JP4629844B2 - Sewing frame drive device for sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing frame driving device that drives a sewing frame of a sewing machine.
[0002]
[Prior art]
In order to sew a work cloth that is longer than the longitudinal width of the sewing machine, the cloth length direction of the work cloth is stretched between a pair of rollers extending in the cloth length direction, and the work cloth is driven in the cloth length direction by rotating the rollers. A drive device designed to do this is considered.
[0003]
As an example of such a device, a sewing frame driving device disclosed in Japanese Patent Application Laid-Open No. 58-197364 is provided with a sewing frame that is slidable in the X direction (cloth width direction) by a sliding mechanism on a machine frame. A pair of rollers extending in the X direction are rotatably supported on pillars erected at four corners on the sewing frame. With this configuration, if a work cloth that includes several sewing areas in the cloth length direction is stretched between the rollers, it can be sewn continuously without the need to replace it with the next work cloth. Increases efficiency. However, the mechanism for rotating the roller and the mechanism for feeding the work cloth to the roller must be provided so as to be movable together with the sewing frame. This increases the size and complexity of the entire frame drive mechanism, and increases the work efficiency. Also decreases. In addition, when the work cloth is driven in the Y direction, the stretched state of the work cloth gradually changes, and sewing may not be performed well.
[0004]
As another example, a sewing frame driving device disclosed in Japanese Examined Patent Publication No. 1-229903 is provided with a sewing machine head and a bed that can be integrally driven in the X direction with respect to the machine frame, and a pair extending in the X direction. This roller is fixed to the machine frame. Then, the work cloth wound between the rollers is driven in the Y direction by the rotation of the roller, and the sewing head is driven in the X direction with respect to the work cloth driven in the Y direction. By configuring in this way, driving in the X direction and the Y direction is performed on different members, respectively, so that the drive mechanism can be simplified, and the work cloth is not driven in the Y-axis direction. Sewing can be performed accurately without fluctuation. However, since the sewing head and the table are heavy, a motor having a large torque and a strengthened slide portion are required rather than driving the sewing frame, which is not suitable for high-speed driving for increasing sewing efficiency. In particular, as the sewing machine having a large number of sewing heads, high-speed driving is difficult.
[0005]
[Problems to be solved by the invention]
The object of the present invention is to sew a sewing machine that solves the above-mentioned problems, makes the drive part compact, improves the workability, and enables high-speed driving by reducing the weight associated with the compactness and increasing the sewing efficiency. The object is to provide a frame driving device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a sewing frame drive device for a sewing machine according to the present invention comprises a pair of left and right supports, a front roller and a rear roller extending in the left-right direction immediately before and behind the bed, and a lower portion of the bed. A sewing frame in which at least one lower roller extending in the left-right direction is rotatably mounted, and work cloths are applied to the front roller, the rear roller, and the lower roller, and the cloth width direction is along the length direction of each roller. A cloth holding mechanism for spreading the cloth so that the cloth length direction surrounds each roller to form a loop, and an X-direction drive mechanism for driving the work cloth in the cloth width direction by moving the sewing frame in the left-right direction. When the front rollers, the work cloth by rotating the at least one rear roller and a lower roller and a Y-direction drive mechanism for driving the fabric length direction, the Y direction drive The structure includes an interlocking belt that is wound around the front roller, the rear roller, and the lower roller to interlock each roller, and the cloth fastening mechanism is fitted to the mounting member and the mounting member provided on the interlocking belt And a covering member that sandwiches the work cloth between the mounting member and the mounting member .
[0007]
Here, the cloth fixing mechanism is configured to expand the work cloth so that one end edge and the other end edge in the cloth length direction are separated by at least a hand so as to form a substantially C-shaped loop shape. Are preferred.
[0008]
The X-direction drive mechanism is not limited to a specific structure, but a guide rail that extends in the left-right direction provided on the machine frame of the sewing machine, and a slide portion that is provided on the support body and engages with the rail so as to be movable in the left-right direction. Examples of the support member include an X drive motor that drives the support body in the left-right direction via a transmission member such as a belt, a chain, and a ball screw.
