JPH09770A - Lower thread bobbin residual thread removing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a residual thread removing device for a bobbin bobbin, which can prevent the residual thread from being entangled with a hook, a pulley or the like when the residual thread is wound from a bobbin thread bobbin. . [Composition] Rotating pulley 12 and take-up pulley
13 is provided, the hook 11 is attached to the rotary pulley 12, and a push pin 17 that pushes the hook 11 and retracts from the periphery of the rotary pulley 12 when the take-up pulley 13 contacts the rotary pulley 12. Therefore, by bringing the take-up pulley 13 into contact with the rotary pulley 12, the take-up pulley 13 rotates to start winding the residual yarn, and the hook 11 makes the rotary pulley 12 rotate.
Since it retreats from the periphery of 12, when winding the residual thread, the residual thread does not get entangled with the hook 11 and violently, so
It is possible to prevent the residual thread from being entwined around the hook 11 and the rotary pulley 12 in a complicated manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine used for sewing, from a lower thread bobbin in which a lower thread remains.
The present invention relates to a residual thread removing device for a bobbin bobbin that removes residual residual thread.

[0002]

2. Description of the Related Art When a bobbin thread is running low during sewing of a sewing machine, the bobbin thread bobbin wound with the remaining bobbin thread is replaced with a bobbin thread bobbin wound with a new bobbin thread. , Remove the bobbin thread bobbin on which the residual thread is wound from the bobbin thread bobbin case, remove the residual thread, rewind the bobbin thread by winding a new bobbin thread on the bobbin thread bobbin, and then replace the bobbin thread bobbin. As an example of an apparatus for automating a series of operations provided, there is known an apparatus described in Japanese Patent Application Laid-Open No. 7-75696.

Japanese Unexamined Patent Publication No. 7-75696 discloses an apparatus for removing the residual yarn from the bobbin bobbin, which is one of the series of operations. This device will be briefly described with reference to FIG. The bobbin thread bobbin 1 around which the residual thread S is wound is pulled out from the bobbin thread bobbin case 2 and rotatably supported by the support shaft 3. In this state, the bobbin thread bobbin 1 and the bobbin thread bobbin are A part S1 of the residual yarn S is stretched between the case 2 and the case 2.

On the other hand, in the vicinity of the lower thread bobbin 1, a frustoconical take-up pulley 4 is rotatably arranged.
The take-up pulley 4 is connected to the piston shaft 5a of the cylinder 5 and moves in the axial direction by the reciprocating movement of the piston shaft 5a. Further, in front of the take-up pulley 4, a conical trapezoidal rotary pulley 6 is arranged coaxially with the take-up pulley 4, and the rotary pulley 6 is connected to a motor shaft 7a of a motor 7 and connected to the motor shaft 7a. The rotation of the shaft 7a causes it to rotate about the axis. Further, a base end portion of a hook 8 for hooking a part S1 of the residual yarn S is fixed to the rotary pulley 6.

Then, in order to wind the residual yarn S around the winding pulley 4 by the device having the above-mentioned structure, the motor shaft 7a is rotated in a closed state where the winding pulley 4 and the rotary pulley 6 are butted against each other. , The tip of the hook 8 is hooked on a part S1 of the residual thread S stretched between the bobbin thread bobbin 1 and the bobbin thread bobbin case 2, and is wound around the abutting portions of the pulleys 4, 6. The remaining yarn S is entirely wound around the winding pulley 4 that is rotating together with the rotating pulley 6. Then, the residual yarn S wound around the winding pulley 4 is separated from the rotary pulley 6 by the piston shaft 5a when the winding pulley 4 is separated,
Since the take-up pulley 4 has a truncated cone shape, the take-up pulley 4 falls downward and is collected.

[0006]

However, the residual yarn removing device having the above structure has the following problems. That is, since the hook 8 is fixed to the rotary pulley 6 and always rotates around the rotary pulley 6 when winding the residual yarn, the yarn end at the initial winding of the residual yarn and the residual yarn being wound are In some cases, the hook 8 may be entangled and run wild, or the hook 8 may be wound between the rotary pulley 6. In this case, the residual yarn S is wound on the take-up pulley 4, the rotary pulley 6 and the hook 8,
Since the yarn is complicatedly entangled and wound, the residual yarn may not be discarded after the winding of the residual yarn from the lower yarn bobbin 1 is completed.

The present invention has been made in view of the above circumstances. When the residual yarn is wound from the bobbin bobbin, the residual yarn is prevented from being entangled with a hook, a pulley or the like, and the residual yarn is surely discarded. It is an object of the present invention to provide a residual thread removing device for a bobbin thread bobbin that can be carried out.

