JPH06142375A - Sewing machine for sewing on strip body - Google Patents

Abstract

PURPOSE:To achieve the high efficiency of sewing work of a strip body by receiving the qverlapping portion of a sewn-on strip body returning onto a sewing machine bed together with the sewing starting end and a strip body before sewing surely in the lower part of a holder to automate the whole processes including the process of sewing on the overlapping portion. CONSTITUTION:The return of a first sewing end A of a texture K onto a sewing machine bed 1a is detected by a sewing starting end sensor to raise a holder 11 a little according to the detection. Then, the holder 11 is inclined by a spring force of a coiled spring 11a with the front edge on the upside and restriced on the rear edge side in an intermediate position keeping contact with a needle plate 12. Thus, an overlapping portion of a rubber strip R sewn on the sewing starting end A and the strip body before sewing is received reasonably in the lower part of the holder 11 so that the sewing-on is surely carried out by a needle 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine for band sewing, which is used to sew a band on a peripheral edge of a mouth of a sewing material by appropriately overlapping the bands.

[0002]

2. Description of the Related Art In the manufacture of briefs and the like in recent years, it is widely practiced to sew a wide band of rubber directly to the periphery of a cylinder mouth to be a waist part after finishing the whole sewing process. Has been done. When sewing such lace rubber, the band-shaped rubber is preliminarily formed into an annular shape to form a rubber ring, which is applied to the tubular sewing machine bed with appropriate tension applied, and needle is dropped together with the material. To the position, and a rubber strip (rubber band) is sent from above the sewing machine bed to the needle drop position, and separately from this, along the sewing machine bed to the edge of the mouth of the material that is fed to the needle drop position. The method of overlapping and sewing is adopted.

In the latter method, a dedicated feeding device (rubber feeding device) for nipping and feeding a rubber band by a feeding roller is provided in front of the needle drop position above the sewing machine bed, and the rubber feeding device is used continuously. The rubber band sent to the sewing machine is laid on the edge of the cylinder mouth of the sewing material, and the two are sewn together by holding the two together with a presser until the sewing start ends of both of them return to the needle drop position. It is carried out by a continuous procedure.

The feeding speed of the rubber band can be appropriately set by adjusting the speed of a pulse motor that rotationally drives the feed roller. With this setting, the rubber band is fed to the needle drop position with a constant tension. Be sewn on the fabric. Prior to the return of the sewing start end, this rubber band is cut a predetermined length before the needle drop position, sewn to the restored sewing start end for an appropriate length, and finally sewn to each other. Remove the rubber band and cloth from the sewing machine bed,
Furthermore, the rubber attaching work is completed by stitching together the edges of the rubber bands on the sewing start side and the sewing end side.

[0005]

The latter method, which is carried out as described above, does not require the time and effort of the molding when compared with the former method, which is premised on the molding of a rubber ring, and the sewing machine bed. It is not necessary to bridge the rubber ring, the handling as a rubber band is more advantageous than the handling as a rubber ring, and moreover, it is possible to flexibly deal with tube openings of different sizes. While it has many advantages such as being present, it has the following drawbacks.

That is, at the final stage of the above-mentioned sewing, the rubber band cut at the exit side of the rubber feeding device is superposed on the rubber band previously sewn at the sewing start end which returns to the needle drop position. As a result of being fed to the lower part of the presser foot, these tend to be clogged with the front edge of the presser foot, and excessive clamping pressure is applied by the presser foot, which causes a problem that normal sewing of the overlapping portion is hindered. This difficulty is remarkable when the thickness of the rubber band to be sewn is large, and can be eliminated by setting a small clamping pressure by the presser foot, but in this case, when sewing other than the overlapping part, On the contrary, lack of pressure causes new and more serious problems.

Therefore, in the conventional art, the operation of the sewing machine is temporarily stopped immediately before the return of the sewing start end, the clamping pressure of the material and the rubber band by the presser is released, the material is manually pressed, and the sewing machine is operated at a low speed. Meanwhile, the overlapping portions are sewn, and this complicated manual work leads to a decrease in the efficiency of the entire rubber band sewing work.

The above problems are not limited to the case where the rubber band is sewn on the edge of the tube mouth of the cloth, and the band which is fed from above the sewing machine bed is sewn by the operation of the dedicated feeding device such as the rubber feeding device. This is a problem common to all sewing machines targeted for.

The present invention has been made in view of the above circumstances, and realizes reliable reception of the overlapped portion to the lower portion of the presser foot at the end of sewing without causing a lack of clamping pressure during normal operation and sewing. It is an object of the present invention to provide a sewing machine for sewing a band that can contribute to higher efficiency of the attaching work.

[0010]

SUMMARY OF THE INVENTION A sewing machine for sewing a belt according to the present invention is capable of feeding a cloth having a tubular mouth to a needle drop position along a sewing machine bed and at the same time by operating a dedicated feeding device. The band having the above is fed from above the sewing machine bed to the needle drop position, the band is overlapped on the end edge of the tube mouth, and the operation of sewing while holding the clamping pressure by the presser foot,
Before the sewing start ends of both of them return to the needle entry position, cut the band, and sew an appropriate length to the restored sewing start end to complete the sewing operation. Means for detecting the return of the sewing machine through the existence of the band body sewn at the sewing start end, and the sewn belt body which operates in response to the detection and returns together with the sewing start end by the feeding device. And a presser foot lifting means for raising the presser foot by a predetermined amount so that the presser foot can be received together with the band.

[0011]

In the present invention, a sewing start end sensor for detecting the return of the sewing start end to the needle drop position is provided, and the presser foot is raised at a predetermined timing according to the detection by this sensor, and the clamping pressure during normal operation is increased. Restrains the position slightly moved up from the position, accepts the overlapped part of the band without jamming at the leading edge, and enables reliable sewing at the end of sewing without manual work .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a front view of a sewing machine for sewing a band according to the present invention. In the figure, 1 is a sewing machine main body, and 1a is a sewing machine bed. The sewing machine main body 1 is provided with a sewing machine arm 1b extending parallel to the upper surface of the sewing machine bed 1a. At the tip of the sewing machine arm 1b, there are needles 10 (see FIG. 3) and needle drop holes corresponding to them. And a presser foot 11 (see FIG. 2 and FIG. 3) having the above are suspended downward toward the sewing machine bed 1a.

Between the sewing machine bed 1a and the sewing machine arm 1b, a belt feeding device 2, a material edge control device 3, and an auxiliary feeding device 4 (see FIG. 6) are mounted together as a base.
It is installed with 1c. One side of the base 1c is the sewing machine main body 1
Is rotatably supported on a bracket 1d fixed to the front of the machine around a substantially vertical axis, and the other side is also a sewing machine arm.
It is screwed and fixed to a bracket 1e fixed to the front surface of the tip side of 1b. That is, the base 1c can be pulled out to the front side of the sewing machine body 1 by rotating the bracket 1d around the pivot when the set screw for the bracket 1e is removed, and the band feeding device 2, the material edge control device 3, and Adjustment and maintenance of the auxiliary feeding device 4 are performed by pulling out the base 1c as described above.

