JP2014128501A - Thread perforation device for sheet material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thread perforation device and method for a sheet material which can allow a thread to pass through the sheet material and can prevent the thread from forming a loop under the sheet material.SOLUTION: A thread perforation device 10 for a sheet material includes: a thread-holding mechanism 12; a thread-passing needle 13; a coming-out prevention mechanism 14; and a cutting mechanism 15. The thread-holding mechanism 12 can keep the length of a thread 9 delivered from a tip 13a of the thread-passing needle 13 at a fixed length or less, so that the thread can be prevented from having such a length as to form a loop under a sheet material 7. Because the loop is not formed under the sheet material 7, it is possible to avoid such an event that the loop is caught and the thread 9 comes out during the conveyance of the sheet material 7.

Description

  TECHNICAL FIELD The present invention relates to a sheet material threading device for leaving a thread for threading or the like through a sheet material or the like cut into parts in a cutting process. In the following description, regarding a portion related to yarn supply, a supply destination is described as a distal end portion or a distal end side, and a supply source is described as a proximal end portion or a proximal end side.

  Conventionally, in the cutting process, sheet materials such as cloth are cut one by one or in a state where a plurality of sheets are laminated as parts for sewing clothing. For parts, for example, a perforation position is set for positioning at the time of sewing in a subsequent process of the cutting process, and notch cutting or perforation with a perforation drill may be performed. There has also been proposed a marking device that colors a perforated position in a cutting process (see, for example, Patent Document 1). In this marking apparatus, a thread to which a dye is attached in advance is prepared, a needle is pierced and inserted, and the sheet material can be colored with the dye by the thread. A sewing mark applicator is also proposed in which a thread is passed through a sheet material and marking is performed using the thread itself as a mark, or a manual coloring mark using a chaco or the like is used (for example, Patent Document 2). reference).

Japanese Patent Publication No. 56-020388 Japanese Utility Model Publication No. 61-184484

  The reason why the marking device as shown in Patent Document 1 is used is that if it is colored with a dye, it becomes a clear mark during sewing and can be easily removed from each leaf of the laminated sheet material by washing after sewing. Presumed to be. However, in the case where it takes a long time from the cutting with the cutting machine to the step of using the marking, the dye may fall from the colored portion and the marking may become unclear. Further, in the fifth column of page 5 of Patent Document 1, the left column (ninth column), the third to fourth rows, “The darkness of the mark can be increased by reciprocating the needle several times at the same point. . " This is presumed to suggest that there is a possibility that coloring with a dye-colored yarn may be insufficient depending on conditions.

  Even in a cutting machine, as shown in Patent Document 2, if a thread to be a mark is left, marking can be performed with chaco based on the mark thread in accordance with various requirements in the sewing process as a post process. Can do. However, when the yarn is left, there is a risk that the yarn may fall off the sheet material due to the downward suction during cutting by the cutting machine. The cutting table may have a transport function as a conveyor belt. In the case of having such a transport function, as shown in FIG. 2 of Patent Document 2, when a thread loop is formed below the sheet material, a comb-like shape provided on the exit side of the conveyor belt is formed. There is a risk that the thread may fall out of the comb.

  An object of the present invention is to provide a sheet material threading device capable of passing a thread through a sheet material and preventing a loop from being generated below the sheet material.

The present invention is a sheet material threading device that leaves a thread penetrating at a preset position in a sheet material,
A thread supply mechanism capable of supplying a thread;
It is possible to move from the upper part of the sheet material to the perforation position. A thread penetrating needle that feeds the supplied thread from the tip and penetrates the perforated position of the sheet material;
A cutting mechanism for cutting a thread between the tip of the thread penetrating needle punctured at the perforated position of the sheet material and the perforated position;
Provided in the path for supplying the thread from the thread supply mechanism to the thread penetrating needle,
When piercing the thread penetrating needle into the sheet material, the supply of the thread is limited so that the length of the thread cut by the cutting mechanism is kept below a certain length,
Including a thread holding mechanism for releasing the restriction on the supply of the thread when the thread penetrating needle is pulled out of the sheet material,
This is a sheet material threading device.

In the present invention,
The yarn holding mechanism is
Attached at a position facing the proximal end of the thread penetrating needle, moved with the thread penetrating needle in the puncturing, keeping the distance from the proximal end constant,
When piercing a thread penetrating needle into the sheet material, hold the thread,
Release the thread when pulling out the thread penetrating needle from the sheet material,
It is characterized by that.

Moreover, this invention is an outer cylinder extended in the direction of the said stab and draw,
A distal end portion to which a proximal end portion of the thread penetrating needle is coupled;
A base end receiving the driving of the stab and pull, and an outer cylinder having a hollow portion between the tip end and the base end;
A hollow inner cylinder extending in the direction of puncture,
Inside the hollow portion of the outer cylinder, there is a distal end side inserted from the proximal end side of the outer cylinder, and a proximal end side to which the yarn is supplied from the yarn supply mechanism,
An inner cylinder through which the yarn passes through the hollow portion on the distal end side from the proximal end side;
Including an inner cylinder inserted between the inner periphery of the hollow portion of the outer cylinder and the outer periphery of the inner cylinder,
The yarn holding mechanism is housed in the distal end portion of the outer cylinder,
The middle cylinder is characterized in that the tip of the middle cylinder faces the yarn holding mechanism, and the driving force for holding and releasing the yarn by the yarn holding mechanism is received at the base end and transmitted to the tip.

