JPH0523452A - Thread transferring-out/cutting device of hand stitch sewing machine - Google Patents

Abstract

PURPOSE:To automatize the device by calculating the thread feed quantity, based on sewing data inputted in advance and transferring out by controlling the transfer-out quantity of a thread transfer-out mechanism, cutting a thread by operating a cutting mechanism, and also, preparing the next cycle in the course of sewing. CONSTITUTION:When sewing data is inputted from an operating panel, an arithmetic means calculates the feed quantity of a thread, and also, calculates the driving pulse quantity of a pulse motor PM. Based thereon, a control signal is outputted to a motor driver PM1 from a control means 14a and the pulse motor PM is rotated. In such a ways a thread 2a is inserted and held by rollers 7, 8 and hangs down from a second thread guide 12. Subsequently, when a prescribed quantity is fed out, the motor PM stops and it is also stopped to feed out the thread. In such a state, an air cylinder AS operates and the thread 2a is cut with a dynamic knife 10. Sewing is executed with this thread 2a, and also, the next thread is prepared by the same procedure in the course of this sewing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand stitch sewing machine in which needles are alternately transferred between two needle bars arranged above and below a sewing machine table to form a hand-sewn stitch. The present invention relates to a yarn feeding and cutting device for feeding and cutting a general yarn wound in a roll shape for a predetermined length according to a sewing operation.

[0002]

2. Description of the Related Art Conventionally, a needle is passed between two needle bars (an upper needle bar and a lower needle bar) arranged at a lower position on a sewing machine table and a finite length passed through a needle hole. A sewing machine is known in which a hand-sewn-like seam S shown in FIG. 6 is formed on a cloth conveyed by each needle by one thread. Such a so-called hand stitch sewing machine is mainly used to form a hand-sewn stitch around the collar and around the outer pocket to obtain a design accent. There are two types of sewing, one is using a special thread that is cut in advance to a certain length according to the sewing content, and the other is using a general thread wound in a roll shape.

[0003]

However, in the above case, in the case of the hand-stitch sewing machine that uses the general thread wound in a roll shape, the thread is pulled out from the roll for each sewing cycle and the thread is made to have a length according to the sewing content. It must be cut and it is inefficient. At present, the dedicated thread is not wound in a roll shape, but a circular thread is cut at one place for use, and the overall sewing efficiency is almost the same as the former. The present invention has been made in view of the above-mentioned problems, and provides a thread feeding and cutting device that automatically feeds and cuts a regular thread and a special thread in a roll shape for a predetermined length to provide a sewing operation. The purpose is to

[0004]

SUMMARY OF THE INVENTION According to the present invention, a sewing needle having a finite length of thread is passed between an upper needle bar and a lower needle bar disposed above and below a sewing machine table. A hand-stitch sewing machine that is designed to form a hand-sewn-like seam is provided with a thread feeding and cutting device for automatically feeding and cutting a sewing thread for a predetermined length for use in sewing operation. A thread cutting mechanism for cutting the thread fed out for a predetermined length, a thread guide and a first thread guide arranged between the thread supply source and the thread delivering mechanism, the thread delivering mechanism and the thread. A second thread guide arranged between the cutting mechanism and
Comprising computing means for computing the thread feed amount based on the sewing data, and control means for controlling the operation of the drive sources of the thread feeding mechanism and thread cutting mechanism by the output of the computing means,
The yarn feeding mechanism includes a main roller, a pulse motor that is a rotation driving source of the main roller, and a sub roller that holds the yarn between the main roller and the sub roller that is driven to rotate by the main roller. An object of the present invention is to solve the conventional problems described above by using a knife, a moving knife that reciprocates and cuts a thread between the fixed knife, and a cylinder that is an operation drive source of the moving knife. ..

[0005]

In the present invention, the sewing data is input to the control means in advance, and the output of the calculating means for calculating the thread feed amount based on the data is used to output the output of the calculating means to the thread feeding mechanism for a predetermined length. As the yarn is unwound from the bobbin, the cutting mechanism operates to cut the yarn into a predetermined length. Then, while sewing with this thread, the thread required for the next cycle is fed and cut into a predetermined length to be prepared.

[0006]

Embodiments of the present invention will be described with reference to the drawings. 1 to 5 are views showing an embodiment of the present invention. FIG. 1 is a perspective view of a stitch sewing machine according to an embodiment of the present invention. In the figure, 1 is a thread stand equipped with a thread winding 2 in which a plain thread 2a is wound in a roll shape, 4 is an operation panel provided on the front surface of a sewing machine arm, and inside thereof, a thread feeding mechanism DM, a thread cutting mechanism CM, etc., which will be described later. Is stored.
3a and 3b are thread guides provided on the sewing machine arm between the spool 2 and the operation panel 4, respectively, 5 is a threader, and 6 is an upper needle bar arranged on the upper surface of the sewing machine table T, which is arranged on the lower surface. The needle N is delivered to and from the lower needle bar (not shown) to form the hand-sewn-like seam S shown in FIG. 9, 1
Reference numerals 0 are a fixed knife and a moving knife, respectively, which will be described later. 2 and 3 are a front view and a side view, respectively, showing the related configurations of the yarn feeding mechanism and the yarn cutting mechanism. In the figure, 7 is a main roller that rotates counterclockwise using a pulse motor PM as a drive source, and 8 is a sub roller that holds the thread 2a between the main roller 7 and is driven by the main roller 7 and rotates clockwise. The main roller 7, the sub roller 8, and the pulse motor PM constitute a yarn feeding mechanism DM, which is attached to brackets A and B as support members.

