EP1466666A2 - Garten-Zerkleinerungsmaschine - Google Patents
Garten-Zerkleinerungsmaschine Download PDFInfo
- Publication number
- EP1466666A2 EP1466666A2 EP04252071A EP04252071A EP1466666A2 EP 1466666 A2 EP1466666 A2 EP 1466666A2 EP 04252071 A EP04252071 A EP 04252071A EP 04252071 A EP04252071 A EP 04252071A EP 1466666 A2 EP1466666 A2 EP 1466666A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- motor
- shredder
- garden
- speed
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
- B02C18/12—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers with drive arranged below container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C18/24—Drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/04—Safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C2018/164—Prevention of jamming and/or overload
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C2018/168—User safety devices or measures in shredders
Definitions
- the present invention relates to a garden shredder for shredding leaves, branches and the like driven by an electric motor.
- Plant shredders are commonly used in gardens to shred garden material such as leaves, small branches and other material fed (usually manually) to the shredder via a feeder and discharging the shredded material (usually via a chute). They are typically driven by an electric motor, which in turn drives blades at a relatively high speed, (typically 3,000 rpm) which engage with the material to be shredded and shreds it as desired.
- a relatively high speed typically 3,000 rpm
- Such shredders are generally quite noisy and it is highly desirable to reduce the noise level of the shredder.
- the noise level of the shredder can increase when the load on the motor in the shredder reduces. For example when the shredder has completed the shredding of a branch, the motor will tend to speed up which increases the noise. This can be particularly troublesome as for most of the time the shredder is not under load.
- the same power can be provided for less weight than an induction motor because the series motor can be run at high speed and thus less material such as copper can be used in its construction.
- the disadvantage of the series motors is that when the load is removed from the motor, the motor will speed up to a substantial extent causing it to be noisy.
- the environment of a shredder is relatively rough and it is desirable to protect the components, particularly the electrical components as far as possible to provide a long life.
- the present invention provides a garden shredder to shred garden material comprising a feeder for receiving said garden material, one or more blades for shredding said garden material received by said feeder, a series-type electric motor connected to move said one or more blades, and an electronic controller for controlling the electric motor, the electronic controller comprising an electronic circuit including means to sense the speed of rotation of the motor and means to control the speed of the motor to reduce the increase of the speed of rotation of the motor when the load applied to the motor by said one or more blades is reduced or removed.
- the control means preferably includes means to control the power to the electric motor.
- the power control means preferably comprises a triac or thyristor.
- the control means preferably includes means to provide an electrical parameter which represents the target speed of rotation of the motor.
- the electrical parameter may be an electrical signal, which may be digital or analog, or may be an electrical value such as current or voltage.
- There may also be provided means for measuring the speed of the motor which provides an output which represents the speed of the motor.
- the output may be in the form of a digital or analog signal, or an optical or electrical value such as brightness or voltage or current. Means may be provided to turn this measured component into a parameter which may be compared with the parameter provided by the control means to control the speed of the motor.
- the control means may also include means to detect an overload of the motor, said overload detecting means being connected to the control means to reduce the power to the electric motor.
- a start acceleration means may be provided to control the initial acceleration of the electric motor and thereby reduce the initials stress on the motor.
- the control means may also include a stop/start control means having three positions, an off position in which any power applied to the stop/start control means is not passed to the motor of the shredder, a running position in which power is passed to the shredder if various parameters are met, and a start position in which the shredder may be started.
- the stop/start control means may include mechanical means requiring the stop/start control means to pass through the off position before returning to the start position if power to the shredder is interrupted.
- the stop/start means includes electronic circuit means for providing DC power to some or all of the other electronic components in the electronic controller, said electronic circuit means being adapted so that, if power to the shredder is interrupted, said electronic circuit means interrupts the DC power to the other circuits and remains in that state until both power to the shredder is restored and a manually operated switch is operated.
- the electronic controller may be provided in a housing surrounding a shaft of the motor, the housing including an aperture therethrough through which the shaft passes, whereby to facilitate measurement of the speed of rotation of the shaft.
- FIG. 1 and 2 there is shown in diagrammatic form a shredder for use in shredding garden material such as leaves or small branches in a garden.
