Please select the most similar patent number from A, B, C and D. Which number is?
A thumbwheel shirring head (10), comprising a plurality of thumbwheels (5) evenly distributed around a shirring rod (11). Rotation axes of all the thumbwheels (5) are arranged in a common plane perpendicular to a casing feeding direction; the thumbwheels (5) are designed to be suitable for performing planetary rotation about an inner hole enclosed by the thumbwheels together while synchronously rotating about the rotation axes thereof toward the casing feeding direction; a plurality of thumbwheel teeth (13) is evenly distributed on the periphery of each thumbwheel (5); tooth top leading edges (18) of the thumbwheel teeth (13) of each thumbwheel (5) are designed to be suitable for being squeezed into a space of a casing so that the casing forms a thread line; a continuous thread line is formed when the tooth top leading edges (18) of the thumbwheel teeth (13) of every two adjacent thumbwheels (5) are connected; tooth fronts (16) of the thumbwheel teeth (13) of each thumbwheel (5) are inclined forward in the circumferential rotation direction of the thumbwheel. By means of the thumbwheel shirring head, the shirred casing is not easy to be loosened and disjointed, so that casing pipes can have better quality and are more uniform and tight.
A: A multi-surface container steering device, comprising a support (2); a first shaft (3) that can rotate around the axial direction thereof and that is provided in the support (2); a thumbwheel (4) that is fixedly provided on the first shaft (3); a cam (5) that is fixedly provided on the support (2) and that is located below the thumbwheel (4); and a cam curve groove (6) that is provided on a side surface of the cam (5) facing the thumbwheel (4). The device further comprises a first connecting assembly that is fixedly connected to the thumbwheel (4) or the first shaft (3); a second shaft (7) that can rotate around the axial direction thereof and that penetrates the first connecting assembly; a second connecting assembly that is fixedly connected to one end of the second shaft (7) and that is used for carrying a multi-surface container (1) and also for abutting against at least one side surface of the multi-surface container (1); and a third connecting assembly that is fixedly connected to the other end of the second shaft (7) and that is partially located in the cam curve groove (6), the third connecting assembly being used for driving the second shaft (7) to rotate around the axial direction thereof under the action of the cam curve groove (6) along with the rotation of the second shaft (7) around the axial direction of the first shaft (3). Thus, the problem of orientation of the multi-surface container (1) before filling is effectively solved.
B: A ray machine focus adjustment mechanism for a micro projector comprises a focusing lever (2) for adjusting the focus, a connector (3), a guide column (4) with the surface provided with outer threads, and a trackwheel (5) extending to the outside of the projector body and being located at a focusing mark. Inner threads fitting the outer threads on the surface of the guide column (4) to form a thread-screw transmission mechanism is disposed in the trackwheel (5). The connector comprises two hollow cylinders having axes perpendicular and orthogonal to each other. One of the hollow cylinders sleeves the focusing lever (2) and is fixedly connected to the focusing lever. The other hollow cylinder is fixedly connected to a part, without the outer threads, of the guide column (4) by insertion and gluing. Therefore, the focus of the gear-free ray machine only with an exposed lever is adjusted.
C: Disclosed are a hand-clamping device for continuously sheathing and compressing sausage casings and an automatic sausage casing sheathing and compressing machine, comprising an air cylinder bottom plate (7). A B clamp base (6) and an air cylinder base (8) are arranged on a top portion of the air cylinder bottom plate (7). Gears (9) are installed on the B clamp base (6) via gear shafts (15). The gears (9) are further provided with a left rocker arm (12) and a right rocker arm (1). The left rocker arm (12) and the right rocker arm (1) are both provided with an air-replenishing clamp rotation pin (2) and an air-replenishing clamp limiting plate (10). The other sides of the left rocker arm (12) and the right rocker arm (1) are provided with a proximity switch base (4). Top portions of the left rocker arm (12) and the right rocker arm (1) are provided with a first clamping sheet (22) and a second clamping sheet (24). In the hand-clamping device for continuously sheathing and compressing sausage casings and the automatic sausage casing sheathing and compressing machine, when an air cylinder (5) pushes the left and right rocker arms to be closed by means of a Y-shaped connector (3), an air-replenishing clamp arm (13) is driven to be closed, a groove exactly aligns with a circle of vent holes on a side wall of a piston valve, such that a sheathing and compressing rod is inflated without air leakage, thereby guaranteeing the stability of sausage casing inner air pressure; and the sheathing and compressing rod is firmly clamped, a piston side wall is annularly sealed, and a circle of small holes on the piston side wall are inflated without air leakage.
D: A dial wheel adjustment mechanism (20), a remote controller (30) and an unmanned aerial vehicle, the dial wheel adjustment mechanism (20) comprising: a base (11), at least one reset rotor (12), an elastic reset member (13) and a dial wheel assembly (14). The base (11) is provided thereon with a mounting post (111) and a limiting post (112), the reset rotor (12) and the dial wheel assembly (14) being rotatingly disposed on the mounting post (111). The dial wheel assembly (14) is provided with at least one transmission portion (143); the transmission portion (143) is used for driving the reset rotor (12) to rotate when the dial wheel assembly (14) bears an external force and rotates; the elastic reset member (13) is used for causing the reset rotor (12) to drive the dial wheel assembly (14) to reset after the external force is removed. In a natural state in which no external force is applied, the distance from the limiting post (112) and the transmission portion (143) to the reset rotor (12) on the circumferential direction of the mounting post (111) is not greater than a preset distance. By means of said structure, when the reset rotor (12) is in a reset position, the free rotation margin of the dial wheel assembly (14) is controlled to be within an allowable range, thus increasing the accuracy of adjustment of the dial wheel assembly (14). Further, when applied in a remote controller of an unmanned aerial vehicle, the accuracy in angle adjustment of a cradle head is increased.
Answer: C