JP2010022819A - Actuation device for operating sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an actuation device improved so that the actuation force of an actuating element is adjusted as easily as possible. <P>SOLUTION: A sewing machine has the actuation device, especially a foot pedal device for actuating the sewing machine. The foot pedal device 8 has an actuating element 13, especially a foot pedal. A pre-loading device of the actuation device has an actuating element pre-loading body 20, especially a pedal pre-loading body 20. The pre-loading body 20 is joint-connected to the foot pedal 13, a housing body, and pre-loading springs 23, 24 to pre-load relative movement of the drive pre-loading body 20 to the housing body 21, based on a movement of the actuating element 13. Pre-load force of the pre-loading spring 23 is adjusted by using an adjusting device 29. The actuation device uses such a mechanism that the actuation force of the actuating element can easily be adjusted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The invention relates to a drive device for operating a sewing machine according to the preamble part (so-called part) of claim 1. The invention further relates to a preloading (preloading, preloading, preloading) device for a sewing machine driving element and a sewing machine comprising this type of driving device.

  A sewing machine equipped with a drive device of the type described at the beginning is disclosed in US Pat. Sewing machines are used all over the world. As a result, there are various preferences that vary from user to user in terms of driving force, eg pedal force.

DE1928138A

  The object of the present invention is therefore to provide a drive device of the type mentioned at the outset which is improved so that the drive force of the drive element can be adjusted as easily as possible.

  This task is solved by a drive device having the features described in claim 1 according to the invention.

  In accordance with the present invention, it is possible to easily adjust the driving force to meet the individual preferences of each user by using a preload spring with an adjusting device attached to adjust the preload force. Recognized. The user can change the driving force simply by driving the adjusting device. More complicated adjustment means such as a preload spring can be omitted. The preload force is adjustable according to the present invention and is applicable to various drive devices that are physically driven by the user. Examples of this include a foot pedal, a knee lever or a hand lever. The guide rod of the preloading body ensures that the linear movement of the preloading body is guided as defined, thus eliminating the risk of preloading device failure and other types of slow reaction. Reduce.

  Only a few parts and a little effort are required to construct a preloading device according to claim 2.

  The preload adjusting guide wall of the adjusting sleeve according to claim 3 can be implemented in a particularly cost-effective manner. Furthermore, the different number of latching parts corresponds to the number of possible adjustment force settings. When the latching portion is fastened to the counter body, this simply provides tactile feedback to the user that the desired change in driving force has been performed.

  Three latching parts according to claim 4, in other words three different preloading forces, ie three different driving forces, can be set using the adjusting device and have proved to be suitable for most applications in practice. It is also possible to have two or four or more different latching parts and correspondingly adjustable drive power numbers.

  Two adjusting counter bodies according to claim 5 ensure that the guide wall is firmly supported by the counter body. This reduces the requirements in terms of the design structure of the adjustment device.

  The guide wall according to claim 6 is structurally simple.

  The guide wall according to claim 7 ensures that different parts of this guide wall interact with the counter body at a particular time and reduce the wear of the adjusting device. This applies in particular to parabolic guide walls according to claim 8. The guide wall can be curved between the latching sections to ensure an optimized drive of the drive device momentum. As a result, adjusting the preload force requires little power consumption.

  The drive part according to claim 9 ensures that the adjusting device can be driven particularly easily. The drive part may be provided with a mark or scale indicating the selected preload force. The selected preload force can also be obtained from the shape of the drive part.

  The preload spring according to claim 10 can be configured to be particularly cost effective.

  The advantages of the preloading device according to claim 11 and the sewing machine according to claim 12 correspond to the advantages already described above for the drive device according to the invention.

  Embodiments of the present invention will now be described in more detail using the following figures.

FIG. 2 is a view of the sewing machine as seen from the user, with the sewing machine shown in a cutaway view near the housing of the foot pedal device. FIG. 4 is a view of a preloading device for a foot pedal device showing only a portion of the housing body shown in partial cross-section. FIG. 3 is a view of the preloading device from the direction seen from III in FIG. 2, articulating the foot pedal with the preloading device, regardless of scale. FIG. 4 is a view of the preloading device viewed from the opposite direction of FIG. 3, wherein the housing body is shown in partial cross-section to show the interaction of the preload adjustment guide wall with the adjustment counter body of the preloading device. . FIG. 4 is a view of an adjustment sleeve of a preloading device with a drive portion. FIG. 6 is a diagram of one current position of an adjustment sleeve for setting various preload forces for relative movement of the pedal preloading body relative to the housing body, depending on the operation of the foot pedal. FIG. 10 is a view of another current position of the adjustment sleeve for setting various preload forces for relative movement of the pedal preloading body relative to the housing body, depending on the operation of the foot pedal. FIG. 6 is another alternative current position view of the adjustment sleeve for setting various preload forces for relative movement of the pedal preloading body relative to the housing body, depending on the operation of the foot pedal.