- the shredder comprises a base unit 10 and legs 11 to space the base unit 10 from the ground.
- Mains AC electricity is provided by means of a cable (not shown) connected to a socket 13.
- a series type universal electric motor 12 drives either directly from the motor shaft or indirectly via a belt or gear arrangement a set of rotating blades 14 in a vertically orientated feeder 16, the feeder 16 having an open upper end 17 incorporating a safety guard 15 for receiving the garden material to be shredded.
- a housing 18 surrounding the blades 14 incorporates an exit chute 19 to discharge shredded material.
- leaves or small branches or twigs are manually fed into the open upper end 17 of the feeder 16 whilst the electric motor 12 is rotating the blades 14, and the leaves and branches are shredded and the shredded remains are discharged through the chute 19.
- FIG. 2 shows a vertical section through a preferred shredder of the invention. It will be noted that there is provided an electronic controller 20 which forms a generally flat rectangular plate like member 52 including a central aperture 53 through which or into which the shaft 54 of the electric motor 12 passes.
- FIG 3 is a perspective view of some of the internal components of the shredder of Figure 1. The same reference numerals have been used as in Figures 1 and 2.
- Figure 3 is upside down with respect to the relevant components shown in Figures 1 and 2.
- Figure 3 shows a belt drive housing 56 and illustrates clearly the shape of the plate 52 on which the electronic controller 20 is mounted.
- Figure 3 also illustrates the protruding shaft 57 which protrudes from a conical housing 58, the protruding shaft 57 mounting, in use the blades 14.
- the electronic controller 20 is illustrated in diagrammatic form.
- the electronic controller 20 is provided to control the speed of the series electric motor and in particular to reduce the increase in speed of the motor when a load is reduced.
- the power supply 20 which may be mains AC power, is applied to a stop/start control 22 which in turn passes power to a power control 23.
- the stop/start control 22 is also connected to a power supply failure control 24 which in turn is connected to a control logic 26.
- the control logic 26 is connected to receive inputs from a start acceleration setting means 27, a speed setting means 28 and an overload protection setting means 29.
- the power control 23 is connected to pass power to the motor 12, the motor 12 including a speed sensor 32 and a load sensor 33.
- the speed sensor 32 comprises one or more magnets 35 mounted on the shaft 54 where it passes through the plate 52. This is particularly convenient as the part of the speed sensor 32 which detects the magnets may be mounted within the electronic controller 20 but adjacent to the rotating magnets 35 or other rotatable mounting driven by the motor 12, the magnets 35 rotating past an inductor L1 (illustrated in Figure 5).
- the speed sensor 32 and load sensor 33 are connected to the control logic 26.
- the arrangement of Figure 4 is operated as follows.
- the power supply 21 is connected to the stop/start control 22.
- the stop/start control includes a mechanical three-position manually operated switch, the three switch positions being “OFF”, “RUNNING” and spring-loaded “START".
- the switch When the switch is in the "START” position, it is spring loaded back to the " RUNNING" position.
- the switch is necessary to move the switch from the "OFF” position, through the "RUNNING" position to the third spring-loaded "START” position. Thereafter the switch may be left to return to the "RUNNING" position. In this "RUNNING" position, as long as other criteria are met, power is provided to the power control 23 and then to the motor 12 to operate the motor.
- the shredder will not restart without the stop/start control switch being once more switched to the "START" position to re-establish the run mode in the electronic circuitry.
- stop/start switch is such that restarting cannot be achieved without first returning the switch to the "OFF” position and then passing through the "RUNNING" position to the "START" position,
- the speed of rotation of the motor 12 is measured by the speed sensor 32 and a relevant electrical value passed to the control logic 26.
- the control logic 26 compares the electrical value derived from the speed measured by the speed sensor 32 with a signal or electrical value representing a pre-set speed from the speed setting means 28 and controls the power control 23 to maintain the speed of the motor 12.
- the control logic 26 will control the power control 23 to maintain that speed at or about a predetermined value.
- the start acceleration setting means 27 provides a signal or electrical value to the control logic 26 so that as the motor 12 is started, the acceleration of the motor 12 is controlled to a predetermined extent. This provides a smooth start which improves the life of the components of the motor and also enhances the quality perception of the shredder.
