Patent Grant
10676848
The present invention relates to a sewing machine needle clamping device, and particularly relates to the sewing machine needle clamping device for attaching, fixing or exchanging a sewing machine needle of such as a lock stitch sewing machine, a serger, a double chain stitch sewing machine, or a cover stitch sewing machine to a needle clamp firmly and easily.
Conventionally, in the lock stitch sewing machine, the serger, the double chain stitch sewing machine, or the cover stitch sewing machine, etc., it is well known that a cloth which should be sewed is sandwiched between a throat plate and a presser foot which is pressed by a presser bar and is fed stitch by stitch by a feed dog mechanism, and stitches are formed on the cloth by the sawing machine needle and a shuttle hook or a looper as a loop capturing device.
In the meantime, the shuttle book or the looper as the loop capturing device and the feed dog mechanism are driven by each drive mechanism from a lower shaft which is a drive shaft. On the other hand, the swing machine needle is screwed by a screw to the needle clamp which is attached to the needle bar which is driven with an upper shaft which is transferred from the lower shaft by a lower shaft pulley, a timing belt and an upper shaft pulley (cf: Patent document Nos. 1-4).
However, in such the sewing machine needle clamping device, on the one hand, while holding a sewing machine needle shank at an attaching position of vertical direction in an inside of the needle clamp, on the other hand, it is necessary to screw the sewing machine needle by the screw to the needle clamp by joining and holding an attaching flat surface which is provided on a peripheral surface of the sewing machine needle shank to an attaching flat surface of the inside of the needle clamp. In this case, an operation which is necessary to screw one or multiple sewing machine needles by the screw to each needle clamp by joining and holding to the attaching flat surface of the inside of the needle clamp firmly by a screwdriver is a complicated work for operators of the sewing machine.
The present invention was conducted to solve these disadvantages. The object of the present invention is to provide the sewing machine needle clamping device that such the operation which has to screw the sewing machine needle by the screw to the needle clamp firmly by a screwdriver is unnecessary and the mechanism is simplified and the operation is performed by one-touch operation and the sewing machine needle of the sewing machine is attached and fixed to the needle clamp firmly and easily.
In order to achieve such the objects, a sewing machine needle clamping device of the present invention for attaching a sewing machine needle to an accommodating recessed part of a needle clamp comprises the needle clamp which has,
the clamp an has a force acting locking part, which moves around on a peripheral surface of the needle shank of the sewing machine needle against the elasticity of the needle clamp spring when swinging the clamp lever to a clamping direction in the state that the needle shank of the sewing machine needle is engaged to the accommodating recessed part and butted against an attaching position of a vertical direction, and passes a branch point position that the elasticity of the needle clamp spring becomes maximum, and holds a stable clamping state by the elasticity of the needle clamp spring, and
a cam is provided in the needle clamp, a cam, follower which engages to the cam is provided in the clamp arm, and
the elongate hole has three surfaces that the can follower climbs over the cam and moves as a movement path of the clamp lever shaft which becomes a rotation center of the clamp lever.
Besides, in the sewing machine needle clamping device of the present invention, a lock piece is provided in the needle clamp movably in a direction which is perpendicular to the direction of an axis of the needle, and a lock piece stopper which guides the lock piece to a direction, which is perpendicular to a direction of an axis of the sewing machine needle is provided, a clamp stopper which prevents the opening of the clamp lever by locking to the lock piece when closing the clamp lever is provided in the clamp lever, and a lock release button which releases the lock of the lock piece and the clamp stopper when opening the clamp lever is provided in the clamp lever.
Besides, a sewing machine needle clamping device of the present invention for attaching a sewing machine needle to an accommodating recessed part of a needle clamp comprises the needle
the clamp arm has a force acting locking part, which moves around on a peripheral surface of the needle shank of the sewing machine needle against the elasticity of the needle clamp spring when swinging the clamp lever to a clamping direction in the state that the needle shank of the sewing machine needle is engaged to the accommodating recessed part and butted against an attaching position of a vertical direction, and passes a branch point position that the elasticity of the needle clamp spring becomes maximum, and holds a stable clasping state by the elasticity of the needle clamp spring, and
the needle clamp which attaches the sewing machine needle is formed in an inner shape which adjusts to the needle shank or an outer shape of the needle to prevent that the needle slips out of the needle clamp when the needle penetrates into a cloth and then the needle come out of the cloth.
Besides, in the sewing machine needle clamping device of the present invention, a needle clamp forgetting prevention spring which repels elastically the needle to a direction that the needle separates from the accommodating recessed part is provided in the needle clamp which attaches the sewing machine needle when the clamp lever is opened.
