31results about How to "Sensitive transmission" patented technology

The transmission structure of a sewing machine provided by the present invention includes: a rotary hook mechanism for being installed under the needle plate; the rotary hook mechanism includes a third rotary hook gear, a rotary hook shaft, a gear cover and a rotary hook seat; The hook shaft penetrates into the third rotary hook gear and is fixedly connected with it, and the top of the rotary hook shaft is also driven to connect the rotary hook; the middle part of the gear cover is provided with an installation cavity, and the side wall of the gear cover is provided with an opening; The third rotary hook gear and the rotary hook shaft are installed in the installation cavity; the gear cover has an outer wall that fits with the inner wall of the rotary hook seat. The invention improves the structure of the gear cover, reduces the structure of the gear cover, and further reduces the size of the hook seat; reduces the size of the machine head, which can process specific products with smaller sizes; and does not need to replace the entire machine during maintenance. seat, only need to disassemble the first rotary hook mechanism separately, and its replacement and maintenance are more convenient.

The invention discloses a double-cone friction transmission self-adaptation automatic speed changing spindle assembly which comprises a transmission shaft, a slow-gear transmission mechanism and a mechanical intelligent self-adaptation speed changing assembly. Friction faces of drive friction discs and friction faces of driven friction discs of the mechanical intelligent self-adaptation gear changing assembly are in double-cone-face friction transmission. According to the double-cone friction transmission self-adaptation automatic speed changing spindle assembly, the friction discs are adopted to form a separating and combining structure, the beneficial effect of the sensitive response is achieved, and the axial size is small; meanwhile, the structure that the radial sections of the friction faces are trapezoidal annular protrusions are embedded in annular grooves is adopted, double cone faces are formed, the friction faces are disconnected, and therefore coaxiality of the drive friction discs and the driven friction discs is ensured easily, the friction faces are easily enlarged, and good transmission is ensured under the limited elasticity conditions; and sensitivity of separating and combining is easily ensured, transmission precision is improved, and the assembly is suitable for the field of electric vehicles.

The invention relates to a gear rack driving device for a movable bridge, which is suitable for a single-span or double-span type vertically pivoted movable bridge. A gear rack transmission mechanism is used for realizing the opening and closing of the movable bridge; one end of a single-side rack is articulated with the side face of a movable span of the bridge; a motor drives a driving gear through a reduction gearbox, and the driving gear drives a driven gear so as to drive the single-side rack to stretch, thereby driving the opening and closing of the bridge; a polishing wheel rotates passively so as to play a supporting role; the gear rack transmission mechanism forms a transmission case which is fixed with a bridge upright column through an outer shell by virtue of bolts, a transmission case formed by an inner shell is articulated with the outer shell and can rotate around a plane perpendicular to the bridge upright column, and the inner shell is provided with a rack guide device so as to enable the rack to be always perpendicular to the center line of a transmission gear; the guide device can ensure a perpendicular normal meshing state of a gear rack and can ensure the transmission accuracy; and the opening and closing of a single span can be completed by two gear rack driving devices together. The gear rack driving device has the advantages of simple and compact structure, light weight, high rigidity, sensitive transmission, easy manufacturing, low cost, high forward efficiency and reverse efficiency, convenient arrangement, and the like.

The invention belongs to the technical field of printing equipment, and particularly relates to a paper feeding system of a printing press. The paper feeding system comprises a paper separation assembly, a first guide roller (4), a second guide roller (5), an ultrasonic double sheet detection component (10) and a conveying assembly (6). The paper separation assembly, the first guide roller (4), the second guide roller (5) and the conveying assembly (6) are arranged in the conveying direction of paper sheets (1) in sequence. The paper separation assembly enables the paper sheets (1) to be separated and conveys the paper sheets (1) to the first guide roller (4), the first guide roller (4) conveys the paper sheets (1) to the second guide roller (5), the second guide roller (5) conveys the paper sheets (1) to the conveying assembly (6), the conveying assembly (6) conveys the paper sheets (1) to the printing press (8), and the ultrasonic double sheet detection component (10) is arranged between the second guide roller (5) and the conveying assembly (6). The paper feeding system can effectively avoid the phenomenon that a plurality of paper sheets are conveyed together, and avoid paper sheet waste and printing faults.