JP2003326036A - Presser foot operating device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a presser foot operating device of a sewing machine, which can simplify a mechanism by reducing the number of components, and can improve the operability of a knee pad while preventing a sense of incompatibility and discomfort from being given to an operator. <P>SOLUTION: A knee operation lever 35 is integrally composed of a lever part 35a to be fixed, an approximately U-shaped bent lever part 35b, and a linear knee pad-attached lever part 35c to which the knee pad 38 is attached; and a position, in which a pivot 29 for mounting the lever part 35a via a holder 32 is mounted on a lower part of an oil pan 7, is set so that a shaft center G of the lever part 35c can pass through the pivot 29 or a part near the pivot 29. Thus, since an orbit HK of movement of a right knee RH of the operator who operates the lever 35 almost corresponds to an orbit AK of movement of the knee pad 38, the amount of vertical displacement of the knee pad 38 with respect to the right knee RH is made extremely small in an operation for moving the knee pad 38, so that the sense of the incompatibility and the discomfort can be eliminated. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presser foot operating device for a sewing machine, and in particular, an operator operates a knee to laterally move a knee pad attached to a knee operating lever to raise the presser foot. Regarding

[0002]

2. Description of the Related Art A conventional presser foot operating device for a sewing machine will be described. As shown in FIG. 3, a vertically movable presser bar 108 is provided in an arm portion 103 of an industrial sewing machine M.
Is a push rod 123 supported by an oil pan 107 attached to the sewing machine table 105 so as to be vertically movable via a press rod holder 110 fixed to this middle portion in the height direction and a link mechanism 116 connected thereto. It is connected. The oil pan 107 corresponding to the immediate left side of the push rod 123.
A bearing boss 125 is projectingly provided on the lower surface of the bearing boss 125, and a pivot shaft 140 in the cloth feeding direction is rotatably supported by the bearing boss 125.

An upper end portion of a knee operating lever 135 having a substantially inverted V shape in a front view is fixed to the pivot shaft 140 via a holder 132, and a fixing metal member 137 is attached to a linear lower end portion of the knee operating lever 135. The knee pad 138 is fixed via the knee pad 138. Therefore, when the presser foot 109 presses the needle plate (not shown) of the bed portion 1 in the lowered state, the knee pad 138 and the knee operating lever 135 are located at the standby position indicated by the solid line, and the right knee RH of the operator is not supported. When the knee pad 138 and the knee operating lever 135 are moved to the operating position indicated by the chain double-dashed line by moving to the right, the presser foot 109 rises to a predetermined height position. Here, the code | symbol LH is a worker's left knee.

At this time, the right knee RH of the worker moves laterally around the foot on the floor along an arc having a large radius of curvature indicated by the movement locus HK, whereas the knee pad 13
8 is a knee rest movement locus A in which 8 moves from the standby position to the operating position
K has an arc shape with a small radius of curvature that descends greatly. Therefore, these different movement trajectories A
Due to K and HK, a vertical shift corresponding to the maximum separation distance h is generated, and a relative movement occurs between the right knee RH and the knee rest 138 corresponding to the vertical shift amount, which gives an uncomfortable feeling to the operator. Alternatively, continuous work over a long period of time may cause damage or scratches on the pants and right knee RH of the worker.

Therefore, in the knee operating device described in Japanese Utility Model Publication No. 62-15028, an upper end portion of a pair of left and right swing links is provided on an operating shaft provided at a lower end of an oil pan and a support shaft parallel to the operating shaft. Are fixed to each other, the lower ends of the pair of rocking links are connected by a connecting link, and the knee pad is fixed to the connecting link via an L-shaped rod so that the pressing operation surface of the knee pad is fixed. The vertical movement allows parallel movement in the horizontal direction to improve the operability of operating the presser foot with the knee.

