CN202059779U

CN202059779U - Electric pruning scissors

Info

Publication number: CN202059779U
Application number: CN2011200906766U
Authority: CN
Inventors: 聂方杰; 张棋; 石平波
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2011-03-31
Filing date: 2011-03-31
Publication date: 2011-12-07
Anticipated expiration: 2021-03-31

Abstract

The utility model discloses electric pruning scissors, which comprise a shell, a motor which is arranged in the shell, a transmission device which is connected with the motor, one pair of blades and a trigger which is installed on the shell and is used for controlling the motor. The pair of blades comprises a fixed blade and a movable blade, wherein the movable blade swings back and forth under the driving of the motor. The electric pruning scissors are characterized in that the electric pruning scissors additionally comprise a travel switch which is installed on the shell, the travel switch at least comprises two states, when the travel switch is in a first state, the movable blade has a first travel, and when the travel switch is in a second state, the movable blade has a second travel which is different from the first travel. The pruning scissors effectively overcome the defect that time and electricity are wasted when an existing pruning scissors shear twigs.

Description

Electric shrub and hedge trimmer

Technical field

The utility model relates to a kind of electric shrub and hedge trimmer, relates in particular to a kind of electric shrub and hedge trimmer with multiple stroke.

Background technology

Electric shrub and hedge trimmer is widely used because of its profile is small and exquisite, easy to carry as a kind of gardens class instrument.Electric shrub and hedge trimmer comprises a pair of blade that stretches out from casing, one of them blade is fixedly mounted on the casing, and another blade is connected with fixed blade pivotly, and makes reciprocally swinging by motor-driven.When cocking, motor just changes, and drives movable blades and swings towards fixed blade, thereby shear branch, edge of a knife closure; When unclamping trigger, the motor counter-rotating drives movable blades towards the direction swing of leaving fixed blade, and the edge of a knife opens.

The movable blades of existing electric shrub and hedge trimmer only has a stroke, promptly can only swing in an angular range, and it is closed or open up into maximum angle.Its edge of a knife of such shrub and hedge trimmer designs greatlyyer usually, so that can prune a little slightly branch of a bit.Yet, in the operating process of reality, when pruning thinner branch, the stroke of movable blades is that pendulum angle seems excessive for thin branch, the movable blade sector-meeting was swung an angle earlier and was just touched and sheared branch, will have so wherein that LAP comes down to idle stroke, so pruning work seems slow, and wasted time and electric weight.

Summary of the invention

For addressing the above problem, the utility model provides a kind of two-pass electric shrub and hedge trimmer that has, and two kinds of strokes are applicable to fat tree branch and thin branch respectively.When pruning the fat tree branch, select first stroke for use, movable blades can expand into maximum angle; When pruning thin branch, select second stroke for use, movable blades only opens up into intermediate angular position, has avoided the appearance of idle stroke, has saved operator's the time and the electric weight of battery effectively.

Electric shrub and hedge trimmer provided by the utility model comprises: casing, be positioned at the motor of casing, the transmission device that is connected with motor, one blade, and be installed on the trigger that is used to control motor on the casing, a described blade comprises a fixed blade and a movable blades, described movable blades is made reciprocally swinging under the driving of motor, it is characterized in that, described electric shrub and hedge trimmer also comprises a travel switch that is installed on the casing, described travel switch comprises two states at least, when travel switch is in first state, movable blades has first stroke, when travel switch was in second state, movable blades had second stroke that is different from first stroke.

Further, described stroke is the pendulum angle of movable blades, when travel switch is in first state, movable blades has first pendulum angle, when travel switch was in second state, movable blades had second pendulum angle, and first pendulum angle is greater than second pendulum angle.

Further, three position sensors that are used for the sensed activity blade position are housed in the described casing.

Further, described transmission device comprises reduction gear box and Bevel Gear Transmission mechanism, and Bevel Gear Transmission mechanism comprises driving gear and is shaped as fan-shaped driven gear, and driven gear is connected with movable blades.

Further, on the described driven gear magnet is housed

Further, the position of described three position sensor induced magnets.

Further, described trigger is installed on the downside of casing, and described travel switch is installed on the upside of casing, and its position is relative with trigger.

Further, described travel switch is a push button.

