TWI525231B - Sewing machine of the sewing machine - Google Patents

Description

Sewing machine cutting device for sewing machine

The present invention relates to a cutting device for a sewn object to be attached to a sewing machine, and more particularly to a sewn material cutting device for a sewing machine that can cut a sewn product such as a cloth or leather without being seamless.

In order to cut off the cloth end sewn by the sewing machine, for example, as disclosed in Patent Document 1, a sewing machine including a cloth end cutting device is proposed. According to such a sewing machine, after the cloth ends are cut, the sewing can be sequentially performed in conjunction with this.

A standard arrangement example of the sewing needle, the hook and the cloth end cutting device in the former sewing machine with the cloth end cutting device is shown, for example, in Fig. 1. Here, the sewing needle 1 is attached to the operator side, and is provided with a notch portion 1a on the right side, and is attached to a front end of a needle bar (not shown) to perform a lifting operation. Further, the conveying direction of the cloth feeding device housed in the sewing frame 2 is in the direction of the arrow A in the drawing. Further, the hook 3 is disposed on the right side of the supply direction L passing through the needle drop position of the sewing needle 1 as viewed from the operator side, and is a vertical hook that rotates in the vertical plane. Further, the vertical hook 3 causes the shuttle tip 3a to enter the right side of the sewing needle 1 in the same direction as the supply direction A, and the stitch 4a of the sewing thread 4 is caught on the right side of the sewing needle 1. The cloth end cutting device 5 sequentially cuts the cloth end by collaborating with the movable cutter 5a that is driven up and down in synchronization with the sewing operation and the fixed cutter 5b fixedly mounted below the movable cutter 5a. On the right side of the needle drop position of the sewing needle 1, the cloth which is cut at the position is sequentially sewn at a position which is at an appropriate distance from the needle drop position in the direction opposite to the supply direction A.

Another constitution is shown in Fig. 2. The configuration shown in Fig. 2 is a cutting mechanism of a sewing machine to which a cloth end cutting device is attached. This sewing machine is arranged such that the notch portion 1a of the needle 1 is disposed toward the right side as viewed from the operator's side. Further, the horizontal hook 6 that is rotationally driven in the clockwise direction as viewed from above is disposed on the right side of the line L along the supply direction of the needle drop position passing through the needle 1, so that the tip 6a is along The direction of the supply direction A enters the right side of the sewing needle 1, and the sewing stitch 4a of the sewing thread 4 is caught on the right side of the sewing needle 1. Further, the cloth end cutting device 5 is disposed at a position on the right side of the needle drop position at a position that is an appropriate distance from the needle drop position in a direction opposite to the supply direction A.

Fig. 3 shows another configuration. The cloth end cutting device is mounted on a sewing machine. The notch portion 1a of the sewing needle 1 is placed toward the left side as viewed from the operator side. Further, the hook 7 is disposed on the left side of the supply direction direction line L passing through the needle drop position of the needle 1 as viewed from the operator side, and is horizontally rotated in the clockwise direction and in the direction of the arrow B in the figure as viewed from above. The horizontal hook. Further, the horizontal hook 7 causes the shuttle tip 7a to enter the left side of the sewing needle 1 in a direction opposite to the supply direction A, thereby catching the sewing stitch 4a of the sewing thread 4 on the left side of the sewing needle 1. Further, the cloth end cutting device 5 is disposed close to the horizontal hook 7 on the right side of the needle drop position.

The configuration shown in Fig. 4 is a configuration disclosed in Patent Document 1 cited above, and here, the cloth end cutting device is attached to the sewing machine. The notch portion 1a of the sewing needle 1 is placed on the right side as viewed from the operator side. Further, the horizontal hook 8 that is rotationally driven in the counterclockwise direction and in the direction of the arrow line E in the drawing when viewed from above is disposed on the left side of the supply direction line L passing through the needle drop position of the sewing needle 1, and The tip 8a enters the right side of the sewing needle 1 in the direction of the supply direction A, thereby catching the stitch 4a of the sewing thread 4 on the right side of the sewing needle 1. The cloth end cutting device 5 is attached to the right side of the needle drop position and is disposed close to the horizontal hook 8 described above.

Such a cloth end cutting device 5 is driven by, for example, a cutter driving mechanism as shown in Fig. 5 . This drive mechanism is a configuration proposed in Patent Document 2. The eccentric amount of the eccentric cam 12 fixed to the upper shaft 11 causes the drive lever 13 to oscillate by the rotational movement of the upper shaft 11 of the sewing machine. This movement causes the cutter drive link 16 to reciprocate up and down via the links 14, 15. The cutting cutter 17 on the driving side is reciprocally moved up and down integrally with the cutter driving link 16, and by the reciprocating movement of the upper and lower sides, the cooperation with the cutting cutter 18 fixed to the fixed side of the meshing position is utilized. Cut the cloth delivered to this location.

In the sewing machine with the cloth end cutting device previously attached to the above-mentioned Figs. 1 and 2, the cloth is cut by the cutting device 5 and then conveyed to the needle drop position, so that the cloth is easy to go straight in the direction of the supply direction A. A position offset is generated. The positional deviation of such a cloth end becomes apparent when the material having a thick cloth thickness or the cutting end of the cloth is curved, and the finished product width from the end of the sewing cloth to the suture becomes uneven, and the sewing is poor. Therefore, there is a problem that the thickness of the cloth is restricted or the shape of the cloth end is restricted in order to secure the sewing quality.

The problem as described above is solved by the configuration shown in Fig. 3. The configuration shown in Fig. 3 is the pinhole edge of the shuttle tip 7a or the needle 1 when the sewing thread 4 is in the ordinary Z-line. The surface of the thread is lifted in a direction opposite to the direction of the line, and as a result, the sewing thread 4 is liable to cause sag, and sewing defects such as broken thread or broken thread are caused by the squeezing.

The configuration shown in Fig. 4 solves the problems caused by Figs. 1, 2, and 3, but the hook and its drive mechanism become a dedicated configuration, which causes new problems in terms of cost. On the other hand, in the double needle sewing machine shown in Fig. 3 or Fig. 4, the cloth end cutting device cannot be disposed, and the double needle sewing machine is horizontally or counterclockwise when viewed from above. The rotary hooks are respectively disposed at the left and right positions of the needle drop position, and two needles are disposed in a direction orthogonal to the supply direction, and the left and right needles and the rotary hook respectively form two parallel stitches.

