JPH0744445U - Sewing machine thread wiper - Google Patents

Abstract

(57) [Summary] [Purpose] In a thread-removing device of a sewing machine, the operation direction of thread-removing is changed to a desired direction. [Structure] An outer cylinder through which a needle bar penetrates, a first transmission means attached to a base that engages with the outer cylinder, and capable of changing the position in the horizontal direction along the outer circumference of the outer cylinder, and the first transmission means. And a reciprocating thread wiper that intersects the needle path, and a second transmission means that is provided on the outer cylinder and that is normally joined to the first transmission means and that is reciprocally rotated by a drive means. And a contacting / separating means for connecting and disconnecting the two transmitting means, and the first and second contacting / separating means.
By releasing the joined state of both transmission means and rotating the base around the outer cylinder to change the position of the first transmission means, it is possible to freely adjust the position of the thread wiper, that is, change the operation direction of the thread wiper. Can be done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thread wiping device for a sewing machine equipped with a thread cutting device, and more particularly to a thread wiping device in which a thread wiping direction can be freely set.

[0002]

[Prior art and problems to be solved]

 When the sewing operation is completed, the sewing needle rises to the original position, while thread cutting is performed on the lower surface of the needle plate, breaking the connection between the hook and the upper thread.In this state, the upper thread end is sewn It is often in the state of being engaged with. Therefore, if the material to be sewn is moved in this state, the upper thread will also be pulled out. As a means for preventing such unnecessary drawing of the needle thread, a sewing machine has been conventionally provided with a so-called thread wiper. This is a structure in which the needle thread end that is still in the material to be sewn is pulled out by activating the needle thread wiper that is in the tension state between the material to be sewn and the sewing needle. There is.

However, in this type of conventionally known thread-displacing device, there is a difference in that the operation of thread-displacing is side-discharging (horizontal direction when viewed from the front of the sewing machine) or pre-disposal (front-rear direction when viewed from the front of the sewing machine). However, the movement direction of the thread wiper was fixed and could only be done in a fixed direction. For this reason, there are some inconveniences such as an unexpected risk of hitting the sewing machine operator's hand, and a thread wiper being caught at the step of a sewing product having a step.

[0004]

[Means for Solving the Problems]

 The thread removing device of the sewing machine according to the present invention is attached to an outer cylinder through which the needle bar penetrates and a base that meshes with the outer cylinder, and is capable of horizontal position change along the outer circumference of the outer cylinder. Means, a thread wiper which follows the first transmission means and reciprocates across the needle path, and a threading device which is provided on the outer cylinder and which is always joined to the first transmission means and is rotated back and forth by the drive means. 2 transmission means, and a contacting / separating means for joining and releasing the first and second transmission means, and the contacting / separating means includes the base to which the first transmission means is attached, The base is configured by an elastic body that presses the base to normally join the first transmission means and the second transmission means, or the contacting / separating means is the base to which the first transmission means is attached. And a loose tightening step for mounting the base on the outer cylinder so that the position can be changed. That.

Further, the base is provided with a positioning means, which is composed of a positioning pin formed on the outer cylinder and a plurality of grooves formed on the base to engage the positioning pin. It is possible to further facilitate the position adjustment of the thread wiper, that is, the conversion of the operation direction of the thread wiper.

[0006]

[Action]

 When the base is moved downward on the outer cylinder by the contacting / separating means, the first transmitting means is also moved downward, so that the connection between the first transmitting means and the second transmitting means is released and the base and the first transmitting means are released. The transmission means can be rotated around the outer cylinder, and the positions of the base and the first transmission means in the outer cylinder circumferential direction can be freely set. When the base and the first transmitting means are returned to their original positions by the contacting / separating means with the predetermined position set, the first transmitting means and the second transmitting means are brought into the joined state again. By the position conversion of the first transmission means, the position of the thread wiper attached to the first transmission means is also changed, and the operation direction of the thread wiper is also set to the desired direction.

[0007]

[Example of device]

 An embodiment of the present invention will be described with reference to the drawings. 1 to 3 are views showing an embodiment of a yarn wiping device according to the present invention. In each drawing, 1 is a gear base as a base, 2 is a first bevel gear which is a first transmission means, 3 is a thread wiper, 4 is a second bevel gear which is a second transmission means, 5 is a needle bar, 6 Is an outer cylinder, 7 is a pressing spring as an elastic body, and 8 is a stopper.

As shown in FIGS. 2 and 3, the gear base 1 is rotatably engaged with an outer peripheral portion of an outer cylinder 6 described later, and has a first bevel gear 2 attached to a side portion thereof. A thread wiper 3 is suspended and fixed to the bevel gear 2 by a screw 3a, and is driven by the reciprocating rotation of the bevel gear 2 to cross the needle path and reciprocate to sew a sewing needle (not shown) and a sewing target. Pull out the upper thread that is in a stretched state between the sewing machine and a material (not shown), and pull out the upper thread end moored in the material to be sewn.

The second bevel gear 4 serving as the second transmission means is rotatably engaged with the outer peripheral portion of the outer cylinder 6 and is located above the gear stand 1, and its tooth portion is normally provided with the tooth portion of the bevel. It meshes with the teeth of the gear 2. The second bevel gear 4 is provided with a lever 41 as shown in FIGS. 2 and 3, and reciprocally rotates the second bevel gear 4 in accordance with the operation of the drive means described later. The second bevel gear 4 is held at a predetermined position on the outer cylinder 6 by stoppers (not shown) provided above and below the second bevel gear 4.

