JP4702609B2 - Perforated sewing machine - Google Patents

Description

The present invention relates to an over-stitch sewing machine, and in particular, supports a bed portion of a yarn waste collection chamber for collecting yarn waste generated during yarn cutting of a yarn trimming device provided in a feed base movably disposed in the bed portion. inside a box-shaped bed stand that, but you as Keru integrally set.

  Conventionally, in an overlock sewing machine that sews eyelet stitches, when the eyelet stitching is started, the upper shaft is driven to rotate by the drive of the sewing machine motor, and the needle bar moves up and down by the rotation of the upper shaft. The needle bar is moved up and down by driving the mechanism, the looper is driven, the needle bar is swung by the needle swinging mechanism, and the balance is swung by the balance mechanism. When the eyelet seam is formed, the thread trimming device provided in the bed portion is driven to cut the lower thread and the core thread.

  For example, a thread trimming device for an eyelet sewing machine described in Patent Document 1 includes a box-shaped bed base, a bed part pivotally supported by the box bed, and a pedestal part rising from the bed part, An arm portion extending forward from the upper end portion of the pedestal portion is provided. A needle bar is provided at the front end portion of the arm portion so as to be movable up and down and swingable, and a looper base having two loopers is provided at a portion of the bed portion facing the needle bar.

  Further, the bed portion is provided with a looper thread cutting mechanism having a looper thread cutter and a thread trimming air cylinder for slicing and operating the thread trimming stitch. The looper thread cutting mechanism is activated, and the lower thread end extending from the sewing start position of the eyelet stitching and the lower thread extending from the sewing end position are simultaneously cut in the vicinity of the sewing end position. .

JP 2001-321589 A (pages 4-6, FIGS. 1 and 4)

  As described above, in the thread trimming device for the eyelet sewing machine described in Patent Document 1, the looper thread cutting mechanism is provided inside the feed base, and the looper thread cutting mechanism is operated at the end of the stitching of the eyelet stitching. Thus, the lower thread end portion at the start of the eyelet stitching is cut at the same time, so that the lower thread end portion at the start of the sewing becomes thread waste. The lint moves with the rotation of the looper base located in the vicinity, and eventually falls from the end of the frame of the bed portion toward the bottom of the bed table.

  As a result, the yarn waste adheres to every part of various drive mechanisms such as a looper drive mechanism and a feed base drive mechanism provided below the bed while falling. In particular, when a large amount of lint adheres to the rotating part or sliding part of the drive mechanism, the feed accuracy of the feed base deteriorates or the lubricating oil cannot be sufficiently supplied, and the drive part generates heat. There is a problem of causing failure and wear.

The over-stitch sewing machine according to claim 1 has a bed portion disposed on a box-shaped bed base, and a feed base of a feeding device that feeds the workpiece to the bed portion is movably provided. In an over-stitch sewing machine equipped with a device, an upwardly open thread waste collection chamber that collects thread waste cut by the thread trimming device is integrally formed at the end of the bed table close to the thread trimming device. The waste thread collecting chamber is composed of a central wall portion of the bed base, a rear wall extending vertically upward from a lower end portion of the bed base, and both left and right wall portions in contact with the left and right ends of the rear wall and the central wall portion, is integrally formed in a rectangular shape in plan view and side view a triangular shape, the central wall portion is a side wall of the bed base, the side walls are formed in an inclined shape to shift inward of the bed base enough to go downward, the looper Move the lint to the lint collection chamber on the looper base It is provided with a lint collection member.

  At the end of sewing the eyelet stitches, if thread waste is generated by cutting the thread with the thread trimming device, the thread waste is collected in the thread waste recovery chamber. It will not fall to the bottom of the bed bed on the side. Therefore, the yarn waste does not adhere to the drive part or the sliding part of the drive mechanism, and the drive mechanism operates normally without being disturbed by the yarn waste.

According to a second aspect of the present invention, the perforated sewing machine according to the first aspect is provided with a suction mechanism for sucking out the yarn waste accommodated in the yarn waste collecting chamber.

According to a third aspect of the present invention, there is provided a thread-sewn sewing machine according to the first or second aspect , wherein the thread is cut by a thread trimming device between an end of the bed portion near the thread trimming device and the yarn waste collecting chamber. A transfer plate member for dropping the waste into the yarn waste collecting chamber so as to be recovered is provided.

