JP2018011944A - Lubricant supply device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further improve a well-known lubricant supply device in order to secure controlled lubrication of a lubrication point of a sewing machine, and in order to prevent undesirable leakage of the lubricant as much as possible.SOLUTION: A lubricant supply device for sewing machine includes: at least one lubricant container for storing a lubricant; at least one lubricant supply line for supplying the lubricant at least at one lubrication point of a sewing machine from the lubricant container; and at least one pump unit for supplying the lubricant. The at least one pump unit is associated with the at least one lubricant supply line, and the at least one lubricant supply line has a lubricant buffer and a distribution element for buffering and distributing the lubricant at an end part close to the lubrication point.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sewing machine lubricant supply device and a sewing machine equipped with this type of lubricant supply device.

  A lubricant supply device for a sewing machine is known from Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4.

DE10 2004 018 065 B3 DE 196 43 960 A1 DE 18 47 263 U DE 37 07 801 A1

  The present invention is based on the object of further developing known lubricant supply devices in order to ensure controlled lubrication of the lubrication point of the sewing machine and at the very least possible prevention of unwanted leakage of the lubricant. .

  According to the invention, this object is achieved by a lubricant supply device according to claim 1 and a method for lubricating a lubricating point according to claim 6.

  The lubricant supply device according to the present invention supplies at least one lubricant container for storing lubricant, and supplies the lubricant from the lubricant container to at least one lubrication point (especially a looper or needle bar) of the sewing machine. At least one lubricant supply line and at least one pump unit for supplying the lubricant, the at least one pump unit being coupled to at least one lubricant supply line, One lubricant supply line has a lubricant buffering and dispensing element at the end near the lubrication point for buffering and dispensing the lubricant. The lubricant cushioning and dispensing element is arranged at the end near the lubrication point adjacent to the lubrication point, where the lubricant cushioning and dispensing element contacts the lubrication point or several millimeters (especially less than 1 mm, especially less than 3 mm, There is a slight distance (especially less than 5 mm). This should be noted. Lubricant transfer takes place between the lubricant buffering and dispensing element and the lubrication point. The lubricant supply line from the lubricant buffer and distribution element to the lubrication point can be omitted. Advantageously, the at least one pump unit is coupled to the at least one lubricant supply line such that the at least one pump unit is arranged between the at least one lubricant container and the at least one lubrication point. Depending on the respective boundary conditions for lubrication, it is advantageous if one pump unit is coupled to one lubricant supply line or one pump unit is coupled to at least two lubricant supply lines. is there. In an alternative embodiment, at least two pump units may be coupled to at least two lubricant supply lines. The cost of providing at least one pump unit can be minimized depending on the respective lubrication requirements. The lubricant buffering and dispensing element allows the lubricant to be stored at the end of the lubricant supply line near the lubrication point and supplied in small quantities to the lubrication point. This ensures sufficient lubrication of the lubrication point while preventing unwanted leakage of the lubricant. The lubricant buffering and dispensing element may be configured as a reservoir in which the lubricant is temporarily restrained and / or as an intermediate storage supply volume. This type of reservoir can store the lubricant using, for example, capillary forces or other inherent absorbency. This type of supply volume may for example be configured as an annular groove in the bearing body in the region of the lubrication point.

  Depending on the boundary conditions for lubrication, one lubricant container is coupled to one lubrication point, or one lubricant container is coupled to at least two lubrication points, or at least two lubricants Advantageously, the container is coupled to at least two lubrication points.

  Advantageously, the lubricant buffering and dispensing element is configured as an annular buffer volume in which the lubricant is temporarily stored.

  The lubricant supply device according to claim 2, wherein the pump unit is configured as a micro pump. Advantageously, the micropump is a reciprocating piston pump, an annular gap pump, a diaphragm pump, a magnetic metering pump, a centrifugal pump, a force pump, a compressed air diaphragm pump, or generally a conventionally known reciprocating rotary type, or comparable It may be a pump.

