JPH0824454A - Cloth presser for sewing machine - Google Patents

Abstract

PURPOSE:To provide a cloth presser in which the turning operation of a cloth is facilitated when hemstitching is performed by a sewing machine. CONSTITUTION:The cloth presser part 3 has a needle locating part 5 recessed from the right side edge and a protruding part 6 protruded downward on the cloth feed side opening part of the recessed part. The lower end surface of the protruding part 6 is situated under the surface of a throat plate 7. The throat plate 7 is screwed to the upper surface part of a bed machine frame, a recessed part 8 for needle location recessed to the left from the right side edge is formed on the throat plate 7, and a hemstitching projection 9 is provided toward the recessed part 8. The throat plate 7 has a plurality of feeding windows 10 long in the cloth feeding direction, a tooth 11 is opposed to the windows 10 from under in such a manner as to be vertically movable, and four-feed motion is performed to feed a cloth W from this side to the rear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth presser for a sewing machine with a cutting knife, which cuts a cloth end and sews the cloth end.

[0002]

2. Description of the Related Art In a conventional cloth pressing portion A of a sewing machine with a cutting knife, a cloth pressing portion A has a contact length in the feeding direction with a feed dog, which is 2 in FIG.
As the position of the front end is indicated by the dotted line, it is very large, and the swirling property of the cloth is low, and it is not suitable for the operation of sewing beads to a curved cloth end, for example.

[0003]

SUMMARY OF THE INVENTION According to the present invention, a cutting knife is a sewing machine, which has poor operability and is difficult to work with in the past. Is intended to be developed.

[0004]

According to the present invention, in a sewing machine with a cutting knife, the front end position of the presser foot of the presser foot is set to be greater than the front end position of the feed dog when the feed dog projects above the surface of the needle plate. Also on the rear side, and by providing a downward projection near the right side of the cloth retainer with the lower end surface below the surface of the needle plate, the pressing force on the cloth is reduced and the right side of the cloth is rotated when the cloth is swung. The edge dependence point is given to ensure the improvement of turning performance.

[0005]

According to the present invention, the cloth retainer mounted on the lower end of the presser bar supported by the arm machine frame of the sewing machine, the plurality of windows mounted on the bed machine frame and long in the cloth feeding direction, and the cloth feeding direction A needle plate formed with a needle drop recess that is recessed leftward from the parallel right side edge, and teeth formed on the upper surface that are mounted on the bed machine frame below the needle plate and are capable of four feed movements. In a sewing machine provided with a feed dog whose portion periodically faces upward from the window of the needle plate, the feed dog has a front end edge of a cloth pressing portion swingably supported by the cloth pressing member. (4) It is located rearward of the foremost position facing the window of the needle plate during the feeding movement, and a downward protrusion whose lower end surface is located below the upper surface of the needle plate is provided near the right side of the cloth retainer. The pressure force from above against is reduced, and the dependence point when turning the cloth is given, Is characterized in that it possible to centered around falling portion enhancing the turning performance of the fabric.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to the drawings. A horizontal support pin is provided on a presser holder 1 fixed to the lower end of a presser bar (not shown) supported on an arm machine frame of a sewing machine. The cloth pressing portion 3 is swingably supported via 2 and the cloth pressing portion is urged by the action of the spring 4 so that the tip thereof always rotates downward.

The cloth pressing portion 3 is formed with a needle drop portion 5 which is recessed from the right side edge, and a projection 6 which is projected downward is provided at the cloth feeding side opening of the recess. The lower end surface of the portion is located below the surface of the needle plate described later.

A needle plate 7 is fixed to the upper surface of the bed machine frame with a tightening screw, and a needle drop recess 8 is formed in the needle plate. The recess 8 is recessed to the left from the right side edge and faces the recess. An overhanging protrusion 9 is provided so that when the needle drop portion 5 of the cloth pressing portion 3 is lowered onto the needle plate 7, it is made to coincide with the needle drop recess 8.

The needle plate 7 is provided with a plurality of feed dog windows 10 which are long in the cloth feeding direction, and the feed teeth 11 are vertically movable from below in the windows so that four cloth feeding movements can be performed during cloth feeding. The cloth W placed on the upper surface of the needle plate 7 is moved backward from the front side.

The fixed blade 12 for cutting the cloth is fixed to the bed machine frame on the front side of the needle drop recess 8 and cuts the cloth W in cooperation with a movable blade (not shown).

Since the present invention has the above-mentioned structure, if the cloth W enters the lower side of the cloth pressing portion 3, the cloth W is fed back by the four feed motions of the feed dog 11, or the cloth pressing portion 3 is fed out backward. Since the contact length of the
Of the cloth operations performed by the operator, the cloth can be easily swung. Particularly, if the right side edge of the cloth is pressed against the side surface of the protrusion 6 of the cloth pressing portion, the cloth is swung remarkably easily.

Further, since the front end of the cloth pressing portion is located rearward of the front end of the movable range of the feed dog 11, the cloth is well bited when the cloth is inserted under the cloth pressing portion.

FIG. 4 is a plan view of an essential part of the present invention, and the auxiliary pressing structure and its function will be described with reference to FIG. 5 which is a sectional view taken along line BB. Reference numeral 4 is an auxiliary pressing spring, which is fixed to a hollow ring guide portion provided at the rear of the cloth pressing portion 3 by a screw 13. The auxiliary pressing spring 4 is formed of a plate-shaped spring member, and has a shape that hangs downward.

Therefore, when the bead member is sewn as in the present patent, the following effects are obtained. With respect to the size change of the bead member to be sewn, it is pressed downward by the bias of the spring member and cooperates with the lower auxiliary feed dog to smoothly feed the bead portion rearward. Further, although the bead portion is discontinuous in height, it similarly acts smoothly due to the spring action.

[0015]

[Effect] Since the present invention has the above-described structure and operation, in the sewing machine with a knife for cutting, the swivelability of the cloth is remarkably improved, and the operation of the overedging of the curved portion is facilitated, so that defective products are not generated It is intended to eliminate the factor that causes the reduction, and has a great industrial and practical effect.

[0016]

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a side view of a main portion of the present invention mounted on a sewing machine, FIG. 2 is a front view of the main portion of the present invention mounted on a sewing machine, and FIG. FIG. 4 is a plan view of an essential part of the present invention mounted on a sewing machine, FIG. 4 is an enlarged plan view of the essential part, and FIG. 5 is a sectional view taken along line BB in FIG. 3 ... Cloth pressing portion 5 ... Needle drop portion 6 ... Projection portion 7 ... Needle plate 8 ... Needle drop concave portion 11 ... Feed dog

Claims (1)

[Claims] The sewing machine frame is composed of an arm machine and a bed machine frame, and a cloth retainer detachably attached to a lower end of a presser bar supported by the arm machine frame, and a cloth presser which is attached to the bed machine frame and is long in the cloth feed direction. A needle plate having a plurality of windows and a needle drop recess which is recessed leftward from the right side edge parallel to the cloth feed direction, and a four-feed motion attached to the bed machine frame below the needle plate. In a sewing machine provided with a feed dog that is capable of moving and a tooth portion formed on the upper surface is periodically faced upward from the window portion of the needle plate, a cloth presser swingably supported by the cloth presser tool. The front end edge of the portion is located rearward of the front end position of the four feed motion range of the feed dog, and a downward protruding portion whose lower end surface is located below the upper surface of the needle plate is provided near the right side portion of the cloth pressing portion. Sewing machine presser foot characterized by that.