  The sewing machine 1 includes a base plate 2 with an arm 3 and an angled arm 4, and the arm 3 extends upward from the base plate 2. This arm 4 terminates at a head 5. The base plate 2, the stand 3, the arm 4, and the head 5 are surrounded by the housing 6 of the sewing machine 1. The housing body 7 of the foot pedal device 8 is attached to the lower side of the housing portion of the base plate 2, and the entire foot pedal device 8 is shown in FIG. The foot pedal device 8 is an example of a drive device for operating the sewing machine 1, and this drive device is physically driven by a user. The foot pedal device 8 will be described in more detail later.

  An arm shaft that is not visible in the drawing is attached to the arm 4 for rotation. This arm shaft drives the needle bar 9 of the head 5 using a crank drive, and this needle bar 9 is attached to the head 5 for axial displacement. The needle bar 9 has a needle 10 at the lower end. The needle 10 is movable up and down along the vertical axis using a crank drive. The needle 10 guides the upper thread into the needle hole. This upper thread (not shown) is supplied by a spool (not shown).

  The base plate 2 supports a support plate 11 on which the fabric can be placed in order to sew the fabric using the sewing machine 1. In the sewing process, the fabric is pressed by the rolling foot 12.

  The foot pedal device 8 has a foot pedal 13, which can be swung around a pivot joint with a horizontal pivot shaft 14, so that it can be moved to various functional pedal positions. is there. The foot pedal 13 is driven by the user's foot 15. The foot pedal 13 is an example of a drive element that can be physically driven by a user. Other drive elements of this type are knee levers or hand levers and may be part of the drive device.

  At the toe end of the foot, the foot pedal 13 is articulated with the connecting lever 17 via a pivot joint having a horizontal pivot 16. The end of the connecting lever 17 on the opposite side of the pivot joint with the pivot 16 is articulated with the hook 19 of the pedal preloading body 20 via another pivot joint. The pedal preloading body 20 is an example of a drive element preloading body. The pedal preloading body 20 is guided by the housing body 21 for upward displacement. The housing body 21 has two housing halves 22, of which only one housing half 22 is shown in FIGS. 2 to 4 and FIGS. 6 to 8. The two housing bodies 7, 21 are part of the housing of the foot pedal device 8.

  Since the upward movement of the pedal preloading body 20 of the housing body 21, in other words, the relative movement depending on the movement of the foot pedal 13, is preloaded using the two preload springs 23 and 24, this upward movement is defined respectively. Conflict by the amount of resistance preloaded. The lower preload spring 23 in FIG. 3 functions to generate a preloaded resistance against the pedal pressure, in other words, the relative downward movement of the pedal preloading body 20 in FIG. Correspondingly, the upper preloading force 24 according to FIG. 3 generates a resistance to the pedal up stroke, in other words the relative upward movement of the pedal preloading body 20 of FIG.

  The upper preload spring 24 is supported with respect to the collar 25, and this collar 25 is connected to the guide rod 26 of the pedal preloading body 20 so as to be displaceable in the axial direction. The guide rod 26 is similarly guided by the axial displacement of the receptacle 27 of the housing body 21. At the opposite end, a preload spring 24 is supported against the housing body 21.

  The preload springs 23 and 24 are coil springs wound around the guide rod 26.

  In the upward direction, the lower preload spring 23 of FIG. 3 is supported with respect to the other collar 28 of FIG. 3, which is also connected to the guide rod 26 so as to be axially displaceable. Yes. In the descending direction according to FIG. 3, the preload spring 23 is supported against an adjusting device 29 which is an adjusting sleeve. The adjustment sleeve 29 surrounds the guide rod 26 and is rotatable, at least pivotable, about the longitudinal axis of the guide rod 26.

  The adjustment sleeve 29 has a preload adjustment guide wall 31. The preload adjusting guide wall 31 has a total of three pairs of latching portions 32 to 34, and the guide walls 31 form an angle of about 90 ° with each of the latching portions 32 to 34. The adjacent portions of the latching portions 32 to 34 are offset from each other by 45 ° around the longitudinal axis 30 when viewed from the circumferential direction. The two latching portions 32 to 34 forming a pair are at the same axial level with respect to the longitudinal axis 30 and are offset from each other by 180 ° around the longitudinal axis 30 when viewed from the circumferential direction. Therefore, the guide wall 31 has two-fold rotational symmetry. The latching portion 32 (see FIG. 3) is in the lowest axial position with respect to the hook 19. The latching portion 34 (see FIG. 8) is in the uppermost axial position with respect to the hook 19, in other words, the latching portion 34 is disposed farthest from the hook 19. The latching portion 33 is offset between the latching portion 32 and the latching portion 34 in the axial direction. Between the latching portions 32-34, the guide wall 31 is linear or nearly linear, which can be achieved using a linear portion of the curve with optimized momentum. The curve of the guide wall 31 between the latching parts 32 to 34, in particular a parabolic shape, can be considered as well.

  In order to adjust the preload force of the preload spring 23, the guide wall 31 interacts with two adjustment counter bodies 35, which are respectively integral with the housing half 22 of the housing body 21. (See FIG. 4 showing one of the two adjustment counter bodies). The two adjustment counter bodies 35 are arranged at the same axial level so as to be displaced from each other by 180 ° around the longitudinal axis 30 of the guide rod 26 when viewed from the circumferential direction.