Further, the present invention further includes an end holding mechanism that holds an end portion of the yarn penetrating needle on the tip portion side among the ends of the yarn cut by the cutting mechanism.
It is characterized by that.

Further, according to the present invention, before the cutting mechanism cuts, a slip prevention portion is formed for the yarn between the tip portion and the perforated position of the thread penetrating needle stabbed into the perforated position of the sheet material. Further including a slip-off prevention mechanism,
It is characterized by that.

Further, the present invention is provided between the slip prevention mechanism and the sheet material, and prevents the yarn from being supplied from the perforated position side when the slip prevention mechanism forms the slip prevention part. Further including a thread presser mechanism
It is characterized by that.

In the present invention, the thread presser mechanism is provided on both sides of the thread path between the slip-off preventing mechanism and the sheet material, and the both sides of the thread presser mechanism are not changed when pressing the thread. Sandwiched between
It is characterized by that.

Further, in the present invention, the thread penetrating needle is tubular with the direction of puncturing as an axis, and the base end receives the supply of the thread from the thread supply mechanism,
The tip is
A positively inclined surface having a shape cut at an acute angle with respect to the axis;
The back side of the positively inclined surface has a back inclined surface with a shape cut at an acute angle with respect to the axis from both sides so as to be tapered.
It is characterized by that.

  According to the present invention, the thread supplied from the thread supply mechanism can be penetrated by piercing and pulling the tip of the thread penetrating needle at the perforated position of the sheet material. The length of the thread supplied from the thread supply mechanism to the thread penetrating needle and fed from the tip of the thread penetrating needle is maintained at a certain length or less when the thread penetrating needle is pierced into the sheet material. The thread holding mechanism limits the supply. If the length of the yarn fed out from the leading end is long, even if the leading end of the thread penetrating needle pierces the sheet material, the end of the yarn stays above the sheet material, and the leading end protrudes below the sheet material. There is a possibility that the yarn may form a loop between the end portion that remains above the sheet material. By holding the length of the thread fed from the tip of the thread penetrating needle below a certain level, the thread can be prevented from forming a loop below the sheet material. If a loop is not formed below the sheet material, it is possible to prevent a situation in which the yarn comes off due to the loop being caught.

  According to the present invention, when the thread penetrating needle is punctured into the sheet material, the thread holding mechanism moves together with the thread penetrating needle and keeps the distance from the base end portion constant. Therefore, when the tip of the thread penetrating needle is pierced into the sheet material, the thread holding mechanism can hold the thread so as to be relatively stationary with respect to the thread penetrating needle. Since the length of the yarn coming out of the sheet can be kept constant, a loop can be prevented from being formed below the sheet material. When the tip of the thread penetrating needle is pulled out from the sheet material, the thread holding mechanism releases the thread, so that even if the thread penetrating needle is pulled out from the sheet material, the thread remains in the state penetrating the sheet material. be able to. Furthermore, since the thread holding mechanism is attached at a position facing the proximal end of the thread penetrating needle, the distance to the tip of the thread penetrating needle for feeding the thread is shortened, and the influence of slack and elongation of the thread can be reduced. it can.

  According to the invention, the thread holding mechanism has a triple cylinder structure of the outer cylinder, the middle cylinder, and the inner cylinder, and has a driving force for holding the thread at a position facing the proximal end portion of the thread penetrating needle. It can be transmitted via a cylinder. Since the driving source of the yarn holding mechanism can be separated from the yarn holding mechanism by the transmission through the middle cylinder, the yarn holding mechanism can be brought close to the proximal end portion of the yarn penetrating needle.

  According to the invention, the yarn is held by the yarn holding mechanism in the path for supplying the yarn from the yarn supply mechanism to the yarn penetrating needle, and the end portion of the yarn fed from the tip of the yarn penetrating needle is held by the end holding mechanism. Hold on. The yarn holding mechanism and the end holding mechanism can adjust the timing of holding and releasing the respective yarns, and can adjust the length of the yarn passed through the sheet material by the yarn penetrating needle.

  Further, according to the present invention, after the leading end portion of the thread penetrating needle is pierced and penetrated at the perforated position of the sheet material, a slip prevention mechanism is formed on the yarn remaining on the surface of the sheet material from the perforated position. Therefore, it is possible to prevent omission.

  Further, according to the present invention, the thread presser mechanism can be operated when forming the slip-off preventing part so that the thread penetrated to the perforated position of the sheet material can be prevented from being pulled upward.

  Further, according to the present invention, when the thread presser mechanism is pressed so as to prevent the thread from being supplied from the perforated position side of the sheet material, the thread path is prevented from changing by sandwiching the thread from both sides. It is possible to stably perform the operation of forming the drop prevention portion after pressing the yarn.