Further, in addition to the above problems, since the sewing machine with the cloth end cutting device described above removes the driving mechanism of the cutting blade from the driving system of the sewing machine, it is necessary to assemble it to the frame of the sewing machine body. Therefore, the cloth sewing machine is incorporated in the sewing machine body, and the economical burden is increased for the user who does not need the cutting device.

The present applicant has proposed a cloth end cutting device for a sewing machine including a rotary knife (Patent Document 3) for the purpose of providing a cloth end cutting device for a sewing machine as described above, and the cloth end cutting device of the sewing machine can be used. The sewing thread cuts the object to be sewn by a specific uniform width, and the cutting device can be set near the shuttle regardless of the arrangement position of the hook, even if the hook is disposed in the double needle sewing machine at the left and right positions of the needle drop position, It is also possible to cut the object to be sewn at a uniform width simultaneously with the sewing, and further, the cloth end cutting device can be detachably attached to the machine body by the unit which is independent of the sewing machine body.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2003-181177 (Patent Document 2) Japanese Laid-Open Patent Publication No. 2003-181177 (Patent Document 3)

However, the cloth end cutting device of the sewing machine proposed by the applicant of the present invention is a rotary knife and a fixed knife attached to the cutting device, and is cut off from the end portion of the object to be sewn such as cloth or leather, and there is a possibility that the sewing machine cannot be sewn from the object to be sewn. The problem is cut off in the middle of the middle rather than from the end. Therefore, there is a problem in that a portion other than the portion to be cut is also cut, or a portion requiring strength is cut, thereby excessively cutting the object to be sewn or failing to maintain strength. Further, in the embodiment of Figs. 1 to 3, the cutting can be forcibly performed from the middle by the penetration of the movable cutter 5a, but a static penetration force is required, so that it is difficult to protrude due to the difference in material.

The invention of the present invention has been made in view of the above problems, and a first object thereof is to provide a seamless system, and regardless of the thickness or hardness of the material, it can be sewn by making the movable cutter protrude while rotating. The sewn object cutting device of the sewing machine that cuts at any position of the object. Further, in addition to the above object, a second object of the present invention is to provide a position in which the direction of the support shaft (horizontal direction) of the movable frame (rotary blade) can be supported, and the lateral direction of the rotary blade (moving frame) is restricted (in rotation) In the fulcrum direction (moving), the sewing object cutting device of the sewing machine can be stably and effectively cut. Further, in addition to the above object, a third object of the present invention is to provide a cover member provided with a cutting portion for opening a rotary blade at the time of cutting and closing a cutting portion of the rotary blade when not being cut, thereby improving safety. The sewing machine cutting device of the sewing machine. Further, in addition to the above object, a fourth object of the present invention is to provide a sewing machine that can be rotated without rotating the rotary blade at a non-cutting position and rotating the rotary blade when approaching the cutting position, thereby further improving safety. Object cutting device. Further, in addition to the above object, a fifth object of the present invention is to provide a workpiece cutting device which can stably position a rotary blade at a non-cutting position and a cutting position. Further, in addition to the above object, a sixth object of the present invention is to provide an actuating mechanism for moving a rotary blade from a non-cutting position to a cutting position, and providing an opening and closing switch to operate the sewing machine body and the driving mechanism. When the movement is separated, the sewn material cutting device can be cut even when it is not sewn.

In the sewing object cutting device according to the first aspect of the invention, the sewing machine cutting device according to the first aspect of the invention is characterized in that the workpiece is cut and fixed, and includes a fixing frame fixedly attached to the sewing machine body and movablely a movable frame mounted on the fixed frame; a rotating blade rotatably disposed on the movable frame; the fixed frame is provided with: a driving mechanism that drives the rotating blade via a power transmission portion; and an actuating mechanism for rotating the rotating blade from the workpiece The movable frame is moved so that the non-cutting position is moved to the cutting position of the object to be sewn, and the needle plate provided on the side of the base portion of the fixed sewing machine body is provided to be cut off in cooperation with the rotating blade. Fixed knife for sewing.

In order to achieve the above-described second object, the sewing object cutting device of the sewing machine according to the second aspect of the invention is characterized in that the fixing frame is provided with a support shaft that can abut against the movable frame to support the rotation of the rotary blade. Position support mechanism.

In the sewing machine main body cutting device according to the third aspect of the invention, the sewing machine main body is provided with a cover member that opens and closes the cutting portion of the rotary cutter in conjunction with the movement of the movable frame. Further, the lid member is configured to close the cutting portion of the rotary blade when the rotary blade is at the non-cutting position, and to open the cutting portion of the rotary blade when the rotary blade is at the cutting position.

In order to achieve the above-mentioned fourth object, the sewing machine cutting device according to the fourth aspect of the invention is characterized in that the fixing frame is provided with a driving mechanism that opens and closes the driving rotary blade in conjunction with the movement of the movable frame. The first switching mechanism is configured such that when the movable frame is actuated to move the rotary blade from the non-cutting position to the cutting position, the first switching mechanism is turned on, and the driving mechanism is driven to When the movable blade is actuated to move the rotary blade from the cutting position to the non-cut position, the first switching mechanism is turned off, the driving of the drive mechanism is stopped, and the rotation of the rotary blade is stopped.

In the sewing object cutting device of the sewing machine according to the fifth aspect of the invention, the fixing frame is provided with the operating mechanism positioned at a non-cutting position and a cutting position of the rotating blade. Positioning mechanism.

In the sewing object cutting device according to the sixth aspect of the invention, the second switching mechanism is provided in the actuating mechanism, and the second switching mechanism is configured to be disconnected. When the first switching mechanism is turned on, the driving mechanism is not driven. When the first switching mechanism is turned on, the driving mechanism is driven to rotate the rotary blade.

