JP2005058700A - Needle guard device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle guard device of a sewing machine which can prevent damage of a needle, such as breaking, by collision of the needle against a needle guide member even if the top of the needle bends largely and which keeps the needle and the needle guide member in contact with each other for a long time to ensure a catch of a needle thread loop by a looper. <P>SOLUTION: A needle guard member 15 is brought into contact with a needle to guide a needle 9 in the regular moving track position when the needle 9 is made to cooperate with a looper 34 to form a stitch. A needle guard swing mechanism is provided on the needle guard member 15 for causing the needle guard member 15 to swing the needle guard board 13 having the needle guard member 15 horizontally and vertically combinedly to give a horizontal movement along a sewing direction and a vertical movement. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a needle receiving device for a sewing machine. Specifically, by reciprocatingly swinging so as to draw an elliptical trajectory in a direction perpendicular to the sewing progressing direction in synchronization with the needle reciprocating up and down in conjunction with the rotation of the main spindle of the sewing machine. A looper that captures the needle thread loop to form a seam, a cloth feed dog that feeds the cloth in the direction of sewing in synchronism with the vertical reciprocation of the needle, and the needle that forms a seam in cooperation with the looper The present invention relates to a needle receiving device for a sewing machine including a needle receiving member that contacts the needle and guides the movement of the needle.

  In a double chain stitch or flat stitch sewing machine, when the needle moves downward from the top of the cloth through the cloth toward the bottom dead center, the cloth penetration resistance or the tension of the needle thread when the needle moves downward is increased. The tip of the needle may bend so as to deviate from the normal movement locus due to adjustment or the like. When the needle moves upward from the bottom dead center, the needle advances and swings from the side of the needle so as to draw an elliptical locus in a direction perpendicular to the sewing progress direction in order to capture the needle thread loop. Since the swinging movement locus of the moving looper is set to pass the last position on the back of the needle, the needle interferes with the looper when the tip of the needle is bent toward the movement locus side of the looper. Will do.

  In particular, in the case of a so-called multi-needle sewing machine in which a plurality of needles are arranged side by side in a direction orthogonal to the sewing progress direction, the looper tip that reciprocally swings across the plurality of arranged needles Since the movement trajectory of the part is an elongated ellipse, the movement ellipse trajectory at the tip of the looper can be set based on any of a plurality of parallel needles, A gap is generated between the front of the looper, and as a result, the looper tip does not enter the needle thread loops well, so-called skipping or thread breakage occurs, or the needle and the looper intersect. In some cases, the two may collide and break the needle.

  In order to prevent inconvenience such as needle-looper interference caused by such needle bending and skipping, thread breakage, or needle breakage in a multi-needle sewing machine, conventionally, the cloth feed dog has a vertical direction. The needle receiving member is fixedly supported on a square piece pivotally supported on the eccentric part of the drive shaft to give the movement of the needle, so that when the needle moves down through the cloth, it contacts the needle. The needle movement is guided to the normal movement locus position, and when the needle moves upward from the bottom dead center, the needle receiving member also moves upwardly while maintaining contact with the needle, and the needle is lifted. There is known a needle receiving device configured to circularly move a needle receiving member so as to guide the movement to a normal movement locus position (for example, see Patent Document 1).

  In addition, a needle guide drive shaft that is linearly reciprocated horizontally in the cloth feed direction (sewing advance direction) in conjunction with the rotation of the main spindle of the sewing machine is provided at a position below the cloth feed teeth. When the needle starts to move downward from the top to the bottom dead center, the needle approaches or contacts the needle by a straight horizontal movement from the rear side to the front side in the cloth feed direction, and guides the needle to the normal movement locus position. Also known is a front / rear horizontally movable needle guide device (needle receiving device) provided with a needle guide member that is separated from the needle by a linear horizontal movement in the cloth feed direction rearward when the needle moves up from the bottom dead center. (For example, refer to Patent Document 2).

