JP2010057723A - Fabric opener of buttonholing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fabric opener of a buttonholing machine which permits a fabric receiving plate to be moved straight rightward and leftward when a fabric is opened even if a linking mechanism making a rocking motion is used. <P>SOLUTION: A fabric opening means 21 is structured so as to have a reciprocating cylinder 32, a linking mechanism 24 having two links 25 and 26 connected along the direction intersecting the movement direction of a fabric receiving plate 22 at right angles and making a circular arc motion, and a mobile plate 40 connected to the links 25 and 26, respectively and supported on a feeding base 11 so as to linearly move along the movement direction of the fabric receiving plate 22, interlocking with the circular arc motion of the linking mechanism 24. The links 25 and 26 and the mobile plate 40 are connected by one engagement section 38 and an engaged section 38 movably supporting the other engagement section 38 along the links 25 and 26 in the longitudinal directions, and the fabric receiving plate 22 is connected to the linking mechanism 24 through the mobile plate 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cloth opening device for a perforated sewing machine in which a slit formed in a work cloth is opened by movement of a pair of cloth receiving plates arranged on both sides of the slit in a direction away from each other.

  Conventionally, as a type of sewing machine such as an industrial sewing machine, slits such as eyelet holes (button holes) or sleep holes are formed on a part of a work cloth as a sewing object, and over-sew is performed around the slits. There is known a hole sewing machine that can automatically execute (hole sewing).

  Such a perforated sewing machine is provided with a needle bar which is reciprocated in the vertical and horizontal directions at the lower part of the arm part by a drive mechanism, and a bed part provided below the needle bar. In order to form a slit in the work cloth, a looper that is driven synchronously, a feed base that is provided in the bed portion, and the work cloth is set and is moved in the front-rear direction and the left-right direction by the feed mechanism. And a cloth cutting device having a knife receiver (fixed knife) fixedly arranged on the bed portion and a cloth cutting knife (moving knife) that is brought into contact with and separated from the knife receiver. In addition, a cloth opening device for opening a slit formed in the work cloth is disposed on the feed base.

  The front-rear direction is a direction in which the free end side of the arm portion of the sewing machine body is the front and the opposite side is the rear, and the left-right direction is the direction when the free end of the arm portion is viewed from the front. It is.

  As such a cloth opening device, there is a device that saves space by using a link mechanism to reduce the arrangement space in the left-right direction with respect to the feed base (see, for example, Patent Document 1).

  In the cloth opening device using the link mechanism, a pair of cloth receiving plates provided on the feed base so as to be positioned on both left and right sides of the female receiver extending in the front-rear direction, and both cloth receiving plates are provided. It has a presser foot. Then, a slit extending in the front-rear direction is formed on the work cloth placed on both cloth receiving plates by bringing a cloth cutting knife (hammer) into contact with the knife receiver, and both sides of the slit are pressed by both cloth pressers. The slits are opened by moving both cloth receiving plates away from each other. In addition, this cloth opening device is configured by connecting a plurality of links (first link and second link) whose respective intermediate portions are supported by a feed base and swinging at both ends in the front-rear direction. And a pair of left and right link mechanisms set so that the amount of movement (rotation angle) of the free end on the front end side is the same, and the front ends of both cloth receiving plates at the free end on the rear end side and the front end side in both link mechanisms Connecting portions (pins) that are respectively connected to the portion and the rear end portion are provided, and the cloth receiving plate is moved along the left-right direction by operating the link mechanism.

  Then, when performing overlock sewing on the work cloth, the work cloth is placed on the feed base, the work cloth is pressed by the work clamp, the work cloth is held on the cloth receiving plate, and the cloth cutting knife is received by the knife. The cloth cutting knife is brought into contact with and matched with the knife receiver, so that a part of the work cloth sandwiched between the cloth cutting knife and the knife receiver is pressed and a slit is formed. Then, with both sides of the slit of the work cloth pressed by the cloth presser, drive both cloth opening means, and move both cloth receiving plates away from each other, that is, move the left cloth receiving plate toward the left side. By moving the right cloth receiving plate toward the right side, the slit is opened so that the opening width is uniform in the entire region in the front-rear direction.

  In this open state, the needle bar and the looper are driven by the drive mechanism while the work cloth is moved together with the feed base so that the sewing needle attached to the needle bar moves along the periphery of the slit formed in the work cloth. By driving this, over stitching is performed around the slit.

Japanese Patent No. 2722777

  However, in the conventional cloth opening device, since the two links constituting the link mechanism swing, the front ends of the first link and the second link that are the connecting portions with the cloth receiving plate, that is, the pins ( (Connecting part) will move in a circular arc, and the cloth receiving plate and the cloth presser will move with displacement in the front-rear direction when opening the slit that opens the slit formed in the work cloth. There was a problem that it deviated from.

  Therefore, there is a demand for a cloth opening device for a perforated sewing machine that can move the cloth receiving plate linearly in the left-right direction even when using a link mechanism that swings.

  The present invention has been made in view of this point. Even when a link mechanism that swings is used, the cloth receiving plate can be moved linearly in the left-right direction when the cloth is opened. An object is to provide a cloth opening device.

