WO2011097833A1

WO2011097833A1 - Improved structure of shears

Info

Publication number: WO2011097833A1
Application number: PCT/CN2010/070783
Authority: WO
Inventors: 韩焕忠
Original assignee: 嘉兴亚特园林机械研究所
Priority date: 2010-02-10
Filing date: 2010-02-26
Publication date: 2011-08-18
Also published as: CN101766097A; CN101766097B

Abstract

An improved structure of shears includes a housing (1), a motor (2) provided in the housing (1) and a trigger (7) provided on the housing (1). A blade assembly (5) at the front is driven by the motor (2) via a transmission. The transmission includes an active transmission assembly (3) connected with the motor (2) and a passive transmission assembly (4) connected with the blade assembly (5). The active transmission assembly (3) is connected with the passive transmission assembly (4) through a helical torsion spring (6), and the torsion spring (6) enclasps the top portion of the active transmission assembly (3) and the end portion of the passive transmission assembly (4) at the same time to achieve linkage rotation of the three assembly of the active transmission assembly (3), the passive transmission assembly (4) and the torsion spring (6). A braking mechanism (8) is additionally provided in the housing (1). When the torsion spring (6) rotates with the active transmission assembly (3), the braking mechanism (8) is locked in the rotational direction of the torsion spring (6) to release the active transmission assembly (3), thereby achieving brake. The braking mechanism (8) which locks or does not lock the torsion spring (6) is controlled by the trigger (7) through a linkage mechanism (9). The shears has the advantages of compact structure, easy changing of blade, steady output power and greatly increased torsion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a garden tool, and more particularly to a scissors machine for trimming branches, shrubs, and the like. BACKGROUND OF THE INVENTION A scissor machine is a commonly used garden tool for trimming branches, shrubs, etc., compared with a conventional manually operated scissors, with a scissors machine for trimming, labor intensity is greatly reduced, efficiency is improved, with greening As the degree increases, the scissors machine will become an indispensable garden tool. However, in practical applications, there are still many shortcomings in the scissors machine. At present, the rotation and braking of most scissors blades need to be realized by the motor reversing, the operation is inconvenient, the energy consumption is large, and more importantly, the output power of the motor. Without effective use, the rotational torque of the blade is reduced, which makes the scissors machine unable to trim the thick branches, which limits the scope of use of the scissors machine. Moreover, the frequent rotation direction of the motor also shortens the motor itself. Service life. SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a scissors machine which is simple in structure, compact, high in transmission efficiency, and high in output power.

In order to achieve the above object, the present invention adopts the following technical solutions: A scissor machine improved structure, including a machine a casing, a motor disposed in the casing, and a trigger disposed on the casing, wherein the motor drives the blade assembly at the front end of the casing through the transmission mechanism, wherein: the transmission mechanism includes an active transmission component and the blade assembly connected to the motor a driven driven transmission assembly, the active transmission assembly and the driven transmission assembly are connected by a torsion spring of a spiral structure, and the torsion spring simultaneously holds the top of the active transmission assembly and the tail of the driven transmission assembly to realize the active transmission assembly, The interlocking rotation of the driven transmission component and the torsion spring also has a braking mechanism in the casing, and the braking mechanism is loosened in the rotation direction of the torsion spring when the torsion spring rotates with the driving transmission component The driving assembly realizes braking, and the trigger controls the braking mechanism to be locked or not locked by the connecting mechanism.

Further, the active transmission assembly includes a bridge shaft for connecting a rotating shaft of the motor, and a shaft sleeve is fixed to the top of the bridge shaft; the driven transmission assembly includes an output shaft, and a crank is disposed at the top of the output shaft. The mechanism is connected to the blade assembly, and the bottom of the output shaft is provided with a cylindrical connecting portion that abuts against the sleeve, and the torsion spring is simultaneously hung on the outer wall of the sleeve and the connecting portion.

