CN1226295A

CN1226295A - Rotating hook device for sewing machine and machine comprising same

Info

Publication number: CN1226295A
Application number: CN 97196671
Authority: CN
Inventors: 吉贝尔托·克雷库
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-24
Filing date: 1997-07-17
Publication date: 1999-08-18
Also published as: AU3767897A; IT1287321B1; WO1998003714A1; EP0918899A1; JP2000514685A; ITVI960120A1

Abstract

Rotating hook device for sewing machines, of the type which comprises a needle (A) which moves in a cyclic fashion, a main thread (F) through a fabric, comprising a stationary case which has a first substantially vertical axis of symmetry and is suitable to accommodate a spool of auxiliary thread (F'), a rotating hook (7) which is suitable to engage the loop of main thread (F) in order to wind it around the case (2) and tie it to the auxiliary thread (F') to form a stitch. The hook (7) is fitted so that it can rotate about a second axis which intersects the first one and is inclined with respect to it; supporting devices (12, 13) selectively support the case at its ends. This configuration allows to use spools (S) of auxiliary thread (F') which have a large capacity, reducing downtimes for reloading and considerably increasing the productivity of the sewing machines on which the device is applied.

Description

The rotating hook device of Sewing machines and comprise the machine of this device

The present invention relates to a kind of rotating hook device, this device is used in particular for industrial sewing machines, embroidery machine of KNOTTING STITCH or the like.

Another aspect of the present invention relates to a kind of Sewing machines, and this Sewing machines comprises rotating hook device.

The Sewing machines of conventional KNOTTING STITCH has a base station basically, formation is sewed the slidingsurface of fabric and is supporting the upper arm of sewing machine head, free end at head, head has an eedle, eedle can be between the stroke upper limit and stroke lower limit axially reciprocating so that pass a upper thread through fabric.

The device that is known as " embroidery crochet hook " is loaded on the bobbin that under the slidingsurface and detachably surrounds bottom line, and bottom line and upper thread interact to form stitching.

Conventional embroidery generally includes one with the crochet hook device and is essentially columniform ducted body, and this ducted body is loaded on a shaft end in a kind of mode of cantilever, and this is substantially perpendicular to the moving direction of eedle or is parallel to eedle; Above-mentioned embroidery is known as " horizontal axis embroidery crochet hook " and " vertical axis embroidery crochet hook " respectively with the crochet hook device.

Embroidery circumferentially has a hook members with the ducted body edge of crochet hook, hook members is suitable for engaging with the wire loop that forms after upper thread passes fabric, ducted body also has an axial cavity with stationary cylinder, and the bobbin of bottom line is detachably installed and rotatably held to same stationary shield on the cavity.

In first conventional type that is called as " shuttle embroidery crochet hook " is embroidered with the crochet hook device, ducted body is periodically swung with the angle above 180 ° around its axis, its objective is in order to engage upper thread and it to be shifted out outside the semicircle of bobbin, guide it and impel the whole rotation of its roll so that form stitching.

Speed when conventional shuttle embroidery is their operations with the defective of crochet hook device is defined, and this is the reason that the forward that replaces continuously owing to shuttle and negative sense quicken.Thereby, the machine of this embroidery with the crochet hook device is housed, although it is very accurate, seldom be suitable for the high-speed of modern industry sewing.

In order to overcome this defective, the second kind of conventional type embroidery that is known as " rotating hook embroidery crochet hook " is devised with the crochet hook device, wherein with the rotation of the axis of crochet hook, control upper thread and it is wound up on the bobbin and with bottom line ties a knot by pinhock along embroidery for pinhock.

These conventional rotating hook embroidery are compared with the crochet hook device with shuttle embroidery with the crochet hook device and are allowed a significantly sewing at a high speed; For example, use this embroidery and surpass 4000 stitchings of per minute with the sewing speed that the modern machines of crochet hook can reach.

The embroidery of all conventional type is to unload continually the restriction with productivity ratio that bottom line bobbin that capacity limits causes with another defective of crochet hook device.For example, used bobbin can hold the about 50m of line of 0.5mm and this capacity and is used to sew larger-diameter line such as thicker curtain, leather along with coiling and reduces rapidly in fact usually.