  Japanese Utility Model Publication No.57-4949   JP-A-4-24084

  Among the conventional needle receiving devices described above, in the case of the former needle receiving device, even if the cloth feeding pitch (cloth feeding amount) by the cloth feeding teeth is changed, the position of the needle receiving member is changed in the cloth feeding direction. Since the needle passes through the cloth and starts to move downward toward the bottom dead center of the range of motion, it is relatively long from the bottom dead center to the upper position where the needle rises upward. While maintaining the contact between the needle receiving member and the needle over time, the needle guiding operation can be reliably performed without any timing deviation regardless of the change in the cloth feed pitch, while the needle receiving member is removed from the square piece. Because it is fixedly projected in the feed direction, the square piece is subject to an offset load, and the square piece tends to be loose when used for a relatively short period of time. Changes slightly and the guide action on the needle Surely, become unstable, bad sewing due to skipped stitches and thread breakage, etc. while it is used over a long period of time, there is a problem in that it is inevitable that leads to a decrease in the sewing quality.

  Of the above-described conventional needle receiving devices, in the case of the latter front and rear horizontal movable type needle receiving device, not only can the needle guiding operation by the needle receiving member be performed reliably regardless of the change in the cloth feed pitch, The needle guide member is linearly moved back and forth in the cloth feed direction in synchronization with the vertical movement of the needle, so that even if the amount of bending at the needle tip is large, the needle may be damaged due to the collision between the needle and the needle guide member. However, since the contact time between the needle and the needle guide member is very short, it is very difficult to set the contact timing between them. In detail, the needle thread loop is usually formed small and drooping due to the very high speed up and down movement of the needle, and the needle thread loop with such drooping feeling is not crushed by the needle receiving member. The needle must be moved close to or in contact with the needle quickly by moving straight and horizontally in the forward direction following the high speed. In order not to crush the needle thread loop that seems to hang down with the needle receiving member, the contact position is set below the needle thread loop that hangs the needle receiving member against the needle, i.e., the tapered portion where the needle tip below the needle hole is narrow and sharp. Must be set. However, it is very difficult to bring the needle and the needle receiving member into contact with each other with good timing in a state close to a point under such high-speed conditions, and to maintain the contact timing in terms of design technology and mechanism. Yes, the looper cannot catch the needle thread loop due to a slight shift in contact timing from the beginning of the product, or a shift in contact timing caused by mechanical wear due to use, etc., or the looper and needle interfere with each other. There was a problem that the needle collided and received damage such as breakage or bending deformation of the needle.

  The present invention has been made in view of the above circumstances, and its purpose is to avoid a situation in which the needle breaks due to a collision between the needle and the needle guide member even when the amount of bending of the needle tip is large. In addition to this, the sewing machine can always perform reliable and high-quality sewing even during long-term use by ensuring a long contact time between the needle and the needle guide member and eliminating a mistake in capturing the needle thread loop by the looper. It is to provide a needle receiving device.

  In order to achieve the above object, a needle receiving device for a sewing machine according to the present invention includes a needle that reciprocates up and down in conjunction with rotation of the main spindle of the sewing machine, and a direction orthogonal to the sewing progressing direction in synchronization with the vertical reciprocation of the needle. A looper that captures the needle thread loop by reciprocatingly swinging so as to draw an elliptical trajectory in the direction of movement, and a cloth feed tooth that feeds the cloth in the sewing progressing direction in synchronization with the vertical reciprocation of the needle And a needle receiving member for a sewing machine that contacts the needle and guides the movement of the needle when the needle cooperates with the looper to form a seam. A needle receiver swinging mechanism is provided for causing the needle receiver member to swing horizontally and vertically so as to give horizontal movement and vertical movement along the sewing progress direction.

