JP4763931B2 - sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine that drives a sewing frame on a sewing machine table. In the sewing machine, the left-right direction is conventionally referred to as the X direction (or V direction), and the front-rear direction is referred to as the Y direction (or H direction).
[0002]
[Prior art]
An example of a conventional sewing machine is disclosed in Japanese Patent Publication No. 6-93946. As shown in FIG. 5, the sewing machine 51 includes an XY table device 53 as a driving mechanism that drives the sewing frame 52 in the X direction and the Y direction. The Y-direction drive mechanism 54 of the XY table device 53 is wound around a pair of pulleys 55 and 56 that are disposed behind the sewing frame 52 in the Y direction with a space in the front-rear direction. The sewing frame 52 is driven in the Y direction by a timing belt 58 that is hooked and connected to the sewing frame 52 via a connecting member 57 or the like.
[0003]
[Problems to be solved by the invention]
However, since the Y-direction drive mechanism 54 is provided behind the sewing frame 52, there is a problem that the size of the sewing machine 51 in the Y direction is increased by the size of the Y-direction drive mechanism 54 in plan view.
[0004]
An object of the present invention is to solve the above-described problems and provide a sewing machine configured in a compact manner.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the sewing machine according to the present invention includes a sewing machine arm that supports a sewing machine head above the bed, and the sewing machine arm includes a horizontal arm portion extending substantially horizontally in the Y direction above the bed. The lateral arm portion incorporates a Y-direction drive mechanism for driving the sewing frame in the Y direction, and the Y-direction drive mechanism has an X direction for driving the sewing frame in the X direction below the Y-direction drive mechanism. The drive mechanism is supported to be drivable in the Y direction, and the sewing machine arm includes a vertical arm portion that supports the rear side of the horizontal arm portion, and the vertical arm portion is inserted into the rear portion of the X direction drive mechanism. It is characterized by having a concave portion on the front side .
[0007]
Although it does not specifically limit as said X direction drive mechanism and said Y direction drive mechanism, The following aspect is illustrated.
(1) A mode including a pair of pulleys rotatably supported at an interval in the driving direction and a timing belt wound around the pulleys, and driving the sewing frame via the timing belt.
(2) A mode of including a feed screw extending in the driving direction and a moving body having a female screw hole screwed into the feed screw, and driving the sewing frame through the moving body. Although it does not specifically limit as said feed screw, A ball screw, a trapezoid screw, a static pressure screw, a magnetic screw etc. are illustrated.
(3) A mode including a rack extending in the driving direction and a pinion meshing with the rack, and driving the sewing frame via the rack.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show a sewing machine 1 according to an embodiment of the present invention. The sewing machine 1 includes a bed 2, a sewing machine arm 3 attached to the rear part of the bed 2, a sewing machine head 4 attached to the tip of the sewing machine arm 3 and supported above the bed 2, and a sewing machine arm 3. A built-in Y direction drive mechanism 5, an X direction drive mechanism 6 supported below the Y direction drive mechanism 5, and a sewing frame 7 detachably attached to the X direction drive mechanism 6 are provided. Yes. As is well known, a work cloth (not shown) stretched and held on the sewing frame 7 by the cooperation of a needle 8 that is driven up and down by the sewing head 4 and a shuttle (not shown) that is driven to rotate in the bed 2. Sewing is performed.
[0009]
The sewing machine arm 3 includes a horizontal arm portion 11 that extends substantially horizontally in the Y direction above the bed 2 and a vertical arm portion 12 that supports the rear side of the horizontal arm portion 11. As shown in FIG. 2, the sewing machine arm 3 is formed in a hollow shape, and is formed in a state where the lower side of the horizontal arm portion 11 and the front side of the vertical arm portion 12 are opened. In this way, recesses 11a and 12a are formed on the lower side of the horizontal arm portion 11 and on the front side of the vertical arm portion 12, respectively.
[0010]
The Y-direction drive mechanism 5 is built in the recess 11 a of the lateral arm portion 11 of the sewing machine arm 3, and is supported in a Y-direction movable portion 15 that is slidably supported in the Y-direction, and before and after the Y-direction movable portion 15. A driving pulley 16 and a driven pulley 17 that are rotatably supported by horizontal axes extending in the X direction at intervals, and a timing belt that is wound around the pulleys 16 and 17 and connected to the Y-direction movable portion 15. 18. The drive pulley 16 is rotationally driven by a Y-direction drive motor 19 attached to the horizontal arm portion 11. A motor frame 21 having an inverted U-shape when viewed from the front is connected to the lower side of the Y-direction movable portion 15 via a connecting member 20, and an X-direction driving mechanism 6 is driven in the motor frame 21. A direction drive motor 22 is attached.
[0011]