  Further, according to the present invention, the thread penetrating needle is tubular, and the thread is inserted from the proximal end portion to the distal end portion. Therefore, when the thread penetrating needle is pierced into the sheet material, the thread accommodated in the tubular portion is the sheet. The material can be kept out of contact. If the sheet material is sucked and held, the suction force also acts on the hollow tubular portion, and it is possible to make it difficult for the yarn to stick up when the thread penetrating needle pierces the sheet material and then is pulled out. Since the tip of the thread penetrating needle has a positively inclined surface with a shape cut at an acute angle with respect to the axis, and a back inclined surface with a shape cut at an acute angle with respect to the axis from both sides on the back side of the positively inclined surface, The most distal end can be inserted inward in the radial direction from the outer periphery of the shaft portion. Since the tip of the tip is inside the outer periphery, the thread penetration needle improves the piercing performance when piercing the sheet material, improves the straightness after piercing, and makes the sheet material difficult to damage. Can do.

FIG. 1 is a side sectional view showing a schematic configuration of a cutting machine 1 including a sheet material threading device 10 according to an embodiment of the present invention. 2 is a front view, a side view, and a perspective view showing the shape of the tip 13a of the thread penetration needle 13 of FIG. FIGS. 3A and 3B are a plan sectional view and a side sectional view showing an operation in one step when the removal preventing portion 14a is formed by the removal preventing mechanism 14 of the sheet stitching device 10 of FIG. FIG. 4 is a cross-sectional plan view and a side cross-sectional view showing the operation in the step following FIG. 3 when the drop prevention mechanism 14a is formed by the drop prevention mechanism 14 of the sheet material threading device 10 of FIG. FIG. 5 is a plan sectional view and a side sectional view showing an operation in a step following FIG. 4 when the slip prevention device 14 of the yarn punching device 10 of FIG. 1 forms the slip prevention portion 14a. 6A and 6B are a plan sectional view and a side sectional view showing an operation in a process subsequent to FIG. 5 when the slip prevention unit 14a is formed by the slip prevention mechanism 14 of the yarn punching device 10 of FIG. FIG. 7 is a side cross-sectional view showing the operation of holding the yarn by the yarn holding mechanism 12 of the sheet material threading device 10 of FIG. FIG. 8 is a partial plan view showing the operation of the thread presser mechanism 19 of the sheet stitching device 10 of FIG. FIG. 9 is a diagram schematically showing the configuration of the mark yarn 9a formed through the steps of FIGS. FIG. 10 is a diagram showing a form that can be formed as a mark yarn 9a.

  1 to 10 show the configuration and operation of a sheet material threading device 10 provided in the cutting machine 1 as an embodiment of the present invention. In order to simplify the explanation, in the plan sectional view and the side sectional view shown in parallel in FIGS. 3 to 7, the corresponding configuration is shown only on one side and may be omitted on the other side. In addition, portions that are not described in the drawings to be described may be referred to with reference numerals described in other drawings.

  In this embodiment, the sheet material 7 in a stacked state is placed on the cutting table 2 of the cutting machine 1, and the sheet material threading device 10 moves above the sheet material 7 along the surface of the cutting table 2. Thus, the thread 9 is passed through the sheet material and left. Although the sheet material threading device 10 moves in the XY two-dimensional direction together with the cutting head 3 of the cutting machine 1, it may be moved independently of the cutting head 3. If the sheet head threading device 10 can be moved independently of the cutting head 3, the sheet material threading device 10 is provided, for example, on the carry-in path of the sheet material 7 to the cutting table 2, or on the spreading table where the sheet material 7 is expanded and stacked. You can also. If the sheet material threading device 10 is combined with the conveyance of the sheet material 7, the sheet material threading device 10 can also perform a two-dimensional movement with respect to the surface of the sheet material 7 by a one-dimensional movement in a direction perpendicular to the conveyance direction.

  Although the main part of the sheet material threading device 10 is accommodated in the housing 16, a part or the whole of the material may be exposed to the outside. The sheet material 7 presupposes that the outer periphery is cut and separated into parts in a state where a plurality of sheets are laminated, but the present invention can be similarly applied even when only one sheet is cut. . Further, the present invention can be applied not only to cutting into parts but also to trimming in which a band is cut with a certain width.

  FIG. 1 shows a schematic configuration of a sheet material threading device 10 provided in a cutting machine 1 as an embodiment of the present invention. The cutting machine 1 includes a cutting table 2 and a cutting head 3. The cutting head 3 is movable along a Y beam 4 laid on the cutting table 2 in a direction perpendicular to the paper surface. The Y beam 4 is supported by a moving mechanism (not shown) on both sides of the front side and the back side of the paper surface and can move in the X direction, which is the left-right direction of the paper surface. The cutting head 3 includes a cutting blade 5 and a material presser 6. The sheet material 7 is sucked and held from below on the cutting table 2 in a stacked state of a plurality of sheets. The cutting head 3 moves in the XY direction along the surface of the cutting table 2. The cutting machine 1 performs an operation of a cutting process including cutting a sheet material 7 whose surface is pressed by a material presser 6 with a cutting blade 5 provided on the cutting head 3 according to preset cutting data.

  In order to suck and hold the sheet material 7 from below the cutting table 2, a sealing sheet 8 made of a non-breathable synthetic resin film is placed over the sheet material 7, and the sheet material 7 is cut from above the sealing sheet 8. The blade 5 is pierced and cut. The surface 2a of the cutting table 2 is formed of bristles at the end of the bristle block 2b, with the synthetic resin bristle blocks 2b arranged so that the cutting blade 5 is not easily cut even if it enters. The cutting table 2 in which the bristle blocks 2b are arranged has a conveying function as a conveyor belt. Since the bristle block 2b rotates at the end in the transport direction, the end of the bristle block 2b rises to a position higher than the surface 2a of the cutting table 2. At the stepped portion that transitions from the front surface 2a to the end on the carry-out side, there is provided a comb 2c in which the surface is inclined and claws are arranged at intervals in a direction perpendicular to the paper surface, and then transitions to a flat table 2d. . In the comb 2c, the claw enters the bristles of the bristle block 2b so that the sheet material 7 and the like to be carried out are not wound around the end portion and are transferred to the carry-out table 2d.