  According to the needle receiving device of the sewing machine according to the present invention having the above-described configuration, when the seam is formed by the cooperation of the needle and the looper, the needle receiving member that contacts the needle and guides the movement of the needle is horizontal and Synthetic rocking motion up and down causes the needle tip to deviate from the normal trajectory due to cloth penetration resistance when the needle moves down through the cloth and the tension of the needle thread. Even when the needle is bent in such a large amount, the needle receiving member collides with the horizontal movement of the needle receiving member synchronized with the vertical movement of the needle, that is, the approaching / separating movement with respect to the needle, causing the needle to break or the needle tip portion to be broken. It is possible to avoid the occurrence of damages such as bending and deformation. Furthermore, since the contact time between the needle and the needle receiving member can be ensured long by the combined swinging motion of the needle receiving member in the front and rear and up and down directions, there is a margin in the setting range of the contact timing between the needle receiving member and the high speed condition. In order to prevent the needle receiving member from hanging down below the needle thread loop and crushing the needle thread loop, the contact point of the needle receiving member with respect to the needle is narrow and sharp at the needle tip below the needle hole. It is not necessary to set the taper part, and the contact timing of both can be set easily and appropriately in terms of design technology and mechanism. Eliminates the inconvenience that the looper cannot catch the needle thread loop, or the looper and the needle interfere (collision) and receive damage such as breakage or bending deformation of the needle even if a deviation occurs. Can, therefore, an effect that it is possible to obtain a predetermined stitch reliably and stabilize well form a high-quality sewing products even when used for a long period of time.

  In particular, according to the present invention, as described in claim 5, a plurality of needles are juxtaposed in a direction perpendicular to the sewing progress direction, and the looper reciprocally swings the juxtaposed needles. This is effective when applied to a multi-needle sewing machine configured to move dynamically. That is, in the case of a multi-needle sewing machine, regardless of which of the multiple parallel needles is used as the reference for the movement elliptical locus of the looper tip, the back surface of the needle other than the needle serving as the locus reference and the front surface of the looper A gap is generated between the two loops and the tip of the looper cannot enter all of the needle thread loops well, causing skipping or thread breakage, or when the needle and looper intersect. There is a situation in which the inconvenience of breaking the needle due to a collision is likely to be caused. Even in this case, since the contact time between the needle and the needle receiving member can be secured long by the vertical movement of the needle receiving member, the looper crosses a plurality of needles until the predetermined reciprocating rocking motion is completed. Each needle can be guided to the proper movement locus position in time with the movement of the looper to prevent the looper and needle from interfering with each other, and the looper tip can be surely and smoothly entered into a plurality of needle thread loops to make the needle by the looper. The thread loop can be reliably captured. ・

  In the needle receiving device for a sewing machine according to the present invention, as a needle receiving swinging mechanism for combining and swinging the needle receiving member horizontally and vertically, as described in claim 2, the cloth feed dog has a horizontal along the sewing progress direction. Even if the cloth feed base is integrally incorporated in a cloth feed rocking mechanism that swings the cloth feed base horizontally and vertically so as to give movement and vertical movement, It may be provided separately from the cloth feed rocking mechanism for synthesizing and swinging the cloth feed base horizontally and vertically so as to give the teeth horizontal movement and vertical movement along the sewing progress direction. By incorporating it integrally with the cloth feed swing mechanism as in the former, the space occupied by both the swing mechanisms can be reduced, which is effective as a needle receiving device for a sewing machine having a small-diameter cylinder bed.

  Further, in the needle receiving device of the sewing machine according to the present invention, as described in claim 4, the horizontal and vertical combined momentum along the sewing progress direction of the needle receiving member can be adjusted by the needle receiving swinging mechanism. It is desirable to provide a momentum adjustment mechanism. In this case, it is possible to easily adjust the contact timing of the needle and the needle receiving member and the contact timing thereof and the entry timing of the looper into the needle thread loop at the time of a trial operation after the assembly of each member and mechanism. The occurrence of the inconvenience as described above can be surely prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of a multi-needle double chain stitch cylinder type sewing machine to which a needle receiving device for a sewing machine according to the present invention is applied, from the upper part of a column part 2 erected on a base 1 to the front side. The sewing machine arm 3 is horizontally extended toward the front, and a thin cylindrical cylinder bed 4 is horizontally extended from the upper and lower intermediate portions of the support column 2 toward the front side. 5 is attached, and a cylinder cover 6 is fitted to the tip of the cylinder bed 4. The tip of the sewing machine arm 3 is connected to a needle bar drive mechanism (not shown in detail since it is well known) disposed in the sewing machine arm 3 so as to be driven by the sewing machine main shaft 7. A needle bar 8 that is reciprocated up and down is supported, and a plurality of pieces that reciprocate up and down in conjunction with the rotation of the sewing machine main shaft 7 via a needle stopper 10 (see FIG. 5) at the lower end of the needle bar 8. A book 9 (shown as three in the drawing but may be two or four or more) is fixed.