The X-direction drive mechanism 6 is built in a housing 25 that extends in the X direction and has a convex portion 25a formed in a plan view at the rear center. The convex portion 25 a is formed so as to be fitted between both side walls of the motor frame 21, and is fixed to the lower end side of the motor frame 21 with a bolt 26 in the fitted state. The X-direction drive mechanism 6 includes an X-direction movable unit 27 supported so as to be slidable in the X-direction, and a pair of driven units that are rotatably supported by vertical axes at intervals on the left and right sides of the X-direction movable unit 27. A pulley 28, a drive pulley 29 supported by a vertical shaft at an intermediate position and rearward of both the driven pulleys 28, and a timing at which the pulleys 28 and 28 are wound around the pulleys 28 and coupled to the X-direction movable unit 27 A belt 30 and a pair of guide wheels 32 that are rotatably supported by a vertical shaft at a front side of the drive pulley 29 and that are rotatably supported by a vertical shaft are provided. The drive pulley 29 is rotationally driven by the X direction drive motor 22. A drive pulley 29 and a guide wheel 32 are attached to the convex portion 25a of the housing 25 as shown in FIG. As shown by a two-dot chain line in FIG. 4, in a state where the Y-direction movable portion 15 is moved to the rearmost position, the convex portion 25 a together with the motor frame 21 and the X-direction drive motor 22 is a concave portion of the vertical arm portion 12. It is formed so as to enter into 12a. The sewing frame 7 is detachably attached to the X direction movable portion 27 via an attachment member 34.
[0012]
Next, the frame driving operation of the sewing machine 1 will be described. When the drive pulley 16 of the Y-direction drive mechanism 5 is rotationally driven by the Y-direction drive motor 19, the Y-direction movable portion 15 is moved in the Y direction via the timing belt 18 in accordance with the rotational direction. The sewing frame 7 is moved in the Y direction via the X direction driving mechanism 6 connected to the Y direction movable portion 15. When the drive pulley 29 of the X-direction drive mechanism 6 is rotationally driven by the X-direction drive motor 22, the X-direction movable portion 27 is moved in the X direction via the timing belt 30 according to the rotational direction. And the sewing frame 7 connected with the X direction movable part 27 is sent to a X direction.
[0013]
According to the sewing machine 1 of the present invention configured as described above, since the Y-direction drive mechanism 5 is built in the horizontal arm portion 11 of the sewing machine arm 3, a conventional Y-direction drive mechanism is provided behind the sewing frame. The size in the Y direction can be made more compact than the sewing machine. Therefore, for example, the carrying of the sewing machine 1 can be facilitated.
[0014]
In addition to this, a concave portion 12a is formed in front of the vertical arm portion 12 of the sewing machine arm 3, and a convex portion 25a on the rear side of the housing 25 of the X-direction drive mechanism 6 is configured to enter the concave portion 12a. Therefore, the size in the Y direction can be made more compact accordingly.
[0015]
In addition, this invention is not limited to the said embodiment, For example, it can also be suitably changed and embodied as follows, for example in the range which does not deviate from the meaning of invention.
(1) The Y-direction drive mechanism 5 and / or the X-direction drive mechanism 6 should have a different structure. For example, instead of a pair of pulleys and a timing belt, the Y direction movable portion 15 and the X direction movable portion 27 are configured to be fed by a feed screw and a female screw member, a rack and a pinion, or the like.
(2) The shape of each part of the sewing machine 1 is appropriately changed. For example, in order to improve the stability of the sewing machine 1, there may be mentioned an aspect in which legs extending in the Y direction are provided on both sides of the bed 2.
[0016]
【The invention's effect】
As described above in detail, according to the sewing machine according to the first aspect of the invention, there is an excellent effect that it can be configured in a compact manner.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sewing machine according to an embodiment of the present invention.
FIG. 2 is a view showing a sewing machine arm of the sewing machine.
FIG. 3 is a side view showing a frame driving mechanism of the sewing machine.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
FIG. 5 is a plan view showing a conventional sewing machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Bed 3 Sewing machine arm 4 Sewing head 5 Y direction drive mechanism 6 X direction drive mechanism 7 Sewing frame 11 Horizontal arm part 11a Concave part 12 Vertical arm part 12a Concave part 25 Case 25a Convex part

Claims (1)

In a sewing machine having a sewing arm that supports the sewing head above the bed,
The sewing machine arm includes a lateral arm portion extending substantially horizontally in the Y direction above the bed,
The lateral arm portion incorporates a Y-direction drive mechanism for driving the sewing frame in the Y direction .
The Y-direction drive mechanism supports an X-direction drive mechanism that drives the sewing frame in the X direction on the lower side thereof so that the sewing frame can be driven in the Y-direction.
The sewing machine arm includes a vertical arm portion that supports a rear side of the horizontal arm portion,
The vertical arm portion has a recess on the front side into which a rear portion of the X-direction drive mechanism can enter .

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