FIG. 2 shows the configuration of the band feeding device 2, the material edge control device 3, and the auxiliary feeding device 4 mounted on the base 1c, and the positional relationship between these and the presser foot 11 on the sewing machine bed 1a. It is a perspective view. Material edge control device 3 and auxiliary feeding device 4
As shown by the chain double-dashed line in FIG. 1, the belt feeding device 2 located on the upper part of the sewing machine applies a feeding force to the belt (rubber band R) supplied from above the sewing machine arm 1b, so that As shown in FIGS. 1 and 2, a pair of front and rear feed rollers 21 and 22 are installed on a roller base 20 fixed to a base 1c, and a pair of front and rear guide rods are provided above them. 23,23 is built.

Of the feed rollers 21 and 22, one (rear side) feed roller 21 is connected to an output shaft of a feed motor 24 fixed to one side of the roller base 20 via a timing belt 25.
A drive roller that is driven to rotate about the axis by transmission from the feed motor 24. The other (front) feed roller 22
Is rotatably installed around the axis between linking members 26, 26 having their base ends pivotally supported on both sides of the roller base 20 and swinging coaxially. The rocking operation of 26, 26 is performed by an operation lever 27 arranged on the outer surface of the other side of the roller base 20. Thus, the feed roller
22 is a biasing spring 28 whose one end is locked to the operating lever 27.
Is pulled backward together with the link members 26, 26 and pressed against the feed roller 21, functions as a driven roller that rotates following the feed roller 21, and resists the spring force of the biasing spring 28. And the operating lever 27 is operated,
Due to the swinging of the link members 26, 26 accompanying this, the feed roller 21
To the front of.

A band cutter 5 is attached to the band feeding device 2 configured as described above. This band cutter 5
Includes a cutter unit 50 arranged below the feed rollers 21 and 22 in substantially parallel therewith, and a cutter driving cylinder 51 located on the rear side of the feed motor 24 and fixed to the base 1c. Be prepared. The output of the cutter driving cylinder 51 is transmitted to the cutter unit 50 via a transmission unit (not shown).
The 50 performs a predetermined cutting operation according to this transmission. In addition,
The band cutter 5 that operates as described above is a known device, and a detailed description of its configuration is omitted.

As described above, the rubber band R supplied from above the sewing machine arm 1b is the guide rod of the band feeder 2.
23, 23, and then the feed rollers 21, 22, and then the cutter portion 50 of the strip cutter 5 in that order, and as shown in the drawing, is guided to the presser foot 11 on the sewing machine bed 1a located below and behind them. . The insertion of the rubber band R between the feed rollers 21 and 22 is performed by operating the operation lever 27 to separate the feed roller 22, and the rubber band R after the insertion is released by the operation lever 27. It is crushed between 22. Thus, the rubber band R is given a continuous feed force toward the sewing machine bed 1a by the rotation of the feed roller 21 accompanying the drive of the feed motor 24, and further the cutter portion accompanying the drive of the cutter drive cylinder 51.
By the operation of 50, the feeding section from the band feeding device 2 is appropriately cut.

The presser foot 11 overlaps the rubber band R guided from the band feeding device 2 with a predetermined width on the tube mouth end edge K'of the cloth K supplied along the upper surface of the sewing machine bed 1a as described later, Both of them are held under pressure. FIG. 3 is a side view showing the vicinity of the presser foot 11 in an enlarged manner. As shown,
A needle plate 12 is installed on the sewing machine bed 1a below the presser foot 11, and the needle plate 12 has a vertical plane below the needle plate 12 according to the operation of a known drive mechanism formed inside the sewing machine bed 1a. There are a front feed dog 13 and a rear feed dog 13 'for performing an elliptical movement in the inside.
Further, a plurality of needles 10 which are hung and supported on the upper end of the presser foot 11 at the tip of the sewing machine arm 1b and which perform a vertical stroke of a predetermined stroke in response to the operation of a known drive mechanism configured inside the sewing machine arm 1b. , 10 ... (only one is shown in Fig. 3)
And a pair of upper and lower auxiliary rollers 14 and 15 are arranged at the rear edge of the sewing machine bed 1a.

One of the auxiliary rollers 14 and 15 (upper side)
The auxiliary roller 14 is synchronized with the operation of the front and rear feed teeth 13 and 13 'by a transmission from a drive source (not shown) and is rotationally driven at a speed corresponding to these. As shown in the drawing, the cloth K is set in such a manner that the rear side of the sandwiching portion between the presser foot 11 and the needle plate 12 is sandwiched between the auxiliary rollers 14 and 15 and goes around the sewing machine bed 1a. The rubber band R set in the band feeding device 2 as described above is guided obliquely downward from above the sewing machine bed 1a to the front part of the presser foot 11,
Immediately before the descending position (needle dropping position) of the needles 10, 10, ..., It is superposed on the cloth K and is clamped between the presser foot 11 and the needle plate 12.

The cloth K set in this way is given a feed force by the operation of the front feed dog 13 and the rear feed dog 13 'and the rotation of the auxiliary roller 14, and falls downward from the rear edge side of the sewing machine bed 1a, A path is returned along the lower side of the sewing machine bed 1a to the front edge side, and returns to the needle drop position along the upper surface of the sewing machine bed 1a. In the meantime, the rubber band R fed from the band feeding device 2 is superposed on the cloth K at the lower part of the presser 11 and sewn by the vertical movement of the needles 10, 10 ... Return to the needle drop position.

The feed roller 21 of the band feeding device 2 is driven by the feed motor 24 to move forward feed teeth 13 and rear feed teeth 13.
It is driven to rotate in synchronism with the operation of 13 ', but this rotational speed is set to be slightly lower than the operating speed of both feed teeth 13, 13', and the rubber between presser foot 11 and needle plate 12 is The feeding of the band R is performed in a state where a constant tension is applied between the band R and the feed rollers 21 and 22 of the band feeding device 2. The operation of the feed roller 21 as described above can be realized by using, as the feed motor 24, which is a driving motor for the feed roller 21, a step motor capable of highly accurate rotation control.
The rubber band R and the cloth K are sewn together at the sewing start end A of both.
(See Fig. 4) Before the band returns to the needle drop position, the band cutter 5
Is operated to cut the rubber band R on the exit side of the band feeding device 2, and the cut portion is sewn to the sewing start end A for an appropriate length to complete.

The sewing machine for sewing the band shown in this embodiment is
In the sewing of the rubber band R performed as described above, each operation except the setting of the rubber band R and the cloth K prior to the start of the sewing and the removal of the cloth K and the rubber band R after the completion of the sewing are substantially completed. The material end sensor 6 detects the positional deviation of the tube mouth edge K'of the material K fed to the needle drop position, and the return of the sewing start end A to the needle drop position is detected. Which is provided with the sewing start end sensor 7, and further operates based on the detection results, the material edge control device 3, the auxiliary feeding device 4 and the band cutter 5, the material feeding amount correcting device 8 and the presser lifting device 9. Is equipped with.

As shown in FIG. 2, the material edge sensor 6 has a presser foot 11
Is provided on the sewing machine bed 1a in front of, and is provided with a pair of light emitting portions 60 and 61 that emit light in an upward direction, and a pair of light receiving portions 62 and 63 that are opposed to each other with a proper distance above them. The sewing start end sensor 7, which is a sensor, is disposed on the sewing machine bed 1a in front of the material end sensor 6, and similarly emits one light emitting portion 70 which emits light in an upward direction. And a light receiving section 71 facing each other.