  In an advantageous embodiment of the micropump as a reciprocating piston pump, the reciprocating piston pump can have an integrally formed casing. An actuator in the form of a lifting magnet can be arranged in the casing. The aforementioned lifting magnet may be operatively connected to the piston via a piston rod. The piston may be guided in a sealed manner along the inner casing wall. The reciprocating piston and casing can define a pump chamber. The casing further includes a lubricant inlet opening for sending lubricant from the lubricant container to the pump chamber, and a lubricant discharge opening for discharging the lubricant from the pump chamber to the lubrication point of the sewing machine. Good.

  Advantageously, the lubricant inlet opening and the lubricant discharge opening may be arranged in a common plane. Alternatively, the lubricant inlet opening and the lubricant discharge opening may be arranged perpendicular to each other.

  Advantageously, each of the lubricant inlet opening and the lubricant discharge opening is provided with a check valve.

  The lubricant supply device according to claim 3 is provided with a control unit in signal connection with the pump unit. Control of the pump unit ensures an improved and leak-free supply of the lubricant to the lubrication point.

  5. The lubricant supply device according to claim 4, wherein at least one sensor for detecting an operation parameter of the sewing machine is provided, and these sensors are signal-connected to the control unit. At least one of the sensors may be a temperature sensor, a humidity sensor, or a stitch number sensor.

  6. The lubricant supply device according to claim 5, wherein the lubricant buffering and dispensing elements are configured as felt pieces or wicks. Advantageously, the felt pieces and / or wicks can consist of natural fibers such as cotton or synthetic fibers made of plastic material. The lubricant buffering and dispensing elements may be formed integrally as felt pieces or wicks, respectively. Alternatively, the lubricant buffering and dispensing element may be formed from a plurality of parts. The lubricant buffering and dispensing element may also be configured in the form of a sponge and / or foam. A suitable plastic material for the lubricant buffering and dispensing element is polyurethane.

  The lubricant cushioning and dispensing element may be produced from a combination of felt pieces and wicks. The use of felt pieces and / or wicks ensures a particularly simple and cost-effective embodiment of the lubricant buffering and dispensing element.

  Another object of the present invention is to provide a method for lubricating the sewing point of the sewing machine, which provides a sufficient and leak-free lubrication of the sewing point of the sewing machine. This is achieved by a method having the features of claim 6.

  It is advantageous to provide time control of the pump unit according to claim 7. This ensures a periodic or non-periodic supply of lubricant to the lubrication point.

  In the case of periodic supply of lubricant by the pump unit according to claim 8, the lubricant is supplied at predetermined or selected time intervals. For example, the metering pump can be switched on every 45 operating hours, in particular every 15 operating hours, in particular every 1 operating hour, for 20 seconds, in particular 15 seconds, in particular 10 seconds, in particular 2 seconds. The pump unit can supply the lubricant periodically, for example, at 1 stroke or more, 5 strokes or more, or 10 strokes or more during the operation time of the pump unit. A single stroke can supply, for example, less than 10 μl, less than 50 μl, or less than 200 μl of lubricant.

  It is advantageous to ensure a supply according to the consumption of the lubricant according to claim 9. Supply according to the amount of lubricant consumed helps to avoid lubricant leakage at the point of lubrication due to the excess amount of lubricant.

  Advantageously, at least one sensor for detecting at least one operating parameter of the sewing machine according to claim 10 is provided for this purpose. Thereby, the pump unit can be controlled in accordance with the detected operating parameter value. Conveniently, it is the number of stitches detected and the pump unit is switched on after a defined number of stitches. For example, 5 million, in particular 1 million, in particular 100,000 stitches, for a prescribed 20 seconds, in particular 15 seconds, in particular 10 seconds, in particular 2 seconds. The pump unit may be configured to supply a very small amount of lubricant per unit time, for example one drop per day.

  The lubricant supply device according to any one of claims 1 to 5 can be combined with the lubrication method according to any one of claims 6 to 10.

  Accordingly, the same applies to the sewing machine according to claim 11.

  Details of the present invention will become apparent from the following description of the figures.