Further, the bottom surface of the connecting portion is provided with a positioning protrusion, and the positioning protrusion is inserted into the sleeve hole of the sleeve to realize the active insertion and assembly of the active transmission component and the driven transmission component, thereby ensuring the active transmission component and The driven transmission assembly has good coaxiality when it is rotated in series, which is also beneficial to the improvement of transmission efficiency.

Further, the sleeve hole of the sleeve is provided with an annular step, a screw is screwed to the bottom of the positioning protrusion, and a limit circular table is arranged at the bottom of the screw, and the annular step is inserted in the limit circular table and the protruding column An annular gap is formed between the bottom surfaces, and a plurality of balls are arranged around the annular step and the limiting circular table. The balls form a bearing structure with the annular step and the limiting circular table. The above structure not only prevents the axial gap from becoming large after the connection portion between the sleeve and the output shaft is detached during the violent movement, thereby causing the torsion spring to be deformed, and also reducing the friction between the sleeve and the connecting portion during movement, and improving the transmission efficiency.

Further, the brake mechanism includes a brake block, and a protrusion portion I for locking a torsion spring is disposed on a left side of the top of the brake block, and a protrusion for connecting the connection mechanism at a top right side of the brake block is disposed. Part II, brake block, The convex portion I and the convex portion are integrally formed, and the bottom of the brake block is elastically connected to the casing through a torsion spring II, and the torsion spring II has a downward elastic tensioning force to return the brake block. .

Further, the trigger comprises a turntable transferred to the casing and a rotating handle integrated with the turntable, the connecting mechanism comprises a connecting piece, and the top of the connecting piece is transferred to the turntable of the trigger by a torsion spring III The bottom of the connecting piece is provided with a hook portion I which is fastened to the convex portion of the brake block, and the rotating handle rotates downward to move the rotating plate to move upward, and the hook portion I abuts the convex portion II Pulling the brake block up and away from the clamping position of the torsion spring; the torsion spring III has a downward pulling force to return the connecting piece.

Further, a limiting mechanism is further disposed between the trigger and the connecting mechanism, the limiting mechanism includes a hook portion II disposed at a middle portion of the connecting piece, and a limiting pin is disposed on the casing above the hook portion II, The limit pin catches the hook portion during the rise of the connecting piece, and pushes the connecting piece to rotate outward to disengage the hook portion I from the boss portion II, thereby realizing the reset of the brake block.

Further, the blade assembly includes a blade housing disposed at a front end of the casing, a stationary blade fixed in the blade housing, and a movable blade transferred to the stationary blade, and the tail portion of the movable blade is provided with a hook Connect the crank mechanism.

Further, the blade housing is assembled by the left and right sub-cases by fasteners to facilitate blade replacement.

Further, the crank mechanism includes an eccentric block disposed on the top of the output shaft and driven to rotate by the output shaft, the long axis eccentric head of the eccentric block is transferred with a hook plate, and the other end of the hook plate is provided with a hook The hole is used for hooking the hook of the tail of the moving blade, and the rotation of the eccentric block drives the hook plate to move back and forth to the left and right to drive the moving blade to make a cutting motion around the adapter.

Advantageous Effects of the Invention: The present invention divides the transmission mechanism in the scissors machine into an active transmission assembly and a driven transmission assembly, and the torsion spring connects the active transmission assembly and the driven transmission assembly through the tightness or separation of the torsion spring and the active transmission assembly. Realize the transmission and braking of the scissors machine, the motor always runs in one direction, minus The current consumption is reduced, so that the output power is increased, the shearing torque of the scissors machine is greatly improved, and the thicker branches can be trimmed; and the invention also has the advantages of compact internal structure and convenient blade replacement. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be further described below with reference to the accompanying drawings:

Figure 1 is a schematic view of the internal structure of the present invention;

Figure 2 is an enlarged view of A in Figure 1;

Figure 3 is a schematic view showing the connection structure of the driving transmission assembly, the driven transmission assembly and the blade assembly of the present invention; Figure 4 is an enlarged view of the portion B in Figure 3;

