KR20060050815A - Sewing machine - Google Patents

Abstract

 A differential feed mechanism for varying the front and rear operation amount of the front feed tooth arranged at the tip of the cylindrical bed with respect to the front and rear operation amount of the post feed tooth is placed inside the sewing body by a swinging arm arranged inside the sewing arm. While connecting by means of a connecting link, the operation of the differential control means from the outside of the sewing machine body is transmitted to the swinging arm, and the differential feed mechanism is operated by the swinging of the swinging arm to reduce the forward and backward operating amount of the previous feed tooth. The vertical type sewing machine which makes it possible to implement | achieve the adjustment operation of the differential feed mechanism arrange | positioned inside the base part of a cylindrical bed quickly and surely from the outside of a sewing machine main body by the structure which changes.

sewing machine

Description

Sewing machine {SEWING MACHINE}

1 is a perspective view briefly showing the appearance of a sewing machine according to the present invention.

It is a side view which shows the structure of the principal part of the feed drive system of the sewing machine which concerns on this invention.

FIG. 3 is a perspective view briefly showing a connection relationship of each part of the feed drive system shown in FIG.

4A and 4B are explanatory views showing the effect of the front end position of the rocking arm on the front and rear motion of the front conveyer;

 The present invention is provided with a main feed dog (Differential Feed Dog) and a main feed dog (Differential Feed Dog) at the tip of the cylindrical bed (Cylinder Bed) protruding on one side of the sewing machine main body, It relates to a longitudinal cylinder bed sewing machine for applying a feed in the axial length direction of a cylindrical bed.

Sewing of cylindrical parts such as sleeves and torso parts of various medical products is carried out by sealing the end edges overlapping each other with a cloth in the shape of a barrel. For such sewing, conventionally, a vertical sewing machine is provided with a sewing arm and a cylindrical bed which are substantially parallel and projected in the same direction above and below a sewing machine main body having a built-in sewing spindle.

The sewing by such a cylindrical sewing machine passes a tubular fabric through the tip of the tubular bed, and the overlapping portion of the fabric is pushed down from the tip of the sewing plate and the sewing arm provided at the tip of the tubular bed. (Axial Feed) is sandwiched between the presser foot and the feed dogs in the axial length direction from the tip of the tubular bed to the base end are applied by the operation of the feed dogs arranged inside the tubular bed. Is done.

The movement of the feed tooth inside the tubular bed is an elliptic motion caused by a combination of up and down movements and forward and backward movements, and the conveyance of the fabric is applied by the feed teeth moving backward on the needle plate in the upper position. In addition, the cylindrical sewing material obtained in the state which was able to be put in the base end part of a cylindrical bed by such sewing is pulled up to a front end side of a cylindrical bed, and collect | recovered.

The elliptical motion of the feed tooth, as is widely known, converts the rotation of the sewing machine spindle into the swing of the up and down feed arm and the forward and backward feed arm by means of respective eccentric rings, and the swing of the feed arm is transferred to each feed. It is realized by transferring it to the feed tooth via the link. However, in the longitudinal type of sewing machine, since the feed teeth of the tip of the cylindrical bed are located at a distance from the sewing spindle of the inside of the sewing machine body, for example, as described in No. 467155 of the Republic of China, it is transferred to the tip. A rod-shaped feed bar holding the teeth is spread in the axial length direction inside the tubular bed, and the eccentric ring and the feed are transferred between the base of the feeder and the sewing machine spindle. A transfer mechanism including an arm and a transfer link is constructed to respond.

However, in the flat covering chainstitch machine and the double chainstitch machine, the feed teeth (differential feed teeth and the main feed teeth) are provided before and after the needle needle position to separate forward and backward movement strokes of these feed teeth.各別) There are things that can be changed and adjusted. This change adjustment is realized by specially providing the transfer arms (differential transfer arm and main transfer arm) for the forward and backward movement of both transfer teeth, and changing the swing amount of such transfer arms. As a result, the feed adjustment for changing the feed amount of the cloth by collectively changing the forward and backward movement strokes of the differential feed tooth and the main feed tooth, and by changing the swing amount of the differential feed arm alone, the main feed amount by the differential feed tooth Differential adjustment is possible to change larger or smaller than the forward and backward feed amount of the tooth.