[0009]
Y-direction drive mechanism, the rotation is not limited to a specific structure, and a ball spline extending splined been in inserted through left and right direction to at least one of the previous SL front roller and the rear roller or the lower roller, the ball spline Examples include a Y drive motor that drives the motor.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a sewing frame driving device for a sewing machine embodying the present invention will be described below with reference to FIGS. The sewing machine 1 includes a plurality of sewing heads 7 that drive the needle 8 up and down, a bed 3 that is laid on the machine frame 2 placed on the floor below the sewing machine head 7 in a substantially horizontal and left-right direction, and a sewing head 7. , A hook 4 provided on the front surface of the bed 3, a sewing frame 5 provided so as to straddle the front and rear of the bed 3, an X-direction drive mechanism 31 for driving the work cloth in the cloth width direction, A Y-direction drive mechanism 41 that drives the work cloth 50 in the cloth length direction is provided.
[0013]
In this specification, the left-right direction of the sewing machine corresponds to the cloth width direction of the work cloth, which is conventionally referred to as the same direction as the X direction, and the front-rear direction of the sewing machine corresponds to the cloth length direction of the work cloth. This is called the same direction as the Y direction.
[0014]
The sewing frame 5 includes a front roller 9 and a rear roller 10 extending in the left-right direction at the front and rear of the bed 3 and the bed 3, respectively, a lower roller 11 extending in the left-right direction below the bed 3, and the rollers 9, 10, 11 and a pair of left and right support bodies 12 that are rotatably mounted on the shaft 11.
[0015]
The support 12 is a center of the support 12, and includes a rectangular frame 13 that can pass through a rail base 6 and a slide drive mechanism 34 described later, and three arms 14 that extend outward from the outer periphery of the rectangular frame 13. Become. The tip of each arm 14 is cut back and forth, and pulleys 15 are rotatably attached along the cut portions. The front roller 9, the rear roller 10, and the lower roller 11 are rotatably attached together with the pulley 15 so as to be coaxially sandwiched between a pair of left and right pulleys 15. An interlock belt 17 is wound between the pulleys 15 to enable the rollers 9, 10, and 11 to be interlocked. Here, the diameter when the interlock belt 17 is wound around the pulley 15 is equal to the diameter of the rollers 9, 10, and 11.
[0016]
The interlocking belt 17 includes the front roller 9, the rear roller 10, and the lower roller 11, and the work cloth 50 has a cloth width direction along the length direction of each of the rollers 9, 10, 11, and the cloth length direction of each roller 9. , 10 and 11 is provided with a cloth fastening mechanism 20 for spreading the loop shape.
[0017]
The cloth fastening mechanism 20 of the present embodiment includes attachment members 21a and 21b provided on the interlock belt 17 and a covering member 22 fitted to each attachment member 21a and 21b, and the work cloth 50 is attached between the two. The work cloth 50 is sandwiched. By the attachment members 21 a and 21 b and the covering member 22, the cloth length direction of the work cloth 50 is stretched so as to surround each of the rollers 9, 10, and 11 into a substantially C-shaped loop shape. The attachment members 21a and 21b are rubber protrusions formed in a bulging shape from the interlocking belt 17, and streak grooves 23 for preventing the work cloth 50 from slipping are formed on the outer peripheral surface in parallel with the cloth width direction. ing. And the attachment members 21a and 21b corresponding to the one end edge and the other end edge in the cloth length direction of the work cloth 50 are constructed in the cloth width direction so as to straddle the pair of interlocking belts 17 respectively.
[0018]
The covering member 22 is a thin stainless steel plate having the same length as that of the mounting member 21 and having a substantially Ω-shaped cross section. Yes. Further, a handle 24 extending outward is provided at a position slightly displaced from the vicinity of the apex of the Ω-shaped surface of the covering member 22.
[0019]
Here, the substantially C-shaped loop shape means that when the work cloth 50 is looped around each of the rollers 9, 10, and 11, at least one hand can be put into one end edge and the other end edge in the cloth length direction. It means a state of being separated.
[0020]
The X-direction drive mechanism 31 has a hollow square columnar rail base 6 installed in the left-right direction on the machine frame 2 below the bed 3 and one rail that is disposed on the top surface of the rail base 6 and extends in the X direction. 32, a slide portion 33 that is slidable along the rail 32 and provided on the support 12, and a slide drive mechanism 34 that slides the slide portion 33 in the left-right direction. The sewing frame 5 is driven in the left-right direction with respect to the bed 3 via the slide portion 33. Here, the height level of the upper surface of the bed 3 and the height level of the uppermost point of the front roller 9 and the rear roller 10 of the sewing frame 5 are substantially the same.
[0021]
The slide part 33 includes a slider 35 provided so as to be slidable along the rail 32 and a base part 36 provided on the upper side of the slider 35 and having both ends fixed to the support bodies 12.