Description of drawings

Fig. 1 is the stereogram of the preferred implementation of the shrub and hedge trimmer that disclose of the utility model;

Fig. 2 is the in-built schematic diagram of shrub and hedge trimmer shown in Figure 1;

Fig. 3 is the schematic diagram of pcb board among Fig. 2;

Fig. 4 is the circuit block diagram of shrub and hedge trimmer;

Fig. 5 is the circuit theory diagrams of master control borad;

Fig. 6 is the circuit theory diagrams of blade position signal acquisition module;

Fig. 7 is the circuit theory diagrams of travel switch signal acquisition module.

Embodiment

As depicted in figs. 1 and 2, electric shrub and hedge trimmer 10 comprises casing 1, and this casing 1 is made up of the two halves casing.In Fig. 2, wherein half casing is removed, and it has clearly illustrated the internal structure of shrub and hedge trimmer 10.Battery 2, motor 3 are housed in the casing 1, and transmission device.Transmission device comprises reduction gear box 41 and Bevel Gear Transmission mechanism, and Bevel Gear Transmission mechanism comprises driving gear 42 and driven gear 43, and being shaped as of driven gear 43 is fan-shaped.One blade 5 and 6 is stretched out from casing 1, and wherein, fixed blade 5 is installed on the casing 1 by bolt, and movable blades 6 is connected on the fixed blade 5 pivotly by bolt 7.One end of movable blades 6 is fixedlyed connected with driven gear 43, so it can make reciprocally swinging in the direction of arrow D under the driving of motor 3, realizes the closure of the edge of a knife 60 and opens.

Be used to control the switch trigger 81 of motor 3 and the downside that locking trigger 82 is installed in casing 1, have interlocked relationship between two triggers, promptly have only press locking trigger 82 earlier after, switch trigger 81 just can be pressed.The travel switch 9 that is used to control movable blades 6 strokes is installed in the upside of casing 1, and relative with switch trigger 81 positions, it is embodied in a push button.Regulate between three positions of A, B, C that travel switch 9 can be shown in the figure, when it was in the A position, to motor 3 power supplies, switch trigger 81 was not inoperative for battery 2; When it was in the B position, knife section 6 had big stroke, can swing in a bigger angular extensions alpha, so that can prune thicker branch; When it was in the C position, knife section 6 had little stroke, can only swing in a less angular range beta, was used to prune thinner branch, saw shown in the dotted line among Fig. 2.In the present embodiment, the angle value α of big stroke is 30 °, and can prune diameter is the fat tree branch of Φ 15mm, and the angle value β of little stroke is 12 °, is used to prune the thin branch that diameter is equal to or less than Φ 6mm.

The Stroke Control principle of electric shrub and hedge trimmer 10 is described below.

As shown in Figures 2 and 3, magnet 15 is installed on the driven gear 43, follows driven gear 43 and moves together.The pcb board 14 that three

position sensors

11,12,13 are housed is fixedly mounted in the casing 1, and near driven gear 43, is used for the position of induced magnet 15, also is the position of movable blades 6.What in the present embodiment, position sensor adopted is Hall element.When position sensor 11 is sensed magnet 15, illustrate that movable blades 6 is in the close position; When position sensor 12 is sensed magnet 15, illustrate that movable blades 6 is in the maximum open position, solid line position promptly shown in Figure 2; When position sensor 13 is sensed magnet 15, movable blades 6 aperture position that mediates is described, dotted line position promptly shown in Figure 2.

Shown in Fig. 4-7, the circuit part of electric shrub and hedge trimmer 10 comprises microprocessor MCU and peripheral circuit 20, MOSFET control module 21, DC-DC power module 22, blade position signal acquisition module 23, travel switch signal acquisition module 24, wherein, MOSFET control module 21 is used to control the rotating of motor 3; Blade position signal acquisition module 23 realizes by

position sensor

11,12,13 and magnet 15, when one of them sensor sensing behind magnet 15, send signal and give blade position signal acquisition module 23, thereby obtain movable blades 6 position signallings; Travel switch signal acquisition module 24 is used to gather travel switch 9 residing positions.

