JP2001170387A - Wiper device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper device for a sewing machine constituted not to hinder handling of a sewn material even when a seamed part passing a presser foot and further moving in a forward feed direction is wavy. SOLUTION: This wiper device for the sewing machine is provided for pulling out a needle thread cut after the completion of sewing, from a sewn material. The wiper device is provided with a link mechanism 120 fitted to the front part of an arm 5 of the sewing machine 4 and swinging almost in the feed direction of a wiper member, and a driving means 110 for driving the link mechanism 120. In this constitution, a fulcrum 146c of the lower end part of a sliding arm 130 to which the wiper member is fixed, exists above a lower face 6a of the front end face part of the arm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wiper device for a sewing machine.

[0002]

2. Description of the Related Art Conventionally, a sewing machine provided with a thread cutting device below a needle plate is known. In such a sewing machine, when a needle thread is cut by a thread cutting device after completion of sewing, the sewing machine is cut off. The needle thread is in a state of being connected between the needle and the workpiece. In order to pull out the cut end of this needle thread from the work,
Conventionally, a wiper device has been provided.

Referring to FIGS. 9 and 10, a wiper device 50 is attached to a front portion of an arm 5 of a sewing machine 4.
A needle thread cutting device (not shown) is provided below a needle plate (not shown) disposed on the upper surface 2 of the sewing machine bed. When the needle bar 8 is stopped at an upper position after completion of sewing, a needle thread such as a shuttle is provided. The needle thread 18 captured by the capturing means (not shown) is cut by the needle thread cutting device. As a result, the needle thread 18 continuing from the needle 16 to the cut end remains in a state of penetrating the sewing product 12.

The wiper device 50 includes a plunger type solenoid 52, a link mechanism 54 driven by the solenoid 52, a wiper member 56 fixed to the lower end of the link mechanism 54, and a link mechanism 54 driven by the solenoid 52. And a spring (not shown) for returning to the position.

The distal end 56a of the wiper member 56 has a hook shape that allows the needle thread 18 to pass without catching when the wiper member 56 moves forward and to catch the needle thread when moving backward. When the solenoid 52 is turned on, the wiper member 56 operated via the link mechanism 54 descends, and its tip 56a
Passes through the needle thread 18. Next, the solenoid 52 is turned off.
Then, the link mechanism 54 is returned to the initial position by the spring, but the tip 56a of the wiper member 56 catches the needle thread 18 and pulls the cut end of the needle thread 18 from the sewing product 12 on the way.

[0006] In addition to the above-described solenoid 52 as a driving mechanism for the link mechanism, there is also known a mechanism for driving the link mechanism by a rotary solenoid as disclosed in Japanese Utility Model Publication No. 61-7664.

[0007]

However, in the above-described conventional wiper device, the link mechanism 54 is located below the jaw 7 of the arm 5 and the link lower end (fulcrum) 55 for fixing the wiper member 56 is provided on the sewing machine 4. Lower end 6a of the surface portion 6
It is located below.

On the other hand, when the sewing operation is performed in the normal feed direction A, the sewing end portion 12a of the sewing product 12 located in front of the presser foot 14 may have a waveform as shown in FIG.
For this reason, in the case of the conventional wiper device in which the fulcrum 55 is located below the lower surface portion 6a as described above, the link mechanism 54 becomes an obstacle, and the sewn product 12 is caught by the link mechanism 54, and the sewn product 12 is damaged. , The worker is sewing 1
2 will hinder handling.

Further, in the structure of the conventional wiper device, a wiper member 56 is attached to a lower end of a link mechanism 54 composed of a number of links, and play is generated at each connection portion (pin portion) of the link. Since they are combined and transmitted to the wiper member 56, the wiper member 56 has a considerable play. For this reason, the position of the tip 56a of the wiper member 56 may be displaced and the needle thread 18 may not be captured.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a wiper device for a sewing machine in which a sewn product is reliably sent forward and does not hinder the handling of the sewn product 12. Is to do.

It is another object of the present invention to provide a wiper device of a sewing machine which can securely capture a needle thread while reducing play of the wiper.

