EP1840255B1 - Needle holder for a sewing machine - Google Patents

Description

The invention relates to a needle holder for a sewing machine, in particular for an industrial sewing machine. For sewing machines, the sewing needle, needle plate, gripper and needle guard must be accurately positioned with respect to each other to ensure reliable stitching, especially when sewing at high sewing speed and thus high number of stitches. If the adjustment of the position of the gripper with respect to the needle is inadequate, this may result in missed stitches, needle and thread breaks as well as damage to the gripper and needle guard.

Sewing machine needles are selected in particular with regard to their thickness with respect to the sewing material. Accordingly, there is a need to use one and the same sewing machine, different thickness sewing needles.

Sewing machine needles have a groove in the vicinity of their eye, into which the gripper dips when stitching to receive a thread pierced by the sewing material. Different thick sewing needles have different deep grooves. The bottom or bottom of the groove thus has different positions with different thickness sewing machine needles.

This is from the DE 103 34 023 A1 which discloses a system for producing needles of different thicknesses. When using these sewing needles, the gripper position does not have to be matched to the particular needle thickness used. The application of the doctrine of DE 103 34 023 In the case of needles with a large needle diameter in the region of the groove, this leads to a small needle cross section in comparison to the needle cross section in the area of the needle shank. This increases the susceptibility to breakage, especially in needles with a large needle diameter (Nm).

In household sewing machines needles are provided to circumvent the gripper adjustment, which have a flattened piston. The flattening is formed differently with different strength sewing machine needles (needles with different nominal diameter) to ensure that no gripper adjustment is required when different thickness needles are used. In industrial sewing machines, however, needles are generally required with a cylindrical piston. Thus, the needle holder uniformly sets the central axis of all sewing needles.

The adjustment of a gripper to adapt to sewing needles with different thickness is usually a lot of work connected and also requires a trained specialist. In particular, in lockstitch machines with vertically arranged gripper axis readjustment of the gripper and the needle guard is quite expensive, resulting in downtime and high Einrichtaufwand.

The German Patent 872,147 discloses a sewing machine with a needle bar which is mounted vertically displaceable in slide bearings. At its lower end, the needle bar carries a needle holder with a clamping screw for attaching a sewing needle. The plain bearings for displaceable mounting of the needle bar are formed on a guide element, which can be brought by adjusting screws in a desired spatial position, whereby an adjustment of the needle is possible. However, the readjustment of the needle requires expertise and access to the interior of the sewing machine housing.

The German Patent 856,828 as well as the US patent 3,713,407 each discloses a sewing machine with a needle bar, which is provided at its lower end with a blind bore for receiving the piston of a sewing needle. Transverse to the blind bore a threaded bore for receiving a clamping screw is provided. This fixes the position of the sewing needle with respect to the needle bar.

The GB patent 1050003 discloses a sewing machine whose needle bar is mounted in an adjustable guide. For connection between needle bar and sewing needle only a conventional clamping screw is provided. The adjustment of the guide of the needle bar requires access to the interior of the sewing machine and expertise.

From the US 3,763,805 A For example, a needle holder for a sewing machine is known, which receives one or more needles. The needle holder for this purpose comprises a plurality of carriages, wherein the carriages are adjustable in the needle bar longitudinal direction and transversely to the latter. As a result, the needles can alternatively be transferred to an advanced active position and to a retracted passive position. In addition, they can be adjusted laterally. The overall arrangement is voluminous and requires a corresponding space.

On this basis, it is an object of the invention to provide a way to use on sewing machines, especially industrial sewing machines, needles with different needle size, without having to adjust the gripper.

This object is achieved with the needle holder according to claim 1:

The needle holder has a holding device for receiving a sewing needle in order to hold it in a holding position. On the holding device, an adjusting device is provided, with which the holding position of the holding device in a direction transverse to the sewing needle and thus also transversely to the needle bar is adjustable. This can ensure that each different sewing needles are positioned so that the bottom of their groove comes to rest in one and the same relative position with respect to the cooperating with the sewing needle gripper. The adjustment of the needle position is usually much easier than the setting of a gripper position. The needle is freely accessible above the sewing table. The adjustment of the needle position is thus similarly easy to carry out, such as the replacement of the needle.