This differential adjustment is, for example, in the case of sewing a highly elastic fabric, the amount of feed by the differential feed teeth in front of the needle needle position is larger than the amount of feed by the main feed teeth in the back of the needle needle position, thereby providing a desired feed to the fabric. In the semi-finished state, sew (so-called sew) and sew on the other hand, the sewing amount of the differential feed tooth is made smaller than the feed amount of the main feed tooth, keeping the fabric under tension and sewing (so-called sewn) It is useful for performing proper sewing according to the type of the cloth to be sewn.

To change the swing amount of the differential feed arm for differential adjustment, the slider is slidably installed along the longitudinal direction of the differential feed arm, the slider is connected to the differential feed tooth, and the sliding position of the slider is changed to change the differential feed arm. This is realized by a differential feed mechanism configured to increase or decrease the effective arm length.

The same type of differential feed mechanism is also provided in the longitudinal sewing machine disclosed in the Republic of Korea No. 467155. The differential feed mechanism connects the differential feed teeth and the main feed teeth, which are arranged before and after the needle needle position, through the sliders to the respective feed arms, and change the position of the sliders on the respective feed arms. By this, the feed amount of the main feed tooth and the feed amount of the differential feed tooth are relatively changed to perform differential control.

By the way, in the longitudinal type of sewing machine, a transfer arm (differential feed arm and main feed arm) connected to the sewing machine spindle through an eccentric ring is disposed inside the base of the cylindrical bed protruding from the sewing machine body. There is a problem that it is difficult to provide an operation means for changing the position of the slider mounted on the transfer arm because of insufficient space margin around the arrangement position. Also in the Republic of Korea No. 467155, the existence of the operation means for changing the sliding position of the slider is not disclosed. For example, a part of the cylindrical bed is opened in the vicinity of an arrangement position of the transfer arm, and the opening portion is opened. Although it is possible to change the position of the slider through intervention, in this case, effort is required for differential adjustment by changing the position of the slider, and it is difficult to use it because it is difficult to quickly realize an appropriate differential transportation state corresponding to the type of cloth. It is becoming unavailable.

 SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and enables the adjustment operation of the differential feed mechanism disposed inside the base of the cylindrical bed to be performed from the outside of the sewing machine main body, and promptly performs an appropriate differential transport state corresponding to the type of cloth. In addition, the present invention aims to provide a longitudinal sewing machine that can be reliably realized and that is user friendly.

 The sewing machine which concerns on the 1st invention of this invention is provided with the sewing machine arm and the cylindrical bed which respectively protruded in the direction substantially orthogonal to the said sewing machine main shaft, above and below the sewing machine main body which incorporates a sewing machine main shaft, The main feed teeth and the differential feed teeth arranged and arranged in the axial length direction are conveyed by power transmission from the sewing machine spindle, and are fed to the cloth fed to the beveled position of the tip of the cylindrical bed. In the longitudinal cylindrical sewing machine configured to apply the feed in the direction, it is disposed inside the base of the cylindrical bed in the vicinity of the sewing machine spindle, and the forward and backward operating amount of the differential feed tooth is the forward and backward operating amount of the main feed tooth. And a differential feed mechanism that is variable with respect to the inner side of the sewing machine arm, and swings up and down at approximately the upper portion of the differential feed mechanism. A swinging arm having a tip, a connecting link connecting the tip of the swinging arm and the differential feed mechanism via an inner side of the sewing machine body, and a differential adjustment for swinging the swinging arm by operation outside the sewing body. A means is provided.