  The sheet material threading device 10 is provided with a thread supply mechanism 11 capable of supplying a thread 9 for marking in a subsequent process of the cutting process. In the yarn supply mechanism 11, the yarn package 11a can be set and the yarn 9 can be supplied through the yarn guide 11b. The cutting head 3 is provided with a thread holding mechanism 12, a thread penetrating needle 13, a drop prevention mechanism 14, a cutting mechanism 15, and a housing 16 that houses at least the drop prevention mechanism 14 and the cutting mechanism 15.

  As will be described later, in this embodiment, since it is possible to prevent a loop from being formed below the sheet material 7, the thread 9 is pulled out by being caught in the loop when the sheet material 7 is transported or handled. It is not. However, if the removal prevention mechanism 14 is provided, it is possible to prevent the removal more reliably.

  The yarn holding mechanism 12 is attached at a position facing the base end portion 13 b of the yarn penetrating needle 13 and can hold the yarn 9 supplied from the yarn supplying mechanism 11 to the yarn penetrating needle 13. The yarn penetrating needle 13 is hollow, and the yarn 9 supplied from the yarn supply mechanism 11 is accommodated in a hollow portion that extends from the distal end portion 13a to the proximal end portion 13b. If the tip 13a is pierced from above the sheet material 7 and pulled out, the thread 9 can be passed through the sheet material 7 up and down. When the tip portion 13 a of the thread penetrating needle 13 is stabbed into the sheet material 7, the tip portion 13 a protrudes downward from the housing 16. When the release preventing mechanism 14 is operated, the tip end portion 13 a of the thread penetration needle 13 is accommodated in the housing 16. The yarn holding mechanism 12 adjusts the length of the yarn 9 fed out from the tip end portion 13a by an operation at a timing as will be described later, and does not have a length that forms a loop below the sheet material 7. Can be. The perforation position 7a, which is a position where the thread 9 penetrates the sheet material 7, is set in advance by data, and is controlled by the control unit of the cutting machine 1 so that the cutting head 3 moves according to the data.

  The drop prevention mechanism 14 of the present embodiment forms a knot as a drop prevention portion 14 a on the thread 9 above the sheet material 7 after the thread 9 penetrates the sheet material 7 with the thread penetrating needle 13. As a knot forming mechanism, for example, a mechanism known in JP-A-6-250147 is used as a knotter. The cutting mechanism 15 cuts the yarn 9 on which the removal preventing portion 14 a is formed between the yarn penetrating needle 13 and the sheet material 7. The cutting mechanism 15 can also hold the thread penetrating needle 13 side of the thread 9 to be cut. The sheet material 7 side of the yarn 9 cut by the cutting mechanism 15 comes out of the housing 16, and the mark yarn 9 a remains on the sheet material 7. In the mark thread 9a, the slip-off preventing portion 14a is formed above the sheet material 7 by the slip-off preventing mechanism 14. Therefore, even when the sheet material 7 is sucked and held from below, it does not slip downward. Can be. Further, when the sheet material 7 is conveyed onto the carry-out table 2d or the like, even if the mark yarn 9a coming out below the sheet material 7 is rubbed and pulled, the whole mark yarn 9a is not pulled out. can do. In this way, the cutting machine 1 can add the mark thread 9a while cutting a sewing part and the like, and can reliably leave it as a mark for marking in a later process such as a sewing process. Become.

  A thread presser mechanism 19 is provided between the slip prevention mechanism 14 and the sheet material 7. The thread presser mechanism 19 presses the thread 9 so as to prevent the thread 9 from being supplied from the perforated position 7a penetrating the sheet material 7 when the slip prevention mechanism 14 forms the slip prevention part 14a.

  FIG. 2 shows an example of the shape of the tip portion 13 a of the thread penetration needle 13. 2A shows a shape partially viewed from the front, and FIG. 2B shows a shape when FIG. 2A is viewed from the right side. 2 (c) and 2 (d) show shapes of FIG. 2 (a) as seen from the front side obliquely upward and obliquely downward, respectively. The thread penetration needle 13 has a tubular shape extending in the direction of the axis 13c, and the thread 9 supplied from the thread supply mechanism 11 can be inserted through the hollow portion. The front end portion 13a has a positive inclined surface 13d that is cut at an acute angle with respect to the axis 13c, and back inclined surfaces 13e and 13f that are formed by cutting the back side of the positive inclined surface 13d at an acute angle with respect to the axis 13c from both sides. And have.

  By providing the back inclined surfaces 13e and 13f, the most distal end 13g can be put inside in the radial direction from the outer peripheral line of the shaft portion 13b. By entering the innermost tip 13g, it becomes easy to pierce the thread penetrating needle 13 into the sheet material 7, and the piercing performance is improved. Moreover, it becomes easy to go straight when penetrating into the sheet material 7 and the straightness is also improved. Furthermore, even if pierced, the sheet material 7 is hardly damaged, and damage can be prevented.

