Abstract: The present disclosure relates to email synchronization methods and electronic devices. In one example method, an electronic device obtains an email identifier of an email. The electronic device sends, to a server, a first request including the email identifier. The electronic device receives a first response from the server and extracts the email and the structure information from the first response. The electronic device determines object identifiers of objects in the message body based on the structure information. The electronic device sends a second request to the server if information of a first object in the message body fails to be downloaded, where the second request includes the email identifier and an object identifier of the first object. The electronic device receives a second response from the server and extracts the information of the first object from the second response.

Abstract: An electric roll-up limit device includes a tube coupled by a tube rotor to an electric motor. The tube rotor contains a rocker bar that extends from the tube and activates a lower limit switch when a sheet of material is fully unrolled from the tube. A base below the tube rotor contains a pull bar cavity and an actuator device with a rotatable support frame and a rotatable actuator lever. The support frame supports the actuator lever and prevents it from rotating in one direction to activate an upper limit switch. A spring couples the rotation of the support frame and the actuator lever. When the sheet is fully rolled onto the tube, the pull bar cap retracts into the pull bar cavity and butts against the support frame. This causes the support frame to release the actuator lever, which then rotates to activate the upper limit switch.

Abstract: An electric roll-up limit device includes a tube coupled by a tube rotor to an electric motor. The tube rotor contains a rocker bar that extends from the tube and activates a lower limit switch when a sheet of material is fully unrolled from the tube. A base below the tube rotor contains a pull bar cavity and an actuator device with a rotatable support frame and a rotatable actuator lever. The support frame supports the actuator lever and prevents it from rotating in one direction to activate an upper limit switch. A spring couples the rotation of the support frame and the actuator lever. When the sheet is fully rolled onto the tube, the pull bar cap retracts into the pull bar cavity and butts against the support frame. This causes the support frame to release the actuator lever, which then rotates to activate the upper limit switch.