Besides, in the swing machine needle clamping device of the present invention, an attaching hole which adjusts to a D-shaped cross-sectional shape including an attaching flat surface of an upper end of the needle shank of the sewing machine needle is formed to be able to attach the sewing machine needle at the time of a direction of the attachment of the needle where the attaching flat surface of the needle shank is joined to the attaching flat surface of the accommodating recessed part in the needle clamp which attaches the sewing machine needle.
According to a sewing machine needle clamping device of the present invention, this device can provide the basic merits that the mechanism is simplified and the operation is performed by one-touch operation of small number of times, and the sewing machine needle of such as the lock stitch sewing machine, the merger, the double chain stitch sewing machine, or the cover stitch sewing machine can be attached, fixed or exchanged to the needle clamp firmly and easily.
According to the sewing machine needle clamping device of the present invention, in addition to the above basic merits, when the sewing machine needle is clamped, the wear-out due to the engagements of many times of the needle shank face that a maker name of the sewing machine needle and an engraved mark are engraved and a force acting locking part face of the clamp arm is eliminated, and the sewing machine needle can be clamped to the needle clamp certainly.
According to the sewing machine needle clamping device of the present invention, in addition to the above basic merits, when the clamp lever is closed, the clamp lever is opened by the unintentional movement in the lateral direction and the back-and-forth direction of the needle and the malfunction that claming of the needle is released occurs, and this device can function as a safety device which prevents that the sewing machine needle breaks and disperses by the collision with other parts.
According to the sewing machine needle claiming device of the present invention, in addition to the above basic merits, when the sewing machine needle penetrates into the cloth that the needle is hard to pierce in other words, when the sewing machine needle penetrates into the cloth which has the large friction and then the sewing machine needle come out of the cloth, this device can prevent that the sewing machine needle slips out of the needle clamp by the frictional force with the cloth.
According to the sewing machine needle clamping device of the present invention, in addition to the above basic merits, when the needle is attached to the needle clamp, the safety device which does not drop the sewing machine needle is provided. On the other hand, when the clamp lever is opened, prevention to forget clamping can be attempted because the sewing machine needle drops from the accommodating recessed part.
According to the sewing machine needle clamping device of the present invention, in addition to the above basic merits, the sewing machine needle can be attached to the accommodating recessed part only when a direction of the sewing machine needle where the attaching flat surface of the needle shank is joined to the attaching flat surface of the accommodating recessed part is attached, and the attachment awl be performed certainly.
Hereinafter, the Some preferable embodiments that the oaring machine needle clamping device of the present invention is applied to a 2 (two) needles 4 (four) threads serger (hemstitch sewing machine) are explained in detail by referring to the drawings.
As she in
This looper 44 as the loop capturing device and the feed dog mechanism are driven by each drive mechanism from the lower shaft 46 which is the drive shaft. On the other hand, the sewing machine needle 3 is fixed to the needle clamp 5 which is attached to the needle bar 58 which is driven by a needle bar drive mechanism 56 with the upper shaft 54 which is transmitted from the lower shaft 46 with rotation ratio of 1:1 by the lower shaft pulley 48, the timing belt 50 and the upper shaft pulley 52. The upper shaft 54 and the needle bar drive mechanism 56 are attached to a sewing machine arm. The throat plate 42, the looper 44 as the loop capturing device and the feed dog mechanism are attached to a sewing machine bed.
According to such the 2 needles and 4 threads hemstitch sewing machine (serger) 40, the cloth which should be sewed is sandwiched between the throat plate 42 and the presser foot which is pressed by the presser bar and is fed stitch by stitch by the feed dog mechanism, and stitches are formed on the cloth by the sewing machine needle 3 and the looper 44 as the loop capturing device. However, because the number, the specific structure and the operation of the throat plate 42 and the looper 44 as the loop capturing device for forming the stitches are public known or well known, the detailed explanations are omitted.
As shown in
In two sewing machine needles 3, an end face of the shark of the needle shank 15 is butted against different attaching position of vertical direction in the inside of the needle clamp 5 respectively and an attaching flat surface 15a which is provided at the peripheral surface of the needle shank 15 of the sewing machine needle 3 is joined to an attaching flat surface 7a of the accommodating recessed part 7 in the inside of the needle clamp 5.
