Patent Publication Number: US-10759078-B2

Title: EG-1680 three hole electric puncher

Description:
FIELD OF INVENTION 
     The present invention belongs to the technical field of puncher, specifically involving electric puncher. 
     BACKGROUND OF INVENTION 
     Commonly used office punchers are normally divided into manual and electric punchers by the driving form, and could be classified by punching capacity per cycle into single-hole puncher, two-hole puncher, three-hole puncher, and multi-hole puncher; the punching capacity varies from 1 to 60 pieces of paper. Common office punchers available on market are generally operated manually, thus being time consuming, laborious and difficult to use. Hence, electric punchers is developing; however, punchers available on market with punching capacity of more than 20 sheets or multi-hole punchers consume much power and require high-strength gears, which leads to relatively high prices and low cost performance, and may frequently impair the service life of punchers, failing to address consumers&#39; operational requirements. 
     CONTENT OF INVENTION 
     The present invention is intended to present an easy-to-use compact electric puncher with high cost performance and stable functionality so as to solve the problems raised in the background art above. 
     To achieve the goal described above, the present invention proposes the following technical scheme: 
     An electric puncher, including a base, at least two punching devices, a rotating shaft and a drive unit; the punching device includes the support frame arranged on the base and the punching assembly that moves up and down along the support frame; the rotating shaft can be connected with the support frame through rotation; the rotating shaft is furnished with eccentric cams that drive the punching assembly to move up and down; Each of the eccentric cams are arranged with certain angle relative to other cams such that the punching assemblies move up and down asynchronously during the rotation of rotating shaft; the drive unit is configured to drive the rotating shaft. 
     Preferably, the rotating shaft is correspondingly furnished with three eccentric cams arranged with 90° angle between each other. 
     Preferably, the punching assembly includes a slide frame moving up and down along the said support frame; the slide frame includes an integrally connected top board and base board; under the base board is a punch; the eccentric cams are arranged between the top board and base board of slide frame; when the flange of eccentric cam is propped against the base board, it drives the slide frame to move down along support frame, guiding the downward movement of punch to finish punching operation; when the flange of eccentric cam is propped against the top board, it drives the slide frame to move up along support frame, guiding the punch to move up and return to its home position. 
     Preferably, the base board of said slide frame is provided with a cushion block to increase the bearing capacity of slide frame. 
     Preferably, the drive unit includes a motor and a gear box; inside the gear box are carrier gear and drive gear connected through meshing transmission; the carrier gear is connected with motor transmission; the driven gear is fixed to the rotating shaft. 
     Preferably, the support frame includes a left support and a right support working with each other; the left support is provided with a through hole, through which the rotating shaft passes; the right support is connected to rotating shaft respectively through rotor through rotation. 
     Preferably, the right support is furnished with a slideway for punching assembly to move up and down; in the combined state, the eccentric cams and punching assemblies are located in the space formed by the left and right supports. 
     Preferably, the lower portion of the right support is provided with a punching inlet for placing papers to be punched, and the base is correspondingly provided with a groove for mounting the right support; the bottom of the said punching inlet is flush with the bench surface of base; the right support is provided with a through hole for the vertical movement of punch. 
     Preferably, the rotating shaft is fixedly furnished with a touch bar; the said base is provided with the first micro switch that works with touch bar. 
     Preferably, an upper cover is included; the upper cover is designed with a punch key with spring; the base is provided with the second micro switch that works with punch key. 
     Preferably, the rotating shaft is a solid square iron shaft. 
     Preferably, there is also a bottom cover designed with scale. 
     Preferably, inside the bottom cover is a battery case. 
     Preferably, a PCB assembly is further included and electrically coupled to the drive unit. 
     Preferably, a DC socket is included. 
     Preferably, the electric puncher is powered by battery or AC power source. 
     Advantages and benefits of the present invention: 
     1. Compared with the prior art, the EG-1680 Three hole electric puncher drives the gear assembly and the rotating shaft to rotate through a motor so that the eccentric cam rotates in the slide frame, thereby causing the punch to move up and down along the slideway of right support for cutting paper; This product is compact in structure, easy to use, cost-effective, and stable in function. 
     2. In the electric puncher of the present invention there are a number of eccentric cams arranged with angular misalignments that enable the asynchronous vertical motion of punching assembly through the rotation of rotating shaft; each time the eccentric cam rotates one revolution, the punching assembly finishes a cycle of vertical reciprocating motion. The asynchronization saves labor, thereby alleviating the requirements for motor output power and gear strength. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is the exploded perspective view of electric puncher. 
         FIG. 2  is the schematic structural view of punching assembly. 
         FIG. 3  is the schematic view indicating the assembly of punching device, eccentric cam and rotating shaft. 
         FIG. 4  is the schematic view indicating the assembly of punching assembly and right support. 
         FIG. 5  is the schematic illustration of punching assembly with the eccentric cam rotated by 180°. 
         FIG. 6  is the schematic illustration of punching assembly with the eccentric cam rotated by 360°. 
         FIG. 7  is the schematic illustration of touch bar and the first micro switch. 
         FIG. 8  is the schematic structural view of drive unit. 
         FIG. 9  is the schematic circuit diagram of the electric puncher of the present invention. 
     
