JP2575577Y2 - Sewing machine with tape feeder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine equipped with a tape supply device for sewing a tape such as rubber on the waist of a swimsuit or pants and a hem of a leg.

[0002]

2. Description of the Related Art In a sewing machine with a tape supply device, it is sometimes necessary to selectively use a plurality of tapes of different types. For example, the pants portion of a women's separate swimsuit is such that a wide rubber tape is sewn on a waist portion and a thin rubber tape is sewn on a hem portion of a leg hole.

[0003] Such a rubber tape sewing operation is performed by guiding a rubber tape under a presser foot of the sewing machine from a rubber tape supply device attached to the sewing machine. The sewing operation of the waist rubber and the hem rubber is continuously performed by the same sewing machine. In each case, it is necessary to remove the tape from the tape supply device and replace it with a new tape, and this replacement work takes a considerable amount of time and labor, and the work efficiency cannot be improved.

In order to improve the work efficiency at the time of tape switching, Japanese Patent Publication No. 2-62274 discloses a support arm which is supported on the front surface of a sewing machine so as to be able to tilt back and forth, and which is pivotally supported at the lower end of the support arm. and a positive or tape feed roller which is rotated in the reverse direction, before and after the feed roller, the first and second pressing roller pivotally attached to the pivot plate pivotally supported on the support arm, wider than the tape of narrow On the tape
Or conversely, when switching to a narrower tape than a wide tape, tilt the support arm forward or backward,
In addition, the rotation plate is rotated by the operation of the air cylinder, and the first pressing roller is pressed against the supply roller, thereby sandwiching one of the tapes and separating the second pressing roller from the supply roller so that the other one has a different width. A tape feeder that feeds the one tape from between the first pressing roller and the supply roller by rotating the supply roller in a forward or reverse direction by a motor and supplying the tape under the presser foot. Proposed.

Japanese Patent Application Laid-Open No. 1-13587 discloses that a first and a second tape pressing roller are connected to a pull-out roller provided above a tape feed roller, and the tape used by one of the pressing rollers at the time of tape switching. A tape supply switching device has been proposed in which the tape is fed by being pulled out and pressed against a roller, while the other pressing roller is pulled away from the drawer roller to make unused tape free.

However, in the former switching device, the support arm and the rotating plate for supporting each roller are largely tilted toward the front when the tape is switched. Due to the rollers, the field of view to the sewn portion is obstructed, and there is a problem in that it is difficult to confirm the state of introduction of the tape under the presser foot and the position of the sewn body material.

[0007] In the latter switching device, the above-mentioned problem is small, but when the tape is switched, the unused tape is fed to the tape feed roller so that the unused tape is not supplied under the presser foot together with the used tape. It has to be pulled up, and the work for that must be done, which lowers the work efficiency, and the supply position differs depending on the tape, so that it cannot be supplied at a fixed position.

In a sewing machine for sewing a tape such as rubber, as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 1-13587, or in Japanese Utility Model Publication No. 54-6604, WO90 / 076.
As shown in No. 03, there is known a device provided with a tape cutting device for cutting a sewn tape.

[0009]

SUMMARY OF THE INVENTION A first object of the present invention is to provide a sewing machine provided with a tape supply switching device capable of appropriately switching different types of tape and supplying the tape under a presser foot of the sewing machine. So that the tape is not interrupted, and the time required to remove the tape not used at the time of tape switching from the tape feed roller is eliminated, and the tape can be supplied at a fixed position. The switching operation is automatically performed to improve the operation efficiency of the tape switching.

[0010] In a sewing machine with a tape supply device, when the tape is cut at the end of sewing, the tape is cut above the presser foot. It is desired that the tape be cut nearby and the portion to be sewn after cutting be as short as possible. The rubber tape sewn to the waist or the hem of the underbody is sewn in a stretched state, and after the sewn, the rubber tape shrinks to create gathers in the body fabric, giving elasticity to the waist etc. However, if the rubber tape is cut away from the needle drop above the presser foot, immediately after cutting, the cut end of the free rubber tape shrinks to the presser foot side and the non-stretchable tape is simply sewn. This is because the sewn product having the elasticity over the entire circumference cannot be obtained.

