JPS6257583A - Automatic yarn passing type zigzag sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a zigzag sewing machine capable of automatic threading, and more specifically, it is equipped with a needle bar capable of vertical reciprocating movement and horizontal swinging movement. In a zigzag sewing machine equipped with a threading device that captures the sewing thread that has been supplied to the eye of a sewing needle attached to the lower end and inserts it into the eye, the sewing thread pulled out from the thread supply source can be pulled out by simply pressing the operating body. With a simple operation, it can be transferred to the eye hole of the sewing needle, and at that time,
A zigzag sewing machine capable of automatic threading, wherein the thread holding member holding the sewing thread is moved to a position that matches the swing stop position of the needle bar, so that the sewing thread can be reliably captured by the threading device. It is related to.

The preparatory work for sewing processed fabric using a conventional sewing machine is as follows:
It is necessary to hook the needle thread pulled out from the thread spool to various members such as the thread tension plate, thread take-up spring body, thread take-up lever, etc. in a predetermined order and route, and then insert the sewing thread into the eye of the sewing needle. be. This series of threading operations requires a threading device that has a zigzag mechanism that reciprocates the needle bar up and down as well as oscillates it laterally, and that automatically threads the sewing thread into the eye of the sewing needle. A so-called zigzag sewing machine equipped with a zigzag sewing machine is no exception.

Problems to be Solved by the Invention A threading device equipped with a threading hook, which is suitably adopted in recent zigzag sewing machines, simply performs the task of inserting the upper thread into the eye of the sewing needle instead of manually. However, the above-described series of operations for hanging the upper thread on the thread tension plate, thread take-up spring body, thread take-up lever, etc., is not omitted or facilitated. Moreover, the task of threading the upper thread along a predetermined thread supply path is generally an error-prone task for beginners of sewing machines, and is a troublesome task even for experienced users. If the order of this series of threading is even slightly incorrect, the sewing work cannot be completed even if the threading into the eye of the sewing needle is completed, so it is important to ensure that this threading is carried out reliably. requested.

An example of such a device for automatically threading and threading a sewing machine is the invention "Automatic threading device for a sewing machine" proposed by the present applicant.

It is published as Japanese Patent Application Laid-Open No. 59-95095.

The disclosed invention is capable of automatically threading the needle thread pulled out from the needle thread supply source onto the thread take-up spring body and automatically passing the thread through the eye of the sewing needle, and is highly praised from this point of view. It is possible. However, this device requires a first operation to transport the sewing thread downward from the thread take-up, and a second operation to bring the sewing thread closer to the threading hook inserted into the eye of the sewing needle. However, there was a problem with ease of operation.

Furthermore, in a zigzag sewing machine, a needle bar with a sewing needle attached to its lower end swings laterally at a predetermined angle, so that the stopping position of the sewing needle in the lateral direction is indefinite. However, in the invention disclosed above, the notch part of the manual operating body around which the sewing thread is wrapped is structured to be guided only linearly by the guide shaft, and the notch part of the manual operating body around which the sewing thread is wound is guided only linearly by the guide shaft, so that the notch part of the manual operating body around which the sewing thread is wound is guided only linearly by the guide shaft, and the notch part of the manual operating body around which the sewing thread is wound is guided only linearly by the guide shaft. A mechanism for following this and moving the notch of the manual operation body in the lateral direction is not adopted. Therefore, according to this invention, it is difficult to automatically perform the above-mentioned threading with a zigzag sewing machine. Furthermore, the mechanism for transporting the sewing thread is complicated, and operational reliability is also poor.

Purpose of the Invention The present invention has been proposed in order to suitably solve the problems inherent in the conventional zigzag sewing machine described above. The threading operation of transporting the sewing thread to the front, capturing the sewing thread, and pulling it out from the eye of the sewing needle can be easily accomplished by a single movement operation of the operating body, and also prevents the needle bar from stopping when the needle bar swings in the horizontal direction. A zigzag sewing machine capable of automatic threading, in which the thread holding member holding the sewing thread is automatically moved to the eye position of the sewing needle, regardless of the position, so that the thread can be reliably captured by the threading device. The purpose is to provide

Means for Solving the Problems In order to suitably solve the above-mentioned problems, a zigzag sewing machine capable of automatic threading according to the present invention is provided with a needle bar that is attached to the lower end of the needle bar that is capable of reciprocating up and down movement and swinging movement in the lateral direction. In a sewing machine equipped with a sewing needle having a hole through which the sewing thread is inserted, and a threading device operable to capture the sewing thread that has been fed to the hole of the sewing needle and pass it through the hole, releasing the sewing thread. a thread holding member having a thread holding end that can hold the thread; the thread holding member is supported such that the thread holding end can move in the swinging direction of the needle bar; an actuating member operable to move the eye to the eye;
an operating body that can be moved to operate the operating member; and an operating body that is provided on a support frame that swingably supports the needle bar or a member that is operatively connected to the support frame, and that It is characterized by comprising a guide member that can be engaged with the thread holding member to guide the sewing needle to a position close to the eye hole of the sewing needle.