Due to the transverse adjustment of the needles, this has no defined zero position. It may therefore be necessary to use throat plates with different stitch hole positions. However, a needle plate change is easily feasible even for less experienced employees.

Sewing machines are also known in which the needle is inserted into a bore which is contained in the means for ensuring that the material is being transported. These sewing machines do not contain a taphole plate. The hole is shaped so that an adjustment of the postition due to a needle change is not necessary.

In the case of the needle holder according to the invention, the sewing machine needle can be displaceably arranged relative to the actual needle bar on which the sewing needle is held and which is moved vertically up and down during sewing operation, so that the needle is moved towards and away from the gripper can. The gripper position can remain unchanged.

In a first embodiment, the adjusting device may comprise a clamping device with which the piston of the sewing needle is tensioned against a positionally adjustable abutment means. A position adjustment of the attachment means can be carried out, for example, in stages or steplessly in order to clamp the sewing needle in their respective desired position. The adjusting device has an adjustable element on which the sewing needle rests (then the element forms a contact means) or which holds the sewing needle (then the element forms a holding means). The adjustable element can also be interchangeable in shape Beings be formed. All mentioned alternatives are suitable for the realization of the invention.

Ideally, with stepless position adjustment it is possible to set the optimal needle-gripper distance for any needle size. In many cases, however, only needles are used with a predetermined strength anyway. In such cases, it is sufficient if the needle holder allows adjustment positions for needles of the corresponding needle size. Furthermore, it is possible to limit the adjustment options to steps of, for example, 0.1 mm to 0.2 mm. For example, a mechanical adjustment device may be provided with a locking dimension that is a predetermined size of e.g. 0.2 mm. The needles can be divided into several, for example four, groups. Group 1 can include needles with a diameter of Nm 80, 90, 100. Group 2 includes needles of diameter Nm 110, 120, 130. Group 3 includes needles of Nm 140, 150, 160. Group 4 then includes, for example, needles of Nm 180, 190, 200. A mechanical four-position adjustment device can handle all significant needle sizes Groups 1 to 4 cover, each adjustment is assigned to each of the groups. This takes into account most precision requirements that occur in practice.

In a presently preferred embodiment, the adjusting device is formed by an eccentric adjusting device. This includes, for example, two eccentrics which are rotatably mounted about axes of rotation oriented along the needle bar. In addition, the eccentric adjusting device is preferably combined with a linear guide device which specifies a guide direction oriented transversely to the needle bar. Through the interaction of Exzenterverstelleinrichtung and linear guide device a slim adjustment is created, the outer contour does not project beyond the outer contour of the needle holder. Thus, collisions between the adjustment and other elements of the sewing machine are largely excluded. The adjustment can be easily integrated into existing machine concepts.

It is possible to make the adjustment manually. The corresponding manual adjustment devices are preferably Stufenverstelleinrichtungen. Incorrect settings are thus easily excluded. The operator only has to select the correct detent level or setting level. The adjustment can be done by a switching shaft, raster circuit, series connection or by using appropriate supplements. It is also possible, by means of piezo technology. Piezo drives or servomotors electronically adjust the distance of the sewing needle to the gripper. An electronic control is particularly advantageous because it can be reproducibly obtained by them desired machine settings.

Ideally, each needle thickness is assigned exactly one position of the sewing needle or the adjusting device and thus achieved that the optimum gripper spacing is maintained. In the case of an electronic control a stepless adjustment is advantageous.

Further details of advantageous embodiments of the invention will become apparent from the drawings, the description or claims.

