CA1197220A - Actuator for a dosing pump, especially for a paint dosing machine - Google Patents
Actuator for a dosing pump, especially for a paint dosing machineInfo
- Publication number
- CA1197220A CA1197220A CA000421260A CA421260A CA1197220A CA 1197220 A CA1197220 A CA 1197220A CA 000421260 A CA000421260 A CA 000421260A CA 421260 A CA421260 A CA 421260A CA 1197220 A CA1197220 A CA 1197220A
- Authority
- CA
- Canada
- Prior art keywords
- crank
- grab
- pump
- movement
- dosing
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/714—Feed mechanisms for feeding predetermined amounts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
- B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
- B44D3/003—Methods or devices for colour determination, selection or synthesis, e.g. use of colour tables
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Reciprocating Pumps (AREA)
- Medicinal Preparation (AREA)
- Measuring Volume Flow (AREA)
Abstract
Abstract of the Disclosure An actuator for a dosing pump, especially for a paint toning machine, comprising a grab displacing the piston of the dosing pump and a crank lever system for transferring the grab between two extreme positions in which the piston of the dosing pump is located in a position corresponding to an empty pump and in a position corresponding to a full pump. The crank lever system comprises a crank driven by a power element and a connecting rod provided with a grab, the crank being arranged to be located at its dead point with respect to the transfer movement of the grab at least when the grab is located in the extreme position corres-ponding to an empty pump so that the wide range of movement of the crank produces only a small transfer movement of the grab.
Description
The present invention relates to an actuator for a dosing pump, especially for a paint dosing machine, comprising - a grab engaging the piston of the dosing pump, and - a power-driven transfer means for transferring the grab between two extreme positions in which the piston of the dosing pump is located in a position corresponding to an empty pump and a position corres-ponding to a full pump.
When toning paint specific quantities of one or more toners must be added to the basic paint. The toner quantities to be dosed must be very precise in order to obtain a satisfactory toning precision. secause toners are used as strong concentrates and the smallest toner dose therefore is very small, a high precision in the operation of the dos ng pump is required, especially when dosing small doses. When dosing toner, toner is sucked by means of the dosing pump from a toner con-tainer into the pump by displacing the piston over a distance corresponding to the quantity of said dose, whereafter the sucked dose is through a nozzle pressed into a paint can. When the dose is very small, the movement of the piston is correspondingly very small.
To produce such a small movement with a sufficient precision has, however, been difficult when using the present dosing d~vices.
It is previously known to fasten the grap engag-ing the piston of the dosing pump in a vertical belt or screw which is moved by means of an electric motor.
However, such a belt or screw drive requires a preci-sion motor and a precision belt or screw. A step motor offers the possibility to transfer the grap relatively precisely but has a limited number of steps so that one ~1972~0 step corresponds to the smallest dosable toner unit.
In a belt drive operation the movement of the grap is distributed in equally large movement intervals from one extreme position to another.
When small toner doses are concerned corres-ponding to only or a few steps of the step motor, a faulty movement of the step motor corresponding to one step, i.e. the displacement of the grab one dosing unit too little or too much, results in a proportionally considerabl~ bigger faulty toning with respect to the movement interval corresponding to a precise toner dose than when larger toner doses are concerned, which correspond to several steps of the step motor. Although the precision in movement of the step motor and the grap is equal in the entire range of movement of the grab, the toning precision is, because of the foregoing, con-siderably poorer in the beginning of the range of movement.
The object of the present invention is to pro-vide an actuator which eliminates the above mentioned disadvantage and permits to achieve a high toning precision also in the beginning of the range of move-ment of the grab. This object is achieved with the actuator according to the invention which is charac-terized in that - the transfer means comprises a crank mechanism including a crank driven by means of a power element and a transfer element provided with a grab and connect-ed to said crank, and - the crank is arranged to be located at its dead point with respect to the transfer movement of the grab at least when the grab is located in the extreme position corresponding to an empty pump.