  In order to achieve the above-described object, the feature of the cloth opening device for the boring machine according to the first aspect of the present invention is that the work cloth can be held on the upper surface, and the movement path of the cloth cutting knife is used as a reference. A pair of cloth receiving plates disposed on the feed base so as to face each other in the left-right direction, and the pair of cloth receiving plates along the left-right direction so as to approach or separate from the movement path, respectively. In a cloth opening device for a perforated sewing machine having a pair of cloth opening means for opening and closing a slit of a work cloth formed with a slit by the cloth cutting knife, the cloth opening means outputs: A reciprocating cylinder disposed on the feed base so that a shaft reciprocates along a front-rear direction orthogonal to the left-right direction, and two links connected along the front-rear direction, Reciprocating motion of output shaft A link mechanism that changes to an arc motion along the left-right direction, and a link mechanism that is connected to each of the links and that moves linearly along the left-right direction in conjunction with the arc motion of the link mechanism. A movable plate supported by a feed base, and the link and the movable plate support the engaging portion on one side and the engaging portion on the other side so as to be movable along the longitudinal direction of the link. It has a to-be-engaged part and is connected by the to-be-engaged part and the engaging part, and the cloth receiving plate is connected to the link mechanism via the movable plate.

  By adopting such a configuration, the movable plate can move the cloth receiving plate linearly along the moving direction. In addition, the engaged portion and the engaging portion that connect the link and the movable plate are displaced in the direction orthogonal to the movement direction of the cloth receiving plate generated by the arc motion of the link. Therefore, only the displacement along the moving direction of the cloth receiving plate can be transmitted to the movable plate. As a result, even when a link mechanism that swings is used, the cloth receiving plate can be moved linearly and reliably along the moving direction when the cloth is opened.

  According to a second aspect of the present invention, the cloth opening device for a hole sewing machine according to the present invention is characterized in that, in the first aspect, the engaging portion is a shaft portion and the engaged portion is a groove portion. And by employ | adopting such a structure, an engaging part and the to-be-engaged part which supports this engaging part movably along the longitudinal direction of a link can be provided easily and reliably.

  According to a third aspect of the present invention, the cloth opening device for a boring machine according to the present invention is characterized in that, in the first or second aspect, the link mechanism is configured such that each intermediate portion of the two links serves as the feed base. Both ends of the link mechanism are connected so as to swing, and the engaged portion is formed at each of the free ends of the link mechanism, and the engaging portion is formed at an intermediate portion of the movable plate. It is in the point. By adopting such a configuration, the cloth receiving plate can be moved linearly and more reliably and easily along the moving direction when the cloth is opened even if the link mechanism that swings is used. it can.

  According to a fourth aspect of the present invention, there is provided a cloth opening device for a boring machine according to the present invention, wherein the movable plate and the cloth receiving plate are the cloth receiving device according to any one of the first to third aspects. It exists in the point connected via the cloth opening board which supports a board from the downward direction. And by employ | adopting such a structure, while being able to connect a movable board and a cloth receiving board easily and reliably, the attitude | position of a cloth receiving board can be hold | maintained appropriately.

  According to the cloth opening device for a hole sewing machine according to the present invention, the movable plate can linearly move the cloth receiving plate along the moving direction thereof. In addition, the engaged portion and the engaging portion that connect the link and the movable plate are displaced in the direction orthogonal to the movement direction of the cloth receiving plate generated by the arc motion of the link. Therefore, only the displacement along the moving direction of the cloth receiving plate can be transmitted to the movable plate. As a result, even if a link mechanism that swings is used, the cloth receiving plate can be moved linearly and easily along the moving direction when the cloth is opened.

  The present invention will be described below with reference to embodiments shown in the drawings.

  For convenience of explanation, a schematic configuration of a hole sewing machine provided with a cloth opening device for a hole sewing machine according to this embodiment will be described first with reference to FIG.

  FIG. 1 is a schematic external view showing a main part of a hole sewing machine provided with an embodiment of a cloth opening device for a hole sewing machine according to the present invention.

  The bobbin sewing machine provided with the cloth opening device (hereinafter simply referred to as the cloth opening device) of the bobbin sewing machine according to this embodiment has a basic configuration of a boring machine that performs conventionally well-known bobbin sewing. It is.

  As shown in FIG. 1, the boring machine 1 according to this embodiment includes a sewing machine body 2 and a bottom cover 3 that covers the bottom of the sewing machine body 2. The bottom cover 3 is attached to a sewing machine table (not shown). It has come to be supported.

  The sewing machine body 2 includes a bed portion 2a having a substantially rectangular box shape, a vertical body portion 2b projecting upward at a rear portion shown on the left side of the bed portion 2a in FIG. 1, and an upper portion of the vertical body portion 2b. The arm portion 2c extended so as to extend in parallel with the bed portion 2a toward the front shown on the right side of FIG.