Figure 5 is a schematic view showing the internal structure of the blade assembly of the present invention. 1 to 4, an improved structure of a scissors machine according to the present invention includes a casing 1, a motor 2 disposed in the casing 1, and a trigger 7 disposed on the casing 1, and the motor 2 is driven. The mechanism drives the blade assembly 5 at the front end of the casing 1, the transmission mechanism includes a drive transmission assembly 3 coupled to the motor 2, and a driven transmission assembly 4 coupled to the blade assembly 5, the drive transmission assembly 3 and the driven transmission assembly 4 is connected by a torsion spring 6 of a spiral structure, and the torsion spring 6 simultaneously holds the top of the active transmission assembly 3 and the tail of the driven transmission assembly 4 to realize the active transmission assembly 3, the driven transmission assembly 4, and the torsion spring 6 Rotating in the casing 1 , a braking mechanism 8 is also disposed in the casing 1 , and the braking mechanism 8 is locked in the rotating direction of the torsion spring to release the active transmission component 3 when the torsion spring 6 rotates with the driving transmission component 3 . Braking, the trigger 7 controls the brake mechanism 8 to be locked or not locked by the connecting mechanism 9.

The drive assembly 3 includes a bridge shaft 30 for connecting the rotating shaft of the motor 2, and the top of the bridge shaft is fixed The driven transmission assembly 4 includes an output shaft 40. The top of the output shaft is provided with a crank mechanism for connecting the blade assembly 5, and the bottom of the output shaft 40 is matched with the sleeve 31. The cylindrical connecting portion 41, the torsion spring is simultaneously hung on the outer wall of the sleeve and the connecting portion; the bottom surface of the connecting portion is provided with a positioning protrusion 411, and the positioning protruding rod 411 is movably inserted into the sleeve hole of the sleeve The active plug-in assembly of the active transmission component 3 and the driven transmission component 4 ensures that the active transmission component 3 and the driven transmission component 4 have good coaxiality when rotated in conjunction with each other, and the transmission efficiency is also improved; An annular step 311 is defined in the sleeve hole 31, a screw 43 is screwed to the bottom of the positioning protrusion 411, and a limiting circular table 431 is arranged at the bottom of the screw. The annular step is inserted between the limiting circular table and the bottom surface of the protruding column. In the annular gap, a ring 32 is arranged between the annular step and the limiting circular table, and the ball forms a bearing structure with the annular step and the limiting circular table, so as to prevent the connection between the sleeve and the output shaft from being separated during strenuous movement. Rear The axial clearance becomes larger, which causes the torsion spring to deform, and also reduces the friction between the sleeve and the connecting portion during movement, and improves the transmission efficiency.

The brake mechanism 8 includes a brake block 80. The top left side of the brake block is provided with a boss portion 81 for clamping the torsion spring 6, and the top portion of the brake block is provided with a boss portion for connecting with the connection mechanism 9. 1182, the brake block, the boss portion I and the boss portion are integrated, and the bottom of the brake block is elastically connected to the casing 1 by a torsion spring II 83, and the torsion spring II has a downward elastic pull The tightening force returns the brake block 80; the trigger 7 includes a turntable 71 that is transferred to the casing 1 and a rotating handle 72 that is integral with the turntable. The connecting mechanism 9 includes a connecting piece 90, and the top of the connecting piece 90 The torsion spring ΙΠ93 is transferred to the turntable of the trigger 7, and the bottom of the connecting piece 90 is provided with a hook portion I 91 which is fastened to the convex portion II of the brake block, and the rotating handle 72 is rotated downward to make the turntable pull connection. The piece 90 moves upward, and the hook portion I 91 abuts the boss portion 82 to pull the brake block 80 upward and disengage from the locking position of the torsion spring; the torsion spring ΙΠ 93 has a downward pulling force to make the connecting piece 90 Returning position; a limiting mechanism is further disposed between the trigger 7 and the connecting mechanism 9, and the limiting mechanism comprises a hook portion 1 disposed in the middle of the connecting piece 90 192, a housing pin 1 above the hook portion II is provided with a limiting pin 94, the limiting pin During the ascending process of the connecting piece 90, the hooking portion II pushes the connecting piece 90 outward to rotate the hook portion I and the boss portion II to release the brake block.