  2 is an exploded perspective view of the cloth feed swing mechanism and the needle receiver swing mechanism disposed in the cylinder bed 4, FIG. 3 is a plan view showing the assembled state of both the swing mechanisms, and FIG. FIG. 4 is a right side view of FIG. 3. 2 to 4, 11 is a front cloth feed base, 12 is a rear cloth feed base, 13 is a needle receiving base, and the front and rear reciprocating movements of the needle 9 are at the front ends of the front and rear cloth feed bases 11 and 12. The front cloth feed dog and the rear cloth feed dog (which are well-known structures and are not shown in the figure) that feed the cloth in the sewing progressing direction in synchronization with the needle 9 A needle receiving member 15 that contacts the back surface of the needle 9 and guides the movement of the needle 9 is fixedly supported via a needle receiving mounting base 14, and is formed on the lower surface of the intermediate portion in the longitudinal direction of each base 11, 12, 13. A common square piece 19 is slidably inserted back and forth through auxiliary plates 16, 17, 18 in the notch grooves 11 a, 12 a, 13 a, and the rear ends of the stands 11, 12, 13. A common square piece 40 is slidably inserted back and forth in the bifurcated portions 11b, 12b and 13b formed in the portion. It is. Further, substantially elliptical long holes 11c, 12c, and 13c are formed at the rear positions of the cutout grooves 11a, 12a, and 13a of the platforms 11, 12, and 13, respectively.

  On the other hand, a feed upper / lower rod 21 is fitted to the sewing machine main shaft 7 via a feed upper / lower eccentric 20, and a needle receiving rod 23 is fitted via an eccentric 22. A front end of the feed upper / lower rod 21 is connected to a rear end bifurcated portion 25a of a feed upper / lower arm base 25 via a pin 24, and a front end of the needle receiving rod 23 is fed to the sewing machine main shaft 7 before and after feeding. The other end portion of the swing link 27 that swings back and forth around the swing shaft 26 in conjunction with a feed front / rear rod (not shown because it is well known) fitted through an eccentric and a needle holder The rear end of the link 28 is connected by a pin 29.

  The front and rear cloth feed bases 11 and 12 and the needle receiving base 13 are housed in an overlapped state at the tip bifurcated portion 25b of the feed upper and lower arm base 25, and are inserted into and held by these bases 11, 12, and 13. The central portion of the common square piece 19 is connected to and supported by the feed upper / lower arm base 25 via a pin 30 and is inserted into substantially elliptical long holes 11c, 12c, 13c formed in the respective bases 11, 12, 13. The feed upper / lower arm pin 31 fixedly installed between the opposing plate pieces of the feed upper / lower arm base 25 is inserted, and the tip of the needle cradle link 28 is inserted into the elongated hole 13c in the needle cradle 13 via the screw 32. It is connected to the position immediately after. With the above-described components, the needle support link 28 swings back and forth by the back and forth swinging around the swing shaft 26 of the swing link 27 accompanying the rotation of the sewing machine main shaft 7, and the back and forth swing and feed upper and lower arm bases. With the vertical swing of 25, the front and rear cloth feed bases 11 and 12 are combined to swing back and forth horizontally and vertically so that the front and rear cloth feed teeth are given horizontal and vertical movements and vertical movements along the sewing progress direction. A cloth feed swing mechanism for causing the needle receiver 13 to swing back and forth horizontally and vertically so as to give the needle receiver member 15 a horizontal motion and a vertical motion along the sewing progress direction. These two swing mechanisms are integrally incorporated in the cylinder bed 4.