Figur 1

eine Nähmaschine in einer schematisierten, ausschnittsweisen Darstellung,

Figur 1a

eine Nähnadel der Nähmaschine nach Figur 1 in ausschnittsweiser Darstellung und in einem anderen Maßstab,

Figur 2

eine Nadelstange mit Nadelhalter und Rastwelle zur Verstellung der Nadelposition in schematisierter Vertikalschnittdarstellung,

Figur 3

den Nadelhalter nach Figur 2 in einer anderen Vertikalschnittdarstellung, wobei die Schnittfläche in einem 90°-Winkel zu der Schnittfläche gemäß Figur 2 steht,

Figur 4

den Nadelhalter nach Figur 2 und 3 in einer Horizontalschnittdarstellung,

Figur 5

eine abgewandelte Ausführungsform des Nadelhalters für die Nähmaschine nach Figur 1,

Figur 6

den Nadelhalter nach Figur 5 in einer Horizontalschnittdarstellung,

Figur 7

eine weiter abgewandelte Ausführungsform des Nadelhalters für eine Nähmaschine nach Figur 1 in schematisierter Seitenansicht,

Figur 8

den Nadelhalter nach Figur 7 in einer Stirnansicht,

Figur 9

den Nadelhalter nach Figur 7 im Horizontalschnitt,

Figur 10

eine abgewandelte Ausführungsform des Nadelhalters für eine Nähmaschine nach Figur 1,

Figur 11

eine weitere abgewandelte Ausführungsform des Nadelhalters für die Nähmaschine nach Figur 1 in schematisierter Seitenansicht,

Figur 12

eine weitere abgewandelte Ausführungsform des Nadelhalters für die Nähmaschine nach Figur 1 in Perspektivansicht (schräg von unten),

Figur 13

den Nadelhalter nach Figur 12 in schematisierter Seitenansicht,

Figur 14

den Nadelhalter nach Figur 12 in schematisierter Vertikalschnittansicht und

Figur 15

den Nadelhalter nach Figur 12 in schematisierter Ansicht von unten.

In the drawings, embodiments of the invention are illustrated. Show it:

FIG. 1

a sewing machine in a schematized, fragmentary representation,

FIG. 1a

a sewing needle of the sewing machine behind FIG. 1 in a fragmentary representation and on a different scale,

FIG. 2

a needle bar with needle holder and latching shaft for adjusting the needle position in a schematic vertical sectional view,

FIG. 3

after the needle holder FIG. 2 in another vertical sectional view, wherein the cut surface at a 90 ° angle to the cut surface according to FIG. 2 stands,

FIG. 4

after the needle holder FIGS. 2 and 3 in a horizontal section,

FIG. 5

a modified embodiment of the needle holder for the sewing machine according to FIG. 1 .

FIG. 6

after the needle holder FIG. 5 in a horizontal section,

FIG. 7

a further modified embodiment of the needle holder for a sewing machine according to FIG. 1 in a schematic side view,

FIG. 8

after the needle holder FIG. 7 in an end view,

FIG. 9

after the needle holder FIG. 7 in horizontal section,

FIG. 10

a modified embodiment of the needle holder for a sewing machine according to FIG. 1 .

FIG. 11

a further modified embodiment of the needle holder for the sewing machine according to FIG. 1 in a schematic side view,

FIG. 12

a further modified embodiment of the needle holder for the sewing machine according to FIG. 1 in perspective view (diagonally from below),

FIG. 13

after the needle holder FIG. 12 in a schematic side view,

FIG. 14

after the needle holder FIG. 12 in a schematic vertical section view and

FIG. 15

after the needle holder FIG. 12 in a schematic view from below.

In FIG. 1 is a schematic view of a section of a sewing machine 1 based on a needle bar 2 of a sewing machine 1 belonging table 3, a sewing needle 4, a foot 5 and a gripper 6 illustrated. The illustrated gripper 6 is an alternating gripper 6 with a horizontal axis of rotation. The representation of an alternating gripper 6 is chosen by way of example, the same applies to rotating gripper. The sewing needle 4 is attached to the needle bar 2 by means of a needle holder 7. The needle bar 2 is connected to a drive device and, as in FIG. 1 schematically illustrated by an arrow 8, reciprocally driven. It performs a linear movement along the longitudinal direction of the sewing needle 4. In other words, the sewing needle 4 is oriented parallel to the needle bar 2 and its direction of movement. The sewing needle 4 has at its upper end on a cylindrical portion which is referred to as a piston and the attachment of the sewing needle 4 is used. The piston is arranged concentrically with the remaining sewing needle 4, and has a diameter which corresponds to that of the sewing needles 4 used. All sewing needles 4, which are associated with a sewing machine and the needle bar 2, have the same piston diameter regardless of their strength.

