U.S. TSUBAKI FREE FLOW CHAIN
ENGINEERING INFORMATION
(3) Important points when handling steel guide rail • When cutting the guide rail with steel rail 1) Cut anywhere other than the central portion or screwed portions of the rail. 2) Insert lock screws into the steel rail and inner rail along with the inner rail and main rail at 0.6 ~ 1.2 in. from the cut end. 3) Machine all parts individually. 4) Completely remove all burrs before reassembly. Note: Use screws according to Table 9d on page B-60 when reassembling the conveyor. • When connecting the rail After connecting the rail, put small chamfers on the mating faces of the steel rail in both directions where steps occur. These prevent the chain rollers from getting caught. vi) Transferring objects between conveyors. To convey pallets in a stable condition at the transfer portion of the conveyor, install a roller between the two conveyors or the shafts of the sprockets (see Fig. 7). Be sure that the dis- tance l from the ends of the rail to the roller that supports the pallets is less than 1/2.5 times the pallet length in the conveying direction. Figure 7–Install a roller as shown for a straight line transfer
Figure 8–Slack tolerance
Figure 9–Take-up arrangement
Figure 10–Take-up arrangement for limited space
viii) Maximum conveyor length. DOUBLE PLUS ® Chain operates well on conveyors with lengths not exceeding 50 ft. When conveyor distances are greater than 50 ft., make several shorter conveyors in line. If you require one continuous system longer than 50 ft., consult U.S. Tsubaki. ix) For DOUBLE PLUS ® Chain with Snap Covers. When using the arrangement as shown in Fig. 11, be aware that the sprocket cannot engage the chain from the top surface of the snap covers. When bending the chain toward the snap cover side, do not bend beyond the R dimension of the plastic return guide (see page B-46). Snap covers and installation are shown in Figs. 12 and 13.
Figure 11–Take-up arrangement for limited space for DOUBLE PLUS ® with Snap Covers
vii) Take-up. The amount of take-up l = (L • 0.02) + marginal length (0.02 = Allowable chain wear elongation 2%) Allow for some sagging (up to 10% of the span) in the chain on the bottom of the driver sprocket. Adjust the take-up so that the slack does not exceed the values in Table 9f. (see Fig. 8.) The total arc of contact between the chain and sprocket should be more than 130°. If take-up cannot be set up as shown in Fig. 9 due to space limitations, refer to Fig. 10.
Figure 12–Snap covers for outer and inner links
Table 9f. Chain Slack for DOUBLE PLUS ® Normal slack
Maximum slack
Chain size
inches
inches
C2030 C2040 C2050 C2060 C2080
.10
2.95 4.13 4.72 5.90 7.48
Figure 13–Proper installation of snap covers
1.38 1.57 1.97 2.56
B-61
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