  The latching portions 32-34 define the latching portion of the adjustment counter body 35 at various axial portions of the adjustment sleeve 29 relative to the guide rod 26. This provides the three possible preload adjustment positions shown in FIGS. FIG. 6 shows the position of the adjustment sleeve 29 corresponding to the uppermost spring preload of the preload spring 23. In this position, the latching portion 32 interacts with the adjustment counter body 35. FIG. 7 shows the latching position where the latching portion 33 interacts with the adjustment counter body 35. This current position corresponds to the intermediate preload of the preload spring 23. FIG. 8 shows the current position where the latching portion 34 interacts with the adjustment counter body 35. This corresponds to the lowest preload force of the preload spring 23.

  The adjustment sleeve 29 is connected to a pivotable drive part 36 that is freely accessible from the outside. The swivelable drive portion 36 has a substantially square cross section with side walls 37 that are rounded and slightly convex when viewed from the direction of the longitudinal axis 30. This shape of the drive part 36 allows the latching position according to FIG. 7 to be distinguished visually and tactilely from the latching position according to FIGS. The drive part 36 may typically be formed such that all three latching positions according to FIGS. 6-8 are distinguishable from one another.

  Arranging the pivotable drive part 36 on the outside of the housing body 21 in particular ensures that the dirt sensing component of the drive device 8 can be arranged inside the housing body 21 and is surrounded against the outside.

  In order to adjust the preload of the pedal force for driving the foot pedal 13 using pressure, the user uses the drive portion 36 to select the preload force that is most convenient.

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Base plate 3 Arm stand 4 Angled arm 5 Head 6 Housing 7 Housing body 8 Foot pedal device, drive device 9 Needle bar 10 Needle 11 Support plate 12 Rolling foot 13 Foot pedal 14 Rotating shaft 15 Foot 16 Rotating shaft 17 Connecting lever 19 Hook 20 Pedal preloading body 21 Housing body 22 Housing half part 23 Lower preload spring 24 Upper preload spring 25 Collar 26 Guide rod 27 Receptacle 28 Collar 29 Adjustment sleeve 30 Vertical axis 31 Guide wall 32 to 34 Latching part 35 Adjustment counter Body 36 Rotating drive part 37 Side wall

Claims (12)

A drive element (13);
A preloading device;
A drive device (8) for operating the sewing machine (1), comprising an adjustment device (29) for adjusting the preload force of the preload spring (23) of the preloading device;
The preloading device is
A drive element preloading body (20) articulated with the drive element (13);
A housing body (7, 21);
At least one preload spring (23, 24) for preloading the relative movement of the drive element preloading body (20) with respect to the housing body (7, 21), the relative movement being the movement of the drive element (13) Depends on the
In the drive device (8):
Drive device (8), characterized in that the drive element preloading body (20) comprises a guide rod (26) linearly guided by the receptacle (27) of the housing body (21).   The adjustment device (29) is an adjustment sleeve supported on the one hand by a preload spring (23) and on the other hand by a housing body (21), which surrounds the guide rod (26) and at the same time a preload force. 2. Drive device (8) according to claim 1, characterized in that it can be pivoted or rotated about the longitudinal axis (30) of the guide rod (26) to adjust the angle.   The adjustment sleeve (29) is provided with a preload adjustment guide wall (31) that interacts with the adjustment counter body (35) of the housing body (21), and the circumference of the longitudinal axis (30) of the guide rod (26) is seen in the circumferential direction. A plurality of latching portions (32-34) are formed in the preload adjusting guide wall (31), and these latching portions (32-34) are in different axial directions of the adjusting sleeve (29) relative to the guide rod (26). 3. Drive device (8) according to claim 2, characterized in that the position defines the latching position of the adjustment counter body (35).   4. Drive device (8) according to claim 3, characterized by three latching parts (32-34) of the preload adjusting guide wall (31).   Two adjustment counter bodies (35) are arranged 180 ° apart from each other around the longitudinal axis (30) of the guide rod (26) and the preload adjustment guide wall is folded in half around this longitudinal axis (30) 5. Drive device (8) according to claim 3 or 4, characterized in that it has a rotational symmetry.   Driving device (8) according to any one of claims 3 to 5, characterized in that the guide wall (31) comprises a straight wall portion between the latching portions (32-34).   6. Drive device (8) according to any one of claims 3 to 5, characterized in that the guide wall (31) comprises a curved wall part between the latching parts (32-34).   8. Drive device (8) according to claim 7, characterized in that the guide wall (31) comprises a parabolic wall part between the latching parts (32-34).   9. Drive device (1) according to any one of claims 2 to 8, characterized in that the adjustment sleeve (29) is connected to a pivotable drive part (36) which is freely accessible from the outside. 8).   Features a preload spring that is in the form of a coil spring (23, 24) that surrounds the guide rod (26) and is supported between a collar (28) fixed to the rod (26) and an adjustment sleeve (29). The drive device (8) according to any one of claims 2 to 9.   Preloading device for a sewing machine drive element (13) according to any one of the preceding claims. Sewing machine (1) comprising a drive device (8) according to any one of the preceding claims.

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