  Here, for convenience of explanation, when the boring machine 1 is installed on a horizontal plane, the upper side (upper side in FIG. 1) of the sewing needle 6 to be described later is on the upper side and the lower side (lower side in FIG. 1). Below, the free end side (the right side in FIG. 1) of the arm portion 2c of the sewing machine body 2 is the front side, the opposite side (the left side in FIG. 1) is the rear side, and the left side when the free end of the arm portion 2c is viewed from the front side. The following description will be made assuming that the front side in the vertical direction in FIG. 1 is left and the opposite side (the back side in the vertical direction in FIG. 1) is right.

  A needle bar 5 is disposed at the free end of the arm 2c shown on the right side of FIG. The needle bar 5 is disposed so that the lower end of the needle bar 5 protrudes toward the bed 2a, and the base end of the sewing needle 6 is detachably attached to the lower end of the needle bar 5. . Further, the needle bar 5 can be moved up and down with a predetermined stroke by a needle bar drive mechanism and a needle swing mechanism (both not shown), and with a predetermined stroke in the left-right direction (in FIG. 1) It can be swung along the vertical direction of the drawing. The needle bar drive mechanism is formed so as to be able to be driven in conjunction with the rotation of a sewing machine main shaft (upper shaft) (not shown) that is rotatably arranged inside the arm portion 2c. It is formed so that it can be driven by a sewing machine motor (not shown) disposed inside the machine. Further, the needle swing mechanism is formed to be drivable by the driving force of the sewing machine motor.

  The bed portion 2 a is provided with a looper facing the needle bar 5 and various drive mechanisms (both not shown) for driving the looper in synchronization with the operation of the needle bar 5.

  The hole sewing machine 1 is provided with a cloth cutting device 8 for forming slits such as eyelet holes (button holes) or sleep holes in a part of the work cloth. The cloth cutting device 8 includes a cloth cutting knife 9 as a moving knife arranged in the arm portion 2c so as to be movable up and down (sometimes arranged in the bed portion 2a and the vertical trunk portion 2b) and the bed portion 2a. 2 has a knife receiver 10 (FIG. 2) as a fixed knife fixed via a knife receiver (not shown). Then, in a state where the work cloth is disposed between the cloth cutting knife 9 and the knife receiver 10, a knife driving mechanism (not shown) is driven to move the cloth cutting knife 9 toward the knife receiver 10. Is brought into contact with the knife receiver 10 so as to be matched, so that a part of the work cloth sandwiched between the cloth cutting knife 9 and the knife receiver 10 is pushed and cut through the work cloth in the thickness direction. Can be formed. Note that the upper end of the knife receiver 10 is disposed so as to have a height position substantially the same as the upper surfaces of a pair of left and right cloth receiving plates 22 described later.

  A feed base 11 on which a work cloth is set is disposed on the upper surface portion of the bed portion 2a. The upper surface portion of the feed base 11 includes left and right parts constituting a part of a cloth opening device 21 to be described later. A pair of cloth receiving plates 22 (FIG. 2) is disposed. A cloth presser 13 is disposed above the pair of cloth receiving plates 22. These cloth pressers 13 are formed so as to be able to contact and separate from the cloth receiving plate 22 by the presser drive mechanism 14. That is, the presser foot 13 and the presser foot drive mechanism 14 are also paired.

  Although not described in detail, the presser drive mechanism 14 includes a presser drive arm 15 provided with a cloth presser 13 at the front end. The presser drive arm 15 is a rear end portion of the upper surface of the cloth receiving plate 22. Further, it is formed so as to be rotatable around a presser support pin 16 disposed horizontally with its axial direction directed in the left-right direction. Then, the presser foot 13 is rotated with respect to the cloth receiving plate 22 by rotating the presser driving arm 15 with the driving force of an actuator (not shown) disposed inside the feed base 11 located on the back side of the cloth receiving plate 22. It can be made to touch. Therefore, the cloth receiving plate 22 is formed so as to hold the work cloth. The cloth presser 13 is supported by the cloth receiving plate 22 and is configured to move together with the cloth receiving plate 22 when the cloth receiving plate 22 moves.

  The feed base 11 is formed in a thin rectangular box shape having an opening at the top as a whole, and is provided between a pair of cloth pressers 13 and has a long opening in the front-rear direction. The feed base 11 is horizontally moved in the front-rear direction and the left-right direction orthogonal to each other with the needle drop point as the origin by a feed mechanism (not shown).

  That is, the work cloth is pressed against and held by the cloth receiving plates 22 provided on the feed base 11 by the cloth presser 13, and in this state, the slit is opened by the cloth opening device 21 described later. The feed base 11 is moved in accordance with the shape, and the edge of the slit is sequentially stitched.

  In addition, as a material of the work cloth, a wide variety of materials such as cloth, leather, etc., in which a slit is formed by the perforated sewing machine 1 and over-stitching is performed are used.

  Since the other configuration of the hole sewing machine 1 is formed in the same manner as a conventionally known hole sewing machine, a detailed description thereof will be omitted.

  Here, an embodiment of a cloth opening device for a boring machine according to the present invention will be described with reference to FIGS.