  According to invention of Claim 1, a bed part is arrange | positioned at the box-shaped bed stand, The feed stand of the feed apparatus which sends a to-be-sewn material to the bed part is provided so that a movement is possible, The thread trimming device is provided in the feed stand Since a thread waste collecting chamber is provided on the bed table to collect the thread waste that has been cut by the thread trimming device, the thread waste falls from the bed to the bottom of the lower bed base. Since the yarn waste does not adhere to the drive portion or the sliding portion of the drive mechanism, the drive mechanism is not disturbed by the yarn waste. Therefore, the durability of the drive mechanism is remarkably improved, the drive mechanism can be operated normally, and the reliability can be improved.

  Since the yarn waste collection chamber is integrally formed at the end of the bed table close to the thread trimming device, it can be formed integrally with the bed table without providing a separate yarn waste collection chamber. Work can be simplified.

A looper base with Le supermarkets, is provided with the yarn waste collecting member for moving the yarn waste towards the lint collection chamber, each sew eyelet buttonhole stitches, looper base is a predetermined angle counterclockwise and clockwise The yarn waste that has fallen between the looper base and the frame of the bed portion can be moved toward the yarn waste collection chamber by the yarn waste collecting member as it rotates alternately around. Therefore, the yarn waste can be effectively and quickly collected in the yarn waste collection chamber .

According to the invention of claim 2 , since the suction mechanism for sucking out the yarn waste accommodated in the yarn waste recovery chamber is provided, the operator does not take out the yarn waste accommodated in the yarn waste recovery chamber, and the suction mechanism It will be sucked out and the lint can be collected automatically. Other effects similar to those of the first aspect are obtained.

According to the invention of claim 3 , the yarn waste cut by the yarn trimming device is collected in the yarn waste collecting chamber between the end portion of the bed portion close to the yarn trimming device and the yarn waste collecting chamber. Since the transfer plate member to be dropped is provided, the yarn waste generated by the yarn cutting can be surely dropped and stored in the yarn waste collection chamber by the transfer plate member without falling to the bed table. Other effects similar to those of the first or second aspect are achieved.

  In the case of the sewing machine of this embodiment, the thread waste collecting chamber is integrally formed at the front end of the bed base, and when the thread end cut by the thread trimmer becomes thread waste, the thread waste is removed from the looper base. With the return rotation to the sewing start position, the yarn is moved toward the yarn waste collecting chamber and collected in the yarn waste collecting chamber.

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

  A needle bar 7 having a sewing needle 6 is provided at the lower end 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 rotated by the driving of the sewing machine motor is not shown. The needle bar 7 swings left and right by a predetermined width while moving up and down. 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.

  Further, a looper base provided with two loopers (not shown) on the horizontal support frame portion Fa of the frame F of the bed portion 3 (hereinafter simply referred to as the bed frame F) so as to face the needle bar 7. 10 is rotatably provided, and these two loopers are driven in synchronism with the vertical movement of the needle bar 7 by rotation of the main shaft via a cam mechanism (not shown).

  As shown in FIG. 1, a driven pulley 9 is fixedly attached to a driving shaft portion 10 a that extends downward integrally from the looper base 10, and a θ-direction driving motor 27 is fixed to a bed frame F behind the driven pulley 9. . Further, a timing belt 29 is stretched over the drive pulley 28 and the driven pulley 9 fixed to the drive shaft of the θ-direction drive motor 27.

  Therefore, when the θ-direction drive motor 27 is driven, the looper base 10 is indicated by a two-dot chain line from the standby position indicated by the solid line in FIG. 5 on the horizontal plane via the pair of pulleys 9 and 28 and the timing belt 29. It rotates integrally around the vertical axis over about 180 ° to the diagonal position. At this time, the needle bar 7 is also driven to rotate about 180 ° at the same time.

  In the bed frame F, a female receiving frame portion Fc that is one step higher is formed by the vertical wall portion Fb immediately behind the support frame portion Fa, and the female receiving frame portion Fc has a female ( A knife base 11 (not shown) is attached, and a punching hammer body (not shown) that is brought into contact with and separated from the knife from above is swingably provided.

  A hammer (not shown) for eyelet holes is detachably attached to the tip of the hammer body, and is driven by a hammer drive mechanism (not shown) made up of an air cylinder or the like provided in the bed 3. A hole is drilled in the work cloth.

  A feed base 8 on which a work cloth is set is provided on the upper surface of the bed 3 so as to be horizontally movable. The feed base 8 has a thin rectangular box shape as a whole, and an X-direction moving mechanism (not shown) for moving the feed base 8 in the X direction (left and right direction) by driving an X direction feed motor. And a Y-direction moving mechanism (not shown) that moves the Y-direction feed motor in the Y direction (front-rear direction) by driving the Y-direction feed motor. Here, the feed base 8, the X-direction moving mechanism, and the Y-direction moving mechanism constitute a feeding device that feeds the workpiece.

