JP2006087813A - Eyelet holing sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately adjust the pressure of a hammer of an eyelet holing sewing machine on a scalpel to securely form an eyelet and to prevent the damage to the scalpel regardless of whether a worked fabric is thin or thick. <P>SOLUTION: The eyelet holing sewing machine comprises a hammer 8 for punching out the eyelet in the worked fabric W, an air cylinder 9 for driving the hammer, a scalpel base 15, a feed base 16 to move by mounting the worked fabric W, and a moving mechanism for moving the feed base. In the eyelet holing sewing machine, the force to drive the hammer when an eyelet is formed by operating the hammer 8 by the air cylinder 9 for driving the hammer is set according to the thickness of the fabric based on a potentiometer for fabric thickness detection to detect the thickness of the worked fabric W and a fabric thickness detection signal received from the potentiometer for fabric thickness detection; and the air cylinder 9 for driving the hammer is controlled so that the force to drive the hammer is the above set driving force. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, the hammer driving force and the hammer driving time for punching the eyelet hole into the work cloth by pressing the hammer against the knife can be changed according to the cloth thickness, and the knife can be prevented from being damaged when punched with the hammer. About things.

  2. Description of the Related Art Conventionally, an eyelet hole sewing machine has an eyelet hole (or a hole seam formation scheduled portion) that is sewn on a work cloth after (or before) forming a hole seam on a work cloth. There are many things that perforate button holes), a knife fixed to the machine frame, a hammer fixed to an arm member pivotally supported by the machine frame or supported so as to be directly movable, and this hammer An actuator for driving the actuator and a transmission mechanism for transmitting the driving force of the actuator to the arm member have been put to practical use.

For example, a cloth cutting device for a perforated sewing machine described in Patent Document 1 includes a knife fixed to a sewing machine frame via a knife base, an arm member pivotally supported by the sewing machine frame, and an arm member A hammer fixed to the tip of the air cylinder, an air cylinder for driving the hammer, a transmission mechanism for transmitting the driving force of the air cylinder to the arm member, and an arm for receiving the driving force of the air cylinder interposed in the transmission mechanism A cam mechanism or the like that transmits to the member is provided, and the cam mechanism reduces the amount of movement of the hammer during a predetermined period in the vicinity of the approach limit position where the hammer approaches the knife and the approach limit position. The contact sound of the knife is reduced to prevent the knife from being damaged or chipped.
JP 2000-210488 A (Pages 4-5, FIG. 1)

  As described above, in the cloth cutting device for a perforated sewing machine described in Japanese Patent Application Laid-Open No. 2000-210488, when the hammer is punched and driven by the operation of the air cylinder, The hammer movement amount is reduced for a predetermined period at the approach limit position, but the hammer pressing force is always set large for thick objects so that it can be punched even with thick work cloths. In particular, when forming eyelet holes in thin work cloths such as slacks, the pressing force of the hammer acts almost directly on the knife, and the problem is that the knife is easily broken and damaged. is there.

  The eyelet hole sewing machine according to claim 1 is a hammer for punching eyelet holes in a work cloth and an actuator for driving the hammer, a knife base having a knife, a feed base for moving the work cloth, and a moving mechanism thereof. In the eyelet-operated sewing machine equipped with a cloth thickness information acquisition means for acquiring the cloth thickness information on the cloth thickness of the work cloth, and the hammer is operated by the driving actuator based on the cloth information received from the cloth thickness information acquisition means. Hammer driving force setting means for setting the hammer driving force when forming the eyelet hole according to the cloth thickness, and control for controlling the hammer driving actuator so that the hammer driving force is set by the hammer driving force setting means Means.

  At the time of hole sewing, the cloth thickness information of the work cloth used for hole sewing is acquired in advance by the cloth thickness information acquisition means, and the hammer corresponding to the cloth thickness is obtained based on the cloth thickness information received from the cloth thickness information acquisition means. The driving force is set in advance, and when forming the eyelet hole by the hammer operation, the eyelet hole is formed in the work cloth with the hammer driving force optimum for the work cloth set in advance.

  That is, the hammer presses the knife with a large pressing force suitable for a thick object, but presses the knife with a small pressing force suitable for a thin object. Therefore, regardless of the thickness of the cloth, a cut hole is formed in the work cloth, and destructive pressing force does not act on the knife.

  According to a second aspect of the present invention, the cloth thickness information acquisition means detects the amount of rotation of the presser foot supporting member that supports the presser foot that presses and holds the work cloth with a potentiometer. It is configured.

  According to a third aspect of the invention, the hammer driving force setting means has a driving force setting table in which the cloth thickness of the work cloth and the hammer driving force are associated with each other. .

  According to a fourth aspect of the invention, the eyelet sewing machine according to any one of claims 1 to 3, wherein the driving actuator includes an air cylinder and a regulator that adjusts a pressure of the pressurized air supplied to the air cylinder. The means adjusts the pressure of the pressurized air through a regulator.