However, the tape cannot be cut near the needle drop without damaging the body material. Therefore, the tape must be cut near the presser foot. However, even if the tape cutting device is provided near the presser foot, it is necessary to prevent the presser foot from being lifted. Therefore, a second object of the present invention is to provide a cutting device at a position where the lifting of the presser foot above the presser foot is not hindered, and when cutting the tape, sew the contracted tape as close as possible to the presser foot. They try to reduce the parts.

[0012]

In order to achieve the first object, a sewing machine with a tape feeding device is capable of using tapes of different types.
First and second tape guides for individually guiding,
Between the guide and the presser foot of the sewing machine.
The other is driven to rotate by a motor and the tape
A pair of tapes that send out the tape guided by the guide
A supply roller, and a roller provided between the supply roller and the presser foot.
Machine with a tape cutting device that cuts the tape.
In the above, at least one of the pair of tape supply rollers
In addition to providing a large diameter part and a small diameter part on one roller,
An opening / closing device for opening and closing the supply roller is provided.
With the tape supply roller opened, the first and second tapes are opened.
The exit of one of the tape guides is tape
The exit of the tape guide on the large diameter side of the supply roller is small.
The first and second tape guides so as to face the radial side.
Actuated and guided by the first and second tape guides
The direction of the tape is switched by the opening / closing device.
With the supply roller closed, close to the small diameter side of the tape supply roller.
A tape supply switching device for setting a positioned tape to a free state is provided.

In other words , when the tape is switched by the tape supply switching device, the gap between the two tape supply rollers is opened by the opening / closing device, and then the first and second tape guides are operated. After switching to the large-diameter portion of the tape supply roller so that the other outlet is directed to the small-diameter portion, the opening and closing device is used to close the gap between the tape supply rollers. The tape passed through the switched tape guide is nipped by the large-diameter portion of the supply roller, fed out by driving the supply roller, and supplied under the presser foot.

On the other hand, the tape that passes through the tape guide whose outlet is switched to the small-diameter portion side of the tape supply roller passes through the gap between the tape supply rollers formed by the small-diameter portion, and is in a free state to supply the tape. Even if the roller is driven, it is not sent out. According to the present apparatus, as described above, when the tape is switched, one tape is always fed out from a fixed position between the large diameter portions of the tape supply roller, and the other tape is free.

In this apparatus, the tape supply switching device comprises a switching device for operating a first tape guide and a switching device for operating a second tape guide.
May be operated individually, but preferably, the first and second tape drive units are driven by one switching drive device.
It is desirable to operate the tape guides simultaneously in opposite directions so that the exit direction can be switched simultaneously.

Therefore, in one preferred example, the tape supply
A feed switching device includes an air cylinder having pins protruding to both sides at a rod end, and first and second air bearings rotatably supported on a shaft and having first and second tape guides respectively attached thereto. A bracket, a long groove or a long hole formed in one bracket intersecting the path on one side of a path where the pin advances and retreats, and intersecting the path on the other side with the other bracket interposing the above path. The bracket is constituted by a long groove or a long hole formed, and both brackets are rotated in opposite directions by the advance and retreat of the pin so that the tape guide is switched.

In this switching device, instead of forming the long groove or the long hole in the bracket, it may be formed in the plate attached to the rod end, and the pin may be formed in the bracket instead of providing the pin at the rod end. In another preferred example, the switching device includes a pair of arms that are opened and closed by the operation of an air cylinder, and a first and second arms rotatably supported by a shaft.
Opening and closing of both arms, the first and second brackets to which the tape guides are attached, a concave groove formed in one of the arm and the bracket, and a pin protruding from the other and fitted into the concave groove. As a result, both brackets rotate in opposite directions to switch the tape guide.

In still another preferred embodiment, the switching device is rotatably supported by a shaft and is always urged by a spring in one rotation direction, and is provided with a bracket to which the first and second brackets are fixed. And an air cylinder for rotating the bracket in the opposite direction against the action of the spring, and the tape guide is switched by rotating the bracket with the air cylinder.

