JP2739448B2 - Sewing machine for both edges of long objects - 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 for folding and sewing both side edges (ears) of a long object such as a raw towel web.

[0002]

2. Description of the Related Art Conventionally, a double-head sewing machine provided with a pair of right and left sewing machines for sewing the two towels of a raw towel by folding the both ears into three has been widely used by towel manufacturers. This sewing device is used for thin towels that mainly use bath towels.
There is an advantage that the both ears can be sewn efficiently with the meandering follow-up means.

[0003] However, with the recent improvement in living standards,
Many luxury towels have a thick part (usually a border weave) incorporating a pattern on the towel, and fold and sew the two ears of the original cloth of the towel connected by castor (joining part only with warp). As you go, the toweling becomes thinner and thicker on the way, making it difficult to clean and fold and sew.

As shown in FIG. 5, a thick portion a1 incorporating such a pattern (a densely woven ground-filled portion, which is the hardest portion with a towel, but not necessarily the thickest portion) , The pile woven portion may be thicker), and when the two ears a of the raw towel web A having a thick portion a1 are folded and sewn by a conventional sewing device, the trifold b1 is broken. As a result, if the fold is made into two pieces, the bristle of the edge (end thread c) comes out, or the ear a protrudes from the spiral guide, making it impossible to continue the three folds, thereby deteriorating the finish of the towel. Further, it is desired to efficiently sew the ear a for various towels.

[0005]

The object to be solved is to solve a long and meandering moving object such as a raw towel having a thick portion over the entire width in the longitudinal direction.
It is a point that both side edges are neatly folded and not sewn.

[0006] The present invention has been made in view of the above points,
For a long, meandering moving object such as a raw towel that has thick parts in the longitudinal direction, it can be cut and trimmed to remove both side edges of the thick part, and both sides can be folded and trimmed in three forms. An object of the present invention is to provide a sewing machine for both side edges of a shaku.

Further, by using a lower fixed blade such as a scalpel of a chain stitch machine and a movable blade which meshes with the movable blade to move up and down, the both sides of the thick part are cut off. The cutting means can be neatly cut without being distorted, and the cutting means is mounted on the moving means via a cylinder and a slider for moving the cutting means inward by a cutting operation signal, thereby stopping in an engaged state. It is possible to apply a fixed blade and a movable blade that moves up and down.

Further, the moving means is constituted by a screw rod rotated by a reversible motor, a nut screwed to the screw rod, and a cutting means mounting base attached to the nut to improve the response to meandering. Alternatively, a rotary encoder may be used as the distance measuring means to improve the cutting accuracy of the side edge of the thick portion, or a timer may be used for simplification.

[0009]

In order to achieve the above-mentioned object, the present invention provides a sewing machine at both side edges of a long object, comprising: a) a thin portion such as a raw towel roll driven by feed means and a thick portion; A sewing machine installed on both sides of the machine base orthogonal to the longitudinal traveling direction of the long object having a portion so as to approach and move away from the long object; b) both sides of the long object installed in front of the sewing machine An edge tri-fold means; and c) a moving means provided in front of the tri-fold means so as to be reciprocally movable in the orthogonal direction;
d) on the moving means, both side edge cutting means installed so as to be able to cut at each side edge of the running long object, and e) directly or indirectly on the thick part, installed before the cutting means. And f) a thick portion detecting means for transmitting a thick portion detection signal during the detection, and f) driven by the traveling long object,
Measure the travel distance of the long object at least between the detecting means and the cutting means by the thick part detection signal, and send a thick part reaching signal at the position where the thick part reaches the cutting means. A distance measuring means for causing the cutting means to perform a cutting operation; and g) a meandering means provided on the moving means adjacent to the cutting means for detecting the meandering of a running long object. And a means for detecting the side edge of a long object to be moved.

[0010] According to a second aspect of the present invention, h) a plain stitch sewing machine is used as the sewing machine, and a lower fixed blade is engaged with the lower fixed blade like a knife of a chain stitch sewing machine as the means for cutting off the both side edges of the long thick part, so as to move up and down. And movable blades that can be used. As described in claim 3, i) the cutting means can be mounted on the moving means via a cylinder and a slider for moving the cutting means inward by the cutting operation signal.

