JPH08859A - Button sewing machine - Google Patents

Abstract

(57) [Abstract] [Object] An object of the present invention is to provide a highly safe button sewing machine in which the button and the sewing needle do not interfere with each other when the button holding portion is raised. According to the present invention, a sewing machine main shaft 20 that stops in a rotatable state when a sewing operation is stopped, a sewing needle N that moves up and down as the sewing machine main shaft rotates, a button holding plate 25 that can move up and down, and this button holding. Button clamp leg 2 fixed to a plate
In a button-attached sewing machine including a button holding member composed of 7 and 28, a push-up member 32 fixed to the button holding member so as to project upward, and a push-up member 32 which is fixed to the sewing machine main shaft so as to rotate integrally therewith. The rotating body 31 provided is provided, and the push-up member 32 is raised as the button holding member is raised, and the rotating body is rotated at the upper end of the rotating body to rotate the sewing machine main shaft so that the sewing needle can be raised. It is a thing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine with a button, which is capable of performing a sewing operation while holding a button by a button holding member which can be raised and lowered.

[0002]

2. Description of the Related Art FIGS. 3 to 5 are views showing a button-attached sewing machine which has been generally used conventionally. As shown in the drawing, a pair of button holding legs 2 and 3 are provided above the needle plate 1 so as to be able to move up and down, and a holding portion provided at the tip of the button holding legs 2 and 3 is shown in the figure. The peripheral portion of the button B is sandwiched by the left and right sides by 2a and 3a. Also, these button holding legs 2 and 3 are
The Y drive mechanism allows horizontal movement in the front-rear direction and the left-right direction. When the sewing operation is performed, the held button B is horizontally moved in the left-right direction for each stitch, so that the sewing needle N that moves up and down can be moved. The pair of threading holes Ba, Ba are alternately penetrated, and the button is sewn to the cloth.

Further, in order to automatically supply buttons to the button holding legs 2a and 3a, a button sewing machine BF as shown in FIGS. 4 and 5 is generally attached to the current button sewing machine. There is. Button supply device BF shown here
Means that the buttons B discharged from the button supply source 10 are sequentially transferred to the button discharge position 12 by the disk-shaped transport mechanisms 11 and 12.
The button B conveyed to a and further reaching the button discharge position is sent between the button holding legs 2 and 3 and held by the button holding arm 13 which performs a horizontal arc motion.

A plurality of engaging pins 13a, 13a are vertically projectingly provided at the tip of the button holding arm 13, and the engaging pins 13a, 13a are inserted into the thread inserting holes Ba of the button B, respectively. By inserting it into Ba, the button B falling from the discharge position P1 can be reliably held. Therefore, even when the button B is clamped by the button clamping portions 2 and 3, the positions of the button insertion holes Ba and Ba can always be kept at fixed positions, and the sewing needle N which is performed before the start of the sewing operation can be used. Positioning with the thread insertion holes Ba and Ba can be performed accurately.

Although various button feeders have been proposed other than those using a disc-shaped transport mechanism as described above, any of the button feeders ejects from the transport mechanism. The configuration is the same in that the button is clamped in the clamping portion by the horizontal rotation of the holding arm 13.

[0006]

In the button sewing machine as described above, the button holding legs 2 and 3 are properly raised to a predetermined height before and after the sewing operation, but the sewing needle N is When the allowable stop position P0 shown in FIG. 6 is exceeded and the vehicle is stopped at the positions shown in FIGS. 6A and 6B, the sewing needle N and the button B interfere with each other and the button There was a problem that accidents such as breakage and needle breakage occurred.

For example, when the sewing operation is completed and the cloth W to which the button B is sewn is removed from the needle plate 1, the button holding legs 2 and 3 are raised to the position P1 shown in FIG. 6 (a). However, when the sewing needle N is located below the raised position P1, the button B and the sewing needle N interfere with each other and an accident such as needle breakage may occur. Become. In the case of using the button supply device BF as described above, after the button B is clamped between the button clamping legs 2 and 3, the button clamping legs 2 and 3 are raised to the above-described allowable stop position P0. Since it is necessary to pull out the button B by doing so, the button B and the needle N also interfere with each other if the sewing needle N is located below the allowable stop position P0 in this case as well. In particular, in this case, since the button holding legs 2 and 3 are raised to a position higher than the position P1 at the time of taking out the cloth, the possibility of interference with the sewing needle N becomes higher.