The needle clamp 5 has a clamp lever 19 which is freely opened and closed and is fixed to a clamp lever shaft 17 which is pivotally attached to an elongate hole 13b which is bored at an attaching portion 13a which is provided up and down in the attaching base 13 of the needle clamp 5 for the accommodating recessed part 7. When the clamp lever shaft 17 is pivotally attached in the elongate hole 13b, it can pivotally move, and is stopped so that it cannot move in the vertical direction. An elongate direction of the elongate hole 13b is same direction as a straight line L2 which links a central point N of the needle shank 15 of the sewing machine needle 3 which is accommodated in the accommodating recessed part 7 of the needle clamp 5 and a central point P of the clamp layer shaft 17 (
In addition, the elongate hole 13b is formed in a deformed elongate hole and has three surfaces 13d, 13e, 13f that the cam follower 70 climbs over the cam 71 and moves as the movement path of the clamp lever shaft 17 which becomes the rotation center P of the clamp lever 19 (
Besides, the needle clamp 5 has a plate-like needle clamp spring 23 which repels elastically the clamp lever 19 to an outer direction of the straight line which links the central point N of the needle shank 15 of the sewing machine needle 3 and the central point P of the clamp lever shaft 17.
In the sewing machine needle clamping device 1, the clamp arm 21 has a force acting locking part 22,
which moves around without contacting on the peripheral surface of the needle shank 15 of the sewing machine needle 3 against the elasticity of the needle clamp spring 23 when swinging the clamp lever 19 to a clamping direction “a” (
which passes a branch point position tp (
which holds a stable clamping state by the elasticity of the needle clamp spring 23.
According to the sewing machine needle clamping device 1 of the present invention which is composed in this way, in the State before clamping the sewing machine needle 3 to the needle clamp 5 the needle shank 15 of the sewing machine needle 3, the clamp lever shaft 17 of the needle clamp 5 and the clamp arm 21 of the clamp lever 19 are positional relations shown in
According to the sewing machine needle clamping device 1 of the present invention, for example, the end face of the shank of the needle shank 15 of the sewing machine needle 3 is butted against different attaching position of vertical direction in the inside of the needle clamp 5 and the attaching flat surface 15a which is provided at the peripheral surface of the needle shank 15 of the sewing machine needle 3 is joined to the attaching flat surface 7a of the accommodating recessed part 7 in the inside of the needle clamp 5 by left hand and in the state immediately after clamping the clamp lever 13 to the clamping direction “a” by right hand, the clamp lever shaft 17 is repelled elastically and pressed to a hole surface of outside direction of the elongate hole 13b in the direction of the straight line which links the central point N of the needle shank 15 of the sewing machine needle 3 and the central point P of the clamp lever shaft 17 by the needle clamp spring 23 (
According to the sewing machine needle clamping device 1 of the present invention, the end face of the shank of the needle shank 15 of the sewing machine needle 3 is butted against the attaching position of the vertical direction in the inside of the needle clamp 5 and the attaching flat surface 15a which is provided at the peripheral surface of the needle shank 15 of the sewing machine needle 3 is joined to the attaching flat surface 7a of the accommodating recessed part 7 in the inside of the needle clamp 5, and in the state after further continuing the clamping operation of the clamp lever 19 to the direction of the arrow “a”, the tip 21a of the clamp arm 21 of the clamp lever 19, that is the force acting locking part 22 resists elastic repulsion of the needle clamp spring 23 for climbing over the needle shank 15 of the sewing machine needle 3 and moves to the direction of the needle shank 15 of the sewing machine needle 3 in the inside of the elongate hole 13b (
According to the sewing machine needle clamping device 1 of the present invention, in the state that the end face of the shank of the needle shank 15 of the sewing machine needle 3 is butted against the attaching position of the vertical direction in the inside of the needle clamp 5, the attaching flat surface 15a which is provided at the peripheral surface of the needle shank 15 of the sewing machine needle 3 is joined to the attaching flat surface 7a of the accommodating recessed part 7 in the inside of the needle clamp 5 and completed the clamping operation of the clamp lever 19 to the direction of the arrow “a”, in other worded in the clamping state, if the tip 21a of the clamp arm 21 of the clamp lever 19, that is, if the force acting locking part 22 climbs over the branch point position tp that elastic force of the needle clamp spring 23 becomes maximum, the curvature of the needle shank 15 of the sewing machine needle 3 and the curvature of the clamp arm 21 of the clamp lever 19 are corresponding, thereby the clamp lever shaft 17 returns toward the hole surface of outside direction of the elongate hole 13b in the direction of the straight line which links the central point N of the needle shank 15 of the sewing machine needle 3 and the central point P of the clamp lever shaft 17, and the central point C of the engagement surface 21b of the clamp arm 21 and the central point N of the needle shank 15 of the sewing machine needle 3 are corresponding (
in the abovementioned swing machine needle clamping device 1, when the sewing machine needle is clamped, surface friction of each other is caused due to the engagements of many times of the face of the needle shank 15 that the maker name of the sewing machine needle 3 and the engraved mark are engraved and the convex part of the force acting locking part 22 of the clamp arm 21 and due to the difference between the material s of both at the time of the engagement, eventually, there is a possibility that the sewing machine needle 3 cannot be clamped to the needle clamp 5 certainly.
