KR20140049496A - Multi-thread chain stitch sewing machine with seam ravel preventing apparatus - Google Patents

Abstract

The needle plate base in a double chain stitch sewing machine with a seam loosening device is fixed to the left needle plate base, which supports the swing support shaft of the thread hook, the stopper member, the thread operation air cylinder, and the stopper air cylinder. The right needle plate base is divided into two parts. While the right needle plate base is fixed to the sewing machine bed part, the left needle plate base is attached to the upper surface of the sewing machine bed part through a screw member so as to be fastened, fixed and released. This makes maintenance such as adjustment of the stitch state and replacement of various parts inside the sewing machine bed part very easy and simple without incurring enormous hassle, labor and labor, and the stitch state and predetermined loosening prevention function. Can always be reliably reproduced.

Description

MULTI-THREAD CHAIN STITCH SEWING MACHINE WITH SEAM RAVEL PREVENTING APPARATUS}

The present invention is a sewing machine mainly represented by a transverse double chain stitch sewing machine, for forming a seam of the double chain stitch by the needle and the looper yarn, to prevent the loosening occurs at the end of the stitch of the seam of the double chain stitch A double chain stitch sewing machine with a seam loosening device.

The double chain stitch sewing machine, such as a transverse cylinder type, has one or more needles that rise and fall to maintain the needle, and a looper that moves and retreats in a direction substantially perpendicular to the vertical movement path of the needles by maintaining the looper yarns. Sedimentation loops formed by needles underneath the needle plate are captured by the looper's advancement operation, and the looper yarns held by the looper are interlooped by the third party to form seams of double chain stitches on the sewing fabric. It is a sewing machine.

If the seam of the general double chain stitch formed by the double chain stitch sewing machine is pulled in the direction indicated by the arrow in FIG. 20 when the end of the cut loop yarn 10 cut when the stitch is finished as shown in FIG. The persa 10 exits from the final acupuncture loops 20a and 20b formed by the needles 20 and 20, and the escaped yarns easily spread out toward the stitch start side, and as a result, loosening occurs in the entire seam. I have a problem.

This loosening occurs likewise in the seams of double chain stitches formed by one needle or two or more needles and looper yarns.

For the purpose of preventing seam peculiar loosening formed by the double chain stitch sewing machine as described above, the applicant has already developed and patented the double chain stitch sewing machine having the anti-loosening device as described below ( This is hereinafter referred to as an existing patent application technology by the present applicant).

The seam loosening prevention device of the double-chain stitch sewing machine (here, the two-erosion sewing machine will be described) of the present patent application according to the present applicant holds the needles 20 and 20 as shown in Figs. The needles 2 and 2 (refer to FIGS. 11 to 17) and the looper yarn 10 which move up and down with respect to the needle drop positions A and A set at intervals in the left and right direction at approximately the center of the needle plate P It is possible to move forward and backward in the arrangement direction of the needle drop position (A, A), and the looper (1) (FIGS. 11 to 17) to capture the needle loops (20a, 20b) formed under the needle plate (P) at the time of advancement. Reference) and the looper 1 can be approached and separated, and as shown in FIG. 21, the standby position away from the looper 1, and the thread hook approaching the looper 1 as shown in FIG. In the plane approximately parallel to the needle plate (P) around the support shaft 30 in the vertical direction across the position A thread-operating air cylinder (including a thread-operating cylinder hereinafter) 32 as a hook actuator for driving and swinging the threading hook 3 and the threading hook 3 to the standby position and the threading position. And the needle loops 20a and 20b disposed at a position farther from the needle plate P than the threading hook 3 and captured by the threading hook 3 at the threading position between the threading position and the standby position. In order to keep it in the position, the rocking lever 9 and the stopper lever 4 and the stopper lever 4 which rock about the up-and-down support shaft 90 in the surface substantially parallel to the needle plate P, A stopper air cylinder (hereinafter referred to as a stopper cylinder) 42 as a stopper actuator for driving and swinging from an engagement position engaged with a part of the swing lever 9 to a retracted position away from the engagement position; Threading Hooks (3) The connecting rod 35 linking the swing lever 9 and the thread manipulation cylinder 32 and the stopper cylinder 42 are selectively operated and controlled after the normal sewing is finished, so that the thread hooking hook 3 It is comprised by the control part 8 (refer FIG. 8) which hold | maintains one needle thread loop 20b captured at the threading position in the said holding position, and maintains this state and makes sewing operation for at least 1 needle. have.

In addition, in the anti-loosening device of the double-chain stitch sewing machine of the present patent application by the present applicant, the same or corresponding constituent member in the anti-loosening device described as an embodiment of the present invention described later and a constituent part And constituent parts are given the same reference numerals as those used in the embodiment of the present invention, and their detailed description is omitted.

According to the patent application described by the present applicant described above, after the normal sewing is finished, the operation of the thread hooking hook 3, the stopper lever 4, and the swing lever 9 is controlled through the control unit to control the above-described operation. As shown in Fig. 18, the looper yarn 10 is formed on the back side of the sewing cloth at the end of the seam M of the double chain stitch by the same sewing operation for the same needle (left in Fig. 18). Position passing through the inside of the final submerged loop 20a, folded back in front of the sedimentation 20 which exits to the back side of the sewing cloth during sewing of one needle for preventing loosening, and passed through the inside of the right final submerged loop 20a. Is cut off. On the other hand, the needle tip 20 of the left side (the right side in FIG. 18) which exits to the back side of the sewing cloth at the time of sewing for one needle is usually in the final needle loop 20b formed at the back side of the sewing cloth at the end of sewing. Pass through and self loop the final settling loop 20b to form a seam of a single chain stitch. Thereby, as shown in FIG. 18, the looper yarn 10 will be in the state pressed between the left needle 20 and the left final needle loop 20b.

In FIG. 18, the left end of the final needle loop 20b and the needle 20 are shown in a loose state in order to specify the entanglement of the needle 20, but the actual left needle of the final needle 20 20b after the needle 20 has passed through FIG. As shown in FIG. 3, the state is similar to that of the final immersion loop 20a on the right side. The looper yarn 10 is firmly pressed between the needle tip 20 and the final needle loop 20b on the left side, and spans between the final needle loop 20 on the left side and the needle needle loop 20c on the left side formed once before. Is constrained. As shown in Fig. 19, this restraint is maintained even when a force from any direction acts on the looper yarn 10, so that the unique loosening can be prevented from occurring in the seam M of the double chain stitch. .

As described above, the double chain stitch sewing machine having the seam loosening prevention device according to the patent application technology according to the present applicant can effectively prevent the occurrence of peculiar loosening of the seam of the double chain stitch. However, in the double chain stitch sewing machine having the anti-loosening device according to the aforementioned patent application technology by the present applicant, the following problems to be improved remain.

That is, in the prior patent application technology by the present applicant, as shown in FIGS. 21-23, the thread catching hook 3, the stopper lever 4, and the oscillation lever 9 which make a seam loosening | blocking apparatus a component. The needle operating cylinder 32 and the stopper cylinder 42 were supported by a single long needle plate base 11 that was long and large in the horizontal direction fixed with the needle plate P and fixed to the upper surface of the sewing machine bed part. Specifically, the support shaft 30 for swinging of the thread latching lever 3 is supported at a position near the rear side of the needle plate P at the left portion of the needle plate base 11. On the other hand, the stopper lever 4, the oscillation lever 9, the seal operation cylinder 32, and the stopper cylinder 42 are supported at the position away from the needle plate P at the right side of the needle plate base 11, and also the swing lever The connecting rod 35 is connected between the distal end of (9) and the distal end of the extension installation part 3c which is extended so as to be folded forward from the swing support shaft 30 of the thread hooking hook 3. It was adopted. In addition, 6 in FIGS. 21-23 is the looper yarn holding body fastened and fixed together by the thread hooking hook 3 via the fixing screw 60,60.

As described above, in the double-chain stitch sewing machine according to the present patent application technique of the present applicant, all the components in the seam loosening apparatus were supported on a single needle plate base 11 that was long and large in the horizontal direction. Therefore, after attaching the needle plate base 11 to which the structural members of the anti-loosening device is mounted and attached to the upper surface of the sewing machine bed portion, for example, in the lower part of the needle plate base 11 such as a looper or an operation member of the looper, etc. When it is necessary to adjust the stitch state by modifying the position or motion trajectory of the members constituting the stitches accommodated in the sewing machine bed part, or to perform maintenance such as replacing various parts incorporated in the sewing machine bed part. By removing the needle plate P alone, the working space of a sufficient area for adjustment or maintenance cannot be secured. Therefore, in order to secure a wide working space, the whole of the long and large needle plate base 11 is once separated from the sewing machine bed part to perform a predetermined adjustment or maintenance, and when it is finished, the whole of the long and large needle plate base 11 is again sewn. Work that requires labor to attach to the bed is forced.