As described above, the first and second tape guides are switched in the direction orthogonal to the cloth feed. However, the standby of the tape guide through which the unused tape is passed is preferably performed by the sewing machine. It is desirable that the processing be performed on the right side of the arm base. Since the tape guide does not protrude to the outside (left side) of the sewing machine, there is a problem in sewing work even at the time of overturn sewing in which the tubular fabric is sewn sequentially in one direction above the presser foot. Because there is no.

It is desirable that the tape supply roller has a conical tapered portion between the large diameter portion and the small diameter portion so that the tape can move smoothly along the tapered portion. A sewing machine with a tape supply device for achieving the second object is provided with a tape supply device, wherein the tape fed from the device can be supplied under a presser foot of the sewing machine.
A tape cutting device including a pair of blades, at least one of which is a movable blade, is provided at a position where the lifting of the presser foot above the presser foot is not hindered, and the tape is passed between the opened blades. In cutting, the blade is lowered or tilted downward near the presser while the tape is passed between the blades .

According to the present invention, since the tape is cut as close as possible to the presser foot, it is possible to reduce the length of the tape that has become free immediately after cutting , and the tape is always used.
Since it is passed between the blades, change the presser foot and
Adjust the position of the cutting device even if the tape position changes
Tape can be reliably cut without the need. The tape cutting device according to the present invention can be used for the above-described sewing machine in which different types of tapes can be appropriately switched and supplied under the presser foot, or can be used for a general sewing machine having a tape supply device.

[0022]

FIG. 1 is a front view of an apparatus including a tape supply switching device of a sewing machine according to the present invention, and FIG. 2 is a perspective view of a main part of the device.
Is broad as a second tape guide that is fixed to the first narrow tape guide cylinder 17 as a tape guide which is fixed to the first bracket 15, the second Burake <br/> Tsu DOO 19 Between the tape guide tube 21 and the first and second tape guides.
It has an air cylinder 33 for switching, and the guide cylinders 17 and 21 each have a C-shaped cross section so that the tape can be easily inserted.

Each of the first and second brackets 15 and 19 is a flat plate, and is rotatably mounted on covers 23 and 25 by shafts 27 and 29, respectively. The cover 23 is fixed to a frame 31 fixed to the sewing machine. And the cover 25 is hinged to the frame 31 to rotate the second bracket 19 between a closed position facing the first bracket 15 and a position opened toward the user. I can do it.

As shown in FIGS. 4 and 5, the first and second brackets 15 and 19 are provided so as to protrude laterally from both side surfaces of the block 35 fixed to the rod end of the air cylinder 33. A long hole 39 that intersects with the movement path in which the pin 37 advances and retreats and that is inclined upward or downward.
The pin 37 is slidably fitted in the long holes 39 and 41 of the brackets 15 and 19, respectively, and the brackets 15 and 19 are moved forward and backward by the operation of the air cylinder 33. Is axis 2
The guide tubes 17 and 21 are rotated in opposite directions about 7 and 29 so that the guide tubes 17 and 21 can be switched between a vertical position and a standby position inclined to the right side (arm base side) as shown in the figure.

Below the narrow and wide tape guide cylinders 17 and 21 as the first and second tape guides , a pair of tape supply rollers 43 and 45 are provided in a cantilever manner. 43 and 45, the large-diameter portions 43A and 45A for feeding the tape and the small-diameter portions 43B and 4B on the base side.
5B and conical tapered portions 43C and 45C formed between the large-diameter portion and the small-diameter portion in order to smoothly move the tape from the small-diameter portion to the large-diameter portion. A pulley 47 is fixed on an extension of the small diameter portion 43B, and is driven to rotate by a pulse motor 51 via a belt 49.

On the other hand , in order to open and close the space between the tape supply roller 43 and the tape supply roller 45 by rotating the tape supply roller 45, FIG.
Closing apparatus as shown in, i.e. is axially supported pivotably by the shaft 53, always biased to pivot downwardly by the spring 55, and can rotate the tape feed roller 45
An arm 57 you journaled to the position under the free end of the arm 57
An opening / closing device including a release pin 61 which moves up and down by the operation of the air cylinder 59 is provided.
9 , the arm 57 pivots downward by the action of the spring 55, causing the tape supply roller 45 to elastically contact the tape supply roller 43. When the release pin 61 is raised, the arm 57 Is lifted against the action of the spring 55 and the tape supply roller 45
Are separated from the tape supply roller 43.