The sewing material cutting device for a sewing machine according to the present invention includes a fixing frame fixedly attached to the sewing machine body, and a movable frame movably mounted to the fixing frame, and a rotating knife rotatably provided in the movable frame for fixing a drive mechanism for driving the rotary blade via a power transmission portion, and an actuating mechanism for moving the movable blade from a non-cutting position of the workpiece to a cutting position of the workpiece to be sewn Further, the needle plate provided on the side of the base portion of the fixed sewing machine body is provided with a fixed blade that cuts the object to be sewn in cooperation with the rotary blade. The sewing material cutting device for a sewing machine according to the present invention has an effect that when the driving mechanism is driven, the rotary blade rotates via the power transmission portion, and the movable frame is actuated by the operating mechanism, and the rotary blade is self-cut. When the broken position is moved to the cutting position, the rotary knife and the fixed knife cooperate with each other on the workpiece to be placed on the base portion, and the sewing object can be cut from any position regardless of the sewing machine body. The sewn material is cut off without excessively cutting the sewn material.

The sewing material cutting device for a sewing machine according to the present invention has an effect of restricting an activity by providing a support mechanism that can abut against a position of a pivot axis in a rotation of the movable frame supporting the rotary blade. The movement (sloshing) of the frame (rotary knife) with respect to the lateral direction of the holder (in the direction of the rotation of the support shaft) enables stable and effective cutting. In other words, when the rotary blade moves in the lateral direction and is separated from the fixed blade, it is difficult to cut the object to be sewn. If the rotary blade is pressed against the fixed blade, the frictional resistance increases, and the load on the drive mechanism increases. Since the movement (sloshing) in the lateral direction (the direction of the fulcrum in the rotation) of the rotary knives (the movable frame) is restricted by the support mechanism, the interval between the rotary knives and the fixed knives can be always kept constant, so that smoothing is possible Cut off.

In the sewing machine main body of the sewing machine according to the present invention, a cover member for opening and closing the cutting portion of the rotary blade in conjunction with the movement of the movable frame is provided, and the cover member is configured such that the rotary cutter is located at the non-cutting When the position is broken, the cutting portion of the rotary blade is closed, and when the rotary blade is at the cutting position, the cutting portion of the rotary blade is opened. In the sewing machine cutting device of the sewing machine of the present invention, the cover member for closing the cutting portion of the rotary blade at the non-cutting position is provided, so that the safety is high. In other words, since the fixed blade is provided on the needle plate provided on the base portion side, when the rotary blade is located at a position (cutting position) near the base portion, the hand does not hit the rotary blade, but the rotary blade is located at the rotary blade. When the position is separated from the base portion (non-cut position), the hand can hit the rotary knife. In the sewing machine cutting device of the sewing machine of the present invention, the lid member closes the cutting portion of the rotary blade located at the non-cutting position, so that the sewing blade does not hit the rotary blade, and the safety is extremely high.

In the sewing material cutting device of the sewing machine according to the present invention, the first switching mechanism that opens and closes the driving mechanism that drives the rotary blade in conjunction with the movement of the movable frame is provided on the fixing frame, and the first switching mechanism is configured as When the movable frame is actuated by moving the rotary blade from the non-cutting position to the cutting position, the first switching mechanism is turned on, and the driving mechanism is driven to rotate the rotary blade, so that the rotary blade is moved from the cutting position. When the movable frame is actuated by the non-cutting position, the first switching mechanism is turned off, and the driving of the driving mechanism is stopped, thereby stopping the rotation of the rotating blade. In the sewing machine cutting device of the present invention, the rotary cutter does not rotate at the non-cutting position, but the first switching mechanism is turned on when the cutting position is approached, and the rotary cutter rotates, thereby providing safety. Further improve the effect.

In the sewing material cutting device for a sewing machine according to the present invention, the fixing mechanism is provided with a positioning mechanism for positioning the operating mechanism at a non-cutting position and a cutting position of the rotary blade, and therefore, the positioning mechanism can be used by the positioning mechanism. The effect of the rotary blade being stably positioned at the non-cutting position and the cutting position.

In the sewing material cutting device of the sewing machine according to the present invention, the second switching mechanism is provided in the operating mechanism, and the second switching mechanism is configured to prevent the driving mechanism from being driven even when the first switching mechanism is turned on. When the first switching mechanism is turned on at the time of turning on, the driving mechanism is driven to rotate the rotating blade. In the sewing machine cutting device of the sewing machine of the present invention, the operation of the sewing machine main body is separated from the operation of the driving mechanism, so that the sewing object can be cut even when not sewn.

The sewing material cutting device 20 of the sewing machine includes a fixing frame 41 fixedly attached to the sewing machine body 21b, and a movable frame 42 movably attached to the fixing frame 41. A rotary blade 34 is rotatably provided to the movable frame 42. The fixed frame 41 is provided with a drive mechanism 37 for driving the rotary blade 34 via the power transmission portion 36, and an actuating mechanism 43 for moving the rotary blade 34 from the non-cut position P1 of the workpiece to the object to be sewn. The movable frame 42 is actuated by cutting the position P2. The needle plate 32 provided on the side of the base portion 22 of the fixed sewing machine body 21b is provided with a fixed blade 38 for cutting the object to be sewn in cooperation with the rotary blade 34. When the drive mechanism 37 is driven by the sewing machine 37, the rotary blade 34 is rotated via the power transmission unit 36, and the movable frame 42 is actuated by the actuating mechanism 43 to rotate the rotary blade 34. When the cutting position P1 is moved to the cutting position P2, the rotary blade 34 and the fixed blade 38 are engaged with each other on the workpiece to be placed on the base portion 22, and can be cut off from any position regardless of whether or not the sewing machine body 21b is sewn. The object to be sewn is thereby effectively cut off the object to be sewn without excessively cutting the object to be sewn.

The sewing material cutting device 20 of the sewing machine is attached to the holder 41, and is provided with a support mechanism 71 that can abut against the movable frame 42 and support the position of the rotation of the rotary blade 34 in the direction of the support shaft 35. Therefore, the activity can be restricted. The movement (sloshing) of the frame 42 (the rotary blade 34) with respect to the lateral direction (the direction of the rotation of the support shaft) of the fixed frame 41 makes it possible to perform stable and effective cutting. In other words, when the rotary blade 34 moves in the lateral direction and is separated from the fixed blade 38, it is difficult to cut the object to be sewn. When the rotary blade 34 is pressed against the fixed blade, the frictional resistance is increased, and the load on the drive mechanism 37 is increased. Large, but the movement (sloshing) of the rotary blade 34 (moving frame 42) in the lateral direction (rotational fulcrum direction) is restricted by the support mechanism 71, so that the interval between the rotary blade 34 and the fixed blade 38 can be always maintained. It is fixed so that a smooth cut can be performed.

