JPH077892Y2 - Detecting device for sewing end point of darts sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a sewing end point detecting device for detecting whether or not a sewing length reaches a desired length in a darts sewing machine.

[Conventional technology]

Dart stitching is performed by stitching a piece of cloth whose back surface is exposed outward and bending it as shown in FIG. 7, and forming a loop-shaped fold W ₃ as shown in FIG. 8 on the back surface Wa of the cloth W. It is one of the suture forms that is applied to various parts of clothing such as skirts and pants.

The sewing machine to perform the dart sewing, currently, this is detected when the sewing operation has reached the cloth edge W ₂ is a sewing end point from the sewing start position W _1, those to stop automatically sewing operation known The sewing end point is detected in the following manner.

That is, as shown in FIG. 9, an optical sensor SE composed of a light emitter / receiver is provided behind the suture needle N held by the sewing machine main body M in the cloth conveying direction, and the cloth W moves in the direction of the sewing operation. When the cloth end W ₂ moves in the direction of the mark A and passes the detection point P of the optical sensor SE, the sensor SE detects this and activates the timer, and the distance t ₁ from the sewing start point W ₁ to the detection point P is increased. The sewing operation was to be terminated when the minute sewing time had elapsed.

However, using the optical sensor SE as described above, the cloth edge W ₁
Is detected and the sewing operation is ended based on the detection result, the length l to be sewn is the distance t ₁
When the length is shorter, the cloth edge W ₁ is already located in front of the sensor SE in the sewing direction when the cloth is set, which causes a problem that the sensor SE cannot perform detection.
Therefore, what is shown in FIG. 10 is implemented to solve the above problem. The reed switch SW is provided in the outer cylinder portion CL ₁ of the cylinder CL that drives the cloth conveying member (not shown), and the moving position of the magnet MG provided at the tip of the cylinder rod CL ₂ is detected. is there.

That is, the magnet MG in the initial state and the reed switch
The interval t with SW is made to match the length l to be sewn,
When the interval t becomes 0 due to the operation of the cylinder CL,
That is, when the cloth is conveyed by the length l, the reed switch SW detects this and stops the driving of the sewing machine.

According to this, it is possible to accurately detect the end of sewing regardless of the length of the sewing length l.

[Problems to be solved by the device]

However, in the above-mentioned conventional sewing length detecting device,
Since the reed switch SW is attached to the outer cylinder portion CL ₁ of the cylinder CL with the mounting bracket R and the screw b for fastening the same, the reed switch SW is
Each time the SW mounting position is changed, the metal fitting R
And the screw b must be attached and detached, and the magnet MG is housed in the cylinder CL. It is difficult to know the exact initial position from the outside, and the reed switch
A lot of labor and time are required for changing the SW mounting position, which causes a decrease in productivity.

Further, the cylinder CL is usually provided on the side of the sewing machine main body M so as not to interfere with the sewing work, and cloths to be sewn are laminated around the sewing machine main body M, so that the operator can approach the vicinity of the cylinder CL. In many cases, it is difficult to carry out the above-mentioned change work under such circumstances.

This invention was made in view of the above-mentioned problems, and it is possible to reliably detect the sewing end point for any sewing length, and it is possible to easily respond to changes in sewing length. An object of the present invention is to provide a sewing end point detection device for a darts sewing machine that can be used.

[Means for Solving the Problems]

This invention is a dart sewing machine in which cloth is conveyed by a long plate-like cloth conveying member that slides on a sewing machine table, and a setting member having optical characteristics different from the upper surface of the cloth conveying member is provided on the upper surface of the cloth conveying member. It is provided so as to be movable parallel to the cloth conveying direction, and a scale in which the relative movement amount of the cloth conveying member and the setting member is converted into the cloth conveying amount is provided on any one of the members, and together with the cloth conveying member. An optical sensor for detecting whether or not the moving setting member has reached a predetermined detection point on the moving path is fixedly installed above the sewing machine table.

[Action]

In this invention, when performing the sewing operation, first,
The setting member is moved on the cloth conveying member to set the distance from the detection point to the setting member. In this distance setting, the worker performs the setting work according to the value of the scale attached to the cloth conveying member or the setting member. That is, when the sewing length to be actually formed is 1, the distance from the detection point indicated by the scale is also set to be 1.

After that, when the sewing operation is started, the setting member moves together with the cloth conveying member that conveys the cloth, and when the setting member reaches the detection point, the optical characteristics at the detection point change. The sensor detects and stops the sewing machine. Since the movement amount of the setting member at this time is set on the basis of the scale converted into the cloth conveyance amount, the desired sewing length can be reliably formed when the sewing machine is stopped.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

First, a cloth conveying mechanism of a darts sewing machine to which the present invention is applied will be described with reference to FIG.