FIG. 4 shows the light emitting portions 60 and 61 of the material edge sensor 6.
(Or light receiving parts 62, 63) and a light emitting part 70 (or light receiving part 71) of the sewing start end sensor 7 are plan views showing the arrangement positions.
As shown in this figure and FIG. 2, the sewing machine bed immediately before the presser foot 11
A movable knife 16 having a blade surface is arranged on the la 1 at a predetermined position in the width direction of the presser 11. This movable knife 16 is a forward feed tooth.
By a transmission from a known transmission mechanism branched from the drive mechanism of 13 and the rear feed dog 13 ', a vertical stroke is performed at a predetermined stroke, and the upper surface of the sewing machine bed 1a is slidably contacted with a fixed knife 17 having its blade surface along the upper surface. Thus, the tube mouth end edge K'of the cloth K fed into the presser foot 11 as described above is cut and aligned.

As shown in FIGS. 2 and 4, the sewing machine bed 1a
A reference feed line C along which the tube mouth edge K'of the cloth K should be routed is fed to the extension line B along the feed direction of the sliding contact portion between the movable knife 16 and the fixed knife 17 with the feeding of the rubber band R. Feeding side (inside)
The light emitting portions 60 and 61 of the material end sensor 6 are arranged close to each other across the reference feed line C. The light receiving portions 62 and 63 of the material edge sensor 6 capture the light emitted from the corresponding light emitting portions 60 and 61, and perform an operation of outputting an output according to each different light receiving amount, and the respective arrangements based on the output levels of both. Based on the light / dark judgment at the position, the reference feed line C
The positional deviation of the tube mouth end edge K'with respect to is detected as follows.

FIG. 5 is an explanatory diagram of this detection principle. The amount of light received by the light receiving portions 62, 63 changes depending on whether or not the light emission of the respective light emitting portions 60, 61 arranged as described above is blocked by the cloth K. Therefore, as shown in FIG. 4, when the tube mouth end edge K'is correctly along the reference feed line C, only the outer light emitting portion 60 is covered with the cloth K, so that the output level of the light receiving portion 62 is low and it is determined that it is dark. Then, the output level of the light receiving unit 63 is high, and it is determined that it is bright. On the other hand, as shown in FIG. 5A, when the tube mouth end edge K ′ is displaced to the inside of the reference feed line C, both light emitting portions 60 and 61 are covered with the cloth K, while FIG. ), When the tube mouth end edge K ′ is displaced to the outside of the reference feed line C, the light emission of both light emitting portions 60 and 61 reaches the light receiving portions 62 and 63 without being blocked by the cloth K,
In the former case, the output levels of the light receiving units 62 and 63 are low and both are determined to be dark. In the latter case, the output levels of the light receiving units 62 and 63 are oppositely high, and both are determined to be bright.

As described above, when the output level of the light receiving portion 62 is low, it is determined to be dark, and the output level of the light receiving portion 63 is high, and it is determined to be bright, the normal feeding state, that is, the tube end edge K '.
Is correctly sent along the reference feed line C, and the output levels of both the light receiving units 62 and 63 are both low and it is determined to be dark (or both are high and it is determined to be bright). It can be seen that the tube mouth end edge K ′ is displaced inward (or outward) with respect to the reference feed line C. Since the reference feed line C is set as described above, when the regular feed state is maintained, the tube mouth end edge K ′ of the cloth K is
The rubber strip R from the strip feeding device 2 is cut into an appropriate amount by the 16 and the fixed knife 17 and fed into the presser foot 11.
With the proper width, the above-mentioned sewing is surely performed.

On the other hand, the light emitting portion 70 of the sewing start end sensor 7 is
As shown in FIG. 4, it is arranged in front of the light emitting portions 60 and 61 of the material edge sensor 6 and further inside the inner light emitting portion 61, that is, at a position offset to the sewing side of the rubber band R. is there. With the arrangement of the sewing start end sensor 7 as described above, the return of the sewing start end A that occurs as described above is performed by determining the lightness / darkness of the output level emitted by the light receiving unit 71 that captures the light emitted from the light emitting unit 70 according to the amount of received light. Therefore, it can be detected before the presser foot 11, that is, the needle drop position is reached.

The cloth K being sewn is given a moving force in the direction orthogonal to the feeding direction by the operation of the cloth end control device 3 which will be described later based on the detection result of the cloth end sensor 6, and the cylinder mouth The feed position is changed so that the edge K ′ is along the reference feed line C, and the light emitting portion 70 of the sewing start end sensor 7 located further inside the light emitting portion 61 is not covered by the cloth K. As shown in FIG. 4, when the sewing start end A is returned to the sewing machine bed 1a, it is covered with the rubber band R sewn to the sewing start end A. Therefore, the output level of the light receiving portion 71 decreases in accordance with the position where the light emitting portion 70 is disposed, that is, the return of the sewing start end A to the front of the presser foot 11 by a predetermined length, and is determined to be dark. That is, the return of the sewing start end A can be detected by inverting the result of the light / dark determination based on the output level of the light receiving portion 71 of the sewing start end sensor 7 from bright to dark.

Next, the configurations of the material edge control device 3 and the auxiliary feeding device 4 mounted on the base 1c together with the band feeding device 2 will be described. As shown in FIGS. 1 and 2, the material edge control device 3
Along the front side of the lower part of the belt feeding device 2 along the sewing machine arm 1b
The swing arm 30 extends toward the tip of the.
At the base end of the swing arm 30, an output shaft of a material end motor 31 fixed below the feed motor 24 of the band feeding device 2 is arranged along the feeding direction of the material K on the sewing machine bed 1a. Is fitted and inserted substantially horizontally, and the swing arm 30 is swingable about the output shaft. On the other hand, on the tip end side of the swing arm 30, a material end control roller 32 is pivotally supported so as to be rotatable about a substantially horizontal axis parallel to the output shaft of the material end motor 31.

Axis of material edge control roller 32 and material edge motor
The output shaft of 31 is connected by a timing belt 33 wound between both shafts inside the swing arm 30,
The material edge control roller 32 is rotationally driven in both forward and reverse directions according to the rotation of the material edge motor 31 transmitted through the timing belt 33. On the other hand, inside the sewing machine bed 1a corresponding to the mounting position of the material edge control roller 32, a driven roller 34 paired with the material edge control roller 32 is mounted. The driven roller 34 is rotatably supported about an axis parallel to the material end control roller 32, and its upper portion is slightly projected from the upper surface of the sewing machine bed 1a.

The swing arm 30 is urged by an urging spring (not shown) mounted in the vicinity of the pivotal portion so that the front end of the oscillating arm 30 faces downward.
Is pressed against the lower driven roller 34, and the rolling contact state between the two is maintained. As shown in FIG. 4, the planar arrangement positions of the material edge control roller 32 and the driven roller 34 are in front of the material edge sensor 6 and sufficiently outside of the reference feed line C. It is set. Therefore, the rolling contact between the material end control roller 32 and the driven roller 34 occurs when the material K is sandwiched between them, and when the material end motor 31 is driven in this state, the material K is not A moving force in a direction orthogonal to the feeding direction is applied, and the cloth K moves inward (sewn side with the rubber band R) or outward.