As shown in FIG. 5, the blade assembly 5 includes a blade housing disposed at the front end of the casing 1, a stationary blade 51 fixed in the blade housing, and a movable blade 52 coupled to the stationary blade. The tail of the movable blade is provided. A hook 521 is provided for connecting the crank mechanism; the blade housing is assembled by the left and right sub-housings 50, 50' by fasteners 53, facilitating blade replacement. The crank mechanism includes an eccentric block 42 disposed on the top of the output shaft 40 and driven to rotate by the output shaft. The long axis eccentric head 421 of the eccentric block is coupled with a hook plate 44, and the other end of the hook plate is provided with a hook hole 441. The hook 521 is used for hooking the tail of the movable blade 52. The rotation of the eccentric block drives the hook plate to move back and forth to the left and right to drive the movable blade to make a cutting motion around the adapter.

Working principle: In the initial shear state, the positional relationship between the moving blade and the stationary blade is as shown in Fig. 5. The branch to be trimmed can be stuck into the static blade. At this time, the motor has started and the bridge shaft is rotated to make the sleeve and The torsion spring also rotates, but the convex portion I of the brake block is locked in the rotation direction of the torsion spring. Since the sleeve is not engaged, a relative rotation between the sleeve and the torsion spring is generated, and the bottom of the torsion spring is subjected to The force expands and loosens the sleeve, the power of the motor cannot be transmitted to the output shaft, and the blade assembly cannot be cut;

Pulling the rotary handle downward to raise the connecting piece, the hook portion I on the connecting piece is fastened to the convex portion on the brake block during the ascending process, and the braking block is pulled up to be disengaged from the locking position of the torsion spring. The clamping of the torsion spring is cancelled, and the torsion spring holds the sleeve with its own torque, so that the sleeve, the torsion spring and the output shaft rotate in conjunction, and then the moving blade on the blade assembly is driven to perform shearing operation;

As shown in Fig. 1, during the rise of the connecting piece, the hook portion II on the connecting piece is blocked outwardly by the limiting pin provided in the casing, thereby releasing the hook portion I from the boss portion II, and braking The block is pulled back by the torsion spring II, the boss I re-locks the torsion spring to achieve braking, and the moving blade and the stationary blade return to the initial shearing state again, and a shearing cycle ends, at which time the rotating handle is released, and the connecting piece is connected. Resetting under the action of torsion spring III; the motor always rotates in one direction during the entire shear cycle, so the power output is stable compared to The original scissors machine has a greatly improved shear torque and can trim thicker branches. Other than the above-described preferred embodiments, there are other embodiments of the present invention, and those skilled in the art can make various changes and modifications in accordance with the present invention, as long as they do not depart from the spirit of the present invention. range.

Claims

WO 2011/097833 and PCT/CN2010/070783, an improved structure of a scissors machine, comprising a casing (1), a motor (2) disposed in the casing (1), and a casing (1) The trigger (7), the motor (2) drives the blade assembly (5) at the front end of the casing (1) through a transmission mechanism, characterized in that: the transmission mechanism comprises an active transmission assembly (3) connected to the motor (2) And a driven transmission assembly (4) connected to the blade assembly (5), the active transmission assembly (3) and the driven transmission assembly (4) are connected by a torsion spring (6) of a spiral structure, the twist Spring (6) Hold the active drive assembly at the same time (3) The top and the driven drive assembly (4) The tail drive realizes the active drive assembly (3), the driven drive assembly (4), and the torsion spring. (1) A brake mechanism (8) is also provided, and the brake mechanism (8) is locked in the rotation direction of the torsion spring to release the active transmission assembly when the torsion spring rotates with the driving transmission assembly (3) ( 3) Realize the brake, the trigger (7) controls the brake mechanism through the connection mechanism (9) (8) Carded or not twisted springs.