It is a schematic front view of a sewing machine provided with the lubricant supply apparatus of this invention. The schematic sectional front view of the lubricant supply apparatus with respect to a needle bar is shown. A schematic cross-sectional front view of the lubricant supply device for the looper is shown. The schematic sectional front view of another lubricant supply apparatus with respect to a looper is shown. 2 shows an embodiment of the lubricant supply device according to FIG. Fig. 4 shows another embodiment of the lubricant supply device according to Fig. 3. FIG. 3 shows a schematic view of an embodiment of the pump unit according to FIG. 2. Fig. 3 shows a schematic view of another embodiment of the pump unit according to Fig. 2;

  The sewing machine 1 provided with a lubricant supply device is configured by a C-shaped housing having a shell-shaped base plate 3 accessible from below and a stand 4 adjacent to the base plate 3 at the upper side. Adjacent to the stand 4 is an arm 5 which is arranged substantially perpendicular to it and extends substantially parallel to the base plate 3, and the arm 5 terminates in a head 6. In the head 6, a crank driving device (not shown) is arranged in a needle bar 7 schematically shown for driving the vertical movement, and the needle bar 7 is in the form of an axial guide or a radial bearing. At least one lubrication point 8. The crank drive device can be driven by an arm shaft (not shown) attached to the arm 5, and the arm shaft is attached to the base plate 3 for rotation via a toothed belt drive device (not shown). Drive coupled to a shaft (not shown). Arranged on the base plate 3 are further components of the sewing machine 1, such as the schematically illustrated looper 9 mounted for rotation. The looper 9 has at least one general lubrication point 10. The looper is connected to a drive motor (not shown) by a shaft (not shown). The drive motor is in signal connection with the control electronics system 11. The stand 4 is provided with a lubricant container 12 fluidly connected to the first and second pump units 13 and 14 via a lubricant supply line 15. The lubrication point 8 is fluidly connected to the first pump unit 13 via the lubricant supply line 15. Accordingly, the pump unit 13 is disposed between the lubricant container 12 and the lubrication point 8 along the lubricant supply line 15. The lubrication point 10 is fluidly connected to the second pump unit 14 via a lubricant supply line 15. Accordingly, the pump unit 14 is disposed between the lubricant container 12 and the lubrication point 10 along the lubricant supply line 15.

  The design and function of the lubricant supply device 2 is described below with reference to FIG. 2 using an example of supplying lubricant to the needle bar 7. It should be noted that the design and function of the lubricant supply device 2 described below applies to other lubrication points in the sewing machine 1 as well. Similarly designed components are indicated with the same reference numbers as used in FIG.

  The lubricant supply device 2 shown in FIG. 2 has a pump unit 13 that is fluidly connected to the lubricant container 12 via a lubricant supply line 15. The lubricant 16 is supplied from the lubricant container 12 to the lubrication point 8 of the needle bar 7 by the pump unit 13. Depending on the boundary conditions to be observed for lubrication, the lubricant 16 used may be lubricating oil or lubricating grease. As an example, the pump unit 13 shown in FIG. 2 is configured as a reciprocating piston pump. Alternatively, the pump unit 13 may be an annular gap pump, a diaphragm pump, a magnetic metering pump, a centrifugal pump, a pressure pump, a compressed air diaphragm pump, or a generally known reciprocating rotary positive displacement pump, or the like. It is a pump. Regardless of its design, the pump unit 13 is configured as a micropump. The illustrated pump unit 13 has a pump casing 17. An actuator 18 operatively connected to the piston 20 via a piston rod 19 is disposed in the pump casing 17. Further, the pump casing 17 includes a lubricant inlet opening 21 and a lubricant discharge opening 22. Each of the lubricant inlet opening 21 and the lubricant discharge opening 22 is provided with a respective check valve 23 that ensures the supply of the lubricant 16 from the lubricant container 12 to the lubrication point 8. Connection elements (not shown) for connecting the pump unit 13 to the lubricant supply line 15 are arranged adjacent to the lubricant inlet opening 21 and the lubricant discharge opening 22, respectively. The connecting element can be configured in various designs. It can be configured to form a detachable connection by methods such as plug-in connectors, bayonet connectors, screw connectors, or non-detachable connections by methods such as adhesive joints, shrink joints. A lubricant buffering and dispensing element 24 is arranged at the lubricant side end of the lubricant supply line 15, and the lubricant buffering and dispensing element 24 ensures the lubrication of the needle bar 7 at its lubrication point 8. In this process, initially the lubricant 16 is supplied to the lubricant buffering and dispensing element 24 by the pump unit 13. In the lubricant buffering and dispensing element 24, the lubricant 16 is temporarily stored and supplied to the lubrication point 8 at a defined dose, thus preventing leakage due to an excessive amount of lubricant. Suitable lubricants 16 include lubricating oil or lubricating grease. If lubricating oil is used, the lubricant buffering and dispensing element 24 is configured as a core such as a felt piece and / or a capillary braid structure such as a capillary mesh. If the lubricant 16 used is lubricating grease, the lubricant buffering and dispensing element 24 is configured as an annular gap with a capillary mesh such as a felt piece.