Above the tape supply rollers 43 and 45
The tape handling 11 and 13 through which the tape is passed
Are provided one after the other (see Fig. 1
A third tape guide 62 is further provided below the tape supply rollers 43 and 45 , and a tape cutting device is provided between the third tape guide 62 and a lower presser (described later). As shown in FIGS. 7 to 9, the tape cutting device includes a fixed blade 65 fixed to a scalpel bracket 63, a movable blade 69 pivotally mounted on the fixed blade 65 with a pin 67, and a link 71. An air cylinder 73 connected to the movable blade 69 and fixed to the female bracket 63;
The fixed blade 65 and the movable blade 69 are tilted upward when the blade 3 is not operating, as shown in FIG. When the tape is cut, as shown in FIG. 9, the air cylinder 77 is turned to be horizontal by the operation of the air cylinder 77, and the tape is cut close to a presser foot to be described later.

As shown in FIGS. 10 and 11, the presser foot 79 is provided with a tape guide 85 having two inlets 81 and 83 having different widths at the end thereof. At 81 and 83, air supply pipes 86 and 87 provided with air outlets obliquely downward are respectively arranged along the respective inlets, and the tape T is introduced into the inlets 81 or 83 by blowing air from the outlets. It can be introduced to.

An air supply pipe 89 for blowing air to the tape is also arranged below the needle plate 91, and blows air blown from an upward outlet to the tape T passed through the inlet. The introduction of the tape T under the presser foot is promoted. In the figure, 92 is a feed dog. FIG. 12 shows a time chart when rubberization work of, for example, women's swim pants is performed using the above-described device. In this case, first, as a rubberization order, a wide rubber tape is sewn to a waist portion. Then, a narrow rubber tape is sewn to the hem of both legs.

FIG. 13 shows the guide cylinder 1 at the time of tape switching.
7, 21, tape supply rollers 43, 45, and tape cutting
Shows the relationship between the cross-sectional device, when applying the rubber tape T ₁ of the wide waist sewing the guide tube 2 facing the vertical direction
Rubber tape T ₁ which is unwound from 1 supply roller 43,4
5 is pulled out by the large-diameter portions 43A and 45A, and the tape is cut.
While fed under the presser foot passes between the fixed blade 65 and movable blade 69 of the device, the rubber tape T ₂ is the small-diameter portion 43B of the narrow that dispensed from the guide tube 17 in the standby position, located between 45B And is in a free state (A).

When switching tapes, first, FIG.
As shown in FIG. 9, the operation of the air cylinder 77 lowers the tape cutting device from an upwardly inclined state to a horizontal position, and then the operation of the air cylinder 73 shown in FIG. Rollers 43, 4
The tape T ₁ passing between the large diameter portion of the 5 cooperates with the fixed blade 65 to cut (B). After cutting, the tape cutting device immediately rotates upward after the movable blade 69 is opened, and returns to the original position. At the same time, the release pin 61 is lifted by the operation of the air cylinder 59 shown in FIG. 6 to rotate the arm 57 around the shaft 53 upward against the action of the spring 55, and the tape supply roller 45 is Separate and open both supply rollers.

Next, by operating the air cylinder 33 shown in FIGS. 4 and 5, the first and second brackets 15 and 19 are rotated in opposite directions about the shafts 27 and 29, respectively, so that the first tape guides are formed. The guide tube 17 serving as a second tape guide is switched to the standby position, and the guide tube 21 serving as a second tape guide is switched to the standby position to feed the wide tape T ₁ to the tape supply roller 4.
The small diameter portion side between 3 and 45, after interchanged tape T ₂ of the narrow to the large diameter portion, lowering the release pin 61 by actuation of air cylinder 59. Accordingly, the arm 57 rotates downward around the shaft 53 by the action of the spring 59, and presses the tape supply roller 45 against the tape supply roller 43.
To sandwiched the tape T ₂ of the narrow.

