JPS6219342Y2 - - Google Patents

Description

[Detailed description of the invention] This invention drives the sewing machine while forming a predetermined number of stitches in relation to a start signal or while detecting the fabric at the seam portion, and completes the formation of a predetermined number of stitches. The present invention relates to a control device for an automatic sewing machine that stops the sewing machine when the sewing machine is detected to be running or passing through cloth, and particularly relates to controlling a sewing machine for forming a corner stitch or a stitch along a curved line.

Conventionally, the sewing machine automatically forms a predetermined number of stitches on a certain length of cloth and then stops the sewing machine, or detects the fabric and forms stitches on the fabric until the fabric passes through, and then stops the sewing machine. Automatic sewing machines with automatic sewing machines are well known; however, in the former automatic sewing machine, it is necessary to set a sequence in advance to stop or decelerate the sewing machine to prevent stitches from coming off at the corners of the fabric.
The circuit configuration becomes complicated and there are drawbacks such as difficulty in finely controlling the speed to suit the sewing shape and work efficiency.In addition, in the latter type of automatic sewing machine, the sewing machine cannot stop until it detects the end of the cloth, so The seams reached the edges of the fabric at the corners, creating an unsightly appearance and deteriorating the quality of the product.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional sewing machine and to provide a highly efficient sewing machine.

An embodiment of this invention will be explained with reference to the drawings. A sewing machine 2 placed on a table 1 is a normal sewing machine. On the bed in front of the presser foot 3 in the cloth feeding direction, there are upper and lower plates forming a cloth passage. A cloth guide means having a guide surface for guiding one side edge of the cloth along the cloth feeding direction is fixedly arranged, and the cloth guide means 4 applies a rotational moment to the cloth inserted between the upper and lower plates to move the cloth to the guide surface. This is a well-known method that presses one edge of the On the cloth moving path between the cloth guide means 4 and the presser foot 3, cloth detecting means 5, which is a photoelectric element or the like, is arranged to detect the presence or absence of cloth and generate a cloth detection signal. Below the table 1, a well-known electromagnetic clutch motor 8 connected via a belt 7 to a pulley 6 fixed to the rear end of the main shaft (not shown) of the sewing machine 1 is fixed. A control box 9 for controlling each operating section is fixed, and on the front side there is a stitch count setting means 10 such as a digital switch for setting the stitch count, or a selection means 21 for selecting either stitch count setting control or fabric detection control. It has been placed.

Further, a speed control means as shown in FIG. 2 is arranged below the table 1. The rotary solenoid 11 fixed to the table 1 has its own drive shaft 1.
2 is rotatably supported between an inactive position when deenergized and an energized position separated clockwise (FIG. 2) from the inactive position. The movable lever 13 whose base end is fixed to the drive shaft 12 has a tip protruding in the radial direction, and between the tip and the machine frame there is a position where the movable lever 13 moves, that is, between the action and non-action positions of the drive shaft 12. A movement detection means LS (FIG. 3) is arranged in relation to the movement detection means LS (FIG. 3) which detects the movement position in a stepless or stepwise manner and generates a detection signal. The middle part is the drive shaft 1 of the solenoid 11.
A connecting lever 15 is rotatably supported around a support shaft 14 parallel to the moving lever 13, and has one end facing the lower end of the movable lever 13 so as to be engageable, and the other end facing the wire 1.
6 is fixed at its upper end, and is always subjected to an acting force in the counterclockwise direction (FIG. 2) by a coiled spring 17. The lower end of the wire 16 is connected to a pedal 18 placed on the floor, and when the pedal 18 is released, the connecting lever 15
is pulled by a coiled spring 17 and has one end located below the moving lever 13 corresponding to the operating position,
When the pedal 18 is pushed down to the lowest position where the other end of the connecting lever 15 engages with the locking body 19 fixed to the machine frame, one end of the connecting lever 15 moves the moving lever 13 to a position just before the inactive position. An operation detecting means MS (FIG. 3) is connected to the pedal 1 so as to push it up to a stop position for stopping the motor 8 of the pedal 1, and generates an action signal at its lowest position.
It is located inside 8.