According to the zigzag sewing machine capable of automatic threading according to this configuration, when the operating body is operated to move in one direction, the operating member connected in relation to the linking member connected to the operating body starts to descend. The thread held by the thread holding member supported by the actuating member is pulled out downward. In addition, in synchronization with the lowering of the actuating member and with a delay in speed, the thread feeding member fixed to the linking member starts lowering and locks the sewing thread held (or to be held) on the thread take-up. Guide it to the vicinity of the thread take-up spring body while it is hooked to the end. Furthermore, the thread holding member holding the sewing thread transfers the sewing thread to the eye of the sewing needle by descending. At this time, in the zigzag sewing machine, since the needle bar swings in the horizontal direction, the sewing needle stops at an undefined position together with the needle bar, but the thread holding member is connected to the support frame that swingably supports the needle bar. The sewing thread is guided by a guide member disposed on the needle bar in the swinging direction of the needle bar, and engages the sewing thread with a threading device waiting near the eye of the sewing needle.

The threading device captures the suture and completes threading into the eye.

Embodiment Next, a preferred embodiment of the automatic threading zigzag sewing machine according to the present invention will be described in detail with reference to the accompanying drawings. Note that FIGS. 1 to 1 are front views showing the overall external configuration of a sewing machine incorporating an automatic threading mechanism according to the present invention, and FIG. 2 is a partially cutaway front view showing main parts of the sewing machine shown in FIG. 1. 3 is a plan view of the sewing machine shown in FIG. 1, and FIG. 4 is a partially cutaway plan view showing essential parts of the sewing machine shown in FIG. 3. Moreover, FIG. 5 is a 5-5111A cross-sectional view of FIG.

FIG. 6 is a cross-sectional view taken along line 6--6 in FIG.

(Basic Structure of Sewing Machine) Particularly in FIG. 1, a sewing machine frame 21 is provided on a base 22, and this sewing machine frame 21 extends horizontally above the base 22 and has a sewing machine on the upper part. It basically consists of a lower arm 23 provided with a processing surface, an upper arm 24 extending in parallel above this lower arm 23 and having a sewing machine head at its tip, and a pillar part 25 integrally connecting both arms. As shown in FIGS. 2 and 5, a steel plate is used inside the sewing machine head of the upper arm 24, which is integrally injection-molded with hard synthetic resin to reduce weight. The base frame 26, which has been bent as shown in FIG.
A block-shaped needle bar stand 27 is vertically fixed to this basic frame 26, and a support frame 29 is attached to this needle bar stand 27 via a support shaft 28, and is horizontally rotatable at its protrusions 29a and 29b. It is supported by an insertion shaft. A needle bar 30 is inserted through the support frame 29 so as to be able to reciprocate up and down, and this needle bar 30 is connected to a needle bar crank 31 via a needle bar holder (not shown).
It is designed to be reciprocated up and down by a sewing machine main shaft 32 shown in FIG.

A sewing needle 34 having an eye hole 33 for threading the sewing thread is detachably attached to the lower end of the needle bar 30 via a needle holder 35. Further, a connecting frame 36 shown in FIGS. 4 and 5 is pivotally attached to the support frame 29, and by reciprocating the connecting frame 36 in the horizontal direction by a pulse motor (not shown), the needle bar 30 is moved in a zigzag manner. 6(
Mainly regarding the threading device) A threading device 38 that functions to capture the sewing thread 37 supplied near the eye hole 33 of the sewing needle 34 by a threading hook and pass it through the eye hole 33 is attached to the support frame 29. are arranged relationally. That is, as can be seen from FIGS. 2, 4, and 6, along the vertical sides of the support frame 29,
A threading guide plate 39 formed in an elongated U-shape is provided,
The guide plate 39, which is pivotally supported by the support frame 29, has a vertical slit 39 with a predetermined width so that the upper and lower end edges of the guide plate 39 can be rotated by a predetermined angle around the needle bar 30.
a is formed. In addition, a threading shaft 40 is inserted into an end extending horizontally from the lower part of the guide plate 39 so as to be movable in the axial direction and rotatable around the axis, and is held by a bifurcated member 41 fixed to the needle n30. The threading shaft 40 is slidably and stably held.

A resin-made moving member 42 (hereinafter referred to as "threading slider") having the shape shown in FIGS. 9 and 11 is disposed vertically inside the threading guide plate 39 (on the support frame 29 side), two bolts 42a inserted into the slit 39a,
42a, and is movable up and down along the slit 39a.

The top of the threading shaft 40 is fitted into the upper end of the slider 42 . Further, slots 43 are transparently provided in the slider 42 in a predetermined pattern.
A guide pin 44 horizontally fixed to the threading shaft 40 is inserted therein, and a compression spring 45 shown in FIG.
0 is always elastically biased downward. Also, between the thread guiding slider 42 and the protruding piece 39a of the guide plate 39,
Spring means 46 consisting of a tension spring shown in FIGS. 6 and 7
is engaged, and the slider 42 is constantly lifted and biased upward by its elasticity. The side wall of the threading slider 42 is provided with a guide member 52 (described later) with which an engaging piece 51 provided on a linking member 50 (described later) engages in a relational manner.

A cylindrical member 47 is inserted into the lower end of the threading shaft 40, as shown in the enlarged plan view of FIG.

