WO2013144457A1 - Brake mechanism for an electronic pipette - Google Patents

Brake mechanism for an electronic pipette Download PDF

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Publication number
WO2013144457A1
WO2013144457A1 PCT/FI2013/050359 FI2013050359W WO2013144457A1 WO 2013144457 A1 WO2013144457 A1 WO 2013144457A1 FI 2013050359 W FI2013050359 W FI 2013050359W WO 2013144457 A1 WO2013144457 A1 WO 2013144457A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
movement
brake member
inducing means
rotor
Prior art date
Application number
PCT/FI2013/050359
Other languages
French (fr)
Inventor
Ville Hintikka
Original Assignee
Sartorius Biohit Liquid Handling Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sartorius Biohit Liquid Handling Oy filed Critical Sartorius Biohit Liquid Handling Oy
Priority to EP13768512.9A priority Critical patent/EP2830770B1/en
Priority to JP2015502396A priority patent/JP6268160B2/en
Priority to US14/385,710 priority patent/US9387473B2/en
Priority to RU2014143485A priority patent/RU2638367C2/en
Priority to CN201380015604.7A priority patent/CN104169005B/en
Publication of WO2013144457A1 publication Critical patent/WO2013144457A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
    • B01L3/0227—Details of motor drive means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
    • F16D63/006—Positive locking brakes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
    • B01L2200/06—Fluid handling related problems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2400/00—Moving or stopping fluids
    • B01L2400/04—Moving fluids with specific forces or mechanical means
    • B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes

Definitions

  • the problem with this brake structure is that the power consumption is high, which is a disadvantageous feature in a battery powered pipette.
  • a current must be fed to the solenoid and for speeding up the brake and for speeding up its movement, the power of its spring has to be increased, which increases the operational power consumption.
  • the brake mechanism according to the present invention solves the above mentioned problems.
  • the brake actuator according to the invention is used for abrupt stopping of the movement of the actuator that moves the plunger.
  • the brake actuator according to the invention comprises an electromotive functional member that turns a brake part stopping the rotational movement by means of a mediating mechanism.
  • the invention is directed to a brake mechanism for use in an electronic pipette, which mechanism is used for abrupt stopping of the movement of the actuator that moves the plunger.
  • the mechanism comprises a rotatable, essentially circular rotor which is provided at its periphery with brake notches arranged at regular intervals, and a brake actuator comprising an actuating member, a brake member to which a brake cam compatible with the brake notches is connected, a mediation mechanism for transmission of the movement of the motion member to the brake member, the brake member comprising a turnable member connected to the motion member that is arranged to act with the brake member such that the movement of the turnable member can be accelerated before it essentially effects the movement of the brake member.
  • the brake member comprises an opening in which the turnable member is adapted, here a lever (2) that is turnably adapted on a shaft (2a).
  • the shape of the opening is arranged to be such that the turnable member can turn between two locked end positions.
  • the turnable member turns about 180° from one end position to the other.
  • the size of the opening in relation to the turning lever is such that it enables the turning lever to move between the two positions and that depending of the position of the turning lever in the opening, the turning lever forces the brake member to turn around its axis from a locked position to a free position, and from a free position to a locked position.
  • the brake notches of the rotor comprise protrusions for stopping the rotor and slots for locking the rotor in relation to the brake cam.
  • the protrusions in the rotor stop the rotor as the brake cam locks into a slot between two protrusions.
  • the brake cam ends up in the upper or lower brake notch of figure 3 a. When the rotor rotates counter-clockwise, the brake cam locks into the lower notch and when it rotates clockwise in turn into the upper notch.
  • the drive means can be a DC- motor, a linear solenoid or a rotary solenoid.
  • the brake drive means is coupled to the brake member by a mediation mechanism.
  • the configuration according to the invention comprising a mediation mechanism has the first advantage of the brake part locking into both end positions.
  • a second advantage of the solution according to the invention is the high momentary velocity of the brake part physically stopping the movement, i.e. the turnable member.
  • the mediation member between the brake drive means, i.e. the movement-inducing means (the motor), and the brake member enables the brake motor to accelerate before the movement for stopping the brake member rotor begins. Thus, the turning movement of the turnable member reaches its top
  • a third advantage is that due to the kinetic energy accumulated during the acceleration of the drive means, force is gained in the movement of the brake member in the very beginning of the movement, which leads to more reliable opening and closing of the brake.
  • the mediation mechanism functionality according to the invention can be any combination of
  • the brake actuator turns approximately 180 degrees in all, and the brake member stopping the movement turns a fraction of this.
  • the brake member and the brake actuator are coupled to each other with a connecting rod.
  • the brake part reaches its top angular velocity between the two ends of the movement of the brake actuator, the velocity is zero or close to zero at the end positions.
  • the actual brake member stopping the rotation movement is moved by a cam gear mechanism that is simpler than a crank mechanism.
  • An advantage of the invention over the prior art is also that in the structure according to the invention, the brake locks the rotor into place without any clearance causing a movement error.
  • a significant advantage of the structure according to the invention is the ability of the brake to lock into the extreme positions, preventing undesired closing of the brake during running in case of a loss of electricity. This is a very important feature since braking while running at high speed may break the operating mechanism.
  • the brake motor turns the brake member back and forth by means of the mediation mechanism. In a preferred embodiment the brake member turns about 20°. At one end the "barb" of the brake member locks the rotating movement of the rotor and at the other end the rotation is free.
  • Figures 1-4 one technical solution for implementing the function according to the invention is presented.
  • Figure 1 shows the brake member (1) that is attached to the body of the brake at its pivot pin (lb) such that it can turn.
  • the task of the brake cam (la) of the brake member is to stop the rotation of rotor (3) by setting into a brake notch (3a) of the rotor.
  • the turning lever (2) is locked onto the shaft (2a) of the electric motor (not shown) and is so located that at the extreme ends of its movement the brake member is either open or closed. In the situation in figure 1, the brake is closed and the relative location and the geometry of the brake member and the turning lever locks the brake at the position even though the motor is not powered on.
  • FIG 5 the power generation and speed advantage achieved by the mechanism are illustrated.
  • the X-axis represents time and the Y-axis the angular velocity.
  • the motor When the motor is turned on at time tl, it accelerates according to graph A.
  • Graph B illustrates the angular velocity of the brake part.
  • the turning lever hits the brake member at high speed, quickly turning it to its other end position.
  • the movement of the parts stops and the brake is locked at the other end position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Braking Arrangements (AREA)
  • Transmission Devices (AREA)

Abstract

For use in an electronic pipette, a brake mechanism which is used for abruptly stopping the movement of the actuator that moves the plunger, which mechanism comprises a rotatable, essentially circular rotor that is at its periphery provided with brake notches arranged at regular intervals, and a brake actuator comprising a motion inducing means, a brake member (1) to which a brake cam (1la), compatible with the brake notches is connected, a mediation mechanism for transmission of the movement of the motion inducing means to the brake member, the brake member comprising, connected to the motion inducing means, a turnable member (2) that is arranged to act with the brake member such that the movement of the turnable member can be accelerated before it essentially effects the movement of the brake member.