[0008]

In order to achieve the above object, a residual thread removing device for a lower thread bobbin according to claim 1 of the present invention comprises:
A pulley that is rotatably provided near the lower thread bobbin taken out from the lower thread bobbin case to wind up the remaining thread, and one of the remaining threads stretched between the lower thread bobbin and the lower thread bobbin case. A hook that pulls a part of the residual thread toward the pulley by moving the hook portion to the pulley side, and the hook is provided so as to be retractable from around the pulley when the residual thread is wound. is there.

A residual thread removing device for a lower thread bobbin according to claim 2 is
2. The pulley according to claim 1, wherein the pulley comprises a rotary pulley rotatably provided around an axis, and a take-up pulley for winding the residual yarn, which is coaxially attached to and separated from the rotary pulley. While attaching the hook to the rotary pulley, when the take-up pulley contacts the rotary pulley, a push pin that is pushed and moved by the take-up pulley to retract the hook from the periphery of the rotary pulley is attached to the rotary pulley. It is provided so as to be movable in the axial direction of.

A residual thread removing device for a lower thread bobbin according to claim 3 is
In claim 2, the winding pulley is formed in a tapered shape.

[0011]

In the residual thread removing device for the bobbin thread bobbin according to the present invention, a hook is hooked on a part of the residual thread stretched between the bobbin thread bobbin and the bobbin thread bobbin case to move to the pulley side. By doing so, a part of the residual yarn is pulled toward the pulley, and the residual yarn starts to be wound around the winding pulley. When the residual yarn is wound, the residual yarn is prevented from being entangled with the hook by retracting the hook from the periphery of the pulley, thus preventing the residual yarn from being entangled intricately entangled with the hook or the pulley. You can

According to another aspect of the present invention, there is provided a residual thread removing device for a bobbin thread bobbin, in which a part of the residual thread stretched between the bobbin thread bobbin and the bobbin thread bobbin case is rotated by rotating the rotary pulley. The hook is hooked, and a part of the residual yarn is pulled to the rotary pulley by the hook, and then the take-up pulley is brought into contact with the rotary pulley. Then, the push pin is pushed and moved by the take-up pulley and pushes the hook, whereby the hook retracts from the periphery of the rotary pulley. On the other hand, the take-up pulley starts to rotate to start winding the residual yarn at the time of contact with the rotary pulley, but at the time of winding the residual yarn, since the hook is retracted from the periphery of the pulley, the residual yarn is It is possible to prevent the residual yarn from being entwined around the hook and the rotary pulley in a complicated manner because the residual yarn is not entangled with the hook.

According to another aspect of the present invention, in the residual thread removing device for the bobbin thread bobbin, the winding pulley has a tapered shape. Therefore, when the residual thread is discarded, the winding pulley is wound around the winding pulley. Since the taken residual yarn slides down toward the front end side of the winding pulley, the residual yarn can be reliably discarded.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the bobbin residual thread removing device of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the lower thread bobbin residual thread removing device according to the present embodiment extends between a pulley 10 for winding the residual thread from the lower thread bobbin 1 and a lower thread bobbin 1 and a lower thread bobbin case 2. A hook 11 that hooks a part S1 of the residual thread S that has been pulled and moves the part S1 of the residual thread S to the pulley 10 by moving it toward the pulley 10 is provided.
Is provided so as to be retractable from around the pulley 10 when the residual yarn is wound.

The lower thread bobbin 1 is pushed out of the bobbin case 2 by a pusher (not shown) or the like, and is supported by a support shaft 3 so as to be rotatable about its axis. In this state, a part S1 of the residual thread S is stretched between the lower thread bobbin 1 and the lower thread bobbin case 2. The pulley 1
Reference numeral 0 denotes a shaft provided in parallel with the support shaft 3, a rotary pulley 12 provided so as to be rotatable around the shaft, and a residual yarn winding device provided coaxially with the rotary pulley 12 so as to come in contact with and separate from the rotary pulley 12. And a take-up pulley 13 for.

The rotary pulley 12 is in the shape of a truncated cone whose front end is tapered, and the drive shaft 14a of the motor 14 is connected to the central portion of the base end face 12a thereof. A through hole 15 is formed in the center of the rotary pulley 12 so as to extend in the axial direction and open at both ends to the base end surface 12a and the front end surface 12b of the rotary pulley 12. As shown in FIG. 6, the through hole 15 is composed of a large diameter portion 15a and a small diameter portion 15b coaxially formed at the tip thereof, whereby an annular shape is provided at the tip of the large diameter portion 15a. A wall surface 15c is formed.

