Binding unit for binding sheets in adherence to a binder

Abstract

A binding unit binds sheets with a binder having an electric heater and electrodes for supplying electric current to the electric heater. The binding unit includes a container and an inner lid. The container has an insertion opening at one end through which the binder is inserted, and electrode terminals at the opposite end which come into contact with the electrodes of the binder. The inner lid is openable and provided in the container between the insertion opening and the electrode terminals. It assumes a closed position covering the electrode terminals when no binder is loaded in the container, and an open position allowing the electrodes of the binder to come into contact with the electrode terminals and at the same time supporting one side of the binder when loaded in the container. Consequently, when no binding operation is underway, the inner lid serves to prevent foreign material from dropping down onto the electrode terminals; and, when a binding operation is carried out, the binder is stably positioned in the container by the support of the inner lid, ensuring that the electrodes of the binder are securely in contact with the electrode terminals.