JP2004065843A - Fabric supporting plate for sewing in sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fabric supporting plate for sewing in a sewing machine which can realize a sewing pattern wherein a skipping stitch does not occur. <P>SOLUTION: On a throat plate 21, a needle passing hole 27 which allows a vertical movement of a needle 24 between an top dead center position and a bottom dead center position is formed. Also, at a location on a pressor 22 corresponding to the needle passing hole 27 of the throat plate 21, a through-hole which allows the vertical movement of the needle 24 is formed, and in the through-hole, a fitting member 51 on which a needle passing hole is formed is fitted. Respective needle passing holes 27 are formed in such a manner that the opening diameter of the lower end side opening is made smaller than the opening diameter of the upper end side opening, and the shape of a vertical section profile has a tapered shape which is narrower on a side closer to the lower end side. Therefore, the needle 24 which is passed through the needle passing holes 27 is positioned to the center of the needle passing holes 27 by being guided by the inner peripheral surface of the needle passing holes 27. At the same time, a positional slip of the needle 24 is restricted by the lower end side opening of the needle passing holes 27. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cloth support plate for sewing in a sewing machine such as a quilting machine.
[0002]
[Prior art]
Conventionally, in a sewing machine such as a quilting machine, a needle plate (a type of cloth supporting plate for sewing) is fixed to a sewing machine portion, and a holding plate (a type of cloth supporting plate for sewing) is provided above the needle plate. It is supported so that it can move up and down. Further, the needle plate and the holding plate are each formed with a needle insertion hole having the same inner diameter in the axial direction so as to correspond to the position. When the sewing cloth is fed between the needle plate and the presser plate while being sent out, the needle through which the upper thread passes is at the upper dead point where the needle passes above the presser plate and the lower dead position where the needle passes below the needle plate. By passing through each of the needle insertion holes to and from the point position, the needle moves up and down to form a desired sewing pattern on the sewing cloth.
[0003]
[Problems to be solved by the invention]
However, recently, in order to respond to the demand for shortening the sewing time, the cloth feeding speed in the sewing machine has been significantly increased more than before. For example, taking the rotation speed of the drive shaft in the cloth feeding mechanism as an example, in the case of the standard specification for feeding the cloth for sewing with a normal thickness, the rotation speed is increased from the conventional 500 rpm to 1200 rpm in recent years. ing. In addition, in order to respond to the demand for diversification of sewing patterns, the sewing cloth sent at the time of sewing should be moved in small increments while maintaining the expanded state not only in the front and rear direction along the cloth feeding direction but also in the left and right direction. Has been done. Therefore, when the needle which moves up and down between the top dead center position and the bottom dead center position during sewing is particularly pierced through the cloth, the needle is moved at a high speed in small amounts in the horizontal direction. May be displaced by being pulled. Such positional deviation of the needle breaks the relative positional relationship with the looper (or shuttle) at the bottom dead center position below the needle plate, and as a result, the sewing pattern is skipped, resulting in a product loss. Was produced.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sewing cloth support plate for a sewing machine that can realize a sewing pattern without skipping.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1, which relates to a sewing cloth support plate in a sewing machine, comprises a support plate which abuts on a sewing cloth transferred in a predetermined direction during sewing to support the cloth. A needle that allows a needle that moves up and down between a top dead center position above the support plate portion and a bottom dead center position below the support plate portion to pass through the support plate portion In the sewing cloth support plate in a sewing machine having an insertion hole, the gist is that the needle insertion hole is configured such that the opening size of the lower end side opening is smaller than the opening size of the upper end side opening. .
[0006]
Also, the invention according to claim 2 is the sewing cloth support plate of the sewing machine according to claim 1, wherein the needle insertion hole has a cross-sectional shape cut by a plane passing through a central axis of the insertion hole. The gist is that the tapered shape is tapered toward the lower end.
[0007]
Also, the invention according to claim 3 is a sewing cloth support plate for a sewing machine according to claim 1 or 2, wherein a through-hole is formed in the support plate portion, and the through-hole is formed in the through-hole. The gist is that the needle insertion hole is formed in the fitted fitting member.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a cloth support plate for sewing in a quilting machine embodying the present invention will be described with reference to FIGS.