  The yarn 9 penetrates the sheet material 7 in a state where the end fed out from the opening 13h inside the forward inclined surface 13d is held at a certain length by the yarn holding mechanism 12. When the yarn 9 passes through the sheet material 7, the tip portion of the yarn 9 exposed from the opening 13h is folded upward and easily passes through the proximal end portion 13i of the opening 13h. Therefore, it is preferable that the edge of the base end side portion 13i of the forward inclined surface 13d that is the cutting edge of the thread penetration needle 13 is rounded. If the yarn 9 is rounded, the yarn 9 can be prevented from being broken even when the yarn 9 is folded back at the proximal end portion 13i.

  Further, since the thread penetrating needle 13 is tubular and allows the thread 9 to be inserted into the hollow portion, the thread 9 accommodated in the hollow portion does not come into contact with the sheet material 7 when the thread penetrating needle 13 is inserted into the sheet material 7. Can be. When the sheet material 7 is sucked and held by the cutter 1, the suction force also acts on the hollow portion, and when the thread penetrating needle 13 is pierced into the sheet material 7 and then lifted and pulled out, the thread 9 is attached. Can not be.

  As the thread penetrating needle 13, not only a hollow needle but also a sewing needle provided with a hole only near the tip of the needle or a hollow sewing needle provided with a hollow part communicating with the eye hole can be used. Even when a hollow needle is used as the thread penetrating needle 13, the thread 9 is not only inserted from the proximal end portion 13b to the distal end portion 13a as in this embodiment, but also from the middle between the proximal end portion 13b and the distal end portion 13a. You may make it penetrate to the front-end | tip part 13a.

  3 to 7 show an operation when the drop prevention portion 14a is formed by the drop prevention mechanism 14 of FIG. (A) of each figure shows the cross section of (b) of each figure seen from cut surface line AA shown in FIG.3 (b). Further, the driving source of the cutting head 3 and the cutting mechanism 15, the lifting mechanism of the thread penetration needle 13, and the lifting mechanism such as the housing 16 are not shown.

  FIG. 3 shows a step of moving the sheet material thread punching device 10 to the punching position 7 a by the cutting head 3 moving along the cutting table 2. In this embodiment, an end holding mechanism 15 a is housed in the housing 16 as a part of the cutting mechanism 15 in the vicinity. The removal prevention mechanism 14 also has a support member 14 b in the housing 16. The housing 16 is provided with a lower hole 16b that is inserted downward on the bottom surface 16a and an upper hole 16c that is inserted upward on the upper surface so that the thread penetration needle 13 can be inserted therethrough. In this step, the housing 16 is lifted so that the bottom surface 16 a is floated from the surface of the sheet material 7. The thread penetrating needle 13 is also raised to a position where the lower end tip portion 13 a is pulled into the housing 16. The end portion of the yarn 9 drawn from the tip portion 13a of the thread penetration needle 13 is held by the end holding mechanism 15a.

  The removal prevention mechanism 14 includes motors 17 and 18 as drive sources. An output shaft 17a of the motor 17 extends downward from above, rotates around an axis in the vertical direction, and a bevel gear 17b is attached. The bevel gear 17c meshes with the bevel gear 17b. The shaft of the bevel gear 17c is supported by the support member 14b so as to be rotatable about a horizontal axis perpendicular to the vertical direction, and a knot-forming hook 17d is attached to the tip. The output shaft 17a can also angularly displace a lever 17e for removing the thread 9 hung on the hook 17d. The output shaft 18a of the motor 18 angularly displaces the guide member 18b that guides the thread 9 so as to be hooked on the hook 17d. A thread presser mechanism 19 is provided in the vicinity of the lower hole 16b. The thread presser mechanism 19 can use a motor, a cylinder, a solenoid, or the like, although illustration of a drive source and the like is omitted. Further, when the resistance of the thread 9 penetrating the sheet material 7 is large, the thread presser mechanism 19 may not be provided. Furthermore, if the thread 9 is wound along the surface of the sheet material 7 from the perforated position 7a and the bent portion is pressed by the bottom surface 16a of the housing 16, the resistance of the thread 9 can be increased.

  FIG. 4 shows a process in which the cutting head 3 moves to the perforation position 7a where the yarn 9 is inserted into the sheet material 7, and both the yarn penetrating needle 13 and the housing 16 are lowered. The housing 16 has a bottom surface 16 a in contact with the surface of the sheet material 7. Only the thread penetration needle 13 continues to descend, the tip end portion 13a descends below the lower hole 16b of the housing 16, and the sheet material 7 is inserted vertically. The end holding mechanism 15 a releases the holding so that the held yarn 9 is released before the descent of the yarn penetrating needle 13 starts or at a timing during the descent. If the yarn 9 is pulled by the lowering of the thread penetrating needle 13, the yarn 9 can be released simply by weakening the holding force without releasing the holding.

  FIG. 5 shows the process of forming the knot-removal preventing portion 14 a in the yarn 9 in the housing 16. The thread presser mechanism 19 is provided between the sheet material 7 and the hook 17 d and the lever 17 e that form a knot by the removal prevention mechanism 14. The thread presser mechanism 19 presses the thread 9 so as to prevent the thread 9 from being supplied from the perforation position 7a side when the slip prevention mechanism 14 forms the slip prevention part 14a. It is possible to prevent 9 from being pulled upward.