  Next, the thread trimming device 15 provided inside the feed base 8 for cutting the lower thread and the core thread will be briefly described.

  As shown in FIG. 4, a pair of left and right cross plates 13, 14 are provided on the upper surface of the central portion in the left-right direction of the feed base 8, and the upper blade member 16 and the lower blade member 17 are formed on the upper surface of the right cross plate 13. A step screw 18 is pivotally supported. A thread trimming air cylinder 19 is disposed in the left-right direction at a front end portion inside the feed base 8, and a connecting member 20 having a substantially U shape in plan view is fixed to a tip portion of the piston rod 19a.

  When the thread trimming air cylinder 19 is driven at the end of sewing of the eyelet seam HN (see FIG. 4), the piston rod 19a advances to the right by a predetermined stroke S, and the first operation is performed via the connecting member 20. Since the link 21 rotates counterclockwise, the first connection link 22, the drive link 23, the second operation link 24, the second connection link 25, and the third connection. The upper blade member 16 is rotated clockwise through the link 26, the lower blade member 17 is rotated counterclockwise, and the lower thread and the core thread are cooperated by the upper blade member 16 and the lower blade member 17. And are disconnected.

  Next, the yarn waste collecting chamber 30 formed at the front end of the bed table 2 (which corresponds to the end of the bed table close to the thread trimming device) will be described.

  As shown in FIGS. 1, 2, 5, and 6, the lint collection chamber 30 is a part of the center in the width direction of the front end wall of the bed 2, and is about half the width of the bed 2. A central wall portion 2a having a width corresponding to the rear wall 31, a rear wall 31 extending vertically upward from the lower end of the bed base 2, and left and right wall portions 32, 33 in contact with the left and right ends of the rear wall 31 and the central wall portion, Are formed integrally. Therefore, the yarn waste collecting chamber 30 is substantially rectangular in plan view and substantially triangular in side view, and the upper side is open.

  As shown in FIGS. 1 and 2, a base end portion of a transfer plate member 35 having a width dimension narrower than that of the yarn waste collecting chamber 30 is fixed to the front end of the bed frame F. That is, the transfer plate member 35 is inclined forward, and its front end extends to the front rather than the rear wall 31 of the yarn waste collecting chamber 30. Therefore, the yarn waste moved forward from the bed frame F is accommodated in the yarn waste collection chamber 30 so as to slide down the inclined transfer plate member 35.

  Next, the yarn waste collecting member 37 that moves the yarn waste that has fallen onto the gap frame portion Fd on the rear side of the looper base 10 toward the yarn waste collection chamber 30 will be described.

  As shown in FIGS. 2 and 5, at one end of the looper base 10, the base end portion of the yarn waste collecting member 37, which is substantially crank-shaped in a side view and made of a thin plate member, is connected to the standby position shown in FIG. 5. It is fixed to become. The front end portion of the yarn waste collecting member 37 extends downward, and is disposed so as to contact the narrow gap frame portion Fd between the looper base 10 and the vertical wall portion Fb in the support frame portion Fa.

  That is, at the end of the sewing of the eyelet stitching seam HN, the thread trimming device 15 simultaneously cuts the lower thread at the sewing end of the eyelet stitching stitch HN and the lower thread end of the sewing at the same time. The yarn ends of the lower thread and the core thread fall on the gap frame portion Fd as yarn waste. The yarn waste collecting member 37 is located at a standby position indicated by a solid line in FIG. 5 except when sewing, but when sewing is started, the yarn waste collecting member 37 is moved from the standby position by the rotation of the looper base 10. It rotates counterclockwise by about 180 ° to the diagonal position indicated by the dotted line.

  However, after the thread cutting device 15 cuts the yarn, the lint collecting member 37 fell on the gap frame portion Fd as the looper base 10 returned to the original sewing start position shown in FIG. The yarn waste is rotated to the original standby position while moving the yarn waste toward the yarn waste collection chamber 30. In this way, when the yarn waste moves from the front end of the bed frame F to the inclined transfer plate member 35, the yarn waste is automatically collected in the yarn waste collection chamber 30 by sliding the transfer plate member 35.

Next, the suction mechanism 40 that sucks out the yarn waste accommodated in the yarn waste collection chamber 30 with compressed air will be described.
As shown in FIG. 1, a front end portion of a vinyl suction hose 41 is connected to one portion of the lower end portion of the yarn waste collecting chamber 30. The suction hose 41 extends rearward on the bottom wall of the bed table 2 and extends from the rear end to the outside.

