EG-1680 three hole electric puncher

Abstract

Disclosed is an electric puncher. The electric puncher includes at least one punching device, a rotating shaft and a drive unit. The punching device further includes a support frame arranged on the base and a 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. The staggered arrangement of eccentric cams enables the punching assemblies to asynchronously move up and down during the rotation of rotating shaft. The drive unit drives the rotating shaft to rotate. The asynchronous vertical motion of various punching assemblies helps to save labor, thereby alleviating the requirements for motor output power and gear strength.

Claims

1. An electric puncher, including a base, at least two punching devices, a rotating shaft and a drive unit; each of the punching device further comprises a support frame arranged on the base, and a punching assembly that moves up and down along the support frame; the rotating shaft is connected with the support frame during rotation; the drive unit is configured to drive the rotating shaft to rotate; wherein each of the punching assembly is further provided with a corresponding eccentric cam on the rotating shaft for driving the punching assembly to move up and down; and each of the eccentric cam is arranged with angles relative to other cams such that the punching assemblies move up and down asynchronously during the rotation of rotating shaft.

2. The electric puncher of claim 1, wherein the number of the support frame and punching assembly being three; and the number of the eccentric cam being three and the angles between each of the eccentric cam being 90.

3. The electric puncher of claim 1, wherein the punching assembly further includes a slide frame moving up and down along the support frame; the slide frame includes an integrally connected top board and base board; a punch is provided under the base board; each of the eccentric cam is arranged between the top board and the base board of slide frame; when a flange of the eccentric cam is propped against the base board, the eccentric cam drives the slide frame to move down along support frame, guiding a downward movement of the punch to finish a punching operation; when the flange of eccentric cam is propped against the top board, the eccentric cam drives the slide frame to move up along the support frame, guiding the punch to move up and return to an initial position.

4. The electric puncher of claim 3, wherein the base board is provided with a cushion block.

5. The electric puncher of claim 1, wherein the drive unit includes a motor and a gear box; the gear box is further provided with carrier gear and drive gear connected through meshing transmission therein; the carrier gear is connected with a motor transmission; and the driven gear is fixed to the rotating shaft.

6. The electric puncher of claim 1, wherein 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; and the right support is connected to the rotating shaft during a rotation of the rotating shaft.

7. The electric puncher of claim 6, wherein the right support is provided with a slideway for the punching assembly to move up and down; and the eccentric cam and the punching assembly are located in the space formed by the left support and the right support.

8. The electric puncher of claim 6, wherein a 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 punching inlet is flush with a bench surface of base; the right support is provided with a through hole for a vertical movement of punch.

9. The electric puncher of claim 1, wherein a touch bar is fixedly provided on the rotating shaft and a first micro switch cooperating with the touch bad is provided on the base.

10. The electric puncher of claim 1, wherein an upper cover is arranged around the punching device, the rotating shaft and the drive unit; and a punch key with a spring is provided on the upper cover and a second micro switch cooperating with the punch key is provided on the base.

11. The electric puncher of claim 1, wherein the rotating shaft is a solid square iron shaft.

12. The electric puncher of claim 1, wherein a bottom cover is further provided at the bottom of the base; and the bottom cover is provided with a scale.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is the exploded perspective view of electric puncher.

(2) FIG. 2 is the schematic structural view of punching assembly.

(3) FIG. 3 is the schematic view indicating the assembly of punching device, eccentric cam and rotating shaft.

(4) FIG. 4 is the schematic view indicating the assembly of punching assembly and right support.

(5) FIG. 5 is the schematic illustration of punching assembly with the eccentric cam rotated by 180.

(6) FIG. 6 is the schematic illustration of punching assembly with the eccentric cam rotated by 360.

(7) FIG. 7 is the schematic illustration of touch bar and the first micro switch.

(8) FIG. 8 is the schematic structural view of drive unit.

(9) FIG. 9 is the schematic circuit diagram of the electric puncher of the present invention.

SPECIFIC EMBODIMENTS

(10) 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

(11) 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.

(12) 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.

(13) 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.

(14) 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.

(15) 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.

(16) 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.

(17) 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.

(18) 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.

(19) 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 S1 is closed. When the motor runs forward to a certain position, S2 is closed, which causes the motor to stop; if S2 is not closed within 4 seconds after the forward operation of motor after the closing of S1, the motor will run reversely until S2 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.

(20) The electric puncher further includes DC socket 21; the electric puncher of the present invention can be powered by battery or AC power source.

(21) 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.

(22) 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.