The present application discloses a winding needle sleeve, a battery unit, a battery, a power-consuming device and a winding device. A wall of the winding needle sleeve is provided with a through slot extending through the wall. The through slot extends from one end to the other end of the winding needle sleeve, so as to allow expansion or contraction of the winding needle sleeve in a radial direction. The technical solution provided by the present application can solve the problem in the prior art that an electrode assembly collapses due to expansion and contraction thereof, resulting in wrinkling of a surface of the electrode assembly and the phenomenon of lithium deposition, thus causing potential safety hazards.

A core insert (103) for insertion into a core (700) of a roll (500, 600) of material and a hand tool using the core insert for applying the material to a surface (1100). The insert (103) includes a gripper sleeve bearing (7) rotatably connected to a spindle hub (101) attached to an axle shaft (1). The bearing (7) has tapered axial splines (104) extending away from center of the bearing (7) configured to grip the inner surface of the core (700). The hand tool includes the core insert (103) and an axle shaft (1), a handle shaft (2) and a shaft connector (9). The axle shaft (1) is insertable into the core (700) with the bearing (7) inserted into the (700) core to releasably and frictionally engage the core (700) so that the roll (500, 600) is rotatable about the axle shaft (1) along with the bearing (7).

A core insert (103) for insertion into a core (700) of a roll (500, 600) of material and a hand tool using the core insert for applying the material to a surface (1100). The insert (103) includes a gripper sleeve bearing (7) rotatably connected to a spindle hub (101) attached to an axle shaft (1). The bearing (7) has tapered axial splines (104) extending away from center of the bearing (7) configured to grip the inner surface of the core (700). The hand tool includes the core insert (103) and an axle shaft (1), a handle shaft (2) and a shaft connector (9). The axle shaft (1) is insertable into the core (700) with the bearing (7) inserted into the (700) core to releasably and frictionally engage the core (700) so that the roll (500, 600) is rotatable about the axle shaft (1) along with the bearing (7).

A ribbon take-up hub for a printer is disclosed. The ribbon take-up hub comprises a centre hub configured to be coupled to a rotatable component of the printer. The centre hub comprising a button. Further, one or more arc shaped blocks are positioned in proximity to the centre hub, and a plurality of tension holders are attached to the centre hub. Further, upon pressing of the button, the plurality of tension holders retracts inside the centre hub to facilitate placement and winding of a ribbon between the plurality of tension holders and the one or more arc shaped blocks. Further, upon releasing the button, the plurality of tension holders extends from the centre hub to clamp the winded ribbon between the plurality of tension holders and the one or more arc shaped blocks.

A ribbon take-up hub for a printer is disclosed. The ribbon take-up hub comprises a centre hub configured to be coupled to a rotatable component of the printer. The centre hub comprising a button. Further, one or more arc shaped blocks are positioned in proximity to the centre hub, and a plurality of tension holders are attached to the centre hub. Further, upon pressing of the button, the plurality of tension holders retracts inside the centre hub to facilitate placement and winding of a ribbon between the plurality of tension holders and the one or more arc shaped blocks. Further, upon releasing the button, the plurality of tension holders extends from the centre hub to clamp the winded ribbon between the plurality of tension holders and the one or more arc shaped blocks.