The sewing material cutting device 20 of the sewing machine is attached to the movable frame 42 and is provided with a lid member 80 that opens and closes the cutting portion of the rotary blade 34 in conjunction with the movement of the movable frame 42. The lid member 80 is configured to close the cutting portion of the rotary blade 34 when the rotary blade 34 is at the non-cutting position P1, and to open the cutting portion of the rotary blade 34 when the rotary blade 34 is at the cutting position P2. In this manner, the sewing material cutting device 20 of the sewing machine is provided with the lid member 80 that closes the cutting portion of the rotary blade 34 at the non-cutting position P1, so that the safety is high. That is, since the fixed blade 38 is provided on the needle plate 32 provided on the base portion 22 side, when the rotary blade 34 is located at a position (cut position P2) near the base portion 22, the hand does not hit the rotary blade 34. When the rotary blade 34 is located away from the base portion 22 (non-cut position P1), the hand can hit the rotary blade 34. The sewing object cutting device 20 of the sewing machine closes the cutting portion of the rotary blade 34 located at the non-cutting position P1 by the lid member 80, and does not touch the rotary blade 34, so that the safety is extremely high.

The sewing machine cutting device 20 of the sewing machine is attached to the holder 41, and is provided with a first switching mechanism 44 that opens and closes the driving mechanism 37 that drives the rotary blade 34 in conjunction with the movement of the movable frame 42. The first switching mechanism 44 is configured such that when the movable frame 42 is actuated to move the rotating blade 34 from the non-cutting position P1 to the cutting position P2, the first switching mechanism 44 is turned on, and the driving mechanism 37 is driven. When the rotary blade 34 is rotated, and the movable frame 42 is actuated to move the rotary blade 34 from the cutting position P2 to the non-cutting position P1, the first switching mechanism 44 is turned off, and the driving of the drive mechanism 37 is stopped. Thereby, the rotation of the rotary blade 34 is stopped. In this manner, when the sewing object cutting device 20 of the sewing machine is not rotated at the non-cutting position P1, when the cutting position P2 is approached, the first switching mechanism 44 is turned on, and the rotary blade 34 is rotated. Therefore, the security is further increased.

The sewing material cutting device 20 of the sewing machine is attached to the fixing frame 41, and is provided with a positioning mechanism 46 that positions the operating mechanism 43 at the non-cutting position P1 and the cutting position P2 of the rotary blade 34. Since the positioning mechanism 46 is provided in the sewing object cutting device 20 of the sewing machine, the rotary blade 34 can be stably positioned at the non-cutting position P1 and the cutting position P2 by the positioning mechanism 46.

The sewing device cutting device 20 of the sewing machine is provided with the second switching mechanism 68 in the above-described operating mechanism 43. The second switching mechanism 68 is configured such that when the first switching mechanism 44 is turned on, the driving mechanism 37 is not driven, and when the first switching mechanism 44 is turned on, the driving mechanism 37 is driven. The rotary blade 34 rotates. The sewing material cutting device 20 of the sewing machine separates the operation of the sewing machine main body 21b from the operation of the drive mechanism 37, so that the sewn object can be cut even when not sewn.

Further, the sewing material cutting device of the sewing machine will be described in detail. Fig. 6 is a view showing the overall configuration of a sewing machine with a workpiece cutting device. The sewing machine 21 is placed on the base portion 22, and the workpiece cutting control box 23 is attached to the lower side of the base portion 22. Further, the sewing machine 21 includes a drive motor controller 24 and a power switch 25, and further, a sewing machine drive pedal 26 is attached to the lower end of the base portion 22. A changeover switch 27 is attached to the workpiece cutting control box 23, and a rotary blade switch 28 is attached to the upper portion of the sewing machine 21.

In this manner, the sewing machine 21 is disposed on the table top 22a of the base portion 22, the sewing machine drive motor controller 24 is disposed below, and the sewing machine drive pedal 26 is disposed at the lower portion. Further, the power switch 25 and the workpiece cutting control box 23 are mounted on the lower portion of the base portion 22, and in particular, the sewing material cutting control box 23 is attached to the cutting mode and the rotary blade polishing mode during the operation of the sewing machine. When the changeover switch 27 is switched, the rotary blade switch 28 that can be operated in the rotary blade polishing mode is mounted on the sewing machine 21.

In Fig. 6, a needle bar 29 is attached to the head 21a of the sewing machine 21 so as to be movable up and down, and a cutting device 20 is disposed on the right side of the needle bar 29. By the cutting device 20, the object to be sewn such as cloth or leather is cut in conjunction with or independently of the sewing operation of the sewing needle and the hook.

7 to 9 show the details of the above-described head portion, and the needle bar 29 is vertically attached to the lower portion of the head 21a. A needle holder 29a is fixed to the lower end of the needle bar 29. Further, a presser bar 30 is vertically disposed on a side portion of the needle bar 29, and a presser 30a is attached to an end portion of the presser bar 30. Further, an upper supply bar 31 is attached to a side portion of the presser bar 30, and an upper supply mechanism 31a is fixed to the upper supply bar 31. Further, a needle plate 32 is disposed on the base portion 22 along the moving surface of the object to be sewn, and a lower cloth supply mechanism 33 is attached to the lower side of the needle plate 32.

Next, the configuration of the cutting device 20 shown in FIG. 6 including the rotary blade 34, the rotary shaft 35, the drive belt 36, and the drive motor 37 will be described with reference to FIGS. 7 to 9. Further, the cutting device 20 includes stays 39a, 39b, and 39c and a fixing stay 40. The drive motor 37 is attached to the motor mounting bracket 41, and the rotary blade 34 is attached to the movable frame 42. Further, the rotating device includes an ascending lever 43, a first switching mechanism 44, a rotary blade polishing device 45, and a rising lever stopper 46.