  The basic principle of diffusing the lubricant 16 regardless of the use of lubricating oil or lubricating grease will be described below. Lubricant 16 is absorbed by capillary forces and temporarily stored in lubricant buffering and dispensing element 24. When the lubricant buffer and dispensing element 24 becomes supersaturated with the lubricant 16, the lubricant is dispensed to the lubrication point 8. For this application, a lubricant 16 with good flow properties is particularly advantageous. Regardless of the lubricant selected, the lubricant buffering and dispensing element 24 is located at the lubrication point 8 adjacent to the needle bar 7 and moves the lubricant 16 from the lubricant buffering and dispensing element 24 to the needle bar 7. The lubricant buffering and dispensing element 24 at least partially surrounds the needle bar or surrounds the entire circumference of the needle bar 7. Thus, the lubricant buffering and dispensing element 24 forms an annular buffer volume in which the lubricant is temporarily stored.

  The design and function of the lubricant supply device 2 will be described below with reference to FIG. 3 using an example of supplying the lubricant to the looper 9. The design and function of the lubricant supply device 2 described below also applies to other lubrication points of the sewing machine 1 as well. Similarly designed components are indicated with the same reference numbers as used in FIGS.

  The lubricant supply device 2 shown in FIG. 3 includes a pump unit 14 that is fluidly connected to the lubricant container 12 via a lubricant supply line 15. The lubricant 16 is supplied from the lubricant container 12 to the lubrication point 10 of the looper 9 by the pump unit 14. As an example, the pump unit 14 is configured as a reciprocating piston pump. Alternatively, the pump unit may be configured as an annular gap pump, a diaphragm pump, a magnetic metering pump, a centrifugal pump, a pressure pump, a compressed air diaphragm pump, or a generally reciprocating rotary displacement pump or a pump of conventionally known design. . Regardless of its design, the pump unit 14 is configured as a micropump. The illustrated pump unit 14 has a pump casing 17. The pump casing 17 is provided with an actuator 18 operatively connected to the piston 20 via a piston rod 19. The pump casing 17 further has a lubricant inlet opening 21 and a lubricant discharge opening 22. Both the lubricant inlet opening 21 and the lubricant discharge opening 22 are each provided with a check valve 23 that ensures the supply of the lubricant 16 from the lubricant container 12 to the lubrication point 10. Connection elements (not shown) for connecting the pump unit 14 to the lubricant supply line 15 are arranged adjacent to the lubricant inlet opening 21 and the lubricant discharge opening 22, respectively. The connecting element can be configured in various designs. It can be configured to form detachable connections such as plug-in connectors, bayonet connectors, screw connectors, etc., or to form non-detachable connections such as adhesive joints, shrink joints, etc. . The lubricant supply line 15 extends from the lubricant discharge opening 22 of the pump unit 14 to the looper casing 30. The looper casing 30 is provided with a looper casing bore hole 31, and the lubricant supply line 15 is guided through the looper casing bore hole 31. The looper casing 30 is provided with an oil washer 32. The oil washer 32 is placed on a spring washer (not shown), and the spring washer is then placed on the deep groove ball bearing 40. The oil washer 32 is fixed so as not to rotate. The lubricant supply line 15 guides the lubricant 16 to the oil washer 32 through the looper casing bore hole 31. The oil washer 32 is provided with an oil washer bore hole 34, through which the lubricant supply line 15 is guided to a container 35 for lubricant buffering and distribution elements in the oil washer 32. Is done. In the container 35, the lubricant buffering and dispensing element 24 is arranged such that the lubricant 16 is temporarily stored in this position. The looper 9 is arranged coaxially with the oil washer 32 of the looper shaft 33, but is connected to the looper shaft 33 in a non-fitted manner. The looper 9 has a looper bore hole 37 that is inclined with respect to the looper shaft 36 of the looper shaft 33. The inclined looper bore hole 37 is disposed adjacent to the container 35 of the oil washer 32 and communicates with the lubrication point 10 of the looper track 38. The looper track 38 is disposed between the looper 9 and the bobbin casing 39.