A hole 16 having the same diameter and the same diameter as the through hole 15 is formed on the tip end surface of the drive shaft 14a of the motor 14 and is connected to the through hole 15. The through holes 15 and 16 have The push pin 17 is inserted movably in the axial direction. The push pin 17 has a columnar shape, and is formed coaxially with the pin body 17a and the tip thereof, and the through hole 15 is formed.
And a small-diameter protrusion 17b that can be inserted into the small-diameter portion 15b of the pin main body 17a. Then, the push pin 17 having the above-described configuration has the contact surface 1 in the state where the protrusion 17b is inserted into the small diameter portion 15b.
By coming into contact with the wall surface 15c, 7c is prevented from coming out of the through hole 15.

On the outer peripheral surface of the drive shaft 14a, as shown in FIG. 6, a pair of slits 18, 18 which are long in the axial direction and open to the hole 16 are provided in the radial direction of the drive shaft 14a. It is formed facing each other. On the other hand, the rotary pulley 1
A base end portion of the hook 11 is fixed to the base end surface 12a of the second hook 11 by welding or the like. The hook 11 is formed by bending a wire at an appropriate position, and has a base end 11a.
And a hook body 11b which extends from the base end portion 11a at right angles to the drive shaft 14a and is inserted through the slits 18, 18 and the hole 16 to penetrate the drive shaft 14a at a right angle, and the hook body 11b. An extending portion 11c that is bent from the front end portion of 11b and extends beyond the base end surface 12a of the rotary pulley 12 to the periphery of the outer peripheral surface of the rotary pulley 12.
And the residual yarn S formed at the tip of the extending portion 11c.
A hook portion 11d which hooks a part S1 of the hook body 11b which penetrates the drive shaft 14a,
The base end of the push pin 17 is in contact.

The hook 11 is elastically bendable in a direction from the base end 11a of the hook 11d to the rear side of the base end surface 12a of the rotary pulley 12 with the base end 11a as a fulcrum. When 11 is elastically bent, the hook body 11b moves in the slits 18 and 18,
The hook portion 11d is located rearward of the base end surface 12a of the rotary pulley 12, and the hook portion 11d is elastically restored.
Are returned around the outer peripheral surface of the rotary pulley 12. A spring 19 is provided in the hole 16 of the drive shaft 14a.
May be inserted to enhance the elastic return force.

As shown in FIG. 1, the take-up pulley 13 is in the shape of a truncated cone that is coaxial with the rotary pulley 12 and has a tapered front end. The cylinder 20 is provided at the center of the base end face 13a. The piston shaft 20a is connected to the take-up pulley 13 so that the take-up pulley 13 can come into contact with and separate from the rotary pulley 12. In addition, the tip surface 13 of the take-up pulley 13
b is formed to have the same diameter as the tip surface 12b of the rotary pulley 12, whereby the take-up pulley 13 and the rotary pulley 1 are formed.
When the two contact with each other, the tip end surfaces 13b and 12b do not have a step, and they match exactly, that is, no edge is formed on the outer periphery of the tip end surfaces 13b and 12b. It is possible to prevent the residual yarn from being cut off at the time.

The tip surface 13b of the winding pulley 13
A pressing protrusion 21 that can be inserted into the small diameter portion 15b of the through hole 15 formed in the rotary pulley 12 is formed in the central portion of the. When the take-up pulley 13 comes into contact with the rotary pulley 12, the pressing projection 21 has the small diameter portion 15b.
The hook 11 is elastically bent, as described above, by being inserted into and being pushed and moved.

Next, a method of winding the residual yarn from the lower yarn bobbin 1 by the residual yarn removing device for the lower yarn bobbin having the above-mentioned structure will be described. First, as shown in FIG. 1, the winding pulley 1
In a state in which 3 is separated from the rotary pulley 12, a part S1 of the residual thread S stretched between the lower thread bobbin 1 and the lower thread bobbin case 2 is hooked by the hooking portion 11d of the hook 11.

Next, as shown in FIG. 2, the rotary pulley 1
The motor 2 is rotated about a half turn by the motor 14. Then, the hooking portion 11d of the hook 11 is rotated and a part S1 of the residual thread S is
To the outer peripheral surface of the rotary pulley 12. At this time, the residual thread S stretched between the hook portion 11d and the bobbin thread bobbin 1 is
S1 is located slightly outside the edge of the tip surface 12b of the rotary pulley 12.