The needle bar 29 to which the needle holder 29a is fixed is attached to the head 21a of the sewing machine 21 so as to be movable up and down and swingable on the upper supply mechanism 31a. Further, the presser bar 30 to which the presser 30a is fixed is disposed on the sewing machine 21 so as to be movable up and down. Further, the motor mounting bracket 41 is fixed to the sewing machine 21 by fixing the stays 39a, 39b, 39c, and 40 which are configured to be positionally adjustable in the front-rear direction, the vertical direction, and the left-right direction as viewed from the operator side. The head 21a part.

In the motor mounting bracket 41, a movable frame 42 is movably mounted. A rotating shaft 35 to which a rotary blade 34 is fixed is rotatably provided in the movable frame 42. As shown in FIG. 9, the holder 41 includes side walls 41a and 41b, and a drive motor 37 is fixed to one side wall 41b. Further, the movable frame 42 is disposed between the side walls 41a and 41b and includes side plates 42a and 42b. Furthermore, it is needless to say that the cover body and the movable frame 42 can be provided with covers that cover each. As shown in FIGS. 10(a) and (b), the motor mounting bracket 41 and the movable frame 42 are provided with a winding drive mechanism for driving the rotary blade 34 by a drive motor 37 attached to the motor mounting bracket 41. .

The winding drive mechanism includes a drive wheel 53 mounted on the output shaft of the drive motor 37, a driven wheel 61 mounted on the rotary shaft 35 of the rotary blade 34, a guide pulley 57, a guide pulley 54, and a drive wheel 53 and a guide pulley 57. The drive belt 36 on the guide pulley 54 and the driven wheel 61. In this manner, the drive belt 36 is guided by the intermediate guide wheels 57, 54 thereby forming a particular drive path. Then, in order to prevent the drive belt 36 from being slack, the tension pulley 58 is disposed in the middle, and the drive belt 36 is squeezed from the side by the roller 59a on the tension lever 59, thereby preventing the drive belt 36 from being driven. relaxation.

The movable frame 42 is provided with a first support shaft 55 at the upper portion, a second support shaft 56 at the intermediate portion, and a rotary shaft 35 attached to the lower portion. The guide pulley 57 is rotatably attached to the first support shaft 55. The guide pulley 54 is rotatably attached to the second support shaft 56. The driven wheel 61 is fixedly disposed on the rotating shaft 35. As shown in Figs. 10 and 11, the both ends of the first support shaft 55 project from the side plates 42a and 42b of the movable frame 42, and are guided by the upper guide grooves 41c and 41c formed in the fixed frame 41. Both ends of the second support shaft 56 also protrude from the side plates 42a and 42b of the movable frame 42, and are guided by guide grooves 41d and 41d formed at the lower portions of the fixed frame 41. Therefore, as shown in FIG. 11, the movable frame 42 is attached to the motor mounting mount 41 so that the portion of the rotary blade 34 can be moved in the vertical direction and the front-rear direction when viewed from the operator side.

As shown in FIG. 7, both ends of the second support shaft 56 are rotatably provided at the lower portions of the link members 62, 62, and the upper portions of the link members 62, 62 are rotatably attached to the side walls 41a of the mount 41, 41b. One end of the first support shaft 55 is engaged with a concave portion 43a having a substantially U-shape, and the concave portion 43a is formed at an intermediate portion of the rising rod 43 rotatably attached to one side wall 41a of the fixing frame 41 by the support shaft 60. Lower part. As shown in FIG. 10, an elastic member 67 such as a positioning rod 65 including a locking pawl 66 and a coil spring that biases the locking pawl 66 in the locking direction is provided on the upper portion of the raising rod 43. The rising rod stopper 46 is fixed to the side wall 41b of the fixing frame 41 by screws or the like. A locking recess 46a for locking the locking pawl 66 of the positioning lever 65 is formed in the rising lever stopper 46. Further, a second switching mechanism 68 that is turned on and off by the positioning lever 65 is disposed on the raising lever 43.

As shown in FIG. 10(b), when the locking pawl 66 of the positioning lever 65 is locked to one side of the rising lever stopper 46, the cutting device 20 positions the rotary blade 34 at the non-cutting position P1. As shown in FIG. 10(a), when the locking pawl 66 of the positioning lever 65 is locked to the locking recess 46a of the rising lever stopper 46, the rotary blade 34 is positioned at the cutting position P2.

As shown in Figs. 13 and 14, the support plate 70 is fixed to the lower portion of the side wall 41a of the holder 41 by screws or the like. A support screw 71 is provided on the support plate 70. The support screw 71 is provided with a contact ball (not shown) at the front end 72, and the amount of protrusion of the front end 72 is adjusted by the nut 73. The front end 72 of the support screw 71, that is, the contact ball, can come into contact with the side plate 42a of the movable frame 42, and restrict the movement of the movable frame 42 in the axial direction of the rotary shaft 35, and support the cutting position of the rotary blade 34. A rotary blade upper cover 75 that covers the upper portion of the rotary blade 34 is fixed to the side plate 42b of the movable frame 42 by a coupling member 76. A guide edge 77 is formed on the upper portion of the upper cover 75 of the rotary blade. A cover member 80 is rotatably attached to the lower portion of the head 21a.

The cover member 80 is formed to be substantially The shape includes a substantially horizontally extending upper member 81, an intermediate member 82 having an upper end connected to one end of the upper member 81 and extending in the up and down direction, and an end connected to the lower end of the intermediate member 82 and extending in a substantially horizontal direction. Lower member 83. The lower member 83 is integrally formed with a rotary knife lower cover 85 that covers the lower portion of the rotary blade 34. A bearing plate 86 is formed on the upper member 81. The bearing plate 86 is rotatably coupled to the bearing piece 87 fixed to the lower portion of the head 21a via a support shaft 89. Therefore, the cover member 80 can be tilted about the support shaft 89. Further, the bearing plate 86 is provided with a guide shaft 91 that is slidably guided to the guide edge 77 of the rotary blade upper cover 75. The guide shaft 91 is biased by an elastic member 92 such as a coil spring attached to the support shaft 89, and is always slidably coupled to the guide edge 77 of the rotary blade upper cover 75.