  According to a fifth aspect of the invention, the eyelet sewing machine includes a direct-acting hammer drive mechanism that drives the hammer up and down in parallel with the knife.

  The eyelet punching machine according to claim 6 includes a hammer for punching the eyelet hole in the work cloth and an actuator for driving the hammer, a knife base having a knife, a feed base for moving the work cloth and a moving mechanism thereof. In the provided eyelet sewing machine, the cloth thickness information acquisition means for acquiring the cloth thickness information on the cloth thickness of the work cloth, and the driving time setting table in which the cloth cloth thickness information and the hammer driving time are associated with each other. Hammer driving time setting means for setting the hammer driving time according to the cloth thickness when the hammer is operated by the driving actuator to form the eyelet hole based on the cloth thickness information received from the cloth thickness information acquiring means, and the hammer And a control means for controlling the hammer driving actuator so that the hammer driving time set by the driving time setting means is obtained.

  At the time of hole sewing, the cloth thickness information of the work cloth used for hole sewing is acquired in advance by the cloth thickness information acquisition means, and the hammer corresponding to the cloth thickness is obtained based on the cloth thickness information received from the cloth thickness information acquisition means. The drive time is set in advance, and when forming the eyelet hole by the hammer operation, the eyelet hole is formed in the work cloth with the hammer drive time optimal for the work cloth set in advance.

  That is, the pressing time for pressing the knife with the hammer is a long time suitable for a thick object, but a short time suitable for the thin object. Therefore, regardless of the cloth thickness, the eyelet is formed in the work cloth, and the pressing force is applied for a time that does not damage the knife.

  According to the first aspect of the present invention, the hammer for punching the eyelet hole in the work cloth and the actuator for driving the hammer, the knife base having the knife, the feed base for moving the work cloth and the moving mechanism are provided. The provided eyelet sewing machine includes cloth thickness information acquisition means, hammer driving force setting means, and control means, and presets the hammer driving force according to the cloth thickness of the work cloth used for hole sewing. Therefore, when the eyelet hole is formed by operating the hammer, the eyelet hole can be surely formed regardless of whether the work cloth is thin or thick. Moreover, in the case of a thin object, since a large destructive pressing force does not act on the knife, the knife can be reliably prevented from being damaged.

  According to the invention of claim 2, the cloth thickness information acquiring means is configured to detect the rotation amount of the cloth presser supporting member that supports the presser foot that presses and holds the work cloth with the potentiometer. It is possible to accurately detect the amount of rotation of the presser foot support member. Furthermore, since the cloth thickness is detected by the potentiometer, the cloth thickness information acquisition means can be reduced in size, weight, and cost.

  According to the invention of claim 3, the hammer driving force setting means has a driving force setting table in which the cloth thickness of the work cloth and the hammer driving force are made to correspond to each other. The hammer driving force with respect to can be set quickly and easily. Other effects similar to those of the first or second aspect are achieved.

  According to a fourth aspect of the present invention, the driving actuator has an air cylinder and a regulator for adjusting the pressure of the pressurized air supplied to the air cylinder, and the control means controls the pressure of the pressurized air through the regulator. Therefore, the pressure adjustment of the pressurized air to obtain the optimum hammer driving force for the cloth thickness due to the operation of the air cylinder can be easily set electrically by the air regulator. Other effects similar to those of any one of claims 1 to 3 are provided.

  According to the invention of claim 5, since the direct acting hammer drive mechanism for driving the hammer up and down in parallel with the knife is provided, the hammer can be lowered in parallel with the knife after forming the eyelet hole. Therefore, the pressing force by the hammer can be applied equally to the knife, and the effect of preventing the knife from being damaged can be further enhanced. Other effects similar to those of any one of claims 1 to 3 are provided.

  According to the invention of claim 6, the hammer for punching the eyelet hole in the work cloth, the actuator for driving the hammer, the knife base having the knife, the feed base for moving the work cloth, and the moving mechanism thereof. The provided eyelet sewing machine includes cloth thickness information acquisition means, hammer drive time setting means, and control means, and presets a hammer drive time according to the cloth thickness of the work cloth used for hole sewing. Therefore, when the eyelet hole is formed by operating the hammer, the eyelet hole can be surely formed regardless of whether the work cloth is thin or thick. In addition, the pressing time for pressing the knife with the hammer is an optimal time according to the cloth thickness, and since a destructive large pressing force does not act on the knife, the knife can be reliably prevented from being damaged.

  The electronic eyelet hole hoisting machine of the present embodiment can reliably form eyelet holes in the work cloth used for hole sewing, while preventing the knife from being damaged or chipped when forming eyelet holes in thin work cloths. I can do it.