In Japanese Utility Model Publication No. 62-15029, the upper end of the swing arm is fixed to an operating shaft provided at the lower end of the oil pan, and the guide member is provided downward at a position near the operating shaft. An arcuate groove cam is formed, and the reverse T
A pair of pins provided on the character-shaped moving member are respectively inserted and fitted, one end of the pin is connected to the lower end portion of the swing arm, and a knee pad is fixed to the moving member via an L-shaped rod. so,
By making the movement locus of the knee rest substantially coincide with the movement locus of the knee, the operability of operating the presser foot with the knee can be improved.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to Japanese Patent Laid-Open No. 028, although a pair of right and left swing links and a connecting link are used to allow parallel translation in the lateral direction while the pressing operation surface of the knee rest is held in the vertical state, knee operation is possible. As the device becomes more complicated, the locus of movement of the knee pad is still different from the locus of movement of the knee in the shape of an arc, and a large vertical deviation occurs between these loci of movement, which makes it impractical. There is a problem that not only the pants and the right knee are damaged or scratched, but also the worker feels uncomfortable or uncomfortable.

Further, in Japanese Utility Model Publication No. 62-15029, the knee rest is moved along an arcuate groove cam formed on the guide member so that the knee rest is approximated to the movement locus of the knee. Although it is possible to move with the knee, there are problems that the knee easily interferes with the moving member when the knee is moved laterally, the operability is poor, and the knee operating device is complicated. An object of the present invention is to provide a simple mechanism with a small number of parts, and to improve the operability of the knee rest without giving the operator a feeling of discomfort or discomfort.

[0009]

A presser foot operating device for a sewing machine according to a first aspect of the present invention comprises a pivot shaft provided below the sewing machine bed portion in parallel with the cloth feed direction, and a knee connected to the pivot shaft. A presser foot that has an operating lever and a knee pad fixed to the knee operating lever, and is attached to the lower end of the presser bar through the knee operating lever and a link mechanism connected to the knee operating lever by the lateral movement of the knee of the operator. In a presser foot operating device of a sewing machine that raises a foot, a center of a lower part of a bed is pivoted so that an axial center of a knee pad mounting lever part of a knee operating lever for mounting a knee pad passes through a pivot shaft or a portion in the vicinity thereof. The mounting position of the spindle is set.

The knee operating lever to which the knee pad is fixed is connected to a pivot shaft provided on the lower side of the sewing machine bed part, and the axis of the knee pad mounting lever part of the knee operating lever is the pivot shaft or Since the pivotal shaft mounting position on the lower side of the bed is set so as to pass through the vicinity, the knee pad is pivoted through the knee operating lever as the operator moves his knee laterally. When moving around the axis as the center of rotation, the knee rest does not greatly descend, and the posture of the knee rest can be stabilized so that the pressing operation surface of the knee rest faces the knee side. The operability of the presser foot operation by a person is improved.

According to a second aspect of the present invention, there is provided a presser foot operating device for a sewing machine according to the first aspect of the present invention, wherein the knee operating lever includes a fixed lever portion on an upper end side, and the fixed lever portion is pivoted via a holder. It is fixed to the spindle. In this case, the attachment position of the knee operating lever to the holder in the fixed lever portion can be finely adjusted according to the preference of the operator, and the operability of the knee rest can be further improved. Other than that, the same operation as in claim 1 is achieved.

In the presser foot operating device for a sewing machine according to a third aspect of the present invention, in the invention of the second aspect, the knee contact mounting lever portion and the fixed lever portion of the knee operating lever are provided with a substantially U-shaped bending lever portion. It is an integrated structure. In this case, by forming the knee support mounting lever part and the fixed lever part integrally by the bending lever part, the knee support such that the axis of the knee support mounting lever part passes through the pivot shaft or its vicinity. The operation lever can be easily and individually made. In addition, the same operation as that of the second aspect is achieved.

A presser foot operating device for a sewing machine according to a fourth aspect is the sewing machine according to any one of the first to third aspects, wherein a parallel link for transmitting an operating force from the pivot shaft to the link mechanism is provided. . In this case, since the pivot shaft can be arranged closer to the worker side by the amount of providing the parallel link, the knee rest comes closer to the right knee of the worker, and the operability of the knee rest is improved. It can be further improved. In addition, the same operation as in any one of claims 1 to 3 is achieved.

