JP2008237658A - Buttonhole sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a sewing cycle by quickly moving a second hammer to an operation position under a first hammer, regardless of the position of a feeder. <P>SOLUTION: A hammer driving mechanism 10 includes: a direct acting type support mechanism 18 for vertically movably supporting a cutter shaft member 22 to which the first hammer 24 is attached; a punching mechanism 19 for pressurizing the first hammer 24 against a cutter 13; and a punching air cylinder 20 for operating the punching mechanism 19, etc. The cutter shaft member 22 is lowered via a first link member 30 and a second link member connected to the first link member 30 by the retraction driving of the punching air cylinder 20 in the punching mechanism 19. The second hammer 45a is retracted to a waiting position behind the first hammer 24, but is moved to the operation position at the lower side of the first hammer 24 by the advance driving of an air cylinder 53 for downward movement and the retraction driving of an air cylinder 49 for forward movement. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a boring machine that allows a small button hole to be formed with a second hammer in addition to forming an eyelet button hole with a first hammer without changing the knife.

  Conventionally, in a hole sewing machine, after forming a hole seam on a work cloth (or before forming a hole seam), a button hole is formed inside a hole seam (or a position where a hole seam is to be formed). It is equipped with a hammer drive to open the door. The hammer driving device includes a lower knife fixed to the sewing machine frame, a hammer that can move up and down on the upper side of the knife, a hammer mechanism that drives the hammer up and down, and an actuator that drives the hammer mechanism. Etc. are provided.

  For example, a perforated sewing machine described in Patent Document 1 enables a first hammer mounted on a tip of a curved arm member to be pressed against a lower knife by an air cylinder, and further, in a space portion of the arm member. A rotary air cylinder is provided. A rotary body is fixed to the rotary shaft of the rotary air cylinder, and a second hammer is fixed to the tip of a second hammer support plate fixed to the rotary body.

The second hammer always stands by at a high retracted position on the side with respect to the first hammer. After the eyelet stitches are formed, the air cylinder is advanced to form the eyelet buttonholes with the first hammer and the knife. Thereafter, after the formation of the counterbored seam, the second hammer is rotated by the rotary air cylinder to enter the lower side of the first hammer, the air cylinder is driven to advance, and the small hammer is formed by the second hammer and the knife. Is formed.
JP 2001-120865 A (pages 3 to 5, FIGS. 1 and 2)

  In a hole sewing machine, a pair of left and right cloth presser levers are usually provided on the upper surface of the feed base, and the work presser attached to the tip part of these presser foot levers holds the vicinity of the sewing position of the work cloth from both sides. It is like that. In the above-described hole-sewn sewing machine described in Patent Document 1, when the second hammer is moved to the lower side of the first hammer by driving the rotary air cylinder after the formation of the sleep-hole stitch, The cloth presser levers located on both sides immediately interfere.

  Therefore, first, the feed base is moved in advance, and in this state, the second hammer is rotated to the lower side of the first hammer to avoid interference between the second hammer and the presser foot lever. ing. After that, after the feed base is moved back to the rear drilling position, a small button hole is formed with the second hammer. Thus, each time a small button hole is formed by the second hammer, the feed base has to be reciprocated in the front-rear direction, so that the cycle time of the hole-sewn sewing is lengthened and the work efficiency is lowered. There is a problem.

  An object of the present invention is to enable the second hammer to be quickly moved to the lower working position of the first hammer regardless of the position of the feed base, and to shorten the sewing cycle.

  According to a first aspect of the present invention, there is provided a hole sewing machine having a knife for forming a button hole in a work cloth pressed by a pair of left and right cloth pressers, a first hammer disposed on the upper side of the knife, and the first hammer. In a boring machine having a hammer drive mechanism for driving a hammer, a second hammer having a shape different from that of the first hammer, a standby position of the second hammer behind the first hammer, and an operating position below the first hammer And a hammer moving mechanism for moving and driving.

  The second hammer is always retracted to the standby position behind the first hammer, but when the second hammer is used to form a button hole different from the button hole formed by the first hammer, The second hammer is moved to the lower working position of the first hammer by the hammer moving mechanism. That is, the second hammer does not rotate (turn) from the standby position to the operating position, but moves from the rear side to the lower side of the first hammer. Therefore, when the second hammer moves to the operating position, the second hammer does not interfere with the presser foot levers located on both sides of the feed base regardless of the position of the feed base.