  As shown in FIG. 1, the electronic eyelet sewing machine 1 includes a knife 5 fixed to a frame 2 a of a bed 2 via a knife base 15, and a direct-acting support mechanism 6 to a frame 3 a of an arm 3. A cutter shaft member 7 supported so as to be movable up and down via a hammer, a hammer 8 fixed to the lower end of the cutter shaft member 7 and having a female receiving surface 8c at the lower end, and hammer driving air for driving the hammer 8 A cylinder 9 (which corresponds to a hammer driving actuator), a transmission mechanism 10 for transmitting the driving force of the hammer driving air cylinder 9 to the hammer 8, a presser driving mechanism 60 for driving the presser foot 65, and the like are provided. .

  By the way, in the arm part 3 of the electronic eyelet hole sewing machine 1, a needle bar up / down swing drive mechanism that swings left and right while moving a needle bar having a sewing needle up and down at the lower end, and a needle bar that turns the needle bar. Although various mechanisms necessary for sewing, such as a turning mechanism, are provided, the description thereof is omitted because it is not directly related to the present plan.

  As shown in FIG. 1, a feed base 16 on which the work cloth W is placed is provided on the upper surface portion of the bed portion 2. The feed base 16 has a thin rectangular box shape as a whole, and a portion facing the knife 5 is opened by a notch.

  In the bed portion 2, an X-direction drive motor 96 (see FIG. 9) and an X-direction drive mechanism for moving the feed table 16 in the X direction (left and right direction), and a Y direction drive for moving in the Y direction (front and rear direction). A motor 98 (see FIG. 9) and a Y-direction drive mechanism are provided. The knife base 15 is placed and fixed on the frame 2 a of the bed portion 2, and the knife 5 is fixed to the knife base 15 so that the upper end of the knife 5 is substantially at the same height as the upper surface of the feed table 16.

  Next, the linear motion type support mechanism 6 that supports the cutter shaft member 7 having the hammer 8 attached to the lower end so as to be movable up and down will be described with reference to FIGS. 1 and 3 to 5.

  A circular mounting hole 2b is formed in the horizontal frame 3a on the lower side of the arm portion 3, and a substantially cylindrical shape having a substantially annular mounting flange portion 20a on the lower side so as to be fitted into the mounting hole 2b from the lower side. The holder member 20 is disposed, and is fixed from below by a plurality of fixing bolts 21. A cylindrical hammer support 22 is fitted into the holder member 20 from below.

  However, as shown in FIG. 6, chamfered portions 22a having a predetermined width are formed on the front and rear upper half portions of the hammer support 22, respectively, and the holder member 20 corresponding to the chamfered portions 22a. The front and rear sides are respectively provided with pivot support wall portions 20b, and the chamfered portions 22a abut against the corresponding pivot support wall portions 20b from the inside, thereby preventing the hammer support 22 from rotating. ing. However, the inner diameter of the holder member 20 is slightly larger than the outer shape of the hammer support 22.

  As shown in FIG. 6, the hammer support 22 is formed with small-diameter pin holes 22b facing each other on the lower side of the chamfered portion 22a, and the pivot support wall portion 20b has the small-diameter pin holes 22b. A large-diameter pin hole 20c having an inner diameter larger than the diameter is formed in an opposing manner. Therefore, the stepped pivot pin 23 has the small diameter portion 23a fitted into the small diameter pin hole 22b and the large diameter portion 23b fitted into the large diameter pin hole 20c, whereby the hammer support 22 is attached to the holder member 20. The stepped pivot pin 23 is supported so as to be swingable about the swing center.

  However, as shown in FIG. 5, the large-diameter portions 23b of the stepped pivot pins 23 are fixed with set screws 24 from above, whereby the stepped pivot pins 23 are rattled in the front-rear direction and the vertical direction. Can be reliably prevented. Then, the substantially cylindrical cutter shaft member 7 is fitted inside the hammer support body 22, the hammer connecting body 25 is fixed to the lower end portion of the cutter shaft member 7, and the hammer 8 is attached to and detached from the lower end of the hammer connecting body 25. Installed as possible.

  Here, as shown in FIGS. 3 and 5, the upper end surface of the hammer 8 is in contact with the lower end surface of the hammer connecting body 25, and the positioning pin 8 a provided on the hammer connecting body 25 is in contact with the right end of the hammer 8. In this state, by engaging the engaging portion 8b of the hammer 8 with the hook portion 26a at the lower end portion of the connecting lever 26 rotatably provided on the hammer connecting body 25, the hammer 8 is brought into contact with the lower end portion of the hammer connecting body 25. They are connected together.

  An adjustment screw 27 is screwed onto the upper end portion of the connecting lever 26. When the adjustment screw 27 is turned clockwise, the hammer 8 can be firmly pressed and fixed by the hook portion 26a, and the adjustment screw 27 is anti-rotated. When it is turned clockwise, the hook portion 26a is separated from the engaging portion 8b, so that the hammer 8 can be removed.

