JP2007105283A - Needle-threading device, and sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle-threading device which can easily and surely pass a sewing thread through a needle hole by a simple mechanism, and to provide a sewing machine. <P>SOLUTION: This needle-threading device 10 is constituted by being equipped with an air suction tube 11, a supporting member 15, a fixing section 16, and a sliding mechanism 18. In this case, the air suction tube 11 has an air suction port 13 which keeps elastic a one end packing 12 fitted while protruding, and the other end connected with a connecting tube 14 which communicates with an air suction device 17 and has flexibility. The supporting member 15 supports the air suction tube 11 while making the air suction port 13 face the needle hole 5a. The fixing section 16 is fixed to a sewing machine body 3. The sliding mechanism 18 is provided between the supporting member 15 and the fixing section 16. In this case, the sliding mechanism 18 makes the air suction port 13 freely movable in the longitudinal direction from a position coming into contact with the sewing needle 5 to a separated position by making the supporting member 15 longitudinally move to the fixing section 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a threading device for inserting a sewing thread into a needle hole of a sewing needle of a sewing machine and a sewing machine equipped with the threading device.

In recent years, sewing machines have been diversified and automated, such as a sewing machine that automatically supplies a desired sewing thread using a plurality of types of sewing threads, and a sewing machine that can select a plurality of sewing methods. The process of inserting the sewing thread into the needle hole of the sewing needle is the same, and a threading device for automatically inserting the sewing thread into the needle hole has been proposed (for example, see Patent Document 1). According to this threading device, when the position of the thread holder is below the preparation position for threading, the threading rod and the thread holder are lowered to the end of the first region by lowering the operating member to hold the thread. The thread guided by the body and the threading piece of the threading bar is guided below the needle hole, and the threading bar is rotated in the second region to advance the threading hook into the needle hole. Then, the thread holding rod is rotated by the operation of the thread holding body position converting means until the threading rod rotates and the threading hook retracts from the needle hole in the second region that starts when the operating member is raised or released. The thread is inserted into the needle hole by holding the thread on the threading hook.
JP 2005-46537 A

  However, according to Patent Document 1, various members such as a needle, a thread holder, a threading hook, and a threading rod are interlocked so that a sewing thread can be inserted into the needle hole. For this reason, the number of parts is large, and the apparatus is very complicated. In addition, since the threading hook is advanced into a fine needle hole, a very high level of assembly accuracy is required. For this reason, the cost of the apparatus is increased, and an apparatus space is required, and the provision of such a threading device in the vicinity of the tip of the needle has a problem of hindering the originally intended sewing operation. there were.

  The present invention has been made in view of the above-described circumstances, and provides a threading device and a sewing machine that can easily and surely insert a sewing thread into a needle hole with a simple mechanism. .

In order to solve the above problems, the present invention proposes the following means.
The present invention is a threading device for inserting a sewing thread into a needle hole of a sewing needle fixed to a needle bar protruding downward from a sewing machine body, and has an intake port at one end and an intake device at the other end. An intake pipe to which a connecting pipe having communication flexibility is connected; a support member that supports the intake pipe with the intake port opposed to the needle hole; a fixing portion that is fixed to the sewing machine body; A slide mechanism that is provided between a support member and the fixed portion, and allows the intake port to move forward and backward from a position separated from a position contacting the sewing needle by moving the support member forward and backward with respect to the fixed portion. It is characterized by comprising.

  According to the threading device of the present invention, the suction port of the intake pipe supported by the support member is brought into contact with the position of the needle hole of the sewing needle by fixing the sewing machine body with the fixing portion and driving the slide mechanism. be able to. If the intake device is driven in this state, air is sucked into the intake device from the needle hole communicating with the intake pipe via the intake pipe and the connecting pipe. For this reason, if the sewing thread is arranged on the side opposite to the side where the suction port of the needle hole comes into contact, the tip of the sewing thread is guided to the needle hole by suction and inserted into the suction pipe communicating with the needle hole. The sewing thread can be inserted through the needle hole. If the intake device is stopped and the intake port is retracted from the needle hole by the slide mechanism, the sewing thread is pulled out from the intake pipe while being inserted into the needle hole.

In the above threading device, it is more preferable that an elastic packing protrudes and is fitted into the intake port of the intake pipe.
According to the threading device of the present invention, since the packing protrudes and fits into the intake port of the intake pipe, the airtightness of the portion where the sewing needle and the intake port of the intake pipe abut can be improved. For this reason, the sewing thread can be more securely inserted into the needle hole by the intake air by the intake device.

Furthermore, in the above threading device, it is more preferable that the fixing portion includes a position adjusting mechanism that positions the intake port in the vertical direction when the fixing portion is fixed to the sewing machine body.
According to the threading device of the present invention, the position of the intake port can be adjusted in the vertical direction with respect to the sewing needle that moves up and down during the sewing operation. The sewing thread can be inserted through the needle hole.

