CN109023753B

CN109023753B - Shuttle embroidery machine

Info

Publication number: CN109023753B
Application number: CN201810987256.4A
Authority: CN
Inventors: 法兰兹·拉瑟; 汉诺·努斯堡摩
Original assignee: Laesser AG
Current assignee: Laesser AG
Priority date: 2013-08-28
Filing date: 2014-08-28
Publication date: 2021-07-16
Anticipated expiration: 2034-08-28
Also published as: CN105593425A; EP3039178B1; CN105593425B; WO2015027349A1; TW201900974A; CH708496A1; EP3409821A1; EP3039178B2; EP3039178A1; TWI693322B; CN109023753A; TWI637090B; TW201520395A

Abstract

A shuttle embroidery machine in which a drive beam of the shuttle embroidery machine is moved up and down on a movement path inclined to a vertical line by a crank linkage (5, 7, 25, 31 and 33). The linear motion path is achieved without linear guide members, preferably by linkages that snap onto the drive beam.

Description

Shuttle embroidery machine

Technical Field

The invention relates to a shuttle embroidery machine.

Background

Shuttle embroidery machines have been known for over a hundred years and operate according to a double thread system, i.e. one needle thread and one shuttle thread, wherein the needle thread is wound by the shuttle thread for each stitch. The front needle with small hole conveys the needle thread through the sewing material to the back of the sewing material, and the needle thread forms a loop in the process of withdrawing the sewing needle. A shuttle containing the shuttle line is then threaded through the ferrule. The shuttle embroidery machine includes a large number of stitches arranged in a row and a corresponding number of stitches and shuttles. A drive beam is provided which moves the shuttle up and down in a slightly vertically inclined position.

EP 1595990 discloses such a shuttle embroidery machine having a drive beam which is vibrated by a crank mechanism. The shuttle is guided through the previously formed needle thread loop and back by means of the drive beam which extends over the entire width of the machine, with two drive staples being assigned to each needle. The crank structure of the driving beam can generate 600 needles per minute and more than 600 needles per minute.

To reduce the cost of embroidery, the customer side requires machines that can achieve a greater number of needles. The transmission of EP 1595990 achieves this but has the disadvantage that the wear of many elements of the transmission is high. The upper driving nail and the lower driving nail enable the shuttle to pass through the loop of the needle thread through the driving beam, and because of the existence of larger acceleration on the upper reversal point and the lower reversal point of the driving beam, the bearing point in the crank linkage is greatly stressed, so the service life of the crank linkage is shortened due to abrasion. The following situations may thus arise: the balls in the linear guide of the drive beam guide cannot perform a movement in a rolling manner, but rather slide in the guide path, causing locally too high losses. In particular the bearing bores and the axes on the connecting rods for the drive beams to slide back and forth on their paths inclined to the vertical, the force levels reach a limit.

CH 703090 discloses a drive beam transmission for preventing a pushing movement between a link and a drive beam. This solution provides that the two ends of the link are provided with bendable elements so that lateral movements are not absorbed by sliding on a shaft located on the drive beam, but by elastic deformation of the link. In this prior art, no displacement movement is carried out, but the bending force caused by the spring element on the link must be overcome twice in each lift. This is only possible if the lifting gear has a greater transmission power. In addition, at a lift number of more than 600 per minute, the elastic machine elements cause the drive beam to vibrate, in addition to the vibrations which would otherwise occur in the shuttle embroidery machine. In this case, in addition to the drive beam, the shuttle path and the shuttles transported by the path are also vibrated. The sliding movement prevented by these elastic elements and the wear of the elements which are no longer required here are thus transferred to wear on the shuttle path and to the linear guide elements arranged obliquely to the vertical relative to the drive beam and to the inherently harmful vibrations of the shuttle embroidery machine caused by the spring-elastic elements on the link rods.

Disclosure of Invention

An object of the present invention is to provide a shuttle embroidery machine in which the transmission members for the drive beam can increase the number of needles per minute beyond the range of the number of needles per minute that has been achieved so far, and in which the transmission members are worn to a much lesser extent than the transmission members disclosed so far.

Another object of the invention is to reduce the noise generation of the actuator for the drive beam in case of an increased number of needles, in particular to reduce the vibrations generated.

Another object of the invention is to eliminate the shifting movements in the transmission members and on the drive beam and to replace the linear guide members with corresponding elements.

Another object of the present invention is to improve the shuttle embroidery machine or the actuator for the driving beam so that it can be applied to an embroidery machine having several shuttle paths which are inclined clockwise to the vertical as well as counterclockwise.

The solution of the present invention to achieve the above object is a shuttle embroidery machine. Advantageous solutions to the above object are given by the dependent claims.

The shuttle embroidery machine according to the invention comprises a drive beam with drive pins fixed thereon for the joint movement of a plurality of shuttles along a shuttle path which is inclined to the vertical, and a drive for driving the drive beam substantially parallel to the shuttle path, wherein the lifting drive of the drive beam is achieved by means of a linkage which is formed by a multi-joint assembly.

According to an advantageous design of the invention, the drive beam is not supported in a linear running guide assembly for linear travel.

In accordance with a further advantageous embodiment of the invention, a plurality of articulated elements carry the drive beam in an oscillating manner and drive it, and the drive beam is pivoted to the articulated elements and guided by them in a movement path extending at an angle to the vertical.

According to a further aspect of the invention, the articulated assembly comprises a plurality of rocker arms connected to each other, the rocker arms being pivoted to a common linkage and being positioned so as to pivot with respect to the drive beam in an approximately linear movement with a predetermined inclination with respect to the vertical or horizontal.

According to another design of the present invention, each of the multi-joint components pivotally connected to the linkage comprises a four-joint having three swing arms, wherein the second and third swing arms are pivotally connected to the frame, the first swing arm is pivotally connected to the other two swing arms, and the free end of the connecting rod of the linkage is engaged with the first swing arm in a joint manner.

According to another design of the present invention, the connecting rod is pivotally connected to the first swing arm and the linkage.

According to a further embodiment of the invention, the pivot connection between the connecting rod and the first rocker arm is formed on the first rocker arm.

According to a further embodiment of the invention, the connecting rods are each connected to the crank and the first rocker arm by a joint, which comprises two bearing bolts arranged perpendicular to one another.

According to another design of the present invention, the first swing arm is pivotally connected to a fixing member, and the connecting rod is pivotally connected to the fixing member, wherein the fixing member is fixed to the driving beam.

According to a further embodiment of the invention, the linkage is connected to a two-armed lever (Wippe) which can be driven by a spindle which drives all the linkages.

According to a further embodiment of the invention, the means engaging the drive beam guide the drive beam on a linear path of movement which extends at an angle + α to- α to the vertical.

The shuttle embroidery machine according to the invention comprises a drive device and a guide device for a drive beam with drive pins for driving a plurality of shuttles, which shuttles can be guided to and fro laterally along a shuttle path inclined to a vertical line between two end positions, and a linkage which can be driven for driving the drive-and guide device in an oscillating manner, wherein the guide device comprises a "pivoting lever" which can be driven by the linkage and whose free end is connected to the drive beam and guides the drive beam substantially up and down, wherein:

the guiding device is arranged on a carrier or directly arranged on a frame of the embroidery machine,

the guiding device at least comprises a first rocker arm, a second rocker arm and a third rocker arm,

at least one pivot bearing is formed on each rocker arm to be pivotally connected to each of the other two rocker arms or the carrier,

two pivot axes B and C are formed on the carrier to pivotally support the first ends of the second and third swing arms,

the second ends of the second and third rocker arms are pivotally connected to the first rocker arm on axes E and a,

in addition to the two pivot bearings E, A, a further pivot axis D is formed on the first rocker arm, which is provided on the drive beam,

one end of a connecting rod is pivoted on the linkage device, the other end is pivoted on the driving beam,

the crank arm is arranged in a drivable manner on the drive shaft.

According to an advantageous design of the invention, the two ends of the connecting rod each comprise a cross joint, wherein the first cross joint is pivoted to the crank arm and the second cross joint is pivoted to the shaft D on the drive beam.

According to an advantageous embodiment of the invention, at least two drive and guide devices are fitted on the drive beam at a distance from one another.

The crank mechanism according to the invention allows a large number of needles to be achieved without the drive beam having to be moved in a manner inclined to the vertical by means of linear guide members embodied as guide rods or guide rails. The linear movement of the drive beam is achieved by a four-bar mechanism of corresponding construction, which is driven by a crank mechanism. The displacement motion is replaced by a rotary motion, which is known to produce less noise and which produces much less acceleration and deceleration forces at the point of reversal of the oblique movement of the drive beam. Therefore, the stress degree of the bearing can be greatly reduced, and the rolling bodies in the bearing path can be prevented from sliding.

Another advantage of the invention is that the actuator can be used with shuttle paths having angles arranged mirror-like to the vertical without the need to replace machine elements.

Drawings

Fig. 1 is a perspective view of a known transmission for a drive device as disclosed in EP 1595990;

FIG. 2 is a perspective view of another known actuator device with elastic links for an actuator device as disclosed in CH 703090;

FIG. 3 is a view of the transmission along the drive shaft for the transmission with the drive beam at the lowest position;

FIG. 4 is a side view of the transmission at a right angle to the drive beam;

FIG. 5 is a perspective view of the transmission;

FIG. 6 is a view of the transmission along the drive shaft for the transmission with the drive beam at the uppermost position;

FIG. 7 is a side view of the transmission at a right angle to the drive beam; and

FIG. 8 is a schematic illustration of three guide bar components for a right angled shuttle path and (shown in broken lines) for a left angled shuttle path.

Description of the reference numerals

1: transmission and guide device, guide and transmission device, transmission device

3: bearing point, drive shaft

5: crank arm

5': driven side end

7: link rod

7': drive side end

7": upper end of

9: first joint

11: crank pin

13: link pin

15: driving beam

17: the second cross joint and the second joint

19: axle journal

21: fastening element

23: support socket

25: a first rocker arm and a first lever

27: carrying frame

28: base plate

29: rocker pin

31: second rocker arm

33: third rocker arm

A: axial line

B: axial line

C: axial line

D: axis of rotation, axis

E: axial line

H: horizontal direction, extent, movement, horizontal movement

P: arrow, vertical movement, lifting movement

α: angle of rotation

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

The prior art shown in fig. 1 is EP 1595990, the elements and the working principle of which are explained in detail in the description relating to fig. 4 of EP 1595990. According to such an embodiment of the drive for the drive beam, the drive beam is supported on guide rods in a movable manner on guides inclined to the vertical. The angle of inclination relative to the vertical is preferably 15 °. The lifting gear, which drives the beam and has a crank linkage consisting of a crank and a link rod, moves precisely vertically. In order to compensate for lateral movements of the drive beam during the displacement, a horizontal shaft is arranged on the drive beam, on which shaft a drive rod/link is mounted so as to be displaceable transversely to the drive direction, so that the drive beam is displaceable laterally relative to the link in the mounting. At higher rotational speeds, this sliding movement can lead to correspondingly higher wear, in particular at the reversal point. The crank arm may be part of the rocker or mounted directly on a continuous upright shaft.

CH 703090 discloses a solution to eliminate wear (fig. 2). This solution avoids a pushing movement on the end of the link, but in each lift the bending force has to be overcome twice by the flexible link in order for the spring element to bend from its rest position. With this solution, the friction and wear experienced by the tilt guides supporting the drive beam are high.

In the transmission and guide device 1 according to the invention shown in fig. 3 to 7, reference numeral 3 denotes a bearing point (axle body) 3 for a crank arm 5, as in the prior art described in EP 1595990. The transmission of the movement from the bearing point 3 to the drive rod (link 7 for short) takes place via the crank arm 5. In contrast to the known embodiment shown in fig. 1, the drive-side end 7 'of the link 7 is not directly supported in the driven-side end 5' of the crank arm 5. The drive is effected from the crank arm 5 to the link 7 by means of a first joint 9, which is supported on one side on a crank pin 11 and on the other side on a link pin 13 located at the drive-side end 7' of the first joint 9 in a manner twisted by 90 °. That is, the first joint 9 provides a special construction of a cross joint which supports the link 7 in a pivotable manner perpendicular to the longitudinal extension of the drive beam 15 in order to absorb horizontal movements of the drive beam 15 relative to the link 7. This also enables an optimum transfer of the alternating load which is not insignificant. The drive beam 15 is only shown in dashed lines in fig. 4. In the other figures, the drive beam is not shown for the sake of clarity, only the guiding and transmission device 1 being shown. The upper end 7 ″ of the link rod 7 is likewise mounted in a rotatable manner by means of a link pin 13 in a second cross-point 17, which is constructed analogously to the lower first joint 9. The second joint 17 is rotatable on a journal 19. The journal 19 is part of a fastening element 21 which establishes a connection with the drive beam 15 and is screwed to the drive beam, for example.

A further bearing socket 23 is provided on the fastening element 21, on which a first rocker arm 25 is articulated so as to be rotatable at right angles to the journal 19. A third rocker arm 33 is articulated approximately in the centre of the first rocker arm 25, with one side articulated on the axis a and the other side rotatably articulated on the axis C. The axis C or an axle arranged thereon is connected in a positionally fixed manner via a base plate 28 to a carrier 27 which is fixed to the frame of the shuttle embroidery machine or directly to the shuttle embroidery machine. The second end of the first rocker arm 25 is hingedly connected to the first end of a second rocker arm 31 by a rocker pin 29 having an axis E. The second end of the second swing arm 31 is rotatably supported about the axis B. The axis B is arranged in a stationary manner on the base plate 28.

The three

rocker arms

25, 31 and 33 thus form a four-bar linkage comprising axes B and C which are fixed in position on the base plate 28, and axes a and E which can perform circular arc movements on the first rocker arm 25 with different radii.

Fig. 7 shows the final position of the drive beam 15. The end of the first rocker arm 25, which is arranged opposite the rocker pin 29 (axis), is mounted on the mounting socket 23 on the fastening element 21 so as to be pivotable on the drive beam 15 and so as to be pivotable about a pivot axis D arranged there.

The three

rocker arms

25, 31 and 33 and the hinge points of axes B and C on carriage 27 are shown in the schematic diagram of fig. 8. The fastening element 21, which is blocked by the link 7 (the link 7 is shown schematically), is not shown in detail, but the movement curve of the fastening element 21 and the movement curve of the drive beam 15 are indicated only by the arrow P. For the sake of clarity, the drive beam 15 to which the fastening element 21 is fixed is likewise not shown in the figures.

The working principle of the guiding and driving device 1 for the drive beam 15 is explained below. At least two guiding and driving devices 1 are engaged on the driving beam 15 and support and guide it on a path inclined to the vertical. The link 7 is connected in an articulated manner to the drive beam 15 via a fastening element 21, by means of which oscillating vertical movement the drive beam 15 is moved upwards and downwards along arrow P. Since the fastening element 21 and the drive beam 15 are connected to the first lever 25 by an articulated connection via the axis D, the transmission movement via the link 7 is not carried out vertically, but rather the first rocker arm 25, which is likewise articulated on the second and

third rocker arms

31, 33, moves the drive beam 15 in the horizontal direction H. As a result of the vertical movement P at the upper and lower reversal points of the link 7, a movement is simultaneously carried out, i.e. a vertical movement and a horizontal movement at the same time with the degree H of the drive beam 15. Due to the lateral displacement H of the drive beam 15 at the lower and upper reversal points of the link 7, the drive beam 15 moves on an approximately straight line which forms an angle α with the vertical, for example 15 °. The driving beam 15 is supported by a plurality of driving and guiding devices 1 arranged side by side along the driving beam 15 without using a fixedly arranged linear guiding member such as a guide rail as in the prior art shown in fig. 1 and 2, and thus, the driving beam 15 moves on a path having a desired acute angle and an approximately linear shape with respect to a vertical line. The transmission 1 is responsible not only for the lifting movement P of the drive beam 15, but also for the horizontal movement H of the drive beam 15 without the need for linear guide members. The transmission thus eliminates the two guided linear movements shown in fig. 1 and the linear movements at an acute angle to the vertical as shown in fig. 2 and the corresponding vibration-dependent bending of the link 7 for each lift and stitch of the embroidery machine.

The transmission device 1 can be used without changing its components for transmitting a drive beam 15 in a shuttle embroidery machine having several shuttle paths with an inclined position with respect to the vertical and extending in the opposite direction-alpha to the vertical. Starting from the position shown by the solid line in fig. 8, this switching can be simply carried out by rotating the third rocker arm 33 counterclockwise, thereby rotating the second rocker arm 31 clockwise to the position shown by the broken line. The transmission therefore works with exactly the same machine elements in both directions of rotation, so that the manufacturer can provide the means for both shuttle guides without having to add replacement elements, which in turn reduces costs and stock.

Claims

1. A shuttle embroidery machine having:

a drive beam (15) having drive pins fixed thereto for conjoint movement of a plurality of shuttle cars along a shuttle path disposed at an angle to the vertical,

and a drive and guide device (1) comprising a crank drive with a crank arm (5) and a connecting rod (7) for the linear movement of the drive beam (15) along a straight line substantially parallel to the shuttle path, characterized in that:

the drive and guide device (1) has a four-joint drive by means of the crank drive to produce a linear movement of the drive beam (15),

the four-joint comprises an arrangement of a plurality of rocker arms (25, 31, 33) coupled to each other, which arrangement is pivoted on a common crank drive and has a pivot position with the drive beam (15) which causes an almost linear movement vertically or horizontally at a default incline,

the multi-link assembly pivoted on the crank driver comprises a four-joint with three rocker arms (25, 31, 33), wherein a second rocker arm (31) and a third rocker arm (33) are pivoted on the frame of the embroidery machine, a first rocker arm (25) is pivoted with the second rocker arm (31) and the third rocker arm (33), the free end of the connecting rod (7) is pivoted and embedded on the first rocker arm (25),

the connecting rod (7) is pivotally connected to both the first rocker arm (25) and the crank arm (5), and

the pivotal connection between the connecting rod (7) and the first rocker arm (25) is carried out on the first rocker arm (25).

2. Shuttle embroidery machine according to claim 1, wherein the connecting rods (7) are connected to the crank arms (5) and the first rocker arm (25) by means of a respective joint (9, 17), comprising two respective journals (11, 19) at right angles to each other, the joints (9, 17) possibly being in the form of a cross joint.

3. Shuttle embroidery machine according to claim 2, wherein the first swing arm (25) is pivoted on a fastening element (21), the fastening element (21) also being pivoted with the connecting rod (7), and wherein the fastening element (21) is fixed on the driving beam (15).

4. The shuttle embroidery machine according to any one of claims 1 to 3, wherein the crank drive is connected to a double-armed lever which is drivable by an upright shaft driven by a main shaft.

5. The shuttle embroidery machine according to claim 2 or 3, wherein the crank drive and rocker arm (25, 31, 33) engaged on the drive beam (15) guide the drive beam in a linear movement path extending at an angle of + α or- α with respect to a vertical line.

6. The shuttle embroidery machine according to any one of claims 1 to 3, wherein:

the drive beam (15) is carried and driven in an oscillating manner by a plurality of four joints, the drive beam (15) being pivoted to the four joints and guided by the four joints on a path of movement extending obliquely to the vertical.

7. The shuttle embroidery machine according to any one of claims 1 to 3, wherein:

at least two drive and guide devices (1) on the drive beam (15) are fitted on the drive beam (15) at spaced-apart positions.

8. The shuttle embroidery machine according to claim 7, wherein:

the crank drives of the at least two drive and guide devices (1) are each connected to a two-armed lever which can be driven by a spindle which drives all the crank drives.