The sewing machine 1 includes a presser foot lifting means (not shown) that lifts the presser bar 20 supporting the presser foot 3 so as to separate the presser foot 3 above the throat plate by electrical bias, a sewing machine frame, and a pulley. needle position detection means PS (Fig. 3) which detects the rotation angle corresponding to the needle upper or lower position of the main shaft of the sewing machine and generates a position signal; and the drive shaft 12 (moving lever 1).
A thread cutting means (not shown) is disposed which acts in connection with the return of the needle 3) from the working position to the non-working position and cuts the upper and lower threads below the throat plate.

Regarding the electric circuit shown in FIG. 3, the detection signals from both the operation detection means MS and the cloth detection means 5 are input to the presser foot control circuit FD that controls the presser foot lifting means, and the detection signals are related to the generation of the cloth presence signal from the cloth detection means 5. presser bar 20
The presser bar 20 is controlled to be lowered and to be raised in response to generation of a no-cloth signal from the cloth detection means 5 or an action signal from the operation detection means MS.

CT is a counting circuit which counts the needle down position signal from the needle position detection means PS and generates a coincidence signal when the counted value becomes equal to the set value of the number of stitches setting means 10. MD is a solenoid control circuit, and when controlling the number of stitches by selecting the selection means 21,
The rotary solenoid 11 is energized in response to a start signal from the start operation means SS (Fig. 3) and deenergized in response to a coincidence signal from the counting circuit CT. The rotary solenoid 11 is controlled to be energized in relation to the signal and deenergized in relation to the no-cloth signal. SD is a speed control circuit that inputs the detection signal from the movement detection means LS, and sets the electromagnetic clutch motor 8 to a stop state in response to a detection signal (stop signal) corresponding to the stop position of the moving lever 13, and moves the moving lever 13 to the stop position. The speed of the motor 8 is controlled so that the speed increases in proportion to the moving distance from the non-active position in relation to the detection signal (speed signal) corresponding to the active position.

Although not shown, the thread cutting means is activated in response to the rise of the detection signal corresponding to the inactive position of the drive shaft 12.

This invention has the above-mentioned configuration, and when the selection means 21 is set to stitch number setting control or cloth detection control, in the former case, the starting operation means S,
In the latter case, the solenoid control circuit MD energizes the rotary solenoid 11 in response to the activation signal of S, and in the latter case, the cloth presence signal of the cloth detection means 5, and the drive shaft 12 rotates from the inactive position to the active position, and movement is detected. means
A speed signal corresponding to the operating position is generated from the LS, and the motor 8 is driven at the maximum speed.

As the sewing machine continues to sew and the pedal 18 is depressed before the corner of the fabric, the connecting lever 15 moves clockwise (second
), the connecting lever 15 pushes the tip of the moving lever 13 back toward the inactive position against the urging force of the rotary solenoid 11, and accordingly, the motor 8 is decelerated by the speed signal from the movement detecting means LS. be done. Then, press the pedal 1 at the corner of the seam.
8 until the locking body 19 and the connecting lever 15 are engaged, the drive shaft 12 comes to the stop position, the movement detection means LS generates a stop signal, and the motor 8
stops, and the operation detection means for the pedal 18
An action signal is generated from the MS, the presser foot lifting means FD is activated, and the presser foot bar 20 lifts the presser foot 3 onto the throat plate.

When the pedal 18 is released after turning the cloth by a predetermined angle in accordance with the sewing angle, the action signal is turned off, the presser foot lifting means FD becomes inactive, the presser foot 3 is lowered onto the throat plate, and the connecting lever 15 is The coil spring 17 rotates the drive shaft 12 counterclockwise (FIG. 2), and the drive shaft 12 is moved again to the operating position by the urging force of the solenoid 11, and the motor 8 is driven again at the maximum speed.

