The Karl Tränklein BRM 500 is a book binder — sometimes referred to as a book rounding machine or spine rounder — used to shape the spines of book blocks into the characteristic curved profile required in hardcover and case-bound book production. Karl Tränklein is a German manufacturer with a long-standing reputation in bookbinding machinery, producing equipment for the finishing and binding stages of book manufacturing.
This 1972 machine is designed specifically for rounding thread-sewn and perfect-bound book blocks quickly and uniformly. A key operational feature is the handwheel adjustment system, which allows the operator to set the correct position for each book thickness using a calibrated scale. This makes format changes rapid and straightforward, keeping the machine economical even when handling short or very short print runs. A foot brake is also fitted to bring the machine to a quick stop during those changeovers, minimising downtime between jobs.
In terms of capacity, the BRM 500 accommodates a maximum working width of 540 mm and handles book block thicknesses ranging from 0 to 100 mm. Output is rated at between 400 and 600 blocks per hour, reflecting a solid throughput for a machine of this size and vintage. Two storage tables are included as accessories.
The machine has a footprint of 120 × 100 cm, stands 120 cm tall, and weighs approximately 390 kg. Despite its robust, sturdy construction, it is noted for quiet operation — a practical advantage in a busy bindery environment. This used example is located in Germany and is available for inspection there.
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