The invention is based on the idea that the range of movement of the power element required for small toner doses for transferring the grap over a distance corresponding to one dose is enlarged as com-11~7;~
pared to the ranye of movement of the power elementrequired for larger doses. When using an e]ectric motor as power element, this means that the range of movement of the motor is enlarged per toner unit in the beginning of the range of movement of the grab, whereby the share of any faulty movement of a range of movement corresponding to a full dose is reduced and the precision of the toner dose is in a corresponding manner increased. This can be simply realized by means of a crank mechanism by utilizing the fact that the relatively wide range of movement of the crank at the dead point of the crank causes a relatively small movement only in the grab. Thus, the wider range of movement of the crank results in a more precise dis-tance of movement of the grab and, in a corresponding manner, the toning precision is substantially improved.
When using larger toner doses, the distance of movement of the grab is more inaccurate due to the smaller range of movement of the crank but the absolute toning preci-sion remains the same as when using small toner doses.
In this way, a higher toning precision is achieved also when using small toner doses without requiring a precision mctor. Instead of an electric motor, a hand crank can be used as power element because such a wide setting area is obtained for dosing small toner doses that the setting scale for the hand crank will be sufficiently clear for a precise visual setting. In the same way as in a motor drive, a small faulty movement of the hand crank does not substantially re-duce the toning precision even when using small ~oner doses.
The invention will be described in more detail in the following with reference to the accompanying drawings in which Figure 1 illustrates schematically the operating principle of the dosing device of the toning machine, 11972~0 Figures 2, 3 and q illustrate on an enlarged scale a motor-driven embodiment of an actuator accor-ding to the invention in the lower dead point position, central position and upper dead point position, respec-tively, Figure 5 shows a hand-operated embodiment of the actuator, and Figure 6 shows an alternative embodiment of the actuator.
A separate dosing pump 2 is installed for each toner container 1 in the dosing machine. By means of said pump, toner is dosed through a valve 3 into a nozzle 4 and further into a paint can 5 to be toned.
A common actuator 6 is installed on the machine frame for driving the pumps. When toning, said actuator is transferred to the pump dosing in each particular case and is brought into engagement with the piston rod 7 of this pump for displacing the piston.
The actuator comprises a crank 9 which is rota-tably mounted in a machine frame 8 and is articulated to a connecting rod 10 connected at its upper end to a grab 11 slideably mounted on a vertical guide 12. To the crank is fastened a drive pulley 13 rotated by an electric motor 14. The electric motor is a conventional micromotor, for example, an automobile windscreen wiper motor.
The crank and the connecting rod are dimensioned and arranged so that the crank is located at its lower dead point when the grab 11 is located at the lower extreme position of its path of movement where it is ready to engage the piston rod located at its lowermost position, as shown in Figure 2, and so that the crank is located at its upper dead point when the grab 11 is located in the upper extreme position II of its path of movement where it has displaced the piston rod to the uppermost position, as shown in Figure 4. The li9~Z;~O
quantity of a toner dose to be sucked into the pump thus depends on the distance over which the piston is displaced upwards from the lower extreme position of the piston rod. Of course, the dose is at its largest when the piston rod is located in the upper extreme position.
It will be noted that when the crank is located close to its lower dead point, a relatively large area of movemento~ o~ the crank causes only a relatively small lifting movement H for the connecting rod. Thus, a faulty movement of the crank, i.e. the rotation of the crank somewhat more or less than the desired theoretical xange of movement, in which the desired toner dose is obtained, causes a very small inaccuracy in the toner dose. As the crank rotates farther away from the dead point, the ever smaller range of movement of the crank causes a lifting movement of said size in the connecting rod whereby a faulty movement of the crank causes an ever increasing error in the lifting movement. However, because an ever larger toner dose is concerned, the inaccuracy in the dose will be sub-stantially as small as in smaller toner doses, i.e.
the absolute toning precision remains the same in the entire dosing area of the pump. Thus, a conventional electric motor can be used as rotary motor for the crank.
Instead of an electric motor, a hand crank 15, Fig. 5, can be used as power element for the crank.
The setting scale 1~ which is associated with the crank and which indicates to which point the crank must be rotated for sucking into the pump a toner dose re-quired in each particular case can, in the critical initial area corresponding to small toner doses, be provided with a sufficiently rough scale for a quick and precise visual setting of the crank.
~lg~
The drawing and the description associated therewi-th are only intended to illustrate the idea of -the invention. In its details, the actuator according to the invention may vary considerably within the scope of the claims. Thus, it is possible to use, instead of or in addition to the separate hand crank 15 shown in Figure 5, a hand crank secured directly as an extension of shaft of the crank 9. Similarly, it is possible provide the crank mechanism with another structure than a connecting rod 10, for example, by replacing the connectiny rod with a slide structure, in which the slide 17 is fastened to the grab and the outer end of the crank 9 is mounted on horizontal guides 18 in the slide, as illustrated in Figure 6. The slide is verti-cally movable on the guide 12.