A presser foot operating device for a sewing machine according to a fifth aspect of the present invention is the presser foot operating device for a sewing machine according to any one of the first to fourth aspects, wherein the locus of movement of the knee of the operator and the movement of the knee pad when operating the knee operating lever The locus and the locus are configured so as to be approximately similar to each other. In this case, the maximum amount of deviation in the height direction due to the locus of movement of the knee and the locus of movement of the knee pad becomes very small, and the discomfort and discomfort felt by the operator can be eliminated, and the operability of the presser foot operation can be improved. Can be improved. In addition, the same operation as in any one of claims 1 to 4 is achieved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is a case where the present invention is applied to a presser foot operating device of an industrial sewing machine capable of forming various stitches. As shown in FIG. 1, the industrial sewing machine M has a bed portion 1, a pedestal portion 2 standing upright at the right end of the bed portion 1, and an upper portion of the pedestal portion 2 continuously extending leftward. On the sewing machine table 5 that is integrally provided with the arm portion 3 and is supported by a supporting foot (not shown),
It is mounted through a rectangular mounting hole 5a.

An oil pan 7 for receiving the lubricating oil 6 supplied to the sewing machine M is provided on the sewing machine table 5 so as to correspond to the lower side of the sewing machine M. Arm part 3
The vertical presser bar 8 disposed in the head 4 is vertically movably supported by the frame F, and the presser foot 9 is detachably attached to the lower end. A block-shaped presser bar retainer 10 is fixed to a middle portion of the presser bar 8 in the height direction, and a presser foot spring 12 is provided between the presser bar retainer 10 and a presser pressure adjusting screw 11 screwed to an upper frame F. Is installed. Therefore, due to the spring force of the cloth presser spring 12, the presser bar 8 is
It is always elastically biased downward.

Next, the presser foot operating device 15 will be described. First, the link mechanism 16 for moving the presser bar 8 up and down will be described. A first turning lever 17 provided close to the presser bar 8 is rotatably supported by a pivot pin 18 oriented in the front-rear direction, and a first arm portion 17a of the first turning lever 17 is provided.
Is connected to the presser bar hanger 10 from below. Pedestal part 2
The second rotation lever 19 disposed in the upper part of the inside of the table is rotatably supported by the pivot pin 20 in the front-rear direction.
The first arm portion 19a of the turning lever 19 and the first turning lever 17
2nd arm part 17b of is connected by the connecting rod 21.

The second arm portion 1 of the second turning lever 19
An upper end of a substantially crank-shaped presser bar 22 is connected to 9b. By the way, the push rod 23 is disposed in the insertion hole 7b formed in the bottom wall 7a of the oil pan 7 so as to be vertically movable. An enlarged portion 23a is formed at an upper end portion of the push rod 23, and the push rod 23 is prevented from falling due to the enlarged portion 23a. The upper surface of the enlarged portion 23a is formed in a concave shape, and is connected to the lower end of the presser bar 22 from below in a receiving state. Therefore, when the sewing machine M is tilted to the other side due to maintenance and inspection, the presser bar 22 can be tilted together with the sewing machine M, and the push bar 23 is always supported by the oil pan 7. .

A first bearing boss 25 is formed downward on the lower surface of the oil pan 7 to the immediate left of the push rod 23, and an operating shaft 26 in the front-rear direction is rotatably supported by the first bearing boss 25. There is. An oscillating member 27 is fixed to the operating shaft 26, and an operating piece 27a extending from the oscillating member 27 is in contact with the lower end of the push rod 23 from below. A second bearing boss 28 is formed downward on the lower surface of the oil pan 7 immediately to the left of the first bearing boss 25.
A pivot shaft 29 in the front-rear direction is rotatably supported by the pivot shaft 29, and a connecting member 30 (see FIG. 2) is fixed to the pivot shaft 29. The connecting member 30 and the swinging member 27 form a link 31.
Are connected by.

Here, the link 31, the swinging member 27, the connecting member 30 and the like constitute a parallel link, and the operating force is transmitted from the pivot shaft 29 to the link mechanism 16 by this parallel link. Therefore, since the pivot shaft 29 can be arranged closer to the worker by the amount of the parallel link, the knee rest 38 is closer to the right knee RH of the worker. A holder 32 is further fixed to the pivot 29, and the holder 3
2, the fixed lever portion 35 at the upper end of the knee operating lever 35
a is fixed by a fastening bolt 36. The linear knee rest mounting lever portion 35 below the knee operating lever 35
A knee pad (so-called pad) 38 is fixed to c by a fixing bracket 37 so that its position can be adjusted.