According to a fourth aspect of the present invention, j) the moving means includes a screw rod rotated by a reversible motor, a nut screwed to the screw rod, and a cutting means mounting table attached to the nut. Can be configured. As described in claim 5,
k) The distance measuring means can be constituted by a rotary encoder. As described in claim 6, l) the distance measuring means can be constituted by a timer.

[0012]

In the sewing machine according to the first aspect of the present invention, a long material having a thin portion and a thick portion, such as a raw towel, travels in the longitudinal direction by feed means. When the thick portion arrives at the long material thick portion detecting means while being driven, the thick portion is directly detected, or indirectly at a step portion of a pile weave and a plain weave separated from the thick portion by a predetermined distance. The thick portion is detected, and the detecting means transmits the thick portion detection signal while detecting the thick portion, and stops transmitting the thick portion detection signal when the thin portion arrives. When it is calculated and confirmed by the distance measuring means that the thick part has reached the thick part both-side cutting means, a thick part reaching signal is transmitted to cause the both side cutting means to perform the cutting operation, and the thick part passes. Then, when the thin part comes, the cutting to both side edges of the thin part is stopped. The slightly cut off side edges of the thick portion have a smaller volume to be tri-folded, and are securely tri-folded by the tri-fold means similarly to the side edges of the thin portion, and are sewn with a sewing machine to obtain a good finish.

The cutting means is reciprocally movable by a moving means in a direction perpendicular to the longitudinal running direction of the long object, and a meandering detecting means provided on the moving means adjacent to the cutting means. Thus, the meandering of a long object running is detected, and the moving means is constantly moved to follow the meandering. Therefore, it is possible to prevent the resection due to meandering from occurring, and to enhance the resection response. The sewing machine is installed so as to approach and move away from the long object in a direction orthogonal to the longitudinal running direction of the long object. When the sewing machine is moved closer, and the sewing speed of the sewing machine is reduced, the finishing of a thick portion, which is difficult to sew, is improved.

In the sewing machine according to the present invention, a plain stitch sewing machine is used as the sewing machine, and a lower fixed blade is engaged with the lower fixed blade like a knife of a chain stitch sewing machine as the means for cutting off the both side edges of the long thick part, and moves up and down. When using the movable blade and each,
Speedy and clean resection can be performed without distorting the side edges of the thick part. In the sewing machine according to the third aspect, the cutting means is mounted on the moving means via a cylinder and a slider for mounting the cutting means, which slightly shifts the cutting means inward by the thick portion reaching signal. At the outside of the both sides, and the thick part is cut into the both sides (ears) by the thick part reaching signal. Therefore, a cutting means comprising a lower fixed blade and a vertically movable blade which may stop in an engaged state can also be used.

According to a fourth aspect of the present invention, the moving means includes a screw rod rotatably driven by a reversible motor, a nut screwed to the screw rod, and a cutting means mounting table attached to the nut. The responsiveness to the meandering of a long object can be improved with a simple configuration. In the sewing machine according to the fifth aspect, a rotary encoder is used as the distance measuring means to enhance the cutting accuracy of the side edge of the thick portion.
The use of a timer as the distance measuring means makes it possible to simplify confirmation of arrival at the long thick part.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sewing machine according to the present invention. FIG. 1 is a plan view showing a main part of a sewing machine according to a representative embodiment, and FIG.
Is a right side view of the same, FIG. 3 is a perspective view showing a main part of only the left side,
FIG. 4 is an elevational view of the left-side moving means.

As shown in these figures, the sewing machine 1 is used to sew both side edges (ears) a of a raw towel web A as a long object. This sewing machine 1 has a thick portion a1 having a large thickness over its entire width.
Further, the towel material A having a thick and clean three-fold is hard to fly in the longitudinal direction, and the meandering is reduced by the pair of left and right cross guiders 3L and 3R while the feed means 10 of the front and rear feed rollers 11 and 12 are used as arrows. Feed in the direction of X, and ears a, a on both side edges of the raw towel fabric A.
, The spiral guide 25L of the left and right tri-fold means,
After being tri-folded by 25R, the left and right plain stitch machines 26L and 26R are used for sewing.