[0022]
The slide drive mechanism 34 is wound around the pulleys 37 and 38 via a pair of pulleys 37 and 38 that are rotatably provided at a substantially middle portion and a right end portion of the rail base 6 and a hollow portion of the rail base 6. Both ends are connected to a drive belt 39 that is a loop-shaped transmission member by connecting both ends to the front and rear sides of the slide portion 33 on the upper side of the rail base 6, and a pulley 38 on the end side of the rail base 6. The X drive motor 40 is provided.
[0023]
Each pulley 15 is attached such that a ball spline shaft 16 extends outward from each pulley 15, and ends of each ball spline shaft 16 are rotatably attached to the left and right walls of the machine frame 2. . However, the end portion of the ball spline shaft 16 attached to one pulley 15 interlocked with the lower roller 11 is attached to a Y-direction drive mechanism described later. Here, the pulley 15 is spline-engaged with the ball spline shaft 16, that is, a key groove 16 a provided in a part of the ball spline shaft 16 and parallel to the ball spline shaft 16 is provided in the pulley 15. The pulley 15 is moved in the axial direction with respect to the ball spline shaft 16 by the spline engagement and interlocked with the rotation of the ball spline shaft 16. Like to do. In other words, the ball spline shaft 16 can allow movement in the left-right direction while allowing rotation of the rollers 9, 10, 11.
[0024]
The Y-direction drive mechanism 41 is attached to one end of the ball spline shaft 16 that extends in the left-right direction by being spline-engaged and inserted into one pulley 15 that rotates with the lower roller 11, and is attached to one end of the ball spline shaft 16. And a Y drive motor 42 for rotationally driving the motor. Then, the work cloth 50 stretched on the sewing frame 5 via the interlock belt 17 is driven in the cloth width direction with respect to the bed 3.
The work cloth 50 is attached to the sewing frame 5 configured as described above as shown below. One end edge of the work cloth 50 is placed so as to cover the entire surface of the attachment member 21a, and the upper line of the opening portion of the covering member 22 is applied to the base portion of the corresponding attachment member 21a. And the lower line of the opening part of the covering member 22 is dropped to the attachment member 21a as it is, and the attachment member 21a and the covering member 22 are fitted with the work cloth 50 sandwiched therebetween. Next, the work cloth 50 is wrapped around the front roller 9, the rear roller 10, and the lower roller 11, and the entire surface of the attachment member 21 b is covered with the other end edge of the work cloth 50, and the attachment member 21 b is covered in the same manner as described above. The member 22 is fitted and the work cloth 50 is expanded in a substantially C-shaped loop shape.
[0026]
Here, the work cloth 50 is stretched in a substantially C-shaped loop when the work cloth 50 is looped between the rollers 9, 10, and 11, the hook 4 provided in the bed 3 is moved by the work cloth 50. It is because it is very difficult to replace the hook while the work cloth 50 is stretched because the periphery is wrapped. The hook can be replaced by rotating the interlocking belt 17 and moving the separated portion to the front surface of the hook 4 when the sewing machine is stopped, and then inserting the hand from there.
[0027]
The work cloth 50 is driven in the cloth width direction by moving the slide portion 33 in the left-right direction according to the rotation direction of the X drive motor 40 and driving the sewing frame 5 in the left-right direction. Furthermore, if the sewing frame 5 is driven in the left-right direction only by the X-direction drive mechanism 31, the entire sewing frame 5 is shaken and lacks stability, so that the sewing frame 5 is driven in the left-right direction by the ball spline shaft 16. I support it. The ball spline shaft 16 attached to the Y drive motor 42 not only supports the driving of the sewing frame 5 in the left-right direction, but also serves to transmit the rotation of the Y drive motor 42 to the lower roller 11 as will be described later. ing.
[0028]
For driving the work cloth 50 in the cloth length direction, the rotation of the Y drive motor 42 is transmitted to the lower roller 11 via the ball spline shaft 16, and the rotation of the lower roller 11 is transmitted to each of the rollers 9, 10, 11 by the interlock belt 17. By transmitting, the work cloth 50 stretched in a loop shape between the rollers 9, 10 and 11 is driven in the cloth length direction. Here, the interlock belt 17 is a toothed belt in which grooves in the cloth width direction are formed on the inner peripheral surface thereof, and no slip occurs between the pulley 15 during driving. Can be accurately transmitted to the rollers 9, 10, and 11.
[0029]
According to the sewing frame driving device of the sewing machine configured as described above, the work cloth 50 is supported on the sewing frame 5 in a loop shape, so that the sewing machine 1 as a whole can be made compact. For example, since the width of the sewing machine can be reduced, space saving is achieved and workability is improved.