  The suction mechanism 40 includes an ejector 42 having a suction port 42a, an air inlet 42b, and an air outlet 42c, an air source for supplying compressed air to the ejector 42, etc., and only the air passage on the air inlet 42b side is narrowed. Yes. The rear end of the suction hose 41 is connected to the suction port 42a of the ejector 42, the air hose 43 from the air source is connected to the air inlet 42b of the ejector 42, and the garbage bag 44 is attached to the air outlet 42c. .

  When the compressed air PA from the air source is supplied to the air inlet 42b, the air flow passes through a narrow air passage, and therefore, the speed becomes high inside the ejector 42 according to Bernoulli's law, thereby causing a negative pressure state (low pressure) Therefore, the yarn waste stored in the yarn waste collection chamber 30 is sucked out through the suction hose 41 and stored in the garbage bag.

Next, the operation and effect of the perforated sewing machine 1 configured as described above will be described.
When the eyelet seam HN is not sewn, since the looper base 10 is located at the sewing start position, the lint collecting member 37 is located at the standby position indicated by the solid line in FIG. When the sewing of the eyelet stitch seam HN is started, the looper base 10 rotates counterclockwise by about 180 ° to the rotation position, so that the yarn waste collecting member 37 is similarly shown by a two-dot chain line in FIG. It rotates about 180 ° to the diagonal position shown.

  After the sewing of the eyelet seam HN, the thread trimming device 15 simultaneously cuts the lower thread at the end of the eyelet seam HN and the core thread and the lower thread end of the seam at the start of sewing as described above. The Therefore, the lower thread at the start of sewing and the thread end of the core thread fall as lint on the gap frame part Fd. Thereafter, as the looper base 10 rotates back to the original sewing start position, the yarn waste collecting member 37 moves the yarn waste falling on the gap frame portion Fd toward the yarn waste collecting chamber 30 while moving the yarn waste toward the yarn waste collecting chamber 30. To the standby position.

  As described above, when the yarn waste moves from the front end of the bed frame F to the inclined transfer plate member 35, the yarn waste is automatically collected in the yarn waste collecting chamber 30 by sliding the inclined transfer plate member 35. When the amount of yarn waste stored in the yarn waste collection chamber 30 increases, the operator supplies compressed air PA from an air source to the air inlet 42b. Therefore, as described above, the yarn waste stored in the yarn waste collection chamber 30 is sucked out through the suction hose 41 by the suction action of the ejector 42 and stored in the garbage bag 44.

  As described above, since the bed table 2 of the bobbin stitching machine 1 having the thread trimming device 15 is provided with the thread waste collecting chamber 30 for collecting the thread waste cut by the thread trimming device 15, the thread waste is stored in the bed portion. Since the yarn waste does not fall to the bottom of the bed base 2 below 3 and the yarn waste does not adhere to the driving portion or the sliding portion of the rotating mechanism or other drive mechanism, the drive mechanism is obstructed by the yarn waste. There is nothing to do. Therefore, the durability of the drive mechanism is remarkably improved, the drive mechanism can be operated normally, and the reliability can be improved.

  The yarn waste collecting chamber 30 is integrally formed at the end of the bed table 2 near the yarn trimmer 15, that is, the front end portion. The yarn waste is collected in the looper base 10 having a looper. Since the thread waste collecting member 37 is moved in the direction, the looper base 10 is rotated counterclockwise by a predetermined angle each time the eyelet stitch seam HN is sewn, and then clockwise by a predetermined angle after thread trimming. When the rotation returns, the yarn waste collecting member 37 moves the yarn waste that has fallen to the gap frame portion Fd between the looper base 10 and the vertical wall portion Fb toward the yarn waste collecting chamber 30 by the yarn waste collecting member 37. Let Therefore, the yarn waste can be collected in the yarn waste collection chamber 30 effectively and quickly.

  Further, since the sucking mechanism 40 for sucking out the yarn waste accommodated in the yarn waste collecting chamber 30 is provided, the dust bag accommodated by the sucking mechanism 40 is taken out without the operator taking out the yarn waste accommodated in the yarn waste collecting chamber 30. Accordingly, the yarn waste can be automatically collected.

  Further, since the transfer plate member 35 that is inclined forward and reaches the yarn waste collecting chamber 30 is fixed to the front end of the bed portion 3 on the side close to the yarn trimming device 15, the yarn waste generated by the yarn cutting is removed. The yarn waste collecting member 37 is moved toward the yarn waste collecting chamber 30 and can be surely dropped into the yarn waste collecting chamber by the transfer plate member 35 without falling on the bed table.