  By the way, as shown in FIG. 5, the lower end part of the sliding surface (inner peripheral surface) of the hammer support body 22, the height direction middle part of the outer peripheral surface of the hammer support body 22, the holder member 20 and the frame 3a Oil seals 28 to 30 are respectively provided at the contact corners. However, the ring plate 31 is screwed to the lower end of the hammer support 22 at a plurality of locations so that the oil seal 28 is not removed. For this reason, the oil seals 28 to 30 prevent the lubricating oil used in the electronic eyelet sewing machine 1 from falling downward through the sliding surface between the hammer support 22 and the holder member 20. ing.

  Incidentally, a chamfered portion 7 a having a predetermined length is formed on the left side of the upper end portion of the cutter shaft member 7, and a detent pin 32 that contacts the chamfered portion 7 a is screwed to the hammer support 22. Is abutted against the chamfered portion 7a so that the cutter shaft member 7 is restricted from rotating.

  Next, the hammer driving air cylinder 9 for driving the hammer 8 is disposed upward in the leg column portion 4 of the electronic eyelet sewing machine 1, and is configured, for example, as a double-acting type. A lower end portion of the hammer driving air cylinder 9 is pivotally supported by a frame 2a of the bed portion 2 via a pivot pin 34 so as to be rotatable.

  Next, the transmission mechanism 10 will be described. As shown in FIGS. 1 and 2, the pivotal support portion 40a of the first link member 40 having a substantially crank shape in plan view and a substantially inverted L shape in front view is fixed to the frame 3a. Further, it is pivotally supported by the first pivot shaft 41 in the front-rear direction. The driving side end 40b of the first link member 40 is formed in a bifurcated shape and is rotatably connected to a connecting portion 9b at the tip of a piston rod 9a extending upward from the hammer driving air cylinder 9.

  On the other hand, the arm part 3 is provided with a second link member 42 extending in the left-right direction, and pivots around a second pivot shaft 43 in the front-rear direction fixed to the frame 3a at a substantially central part in the left-right direction. It is pivotally supported. The left pressing side end 42a and the right connecting side end 42b of the second link member 42 are each formed in a bifurcated shape.

  By the way, between these first and second link members 40, 42, an intermediate link member 44 having a generally square shape in front view is disposed. A substantially straight relief hole 44a is formed in a substantially lower half of the intermediate link member 44 in order to allow the cutter shaft member 7 to be lowered to a lower cutting position by manual operation.

  The connection side end portion 40c of the first link member 40 is also formed in a bifurcated shape, and the center portion of the first connection pin 45 facing forward and backward attached to the connection side end portion 40c is engaged and connected to the escape hole 44a. ing. Further, the bifurcated connection side end portion 42 b of the second link member 42 and the upper end portion of the intermediate link member 44 are connected by a second connection pin 46 in the front-rear direction. Further, a pressing roller 47 is disposed inside the bifurcated pressing side end portion 42 a of the second link member 42, and is pivotally supported by a pivot shaft 48. The pressing roller 47 is the upper end of the cutter shaft member 7. It contacts from above.

  Here, a part of the outer periphery of the pressing roller 47 is chamfered flat, and the flat surface is in surface contact with the upper end of the cutter shaft member 7. Incidentally, as shown in FIG. 4, a notch portion 7b is formed from the right side at the upper end portion of the cutter shaft member 7, and an engagement pin 7c facing in the front-rear direction is formed so as to cross the notch portion 7b. It is attached. On the other hand, the vertical wall portion of the engagement plate 49 bent in an L shape in front view is fixed to the right end portion of the pressing roller 47 with a screw 50, and the horizontal wall portion of the engagement plate 49 is below the engagement pin 7c. Is engaged from.

  As shown in FIG. 1, a tension coil spring 53 is hooked between an engagement pin 51 fixed to the front end surface in the vicinity of the left end of the second link member 42 and an engagement pin 52 fixed to the upper frame 3a. The left end of the second link member 42 is biased upward by the spring force of the tension coil spring 53, and the cutter shaft member 7 is also biased upward via the engagement plate 49.

  Next, the hammer operation of the electronic eyelet hole sewing machine 1 configured as described above will be briefly described. As shown in FIG. 1, with the piston rod 9a of the hammer driving air cylinder 9 in the advanced state and the cutter shaft member 7 positioned at the raised standby position, the work cloth W is placed on the feed base 16. Positioning at a predetermined position and operating the start / stop switch 17 (refer to FIG. 9) before forming a hole seam on the work cloth W on the feed base 16, as shown in FIG. The piston rod 9a of the driving air cylinder 9 is driven to retract.

  As a result, the first link member 40 rotates clockwise around the first pivot shaft 41 as the pivot center, and accordingly, the second link member 42 is moved to the second pivot shaft via the intermediate link member 44. The cutter shaft member 7 is rotated counterclockwise about the rotation center 43, and the cutter shaft member 7 is pushed down to the lower cutting position via the pressing roller 47 at the pressing side end 42 a of the second link member 42. At this time, the work cloth W is pressed against the knife 5 by the hammer 8, and an eyelet hole is perforated inside the portion where the work cloth W is scheduled to be formed.