In the figure, a supporting plate 2 which can be moved back and forth and a mounting plate 5 connected to the supporting plate 2 by two upper and lower leaf springs 3 and 4 are provided on the side of the sewing machine table 1. Of these, the mounting plate 5
A cloth conveying member 7 is provided on one side surface of the support plate 2 via a mounting member 6, and one side surface of the support plate 2 is an elevating / lowering drive mechanism UD as an elevating / lowering drive unit for vertically moving the mounting plate 5.
Is provided. The lifting drive mechanism UD includes an air cylinder 9 held on one side surface of the support plate 2 via a holding block 8 and an arm body 10 connected to a cylinder rod 9a of the air cylinder 9. Is rotatably attached to the support plate 2 by a shaft 11, and its rear end is rotatably connected to the attachment member 6 via a connecting lever 12. Then, when the air cylinder 9 operates and the cylinder rod 9a projects, the arm body 10 rotates accordingly and presses the mounting member 6 via the connecting lever 12, so that the cloth conveying member 7 is placed on the sewing machine table 1. Descend on the placed cloth,
Press the cloth. On the contrary, when the cylinder rod 9a of the cylinder 9 is retracted, the cloth conveying member 9 rises above the sewing machine table 1.

On the other side surface of the support plate 2, horizontal drive means HD for horizontally moving the support plate 2 and the attachment plate 5 along the upper surface of the sewing machine table 1 is provided. The horizontal driving means HD comprises a cloth conveying cylinder 14 having an outer peripheral portion 14b fixed to the other side surface of the support plate 2 via a holding member 13, and a reverse stitching cylinder 15 connected to the cloth conveying cylinder 14.
14 and 15 are connected to each other at the tips of the cylinder rods 14a and 15a. In addition, the reverse stitching cylinder 15 is
15b is fixed to the machine frame by a fixing member 16.
Then, in response to the operation of both cylinders 14 and 15, the outer cylinder portion 14b of the cloth conveying cylinder 14 advances and retracts, the supporting plate 2 and the mounting plate 5 move in the front-rear direction, and the cloth conveying member 7 causes the suture needle N to move.
The side of is moved back and forth in the cloth conveying direction.

Further, 17 is a mounting arm at the rear end of the reverse-feeding cylinder 15
The optical sensor is fixed via 18.

The optical sensor 17 is a reflective optical sensor composed of closely arranged light projecting unit and the light receiving portion, from the projecting portion as shown in FIG. 5, toward the flat portion 7a ₁ of the fabric conveying member 7 Light Is sent. If this light is reflected at the irradiation position (detection point), the light receiving unit receives it and outputs a suture operation stop signal to the sewing machine main body. Reference numeral 17a is a pilot lamp that lights up when the light receiving section receives light (when the optical sensor operates), and 17b is a sensitivity adjusting screw of the light receiving section.

2 and 3 are a perspective view and a plan view showing the cloth conveying member 7, respectively.

As shown in the figure, the cloth conveying member 7 has a long L-shaped cross section extending in the cloth conveying direction, and the flat plate portion 7a has a flat surface portion 7a ₁ and a flat surface portion 7a _2. Has been formed. Also,
The fabric conveying member 7, while being formed by iron, plan view 7a ₁ of the light from the optical sensor 17 described above is irradiated has a non-reflective properties.

A setting member 19 formed of a magnet is attracted to the flat plate portion 7a of the cloth conveying member 7. As shown in the side view of FIG. 4 (b), both ends 19a and 19b of the setting plate 19 have a bent shape that matches the upper surface of the flat plate portion of the cloth conveying member 7. The side 7a ₃ where the flat surface portion 7a ₁ and the sloped surface portion 7a ₂ intersect is used as a guide so that it can move in parallel with the cloth conveying direction. Further, the upper surface of the setting member 19 is finished to have a surface state capable of sufficiently reflecting the light projected from the sensor, and a scale 20 is engraved therein (see FIG. 4). The scale 20 is used for the cloth conveying member 7 during sewing.
The amount of movement of the setting member 19 that moves together with the setting member 19 is converted into a sewing length, and it is possible to confirm how many cm the setting member 19 has moved in the sewing operation depending on how many scales the setting member 19 has moved. For example, when the setting member 19 moves one scale, 1c
It shows that the sewing of m has been performed. Therefore, in this embodiment in which linear sewing is performed, since the moving amount of the setting member 19 and the sewing length match, the setting member 19
19 has the same scale as a normal scale in mm or cm.

Reference numeral 21 is an index indicating the scale, which is attached to the slope 7a ₂ of the cloth conveying section 7.

Next, the operation will be described based on the above configuration.