- the load sensor 33 senses that and passes an electrical value or a signal to the control logic 26, and as that measured value of load reaches the preset value set in the overload protection setting means 29, the control logic 26 controls the power controller 23 to reduce or cut the power to the motor 12.
- a time delay may be provided in the control logic 26 to allow higher overload levels for limited short periods.
- Figure 5 shows a detailed circuit diagram of the components set out in Figure 4. Not all of the components of Figure 5 will be specifically referred to, as the components are clearly set out in the circuit diagram in standard notation.
- the power supply 21 is provided by mains power provided to the terminals J5 and J6, and the power control 23 is provided by a triac Q1.
- the power from the mains terminals J5, J6 is provided via the triac Q1 to motor terminals J1, J2 which are applied to the motor 12.
- the triac Q1 is controlled by a signal on line 25 from the control logic 26 (Q3) via a resistor R12.
- Triac Q1 varies the speed of the motor by varying the power provided thereto by "chopping" the AC voltage waveform applied in accordance with the control signal on line 25.
- capacitor C13, resistor R1 and diode D1 provide a DC supply on line 34 for the control logic 26.
- the supply failure control 24 of Figure 4 comprises resistors R17, R11, R19, diode D2, transistors Q4, Q2 and the terminals J3 and J4. If the power is interrupted and then restored, Q4 will be first to turn on, holding Q2 off. D2 will then hold the DC supply below the operating threshold of the control logic Q3, keeping the motor off.
- control logic 26 of Figure 4 is provided by the integrated circuit Q3 of Figure 5.
- the speed sensor 32 of Figure 4 is provided inter alia by the inductor L1, resistor R5, capacitor C4, and frequency-to-voltage converter 38 inside the controller Q3.
- L1 is an inductor which picks up the varying magnetic field as magnets driven by the motor rotate past it and with resistor R5 and capacitor C4 provides on terminal 8 a voltage whose frequency is proportional to the rotation of the motor.
- the frequency-to-voltage converter 38 converts that into a voltage which is applied to one input of a comparator 39.
- the other input of the comparator 39 is from terminal 11 which receives a voltage from the speed setting means 28, comprising resistors R13, R14, R15 and capacitor C10.
- the comparator 39 thereby provides a signal to a phase the controller 41 which controls the speed of the motor in accordance with the signal received from the comparator 39.
- the phase controller 41 passes pulses on line 25 to the triac Q1, the phase of the pulses controlling the triac Q 1 to control the speed of the motor.
- the speed control sensor will not be operational. This is detected by passing pulses from the frequency-to-voltage converter 38 to a tacho monitor 43 which, if no pulses are detected, cuts off the triac Q1 pulses after a delay determined by C12 and R16.
- the output of the comparator 39 is also connected to an overload means 42 which, if an overload is detected, as will be described hereafter, reduces the output of comparator 39 causing the phase controller 41 to reduce the phase angle of the trigger pulses passed on line 25 to the triac Q1 and hence the spread of rotation of the motor.
- the load current detected by R8, via R10 is integrated by C9. Should the voltage across C9 exceed an internally set threshold load limiting is turned on. This reduces the output of the comparator 39 reducing the phase angle of the trigger pulses generated by the phase controller 41.
- the start acceleration setting means 27 of Figure 4 comprises a soft start means 46 and transistor Q10 and capacitor C3 of Figure 5.
- the value of the capacitor C3 sets the operation of the soft start means 46 by applying a signal to the gate of Q10 which controls the output signal from comparator 39 so that during the initial stages of operation the output signal of comparator 39 is ramped which causes the phase angle of the trigger pulses fed to line 25 by phase controller 41 to increase in a smooth manner to control the initial acceleration of the motor 12 to build up speed smoothly.
- the electronic controller also provides "soft start” effects so that the shredder builds up speed smoothly when turned on. This enhances the quality of the shredder as well as reducing stresses in the drive and increasing product life.
- the electronic control also incorporates a "zero voltage switch off' which means that if there is a loss of power supply, the shredder will not start up again when the power returns. This is usually provided by a relay type switch which can be unreliable.