At the base end of the swing arm 30, the sewing machine main body 1
A push-up plate 35 is projected toward the side, and a lift cylinder 36, which is a box-type air cylinder, is fixed to the upper part of the push-up plate 35. The elevating cylinder 36 has an output rod that moves forward and backward in the vertical direction. The output rod performs an advancing operation by air supply from an air source (not shown) and a retreat operation by shutting off the air supply.

When the elevating cylinder 36 is in the retracted state, the swing arm 30 swings by the bias of the bias spring, and the material end control roller 32 at the tip of the swing arm 30 descends to move the material K.
As described above, when the lifting cylinder 36 moves forward while rolling, the output rod of the lifting cylinder 36 causes the pushing plate to move.
35, that is, the base end of the swing arm 30 is pressed downward, the material end control roller 32 rises, and the rolling contact with the material K is released. It should be noted that the retracting operation of the lifting cylinder 36 and the accompanying rolling contact of the material end control roller 32 to the material K occur when an operation command is given from the control unit 100 described later.

On the other hand, the auxiliary feeding device 4 is arranged on the rear side of the material edge control device 3, and only a part thereof is shown in FIGS. 1 and 2. FIG. 6 is a view taken along the line VI-VI in FIG. 1, and shows only the auxiliary feeding device 4 in an extracted manner. The following description will be given according to this figure, and in order to enable contrast with this figure, the numbers of the respective constituent elements appearing in each figure are marked in FIGS. 1 and 2.

The auxiliary feeding device 4 is provided with a swinging arm 40 extending along the upper surface of the sewing machine bed 1a in the front-back direction of the material K feeding direction. The swing arm 40 is pivotally supported by the base 1c via a support bracket 40a which is provided at a midway portion in the longitudinal direction, and is swingable about a substantially horizontal axis orthogonal to the feed direction. An auxiliary feed motor 41 is fixedly installed on the base 1c at the lower rear side of the cutter driving cylinder 51 of the band cutter 5, and the output shaft of the auxiliary feed motor 41 is the swing arm 40. It is fitted and inserted in the support bracket 40a of FIG.

At the front end of the swing arm 40, the swing arm 40
Of the auxiliary feed motor 41, that is, the auxiliary feed roller 42 is rotatably supported around the axis parallel to the output shaft of the auxiliary feed motor 41. The shaft is connected via a timing belt 43 wound around both shafts. As a result, the auxiliary feed roller 42
Auxiliary feed motor transmitted via timing belt 43
It is driven to rotate in one direction according to the rotation of 41.

On the other hand, the rear side of the swing arm 40 is biased upward by a spring force of a coil spring 45 stretched between a spring 1 and a spring hooking projection 44 projecting upward from the base 1c. At the rear edge of the base 1c, a lifting cylinder 46, which is a box-type air cylinder similar to that in the material edge control device 3, is provided.
Is fixed, and an output rod projecting downward of the elevating cylinder 46 is brought into contact with the upper surface of the rear end portion of the swing arm 40.

The elevating cylinder 46 is normally in the advanced state due to air supply from an air source (not shown), and the swing arm 40
The auxiliary feed roller 42 attached to the front end of the swing arm 40 is pushed down on the rear side, and is located at a position away from the upper surface of the sewing machine bed 1a.
When 46 is retracted, the rear side of the swing arm 40 is pulled up by the spring force of the coil spring 45, so that the auxiliary feed roller 42
Rolls on the upper surface of the sewing machine bed 1a as shown in the figure. The interruption of air supply to the lifting cylinder 46 and the accompanying rolling contact of the auxiliary feed roller 42 occur when an operation command is given from the control unit 100 described later.

The planar arrangement position of the auxiliary feed roller 42 is
As shown in FIG. 4, it is set so as to be on the rear side of the material edge control roller 32 and inside the reference feed line C. That is, the rolling contact of the auxiliary feed roller 42 onto the sewing machine bed 1a occurs in the feed path of the rubber band R that returns to the sewing machine bed 1a when the sewing start end A returns, and in this state, the auxiliary feed motor 41 is moved. When driven, the auxiliary feed roller 42 is rotated to apply a feed force to the rubber band R which is pressed against the sewing machine bed 1a.

In FIG. 2, for the convenience of illustration, the material end sensor 6 and the sewing start end sensor 7 are connected to the auxiliary feed roller 42.
Although it is located on the rear side of the
The material edge sensor 6 and the sewing start edge sensor 7 are arranged between the material edge control roller 32 and the auxiliary feed roller 42.
Such an arrangement can be realized by attaching the light receiving portions 62, 63 of the material end sensor 6 and the light receiving portion 71 of the sewing start end sensor 7 to, for example, the lower side of the roller base 20 of the band feeding device 2.

Next, the structures of the material feed amount correcting device 8 and the presser lifting device 9 will be described. These are arranged at positions different from those of the material edge control device 3 and the auxiliary feeding device 4. The material feed amount correction device 8 is used for the material K for the rubber band R.
As shown in FIG. 1, it is integrally formed with an adjusting device 80 provided below the tip of the sewing machine bed 1a to adjust the amount of shirring. The presser foot lifting device 9 is, as will be described later, a sewing machine. It is configured inside and on the back side of the main body 1 and the sewing machine arm 1b.

The configuration of the material feed amount correction device 8 is as shown in FIG.
It is shown in FIG. 7, which is a view taken along the line II-VII. First, the configuration of the adjusting device 80 will be described. This adjusting device
The reference numeral 80 indicates that the feed amount of the front feed dog 13 is adjusted to the increase amount with respect to the feed amount of the rear feed dog 13 ', and the difference (difference amount) between the two feed amounts is changed as appropriate to obtain the above-mentioned shirring amount. 13a in the drawing is associated with the drive mechanism of the forward feed dog 13 inside the sewing machine bed 1a, and the operation amount can be adjusted by a rotating operation around the axis. It is an axis. The adjusting device 80 comprises an adjusting lever 81 whose base end is fixed to the pivot 13a, and a scale plate 82 which covers the entire surface of the adjusting lever 81. The scale plate 82 is fixedly supported by a support plate 83 provided upright on the rear portion of the sewing machine bed 1a.

The scale plate 82 has a long hole 82a through which the middle part of the adjusting lever 81 can be seen and a long hole 82b through which the tip of the adjusting lever 81 can be seen. It is formed in an arc shape. As shown in the figure, one of the elongated holes 82a has a plurality of graduation lines on its inner edge at predetermined intervals, and these graduation lines are aligned with a reference line formed in the middle of the adjusting lever 81. Accordingly, the pivotal position of the pivot shaft 13a determined by the swing angle of the adjusting lever 81,
That is, it is a scale hole for confirming the feed amount of the front feed dog 13. The other long hole 82b has a pair of stopper screws 8
4 and 85 are mounted so that they can be moved along the longitudinal direction and fixed at appropriate positions, and the tip of the adjusting lever 81 is located between both stopper screws 84 and 85, and both of them are moved vertically. The swing range of each is regulated.

In the adjusting device 80 constructed as above, the differential amount can be appropriately changed by swinging the adjusting lever 81 in the vertical direction and rotating the pivot 13a. This change is made so as to enable sewn-in stitching, and the adjusting device 80 is widely installed in sewing machines that handle stretchable cloth such as knitted fabric. In this embodiment, the feed amount of the front feed dog 13 is increased in accordance with the downward swing of the adjusting lever 81, and the differential amount is increased.