[0009]
FIG. 1 is a schematic configuration diagram of a quilting machine 10 according to the present embodiment. As shown in the figure, a medium cloth 11 made of a thin sheet of cotton is arranged at one end of a quilting machine 10 in a state wound in a roll shape. The middle cloth 11 passes through a plurality of feed rollers 12 arranged at a predetermined interval in the center of the quilting machine 10 and a winding unit 13 located at the other end of the quilting machine 10, The quilting machine 10 is fed to a product receiving unit (not shown) provided at the other end. The lower fabric 14 is fed from the lower surface side of the middle fabric 11 by the feed roller 12 and sent to the product receiving unit via the winding unit 13. The upper cloth 15 is fed from the upper surface side of the middle cloth 11 by the feed roller 12 and sent to the product receiving section via the winding section 13. In the present embodiment, the middle cloth 11, the lower cloth 14, and the upper cloth 15 each correspond to a sewing cloth.
[0010]
A sewing machine 16 is provided between the feed roller 12 and the winding unit 13, and the lower fabric 14, the middle fabric 11, and the upper fabric 15 fed from the feed roller 12 are sewn in a joined state. (Sewing) to process into quilting (product). As shown in FIGS. 2 and 3, the sewing machine 16 is inserted into a needle plate (a sewing cloth support plate) 21, a holding plate (a sewing cloth support plate) 22, and a needle thread (a needle thread) 23. A needle 24 that moves and a looper 26 that moves forward and backward by inserting a lower thread (looper thread) 25 is provided. The needle plate 21 is a flat plate made of aluminum fixed horizontally to the sewing machine 16, and constitutes a support plate portion for supporting the entire needle plate 21 in contact with the sewing cloth such as the middle cloth 11 from below. are doing. As shown in FIG. 2, the needle plate 21 is provided with a pair of front and rear needle insertion holes 27 at a predetermined distance in the fabric feeding direction, in a direction perpendicular to the fabric feeding direction (see FIG. 1 and FIG. 2). A plurality are formed at equal intervals in a direction (perpendicular to).
[0011]
As can be understood from FIG. 2, the needle insertion hole 27 has a cross-sectional shape (hereinafter, also referred to as a “vertical cross-sectional shape”) cut along a plane passing through the central axis of the needle insertion hole 27, at the lower end side. The taper shape is gradually tapered. That is, each of the needle insertion holes 27 has a diameter of the lower end side opening 27b closer to the lower dead center position of the needle 24 than the opening diameter of the upper end side opening 27a closer to the upper dead center position of the needle 24. Are formed to have a small diameter. Incidentally, in the present embodiment, the opening diameter of the upper end side opening 27a is set to 4.5 mm, and the opening diameter of the lower end side opening 27b is set to 3.5 mm.
[0012]
As shown in FIG. 2, the holding plate 22 includes a pair of front and rear guide plates 41 made of aluminum and having a substantially channel-shaped cross section orthogonal to the longitudinal direction. And a long plate-shaped connecting plate 43 connected through the connecting plate. As shown in FIG. 4, a plurality of through holes 45 are formed in the bottom wall portion (support plate portion) 44 of each guide plate 41 at positions corresponding to the needle insertion holes 27 of the needle plate 21. A fitting member 51 shown in FIG. 5 is fitted into each of the through holes 45. A screw hole 47 into which the screw 42 is screwed is formed in the upper wall portion 46 of each guide plate 41.
[0013]
Each of the fitting members 51 is made of steel, and a tubular portion 52 that is press-fit into the through hole 45 of the bottom wall portion 44 of the guide plate 41 from below, and the tubular portion 52 is fitted into the through hole 45. And a flange portion 53 that comes into contact with the lower surface of the bottom wall portion 44 in the closed state. A needle insertion hole 54 that allows the needle 24 to pass in the axial direction is formed through the cylindrical portion 52 of the fitting member 51.
[0014]
As can be understood from FIG. 5, the needle insertion hole 54 has a cross-sectional shape (vertical cross-sectional shape) cut by a plane passing through the central axis of the needle insertion hole 54, as the lower end side closer to the flange portion 53. It has a tapered shape. That is, each needle insertion hole 54 is formed such that the opening diameter of the lower end side opening 54b is smaller than the opening diameter of the upper end side opening 54a. Incidentally, in the present embodiment, the opening diameter of the upper end side opening 54a is set to 5 mm, and the opening diameter of the lower end side opening 54b is set to 4 mm. The holding plate 22 configured as described above is located above the needle plate 21, and is supported by the holding material driving mechanism (not shown) from above to contact and support the upper material 15 constituting the sewing material at the time of sewing. The position is adjusted. The upper cloth 15, the middle cloth 11, and the lower cloth 14 are configured to cooperate with the needle plate 21 so as to sandwich a sewing cloth formed by superimposing.