First, immediately after the front feed roller 11, the thick part a1 is separately detected on the left and right by the thick part detectors 31L and 31R (the textile product such as the raw towel web A travels in a slightly distorted state). In many cases, the thick part a1 is detected by the thick part detection signal in each thick part detection signal.
L, a rotary encoder 2 as a distance measuring means driven by the towel web A to reach a distance L1 reaching the 22R.
Measurement starts at 0L and 20R. Then, at the time when their arrival is calculated, a thick part reaching signal is transmitted, and a cutting operation is performed so as to cut both side edges in the thick part a1.

The cutting operation is performed via meandering correction moving means 15L and 15R equipped with cutting means 22L and 22R. The moving means 15L and 15R are connected to the cutting means 22.
L, 22R, a reversible motor 17 whose rotation direction is controlled by meandering detecting means 16L, 16R for detecting meandering of the towel side edge, a screw rod 18A rotated by the motor 17, and a screw Nut 18 combined
B and a cutting means mounting table 19 attached to the nut 18B.
It is composed of The cutting means mounting table 19 mounts the meandering detecting means 16L and 16R so as to be position-adjustable according to the width A of the raw towel, and further cuts slightly inward by the air cylinders 4 when reaching the thick part a1. The slider 19A is mounted so as to be reciprocally movable, and the side edges (ears) a of the thick portion a1 are lightly scraped off by the cutting means 22L and 22R when shifting inward.
After the scraping, it is returned to the original standby position outside the both side edges a.

The meandering of the raw towel web A is reduced by the pair of left and right cross guiders 3L and 3R, but it is necessary to eliminate the meandering just before the cutting means 22L and 22R in order to cut both side edges evenly. There is. However, in the present invention, the cutting means 22L and 22R are changed to the moving means 15L and
5R eliminates the relative displacement between the side edges of the raw towel web A and the cutting means 22L and 22R along the meandering.

The detecting means 16L and 16R on the side edge of the towel are:
Outer detectors 16LO and 16RO at positions 1 to 1.5 mm outside each side edge of raw towel A and 1 to 1.5 m inside the side edge
The inner detectors 16LI and 16RI at the m position are arranged. For example, during operation, the ears a, a of the towel
When the 6LO and 16RO are closed, the motor 17 is rotated forward (the right and left sides are reversed) and the cutting means 22 is cut through the cutting means mounting base 19.
L, 22R and the detection means 16L, 16R move outward until the blockage is released, and the ears a, a
When I and 16RI are closed, the motor 17 is rotated in the reverse direction and moves inward until the blocking is released.
22R is intended to be along both side edges. When the distance between the outer and inner detectors is 2 to 3 mm, the detector does not operate in the dead zone.

The cutting means 22L and 22R are composed of a lower fixed blade, such as a scalpel of a chain stitch sewing machine, and a movable blade that meshes with the lower fixed blade and moves up and down at a high speed. Can be. Of course, the cutting means 22
As the L and 22R, a sharp blade such as a round blade type or a guillotine type other than a female type is used.

Further, the thick portion a1 is formed by the spiral guide 25.
L, 25R are reached by the rotary encoder 20
L, 20R, and immediately before reaching the spiral guides 25L, 22R, the feed speed of the feed means 10 and the sewing speed of the plain sewing machines 26L, 26R are reduced, and the left and right spiral guides 25L, 25R and the sewing machines 26L, 26R Are slightly shifted inward by the air cylinders 5 and 5, and the tri-folded portions b1 and b1,
b1 are reliably formed, and their tri-fold portions b1, b1
Is smoothly sewn with the flat stitch sewing machines 26L and 26R. After the sewing, the feed speed of the feed means 10 and the sewing speed of the sewing machine are returned to the original values, and the spiral guides 25L and 25R and the plain sewing machines 26L and 26R are returned to the original positions.

Feed roller 11 in front of feed means 10
In this example, a rubber roller is used, and the sewing machines 21 and 2
6 is synchronized with the feed speed of the feed dog 6 (only 26a is shown).
2 is driven by the variable speed motors M1 and M2 of each inverter so as to be extremely slightly faster than the feed speed of the feed dog (26a), thereby preventing the sewn raw material A from loosening.