A threading hook 48 curved from this member 47 and a protective body 49.4 consisting of two tongue pieces sandwiching this hook 48.
9 extend horizontally. The dimensions of this threading hook 48 are set shorter than the dimensions of the protector 49, and when the hook 48 is inserted into the eyelet 33 of the sewing needle 34 by the operation of the threader 38, both the protectors 49 It protrudes forward from the hook while holding the sewing needle 34 therebetween. The basic structure and operation of this threading device 38 are described in detail in Japanese Utility Model Application Publication No. 54-43878 filed by the present applicant.

(Regarding the thread supply path of the sewing machine) Next, on the side of the upper arm 24 facing the sewing machine operator, there is a thread guide member 53 that smoothly guides the sewing thread 37 pulled out from the thread supply source 61, as shown in FIG. , thread tension device 5
4, a guide wall 81, a guide body 56, a thread take-up 57, a thread transfer member 58 and a thread holding member 59, which will be described in detail later, are arranged in this order in the left direction. As shown in the plan view of FIG. 3, the thread guide member 53. The thread insertion portion 54a of the thread tension device 54 and the guide wall 81 form a linear thread supply path extending in the longitudinal direction of the upper arm 24.

Also, the thread guide member 5 guides the sewing thread 37 to the thread tension device 54.
3 to the locking end 5 of the yarn transfer member 58 waiting in a predetermined position.
The thread insertion part 54a of the thread tension device 54 is set to be oriented in the arrangement direction toward 8a (FIG. 4),
A guide wall 81 that guides the sewing thread 37 into the thread insertion portion 54a
are formed to extend in the arrangement direction of the various members and above the thread insertion member 54a, respectively.

A required recess 60 is formed at the top of the upper arm 24, and the lower half of a thread spool 61, which serves as a thread supply source, is accommodated in this recess. The support frame 62 through which the thread spool 61 is inserted and supported is mounted so as to be biased by a required angle so as to be oriented toward the linear thread supply path.

Furthermore, as shown in FIGS. 3 and 5, the top of the upper arm 24 is provided with a balance 57. A rectangular upper opening 63 is provided to allow the thread transfer member 58 and thread holding member 59 to protrude slightly. Further, as shown in FIGS. 6 and 9, the lower surface of the upper arm 24 has a sewing thread 37. A lower opening 64 is provided to allow passage of a portion of the yarn holding member 59 and yarn transfer member 58. Note that the balance 57 is
Since the upper arm 24 reciprocates up and down in an arc shape, the front part of the arm 24 does not have a slit for passing the thread take-up, as seen in conventional sewing machines, as shown in FIG. It has a plain appearance.

Further, as shown in FIGS. 9 to 11, a defining means 91 is provided in the sewing machine frame 21 for defining an upper and lower space in front of the needle bar 3o in which a thread holding member 59 (to be described later) moves. This defining means 91, as shown in FIG.
A thread tangle prevention plate 92 extends a sufficient distance to cover the horizontal swing range of the needle bar 30 and is fixed to the sewing machine frame 21 in front of the needle bar 30, and an upper part as shown in FIG. It consists of a space defining frame 93 that protrudes forward inside the arm 24. and the thread tangle prevention plate 9
2, the eyelet 33 of the sewing needle 34 is opened by lowering the thread holding member 59.
The suture thread 37 pulled out to the vicinity of is smoothly guided downward, and the thread is prevented from becoming entangled with other members.

(Mainly Regarding the Thread Holding Member) As shown in FIGS. 2 and 6 to 12, a thread holding member 59 that releasably holds the sewing thread 37 is disposed in the upper arm 24, and the operating body 65 By this operation, the thread holding member 59 can be moved from its standby position to the eye position of the sewing needle 34. That is, a slit 66 of a predetermined length is vertically bored on the left side surface of the upper arm 24 shown in FIG. 2, and the protruding piece 50a of the linking member 50 having the shape shown in FIG. 11 faces into this slit 66. . A single operating body 65, which is a rectangular knob member located outside the sewing machine frame 21, is fixed to the protruding piece 50a. Further, a holding frame 67 having a shape shown in FIG. 6 is arranged and fixed inside the upper arm 24.
End portions 67 a that protrude horizontally from 7 and are vertically opposed to each other;
67b, a guide shaft 68 is vertically inserted and fixed, and the linking member 50 is inserted through this guide shaft 68 so as to be able to move up and down (FIGS. 2 and 11).

Note that the linking member 5o and the operating body 65 are normally lifted and biased to a position above the slit 66, and an elastic body 69 is used for this purpose. A member 71 is pivotally supported via a fixed shaft 70, and a tongue piece 71 formed on this actuating member 71
a and the inner top surface of the upper arm 24, as shown in FIG.

By tensioning the tension spring 69, the linking member 50 and the operating body 65 are biased in the lifting direction.

As clearly shown in FIGS. 6 and 11, linking member S
An actuating member 71 having the shape shown in the figure is pivotally attached to a portion of O located rearward of the needle bar 30 via a fixed shaft 70. Under the elastic action of the tension spring 69, the actuating member 71 is constantly lifted and biased together with the linking member 5o to a predetermined standby position shown in FIG. The actuating member 71 is connected to the fixed shaft 7
0 within a required angular range, and holds the thread holding member 59 (described later) within a plane containing the needle bar 30 (FIGS. 5 to 5).
(Fig. 9).