  Lubricant 16 may first be supplied to lubricant buffering and dispensing element 24 by pump unit 14. In the lubricant buffering and dispensing element 24, the lubricant 16 is temporarily stored. The looper 9 is rotated by the rotation of the looper shaft 33, and therefore the lubricant 16 is supplied to the lubrication point 10 of the looper track 38 through the inclined looper bore hole 37 by a centrifugal force in a specified amount. Leakage due to an excessive amount of lubricant is avoided.

  When the lubricant 16 is a lubricant, the lubricant cushioning and dispensing element 24 is configured as a capillary braid structure such as a wick and / or a capillary mesh such as a felt piece.

  The diffusion of the lubricant 16 regardless of the use of the lubricating oil or lubricating grease will be described below. Lubricant 16 is absorbed by capillary forces and temporarily stored in lubricant buffering and dispensing element 24. When the lubricant buffer and distribution element 24 becomes supersaturated with the lubricant 16, the lubricant is distributed to the lubrication point 10 by the centrifugal force resulting from the rotation of the looper 9. For this application, a lubricant 16 with good flow properties is particularly advantageous. Regardless of the lubricant selected, the lubricant buffering and dispensing element 24 is configured in a ring shape so that an annular buffer volume is formed. The lubricant buffering and dispensing element 24 is arranged in a container 35 provided on the circumference of the oil washer 32.

  The design and function of the lubricant supply device 2 will be described below with reference to FIG. 4, using an alternative lubricant supply example for the looper 9. The design and function of the lubricant supply device 2 described below can be similarly applied to other lubrication points of the sewing machine 1. Similarly designed components are indicated with the same reference numbers as used in FIGS.

  In contrast to the exemplary embodiment of FIG. 3, the lubricant supply line 15 extends directly from the lubricant discharge opening 22 to the looper 9. The looper bore hole 41 allows lubricant to be supplied from the lubricant intermediate storage device 42 to the lubrication point 10 in the looper track 38. Lubricant is supplied from the lubricant intermediate storage device 42 to the lubricant buffering and dispensing element 24 and temporarily, for example, via the looper bore hole 41, the looper track 38 and the inclined looper bore hole 37 while the looper 9 is stopped. Stored. This occurs as long as the looper bore hole 41 is in communication with the lubricant intermediate storage device 42.

  The storage and diffusion of the lubricant 16 is equivalent to the exemplary embodiment according to FIG.

  Even during the rotation of the looper 9, a connecting element (not shown) may be provided to ensure a leak-free connection between the looper bore hole 41 and the lubricant intermediate storage device. This connecting element may be connected directly to the lubricant intermediate storage device 42 or the lubricant supply line 15 on the inlet side and may communicate with the looper bore hole 41 on the outlet side. In addition, a seal (not shown) is required on the outlet side to ensure a leak-free lubrication. The connecting element may have an inner circumferential groove on the outlet side, and the groove extends along the movement trajectory of the looper bore hole 41, so that the connecting element is at each rotational position of the looper 9 and the looper bore hole 41. At each rotational position, it is guaranteed that the looper bore hole 41 communicates. Alternatively, the looper bore hole 41 itself may be opened in the outer wall of the casing of the looper 9 via a circumferential groove so as to ensure communication with the lubricant supply at each rotational position of the looper 9. For this purpose, a circumferential groove design is conceivable in which the connecting elements described above can also be omitted.