As the thick section detectors 31L and 31R, electric field proximity switches are used and fixed on the horizontal frame 6 of the machine base F at a height slightly higher than the thickness of the thick section a1 of the towel (the height is adjusted). Possible). These detectors 31L,
From 31R to the cutting means 22L, 22R and the spiral guide 2
The distances to the front ends of 5L and 25R are set to be constant, and the number of pulses corresponding to each distance is input to rotary encoders 20L and 20R of the controller. It is input to cancel the thickness change for the caster (joining part of only the warp) connecting the towels one by one on the way.

The fabric presser 40 is provided on the mounting table 2 of the plain sewing machine.
9, an L-shaped leg 41 which is fixed so as to be transferable to a support arm 24a extending from above, and presses each corner between the ear a and the present fabric (pile weave, etc.) to raise the ear a; 4 extending downward and fixed to the support arm 24a
2 and an arm 42 extending behind the block 42
and a holding plate 43 which stably holds the raised ear part a so as to be relocated to a and stabilizes the movement of the raw material A, and assists the three-folding operation of the spiral guides 25L and 25R.

On the front side of the horizontal sewing stitches 26b, 26b provided inside the front of the left and right plain stitch sewing machines 26L, 26R, spiral guides (also called wrappers) 25L, 2L,
5R is fixed, and the ear a, which is raised and easily inserted, is folded in three, and the feed dogs 26a, 26a immediately behind the ear a are folded.
Is sent as a three-fold part b. The trifold portion b is sewn by the sewing needle 27 at the position of the feed dog. For a relatively thin towel web A, for example, 2
The sewing is performed at a feed speed of about 5 m / min. However, for a thick portion a1 which is thickened by weaving a pattern with a high density, the feed speed is reduced to about half (deceleration is selected according to the thickness. Is slowed down). Adjustment of the feed speed and the sewing speed of the sewing machine are performed by the inverter motor M for the feed means 10.
1, M2 and a sewing machine motor (mounted on a table vertically suspended from the lower part of each sewing machine, but omitted in the drawing).

The slider 19A and the sewing machine 26
Mounting base 1 movably mounted via rails R extending in the transverse direction of.
On rails 9 and 29, rails 19a and 29 such as linear way
a so as to be movable via a. Mounting stand 19, 2
9 is provided with air cylinders 4 and 5 for reciprocating the cutting means mounting slider 19A and the sewing machine 26. That is, when the air cylinders 4 and 5 are contracted from the extended positions, the slider 19A and the sewing machine 26 move inside each other. The shift position of each slider 19A and the inside of the sewing machine 26 is appropriately adjusted by providing a stopper. The mounting tables 19 and 29 have screw rods 18A and nuts 18B and 46a screwed to the ball screw 46 fixed to the lower surface, and the screw rod 18A and the ball screw 46 are rotated by a handle or a motor, so that the original towel A is rotated. Initially, the slider 19A and the sewing machine 26 are set at appropriate positions according to the width. At this time, the air cylinders 4 and 5 are in an extended state. Reference numeral 48 in the drawing denotes a sewing thread bobbin support, and reference numeral 49 denotes a sewing machine upper thread bobbin supported by the same.

After the sewing of the ears a is completed, the raw towel web A is conveyed by the rear feed roller 12 to, for example, the folding device 50 in the next step. The rear feed roller 12 is also driven in the direction of the arrow by the inverter motor M2 so that the speed can be changed.
Although the peripheral speed is set slightly higher than the feed speed of the sewing feed dog 26a, the sewing speed of the feed tooth 26a is also reduced when sewing the ear a of the thick portion a1.

Next, the use of the sewing machine 1 according to the embodiment having the above-described configuration will be described. First, towel fabric A
, The distance between the left and right sliders 19A and the sewing machine 26 is set by turning the screw rod 18A and the ball screw 46,
The cloth holder 40 is also set as described above, and the thick-section detectors 31L and 31R are also set to the left and right ears a where the difference in thickness is large. The user introduces the thin standard portion at the end of the towel web A into the spiral guides 25L and 25R by hand to form a three-fold portion, performs trial sewing, and performs initial setting. then,
Enter automatic operation.