Because rotation at a high speed, issuable problem and the integrity problem of rotating member in dynamic equilibrium in order to increase the package capacity of bobbin, will have to increase quantity and the size of embroidery with crochet hook.

This defective is more obvious under the situation of using embroidery machine, and embroidery machine has many embroidery crochet hook device usually, and the crochet hook device has the bobbin of equal number, and its very frequent unloading causes considerable aborning shut-down.

And under the situation of using the yarn stitched thick and heavy curtain of major diameter, leather etc., the length of yarn that bobbin comprised can reduce more, thereby forces the operator very to finish the loading and unloading of bobbin continually.

Conventional embroidery is the restriction in its life-span with another defective of crochet hook device, and this is owing to be subjected to the rapid wearing of continuous phase mutual friction member.

An object of the present invention is by providing a kind of rotating hook device to eliminate above-mentioned defective, this rotating hook device is simple relatively and allow to increase considerably the productivity ratio of used Sewing machines, reduces the downtime.

An object of the present invention is to provide a kind of rotating hook device, this device is reliable, accurately and have a moving member of minimum number.

Another object of the present invention provides a kind of Sewing machines, and this Sewing machines comprises the device of the above-mentioned type.

According to the rotating hook device of the Sewing machines that is used for KNOTTING STITCH of claim 1, this purpose and these targets can both reach.

Dependent claims define according to minutia of the present invention and comprise the minutia of this sewing machine.

According to rotating hook device of the present invention and machine one preferably but be not that unique embodiment is described hereinafter and illustrates by means of the not restriction example of accompanying drawing, wherein:

Fig. 1 is the partial cross section front view of the Sewing machines with rotating hook device of prior art;

Fig. 2 has a rotating hook device Sewing machines partial cross section front view according to of the present invention;

Fig. 3 is that of Fig. 2 rotating hook device amplifies schematic side-view;

Fig. 4 is the detailed top view of Fig. 3 device;

Fig. 5 a to 5e is each diagram perspective drawing of the rotating hook device of Fig. 2 in an order of operation.

With reference to above-mentioned accompanying drawing, rotating hook device according to the present invention is illustrated and is indicated by reference number 1 usually.

This device is used for the KNOTTING STITCH Sewing machines, and this Sewing machines has an eedle A, and eedle A moves between the stroke upper limit and stroke lower limit so that upper thread F is passed the fabric that will be sewed with a kind of reciprocating form, and makes it and bottom line F ' interaction.

In a precalculated position, this device 1 under the slidingsurface of fabric, securely combine with Sewing machines and with other mechanism's co-operating of machine so that the generation stitching.

According to the present invention, device 1 comprises a cover 2, covers 2 cylindrical or preferably frustum build and tapers, has a vertical axis 3 on it, and this axis is arranged essentially parallel to eedle A.

Cover 2 has an axial shaft 4 in upper zone, and has an area supported 5 at lower region, on its sidewall, has one can open the insertion that part 6 is used for bottom line F ' bobbin.

Easily, cover 2 removable with convenient refill and/or common maintenance operation in the insertion of bobbin.

The bobbin S that preferably also is the frustum build is clearly greater than the bobbin of the common usefulness in the conventional similar device in the prior art.

According to the present invention, rotating hook 7 can be around second axis 8 rotation, and axis 8 intersects with the axis 3 that covers 2 and the angle between 0 ° and 90 ° of tilting, preferably near 12 °.

The configuration of pinhock is so that its surfaces of revolution approximately intersects at its center line with cover 2.

More particularly, pinhock 7 securely is connected with the free end of bar 9, and bar 9 is tightly packed in handle 10 in its opposite end, and by means of drive rod 11, handle 10 links to each other with external motors device M by device 11, and motor apparatus M links to each other with Sewing machines.

After eedle A passed fabric, pinhock 7 was by rotating into the wire loop that upper thread F forms, and pulling upper thread F is around cover 2, made itself and bottom line F ' knotting.

According to the present invention, this device comprises a unit that is used for supporting cover 2, this unit its vertically end selection effect so that at a resting position supporting cover, thereby allow pinhock 7 and rotate freely and allow the line F that ties a knot and F ' towards handle 4 outside extractions out around the line F of cover 2.