The foot 5 has a slot 60 which can be pierced by the sewing needle 4. The substance transport serving, arranged below the foot 5 means are not illustrated. Under the foot 5, a tap hole plate 9 is further arranged, which has an opening 10 to be pierced by the sewing needle 4. Under the taphole plate 9 sit the movably arranged gripper 6, which has a tip 6a, and a needle guard 11, on which the flank of the needle tip can be supported when the needle 4 in the area their lower reversal point moves. This leads to a stabilization of the transverse movement of the sewing needle 4. The transverse movement of the sewing needle 4, which is undesirable in itself, depends on the sewing conditions, the sewing process. Does the sewing needle no transverse movements, or they are equalized by the needle guard 11, this facilitates the gripper 6 to grab the thread. In this case, the gripper 6 enters a provided on the sewing needle 4 groove 12 to take a current through her eye 13 thread.

The sewing needle 4 is in FIG. 1a separately illustrated. The eye 13 is disposed adjacent to its tip 14. A needle groove 15 or yarn channel opens into the eye 13. At the needle groove 15 opposite side, the groove 12 is arranged. The sewing needle 4 and the gripper 6 are moved with respect to each other so that the tip 6a of the gripper 6 engages in the groove 12 while the bottom of the same just not or at most touches with low pressure.

The needle holder 7 allows the storage of different thickness sewing needles with uniform cylindrical pistons and their positioning on the needle bar 2, so that despite different needle thickness, the bottoms of the flutes 12 different thickness needles with respect to the gripper 6 at a uniform position. The needle holder 7 used for this purpose is in FIG. 2 illustrated separately in vertical section. It forms, for example, a cuboid housing, on the upper side of which an extension 61 is provided with a threaded blind bore. The extension 61 can be received by an end-side stepped bore which is formed in the needle bar 2. To connect between needle bar 2 and needle holder 7 is a screw 16th

The needle holder 7 encloses an inner space 17, in which a slider 18 is mounted transversely to the longitudinal direction of the needle bar 2 as well as transversely to the longitudinal direction of the sewing needle 4 adjustable. The adjustment direction is in FIG. 2 indicated by an arrow. The slider 18 forms a bearing device 19 for the sewing needle 4. Like FIG. 3 illustrated, it engages with a web 20 provided on the underside of the needle holder 7 slot 21. At the end of the needle holder 7 protruding out end a blind bore 22 for receiving the piston of the sewing needle 4 is provided. One or more of these blind bore 22 in the transverse direction cutting threaded holes 23 serve to receive clamping screws for locking the sewing needle. 4

The slider 18 is biased by a clamping means, for example in the form of a spring means, in particular in the form of a compression spring 24, in an adjustment direction and pressed against a bearing means 25. This is formed in this embodiment by a latching shaft 26 having two or more, for example four, locking positions, which are defined by flattened side surfaces accordingly. The distances of these side surfaces of a rotation axis 27 are of different sizes. The latching shaft 26 is arranged transversely to the needle bar 2 and the sewing needle 4 and protrudes with one end out of the needle holder 7. As FIG. 4 illustrated, may be arranged at the end of a handle, for example in the form of a thumbwheel 28. The substantially flat side surfaces of the latching shaft 26 are parallel to the axis of rotation 27, which in turn is arranged parallel to a flat side surface 29 of the slider 18.