[0030]
Further, since the sewing frame 5 is made compact and lightweight and can be driven at high speed, the sewing efficiency can be increased.
[0031]
Furthermore, the work cloth having a sewing area of about 1.5 times or more in the cloth length direction of the work cloth 50 stretched between the front roller 9 and the rear roller 10 by earning the loop of the work cloth 50 downward. Since 50 can be sewn, productivity is improved.
[0032]
In addition, this invention is not limited to the structure of the said embodiment, For example, as follows, it can also be changed and embodied suitably in the range which does not deviate from the meaning of invention.
(1) The cloth holding mechanism 20 is configured by a recess having a substantially Ω-shaped cross section provided in the interlock belt 17 and a pressing member that can be fitted into the recess, and the work cloth placed in the recess is pressed from above with the pressing member. The cloth is fastened by fitting.
(2) A chain or a ball screw is used as a transmission member instead of the drive belt 39.
(3) An adhesive substance, for example, an embroidery adhesive material, on which the work cloth 50 can be easily attached or peeled off is applied to the outer peripheral surface of the interlock belt 17 or a double-sided tape is attached. The work cloth 50 and the interlocking belt 17 are firmly fixed by the adhesive substance, and the work cloth 50 can be prevented from shifting in the left-right direction when driven in the left-right direction.
[0033]
【The invention's effect】
As described above in detail, according to the sewing frame driving device for a sewing machine according to the present invention, the sewing machine device can be made compact, the workability can be improved, and the sewing machine can be driven at a high speed by reducing the weight associated with the compacting. Efficiency can be increased. In addition, since a work cloth having a larger sewing area in the cloth length direction can be sewn, productivity can be improved.
[0034]
[Brief description of the drawings]
FIG. 1 is a perspective view of a sewing frame driving device for a sewing machine according to an embodiment of the present invention.
FIG. 2 is a front view of the sewing frame driving device of the sewing machine.
FIG. 3 is a side view of the sewing frame driving device of the sewing machine.
FIG. 4 is a main part perspective view showing a sewing frame of the sewing machine.
FIG. 5 is a main part perspective view showing a cloth fixing mechanism of the sewing machine.
[Explanation of symbols]
3 Bed 5 Sewing frame 9 Front roller 10 Rear roller 11 Lower roller 12 Support 16 Ball spline shaft 17 Interlock belt 20 Cloth stop mechanism 31 X direction drive mechanism 32 Rail 33 Slide part 35 Slider 39 Drive belt 40 X drive motor 41 Y direction Drive mechanism 42 Y drive motor 50 Work cloth

Claims (4)

A front roller and a rear roller extending in the left-right direction respectively immediately before and behind the bed and at least one lower roller extending in the left-right direction below the bed are rotatably attached to the pair of left and right supports. Sewing frame,
A cloth holding mechanism for spreading the work cloth on the front roller, the rear roller, and the lower roller so that the cloth width direction is along the length direction of each roller and the cloth length direction surrounds each roller to form a loop shape. When,
An X-direction drive mechanism for driving the work cloth in the cloth width direction by moving the sewing frame in the left-right direction;
A Y-direction drive mechanism that drives the work cloth in the cloth length direction by rotationally driving at least one of the front roller, the rear roller, and the lower roller;
The Y-direction drive mechanism includes an interlocking belt that is wound around the front roller, the rear roller, and the lower roller to interlock the rollers,
A sewing frame driving device for a sewing machine, wherein the cloth fastening mechanism includes an attachment member provided on the interlock belt and a covering member that is fitted to the attachment member and sandwiches a work cloth between the attachment member . Wherein the fabric stop mechanism, the workpiece cloth the sewing machine constructed according to claim 1, wherein as the one edge and the other end edge of the fabric length direction is stretched so as to be substantially C-shaped loop and between away Sewing frame drive device. The X-direction drive mechanism includes a guide rail extending in the lateral direction provided in the machine frame of the sewing machine, and a slide portion that engages so as to be horizontal movement on said rail provided on said support, transfer movement of the support The sewing frame drive device for a sewing machine according to claim 1 or 2, comprising an X drive motor driven in the left-right direction via a member. The Y-direction drive mechanism includes the front roller, a ball spline extending in at least one spline engaged inserted through a lateral direction of the rear roller or the lower roller, and a Y drive motor for rotationally driving the ball spline A sewing frame drive device for a sewing machine according to claim 1, 2 or 3.

Images