  Hereinafter, in order to form a knot, the guide member 18b is angularly displaced and guided so that the thread 9 is hooked on the hook 17d. The yarn 9 is also hooked on the end holding mechanism 15a. Next, the hook 17d is rotated to wind the thread 9. Next, the lever 17e is angularly displaced, and the thread 9 is removed from the hook 17d.

  FIG. 6 shows a process of leaving the mark yarn 9 a on the sheet material 7. The press of the thread 9 by the thread presser mechanism 19 in FIG. 5 is released. Next, simultaneously with holding the yarn 9 by the end holding mechanism 15a, the cutting mechanism 15 cuts the yarn 9 on the side extending from the sheet material 7. Next, when the housing 16 is raised, the cut yarn 9 passes through the lower hole 16b and remains on the sheet material 7 as a mark yarn 9a.

  In the embodiment described above, the end holding mechanism 15a is provided in the cutting mechanism 15, and the end of the yarn 9 is held and cut simultaneously. However, the end holding mechanism 15a may be separated from the cutting mechanism 15 and the yarn 9 may be held and cut at different timings.

  FIG. 7 shows the configuration and operation of the yarn holding mechanism 12 of FIG. As shown in FIG. 7A, the yarn holding mechanism 12 is a pressing member that is provided facing the proximal end portion 13b of the thread penetration needle 13 as a path for supplying the yarn 9 from the yarn supply mechanism 11 to the thread penetration needle 13. 20 and a support member 21. As shown in FIG. 7B, the yarn holding mechanism 12 can hold the yarn 9 if the pressing member 20 presses the yarn 9 against the support member 21 side.

  The thread holding mechanism 12 is attached to the proximal end portion 13b of the thread penetrating needle 13 via the outer cylinder 30 and moves up and down together with the thread penetrating needle 13 by puncturing the thread penetrating needle 13. The yarn holding mechanism 12 descends while holding the yarn 9 so as to be relatively stationary with respect to the yarn penetrating needle 13, so that the length of the yarn 9 coming out from the tip 13a of the yarn penetrating needle 13 is kept constant, It is possible to prevent a loop from being formed below the sheet material 7. The thread holding mechanism 12 holds the thread 9 when the thread penetrating needle 13 pierces the sheet material 7 and releases the thread 9 when pulled out from the sheet material 7 in conjunction with the vertical movement. When the tip 13a of the thread penetrating needle 13 is pulled out from the sheet material 7, the thread holding mechanism 12 releases the thread 9, so that even if the thread penetrating needle 13 is pulled out from the sheet material 7, the thread 9 is removed from the sheet material 7. 7 can be left pierced.

  The outer cylinder 30 extends in the direction of the axis 13c of the thread penetrating needle 13, and includes a distal end portion 30a to which a proximal end portion 13b of the thread penetrating needle 13 is coupled, a proximal end portion 30b that receives driving of puncturing, and a distal end portion 30a and a base It has the hollow part 30c between the edge parts 30b. The distal end side 31 a of the inner cylinder 31 is accommodated inside the hollow portion 30 c of the outer cylinder 30. The distal end side 31 a of the inner cylinder 31 is inserted from the proximal end portion 30 b side of the outer cylinder 30, and the yarn 9 is supplied from the thread supply mechanism 11 to the proximal end side 31 b of the inner cylinder 31. In the inner cylinder 31, the hollow portion 31c communicates from the proximal end side 31b to the distal end side 31a. An intermediate cylinder 32 is inserted between the inner periphery of the hollow portion 30 c of the outer cylinder 30 and the outer periphery of the inner cylinder 31. The thread holding mechanism 12 is provided near the tip of the hollow portion 30c of the outer cylinder 30. The middle cylinder 32 has a distal end 32a facing the yarn holding mechanism 12, and receives a driving force for holding and releasing the yarn 9 by the yarn holding mechanism 12 at the proximal end 32b and transmits the driving force to the distal end 32a. The coupling between the proximal end portion 13 b of the thread penetration needle 13 and the distal end portion 30 a of the outer cylinder 30 is performed via a coupling member 33.

  As shown in FIG. 7A, the puncture driving of the thread penetrating needle 13 is performed with respect to the base end 30b of the outer cylinder 30 via the driving member 36 by the pneumatic cylinder 35 attached to the cutting head 3. Is called. In FIG. 7B, illustration regarding the driving of the piercing of the thread penetration needle 13 is omitted. A pneumatic cylinder 37 having a shorter stroke than the pneumatic cylinder 35 is attached to the driving member 36 and drives the base end 32 b of the middle cylinder 32. By this driving, as shown in FIG. 7B, the tip 32 a of the middle cylinder 32 swings the pressing member 20, and the thread 9 can be pressed between the supporting member 21.