In the present invention, the connection passing through the inside of the sewing body to the rocking arm in which the differential feed mechanism disposed inside the tubular bed protruding from one side lower part of the sewing body is disposed inside the sewing arm protruding from the upper part of the sewing body. Connect via a link. The rocking arm is rocked by an operation from the outside of the sewing machine body, and the rocking arm is transmitted to a differential feed mechanism connected by a connecting link to change the amount of feed by the differential feed tooth.

The sewing machine which concerns on the 2nd invention of this invention is a differential feed arm in which the differential feed mechanism in a 1st invention oscillates around the axis which is substantially parallel with the said sewing machine main shaft by the power transmission from the said sewing machine spindle. A slider for sliding according to the differential feed arm, a feed table provided in the axial length direction of the tubular bed with the differential feed teeth at a tip end, and a differential connecting the proximal end of the feed table to the slider; And a conveying link, said connecting link being connected to said slider.

In this invention, in the well-known structure which connects the slider which slides the differential feed mechanism inside the cylindrical bed on the differential feed arm oscillated by the power transmission from a sewing machine spindle, to the feed table of a differential feed tooth. The slider is connected to the rocking arm via a link. By swinging this rocking arm, the sliding position of the slider on the differential feed arm is changed, and the feed amount of the differential feed tooth is increased or decreased.

In the sewing machine according to the third aspect of the present invention, a differential adjusting means according to the first or second invention includes a differential adjusting shaft which penetrates into and out of a side surface of the sewing body, and an outer side of the sewing body of the differential adjusting shaft. A differential adjustment lever fixed to an end of the differential, an differential adjustment arm fixed to an end of the differential control shaft inside the sewing body, a tip of the differential adjustment arm, and And a differential control link connecting the tip of the rocking arm.

In this invention, the differential adjustment lever is arrange | positioned at the side of the sewing machine main body which is easy to operate by a sewing worker, and the operation of this differential adjustment lever is conveyed inside the sewing machine main body by the differential adjustment shaft which penetrates the side of the sewing machine main body. In addition, via the differential control arm and the differential control link to the swing arm inside the sewing arm, and to adjust the differential feed corresponding to the swing of the swing arm.

The purpose and novel features of this invention will become more fully apparent when read in light of the following detailed description in conjunction with the accompanying drawings.

 EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on drawing which shows embodiment.

1 is a perspective view briefly showing the appearance of a sewing machine according to the present invention. The sewing machine according to the present invention protrudes a tubular bed (2) having a diameter of one side lower portion of one side of the sewing machine body (1) placed on the base (10) as shown, It consists of a longitudinal type sewing machine which protrudes the sewing arm 3 so that it may become substantially parallel with the cylindrical bed 2. In FIG.

In the lower part of the inside of the sewing machine main body 1, the sewing machine main shaft 11 is hypothetically orthogonal to the protrusion direction of the cylindrical bed 2 and the sewing arm 3, and the axial length direction. One end of the sewing machine main shaft 11 penetrates the side wall of the sewing machine main body 1 and protrudes to the outside, and the driving pulley 12 is fixed to the protrusion to be disposed at the lower position of the base 10. It connects via the drive belt 13 to the output end of the sewing machine motor which is not shown in figure. By this configuration, the sewing spindle 11 is driven to rotate around the shaft by the rotation of the sewing motor which is transmitted via the driving belt 13 and the driving pulley 12.

The needle plate 20 is provided on the front end surface of the cylindrical bed 2, and the needle plate 20 is formed with a feed tooth hole 21 having an axial length direction of the cylindrical bed 2 in the longitudinal direction. On the other hand, the lower end of the sewing arm 3 is supported by the needle bar 30 and the pressing rod 31, and the needles 32 and 32 are installed at the lower end of the needle bar 30, and the pressing rod 31 At the bottom of the bracket, a pusher 33 is provided.

Sewing by the sewing machine which concerns on this invention comprised as mentioned above clamped the cloth supplied on the needle plate 20 from the front-end | tip of the cylindrical bed 2 with the presser 33 which descends with the presser bar 31. Thereafter, the cloth is fed to the base end of the tubular bed 2 by the following operation of the feed tooth projecting on the needle plate 20 via the feed tooth hole 21, and synchronized with this feed. The needles 32 and 32 are moved up and down together with the needle bar 30, and at the same time, a looper (not shown) is operated at the lower portion of the needle plate 20.