  Here, when the piston rod 9a of the hammer driving air cylinder 9 is retracted, the first link member 40 rotates clockwise around the first pivot shaft 41. A triangle is formed by the center X, the center Y of the first connecting pin 45, and the center Z of the second connecting pin 46, thereby forming a toggle mechanism (so-called boost mechanism).

  Therefore, the clockwise rotation of the first link member 40 increases the opening angle α between the side XY consisting of X and Y and the side YZ consisting of Y and Z, and the piston rod 9a is retracted. A force that pushes up the second connecting pin 46 with a torque larger than the driving force is generated. Therefore, even with a small hammer driving air cylinder 9, the hammer 8 can generate a cutting force as high as 800KN, which is necessary for forming the eyelet hole.

  Thereafter, when the piston rod 9a of the hammer driving air cylinder 9 is advanced, the first link member 40 rotates counterclockwise as shown in FIG. At this time, the first link pin 45 of the link side end 42b of the first link member 40 only moves downward in the escape hole 44a, and does not pull down the intermediate link member 44 downward.

  However, due to the spring force of the tension coil spring 53 mounted on the second link member 42, the second link member 42 is connected via the engagement plate 49 and the engagement pin 7c simultaneously with the clockwise rotation. The cutter shaft member 7 is pulled up to the upper standby position, and the hole sewing is executed after the feed base 16 has moved to the sewing start position.

  Next, a presser drive mechanism 60 for switching and driving the presser foot 65 that presses and holds the work cloth W on the upper surface of the feed base 16 between the press position and the release position will be described with reference to FIG. However, the presser foot drive mechanism 60 includes a right side presser foot drive mechanism 60A on the right side of the rear end portion of the feed base 16 and a left side presser foot drive mechanism 60B on the left side of the rear end portion of the feed base 16. The right presser driving mechanism 60A will be described.

  On the upper surface on the right side of the rear end portion of the feed base 16, the pivotal support portion of the swing lever 61 is pivotally attached to the left and right pivot support shafts 62 via a pivot support block 63. The rear end portion of the presser foot 64 is fixed to the upper end portion of the swing lever 61 by a bolt, and the center portion in the front-rear direction of the presser foot 65 is pivoted to the front end portion of the presser foot lever 64 by a pivot bolt 66. It is worn.

  A connecting portion 61 a bent in a U shape is formed at the lower end of the swing lever 61. On the other hand, the upper end portion of the clamp lever 72 is fixed to the outer side of the connecting shaft 67 in the left-right direction, and the rear end portion of the presser driving lever 68 is fixed to the inner side of the connecting shaft 67. Is connected to the connecting portion 61a.

  A presser air cylinder 69 is provided rearward on the lower side of the feed base 16, and the rear end portion of the presser air cylinder 69 is swung up and down by a left and right pivot pin 70 supported by the frame of the feed base 16. It is pivotally possible. A block-like connecting member 71 is fixed to the rear end portion of the piston rod 69 a extending rearward from the presser air cylinder 69, and the lower end portion of the clamp lever 72 is rotated by the pivot pin 73 at the rear end portion of the connecting member 71. It is pivotally supported.

  When the piston rod 69a of the presser air cylinder 69 is driven to retract, the upper end portion of the swing lever 61 moves backward via the clamp lever 72 and the presser drive lever 68 as shown by the solid line in FIG. The right presser foot 65 is raised to the upper retracted position. On the other hand, when the piston rod 69a of the presser air cylinder 69 is driven forward, the upper end of the swing lever 61 moves forward as shown by a two-dot chain line in FIG. The position is lowered to press the upper surface of the feed base 16.

  By the way, the base end portion of the sector-shaped sector gear 75 is fixed to the outside of the connecting shaft 67, and the sector gear 75 and the gear 77 fixed to the drive shaft of the cloth thickness detecting potentiometer 76 disposed on the rear side mesh with each other. is doing. Therefore, since the sector gear 75 rotates simultaneously with the lowering of the presser foot 65 from the upper open position to the lower press position, the volume value of the cloth thickness detecting potentiometer 76 changes via the gear 77.

  That is, the cloth presser 65 is a pressing position where the upper surface of the feed table 16 is directly pressed, and the cloth thickness detecting potentiometer 76 when the work cloth W is not placed on the feed table 16 is “0”. Is the reference volume value V0.

  Next, an outline of the control system of the electronic eyelet hole sewing machine 1 will be described based on the block diagram of FIG.

  A control device 80 of the electronic eyelet-hole sewing machine 1 includes a microcomputer including a CPU 81, a ROM 82, and a RAM 83, and an input interface 85 and an output interface 86 connected to the microcomputer via a bus 84 such as a data bus. Has been.