Next, as shown in FIG. 3, the winding pulley 1
The cylinder 3 is brought into contact with the rotary pulley 12 by the cylinder 20. Then, the pressing protrusion 2 at the tip of the take-up pulley 13
1 is inserted into the small-diameter portion 15b of the through hole 15 of the rotary pulley 12, and the push pin 21 is inserted by the inserted press projection 21.
7 is pushed and moved, and further, the push pin 17 pushes the hook 11 to elastically bend with the base end portion 11a as a fulcrum. As a result, the hooking portion 11d moves rearward from the base end surface 12a of the rotary pulley 12, and the hook 1
The entire 1 retracts from the periphery of the rotary pulley 12.

On the other hand, the take-up pulley 13 is moved from the rotary pulley 12 to the motor 1 when the rotary pulley 12 comes into contact.
4 The power is transmitted and starts to rotate, but when the take-up pulley 13 comes into contact with the rotary pulley 12, the abutting portion 22
The winding end portion of the residual yarn S is wound around and clamped at the winding end portion, and thereafter, as shown in FIG. 4, the winding pulley 13 rotates together with the rotating pulley, so that the lower thread bobbin 1 The remaining yarn S wound around the take-up pulley 13
And, all is wound up on the rotary pulley 12.

Therefore, at the time of winding the residual yarn, the hook 11 is retracted from the periphery of the rotary pulley 12, so that the residual yarn S is not entangled with the hook 11, and therefore the residual yarn S is not rotated. It is possible to prevent the pulley 12 from being intricately entangled and wrapped around. The residual thread stretched between the hook 11 and the bobbin thread bobbin case 2 is pulled by the rotation of the winding pulley 13 after all the residual thread wound around the bobbin thread bobbin 1 has been wound up. The lower thread bobbin case 2 is disengaged from the lower thread tension spring and wound around the winding pulley 13.

When the winding of the residual yarn S is completed, the winding pulley 13 is separated from the rotary pulley 12 by the cylinder 20 as shown in FIG. Then, the winding pulley 13 is stopped because it is separated from the driving force of the rotating pulley 12, and then the residual yarn S is extracted from the winding pulley 13, collected in a vacuum suction device or the like, and discarded. At this time, since the take-up pulley 13 has the shape of a truncated cone, the residual yarn S can be easily removed from the take-up pulley 13 and can be pulled out at once in the axial direction. When the take-up pulley 13 is separated from the rotary pulley 12, the elastic return force causes the hook 11 to rotate about the base end portion 11a as a fulcrum to return to the original position and prepare for the next residual thread take-up.

Further, in the above method for winding the residual yarn,
Due to the hooking portion 11d of the hook 11, a part S of the residual thread S
When hooking 1 and pulling it toward the outer peripheral surface of the rotary pulley 12, a part S1 of the residual thread S stretched between the hook portion 11d and the bobbin thread bobbin 1 is the tip surface 12b of the rotary pulley 12.
Although it was drawn so as to be positioned slightly outside the edge portion of the above, it may be drawn as follows.

That is, when pulling a part S1 of the residual thread S by the hooking portion 11d of the hook 11, the part S1 of the residual thread S stretched between the hooking portion 11d and the bobbin bobbin 1 is pulled. , Is pulled so as to be located between the front end surface 12b of the rotary pulley 12 and the front end surface 13b of the winding pulley 13. By doing this, the take-up pulley 13 is replaced by the rotary pulley 1.
2 and the winding end portion of the residual yarn S is
Since the end faces 12b and 13b of the wires 2 and 13 are clamped by being pinched, when the winding pulley 13 starts to rotate, the residual yarn S is surely wound by the winding pulley 13 and the residual yarn S idles. Therefore, the residual yarn can be reliably wound around the winding pulley 14.

In the above embodiment, the take-up pulley 13
Was formed into a truncated cone shape with a taper on the tip side, but is not limited to this, for example, it may be formed into a truncated pyramid shape with a taper on the tip side, or a pair of large and small discs are separated coaxially. It may be arranged such that a plurality of blades having inclined sides are arranged and connected at predetermined intervals in the circumferential direction between these disks, and further, in a simple columnar shape or a prismatic shape. You may form.

In the above embodiment, the hook 11 is attached to the rotary pulley 12 and is moved by the rotation of the rotary pulley 11 to draw a part of the residual yarn.
The present invention is not limited to this, and the hook may be independently provided and the hook may be moved by another actuator or the like. In short, any structure may be used as long as the hook is provided so as to be retractable from around the rotary pulley when the residual yarn is wound.