  According to a second aspect of the present invention, there is provided the boring machine according to the first aspect, wherein the hammer moving mechanism is configured to move the second hammer downward from a standby position to a position corresponding to the lower surface of the first hammer, and then a second moving cylinder. It has an air cylinder for forward movement that moves the hammer forward to the operating position.

  According to a third aspect of the present invention, there is provided the hole sewing machine according to the second aspect, wherein the air cylinder for downward movement is fixed to a tip portion of a piston rod of the air cylinder for forward movement.

  According to a fourth aspect of the present invention, in the third aspect, the second hammer is fixed to the tip end portion of the piston rod of the air cylinder for downward movement.

  According to the first aspect of the present invention, in the boring machine having a knife, a first hammer disposed on the upper side of the knife, and a hammer driving mechanism for driving the first hammer, the second hammer and the second hammer are on standby. A hammer moving mechanism that moves and drives the position and the operating position, and when the second hammer is used, the second hammer is moved from the standby position behind the first hammer to the lower operation of the first hammer. Since it is moved to the position, it is possible to reliably avoid interference with the work clamp lever of the second hammer regardless of the position of the feed base, and since there is no movement of the feed base, the cycle time of the hole sewing The work efficiency can be improved.

  According to a second aspect of the present invention, the hammer moving mechanism is configured to move the second hammer downward from the standby position to a position corresponding to the lower surface of the first hammer, and then move the second hammer to the operating position. Since it has an air cylinder for forward movement that moves forward, the second hammer moves quickly to the operating position by avoiding interference with the first hammer by two-stage movement of the downward movement and forward movement by these two air cylinders. Can move.

  According to the third aspect of the present invention, since the downward moving air cylinder is fixed to the tip of the piston rod of the forward moving air cylinder, the downward moving air cylinder is mounted on the forward moving air cylinder. Simplify.

  According to the invention of claim 4, since the second hammer is fixed to the tip of the piston rod of the downward movement air cylinder, the attachment of the second hammer to the downward movement air cylinder is greatly simplified.

  In the drilling machine of this embodiment, the second hammer is always retracted to the standby position on the rear side of the first hammer, and when the second hammer is used, the air cylinder for descending movement is driven to advance and advance. The moving air cylinder is driven to retract, and the second hammer is moved from the standby position to the operating position below the first hammer in two stages.

  As shown in FIG. 1, a perforated sewing machine 1 includes a bed base 2 having a substantially rectangular box shape with an open top, a bed portion 3 arranged so as to be fitted into the bed base 2, and the bed portion 3. It has a pedestal part 4 standing from the rear part, an arm part 5 extending forward from the upper part of the pedestal part 4, and the like, and is fixed on a work table (not shown).

  A needle bar 7 having a sewing needle 6 is provided at the front lower part of the arm portion 5 so as to be movable up and down. Although not shown in detail, the rotational force of the main shaft that is rotated by the driving of the sewing machine motor is transmitted to the cam mechanism, and is predetermined. It is driven up and down while swinging left and right by the width. In this case, every time the main shaft rotates twice, the needle bar 7 swings between the left swing position and the right swing position. The arm portion 5 is provided with a hammer drive mechanism 10 for forming eyelet holes in the work cloth.

  The bed portion 3 is provided with a looper base (not shown) provided with two loopers (not shown) so as to face the needle bar 7. These two loopers are driven in synchronism with the vertical movement of the needle bar 7 by rotation of the main shaft through a cam mechanism (not shown). Further, the needle bar 7 and the looper base are integrally rotated around the vertical axis in a horizontal plane by a rotation mechanism (not shown) including a θ-direction drive motor and a gear mechanism provided in the bed portion 3. It has become.

  A feed base 8 on which a work cloth is set is provided on the upper surface of the bed 3. Although not shown in the bed portion 3, an X-direction moving mechanism that moves the feed base 8 in the X direction (left and right direction) by driving the X direction driving motor, and Y by driving the Y direction driving motor. And a Y-direction moving mechanism that moves in the direction (front-rear direction).

