JP2000051558A - Cloth presser bar for sewing machine utilizing action of fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cloth presser bar for the purpose of being synchronized with the high-speed rotation of a sewing machine and maintaining fixed pressurizing force at all times corresponding to the change of a pressing pressure. SOLUTION: This cloth presser bar 2 is provided with the pressing pressure by a shock absorber 1 whose medium is fluid for a cloth pressing pressure by a conventional spring pressure. In order to improve the accuracy of the pressing pressure further, by combining a compressor 4 and a regulator 3 and supplying fixed stable compressed fluid to the shock absorber 1 at all times, since synchronization with the rotation number of the sewing machine is performed under any conditions by the cloth presser bar 2, idle feed by jumping and the generation of cloth damages by feed teeth 7 are prevented as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of developing a fabric presser rod which can hold a fabric in a stable state in synchronization with high-speed rotation of a sewing machine.

[0002]

2. Description of the Related Art Since the pressing of a fabric presser bar is performed by a spring, if the natural frequency of the spring exceeds the number of revolutions of the sewing machine, it becomes impossible to synchronize with the vertical movement of the fabric feed dog (7), and the fabric is fed in an empty state. Jumping occurs, the rotation speed of the sewing machine must be reduced, and the fabric is easily damaged by the fabric feed dog.

[0003]

In order to prevent jumping from occurring, the ability to reliably tune to all rotation speeds and a constant pressing force even when there is a difference between the vertical position of the cloth feed dog and the change in the thickness of the cloth. The challenge is to develop a fabric presser rod that also has the ability to prevent the occurrence of fabric scratches due to the fabric feed dog by maintaining it.

[0004]

[Means for Solving the Problems] In order not to cause jumping, there is a fluid repulsive force and pressing force that can be tuned to all rotational speeds because there is no natural frequency for pressing by a spring that cannot cope with conventional high-speed rotation. Use a fabric presser bar using a shock absorber. 2. In order to prevent the fabric feed dog from causing a fabric flaw, the interlocking of the shock absorber and the regulator enables a constant supply of compressed fluid under all conditions.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A compressed fluid from a compressor (4) is supplied to a shock absorber (1) integrated with a fabric presser bar (2) through a regulator (3) for regulating pressure.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The compressed fluid sent from the compressor (4) is supplied through a regulator (3) to a shock absorber (1) integrated with a fabric presser bar (2). 2. As the first simple method, the closed type shock absorber and the fabric presser bar are integrated.

[0007]

Advantages of the Invention Since no jumping occurs, a. The stitch pitch is set. B. No puckering occurs. 2. Since the pressing is always constant, no fabric flaw is caused by the fabric feed dog. 3. Since the pressing is synchronized with the high-speed rotation, high efficiency can be achieved. 4. One compressor can supply compressed fluid to more than ten sewing machines.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment in which a shock absorber is incorporated in a fabric presser bar of a sewing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shock absorber 2 Fabric presser bar 3 Regulator 4 Compressor 5 Fabric presser 6 Fabric 7 Fabric feed dog 8 Needle bar

Claims (1)

[Claims] 1. A fabric presser bar of a sewing machine, wherein a press action of a fabric presser bar, which is a component of the sewing machine, is performed by a shock absorber using a fluid as a medium.