JPH0860Y2 - Leading roller device for sewing machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leading roller device which is most suitable for a jeans waist belt sewing machine.

[0002]

2. Description of the Related Art As a device for keeping a sewing pitch constant by a sewing machine, a device for forcibly pulling a sewn product immediately after sewing backward by a positively driven leading roller is well known. Then, it has already been performed to sew the waist end of the jeans body sandwiched between the waist belts folded in the length direction in the length direction of the waist belt with the jeans waist belt sewing machine equipped with the pulling roller device. . In sewing the waist belt, the leading roller is raised from the cloth surface every time the waist belt is cut.

[0003]

In a sewing machine equipped with a leading roller device, the needle pitch is determined by the pulling force of the leading roller and the feeding force of the cloth feed dog of the sewing machine. However, when setting the cloth on the sewing machine or when starting the next sewing from the rising state of the leading roller when cutting the waist belt when sewing the waist belt, when the leading roller is moved down to approach the cloth, Is pressed to the presser side, and the cloth between the presser foot is loosened. In addition, due to the loose drive belt of the leading roller,
There is a problem that the needle pitch becomes finer than in the normal state until the looseness and backlash at the start of sewing are absorbed.

An object of the present invention is to provide a leading roller device capable of aligning a regular needle pitch from the first stitch when sewing is started by a sewing machine.

[0005]

In order to achieve the above-mentioned object, the leading roller device in the sewing machine of the present invention uses a motor for maintaining the energized state for a predetermined short time after descending the leading roller as a cloth feeding device. They are connected to each other so as to remove the looseness of the sewing cloth between the leading roller and the presser foot.

[0008]

[Operation] In the leading roller device of the sewing machine configured as described above, when the leading roller is lowered onto the sewing cloth at the start of sewing, the motor connected to the cloth feeding device is operated for a predetermined time. Electricity is supplied, and during that time, the cloth feeding device is operated to absorb the looseness of the cloth between the leading roller and the presser, and the backlash of the power transmission system of the leading roller is also removed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a leading roller device in a sewing machine of the present invention will be described with reference to FIGS.

The leading roller 1 is disposed behind the head of the sewing machine in an inclined state toward the presser foot 2 and its driving means includes the endless driving belt 3 and any known driving means. It may be one. Further, the pulling roller 1 employs a mechanism that can be moved in the vertical direction by a spring or the like so that it can escape upward when a thick portion of the cloth such as a folded joint is approaching.

The drive source of the leading roller 1 is the upper shaft 4 of the sewing machine.
Thus, the leading roller 1 is given intermittent rotation in synchronization with the sewing through the transmission 5 and the one-way clutch 6.

According to the present invention, particularly, on the input side of the one-way clutch 6, by lowering the leading roller 1,
The motor 7 which is energized for a short fixed time of 2 seconds is connected.
The motor 7 operates by receiving a signal from an appropriate sensor that detects the lowering of the leading roller 1.
A timer 8 for energizing the motor 7 is connected so that the time for energizing the motor 7 can be appropriately set in consideration of the inertia of the motor and its drive system.

In the leading roller device of the sewing machine having such a structure, when sewing, the leading roller 1 is intermittently driven by the power transmitted from the upper shaft 4 of the sewing machine through the transmission 5 and the one-way clutch 6. Driven,
When lowering the leading roller 1 onto the cloth at the start of sewing, the motor 7 is moved simultaneously with the lowering of the leading roller 1.
Rotates for a short period of time, and the rotation is transmitted to the leading roller 1 via the one-way clutch 6. The short rotation of the leading roller 1 before the start of sewing removes looseness of the sewing cloth and rattling of the power transmission system of the leading roller 1.
Then, sewing is started by the normal operation of the sewing machine.

The slack of the sewing cloth between the leading roller 1 and the presser foot 2 has been described above by removing the slack by rotating the leading roller 1, but in addition to this, in the sewing machine having the needle feeding function. The motor 7 which is energized for a short period of time by the lowering of the leading roller 1 may be connected to the needle feeding mechanism, and the sewing cloth between the leading roller 1 and the leading roller 1 may be fed backward to loosen the sewing cloth. .

[0015]

Since the present invention is constructed as described above, it has the following effects.

That is, it is possible to sew with the regular needle pitch aligned from the first stitch at the start of sewing.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a leading roller device in a sewing machine of the present invention.

FIG. 2 is a side view of a sewing machine provided with a leading roller.

[Explanation of symbols]

 1 Leading roller 3 Drive belt 4 Upper shaft of sewing machine 5 Transmission 6 One-way clutch 7 Motor 8 Timer

Claims (1)

[Scope of utility model registration request] 1. A sewing machine for removing looseness of a sewing cloth between a leading roller and a presser by connecting a motor for maintaining a current-carrying state for a predetermined short time after lowering the leading roller to a cloth feeding device. Roller device in.