  In the bed portion 3, a female base 12 (see FIG. 5) is fixedly disposed on the rear side of the looper base, and a female 13 that forms a eyelet hole in cooperation with a first hammer 24 described later is a female base 12. Is detachably attached. However, the knife 13 is fixed to the knife base 12 so that the upper end of the knife 13 is substantially at the same height as the upper surface of the feed base 8.

  A pair of left and right cloth presser levers 15 and 16 for holding a work cloth are provided on the upper surface of the feed base 8, and the presser foot 15 a and 16 a are attached to the distal ends of the presser foot levers 15 and 16, respectively. These presser foot levers 15 and 16 are driven by an air cylinder (not shown) to be switched between an upper retracted position and a lower pressed position.

  Next, the hammer drive mechanism 10 will be described. The hammer drive mechanism 10 includes a direct-acting support mechanism 18 that supports a cutter shaft member 22 to which a first hammer 24 is attached, a punching mechanism 19 that presses the first hammer 24 against a knife 13, and a punching mechanism 19 A punching air cylinder 20 for operating the mechanism 19 is provided.

First, the support mechanism 18 will be described.
As shown in FIG. 3, a cylindrical hammer support 21 is fitted into the horizontal frame 5a below the arm portion 5 from below and is fixed to the frame 5a. A substantially cylindrical cutter shaft member 22 is fitted inside the hammer support 21, and a first hammer support 23 is fixed to the lower end of the cutter shaft member 22. A first hammer 24 is detachably attached to the lower end of the first hammer support 23. In this case, the first hammer 24 is detachably fixed to the first hammer support 23 by a side fixing screw 25.

  Next, as shown in FIG. 3, the punching air cylinder 20 for driving the first hammer 24 described above is disposed upward in the leg pillar portion 4 of the boring machine 1, and is configured, for example, as a double-acting type. Has been. A lower end portion of the punching air cylinder 20 is rotatably supported by a frame 2a of the bed table 2 via a support pin 27.

Next, the punching mechanism 19 will be described.
As shown in FIG. 3, the support portion 30a of the first link member 30 having a substantially crank shape in a plan view and a substantially inverted L shape in a front view rotates to a first support shaft 31 facing in the left-right direction fixed to the frame 5a. Supported as possible. The drive side end 30b of the first link member 30 is formed in a bifurcated shape, and is rotatably connected to a connecting portion 20b at the tip of a piston rod 20a extending upward from the punched air cylinder 20.

  The arm portion 5 is provided with a second link member 32 extending in the front-rear direction, and is supported at a substantially central portion in the front-rear direction by a second support shaft 33 that is fixed to the frame 5 a and that faces in the left-right direction. Has been. The front end pressing side end 32a and the rear end connecting side end 32b of the second link member 32 are each formed in a bifurcated shape.

  An intermediate link member 34 is disposed between the first and second link members 30 and 32. The connection side end 30c of the first link member 30 is also formed in a bifurcated shape, and the central portion of the first connection pin 35 extending in the left-right direction attached to the connection side end 30c is connected to the intermediate link member 34. ing.

  The bifurcated connecting side end 32b of the second link member 32 and the upper end of the intermediate link member 34 are connected by a second connecting pin 36 facing in the left-right direction. Further, a pressing roller (not shown) is disposed inside the bifurcated pressing side end portion 32 a of the second link member 32, and is rotatably supported by the support shaft 38. The pressing roller is the upper end of the cutter shaft member 22. It contacts from above.

  Here, a part of the outer periphery of the pressing roller is chamfered flat, and the flat surface is in surface contact with the upper end of the cutter shaft member 22. As shown in FIG. 3, a tension coil spring 43 is hung between the engaging pin 41 fixed to the front end surface of the second link member 32 and the engaging pin 42 fixed to the frame 5a on the upper side, so that the second link The front end of the member 32 and the cutter shaft member 22 are biased upward.

Next, a second hammer 45a having a shape different from that of the first hammer 24 and a hammer moving mechanism 47 that moves the second hammer 45a in the vertical direction and the front-rear direction will be described.
As shown in FIGS. 3 and 5, the front end portion of an L-shaped first connection support plate 48 extending rearward and upward is fixed to the left side surface of the first hammer support 23, and the first connection support plate 48. A cylinder body 49a of the forward movement air cylinder 49 is fixed to the upper end of the cylinder.

