JP2586594Y2 - Belt loop set defect detection device for sewing machine with belt loop - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt loop setting defect detecting apparatus for a belt loop sewing machine for sewing a belt loop to a waist such as pants.

[0002]

2. Description of the Related Art A belt loop is provided in which a belt loop tape is sent out for a predetermined length and cut, and both ends thereof are folded and moved to a sewing position. Sewing machines are conventionally known. The detection of the presence or absence of a belt loop in the sewing machine is performed by a photo sensor or the like when the belt loop is cut or both ends are folded.

[0003]

In the process of supplying the belt loop to the sewing position, the detection of the presence or absence of the belt loop is performed at the sewing position even if there is no problem when the belt loop is cut or both ends are folded. It is impossible to determine whether a loop has been supplied. Therefore, if the belt loop is not supplied to the sewing position for some reason or the supply state is not normal, when performing sewing automatically, the belt loop is not sewn to the waist such as pants, or a sewing error occurs. Occurs.

An object of the present invention is to reliably detect whether or not a belt loop has been set at a sewing position of a sewing machine with a belt loop.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, in the belt loop setting defect detecting device of the belt loop attaching sewing machine according to the present invention, a belt loop is supplied to a sewing position in a state where an end is folded. A sensor that detects the height of each presser foot that issues a signal indicating that there is a loop, and determines that the belt loop set is defective when a signal indicating that there is a loop is not issued from at least one of the sensors. .

[0006]

In the belt loop setting fault detecting device of the belt loop attaching sewing machine configured as described above, when each presser foot is lowered, the belt loop setting state is detected, and the supply is performed with the ends folded. If no cloth presence signal is issued from the sensor that has not been set, it is determined that the belt loop set is defective.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, referring to FIG. 1 and FIG. 2, an outline of a belt loop attaching sewing machine to which a belt loop set failure detecting device of the present invention is mounted will be described.

[0008] This belt loop attaching sewing machine performs a pair of tape feeding rollers (not shown) controlled to send a predetermined length of belt loop tape, receives the predetermined length of belt loop, and clamps and cuts. The belt loop receiving portion shown in FIG. 1, a pair of forks 8 for folding each end of the cut belt loop downward and moving the belt loop to a sewing position, and sewing the belt loop to a waist such as pants. The sewing section shown in FIG.

The belt loop receiving portion comprises a cutter 1 comprising a moving knife 1a and a fixed knife 1b arranged on the upstream side, and a front loop receiving plate 2a and a rear loop receiving plate 2 arranged downstream thereof.
b, a rear upper loop guide 3 and a front upper loop guide 4 arranged above the belt receiving plate 2, and a belt loop front guide metal lowered or raised with respect to the loop receiving plate 2 by the air cylinders 7, 7. 5a and guide loop 5 after belt loop
b) and a spring 6 for pressing the belt loop. Here, the belt loop sent out by the tape sending roller is put on the loop receiving plate 2 while being guided by the rear upper loop guide 3 and the front upper loop guide 4 from between the moving knife 1a and the fixed knife 1b. Then, the air cylinders 7, 7 are actuated, and the belt loop is pressed against the inner wall of the loop receiving plate 2 by the belt loop guide metal 5 and is held down by the springs 6, 6, and furthermore, the moving knife 1a is actuated and cut. You. Each end of the belt loop projects slightly from both sides of the loop receiving plate 2.

Each fork 8 moves forward or backward between a standby position behind the loop receiving plate 2, a folding position at both ends of the loop receiving plate 2 and a sewing position, and can rotate 180 degrees at the folding position. it can. That is, each fork 8 moves forward and sandwiches each end of the belt loop held on the loop receiving plate 2, and then rotates 180 degrees by a rotary cylinder or the like (not shown) to fold each end of the belt loop downward. Overlap to form a U-shape. And the air cylinder 7,
7 is deactivated and the springs 6,
Is further advanced to the sewing position by the action of a cylinder (not shown).

The sewing section includes a lockstitch sewing machine, a cloth presser lower plate 10 disposed on a needle plate 9 thereof, and two presser feet 1 disposed above the lower plate 10 so as to be vertically movable by an air cylinder 12.
It consists of one. Here, the belt loop supplied by the forks 8 onto the waist such as the pants on the presser foot lower plate 10 is clamped by the pressers 11. Then, sewing is performed by a sewing needle attached to the needle bar 13 through the hole 11a of the presser foot 11. At this time, in the case of a single needle, the cloth presser lower plate 10 is moved and sewn in accordance with a sewing needle by a cylinder (not shown), but in the case of a double needle, sewing can be performed simultaneously at two places.

The belt loop set defect detecting device of the present invention is attached to the lower portion of the air cylinder 12 at the sewing portion, and the waist such as pants on the presser foot lower plate 10 in a state where the belt loop B is folded downward. It has a sensor 14 for detecting the height of the presser foot 11, which emits a signal indicating that there is a loop (ON or OFF; hereinafter, described as ON) when supplied above. When at least one of the sensors 14 is off, it is determined that the belt loop setting is defective. As the sensor 14, for example, a proximity switch provided on a movable part in the air cylinder 12 and detecting the approach of a magnet can be employed. In addition,
A reflective photo sensor, a photo sensor including a light projecting unit and a light receiving unit, or the like may be attached to the presser foot 11.

In the belt loop set failure detecting device thus constructed, when each presser foot 11 descends, the belt loop set state is detected. As shown in FIG. 3A, when the belt loop B is set with its end folded below each presser foot 11, each sensor 14 is turned on, and then sewing starts. Also,
As shown in FIG. 3 (2), the belt loop B is
When not set below 1, each sensor 14
Is turned off. Further, as shown in FIG. 3C, when the belt loop B is not set under one presser foot 11, the sensor 14 which is not set is turned off. Only when in the state shown in FIG. 3A, it is determined that the set state is normal.

In the above-described embodiment, a signal indicating that a loop is present is generated when the sensor 14 is on, and a signal indicating that a loop is present is not output when the sensor 14 is off.
When the sensor 14 is off, a signal indicating that there is a loop may be issued, and when the sensor 14 is on, a signal indicating that a loop exists may not be issued.

[0015]

[Effects of the Invention] The present invention is configured as described above, and has the following effects.

That is, since the setting state of the belt loop at the sewing position can be automatically and reliably detected immediately before sewing, it is not necessary to check by an operator, and automation is possible. In addition, it is possible to detect not only the presence or absence of the belt loop but also whether or not the belt is properly set.

[Brief description of the drawings]

FIG. 1 is a perspective view of a belt loop receiving portion of a belt loop attaching sewing machine.

FIG. 2 is a perspective view of a sewing portion of a sewing machine with a belt loop.

FIG. 3 is a diagram showing a relationship between the belt loop set failure detecting device of the present invention and a belt loop set state;
(1), (2), and (3) are for normal operation, when there is no belt loop, and when setting is defective.

[Explanation of symbols]

 11 presser foot 12 air cylinder 14 sensor B belt loop

Claims (1)

(57) [Scope of request for utility model registration] 1. A sensor for detecting the height of each presser foot that emits a signal indicating that there is a loop when a belt loop is supplied to a sewing position in a state where the end is folded, and at least one of the sensors is provided. A belt loop set failure detecting device of a belt loop attaching sewing machine that determines that a belt loop set failure is generated when a signal indicating that a loop is present is not output from a sensor.