In particular, the seal operation cylinder 32 and the stopper cylinder 42 are connected with air tubes 33 and 43 for supplying working air to these cylinders 32 and 42, and when the needle plate base 11 is separated and When attaching, the air tubes 33 and 43 are pulled out of the inside of the sewing machine bed part so as not to interfere with the work, and after the work, it is very troublesome and laborious to push it back into the inside of the sewing machine bed part. In addition, if such troublesome and troublesome adjustment or maintenance work is not performed, there is a possibility that a deterioration of the stitch state may occur or a predetermined anti-loosening function may not be reproduced. Therefore, as mentioned above, work which is very troublesome and labor and labor is inevitable as mentioned above, and the subject which should be improved in this point was left.

Japanese Patent Application 2011-016821 Japanese Patent Application 2011-115174

This invention is made | formed in view of the above-mentioned situation, and can effectively prevent generation | occurrence | production of peculiar loosening of the seam of a double-chain stitch, of course, adjustment of the stitch state by correction of the position of the member which comprises a stitch, Maintenance such as the replacement of various parts housed inside the sewing machine bed part can be performed very easily and simply without incurring a great deal of labor, labor and labor, and can reliably reproduce the stitch state and the predetermined anti-loosening function at all times. An object of the present invention is to provide a double chain stitch sewing machine with a seam loosening device.

In order to achieve the above object, the double-chain stitch sewing machine having an anti-seam device according to the present invention, the needle and the vertical movement to maintain the needle, and the looper to maintain the direction perpendicular to the vertical movement path of the needle It is possible to move forward and backward, and has a looper for capturing the needle loop formed under the needle plate during the advancement operation, and a needle plate base attached to the needle plate, and attached to the upper surface of the sewing machine bed, the needle is the needle plate A double chain stitch sewing machine which forms a seam of a double chain stitch on a sewing fabric by capturing a sediment loop formed below by the looper and looping the needle with a looper yarn held by the looper to form a third chain stitch. Ivan operation is possible, the standby position away from the looper and the threading position approaching the looper An acupuncture retaining mechanism having a thread catching hook that oscillates in a plane approximately parallel to the needle plate about a support shaft in the up and down direction, and a hook actuator that drives the thread catching hook to the standby position and the thread catching position; The thread is disposed at a position farther from the needle plate than the thread hook of the needle holding mechanism, so that the needle loop is held at the holding position between the thread hook position and the standby position by the thread hook hook captured at the thread hook position. A stopper mechanism having a stopper member capable of temporarily stopping and releasing the swing from the threading position of the hooking hook to the standby position, and a stopper actuator responsible for stopping and releasing the stopper member, and threading of the needle holding mechanism. A connecting member for linking the hook and the stopper member of the stopper mechanism; After the sewing is finished, the looper advances and the threading hook of the needle holding mechanism is moved close to the looper to move the needle loop loop captured at the threading position to the holding position. And a control unit for controlling the needle holding mechanism and the stopper mechanism in association with the vertical movement of the needle, the retraction operation of the looper, and the transfer operation of the sewing cloth so as to maintain the state and perform at least one sewing operation. In the double chain stitch sewing machine with seam loosening device,

The needle plate base is divided into two parts: a left needle plate base to which the needle plate is attached, and which supports the swing support shaft of the hanging hook, and a right needle plate base to fix the stopper member, the hook actuator and the stopper actuator, and to the right side. The needle plate base is fixed to the sewing machine bed part, and the left needle plate base is attached to the upper surface of the sewing machine bed part via a screw member so as to be fastened, fixed and released.

According to the double-chain stitch sewing machine with a seam loosening device according to the present invention having the above-described feature configuration, after the normal sewing, the looper advances and the thread hook of the needle holding mechanism is attached to the looper. Approaching, moving the needle loop loop captured by this looper to the holding position, and maintaining this state to perform at least one needle sewing operation. By pressing the looper yarn with the roofing part of the company, the release of the looper yarn can be prevented, and the loosening of the seam can be reliably prevented at the generation stage.

In addition, in the present invention, the needle plate base attached to the sewing machine bed portion attaches the needle plate, and further includes a left needle plate base for swingably supporting the thread hook of the needle holding mechanism, and a stopper member, a hook actuator, and a stopper of the stopper mechanism. Since it is divided into two parts by the right needle plate base which fixes and supports an actuator, and these two divided left and right needle plate bases are separately attached to a sewing machine bed part, it is possible to attach an anti-loosening device to a sewing machine bed part, As with the patent application filed by the applicant, compared with the case of handling one long and large needle plate base, the attachment (mounting) operation of the entire anti-loosening device to the sewing machine bed portion can be performed comfortably with less labor.

In addition, after it is once attached to the sewing machine bed part, for example, the position or motion trajectory of the members constituting the stitches accommodated inside the sewing machine bed part at the lower part of the needle plate base such as a looper or a looper operation member is corrected to correct the stitch state. When adjustment is necessary, or when maintenance such as maintenance or replacement of various parts contained in the sewing machine bed part is necessary at the lower part of the needle plate base, hook actuators and stoppers to which air tubes or power supply lines are connected. It is not necessary to separate each of the right needle plate bases fixedly supporting the actuator from the sewing machine bed portion, and only a left needle plate base can be secured and separated from the sewing machine bed portion to secure a sufficiently wide working space.

Therefore, maintenance of the adjustment of the stitch state, maintenance and replacement of various parts contained in the sewing machine bed part, and the handling of only the left needle plate base where the air tube and the power supply line are not entangled are enormously cumbersome and labor. And it can be performed very easily, simply, and workability without the trouble. This brings about the effect that a good stitch state and a predetermined loosening prevention function can be exhibited with good reproducibility at all times, and have succeeded in solving the problem left by the previous patent application technology by this applicant.

In a double chain stitch sewing machine having a seam loosening device according to the present invention, the stopper mechanism includes a stopper member which is directly connected to the hook actuator and linearly reciprocates, and a swing that can be engaged and released by a part of the stopper member. A lever, a spring for rocking and urging the rocking lever in a direction in which the threading hook is in the standby position, and the stopper actuator for releasing the rocking lever from a part of the stopper member in response to an urging force of the spring. It is preferable that it is comprised.

In this case, since the movement in the return direction of the stopper member (the movement in the direction in which the thread hook is located in the standby position) is performed by the pressing force of the spring, the swing lever for engaging and releasing engagement with a part of the stopper member is operated. As a stopper actuator to be made, it is preferable that the stopper member can be driven by extrusion. Therefore, when using an air cylinder as a stopper actuator, since a unidirectional-type air cylinder can be used, size reduction and cost reduction of a stopper actuator can be aimed at.

Moreover, in the double chain stitch sewing machine which has the seam loosening prevention device which concerns on this invention, it is preferable that the rocking lever in the said stopper mechanism is attached to the movable table attached so that left-right position adjustment is possible to the said right needle base.

In this case, simply and appropriately adjust the timing of the looper exiting from the needle loop held in the threading hook to ensure self-looping to prevent seam loosening by positioning the movable table left and right relative to the right needle plate base. Can be.

Further, in the double chain stitch sewing machine having a seam loosening device according to the present invention, the hook actuator of the needle holding mechanism and the stopper actuator of the stopper mechanism are fixedly supported on the lower surface of the right needle plate base in a state of overlapping two stages up and down. It is preferable that it is done.

In this case, since the two actuators are fixedly supported on the right needle plate base in the state of overlapping two-stage up and down, the two actuators are arranged (juxtaposed) in positions apart from each other, as in the patent application described by the present applicant. Compared with the case, the plane space occupied by the actuator can be reduced and compacted, so that the inside of the sewing machine bed portion can be accommodated better.

In addition, in the double chain stitch sewing machine having a seam loosening device according to the present invention, in the thread hook of the needle holding mechanism, the support is held between the thread hooking position, the holding position, and the standby position together with the thread hooking hook. It is preferable to attach the looper yarn holder which keeps the looper yarn extended from the said looper to sewing cloth by the front side rather than the lowered position of the said needle by rocking the surface substantially parallel to the needle plate about the axis.