  In addition to the piston rod 49b, a pair of upper and lower guide shafts 49c in the front-rear direction are provided on the cylinder body 49a of the forward movement air cylinder 49 so as to be able to advance and retreat. Therefore, the vertical first connecting member 50 is fixed to the front end (rear end) of the piston rod 49b and the front end (rear end) of the pair of guide shafts 49c. Therefore, the first connecting member 50 can move back and forth stably and smoothly while being guided by the guide shafts 49c.

  Further, an upper end portion of a second connection support plate 51 having a substantially L shape in side view is fixed to the first connection member 50 by a plurality of fixing bolts 52. A cylinder main body 53 a of the downward moving air cylinder 53 is fixed to the front end portion of the second connection support plate 51. In addition to the piston rod 53b, a pair of front and rear guide shafts 53c in the vertical direction are provided on the cylinder body 53a of the air cylinder 53 for downward movement so as to be able to advance and retreat. A second connecting member 54 facing forward and backward is fixed to the distal end portion (lower end portion) of the piston rod 53b and the distal end portions (lower end portion) of the pair of guide shafts 53c.

  The second connecting member 54 can move up and down stably and smoothly while being guided by the guide shafts 53c. Further, a rear end portion of the second hammer support body 45 is fixed to the second connecting member 54 by a plurality of fixing bolts 55, and a second hammer 45 a is formed at the front end portion of the second hammer support body 45. Yes. Here, as shown in FIG. 4, the second hammer 45 a is a small hammer corresponding only to a part of the straight knife part 13 b of the eyelet part 13 a and the straight knife part 13 b formed on the knife 13, This is for forming a short straight button hole located below the first hammer 24 without replacing the knife 13.

Next, the operation of the perforated sewing machine 1 configured as described above will be described. Here, a so-called rear knife in which a buttonhole is formed after the eyelet seam is formed will be described.
The punching air cylinder 20 is driven to advance during sewing in which the eyelet stitching is formed on the work cloth W.

  As a result, in FIG. 3, the first link member 30 is rotated counterclockwise and the second link member 32 is rotated clockwise by the advancement of the piston rod 20a. The first hammer 24 is located at a standby position indicated by a solid line in FIG. 5 via the shaft member 22 and the first hammer support 23. At this time, since the forward movement air cylinder 49 is driven forward and the downward movement air cylinder 53 is driven backward, the second hammer 45 a is retracted to the standby position on the rear side of the first hammer 24.

  When the eyelet stitching is completed, the punching air cylinder 20 is driven to retract, so that the first link member 30 rotates clockwise and the second link member 32 rotates counterclockwise. The first hammer 24 is lowered via the shaft member 22 and the first hammer support 23 and the work cloth is pressed onto the knife 13 (see the two-dot chain line in FIG. 5). A “hole” is formed in the work cloth. Thereafter, the punching air cylinder 20 is driven to advance, and the first hammer 24 is raised to the original standby position.

  In the case where the sleep stitch is finished on the work cloth, as shown in FIG. 6, first, the air cylinder 53 for lowering movement is driven to advance, and the second hammer 45 a is moved to a position corresponding to the lower surface of the first hammer 24. Be lowered. Next, as shown in FIG. 7, the forward movement air cylinder 49 is driven to retract, and the second hammer 45 a is moved forward to the lower working position of the first hammer 24. Thereafter, as described above, the punching air cylinder 20 is driven to retract.

  At this time, the first and second hammers 24 and 45a are simultaneously lowered through the cutter shaft member 22 and the first hammer support 23, and the work cloth W is pressed onto the knife 13 (see the two-dot chain line in FIG. 7). In cooperation with the straight female portion 13b, a “sleep hole” of only the straight portion is formed in the work cloth. Thereafter, the punching air cylinder 20 is driven to advance and the first hammer 24 is raised to the original standby position. At the same time, the forward movement air cylinder 49 is driven to advance, and the downward movement air cylinder 53 is driven to retract. The second hammer 45a returns to the original standby position.

