JPH0585372U - Machine feed machine for sewing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] A holding mechanism 3 for spreading and holding a work cloth on a sewing machine table T is supported by a supporting portion midway in the longitudinal direction of a spline shaft 32 for moving in a direction orthogonal to the sewing machine arm M. Prevent the movement allowance range of N is narrowed. [Structure] A guide rail 2 is arranged in a space above a sewing machine table T and below a sewing machine arm M. The orthogonal movement mechanism 4 is attached to the distal end of a spline shaft 32 extending in the direction parallel to the sewing machine arm M, and the pinion 31 is rotatably supported by the guide rail 2 and the base of the holding mechanism 3 in the longitudinal direction thereof. The support bracket 42 and the pulley body 43, which are configured by the rack 30 fixed along the side of the spline shaft 32 and rotatably and slidably support the middle portion of the spline shaft 32, are arranged in the base column 8, and the sewing machine table T The pulley body 43 is rotationally driven from the actuator 34 arranged below via the timing belt 33.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a work cloth feeding device in a so-called industrial sewing machine.

[0002]

[Prior Art]

 Conventionally, the present applicant has proposed the invention as described in Japanese Patent Application Laid-Open No. 4-24056 as a work cloth feeding device for this type of sewing machine. That is, in this sewing machine, a guide rail arranged in a direction orthogonal to the direction in which the sewing machine arm extends, a holding means slidably supported by the guide rail, and a holding means for spreading and holding the work cloth on the sewing machine table, Orthogonal direction moving means for moving the holding means along the guide rail in the direction orthogonal to the sewing machine arm, and parallel movement means for moving the holding means together with the guide rail in the direction parallel to the extending direction of the sewing machine arm. In the machine feed device for sewing machine, the guide rail is arranged in the space below the sewing machine arm on the sewing machine table, while the orthogonal moving means extends in the direction parallel to the sewing machine arm and is rotated by the pulley body. A spline shaft that is freely supported and slidable in the axial direction, and is attached to the tip of the spline shaft, Is configured and rotatably supported pinion, a rack fixed to the along a longitudinally 且 one holding means engaged with said pinion, the driving means for the spline shaft rotation driven.

A pulley body that rotatably and slidably supports the spline shaft is arranged outside the base column of the sewing machine arm and on the side near the guide rail (the leading end side of the sewing machine arm) to drive the spline shaft. The rotational driving force from the means is transmitted to the spline shaft via the timing belt and the pulley body.

[0004]

[Problems to be solved by the device]

 However, in such a structure, the guide rail is retracted toward the base column of the sewing machine arm only before the rear surface of the guide rail collides with the pulley body that is the support means of the spline shaft and its support portion. However, there is a problem in that the allowable movement range of the work cloth holding means becomes narrower by that amount.

Further, the work cloth of the sewing machine is placed on a frame-shaped holding means, but there are various shapes in plan view of the work cloth, and for convenience of sewing, the work cloth of the work cloth is placed on the side close to the guide rail. It may be necessary to position the end so that it extends beyond the retaining means. In that case, with the end of the work cloth protruding from the frame of the holding means extended so as to enter the gap between the guide rail and the sewing machine table, the holding means, and thus the guide rail, may approach the pulley body. When the work cloth is retracted, the end portion of the work cloth winds around the pulley body or the timing belt and there is a risk of damage to the work cloth.

The present invention has been made to solve these problems, and an object of the present invention is to provide a work cloth feed device for a sewing machine that does not narrow the allowable movement range of the holding means. is there.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a guide rail disposed in a direction orthogonal to the extending direction of a sewing machine arm, and a holding member that is slidably supported by the guide rail and spreads and holds a work cloth on a sewing machine table. Means, an orthogonal direction moving means for moving the holding means in a direction orthogonal to the sewing machine arm along a guide rail, and a parallel direction moving means for moving the holding means in a direction parallel to the extending direction of the sewing machine arm. In the machine feed device for a sewing machine provided, the guide rail is arranged in a space above the sewing machine table and below the sewing machine arm, while the orthogonal moving means extends in a direction parallel to the sewing machine arm and is supported by the supporting means. A spline shaft supported rotatably and slidably in the axial direction, attached to the tip of the spline shaft, and rotatable on a guide rail A rotating member that is constituted by a supported pinion and a rack that meshes with the pinion and is fixed to the base portion of the holding means along the longitudinal direction thereof, and is provided in the supporting means provided in the hollow base column of the sewing machine arm. Drive means for rotatably and slidably supporting the spline shaft via the shaft and for rotationally driving the rotating member are arranged in the base column or below the sewing machine table.