Further, in the above embodiment, the pulley 10 is composed of two pulleys, the rotary pulley 12 and the winding pulley 13, but the pulley 10 may be composed of only the winding pulley. In this case, a motor shaft is connected to the take-up pulley instead of the cylinder shaft so that the take-up pulley is directly rotated, and a hook is provided independently, and this hook is connected to the take-up pulley by another actuator or the like. It may be configured such that it moves between the lower thread bobbin and the lower thread bobbin, and at the time of winding the residual thread, the hook may be provided so as to be retractable from the periphery of the winding pulley.

[0033]

As described above, according to the first aspect of the present invention.
According to the residual thread removing device for the lower thread bobbin, a part of the residual thread stretched between the lower thread bobbin and the lower thread bobbin case is removed from the pulley that winds up the residual thread around the lower thread bobbin. A hook that is hooked and pulled toward the pulley, and the hook is provided so as to be retractable from the periphery of the pulley when winding the residual yarn, so that when the residual yarn is wound, the hook retracts from the periphery of the pulley, The residual thread does not get entangled with the hook and run wild. Therefore, it is possible to prevent the residual yarn from being complicatedly entangled with the hook or the pulley and being wrapped around the hook or the pulley, so that the residual yarn can be reliably discarded.

According to a second aspect of the present invention, there is provided a residual thread removing device for a bobbin bobbin according to the first aspect of the present invention. Since the rotary pulley is provided with a push pin for attaching the hook to the rotary pulley and pressing the hook to retract from the periphery of the rotary pulley when the winding pulley contacts the rotary pulley, Simply by bringing the take-up pulley into contact with the rotary pulley, the take-up pulley begins to rotate and the hook retracts from the periphery of the rotary pulley. Therefore, at the time of winding the residual yarn, the residual yarn does not get entangled with the hook and violently, so that it is possible to prevent the residual yarn from being complicatedly entangled with the hook or the rotary pulley and wound around, and thus discarding the residual yarn Can be reliably performed. Further, since the hook is moved to the side of the rotary pulley by utilizing the rotation of the rotary pulley, it is not necessary to additionally provide a drive source for moving the hook, and therefore the apparatus itself can be made compact.

According to the residual thread removing device for the lower thread bobbin of claim 3, since the winding pulley has a tapered shape, when the residual thread is discarded, the winding pulley is wound around the winding pulley. The remaining yarn thus slid down toward the front end side of the winding pulley, so that the remaining yarn can be reliably discarded.

[Brief description of drawings]

FIG. 1 shows an embodiment of a residual yarn winding device of the present invention and is a side view of the device.

FIG. 2 is a side view of the device showing a state where a part of the residual yarn is pulled by the hook.

FIG. 3 is a side view of the device showing a state where the take-up pulley is in contact with the rotary pulley.

FIG. 4 is a side view of the device showing a state in which the remaining yarn has been wound up by the winding pulley.

FIG. 5 is a side view of the device showing a state in which the residual yarn is extracted from the winding pulley.

FIG. 6 is a side sectional view of the rotary pulley of the same.

FIG. 7 shows an example of a conventional residual yarn winding device, and is a side view of the device.

[Explanation of symbols]

 S Remaining thread S1 Part of remaining thread 1 Lower thread bobbin 2 Lower thread bobbin case 10 Pulley 11 Hook 12 Rotating pulley 13 Take-up pulley 17 Push pin

Claims (3)

[Claims] 1. A bobbin thread residual thread removing device for removing residual thread from a bobbin thread bobbin of a sewing machine, rotatably provided near a bobbin thread bobbin taken out from a bobbin thread bobbin case, A part of the residual thread stretched between the pulley that winds up the residual thread, the lower thread bobbin, and the lower thread bobbin case is hooked, and the residual thread is partially moved by moving to the pulley side. A residual thread removing device for a bobbin bobbin, comprising: a hook that pulls toward the pulley, wherein the hook is provided so as to be retractable from around the pulley when the residual thread is wound up. 2. The residual thread removing device for the bobbin thread bobbin according to claim 1, wherein the pulley is provided so as to be rotatable about an axis, and coaxially connectable to and detachable from the rotary pulley. ,
A take-up pulley for winding the residual yarn, the hook is attached to the rotary pulley, and when the take-up pulley comes into contact with the rotary pulley, the take-up pulley is pressed and moved. A residual thread removing device for a bobbin thread bobbin, wherein a push pin for retracting the hook from the periphery of the rotary pulley is provided so as to be movable in the axial direction of the rotary pulley. 3. The residual thread removing device for a lower thread bobbin according to claim 2, wherein the winding pulley is formed in a tapered shape. .