When toning paint specific quantities of one or more toners must be added to the basic paint. The toner quantities to be dosed must be very precise in order to obtain a satisfactory toning precision. secause toners are used as strong concentrates and the smallest toner dose therefore is very small, a high precision in the operation of the dos ng pump is required, especially when dosing small doses. When dosing toner, toner is sucked by means of the dosing pump from a toner con-tainer into the pump by displacing the piston over a distance corresponding to the quantity of said dose, whereafter the sucked dose is through a nozzle pressed into a paint can. When the dose is very small, the movement of the piston is correspondingly very small.
To produce such a small movement with a sufficient precision has, however, been difficult when using the present dosing d~vices.
It is previously known to fasten the grap engag-ing the piston of the dosing pump in a vertical belt or screw which is moved by means of an electric motor.
However, such a belt or screw drive requires a preci-sion motor and a precision belt or screw. A step motor offers the possibility to transfer the grap relatively precisely but has a limited number of steps so that one ~1972~0 step corresponds to the smallest dosable toner unit.
In a belt drive operation the movement of the grap is distributed in equally large movement intervals from one extreme position to another.
When small toner doses are concerned corres-ponding to only or a few steps of the step motor, a faulty movement of the step motor corresponding to one step, i.e. the displacement of the grab one dosing unit too little or too much, results in a proportionally considerabl~ bigger faulty toning with respect to the movement interval corresponding to a precise toner dose than when larger toner doses are concerned, which correspond to several steps of the step motor. Although the precision in movement of the step motor and the grap is equal in the entire range of movement of the grab, the toning precision is, because of the foregoing, con-siderably poorer in the beginning of the range of movement.
The object of the present invention is to pro-vide an actuator which eliminates the above mentioned disadvantage and permits to achieve a high toning precision also in the beginning of the range of move-ment of the grab. This object is achieved with the actuator according to the invention which is charac-terized in that - the transfer means comprises a crank mechanism including a crank driven by means of a power element and a transfer element provided with a grab and connect-ed to said crank, and - the crank is arranged to be located at its dead point with respect to the transfer movement of the grab at least when the grab is located in the extreme position corresponding to an empty pump.
The invention is based on the idea that the range of movement of the power element required for small toner doses for transferring the grap over a distance corresponding to one dose is enlarged as com-11~7;~
pared to the ranye of movement of the power elementrequired for larger doses. When using an e]ectric motor as power element, this means that the range of movement of the motor is enlarged per toner unit in the beginning of the range of movement of the grab, whereby the share of any faulty movement of a range of movement corresponding to a full dose is reduced and the precision of the toner dose is in a corresponding manner increased. This can be simply realized by means of a crank mechanism by utilizing the fact that the relatively wide range of movement of the crank at the dead point of the crank causes a relatively small movement only in the grab. Thus, the wider range of movement of the crank results in a more precise dis-tance of movement of the grab and, in a corresponding manner, the toning precision is substantially improved.
When using larger toner doses, the distance of movement of the grab is more inaccurate due to the smaller range of movement of the crank but the absolute toning preci-sion remains the same as when using small toner doses.
In this way, a higher toning precision is achieved also when using small toner doses without requiring a precision mctor. Instead of an electric motor, a hand crank can be used as power element because such a wide setting area is obtained for dosing small toner doses that the setting scale for the hand crank will be sufficiently clear for a precise visual setting. In the same way as in a motor drive, a small faulty movement of the hand crank does not substantially re-duce the toning precision even when using small ~oner doses.
The invention will be described in more detail in the following with reference to the accompanying drawings in which Figure 1 illustrates schematically the operating principle of the dosing device of the toning machine, 11972~0 Figures 2, 3 and q illustrate on an enlarged scale a motor-driven embodiment of an actuator accor-ding to the invention in the lower dead point position, central position and upper dead point position, respec-tively, Figure 5 shows a hand-operated embodiment of the actuator, and Figure 6 shows an alternative embodiment of the actuator.