The wide-width tape T ₁ fed from the guide cylinder 21 switched to the standby position passes through the small-diameter portion between the tape supply rollers and enters a free state (C). When driven to rotate by a pulse motor 51 showing the tape feed roller 43 in FIG. 2 in this state, so that the tape T ₂ of the narrow is supplied under presser foot. When switching the supply of tape to the tape T ₁ of the wide width, after cutting the tape T ₂ of the narrow (D), as described above, performs the replacement of the tape to open the inter-tape supply roller, between the tape feed roller Close (A).

FIG. 14 shows another example of the tape supply switching device , wherein the tape supply switching device comprises a first tape cartridge.
A bracket 95 which is fixed a wide tape guide cylinder 93 as id, a bracket 99 which is fixed the second narrow guide tube 97 for the tape as the tape guides, the switching of both the guide tube
It has an air cylinder 105 for changing
The brackets 95 and 99 are rotatably supported by shafts, respectively, and have concave grooves 101 formed in the brackets 95 and 99, respectively.
And 103 are fitted with pins 111 and 113 projecting in opposite directions to the ends of a pair of arms 107 and 109 which open and close by the operation of the air cylinder 105, and the brackets are opened and closed by the arms 107 and 109 by the operation of the air cylinder 105. 95, 99 are rotated in the opposite direction, and the guide cylinder 9 is rotated.
3 and the guide cylinder 97 are switched to the positions shown in FIG. 15 or FIG.

FIG. 17 shows still another example of the tape supply switching device. The tape supply switching device is rotatably supported by a support bracket 115 and has a guide tape for a wide tape.
119 and the narrow tape guide tube 121 are crossed and fixed.
A bracket 117, a spring 123 that biases the upwardly rotating the bracket 117, support bracket 1
15 and the bracket 1 against the action of the spring.
17 that pushes down the air cylinder 17.
Guide cylinder 1 for wide tape by operation of A cylinder 125
19 and FIG. 19 or FIG.
The position can be switched to the position shown in FIG.

[0036]

[Effects of the Invention] The present invention is configured as described above, and has the following effects. According to the sewing machine of the first aspect, the tape is switched only by operating the first and second tape guides by the tape supply switching device and directing the outlets toward the large diameter portion or the small diameter portion of the tape supply roller. This eliminates the need to remove the tape from the tape supply roller or supply the tape at the fixed position.This improves the efficiency of tape switching, and allows the tape supply roller to be paired. just provided, no Rukoto Deppa the front feed roller in the tape switching is have dynamic back and forth
Since there is little or no obstruction, obstruction when handling the cloth or viewing the tip of the presser foot is reduced, and the trouble for the sewing operation is reduced.

As in the sewing machine according to claims 2 to 4 ,
If the switching between the first and second tape guides can be performed by one switching drive device, the structure of the tape supply switching device can be simplified. If a conical tapered portion is provided between the large diameter portion and the small diameter portion as in the tape supply roller according to the fifth aspect , the tape can smoothly move along the tapered portion.

According to the sewing machine of the sixth aspect , since the tape can be cut close to the presser foot, the sewn portion of the tape after cutting can be shortened. The sewn portion of the contracted tape is reduced, and a product having elasticity over almost the entire circumference of the body material can be obtained. Also change the presser foot to the presser foot
Even if the tape insertion position may change,
The cutting device is always passed between the blades,
It is possible to reliably cut the tape without performing it.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus including a tape supply switching device.

FIG. 2 is a perspective view of a main part of the apparatus.

FIG. 3 is a perspective view of a tape supply switching device.

FIG. 4 is a front view of the tape supply switching device when switching to a narrow tape.

FIG. 5 is a front view of the tape supply switching device when switching to a wide tape.

FIG. 6 is a perspective view of a device that opens and closes a tape supply roller.

FIG. 7 is a plan view of a main part of the tape cutting device.

FIG. 8 is a front view when the device is not used.

FIG. 9 is a front view of the apparatus when it is cut.

FIG. 10 is a perspective view of a presser foot.

FIG. 11 is a partial cross-sectional side view near the presser foot.

