CS220263B1 - Device for signaling the consumption of the lower thread on the bobbin - Google Patents

Abstract

The essence of the invention is that the consumption of the lower thread is detected only when the formation of a few cm of the bound stitch has ceased. The worker must replace the empty bobbin with a full one and can continue sewing from the point where the formation of the bound stitch has ceased. This problem occurs most unfavorably when sewing on multi-needle machines, where the lower threads on the individual bobbins are not consumed simultaneously. When one of the lower threads is consumed, the sewing must be stopped, the remaining seams must be sewn to the level of the end of the seam at which the lower thread was consumed first, and after replacing the empty bobbins with full ones, the sewing process can continue.

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for signaling the consumption of a lower bobbin thread for use in sewing machines, in particular in ready-made production.

The sewing machines with bound siteh are used in the kionfection. The principle of forming the bound stitch is to thread the spool of thread through the loops of the upper thread. The maximum length of the lower thread wound on the spool is limited and contains several tens of meters, that is to say, the use of several tens of meters of lukewarm stitch consumes the entire length of the lower thread. The sewing machine operator is not informed about the consumption of the bottom thread while sewing. The complete consumption of the lower thread is only detected when the suture stitch is no longer formed. From complete consumption of the lower thread to the consummation of this fact, it takes some time to sew several centimeters of the bound seam without the slotted thread, the bound suture does not form and the worker has to replace the empty spool with full and continue sewing from the place where it was consumed. This disadvantage is most unfavorable in sewing on multi-purpose machines, where not all the bobbin threads are consumed at the same time. When one of the threads is consumed, the sewing must be terminated, after all the seams have been seamed to the level of the seam kionic, in which the lower thread was first consumed and the sewing process continued after replacing all the empty spools with full threads.

The prior art device for signaling the lowering of the bottom thread on a spool according to Swiss patent no. 505 243, wherein the coil diameter is followed by a swing arm that controls the electric switch. When the bottom thread is consumed, the diameter of the coil decreases and, at a certain minimum value, the swing arm switches on the electrical switch that controls the signaling device. The disadvantage of this device is the difficulty of changing the coil and the rapid wear of the functional parts. Podfa DOS no. 2,949,225 the diameter of the bobbin with the lower thread follows the light beam. From the light source, the beam passes through a pair of holes in the gripper, carrier and housing for the photoelectric sensor. The light beam can pass from the light source to the photioelectric sensor only when the coil diameter is reduced to a minimum value. The disadvantage of this device is a rough indication of the bobbin diameter before the bottom thread is completely consumed.

The disadvantages of the two devices are eliminated by the proposed device. It is based on the fact that in the hook, carrier and housing, the pairs of apertures are arranged at an angle formed by a light beam from the light source striking the glossy cylindrical surface of the coil and reflected by the light beam onto the photoelectric sensor coupled to an optical or audible signaling device.

An optical or audible signaliser alerts the operator that only a few threads of the base thread remain on the spool, which is sufficient for a few centimeters of sewn stitching and the empty spool needs to be replaced with a full spool.

In contrast to known lower thread slicing machines, the machine according to the invention has an indication of consumed lower thread before it is fully consumed, without increasing the difficulty of handling the bobbin replacement and unlimited lifetime

The advantage of the device according to the invention consists in reducing the time required for changing the bobbin, improving the working conditions of the sewing machine operator and increasing the productivity of the work and the quality of the products.

The device can be mounted on a conventional single or multi-sewing machine without limiting its original function with minor modifications to the bottom yarn catch mechanism. When using a trio device, each coil must have a separate light source, a photoelectric sensor, and an optical or acoustic signaling device. The invention can be used in the ready-made industry. It is advantageous to use an electro-sparking design of oltvoriums to provide the bottom yarn entrainment mechanism on finished sewing stitches.

An exemplary embodiment of a lower yarn consumption signaling device on a bobbin with the connection of a photoelectric sensor with an optical or acoustic signaling device according to the invention is shown in the drawing.

The device according to the invention has a light source 1 and a photoelectric sensor 13 located in the holes of the openings 3, 4, 5 and 6, 7, 8, on the hook 9, the carrier 10 and the sleeve 11 and outside the lowering mechanism. The photoelectric sensor 13 is connected electrically to the optical or acoustic signaling device 14, or to the drive of the shijac machine.

From the light source 1, the light beam 2 passes through the opening 3 of the gripper 9, the opening 4 of the gripper 10 and the opening 5 of the sleeve 11 onto the surface of the threads of the wound bottom thread. Before the bottom thread is completely consumed, the shiny cylindrical surface of the coil 12 starts to be visible between the threads of the bottom thread, the light beam 2 is reflected from it and passes through the opening 6 in the housing 11, the opening 7 in the carrier 10 and the opening 8 in the gripper 9. 13, which controls the optical or audible signaling device 14 or the drive of the shijac machine. When sewing, the hook 9 with the opening 3, 8 performs a rotating or rocking movement about the donkey coil 12, but at some point the openings 3, 8 are aligned with the openings 4, 5 and 6, 7 and the light beam 2 passes through them. The light flashes are captured by a photoelectric sensor 13.

220203

Claims (1)

SUBJECT A device for signaling the consumption of the lower thread on a bobbin embedded in a housing of a driving mechanism using a light source, a photoelectric sensor and an optical or audible signalall with a pair of holes in the hook, carrier and housing characterized in that the pair of holes (3,8, 4,7 and 4,7) 5,6) in the gripper (9), the carrier of the invention (10) and the sheath (11) are arranged at an angle formed by the light beam (2) from the light source (1) falling onto the glossy cylindrical surface of the coil (12) and by a beam (2) to a photoelectric sensor (13) coupled to an optical or audible signaling device (14) or to a machine breakdown.