  Various signals are input to the input interface 85 from the start / stop switch 17, the cloth thickness detecting potentiometer 76 that detects the cloth thickness in conjunction with the work clamp operation of the work clamp 65, the timing signal generator 87, and the like. In addition, an operation instruction signal is supplied from an operation panel 88 (not shown). The timing signal generator 87 is provided so as to be linked to a main shaft (not shown) of the electronic eyelet sewing machine 1, detects a rotational phase of the main shaft, and outputs various phase signals.

  The output interface 86 supplies a drive circuit 90 for the sewing machine motor 89, a drive circuit 92 for the θ-direction drive motor 91 that drives the needle bar turning mechanism, and a hammer drive air cylinder 9 that drives the hammer 8. A drive circuit 94 for an air regulator 93 that adjusts the pressure of the pressurized air, a drive circuit 95 for a presser air cylinder 69, and a drive for an X-direction drive motor 96 that drives and moves the feed base 16. A drive signal is appropriately supplied to the circuit 97 and the drive circuit 99 for the Y-direction drive motor 98, and a display drive signal is supplied to the display and lamp of the operation panel 88.

  Here, when the magnitude of the drive voltage applied to the coil is changed, the air regulator 93 changes the magnitude of the magnetic field generated by the coil, so that the size of the air passage by the main valve can be changed. The pressure air can be adjusted and supplied to the presser air cylinder 69.

  The ROM 86 has a hammer data in addition to a sewing data for a sewing machine for driving a sewing mechanism based on the sewing data for a plurality of types of seam stitches and various types of the sewing data. Various driving control programs for driving the driving air cylinder 9 and the motors 91, 96, 98, a driving force setting table associating the cloth thickness with the hammer driving air pressure and its driving voltage V shown in FIG. A hole sewing control program using a point knife unique to the present application is stored.

  The RAM 83 is provided with various work memories, buffers, and the like in addition to the stitch data memory for storing the read stitch data of the hole stitch.

  Next, a description will be given of hole-sewing control by the point knife executed by the control device 80 of the electronic eye-hole sewing machine 1 based on the flowchart of FIG. However, in the figure, reference sign Si (i = 11, 12, 13,...) Represents each step. In the control of the hole stitching by the point knife, by specifying the point knife, the eyelet hole is formed by driving the hammer 8 prior to the hole stitching.

  Further, in the initial setting immediately after the power is supplied to the electronic eyelet sewing machine 1, the presser foot air cylinder 69 is driven to cause the presser foot 65 to press the presser foot 65 on the feed base 16 on which the work cloth W is not placed. The volume value from the cloth thickness detection potentiometer 76 is read and set as an initial value corresponding to the cloth thickness “zero”.

  When a hole stitch to be used for sewing is selected on the operation panel 88 and the start / stop switch 17 is operated (S11: Yes), this control is started, and first, the presser air cylinder 69 is driven to advance ( S12). As a result, the cloth presser 65 descends and presses the work cloth W on the feed base 16, and the cloth thickness is calculated based on the volume value output from the cloth thickness detecting potentiometer 76 at this time (S13).

  Next, based on the setting data set in the driving force setting table, the driving voltage V for generating the driving force (air pressure) of the hammer 8 corresponding to the cloth thickness is set (S14). Next, the set drive voltage V is applied to the air regulator 93 (S15). At this time, the pressure of the pressurized air supplied to the hammer driving air cylinder 9 is adjusted by the air regulator 93 according to the driving voltage V corresponding to the cloth thickness.

  In this way, since the pressure of the pressurized air is adjusted according to the cloth thickness by S15, the hammer driving air cylinder 9 is driven to retreat with the adjusted pressure of the pressurized air, and the hammer 8 is punched out. Actuated (S16). As a result, when the work cloth W is thick, the hammer 8 presses the knife 5 through the work cloth W with a large pressure corresponding to the cloth thickness to form eyelet holes, while the work cloth W is thin. In this case, the hammer 8 presses the knife 5 through the work cloth W with a small pressure corresponding to the cloth thickness to form the eyelet hole.

  For example, when the work cloth W is thick such as jeans and the cloth thickness is as large as “4 mm”, the driving voltage V7 (see FIG. 10) corresponding to the cloth thickness is applied to the air regulator 93. For this reason, the air regulator 93 is supplied with pressurized air having a large pressure of “0.45 Mpa” to the hammer driving air cylinder 9, and the work cloth W is punched out with a large driving force.

  However, when the work cloth W is a thin object such as slacks and the cloth thickness is as small as “1 mm”, the driving voltage V1 (see FIG. 10) corresponding to the cloth thickness is applied to the air regulator 93. The air regulator 93 is supplied with pressurized air having a small pressure of “0.30 Mpa” to the hammer driving air cylinder 9, and the work cloth W is punched out with a small driving force.

  Next, when a predetermined minute time has elapsed after the hammer drive air cylinder 9 has been retracted and the eyelet forming operation by the hammer 8 is completed (S17: Yes), the hammer drive air cylinder 9 is advanced to drive the hammer. 8 is returned to its raised position (S18). Next, when the hammer 8 returns to the uppermost position after a predetermined minute time has elapsed after the hammer drive air cylinder 9 has been advanced, the feed base 16 is moved to the sewing start position (S20). .