The dough feed amount correcting device 8 integrally formed with the adjusting device 80 has a branch lever 81a branched downward from the middle of the adjusting lever 81 and a lower part of the side plate 83 supporting the scale plate 82. The adjusting cylinder 86 is fixed, and the tip of the output rod extending forward of the adjusting cylinder 86 is connected to the branch lever 81a via a link member 87. Note that the speed governor 86 is an air cylinder that moves in and out by supplying air from an air source (not shown).
The output rod is weakly biased in the advancing direction by the spring force of a built-in spring (not shown).

The initial setting of the adjusting device 80 is performed by changing the fixing position of the upper stopper screw 84. As mentioned above,
The output rod of the adjustment cylinder 86 is urged in the advancing direction, and the link member 87 and the branch lever 81a are attached to this output rod.
The adjustment lever 81 connected via
The feed dog 13 is constrained to the position shown by being pressed against 84, and at this time, the front feed dog 13 maintains the differential amount corresponding to the fixed position of the stopper screw 84. That is, depending on the type of material K, the front feed dog 13
Determine the differential amount of, loosen stopper screw 84, and adjust lever
While pushing 81 down, move it along slot 82b to
By confirming and fixing the graduations on the inner edge of, the desired differential amount, that is, an increase amount of the feed amount of the front feed dog 13 with respect to the feed amount of the rear feed tooth 13 'can be realized.

By supplying air to the adjusting cylinder 86 in this state, the material feed amount correcting device 8 increases the differential amount of the front feed dog 13, that is, the feed amount of the material K at the front side of the needle drop position. Make a correction to the side. Adjusting cylinder 86 as described above
Is retracted by the supply of operating air, the adjusting lever 81 is swung downward, that is, toward the increasing side in response to this operation, and the lower stopper is moved as indicated by the broken line in the figure. It is constrained in the position pressed against the screw 85,
The differential amount of 13 is corrected to the increase side. Adjusting lever 81
Since the downward swing range of is restricted by the stopper screw 85, the stopper screw 84 is fixed as described above, and then the stopper screw 85 is fixed at a position separated from this fixed position by a predetermined length, thereby The correction degree of the amount can be set appropriately.

FIG. 8 is a schematic diagram showing the structure of the presser foot lifting device 9. Note that this figure is on the side opposite to the side shown in FIG.
It is the figure seen from the back side of the sewing machine, and the illustration of the presser foot lifting device 9 and its related parts is omitted.

The presser foot lifting device 9 raises and lowers the presser foot 11 which acts as a pressing force for the cloth K and the rubber band R. As shown in the figure, the presser foot 11 is attached to the lower end of a presser bar 90 which is vertically movable on the tip side of the sewing machine arm 1b.
A presser foot lifting shaft 91 is pivotally supported inside the sewing machine arm 1b so as to be swingable about a substantially horizontal shaft center along the extending direction of the sewing machine arm 1b. A link mechanism 92 is connected to a middle portion of the rod 90.

A support shaft 93 is pivotally supported below the base end portion of the presser foot lifting shaft 91 reaching the sewing machine main body 1 so as to be rotatable about an axis substantially orthogonal thereto. The support shaft 93 protrudes to the outside of the back surface of the sewing machine body 1 by an appropriate length.
A presser foot lifting lever 94 that extends substantially horizontally in the opposite direction to the sewing machine arm 1b is fixed. The other end of the support shaft 93 inside the sewing machine main body 1 is connected to a base end of a presser foot lifting shaft 91 located above the support shaft 93 with a proper distance therebetween via a link mechanism 95.

FIG. 9 shows a link mechanism 95 along the line IX-IX in FIG.
FIG. As shown in FIGS. 8 and 9, the link mechanism 95
Is a connecting arm 95a fixed to the base end of the presser foot lifting shaft 91.
And a connecting arm 95b fixed to the inner end of the support shaft 93,
A connecting rod that connects the tips of both arms 95a and 95b to each other.
With 95c. Connecting arm 95a as shown in FIG.
Has a tip extending toward the back surface of the sewing machine main body 1, and as shown in FIG. 8, the connecting arm 95b extends in the direction opposite to the extending direction of the sewing machine arm 1b. When the tip end side of the presser foot lifting lever 94 is pressed downward, the rotation of the support shaft 93 causes the tip end of the connecting arm 95a to be pulled down via the connecting rod 95c, and the presser foot lifting shaft 91
Rotates clockwise as indicated by the arrow in FIG.

On the other hand, the link mechanism 92 on the side of the presser shaft 90 includes a connecting arm 92a whose base end is fixed to the presser bar lifting shaft 91, and a connecting rod which connects the tip of the connecting arm 92a to the middle of the presser bar 90. It is equipped with 92b. The tip of the connecting arm 92a extends in the direction opposite to the connecting arm 95a of the link mechanism 95, that is, toward the front side of the sewing machine main body 1. When the presser foot lifting shaft 91 is rotated (clockwise in FIG. 9), the presser shaft 90 and the presser foot 11 at the lower end of the presser shaft 90 are rotated.
Are pulled up via the connecting rod 92b.

As shown in FIG. 8, a return spring 91a is wound around the middle of the presser foot lifting shaft 91, and the return spring 91a is
The presser foot lifting shaft 91 is biased in the direction opposite to the direction of rotation. Thus, when the pressing of the presser foot lifting lever 94 is released, the presser foot lifting shaft 91 rotates in the opposite direction (counterclockwise in FIG. 9) by the spring force of the return spring 91a, and the presser foot 11 moves to the presser bar 90. At the same time, it descends onto the sewing machine bed 1a and reaches a position (lower position) where the entire lower surface thereof is elastically contacted with the needle plate 12 as shown in FIG. Hold the pressure. The clamping force at this time is the known adjustment screw 90a provided on the protruding end of the presser bar 90 to the upper part of the sewing machine arm 1b.
Can be appropriately set by the operation of.

A base 96 protruding from the rear side of the sewing machine body 1 is provided with first and second presser-lifting cylinders 97, 98 for applying a pressing force to the presser-lifting lever 94. Both of these are air cylinders provided with output rods that advance downward by air supply from an air source (not shown), and the tips of the output rods are in contact with the upper surface of the presser foot lifting lever 94.

Second position located on the tip side of the presser foot lifting lever 94
The presser foot lifting cylinder 98 has a movement stroke that is sufficiently smaller than that of the first presser foot lifting cylinder 97, and responds to this when the presser foot lifting lever 94 is pressed by the advance of the first presser foot lifting cylinder 97. By the above-described operation of the link mechanisms 95 and 92, the presser foot 11 is pulled up to a position (upper position) having a sufficient space between it and the needle plate 12 on the sewing machine bed 1a, while the second presser foot lifting cylinder is used. When the presser foot lifting lever 94 is pressed by advancing 98, the presser foot 11 is only pulled up to a position having a slight gap with the needle plate 12, and at this time, the presser foot 11 is attached to this. Due to the spring force of the spiral spring 11a (see FIG. 3), the fabric K is inclined with the receiving side upward, and is restrained at a position (intermediate position) where contact with the needle plate 12 is maintained on the trailing edge side as shown in FIG. It is designed to be done.