The compression spring 24 or any other suitable clamping means and the abutment means 25 form an adjusting device 30 for adjusting the transverse position of the slider 18 with respect to the longitudinal axis of the needle bar 2 and thus an adjustment for the sewing needle 4. The adjusting device 30 operates as follows:

It is assumed, for example, that the four substantially planar side surfaces of the approximately rectangular detent shaft 26 are arranged at intervals to the axis of rotation 27, which differ from each other by 0.2 mm. These differences are in FIG. 2 for the sake of illustration, much exaggerated. The needle holder 7 is suitable, for example, for storing and holding sewing needles of diameter Nm 80 to diameter Nm 200. For example, the needles of Nm 80 to Nm 100 in a first group, from Nm 110 to Nm 130 in a second group of Nm 140 to 160 Nm in a third group and from Nm 180 to Nm 200 in a fourth group. The operator now selects a suitable sewing needle from one of the four groups and sets the locking position of the locking shaft 26 accordingly. The position of the latching shaft with respect to the four groups of needles can be done, for example, by means of four markings provided on the outside of the needle holder 2 or on the setting wheel 28. If the setting is made, the sewing needle is clamped in the blind bore 22. If necessary, the throat plate 9 can be adjusted or replaced. A gripper adjustment is not required. It can thus be started after needle replacement and adjustment of the adjustment 30 with the sewing operation.

The FIGS. 5 and 6 illustrate a modified embodiment of the needle holder 7, in which the adjusting device 30 does not require storage device 19. This will be explained below, supplementing the previous description is true, as far as the same reference numerals are used and nothing to the contrary is carried out.

In the interior 17 of the needle holder 7, a rotatably mounted receiving prism 31 is mounted. This has at its periphery three, four or more each of two preferably flat contact surfaces 32, 33 limited recesses, where a guided through a hole in the interior 17 end of the sewing needle 4 plant. The contact surfaces 32, 33 are oriented in an example at right angles to each other. The contact surfaces 32, 33 opposite a threaded bore 34 is arranged in the housing of the needle holder 7, in which a clamping screw 35 is seated. This serves to clamp the shaft or piston of the sewing needle 4 against the abutment means, the prism 31.

The prism 31 is rotatably supported by a shaft 36 in the needle holder 7 about the rotation axis 27, which is oriented transversely to the sewing needle 4, and whose end protrudes from the needle holder 7 out and the setting wheel 28 carries. In addition, the shaft 36 is longitudinally adjustable against the force of a spring 37 or other suitable clamping means. The prism 31 of the shaft 36 or the adjusting wheel 28 may also be associated with a locking device 38 which is formed in the simplest case, as illustrated by a detent pin 39, the different, around the shaft 36 arranged around detent holes 62 are assigned.

The prism 31 has in the present embodiment, four contact surface pairs. In FIG. 6 the shaft of the sewing needle 4 is located on the abutment surfaces 32, 33. Further abutment surface pairs are of the abutment surfaces eg 40, 41 or 42, 43 educated. Here are off FIG. 6 only three contact surface pairs can be seen. The embodiment actually contains 4 of these contact surface pairs. The respective abutment surface pairs define different abutment positions for the shank of the sewing needle 4 by being positioned differently with respect to the axis of rotation 27.

To change the needle thickness, first the clamping screw 35 is released and the sewing needle 4 is removed. Then, the thumbwheel 28 is pulled pulling in the axial direction to bring out the pin 39 from its bore. Once it is free, the setting wheel 28 can be rotated to the desired locking position, which corresponds to the needle size to be used now. If the thumbwheel 28 is released, the spring 37 pushes the shaft 36 back to its original position, wherein the pin 39 moves into a corresponding other bore 62.

In the new locking position now another contact surface pair is arrived at the clamping screw 35 facing point. It is now the sewing needle 4 is inserted with the desired needle size in the space between the respective contact surfaces and the clamping screw 35 and tightened the clamping screw 35. Now the sewing process can be started or continued.

The FIGS. 7 to 9 illustrate another embodiment, which also has more locking positions. With the exception of the special features explained below, the above description of the figures applies correspondingly to the embodiment according to FIGS FIGS. 7 to 9 on the basis of the same reference numbers.

In the interior 17 of the needle holder 7, a latching insert 44 is provided, which has on a side facing the clamping screw 35 side a series of prismatic receptacles 45, 46, 47, 48, 49, 50. These are not exactly identical but are designed so that they define different transverse positions with respect to the needle bar 2 for the sewing machine needle 4 by a desired amount. Incidentally, the slider 44 is formed cylindrically so as to fit into the likewise approximately cylindrical bore of the inner space 17.