However, if the sewing needle N always stops above the permissible stop position P0 at the end of the sewing operation, the above problem does not occur, but the motor as the drive source of the sewing machine spindle is It is virtually impossible to avoid the variation of the stop position of the sewing needle, because the stop phase slightly changes due to the environmental change (for example, temperature change).

Therefore, in order to completely prevent the occurrence of the above problems, conventionally, an operator stops the sewing machine for each sewing operation to check and correct the needle position. Although the work method is adopted, in this case, a new problem arises that a great burden is imposed on the worker and productivity is significantly reduced.

The present invention has been made in view of the above problems, and an object thereof is to provide a highly safe button sewing machine in which the button and the sewing needle do not interfere with each other when the button holding portion is raised.

[0011]

According to the present invention, a sewing machine main shaft that stops in a rotatable state when a sewing operation is stopped, a needle bar that moves up and down with the rotation of the sewing machine main shaft, and a peripheral surface of a button are sandwiched. In a button-attached sewing machine including a button holding member that has a holding portion and that moves a button within a predetermined lifting range on a needle plate, a push-up member fixed to the button holding member so as to project upward. , A rotating body provided so as to rotate integrally with the main shaft of the sewing machine is provided, and the push-up member is located outside the rotational movement range of the rotating body when the button holding member is in the lowered state, and the button holding The member is formed so as to be located within the rotational movement range of the rotary body when the member is located above the predetermined raised position from the lowered position, and the rotary body is pushed up when the sewing needle is located within the vertical range of the button. In which is located in the pressing range was formed so as to be positioned non-pressing range for the pressing member when the needle is located outside the lift range of the button against.

[0012]

In the present invention, since the button holding member is in the lowered state during the sewing operation and the push-up member is held at the position separated from the rotation path of the rotating body accordingly, the sewing machine spindle is pushed by the push-up member. The rotation of is not hindered. Further, when the button holding member is raised after the sewing operation is stopped and the sewing needle is located below the raising / lowering position of the button, the raised holding member together with the button holding member presses the rotating body. Since the sewing machine main shaft is rotated to raise the sewing needle, both the button holding member and the sewing needle are raised, and the interference between the sewing needle and the button is prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, 20 is a sewing machine arm Ma.
It is a main shaft of a sewing machine which is rotatably housed inside. The sewing machine main shaft 20 is connected to a motor (not shown) and rotates in a fixed direction when the motor is driven, and can rotate freely in both forward and reverse directions when the motor is stopped. Become.

Reference numeral 21 is a needle bar which holds a sewing needle N at its lower end. The needle bar 21 is vertically held by the sewing machine arm Ma, and is connected to the sewing machine main shaft 20 via a needle bar holder 22, a crank rod 23, a counterweight 24, etc., and the sewing machine main shaft 20 rotates. It is designed to move up and down. A button holding plate 25 is rotatably supported on the sewing machine arm Ma by a support shaft 26, and a pair of button holding legs 27 and 28 are attached to the tip end portion thereof. The button holding plate 25 can be raised in two steps from a position (lower position) where the button holding legs 27 and 28 come into contact with the cloth W placed on the upper surface of the needle plate NB by a driving means (not shown). (See FIG. 2).

The button holding legs 27 and 28 are urged by springs (not shown) in such a direction as to be joined to each other and always maintain a constant facing distance. The button holding portions 27 and 28 are formed on the inner side surfaces of the button holding legs 27 and 28, respectively.
The peripheral surface of the button B is sandwiched by a and 28a from both left and right sides. In addition, this button holding leg 2
7, 28 and the button holding plate 25 constitute a button holding member.