A feature of the sewing machine according to the present invention resides in the configuration of a feed drive system for operating a feed tooth for applying a feed to a cloth on the occasion of sewing as described above. Fig. 2 is a side view showing the configuration of main parts of the feed drive system of the sewing machine according to the present invention, and Fig. 3 is a perspective view briefly showing the connection relation of each part of the feed drive system shown in Fig. 2. In addition, in FIG. 3, the connection part which can rotate relatively is shown by the white circle, and the connection part which can not rotate relatively is shown by the black circle.

In Fig. 2, the outlines of the sewing machine body 1, the cylindrical bed 2 and the sewing arm 3 are indicated by a dashed-dotted line. At the distal end of the cylindrical bed 2, the front feed teeth 4a as differential feed teeth and the rear feed teeth 4b as main feed teeth are arranged in front and rear of the cloth feeding direction. The front feed tooth 4a is fixed to the front end of the front feed table 40, which forms a rod that is extended in the longitudinal direction of the cylindrical bed 2, I) The feed tooth 4b is fixed to the tip of the feed table 41 (see FIG. 3) after being disposed on one side of the previous feed table 40.

The front transfer table 40 is provided with a cutting flaw 42 extending in the longitudinal direction at the proximal end (rear end), and inserted into the cut flaw 42 to be stored and held. By the support shaft 43 of i) 44, it is supported by the inside of the cylindrical bed 2 with the said back feed table 41. As shown in FIG. Moreover, the front conveyance stand 40 is equipped with the long hole 45 in the substantially center of the longitudinal direction, and has the long hole 47 rather than this long hole 45 in the front end side (front side). In the front long hole 47, a square mouth 48 for connecting with the rear feed table 41 is inserted, stored and held. This square ball 48 is a carriage guide (not shown) which swings the support shaft 46 inserted into the central long hole 45 so as to move to a point with a predetermined clearance in the top and bottom and front and rear. It is supported from the rear by the shaft 49 supported by.

According to the above structure, the front conveyance table 40 has rocking motion which has the support shaft 43 of the rear end as a main axis, and the length within the length range of the long holes 45 and 47 of the center and the front end side. You can move back and forth. By the combination of the swing and the forward and backward movement, the front feed tooth 4a at the tip of the front feed table 40 moves along an elliptical trajectory indicated by an arrow symbol in FIG. 2.

In addition, after the transfer tray 41 is provided in the front transfer table 40, the corner hole 44 according to each of the cut | disconnection 42 of the rear end and the front long hole 47 is carried out. , And move back and forth independently of the previous conveyance table 40 by the slide motion of 48, and integrally with the previous conveyance table 40 under the restraint by the corners 44 and 48. Swings. By the operation of the post feed table 41, the post feed teeth 4b fixed to the distal end of the post feed table 41 are separated from the front feed teeth 4a. Synchronized elliptic motion can be performed in the front and back teeth 4a and other back and forth movement strokes.

The up-and-down movement and the forward-backward movement of such a front feed tooth 4a and a back feed tooth 4b are performed using the sewing machine main shaft 11 inside the sewing machine main body 1 as a drive source. A feature of the sewing machine according to the present invention is that the amount of operation is varied with the front and rear motions of the front feed teeth 4a as the differential feed teeth and the front and back motions of the rear feed teeth 4b as the main feed teeth. It is in the configuration of the transfer power transmission system to be adjusted.

In addition, the vertical movement of the front feed tooth 4a and the rear feed tooth 4b causes the rotation of the sewing machine spindle 11 to pass through a known link mechanism (not shown) to the transfer guide. Forward and downward movements of the shaft 49 supported by the front part of the conveyer guide according to the conveyed movement, through the square ball 48, before the conveyer 40 and It is performed by transferring to the post feed table 41.