One free end of the actuating member 71 is arranged as shown in FIG.
A thread holding member 59 (described later with reference to FIGS. 10 and 12), which is bent into a U-shape and holds the sewing thread 37 in a releasable manner, is rotatable via a shaft pin 73. It is set in. Further, at the opposite end of the actuating member 71, as shown in FIG.
Crotch-shaped followers 7lb and 71c are integrally formed. The dimensions of the follower 71c are set such that it can come into contact with a cam surface 74a shown by a broken line of the control cam 74 shown in FIG. 7 when a predetermined tilt angle is reached. This control cam 74 is disposed within the upper arm 24 along the operating direction of the operating body 65, and controls the rotational attitude of the operating member 71 in accordance with the operating position that changes as the operating body 65 moves up and down. It functions as expected. Also, the cam surface 74a
As will be explained later with reference to FIGS. 9 to 12, a thread holding member 59 is moved to a position close to the sewing needle 34, and the thread holding member 59 is moved up and down around the eye hole 33. A linear holding cam surface 74b is also formed that holds the rotational posture of the actuating member 71 constant via the follower 71c while the actuating member 71 is located within a predetermined range of directions.

As shown in FIG. 7, the follower 71b comes into contact with a protruding cam surface 74c provided on the control cam 74 when the actuating member 71 is lowered a predetermined distance from its standby position, and the actuating member 71b The function is to rotate the member 71 clockwise relative to the linking member 50. Sunarichi guide 1i? By pushing down the operating body 65 connected to the linking member 5o outside the sewing machine frame, the linking member 5o inserted through the linking member 5o is lowered by a predetermined distance together with the operating member 71 against the elasticity of the elastic member 69. As shown in FIG. 7, the follower 71b of the actuating member 71 contacts and moves along the protruding cam surface 74c of the control cam 74, thereby
The actuating member 71 starts rotating clockwise about the fixed shaft 70 with respect to the linking member 50 at a required timing.

Next, as shown in FIGS. 10 to 12, the thread holding member 59 is rotatably attached to the U-shaped free end of the operating member 71 via a shaft pin 73. There is. This thread holding member 59 is made of hard resin,
It is provided with a thread holding end portion that releasably holds the sewing thread 37 at an appropriate location, and is movable in the swinging direction of the needle bar 30 relative to the actuating member 71. That is, the thread holding end portion that releasably holds the sewing thread 37 has a protruding piece 59a formed integrally with the thread holding member 59, and is fixed to the thread holding member 59 and protrudes slightly forward of the protruding piece 59a. It is composed of a metal elastic piece 55. The thread holding end portion consisting of the projecting piece 59a and the metal elastic piece 55 is inserted into the eye hole 33 of the sewing needle 34 while holding the sewing thread 37 as the operating member 71 rotates, as shown in FIG. The sewing thread 37 is brought to the position of the threading hook 48.

At the pivot point between the thread holding member 59 and the actuating member 71, compression springs 80, 80 are attached to shaft pins 73 extending on both sides with the thread holding member 59 in between, as shown in FIG. As a result, the thread holding member 59 is elastically biased on the shaft pin 73 so as to be able to move left and right in the direction in which the needle bar 30 swings.

Note that in the zigzag sewing machine, the needle bar 3o swings within a predetermined angular range, so the stopping position of the needle bar is indefinite. Therefore, even if the thread holding member 59 is lowered under the pressure operation of the operating body 65, the thread holding end holding the sewing thread 37 does not necessarily reach the stopping position of the needle bar 30 and the sewing needle 34. Then, attach the thread holding end holding the sewing thread 37 to the sewing needle 34.
As shown in FIGS. 11 and 8, the guide member 52, which is engageable with the thread holding member 59, is operated in conjunction with the operation of the operating body 65 for the purpose of guiding the thread to a position close to the eye hole 33 of the thread holding member 59. It is fixed to a threading slider 42 that moves up and down. This guide member 52 is made of a plate material having the shape shown in FIG.
The upper part thereof is formed as a narrow part 52a, and a wide part 52b is integrally formed below the narrow part 52a. A slit 52c of a predetermined length is formed in the narrow portion 52a, and by inserting the engagement piece 51 of the linking member 5o into the slit, a threading operation to be described later is executed.

Further, as shown in FIG. 6, below the guide member 52, a wide portion 52b that slightly protrudes to the right (toward the sewing machine operator) from the narrow portion 52a is attached to the back surface of the thread holding member 59 as shown in FIG. The receptacle is inserted into the bored groove 59b and guided downward. At this time, the cross section of the groove 59b is formed in a V-shape that expands outward, and the thread holding member 59 is movable in the swinging direction of the needle bar 30 with respect to the operating member 71. Therefore, as the thread holding member 59 descends, the groove 59b is smoothly introduced into the wide portion 52b. The guide member 52 including the wide portion 52b is connected to the needle bar 3.
The threading slider 42 is arranged in relation to the support frame 29 of 0.
Since it is attached to the groove 59b of the thread holding member 59,
is inserted into the wide portion 52b, so that the thread holding end of the sewing thread 37 is securely inserted into the needle bar 30 (and the eye hole 3 of the sewing needle 34).
3) will be located at the stop position.