In the sewing machine needle clamping device 1 of the present invention, in order to eliminate the abovementioned disadvantages, as a premise, as mentioned above, the needle clamp 5 has the clamp lever 19 which is freely opened and closed for the accommodating recessed part 7 and is fixed to the clamp lever shaft 17 which is pivotally attached to the elongate hole 13b which is bored at the attaching portion 13a which is provided up and down in the attaching base 13 of the needle clamp 5. The clamp lever 19 has a clamp arm 21 which moves around without contacting on the peripheral surface of the needle shank 15 of the sewing machine needle 3. The clamp arm 21 has the force acting locking part 22, which moves around without contacting on the needle shank 15 of the sewing machine needle 3 against the elasticity of the needle clamp spring 23 when swinging the clamp lever 19 to a clamping direction “a” (
Besides, as shown in
In this case, the above force acting locking part 22 passes, and the branch point position tp where the elasticity of the needle clamp spring 23 which holds the stable clamping stately the elasticity of the needle clamp spring 23 becomes maximum is a contact point between the cam follower 70 and the cam 71 when the central point P3 in the elongate hole 13b and the central point P of the clamp lever shaft 17 correspond. However, practically, to allow that the claw lever shaft 17 moves smoothly, the central point P3 is provided with, a certain clearance L3 toward the central point N from the central point P on the straight line L2 linking the central point N of the needle shank 15 and the central point P of the clamp lever shaft 17 (
In this sewing machine needle clamping device 1, when swinging the clamp lever 19 at the time of clamping the sewing machine needle 3, till the state after continuing further clamping the sewing machine needle 3 to the needle clamp 5 via the state immediately after clamping the sewing machine needle 3 to the needle clamp 5 from the state before clamping the sewing machine needle 3 to the needle clamp 5, as the movement path of the clamp lever shaft 17 which becomes the rotation centers P1, P2 of the clamp lever 19 of the elongate hole 13b, the clamp lever shaft 17 moves the two surfaces 13d, 13e (
According to this sewing machine needle clamping device 1, this device can provide the basic merits that the mechanism is simplified and the operation is performed by one-touch operation of small number of times, and the sewing machine needle of such as the lock stitch sewing machine, the merger, the double chain stitch sewing machine, or the cover stitch sewing machine cam be attached, fixed or exchanged to the needle clamp firmly and easily, and in addition to the above basic merits, when the sewing machine needle is clamped, the wear-out due to the engagements of many times of the needle shank face that a maker name of the sewing machine needle and an engraved mark are engraved and a force acting locking part face of the clamp arm is eliminated, and the sewing machine needle can be clamped to the needle clamp certainly.
Besides, as shown in
When the clamp lever 19 places in the clamp position, the lock piece 72 is locked to the clamp stopper 74, and the clamp lever 19 cannot be released (
According to the sewing machine needle clamping device 1 of the present invention, in addition to the above basic merits, when the clamp lever 19 is closed, the clamp lever 19 is opened by the unintentional movement in the lateral direction and/or the back-and-forth, direction of the sewing machine needle 3 and the malfunction that clamping of the needle is released occurs, and this device can function as a safety device which prevents that the sewing machine needle 3 breaks and disperses by the collision to other parts.
Besides, as shown in
Generally, when the sewing machine needle 3 penetrates into the cloth that the needle is hard to pierce, and then the sewing machine needle 3 come out of the cloth, the force works in the direction which slips out from the needle clamp 5 by the frictional force with the cloth. Although the inner shape 77 of a taper groove of approximate shape with the shank taper 76 of the sewing machine needle 3 is provided in an outlet aide of a needle attaching groove of the needle clamp this is a taper shape which is clearance in the extent that a timing position that a needle eye position scoops a needle thread by a lower looper low-taker point does not influence even if the sewing machine needle 3 moves to the direction of slipping out.