  Then, after the feed base 16 is moved to a predetermined sewing start position, a stitched seam is formed around the eyelet hole by the vertical movement of the sewing needle (S21), and the presser air cylinder 69 is driven in and retracted. The presser foot 65 is raised to the upper open position (S22), and this control is finished.

  Here, the hammer drive mechanism is constituted by the transmission mechanism 10 that transmits the driving force of the direct acting support mechanism 6 and the hammer driving air cylinder 9 to the hammer 8. The feed direction moving mechanism is composed of the X direction drive motor 96 and the X direction drive mechanism, the Y direction Y direction drive motor 98, the Y direction drive mechanism, and the like.

  Further, the cloth thickness detecting potentiometer 86, the hole stitching control S13 by the point knife, the control device 80 and the like correspond to the cloth thickness information acquisition means, and the driving force setting table shown in FIG. 10 and the hole stitching control by the point knife are controlled. S14, the control device 80, and the like correspond to the hammer driving force setting means, and S15 and the control device 80, etc. of the hole stitching control by the tip knife correspond to the control means.

  In this way, the driving force of the hammer 8 is set in advance according to the thickness of the work cloth W to be used for hole stitching, and the work cloth W set in advance according to the cloth thickness when the eyelet hole is formed by the hammer operation. Since the eyelet hole can be formed in the work cloth W with the optimum driving force, the eyelet hole can be surely formed regardless of whether the work cloth W is thin or thick. Moreover, since the destructive pressing force does not act on the knife 5 when forming the eyelet hole of the thin workpiece cloth W, the knife 5 can be reliably prevented from being damaged.

  Further, the cloth thickness detection potentiometer 76 detects the amount of rotation of the connecting shaft 67 of the presser foot drive mechanism 60 that is a presser foot support member that supports the presser foot 65 that presses and holds the work cloth W as the cloth thickness information acquisition means. Thus, the cloth thickness can be accurately detected by the amount of rotation of the connecting shaft 67. Furthermore, since the cloth thickness is detected by the cloth thickness detecting potentiometer 76, the cloth thickness information acquisition means can be reduced in size, weight, and cost.

  Further, in order to set the driving force when the hammer 8 forms the eyelet hole, a driving force setting table (see FIG. 10) in which the cloth thickness of the work cloth W is associated with the hammer driving force is provided. Using the driving force setting table, the hammer driving force with respect to the cloth thickness can be set quickly and easily.

  Further, an air cylinder 9 for driving the hammer 8 and an air regulator 93 for adjusting the pressure of the pressurized air supplied to the air cylinder 9 for driving the hammer 8 are provided, and the pressure of the pressurized air is adjusted via the air regulator 93. Therefore, the pressure adjustment of the pressurized air for obtaining the hammer driving force optimum for the cloth thickness by the operation of the air cylinder 9 for driving the hammer 8 can be easily set electrically by the air regulator 93.

  Further, since the hammer drive mechanism using the direct-acting support mechanism 6 is adopted, the hammer 8 can be raised in parallel to the knife 5 after the eyelet hole is formed. The knife 5 can be more reliably prevented from being damaged or chipped as compared to an electronic eyelet-holed sewing machine that employs the hammer drive mechanism.

  Next, a modified embodiment in which the above embodiment is partially modified will be described.

  1] As for a sensor for detecting the thickness of the work cloth W to be used for hole sewing, a proximity sensor or an optical sensor is used in accordance with the amount of movement or rotation of various members of the presser air cylinder 69 or the presser foot drive mechanism 60. Detection may be performed by various detection sensors such as a rotary encoder.

  2) Before sewing, the thickness of the work cloth W to be used for hole sewing is appropriately set by the operator through the operation panel 88, and the hole thickness is set based on the set cloth thickness information. You may make it perform sewing control. In this case, the control for reading the cloth thickness information set by the operation panel 88 and acquiring the cloth thickness corresponds to the cloth thickness information acquiring means.

  3] The driving time of the hammer 8 may be changed according to the thickness of the work cloth W. In this case, the ROM 82 of the control device 80 stores a driving time setting table in which the cloth thickness and hammer driving shown in FIG. Based on the above, the pressing time of the hammer 8 is appropriately set.

  However, in this case, the pressure of the pressurized air supplied from the air regulator 93 to the hammer driving air cylinder 9 is set so as to be punched even with the work cloth W having the maximum cloth thickness (for example, about 5 mm). Shall.

  That is, after S31 to S33 are executed in the same manner as S11 to S13 described above, the driving time of the hammer 8 is set according to the fabric thickness based on the setting data set in the driving time setting table (S14). . Next, the hammer driving air cylinder 9 is driven to retract by the pressure of the pressurized air supplied from the air regulator 93 (S35), and when the hammer driving time corresponding to the cloth thickness has elapsed (S36: Yes), that is, When the hammer 8 is punched, the hammer 8 is returned to its raised position by the advance drive of the hammer driving air cylinder 9 (S37). Thereafter, S38 to S41 are executed in the same manner as in the above-described embodiment.