In this case, by holding the looper yarn at the position of the front side rather than the lowered position of the needle by the looper yarn holder operating together with the thread hook, the looper yarn can be reliably positioned together with the needle thread while being a simple configuration. Therefore, the company's roofing can be performed reliably, and the seam can be prevented even more reliably.

In addition, in the double chain stitch sewing machine having a seam loosening device according to the present invention, it is preferable that the looper yarn holder is attached to the threading hook so as to be adjustable in position.

In this case, it is possible to appropriately set the relative positions of the sedimentation and looper yarns, and the roofing can be performed more reliably to further enhance the seam loosening effect.

Moreover, in the double chain stitch sewing machine with the seam loosening | blocking apparatus which concerns on this invention, it is preferable that the hook actuator of the said needle keeping mechanism, and the stopper actuator of the said stopper mechanism are both air cylinders.

In this case, it is possible to operate the threading hook of the needle holding mechanism and the swinging lever of the stopper mechanism in a responsive manner based on a control signal from the control unit, thereby ensuring a seam loosening action after normal sewing. And can be carried out efficiently.

Moreover, you may use an electromagnetic solenoid as these actuators.

In addition, in the double-chain stitch sewing machine having a seam loosening device according to the present invention, the pin is protruded upward in the connecting end portion of the connecting member, and the upper end of the pin at the connecting end portion of the thread hooking hook. It is preferable that the connection hole which can be inserted into this pin and escapes upward from this pin is formed.

In this case, the left needle plate base is released from the upper surface of the sewing machine bed and separated from the upper side of the sewing machine bed in order to adjust the stitch state and maintain or replace various parts contained in the sewing machine bed. At the time, the thread hook does not need any troublesome operation such as loosening the screw for connection of the connection member and the thread hook, or removing the pin for connection, or simply lifting the left needle plate base upward. It is possible to disconnect the connection member with the. In addition, after the adjustment and maintenance described above, only the left needle plate base is fixed and attached to the sewing machine bed portion from above, and the threading hook and the connecting member can be returned to the connected state. Thereby, the trouble of the adjustment and maintenance mentioned above can be simplified further.

Further, in the double chain stitch sewing machine having a seam loosening prevention device according to the present invention, the left needle plate base or the sewing machine bed portion has a left needle plate base at a plurality of places separated from the plurality of fixed connection and disconnection points by the screw member. It is preferable that the knock pin which can be positioned with respect to the sewing machine bed part protrudes, and a pin hole that can be fitted to the knock pin is formed in the sewing machine bed part or the left needle plate base.

In this case, when the left needle plate base is attached to and detached from the sewing machine bed portion, the left needle plate base can be reliably positioned at a predetermined position of the sewing machine bed portion by fitting a plurality of knock pins and pin holes. Therefore, even if the left needle plate base is repeatedly attached to and detached from the sewing machine bed portion for each of the above-described adjustments and maintenances, the left needle plate base can always be secured to a predetermined position and posture and attached to the sewing machine bed portion. Thereby, a seam loosening prevention function can always be appropriately and reliably performed normally as well as sewing.

Further, the seam loosening prevention device in the present invention can be suitably applied to the case where the cross-sectional double chain stitch sewing machine is the target.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an overall external perspective view of a transverse double chain stitch sewing machine having a seam loosening device according to an embodiment of the present invention.
It is a perspective view which shows the structure of the principal part of the seam loosening | blocking apparatus in the said transverse type double chain stitch sewing machine.
It is a perspective view which shows the state which removed a part of structure of the principal part of the said seam loosening prevention apparatus.
It is a top view which shows the structure of the principal part of the said seam loosening apparatus.
It is a bottom view of the principal part explaining the structure and 1st operation | movement of the stopper mechanism of the said seam loosening | blocking apparatus.
6 is a bottom view of a main portion for explaining a configuration and a second operation of the stopper mechanism.
7 is a bottom view of a main part for explaining the configuration and the third operation of the stopper mechanism.
8 is a bottom view of a main portion for explaining a configuration and a fourth operation of the stopper mechanism.
9 is a block diagram showing a configuration of a control system of a transverse double-chain stitch sewing machine including the seam loosening prevention device.
10 is a time chart illustrating the operation contents of the control unit in the seam loosening prevention device.
It is explanatory drawing of the 1st loosening prevention operation | movement by the said seam loosening prevention apparatus.
It is explanatory drawing of the 2nd loosening prevention operation | movement by the said seam loosening prevention apparatus.
It is explanatory drawing of the 3rd loosening prevention operation | movement by the said seam loosening prevention apparatus.
It is explanatory drawing of the 4th loosening prevention | movement operation by the said seam loosening prevention apparatus.
15 is an explanatory view of a fifth loosening prevention operation by the seam loosening prevention apparatus.
It is explanatory drawing of the 6th loosening prevention operation | movement by the said seam loosening prevention apparatus.
It is explanatory drawing of the 7th loosening prevention operation | movement by the said seam loosening prevention apparatus.
It is the figure which looked at the seam structure of the 2-erosion double chain stitch obtained by this invention from the back side of sewing cloth.
It is explanatory drawing of the anti-loosening effect of the seam structure shown in FIG.
Fig. 20 is a view of the general seam structure at the end of the stitch seen from the back side of the sewing cloth.
It is a top view which shows roughly the structure of the principal part of the seam loosening prevention apparatus in previous patent application technology by this applicant.
It is a bottom view which shows roughly the structure of the principal part of the seam loosening prevention apparatus in the patent application technique by the said applicant.
It is a top view explaining the operation state of the principal part of the seam loosening prevention apparatus in the patent application technique by the said applicant.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing.

1 is a perspective view of an overall appearance of a transverse double chain stitch sewing machine according to an embodiment of the present invention, Figures 2 and 3 is a configuration of the main portion of the seam loosening device equipped with a transverse double chain stitch sewing machine according to the present invention 4 is a plan view showing a configuration of main parts of the seam loosening prevention device. In addition, in the following description, it demonstrates using the expression "left, right" and "before and after" shown by the arrow in FIGS. Here, "before" is a side close to a sewing worker, "after" is a side away from a sewing worker, and "left, right" is "left, right" when it sees from the front side near a sewing worker.

In addition, in this embodiment, the same code | symbol is attached | subjected to the structural member and component part which are the same as or correspond to the patent application technique by this applicant demonstrated based on FIGS. 21-23.

As shown in FIG. 1, in the transverse double-chain stitch sewing machine according to the embodiment of the present invention, the sewing machine arm portion C and the sewing machine bed portion B are substantially parallel to each other from the upper and lower positions of the sewing machine body portion D toward the left side. It extends in a shape. As shown in Fig. 4, the transverse double chain stitch sewing machine includes a looper 1, two needles 2 and 2 (see Figs. 11 to 17), and a needle plate attached to the upper surface of the sewing machine bed portion B. The base 11, the seam loosening prevention device H equipped with this needle plate base 11, and the needle plate P attached to the said needle plate base 11 are provided. The needles 2 and 2 are raised and lowered through the operation of the needle bar drive mechanism. A and A in FIG. 2, FIG. 4 have shown the needle dropping position (falling position) of the needles 2 and 2. As shown in FIG. The needle drop positions A and A are set at intervals in the left and right directions at approximately the center of the needle plate P. FIG.

The looper 1 moves back and forth (left advance and right retreat) in the direction of the arrangement of the needles 2 and 2 (needle drop positions A and A) through the operation of the looper driving mechanism. 4 shows the state in which the looper 1 operated to the left advancement position, and the broken line in FIG. 4 shows the state in which the looper 1 operated to the right retreat position. As shown by the solid line of FIG. 4, the front-end | tip part of the looper 1 in a left advancement position extends to the left direction beyond needle drop position A and A, and is shown to the right retracted position as shown with the broken line in FIG. The tip end of the looper 1 which is present is located away from the needle dropping positions A and A in the right direction.

The transverse double chain stitch sewing machine uses the sewing fabric (not shown) set on the needle plate P by the raising and lowering operation of the needles 2 and 2 and the left advance and right evacuation of the looper 1. Sewing. The sewed cloth is pressed by a presser (not shown) on the needle plate P and moved in the direction of arrow Y in Fig. 4 by the operation of the feeding mechanism provided inside the sewing machine bed B. The feed mechanism is provided with a feed tooth which protrudes on the needle plate P and moves in the rearward direction and which is immersed below the needle plate P and repeats an operation of moving backward in the forward direction. Is intermittently moved in the direction of arrow Y.