  2 to 5 show an embodiment of a cloth opening device for a perforated sewing machine according to the present invention, FIG. 2 is an external perspective view of the main part of the overall configuration, and FIG. 3 is a view of the cloth receiving plate of FIG. FIG. 4 is an exploded perspective view of the main part of the cloth opening device on the right side of FIG. 2, FIG. 5 is an enlarged perspective view of FIG. 4, and FIG. 6 is a bottom view of FIG.

  As shown in FIGS. 2 and 3, the cloth opening device 21 of the present embodiment includes a pair of cloth receiving plates 22 and a pair of cloth opening means 23.

  The pair of cloth receiving plates 22 (reference numeral 22 is a generic name for the left cloth receiving plate 22L and the right cloth receiving plate 22R) is formed in a rectangular shape that is long in the front-rear direction as a whole. The cloth receiving plates 22 are arranged on the feed base 11 so as to face in the left-right direction with reference to the movement path of the cloth cutting knife 9 (hereinafter simply referred to as the movement path). That is, both cloth receiving plates 22 are arranged symmetrically with respect to the movement path. Therefore, both the cloth receiving plates 22 are arranged on both the left and right sides of the female receiver 10.

  The pair of cloth opening means 23 (symbol 23 is a general term for the left cloth opening means 23L and the right cloth opening means 23R), as in the case of the two cloth receiving plates 22, in the left-right direction. The pair of cloth receiving plates 22 are held in the pair of cloth receiving plates 22 by moving in the left-right direction so as to approach or separate from the movement path, respectively. Thus, the slit of the work cloth in which the slit is formed by the cloth cutting knife 9 can be opened and closed.

  Therefore, the direction in which the cloth receiving plate 22 moves in the present embodiment is the left-right direction, and the direction orthogonal to the moving direction of the receiving plate 22 is the front-rear direction. The longitudinal direction of the slit is the front-rear direction.

  Since the cloth opening means 23 is symmetrically disposed on the feed base 11, the right cloth opening means 23R will be described below, and the description of the left cloth opening means 23L will be omitted.

  As shown in FIGS. 4 to 6, the cloth opening means 23 </ b> R on the right side of the present embodiment has a link mechanism 24. The link mechanism 24 has two links, a front link 25 disposed on the front side and a rear link 26 disposed on the rear side of the front link 25. Both the front link 25 and the rear link 26 are formed in a flat plate shape that is long in the front-rear direction.

  The front link 25 is supported at the middle part in the longitudinal direction by the front link step screw 27 so as to be rotatable on the feed base 11. That is, the front link 25 is provided with a fulcrum 25F at an intermediate portion in the longitudinal direction, and is supported so as to be rotatable along a horizontal plane around the front link stepped screw 27 disposed at the fulcrum 25F. . Therefore, the front link 25 is formed such that the intermediate portion is supported by the feed base 11 and the free end portions positioned at both ends in the longitudinal direction are rotatable.

  The step screw includes a columnar step portion arranged on the head side and a screw portion having a smaller diameter than the step portion arranged at the center of the tip of the step portion (hereinafter the same). The front link step screw 27 is fitted into a link support hole (not shown) formed in the front link 25, and the screw portion is screwed to the feed base 11.

  Further, the front link stepped screw 27 is provided with a ring-shaped spacer that also serves as a bearing (not shown) so as to be positioned between the front link 25 and the feed base 11. The position of the lower surface of the link 25 in the vertical direction, that is, the height direction from the feed base 11 is determined.

  A link connecting pin 28 for use in connection with the rear link 26 is attached to the rear end portion of the front link 25. The link connecting pin 28 is arranged with its axial direction facing up and down, and is arranged upward so that the tip protrudes upward. An input arm 29 extends rightward on the right side surface of the rear end portion of the front link 25. The right end portion of the input arm 29 is rotatably supported by a support pin 31 that is disposed with its axial direction directed in the vertical direction at a tip portion located on the rear side of the joint 30 extending in the front-rear direction. The front end portion of the joint 30 is attached to and connected to an output shaft 32a of an air cylinder 32 as a reciprocating cylinder. The air cylinder 32 is attached to the feed base 11 along the front-rear direction with the front end of the output shaft 32a as the rear side. In addition, you may comprise so that the front-end | tip of the output shaft 32a of the air cylinder 32 may be attached to the feed stand 11 along the front-back direction.

  The rear link 26 has an intermediate portion in the longitudinal direction located closer to the rear side than the front link 25, and this intermediate portion is rotatably supported by the feed base 11 by a rear link step screw 34. That is, as with the front link 25, the rear link 26 is provided with a fulcrum 26F at an intermediate portion in the longitudinal direction. The rear link 26 rotates along a horizontal plane around the rear link stepped screw 34 disposed at the fulcrum 26F. It is supported freely. Therefore, as for the rear link 26, the intermediate part is supported by the feed stand 11, and the free end part located in the both ends of a longitudinal direction is formed so that rotation is possible.

  The rear link step screw 34 is formed in the same manner as the front link step screw 27, and the rear link step screw 34 is fitted in a link support hole (not shown) formed in the rear link 26. The screw portion is screwed to the feed base 11.