  With reference to FIG. 5, another advantageous embodiment of the lubricant supply device 2 will be described. Similarly designed components are indicated by the same reference numerals used in FIGS.

  In contrast to the embodiment described above, the upper and lower pump units 13, 14 are provided with a control unit 25. Alternatively, each pump unit 13, 14 can be provided with its own control unit 25. When two or more pump units are provided, each control unit can also be provided.

  The control unit 25 operates the pump units 13, 14 in a controlled manner. When controlling the pump units 13, 14, an initial value is defined. The initial value is processed by the control unit 25 and transmitted to the actuator 18 of the pump units 13 and 14. Therefore, the lubricant is supplied to the lubrication points 8 and 10 in a controlled manner. It is conceivable to use various initial values (for example time or number of stitches) for controlling the pump units 13,14.

  Lubricant 16 may be periodically supplied to lubricant buffering and dispensing element 24 when performing time control. For example, the pump units 13 and 14 may be switched on for a predetermined time (for example, 2 seconds) and the lubricant 16 may be supplied every 45 hours. For this purpose, the control unit 25 may comprise a timer unit (not shown).

  As an alternative, the operating time of the drive element is another suitable parameter used as an initial value. For example, the pump units 13, 14 may be switched on for 2 seconds every operating time. The operating time of the drive element can be determined by the control electronics 11 of the sewing machine 1. When a predetermined operating time is reached, the control electronics system 11 issues a signal to the control unit 25, which then switches on the pump units 13,14. The lubricant 16 is then supplied from the lubricant container 12 to the lubricant buffer and distribution element 24. At the end of the predetermined 2 seconds, the pump units 13, 14 are switched off and the supply of the lubricant 16 to the lubricant buffer and distribution element 24 is interrupted.

  Regardless of the initial value selected, the pump unit 13 can be driven by the control unit 25 independently of the pump unit 14.

  Alternatively, the stitch number is another suitable parameter used as an initial value for controlling the pump units 13,14. In this case, the pump units 13, 14 are switched on for a predetermined time after a predetermined number of stitches. The number of stitches is an important operating parameter that can be determined by the control electronics system 11. The looper speed is a linear function of the number of stitches. Thus, both pump units 13, 14 are controlled as a function of the number of stitches and ensure a supply as a function of the consumption of lubricant 16.

  Controlled lubricant supply is described in more detail with reference to FIG. Similarly designed components are indicated by the same reference numbers used in FIGS.

  In contrast to the exemplary embodiment described above, a sensor 26 associated with the lubrication points 8, 10 and in signal connection with the control unit 25 is provided. A signal connection between the control unit 25 and the control electronics 11 is not necessary. Sensor 26 allows the most different operating parameters to be detected. Advantageously, these sensors are configured as temperature sensors that detect the temperature at the lubrication points 8, 10. When a predetermined desired temperature, for example 60 ° C., is exceeded, the pump unit 13 is switched on and operated until the temperature is again below the desired temperature.

  The design and function of the pump unit will be described in more detail with reference to FIG. Similarly designed components are indicated by the same reference numbers used in FIGS.

  The pump unit includes an integrally designed pump casing 17, and an actuator 18 operatively connected to the piston 20 via a piston rod 19 is disposed in the pump casing 17. The piston 20 is guided in a sealed state along the pump casing 17. The actuator 18 generates a reciprocating vertical movement of the reciprocating piston 20. While moving upward, the piston is moved from the lower position to the upper position, creating a negative pressure that draws the lubricant from the lubricant container into the pump chamber 27. The downward movement creates an overpressure that causes lubricant to be supplied from the pump chamber to the lubricant buffer and distribution element 24. The check valve 23 recirculates lubricant from the lubricant buffering and dispensing element 24 to the lubricant container 12 and ensures one-way lubricant supply when the pump units 13, 14 are not in operation. To do. The actuator 18 is configured as an electromechanical actuator, in particular an electromagnet or a piezoelectric actuator. In order to ensure the leak-free operation of the pump units 13, 14, the piston 20 needs to be guided in a sealed manner along one of the walls of the pump casing 17. Advantageously, this end is provided with a mating seal. Alternatively, an annular seal, a lip seal or a diaphragm seal may be provided.

