KR920003253B1 - Sewing machine with fabric feeder machanism - Google Patents

Abstract

The improved feeding device performs easy and accurate feeding of a thick sheet, such as leather or canvas sheet, for sewing. In the machine, a side moving mechanism comprises a rotating shaft for performing intermittent periodic rotation and a lever member having a middle pivot shaft and one end of the lever being connected to the middle shaft with at least one connecting members whereas the other end connecting to the support bar of the press foot for the lever to make pivot movement on the middle pivot shaft.

Description

Sewing machine with fabric propulsion device

Figure 1 is a schematic perspective view of one side cover peeled off to show a sewing machine having a fabric propulsion apparatus according to the present invention.

Figure 2 is an internal side view showing the configuration of the fabric propulsion device of the sewing machine according to the present invention shown in FIG.

3 is an internal side view of the operating state for explaining the operation of the apparatus shown in FIG.

Figure 4 is a side view showing a fabric propulsion device of the conventional sewing machine.

* Explanation of symbols for main parts of the drawings

3: propulsion foot 4: support rod

5: first pivot 6: intermediate pivot

7: pivoting lever 8: crank arm

9: link

TECHNICAL FIELD The present invention relates to a sewing machine having a fabric propulsion device, and more particularly, to a sewing machine having an improved fabric propulsion device suitable for propulsion and sewing of a relatively thick and tough (eg leather or jeans) fabric.

In general, a sewing machine has a presser foot and its vertical movement mechanism that vertically presses and fixes the fabric in accordance with the vertical movement cycle of the needle, and also has a feed for moving the fabric horizontally by a predetermined distance when the needle finishes one cycle. Plate and left and right movement mechanism are installed. In addition to this, for example, in the sewing machine used to ensure the conveyance of the fabric or mainly for thick fabrics, the propulsion foot and its mechanism (operating apparatus) which operate in a reverse cycle of the presser foot and a period synchronized with the transfer plate at the upper portion of the fabric ) Is further provided.

A sewing machine having two feet which perform different functions on the fabric (eg, fabric fixing, and fabric propulsion) is, for example, published in Korean Patent Publication No. 1335 1727, US Pat. Nos. 4,116,145 and 3,196,815. The conventional distal propulsion device known by these prior arts is shown in FIG. 4 approximately, but conventionally, the left and right movements of the propulsion foot 3 'are moved to the first pivot shaft 5' where the upper end is pivotally rotated. Connected to the support rod 4 'of the propulsion foot 3' and relied on a long pivoting lever 7 'which rotates, the vertical movement of which is also intermittently rotated by a second pivot 10'. And a plurality of connecting members 11 ', 12', 13 ', 14' connected between the upper end of the support rod 4 '. Among them, the first pivot 5 ', which is the source of the left and right movement of the propulsion foot 3', needs to move relatively long because the pivot lever 7 'needs to be moved considerably, and on the contrary, the pivot lever 7 When a resistance is applied to the lower end of '), the power of the first rotating shaft 5' is easily blocked.

For this reason, for example, when sewing leather or thick fabrics, a problem may arise that the propulsion is not well performed. In addition, when the fabric is not well-propelled, the left and right movement periods and the vertical movement periods of the needles are not exactly matched. There is a problem that eventually breaks the needle.

Accordingly, in the present invention, by providing an improved fabric propulsion device in consideration of the above-described first rotational shaft and the physical momentum of the pivoting lever to impart the lateral movement of the propulsion foot, the propulsion of the fabric is smooth and the needle breaks under any circumstances. The purpose is to make sure that

A feature of the present invention to achieve the above object is, in the up and down movement mechanism and the up and down movement mechanism that provides the up and down movement as opposed to the exercise cycle of the presser foot having the up and down movement cycle so as to press the fabric at any one point In the sewing machine having a fabric propulsion device comprising a fabric prop for moving the predetermined up and down left and right sections by a left and right movement mechanism for providing a left and right movement for transporting the fabric in the lowered position, the left and right movement mechanism, A rotating shaft intermittently rotating at a predetermined cycle; It has an intermediate pivot shaft, one end is connected to the pivot shaft by at least one connecting member, and the other end is provided with a lever member coupled to the support rod of the propulsion foot to rotate about the center pivot shaft. .