[0012]

According to the present invention, there is provided a link mechanism which is mounted near a front end of an arm portion of a sewing machine and swings a wiper member along a feed direction. A driving means for driving the mechanism, wherein the lower end of the link mechanism is located above the lower surface of the front end of the arm portion. Features. Further, the link mechanism has a slide arm for fixing the wiper member, and a lower fulcrum of the slide arm is located above a lower surface of a front end of the arm portion.

With this configuration, the entire mechanism is located above the lower surface of the front surface of the arm, so that the cloth can be reliably transferred without damaging the sewing product and does not hinder the sewing operation. .

[0014] Preferably, the link mechanism has a slide arm for fixing the wiper member, and a lower end fulcrum of the slide arm is configured to be able to slide and slide the slide arm in a vertical direction. . In this case, the slide arm is supported by the surface, and the occurrence of backlash is greatly suppressed.

Further, the upper end of the slide arm is connected to the slide arm via a connection shaft, the connection shaft is an eccentric shaft, and the movement trajectory of the tip of the wiper member is variable. The movement trajectory can be made variable.

Further, according to the present invention, by moving the initial position of the upper end of the slide arm, it is possible to switch the wiper threading method between the pulling-out method and the pushing-out method.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The arrow A in FIG. 1 indicates the front in the cloth feeding direction, the arrow B indicates the rear in the cloth feeding direction, and the arrow C in FIG.
Indicates the front of the sewing machine (face plate side), and D indicates the back of the sewing machine (pulley side).

At the front C end of the sewing machine of the arm portion 5, a needle bar 8, which is fixed at a lower end thereof and has a needle 16 penetrating the sewing product 12 and moves up and down, and a presser 14 for pressing the sewing product 12, are provided. A wiper device 1 is provided on the front end face in the cloth feeding direction.
00 is attached.

A needle thread cutting device (not shown) is provided below a needle plate (not shown) provided on the bed upper surface 2 so as to face the presser foot 4. When the needle bar 8 stops at the raised position at the end of sewing, the needle thread cutting device cuts the needle thread 18 captured by a needle thread capturing body (not shown) such as a shuttle below the sewing machine bed 2. As a result, the needle thread 18 on the side connected to the needle 16 is left in a state of penetrating the sewing product 12 as shown in FIG.

The wiper device 100 includes a base 102 fixed to the arm 5 of the sewing machine 4 and a plunger 112 fixed to the base 102 and sucked upward when turned on.
, A link mechanism 120 operated by the solenoid 110, a wiper member 160 fixed to a lower end of the link mechanism 120, and a spring 144 for returning the link mechanism 120.

The base 102 has an L-shaped cross section due to an end face 102a along the direction of arrow CD and an end face 102b along the direction of arrow AB. Long hole 10 vertically long
The stopper 106 formed with 6a is fixed to the end face 102a by screws 104, 104 passing through the elongated hole 106a.

The stopper 106 is provided with a solenoid 110
Plunger 1 in the normal state where
A cylindrical elastic body 108 is provided such that the lower end of the cylinder 12 is in contact with the elastic body 108. Note that this stopper 106 is
The engagement position between the elastic body 108 and the lower end of the plunger 112 can be adjusted in the vertical direction by changing the fixing position by the screws 104 within the longitudinal range of 06a.

As shown in FIGS. 4 and 5, the link mechanism 120 includes an L-shaped first link 122 and an L-shaped second link 12 disposed on the back side of the end face 102b of the base 102.
4, the first arm 126, and FIGS.
As shown in the drawing, a second arm 128 and a rod-shaped third arm (sliding arm) 130 are provided on the front side of the end face 102b of the base 102.

The first link 122 has a forked portion 122a formed at one end thereof, and a pin 136 fixed to the plunger 112 of the solenoid 110 is inserted through the forked portion 122a. The first link 122 is rotatably supported around a screw 132 fixed to the base 102, and the other end is rotatably connected to one end of a second link 124 by a screw 134.