The needle bar drive mechanism, the looper drive mechanism, and the transfer mechanism described above are known mechanisms that operate in synchronization with each other by transmission from a sewing machine spindle (not shown). The needles 2 and 2 respectively hold the needles 20 and 20 (see Figs. 11 to 17) separately, and penetrate the sewing cloth under the needle plate P while the sewing cloth stops the transfer movement. Early, it rises and exits above the sewing fabric. The looper 1 holds the looper yarn 10 (see FIGS. 11 to 17), advances to the left to coincide with the start of the rising of the needles 2 and 2, and the needles 20 and 20 formed under the needle plate P. ) Loops 20a and 20b. The sewing cloth is conveyed and moved when the needles 2 and 2 are raised. The needles 2 and 2 descend through the sewing cloth which has been transported, and capture the looper yarn 10 held by the looper 1 in the right retreat. The double chain stitch sewing machine repeats the above operation to form seams of the double chain stitch on the sewing cloth.

The seam loosening prevention device H provided in the above-described transverse double chain stitch sewing machine includes a needle holding mechanism, a stopper mechanism, a thread hook 3 (to be described later) of the needle holding mechanism, and the stopper mechanism. A connecting rod 35 as a connecting member for interlockingly connecting the stopper member 4 (to be described later) and a control unit 8 (to be described later) are provided.

The needle holding mechanism is a support shaft in the vertical direction between the threading hook 3 and a threading position in which the threading hook 3 is moved away from the looper 1 and a threading position approaching the looper 1. A reciprocating seal operation cylinder 32 as a hook actuator for driving swinging around 30 is provided. The supporting shaft 30 serving as the swing center of the thread hooking hook 3 is disposed in the vicinity of the right rear corner portion of the needle plate P and is supported on the needle plate base 11. [

The thread hooking hook 3 has an arcuate curved shape and is connected to the front end portion of the support arm 3e extending to the left from the support shaft 30 so as to be forwardly and backwardly engaged. The distal end of the thread hooking hook 3 faces the needle dropping positions A and A from the left rear at the lower side of the needle plate P. The hook part 3b which protrudes outward is formed in the front-end | tip part of the thread hooking hook 3. As shown in FIG. The support arm 3e has an extension portion 3c extending forward from the support shaft 30. One end of the connection rod 35 is connected to the distal end portion of the extension portion 3c.

As shown in FIG. 4, the looper yarn holding body 6 which has the shape curved in circular arc shape is fastened together by two fixing screws 60 and 60 at the base of the said thread hook hook 3, and is fixed. . The tip end portion of the looper yarn holder 6 extends forward along the left side of the thread hook 3 and faces the needle drop positions A and A at the front position of the tip end of the thread hook 3. . At the distal end of the looper yarn holder 6, a looper yarn receiving portion 6a bifurcated is formed. The looper holder 6 can be adjusted in position with respect to the thread hook 3 by loosening the fixing screws 60 and 60, and by this position adjustment, the looper thread by the looper thread receiving portion 6a at the tip. It is comprised so that maintenance of (10) may be ensured.

5 to 8, the stopper mechanism is fixed to the distal end portion (left end portion) of the output rod 31 of the yarn handling cylinder 32 through a fixing screw 36, A stopper member 4 linearly reciprocatingly moved in the left and right direction by the expansion and contraction operation of the actual operation cylinder 32 by the supplied operating air, A spring 91 for swinging the swinging lever 9 in a direction in which the threading hook 3 is positioned at the standby position by engaging the swinging lever 9 with a part of the stopper member 4, (Pushing drive type in the left direction) stopper cylinder 42 as a stopper actuator for forcibly releasing the pivotal lever 9 from a part of the stopper member 4 against the pivoting pressing force of the stopper member 91, Constituted by .

The output rod 41 of the stopper cylinder 42 is pushed by the operating air supplied through the air tube 43 to push the stopper cylinder 42 in the left direction, Counterclockwise against the pivotal pressing force of the pivot 91.

The rocking lever 9 is supported on the upper surface of the rocking lever mounting table (moving table) 92 so as to be pivotable around the support shaft 90 in the vertical direction. The swing lever 9 has an engaging claw 9a that can be engaged with a part of the stopper member 4 at its distal end. As shown in FIG. 5, when the stopper member 4 is driven in the left direction by the stretching operation of the thread operating cylinder 32, that is, when the thread hooking hook 3 is moved to the standby position. When the stopper member 4 is brought into contact with the side of the stopper member 4 by the pressing force of the spring 91, and the stopper member 4 is driven in the right direction by the contracting operation of the seal operation cylinder 32, it is shown in FIG. As described above, the pressing claw 9a swings around the support shaft 90 in the clockwise direction so that the engaging claw 9a at the tip is engaged with a part of the stopper member 4.

In addition, as shown in FIG. 7, the engagement claw 9a at the tip of the swing lever 9 is engaged with a part of the stopper member 4 by extending the contracted seal operation cylinder 32 only a small amount. The driving movement of the stopper member 4 in the left direction is temporarily stopped. In this way, in the state in which the stopper member 4 is temporarily stopped, the threading hook 3 moves to the holding position between the standby position and the threading position via the connecting rod 35 and stops. At this time, the hook part 3b of the front end of the thread hooking hook 3 is the left side of the needle dropping position A on the left side from the thread hooking position (between left and right needle dropping positions A and A) shown in FIG. It moves backward and hangs the needle 20 of the left side, and it hold | maintains in the said holding position. Moreover, the looper yarn holder 6 advances to the front side of the looper 1, and the looper yarn receiving portion 6a at the tip holds the looper yarn 10 in front of the needle drop position A on the left side.

As shown in FIG. 8, the rocking lever 9 is resisted to the rocking force of the spring 91 by extruding and driving the output rod 41 to the left in accordance with the elongation of the stopper cylinder 42. It swings counterclockwise. According to this swing, the engaging claw 9a at the tip of the swing lever 9 is released from a part of the stopper member 4, and the temporary stop of the stopper member 4 is released. As a result, the thread operation cylinder 32 is extended and operated to the maximum, and the thread hooking hook 3 and the looper yarn holder 6 are swinged and returned to the standby position via the connecting rod 35.

As described above, in the present embodiment, the thread hooking hook 3 and the looper yarn holding member 6 of the needle holding mechanism are described above by the expansion and contraction operation of the yarn operating cylinder 32 and the stopper cylinder 42. It swings between the standby position, the threading position and the holding position.

Moreover, the transverse cylindrical double chain stitch sewing machine in this embodiment is equipped with the thread cutting mechanism 5 which cuts the needle needle 20 and the looper yarn 10 after completion of sewing. As shown in FIG. 16 and FIG. 17, this thread cutting mechanism 5 has the thread cutting hook 50, the thread cutting blade 51, and the thread cutting hook 50 in the sliding contact part with the thread cutting blade 51. FIG. It has a pressing leaf spring 59 and a thread cutting actuator 58 (refer FIG. 9). The thread cutting hook 50 has a first hook portion 52 and a second hook portion 53 projecting rearward from the tip end thereof. Since the yarn cutting mechanism 5 is a known one, the description and illustration of other detailed configurations are omitted.

9 is a block diagram showing a configuration of a control system of a transverse double-chain stitch sewing machine including the seam loosening prevention device H as described above.

The control unit 8 of the double-chain stitch sewing machine includes a foot signal 21a and a foot release signal 21b by the pedal switch 21, and a needle position signal transmitted when the needles 2 and 2 are in the vicinity of the top dead center. 22 and the thread cutting signal 23 and the needle wipe signal 24 are input, respectively.

On the other hand, the control unit 8 outputs an operation control signal to each of the actual operation cylinder 32, the stopper cylinder 42, and the chamber cut actuator 58. The thread hooking hook 3 and the looper yarn holder 6 operate as described above in accordance with an operation control signal output from the control unit 8 to the thread operation cylinder 32 and the stopper cylinder 42, and thus cut the thread. The thread cutting actuator 58 of the mechanism (not shown) expands and contracts in accordance with the thread cutting signal 23 output from the control unit 8, respectively.