The thick part a1 is a thick part detector 31L, 31R.
, The distance from the thick section detectors 31L, 31R to the cutting means 22L, 22R and each front end of the spiral guides 25L, 25R is constant, and corresponds to each distance to the rotary encoders 20L, 20R of the controller. The arrival of the thick portion a1 to the resection means 22L, 22R is calculated because the number of pulses that have been input is input. The air cylinders 4 and 4 are contracted, the cutting means 22L and 22R are shifted inward via the slider 19A, and the side edges (ears) a of the thick portion a1 are lightly scraped off. After the scraping, the slider 19A is returned to the original position by extending the air cylinders 4, 4. Further, the arrival of the thick part a1 to the spiral guides 25L, 25R is calculated by the rotary encoders 20L, 20R, and immediately before reaching the spiral guides 25L, 22R, the feed speed of the feed means 10 and the sewing of the plain sewing machines 26L, 26R. Slowing speed and left and right spiral guides 25L, 25R and sewing machine 26
L and 26R are slightly shifted inward by the air cylinders 5 and 5.

The trifold portion b of each ear a of the thick portion a1
1, b1 is formed reliably (without the end thread protruding or becoming extremely thick), and these
Sewing is performed to ensure a good finish with L and 26R. After the sewing, the feed speed of the feed means 10 and the sewing speed of the sewing machine are returned to the original speeds, and the spiral guides 25L, 25L
The R and the sewing machines 26L, 26R are returned to their original positions by extension of the air cylinders 5, 5. Cutting means 2
The 2L and 22R scraping ends are also finished with the plain sewing machine 26.
The end of sewing of L and 26R is
In L and 20R, the length of the thick portion a1 is converted into the number of pulses corresponding to the feed amount of the feed means 10 (the moving distance of the raw towel web A) and grasped and estimated.

In the following, the order and length of thick portions having different lengths are stored in the control means so that the end of sewing is estimated. In addition, when the thick part a1 is folded in three by the spiral guides 25L and 25R, the roller may be fed laterally and outwardly by a rotating roller, or auxiliary means may be added. In addition to the raw towel cloth A, the lock sewing machine 1 can also be applied to ear sewing of a blanket or a curtain fabric.

In addition to the above-described embodiment, in a sewing machine,
When a scalpel of a chain stitch sewing machine is used as the cutting means,
With the sewing needle of the chain stitch sewing machine in the operating state, flat stitching together with the mounting table 29 is performed on both side edges a of a long object such as a raw towel web A having a substantially uniform weave in which thick thick portions are not mixed. A chain stitch is performed by moving the sewing machine 26 away from the outside, or conversely, a chain stitch sewing machine is applied to both side edges a of a thin, substantially woven towel raw material such as a bath towel. It is possible to carry out tri-folding and sewing with only the plain stitch sewing machine 26 by moving the mounting table outward and away.

If it can be cut off by the cutting means, the slider 19A is omitted, and it is directly mounted on the mounting table 19, and the towel raw material A is made to stand by while moving along the meandering, and is cut off by the thick part reaching signal. A configuration for performing drop-off resection can be adopted. As the distance measuring means, a timer can be used in place of the rotary encoders 20L and 20R, and the arrival at the thick portion can be easily confirmed. In the above embodiment, the thick portion detecting means 31L and 31R directly detect the thick portion 21. However, a step which is clearly distinguished between the pile weave and the plain weave at a position separated from the thick portion 21 by a predetermined distance. The thick part 21 can also be detected indirectly by the part.

[0036]

As is apparent from the above description,
The sewing machine according to the second aspect of the present invention has the following excellent effects. (1) It is possible to fold and sew both side edges of a long towel having a thick portion in the longitudinal direction securely and in a good format even if there is meandering.

In the sewing machine according to the present invention, a plain sewing machine is used as the sewing machine, and a lower fixed blade is engaged with the lower fixed blade like a knife of a chain stitch sewing machine as a means for cutting both side edges of the long thick part, and moves up and down. When using the movable blade and each,
Speedy and clean resection can be performed without distorting the side edges of the thick part.