FIG. 12 is a time chart at the time of rubberization work.

FIG. 13 is a diagram showing a relationship among a guide cylinder, a tape supply roller, and a tape cutter at the time of tape switching.

FIG. 14 is a perspective view showing another example of the tape supply switching device.

FIG. 15 is a front view of the same device when switching to a narrow tape.

FIG. 16 is a front view of the device when switching to a wide tape.

FIG. 17 is a perspective view showing still another example of the tape supply switching device.

FIG. 18 is a front view of the apparatus when switching to a narrow tape.

FIG. 19 is a front view of the same device when switching to a wide tape.

[Explanation of symbols]

15, 19, 95, 99, 117: bracket 17, 21, 93, 97, 119, 121: guide tube 23, 25: cover 31: frame 33, 59, 73, 105, 125 ... Air cylinder 37 ... Pins 39, 41 ...
Slots 43, 45 Tape supply roller 51 Pulse motor 55, 123 Spring 57, 107
109 arm 61 release pin 63 female bracket 65 fixed blade 69 movable blade 79 presser 81, 83
・ Introduction port 85 ・ ・ ・ Tape guides 86, 87, 8
9 ... air supply pipe 91 ... needle plate 115 ... support bracket

Claims (6)

(57) [Scope of request for utility model registration] 1. A first method for individually guiding different types of tapes.
And a second tape guide, and the tape guide and the sewing machine.
Between the presser foot and at least one
And is guided by the tape guide.
A pair of tape supply rollers for feeding the tape,
Supplied between feed roller and presser foot to cut tape
In a sewing machine having a tape cutting device, the pair of
Large diameter for at least one of the roll supply rollers
Section and a small diameter section, and open and close the tape supply roller.
Opening and closing device, and a tape supply roller is provided by the opening and closing device.
With one of the first and second tape guides open.
The exit of the tape guide is the large diameter part of the tape supply roller
So that the exit of the other tape guide faces the small diameter side
Activating the first and second tape guides to make the first and second tape guides
Cut the direction of the tape guided by the second tape guide
Replace the tape supply roller with the opening and closing device
The tape located on the small diameter side of the tape supply roller
A sewing machine with a tape supply device , comprising a tape supply switching device for setting a tape supply state . 2. The tape supply switching device according to claim 1, wherein said tape supply switching device is rotatably supported on a shaft by an air cylinder having a pin protruding from both sides at a rod end, and first and second tape guides are respectively mounted on said air cylinder. First and second brackets, a long groove or slot formed in one bracket on one side of the path where the pins advance and retreat, intersecting the path, and the other bracket sandwiching the path in the other bracket. 2. The sewing machine with a tape supply device according to claim 1, wherein the sewing machine comprises a long groove or a long hole formed to intersect the path. 3. The tape supply switching device comprises a pair of arms which are opened and closed by the operation of an air cylinder, and a first and a second tape guides rotatably supported on a shaft and having first and second tape guides respectively attached thereto. The sewing machine with a tape supply device according to claim 1, comprising a second bracket, a concave groove formed in one of the arm and the bracket, and a pin protruding from the other and fitted into the concave groove. 4. The tape supply switching device according to claim 1 ,
First and second tape guides with first and second tape guides attached
The bracket is rotatably supported by a shaft, and is always urged in a single rotation direction by a spring. The bracket to which the first and second brackets are fixed and the bracket are inverted against the action of the spring. The sewing machine with a tape supply device according to claim 1, further comprising an air cylinder that rotates in a direction. 5. The sewing machine with a tape supply device according to claim 1, wherein the tape supply roller has a conical tapered portion between the large diameter portion and the small diameter portion. 6. A sewing machine provided with a tape supply device, wherein at least one of the pair of movable blades is a movable blade , wherein a tape fed from the device can be supplied under a presser foot of the sewing machine.
A tape cutting device consisting of blades is provided at a position above the presser foot that does not hinder the lifting of the presser foot.
While cutting the tape, and pass the tape between the blades when cutting the tape.
A sewing machine with a tape supply device , wherein the blade is lowered or tilted downward near the presser foot in a state where the blade is set .