The improved structure of a scissors machine according to claim 1, characterized in that: the driving transmission assembly (3) comprises a bridge shaft (30) for connecting a rotating shaft of the motor (2), the top of the bridge shaft A bushing (31) is fixed; the driven transmission component (4) includes an output shaft (40), and a crank mechanism is disposed at a top of the output shaft to connect the blade assembly (5), and the output shaft (40) The bottom portion is provided with a cylindrical connecting portion (41) which is engaged with the sleeve (31), and the torsion spring (6) is simultaneously hung on the outer wall of the sleeve and the connecting portion.

The improved structure of the scissors machine according to claim 2, wherein the bottom surface of the connecting portion (41) is provided with a positioning protrusion (411), and the positioning protrusion is inserted into the sleeve hole of the sleeve. The active drive assembly (3) is actively mated with the driven drive assembly (4).

The improved structure of the scissors machine according to claim 3, wherein: the sleeve hole of the sleeve is provided with an annular step (311), and the bottom of the positioning protrusion is screwed with a screw (43), a screw The bottom is provided with a limit circular table (431), and the annular step is actively loaded on the bottom surface of the limit circular table and the column WO 2011/097833 and the request PCT/CN2010/070783 form an annular gap, and the ring between the annular step and the limiting circular table is provided with a plurality of balls (32), and the balls form a bearing structure with the annular step and the limiting circular table.

The improved structure of a scissors machine according to claim 1 or 2 or 3 or 4, characterized in that: the brake mechanism (8) comprises a brake block (80), and the top left side of the brake block is provided a boss portion I (81) for a carded torsion spring, a boss portion II (82) for connecting the connection mechanism (9) on the right side of the top of the brake pad, a brake pad, a boss portion I and a boss The part II is a unitary structure, and the bottom of the brake block is elastically connected to the casing (1) by a torsion spring II (83), and the torsion spring II has a downward elastic tensioning force to return the brake block.

The improved structure of a scissors machine according to claim 5, wherein: the trigger (7) comprises a turntable (71) transferred to the casing (1) and a rotating handle (72) integrated with the turntable The connecting mechanism (9) includes a connecting piece (90), and the top of the connecting piece is transferred to the turntable of the trigger (7) through a torsion spring III (93), and the bottom of the connecting piece is provided with a brake block a hook portion I (91) that is fastened to the boss portion II, the rotating handle is rotated downward to move the dial to move the connecting piece upward, and the hook portion I abuts the boss portion II to pull up the brake block The clamping position with the torsion spring; the torsion spring III (93) has a downward pulling force to return the connecting piece (90).

The improved structure of the scissors machine according to claim 6, wherein: the trigger mechanism (7) and the connecting mechanism (9) further comprise a limiting mechanism, wherein the limiting mechanism comprises a middle portion of the connecting piece The hook portion II (91), the casing (1) above the hook portion II is provided with a limit pin (94), and the limit pin catches the hook portion II during the ascending process of the connecting piece to push the connecting piece to rotate outward The hook portion I is disengaged from the boss portion , to realize the reset of the brake block.

The improved structure of a scissors machine according to claim 2 or 3 or 4, wherein: the blade assembly (5) comprises a blade housing disposed at a front end of the casing (1), and is fixed to the blade shell a static blade (51) in the body and a moving blade (52) transferred to the stationary blade, the tail of the moving blade is provided WO 2011/097833 and PCT/CN2010/070783 have a hook (521) for connecting the crank mechanism.

The improved structure of a scissors machine according to claim 8, wherein: the blade housing is assembled by the left and right sub-housings (50, 50') by fasteners (53).

0. The improved structure of a scissors machine according to claim 8, wherein: the crank mechanism comprises an eccentric block (42) disposed on the top of the output shaft and driven to rotate by the output shaft, the long axis of the eccentric block The eccentric head (421) is transferred with a hook plate (44), and the other end of the hook plate is provided with a hook hole (441) for hooking the hook (521) of the tail of the movable blade (51), and the eccentric block (42) Rotate the hook plate (44) to move back and forth to the left and right to drive the moving blade (51) to make a cutting motion around the adapter.