(About the yarn transfer member) Next, as shown in FIGS. 2 and 5, the straight guide surface 5
A guide body 56 having a guide member 6a is disposed and fixed vertically within the sewing machine frame 21 close to the movement trajectory of the thread take-up lever 57.

This guide body 56 guides a yarn transfer member 58, which will be described later, up and down, and a known yarn take-up spring body 82 is fixed at a predetermined position located on the right side (in FIG. 2) and below. has been done.

The thread transfer member 58 is biased by the operating body 65 and guided by the guide body 56 to move down in a timely manner in order to transfer the sewing thread 37 held by the thread take-up lever 57 to the thread take-up spring body 82 of the guide body 56. It is configured like this. That is, as shown in FIGS. 2 and 11, the yarn transfer member 58 is configured as a base body 58b that is bent into a U-shape as a whole,
One free end thereof is provided with a locking end 58a having the shape shown in the figure, thereby locking the sewing thread 37 held by the thread take-up 57. Also, the base body 58b in the thread transfer member 58
The other end 58c is fixed to the linking member 5o via a screw 75. Therefore, this thread transfer member 58
It moves up and down integrally with the up and down movements of the linking member 50 connected to the linking member 50. In this case, the range of linear vertical movement of the locking end 58a of the thread transfer member 58 is
It extends from the standby position shown in the figure to a position below the thread take-up spring body 82 shown in FIG.

The thread transfer member 58 is elastically biased upward by the thread holding member 59 and the lifting biasing elastic body 69 of the linking member 50 shown in FIG. 6 and described above. is located at a predetermined standby position above the uppermost position of the balance 57, as shown in FIGS. 2 and 5.

A locking end 58 provided at the upper free end of the thread transfer member 58
As can be seen from FIGS. 2 and 4, a crosses the tip of the balance 57 in its standby state, and
7 and the thread tension device 54.

(About the thread take-up) As shown in FIG. 5, the thread thread take-up 57 that pulls up the thread 37 is curved at its tip to form a thread holding hole 57a. An elastic tongue piece 87 is provided for prevention. This thread take-up 57 is connected to a link (not shown) that is pivotally supported on a shaft 88 on the base frame 26 in the sewing machine frame 21, and also connects to the needle bar crank 31.
This is a well-known link-type device that is connected to a motor to provide a predetermined reciprocating motion. Note that when the balance 57 reaches the uppermost position, the balance 57 slightly extends outward from the upper opening 63 provided in the upper arm 24.

(Connection control means for energizing the threading device) The aforementioned threading device 38 is provided with a connection control means for operating the device with a predetermined time delay by the lowering movement of the linking member 50. That is, the linking member 50 is provided with an engaging piece 51 having a shape as shown in FIGS. It is inserted into the slit 52c and can be moved up and down through the slit. In this case, the length of the slit 52c is such that the length of the slit 52c corresponds to the distance that the operating body 65 including the engaging piece 51 inserted therein moves from the position shown in FIG. 6 to the position shown in FIG. It is set. Then, while the linking member 50 is descending with its engagement piece 51 facing the slit 52c, it urges the thread holding member 59 and the thread transporting member 58.
At this stage, the threading device 38 is not yet energized.

However, as shown in FIG.
2c and abuts against the lower end of the slit, the guide member 52 and the threading slider 42 to which it is attached are urged downward, thereby starting the threading operation. That is, the threading operation in the threading device 1138 is performed by the thread holding member 59 and the thread transporting member 58.
The operation is started with a predetermined time delay.

When the threading slider 42 is urged downward together with the guide member 52 in this way, the slider moves as shown in FIGS. 13(a) and 13(b), as will be described later regarding the operation. The threading shaft 40 equipped with the threading hook 48 is lowered by a required distance α, and the threading hook 48 is attached to the sewing needle 3.
It is made to arrive at the same position in the vertical direction as the eye hole 33 of No. 4. At this point, the guide pin 44 inserted into the slot 43 of the slider 42 comes into contact with the position regulating piece 72 provided at the fixed position, and prevents the threading shaft 4o provided with the threading hook 48 from further lowering. However, since the threading slider 42 is urged downward by the engaging piece 51 via the guide member 52, the threading slider 42 is urged downward by the engaging piece 51 through the guide member 52, and therefore, under the cooperation of the guide pin 44 and the slot 43, as shown in FIG. Threading shaft 4o
As a result, the threading hook 48 is attached to the sewing needle 3.
4 through the eye hole 33. In this case, the pattern of the slots 43 formed in the threading slider 42 is
If the holes are made in a zigzag pattern as shown in the figure, the rotation direction of the threading shaft 40 will be reversed as the threading slider 42 descends, and the threading hook 4 will move as shown in FIG. 13(d).
8 is pulled out from the eye hole 33 of the sewing needle 34.