  Another advantageous embodiment of the pump unit is described in more detail in FIG. Similarly designed components are indicated by the same reference numerals used in FIGS.

  In contrast to the exemplary embodiment according to FIG. 7, the pump unit is configured as an annular gap pump. In this embodiment, the piston 20 is provided with an annular gap that defines a pump chamber 27 together with the pump casing 17. The lubricant discharge opening 22 is disposed so as to be vertically offset with respect to the lubricant inlet opening 21. A ventilation bore hole 28 is provided below the piston 20 to ensure pressure compensation. Advantageously, a lubricant transfer element 29 is provided at the piston end of the lubricant discharge opening 22. Thereby, supply of the lubricant 16 from the pump chamber 27 to the lubricant supply line 15 is improved.

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Lubricant supply apparatus 3 Base plate 4 Stand 5 Arm 6 Head 7 Needle bar 8, 10 Lubrication point 9 Looper 11 Control electronic system 12 Lubricant container 13 1st pump unit 14 2nd pump unit 15 Lubricant supply line 16 Lubrication Agent 17 Pump casing 18 Actuator 19 Piston rod 20 Piston 21 Lubricant inlet opening 22 Lubricant discharge opening 23 Check valve 24 Distributing element 25 Control unit 26 Sensor 27 Pump chamber 28 Ventilation borehole 29 Lubricant transfer element 30 Looper casing 31 Looper casing bore hole 32 Oil washer 33 Looper shaft 34 Oil washer bore hole 35 Container 36 Looper shaft 37 Inclined looper bore hole 38 Looper truck 39 Bobbin casing 40 Deep groove ball Receiving 41 looper borehole 42 lubricant intermediate storage device

Claims (11)

A lubricant supply device (2) for the sewing machine (1),
-At least one lubricant container (12) for storing lubricant (16);
At least one lubricant supply line (15) for supplying the lubricant (16) from a lubricant container (12) to at least one lubrication point (8, 10) of the sewing machine (1);
A lubricant supply device comprising at least one pump unit (13, 14) for supplying the lubricant,
The at least one pump unit (13, 14) is coupled to at least one lubricant supply line (15);
Lubrication with said at least one lubricant supply line (15) having a lubricant buffering and dispensing element (24) for buffering and dispensing said lubricant at the end close to said lubrication point (8, 10) Agent supply device.   Lubricant supply device according to claim 1, characterized in that the at least one pump unit (13, 14) is configured as a micropump.   The lubricant supply device according to claim 1 or 2, wherein a control unit (25) for controlling the pump unit (13, 14) is associated with the pump unit (13, 14).   4. Lubricant supply device according to claim 3, characterized in that the control unit (25) is in signal connection with at least one sensor (26) for detecting operating parameters of the sewing machine.   5. Lubricant supply device according to any one of the preceding claims, characterized in that the lubricant buffer and distribution element (24) is configured in the form of felt pieces and / or wicks. A method of lubricating a lubricating point of a sewing machine,
Comprising the lubricant supply device (2) according to any one of claims 1 to 5,
Providing a lubricant (16) for lubricating the lubrication points (8, 10) in the sewing machine (1).   Method according to claim 6, characterized in that the pump unit (13, 14) is time controlled.   8. A method according to claim 7, characterized in that the lubricant (16) is periodically supplied by a pump unit (13, 14) which allows the lubricant (16) to be supplied at predetermined time intervals.   Method according to claim 6, characterized in that the pump unit (13, 14) supplies according to the consumption of the lubricant (16).   The at least one sensor (26) detects at least one operating parameter of the sewing machine (1) and controls the pump unit as a function of the detected operating parameter value. the method of.   A sewing machine comprising the lubricant supply device according to any one of claims 1 to 5.

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