[0015]
A large number of the needles 24 are arranged at positions corresponding to the needle insertion holes 27 and 54 in the needle plate 21 and the holding plate 22 by a needle driving mechanism (not shown) provided above the holding plate 22. The needle drive mechanism is configured to move up and down (reciprocate) between a top dead center position above the holding plate 22 and a bottom dead center position below the needle plate 21 by driving of the needle driving mechanism. . Further, a threading hole 24a is formed at the lower end of the needle 24, and the upper thread 23 supplied from a cheese (not shown) disposed at the upper part of the quilting machine 10 is inserted into the threading hole 24a. .
[0016]
The looper 26 is individually positioned so as to correspond to each needle insertion hole 27 formed in the needle plate 21 with respect to a looper shaft 28 (see FIG. 1) rotatably installed below the needle plate 21. Fixed. When the looper shaft 28 reciprocates in accordance with the vertical movement of the needle 24 based on the driving force of a drive source (not shown), the blade portion 29 moves one side of the vertical movement path of the needle 24 in the fabric feeding direction. It is configured to move forward and backward along the longitudinal direction. A threading hole 30 is formed through the blade portion 29 of the looper 26, and the lower thread 25 is inserted through the threading hole 30.
[0017]
A spreader (not shown) is provided at a front position below the needle plate 21 and substantially facing the looper 26. The spreader extends from the threading hole 30 of the looper 26 when the needle 24 starts to descend from the top dead center position to the bottom dead center position by piercing each of the fabrics 15, 11, and 14. The loop 31 of the upper thread 23 captured by the thread 25 and the blade portion 29 of the looper 26 is temporarily locked to repeat a predetermined closed loop movement.
[0018]
Next, the operation of the sewing cloth support plate (the needle plate 21 and the holding plate 22) in the quilting machine 10 according to the present embodiment configured as described above will be described.
By the way, at the time of sewing, various sewing patterns such as double chain stitching are performed on the sewing cloth obtained by superimposing the upper cloth 15, the middle cloth 11 and the lower cloth 14 by cooperation of the needle 24, the looper 26 and the spreader. (Stitch) is formed. That is, when the needle 24 starts ascending from the bottom dead center position, a loop 31 of the upper thread 23 is formed on one side of the needle 24 that is being raised near the bottom dead center position (see FIG. 3). Then, the loop of the upper thread 23 is captured by the blade portion 29 of the looper 26 that moves forward from the retracted position. Further, when the needle 24 descends from the top dead center position, the lower thread 25 and the thread of the upper thread 23, which are locked by the spreader which moves in a closed loop and are pulled in the lateral direction, are formed by the blade portion 29 of the looper 26. The needle 24 is lowered into the triangular space to be formed, and as a result, the upper thread 23 and the lower thread 25 are looped by other threads.
[0019]
During such a series of operations, when the needle 24 moves from the top dead center position to the bottom dead center position (see FIG. 2), the needle 24 also vibrates due to the vibration accompanying the operation of the quilting machine 10 and the like. May move out of the vertical movement path. However, in the present embodiment, the vertical cross-sectional shape of the needle insertion hole 54 of the fitting member 51 press-fitted into the holding plate 22 has a tapered shape that tapers toward the lower end. Therefore, even when the needle 24 is displaced during the lowering operation from the top dead center position to the bottom dead center position, the lower end of the needle 24 is guided by the inner peripheral surface of the needle insertion hole 54. It is centered on the center of the needle insertion hole 54.
[0020]
Further, depending on the type of the set sewing pattern (seam pattern), the sewing cloth composed of the cloths 15, 11, and 14 is not limited to the normal cloth feeding direction, that is, the front and rear direction, but also the cloth feeding direction such as the left and right direction. May be moved in small increments while maintaining the extended state in the direction intersecting with. Therefore, in such a case, the needle 24 that is about to pierce the sewing cloth and pass through the needle insertion hole 27 of the needle plate 21 is transmitted from the sewing cloth in small increments in the left-right direction and the like. , The needle 24 vibrates, causing a positional shift. However, in the present embodiment, the needle insertion hole 27 through which the needle 24 passes has a vertical cross-sectional shape that tapers toward the lower end. Therefore, even if the needle 24 is likely to be displaced immediately after the needle 24 pierces each of the fabrics 15, 11, and 14, the lower end of the needle 24 is guided by the inner peripheral surface of the needle insertion hole 27. It is centered on the center of the needle insertion hole 27.