  Further, as shown in FIG. 5, the needle 9 is moved up and down by the swinging motion of the looper drive shaft 33 interlocked with the rotation of the sewing machine main shaft 7 as shown in FIG. A looper that reciprocally oscillates so that a plurality of needles 9 arranged side by side in a direction orthogonal to the sewing progressing direction are crossed from the side in synchronism with the movement so that the tip 34a draws an elongated elliptical movement locus. 34 is arranged, and by the reciprocating rocking motion of the looper 34, the needle thread loop formed by each needle 9 is sequentially captured to form a predetermined seam.

Next, the operation and action of the needle receiving device of the cylinder type double chain stitch multi-needle sewing machine configured as described above will be described.
When the needle 9 starts to move downward in conjunction with the rotation of the sewing machine main shaft 7, the combined movement in the front and rear horizontal and vertical directions of the needle receiving swing mechanism described above causes the combined movement in the lower and front horizontal directions on the needle receiving base 13. As a result, the needle receiving member 15 starts to move from the rear upper side to the front lower side in the sewing progress direction. When the needle 9 passes through the cloth and reaches the bottom dead center and moves upward from the bottom dead center, the needle receiving member 15 contacts the back surface of the needle 9 as shown in FIG. Even if the tip of the needle 9 is bent backward due to a penetration resistance or the like, the bending is corrected and the needle 9 is guided to a normal movement locus position.

  Further, when the needle 9 starts to move upward from the bottom dead center, the looper 34 swings from the lateral position of the needle 9 so as to pass a marginal position on the back surface of the needle 9, and below each needle 9. The needle thread loops are sequentially captured by the needle thread loops formed on the needle holder 13 at this time. Since the rear horizontal direction of the combined motion is given, the needle receiving member 15 follows up while maintaining the contact state with the needle 9 until the needle 9 reaches a predetermined height position from the bottom dead center, and is for a certain length of time. The contact between the both 15 and 9 is maintained, and the action of correcting the bending of the needle 9 and guiding it to the normal movement locus position is surely exhibited. Thereafter, the needle receiving member 15 is separated from the needle 9 and returns to the rear upper position in the sewing progress direction as shown in FIG.

  In this way, when the seam is formed by the cooperation of the needle 9 and the looper 34, the needle receiving member 15 that contacts the needle 9 and guides the movement thereof is combined and moved horizontally and vertically, so that the needle 9 is moved. Even when the tip of the needle 9 is bent so as to deviate from the normal movement locus due to cloth penetration resistance or the like, the needle receiving member 15 approaches and comes into contact with the needle 9 as the needle 9 starts to rise. 9 can be corrected and guided to the normal movement locus position, so that it is possible to avoid damages such as breakage of the needle 9 due to collision between the needle 9 and the needle receiving member 15 and bending deformation of the needle tip. In addition, since it is possible to ensure a long contact time with the needle 9 by the vertical movement of the needle receiving member 15, there is a margin in the setting range of the contact timing between the both 15 and 9, and therefore mechanical wear. Etc due to needle Even if a slight deviation occurs between the contact timing of the needle receiving member 15 and the contact timing of the needle receiving member 15 and the entry timing of the looper 34 into the needle thread loop, The needle receiving member 15 is crushed and the looper 34 fails to enter the needle thread loop, and the needle thread loop cannot be captured, or the looper 34 and the needle 9 interfere (collision) to cause damage such as breakage or bending deformation of the needle 9. The high-quality sewn product can be obtained by reliably and stably forming a predetermined seam even when used for a long period of time.