The other end of the second link 124 has a screw 138
, And is rotatably connected to the tip of the first arm 126. The base end of the first arm 126 is
b, and is fixed to one end of a pin 140 rotatably penetrating therethrough. The other end of the pin 140 has an end face 1
The base end of the second arm 128 arranged on the front side of the second arm 02b is fixed via screws 129,129. Second arm 1
The tip of 28 is rotatably connected to the upper end of the third arm 130 via a pin 142.

The tension spring 14 for urging the other end of the second arm 128 upward is provided between the end face 102b and the second arm 128.
4 are provided. Second arm 128 and third arm 130
The initial position of the connection point (pin 142) with
By adjusting the angle of attachment of the second arm 128 to the pin 140 by loosening the pin 29, the angle can be adjusted.

In place of the pin 142, as shown in FIG. 2 (B), two cylindrical portions 143a, 143 which are eccentric to each other.
The second arm 128 and the third arm 130 may be connected by an eccentric pin 143 composed of 43b.

A piece 146 rotatably mounted on the end face 102b is disposed in the through-hole (sliding portion) into which the lower end of the third arm 130 is inserted so as to be slidable in the vertical direction. ) 146a are formed. The piece 146 performs a rotational movement so as to allow the sliding movement of the third arm 130. Therefore, the third arm 130 is at the center 1 of the piece 146.
A swinging motion about the fulcrum 46c becomes possible.

The lower end of the third arm 130 has a wiper member 1
60 is fixed. As is clear from FIGS. 1 and 2, the third arm 1 to which the wiper member 160 is fixed
The wiper device 100 including the fulcrum (the center 146 c of the piece 146) at the lower end of 30 is located above the lower surface 6 a of the front end surface (surface portion) 6 of the arm 5 of the sewing machine 4 except for the wiper member 160.

When viewed from above, the tip 162 of the wiper member 160 has a cloth feed forward direction (FIG. 1) as shown in FIG.
(In the direction A), a hook shape in which a needle thread catching portion 162a is formed.

Next, the operation of the wiper device having the above configuration will be described. Plunger 112, link mechanism 12
0 links 122, 124, arms 126, 128, 13
0 and the wiper member 160 are in the normal state where the solenoid is not actuated, the solid line in FIGS. 1, 3 (A) and 4 and the position (standby position, or the position shown in FIGS. 3 (A) and 5 (A)). (Initial position).

At the end of sewing, a thread trimming device (not shown) provided below the upper surface 2 of the sewing machine operates and the needle 1
6 is stopped at a position near the top dead center that has fallen out of the sewing product 12, and the solenoid 110 is operated for a predetermined time. Actuation of the solenoid 110 causes the plunger 11
2 through a pin 136 inserted into the first link 122.
Performs a swinging motion about the screw 132 as a fulcrum, and the second arm 128 is moved through the second link 124 and the first arm 126.
Also perform rocking movements.

For this reason, it moves to the position as shown by the two-dot chain line in FIG. 1, FIG. 3 (A) and FIG. 5 (B). The swing of the second arm 128 at this time causes the third arm 130 to
6 while rotating in the through hole 146a. As a result, the tip 162 of the wiper member 160 fixed to the lower end of the third arm 130 draws a motion trajectory Q as shown in FIG. 3A and swings substantially in the feed direction.

At this time, the tip 16 of the wiper member 160
2 has a shape as shown in FIG.
Since “a” is in the direction opposite to the moving direction of the tip 162 of the wiper member 160, the needle thread 18 connected between the needle 16 and the sewing product 12 is not caught and moves past the needle thread 18.

When the operation of the solenoid 110 is completed, the links 122 and 124, the arms 126, 128 and 130 and the wiper member 160 are returned to their initial positions by the action of the tension spring 144. At this time, the needle thread 18 is as shown in FIG.
As shown in FIG. 5, the tip end 162 of the wiper member 160 that is being pulled back is captured by the needle thread capturing portion 162a and pulled upward from the sewing product 12. Thus, the thread scraping operation is completed.

When the second arm 128 and the third arm 130 are connected by the eccentric pin 143 as shown in FIG. 2B, fine adjustment of the movement trajectory Q of the tip 162 of the wiper member 160 can be easily performed. It can be carried out.