  A link connecting portion 35 is formed at the front end of the rear link 26. The link connecting portion 35 has a long tip formed in a plane U shape with an opening along the longitudinal direction of the rear link 26 for use in connection with the front link 25. In the link connecting portion 35, a link connecting pin 28 disposed at the rear end portion of the front link 25 is fitted and connected. The link connecting portion 35 may be a long hole that is long along the longitudinal direction of the rear link 26.

  Therefore, both links 25 and 26 are connected along the front-rear direction which is a direction orthogonal to the moving direction of the cloth receiving plate 22 so that the respective intermediate portions are supported by the feed base 11 and both ends swing. Has been. In addition, the links 25 and 26 are provided with a link connection point 36 (center of the link connection pin 28) for connecting the links 25 and 26 to the ends adjacent to each other of the links 25 and 26. Further, the swinging strokes of the free ends of the links 25 and 26, that is, the rear end side of the rear link 26 and the front end side of the front link 25 are set to be the same. The links 25 and 26 move the output shaft 32a of the air cylinder 32 forward and backward (expand / contract), whereby the front link 25 rotates about the front link step screw 27, and the front link 25 rotates. The rear link 26 is configured to rotate in the direction opposite to the rotation direction of the front link 25 around the rear link stepped screw 34 in conjunction with the front link 25.

  That is, the link mechanism 24 can change the reciprocating motion of the output shaft 32a of the air cylinder 32 to a circular motion.

  A front engaged portion 37 </ b> F as an engaged portion 37 that is formed long along the longitudinal direction of the front link 25 is formed at a front end portion that is a free end of the front link 25. The front engaged portion 37F is formed in a groove shape having a flat U-shape with an opening that penetrates the front link 25 in the thickness direction. The front engaged portion 37F may be a long hole or a bottomed recess. In other words, as the front engaged portion 37F, any front engaging portion 38F described later may be movable while being in contact with the longitudinal direction of the front link 25.

  A front engagement portion 38F as the engagement portion 38 is fitted and connected to the inside of the front engaged portion 37F. The front engaging portion 38F is formed in a substantially cylindrical shape as a whole. The front engaging portion 38F is attached from below to an intermediate portion of the front movable plate 40F formed in a flat plate shape that is long in the left-right direction. Therefore, the front movable plate 40F is connected to the front link 25. It should be noted that using the fitting portion of the front engagement portion 38F with the front engagement portion 37F as a bearing means that the front engagement portion 38F can move smoothly while contacting the inside of the front engagement portion 37F. Is preferable. Further, the front engaged portion 37F may be formed in a cylindrical shape.

  At both ends in the left-right direction of the front movable plate 40F, long-hole-shaped guide holes 41 that are long in the left-right direction are formed. Then, the movable plate mounting stepped screw 42 is inserted into both guide holes 41 from above, and the front end of the movable plate mounting stepped screw 42 is screwed into the feed base 11 to be screwed. Guided by the movable plate mounting stepped screw 42, it is formed to be linearly movable along the left-right direction. The movable plate mounting step screw 42 is provided with a ring-shaped spacer 43 (FIG. 6) that also serves as a bearing so as to be positioned between the front movable plate 40F and the feed base 11. 11 is positioned in the vertical direction of the lower surface of the front movable plate 40F from 11, that is, in the height direction from the feed base 11.

  Therefore, the front movable plate 40F is supported by the feed base 11 so as to be linearly movable along the left-right direction.

  Further, the guide hole 41 and the movable plate mounting step screw 42 of the front movable plate 40F function as guide means for guiding the front movable plate 40F to move linearly along the left-right direction.

  In the rear end portion which is the free end of the rear link 26, as in the front end portion of the front link 25, a rear engaged portion as an engaged portion 37 formed long along the longitudinal direction of the front link 25. 37B is formed. Thereafter, the engaged portion 37B is formed in a groove shape having a flat U-shape with an opening that penetrates the front link 25 in the thickness direction. The rear engaged portion 37B may be a long hole or a bottomed recess. That is, as the rear engaged portion 37 </ b> B, any rear engaging portion 38 </ b> B, which will be described later, can move as long as it is in contact with the longitudinal direction of the front link 25.

  As in the case of the front engaged portion 37F, a rear engaging portion 38B as the engaging portion 38 is fitted and connected to the inside of the rear engaged portion 37B. The rear engaging portion 38B is formed in a substantially cylindrical shape as a whole. The rear engagement portion 38B is attached from below to an intermediate portion of the rear movable plate 40B formed in a flat plate shape that is long in the left-right direction. Therefore, the rear movable plate 40 </ b> B is connected to the rear link 26. In addition, using a fitting part with the rear engagement portion 37B of the rear engagement portion 38B as a bearing means that the rear engagement portion 38B can move smoothly while contacting the inside of the rear engagement portion 37B. Is preferable. Further, the rear engaged portion 37B may be formed in a cylindrical shape.