[0008]

[Operation and effect of the device]

 According to the configuration of the present invention as described above, the orthogonal moving means is located on the rear side of the guide rail, and the spline shaft of the guide rail and the orthogonal moving means is below the sewing machine arm and above the sewing machine table. On the other hand, since the driving means of the parallel moving means is located below the sewing machine table, the structure of the orthogonal moving means and the parallel moving means should be changed in order to increase the moving range of the holding means in the orthogonal direction and the parallel direction. Even if the size is increased, the distance between the operator and the tip of the sewing machine arm does not become extremely large, and the usability can be improved.

When the end portion of the work cloth attached to the holding means protrudes toward the guide rail side, the protruding portion is exposed between the base portion of the holding means and the vertical gap between the guide rail and the sewing machine table. As a result of being able to move, when this protruding part touches the guide rail etc. and becomes dirty, or when the sewing area of the work cloth is moved so that the sewing needle is located on the side of the frame of the holding means close to the guide rail, It is also possible to prevent the protruding portion from interfering with sewing.

Since the rotating member for rotatably and slidably supporting the middle portion of the spline shaft and its supporting means are provided in the hollow base column of the sewing machine arm, the guide rail is The front side of the base column can be approached, and the movement allowable range of the holding means can be increased correspondingly. Moreover, since the rotating member is located in the base column and the driving means is also arranged in the base column or below the sewing machine table, even when the guide rail is approached in the direction of the base column, it protrudes from the position of the guide rail. It is possible to prevent the end portion of the work cloth from directly contacting the rotating member and the driving means.

Therefore, according to the present invention, it is possible to prevent the work cloth from being damaged under the condition that the movement allowance range of the holding means can be increased.

[0012]

【Example】

 Next, an embodiment embodying the present invention will be described. FIG. 1 is a perspective view showing an embodiment of a work cloth feeding device of a sewing machine. The work cloth feeding device is arranged on the sewing machine table T mounted on the base 1. The work cloth feeding device is arranged in front of the guide rail 2 and the work cloth W (see FIG. 6). Holding by sandwiching the sewing machine table T in the X direction (direction orthogonal to the longitudinal direction of the sewing machine arm M in the plan view of the sewing machine table T) and the Y direction (also parallel to the extending direction of the sewing machine arm M). It comprises a holding mechanism 3 as means, a direct movement means and a parallel movement means. These are arranged over the space between the sewing machine arm M and the sewing machine table T and the lower portion of the sewing machine table T.

An upper shaft 6 inside the sewing machine arm M and a lower shaft 7 below the sewing machine table T are connected via a timing belt 9 arranged in a base column 8 so as to rotate in the same direction. And is driven by the drive motor 10. The holding mechanism 3 includes upper and lower presser frame bodies 11a and 11b having a rectangular shape in plan view for sandwiching the work cloth W, a presser foot lifting mechanism 12 that presses the upper and lower presser frame bodies 11a and 11b and raises them upward, and an air cylinder. And the like, and an ejector device 14 for pushing the lower presser frame 11b forward of the sewing table T (opposite to the base column 8). Further, by operating the elevating actuator 13, the arm member 15 of the presser lifting mechanism 12 is pivoted upward to elevate the upper presser frame body 11a. Then, the work cloth W is disposed between the upper and lower presser frame bodies 11a and 11b, and the work cloth W is sandwiched and securely held.

The holding mechanism 3 is connected to a supporting member 16 that is movable left and right in the X direction along the front surface of the guide rail 2 and moves integrally. As shown in FIGS. 1, 2, 6 and 7, the guide rail 2 is located in a space above the sewing machine table T and below the sewing machine arm M, and with respect to the extending direction of the sewing machine arm M. It is arranged so as to extend in the orthogonal 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. The pair of arms 18, 18 extending rearward (parallel direction) from the rear surface of the guide rail 2 are provided with guide portions 19 on their lower surfaces, and each guide portion 19 is slidable on a guide rail 20 extending in an orthogonal direction. It is supported. The guide rail 20 is fixed on the base 1 at the rear of the sewing table T. With the above structure, the guide rail 2 is, as shown in FIG. 6, in a direction parallel to the extending direction of the sewing machine arm M (Y direction) while being floated above the upper surface of the sewing machine table T 1 by a clearance dimension (H1) as appropriate. ) Is supported movably.