That is, the connection control member is made up of an engaging piece 51 provided on the linking member 50 and a slit 52c formed in the guide member 52, and the threading hook 48 is inserted into the eye hole 33 by operating the operating body 65. In addition, it functions to connect the threading hook 48 and the operating body 65 in the entire section of the operating area or a part thereof, which is a predetermined operating position until the thread holding member 59 reaches the eye hole 33. It is.

(Other Ancillary Structures) As shown in FIGS. 2 and 6, the actuating member 71, which has the thread holding member 59 at its free end, faces the upper opening 63 of the upper arm 24 and waits for threading. However, during this standby period, the posture of the thread holding end of the thread holding member 59 is corrected so that it is always oriented toward the operator in front of the sewing machine. That is, as shown in FIG. 6, the follower 71c of the actuating member 71 is held in position by contacting the protruding cam surface 74c of the control cam 74, and in this state, the thread holding member 59 is stopped at the standby position. The thread holding end is directed toward the operator in front of the sewing machine. This facilitates threading by the operator.

(Operating procedure of the sewing machine according to the embodiment) Next, the operating procedure of the sewing machine according to the embodiment configured as described above will be explained. To sew with this sewing machine,
Prior to this, it is necessary to thread the thread. In the standby state before the threading operation, as shown in FIGS. 1, 5, and 6, the thread transfer member 58 and the thread holding member 59 are urged upward by the elastic member 69, and the thread transfer member 58 and the thread holding member 59 are urged upwardly by the elastic member 69, and are pushed upwardly from the top of the arm. It slightly protrudes from the opening 63 and stops. As described above, the thread holding member 59 is waiting for threading with its thread holding end facing toward the operator in front of the sewing machine.

Further, as shown in FIG. 5, the locking end 58a of the thread transfer member 58 is waiting at a predetermined position above the thread take-up 57, which is stopped at the uppermost position.

In this state, the needle thread 37 is pulled out from the thread spool 61 (thread supply source) stored in the recess 60 provided at the top of the upper arm 24, and is passed through the thread guide member 53 and the thread tension device 54. , the tongue piece 87 is inserted into the thread holding hole 57a of the thread take-up lever 57 protruding from the upper opening 63 of the sewing machine head against the elasticity of the tongue piece 87.

At this time, the locking portion 58 of the thread tension device 54 and the thread transfer member 58
As described above, the guide wall 81 interposed between the thread guide member 53 and the guide wall 81 is formed to extend in the arrangement direction from the thread guide member 53 toward the locking portion 58a in the standby position. In the thread supply path leading to the wall 81, the sewing thread 37 is naturally guided into the thread insertion portion 54a of the thread tension device 54. The sewing thread 37 is further pulled out to the left and is fitted between the thread holding end of the thread holding member 59, that is, the protruding piece 59a and the elastic piece 55, and is held elastically.

After completing this manual work, the first worker operates the operating body 65 located on the left side of the upper arm 24 with his or her fingers and pushes it down all at once, thereby threading the thread take-up spring body 82 and threading the sewing needle 34. Threading work up to the eye hole 33 can be automatically accomplished. That is, when the operating body 65 is pushed down, the linking member 50 provided on the operating body 65 starts to descend while being guided by the guide shaft 68 and the slit 66. Therefore, the thread transfer member 58 and the thread holding member 59 are lowered together with the linking member 50, but due to the cam mechanism described later, the thread holding member 59 is lower than the thread transport member 58.
descend faster than For example, the thread holding member 59 is provided at one free end, and the other end is connected to the linking member 59 via the fixed shaft 70.
The actuating member 71, which is pivoted at 0, rotates clockwise from the standby position about the shaft 7o under the cam action caused by the engagement of the follower 71c with the protruding cam surface 74c provided on the control cam 74. start the movement. Accordingly, the sewing thread 37 held between the thread holding ends (55, 59a) of the thread holding member 59 is pulled out downward through the thread holding hole 57a of the thread take-up lever 57. By utilizing the turning movement caused by the cam action in this way, the descending speed of the thread holding member 59 is reduced by the descending speed of the thread feeding member 58 (that is, the descending speed of the linking member 50), as shown in FIGS. 7 and 8. speed).

The thread diameter feeding member 58 fixed to the linking member 50 is independent of the action of the thread holding member 59 that largely pulls out the sewing thread 37 downward.
is lowered at a lower speed than the lowering speed of the thread holding member 59. That is, the locking portion 58a of the thread feeding member 58, which was located above the thread take-up lever 57 during standby, locks the sewing thread 37 on both sides of the thread holding hole 57a of the thread take-up lever 57, and then straightens the adjacent guide body 56. The thread take-up spring body 82 descends straightly along the guide surface 56a, as shown in FIG.
Guide the sewing thread 37 until the end. After that, when the pressing force on the operating body 65 is released, the return elasticity of the elastic body 69 also causes the thread feeding member 58 fixed to the operating body 65 and the linking member 50 to rise. A curved indentation 56b is formed at the end of the guide surface 56a.
, and is finally engaged with the thread take-up spring body 82.