  Like the front movable plate 40F, long-hole-shaped guide holes 41 that are long in the left-right direction are formed at both ends in the left-right direction of the rear movable plate 40B. Then, the movable plate mounting step screws 42 are inserted into the guide holes 41 from above, and the tips of the movable plate mounting step screws 42 are screwed into the feed base 11 to be screwed together. Guided by the movable plate mounting stepped screw 42, it is formed to be linearly movable along the left-right direction. The movable plate mounting step screw 42 is provided with a ring-shaped spacer 43 (FIG. 6) that also serves as a bearing so as to be positioned between the rear movable plate 40B and the feed base 11. 11, the position of the lower surface of the rear movable plate 40B in the vertical direction, that is, the height direction from the feed base 11 is positioned.

  Accordingly, the rear movable plate 40B is arranged along the left-right direction, the longitudinal direction of which is the movement direction of the cloth receiving plate 22R, and supported by the feed base 11 so as to be linearly movable along the left-right direction. Yes.

  The guide hole 41 and the movable plate mounting step screw 42 of the rear movable plate 40B function as guide means for guiding the rear movable plate 40B to move linearly along the left-right direction.

  The front movable plate 41F and the rear movable plate 41B have the same shape, and are arranged parallel to each other and symmetrical in the front-rear direction.

  On the upper surface of the left end portion of the front movable plate 40F, the front end portion of the right cloth opening plate 45R formed in a substantially triangular frame shape is attached by two mounting screws 46, and the left end of the rear movable plate 40B. The rear end portion of the cloth spread plate 45R is attached to the upper surface of the portion by two attachment screws 46.

  The cloth opening plate 45R has a bottom portion disposed along the front-rear direction, and a top portion disposed to the right of the middle portion of the bottom portion. A front plate support pin 47 is attached to the left side of the front end portion of the bottom side portion of the cloth spread plate 45R. The front side plate support pin 47 is arranged with its axial direction facing up and down, and is arranged upward so that the tip projects upward. And the front-end | tip part of the front side board support pin 47 is fitted by the front side board connection hole 22a formed in the elongate hole shape long in the front-back direction as a board connection hole provided in the front side of the right cloth receiving board 22R. It is connected.

  A rear plate support pin 48 is attached to the left side of the rear end portion of the bottom portion of the cloth opening plate 45R. The rear side plate support pin 48 is arranged with its axial direction facing up and down, and is arranged upward so that the tip protrudes upward. And the front-end | tip part of the back side board support pin 48 is fitted and connected by the back side board connection hole 22b formed circularly as a board connection hole provided in the back side of the right cloth receiving board 22R.

  The left cloth receiving plate 22 is also supported from below by the cloth opening plate 45L (FIG. 2).

  Below the cloth receiving plate 22R, an opening side stopper 51 for restricting the maximum position of the opening side due to the movement of the cloth receiving plate 22R to the right side, and the maximum of the closing side due to the movement of the cloth receiving plate 22R to the left side. A closing side stopper 52 for restricting the position is provided. That is, the position of the cloth receiving plate 22R on the closing side is positioned by the closing side stopper 52, and the position of the opening side is positioned by the opening side stopper 51. Both stoppers 51 and 52 are attached to the feed base 11 so that their positions can be adjusted along the left-right direction.

  Therefore, in this embodiment, the movable plate 40 (reference numeral 40 is the front movable plate 40F and the rear movable plate) at the free ends at both ends of the link mechanism 24, that is, the rear end side of the rear link 26 and the front end side of the front link 25. The engaged portion 37 (reference numeral 37 is a generic name of the front engaged portion 37F and the rear engaged portion 37B) used for connection with the plate 40B, and the inside of the engaged portion 37. The engagement portion 38 (reference numeral 38 is a general term for the front engagement portion 38F and the rear engagement portion 38B) is provided. The engaging portion 38 is a shaft portion, and the engaged portion 37 is a groove portion. The engaging portion 38 and the engaging portion 38 are supported so as to be movable along the longitudinal direction of the links 25 and 26. This is preferable in the sense that the engaged portion 37 can be easily and reliably provided.

  In addition, as shown in FIG. 4, the front link 25 of the present embodiment includes a fulcrum 25F (center of the front link stepped screw 27) and a movable plate connection point 53F (front engagement portion 38F) as a link ratio (leverage ratio). The ratio of the distance 25La to the distance 25Lb between the fulcrum 25F and the link connection point 36 (the center of the link connection pin 28) is 1: 1. Further, the rear link 26 is also linked to the fulcrum 26F (the center of the rear link stepped screw 34) and the distance 26La between the movable plate coupling point 53B (the center of the rear engagement portion 38B) and the fulcrum 26F. The ratio between the point 36 (the center of the link connecting pin 28) and the distance 26Lb is 1: 1. Further, the distance 25La and the distance 26La have the same dimensions.

  Therefore, the moving amount of the movable plate 40 (reference numeral 40 is a generic name of the front movable plate 40F and the rear movable plate 40B) in the present embodiment is set to be the same.

  The distance 25La and the distance 26La may be different dimensions. Thus, even when the distance 25La and the distance 26La have different dimensions, the movement amounts of the front movable plate 40F and the rear movable plate 40B are the same.