  7A in which the tip 32a does not act on the pressing member 20, the pressing member 20 is urged counterclockwise by a kick spring so as to be separated from the support member 21. However, even if the pressing member 20 presses the support member 21 with its own weight, the pressing member 20 may not be biased if the pressing force is weak so that the thread 9 cannot be substantially held. Further, the thread holding mechanism 12 is not only configured to hold the thread 9 between the pressing member 20 and the support member 21, but similarly to the thread presser mechanism 19 described later, the thread 9 is opened and closed simultaneously by two members. It can also be realized with a sandwiching configuration. Further, it is also possible to adopt a configuration in which the yarn 20 is sandwiched between two rollers, the yarn 9 is held without rotating the roller, and the yarn 9 is released while allowing the rotation. Furthermore, not only the pneumatic cylinder 37 but also other actuators such as a solenoid and a motor can be used as a drive source for the yarn holding mechanism 12.

  Thus, the thread holding mechanism 12 has a triple cylinder structure of the outer cylinder 30, the intermediate cylinder 32, and the inner cylinder 31, and can hold the thread 9 at a position close to the proximal end portion 13b of the thread penetration needle 13. The influence of slack and elongation of the yarn 9 can be reduced. In addition, if the compressed air for controlling the air pressure to the air cylinder 35 is branched by controlling the air pressure to the air cylinder 37, the thread penetrating needle 13 is lowered and the front end portion 13a is pierced into the sheet material 7. Simultaneously with the start of the descent, the holding of the yarn 9 is also started, and the holding can be continued until the yarn penetrating needle 13 is raised. While the thread penetrating needle 13 is raised and pulled out from the sheet material 7, the thread 9 can be released.

  The yarn holding mechanism 12 may be provided in a state of being fixed to the cutting head 3 without being moved up and down together with the yarn penetrating needle 13. When the thread holding mechanism 12 is fixed, in order to maintain the state in which the thread 9 is being fed out from the distal end portion 13a even when the thread penetrating needle 13 is lowered, the length corresponding to the descending amount of the thread penetrating needle 13 is required. The yarn 9 needs to be sent out. That is, the thread holding mechanism 12 may not be moved up and down as long as it has a function of feeding the thread 9.

  FIG. 8 shows the configuration and operation of the thread presser mechanism 19 of FIG. As shown in FIG. 8A, the thread presser mechanism 19 is provided around the lower hole 16 b of the housing 16 and includes a solenoid 40, a pushing member 41, and a pulling member 42. As shown in FIG. 8A, in a state where the thread 9 inserted through the lower hole 16b cannot be pressed, the pressing portion 41a of the pushing member 41 and the pressing portion 42a of the retracting member 42 are separated from the yarn 9. As shown in FIG. 8B, in a state where the thread 9 is pressed, the pressing portions 41a and 42a on both sides of the path of the thread 9 are pinched from both sides so as not to change the path of the thread 9. Even if the yarn 9 is pressed, the path does not change, so that the operation of forming the removal preventing portion 14a can be performed stably.

  The pushing member 41 and the pulling-back member 42 are coupled to both ends of the lever 43. The lever 43 is oscillated and displaced about an intermediate oscillating shaft 44. The push-out member 41 is provided with a guide notch 41b, the pull-back member 42 is provided with a guide long hole 42b, and guide shafts 45 and 46 are inserted thereinto. The push-out member 41 and the pull-back member 42 are guided so as to move in the left-right direction in the figure by the guide shafts 45 and 56 inserted into the guide notch 41b and the guide long hole 42b. The pushing member 41 is coupled to the output shaft of the solenoid 40 and one end of the lever 43. The other end of the lever 43 is engaged with the recess 42 c of the pullback member 42. As a result, when the output shaft of the solenoid 40 is retracted, a released state in which the yarn 9 is not held is obtained as shown in FIG. When the output shaft of the solenoid 40 is pushed out, the thread 9 is held as shown in FIG.

  FIG. 9 shows the structure of the mark yarn 9a remaining on the sheet material 7 in FIG. The sheet material 7 is penetrated by the penetrating portion 9b. A knot 9 c is formed above the sheet material 7. The knot 9c continues to the cut end 9e through the loop 9d. If the knot 9c is pulled toward the cut end portion 9e, the loop 9d is removed, and the knot 9c can be easily eliminated. However, even when pulled toward the penetrating part 9b, the knot 9c is only tightened, and the loop 9d does not come off. Therefore, the knot 9c and the loop 9d function as the disconnection prevention unit 14a. Since the knot 9c is formed on the yarn 9 to form the removal preventing portion 14a, the use of only the yarn 9 can surely prevent the removal.

  FIG. 10 shows a form of a slip-off preventing portion 14a that can be left on the sheet material 7 as a mark thread 9a. Since the slip-off preventing portion 14a is formed above the sheet material 7 by the slip-off preventing mechanism 14, it is possible to prevent the sheet material 7 from slipping downward while the sheet material 7 is sucked and held from below. It is possible to add the mark yarn 9a with the machine 1 and reliably leave it as a mark for marking.

