JP2871284B2 - Sewing machine work cloth feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a work cloth feeder in a so-called industrial sewing machine.

[0002]

2. Description of the Related Art Heretofore, as an apparatus for feeding a work cloth of a sewing machine of this kind, the present applicant has previously proposed the invention described in Japanese Patent Application Laid-Open No. Hei 4-24056. That is, the sewing machine includes a guide rail disposed in a direction orthogonal to a direction in which a sewing machine arm extends, holding means slidably supported by the guide rail, and spreading and holding a work cloth on a sewing machine table; Orthogonal moving means for moving the means in the orthogonal direction of the sewing machine arm along the guide rail; and parallel moving means for moving the holding means together with the guide rail in a direction parallel to the extending direction of the sewing machine arm. In the work cloth feeding device for a sewing machine, the guide rail is disposed in a space below the sewing machine arm on the sewing machine table, and the orthogonal moving means extends in a direction parallel to the sewing machine arm, and is rotatable by a support means. And a spline shaft supported slidably in the axial direction, and attached to a tip end of the spline shaft and rotated on a guide rail. A pinion supported on the stationary, and is configured with a rack fixed to the along a longitudinal direction and holding means engaged with said pinion, the drive means for rotationally driving the spline shaft. The rack is fixed to the lower end of the holding means so that the rack meshes with the lower surface of the pinion.

[0003]

The work cloth of the sewing machine is mounted on a frame-like holding means. The work cloth has various shapes in plan view, and is close to the guide rail for convenience of sewing. It may be necessary to arrange the end of the work cloth on the side so as to protrude from the holding means. In this case, when the end of the work cloth protruding from the frame of the holding means protrudes so as to cover the front or upper surface of the guide rail, the guide is moved when the holding means is moved to move the sewing area of the work cloth. There is an inconvenience that the end of the work cloth comes into contact with a part such as a rail and oil or dust adheres.

In the prior art, the lower surface of the pinion mounted on the front surface of the guide rail is designed to mesh with the teeth on the upper surface of the rack. There is also an inconvenience that the rack and / or the pinion are more likely to be damaged because they are easily attached to the teeth and hard to drop. The present invention has been made to solve these problems at once, and an object of the present invention is to provide a work cloth feeding device for a sewing machine that does not stain a work cloth and does not damage a rack or a pinion. Is what you do.

[0005]

In order to achieve the above-mentioned object, the present invention provides a guide rail arranged in a direction perpendicular to a direction in which a sewing machine arm extends, and a work cloth slidably supported by the guide rail. Holding means for spreading and holding the holding means on a sewing machine table, orthogonal moving means for moving the holding means in a direction orthogonal to the sewing machine arm along a guide rail, and a direction in which the holding means together with the guide rail extends the sewing machine arm. And a parallel direction moving means for moving the guide rail in a space below the sewing machine arm on the sewing machine table. A spline shaft extending in a direction parallel to the arm and supported rotatably and slidably in the axial direction by a support means; Attached to the tip, and a pinion rotatably supported on the guide rails, a rack and fixed along a longitudinal direction thereof in the base of the holding means,
The rack is constituted by driving means for rotationally driving the spline shaft, and the rack is arranged so as to mesh with the upper surface of the pinion.

[0006]

According to the structure of the present invention as described above, the orthogonal direction moving means is located on the rear side of the guide rail,
In addition, the guide means and the spline shaft in the orthogonal direction moving means are located below the sewing machine arm and above the sewing machine table, while the driving means and the guide portion of the parallel direction moving means are located below the sewing machine table. Even if the structures of the orthogonal direction moving means and the parallel direction moving means are enlarged in order to increase the moving range in the orthogonal direction and the parallel direction, the distance between the operator and the tip of the sewing machine arm does not become extremely large, and the usability is improved. Improvement can be achieved.

When the end portion of the work cloth mounted on the holding means protrudes toward the guide rail, the protruding portion is located between the base of the holding means and the lower part of the guide rail and the vertical gap between the sewing machine table. As a result, when the protruding portion touches the guide rail or the like and becomes dirty, or when the sewing area of the work cloth is moved so that the sewing needle is located on the side closer to the guide rail in the frame of the holding means, The protruding portion can also be prevented from interfering with sewing.

Further, since the rack in the holding means is located at the upper portion and is arranged so as to mesh with the upper surface of the pinion on the guide rail side, the tooth surface of the rack faces downward, and the tooth surface of the pinion is also raised by the rack. As a result, it is possible to reduce the risk of breakage of pinions or the like due to lint or foreign matter adhering to these tooth surfaces.

[0009]

Next, an embodiment of the present invention will be described. FIG. 1 is a perspective view showing an embodiment of a work cloth feeding device for a sewing machine. The work cloth feeder is arranged on a sewing machine table T mounted on the base 1, and is provided with a guide rail 2 and a work cloth W (see FIG. 6) arranged in front of the guide rail 2. As holding means capable of moving on the sewing machine table T in the X direction (the direction orthogonal to the longitudinal direction of the sewing machine arm M in plan view of the sewing machine table T) and the Y direction (also in the direction parallel to the extending direction of the sewing machine arm M). , And orthogonal moving means and parallel moving means. These are the space between the sewing machine arm M and the sewing machine table T, and the sewing machine table T
And over the bottom.