The initial position of the upper end of the third arm 130 is changed by adjusting the mounting position of the stopper 106 or by changing the mounting angle of the second arm 128 with respect to the pin 140. be able to. FIG. 6 shows an example in which the initial position of the upper end of the third arm 130 is changed to be lower than the case of FIGS.

In this case, instead of the wiper member 160 shown in FIGS. 1 to 5, as shown in FIG. 6B, the needle thread catching portion 262a is arranged in the reverse direction of the cloth feeding (the direction B in FIG. 1). Wiper member 26 having hook-shaped tip 262 formed
0, the wiper member 16 of FIGS.
The needle thread 18 can be dispensed in a manner different from zero.

That is, as described above, after the sewing is completed, when the thread trimming device is operated and the solenoid 110 is operated for a predetermined period of time, the pin 136, the first link 122, the second link 124, and the first arm 126 are connected. As a result, the second arm 128 performs a rocking motion, and as a result, moves to a position shown by a two-dot chain line in FIG. At this time, the third arm 130 rotates the piece 146 while sliding in the through hole 146a of the piece 146. As a result, the tip 262 of the wiper member 260 fixed to the lower end of the third arm 130 draws a motion trajectory R,
Swings almost in the feed direction.

At this time, the tip 26 of the wiper member 260
2 has a shape as shown in FIG.
Since “a” is in the moving direction of the tip 262 of the wiper member 260, the needle thread 18 is captured and pulled out from the sewing product 12.

When the operation of the solenoid 110 is completed, the links 122 and 124, the arms 126, 128 and 130, and the wiper member 260 are returned to their initial positions by the action of the tension spring 144.

In the embodiment shown in FIGS.
Since the needle thread is pulled out by the return force by 4,
When pulling out the needle thread 18 to which a strong tension is applied, a stronger spring force is required, and the suction force by the solenoid 110 needs to be increased to overcome the spring. In this manner, the thread removing method of pulling out the needle thread 18 from the sewing product 12 when the needle thread 18 is pulled back in the direction of the arrow in FIG.

On the other hand, in the embodiment shown in FIG. 6, the tip 262 of the wiper member 260 is connected to the solenoid 1
When the needle thread 18 is moved by the suction force of the
Pull out from. Therefore, it is sufficient that the tension spring 144 has a force enough to return the links 122 and 124 and the arms 126, 128 and 130 to the initial position.

Further, the direction in which the needle thread 18 is pulled out is also
The direction of the cross-section 14a is
Reference numeral 4 denotes a portion where the sewing product 12 cannot be pressed. In the case of FIGS. 1 to 5, as shown in FIG. 3C, the needle thread 18 is pulled out in the direction of the portion 14 b of the presser 14 that presses the sewing product 12, but in the case of FIG. Less power to pull out. As described above, the thread removing method of pulling out the needle thread 18 from the sewing product 12 when moving in the direction of the arrow in FIG.

As described above, according to the present embodiment, third arm 130 to which wiper members 160 and 260 are fixed is provided.
By changing the initial position of the upper end of the wiper member and replacing the wiper member with the wiper member 160 for the wiping method or the wiper member 260 for the wiping method, the wiper thread wiping method can be easily changed to the wiping method or the wiping method. Can be switched.

In the present embodiment, the wiper member 16
The fulcrum 146c at the lower end of the third arm 130 to which 0 is fixed
Is the lower surface 6a of the front end surface (surface portion) 6 of the arm 5 of the sewing machine 4.
Since it is located above the link mechanism 120, the link mechanism 120 does not hinder the sewing operation.

Further, since the piece 146 and the third arm 130 are supported by the surface, occurrence of backlash is largely suppressed.

Next, a second embodiment shown in FIG. 7 will be described. This embodiment is different from the first embodiment in that a third arm 130 and a piece 146 each having a rod shape
Only the third arm 230 in the form of a plate on which the 30a is formed is used, and other points are the same.

