JP2002035455A - Triply folded cloth feed mechanism of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the triply folded cloth feed mechanism of a sewing machine for preventing a deviation caused by resistance by a bending operation when folding triply the cloth end of fabric in a sewing machine. SOLUTION: A cloth-backing 12 is provided t the upper portion of a triple roll guide 7 arranged in front of a sewing-machine needle 2, a cloth-feeding belt 20 that can travel in the cloth feed direction of a sewing machine 1 is pressed and arranged on the upper surface of the cloth-backing plate 12 so that the cloth feel belt 20 can face the sewing-machine needle 2, and the cloth end that is configured so that cloth for triple rolling can be transported while the cloth for triple rolling is pressed and retained by the cloth-backing plate 12 and the cloth-feeding belt 20 is subjected to triple roll sewing using the triple roll cloth feed mechanism of the sewing machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-ply cloth feed mechanism for a sewing machine which sew three ends of a cloth. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-roll cloth feeding mechanism of a sewing machine that transfers a three-roll cloth while directly pressing and holding the three-roll cloth at an upper portion of a winding guide.

[0002]

2. Description of the Related Art As shown in FIGS. 4 to 6, a conventional three-winding cloth feeding mechanism 35 for sewing three ends of a cloth is wound three times in front of a sewing needle 2 (see FIG. 7). ) Is provided with a long (with a length of about 450 mm) triple winding guide 36, and the sewing machine needle 2 is positioned beside the three winding guide 36 and the sewing needle 2 from the setting position 41 of the fabric M. The cloth receiving plate 40 extending to a position beyond the position is arranged, and one cloth for transferring the cloth M in the cloth feeding direction (arrow Y direction) of the sewing machine 1 while pressing the cloth M on the upper surface of the cloth receiving plate 40. A feed belt 43 is provided,
By operating the cloth feed belt 43 alone or in synchronization with the sewing feed of the sewing machine 1, the cloth M set on the cloth receiving plate 40 is transferred, and during the transfer, the cloth ends first. The three-turn guide 36 is engaged with the three-turn guide 36 to form a three-turn, and then the three-turn portion H is sewn with the sewing needle 2.

[0003]

As shown in FIG. 6, the conventional three-winding cloth feeding mechanism 35 has a three-winding section H with a cloth feeding belt 43 disposed on the side of a three-winding guide 36. Since the fabric M is configured to be wound three times by transferring the fabric M on the side while pressing the fabric M, the fabric end portion of the fabric wound three times protruding from the fabric feed belt 43 becomes longer, and the fabric end portion becomes longer. When passing through the inside of the three-volume guide 36, the fabric end portion is long if it receives the resisting force due to the bending action of the three-volume guide 36. 36, the winding of the fabric for three windings is often insufficient, and wrinkles are often formed in the three windings H. In particular, in a soft or stretchy fabric, the displacement increases.
In some cases, it is impossible to make three rolls and it becomes two rolls (punk). To improve it, a three-roll guide with low resistance is necessary. It required high skill and skill. On the other hand, in the case of a hard cloth, the resistance of the three-winding guide 36 becomes large, so that a strong clamping force is required for the cloth feed belt. Therefore, the clamping force is increased.
Nevertheless, displacement often occurred at the cloth feed belt portion, resulting in three winding defects. Therefore, in order to improve such a problem, it is necessary to attach the cloth feed belt as close to the cloth edge as possible, but the conventional method has a limitation.

Therefore, the present invention employs two cloth feed belts to form a two-stage interlocking system. In front of the sewing machine needle 2, the cloth receiving plate 12 and the cloth feed belt 20 It is a technical object of the present invention to provide a three-roll cloth feeding mechanism for a sewing machine that solves the above-described problem by transferring the upper roll h while pressing and holding the upper part h of the three-roll section H. is there.

[0005]

That is, in the sewing machine three-winding cloth feeding mechanism according to the present invention, a cloth receiving plate 12 is provided on an upper part of a three-winding guide 7 disposed in front of the sewing machine needle 2. A cloth feed belt 20 movable in the cloth feed direction of the sewing machine 1 is disposed on the upper surface of the cloth receiving plate 12 by pressure contact so as to face the sewing machine needle 2. At 20, a three-roll sewing is performed on the cloth end configured to transfer the three-roll fabric while being pressed and held.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view schematically illustrating a three-roll cloth feeding mechanism 6 of a sewing machine according to the present invention. In FIG. 1, the lower side is the front part of the sewing machine 1 and the upper part is the rear part of the sewing machine 1. FIG. 2 is a right side view of the three-roll cloth feeding mechanism 6 of the sewing machine shown in FIG.
Reference numeral 3 denotes a cloth presser foot, and reference numeral 4 denotes a cloth feed dog.
And the cloth is fed to the sewing machine 1 by the cloth feed teeth 4.