In FIG. 2, the feed drive system for back and front conveyance is shown. In the inside of the base part of the cylindrical bed 2 as shown in this figure, the front-rear feed shaft 14 is provided horizontally in parallel with the sewing machine main shaft 11. In the middle of this front-rear conveyance shaft 14, the base end of the conveyance arm 15 of a short dimension is fixed and fixed, and the front-end | tip of the said conveyance arm 15 is attached to the corresponding site | part of the sewing machine main shaft 11. As shown in FIG. It is connected to the tip of the transfer rod 17 protruding on the outer circumference of the mounted eccentric ring 16.

With this configuration, when the sewing machine spindle 11 rotates, the transfer rod 17 protruding from the eccentric ring 16 generates a reciprocating movement of a stroke corresponding to the eccentric amount of the eccentric ring 16, and thus the transfer rod 17. The tip of the transfer arm 15 connected to the tip of 17 is pushed. The front and rear conveyance shaft 14 in which the base end of the conveyance arm 15 is fixed and fixed by this pushing can be made to rotate repeatedly by axial center rotation within the angle range corresponding to the said eccentric amount. .

The slider arm (differential feed arm) 50 is attached and fixed to the position different from the said transfer arm 15 in the middle of this front-back conveyance shaft 14. The slider arm 50 holds and holds the slider 51 so as to be slidable in the longitudinal direction, and the slider 51 passes through the differential feed link 52 in the middle portion of the front feed table 40. Is connected.

This configuration causes the slider arm 50 to swing in accordance with the above-described repeated rotation of the front and rear feed shafts 14, and the amount of swing generated at the position of the slider 51 through the differential feed link 52 before ) Can be transmitted to the transfer table 40, so that the previous transfer table 40 and the front transfer tooth 4a fixed to the tip thereof can move back and forth.

The amount of forward and backward operation of the front feed tooth 4a, that is, the front and rear feed amount by the front feed tooth 4a is changed by sliding the slider 51 in accordance with the slider arm 50. As indicated by the solid line in the double, when the slider 51 is positioned at the proximal side of the slider arm 50, it becomes smaller, and as indicated by the dashed-dotted line, on the distal end side of the slider arm 50. It becomes larger when the slider 51 is positioned. In addition, the slider arm 50 has an arc-shaped curved shape centering on the connection position of the differential feed link 52 to the front feed table 40, and the slider 51 is fed to the front feed. It is possible to slide along the slider arm 50 without changing the front and rear positions of the base 40 and the front feed teeth 4a.

On the other hand, as shown in FIG. 3, the rear conveyance stand 41 is fixed to the middle of the front-rear feed shaft 14 in the position different from the said transfer arm 15 and the slider arm 50. It is connected via the connecting link 54 to the tip of the rocking arm 53. With this configuration, the conveyance table 40 and the post feed tooth 4b can be moved back and forth in accordance with the swing of the swinging arm 53 accompanying the repeated rotation of the front and rear feed shaft 14. The operation amount, that is, the front and rear conveyance amount by the rear feed tooth 4b corresponds to the front feed tooth 4a that can be changed as described above in response to the amount of swing of the tip of the swinging arm 53. The differential control between the forward and backward feed amount is possible.

In addition, the front and rear conveyance amount by the front feed tooth 4a and the post feed tooth 4b can be collectively increased and decreased by changing the eccentric amount of the eccentric ring 16. As shown in FIG. The feed adjustment mechanism for this adjustment is a mechanism provided in various sewing machines in order to enable the change of the feed amount corresponding to the cloth used for sewing, and illustration and detailed description are abbreviate | omitted.