- the speed sensor 32 as incorporating magnets and an inductor to pick up the rotation of the magnet
- other arrangements may be used such as an optical sensor.
- a typical arrangement might comprise a slotted disc mounted to the motor shaft whereby light passes through the slots as the slots pass between a light source and a light detector. In that way a digital signal relating to the speed of rotation of the motor may be readily provided.
- the speed may be sensed not by direct means, but by a signal analysis system which analyses the electrical signal at some point in the electronic controller, to detect any regular changes in the signal, voltage or current value which reflects the speed of rotation of the motor. For example, if the motor includes a commutator, then the commutator tends to provide "spikes" of electrical voltage or current which may be readily detected.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Pulverization Processes (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0308012A GB0308012D0 (en) | 2003-04-07 | 2003-04-07 | Garden shredder |
GB0308012 | 2003-04-07 |
Publications (4)
Publication Number | Publication Date |
---|---|
EP1466666A2 true EP1466666A2 (de) | 2004-10-13 |
EP1466666A3 EP1466666A3 (de) | 2005-05-18 |
EP1466666B1 EP1466666B1 (de) | 2008-10-08 |
EP1466666B9 EP1466666B9 (de) | 2009-05-06 |
Family
ID=9956346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040252071 Expired - Fee Related EP1466666B9 (de) | 2003-04-07 | 2004-04-07 | Garten-Zerkleinerungsmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1466666B9 (de) |
DE (1) | DE602004016905D1 (de) |
GB (1) | GB0308012D0 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2014369A1 (de) * | 2007-07-12 | 2009-01-14 | Viking GmbH | Häcksler |
EP2072137B1 (de) | 2007-12-21 | 2019-05-15 | Robert Bosch Gmbh | Pflanzenhäcksler |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4936517A (en) * | 1987-10-20 | 1990-06-26 | Ideal-Werk Krug & Priester Gmbh & Co. Kg | Document shredder |
DE4231376A1 (de) * | 1992-09-21 | 1994-03-24 | Jirka Dipl Ing Blaha | Schredder zum Zerkleinern von Gegenständen |
EP0594907A1 (de) * | 1992-10-28 | 1994-05-04 | Tai-Her Yang | Schaltungsanordnung zur Begrenzung der Geschwindigkeit eines Reihenschluss- oder Kompound-Elektromotors universeller Art |
DE19617673A1 (de) * | 1996-05-03 | 1997-11-06 | Viking Umwelttechnik | Zerkleinerungsvorrichtung für Gartenabfälle |
-
2003
- 2003-04-07 GB GB0308012A patent/GB0308012D0/en not_active Ceased
-
2004
- 2004-04-07 EP EP20040252071 patent/EP1466666B9/de not_active Expired - Fee Related
- 2004-04-07 DE DE200460016905 patent/DE602004016905D1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4936517A (en) * | 1987-10-20 | 1990-06-26 | Ideal-Werk Krug & Priester Gmbh & Co. Kg | Document shredder |
DE4231376A1 (de) * | 1992-09-21 | 1994-03-24 | Jirka Dipl Ing Blaha | Schredder zum Zerkleinern von Gegenständen |
EP0594907A1 (de) * | 1992-10-28 | 1994-05-04 | Tai-Her Yang | Schaltungsanordnung zur Begrenzung der Geschwindigkeit eines Reihenschluss- oder Kompound-Elektromotors universeller Art |
DE19617673A1 (de) * | 1996-05-03 | 1997-11-06 | Viking Umwelttechnik | Zerkleinerungsvorrichtung für Gartenabfälle |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2014369A1 (de) * | 2007-07-12 | 2009-01-14 | Viking GmbH | Häcksler |
EP2072137B1 (de) | 2007-12-21 | 2019-05-15 | Robert Bosch Gmbh | Pflanzenhäcksler |
Also Published As
Publication number | Publication date |
---|---|
DE602004016905D1 (de) | 2008-11-20 |
EP1466666A3 (de) | 2005-05-18 |
EP1466666B1 (de) | 2008-10-08 |
EP1466666B9 (de) | 2009-05-06 |
GB0308012D0 (en) | 2003-05-14 |
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