It is configured to transmit the drive of the drive motor 37 to the rotary shaft 35 by the drive belt 36. Further, the fixed blade 38 for cutting the sewing material by the cooperation with the rotary blade 34 is formed on the needle plate 32, and the cutting point formed by the fixed blade 38 and the rotary blade 34 is detachably viewed from the operator side. The right side of the upper supply mechanism 31a is configured to be at a fixed distance from the needle drop point of the sewing needle (not shown) fixed to the needle holder 29a. Further, the locking pawl 66 provided in the raising lever 43 is in a state of being engaged with the rising lever stopper 46, and the movable frame 42 is moved up and down and forward and backward from the operator side in conjunction with the movement. Further, as shown in FIG. 11, the first switch mechanism 44 that is turned on and off by the first support shaft 55 is disposed in the mount 41. The rotary blade polishing device 45 is rotatable from the retracted position in the direction of the operator, and the grindstone is located at a position in contact with the rotary blade 34 during polishing, and is retracted to the retracted position by a spring (not shown).

Next, the configuration of the workpiece cutting control box 23 will be described. As shown in FIG. 12, the device includes a circuit breaker 47, an adapter 48, and a relay 49, and the switch 27 connected to the relay 49 is connected to the sewing machine drive signal line 50 and the constant output signal line 51. .

In the block diagram shown in FIG. 12, the power source is supplied to the power switch 25 of the sewing machine drive motor controller 24, and the total power source is supplied to the adapter 48 via the breaker 47. Further, a power source that converts the voltage via the adapter 48 is supplied to the relay 49. On the other hand, the switch 27 is connected to the changeover switch 27 in such a manner that an output signal (for example, a blower signal) 50 and a constant output signal 51 when the sewing machine is driven by the sewing machine drive motor controller 24 can be selected. The fixed contact is connected to the signal side of the relay 49. Further, a main rotary switch 28 is inserted between the changeover switch 27 of the constant output signal line 51 and the sewing machine drive motor controller 24. On the other hand, the first switching mechanism 44 is connected to the middle of the sewing machine drive motor controller 24 and the relay 49 on the side of the positive signal line 52 in which the two signals are commonly used. Further, the second switching mechanism 68 is connected between the sewing machine drive motor controller 24 and the main rotary switch 28 of the sewing machine drive signal line 50 and the constant output signal line 51. Then, the timing control is performed via the relay 49 by the respective signals, and the power supplied from the adapter 48 is supplied to the drive motor 37.

In the above configuration, it can be used in the following manner. As shown in FIG. 10(b), when the rotary blade 34 is positioned above the table surface 22a of the base portion 22 (non-cutting position P1), it is in a non-cut state. At this time, the raising lever 43 supports the movable frame 42 above, and the locking pawl 66 of the positioning lever 65 is engaged with one side of the rising lever blocking piece 46. Therefore, the rotary blade 34 is positioned at the non-cutting position P1 by the locking pawl 66 and the rising lever stopper 46. When the rotary blade 34 is positioned at the non-cutting position P1, as shown in FIG. 11, the first support shaft 55 is separated from the first switch mechanism 44, and thus the first switch mechanism 44 is turned off. Moreover, as shown in FIG. 14, the guiding edge 77 of the rotating knife upper cover 75 fixed to the movable frame 42 pushes up the guiding shaft 91 of the cover member 80, so that the rotating knife lower cover 85 of the cover member 80 is Rotate downward (clockwise) to cover (close) the cut portion of the rotary blade 34. Therefore, when the rotary blade 34 is positioned above, the rotary blade lower cover 85 covers the rotary blade 34, thereby preventing inadvertent contact with the rotary blade 34.

When the positioning lever 65 is closed against the elasticity of the elastic member 67, the second switching mechanism 68 is turned on, the locking pawl 66 is disengaged from one side of the rising lever stopper 46, and the rising lever 43 is rotatable about the pivot 60. . As shown in FIG. 10(a), when the lift lever 43 is rotated in the counterclockwise direction, the movable frame 42 is pushed down via the first support shaft 55, so that the rotary blade upper cover 75 fixed to the movable frame 42 is moved downward. The guide shaft 91 of the cover member 80 crimped to the leading edge 77 of the upper cover 75 of the rotary blade by the elastic member 92 is also moved downward, as shown in Fig. 15, the lower cover of the cover member 80 85 is rotated to the upper side (counterclockwise direction) to open (turn on) the cut portion of the rotary blade 34.

When the lift lever 43 is rotated in the counterclockwise direction, the movable frame 42 is pushed down via the first support shaft 55 to open the rotary cutter lower cover 85. Therefore, the rotary blade 34 and the table surface 22a provided on the base portion 22 are provided. The fixed blade 38 on the needle plate 32 is in contact. In other words, the rotary blade 34 is moved to the cutting position P2 and is in a state in which the cutting can be performed. At this time, the locking pawl 66 of the positioning lever 65 is locked to the locking recess 46a of the rising lever stopper 46, and the rotary blade 34 is positioned at the cutting position P2. When the rotary blade 34 is positioned at the cutting position P2, as shown in FIG. 15, the first support shaft 55 comes into contact with the first switch mechanism 44, and the first switch mechanism 44 is turned on. Further, when the positioning lever 65 is closed, the second switching mechanism 68 is turned on, and when the positioning lever 65 is opened, the second switching mechanism 68 is turned off. Further, the fixing frame 41 is provided with a support screw 71 that can abut against the movable frame 42 and support the position of the rotating blade 34 in the direction of the support shaft 35 (left-right direction). The support screw 71 adjusts the protruding amount of the front end 72 by the nut 73. The front end 72, that is, the contact ball system abuts against the side plate 42a of the movable frame 42, and the movable frame 42 (the rotary blade 34) is fixed on the rotating shaft with respect to the fixed frame 41. The movement (sloshing) in the axial direction (left-right direction) of 35 supports the cutting position P2 of the rotary blade 34.