In front of the sewing needle 2, a three-winding guide for folding the cloth edge inward (hereinafter simply referred to as “three-winding”) as shown in FIGS. 7
The three-turn guide 7 is provided with an outlet 8 which faces the fabric presser foot 3 along the fabric feed direction (the arrow Y direction) of the sewing machine 1.
The length of the cloth from the entrance 9 of the three-volume guide 7 is gradually bent as it advances through the three-volume guide 7, and the three-volume When exiting from the exit 8 of the guide 7, a three-volume H as shown in FIG. 7 is completed.

Then, on the upper part of the three-volume guide 7,
As shown in FIG. 3, a cloth receiving plate 12 for mounting a cloth (for example, pocket cloth) 30 to be wound three times is provided horizontally, and this cloth receiving plate 12 is shown in FIGS. As described above, the area 13 (hereinafter, referred to as a section 13) in which a single plate is formed from a single plate continuous from a position about 300 mm before the entrance 9 of the three-volume guide 7 to a position about 200 mm behind the sewing needle 2 and sets the three-ply cloth 30. , Simply referred to as "set area") and fabric 3
Area 14 where three ends of the cloth are wound while transferring
(Hereinafter, simply referred to as “three-turned area”), and an area 15 (hereinafter, simply referred to as “stitched area”) to which the three-turned portion H is sewn while transferring the fabric 30.

As shown in FIG. 1, the right end of the cloth receiving plate 12 in the set area 13 projects about 100 mm to the right from the sewing needle 2 and the right end of the cloth receiving plate 12 in the three-turn area 14 is formed. Is located approximately 3 mm left from the upper end of the right curved surface 10 of the three-turn guide 7 as shown in FIG. The right side of the cloth receiving plate 12 in the sewing area 15 is approximately 10 m from the cloth presser foot 3 as shown in FIG.
m to the left.

In addition, the cloth receiving plate 1 in the set area 13
As shown in FIG. 1, a ruler 18 for abutting the right end of the fabric 30 on the upper surface of the fabric 2 and for inserting the fabric 30 straight under a front fabric feed belt 20 described later is provided.

On the upper surface of the cloth receiving plate 12, two cloth feed belts for transferring the cloth 30 in the cloth feed direction (the direction of arrow Y) while pressing the cloth 30 are provided as shown in FIG. The cloth feed belt is knitted in a two-stage interlocking manner, and a first cloth feed belt (hereinafter, simply referred to as a “front cloth feed belt”) 20 is set so as to face the sewing machine needle 2. A second cloth feed belt (hereinafter, simply referred to as a “back cloth feed belt”) 21 is arranged on the upper part of the winding guide 7 and is arranged on the side of the sewing needle 2.

This front cloth feed belt 20 is shown in FIG.
As shown in FIG. 2, the belt is passed over a drive pulley 22 disposed in the set section 13 and an intermediate driven pulley 23 disposed in front of the sewing machine needle 2. It is looped over a rear driven pulley 24 disposed at the rear end of the sewing area 15.
The front and rear cloth feed belts 20 and 21 are pressed against the upper surface of the cloth receiving plate 12 by the action of a spring (not shown).

As shown in FIG. 2, a plurality of tension pulleys 25 are provided between the pulleys of the front and rear cloth feed belts 20 and 21 for appropriately pressing the lower part of the cloth feed belt. And these tension pulleys 2
Due to the pressing action of 5, the lower part of the cloth feed belt evenly contacts the upper surface of the cloth receiving plate 12.

A drive motor (for example, a pulse motor or a servomotor) 27 provided on the right side of the set section 13 is connected to the drive pulley 22 of the front cloth feed belt 20, as shown in FIG. This drive motor 27
By driving the driving pulley 2 as shown in FIG.
The cloth feed belts 20 and 21 are rotated in the cloth feed direction of the sewing machine 1 (in the direction of the arrow Y) via the sewing machine 1.

The operation sequence of the three-roll cloth feeding mechanism thus configured is controlled by microcomputer control or sequence control.

[0016]

Next, the operation of the three-fold cloth feeding mechanism 6 of the sewing machine 1 that sews three pocket cloths will be described. First, an operator places the pocket cloth 30 on the cloth receiving plate 12 in the setting area 13 as shown in FIG. 1, and abuts the cloth end against the ruler 18. Next, the worker puts the pocket cloth 30 under the front cloth feed belt 20 while following the ruler 18. Then, the first cloth detection sensor (not shown) is turned ON, the operation is started, and the drive motor 27 is started,
The front and rear cloth feed belts 20 and 21 are operated to start transferring the pocket cloth 30 in the cloth feed direction of the sewing machine 1 (arrow Y direction). Then, during this transfer, the cloth end portion of the pocket cloth 30 enters the triple winding guide 7 from the entrance 9 and starts to be bent by the bending action of the triple winding guide 7.