Particularly, bearing unit comprises a pair of clamping element 12, and clamping element interacts with the handle 4 and the push rod 13 of a kind of periodic mode with cover 2, and push rod 13 periodically acts on the low area supported 5 of cover 2.Clamping element 12 and push rod 13 optionally interact, and its objective is in order to hang cover 2 a position static basically with respect to pinhock 7.

More particularly, clamping element 12 by two jaws 12 ', 12 " constitute; jaw 12 ' and 12 " alternately mobile between first clamped position of handle 4 and second disengaged position, push rod 13 is made of dish 14, engages with the end of bar 15 to tight week of dish, and bar 15 can alternately move between lower position and higher position, the low surface 5 of lower position and cover separates, and the higher position is in contact with one another with surface 5.

Easily, clamping element 12 is synchronous so that the former clamped position is consistent with the latter's spaced position with push rod 13.

Be provided for driving the unit of clamping element 12 and push rod 13, this unit is by one or more cam 16,16 ' constituting, cam operationally is connected with the motor M of Sewing machines, and according to the reciprocating motion synchronization action with eedle A of rotatablely moving of predetermined standard and pinhock 7.For example, might with the cam of tubular and/or complementary contours and by means of suitable transmission device act on jaw 12 ', 12 " and on the bar 15.

As a kind of selection, driver element may be electromagnetic type or air-driven type.

In order to guide upper thread F rotation around cover 2, first guide unit is made of separator 17, and separator 17 is made up of hard wire, and wire is V-shaped basically, and its end is close to cover 2, and its top protrudes in outside the cover.

Similarly, second unit 18 is used to guide bottom line F ', and Unit second is loaded in the cover 2 and is suitable for a kind of controllable mode release wire F ', thereby keeps its tension force and withdrawal speed constant.

These second guide units are made of a substantially horizontal elongated extension 19, extension 19 is rotatable and around the coaxial line rotation of the upper end of cover 2, and a through wires hole 20 is arranged at the free end of extension, by this through wires hole of bottom line F ' process of unwinding on the bobbin, extension 19 combines with the tension-adjustable spring 21 that acts on the online F '.

Fig. 5 a to 5e shows the order of operation according to rotating hook device of the present invention.

Allow to reduce downtime of used Sewing machines according to device according to the present invention, based on such fact: cover can hold than common used bobbin and has obvious jumbo bobbin, thereby has increased its productivity ratio to a great extent.Constructional minimizing simple and moving member quantity allows the high sewing of acquisition speed, thereby guarantees reliable and accurate.

The linear slit that produces can not break, and these can take place in the past, and therefore from the viewpoint of aesthetic vision, linear slit is more strong and more make us pleasing.

According to another aspect of the present invention, the Sewing machines of KNOTTING STITCH comprises the rotating hook device of the above-mentioned type and comprises the head T that links to each other with base station B by means of arm c.

Head T is supporting yarn tension bar 22, and the yarn tension bar can move back and forth between upper position and lower position, and at upper position, upper thread F is stretched, and lower position is used to discharge the previous stretched portion of the line that is used to form stitching.

According to the present invention, yarn tension bar 22 has the through wires hole 23 and 24 that two yarns pass through at least, two through wires holes are very short at interval each other and be formed at the free end of bar so that the insertion of each wire loop, thereby be convenient in each stroke tensioning/release, thread segment, this thread segment is the twice of the thread segment of in the past conventional yarn tension bar, and in the past tension rail length with identical now, but the through wires hole that has only single line to pass through.As a kind of selection, the end of head can be divided into two parts, and two parts respectively have a through wires hole.

Allow many changes and variation according to rotating hook device of the present invention and Sewing machines, all these are all below within the scope of the represented inventive concept of claims.All details can be replaced by identical technology, and these identical technology are understood that to be protected by the present invention.

Claims

1. the rotating hook device that is used for the Sewing machines of KNOTTING STITCH, such device comprises that has a reciprocating eedle (A), this eedle is suitable for drawing the fabric of a upper thread (F) through being sewed, thereby form a wire loop, wherein, said device comprises a cover (2), first symmetry axis (3) that cover (2) has a perpendicular, and cover is suitable for holding the bobbin (S) of a bottom line (F '), rotating hook (7) be suitable for engaging with the said wire loop of upper thread (F) in case around said cover (2) reel it and with bottom line (F ') knotting, thereby form stitching; It is characterized in that, said pinhock (7) can rotate around second axis (8), second axis intersects with said first axle (3) and tilts with respect to first axle, the device that is had (12,13,14,15) optionally support said cover (2) in resting position, its objective is in order to allow that pinhock (7) rotates freely around said cover (2) on predetermined plane at its vertical end.