As described above, the slider arm (differential feed arm) 50 that swings around the axis of the front and rear feed shaft 14 by the power transmission from the sewing machine spindle 11 and the slider that slides along the slider arm 50. (51) and the front transfer table 40 which is extended in the axial length direction of the tubular bed 2, and engages the front transfer tooth (differential feed tooth) 4a at the tip. And a differential feed mechanism (5) formed by a differential feed link (52) connecting the previous feed table (40) and the slider (51), and the differential feed mechanism (5) is a sewing machine. It is arrange | positioned inside the base part of the cylindrical bed 2 of the main shaft 11 vicinity. In addition, the base part of the cylindrical bed 2 is enlarged compared with the front-end | tip, as shown in FIG. 1, in order to be able to accommodate various mechanisms including the differential feed mechanism 5. As shown in FIG.

On the other hand, the swinging arm 6 which supports the base end by the support shaft 60 which is substantially parallel with the sewing machine main shaft 11 is provided in the upper inside of the sewing machine main body 1 in which the sewing arm 3 protruded. . The tip end of the swinging arm 6 extends inwardly of the sewing arm 3 and is located at an upper position of the differential feed mechanism 5 arranged inside the tubular bed 2, more specifically, the slider arm 50. The leading end of the swinging arm 6 swinging up and down at this position extends to the upper position of the slider 51 sliding along the upper side of the slider 51. 61 is connected to the slider 51. In addition, the connecting link 61 has a curved shape as shown in FIG. 2 to avoid interference with the front wall of the sewing machine main body 1, and the swinging arm 6 also has a curved shape in this manner. Interference with various power transmission mechanisms provided inside the sewing arm 3, such as the power transmission mechanism to the 30, is avoided.

In addition, in the middle part of the sewing machine main body 1, a differential adjustment shaft 70 penetrating the side wall on one side in and out is supported by a rotating material for axial rotation, and on the outside of the sewing machine main body 1, At one end of the differential adjustment shaft 70 that protrudes, a differential adjustment lever 71 is fixed. The front end of the differential adjustment lever 71 is extended forward along the outer surface of the sewing machine body 1, and the differential adjustment shaft 70 is operated by holding the front end and swinging it up and down. ) Can be rotated. In addition, a scale plate 72 is provided on the outer surface of the sewing machine body 1 in addition to the engaging portion of the differential adjustment lever 71. The scale plate 72 is provided with an arc-shaped guide hole 73 for guiding the swing of the differential adjustment lever 71, and is provided on a scale (not shown) formed along the side edge of the guide hole 73. It is comprised so that the swing angle of the differential control lever 71 can be displayed. This differential control lever 71 and the scale plate 72 are also shown in FIG.

In addition, at the other end of the differential adjustment shaft 70 protruding inside the sewing machine body 1, the base portion of the differential adjustment arm 74 is fixedly fixed, and the front end of the differential adjustment arm 74 extends forward. Is connected to the tip of the swing arm 6 via a differential link 75. In addition, the differential adjustment link 75 also has a curved shape shown in Fig. 2, and realizes the connection with the swinging arm 6 to avoid interference with the front wall of the sewing machine main body 1.

By such a differential adjusting shaft 70, a differential adjusting lever 71, a differential adjusting arm 74 and a differential adjusting link 75, a differential adjusting means 7 which can be operated outside the sewing machine main body 1 is provided. Consists of. According to this differential adjusting means 7, the differential adjusting arm 74 swings with the rotation of the differential adjusting shaft 70 by the operation of the differential adjusting lever 71 as the operating end, and this swinging is differentially adjusted. It can be transmitted to the swinging arm 6 through the link 75 so that the swinging arm 6 can swing up and down the support shaft 60 as the main shaft.

In FIG. 2, the state of each part when the operation end of the differential adjustment lever 71 is in the lower position is shown by the solid line, and the case where it is in the same upper position is shown by the dashed-dotted line. When the differential adjustment lever 71 is rocked toward the upper position, the differential adjustment arm 74 swings inside the sewing machine body 1 by the rotation of the differential adjustment shaft 70 accompanying this swing. This oscillation can be transmitted to the tip of the oscillation arm 6 via the differential control link 75 so that the oscillation arm 6 oscillates the support shaft 60 upwardly with the main axis. By this rocking, the linking link 61 connected to the tip of the rocking arm 6 is pulled up, and the force pulled up to the slider 51 connected to the lower end of the linking link 61 is added, and the slider 51 is added. Slides to the upper position along the slider arm 50, and as described above, the amount of forward and backward feed by the front feed teeth 4a is increased. On the contrary, when the differential adjustment lever 71 is rocked toward the lower position, the amount of forward and backward feed by the front feed teeth 4a becomes small.