The upper shaft 6 inside the sewing machine arm M and the lower shaft 7 below the sewing machine table T are connected so as to rotate in the same direction via a timing belt 9 arranged in a base column 8. , Driven by a drive motor 10. The holding mechanism 3 includes upper and lower pressing frames 11a and 11b having a rectangular shape in a plan view for holding the work cloth W, and upper and lower pressing frames 11a and 11b.
A press-up mechanism 12 that presses and raises 11b, an actuator 13 such as an air cylinder, and an ejector device 14 that pushes the lower press frame 11b forward of the sewing machine table T (opposite to the base column 8). It is composed of Further, by operating the lifting / lowering actuator 13, the arm member 15 in the presser lifting mechanism 12 is moved.
Is rotated upward to raise and lower the upper holding frame 11a. Then, the work cloth W is disposed between the upper and lower holding frames 11a and 11b, and is securely held with the work cloth W interposed therebetween.

The holding mechanism 3 is connected to a support member 16 which can move in the X direction along the front surface of the guide rail 2 and moves integrally. The guide rail 2 is located above the sewing machine table T and below the sewing machine arm M as shown in FIGS. 1, 2, 6 and 7, and is orthogonal to the direction in which the sewing machine arm M extends. It is arranged to extend in the direction (X direction in FIG. 1). The lower part of the front surface of the guide rail 2 is provided with a rail portion 17 for a lower cover along the longitudinal direction of the guide rail 2. Guide rail 2
Pair of arms 1 extending rearward (parallel direction) from the rear surface of
8 and 18 are provided with guide portions 19 on their lower surfaces, respectively.
Slidably supported by And the guide rail 20
Is fixed on the base 1 at the rear of the sewing machine table T. With the above configuration, as shown in FIG. 6, the guide rail 2 is floated above the upper surface of the sewing machine table T by an appropriate clearance dimension (H1) in a direction parallel to the direction in which the sewing machine arm M extends (Y direction). It is supported movably.

Next, a parallel moving mechanism 5 as a parallel moving means for moving the guide rail 2 in the parallel direction (Y direction) will be described with reference to FIGS. As shown in FIG. 2, the parallel moving mechanism 5 includes a pair of left and right guide rails 20, a pair of right and left timing belts 21 arranged in parallel with a direction in which the guide rails 20 extend, and a timing belt 21. And an actuator 23 such as an AC servomotor that can rotate forward and backward. Each timing belt 21 is wound around a pair of front and rear pulleys 24a and 24b disposed at an upper portion in the base 1, and each timing belt 21
And the arm 18 fixed to the guide rail 2 are removably connected by a mounting bracket 25. Pulley 2
The driving shaft 22 to which the motors 4b and 24b are attached is driven to rotate by a parallel movement motor 23 provided in the base 1 via a driving timing belt 26 at a middle position of the driving shaft 22. With this configuration, when the parallel movement motor 23 is rotated forward, the guide rail 2 is advanced through the timing belt 21 toward the distal end of the sewing machine arm M. When the parallel movement motor 23 is rotated in the reverse direction, the guide rail 2 It moves backward in the direction approaching 8.

Next, the orthogonal moving mechanism 4 as the orthogonal moving means will be described with reference to FIGS. 2 to 4 and FIGS. The orthogonal direction moving mechanism 4 moves the holding mechanism 3 with respect to the guide rail 2 in the longitudinal direction (X direction) on both left and right sides thereof, and includes a rack 30, a pinion 31, a spline shaft 32, a timing belt 33. Actuator such as an AC servomotor that can rotate forward and backward
And so on.

As shown in FIG. 6, the rack 30 is fixed to the upper back surface of the support member 16 having an inverted L-shaped cross section at the base of the holding mechanism 3 via a set screw 35. The surface is formed downward as shown in FIG. The pinion 31 meshing with the tooth surface of the rack 30 on the upper surface side is a front recess 36 at the left and right center of the guide rail 2.
, The pinion 31 is detachably attached to the tip of a spline shaft 32, and the tip of the spline shaft 32 is rotatably supported by the guide rail 2 via a bearing 37.

As shown in FIG. 7, a left and right guide rail 40 fixed by bolts 39 protrudes rearward at a plurality of places from the back surface of the support member 16 at a mounting portion 38 on the front surface of the guide rail 2. Upper and lower pair of holding rollers 41,
It is pinched at 41. And, this holding roller 41,
Reference numeral 41 is attached with a set screw (not shown). In addition, between the upper part of the support member 16 or the upper part of the rack 30 and the upper part of the guide rail 2, a restraining means such as a pressing member (not shown) is provided so that the support member 16 does not separate from the guide rail 2. I have.

