will be more stable.

2-11-1. Use at Ambient Temperature

• 1. The recommended wearstrip materials are steel or steel with hard chrome finished plating with buff or cold rolled stainless steel.
• 2. Black wear dust will be generated. Be sure to clean on a regular basis.
• 3. Start up slowly and stop slowly.

2-11-2. Use at High Temperature

• 1. Recommended wearstrip material is cold-rolled stainless steel.
• 2. 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.
  (Reference: Coefficient of linear expansion for SUS304 is ...1.8×10^-5/℃)

Example: Securing stainless steel wearstrips, and leaving space between wearstrips

Figure is for types TTP-KV,TPS-KV, TTUP-KV and TPU-KV. For RSP35(40•60)-KV, see the above table 10.

Clearance (S) for wearstrip 500 mm in length

Operating temperature ℃	50 ～ 100	100 ～ 150	150 ～ 200	200 ～ 250
Gap S	1.5	2	2.5	3

• 3. Standard steel sprockets can be used for ambient temperatures below 150°C.
  Special sprockets must be used at temperatures higher than 150°C. Contact us for more information.
• 4. Spacing between chains when multiple strands are used is shown below.
  
• 5. 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.
• 6. Black wear dust will be generated. Be sure to clean on a regular basis.
• 7. Start up slowly (using inverter control) and stop slowly