At the lower end of the third arm 230, a groove 230b capable of accommodating the wiper member 160 (260) is formed. The wiper member 160 (260) is arranged between the wiper retainer 232 and the third arm 230, in which the groove 232a having the same shape as the groove 230b is formed, so as to fit into the two grooves 230b and 232a, and a screw 234 is provided. , 234 fix the wiper presser 232 to the third arm 230.

The pin 142 shown in FIGS. 1, 3 and the like is inserted into the hole 230c at the upper end of the third arm 230 so that the second arm 128
Connect with Insert the pin 236 into the base 1 through the groove 230a.
Fix to 02. By the swinging motion of the second arm 128, the third arm 230 is guided by the pin 236 and the groove 230a, and the tip 162 (26) of the wiper member 160 (260).
Move 2). Shape of Groove 230a and Third Arm 2
By appropriately setting the initial position of the upper end of 30, the same movement trajectory of the wiper as Q in FIG. 3A or R in FIG. 6A can be obtained.

Next, a third embodiment shown in FIG. 8 will be described. In this embodiment, one end is connected to a pin 340.
Second arm 32 connected to a first arm (not shown) through
The third arm 330 connected to the other end of the arm 8 via a pin 342
A pin 332 is fixed to the lower end of the frame. Wiper member 1
60 (260) is fixed to the wiper fixing member 344, and the wiper fixing member 344 is fastened and fixed to the pin 332 by the screw 346.

On the base 302, a cam plate 348 is
0,350. In the cam plate 348,
A cam groove 348a is formed, and a groove having a size such that the cam groove 348a is completely exposed to the back surface side is formed in the base 302. The pin 332 is connected to the cam groove 348.
a.

By the swinging movement of the second arm 328, the third arm 330 is guided by the pin 332 and the cam groove 348a,
Tip 162 (262) of wiper member 160 (260)
To move. The shape of the cam groove 348a and the third arm 33
By appropriately setting the initial position of the upper end of 0, FIG.
A movement trajectory of the wiper similar to Q of (A) or R of FIG. 6A can be obtained.

The cam plate 348 can be omitted by forming the cam groove 348a directly on the base 302. However, by using a cam plate 348 separate from the base 302 as in the illustrated example, the cam groove 34
By changing the shape of 8a, the movement locus of the wiper can be easily changed.

As described above, the present invention has been described based on the embodiments shown in the drawings. However, the present invention is not limited to these embodiments and can be variously modified. For example, the second arm 1
28, the plunger-type solenoid 11
0 and first link 122,124, first arm 126
However, the second arm 128 may be directly swung by a rotary solenoid.

[0056]

According to the present invention, a sewing machine is provided with a link mechanism attached near the front end of an arm portion of a sewing machine for swinging a wiper member along a feed direction, and a driving means for driving the link mechanism. In a wiper device of a sewing machine for pulling out a needle thread cut after completion from a sewing product, a lower end of the link mechanism is configured to be higher than a lower surface of a front end of an arm portion, or the wiper member is provided with the link mechanism. Since the lower arm fulcrum of the sliding arm is located above the lower surface of the front end of the arm, the entire mechanism is located above the lower surface of the front surface of the arm. The cloth can be surely transferred without being damaged, and does not hinder the sewing operation.

The link mechanism has a slide arm for fixing the wiper member, and the lower end fulcrum of the slide arm is configured to be able to slide the slide arm vertically and simultaneously to swing. The arm is supported by the surface, and the occurrence of backlash is greatly suppressed. Therefore, there is provided a wiper device of a sewing machine which can reliably capture a needle thread.

The upper end of the slide arm is connected to the slide arm via a connection shaft, the connection axis is set as an eccentric shaft, and the movement locus of the tip of the wiper member is made variable. Can be very easily adjusted.

Further, according to the present invention, there is provided a wiper device of a sewing machine which can be easily switched between a pull-out method and a push-out method.

[Brief description of the drawings]

FIG. 1 is a front view showing a wiper device according to a first embodiment of the present invention together with a sewing machine main body.

FIG. 2 is a side view showing the first embodiment of the present invention.

FIG. 3 is a side view of a partial cross section showing a modification of the first embodiment.