As shown in FIG. 3, a pair of support brackets 42 are provided in the inner space of the base column 8, and between the pair of support brackets 42,
A pulley body 43 is arranged, and the pulley body 43 is rotatably supported by the pair of support brackets 42,42. An intermediate portion of the spline shaft 32 extending in the front-rear direction (Y direction) above the sewing machine table T penetrates the base column 8 and can only slide in the Y direction with respect to the spline hole of the shaft center of the pulley body 43. It is pivoted on.

An actuator 34 such as an AC servomotor is mounted on a mounting base 44 provided in the base 1 so as to be vertically rotatable and vertically adjustable, and is driven from the actuator 34 via a gear train 45. The timing belt 33 is wound around the pulley 46 and the pulley body 43. When the actuator 34 is rotated forward, the pinion 31 is rotated in the forward direction (clockwise as viewed from the front in FIG. 7) via the spline shaft 32, and the support member 16 is moved rightward. When the actuator 34 is rotated in the reverse direction, the pinion 31 is rotated in the opposite direction (counterclockwise as viewed from the front in FIG. 7) via the spline shaft 32, and the support member 16 is moved to the left.

With this configuration, the holding mechanism 3 can be moved in the parallel direction along the longitudinal direction of the guide rail 2 on the sewing machine table T. The operator stands on the front side of the sewing machine table T so as to face the sewing machine arm M, mounts the work cloth W on the holding mechanism 3,
Perform the replacement of the sewing needle, bobbin thread and upper thread. In this case, the orthogonal movement mechanism 4 is located behind the guide rail 2, and the spline shaft 32 of the guide rail 2 and the orthogonal movement mechanism 4 is located below the sewing machine arm M and above the sewing machine table T. On the other hand, since the driving means and the guide portion (guide rail 20) of the parallel direction moving mechanism 5 are located below the sewing machine table T, the orthogonal direction moving mechanism is required to increase the moving range of the holding mechanism 3 in the perpendicular direction and the parallel direction. Even if the structures of the parallel moving mechanism 4 and the parallel direction moving mechanism 5 are enlarged, the distance between the worker and the tip of the sewing machine arm M does not become extremely large, and the usability can be improved.

When the end of the work cloth W mounted on the holding mechanism 3 protrudes toward the guide rail 2, the protruding portion is moved to the supporting member 16 which is the base of the holding mechanism 3.
As a result, the protruding portion of the work cloth W may be contaminated by touching the guide rail 2 or the like, or may be contaminated by the upper and lower holding frames 11a, 11b. When the sewing area of the work cloth W is moved so that the sewing needle is positioned on the side closer to the guide rail in the frame of the frame 11b, the protruding portion can be prevented from obstructing the sewing.

Further, since the rack 30 of the holding mechanism 3 is located above the support member 16 as the base and is arranged so as to mesh with the upper surface of the pinion 31 on the guide rail 2 side, the tooth surface of the rack 30 faces downward. And the tooth surface of the pinion 31 is also covered by the rack 30 from above.
There is also an effect that it is possible to reduce the risk of breakage of pinions or the like due to lint or foreign matter adhering to these tooth surface portions.

[Brief description of the drawings]

FIG. 1 is a perspective view of a work cloth feeding device.

FIG. 2 is a plan view of a main part.

FIG. 3 is a side sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a side view showing a press-up mechanism of the holding frame in the holding mechanism.

FIG. 6 is an enlarged side sectional view of a main part of a guide rail portion, as viewed in the direction of arrows VI-VI in FIG. 7;

FIG. 7 is a front view taken along the line VII-VII in FIG. 6;

FIG. 8 is a partially cutaway side view taken along the line VIII-VIII in FIG. 4;

[Explanation of symbols]

 M Sewing machine arm T Sewing machine table 1 Base 2 Guide rail 3 Holding mechanism 4 Orthogonal moving mechanism 5 Parallel moving mechanism 16 Support member 17 Rail part 18 Arm 20 Guide rail 21, 33 Timing belt 22 Drive shaft 23, 34 Actuator 26 Drive Timing belt 30 Rack 31 Pinion 32 Spline shaft

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Motohiro Komoda 15-1, Naeshiro-cho, Mizuho-ku, Nagoya-shi Inside the Brother Industries, Ltd. Co., Ltd. (72) Inventor Yoichi Kurahashi 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi Brother Industries, Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) D05B 1/00-83/00

Claims (1)

(57) [Claims] 1. A guide rail arranged in a direction perpendicular to a direction in which a sewing machine arm extends, a holding means slidably supported by the guide rail, and holding a work cloth spread on a sewing machine table; and the holding means. And a parallel direction moving means for moving the holding means together with the guide rail in a direction parallel to the extending direction of the sewing machine arm. In the work cloth feeder, the guide rail is arranged in a space below the sewing machine arm on the sewing machine table, while the orthogonal direction moving means is provided.
A spline shaft extending in a direction parallel to the sewing machine arm and supported rotatably and slidably in the axial direction by a supporting means; and a spline shaft attached to a tip end of the spline shaft and rotatably supported by a guide rail. A pinion, a rack fixed to the base of the holding means along the longitudinal direction thereof, and a driving means for rotating and driving the spline shaft;
A work cloth feeding device for a sewing machine, wherein the rack is arranged so as to mesh with an upper surface side of a pinion.