After setting the cloth on the sewing machine table 1, the operator actuates the elevating and lowering drive means 10 to lower the cloth conveying member 7 and fix the cloth. Next, the setting member 19 is moved on the cloth conveying member 7, stopped at the position where the optical sensor 17 is switched from the non-operating state to the operating state, and the numerical value indicated by the index 21 is read. In addition,
Whether or not the optical sensor 17 is activated is determined by whether or not the pilot lamp 17a provided in the optical sensor 17 is turned on.
After that, the setting member 19 is moved along the cloth conveying member 7 to the front in the cloth conveying direction, and the difference between the graduation value indicated by the index and the graduation value (sewing start value) read previously is required. The setting member 19 is fixed at a long position (sewing end value).

Here, when the start switch of the sewing operation is pressed, first, the reverse stitching cylinder 15b of the horizontal drive means HD is operated to reciprocate the cloth conveying member 7 for a predetermined distance from the sewing start point. As a result, as shown in FIGS. 6 (a) and 6 (b), a constant reverse stitch S ₁ is performed in front of the sewing start point P. After that, the cloth conveying cylinder 14 operates, the cloth conveying member 7 starts to move forward, and when the stitch S ₂ is formed rearward from the sewing start point P, the setting member 19 causes the optical sensor 17 to move at that time. The light that has reached the detection point of 1, and is emitted from the light projecting unit of the optical sensor 17 is reflected by the upper surface of the setting member 19 and enters the light receiving unit.

As a result, the optical sensor 17 is brought into an operating state, a sewing stop signal is output to the sewing machine main body M to stop the driving of the sewing machine, and the pilot lamp 17a is turned on. Until the setting member 19 reaches the detection point, the light sent from the optical sensor 17 irradiates the cloth conveying member 7 having the non-light reflecting characteristic, so that the driving of the sewing machine is not stopped.

As described above, in this embodiment, since the driving of the sewing machine is stopped when the setting member 19 reaches the detection point, as shown in FIGS. 6 (a), 6 (b) and 6 (c). In advance,
If the setting member 19 is moved backward from the detection point by the sewing length, the required sewing length can be reliably obtained when the sewing machine stops.

Further, since the operator does not have to move from the sewing work position when positioning the setting member 19, the sewing length can be changed extremely easily. Note that FIG. 6 shows a case where the index 21 is attached so that the sewing start value becomes “0”, and according to this, when positioning the setting member 19,
It is sufficient to match the same scale value as the sewing length with the index 21 without obtaining the difference between the sewing end value and the sewing start value as described above. In this case, the positioning work of the setting member 19 is further simplified. Can be converted.

[Effect of device]

As described above, according to the present invention, it is possible to reliably detect the sewing end point for any sewing length, and it is possible to extremely easily perform the sewing length changing operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view of the cloth conveying member shown in FIG. 1, FIG. 3 is a plan view of what is shown in FIG. 1, and FIG. 3A is an enlarged plan view of the main part of what is shown in FIG. 3, FIG. 5B is a side view of what is shown in FIG. 3A, and FIG. 5A is the optical sensor shown in FIG. The front view shown in the figure, the figure (b) is a side view of what is shown in the figure (a), FIG. 6 is a plan view showing the sewing state by what is shown in FIG. 1, and FIGS. 7 and 8 are darts stitches. Is a perspective view showing
9 is a side view showing a sewing end point detecting device for a darts sewing machine, FIG. 10 is a side view showing another conventional sewing end point detecting device for a darts sewing machine, and FIG. 11 is shown in FIG. It is a principal part expansion explanatory side view of a thing. HD ... horizontal driving means (driving means) UD ... elevating driving means (driving means) 19 ... setting member 20 ... scale 17 ... optical sensor 7 ... cloth conveying member

Claims (2)

[Scope of utility model registration request] 1. A long plate-shaped cloth conveying member which moves up and down and slides on the sewing machine table by a predetermined driving means, and the cloth conveying member lifts and lowers a cloth placed on the sewing machine table. In the darts sewing machine configured to be transported according to the above, a setting member having optical characteristics different from that of the upper surface of the cloth conveying member is movably provided in parallel with the cloth conveying direction, and Whether a scale in which the moving amount of the moving setting member is converted into the cloth conveying amount is provided on any one of the members, and whether the setting member moving together with the cloth conveying member has reached a predetermined detection point in its movement path A sewing end point detecting device for a darts sewing machine, wherein an optical sensor for detecting whether or not the sewing machine is fixed is provided above the sewing machine table. 2. The sewing end point detecting device for a darts sewing machine according to claim 1, wherein the cloth conveying member is formed of a non-light reflecting member, and the setting member is formed with a light reflecting portion on an upper surface thereof. .