Further, as shown in FIG. 6, the follower 71c of the actuating member 71 that has started its rotation descends following the vertical cam surface of the control cam 74, and then rides on the inclined cam surface 74b. descend while following the As a result, the actuating member 71 of the thread holding member 59 rotates while being controlled by this cam, and is in the state shown in FIG. 8(a). When the thread diameter feeding member 58 has rotated to a predetermined angle in this manner, the connection control means for urging the threading device 38 described above, that is, the engagement piece 51 and the lower end of the slit 52c start engaging. As a result, the threading slider 42 to which the guide member 52 is fixed descends together with the threading shaft 40, and as the operating body 65 descends, the state shifts from the state shown in FIG. 13(a) to the state shown in FIG. 13(b). During this time, the threading hook 48 is lowered by the required distance α. Then, the threading hook 48 provided at the lower end of the threading shaft 40 is brought to the same position as the eye hole 33 of the sewing needle 34 in the vertical direction. At this time, the guide pin 44, which is horizontally fixed to the threading shaft 40 and extends through the slot 43 of the threading slider 42, comes into contact with the position regulating piece 72 provided at the fixed position, and the threading Further lowering of the threading shaft 40 with the hook 48 is prevented. However, since the threading slider 42 is urged downward by the engaging piece 51 via the guide member 52, the threading slider 42 is urged downward by the engaging piece 51 through the guide member 52, so that the threading slider 42 is pushed downwardly by the guide pin 44 and the slot 43 as shown in FIG. 13(C). As a result, the threading shaft 48 is rotated 4 degrees as shown in FIG.
4 through the eye hole 33.

When the threading hook 48 is inserted into the eye hole 33 and is waiting for threading, as shown in FIG.
The thread holding member 59 holding the sewing thread 37 further descends and reaches a position slightly above the threading hook 48. Next, when the follower 71c of the operating member 71 rides on the holding cam surface 74b of the control cam 74, the thread holding member 59 attached to the free end of the operating member 71 descends while being held in that position. The sewing thread 37 held at the thread holding end is pressed from above onto the threading hook 48 inserted through the eye hole 33, as shown in FIG. At this time, the pattern of the slots 43 in the threading slider 42 is a zigzag pattern as shown in the figure.

As the threading slider 42 to which the guide member 52 is attached descends, the rotational direction of the threading shaft 40 is controlled to be reversed. Therefore, if the threading hook 48 is controlled to retreat from the eye hole 33 of the sewing needle 34 at the timing when the sewing thread 37 is pressed against the threading hook 48 as shown in FIG. 48 hooks the sewing thread 37 when retreating from the eye hole 33, and the sewing thread 37
threading is accomplished by pulling it out from the

With the thread holding member 59 transporting the sewing thread 37 to the eye hole 33 of the sewing needle 34 and pressing it against the threading hook 48, the threading shaft 40 is reversed, so that the threading hook 48 is moved to its tip. With sewing thread 37 hooked, open eye hole 3.
3, and the sewing thread 37 is thereby inserted into the eye hole 33 of the sewing needle 34. Therefore, the sewing thread 37 which becomes the upper thread is
The thread guide member 53 and the thread insertion portion 5 of the thread tension device 54 described above
4a, the eye 33 of the sewing needle 34 passes through the thread take-up spring body 82 provided on the guide body 56 and the thread holding hole 57a of the thread take-up 57.
This means that all the threading and threading operations for machine sewing are completed.

After this series of threading is completed, when the manual pressing force on the operating body 65 is released, the linking member 50 is moved through the slit 66 provided on the left side of the arm and the guide shaft by the return elasticity of the elastic body 69. The actuating member 71 of the thread holding member 59, which is raised to a predetermined standby position while being guided by the connecting member 68 and pivoted to the linking member 50 via the fixed shaft 70, also follows the cam surface of the control cam 74 with its follower 71c. It rotates and rises, and finally stops with its follower 71c in stable contact with the top 74c, as shown in FIG. Further, the thread transfer member 58 fixed to the linking member 50 via the base body 58b also returns to its original position and waits for threading onto the primary thread take-up spring body 82.

Further, the threading slider 42 also rises under the returning action of the spring 46, and at this time, the threading hook 48 and the threading shaft 40 are engaged with the guide pin 44 and the slot 43 as shown in FIG. 13(d). - Perform the previous operation in the reverse order as shown in Fig. 13(a) to return to the original position.

In this embodiment, the sewing thread 37 is inserted in advance into the thread holding hole 57a of the thread take-up lever 57 before the thread hooking operation, but instead of this, the tip of the thread take-up is bent into a hook shape, and the thread hook is sometimes The tensioned sewing thread may be automatically captured by the hook when the sewing machine starts operating. Further, in this embodiment, the threading hook 48 is configured to operate in conjunction with the movement of the operating body 65, but the threading hook 48 may be operated separately from the operating body 65. Of course.

Effects of the Embodiment According to the zigzag sewing machine capable of automatically threading the thread according to the embodiment of the present invention, the thread can be threaded by simply pressing down the operating body 65 provided on the outside of the upper arm 24 of the sewing machine so as to be able to move up and down. The sewing thread 37 supplied from the piece 61 is hung on the thread take-up spring body 82, the sewing thread 37 is transferred to the eye hole 33 of the sewing needle 34, and the thread threading hook 48, which is waiting after being inserted into the eye hole 33, picks up this sewing thread. 37 and retreating, threading and threading in a predetermined order, which conventionally required troublesome effort, can be easily accomplished.