In addition, the control unit 8, the air source for throwing up the sewing machine motor 80, which is the driving source of the sewing machine main shaft, the cloth pressing cylinder 81 for raising and lowering the cloth presser, and the cut needles 20 and 20, which will be described later. An operation control signal is also output to the wiper 82, the transfer reduction mechanism 83 for adjusting the transfer amount of the sewing cloth, and the looper yarn suppression mechanism 84 for suppressing the feeding of the looper yarn 10 to the looper 1, respectively. .

The feed reduction mechanism 83 changes the operation aspect of the feed tooth in the feed mechanism, for example, by inclining the feed path of the feed tooth with respect to the needle plate P to shorten the projection time onto the needle plate P. By shortening the time for which the feed tooth acts on the sewing cloth on the needle plate P, or by changing the length of the lever that circulates the feed tooth, the unit feed pitch by the feed tooth is reduced to reduce the feed amount of the sewing cloth. It is. Since the conveyance reduction mechanism 83 is well-known, detailed illustration and description are abbreviate | omitted.

The looper yarn suppressing mechanism 84 includes a seal tension disk for clamping the intermediate portion of the looper yarn 10 to be transported to the looper 1, and an actuator that operates to increase or decrease the looper yarn clamping strength by the seal tension disk. have. The looper yarn suppression mechanism 84 is known because the looper yarn clamping strength by the tension tension disk is increased to add the imparting resistance to the looper yarn 10 to suppress the feeding of the looper yarn 10. Illustration and description are omitted.

The control section 8, after the end of the sewing to form the seam of the double chain stitch, the sewing hook 3 and the looper yarn retainer 6 sewing machine motor 80, cloth pressing cylinder 81, air wiper 82 By operating in conjunction with the feed reduction mechanism 83 and the looper yarn suppressing mechanism 84, the seam loosening prevention operation of the double chain stitch is executed.

10 is a time chart showing the operation contents of the control unit 8 for preventing loosening in a time-wise manner. The control unit 8 is a computer having a CPU, a ROM, and a RAM, and the anti-loosening operation according to the time chart of FIG. 10 is executed by a series of operations of the CPU according to the control program stored in the ROM.

11-17 is explanatory drawing of the anti-loosening operation | movement by the anti-loosening apparatus H in the transverse double chain stitch sewing machine of this invention, and it generate | occur | produced by the operation of the control part 8 according to the time chart of FIG. The operating states of the thread hook 3, the looper yarn holder 6, and the thread cutting hook are shown.

The sewing worker using the sewing machine stops the pedaling operation of the pedal for driving the sewing machine when the normal sewing is finished, and then performs the loosening prevention operation. In this case, the pedal is operated to release the foot. The pedal switch 21 is attached to the pedal and outputs a stepping signal 21a during a stepping operation and outputs a stepping-off signal 21b when a stepping operation is performed.

The control unit 8 stops the sewing operation when the normal sewing is finished and the pedal for driving the sewing machine is returned from the depressed state to the neutral state, And outputs the stop command to the sewing machine motor 80 with reference to the needle position signal 22 given to the input side when both the release signal and the release signal 21b are not outputted. Thereby, the sewing machine temporarily stops in the state where the needles 2 and 2 are in the top dead center vicinity and the looper 1 advances to the left.

Thereafter, the control unit 8 waits until it becomes an operation to release the foot from the pedal. When the foot release operation is performed at the time of S2 in FIG. 10, and the foot release signal 21b is input to the input side, the controller 8 starts the anti-loosening operation described below. Further, when the pedal switch 21 is re-inputted from the pedal switch 21, the control unit 8 returns to the normal sewing operation, so that the sewing worker can continue normal sewing by operating the pedal again.

In Fig. 10, while the neutral state is maintained from the time point S1 to the time point S2, the neutral state is not necessarily maintained, and the pedal operation at the end of normal sewing is released from the stepped state. May be continuously performed. In this case, when passing through the neutral position in the transition process, both the tread signal 21a and the tread signal 21b are not signaled. The controller 8 triggers this signal-free state, and as described above, the needles 2 and 2 rise near the top dead center, and the looper 1 advances to the left to realize the anti-loosening operation. It starts.

In the time chart of Fig. 10, although the pedal release operation at the time of S2 is continued during the execution of the release preventing operation to be described below, the release operation of the pedal until the release preventing operation is terminated And the release preventing operation is continuously executed by the operation of the control section 8 even after the input of the release signal 21b is stopped.

11 shows the states of the needles 2 and 2 and the looper 1 at the start of the loosening prevention operation. The needles 2 and 2 are in a state of being pulled out above the sewing fabric in which the seams M of the double chain stitches are formed by the two needles 20 and 20 and one looper yarn 10. The looper 1 advances to the left side from the bottom of the sewing cloth and is in a state of capturing two needle loops 20a and 20b formed by the needles 2 and 2. In this state, when the needles 20 and 20 and the looper yarn 10 are cut off, stitch end portions as shown in FIG. 20 are formed.

After the start of the loosening prevention operation, the control unit 8 first gives an operation command to the actual operation cylinder 32 on the output side. Thereby, the thread operation cylinder 32 operates from the extended state shown in FIG. 5 to the contracted state shown in FIG. 6, and the stopper member 4 is driven to move to the right direction, and accordingly, the thread hooking hook 3 and The looper yarn holding member 6 swings about the support shaft 30 through the stopper member 4 and the connecting rod 35 and moves from the standby position to the threading position. At this time, the hook portion 3b at the tip of the thread hook 3 hangs the needle loop 20a on one side (left side), and the swing lever 9 of the stopper mechanism is pressed by the spring 91. By this, it swings clockwise centering around the support shaft 90, and the engaging claw 9a of the front end becomes a state which can be engaged with a part of stopper member 4. As shown in FIG.

Immediately thereafter, the control unit 8 gives an operation command to the actual operation cylinder 32. The actual operation cylinder 32 which received the operation command extends a little from the state shown in FIG. 6 to the state shown in FIG. 7, and the stopper member 4 is linearly driven to the left. The engagement claw 9a at the tip end of the pivotal lever 9 is engaged with a part of the stopper member 4 at the time of small extension of the threaded cylinder 32. [ Thereby, the drive movement to the left direction of the stopper member 4 is temporarily stopped. Thus, in the state in which the drive movement to the left direction of the stopper member 4 was temporarily stopped, as shown in FIG. 12, the said hooking hook 3 has the said waiting position and the thread through the connecting rod 35. As shown in FIG. It moves to the holding position between hanging positions, and stops, and keeps the left needle tip loop 20a in the holding position, and the looper yarn holding body 6 advances to the front side of the looper 1 and receives the looper thread receiving end. The portion 6a holds the looper yarn 10 in front of the needle drop position A on the left side.

After stopping the threading hook 3 and the looper yarn holder 6 in the holding position as described above, the controller 8 at the point of time S3 of FIG. 10, the sewing machine motor 80, the feed reduction mechanism. Operation instructions are given to the 83 and the looper yarn suppression mechanism 84. This operation command is given while referring to the needle position signal 22 until the needles 2 and 2 are lowered and ascend to the position near the top dead center again. Thereby, the sewing operation for one needle for the sewed cloth is performed. The sewing for one needle is performed at a smaller feed amount than during normal sewing by the operation of the transfer reduction mechanism 83. The sewing of this one needle is performed in a state in which the looper thread restraining mechanism 84 operates to inhibit the looper thread 10 from being fed to the looper 1. As a result, the tension of the looper yarn 10 at the end of sewing is improved, so that the anti-loosening effect described later can be enhanced.

As the threading hook 3 and the looper yarn holder 6 are shown in Fig. 12, the transfer movement of the sewing cloth is completed to hold the needles 20 and the looper yarn 10. The needle 2 on the left side descends through the sewing cloth, passes through the needle loop 20a held by the thread hook 3, and continues until the needle loop 20a is captured. At this time, the looper yarn 10 held by the looper yarn holder 6 is positioned to cross the front side of the needle 2 on the left side as shown in FIG. Therefore, the needle 2 on the left side does not capture the looper yarn 10, and the looper yarn 10 is only captured on the rear side of the looper 2 by the needle 2 on the right side.