  The cloth opening plate 45 is directly connected to and supported by the movable plate 40 without providing the cloth opening plate 45 (reference numeral 45 is a general term for the left cloth opening plate 45L and the right cloth opening plate 45R). Also good. In this case, the front plate support pins 47 and the rear plate support pins 48 are provided on the movable plate 40.

  The movable plate 40 may be long in the front-rear direction. Further, the movable plate 40 may be provided with the engaged portion 37 and the links 25 and 26 may be provided with the engaging portion 38. In this case, the longitudinal direction of the engaged portion 37 may be disposed along the front-rear direction orthogonal to the longitudinal direction of the movable plate 40.

  As the link mechanism 24, both ends of the link mechanism 24 are fulcrums 25F and 26F, and the engaged portion 37 or the engagement portion 38 used for connection to the movable plate 40 between the fulcrums 25F and 26F and the link connection point 36 is used. And an input point of driving force is provided on the link connection point 36 side from the movable plate connection point 53 (reference numeral 53 is a generic name of the front movable plate connection point 53F and the rear movable plate connection point 53B) (link connection point 36). May be used as a driving force input point). With such a configuration, the distance 25Lb between the fulcrum 25F and the link connection point 36 can be made larger than the distance 25La between the fulcrum 25F, 26F, which is the link ratio, and the movable plate connection points 53F, 53B. As a result, the radius at which the link mechanism 24 moves in a circular arc can be increased, so that the longitudinal displacement caused by the circular movement of the link mechanism 24 can be easily and reliably reduced. Further, since the input point of the driving force is provided on the link connecting point 36 side from the movable plate connecting points 53F and 53B, the driving force required to move the movable plate 40 can be reduced. In other words, a small air cylinder 32 with a small output can be used. Therefore, the air cylinder 36 can be easily downsized.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  FIG. 7 is a schematic view schematically showing the main part in the closed state of the cloth opening device on the right side of the embodiment of the cloth opening device for a hole sewing machine according to the present invention.

  Since the cloth opening device 21 of this embodiment is characterized by the operation of the cloth opening means 23, only the operation of the cloth opening means 23 will be described. In addition, since the pair of left and right cloth opening means 23 of the present embodiment are symmetrically disposed on the feed base 11, the operation of the right cloth opening means 23R will be described below, and the left cloth opening means 23L. The description of the operation is omitted.

  As shown in FIGS. 2, 3 and 7, in the closed state (standby state) where the cloth receiving plate 22R is located at the closed position closest to the movement path, the output shaft 32a of the air cylinder 32 is contracted. The retreated position is maintained, and both links 25 and 26 are in a state along the front-rear direction.

  When the air cylinder 32 is driven from the closed state and its output shaft 32a is extended, the output shaft 32a advances backward as indicated by the upward thick arrow in FIG. As the output shaft 32a advances, the front link 25 rotates counterclockwise in FIG. 7 along the horizontal plane about the fulcrum 25F, and in synchronization with the rotation of the front link 25, the rear link 26 It rotates in the clockwise direction of FIG. 7 along the horizontal plane around 26F.

  That is, the link mechanism 24 changes the direction of the reciprocating motion by the output shaft 32a of the air cylinder 32 to a circular motion.

  The circular arc motion of both the links 25 and 26 is transmitted to the movable plate 40 by the engaged portion 37 and the engaging portion 38 fitted inside the engaged portion 37.

  At this time, the displacement in the front-rear direction generated by the arc motion of both the links 25 and 26 is absorbed when the engaging portion 38 moves inside the engaged portion 37 along the longitudinal direction of the links 25 and 26. . As a result, only the lateral displacement generated by the arc motion of both links 25 and 26 is transmitted to the movable plate 40.

  Therefore, the movable plate 40 linearly moves to the right side with the guide hole 41 constituting the guide means being guided by the movable plate mounting step screw 42. As a result, the cloth receiving plate 22R moves linearly to the right so as to be separated from the movement path together with the cloth opening plate 45.

  Next, when the cloth receiving plate 22R moves to the right and reaches the opening position that is farthest from the preset moving path, the cloth receiving plate 22R enters the open state (operation end state).

  The left fabric receiving plate 22L moves to the left in the same manner. Accordingly, the slits of the work cloth held by the pair of left and right cloth receiving plates 22 are opened.

  When closing the slit of the work cloth, the cloth opening means 23 is operated in the opposite direction, that is, by returning the extended output shaft 32a of the air cylinder 32 to the original position even if the output shaft 32a is reduced. Execute.

  Thus, according to the cloth opening device 21 of the present embodiment, the movable plate 40 can move the cloth receiving plate 22 linearly along its moving direction. In addition, the engaged portion 37 and the engaging portion 38 that connect the links 25 and 26 and the movable plate 40 are in a direction orthogonal to the movement direction of the cloth receiving plate 22 generated by the arc motion of the links 25 and 26. Since the displacement can be absorbed by the engagement portion 38 moving inside the engaged portion 37, only the displacement along the movement direction of the cloth receiving plate 22 can be transmitted to the movable plate 40.