The lifting of the first lifting cylinder 97 to the upper position is carried out when the sewing start ends of the cloth K and the rubber band R are set as described above. That is, by positioning the material K and the rubber band R on the lower part of the presser foot 11 that has sufficiently risen and releasing the operation of the first presser foot lifting cylinder 97, as shown in FIG. In the meantime, the cloth K and the rubber band R are pressed together to complete the initial setting. On the other hand, the presser foot is lifted up to the intermediate position by the second presser foot cylinder 98 when the sewing start end A is returned, as described later.

FIG. 11 is a block diagram of a control system of the band sewing machine according to the present invention having the above-mentioned structure.
In the figure, 100 is a control unit using a microprocessor, and a foot-operated pedal switch 101 for driving operation is connected to the input side of the control unit 100, and the control unit 100
Can recognize whether or not the pedal switch 101 is operated.

The output of the material end sensor 6 and the output of the sewing start end sensor 7 are applied to the input side of the control section 100 via an input circuit 103, respectively. These are outputs from the light receiving units 62 and 63 and the light receiving unit 71, and the control unit
The 100 samples the respective waveform-converted outputs in the input circuit 103 at every predetermined time, and shifts the tube mouth end edge K'of the cloth K and restores the sewing start end A to the needle drop position as described above. I am aware of it.

On the input side of the control unit 100, the rubber band R is fed at a feed rate, the material edge control unit 3 and the auxiliary feed unit 4 are operated at various speeds, and various delay times, which will be described later, are used for automatic rubber attachment. A numerical value setting circuit 104 for setting various necessary numerical values is connected, and the control unit 100
Takes in the numerical value set in this numerical value setting circuit 104,
It is used for the operation described later. The set value for the numerical value setting circuit 104 differs depending on the sewing conditions such as the type of the cloth K, the elasticity of the rubber band R, and the feed rate. Therefore, trial sewing is performed in advance to find an appropriate value, and the appropriate value is set. Set.

Further, various operation switches such as a trial sewing switch and a thread trimming switch are connected to the input side of the control section 100, and the rubber band R is interrupted, the needle thread or the looper thread is broken, and the sewing machine main body 1 Although outputs of sensors for detecting various abnormalities such as internal abnormality are given, these switches and sensors are not related to the gist of the present invention, and therefore, illustration and description thereof are omitted.

On the other hand, the output of the control unit 100 is given to the sewing machine motor 102 (see FIG. 1), which is the main driving motor of the sewing machine, and also the band feeding device 2, the material edge control device 3, and the auxiliary feeding device. 4, the band cutter 5, the material feed amount correction device 8 and the presser lifting device 9.

Outputs from the control unit 100 to the band feeding device 2 and the band cutter 5 are given to the feed motor 24 and the cutter driving cylinder 51 via their respective drive circuits. The feed roller 24 is driven to rotate by the operation of the feed motor 24 according to the output, and the rubber band R is fed out at a predetermined speed set in the numerical setting circuit 104, and the band cutter 5 outputs the output of the control unit 100. The cutter portion 50 is operated by the operation of the cutter driving cylinder 51 according to
Disconnect.

The output to the material edge control device 3 is given to the material edge motor 31 via its drive circuit, and the material edge control roller 32 is rotated normally and reversely by the operation of the material edge motor 31 according to the output. The cloth K is driven, and a moving force in a direction orthogonal to the feeding direction is applied to the cloth K as described above. The output to the material edge control device 3 is also given to the solenoid valve arranged in the air supply circuit to the lifting cylinder 36, and the material edge control is performed by the withdrawal operation of the lifting cylinder 36 according to this output. The roller 32 descends and comes into rolling contact with the driven roller 34, so that the moving force can be applied.

The output to the auxiliary feeding device 4 is the same as that to the material edge control device 3, and the drive circuit of the auxiliary feeding motor 41,
It is provided to a solenoid valve arranged in the air supply circuit to the lifting cylinder 46, and the auxiliary feed roller 42 descends onto the sewing machine bed 1a by the retracting operation of the lifting cylinder 46 according to the output of the latter. The auxiliary feed roller 42 is rotated by contact with the rubber band R and the auxiliary feed motor 41 operates in accordance with the former output, and the feeding force is applied to the rubber band R. The rotation speed of the auxiliary feed roller 42 at this time is 1
It can be adjusted by setting a numerical value to 04. This adjustment is made by the amount of feed of the rubber band R given by the rotation of the auxiliary feed roller
It is adjusted to be equal to the feed amount of the fabric K after being corrected by the fabric feed amount correcting device 8.

The output to the dough feed amount correction device 8 is given to a solenoid valve arranged in the air supply circuit to the adjusting cylinder 86, and the adjusting cylinder 86 advances in response to this output,
As described above, the feed amount of the cloth K by the operation of the front feed dog 13 is increased by a predetermined amount from the original feed amount set by the adjusting device 80, and the front feed dog 13 'with respect to the rear feed dog 13' is increased.
The differential amount of is corrected to the increasing side.

Further, the output to the presser foot lifting device 9, which is a characteristic part of the present invention, is output to the first and second presser foot lifting cylinders 97, 98.
To the solenoid valve separately arranged in the air supply circuit to the presser foot 11, and the presser foot 11 is moved to the upper position and the second position by the advancing operation of the first presser foot lifting cylinder 97 according to these outputs.
By the advancing operation of the presser foot lifting cylinder 98, the cylinders are raised to the intermediate positions.

The operation of the control unit 100 configured as described above depends on the operation of the pedal switch 101 by the operator.
This is performed according to the time chart shown in FIG. The operation of the pedal switch 101 is performed once when the cloth K and the rubber band R are set as described above, and once when the subsequent sewing operation is started.

First, in response to the first operation of the pedal switch 101, the control unit 100 causes the band feeding device 2 to perform a predetermined time T ₁
Operation command of the first presser foot lifting device 9
Continues the operation command to the work clamp cylinder 97 of. As a result, the rubber band R is fed from the band feeding device 2 for a predetermined length, and the tip of the rubber band R reaches a position where the pressing force by the presser 11 is possible, while the presser 11 maintains the above-mentioned upper position. The K and the rubber band R can be easily set. During this time, the operation of the sewing machine motor 102 and the respective parts driven by the sewing machine motor 102 are stopped, and the material end control roller 32 of the material end control device 3 and the auxiliary feed roller 42 of the auxiliary feed device 4 are Since it is in the upper position, it does not interfere with the setting of the cloth K. Further, during this time, the movable knife 16 arranged on the front part of the presser foot 11 is moved by the operation of an elevating mechanism (not shown) to move the cloth K.
Has been lowered to a position where it does not interfere with the set.

The second operation of the pedal switch 101 is carried out after the completion of the above-described setting work. At this time, the rubber band R and the cloth K are held by the presser plate 11 which has returned to the lower position in a sandwiched state with the needle plate 12, and the operation of the band feeding device 2 is stopped together with the operation of other devices. In addition, the movable knife 16 ascends and projects to the upper part of the sewing machine bed 1a.