In addition, the lever member is characterized in that the portion extending from the intermediate pivot shaft to one end thereof is longer than the portion from the intermediate pivot shaft to the other end shaft.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, reference numeral 1 denotes a body, 2 a presser foot, and 3 a propulsion foot. Although not shown, the presser foot 2 is a vertical movement of a predetermined period by its usual operation mechanism, and pressurizes and fixes the fabric not shown when descending. The propelling foot 3 penetrates through the lower end of the body 1 and at the lower end of the support bar 4 which is connected to the upper and lower motion devices and the left and right motion devices respectively installed in the upper part of the body 1 and the upper part. It is located on a serrated transfer plate (not shown) which moves left and right for the conveyance of the fabric.

First, the left and right exercise machines include a first rotating shaft 5, a rotating lever 7 having an intermediate rotating shaft 6, and a crank arm 8 and a link 9, which are connecting members. As described above, the first rotational shaft 5 generates power for intermittent rotation at a predetermined period, from which one of the crank arm 8, the link 9, and the rotation lever 7 (upward in the drawing). ) The ends 7a are sequentially connected so that the pivot lever 7 pivots about its intermediate pivot 6. The other end (downward in the figure) of the pivoting lever 7 is passed through the support rod 4 of the propulsion foot 3 so as to be movable up and down and moves up and down by the vertical movement mechanism described later. It operates in the left-right direction in accordance with the operation of the rotation lever 7 (see FIG. 3).

It is particularly important here that the pivot lever 7 has an intermediate pivot 6, which has a distance L1 between the pivot 6 and one end 7a and the opposite pivot 6. The relationship with the distance L2 between the other edge parts 7b is L1> L2.

Therefore, the rotation moment of one end portion 7a is larger than the rotation moment of the other end portion 7b, so that the first rotation shaft 5 can be driven even with a relatively weak driving force. Even if a heavy load is applied, the driving force cannot be prevented and the operation is continued.

On the other hand, as the vertical movement mechanism for the vertical movement of the propulsion foot (3), for example, the second rotation shaft 10 and the plurality of connecting members (11) (12) (13) (14) ), And the operation will be the same as usual, so the detailed description thereof is omitted here for convenience.

However, it is necessary to manage the mutual periods so that the starting point of the vertical movement of the propulsion foot 3 coincides with the end point of the left and right movement by the left and right movement mechanism. It is also possible, if necessary, to allow their mutual movements to be carried out together to the extent permitted.

The present invention is not limited to what has been illustrated and described above, and of course, many more modifications than the above embodiments are possible within the same technical scope.

As described above, according to the present invention, even when sewing the fabric is not propelled compared to the thick and the other smoothly up and down and front and rear motion without stopping the propelled foot, as well as the propelling of the fabric, as well as needle There is no breakdown or machine stoppage, and it is possible to use relatively weak power, so that the power device can be simplified and inexpensive.

Claims (2)

In contrast to the movement cycle of the presser foot having the up-and-down movement cycle so that the fabric can be pressed and fixed at any one point, the up-and-down movement mechanism for providing the up-and-down movement and the left-right movement for transferring the fabric in the down position by the up-down movement mechanism In the sewing machine having a far-end propulsion device comprising a far-end propulsion foot to move a predetermined up, down, left and right sections by a left and right movement mechanism to provide a, the left and right movement mechanism, intermittent rotation in a predetermined cycle, intermediate rotation shaft One end is connected to the pivot shaft with at least one connecting member, and the other end is coupled to the support rod of the propelling foot and comprises a lever member for rotating around the intermediate pivot shaft Sewing machine with propulsion unit. The distal propelling apparatus according to claim 1, wherein the lever member has a portion extending from the intermediate rotation shaft to one end thereof longer than the portion extending from the intermediate rotation shaft to the other end thereof. Sewing machine.

Images