Description

BRAKE MECHANISM FOR AN ELECTRONIC PIPETTE
Background Solutions based on brakeless stepper motors have conventionally been used as an essential part of the operating machinery of electronic pipettes. The combination presented in Finnish patent no. 87740 including an electronic brake, a DC-motor and a closed loop actuator structure with an encoder has proven to be a good one. With such a construction, a better overall outcome for the operation, size and weight of the pi- pette is accomplished, compared to solutions involving a stepper motor. Good properties achieved with this structure are, among others, the ability to stop the motion rapidly, and an advantageous size-weight/speed-power ratio. The brake device mentioned in FI 87740 is implemented with a spring return solenoid structure. The problem with this brake structure is that the power consumption is high, which is a disadvantageous feature in a battery powered pipette. To keep the brake open, a current must be fed to the solenoid and for speeding up the brake and for speeding up its movement, the power of its spring has to be increased, which increases the operational power consumption. The brake mechanism according to the present invention solves the above mentioned problems. The brake actuator according to the invention is used for abrupt stopping of the movement of the actuator that moves the plunger. The brake actuator according to the invention comprises an electromotive functional member that turns a brake part stopping the rotational movement by means of a mediating mechanism.
The invention is directed to a brake mechanism for use in an electronic pipette, which mechanism is used for abrupt stopping of the movement of the actuator that moves the plunger. The mechanism comprises a rotatable, essentially circular rotor which is provided at its periphery with brake notches arranged at regular intervals, and a brake actuator comprising an actuating member, a brake member to which a brake cam compatible with the brake notches is connected, a mediation mechanism for transmission of the movement of the motion member to the brake member, the brake member comprising a turnable member connected to the motion member that is arranged to act with the brake member such that the movement of the turnable member can be accelerated before it essentially effects the movement of the brake member. According to a preferred embodiment the brake member comprises an opening in which the turnable member is adapted, here a lever (2) that is turnably adapted on a shaft (2a). The shape of the opening is arranged to be such that the turnable member can turn between two locked end positions. Preferably, the turnable member turns about 180° from one end position to the other. The size of the opening in relation to the turning lever is such that it enables the turning lever to move between the two positions and that depending of the position of the turning lever in the opening, the turning lever forces the brake member to turn around its axis from a locked position to a free position, and from a free position to a locked position. According to a preferred embodiment the brake notches of the rotor comprise protrusions for stopping the rotor and slots for locking the rotor in relation to the brake cam. The protrusions in the rotor stop the rotor as the brake cam locks into a slot between two protrusions. Depending on the direction of rotation, the brake cam ends up in the upper or lower brake notch of figure 3 a. When the rotor rotates counter-clockwise, the brake cam locks into the lower notch and when it rotates clockwise in turn into the upper notch.
In the brake configuration according to the invention, the drive means can be a DC- motor, a linear solenoid or a rotary solenoid.
In the configuration according to the invention the brake drive means is coupled to the brake member by a mediation mechanism. The configuration according to the invention comprising a mediation mechanism has the first advantage of the brake part locking into both end positions. A second advantage of the solution according to the invention is the high momentary velocity of the brake part physically stopping the movement, i.e. the turnable member. The mediation member between the brake drive means, i.e. the movement-inducing means (the motor), and the brake member enables the brake motor to accelerate before the movement for stopping the brake member rotor begins. Thus, the turning movement of the turnable member reaches its top
speed almost immediately as the movement begins, whereby the brake member hits its target location in the rotating rotor in a more controlled manner. On the other hand, the high velocity of the brake member enables, in terms of functionality, a preferred higher velocity of the stopping part at the braking moment. A third advantage is that due to the kinetic energy accumulated during the acceleration of the drive means, force is gained in the movement of the brake member in the very beginning of the movement, which leads to more reliable opening and closing of the brake.
The mediation mechanism functionality according to the invention can be
implemented with a crank mechanism or a cam gear mechanism. In both mechanisms the brake actuator turns approximately 180 degrees in all, and the brake member stopping the movement turns a fraction of this. In a cam gear mechanism, the brake member and the brake actuator are coupled to each other with a connecting rod. In this mechanism the brake part reaches its top angular velocity between the two ends of the movement of the brake actuator, the velocity is zero or close to zero at the end positions. According to a preferred embodiment, the actual brake member stopping the rotation movement is moved by a cam gear mechanism that is simpler than a crank mechanism.
An advantage of the invention over the prior art is also that in the structure according to the invention, the brake locks the rotor into place without any clearance causing a movement error.
Figure imgf000004_0001
A significant advantage of the structure according to the invention is the ability of the brake to lock into the extreme positions, preventing undesired closing of the brake during running in case of a loss of electricity. This is a very important feature since braking while running at high speed may break the operating mechanism. According to the invention the brake motor turns the brake member back and forth by means of the mediation mechanism. In a preferred embodiment the brake member turns about 20°. At one end the "barb" of the brake member locks the rotating movement of the rotor and at the other end the rotation is free. In Figures 1-4, one technical solution for implementing the function according to the invention is presented. Figure 1 shows the brake member (1) that is attached to the body of the brake at its pivot pin (lb) such that it can turn. The task of the brake cam (la) of the brake member is to stop the rotation of rotor (3) by setting into a brake notch (3a) of the rotor. The turning lever (2) is locked onto the shaft (2a) of the electric motor (not shown) and is so located that at the extreme ends of its movement the brake member is either open or closed. In the situation in figure 1, the brake is closed and the relative location and the geometry of the brake member and the turning lever locks the brake at the position even though the motor is not powered on.
In Figure 2, the motor is switched on and the turning lever has accelerated freely approximately 90° and is about to hit the brake member. In the situation of Figure 3, the turning lever has turned to its other end position and has at the same time turned the brake member into its open position. Also in this position, the brake is locked into position as in figure 1.
In Figure 4 we are in the situation of figure 2 of applying the brake.
In Figure 5, the power generation and speed advantage achieved by the mechanism are illustrated. The X-axis represents time and the Y-axis the angular velocity. When the motor is turned on at time tl, it accelerates according to graph A. Graph B illustrates the angular velocity of the brake part. At time t2 the turning lever hits the brake member at high speed, quickly turning it to its other end position. At time t3 the movement of the parts stops and the brake is locked at the other end position.
\