Further, in the above threading device, the fixing portion includes a rotation mechanism that moves the intake port backward with respect to the needle hole and moves upward when the fixing portion is fixed to the sewing machine. More preferred.
According to the threading device of the present invention, since the entire device can be moved backward with respect to the needle hole and moved upward by the rotation mechanism at the time of the sewing work, the workability of the sewing work is further improved. Can do.

The present invention also proposes a sewing machine provided with the above threading device.
According to the sewing machine of the present invention, by providing the above threading device, it is possible to easily and surely insert the sewing thread into the needle hole and perform the sewing work.

  According to the threading device and the sewing machine of the present invention, a simple mechanism including an intake pipe, a support member, a fixing member, a slide mechanism, and the like can be used to easily and surely place the sewing thread into the needle hole regardless of the operator's technique. It can be inserted.

  1 to 6 show an embodiment according to the present invention. FIG. 1 shows an overall view of the sewing machine. 2 is a side view of the threading device, FIG. 3 is a cross-sectional view of the intake port as viewed from above, and FIG. 4 is a front view of the intake port. FIGS. 5 and 6 are explanatory views for inserting the sewing thread into the needle hole by the threading device.

  As shown in FIG. 1, the sewing machine 1 includes a pedestal 2, a sewing machine main body 3 provided on the upper part of the pedestal 2, a needle bar 4 that protrudes downward from the sewing machine main body 3, and a needle bar 4. A sewing needle 5 that is fixed and has a needle hole 5 a and a threading device 10 that is fixed to the sewing machine body 3 are provided. As shown in FIG. 2, the threading device 10 has an intake port 13 into which an elastic packing 12 protrudes and is fitted at one end 11a, and an intake tube 11 to which a connection tube 14 is connected at the other end 11b. And a support member 15 that supports the intake pipe 11 and a fixing portion 16 that is fixed to the sewing machine body 3. Further, as shown in FIG. 1, the connecting pipe 14 has flexibility and communicates with an intake device 17 fixed to the sewing machine body 3.

  Further, as shown in FIG. 2, a slide mechanism 18 is provided between the support member 15 and the fixed portion 16. The slide mechanism 18 has one end 19 a fixed to the support member 15, the other end 19 b fixed to the fixing portion 16, an extendable air cylinder 19, and substantially parallel to the air cylinder 19, and one end 20 a being a support member. 15, and the other end 20 b is provided with a shaft body 20 that is inserted into the through hole 16 a of the fixing portion 16 so as to freely advance and retract. The air cylinder 19 is connected to an air supply / exhaust device (not shown), and can be expanded and contracted by being pressurized or depressurized. In addition, the intake pipe 11 has a shape bent into a substantially S shape including a distal end portion 11c, an oblique material portion 11d, and a proximal end portion 11e. The support member 15 supports the base end portion 11e of the intake pipe 11 in a state where the fixing portion 16 is fixed to the sewing machine main body 3, and the diagonal member 11d is positioned downward from the base end portion 11e according to the tip end portion 11c. The distal end portion 11c is disposed so that the air inlet 13 faces the needle hole 5a and is substantially horizontal. The air cylinder 19 of the slide mechanism 18 expands and contracts so that the intake port 13 can advance and retreat to a position B that is separated from a position A that contacts the position of the needle hole 5 a of the sewing needle 5.

  As shown in FIG. 3, the cross-sectional shape of the packing 12 of the intake port 13 as viewed from the front is such that the inner peripheral surface 12a can be fitted in close contact with the intake pipe 11, and the outer peripheral surface 12b is substantially rectangular. Each side has a cross-sectional shape set larger than the diameter of the needle hole 5a. Further, as shown in FIG. 4, the cross-sectional shape of the tip end portion 12 c of the packing 12 as viewed from above is a shape protruding from the inner peripheral surface 12 a to the outer peripheral surface 12 b. The packing 12 is preferably made of, for example, rubber, vinyl chloride or the like, has elasticity, and is made of a material that can come into close contact with the sewing needle 5.

  Next, the operation of the sewing machine 1 and the threading device 10 will be described. First, as shown in FIG. 2, the sewing thread T is arranged so that the tip T1 of the sewing thread T is located in the vicinity of the side opposite to the side facing the air inlet 13 of the needle hole 5a, and the air cylinder of the slide mechanism 18 is arranged. 19 is extended, and the air inlet 13 is moved from the position B to the position A so as to contact the position of the needle hole 5a of the sewing needle 5. Then, by driving the intake device 17, the sewing needle 5 is attracted to the intake port 13 as shown in FIG. 4. At this time, since the cross-sectional shape of the front end portion 12c of the packing 12 is a cross-sectional shape protruding from the inner peripheral surface 12a to the outer peripheral surface 12b, it can be brought into close contact with the sewing needle 5 having a substantially circular cross-sectional shape. 5 and the packing 12 are reliably adsorbed from the portion where they contact each other without air leakage. Therefore, as shown in FIGS. 3 and 5, the needle hole 5 a communicates with the intake pipe 11, and the sewing thread T disposed in the vicinity of the needle hole 5 a by the suction action of the intake device 17 is connected to the needle hole 5 a and the needle hole 5 a. It is inserted into the intake pipe 11. Then, after confirming that the sewing thread T has been securely inserted up to the intake pipe 11, the drive of the intake device 17 is stopped.