  Therefore, according to the cloth opening device 21 of the present embodiment, even when the link mechanism 24 that swings is used, the cloth receiving plate 22 is linearly surely and easily moved along the moving direction when the cloth is opened. Since it can be moved, even if the slit is opened, it is possible to reliably prevent the position of the work cloth from deviating from a predetermined position.

  Therefore, according to the cloth opening device 21 of the present embodiment, the position of the work cloth does not deviate from a predetermined position when opening the slit formed in the work cloth. Workability can be improved.

  Further, according to the cloth opening device 21 of the present embodiment, since the engaging portion 38 is a shaft portion and the engaged portion 37 is a groove portion, the engaging portion 38 and the engaging portion 38 are connected to the link 25, It is possible to easily and reliably provide the engaged portion 37 that is supported so as to be movable along the longitudinal direction of 26.

  Furthermore, according to the cloth opening device 21 of the present embodiment, the link mechanism 24 is connected so that the middle part of each of the two links 25 and 26 is supported by the feed base 11 and both ends are swung. Since the engaged portions 37 are formed at the free ends at both ends of the mechanism 24 and the engaging portion 38 is formed at the intermediate portion of the movable plate 40, even if a link mechanism that swings is used, When the cloth is opened, the cloth receiving plate 22 can be moved linearly and more reliably and easily along the moving direction.

  Furthermore, according to the cloth opening device 21 of the present embodiment, the cloth opening plate 45 is guided along the left-right direction by the two movable plates 40 parallel to each other, and the driving force of the air cylinder 32 as a drive cylinder is: The link mechanism 24 divides the front and rear into two, and the two movable plates 40 are driven in the left-right direction guided by the two movable plate mounting step screws 42 as a plurality of contact points, so that the cloth opening means 23 is twisted. Stable operation can be ensured.

  Furthermore, according to the cloth opening device 21 of the present embodiment, since the movable plate 40 and the cloth receiving plate 22 are connected via the cloth opening plate 45 that supports the cloth receiving plate 22 from below, the movable plate 40 and the cloth receiving plate 22 can be connected easily and reliably, and the posture of the cloth receiving plate 40 can be appropriately maintained.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.

Schematic external view showing the main part of a hole sewing machine provided with an embodiment of a cloth opening device for a hole sewing machine according to the present invention. 1 is an external perspective view showing the main part of the overall configuration of an embodiment of a cloth opening device for a hole sewing machine according to the present invention. The top view of the principal part of the state except the cloth receiving plate of the cloth opening apparatus of FIG. The disassembled perspective view of the principal part of the cloth opening apparatus of the right side of FIG. Enlarged perspective view of FIG. Plan view of FIG. The schematic diagram which simplifies and shows the principal part in the closed state of the cloth opening apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hole sewing machine 2 Sewing machine main body 8 Cloth cutting device 9 Cloth cutting knife 10 Knife receiving 11 Feed stand 13 Cloth presser 21 Cloth opening device 22 Cloth receiving plate 22a Front side plate connecting hole 22b Rear side plate connecting hole 23 Cloth opening means 24 Link mechanism 25 Front link 27 Front link step screw 26 Rear link 28 Link connection pin 29 Input arm 32 Air cylinder 32a Output shaft 34 Rear link step screw 35 Link connection portion 37 Engaged portion 38 Engagement portion 40 Movable plate 41 Guide hole 42 Movable plate mounting step screw 45 Spreading plate 47 Front plate support pin 48 Rear plate support pin

Claims (4)

A pair of cloth receiving plates disposed on the feed base so that the work cloth can be held on the upper surface and opposed to the left and right directions on the basis of the movement path of the cloth cutting knife;
The pair of cloth receiving plates are moved along the left-right direction so as to approach or separate from the movement path, thereby opening and closing the slit of the work cloth formed with the cloth cutting knife. A pair of cloth opening means;
In a cloth opening device for a hole sewing machine having
The cloth opening means is
A reciprocating cylinder disposed on the feed base such that an output shaft reciprocates along a front-rear direction orthogonal to the left-right direction;
A link mechanism comprising two links connected along the front-rear direction, and changing a reciprocating motion of the output shaft into an arc motion along the left-right direction;
A movable plate connected to each of the links and supported by the feed base so as to move linearly along the left-right direction in conjunction with the arc motion of the link mechanism. And
The link and the movable plate each have an engaged portion that supports the engaging portion on one side and the engaging portion on the other side so as to be movable along the longitudinal direction of the link. Connected with the joint,
The cloth opening device for a boring machine, wherein the cloth receiving plate is connected to the link mechanism via the movable plate.   The cloth opening device for a boring machine according to claim 1, wherein the engaging portion is a shaft portion, and the engaged portion is a groove portion. The link mechanism is connected so that both intermediate portions of the two links are supported by the feed base and both ends swing.
The engaged portion is formed at each of free ends at both ends of the link mechanism,
The cloth opening device for a boring machine according to claim 1 or 2, wherein the engaging portion is formed at an intermediate portion of the movable plate.   The said movable plate and the said cloth receiving plate are connected via the cloth opening plate which supports the said cloth receiving plate from the downward direction, The Claim 1 thru | or 3 characterized by the above-mentioned. A cloth opening device for a hole sewing machine.

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