[0021]
Further, when the lower end of the needle 24 moves up and down near the bottom dead center position below the needle plate 21, the inner diameter of the needle insertion hole 27 is formed as small as 3.5 mm. Vibration and displacement are well regulated by the opening edge of the side opening 27b. That is, during the lowering operation to the bottom dead center position, the relative positional relationship between the looper 26 and the blade portion 29 is well maintained, and the lower thread 25 and the upper thread 23 locked by the spreader and pulled in the lateral direction are maintained. The needle 24 does not fall out of the triangular space surrounded by the loop or the like. Also, during the ascent operation from the bottom dead center position, the relative positional relationship between the looper 26 and the blade portion 29 is kept good, and the loop of the upper thread 23 formed on one side of the needle 24 is moved. The blade portion 29 of the forwardly moving looper 26 is accurately inserted.
[0022]
Therefore, according to the sewing cloth support plate in the sewing machine of the present embodiment, the following effects can be obtained.
(1) In the above embodiment, each of the needle insertion holes 27 and 54 in the needle plate 21 and the holding plate 22 has a smaller opening diameter of the lower end side openings 27b and 54b than the opening diameter of the upper end side openings 27a and 54a. Therefore, in particular, the needle 24 that is in the middle of the vertical movement in the vicinity of the bottom dead center position is less likely to vibrate or move. That is, even if the wiggle movement in the horizontal direction is transmitted from the sewing cloth such as the middle cloth 11 to the needle 24, the needle 24 is not vibrated or displaced by the lower end side openings 27b and 54b of the needle insertion holes 27 and 54. Be regulated. Therefore, the other thread looping of the upper thread 23 and the lower thread 25 is reliably performed, and a sewing pattern without skipping can be realized.
[0023]
(2) In the above embodiment, the vertical cross-sectional shape of the needle insertion holes 27 and 54 has a tapered shape tapering toward the lower end. Therefore, even if the needle 24 that moves downward from the top dead center position vibrates (positionally moves), the lower end of the needle 24 is guided by the inner peripheral surfaces of the needle insertion holes 27 and 54, and the needle insertion holes 27 and 54 are moved. The center is aligned in the center direction of 54. Therefore, it is possible to prevent the relative positional relationship between the needle 24 and the looper 26 from being broken, and to prevent the sewing pattern from skipping, thereby preventing product loss.
[0024]
(3) In the above embodiment, the fitting member 51 is fitted into the through hole 45 formed in the holding plate 22, and the needle insertion hole 54 is formed through the fitting member 51. Therefore, even if the fitting member 51 having the needle insertion hole 54 is broken or damaged for some reason, only the fitting member 51 needs to be replaced, and the entire holding plate 22 does not need to be replaced. Therefore, maintenance costs can be reduced.
[0025]
(4) In the above embodiment, the fitting member 51 is made of steel. Therefore, even if the needle 24 that moves up and down may come into contact with the inner peripheral surface of the needle insertion hole 54 in the fitting member 51, there is no risk of damaging the needle insertion hole 54, and as a result, the pressing plate 22 Can be used for a long time.
[0026]
The above embodiment may be changed to another example as described below.
In the above embodiment, the fitting member 51 is fitted into the through hole 45 formed in the holding plate 22 and the needle insertion hole 54 is formed in the fitting member 51. However, the fitting member 51 is omitted. Alternatively, the through hole 45 may be a needle insertion hole having a tapered vertical cross section.
[0027]
In the above embodiment, both the needle insertion hole 27 formed in the needle plate 21 and the needle insertion hole 54 formed in the fitting member 51 have a tapered vertical cross section, but only one may have a tapered shape. .
[0028]
In the above-described embodiment, the fitting member 51 having the needle insertion hole 54 is fitted into the through hole 45 formed in the holding plate 22. However, a through hole is formed in the needle plate 21 and the through hole has a longitudinal sectional shape. May be fitted with a fitting member having a tapered needle insertion hole.