As shown in FIG. 2, the knee operating lever 35 has a bent lever portion 35 in which a fixed lever portion 35a at an upper end portion and a knee rest mounting lever portion 35c at a lower portion are substantially U-shaped.
It is constructed integrally via b. Therefore, the knee operating lever 35 in which the axis G of the knee pad mounting lever portion 35c passes through the pivot shaft 29 or a portion in the vicinity thereof can be easily created as a single body, and the knee pad 38 serves as the pivot shaft. It is located almost below 29. Therefore, when the presser foot 9 is pressed against the needle plate (not shown) of the bed 1, the knee pad 38 and the knee operating lever 35 are located at the standby position shown by the solid line.

When the operator's right knee RH is moved to the right and the knee operating lever 35 is moved to the operating position indicated by the chain double-dashed line via the knee rest 38, the presser foot 9 has a predetermined height. Ascend to position. At this time, the knee rest movement locus AK at which the knee rest 38 moves from the standby position to the actuation position is a substantially lateral direction, and is an arc shape that does not fluctuate significantly vertically. Here, the code | symbol LH is a worker's left knee.

Next, the operation and effect of the presser foot operating device 15 thus constructed will be described. When raising the presser foot 9 to set the work cloth (not shown) on the lower side of the presser foot 9, the worker moves the right knee RH to the right and moves the knee pad 38 to the right. As a result, the holder 32
Since the pivot shaft 29 and the connecting member 30 rotate counterclockwise, the swinging member 27 rotates counterclockwise via the link 31 and the push rod 23 is moved upward. As a result, the presser bar 8 moves upward via the link mechanism 16 as indicated by the arrow, and the presser foot 9 rises.

In this case, as shown in FIGS. 1 and 2, the right knee RH has a knee movement locus H with the foot on the floor (not shown) as the swing center.
Move right along K. Therefore, the knee movement locus HK is in the shape of an arc having a large radius of curvature so as to slightly descend from substantially horizontal. On the other hand, the knee rest movement trajectory AK of the knee rest 38 is an arc shape centered on the pivot shaft 29 located immediately above and to the right of the right knee RH. Since the mounting position of the pivot shaft 29 is set so that the shaft center of the lever portion 36c passes through the pivot shaft 29 or a portion in the vicinity thereof, the vertical fluctuation of the knee support movement locus AK is extremely small.

Therefore, as shown in FIG. 2, these two movement loci AK and HK are very close to each other, and the vertical shift amount is very small. Further, the posture of the knee rest 38 is stabilized so that the pressing operation surface of the knee rest 38 faces the right knee RH side. As a result, not only the operability of the presser foot operation by the worker is improved, but also the maximum displacement amount of the right knee RH of the worker with respect to the knee pad 38 in the height direction becomes extremely small, which may cause discomfort to the worker. The discomfort can be eliminated, and the operability of the presser foot operation can be improved. Further, the presser foot operating device 1
5 can have a simple structure in which only the second bearing boss 28 and the parallel link are additionally provided on the lower side of the oil pan 7.

Next, a modification of the above embodiment will be described. 1] The knee operating lever 35 may be linearly formed and the upper end portion of the knee operating lever 35 may be directly welded to the pivot 29. 2] The first bearing boss 25, the operating shaft 26, and the link 31 may be omitted, and the push rod 23 may be directly driven to be lifted by the upper end portion of the knee operating lever 35. 3] Various modifications may be made based on existing technology or technology obvious to those skilled in the art. Further, the present invention can be applied not only to industrial sewing machines but also to various presser foot operating devices provided in household sewing machines.

[0027]

According to the invention of claim 1, a pivot shaft provided under the sewing machine bed portion, a knee operating lever connected to the pivot shaft, and a knee pad fixed to the knee operating lever. Set the mounting position of the pivot shaft on the lower side of the bed so that the axis of the knee pad mounting lever part of the knee operating lever for mounting the knee pad passes through the pivot shaft or its vicinity. Therefore, when the knee pad moves with the pivot shaft as the center of rotation via the knee operation lever in accordance with the lateral movement of the knee of the worker, the knee pad does not greatly descend, and It is possible to stabilize the posture of the knee pad so that the pushing operation surface of the pad faces the knee side, and the operability of the presser foot operation by the operator is improved.