At the clamping screw 35 opposite side of the needle holder 7, this is provided with a window 51, which, as FIG. 7 illustrated, a substantially straight edge 52 and on the opposite side has a toothed edge 53. The serrated edge 53 is formed by a series of approximately semi-circular cutouts in which a pin 54 extending away from the rear of the slider 44 lies. This can be done in the direction of the arrow FIG. 8 be pivoted out of a corresponding tooth space, wherein the slider 44 rotates about its longitudinal axis. The pin 54 protruding out of the needle holder 7 can serve as a handle to move the slider 44 into desired axial positions. If a corresponding axial position is selected, a sewing needle 4 can be pushed through the opening 22 into the appropriately selected receptacle 45 to 50 and clamped to the slider 44 by means of the clamping screw 35.

FIG. 10 illustrates a further embodiment of the invention, in which the needle holder 7 on the needle bar 2 by means of a slider 55 is adjustable. This is in contact with a stepped side surface 56 of a recess of the slide 7, which is transversely adjustable on the needle bar 2 is stored. Each step of the side surface 56 is associated with a group of needles. The embodiment according to FIG. 10 shows 4 stages. If a finer adjustment or positioning of the needle 4 with respect to the needle bar 2 is desired, several stages can be provided. For clamping in displacement positions, which he occupies respectively, serve corresponding screws 57, 58, 64. The advantage of this embodiment lies in their slenderness and their low weight. If a stepless adjustment is to be made possible, the side surface 56 can be formed as a wedge surface. The manual setting is then a bit more demanding. For example, it can be made using landmarks.

FIG. 11 illustrates a further embodiment of the invention, to which the previous description with the exception of the features explained below applies.

In or on the needle holder 7, the bearing device 19 is provided which serves to receive the sewing needle. The bearing device 19 is adjustable by means of an electrically actuable actuator 63. This can be formed for example by an electric motor, a piezo drive or the like. By way of a gear mechanism, it effects the desired adjustment of the bearing device 19. For example, the gear may consist of a threaded spindle 58 and a spindle nut 59 driven by the same, which is connected to the bearing device 19. One or more position sensors may be provided to detect the rotational position of the actuator 63 or the linear position of the spindle nut 59. For a remotely controlled, preferably stepless adjustment of the position of the longitudinal axis of the sewing needle 4 with respect to the longitudinal axis of the needle bar 2 is possible.

FIG. 12 illustrates a modified embodiment of an effective between the needle bar 2 and the needle holder 7 adjusting the adjustment of the needle position. In the FIG. 12 illustrated needle bar 2 may also be an adapter 2 which is attached to a needle bar 2 of a sewing machine 1. The adjusting device is formed by a Exzenterverstelleinrichtung 64, which sits at the lower end of the needle bar 2 and is received by a bore 80 of the needle bar 2. Like from the Figures 12 . 13 and particularly FIG. 14 shows, the eccentric 64 has a needle receiving portion 81 with an axially oriented extension 65, whose diameter is substantially smaller than the diameter of the needle bar 2 and its bore 80. The needle bar or the adapter 2 has at its lower end a slot 69 in which a guide portion 66 of the needle receiving part 81 is slidably held. The guide section 66 has two mutually parallel planar flanks 67, 68. The guide portion 66 is overlapped by a slot 69 of the needle bar 2 with little play. The slot 69 thus forms together with the guide portion 66 a linear guide device 70, which is designed as a transverse guide, that defines a transversely oriented to the longitudinal direction of the needle bar 2 guide direction. The longitudinal direction coincides with the direction of movement of the needle bar 2 and is in FIG. 14 marked by an arrow 71.

The needle bar 2 has an inner space 80 which is bounded by a cylindrical wall 72. The interior or the bore 80 is arranged eccentrically (not shown) to the longitudinal axis of the needle bar 2. The wall 72 thus has at its periphery a continuously changing thickness or thickness. The extension 65 extends in the Interior 80 into it. On the extension 65 sits an eccentric 73, which has a cylindrical eccentric bore. The eccentric 73 is rotatably mounted on the extension 65 with little play. The central axis of its cylindrical outer jacket is oriented parallel to the central axis of the extension 65. This is especially true FIG. 15 out.

As FIG. 14 shows, sitting on the eccentric 73, a further outer eccentric 74. This has a cylindrical bore which sits on the cylindrical shell of the first eccentric 73 with little play and against this rotatable. The eccentric 74 has a cylindrical outer shell, which is arranged eccentrically to its central through hole. The second eccentric 74 rests with its outer cylindrical surface on the wall 72 of the needle bar 2 with little play.

The second eccentric 74 is provided with a radial bore 75 into which an adjusting means can be inserted or into which FIG. 12 shows that a pin 76 can be permanently inserted. This protrudes through an attached in the needle bar 2, extending in the circumferential direction slot 77 which extends by a predetermined angular amount, for example 130 ° or 180 °, in the circumferential direction.

The eccentric adjusting device 64 is captively secured to the needle bar 2 in the axial direction. For this purpose, a holding means may serve, for example in the form of a ring 78, which sits on the extension 65. The bore 80 of the needle bar 2 has at its end 83 a step in the form of an inwardly directed shoulder 79. Both eccentrics of the inner eccentric 73 and the outer eccentric 74 are rotatably on the shoulder 79 at. The eccentric 73 is between the shoulder 79 and the holding means 78 captive taut, in which the holding means 78 with a clamping device, such as a screw, is attached to the extension 65. As a result, the needle receiving part 81 is held captive on the needle bar 2. Access to the tensioning device is through the bore 80. The outer eccentric 74 is axially held in place by the pin 76.

The Exzenterverstelleinrichtung described so far 64 operates as follows:

An adjustment of the needle holder 7 and the needle receiving part 81 with respect to the needle bar 2 can be done only in the direction determined by the linear guide device 70 guide direction. To adjust the outer eccentric 74 is rotated by acting on the pin 76 about the longitudinal axis of the needle bar 2. The rotation of the eccentric 74 inevitably has a (eg opposite direction) rotation of the eccentric 73 result. Because of the linear guide 70, the axis of rotation of the eccentric 74 can only move on a linear path. The axis of rotation coincides with the central axis of its outer circumferential surface. On the other hand, the inner eccentric 73 can only rotate about the extension 65. Here, the axis of rotation coincides with the axis of symmetry of its inner circumferential surface, ie its bore wall together. Accordingly, the axis of the eccentric bore of the outer eccentric 74 describes an arcuate path. The path of the lateral surface of the inner eccentric 73 describes the same path, which forces an example of opposite rotation of the two eccentric 73, 74. The rotation of the outer eccentric 74 leads to a deflection movement of the inner eccentric 73 in the form of a corresponding rotational movement. The superposition of the two rotational movements of the two eccentrics 73, 74 results in the total movement forced by the guide device 70.

After the adjustment of the needle holder 7, the newly set position by a locking means (not shown) is secured. This detection means may e.g. be executed in the form of a known screw. For this purpose, the lower end 83 of the needle bar 2 and the adapter 2 has a threaded bore. For fixing the needle holding part 81, the locking means is inserted into the thread, wherein the end of the screw presses with its end on a flank 67 or 68 and thus clamps the guide portion 66 of the needle holding part 7. As a result, the newly set position of the needle holder 7 is determined by a frictional connection.

The needle holder 7 according to the invention is provided in particular for industrial sewing machines, in which sewing machine needles with different needle thickness and preferably cylindrical piston or shaft are mounted and held adjustably in the transverse direction. Thus, a vote of the relative position between sewing needle 4 and the bottom of the groove 12 of the sewing needle 4 and the gripper 6 are made without having to adjust the gripper position and / or the needle protection position.