    
    
     SPECIFIC EMBODIMENTS 
     To facilitate the understanding by the skilled in the art, the present invention will be further described in combination with attached drawings and embodiments. 
     Embodiment 1 
     Referring to  FIGS. 1, 3 and 7 , the electric puncher includes a base  1 , a punching device  25 , a rotating shaft  2  and a drive unit  26 ; the punching device  25  includes the support frame  251  arranged on the base  1  and the punching assembly  252  that moves up and down along the support frame  251 , of which the number being two in this embodiment; the rotating shaft  2  is a solid square iron shaft that can be connected with the support frame  251  during a rotation of the rotating shaft  2 ; the rotating shaft  2  is correspondingly furnished with appropriate eccentric cams  4  that drive the punching assembly  251  to move up and down; the eccentric cams  4  are arranged with an angle of 90° between one another so that the punching assemblies  251  move up and down asynchronously during the rotation of rotating shaft  2 ; rotating shaft  2  is also fixedly designed with a touch bar  15 ; the base  1  is furnished with the first micro switch  16  cooperating with touch bar  15 ; the drive unit is configured to drive the rotating shaft  2 . 
     Compared with prior art, the electric puncher EG-1680 of the present invention is designed with a number of eccentric cams  4  arranged with angular misalignments that enable the asynchronous vertical motion of punching assembly through the rotation of rotating shaft  2 ; each time the eccentric cam  4  rotates one revolution, the punching assembly finishes a cycle of vertical reciprocating motion. The asynchronization saves labor, thereby alleviating the requirements for motor output power and gear strength. This product is compact, easy to sue, cost effective, and stable in function. 
     As shown in  FIGS. 2, 5 and 6 , the said punching assembly includes a slide frame  5  moving up and down along the said support frame; the said slide frame  5  includes the integrally connected top board  51  and base board  52 ; under the said base board  52  is a punch  6 ; the said eccentric cams  4  are arranged between the top board  51  and base board  52  of slide frame  5 ; when the flange of eccentric cam  4  is propped against the base board  52 , it drives the slide frame  5  to move down along support frame, guiding the downward movement of punch  6  to finish punching operation; when the flange of eccentric cam  4  is propped against the top board  51 , it drives the slide frame  5  to move up along support frame, guiding the punch  6  to move up and return to its home position. The base board  52  of slide frame  5  is designed with a cushion block  7  to increase the bearing capacity of slide frame  5 . 
     As shown in  FIG. 8 , the said drive unit includes a motor  8  and a gear box  9 ; inside the said gear box are carrier gear  10  and drive gear  11  connected through meshing transmission; the said carrier gear  10  is connected with motor  8  transmission; the said driven gear  9  is fixed to the rotating shaft  2 . 
     Specifically, the said support frame includes a left support  12  and a right support  13  working with each other; the said left support  12  is provided with a through hole, through which the rotating shaft passes; the said right support  13  is connected to rotating shaft  2  respectively through rotor  14  through rotation. 
     Specifically as shown in  FIG. 4 , the said right support  13  is furnished with a slideway  131  for punching assembly to move up and down; in the combined state, the said eccentric cams  4  and punching assemblies are located in the space formed by the left  12  and right supports  13  to assure compact structure and the stable function during operation. 
     Specifically as shown in  FIG. 4 , the lower portion of the right support  13  is provided with a punching inlet  132  for placing paper, and the base  1  is correspondingly designed with a groove  14  for mounting the right support; in the combined state, the bottom of the said punching inlet  132  is flush with the bench surface of base  1 ; the said right support  13  is designed with a through hole for the vertical movement of punch. 
     This electric puncher further includes upper cover  3  and bottom cover  18 ; upper cover  3  is designed with a spring-loaded punch key  19 ; base  1  is furnished with the second micro switch  17  that works with punch key  19 ; the said bottom cover  18  is provided with scale  20  that works with punching inlet  132  to limit the location of paper; inside the bottom cover is a battery case for accommodating the batteries. 
     The electric puncher further includes PCB (Printed Circuit Board hereinafter referred to as PCB) assembly  22 ; the said PCB assembly  22  is electrically connected with drive unit, and the schematic circuit diagram in PCB assembly is shown in  FIG. 9 ; to avoid motor underpower resulting from excessively low voltage of (old) battery, which may cause the punch to fail to penetrate (a number of pieces of) paper, the PCB is specially designed with a reverse feature; operating principle of the PCB assembly: The motor runs forward when S 1  is closed. When the motor runs forward to a certain position, S 2  is closed, which causes the motor to stop; if S 2  is not closed within 4 seconds after the forward operation of motor after the closing of S 1 , the motor will run reversely until S 2  is closed and the motor stops. If S is still not closed within 4 seconds after the reverse operation of motor, the motor will stop. 
     The electric puncher further includes DC socket  21 ; the electric puncher of the present invention can be powered by battery or AC power source. 
     Operating principle of the electric puncher of the present invention: Put the paper at punching inlet  132 ; turn on the power supply; press punch key  19  and touch the second micro switch  17 , when the motor  8  is started to drive the gear set, rotating shaft  2  and eccentric cam  4  to rotate; eccentric cam  4  pushes cushion block  7  to move down together with punching assembly along the slideway  131  of right support for paper cutting; as shown in  FIG. 5 , when the rotation angle of eccentric cam  4  reaches 180°, which is to say, the flange of eccentric cam is propped against base board  52 , the punching assembly moves down to finish the punching operation; as shown in  FIG. 6 , when the rotation angle of eccentric cam reaches 360°, which is to say, the flange of eccentric cam is propped against top board  51 , touch bar  15  touches the first micro switch  16 , when motor  8  is powered off; the punching assembly moves up to its home position, and a paper-cutting cycle is finished here. 
     The embodiment above only deals with the preferred mode of execution of the present invention; although its description is specific and detailed, this shall in no case restrict the scope of right to the present invention. Hence, the scope of patent protection for the present invention shall be subject to the attached claims.