The control unit 8 gives an operation command to the stopper cylinder 42 of the stopper mechanism at the timing when the needle 2 on the left side captures the needle loop 20a, that is, at the time of S4 in FIG. The 42 is extended, and the output rod 41 is extruded to the left direction and driven accordingly. As a result, as shown in FIG. 8, the swing lever 9 swings in the counterclockwise direction against the swing pressing force of the spring 91 to engage the engaging claw 9a at the tip of the swing lever 9. ) Is disengaged from a part of the stopper member 4, and the temporary stop of the stopper member 4 is released. By the stop release of the stopper member 4, the yarn operating cylinder 32 is extended to the maximum at the time of S4. As a result, the threading hook 3 and the looper yarn holder 6 swing around the support shaft 30 via the stopper member 4 and the connecting rod 35 as shown in FIG. It moves back from a holding position to a standby position, and releases holding | maintenance of the needle loop 20a and the looper yarn 10. FIG.

Then, the looper 1 moves to the right with the lowering of the needles 2 and 2, and exits from the captured sedimentation loop 20a. By exiting the looper 1, as shown in Fig. 14, the needle 2 on the right side is in a state in which the looper yarn 10 is captured as in normal sewing, while the needle 2 on the left side is held. The state becomes the state which captured the immersion loop 20a of the left side.

In this state, the looper 1 switches to advance to the left, and the needles 2 and 2 switch to rise. As shown in FIG. 15, the looper 1 advancing to the left captures the left and right needle loops 20a and 20b, and the rising needles 2 and 2 exit above the sewing cloth. Thereby, the needle 20 which the looper 1 picked-up has previously formed at the position of the needle 2 of the left side, while the looper 10 is looped by another company at the position of the needle 2 of the right side. The so-called looping of the needle loop 20a loops into the needle needle 20.

After the sewing operation for one needle, the needles 2 and 2 rise to the vicinity of the top dead center, and the looper 1 ends in the vicinity of the left advance end. Then, the control part 8 waits until the thread cutting signal 23 is given. When the thread cutting signal 23 is given at the time of S5 of FIG. 10, an operation command is given to the thread cutting actuator 58 of the thread cutting mechanism, and this thread cutting actuator 58 performs a predetermined operation. By this, the thread cutting hook 50 leads to the advance end along the upper part of the looper 1, as shown in FIG. At this time, the first hook portion 52 of the tip portion of the thread cutting hook 50 passes through the needle loops 20a and 20b held by the looper 1 and extends from the tip of the looper 1 to the sewing cloth. The left side of the looper yarn 10 is reached, and the second hook portion 53 faces the needle tip 20 on the left side from the left side.

Subsequently, the thread cutting hook 50 which has reached the advancing end is operated to retract to the right. At this time, the first hook portion 52 captures the looper yarn 10, and the second hook portion 53 sequentially captures the two needles 20 and 20. The looper yarn 10 and the needles 20 and 20 captured in this way are pulled up to the retracted end of the thread cutting hook 50, and are cut by sliding contact with the distal edge of the thread cutting blade 51 as shown in FIG. do. The end of the cut looper 10 is held between the thread cutting hook 50 and the leaf spring 59 on the looper 1 side from the cutting position.

The looper yarn suppressing mechanism 84 continues the operation until the thread cutting operation as described above ends, thereby applying a predetermined tension to the looper yarn 10 extending from the tip of the looper 1 to the sewing cloth. Thereby, the first hook portion 52 at the tip of the thread cutting hook 50 can reliably catch and cut the looper thread 10 without loosening.

After the cutting operation as described above is finished, the controller 8 waits until the needle wiping signal 24 is input. When the sag wipe wipe signal 24 is input at the time of S6 of FIG. 10, an operation command is output to the air wiper 82, and this air wiper 82 is operated. The air wiper 82 blows out air and blows up the cutting ends of the needles 20 and 20 continuous to the needles 2 and 2. Then, the control part 8 outputs an operation command to the cloth pressing cylinder 81 at the time of S7 of FIG. 10, operates this cloth pressing cylinder 81, and raises the presser for cloth pressing, End the loosening prevention operation.

By the series of anti-loosening operations described above, the structure of the seam M of the double chain stitch by the transverse double chain stitch sewing machine as shown in FIG. 18 is obtained. As shown in FIG. 18, the looper yarn 10 is left in FIG. 18 which looks at the right side (seam M from the back side of sewing cloth) formed in the back side of sewing fabric at the end of the seam M of a double chain stitch. Pass through the inside of the needle loop 20a, and retract in front of the needle needle 20 on the same side which exits to the back side of the sewing cloth during the sewing operation of the needle for preventing loosening, and the final needle needle loop 20a on the right side. It is cut at the position that passed through the inside again.

On the other hand, the sedimentation 20 of the left side (right side in FIG. 18) which escapes to the back side of the sewing cloth at the time of the sewing operation for one needle for prevention of loosening is sewing cloth at the end of normal sewing as mentioned above. It passes through the inside of the left side of the needle loop 20b formed on the back side, and loops through the left side of the needle needle loop 20b to form a seam of a single chain stitch. Therefore, as shown in FIG. 18, the looper yarn 10 will be in the state pressed between the needle 20 of the left side and the final needle loop 20b of the left side.

In Fig. 18, the left final submerged loop 20b is shown in a loosened state to specify entanglement with the submerged 20, but the actual left final submerged loop 20b is after the submerged 20 has passed. As shown in FIG. 19, it hardens and becomes the state similar to the final submerged loop 20a of the right side. And, as shown in FIG. 19, when the cut end of the looper yarn 10 is pulled in the direction of the arrow, the loop of the looper yarn 10 passing through the front of the right needle yarn 20 is reduced, and the final needle needle loop on the right hand side is reduced. It is drawn in 20a. As a result, the needle thread 20 is in a state sandwiched between the looper yarn 10 and the final needle needle loop 20a on the right side, and the needle yarn 20 and the looper yarn 10 make the "knots" as shown in FIG. 19. Is formed. This "knot" also applies a resistance to the looper yarn 10 and prevents the looper yarn 10 from being pulled out. Therefore, when the state shown in Fig. 19 is obtained, the seam M of the double chain stitch is loosened. Can be reliably prevented by the synergistic effect of the in-house roofing part on the left side and the "knot" on the right side.

The characteristic configuration of the double chain stitch sewing machine having the configuration as described above in detail and having the seam loosening prevention device which performs the loosening prevention operation as described above, that is, the patent application technology by the applicant EMBODIMENT OF THE INVENTION The improved structure which this invention employ | adopted in order to solve the problem which existed is demonstrated below centering on FIGS.

As shown in FIGS. 2-4, the needle plate base 11 attached to the upper surface of the sewing machine bed part B is divided into 2 parts of the left needle plate base 11L and the right needle plate base 11R. On the upper surface of the left needle plate base 11L, the needle plate P is detachably attached to the needle plate P via the fixing screw 100, and the support shaft serving as the swinging center of the thread hooking hook 3 of the needle holding mechanism is detachable. (30) is supported.

The needle plate P in the vicinity of the front and rear plural places (two places) near the left end in the left needle plate base 11L divided into two, specifically, the front end (left end) of the sewing machine arm C shown by a virtual line in FIG. The screw hole 101 is formed in the location away from the attachment location of the). Through the fixing screw member 102 screwed into these screw holes 101, the left needle plate base 11L is attached to the upper surface of the sewing machine bed portion B so as to be fastened, fixed and released (removable).

Moreover, as shown in FIG. 3, on the upper surface of the sewing machine bed part B, and the said left needle plate base 11L, the knock pin 103 is located in the place separated from two fastening fixing points by the said fixing screw member 102. Moreover, as shown in FIG. ) And a pin hole 104 into which the knock pin 103 is fitted. By inserting and pinning the pin hole 104 into the knock pin 103 from above, the left needle plate base 11L is positioned at a predetermined position and posture with respect to the sewing machine bed portion B, and the fixing is performed in this state. By screwing the screw member 102 into the screw hole 101, 11 L of left needle plate bases can be fastened and fixed to the upper surface of the sewing-machine bed part B. As shown in FIG.

In addition, in this embodiment, although the knock pin 103 protrudes upwards from the upper surface of the sewing machine bed part B, the pin hole 104 was demonstrated and shown in the left needle plate base 11L, Instead, the knock pin 103 may protrude downward from the lower surface of the left needle plate base 11L, and the pin hole 104 may be formed on the upper surface of the sewing machine bed portion B. As shown in FIG.