In particular, the optimum configuration of the needle receiving member 15 when applied to a multi-needle sewing machine and the needle guiding action thereby will be described with reference to FIGS.
That is, a reciprocating rocking motion across a plurality of needles 9 (in the following description, three needles 9R, 9C, and 9L) arranged side by side in a direction perpendicular to the sewing progress direction. Since the movement locus of the tip of the looper 34 is an elongated ellipse, when the movement ellipse locus of the tip of the looper 34 is set on the back surface of the right needle 9R, the back surface and the looper 34 are arranged in the order of the middle needle 9C and the left needle 9L. Regardless of this, the gap with the tip portion gradually increases. Regardless of this, when the looper 34 is swung, the tip portion of the looper 34 does not enter the needle thread loop formed by the middle needle 9C and the left needle 9L. Obviously, there are inconveniences such as skipping or thread breakage, or when the needle 9 and the looper 34 intersect, both of them collide and break the needle 9.

  In view of this point, in the application form to the multi-needle sewing machine, generally, the motion elliptical locus of the tip of the looper 34 is set on the back surface of the left needle 9L or the middle needle 9C, and the front surface 15a of the needle receiving member 15 is set next. Form as follows. Here, a description will be given assuming that the motion elliptical locus of the tip of the looper 34 is set on the back surface of the left needle 9L. That is, when the motion ellipse trajectory of the tip of the looper 34 is set on the back of the left needle 9L, small gaps are generated in turn between the back of the right needle 9R and the middle needle 9C and the tip of the looper 34, and the right needle 9R. In addition, so-called stitch skipping or thread breakage occurs, in which the tip of the looper 34 does not enter the needle thread loop formed by the middle needle 9C. Therefore, when the tip of the looper 34 intersects with the right needle 9R, as clearly shown in FIG. 7, the front surface 15a of the needle receiving member 15 contacts the back surface of the right needle 9R, and the right needle 9R is slightly forwarded. When the leading end of the looper 34 crosses the middle needle 9C, the front surface 15a of the needle receiving member 15 contacts the back surface of the middle needle 9C as clearly shown in FIG. The center needle 9C is corrected and guided to push forward slightly less than the right needle 9R, and when the tip of the looper 34 intersects the left needle 9L, the needle receiving member is clearly shown in FIG. The front surface 15a of the needle receiving member 15 is arranged in the direction in which the needles 9R, 9C, and 9L are arranged side by side so that the front surface 15a of the 15 is lightly in contact with the back surface of the left needle 9L It is not parallel to the elliptical trajectory of the tip of the looper 34. Formed to be in a row. As a result, the tip of the looper 34 passes through the back of the needle 9R, 9C, 9L without interfering with all the needles 9R, 9C, 9L, and the tip of the looper 34 enters all the needle thread loops. These needle thread loops can be reliably captured without mistakes.

  FIG. 10 is an enlarged perspective view of a main part showing another embodiment of the needle receiving device for a sewing machine according to the present invention. In this embodiment, the notch grooves 11a and 12a of the front and rear cloth feed bases 11 and 12 are shown. A square piece 19A, which is different from the square piece 19 inserted and held so as to be slidable back and forth through the auxiliary plates 16 and 17, is inserted into the notch groove 13a of the needle receiving base 13 (FIGS. 2 and 4). 10, and a pin 30A having an eccentric portion 30a separately from the pin 30 for feeding and supporting the square piece 19 to the upper and lower arm base 25. The needle receiving base 13 is connected to and supported by the upper and lower arm supports 25, and the combined momentum of the needle receiving member 15 in the front and rear horizontal and vertical directions can be adjusted by rotating and fixing the pin 30A with the eccentric portion 30a around the pin axis. A simple momentum adjustment mechanism. .

  In this case, by simply rotating and fixing the pin 30A, the contact timing of the needle 9 and the needle receiving member 15, the contact timing thereof, and the entry timing of the looper 34 to the needle thread loop are tested after each member and mechanism are assembled. It is possible to adjust easily at the time and the like, and it is possible to reliably prevent the occurrence of the inconvenience as described above.