Next, a modified embodiment in which the embodiment is partially modified will be described.
1] The above-described yarn waste collecting chamber 30 may be configured separately from the bed table 2 and pivotally attached to the lower end portion thereof by a horizontal shaft so as to be able to tilt forward. That is, when the amount of yarn waste stored in the yarn waste collection chamber 30 increases, the operator falls the yarn waste collection chamber 30 to the front side (front side) and throws away the yarn waste accommodated inside the waste bin. Also good.

2] The lint collection chamber 30A is separate from the bed table 2 and may be detachable from the bed table 2. That is, as shown in FIG. 8, the yarn waste collecting chamber 30A is formed as a box made of synthetic resin and having a predetermined width and having a substantially inverted triangular cross section. Therefore, a mounting chamber 2b for fitting the yarn waste collection chamber 30A, which is the box body, is integrally formed at the same position as the yarn waste collection chamber 30 provided in the embodiment, that is, at the front end portion of the bed base 2. ing.

  In the yarn waste collecting chamber 30A, as described in the above embodiment, the yarn waste is automatically accommodated when the yarn waste collecting member 37 returns from the diagonal position to the standby position. Therefore, when the amount of yarn waste stored in the yarn waste collection chamber 30A increases, as shown in FIG. 8, the operator raises the bed portion 3 to an inclined posture and then picks up the yarn waste collection chamber 30A by hand. , Throw away the stored lint into the trash. Thereafter, the operator attaches the lint collection chamber 30A to the original mounting chamber 2b.

  Also in this case, as in the above-described embodiment, the yarn waste that has fallen to the gap frame portion Fd between the looper base 10 and the vertical wall portion Fb is moved toward the yarn waste collection chamber 30A by the yarn waste collecting member 37. The yarn is collected in the yarn waste collecting chamber 30A. When a large amount of yarn waste accumulates in the yarn waste collection chamber 30A, the operator can remove the yarn waste collection chamber 30A and easily dispose of the yarn waste accommodated in the waste bin.

3] A plurality of lint collecting members 37 can be attached to the looper base 10. Further, the yarn waste collecting member 37 provided on the looper base 10 may be omitted.

4] A transfer plate member 35 having a size that does not collide with the bed portion 3 that swings up and down may be integrally formed in the yarn waste collecting chambers 30 and 30A. Also in this case, the yarn waste generated by the yarn cutting can be surely dropped and stored in the yarn waste collection chambers 30 and 30A by the transfer plate member 35 without falling on the bed table 3.

5] The present invention is not limited to the above-described embodiment, 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 such modifications.

1 is a side view of an eyelet-holed sewing machine according to an embodiment of the present invention including a partial longitudinal section. 1 is a perspective view of an eyelet-punching sewing machine according to an embodiment of the present invention. It is a front view of an eyelet-punching sewing machine. It is a top view of a thread trimming device. It is a principal part longitudinal section top view of a bed part. It is a perspective view of a bed stand. It is a principal part enlarged side view of FIG. FIG. 2 is a diagram corresponding to FIG. 1 according to a modified embodiment.

DESCRIPTION OF SYMBOLS 1 Hole sewing machine 2 Bed stand 3 Bed part 8 Feed stand 10 Looper base 15 Thread trimmer 30 Yarn waste collection chamber 35 Yield board member 37 Yarn waste collection member 40 Suction mechanism 42 Ejector

Claims (3)

In a perforated sewing machine in which a bed portion is arranged on a box-shaped bed base, and a feed base of a feed device that feeds a workpiece to the bed portion is movably provided, and a thread trimming device is provided on the feed base. ,
An upper open yarn waste collecting chamber for collecting the yarn waste cut by the yarn trimming device is integrally formed at the end of the bed table near the yarn trimming device,
The lint collecting chamber is a flat surface formed by a central wall portion of the bed base, a rear wall extending vertically upward from a lower end portion of the bed base, and left and right wall portions in contact with the left and right ends of the rear wall and the central wall portion. It is integrally formed in a rectangular shape and a triangular shape in side view,
The central wall portion is a side wall of the bed table, and the side wall is formed in an inclined shape so as to move downward toward the inside of the bed table ,
A looper base having a looper is provided with a yarn waste collecting member for moving the yarn waste toward the yarn waste collection chamber.
A hole sewing machine characterized by that. The perforated sewing machine according to claim 1, further comprising a suction mechanism for sucking out the yarn waste accommodated in the yarn waste collecting chamber . A transfer plate member for dropping the yarn waste cut by the yarn trimming device into the yarn dust collecting chamber between the end portion of the bed portion close to the yarn trimming device and the yarn waste collecting chamber. The hole sewing machine according to claim 1 or 2, wherein

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