According to the sewing machine needle clamping device 1 of the present invention, in addition to the above basic merits, when the sewing machine needle penetrates into the cloth that the needle is hard to pierce, in other words, when the sewing machine needle penetrates into the cloth which has the large friction, and then the sewing machine needle come out of the cloth this device can prevent that the sewing machine needle slips out of the needle clamp by the frictional force with the cloth.
Besides as shown in
As mentioned above, because the inner shape 77 of the taper groove of approximate shape with the shank taper 76 of the sewing machine needle 3 is provided as the taper for preventing the needle from slipping out in the outlet side of the needle attaching groove of the needle clamp 5, the sewing machine needle 3 does not fall off when attaching the sewing machine needle 3 to the needle clamp 5. Therefore, there is a possibility to forget a clamping operation. When the clamping operation is not performed, because the sewing machine needle 3 is pushed out in the direction which detaches from the taper groove by repelling elastically the sewing machine needle 3 from a back side of the sewing machine needle 3, the sewing machine needle 3 falls off.
According to the sawing machine needle clamping device 1 of the present invention, in addition to the above basic merits, when the sewing machine needle 3 is attached to the needle clamp 5, the safety device which does not drop the sewing machine needle 3 is provided. On the other hand, when the clamp lever 19 is opened, clamping forgetting prevention can be attempted because the sewing machine needle 3 drops from the accommodating recessed part 7.
Besides, as shown in
That is, in the direction of the attachment of the sewing machine needle 3, the shank surface becomes the needle clamp body side. In the attaching bole 80 of the needle clamp 5, because the portion where the upper end of the needle shank 15 enters becomes the D-shaped cross-sectional shape 79, in the case that the needle shank 15 is not a normal direction, as mentioned above, the sewing machine needle 3 cannot fit into the attaching hole 80 and the force acting locking part (clamp tip) 22 cannot also climb over the needle shank 15, thereby the clamping operation cannot be performed.
However, when the direction of the attaching flat surface 15a of the needle shank 15 of the sewing machine needle 3 is the position which is shown in
According to the sewing machine needle clamping device 1 of the present invention, in addition to the above basic merits, the sewing machine needle casaba attached to the accommodating recessed part only when the direction of the needle where the attaching flat surface of the needle shank is joined to the attaching flat surface of the accommodating recessed part is attached, and the attachment can be performed certainly.
As it is clear from the above explanation, according to the sewing machine needle clamping device of the present invention, the operation which has to screw the thin sewing machine needle by the screw to the needle clamp of small apace firmly by the screwdriver is unnecessary and the mechanism is simplified and the operation is performed by one-touch operation of small number of times, and the sewing machine needle such as the lock, stitch sewing machine, the serger, the double chain stitch sewing machine, or the cover stitch sewing machine can be attached, fixed or exchanged to the needle clamp firmly and easily, and when the clamp lever is closed, the clamp lever is opened by the unintentional movement in the lateral direction and the back-and-forth direction of the needle and the malfunction that clamping of the needle is released occurs, and this device can function as the safety device which prevents that the sewing machine needle breaks and disperses by the collision to other parts, and when the sewing machine needle penetrates into the cloth that the needle is hard to pierce, in other words, when the sewing machine needle penetrates into the cloth which has the large friction and then the sewing machine needle come out of the cloth, this device can prevent that the sewing machine needle slips out of the needle clamp by the frictional force with the cloth, and when the needle is attached to the needle clamp, the safety device which does not drop the sewing machine needle is provided. On the other hand, when the clamp lever is opened, the prevention to forget clamping can be attempted because the sewing machine needle drops from the accommodating recessed part, end the sewing machine needle can be attached to the accommodating recessed part only when the direction of the sewing machine needle where the attaching flat surface of the needle shelf is joined to the attaching flat surface of the accommodating recessed part is attached, and the attachment can be performed certainly.
Because the sewing machine needle is attached and fixed to the needle clamp firmly and easily, the sewing machine needle clamping device in the present invention can be applied suitably to various types of the sewing machine such as the lock stitch sewing machine, the serger, the double chain stitch sewing machine, or the cover stitch swing machine.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2017/030923 | 8/29/2017 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/043785 | 3/7/2019 | WO | A |
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|---|---|---|---|
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| 5143006 | Jimenez | Sep 1992 | A |
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| 7971544 | Hillenbrand | Jul 2011 | B2 |
| Number | Date | Country |
|---|---|---|
| S6226133 | Feb 1987 | JP |
| 2004-121280 | Apr 2004 | JP |
| 2007-151777 | Jun 2007 | JP |