Claims

Claims
A brake mechanism for use in an electronic pipette, which mechanism is to be used for abrupt stopping of a movement of an actuator that moves a plunger, which mechanism comprises a rotatable, essentially circular rotor (3) that is at its periphery provided with brake notches (3a) arranged at regular intervals, and a brake actuator comprising
- a movement-inducing means,
-a brake member (1) to which a brake cam (la) compatible with the brake notches is connected,
-a mediation mechanism for transmission of the movement of the movement- inducing means to the brake member, the brake member comprising a turnable member (2) connected to the movement-inducing means that is arranged to act with the brake member such that the movement of the turnable member can be accelerated before it essentially effects the movement of the brake member.
The brake mechanism according to claim 1, characterized in, that the turnable member is lockable into two end positions.
The brake mechanism according to claim 1, characterized in, that the movement-inducing means is an electric motor.
The brake mechanism according to claim 1, characterized in, that the turnable member is a lever, and that the brake member comprises an opening for receiving the lever.
The brake mechanism according to claim 4, characterized in that the opening in the brake member is adapted such that the lever can turn between two end positions.
6. The brake mechanism according to claim 5, characterized in that when moving in the opening between said end positions, the turning lever forces the brake member to turn around a pivot (lb) from a position where the brake cam locks the rotor to a position where the rotor is free and vice versa.
PCT/FI2013/050359 2012-03-30 2013-04-02 Brake mechanism for an electronic pipette WO2013144457A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP13768512.9A EP2830770B1 (en) 2012-03-30 2013-04-02 Brake mechanism for an electronic pipette
JP2015502396A JP6268160B2 (en) 2012-03-30 2013-04-02 Electronic pipette brake mechanism
US14/385,710 US9387473B2 (en) 2012-03-30 2013-04-02 Brake mechanism for an electronic pipette
RU2014143485A RU2638367C2 (en) 2012-03-30 2013-04-02 Brake device for electronic pipette
CN201380015604.7A CN104169005B (en) 2012-03-30 2013-04-02 Arrestment mechanism for electronic pipette

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20125372A FI125310B (en) 2012-03-30 2012-03-30 Electric pipette brake mechanism
FI20125372 2012-03-30