A separate dosing pump 2 is installed for each toner container 1 in the dosing machine. By means of said pump, toner is dosed through a valve 3 into a nozzle 4 and further into a paint can 5 to be toned.
A common actuator 6 is installed on the machine frame for driving the pumps. When toning, said actuator is transferred to the pump dosing in each particular case and is brought into engagement with the piston rod 7 of this pump for displacing the piston.
The actuator comprises a crank 9 which is rota-tably mounted in a machine frame 8 and is articulated to a connecting rod 10 connected at its upper end to a grab 11 slideably mounted on a vertical guide 12. To the crank is fastened a drive pulley 13 rotated by an electric motor 14. The electric motor is a conventional micromotor, for example, an automobile windscreen wiper motor.
The crank and the connecting rod are dimensioned and arranged so that the crank is located at its lower dead point when the grab 11 is located at the lower extreme position of its path of movement where it is ready to engage the piston rod located at its lowermost position, as shown in Figure 2, and so that the crank is located at its upper dead point when the grab 11 is located in the upper extreme position II of its path of movement where it has displaced the piston rod to the uppermost position, as shown in Figure 4. The li9~Z;~O
quantity of a toner dose to be sucked into the pump thus depends on the distance over which the piston is displaced upwards from the lower extreme position of the piston rod. Of course, the dose is at its largest when the piston rod is located in the upper extreme position.
It will be noted that when the crank is located close to its lower dead point, a relatively large area of movemento~ o~ the crank causes only a relatively small lifting movement H for the connecting rod. Thus, a faulty movement of the crank, i.e. the rotation of the crank somewhat more or less than the desired theoretical xange of movement, in which the desired toner dose is obtained, causes a very small inaccuracy in the toner dose. As the crank rotates farther away from the dead point, the ever smaller range of movement of the crank causes a lifting movement of said size in the connecting rod whereby a faulty movement of the crank causes an ever increasing error in the lifting movement. However, because an ever larger toner dose is concerned, the inaccuracy in the dose will be sub-stantially as small as in smaller toner doses, i.e.
the absolute toning precision remains the same in the entire dosing area of the pump. Thus, a conventional electric motor can be used as rotary motor for the crank.
Instead of an electric motor, a hand crank 15, Fig. 5, can be used as power element for the crank.
The setting scale 1~ which is associated with the crank and which indicates to which point the crank must be rotated for sucking into the pump a toner dose re-quired in each particular case can, in the critical initial area corresponding to small toner doses, be provided with a sufficiently rough scale for a quick and precise visual setting of the crank.
~lg~
The drawing and the description associated therewi-th are only intended to illustrate the idea of -the invention. In its details, the actuator according to the invention may vary considerably within the scope of the claims. Thus, it is possible to use, instead of or in addition to the separate hand crank 15 shown in Figure 5, a hand crank secured directly as an extension of shaft of the crank 9. Similarly, it is possible provide the crank mechanism with another structure than a connecting rod 10, for example, by replacing the connectiny rod with a slide structure, in which the slide 17 is fastened to the grab and the outer end of the crank 9 is mounted on horizontal guides 18 in the slide, as illustrated in Figure 6. The slide is verti-cally movable on the guide 12.
Claims (7)
1. An actuator for a dosing pump, especially for a paint toning machine, comprising - a grab engaging the piston of the dosing pump, and - a power-driven transfer means for transferring the grab between two extreme positions (I, II) in which the piston of the dosing pump is located in a position corres-ponding to an empty pump and a position corresponding to a full pump, characterized in that - the transfer means comprises a crank mechanism including a crank driven by means of a power element and a transfer element provided with a grab and connected to said crank and - the crank is arranged to be located at its dead point with respect to the transfer movement of the grab at least when the grab is located in the extreme position corresponding to an empty pump.
2. An actuator according to claim 1, characterized in that the transfer element comprises a connecting rod rotatably connected to the outer end of the crank
3. An actuator according to claim 2, characterized in that the grab in the connecting rod is mounted for movement along a guide parallel to the movement of the piston.
4. An actuator according to claim 1, characterized in that the transfer element comprises a slide in which the outer end of the crank is movably mounted on a guide and which is mounted for movement along a vertical guide.
