Paper pressing device return mechanism of paper cutting machine
Technical Field
The invention relates to paper cutting equipment, in particular to a paper pressing device return mechanism of a paper cutting machine.
Background
When the paper cutter performs paper cutting, the paper on the paper feeding table is pressed by the paper pressing device, and then the cutter is controlled to act for cutting the paper, so that the paper is cut, and the paper is cut by the Chinese patent literature (publication day: 2018, 3, 23, publication number:
CN 207127967U) discloses a spring return device of a paper pressing device, which comprises a frame, a paper feeding platform is arranged on the frame, a paper pressing device is arranged above the paper feeding platform, two ends of the paper pressing device are respectively connected with a connecting rod, a pair of levers are arranged on the frame and below the paper feeding platform, the middle parts of the levers are hinged on the frame, a hydraulic cylinder is arranged on the frame, one end of each lever is hinged with the lower end of each connecting rod, the other end of each lever is hinged with a piston rod of each hydraulic cylinder, and the spring return device is characterized in that a pair of springs are arranged in the frame above the paper pressing device, one ends of the springs are connected with a screw rod, the other ends of the springs are arranged on a spring mounting seat, the screw rod is arranged on the frame, a chain is connected on the spring mounting seat, the chain is wound on a chain wheel, the chain wheel is arranged on the frame above the paper pressing device and is coaxially connected with a sector gear, and the end of the transmission chain is connected with the paper pressing device.
The defects of the structure are that: the sector gear is required to be coaxially arranged on the chain wheel, and a transmission chain is additionally added to realize the connection of the sector gear and the paper pressing device, so that the structure is complex, the production and the assembly are troublesome, and the later maintenance and adjustment are inconvenient.
Disclosure of Invention
In view of the shortcomings of the background art, the technical problem to be solved by the invention is to provide the paper pressing device return mechanism of the paper cutting machine, which has the advantages of simple structure, reasonable design, capability of amplifying the resilience force of the elastic return assembly and effectively improving the stability of the action and the service life of the elastic return assembly.
For this purpose, the invention is realized by adopting the following scheme:
paper pressing device return mechanism of paper cutter has the paper pressing device, paper pressing device is connected its characterized in that with lift drive assembly: the paper pressing device is connected with one end of a return chain, the other end of the return chain is connected with an elastic return assembly, a cam is arranged above the paper pressing device, and the cam is connected with the return chain.
And the periphery of the cam is provided with a sprocket which can be meshed with the return chain.
The return springs are provided with a pair, one ends of the return springs are connected with the screw rods, the other ends of the return springs are arranged on the spring mounting seats, the screw rods are arranged on the frame, and the return chains are connected with the spring mounting seats.
By adopting the technical scheme, the invention has the advantages that: by arranging the cam, the structure of matching the previous chain wheel and the sector gear is integrated on one cam, and the transmission connection of the paper pressing device and the elastic return assembly can be realized by only one return chain, so that the action is smoother and smoother, the structure is effectively simplified, and the production and the assembly as well as the later maintenance and adjustment are facilitated; and the required elastic magnification of the elastic return component can be obtained by designing the shape of the cam.
Drawings
The invention has the following drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a partial enlarged view of fig. 1 at the point a.
Description of the embodiments
As shown in the figure, the paper pressing device return mechanism of the paper cutting machine disclosed by the invention is provided with the paper pressing device 1, the paper pressing device 1 is connected with a lifting driving assembly, the lifting driving assembly comprises a connecting rod 7 arranged at two ends of the paper pressing device 1, a pair of levers 9 are arranged on a frame and below a paper feeding platform 8, the middle parts of the levers 9 are hinged on the frame, the connecting rod 7 and the levers 9 are symmetrically arranged so as to realize the technical effect of stably moving the paper pressing device 1, and the lower end face of the paper pressing device 1 is kept flush with the upper end face of the paper feeding platform 8 so as to more accurately flatten paper on the paper feeding platform 8. A hydraulic cylinder 10 is arranged below the lever 9, one end of the lever 9 is hinged with the lower end of the connecting rod 7, and the other end of the lever 9 is hinged with a piston rod of the hydraulic cylinder 10. When the piston rod of the hydraulic cylinder 10 is jacked up, the lever 9 on the left side and the right side of the hydraulic cylinder are driven to move around the fulcrum of the hydraulic cylinder, the lever 9 drives the connecting rod 7 to move downwards, the connecting rod 7 drives the paper pressing device 1 to press down, and further the paper on the paper feeding platform 8 is pressed, the structure belongs to the prior art, so that tiring is not carried out any more, the paper pressing device 1 is connected with one end of the return chain 2, the other end of the return chain 2 is connected with an elastic return assembly, the elastic return assembly comprises a pair of return springs 4, one end of the return springs 4 is connected with the screw rod 5, the other end of the return springs is arranged on the spring mounting seat 3, the screw rod 5 is arranged on a frame, and the return chain 2 is connected with the spring mounting seat. The cam 6 is arranged above the paper pressing device 1, the cam 6 is connected with the return chain 4, and when the cam 6 is adopted, the return chain 4 is fixed on the cam at the middle part of the contact position of the return chain 4 and the wheel surface of the cam 6 when the cam 6 is connected with the return chain 4. Of course, in order to have a better effect, the outer periphery of the cam 6 is provided with a sprocket 63 engageable with the return chain, so that the sprocket 63 directly engages with the return chain 4. Because the outer circle size of the cam is larger at the side far away from the return component, and the outer circle size of the cam 6 at the side close to the return component is smaller, the return chain 4 is lifted or lowered along with the cam after the cam rotates, and therefore, under the condition that the stroke of the paper pressing device is unchanged, the return chain can be lifted or lowered along with the cutter, and the stretching and return distance of the return spring is reduced, so that the stretching fatigue of the return spring is greatly reduced, and the service life of the return spring is effectively prolonged. The structure of the invention has smoother and smoother action, effectively simplifies the structure and is convenient for production and assembly and later maintenance and adjustment.