Publications (1)

Publication Number Publication Date
WO2013144457A1 true WO2013144457A1 (en) 2013-10-03

Family

ID=49258316

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2013/050359 WO2013144457A1 (en) 2012-03-30 2013-04-02 Brake mechanism for an electronic pipette

Country Status (7)

Country Link
US (1) US9387473B2 (en)
EP (1) EP2830770B1 (en)
JP (1) JP6268160B2 (en)
CN (1) CN104169005B (en)
FI (1) FI125310B (en)
RU (1) RU2638367C2 (en)
WO (1) WO2013144457A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10094161B2 (en) * 2015-05-15 2018-10-09 Vapensystems Inc. Weapons storage system and locking mechanism
US10876585B2 (en) * 2017-08-21 2020-12-29 Hall Labs Llc Parking brake and anti-theft apparatus for vented disc brakes

Citations (4)

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Publication number Priority date Publication date Assignee Title
FI87740B (en) 1990-05-04 1992-11-13 Biohit Oy FOER FARING FOR OVER PIPETTING OVER PIPETTING OVER PIPETTING
EP0801983A1 (en) 1996-04-15 1997-10-22 Labsystems Oy Ratchet pipette
US20020020233A1 (en) 2000-08-03 2002-02-21 Nobuyuki Baba Hybrid pipette
US6532837B1 (en) * 2000-02-03 2003-03-18 Rainin Instrument, Llc Pipette device with tip ejector utilizing stored energy

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US5187990A (en) 1984-02-16 1993-02-23 Rainin Instrument Co., Inc. Method for dispensing liquids with a pipette with compensation for air pressure and surface tension
JPH01210039A (en) * 1988-02-19 1989-08-23 Fuji Photo Film Co Ltd Pipette for partial pipetting
US6254832B1 (en) * 1999-03-05 2001-07-03 Rainin Instrument Co., Inc. Battery powered microprocessor controlled hand portable electronic pipette
CN1267192C (en) * 1999-03-05 2006-08-02 瑞宁器材公司 Improved battery powered microprocessor coutrolled hand poutable electronic pipette
US6428750B1 (en) * 2000-02-17 2002-08-06 Rainin Instrument, Llc Volume adjustable manual pipette with quick set volume adjustment
JP3640904B2 (en) * 2000-08-03 2005-04-20 株式会社ニチリョー Hybrid pipette device
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DE102007006076B4 (en) * 2007-02-02 2008-10-30 Brand Gmbh + Co Kg Multichannel pipetting
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Publication number Priority date Publication date Assignee Title
FI87740B (en) 1990-05-04 1992-11-13 Biohit Oy FOER FARING FOR OVER PIPETTING OVER PIPETTING OVER PIPETTING
EP0801983A1 (en) 1996-04-15 1997-10-22 Labsystems Oy Ratchet pipette
US5879633A (en) * 1996-04-15 1999-03-09 Labsystems Oy Ratchet pipette
US6532837B1 (en) * 2000-02-03 2003-03-18 Rainin Instrument, Llc Pipette device with tip ejector utilizing stored energy
US20020020233A1 (en) 2000-08-03 2002-02-21 Nobuyuki Baba Hybrid pipette

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Title
See also references of EP2830770A4 *

Also Published As

Publication number Publication date
FI125310B (en) 2015-08-31
RU2638367C2 (en) 2017-12-13
US9387473B2 (en) 2016-07-12
CN104169005A (en) 2014-11-26
CN104169005B (en) 2016-06-29
FI20125372A (en) 2013-10-01
JP6268160B2 (en) 2018-01-24
EP2830770A4 (en) 2015-11-25
EP2830770B1 (en) 2018-10-10
RU2014143485A (en) 2016-05-27
EP2830770A1 (en) 2015-02-04
JP2015518417A (en) 2015-07-02
US20150050197A1 (en) 2015-02-19

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