5. An actuator according to claim 1, characterized in that power element rotating the crank comprises an electric motor.
6. An actuator according to claim 1, characterized in that the power element rotating the crank comprises a hand crank.
7. An actuator according to claims 1, 3 or 4, characterized in that the crank is arranged to be located at its second dead point with respect to the transfer movement of the grab when the grab is located in the extreme position corresponding to a full pump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI820432 | 1982-02-10 | ||
| FI820432A FI820432L (en) | 1982-02-10 | 1982-02-10 | MANUFACTURING MANUFACTURING SYSTEM, SPECIFIC FOER END |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1197220A true CA1197220A (en) | 1985-11-26 |
Family
ID=8515098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000421260A Expired CA1197220A (en) | 1982-02-10 | 1983-02-09 | Actuator for a dosing pump, especially for a paint dosing machine |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS58151519A (en) |
| AU (1) | AU1075083A (en) |
| CA (1) | CA1197220A (en) |
| DE (1) | DE3302836A1 (en) |
| DK (1) | DK50683A (en) |
| FI (1) | FI820432L (en) |
| FR (1) | FR2521226A1 (en) |
| GB (1) | GB2114680A (en) |
| IT (1) | IT1161573B (en) |
| NO (1) | NO830428L (en) |
| SE (1) | SE8300581L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110090771A (en) * | 2019-06-05 | 2019-08-06 | 舜宇光学(中山)有限公司 | Camera lens component automatic oiling device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1388087A (en) * | 1920-01-09 | 1921-08-16 | Charles H Bach | Pump |
| FR1027307A (en) * | 1950-11-07 | 1953-05-11 | Pump for the injection of metered volumes of a liquid | |
| DE938406C (en) * | 1953-09-04 | 1956-01-26 | Suemak Sueddeutsche Maschinen | Device for filling liquids, in particular milk |
| FR1365499A (en) * | 1963-05-24 | 1964-07-03 | Device for dispensing liquids in doses | |
| JPS524518B2 (en) * | 1971-09-16 | 1977-02-04 | ||
| SE370440B (en) * | 1973-02-28 | 1974-10-14 | Lkb Produkter Ab | |
| SE371370B (en) * | 1973-03-29 | 1974-11-18 | Swelab Instrument Ab | |
| JPS5035750U (en) * | 1973-07-27 | 1975-04-15 | ||
| US4120202A (en) * | 1977-03-15 | 1978-10-17 | Baxter Travenol Laboratories, Inc. | Positive displacement pump |
| DE7934993U1 (en) * | 1979-12-12 | 1980-05-08 | Friedrich, Maximilian, 8331 Mitterskirchen | DOSING DEVICE |
-
1982
- 1982-02-10 FI FI820432A patent/FI820432L/en not_active Application Discontinuation
-
1983
- 1983-01-25 AU AU10750/83A patent/AU1075083A/en not_active Abandoned
- 1983-01-27 GB GB08302262A patent/GB2114680A/en not_active Withdrawn
- 1983-01-28 DE DE19833302836 patent/DE3302836A1/en not_active Ceased
- 1983-02-03 SE SE8300581A patent/SE8300581L/en not_active Application Discontinuation
- 1983-02-07 DK DK50683A patent/DK50683A/en not_active Application Discontinuation
- 1983-02-08 JP JP58018233A patent/JPS58151519A/en active Pending
- 1983-02-09 CA CA000421260A patent/CA1197220A/en not_active Expired
- 1983-02-09 IT IT19492/83A patent/IT1161573B/en active
- 1983-02-09 FR FR8302026A patent/FR2521226A1/en not_active Withdrawn
- 1983-02-09 NO NO830428A patent/NO830428L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI820432L (en) | 1983-08-11 |
| SE8300581D0 (en) | 1983-02-03 |
| DK50683A (en) | 1983-08-11 |
| JPS58151519A (en) | 1983-09-08 |
| DE3302836A1 (en) | 1983-09-01 |
| AU1075083A (en) | 1983-08-18 |
| SE8300581L (en) | 1983-08-11 |
| IT8319492A0 (en) | 1983-02-09 |
| FR2521226A1 (en) | 1983-08-12 |
| DK50683D0 (en) | 1983-02-07 |
| GB2114680A (en) | 1983-08-24 |
| NO830428L (en) | 1983-08-11 |
| GB8302262D0 (en) | 1983-03-02 |
| IT1161573B (en) | 1987-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |