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Title:
YARN CATCHER ASSEMBLY OF AN AUTOMATIC BUTTON SHANK WRAPPING MACHINE AND AUTOMATIC BUTTON SHANK WRAPPING MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/095109
Kind Code:
A1
Abstract:
A yarn catcher assembly of an automatic button shank wrapping machine comprises: a support frame (10) with a first and second side, two first drivers (20), two yam catchers (50), and a mounting plate (90). The first drivers (20) are mounted on the first side. Driving shafts (130) of the first drivers (20) are connected to the yarn catchers (50) and go through the first side. Each yam catcher (50) has a yam disc catcher. The mounting plate (90) is mounted on the second side, and is provided with mounting grooves (110) for mounting the yarn catchers (50). The first drivers (20) have a first operating state, in which the yam catchers (50) are driven to detach from the mounting grooves (110) to catch the yam by the yam disc catcher, and a second operating state, in which the yam catchers (50) are located in the mounting grooves (110) to hold the yam between the yarn disc catcher and the mounting plate (90).

Inventors:
SCHÄRER PIERRE ANDRÉ (CH)
Application Number:
IB2019/001197
Publication Date:
May 14, 2020
Filing Date:
November 05, 2019
Export Citation:
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Assignee:
ASCOLITE SHENZHEN TRADING CO LTD (CN)
International Classes:
D05B65/00; D05B65/06
Foreign References:
CN209052869U2019-07-02
CN204023172U2014-12-17
CN102583046A2012-07-18
US2910824A1959-11-03
CN205205391U2016-05-04
CN203382929U2014-01-08
CN204919011U2015-12-30
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Claims:
CLAIMS:

1. A yarn catcher assembly of an automatic button shank wrapping machine, comprising:

a support frame (10) which has a first side and a second side facing in opposite directions;

two first drivers (20) that are mounted on the first side of the support frame (10), wherein each of the first drivers (20) has a driving shaft (130) which extends through the first side of the support frame (10);

two yarn catchers (50) which are respectively connected to the driving shafts (130) of the first drivers (20) , wherein each yarn catcher (50) has a yarn disc catcher (60);

a mounting plate' (90) for the yarn catchers (50), which is mounted on the second side of the support frame (10) , wherein the mounting plate (90) is provided with two mounting grooves (110), and wherein the two yarn catchers (50) are respectively assigned to the two mounting grooves (110);

each of the first drivers (20) having a first operating state, in which the respective yarn catcher (50) is driven to detach from the assigned mounting groove (110) of the mounting plate (90), and a second operating state, in which the respective yarn catcher (50) is driven to retreat back to the assigned mounting groove (110) of the mounting plate (90); and wherein, in the first operating state, the yarn disc catcher (60) of the respective yarn catcher (50) is ready to catch the yarn, and, in the second operating state, the yarn disc catcher (60) of the respective yarn catcher (50) together with the mounting plate (90) for the yarn catchers (50) holds the yarn.

2. The yarn catcher assembly according to claim 1, wherein the first driver (20) is a pneumatic actuator, and wherein the two first drivers (20) are connected to the two yarn catchers (50) correspondingly.

3. The yarn catcher assembly according to claim 1 or 2, wherein the yarn catcher (50) has a connecting portion (501), a connecting rod (70) connecting the connecting portion (501) and the yarn disc catcher (60), wherein the connecting portion (501) is provided with a connecting hole (80), the first driver (20) being fixedly connected to the connecting hole (80) via the driving shaft (130) .

4. The yarn catcher assembly according to claim 3, wherein the yarn disc catcher (60) comprises a mounting rod (601) connecting to the connecting rod (70), wherein a free end of the mounting rod (601) is provided with a first disc (602); and wherein, in the second operating state of the first driver (20), the mounting rod (601) is inserted into the mounting groove (110), and the first disc (602) is in touch with the surface of the mounting plate (90) which faces the support frame ( 10 ) .

5. The yarn catcher assembly according to claim 3 or 4, wherein the connecting portion (501) is a convex plate that protrudes from the connecting rod (70), the convex plate and the yarn disc catcher (60) being arranged at the same lateral side of the connecting rod (70), wherein an end of the convex plate that is remote from the connecting rod (70) is provided with the connecting hole (80) .

6. The yarn catcher assembly according to any one of claims 3 to 5, wherein the driving shaft (130) comprises a cylindrical rod and a nut on one end of the cylindrical rod, wherein a free end of the cylindrical rod is inserted into the connecting hole (80), while the other end of the cylindrical rod is mounted in a through hole of the first driver (20) .

7. The yarn catcher assembly according to any one of claims 3 to 6, wherein the yarn disc catchers (60) of the two yarn catchers (50) are close to each other, while the connecting portions (501) of the two yarn catchers (50) are further apart from each other;

a groove (901) being provided at the mounting plate (90) for the yarn catchers (50) inbetween the two yarn disc catchers (60), which groove (901) opens at a peripheral surface of the mounting plate (90) .

8. The yarn catcher assembly according to any one of the preceding claims, further comprising a second driver (30) which is connected to the support frame (10) for driving the movement of the support frame (10), the yarn catchers (50) and the mounting plate (90) for the yarn catchers (50), so that the yarn held by the yarn catchers (50) can be pulled off.

9. The yarn catcher assembly according to claim 8, wherein a spacer (120) is provided between the second driver (30) and the support frame (10).

10. An automatic button shank wrapping machine, wherein the machine comprises the yarn catcher assembly according to any one of the preceding claims.

Description:
YARN CATCHER ASSEMBLY OF AN AUTOMATIC BUTTON SHANK WRAPPING

MACHINE AND AUTOMATIC BUTTON SHANK WRAPPING MACHINE

TECHNICAL FIELD OF THE INVENTION

The present invention relates to the field of an automatic button shank wrapping machine, particularly, to a yarn catcher assembly of an automatic button shank wrapping machine and an automatic button shank wrapping machine comprising such yarn catcher assembly.

BACKGROUND OF THE INVENTION AND PRIOR ART

In the prior art as disclosed in, e.g., document EP 0 923 655 B1 (Fig. 5), one end of a yarn catcher assembly of an automatic button shank wrapping machine is fixedly connected to other parts, and a hook part on the other end of the yarn catcher assembly is driven by a cylinder to get close to a V-shaped opening of a whipping plate, thus achieving yarn catching. In the existing design of two yarn catchers, the hook part of the respective yarn catcher cannot get close to the V-shaped opening of the whipping plate. During yarn catching, the yarn catcher and a winding reel are far from the V-shaped opening of the whipping plate, and require long yarn between them. After yarn breakage, the yarn wastage is long, causing high cost for yarn wastage.

OBJECT OF THE INVENTION

The object of the present invention is to propose a yarn catcher assembly of an automatic button shank wrapping machine and an automatic button shank wrapping machine including such yarn catcher assembly, capable of shortening the yarn wastage after yarn breakage, so as to cut yarn costs. Further, a better yarn breakage effect would be desirable.

SUMMARY OF THE INVENTION

The above object is solved by the features specified in claims

1 and 10, respectively. Advantageous and appropriate developments of the invention form the subject matter of claims

2 to 9.

According to the present invention a yarn catcher assembly of an automatic button shank wrapping machine comprises a support frame which has a first side and a second side facing in opposite directions; two first drivers that are mounted on the first side of the support frame, wherein each of the first drivers has a driving shaft which extends through the first side of the support frame; two yarn catchers which are respectively connected to the driving shafts of the first drivers, wherein each yarn catcher has a yarn disc catcher; a mounting plate for the yarn catchers, which is mounted on the second side of the support frame, wherein the mounting plate is provided with two mounting grooves, and wherein the two yarn catchers are respectively assigned to the two mounting grooves; each of the first drivers having two operating states, in the first operating state the respective yarn catcher is driven to detach from the assigned mounting groove of the mounting plate, and in the second operating state the respective yarn catcher is driven to retreat back to the assigned mounting groove of the mounting plate; and wherein, in the first operating state, the yarn disc catcher of the respective yarn catcher is ready to catch the yarn on the automatic button shank wrapping machine, and, in the second operating state, the yarn disc catcher of the respective yarn catcher together with the mounting plate for the yarn catchers holds the yarn. Optionally, the first driver is a pneumatic actuator, wherein the two first drivers are connected to the two yarn catchers correspondingly.

Optionally, the yarn catcher has a connecting portion, a connecting rod connecting the connecting portion and the yarn disc catcher, wherein the connecting portion is provided with a connecting hole, the first driver being fixedly connected to the connecting hole via the driving shaft.

Optionally, the yarn disc catcher comprises a mounting rod connecting to the connecting rod, wherein a free end of the mounting rod is provided with a first disc; and wherein, in the second operating state of the first driver, the mounting rod is inserted into the mounting groove of the mounting plate for the yarn catchers, and the first disc is in touch with the surface of the mounting plate for the yarn catchers, which faces the support frdme.

Optionally, the connecting portion is a convex plate that protrudes from the connecting rod, the convex plate and the yarn disc catcher being arranged at the same lateral side of the connecting rod, wherein an end of the convex plate that is remote from the connecting rod is provided with the connecting hole .

Optionally, the driving shaft comprises a cylindrical rod and a nut on one end of the cylindrical rod, wherein a free end of the cylindrical rod is inserted into the connecting hole, while the other end of the cylindrical rod is mounted in a through hole of the first driver.

Optionally, the yarn disc catchers of the two yarn catchers are close to each other, while the connecting portions of the two yarn catchers are further apart from each other; a groove being provided at the mounting plate for the yarn catchers inbetween the two yarn disc catchers, which groove opens at a peripheral surface of the mounting plate.

Optionally, the yarn catcher assembly of the automatic button shank wrapping machine also comprises a second driver which is connected to the support frame for driving the movement of the support frame, the yarn catchers and the mounting plate for the yarn catchers, so that the yarn held by the yarn catchers can be pulled off.

Optionally, a spacer is provided between the second driver and the support frame.

The present invention also provides an automatic button shank wrapping machine, comprising the aforesaid yarn catcher assembly of an automatic button shank wrapping machine. As to the structure of the yarn catcher assembly of the automatic button shank wrapping machine, it can be referred to the above description, so as to avoid repetitions here. Optionally, in a twin design, the automatic button shank wrapping machine may comprise two yarn catcher assemblies as described above, each assigned to one of two V-shaped openings in the whipping plate. In such design the automatic button shank wrapping machine is capable of simultaneously securing two buttons at once.

In the technical solution described above, with the change of the known yarn catcher assembly structure of the automatic button shank wrapping machine, the connecting hole at the connection end of the respective yarn catcher is directly connected to the driving shaft of the first driver, and the yarn catcher in the yarn catcher assembly of the automatic button shank wrapping machine is driven by the first driver for movement. As the yarn catcher in the yarn catcher assembly of the automatic button shank wrapping machine is only placed in the mounting plate, and is not fixedly connected to the mounting plate of the yarn catcher assembly, when driving the yarn catcher to move, the first driver only pulls the yarn catcher out of the assigned mounting plate groove, and the mounting plate for the yarn catchers does not move with the yarn catcher. In this way, the yarn catcher can get closer to the V-shaped opening of the whipping plate to accomplish yarn catching. When the distance between the yarn catcher and the V- shaped opening of the whipping plate is small, the yarn reguired to connect the yarn catcher with the button shank held in the V-shaped opening of the whipping plate is reduced. When the second driver drives the entire yarn catcher assembly of the automatic button shank wrapping machine to move downward, i.e. away from the button shank, the yarn between the yarn catcher and the button shank held in the V-shaped opening of the whipping plate would be pulled off with a yarn wastage of short length only, thus cutting the cost. During yarn breakage, the yarn is held firmly by the respective yarn disc catcher and the mounting plate, and would not move, thus achieving a better yarn breakage effect.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinbelow, the invention will be explained in more detail on the basis of a preferred example of embodiment and with reference to the appended, schematic drawings. In the drawings:

FIG. 1 is a perspective side view of a yarn catcher in a yarn catcher assembly of an automatic button shank wrapping machine according to the present invention; FIG. 2 is a left side view of the yarn catcher in the yarn catcher assembly of the automatic button shank wrapping machine according to the present invention;

FIG. 3 is a front view of a mounting plate in the yarn catcher assembly of the automatic button shank wrapping machine according to the present invention;

FIG. 4 is an assembly drawing of the yarn catcher assembly of the automatic button shank wrapping machine according to the present invention; and

FIG. 5 is an exploded view of the yarn catcher assembly of the automatic button shank wrapping machine according to the present invention.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

The technical solution of an embodiment of the present invention will be clearly and completely described with reference to the accompanying drawings. Apparently, the embodiment in the following description is merely an example, but is not the only way to carry out the technical teaching claimed in the appended claims .

It should be noted that directional indications (such as upper, lower, left, right, front, and rear) are to be understood with respect to the relative positional relationship and movement of each component under a particular angle of view (as shown in the drawings) . The directional indications shall change when the particular angle of view is changed.

In addition, the terms "first" and "second" in the documents at hand are used solely for simpler description, and should not be understood as an indication or implication of relative importance or the number of technical features specified. Therefore, features specified with "first" and "second" can indicate or imply at least one such feature. In addition, the technical features of the embodiment may be combined with each other in any way, provided that such combination can be realized by persons skilled in the art. When the combination is contradictory or cannot be realized, it should be understood that such combination does not exist, and is not within the protection scope of the appended claims.

Figures 1 to 5 show a yarn catcher assembly of an automatic button shank wrapping machine. In general, the yarn catcher assembly of the automatic button shank wrapping machine comprises a support frame 10 which has a first side and a second side facing in opposite directions. Two first drivers 20 are mounted on the first side of the support frame 10, wherein each of the first drivers 20 has a driving shaft 130 which extends through the first side of the support frame 10.

Further, two yarn catchers 50 are provided, which are respectively connected to the driving shafts 130 of the first drivers 20, wherein each yarn catcher 50 has a yarn disc catcher 60.

Furthermore, a mounting plate 90 of the yarn catcher assembly is mounted on the second side of the support frame 10, wherein the mounting plate 90 of the yarn catcher assembly is provided with two mounting grooves 110. The two yarn catchers 50 are respectively arranged in the two mounting grooves 110 of the mounting plate 90 of the yarn catcher assembly.

Each of the first drivers 20 has a first operating state, in which the respective yarn catcher 50 is driven to detach from the assigned mounting groove 110, and a second operating state, in which the respective yarn catcher 50 is driven to retreat back to the assigned mounting groove 110. In the first operating state, the yarn disc catcher 60 of the respective yarn catcher 50 is ready to catch the yarn on the automatic button shank wrapping machine, and, in the second operating state, the yarn disc catcher 60 of the respective yarn catcher 50 together with the mounting plate 90 of the yarn catcher assembly holds the yarn.

In this embodiment, a first one of the first drivers 20 drives the assigned yarn catcher 50 to move towards a wrapping wheel (not shown) of the automatic button shank wrapping machine, so that the yarn catcher 50 catches the yarn in the first operating state. When the yarn catcher 50 has caught the yarn, the first driver 20 moves the yarn catcher 50 back to the mounting groove 110 in the mounting plate 90 of the yarn catcher assembly, namely, in the second operating state.

Then, the wrapping wheel will wrap the thread on the button shank. After the wrapping is finished, a second one of the first drivers 20 moves the assigned yarn catcher 50 out towards the wrapping wheel to catch the same yarn again, and the first driver 20 moves the yarn catcher 50 back to the mounting groove 110 in the mounting plate 90 of the yarn catcher assembly to again reach the second operating state. The two yarn catchers 50 catch the yarn alternately. When the yarn catching is finished, the two yarn catchers 50 are situated in the mounting grooves 110 of the mounting plate 90.

Then, a second driver 30 drives the yarn catcher assembly of the automatic button shank wrapping machine down or away from the wrapping wheel to pull off the yarn between the yarn catcher assembly and the button. Thereafter, the second driver 30 drives the yarn catcher assembly of the automatic button shank wrapping machine to revert to the initial state. During this process, one yarn catcher 50 will hold the yarn, while the other yarn catcher 50 will be moved from the second operating state to the first operating state and vice versa. When the respective first driver 20 drives the assigned yarn catcher 50 out of the mounting groove 110 after yarn breakage, the yarn wastage will detach from the yarn catcher 50, and so on.

As the yarn disc catcher 60 can get very close to a V-shaped opening of a whipping plate - not shown here, but illustrated in document EP 0 923 655 Bl, Fig. 5: whipping plate 3, slot 5 - of the automatic button shank wrapping machine, the yarn wastage been pulled off is short only, thereby reducing the yarn cost. Further, it is to be noted that the wrapping wheel is the subject of a parallel, i.e. filed on the same application date, International Application PCT/EP2019/XXXXXX with the title "wrapping wheel of an automatic button shank wrapping machine and automatic button shank wrapping machine", to which at this point express reference is made with regard to the structure and function thereof for avoidance of repetitions .

In the embodiment described above, the first driver 20 is a pneumatic actuator, wherein the two first drivers 20 are connected to the two yarn catchers 50 in a corresponding manner. Specifically, the pneumatic actuator can be a cylinder.

Further, in the embodiment described above, a mounting hole 100 in the mounting plate 90 can have a trapezoid shape as seen in a longitudinal section. For a more stable connection between the mounting plate 90 and the support frame 10, more than one mounting hole 100 can be provided, as shown in Fig. 3.

In the embodiment shown (see Figures 1 and 2), the yarn catcher 50 has a connecting portion 501, wherein a connecting rod 70 connects the connecting portion 501 and the yarn disc catcher 60. Further, the connecting portion 501 is provided with a connecting hole 80, wherein the first driver 20 is fixedly connected to the connecting hole 80 via the driving shaft 130. For a stable connection between the yarn catcher 50 and the first driver 20, the connecting hole 80 is formed as a through hole in the connecting portion 501 of the yarn catcher 50.

In this embodiment, the yarn disc catcher 60 comprises a mounting rod 601 connected to the connecting rod 70, wherein the free end of the mounting rod 601 is provided with a first disc 602. In the second operating state, the mounting rod 601 is inserted into the mounting groove 110, and the first disc 602 is in touch with the surface of the mounting plate 90 that faces the support frame 10 (see Fig. 4 on the left hand side for the yarn disc catcher 60 in the foreground) . During the second operating state, the first disc 602 remains in touch with the surface of the mounting plate 90 which is near the support frame 10, for a better holding of the yarn. During yarn breakage, the yarn is held firmly by the first disc 602 and the mounting plate 90, so that the yarn does not move during yarn breakage, thus achieving a better yarn breakage effect.

In the embodiment shown (see Fig. 1) , the connecting portion 501 is a plate of convex shape that protrudes from the connecting rod 70, wherein the convex plate and the yarn disc catcher 60 are arranged at the same lateral side of the connecting rod 70. The end of the convex plate that is remote from the connecting rod 70 is provided with the connecting hole 80. The connecting portion 501 bulges away from the connecting rod 70, and the thickness of the connecting portion 501 is obviously greater than that of the connecting rod 70. As a result of this, the connecting hole 80 in the connecting section 501 has a greater depth, thereby providing a better connection to the driving shaft 130 and thus the first driver

20. Further, for a more stable yarn catcher structure, a reinforcement wall 502 (see Figs. 1 and 2) is provided between the end of the connecting portion 501 that is remote from the connecting rod 70 and the connecting rod 70. By means of the reinforcement wall 502, the connection area between the connection portion 501 and the connecting rod 70 is larger, thereby achieving a more stable structure. As shown in Figs. 1 and 2, the contour of the reinforcement wall 502 can be an inclined surface with a slope that increases from the connecting rod 70 to the connection portion 501. When the first driver 20 drives the yarn catcher 50, the connection between the connection portion 501 and the connecting rod 70 is not prone to breakage. The yarn catcher can be made in one piece.

In the embodiment shown (see Fig. 5), the driving shaft 130 comprises a cylindrical rod and a nut on one end of the cylindrical rod, wherein a free end of the cylindrical rod inserts into the connecting hole 80 of the connection portion 501, while the other end of the cylindrical rod is mounted in a through hole of a nut connecting piece 40 of the first driver 20. Accordingly, the two ends of the driving shaft 130 are inserted into the connecting hole 80 of the connecting portion 501 and the through hole of the nut connecting piece 40 of the first driver 20 so that the connection is more stable. Thereby the nut at the free end of the cylindrical rod serves to lock the cylindrical rod with a predetermined penetration depth in the connecting hole 80 of the respective yarn catcher 50.

In the embodiment shown, the yarn disc catchers 60 of the two yarn catchers 50 are close to each other, while the connecting portions 501 of the two yarn catchers 50 are further apart from each other. As can be derived from Fig. 3, a groove 901 is provided at the mounting plate 90 inbetween the two yarn disc catchers 60. The groove 901 opens at the peripheral surface of the mounting plate 90, wherein the groove is beneficial for a good removal of the thread wastage.

In the embodiment shown, the yarn catcher assembly of the automatic button shank wrapping machine also comprises a second driver 30. The second driver 30 is connected to the support frame 10 for driving the movement of the support frame 10, the yarn catchers 50 and the mounting plate 90 of the yarn catchers 50, so that the yarn held by the yarn catchers 50 can be pulled off. The connected second driver 30 drives the yarn catcher assembly of the automatic button shank wrapping machine for relative displacement with respect to the button shank to finish yarn breakage. However, the yarn can also be cut by other parts or be manually pulled off.

In the embodiment shown (see Fig. 5), a spacer 120 is provided between the second driver 30 and the support frame 10. The spacer 120 can prevent sliding displacement or corrosion when the second driver 30 drives the yarn catcher assembly of the automatic button shank wrapping machine.

The present invention also provides for an automatic button shank wrapping machine, which comprises the above described yarn catcher assembly of an automatic button shank wrapping machine. The detailed structure and function of the yarn catcher assembly of the automatic button shank wrapping machine have been described above already, this is why the related description is not repeated here.

The above embodiment is merely a preferred embodiment of the present invention, and should not be understood to limit in any way the present invention as defined by the appended claims.

A yarn catcher assembly of an automatic button shank wrapping machine comprises: a support frame with a first and second side, two first drivers, two yarn catchers, and a mounting plate. The first drivers are mounted on the first side. Driving shafts of the first drivers are connected to the yarn catchers and go through the first side. Each yarn catcher has a yarn disc catcher. The mounting plate is mounted on the second side, and is provided with mounting grooves for mounting the yarn catchers. The first driver has a first operating state, in which the yarn catchers are driven to detach from the mounting grooves to catch the yarn by the yarn disc catcher, and a second operating state, in which the yarn catchers are located in the mounting grooves to hold the yarn between the yarn disc catcher and the mounting plate.

LIST OF REFERENCE NUMERALS support frame

first driver

second driver

nut connecting piece

yarn catcher

yarn disc catcher

connecting rod

connection hole

mounting plate

mounting hole

mounting groove

spacer

driving shaft

connecting portion

reinforcement wall

mounting rod

first disc

groove