As shown in Fig. 10 (b), when the sewing machine drive pedal 26 of Fig. 6 is operated while the rotary blade 34 is positioned at the non-cutting position P1, the sewing machine 21 is driven by the sewing machine drive motor controller 24, thereby It is possible to perform a sewing operation without a cutting operation on a workpiece to be sewn (not shown). When the rotary blade 34 is positioned at the non-cutting position P1, the first switching mechanism 44 is turned off. Therefore, the signal transmitted to the relay 49 is cut off so that the current does not flow into the drive motor 37, and the rotary blade 34 does not. Will rotate.

As shown in Fig. 10 (a), when the rotary blade 34 is positioned at the cutting position P2, the sewing machine 21 is driven by the sewing machine, and as described above, the sewing machine 21 is driven by the sewing machine drive motor controller 24, as shown in Fig. 10 (a). The sewing object shown in the figure starts the sewing operation. Since the first switch mechanism 44 is turned on, the output is transmitted from the sewing machine drive motor controller 24 to the sewing machine drive output signal line 50 shown in FIG. At this time, as shown in FIG. 12, when the changeover switch 27 is switched to the signal line 50 side, a control signal synchronized with the driving of the sewing machine 21 is supplied to the relay 49. Then, the driving voltage supplied from the power switch 25 to the adapter 48 via the breaker 47 is converted into the relay 49. On the other hand, the electric power supplied from the adapter 48 flows into the drive motor 37 by the sewing machine drive signal line 50 synchronized with the drive of the sewing machine 21, and the drive motor 37 is rotationally driven in synchronization with the drive of the sewing machine 21.

As shown in FIG. 10(a), the rotational force of the drive motor 37 is transmitted to the rotary blade 34 fixed to the rotary shaft 35 via the drive belt 36, whereby the rotary cutter 34 performs a rotational motion in synchronization with the drive of the sewing machine 21, Further, the object to be sewn is sewn at the cutting point in cooperation with the fixed blade 38, and the object to be sewn is simultaneously cut.

As described above, as shown in FIG. 10(b), since the rotary blade 34 is in the state of being positioned at the non-cutting position P1, when the positioning lever 65 is closed, the locking of the locking pawl 66 is released, and the second switch is turned off. Mechanism 68 is turned "on". In this state, when the lift lever 43 is operated to move the movable frame 42 downward and the rotary blade 34 is moved to the cut position P2, the first support shaft 55 turns on the first switch mechanism 44 to rotate the drive motor 37. drive. As shown in Fig. 10 (a), the rotational force of the drive motor 37 is transmitted to the rotary blade 34 fixed to the rotary shaft 35 via the drive belt 36, so that the rotary cutter 34 is cut and sewn while being lowered. When the rotary blade 34 is raised by the operation of the raising lever 43, the first switching mechanism 44 is turned off to stop the rotation. In this manner, the cutting device 20 can rotationally drive the rotary blade 34 in accordance with the lowering of the rotary blade 34, so that the cutting device 20 can be cut from any position of the object to be sewn.

On the other hand, when the changeover switch 27 shown in FIG. 12 is switched to the constant output signal line 51 side, when the rotary blade switch 28 is turned on regardless of whether or not the sewing machine 21 is driven, the rotation command signal flows to the relay 49. As a result, the drive motor 37 is driven by the power supply to the drive motor 37 via the breaker 47 and the adapter 48. As a result, the rotary blade 34 is rotated. At this time, the rotary blade 34 can be ground by bringing the grindstone into contact with the rotary blade 34 by the restoring force of the spring in the rotary blade polishing device 45.

The present invention has been described above with reference to the embodiments shown in the drawings. However, the invention is not limited to the embodiments described above, and various modifications can be made within the scope of the technical spirit of the invention. For example, in the above embodiment, the conveyor belt 36 is used as the transmission mechanism for driving the rotary blade 34, but it may be driven by the gear row instead of the conveyor belt 36. Further, instead of the relay 49 shown in Fig. 12, the drive motor 37 may be controlled using a sequencer.

The workpiece cutting device 20 can set the cutting position of the rotary blade 34 in the vicinity of the sewing needle 1. Therefore, the product can be maintained, and the shape of the workpiece can be substantially simultaneously or independently from the sewing regardless of the shape of the object to be sewn. The sewing thread cuts the object to be sewn from any position with a uniform width, thereby improving the quality and productivity of the object to be sewn. In addition, it is not necessary to prepare a special sewing machine provided with the workpiece cutting mechanism, and the sewing machine having the sewn object cutting function can be provided by adding the sewing material cutting device 20 to the conventional sewing machine. Therefore, the sewing machine body can be reduced. The cost.

[Industrial availability]

The invention of the present invention can be widely used as a workpiece cutting device that can be attached to a sewing machine and that cuts the object to be sewn substantially simultaneously with or independently of sewing.

1. . . needle

1a. . . Notch

2. . . Sewing rack

3. . . Vertical hook

3a. . . Shuttle tip

4. . . Sewing thread

4a. . . Coil

5. . . Cloth cutting device

5a. . . Active cutter

5b. . . Fixed cutter

6. . . Horizontal hook

6a. . . Shuttle tip

7. . . Horizontal hook

7a. . . Shuttle tip

8. . . Horizontal hook

8a. . . Shuttle tip

11. . . Upper shaft

12. . . Eccentric cam

13. . . Drive rod

14. . . link

15. . . link

16. . . Cutter drive connecting rod

17. . . Cutting knife

18. . . Cutting cutter (fixed side)

20. . . Sewn material cutting device

twenty one. . . Sewing machine

21a. . . Machine head

21b. . . Sewing machine body

twenty two. . . Base

22a. . . mesa

twenty three. . . Sewn material cutting control box

twenty four. . . Sewing machine drive motor controller

25. . . switch

26. . . Sewing machine drive pedal

27. . . Toggle switch

28. . . Rotary knife switch

29. . . Needle bar

29a. . . Needle holder

30. . . Presser foot

30a. . . Pressing piece

31. . . Upper supply rod

31a. . . Upper cloth supply mechanism

32. . . Needle plate

33. . . Lower supply mechanism

34. . . Rotary knife

35. . . Rotary axis

36. . . Drive belt (power transmission unit)

37. . . Drive motor (drive mechanism)