Reference numeral 29 is a button holding arm for sending the button discharged from the discharge port of the button supply device to the space between the button holding legs 27 and 28 to hold the button. The button holding arm 29 is a rotary shaft 3 that is rotated by a motor (not shown).
One end is fixed to 0 and a button holding portion 29a is provided on the upper surface of the other end, and a plurality of (here, two) engaging pins 29b and 29b are provided in a protruding manner. When the rotating shaft 30 rotates, the holding portion 29a has an arc shape extending from directly below the discharge port 10a of the button supply device BF (reception position) to directly below the button holding legs 27 and 28 (delivery position). It is designed to move back and forth along the route. In addition, the engagement pin 29b is connected to the holding portion 29.
They are placed symmetrically with respect to the center of
The center of the holding portion 29 is located at the center of the discharge port 10a and the sewing needle N at the receiving position and the delivering position described above.
It is supposed to match the center of each.

Reference numeral 31 denotes a rotating body fixed to the sewing machine main shaft 20, and the rotating body 31 is formed with a flat contact portion 31a which can face the button holding plate 25. 32
Is a plunger (push-up member) supported by the sewing machine arm Ma so as to be able to move up and down through a metal 33, and its lower end portion is always in contact with the upper surface of the button holding plate 25 by its own weight. Therefore, this plunger 32
Moves up and down together with the button holding plate 25, and the upper end of the button holding plate 25 projects in and out of the rotation path R of the rotating body 31. That is, when the button holding plate 25 is in the lowered position, the upper end portion of the plunger 32 has the rotation path R (see FIG. 2).
When the button holding plate 25 is lifted up to a predetermined height, it enters the rotation path R of the rotating body 28.

Further, the rotation path R of the rotating body 31 shown in FIG.
, Β indicates a range in which the upper end of the plunger 32 can press the rotating body 31, and β1 indicates the button holding leg 2
7 and 28 indicate a range (pressable range) in which the plunger 32 can press the rotating body 31 when the first and second lift positions L1 shown in FIG.
The respective ranges (second pressable range) in which the plunger 32 can press the rotating body 31 when 28 is moved up to the second lifted position L2 are shown. Further, in FIG. 2, α indicates a range in which the upper end of the plunger 32 cannot press the rotating body 31 (non-pressable range).

In this embodiment, various button supply devices for discharging the button to the button holding arm 29 can be applied, but here, the same as those shown in the above-mentioned prior art. I use the one.

In this embodiment constructed as described above, when the sewing operation of the button is completed, the sewing machine motor is stopped after a predetermined time lag based on a signal output from a control device (not shown) or the like. Accordingly, the sewing machine main shaft 20 also stops in a rotatable state. At this time, the above-mentioned time lag is
Since the temperature slightly changes depending on the surrounding temperature of the sewing machine motor, an error also occurs in the stop position of the sewing needle due to the change, and in some cases, the sewing needle N is below the raised position of the button holding legs 27 and 28. It may stop.

Therefore, when the button holding plate 25 is raised while holding the sewing needle N at the position at the end of the sewing operation,
As in the prior art described above, the button B held by the button holding legs 27, 28 collides with the sewing needle N and breaks,
An accident such as breakage of the button will occur, but in this embodiment, the button B and the sewing needle N are raised by raising the button holding legs 27 and 28 regardless of the position of the sewing needle N.
It is possible to avoid interference with.

That is, as shown in FIG. 2A, with the sewing needle N below the first raised position L1 of the button holding legs 27, 28, the cloth W after the sewing operation is taken out. Therefore, the button holding plate 25 and the button holding leg 27,
When 28 is raised from the lowered position to the first raised position L1, the plunger 32 rises together with the button holding plate 25, and the upper end portion of the plunger 32 falls within the first pressable range β1 in the rotation path R of the rotating body 31. Enter the contact portion 3 of the rotating body 31
1a is pushed up and the sewing machine main shaft 20 is rotated together with the rotating body 31 to raise the sewing needle N. As a result, the sewing needle N and the button B rise together while keeping a predetermined distance from each other,
Interference between the two is avoided.

At the end of the sewing operation, the sewing needle N
Is located above the first raised position L1, the plunger 32 does not contact the rotating body 31 even if the button holding legs 27 and 28 are raised to take out the cloth, so that the sewing machine main shaft 20 is Does not rotate. Of course, in this case, the sewing needle N and the button B do not interfere with each other.