LIST OF REFERENCE NUMBERS

1

sewing machine

2

needle bar

3

table

4

sewing needle

5

foot

6

grab

6a

hook tip

7

needle holder

8th

arrow

9

Needle plate

10

opening

11

needle guard

12

fillet

13

eyelet

14

top

15

Needle trough, thread trough

16

screw

17

inner space

18

sliders

19

Storage facility

20

web

21

slot

22

Blind hole, opening

23

threaded hole

24

compression spring

25

investment funds

26

Rest wave

27

axis of rotation

28

thumbwheel

29

side surface

30

adjustment

31

Prism, investment funds

32, 33

contact surfaces

34

threaded hole

35

clamping screw

36

wave

37

feather

38

locking device

39

pen

40, 41, 42, 43

contact surfaces

44

pusher

45, 46, 47, 48, 49, 50

Recordings

51

window

52

edge

53

edge

54

spigot

55

pusher

56

side surface

57, 58, 64

screw

58

screw

59

spindle nut

60

slot

61

extension

62

catch hole

63

actuator

64

eccentric adjustment

65

extension

66

guide section

67

flank

68

flank

69

slot

70

Linear guide device

71

longitudinal direction

72

wall

73

eccentric

74

eccentric

75

radial bore

76

pen

77

slot

78

ring

79

shoulder

80

drilling

81

Needle receiving part

83

The End

Claims (15)

1. Needle holder (7) for a sewing machine (1), in particular for an industrial sewing machine (1),
   wherein the needle holder (7) is fitted to receive a sewing needle (4) in order to hold this in a holding position on a needle bar (2),
   with an adjusting means (30, 64) provided on the needle holder (7) for adjustment of the holding position of the needle holder (7) in a direction transverse to the longitudinal direction of the sewing needle (4),
   wherein the adjusting means is a cam adjusting means (64) with a first cam (73), which is disposed to be rotatable around an axis (71) oriented longitudinally to the needle bar (2).
2. Needle holder according to claim 1, characterised in that the adjusting means (30) is fitted for adjustment of the relative position of the sewing needle (4) in relation to a needle guard (11) and/or a shuttle (6), which belongs to the sewing machine (1) and serves to grip the thread guided by the sewing needle (4).
3. Needle holder according to claim 1, characterised in that the adjusting means (30) comprises a position-adjustable abutment element (31) and a clamping means (35) to clamp the sewing needle (4) against the abutment element (31).
4. Needle holder according to claim 1, characterised in that it has a bearing means (19), which is adjustably held transversely to the sewing needle (4) and is fitted to hold the sewing needle (4).
5. Needle holder according to claim 1, characterised in that the adjusting means (30) is configured to define a plurality of needle holding positions, in which the sewing needle (4) is respectively held parallel to a direction of needle movement (8) defined by the sewing movement of the sewing needle (4).
6. Needle holder according to claim 1, characterised in that the adjusting means (30) is configured for manual adjustment.
7. Needle holder according to claim 1, characterised in that the adjusting means (30) is fitted for a stepwise position adjustment.
8. Needle holder according to claim 1, characterised in that the adjusting means (30) is fitted for an infinite position adjustment.
9. Needle holder according to claim 1, characterised in that the cam adjusting means (64) includes a second cam (74), which is rotatably disposed.
10. Needle holder according to claim 9, characterised in that the first cam (73) and the second cam (74) are automatically coupled in the sense of a rotation in the same or contrary direction.
11. Needle holder according to claim 1, 9 or 10, characterised in that a guide means (70) is arranged between the needle bar (2) and the needle holder (7).
12. Needle holder according to claim 11, characterised in that the guide means (70) is a linear guide with a guide direction oriented transversely to the longitudinal direction (71) of the needle bar (2).
13. Needle holder according to claim 11, characterised in that the needle bar (2) has a slot (69) and the needle holder (7) has a needle receiving part (81) with a guide section (66), wherein the guide section (66) and the slot (69) form the guide means (70).
14. Needle holder according to claim 1, characterised in that the adjusting means (30) has an adjusting drive (28, 63).
15. Needle holder according to claim 14, characterised in that the adjusting drive (63) is an electrically controllable and/or adjustable drive.

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