The outer cylinder 6 is engaged with the outer periphery of the needle bar 5, and the gear base 1, the second bevel gear 4 and the like are held at predetermined positions on the outer peripheral surface thereof as described above.

The pressing spring 7 is wound around a predetermined position of the outer cylinder 6 by a stopper 8 to urge and hold the gear stand 1 with the second bevel gear 4. The pressing spring 7, the stopper 8 and the gear base 1 constitute a contacting / separating means for connecting and disconnecting the first and second bevel gears.

In FIG. 3, 9 is a solenoid as a drive source, and 10 and 11 are connecting links, which constitute the driving means for the first and second bevel gears.

Next, with reference to FIG. 3, the operation of the thread wiping device according to this embodiment will be described. When the reciprocating rod of the solenoid 9 reciprocates in the arrow A direction, the connecting link 11 and the lever 41 connected to this reciprocate in the arrow B direction. Therefore, the second bevel gear 4 reciprocates in the arrow C direction and reciprocates the first bevel gear 2 in the arrow D direction. Then, the thread wiper 3 is driven by the first bevel gear 2 to reciprocate in the arrow E direction and perform a thread sweeping operation in a predetermined direction.

In order to change the operation direction of the thread wiper 3, the gear base 1 is pushed down against the urging force of the pressure spring 7 and rotated around the outer cylinder 6, that is, around the needle bar 5 to select a desired position. Then, when the downward pressing is released, the gear base 1 is again urged upward by the pressing spring 7, and the tooth portions of the first bevel gear 2 and the second bevel gear 4 are brought into a meshed state. In this way, the operating direction of the thread wiper 3 can be freely set as required around the outer cylinder 6, in other words, around the needle bar 5.

As described above, the movement direction of the thread wiper 3 can be set freely, but the movement direction actually required is limited to a predetermined number of directions, so the gear base 1 can be set in the expected number of directions. If the positioning means is provided to facilitate the setting, the change of the operation direction of the thread wiper 3 becomes extremely easy. 2 and 3, reference numerals 1a and 1a denote a plurality of groove portions formed on the upper surface of the gear stand 1, that is, a surface facing the second bevel gear 4. Reference numeral 42 denotes an outer cylinder for engaging with the groove portions 1a and 1a. 6 is a locating pin formed on the outer peripheral surface of 6. The plurality of groove portions and the positioning pins constitute the positioning means for the gear stand 1. The positions where the grooves 1a, 1a are formed are set depending on the required operation direction of the thread wiper 3.

In order to change the operation direction of the thread wiper 3, the gear base 1 is pushed down by the same procedure as described above, the groove currently engaged with the positioning pin is removed, and the gear base 1 is rotated. The groove portion at another position is engaged with the positioning pin. In this way, the operation direction of the thread wiper 3 can be set accurately and easily.

In the above-mentioned embodiment, the case where both the first and second transmission means are composed of gears has been described. However, one movement can be performed by joining members having a large friction coefficient such as a rubber material. It may be configured to be transmitted to. Further, the contacting / separating means may be composed of the base to which the first transmitting means is attached, and a loosening means for mounting the base on the outer cylinder so that the position can be changed. That is, for example, a through hole is formed in the outer cylinder direction from the outer peripheral surface of the base to screw a set screw, and the set screw is loosened to move the base 1 downward on the outer cylinder 6. By this movement, the joint relationship between the first and second transmission means is released, and the position of the first transmission means is changed during this time, while the base 1 is returned to the original position and the set screw is fastened. The first and second transmission means are set to the joined state again.

[0018]

[Effect of device]

 As described above, the present invention provides, in a thread removing device of a sewing machine, a transmission means for reciprocating the thread removing device, and another transmission means for transmitting the reciprocating motion from the driving means to the transmission means. Since the contacting / separating means for joining and releasing the both is interposed between the two and the joining position of the both transmitting means can be changed, the operation direction of the thread wiper can be freely changed as necessary.

[Brief description of drawings]

FIG. 1 is an external perspective view of a main part of a thread wiping device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the same.

FIG. 3 is an exploded perspective view of a thread wiping device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gear stand 2 1st gear 3 Thread wiping 4 2nd gear 6 Outer cylinder 7 Pressing spring 8 Stopper 1a Groove 42 Positioning pin

Claims (4)

[Scope of utility model registration request] 1. An outer cylinder through which a needle bar penetrates, a first transmission means attached to a base that engages with the outer cylinder, and capable of changing the position in the horizontal direction along the outer circumference of the outer cylinder, and a first transmission means. And a second transmission means which is provided on the outer cylinder and which is always joined to the first transmission means and is reciprocally rotated by a drive means. And a thread removing device for a sewing machine, comprising: a connecting means and a separating means for connecting and disconnecting the second transmission means to each other. 2. The contacting / separating means according to claim 1, wherein
2. A thread wiper for a sewing machine, comprising: the base to which a transmission means is attached; and an elastic body that presses the base and always joins the first transmission means and the second transmission means. 3. The contact / separation means according to claim 1, comprising the base to which the first transmission means is attached, and a loosening means for mounting the base on the outer cylinder so that the position of the base can be changed. A thread removing device for a sewing machine, which is characterized in that 4. The base comprises a positioning means formed of a positioning pin formed on the outer cylinder and a plurality of grooves formed on the base to engage the positioning pin. 3. A thread removing device for a sewing machine according to any one of 3 to 3.