  10 (a), 10 (b), and 10 (c) are based on the length of the yarn 9 fed out from the opening 13i of the tip portion 13a when the thread penetrating needle 13 is pierced into the sheet material 7. FIG. The position of the lower end portion 9f of the yarn 9 that changes as shown in FIG. That is, the lower end portion 9f is at a different position depending on the timing at which the end holding mechanism 15a releases the end portion of the yarn 9. If the end holding mechanism 15a releases the end of the thread 9 before the thread penetrating needle 13 starts to descend, the lower end 9f is likely to come out below the sheet material 7 as shown in FIG. When the end holding mechanism 15a releases the end of the thread 9 during or after the thread penetrating needle 13 is lowered, the thread 9 is folded under the sheet material 7 as shown in FIG. 10 (b) or FIG. 10 (c). A part of the lower end portion 9f stays inside the sheet material 7 or comes out above the sheet material 7. For this reason, the U-turn part 9g is highly likely to be formed below the sheet material 7. In this embodiment, even if the end holding mechanism 15a releases the end of the thread 9 while the thread penetrating needle 13 is lowered, the thread holding mechanism 12 holds the thread 9, so that the state of FIG. It can be obtained stably. If the U-turn portion 9g is formed below the sheet material 7 as shown in FIGS. 10B and 10C, the comb 2c may be caught on the claw of the cutting table 2 on the carry-out side.

  It should be noted that the drop prevention part 14a may be made difficult to penetrate the sheet material 7. Therefore, before cutting, not only a knot 9c provided in the middle of the yarn 9 as shown in FIG. 8 is formed, but also connected to another yarn with a knotter, or connected to another yarn with a splicer that loosens and entangles the end of the yarn. You can do it. Further, in the slip-off preventing portion 14a, processing may be performed to enlarge the diameter of the yarn 9, or another material may be added.

DESCRIPTION OF SYMBOLS 1 Cutting machine 2 Cutting table 3 Cutting head 7 Sheet material 9 Yarn 9a Marking thread 9c Knot 9g U-turn part 10 Sheet material threading device 11 Supply mechanism 12 Thread holding mechanism 13 Thread penetration needle 14 Pull-out prevention mechanism 14a Prevention of slipping Part 15 Cutting mechanism 15a End holding mechanism 16 Housing 19 Yarn presser mechanism 30 Outer cylinder 31 Inner cylinder 32 Middle cylinder

Claims (8)

A sheet material threading device for leaving a thread penetrating at a preset position on the sheet material,
A thread supply mechanism capable of supplying a thread;
It is possible to move from the upper part of the sheet material to the perforation position. A thread penetrating needle that feeds the supplied thread from the tip and penetrates the perforated position of the sheet material;
A cutting mechanism for cutting a thread between the tip of the thread penetrating needle punctured at the perforated position of the sheet material and the perforated position;
Provided in the path for supplying the thread from the thread supply mechanism to the thread penetrating needle,
When piercing the thread penetrating needle into the sheet material, the supply of the thread is limited so that the length of the thread cut by the cutting mechanism is kept below a certain length,
Including a thread holding mechanism for releasing the restriction on the supply of the thread when the thread penetrating needle is pulled out of the sheet material,
A sheet material threading device characterized by that. The yarn holding mechanism is
Attached at a position facing the proximal end of the thread penetrating needle, moved with the thread penetrating needle in the puncturing, keeping the distance from the proximal end constant,
When piercing a thread penetrating needle into the sheet material, hold the thread,
Release the thread when pulling out the thread penetrating needle from the sheet material,
The sheet material threading device according to claim 1, wherein: An outer cylinder extending in the direction of the puncture,
A distal end portion to which a proximal end portion of the thread penetrating needle is coupled;
A base end receiving the driving of the stab and pull, and an outer cylinder having a hollow portion between the tip end and the base end;
A hollow inner cylinder extending in the direction of puncture,
Inside the hollow portion of the outer cylinder, there is a distal end side inserted from the proximal end side of the outer cylinder, and a proximal end side to which the yarn is supplied from the yarn supply mechanism,
An inner cylinder through which the yarn passes through the hollow portion on the distal end side from the proximal end side;
Including an inner cylinder inserted between the inner periphery of the hollow portion of the outer cylinder and the outer periphery of the inner cylinder,
The yarn holding mechanism is housed in the distal end portion of the outer cylinder,
3. The intermediate cylinder according to claim 1, wherein a tip of the middle cylinder faces the yarn holding mechanism, and a driving force for holding and releasing the yarn by the yarn holding mechanism is received at the base end and transmitted to the tip. Sheet material threading device. An end holding mechanism for holding an end of the yarn penetrating needle on the tip side among the ends of the yarn cut by the cutting mechanism;
The yarn threading device for a sheet material according to any one of claims 1 to 3, wherein A slip prevention mechanism that forms a slip prevention portion for the yarn between the tip portion and the perforation position of the thread penetrating needle stabbed into the perforation position of the sheet material before being cut by the cutting mechanism. In addition,
The sheet material threading device according to any one of claims 1 to 4, wherein: A thread presser mechanism that is provided between the slip-off prevention mechanism and the sheet material and that presses the thread from being fed from the perforated position side when the slip-off prevention mechanism forms the slip-off prevention part. Further including
The sheet material threading device according to claim 5, wherein the sheet material is threaded. The thread presser mechanism is provided on both sides of the thread path between the slip prevention mechanism and the sheet material, and when pressing the thread, is sandwiched from both sides so as not to change the thread path.
The yarn threading device for sheet material according to claim 6. The thread penetrating needle is tubular with the direction of puncturing as an axis, and receives supply of the thread from the thread supply mechanism to the base end part.
The tip is
A positively inclined surface having a shape cut at an acute angle with respect to the axis;
The back side of the positively inclined surface has a back inclined surface with a shape cut at an acute angle with respect to the axis from both sides so as to be tapered.
The yarn threading device for a sheet material according to any one of claims 1 to 7.

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