38. . . Fixed knife

39a. . . Fixed strut

39b. . . Fixed strut

39c. . . Fixed strut

40. . . Fixed strut

41. . . Motor mounting bracket

41a. . . Side wall

41b. . . Side wall

41c. . . Upper guide groove

41d. . . Lower guiding groove

42. . . Activity frame

42a. . . Side panel

42b. . . Side panel

43. . . Rising rod (actuating mechanism)

43a. . . Concave

44. . . First switching mechanism

45. . . Rotary knife grinding device

46. . . Rising bar cover (positioning mechanism)

46a. . . Snap recess

47. . . breaker

48. . . Adapter

49. . . Relay

50. . . Sewing machine drive signal line

51. . . Constant output signal line

52. . . Positive signal line

53. . . Drive wheel

54. . . Guide wheel

55. . . First shaft

56. . . 2nd shaft

57. . . Guide wheel

58. . . Tension wheel

59. . . Tension bar

59a. . . Roll

60. . . Support shaft

61. . . driven wheel

62. . . Link member

65. . . Positioning rod

66. . . Clamping pawl

67. . . Elastic member

68. . . Second switching mechanism

70. . . Support plate

71. . . Support screw (support mechanism)

72. . . front end

73. . . Nut

75. . . Rotary knife upper cover

76. . . Connecting member

77. . . Leading edge

80. . . Cover member

81. . . Upper member

82. . . Intermediate component

83. . . Lower member

85. . . Rotary knife lower cover

86. . . Bearing plate

87. . . Bearing piece

89. . . Support shaft

91. . . Guide axis

92. . . Elastic member

P1. . . Non-cut position

P2. . . Cutting position

Fig. 1 is a perspective view showing a main part of a prior cloth cutting device.

Figure 2 is a perspective view of the main part of another prior cloth cutting device.

Fig. 3 is a perspective view of a main portion of still another prior art cloth cutting device.

Figure 4 is a perspective view of a main portion of still another prior art cloth cutting device.

Figure 5 is a front elevational view of the cutting cutter drive mechanism of the prior cloth end cutting device.

Fig. 6 is a front elevational view showing an embodiment of the sewing machine of the present invention.

Figure 7 is a front elevational view of the handpiece of the sewing machine of Figure 6.

Figure 8 is a right side view of the handpiece of Figure 7.

Figure 9 is a left side view of the handpiece of Figure 7.

Fig. 10 is an explanatory view of the workpiece cutting device according to the present invention, wherein Fig. 10(a) is a front view when the rotary blade is at the cutting position, and Fig. 10(b) is the rotary blade at the non-cutting position (upward position). The positive view of the time.

Figure 11 is a rear elevational view of the sewn material cutting device of Figure 10.

Fig. 12 is a block diagram showing the configuration of a control device for the workpiece cutting device.

Fig. 13 is a perspective view showing a main part of the workpiece cutting device.

Fig. 14 is an explanatory view showing a state in which the workpiece cutting device of Fig. 13 is not cut.

Fig. 15 is an explanatory view showing a state in which the workpiece cutting device of Fig. 13 is cut.

20. . . Sewn material cutting device

twenty two. . . Base

22a. . . mesa

34. . . Rotary knife

35. . . Rotary axis

36. . . Drive belt (power transmission unit)

37. . . Drive motor (drive mechanism)

41. . . Motor mounting bracket

41b. . . Side wall

41c. . . Upper guide groove

41d. . . Lower guiding groove

42. . . Activity frame

43. . . Rising rod (actuating mechanism)

46. . . Rising bar cover (positioning mechanism)

46a. . . Snap recess

53. . . Drive wheel

54. . . Guide wheel

55. . . First shaft

56. . . 2nd shaft

57. . . Guide wheel

58. . . Tension wheel

59. . . Tension bar

59a. . . Roll

61. . . driven wheel

65. . . Positioning rod

66. . . Clamping pawl

67. . . Elastic member

68. . . Second switching mechanism

P1. . . Non-cut position

P2. . . Cutting position

Claims (5)

A sewing material cutting device for a sewing machine, comprising: a fixing frame fixedly attached to a sewing machine body, and a movable frame movably mounted to the fixing frame; a rotating blade is rotatably provided, and the fixing frame is provided with: a driving mechanism that drives the rotating blade via a power transmission portion; and an actuating mechanism for moving the rotating blade from the non-cutting position of the workpiece to the object to be sewn The movable frame is actuated by the cutting position; and the fixed plate provided to the base portion of the fixed sewing machine body is provided with a fixed knife that cooperates with the rotating blade to cut the object to be sewn; and the fixing frame is provided There is a support mechanism that can abut against the movable frame to restrict the movement of the pivot axis in the rotation of the rotary blade and support the cutting position of the rotary blade. The sewing material cutting device of the sewing machine according to claim 1, wherein the sewing machine body is provided with a lid member that opens and closes the cutting portion of the rotary cutter in conjunction with the movement of the movable frame, and the lid member is configured to rotate When the knife is at the non-cutting position, the cutting portion of the rotary blade is closed, and when the rotary blade is at the cutting position, the cutting portion of the rotary blade is opened. The sewing material cutting device of the sewing machine according to claim 1 or 2, wherein the fixing frame is provided with a first switching mechanism that opens and closes a driving mechanism that drives the rotary blade in conjunction with the movement of the movable frame, The first switching mechanism is configured such that when the movable frame is actuated to move the rotary blade from the non-cutting position to the cutting position, the first switching mechanism is turned on, and the driving mechanism is driven to rotate the rotating blade; When the movable frame is actuated by moving the rotary blade from the cutting position to the non-cutting position, the first switching mechanism is turned off, the driving of the drive mechanism is stopped, and the rotation of the rotary blade is stopped. A sewing material cutting device for a sewing machine according to claim 1 or 2, wherein the fixing frame is provided with a positioning mechanism for positioning the operating mechanism at a non-cutting position and a cutting position of the rotary blade. The sewing material cutting device of the sewing machine of claim 3, wherein the second switching mechanism is provided in the actuating mechanism, and the second switching mechanism is configured to be closed even when the first switching mechanism is turned on. The drive mechanism is not driven; when the first switch mechanism is turned on when the switch is turned on, the drive mechanism is driven to rotate the rotary blade.