When the pocket cloth 30 moves while the end of the cloth is bent and passes through the first cloth detection sensor, the first cloth detection sensor is turned off. The drive motor 27 stops when the pocket cloth 30 moves about 15 mm from the time when it is turned off, and stops the front and rear cloth feed belts 20 and 21.

Next, the worker operates the second pocket cloth 3.
0 is inserted under the front cloth feed belt 20 along the ruler 18 in the same procedure as described above. Then, the first cloth detection sensor is turned on, and the front and rear cloth feed belts 20 and 21 are turned on.
Operates to transfer the first pocket fabric 30 and the second pocket fabric 30. Then, during this transfer, the cloth end portion of the first pocket cloth 30 is formed into three windings by the bending action of the three-winding guide 7 as shown in FIG.
It exits from the exit 8 of the three-volume guide 7 and enters below the presser foot 2.

Then, the second cloth detecting sensor (not shown) arranged on the side of the presser foot 2 is turned on, the sewing machine needle 2 is started, and the first three-folded portion H of the pocket cloth 30 is sewn. start. At the same time as the sewing needle 2 starts,
The front and rear cloth feed belts 20, 21 move in synchronization with the sewing feed of the cloth feed teeth 4 of the sewing machine 1, and the first pocket cloth 3 is moved.
With 0, the second pocket fabric 30 is transferred. When the second pocket fabric 30 is moved and the first fabric detection sensor is turned off, the second pocket fabric 30 is moved by about 15 mm from the time when the first pocket fabric sensor 30 is turned off, and then the front and rear fabric feed belts 20 and 21 are moved. The sewing needle 2 stops.

Next, the worker sets the third pocket cloth 3
When 0 is inserted under the front cloth feed belt 20 in the same procedure as described above, the front and rear cloth feed belts 20, 21 and the sewing machine needle 2 are simultaneously operated to transfer the three pocket cloths 30, 30, 30. With the three windings H of the second pocket fabric 30
Sewing. During this transfer, the first pocket fabric 30
Is to cut a sewing thread formed in a gap (about 15 mm length) with the second pocket fabric 30 by a thread cutting device (not shown) provided at the rear of the sewing needle 2 and then to the rear of the sewing machine 1. Sent out to

Thereafter, the operator repeats the above operation by inserting a new pocket cloth 30 under the front cloth feed belt 20 in the same operation as above, and automatically trims the cloth end of the pocket cloth 30 by three times. Wrap and sew

[0022]

According to the present invention, the three-winding cloth is transferred while being pressed and held at a position near the cloth end by the cloth receiving plate 12 and the cloth feed belt 20 above the three-winding guide 7. Therefore, even if resistance is exerted by the action of folding into three windings in the three-winding guide 7, the parallel displacement of the cloth end portion is reduced, and a high quality three-turn winding can be obtained. In addition, even in the case of three windings of a hard cloth, a deviation in a cloth feeding belt portion hardly occurs.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a three-wrap cloth feeding mechanism of a sewing machine according to the present invention.

FIG. 2 is a right side view of the three-wrap cloth feeding mechanism of the sewing machine shown in FIG. 1;

FIG. 3 is a perspective view of the three-roll cloth feeding mechanism of the sewing machine shown in FIG.
It is A sectional drawing.

FIG. 4 is a plan view schematically showing a conventional three-roll cloth feeding mechanism of a sewing machine.

FIG. 5 is a right side view of the three-wrap cloth feeding mechanism of the sewing machine shown in FIG. 4;

FIG. 6 is a perspective view of the sewing machine shown in FIG.
It is B sectional drawing.

FIG. 7 is an explanatory view showing a form of a cloth in which three cloth end portions are wound.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Sewing needle 7 Three winding guide 12 Cloth receiving plate 20 Cloth feed belt

Claims (1)

[Claims] 1. A cloth receiving plate 12 is provided above a three-winding guide 7 disposed in front of a sewing needle 2. A cloth feeding belt movable on the upper surface of the cloth receiving plate 12 in the cloth feeding direction of the sewing machine 1. 20
Is arranged so as to face the sewing needle 2, and the cloth end is transported in a state where the cloth for three windings is pressed and held by the cloth receiving plate 12 and the cloth feed belt 20 above the three winding guides 7. Sewing machine's three-fold cloth feed mechanism that sew three-ply sewing.