Moreover, in the zigzag sewing machine, since the needle bar 30 swings in the horizontal direction, the stopping position of the sewing needle 34 is also unstable, as described above, but in the present invention, the thread holding member 59 holding the sewing thread 37 is The groove 59b formed on the back of the needle bar 3
The needle bar is constantly biased by an elastic body 80 in the swinging direction of the needle bar so as to be positioned correspondingly to the center swinging position in the swingable range of o.

Therefore, when the thread holding member 59 descends, the groove 59
b is a guide member 52 arranged in relation to the threading device 38;
The thread holding member 59 is engaged with the wide portion 52b of the thread holding member 59.
is moved in the swinging direction of the needle bar 30 to open the eye hole 33 of the sewing needle 34.
Therefore, the suture thread 37 is appropriately captured by the threading device 38.

In addition, the linking member 50 that operates the thread transfer member 58 and the thread holding member 59 in conjunction with each other is configured to cause the two members to start operating at different times, thereby preventing sudden withdrawal of sewing thread from the thread supply source. Therefore, the sewing thread 37 can be reliably transferred to the eye hole 33 of the sewing needle 34 via the thread take-up spring body 82. Moreover, the thread transfer member 58 and the thread holding member 59
and a linking member 50 that operates these two members in a linked manner.
Since it has a simple configuration, it is easy to manufacture and can reduce manufacturing costs.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, according to the automatic threading machine of the present invention, the sewing machine threading operation, which conventionally required multiple operations, can be performed by a single moving operation of the operating body.
The sewing thread pulled out from the thread supply source can be transferred to a position near the eye of the sewing needle where it can be reliably captured by the threading device, and the threading operation can be easily accomplished. In addition, in a zigzag sewing machine, the needle bar moves laterally and then stops, so the stopping position of the needle bar is not constant.
When the thread holding member holding the suture thread descends, the end face of its recess engages with the guide member and moves the thread holding member in the swinging direction of the needle bar until it reaches the eye hole position. This ensures that the suture is captured by the threading device.

[Brief explanation of drawings]

The drawings show a preferred embodiment of a zigzag sewing machine incorporating an automatic threading mechanism according to the present invention, and FIG. 1 is a front view showing the overall external configuration of the sewing machine according to the preferred embodiment; Fig. 2 is a partially cutaway front view showing the main parts of the sewing machine shown in Fig. 1, Fig. 3 is a plan view of the sewing machine shown in Fig. 1, and Fig. 4
The figure is a partially cutaway plan view showing the main parts of the sewing machine shown in Figure 3;
5 is a cross-sectional view taken along the line 5-5 in FIG. 2, FIG. 6 is a cross-sectional view taken along the line 6-6 in FIG.
Fig. b) and Fig. 9 are schematic operation diagrams illustrating over time the state in which the thread holding member, the thread transporting member, and the threading device operate with a predetermined time difference via the linking member by pressing down of the operating body, FIG. 8(b) is a Z arrow view of FIG. 8(a),
FIG. 10 shows a state in which the thread holding member has reached a position near the eye of the sewing needle and has brought the sewing thread into contact with the threading hook that has been inserted through the eye and is waiting to be caught; The figure is an exploded configuration diagram of the main part of the present invention, FIG. 12 is an explanatory diagram showing the state in which the thread holding member is guided by the guide member, and FIG. 13(a)
Figures 13(d) to 13(d) are explanatory diagrams illustrating over time the state in which the threading hook is inserted into the eye of the sewing needle, then retreated and pulled out from the eye. 29... Support frame 3o... Needle bar 33... Eye hole 34... Sewing needle 37... Sewing thread 38.
... Threading device 52 ... Guide member 55, 59 a
...Thread holding end 59...Thread holding member 65...Operation body 71...Operating member FIG, 5 FIG, 6 FIG, 7 FIG, 12 (a) 52a FIG, 8 FIG, 9 RiL FIG. 10

Claims (1)

[Claims] 1. Needle bar (3
A sewing needle (34) is attached to the lower end of the sewing needle (34) and has an eye hole (33) through which the sewing thread (37) is inserted.
a threading device (
38), a thread holding end (55,
59a); supporting the thread holding member (59) so that the thread holding end portion (55, 59a) can move in the swinging direction of the needle bar (30); an actuating member (71) operable to move the holding member (59) from a predetermined position to at least the eye hole (33) of the sewing needle (34); and an actuating member (71) operable to move the holding member (59) to actuate the actuating member (71). An operating body (65) and a support frame (29) that swingably supports the needle bar (30).
or is provided on a member operatively connected to the support frame (29), and the thread holding end (55, 59a) is connected to the sewing needle (3).
a guide member (52) that is engageable with the thread holding member (59) to guide the thread to a position close to the eye hole (33) of item 4);
A zigzag sewing machine with automatic threading. 2. The guide member (52) is a moving member (71) that moves up and down in relation to the operation of the operating body (65) in the threading device (38) attached to the support frame (29). )
Claim 1 characterized in that it is provided in
Zigzag sewing machine capable of automatic threading as described in Section 1.