When travel switch 9 was positioned at the A position, to microprocessor MCU 20 power supplies, shrub and hedge trimmer 10 were not in off-position to power module 22.When travel switch 9 was positioned at B or C position, battery 2 was given MCU 20 power supplies through power module 22, and shrub and hedge trimmer 10 are in "on" position.At this moment, pull locking trigger 82 and switch trigger 81, MCU 20 sends signal and gives MOSFET control module 21, and drive motors 3 is just changeing, and makes movable blades 6 towards fixed blade 5 swings, the edge of a knife 60 closures; Put in place behind the signal when MCU 20 detects closure on the blade position signal acquisition module 23, control motor 3 stops operating and unclamps up to switch trigger 81; Behind trip switch trigger 81, MCU 20 judges by travel switch signal acquisition module 24 which position travel switch 9 is on earlier, if travel switch 9 is positioned at the B position of big stroke, then MCU 20 makes movable blades 6 open towards rightabout swing, the edge of a knife 60 by 3 counter-rotatings of MOSFET control module 21 drive motors, just stops up to the maximum deployed position signal of blade that detects on the blade position signal acquisition module 23.If travel switch 9 is positioned at the A position of little stroke, then MCU 20 makes movable blades 6 towards the rightabout swing by 3 counter-rotatings of MOSFET control module 21 drive motors, just stops up to the blade centre position signal that detects on the blade position signal acquisition module 23.

In the present embodiment, electric shrub and hedge trimmer 10 is under Light Condition, and the time that movable blades 6 opens up into the maximum open position to be needed is 0.8S, and the time that opening up into the middle opening position needs is 0.5S.So, when shearing thin branch, if the user is set in travel switch the C position of little stroke, shear action will be saved (comprising edge of a knife opening and closing) time of 0.6S so, improved operating efficiency effectively, solved that existing shrub and hedge trimmer are lost time and the problem of electric weight when shearing thin branch.

The above is a preferred implementation of the present utility model, wherein disclosed and have two-pass electric shrub and hedge trimmer, promptly movable blades has big stroke and little stroke, and it can open up into the maximum open position, also can expand into the middle opening position, be respectively applied for and prune fat tree branch and thin branch.In other embodiments, based on inventive concept of the present utility model, electric shrub and hedge trimmer also can be designed to have three kinds or more kinds of stroke, makes the purposes refinement more of shrub and hedge trimmer.In addition, the location sensitive mode of movable blades also is not limited to above-mentioned Hall element and magnet, utilizes other modes such as optoelectronic switch or travel switch also can realize.Moreover travel switch also can adopt the snapper of electronic type, and it comprises two states, corresponds respectively to big stroke and little stroke, and the travel switch signal acquisition module is used to gather the residing status information of travel switch.

Claims

1. an electric shrub and hedge trimmer comprises: casing, be positioned at the motor of casing, the transmission device that is connected with motor, one blade, and be installed on the trigger that is used to control motor on the casing, a described blade comprises a fixed blade and a movable blades, described movable blades is made reciprocally swinging under the driving of motor, it is characterized in that, described electric shrub and hedge trimmer also comprises a travel switch that is installed on the casing, described travel switch comprises two states at least, when travel switch is in first state, movable blades has first stroke, when travel switch was in second state, movable blades had second stroke that is different from first stroke.

2. electric shrub and hedge trimmer as claimed in claim 1, it is characterized in that, described stroke is the pendulum angle of movable blades, when travel switch is in first state, movable blades has first pendulum angle, when travel switch was in second state, movable blades had second pendulum angle, and first pendulum angle is greater than second pendulum angle.

3. electric shrub and hedge trimmer as claimed in claim 1 is characterized in that, three position sensors that are used for the sensed activity blade position are housed in the described casing.

4. electric shrub and hedge trimmer as claimed in claim 3 is characterized in that, described transmission device comprises reduction gear box and Bevel Gear Transmission mechanism, and Bevel Gear Transmission mechanism comprises driving gear and is shaped as fan-shaped driven gear, and driven gear is connected with movable blades.

5. electric shrub and hedge trimmer as claimed in claim 4 is characterized in that, a magnet is housed on the described driven gear.

6. electric shrub and hedge trimmer as claimed in claim 5 is characterized in that, the position of described three position sensor induced magnets.

7. electric shrub and hedge trimmer as claimed in claim 1 is characterized in that described trigger is installed on the downside of casing, and described travel switch is installed on the upside of casing, and its position is relative with trigger.

8. electric shrub and hedge trimmer as claimed in claim 7 is characterized in that, described travel switch is a push button.