JPH0636580U - Sewing machine presser foot roller - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to sew straight without leaving a trace of the pressure of the presser foot roller on the sewing material. [Structure] A contact peripheral surface 2a that is inclined with respect to the rotating shaft at an angle β that is substantially equal to the inclination angle α of the rotating shaft is provided, and the entire circumference of the contact peripheral surface 2a extends from a position slightly away from the large diameter end to a small diameter end. A plurality of grooves 2b that gradually become deeper are formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cloth pressing roller which is provided on a feed dog of a sewing machine and presses a material to be sewn.

[0002]

[Prior art]

 The present applicant has already developed a presser foot device shown in FIG. 3 capable of forming a proper seam without disturbance even when sewing a velvet (Japanese Patent Application No. 4-59959). reference). The presser foot device is composed of a presser foot 5 and a rotatable presser roller 6 which is arranged on the side of the presser foot so that the height of the presser foot can be moved at least rearward of the needle drop position b. Suitable for presser foot device of needle feed sewing machine.

The presser roller used in this cloth pressing device is tilted about 20 ° with respect to the needle bar 3 in order to prevent interference with the needle bar 3 and to position the lower part on the feed dog 4. Has been. Therefore, assuming that the outer circumference 6a of the presser roller 6 is formed so as to make surface contact with the sewing material as shown in FIG. 4, the large-diameter side portion A and the small-diameter side portion B of the range in contact with the feed dog 4 are assumed. In and, a difference in circumferential speed occurs due to the difference in circumference, and a large amount of sewing material is fed in the large-diameter side portion A 1. If you try to sew it straight by hand, wrinkles will appear in the sewing material. In order to prevent such a phenomenon, in the above-described conventional cloth pressing device, as shown in FIG. 3, the ridge line portion 6b is devised so as to contact the sewing material.

[0004]

[Problems to be solved by the device]

 With the above-described cloth presser roller 6, when the cloth presser position a of the presser roller 6 is set to the rear of the needle drop position b, the velvet is overlapped so that the front side faces the back cloth, and sewing is performed by the needle feed sewing machine, The needle sticks into the sewing material before the presser foot 4 and the presser roller 6 which are raised above the needle plate surface so as to loosely contact the back surface of the velvet come into contact with the sewing material. In this state, the needle moves backward with the movement of the feed dog. The sewing material is moved backward to be fed to the back, the needle pulled out of the sewing material is swung forward, and the same operation is repeated to form a stitch. Therefore, since the stitches have already been formed mainly at the position of the sewing material pressed by the presser roller 6, the sewing material is not affected by the presser roller 6 and the velvet is not displaced with respect to the lining cloth. However, in the conventional method, the ridge line portion 6a of the presser foot roller 6 is not always in parallel contact with the upper surface of the feed tooth in the conventional method. Marks remain as shining lines on the sewing material, and there is a problem that the quality of the sewn product deteriorates.

An object of the present invention is to provide a cloth pressing roller that can be sewn straight without leaving a trace of pressing on the sewing material.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the cloth pressing roller of the sewing machine of the present invention has a contact peripheral surface that is inclined with respect to the rotary shaft at an angle substantially equal to the tilt angle of the rotary shaft, and has a large diameter side on the entire circumference. It has a plurality of grooves that gradually deepen from the position slightly away from the end to the end on the small diameter side.

[0007]

[Work]

 In the sewing machine with the cloth pressing roller configured as described above, when the velvet is overlapped and sewn with the front side facing the back cloth, the circumference of the contact surface between the large diameter portion side and the small diameter portion side is Due to the speed difference, more sewing material is fed toward the large diameter side. On the other hand, the sewing material is sandwiched between the feed dog and the contact surface, and escapes into each groove each time, and the amount of escape increases as it approaches the small diameter side end. The upper feed becomes larger at the smaller diameter side end, and as a result, the difference in the feed amount due to the peripheral speed difference is offset.

[0008]

【Example】

 The cloth pressing roller of the sewing machine of the present invention will be described with reference to FIGS. 1 and 2.

This cloth presser roller is used alone or in combination with a presser foot, and is made up of a metallic disc 1 having a hole for inserting a support shaft at the center and an outer periphery thereof. The outer peripheral portion 2 is made of oil-resistant polyurethane or the like, and the outer peripheral portion 2 is configured to come into surface contact with the sewing material.

As shown in FIG. 2, this cloth pressing roller is provided on the needle bar 3 in order to prevent interference with the needle bar 3 and to position the lower part on the feed dog 4 as in the conventional one. On the other hand, it is slightly tilted (the rotation axis is horizontal). The peripheral surface 2a of the outer peripheral portion 2 that comes into contact with the sewing material is inclined with respect to the axis of the cloth pressing roller at an angle β that is substantially equal to the inclination angle α of the cloth pressing roller.

Along the entire circumference of the contact peripheral surface 2a of the outer peripheral portion 2 having a width of about 3 mm, as shown in FIG. 1 (2), a plurality of grooves 2b which become gradually deeper toward the small diameter side end portion are arranged at equal intervals. Has been formed. This groove 2b uses a cushion of sewing material and allows the sewing material to escape (push) into the inside by the upward movement in the feed movement of the feed dog. As shown in FIG. It starts from a position a little distance L (about 1 mm) from the side end and extends to the small diameter side end. When the distance L is set to zero, the feeding balance, which will be described later, is lost, which is not preferable. The number of the grooves 2b is about 40 when the large-diameter side end portion has a diameter of 42 mm.

When the velvet is laid on the sewing machine with the cloth pressing roller having such a structure so that the front side faces the back cloth and sewing is performed, the large diameter portion side and the small diameter portion side of the contact peripheral surface 2a are Due to the difference in peripheral speed with the, the sewing material is fed more on the large diameter side. However, the sewing material is sandwiched between the feed dog 4 and the outer peripheral portion 2 and escapes into the grooves 2b each time, and the escape amount increases as it approaches the small diameter side end portion. Thus, the apparent feed of the sewing material becomes larger toward the end portion on the smaller diameter side, and as a result, the deviation of the feed amount due to the peripheral speed difference is offset.

The sewing material may be other than velvet.

[Effect of device]

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

That is, it is possible to sew without leaving a trace of pressing on the sewn material, which can contribute to the improvement of the quality of the sewn product. Moreover, even when sewing thick materials such as velvet, the sewing materials can always be sewn straight.

[Brief description of drawings]

FIG. 1 is a perspective view of a cloth pressing roller of a sewing machine of the present invention, (1) is an overall view, and (2) is a partial sectional view.

FIG. 2 is a front view of the cloth pressing roller of the sewing machine of the present invention.

FIG. 3 is a perspective view of a cloth pressing device including a conventional pressing roller.

FIG. 4 is a front view of a surface contact type presser roller.

[Explanation of symbols]

 1 disk 2 outer peripheral portion 2a contact peripheral surface 2b groove 3 needle bar 4 feed dog α inclination angle of presser roller β inclination angle of rotation axis

Claims (1)

[Scope of utility model registration request] 1. A contact peripheral surface that is inclined with respect to a rotating shaft at an angle substantially equal to the inclination angle of the rotating shaft, and extends from a position slightly apart from the large diameter side end to a small diameter side end on the entire circumference thereof. Sewing machine presser roller with multiple deepening grooves.