On the other hand, the two-segment right needle plate base 11R constitutes a cylinder mounting base portion (hereinafter referred to as the right needle plate base 11R cylinder supporting portion) for supporting the seal operation cylinder 32 and the stopper cylinder 42. The stopper mechanism mentioned above is arrange | positioned under 11 R of this cylinder mounting base parts. In detail, as shown in FIGS. 5 to 8, the seal operating cylinder 32 is fixedly supported by the mounting screw 105 on the lower surface of the cylinder mounting stand 11R. The stopper cylinder 42 is arrange | positioned at the lower part in the state of two-stage superposition, and this stopper cylinder 42 is fixedly supported by the cylinder mounting base part 11R via the attachment screw 106. As shown in FIG.

The cylinder attachment portion 11R is fixedly attached to the side surface of the sewing machine bed portion B via a fixing screw member 107. [ Here, the fixed state is fixed at a predetermined position by the fastening of the fixing screw member 107 when the anti-loosening device H is attached to the sewing machine bed portion B, and after mounting, the predetermined state is not fixed and the predetermined position is not performed. Indicates the state fixed to the mounting position.

One end (right end) of the connecting rod 35 is rotatably connected to the stopper member 4 of the stopper mechanism by a pin screw 108. One end of the connecting rod 35 and the cylinder mounting portion 11R at a position corresponding to the connecting portion by the pin screw 108 of the stopper member 4 are linearly in the left and right directions along the expansion and contraction of the seal operating cylinder 32. Long elongated grooves 109 are formed along the left and right directions to allow linear reciprocation of the reciprocating stopper member 4.

In addition, at the other end of the connecting rod 35, the connection end portion 35a with the extension mounting portion 3c that is connected to the thread hooking hook 3 has a depth corresponding to approximately the thickness of the extension mounting portion 3c. It is bent downward. The pin 110 protrudes upward in the connection end part 35a of the connection rod 35 bent downward. On the other hand, the extension part 3c is provided with the connection hole 111 which can be inserted into this pin 110 from the upper side of the said pin 110, and can be escaped upwards. By this, when the left needle plate base 11L is released from the sewing machine bed part B by being fixed to the sewing machine bed part B, the connecting rod 35 and the extension installation part 3c are fixedly connected. For example, it is not necessary to perform the operation of releasing the interlocking state between the two by loosening the fixing screw or the like, and simply lifting the left needle plate base 11L upward, thereby connecting the connecting hole 111 of the extension portion 3c. Can be pulled upward from the pin 110 to release the interlocking state between the connecting rod 35 and the extension mounting portion 3c (thread hooking hook 3). Moreover, also when attaching the left needle plate base 11L to the sewing machine bed part B, only the operation of moving the left needle plate base 11L from the upper side toward the sewing machine bed part B, the connection hole 111 is moved from above. By inserting into the pin 110, it is possible to return the connection rod 35 and the extension installation part 3c (thread hooking hook 3) to an interlocking state. In addition, the connecting end portion 35a of the connecting rod 35 does not necessarily need to be bent downward. That is, the connecting rod 35 may be a flat plate shape over its entire length.

Moreover, the rocking lever mount table (moving table) 92 which supports the rocking lever 9 in the stopper mechanism so that the rocking lever 9 can swing around the support shaft 90 in the up and down direction is attached to the cylinder mounting portion 11R. Through the long hole 93 and the fixing screw 94 which are long in the left-right direction, it is attached so that position adjustment is possible from left to right. This is because the swing lever mount 92 is positioned to the left and right with respect to the cylinder mount 11R even after the cylinder mount 11R is fixed to the sewing machine bed portion B via the fixing screw member 107. By adjusting, it is possible to arbitrarily adjust the timing at which the looper 1 exits from the sedimentation loop 20a held by the thread hooking hook 3, thereby reliably performing self-looping for preventing seam loosening. can do.

In the transverse double chain stitch sewing machine of the present embodiment including the seam loosening prevention device H employing the feature configuration described above, the seam loosening prevention device H can be attached to the sewing machine bed portion B. FIG. At this time, it is possible to attach the left needle plate base 11L and the right cylinder attachment base 11R of the right side of the needle plate base 11 divided into two parts to the sewing machine bed portion B separately. Therefore, as in the case of the patent application filed by the present applicant, compared with the case of handling one long and large needle plate base, the attachment (mounting) work to the sewing machine bed portion B of the entire anti-loosening device H is less. We can do it comfortably by labor force.

Incidentally, after the needle plate base 11 (the left needle plate base 11L and the right cylinder attaching portion 11R) is once attached to the sewing machine bed portion B, for example, for the looper 1 or its operation, When it is necessary to adjust the stitch state by modifying the position or movement trajectory of the members constituting the stitches accommodated inside the sewing machine bed portion B in the lower part of the needle plate base 11 such as a member, or the needle plate base ( In the lower part of 11), when maintenance, such as repair and replacement of the various components accommodated in the inside of the sewing machine bed part B, is needed, the thread operation cylinder 32 with which the air tubes 33 and 43 are connected, and When mounting the stopper cylinder 43, the cylinder mounting base portion 11R, which is firmly supported at a predetermined position, does not need to be separated from the sewing machine bed portion B, and only the left needle plate base 11L is sewn on the sewing machine bed portion B. Unsecured from and separated from As it is possible to secure a sufficiently large working space.

Therefore, only the left needle plate base 11L, which is small and light, and in which the air tubes 33 and 43 are not entangled, is handled, and the adjustment of the stitch state and the repair of the various parts accommodated in the sewing machine bed part B are performed. Maintenance such as replacement can be performed very easily, simply, and with good workability. As a result, a good stitch state and a predetermined anti-loosening function can be exhibited with good reproducibility at all times, and the problem left in the existing patent application technology by the present applicant can be solved.

In addition, as in the present embodiment, the swing lever 9 in the stopper mechanism is swing-pressed by using the spring 91 in the direction in which the thread hook 3 in the needle holding mechanism is positioned at the standby position. By adopting the configuration, since the operation in the return direction of the stopper member 4 (operation in the direction in which the threading hook is located in the standby position) is performed at the pressing force of the spring 9, it is hooked on a part of the stopper member 4. Since the unidirectional air cylinder can be used as the stopper cylinder 42 for operating the swing lever 9 for aligning and disengaging, the stopper cylinder 42 can be miniaturized and reduced in cost.

In addition, as in the present embodiment, the seal operation cylinder 32 in the needle holding mechanism and the stopper cylinder 42 in the stopper mechanism are placed in the state of overlapping two lower stages on the lower surface of the cylinder mounting stand 11R. By adopting the structure to fix and hold, two air cylinders 32 and 42 are compared with the case where two air cylinders 32 and 42 are disposed (arranged) at a position apart from each other, as in the patent application filed by the present applicant. The entire space of the anti-loosening device H can be compacted by reducing the planar space occupied by the, so that the anti-loosening device H can be accommodated inside the sewing machine bed portion B.

In addition, as in the present embodiment, the support shafts (up and down) of the thread hooking hook 3 of the needle holding mechanism 3 are disposed between the thread hooking position, the holding position, and the standby position together with the thread hooking hook 3. A looper yarn holder for holding the looper yarn extending from the looper 1 to the sewing cloth at a front side than the lowered position of the needle 2 by oscillating an inner surface approximately parallel to the needle plate P with the center ( By adopting the structure of attaching 6), the looper yarn 10 can be reliably positioned together with the needle tip 20 while being a simple structure. As a result, the company's roofing can be performed reliably, and the seam loosening effect can be made more reliable.

In particular, by attaching the looper yarn holder 6 so that the position can be adjusted with respect to the thread hook 3, it is possible to appropriately set the relative position between the needle tip 20 and the looper yarn 10. The roofing can be performed more reliably to further increase seam protection.

In addition, as in the present embodiment, the pin 110 protrudes upward from the connecting end portion 35a of the connecting rod 35, and the connecting end portion (extended mounting portion) on the thread hooking hook 3 side. 3c)) employing a configuration in which a connecting hole 111 is formed which can be inserted into and exited from the pin 110 from above and above the pin 110, thereby adjusting the stitch state or sewing machine bed portion B. FIG. When the left needle plate base 11L is released from the upper surface of the sewing machine bed portion B and separated from the upper surface of the sewing machine bed portion B in order to perform maintenance such as repair or replacement of various parts contained therein. No need for troublesome operation such as loosening the screw for connection between the connecting rod 35 and the extension part 3c on the thread hooking hook 3 side, or pulling out the connecting pin, Just lift the left needle plate base 11L upwards It is possible to disconnect the hook 3 and the connecting rod 35. In addition, after the adjustment and maintenance described above, the left needle plate base 11L is fixed and attached to the sewing machine bed portion B from above, and the thread hooking hook 3 and the connecting rod 35 are in a predetermined connection state. It is possible to return to Thereby, the trouble of the adjustment and maintenance mentioned above can be simplified further.