In response to the second operation, the control unit 100 issues a continuous operation command to the sewing machine motor 102 and the band feeding device 2. As a result, the rubber band R is fed from the band feeding device 2, is superimposed on the cloth K at the lower portion of the presser 11 as described above, and the feeding force is applied by the operation of the front feed dog 13 and the rear feed dog 13 '. At this time, the feeding speed of the rubber band R by the band feeding device 2 is set to the front and rear feed teeth 13, 1 as described above.
It is slightly smaller than the feeding amount of the fabric K by 3 ',
This is done by numerically setting the former in the numerical setting circuit 104 and then adjusting the latter by the above-described operation of the adjusting device 80.

Further, the control unit 100 issues a continuous operation command to the lifting cylinder 36 of the material edge control device 3. The material edge control roller is operated by the operation of the elevating cylinder 36 according to this operation command.
32 descends and holds the cloth K between the driven roller 34,
The cloth K is brought into a state in which the above-mentioned moving force can be applied, and thereafter, the control unit 100 detects the result of the cloth edge sensor 6 in order to eliminate the deviation of the tube mouth end edge K ′ from the reference feed line C. Based on the operation command issued to the material edge motor 31,
A material edge control operation for driving the material edge control roller 32 in the forward and reverse directions is performed.

FIG. 13 is a flowchart showing the operation contents of the material edge control. The control unit 100 takes in the output of the material edge sensor 6, that is, the output of the light receiving units 62 and 63 arranged as described above at a predetermined time interval (step 1), and first outputs the output X of the outer light receiving unit 62. ₁ is compared with a predetermined reference level X, that is, the light reception result of the light receiving unit 62 is judged (step 2), and then the output X ₂ of the inner light receiving unit 63 is compared with the reference level X. That is, the light / dark determination of the light reception result of the light receiving unit 63 is performed (steps 3 and 4).

As a result, X ₁ is smaller than X and X ₂ is X.
, I.e., the light receiver 62 is dark and the light receiver 62
If it is determined that 63 is clear, it means that normal feeding has been performed, so the state is kept as it is and the process proceeds to step 5. Further, when both X ₁ and X ₂ are smaller than X, that is, when it is determined that the light receiving portions 62 and 63 are both dark, the tube mouth end edge K ′ is located inside (rubber rubber) with respect to the reference feed line C. Since it is deviated to the sewn side with the belt R), a predetermined forward rotation command is issued to the material end motor 31 in order to apply an outward moving force to the material K (step 6), and then the process proceeds to step 5. On the contrary, when X ₁ and X ₂ are both larger than X, that is, when it is determined that the light receiving portions 62 and 63 are both bright, it is determined that the tube mouth end edge K ′ is displaced outward, Fabric K
A predetermined reverse rotation command is issued to the material end motor 31 in order to apply an inward moving force to the material (step 7), and then the process proceeds to step 5. The above-described principle of determining the deviation is as described in FIG. The material edge motor in steps 6 and 7
The amount of forward / reverse rotation of 31 is determined based on the result of trial sewing,
Set a numerical value in the numerical setting circuit 104 beforehand.

In step 5, it is checked whether or not the sewing start end A is detected by the sewing start end sensor 7. If this detection is not made, the process returns to step 1 and the above-mentioned operation is repeated, and if this detection is made. , A series of material edge control operation is completed. Furthermore, as a result of the determinations in steps 2, 3 and 4, when it is determined that the light receiving unit 62 is bright and the light receiving unit 63 is dark, such a state cannot occur under normal conditions. It is determined that there is an abnormality in the material edge sensor 6, and this is notified to the operator by an appropriate alarm means such as lighting of an alarm lamp and generation of an alarm sound (step 8), and the subsequent operation is not performed. Finish the material edge control operation.

By the above operation, the tube mouth end edge K'of the cloth K follows the reference feed line C from the start of sewing the cloth K and the rubber band R to the return of the sewing start end A on the sewing machine bed 1a. The sheet is fed to the needle drop position while keeping the regular feeding path, and is overlapped with the rubber band R from the band feeding device 2 by an appropriate width to perform reliable sewing.

After the material end control operation is completed in response to the detection of the sewing start end A by the sewing start end sensor 7, the controller 100
First, after a lapse of a predetermined time T ₂ from the time when the sewing start end A is detected, an operation command to continue for a predetermined time T ₃ is given to the auxiliary feed motor 41 and the elevating cylinder 46 of the auxiliary feed device 4, and at the same time the presser foot is lifted. Second presser foot lifting cylinder 98 of device 9
Is given an operation command to continue for a predetermined time T ₄ . Further, the operation command from the control section 100 to the material edge control device 3 is continued for a predetermined time T ₅ from the time when the sewing start edge A is detected,
After that, a stop command is given. The operation command is for continuously rotating the material edge control motor 31 in reverse.
Due to the reverse rotation of the cloth edge control roller 32, the cloth K is
The rubber band R that is moved to the inside (the side on which the rubber band R is sewn) and returns together with the sewing start end A is parallel to the feed path of the material K, and the ruler G (FIG. 4) arranged on the sewing machine bed 1a. (See), the state where the edge is abutted against. Further, the control unit 100 waits for a predetermined time T ₆ from the time when the sewing start end A is detected, gives an operation command to the material feed amount correcting device 8 to continue for a predetermined time T ₇ , and also the predetermined time T 6. _After a lapse of _8, a stop command is given to the band feeding device 2, and at the same time, a short-time operation command is given to the band cutter 5.

Finally, the control section 100 gives a stop command to the sewing machine motor 102 almost at the same time when the operation command to the auxiliary feeding device 4 is completed, and the operation of the presser lifting device 9 to the second presser lifting cylinder 98 is performed. Upon completion of the command, an operation command is given to the first presser lifting cylinder 97, and at the same time as this, a short-time operation command is given to the band feeding device 2 to end a series of operations. The magnitude relation between the standby times T ₂ , T ₆ and T ₈ and the durations T ₃ , T ₄ , T ₅ and T _{7 in} the above operation is as shown in FIG. 12, for example, and these are set in the numerical setting circuit 104. The number of hands is set as a medium.

The following effects can be obtained by the above-mentioned operation starting from the detection of the sewing start end A by the sewing start end sensor 7. First, after the lapse of the waiting time T ₂ , the auxiliary feed roller 42 descends onto the sewing machine bed 1a and is rotationally driven by the auxiliary feed motor 41 as described above. Therefore, as shown in FIG. A feeding force is applied to R at a speed substantially equal to the feeding of the material K by the feed teeth 13 and 13, and there is no fear that the feeding of the rubber band R into the needle plate 11 will be relatively delayed. It becomes unnecessary to assist the feeding to the rubber band R side by the work.

The waiting time T ₂ before the operation of the auxiliary feed device 4 is based on the time required for the sewing start end A detected by the sewing start end sensor 7 to reach the rolling contact position of the auxiliary feed roller 42. , The duration of this operation T
₃ is the forward feed tooth based on the time taken for the sewing start end A to reach the needle drop position from the rolling contact position of the auxiliary feed roller 42.
13 and the feed amount of the cloth K by the rear feed dog 13 'are taken into consideration.

On the other hand, due to the advancing operation of the second presser lifting cylinder 98 which occurs after the waiting time T ₂ has elapsed, the presser foot 11
Is constrained to the intermediate position and inclines with the front edge upward,
As shown in FIG. 10, the rubber band R fed together with the sewing start end A and the rubber band R cut by the operation of the band cutter 5
You can accept the overlapping part with
There is no risk of clogging of the front edge of the presser foot 11. Therefore, the process of sewing the rubber band R cut by the band cutter 5 to the sewing start end A for an appropriate length can be automatically performed without stopping the sewing machine body 1 and reducing the operating speed.