In this way, a differential adjustment is performed in which the front and rear feed amount by the front feed tooth 4a as the differential feed tooth is changed to be large or small with respect to the front and back feed amount by the post feed tooth 4b as the main feed tooth. can do. In the sewing machine according to the present invention, such differential adjustment can be performed by rocking operation of the differential adjustment lever 71 disposed on the outer surface of the sewing machine main body 1, and an appropriate transport state corresponding to the type of fabric is provided. Can be realized quickly and reliably.

Further, a rocking arm 6 for transmitting the operation of the differential adjusting means 7 to the differential feed mechanism 5 formed inside the base of the cylindrical bed 2 is disposed inside the sewing arm 3, Since the connecting link 61 is disposed inside the sewing machine main body 1 to avoid the inside of the tubular bed 2 having a large spatial constraint, the degree of freedom in design is increased, and the design with a margin is possible. .

In addition, since the tip of the swing arm 6 is positioned at approximately the upper portion of the differential feed mechanism 5, more specifically, at the upper portion of the slider 51 sliding along the slider arm 50, the slider arm The influence on the front-back motion of the front conveyance stand 40 which arises with the fluctuation | variation of 50 can be suppressed slightly. 4A and 4B are explanatory diagrams showing the influence of the tip position of the swinging arm 6 on the front-rear operation of the front feed table 40.

The front carriage 40 is connected to the slider 51 moving along the slider arm 50 via the differential transfer link 52, and the front carriage 40 is connected to the slider 51. ) Will be moved back and forth in the stroke corresponding to the swing amount. On the other hand, the slider 51 is connected to the front end of the swinging arm 6 via the linking link 61, and the swinging of the slider 51 is the center of the front end of the swinging arm 6 of the linking link 61. It occurs according to the arc A whose effective length is a radius.

FIG. 4A shows a case where the tip position of the swinging arm 6 is located approximately at the top of the slider 51, and FIG. 4B shows a position where the tip position of the swinging arm 6 is deviated from the approximately right upper portion of the slider 51. FIG. The case is shown.

As shown, the up and down movement of the slider 51, which is within the range of the swing angle of the slider arm 50 and constrained by the connecting link 61, is mutually opposite to both sides of the center of the swing region in the case of FIG. 4A. In the case of FIG. 4B, they occur in the same direction. Therefore, the vertical movement amount δ of the slider 51 between the swings of the slider arm 50 is located at approximately the top of the differential feed mechanism 5 by placing the tip of the swing arm 6 as shown in FIG. 4A. It can be made small and it becomes possible to make the front-back movement of the front conveyance stand 40 corresponding to the rocking | fluctuation of the slider arm 50 to be performed under substantially the same arm length.

The swinging arm 6 may be disposed, for example, inside the sewing machine body 1, but in the case of adopting this arrangement, the tip of the swinging arm 6 may have a cylindrical bed 2 as shown in FIG. 4B. It is inevitable to deviate from the approximately upper part of the differential feed mechanism 5 located inside the base part, and the conveyance operation | movement of the front feed table 40 and the front feed tooth 4a of the front end is carried out. It is difficult to carry out stably. In the sewing machine which concerns on this invention, the above problem is solved by arrange | positioning the rocking arm 6 inside the sewing arm 3.