  Next, as shown in FIG. 6, the air cylinder 19 of the slide mechanism 18 is contracted to retract the air inlet 13 to the position B. At this time, since the drive of the intake device 17 is stopped, the sewing thread T is pulled out from the intake pipe 11 while being inserted into the needle hole 5a, and the threading process of the sewing thread T by the threading device 1 is completed. .

  As described above, in the threading device 10, by the suction action of the air suction device 17, the sewing thread T is easily and reliably sucked and inserted into the needle hole 5a by the simple mechanism as described above regardless of the operator's technique. Can be made. In addition, since the intake pipe 11 has a substantially S-shape and is disposed below the support member 15 and the distal end portion 11c is disposed substantially horizontally, the intake port 13 can be easily visually observed. Can do. Further, since the suction port 13 can be moved back and forth from the position A to the position B by the slide mechanism 18, when the sewing thread T is inserted into the needle hole 5a and the sewing operation is performed, the threading device 10 allows the field of view near the sewing needle 5 to be viewed. There is no hindrance and the workability of the sewing work is improved.

  FIG. 7 shows a first modification of the present invention, and shows an overall view of the sewing machine. In this modification, the same members as those used in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7, the fixing portion 26 of the threading device 25 includes a first fixing member 27 that is fixed to the sewing machine body 3 and extends downward, and an air cylinder 19 of the slide mechanism 18. 20 includes a second fixing member 28 having a through-hole into which 20 is inserted, and a position adjusting mechanism 29 that moves the second fixing member 28 in the vertical direction relative to the first fixing member 27 to position the second fixing member 28. The position adjusting mechanism 29 includes an elongated hole 29a that penetrates from the surface 27a facing the second fixing member 28 of the first fixing member 27 to the opposite surface 27b, and the first fixing member of the second fixing member 28. 27 is formed by a screw hole 29b formed on a surface opposed to 27, and a bolt 29c inserted into the long hole 29a and screwed into the screw hole 29b. The long hole 29a is long in the vertical direction. The diameter of the head 29d of the bolt 29c is set to be larger than the diameter in the lateral direction of the elongated hole 29a. For this reason, the first fixing member 27 and the second fixing member 28 are integrated by tightening the bolt 29 c and the head 29 d abutting against the surface 27 b of the first fixing member 27.

  Further, the threading device 25 includes a thread supply unit 30 fixed to the second fixing member 28 of the fixing unit 26. The thread supply portion 30 is a protruding member that is extended so that the proximal end portion 31a is fixed to the second fixing member 28 and the distal end portion 31b is located on the side opposite to the side where the suction port 13 of the sewing needle 5 is located. 31 and a guide member 32 in which a distal end portion 32a is disposed close to the needle hole 5a and a proximal end portion 32b is fixed to the distal end portion 31b of the protruding member 31.

  In such a threading device 25, even if the position of the needle hole 5a of the sewing needle 5 has moved up and down, the position adjustment mechanism 29 moves the position of the intake port 13 up and down so as to match the position of the needle hole 5a. Can be adjusted. That is, the position of the air inlet 13 is adjusted by loosening the bolt 29c, moving and adjusting the second fixing member 28 within a range in which the bolt 29c can move inside the elongated hole 29a, and tightening the bolt 29c again. Can do. Further, by disposing the sewing thread T on the guide member 32 of the thread supply unit 30, the tip T1 of the sewing thread T can be brought close to the vicinity of the needle hole 5a, and the sewing thread can be easily and reliably attracted to the needle hole 5a by a suction action. T can be inserted. The position adjustment mechanism 29 is not limited to the above-described configuration. For example, a configuration is provided in which either one of the first fixing member 27 and the second fixing member 28 is provided with a rail extending vertically, and the other is provided with a fitting portion that can slide and be fixed on the rail. It is also good.