Next, a parallel direction moving mechanism 5 as a parallel direction moving means for moving the guide rail 2 in the parallel direction (Y direction) will be described with reference to FIGS. 1 and 2. As shown in FIG. 2, the parallel movement mechanism 5 includes a pair of left and right guide rails 20, a pair of left and right timing belts 21 arranged in parallel with the extending direction of the guide rails 20, and a timing belt 21 thereof. The main elements are a drive shaft 22 for driving the motor and an actuator 23 such as an AC servomotor capable of rotating in the forward and reverse directions. Each timing belt 21 is wound around a pair of front and rear pulleys 24a and 24b arranged in the upper portion of the base 1, and each timing belt 21 and the arm 18 fixed to the guide rail 2 are detachable by a mounting bracket 25. Link. It is rotationally driven by a parallel movement motor 23 provided in the base 1 via a drive timing belt 26 in the middle of the drive shaft 22 to which the pulleys 24b, 24b are attached. With this configuration, when the horizontal movement motor 23 is normally rotated, the guide rail 2 is moved forward through the timing belt 21 toward the tip of the sewing machine arm M, and when the parallel movement motor 23 is reversely rotated, the guide rail 2 is rotated. Moves backward in the direction of approaching the base column 8.

Next, the orthogonal movement mechanism 4 as the orthogonal movement means will be described with reference to FIGS. 2 to 4 and 6 to 8. 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. The rack 30, the pinion 31, the spline shaft 32, and the timing belt 33. And an actuator 34 such as an AC servo motor capable of rotating in forward and reverse directions.

As shown in FIG. 6, the rack 30 is fixed to the back surface of the upper side 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, and the teeth of the rack 30 are fixed. The surface is formed downward, as shown in FIG. The pinion 31 that meshes with the tooth surface of the rack 30 on the upper surface side is located in the front recess 36 at the left and right center of the guide rail 2, and the pinion 31 is detachably attached to the tip of the spline shaft 32. 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 guide rail 40 having left and right lengths fixed by bolts 39 is attached to the mounting portion 38 on the front surface of the guide rail 2 so as to face rearward from the back surface of the support member 16 at a plurality of locations. It is sandwiched by a pair of projecting upper and lower clamping rollers 41, 41. Then, the nipping rollers 41, 41 are attached by a set screw (not shown). In order to prevent the support member 16 from being separated from the guide rail 2, a restraint means such as a pressing member (not shown) is provided between the upper portion of the support member 16 or the rack 30 and the upper portion of the guide rail 2. ing.

As shown in FIG. 8, a pair of support brackets 42 and 42 are provided in the internal space of the base column 8, and a pair of support brackets 42 and 42 serve as a rotating member. A pulley body 43 is arranged. The pulley body 43 is fitted onto a boss shaft 47 via a key or the like so as to rotate integrally, and the boss shaft 47 is rotated via bearings 48, 48 on support brackets 42, 42 as a pair of supporting means. It is supported freely. The middle part of the front and rear 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 is located in the Y direction with respect to the spline hole of the boss shaft 47 which is the shaft center of the pulley body 43. It is rotatably supported only by sliding. As another example, the pulley body 43 and the boss shaft 47 may be integrally formed.

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 adjustable in vertical position, 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 in the forward direction, the pinion 31 is rotated in the forward direction (clockwise as viewed from the front in FIG. 7) via the spline shaft 32 to move the support member 16 to the right. When the actuator 34 is rotated in the reverse direction, the pinion 31 is rotated in the reverse direction (counterclockwise as viewed from the front in FIG. 7) via the spline shaft 32, and the support member 16 is moved leftward.

With this configuration, the holding mechanism 3 can be moved on the sewing machine table T in the parallel direction along the longitudinal direction of the guide rail 2. The worker stands on the front side of the sewing machine table T so as to face the sewing machine arm M, puts the work cloth W on the holding mechanism 3, and carries out the work of exchanging the sewing needle, the bobbin thread and the upper thread. . In this case, the orthogonal movement mechanism 4 is located on the rear side of 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 drive means and the guide portion (guide rail 20) of the parallel movement mechanism 5 are located below the sewing machine table T, the movement range of the holding mechanism 3 in the orthogonal direction and the parallel direction should be wide, and the movement in the orthogonal direction should be large. Even if the structures of the mechanism 4 and the parallel movement mechanism 5 are made large, the distance between the operator and the tip of the sewing machine arm M does not become extremely large, and the usability can be improved.