  As described above, in the boring machine 1 having the knife 13, the first hammer 24 disposed on the upper side of the knife 13, and the hammer driving mechanism 10 that drives the first hammer 24, the second hammer 45 a and the second hammer A hammer moving mechanism 47 that moves and drives 45a between the standby position and the operating position is provided. When the second hammer 45a is used, the second hammer 45a is moved from the standby position on the rear side of the first hammer 24 to the first position. Since the first hammer 24 is moved to the lower operating position, it is possible to reliably avoid interference with the presser foot levers 15 and 16 of the second hammer 45a regardless of the position of the feed base 8. Since this is not accompanied by the movement of 8, the cycle time of the hole sewing can be shortened, and the work efficiency can be improved.

  Further, the hammer moving mechanism 47 moves the second hammer 45a downward from the standby position to a position corresponding to the lower surface of the first hammer 24, and then moves the second hammer 45a forward to the operating position. Since the forward movement air cylinder 53 is provided, the second hammer 45a acts by avoiding interference with the first hammer 24 by the two air cylinders 49 and 53 in two stages of downward movement and forward movement. Can move quickly to position.

  Further, since the descending air cylinder 53 is fixed to the tip of the piston rod 49a of the forward moving air cylinder 49, the mounting of the descending moving air cylinder 53 to the forward moving air cylinder 49 is greatly simplified. Furthermore, since the second hammer 45a is fixed to the tip of the piston rod 53a of the downward movement air cylinder 53, the mounting of the second hammer 45a to the downward movement air cylinder 53 is greatly simplified.

Next, a modified embodiment in which the above embodiment is partially modified will be described.
1) Instead of the downward moving air cylinder 53 and the forward moving air cylinder 49, a downward moving solenoid and a forward moving solenoid may be used.

2) The hammer driving device 10 may be configured such that the first hammer 24 is attached to the tip of the swing arm and the swing arm is driven to swing by an air cylinder.

3) In this embodiment, the downwardly moving air cylinder 53 is fixed to the second connection support plate 51. Accordingly, the air cylinder 53 for downward movement is indirectly fixed to the tip of the piston rod 49a of the air cylinder 49 for forward movement, but the air cylinder 53 for downward movement may be fixed to the first connecting member 50. . Further, the downward moving air cylinder 53 may be directly fixed to the tip of the piston rod 49a. In either case, it is necessary to increase the length of the second hammer 45a.

4) In this embodiment, the hammer moving mechanism 47 is composed of the downward moving air cylinder 53 and the forward moving air cylinder 49, but it may be composed of only the forward moving air cylinder 49. In this case, the second hammer 45a must be made of an elastically deformable member.

It is a side view of the hole sewing machine which concerns on the Example of this invention. It is a front view of a hole sewing machine. It is a side view which shows the internal structure of a hole sewing machine. It is a top view of a knife and the 1st and 2nd hammer. It is a principal part expansion partial side view when a 2nd hammer is a standby position. It is a principal part expansion partial side view when a 2nd hammer descends from a standby position. It is a principal part expansion partial side view when a 2nd hammer is an action position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hole sewing machine 10 Hammer drive mechanism 13 Knife 15 Work clamp lever 15a Work clamp 16 Work clamp lever 16a Work clamp 24 First hammer 45a Second hammer 47 Hammer moving mechanism 49 Forward moving air cylinder 49b Piston rod 53 Downward moving air Cylinder 53b Piston rod

Claims (4)

A knife for forming a button hole in a work cloth pressed by a pair of left and right cloth pressers, a first hammer disposed on the upper side of the knife, and a hammer drive mechanism for driving the first hammer In the hole sewing machine,
A second hammer having a different shape from the first hammer;
A hammer moving mechanism for driving the second hammer over a standby position on the rear side of the first hammer and an operating position on the lower side of the first hammer;
A boring machine characterized by comprising   The hammer moving mechanism includes a downward movement air cylinder for moving the second hammer downward from the standby position to a position corresponding to the lower surface of the first hammer, and then a forward movement for moving the second hammer forward to the operating position. The boring machine according to claim 1, further comprising an air cylinder.   The boring machine according to claim 2, wherein the air cylinder for downward movement is fixed to a tip end portion of a piston rod of the air cylinder for forward movement. 4. The boring machine according to claim 3, wherein the second hammer is fixed to a tip end portion of a piston rod of the descending air cylinder.