When forming a seam along the bending line, the speed of the motor 8 can be adjusted as desired by adjusting the degree of depression of the pedal 18 and setting the rotating position of the drive shaft 12 between the stop position and the working position. It is possible to form a seam by changing the At the end of sewing, the solenoid control circuit MD deenergizes the solenoid 11 in relation to the coincidence signal of the counting circuit CT in the stitch number setting control and in relation to the no cloth signal in the cloth detection control.

As a result, the drive shaft 12 returns to the inactive position after generating a stop signal, and after the motor 8 is stopped, the thread cutting means is activated.

In this embodiment, the stitch number setting control is performed by counting the number of stitches, but other means such as a timer may be used.

Further, although the pedal 18 is used as the operating means in this embodiment, other operating means operated by the knee or hand may be used.

As described above, according to this invention, the motor 8 is connected to the main shaft of the sewing machine and is stopped or driven by an electrical signal, and the movable body 13 is movable between the first position and a second position distant from the motor 8.
and an electromagnetic means 1 connected to the movable body and moved to a first position when energized and a second position when deenergized.
1, a detection means LS disposed in relation to the moving body and generating a speed signal at a first position and a stop signal at a second position; a motor control circuit SD stopping the motor in relation to the generation of the speed signal; a starting operation means SS that generates a starting signal by manual operation;
A drive control circuit that energizes the electromagnetic means in relation to the activation signal and deenergizes the electromagnetic means in relation to completion of stitch formation of a predetermined length.
MD, an operating means 15-18 connected to the movable body, capable of being moved to a release position corresponding to a first position of the movable body, and an operation position corresponding to a second position, and always receiving an elastic force toward the release position. This allows a simple device to be attached to the sewing machine table as an attachment, which simplifies the sequence for machines that automatically stop the sewing machine by setting the number of stitches, and for machines that stop the sewing machine by detecting the edge of the fabric. To obtain effects such as improving the quality of products by finishing the stitches neatly without coming off from the cloth, and to obtain an inexpensive device without the need to extensively replace electric circuits, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the automatic sewing machine of this embodiment.
FIG. 2 is a perspective view of the speed control means, and FIG. 3 is an electric circuit. In the figure, 8 is an electromagnetic clutch motor, 13 is a moving lever that constitutes a moving means, LS is a movement detection means that is a moving means, SD is a motor control circuit, 11 is a rotary solenoid that is an electromagnetic means, and MD is a drive control. A solenoid control circuit constitutes the circuit, a connecting lever 15 constitutes the operating means, a coil spring 17 constitutes the operating means, and a pedal 18 constitutes the operating means.

Claims (1)

[Claims for Utility Model Registration] A motor 8 connected to the main shaft of the sewing machine and stopped or driven by an electrical signal, a movable body 13 movable between a first position and a second position distant from the first position, and a movable body Electromagnetic means 11 that is connected and moved to a first position when energized and a second position when deenergized.
a detection means LS disposed in relation to the moving body and generating a speed signal at a first position and a stop signal at a second position; and a detection means LS for driving a motor at a predetermined speed in relation to the generation of the speed signal to generate a stop signal. A motor control circuit SD that stops the motor in connection with the start operation, a start operation means SS that generates a start signal by manual operation, and an electromagnetic means that energizes the electromagnetic means in relation to the start signal to complete the formation of a predetermined length of seam. drive control circuit that deenergizes
MD, operating means 15-18 connected to the movable body, operable to move between a release position corresponding to the first position of the movable body and an operation position corresponding to the second position, and always receiving an elastic force toward the release position; A control device for an automatic sewing machine, comprising: a control device for an automatic sewing machine, which moves a movable body from a second position to a first position in relation to operation of an operating means.