Hem Link Units

Single Link unit Parallel link unit Double motion link unit

Features 1．　Downsized by applying the compression spring method. 　　Conventionally, hem link units for pre-hem processing had been applying extension spring method for returning the bracket. However, OILES succeeded to apply the compression spring method, resulting downsizing in both depth and width of the unit dimension. That greatly contributed to broaden the possibility of hem unit design. 2．　The compression spring method has been applied (Conventionally, extension spring method was mainly applied) for bracket return springs. 　　①Safe and easy installation/removal of the spring (Unnecessary to worry about finger-pinching accidents). 　　②Spring durability has been improved. 　　③Initial pressure adjustment of the spring became available; therefore, adjustment of the bending edge can be easily conducted. Refer to the figure below. 3．　ISO springs are applied for return springs for improvement of availability. 4．　Selection of spring types is available in accordance with weights of a bending edge (including bracket weight). 5．　Selection from three types of moving methods is available. 　　[Single link, parallel link, double-motion (single + parallel link)] 6．　Selection of the installation face type is available in accordance with installation method of a bending edge. 7．　The unit has a double motion link that uses a parallel link mechanism for pre-hem process and a single link mechanism for clearance of the bending edge. 8．　The unit has the return force enforcing unit for the double motion link as an option. 9．　Selection of a driver is available in accordance with the unit type, height, cam type, and installation position (RH/LH) of the position return. 10. Maintenance of the single link bending edge (including a corner link) became easier. By removing a stopper, 90 degree rotation of the bracket is possible as shown in figure below.

Downsizing

By changing the return spring force to the compression spring method, durability of the spring can be improved and a compact design can be achieved.

Structure of the compression spring method

The unit uses a screw for applying the initial load of the compression screw, resulting in good installation/removal capability. In addition, adjustment of the initial load is available. Applying two screws prevent loosening of the screws. By taking above measures, safer operation is achieved compare to conventional extension spring method. The following figure shows the general outline of the inner structure of the bracket and the downsizing method of the unit. Comparing to the extension spring method, if the spring is damaged, die damage is drastically reduced.

Entrance angle of pre-hem bending edge

●Entrance directions of the pre-hem bending edges for each link are as follows. For details, refer to the figures on the next page.

Returning spring

●For return springs, ISO springs are used. ●The following table shows the settings of the applying springs.

Note : Values in [ ] are required spring quantities.

Type Feature Applicable spring Initial load (N) Final load (N) Single link Standard type Flange type TJH32-139 (Heavy Duty) 1530.0 [2] 4530.0 [2] TJM32-139 (Medium Duty) 793.0 [2] 2346.0 [2] TJL32-139 (Light Duty) 474.0 [2] 1401.0 [2] Corner link type TJL32-115 (Light Duty) 340.5 [1] 905.9 [1] Parallel link Standard type Keyed type TJH32-178 (Heavy Duty) 1410.0 [2] 2120.0 [3] 4680.0 [2] 7130.0 [3] TJM32-178 (Medium Duty) 733.0 [2] 1099.0 [3] 2429.0 [2] 3643.0 [3] TJH32-229 (Heavy Duty ) 1485.0 [2] 5950.0 [3] TJM32-229 (Medium Duty) 768.0 [2] 3080.0 [2] Double motion link (0° and 15° ) and return force intensifier TJH32-178 (Heavy Duty) 873.0 [1] 1746.0 [2] 2845.0 [1] 5670.0 [2]

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