4A and 4B show a wiper device according to a first embodiment of the present invention, wherein FIG. 4A is an enlarged front view of the wiper device, FIG. 4B is a top view of the tip of the wiper, and FIG. It is a perspective view for explaining operation which pays.

FIG. 5 is a rear view of the wiper device according to the first embodiment of the present invention.

FIG. 6 is a rear view showing only a part of the wiper device according to the first embodiment of the present invention, wherein (A) shows a state where the wiper device is at an initial position (standby position), and (B) shows a wiper device. FIG. 4 is a diagram for explaining a state in which is located at an operating position.

FIG. 7 shows an example in which the initial position of the wiper and the like and the wiper of the apparatus of FIGS. 1 to 5 are changed, (A) is a front view,
(B) is a top view of the tip of the wiper, (C) is a perspective view for explaining the operation of pulling out the needle thread.

8A and 8B show a main part of a wiper device according to a second embodiment of the present invention, wherein FIG. 8A is an exploded view and FIG. 8B is a front view.

9A and 9B show a main part of a wiper device according to a third embodiment of the present invention, wherein FIG. 9A is a front view and FIG. 9B is a side view.

FIG. 10 is a diagram illustrating a wiper device of a sewing machine according to a conventional example.

FIG. 11 is a view showing a wiper device of a sewing machine according to another conventional example.

[Explanation of symbols]

2 sewing machine bed 4 sewing machine 5 arm
6 Front end surface (surface portion) 6 Surface portion 6a Lower surface 7 Jaw portion 8
Needle bar 12 Sewing material 12a Part of the sewing material that has passed through the presser foot 14 Presser foot 14a or section 16 Needle 18 Needle thread 50 Wiper device 52 Solenoid 54
Link mechanism 55 Support point 56 Wiper member 56a Tip 100 Wiper device 102 Base 102
a, 102b End face 104, 104 Screw 106 Stopper 106a Slot 108
Elastic body 110 Solenoid 112 Plunger
120 link mechanism 122 first link 122a bifurcation 12
4 Second link 126 First arm 128 Second arm 129,129 Screw 130 Third arm (slide arm) 132 Screw 134 Screw 136 Pin
138 screw 140 pin 142 pin 143 eccentric pin 143a, 143b cylindrical part 144 tension spring 146 piece 146a through hole (sliding part) 146c center (fulcrum) 160, 260 wiper member 162 tip
162a Needle thread catcher 230 Third arm 230a Groove 230b
Groove 230c Hole 232 Wiper retainer 232
a Groove 234, 234 Screw 236 Pin 262
Tip 262a Needle thread catcher 302 Base 328
Second arm 330 Third arm 332 pin 340 pin 342 pin 344 Wiper fixing member 346 Screw 3
48 Cam plate 348a Cam groove 350, 350 Screw

Claims (4)

[Claims] 1. A needle which is attached near a front end of an arm portion of a sewing machine and swings a wiper member along a feed direction, and a driving means for driving the link mechanism, and a needle cut after sewing is completed. A wiper device for a sewing machine for extracting a thread from a sewing product, wherein a lower end of the link mechanism is located above a lower surface of a front end of an arm portion. 2. The link mechanism has a slide arm for fixing the wiper member, and a lower end fulcrum of the slide arm is
2. The wiper device for a sewing machine according to claim 1, wherein the sliding arm is configured to be able to slide up and down and swing at the same time. 3. The wiper member according to claim 2, wherein the upper end of the slide arm is connected to the slide arm via a connection shaft, the connection shaft is an eccentric shaft, and the movement locus of the tip end of the wiper member is variable. The wiper device of the sewing machine according to the above. 4. The sewing machine is attached to a front portion of an arm portion of the sewing machine,
A wiper device for a sewing machine, comprising: a link mechanism that swings a wiper member along a feed direction; and a driving unit that drives the link mechanism. The link mechanism has a slide arm that fixes the wiper member to a lower end, and a lower end fulcrum of the slide arm is configured to be able to slide the slide arm up and down and swing at the same time. A wiper device for a sewing machine, wherein a thread wiper system can be switched between a pull-out system and a push-out system by moving an initial position of a section.