  In the above embodiment, the needle receiver swinging mechanism is integrated into the cloth feed swinging mechanism, and the space occupied by these mechanisms is reduced, so that a sewing machine having a small-diameter cylinder bed as illustrated in FIG. Although the configuration having an effective configuration as the needle receiving device has been described, this needle receiving swing mechanism may be provided separately from the cloth feed swing mechanism.

  In addition to the double chain stitch sewing machine, the present invention provides similar operations and effects when applied to a flat stitch sewing machine. Further, it is particularly effective for a multi-needle sewing machine, but may be applied to a single-needle sewing machine.

  1 is an external perspective view of a multi-needle double chain stitch cylinder type sewing machine to which a needle receiving device for a sewing machine according to the present invention is applied.   It is a disassembled perspective view of the cloth feeding rocking | fluctuation mechanism and needle receiving rocking | fluctuation mechanism arrange | positioned in the cylinder bed of a sewing machine same as the above.   It is a top view of the principal part which shows the assembly | attachment state of both rocking mechanisms same as the above.   FIG. 4 is a right side view of FIG. 3.   It is an enlarged partial notch front view of the principal part seen from the cylinder bed front of a sewing machine same as the above.   It is a right view of the principal part which shows one operation state of the needle | hook and needle receiving member in a sewing machine same as the above.   It is an enlarged perspective view of the principal part explaining the optimal configuration of the needle receiving member when applied to a multiple (three) needle sewing machine and the needle receiving guide operating state when the looper intersects the right needle.   It is an expansion perspective view of the principal part explaining the optimal structure of a needle receiving member at the time of applying to a multiple (3) needle sewing machine same as the above, and the needle receiving guidance operation state when a looper crosses a middle needle.   It is an enlarged perspective view of the principal part explaining the optimal structure of the needle receiving member when applied to a multiple (three) needle sewing machine and the state of the needle receiving guiding operation when the looper crosses the left needle.   It is an expansion perspective view of the principal part which shows other embodiment of the needle receiver of the sewing machine which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 7 ... Sewing machine spindle, 9 (9R, 9C, 9L) ... Needle, 11 ... Front cloth feeding base, 12 ... Rear cloth feeding base, 13 ... Needle receiving base, 15 ... Needle receiving member, 34 ... Looper

Claims (5)

A needle thread loop that reciprocates up and down in conjunction with the rotation of the sewing machine spindle and reciprocally swings so as to draw an elliptical locus in a direction perpendicular to the sewing progressing direction in synchronization with the up and down reciprocation of the needle. A looper that captures the seam to form a seam, a cloth feed dog that feeds the cloth in the direction of sewing in synchronization with the reciprocating motion of the needle, and a needle that forms a seam in cooperation with the looper. A needle receiving device of a sewing machine comprising a needle receiving member that contacts and guides the movement of the needle,
A needle for a sewing machine, characterized in that a needle receiver swinging mechanism is provided for swinging the needle receiver member horizontally and vertically so as to give the needle receiver member a horizontal motion and a vertical motion along the sewing progress direction. Receiving device.   The needle receiver swinging mechanism is integrated into a cloth feed swinging mechanism that swings the cloth feed base horizontally and vertically so as to give the cloth feed teeth horizontal and vertical movements along the sewing progress direction. The needle receiver for a sewing machine according to claim 1.   The needle receiver swinging mechanism is provided separately from the cloth feed swinging mechanism that swings the cloth feed base horizontally and vertically so as to give the cloth feed teeth horizontal movement and vertical movement along the sewing progress direction. The sewing machine needle receiver according to claim 1.   The sewing machine according to any one of claims 1 to 3, wherein the needle receiver swinging mechanism is provided with a momentum adjusting mechanism capable of adjusting a horizontal and vertical combined momentum along a sewing progress direction of the needle receiver member. Needle support device.   2. A plurality of the needles are juxtaposed in a direction orthogonal to the sewing progress direction, and the looper is configured to reciprocate and swing across the juxtaposed needles. 5. A needle receiving device for a sewing machine according to any one of items 4 to 4.

Images