  Here, the cloth thickness detection potentiometer 86, hole stitching control S33 by the tip knife, the control device 80 and the like correspond to the cloth thickness information acquisition means, and the driving time setting table shown in FIG. 12 and the hole stitching control by the tip knife are controlled. S34, the control device 80, and the like correspond to the hammer drive time setting means, and S35 to S37 of the hole stitching control by the tip knife and the control device 80, etc. correspond to the control means.

  As described above, since the hammer driving time is set in advance according to the thickness of the work cloth W to be used for the hole stitching, even when the work cloth W is thin, the work cloth W is thick even when the eyelet hole is formed by the hammer operation. Even so, the eyelet hole can be reliably formed. In addition, the pressing time for pressing the knife 5 with the hammer 8 is an optimum time according to the cloth thickness, and since a destructive large pressing force does not act on the knife 5, the knife 5 can be reliably prevented from being damaged. it can.

  4] When performing the overlock stitching control, the control may be performed so that the eyelet hole is formed after the overlock stitching is performed first by specifying the rear knife.

  5] The electronic eyelet hole sewing machine 1 may be provided with a hammer drive mechanism that employs a rotating type that rotates the hammer 8 via a pivot shaft.

  6) The present invention is not limited to the embodiments described above, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. The present invention includes those modifications.

It is a front view which shows the internal structure of the electronic eyelet hole sewing machine which concerns on the Example of this invention. It is a top view which shows the internal structure of an electronic eyelet hole sewing machine. It is a partial enlarged front view of the support structure of a cutter shaft member. It is a fragmentary top view of the support structure of a cutter shaft member. It is a partial side view of the support structure of a cutter shaft member. It is a disassembled perspective view of a holder member and a hammer support body. FIG. 2 is a view corresponding to FIG. 1 when a work cloth is cut. It is a side view of a work clamp and a presser drive mechanism. It is a block diagram of a control system of an electronic eyelet hole sewing machine. It is a chart which shows the setting data of a driving force setting table. It is a flowchart of a hole sewing control by a point knife. It is a chart which shows the setting data of a drive time setting table. FIG. 12 is a diagram corresponding to FIG. 11 according to a modified embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic eyelet hole sewing machine 5 Female 8 Hammer 9 Hammer drive air cylinder 15 Female base 16 Feed base 65 Work clamp 67 Connecting shaft 76 Potentiometer 80 for detecting cloth thickness Control means 82 ROM
96 X-direction drive motor 98 Y-direction drive motor W Work cloth

Claims (6)

In a piggy hole sewing machine equipped with a hammer for punching eyelet holes in a work cloth and a driving actuator for the hammer, a knife base having a knife, a feed base for moving the work cloth and moving mechanism,
Cloth thickness information acquisition means for acquiring cloth thickness information on the cloth thickness of the processed cloth;
Hammer driving force setting means for setting a hammer driving force according to the cloth thickness when the hammer is operated by the driving actuator to form the eyelet hole based on the cloth thickness information received from the cloth thickness information acquiring means; ,
Control means for controlling the hammer driving actuator so as to have the hammer driving force set by the hammer driving force setting means;
An eye-catching sewing machine characterized by comprising   2. The eyelet hole punching according to claim 1, wherein the cloth thickness information acquiring unit is configured to detect, with a potentiometer, a rotation amount of a presser support member that supports a presser foot that presses and holds a work cloth. sewing machine.   The eyelet sewing machine according to claim 1 or 2, wherein the hammer driving force setting means includes a driving force setting table in which cloth thickness information of the work cloth and the hammer driving force are associated with each other.   The drive actuator has an air cylinder and a regulator that adjusts the pressure of pressurized air supplied to the air cylinder, and the control means adjusts the pressure of the pressurized air through the regulator. The eyelet-punching sewing machine according to any one of claims 1 to 3.   The eyelet drilling machine according to any one of claims 1 to 4, further comprising a direct-acting hammer drive mechanism that drives the hammer up and down parallel to the knife. In a piggy hole sewing machine equipped with a hammer for punching eyelet holes in a work cloth and a driving actuator for the hammer, a knife base having a knife, a feed base for moving the work cloth and moving mechanism,
Cloth thickness information acquisition means for acquiring cloth thickness information on the cloth thickness of the processed cloth;
A driving time setting table that associates the cloth thickness information of the work cloth with the hammer driving time, and operates the hammer by the driving actuator based on the cloth thickness information received from the cloth thickness information acquisition means; Hammer driving time setting means for setting the hammer driving time when forming the eyelet hole according to the cloth thickness;
Control means for controlling the hammer driving actuator to be the hammer driving time set by the hammer driving time setting means;
An eye-catching sewing machine characterized by comprising