When the end portion of the work cloth W mounted on the holding mechanism 3 protrudes toward the guide rail 2 side, the protruding portion is the support member 16 which is the base portion of the holding mechanism 3 and the guide rail 2. As a result, the work cloth W can be exposed in the vertical gap (H1) between the sewing machine table T and the sewing machine table T. As a result, the protruding portion of the work cloth W touches the guide rail 2 or the like, and the frame of the vertical presser frame bodies 11a and 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, it is possible to prevent the protruding portion from interfering with the sewing.

Further, since the rack 30 of the holding mechanism 3 is positioned above the support member 16 which is the base, and is arranged so as to mesh with the upper surface side of the pinion 31 on the guide rail 2 side, the tooth surface of the rack 30 is As a result of facing downward and the tooth surface of the pinion 31 being covered from above by the rack 30, the risk of damage to the pinion or the like due to thread dust or foreign matter adhering to these tooth surface portions can be reduced.

A sewing machine arm M is provided with a pulley body 43, which is a rotating member for rotatably and slidably supporting the middle portion of the spline shaft 32, and support brackets 42, 42 as a supporting means thereof. The guide rail 2 can be brought close to the front surface of the base column 8 and the allowable movement range of the holding mechanism 3 can be correspondingly increased because the guide rail 2 is brought close to the front surface of the base column 8.

Moreover, since the rotating member such as the pulley body 43 is located in the base column 8, and the actuator 34 for driving the pulley member 43 is also arranged in the base column 8 or below the sewing machine table T, the guide rail 2 is fixed to the base column 8. Even when they are brought close to each other in the eight directions, it is possible to prevent the end of the work cloth protruding from the location of the guide rail 2 from directly contacting the rotating member or the driving means.

Therefore, according to the present invention, it is possible to prevent the work cloth from being damaged under the condition that the movement allowance range of the holding mechanism 3 can be increased.

[Brief description of drawings]

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

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

3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a view taken along the line IV-IV in FIG.

FIG. 5 is a side view showing a press-up mechanism for a presser frame body in a holding mechanism.

6 is an enlarged side cross-sectional view of a main part of a guide rail portion taken along the line VI-VI in FIG.

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

8 is a partially cutaway side view taken along the line VIII-VIII of FIG.

[Explanation of symbols]

 M sewing machine arm T sewing machine table 1 base 2 guide rail 3 holding mechanism 4 orthogonal movement mechanism 5 parallel movement mechanism 8 base column 21, 33 timing belt 22 drive shaft 23, 34 actuator 26 drive timing belt 30 rack 31 pinion 32 spline Shaft 42 Support bracket 43 Pulley body 47 Boss shaft 48 Bearing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Motohiro Komoda, 15-1, Naeshiro-cho, Mizuho-ku, Nagoya, Brother Industry Co., Ltd. (72) Inventor Yoichi Kurahashi, 15-1 Naeshiro-cho, Mizuho-ku, Nagoya City Brother Industries, Ltd.

Claims (1)

[Scope of utility model registration request] 1. A guide rail arranged in a direction orthogonal to a direction in which a sewing machine arm extends, holding means slidably supported by the guide rail, and a holding means for spreading and holding a work cloth on a sewing machine table, and the holding means. A work cloth feed device for a sewing machine including an orthogonal movement means for moving the sewing machine along a guide rail in the orthogonal direction of the sewing machine arm, and a parallel direction movement means for moving the holding means in a direction parallel to the extending direction of the sewing machine arm. , The guide rail is arranged in the space below the sewing machine arm on the sewing machine table, while the orthogonal movement means extends in the direction parallel to the sewing machine arm and is rotatable and axially slid by the support means. A spline shaft that is movably supported, a pinion that is attached to the tip of the spline shaft, and is rotatably supported by a guide rail, and the pinion. A rack that meshes with the union and is fixed to the base of the holding means along the longitudinal direction thereof, and the spline shaft is attached to the supporting means provided in the hollow base column of the sewing machine arm via the rotating member. A work cloth feed device for a sewing machine, characterized in that drive means that is rotatably and slidably supported and that rotationally drives a rotating member is arranged in the base column or below the sewing machine table.