2. according to the device of claim 1, it is characterized in that the surfaces of revolution of pinhock (7) and said cover (2) intersect.

3. according to the device of claim 1, it is characterized in that, said second axis (8) with respect to the inclination angle (E) of said first axle (3) between 0 ° and 90 °.

4. according to the device of claim 1, it is characterized in that said inclination angle (E) approaches 12 °.

5. according to the device of claim 1, it is characterized in that, said pinhock (7) securely links together with the end of bar (9), bar (9) is close to together at its relative end and handle (10), handle (10) links to each other with an external motors device (M) by a drive unit (11), and motor apparatus is suitable for making the reciprocating motion of itself and said eedle (A) to rotate synchronously.

6. according to the device of claim 6, it is characterized in that said cover (2) has the low area supported (5) at a top footstalk (4) and a center.

7. according to the device of claim 1, it is characterized in that said cover (2) is removable and have a device for opening (6) that is used for inserting and holding said bobbin (S).

8. according to the device of claim 1, it is characterized in that said cover (2) is essentially one and has the cylindrical of vertical axis.

9. according to the device of claim 1, it is characterized in that cover (2) has frustum-shaped basically, cover is tapered up.

10. according to the device of claim 1, it is characterized in that, said bracing or strutting arrangement (12,13,14,15) comprise two clamping elements (12 ', 12 "); clamping element optionally interacts with said handle (4) and push rod (13), push rod (13) optionally acts on said low surperficial (5) of cover (2).

11. device according to claim 10, it is characterized in that, said clamping element (12 ', 12 ") can between first clamped position of handle (4) and second disengaged position, move in reciprocating mode; and said push rod (13) can move in reciprocating mode between lower position and higher position; and lower position and said low surface (5) separate, and contact with low surperficial (5) in the higher position.

12. the device according to claim 10 is characterized in that, said clamping element (12 ', 12 ") and said push rod (13) synchronous operation are so that the clamped position of said clamping element is consistent with the interval location of said push rod.

13. the device according to claim 10 is characterized in that, said low push rod (13) is made of a dish (14) basically, and dish (14) is connected with the end of bar (15) securely.

14. device according to claim 1, it is characterized in that, described device has periodic driver element (16,16 ') be used to drive said clamping element (12 ', 12 ") and said push rod (13); driver element links to each other with outside motor apparatus (M) and according to predetermined standard, with the reciprocating motion synchronous effect with said eedle (A) of rotatablely moving of said pinhock (7).

15. the device according to claim 14 is characterized in that, said periodic driver element (16,16 ') is the mechanical cam type.

16. the device according to claim 14 is characterized in that, said periodic driver element is an electromagnetic type.

17. the device according to claim 14 is characterized in that, said periodic driver element is an air-driven type.

18. device according to one or more aforesaid claims, it is characterized in that, this device comprises first guide unit, and this unit is made of a distance piece (16), and distance piece securely is connected with said cover (2) and is used at said process guiding said upper thread (F) around the cover rotation.

19. device according to claim 1, it is characterized in that, this device has second guide unit (17) that is used for bottom line (F '), second guide unit is loaded in the said cover (2) and is suitable for controllably discharging bottom line (F '), thereby keeps its tension force and constant by the continuous unwinding speed on the bobbin (S).

20. KNOTTING STITCH formula Sewing machines, comprise a base station (B), an arm (C) and a head (T), an eedle (A) is housed on the head, eedle can reciprocating motion between the stroke upper limit and stroke lower limit, thereby its objective is in order periodically a upper thread to be passed fabric to form stitching, it is characterized in that it comprises the rotating hook device according to one or more aforesaid claims.

21. Sewing machines according to claim 20, it is characterized in that, said head (T) is equipped with a yarn tension bar (22), tension rail complex form in the past moves and is synchronized with the movement with said eedle (A), controllably spur and discharge the related upper thread of sewing manipulation (F), said yarn tension bar (22) has two through wires holes (23,24) at least, is used for each wire loop of said upper thread (F) and passes through.