In addition, the differential adjustment means 7 should just enable the rocking | arming operation of the rocking arm 6, for example, protrudes the support shaft 60 of the rocking arm 6 to one side of the sewing arm 3; And a configuration other than that shown in the embodiment, such that an operation lever is provided at this protruding end and the oscillation arm 6 is oscillated through the support shaft 60 by the operation of the operation lever. It is also feasible. However, according to the configuration shown in the embodiment in which the differential adjustment lever 71 is provided on the differential adjustment shaft 70 penetrating the side surface of the sewing machine main body 1, the arrangement of the differential adjustment lever 71 as the operation stage is As shown in FIG. 1, it becomes the position which operation is easy for the sewing worker who works facing the tip of the cylindrical bed 2, and there exists an effect that a favorable use situation can be obtained.

Moreover, in the above embodiment, the front feed tooth 4a was made into the differential feed tooth and the rear feed tooth 4b was made into the main feed tooth, but the rear feed tooth 4b was differentially made. It goes without saying that the feed teeth may be used and the previous feed teeth 4a may be used as the main feed teeth.

 As apparent from the above detailed description, in the sewing machine according to the first aspect of the present invention, the swinging of the rocking arm disposed inside the sewing arm is connected to the inside of the tubular bed by a connecting link passing through the inside of the sewing body. Since it is configured to transmit differential control to the differential feed mechanism, it is possible to configure the means for adjusting the differential feed to avoid the inside of the cylindrical bed with a large space constraint. Since it is arrange | positioned in the substantially upper part of a mechanism, the influence which this connection has on a differential feed mechanism can be suppressed slightly and it can be made to perform a stable conveyance operation by the adjusted feed amount.

Further, in the sewing machine according to the second aspect of the present invention, since a general differential feed mechanism for changing the sliding position of the slider on the differential feed arm is employed, the differential adjustment operation from the outside of the sewing machine main body is made simple. A good use situation can be obtained at.

Furthermore, in the sewing machine according to the third aspect of the invention, a sewing operator can make a differential adjustment by operating a differential adjustment lever disposed on the outer side of the sewing machine main body, and sewing on the front end of the cylindrical bed. The present invention exhibits an excellent effect, such that the use situation of is further improved.

 As mentioned above, the embodiment mentioned in the detailed description of the invention is intended to clarify the technical content of the present invention to the last, and the present invention is not construed as being limited only to these specific examples, and the spirit and claims of the present invention It is possible to carry out various modifications within the range.

Claims (3)

 A main feed tooth having a sewing machine arm and a cylindrical bed protruding in a direction substantially orthogonal to the sewing main spindle, and arranged in the axial length direction at the tip of the cylindrical bed; The longitudinal feeder is configured to transfer the differential feed teeth separately by the power transmission from the sewing machine spindle and to apply the feed in the axial length direction to the cloth supplied to the needle position of the tip of the cylindrical bed. In sewing machine, A differential feed mechanism disposed inside the base of the cylindrical bed in the vicinity of the sewing machine main shaft and varying the forward and backward operation amount of the differential feed tooth with respect to the forward and backward operation amount of the main feed tooth; A swinging arm disposed inside the sewing arm, the swinging arm having a tip that swings up and down at an approximately upper portion of the differential feed mechanism; A connecting link connecting the distal end of the swinging arm and the differential transport mechanism via an inside of the sewing body; And a differential adjusting means for swinging the swinging arm by an operation on the outside of the sewing machine main body. The method of claim 1, The differential feed mechanism includes: a differential feed arm oscillating around an axis approximately parallel to the missing spindle by power transmission from the missing spindle; A slider slid according to the differential feed arm; A feeder which is extended in the axial length direction of the tubular bed and has the differential feed teeth at its tip; It is provided with a differential feed link connecting the slider and the base end of the carriage, The connecting link is connected to the slider. The method according to claim 1 or 2, The differential adjusting means includes a differential adjusting shaft penetrating in and out of the side surface of the sewing machine body; A differential adjusting lever fixed to a stepped end outside the sewing body of the differential adjusting shaft; A differential adjusting arm fixed to a speaker end of the differential adjusting shaft inside the sewing body; And a differential control link connecting the tip of the differential arm and the tip of the oscillating arm.

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