Panasonic KV-S1037 Operating Manual page 59

Depending on the paper type or operating environment (temperature, humidity, etc.), the unit may not feed the documents
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properly.
When paper weight is more than 209 g/m² (55 lb.): 5 sheets (A4, High-quality woodfree paper)
When installed the mixed batch card guide: 20 sheets (80 g/m² [21 lb.], High-quality woodfree paper)
For details, see "8.3 Replacing the Rollers" (page 45).
*8
9.6 Specifications
59