Further, substantially at the same time as the operation of the auxiliary feeding device 4 is started, the material edge control device 3 imparts an inward moving force to the material K by the reverse rotation of the material edge control roller 32 at the time T _{5 so} that the material K is moved. The operation of bringing the end edge of the rubber band R sewn on into contact with the ruler G is performed, and the operation is stopped according to a stop command given thereafter. This allows the material edge control roller 32
Moves away from the driven roller 34 by advancing the elevating cylinder 36, stops rotation by stopping the material end motor 31, and waits until the next operation command is given. At the same time, the movable knife 16 is lowered by the operation of an elevating mechanism (not shown) so as not to hinder the movement of the rubber band R that returns together with the sewing start end A, and the stroke in the vertical direction is further reduced to operate. To do.

Further, after the waiting time T ₈ has passed, the strip cutter 5 is operated, and the rubber strip R kept in the stretched state between the strip feeding device 2 and the presser foot 11 is cut, but immediately before this. That is, after the waiting time T ₆ has elapsed from the detection of the sewing start end A,
By the operation of the fabric feed amount correction device 8, the feed amount on the fabric K side is increased, and the shirring amount of the fabric K is increased corresponding to the shortening of the rubber band R due to the cutting. A difference in the sewing state does not occur before and after the cutting, and a good finished state can be obtained.

The above-mentioned auxiliary feeding operation by the auxiliary feeding device 4 is completed in accordance with a stop command from the control unit 100 issued at substantially the same time as the operation of the sewing machine main body 1 is stopped after the operation of the material feed amount correcting device 8 is stopped. The roller 42 moves upward by advancing the elevating cylinder 46, stops rotation by stopping the auxiliary feed motor 41, and waits until the next operation command is given. Further, after that, in the presser foot lifting device 9, the first presser foot lifting cylinder 97 advances simultaneously with the retreat of the second presser foot lifting cylinder 98 in accordance with the above-mentioned command from the control unit 100, and the presser foot 11 moves to the upper position. Climb up to and keep this position.

That is, after the operation of the sewing machine main body 1 is stopped, the presser foot 11 is maintained in the upper position by the advancement of the first presser foot lifting cylinder 97, and further, the material end control rollers of the material end control device 3 are
32 and the auxiliary feed roller 42 of the auxiliary feed device 4 are raised by the advancement of the respective lifting cylinders 36 and 46, and the sewing machine bed
Since the cloth K is sufficiently separated from the cloth K on 1a, it does not hinder the subsequent removal of the cloth K and the rubber band R that have been sewn.

Finally, the short-time operation command given to the band feeding device 2 is the feed rollers 21 and 22 of the band feeding device 2 and the band cutter 5 as the rubber band R is cut by the band cutter 5.
This is because in consideration of the fact that the rubber band R between the cutter unit 50 and the cutter unit 50 is also shortened, a small amount of the tip of the rubber band R is sent to a predetermined position (position reaching the cutter unit 50) before the next operation starts. As a result, by the feeding operation for T ₁ time in response to the _first operation of the pedal switch 101, the tip of the rubber band R surely reaches the front edge position of the presser 11 and the setting work of the rubber band R and the cloth K is performed. Can be done without difficulty.

In this embodiment, the application example to the rubber sewing machine for sewing the rubber band R to the cloth K has been described, but the application of the present invention is not limited to this, and the elasticity is not limited. It goes without saying that the present invention can also be applied to a sewing machine used to sew a band which does not have it to the mouth end edge of a cloth.

[0088]

As described above in detail, in the sewing machine for sewing the band according to the present invention, the sewing start end sensor detects the return of the sewing start end to the needle drop position, and a small amount of the presser foot is detected according to the detection. Since it is raised and restrained at a position slightly moved up from the confining position during normal operation, the overlapping portion of the sewn belt and the belt before sewing returns together with the sewing start end It can be easily received in the lower part of the presser without causing any clogging in the sewing machine, and the entire process up to the sewing of the overlapped portion is automatically performed without stopping the sewing machine and forcing low-speed operation, and without manual work. The present invention has excellent effects such that it can be performed and can contribute to the efficiency of the sewing work of the band.

[Brief description of drawings]

FIG. 1 is a front view of a sewing machine for sewing a band according to the present invention.

FIG. 2 is a perspective view showing configurations of a band feeding device, a material edge control device, and an auxiliary feeding device, and a positional relationship between these and a presser foot on a sewing machine bed.

FIG. 3 is an enlarged side view showing the vicinity of a presser foot.

FIG. 4 is a plan view showing an arrangement mode of a material edge sensor and a sewing start edge sensor.

FIG. 5 is an explanatory diagram of a principle of detecting a positional deviation by a material edge sensor.

FIG. 6 is a side view showing a configuration of an auxiliary feeding device.

FIG. 7 is a side view showing a configuration of a fabric feed amount correction device.

FIG. 8 is a schematic diagram showing a configuration of a presser foot lifting device.

9 is a side view taken along the line IX-IX in FIG.

FIG. 10 is an explanatory diagram of an intermediate position of the presser foot caused by the operation of the presser foot lifting device.

FIG. 11 is a block diagram of a control system of the sewing machine for sewing a band according to the present invention.

FIG. 12 is a time chart showing the operation contents of the band sewing machine according to the present invention.

FIG. 13 is a flowchart showing an operation content of material edge control in the sewing machine for sewing a band according to the present invention.

[Explanation of symbols]

 1 Sewing machine main body 1a Sewing machine bed 2 Band feeding device 3 Material edge control device 4 Auxiliary feeding device 5 Band material cutter 6 Material edge sensor 7 Sewing start edge sensor 8 Material feed amount correcting device 9 Presser foot lifting device 10 Needle 11 Presser foot 13 Tooth 13 ′ Rear feed tooth 21 Feed roller 22 Feed roller 24 Feed motor 90 Presser bar 91 Presser foot lifting shaft 94 Presser foot lifting lever 97 First presser lifting cylinder 98 Second presser lifting cylinder 100 Controller 101 Pedal switch 102 Sewing machine motor 104 Numerical value setting circuit A Sewing start point C Reference feed line G Ruler K Fabric R Rubber band

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[Procedure amendment]

[Submission date] December 8, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

Claims (1)

[Claims] 1. A cloth having a tubular mouth is fed along a sewing machine bed to a needle drop position, and a band having an appropriate width is fed to the needle drop position from above the sewing machine bed by the operation of a dedicated feeding device. An operation of stacking the band body on the edge of the tube mouth, holding the sandwich with a presser foot, and sewing.
Before the sewing start ends of both of them return to the needle entry position, cut the band, and sew an appropriate length to the restored sewing start end to complete the sewing operation. Means for detecting the return of the sewing machine through the existence of the band body sewn at the sewing start end, and the sewn belt body which operates in response to the detection and returns together with the sewing start end by the feeding device. A sewing machine for sewing a belt body, which is provided with a presser foot lifting means for raising the presser foot by a predetermined amount so as to be received together with the belt body.