  FIG. 8 shows a second modification of the present invention, and shows an overall view of the sewing machine. In this modification, the same members as those used in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 8, the fixing portion 36 of the threading device 35 is fixed to the sewing machine main body 3, the third fixing member 37 extending downward, and the air cylinder 19 of the slide mechanism 18 are fixed to each other. And a fourth fixing member 38 into which 20 is inserted. The fixing portion 36 further includes a rotation mechanism 39 and is configured to allow the fourth fixing member 38 to rotate with respect to the third fixing member 37. That is, the rotation mechanism 39 is fixed to the shaft 39 a provided at the end of the fourth fixing member 38 and the end of the third fixing member 37. And a bearing 39b fitted on the shaft 39a. The fourth fixing member 38 and the sewing machine main body 3 are provided with magnets 40 and 41, and the fourth fixing member 38 is rotated with respect to the third fixing member 37 so that the air inlet 13 is moved from the needle hole 5a. When the position C is moved backward and moved upward, the magnets 40 and 41 come into contact with each other and the intake port 13 can be fixed at the position C.

  In such a threading device 35, when the sewing thread T is inserted through the needle hole 5a of the sewing needle 5, the air inlet 13 is arranged at the position B, and when performing the sewing operation, the rotation mechanism 39 causes the fourth threading device 35 to move to the fourth position. The fixing member 38 can be rotated to retract the air inlet 13 to the position C. For this reason, workability | operativity at the time of performing a sewing operation can be made still better. In addition, although what fixed the inlet 13 in the state of the position C was made into the magnets 40 and 41, it is not restricted to this. For example, a protrusion is provided on the fourth fixing member 38 and a hook-like engagement member is provided on the sewing machine body 3 so that the engagement member can be engaged with the protrusion when the suction port 13 is located at the position C. It is good also as a simple structure.

Although the packing 12 protrudes and is fitted to the intake port 13 of the one end 11a of the intake pipe 11, the present invention is not limited to this, and the one end 11a of the intake pipe 11 may be in direct contact. . FIG. 9 is a cross-sectional view of the distal end portion of the intake pipe 45 of the threading device of the third modified example. The Y-shaped cross section matches the cross-sectional shape of the sewing needle 5 with which the one end 45a abuts. It is formed into a shape. Even in such a case, the airtightness can be further improved, and the sewing thread can be more securely inserted into the needle hole.
Moreover, in this embodiment and the modification, although the lockstitch sewing machine was mentioned as the example as the sewing machine 1, it does not restrict to this. For example, a rake sewing machine may be used. In the case of a rake sewing machine, the sewing needle is located on the left and right, and the needle hole communicates vertically. For this reason, the tip end portion 11c of the intake pipe 11 may be arranged from the lower side of the sewing needle to the upper side or from the upper side to the lower side of the sewing needle so as to be movable up and down by the slide mechanism 18.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

1 is an overall view of a sewing machine according to an embodiment of the present invention. It is a side view of the threading device of the embodiment of the present invention. It is a front view of the inlet port of embodiment of this invention. It is sectional drawing seen from the upper side of the inlet port of embodiment of this invention. It is explanatory drawing which inserts a thread into a needle hole with the threading device of embodiment of this invention. It is explanatory drawing which inserts a thread into a needle hole with the threading device of embodiment of this invention. It is a side view of the threading device of the 1st modification of an embodiment of this invention. It is a general view of the sewing machine of the 2nd modification of embodiment of this invention. It is sectional drawing seen from the upper side of the inlet port of the 3rd modification of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 3 Sewing machine body 4 Needle bar 5 Sewing needle 5a Needle hole 10, 25, 35 Threading device 11, 45 Intake pipe 11a, 45a One end 11b Other end 12 Packing 13 Intake port 14 Connection pipe 15 Support member 16, 26, 36 Fixed part 17 Intake device 18 Slide mechanism 29 Position adjustment mechanism 39 Turning mechanism T Sewing thread

Claims (5)

A threading device for inserting a sewing thread into a needle hole of a sewing needle fixed to a needle bar protruding downward from a sewing machine body,
An intake pipe having an intake port at one end and a flexible connection pipe communicating with the intake device at the other end;
A support member that supports the intake pipe with the intake port facing the needle hole;
A fixing portion fixed to the sewing machine body;
A slide that is provided between the support member and the fixed portion and allows the intake port to move forward and backward from a position away from a position in contact with the sewing needle by moving the support member forward and backward with respect to the fixed portion. A threading device comprising a mechanism. The threading device according to claim 1, wherein
A threading device, wherein an elastic packing protrudes and is fitted into the intake port of the intake pipe. The threading device according to claim 1 or 2,
The threading device according to claim 1, wherein the fixing portion includes a position adjusting mechanism that positions the intake port in a vertical direction when the fixing portion is fixed to the sewing machine body. The threading device according to any one of claims 1 to 3,
The threading device according to claim 1, wherein the fixing portion includes a rotating mechanism that moves the intake port backward and moves upward with respect to the needle hole when the fixing portion is fixed to the sewing machine body.   A sewing machine comprising the threading device according to any one of claims 1 to 4.

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