In the sewing machine according to the third aspect, the cutting means is mounted on the moving means via a cylinder for shifting the cutting means slightly inward by the thick portion reaching signal and a cutting means mounting slider. In the thin portion, it is made to stand by outside the both side edges, and in the thick portion, the cut is made to both side edges (ears) by the thick portion reaching signal, so that the cut portion can be scraped off without leaving a cut piece, and the meshing can be performed. A cutting means comprising a lower fixed blade and a vertically movable blade which may stop in a state can also be used.

In the sewing machine according to the fourth aspect, the moving means includes a screw rod rotated by a reversible motor, a nut screwed to the screw rod, and a cutting means mounting base attached to the nut. The responsiveness to the meandering of a long object can be improved with a simple configuration.

In the sewing machine according to the fifth aspect, a rotary encoder is used as the distance measuring means to improve the cutting accuracy of the side edge of the thick portion. In the sewing machine according to the sixth aspect, the timer is used as the distance measuring means. As a result, it is possible to simplify the arrival confirmation to the long thick part.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a sewing machine according to a representative embodiment of the present invention.

FIG. 2 is a right side view of the sewing machine shown in FIG. 1;

FIG. 3 is a perspective view showing a main part of only the left side of the sewing machine of FIG. 1;

FIG. 4 is an elevational view of the left-side moving unit.

FIG. 5 is an explanatory view showing a tri-folded state of a thick ear portion, which has been a conventional problem.

[Explanation of symbols]

 Reference Signs List 1 sewing machine 4 cylinder 10 feed means 15L, 15R moving means 16L, 16R meandering detecting means 17 reversible motor 18A screw rod 18B nut 19 cutting means mounting base 19A slider 20L, 20R distance measuring means (rotary encoder) 22L, 22R thick part Side edge cutting means 25L, 25R Tri-folding means (spiral guide) 26L, 26R Sewing machine (plain stitch sewing machine) 31L, 31R Thick part detecting means A Raw towel web (long material) a1 Thick part a Side edges (ears)

Claims (6)

(57) [Claims] 1. A long object having a thin part and a thick part, such as a raw towel, driven and driven by a feeding means can move toward and away from the long object on both sides of a machine base perpendicular to the longitudinal traveling direction. A long-sided object side edge tri-folding means installed in front of the sewing machine; a moving means provided in front of the tri-folding means so as to be able to reciprocate in the orthogonal direction; Means are both side edge cutting means installed so as to be able to cut at each side edge of the running long object, and installed directly before the cutting means, and directly or indirectly detects the thick part, A thick portion detecting means for transmitting a thick portion detection signal during the operation; and a long object between the detecting means and the cutting means at least by the thick portion detection signal driven by the traveling long object. Measure the travel distance and apply the above A distance measuring means for transmitting a thick part reaching signal at the position where the hand has arrived and causing the cutting means to perform a cutting operation; and a distance measuring means provided on the moving means adjacent to the cutting means and in front of the cutting means. A means for detecting a meandering of a long object and moving the moving means so as to follow the meandering, and detecting means for a side edge of the long object. A sewing machine for both side edges of a long object. 2. A flat stitch sewing machine as the sewing machine, and a lower fixed blade like a knife of a chain stitch sewing machine and a movable blade which meshes with the lower fixed blade and which moves up and down as the scalpel of the chain stitch sewing machine as the means for cutting off the both sides of the long thick part. Item 2. A sewing machine according to item 1, wherein both edge portions of the long object are sewn. 3. The long object according to claim 1, wherein the cutting means is mounted on the moving means via a cylinder and a slider for moving the cutting means inward by the cutting operation signal. Sewing machine on both side edges. 4. The moving means according to claim 1, wherein said moving means comprises a screw rod rotatably driven by a reversible motor, a nut screwed to said screw rod, and a cutting means mounting base attached to said nut. A sewing machine for both side edges of a long object described in Crab. 5. The sewing machine according to claim 1, wherein the distance measuring means is a rotary encoder. 6. The sewing machine according to claim 1, wherein the distance measuring means is a timer.