Further, when the sewing needle N is located between the first raised position L1 and the second raised position L2, the button holding leg 2 for pulling the engagement pin 29b from the button B is pulled out.
Assuming that 7, 28 are raised from the first position L1 to the second position L2, the plunger 32 enters the second pressable range β2 and pushes up the contact portion 31a of the rotating body 31 to lift the sewing machine spindle 20. Is rotated to raise the sewing needle N, the sewing needle N and the button holding legs 27 and 28 are raised together while maintaining a predetermined distance, and the interference between the button B and the sewing needle N is avoided. Further, during the sewing operation, the plunger 32 is in the lowered state together with the button holding plates 27 and 28, and the upper end of the plunger 32 is disengaged below the rotation path R of the rotating body 31, so that the rotation of the sewing machine main shaft 20 is prevented.
The proper sewing operation is executed without being hindered by 2.

In the above embodiment, the lower end of the plunger 32 is always joined to the upper surface of the button holding plate 25 by its own weight, but the lower end of the plunger 32 is held by the biasing means such as a spring. It may be forcibly pressed against the plate 25. Further, the lower end of the plunger and the upper surface of the button holding plate may be pivotally attached, or the lower end of the plunger 32 and the button holding plate 25 may be integrated. However, the present invention is not particularly limited to the above embodiment.

[0026]

As described above, the button sewing machine according to the present invention raises the button holding leg even if the sewing needle stops below the raised position of the button holding leg when the sewing operation is stopped. When the button is clamped, the presser foot lifting member that rises together with the button clamp leg presses the rotating body fixed to the sewing machine spindle to rotate the sewing machine spindle and raise the sewing needle, so the button and sewing needle do not interfere with each other. The occurrence of button breakage, needle breakage, etc. can be greatly reduced, and the safety of the sewing machine is dramatically improved. Further, even when a button supply device or the like is used, the sewing operation can be continuously performed according to the button supply operation, so that the productivity can be remarkably improved and the burden on the operator is significantly reduced. To be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of the present invention.

FIG. 2 is an explanatory side view showing a relationship between a rotating body and a plunger, and a sewing needle and a button holding member in the same embodiment, FIG. 2A shows a case where the rotating body is located within a second pressable range. , (B) show the case where the rotary body is located within the first pressable range, and (c) shows the case where the rotary body is located within the non-pressable range.

FIG. 3 is a perspective view showing the vicinity of a sutured portion of a conventional button sewing machine.

FIG. 4 is a plan view showing a conventional button sewing machine and a button supply device installed therein.

FIG. 5 is a side view of what is shown in FIG.

FIG. 6 is a schematic side view of what is shown in FIG. 3, (a)
Shows the state when the sewing needle is at the proper lowering position, and (b) shows the state where the sewing needle is located below the proper lowering position.

[Explanation of symbols] 20 sewing machine spindle 25 button holding plate 27, 28 button holding leg 32 plunger (pushing member) 31 rotating body N needle bar B button Ba button insertion hole NB needle plate R rotational movement range β pressable range α non Pressable range

Claims (1)

[Claims] 1. A sewing machine spindle that rotates in a fixed direction during a sewing operation and stops in a rotatable state when a sewing operation is stopped, a needle bar that moves up and down as the sewing machine spindle rotates, and a peripheral surface of a button are clamped. And a button holding member that is held so as to be able to move up and down above the needle plate and that can move the button held by the holding portion within a predetermined lifting range, and is held by the button holding member. By horizontally moving the button and the sewing needle relative to each other one by one, the sewing needle is alternately pierced into the pair of sewing thread insertion holes of the button held in the sandwiching portion so that the button is sewn to the cloth. In the button-attached sewing machine, the push-up member provided to the button holding member so as to project upward, and the rotating body provided to the sewing machine main shaft so as to rotate integrally with the push-up member, The push-up member is formed so as to be located outside the rotational movement range of the rotary body when the button holding member is in the lowered state, and located within the rotational movement range of the rotary body when the button holding member is in the raised state, The rotating body is located within a range where the sewing needle can be pressed against the lifting member when the sewing needle is located within the up and down range of the button, and is located within a non-pressable range where the sewing needle is located outside the up and down range of the button. When the sewing needle stops within the range of raising and lowering the button, the push-up member pushes the rotating body by rotating the sewing machine main shaft by raising the button holding member, and the sewing needle moves up and down the button holding member. A sewing machine with buttons, which is characterized by raising it to outside the range.