Reference numeral 9 is a fixed knife, 10 is a moving knife that reciprocates with respect to the fixed knife 9 and cuts the thread 2a, and AS is an air cylinder as a drive source of the moving knife 10. 10. The yarn cutting mechanism CM is constituted by the air cylinder AS, and the brackets A and B as support bodies
Is attached to. Reference numeral 11 is a first yarn guide provided between the yarn guide 3b and the yarn feeding mechanism DM to guide the yarn 2a between the main roller 7 and the sub roller 8 which are in sliding contact with each other, and 12 is the yarn feeding mechanism DM and the yarn cutting mechanism. Mechanism C
The thread 2a is provided between the fixed knife 9 and the moving knife 10
It is a 2nd thread guide which guides to a cutting position by.

FIG. 4 is a block diagram mainly showing the control system of the pulse motor PM and the air cylinder AS, and 13 is a microcomputer comprising a CPU 14 including a control means 14a as a central processing unit and an arithmetic means 14b, a RAM 15 and a ROM 16. is there. Then, a calculation unit 14b and a control unit 14a for calculating the thread feed amount based on the sewing data input from the operation panel 4 are configured. AS1 is a driver for the air cylinder AS including a solenoid valve and PM1 is a driver for the pulse motor PM.

The operation of this embodiment having the above construction will be described with reference to FIG. When the switch is turned on, first, the sewing data is input from the operation panel 4 (step 1), and if the thread is set in a predetermined manner, the thread feed amount is calculated (step 2). It is calculated (step 3). As a result, the microcomputer 13
A control signal is output from the control means 14a to the motor driver PM1 to output a predetermined number of pulses to the pulse motor PM, and the pulse motor PM starts rotating by an amount corresponding to the number of pulses (step 4). When the pulse motor PM starts rotating, the main roller 7 rotates together with the sub roller 8,
Along with this, the yarn 2a sandwiched between the circumferential ends of both is fed toward the second yarn guide 12, and the yarn end portion hangs down from the second yarn guide 12.

When a predetermined number of pulses are output and the required amount of yarn is delivered from the second yarn guide 12, the pulse output is stopped, whereby the pulse motor PM is stopped and the yarn delivery is also stopped (step). 5). In this way, a thread of a predetermined length necessary for sewing is sent out through the second thread guide, and when the operation of the thread payout mechanism DM ends, a control signal is output from the control means 14a and the air cylinder AS operates to attach the moving knife 10. It reciprocates against the biasing spring 10a and cuts the thread 2a between both knife (steps 6 and 7).

In this way, a thread of the length necessary for sewing is automatically obtained from the bobbin and this thread is passed by the threader 5 to the needle N.
The needle is attached to the needle hole and the predetermined sewing operation is performed. Then, while the sewing operation is being performed, the next thread feeding and thread cutting are performed according to the sewing data input to the operation panel to prepare for the next operation.

[0012]

As described above, the present invention provides a yarn feeding and cutting device for a hand-stitch sewing machine, a yarn feeding mechanism, a yarn cutting mechanism for cutting the yarn fed a predetermined length therefrom, and a yarn supply source. A thread guide and a first thread guide provided between the thread delivery mechanism and a second thread guide provided between the thread delivery mechanism and the thread cutting mechanism, and a sewing data base. And a control means for controlling the operation of the drive source of the yarn feeding mechanism and the yarn cutting mechanism by the output of the computing means. , A pulse motor which is a rotation driving source of this, and a sub roller which holds a thread between the main roller and a main roller and is rotated by a gear driven by the main roller. The cutting device reciprocates with a fixed knife. Fixed Since it is composed of a moving knife that cuts the thread between and, and a cylinder that is the driving source of this moving knife, it automatically feeds the thread from the roll-shaped spool according to the sewing content and cuts it to the required length. Since it can be used for the sewing operation, the sewing efficiency is significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a stitch sewing machine according to an embodiment of the present invention.

FIG. 2 is a front view of the essential parts of the yarn feeding and cutting device according to the first embodiment of the present invention.

FIG. 3 is a side view of the same.

FIG. 4 is a block diagram showing a control system of the device according to the present invention.

FIG. 5 is a flowchart showing the operation of the apparatus according to the present invention.

FIG. 6 is a sewing state diagram of a hand-sewn style seam.

[Explanation of symbols]

 4 operation panel 7 main roller 8 sub roller} DM thread feed mechanism PM pulse motor 9 fixed knife 10 moving knife} CM thread cutting mechanism AS air cylinder 13 microcomputer 14b computing means (feed amount calculating section) 14a control means

Claims (1)

Claim: What is claimed is: 1. Hand stitching by passing a sewing needle through which a finite length of thread is inserted between an upper needle bar and a lower needle bar disposed above and below the sewing machine table. In a hand-stitch sewing machine configured to form a seam of the wind, the thread-feeding cutting device automatically feeds and cuts a sewing thread for a predetermined length to use for sewing operation. A thread cutting mechanism that cuts the thread that has been fed for a predetermined length, a first thread guide that is arranged between the thread supply source and the thread feeding mechanism, and the thread feeding mechanism and the thread cutting mechanism. A second thread guide disposed between the two, a means for calculating a thread feed amount based on the sewing data, and a drive source for the thread feeding mechanism and the thread cutting mechanism by the output of the calculating means. Motion control The yarn feeding device includes a main roller, a rotation driving source for the main roller, and a sub roller that holds the yarn between the main roller and the sub roller that is driven to rotate by the main roller. , A fixed knife, a moving knife that reciprocates and cuts the thread between the fixed knife, and a motion drive source of the moving knife, and a yarn feeding and cutting device for a hand stitch sewing machine.