[0029]
In the above embodiment, the upper fabric 15, the middle fabric 11, and the lower fabric 14 are polymerized as sewing fabrics. However, the present invention is not limited to this. For example, any two of the fabrics 15, 11, 14 may be polymerized. Alternatively, four or more doughs may be polymerized. Further, only one piece of cloth may be used as the cloth for sewing.
[0030]
In the above-described embodiment, steel is used as the material of the fitting member 51. However, the material is not limited to this, and even if the needle 24 comes into contact, a material having sufficient hardness that does not cause damage (for example, aluminum alloy, Titanium, titanium alloy, ceramic, etc.) may be used.
[0031]
In the above-described embodiment, aluminum is used as the material of the needle plate 21 and the holding plate 22. However, the material is not limited to this. For example, aluminum alloy (Al-Cu alloy, Al-Si alloy, Al-Mg alloy, etc.) ) Or materials such as titanium, titanium alloys, and ceramics.
[0032]
In the above embodiment, the diameter of the lower end side opening of the needle insertion hole 27 of the needle plate 21 is 3.5 mm, and the diameter of the upper end side opening is 4.5 mm. However, the present invention is not limited to this. What is necessary is just to be formed larger than the diameter of a side opening. Similarly, the diameter of the lower end side opening is 4 mm and the diameter of the upper end side opening is 5 mm, and the diameter of the upper end side opening is larger than the diameter of the lower end side opening. Just do it.
[0033]
In the above embodiment, the present invention according to the sewing cloth support plate is embodied in both the needle plate 21 and the holding plate 22 in the quilting machine 10, but the invention is embodied in only one of the needle plate 21 and the holding plate 22. You may.
[0034]
In the above-described embodiment, the sewing machine is embodied as the needle plate 21 or the like in the quilting machine 10 which is a kind of sewing machine. May be embodied in the sewing cloth support plate.
[0035]
Next, technical ideas that can be grasped from the above embodiment and other examples will be additionally described below.
The sewing material support plate in the sewing machine according to claim 3, wherein (a) the fitting member is formed of a material having a higher hardness than the support plate portion. According to the invention described in (a), even if the needle comes into contact with the inner peripheral surface of the needle insertion hole in the fitting member, there is an effect that the needle is hardly damaged.
[0036]
(B) The sewing cloth support plate in the sewing machine according to the above technical idea (a), wherein the fitting member is made of steel, and the support plate portion is made of aluminum or an aluminum alloy. According to the invention described in (b), in addition to the same effects as in the technical idea (a), the weight of the sewing cloth support plate can be reduced.
[0037]
【The invention's effect】
According to the present invention, it is possible to realize a sewing pattern in which skipping does not occur.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a quilting machine according to an embodiment.
FIG. 2 is a partial side cross-sectional view of a sewing machine part in which a needle is being lowered.
FIG. 3 is a partial side cross-sectional view of a sewing machine in which a needle is near a bottom dead center position.
FIG. 4 is a partial plan view of a holding plate.
FIG. 5 is a front view of a fitting member.
[Explanation of symbols]
Reference Signs List 11 medium cloth as sewing cloth 14 lower cloth as sewing cloth 15 upper cloth 21 as sewing cloth 21 needle plate as sewing cloth support plate 22 holding plate 24 as sewing cloth support plate 24 needles 27, 54 needles Insertion holes 27a, 54a Upper opening 27b, 54b Lower opening 45 Through hole 51 Fitting member

Claims (3)

A supporting plate portion that abuts on the sewing material to be transferred in a predetermined direction during sewing and supports the material; In a sewing cloth support plate in a sewing machine having a needle insertion hole that allows the passage of a needle that moves up and down between the bottom dead center position below,
A sewing cloth support plate for a sewing machine, wherein the needle insertion hole is configured such that an opening size of a lower end side opening is smaller than an opening size of an upper end side opening. The sewing cloth support plate according to claim 1, wherein the needle insertion hole has a tapered shape in which a cross-sectional shape cut along a plane passing through a center axis of the insertion hole is tapered toward a lower end side. The sewing machine according to claim 1 or 2, wherein a through hole is formed in the support plate portion, and the needle insertion hole is formed in a fitting member fitted in the through hole. Dough support plate.

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