In addition, although the above-mentioned embodiment demonstrated the thing which used the air cylinder as a hook actuator and a stopper actuator, you may use an electromagnetic solenoid as these actuators.

In addition, in the above-mentioned embodiment, although forming the seam of the double chain stitch by the two needles 20 and 20 and the one looper yarn 10 was demonstrated, the multiple needle double which uses three or more needles Forming the seam of the chain stitch, forming the seam of the one-erosion double chain stitch using one needle, and also the top cover double chain stitch to perform top cover sewing on the seam of the double chain stitch. You may apply it to a sewing machine.

In the above-described embodiment, one of the needle loops formed by the two needle needles 20 and 20 is picked up and held in the holding position, and the sewing operation for one needle is performed in this state. Although the case of self-looping and preventing loosening was explained, a plurality of sedimentation loops may be captured and held at the holding position, and the sewing operation in this holding state is not limited to one needle, but for two needles. Or more may be sufficient.

In addition, in the above-mentioned embodiment, although the looper yarn holder 6 was attached in the state which is fastened together with the thread hook 3, the both 6 and 3 demonstrated the unity rocking motion, The fur yarn holder 6 may be provided separately from the thread hooking hook 3, and may be operated separately by a dedicated actuator different from the thread operation cylinder 32 for the thread hooking hook 3 operation.

In addition, installation of the looper yarn holder 6 is not essential.

(Industrial applicability)

By dividing the needle plate base from left and right, the needle plate base on the left side and the cylinder mounting portion on the right side can be handled separately, thereby attaching (mounting) to the sewing machine bed portion of the entire anti-loosening device, adjusting the stitch state, and sewing machine. Maintenance such as maintenance and replacement of various parts accommodated in the bed part can be performed easily with a small labor force, and can be suitably applied to a double chain stitch sewing machine.

One… Looper
2… needle
3 ... Thread hook
4… The stopper member
6 ... Looper
8… The control unit
9 ... Pivot lever
10 ... Rufusa
11 ... Needle plate base
11L... Left needle base
11R... Cylinder mounting base (right needle plate base)
20 ... Tyre
20a, 20b ... Needle thread loop
30 ... Support shaft in the vertical direction
32 ... Actuating Cylinder (Hook Actuator)
35 ... Connecting rod (connecting member)
42 ... Stopper cylinder (stopper actuator)
91 ... spring
92 ... Swing lever mount (movable stand)
102 ... Screw member
103 ... Knock pin
104 ... Pin hole
110 ... pin
111... Connecting hole
A ... Needle drop position
B ... Sewing machine bed portion
P ... Needle plate
M ... Double chain stitch seam

Claims (14)

It is possible to move the needle up and down while maintaining the needle and the looper yarn to move back and forth in a direction orthogonal to the vertical movement path of the needle, and to capture the needle loop formed by the needle under the needle plate during the advancement operation. A needle and a needle plate base attached to the upper surface of the sewing machine bed portion, and a needle loop formed by the needle under the needle plate by the looper, and the needle is attached to the looper yarn held by the looper. As a double chain stitch sewing machine to form the double chain stitch seam on the sewing cloth by roofing the third party,
A threading hook capable of approaching and displacing the looper and oscillating in a plane approximately parallel to the needle plate about a support shaft in the up and down direction between a standby position away from the looper and a threading position approaching the looper. And an acupuncture holding mechanism having a hook actuator that drives the threading hook to the standby position and the threading position;
The thread is disposed at a position farther from the needle plate than the thread hook of the needle holding mechanism, so that the needle loop is held at the holding position between the thread hook position and the standby position by the thread hook hook captured at the thread hook position. A stopper mechanism having a stopper member capable of temporarily stopping and releasing the swing from the threading position of the hooking hook to the standby position and a stopper actuator responsible for stopping and releasing the stopper member;
A connection member for linking the threading hook of the needle holding mechanism and the stopper member of the stopper mechanism;
After the normal sewing is finished, the looper is moved out, and the hooking hook of the needle holding mechanism is moved close to the looper to move the needle loop loop captured at the threading position to the holding position. And maintain this state until the needle descends through the needle loops captured by the looper, and then releases the position maintenance of the needle loops and the looper yarn to perform at least one needle sewing operation. In the double chain stitch sewing machine having a seam loosening device having a control unit for controlling the needle holding mechanism and the stopper mechanism in connection with the vertical movement of the needle, the movement of the looper and the transfer operation of the sewing cloth.
The needle plate base is divided into a left needle plate base which attaches the needle plate and supports the swing support shaft of the thread hook, and a right needle plate base which fixes the stopper member, the hook actuator and the stopper actuator,
The right needle plate base is fixed to the sewing machine bed part, and the left needle plate base is attached to the upper surface of the sewing machine bed part through a screw member so as to be fastened, fixed and released. Double Chain Stitch Sewing Machine. The method according to claim 1, further comprising a transfer reduction mechanism for transferring the sewing cloth at a smaller feed amount than during normal sewing in accordance with an operation instruction given from the control unit in the sewing operation for at least one needle. Double chain stitch sewing machine with seam lock. The looper yarn suppressing mechanism according to claim 1, wherein after the looper yarn is positioned on the front side or the rear side of the needle lowering position, the looper yarn suppressing mechanism for controlling the feeding of the looper yarn to the looper by an operation command given from the controller. Double chain stitch sewing machine with seam loosening device characterized in that it further comprises. 2. The stopper mechanism according to claim 1, wherein the stopper mechanism includes a stopper member which is directly connected to the hook actuator and linearly reciprocates, a rocking lever that can be engaged with and released from a portion of the stopper member, and the rocking lever is hooked to the thread hook. And a spring for rocking and pressing in a direction in which the air is positioned in the standby position, and the stopper actuator for releasing the rocking lever from a part of the stopper member in response to a pressing force of the spring. Chain stitch sewing machine with The double chain stitch sewing machine according to claim 4, wherein the swing lever in the stopper mechanism is attached to a movable table attached to the right needle plate base so as to be adjustable left and right. The double chain having a seam loosening prevention device according to claim 4, wherein the hook actuator of the needle holding mechanism and the stopper actuator of the stopper mechanism are fixedly supported on the lower surface of the right needle plate base in two-up and down overlapping states. Stitch sewing machine. The loop extending from the looper to the sewing cloth by swinging an in-plane approximately parallel to the needle plate between the threading position, the holding position and the standby position together with the threading hook of the needle holding mechanism. A double chain stitch sewing machine with a seam loosening prevention device, further comprising a looper yarn holding body for holding the fursa in front of the needle lowering position and an actuator for rocking the looper yarn holding body. 2. The looper yarn holder according to claim 1, wherein the looper yarn retainer is integral with the threading hook of the needle holding mechanism and has a surface substantially parallel to the needle plate about the support shaft between the threading position, the holding position and the standby position. A double chain stitch sewing machine with a seam loosening prevention device, characterized in that attached to the threaded hook in a state of being coupled together to swing. The double chain stitch sewing machine according to claim 8, wherein the looper yarn holder is attached to the threading hook so as to be adjustable in position. The double chain stitch sewing machine according to claim 1, wherein both the hook actuator of the needle holding mechanism and the stopper actuator of the stopper mechanism are air cylinders. The connecting end portion of the connecting member protrudes upward from the connecting end portion, and the connecting end portion of the threading hook is inserted into the pin and upwards from the pin. A double chain stitch sewing machine with a seamlocking device, characterized in that a connection hole is formed which can be pulled out. The knock pin according to claim 1, wherein the left needle plate base is capable of positioning the left needle plate base with respect to the sewing machine bed part in a plurality of locations separated from the plurality of fixed connection and disconnection points by the screw member. This protrudes, the sewing machine bed portion or the left needle plate base is a double chain stitch sewing machine with a seam loosening device, characterized in that a pin hole that can be fitted to the knock pin is formed. 2. The double chain stitch sewing machine with a seam loosening device according to claim 1, wherein the sewing machine as a target is a transverse cylindrical type 1 eroded double chain stitch sewing machine. 2. A double chain stitch sewing machine with a seam loosening prevention device according to claim 1, wherein the sewing machine as a target is a plural erosion double chain stitch sewing machine.

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