According to the second aspect of the present invention, the knee operating lever has the fixed lever portion on the upper end side, and the fixed lever portion is fixed to the pivot shaft via the holder. The attachment position of the fixed lever portion to the holder can be finely adjusted according to the preference of the operator, and the operability of the knee rest can be further improved. In addition, the same effect as that of the first aspect is obtained.

According to the third aspect of the present invention, the knee pad mounting lever portion and the fixed lever portion of the knee operating lever are substantially U-shaped.
Since it is configured integrally through the character-shaped bending lever part,
By forming the knee support mounting lever part and the fixed lever part integrally by the bending lever part, a knee operating lever in which the axial center of the knee support mounting lever part passes through the pivot shaft or its vicinity can be easily performed. In addition, it can be created as a single unit.
In addition, the same effect as in claim 2 is obtained.

According to the invention of claim 4, since the parallel link for transmitting the operating force from the pivot shaft to the link mechanism is provided, the pivot shaft is moved closer to the worker by the amount of the parallel link. Since it can be arranged, the knee rest comes closer to the right knee of the worker, and the operability of the knee rest can be further improved. In addition, the same effect as that of any one of claims 1 to 3 is achieved.

According to the fifth aspect of the present invention, since the movement locus of the knee of the worker when operating the knee operation lever and the movement locus of the knee pad are substantially similar to each other, these knees The maximum amount of deviation in the height direction due to the movement locus and the movement of the knee rest becomes extremely small, and it is possible to eliminate the discomfort and discomfort felt by the operator and improve the operability of the presser foot operation. In addition, the same effect as that of any one of claims 1 to 4 is achieved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an industrial sewing machine provided with a presser foot operating device according to an embodiment of the present invention.

FIG. 2 is an enlarged partial front view of a presser foot operating device.

FIG. 3 is a longitudinal sectional view of a main part of an industrial sewing machine provided with a presser foot operating device according to a conventional technique.

[Explanation of symbols]

M industrial sewing machine 1 bed section 8 Presser bar 9 Presser foot 16 link mechanism 29 pivot 31 links 32 holder 35 Knee control lever 35a Fixed lever part 35b Bending lever part 35c Knee rest mounting lever 38 Knee rest Movement track of AK knee rest HK Knee movement locus RH right knee

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyasu Iwakoshi             Brother, 15-1, Naeshiro-cho, Mizuho-ku, Nagoya             Industry Co., Ltd. (72) Inventor Tomoharu Mizutani             Brother, 15-1, Naeshiro-cho, Mizuho-ku, Nagoya             Industry Co., Ltd. F term (reference) 3B150 CE04 CE22 CE23 EA12 EA13                       GA16 JA28

Claims (5)

[Claims] 1. A pivot support shaft provided parallel to the cloth feed direction on the lower side of the sewing machine bed portion, a knee operating lever connected to the pivot supporting shaft, and a knee pad fixed to the knee operating lever. Then
In a presser foot operating device of a sewing machine, which raises a presser foot attached to a lower end of a presser bar through a knee operation lever and a link mechanism connected to the knee operation lever by a lateral movement of an operator, A sewing machine is characterized in that a mounting position of the pivot shaft under the bed portion is set so that an axis of a knee pad mounting lever portion for mounting the knee pad passes through a pivot shaft or a portion in the vicinity thereof. Presser foot operating device. 2. The sewing machine according to claim 1, wherein the knee operating lever includes a fixed lever portion on an upper end side, and the fixed lever portion is fixed to a pivot shaft via a holder. Presser foot operating device. 3. The knee pad mounting lever portion and the fixed lever portion of the knee operating lever are integrally configured via a substantially U-shaped bending lever portion. Presser foot operating device of the sewing machine. 4. The presser foot operating device for a sewing machine according to claim 1, further comprising a parallel link for transmitting an operating force from the pivot shaft to the link mechanism. 5. The movement locus of the knee of the worker when operating the knee operation lever and the movement locus of the knee pad are configured to be approximately similar to each other. A presser foot operating device for a sewing machine according to claim 1.